Version:  2.0.40 2.2.26 2.4.37 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6

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 int  add_device(SLMP_INFO *info);
553 static int  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         info->port.low_latency = (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
756 
757         spin_lock_irqsave(&info->netlock, flags);
758         if (info->netcount) {
759                 retval = -EBUSY;
760                 spin_unlock_irqrestore(&info->netlock, flags);
761                 goto cleanup;
762         }
763         info->port.count++;
764         spin_unlock_irqrestore(&info->netlock, flags);
765 
766         if (info->port.count == 1) {
767                 /* 1st open on this device, init hardware */
768                 retval = startup(info);
769                 if (retval < 0)
770                         goto cleanup;
771         }
772 
773         retval = block_til_ready(tty, filp, info);
774         if (retval) {
775                 if (debug_level >= DEBUG_LEVEL_INFO)
776                         printk("%s(%d):%s block_til_ready() returned %d\n",
777                                  __FILE__,__LINE__, info->device_name, retval);
778                 goto cleanup;
779         }
780 
781         if (debug_level >= DEBUG_LEVEL_INFO)
782                 printk("%s(%d):%s open() success\n",
783                          __FILE__,__LINE__, info->device_name);
784         retval = 0;
785 
786 cleanup:
787         if (retval) {
788                 if (tty->count == 1)
789                         info->port.tty = NULL; /* tty layer will release tty struct */
790                 if(info->port.count)
791                         info->port.count--;
792         }
793 
794         return retval;
795 }
796 
797 /* Called when port is closed. Wait for remaining data to be
798  * sent. Disable port and free resources.
799  */
800 static void close(struct tty_struct *tty, struct file *filp)
801 {
802         SLMP_INFO * info = tty->driver_data;
803 
804         if (sanity_check(info, tty->name, "close"))
805                 return;
806 
807         if (debug_level >= DEBUG_LEVEL_INFO)
808                 printk("%s(%d):%s close() entry, count=%d\n",
809                          __FILE__,__LINE__, info->device_name, info->port.count);
810 
811         if (tty_port_close_start(&info->port, tty, filp) == 0)
812                 goto cleanup;
813 
814         mutex_lock(&info->port.mutex);
815         if (info->port.flags & ASYNC_INITIALIZED)
816                 wait_until_sent(tty, info->timeout);
817 
818         flush_buffer(tty);
819         tty_ldisc_flush(tty);
820         shutdown(info);
821         mutex_unlock(&info->port.mutex);
822 
823         tty_port_close_end(&info->port, tty);
824         info->port.tty = NULL;
825 cleanup:
826         if (debug_level >= DEBUG_LEVEL_INFO)
827                 printk("%s(%d):%s close() exit, count=%d\n", __FILE__,__LINE__,
828                         tty->driver->name, info->port.count);
829 }
830 
831 /* Called by tty_hangup() when a hangup is signaled.
832  * This is the same as closing all open descriptors for the port.
833  */
834 static void hangup(struct tty_struct *tty)
835 {
836         SLMP_INFO *info = tty->driver_data;
837         unsigned long flags;
838 
839         if (debug_level >= DEBUG_LEVEL_INFO)
840                 printk("%s(%d):%s hangup()\n",
841                          __FILE__,__LINE__, info->device_name );
842 
843         if (sanity_check(info, tty->name, "hangup"))
844                 return;
845 
846         mutex_lock(&info->port.mutex);
847         flush_buffer(tty);
848         shutdown(info);
849 
850         spin_lock_irqsave(&info->port.lock, flags);
851         info->port.count = 0;
852         info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
853         info->port.tty = NULL;
854         spin_unlock_irqrestore(&info->port.lock, flags);
855         mutex_unlock(&info->port.mutex);
856 
857         wake_up_interruptible(&info->port.open_wait);
858 }
859 
860 /* Set new termios settings
861  */
862 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios)
863 {
864         SLMP_INFO *info = tty->driver_data;
865         unsigned long flags;
866 
867         if (debug_level >= DEBUG_LEVEL_INFO)
868                 printk("%s(%d):%s set_termios()\n", __FILE__,__LINE__,
869                         tty->driver->name );
870 
871         change_params(info);
872 
873         /* Handle transition to B0 status */
874         if ((old_termios->c_cflag & CBAUD) && !C_BAUD(tty)) {
875                 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
876                 spin_lock_irqsave(&info->lock,flags);
877                 set_signals(info);
878                 spin_unlock_irqrestore(&info->lock,flags);
879         }
880 
881         /* Handle transition away from B0 status */
882         if (!(old_termios->c_cflag & CBAUD) && C_BAUD(tty)) {
883                 info->serial_signals |= SerialSignal_DTR;
884                 if (!C_CRTSCTS(tty) || !test_bit(TTY_THROTTLED, &tty->flags))
885                         info->serial_signals |= SerialSignal_RTS;
886                 spin_lock_irqsave(&info->lock,flags);
887                 set_signals(info);
888                 spin_unlock_irqrestore(&info->lock,flags);
889         }
890 
891         /* Handle turning off CRTSCTS */
892         if (old_termios->c_cflag & CRTSCTS && !C_CRTSCTS(tty)) {
893                 tty->hw_stopped = 0;
894                 tx_release(tty);
895         }
896 }
897 
898 /* Send a block of data
899  *
900  * Arguments:
901  *
902  *      tty             pointer to tty information structure
903  *      buf             pointer to buffer containing send data
904  *      count           size of send data in bytes
905  *
906  * Return Value:        number of characters written
907  */
908 static int write(struct tty_struct *tty,
909                  const unsigned char *buf, int count)
910 {
911         int     c, ret = 0;
912         SLMP_INFO *info = tty->driver_data;
913         unsigned long flags;
914 
915         if (debug_level >= DEBUG_LEVEL_INFO)
916                 printk("%s(%d):%s write() count=%d\n",
917                        __FILE__,__LINE__,info->device_name,count);
918 
919         if (sanity_check(info, tty->name, "write"))
920                 goto cleanup;
921 
922         if (!info->tx_buf)
923                 goto cleanup;
924 
925         if (info->params.mode == MGSL_MODE_HDLC) {
926                 if (count > info->max_frame_size) {
927                         ret = -EIO;
928                         goto cleanup;
929                 }
930                 if (info->tx_active)
931                         goto cleanup;
932                 if (info->tx_count) {
933                         /* send accumulated data from send_char() calls */
934                         /* as frame and wait before accepting more data. */
935                         tx_load_dma_buffer(info, info->tx_buf, info->tx_count);
936                         goto start;
937                 }
938                 ret = info->tx_count = count;
939                 tx_load_dma_buffer(info, buf, count);
940                 goto start;
941         }
942 
943         for (;;) {
944                 c = min_t(int, count,
945                         min(info->max_frame_size - info->tx_count - 1,
946                             info->max_frame_size - info->tx_put));
947                 if (c <= 0)
948                         break;
949                         
950                 memcpy(info->tx_buf + info->tx_put, buf, c);
951 
952                 spin_lock_irqsave(&info->lock,flags);
953                 info->tx_put += c;
954                 if (info->tx_put >= info->max_frame_size)
955                         info->tx_put -= info->max_frame_size;
956                 info->tx_count += c;
957                 spin_unlock_irqrestore(&info->lock,flags);
958 
959                 buf += c;
960                 count -= c;
961                 ret += c;
962         }
963 
964         if (info->params.mode == MGSL_MODE_HDLC) {
965                 if (count) {
966                         ret = info->tx_count = 0;
967                         goto cleanup;
968                 }
969                 tx_load_dma_buffer(info, info->tx_buf, info->tx_count);
970         }
971 start:
972         if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
973                 spin_lock_irqsave(&info->lock,flags);
974                 if (!info->tx_active)
975                         tx_start(info);
976                 spin_unlock_irqrestore(&info->lock,flags);
977         }
978 
979 cleanup:
980         if (debug_level >= DEBUG_LEVEL_INFO)
981                 printk( "%s(%d):%s write() returning=%d\n",
982                         __FILE__,__LINE__,info->device_name,ret);
983         return ret;
984 }
985 
986 /* Add a character to the transmit buffer.
987  */
988 static int put_char(struct tty_struct *tty, unsigned char ch)
989 {
990         SLMP_INFO *info = tty->driver_data;
991         unsigned long flags;
992         int ret = 0;
993 
994         if ( debug_level >= DEBUG_LEVEL_INFO ) {
995                 printk( "%s(%d):%s put_char(%d)\n",
996                         __FILE__,__LINE__,info->device_name,ch);
997         }
998 
999         if (sanity_check(info, tty->name, "put_char"))
1000                 return 0;
1001 
1002         if (!info->tx_buf)
1003                 return 0;
1004 
1005         spin_lock_irqsave(&info->lock,flags);
1006 
1007         if ( (info->params.mode != MGSL_MODE_HDLC) ||
1008              !info->tx_active ) {
1009 
1010                 if (info->tx_count < info->max_frame_size - 1) {
1011                         info->tx_buf[info->tx_put++] = ch;
1012                         if (info->tx_put >= info->max_frame_size)
1013                                 info->tx_put -= info->max_frame_size;
1014                         info->tx_count++;
1015                         ret = 1;
1016                 }
1017         }
1018 
1019         spin_unlock_irqrestore(&info->lock,flags);
1020         return ret;
1021 }
1022 
1023 /* Send a high-priority XON/XOFF character
1024  */
1025 static void send_xchar(struct tty_struct *tty, char ch)
1026 {
1027         SLMP_INFO *info = tty->driver_data;
1028         unsigned long flags;
1029 
1030         if (debug_level >= DEBUG_LEVEL_INFO)
1031                 printk("%s(%d):%s send_xchar(%d)\n",
1032                          __FILE__,__LINE__, info->device_name, ch );
1033 
1034         if (sanity_check(info, tty->name, "send_xchar"))
1035                 return;
1036 
1037         info->x_char = ch;
1038         if (ch) {
1039                 /* Make sure transmit interrupts are on */
1040                 spin_lock_irqsave(&info->lock,flags);
1041                 if (!info->tx_enabled)
1042                         tx_start(info);
1043                 spin_unlock_irqrestore(&info->lock,flags);
1044         }
1045 }
1046 
1047 /* Wait until the transmitter is empty.
1048  */
1049 static void wait_until_sent(struct tty_struct *tty, int timeout)
1050 {
1051         SLMP_INFO * info = tty->driver_data;
1052         unsigned long orig_jiffies, char_time;
1053 
1054         if (!info )
1055                 return;
1056 
1057         if (debug_level >= DEBUG_LEVEL_INFO)
1058                 printk("%s(%d):%s wait_until_sent() entry\n",
1059                          __FILE__,__LINE__, info->device_name );
1060 
1061         if (sanity_check(info, tty->name, "wait_until_sent"))
1062                 return;
1063 
1064         if (!test_bit(ASYNCB_INITIALIZED, &info->port.flags))
1065                 goto exit;
1066 
1067         orig_jiffies = jiffies;
1068 
1069         /* Set check interval to 1/5 of estimated time to
1070          * send a character, and make it at least 1. The check
1071          * interval should also be less than the timeout.
1072          * Note: use tight timings here to satisfy the NIST-PCTS.
1073          */
1074 
1075         if ( info->params.data_rate ) {
1076                 char_time = info->timeout/(32 * 5);
1077                 if (!char_time)
1078                         char_time++;
1079         } else
1080                 char_time = 1;
1081 
1082         if (timeout)
1083                 char_time = min_t(unsigned long, char_time, timeout);
1084 
1085         if ( info->params.mode == MGSL_MODE_HDLC ) {
1086                 while (info->tx_active) {
1087                         msleep_interruptible(jiffies_to_msecs(char_time));
1088                         if (signal_pending(current))
1089                                 break;
1090                         if (timeout && time_after(jiffies, orig_jiffies + timeout))
1091                                 break;
1092                 }
1093         } else {
1094                 /*
1095                  * TODO: determine if there is something similar to USC16C32
1096                  *       TXSTATUS_ALL_SENT status
1097                  */
1098                 while ( info->tx_active && info->tx_enabled) {
1099                         msleep_interruptible(jiffies_to_msecs(char_time));
1100                         if (signal_pending(current))
1101                                 break;
1102                         if (timeout && time_after(jiffies, orig_jiffies + timeout))
1103                                 break;
1104                 }
1105         }
1106 
1107 exit:
1108         if (debug_level >= DEBUG_LEVEL_INFO)
1109                 printk("%s(%d):%s wait_until_sent() exit\n",
1110                          __FILE__,__LINE__, info->device_name );
1111 }
1112 
1113 /* Return the count of free bytes in transmit buffer
1114  */
1115 static int write_room(struct tty_struct *tty)
1116 {
1117         SLMP_INFO *info = tty->driver_data;
1118         int ret;
1119 
1120         if (sanity_check(info, tty->name, "write_room"))
1121                 return 0;
1122 
1123         if (info->params.mode == MGSL_MODE_HDLC) {
1124                 ret = (info->tx_active) ? 0 : HDLC_MAX_FRAME_SIZE;
1125         } else {
1126                 ret = info->max_frame_size - info->tx_count - 1;
1127                 if (ret < 0)
1128                         ret = 0;
1129         }
1130 
1131         if (debug_level >= DEBUG_LEVEL_INFO)
1132                 printk("%s(%d):%s write_room()=%d\n",
1133                        __FILE__, __LINE__, info->device_name, ret);
1134 
1135         return ret;
1136 }
1137 
1138 /* enable transmitter and send remaining buffered characters
1139  */
1140 static void flush_chars(struct tty_struct *tty)
1141 {
1142         SLMP_INFO *info = tty->driver_data;
1143         unsigned long flags;
1144 
1145         if ( debug_level >= DEBUG_LEVEL_INFO )
1146                 printk( "%s(%d):%s flush_chars() entry tx_count=%d\n",
1147                         __FILE__,__LINE__,info->device_name,info->tx_count);
1148 
1149         if (sanity_check(info, tty->name, "flush_chars"))
1150                 return;
1151 
1152         if (info->tx_count <= 0 || tty->stopped || tty->hw_stopped ||
1153             !info->tx_buf)
1154                 return;
1155 
1156         if ( debug_level >= DEBUG_LEVEL_INFO )
1157                 printk( "%s(%d):%s flush_chars() entry, starting transmitter\n",
1158                         __FILE__,__LINE__,info->device_name );
1159 
1160         spin_lock_irqsave(&info->lock,flags);
1161 
1162         if (!info->tx_active) {
1163                 if ( (info->params.mode == MGSL_MODE_HDLC) &&
1164                         info->tx_count ) {
1165                         /* operating in synchronous (frame oriented) mode */
1166                         /* copy data from circular tx_buf to */
1167                         /* transmit DMA buffer. */
1168                         tx_load_dma_buffer(info,
1169                                  info->tx_buf,info->tx_count);
1170                 }
1171                 tx_start(info);
1172         }
1173 
1174         spin_unlock_irqrestore(&info->lock,flags);
1175 }
1176 
1177 /* Discard all data in the send buffer
1178  */
1179 static void flush_buffer(struct tty_struct *tty)
1180 {
1181         SLMP_INFO *info = tty->driver_data;
1182         unsigned long flags;
1183 
1184         if (debug_level >= DEBUG_LEVEL_INFO)
1185                 printk("%s(%d):%s flush_buffer() entry\n",
1186                          __FILE__,__LINE__, info->device_name );
1187 
1188         if (sanity_check(info, tty->name, "flush_buffer"))
1189                 return;
1190 
1191         spin_lock_irqsave(&info->lock,flags);
1192         info->tx_count = info->tx_put = info->tx_get = 0;
1193         del_timer(&info->tx_timer);
1194         spin_unlock_irqrestore(&info->lock,flags);
1195 
1196         tty_wakeup(tty);
1197 }
1198 
1199 /* throttle (stop) transmitter
1200  */
1201 static void tx_hold(struct tty_struct *tty)
1202 {
1203         SLMP_INFO *info = tty->driver_data;
1204         unsigned long flags;
1205 
1206         if (sanity_check(info, tty->name, "tx_hold"))
1207                 return;
1208 
1209         if ( debug_level >= DEBUG_LEVEL_INFO )
1210                 printk("%s(%d):%s tx_hold()\n",
1211                         __FILE__,__LINE__,info->device_name);
1212 
1213         spin_lock_irqsave(&info->lock,flags);
1214         if (info->tx_enabled)
1215                 tx_stop(info);
1216         spin_unlock_irqrestore(&info->lock,flags);
1217 }
1218 
1219 /* release (start) transmitter
1220  */
1221 static void tx_release(struct tty_struct *tty)
1222 {
1223         SLMP_INFO *info = tty->driver_data;
1224         unsigned long flags;
1225 
1226         if (sanity_check(info, tty->name, "tx_release"))
1227                 return;
1228 
1229         if ( debug_level >= DEBUG_LEVEL_INFO )
1230                 printk("%s(%d):%s tx_release()\n",
1231                         __FILE__,__LINE__,info->device_name);
1232 
1233         spin_lock_irqsave(&info->lock,flags);
1234         if (!info->tx_enabled)
1235                 tx_start(info);
1236         spin_unlock_irqrestore(&info->lock,flags);
1237 }
1238 
1239 /* Service an IOCTL request
1240  *
1241  * Arguments:
1242  *
1243  *      tty     pointer to tty instance data
1244  *      cmd     IOCTL command code
1245  *      arg     command argument/context
1246  *
1247  * Return Value:        0 if success, otherwise error code
1248  */
1249 static int ioctl(struct tty_struct *tty,
1250                  unsigned int cmd, unsigned long arg)
1251 {
1252         SLMP_INFO *info = tty->driver_data;
1253         void __user *argp = (void __user *)arg;
1254 
1255         if (debug_level >= DEBUG_LEVEL_INFO)
1256                 printk("%s(%d):%s ioctl() cmd=%08X\n", __FILE__,__LINE__,
1257                         info->device_name, cmd );
1258 
1259         if (sanity_check(info, tty->name, "ioctl"))
1260                 return -ENODEV;
1261 
1262         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1263             (cmd != TIOCMIWAIT)) {
1264                 if (tty->flags & (1 << TTY_IO_ERROR))
1265                     return -EIO;
1266         }
1267 
1268         switch (cmd) {
1269         case MGSL_IOCGPARAMS:
1270                 return get_params(info, argp);
1271         case MGSL_IOCSPARAMS:
1272                 return set_params(info, argp);
1273         case MGSL_IOCGTXIDLE:
1274                 return get_txidle(info, argp);
1275         case MGSL_IOCSTXIDLE:
1276                 return set_txidle(info, (int)arg);
1277         case MGSL_IOCTXENABLE:
1278                 return tx_enable(info, (int)arg);
1279         case MGSL_IOCRXENABLE:
1280                 return rx_enable(info, (int)arg);
1281         case MGSL_IOCTXABORT:
1282                 return tx_abort(info);
1283         case MGSL_IOCGSTATS:
1284                 return get_stats(info, argp);
1285         case MGSL_IOCWAITEVENT:
1286                 return wait_mgsl_event(info, argp);
1287         case MGSL_IOCLOOPTXDONE:
1288                 return 0; // TODO: Not supported, need to document
1289                 /* Wait for modem input (DCD,RI,DSR,CTS) change
1290                  * as specified by mask in arg (TIOCM_RNG/DSR/CD/CTS)
1291                  */
1292         case TIOCMIWAIT:
1293                 return modem_input_wait(info,(int)arg);
1294                 
1295                 /*
1296                  * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1297                  * Return: write counters to the user passed counter struct
1298                  * NB: both 1->0 and 0->1 transitions are counted except for
1299                  *     RI where only 0->1 is counted.
1300                  */
1301         default:
1302                 return -ENOIOCTLCMD;
1303         }
1304         return 0;
1305 }
1306 
1307 static int get_icount(struct tty_struct *tty,
1308                                 struct serial_icounter_struct *icount)
1309 {
1310         SLMP_INFO *info = tty->driver_data;
1311         struct mgsl_icount cnow;        /* kernel counter temps */
1312         unsigned long flags;
1313 
1314         spin_lock_irqsave(&info->lock,flags);
1315         cnow = info->icount;
1316         spin_unlock_irqrestore(&info->lock,flags);
1317 
1318         icount->cts = cnow.cts;
1319         icount->dsr = cnow.dsr;
1320         icount->rng = cnow.rng;
1321         icount->dcd = cnow.dcd;
1322         icount->rx = cnow.rx;
1323         icount->tx = cnow.tx;
1324         icount->frame = cnow.frame;
1325         icount->overrun = cnow.overrun;
1326         icount->parity = cnow.parity;
1327         icount->brk = cnow.brk;
1328         icount->buf_overrun = cnow.buf_overrun;
1329 
1330         return 0;
1331 }
1332 
1333 /*
1334  * /proc fs routines....
