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/char/pcmcia/synclink_cs.c

  1 /*
  2  * linux/drivers/char/pcmcia/synclink_cs.c
  3  *
  4  * $Id: synclink_cs.c,v 4.34 2005/09/08 13:20:54 paulkf Exp $
  5  *
  6  * Device driver for Microgate SyncLink PC Card
  7  * multiprotocol serial adapter.
  8  *
  9  * written by Paul Fulghum for Microgate Corporation
 10  * paulkf@microgate.com
 11  *
 12  * Microgate and SyncLink are trademarks of Microgate Corporation
 13  *
 14  * This code is released under the GNU General Public License (GPL)
 15  *
 16  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
 17  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 19  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
 20  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 21  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 22  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 24  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 26  * OF THE POSSIBILITY OF SUCH DAMAGE.
 27  */
 28 
 29 #define VERSION(ver,rel,seq) (((ver)<<16) | ((rel)<<8) | (seq))
 30 #if defined(__i386__)
 31 #  define BREAKPOINT() asm("   int $3");
 32 #else
 33 #  define BREAKPOINT() { }
 34 #endif
 35 
 36 #define MAX_DEVICE_COUNT 4
 37 
 38 #include <linux/module.h>
 39 #include <linux/errno.h>
 40 #include <linux/signal.h>
 41 #include <linux/sched.h>
 42 #include <linux/timer.h>
 43 #include <linux/time.h>
 44 #include <linux/interrupt.h>
 45 #include <linux/tty.h>
 46 #include <linux/tty_flip.h>
 47 #include <linux/serial.h>
 48 #include <linux/major.h>
 49 #include <linux/string.h>
 50 #include <linux/fcntl.h>
 51 #include <linux/ptrace.h>
 52 #include <linux/ioport.h>
 53 #include <linux/mm.h>
 54 #include <linux/seq_file.h>
 55 #include <linux/slab.h>
 56 #include <linux/netdevice.h>
 57 #include <linux/vmalloc.h>
 58 #include <linux/init.h>
 59 #include <linux/delay.h>
 60 #include <linux/ioctl.h>
 61 #include <linux/synclink.h>
 62 
 63 #include <asm/io.h>
 64 #include <asm/irq.h>
 65 #include <asm/dma.h>
 66 #include <linux/bitops.h>
 67 #include <asm/types.h>
 68 #include <linux/termios.h>
 69 #include <linux/workqueue.h>
 70 #include <linux/hdlc.h>
 71 
 72 #include <pcmcia/cistpl.h>
 73 #include <pcmcia/cisreg.h>
 74 #include <pcmcia/ds.h>
 75 
 76 #if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINK_CS_MODULE))
 77 #define SYNCLINK_GENERIC_HDLC 1
 78 #else
 79 #define SYNCLINK_GENERIC_HDLC 0
 80 #endif
 81 
 82 #define GET_USER(error,value,addr) error = get_user(value,addr)
 83 #define COPY_FROM_USER(error,dest,src,size) error = copy_from_user(dest,src,size) ? -EFAULT : 0
 84 #define PUT_USER(error,value,addr) error = put_user(value,addr)
 85 #define COPY_TO_USER(error,dest,src,size) error = copy_to_user(dest,src,size) ? -EFAULT : 0
 86 
 87 #include <asm/uaccess.h>
 88 
 89 static MGSL_PARAMS default_params = {
 90         MGSL_MODE_HDLC,                 /* unsigned long mode */
 91         0,                              /* unsigned char loopback; */
 92         HDLC_FLAG_UNDERRUN_ABORT15,     /* unsigned short flags; */
 93         HDLC_ENCODING_NRZI_SPACE,       /* unsigned char encoding; */
 94         0,                              /* unsigned long clock_speed; */
 95         0xff,                           /* unsigned char addr_filter; */
 96         HDLC_CRC_16_CCITT,              /* unsigned short crc_type; */
 97         HDLC_PREAMBLE_LENGTH_8BITS,     /* unsigned char preamble_length; */
 98         HDLC_PREAMBLE_PATTERN_NONE,     /* unsigned char preamble; */
 99         9600,                           /* unsigned long data_rate; */
100         8,                              /* unsigned char data_bits; */
101         1,                              /* unsigned char stop_bits; */
102         ASYNC_PARITY_NONE               /* unsigned char parity; */
103 };
104 
105 typedef struct {
106         int count;
107         unsigned char status;
108         char data[1];
109 } RXBUF;
110 
111 /* The queue of BH actions to be performed */
112 
113 #define BH_RECEIVE  1
114 #define BH_TRANSMIT 2
115 #define BH_STATUS   4
116 
117 #define IO_PIN_SHUTDOWN_LIMIT 100
118 
119 #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
120 
121 struct _input_signal_events {
122         int     ri_up;
123         int     ri_down;
124         int     dsr_up;
125         int     dsr_down;
126         int     dcd_up;
127         int     dcd_down;
128         int     cts_up;
129         int     cts_down;
130 };
131 
132 
133 /*
134  * Device instance data structure
135  */
136 
137 typedef struct _mgslpc_info {
138         struct tty_port         port;
139         void *if_ptr;   /* General purpose pointer (used by SPPP) */
140         int                     magic;
141         int                     line;
142 
143         struct mgsl_icount      icount;
144 
145         int                     timeout;
146         int                     x_char;         /* xon/xoff character */
147         unsigned char           read_status_mask;
148         unsigned char           ignore_status_mask;
149 
150         unsigned char *tx_buf;
151         int            tx_put;
152         int            tx_get;
153         int            tx_count;
154 
155         /* circular list of fixed length rx buffers */
156 
157         unsigned char  *rx_buf;        /* memory allocated for all rx buffers */
158         int            rx_buf_total_size; /* size of memory allocated for rx buffers */
159         int            rx_put;         /* index of next empty rx buffer */
160         int            rx_get;         /* index of next full rx buffer */
161         int            rx_buf_size;    /* size in bytes of single rx buffer */
162         int            rx_buf_count;   /* total number of rx buffers */
163         int            rx_frame_count; /* number of full rx buffers */
164 
165         wait_queue_head_t       status_event_wait_q;
166         wait_queue_head_t       event_wait_q;
167         struct timer_list       tx_timer;       /* HDLC transmit timeout timer */
168         struct _mgslpc_info     *next_device;   /* device list link */
169 
170         unsigned short imra_value;
171         unsigned short imrb_value;
172         unsigned char  pim_value;
173 
174         spinlock_t lock;
175         struct work_struct task;                /* task structure for scheduling bh */
176 
177         u32 max_frame_size;
178 
179         u32 pending_bh;
180 
181         bool bh_running;
182         bool bh_requested;
183 
184         int dcd_chkcount; /* check counts to prevent */
185         int cts_chkcount; /* too many IRQs if a signal */
186         int dsr_chkcount; /* is floating */
187         int ri_chkcount;
188 
189         bool rx_enabled;
190         bool rx_overflow;
191 
192         bool tx_enabled;
193         bool tx_active;
194         bool tx_aborting;
195         u32 idle_mode;
196 
197         int if_mode; /* serial interface selection (RS-232, v.35 etc) */
198 
199         char device_name[25];           /* device instance name */
200 
201         unsigned int io_base;   /* base I/O address of adapter */
202         unsigned int irq_level;
203 
204         MGSL_PARAMS params;             /* communications parameters */
205 
206         unsigned char serial_signals;   /* current serial signal states */
207 
208         bool irq_occurred;              /* for diagnostics use */
209         char testing_irq;
210         unsigned int init_error;        /* startup error (DIAGS)        */
211 
212         char *flag_buf;
213         bool drop_rts_on_tx_done;
214 
215         struct  _input_signal_events    input_signal_events;
216 
217         /* PCMCIA support */
218         struct pcmcia_device    *p_dev;
219         int                   stop;
220 
221         /* SPPP/Cisco HDLC device parts */
222         int netcount;
223         spinlock_t netlock;
224 
225 #if SYNCLINK_GENERIC_HDLC
226         struct net_device *netdev;
227 #endif
228 
229 } MGSLPC_INFO;
230 
231 #define MGSLPC_MAGIC 0x5402
232 
233 /*
234  * The size of the serial xmit buffer is 1 page, or 4096 bytes
235  */
236 #define TXBUFSIZE 4096
237 
238 
239 #define CHA     0x00   /* channel A offset */
240 #define CHB     0x40   /* channel B offset */
241 
242 /*
243  *  FIXME: PPC has PVR defined in asm/reg.h.  For now we just undef it.
244  */
245 #undef PVR
246 
247 #define RXFIFO  0
248 #define TXFIFO  0
249 #define STAR    0x20
250 #define CMDR    0x20
251 #define RSTA    0x21
252 #define PRE     0x21
253 #define MODE    0x22
254 #define TIMR    0x23
255 #define XAD1    0x24
256 #define XAD2    0x25
257 #define RAH1    0x26
258 #define RAH2    0x27
259 #define DAFO    0x27
260 #define RAL1    0x28
261 #define RFC     0x28
262 #define RHCR    0x29
263 #define RAL2    0x29
264 #define RBCL    0x2a
265 #define XBCL    0x2a
266 #define RBCH    0x2b
267 #define XBCH    0x2b
268 #define CCR0    0x2c
269 #define CCR1    0x2d
270 #define CCR2    0x2e
271 #define CCR3    0x2f
272 #define VSTR    0x34
273 #define BGR     0x34
274 #define RLCR    0x35
275 #define AML     0x36
276 #define AMH     0x37
277 #define GIS     0x38
278 #define IVA     0x38
279 #define IPC     0x39
280 #define ISR     0x3a
281 #define IMR     0x3a
282 #define PVR     0x3c
283 #define PIS     0x3d
284 #define PIM     0x3d
285 #define PCR     0x3e
286 #define CCR4    0x3f
287 
288 // IMR/ISR
289 
290 #define IRQ_BREAK_ON    BIT15   // rx break detected
291 #define IRQ_DATAOVERRUN BIT14   // receive data overflow
292 #define IRQ_ALLSENT     BIT13   // all sent
293 #define IRQ_UNDERRUN    BIT12   // transmit data underrun
294 #define IRQ_TIMER       BIT11   // timer interrupt
295 #define IRQ_CTS         BIT10   // CTS status change
296 #define IRQ_TXREPEAT    BIT9    // tx message repeat
297 #define IRQ_TXFIFO      BIT8    // transmit pool ready
298 #define IRQ_RXEOM       BIT7    // receive message end
299 #define IRQ_EXITHUNT    BIT6    // receive frame start
300 #define IRQ_RXTIME      BIT6    // rx char timeout
301 #define IRQ_DCD         BIT2    // carrier detect status change
302 #define IRQ_OVERRUN     BIT1    // receive frame overflow
303 #define IRQ_RXFIFO      BIT0    // receive pool full
304 
305 // STAR
306 
307 #define XFW   BIT6              // transmit FIFO write enable
308 #define CEC   BIT2              // command executing
309 #define CTS   BIT1              // CTS state
310 
311 #define PVR_DTR      BIT0
312 #define PVR_DSR      BIT1
313 #define PVR_RI       BIT2
314 #define PVR_AUTOCTS  BIT3
315 #define PVR_RS232    0x20   /* 0010b */
316 #define PVR_V35      0xe0   /* 1110b */
317 #define PVR_RS422    0x40   /* 0100b */
318 
319 /* Register access functions */
320 
321 #define write_reg(info, reg, val) outb((val),(info)->io_base + (reg))
322 #define read_reg(info, reg) inb((info)->io_base + (reg))
323 
324 #define read_reg16(info, reg) inw((info)->io_base + (reg))
325 #define write_reg16(info, reg, val) outw((val), (info)->io_base + (reg))
326 
327 #define set_reg_bits(info, reg, mask) \
328         write_reg(info, (reg), \
329                  (unsigned char) (read_reg(info, (reg)) | (mask)))
330 #define clear_reg_bits(info, reg, mask) \
331         write_reg(info, (reg), \
332                  (unsigned char) (read_reg(info, (reg)) & ~(mask)))
333 /*
334  * interrupt enable/disable routines
335  */
336 static void irq_disable(MGSLPC_INFO *info, unsigned char channel, unsigned short mask)
337 {
338         if (channel == CHA) {
339                 info->imra_value |= mask;
340                 write_reg16(info, CHA + IMR, info->imra_value);
341         } else {
342                 info->imrb_value |= mask;
343                 write_reg16(info, CHB + IMR, info->imrb_value);
344         }
345 }
346 static void irq_enable(MGSLPC_INFO *info, unsigned char channel, unsigned short mask)
347 {
348         if (channel == CHA) {
349                 info->imra_value &= ~mask;
350                 write_reg16(info, CHA + IMR, info->imra_value);
351         } else {
352                 info->imrb_value &= ~mask;
353                 write_reg16(info, CHB + IMR, info->imrb_value);
354         }
355 }
356 
357 #define port_irq_disable(info, mask) \
358         { info->pim_value |= (mask); write_reg(info, PIM, info->pim_value); }
359 
360 #define port_irq_enable(info, mask) \
361         { info->pim_value &= ~(mask); write_reg(info, PIM, info->pim_value); }
362 
363 static void rx_start(MGSLPC_INFO *info);
364 static void rx_stop(MGSLPC_INFO *info);
365 
366 static void tx_start(MGSLPC_INFO *info, struct tty_struct *tty);
367 static void tx_stop(MGSLPC_INFO *info);
368 static void tx_set_idle(MGSLPC_INFO *info);
369 
370 static void get_signals(MGSLPC_INFO *info);
371 static void set_signals(MGSLPC_INFO *info);
372 
373 static void reset_device(MGSLPC_INFO *info);
374 
375 static void hdlc_mode(MGSLPC_INFO *info);
376 static void async_mode(MGSLPC_INFO *info);
377 
378 static void tx_timeout(unsigned long context);
379 
380 static int carrier_raised(struct tty_port *port);
381 static void dtr_rts(struct tty_port *port, int onoff);
382 
383 #if SYNCLINK_GENERIC_HDLC
384 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
385 static void hdlcdev_tx_done(MGSLPC_INFO *info);
386 static void hdlcdev_rx(MGSLPC_INFO *info, char *buf, int size);
387 static int  hdlcdev_init(MGSLPC_INFO *info);
388 static void hdlcdev_exit(MGSLPC_INFO *info);
389 #endif
390 
391 static void trace_block(MGSLPC_INFO *info,const char* data, int count, int xmit);
392 
393 static bool register_test(MGSLPC_INFO *info);
394 static bool irq_test(MGSLPC_INFO *info);
395 static int adapter_test(MGSLPC_INFO *info);
396 
397 static int claim_resources(MGSLPC_INFO *info);
398 static void release_resources(MGSLPC_INFO *info);
399 static int mgslpc_add_device(MGSLPC_INFO *info);
400 static void mgslpc_remove_device(MGSLPC_INFO *info);
401 
402 static bool rx_get_frame(MGSLPC_INFO *info, struct tty_struct *tty);
403 static void rx_reset_buffers(MGSLPC_INFO *info);
404 static int  rx_alloc_buffers(MGSLPC_INFO *info);
405 static void rx_free_buffers(MGSLPC_INFO *info);
406 
407 static irqreturn_t mgslpc_isr(int irq, void *dev_id);
408 
409 /*
410  * Bottom half interrupt handlers
411  */
412 static void bh_handler(struct work_struct *work);
413 static void bh_transmit(MGSLPC_INFO *info, struct tty_struct *tty);
414 static void bh_status(MGSLPC_INFO *info);
415 
416 /*
417  * ioctl handlers
418  */
419 static int tiocmget(struct tty_struct *tty);
420 static int tiocmset(struct tty_struct *tty,
421                                         unsigned int set, unsigned int clear);
422 static int get_stats(MGSLPC_INFO *info, struct mgsl_icount __user *user_icount);
423 static int get_params(MGSLPC_INFO *info, MGSL_PARAMS __user *user_params);
424 static int set_params(MGSLPC_INFO *info, MGSL_PARAMS __user *new_params, struct tty_struct *tty);
425 static int get_txidle(MGSLPC_INFO *info, int __user *idle_mode);
426 static int set_txidle(MGSLPC_INFO *info, int idle_mode);
427 static int set_txenable(MGSLPC_INFO *info, int enable, struct tty_struct *tty);
428 static int tx_abort(MGSLPC_INFO *info);
429 static int set_rxenable(MGSLPC_INFO *info, int enable);
430 static int wait_events(MGSLPC_INFO *info, int __user *mask);
431 
432 static MGSLPC_INFO *mgslpc_device_list = NULL;
433 static int mgslpc_device_count = 0;
434 
435 /*
436  * Set this param to non-zero to load eax with the
437  * .text section address and breakpoint on module load.
438  * This is useful for use with gdb and add-symbol-file command.
439  */
440 static bool break_on_load;
441 
442 /*
443  * Driver major number, defaults to zero to get auto
444  * assigned major number. May be forced as module parameter.
445  */
446 static int ttymajor=0;
447 
448 static int debug_level = 0;
449 static int maxframe[MAX_DEVICE_COUNT] = {0,};
450 
451 module_param(break_on_load, bool, 0);
452 module_param(ttymajor, int, 0);
453 module_param(debug_level, int, 0);
454 module_param_array(maxframe, int, NULL, 0);
455 
456 MODULE_LICENSE("GPL");
457 
458 static char *driver_name = "SyncLink PC Card driver";
459 static char *driver_version = "$Revision: 4.34 $";
460 
461 static struct tty_driver *serial_driver;
462 
463 /* number of characters left in xmit buffer before we ask for more */
464 #define WAKEUP_CHARS 256
465 
466 static void mgslpc_change_params(MGSLPC_INFO *info, struct tty_struct *tty);
467 static void mgslpc_wait_until_sent(struct tty_struct *tty, int timeout);
468 
469 /* PCMCIA prototypes */
470 
471 static int mgslpc_config(struct pcmcia_device *link);
472 static void mgslpc_release(u_long arg);
473 static void mgslpc_detach(struct pcmcia_device *p_dev);
474 
475 /*
476  * 1st function defined in .text section. Calling this function in
477  * init_module() followed by a breakpoint allows a remote debugger
478  * (gdb) to get the .text address for the add-symbol-file command.
479  * This allows remote debugging of dynamically loadable modules.
480  */
481 static void* mgslpc_get_text_ptr(void)
482 {
483         return mgslpc_get_text_ptr;
484 }
485 
486 /**
487  * line discipline callback wrappers
488  *
489  * The wrappers maintain line discipline references
490  * while calling into the line discipline.
491  *
492  * ldisc_receive_buf  - pass receive data to line discipline
493  */
494 
495 static void ldisc_receive_buf(struct tty_struct *tty,
496                               const __u8 *data, char *flags, int count)
497 {
498         struct tty_ldisc *ld;
499         if (!tty)
500                 return;
501         ld = tty_ldisc_ref(tty);
502         if (ld) {
503                 if (ld->ops->receive_buf)
504                         ld->ops->receive_buf(tty, data, flags, count);
505                 tty_ldisc_deref(ld);
506         }
507 }
508 
509 static const struct tty_port_operations mgslpc_port_ops = {
510         .carrier_raised = carrier_raised,
511         .dtr_rts = dtr_rts
512 };
513 
514 static int mgslpc_probe(struct pcmcia_device *link)
515 {
516         MGSLPC_INFO *info;
517         int ret;
518 
519         if (debug_level >= DEBUG_LEVEL_INFO)
520                 printk("mgslpc_attach\n");
521 
522         info = kzalloc(sizeof(MGSLPC_INFO), GFP_KERNEL);
523         if (!info) {
524                 printk("Error can't allocate device instance data\n");
525                 return -ENOMEM;
526         }
527 
528         info->magic = MGSLPC_MAGIC;
529         tty_port_init(&info->port);
530         info->port.ops = &mgslpc_port_ops;
531         INIT_WORK(&info->task, bh_handler);
532         info->max_frame_size = 4096;
533         info->port.close_delay = 5*HZ/10;
534         info->port.closing_wait = 30*HZ;
535         init_waitqueue_head(&info->status_event_wait_q);
536         init_waitqueue_head(&info->event_wait_q);
537         spin_lock_init(&info->lock);
538         spin_lock_init(&info->netlock);
539         memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
540         info->idle_mode = HDLC_TXIDLE_FLAGS;
541         info->imra_value = 0xffff;
542         info->imrb_value = 0xffff;
543         info->pim_value = 0xff;
544 
545         info->p_dev = link;
546         link->priv = info;
547 
548         /* Initialize the struct pcmcia_device structure */
549 
550         ret = mgslpc_config(link);
551         if (ret != 0)
552                 goto failed;
553 
554         ret = mgslpc_add_device(info);
555         if (ret != 0)
556                 goto failed_release;
557 
558         return 0;
559 
560 failed_release:
561         mgslpc_release((u_long)link);
562 failed:
563         tty_port_destroy(&info->port);
564         kfree(info);
565         return ret;
566 }
567 
568 /* Card has been inserted.
