Version:  2.0.40 2.2.26 2.4.37 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17

Linux/drivers/tty/synclinkmp.c

  1 /*
  2  * $Id: synclinkmp.c,v 4.38 2005/07/15 13:29:44 paulkf Exp $
  3  *
  4  * Device driver for Microgate SyncLink Multiport
  5  * high speed multiprotocol serial adapter.
  6  *
  7  * written by Paul Fulghum for Microgate Corporation
  8  * paulkf@microgate.com
  9  *
 10  * Microgate and SyncLink are trademarks of Microgate Corporation
 11  *
 12  * Derived from serial.c written by Theodore Ts'o and Linus Torvalds
 13  * This code is released under the GNU General Public License (GPL)
 14  *
 15  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
 16  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 18  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
 19  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 20  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 21  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 23  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 24  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 25  * OF THE POSSIBILITY OF SUCH DAMAGE.
 26  */
 27 
 28 #define VERSION(ver,rel,seq) (((ver)<<16) | ((rel)<<8) | (seq))
 29 #if defined(__i386__)
 30 #  define BREAKPOINT() asm("   int $3");
 31 #else
 32 #  define BREAKPOINT() { }
 33 #endif
 34 
 35 #define MAX_DEVICES 12
 36 
 37 #include <linux/module.h>
 38 #include <linux/errno.h>
 39 #include <linux/signal.h>
 40 #include <linux/sched.h>
 41 #include <linux/timer.h>
 42 #include <linux/interrupt.h>
 43 #include <linux/pci.h>
 44 #include <linux/tty.h>
 45 #include <linux/tty_flip.h>
 46 #include <linux/serial.h>
 47 #include <linux/major.h>
 48 #include <linux/string.h>
 49 #include <linux/fcntl.h>
 50 #include <linux/ptrace.h>
 51 #include <linux/ioport.h>
 52 #include <linux/mm.h>
 53 #include <linux/seq_file.h>
 54 #include <linux/slab.h>
 55 #include <linux/netdevice.h>
 56 #include <linux/vmalloc.h>
 57 #include <linux/init.h>
 58 #include <linux/delay.h>
 59 #include <linux/ioctl.h>
 60 
 61 #include <asm/io.h>
 62 #include <asm/irq.h>
 63 #include <asm/dma.h>
 64 #include <linux/bitops.h>
 65 #include <asm/types.h>
 66 #include <linux/termios.h>
 67 #include <linux/workqueue.h>
 68 #include <linux/hdlc.h>
 69 #include <linux/synclink.h>
 70 
 71 #if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINKMP_MODULE))
 72 #define SYNCLINK_GENERIC_HDLC 1
 73 #else
 74 #define SYNCLINK_GENERIC_HDLC 0
 75 #endif
 76 
 77 #define GET_USER(error,value,addr) error = get_user(value,addr)
 78 #define COPY_FROM_USER(error,dest,src,size) error = copy_from_user(dest,src,size) ? -EFAULT : 0
 79 #define PUT_USER(error,value,addr) error = put_user(value,addr)
 80 #define COPY_TO_USER(error,dest,src,size) error = copy_to_user(dest,src,size) ? -EFAULT : 0
 81 
 82 #include <asm/uaccess.h>
 83 
 84 static MGSL_PARAMS default_params = {
 85         MGSL_MODE_HDLC,                 /* unsigned long mode */
 86         0,                              /* unsigned char loopback; */
 87         HDLC_FLAG_UNDERRUN_ABORT15,     /* unsigned short flags; */
 88         HDLC_ENCODING_NRZI_SPACE,       /* unsigned char encoding; */
 89         0,                              /* unsigned long clock_speed; */
 90         0xff,                           /* unsigned char addr_filter; */
 91         HDLC_CRC_16_CCITT,              /* unsigned short crc_type; */
 92         HDLC_PREAMBLE_LENGTH_8BITS,     /* unsigned char preamble_length; */
 93         HDLC_PREAMBLE_PATTERN_NONE,     /* unsigned char preamble; */
 94         9600,                           /* unsigned long data_rate; */
 95         8,                              /* unsigned char data_bits; */
 96         1,                              /* unsigned char stop_bits; */
 97         ASYNC_PARITY_NONE               /* unsigned char parity; */
 98 };
 99 
100 /* size in bytes of DMA data buffers */
101 #define SCABUFSIZE      1024
102 #define SCA_MEM_SIZE    0x40000
103 #define SCA_BASE_SIZE   512
104 #define SCA_REG_SIZE    16
105 #define SCA_MAX_PORTS   4
106 #define SCAMAXDESC      128
107 
108 #define BUFFERLISTSIZE  4096
109 
110 /* SCA-I style DMA buffer descriptor */
111 typedef struct _SCADESC
112 {
113         u16     next;           /* lower l6 bits of next descriptor addr */
114         u16     buf_ptr;        /* lower 16 bits of buffer addr */
115         u8      buf_base;       /* upper 8 bits of buffer addr */
116         u8      pad1;
117         u16     length;         /* length of buffer */
118         u8      status;         /* status of buffer */
119         u8      pad2;
120 } SCADESC, *PSCADESC;
121 
122 typedef struct _SCADESC_EX
123 {
124         /* device driver bookkeeping section */
125         char    *virt_addr;     /* virtual address of data buffer */
126         u16     phys_entry;     /* lower 16-bits of physical address of this descriptor */
127 } SCADESC_EX, *PSCADESC_EX;
128 
129 /* The queue of BH actions to be performed */
130 
131 #define BH_RECEIVE  1
132 #define BH_TRANSMIT 2
133 #define BH_STATUS   4
134 
135 #define IO_PIN_SHUTDOWN_LIMIT 100
136 
137 struct  _input_signal_events {
138         int     ri_up;
139         int     ri_down;
140         int     dsr_up;
141         int     dsr_down;
142         int     dcd_up;
143         int     dcd_down;
144         int     cts_up;
145         int     cts_down;
146 };
147 
148 /*
149  * Device instance data structure
150  */
151 typedef struct _synclinkmp_info {
152         void *if_ptr;                           /* General purpose pointer (used by SPPP) */
153         int                     magic;
154         struct tty_port         port;
155         int                     line;
156         unsigned short          close_delay;
157         unsigned short          closing_wait;   /* time to wait before closing */
158 
159         struct mgsl_icount      icount;
160 
161         int                     timeout;
162         int                     x_char;         /* xon/xoff character */
163         u16                     read_status_mask1;  /* break detection (SR1 indications) */
164         u16                     read_status_mask2;  /* parity/framing/overun (SR2 indications) */
165         unsigned char           ignore_status_mask1;  /* break detection (SR1 indications) */
166         unsigned char           ignore_status_mask2;  /* parity/framing/overun (SR2 indications) */
167         unsigned char           *tx_buf;
168         int                     tx_put;
169         int                     tx_get;
170         int                     tx_count;
171 
172         wait_queue_head_t       status_event_wait_q;
173         wait_queue_head_t       event_wait_q;
174         struct timer_list       tx_timer;       /* HDLC transmit timeout timer */
175         struct _synclinkmp_info *next_device;   /* device list link */
176         struct timer_list       status_timer;   /* input signal status check timer */
177 
178         spinlock_t lock;                /* spinlock for synchronizing with ISR */
179         struct work_struct task;                        /* task structure for scheduling bh */
180 
181         u32 max_frame_size;                     /* as set by device config */
182 
183         u32 pending_bh;
184 
185         bool bh_running;                                /* Protection from multiple */
186         int isr_overflow;
187         bool bh_requested;
188 
189         int dcd_chkcount;                       /* check counts to prevent */
190         int cts_chkcount;                       /* too many IRQs if a signal */
191         int dsr_chkcount;                       /* is floating */
192         int ri_chkcount;
193 
194         char *buffer_list;                      /* virtual address of Rx & Tx buffer lists */
195         unsigned long buffer_list_phys;
196 
197         unsigned int rx_buf_count;              /* count of total allocated Rx buffers */
198         SCADESC *rx_buf_list;                   /* list of receive buffer entries */
199         SCADESC_EX rx_buf_list_ex[SCAMAXDESC]; /* list of receive buffer entries */
200         unsigned int current_rx_buf;
201 
202         unsigned int tx_buf_count;              /* count of total allocated Tx buffers */
203         SCADESC *tx_buf_list;           /* list of transmit buffer entries */
204         SCADESC_EX tx_buf_list_ex[SCAMAXDESC]; /* list of transmit buffer entries */
205         unsigned int last_tx_buf;
206 
207         unsigned char *tmp_rx_buf;
208         unsigned int tmp_rx_buf_count;
209 
210         bool rx_enabled;
211         bool rx_overflow;
212 
213         bool tx_enabled;
214         bool tx_active;
215         u32 idle_mode;
216 
217         unsigned char ie0_value;
218         unsigned char ie1_value;
219         unsigned char ie2_value;
220         unsigned char ctrlreg_value;
221         unsigned char old_signals;
222 
223         char device_name[25];                   /* device instance name */
224 
225         int port_count;
226         int adapter_num;
227         int port_num;
228 
229         struct _synclinkmp_info *port_array[SCA_MAX_PORTS];
230 
231         unsigned int bus_type;                  /* expansion bus type (ISA,EISA,PCI) */
232 
233         unsigned int irq_level;                 /* interrupt level */
234         unsigned long irq_flags;
235         bool irq_requested;                     /* true if IRQ requested */
236 
237         MGSL_PARAMS params;                     /* communications parameters */
238 
239         unsigned char serial_signals;           /* current serial signal states */
240 
241         bool irq_occurred;                      /* for diagnostics use */
242         unsigned int init_error;                /* Initialization startup error */
243 
244         u32 last_mem_alloc;
245         unsigned char* memory_base;             /* shared memory address (PCI only) */
246         u32 phys_memory_base;
247         int shared_mem_requested;
248 
249         unsigned char* sca_base;                /* HD64570 SCA Memory address */
250         u32 phys_sca_base;
251         u32 sca_offset;
252         bool sca_base_requested;
253 
254         unsigned char* lcr_base;                /* local config registers (PCI only) */
255         u32 phys_lcr_base;
256         u32 lcr_offset;
257         int lcr_mem_requested;
258 
259         unsigned char* statctrl_base;           /* status/control register memory */
260         u32 phys_statctrl_base;
261         u32 statctrl_offset;
262         bool sca_statctrl_requested;
263 
264         u32 misc_ctrl_value;
265         char *flag_buf;
266         bool drop_rts_on_tx_done;
267 
268         struct  _input_signal_events    input_signal_events;
269 
270         /* SPPP/Cisco HDLC device parts */
271         int netcount;
272         spinlock_t netlock;
273 
274 #if SYNCLINK_GENERIC_HDLC
275         struct net_device *netdev;
276 #endif
277 
278 } SLMP_INFO;
279 
280 #define MGSL_MAGIC 0x5401
281 
282 /*
283  * define serial signal status change macros
284  */
285 #define MISCSTATUS_DCD_LATCHED  (SerialSignal_DCD<<8)   /* indicates change in DCD */
286 #define MISCSTATUS_RI_LATCHED   (SerialSignal_RI<<8)    /* indicates change in RI */
287 #define MISCSTATUS_CTS_LATCHED  (SerialSignal_CTS<<8)   /* indicates change in CTS */
288 #define MISCSTATUS_DSR_LATCHED  (SerialSignal_DSR<<8)   /* change in DSR */
289 
290 /* Common Register macros */
291 #define LPR     0x00
292 #define PABR0   0x02
293 #define PABR1   0x03
294 #define WCRL    0x04
295 #define WCRM    0x05
296 #define WCRH    0x06
297 #define DPCR    0x08
298 #define DMER    0x09
299 #define ISR0    0x10
300 #define ISR1    0x11
301 #define ISR2    0x12
302 #define IER0    0x14
303 #define IER1    0x15
304 #define IER2    0x16
305 #define ITCR    0x18
306 #define INTVR   0x1a
307 #define IMVR    0x1c
308 
309 /* MSCI Register macros */
310 #define TRB     0x20
311 #define TRBL    0x20
312 #define TRBH    0x21
313 #define SR0     0x22
314 #define SR1     0x23
315 #define SR2     0x24
316 #define SR3     0x25
317 #define FST     0x26
318 #define IE0     0x28
319 #define IE1     0x29
320 #define IE2     0x2a
321 #define FIE     0x2b
322 #define CMD     0x2c
323 #define MD0     0x2e
324 #define MD1     0x2f
325 #define MD2     0x30
326 #define CTL     0x31
327 #define SA0     0x32
328 #define SA1     0x33
329 #define IDL     0x34
330 #define TMC     0x35
331 #define RXS     0x36
332 #define TXS     0x37
333 #define TRC0    0x38
334 #define TRC1    0x39
335 #define RRC     0x3a
336 #define CST0    0x3c
337 #define CST1    0x3d
338 
339 /* Timer Register Macros */
340 #define TCNT    0x60
341 #define TCNTL   0x60
342 #define TCNTH   0x61
343 #define TCONR   0x62
344 #define TCONRL  0x62
345 #define TCONRH  0x63
346 #define TMCS    0x64
347 #define TEPR    0x65
348 
349 /* DMA Controller Register macros */
350 #define DARL    0x80
351 #define DARH    0x81
352 #define DARB    0x82
353 #define BAR     0x80
354 #define BARL    0x80
355 #define BARH    0x81
356 #define BARB    0x82
357 #define SAR     0x84
358 #define SARL    0x84
359 #define SARH    0x85
360 #define SARB    0x86
361 #define CPB     0x86
362 #define CDA     0x88
363 #define CDAL    0x88
364 #define CDAH    0x89
365 #define EDA     0x8a
366 #define EDAL    0x8a
367 #define EDAH    0x8b
368 #define BFL     0x8c
369 #define BFLL    0x8c
370 #define BFLH    0x8d
371 #define BCR     0x8e
372 #define BCRL    0x8e
373 #define BCRH    0x8f
374 #define DSR     0x90
375 #define DMR     0x91
376 #define FCT     0x93
377 #define DIR     0x94
378 #define DCMD    0x95
379 
380 /* combine with timer or DMA register address */
381 #define TIMER0  0x00
382 #define TIMER1  0x08
383 #define TIMER2  0x10
384 #define TIMER3  0x18
385 #define RXDMA   0x00
386 #define TXDMA   0x20
387 
388 /* SCA Command Codes */
389 #define NOOP            0x00
390 #define TXRESET         0x01
391 #define TXENABLE        0x02
392 #define TXDISABLE       0x03
393 #define TXCRCINIT       0x04
394 #define TXCRCEXCL       0x05
395 #define TXEOM           0x06
396 #define TXABORT         0x07
397 #define MPON            0x08
398 #define TXBUFCLR        0x09
399 #define RXRESET         0x11
400 #define RXENABLE        0x12
401 #define RXDISABLE       0x13
402 #define RXCRCINIT       0x14
403 #define RXREJECT        0x15
404 #define SEARCHMP        0x16
405 #define RXCRCEXCL       0x17
406 #define RXCRCCALC       0x18
407 #define CHRESET         0x21
408 #define HUNT            0x31
409 
410 /* DMA command codes */
411 #define SWABORT         0x01
412 #define FEICLEAR        0x02
413 
414 /* IE0 */
415 #define TXINTE          BIT7
416 #define RXINTE          BIT6
417 #define TXRDYE          BIT1
418 #define RXRDYE          BIT0
419 
420 /* IE1 & SR1 */
421 #define UDRN    BIT7
422 #define IDLE    BIT6
423 #define SYNCD   BIT4
424 #define FLGD    BIT4
425 #define CCTS    BIT3
426 #define CDCD    BIT2
427 #define BRKD    BIT1
428 #define ABTD    BIT1
429 #define GAPD    BIT1
430 #define BRKE    BIT0
431 #define IDLD    BIT0
432 
433 /* IE2 & SR2 */
434 #define EOM     BIT7
435 #define PMP     BIT6
436 #define SHRT    BIT6
437 #define PE      BIT5
438 #define ABT     BIT5
439 #define FRME    BIT4
440 #define RBIT    BIT4
441 #define OVRN    BIT3
442 #define CRCE    BIT2
443 
444 
445 /*
446  * Global linked list of SyncLink devices
447  */
448 static SLMP_INFO *synclinkmp_device_list = NULL;
449 static int synclinkmp_adapter_count = -1;
450 static int synclinkmp_device_count = 0;
451 
452 /*
453  * Set this param to non-zero to load eax with the
454  * .text section address and breakpoint on module load.
455  * This is useful for use with gdb and add-symbol-file command.
456  */
457 static bool break_on_load = 0;
458 
459 /*
460  * Driver major number, defaults to zero to get auto
461  * assigned major number. May be forced as module parameter.
462  */
463 static int ttymajor = 0;
464 
465 /*
466  * Array of user specified options for ISA adapters.
467  */
468 static int debug_level = 0;
469 static int maxframe[MAX_DEVICES] = {0,};
470 
471 module_param(break_on_load, bool, 0);
472 module_param(ttymajor, int, 0);
473 module_param(debug_level, int, 0);
474 module_param_array(maxframe, int, NULL, 0);
475 
476 static char *driver_name = "SyncLink MultiPort driver";
477 static char *driver_version = "$Revision: 4.38 $";
478 
479 static int synclinkmp_init_one(struct pci_dev *dev,const struct pci_device_id *ent);
480 static void synclinkmp_remove_one(struct pci_dev *dev);
481 
482 static struct pci_device_id synclinkmp_pci_tbl[] = {
483         { PCI_VENDOR_ID_MICROGATE, PCI_DEVICE_ID_MICROGATE_SCA, PCI_ANY_ID, PCI_ANY_ID, },
484         { 0, }, /* terminate list */
485 };
486 MODULE_DEVICE_TABLE(pci, synclinkmp_pci_tbl);
487 
488 MODULE_LICENSE("GPL");
489 
490 static struct pci_driver synclinkmp_pci_driver = {
491         .name           = "synclinkmp",
492         .id_table       = synclinkmp_pci_tbl,
493         .probe          = synclinkmp_init_one,
494         .remove         = synclinkmp_remove_one,
495 };
496 
497 
498 static struct tty_driver *serial_driver;
499 
500 /* number of characters left in xmit buffer before we ask for more */
501 #define WAKEUP_CHARS 256
502 
503 
504 /* tty callbacks */
505 
506 static int  open(struct tty_struct *tty, struct file * filp);
507 static void close(struct tty_struct *tty, struct file * filp);
508 static void hangup(struct tty_struct *tty);
509 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios);
510 
511 static int  write(struct tty_struct *tty, const unsigned char *buf, int count);
512 static int put_char(struct tty_struct *tty, unsigned char ch);
513 static void send_xchar(struct tty_struct *tty, char ch);
514 static void wait_until_sent(struct tty_struct *tty, int timeout);
515 static int  write_room(struct tty_struct *tty);
516 static void flush_chars(struct tty_struct *tty);
517 static void flush_buffer(struct tty_struct *tty);
518 static void tx_hold(struct tty_struct *tty);
519 static void tx_release(struct tty_struct *tty);
520 
521 static int  ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg);
522 static int  chars_in_buffer(struct tty_struct *tty);
523 static void throttle(struct tty_struct * tty);
524 static void unthrottle(struct tty_struct * tty);
525 static int set_break(struct tty_struct *tty, int break_state);
526 
527 #if SYNCLINK_GENERIC_HDLC
528 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
529 static void hdlcdev_tx_done(SLMP_INFO *info);
530 static void hdlcdev_rx(SLMP_INFO *info, char *buf, int size);
531 static int  hdlcdev_init(SLMP_INFO *info);
532 static void hdlcdev_exit(SLMP_INFO *info);
533 #endif
534 
535 /* ioctl handlers */
536 
537 static int  get_stats(SLMP_INFO *info, struct mgsl_icount __user *user_icount);
538 static int  get_params(SLMP_INFO *info, MGSL_PARAMS __user *params);
539 static int  set_params(SLMP_INFO *info, MGSL_PARAMS __user *params);
540 static int  get_txidle(SLMP_INFO *info, int __user *idle_mode);
541 static int  set_txidle(SLMP_INFO *info, int idle_mode);
542 static int  tx_enable(SLMP_INFO *info, int enable);
543 static int  tx_abort(SLMP_INFO *info);
544 static int  rx_enable(SLMP_INFO *info, int enable);
545 static int  modem_input_wait(SLMP_INFO *info,int arg);
546 static int  wait_mgsl_event(SLMP_INFO *info, int __user *mask_ptr);
547 static int  tiocmget(struct tty_struct *tty);
548 static int  tiocmset(struct tty_struct *tty,
549                         unsigned int set, unsigned int clear);
550 static int  set_break(struct tty_struct *tty, int break_state);
551 
552 static void add_device(SLMP_INFO *info);
553 static void device_init(int adapter_num, struct pci_dev *pdev);
554 static int  claim_resources(SLMP_INFO *info);
555 static void release_resources(SLMP_INFO *info);
556 
557 static int  startup(SLMP_INFO *info);
558 static int  block_til_ready(struct tty_struct *tty, struct file * filp,SLMP_INFO *info);
559 static int carrier_raised(struct tty_port *port);
560 static void shutdown(SLMP_INFO *info);
561 static void program_hw(SLMP_INFO *info);
562 static void change_params(SLMP_INFO *info);
563 
564 static bool init_adapter(SLMP_INFO *info);
565 static bool register_test(SLMP_INFO *info);
566 static bool irq_test(SLMP_INFO *info);
567 static bool loopback_test(SLMP_INFO *info);
568 static int  adapter_test(SLMP_INFO *info);
569 static bool memory_test(SLMP_INFO *info);
570 
571 static void reset_adapter(SLMP_INFO *info);
572 static void reset_port(SLMP_INFO *info);
573 static void async_mode(SLMP_INFO *info);
574 static void hdlc_mode(SLMP_INFO *info);
575 
576 static void rx_stop(SLMP_INFO *info);
577 static void rx_start(SLMP_INFO *info);
578 static void rx_reset_buffers(SLMP_INFO *info);
579 static void rx_free_frame_buffers(SLMP_INFO *info, unsigned int first, unsigned int last);
580 static bool rx_get_frame(SLMP_INFO *info);
581 
582 static void tx_start(SLMP_INFO *info);
583 static void tx_stop(SLMP_INFO *info);
584 static void tx_load_fifo(SLMP_INFO *info);
585 static void tx_set_idle(SLMP_INFO *info);
586 static void tx_load_dma_buffer(SLMP_INFO *info, const char *buf, unsigned int count);
587 
588 static void get_signals(SLMP_INFO *info);
589 static void set_signals(SLMP_INFO *info);
590 static void enable_loopback(SLMP_INFO *info, int enable);
591 static void set_rate(SLMP_INFO *info, u32 data_rate);
592 
593 static int  bh_action(SLMP_INFO *info);
594 static void bh_handler(struct work_struct *work);
595 static void bh_receive(SLMP_INFO *info);
596 static void bh_transmit(SLMP_INFO *info);
597 static void bh_status(SLMP_INFO *info);
598 static void isr_timer(SLMP_INFO *info);
599 static void isr_rxint(SLMP_INFO *info);
600 static void isr_rxrdy(SLMP_INFO *info);
601 static void isr_txint(SLMP_INFO *info);
602 static void isr_txrdy(SLMP_INFO *info);
603 static void isr_rxdmaok(SLMP_INFO *info);
604 static void isr_rxdmaerror(SLMP_INFO *info);
605 static void isr_txdmaok(SLMP_INFO *info);
606 static void isr_txdmaerror(SLMP_INFO *info);
607 static void isr_io_pin(SLMP_INFO *info, u16 status);
608 
609 static int  alloc_dma_bufs(SLMP_INFO *info);
610 static void free_dma_bufs(SLMP_INFO *info);
611 static int  alloc_buf_list(SLMP_INFO *info);
612 static int  alloc_frame_bufs(SLMP_INFO *info, SCADESC *list, SCADESC_EX *list_ex,int count);
613 static int  alloc_tmp_rx_buf(SLMP_INFO *info);
614 static void free_tmp_rx_buf(SLMP_INFO *info);
615 
616 static void load_pci_memory(SLMP_INFO *info, char* dest, const char* src, unsigned short count);
617 static void trace_block(SLMP_INFO *info, const char* data, int count, int xmit);
618 static void tx_timeout(unsigned long context);
619 static void status_timeout(unsigned long context);
620 
621 static unsigned char read_reg(SLMP_INFO *info, unsigned char addr);
622 static void write_reg(SLMP_INFO *info, unsigned char addr, unsigned char val);
623 static u16 read_reg16(SLMP_INFO *info, unsigned char addr);
624 static void write_reg16(SLMP_INFO *info, unsigned char addr, u16 val);
625 static unsigned char read_status_reg(SLMP_INFO * info);
626 static void write_control_reg(SLMP_INFO * info);
627 
628 
629 static unsigned char rx_active_fifo_level = 16; // rx request FIFO activation level in bytes
630 static unsigned char tx_active_fifo_level = 16; // tx request FIFO activation level in bytes
631 static unsigned char tx_negate_fifo_level = 32; // tx request FIFO negation level in bytes
632 
633 static u32 misc_ctrl_value = 0x007e4040;
634 static u32 lcr1_brdr_value = 0x00800028;
635 
636 static u32 read_ahead_count = 8;
637 
638 /* DPCR, DMA Priority Control
639  *
640  * 07..05  Not used, must be 0
641  * 04      BRC, bus release condition: 0=all transfers complete
642  *              1=release after 1 xfer on all channels
643  * 03      CCC, channel change condition: 0=every cycle
644  *              1=after each channel completes all xfers
645  * 02..00  PR<2..0>, priority 100=round robin
646  *
647  * 00000100 = 0x00
648  */
649 static unsigned char dma_priority = 0x04;
650 
651 // Number of bytes that can be written to shared RAM
652 // in a single write operation
653 static u32 sca_pci_load_interval = 64;
654 
655 /*
656  * 1st function defined in .text section. Calling this function in
657  * init_module() followed by a breakpoint allows a remote debugger
658  * (gdb) to get the .text address for the add-symbol-file command.
659  * This allows remote debugging of dynamically loadable modules.
660  */
661 static void* synclinkmp_get_text_ptr(void);
662 static void* synclinkmp_get_text_ptr(void) {return synclinkmp_get_text_ptr;}
663 
664 static inline int sanity_check(SLMP_INFO *info,
665                                char *name, const char *routine)
666 {
667 #ifdef SANITY_CHECK
668         static const char *badmagic =
669                 "Warning: bad magic number for synclinkmp_struct (%s) in %s\n";
670         static const char *badinfo =
671                 "Warning: null synclinkmp_struct for (%s) in %s\n";
672 
673         if (!info) {
674                 printk(badinfo, name, routine);
675                 return 1;
676         }
677         if (info->magic != MGSL_MAGIC) {
678                 printk(badmagic, name, routine);
679                 return 1;
680         }
681 #else
682         if (!info)
683                 return 1;
684 #endif
685         return 0;
686 }
687 
688 /**
689  * line discipline callback wrappers
690  *
691  * The wrappers maintain line discipline references
692  * while calling into the line discipline.