1335  */
1336 
1337 static inline void line_info(struct seq_file *m, SLMP_INFO *info)
1338 {
1339         char    stat_buf[30];
1340         unsigned long flags;
1341 
1342         seq_printf(m, "%s: SCABase=%08x Mem=%08X StatusControl=%08x LCR=%08X\n"
1343                        "\tIRQ=%d MaxFrameSize=%u\n",
1344                 info->device_name,
1345                 info->phys_sca_base,
1346                 info->phys_memory_base,
1347                 info->phys_statctrl_base,
1348                 info->phys_lcr_base,
1349                 info->irq_level,
1350                 info->max_frame_size );
1351 
1352         /* output current serial signal states */
1353         spin_lock_irqsave(&info->lock,flags);
1354         get_signals(info);
1355         spin_unlock_irqrestore(&info->lock,flags);
1356 
1357         stat_buf[0] = 0;
1358         stat_buf[1] = 0;
1359         if (info->serial_signals & SerialSignal_RTS)
1360                 strcat(stat_buf, "|RTS");
1361         if (info->serial_signals & SerialSignal_CTS)
1362                 strcat(stat_buf, "|CTS");
1363         if (info->serial_signals & SerialSignal_DTR)
1364                 strcat(stat_buf, "|DTR");
1365         if (info->serial_signals & SerialSignal_DSR)
1366                 strcat(stat_buf, "|DSR");
1367         if (info->serial_signals & SerialSignal_DCD)
1368                 strcat(stat_buf, "|CD");
1369         if (info->serial_signals & SerialSignal_RI)
1370                 strcat(stat_buf, "|RI");
1371 
1372         if (info->params.mode == MGSL_MODE_HDLC) {
1373                 seq_printf(m, "\tHDLC txok:%d rxok:%d",
1374                               info->icount.txok, info->icount.rxok);
1375                 if (info->icount.txunder)
1376                         seq_printf(m, " txunder:%d", info->icount.txunder);
1377                 if (info->icount.txabort)
1378                         seq_printf(m, " txabort:%d", info->icount.txabort);
1379                 if (info->icount.rxshort)
1380                         seq_printf(m, " rxshort:%d", info->icount.rxshort);
1381                 if (info->icount.rxlong)
1382                         seq_printf(m, " rxlong:%d", info->icount.rxlong);
1383                 if (info->icount.rxover)
1384                         seq_printf(m, " rxover:%d", info->icount.rxover);
1385                 if (info->icount.rxcrc)
1386                         seq_printf(m, " rxlong:%d", info->icount.rxcrc);
1387         } else {
1388                 seq_printf(m, "\tASYNC tx:%d rx:%d",
1389                               info->icount.tx, info->icount.rx);
1390                 if (info->icount.frame)
1391                         seq_printf(m, " fe:%d", info->icount.frame);
1392                 if (info->icount.parity)
1393                         seq_printf(m, " pe:%d", info->icount.parity);
1394                 if (info->icount.brk)
1395                         seq_printf(m, " brk:%d", info->icount.brk);
1396                 if (info->icount.overrun)
1397                         seq_printf(m, " oe:%d", info->icount.overrun);
1398         }
1399 
1400         /* Append serial signal status to end */
1401         seq_printf(m, " %s\n", stat_buf+1);
1402 
1403         seq_printf(m, "\ttxactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
1404          info->tx_active,info->bh_requested,info->bh_running,
1405          info->pending_bh);
1406 }
1407 
1408 /* Called to print information about devices
1409  */
1410 static int synclinkmp_proc_show(struct seq_file *m, void *v)
1411 {
1412         SLMP_INFO *info;
1413 
1414         seq_printf(m, "synclinkmp driver:%s\n", driver_version);
1415 
1416         info = synclinkmp_device_list;
1417         while( info ) {
1418                 line_info(m, info);
1419                 info = info->next_device;
1420         }
1421         return 0;
1422 }
1423 
1424 static int synclinkmp_proc_open(struct inode *inode, struct file *file)
1425 {
1426         return single_open(file, synclinkmp_proc_show, NULL);
1427 }
1428 
1429 static const struct file_operations synclinkmp_proc_fops = {
1430         .owner          = THIS_MODULE,
1431         .open           = synclinkmp_proc_open,
1432         .read           = seq_read,
1433         .llseek         = seq_lseek,
1434         .release        = single_release,
1435 };
1436 
1437 /* Return the count of bytes in transmit buffer
1438  */
1439 static int chars_in_buffer(struct tty_struct *tty)
1440 {
1441         SLMP_INFO *info = tty->driver_data;
1442 
1443         if (sanity_check(info, tty->name, "chars_in_buffer"))
1444                 return 0;
1445 
1446         if (debug_level >= DEBUG_LEVEL_INFO)
1447                 printk("%s(%d):%s chars_in_buffer()=%d\n",
1448                        __FILE__, __LINE__, info->device_name, info->tx_count);
1449 
1450         return info->tx_count;
1451 }
1452 
1453 /* Signal remote device to throttle send data (our receive data)
1454  */
1455 static void throttle(struct tty_struct * tty)
1456 {
1457         SLMP_INFO *info = tty->driver_data;
1458         unsigned long flags;
1459 
1460         if (debug_level >= DEBUG_LEVEL_INFO)
1461                 printk("%s(%d):%s throttle() entry\n",
1462                          __FILE__,__LINE__, info->device_name );
1463 
1464         if (sanity_check(info, tty->name, "throttle"))
1465                 return;
1466 
1467         if (I_IXOFF(tty))
1468                 send_xchar(tty, STOP_CHAR(tty));
1469 
1470         if (C_CRTSCTS(tty)) {
1471                 spin_lock_irqsave(&info->lock,flags);
1472                 info->serial_signals &= ~SerialSignal_RTS;
1473                 set_signals(info);
1474                 spin_unlock_irqrestore(&info->lock,flags);
1475         }
1476 }
1477 
1478 /* Signal remote device to stop throttling send data (our receive data)
1479  */
1480 static void unthrottle(struct tty_struct * tty)
1481 {
1482         SLMP_INFO *info = tty->driver_data;
1483         unsigned long flags;
1484 
1485         if (debug_level >= DEBUG_LEVEL_INFO)
1486                 printk("%s(%d):%s unthrottle() entry\n",
1487                          __FILE__,__LINE__, info->device_name );
1488 
1489         if (sanity_check(info, tty->name, "unthrottle"))
1490                 return;
1491 
1492         if (I_IXOFF(tty)) {
1493                 if (info->x_char)
1494                         info->x_char = 0;
1495                 else
1496                         send_xchar(tty, START_CHAR(tty));
1497         }
1498 
1499         if (C_CRTSCTS(tty)) {
1500                 spin_lock_irqsave(&info->lock,flags);
1501                 info->serial_signals |= SerialSignal_RTS;
1502                 set_signals(info);
1503                 spin_unlock_irqrestore(&info->lock,flags);
1504         }
1505 }
1506 
1507 /* set or clear transmit break condition
1508  * break_state  -1=set break condition, 0=clear
1509  */
1510 static int set_break(struct tty_struct *tty, int break_state)
1511 {
1512         unsigned char RegValue;
1513         SLMP_INFO * info = tty->driver_data;
1514         unsigned long flags;
1515 
1516         if (debug_level >= DEBUG_LEVEL_INFO)
1517                 printk("%s(%d):%s set_break(%d)\n",
1518                          __FILE__,__LINE__, info->device_name, break_state);
1519 
1520         if (sanity_check(info, tty->name, "set_break"))
1521                 return -EINVAL;
1522 
1523         spin_lock_irqsave(&info->lock,flags);
1524         RegValue = read_reg(info, CTL);
1525         if (break_state == -1)
1526                 RegValue |= BIT3;
1527         else
1528                 RegValue &= ~BIT3;
1529         write_reg(info, CTL, RegValue);
1530         spin_unlock_irqrestore(&info->lock,flags);
1531         return 0;
1532 }
1533 
1534 #if SYNCLINK_GENERIC_HDLC
1535 
1536 /**
1537  * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
1538  * set encoding and frame check sequence (FCS) options
1539  *
1540  * dev       pointer to network device structure
1541  * encoding  serial encoding setting
1542  * parity    FCS setting
1543  *
1544  * returns 0 if success, otherwise error code
1545  */
1546 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
1547                           unsigned short parity)
1548 {
1549         SLMP_INFO *info = dev_to_port(dev);
1550         unsigned char  new_encoding;
1551         unsigned short new_crctype;
1552 
1553         /* return error if TTY interface open */
1554         if (info->port.count)
1555                 return -EBUSY;
1556 
1557         switch (encoding)
1558         {
1559         case ENCODING_NRZ:        new_encoding = HDLC_ENCODING_NRZ; break;
1560         case ENCODING_NRZI:       new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
1561         case ENCODING_FM_MARK:    new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
1562         case ENCODING_FM_SPACE:   new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
1563         case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
1564         default: return -EINVAL;
1565         }
1566 
1567         switch (parity)
1568         {
1569         case PARITY_NONE:            new_crctype = HDLC_CRC_NONE; break;
1570         case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
1571         case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
1572         default: return -EINVAL;
1573         }
1574 
1575         info->params.encoding = new_encoding;
1576         info->params.crc_type = new_crctype;
1577 
1578         /* if network interface up, reprogram hardware */
1579         if (info->netcount)
1580                 program_hw(info);
1581 
1582         return 0;
1583 }
1584 
1585 /**
1586  * called by generic HDLC layer to send frame
1587  *
1588  * skb  socket buffer containing HDLC frame
1589  * dev  pointer to network device structure
1590  */
1591 static netdev_tx_t hdlcdev_xmit(struct sk_buff *skb,
1592                                       struct net_device *dev)
1593 {
1594         SLMP_INFO *info = dev_to_port(dev);
1595         unsigned long flags;
1596 
1597         if (debug_level >= DEBUG_LEVEL_INFO)
1598                 printk(KERN_INFO "%s:hdlc_xmit(%s)\n",__FILE__,dev->name);
1599 
1600         /* stop sending until this frame completes */
1601         netif_stop_queue(dev);
1602 
1603         /* copy data to device buffers */
1604         info->tx_count = skb->len;
1605         tx_load_dma_buffer(info, skb->data, skb->len);
1606 
1607         /* update network statistics */
1608         dev->stats.tx_packets++;
1609         dev->stats.tx_bytes += skb->len;
1610 
1611         /* done with socket buffer, so free it */
1612         dev_kfree_skb(skb);
1613 
1614         /* save start time for transmit timeout detection */
1615         dev->trans_start = jiffies;
1616 
1617         /* start hardware transmitter if necessary */
1618         spin_lock_irqsave(&info->lock,flags);
1619         if (!info->tx_active)
1620                 tx_start(info);
1621         spin_unlock_irqrestore(&info->lock,flags);
1622 
1623         return NETDEV_TX_OK;
1624 }
1625 
1626 /**
1627  * called by network layer when interface enabled
1628  * claim resources and initialize hardware
1629  *
1630  * dev  pointer to network device structure
1631  *
1632  * returns 0 if success, otherwise error code
1633  */
1634 static int hdlcdev_open(struct net_device *dev)
1635 {
1636         SLMP_INFO *info = dev_to_port(dev);
1637         int rc;
1638         unsigned long flags;
1639 
1640         if (debug_level >= DEBUG_LEVEL_INFO)
1641                 printk("%s:hdlcdev_open(%s)\n",__FILE__,dev->name);
1642 
1643         /* generic HDLC layer open processing */
1644         rc = hdlc_open(dev);
1645         if (rc)
1646                 return rc;
1647 
1648         /* arbitrate between network and tty opens */
1649         spin_lock_irqsave(&info->netlock, flags);
1650         if (info->port.count != 0 || info->netcount != 0) {
1651                 printk(KERN_WARNING "%s: hdlc_open returning busy\n", dev->name);
1652                 spin_unlock_irqrestore(&info->netlock, flags);
1653                 return -EBUSY;
1654         }
1655         info->netcount=1;
1656         spin_unlock_irqrestore(&info->netlock, flags);
1657 
1658         /* claim resources and init adapter */
1659         if ((rc = startup(info)) != 0) {
1660                 spin_lock_irqsave(&info->netlock, flags);
1661                 info->netcount=0;
1662                 spin_unlock_irqrestore(&info->netlock, flags);
1663                 return rc;
1664         }
1665 
1666         /* assert RTS and DTR, apply hardware settings */
1667         info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR;
1668         program_hw(info);
1669 
1670         /* enable network layer transmit */
1671         dev->trans_start = jiffies;
1672         netif_start_queue(dev);
1673 
1674         /* inform generic HDLC layer of current DCD status */
1675         spin_lock_irqsave(&info->lock, flags);
1676         get_signals(info);
1677         spin_unlock_irqrestore(&info->lock, flags);
1678         if (info->serial_signals & SerialSignal_DCD)
1679                 netif_carrier_on(dev);
1680         else
1681                 netif_carrier_off(dev);
1682         return 0;
1683 }
1684 
1685 /**
1686  * called by network layer when interface is disabled
1687  * shutdown hardware and release resources
1688  *
1689  * dev  pointer to network device structure
1690  *
1691  * returns 0 if success, otherwise error code
1692  */
1693 static int hdlcdev_close(struct net_device *dev)
1694 {
1695         SLMP_INFO *info = dev_to_port(dev);
1696         unsigned long flags;
1697 
1698         if (debug_level >= DEBUG_LEVEL_INFO)
1699                 printk("%s:hdlcdev_close(%s)\n",__FILE__,dev->name);
1700 
1701         netif_stop_queue(dev);
1702 
1703         /* shutdown adapter and release resources */
1704         shutdown(info);
1705 
1706         hdlc_close(dev);
1707 
1708         spin_lock_irqsave(&info->netlock, flags);
1709         info->netcount=0;
1710         spin_unlock_irqrestore(&info->netlock, flags);
1711 
1712         return 0;
1713 }
1714 
1715 /**
1716  * called by network layer to process IOCTL call to network device
1717  *
1718  * dev  pointer to network device structure
1719  * ifr  pointer to network interface request structure
1720  * cmd  IOCTL command code
1721  *
1722  * returns 0 if success, otherwise error code
1723  */
1724 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1725 {
1726         const size_t size = sizeof(sync_serial_settings);
1727         sync_serial_settings new_line;
1728         sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
1729         SLMP_INFO *info = dev_to_port(dev);
1730         unsigned int flags;
1731 
1732         if (debug_level >= DEBUG_LEVEL_INFO)
1733                 printk("%s:hdlcdev_ioctl(%s)\n",__FILE__,dev->name);
1734 
1735         /* return error if TTY interface open */
1736         if (info->port.count)
1737                 return -EBUSY;
1738 
1739         if (cmd != SIOCWANDEV)
1740                 return hdlc_ioctl(dev, ifr, cmd);
1741 
1742         switch(ifr->ifr_settings.type) {
1743         case IF_GET_IFACE: /* return current sync_serial_settings */
1744 
1745                 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
1746                 if (ifr->ifr_settings.size < size) {
1747                         ifr->ifr_settings.size = size; /* data size wanted */
1748                         return -ENOBUFS;
1749                 }
1750 
1751                 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1752                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1753                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1754                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
1755 
1756                 memset(&new_line, 0, sizeof(new_line));
1757                 switch (flags){
1758                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
1759                 case (HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_INT; break;
1760                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_TXINT; break;
1761                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
1762                 default: new_line.clock_type = CLOCK_DEFAULT;
1763                 }
1764 
1765                 new_line.clock_rate = info->params.clock_speed;
1766                 new_line.loopback   = info->params.loopback ? 1:0;
1767 
1768                 if (copy_to_user(line, &new_line, size))
1769                         return -EFAULT;
1770                 return 0;
1771 
1772         case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
1773 
1774                 if(!capable(CAP_NET_ADMIN))
1775                         return -EPERM;
1776                 if (copy_from_user(&new_line, line, size))
1777                         return -EFAULT;
1778 
1779                 switch (new_line.clock_type)
1780                 {
1781                 case CLOCK_EXT:      flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
1782                 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
1783                 case CLOCK_INT:      flags = HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG;    break;
1784                 case CLOCK_TXINT:    flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG;    break;
1785                 case CLOCK_DEFAULT:  flags = info->params.flags &
1786                                              (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1787                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1788                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1789                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN); break;
1790                 default: return -EINVAL;
1791                 }
1792 
1793                 if (new_line.loopback != 0 && new_line.loopback != 1)
1794                         return -EINVAL;
1795 
1796                 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1797                                         HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1798                                         HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1799                                         HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
1800                 info->params.flags |= flags;
1801 
1802                 info->params.loopback = new_line.loopback;
1803 
1804                 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
1805                         info->params.clock_speed = new_line.clock_rate;
1806                 else
1807                         info->params.clock_speed = 0;
1808 
1809                 /* if network interface up, reprogram hardware */
1810                 if (info->netcount)
1811                         program_hw(info);
1812                 return 0;
1813 
1814         default:
1815                 return hdlc_ioctl(dev, ifr, cmd);
1816         }
1817 }
1818 
1819 /**
1820  * called by network layer when transmit timeout is detected
1821  *
1822  * dev  pointer to network device structure
1823  */
1824 static void hdlcdev_tx_timeout(struct net_device *dev)
1825 {
1826         SLMP_INFO *info = dev_to_port(dev);
1827         unsigned long flags;
1828 
1829         if (debug_level >= DEBUG_LEVEL_INFO)
1830                 printk("hdlcdev_tx_timeout(%s)\n",dev->name);
1831 
1832         dev->stats.tx_errors++;
1833         dev->stats.tx_aborted_errors++;
1834 
1835         spin_lock_irqsave(&info->lock,flags);
1836         tx_stop(info);
1837         spin_unlock_irqrestore(&info->lock,flags);
1838 
1839         netif_wake_queue(dev);
1840 }
1841 
1842 /**
1843  * called by device driver when transmit completes
1844  * reenable network layer transmit if stopped
1845  *
1846  * info  pointer to device instance information
1847  */
1848 static void hdlcdev_tx_done(SLMP_INFO *info)
1849 {
1850         if (netif_queue_stopped(info->netdev))
1851                 netif_wake_queue(info->netdev);
1852 }
1853 
1854 /**
1855  * called by device driver when frame received
1856  * pass frame to network layer
1857  *
1858  * info  pointer to device instance information
1859  * buf   pointer to buffer contianing frame data
1860  * size  count of data bytes in buf
1861  */
1862 static void hdlcdev_rx(SLMP_INFO *info, char *buf, int size)
1863 {
1864         struct sk_buff *skb = dev_alloc_skb(size);
1865         struct net_device *dev = info->netdev;
1866 
1867         if (debug_level >= DEBUG_LEVEL_INFO)
1868                 printk("hdlcdev_rx(%s)\n",dev->name);
1869 
1870         if (skb == NULL) {
1871                 printk(KERN_NOTICE "%s: can't alloc skb, dropping packet\n",
1872                        dev->name);
1873                 dev->stats.rx_dropped++;
1874                 return;
1875         }
1876 
1877         memcpy(skb_put(skb, size), buf, size);
1878 
1879         skb->protocol = hdlc_type_trans(skb, dev);
1880 
1881         dev->stats.rx_packets++;
1882         dev->stats.rx_bytes += size;
1883 
1884         netif_rx(skb);
1885 }
1886 
1887 static const struct net_device_ops hdlcdev_ops = {
1888         .ndo_open       = hdlcdev_open,
1889         .ndo_stop       = hdlcdev_close,
1890         .ndo_change_mtu = hdlc_change_mtu,
1891         .ndo_start_xmit = hdlc_start_xmit,
1892         .ndo_do_ioctl   = hdlcdev_ioctl,
1893         .ndo_tx_timeout = hdlcdev_tx_timeout,
1894 };
1895 
1896 /**
1897  * called by device driver when adding device instance
1898  * do generic HDLC initialization
1899  *
1900  * info  pointer to device instance information
1901  *
1902  * returns 0 if success, otherwise error code
1903  */
1904 static int hdlcdev_init(SLMP_INFO *info)
1905 {
1906         int rc;
1907         struct net_device *dev;
1908         hdlc_device *hdlc;
1909 
1910         /* allocate and initialize network and HDLC layer objects */
1911 
1912         dev = alloc_hdlcdev(info);
1913         if (!dev) {
1914                 printk(KERN_ERR "%s:hdlc device allocation failure\n",__FILE__);
1915                 return -ENOMEM;
1916         }
1917 
1918         /* for network layer reporting purposes only */
1919         dev->mem_start = info->phys_sca_base;
1920         dev->mem_end   = info->phys_sca_base + SCA_BASE_SIZE - 1;
1921         dev->irq       = info->irq_level;
1922 
1923         /* network layer callbacks and settings */
1924         dev->netdev_ops     = &hdlcdev_ops;
1925         dev->watchdog_timeo = 10 * HZ;
1926         dev->tx_queue_len   = 50;
1927 
1928         /* generic HDLC layer callbacks and settings */
1929         hdlc         = dev_to_hdlc(dev);
1930         hdlc->attach = hdlcdev_attach;
1931         hdlc->xmit   = hdlcdev_xmit;
1932 
1933         /* register objects with HDLC layer */
1934         rc = register_hdlc_device(dev);
1935         if (rc) {
1936                 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
1937                 free_netdev(dev);
1938                 return rc;
1939         }
1940 
1941         info->netdev = dev;
1942         return 0;
1943 }
1944 
1945 /**
1946  * called by device driver when removing device instance
1947  * do generic HDLC cleanup
1948  *
1949  * info  pointer to device instance information
1950  */
1951 static void hdlcdev_exit(SLMP_INFO *info)
1952 {
1953         unregister_hdlc_device(info->netdev);
1954         free_netdev(info->netdev);
1955         info->netdev = NULL;
1956 }
1957 
1958 #endif /* CONFIG_HDLC */
1959 
1960 
1961 /* Return next bottom half action to perform.
1962  * Return Value:        BH action code or 0 if nothing to do.
1963  */
1964 static int bh_action(SLMP_INFO *info)
1965 {
1966         unsigned long flags;
1967         int rc = 0;
1968 
1969         spin_lock_irqsave(&info->lock,flags);
1970 
1971         if (info->pending_bh & BH_RECEIVE) {
1972                 info->pending_bh &= ~BH_RECEIVE;
1973                 rc = BH_RECEIVE;
1974         } else if (info->pending_bh & BH_TRANSMIT) {
1975                 info->pending_bh &= ~BH_TRANSMIT;
1976                 rc = BH_TRANSMIT;
1977         } else if (info->pending_bh & BH_STATUS) {
1978                 info->pending_bh &= ~BH_STATUS;
1979                 rc = BH_STATUS;
1980         }
1981 
1982         if (!rc) {
1983                 /* Mark BH routine as complete */
1984                 info->bh_running = false;
1985                 info->bh_requested = false;
1986         }
1987 
1988         spin_unlock_irqrestore(&info->lock,flags);
1989 
1990         return rc;
1991 }
1992 
1993 /* Perform bottom half processing of work items queued by ISR.