569  */
570 
571 static int mgslpc_ioprobe(struct pcmcia_device *p_dev, void *priv_data)
572 {
573         return pcmcia_request_io(p_dev);
574 }
575 
576 static int mgslpc_config(struct pcmcia_device *link)
577 {
578         MGSLPC_INFO *info = link->priv;
579         int ret;
580 
581         if (debug_level >= DEBUG_LEVEL_INFO)
582                 printk("mgslpc_config(0x%p)\n", link);
583 
584         link->config_flags |= CONF_ENABLE_IRQ | CONF_AUTO_SET_IO;
585 
586         ret = pcmcia_loop_config(link, mgslpc_ioprobe, NULL);
587         if (ret != 0)
588                 goto failed;
589 
590         link->config_index = 8;
591         link->config_regs = PRESENT_OPTION;
592 
593         ret = pcmcia_request_irq(link, mgslpc_isr);
594         if (ret)
595                 goto failed;
596         ret = pcmcia_enable_device(link);
597         if (ret)
598                 goto failed;
599 
600         info->io_base = link->resource[0]->start;
601         info->irq_level = link->irq;
602         return 0;
603 
604 failed:
605         mgslpc_release((u_long)link);
606         return -ENODEV;
607 }
608 
609 /* Card has been removed.
610  * Unregister device and release PCMCIA configuration.
611  * If device is open, postpone until it is closed.
612  */
613 static void mgslpc_release(u_long arg)
614 {
615         struct pcmcia_device *link = (struct pcmcia_device *)arg;
616 
617         if (debug_level >= DEBUG_LEVEL_INFO)
618                 printk("mgslpc_release(0x%p)\n", link);
619 
620         pcmcia_disable_device(link);
621 }
622 
623 static void mgslpc_detach(struct pcmcia_device *link)
624 {
625         if (debug_level >= DEBUG_LEVEL_INFO)
626                 printk("mgslpc_detach(0x%p)\n", link);
627 
628         ((MGSLPC_INFO *)link->priv)->stop = 1;
629         mgslpc_release((u_long)link);
630 
631         mgslpc_remove_device((MGSLPC_INFO *)link->priv);
632 }
633 
634 static int mgslpc_suspend(struct pcmcia_device *link)
635 {
636         MGSLPC_INFO *info = link->priv;
637 
638         info->stop = 1;
639 
640         return 0;
641 }
642 
643 static int mgslpc_resume(struct pcmcia_device *link)
644 {
645         MGSLPC_INFO *info = link->priv;
646 
647         info->stop = 0;
648 
649         return 0;
650 }
651 
652 
653 static inline bool mgslpc_paranoia_check(MGSLPC_INFO *info,
654                                         char *name, const char *routine)
655 {
656 #ifdef MGSLPC_PARANOIA_CHECK
657         static const char *badmagic =
658                 "Warning: bad magic number for mgsl struct (%s) in %s\n";
659         static const char *badinfo =
660                 "Warning: null mgslpc_info for (%s) in %s\n";
661 
662         if (!info) {
663                 printk(badinfo, name, routine);
664                 return true;
665         }
666         if (info->magic != MGSLPC_MAGIC) {
667                 printk(badmagic, name, routine);
668                 return true;
669         }
670 #else
671         if (!info)
672                 return true;
673 #endif
674         return false;
675 }
676 
677 
678 #define CMD_RXFIFO      BIT7    // release current rx FIFO
679 #define CMD_RXRESET     BIT6    // receiver reset
680 #define CMD_RXFIFO_READ BIT5
681 #define CMD_START_TIMER BIT4
682 #define CMD_TXFIFO      BIT3    // release current tx FIFO
683 #define CMD_TXEOM       BIT1    // transmit end message
684 #define CMD_TXRESET     BIT0    // transmit reset
685 
686 static bool wait_command_complete(MGSLPC_INFO *info, unsigned char channel)
687 {
688         int i = 0;
689         /* wait for command completion */
690         while (read_reg(info, (unsigned char)(channel+STAR)) & BIT2) {
691                 udelay(1);
692                 if (i++ == 1000)
693                         return false;
694         }
695         return true;
696 }
697 
698 static void issue_command(MGSLPC_INFO *info, unsigned char channel, unsigned char cmd)
699 {
700         wait_command_complete(info, channel);
701         write_reg(info, (unsigned char) (channel + CMDR), cmd);
702 }
703 
704 static void tx_pause(struct tty_struct *tty)
705 {
706         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
707         unsigned long flags;
708 
709         if (mgslpc_paranoia_check(info, tty->name, "tx_pause"))
710                 return;
711         if (debug_level >= DEBUG_LEVEL_INFO)
712                 printk("tx_pause(%s)\n", info->device_name);
713 
714         spin_lock_irqsave(&info->lock, flags);
715         if (info->tx_enabled)
716                 tx_stop(info);
717         spin_unlock_irqrestore(&info->lock, flags);
718 }
719 
720 static void tx_release(struct tty_struct *tty)
721 {
722         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
723         unsigned long flags;
724 
725         if (mgslpc_paranoia_check(info, tty->name, "tx_release"))
726                 return;
727         if (debug_level >= DEBUG_LEVEL_INFO)
728                 printk("tx_release(%s)\n", info->device_name);
729 
730         spin_lock_irqsave(&info->lock, flags);
731         if (!info->tx_enabled)
732                 tx_start(info, tty);
733         spin_unlock_irqrestore(&info->lock, flags);
734 }
735 
736 /* Return next bottom half action to perform.
737  * or 0 if nothing to do.
738  */
739 static int bh_action(MGSLPC_INFO *info)
740 {
741         unsigned long flags;
742         int rc = 0;
743 
744         spin_lock_irqsave(&info->lock, flags);
745 
746         if (info->pending_bh & BH_RECEIVE) {
747                 info->pending_bh &= ~BH_RECEIVE;
748                 rc = BH_RECEIVE;
749         } else if (info->pending_bh & BH_TRANSMIT) {
750                 info->pending_bh &= ~BH_TRANSMIT;
751                 rc = BH_TRANSMIT;
752         } else if (info->pending_bh & BH_STATUS) {
753                 info->pending_bh &= ~BH_STATUS;
754                 rc = BH_STATUS;
755         }
756 
757         if (!rc) {
758                 /* Mark BH routine as complete */
759                 info->bh_running = false;
760                 info->bh_requested = false;
761         }
762 
763         spin_unlock_irqrestore(&info->lock, flags);
764 
765         return rc;
766 }
767 
768 static void bh_handler(struct work_struct *work)
769 {
770         MGSLPC_INFO *info = container_of(work, MGSLPC_INFO, task);
771         struct tty_struct *tty;
772         int action;
773 
774         if (debug_level >= DEBUG_LEVEL_BH)
775                 printk("%s(%d):bh_handler(%s) entry\n",
776                         __FILE__,__LINE__,info->device_name);
777 
778         info->bh_running = true;
779         tty = tty_port_tty_get(&info->port);
780 
781         while((action = bh_action(info)) != 0) {
782 
783                 /* Process work item */
784                 if (debug_level >= DEBUG_LEVEL_BH)
785                         printk("%s(%d):bh_handler() work item action=%d\n",
786                                 __FILE__,__LINE__,action);
787 
788                 switch (action) {
789 
790                 case BH_RECEIVE:
791                         while(rx_get_frame(info, tty));
792                         break;
793                 case BH_TRANSMIT:
794                         bh_transmit(info, tty);
795                         break;
796                 case BH_STATUS:
797                         bh_status(info);
798                         break;
799                 default:
800                         /* unknown work item ID */
801                         printk("Unknown work item ID=%08X!\n", action);
802                         break;
803                 }
804         }
805 
806         tty_kref_put(tty);
807         if (debug_level >= DEBUG_LEVEL_BH)
808                 printk("%s(%d):bh_handler(%s) exit\n",
809                         __FILE__,__LINE__,info->device_name);
810 }
811 
812 static void bh_transmit(MGSLPC_INFO *info, struct tty_struct *tty)
813 {
814         if (debug_level >= DEBUG_LEVEL_BH)
815                 printk("bh_transmit() entry on %s\n", info->device_name);
816 
817         if (tty)
818                 tty_wakeup(tty);
819 }
820 
821 static void bh_status(MGSLPC_INFO *info)
822 {
823         info->ri_chkcount = 0;
824         info->dsr_chkcount = 0;
825         info->dcd_chkcount = 0;
826         info->cts_chkcount = 0;
827 }
828 
829 /* eom: non-zero = end of frame */
830 static void rx_ready_hdlc(MGSLPC_INFO *info, int eom)
831 {
832         unsigned char data[2];
833         unsigned char fifo_count, read_count, i;
834         RXBUF *buf = (RXBUF*)(info->rx_buf + (info->rx_put * info->rx_buf_size));
835 
836         if (debug_level >= DEBUG_LEVEL_ISR)
837                 printk("%s(%d):rx_ready_hdlc(eom=%d)\n", __FILE__, __LINE__, eom);
838 
839         if (!info->rx_enabled)
840                 return;
841 
842         if (info->rx_frame_count >= info->rx_buf_count) {
843                 /* no more free buffers */
844                 issue_command(info, CHA, CMD_RXRESET);
845                 info->pending_bh |= BH_RECEIVE;
846                 info->rx_overflow = true;
847                 info->icount.buf_overrun++;
848                 return;
849         }
850 
851         if (eom) {
852                 /* end of frame, get FIFO count from RBCL register */
853                 fifo_count = (unsigned char)(read_reg(info, CHA+RBCL) & 0x1f);
854                 if (fifo_count == 0)
855                         fifo_count = 32;
856         } else
857                 fifo_count = 32;
858 
859         do {
860                 if (fifo_count == 1) {
861                         read_count = 1;
862                         data[0] = read_reg(info, CHA + RXFIFO);
863                 } else {
864                         read_count = 2;
865                         *((unsigned short *) data) = read_reg16(info, CHA + RXFIFO);
866                 }
867                 fifo_count -= read_count;
868                 if (!fifo_count && eom)
869                         buf->status = data[--read_count];
870 
871                 for (i = 0; i < read_count; i++) {
872                         if (buf->count >= info->max_frame_size) {
873                                 /* frame too large, reset receiver and reset current buffer */
874                                 issue_command(info, CHA, CMD_RXRESET);
875                                 buf->count = 0;
876                                 return;
877                         }
878                         *(buf->data + buf->count) = data[i];
879                         buf->count++;
880                 }
881         } while (fifo_count);
882 
883         if (eom) {
884                 info->pending_bh |= BH_RECEIVE;
885                 info->rx_frame_count++;
886                 info->rx_put++;
887                 if (info->rx_put >= info->rx_buf_count)
888                         info->rx_put = 0;
889         }
890         issue_command(info, CHA, CMD_RXFIFO);
891 }
892 
893 static void rx_ready_async(MGSLPC_INFO *info, int tcd)
894 {
895         struct tty_port *port = &info->port;
896         unsigned char data, status, flag;
897         int fifo_count;
898         int work = 0;
899         struct mgsl_icount *icount = &info->icount;
900 
901         if (tcd) {
902                 /* early termination, get FIFO count from RBCL register */
903                 fifo_count = (unsigned char)(read_reg(info, CHA+RBCL) & 0x1f);
904 
905                 /* Zero fifo count could mean 0 or 32 bytes available.
906                  * If BIT5 of STAR is set then at least 1 byte is available.
907                  */
908                 if (!fifo_count && (read_reg(info,CHA+STAR) & BIT5))
909                         fifo_count = 32;
910         } else
911                 fifo_count = 32;
912 
913         tty_buffer_request_room(port, fifo_count);
914         /* Flush received async data to receive data buffer. */
915         while (fifo_count) {
916                 data   = read_reg(info, CHA + RXFIFO);
917                 status = read_reg(info, CHA + RXFIFO);
918                 fifo_count -= 2;
919 
920                 icount->rx++;
921                 flag = TTY_NORMAL;
922 
923                 // if no frameing/crc error then save data
924                 // BIT7:parity error
925                 // BIT6:framing error
926 
927                 if (status & (BIT7 + BIT6)) {
928                         if (status & BIT7)
929                                 icount->parity++;
930                         else
931                                 icount->frame++;
932 
933                         /* discard char if tty control flags say so */
934                         if (status & info->ignore_status_mask)
935                                 continue;
936 
937                         status &= info->read_status_mask;
938 
939                         if (status & BIT7)
940                                 flag = TTY_PARITY;
941                         else if (status & BIT6)
942                                 flag = TTY_FRAME;
943                 }
944                 work += tty_insert_flip_char(port, data, flag);
945         }
946         issue_command(info, CHA, CMD_RXFIFO);
947 
948         if (debug_level >= DEBUG_LEVEL_ISR) {
949                 printk("%s(%d):rx_ready_async",
950                         __FILE__,__LINE__);
951                 printk("%s(%d):rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
952                         __FILE__,__LINE__,icount->rx,icount->brk,
953                         icount->parity,icount->frame,icount->overrun);
954         }
955 
956         if (work)
957                 tty_flip_buffer_push(port);
958 }
959 
960 
961 static void tx_done(MGSLPC_INFO *info, struct tty_struct *tty)
962 {
963         if (!info->tx_active)
964                 return;
965 
966         info->tx_active = false;
967         info->tx_aborting = false;
968 
969         if (info->params.mode == MGSL_MODE_ASYNC)
970                 return;
971 
972         info->tx_count = info->tx_put = info->tx_get = 0;
973         del_timer(&info->tx_timer);
974 
975         if (info->drop_rts_on_tx_done) {
976                 get_signals(info);
977                 if (info->serial_signals & SerialSignal_RTS) {
978                         info->serial_signals &= ~SerialSignal_RTS;
979                         set_signals(info);
980                 }
981                 info->drop_rts_on_tx_done = false;
982         }
983 
984 #if SYNCLINK_GENERIC_HDLC
985         if (info->netcount)
986                 hdlcdev_tx_done(info);
987         else
988 #endif
989         {
990                 if (tty && (tty->stopped || tty->hw_stopped)) {
991                         tx_stop(info);
992                         return;
993                 }
994                 info->pending_bh |= BH_TRANSMIT;
995         }
996 }
997 
998 static void tx_ready(MGSLPC_INFO *info, struct tty_struct *tty)
999 {
1000         unsigned char fifo_count = 32;
1001         int c;
1002 
1003         if (debug_level >= DEBUG_LEVEL_ISR)
1004                 printk("%s(%d):tx_ready(%s)\n", __FILE__, __LINE__, info->device_name);
1005 
1006         if (info->params.mode == MGSL_MODE_HDLC) {
1007                 if (!info->tx_active)
1008                         return;
1009         } else {
1010                 if (tty && (tty->stopped || tty->hw_stopped)) {
1011                         tx_stop(info);
1012                         return;
1013                 }
1014                 if (!info->tx_count)
1015                         info->tx_active = false;
1016         }
1017 
1018         if (!info->tx_count)
1019                 return;
1020 
1021         while (info->tx_count && fifo_count) {
1022                 c = min(2, min_t(int, fifo_count, min(info->tx_count, TXBUFSIZE - info->tx_get)));
1023 
1024                 if (c == 1) {
1025                         write_reg(info, CHA + TXFIFO, *(info->tx_buf + info->tx_get));
1026                 } else {
1027                         write_reg16(info, CHA + TXFIFO,
1028                                           *((unsigned short*)(info->tx_buf + info->tx_get)));
1029                 }
1030                 info->tx_count -= c;
1031                 info->tx_get = (info->tx_get + c) & (TXBUFSIZE - 1);
1032                 fifo_count -= c;
1033         }
1034 
1035         if (info->params.mode == MGSL_MODE_ASYNC) {
1036                 if (info->tx_count < WAKEUP_CHARS)
1037                         info->pending_bh |= BH_TRANSMIT;
1038                 issue_command(info, CHA, CMD_TXFIFO);
1039         } else {
1040                 if (info->tx_count)
1041                         issue_command(info, CHA, CMD_TXFIFO);
1042                 else
1043                         issue_command(info, CHA, CMD_TXFIFO + CMD_TXEOM);
1044         }
1045 }
1046 
1047 static void cts_change(MGSLPC_INFO *info, struct tty_struct *tty)
1048 {
1049         get_signals(info);
1050         if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1051                 irq_disable(info, CHB, IRQ_CTS);
1052         info->icount.cts++;
1053         if (info->serial_signals & SerialSignal_CTS)
1054                 info->input_signal_events.cts_up++;
1055         else
1056                 info->input_signal_events.cts_down++;
1057         wake_up_interruptible(&info->status_event_wait_q);
1058         wake_up_interruptible(&info->event_wait_q);
1059 
1060         if (tty && tty_port_cts_enabled(&info->port)) {
1061                 if (tty->hw_stopped) {
1062                         if (info->serial_signals & SerialSignal_CTS) {
1063                                 if (debug_level >= DEBUG_LEVEL_ISR)
1064                                         printk("CTS tx start...");
1065                                 tty->hw_stopped = 0;
1066                                 tx_start(info, tty);
1067                                 info->pending_bh |= BH_TRANSMIT;
1068                                 return;
1069                         }
1070                 } else {
1071                         if (!(info->serial_signals & SerialSignal_CTS)) {
1072                                 if (debug_level >= DEBUG_LEVEL_ISR)
1073                                         printk("CTS tx stop...");
1074                                 tty->hw_stopped = 1;
1075                                 tx_stop(info);
1076                         }
1077                 }
1078         }
1079         info->pending_bh |= BH_STATUS;
1080 }
1081 
1082 static void dcd_change(MGSLPC_INFO *info, struct tty_struct *tty)
1083 {
1084         get_signals(info);
1085         if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1086                 irq_disable(info, CHB, IRQ_DCD);
1087         info->icount.dcd++;
1088         if (info->serial_signals & SerialSignal_DCD) {
1089                 info->input_signal_events.dcd_up++;
1090         }
1091         else
1092                 info->input_signal_events.dcd_down++;
1093 #if SYNCLINK_GENERIC_HDLC
1094         if (info->netcount) {
1095                 if (info->serial_signals & SerialSignal_DCD)
1096                         netif_carrier_on(info->netdev);
1097                 else
1098                         netif_carrier_off(info->netdev);
1099         }
1100 #endif
1101         wake_up_interruptible(&info->status_event_wait_q);
1102         wake_up_interruptible(&info->event_wait_q);
1103 
1104         if (info->port.flags & ASYNC_CHECK_CD) {
1105                 if (debug_level >= DEBUG_LEVEL_ISR)
1106                         printk("%s CD now %s...", info->device_name,
1107                                (info->serial_signals & SerialSignal_DCD) ? "on" : "off");
1108                 if (info->serial_signals & SerialSignal_DCD)
1109                         wake_up_interruptible(&info->port.open_wait);
1110                 else {
1111                         if (debug_level >= DEBUG_LEVEL_ISR)
1112                                 printk("doing serial hangup...");
1113                         if (tty)
1114                                 tty_hangup(tty);
1115                 }
1116         }
1117         info->pending_bh |= BH_STATUS;
1118 }
1119 
1120 static void dsr_change(MGSLPC_INFO *info)
1121 {
1122         get_signals(info);
1123         if ((info->dsr_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1124                 port_irq_disable(info, PVR_DSR);
1125         info->icount.dsr++;
1126         if (info->serial_signals & SerialSignal_DSR)
1127                 info->input_signal_events.dsr_up++;
1128         else
1129                 info->input_signal_events.dsr_down++;
1130         wake_up_interruptible(&info->status_event_wait_q);
1131         wake_up_interruptible(&info->event_wait_q);
1132         info->pending_bh |= BH_STATUS;
1133 }
1134 
1135 static void ri_change(MGSLPC_INFO *info)
1136 {
1137         get_signals(info);
1138         if ((info->ri_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1139                 port_irq_disable(info, PVR_RI);
1140         info->icount.rng++;
1141         if (info->serial_signals & SerialSignal_RI)
1142                 info->input_signal_events.ri_up++;
1143         else
1144                 info->input_signal_events.ri_down++;
1145         wake_up_interruptible(&info->status_event_wait_q);
1146         wake_up_interruptible(&info->event_wait_q);
1147         info->pending_bh |= BH_STATUS;
1148 }
1149 
1150 /* Interrupt service routine entry point.