693  *
694  * ldisc_receive_buf  - pass receive data to line discipline
695  */
696 
697 static void ldisc_receive_buf(struct tty_struct *tty,
698                               const __u8 *data, char *flags, int count)
699 {
700         struct tty_ldisc *ld;
701         if (!tty)
702                 return;
703         ld = tty_ldisc_ref(tty);
704         if (ld) {
705                 if (ld->ops->receive_buf)
706                         ld->ops->receive_buf(tty, data, flags, count);
707                 tty_ldisc_deref(ld);
708         }
709 }
710 
711 /* tty callbacks */
712 
713 static int install(struct tty_driver *driver, struct tty_struct *tty)
714 {
715         SLMP_INFO *info;
716         int line = tty->index;
717 
718         if (line >= synclinkmp_device_count) {
719                 printk("%s(%d): open with invalid line #%d.\n",
720                         __FILE__,__LINE__,line);
721                 return -ENODEV;
722         }
723 
724         info = synclinkmp_device_list;
725         while (info && info->line != line)
726                 info = info->next_device;
727         if (sanity_check(info, tty->name, "open"))
728                 return -ENODEV;
729         if (info->init_error) {
730                 printk("%s(%d):%s device is not allocated, init error=%d\n",
731                         __FILE__, __LINE__, info->device_name,
732                         info->init_error);
733                 return -ENODEV;
734         }
735 
736         tty->driver_data = info;
737 
738         return tty_port_install(&info->port, driver, tty);
739 }
740 
741 /* Called when a port is opened.  Init and enable port.
742  */
743 static int open(struct tty_struct *tty, struct file *filp)
744 {
745         SLMP_INFO *info = tty->driver_data;
746         unsigned long flags;
747         int retval;
748 
749         info->port.tty = tty;
750 
751         if (debug_level >= DEBUG_LEVEL_INFO)
752                 printk("%s(%d):%s open(), old ref count = %d\n",
753                          __FILE__,__LINE__,tty->driver->name, info->port.count);
754 
755         /* If port is closing, signal caller to try again */
756         if (info->port.flags & ASYNC_CLOSING){
757                 wait_event_interruptible_tty(tty, info->port.close_wait,
758                                              !(info->port.flags & ASYNC_CLOSING));
759                 retval = ((info->port.flags & ASYNC_HUP_NOTIFY) ?
760                         -EAGAIN : -ERESTARTSYS);
761                 goto cleanup;
762         }
763 
764         info->port.low_latency = (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
765 
766         spin_lock_irqsave(&info->netlock, flags);
767         if (info->netcount) {
768                 retval = -EBUSY;
769                 spin_unlock_irqrestore(&info->netlock, flags);
770                 goto cleanup;
771         }
772         info->port.count++;
773         spin_unlock_irqrestore(&info->netlock, flags);
774 
775         if (info->port.count == 1) {
776                 /* 1st open on this device, init hardware */
777                 retval = startup(info);
778                 if (retval < 0)
779                         goto cleanup;
780         }
781 
782         retval = block_til_ready(tty, filp, info);
783         if (retval) {
784                 if (debug_level >= DEBUG_LEVEL_INFO)
785                         printk("%s(%d):%s block_til_ready() returned %d\n",
786                                  __FILE__,__LINE__, info->device_name, retval);
787                 goto cleanup;
788         }
789 
790         if (debug_level >= DEBUG_LEVEL_INFO)
791                 printk("%s(%d):%s open() success\n",
792                          __FILE__,__LINE__, info->device_name);
793         retval = 0;
794 
795 cleanup:
796         if (retval) {
797                 if (tty->count == 1)
798                         info->port.tty = NULL; /* tty layer will release tty struct */
799                 if(info->port.count)
800                         info->port.count--;
801         }
802 
803         return retval;
804 }
805 
806 /* Called when port is closed. Wait for remaining data to be
807  * sent. Disable port and free resources.
808  */
809 static void close(struct tty_struct *tty, struct file *filp)
810 {
811         SLMP_INFO * info = tty->driver_data;
812 
813         if (sanity_check(info, tty->name, "close"))
814                 return;
815 
816         if (debug_level >= DEBUG_LEVEL_INFO)
817                 printk("%s(%d):%s close() entry, count=%d\n",
818                          __FILE__,__LINE__, info->device_name, info->port.count);
819 
820         if (tty_port_close_start(&info->port, tty, filp) == 0)
821                 goto cleanup;
822 
823         mutex_lock(&info->port.mutex);
824         if (info->port.flags & ASYNC_INITIALIZED)
825                 wait_until_sent(tty, info->timeout);
826 
827         flush_buffer(tty);
828         tty_ldisc_flush(tty);
829         shutdown(info);
830         mutex_unlock(&info->port.mutex);
831 
832         tty_port_close_end(&info->port, tty);
833         info->port.tty = NULL;
834 cleanup:
835         if (debug_level >= DEBUG_LEVEL_INFO)
836                 printk("%s(%d):%s close() exit, count=%d\n", __FILE__,__LINE__,
837                         tty->driver->name, info->port.count);
838 }
839 
840 /* Called by tty_hangup() when a hangup is signaled.
841  * This is the same as closing all open descriptors for the port.
842  */
843 static void hangup(struct tty_struct *tty)
844 {
845         SLMP_INFO *info = tty->driver_data;
846         unsigned long flags;
847 
848         if (debug_level >= DEBUG_LEVEL_INFO)
849                 printk("%s(%d):%s hangup()\n",
850                          __FILE__,__LINE__, info->device_name );
851 
852         if (sanity_check(info, tty->name, "hangup"))
853                 return;
854 
855         mutex_lock(&info->port.mutex);
856         flush_buffer(tty);
857         shutdown(info);
858 
859         spin_lock_irqsave(&info->port.lock, flags);
860         info->port.count = 0;
861         info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
862         info->port.tty = NULL;
863         spin_unlock_irqrestore(&info->port.lock, flags);
864         mutex_unlock(&info->port.mutex);
865 
866         wake_up_interruptible(&info->port.open_wait);
867 }
868 
869 /* Set new termios settings
870  */
871 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios)
872 {
873         SLMP_INFO *info = tty->driver_data;
874         unsigned long flags;
875 
876         if (debug_level >= DEBUG_LEVEL_INFO)
877                 printk("%s(%d):%s set_termios()\n", __FILE__,__LINE__,
878                         tty->driver->name );
879 
880         change_params(info);
881 
882         /* Handle transition to B0 status */
883         if (old_termios->c_cflag & CBAUD &&
884             !(tty->termios.c_cflag & CBAUD)) {
885                 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
886                 spin_lock_irqsave(&info->lock,flags);
887                 set_signals(info);
888                 spin_unlock_irqrestore(&info->lock,flags);
889         }
890 
891         /* Handle transition away from B0 status */
892         if (!(old_termios->c_cflag & CBAUD) &&
893             tty->termios.c_cflag & CBAUD) {
894                 info->serial_signals |= SerialSignal_DTR;
895                 if (!(tty->termios.c_cflag & CRTSCTS) ||
896                     !test_bit(TTY_THROTTLED, &tty->flags)) {
897                         info->serial_signals |= SerialSignal_RTS;
898                 }
899                 spin_lock_irqsave(&info->lock,flags);
900                 set_signals(info);
901                 spin_unlock_irqrestore(&info->lock,flags);
902         }
903 
904         /* Handle turning off CRTSCTS */
905         if (old_termios->c_cflag & CRTSCTS &&
906             !(tty->termios.c_cflag & CRTSCTS)) {
907                 tty->hw_stopped = 0;
908                 tx_release(tty);
909         }
910 }
911 
912 /* Send a block of data
913  *
914  * Arguments:
915  *
916  *      tty             pointer to tty information structure
917  *      buf             pointer to buffer containing send data
918  *      count           size of send data in bytes
919  *
920  * Return Value:        number of characters written
921  */
922 static int write(struct tty_struct *tty,
923                  const unsigned char *buf, int count)
924 {
925         int     c, ret = 0;
926         SLMP_INFO *info = tty->driver_data;
927         unsigned long flags;
928 
929         if (debug_level >= DEBUG_LEVEL_INFO)
930                 printk("%s(%d):%s write() count=%d\n",
931                        __FILE__,__LINE__,info->device_name,count);
932 
933         if (sanity_check(info, tty->name, "write"))
934                 goto cleanup;
935 
936         if (!info->tx_buf)
937                 goto cleanup;
938 
939         if (info->params.mode == MGSL_MODE_HDLC) {
940                 if (count > info->max_frame_size) {
941                         ret = -EIO;
942                         goto cleanup;
943                 }
944                 if (info->tx_active)
945                         goto cleanup;
946                 if (info->tx_count) {
947                         /* send accumulated data from send_char() calls */
948                         /* as frame and wait before accepting more data. */
949                         tx_load_dma_buffer(info, info->tx_buf, info->tx_count);
950                         goto start;
951                 }
952                 ret = info->tx_count = count;
953                 tx_load_dma_buffer(info, buf, count);
954                 goto start;
955         }
956 
957         for (;;) {
958                 c = min_t(int, count,
959                         min(info->max_frame_size - info->tx_count - 1,
960                             info->max_frame_size - info->tx_put));
961                 if (c <= 0)
962                         break;
963                         
964                 memcpy(info->tx_buf + info->tx_put, buf, c);
965 
966                 spin_lock_irqsave(&info->lock,flags);
967                 info->tx_put += c;
968                 if (info->tx_put >= info->max_frame_size)
969                         info->tx_put -= info->max_frame_size;
970                 info->tx_count += c;
971                 spin_unlock_irqrestore(&info->lock,flags);
972 
973                 buf += c;
974                 count -= c;
975                 ret += c;
976         }
977 
978         if (info->params.mode == MGSL_MODE_HDLC) {
979                 if (count) {
980                         ret = info->tx_count = 0;
981                         goto cleanup;
982                 }
983                 tx_load_dma_buffer(info, info->tx_buf, info->tx_count);
984         }
985 start:
986         if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
987                 spin_lock_irqsave(&info->lock,flags);
988                 if (!info->tx_active)
989                         tx_start(info);
990                 spin_unlock_irqrestore(&info->lock,flags);
991         }
992 
993 cleanup:
994         if (debug_level >= DEBUG_LEVEL_INFO)
995                 printk( "%s(%d):%s write() returning=%d\n",
996                         __FILE__,__LINE__,info->device_name,ret);
997         return ret;
998 }
999 
1000 /* Add a character to the transmit buffer.
1001  */
1002 static int put_char(struct tty_struct *tty, unsigned char ch)
1003 {
1004         SLMP_INFO *info = tty->driver_data;
1005         unsigned long flags;
1006         int ret = 0;
1007 
1008         if ( debug_level >= DEBUG_LEVEL_INFO ) {
1009                 printk( "%s(%d):%s put_char(%d)\n",
1010                         __FILE__,__LINE__,info->device_name,ch);
1011         }
1012 
1013         if (sanity_check(info, tty->name, "put_char"))
1014                 return 0;
1015 
1016         if (!info->tx_buf)
1017                 return 0;
1018 
1019         spin_lock_irqsave(&info->lock,flags);
1020 
1021         if ( (info->params.mode != MGSL_MODE_HDLC) ||
1022              !info->tx_active ) {
1023 
1024                 if (info->tx_count < info->max_frame_size - 1) {
1025                         info->tx_buf[info->tx_put++] = ch;
1026                         if (info->tx_put >= info->max_frame_size)
1027                                 info->tx_put -= info->max_frame_size;
1028                         info->tx_count++;
1029                         ret = 1;
1030                 }
1031         }
1032 
1033         spin_unlock_irqrestore(&info->lock,flags);
1034         return ret;
1035 }
1036 
1037 /* Send a high-priority XON/XOFF character
1038  */
1039 static void send_xchar(struct tty_struct *tty, char ch)
1040 {
1041         SLMP_INFO *info = tty->driver_data;
1042         unsigned long flags;
1043 
1044         if (debug_level >= DEBUG_LEVEL_INFO)
1045                 printk("%s(%d):%s send_xchar(%d)\n",
1046                          __FILE__,__LINE__, info->device_name, ch );
1047 
1048         if (sanity_check(info, tty->name, "send_xchar"))
1049                 return;
1050 
1051         info->x_char = ch;
1052         if (ch) {
1053                 /* Make sure transmit interrupts are on */
1054                 spin_lock_irqsave(&info->lock,flags);
1055                 if (!info->tx_enabled)
1056                         tx_start(info);
1057                 spin_unlock_irqrestore(&info->lock,flags);
1058         }
1059 }
1060 
1061 /* Wait until the transmitter is empty.
1062  */
1063 static void wait_until_sent(struct tty_struct *tty, int timeout)
1064 {
1065         SLMP_INFO * info = tty->driver_data;
1066         unsigned long orig_jiffies, char_time;
1067 
1068         if (!info )
1069                 return;
1070 
1071         if (debug_level >= DEBUG_LEVEL_INFO)
1072                 printk("%s(%d):%s wait_until_sent() entry\n",
1073                          __FILE__,__LINE__, info->device_name );
1074 
1075         if (sanity_check(info, tty->name, "wait_until_sent"))
1076                 return;
1077 
1078         if (!test_bit(ASYNCB_INITIALIZED, &info->port.flags))
1079                 goto exit;
1080 
1081         orig_jiffies = jiffies;
1082 
1083         /* Set check interval to 1/5 of estimated time to
1084          * send a character, and make it at least 1. The check
1085          * interval should also be less than the timeout.
1086          * Note: use tight timings here to satisfy the NIST-PCTS.
1087          */
1088 
1089         if ( info->params.data_rate ) {
1090                 char_time = info->timeout/(32 * 5);
1091                 if (!char_time)
1092                         char_time++;
1093         } else
1094                 char_time = 1;
1095 
1096         if (timeout)
1097                 char_time = min_t(unsigned long, char_time, timeout);
1098 
1099         if ( info->params.mode == MGSL_MODE_HDLC ) {
1100                 while (info->tx_active) {
1101                         msleep_interruptible(jiffies_to_msecs(char_time));
1102                         if (signal_pending(current))
1103                                 break;
1104                         if (timeout && time_after(jiffies, orig_jiffies + timeout))
1105                                 break;
1106                 }
1107         } else {
1108                 /*
1109                  * TODO: determine if there is something similar to USC16C32
1110                  *       TXSTATUS_ALL_SENT status
1111                  */
1112                 while ( info->tx_active && info->tx_enabled) {
1113                         msleep_interruptible(jiffies_to_msecs(char_time));
1114                         if (signal_pending(current))
1115                                 break;
1116                         if (timeout && time_after(jiffies, orig_jiffies + timeout))
1117                                 break;
1118                 }
1119         }
1120 
1121 exit:
1122         if (debug_level >= DEBUG_LEVEL_INFO)
1123                 printk("%s(%d):%s wait_until_sent() exit\n",
1124                          __FILE__,__LINE__, info->device_name );
1125 }
1126 
1127 /* Return the count of free bytes in transmit buffer
1128  */
1129 static int write_room(struct tty_struct *tty)
1130 {
1131         SLMP_INFO *info = tty->driver_data;
1132         int ret;
1133 
1134         if (sanity_check(info, tty->name, "write_room"))
1135                 return 0;
1136 
1137         if (info->params.mode == MGSL_MODE_HDLC) {
1138                 ret = (info->tx_active) ? 0 : HDLC_MAX_FRAME_SIZE;
1139         } else {
1140                 ret = info->max_frame_size - info->tx_count - 1;
1141                 if (ret < 0)
1142                         ret = 0;
1143         }
1144 
1145         if (debug_level >= DEBUG_LEVEL_INFO)
1146                 printk("%s(%d):%s write_room()=%d\n",
1147                        __FILE__, __LINE__, info->device_name, ret);
1148 
1149         return ret;
1150 }
1151 
1152 /* enable transmitter and send remaining buffered characters
1153  */
1154 static void flush_chars(struct tty_struct *tty)
1155 {
1156         SLMP_INFO *info = tty->driver_data;
1157         unsigned long flags;
1158 
1159         if ( debug_level >= DEBUG_LEVEL_INFO )
1160                 printk( "%s(%d):%s flush_chars() entry tx_count=%d\n",
1161                         __FILE__,__LINE__,info->device_name,info->tx_count);
1162 
1163         if (sanity_check(info, tty->name, "flush_chars"))
1164                 return;
1165 
1166         if (info->tx_count <= 0 || tty->stopped || tty->hw_stopped ||
1167             !info->tx_buf)
1168                 return;
1169 
1170         if ( debug_level >= DEBUG_LEVEL_INFO )
1171                 printk( "%s(%d):%s flush_chars() entry, starting transmitter\n",
1172                         __FILE__,__LINE__,info->device_name );
1173 
1174         spin_lock_irqsave(&info->lock,flags);
1175 
1176         if (!info->tx_active) {
1177                 if ( (info->params.mode == MGSL_MODE_HDLC) &&
1178                         info->tx_count ) {
1179                         /* operating in synchronous (frame oriented) mode */
1180                         /* copy data from circular tx_buf to */
1181                         /* transmit DMA buffer. */
1182                         tx_load_dma_buffer(info,
1183                                  info->tx_buf,info->tx_count);
1184                 }
1185                 tx_start(info);
1186         }
1187 
1188         spin_unlock_irqrestore(&info->lock,flags);
1189 }
1190 
1191 /* Discard all data in the send buffer
1192  */
1193 static void flush_buffer(struct tty_struct *tty)
1194 {
1195         SLMP_INFO *info = tty->driver_data;
1196         unsigned long flags;
1197 
1198         if (debug_level >= DEBUG_LEVEL_INFO)
1199                 printk("%s(%d):%s flush_buffer() entry\n",
1200                          __FILE__,__LINE__, info->device_name );
1201 
1202         if (sanity_check(info, tty->name, "flush_buffer"))
1203                 return;
1204 
1205         spin_lock_irqsave(&info->lock,flags);
1206         info->tx_count = info->tx_put = info->tx_get = 0;
1207         del_timer(&info->tx_timer);
1208         spin_unlock_irqrestore(&info->lock,flags);
1209 
1210         tty_wakeup(tty);
1211 }
1212 
1213 /* throttle (stop) transmitter
1214  */
1215 static void tx_hold(struct tty_struct *tty)
1216 {
1217         SLMP_INFO *info = tty->driver_data;
1218         unsigned long flags;
1219 
1220         if (sanity_check(info, tty->name, "tx_hold"))
1221                 return;
1222 
1223         if ( debug_level >= DEBUG_LEVEL_INFO )
1224                 printk("%s(%d):%s tx_hold()\n",
1225                         __FILE__,__LINE__,info->device_name);
1226 
1227         spin_lock_irqsave(&info->lock,flags);
1228         if (info->tx_enabled)
1229                 tx_stop(info);
1230         spin_unlock_irqrestore(&info->lock,flags);
1231 }
1232 
1233 /* release (start) transmitter
1234  */
1235 static void tx_release(struct tty_struct *tty)
1236 {
1237         SLMP_INFO *info = tty->driver_data;
1238         unsigned long flags;
1239 
1240         if (sanity_check(info, tty->name, "tx_release"))
1241                 return;
1242 
1243         if ( debug_level >= DEBUG_LEVEL_INFO )
1244                 printk("%s(%d):%s tx_release()\n",
1245                         __FILE__,__LINE__,info->device_name);
1246 
1247         spin_lock_irqsave(&info->lock,flags);
1248         if (!info->tx_enabled)
1249                 tx_start(info);
1250         spin_unlock_irqrestore(&info->lock,flags);
1251 }
1252 
1253 /* Service an IOCTL request
1254  *
1255  * Arguments:
1256  *
1257  *      tty     pointer to tty instance data
1258  *      cmd     IOCTL command code
1259  *      arg     command argument/context
1260  *
1261  * Return Value:        0 if success, otherwise error code
1262  */
1263 static int ioctl(struct tty_struct *tty,
1264                  unsigned int cmd, unsigned long arg)
1265 {
1266         SLMP_INFO *info = tty->driver_data;
1267         void __user *argp = (void __user *)arg;
1268 
1269         if (debug_level >= DEBUG_LEVEL_INFO)
1270                 printk("%s(%d):%s ioctl() cmd=%08X\n", __FILE__,__LINE__,
1271                         info->device_name, cmd );
1272 
1273         if (sanity_check(info, tty->name, "ioctl"))
1274                 return -ENODEV;
1275 
1276         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1277             (cmd != TIOCMIWAIT)) {
1278                 if (tty->flags & (1 << TTY_IO_ERROR))
1279                     return -EIO;
1280         }
1281 
1282         switch (cmd) {
1283         case MGSL_IOCGPARAMS:
1284                 return get_params(info, argp);
1285         case MGSL_IOCSPARAMS:
1286                 return set_params(info, argp);
1287         case MGSL_IOCGTXIDLE:
1288                 return get_txidle(info, argp);
1289         case MGSL_IOCSTXIDLE:
1290                 return set_txidle(info, (int)arg);
1291         case MGSL_IOCTXENABLE:
1292                 return tx_enable(info, (int)arg);
1293         case MGSL_IOCRXENABLE:
1294                 return rx_enable(info, (int)arg);
1295         case MGSL_IOCTXABORT:
1296                 return tx_abort(info);
1297         case MGSL_IOCGSTATS:
1298                 return get_stats(info, argp);
1299         case MGSL_IOCWAITEVENT:
1300                 return wait_mgsl_event(info, argp);
1301         case MGSL_IOCLOOPTXDONE:
1302                 return 0; // TODO: Not supported, need to document
1303                 /* Wait for modem input (DCD,RI,DSR,CTS) change
1304                  * as specified by mask in arg (TIOCM_RNG/DSR/CD/CTS)
1305                  */
1306         case TIOCMIWAIT:
1307                 return modem_input_wait(info,(int)arg);
1308                 
1309                 /*
1310                  * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1311                  * Return: write counters to the user passed counter struct
1312                  * NB: both 1->0 and 0->1 transitions are counted except for
1313                  *     RI where only 0->1 is counted.
1314                  */
1315         default:
1316                 return -ENOIOCTLCMD;
1317         }
1318         return 0;
1319 }
1320 
1321 static int get_icount(struct tty_struct *tty,
1322                                 struct serial_icounter_struct *icount)
1323 {
1324         SLMP_INFO *info = tty->driver_data;
1325         struct mgsl_icount cnow;        /* kernel counter temps */
1326         unsigned long flags;
1327 
1328         spin_lock_irqsave(&info->lock,flags);
1329         cnow = info->icount;
1330         spin_unlock_irqrestore(&info->lock,flags);
1331 
1332         icount->cts = cnow.cts;
1333         icount->dsr = cnow.dsr;
1334         icount->rng = cnow.rng;
1335         icount->dcd = cnow.dcd;
1336         icount->rx = cnow.rx;
1337         icount->tx = cnow.tx;
1338         icount->frame = cnow.frame;
1339         icount->overrun = cnow.overrun;
1340         icount->parity = cnow.parity;
1341         icount->brk = cnow.brk;
1342         icount->buf_overrun = cnow.buf_overrun;
1343 
1344         return 0;
1345 }
1346 
1347 /*
1348  * /proc fs routines....