1994  */
1995 static void bh_handler(struct work_struct *work)
1996 {
1997         SLMP_INFO *info = container_of(work, SLMP_INFO, task);
1998         int action;
1999 
2000         if ( debug_level >= DEBUG_LEVEL_BH )
2001                 printk( "%s(%d):%s bh_handler() entry\n",
2002                         __FILE__,__LINE__,info->device_name);
2003 
2004         info->bh_running = true;
2005 
2006         while((action = bh_action(info)) != 0) {
2007 
2008                 /* Process work item */
2009                 if ( debug_level >= DEBUG_LEVEL_BH )
2010                         printk( "%s(%d):%s bh_handler() work item action=%d\n",
2011                                 __FILE__,__LINE__,info->device_name, action);
2012 
2013                 switch (action) {
2014 
2015                 case BH_RECEIVE:
2016                         bh_receive(info);
2017                         break;
2018                 case BH_TRANSMIT:
2019                         bh_transmit(info);
2020                         break;
2021                 case BH_STATUS:
2022                         bh_status(info);
2023                         break;
2024                 default:
2025                         /* unknown work item ID */
2026                         printk("%s(%d):%s Unknown work item ID=%08X!\n",
2027                                 __FILE__,__LINE__,info->device_name,action);
2028                         break;
2029                 }
2030         }
2031 
2032         if ( debug_level >= DEBUG_LEVEL_BH )
2033                 printk( "%s(%d):%s bh_handler() exit\n",
2034                         __FILE__,__LINE__,info->device_name);
2035 }
2036 
2037 static void bh_receive(SLMP_INFO *info)
2038 {
2039         if ( debug_level >= DEBUG_LEVEL_BH )
2040                 printk( "%s(%d):%s bh_receive()\n",
2041                         __FILE__,__LINE__,info->device_name);
2042 
2043         while( rx_get_frame(info) );
2044 }
2045 
2046 static void bh_transmit(SLMP_INFO *info)
2047 {
2048         struct tty_struct *tty = info->port.tty;
2049 
2050         if ( debug_level >= DEBUG_LEVEL_BH )
2051                 printk( "%s(%d):%s bh_transmit() entry\n",
2052                         __FILE__,__LINE__,info->device_name);
2053 
2054         if (tty)
2055                 tty_wakeup(tty);
2056 }
2057 
2058 static void bh_status(SLMP_INFO *info)
2059 {
2060         if ( debug_level >= DEBUG_LEVEL_BH )
2061                 printk( "%s(%d):%s bh_status() entry\n",
2062                         __FILE__,__LINE__,info->device_name);
2063 
2064         info->ri_chkcount = 0;
2065         info->dsr_chkcount = 0;
2066         info->dcd_chkcount = 0;
2067         info->cts_chkcount = 0;
2068 }
2069 
2070 static void isr_timer(SLMP_INFO * info)
2071 {
2072         unsigned char timer = (info->port_num & 1) ? TIMER2 : TIMER0;
2073 
2074         /* IER2<7..4> = timer<3..0> interrupt enables (0=disabled) */
2075         write_reg(info, IER2, 0);
2076 
2077         /* TMCS, Timer Control/Status Register
2078          *
2079          * 07      CMF, Compare match flag (read only) 1=match
2080          * 06      ECMI, CMF Interrupt Enable: 0=disabled
2081          * 05      Reserved, must be 0
2082          * 04      TME, Timer Enable
2083          * 03..00  Reserved, must be 0
2084          *
2085          * 0000 0000
2086          */
2087         write_reg(info, (unsigned char)(timer + TMCS), 0);
2088 
2089         info->irq_occurred = true;
2090 
2091         if ( debug_level >= DEBUG_LEVEL_ISR )
2092                 printk("%s(%d):%s isr_timer()\n",
2093                         __FILE__,__LINE__,info->device_name);
2094 }
2095 
2096 static void isr_rxint(SLMP_INFO * info)
2097 {
2098         struct tty_struct *tty = info->port.tty;
2099         struct  mgsl_icount *icount = &info->icount;
2100         unsigned char status = read_reg(info, SR1) & info->ie1_value & (FLGD + IDLD + CDCD + BRKD);
2101         unsigned char status2 = read_reg(info, SR2) & info->ie2_value & OVRN;
2102 
2103         /* clear status bits */
2104         if (status)
2105                 write_reg(info, SR1, status);
2106 
2107         if (status2)
2108                 write_reg(info, SR2, status2);
2109         
2110         if ( debug_level >= DEBUG_LEVEL_ISR )
2111                 printk("%s(%d):%s isr_rxint status=%02X %02x\n",
2112                         __FILE__,__LINE__,info->device_name,status,status2);
2113 
2114         if (info->params.mode == MGSL_MODE_ASYNC) {
2115                 if (status & BRKD) {
2116                         icount->brk++;
2117 
2118                         /* process break detection if tty control
2119                          * is not set to ignore it
2120                          */
2121                         if (!(status & info->ignore_status_mask1)) {
2122                                 if (info->read_status_mask1 & BRKD) {
2123                                         tty_insert_flip_char(&info->port, 0, TTY_BREAK);
2124                                         if (tty && (info->port.flags & ASYNC_SAK))
2125                                                 do_SAK(tty);
2126                                 }
2127                         }
2128                 }
2129         }
2130         else {
2131                 if (status & (FLGD|IDLD)) {
2132                         if (status & FLGD)
2133                                 info->icount.exithunt++;
2134                         else if (status & IDLD)
2135                                 info->icount.rxidle++;
2136                         wake_up_interruptible(&info->event_wait_q);
2137                 }
2138         }
2139 
2140         if (status & CDCD) {
2141                 /* simulate a common modem status change interrupt
2142                  * for our handler
2143                  */
2144                 get_signals( info );
2145                 isr_io_pin(info,
2146                         MISCSTATUS_DCD_LATCHED|(info->serial_signals&SerialSignal_DCD));
2147         }
2148 }
2149 
2150 /*
2151  * handle async rx data interrupts
2152  */
2153 static void isr_rxrdy(SLMP_INFO * info)
2154 {
2155         u16 status;
2156         unsigned char DataByte;
2157         struct  mgsl_icount *icount = &info->icount;
2158 
2159         if ( debug_level >= DEBUG_LEVEL_ISR )
2160                 printk("%s(%d):%s isr_rxrdy\n",
2161                         __FILE__,__LINE__,info->device_name);
2162 
2163         while((status = read_reg(info,CST0)) & BIT0)
2164         {
2165                 int flag = 0;
2166                 bool over = false;
2167                 DataByte = read_reg(info,TRB);
2168 
2169                 icount->rx++;
2170 
2171                 if ( status & (PE + FRME + OVRN) ) {
2172                         printk("%s(%d):%s rxerr=%04X\n",
2173                                 __FILE__,__LINE__,info->device_name,status);
2174 
2175                         /* update error statistics */
2176                         if (status & PE)
2177                                 icount->parity++;
2178                         else if (status & FRME)
2179                                 icount->frame++;
2180                         else if (status & OVRN)
2181                                 icount->overrun++;
2182 
2183                         /* discard char if tty control flags say so */
2184                         if (status & info->ignore_status_mask2)
2185                                 continue;
2186 
2187                         status &= info->read_status_mask2;
2188 
2189                         if (status & PE)
2190                                 flag = TTY_PARITY;
2191                         else if (status & FRME)
2192                                 flag = TTY_FRAME;
2193                         if (status & OVRN) {
2194                                 /* Overrun is special, since it's
2195                                  * reported immediately, and doesn't
2196                                  * affect the current character
2197                                  */
2198                                 over = true;
2199                         }
2200                 }       /* end of if (error) */
2201 
2202                 tty_insert_flip_char(&info->port, DataByte, flag);
2203                 if (over)
2204                         tty_insert_flip_char(&info->port, 0, TTY_OVERRUN);
2205         }
2206 
2207         if ( debug_level >= DEBUG_LEVEL_ISR ) {
2208                 printk("%s(%d):%s rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
2209                         __FILE__,__LINE__,info->device_name,
2210                         icount->rx,icount->brk,icount->parity,
2211                         icount->frame,icount->overrun);
2212         }
2213 
2214         tty_flip_buffer_push(&info->port);
2215 }
2216 
2217 static void isr_txeom(SLMP_INFO * info, unsigned char status)
2218 {
2219         if ( debug_level >= DEBUG_LEVEL_ISR )
2220                 printk("%s(%d):%s isr_txeom status=%02x\n",
2221                         __FILE__,__LINE__,info->device_name,status);
2222 
2223         write_reg(info, TXDMA + DIR, 0x00); /* disable Tx DMA IRQs */
2224         write_reg(info, TXDMA + DSR, 0xc0); /* clear IRQs and disable DMA */
2225         write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
2226 
2227         if (status & UDRN) {
2228                 write_reg(info, CMD, TXRESET);
2229                 write_reg(info, CMD, TXENABLE);
2230         } else
2231                 write_reg(info, CMD, TXBUFCLR);
2232 
2233         /* disable and clear tx interrupts */
2234         info->ie0_value &= ~TXRDYE;
2235         info->ie1_value &= ~(IDLE + UDRN);
2236         write_reg16(info, IE0, (unsigned short)((info->ie1_value << 8) + info->ie0_value));
2237         write_reg(info, SR1, (unsigned char)(UDRN + IDLE));
2238 
2239         if ( info->tx_active ) {
2240                 if (info->params.mode != MGSL_MODE_ASYNC) {
2241                         if (status & UDRN)
2242                                 info->icount.txunder++;
2243                         else if (status & IDLE)
2244                                 info->icount.txok++;
2245                 }
2246 
2247                 info->tx_active = false;
2248                 info->tx_count = info->tx_put = info->tx_get = 0;
2249 
2250                 del_timer(&info->tx_timer);
2251 
2252                 if (info->params.mode != MGSL_MODE_ASYNC && info->drop_rts_on_tx_done ) {
2253                         info->serial_signals &= ~SerialSignal_RTS;
2254                         info->drop_rts_on_tx_done = false;
2255                         set_signals(info);
2256                 }
2257 
2258 #if SYNCLINK_GENERIC_HDLC
2259                 if (info->netcount)
2260                         hdlcdev_tx_done(info);
2261                 else
2262 #endif
2263                 {
2264                         if (info->port.tty && (info->port.tty->stopped || info->port.tty->hw_stopped)) {
2265                                 tx_stop(info);
2266                                 return;
2267                         }
2268                         info->pending_bh |= BH_TRANSMIT;
2269                 }
2270         }
2271 }
2272 
2273 
2274 /*
2275  * handle tx status interrupts
2276  */
2277 static void isr_txint(SLMP_INFO * info)
2278 {
2279         unsigned char status = read_reg(info, SR1) & info->ie1_value & (UDRN + IDLE + CCTS);
2280 
2281         /* clear status bits */
2282         write_reg(info, SR1, status);
2283 
2284         if ( debug_level >= DEBUG_LEVEL_ISR )
2285                 printk("%s(%d):%s isr_txint status=%02x\n",
2286                         __FILE__,__LINE__,info->device_name,status);
2287 
2288         if (status & (UDRN + IDLE))
2289                 isr_txeom(info, status);
2290 
2291         if (status & CCTS) {
2292                 /* simulate a common modem status change interrupt
2293                  * for our handler
2294                  */
2295                 get_signals( info );
2296                 isr_io_pin(info,
2297                         MISCSTATUS_CTS_LATCHED|(info->serial_signals&SerialSignal_CTS));
2298 
2299         }
2300 }
2301 
2302 /*
2303  * handle async tx data interrupts
2304  */
2305 static void isr_txrdy(SLMP_INFO * info)
2306 {
2307         if ( debug_level >= DEBUG_LEVEL_ISR )
2308                 printk("%s(%d):%s isr_txrdy() tx_count=%d\n",
2309                         __FILE__,__LINE__,info->device_name,info->tx_count);
2310 
2311         if (info->params.mode != MGSL_MODE_ASYNC) {
2312                 /* disable TXRDY IRQ, enable IDLE IRQ */
2313                 info->ie0_value &= ~TXRDYE;
2314                 info->ie1_value |= IDLE;
2315                 write_reg16(info, IE0, (unsigned short)((info->ie1_value << 8) + info->ie0_value));
2316                 return;
2317         }
2318 
2319         if (info->port.tty && (info->port.tty->stopped || info->port.tty->hw_stopped)) {
2320                 tx_stop(info);
2321                 return;
2322         }
2323 
2324         if ( info->tx_count )
2325                 tx_load_fifo( info );
2326         else {
2327                 info->tx_active = false;
2328                 info->ie0_value &= ~TXRDYE;
2329                 write_reg(info, IE0, info->ie0_value);
2330         }
2331 
2332         if (info->tx_count < WAKEUP_CHARS)
2333                 info->pending_bh |= BH_TRANSMIT;
2334 }
2335 
2336 static void isr_rxdmaok(SLMP_INFO * info)
2337 {
2338         /* BIT7 = EOT (end of transfer)
2339          * BIT6 = EOM (end of message/frame)
2340          */
2341         unsigned char status = read_reg(info,RXDMA + DSR) & 0xc0;
2342 
2343         /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2344         write_reg(info, RXDMA + DSR, (unsigned char)(status | 1));
2345 
2346         if ( debug_level >= DEBUG_LEVEL_ISR )
2347                 printk("%s(%d):%s isr_rxdmaok(), status=%02x\n",
2348                         __FILE__,__LINE__,info->device_name,status);
2349 
2350         info->pending_bh |= BH_RECEIVE;
2351 }
2352 
2353 static void isr_rxdmaerror(SLMP_INFO * info)
2354 {
2355         /* BIT5 = BOF (buffer overflow)
2356          * BIT4 = COF (counter overflow)
2357          */
2358         unsigned char status = read_reg(info,RXDMA + DSR) & 0x30;
2359 
2360         /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2361         write_reg(info, RXDMA + DSR, (unsigned char)(status | 1));
2362 
2363         if ( debug_level >= DEBUG_LEVEL_ISR )
2364                 printk("%s(%d):%s isr_rxdmaerror(), status=%02x\n",
2365                         __FILE__,__LINE__,info->device_name,status);
2366 
2367         info->rx_overflow = true;
2368         info->pending_bh |= BH_RECEIVE;
2369 }
2370 
2371 static void isr_txdmaok(SLMP_INFO * info)
2372 {
2373         unsigned char status_reg1 = read_reg(info, SR1);
2374 
2375         write_reg(info, TXDMA + DIR, 0x00);     /* disable Tx DMA IRQs */
2376         write_reg(info, TXDMA + DSR, 0xc0); /* clear IRQs and disable DMA */
2377         write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
2378 
2379         if ( debug_level >= DEBUG_LEVEL_ISR )
2380                 printk("%s(%d):%s isr_txdmaok(), status=%02x\n",
2381                         __FILE__,__LINE__,info->device_name,status_reg1);
2382 
2383         /* program TXRDY as FIFO empty flag, enable TXRDY IRQ */
2384         write_reg16(info, TRC0, 0);
2385         info->ie0_value |= TXRDYE;
2386         write_reg(info, IE0, info->ie0_value);
2387 }
2388 
2389 static void isr_txdmaerror(SLMP_INFO * info)
2390 {
2391         /* BIT5 = BOF (buffer overflow)
2392          * BIT4 = COF (counter overflow)
2393          */
2394         unsigned char status = read_reg(info,TXDMA + DSR) & 0x30;
2395 
2396         /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2397         write_reg(info, TXDMA + DSR, (unsigned char)(status | 1));
2398 
2399         if ( debug_level >= DEBUG_LEVEL_ISR )
2400                 printk("%s(%d):%s isr_txdmaerror(), status=%02x\n",
2401                         __FILE__,__LINE__,info->device_name,status);
2402 }
2403 
2404 /* handle input serial signal changes
2405  */
2406 static void isr_io_pin( SLMP_INFO *info, u16 status )
2407 {
2408         struct  mgsl_icount *icount;
2409 
2410         if ( debug_level >= DEBUG_LEVEL_ISR )
2411                 printk("%s(%d):isr_io_pin status=%04X\n",
2412                         __FILE__,__LINE__,status);
2413 
2414         if (status & (MISCSTATUS_CTS_LATCHED | MISCSTATUS_DCD_LATCHED |
2415                       MISCSTATUS_DSR_LATCHED | MISCSTATUS_RI_LATCHED) ) {
2416                 icount = &info->icount;
2417                 /* update input line counters */
2418                 if (status & MISCSTATUS_RI_LATCHED) {
2419                         icount->rng++;
2420                         if ( status & SerialSignal_RI )
2421                                 info->input_signal_events.ri_up++;
2422                         else
2423                                 info->input_signal_events.ri_down++;
2424                 }
2425                 if (status & MISCSTATUS_DSR_LATCHED) {
2426                         icount->dsr++;
2427                         if ( status & SerialSignal_DSR )
2428                                 info->input_signal_events.dsr_up++;
2429                         else
2430                                 info->input_signal_events.dsr_down++;
2431                 }
2432                 if (status & MISCSTATUS_DCD_LATCHED) {
2433                         if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT) {
2434                                 info->ie1_value &= ~CDCD;
2435                                 write_reg(info, IE1, info->ie1_value);
2436                         }
2437                         icount->dcd++;
2438                         if (status & SerialSignal_DCD) {
2439                                 info->input_signal_events.dcd_up++;
2440                         } else
2441                                 info->input_signal_events.dcd_down++;
2442 #if SYNCLINK_GENERIC_HDLC
2443                         if (info->netcount) {
2444                                 if (status & SerialSignal_DCD)
2445                                         netif_carrier_on(info->netdev);
2446                                 else
2447                                         netif_carrier_off(info->netdev);
2448                         }
2449 #endif
2450                 }
2451                 if (status & MISCSTATUS_CTS_LATCHED)
2452                 {
2453                         if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT) {
2454                                 info->ie1_value &= ~CCTS;
2455                                 write_reg(info, IE1, info->ie1_value);
2456                         }
2457                         icount->cts++;
2458                         if ( status & SerialSignal_CTS )
2459                                 info->input_signal_events.cts_up++;
2460                         else
2461                                 info->input_signal_events.cts_down++;
2462                 }
2463                 wake_up_interruptible(&info->status_event_wait_q);
2464                 wake_up_interruptible(&info->event_wait_q);
2465 
2466                 if ( (info->port.flags & ASYNC_CHECK_CD) &&
2467                      (status & MISCSTATUS_DCD_LATCHED) ) {
2468                         if ( debug_level >= DEBUG_LEVEL_ISR )
2469                                 printk("%s CD now %s...", info->device_name,
2470                                        (status & SerialSignal_DCD) ? "on" : "off");
2471                         if (status & SerialSignal_DCD)
2472                                 wake_up_interruptible(&info->port.open_wait);
2473                         else {
2474                                 if ( debug_level >= DEBUG_LEVEL_ISR )
2475                                         printk("doing serial hangup...");
2476                                 if (info->port.tty)
2477                                         tty_hangup(info->port.tty);
2478                         }
2479                 }
2480 
2481                 if (tty_port_cts_enabled(&info->port) &&
2482                      (status & MISCSTATUS_CTS_LATCHED) ) {
2483                         if ( info->port.tty ) {
2484                                 if (info->port.tty->hw_stopped) {
2485                                         if (status & SerialSignal_CTS) {
2486                                                 if ( debug_level >= DEBUG_LEVEL_ISR )
2487                                                         printk("CTS tx start...");
2488                                                 info->port.tty->hw_stopped = 0;
2489                                                 tx_start(info);
2490                                                 info->pending_bh |= BH_TRANSMIT;
2491                                                 return;
2492                                         }
2493                                 } else {
2494                                         if (!(status & SerialSignal_CTS)) {
2495                                                 if ( debug_level >= DEBUG_LEVEL_ISR )
2496                                                         printk("CTS tx stop...");
2497                                                 info->port.tty->hw_stopped = 1;
2498                                                 tx_stop(info);
2499                                         }
2500                                 }
2501                         }
2502                 }
2503         }
2504 
2505         info->pending_bh |= BH_STATUS;
2506 }
2507 
2508 /* Interrupt service routine entry point.
2509  *
2510  * Arguments:
2511  *      irq             interrupt number that caused interrupt
2512  *      dev_id          device ID supplied during interrupt registration
2513  *      regs            interrupted processor context
2514  */
2515 static irqreturn_t synclinkmp_interrupt(int dummy, void *dev_id)
2516 {
2517         SLMP_INFO *info = dev_id;
2518         unsigned char status, status0, status1=0;
2519         unsigned char dmastatus, dmastatus0, dmastatus1=0;
2520         unsigned char timerstatus0, timerstatus1=0;
2521         unsigned char shift;
2522         unsigned int i;
2523         unsigned short tmp;
2524 
2525         if ( debug_level >= DEBUG_LEVEL_ISR )
2526                 printk(KERN_DEBUG "%s(%d): synclinkmp_interrupt(%d)entry.\n",
2527                         __FILE__, __LINE__, info->irq_level);
2528 
2529         spin_lock(&info->lock);
2530 
2531         for(;;) {
2532 
2533                 /* get status for SCA0 (ports 0-1) */
2534                 tmp = read_reg16(info, ISR0);   /* get ISR0 and ISR1 in one read */
2535                 status0 = (unsigned char)tmp;
2536                 dmastatus0 = (unsigned char)(tmp>>8);
2537                 timerstatus0 = read_reg(info, ISR2);
2538 
2539                 if ( debug_level >= DEBUG_LEVEL_ISR )
2540                         printk(KERN_DEBUG "%s(%d):%s status0=%02x, dmastatus0=%02x, timerstatus0=%02x\n",
2541                                 __FILE__, __LINE__, info->device_name,
2542                                 status0, dmastatus0, timerstatus0);
2543 
2544                 if (info->port_count == 4) {
2545                         /* get status for SCA1 (ports 2-3) */
2546                         tmp = read_reg16(info->port_array[2], ISR0);
2547                         status1 = (unsigned char)tmp;
2548                         dmastatus1 = (unsigned char)(tmp>>8);
2549                         timerstatus1 = read_reg(info->port_array[2], ISR2);
2550 
2551                         if ( debug_level >= DEBUG_LEVEL_ISR )
2552                                 printk("%s(%d):%s status1=%02x, dmastatus1=%02x, timerstatus1=%02x\n",
2553                                         __FILE__,__LINE__,info->device_name,
2554                                         status1,dmastatus1,timerstatus1);
2555                 }
2556 
2557                 if (!status0 && !dmastatus0 && !timerstatus0 &&
2558                          !status1 && !dmastatus1 && !timerstatus1)
2559                         break;
2560 
2561                 for(i=0; i < info->port_count ; i++) {
2562                         if (info->port_array[i] == NULL)
2563                                 continue;
2564                         if (i < 2) {
2565                                 status = status0;
2566                                 dmastatus = dmastatus0;
2567                         } else {
2568                                 status = status1;
2569                                 dmastatus = dmastatus1;
2570                         }
2571 
2572                         shift = i & 1 ? 4 :0;
2573 
2574                         if (status & BIT0 << shift)
2575                                 isr_rxrdy(info->port_array[i]);
2576                         if (status & BIT1 << shift)
2577                                 isr_txrdy(info->port_array[i]);
2578                         if (status & BIT2 << shift)
2579                                 isr_rxint(info->port_array[i]);
2580                         if (status & BIT3 << shift)
2581                                 isr_txint(info->port_array[i]);
2582 
2583                         if (dmastatus & BIT0 << shift)
2584                                 isr_rxdmaerror(info->port_array[i]);
2585                         if (dmastatus & BIT1 << shift)
2586                                 isr_rxdmaok(info->port_array[i]);
2587                         if (dmastatus & BIT2 << shift)
2588                                 isr_txdmaerror(info->port_array[i]);
2589                         if (dmastatus & BIT3 << shift)
2590                                 isr_txdmaok(info->port_array[i]);
2591                 }
2592 
2593                 if (timerstatus0 & (BIT5 | BIT4))
2594                         isr_timer(info->port_array[0]);
2595                 if (timerstatus0 & (BIT7 | BIT6))
2596                         isr_timer(info->port_array[1]);
2597                 if (timerstatus1 & (BIT5 | BIT4))
2598                         isr_timer(info->port_array[2]);
2599                 if (timerstatus1 & (BIT7 | BIT6))
2600                         isr_timer(info->port_array[3]);
2601         }
2602 
2603         for(i=0; i < info->port_count ; i++) {
2604                 SLMP_INFO * port = info->port_array[i];
2605 
2606                 /* Request bottom half processing if there's something
2607                  * for it to do and the bh is not already running.
2608                  *
2609                  * Note: startup adapter diags require interrupts.
2610                  * do not request bottom half processing if the
2611                  * device is not open in a normal mode.
2612                  */
2613                 if ( port && (port->port.count || port->netcount) &&
2614                      port->pending_bh && !port->bh_running &&
2615                      !port->bh_requested ) {
2616                         if ( debug_level >= DEBUG_LEVEL_ISR )
2617                                 printk("%s(%d):%s queueing bh task.\n",
2618                                         __FILE__,__LINE__,port->device_name);
2619                         schedule_work(&port->task);
2620                         port->bh_requested = true;
2621                 }
2622         }
2623 
2624         spin_unlock(&info->lock);
2625 
2626         if ( debug_level >= DEBUG_LEVEL_ISR )
2627                 printk(KERN_DEBUG "%s(%d):synclinkmp_interrupt(%d)exit.\n",
2628                         __FILE__, __LINE__, info->irq_level);
2629         return IRQ_HANDLED;
2630 }
2631 
2632 /* Initialize and start device.