1151  *
1152  * Arguments:
1153  *
1154  * irq     interrupt number that caused interrupt
1155  * dev_id  device ID supplied during interrupt registration
1156  */
1157 static irqreturn_t mgslpc_isr(int dummy, void *dev_id)
1158 {
1159         MGSLPC_INFO *info = dev_id;
1160         struct tty_struct *tty;
1161         unsigned short isr;
1162         unsigned char gis, pis;
1163         int count=0;
1164 
1165         if (debug_level >= DEBUG_LEVEL_ISR)
1166                 printk("mgslpc_isr(%d) entry.\n", info->irq_level);
1167 
1168         if (!(info->p_dev->_locked))
1169                 return IRQ_HANDLED;
1170 
1171         tty = tty_port_tty_get(&info->port);
1172 
1173         spin_lock(&info->lock);
1174 
1175         while ((gis = read_reg(info, CHA + GIS))) {
1176                 if (debug_level >= DEBUG_LEVEL_ISR)
1177                         printk("mgslpc_isr %s gis=%04X\n", info->device_name,gis);
1178 
1179                 if ((gis & 0x70) || count > 1000) {
1180                         printk("synclink_cs:hardware failed or ejected\n");
1181                         break;
1182                 }
1183                 count++;
1184 
1185                 if (gis & (BIT1 | BIT0)) {
1186                         isr = read_reg16(info, CHB + ISR);
1187                         if (isr & IRQ_DCD)
1188                                 dcd_change(info, tty);
1189                         if (isr & IRQ_CTS)
1190                                 cts_change(info, tty);
1191                 }
1192                 if (gis & (BIT3 | BIT2))
1193                 {
1194                         isr = read_reg16(info, CHA + ISR);
1195                         if (isr & IRQ_TIMER) {
1196                                 info->irq_occurred = true;
1197                                 irq_disable(info, CHA, IRQ_TIMER);
1198                         }
1199 
1200                         /* receive IRQs */
1201                         if (isr & IRQ_EXITHUNT) {
1202                                 info->icount.exithunt++;
1203                                 wake_up_interruptible(&info->event_wait_q);
1204                         }
1205                         if (isr & IRQ_BREAK_ON) {
1206                                 info->icount.brk++;
1207                                 if (info->port.flags & ASYNC_SAK)
1208                                         do_SAK(tty);
1209                         }
1210                         if (isr & IRQ_RXTIME) {
1211                                 issue_command(info, CHA, CMD_RXFIFO_READ);
1212                         }
1213                         if (isr & (IRQ_RXEOM | IRQ_RXFIFO)) {
1214                                 if (info->params.mode == MGSL_MODE_HDLC)
1215                                         rx_ready_hdlc(info, isr & IRQ_RXEOM);
1216                                 else
1217                                         rx_ready_async(info, isr & IRQ_RXEOM);
1218                         }
1219 
1220                         /* transmit IRQs */
1221                         if (isr & IRQ_UNDERRUN) {
1222                                 if (info->tx_aborting)
1223                                         info->icount.txabort++;
1224                                 else
1225                                         info->icount.txunder++;
1226                                 tx_done(info, tty);
1227                         }
1228                         else if (isr & IRQ_ALLSENT) {
1229                                 info->icount.txok++;
1230                                 tx_done(info, tty);
1231                         }
1232                         else if (isr & IRQ_TXFIFO)
1233                                 tx_ready(info, tty);
1234                 }
1235                 if (gis & BIT7) {
1236                         pis = read_reg(info, CHA + PIS);
1237                         if (pis & BIT1)
1238                                 dsr_change(info);
1239                         if (pis & BIT2)
1240                                 ri_change(info);
1241                 }
1242         }
1243 
1244         /* Request bottom half processing if there's something
1245          * for it to do and the bh is not already running
1246          */
1247 
1248         if (info->pending_bh && !info->bh_running && !info->bh_requested) {
1249                 if (debug_level >= DEBUG_LEVEL_ISR)
1250                         printk("%s(%d):%s queueing bh task.\n",
1251                                 __FILE__,__LINE__,info->device_name);
1252                 schedule_work(&info->task);
1253                 info->bh_requested = true;
1254         }
1255 
1256         spin_unlock(&info->lock);
1257         tty_kref_put(tty);
1258 
1259         if (debug_level >= DEBUG_LEVEL_ISR)
1260                 printk("%s(%d):mgslpc_isr(%d)exit.\n",
1261                        __FILE__, __LINE__, info->irq_level);
1262 
1263         return IRQ_HANDLED;
1264 }
1265 
1266 /* Initialize and start device.
1267  */
1268 static int startup(MGSLPC_INFO * info, struct tty_struct *tty)
1269 {
1270         int retval = 0;
1271 
1272         if (debug_level >= DEBUG_LEVEL_INFO)
1273                 printk("%s(%d):startup(%s)\n", __FILE__, __LINE__, info->device_name);
1274 
1275         if (info->port.flags & ASYNC_INITIALIZED)
1276                 return 0;
1277 
1278         if (!info->tx_buf) {
1279                 /* allocate a page of memory for a transmit buffer */
1280                 info->tx_buf = (unsigned char *)get_zeroed_page(GFP_KERNEL);
1281                 if (!info->tx_buf) {
1282                         printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
1283                                 __FILE__, __LINE__, info->device_name);
1284                         return -ENOMEM;
1285                 }
1286         }
1287 
1288         info->pending_bh = 0;
1289 
1290         memset(&info->icount, 0, sizeof(info->icount));
1291 
1292         setup_timer(&info->tx_timer, tx_timeout, (unsigned long)info);
1293 
1294         /* Allocate and claim adapter resources */
1295         retval = claim_resources(info);
1296 
1297         /* perform existence check and diagnostics */
1298         if (!retval)
1299                 retval = adapter_test(info);
1300 
1301         if (retval) {
1302                 if (capable(CAP_SYS_ADMIN) && tty)
1303                         set_bit(TTY_IO_ERROR, &tty->flags);
1304                 release_resources(info);
1305                 return retval;
1306         }
1307 
1308         /* program hardware for current parameters */
1309         mgslpc_change_params(info, tty);
1310 
1311         if (tty)
1312                 clear_bit(TTY_IO_ERROR, &tty->flags);
1313 
1314         info->port.flags |= ASYNC_INITIALIZED;
1315 
1316         return 0;
1317 }
1318 
1319 /* Called by mgslpc_close() and mgslpc_hangup() to shutdown hardware
1320  */
1321 static void shutdown(MGSLPC_INFO * info, struct tty_struct *tty)
1322 {
1323         unsigned long flags;
1324 
1325         if (!(info->port.flags & ASYNC_INITIALIZED))
1326                 return;
1327 
1328         if (debug_level >= DEBUG_LEVEL_INFO)
1329                 printk("%s(%d):mgslpc_shutdown(%s)\n",
1330                          __FILE__, __LINE__, info->device_name);
1331 
1332         /* clear status wait queue because status changes */
1333         /* can't happen after shutting down the hardware */
1334         wake_up_interruptible(&info->status_event_wait_q);
1335         wake_up_interruptible(&info->event_wait_q);
1336 
1337         del_timer_sync(&info->tx_timer);
1338 
1339         if (info->tx_buf) {
1340                 free_page((unsigned long) info->tx_buf);
1341                 info->tx_buf = NULL;
1342         }
1343 
1344         spin_lock_irqsave(&info->lock, flags);
1345 
1346         rx_stop(info);
1347         tx_stop(info);
1348 
1349         /* TODO:disable interrupts instead of reset to preserve signal states */
1350         reset_device(info);
1351 
1352         if (!tty || C_HUPCL(tty)) {
1353                 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
1354                 set_signals(info);
1355         }
1356 
1357         spin_unlock_irqrestore(&info->lock, flags);
1358 
1359         release_resources(info);
1360 
1361         if (tty)
1362                 set_bit(TTY_IO_ERROR, &tty->flags);
1363 
1364         info->port.flags &= ~ASYNC_INITIALIZED;
1365 }
1366 
1367 static void mgslpc_program_hw(MGSLPC_INFO *info, struct tty_struct *tty)
1368 {
1369         unsigned long flags;
1370 
1371         spin_lock_irqsave(&info->lock, flags);
1372 
1373         rx_stop(info);
1374         tx_stop(info);
1375         info->tx_count = info->tx_put = info->tx_get = 0;
1376 
1377         if (info->params.mode == MGSL_MODE_HDLC || info->netcount)
1378                 hdlc_mode(info);
1379         else
1380                 async_mode(info);
1381 
1382         set_signals(info);
1383 
1384         info->dcd_chkcount = 0;
1385         info->cts_chkcount = 0;
1386         info->ri_chkcount = 0;
1387         info->dsr_chkcount = 0;
1388 
1389         irq_enable(info, CHB, IRQ_DCD | IRQ_CTS);
1390         port_irq_enable(info, (unsigned char) PVR_DSR | PVR_RI);
1391         get_signals(info);
1392 
1393         if (info->netcount || (tty && C_CREAD(tty)))
1394                 rx_start(info);
1395 
1396         spin_unlock_irqrestore(&info->lock, flags);
1397 }
1398 
1399 /* Reconfigure adapter based on new parameters
1400  */
1401 static void mgslpc_change_params(MGSLPC_INFO *info, struct tty_struct *tty)
1402 {
1403         unsigned cflag;
1404         int bits_per_char;
1405 
1406         if (!tty)
1407                 return;
1408 
1409         if (debug_level >= DEBUG_LEVEL_INFO)
1410                 printk("%s(%d):mgslpc_change_params(%s)\n",
1411                          __FILE__, __LINE__, info->device_name);
1412 
1413         cflag = tty->termios.c_cflag;
1414 
1415         /* if B0 rate (hangup) specified then negate RTS and DTR */
1416         /* otherwise assert RTS and DTR */
1417         if (cflag & CBAUD)
1418                 info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR;
1419         else
1420                 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
1421 
1422         /* byte size and parity */
1423 
1424         switch (cflag & CSIZE) {
1425         case CS5: info->params.data_bits = 5; break;
1426         case CS6: info->params.data_bits = 6; break;
1427         case CS7: info->params.data_bits = 7; break;
1428         case CS8: info->params.data_bits = 8; break;
1429         default:  info->params.data_bits = 7; break;
1430         }
1431 
1432         if (cflag & CSTOPB)
1433                 info->params.stop_bits = 2;
1434         else
1435                 info->params.stop_bits = 1;
1436 
1437         info->params.parity = ASYNC_PARITY_NONE;
1438         if (cflag & PARENB) {
1439                 if (cflag & PARODD)
1440                         info->params.parity = ASYNC_PARITY_ODD;
1441                 else
1442                         info->params.parity = ASYNC_PARITY_EVEN;
1443 #ifdef CMSPAR
1444                 if (cflag & CMSPAR)
1445                         info->params.parity = ASYNC_PARITY_SPACE;
1446 #endif
1447         }
1448 
1449         /* calculate number of jiffies to transmit a full
1450          * FIFO (32 bytes) at specified data rate
1451          */
1452         bits_per_char = info->params.data_bits +
1453                         info->params.stop_bits + 1;
1454 
1455         /* if port data rate is set to 460800 or less then
1456          * allow tty settings to override, otherwise keep the
1457          * current data rate.
1458          */
1459         if (info->params.data_rate <= 460800) {
1460                 info->params.data_rate = tty_get_baud_rate(tty);
1461         }
1462 
1463         if (info->params.data_rate) {
1464                 info->timeout = (32*HZ*bits_per_char) /
1465                                 info->params.data_rate;
1466         }
1467         info->timeout += HZ/50;         /* Add .02 seconds of slop */
1468 
1469         if (cflag & CRTSCTS)
1470                 info->port.flags |= ASYNC_CTS_FLOW;
1471         else
1472                 info->port.flags &= ~ASYNC_CTS_FLOW;
1473 
1474         if (cflag & CLOCAL)
1475                 info->port.flags &= ~ASYNC_CHECK_CD;
1476         else
1477                 info->port.flags |= ASYNC_CHECK_CD;
1478 
1479         /* process tty input control flags */
1480 
1481         info->read_status_mask = 0;
1482         if (I_INPCK(tty))
1483                 info->read_status_mask |= BIT7 | BIT6;
1484         if (I_IGNPAR(tty))
1485                 info->ignore_status_mask |= BIT7 | BIT6;
1486 
1487         mgslpc_program_hw(info, tty);
1488 }
1489 
1490 /* Add a character to the transmit buffer
1491  */
1492 static int mgslpc_put_char(struct tty_struct *tty, unsigned char ch)
1493 {
1494         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1495         unsigned long flags;
1496 
1497         if (debug_level >= DEBUG_LEVEL_INFO) {
1498                 printk("%s(%d):mgslpc_put_char(%d) on %s\n",
1499                         __FILE__, __LINE__, ch, info->device_name);
1500         }
1501 
1502         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_put_char"))
1503                 return 0;
1504 
1505         if (!info->tx_buf)
1506                 return 0;
1507 
1508         spin_lock_irqsave(&info->lock, flags);
1509 
1510         if (info->params.mode == MGSL_MODE_ASYNC || !info->tx_active) {
1511                 if (info->tx_count < TXBUFSIZE - 1) {
1512                         info->tx_buf[info->tx_put++] = ch;
1513                         info->tx_put &= TXBUFSIZE-1;
1514                         info->tx_count++;
1515                 }
1516         }
1517 
1518         spin_unlock_irqrestore(&info->lock, flags);
1519         return 1;
1520 }
1521 
1522 /* Enable transmitter so remaining characters in the
1523  * transmit buffer are sent.