1349  */
1350 
1351 static inline void line_info(struct seq_file *m, SLMP_INFO *info)
1352 {
1353         char    stat_buf[30];
1354         unsigned long flags;
1355 
1356         seq_printf(m, "%s: SCABase=%08x Mem=%08X StatusControl=%08x LCR=%08X\n"
1357                        "\tIRQ=%d MaxFrameSize=%u\n",
1358                 info->device_name,
1359                 info->phys_sca_base,
1360                 info->phys_memory_base,
1361                 info->phys_statctrl_base,
1362                 info->phys_lcr_base,
1363                 info->irq_level,
1364                 info->max_frame_size );
1365 
1366         /* output current serial signal states */
1367         spin_lock_irqsave(&info->lock,flags);
1368         get_signals(info);
1369         spin_unlock_irqrestore(&info->lock,flags);
1370 
1371         stat_buf[0] = 0;
1372         stat_buf[1] = 0;
1373         if (info->serial_signals & SerialSignal_RTS)
1374                 strcat(stat_buf, "|RTS");
1375         if (info->serial_signals & SerialSignal_CTS)
1376                 strcat(stat_buf, "|CTS");
1377         if (info->serial_signals & SerialSignal_DTR)
1378                 strcat(stat_buf, "|DTR");
1379         if (info->serial_signals & SerialSignal_DSR)
1380                 strcat(stat_buf, "|DSR");
1381         if (info->serial_signals & SerialSignal_DCD)
1382                 strcat(stat_buf, "|CD");
1383         if (info->serial_signals & SerialSignal_RI)
1384                 strcat(stat_buf, "|RI");
1385 
1386         if (info->params.mode == MGSL_MODE_HDLC) {
1387                 seq_printf(m, "\tHDLC txok:%d rxok:%d",
1388                               info->icount.txok, info->icount.rxok);
1389                 if (info->icount.txunder)
1390                         seq_printf(m, " txunder:%d", info->icount.txunder);
1391                 if (info->icount.txabort)
1392                         seq_printf(m, " txabort:%d", info->icount.txabort);
1393                 if (info->icount.rxshort)
1394                         seq_printf(m, " rxshort:%d", info->icount.rxshort);
1395                 if (info->icount.rxlong)
1396                         seq_printf(m, " rxlong:%d", info->icount.rxlong);
1397                 if (info->icount.rxover)
1398                         seq_printf(m, " rxover:%d", info->icount.rxover);
1399                 if (info->icount.rxcrc)
1400                         seq_printf(m, " rxlong:%d", info->icount.rxcrc);
1401         } else {
1402                 seq_printf(m, "\tASYNC tx:%d rx:%d",
1403                               info->icount.tx, info->icount.rx);
1404                 if (info->icount.frame)
1405                         seq_printf(m, " fe:%d", info->icount.frame);
1406                 if (info->icount.parity)
1407                         seq_printf(m, " pe:%d", info->icount.parity);
1408                 if (info->icount.brk)
1409                         seq_printf(m, " brk:%d", info->icount.brk);
1410                 if (info->icount.overrun)
1411                         seq_printf(m, " oe:%d", info->icount.overrun);
1412         }
1413 
1414         /* Append serial signal status to end */
1415         seq_printf(m, " %s\n", stat_buf+1);
1416 
1417         seq_printf(m, "\ttxactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
1418          info->tx_active,info->bh_requested,info->bh_running,
1419          info->pending_bh);
1420 }
1421 
1422 /* Called to print information about devices
1423  */
1424 static int synclinkmp_proc_show(struct seq_file *m, void *v)
1425 {
1426         SLMP_INFO *info;
1427 
1428         seq_printf(m, "synclinkmp driver:%s\n", driver_version);
1429 
1430         info = synclinkmp_device_list;
1431         while( info ) {
1432                 line_info(m, info);
1433                 info = info->next_device;
1434         }
1435         return 0;
1436 }
1437 
1438 static int synclinkmp_proc_open(struct inode *inode, struct file *file)
1439 {
1440         return single_open(file, synclinkmp_proc_show, NULL);
1441 }
1442 
1443 static const struct file_operations synclinkmp_proc_fops = {
1444         .owner          = THIS_MODULE,
1445         .open           = synclinkmp_proc_open,
1446         .read           = seq_read,
1447         .llseek         = seq_lseek,
1448         .release        = single_release,
1449 };
1450 
1451 /* Return the count of bytes in transmit buffer
1452  */
1453 static int chars_in_buffer(struct tty_struct *tty)
1454 {
1455         SLMP_INFO *info = tty->driver_data;
1456 
1457         if (sanity_check(info, tty->name, "chars_in_buffer"))
1458                 return 0;
1459 
1460         if (debug_level >= DEBUG_LEVEL_INFO)
1461                 printk("%s(%d):%s chars_in_buffer()=%d\n",
1462                        __FILE__, __LINE__, info->device_name, info->tx_count);
1463 
1464         return info->tx_count;
1465 }
1466 
1467 /* Signal remote device to throttle send data (our receive data)
1468  */
1469 static void throttle(struct tty_struct * tty)
1470 {
1471         SLMP_INFO *info = tty->driver_data;
1472         unsigned long flags;
1473 
1474         if (debug_level >= DEBUG_LEVEL_INFO)
1475                 printk("%s(%d):%s throttle() entry\n",
1476                          __FILE__,__LINE__, info->device_name );
1477 
1478         if (sanity_check(info, tty->name, "throttle"))
1479                 return;
1480 
1481         if (I_IXOFF(tty))
1482                 send_xchar(tty, STOP_CHAR(tty));
1483 
1484         if (tty->termios.c_cflag & CRTSCTS) {
1485                 spin_lock_irqsave(&info->lock,flags);
1486                 info->serial_signals &= ~SerialSignal_RTS;
1487                 set_signals(info);
1488                 spin_unlock_irqrestore(&info->lock,flags);
1489         }
1490 }
1491 
1492 /* Signal remote device to stop throttling send data (our receive data)
1493  */
1494 static void unthrottle(struct tty_struct * tty)
1495 {
1496         SLMP_INFO *info = tty->driver_data;
1497         unsigned long flags;
1498 
1499         if (debug_level >= DEBUG_LEVEL_INFO)
1500                 printk("%s(%d):%s unthrottle() entry\n",
1501                          __FILE__,__LINE__, info->device_name );
1502 
1503         if (sanity_check(info, tty->name, "unthrottle"))
1504                 return;
1505 
1506         if (I_IXOFF(tty)) {
1507                 if (info->x_char)
1508                         info->x_char = 0;
1509                 else
1510                         send_xchar(tty, START_CHAR(tty));
1511         }
1512 
1513         if (tty->termios.c_cflag & CRTSCTS) {
1514                 spin_lock_irqsave(&info->lock,flags);
1515                 info->serial_signals |= SerialSignal_RTS;
1516                 set_signals(info);
1517                 spin_unlock_irqrestore(&info->lock,flags);
1518         }
1519 }
1520 
1521 /* set or clear transmit break condition
1522  * break_state  -1=set break condition, 0=clear
1523  */
1524 static int set_break(struct tty_struct *tty, int break_state)
1525 {
1526         unsigned char RegValue;
1527         SLMP_INFO * info = tty->driver_data;
1528         unsigned long flags;
1529 
1530         if (debug_level >= DEBUG_LEVEL_INFO)
1531                 printk("%s(%d):%s set_break(%d)\n",
1532                          __FILE__,__LINE__, info->device_name, break_state);
1533 
1534         if (sanity_check(info, tty->name, "set_break"))
1535                 return -EINVAL;
1536 
1537         spin_lock_irqsave(&info->lock,flags);
1538         RegValue = read_reg(info, CTL);
1539         if (break_state == -1)
1540                 RegValue |= BIT3;
1541         else
1542                 RegValue &= ~BIT3;
1543         write_reg(info, CTL, RegValue);
1544         spin_unlock_irqrestore(&info->lock,flags);
1545         return 0;
1546 }
1547 
1548 #if SYNCLINK_GENERIC_HDLC
1549 
1550 /**
1551  * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
1552  * set encoding and frame check sequence (FCS) options
1553  *
1554  * dev       pointer to network device structure
1555  * encoding  serial encoding setting
1556  * parity    FCS setting
1557  *
1558  * returns 0 if success, otherwise error code
1559  */
1560 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
1561                           unsigned short parity)
1562 {
1563         SLMP_INFO *info = dev_to_port(dev);
1564         unsigned char  new_encoding;
1565         unsigned short new_crctype;
1566 
1567         /* return error if TTY interface open */
1568         if (info->port.count)
1569                 return -EBUSY;
1570 
1571         switch (encoding)
1572         {
1573         case ENCODING_NRZ:        new_encoding = HDLC_ENCODING_NRZ; break;
1574         case ENCODING_NRZI:       new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
1575         case ENCODING_FM_MARK:    new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
1576         case ENCODING_FM_SPACE:   new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
1577         case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
1578         default: return -EINVAL;
1579         }
1580 
1581         switch (parity)
1582         {
1583         case PARITY_NONE:            new_crctype = HDLC_CRC_NONE; break;
1584         case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
1585         case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
1586         default: return -EINVAL;
1587         }
1588 
1589         info->params.encoding = new_encoding;
1590         info->params.crc_type = new_crctype;
1591 
1592         /* if network interface up, reprogram hardware */
1593         if (info->netcount)
1594                 program_hw(info);
1595 
1596         return 0;
1597 }
1598 
1599 /**
1600  * called by generic HDLC layer to send frame
1601  *
1602  * skb  socket buffer containing HDLC frame
1603  * dev  pointer to network device structure
1604  */
1605 static netdev_tx_t hdlcdev_xmit(struct sk_buff *skb,
1606                                       struct net_device *dev)
1607 {
1608         SLMP_INFO *info = dev_to_port(dev);
1609         unsigned long flags;
1610 
1611         if (debug_level >= DEBUG_LEVEL_INFO)
1612                 printk(KERN_INFO "%s:hdlc_xmit(%s)\n",__FILE__,dev->name);
1613 
1614         /* stop sending until this frame completes */
1615         netif_stop_queue(dev);
1616 
1617         /* copy data to device buffers */
1618         info->tx_count = skb->len;
1619         tx_load_dma_buffer(info, skb->data, skb->len);
1620 
1621         /* update network statistics */
1622         dev->stats.tx_packets++;
1623         dev->stats.tx_bytes += skb->len;
1624 
1625         /* done with socket buffer, so free it */
1626         dev_kfree_skb(skb);
1627 
1628         /* save start time for transmit timeout detection */
1629         dev->trans_start = jiffies;
1630 
1631         /* start hardware transmitter if necessary */
1632         spin_lock_irqsave(&info->lock,flags);
1633         if (!info->tx_active)
1634                 tx_start(info);
1635         spin_unlock_irqrestore(&info->lock,flags);
1636 
1637         return NETDEV_TX_OK;
1638 }
1639 
1640 /**
1641  * called by network layer when interface enabled
1642  * claim resources and initialize hardware
1643  *
1644  * dev  pointer to network device structure
1645  *
1646  * returns 0 if success, otherwise error code
1647  */
1648 static int hdlcdev_open(struct net_device *dev)
1649 {
1650         SLMP_INFO *info = dev_to_port(dev);
1651         int rc;
1652         unsigned long flags;
1653 
1654         if (debug_level >= DEBUG_LEVEL_INFO)
1655                 printk("%s:hdlcdev_open(%s)\n",__FILE__,dev->name);
1656 
1657         /* generic HDLC layer open processing */
1658         if ((rc = hdlc_open(dev)))
1659                 return rc;
1660 
1661         /* arbitrate between network and tty opens */
1662         spin_lock_irqsave(&info->netlock, flags);
1663         if (info->port.count != 0 || info->netcount != 0) {
1664                 printk(KERN_WARNING "%s: hdlc_open returning busy\n", dev->name);
1665                 spin_unlock_irqrestore(&info->netlock, flags);
1666                 return -EBUSY;
1667         }
1668         info->netcount=1;
1669         spin_unlock_irqrestore(&info->netlock, flags);
1670 
1671         /* claim resources and init adapter */
1672         if ((rc = startup(info)) != 0) {
1673                 spin_lock_irqsave(&info->netlock, flags);
1674                 info->netcount=0;
1675                 spin_unlock_irqrestore(&info->netlock, flags);
1676                 return rc;
1677         }
1678 
1679         /* assert RTS and DTR, apply hardware settings */
1680         info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR;
1681         program_hw(info);
1682 
1683         /* enable network layer transmit */
1684         dev->trans_start = jiffies;
1685         netif_start_queue(dev);
1686 
1687         /* inform generic HDLC layer of current DCD status */
1688         spin_lock_irqsave(&info->lock, flags);
1689         get_signals(info);
1690         spin_unlock_irqrestore(&info->lock, flags);
1691         if (info->serial_signals & SerialSignal_DCD)
1692                 netif_carrier_on(dev);
1693         else
1694                 netif_carrier_off(dev);
1695         return 0;
1696 }
1697 
1698 /**
1699  * called by network layer when interface is disabled
1700  * shutdown hardware and release resources
1701  *
1702  * dev  pointer to network device structure
1703  *
1704  * returns 0 if success, otherwise error code
1705  */
1706 static int hdlcdev_close(struct net_device *dev)
1707 {
1708         SLMP_INFO *info = dev_to_port(dev);
1709         unsigned long flags;
1710 
1711         if (debug_level >= DEBUG_LEVEL_INFO)
1712                 printk("%s:hdlcdev_close(%s)\n",__FILE__,dev->name);
1713 
1714         netif_stop_queue(dev);
1715 
1716         /* shutdown adapter and release resources */
1717         shutdown(info);
1718 
1719         hdlc_close(dev);
1720 
1721         spin_lock_irqsave(&info->netlock, flags);
1722         info->netcount=0;
1723         spin_unlock_irqrestore(&info->netlock, flags);
1724 
1725         return 0;
1726 }
1727 
1728 /**
1729  * called by network layer to process IOCTL call to network device
1730  *
1731  * dev  pointer to network device structure
1732  * ifr  pointer to network interface request structure
1733  * cmd  IOCTL command code
1734  *
1735  * returns 0 if success, otherwise error code
1736  */
1737 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1738 {
1739         const size_t size = sizeof(sync_serial_settings);
1740         sync_serial_settings new_line;
1741         sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
1742         SLMP_INFO *info = dev_to_port(dev);
1743         unsigned int flags;
1744 
1745         if (debug_level >= DEBUG_LEVEL_INFO)
1746                 printk("%s:hdlcdev_ioctl(%s)\n",__FILE__,dev->name);
1747 
1748         /* return error if TTY interface open */
1749         if (info->port.count)
1750                 return -EBUSY;
1751 
1752         if (cmd != SIOCWANDEV)
1753                 return hdlc_ioctl(dev, ifr, cmd);
1754 
1755         switch(ifr->ifr_settings.type) {
1756         case IF_GET_IFACE: /* return current sync_serial_settings */
1757 
1758                 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
1759                 if (ifr->ifr_settings.size < size) {
1760                         ifr->ifr_settings.size = size; /* data size wanted */
1761                         return -ENOBUFS;
1762                 }
1763 
1764                 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1765                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1766                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1767                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
1768 
1769                 memset(&new_line, 0, sizeof(new_line));
1770                 switch (flags){
1771                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
1772                 case (HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_INT; break;
1773                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_TXINT; break;
1774                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
1775                 default: new_line.clock_type = CLOCK_DEFAULT;
1776                 }
1777 
1778                 new_line.clock_rate = info->params.clock_speed;
1779                 new_line.loopback   = info->params.loopback ? 1:0;
1780 
1781                 if (copy_to_user(line, &new_line, size))
1782                         return -EFAULT;
1783                 return 0;
1784 
1785         case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
1786 
1787                 if(!capable(CAP_NET_ADMIN))
1788                         return -EPERM;
1789                 if (copy_from_user(&new_line, line, size))
1790                         return -EFAULT;
1791 
1792                 switch (new_line.clock_type)
1793                 {
1794                 case CLOCK_EXT:      flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
1795                 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
1796                 case CLOCK_INT:      flags = HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG;    break;
1797                 case CLOCK_TXINT:    flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG;    break;
1798                 case CLOCK_DEFAULT:  flags = info->params.flags &
1799                                              (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1800                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1801                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1802                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN); break;
1803                 default: return -EINVAL;
1804                 }
1805 
1806                 if (new_line.loopback != 0 && new_line.loopback != 1)
1807                         return -EINVAL;
1808 
1809                 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1810                                         HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1811                                         HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1812                                         HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
1813                 info->params.flags |= flags;
1814 
1815                 info->params.loopback = new_line.loopback;
1816 
1817                 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
1818                         info->params.clock_speed = new_line.clock_rate;
1819                 else
1820                         info->params.clock_speed = 0;
1821 
1822                 /* if network interface up, reprogram hardware */
1823                 if (info->netcount)
1824                         program_hw(info);
1825                 return 0;
1826 
1827         default:
1828                 return hdlc_ioctl(dev, ifr, cmd);
1829         }
1830 }
1831 
1832 /**
1833  * called by network layer when transmit timeout is detected
1834  *
1835  * dev  pointer to network device structure
1836  */
1837 static void hdlcdev_tx_timeout(struct net_device *dev)
1838 {
1839         SLMP_INFO *info = dev_to_port(dev);
1840         unsigned long flags;
1841 
1842         if (debug_level >= DEBUG_LEVEL_INFO)
1843                 printk("hdlcdev_tx_timeout(%s)\n",dev->name);
1844 
1845         dev->stats.tx_errors++;
1846         dev->stats.tx_aborted_errors++;
1847 
1848         spin_lock_irqsave(&info->lock,flags);
1849         tx_stop(info);
1850         spin_unlock_irqrestore(&info->lock,flags);
1851 
1852         netif_wake_queue(dev);
1853 }
1854 
1855 /**
1856  * called by device driver when transmit completes
1857  * reenable network layer transmit if stopped
1858  *
1859  * info  pointer to device instance information
1860  */
1861 static void hdlcdev_tx_done(SLMP_INFO *info)
1862 {
1863         if (netif_queue_stopped(info->netdev))
1864                 netif_wake_queue(info->netdev);
1865 }
1866 
1867 /**
1868  * called by device driver when frame received
1869  * pass frame to network layer
1870  *
1871  * info  pointer to device instance information
1872  * buf   pointer to buffer contianing frame data
1873  * size  count of data bytes in buf
1874  */
1875 static void hdlcdev_rx(SLMP_INFO *info, char *buf, int size)
1876 {
1877         struct sk_buff *skb = dev_alloc_skb(size);
1878         struct net_device *dev = info->netdev;
1879 
1880         if (debug_level >= DEBUG_LEVEL_INFO)
1881                 printk("hdlcdev_rx(%s)\n",dev->name);
1882 
1883         if (skb == NULL) {
1884                 printk(KERN_NOTICE "%s: can't alloc skb, dropping packet\n",
1885                        dev->name);
1886                 dev->stats.rx_dropped++;
1887                 return;
1888         }
1889 
1890         memcpy(skb_put(skb, size), buf, size);
1891 
1892         skb->protocol = hdlc_type_trans(skb, dev);
1893 
1894         dev->stats.rx_packets++;
1895         dev->stats.rx_bytes += size;
1896 
1897         netif_rx(skb);
1898 }
1899 
1900 static const struct net_device_ops hdlcdev_ops = {
1901         .ndo_open       = hdlcdev_open,
1902         .ndo_stop       = hdlcdev_close,
1903         .ndo_change_mtu = hdlc_change_mtu,
1904         .ndo_start_xmit = hdlc_start_xmit,
1905         .ndo_do_ioctl   = hdlcdev_ioctl,
1906         .ndo_tx_timeout = hdlcdev_tx_timeout,
1907 };
1908 
1909 /**
1910  * called by device driver when adding device instance
1911  * do generic HDLC initialization
1912  *
1913  * info  pointer to device instance information
1914  *
1915  * returns 0 if success, otherwise error code
1916  */
1917 static int hdlcdev_init(SLMP_INFO *info)
1918 {
1919         int rc;
1920         struct net_device *dev;
1921         hdlc_device *hdlc;
1922 
1923         /* allocate and initialize network and HDLC layer objects */
1924 
1925         if (!(dev = alloc_hdlcdev(info))) {
1926                 printk(KERN_ERR "%s:hdlc device allocation failure\n",__FILE__);
1927                 return -ENOMEM;
1928         }
1929 
1930         /* for network layer reporting purposes only */
1931         dev->mem_start = info->phys_sca_base;
1932         dev->mem_end   = info->phys_sca_base + SCA_BASE_SIZE - 1;
1933         dev->irq       = info->irq_level;
1934 
1935         /* network layer callbacks and settings */
1936         dev->netdev_ops     = &hdlcdev_ops;
1937         dev->watchdog_timeo = 10 * HZ;
1938         dev->tx_queue_len   = 50;
1939 
1940         /* generic HDLC layer callbacks and settings */
1941         hdlc         = dev_to_hdlc(dev);
1942         hdlc->attach = hdlcdev_attach;
1943         hdlc->xmit   = hdlcdev_xmit;
1944 
1945         /* register objects with HDLC layer */
1946         if ((rc = register_hdlc_device(dev))) {
1947                 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
1948                 free_netdev(dev);
1949                 return rc;
1950         }
1951 
1952         info->netdev = dev;
1953         return 0;
1954 }
1955 
1956 /**
1957  * called by device driver when removing device instance
1958  * do generic HDLC cleanup
1959  *
1960  * info  pointer to device instance information
1961  */
1962 static void hdlcdev_exit(SLMP_INFO *info)
1963 {
1964         unregister_hdlc_device(info->netdev);
1965         free_netdev(info->netdev);
1966         info->netdev = NULL;
1967 }
1968 
1969 #endif /* CONFIG_HDLC */
1970 
1971 
1972 /* Return next bottom half action to perform.
1973  * Return Value:        BH action code or 0 if nothing to do.
1974  */
1975 static int bh_action(SLMP_INFO *info)
1976 {
1977         unsigned long flags;
1978         int rc = 0;
1979 
1980         spin_lock_irqsave(&info->lock,flags);
1981 
1982         if (info->pending_bh & BH_RECEIVE) {
1983                 info->pending_bh &= ~BH_RECEIVE;
1984                 rc = BH_RECEIVE;
1985         } else if (info->pending_bh & BH_TRANSMIT) {
1986                 info->pending_bh &= ~BH_TRANSMIT;
1987                 rc = BH_TRANSMIT;
1988         } else if (info->pending_bh & BH_STATUS) {
1989                 info->pending_bh &= ~BH_STATUS;
1990                 rc = BH_STATUS;
1991         }
1992 
1993         if (!rc) {
1994                 /* Mark BH routine as complete */
1995                 info->bh_running = false;
1996                 info->bh_requested = false;
1997         }
1998 
1999         spin_unlock_irqrestore(&info->lock,flags);
2000 
2001         return rc;
2002 }
2003 
2004 /* Perform bottom half processing of work items queued by ISR.