2633  */
2634 static int startup(SLMP_INFO * info)
2635 {
2636         if ( debug_level >= DEBUG_LEVEL_INFO )
2637                 printk("%s(%d):%s tx_releaseup()\n",__FILE__,__LINE__,info->device_name);
2638 
2639         if (info->port.flags & ASYNC_INITIALIZED)
2640                 return 0;
2641 
2642         if (!info->tx_buf) {
2643                 info->tx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
2644                 if (!info->tx_buf) {
2645                         printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
2646                                 __FILE__,__LINE__,info->device_name);
2647                         return -ENOMEM;
2648                 }
2649         }
2650 
2651         info->pending_bh = 0;
2652 
2653         memset(&info->icount, 0, sizeof(info->icount));
2654 
2655         /* program hardware for current parameters */
2656         reset_port(info);
2657 
2658         change_params(info);
2659 
2660         mod_timer(&info->status_timer, jiffies + msecs_to_jiffies(10));
2661 
2662         if (info->port.tty)
2663                 clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
2664 
2665         info->port.flags |= ASYNC_INITIALIZED;
2666 
2667         return 0;
2668 }
2669 
2670 /* Called by close() and hangup() to shutdown hardware
2671  */
2672 static void shutdown(SLMP_INFO * info)
2673 {
2674         unsigned long flags;
2675 
2676         if (!(info->port.flags & ASYNC_INITIALIZED))
2677                 return;
2678 
2679         if (debug_level >= DEBUG_LEVEL_INFO)
2680                 printk("%s(%d):%s synclinkmp_shutdown()\n",
2681                          __FILE__,__LINE__, info->device_name );
2682 
2683         /* clear status wait queue because status changes */
2684         /* can't happen after shutting down the hardware */
2685         wake_up_interruptible(&info->status_event_wait_q);
2686         wake_up_interruptible(&info->event_wait_q);
2687 
2688         del_timer(&info->tx_timer);
2689         del_timer(&info->status_timer);
2690 
2691         kfree(info->tx_buf);
2692         info->tx_buf = NULL;
2693 
2694         spin_lock_irqsave(&info->lock,flags);
2695 
2696         reset_port(info);
2697 
2698         if (!info->port.tty || info->port.tty->termios.c_cflag & HUPCL) {
2699                 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
2700                 set_signals(info);
2701         }
2702 
2703         spin_unlock_irqrestore(&info->lock,flags);
2704 
2705         if (info->port.tty)
2706                 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
2707 
2708         info->port.flags &= ~ASYNC_INITIALIZED;
2709 }
2710 
2711 static void program_hw(SLMP_INFO *info)
2712 {
2713         unsigned long flags;
2714 
2715         spin_lock_irqsave(&info->lock,flags);
2716 
2717         rx_stop(info);
2718         tx_stop(info);
2719 
2720         info->tx_count = info->tx_put = info->tx_get = 0;
2721 
2722         if (info->params.mode == MGSL_MODE_HDLC || info->netcount)
2723                 hdlc_mode(info);
2724         else
2725                 async_mode(info);
2726 
2727         set_signals(info);
2728 
2729         info->dcd_chkcount = 0;
2730         info->cts_chkcount = 0;
2731         info->ri_chkcount = 0;
2732         info->dsr_chkcount = 0;
2733 
2734         info->ie1_value |= (CDCD|CCTS);
2735         write_reg(info, IE1, info->ie1_value);
2736 
2737         get_signals(info);
2738 
2739         if (info->netcount || (info->port.tty && info->port.tty->termios.c_cflag & CREAD) )
2740                 rx_start(info);
2741 
2742         spin_unlock_irqrestore(&info->lock,flags);
2743 }
2744 
2745 /* Reconfigure adapter based on new parameters
2746  */
2747 static void change_params(SLMP_INFO *info)
2748 {
2749         unsigned cflag;
2750         int bits_per_char;
2751 
2752         if (!info->port.tty)
2753                 return;
2754 
2755         if (debug_level >= DEBUG_LEVEL_INFO)
2756                 printk("%s(%d):%s change_params()\n",
2757                          __FILE__,__LINE__, info->device_name );
2758 
2759         cflag = info->port.tty->termios.c_cflag;
2760 
2761         /* if B0 rate (hangup) specified then negate RTS and DTR */
2762         /* otherwise assert RTS and DTR */
2763         if (cflag & CBAUD)
2764                 info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR;
2765         else
2766                 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
2767 
2768         /* byte size and parity */
2769 
2770         switch (cflag & CSIZE) {
2771               case CS5: info->params.data_bits = 5; break;
2772               case CS6: info->params.data_bits = 6; break;
2773               case CS7: info->params.data_bits = 7; break;
2774               case CS8: info->params.data_bits = 8; break;
2775               /* Never happens, but GCC is too dumb to figure it out */
2776               default:  info->params.data_bits = 7; break;
2777               }
2778 
2779         if (cflag & CSTOPB)
2780                 info->params.stop_bits = 2;
2781         else
2782                 info->params.stop_bits = 1;
2783 
2784         info->params.parity = ASYNC_PARITY_NONE;
2785         if (cflag & PARENB) {
2786                 if (cflag & PARODD)
2787                         info->params.parity = ASYNC_PARITY_ODD;
2788                 else
2789                         info->params.parity = ASYNC_PARITY_EVEN;
2790 #ifdef CMSPAR
2791                 if (cflag & CMSPAR)
2792                         info->params.parity = ASYNC_PARITY_SPACE;
2793 #endif
2794         }
2795 
2796         /* calculate number of jiffies to transmit a full
2797          * FIFO (32 bytes) at specified data rate
2798          */
2799         bits_per_char = info->params.data_bits +
2800                         info->params.stop_bits + 1;
2801 
2802         /* if port data rate is set to 460800 or less then
2803          * allow tty settings to override, otherwise keep the
2804          * current data rate.
2805          */
2806         if (info->params.data_rate <= 460800) {
2807                 info->params.data_rate = tty_get_baud_rate(info->port.tty);
2808         }
2809 
2810         if ( info->params.data_rate ) {
2811                 info->timeout = (32*HZ*bits_per_char) /
2812                                 info->params.data_rate;
2813         }
2814         info->timeout += HZ/50;         /* Add .02 seconds of slop */
2815 
2816         if (cflag & CRTSCTS)
2817                 info->port.flags |= ASYNC_CTS_FLOW;
2818         else
2819                 info->port.flags &= ~ASYNC_CTS_FLOW;
2820 
2821         if (cflag & CLOCAL)
2822                 info->port.flags &= ~ASYNC_CHECK_CD;
2823         else
2824                 info->port.flags |= ASYNC_CHECK_CD;
2825 
2826         /* process tty input control flags */
2827 
2828         info->read_status_mask2 = OVRN;
2829         if (I_INPCK(info->port.tty))
2830                 info->read_status_mask2 |= PE | FRME;
2831         if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty))
2832                 info->read_status_mask1 |= BRKD;
2833         if (I_IGNPAR(info->port.tty))
2834                 info->ignore_status_mask2 |= PE | FRME;
2835         if (I_IGNBRK(info->port.tty)) {
2836                 info->ignore_status_mask1 |= BRKD;
2837                 /* If ignoring parity and break indicators, ignore
2838                  * overruns too.  (For real raw support).
2839                  */
2840                 if (I_IGNPAR(info->port.tty))
2841                         info->ignore_status_mask2 |= OVRN;
2842         }
2843 
2844         program_hw(info);
2845 }
2846 
2847 static int get_stats(SLMP_INFO * info, struct mgsl_icount __user *user_icount)
2848 {
2849         int err;
2850 
2851         if (debug_level >= DEBUG_LEVEL_INFO)
2852                 printk("%s(%d):%s get_params()\n",
2853                          __FILE__,__LINE__, info->device_name);
2854 
2855         if (!user_icount) {
2856                 memset(&info->icount, 0, sizeof(info->icount));
2857         } else {
2858                 mutex_lock(&info->port.mutex);
2859                 COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
2860                 mutex_unlock(&info->port.mutex);
2861                 if (err)
2862                         return -EFAULT;
2863         }
2864 
2865         return 0;
2866 }
2867 
2868 static int get_params(SLMP_INFO * info, MGSL_PARAMS __user *user_params)
2869 {
2870         int err;
2871         if (debug_level >= DEBUG_LEVEL_INFO)
2872                 printk("%s(%d):%s get_params()\n",
2873                          __FILE__,__LINE__, info->device_name);
2874 
2875         mutex_lock(&info->port.mutex);
2876         COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
2877         mutex_unlock(&info->port.mutex);
2878         if (err) {
2879                 if ( debug_level >= DEBUG_LEVEL_INFO )
2880                         printk( "%s(%d):%s get_params() user buffer copy failed\n",
2881                                 __FILE__,__LINE__,info->device_name);
2882                 return -EFAULT;
2883         }
2884 
2885         return 0;
2886 }
2887 
2888 static int set_params(SLMP_INFO * info, MGSL_PARAMS __user *new_params)
2889 {
2890         unsigned long flags;
2891         MGSL_PARAMS tmp_params;
2892         int err;
2893 
2894         if (debug_level >= DEBUG_LEVEL_INFO)
2895                 printk("%s(%d):%s set_params\n",
2896                         __FILE__,__LINE__,info->device_name );
2897         COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
2898         if (err) {
2899                 if ( debug_level >= DEBUG_LEVEL_INFO )
2900                         printk( "%s(%d):%s set_params() user buffer copy failed\n",
2901                                 __FILE__,__LINE__,info->device_name);
2902                 return -EFAULT;
2903         }
2904 
2905         mutex_lock(&info->port.mutex);
2906         spin_lock_irqsave(&info->lock,flags);
2907         memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
2908         spin_unlock_irqrestore(&info->lock,flags);
2909 
2910         change_params(info);
2911         mutex_unlock(&info->port.mutex);
2912 
2913         return 0;
2914 }
2915 
2916 static int get_txidle(SLMP_INFO * info, int __user *idle_mode)
2917 {
2918         int err;
2919 
2920         if (debug_level >= DEBUG_LEVEL_INFO)
2921                 printk("%s(%d):%s get_txidle()=%d\n",
2922                          __FILE__,__LINE__, info->device_name, info->idle_mode);
2923 
2924         COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
2925         if (err) {
2926                 if ( debug_level >= DEBUG_LEVEL_INFO )
2927                         printk( "%s(%d):%s get_txidle() user buffer copy failed\n",
2928                                 __FILE__,__LINE__,info->device_name);
2929                 return -EFAULT;
2930         }
2931 
2932         return 0;
2933 }
2934 
2935 static int set_txidle(SLMP_INFO * info, int idle_mode)
2936 {
2937         unsigned long flags;
2938 
2939         if (debug_level >= DEBUG_LEVEL_INFO)
2940                 printk("%s(%d):%s set_txidle(%d)\n",
2941                         __FILE__,__LINE__,info->device_name, idle_mode );
2942 
2943         spin_lock_irqsave(&info->lock,flags);
2944         info->idle_mode = idle_mode;
2945         tx_set_idle( info );
2946         spin_unlock_irqrestore(&info->lock,flags);
2947         return 0;
2948 }
2949 
2950 static int tx_enable(SLMP_INFO * info, int enable)
2951 {
2952         unsigned long flags;
2953 
2954         if (debug_level >= DEBUG_LEVEL_INFO)
2955                 printk("%s(%d):%s tx_enable(%d)\n",
2956                         __FILE__,__LINE__,info->device_name, enable);
2957 
2958         spin_lock_irqsave(&info->lock,flags);
2959         if ( enable ) {
2960                 if ( !info->tx_enabled ) {
2961                         tx_start(info);
2962                 }
2963         } else {
2964                 if ( info->tx_enabled )
2965                         tx_stop(info);
2966         }
2967         spin_unlock_irqrestore(&info->lock,flags);
2968         return 0;
2969 }
2970 
2971 /* abort send HDLC frame
2972  */
2973 static int tx_abort(SLMP_INFO * info)
2974 {
2975         unsigned long flags;
2976 
2977         if (debug_level >= DEBUG_LEVEL_INFO)
2978                 printk("%s(%d):%s tx_abort()\n",
2979                         __FILE__,__LINE__,info->device_name);
2980 
2981         spin_lock_irqsave(&info->lock,flags);
2982         if ( info->tx_active && info->params.mode == MGSL_MODE_HDLC ) {
2983                 info->ie1_value &= ~UDRN;
2984                 info->ie1_value |= IDLE;
2985                 write_reg(info, IE1, info->ie1_value);  /* disable tx status interrupts */
2986                 write_reg(info, SR1, (unsigned char)(IDLE + UDRN));     /* clear pending */
2987 
2988                 write_reg(info, TXDMA + DSR, 0);                /* disable DMA channel */
2989                 write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
2990 
2991                 write_reg(info, CMD, TXABORT);
2992         }
2993         spin_unlock_irqrestore(&info->lock,flags);
2994         return 0;
2995 }
2996 
2997 static int rx_enable(SLMP_INFO * info, int enable)
2998 {
2999         unsigned long flags;
3000 
3001         if (debug_level >= DEBUG_LEVEL_INFO)
3002                 printk("%s(%d):%s rx_enable(%d)\n",
3003                         __FILE__,__LINE__,info->device_name,enable);
3004 
3005         spin_lock_irqsave(&info->lock,flags);
3006         if ( enable ) {
3007                 if ( !info->rx_enabled )
3008                         rx_start(info);
3009         } else {
3010                 if ( info->rx_enabled )
3011                         rx_stop(info);
3012         }
3013         spin_unlock_irqrestore(&info->lock,flags);
3014         return 0;
3015 }
3016 
3017 /* wait for specified event to occur
3018  */
3019 static int wait_mgsl_event(SLMP_INFO * info, int __user *mask_ptr)
3020 {
3021         unsigned long flags;
3022         int s;
3023         int rc=0;
3024         struct mgsl_icount cprev, cnow;
3025         int events;
3026         int mask;
3027         struct  _input_signal_events oldsigs, newsigs;
3028         DECLARE_WAITQUEUE(wait, current);
3029 
3030         COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
3031         if (rc) {
3032                 return  -EFAULT;
3033         }
3034 
3035         if (debug_level >= DEBUG_LEVEL_INFO)
3036                 printk("%s(%d):%s wait_mgsl_event(%d)\n",
3037                         __FILE__,__LINE__,info->device_name,mask);
3038 
3039         spin_lock_irqsave(&info->lock,flags);
3040 
3041         /* return immediately if state matches requested events */
3042         get_signals(info);
3043         s = info->serial_signals;
3044 
3045         events = mask &
3046                 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
3047                   ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
3048                   ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
3049                   ((s & SerialSignal_RI)  ? MgslEvent_RiActive :MgslEvent_RiInactive) );
3050         if (events) {
3051                 spin_unlock_irqrestore(&info->lock,flags);
3052                 goto exit;
3053         }
3054 
3055         /* save current irq counts */
3056         cprev = info->icount;
3057         oldsigs = info->input_signal_events;
3058 
3059         /* enable hunt and idle irqs if needed */
3060         if (mask & (MgslEvent_ExitHuntMode+MgslEvent_IdleReceived)) {
3061                 unsigned char oldval = info->ie1_value;
3062                 unsigned char newval = oldval +
3063                          (mask & MgslEvent_ExitHuntMode ? FLGD:0) +
3064                          (mask & MgslEvent_IdleReceived ? IDLD:0);
3065                 if ( oldval != newval ) {
3066                         info->ie1_value = newval;
3067                         write_reg(info, IE1, info->ie1_value);
3068                 }
3069         }
3070 
3071         set_current_state(TASK_INTERRUPTIBLE);
3072         add_wait_queue(&info->event_wait_q, &wait);
3073 
3074         spin_unlock_irqrestore(&info->lock,flags);
3075 
3076         for(;;) {
3077                 schedule();
3078                 if (signal_pending(current)) {
3079                         rc = -ERESTARTSYS;
3080                         break;
3081                 }
3082 
3083                 /* get current irq counts */
3084                 spin_lock_irqsave(&info->lock,flags);
3085                 cnow = info->icount;
3086                 newsigs = info->input_signal_events;
3087                 set_current_state(TASK_INTERRUPTIBLE);
3088                 spin_unlock_irqrestore(&info->lock,flags);
3089 
3090                 /* if no change, wait aborted for some reason */
3091                 if (newsigs.dsr_up   == oldsigs.dsr_up   &&
3092                     newsigs.dsr_down == oldsigs.dsr_down &&
3093                     newsigs.dcd_up   == oldsigs.dcd_up   &&
3094                     newsigs.dcd_down == oldsigs.dcd_down &&
3095                     newsigs.cts_up   == oldsigs.cts_up   &&
3096                     newsigs.cts_down == oldsigs.cts_down &&
3097                     newsigs.ri_up    == oldsigs.ri_up    &&
3098                     newsigs.ri_down  == oldsigs.ri_down  &&
3099                     cnow.exithunt    == cprev.exithunt   &&
3100                     cnow.rxidle      == cprev.rxidle) {
3101                         rc = -EIO;
3102                         break;
3103                 }
3104 
3105                 events = mask &
3106                         ( (newsigs.dsr_up   != oldsigs.dsr_up   ? MgslEvent_DsrActive:0)   +
3107                           (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
3108                           (newsigs.dcd_up   != oldsigs.dcd_up   ? MgslEvent_DcdActive:0)   +
3109                           (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
3110                           (newsigs.cts_up   != oldsigs.cts_up   ? MgslEvent_CtsActive:0)   +
3111                           (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
3112                           (newsigs.ri_up    != oldsigs.ri_up    ? MgslEvent_RiActive:0)    +
3113                           (newsigs.ri_down  != oldsigs.ri_down  ? MgslEvent_RiInactive:0)  +
3114                           (cnow.exithunt    != cprev.exithunt   ? MgslEvent_ExitHuntMode:0) +
3115                           (cnow.rxidle      != cprev.rxidle     ? MgslEvent_IdleReceived:0) );
3116                 if (events)
3117                         break;
3118 
3119                 cprev = cnow;
3120                 oldsigs = newsigs;
3121         }
3122 
3123         remove_wait_queue(&info->event_wait_q, &wait);
3124         set_current_state(TASK_RUNNING);
3125 
3126 
3127         if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
3128                 spin_lock_irqsave(&info->lock,flags);
3129                 if (!waitqueue_active(&info->event_wait_q)) {
3130                         /* disable enable exit hunt mode/idle rcvd IRQs */
3131                         info->ie1_value &= ~(FLGD|IDLD);
3132                         write_reg(info, IE1, info->ie1_value);
3133                 }
3134                 spin_unlock_irqrestore(&info->lock,flags);
3135         }
3136 exit:
3137         if ( rc == 0 )
3138                 PUT_USER(rc, events, mask_ptr);
3139 
3140         return rc;
3141 }
3142 
3143 static int modem_input_wait(SLMP_INFO *info,int arg)
3144 {
3145         unsigned long flags;
3146         int rc;
3147         struct mgsl_icount cprev, cnow;
3148         DECLARE_WAITQUEUE(wait, current);
3149 
3150         /* save current irq counts */
3151         spin_lock_irqsave(&info->lock,flags);
3152         cprev = info->icount;
3153         add_wait_queue(&info->status_event_wait_q, &wait);
3154         set_current_state(TASK_INTERRUPTIBLE);
3155         spin_unlock_irqrestore(&info->lock,flags);
3156 
3157         for(;;) {
3158                 schedule();
3159                 if (signal_pending(current)) {
3160                         rc = -ERESTARTSYS;
3161                         break;
3162                 }
3163 
3164                 /* get new irq counts */
3165                 spin_lock_irqsave(&info->lock,flags);
3166                 cnow = info->icount;
3167                 set_current_state(TASK_INTERRUPTIBLE);
3168                 spin_unlock_irqrestore(&info->lock,flags);
3169 
3170                 /* if no change, wait aborted for some reason */
3171                 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
3172                     cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
3173                         rc = -EIO;
3174                         break;
3175                 }
3176 
3177                 /* check for change in caller specified modem input */
3178                 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
3179                     (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
3180                     (arg & TIOCM_CD  && cnow.dcd != cprev.dcd) ||
3181                     (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
3182                         rc = 0;
3183                         break;
3184                 }
3185 
3186                 cprev = cnow;
3187         }
3188         remove_wait_queue(&info->status_event_wait_q, &wait);
3189         set_current_state(TASK_RUNNING);
3190         return rc;
3191 }
3192 
3193 /* return the state of the serial control and status signals
3194  */
3195 static int tiocmget(struct tty_struct *tty)
3196 {
3197         SLMP_INFO *info = tty->driver_data;
3198         unsigned int result;
3199         unsigned long flags;
3200 
3201         spin_lock_irqsave(&info->lock,flags);
3202         get_signals(info);
3203         spin_unlock_irqrestore(&info->lock,flags);
3204 
3205         result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS : 0) |
3206                  ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR : 0) |
3207                  ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR : 0) |
3208                  ((info->serial_signals & SerialSignal_RI)  ? TIOCM_RNG : 0) |
3209                  ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR : 0) |
3210                  ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS : 0);
3211 
3212         if (debug_level >= DEBUG_LEVEL_INFO)
3213                 printk("%s(%d):%s tiocmget() value=%08X\n",
3214                          __FILE__,__LINE__, info->device_name, result );
3215         return result;
3216 }
3217 
3218 /* set modem control signals (DTR/RTS)
3219  */
3220 static int tiocmset(struct tty_struct *tty,
3221                                         unsigned int set, unsigned int clear)
3222 {
3223         SLMP_INFO *info = tty->driver_data;
3224         unsigned long flags;
3225 
3226         if (debug_level >= DEBUG_LEVEL_INFO)
3227                 printk("%s(%d):%s tiocmset(%x,%x)\n",
3228                         __FILE__,__LINE__,info->device_name, set, clear);
3229 
3230         if (set & TIOCM_RTS)
3231                 info->serial_signals |= SerialSignal_RTS;
3232         if (set & TIOCM_DTR)
3233                 info->serial_signals |= SerialSignal_DTR;
3234         if (clear & TIOCM_RTS)
3235                 info->serial_signals &= ~SerialSignal_RTS;
3236         if (clear & TIOCM_DTR)
3237                 info->serial_signals &= ~SerialSignal_DTR;
3238 
3239         spin_lock_irqsave(&info->lock,flags);
3240         set_signals(info);
3241         spin_unlock_irqrestore(&info->lock,flags);
3242 
3243         return 0;
3244 }
3245 
3246 static int carrier_raised(struct tty_port *port)
3247 {
3248         SLMP_INFO *info = container_of(port, SLMP_INFO, port);
3249         unsigned long flags;
3250 
3251         spin_lock_irqsave(&info->lock,flags);
3252         get_signals(info);
3253         spin_unlock_irqrestore(&info->lock,flags);
3254 
3255         return (info->serial_signals & SerialSignal_DCD) ? 1 : 0;
3256 }
3257 
3258 static void dtr_rts(struct tty_port *port, int on)
3259 {
3260         SLMP_INFO *info = container_of(port, SLMP_INFO, port);
3261         unsigned long flags;
3262 
3263         spin_lock_irqsave(&info->lock,flags);
3264         if (on)
3265                 info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR;
3266         else
3267                 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
3268         set_signals(info);
3269         spin_unlock_irqrestore(&info->lock,flags);
3270 }
3271 
3272 /* Block the current process until the specified port is ready to open.