1524  */
1525 static void mgslpc_flush_chars(struct tty_struct *tty)
1526 {
1527         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1528         unsigned long flags;
1529 
1530         if (debug_level >= DEBUG_LEVEL_INFO)
1531                 printk("%s(%d):mgslpc_flush_chars() entry on %s tx_count=%d\n",
1532                         __FILE__, __LINE__, info->device_name, info->tx_count);
1533 
1534         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_flush_chars"))
1535                 return;
1536 
1537         if (info->tx_count <= 0 || tty->stopped ||
1538             tty->hw_stopped || !info->tx_buf)
1539                 return;
1540 
1541         if (debug_level >= DEBUG_LEVEL_INFO)
1542                 printk("%s(%d):mgslpc_flush_chars() entry on %s starting transmitter\n",
1543                         __FILE__, __LINE__, info->device_name);
1544 
1545         spin_lock_irqsave(&info->lock, flags);
1546         if (!info->tx_active)
1547                 tx_start(info, tty);
1548         spin_unlock_irqrestore(&info->lock, flags);
1549 }
1550 
1551 /* Send a block of data
1552  *
1553  * Arguments:
1554  *
1555  * tty        pointer to tty information structure
1556  * buf        pointer to buffer containing send data
1557  * count      size of send data in bytes
1558  *
1559  * Returns: number of characters written
1560  */
1561 static int mgslpc_write(struct tty_struct * tty,
1562                         const unsigned char *buf, int count)
1563 {
1564         int c, ret = 0;
1565         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1566         unsigned long flags;
1567 
1568         if (debug_level >= DEBUG_LEVEL_INFO)
1569                 printk("%s(%d):mgslpc_write(%s) count=%d\n",
1570                         __FILE__, __LINE__, info->device_name, count);
1571 
1572         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_write") ||
1573                 !info->tx_buf)
1574                 goto cleanup;
1575 
1576         if (info->params.mode == MGSL_MODE_HDLC) {
1577                 if (count > TXBUFSIZE) {
1578                         ret = -EIO;
1579                         goto cleanup;
1580                 }
1581                 if (info->tx_active)
1582                         goto cleanup;
1583                 else if (info->tx_count)
1584                         goto start;
1585         }
1586 
1587         for (;;) {
1588                 c = min(count,
1589                         min(TXBUFSIZE - info->tx_count - 1,
1590                             TXBUFSIZE - info->tx_put));
1591                 if (c <= 0)
1592                         break;
1593 
1594                 memcpy(info->tx_buf + info->tx_put, buf, c);
1595 
1596                 spin_lock_irqsave(&info->lock, flags);
1597                 info->tx_put = (info->tx_put + c) & (TXBUFSIZE-1);
1598                 info->tx_count += c;
1599                 spin_unlock_irqrestore(&info->lock, flags);
1600 
1601                 buf += c;
1602                 count -= c;
1603                 ret += c;
1604         }
1605 start:
1606         if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
1607                 spin_lock_irqsave(&info->lock, flags);
1608                 if (!info->tx_active)
1609                         tx_start(info, tty);
1610                 spin_unlock_irqrestore(&info->lock, flags);
1611         }
1612 cleanup:
1613         if (debug_level >= DEBUG_LEVEL_INFO)
1614                 printk("%s(%d):mgslpc_write(%s) returning=%d\n",
1615                         __FILE__, __LINE__, info->device_name, ret);
1616         return ret;
1617 }
1618 
1619 /* Return the count of free bytes in transmit buffer
1620  */
1621 static int mgslpc_write_room(struct tty_struct *tty)
1622 {
1623         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1624         int ret;
1625 
1626         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_write_room"))
1627                 return 0;
1628 
1629         if (info->params.mode == MGSL_MODE_HDLC) {
1630                 /* HDLC (frame oriented) mode */
1631                 if (info->tx_active)
1632                         return 0;
1633                 else
1634                         return HDLC_MAX_FRAME_SIZE;
1635         } else {
1636                 ret = TXBUFSIZE - info->tx_count - 1;
1637                 if (ret < 0)
1638                         ret = 0;
1639         }
1640 
1641         if (debug_level >= DEBUG_LEVEL_INFO)
1642                 printk("%s(%d):mgslpc_write_room(%s)=%d\n",
1643                          __FILE__, __LINE__, info->device_name, ret);
1644         return ret;
1645 }
1646 
1647 /* Return the count of bytes in transmit buffer
1648  */
1649 static int mgslpc_chars_in_buffer(struct tty_struct *tty)
1650 {
1651         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1652         int rc;
1653 
1654         if (debug_level >= DEBUG_LEVEL_INFO)
1655                 printk("%s(%d):mgslpc_chars_in_buffer(%s)\n",
1656                          __FILE__, __LINE__, info->device_name);
1657 
1658         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_chars_in_buffer"))
1659                 return 0;
1660 
1661         if (info->params.mode == MGSL_MODE_HDLC)
1662                 rc = info->tx_active ? info->max_frame_size : 0;
1663         else
1664                 rc = info->tx_count;
1665 
1666         if (debug_level >= DEBUG_LEVEL_INFO)
1667                 printk("%s(%d):mgslpc_chars_in_buffer(%s)=%d\n",
1668                          __FILE__, __LINE__, info->device_name, rc);
1669 
1670         return rc;
1671 }
1672 
1673 /* Discard all data in the send buffer
1674  */
1675 static void mgslpc_flush_buffer(struct tty_struct *tty)
1676 {
1677         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1678         unsigned long flags;
1679 
1680         if (debug_level >= DEBUG_LEVEL_INFO)
1681                 printk("%s(%d):mgslpc_flush_buffer(%s) entry\n",
1682                          __FILE__, __LINE__, info->device_name);
1683 
1684         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_flush_buffer"))
1685                 return;
1686 
1687         spin_lock_irqsave(&info->lock, flags);
1688         info->tx_count = info->tx_put = info->tx_get = 0;
1689         del_timer(&info->tx_timer);
1690         spin_unlock_irqrestore(&info->lock, flags);
1691 
1692         wake_up_interruptible(&tty->write_wait);
1693         tty_wakeup(tty);
1694 }
1695 
1696 /* Send a high-priority XON/XOFF character
1697  */
1698 static void mgslpc_send_xchar(struct tty_struct *tty, char ch)
1699 {
1700         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1701         unsigned long flags;
1702 
1703         if (debug_level >= DEBUG_LEVEL_INFO)
1704                 printk("%s(%d):mgslpc_send_xchar(%s,%d)\n",
1705                          __FILE__, __LINE__, info->device_name, ch);
1706 
1707         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_send_xchar"))
1708                 return;
1709 
1710         info->x_char = ch;
1711         if (ch) {
1712                 spin_lock_irqsave(&info->lock, flags);
1713                 if (!info->tx_enabled)
1714                         tx_start(info, tty);
1715                 spin_unlock_irqrestore(&info->lock, flags);
1716         }
1717 }
1718 
1719 /* Signal remote device to throttle send data (our receive data)
1720  */
1721 static void mgslpc_throttle(struct tty_struct * tty)
1722 {
1723         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1724         unsigned long flags;
1725 
1726         if (debug_level >= DEBUG_LEVEL_INFO)
1727                 printk("%s(%d):mgslpc_throttle(%s) entry\n",
1728                          __FILE__, __LINE__, info->device_name);
1729 
1730         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_throttle"))
1731                 return;
1732 
1733         if (I_IXOFF(tty))
1734                 mgslpc_send_xchar(tty, STOP_CHAR(tty));
1735 
1736         if (C_CRTSCTS(tty)) {
1737                 spin_lock_irqsave(&info->lock, flags);
1738                 info->serial_signals &= ~SerialSignal_RTS;
1739                 set_signals(info);
1740                 spin_unlock_irqrestore(&info->lock, flags);
1741         }
1742 }
1743 
1744 /* Signal remote device to stop throttling send data (our receive data)
1745  */
1746 static void mgslpc_unthrottle(struct tty_struct * tty)
1747 {
1748         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1749         unsigned long flags;
1750 
1751         if (debug_level >= DEBUG_LEVEL_INFO)
1752                 printk("%s(%d):mgslpc_unthrottle(%s) entry\n",
1753                          __FILE__, __LINE__, info->device_name);
1754 
1755         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_unthrottle"))
1756                 return;
1757 
1758         if (I_IXOFF(tty)) {
1759                 if (info->x_char)
1760                         info->x_char = 0;
1761                 else
1762                         mgslpc_send_xchar(tty, START_CHAR(tty));
1763         }
1764 
1765         if (C_CRTSCTS(tty)) {
1766                 spin_lock_irqsave(&info->lock, flags);
1767                 info->serial_signals |= SerialSignal_RTS;
1768                 set_signals(info);
1769                 spin_unlock_irqrestore(&info->lock, flags);
1770         }
1771 }
1772 
1773 /* get the current serial statistics
1774  */
1775 static int get_stats(MGSLPC_INFO * info, struct mgsl_icount __user *user_icount)
1776 {
1777         int err;
1778         if (debug_level >= DEBUG_LEVEL_INFO)
1779                 printk("get_params(%s)\n", info->device_name);
1780         if (!user_icount) {
1781                 memset(&info->icount, 0, sizeof(info->icount));
1782         } else {
1783                 COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
1784                 if (err)
1785                         return -EFAULT;
1786         }
1787         return 0;
1788 }
1789 
1790 /* get the current serial parameters
1791  */
1792 static int get_params(MGSLPC_INFO * info, MGSL_PARAMS __user *user_params)
1793 {
1794         int err;
1795         if (debug_level >= DEBUG_LEVEL_INFO)
1796                 printk("get_params(%s)\n", info->device_name);
1797         COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
1798         if (err)
1799                 return -EFAULT;
1800         return 0;
1801 }
1802 
1803 /* set the serial parameters
1804  *
1805  * Arguments:
1806  *
1807  *      info            pointer to device instance data
1808  *      new_params      user buffer containing new serial params
1809  *
1810  * Returns:     0 if success, otherwise error code
1811  */
1812 static int set_params(MGSLPC_INFO * info, MGSL_PARAMS __user *new_params, struct tty_struct *tty)
1813 {
1814         unsigned long flags;
1815         MGSL_PARAMS tmp_params;
1816         int err;
1817 
1818         if (debug_level >= DEBUG_LEVEL_INFO)
1819                 printk("%s(%d):set_params %s\n", __FILE__,__LINE__,
1820                         info->device_name);
1821         COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
1822         if (err) {
1823                 if (debug_level >= DEBUG_LEVEL_INFO)
1824                         printk("%s(%d):set_params(%s) user buffer copy failed\n",
1825                                 __FILE__, __LINE__, info->device_name);
1826                 return -EFAULT;
1827         }
1828 
1829         spin_lock_irqsave(&info->lock, flags);
1830         memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
1831         spin_unlock_irqrestore(&info->lock, flags);
1832 
1833         mgslpc_change_params(info, tty);
1834 
1835         return 0;
1836 }
1837 
1838 static int get_txidle(MGSLPC_INFO * info, int __user *idle_mode)
1839 {
1840         int err;
1841         if (debug_level >= DEBUG_LEVEL_INFO)
1842                 printk("get_txidle(%s)=%d\n", info->device_name, info->idle_mode);
1843         COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
1844         if (err)
1845                 return -EFAULT;
1846         return 0;
1847 }
1848 
1849 static int set_txidle(MGSLPC_INFO * info, int idle_mode)
1850 {
1851         unsigned long flags;
1852         if (debug_level >= DEBUG_LEVEL_INFO)
1853                 printk("set_txidle(%s,%d)\n", info->device_name, idle_mode);
1854         spin_lock_irqsave(&info->lock, flags);
1855         info->idle_mode = idle_mode;
1856         tx_set_idle(info);
1857         spin_unlock_irqrestore(&info->lock, flags);
1858         return 0;
1859 }
1860 
1861 static int get_interface(MGSLPC_INFO * info, int __user *if_mode)
1862 {
1863         int err;
1864         if (debug_level >= DEBUG_LEVEL_INFO)
1865                 printk("get_interface(%s)=%d\n", info->device_name, info->if_mode);
1866         COPY_TO_USER(err,if_mode, &info->if_mode, sizeof(int));
1867         if (err)
1868                 return -EFAULT;
1869         return 0;
1870 }
1871 
1872 static int set_interface(MGSLPC_INFO * info, int if_mode)
1873 {
1874         unsigned long flags;
1875         unsigned char val;
1876         if (debug_level >= DEBUG_LEVEL_INFO)
1877                 printk("set_interface(%s,%d)\n", info->device_name, if_mode);
1878         spin_lock_irqsave(&info->lock, flags);
1879         info->if_mode = if_mode;
1880 
1881         val = read_reg(info, PVR) & 0x0f;
1882         switch (info->if_mode)
1883         {
1884         case MGSL_INTERFACE_RS232: val |= PVR_RS232; break;
1885         case MGSL_INTERFACE_V35:   val |= PVR_V35;   break;
1886         case MGSL_INTERFACE_RS422: val |= PVR_RS422; break;
1887         }
1888         write_reg(info, PVR, val);
1889 
1890         spin_unlock_irqrestore(&info->lock, flags);
1891         return 0;
1892 }
1893 
1894 static int set_txenable(MGSLPC_INFO * info, int enable, struct tty_struct *tty)
1895 {
1896         unsigned long flags;
1897 
1898         if (debug_level >= DEBUG_LEVEL_INFO)
1899                 printk("set_txenable(%s,%d)\n", info->device_name, enable);
1900 
1901         spin_lock_irqsave(&info->lock, flags);
1902         if (enable) {
1903                 if (!info->tx_enabled)
1904                         tx_start(info, tty);
1905         } else {
1906                 if (info->tx_enabled)
1907                         tx_stop(info);
1908         }
1909         spin_unlock_irqrestore(&info->lock, flags);
1910         return 0;
1911 }
1912 
1913 static int tx_abort(MGSLPC_INFO * info)
1914 {
1915         unsigned long flags;
1916 
1917         if (debug_level >= DEBUG_LEVEL_INFO)
1918                 printk("tx_abort(%s)\n", info->device_name);
1919 
1920         spin_lock_irqsave(&info->lock, flags);
1921         if (info->tx_active && info->tx_count &&
1922             info->params.mode == MGSL_MODE_HDLC) {
1923                 /* clear data count so FIFO is not filled on next IRQ.
1924                  * This results in underrun and abort transmission.
1925                  */
1926                 info->tx_count = info->tx_put = info->tx_get = 0;
1927                 info->tx_aborting = true;
1928         }
1929         spin_unlock_irqrestore(&info->lock, flags);
1930         return 0;
1931 }
1932 
1933 static int set_rxenable(MGSLPC_INFO * info, int enable)
1934 {
1935         unsigned long flags;
1936 
1937         if (debug_level >= DEBUG_LEVEL_INFO)
1938                 printk("set_rxenable(%s,%d)\n", info->device_name, enable);
1939 
1940         spin_lock_irqsave(&info->lock, flags);
1941         if (enable) {
1942                 if (!info->rx_enabled)
1943                         rx_start(info);
1944         } else {
1945                 if (info->rx_enabled)
1946                         rx_stop(info);
1947         }
1948         spin_unlock_irqrestore(&info->lock, flags);
1949         return 0;
1950 }
1951 
1952 /* wait for specified event to occur
1953  *
1954  * Arguments:           info    pointer to device instance data
1955  *                      mask    pointer to bitmask of events to wait for
1956  * Return Value:        0       if successful and bit mask updated with
1957  *                              of events triggerred,
1958  *                      otherwise error code
1959  */
1960 static int wait_events(MGSLPC_INFO * info, int __user *mask_ptr)
1961 {
1962         unsigned long flags;
1963         int s;
1964         int rc=0;
1965         struct mgsl_icount cprev, cnow;
1966         int events;
1967         int mask;
1968         struct  _input_signal_events oldsigs, newsigs;
1969         DECLARE_WAITQUEUE(wait, current);
1970 
1971         COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
1972         if (rc)
1973                 return  -EFAULT;
1974 
1975         if (debug_level >= DEBUG_LEVEL_INFO)
1976                 printk("wait_events(%s,%d)\n", info->device_name, mask);
1977 
1978         spin_lock_irqsave(&info->lock, flags);
1979 
1980         /* return immediately if state matches requested events */
1981         get_signals(info);
1982         s = info->serial_signals;
1983         events = mask &
1984                 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
1985                   ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
1986                   ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
1987                   ((s & SerialSignal_RI)  ? MgslEvent_RiActive :MgslEvent_RiInactive) );
1988         if (events) {
1989                 spin_unlock_irqrestore(&info->lock, flags);
1990                 goto exit;
1991         }
1992 
1993         /* save current irq counts */
1994         cprev = info->icount;
1995         oldsigs = info->input_signal_events;
1996 
1997         if ((info->params.mode == MGSL_MODE_HDLC) &&
1998             (mask & MgslEvent_ExitHuntMode))
1999                 irq_enable(info, CHA, IRQ_EXITHUNT);
2000 
2001         set_current_state(TASK_INTERRUPTIBLE);
2002         add_wait_queue(&info->event_wait_q, &wait);
2003 
2004         spin_unlock_irqrestore(&info->lock, flags);
2005 
2006 
2007         for(;;) {
2008                 schedule();
2009                 if (signal_pending(current)) {
2010                         rc = -ERESTARTSYS;
2011                         break;
2012                 }
2013 
2014                 /* get current irq counts */
2015                 spin_lock_irqsave(&info->lock, flags);
2016                 cnow = info->icount;
2017                 newsigs = info->input_signal_events;
2018                 set_current_state(TASK_INTERRUPTIBLE);
2019                 spin_unlock_irqrestore(&info->lock, flags);
2020 
2021                 /* if no change, wait aborted for some reason */
2022                 if (newsigs.dsr_up   == oldsigs.dsr_up   &&
2023                     newsigs.dsr_down == oldsigs.dsr_down &&
2024                     newsigs.dcd_up   == oldsigs.dcd_up   &&
2025                     newsigs.dcd_down == oldsigs.dcd_down &&
2026                     newsigs.cts_up   == oldsigs.cts_up   &&
2027                     newsigs.cts_down == oldsigs.cts_down &&
2028                     newsigs.ri_up    == oldsigs.ri_up    &&
2029                     newsigs.ri_down  == oldsigs.ri_down  &&
2030                     cnow.exithunt    == cprev.exithunt   &&
2031                     cnow.rxidle      == cprev.rxidle) {
2032                         rc = -EIO;
2033                         break;
2034                 }
2035 
2036                 events = mask &
2037                         ( (newsigs.dsr_up   != oldsigs.dsr_up   ? MgslEvent_DsrActive:0)   +
2038                           (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
2039                           (newsigs.dcd_up   != oldsigs.dcd_up   ? MgslEvent_DcdActive:0)   +
2040                           (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
2041                           (newsigs.cts_up   != oldsigs.cts_up   ? MgslEvent_CtsActive:0)   +
2042                           (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
2043                           (newsigs.ri_up    != oldsigs.ri_up    ? MgslEvent_RiActive:0)    +
2044                           (newsigs.ri_down  != oldsigs.ri_down  ? MgslEvent_RiInactive:0)  +
2045                           (cnow.exithunt    != cprev.exithunt   ? MgslEvent_ExitHuntMode:0) +
2046                           (cnow.rxidle      != cprev.rxidle     ? MgslEvent_IdleReceived:0) );
2047                 if (events)
2048                         break;
2049 
2050                 cprev = cnow;
2051                 oldsigs = newsigs;
2052         }
2053 
2054         remove_wait_queue(&info->event_wait_q, &wait);
2055         set_current_state(TASK_RUNNING);
2056 
2057         if (mask & MgslEvent_ExitHuntMode) {
2058                 spin_lock_irqsave(&info->lock, flags);
2059                 if (!waitqueue_active(&info->event_wait_q))
2060                         irq_disable(info, CHA, IRQ_EXITHUNT);
2061                 spin_unlock_irqrestore(&info->lock, flags);
2062         }
2063 exit:
2064         if (rc == 0)
2065                 PUT_USER(rc, events, mask_ptr);
2066         return rc;
2067 }
2068 
2069 static int modem_input_wait(MGSLPC_INFO *info,int arg)
2070 {
2071         unsigned long flags;
2072         int rc;
2073         struct mgsl_icount cprev, cnow;
2074         DECLARE_WAITQUEUE(wait, current);
2075 
2076         /* save current irq counts */
2077         spin_lock_irqsave(&info->lock, flags);
2078         cprev = info->icount;
2079         add_wait_queue(&info->status_event_wait_q, &wait);
2080         set_current_state(TASK_INTERRUPTIBLE);
2081         spin_unlock_irqrestore(&info->lock, flags);
2082 
2083         for(;;) {
2084                 schedule();
2085                 if (signal_pending(current)) {
2086                         rc = -ERESTARTSYS;
2087                         break;
2088                 }
2089 
2090                 /* get new irq counts */
2091                 spin_lock_irqsave(&info->lock, flags);
2092                 cnow = info->icount;
2093                 set_current_state(TASK_INTERRUPTIBLE);
2094                 spin_unlock_irqrestore(&info->lock, flags);
2095 
2096                 /* if no change, wait aborted for some reason */
2097                 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2098                     cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
2099                         rc = -EIO;
2100                         break;
2101                 }
2102 
2103                 /* check for change in caller specified modem input */
2104                 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
2105                     (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
2106                     (arg & TIOCM_CD  && cnow.dcd != cprev.dcd) ||
2107                     (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
2108                         rc = 0;
2109                         break;
2110                 }
2111 
2112                 cprev = cnow;
2113         }
2114         remove_wait_queue(&info->status_event_wait_q, &wait);
2115         set_current_state(TASK_RUNNING);
2116         return rc;
2117 }
2118 
2119 /* return the state of the serial control and status signals
2120  */
2121 static int tiocmget(struct tty_struct *tty)
2122 {
2123         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
2124         unsigned int result;
2125         unsigned long flags;
2126 
2127         spin_lock_irqsave(&info->lock, flags);
2128         get_signals(info);
2129         spin_unlock_irqrestore(&info->lock, flags);
2130 
2131         result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
2132                 ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
2133                 ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
2134                 ((info->serial_signals & SerialSignal_RI)  ? TIOCM_RNG:0) +
2135                 ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
2136                 ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS:0);
2137 
2138         if (debug_level >= DEBUG_LEVEL_INFO)
2139                 printk("%s(%d):%s tiocmget() value=%08X\n",
2140                          __FILE__, __LINE__, info->device_name, result);
2141         return result;
2142 }
2143 
2144 /* set modem control signals (DTR/RTS)
2145  */
2146 static int tiocmset(struct tty_struct *tty,
2147                     unsigned int set, unsigned int clear)
2148 {
2149         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
2150         unsigned long flags;
2151 
2152         if (debug_level >= DEBUG_LEVEL_INFO)
2153                 printk("%s(%d):%s tiocmset(%x,%x)\n",
2154                         __FILE__, __LINE__, info->device_name, set, clear);
2155 
2156         if (set & TIOCM_RTS)
2157                 info->serial_signals |= SerialSignal_RTS;
2158         if (set & TIOCM_DTR)
2159                 info->serial_signals |= SerialSignal_DTR;
2160         if (clear & TIOCM_RTS)
2161                 info->serial_signals &= ~SerialSignal_RTS;
2162         if (clear & TIOCM_DTR)
2163                 info->serial_signals &= ~SerialSignal_DTR;
2164 
2165         spin_lock_irqsave(&info->lock, flags);
2166         set_signals(info);
2167         spin_unlock_irqrestore(&info->lock, flags);
2168 
2169         return 0;
2170 }
2171 
2172 /* Set or clear transmit break condition
2173  *
2174  * Arguments:           tty             pointer to tty instance data
2175  *                      break_state     -1=set break condition, 0=clear
2176  */
2177 static int mgslpc_break(struct tty_struct *tty, int break_state)
2178 {
2179         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2180         unsigned long flags;
2181 
2182         if (debug_level >= DEBUG_LEVEL_INFO)
2183                 printk("%s(%d):mgslpc_break(%s,%d)\n",
2184                          __FILE__, __LINE__, info->device_name, break_state);
2185 
2186         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_break"))
2187                 return -EINVAL;
2188 
2189         spin_lock_irqsave(&info->lock, flags);
2190         if (break_state == -1)
2191                 set_reg_bits(info, CHA+DAFO, BIT6);
2192         else
2193                 clear_reg_bits(info, CHA+DAFO, BIT6);
2194         spin_unlock_irqrestore(&info->lock, flags);
2195         return 0;
2196 }
2197 
2198 static int mgslpc_get_icount(struct tty_struct *tty,
2199                                 struct serial_icounter_struct *icount)
2200 {
2201         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2202         struct mgsl_icount cnow;        /* kernel counter temps */
2203         unsigned long flags;
2204 
2205         spin_lock_irqsave(&info->lock, flags);
2206         cnow = info->icount;
2207         spin_unlock_irqrestore(&info->lock, flags);
2208 
2209         icount->cts = cnow.cts;
2210         icount->dsr = cnow.dsr;
2211         icount->rng = cnow.rng;
2212         icount->dcd = cnow.dcd;
2213         icount->rx = cnow.rx;
2214         icount->tx = cnow.tx;
2215         icount->frame = cnow.frame;
2216         icount->overrun = cnow.overrun;
2217         icount->parity = cnow.parity;
2218         icount->brk = cnow.brk;
2219         icount->buf_overrun = cnow.buf_overrun;
2220 
2221         return 0;
2222 }
2223 
2224 /* Service an IOCTL request
2225  *
2226  * Arguments:
2227  *
2228  *      tty     pointer to tty instance data
2229  *      cmd     IOCTL command code
2230  *      arg     command argument/context
2231  *
2232  * Return Value:        0 if success, otherwise error code
2233  */
2234 static int mgslpc_ioctl(struct tty_struct *tty,
2235                         unsigned int cmd, unsigned long arg)
2236 {
2237         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2238         void __user *argp = (void __user *)arg;
2239 
2240         if (debug_level >= DEBUG_LEVEL_INFO)
2241                 printk("%s(%d):mgslpc_ioctl %s cmd=%08X\n", __FILE__, __LINE__,
2242                         info->device_name, cmd);
2243 
2244         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_ioctl"))
2245                 return -ENODEV;
2246 
2247         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
2248             (cmd != TIOCMIWAIT)) {
2249                 if (tty->flags & (1 << TTY_IO_ERROR))
2250                     return -EIO;
2251         }
2252 
2253         switch (cmd) {
2254         case MGSL_IOCGPARAMS:
2255                 return get_params(info, argp);
2256         case MGSL_IOCSPARAMS:
2257                 return set_params(info, argp, tty);
2258         case MGSL_IOCGTXIDLE:
2259                 return get_txidle(info, argp);
2260         case MGSL_IOCSTXIDLE:
2261                 return set_txidle(info, (int)arg);
2262         case MGSL_IOCGIF:
2263                 return get_interface(info, argp);
2264         case MGSL_IOCSIF:
2265                 return set_interface(info,(int)arg);
2266         case MGSL_IOCTXENABLE:
2267                 return set_txenable(info,(int)arg, tty);
2268         case MGSL_IOCRXENABLE:
2269                 return set_rxenable(info,(int)arg);
2270         case MGSL_IOCTXABORT:
2271                 return tx_abort(info);
2272         case MGSL_IOCGSTATS:
2273                 return get_stats(info, argp);
2274         case MGSL_IOCWAITEVENT:
2275                 return wait_events(info, argp);
2276         case TIOCMIWAIT:
2277                 return modem_input_wait(info,(int)arg);
2278         default:
2279                 return -ENOIOCTLCMD;
2280         }
2281         return 0;
2282 }
2283 
2284 /* Set new termios settings
2285  *
2286  * Arguments:
2287  *
2288  *      tty             pointer to tty structure
2289  *      termios         pointer to buffer to hold returned old termios
2290  */
2291 static void mgslpc_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
2292 {
2293         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
2294         unsigned long flags;
2295 
2296         if (debug_level >= DEBUG_LEVEL_INFO)
2297                 printk("%s(%d):mgslpc_set_termios %s\n", __FILE__, __LINE__,
2298                         tty->driver->name);
2299 
2300         /* just return if nothing has changed */
2301         if ((tty->termios.c_cflag == old_termios->c_cflag)
2302             && (RELEVANT_IFLAG(tty->termios.c_iflag)
2303                 == RELEVANT_IFLAG(old_termios->c_iflag)))
2304           return;
2305 
2306         mgslpc_change_params(info, tty);
2307 
2308         /* Handle transition to B0 status */
2309         if ((old_termios->c_cflag & CBAUD) && !C_BAUD(tty)) {
2310                 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
2311                 spin_lock_irqsave(&info->lock, flags);
2312                 set_signals(info);
2313                 spin_unlock_irqrestore(&info->lock, flags);
2314         }
2315 
2316         /* Handle transition away from B0 status */
2317         if (!(old_termios->c_cflag & CBAUD) && C_BAUD(tty)) {
2318                 info->serial_signals |= SerialSignal_DTR;
2319                 if (!C_CRTSCTS(tty) || !test_bit(TTY_THROTTLED, &tty->flags))
2320                         info->serial_signals |= SerialSignal_RTS;
2321                 spin_lock_irqsave(&info->lock, flags);
2322                 set_signals(info);
2323                 spin_unlock_irqrestore(&info->lock, flags);
2324         }
2325 
2326         /* Handle turning off CRTSCTS */
2327         if (old_termios->c_cflag & CRTSCTS && !C_CRTSCTS(tty)) {
2328                 tty->hw_stopped = 0;
2329                 tx_release(tty);
2330         }
2331 }
2332 
2333 static void mgslpc_close(struct tty_struct *tty, struct file * filp)
2334 {
2335         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2336         struct tty_port *port = &info->port;
2337 
2338         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_close"))
2339                 return;
2340 
2341         if (debug_level >= DEBUG_LEVEL_INFO)
2342                 printk("%s(%d):mgslpc_close(%s) entry, count=%d\n",
2343                          __FILE__, __LINE__, info->device_name, port->count);
2344 
2345         if (tty_port_close_start(port, tty, filp) == 0)
2346                 goto cleanup;
2347 
2348         if (port->flags & ASYNC_INITIALIZED)
2349                 mgslpc_wait_until_sent(tty, info->timeout);
2350 
2351         mgslpc_flush_buffer(tty);
2352 
2353         tty_ldisc_flush(tty);
2354         shutdown(info, tty);
2355         
2356         tty_port_close_end(port, tty);
2357         tty_port_tty_set(port, NULL);
2358 cleanup:
2359         if (debug_level >= DEBUG_LEVEL_INFO)
2360                 printk("%s(%d):mgslpc_close(%s) exit, count=%d\n", __FILE__, __LINE__,
2361                         tty->driver->name, port->count);
2362 }
2363 
2364 /* Wait until the transmitter is empty.
