1a0bc30b79d10f8e858b998378c4b6ad68a4f99e
[linux-3.10.git] / 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/pci.h>
46 #include <linux/tty.h>
47 #include <linux/tty_flip.h>
48 #include <linux/serial.h>
49 #include <linux/major.h>
50 #include <linux/string.h>
51 #include <linux/fcntl.h>
52 #include <linux/ptrace.h>
53 #include <linux/ioport.h>
54 #include <linux/mm.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
62 #include <asm/system.h>
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/cs_types.h>
73 #include <pcmcia/cs.h>
74 #include <pcmcia/cistpl.h>
75 #include <pcmcia/cisreg.h>
76 #include <pcmcia/ds.h>
77
78 #ifdef CONFIG_HDLC_MODULE
79 #define CONFIG_HDLC 1
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 #include "linux/synclink.h"
90
91 static MGSL_PARAMS default_params = {
92         MGSL_MODE_HDLC,                 /* unsigned long mode */
93         0,                              /* unsigned char loopback; */
94         HDLC_FLAG_UNDERRUN_ABORT15,     /* unsigned short flags; */
95         HDLC_ENCODING_NRZI_SPACE,       /* unsigned char encoding; */
96         0,                              /* unsigned long clock_speed; */
97         0xff,                           /* unsigned char addr_filter; */
98         HDLC_CRC_16_CCITT,              /* unsigned short crc_type; */
99         HDLC_PREAMBLE_LENGTH_8BITS,     /* unsigned char preamble_length; */
100         HDLC_PREAMBLE_PATTERN_NONE,     /* unsigned char preamble; */
101         9600,                           /* unsigned long data_rate; */
102         8,                              /* unsigned char data_bits; */
103         1,                              /* unsigned char stop_bits; */
104         ASYNC_PARITY_NONE               /* unsigned char parity; */
105 };
106
107 typedef struct
108 {
109         int count;
110         unsigned char status;
111         char data[1];
112 } RXBUF;
113
114 /* The queue of BH actions to be performed */
115
116 #define BH_RECEIVE  1
117 #define BH_TRANSMIT 2
118 #define BH_STATUS   4
119
120 #define IO_PIN_SHUTDOWN_LIMIT 100
121
122 #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
123
124 struct _input_signal_events {
125         int     ri_up;  
126         int     ri_down;
127         int     dsr_up;
128         int     dsr_down;
129         int     dcd_up;
130         int     dcd_down;
131         int     cts_up;
132         int     cts_down;
133 };
134
135
136 /*
137  * Device instance data structure
138  */
139  
140 typedef struct _mgslpc_info {
141         void *if_ptr;   /* General purpose pointer (used by SPPP) */
142         int                     magic;
143         int                     flags;
144         int                     count;          /* count of opens */
145         int                     line;
146         unsigned short          close_delay;
147         unsigned short          closing_wait;   /* time to wait before closing */
148         
149         struct mgsl_icount      icount;
150         
151         struct tty_struct       *tty;
152         int                     timeout;
153         int                     x_char;         /* xon/xoff character */
154         int                     blocked_open;   /* # of blocked opens */
155         unsigned char           read_status_mask;
156         unsigned char           ignore_status_mask;     
157
158         unsigned char *tx_buf;
159         int            tx_put;
160         int            tx_get;
161         int            tx_count;
162
163         /* circular list of fixed length rx buffers */
164
165         unsigned char  *rx_buf;        /* memory allocated for all rx buffers */
166         int            rx_buf_total_size; /* size of memory allocated for rx buffers */
167         int            rx_put;         /* index of next empty rx buffer */
168         int            rx_get;         /* index of next full rx buffer */
169         int            rx_buf_size;    /* size in bytes of single rx buffer */
170         int            rx_buf_count;   /* total number of rx buffers */
171         int            rx_frame_count; /* number of full rx buffers */
172         
173         wait_queue_head_t       open_wait;
174         wait_queue_head_t       close_wait;
175         
176         wait_queue_head_t       status_event_wait_q;
177         wait_queue_head_t       event_wait_q;
178         struct timer_list       tx_timer;       /* HDLC transmit timeout timer */
179         struct _mgslpc_info     *next_device;   /* device list link */
180
181         unsigned short imra_value;
182         unsigned short imrb_value;
183         unsigned char  pim_value;
184
185         spinlock_t lock;
186         struct work_struct task;                /* task structure for scheduling bh */
187
188         u32 max_frame_size;
189
190         u32 pending_bh;
191
192         int bh_running;
193         int bh_requested;
194         
195         int dcd_chkcount; /* check counts to prevent */
196         int cts_chkcount; /* too many IRQs if a signal */
197         int dsr_chkcount; /* is floating */
198         int ri_chkcount;
199
200         int rx_enabled;
201         int rx_overflow;
202
203         int tx_enabled;
204         int tx_active;
205         int tx_aborting;
206         u32 idle_mode;
207
208         int if_mode; /* serial interface selection (RS-232, v.35 etc) */
209
210         char device_name[25];           /* device instance name */
211
212         unsigned int io_base;   /* base I/O address of adapter */
213         unsigned int irq_level;
214         
215         MGSL_PARAMS params;             /* communications parameters */
216
217         unsigned char serial_signals;   /* current serial signal states */
218
219         char irq_occurred;              /* for diagnostics use */
220         char testing_irq;
221         unsigned int init_error;        /* startup error (DIAGS)        */
222
223         char flag_buf[MAX_ASYNC_BUFFER_SIZE];
224         BOOLEAN drop_rts_on_tx_done;
225
226         struct  _input_signal_events    input_signal_events;
227
228         /* PCMCIA support */
229         struct pcmcia_device    *p_dev;
230         dev_node_t            node;
231         int                   stop;
232
233         /* SPPP/Cisco HDLC device parts */
234         int netcount;
235         int dosyncppp;
236         spinlock_t netlock;
237
238 #ifdef CONFIG_HDLC
239         struct net_device *netdev;
240 #endif
241
242 } MGSLPC_INFO;
243
244 #define MGSLPC_MAGIC 0x5402
245
246 /*
247  * The size of the serial xmit buffer is 1 page, or 4096 bytes
248  */
249 #define TXBUFSIZE 4096
250
251     
252 #define CHA     0x00   /* channel A offset */
253 #define CHB     0x40   /* channel B offset */
254
255 /*
256  *  FIXME: PPC has PVR defined in asm/reg.h.  For now we just undef it.