3273  */
3274 static int block_til_ready(struct tty_struct *tty, struct file *filp,
3275                            SLMP_INFO *info)
3276 {
3277         DECLARE_WAITQUEUE(wait, current);
3278         int             retval;
3279         bool            do_clocal = false;
3280         unsigned long   flags;
3281         int             cd;
3282         struct tty_port *port = &info->port;
3283 
3284         if (debug_level >= DEBUG_LEVEL_INFO)
3285                 printk("%s(%d):%s block_til_ready()\n",
3286                          __FILE__,__LINE__, tty->driver->name );
3287 
3288         if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
3289                 /* nonblock mode is set or port is not enabled */
3290                 /* just verify that callout device is not active */
3291                 port->flags |= ASYNC_NORMAL_ACTIVE;
3292                 return 0;
3293         }
3294 
3295         if (C_CLOCAL(tty))
3296                 do_clocal = true;
3297 
3298         /* Wait for carrier detect and the line to become
3299          * free (i.e., not in use by the callout).  While we are in
3300          * this loop, port->count is dropped by one, so that
3301          * close() knows when to free things.  We restore it upon
3302          * exit, either normal or abnormal.
3303          */
3304 
3305         retval = 0;
3306         add_wait_queue(&port->open_wait, &wait);
3307 
3308         if (debug_level >= DEBUG_LEVEL_INFO)
3309                 printk("%s(%d):%s block_til_ready() before block, count=%d\n",
3310                          __FILE__,__LINE__, tty->driver->name, port->count );
3311 
3312         spin_lock_irqsave(&info->lock, flags);
3313         port->count--;
3314         spin_unlock_irqrestore(&info->lock, flags);
3315         port->blocked_open++;
3316 
3317         while (1) {
3318                 if (C_BAUD(tty) && test_bit(ASYNCB_INITIALIZED, &port->flags))
3319                         tty_port_raise_dtr_rts(port);
3320 
3321                 set_current_state(TASK_INTERRUPTIBLE);
3322 
3323                 if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)){
3324                         retval = (port->flags & ASYNC_HUP_NOTIFY) ?
3325                                         -EAGAIN : -ERESTARTSYS;
3326                         break;
3327                 }
3328 
3329                 cd = tty_port_carrier_raised(port);
3330                 if (do_clocal || cd)
3331                         break;
3332 
3333                 if (signal_pending(current)) {
3334                         retval = -ERESTARTSYS;
3335                         break;
3336                 }
3337 
3338                 if (debug_level >= DEBUG_LEVEL_INFO)
3339                         printk("%s(%d):%s block_til_ready() count=%d\n",
3340                                  __FILE__,__LINE__, tty->driver->name, port->count );
3341 
3342                 tty_unlock(tty);
3343                 schedule();
3344                 tty_lock(tty);
3345         }
3346 
3347         set_current_state(TASK_RUNNING);
3348         remove_wait_queue(&port->open_wait, &wait);
3349         if (!tty_hung_up_p(filp))
3350                 port->count++;
3351         port->blocked_open--;
3352 
3353         if (debug_level >= DEBUG_LEVEL_INFO)
3354                 printk("%s(%d):%s block_til_ready() after, count=%d\n",
3355                          __FILE__,__LINE__, tty->driver->name, port->count );
3356 
3357         if (!retval)
3358                 port->flags |= ASYNC_NORMAL_ACTIVE;
3359 
3360         return retval;
3361 }
3362 
3363 static int alloc_dma_bufs(SLMP_INFO *info)
3364 {
3365         unsigned short BuffersPerFrame;
3366         unsigned short BufferCount;
3367 
3368         // Force allocation to start at 64K boundary for each port.
3369         // This is necessary because *all* buffer descriptors for a port
3370         // *must* be in the same 64K block. All descriptors on a port
3371         // share a common 'base' address (upper 8 bits of 24 bits) programmed
3372         // into the CBP register.
3373         info->port_array[0]->last_mem_alloc = (SCA_MEM_SIZE/4) * info->port_num;
3374 
3375         /* Calculate the number of DMA buffers necessary to hold the */
3376         /* largest allowable frame size. Note: If the max frame size is */
3377         /* not an even multiple of the DMA buffer size then we need to */
3378         /* round the buffer count per frame up one. */
3379 
3380         BuffersPerFrame = (unsigned short)(info->max_frame_size/SCABUFSIZE);
3381         if ( info->max_frame_size % SCABUFSIZE )
3382                 BuffersPerFrame++;
3383 
3384         /* calculate total number of data buffers (SCABUFSIZE) possible
3385          * in one ports memory (SCA_MEM_SIZE/4) after allocating memory
3386          * for the descriptor list (BUFFERLISTSIZE).
3387          */
3388         BufferCount = (SCA_MEM_SIZE/4 - BUFFERLISTSIZE)/SCABUFSIZE;
3389 
3390         /* limit number of buffers to maximum amount of descriptors */
3391         if (BufferCount > BUFFERLISTSIZE/sizeof(SCADESC))
3392                 BufferCount = BUFFERLISTSIZE/sizeof(SCADESC);
3393 
3394         /* use enough buffers to transmit one max size frame */
3395         info->tx_buf_count = BuffersPerFrame + 1;
3396 
3397         /* never use more than half the available buffers for transmit */
3398         if (info->tx_buf_count > (BufferCount/2))
3399                 info->tx_buf_count = BufferCount/2;
3400 
3401         if (info->tx_buf_count > SCAMAXDESC)
3402                 info->tx_buf_count = SCAMAXDESC;
3403 
3404         /* use remaining buffers for receive */
3405         info->rx_buf_count = BufferCount - info->tx_buf_count;
3406 
3407         if (info->rx_buf_count > SCAMAXDESC)
3408                 info->rx_buf_count = SCAMAXDESC;
3409 
3410         if ( debug_level >= DEBUG_LEVEL_INFO )
3411                 printk("%s(%d):%s Allocating %d TX and %d RX DMA buffers.\n",
3412                         __FILE__,__LINE__, info->device_name,
3413                         info->tx_buf_count,info->rx_buf_count);
3414 
3415         if ( alloc_buf_list( info ) < 0 ||
3416                 alloc_frame_bufs(info,
3417                                         info->rx_buf_list,
3418                                         info->rx_buf_list_ex,
3419                                         info->rx_buf_count) < 0 ||
3420                 alloc_frame_bufs(info,
3421                                         info->tx_buf_list,
3422                                         info->tx_buf_list_ex,
3423                                         info->tx_buf_count) < 0 ||
3424                 alloc_tmp_rx_buf(info) < 0 ) {
3425                 printk("%s(%d):%s Can't allocate DMA buffer memory\n",
3426                         __FILE__,__LINE__, info->device_name);
3427                 return -ENOMEM;
3428         }
3429 
3430         rx_reset_buffers( info );
3431 
3432         return 0;
3433 }
3434 
3435 /* Allocate DMA buffers for the transmit and receive descriptor lists.
3436  */
3437 static int alloc_buf_list(SLMP_INFO *info)
3438 {
3439         unsigned int i;
3440 
3441         /* build list in adapter shared memory */
3442         info->buffer_list = info->memory_base + info->port_array[0]->last_mem_alloc;
3443         info->buffer_list_phys = info->port_array[0]->last_mem_alloc;
3444         info->port_array[0]->last_mem_alloc += BUFFERLISTSIZE;
3445 
3446         memset(info->buffer_list, 0, BUFFERLISTSIZE);
3447 
3448         /* Save virtual address pointers to the receive and */
3449         /* transmit buffer lists. (Receive 1st). These pointers will */
3450         /* be used by the processor to access the lists. */
3451         info->rx_buf_list = (SCADESC *)info->buffer_list;
3452 
3453         info->tx_buf_list = (SCADESC *)info->buffer_list;
3454         info->tx_buf_list += info->rx_buf_count;
3455 
3456         /* Build links for circular buffer entry lists (tx and rx)
3457          *
3458          * Note: links are physical addresses read by the SCA device
3459          * to determine the next buffer entry to use.
3460          */
3461 
3462         for ( i = 0; i < info->rx_buf_count; i++ ) {
3463                 /* calculate and store physical address of this buffer entry */
3464                 info->rx_buf_list_ex[i].phys_entry =
3465                         info->buffer_list_phys + (i * SCABUFSIZE);
3466 
3467                 /* calculate and store physical address of */
3468                 /* next entry in cirular list of entries */
3469                 info->rx_buf_list[i].next = info->buffer_list_phys;
3470                 if ( i < info->rx_buf_count - 1 )
3471                         info->rx_buf_list[i].next += (i + 1) * sizeof(SCADESC);
3472 
3473                 info->rx_buf_list[i].length = SCABUFSIZE;
3474         }
3475 
3476         for ( i = 0; i < info->tx_buf_count; i++ ) {
3477                 /* calculate and store physical address of this buffer entry */
3478                 info->tx_buf_list_ex[i].phys_entry = info->buffer_list_phys +
3479                         ((info->rx_buf_count + i) * sizeof(SCADESC));
3480 
3481                 /* calculate and store physical address of */
3482                 /* next entry in cirular list of entries */
3483 
3484                 info->tx_buf_list[i].next = info->buffer_list_phys +
3485                         info->rx_buf_count * sizeof(SCADESC);
3486 
3487                 if ( i < info->tx_buf_count - 1 )
3488                         info->tx_buf_list[i].next += (i + 1) * sizeof(SCADESC);
3489         }
3490 
3491         return 0;
3492 }
3493 
3494 /* Allocate the frame DMA buffers used by the specified buffer list.
3495  */
3496 static int alloc_frame_bufs(SLMP_INFO *info, SCADESC *buf_list,SCADESC_EX *buf_list_ex,int count)
3497 {
3498         int i;
3499         unsigned long phys_addr;
3500 
3501         for ( i = 0; i < count; i++ ) {
3502                 buf_list_ex[i].virt_addr = info->memory_base + info->port_array[0]->last_mem_alloc;
3503                 phys_addr = info->port_array[0]->last_mem_alloc;
3504                 info->port_array[0]->last_mem_alloc += SCABUFSIZE;
3505 
3506                 buf_list[i].buf_ptr  = (unsigned short)phys_addr;
3507                 buf_list[i].buf_base = (unsigned char)(phys_addr >> 16);
3508         }
3509 
3510         return 0;
3511 }
3512 
3513 static void free_dma_bufs(SLMP_INFO *info)
3514 {
3515         info->buffer_list = NULL;
3516         info->rx_buf_list = NULL;
3517         info->tx_buf_list = NULL;
3518 }
3519 
3520 /* allocate buffer large enough to hold max_frame_size.
3521  * This buffer is used to pass an assembled frame to the line discipline.
3522  */
3523 static int alloc_tmp_rx_buf(SLMP_INFO *info)
3524 {
3525         info->tmp_rx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
3526         if (info->tmp_rx_buf == NULL)
3527                 return -ENOMEM;
3528         /* unused flag buffer to satisfy receive_buf calling interface */
3529         info->flag_buf = kzalloc(info->max_frame_size, GFP_KERNEL);
3530         if (!info->flag_buf) {
3531                 kfree(info->tmp_rx_buf);
3532                 info->tmp_rx_buf = NULL;
3533                 return -ENOMEM;
3534         }
3535         return 0;
3536 }
3537 
3538 static void free_tmp_rx_buf(SLMP_INFO *info)
3539 {
3540         kfree(info->tmp_rx_buf);
3541         info->tmp_rx_buf = NULL;
3542         kfree(info->flag_buf);
3543         info->flag_buf = NULL;
3544 }
3545 
3546 static int claim_resources(SLMP_INFO *info)
3547 {
3548         if (request_mem_region(info->phys_memory_base,SCA_MEM_SIZE,"synclinkmp") == NULL) {
3549                 printk( "%s(%d):%s mem addr conflict, Addr=%08X\n",
3550                         __FILE__,__LINE__,info->device_name, info->phys_memory_base);
3551                 info->init_error = DiagStatus_AddressConflict;
3552                 goto errout;
3553         }
3554         else
3555                 info->shared_mem_requested = true;
3556 
3557         if (request_mem_region(info->phys_lcr_base + info->lcr_offset,128,"synclinkmp") == NULL) {
3558                 printk( "%s(%d):%s lcr mem addr conflict, Addr=%08X\n",
3559                         __FILE__,__LINE__,info->device_name, info->phys_lcr_base);
3560                 info->init_error = DiagStatus_AddressConflict;
3561                 goto errout;
3562         }
3563         else
3564                 info->lcr_mem_requested = true;
3565 
3566         if (request_mem_region(info->phys_sca_base + info->sca_offset,SCA_BASE_SIZE,"synclinkmp") == NULL) {
3567                 printk( "%s(%d):%s sca mem addr conflict, Addr=%08X\n",
3568                         __FILE__,__LINE__,info->device_name, info->phys_sca_base);
3569                 info->init_error = DiagStatus_AddressConflict;
3570                 goto errout;
3571         }
3572         else
3573                 info->sca_base_requested = true;
3574 
3575         if (request_mem_region(info->phys_statctrl_base + info->statctrl_offset,SCA_REG_SIZE,"synclinkmp") == NULL) {
3576                 printk( "%s(%d):%s stat/ctrl mem addr conflict, Addr=%08X\n",
3577                         __FILE__,__LINE__,info->device_name, info->phys_statctrl_base);
3578                 info->init_error = DiagStatus_AddressConflict;
3579                 goto errout;
3580         }
3581         else
3582                 info->sca_statctrl_requested = true;
3583 
3584         info->memory_base = ioremap_nocache(info->phys_memory_base,
3585                                                                 SCA_MEM_SIZE);
3586         if (!info->memory_base) {
3587                 printk( "%s(%d):%s Can't map shared memory, MemAddr=%08X\n",
3588                         __FILE__,__LINE__,info->device_name, info->phys_memory_base );
3589                 info->init_error = DiagStatus_CantAssignPciResources;
3590                 goto errout;
3591         }
3592 
3593         info->lcr_base = ioremap_nocache(info->phys_lcr_base, PAGE_SIZE);
3594         if (!info->lcr_base) {
3595                 printk( "%s(%d):%s Can't map LCR memory, MemAddr=%08X\n",
3596                         __FILE__,__LINE__,info->device_name, info->phys_lcr_base );
3597                 info->init_error = DiagStatus_CantAssignPciResources;
3598                 goto errout;
3599         }
3600         info->lcr_base += info->lcr_offset;
3601 
3602         info->sca_base = ioremap_nocache(info->phys_sca_base, PAGE_SIZE);
3603         if (!info->sca_base) {
3604                 printk( "%s(%d):%s Can't map SCA memory, MemAddr=%08X\n",
3605                         __FILE__,__LINE__,info->device_name, info->phys_sca_base );
3606                 info->init_error = DiagStatus_CantAssignPciResources;
3607                 goto errout;
3608         }
3609         info->sca_base += info->sca_offset;
3610 
3611         info->statctrl_base = ioremap_nocache(info->phys_statctrl_base,
3612                                                                 PAGE_SIZE);
3613         if (!info->statctrl_base) {
3614                 printk( "%s(%d):%s Can't map SCA Status/Control memory, MemAddr=%08X\n",
3615                         __FILE__,__LINE__,info->device_name, info->phys_statctrl_base );
3616                 info->init_error = DiagStatus_CantAssignPciResources;
3617                 goto errout;
3618         }
3619         info->statctrl_base += info->statctrl_offset;
3620 
3621         if ( !memory_test(info) ) {
3622                 printk( "%s(%d):Shared Memory Test failed for device %s MemAddr=%08X\n",
3623                         __FILE__,__LINE__,info->device_name, info->phys_memory_base );
3624                 info->init_error = DiagStatus_MemoryError;
3625                 goto errout;
3626         }
3627 
3628         return 0;
3629 
3630 errout:
3631         release_resources( info );
3632         return -ENODEV;
3633 }
3634 
3635 static void release_resources(SLMP_INFO *info)
3636 {
3637         if ( debug_level >= DEBUG_LEVEL_INFO )
3638                 printk( "%s(%d):%s release_resources() entry\n",
3639                         __FILE__,__LINE__,info->device_name );
3640 
3641         if ( info->irq_requested ) {
3642                 free_irq(info->irq_level, info);
3643                 info->irq_requested = false;
3644         }
3645 
3646         if ( info->shared_mem_requested ) {
3647                 release_mem_region(info->phys_memory_base,SCA_MEM_SIZE);
3648                 info->shared_mem_requested = false;
3649         }
3650         if ( info->lcr_mem_requested ) {
3651                 release_mem_region(info->phys_lcr_base + info->lcr_offset,128);
3652                 info->lcr_mem_requested = false;
3653         }
3654         if ( info->sca_base_requested ) {
3655                 release_mem_region(info->phys_sca_base + info->sca_offset,SCA_BASE_SIZE);
3656                 info->sca_base_requested = false;
3657         }
3658         if ( info->sca_statctrl_requested ) {
3659                 release_mem_region(info->phys_statctrl_base + info->statctrl_offset,SCA_REG_SIZE);
3660                 info->sca_statctrl_requested = false;
3661         }
3662 
3663         if (info->memory_base){
3664                 iounmap(info->memory_base);
3665                 info->memory_base = NULL;
3666         }
3667 
3668         if (info->sca_base) {
3669                 iounmap(info->sca_base - info->sca_offset);
3670                 info->sca_base=NULL;
3671         }
3672 
3673         if (info->statctrl_base) {
3674                 iounmap(info->statctrl_base - info->statctrl_offset);
3675                 info->statctrl_base=NULL;
3676         }
3677 
3678         if (info->lcr_base){
3679                 iounmap(info->lcr_base - info->lcr_offset);
3680                 info->lcr_base = NULL;
3681         }
3682 
3683         if ( debug_level >= DEBUG_LEVEL_INFO )
3684                 printk( "%s(%d):%s release_resources() exit\n",
3685                         __FILE__,__LINE__,info->device_name );
3686 }
3687 
3688 /* Add the specified device instance data structure to the
3689  * global linked list of devices and increment the device count.
3690  */
3691 static int add_device(SLMP_INFO *info)
3692 {
3693         info->next_device = NULL;
3694         info->line = synclinkmp_device_count;
3695         sprintf(info->device_name,"ttySLM%dp%d",info->adapter_num,info->port_num);
3696 
3697         if (info->line < MAX_DEVICES) {
3698                 if (maxframe[info->line])
3699                         info->max_frame_size = maxframe[info->line];
3700         }
3701 
3702         synclinkmp_device_count++;
3703 
3704         if ( !synclinkmp_device_list )
3705                 synclinkmp_device_list = info;
3706         else {
3707                 SLMP_INFO *current_dev = synclinkmp_device_list;
3708                 while( current_dev->next_device )
3709                         current_dev = current_dev->next_device;
3710                 current_dev->next_device = info;
3711         }
3712 
3713         if ( info->max_frame_size < 4096 )
3714                 info->max_frame_size = 4096;
3715         else if ( info->max_frame_size > 65535 )
3716                 info->max_frame_size = 65535;
3717 
3718         printk( "SyncLink MultiPort %s: "
3719                 "Mem=(%08x %08X %08x %08X) IRQ=%d MaxFrameSize=%u\n",
3720                 info->device_name,
3721                 info->phys_sca_base,
3722                 info->phys_memory_base,
3723                 info->phys_statctrl_base,
3724                 info->phys_lcr_base,
3725                 info->irq_level,
3726                 info->max_frame_size );
3727 
3728 #if SYNCLINK_GENERIC_HDLC
3729         return hdlcdev_init(info);
3730 #else
3731         return 0;
3732 #endif
3733 }
3734 
3735 static const struct tty_port_operations port_ops = {
3736         .carrier_raised = carrier_raised,
3737         .dtr_rts = dtr_rts,
3738 };
3739 
3740 /* Allocate and initialize a device instance structure
3741  *
3742  * Return Value:        pointer to SLMP_INFO if success, otherwise NULL
3743  */
3744 static SLMP_INFO *alloc_dev(int adapter_num, int port_num, struct pci_dev *pdev)
3745 {
3746         SLMP_INFO *info;
3747 
3748         info = kzalloc(sizeof(SLMP_INFO),
3749                  GFP_KERNEL);
3750 
3751         if (!info) {
3752                 printk("%s(%d) Error can't allocate device instance data for adapter %d, port %d\n",
3753                         __FILE__,__LINE__, adapter_num, port_num);
3754         } else {
3755                 tty_port_init(&info->port);
3756                 info->port.ops = &port_ops;
3757                 info->magic = MGSL_MAGIC;
3758                 INIT_WORK(&info->task, bh_handler);
3759                 info->max_frame_size = 4096;
3760                 info->port.close_delay = 5*HZ/10;
3761                 info->port.closing_wait = 30*HZ;
3762                 init_waitqueue_head(&info->status_event_wait_q);
3763                 init_waitqueue_head(&info->event_wait_q);
3764                 spin_lock_init(&info->netlock);
3765                 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
3766                 info->idle_mode = HDLC_TXIDLE_FLAGS;
3767                 info->adapter_num = adapter_num;
3768                 info->port_num = port_num;
3769 
3770                 /* Copy configuration info to device instance data */
3771                 info->irq_level = pdev->irq;
3772                 info->phys_lcr_base = pci_resource_start(pdev,0);
3773                 info->phys_sca_base = pci_resource_start(pdev,2);
3774                 info->phys_memory_base = pci_resource_start(pdev,3);
3775                 info->phys_statctrl_base = pci_resource_start(pdev,4);
3776 
3777                 /* Because veremap only works on page boundaries we must map
3778                  * a larger area than is actually implemented for the LCR
3779                  * memory range. We map a full page starting at the page boundary.
3780                  */
3781                 info->lcr_offset    = info->phys_lcr_base & (PAGE_SIZE-1);
3782                 info->phys_lcr_base &= ~(PAGE_SIZE-1);
3783 
3784                 info->sca_offset    = info->phys_sca_base & (PAGE_SIZE-1);
3785                 info->phys_sca_base &= ~(PAGE_SIZE-1);
3786 
3787                 info->statctrl_offset    = info->phys_statctrl_base & (PAGE_SIZE-1);
3788                 info->phys_statctrl_base &= ~(PAGE_SIZE-1);
3789 
3790                 info->bus_type = MGSL_BUS_TYPE_PCI;
3791                 info->irq_flags = IRQF_SHARED;
3792 
3793                 setup_timer(&info->tx_timer, tx_timeout, (unsigned long)info);
3794                 setup_timer(&info->status_timer, status_timeout,
3795                                 (unsigned long)info);
3796 
3797                 /* Store the PCI9050 misc control register value because a flaw
3798                  * in the PCI9050 prevents LCR registers from being read if
3799                  * BIOS assigns an LCR base address with bit 7 set.
3800                  *
3801                  * Only the misc control register is accessed for which only
3802                  * write access is needed, so set an initial value and change
3803                  * bits to the device instance data as we write the value
3804                  * to the actual misc control register.
3805                  */
3806                 info->misc_ctrl_value = 0x087e4546;
3807 
3808                 /* initial port state is unknown - if startup errors
3809                  * occur, init_error will be set to indicate the
3810                  * problem. Once the port is fully initialized,
3811                  * this value will be set to 0 to indicate the
3812                  * port is available.