2005  */
2006 static void bh_handler(struct work_struct *work)
2007 {
2008         SLMP_INFO *info = container_of(work, SLMP_INFO, task);
2009         int action;
2010 
2011         if ( debug_level >= DEBUG_LEVEL_BH )
2012                 printk( "%s(%d):%s bh_handler() entry\n",
2013                         __FILE__,__LINE__,info->device_name);
2014 
2015         info->bh_running = true;
2016 
2017         while((action = bh_action(info)) != 0) {
2018 
2019                 /* Process work item */
2020                 if ( debug_level >= DEBUG_LEVEL_BH )
2021                         printk( "%s(%d):%s bh_handler() work item action=%d\n",
2022                                 __FILE__,__LINE__,info->device_name, action);
2023 
2024                 switch (action) {
2025 
2026                 case BH_RECEIVE:
2027                         bh_receive(info);
2028                         break;
2029                 case BH_TRANSMIT:
2030                         bh_transmit(info);
2031                         break;
2032                 case BH_STATUS:
2033                         bh_status(info);
2034                         break;
2035                 default:
2036                         /* unknown work item ID */
2037                         printk("%s(%d):%s Unknown work item ID=%08X!\n",
2038                                 __FILE__,__LINE__,info->device_name,action);
2039                         break;
2040                 }
2041         }
2042 
2043         if ( debug_level >= DEBUG_LEVEL_BH )
2044                 printk( "%s(%d):%s bh_handler() exit\n",
2045                         __FILE__,__LINE__,info->device_name);
2046 }
2047 
2048 static void bh_receive(SLMP_INFO *info)
2049 {
2050         if ( debug_level >= DEBUG_LEVEL_BH )
2051                 printk( "%s(%d):%s bh_receive()\n",
2052                         __FILE__,__LINE__,info->device_name);
2053 
2054         while( rx_get_frame(info) );
2055 }
2056 
2057 static void bh_transmit(SLMP_INFO *info)
2058 {
2059         struct tty_struct *tty = info->port.tty;
2060 
2061         if ( debug_level >= DEBUG_LEVEL_BH )
2062                 printk( "%s(%d):%s bh_transmit() entry\n",
2063                         __FILE__,__LINE__,info->device_name);
2064 
2065         if (tty)
2066                 tty_wakeup(tty);
2067 }
2068 
2069 static void bh_status(SLMP_INFO *info)
2070 {
2071         if ( debug_level >= DEBUG_LEVEL_BH )
2072                 printk( "%s(%d):%s bh_status() entry\n",
2073                         __FILE__,__LINE__,info->device_name);
2074 
2075         info->ri_chkcount = 0;
2076         info->dsr_chkcount = 0;
2077         info->dcd_chkcount = 0;
2078         info->cts_chkcount = 0;
2079 }
2080 
2081 static void isr_timer(SLMP_INFO * info)
2082 {
2083         unsigned char timer = (info->port_num & 1) ? TIMER2 : TIMER0;
2084 
2085         /* IER2<7..4> = timer<3..0> interrupt enables (0=disabled) */
2086         write_reg(info, IER2, 0);
2087 
2088         /* TMCS, Timer Control/Status Register
2089          *
2090          * 07      CMF, Compare match flag (read only) 1=match
2091          * 06      ECMI, CMF Interrupt Enable: 0=disabled
2092          * 05      Reserved, must be 0
2093          * 04      TME, Timer Enable
2094          * 03..00  Reserved, must be 0
2095          *
2096          * 0000 0000
2097          */
2098         write_reg(info, (unsigned char)(timer + TMCS), 0);
2099 
2100         info->irq_occurred = true;
2101 
2102         if ( debug_level >= DEBUG_LEVEL_ISR )
2103                 printk("%s(%d):%s isr_timer()\n",
2104                         __FILE__,__LINE__,info->device_name);
2105 }
2106 
2107 static void isr_rxint(SLMP_INFO * info)
2108 {
2109         struct tty_struct *tty = info->port.tty;
2110         struct  mgsl_icount *icount = &info->icount;
2111         unsigned char status = read_reg(info, SR1) & info->ie1_value & (FLGD + IDLD + CDCD + BRKD);
2112         unsigned char status2 = read_reg(info, SR2) & info->ie2_value & OVRN;
2113 
2114         /* clear status bits */
2115         if (status)
2116                 write_reg(info, SR1, status);
2117 
2118         if (status2)
2119                 write_reg(info, SR2, status2);
2120         
2121         if ( debug_level >= DEBUG_LEVEL_ISR )
2122                 printk("%s(%d):%s isr_rxint status=%02X %02x\n",
2123                         __FILE__,__LINE__,info->device_name,status,status2);
2124 
2125         if (info->params.mode == MGSL_MODE_ASYNC) {
2126                 if (status & BRKD) {
2127                         icount->brk++;
2128 
2129                         /* process break detection if tty control
2130                          * is not set to ignore it
2131                          */
2132                         if (!(status & info->ignore_status_mask1)) {
2133                                 if (info->read_status_mask1 & BRKD) {
2134                                         tty_insert_flip_char(&info->port, 0, TTY_BREAK);
2135                                         if (tty && (info->port.flags & ASYNC_SAK))
2136                                                 do_SAK(tty);
2137                                 }
2138                         }
2139                 }
2140         }
2141         else {
2142                 if (status & (FLGD|IDLD)) {
2143                         if (status & FLGD)
2144                                 info->icount.exithunt++;
2145                         else if (status & IDLD)
2146                                 info->icount.rxidle++;
2147                         wake_up_interruptible(&info->event_wait_q);
2148                 }
2149         }
2150 
2151         if (status & CDCD) {
2152                 /* simulate a common modem status change interrupt
2153                  * for our handler
2154                  */
2155                 get_signals( info );
2156                 isr_io_pin(info,
2157                         MISCSTATUS_DCD_LATCHED|(info->serial_signals&SerialSignal_DCD));
2158         }
2159 }
2160 
2161 /*
2162  * handle async rx data interrupts
2163  */
2164 static void isr_rxrdy(SLMP_INFO * info)
2165 {
2166         u16 status;
2167         unsigned char DataByte;
2168         struct  mgsl_icount *icount = &info->icount;
2169 
2170         if ( debug_level >= DEBUG_LEVEL_ISR )
2171                 printk("%s(%d):%s isr_rxrdy\n",
2172                         __FILE__,__LINE__,info->device_name);
2173 
2174         while((status = read_reg(info,CST0)) & BIT0)
2175         {
2176                 int flag = 0;
2177                 bool over = false;
2178                 DataByte = read_reg(info,TRB);
2179 
2180                 icount->rx++;
2181 
2182                 if ( status & (PE + FRME + OVRN) ) {
2183                         printk("%s(%d):%s rxerr=%04X\n",
2184                                 __FILE__,__LINE__,info->device_name,status);
2185 
2186                         /* update error statistics */
2187                         if (status & PE)
2188                                 icount->parity++;
2189                         else if (status & FRME)
2190                                 icount->frame++;
2191                         else if (status & OVRN)
2192                                 icount->overrun++;
2193 
2194                         /* discard char if tty control flags say so */
2195                         if (status & info->ignore_status_mask2)
2196                                 continue;
2197 
2198                         status &= info->read_status_mask2;
2199 
2200                         if (status & PE)
2201                                 flag = TTY_PARITY;
2202                         else if (status & FRME)
2203                                 flag = TTY_FRAME;
2204                         if (status & OVRN) {
2205                                 /* Overrun is special, since it's
2206                                  * reported immediately, and doesn't
2207                                  * affect the current character
2208                                  */
2209                                 over = true;
2210                         }
2211                 }       /* end of if (error) */
2212 
2213                 tty_insert_flip_char(&info->port, DataByte, flag);
2214                 if (over)
2215                         tty_insert_flip_char(&info->port, 0, TTY_OVERRUN);
2216         }
2217 
2218         if ( debug_level >= DEBUG_LEVEL_ISR ) {
2219                 printk("%s(%d):%s rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
2220                         __FILE__,__LINE__,info->device_name,
2221                         icount->rx,icount->brk,icount->parity,
2222                         icount->frame,icount->overrun);
2223         }
2224 
2225         tty_flip_buffer_push(&info->port);
2226 }
2227 
2228 static void isr_txeom(SLMP_INFO * info, unsigned char status)
2229 {
2230         if ( debug_level >= DEBUG_LEVEL_ISR )
2231                 printk("%s(%d):%s isr_txeom status=%02x\n",
2232                         __FILE__,__LINE__,info->device_name,status);
2233 
2234         write_reg(info, TXDMA + DIR, 0x00); /* disable Tx DMA IRQs */
2235         write_reg(info, TXDMA + DSR, 0xc0); /* clear IRQs and disable DMA */
2236         write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
2237 
2238         if (status & UDRN) {
2239                 write_reg(info, CMD, TXRESET);
2240                 write_reg(info, CMD, TXENABLE);
2241         } else
2242                 write_reg(info, CMD, TXBUFCLR);
2243 
2244         /* disable and clear tx interrupts */
2245         info->ie0_value &= ~TXRDYE;
2246         info->ie1_value &= ~(IDLE + UDRN);
2247         write_reg16(info, IE0, (unsigned short)((info->ie1_value << 8) + info->ie0_value));
2248         write_reg(info, SR1, (unsigned char)(UDRN + IDLE));
2249 
2250         if ( info->tx_active ) {
2251                 if (info->params.mode != MGSL_MODE_ASYNC) {
2252                         if (status & UDRN)
2253                                 info->icount.txunder++;
2254                         else if (status & IDLE)
2255                                 info->icount.txok++;
2256                 }
2257 
2258                 info->tx_active = false;
2259                 info->tx_count = info->tx_put = info->tx_get = 0;
2260 
2261                 del_timer(&info->tx_timer);
2262 
2263                 if (info->params.mode != MGSL_MODE_ASYNC && info->drop_rts_on_tx_done ) {
2264                         info->serial_signals &= ~SerialSignal_RTS;
2265                         info->drop_rts_on_tx_done = false;
2266                         set_signals(info);
2267                 }
2268 
2269 #if SYNCLINK_GENERIC_HDLC
2270                 if (info->netcount)
2271                         hdlcdev_tx_done(info);
2272                 else
2273 #endif
2274                 {
2275                         if (info->port.tty && (info->port.tty->stopped || info->port.tty->hw_stopped)) {
2276                                 tx_stop(info);
2277                                 return;
2278                         }
2279                         info->pending_bh |= BH_TRANSMIT;
2280                 }
2281         }
2282 }
2283 
2284 
2285 /*
2286  * handle tx status interrupts
2287  */
2288 static void isr_txint(SLMP_INFO * info)
2289 {
2290         unsigned char status = read_reg(info, SR1) & info->ie1_value & (UDRN + IDLE + CCTS);
2291 
2292         /* clear status bits */
2293         write_reg(info, SR1, status);
2294 
2295         if ( debug_level >= DEBUG_LEVEL_ISR )
2296                 printk("%s(%d):%s isr_txint status=%02x\n",
2297                         __FILE__,__LINE__,info->device_name,status);
2298 
2299         if (status & (UDRN + IDLE))
2300                 isr_txeom(info, status);
2301 
2302         if (status & CCTS) {
2303                 /* simulate a common modem status change interrupt
2304                  * for our handler
2305                  */
2306                 get_signals( info );
2307                 isr_io_pin(info,
2308                         MISCSTATUS_CTS_LATCHED|(info->serial_signals&SerialSignal_CTS));
2309 
2310         }
2311 }
2312 
2313 /*
2314  * handle async tx data interrupts
2315  */
2316 static void isr_txrdy(SLMP_INFO * info)
2317 {
2318         if ( debug_level >= DEBUG_LEVEL_ISR )
2319                 printk("%s(%d):%s isr_txrdy() tx_count=%d\n",
2320                         __FILE__,__LINE__,info->device_name,info->tx_count);
2321 
2322         if (info->params.mode != MGSL_MODE_ASYNC) {
2323                 /* disable TXRDY IRQ, enable IDLE IRQ */
2324                 info->ie0_value &= ~TXRDYE;
2325                 info->ie1_value |= IDLE;
2326                 write_reg16(info, IE0, (unsigned short)((info->ie1_value << 8) + info->ie0_value));
2327                 return;
2328         }
2329 
2330         if (info->port.tty && (info->port.tty->stopped || info->port.tty->hw_stopped)) {
2331                 tx_stop(info);
2332                 return;
2333         }
2334 
2335         if ( info->tx_count )
2336                 tx_load_fifo( info );
2337         else {
2338                 info->tx_active = false;
2339                 info->ie0_value &= ~TXRDYE;
2340                 write_reg(info, IE0, info->ie0_value);
2341         }
2342 
2343         if (info->tx_count < WAKEUP_CHARS)
2344                 info->pending_bh |= BH_TRANSMIT;
2345 }
2346 
2347 static void isr_rxdmaok(SLMP_INFO * info)
2348 {
2349         /* BIT7 = EOT (end of transfer)
2350          * BIT6 = EOM (end of message/frame)
2351          */
2352         unsigned char status = read_reg(info,RXDMA + DSR) & 0xc0;
2353 
2354         /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2355         write_reg(info, RXDMA + DSR, (unsigned char)(status | 1));
2356 
2357         if ( debug_level >= DEBUG_LEVEL_ISR )
2358                 printk("%s(%d):%s isr_rxdmaok(), status=%02x\n",
2359                         __FILE__,__LINE__,info->device_name,status);
2360 
2361         info->pending_bh |= BH_RECEIVE;
2362 }
2363 
2364 static void isr_rxdmaerror(SLMP_INFO * info)
2365 {
2366         /* BIT5 = BOF (buffer overflow)
2367          * BIT4 = COF (counter overflow)
2368          */
2369         unsigned char status = read_reg(info,RXDMA + DSR) & 0x30;
2370 
2371         /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2372         write_reg(info, RXDMA + DSR, (unsigned char)(status | 1));
2373 
2374         if ( debug_level >= DEBUG_LEVEL_ISR )
2375                 printk("%s(%d):%s isr_rxdmaerror(), status=%02x\n",
2376                         __FILE__,__LINE__,info->device_name,status);
2377 
2378         info->rx_overflow = true;
2379         info->pending_bh |= BH_RECEIVE;
2380 }
2381 
2382 static void isr_txdmaok(SLMP_INFO * info)
2383 {
2384         unsigned char status_reg1 = read_reg(info, SR1);
2385 
2386         write_reg(info, TXDMA + DIR, 0x00);     /* disable Tx DMA IRQs */
2387         write_reg(info, TXDMA + DSR, 0xc0); /* clear IRQs and disable DMA */
2388         write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
2389 
2390         if ( debug_level >= DEBUG_LEVEL_ISR )
2391                 printk("%s(%d):%s isr_txdmaok(), status=%02x\n",
2392                         __FILE__,__LINE__,info->device_name,status_reg1);
2393 
2394         /* program TXRDY as FIFO empty flag, enable TXRDY IRQ */
2395         write_reg16(info, TRC0, 0);
2396         info->ie0_value |= TXRDYE;
2397         write_reg(info, IE0, info->ie0_value);
2398 }
2399 
2400 static void isr_txdmaerror(SLMP_INFO * info)
2401 {
2402         /* BIT5 = BOF (buffer overflow)
2403          * BIT4 = COF (counter overflow)
2404          */
2405         unsigned char status = read_reg(info,TXDMA + DSR) & 0x30;
2406 
2407         /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2408         write_reg(info, TXDMA + DSR, (unsigned char)(status | 1));
2409 
2410         if ( debug_level >= DEBUG_LEVEL_ISR )
2411                 printk("%s(%d):%s isr_txdmaerror(), status=%02x\n",
2412                         __FILE__,__LINE__,info->device_name,status);
2413 }
2414 
2415 /* handle input serial signal changes
2416  */
2417 static void isr_io_pin( SLMP_INFO *info, u16 status )
2418 {
2419         struct  mgsl_icount *icount;
2420 
2421         if ( debug_level >= DEBUG_LEVEL_ISR )
2422                 printk("%s(%d):isr_io_pin status=%04X\n",
2423                         __FILE__,__LINE__,status);
2424 
2425         if (status & (MISCSTATUS_CTS_LATCHED | MISCSTATUS_DCD_LATCHED |
2426                       MISCSTATUS_DSR_LATCHED | MISCSTATUS_RI_LATCHED) ) {
2427                 icount = &info->icount;
2428                 /* update input line counters */
2429                 if (status & MISCSTATUS_RI_LATCHED) {
2430                         icount->rng++;
2431                         if ( status & SerialSignal_RI )
2432                                 info->input_signal_events.ri_up++;
2433                         else
2434                                 info->input_signal_events.ri_down++;
2435                 }
2436                 if (status & MISCSTATUS_DSR_LATCHED) {
2437                         icount->dsr++;
2438                         if ( status & SerialSignal_DSR )
2439                                 info->input_signal_events.dsr_up++;
2440                         else
2441                                 info->input_signal_events.dsr_down++;
2442                 }
2443                 if (status & MISCSTATUS_DCD_LATCHED) {
2444                         if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT) {
2445                                 info->ie1_value &= ~CDCD;
2446                                 write_reg(info, IE1, info->ie1_value);
2447                         }
2448                         icount->dcd++;
2449                         if (status & SerialSignal_DCD) {
2450                                 info->input_signal_events.dcd_up++;
2451                         } else
2452                                 info->input_signal_events.dcd_down++;
2453 #if SYNCLINK_GENERIC_HDLC
2454                         if (info->netcount) {
2455                                 if (status & SerialSignal_DCD)
2456                                         netif_carrier_on(info->netdev);
2457                                 else
2458                                         netif_carrier_off(info->netdev);
2459                         }
2460 #endif
2461                 }
2462                 if (status & MISCSTATUS_CTS_LATCHED)
2463                 {
2464                         if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT) {
2465                                 info->ie1_value &= ~CCTS;
2466                                 write_reg(info, IE1, info->ie1_value);
2467                         }
2468                         icount->cts++;
2469                         if ( status & SerialSignal_CTS )
2470                                 info->input_signal_events.cts_up++;
2471                         else
2472                                 info->input_signal_events.cts_down++;
2473                 }
2474                 wake_up_interruptible(&info->status_event_wait_q);
2475                 wake_up_interruptible(&info->event_wait_q);
2476 
2477                 if ( (info->port.flags & ASYNC_CHECK_CD) &&
2478                      (status & MISCSTATUS_DCD_LATCHED) ) {
2479                         if ( debug_level >= DEBUG_LEVEL_ISR )
2480                                 printk("%s CD now %s...", info->device_name,
2481                                        (status & SerialSignal_DCD) ? "on" : "off");
2482                         if (status & SerialSignal_DCD)
2483                                 wake_up_interruptible(&info->port.open_wait);
2484                         else {
2485                                 if ( debug_level >= DEBUG_LEVEL_ISR )
2486                                         printk("doing serial hangup...");
2487                                 if (info->port.tty)
2488                                         tty_hangup(info->port.tty);
2489                         }
2490                 }
2491 
2492                 if (tty_port_cts_enabled(&info->port) &&
2493                      (status & MISCSTATUS_CTS_LATCHED) ) {
2494                         if ( info->port.tty ) {
2495                                 if (info->port.tty->hw_stopped) {
2496                                         if (status & SerialSignal_CTS) {
2497                                                 if ( debug_level >= DEBUG_LEVEL_ISR )
2498                                                         printk("CTS tx start...");
2499                                                 info->port.tty->hw_stopped = 0;
2500                                                 tx_start(info);
2501                                                 info->pending_bh |= BH_TRANSMIT;
2502                                                 return;
2503                                         }
2504                                 } else {
2505                                         if (!(status & SerialSignal_CTS)) {
2506                                                 if ( debug_level >= DEBUG_LEVEL_ISR )
2507                                                         printk("CTS tx stop...");
2508                                                 info->port.tty->hw_stopped = 1;
2509                                                 tx_stop(info);
2510                                         }
2511                                 }
2512                         }
2513                 }
2514         }
2515 
2516         info->pending_bh |= BH_STATUS;
2517 }
2518 
2519 /* Interrupt service routine entry point.
2520  *
2521  * Arguments:
2522  *      irq             interrupt number that caused interrupt
2523  *      dev_id          device ID supplied during interrupt registration
2524  *      regs            interrupted processor context
2525  */
2526 static irqreturn_t synclinkmp_interrupt(int dummy, void *dev_id)
2527 {
2528         SLMP_INFO *info = dev_id;
2529         unsigned char status, status0, status1=0;
2530         unsigned char dmastatus, dmastatus0, dmastatus1=0;
2531         unsigned char timerstatus0, timerstatus1=0;
2532         unsigned char shift;
2533         unsigned int i;
2534         unsigned short tmp;
2535 
2536         if ( debug_level >= DEBUG_LEVEL_ISR )
2537                 printk(KERN_DEBUG "%s(%d): synclinkmp_interrupt(%d)entry.\n",
2538                         __FILE__, __LINE__, info->irq_level);
2539 
2540         spin_lock(&info->lock);
2541 
2542         for(;;) {
2543 
2544                 /* get status for SCA0 (ports 0-1) */
2545                 tmp = read_reg16(info, ISR0);   /* get ISR0 and ISR1 in one read */
2546                 status0 = (unsigned char)tmp;
2547                 dmastatus0 = (unsigned char)(tmp>>8);
2548                 timerstatus0 = read_reg(info, ISR2);
2549 
2550                 if ( debug_level >= DEBUG_LEVEL_ISR )
2551                         printk(KERN_DEBUG "%s(%d):%s status0=%02x, dmastatus0=%02x, timerstatus0=%02x\n",
2552                                 __FILE__, __LINE__, info->device_name,
2553                                 status0, dmastatus0, timerstatus0);
2554 
2555                 if (info->port_count == 4) {
2556                         /* get status for SCA1 (ports 2-3) */
2557                         tmp = read_reg16(info->port_array[2], ISR0);
2558                         status1 = (unsigned char)tmp;
2559                         dmastatus1 = (unsigned char)(tmp>>8);
2560                         timerstatus1 = read_reg(info->port_array[2], ISR2);
2561 
2562                         if ( debug_level >= DEBUG_LEVEL_ISR )
2563                                 printk("%s(%d):%s status1=%02x, dmastatus1=%02x, timerstatus1=%02x\n",
2564                                         __FILE__,__LINE__,info->device_name,
2565                                         status1,dmastatus1,timerstatus1);
2566                 }
2567 
2568                 if (!status0 && !dmastatus0 && !timerstatus0 &&
2569                          !status1 && !dmastatus1 && !timerstatus1)
2570                         break;
2571 
2572                 for(i=0; i < info->port_count ; i++) {
2573                         if (info->port_array[i] == NULL)
2574                                 continue;
2575                         if (i < 2) {
2576                                 status = status0;
2577                                 dmastatus = dmastatus0;
2578                         } else {
2579                                 status = status1;
2580                                 dmastatus = dmastatus1;
2581                         }
2582 
2583                         shift = i & 1 ? 4 :0;
2584 
2585                         if (status & BIT0 << shift)
2586                                 isr_rxrdy(info->port_array[i]);
2587                         if (status & BIT1 << shift)
2588                                 isr_txrdy(info->port_array[i]);
2589                         if (status & BIT2 << shift)
2590                                 isr_rxint(info->port_array[i]);
2591                         if (status & BIT3 << shift)
2592                                 isr_txint(info->port_array[i]);
2593 
2594                         if (dmastatus & BIT0 << shift)
2595                                 isr_rxdmaerror(info->port_array[i]);
2596                         if (dmastatus & BIT1 << shift)
2597                                 isr_rxdmaok(info->port_array[i]);
2598                         if (dmastatus & BIT2 << shift)
2599                                 isr_txdmaerror(info->port_array[i]);
2600                         if (dmastatus & BIT3 << shift)
2601                                 isr_txdmaok(info->port_array[i]);
2602                 }
2603 
2604                 if (timerstatus0 & (BIT5 | BIT4))
2605                         isr_timer(info->port_array[0]);
2606                 if (timerstatus0 & (BIT7 | BIT6))
2607                         isr_timer(info->port_array[1]);
2608                 if (timerstatus1 & (BIT5 | BIT4))
2609                         isr_timer(info->port_array[2]);
2610                 if (timerstatus1 & (BIT7 | BIT6))
2611                         isr_timer(info->port_array[3]);
2612         }
2613 
2614         for(i=0; i < info->port_count ; i++) {
2615                 SLMP_INFO * port = info->port_array[i];
2616 
2617                 /* Request bottom half processing if there's something
2618                  * for it to do and the bh is not already running.
2619                  *
2620                  * Note: startup adapter diags require interrupts.
2621                  * do not request bottom half processing if the
2622                  * device is not open in a normal mode.
2623                  */
2624                 if ( port && (port->port.count || port->netcount) &&
2625                      port->pending_bh && !port->bh_running &&
2626                      !port->bh_requested ) {
2627                         if ( debug_level >= DEBUG_LEVEL_ISR )
2628                                 printk("%s(%d):%s queueing bh task.\n",
2629                                         __FILE__,__LINE__,port->device_name);
2630                         schedule_work(&port->task);
2631                         port->bh_requested = true;
2632                 }
2633         }
2634 
2635         spin_unlock(&info->lock);
2636 
2637         if ( debug_level >= DEBUG_LEVEL_ISR )
2638                 printk(KERN_DEBUG "%s(%d):synclinkmp_interrupt(%d)exit.\n",
2639                         __FILE__, __LINE__, info->irq_level);
2640         return IRQ_HANDLED;
2641 }
2642 
2643 /* Initialize and start device.
2644  */
2645 static int startup(SLMP_INFO * info)
2646 {
2647         if ( debug_level >= DEBUG_LEVEL_INFO )
2648                 printk("%s(%d):%s tx_releaseup()\n",__FILE__,__LINE__,info->device_name);
2649 
2650         if (info->port.flags & ASYNC_INITIALIZED)
2651                 return 0;
2652 
2653         if (!info->tx_buf) {
2654                 info->tx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
2655                 if (!info->tx_buf) {
2656                         printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
2657                                 __FILE__,__LINE__,info->device_name);
2658                         return -ENOMEM;
2659                 }
2660         }
2661 
2662         info->pending_bh = 0;
2663 
2664         memset(&info->icount, 0, sizeof(info->icount));
2665 
2666         /* program hardware for current parameters */
2667         reset_port(info);
2668 
2669         change_params(info);
2670 
2671         mod_timer(&info->status_timer, jiffies + msecs_to_jiffies(10));
2672 
2673         if (info->port.tty)
2674                 clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
2675 
2676         info->port.flags |= ASYNC_INITIALIZED;
2677 
2678         return 0;
2679 }
2680 
2681 /* Called by close() and hangup() to shutdown hardware
2682  */
2683 static void shutdown(SLMP_INFO * info)
2684 {
2685         unsigned long flags;
2686 
2687         if (!(info->port.flags & ASYNC_INITIALIZED))
2688                 return;
2689 
2690         if (debug_level >= DEBUG_LEVEL_INFO)
2691                 printk("%s(%d):%s synclinkmp_shutdown()\n",
2692                          __FILE__,__LINE__, info->device_name );
2693 
2694         /* clear status wait queue because status changes */
2695         /* can't happen after shutting down the hardware */
2696         wake_up_interruptible(&info->status_event_wait_q);
2697         wake_up_interruptible(&info->event_wait_q);
2698 
2699         del_timer(&info->tx_timer);
2700         del_timer(&info->status_timer);
2701 
2702         kfree(info->tx_buf);
2703         info->tx_buf = NULL;
2704 
2705         spin_lock_irqsave(&info->lock,flags);
2706 
2707         reset_port(info);
2708 
2709         if (!info->port.tty || info->port.tty->termios.c_cflag & HUPCL) {
2710                 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
2711                 set_signals(info);
2712         }
2713 
2714         spin_unlock_irqrestore(&info->lock,flags);
2715 
2716         if (info->port.tty)
2717                 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
2718 
2719         info->port.flags &= ~ASYNC_INITIALIZED;
2720 }
2721 
2722 static void program_hw(SLMP_INFO *info)
2723 {
2724         unsigned long flags;
2725 
2726         spin_lock_irqsave(&info->lock,flags);
2727 
2728         rx_stop(info);
2729         tx_stop(info);
2730 
2731         info->tx_count = info->tx_put = info->tx_get = 0;
2732 
2733         if (info->params.mode == MGSL_MODE_HDLC || info->netcount)
2734                 hdlc_mode(info);
2735         else
2736                 async_mode(info);
2737 
2738         set_signals(info);
2739 
2740         info->dcd_chkcount = 0;
2741         info->cts_chkcount = 0;
2742         info->ri_chkcount = 0;
2743         info->dsr_chkcount = 0;
2744 
2745         info->ie1_value |= (CDCD|CCTS);
2746         write_reg(info, IE1, info->ie1_value);
2747 
2748         get_signals(info);
2749 
2750         if (info->netcount || (info->port.tty && info->port.tty->termios.c_cflag & CREAD) )
2751                 rx_start(info);
2752 
2753         spin_unlock_irqrestore(&info->lock,flags);
2754 }
2755 
2756 /* Reconfigure adapter based on new parameters
2757  */
2758 static void change_params(SLMP_INFO *info)
2759 {
2760         unsigned cflag;
2761         int bits_per_char;
2762 
2763         if (!info->port.tty)
2764                 return;
2765 
2766         if (debug_level >= DEBUG_LEVEL_INFO)
2767                 printk("%s(%d):%s change_params()\n",
2768                          __FILE__,__LINE__, info->device_name );
2769 
2770         cflag = info->port.tty->termios.c_cflag;
2771 
2772         /* if B0 rate (hangup) specified then negate RTS and DTR */
2773         /* otherwise assert RTS and DTR */
2774         if (cflag & CBAUD)
2775                 info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR;
2776         else
2777                 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
2778 
2779         /* byte size and parity */
2780 
2781         switch (cflag & CSIZE) {
2782               case CS5: info->params.data_bits = 5; break;
2783               case CS6: info->params.data_bits = 6; break;
2784               case CS7: info->params.data_bits = 7; break;
2785               case CS8: info->params.data_bits = 8; break;
2786               /* Never happens, but GCC is too dumb to figure it out */
2787               default:  info->params.data_bits = 7; break;
2788               }
2789 
2790         if (cflag & CSTOPB)
2791                 info->params.stop_bits = 2;
2792         else
2793                 info->params.stop_bits = 1;
2794 
2795         info->params.parity = ASYNC_PARITY_NONE;
2796         if (cflag & PARENB) {
2797                 if (cflag & PARODD)
2798                         info->params.parity = ASYNC_PARITY_ODD;
2799                 else
2800                         info->params.parity = ASYNC_PARITY_EVEN;
2801 #ifdef CMSPAR
2802                 if (cflag & CMSPAR)
2803                         info->params.parity = ASYNC_PARITY_SPACE;
2804 #endif
2805         }
2806 
2807         /* calculate number of jiffies to transmit a full
2808          * FIFO (32 bytes) at specified data rate
2809          */
2810         bits_per_char = info->params.data_bits +
2811                         info->params.stop_bits + 1;
2812 
2813         /* if port data rate is set to 460800 or less then
2814          * allow tty settings to override, otherwise keep the
2815          * current data rate.
2816          */
2817         if (info->params.data_rate <= 460800) {
2818                 info->params.data_rate = tty_get_baud_rate(info->port.tty);
2819         }
2820 
2821         if ( info->params.data_rate ) {
2822                 info->timeout = (32*HZ*bits_per_char) /
2823                                 info->params.data_rate;
2824         }
2825         info->timeout += HZ/50;         /* Add .02 seconds of slop */
2826 
2827         if (cflag & CRTSCTS)
2828                 info->port.flags |= ASYNC_CTS_FLOW;
2829         else
2830                 info->port.flags &= ~ASYNC_CTS_FLOW;
2831 
2832         if (cflag & CLOCAL)
2833                 info->port.flags &= ~ASYNC_CHECK_CD;
2834         else
2835                 info->port.flags |= ASYNC_CHECK_CD;
2836 
2837         /* process tty input control flags */
2838 
2839         info->read_status_mask2 = OVRN;
2840         if (I_INPCK(info->port.tty))
2841                 info->read_status_mask2 |= PE | FRME;
2842         if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty))
2843                 info->read_status_mask1 |= BRKD;
2844         if (I_IGNPAR(info->port.tty))
2845                 info->ignore_status_mask2 |= PE | FRME;
2846         if (I_IGNBRK(info->port.tty)) {
2847                 info->ignore_status_mask1 |= BRKD;
2848                 /* If ignoring parity and break indicators, ignore
2849                  * overruns too.  (For real raw support).