257  */
258 #undef PVR
259
260 #define RXFIFO  0
261 #define TXFIFO  0
262 #define STAR    0x20
263 #define CMDR    0x20
264 #define RSTA    0x21
265 #define PRE     0x21
266 #define MODE    0x22
267 #define TIMR    0x23
268 #define XAD1    0x24
269 #define XAD2    0x25
270 #define RAH1    0x26
271 #define RAH2    0x27
272 #define DAFO    0x27
273 #define RAL1    0x28
274 #define RFC     0x28
275 #define RHCR    0x29
276 #define RAL2    0x29
277 #define RBCL    0x2a
278 #define XBCL    0x2a
279 #define RBCH    0x2b
280 #define XBCH    0x2b
281 #define CCR0    0x2c
282 #define CCR1    0x2d
283 #define CCR2    0x2e
284 #define CCR3    0x2f
285 #define VSTR    0x34
286 #define BGR     0x34
287 #define RLCR    0x35
288 #define AML     0x36
289 #define AMH     0x37
290 #define GIS     0x38
291 #define IVA     0x38
292 #define IPC     0x39
293 #define ISR     0x3a
294 #define IMR     0x3a
295 #define PVR     0x3c
296 #define PIS     0x3d
297 #define PIM     0x3d
298 #define PCR     0x3e
299 #define CCR4    0x3f
300     
301 // IMR/ISR
302     
303 #define IRQ_BREAK_ON    BIT15   // rx break detected
304 #define IRQ_DATAOVERRUN BIT14   // receive data overflow
305 #define IRQ_ALLSENT     BIT13   // all sent
306 #define IRQ_UNDERRUN    BIT12   // transmit data underrun
307 #define IRQ_TIMER       BIT11   // timer interrupt
308 #define IRQ_CTS         BIT10   // CTS status change
309 #define IRQ_TXREPEAT    BIT9    // tx message repeat
310 #define IRQ_TXFIFO      BIT8    // transmit pool ready
311 #define IRQ_RXEOM       BIT7    // receive message end
312 #define IRQ_EXITHUNT    BIT6    // receive frame start
313 #define IRQ_RXTIME      BIT6    // rx char timeout
314 #define IRQ_DCD         BIT2    // carrier detect status change
315 #define IRQ_OVERRUN     BIT1    // receive frame overflow
316 #define IRQ_RXFIFO      BIT0    // receive pool full
317     
318 // STAR
319     
320 #define XFW   BIT6              // transmit FIFO write enable
321 #define CEC   BIT2              // command executing
322 #define CTS   BIT1              // CTS state
323     
324 #define PVR_DTR      BIT0
325 #define PVR_DSR      BIT1
326 #define PVR_RI       BIT2
327 #define PVR_AUTOCTS  BIT3
328 #define PVR_RS232    0x20   /* 0010b */
329 #define PVR_V35      0xe0   /* 1110b */
330 #define PVR_RS422    0x40   /* 0100b */
331     
332 /* Register access functions */ 
333     
334 #define write_reg(info, reg, val) outb((val),(info)->io_base + (reg))
335 #define read_reg(info, reg) inb((info)->io_base + (reg))
336
337 #define read_reg16(info, reg) inw((info)->io_base + (reg))  
338 #define write_reg16(info, reg, val) outw((val), (info)->io_base + (reg))
339     
340 #define set_reg_bits(info, reg, mask) \
341     write_reg(info, (reg), \
342                  (unsigned char) (read_reg(info, (reg)) | (mask)))  
343 #define clear_reg_bits(info, reg, mask) \
344     write_reg(info, (reg), \
345                  (unsigned char) (read_reg(info, (reg)) & ~(mask)))  
346 /*
347  * interrupt enable/disable routines
348  */ 
349 static void irq_disable(MGSLPC_INFO *info, unsigned char channel, unsigned short mask) 
350 {
351         if (channel == CHA) {
352                 info->imra_value |= mask;
353                 write_reg16(info, CHA + IMR, info->imra_value);
354         } else {
355                 info->imrb_value |= mask;
356                 write_reg16(info, CHB + IMR, info->imrb_value);
357         }
358 }
359 static void irq_enable(MGSLPC_INFO *info, unsigned char channel, unsigned short mask) 
360 {
361         if (channel == CHA) {
362                 info->imra_value &= ~mask;