3813                  */
3814                 info->init_error = -1;
3815         }
3816 
3817         return info;
3818 }
3819 
3820 static int device_init(int adapter_num, struct pci_dev *pdev)
3821 {
3822         SLMP_INFO *port_array[SCA_MAX_PORTS];
3823         int port, rc;
3824 
3825         /* allocate device instances for up to SCA_MAX_PORTS devices */
3826         for ( port = 0; port < SCA_MAX_PORTS; ++port ) {
3827                 port_array[port] = alloc_dev(adapter_num,port,pdev);
3828                 if( port_array[port] == NULL ) {
3829                         for (--port; port >= 0; --port) {
3830                                 tty_port_destroy(&port_array[port]->port);
3831                                 kfree(port_array[port]);
3832                         }
3833                         return -ENOMEM;
3834                 }
3835         }
3836 
3837         /* give copy of port_array to all ports and add to device list  */
3838         for ( port = 0; port < SCA_MAX_PORTS; ++port ) {
3839                 memcpy(port_array[port]->port_array,port_array,sizeof(port_array));
3840                 rc = add_device( port_array[port] );
3841                 if (rc)
3842                         goto err_add;
3843                 spin_lock_init(&port_array[port]->lock);
3844         }
3845 
3846         /* Allocate and claim adapter resources */
3847         if ( !claim_resources(port_array[0]) ) {
3848 
3849                 alloc_dma_bufs(port_array[0]);
3850 
3851                 /* copy resource information from first port to others */
3852                 for ( port = 1; port < SCA_MAX_PORTS; ++port ) {
3853                         port_array[port]->lock  = port_array[0]->lock;
3854                         port_array[port]->irq_level     = port_array[0]->irq_level;
3855                         port_array[port]->memory_base   = port_array[0]->memory_base;
3856                         port_array[port]->sca_base      = port_array[0]->sca_base;
3857                         port_array[port]->statctrl_base = port_array[0]->statctrl_base;
3858                         port_array[port]->lcr_base      = port_array[0]->lcr_base;
3859                         alloc_dma_bufs(port_array[port]);
3860                 }
3861 
3862                 rc = request_irq(port_array[0]->irq_level,
3863                                         synclinkmp_interrupt,
3864                                         port_array[0]->irq_flags,
3865                                         port_array[0]->device_name,
3866                                         port_array[0]);
3867                 if ( rc ) {
3868                         printk( "%s(%d):%s Can't request interrupt, IRQ=%d\n",
3869                                 __FILE__,__LINE__,
3870                                 port_array[0]->device_name,
3871                                 port_array[0]->irq_level );
3872                         goto err_irq;
3873                 }
3874                 port_array[0]->irq_requested = true;
3875                 adapter_test(port_array[0]);
3876         }
3877         return 0;
3878 err_irq:
3879         release_resources( port_array[0] );
3880 err_add:
3881         for ( port = 0; port < SCA_MAX_PORTS; ++port ) {
3882                 tty_port_destroy(&port_array[port]->port);
3883                 kfree(port_array[port]);
3884         }
3885         return rc;
3886 }
3887 
3888 static const struct tty_operations ops = {
3889         .install = install,
3890         .open = open,
3891         .close = close,
3892         .write = write,
3893         .put_char = put_char,
3894         .flush_chars = flush_chars,
3895         .write_room = write_room,
3896         .chars_in_buffer = chars_in_buffer,
3897         .flush_buffer = flush_buffer,
3898         .ioctl = ioctl,
3899         .throttle = throttle,
3900         .unthrottle = unthrottle,
3901         .send_xchar = send_xchar,
3902         .break_ctl = set_break,
3903         .wait_until_sent = wait_until_sent,
3904         .set_termios = set_termios,
3905         .stop = tx_hold,
3906         .start = tx_release,
3907         .hangup = hangup,
3908         .tiocmget = tiocmget,
3909         .tiocmset = tiocmset,
3910         .get_icount = get_icount,
3911         .proc_fops = &synclinkmp_proc_fops,
3912 };
3913 
3914 
3915 static void synclinkmp_cleanup(void)
3916 {
3917         int rc;
3918         SLMP_INFO *info;
3919         SLMP_INFO *tmp;
3920 
3921         printk("Unloading %s %s\n", driver_name, driver_version);
3922 
3923         if (serial_driver) {
3924                 rc = tty_unregister_driver(serial_driver);
3925                 if (rc)
3926                         printk("%s(%d) failed to unregister tty driver err=%d\n",
3927                                __FILE__,__LINE__,rc);
3928                 put_tty_driver(serial_driver);
3929         }
3930 
3931         /* reset devices */
3932         info = synclinkmp_device_list;
3933         while(info) {
3934                 reset_port(info);
3935                 info = info->next_device;
3936         }
3937 
3938         /* release devices */
3939         info = synclinkmp_device_list;
3940         while(info) {
3941 #if SYNCLINK_GENERIC_HDLC
3942                 hdlcdev_exit(info);
3943 #endif
3944                 free_dma_bufs(info);
3945                 free_tmp_rx_buf(info);
3946                 if ( info->port_num == 0 ) {
3947                         if (info->sca_base)
3948                                 write_reg(info, LPR, 1); /* set low power mode */
3949                         release_resources(info);
3950                 }
3951                 tmp = info;
3952                 info = info->next_device;
3953                 tty_port_destroy(&tmp->port);
3954                 kfree(tmp);
3955         }
3956 
3957         pci_unregister_driver(&synclinkmp_pci_driver);
3958 }
3959 
3960 /* Driver initialization entry point.
3961  */
3962 
3963 static int __init synclinkmp_init(void)
3964 {
3965         int rc;
3966 
3967         if (break_on_load) {
3968                 synclinkmp_get_text_ptr();
3969                 BREAKPOINT();
3970         }
3971 
3972         printk("%s %s\n", driver_name, driver_version);
3973 
3974         if ((rc = pci_register_driver(&synclinkmp_pci_driver)) < 0) {
3975                 printk("%s:failed to register PCI driver, error=%d\n",__FILE__,rc);
3976                 return rc;
3977         }
3978 
3979         serial_driver = alloc_tty_driver(128);
3980         if (!serial_driver) {
3981                 rc = -ENOMEM;
3982                 goto error;
3983         }
3984 
3985         /* Initialize the tty_driver structure */
3986 
3987         serial_driver->driver_name = "synclinkmp";
3988         serial_driver->name = "ttySLM";
3989         serial_driver->major = ttymajor;
3990         serial_driver->minor_start = 64;
3991         serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
3992         serial_driver->subtype = SERIAL_TYPE_NORMAL;
3993         serial_driver->init_termios = tty_std_termios;
3994         serial_driver->init_termios.c_cflag =
3995                 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
3996         serial_driver->init_termios.c_ispeed = 9600;
3997         serial_driver->init_termios.c_ospeed = 9600;
3998         serial_driver->flags = TTY_DRIVER_REAL_RAW;
3999         tty_set_operations(serial_driver, &ops);
4000         if ((rc = tty_register_driver(serial_driver)) < 0) {
4001                 printk("%s(%d):Couldn't register serial driver\n",
4002                         __FILE__,__LINE__);
4003                 put_tty_driver(serial_driver);
4004                 serial_driver = NULL;
4005                 goto error;
4006         }
4007 
4008         printk("%s %s, tty major#%d\n",
4009                 driver_name, driver_version,
4010                 serial_driver->major);
4011 
4012         return 0;
4013 
4014 error:
4015         synclinkmp_cleanup();
4016         return rc;
4017 }
4018 
4019 static void __exit synclinkmp_exit(void)
4020 {
4021         synclinkmp_cleanup();
4022 }
4023 
4024 module_init(synclinkmp_init);
4025 module_exit(synclinkmp_exit);
4026 
4027 /* Set the port for internal loopback mode.
4028  * The TxCLK and RxCLK signals are generated from the BRG and
4029  * the TxD is looped back to the RxD internally.
4030  */
4031 static void enable_loopback(SLMP_INFO *info, int enable)
4032 {
4033         if (enable) {
4034                 /* MD2 (Mode Register 2)
4035                  * 01..00  CNCT<1..0> Channel Connection 11=Local Loopback
4036                  */
4037                 write_reg(info, MD2, (unsigned char)(read_reg(info, MD2) | (BIT1 + BIT0)));
4038 
4039                 /* degate external TxC clock source */
4040                 info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4041                 write_control_reg(info);
4042 
4043                 /* RXS/TXS (Rx/Tx clock source)
4044                  * 07      Reserved, must be 0
4045                  * 06..04  Clock Source, 100=BRG
4046                  * 03..00  Clock Divisor, 0000=1
4047                  */
4048                 write_reg(info, RXS, 0x40);
4049                 write_reg(info, TXS, 0x40);
4050 
4051         } else {
4052                 /* MD2 (Mode Register 2)
4053                  * 01..00  CNCT<1..0> Channel connection, 0=normal
4054                  */
4055                 write_reg(info, MD2, (unsigned char)(read_reg(info, MD2) & ~(BIT1 + BIT0)));
4056 
4057                 /* RXS/TXS (Rx/Tx clock source)
4058                  * 07      Reserved, must be 0
4059                  * 06..04  Clock Source, 000=RxC/TxC Pin
4060                  * 03..00  Clock Divisor, 0000=1
4061                  */
4062                 write_reg(info, RXS, 0x00);
4063                 write_reg(info, TXS, 0x00);
4064         }
4065 
4066         /* set LinkSpeed if available, otherwise default to 2Mbps */
4067         if (info->params.clock_speed)
4068                 set_rate(info, info->params.clock_speed);
4069         else
4070                 set_rate(info, 3686400);
4071 }
4072 
4073 /* Set the baud rate register to the desired speed
4074  *
4075  *      data_rate       data rate of clock in bits per second
4076  *                      A data rate of 0 disables the AUX clock.
4077  */
4078 static void set_rate( SLMP_INFO *info, u32 data_rate )
4079 {
4080         u32 TMCValue;
4081         unsigned char BRValue;
4082         u32 Divisor=0;
4083 
4084         /* fBRG = fCLK/(TMC * 2^BR)
4085          */
4086         if (data_rate != 0) {
4087                 Divisor = 14745600/data_rate;
4088                 if (!Divisor)
4089                         Divisor = 1;
4090 
4091                 TMCValue = Divisor;
4092 
4093                 BRValue = 0;
4094                 if (TMCValue != 1 && TMCValue != 2) {
4095                         /* BRValue of 0 provides 50/50 duty cycle *only* when
4096                          * TMCValue is 1 or 2. BRValue of 1 to 9 always provides
4097                          * 50/50 duty cycle.
4098                          */
4099                         BRValue = 1;
4100                         TMCValue >>= 1;
4101                 }
4102 
4103                 /* while TMCValue is too big for TMC register, divide
4104                  * by 2 and increment BR exponent.
4105                  */
4106                 for(; TMCValue > 256 && BRValue < 10; BRValue++)
4107                         TMCValue >>= 1;
4108 
4109                 write_reg(info, TXS,
4110                         (unsigned char)((read_reg(info, TXS) & 0xf0) | BRValue));
4111                 write_reg(info, RXS,
4112                         (unsigned char)((read_reg(info, RXS) & 0xf0) | BRValue));
4113                 write_reg(info, TMC, (unsigned char)TMCValue);
4114         }
4115         else {
4116                 write_reg(info, TXS,0);
4117                 write_reg(info, RXS,0);
4118                 write_reg(info, TMC, 0);
4119         }
4120 }
4121 
4122 /* Disable receiver
4123  */
4124 static void rx_stop(SLMP_INFO *info)
4125 {
4126         if (debug_level >= DEBUG_LEVEL_ISR)
4127                 printk("%s(%d):%s rx_stop()\n",
4128                          __FILE__,__LINE__, info->device_name );
4129 
4130         write_reg(info, CMD, RXRESET);
4131 
4132         info->ie0_value &= ~RXRDYE;
4133         write_reg(info, IE0, info->ie0_value);  /* disable Rx data interrupts */
4134 
4135         write_reg(info, RXDMA + DSR, 0);        /* disable Rx DMA */
4136         write_reg(info, RXDMA + DCMD, SWABORT); /* reset/init Rx DMA */
4137         write_reg(info, RXDMA + DIR, 0);        /* disable Rx DMA interrupts */
4138 
4139         info->rx_enabled = false;
4140         info->rx_overflow = false;
4141 }
4142 
4143 /* enable the receiver
4144  */
4145 static void rx_start(SLMP_INFO *info)
4146 {
4147         int i;
4148 
4149         if (debug_level >= DEBUG_LEVEL_ISR)
4150                 printk("%s(%d):%s rx_start()\n",
4151                          __FILE__,__LINE__, info->device_name );
4152 
4153         write_reg(info, CMD, RXRESET);
4154 
4155         if ( info->params.mode == MGSL_MODE_HDLC ) {
4156                 /* HDLC, disabe IRQ on rxdata */
4157                 info->ie0_value &= ~RXRDYE;
4158                 write_reg(info, IE0, info->ie0_value);
4159 
4160                 /* Reset all Rx DMA buffers and program rx dma */
4161                 write_reg(info, RXDMA + DSR, 0);                /* disable Rx DMA */
4162                 write_reg(info, RXDMA + DCMD, SWABORT); /* reset/init Rx DMA */
4163 
4164                 for (i = 0; i < info->rx_buf_count; i++) {
4165                         info->rx_buf_list[i].status = 0xff;
4166 
4167                         // throttle to 4 shared memory writes at a time to prevent
4168                         // hogging local bus (keep latency time for DMA requests low).
4169                         if (!(i % 4))
4170                                 read_status_reg(info);
4171                 }
4172                 info->current_rx_buf = 0;
4173 
4174                 /* set current/1st descriptor address */
4175                 write_reg16(info, RXDMA + CDA,
4176                         info->rx_buf_list_ex[0].phys_entry);
4177 
4178                 /* set new last rx descriptor address */
4179                 write_reg16(info, RXDMA + EDA,
4180                         info->rx_buf_list_ex[info->rx_buf_count - 1].phys_entry);
4181 
4182                 /* set buffer length (shared by all rx dma data buffers) */
4183                 write_reg16(info, RXDMA + BFL, SCABUFSIZE);
4184 
4185                 write_reg(info, RXDMA + DIR, 0x60);     /* enable Rx DMA interrupts (EOM/BOF) */
4186                 write_reg(info, RXDMA + DSR, 0xf2);     /* clear Rx DMA IRQs, enable Rx DMA */
4187         } else {
4188                 /* async, enable IRQ on rxdata */
4189                 info->ie0_value |= RXRDYE;
4190                 write_reg(info, IE0, info->ie0_value);
4191         }
4192 
4193         write_reg(info, CMD, RXENABLE);
4194 
4195         info->rx_overflow = false;
4196         info->rx_enabled = true;
4197 }
4198 
4199 /* Enable the transmitter and send a transmit frame if
4200  * one is loaded in the DMA buffers.
4201  */
4202 static void tx_start(SLMP_INFO *info)
4203 {
4204         if (debug_level >= DEBUG_LEVEL_ISR)
4205                 printk("%s(%d):%s tx_start() tx_count=%d\n",
4206                          __FILE__,__LINE__, info->device_name,info->tx_count );
4207 
4208         if (!info->tx_enabled ) {
4209                 write_reg(info, CMD, TXRESET);
4210                 write_reg(info, CMD, TXENABLE);
4211                 info->tx_enabled = true;
4212         }
4213 
4214         if ( info->tx_count ) {
4215 
4216                 /* If auto RTS enabled and RTS is inactive, then assert */
4217                 /* RTS and set a flag indicating that the driver should */
4218                 /* negate RTS when the transmission completes. */
4219 
4220                 info->drop_rts_on_tx_done = false;
4221 
4222                 if (info->params.mode != MGSL_MODE_ASYNC) {
4223 
4224                         if ( info->params.flags & HDLC_FLAG_AUTO_RTS ) {
4225                                 get_signals( info );
4226                                 if ( !(info->serial_signals & SerialSignal_RTS) ) {
4227                                         info->serial_signals |= SerialSignal_RTS;
4228                                         set_signals( info );
4229                                         info->drop_rts_on_tx_done = true;
4230                                 }
4231                         }
4232 
4233                         write_reg16(info, TRC0,
4234                                 (unsigned short)(((tx_negate_fifo_level-1)<<8) + tx_active_fifo_level));
4235 
4236                         write_reg(info, TXDMA + DSR, 0);                /* disable DMA channel */
4237                         write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
4238         
4239                         /* set TX CDA (current descriptor address) */
4240                         write_reg16(info, TXDMA + CDA,
4241                                 info->tx_buf_list_ex[0].phys_entry);
4242         
4243                         /* set TX EDA (last descriptor address) */
4244                         write_reg16(info, TXDMA + EDA,
4245                                 info->tx_buf_list_ex[info->last_tx_buf].phys_entry);
4246         
4247                         /* enable underrun IRQ */
4248                         info->ie1_value &= ~IDLE;
4249                         info->ie1_value |= UDRN;
4250                         write_reg(info, IE1, info->ie1_value);
4251                         write_reg(info, SR1, (unsigned char)(IDLE + UDRN));
4252         
4253                         write_reg(info, TXDMA + DIR, 0x40);             /* enable Tx DMA interrupts (EOM) */
4254                         write_reg(info, TXDMA + DSR, 0xf2);             /* clear Tx DMA IRQs, enable Tx DMA */
4255         
4256                         mod_timer(&info->tx_timer, jiffies +
4257                                         msecs_to_jiffies(5000));
4258                 }
4259                 else {
4260                         tx_load_fifo(info);
4261                         /* async, enable IRQ on txdata */
4262                         info->ie0_value |= TXRDYE;
4263                         write_reg(info, IE0, info->ie0_value);
4264                 }
4265 
4266                 info->tx_active = true;
4267         }
4268 }
4269 
4270 /* stop the transmitter and DMA
4271  */
4272 static void tx_stop( SLMP_INFO *info )
4273 {
4274         if (debug_level >= DEBUG_LEVEL_ISR)
4275                 printk("%s(%d):%s tx_stop()\n",
4276                          __FILE__,__LINE__, info->device_name );
4277 
4278         del_timer(&info->tx_timer);
4279 
4280         write_reg(info, TXDMA + DSR, 0);                /* disable DMA channel */
4281         write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
4282 
4283         write_reg(info, CMD, TXRESET);
4284 
4285         info->ie1_value &= ~(UDRN + IDLE);
4286         write_reg(info, IE1, info->ie1_value);  /* disable tx status interrupts */
4287         write_reg(info, SR1, (unsigned char)(IDLE + UDRN));     /* clear pending */
4288 
4289         info->ie0_value &= ~TXRDYE;
4290         write_reg(info, IE0, info->ie0_value);  /* disable tx data interrupts */
4291 
4292         info->tx_enabled = false;
4293         info->tx_active = false;
4294 }
4295 
4296 /* Fill the transmit FIFO until the FIFO is full or
4297  * there is no more data to load.
4298  */
4299 static void tx_load_fifo(SLMP_INFO *info)
4300 {
4301         u8 TwoBytes[2];
4302 
4303         /* do nothing is now tx data available and no XON/XOFF pending */
4304 
4305         if ( !info->tx_count && !info->x_char )
4306                 return;
4307 
4308         /* load the Transmit FIFO until FIFOs full or all data sent */
4309 
4310         while( info->tx_count && (read_reg(info,SR0) & BIT1) ) {
4311 
4312                 /* there is more space in the transmit FIFO and */
4313                 /* there is more data in transmit buffer */
4314 
4315                 if ( (info->tx_count > 1) && !info->x_char ) {
4316                         /* write 16-bits */
4317                         TwoBytes[0] = info->tx_buf[info->tx_get++];
4318                         if (info->tx_get >= info->max_frame_size)
4319                                 info->tx_get -= info->max_frame_size;
4320                         TwoBytes[1] = info->tx_buf[info->tx_get++];
4321                         if (info->tx_get >= info->max_frame_size)
4322                                 info->tx_get -= info->max_frame_size;
4323 
4324                         write_reg16(info, TRB, *((u16 *)TwoBytes));
4325 
4326                         info->tx_count -= 2;
4327                         info->icount.tx += 2;
4328                 } else {
4329                         /* only 1 byte left to transmit or 1 FIFO slot left */
4330 
4331                         if (info->x_char) {
4332                                 /* transmit pending high priority char */
4333                                 write_reg(info, TRB, info->x_char);
4334                                 info->x_char = 0;
4335                         } else {
4336                                 write_reg(info, TRB, info->tx_buf[info->tx_get++]);
4337                                 if (info->tx_get >= info->max_frame_size)
4338                                         info->tx_get -= info->max_frame_size;
4339                                 info->tx_count--;
4340                         }
4341                         info->icount.tx++;
4342                 }
4343         }
4344 }
4345 
4346 /* Reset a port to a known state
4347  */
4348 static void reset_port(SLMP_INFO *info)
4349 {
4350         if (info->sca_base) {
4351 
4352                 tx_stop(info);
4353                 rx_stop(info);
4354 
4355                 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
4356                 set_signals(info);
4357 
4358                 /* disable all port interrupts */
4359                 info->ie0_value = 0;
4360                 info->ie1_value = 0;
4361                 info->ie2_value = 0;
4362                 write_reg(info, IE0, info->ie0_value);
4363                 write_reg(info, IE1, info->ie1_value);
4364                 write_reg(info, IE2, info->ie2_value);
4365 
4366                 write_reg(info, CMD, CHRESET);
4367         }
4368 }
4369 
4370 /* Reset all the ports to a known state.
4371  */
4372 static void reset_adapter(SLMP_INFO *info)
4373 {
4374         int i;
4375 
4376         for ( i=0; i < SCA_MAX_PORTS; ++i) {
4377                 if (info->port_array[i])
4378                         reset_port(info->port_array[i]);
4379         }
4380 }
4381 
4382 /* Program port for asynchronous communications.