2365  */
2366 static void mgslpc_wait_until_sent(struct tty_struct *tty, int timeout)
2367 {
2368         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2369         unsigned long orig_jiffies, char_time;
2370 
2371         if (!info)
2372                 return;
2373 
2374         if (debug_level >= DEBUG_LEVEL_INFO)
2375                 printk("%s(%d):mgslpc_wait_until_sent(%s) entry\n",
2376                          __FILE__, __LINE__, info->device_name);
2377 
2378         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_wait_until_sent"))
2379                 return;
2380 
2381         if (!(info->port.flags & ASYNC_INITIALIZED))
2382                 goto exit;
2383 
2384         orig_jiffies = jiffies;
2385 
2386         /* Set check interval to 1/5 of estimated time to
2387          * send a character, and make it at least 1. The check
2388          * interval should also be less than the timeout.
2389          * Note: use tight timings here to satisfy the NIST-PCTS.
2390          */
2391 
2392         if (info->params.data_rate) {
2393                 char_time = info->timeout/(32 * 5);
2394                 if (!char_time)
2395                         char_time++;
2396         } else
2397                 char_time = 1;
2398 
2399         if (timeout)
2400                 char_time = min_t(unsigned long, char_time, timeout);
2401 
2402         if (info->params.mode == MGSL_MODE_HDLC) {
2403                 while (info->tx_active) {
2404                         msleep_interruptible(jiffies_to_msecs(char_time));
2405                         if (signal_pending(current))
2406                                 break;
2407                         if (timeout && time_after(jiffies, orig_jiffies + timeout))
2408                                 break;
2409                 }
2410         } else {
2411                 while ((info->tx_count || info->tx_active) &&
2412                         info->tx_enabled) {
2413                         msleep_interruptible(jiffies_to_msecs(char_time));
2414                         if (signal_pending(current))
2415                                 break;
2416                         if (timeout && time_after(jiffies, orig_jiffies + timeout))
2417                                 break;
2418                 }
2419         }
2420 
2421 exit:
2422         if (debug_level >= DEBUG_LEVEL_INFO)
2423                 printk("%s(%d):mgslpc_wait_until_sent(%s) exit\n",
2424                          __FILE__, __LINE__, info->device_name);
2425 }
2426 
2427 /* Called by tty_hangup() when a hangup is signaled.
2428  * This is the same as closing all open files for the port.
2429  */
2430 static void mgslpc_hangup(struct tty_struct *tty)
2431 {
2432         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2433 
2434         if (debug_level >= DEBUG_LEVEL_INFO)
2435                 printk("%s(%d):mgslpc_hangup(%s)\n",
2436                          __FILE__, __LINE__, info->device_name);
2437 
2438         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_hangup"))
2439                 return;
2440 
2441         mgslpc_flush_buffer(tty);
2442         shutdown(info, tty);
2443         tty_port_hangup(&info->port);
2444 }
2445 
2446 static int carrier_raised(struct tty_port *port)
2447 {
2448         MGSLPC_INFO *info = container_of(port, MGSLPC_INFO, port);
2449         unsigned long flags;
2450 
2451         spin_lock_irqsave(&info->lock, flags);
2452         get_signals(info);
2453         spin_unlock_irqrestore(&info->lock, flags);
2454 
2455         if (info->serial_signals & SerialSignal_DCD)
2456                 return 1;
2457         return 0;
2458 }
2459 
2460 static void dtr_rts(struct tty_port *port, int onoff)
2461 {
2462         MGSLPC_INFO *info = container_of(port, MGSLPC_INFO, port);
2463         unsigned long flags;
2464 
2465         spin_lock_irqsave(&info->lock, flags);
2466         if (onoff)
2467                 info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR;
2468         else
2469                 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
2470         set_signals(info);
2471         spin_unlock_irqrestore(&info->lock, flags);
2472 }
2473 
2474 
2475 static int mgslpc_open(struct tty_struct *tty, struct file * filp)
2476 {
2477         MGSLPC_INFO     *info;
2478         struct tty_port *port;
2479         int             retval, line;
2480         unsigned long   flags;
2481 
2482         /* verify range of specified line number */
2483         line = tty->index;
2484         if (line >= mgslpc_device_count) {
2485                 printk("%s(%d):mgslpc_open with invalid line #%d.\n",
2486                         __FILE__, __LINE__, line);
2487                 return -ENODEV;
2488         }
2489 
2490         /* find the info structure for the specified line */
2491         info = mgslpc_device_list;
2492         while(info && info->line != line)
2493                 info = info->next_device;
2494         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_open"))
2495                 return -ENODEV;
2496 
2497         port = &info->port;
2498         tty->driver_data = info;
2499         tty_port_tty_set(port, tty);
2500 
2501         if (debug_level >= DEBUG_LEVEL_INFO)
2502                 printk("%s(%d):mgslpc_open(%s), old ref count = %d\n",
2503                          __FILE__, __LINE__, tty->driver->name, port->count);
2504 
2505         port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
2506 
2507         spin_lock_irqsave(&info->netlock, flags);
2508         if (info->netcount) {
2509                 retval = -EBUSY;
2510                 spin_unlock_irqrestore(&info->netlock, flags);
2511                 goto cleanup;
2512         }
2513         spin_lock(&port->lock);
2514         port->count++;
2515         spin_unlock(&port->lock);
2516         spin_unlock_irqrestore(&info->netlock, flags);
2517 
2518         if (port->count == 1) {
2519                 /* 1st open on this device, init hardware */
2520                 retval = startup(info, tty);
2521                 if (retval < 0)
2522                         goto cleanup;
2523         }
2524 
2525         retval = tty_port_block_til_ready(&info->port, tty, filp);
2526         if (retval) {
2527                 if (debug_level >= DEBUG_LEVEL_INFO)
2528                         printk("%s(%d):block_til_ready(%s) returned %d\n",
2529                                  __FILE__, __LINE__, info->device_name, retval);
2530                 goto cleanup;
2531         }
2532 
2533         if (debug_level >= DEBUG_LEVEL_INFO)
2534                 printk("%s(%d):mgslpc_open(%s) success\n",
2535                          __FILE__, __LINE__, info->device_name);
2536         retval = 0;
2537 
2538 cleanup:
2539         return retval;
2540 }
2541 
2542 /*
2543  * /proc fs routines....
2544  */
2545 
2546 static inline void line_info(struct seq_file *m, MGSLPC_INFO *info)
2547 {
2548         char    stat_buf[30];
2549         unsigned long flags;
2550 
2551         seq_printf(m, "%s:io:%04X irq:%d",
2552                       info->device_name, info->io_base, info->irq_level);
2553 
2554         /* output current serial signal states */
2555         spin_lock_irqsave(&info->lock, flags);
2556         get_signals(info);
2557         spin_unlock_irqrestore(&info->lock, flags);
2558 
2559         stat_buf[0] = 0;
2560         stat_buf[1] = 0;
2561         if (info->serial_signals & SerialSignal_RTS)
2562                 strcat(stat_buf, "|RTS");
2563         if (info->serial_signals & SerialSignal_CTS)
2564                 strcat(stat_buf, "|CTS");
2565         if (info->serial_signals & SerialSignal_DTR)
2566                 strcat(stat_buf, "|DTR");
2567         if (info->serial_signals & SerialSignal_DSR)
2568                 strcat(stat_buf, "|DSR");
2569         if (info->serial_signals & SerialSignal_DCD)
2570                 strcat(stat_buf, "|CD");
2571         if (info->serial_signals & SerialSignal_RI)
2572                 strcat(stat_buf, "|RI");
2573 
2574         if (info->params.mode == MGSL_MODE_HDLC) {
2575                 seq_printf(m, " HDLC txok:%d rxok:%d",
2576                               info->icount.txok, info->icount.rxok);
2577                 if (info->icount.txunder)
2578                         seq_printf(m, " txunder:%d", info->icount.txunder);
2579                 if (info->icount.txabort)
2580                         seq_printf(m, " txabort:%d", info->icount.txabort);
2581                 if (info->icount.rxshort)
2582                         seq_printf(m, " rxshort:%d", info->icount.rxshort);
2583                 if (info->icount.rxlong)
2584                         seq_printf(m, " rxlong:%d", info->icount.rxlong);
2585                 if (info->icount.rxover)
2586                         seq_printf(m, " rxover:%d", info->icount.rxover);
2587                 if (info->icount.rxcrc)
2588                         seq_printf(m, " rxcrc:%d", info->icount.rxcrc);
2589         } else {
2590                 seq_printf(m, " ASYNC tx:%d rx:%d",
2591                               info->icount.tx, info->icount.rx);
2592                 if (info->icount.frame)
2593                         seq_printf(m, " fe:%d", info->icount.frame);
2594                 if (info->icount.parity)
2595                         seq_printf(m, " pe:%d", info->icount.parity);
2596                 if (info->icount.brk)
2597                         seq_printf(m, " brk:%d", info->icount.brk);
2598                 if (info->icount.overrun)
2599                         seq_printf(m, " oe:%d", info->icount.overrun);
2600         }
2601 
2602         /* Append serial signal status to end */
2603         seq_printf(m, " %s\n", stat_buf+1);
2604 
2605         seq_printf(m, "txactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
2606                        info->tx_active,info->bh_requested,info->bh_running,
2607                        info->pending_bh);
2608 }
2609 
2610 /* Called to print information about devices
2611  */
2612 static int mgslpc_proc_show(struct seq_file *m, void *v)
2613 {
2614         MGSLPC_INFO *info;
2615 
2616         seq_printf(m, "synclink driver:%s\n", driver_version);
2617 
2618         info = mgslpc_device_list;
2619         while (info) {
2620                 line_info(m, info);
2621                 info = info->next_device;
2622         }
2623         return 0;
2624 }
2625 
2626 static int mgslpc_proc_open(struct inode *inode, struct file *file)
2627 {
2628         return single_open(file, mgslpc_proc_show, NULL);
2629 }
2630 
2631 static const struct file_operations mgslpc_proc_fops = {
2632         .owner          = THIS_MODULE,
2633         .open           = mgslpc_proc_open,
2634         .read           = seq_read,
2635         .llseek         = seq_lseek,
2636         .release        = single_release,
2637 };
2638 
2639 static int rx_alloc_buffers(MGSLPC_INFO *info)
2640 {
2641         /* each buffer has header and data */
2642         info->rx_buf_size = sizeof(RXBUF) + info->max_frame_size;
2643 
2644         /* calculate total allocation size for 8 buffers */
2645         info->rx_buf_total_size = info->rx_buf_size * 8;
2646 
2647         /* limit total allocated memory */
2648         if (info->rx_buf_total_size > 0x10000)
2649                 info->rx_buf_total_size = 0x10000;
2650 
2651         /* calculate number of buffers */
2652         info->rx_buf_count = info->rx_buf_total_size / info->rx_buf_size;
2653 
2654         info->rx_buf = kmalloc(info->rx_buf_total_size, GFP_KERNEL);
2655         if (info->rx_buf == NULL)
2656                 return -ENOMEM;
2657 
2658         /* unused flag buffer to satisfy receive_buf calling interface */
2659         info->flag_buf = kzalloc(info->max_frame_size, GFP_KERNEL);
2660         if (!info->flag_buf) {
2661                 kfree(info->rx_buf);
2662                 info->rx_buf = NULL;
2663                 return -ENOMEM;
2664         }
2665         
2666         rx_reset_buffers(info);
2667         return 0;
2668 }
2669 
2670 static void rx_free_buffers(MGSLPC_INFO *info)
2671 {
2672         kfree(info->rx_buf);
2673         info->rx_buf = NULL;
2674         kfree(info->flag_buf);
2675         info->flag_buf = NULL;
2676 }
2677 
2678 static int claim_resources(MGSLPC_INFO *info)
2679 {
2680         if (rx_alloc_buffers(info) < 0) {
2681                 printk("Can't allocate rx buffer %s\n", info->device_name);
2682                 release_resources(info);
2683                 return -ENODEV;
2684         }
2685         return 0;
2686 }
2687 
2688 static void release_resources(MGSLPC_INFO *info)
2689 {
2690         if (debug_level >= DEBUG_LEVEL_INFO)
2691                 printk("release_resources(%s)\n", info->device_name);
2692         rx_free_buffers(info);
2693 }
2694 
2695 /* Add the specified device instance data structure to the
2696  * global linked list of devices and increment the device count.