363                 write_reg16(info, CHA + IMR, info->imra_value);
364         } else {
365                 info->imrb_value &= ~mask;
366                 write_reg16(info, CHB + IMR, info->imrb_value);
367         }
368 }
369
370 #define port_irq_disable(info, mask) \
371   { info->pim_value |= (mask); write_reg(info, PIM, info->pim_value); }
372
373 #define port_irq_enable(info, mask) \
374   { info->pim_value &= ~(mask); write_reg(info, PIM, info->pim_value); }
375
376 static void rx_start(MGSLPC_INFO *info);
377 static void rx_stop(MGSLPC_INFO *info);
378
379 static void tx_start(MGSLPC_INFO *info);
380 static void tx_stop(MGSLPC_INFO *info);
381 static void tx_set_idle(MGSLPC_INFO *info);
382
383 static void get_signals(MGSLPC_INFO *info);
384 static void set_signals(MGSLPC_INFO *info);
385
386 static void reset_device(MGSLPC_INFO *info);
387
388 static void hdlc_mode(MGSLPC_INFO *info);
389 static void async_mode(MGSLPC_INFO *info);
390
391 static void tx_timeout(unsigned long context);
392
393 static int ioctl_common(MGSLPC_INFO *info, unsigned int cmd, unsigned long arg);
394
395 #ifdef CONFIG_HDLC
396 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
397 static void hdlcdev_tx_done(MGSLPC_INFO *info);
398 static void hdlcdev_rx(MGSLPC_INFO *info, char *buf, int size);
399 static int  hdlcdev_init(MGSLPC_INFO *info);
400 static void hdlcdev_exit(MGSLPC_INFO *info);
401 #endif
402
403 static void trace_block(MGSLPC_INFO *info,const char* data, int count, int xmit);
404
405 static BOOLEAN register_test(MGSLPC_INFO *info);
406 static BOOLEAN irq_test(MGSLPC_INFO *info);
407 static int adapter_test(MGSLPC_INFO *info);
408
409 static int claim_resources(MGSLPC_INFO *info);
410 static void release_resources(MGSLPC_INFO *info);
411 static void mgslpc_add_device(MGSLPC_INFO *info);
412 static void mgslpc_remove_device(MGSLPC_INFO *info);
413
414 static int  rx_get_frame(MGSLPC_INFO *info);
415 static void rx_reset_buffers(MGSLPC_INFO *info);
416 static int  rx_alloc_buffers(MGSLPC_INFO *info);
417 static void rx_free_buffers(MGSLPC_INFO *info);
418
419 static irqreturn_t mgslpc_isr(int irq, void *dev_id);
420
421 /*
422  * Bottom half interrupt handlers
423  */
424 static void bh_handler(void* Context);
425 static void bh_transmit(MGSLPC_INFO *info);
426 static void bh_status(MGSLPC_INFO *info);
427
428 /*
429  * ioctl handlers
430  */
431 static int tiocmget(struct tty_struct *tty, struct file *file);
432 static int tiocmset(struct tty_struct *tty, struct file *file,
433                     unsigned int set, unsigned int clear);
434 static int get_stats(MGSLPC_INFO *info, struct mgsl_icount __user *user_icount);
435 static int get_params(MGSLPC_INFO *info, MGSL_PARAMS __user *user_params);
436 static int set_params(MGSLPC_INFO *info, MGSL_PARAMS __user *new_params);
437 static int get_txidle(MGSLPC_INFO *info, int __user *idle_mode);
438 static int set_txidle(MGSLPC_INFO *info, int idle_mode);
439 static int set_txenable(MGSLPC_INFO *info, int enable);
440 static int tx_abort(MGSLPC_INFO *info);
441 static int set_rxenable(MGSLPC_INFO *info, int enable);
442 static int wait_events(MGSLPC_INFO *info, int __user *mask);
443
444 static MGSLPC_INFO *mgslpc_device_list = NULL;
445 static int mgslpc_device_count = 0;
446
447 /*
448  * Set this param to non-zero to load eax with the
449  * .text section address and breakpoint on module load.
450  * This is useful for use with gdb and add-symbol-file command.
451  */
452 static int break_on_load=0;
453
454 /*
455  * Driver major number, defaults to zero to get auto
456  * assigned major number. May be forced as module parameter.