2850                  */
2851                 if (I_IGNPAR(info->port.tty))
2852                         info->ignore_status_mask2 |= OVRN;
2853         }
2854 
2855         program_hw(info);
2856 }
2857 
2858 static int get_stats(SLMP_INFO * info, struct mgsl_icount __user *user_icount)
2859 {
2860         int err;
2861 
2862         if (debug_level >= DEBUG_LEVEL_INFO)
2863                 printk("%s(%d):%s get_params()\n",
2864                          __FILE__,__LINE__, info->device_name);
2865 
2866         if (!user_icount) {
2867                 memset(&info->icount, 0, sizeof(info->icount));
2868         } else {
2869                 mutex_lock(&info->port.mutex);
2870                 COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
2871                 mutex_unlock(&info->port.mutex);
2872                 if (err)
2873                         return -EFAULT;
2874         }
2875 
2876         return 0;
2877 }
2878 
2879 static int get_params(SLMP_INFO * info, MGSL_PARAMS __user *user_params)
2880 {
2881         int err;
2882         if (debug_level >= DEBUG_LEVEL_INFO)
2883                 printk("%s(%d):%s get_params()\n",
2884                          __FILE__,__LINE__, info->device_name);
2885 
2886         mutex_lock(&info->port.mutex);
2887         COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
2888         mutex_unlock(&info->port.mutex);
2889         if (err) {
2890                 if ( debug_level >= DEBUG_LEVEL_INFO )
2891                         printk( "%s(%d):%s get_params() user buffer copy failed\n",
2892                                 __FILE__,__LINE__,info->device_name);
2893                 return -EFAULT;
2894         }
2895 
2896         return 0;
2897 }
2898 
2899 static int set_params(SLMP_INFO * info, MGSL_PARAMS __user *new_params)
2900 {
2901         unsigned long flags;
2902         MGSL_PARAMS tmp_params;
2903         int err;
2904 
2905         if (debug_level >= DEBUG_LEVEL_INFO)
2906                 printk("%s(%d):%s set_params\n",
2907                         __FILE__,__LINE__,info->device_name );
2908         COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
2909         if (err) {
2910                 if ( debug_level >= DEBUG_LEVEL_INFO )
2911                         printk( "%s(%d):%s set_params() user buffer copy failed\n",
2912                                 __FILE__,__LINE__,info->device_name);
2913                 return -EFAULT;
2914         }
2915 
2916         mutex_lock(&info->port.mutex);
2917         spin_lock_irqsave(&info->lock,flags);
2918         memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
2919         spin_unlock_irqrestore(&info->lock,flags);
2920 
2921         change_params(info);
2922         mutex_unlock(&info->port.mutex);
2923 
2924         return 0;
2925 }
2926 
2927 static int get_txidle(SLMP_INFO * info, int __user *idle_mode)
2928 {
2929         int err;
2930 
2931         if (debug_level >= DEBUG_LEVEL_INFO)
2932                 printk("%s(%d):%s get_txidle()=%d\n",
2933                          __FILE__,__LINE__, info->device_name, info->idle_mode);
2934 
2935         COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
2936         if (err) {
2937                 if ( debug_level >= DEBUG_LEVEL_INFO )
2938                         printk( "%s(%d):%s get_txidle() user buffer copy failed\n",
2939                                 __FILE__,__LINE__,info->device_name);
2940                 return -EFAULT;
2941         }
2942 
2943         return 0;
2944 }
2945 
2946 static int set_txidle(SLMP_INFO * info, int idle_mode)
2947 {
2948         unsigned long flags;
2949 
2950         if (debug_level >= DEBUG_LEVEL_INFO)
2951                 printk("%s(%d):%s set_txidle(%d)\n",
2952                         __FILE__,__LINE__,info->device_name, idle_mode );
2953 
2954         spin_lock_irqsave(&info->lock,flags);
2955         info->idle_mode = idle_mode;
2956         tx_set_idle( info );
2957         spin_unlock_irqrestore(&info->lock,flags);
2958         return 0;
2959 }
2960 
2961 static int tx_enable(SLMP_INFO * info, int enable)
2962 {
2963         unsigned long flags;
2964 
2965         if (debug_level >= DEBUG_LEVEL_INFO)
2966                 printk("%s(%d):%s tx_enable(%d)\n",
2967                         __FILE__,__LINE__,info->device_name, enable);
2968 
2969         spin_lock_irqsave(&info->lock,flags);
2970         if ( enable ) {
2971                 if ( !info->tx_enabled ) {
2972                         tx_start(info);
2973                 }
2974         } else {
2975                 if ( info->tx_enabled )
2976                         tx_stop(info);
2977         }
2978         spin_unlock_irqrestore(&info->lock,flags);
2979         return 0;
2980 }
2981 
2982 /* abort send HDLC frame
2983  */
2984 static int tx_abort(SLMP_INFO * info)
2985 {
2986         unsigned long flags;
2987 
2988         if (debug_level >= DEBUG_LEVEL_INFO)
2989                 printk("%s(%d):%s tx_abort()\n",
2990                         __FILE__,__LINE__,info->device_name);
2991 
2992         spin_lock_irqsave(&info->lock,flags);
2993         if ( info->tx_active && info->params.mode == MGSL_MODE_HDLC ) {
2994                 info->ie1_value &= ~UDRN;
2995                 info->ie1_value |= IDLE;
2996                 write_reg(info, IE1, info->ie1_value);  /* disable tx status interrupts */
2997                 write_reg(info, SR1, (unsigned char)(IDLE + UDRN));     /* clear pending */
2998 
2999                 write_reg(info, TXDMA + DSR, 0);                /* disable DMA channel */
3000                 write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
3001 
3002                 write_reg(info, CMD, TXABORT);
3003         }
3004         spin_unlock_irqrestore(&info->lock,flags);
3005         return 0;
3006 }
3007 
3008 static int rx_enable(SLMP_INFO * info, int enable)
3009 {
3010         unsigned long flags;
3011 
3012         if (debug_level >= DEBUG_LEVEL_INFO)
3013                 printk("%s(%d):%s rx_enable(%d)\n",
3014                         __FILE__,__LINE__,info->device_name,enable);
3015 
3016         spin_lock_irqsave(&info->lock,flags);
3017         if ( enable ) {
3018                 if ( !info->rx_enabled )
3019                         rx_start(info);
3020         } else {
3021                 if ( info->rx_enabled )
3022                         rx_stop(info);
3023         }
3024         spin_unlock_irqrestore(&info->lock,flags);
3025         return 0;
3026 }
3027 
3028 /* wait for specified event to occur
3029  */
3030 static int wait_mgsl_event(SLMP_INFO * info, int __user *mask_ptr)
3031 {
3032         unsigned long flags;
3033         int s;
3034         int rc=0;
3035         struct mgsl_icount cprev, cnow;
3036         int events;
3037         int mask;
3038         struct  _input_signal_events oldsigs, newsigs;
3039         DECLARE_WAITQUEUE(wait, current);
3040 
3041         COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
3042         if (rc) {
3043                 return  -EFAULT;
3044         }
3045 
3046         if (debug_level >= DEBUG_LEVEL_INFO)
3047                 printk("%s(%d):%s wait_mgsl_event(%d)\n",
3048                         __FILE__,__LINE__,info->device_name,mask);
3049 
3050         spin_lock_irqsave(&info->lock,flags);
3051 
3052         /* return immediately if state matches requested events */
3053         get_signals(info);
3054         s = info->serial_signals;
3055 
3056         events = mask &
3057                 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
3058                   ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
3059                   ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
3060                   ((s & SerialSignal_RI)  ? MgslEvent_RiActive :MgslEvent_RiInactive) );
3061         if (events) {
3062                 spin_unlock_irqrestore(&info->lock,flags);
3063                 goto exit;
3064         }
3065 
3066         /* save current irq counts */
3067         cprev = info->icount;
3068         oldsigs = info->input_signal_events;
3069 
3070         /* enable hunt and idle irqs if needed */
3071         if (mask & (MgslEvent_ExitHuntMode+MgslEvent_IdleReceived)) {
3072                 unsigned char oldval = info->ie1_value;
3073                 unsigned char newval = oldval +
3074                          (mask & MgslEvent_ExitHuntMode ? FLGD:0) +
3075                          (mask & MgslEvent_IdleReceived ? IDLD:0);
3076                 if ( oldval != newval ) {
3077                         info->ie1_value = newval;
3078                         write_reg(info, IE1, info->ie1_value);
3079                 }
3080         }
3081 
3082         set_current_state(TASK_INTERRUPTIBLE);
3083         add_wait_queue(&info->event_wait_q, &wait);
3084 
3085         spin_unlock_irqrestore(&info->lock,flags);
3086 
3087         for(;;) {
3088                 schedule();
3089                 if (signal_pending(current)) {
3090                         rc = -ERESTARTSYS;
3091                         break;
3092                 }
3093 
3094                 /* get current irq counts */
3095                 spin_lock_irqsave(&info->lock,flags);
3096                 cnow = info->icount;
3097                 newsigs = info->input_signal_events;
3098                 set_current_state(TASK_INTERRUPTIBLE);
3099                 spin_unlock_irqrestore(&info->lock,flags);
3100 
3101                 /* if no change, wait aborted for some reason */
3102                 if (newsigs.dsr_up   == oldsigs.dsr_up   &&
3103                     newsigs.dsr_down == oldsigs.dsr_down &&
3104                     newsigs.dcd_up   == oldsigs.dcd_up   &&
3105                     newsigs.dcd_down == oldsigs.dcd_down &&
3106                     newsigs.cts_up   == oldsigs.cts_up   &&
3107                     newsigs.cts_down == oldsigs.cts_down &&
3108                     newsigs.ri_up    == oldsigs.ri_up    &&
3109                     newsigs.ri_down  == oldsigs.ri_down  &&
3110                     cnow.exithunt    == cprev.exithunt   &&
3111                     cnow.rxidle      == cprev.rxidle) {
3112                         rc = -EIO;
3113                         break;
3114                 }
3115 
3116                 events = mask &
3117                         ( (newsigs.dsr_up   != oldsigs.dsr_up   ? MgslEvent_DsrActive:0)   +
3118                           (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
3119                           (newsigs.dcd_up   != oldsigs.dcd_up   ? MgslEvent_DcdActive:0)   +
3120                           (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
3121                           (newsigs.cts_up   != oldsigs.cts_up   ? MgslEvent_CtsActive:0)   +
3122                           (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
3123                           (newsigs.ri_up    != oldsigs.ri_up    ? MgslEvent_RiActive:0)    +
3124                           (newsigs.ri_down  != oldsigs.ri_down  ? MgslEvent_RiInactive:0)  +
3125                           (cnow.exithunt    != cprev.exithunt   ? MgslEvent_ExitHuntMode:0) +
3126                           (cnow.rxidle      != cprev.rxidle     ? MgslEvent_IdleReceived:0) );
3127                 if (events)
3128                         break;
3129 
3130                 cprev = cnow;
3131                 oldsigs = newsigs;
3132         }
3133 
3134         remove_wait_queue(&info->event_wait_q, &wait);
3135         set_current_state(TASK_RUNNING);
3136 
3137 
3138         if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
3139                 spin_lock_irqsave(&info->lock,flags);
3140                 if (!waitqueue_active(&info->event_wait_q)) {
3141                         /* disable enable exit hunt mode/idle rcvd IRQs */
3142                         info->ie1_value &= ~(FLGD|IDLD);
3143                         write_reg(info, IE1, info->ie1_value);
3144                 }
3145                 spin_unlock_irqrestore(&info->lock,flags);
3146         }
3147 exit:
3148         if ( rc == 0 )
3149                 PUT_USER(rc, events, mask_ptr);
3150 
3151         return rc;
3152 }
3153 
3154 static int modem_input_wait(SLMP_INFO *info,int arg)
3155 {
3156         unsigned long flags;
3157         int rc;
3158         struct mgsl_icount cprev, cnow;
3159         DECLARE_WAITQUEUE(wait, current);
3160 
3161         /* save current irq counts */
3162         spin_lock_irqsave(&info->lock,flags);
3163         cprev = info->icount;
3164         add_wait_queue(&info->status_event_wait_q, &wait);
3165         set_current_state(TASK_INTERRUPTIBLE);
3166         spin_unlock_irqrestore(&info->lock,flags);
3167 
3168         for(;;) {
3169                 schedule();
3170                 if (signal_pending(current)) {
3171                         rc = -ERESTARTSYS;
3172                         break;
3173                 }
3174 
3175                 /* get new irq counts */
3176                 spin_lock_irqsave(&info->lock,flags);
3177                 cnow = info->icount;
3178                 set_current_state(TASK_INTERRUPTIBLE);
3179                 spin_unlock_irqrestore(&info->lock,flags);
3180 
3181                 /* if no change, wait aborted for some reason */
3182                 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
3183                     cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
3184                         rc = -EIO;
3185                         break;
3186                 }
3187 
3188                 /* check for change in caller specified modem input */
3189                 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
3190                     (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
3191                     (arg & TIOCM_CD  && cnow.dcd != cprev.dcd) ||
3192                     (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
3193                         rc = 0;
3194                         break;
3195                 }
3196 
3197                 cprev = cnow;
3198         }
3199         remove_wait_queue(&info->status_event_wait_q, &wait);
3200         set_current_state(TASK_RUNNING);
3201         return rc;
3202 }
3203 
3204 /* return the state of the serial control and status signals
3205  */
3206 static int tiocmget(struct tty_struct *tty)
3207 {
3208         SLMP_INFO *info = tty->driver_data;
3209         unsigned int result;
3210         unsigned long flags;
3211 
3212         spin_lock_irqsave(&info->lock,flags);
3213         get_signals(info);
3214         spin_unlock_irqrestore(&info->lock,flags);
3215 
3216         result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS : 0) |
3217                  ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR : 0) |
3218                  ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR : 0) |
3219                  ((info->serial_signals & SerialSignal_RI)  ? TIOCM_RNG : 0) |
3220                  ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR : 0) |
3221                  ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS : 0);
3222 
3223         if (debug_level >= DEBUG_LEVEL_INFO)
3224                 printk("%s(%d):%s tiocmget() value=%08X\n",
3225                          __FILE__,__LINE__, info->device_name, result );
3226         return result;
3227 }
3228 
3229 /* set modem control signals (DTR/RTS)
3230  */
3231 static int tiocmset(struct tty_struct *tty,
3232                                         unsigned int set, unsigned int clear)
3233 {
3234         SLMP_INFO *info = tty->driver_data;
3235         unsigned long flags;
3236 
3237         if (debug_level >= DEBUG_LEVEL_INFO)
3238                 printk("%s(%d):%s tiocmset(%x,%x)\n",
3239                         __FILE__,__LINE__,info->device_name, set, clear);
3240 
3241         if (set & TIOCM_RTS)
3242                 info->serial_signals |= SerialSignal_RTS;
3243         if (set & TIOCM_DTR)
3244                 info->serial_signals |= SerialSignal_DTR;
3245         if (clear & TIOCM_RTS)
3246                 info->serial_signals &= ~SerialSignal_RTS;
3247         if (clear & TIOCM_DTR)
3248                 info->serial_signals &= ~SerialSignal_DTR;
3249 
3250         spin_lock_irqsave(&info->lock,flags);
3251         set_signals(info);
3252         spin_unlock_irqrestore(&info->lock,flags);
3253 
3254         return 0;
3255 }
3256 
3257 static int carrier_raised(struct tty_port *port)
3258 {
3259         SLMP_INFO *info = container_of(port, SLMP_INFO, port);
3260         unsigned long flags;
3261 
3262         spin_lock_irqsave(&info->lock,flags);
3263         get_signals(info);
3264         spin_unlock_irqrestore(&info->lock,flags);
3265 
3266         return (info->serial_signals & SerialSignal_DCD) ? 1 : 0;
3267 }
3268 
3269 static void dtr_rts(struct tty_port *port, int on)
3270 {
3271         SLMP_INFO *info = container_of(port, SLMP_INFO, port);
3272         unsigned long flags;
3273 
3274         spin_lock_irqsave(&info->lock,flags);
3275         if (on)
3276                 info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR;
3277         else
3278                 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
3279         set_signals(info);
3280         spin_unlock_irqrestore(&info->lock,flags);
3281 }
3282 
3283 /* Block the current process until the specified port is ready to open.
3284  */
3285 static int block_til_ready(struct tty_struct *tty, struct file *filp,
3286                            SLMP_INFO *info)
3287 {
3288         DECLARE_WAITQUEUE(wait, current);
3289         int             retval;
3290         bool            do_clocal = false;
3291         unsigned long   flags;
3292         int             cd;
3293         struct tty_port *port = &info->port;
3294 
3295         if (debug_level >= DEBUG_LEVEL_INFO)
3296                 printk("%s(%d):%s block_til_ready()\n",
3297                          __FILE__,__LINE__, tty->driver->name );
3298 
3299         if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
3300                 /* nonblock mode is set or port is not enabled */
3301                 /* just verify that callout device is not active */
3302                 port->flags |= ASYNC_NORMAL_ACTIVE;
3303                 return 0;
3304         }
3305 
3306         if (tty->termios.c_cflag & CLOCAL)
3307                 do_clocal = true;
3308 
3309         /* Wait for carrier detect and the line to become
3310          * free (i.e., not in use by the callout).  While we are in
3311          * this loop, port->count is dropped by one, so that
3312          * close() knows when to free things.  We restore it upon
3313          * exit, either normal or abnormal.
3314          */
3315 
3316         retval = 0;
3317         add_wait_queue(&port->open_wait, &wait);
3318 
3319         if (debug_level >= DEBUG_LEVEL_INFO)
3320                 printk("%s(%d):%s block_til_ready() before block, count=%d\n",
3321                          __FILE__,__LINE__, tty->driver->name, port->count );
3322 
3323         spin_lock_irqsave(&info->lock, flags);
3324         port->count--;
3325         spin_unlock_irqrestore(&info->lock, flags);
3326         port->blocked_open++;
3327 
3328         while (1) {
3329                 if (C_BAUD(tty) && test_bit(ASYNCB_INITIALIZED, &port->flags))
3330                         tty_port_raise_dtr_rts(port);
3331 
3332                 set_current_state(TASK_INTERRUPTIBLE);
3333 
3334                 if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)){
3335                         retval = (port->flags & ASYNC_HUP_NOTIFY) ?
3336                                         -EAGAIN : -ERESTARTSYS;
3337                         break;
3338                 }
3339 
3340                 cd = tty_port_carrier_raised(port);
3341 
3342                 if (!(port->flags & ASYNC_CLOSING) && (do_clocal || cd))
3343                         break;
3344 
3345                 if (signal_pending(current)) {
3346                         retval = -ERESTARTSYS;
3347                         break;
3348                 }
3349 
3350                 if (debug_level >= DEBUG_LEVEL_INFO)
3351                         printk("%s(%d):%s block_til_ready() count=%d\n",
3352                                  __FILE__,__LINE__, tty->driver->name, port->count );
3353 
3354                 tty_unlock(tty);
3355                 schedule();
3356                 tty_lock(tty);
3357         }
3358 
3359         set_current_state(TASK_RUNNING);
3360         remove_wait_queue(&port->open_wait, &wait);
3361         if (!tty_hung_up_p(filp))
3362                 port->count++;
3363         port->blocked_open--;
3364 
3365         if (debug_level >= DEBUG_LEVEL_INFO)
3366                 printk("%s(%d):%s block_til_ready() after, count=%d\n",
3367                          __FILE__,__LINE__, tty->driver->name, port->count );
3368 
3369         if (!retval)
3370                 port->flags |= ASYNC_NORMAL_ACTIVE;
3371 
3372         return retval;
3373 }
3374 
3375 static int alloc_dma_bufs(SLMP_INFO *info)
3376 {
3377         unsigned short BuffersPerFrame;
3378         unsigned short BufferCount;
3379 
3380         // Force allocation to start at 64K boundary for each port.
3381         // This is necessary because *all* buffer descriptors for a port
3382         // *must* be in the same 64K block. All descriptors on a port
3383         // share a common 'base' address (upper 8 bits of 24 bits) programmed
3384         // into the CBP register.
3385         info->port_array[0]->last_mem_alloc = (SCA_MEM_SIZE/4) * info->port_num;
3386 
3387         /* Calculate the number of DMA buffers necessary to hold the */
3388         /* largest allowable frame size. Note: If the max frame size is */
3389         /* not an even multiple of the DMA buffer size then we need to */
3390         /* round the buffer count per frame up one. */
3391 
3392         BuffersPerFrame = (unsigned short)(info->max_frame_size/SCABUFSIZE);
3393         if ( info->max_frame_size % SCABUFSIZE )
3394                 BuffersPerFrame++;
3395 
3396         /* calculate total number of data buffers (SCABUFSIZE) possible
3397          * in one ports memory (SCA_MEM_SIZE/4) after allocating memory
3398          * for the descriptor list (BUFFERLISTSIZE).
3399          */
3400         BufferCount = (SCA_MEM_SIZE/4 - BUFFERLISTSIZE)/SCABUFSIZE;
3401 
3402         /* limit number of buffers to maximum amount of descriptors */
3403         if (BufferCount > BUFFERLISTSIZE/sizeof(SCADESC))
3404                 BufferCount = BUFFERLISTSIZE/sizeof(SCADESC);
3405 
3406         /* use enough buffers to transmit one max size frame */
3407         info->tx_buf_count = BuffersPerFrame + 1;
3408 
3409         /* never use more than half the available buffers for transmit */
3410         if (info->tx_buf_count > (BufferCount/2))
3411                 info->tx_buf_count = BufferCount/2;
3412 
3413         if (info->tx_buf_count > SCAMAXDESC)
3414                 info->tx_buf_count = SCAMAXDESC;
3415 
3416         /* use remaining buffers for receive */
3417         info->rx_buf_count = BufferCount - info->tx_buf_count;
3418 
3419         if (info->rx_buf_count > SCAMAXDESC)
3420                 info->rx_buf_count = SCAMAXDESC;
3421 
3422         if ( debug_level >= DEBUG_LEVEL_INFO )
3423                 printk("%s(%d):%s Allocating %d TX and %d RX DMA buffers.\n",
3424                         __FILE__,__LINE__, info->device_name,
3425                         info->tx_buf_count,info->rx_buf_count);
3426 
3427         if ( alloc_buf_list( info ) < 0 ||
3428                 alloc_frame_bufs(info,
3429                                         info->rx_buf_list,
3430                                         info->rx_buf_list_ex,
3431                                         info->rx_buf_count) < 0 ||
3432                 alloc_frame_bufs(info,
3433                                         info->tx_buf_list,
3434                                         info->tx_buf_list_ex,
3435                                         info->tx_buf_count) < 0 ||
3436                 alloc_tmp_rx_buf(info) < 0 ) {
3437                 printk("%s(%d):%s Can't allocate DMA buffer memory\n",
3438                         __FILE__,__LINE__, info->device_name);
3439                 return -ENOMEM;
3440         }
3441 
3442         rx_reset_buffers( info );
3443 
3444         return 0;
3445 }
3446 
3447 /* Allocate DMA buffers for the transmit and receive descriptor lists.
3448  */
3449 static int alloc_buf_list(SLMP_INFO *info)
3450 {
3451         unsigned int i;
3452 
3453         /* build list in adapter shared memory */
3454         info->buffer_list = info->memory_base + info->port_array[0]->last_mem_alloc;
3455         info->buffer_list_phys = info->port_array[0]->last_mem_alloc;
3456         info->port_array[0]->last_mem_alloc += BUFFERLISTSIZE;
3457 
3458         memset(info->buffer_list, 0, BUFFERLISTSIZE);
3459 
3460         /* Save virtual address pointers to the receive and */
3461         /* transmit buffer lists. (Receive 1st). These pointers will */
3462         /* be used by the processor to access the lists. */
3463         info->rx_buf_list = (SCADESC *)info->buffer_list;
3464 
3465         info->tx_buf_list = (SCADESC *)info->buffer_list;
3466         info->tx_buf_list += info->rx_buf_count;
3467 
3468         /* Build links for circular buffer entry lists (tx and rx)
3469          *
3470          * Note: links are physical addresses read by the SCA device
3471          * to determine the next buffer entry to use.
3472          */
3473 
3474         for ( i = 0; i < info->rx_buf_count; i++ ) {
3475                 /* calculate and store physical address of this buffer entry */
3476                 info->rx_buf_list_ex[i].phys_entry =
3477                         info->buffer_list_phys + (i * SCABUFSIZE);
3478 
3479                 /* calculate and store physical address of */
3480                 /* next entry in cirular list of entries */
3481                 info->rx_buf_list[i].next = info->buffer_list_phys;
3482                 if ( i < info->rx_buf_count - 1 )
3483                         info->rx_buf_list[i].next += (i + 1) * sizeof(SCADESC);
3484 
3485                 info->rx_buf_list[i].length = SCABUFSIZE;
3486         }
3487 
3488         for ( i = 0; i < info->tx_buf_count; i++ ) {
3489                 /* calculate and store physical address of this buffer entry */
3490                 info->tx_buf_list_ex[i].phys_entry = info->buffer_list_phys +
3491                         ((info->rx_buf_count + i) * sizeof(SCADESC));
3492 
3493                 /* calculate and store physical address of */
3494                 /* next entry in cirular list of entries */
3495 
3496                 info->tx_buf_list[i].next = info->buffer_list_phys +
3497                         info->rx_buf_count * sizeof(SCADESC);
3498 
3499                 if ( i < info->tx_buf_count - 1 )
3500                         info->tx_buf_list[i].next += (i + 1) * sizeof(SCADESC);
3501         }
3502 
3503         return 0;
3504 }
3505 
3506 /* Allocate the frame DMA buffers used by the specified buffer list.
3507  */
3508 static int alloc_frame_bufs(SLMP_INFO *info, SCADESC *buf_list,SCADESC_EX *buf_list_ex,int count)
3509 {
3510         int i;
3511         unsigned long phys_addr;
3512 
3513         for ( i = 0; i < count; i++ ) {
3514                 buf_list_ex[i].virt_addr = info->memory_base + info->port_array[0]->last_mem_alloc;
3515                 phys_addr = info->port_array[0]->last_mem_alloc;
3516                 info->port_array[0]->last_mem_alloc += SCABUFSIZE;
3517 
3518                 buf_list[i].buf_ptr  = (unsigned short)phys_addr;
3519                 buf_list[i].buf_base = (unsigned char)(phys_addr >> 16);
3520         }
3521 
3522         return 0;
3523 }
3524 
3525 static void free_dma_bufs(SLMP_INFO *info)
3526 {
3527         info->buffer_list = NULL;
3528         info->rx_buf_list = NULL;
3529         info->tx_buf_list = NULL;
3530 }
3531 
3532 /* allocate buffer large enough to hold max_frame_size.
3533  * This buffer is used to pass an assembled frame to the line discipline.