2697  *
2698  * Arguments:           info    pointer to device instance data
2699  */
2700 static int mgslpc_add_device(MGSLPC_INFO *info)
2701 {
2702         MGSLPC_INFO *current_dev = NULL;
2703         struct device *tty_dev;
2704         int ret;
2705 
2706         info->next_device = NULL;
2707         info->line = mgslpc_device_count;
2708         sprintf(info->device_name,"ttySLP%d",info->line);
2709 
2710         if (info->line < MAX_DEVICE_COUNT) {
2711                 if (maxframe[info->line])
2712                         info->max_frame_size = maxframe[info->line];
2713         }
2714 
2715         mgslpc_device_count++;
2716 
2717         if (!mgslpc_device_list)
2718                 mgslpc_device_list = info;
2719         else {
2720                 current_dev = mgslpc_device_list;
2721                 while (current_dev->next_device)
2722                         current_dev = current_dev->next_device;
2723                 current_dev->next_device = info;
2724         }
2725 
2726         if (info->max_frame_size < 4096)
2727                 info->max_frame_size = 4096;
2728         else if (info->max_frame_size > 65535)
2729                 info->max_frame_size = 65535;
2730 
2731         printk("SyncLink PC Card %s:IO=%04X IRQ=%d\n",
2732                 info->device_name, info->io_base, info->irq_level);
2733 
2734 #if SYNCLINK_GENERIC_HDLC
2735         ret = hdlcdev_init(info);
2736         if (ret != 0)
2737                 goto failed;
2738 #endif
2739 
2740         tty_dev = tty_port_register_device(&info->port, serial_driver, info->line,
2741                         &info->p_dev->dev);
2742         if (IS_ERR(tty_dev)) {
2743                 ret = PTR_ERR(tty_dev);
2744 #if SYNCLINK_GENERIC_HDLC
2745                 hdlcdev_exit(info);
2746 #endif
2747                 goto failed;
2748         }
2749 
2750         return 0;
2751 
2752 failed:
2753         if (current_dev)
2754                 current_dev->next_device = NULL;
2755         else
2756                 mgslpc_device_list = NULL;
2757         mgslpc_device_count--;
2758         return ret;
2759 }
2760 
2761 static void mgslpc_remove_device(MGSLPC_INFO *remove_info)
2762 {
2763         MGSLPC_INFO *info = mgslpc_device_list;
2764         MGSLPC_INFO *last = NULL;
2765 
2766         while(info) {
2767                 if (info == remove_info) {
2768                         if (last)
2769                                 last->next_device = info->next_device;
2770                         else
2771                                 mgslpc_device_list = info->next_device;
2772                         tty_unregister_device(serial_driver, info->line);
2773 #if SYNCLINK_GENERIC_HDLC
2774                         hdlcdev_exit(info);
2775 #endif
2776                         release_resources(info);
2777                         tty_port_destroy(&info->port);
2778                         kfree(info);
2779                         mgslpc_device_count--;
2780                         return;
2781                 }
2782                 last = info;
2783                 info = info->next_device;
2784         }
2785 }
2786 
2787 static const struct pcmcia_device_id mgslpc_ids[] = {
2788         PCMCIA_DEVICE_MANF_CARD(0x02c5, 0x0050),
2789         PCMCIA_DEVICE_NULL
2790 };
2791 MODULE_DEVICE_TABLE(pcmcia, mgslpc_ids);
2792 
2793 static struct pcmcia_driver mgslpc_driver = {
2794         .owner          = THIS_MODULE,
2795         .name           = "synclink_cs",
2796         .probe          = mgslpc_probe,
2797         .remove         = mgslpc_detach,
2798         .id_table       = mgslpc_ids,
2799         .suspend        = mgslpc_suspend,
2800         .resume         = mgslpc_resume,
2801 };
2802 
2803 static const struct tty_operations mgslpc_ops = {
2804         .open = mgslpc_open,
2805         .close = mgslpc_close,
2806         .write = mgslpc_write,
2807         .put_char = mgslpc_put_char,
2808         .flush_chars = mgslpc_flush_chars,
2809         .write_room = mgslpc_write_room,
2810         .chars_in_buffer = mgslpc_chars_in_buffer,
2811         .flush_buffer = mgslpc_flush_buffer,
2812         .ioctl = mgslpc_ioctl,
2813         .throttle = mgslpc_throttle,
2814         .unthrottle = mgslpc_unthrottle,
2815         .send_xchar = mgslpc_send_xchar,
2816         .break_ctl = mgslpc_break,
2817         .wait_until_sent = mgslpc_wait_until_sent,
2818         .set_termios = mgslpc_set_termios,
2819         .stop = tx_pause,
2820         .start = tx_release,
2821         .hangup = mgslpc_hangup,
2822         .tiocmget = tiocmget,
2823         .tiocmset = tiocmset,
2824         .get_icount = mgslpc_get_icount,
2825         .proc_fops = &mgslpc_proc_fops,
2826 };
2827 
2828 static int __init synclink_cs_init(void)
2829 {
2830         int rc;
2831 
2832         if (break_on_load) {
2833                 mgslpc_get_text_ptr();
2834                 BREAKPOINT();
2835         }
2836 
2837         serial_driver = tty_alloc_driver(MAX_DEVICE_COUNT,
2838                         TTY_DRIVER_REAL_RAW |
2839                         TTY_DRIVER_DYNAMIC_DEV);
2840         if (IS_ERR(serial_driver)) {
2841                 rc = PTR_ERR(serial_driver);
2842                 goto err;
2843         }
2844 
2845         /* Initialize the tty_driver structure */
2846         serial_driver->driver_name = "synclink_cs";
2847         serial_driver->name = "ttySLP";
2848         serial_driver->major = ttymajor;
2849         serial_driver->minor_start = 64;
2850         serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
2851         serial_driver->subtype = SERIAL_TYPE_NORMAL;
2852         serial_driver->init_termios = tty_std_termios;
2853         serial_driver->init_termios.c_cflag =
2854         B9600 | CS8 | CREAD | HUPCL | CLOCAL;
2855         tty_set_operations(serial_driver, &mgslpc_ops);
2856 
2857         rc = tty_register_driver(serial_driver);
2858         if (rc < 0) {
2859                 printk(KERN_ERR "%s(%d):Couldn't register serial driver\n",
2860                                 __FILE__, __LINE__);
2861                 goto err_put_tty;
2862         }
2863 
2864         rc = pcmcia_register_driver(&mgslpc_driver);
2865         if (rc < 0)
2866                 goto err_unreg_tty;
2867 
2868         printk(KERN_INFO "%s %s, tty major#%d\n", driver_name, driver_version,
2869                         serial_driver->major);
2870 
2871         return 0;
2872 err_unreg_tty:
2873         tty_unregister_driver(serial_driver);
2874 err_put_tty:
2875         put_tty_driver(serial_driver);
2876 err:
2877         return rc;
2878 }
2879 
2880 static void __exit synclink_cs_exit(void)
2881 {
2882         pcmcia_unregister_driver(&mgslpc_driver);
2883         tty_unregister_driver(serial_driver);
2884         put_tty_driver(serial_driver);
2885 }
2886 
2887 module_init(synclink_cs_init);
2888 module_exit(synclink_cs_exit);
2889 
2890 static void mgslpc_set_rate(MGSLPC_INFO *info, unsigned char channel, unsigned int rate)
2891 {
2892         unsigned int M, N;
2893         unsigned char val;
2894 
2895         /* note:standard BRG mode is broken in V3.2 chip
2896          * so enhanced mode is always used
2897          */
2898 
2899         if (rate) {
2900                 N = 3686400 / rate;
2901                 if (!N)
2902                         N = 1;
2903                 N >>= 1;
2904                 for (M = 1; N > 64 && M < 16; M++)
2905                         N >>= 1;
2906                 N--;
2907 
2908                 /* BGR[5..0] = N
2909                  * BGR[9..6] = M
2910                  * BGR[7..0] contained in BGR register
2911                  * BGR[9..8] contained in CCR2[7..6]
2912                  * divisor = (N+1)*2^M
2913                  *
2914                  * Note: M *must* not be zero (causes asymetric duty cycle)
2915                  */
2916                 write_reg(info, (unsigned char) (channel + BGR),
2917                                   (unsigned char) ((M << 6) + N));
2918                 val = read_reg(info, (unsigned char) (channel + CCR2)) & 0x3f;
2919                 val |= ((M << 4) & 0xc0);
2920                 write_reg(info, (unsigned char) (channel + CCR2), val);
2921         }
2922 }
2923 
2924 /* Enabled the AUX clock output at the specified frequency.
2925  */
2926 static void enable_auxclk(MGSLPC_INFO *info)
2927 {
2928         unsigned char val;
2929 
2930         /* MODE
2931          *
2932          * 07..06  MDS[1..0] 10 = transparent HDLC mode
2933          * 05      ADM Address Mode, 0 = no addr recognition
2934          * 04      TMD Timer Mode, 0 = external
2935          * 03      RAC Receiver Active, 0 = inactive
2936          * 02      RTS 0=RTS active during xmit, 1=RTS always active
2937          * 01      TRS Timer Resolution, 1=512
2938          * 00      TLP Test Loop, 0 = no loop
2939          *
2940          * 1000 0010
2941          */
2942         val = 0x82;
2943 
2944         /* channel B RTS is used to enable AUXCLK driver on SP505 */
2945         if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
2946                 val |= BIT2;
2947         write_reg(info, CHB + MODE, val);
2948 
2949         /* CCR0
2950          *
2951          * 07      PU Power Up, 1=active, 0=power down
2952          * 06      MCE Master Clock Enable, 1=enabled
2953          * 05      Reserved, 0
2954          * 04..02  SC[2..0] Encoding
2955          * 01..00  SM[1..0] Serial Mode, 00=HDLC
2956          *
2957          * 11000000
2958          */
2959         write_reg(info, CHB + CCR0, 0xc0);
2960 
2961         /* CCR1
2962          *
2963          * 07      SFLG Shared Flag, 0 = disable shared flags
2964          * 06      GALP Go Active On Loop, 0 = not used
2965          * 05      GLP Go On Loop, 0 = not used
2966          * 04      ODS Output Driver Select, 1=TxD is push-pull output
2967          * 03      ITF Interframe Time Fill, 0=mark, 1=flag
2968          * 02..00  CM[2..0] Clock Mode
2969          *
2970          * 0001 0111
2971          */
2972         write_reg(info, CHB + CCR1, 0x17);
2973 
2974         /* CCR2 (Channel B)
2975          *
2976          * 07..06  BGR[9..8] Baud rate bits 9..8
2977          * 05      BDF Baud rate divisor factor, 0=1, 1=BGR value
2978          * 04      SSEL Clock source select, 1=submode b
2979          * 03      TOE 0=TxCLK is input, 1=TxCLK is output
2980          * 02      RWX Read/Write Exchange 0=disabled
2981          * 01      C32, CRC select, 0=CRC-16, 1=CRC-32
2982          * 00      DIV, data inversion 0=disabled, 1=enabled
2983          *
2984          * 0011 1000
2985          */
2986         if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
2987                 write_reg(info, CHB + CCR2, 0x38);
2988         else
2989                 write_reg(info, CHB + CCR2, 0x30);
2990 
2991         /* CCR4
2992          *
2993          * 07      MCK4 Master Clock Divide by 4, 1=enabled
2994          * 06      EBRG Enhanced Baud Rate Generator Mode, 1=enabled
2995          * 05      TST1 Test Pin, 0=normal operation
2996          * 04      ICD Ivert Carrier Detect, 1=enabled (active low)
2997          * 03..02  Reserved, must be 0
2998          * 01..00  RFT[1..0] RxFIFO Threshold 00=32 bytes
2999          *
3000          * 0101 0000
3001          */
3002         write_reg(info, CHB + CCR4, 0x50);
3003 
3004         /* if auxclk not enabled, set internal BRG so
3005          * CTS transitions can be detected (requires TxC)
3006          */
3007         if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
3008                 mgslpc_set_rate(info, CHB, info->params.clock_speed);
3009         else
3010                 mgslpc_set_rate(info, CHB, 921600);
3011 }
3012 
3013 static void loopback_enable(MGSLPC_INFO *info)
3014 {
3015         unsigned char val;
3016 
3017         /* CCR1:02..00  CM[2..0] Clock Mode = 111 (clock mode 7) */
3018         val = read_reg(info, CHA + CCR1) | (BIT2 | BIT1 | BIT0);
3019         write_reg(info, CHA + CCR1, val);
3020 
3021         /* CCR2:04 SSEL Clock source select, 1=submode b */
3022         val = read_reg(info, CHA + CCR2) | (BIT4 | BIT5);
3023         write_reg(info, CHA + CCR2, val);
3024 
3025         /* set LinkSpeed if available, otherwise default to 2Mbps */
3026         if (info->params.clock_speed)
3027                 mgslpc_set_rate(info, CHA, info->params.clock_speed);
3028         else
3029                 mgslpc_set_rate(info, CHA, 1843200);
3030 
3031         /* MODE:00 TLP Test Loop, 1=loopback enabled */
3032         val = read_reg(info, CHA + MODE) | BIT0;
3033         write_reg(info, CHA + MODE, val);
3034 }
3035 
3036 static void hdlc_mode(MGSLPC_INFO *info)
3037 {
3038         unsigned char val;
3039         unsigned char clkmode, clksubmode;
3040 
3041         /* disable all interrupts */
3042         irq_disable(info, CHA, 0xffff);
3043         irq_disable(info, CHB, 0xffff);
3044         port_irq_disable(info, 0xff);
3045 
3046         /* assume clock mode 0a, rcv=RxC xmt=TxC */
3047         clkmode = clksubmode = 0;
3048         if (info->params.flags & HDLC_FLAG_RXC_DPLL
3049             && info->params.flags & HDLC_FLAG_TXC_DPLL) {
3050                 /* clock mode 7a, rcv = DPLL, xmt = DPLL */
3051                 clkmode = 7;
3052         } else if (info->params.flags & HDLC_FLAG_RXC_BRG
3053                  && info->params.flags & HDLC_FLAG_TXC_BRG) {
3054                 /* clock mode 7b, rcv = BRG, xmt = BRG */
3055                 clkmode = 7;
3056                 clksubmode = 1;
3057         } else if (info->params.flags & HDLC_FLAG_RXC_DPLL) {
3058                 if (info->params.flags & HDLC_FLAG_TXC_BRG) {
3059                         /* clock mode 6b, rcv = DPLL, xmt = BRG/16 */
3060                         clkmode = 6;
3061                         clksubmode = 1;
3062                 } else {
3063                         /* clock mode 6a, rcv = DPLL, xmt = TxC */
3064                         clkmode = 6;
3065                 }
3066         } else if (info->params.flags & HDLC_FLAG_TXC_BRG) {
3067                 /* clock mode 0b, rcv = RxC, xmt = BRG */
3068                 clksubmode = 1;
3069         }
3070 
3071         /* MODE
3072          *
3073          * 07..06  MDS[1..0] 10 = transparent HDLC mode
3074          * 05      ADM Address Mode, 0 = no addr recognition
3075          * 04      TMD Timer Mode, 0 = external
3076          * 03      RAC Receiver Active, 0 = inactive
3077          * 02      RTS 0=RTS active during xmit, 1=RTS always active
3078          * 01      TRS Timer Resolution, 1=512
3079          * 00      TLP Test Loop, 0 = no loop
3080          *
3081          * 1000 0010
3082          */
3083         val = 0x82;
3084         if (info->params.loopback)
3085                 val |= BIT0;
3086 
3087         /* preserve RTS state */
3088         if (info->serial_signals & SerialSignal_RTS)
3089                 val |= BIT2;
3090         write_reg(info, CHA + MODE, val);
3091 
3092         /* CCR0
3093          *
3094          * 07      PU Power Up, 1=active, 0=power down
3095          * 06      MCE Master Clock Enable, 1=enabled
3096          * 05      Reserved, 0
3097          * 04..02  SC[2..0] Encoding
3098          * 01..00  SM[1..0] Serial Mode, 00=HDLC
3099          *
3100          * 11000000
3101          */
3102         val = 0xc0;
3103         switch (info->params.encoding)
3104         {
3105         case HDLC_ENCODING_NRZI:
3106                 val |= BIT3;
3107                 break;
3108         case HDLC_ENCODING_BIPHASE_SPACE:
3109                 val |= BIT4;
3110                 break;          // FM0
3111         case HDLC_ENCODING_BIPHASE_MARK:
3112                 val |= BIT4 | BIT2;
3113                 break;          // FM1
3114         case HDLC_ENCODING_BIPHASE_LEVEL:
3115                 val |= BIT4 | BIT3;
3116                 break;          // Manchester
3117         }
3118         write_reg(info, CHA + CCR0, val);
3119 
3120         /* CCR1
3121          *
3122          * 07      SFLG Shared Flag, 0 = disable shared flags
3123          * 06      GALP Go Active On Loop, 0 = not used
3124          * 05      GLP Go On Loop, 0 = not used
3125          * 04      ODS Output Driver Select, 1=TxD is push-pull output
3126          * 03      ITF Interframe Time Fill, 0=mark, 1=flag
3127          * 02..00  CM[2..0] Clock Mode
3128          *
3129          * 0001 0000
3130          */
3131         val = 0x10 + clkmode;
3132         write_reg(info, CHA + CCR1, val);
3133 
3134         /* CCR2
3135          *
3136          * 07..06  BGR[9..8] Baud rate bits 9..8
3137          * 05      BDF Baud rate divisor factor, 0=1, 1=BGR value
3138          * 04      SSEL Clock source select, 1=submode b
3139          * 03      TOE 0=TxCLK is input, 0=TxCLK is input
3140          * 02      RWX Read/Write Exchange 0=disabled
3141          * 01      C32, CRC select, 0=CRC-16, 1=CRC-32
3142          * 00      DIV, data inversion 0=disabled, 1=enabled
3143          *
3144          * 0000 0000
3145          */
3146         val = 0x00;
3147         if (clkmode == 2 || clkmode == 3 || clkmode == 6
3148             || clkmode == 7 || (clkmode == 0 && clksubmode == 1))
3149                 val |= BIT5;
3150         if (clksubmode)
3151                 val |= BIT4;
3152         if (info->params.crc_type == HDLC_CRC_32_CCITT)
3153                 val |= BIT1;
3154         if (info->params.encoding == HDLC_ENCODING_NRZB)
3155                 val |= BIT0;
3156         write_reg(info, CHA + CCR2, val);
3157 
3158         /* CCR3
3159          *
3160          * 07..06  PRE[1..0] Preamble count 00=1, 01=2, 10=4, 11=8
3161          * 05      EPT Enable preamble transmission, 1=enabled
3162          * 04      RADD Receive address pushed to FIFO, 0=disabled
3163          * 03      CRL CRC Reset Level, 0=FFFF
3164          * 02      RCRC Rx CRC 0=On 1=Off
3165          * 01      TCRC Tx CRC 0=On 1=Off
3166          * 00      PSD DPLL Phase Shift Disable
3167          *
3168          * 0000 0000
3169          */
3170         val = 0x00;
3171         if (info->params.crc_type == HDLC_CRC_NONE)
3172                 val |= BIT2 | BIT1;
3173         if (info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE)
3174                 val |= BIT5;
3175         switch (info->params.preamble_length)
3176         {
3177         case HDLC_PREAMBLE_LENGTH_16BITS:
3178                 val |= BIT6;
3179                 break;
3180         case HDLC_PREAMBLE_LENGTH_32BITS:
3181                 val |= BIT6;
3182                 break;
3183         case HDLC_PREAMBLE_LENGTH_64BITS:
3184                 val |= BIT7 | BIT6;
3185                 break;
3186         }
3187         write_reg(info, CHA + CCR3, val);
3188 
3189         /* PRE - Preamble pattern */
3190         val = 0;
3191         switch (info->params.preamble)
3192         {
3193         case HDLC_PREAMBLE_PATTERN_FLAGS: val = 0x7e; break;
3194         case HDLC_PREAMBLE_PATTERN_10:    val = 0xaa; break;
3195         case HDLC_PREAMBLE_PATTERN_01:    val = 0x55; break;
3196         case HDLC_PREAMBLE_PATTERN_ONES:  val = 0xff; break;
3197         }
3198         write_reg(info, CHA + PRE, val);
3199 
3200         /* CCR4
3201          *
3202          * 07      MCK4 Master Clock Divide by 4, 1=enabled
3203          * 06      EBRG Enhanced Baud Rate Generator Mode, 1=enabled
3204          * 05      TST1 Test Pin, 0=normal operation
3205          * 04      ICD Ivert Carrier Detect, 1=enabled (active low)
3206          * 03..02  Reserved, must be 0
3207          * 01..00  RFT[1..0] RxFIFO Threshold 00=32 bytes
3208          *
3209          * 0101 0000
3210          */
3211         val = 0x50;
3212         write_reg(info, CHA + CCR4, val);
3213         if (info->params.flags & HDLC_FLAG_RXC_DPLL)
3214                 mgslpc_set_rate(info, CHA, info->params.clock_speed * 16);
3215         else
3216                 mgslpc_set_rate(info, CHA, info->params.clock_speed);
3217 
3218         /* RLCR Receive length check register
3219          *
3220          * 7     1=enable receive length check
3221          * 6..0  Max frame length = (RL + 1) * 32
3222          */
3223         write_reg(info, CHA + RLCR, 0);
3224 
3225         /* XBCH Transmit Byte Count High
3226          *
3227          * 07      DMA mode, 0 = interrupt driven
3228          * 06      NRM, 0=ABM (ignored)
3229          * 05      CAS Carrier Auto Start
3230          * 04      XC Transmit Continuously (ignored)
3231          * 03..00  XBC[10..8] Transmit byte count bits 10..8
3232          *
3233          * 0000 0000
3234          */
3235         val = 0x00;
3236         if (info->params.flags & HDLC_FLAG_AUTO_DCD)
3237                 val |= BIT5;
3238         write_reg(info, CHA + XBCH, val);
3239         enable_auxclk(info);
3240         if (info->params.loopback || info->testing_irq)
3241                 loopback_enable(info);
3242         if (info->params.flags & HDLC_FLAG_AUTO_CTS)
3243         {
3244                 irq_enable(info, CHB, IRQ_CTS);
3245                 /* PVR[3] 1=AUTO CTS active */
3246                 set_reg_bits(info, CHA + PVR, BIT3);
3247         } else
3248                 clear_reg_bits(info, CHA + PVR, BIT3);
3249 
3250         irq_enable(info, CHA,
3251                          IRQ_RXEOM | IRQ_RXFIFO | IRQ_ALLSENT |
3252                          IRQ_UNDERRUN | IRQ_TXFIFO);
3253         issue_command(info, CHA, CMD_TXRESET + CMD_RXRESET);
3254         wait_command_complete(info, CHA);
3255         read_reg16(info, CHA + ISR);    /* clear pending IRQs */
3256 
3257         /* Master clock mode enabled above to allow reset commands
3258          * to complete even if no data clocks are present.