457  */
458 static int ttymajor=0;
459
460 static int debug_level = 0;
461 static int maxframe[MAX_DEVICE_COUNT] = {0,};
462 static int dosyncppp[MAX_DEVICE_COUNT] = {1,1,1,1};
463
464 module_param(break_on_load, bool, 0);
465 module_param(ttymajor, int, 0);
466 module_param(debug_level, int, 0);
467 module_param_array(maxframe, int, NULL, 0);
468 module_param_array(dosyncppp, int, NULL, 0);
469
470 MODULE_LICENSE("GPL");
471
472 static char *driver_name = "SyncLink PC Card driver";
473 static char *driver_version = "$Revision: 4.34 $";
474
475 static struct tty_driver *serial_driver;
476
477 /* number of characters left in xmit buffer before we ask for more */
478 #define WAKEUP_CHARS 256
479
480 static void mgslpc_change_params(MGSLPC_INFO *info);
481 static void mgslpc_wait_until_sent(struct tty_struct *tty, int timeout);
482
483 /* PCMCIA prototypes */
484
485 static int mgslpc_config(struct pcmcia_device *link);
486 static void mgslpc_release(u_long arg);
487 static void mgslpc_detach(struct pcmcia_device *p_dev);
488
489 /*
490  * 1st function defined in .text section. Calling this function in
491  * init_module() followed by a breakpoint allows a remote debugger
492  * (gdb) to get the .text address for the add-symbol-file command.
493  * This allows remote debugging of dynamically loadable modules.
494  */
495 static void* mgslpc_get_text_ptr(void)
496 {
497         return mgslpc_get_text_ptr;
498 }
499
500 /**
501  * line discipline callback wrappers
502  *
503  * The wrappers maintain line discipline references
504  * while calling into the line discipline.
505  *
506  * ldisc_flush_buffer - flush line discipline receive buffers
507  * ldisc_receive_buf  - pass receive data to line discipline
508  */
509
510 static void ldisc_flush_buffer(struct tty_struct *tty)
511 {
512         struct tty_ldisc *ld = tty_ldisc_ref(tty);
513         if (ld) {
514                 if (ld->flush_buffer)
515                         ld->flush_buffer(tty);
516                 tty_ldisc_deref(ld);
517         }
518 }
519
520 static void ldisc_receive_buf(struct tty_struct *tty,
521                               const __u8 *data, char *flags, int count)
522 {
523         struct tty_ldisc *ld;
524         if (!tty)
525                 return;
526         ld = tty_ldisc_ref(tty);
527         if (ld) {
528                 if (ld->receive_buf)
529                         ld->receive_buf(tty, data, flags, count);
530                 tty_ldisc_deref(ld);
531         }
532 }
533
534 static int mgslpc_probe(struct pcmcia_device *link)
535 {
536     MGSLPC_INFO *info;
537     int ret;
538
539     if (debug_level >= DEBUG_LEVEL_INFO)
540             printk("mgslpc_attach\n");
541
542     info = (MGSLPC_INFO *)kmalloc(sizeof(MGSLPC_INFO), GFP_KERNEL);
543     if (!info) {
544             printk("Error can't allocate device instance data\n");
545             return -ENOMEM;
546     }
547
548     memset(info, 0, sizeof(MGSLPC_INFO));
549     info->magic = MGSLPC_MAGIC;
550     INIT_WORK(&info->task, bh_handler, info);
551     info->max_frame_size = 4096;
552     info->close_delay = 5*HZ/10;
553     info->closing_wait = 30*HZ;
554     init_waitqueue_head(&info->open_wait);
555     init_waitqueue_head(&info->close_wait);
556     init_waitqueue_head(&info->status_event_wait_q);
557     init_waitqueue_head(&info->event_wait_q);
558     spin_lock_init(&info->lock);
559     spin_lock_init(&info->netlock);
560     memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
561     info->idle_mode = HDLC_TXIDLE_FLAGS;                
562     info->imra_value = 0xffff;
563     info->imrb_value = 0xffff;
564     info->pim_value = 0xff;
565
566     info->p_dev = link;
567     link->priv = info;
568
569     /* Initialize the struct pcmcia_device structure */
570
571     /* Interrupt setup */
572     link->irq.Attributes = IRQ_TYPE_EXCLUSIVE;
573     link->irq.IRQInfo1   = IRQ_LEVEL_ID;
574     link->irq.Handler = NULL;
575
576     link->conf.Attributes = 0;
577     link->conf.IntType = INT_MEMORY_AND_IO;
578
579     ret = mgslpc_config(link);
580     if (ret)
581             return ret;
582
583     mgslpc_add_device(info);
584
585     return 0;
586 }
587
588 /* Card has been inserted.