3534  */
3535 static int alloc_tmp_rx_buf(SLMP_INFO *info)
3536 {
3537         info->tmp_rx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
3538         if (info->tmp_rx_buf == NULL)
3539                 return -ENOMEM;
3540         /* unused flag buffer to satisfy receive_buf calling interface */
3541         info->flag_buf = kzalloc(info->max_frame_size, GFP_KERNEL);
3542         if (!info->flag_buf) {
3543                 kfree(info->tmp_rx_buf);
3544                 info->tmp_rx_buf = NULL;
3545                 return -ENOMEM;
3546         }
3547         return 0;
3548 }
3549 
3550 static void free_tmp_rx_buf(SLMP_INFO *info)
3551 {
3552         kfree(info->tmp_rx_buf);
3553         info->tmp_rx_buf = NULL;
3554         kfree(info->flag_buf);
3555         info->flag_buf = NULL;
3556 }
3557 
3558 static int claim_resources(SLMP_INFO *info)
3559 {
3560         if (request_mem_region(info->phys_memory_base,SCA_MEM_SIZE,"synclinkmp") == NULL) {
3561                 printk( "%s(%d):%s mem addr conflict, Addr=%08X\n",
3562                         __FILE__,__LINE__,info->device_name, info->phys_memory_base);
3563                 info->init_error = DiagStatus_AddressConflict;
3564                 goto errout;
3565         }
3566         else
3567                 info->shared_mem_requested = true;
3568 
3569         if (request_mem_region(info->phys_lcr_base + info->lcr_offset,128,"synclinkmp") == NULL) {
3570                 printk( "%s(%d):%s lcr mem addr conflict, Addr=%08X\n",
3571                         __FILE__,__LINE__,info->device_name, info->phys_lcr_base);
3572                 info->init_error = DiagStatus_AddressConflict;
3573                 goto errout;
3574         }
3575         else
3576                 info->lcr_mem_requested = true;
3577 
3578         if (request_mem_region(info->phys_sca_base + info->sca_offset,SCA_BASE_SIZE,"synclinkmp") == NULL) {
3579                 printk( "%s(%d):%s sca mem addr conflict, Addr=%08X\n",
3580                         __FILE__,__LINE__,info->device_name, info->phys_sca_base);
3581                 info->init_error = DiagStatus_AddressConflict;
3582                 goto errout;
3583         }
3584         else
3585                 info->sca_base_requested = true;
3586 
3587         if (request_mem_region(info->phys_statctrl_base + info->statctrl_offset,SCA_REG_SIZE,"synclinkmp") == NULL) {
3588                 printk( "%s(%d):%s stat/ctrl mem addr conflict, Addr=%08X\n",
3589                         __FILE__,__LINE__,info->device_name, info->phys_statctrl_base);
3590                 info->init_error = DiagStatus_AddressConflict;
3591                 goto errout;
3592         }
3593         else
3594                 info->sca_statctrl_requested = true;
3595 
3596         info->memory_base = ioremap_nocache(info->phys_memory_base,
3597                                                                 SCA_MEM_SIZE);
3598         if (!info->memory_base) {
3599                 printk( "%s(%d):%s Can't map shared memory, MemAddr=%08X\n",
3600                         __FILE__,__LINE__,info->device_name, info->phys_memory_base );
3601                 info->init_error = DiagStatus_CantAssignPciResources;
3602                 goto errout;
3603         }
3604 
3605         info->lcr_base = ioremap_nocache(info->phys_lcr_base, PAGE_SIZE);
3606         if (!info->lcr_base) {
3607                 printk( "%s(%d):%s Can't map LCR memory, MemAddr=%08X\n",
3608                         __FILE__,__LINE__,info->device_name, info->phys_lcr_base );
3609                 info->init_error = DiagStatus_CantAssignPciResources;
3610                 goto errout;
3611         }
3612         info->lcr_base += info->lcr_offset;
3613 
3614         info->sca_base = ioremap_nocache(info->phys_sca_base, PAGE_SIZE);
3615         if (!info->sca_base) {
3616                 printk( "%s(%d):%s Can't map SCA memory, MemAddr=%08X\n",
3617                         __FILE__,__LINE__,info->device_name, info->phys_sca_base );
3618                 info->init_error = DiagStatus_CantAssignPciResources;
3619                 goto errout;
3620         }
3621         info->sca_base += info->sca_offset;
3622 
3623         info->statctrl_base = ioremap_nocache(info->phys_statctrl_base,
3624                                                                 PAGE_SIZE);
3625         if (!info->statctrl_base) {
3626                 printk( "%s(%d):%s Can't map SCA Status/Control memory, MemAddr=%08X\n",
3627                         __FILE__,__LINE__,info->device_name, info->phys_statctrl_base );
3628                 info->init_error = DiagStatus_CantAssignPciResources;
3629                 goto errout;
3630         }
3631         info->statctrl_base += info->statctrl_offset;
3632 
3633         if ( !memory_test(info) ) {
3634                 printk( "%s(%d):Shared Memory Test failed for device %s MemAddr=%08X\n",
3635                         __FILE__,__LINE__,info->device_name, info->phys_memory_base );
3636                 info->init_error = DiagStatus_MemoryError;
3637                 goto errout;
3638         }
3639 
3640         return 0;
3641 
3642 errout:
3643         release_resources( info );
3644         return -ENODEV;
3645 }
3646 
3647 static void release_resources(SLMP_INFO *info)
3648 {
3649         if ( debug_level >= DEBUG_LEVEL_INFO )
3650                 printk( "%s(%d):%s release_resources() entry\n",
3651                         __FILE__,__LINE__,info->device_name );
3652 
3653         if ( info->irq_requested ) {
3654                 free_irq(info->irq_level, info);
3655                 info->irq_requested = false;
3656         }
3657 
3658         if ( info->shared_mem_requested ) {
3659                 release_mem_region(info->phys_memory_base,SCA_MEM_SIZE);
3660                 info->shared_mem_requested = false;
3661         }
3662         if ( info->lcr_mem_requested ) {
3663                 release_mem_region(info->phys_lcr_base + info->lcr_offset,128);
3664                 info->lcr_mem_requested = false;
3665         }
3666         if ( info->sca_base_requested ) {
3667                 release_mem_region(info->phys_sca_base + info->sca_offset,SCA_BASE_SIZE);
3668                 info->sca_base_requested = false;
3669         }
3670         if ( info->sca_statctrl_requested ) {
3671                 release_mem_region(info->phys_statctrl_base + info->statctrl_offset,SCA_REG_SIZE);
3672                 info->sca_statctrl_requested = false;
3673         }
3674 
3675         if (info->memory_base){
3676                 iounmap(info->memory_base);
3677                 info->memory_base = NULL;
3678         }
3679 
3680         if (info->sca_base) {
3681                 iounmap(info->sca_base - info->sca_offset);
3682                 info->sca_base=NULL;
3683         }
3684 
3685         if (info->statctrl_base) {
3686                 iounmap(info->statctrl_base - info->statctrl_offset);
3687                 info->statctrl_base=NULL;
3688         }
3689 
3690         if (info->lcr_base){
3691                 iounmap(info->lcr_base - info->lcr_offset);
3692                 info->lcr_base = NULL;
3693         }
3694 
3695         if ( debug_level >= DEBUG_LEVEL_INFO )
3696                 printk( "%s(%d):%s release_resources() exit\n",
3697                         __FILE__,__LINE__,info->device_name );
3698 }
3699 
3700 /* Add the specified device instance data structure to the
3701  * global linked list of devices and increment the device count.
3702  */
3703 static void add_device(SLMP_INFO *info)
3704 {
3705         info->next_device = NULL;
3706         info->line = synclinkmp_device_count;
3707         sprintf(info->device_name,"ttySLM%dp%d",info->adapter_num,info->port_num);
3708 
3709         if (info->line < MAX_DEVICES) {
3710                 if (maxframe[info->line])
3711                         info->max_frame_size = maxframe[info->line];
3712         }
3713 
3714         synclinkmp_device_count++;
3715 
3716         if ( !synclinkmp_device_list )
3717                 synclinkmp_device_list = info;
3718         else {
3719                 SLMP_INFO *current_dev = synclinkmp_device_list;
3720                 while( current_dev->next_device )
3721                         current_dev = current_dev->next_device;
3722                 current_dev->next_device = info;
3723         }
3724 
3725         if ( info->max_frame_size < 4096 )
3726                 info->max_frame_size = 4096;
3727         else if ( info->max_frame_size > 65535 )
3728                 info->max_frame_size = 65535;
3729 
3730         printk( "SyncLink MultiPort %s: "
3731                 "Mem=(%08x %08X %08x %08X) IRQ=%d MaxFrameSize=%u\n",
3732                 info->device_name,
3733                 info->phys_sca_base,
3734                 info->phys_memory_base,
3735                 info->phys_statctrl_base,
3736                 info->phys_lcr_base,
3737                 info->irq_level,
3738                 info->max_frame_size );
3739 
3740 #if SYNCLINK_GENERIC_HDLC
3741         hdlcdev_init(info);
3742 #endif
3743 }
3744 
3745 static const struct tty_port_operations port_ops = {
3746         .carrier_raised = carrier_raised,
3747         .dtr_rts = dtr_rts,
3748 };
3749 
3750 /* Allocate and initialize a device instance structure
3751  *
3752  * Return Value:        pointer to SLMP_INFO if success, otherwise NULL
3753  */
3754 static SLMP_INFO *alloc_dev(int adapter_num, int port_num, struct pci_dev *pdev)
3755 {
3756         SLMP_INFO *info;
3757 
3758         info = kzalloc(sizeof(SLMP_INFO),
3759                  GFP_KERNEL);
3760 
3761         if (!info) {
3762                 printk("%s(%d) Error can't allocate device instance data for adapter %d, port %d\n",
3763                         __FILE__,__LINE__, adapter_num, port_num);
3764         } else {
3765                 tty_port_init(&info->port);
3766                 info->port.ops = &port_ops;
3767                 info->magic = MGSL_MAGIC;
3768                 INIT_WORK(&info->task, bh_handler);
3769                 info->max_frame_size = 4096;
3770                 info->port.close_delay = 5*HZ/10;
3771                 info->port.closing_wait = 30*HZ;
3772                 init_waitqueue_head(&info->status_event_wait_q);
3773                 init_waitqueue_head(&info->event_wait_q);
3774                 spin_lock_init(&info->netlock);
3775                 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
3776                 info->idle_mode = HDLC_TXIDLE_FLAGS;
3777                 info->adapter_num = adapter_num;
3778                 info->port_num = port_num;
3779 
3780                 /* Copy configuration info to device instance data */
3781                 info->irq_level = pdev->irq;
3782                 info->phys_lcr_base = pci_resource_start(pdev,0);
3783                 info->phys_sca_base = pci_resource_start(pdev,2);
3784                 info->phys_memory_base = pci_resource_start(pdev,3);
3785                 info->phys_statctrl_base = pci_resource_start(pdev,4);
3786 
3787                 /* Because veremap only works on page boundaries we must map
3788                  * a larger area than is actually implemented for the LCR
3789                  * memory range. We map a full page starting at the page boundary.
3790                  */
3791                 info->lcr_offset    = info->phys_lcr_base & (PAGE_SIZE-1);
3792                 info->phys_lcr_base &= ~(PAGE_SIZE-1);
3793 
3794                 info->sca_offset    = info->phys_sca_base & (PAGE_SIZE-1);
3795                 info->phys_sca_base &= ~(PAGE_SIZE-1);
3796 
3797                 info->statctrl_offset    = info->phys_statctrl_base & (PAGE_SIZE-1);
3798                 info->phys_statctrl_base &= ~(PAGE_SIZE-1);
3799 
3800                 info->bus_type = MGSL_BUS_TYPE_PCI;
3801                 info->irq_flags = IRQF_SHARED;
3802 
3803                 setup_timer(&info->tx_timer, tx_timeout, (unsigned long)info);
3804                 setup_timer(&info->status_timer, status_timeout,
3805                                 (unsigned long)info);
3806 
3807                 /* Store the PCI9050 misc control register value because a flaw
3808                  * in the PCI9050 prevents LCR registers from being read if
3809                  * BIOS assigns an LCR base address with bit 7 set.
3810                  *
3811                  * Only the misc control register is accessed for which only
3812                  * write access is needed, so set an initial value and change
3813                  * bits to the device instance data as we write the value
3814                  * to the actual misc control register.
3815                  */
3816                 info->misc_ctrl_value = 0x087e4546;
3817 
3818                 /* initial port state is unknown - if startup errors
3819                  * occur, init_error will be set to indicate the
3820                  * problem. Once the port is fully initialized,
3821                  * this value will be set to 0 to indicate the
3822                  * port is available.
3823                  */
3824                 info->init_error = -1;
3825         }
3826 
3827         return info;
3828 }
3829 
3830 static void device_init(int adapter_num, struct pci_dev *pdev)
3831 {
3832         SLMP_INFO *port_array[SCA_MAX_PORTS];
3833         int port;
3834 
3835         /* allocate device instances for up to SCA_MAX_PORTS devices */
3836         for ( port = 0; port < SCA_MAX_PORTS; ++port ) {
3837                 port_array[port] = alloc_dev(adapter_num,port,pdev);
3838                 if( port_array[port] == NULL ) {
3839                         for (--port; port >= 0; --port) {
3840                                 tty_port_destroy(&port_array[port]->port);
3841                                 kfree(port_array[port]);
3842                         }
3843                         return;
3844                 }
3845         }
3846 
3847         /* give copy of port_array to all ports and add to device list  */
3848         for ( port = 0; port < SCA_MAX_PORTS; ++port ) {
3849                 memcpy(port_array[port]->port_array,port_array,sizeof(port_array));
3850                 add_device( port_array[port] );
3851                 spin_lock_init(&port_array[port]->lock);
3852         }
3853 
3854         /* Allocate and claim adapter resources */
3855         if ( !claim_resources(port_array[0]) ) {
3856 
3857                 alloc_dma_bufs(port_array[0]);
3858 
3859                 /* copy resource information from first port to others */
3860                 for ( port = 1; port < SCA_MAX_PORTS; ++port ) {
3861                         port_array[port]->lock  = port_array[0]->lock;
3862                         port_array[port]->irq_level     = port_array[0]->irq_level;
3863                         port_array[port]->memory_base   = port_array[0]->memory_base;
3864                         port_array[port]->sca_base      = port_array[0]->sca_base;
3865                         port_array[port]->statctrl_base = port_array[0]->statctrl_base;
3866                         port_array[port]->lcr_base      = port_array[0]->lcr_base;
3867                         alloc_dma_bufs(port_array[port]);
3868                 }
3869 
3870                 if ( request_irq(port_array[0]->irq_level,
3871                                         synclinkmp_interrupt,
3872                                         port_array[0]->irq_flags,
3873                                         port_array[0]->device_name,
3874                                         port_array[0]) < 0 ) {
3875                         printk( "%s(%d):%s Can't request interrupt, IRQ=%d\n",
3876                                 __FILE__,__LINE__,
3877                                 port_array[0]->device_name,
3878                                 port_array[0]->irq_level );
3879                 }
3880                 else {
3881                         port_array[0]->irq_requested = true;
3882                         adapter_test(port_array[0]);
3883                 }
3884         }
3885 }
3886 
3887 static const struct tty_operations ops = {
3888         .install = install,
3889         .open = open,
3890         .close = close,
3891         .write = write,
3892         .put_char = put_char,
3893         .flush_chars = flush_chars,
3894         .write_room = write_room,
3895         .chars_in_buffer = chars_in_buffer,
3896         .flush_buffer = flush_buffer,
3897         .ioctl = ioctl,
3898         .throttle = throttle,
3899         .unthrottle = unthrottle,
3900         .send_xchar = send_xchar,
3901         .break_ctl = set_break,
3902         .wait_until_sent = wait_until_sent,
3903         .set_termios = set_termios,
3904         .stop = tx_hold,
3905         .start = tx_release,
3906         .hangup = hangup,
3907         .tiocmget = tiocmget,
3908         .tiocmset = tiocmset,
3909         .get_icount = get_icount,
3910         .proc_fops = &synclinkmp_proc_fops,
3911 };
3912 
3913 
3914 static void synclinkmp_cleanup(void)
3915 {
3916         int rc;
3917         SLMP_INFO *info;
3918         SLMP_INFO *tmp;
3919 
3920         printk("Unloading %s %s\n", driver_name, driver_version);
3921 
3922         if (serial_driver) {
3923                 if ((rc = tty_unregister_driver(serial_driver)))
3924                         printk("%s(%d) failed to unregister tty driver err=%d\n",
3925                                __FILE__,__LINE__,rc);
3926                 put_tty_driver(serial_driver);
3927         }
3928 
3929         /* reset devices */
3930         info = synclinkmp_device_list;
3931         while(info) {
3932                 reset_port(info);
3933                 info = info->next_device;
3934         }
3935 
3936         /* release devices */
3937         info = synclinkmp_device_list;
3938         while(info) {
3939 #if SYNCLINK_GENERIC_HDLC
3940                 hdlcdev_exit(info);
3941 #endif
3942                 free_dma_bufs(info);
3943                 free_tmp_rx_buf(info);
3944                 if ( info->port_num == 0 ) {
3945                         if (info->sca_base)
3946                                 write_reg(info, LPR, 1); /* set low power mode */
3947                         release_resources(info);
3948                 }
3949                 tmp = info;
3950                 info = info->next_device;
3951                 tty_port_destroy(&tmp->port);
3952                 kfree(tmp);
3953         }
3954 
3955         pci_unregister_driver(&synclinkmp_pci_driver);
3956 }
3957 
3958 /* Driver initialization entry point.
3959  */
3960 
3961 static int __init synclinkmp_init(void)
3962 {
3963         int rc;
3964 
3965         if (break_on_load) {
3966                 synclinkmp_get_text_ptr();
3967                 BREAKPOINT();
3968         }
3969 
3970         printk("%s %s\n", driver_name, driver_version);
3971 
3972         if ((rc = pci_register_driver(&synclinkmp_pci_driver)) < 0) {
3973                 printk("%s:failed to register PCI driver, error=%d\n",__FILE__,rc);
3974                 return rc;
3975         }
3976 
3977         serial_driver = alloc_tty_driver(128);
3978         if (!serial_driver) {
3979                 rc = -ENOMEM;
3980                 goto error;
3981         }
3982 
3983         /* Initialize the tty_driver structure */
3984 
3985         serial_driver->driver_name = "synclinkmp";
3986         serial_driver->name = "ttySLM";
3987         serial_driver->major = ttymajor;
3988         serial_driver->minor_start = 64;
3989         serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
3990         serial_driver->subtype = SERIAL_TYPE_NORMAL;
3991         serial_driver->init_termios = tty_std_termios;
3992         serial_driver->init_termios.c_cflag =
3993                 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
3994         serial_driver->init_termios.c_ispeed = 9600;
3995         serial_driver->init_termios.c_ospeed = 9600;
3996         serial_driver->flags = TTY_DRIVER_REAL_RAW;
3997         tty_set_operations(serial_driver, &ops);
3998         if ((rc = tty_register_driver(serial_driver)) < 0) {
3999                 printk("%s(%d):Couldn't register serial driver\n",
4000                         __FILE__,__LINE__);
4001                 put_tty_driver(serial_driver);
4002                 serial_driver = NULL;
4003                 goto error;
4004         }
4005 
4006         printk("%s %s, tty major#%d\n",
4007                 driver_name, driver_version,
4008                 serial_driver->major);
4009 
4010         return 0;
4011 
4012 error:
4013         synclinkmp_cleanup();
4014         return rc;
4015 }
4016 
4017 static void __exit synclinkmp_exit(void)
4018 {
4019         synclinkmp_cleanup();
4020 }
4021 
4022 module_init(synclinkmp_init);
4023 module_exit(synclinkmp_exit);
4024 
4025 /* Set the port for internal loopback mode.
4026  * The TxCLK and RxCLK signals are generated from the BRG and
4027  * the TxD is looped back to the RxD internally.
4028  */
4029 static void enable_loopback(SLMP_INFO *info, int enable)
4030 {
4031         if (enable) {
4032                 /* MD2 (Mode Register 2)
4033                  * 01..00  CNCT<1..0> Channel Connection 11=Local Loopback
4034                  */
4035                 write_reg(info, MD2, (unsigned char)(read_reg(info, MD2) | (BIT1 + BIT0)));
4036 
4037                 /* degate external TxC clock source */
4038                 info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4039                 write_control_reg(info);
4040 
4041                 /* RXS/TXS (Rx/Tx clock source)
4042                  * 07      Reserved, must be 0
4043                  * 06..04  Clock Source, 100=BRG
4044                  * 03..00  Clock Divisor, 0000=1
4045                  */
4046                 write_reg(info, RXS, 0x40);
4047                 write_reg(info, TXS, 0x40);
4048 
4049         } else {
4050                 /* MD2 (Mode Register 2)
4051                  * 01..00  CNCT<1..0> Channel connection, 0=normal
4052                  */
4053                 write_reg(info, MD2, (unsigned char)(read_reg(info, MD2) & ~(BIT1 + BIT0)));
4054 
4055                 /* RXS/TXS (Rx/Tx clock source)
4056                  * 07      Reserved, must be 0
4057                  * 06..04  Clock Source, 000=RxC/TxC Pin
4058                  * 03..00  Clock Divisor, 0000=1
4059                  */
4060                 write_reg(info, RXS, 0x00);
4061                 write_reg(info, TXS, 0x00);
4062         }
4063 
4064         /* set LinkSpeed if available, otherwise default to 2Mbps */
4065         if (info->params.clock_speed)
4066                 set_rate(info, info->params.clock_speed);
4067         else
4068                 set_rate(info, 3686400);
4069 }
4070 
4071 /* Set the baud rate register to the desired speed
4072  *
4073  *      data_rate       data rate of clock in bits per second
4074  *                      A data rate of 0 disables the AUX clock.
4075  */
4076 static void set_rate( SLMP_INFO *info, u32 data_rate )
4077 {
4078         u32 TMCValue;
4079         unsigned char BRValue;
4080         u32 Divisor=0;
4081 
4082         /* fBRG = fCLK/(TMC * 2^BR)
4083          */
4084         if (data_rate != 0) {
4085                 Divisor = 14745600/data_rate;
4086                 if (!Divisor)
4087                         Divisor = 1;
4088 
4089                 TMCValue = Divisor;
4090 
4091                 BRValue = 0;
4092                 if (TMCValue != 1 && TMCValue != 2) {
4093                         /* BRValue of 0 provides 50/50 duty cycle *only* when
4094                          * TMCValue is 1 or 2. BRValue of 1 to 9 always provides
4095                          * 50/50 duty cycle.
4096                          */
4097                         BRValue = 1;
4098                         TMCValue >>= 1;
4099                 }
4100 
4101                 /* while TMCValue is too big for TMC register, divide
4102                  * by 2 and increment BR exponent.
4103                  */
4104                 for(; TMCValue > 256 && BRValue < 10; BRValue++)
4105                         TMCValue >>= 1;
4106 
4107                 write_reg(info, TXS,
4108                         (unsigned char)((read_reg(info, TXS) & 0xf0) | BRValue));
4109                 write_reg(info, RXS,
4110                         (unsigned char)((read_reg(info, RXS) & 0xf0) | BRValue));
4111                 write_reg(info, TMC, (unsigned char)TMCValue);
4112         }
4113         else {
4114                 write_reg(info, TXS,0);
4115                 write_reg(info, RXS,0);
4116                 write_reg(info, TMC, 0);
4117         }
4118 }
4119 
4120 /* Disable receiver
4121  */
4122 static void rx_stop(SLMP_INFO *info)
4123 {
4124         if (debug_level >= DEBUG_LEVEL_ISR)
4125                 printk("%s(%d):%s rx_stop()\n",
4126                          __FILE__,__LINE__, info->device_name );
4127 
4128         write_reg(info, CMD, RXRESET);
4129 
4130         info->ie0_value &= ~RXRDYE;
4131         write_reg(info, IE0, info->ie0_value);  /* disable Rx data interrupts */
4132 
4133         write_reg(info, RXDMA + DSR, 0);        /* disable Rx DMA */
4134         write_reg(info, RXDMA + DCMD, SWABORT); /* reset/init Rx DMA */
4135         write_reg(info, RXDMA + DIR, 0);        /* disable Rx DMA interrupts */
4136 
4137         info->rx_enabled = false;
4138         info->rx_overflow = false;
4139 }
4140 
4141 /* enable the receiver
4142  */
4143 static void rx_start(SLMP_INFO *info)
4144 {
4145         int i;
4146 
4147         if (debug_level >= DEBUG_LEVEL_ISR)
4148                 printk("%s(%d):%s rx_start()\n",
4149                          __FILE__,__LINE__, info->device_name );
4150 
4151         write_reg(info, CMD, RXRESET);
4152 
4153         if ( info->params.mode == MGSL_MODE_HDLC ) {
4154                 /* HDLC, disabe IRQ on rxdata */
4155                 info->ie0_value &= ~RXRDYE;
4156                 write_reg(info, IE0, info->ie0_value);
4157 
4158                 /* Reset all Rx DMA buffers and program rx dma */
4159                 write_reg(info, RXDMA + DSR, 0);                /* disable Rx DMA */
4160                 write_reg(info, RXDMA + DCMD, SWABORT); /* reset/init Rx DMA */
4161 
4162                 for (i = 0; i < info->rx_buf_count; i++) {
4163                         info->rx_buf_list[i].status = 0xff;
4164 
4165                         // throttle to 4 shared memory writes at a time to prevent
4166                         // hogging local bus (keep latency time for DMA requests low).
4167                         if (!(i % 4))
4168                                 read_status_reg(info);
4169                 }
4170                 info->current_rx_buf = 0;
4171 
4172                 /* set current/1st descriptor address */
4173                 write_reg16(info, RXDMA + CDA,
4174                         info->rx_buf_list_ex[0].phys_entry);
4175 
4176                 /* set new last rx descriptor address */
4177                 write_reg16(info, RXDMA + EDA,
4178                         info->rx_buf_list_ex[info->rx_buf_count - 1].phys_entry);
4179 
4180                 /* set buffer length (shared by all rx dma data buffers) */
4181                 write_reg16(info, RXDMA + BFL, SCABUFSIZE);
4182 
4183                 write_reg(info, RXDMA + DIR, 0x60);     /* enable Rx DMA interrupts (EOM/BOF) */
4184                 write_reg(info, RXDMA + DSR, 0xf2);     /* clear Rx DMA IRQs, enable Rx DMA */
4185         } else {
4186                 /* async, enable IRQ on rxdata */
4187                 info->ie0_value |= RXRDYE;
4188                 write_reg(info, IE0, info->ie0_value);
4189         }
4190 
4191         write_reg(info, CMD, RXENABLE);
4192 
4193         info->rx_overflow = false;
4194         info->rx_enabled = true;
4195 }
4196 
4197 /* Enable the transmitter and send a transmit frame if
4198  * one is loaded in the DMA buffers.