4383  */
4384 static void async_mode(SLMP_INFO *info)
4385 {
4386 
4387         unsigned char RegValue;
4388 
4389         tx_stop(info);
4390         rx_stop(info);
4391 
4392         /* MD0, Mode Register 0
4393          *
4394          * 07..05  PRCTL<2..0>, Protocol Mode, 000=async
4395          * 04      AUTO, Auto-enable (RTS/CTS/DCD)
4396          * 03      Reserved, must be 0
4397          * 02      CRCCC, CRC Calculation, 0=disabled
4398          * 01..00  STOP<1..0> Stop bits (00=1,10=2)
4399          *
4400          * 0000 0000
4401          */
4402         RegValue = 0x00;
4403         if (info->params.stop_bits != 1)
4404                 RegValue |= BIT1;
4405         write_reg(info, MD0, RegValue);
4406 
4407         /* MD1, Mode Register 1
4408          *
4409          * 07..06  BRATE<1..0>, bit rate, 00=1/1 01=1/16 10=1/32 11=1/64
4410          * 05..04  TXCHR<1..0>, tx char size, 00=8 bits,01=7,10=6,11=5
4411          * 03..02  RXCHR<1..0>, rx char size
4412          * 01..00  PMPM<1..0>, Parity mode, 00=none 10=even 11=odd
4413          *
4414          * 0100 0000
4415          */
4416         RegValue = 0x40;
4417         switch (info->params.data_bits) {
4418         case 7: RegValue |= BIT4 + BIT2; break;
4419         case 6: RegValue |= BIT5 + BIT3; break;
4420         case 5: RegValue |= BIT5 + BIT4 + BIT3 + BIT2; break;
4421         }
4422         if (info->params.parity != ASYNC_PARITY_NONE) {
4423                 RegValue |= BIT1;
4424                 if (info->params.parity == ASYNC_PARITY_ODD)
4425                         RegValue |= BIT0;
4426         }
4427         write_reg(info, MD1, RegValue);
4428 
4429         /* MD2, Mode Register 2
4430          *
4431          * 07..02  Reserved, must be 0
4432          * 01..00  CNCT<1..0> Channel connection, 00=normal 11=local loopback
4433          *
4434          * 0000 0000
4435          */
4436         RegValue = 0x00;
4437         if (info->params.loopback)
4438                 RegValue |= (BIT1 + BIT0);
4439         write_reg(info, MD2, RegValue);
4440 
4441         /* RXS, Receive clock source
4442          *
4443          * 07      Reserved, must be 0
4444          * 06..04  RXCS<2..0>, clock source, 000=RxC Pin, 100=BRG, 110=DPLL
4445          * 03..00  RXBR<3..0>, rate divisor, 0000=1
4446          */
4447         RegValue=BIT6;
4448         write_reg(info, RXS, RegValue);
4449 
4450         /* TXS, Transmit clock source
4451          *
4452          * 07      Reserved, must be 0
4453          * 06..04  RXCS<2..0>, clock source, 000=TxC Pin, 100=BRG, 110=Receive Clock
4454          * 03..00  RXBR<3..0>, rate divisor, 0000=1
4455          */
4456         RegValue=BIT6;
4457         write_reg(info, TXS, RegValue);
4458 
4459         /* Control Register
4460          *
4461          * 6,4,2,0  CLKSEL<3..0>, 0 = TcCLK in, 1 = Auxclk out
4462          */
4463         info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4464         write_control_reg(info);
4465 
4466         tx_set_idle(info);
4467 
4468         /* RRC Receive Ready Control 0
4469          *
4470          * 07..05  Reserved, must be 0
4471          * 04..00  RRC<4..0> Rx FIFO trigger active 0x00 = 1 byte
4472          */
4473         write_reg(info, RRC, 0x00);
4474 
4475         /* TRC0 Transmit Ready Control 0
4476          *
4477          * 07..05  Reserved, must be 0
4478          * 04..00  TRC<4..0> Tx FIFO trigger active 0x10 = 16 bytes
4479          */
4480         write_reg(info, TRC0, 0x10);
4481 
4482         /* TRC1 Transmit Ready Control 1
4483          *
4484          * 07..05  Reserved, must be 0
4485          * 04..00  TRC<4..0> Tx FIFO trigger inactive 0x1e = 31 bytes (full-1)
4486          */
4487         write_reg(info, TRC1, 0x1e);
4488 
4489         /* CTL, MSCI control register
4490          *
4491          * 07..06  Reserved, set to 0
4492          * 05      UDRNC, underrun control, 0=abort 1=CRC+flag (HDLC/BSC)
4493          * 04      IDLC, idle control, 0=mark 1=idle register
4494          * 03      BRK, break, 0=off 1 =on (async)
4495          * 02      SYNCLD, sync char load enable (BSC) 1=enabled
4496          * 01      GOP, go active on poll (LOOP mode) 1=enabled
4497          * 00      RTS, RTS output control, 0=active 1=inactive
4498          *
4499          * 0001 0001
4500          */
4501         RegValue = 0x10;
4502         if (!(info->serial_signals & SerialSignal_RTS))
4503                 RegValue |= 0x01;
4504         write_reg(info, CTL, RegValue);
4505 
4506         /* enable status interrupts */
4507         info->ie0_value |= TXINTE + RXINTE;
4508         write_reg(info, IE0, info->ie0_value);
4509 
4510         /* enable break detect interrupt */
4511         info->ie1_value = BRKD;
4512         write_reg(info, IE1, info->ie1_value);
4513 
4514         /* enable rx overrun interrupt */
4515         info->ie2_value = OVRN;
4516         write_reg(info, IE2, info->ie2_value);
4517 
4518         set_rate( info, info->params.data_rate * 16 );
4519 }
4520 
4521 /* Program the SCA for HDLC communications.
4522  */
4523 static void hdlc_mode(SLMP_INFO *info)
4524 {
4525         unsigned char RegValue;
4526         u32 DpllDivisor;
4527 
4528         // Can't use DPLL because SCA outputs recovered clock on RxC when
4529         // DPLL mode selected. This causes output contention with RxC receiver.
4530         // Use of DPLL would require external hardware to disable RxC receiver
4531         // when DPLL mode selected.
4532         info->params.flags &= ~(HDLC_FLAG_TXC_DPLL + HDLC_FLAG_RXC_DPLL);
4533 
4534         /* disable DMA interrupts */
4535         write_reg(info, TXDMA + DIR, 0);
4536         write_reg(info, RXDMA + DIR, 0);
4537 
4538         /* MD0, Mode Register 0
4539          *
4540          * 07..05  PRCTL<2..0>, Protocol Mode, 100=HDLC
4541          * 04      AUTO, Auto-enable (RTS/CTS/DCD)
4542          * 03      Reserved, must be 0
4543          * 02      CRCCC, CRC Calculation, 1=enabled
4544          * 01      CRC1, CRC selection, 0=CRC-16,1=CRC-CCITT-16
4545          * 00      CRC0, CRC initial value, 1 = all 1s
4546          *
4547          * 1000 0001
4548          */
4549         RegValue = 0x81;
4550         if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4551                 RegValue |= BIT4;
4552         if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4553                 RegValue |= BIT4;
4554         if (info->params.crc_type == HDLC_CRC_16_CCITT)
4555                 RegValue |= BIT2 + BIT1;
4556         write_reg(info, MD0, RegValue);
4557 
4558         /* MD1, Mode Register 1
4559          *
4560          * 07..06  ADDRS<1..0>, Address detect, 00=no addr check
4561          * 05..04  TXCHR<1..0>, tx char size, 00=8 bits
4562          * 03..02  RXCHR<1..0>, rx char size, 00=8 bits
4563          * 01..00  PMPM<1..0>, Parity mode, 00=no parity
4564          *
4565          * 0000 0000
4566          */
4567         RegValue = 0x00;
4568         write_reg(info, MD1, RegValue);
4569 
4570         /* MD2, Mode Register 2
4571          *
4572          * 07      NRZFM, 0=NRZ, 1=FM
4573          * 06..05  CODE<1..0> Encoding, 00=NRZ
4574          * 04..03  DRATE<1..0> DPLL Divisor, 00=8
4575          * 02      Reserved, must be 0
4576          * 01..00  CNCT<1..0> Channel connection, 0=normal
4577          *
4578          * 0000 0000
4579          */
4580         RegValue = 0x00;
4581         switch(info->params.encoding) {
4582         case HDLC_ENCODING_NRZI:          RegValue |= BIT5; break;
4583         case HDLC_ENCODING_BIPHASE_MARK:  RegValue |= BIT7 + BIT5; break; /* aka FM1 */
4584         case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT7 + BIT6; break; /* aka FM0 */
4585         case HDLC_ENCODING_BIPHASE_LEVEL: RegValue |= BIT7; break;      /* aka Manchester */
4586 #if 0
4587         case HDLC_ENCODING_NRZB:                                        /* not supported */
4588         case HDLC_ENCODING_NRZI_MARK:                                   /* not supported */
4589         case HDLC_ENCODING_DIFF_BIPHASE_LEVEL:                          /* not supported */
4590 #endif
4591         }
4592         if ( info->params.flags & HDLC_FLAG_DPLL_DIV16 ) {
4593                 DpllDivisor = 16;
4594                 RegValue |= BIT3;
4595         } else if ( info->params.flags & HDLC_FLAG_DPLL_DIV8 ) {
4596                 DpllDivisor = 8;
4597         } else {
4598                 DpllDivisor = 32;
4599                 RegValue |= BIT4;
4600         }
4601         write_reg(info, MD2, RegValue);
4602 
4603 
4604         /* RXS, Receive clock source
4605          *
4606          * 07      Reserved, must be 0
4607          * 06..04  RXCS<2..0>, clock source, 000=RxC Pin, 100=BRG, 110=DPLL
4608          * 03..00  RXBR<3..0>, rate divisor, 0000=1
4609          */
4610         RegValue=0;
4611         if (info->params.flags & HDLC_FLAG_RXC_BRG)
4612                 RegValue |= BIT6;
4613         if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4614                 RegValue |= BIT6 + BIT5;
4615         write_reg(info, RXS, RegValue);
4616 
4617         /* TXS, Transmit clock source
4618          *
4619          * 07      Reserved, must be 0
4620          * 06..04  RXCS<2..0>, clock source, 000=TxC Pin, 100=BRG, 110=Receive Clock
4621          * 03..00  RXBR<3..0>, rate divisor, 0000=1
4622          */
4623         RegValue=0;
4624         if (info->params.flags & HDLC_FLAG_TXC_BRG)
4625                 RegValue |= BIT6;
4626         if (info->params.flags & HDLC_FLAG_TXC_DPLL)
4627                 RegValue |= BIT6 + BIT5;
4628         write_reg(info, TXS, RegValue);
4629 
4630         if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4631                 set_rate(info, info->params.clock_speed * DpllDivisor);
4632         else
4633                 set_rate(info, info->params.clock_speed);
4634 
4635         /* GPDATA (General Purpose I/O Data Register)
4636          *
4637          * 6,4,2,0  CLKSEL<3..0>, 0 = TcCLK in, 1 = Auxclk out
4638          */
4639         if (info->params.flags & HDLC_FLAG_TXC_BRG)
4640                 info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4641         else
4642                 info->port_array[0]->ctrlreg_value &= ~(BIT0 << (info->port_num * 2));
4643         write_control_reg(info);
4644 
4645         /* RRC Receive Ready Control 0
4646          *
4647          * 07..05  Reserved, must be 0
4648          * 04..00  RRC<4..0> Rx FIFO trigger active
4649          */
4650         write_reg(info, RRC, rx_active_fifo_level);
4651 
4652         /* TRC0 Transmit Ready Control 0
4653          *
4654          * 07..05  Reserved, must be 0
4655          * 04..00  TRC<4..0> Tx FIFO trigger active
4656          */
4657         write_reg(info, TRC0, tx_active_fifo_level);
4658 
4659         /* TRC1 Transmit Ready Control 1
4660          *
4661          * 07..05  Reserved, must be 0
4662          * 04..00  TRC<4..0> Tx FIFO trigger inactive 0x1f = 32 bytes (full)
4663          */
4664         write_reg(info, TRC1, (unsigned char)(tx_negate_fifo_level - 1));
4665 
4666         /* DMR, DMA Mode Register
4667          *
4668          * 07..05  Reserved, must be 0
4669          * 04      TMOD, Transfer Mode: 1=chained-block
4670          * 03      Reserved, must be 0
4671          * 02      NF, Number of Frames: 1=multi-frame
4672          * 01      CNTE, Frame End IRQ Counter enable: 0=disabled
4673          * 00      Reserved, must be 0
4674          *
4675          * 0001 0100
4676          */
4677         write_reg(info, TXDMA + DMR, 0x14);
4678         write_reg(info, RXDMA + DMR, 0x14);
4679 
4680         /* Set chain pointer base (upper 8 bits of 24 bit addr) */
4681         write_reg(info, RXDMA + CPB,
4682                 (unsigned char)(info->buffer_list_phys >> 16));
4683 
4684         /* Set chain pointer base (upper 8 bits of 24 bit addr) */
4685         write_reg(info, TXDMA + CPB,
4686                 (unsigned char)(info->buffer_list_phys >> 16));
4687 
4688         /* enable status interrupts. other code enables/disables
4689          * the individual sources for these two interrupt classes.
4690          */
4691         info->ie0_value |= TXINTE + RXINTE;
4692         write_reg(info, IE0, info->ie0_value);
4693 
4694         /* CTL, MSCI control register
4695          *
4696          * 07..06  Reserved, set to 0
4697          * 05      UDRNC, underrun control, 0=abort 1=CRC+flag (HDLC/BSC)
4698          * 04      IDLC, idle control, 0=mark 1=idle register
4699          * 03      BRK, break, 0=off 1 =on (async)
4700          * 02      SYNCLD, sync char load enable (BSC) 1=enabled
4701          * 01      GOP, go active on poll (LOOP mode) 1=enabled
4702          * 00      RTS, RTS output control, 0=active 1=inactive
4703          *
4704          * 0001 0001
4705          */
4706         RegValue = 0x10;
4707         if (!(info->serial_signals & SerialSignal_RTS))
4708                 RegValue |= 0x01;
4709         write_reg(info, CTL, RegValue);
4710 
4711         /* preamble not supported ! */
4712 
4713         tx_set_idle(info);
4714         tx_stop(info);
4715         rx_stop(info);
4716 
4717         set_rate(info, info->params.clock_speed);
4718 
4719         if (info->params.loopback)
4720                 enable_loopback(info,1);
4721 }
4722 
4723 /* Set the transmit HDLC idle mode
4724  */
4725 static void tx_set_idle(SLMP_INFO *info)
4726 {
4727         unsigned char RegValue = 0xff;
4728 
4729         /* Map API idle mode to SCA register bits */
4730         switch(info->idle_mode) {
4731         case HDLC_TXIDLE_FLAGS:                 RegValue = 0x7e; break;
4732         case HDLC_TXIDLE_ALT_ZEROS_ONES:        RegValue = 0xaa; break;
4733         case HDLC_TXIDLE_ZEROS:                 RegValue = 0x00; break;
4734         case HDLC_TXIDLE_ONES:                  RegValue = 0xff; break;
4735         case HDLC_TXIDLE_ALT_MARK_SPACE:        RegValue = 0xaa; break;
4736         case HDLC_TXIDLE_SPACE:                 RegValue = 0x00; break;
4737         case HDLC_TXIDLE_MARK:                  RegValue = 0xff; break;
4738         }
4739 
4740         write_reg(info, IDL, RegValue);
4741 }
4742 
4743 /* Query the adapter for the state of the V24 status (input) signals.
4744  */
4745 static void get_signals(SLMP_INFO *info)
4746 {
4747         u16 status = read_reg(info, SR3);
4748         u16 gpstatus = read_status_reg(info);
4749         u16 testbit;
4750 
4751         /* clear all serial signals except RTS and DTR */
4752         info->serial_signals &= SerialSignal_RTS | SerialSignal_DTR;
4753 
4754         /* set serial signal bits to reflect MISR */
4755 
4756         if (!(status & BIT3))
4757                 info->serial_signals |= SerialSignal_CTS;
4758 
4759         if ( !(status & BIT2))
4760                 info->serial_signals |= SerialSignal_DCD;
4761 
4762         testbit = BIT1 << (info->port_num * 2); // Port 0..3 RI is GPDATA<1,3,5,7>
4763         if (!(gpstatus & testbit))
4764                 info->serial_signals |= SerialSignal_RI;
4765 
4766         testbit = BIT0 << (info->port_num * 2); // Port 0..3 DSR is GPDATA<0,2,4,6>
4767         if (!(gpstatus & testbit))
4768                 info->serial_signals |= SerialSignal_DSR;
4769 }
4770 
4771 /* Set the state of RTS and DTR based on contents of
4772  * serial_signals member of device context.
4773  */
4774 static void set_signals(SLMP_INFO *info)
4775 {
4776         unsigned char RegValue;
4777         u16 EnableBit;
4778 
4779         RegValue = read_reg(info, CTL);
4780         if (info->serial_signals & SerialSignal_RTS)
4781                 RegValue &= ~BIT0;
4782         else
4783                 RegValue |= BIT0;
4784         write_reg(info, CTL, RegValue);
4785 
4786         // Port 0..3 DTR is ctrl reg <1,3,5,7>
4787         EnableBit = BIT1 << (info->port_num*2);
4788         if (info->serial_signals & SerialSignal_DTR)
4789                 info->port_array[0]->ctrlreg_value &= ~EnableBit;
4790         else
4791                 info->port_array[0]->ctrlreg_value |= EnableBit;
4792         write_control_reg(info);
4793 }
4794 
4795 /*******************/
4796 /* DMA Buffer Code */
4797 /*******************/
4798 
4799 /* Set the count for all receive buffers to SCABUFSIZE
4800  * and set the current buffer to the first buffer. This effectively
4801  * makes all buffers free and discards any data in buffers.
4802  */
4803 static void rx_reset_buffers(SLMP_INFO *info)
4804 {
4805         rx_free_frame_buffers(info, 0, info->rx_buf_count - 1);
4806 }
4807 
4808 /* Free the buffers used by a received frame
4809  *
4810  * info   pointer to device instance data
4811  * first  index of 1st receive buffer of frame
4812  * last   index of last receive buffer of frame
4813  */
4814 static void rx_free_frame_buffers(SLMP_INFO *info, unsigned int first, unsigned int last)
4815 {
4816         bool done = false;
4817 
4818         while(!done) {
4819                 /* reset current buffer for reuse */
4820                 info->rx_buf_list[first].status = 0xff;
4821 
4822                 if (first == last) {
4823                         done = true;
4824                         /* set new last rx descriptor address */
4825                         write_reg16(info, RXDMA + EDA, info->rx_buf_list_ex[first].phys_entry);
4826                 }
4827 
4828                 first++;
4829                 if (first == info->rx_buf_count)
4830                         first = 0;
4831         }
4832 
4833         /* set current buffer to next buffer after last buffer of frame */
4834         info->current_rx_buf = first;
4835 }
4836 
4837 /* Return a received frame from the receive DMA buffers.
4838  * Only frames received without errors are returned.
4839  *
4840  * Return Value:        true if frame returned, otherwise false
4841  */
4842 static bool rx_get_frame(SLMP_INFO *info)
4843 {
4844         unsigned int StartIndex, EndIndex;      /* index of 1st and last buffers of Rx frame */
4845         unsigned short status;
4846         unsigned int framesize = 0;
4847         bool ReturnCode = false;
4848         unsigned long flags;
4849         struct tty_struct *tty = info->port.tty;
4850         unsigned char addr_field = 0xff;
4851         SCADESC *desc;
4852         SCADESC_EX *desc_ex;
4853 
4854 CheckAgain:
4855         /* assume no frame returned, set zero length */
4856         framesize = 0;
4857         addr_field = 0xff;
4858 
4859         /*
4860          * current_rx_buf points to the 1st buffer of the next available
4861          * receive frame. To find the last buffer of the frame look for
4862          * a non-zero status field in the buffer entries. (The status
4863          * field is set by the 16C32 after completing a receive frame.
4864          */
4865         StartIndex = EndIndex = info->current_rx_buf;
4866 
4867         for ( ;; ) {
4868                 desc = &info->rx_buf_list[EndIndex];
4869                 desc_ex = &info->rx_buf_list_ex[EndIndex];
4870 
4871                 if (desc->status == 0xff)
4872                         goto Cleanup;   /* current desc still in use, no frames available */
4873 
4874                 if (framesize == 0 && info->params.addr_filter != 0xff)
4875                         addr_field = desc_ex->virt_addr[0];
4876 
4877                 framesize += desc->length;
4878 
4879                 /* Status != 0 means last buffer of frame */
4880                 if (desc->status)
4881                         break;
4882 
4883                 EndIndex++;
4884                 if (EndIndex == info->rx_buf_count)
4885                         EndIndex = 0;
4886 
4887                 if (EndIndex == info->current_rx_buf) {
4888                         /* all buffers have been 'used' but none mark      */
4889                         /* the end of a frame. Reset buffers and receiver. */
4890                         if ( info->rx_enabled ){
4891                                 spin_lock_irqsave(&info->lock,flags);
4892                                 rx_start(info);
4893                                 spin_unlock_irqrestore(&info->lock,flags);
4894                         }
4895                         goto Cleanup;
4896                 }
4897 
4898         }
4899 
4900         /* check status of receive frame */
4901 
4902         /* frame status is byte stored after frame data
4903          *
4904          * 7 EOM (end of msg), 1 = last buffer of frame
4905          * 6 Short Frame, 1 = short frame
4906          * 5 Abort, 1 = frame aborted
4907          * 4 Residue, 1 = last byte is partial
4908          * 3 Overrun, 1 = overrun occurred during frame reception
4909          * 2 CRC,     1 = CRC error detected
4910          *
4911          */
4912         status = desc->status;
4913 
4914         /* ignore CRC bit if not using CRC (bit is undefined) */
4915         /* Note:CRC is not save to data buffer */
4916         if (info->params.crc_type == HDLC_CRC_NONE)
4917                 status &= ~BIT2;
4918 
4919         if (framesize == 0 ||
4920                  (addr_field != 0xff && addr_field != info->params.addr_filter)) {
4921                 /* discard 0 byte frames, this seems to occur sometime
4922                  * when remote is idling flags.
4923                  */
4924                 rx_free_frame_buffers(info, StartIndex, EndIndex);
4925                 goto CheckAgain;
4926         }
4927 
4928         if (framesize < 2)
4929                 status |= BIT6;
4930 
4931         if (status & (BIT6+BIT5+BIT3+BIT2)) {
4932                 /* received frame has errors,
4933                  * update counts and mark frame size as 0
4934                  */
4935                 if (status & BIT6)
4936                         info->icount.rxshort++;
4937                 else if (status & BIT5)
4938                         info->icount.rxabort++;
4939                 else if (status & BIT3)
4940                         info->icount.rxover++;
4941                 else
4942                         info->icount.rxcrc++;
4943 
4944                 framesize = 0;
4945 #if SYNCLINK_GENERIC_HDLC
4946                 {
4947                         info->netdev->stats.rx_errors++;
4948                         info->netdev->stats.rx_frame_errors++;
4949                 }
4950 #endif
4951         }
4952 
4953         if ( debug_level >= DEBUG_LEVEL_BH )
4954                 printk("%s(%d):%s rx_get_frame() status=%04X size=%d\n",
4955                         __FILE__,__LINE__,info->device_name,status,framesize);
4956 
4957         if ( debug_level >= DEBUG_LEVEL_DATA )
4958                 trace_block(info,info->rx_buf_list_ex[StartIndex].virt_addr,
4959                         min_t(unsigned int, framesize, SCABUFSIZE), 0);
4960 
4961         if (framesize) {
4962                 if (framesize > info->max_frame_size)
4963                         info->icount.rxlong++;
4964                 else {
4965                         /* copy dma buffer(s) to contiguous intermediate buffer */
4966                         int copy_count = framesize;
4967                         int index = StartIndex;
4968                         unsigned char *ptmp = info->tmp_rx_buf;
4969                         info->tmp_rx_buf_count = framesize;
4970 
4971                         info->icount.rxok++;
4972 
4973                         while(copy_count) {
4974                                 int partial_count = min(copy_count,SCABUFSIZE);
4975                                 memcpy( ptmp,
4976                                         info->rx_buf_list_ex[index].virt_addr,
4977                                         partial_count );
4978                                 ptmp += partial_count;
4979                                 copy_count -= partial_count;
4980 
4981                                 if ( ++index == info->rx_buf_count )
4982                                         index = 0;
4983                         }
4984 
4985 #if SYNCLINK_GENERIC_HDLC
4986                         if (info->netcount)
4987                                 hdlcdev_rx(info,info->tmp_rx_buf,framesize);
4988                         else
4989 #endif
4990                                 ldisc_receive_buf(tty,info->tmp_rx_buf,
4991                                                   info->flag_buf, framesize);
4992                 }
4993         }
4994         /* Free the buffers used by this frame. */
4995         rx_free_frame_buffers( info, StartIndex, EndIndex );
4996 
4997         ReturnCode = true;
4998 
4999 Cleanup:
5000         if ( info->rx_enabled && info->rx_overflow ) {
5001                 /* Receiver is enabled, but needs to restarted due to
5002                  * rx buffer overflow. If buffers are empty, restart receiver.