589  */
590
591 #define CS_CHECK(fn, ret) \
592 do { last_fn = (fn); if ((last_ret = (ret)) != 0) goto cs_failed; } while (0)
593
594 static int mgslpc_config(struct pcmcia_device *link)
595 {
596     MGSLPC_INFO *info = link->priv;
597     tuple_t tuple;
598     cisparse_t parse;
599     int last_fn, last_ret;
600     u_char buf[64];
601     cistpl_cftable_entry_t dflt = { 0 };
602     cistpl_cftable_entry_t *cfg;
603     
604     if (debug_level >= DEBUG_LEVEL_INFO)
605             printk("mgslpc_config(0x%p)\n", link);
606
607     /* read CONFIG tuple to find its configuration registers */
608     tuple.DesiredTuple = CISTPL_CONFIG;
609     tuple.Attributes = 0;
610     tuple.TupleData = buf;
611     tuple.TupleDataMax = sizeof(buf);
612     tuple.TupleOffset = 0;
613     CS_CHECK(GetFirstTuple, pcmcia_get_first_tuple(link, &tuple));
614     CS_CHECK(GetTupleData, pcmcia_get_tuple_data(link, &tuple));
615     CS_CHECK(ParseTuple, pcmcia_parse_tuple(link, &tuple, &parse));
616     link->conf.ConfigBase = parse.config.base;
617     link->conf.Present = parse.config.rmask[0];
618
619     /* get CIS configuration entry */
620
621     tuple.DesiredTuple = CISTPL_CFTABLE_ENTRY;
622     CS_CHECK(GetFirstTuple, pcmcia_get_first_tuple(link, &tuple));
623
624     cfg = &(parse.cftable_entry);
625     CS_CHECK(GetTupleData, pcmcia_get_tuple_data(link, &tuple));
626     CS_CHECK(ParseTuple, pcmcia_parse_tuple(link, &tuple, &parse));
627
628     if (cfg->flags & CISTPL_CFTABLE_DEFAULT) dflt = *cfg;
629     if (cfg->index == 0)
630             goto cs_failed;
631
632     link->conf.ConfigIndex = cfg->index;
633     link->conf.Attributes |= CONF_ENABLE_IRQ;
634         
635     /* IO window settings */
636     link->io.NumPorts1 = 0;
637     if ((cfg->io.nwin > 0) || (dflt.io.nwin > 0)) {
638             cistpl_io_t *io = (cfg->io.nwin) ? &cfg->io : &dflt.io;
639             link->io.Attributes1 = IO_DATA_PATH_WIDTH_AUTO;
640             if (!(io->flags & CISTPL_IO_8BIT))
641                     link->io.Attributes1 = IO_DATA_PATH_WIDTH_16;
642             if (!(io->flags & CISTPL_IO_16BIT))
643                     link->io.Attributes1 = IO_DATA_PATH_WIDTH_8;
644             link->io.IOAddrLines = io->flags & CISTPL_IO_LINES_MASK;
645             link->io.BasePort1 = io->win[0].base;
646             link->io.NumPorts1 = io->win[0].len;
647             CS_CHECK(RequestIO, pcmcia_request_io(link, &link->io));
648     }
649
650     link->conf.Attributes = CONF_ENABLE_IRQ;
651     link->conf.IntType = INT_MEMORY_AND_IO;
652     link->conf.ConfigIndex = 8;
653     link->conf.Present = PRESENT_OPTION;
654     
655     link->irq.Attributes |= IRQ_HANDLE_PRESENT;
656     link->irq.Handler     = mgslpc_isr;
657     link->irq.Instance    = info;
658     CS_CHECK(RequestIRQ, pcmcia_request_irq(link, &link->irq));
659
660     CS_CHECK(RequestConfiguration, pcmcia_request_configuration(link, &link->conf));
661
662     info->io_base = link->io.BasePort1;
663     info->irq_level = link->irq.AssignedIRQ;
664
665     /* add to linked list of devices */
666     sprintf(info->node.dev_name, "mgslpc0");
667     info->node.major = info->node.minor = 0;
668     link->dev_node = &info->node;
669
670     printk(KERN_INFO "%s: index 0x%02x:",
671            info->node.dev_name, link->conf.ConfigIndex);
672     if (link->conf.Attributes & CONF_ENABLE_IRQ)
673             printk(", irq %d", link->irq.AssignedIRQ);
674     if (link->io.NumPorts1)
675             printk(", io 0x%04x-0x%04x", link->io.BasePort1,
676                    link->io.BasePort1+link->io.NumPorts1-1);
677     printk("\n");
678     return 0;
679
680 cs_failed:
681     cs_error(link, last_fn, last_ret);
682     mgslpc_release((u_long)link);
683     return -ENODEV;
684 }
685
686 /* Card has been removed.
687  * Unregister device and release PCMCIA configuration.
688  * If device is open, postpone until it is closed.