3259          *
3260          * Disable master clock mode for normal communications because
3261          * V3.2 of the ESCC2 has a bug that prevents the transmit all sent
3262          * IRQ when in master clock mode.
3263          *
3264          * Leave master clock mode enabled for IRQ test because the
3265          * timer IRQ used by the test can only happen in master clock mode.
3266          */
3267         if (!info->testing_irq)
3268                 clear_reg_bits(info, CHA + CCR0, BIT6);
3269 
3270         tx_set_idle(info);
3271 
3272         tx_stop(info);
3273         rx_stop(info);
3274 }
3275 
3276 static void rx_stop(MGSLPC_INFO *info)
3277 {
3278         if (debug_level >= DEBUG_LEVEL_ISR)
3279                 printk("%s(%d):rx_stop(%s)\n",
3280                          __FILE__, __LINE__, info->device_name);
3281 
3282         /* MODE:03 RAC Receiver Active, 0=inactive */
3283         clear_reg_bits(info, CHA + MODE, BIT3);
3284 
3285         info->rx_enabled = false;
3286         info->rx_overflow = false;
3287 }
3288 
3289 static void rx_start(MGSLPC_INFO *info)
3290 {
3291         if (debug_level >= DEBUG_LEVEL_ISR)
3292                 printk("%s(%d):rx_start(%s)\n",
3293                          __FILE__, __LINE__, info->device_name);
3294 
3295         rx_reset_buffers(info);
3296         info->rx_enabled = false;
3297         info->rx_overflow = false;
3298 
3299         /* MODE:03 RAC Receiver Active, 1=active */
3300         set_reg_bits(info, CHA + MODE, BIT3);
3301 
3302         info->rx_enabled = true;
3303 }
3304 
3305 static void tx_start(MGSLPC_INFO *info, struct tty_struct *tty)
3306 {
3307         if (debug_level >= DEBUG_LEVEL_ISR)
3308                 printk("%s(%d):tx_start(%s)\n",
3309                          __FILE__, __LINE__, info->device_name);
3310 
3311         if (info->tx_count) {
3312                 /* If auto RTS enabled and RTS is inactive, then assert */
3313                 /* RTS and set a flag indicating that the driver should */
3314                 /* negate RTS when the transmission completes. */
3315                 info->drop_rts_on_tx_done = false;
3316 
3317                 if (info->params.flags & HDLC_FLAG_AUTO_RTS) {
3318                         get_signals(info);
3319                         if (!(info->serial_signals & SerialSignal_RTS)) {
3320                                 info->serial_signals |= SerialSignal_RTS;
3321                                 set_signals(info);
3322                                 info->drop_rts_on_tx_done = true;
3323                         }
3324                 }
3325 
3326                 if (info->params.mode == MGSL_MODE_ASYNC) {
3327                         if (!info->tx_active) {
3328                                 info->tx_active = true;
3329                                 tx_ready(info, tty);
3330                         }
3331                 } else {
3332                         info->tx_active = true;
3333                         tx_ready(info, tty);
3334                         mod_timer(&info->tx_timer, jiffies +
3335                                         msecs_to_jiffies(5000));
3336                 }
3337         }
3338 
3339         if (!info->tx_enabled)
3340                 info->tx_enabled = true;
3341 }
3342 
3343 static void tx_stop(MGSLPC_INFO *info)
3344 {
3345         if (debug_level >= DEBUG_LEVEL_ISR)
3346                 printk("%s(%d):tx_stop(%s)\n",
3347                          __FILE__, __LINE__, info->device_name);
3348 
3349         del_timer(&info->tx_timer);
3350 
3351         info->tx_enabled = false;
3352         info->tx_active = false;
3353 }
3354 
3355 /* Reset the adapter to a known state and prepare it for further use.
3356  */
3357 static void reset_device(MGSLPC_INFO *info)
3358 {
3359         /* power up both channels (set BIT7) */
3360         write_reg(info, CHA + CCR0, 0x80);
3361         write_reg(info, CHB + CCR0, 0x80);
3362         write_reg(info, CHA + MODE, 0);
3363         write_reg(info, CHB + MODE, 0);
3364 
3365         /* disable all interrupts */
3366         irq_disable(info, CHA, 0xffff);
3367         irq_disable(info, CHB, 0xffff);
3368         port_irq_disable(info, 0xff);
3369 
3370         /* PCR Port Configuration Register
3371          *
3372          * 07..04  DEC[3..0] Serial I/F select outputs
3373          * 03      output, 1=AUTO CTS control enabled
3374          * 02      RI Ring Indicator input 0=active
3375          * 01      DSR input 0=active
3376          * 00      DTR output 0=active
3377          *
3378          * 0000 0110
3379          */
3380         write_reg(info, PCR, 0x06);
3381 
3382         /* PVR Port Value Register
3383          *
3384          * 07..04  DEC[3..0] Serial I/F select (0000=disabled)
3385          * 03      AUTO CTS output 1=enabled
3386          * 02      RI Ring Indicator input
3387          * 01      DSR input
3388          * 00      DTR output (1=inactive)
3389          *
3390          * 0000 0001
3391          */
3392 //      write_reg(info, PVR, PVR_DTR);
3393 
3394         /* IPC Interrupt Port Configuration
3395          *
3396          * 07      VIS 1=Masked interrupts visible
3397          * 06..05  Reserved, 0
3398          * 04..03  SLA Slave address, 00 ignored
3399          * 02      CASM Cascading Mode, 1=daisy chain
3400          * 01..00  IC[1..0] Interrupt Config, 01=push-pull output, active low
3401          *
3402          * 0000 0101
3403          */
3404         write_reg(info, IPC, 0x05);
3405 }
3406 
3407 static void async_mode(MGSLPC_INFO *info)
3408 {
3409         unsigned char val;
3410 
3411         /* disable all interrupts */
3412         irq_disable(info, CHA, 0xffff);
3413         irq_disable(info, CHB, 0xffff);
3414         port_irq_disable(info, 0xff);
3415 
3416         /* MODE
3417          *
3418          * 07      Reserved, 0
3419          * 06      FRTS RTS State, 0=active
3420          * 05      FCTS Flow Control on CTS
3421          * 04      FLON Flow Control Enable
3422          * 03      RAC Receiver Active, 0 = inactive
3423          * 02      RTS 0=Auto RTS, 1=manual RTS
3424          * 01      TRS Timer Resolution, 1=512
3425          * 00      TLP Test Loop, 0 = no loop
3426          *
3427          * 0000 0110
3428          */
3429         val = 0x06;
3430         if (info->params.loopback)
3431                 val |= BIT0;
3432 
3433         /* preserve RTS state */
3434         if (!(info->serial_signals & SerialSignal_RTS))
3435                 val |= BIT6;
3436         write_reg(info, CHA + MODE, val);
3437 
3438         /* CCR0
3439          *
3440          * 07      PU Power Up, 1=active, 0=power down
3441          * 06      MCE Master Clock Enable, 1=enabled
3442          * 05      Reserved, 0
3443          * 04..02  SC[2..0] Encoding, 000=NRZ
3444          * 01..00  SM[1..0] Serial Mode, 11=Async
3445          *
3446          * 1000 0011
3447          */
3448         write_reg(info, CHA + CCR0, 0x83);
3449 
3450         /* CCR1
3451          *
3452          * 07..05  Reserved, 0
3453          * 04      ODS Output Driver Select, 1=TxD is push-pull output
3454          * 03      BCR Bit Clock Rate, 1=16x
3455          * 02..00  CM[2..0] Clock Mode, 111=BRG
3456          *
3457          * 0001 1111
3458          */
3459         write_reg(info, CHA + CCR1, 0x1f);
3460 
3461         /* CCR2 (channel A)
3462          *
3463          * 07..06  BGR[9..8] Baud rate bits 9..8
3464          * 05      BDF Baud rate divisor factor, 0=1, 1=BGR value
3465          * 04      SSEL Clock source select, 1=submode b
3466          * 03      TOE 0=TxCLK is input, 0=TxCLK is input
3467          * 02      RWX Read/Write Exchange 0=disabled
3468          * 01      Reserved, 0
3469          * 00      DIV, data inversion 0=disabled, 1=enabled
3470          *
3471          * 0001 0000
3472          */
3473         write_reg(info, CHA + CCR2, 0x10);
3474 
3475         /* CCR3
3476          *
3477          * 07..01  Reserved, 0
3478          * 00      PSD DPLL Phase Shift Disable
3479          *
3480          * 0000 0000
3481          */
3482         write_reg(info, CHA + CCR3, 0);
3483 
3484         /* CCR4
3485          *
3486          * 07      MCK4 Master Clock Divide by 4, 1=enabled
3487          * 06      EBRG Enhanced Baud Rate Generator Mode, 1=enabled
3488          * 05      TST1 Test Pin, 0=normal operation
3489          * 04      ICD Ivert Carrier Detect, 1=enabled (active low)
3490          * 03..00  Reserved, must be 0
3491          *
3492          * 0101 0000
3493          */
3494         write_reg(info, CHA + CCR4, 0x50);
3495         mgslpc_set_rate(info, CHA, info->params.data_rate * 16);
3496 
3497         /* DAFO Data Format
3498          *
3499          * 07      Reserved, 0
3500          * 06      XBRK transmit break, 0=normal operation
3501          * 05      Stop bits (0=1, 1=2)
3502          * 04..03  PAR[1..0] Parity (01=odd, 10=even)
3503          * 02      PAREN Parity Enable
3504          * 01..00  CHL[1..0] Character Length (00=8, 01=7)
3505          *
3506          */
3507         val = 0x00;
3508         if (info->params.data_bits != 8)
3509                 val |= BIT0;    /* 7 bits */
3510         if (info->params.stop_bits != 1)
3511                 val |= BIT5;
3512         if (info->params.parity != ASYNC_PARITY_NONE)
3513         {
3514                 val |= BIT2;    /* Parity enable */
3515                 if (info->params.parity == ASYNC_PARITY_ODD)
3516                         val |= BIT3;
3517                 else
3518                         val |= BIT4;
3519         }
3520         write_reg(info, CHA + DAFO, val);
3521 
3522         /* RFC Rx FIFO Control
3523          *
3524          * 07      Reserved, 0
3525          * 06      DPS, 1=parity bit not stored in data byte
3526          * 05      DXS, 0=all data stored in FIFO (including XON/XOFF)
3527          * 04      RFDF Rx FIFO Data Format, 1=status byte stored in FIFO
3528          * 03..02  RFTH[1..0], rx threshold, 11=16 status + 16 data byte
3529          * 01      Reserved, 0
3530          * 00      TCDE Terminate Char Detect Enable, 0=disabled
3531          *
3532          * 0101 1100
3533          */
3534         write_reg(info, CHA + RFC, 0x5c);
3535 
3536         /* RLCR Receive length check register
3537          *
3538          * Max frame length = (RL + 1) * 32
3539          */
3540         write_reg(info, CHA + RLCR, 0);
3541 
3542         /* XBCH Transmit Byte Count High
3543          *
3544          * 07      DMA mode, 0 = interrupt driven
3545          * 06      NRM, 0=ABM (ignored)
3546          * 05      CAS Carrier Auto Start
3547          * 04      XC Transmit Continuously (ignored)
3548          * 03..00  XBC[10..8] Transmit byte count bits 10..8
3549          *
3550          * 0000 0000
3551          */
3552         val = 0x00;
3553         if (info->params.flags & HDLC_FLAG_AUTO_DCD)
3554                 val |= BIT5;
3555         write_reg(info, CHA + XBCH, val);
3556         if (info->params.flags & HDLC_FLAG_AUTO_CTS)
3557                 irq_enable(info, CHA, IRQ_CTS);
3558 
3559         /* MODE:03 RAC Receiver Active, 1=active */
3560         set_reg_bits(info, CHA + MODE, BIT3);
3561         enable_auxclk(info);
3562         if (info->params.flags & HDLC_FLAG_AUTO_CTS) {
3563                 irq_enable(info, CHB, IRQ_CTS);
3564                 /* PVR[3] 1=AUTO CTS active */
3565                 set_reg_bits(info, CHA + PVR, BIT3);
3566         } else
3567                 clear_reg_bits(info, CHA + PVR, BIT3);
3568         irq_enable(info, CHA,
3569                           IRQ_RXEOM | IRQ_RXFIFO | IRQ_BREAK_ON | IRQ_RXTIME |
3570                           IRQ_ALLSENT | IRQ_TXFIFO);
3571         issue_command(info, CHA, CMD_TXRESET + CMD_RXRESET);
3572         wait_command_complete(info, CHA);
3573         read_reg16(info, CHA + ISR);    /* clear pending IRQs */
3574 }
3575 
3576 /* Set the HDLC idle mode for the transmitter.
3577  */
3578 static void tx_set_idle(MGSLPC_INFO *info)
3579 {
3580         /* Note: ESCC2 only supports flags and one idle modes */
3581         if (info->idle_mode == HDLC_TXIDLE_FLAGS)
3582                 set_reg_bits(info, CHA + CCR1, BIT3);
3583         else
3584                 clear_reg_bits(info, CHA + CCR1, BIT3);
3585 }
3586 
3587 /* get state of the V24 status (input) signals.
3588  */
3589 static void get_signals(MGSLPC_INFO *info)
3590 {
3591         unsigned char status = 0;
3592 
3593         /* preserve RTS and DTR */
3594         info->serial_signals &= SerialSignal_RTS | SerialSignal_DTR;
3595 
3596         if (read_reg(info, CHB + VSTR) & BIT7)
3597                 info->serial_signals |= SerialSignal_DCD;
3598         if (read_reg(info, CHB + STAR) & BIT1)
3599                 info->serial_signals |= SerialSignal_CTS;
3600 
3601         status = read_reg(info, CHA + PVR);
3602         if (!(status & PVR_RI))
3603                 info->serial_signals |= SerialSignal_RI;
3604         if (!(status & PVR_DSR))
3605                 info->serial_signals |= SerialSignal_DSR;
3606 }
3607 
3608 /* Set the state of RTS and DTR based on contents of
3609  * serial_signals member of device extension.
3610  */
3611 static void set_signals(MGSLPC_INFO *info)
3612 {
3613         unsigned char val;
3614 
3615         val = read_reg(info, CHA + MODE);
3616         if (info->params.mode == MGSL_MODE_ASYNC) {
3617                 if (info->serial_signals & SerialSignal_RTS)
3618                         val &= ~BIT6;
3619                 else
3620                         val |= BIT6;
3621         } else {
3622                 if (info->serial_signals & SerialSignal_RTS)
3623                         val |= BIT2;
3624                 else
3625                         val &= ~BIT2;
3626         }
3627         write_reg(info, CHA + MODE, val);
3628 
3629         if (info->serial_signals & SerialSignal_DTR)
3630                 clear_reg_bits(info, CHA + PVR, PVR_DTR);
3631         else
3632                 set_reg_bits(info, CHA + PVR, PVR_DTR);
3633 }
3634 
3635 static void rx_reset_buffers(MGSLPC_INFO *info)
3636 {
3637         RXBUF *buf;
3638         int i;
3639 
3640         info->rx_put = 0;
3641         info->rx_get = 0;
3642         info->rx_frame_count = 0;
3643         for (i=0 ; i < info->rx_buf_count ; i++) {
3644                 buf = (RXBUF*)(info->rx_buf + (i * info->rx_buf_size));
3645                 buf->status = buf->count = 0;
3646         }
3647 }
3648 
3649 /* Attempt to return a received HDLC frame
3650  * Only frames received without errors are returned.