4199  */
4200 static void tx_start(SLMP_INFO *info)
4201 {
4202         if (debug_level >= DEBUG_LEVEL_ISR)
4203                 printk("%s(%d):%s tx_start() tx_count=%d\n",
4204                          __FILE__,__LINE__, info->device_name,info->tx_count );
4205 
4206         if (!info->tx_enabled ) {
4207                 write_reg(info, CMD, TXRESET);
4208                 write_reg(info, CMD, TXENABLE);
4209                 info->tx_enabled = true;
4210         }
4211 
4212         if ( info->tx_count ) {
4213 
4214                 /* If auto RTS enabled and RTS is inactive, then assert */
4215                 /* RTS and set a flag indicating that the driver should */
4216                 /* negate RTS when the transmission completes. */
4217 
4218                 info->drop_rts_on_tx_done = false;
4219 
4220                 if (info->params.mode != MGSL_MODE_ASYNC) {
4221 
4222                         if ( info->params.flags & HDLC_FLAG_AUTO_RTS ) {
4223                                 get_signals( info );
4224                                 if ( !(info->serial_signals & SerialSignal_RTS) ) {
4225                                         info->serial_signals |= SerialSignal_RTS;
4226                                         set_signals( info );
4227                                         info->drop_rts_on_tx_done = true;
4228                                 }
4229                         }
4230 
4231                         write_reg16(info, TRC0,
4232                                 (unsigned short)(((tx_negate_fifo_level-1)<<8) + tx_active_fifo_level));
4233 
4234                         write_reg(info, TXDMA + DSR, 0);                /* disable DMA channel */
4235                         write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
4236         
4237                         /* set TX CDA (current descriptor address) */
4238                         write_reg16(info, TXDMA + CDA,
4239                                 info->tx_buf_list_ex[0].phys_entry);
4240         
4241                         /* set TX EDA (last descriptor address) */
4242                         write_reg16(info, TXDMA + EDA,
4243                                 info->tx_buf_list_ex[info->last_tx_buf].phys_entry);
4244         
4245                         /* enable underrun IRQ */
4246                         info->ie1_value &= ~IDLE;
4247                         info->ie1_value |= UDRN;
4248                         write_reg(info, IE1, info->ie1_value);
4249                         write_reg(info, SR1, (unsigned char)(IDLE + UDRN));
4250         
4251                         write_reg(info, TXDMA + DIR, 0x40);             /* enable Tx DMA interrupts (EOM) */
4252                         write_reg(info, TXDMA + DSR, 0xf2);             /* clear Tx DMA IRQs, enable Tx DMA */
4253         
4254                         mod_timer(&info->tx_timer, jiffies +
4255                                         msecs_to_jiffies(5000));
4256                 }
4257                 else {
4258                         tx_load_fifo(info);
4259                         /* async, enable IRQ on txdata */
4260                         info->ie0_value |= TXRDYE;
4261                         write_reg(info, IE0, info->ie0_value);
4262                 }
4263 
4264                 info->tx_active = true;
4265         }
4266 }
4267 
4268 /* stop the transmitter and DMA
4269  */
4270 static void tx_stop( SLMP_INFO *info )
4271 {
4272         if (debug_level >= DEBUG_LEVEL_ISR)
4273                 printk("%s(%d):%s tx_stop()\n",
4274                          __FILE__,__LINE__, info->device_name );
4275 
4276         del_timer(&info->tx_timer);
4277 
4278         write_reg(info, TXDMA + DSR, 0);                /* disable DMA channel */
4279         write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
4280 
4281         write_reg(info, CMD, TXRESET);
4282 
4283         info->ie1_value &= ~(UDRN + IDLE);
4284         write_reg(info, IE1, info->ie1_value);  /* disable tx status interrupts */
4285         write_reg(info, SR1, (unsigned char)(IDLE + UDRN));     /* clear pending */
4286 
4287         info->ie0_value &= ~TXRDYE;
4288         write_reg(info, IE0, info->ie0_value);  /* disable tx data interrupts */
4289 
4290         info->tx_enabled = false;
4291         info->tx_active = false;
4292 }
4293 
4294 /* Fill the transmit FIFO until the FIFO is full or
4295  * there is no more data to load.
4296  */
4297 static void tx_load_fifo(SLMP_INFO *info)
4298 {
4299         u8 TwoBytes[2];
4300 
4301         /* do nothing is now tx data available and no XON/XOFF pending */
4302 
4303         if ( !info->tx_count && !info->x_char )
4304                 return;
4305 
4306         /* load the Transmit FIFO until FIFOs full or all data sent */
4307 
4308         while( info->tx_count && (read_reg(info,SR0) & BIT1) ) {
4309 
4310                 /* there is more space in the transmit FIFO and */
4311                 /* there is more data in transmit buffer */
4312 
4313                 if ( (info->tx_count > 1) && !info->x_char ) {
4314                         /* write 16-bits */
4315                         TwoBytes[0] = info->tx_buf[info->tx_get++];
4316                         if (info->tx_get >= info->max_frame_size)
4317                                 info->tx_get -= info->max_frame_size;
4318                         TwoBytes[1] = info->tx_buf[info->tx_get++];
4319                         if (info->tx_get >= info->max_frame_size)
4320                                 info->tx_get -= info->max_frame_size;
4321 
4322                         write_reg16(info, TRB, *((u16 *)TwoBytes));
4323 
4324                         info->tx_count -= 2;
4325                         info->icount.tx += 2;
4326                 } else {
4327                         /* only 1 byte left to transmit or 1 FIFO slot left */
4328 
4329                         if (info->x_char) {
4330                                 /* transmit pending high priority char */
4331                                 write_reg(info, TRB, info->x_char);
4332                                 info->x_char = 0;
4333                         } else {
4334                                 write_reg(info, TRB, info->tx_buf[info->tx_get++]);
4335                                 if (info->tx_get >= info->max_frame_size)
4336                                         info->tx_get -= info->max_frame_size;
4337                                 info->tx_count--;
4338                         }
4339                         info->icount.tx++;
4340                 }
4341         }
4342 }
4343 
4344 /* Reset a port to a known state
4345  */
4346 static void reset_port(SLMP_INFO *info)
4347 {
4348         if (info->sca_base) {
4349 
4350                 tx_stop(info);
4351                 rx_stop(info);
4352 
4353                 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
4354                 set_signals(info);
4355 
4356                 /* disable all port interrupts */
4357                 info->ie0_value = 0;
4358                 info->ie1_value = 0;
4359                 info->ie2_value = 0;
4360                 write_reg(info, IE0, info->ie0_value);
4361                 write_reg(info, IE1, info->ie1_value);
4362                 write_reg(info, IE2, info->ie2_value);
4363 
4364                 write_reg(info, CMD, CHRESET);
4365         }
4366 }
4367 
4368 /* Reset all the ports to a known state.
4369  */
4370 static void reset_adapter(SLMP_INFO *info)
4371 {
4372         int i;
4373 
4374         for ( i=0; i < SCA_MAX_PORTS; ++i) {
4375                 if (info->port_array[i])
4376                         reset_port(info->port_array[i]);
4377         }
4378 }
4379 
4380 /* Program port for asynchronous communications.
4381  */
4382 static void async_mode(SLMP_INFO *info)
4383 {
4384 
4385         unsigned char RegValue;
4386 
4387         tx_stop(info);
4388         rx_stop(info);
4389 
4390         /* MD0, Mode Register 0
4391          *
4392          * 07..05  PRCTL<2..0>, Protocol Mode, 000=async
4393          * 04      AUTO, Auto-enable (RTS/CTS/DCD)
4394          * 03      Reserved, must be 0
4395          * 02      CRCCC, CRC Calculation, 0=disabled
4396          * 01..00  STOP<1..0> Stop bits (00=1,10=2)
4397          *
4398          * 0000 0000
4399          */
4400         RegValue = 0x00;
4401         if (info->params.stop_bits != 1)
4402                 RegValue |= BIT1;
4403         write_reg(info, MD0, RegValue);
4404 
4405         /* MD1, Mode Register 1
4406          *
4407          * 07..06  BRATE<1..0>, bit rate, 00=1/1 01=1/16 10=1/32 11=1/64
4408          * 05..04  TXCHR<1..0>, tx char size, 00=8 bits,01=7,10=6,11=5
4409          * 03..02  RXCHR<1..0>, rx char size
4410          * 01..00  PMPM<1..0>, Parity mode, 00=none 10=even 11=odd
4411          *
4412          * 0100 0000
4413          */
4414         RegValue = 0x40;
4415         switch (info->params.data_bits) {
4416         case 7: RegValue |= BIT4 + BIT2; break;
4417         case 6: RegValue |= BIT5 + BIT3; break;
4418         case 5: RegValue |= BIT5 + BIT4 + BIT3 + BIT2; break;
4419         }
4420         if (info->params.parity != ASYNC_PARITY_NONE) {
4421                 RegValue |= BIT1;
4422                 if (info->params.parity == ASYNC_PARITY_ODD)
4423                         RegValue |= BIT0;
4424         }
4425         write_reg(info, MD1, RegValue);
4426 
4427         /* MD2, Mode Register 2
4428          *
4429          * 07..02  Reserved, must be 0
4430          * 01..00  CNCT<1..0> Channel connection, 00=normal 11=local loopback
4431          *
4432          * 0000 0000
4433          */
4434         RegValue = 0x00;
4435         if (info->params.loopback)
4436                 RegValue |= (BIT1 + BIT0);
4437         write_reg(info, MD2, RegValue);
4438 
4439         /* RXS, Receive clock source
4440          *
4441          * 07      Reserved, must be 0
4442          * 06..04  RXCS<2..0>, clock source, 000=RxC Pin, 100=BRG, 110=DPLL
4443          * 03..00  RXBR<3..0>, rate divisor, 0000=1
4444          */
4445         RegValue=BIT6;
4446         write_reg(info, RXS, RegValue);
4447 
4448         /* TXS, Transmit clock source
4449          *
4450          * 07      Reserved, must be 0
4451          * 06..04  RXCS<2..0>, clock source, 000=TxC Pin, 100=BRG, 110=Receive Clock
4452          * 03..00  RXBR<3..0>, rate divisor, 0000=1
4453          */
4454         RegValue=BIT6;
4455         write_reg(info, TXS, RegValue);
4456 
4457         /* Control Register
4458          *
4459          * 6,4,2,0  CLKSEL<3..0>, 0 = TcCLK in, 1 = Auxclk out
4460          */
4461         info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4462         write_control_reg(info);
4463 
4464         tx_set_idle(info);
4465 
4466         /* RRC Receive Ready Control 0
4467          *
4468          * 07..05  Reserved, must be 0
4469          * 04..00  RRC<4..0> Rx FIFO trigger active 0x00 = 1 byte
4470          */
4471         write_reg(info, RRC, 0x00);
4472 
4473         /* TRC0 Transmit Ready Control 0
4474          *
4475          * 07..05  Reserved, must be 0
4476          * 04..00  TRC<4..0> Tx FIFO trigger active 0x10 = 16 bytes
4477          */
4478         write_reg(info, TRC0, 0x10);
4479 
4480         /* TRC1 Transmit Ready Control 1
4481          *
4482          * 07..05  Reserved, must be 0
4483          * 04..00  TRC<4..0> Tx FIFO trigger inactive 0x1e = 31 bytes (full-1)
4484          */
4485         write_reg(info, TRC1, 0x1e);
4486 
4487         /* CTL, MSCI control register
4488          *
4489          * 07..06  Reserved, set to 0
4490          * 05      UDRNC, underrun control, 0=abort 1=CRC+flag (HDLC/BSC)
4491          * 04      IDLC, idle control, 0=mark 1=idle register
4492          * 03      BRK, break, 0=off 1 =on (async)
4493          * 02      SYNCLD, sync char load enable (BSC) 1=enabled
4494          * 01      GOP, go active on poll (LOOP mode) 1=enabled
4495          * 00      RTS, RTS output control, 0=active 1=inactive
4496          *
4497          * 0001 0001
4498          */
4499         RegValue = 0x10;
4500         if (!(info->serial_signals & SerialSignal_RTS))
4501                 RegValue |= 0x01;
4502         write_reg(info, CTL, RegValue);
4503 
4504         /* enable status interrupts */
4505         info->ie0_value |= TXINTE + RXINTE;
4506         write_reg(info, IE0, info->ie0_value);
4507 
4508         /* enable break detect interrupt */
4509         info->ie1_value = BRKD;
4510         write_reg(info, IE1, info->ie1_value);
4511 
4512         /* enable rx overrun interrupt */
4513         info->ie2_value = OVRN;
4514         write_reg(info, IE2, info->ie2_value);
4515 
4516         set_rate( info, info->params.data_rate * 16 );
4517 }
4518 
4519 /* Program the SCA for HDLC communications.
4520  */
4521 static void hdlc_mode(SLMP_INFO *info)
4522 {
4523         unsigned char RegValue;
4524         u32 DpllDivisor;
4525 
4526         // Can't use DPLL because SCA outputs recovered clock on RxC when
4527         // DPLL mode selected. This causes output contention with RxC receiver.
4528         // Use of DPLL would require external hardware to disable RxC receiver
4529         // when DPLL mode selected.
4530         info->params.flags &= ~(HDLC_FLAG_TXC_DPLL + HDLC_FLAG_RXC_DPLL);
4531 
4532         /* disable DMA interrupts */
4533         write_reg(info, TXDMA + DIR, 0);
4534         write_reg(info, RXDMA + DIR, 0);
4535 
4536         /* MD0, Mode Register 0
4537          *
4538          * 07..05  PRCTL<2..0>, Protocol Mode, 100=HDLC
4539          * 04      AUTO, Auto-enable (RTS/CTS/DCD)
4540          * 03      Reserved, must be 0
4541          * 02      CRCCC, CRC Calculation, 1=enabled
4542          * 01      CRC1, CRC selection, 0=CRC-16,1=CRC-CCITT-16
4543          * 00      CRC0, CRC initial value, 1 = all 1s
4544          *
4545          * 1000 0001
4546          */
4547         RegValue = 0x81;
4548         if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4549                 RegValue |= BIT4;
4550         if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4551                 RegValue |= BIT4;
4552         if (info->params.crc_type == HDLC_CRC_16_CCITT)
4553                 RegValue |= BIT2 + BIT1;
4554         write_reg(info, MD0, RegValue);
4555 
4556         /* MD1, Mode Register 1
4557          *
4558          * 07..06  ADDRS<1..0>, Address detect, 00=no addr check
4559          * 05..04  TXCHR<1..0>, tx char size, 00=8 bits
4560          * 03..02  RXCHR<1..0>, rx char size, 00=8 bits
4561          * 01..00  PMPM<1..0>, Parity mode, 00=no parity
4562          *
4563          * 0000 0000
4564          */
4565         RegValue = 0x00;
4566         write_reg(info, MD1, RegValue);
4567 
4568         /* MD2, Mode Register 2
4569          *
4570          * 07      NRZFM, 0=NRZ, 1=FM
4571          * 06..05  CODE<1..0> Encoding, 00=NRZ
4572          * 04..03  DRATE<1..0> DPLL Divisor, 00=8
4573          * 02      Reserved, must be 0
4574          * 01..00  CNCT<1..0> Channel connection, 0=normal
4575          *
4576          * 0000 0000
4577          */
4578         RegValue = 0x00;
4579         switch(info->params.encoding) {
4580         case HDLC_ENCODING_NRZI:          RegValue |= BIT5; break;
4581         case HDLC_ENCODING_BIPHASE_MARK:  RegValue |= BIT7 + BIT5; break; /* aka FM1 */
4582         case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT7 + BIT6; break; /* aka FM0 */
4583         case HDLC_ENCODING_BIPHASE_LEVEL: RegValue |= BIT7; break;      /* aka Manchester */
4584 #if 0
4585         case HDLC_ENCODING_NRZB:                                        /* not supported */
4586         case HDLC_ENCODING_NRZI_MARK:                                   /* not supported */
4587         case HDLC_ENCODING_DIFF_BIPHASE_LEVEL:                          /* not supported */
4588 #endif
4589         }
4590         if ( info->params.flags & HDLC_FLAG_DPLL_DIV16 ) {
4591                 DpllDivisor = 16;
4592                 RegValue |= BIT3;
4593         } else if ( info->params.flags & HDLC_FLAG_DPLL_DIV8 ) {
4594                 DpllDivisor = 8;
4595         } else {
4596                 DpllDivisor = 32;
4597                 RegValue |= BIT4;
4598         }
4599         write_reg(info, MD2, RegValue);
4600 
4601 
4602         /* RXS, Receive clock source
4603          *
4604          * 07      Reserved, must be 0
4605          * 06..04  RXCS<2..0>, clock source, 000=RxC Pin, 100=BRG, 110=DPLL
4606          * 03..00  RXBR<3..0>, rate divisor, 0000=1
4607          */
4608         RegValue=0;
4609         if (info->params.flags & HDLC_FLAG_RXC_BRG)
4610                 RegValue |= BIT6;
4611         if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4612                 RegValue |= BIT6 + BIT5;
4613         write_reg(info, RXS, RegValue);
4614 
4615         /* TXS, Transmit clock source
4616          *
4617          * 07      Reserved, must be 0
4618          * 06..04  RXCS<2..0>, clock source, 000=TxC Pin, 100=BRG, 110=Receive Clock
4619          * 03..00  RXBR<3..0>, rate divisor, 0000=1
4620          */
4621         RegValue=0;
4622         if (info->params.flags & HDLC_FLAG_TXC_BRG)
4623                 RegValue |= BIT6;
4624         if (info->params.flags & HDLC_FLAG_TXC_DPLL)
4625                 RegValue |= BIT6 + BIT5;
4626         write_reg(info, TXS, RegValue);
4627 
4628         if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4629                 set_rate(info, info->params.clock_speed * DpllDivisor);
4630         else
4631                 set_rate(info, info->params.clock_speed);
4632 
4633         /* GPDATA (General Purpose I/O Data Register)
4634          *
4635          * 6,4,2,0  CLKSEL<3..0>, 0 = TcCLK in, 1 = Auxclk out
4636          */
4637         if (info->params.flags & HDLC_FLAG_TXC_BRG)
4638                 info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4639         else
4640                 info->port_array[0]->ctrlreg_value &= ~(BIT0 << (info->port_num * 2));
4641         write_control_reg(info);
4642 
4643         /* RRC Receive Ready Control 0
4644          *
4645          * 07..05  Reserved, must be 0
4646          * 04..00  RRC<4..0> Rx FIFO trigger active
4647          */
4648         write_reg(info, RRC, rx_active_fifo_level);
4649 
4650         /* TRC0 Transmit Ready Control 0
4651          *
4652          * 07..05  Reserved, must be 0
4653          * 04..00  TRC<4..0> Tx FIFO trigger active
4654          */
4655         write_reg(info, TRC0, tx_active_fifo_level);
4656 
4657         /* TRC1 Transmit Ready Control 1
4658          *
4659          * 07..05  Reserved, must be 0
4660          * 04..00  TRC<4..0> Tx FIFO trigger inactive 0x1f = 32 bytes (full)
4661          */
4662         write_reg(info, TRC1, (unsigned char)(tx_negate_fifo_level - 1));
4663 
4664         /* DMR, DMA Mode Register
4665          *
4666          * 07..05  Reserved, must be 0
4667          * 04      TMOD, Transfer Mode: 1=chained-block
4668          * 03      Reserved, must be 0
4669          * 02      NF, Number of Frames: 1=multi-frame
4670          * 01      CNTE, Frame End IRQ Counter enable: 0=disabled
4671          * 00      Reserved, must be 0
4672          *
4673          * 0001 0100
4674          */
4675         write_reg(info, TXDMA + DMR, 0x14);
4676         write_reg(info, RXDMA + DMR, 0x14);
4677 
4678         /* Set chain pointer base (upper 8 bits of 24 bit addr) */
4679         write_reg(info, RXDMA + CPB,
4680                 (unsigned char)(info->buffer_list_phys >> 16));
4681 
4682         /* Set chain pointer base (upper 8 bits of 24 bit addr) */
4683         write_reg(info, TXDMA + CPB,
4684                 (unsigned char)(info->buffer_list_phys >> 16));
4685 
4686         /* enable status interrupts. other code enables/disables
4687          * the individual sources for these two interrupt classes.
4688          */
4689         info->ie0_value |= TXINTE + RXINTE;
4690         write_reg(info, IE0, info->ie0_value);
4691 
4692         /* CTL, MSCI control register
4693          *
4694          * 07..06  Reserved, set to 0
4695          * 05      UDRNC, underrun control, 0=abort 1=CRC+flag (HDLC/BSC)
4696          * 04      IDLC, idle control, 0=mark 1=idle register
4697          * 03      BRK, break, 0=off 1 =on (async)
4698          * 02      SYNCLD, sync char load enable (BSC) 1=enabled
4699          * 01      GOP, go active on poll (LOOP mode) 1=enabled
4700          * 00      RTS, RTS output control, 0=active 1=inactive
4701          *
4702          * 0001 0001
4703          */
4704         RegValue = 0x10;
4705         if (!(info->serial_signals & SerialSignal_RTS))
4706                 RegValue |= 0x01;
4707         write_reg(info, CTL, RegValue);
4708 
4709         /* preamble not supported ! */
4710 
4711         tx_set_idle(info);
4712         tx_stop(info);
4713         rx_stop(info);
4714 
4715         set_rate(info, info->params.clock_speed);
4716 
4717         if (info->params.loopback)
4718                 enable_loopback(info,1);
4719 }
4720 
4721 /* Set the transmit HDLC idle mode
4722  */
4723 static void tx_set_idle(SLMP_INFO *info)
4724 {
4725         unsigned char RegValue = 0xff;
4726 
4727         /* Map API idle mode to SCA register bits */
4728         switch(info->idle_mode) {
4729         case HDLC_TXIDLE_FLAGS:                 RegValue = 0x7e; break;
4730         case HDLC_TXIDLE_ALT_ZEROS_ONES:        RegValue = 0xaa; break;
4731         case HDLC_TXIDLE_ZEROS:                 RegValue = 0x00; break;
4732         case HDLC_TXIDLE_ONES:                  RegValue = 0xff; break;
4733         case HDLC_TXIDLE_ALT_MARK_SPACE:        RegValue = 0xaa; break;
4734         case HDLC_TXIDLE_SPACE:                 RegValue = 0x00; break;
4735         case HDLC_TXIDLE_MARK:                  RegValue = 0xff; break;
4736         }
4737 
4738         write_reg(info, IDL, RegValue);
4739 }
4740 
4741 /* Query the adapter for the state of the V24 status (input) signals.
4742  */
4743 static void get_signals(SLMP_INFO *info)
4744 {
4745         u16 status = read_reg(info, SR3);
4746         u16 gpstatus = read_status_reg(info);
4747         u16 testbit;
4748 
4749         /* clear all serial signals except RTS and DTR */
4750         info->serial_signals &= SerialSignal_RTS | SerialSignal_DTR;
4751 
4752         /* set serial signal bits to reflect MISR */
4753 
4754         if (!(status & BIT3))
4755                 info->serial_signals |= SerialSignal_CTS;
4756 
4757         if ( !(status & BIT2))
4758                 info->serial_signals |= SerialSignal_DCD;
4759 
4760         testbit = BIT1 << (info->port_num * 2); // Port 0..3 RI is GPDATA<1,3,5,7>
4761         if (!(gpstatus & testbit))
4762                 info->serial_signals |= SerialSignal_RI;
4763 
4764         testbit = BIT0 << (info->port_num * 2); // Port 0..3 DSR is GPDATA<0,2,4,6>
4765         if (!(gpstatus & testbit))
4766                 info->serial_signals |= SerialSignal_DSR;
4767 }
4768 
4769 /* Set the state of RTS and DTR based on contents of
4770  * serial_signals member of device context.
4771  */
4772 static void set_signals(SLMP_INFO *info)
4773 {
4774         unsigned char RegValue;
4775         u16 EnableBit;
4776 
4777         RegValue = read_reg(info, CTL);
4778         if (info->serial_signals & SerialSignal_RTS)
4779                 RegValue &= ~BIT0;
4780         else
4781                 RegValue |= BIT0;
4782         write_reg(info, CTL, RegValue);
4783 
4784         // Port 0..3 DTR is ctrl reg <1,3,5,7>
4785         EnableBit = BIT1 << (info->port_num*2);
4786         if (info->serial_signals & SerialSignal_DTR)
4787                 info->port_array[0]->ctrlreg_value &= ~EnableBit;
4788         else
4789                 info->port_array[0]->ctrlreg_value |= EnableBit;
4790         write_control_reg(info);
4791 }
4792 
4793 /*******************/
4794 /* DMA Buffer Code */
4795 /*******************/
4796 
4797 /* Set the count for all receive buffers to SCABUFSIZE
4798  * and set the current buffer to the first buffer. This effectively
4799  * makes all buffers free and discards any data in buffers.
4800  */
4801 static void rx_reset_buffers(SLMP_INFO *info)
4802 {
4803         rx_free_frame_buffers(info, 0, info->rx_buf_count - 1);
4804 }
4805 
4806 /* Free the buffers used by a received frame
4807  *
4808  * info   pointer to device instance data
4809  * first  index of 1st receive buffer of frame
4810  * last   index of last receive buffer of frame
4811  */
4812 static void rx_free_frame_buffers(SLMP_INFO *info, unsigned int first, unsigned int last)
4813 {
4814         bool done = false;
4815 
4816         while(!done) {
4817                 /* reset current buffer for reuse */
4818                 info->rx_buf_list[first].status = 0xff;
4819 
4820                 if (first == last) {
4821                         done = true;
4822                         /* set new last rx descriptor address */
4823                         write_reg16(info, RXDMA + EDA, info->rx_buf_list_ex[first].phys_entry);
4824                 }
4825 
4826                 first++;
4827                 if (first == info->rx_buf_count)
4828                         first = 0;
4829         }
4830 
4831         /* set current buffer to next buffer after last buffer of frame */
4832         info->current_rx_buf = first;
4833 }
4834 
4835 /* Return a received frame from the receive DMA buffers.
4836  * Only frames received without errors are returned.
4837  *
4838  * Return Value:        true if frame returned, otherwise false
4839  */
4840 static bool rx_get_frame(SLMP_INFO *info)
4841 {
4842         unsigned int StartIndex, EndIndex;      /* index of 1st and last buffers of Rx frame */
4843         unsigned short status;
4844         unsigned int framesize = 0;
4845         bool ReturnCode = false;
4846         unsigned long flags;
4847         struct tty_struct *tty = info->port.tty;
4848         unsigned char addr_field = 0xff;
4849         SCADESC *desc;
4850         SCADESC_EX *desc_ex;
4851 
4852 CheckAgain:
4853         /* assume no frame returned, set zero length */
4854         framesize = 0;
4855         addr_field = 0xff;
4856 
4857         /*
4858          * current_rx_buf points to the 1st buffer of the next available
4859          * receive frame. To find the last buffer of the frame look for
4860          * a non-zero status field in the buffer entries. (The status
4861          * field is set by the 16C32 after completing a receive frame.