689  */
690 static void mgslpc_release(u_long arg)
691 {
692         struct pcmcia_device *link = (struct pcmcia_device *)arg;
693
694         if (debug_level >= DEBUG_LEVEL_INFO)
695                 printk("mgslpc_release(0x%p)\n", link);
696
697         pcmcia_disable_device(link);
698 }
699
700 static void mgslpc_detach(struct pcmcia_device *link)
701 {
702         if (debug_level >= DEBUG_LEVEL_INFO)
703                 printk("mgslpc_detach(0x%p)\n", link);
704
705         ((MGSLPC_INFO *)link->priv)->stop = 1;
706         mgslpc_release((u_long)link);
707
708         mgslpc_remove_device((MGSLPC_INFO *)link->priv);
709 }
710
711 static int mgslpc_suspend(struct pcmcia_device *link)
712 {
713         MGSLPC_INFO *info = link->priv;
714
715         info->stop = 1;
716
717         return 0;
718 }
719
720 static int mgslpc_resume(struct pcmcia_device *link)
721 {
722         MGSLPC_INFO *info = link->priv;
723
724         info->stop = 0;
725
726         return 0;
727 }
728
729
730 static inline int mgslpc_paranoia_check(MGSLPC_INFO *info,
731                                         char *name, const char *routine)
732 {
733 #ifdef MGSLPC_PARANOIA_CHECK
734         static const char *badmagic =
735                 "Warning: bad magic number for mgsl struct (%s) in %s\n";
736         static const char *badinfo =
737                 "Warning: null mgslpc_info for (%s) in %s\n";
738
739         if (!info) {
740                 printk(badinfo, name, routine);
741                 return 1;
742         }
743         if (info->magic != MGSLPC_MAGIC) {
744                 printk(badmagic, name, routine);
745                 return 1;
746         }
747 #else
748         if (!info)
749                 return 1;
750 #endif
751         return 0;
752 }
753
754
755 #define CMD_RXFIFO      BIT7    // release current rx FIFO
756 #define CMD_RXRESET     BIT6    // receiver reset
757 #define CMD_RXFIFO_READ BIT5
758 #define CMD_START_TIMER BIT4
759 #define CMD_TXFIFO      BIT3    // release current tx FIFO
760 #define CMD_TXEOM       BIT1    // transmit end message
761 #define CMD_TXRESET     BIT0    // transmit reset
762
763 static BOOLEAN wait_command_complete(MGSLPC_INFO *info, unsigned char channel) 
764 {
765         int i = 0;
766         /* wait for command completion */ 
767         while (read_reg(info, (unsigned char)(channel+STAR)) & BIT2) {
768                 udelay(1);
769                 if (i++ == 1000)
770                         return FALSE;
771         }
772         return TRUE;
773 }
774
775 static void issue_command(MGSLPC_INFO *info, unsigned char channel, unsigned char cmd) 
776 {
777         wait_command_complete(info, channel);
778         write_reg(info, (unsigned char) (channel + CMDR), cmd);
779 }
780
781 static void tx_pause(struct tty_struct *tty)
782 {
783         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
784         unsigned long flags;
785         
786         if (mgslpc_paranoia_check(info, tty->name, "tx_pause"))
787                 return;
788         if (debug_level >= DEBUG_LEVEL_INFO)
789                 printk("tx_pause(%s)\n",info->device_name);     
790                 
791         spin_lock_irqsave(&info->lock,flags);
792         if (info->tx_enabled)
793                 tx_stop(info);
794         spin_unlock_irqrestore(&info->lock,flags);
795 }
796
797 static void tx_release(struct tty_struct *tty)
798 {
799         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
800         unsigned long flags;
801         
802         if (mgslpc_paranoia_check(info, tty->name, "tx_release"))
803                 return;
804         if (debug_level >= DEBUG_LEVEL_INFO)
805                 printk("tx_release(%s)\n",info->device_name);   
806                 
807         spin_lock_irqsave(&info->lock,flags);
808         if (!info->tx_enabled)
809                 tx_start(info);
810         spin_unlock_irqrestore(&info->lock,flags);
811 }
812
813 /* Return next bottom half action to perform.
814  * or 0 if nothing to do.
815  */
816 static int bh_action(MGSLPC_INFO *info)
817 {
818         unsigned long flags;
819         int rc = 0;
820         
821         spin_lock_irqsave(&info->lock,flags);
822
823         if (info->pending_bh & BH_RECEIVE) {
824                 info->pending_bh &= ~BH_RECEIVE;
825                 rc = BH_RECEIVE;
826         } else if (info->pending_bh & BH_TRANSMIT) {
827                 info->pending_bh &= ~BH_TRANSMIT;
828                 rc = BH_TRANSMIT;
829         } else if (info->pending_bh & BH_STATUS) {
830                 info->pending_bh &= ~BH_STATUS;
831                 rc = BH_STATUS;
832         }
833
834         if (!rc) {
835                 /* Mark BH routine as complete */
836                 info->bh_running   = 0;
837                 info->bh_requested = 0;
838         }
839         
840         spin_unlock_irqrestore(&info->lock,flags);
841         
842         return rc;
843 }
844
845 static void bh_handler(void* Context)
846 {
847         MGSLPC_INFO *info = (MGSLPC_INFO*)Context;
848         int action;
849
850         if (!info)
851                 return;
852                 