5003                  */
5004                 if (info->rx_buf_list[EndIndex].status == 0xff) {
5005                         spin_lock_irqsave(&info->lock,flags);
5006                         rx_start(info);
5007                         spin_unlock_irqrestore(&info->lock,flags);
5008                 }
5009         }
5010 
5011         return ReturnCode;
5012 }
5013 
5014 /* load the transmit DMA buffer with data
5015  */
5016 static void tx_load_dma_buffer(SLMP_INFO *info, const char *buf, unsigned int count)
5017 {
5018         unsigned short copy_count;
5019         unsigned int i = 0;
5020         SCADESC *desc;
5021         SCADESC_EX *desc_ex;
5022 
5023         if ( debug_level >= DEBUG_LEVEL_DATA )
5024                 trace_block(info, buf, min_t(unsigned int, count, SCABUFSIZE), 1);
5025 
5026         /* Copy source buffer to one or more DMA buffers, starting with
5027          * the first transmit dma buffer.
5028          */
5029         for(i=0;;)
5030         {
5031                 copy_count = min_t(unsigned int, count, SCABUFSIZE);
5032 
5033                 desc = &info->tx_buf_list[i];
5034                 desc_ex = &info->tx_buf_list_ex[i];
5035 
5036                 load_pci_memory(info, desc_ex->virt_addr,buf,copy_count);
5037 
5038                 desc->length = copy_count;
5039                 desc->status = 0;
5040 
5041                 buf += copy_count;
5042                 count -= copy_count;
5043 
5044                 if (!count)
5045                         break;
5046 
5047                 i++;
5048                 if (i >= info->tx_buf_count)
5049                         i = 0;
5050         }
5051 
5052         info->tx_buf_list[i].status = 0x81;     /* set EOM and EOT status */
5053         info->last_tx_buf = ++i;
5054 }
5055 
5056 static bool register_test(SLMP_INFO *info)
5057 {
5058         static unsigned char testval[] = {0x00, 0xff, 0xaa, 0x55, 0x69, 0x96};
5059         static unsigned int count = ARRAY_SIZE(testval);
5060         unsigned int i;
5061         bool rc = true;
5062         unsigned long flags;
5063 
5064         spin_lock_irqsave(&info->lock,flags);
5065         reset_port(info);
5066 
5067         /* assume failure */
5068         info->init_error = DiagStatus_AddressFailure;
5069 
5070         /* Write bit patterns to various registers but do it out of */
5071         /* sync, then read back and verify values. */
5072 
5073         for (i = 0 ; i < count ; i++) {
5074                 write_reg(info, TMC, testval[i]);
5075                 write_reg(info, IDL, testval[(i+1)%count]);
5076                 write_reg(info, SA0, testval[(i+2)%count]);
5077                 write_reg(info, SA1, testval[(i+3)%count]);
5078 
5079                 if ( (read_reg(info, TMC) != testval[i]) ||
5080                           (read_reg(info, IDL) != testval[(i+1)%count]) ||
5081                           (read_reg(info, SA0) != testval[(i+2)%count]) ||
5082                           (read_reg(info, SA1) != testval[(i+3)%count]) )
5083                 {
5084                         rc = false;
5085                         break;
5086                 }
5087         }
5088 
5089         reset_port(info);
5090         spin_unlock_irqrestore(&info->lock,flags);
5091 
5092         return rc;
5093 }
5094 
5095 static bool irq_test(SLMP_INFO *info)
5096 {
5097         unsigned long timeout;
5098         unsigned long flags;
5099 
5100         unsigned char timer = (info->port_num & 1) ? TIMER2 : TIMER0;
5101 
5102         spin_lock_irqsave(&info->lock,flags);
5103         reset_port(info);
5104 
5105         /* assume failure */
5106         info->init_error = DiagStatus_IrqFailure;
5107         info->irq_occurred = false;
5108 
5109         /* setup timer0 on SCA0 to interrupt */
5110 
5111         /* IER2<7..4> = timer<3..0> interrupt enables (1=enabled) */
5112         write_reg(info, IER2, (unsigned char)((info->port_num & 1) ? BIT6 : BIT4));
5113 
5114         write_reg(info, (unsigned char)(timer + TEPR), 0);      /* timer expand prescale */
5115         write_reg16(info, (unsigned char)(timer + TCONR), 1);   /* timer constant */
5116 
5117 
5118         /* TMCS, Timer Control/Status Register
5119          *
5120          * 07      CMF, Compare match flag (read only) 1=match
5121          * 06      ECMI, CMF Interrupt Enable: 1=enabled
5122          * 05      Reserved, must be 0
5123          * 04      TME, Timer Enable
5124          * 03..00  Reserved, must be 0
5125          *
5126          * 0101 0000
5127          */
5128         write_reg(info, (unsigned char)(timer + TMCS), 0x50);
5129 
5130         spin_unlock_irqrestore(&info->lock,flags);
5131 
5132         timeout=100;
5133         while( timeout-- && !info->irq_occurred ) {
5134                 msleep_interruptible(10);
5135         }
5136 
5137         spin_lock_irqsave(&info->lock,flags);
5138         reset_port(info);
5139         spin_unlock_irqrestore(&info->lock,flags);
5140 
5141         return info->irq_occurred;
5142 }
5143 
5144 /* initialize individual SCA device (2 ports)
5145  */
5146 static bool sca_init(SLMP_INFO *info)
5147 {
5148         /* set wait controller to single mem partition (low), no wait states */
5149         write_reg(info, PABR0, 0);      /* wait controller addr boundary 0 */
5150         write_reg(info, PABR1, 0);      /* wait controller addr boundary 1 */
5151         write_reg(info, WCRL, 0);       /* wait controller low range */
5152         write_reg(info, WCRM, 0);       /* wait controller mid range */
5153         write_reg(info, WCRH, 0);       /* wait controller high range */
5154 
5155         /* DPCR, DMA Priority Control
5156          *
5157          * 07..05  Not used, must be 0
5158          * 04      BRC, bus release condition: 0=all transfers complete
5159          * 03      CCC, channel change condition: 0=every cycle
5160          * 02..00  PR<2..0>, priority 100=round robin
5161          *
5162          * 00000100 = 0x04
5163          */
5164         write_reg(info, DPCR, dma_priority);
5165 
5166         /* DMA Master Enable, BIT7: 1=enable all channels */
5167         write_reg(info, DMER, 0x80);
5168 
5169         /* enable all interrupt classes */
5170         write_reg(info, IER0, 0xff);    /* TxRDY,RxRDY,TxINT,RxINT (ports 0-1) */
5171         write_reg(info, IER1, 0xff);    /* DMIB,DMIA (channels 0-3) */
5172         write_reg(info, IER2, 0xf0);    /* TIRQ (timers 0-3) */
5173 
5174         /* ITCR, interrupt control register
5175          * 07      IPC, interrupt priority, 0=MSCI->DMA
5176          * 06..05  IAK<1..0>, Acknowledge cycle, 00=non-ack cycle
5177          * 04      VOS, Vector Output, 0=unmodified vector
5178          * 03..00  Reserved, must be 0
5179          */
5180         write_reg(info, ITCR, 0);
5181 
5182         return true;
5183 }
5184 
5185 /* initialize adapter hardware
5186  */
5187 static bool init_adapter(SLMP_INFO *info)
5188 {
5189         int i;
5190 
5191         /* Set BIT30 of Local Control Reg 0x50 to reset SCA */
5192         volatile u32 *MiscCtrl = (u32 *)(info->lcr_base + 0x50);
5193         u32 readval;
5194 
5195         info->misc_ctrl_value |= BIT30;
5196         *MiscCtrl = info->misc_ctrl_value;
5197 
5198         /*
5199          * Force at least 170ns delay before clearing
5200          * reset bit. Each read from LCR takes at least
5201          * 30ns so 10 times for 300ns to be safe.
5202          */
5203         for(i=0;i<10;i++)
5204                 readval = *MiscCtrl;
5205 
5206         info->misc_ctrl_value &= ~BIT30;
5207         *MiscCtrl = info->misc_ctrl_value;
5208 
5209         /* init control reg (all DTRs off, all clksel=input) */
5210         info->ctrlreg_value = 0xaa;
5211         write_control_reg(info);
5212 
5213         {
5214                 volatile u32 *LCR1BRDR = (u32 *)(info->lcr_base + 0x2c);
5215                 lcr1_brdr_value &= ~(BIT5 + BIT4 + BIT3);
5216 
5217                 switch(read_ahead_count)
5218                 {
5219                 case 16:
5220                         lcr1_brdr_value |= BIT5 + BIT4 + BIT3;
5221                         break;
5222                 case 8:
5223                         lcr1_brdr_value |= BIT5 + BIT4;
5224                         break;
5225                 case 4:
5226                         lcr1_brdr_value |= BIT5 + BIT3;
5227                         break;
5228                 case 0:
5229                         lcr1_brdr_value |= BIT5;
5230                         break;
5231                 }
5232 
5233                 *LCR1BRDR = lcr1_brdr_value;
5234                 *MiscCtrl = misc_ctrl_value;
5235         }
5236 
5237         sca_init(info->port_array[0]);
5238         sca_init(info->port_array[2]);
5239 
5240         return true;
5241 }
5242 
5243 /* Loopback an HDLC frame to test the hardware
5244  * interrupt and DMA functions.
5245  */
5246 static bool loopback_test(SLMP_INFO *info)
5247 {
5248 #define TESTFRAMESIZE 20
5249 
5250         unsigned long timeout;
5251         u16 count = TESTFRAMESIZE;
5252         unsigned char buf[TESTFRAMESIZE];
5253         bool rc = false;
5254         unsigned long flags;
5255 
5256         struct tty_struct *oldtty = info->port.tty;
5257         u32 speed = info->params.clock_speed;
5258 
5259         info->params.clock_speed = 3686400;
5260         info->port.tty = NULL;
5261 
5262         /* assume failure */
5263         info->init_error = DiagStatus_DmaFailure;
5264 
5265         /* build and send transmit frame */
5266         for (count = 0; count < TESTFRAMESIZE;++count)
5267                 buf[count] = (unsigned char)count;
5268 
5269         memset(info->tmp_rx_buf,0,TESTFRAMESIZE);
5270 
5271         /* program hardware for HDLC and enabled receiver */
5272         spin_lock_irqsave(&info->lock,flags);
5273         hdlc_mode(info);
5274         enable_loopback(info,1);
5275         rx_start(info);
5276         info->tx_count = count;
5277         tx_load_dma_buffer(info,buf,count);
5278         tx_start(info);
5279         spin_unlock_irqrestore(&info->lock,flags);
5280 
5281         /* wait for receive complete */
5282         /* Set a timeout for waiting for interrupt. */
5283         for ( timeout = 100; timeout; --timeout ) {
5284                 msleep_interruptible(10);
5285 
5286                 if (rx_get_frame(info)) {
5287                         rc = true;
5288                         break;
5289                 }
5290         }
5291 
5292         /* verify received frame length and contents */
5293         if (rc &&
5294             ( info->tmp_rx_buf_count != count ||
5295               memcmp(buf, info->tmp_rx_buf,count))) {
5296                 rc = false;
5297         }
5298 
5299         spin_lock_irqsave(&info->lock,flags);
5300         reset_adapter(info);
5301         spin_unlock_irqrestore(&info->lock,flags);
5302 
5303         info->params.clock_speed = speed;
5304         info->port.tty = oldtty;
5305 
5306         return rc;
5307 }
5308 
5309 /* Perform diagnostics on hardware
5310  */
5311 static int adapter_test( SLMP_INFO *info )
5312 {
5313         unsigned long flags;
5314         if ( debug_level >= DEBUG_LEVEL_INFO )
5315                 printk( "%s(%d):Testing device %s\n",
5316                         __FILE__,__LINE__,info->device_name );
5317 
5318         spin_lock_irqsave(&info->lock,flags);
5319         init_adapter(info);
5320         spin_unlock_irqrestore(&info->lock,flags);
5321 
5322         info->port_array[0]->port_count = 0;
5323 
5324         if ( register_test(info->port_array[0]) &&
5325                 register_test(info->port_array[1])) {
5326 
5327                 info->port_array[0]->port_count = 2;
5328 
5329                 if ( register_test(info->port_array[2]) &&
5330                         register_test(info->port_array[3]) )
5331                         info->port_array[0]->port_count += 2;
5332         }
5333         else {
5334                 printk( "%s(%d):Register test failure for device %s Addr=%08lX\n",
5335                         __FILE__,__LINE__,info->device_name, (unsigned long)(info->phys_sca_base));
5336                 return -ENODEV;
5337         }
5338 
5339         if ( !irq_test(info->port_array[0]) ||
5340                 !irq_test(info->port_array[1]) ||
5341                  (info->port_count == 4 && !irq_test(info->port_array[2])) ||
5342                  (info->port_count == 4 && !irq_test(info->port_array[3]))) {
5343                 printk( "%s(%d):Interrupt test failure for device %s IRQ=%d\n",
5344                         __FILE__,__LINE__,info->device_name, (unsigned short)(info->irq_level) );
5345                 return -ENODEV;
5346         }
5347 
5348         if (!loopback_test(info->port_array[0]) ||
5349                 !loopback_test(info->port_array[1]) ||
5350                  (info->port_count == 4 && !loopback_test(info->port_array[2])) ||
5351                  (info->port_count == 4 && !loopback_test(info->port_array[3]))) {
5352                 printk( "%s(%d):DMA test failure for device %s\n",
5353                         __FILE__,__LINE__,info->device_name);
5354                 return -ENODEV;
5355         }
5356 
5357         if ( debug_level >= DEBUG_LEVEL_INFO )
5358                 printk( "%s(%d):device %s passed diagnostics\n",
5359                         __FILE__,__LINE__,info->device_name );
5360 
5361         info->port_array[0]->init_error = 0;
5362         info->port_array[1]->init_error = 0;
5363         if ( info->port_count > 2 ) {
5364                 info->port_array[2]->init_error = 0;
5365                 info->port_array[3]->init_error = 0;
5366         }
5367 
5368         return 0;
5369 }
5370 
5371 /* Test the shared memory on a PCI adapter.
5372  */
5373 static bool memory_test(SLMP_INFO *info)
5374 {
5375         static unsigned long testval[] = { 0x0, 0x55555555, 0xaaaaaaaa,
5376                 0x66666666, 0x99999999, 0xffffffff, 0x12345678 };
5377         unsigned long count = ARRAY_SIZE(testval);
5378         unsigned long i;
5379         unsigned long limit = SCA_MEM_SIZE/sizeof(unsigned long);
5380         unsigned long * addr = (unsigned long *)info->memory_base;
5381 
5382         /* Test data lines with test pattern at one location. */
5383 
5384         for ( i = 0 ; i < count ; i++ ) {
5385                 *addr = testval[i];
5386                 if ( *addr != testval[i] )
5387                         return false;
5388         }
5389 
5390         /* Test address lines with incrementing pattern over */
5391         /* entire address range. */
5392 
5393         for ( i = 0 ; i < limit ; i++ ) {
5394                 *addr = i * 4;
5395                 addr++;
5396         }
5397 
5398         addr = (unsigned long *)info->memory_base;
5399 
5400         for ( i = 0 ; i < limit ; i++ ) {
5401                 if ( *addr != i * 4 )
5402                         return false;
5403                 addr++;
5404         }
5405 
5406         memset( info->memory_base, 0, SCA_MEM_SIZE );
5407         return true;
5408 }
5409 
5410 /* Load data into PCI adapter shared memory.
5411  *
5412  * The PCI9050 releases control of the local bus
5413  * after completing the current read or write operation.
5414  *
5415  * While the PCI9050 write FIFO not empty, the
5416  * PCI9050 treats all of the writes as a single transaction
5417  * and does not release the bus. This causes DMA latency problems
5418  * at high speeds when copying large data blocks to the shared memory.
5419  *
5420  * This function breaks a write into multiple transations by
5421  * interleaving a read which flushes the write FIFO and 'completes'
5422  * the write transation. This allows any pending DMA request to gain control
5423  * of the local bus in a timely fasion.
5424  */
5425 static void load_pci_memory(SLMP_INFO *info, char* dest, const char* src, unsigned short count)
5426 {
5427         /* A load interval of 16 allows for 4 32-bit writes at */
5428         /* 136ns each for a maximum latency of 542ns on the local bus.*/
5429 
5430         unsigned short interval = count / sca_pci_load_interval;
5431         unsigned short i;
5432 
5433         for ( i = 0 ; i < interval ; i++ )
5434         {
5435                 memcpy(dest, src, sca_pci_load_interval);
5436                 read_status_reg(info);
5437                 dest += sca_pci_load_interval;
5438                 src += sca_pci_load_interval;
5439         }
5440 
5441         memcpy(dest, src, count % sca_pci_load_interval);
5442 }
5443 
5444 static void trace_block(SLMP_INFO *info,const char* data, int count, int xmit)
5445 {
5446         int i;
5447         int linecount;
5448         if (xmit)
5449                 printk("%s tx data:\n",info->device_name);
5450         else
5451                 printk("%s rx data:\n",info->device_name);
5452 
5453         while(count) {
5454                 if (count > 16)
5455                         linecount = 16;
5456                 else
5457                         linecount = count;
5458 
5459                 for(i=0;i<linecount;i++)
5460                         printk("%02X ",(unsigned char)data[i]);
5461                 for(;i<17;i++)
5462                         printk("   ");
5463                 for(i=0;i<linecount;i++) {
5464                         if (data[i]>=040 && data[i]<=0176)
5465                                 printk("%c",data[i]);
5466                         else
5467                                 printk(".");
5468                 }
5469                 printk("\n");
5470 
5471                 data  += linecount;
5472                 count -= linecount;
5473         }
5474 }       /* end of trace_block() */
5475 
5476 /* called when HDLC frame times out
5477  * update stats and do tx completion processing
5478  */
5479 static void tx_timeout(unsigned long context)
5480 {
5481         SLMP_INFO *info = (SLMP_INFO*)context;
5482         unsigned long flags;
5483 
5484         if ( debug_level >= DEBUG_LEVEL_INFO )
5485                 printk( "%s(%d):%s tx_timeout()\n",
5486                         __FILE__,__LINE__,info->device_name);
5487         if(info->tx_active && info->params.mode == MGSL_MODE_HDLC) {
5488                 info->icount.txtimeout++;
5489         }
5490         spin_lock_irqsave(&info->lock,flags);
5491         info->tx_active = false;
5492         info->tx_count = info->tx_put = info->tx_get = 0;
5493 
5494         spin_unlock_irqrestore(&info->lock,flags);
5495 
5496 #if SYNCLINK_GENERIC_HDLC
5497         if (info->netcount)
5498                 hdlcdev_tx_done(info);
5499         else
5500 #endif
5501                 bh_transmit(info);
5502 }
5503 
5504 /* called to periodically check the DSR/RI modem signal input status
5505  */
5506 static void status_timeout(unsigned long context)
5507 {
5508         u16 status = 0;
5509         SLMP_INFO *info = (SLMP_INFO*)context;
5510         unsigned long flags;
5511         unsigned char delta;
5512 
5513 
5514         spin_lock_irqsave(&info->lock,flags);
5515         get_signals(info);
5516         spin_unlock_irqrestore(&info->lock,flags);
5517 
5518         /* check for DSR/RI state change */
5519 
5520         delta = info->old_signals ^ info->serial_signals;
5521         info->old_signals = info->serial_signals;
5522 
5523         if (delta & SerialSignal_DSR)
5524                 status |= MISCSTATUS_DSR_LATCHED|(info->serial_signals&SerialSignal_DSR);
5525 
5526         if (delta & SerialSignal_RI)
5527                 status |= MISCSTATUS_RI_LATCHED|(info->serial_signals&SerialSignal_RI);
5528 
5529         if (delta & SerialSignal_DCD)
5530                 status |= MISCSTATUS_DCD_LATCHED|(info->serial_signals&SerialSignal_DCD);
5531 
5532         if (delta & SerialSignal_CTS)
5533                 status |= MISCSTATUS_CTS_LATCHED|(info->serial_signals&SerialSignal_CTS);
5534 
5535         if (status)
5536                 isr_io_pin(info,status);
5537 
5538         mod_timer(&info->status_timer, jiffies + msecs_to_jiffies(10));
5539 }
5540 
5541 
5542 /* Register Access Routines -
5543  * All registers are memory mapped
5544  */
5545 #define CALC_REGADDR() \
5546         unsigned char * RegAddr = (unsigned char*)(info->sca_base + Addr); \
5547         if (info->port_num > 1) \
5548                 RegAddr += 256;                 /* port 0-1 SCA0, 2-3 SCA1 */ \
5549         if ( info->port_num & 1) { \
5550                 if (Addr > 0x7f) \
5551                         RegAddr += 0x40;        /* DMA access */ \
5552                 else if (Addr > 0x1f && Addr < 0x60) \
5553                         RegAddr += 0x20;        /* MSCI access */ \
5554         }
5555 
5556 
5557 static unsigned char read_reg(SLMP_INFO * info, unsigned char Addr)
5558 {
5559         CALC_REGADDR();
5560         return *RegAddr;
5561 }
5562 static void write_reg(SLMP_INFO * info, unsigned char Addr, unsigned char Value)
5563 {
5564         CALC_REGADDR();
5565         *RegAddr = Value;
5566 }
5567 
5568 static u16 read_reg16(SLMP_INFO * info, unsigned char Addr)
5569 {
5570         CALC_REGADDR();
5571         return *((u16 *)RegAddr);
5572 }
5573 
5574 static void write_reg16(SLMP_INFO * info, unsigned char Addr, u16 Value)
5575 {
5576         CALC_REGADDR();
5577         *((u16 *)RegAddr) = Value;
5578 }
5579 
5580 static unsigned char read_status_reg(SLMP_INFO * info)
5581 {
5582         unsigned char *RegAddr = (unsigned char *)info->statctrl_base;
5583         return *RegAddr;
5584 }
5585 
5586 static void write_control_reg(SLMP_INFO * info)
5587 {
5588         unsigned char *RegAddr = (unsigned char *)info->statctrl_base;
5589         *RegAddr = info->port_array[0]->ctrlreg_value;
5590 }
5591 
5592 
5593 static int synclinkmp_init_one (struct pci_dev *dev,
5594                                           const struct pci_device_id *ent)
5595 {
5596         if (pci_enable_device(dev)) {
5597                 printk("error enabling pci device %p\n", dev);
5598                 return -EIO;
5599         }
5600         return device_init( ++synclinkmp_adapter_count, dev );
5601 }
5602 
5603 static void synclinkmp_remove_one (struct pci_dev *dev)
5604 {
5605 }
5606 

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