3651  *
3652  * Returns true if frame returned, otherwise false
3653  */
3654 static bool rx_get_frame(MGSLPC_INFO *info, struct tty_struct *tty)
3655 {
3656         unsigned short status;
3657         RXBUF *buf;
3658         unsigned int framesize = 0;
3659         unsigned long flags;
3660         bool return_frame = false;
3661 
3662         if (info->rx_frame_count == 0)
3663                 return false;
3664 
3665         buf = (RXBUF*)(info->rx_buf + (info->rx_get * info->rx_buf_size));
3666 
3667         status = buf->status;
3668 
3669         /* 07  VFR  1=valid frame
3670          * 06  RDO  1=data overrun
3671          * 05  CRC  1=OK, 0=error
3672          * 04  RAB  1=frame aborted
3673          */
3674         if ((status & 0xf0) != 0xA0) {
3675                 if (!(status & BIT7) || (status & BIT4))
3676                         info->icount.rxabort++;
3677                 else if (status & BIT6)
3678                         info->icount.rxover++;
3679                 else if (!(status & BIT5)) {
3680                         info->icount.rxcrc++;
3681                         if (info->params.crc_type & HDLC_CRC_RETURN_EX)
3682                                 return_frame = true;
3683                 }
3684                 framesize = 0;
3685 #if SYNCLINK_GENERIC_HDLC
3686                 {
3687                         info->netdev->stats.rx_errors++;
3688                         info->netdev->stats.rx_frame_errors++;
3689                 }
3690 #endif
3691         } else
3692                 return_frame = true;
3693 
3694         if (return_frame)
3695                 framesize = buf->count;
3696 
3697         if (debug_level >= DEBUG_LEVEL_BH)
3698                 printk("%s(%d):rx_get_frame(%s) status=%04X size=%d\n",
3699                         __FILE__, __LINE__, info->device_name, status, framesize);
3700 
3701         if (debug_level >= DEBUG_LEVEL_DATA)
3702                 trace_block(info, buf->data, framesize, 0);
3703 
3704         if (framesize) {
3705                 if ((info->params.crc_type & HDLC_CRC_RETURN_EX &&
3706                       framesize+1 > info->max_frame_size) ||
3707                     framesize > info->max_frame_size)
3708                         info->icount.rxlong++;
3709                 else {
3710                         if (status & BIT5)
3711                                 info->icount.rxok++;
3712 
3713                         if (info->params.crc_type & HDLC_CRC_RETURN_EX) {
3714                                 *(buf->data + framesize) = status & BIT5 ? RX_OK:RX_CRC_ERROR;
3715                                 ++framesize;
3716                         }
3717 
3718 #if SYNCLINK_GENERIC_HDLC
3719                         if (info->netcount)
3720                                 hdlcdev_rx(info, buf->data, framesize);
3721                         else
3722 #endif
3723                                 ldisc_receive_buf(tty, buf->data, info->flag_buf, framesize);
3724                 }
3725         }
3726 
3727         spin_lock_irqsave(&info->lock, flags);
3728         buf->status = buf->count = 0;
3729         info->rx_frame_count--;
3730         info->rx_get++;
3731         if (info->rx_get >= info->rx_buf_count)
3732                 info->rx_get = 0;
3733         spin_unlock_irqrestore(&info->lock, flags);
3734 
3735         return true;
3736 }
3737 
3738 static bool register_test(MGSLPC_INFO *info)
3739 {
3740         static unsigned char patterns[] =
3741             { 0x00, 0xff, 0xaa, 0x55, 0x69, 0x96, 0x0f };
3742         static unsigned int count = ARRAY_SIZE(patterns);
3743         unsigned int i;
3744         bool rc = true;
3745         unsigned long flags;
3746 
3747         spin_lock_irqsave(&info->lock, flags);
3748         reset_device(info);
3749 
3750         for (i = 0; i < count; i++) {
3751                 write_reg(info, XAD1, patterns[i]);
3752                 write_reg(info, XAD2, patterns[(i + 1) % count]);
3753                 if ((read_reg(info, XAD1) != patterns[i]) ||
3754                     (read_reg(info, XAD2) != patterns[(i + 1) % count])) {
3755                         rc = false;
3756                         break;
3757                 }
3758         }
3759 
3760         spin_unlock_irqrestore(&info->lock, flags);
3761         return rc;
3762 }
3763 
3764 static bool irq_test(MGSLPC_INFO *info)
3765 {
3766         unsigned long end_time;
3767         unsigned long flags;
3768 
3769         spin_lock_irqsave(&info->lock, flags);
3770         reset_device(info);
3771 
3772         info->testing_irq = true;
3773         hdlc_mode(info);
3774 
3775         info->irq_occurred = false;
3776 
3777         /* init hdlc mode */
3778 
3779         irq_enable(info, CHA, IRQ_TIMER);
3780         write_reg(info, CHA + TIMR, 0); /* 512 cycles */
3781         issue_command(info, CHA, CMD_START_TIMER);
3782 
3783         spin_unlock_irqrestore(&info->lock, flags);
3784 
3785         end_time=100;
3786         while(end_time-- && !info->irq_occurred) {
3787                 msleep_interruptible(10);
3788         }
3789 
3790         info->testing_irq = false;
3791 
3792         spin_lock_irqsave(&info->lock, flags);
3793         reset_device(info);
3794         spin_unlock_irqrestore(&info->lock, flags);
3795 
3796         return info->irq_occurred;
3797 }
3798 
3799 static int adapter_test(MGSLPC_INFO *info)
3800 {
3801         if (!register_test(info)) {
3802                 info->init_error = DiagStatus_AddressFailure;
3803                 printk("%s(%d):Register test failure for device %s Addr=%04X\n",
3804                         __FILE__, __LINE__, info->device_name, (unsigned short)(info->io_base));
3805                 return -ENODEV;
3806         }
3807 
3808         if (!irq_test(info)) {
3809                 info->init_error = DiagStatus_IrqFailure;
3810                 printk("%s(%d):Interrupt test failure for device %s IRQ=%d\n",
3811                         __FILE__, __LINE__, info->device_name, (unsigned short)(info->irq_level));
3812                 return -ENODEV;
3813         }
3814 
3815         if (debug_level >= DEBUG_LEVEL_INFO)
3816                 printk("%s(%d):device %s passed diagnostics\n",
3817                         __FILE__, __LINE__, info->device_name);
3818         return 0;
3819 }
3820 
3821 static void trace_block(MGSLPC_INFO *info,const char* data, int count, int xmit)
3822 {
3823         int i;
3824         int linecount;
3825         if (xmit)
3826                 printk("%s tx data:\n", info->device_name);
3827         else
3828                 printk("%s rx data:\n", info->device_name);
3829 
3830         while(count) {
3831                 if (count > 16)
3832                         linecount = 16;
3833                 else
3834                         linecount = count;
3835 
3836                 for(i=0;i<linecount;i++)
3837                         printk("%02X ", (unsigned char)data[i]);
3838                 for(;i<17;i++)
3839                         printk("   ");
3840                 for(i=0;i<linecount;i++) {
3841                         if (data[i]>=040 && data[i]<=0176)
3842                                 printk("%c", data[i]);
3843                         else
3844                                 printk(".");
3845                 }
3846                 printk("\n");
3847 
3848                 data  += linecount;
3849                 count -= linecount;
3850         }
3851 }
3852 
3853 /* HDLC frame time out
3854  * update stats and do tx completion processing
3855  */
3856 static void tx_timeout(unsigned long context)
3857 {
3858         MGSLPC_INFO *info = (MGSLPC_INFO*)context;
3859         unsigned long flags;
3860 
3861         if (debug_level >= DEBUG_LEVEL_INFO)
3862                 printk("%s(%d):tx_timeout(%s)\n",
3863                         __FILE__, __LINE__, info->device_name);
3864         if (info->tx_active &&
3865             info->params.mode == MGSL_MODE_HDLC) {
3866                 info->icount.txtimeout++;
3867         }
3868         spin_lock_irqsave(&info->lock, flags);
3869         info->tx_active = false;
3870         info->tx_count = info->tx_put = info->tx_get = 0;
3871 
3872         spin_unlock_irqrestore(&info->lock, flags);
3873 
3874 #if SYNCLINK_GENERIC_HDLC
3875         if (info->netcount)
3876                 hdlcdev_tx_done(info);
3877         else
3878 #endif
3879         {
3880                 struct tty_struct *tty = tty_port_tty_get(&info->port);
3881                 bh_transmit(info, tty);
3882                 tty_kref_put(tty);
3883         }
3884 }
3885 
3886 #if SYNCLINK_GENERIC_HDLC
3887 
3888 /**
3889  * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
3890  * set encoding and frame check sequence (FCS) options
3891  *
3892  * dev       pointer to network device structure
3893  * encoding  serial encoding setting
3894  * parity    FCS setting
3895  *
3896  * returns 0 if success, otherwise error code
3897  */
3898 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
3899                           unsigned short parity)
3900 {
3901         MGSLPC_INFO *info = dev_to_port(dev);
3902         struct tty_struct *tty;
3903         unsigned char  new_encoding;
3904         unsigned short new_crctype;
3905 
3906         /* return error if TTY interface open */
3907         if (info->port.count)
3908                 return -EBUSY;
3909 
3910         switch (encoding)
3911         {
3912         case ENCODING_NRZ:        new_encoding = HDLC_ENCODING_NRZ; break;
3913         case ENCODING_NRZI:       new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
3914         case ENCODING_FM_MARK:    new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
3915         case ENCODING_FM_SPACE:   new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
3916         case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
3917         default: return -EINVAL;
3918         }
3919 
3920         switch (parity)
3921         {
3922         case PARITY_NONE:            new_crctype = HDLC_CRC_NONE; break;
3923         case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
3924         case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
3925         default: return -EINVAL;
3926         }
3927 
3928         info->params.encoding = new_encoding;
3929         info->params.crc_type = new_crctype;
3930 
3931         /* if network interface up, reprogram hardware */
3932         if (info->netcount) {
3933                 tty = tty_port_tty_get(&info->port);
3934                 mgslpc_program_hw(info, tty);
3935                 tty_kref_put(tty);
3936         }
3937 
3938         return 0;
3939 }
3940 
3941 /**
3942  * called by generic HDLC layer to send frame
3943  *
3944  * skb  socket buffer containing HDLC frame
3945  * dev  pointer to network device structure
3946  */
3947 static netdev_tx_t hdlcdev_xmit(struct sk_buff *skb,
3948                                       struct net_device *dev)
3949 {
3950         MGSLPC_INFO *info = dev_to_port(dev);
3951         unsigned long flags;
3952 
3953         if (debug_level >= DEBUG_LEVEL_INFO)
3954                 printk(KERN_INFO "%s:hdlc_xmit(%s)\n", __FILE__, dev->name);
3955 
3956         /* stop sending until this frame completes */
3957         netif_stop_queue(dev);
3958 
3959         /* copy data to device buffers */
3960         skb_copy_from_linear_data(skb, info->tx_buf, skb->len);
3961         info->tx_get = 0;
3962         info->tx_put = info->tx_count = skb->len;
3963 
3964         /* update network statistics */
3965         dev->stats.tx_packets++;
3966         dev->stats.tx_bytes += skb->len;
3967 
3968         /* done with socket buffer, so free it */
3969         dev_kfree_skb(skb);
3970 
3971         /* save start time for transmit timeout detection */
3972         dev->trans_start = jiffies;
3973 
3974         /* start hardware transmitter if necessary */
3975         spin_lock_irqsave(&info->lock, flags);
3976         if (!info->tx_active) {
3977                 struct tty_struct *tty = tty_port_tty_get(&info->port);
3978                 tx_start(info, tty);
3979                 tty_kref_put(tty);
3980         }
3981         spin_unlock_irqrestore(&info->lock, flags);
3982 
3983         return NETDEV_TX_OK;
3984 }
3985 
3986 /**
3987  * called by network layer when interface enabled
3988  * claim resources and initialize hardware
3989  *
3990  * dev  pointer to network device structure
3991  *
3992  * returns 0 if success, otherwise error code
3993  */
3994 static int hdlcdev_open(struct net_device *dev)
3995 {
3996         MGSLPC_INFO *info = dev_to_port(dev);
3997         struct tty_struct *tty;
3998         int rc;
3999         unsigned long flags;
4000 
4001         if (debug_level >= DEBUG_LEVEL_INFO)
4002                 printk("%s:hdlcdev_open(%s)\n", __FILE__, dev->name);
4003 
4004         /* generic HDLC layer open processing */
4005         rc = hdlc_open(dev);
4006         if (rc != 0)
4007                 return rc;
4008 
4009         /* arbitrate between network and tty opens */
4010         spin_lock_irqsave(&info->netlock, flags);
4011         if (info->port.count != 0 || info->netcount != 0) {
4012                 printk(KERN_WARNING "%s: hdlc_open returning busy\n", dev->name);
4013                 spin_unlock_irqrestore(&info->netlock, flags);
4014                 return -EBUSY;
4015         }
4016         info->netcount=1;
4017         spin_unlock_irqrestore(&info->netlock, flags);
4018 
4019         tty = tty_port_tty_get(&info->port);
4020         /* claim resources and init adapter */
4021         rc = startup(info, tty);
4022         if (rc != 0) {
4023                 tty_kref_put(tty);
4024                 spin_lock_irqsave(&info->netlock, flags);
4025                 info->netcount=0;
4026                 spin_unlock_irqrestore(&info->netlock, flags);
4027                 return rc;
4028         }
4029         /* assert RTS and DTR, apply hardware settings */
4030         info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR;
4031         mgslpc_program_hw(info, tty);
4032         tty_kref_put(tty);
4033 
4034         /* enable network layer transmit */
4035         dev->trans_start = jiffies;
4036         netif_start_queue(dev);
4037 
4038         /* inform generic HDLC layer of current DCD status */
4039         spin_lock_irqsave(&info->lock, flags);
4040         get_signals(info);
4041         spin_unlock_irqrestore(&info->lock, flags);
4042         if (info->serial_signals & SerialSignal_DCD)
4043                 netif_carrier_on(dev);
4044         else
4045                 netif_carrier_off(dev);
4046         return 0;
4047 }
4048 
4049 /**
4050  * called by network layer when interface is disabled
4051  * shutdown hardware and release resources
4052  *
4053  * dev  pointer to network device structure
4054  *
4055  * returns 0 if success, otherwise error code
4056  */
4057 static int hdlcdev_close(struct net_device *dev)
4058 {
4059         MGSLPC_INFO *info = dev_to_port(dev);
4060         struct tty_struct *tty = tty_port_tty_get(&info->port);
4061         unsigned long flags;
4062 
4063         if (debug_level >= DEBUG_LEVEL_INFO)
4064                 printk("%s:hdlcdev_close(%s)\n", __FILE__, dev->name);
4065 
4066         netif_stop_queue(dev);
4067 
4068         /* shutdown adapter and release resources */
4069         shutdown(info, tty);
4070         tty_kref_put(tty);
4071         hdlc_close(dev);
4072 
4073         spin_lock_irqsave(&info->netlock, flags);
4074         info->netcount=0;
4075         spin_unlock_irqrestore(&info->netlock, flags);
4076 
4077         return 0;
4078 }
4079 
4080 /**
4081  * called by network layer to process IOCTL call to network device
4082  *
4083  * dev  pointer to network device structure
4084  * ifr  pointer to network interface request structure
4085  * cmd  IOCTL command code
4086  *
4087  * returns 0 if success, otherwise error code
4088  */
4089 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
4090 {
4091         const size_t size = sizeof(sync_serial_settings);
4092         sync_serial_settings new_line;
4093         sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
4094         MGSLPC_INFO *info = dev_to_port(dev);
4095         unsigned int flags;
4096 
4097         if (debug_level >= DEBUG_LEVEL_INFO)
4098                 printk("%s:hdlcdev_ioctl(%s)\n", __FILE__, dev->name);
4099 
4100         /* return error if TTY interface open */
4101         if (info->port.count)
4102                 return -EBUSY;
4103 
4104         if (cmd != SIOCWANDEV)
4105                 return hdlc_ioctl(dev, ifr, cmd);
4106 
4107         memset(&new_line, 0, size);
4108 
4109         switch(ifr->ifr_settings.type) {
4110         case IF_GET_IFACE: /* return current sync_serial_settings */
4111 
4112                 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
4113                 if (ifr->ifr_settings.size < size) {
4114                         ifr->ifr_settings.size = size; /* data size wanted */
4115                         return -ENOBUFS;
4116                 }
4117 
4118                 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
4119                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
4120                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
4121                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
4122 
4123                 switch (flags){
4124                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
4125                 case (HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_INT; break;
4126                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_TXINT; break;
4127                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
4128                 default: new_line.clock_type = CLOCK_DEFAULT;
4129                 }
4130 
4131                 new_line.clock_rate = info->params.clock_speed;
4132                 new_line.loopback   = info->params.loopback ? 1:0;
4133 
4134                 if (copy_to_user(line, &new_line, size))
4135                         return -EFAULT;
4136                 return 0;
4137 
4138         case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
4139 
4140                 if(!capable(CAP_NET_ADMIN))
4141                         return -EPERM;
4142                 if (copy_from_user(&new_line, line, size))
4143                         return -EFAULT;
4144 
4145                 switch (new_line.clock_type)
4146                 {
4147                 case CLOCK_EXT:      flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
4148                 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
4149                 case CLOCK_INT:      flags = HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG;    break;
4150                 case CLOCK_TXINT:    flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG;    break;
4151                 case CLOCK_DEFAULT:  flags = info->params.flags &
4152                                              (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
4153                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
4154                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
4155                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN); break;
4156                 default: return -EINVAL;
4157                 }
4158 
4159                 if (new_line.loopback != 0 && new_line.loopback != 1)
4160                         return -EINVAL;
4161 
4162                 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
4163                                         HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
4164                                         HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
4165                                         HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
4166                 info->params.flags |= flags;
4167 
4168                 info->params.loopback = new_line.loopback;
4169 
4170                 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
4171                         info->params.clock_speed = new_line.clock_rate;
4172                 else
4173                         info->params.clock_speed = 0;
4174 
4175                 /* if network interface up, reprogram hardware */
4176                 if (info->netcount) {
4177                         struct tty_struct *tty = tty_port_tty_get(&info->port);
4178                         mgslpc_program_hw(info, tty);
4179                         tty_kref_put(tty);
4180                 }
4181                 return 0;
4182 
4183         default:
4184                 return hdlc_ioctl(dev, ifr, cmd);
4185         }
4186 }
4187 
4188 /**
4189  * called by network layer when transmit timeout is detected
4190  *
4191  * dev  pointer to network device structure
4192  */
4193 static void hdlcdev_tx_timeout(struct net_device *dev)
4194 {
4195         MGSLPC_INFO *info = dev_to_port(dev);
4196         unsigned long flags;
4197 
4198         if (debug_level >= DEBUG_LEVEL_INFO)
4199                 printk("hdlcdev_tx_timeout(%s)\n", dev->name);
4200 
4201         dev->stats.tx_errors++;
4202         dev->stats.tx_aborted_errors++;
4203 
4204         spin_lock_irqsave(&info->lock, flags);
4205         tx_stop(info);
4206         spin_unlock_irqrestore(&info->lock, flags);
4207 
4208         netif_wake_queue(dev);
4209 }
4210 
4211 /**
4212  * called by device driver when transmit completes
4213  * reenable network layer transmit if stopped
4214  *
4215  * info  pointer to device instance information
4216  */
4217 static void hdlcdev_tx_done(MGSLPC_INFO *info)
4218 {
4219         if (netif_queue_stopped(info->netdev))
4220                 netif_wake_queue(info->netdev);
4221 }
4222 
4223 /**
4224  * called by device driver when frame received
4225  * pass frame to network layer
4226  *
4227  * info  pointer to device instance information
4228  * buf   pointer to buffer contianing frame data
4229  * size  count of data bytes in buf
4230  */
4231 static void hdlcdev_rx(MGSLPC_INFO *info, char *buf, int size)
4232 {
4233         struct sk_buff *skb = dev_alloc_skb(size);
4234         struct net_device *dev = info->netdev;
4235 
4236         if (debug_level >= DEBUG_LEVEL_INFO)
4237                 printk("hdlcdev_rx(%s)\n", dev->name);
4238 
4239         if (skb == NULL) {
4240                 printk(KERN_NOTICE "%s: can't alloc skb, dropping packet\n", dev->name);
4241                 dev->stats.rx_dropped++;
4242                 return;
4243         }
4244 
4245         memcpy(skb_put(skb, size), buf, size);
4246 
4247         skb->protocol = hdlc_type_trans(skb, dev);
4248 
4249         dev->stats.rx_packets++;
4250         dev->stats.rx_bytes += size;
4251 
4252         netif_rx(skb);
4253 }
4254 
4255 static const struct net_device_ops hdlcdev_ops = {
4256         .ndo_open       = hdlcdev_open,
4257         .ndo_stop       = hdlcdev_close,
4258         .ndo_change_mtu = hdlc_change_mtu,
4259         .ndo_start_xmit = hdlc_start_xmit,
4260         .ndo_do_ioctl   = hdlcdev_ioctl,
4261         .ndo_tx_timeout = hdlcdev_tx_timeout,
4262 };
4263 
4264 /**
4265  * called by device driver when adding device instance
4266  * do generic HDLC initialization
4267  *
4268  * info  pointer to device instance information
4269  *
4270  * returns 0 if success, otherwise error code
4271  */
4272 static int hdlcdev_init(MGSLPC_INFO *info)
4273 {
4274         int rc;
4275         struct net_device *dev;
4276         hdlc_device *hdlc;
4277 
4278         /* allocate and initialize network and HDLC layer objects */
4279 
4280         dev = alloc_hdlcdev(info);
4281         if (dev == NULL) {
4282                 printk(KERN_ERR "%s:hdlc device allocation failure\n", __FILE__);
4283                 return -ENOMEM;
4284         }
4285 
4286         /* for network layer reporting purposes only */
4287         dev->base_addr = info->io_base;
4288         dev->irq       = info->irq_level;
4289 
4290         /* network layer callbacks and settings */
4291         dev->netdev_ops     = &hdlcdev_ops;
4292         dev->watchdog_timeo = 10 * HZ;
4293         dev->tx_queue_len   = 50;
4294 
4295         /* generic HDLC layer callbacks and settings */
4296         hdlc         = dev_to_hdlc(dev);
4297         hdlc->attach = hdlcdev_attach;
4298         hdlc->xmit   = hdlcdev_xmit;
4299 
4300         /* register objects with HDLC layer */
4301         rc = register_hdlc_device(dev);
4302         if (rc) {
4303                 printk(KERN_WARNING "%s:unable to register hdlc device\n", __FILE__);
4304                 free_netdev(dev);
4305                 return rc;
4306         }
4307 
4308         info->netdev = dev;
4309         return 0;
4310 }
4311 
4312 /**
4313  * called by device driver when removing device instance
4314  * do generic HDLC cleanup
4315  *
4316  * info  pointer to device instance information
4317  */
4318 static void hdlcdev_exit(MGSLPC_INFO *info)
4319 {
4320         unregister_hdlc_device(info->netdev);
4321         free_netdev(info->netdev);
4322         info->netdev = NULL;
4323 }
4324 
4325 #endif /* CONFIG_HDLC */
4326 
4327 

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