853         if (debug_level >= DEBUG_LEVEL_BH)
854                 printk( "%s(%d):bh_handler(%s) entry\n",
855                         __FILE__,__LINE__,info->device_name);
856         
857         info->bh_running = 1;
858
859         while((action = bh_action(info)) != 0) {
860         
861                 /* Process work item */
862                 if ( debug_level >= DEBUG_LEVEL_BH )
863                         printk( "%s(%d):bh_handler() work item action=%d\n",
864                                 __FILE__,__LINE__,action);
865
866                 switch (action) {
867                 
868                 case BH_RECEIVE:
869                         while(rx_get_frame(info));
870                         break;
871                 case BH_TRANSMIT:
872                         bh_transmit(info);
873                         break;
874                 case BH_STATUS:
875                         bh_status(info);
876                         break;
877                 default:
878                         /* unknown work item ID */
879                         printk("Unknown work item ID=%08X!\n", action);
880                         break;
881                 }
882         }
883
884         if (debug_level >= DEBUG_LEVEL_BH)
885                 printk( "%s(%d):bh_handler(%s) exit\n",
886                         __FILE__,__LINE__,info->device_name);
887 }
888
889 static void bh_transmit(MGSLPC_INFO *info)
890 {
891         struct tty_struct *tty = info->tty;
892         if (debug_level >= DEBUG_LEVEL_BH)
893                 printk("bh_transmit() entry on %s\n", info->device_name);
894
895         if (tty) {
896                 tty_wakeup(tty);
897                 wake_up_interruptible(&tty->write_wait);
898         }
899 }
900
901 static void bh_status(MGSLPC_INFO *info)
902 {
903         info->ri_chkcount = 0;
904         info->dsr_chkcount = 0;
905         info->dcd_chkcount = 0;
906         info->cts_chkcount = 0;
907 }
908
909 /* eom: non-zero = end of frame */ 
910 static void rx_ready_hdlc(MGSLPC_INFO *info, int eom)
911 {
912         unsigned char data[2];
913         unsigned char fifo_count, read_count, i;
914         RXBUF *buf = (RXBUF*)(info->rx_buf + (info->rx_put * info->rx_buf_size));
915
916         if (debug_level >= DEBUG_LEVEL_ISR)
917                 printk("%s(%d):rx_ready_hdlc(eom=%d)\n",__FILE__,__LINE__,eom);
918         
919         if (!info->rx_enabled)
920                 return;
921
922         if (info->rx_frame_count >= info->rx_buf_count) {
923                 /* no more free buffers */
924                 issue_command(info, CHA, CMD_RXRESET);
925                 info->pending_bh |= BH_RECEIVE;
926                 info->rx_overflow = 1;
927                 info->icount.buf_overrun++;
928                 return;
929         }
930
931         if (eom) {
932                 /* end of frame, get FIFO count from RBCL register */ 
933                 if (!(fifo_count = (unsigned char)(read_reg(info, CHA+RBCL) & 0x1f)))
934                         fifo_count = 32;
935         } else
936                 fifo_count = 32;
937         
938         do {
939                 if (fifo_count == 1) {
940                         read_count = 1;
941                         data[0] = read_reg(info, CHA + RXFIFO);
942                 } else {
943                         read_count = 2;
944                         *((unsigned short *) data) = read_reg16(info, CHA + RXFIFO);
945                 }
946                 fifo_count -= read_count;
947                 if (!fifo_count && eom)
948                         buf->status = data[--read_count];
949
950                 for (i = 0; i < read_count; i++) {
951                         if (buf->count >= info->max_frame_size) {
952                                 /* frame too large, reset receiver and reset current buffer */
953                                 issue_command(info, CHA, CMD_RXRESET);
954                                 buf->count = 0;
955                                 return;
956                         }
957                         *(buf->data + buf->count) = data[i];
958                         buf->count++;
959                 }
960         } while (fifo_count);
961
962         if (eom) {
963                 info->pending_bh |= BH_RECEIVE;
964                 info->rx_frame_count++;
965                 info->rx_put++;
966                 if (info->rx_put >= info->rx_buf_count)
967                         info->rx_put = 0;
968         }
969         issue_command(info, CHA, CMD_RXFIFO);
970 }
971
972 static void rx_ready_async(MGSLPC_INFO *info, int tcd)
973 {
974         unsigned char data, status, flag;
975         int fifo_count;
976         int work = 0;
977         struct tty_struct *tty = info->tty;
978         struct mgsl_icount *icount = &info->icount;
979
980         if (tcd) {
981                 /* early termination, get FIFO count from RBCL register */ 
982                 fifo_count = (unsigned char)(read_reg(info, CHA+RBCL) & 0x1f);
983
984                 /* Zero fifo count could mean 0 or 32 bytes available.
985                  * If BIT5 of STAR is set then at least 1 byte is available.