4862          */
4863         StartIndex = EndIndex = info->current_rx_buf;
4864 
4865         for ( ;; ) {
4866                 desc = &info->rx_buf_list[EndIndex];
4867                 desc_ex = &info->rx_buf_list_ex[EndIndex];
4868 
4869                 if (desc->status == 0xff)
4870                         goto Cleanup;   /* current desc still in use, no frames available */
4871 
4872                 if (framesize == 0 && info->params.addr_filter != 0xff)
4873                         addr_field = desc_ex->virt_addr[0];
4874 
4875                 framesize += desc->length;
4876 
4877                 /* Status != 0 means last buffer of frame */
4878                 if (desc->status)
4879                         break;
4880 
4881                 EndIndex++;
4882                 if (EndIndex == info->rx_buf_count)
4883                         EndIndex = 0;
4884 
4885                 if (EndIndex == info->current_rx_buf) {
4886                         /* all buffers have been 'used' but none mark      */
4887                         /* the end of a frame. Reset buffers and receiver. */
4888                         if ( info->rx_enabled ){
4889                                 spin_lock_irqsave(&info->lock,flags);
4890                                 rx_start(info);
4891                                 spin_unlock_irqrestore(&info->lock,flags);
4892                         }
4893                         goto Cleanup;
4894                 }
4895 
4896         }
4897 
4898         /* check status of receive frame */
4899 
4900         /* frame status is byte stored after frame data
4901          *
4902          * 7 EOM (end of msg), 1 = last buffer of frame
4903          * 6 Short Frame, 1 = short frame
4904          * 5 Abort, 1 = frame aborted
4905          * 4 Residue, 1 = last byte is partial
4906          * 3 Overrun, 1 = overrun occurred during frame reception
4907          * 2 CRC,     1 = CRC error detected
4908          *
4909          */
4910         status = desc->status;
4911 
4912         /* ignore CRC bit if not using CRC (bit is undefined) */
4913         /* Note:CRC is not save to data buffer */
4914         if (info->params.crc_type == HDLC_CRC_NONE)
4915                 status &= ~BIT2;
4916 
4917         if (framesize == 0 ||
4918                  (addr_field != 0xff && addr_field != info->params.addr_filter)) {
4919                 /* discard 0 byte frames, this seems to occur sometime
4920                  * when remote is idling flags.
4921                  */
4922                 rx_free_frame_buffers(info, StartIndex, EndIndex);
4923                 goto CheckAgain;
4924         }
4925 
4926         if (framesize < 2)
4927                 status |= BIT6;
4928 
4929         if (status & (BIT6+BIT5+BIT3+BIT2)) {
4930                 /* received frame has errors,
4931                  * update counts and mark frame size as 0
4932                  */
4933                 if (status & BIT6)
4934                         info->icount.rxshort++;
4935                 else if (status & BIT5)
4936                         info->icount.rxabort++;
4937                 else if (status & BIT3)
4938                         info->icount.rxover++;
4939                 else
4940                         info->icount.rxcrc++;
4941 
4942                 framesize = 0;
4943 #if SYNCLINK_GENERIC_HDLC
4944                 {
4945                         info->netdev->stats.rx_errors++;
4946                         info->netdev->stats.rx_frame_errors++;
4947                 }
4948 #endif
4949         }
4950 
4951         if ( debug_level >= DEBUG_LEVEL_BH )
4952                 printk("%s(%d):%s rx_get_frame() status=%04X size=%d\n",
4953                         __FILE__,__LINE__,info->device_name,status,framesize);
4954 
4955         if ( debug_level >= DEBUG_LEVEL_DATA )
4956                 trace_block(info,info->rx_buf_list_ex[StartIndex].virt_addr,
4957                         min_t(unsigned int, framesize, SCABUFSIZE), 0);
4958 
4959         if (framesize) {
4960                 if (framesize > info->max_frame_size)
4961                         info->icount.rxlong++;
4962                 else {
4963                         /* copy dma buffer(s) to contiguous intermediate buffer */
4964                         int copy_count = framesize;
4965                         int index = StartIndex;
4966                         unsigned char *ptmp = info->tmp_rx_buf;
4967                         info->tmp_rx_buf_count = framesize;
4968 
4969                         info->icount.rxok++;
4970 
4971                         while(copy_count) {
4972                                 int partial_count = min(copy_count,SCABUFSIZE);
4973                                 memcpy( ptmp,
4974                                         info->rx_buf_list_ex[index].virt_addr,
4975                                         partial_count );
4976                                 ptmp += partial_count;
4977                                 copy_count -= partial_count;
4978 
4979                                 if ( ++index == info->rx_buf_count )
4980                                         index = 0;
4981                         }
4982 
4983 #if SYNCLINK_GENERIC_HDLC
4984                         if (info->netcount)
4985                                 hdlcdev_rx(info,info->tmp_rx_buf,framesize);
4986                         else
4987 #endif
4988                                 ldisc_receive_buf(tty,info->tmp_rx_buf,
4989                                                   info->flag_buf, framesize);
4990                 }
4991         }
4992         /* Free the buffers used by this frame. */
4993         rx_free_frame_buffers( info, StartIndex, EndIndex );
4994 
4995         ReturnCode = true;
4996 
4997 Cleanup:
4998         if ( info->rx_enabled && info->rx_overflow ) {
4999                 /* Receiver is enabled, but needs to restarted due to
5000                  * rx buffer overflow. If buffers are empty, restart receiver.
5001                  */
5002                 if (info->rx_buf_list[EndIndex].status == 0xff) {
5003                         spin_lock_irqsave(&info->lock,flags);
5004                         rx_start(info);
5005                         spin_unlock_irqrestore(&info->lock,flags);
5006                 }
5007         }
5008 
5009         return ReturnCode;
5010 }
5011 
5012 /* load the transmit DMA buffer with data
5013  */
5014 static void tx_load_dma_buffer(SLMP_INFO *info, const char *buf, unsigned int count)
5015 {
5016         unsigned short copy_count;
5017         unsigned int i = 0;
5018         SCADESC *desc;
5019         SCADESC_EX *desc_ex;
5020 
5021         if ( debug_level >= DEBUG_LEVEL_DATA )
5022                 trace_block(info, buf, min_t(unsigned int, count, SCABUFSIZE), 1);
5023 
5024         /* Copy source buffer to one or more DMA buffers, starting with
5025          * the first transmit dma buffer.
5026          */
5027         for(i=0;;)
5028         {
5029                 copy_count = min_t(unsigned int, count, SCABUFSIZE);
5030 
5031                 desc = &info->tx_buf_list[i];
5032                 desc_ex = &info->tx_buf_list_ex[i];
5033 
5034                 load_pci_memory(info, desc_ex->virt_addr,buf,copy_count);
5035 
5036                 desc->length = copy_count;
5037                 desc->status = 0;
5038 
5039                 buf += copy_count;
5040                 count -= copy_count;
5041 
5042                 if (!count)
5043                         break;
5044 
5045                 i++;
5046                 if (i >= info->tx_buf_count)
5047                         i = 0;
5048         }
5049 
5050         info->tx_buf_list[i].status = 0x81;     /* set EOM and EOT status */
5051         info->last_tx_buf = ++i;
5052 }
5053 
5054 static bool register_test(SLMP_INFO *info)
5055 {
5056         static unsigned char testval[] = {0x00, 0xff, 0xaa, 0x55, 0x69, 0x96};
5057         static unsigned int count = ARRAY_SIZE(testval);
5058         unsigned int i;
5059         bool rc = true;
5060         unsigned long flags;
5061 
5062         spin_lock_irqsave(&info->lock,flags);
5063         reset_port(info);
5064 
5065         /* assume failure */
5066         info->init_error = DiagStatus_AddressFailure;
5067 
5068         /* Write bit patterns to various registers but do it out of */
5069         /* sync, then read back and verify values. */
5070 
5071         for (i = 0 ; i < count ; i++) {
5072                 write_reg(info, TMC, testval[i]);
5073                 write_reg(info, IDL, testval[(i+1)%count]);
5074                 write_reg(info, SA0, testval[(i+2)%count]);
5075                 write_reg(info, SA1, testval[(i+3)%count]);
5076 
5077                 if ( (read_reg(info, TMC) != testval[i]) ||
5078                           (read_reg(info, IDL) != testval[(i+1)%count]) ||
5079                           (read_reg(info, SA0) != testval[(i+2)%count]) ||
5080                           (read_reg(info, SA1) != testval[(i+3)%count]) )
5081                 {
5082                         rc = false;
5083                         break;
5084                 }
5085         }
5086 
5087         reset_port(info);
5088         spin_unlock_irqrestore(&info->lock,flags);
5089 
5090         return rc;
5091 }
5092 
5093 static bool irq_test(SLMP_INFO *info)
5094 {
5095         unsigned long timeout;
5096         unsigned long flags;
5097 
5098         unsigned char timer = (info->port_num & 1) ? TIMER2 : TIMER0;
5099 
5100         spin_lock_irqsave(&info->lock,flags);
5101         reset_port(info);
5102 
5103         /* assume failure */
5104         info->init_error = DiagStatus_IrqFailure;
5105         info->irq_occurred = false;
5106 
5107         /* setup timer0 on SCA0 to interrupt */
5108 
5109         /* IER2<7..4> = timer<3..0> interrupt enables (1=enabled) */
5110         write_reg(info, IER2, (unsigned char)((info->port_num & 1) ? BIT6 : BIT4));
5111 
5112         write_reg(info, (unsigned char)(timer + TEPR), 0);      /* timer expand prescale */
5113         write_reg16(info, (unsigned char)(timer + TCONR), 1);   /* timer constant */
5114 
5115 
5116         /* TMCS, Timer Control/Status Register
5117          *
5118          * 07      CMF, Compare match flag (read only) 1=match
5119          * 06      ECMI, CMF Interrupt Enable: 1=enabled
5120          * 05      Reserved, must be 0
5121          * 04      TME, Timer Enable
5122          * 03..00  Reserved, must be 0
5123          *
5124          * 0101 0000
5125          */
5126         write_reg(info, (unsigned char)(timer + TMCS), 0x50);
5127 
5128         spin_unlock_irqrestore(&info->lock,flags);
5129 
5130         timeout=100;
5131         while( timeout-- && !info->irq_occurred ) {
5132                 msleep_interruptible(10);
5133         }
5134 
5135         spin_lock_irqsave(&info->lock,flags);
5136         reset_port(info);
5137         spin_unlock_irqrestore(&info->lock,flags);
5138 
5139         return info->irq_occurred;
5140 }
5141 
5142 /* initialize individual SCA device (2 ports)
5143  */
5144 static bool sca_init(SLMP_INFO *info)
5145 {
5146         /* set wait controller to single mem partition (low), no wait states */
5147         write_reg(info, PABR0, 0);      /* wait controller addr boundary 0 */
5148         write_reg(info, PABR1, 0);      /* wait controller addr boundary 1 */
5149         write_reg(info, WCRL, 0);       /* wait controller low range */
5150         write_reg(info, WCRM, 0);       /* wait controller mid range */
5151         write_reg(info, WCRH, 0);       /* wait controller high range */
5152 
5153         /* DPCR, DMA Priority Control
5154          *
5155          * 07..05  Not used, must be 0
5156          * 04      BRC, bus release condition: 0=all transfers complete
5157          * 03      CCC, channel change condition: 0=every cycle
5158          * 02..00  PR<2..0>, priority 100=round robin
5159          *
5160          * 00000100 = 0x04
5161          */
5162         write_reg(info, DPCR, dma_priority);
5163 
5164         /* DMA Master Enable, BIT7: 1=enable all channels */
5165         write_reg(info, DMER, 0x80);
5166 
5167         /* enable all interrupt classes */
5168         write_reg(info, IER0, 0xff);    /* TxRDY,RxRDY,TxINT,RxINT (ports 0-1) */
5169         write_reg(info, IER1, 0xff);    /* DMIB,DMIA (channels 0-3) */
5170         write_reg(info, IER2, 0xf0);    /* TIRQ (timers 0-3) */
5171 
5172         /* ITCR, interrupt control register
5173          * 07      IPC, interrupt priority, 0=MSCI->DMA
5174          * 06..05  IAK<1..0>, Acknowledge cycle, 00=non-ack cycle
5175          * 04      VOS, Vector Output, 0=unmodified vector
5176          * 03..00  Reserved, must be 0
5177          */
5178         write_reg(info, ITCR, 0);
5179 
5180         return true;
5181 }
5182 
5183 /* initialize adapter hardware
5184  */
5185 static bool init_adapter(SLMP_INFO *info)
5186 {
5187         int i;
5188 
5189         /* Set BIT30 of Local Control Reg 0x50 to reset SCA */
5190         volatile u32 *MiscCtrl = (u32 *)(info->lcr_base + 0x50);
5191         u32 readval;
5192 
5193         info->misc_ctrl_value |= BIT30;
5194         *MiscCtrl = info->misc_ctrl_value;
5195 
5196         /*
5197          * Force at least 170ns delay before clearing
5198          * reset bit. Each read from LCR takes at least
5199          * 30ns so 10 times for 300ns to be safe.
5200          */
5201         for(i=0;i<10;i++)
5202                 readval = *MiscCtrl;
5203 
5204         info->misc_ctrl_value &= ~BIT30;
5205         *MiscCtrl = info->misc_ctrl_value;
5206 
5207         /* init control reg (all DTRs off, all clksel=input) */
5208         info->ctrlreg_value = 0xaa;
5209         write_control_reg(info);
5210 
5211         {
5212                 volatile u32 *LCR1BRDR = (u32 *)(info->lcr_base + 0x2c);
5213                 lcr1_brdr_value &= ~(BIT5 + BIT4 + BIT3);
5214 
5215                 switch(read_ahead_count)
5216                 {
5217                 case 16:
5218                         lcr1_brdr_value |= BIT5 + BIT4 + BIT3;
5219                         break;
5220                 case 8:
5221                         lcr1_brdr_value |= BIT5 + BIT4;
5222                         break;
5223                 case 4:
5224                         lcr1_brdr_value |= BIT5 + BIT3;
5225                         break;
5226                 case 0:
5227                         lcr1_brdr_value |= BIT5;
5228                         break;
5229                 }
5230 
5231                 *LCR1BRDR = lcr1_brdr_value;
5232                 *MiscCtrl = misc_ctrl_value;
5233         }
5234 
5235         sca_init(info->port_array[0]);
5236         sca_init(info->port_array[2]);
5237 
5238         return true;
5239 }
5240 
5241 /* Loopback an HDLC frame to test the hardware
5242  * interrupt and DMA functions.
5243  */
5244 static bool loopback_test(SLMP_INFO *info)
5245 {
5246 #define TESTFRAMESIZE 20
5247 
5248         unsigned long timeout;
5249         u16 count = TESTFRAMESIZE;
5250         unsigned char buf[TESTFRAMESIZE];
5251         bool rc = false;
5252         unsigned long flags;
5253 
5254         struct tty_struct *oldtty = info->port.tty;
5255         u32 speed = info->params.clock_speed;
5256 
5257         info->params.clock_speed = 3686400;
5258         info->port.tty = NULL;
5259 
5260         /* assume failure */
5261         info->init_error = DiagStatus_DmaFailure;
5262 
5263         /* build and send transmit frame */
5264         for (count = 0; count < TESTFRAMESIZE;++count)
5265                 buf[count] = (unsigned char)count;
5266 
5267         memset(info->tmp_rx_buf,0,TESTFRAMESIZE);
5268 
5269         /* program hardware for HDLC and enabled receiver */
5270         spin_lock_irqsave(&info->lock,flags);
5271         hdlc_mode(info);
5272         enable_loopback(info,1);
5273         rx_start(info);
5274         info->tx_count = count;
5275         tx_load_dma_buffer(info,buf,count);
5276         tx_start(info);
5277         spin_unlock_irqrestore(&info->lock,flags);
5278 
5279         /* wait for receive complete */
5280         /* Set a timeout for waiting for interrupt. */
5281         for ( timeout = 100; timeout; --timeout ) {
5282                 msleep_interruptible(10);
5283 
5284                 if (rx_get_frame(info)) {
5285                         rc = true;
5286                         break;
5287                 }
5288         }
5289 
5290         /* verify received frame length and contents */
5291         if (rc &&
5292             ( info->tmp_rx_buf_count != count ||
5293               memcmp(buf, info->tmp_rx_buf,count))) {
5294                 rc = false;
5295         }
5296 
5297         spin_lock_irqsave(&info->lock,flags);
5298         reset_adapter(info);
5299         spin_unlock_irqrestore(&info->lock,flags);
5300 
5301         info->params.clock_speed = speed;
5302         info->port.tty = oldtty;
5303 
5304         return rc;
5305 }
5306 
5307 /* Perform diagnostics on hardware
5308  */
5309 static int adapter_test( SLMP_INFO *info )
5310 {
5311         unsigned long flags;
5312         if ( debug_level >= DEBUG_LEVEL_INFO )
5313                 printk( "%s(%d):Testing device %s\n",
5314                         __FILE__,__LINE__,info->device_name );
5315 
5316         spin_lock_irqsave(&info->lock,flags);
5317         init_adapter(info);
5318         spin_unlock_irqrestore(&info->lock,flags);
5319 
5320         info->port_array[0]->port_count = 0;
5321 
5322         if ( register_test(info->port_array[0]) &&
5323                 register_test(info->port_array[1])) {
5324 
5325                 info->port_array[0]->port_count = 2;
5326 
5327                 if ( register_test(info->port_array[2]) &&
5328                         register_test(info->port_array[3]) )
5329                         info->port_array[0]->port_count += 2;
5330         }
5331         else {
5332                 printk( "%s(%d):Register test failure for device %s Addr=%08lX\n",
5333                         __FILE__,__LINE__,info->device_name, (unsigned long)(info->phys_sca_base));
5334                 return -ENODEV;
5335         }
5336 
5337         if ( !irq_test(info->port_array[0]) ||
5338                 !irq_test(info->port_array[1]) ||
5339                  (info->port_count == 4 && !irq_test(info->port_array[2])) ||
5340                  (info->port_count == 4 && !irq_test(info->port_array[3]))) {
5341                 printk( "%s(%d):Interrupt test failure for device %s IRQ=%d\n",
5342                         __FILE__,__LINE__,info->device_name, (unsigned short)(info->irq_level) );
5343                 return -ENODEV;
5344         }
5345 
5346         if (!loopback_test(info->port_array[0]) ||
5347                 !loopback_test(info->port_array[1]) ||
5348                  (info->port_count == 4 && !loopback_test(info->port_array[2])) ||
5349                  (info->port_count == 4 && !loopback_test(info->port_array[3]))) {
5350                 printk( "%s(%d):DMA test failure for device %s\n",
5351                         __FILE__,__LINE__,info->device_name);
5352                 return -ENODEV;
5353         }
5354 
5355         if ( debug_level >= DEBUG_LEVEL_INFO )
5356                 printk( "%s(%d):device %s passed diagnostics\n",
5357                         __FILE__,__LINE__,info->device_name );
5358 
5359         info->port_array[0]->init_error = 0;
5360         info->port_array[1]->init_error = 0;
5361         if ( info->port_count > 2 ) {
5362                 info->port_array[2]->init_error = 0;
5363                 info->port_array[3]->init_error = 0;
5364         }
5365 
5366         return 0;
5367 }
5368 
5369 /* Test the shared memory on a PCI adapter.
5370  */
5371 static bool memory_test(SLMP_INFO *info)
5372 {
5373         static unsigned long testval[] = { 0x0, 0x55555555, 0xaaaaaaaa,
5374                 0x66666666, 0x99999999, 0xffffffff, 0x12345678 };
5375         unsigned long count = ARRAY_SIZE(testval);
5376         unsigned long i;
5377         unsigned long limit = SCA_MEM_SIZE/sizeof(unsigned long);
5378         unsigned long * addr = (unsigned long *)info->memory_base;
5379 
5380         /* Test data lines with test pattern at one location. */
5381 
5382         for ( i = 0 ; i < count ; i++ ) {
5383                 *addr = testval[i];
5384                 if ( *addr != testval[i] )
5385                         return false;
5386         }
5387 
5388         /* Test address lines with incrementing pattern over */
5389         /* entire address range. */
5390 
5391         for ( i = 0 ; i < limit ; i++ ) {
5392                 *addr = i * 4;
5393                 addr++;
5394         }
5395 
5396         addr = (unsigned long *)info->memory_base;
5397 
5398         for ( i = 0 ; i < limit ; i++ ) {
5399                 if ( *addr != i * 4 )
5400                         return false;
5401                 addr++;
5402         }
5403 
5404         memset( info->memory_base, 0, SCA_MEM_SIZE );
5405         return true;
5406 }
5407 
5408 /* Load data into PCI adapter shared memory.
5409  *
5410  * The PCI9050 releases control of the local bus
5411  * after completing the current read or write operation.
5412  *
5413  * While the PCI9050 write FIFO not empty, the
5414  * PCI9050 treats all of the writes as a single transaction
5415  * and does not release the bus. This causes DMA latency problems
5416  * at high speeds when copying large data blocks to the shared memory.
5417  *
5418  * This function breaks a write into multiple transations by
5419  * interleaving a read which flushes the write FIFO and 'completes'
5420  * the write transation. This allows any pending DMA request to gain control
5421  * of the local bus in a timely fasion.
5422  */
5423 static void load_pci_memory(SLMP_INFO *info, char* dest, const char* src, unsigned short count)
5424 {
5425         /* A load interval of 16 allows for 4 32-bit writes at */
5426         /* 136ns each for a maximum latency of 542ns on the local bus.*/
5427 
5428         unsigned short interval = count / sca_pci_load_interval;
5429         unsigned short i;
5430 
5431         for ( i = 0 ; i < interval ; i++ )
5432         {
5433                 memcpy(dest, src, sca_pci_load_interval);
5434                 read_status_reg(info);
5435                 dest += sca_pci_load_interval;
5436                 src += sca_pci_load_interval;
5437         }
5438 
5439         memcpy(dest, src, count % sca_pci_load_interval);
5440 }
5441 
5442 static void trace_block(SLMP_INFO *info,const char* data, int count, int xmit)
5443 {
5444         int i;
5445         int linecount;
5446         if (xmit)
5447                 printk("%s tx data:\n",info->device_name);
5448         else
5449                 printk("%s rx data:\n",info->device_name);
5450 
5451         while(count) {
5452                 if (count > 16)
5453                         linecount = 16;
5454                 else
5455                         linecount = count;
5456 
5457                 for(i=0;i<linecount;i++)
5458                         printk("%02X ",(unsigned char)data[i]);
5459                 for(;i<17;i++)
5460                         printk("   ");
5461                 for(i=0;i<linecount;i++) {
5462                         if (data[i]>=040 && data[i]<=0176)
5463                                 printk("%c",data[i]);
5464                         else
5465                                 printk(".");
5466                 }
5467                 printk("\n");
5468 
5469                 data  += linecount;
5470                 count -= linecount;
5471         }
5472 }       /* end of trace_block() */
5473 
5474 /* called when HDLC frame times out
5475  * update stats and do tx completion processing
5476  */
5477 static void tx_timeout(unsigned long context)
5478 {
5479         SLMP_INFO *info = (SLMP_INFO*)context;
5480         unsigned long flags;
5481 
5482         if ( debug_level >= DEBUG_LEVEL_INFO )
5483                 printk( "%s(%d):%s tx_timeout()\n",
5484                         __FILE__,__LINE__,info->device_name);
5485         if(info->tx_active && info->params.mode == MGSL_MODE_HDLC) {
5486                 info->icount.txtimeout++;
5487         }
5488         spin_lock_irqsave(&info->lock,flags);
5489         info->tx_active = false;
5490         info->tx_count = info->tx_put = info->tx_get = 0;
5491 
5492         spin_unlock_irqrestore(&info->lock,flags);
5493 
5494 #if SYNCLINK_GENERIC_HDLC
5495         if (info->netcount)
5496                 hdlcdev_tx_done(info);
5497         else
5498 #endif
5499                 bh_transmit(info);
5500 }
5501 
5502 /* called to periodically check the DSR/RI modem signal input status
5503  */
5504 static void status_timeout(unsigned long context)
5505 {
5506         u16 status = 0;
5507         SLMP_INFO *info = (SLMP_INFO*)context;
5508         unsigned long flags;
5509         unsigned char delta;
5510 
5511 
5512         spin_lock_irqsave(&info->lock,flags);
5513         get_signals(info);
5514         spin_unlock_irqrestore(&info->lock,flags);
5515 
5516         /* check for DSR/RI state change */
5517 
5518         delta = info->old_signals ^ info->serial_signals;
5519         info->old_signals = info->serial_signals;
5520 
5521         if (delta & SerialSignal_DSR)
5522                 status |= MISCSTATUS_DSR_LATCHED|(info->serial_signals&SerialSignal_DSR);
5523 
5524         if (delta & SerialSignal_RI)
5525                 status |= MISCSTATUS_RI_LATCHED|(info->serial_signals&SerialSignal_RI);
5526 
5527         if (delta & SerialSignal_DCD)
5528                 status |= MISCSTATUS_DCD_LATCHED|(info->serial_signals&SerialSignal_DCD);
5529 
5530         if (delta & SerialSignal_CTS)
5531                 status |= MISCSTATUS_CTS_LATCHED|(info->serial_signals&SerialSignal_CTS);
5532 
5533         if (status)
5534                 isr_io_pin(info,status);
5535 
5536         mod_timer(&info->status_timer, jiffies + msecs_to_jiffies(10));
5537 }
5538 
5539 
5540 /* Register Access Routines -
5541  * All registers are memory mapped
5542  */
5543 #define CALC_REGADDR() \
5544         unsigned char * RegAddr = (unsigned char*)(info->sca_base + Addr); \
5545         if (info->port_num > 1) \
5546                 RegAddr += 256;                 /* port 0-1 SCA0, 2-3 SCA1 */ \
5547         if ( info->port_num & 1) { \
5548                 if (Addr > 0x7f) \
5549                         RegAddr += 0x40;        /* DMA access */ \
5550                 else if (Addr > 0x1f && Addr < 0x60) \
5551                         RegAddr += 0x20;        /* MSCI access */ \
5552         }
5553 
5554 
5555 static unsigned char read_reg(SLMP_INFO * info, unsigned char Addr)
5556 {
5557         CALC_REGADDR();
5558         return *RegAddr;
5559 }
5560 static void write_reg(SLMP_INFO * info, unsigned char Addr, unsigned char Value)
5561 {
5562         CALC_REGADDR();
5563         *RegAddr = Value;
5564 }
5565 
5566 static u16 read_reg16(SLMP_INFO * info, unsigned char Addr)
5567 {
5568         CALC_REGADDR();
5569         return *((u16 *)RegAddr);
5570 }
5571 
5572 static void write_reg16(SLMP_INFO * info, unsigned char Addr, u16 Value)
5573 {
5574         CALC_REGADDR();
5575         *((u16 *)RegAddr) = Value;
5576 }
5577 
5578 static unsigned char read_status_reg(SLMP_INFO * info)
5579 {
5580         unsigned char *RegAddr = (unsigned char *)info->statctrl_base;
5581         return *RegAddr;
5582 }
5583 
5584 static void write_control_reg(SLMP_INFO * info)
5585 {
5586         unsigned char *RegAddr = (unsigned char *)info->statctrl_base;
5587         *RegAddr = info->port_array[0]->ctrlreg_value;
5588 }
5589 
5590 
5591 static int synclinkmp_init_one (struct pci_dev *dev,
5592                                           const struct pci_device_id *ent)
5593 {
5594         if (pci_enable_device(dev)) {
5595                 printk("error enabling pci device %p\n", dev);
5596                 return -EIO;
5597         }
5598         device_init( ++synclinkmp_adapter_count, dev );
5599         return 0;
5600 }
5601 
5602 static void synclinkmp_remove_one (struct pci_dev *dev)
5603 {
5604 }
5605 

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