986                  */
987                 if (!fifo_count && (read_reg(info,CHA+STAR) & BIT5))
988                         fifo_count = 32;
989         } else
990                 fifo_count = 32;
991
992         tty_buffer_request_room(tty, fifo_count);
993         /* Flush received async data to receive data buffer. */ 
994         while (fifo_count) {
995                 data   = read_reg(info, CHA + RXFIFO);
996                 status = read_reg(info, CHA + RXFIFO);
997                 fifo_count -= 2;
998
999                 icount->rx++;
1000                 flag = TTY_NORMAL;
1001
1002                 // if no frameing/crc error then save data
1003                 // BIT7:parity error
1004                 // BIT6:framing error
1005
1006                 if (status & (BIT7 + BIT6)) {
1007                         if (status & BIT7) 
1008                                 icount->parity++;
1009                         else
1010                                 icount->frame++;
1011
1012                         /* discard char if tty control flags say so */
1013                         if (status & info->ignore_status_mask)
1014                                 continue;
1015                                 
1016                         status &= info->read_status_mask;
1017
1018                         if (status & BIT7)
1019                                 flag = TTY_PARITY;
1020                         else if (status & BIT6)
1021                                 flag = TTY_FRAME;
1022                 }
1023                 work += tty_insert_flip_char(tty, data, flag);
1024         }
1025         issue_command(info, CHA, CMD_RXFIFO);
1026
1027         if (debug_level >= DEBUG_LEVEL_ISR) {
1028                 printk("%s(%d):rx_ready_async",
1029                         __FILE__,__LINE__);
1030                 printk("%s(%d):rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
1031                         __FILE__,__LINE__,icount->rx,icount->brk,
1032                         icount->parity,icount->frame,icount->overrun);
1033         }
1034                         
1035         if (work)
1036                 tty_flip_buffer_push(tty);
1037 }
1038
1039
1040 static void tx_done(MGSLPC_INFO *info)
1041 {
1042         if (!info->tx_active)
1043                 return;
1044                         
1045         info->tx_active = 0;
1046         info->tx_aborting = 0;
1047
1048         if (info->params.mode == MGSL_MODE_ASYNC)
1049                 return;
1050
1051         info->tx_count = info->tx_put = info->tx_get = 0;
1052         del_timer(&info->tx_timer);     
1053         
1054         if (info->drop_rts_on_tx_done) {
1055                 get_signals(info);
1056                 if (info->serial_signals & SerialSignal_RTS) {
1057                         info->serial_signals &= ~SerialSignal_RTS;
1058                         set_signals(info);
1059                 }
1060                 info->drop_rts_on_tx_done = 0;
1061         }
1062
1063 #ifdef CONFIG_HDLC
1064         if (info->netcount)
1065                 hdlcdev_tx_done(info);
1066         else 
1067 #endif
1068         {
1069                 if (info->tty->stopped || info->tty->hw_stopped) {
1070                         tx_stop(info);
1071                         return;
1072                 }
1073                 info->pending_bh |= BH_TRANSMIT;
1074         }
1075 }
1076
1077 static void tx_ready(MGSLPC_INFO *info)
1078 {
1079         unsigned char fifo_count = 32;
1080         int c;
1081
1082         if (debug_level >= DEBUG_LEVEL_ISR)
1083                 printk("%s(%d):tx_ready(%s)\n", __FILE__,__LINE__,info->device_name);
1084
1085         if (info->params.mode == MGSL_MODE_HDLC) {
1086                 if (!info->tx_active)
1087                         return;
1088         } else {
1089                 if (info->tty->stopped || info->tty->hw_stopped) {
1090                         tx_stop(info);
1091                         return;
1092                 }
1093                 if (!info->tx_count)
1094                         info->tx_active = 0;
1095         }
1096
1097         if (!info->tx_count)
1098                 return;
1099
1100         while (info->tx_count && fifo_count) {
1101                 c = min(2, min_t(int, fifo_count, min(info->tx_count, TXBUFSIZE - info->tx_get)));
1102                 
1103                 if (c == 1) {
1104                         write_reg(info, CHA + TXFIFO, *(info->tx_buf + info->tx_get));
1105                 } else {
1106                         write_reg16(info, CHA + TXFIFO,
1107                                           *((unsigned short*)(info->tx_buf + info->tx_get)));
1108                 }
1109                 info->tx_count -= c;
1110                 info->tx_get = (info->tx_get + c) & (TXBUFSIZE - 1);
1111                 fifo_count -= c;
1112         }
1113
1114         if (info->params.mode == MGSL_MODE_ASYNC) {
1115                 if (info->tx_count < WAKEUP_CHARS)
1116                         info->pending_bh |= BH_TRANSMIT;
1117                 issue_command(info, CHA, CMD_TXFIFO);
1118         } else {
1119                 if (info->tx_count)
1120                         issue_command(info, CHA, CMD_TXFIFO);
1121                 else
1122                         issue_command(info, CHA, CMD_TXFIFO + CMD_TXEOM);
1123         }
1124 }
1125
1126 static void cts_change(MGSLPC_INFO *info)
1127 {
1128         get_signals(info);
1129         if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1130                 irq_disable(info, CHB, IRQ_CTS);
1131         info->icount.cts++;
1132         if (info->serial_signals & SerialSignal_CTS)
1133                 info->input_signal_events.cts_up++;
1134         else
1135                 info->input_signal_events.cts_down++;
1136         wake_up_interruptible(&info->status_event_wait_q);
1137         wake_up_interruptible(&info->event_wait_q);
1138
1139         if (info->flags & ASYNC_CTS_FLOW) {
1140                 if (info->tty->hw_stopped) {
1141                         if (info->serial_signals & SerialSignal_CTS) {
1142                                 if (debug_level >= DEBUG_LEVEL_ISR)
1143                                         printk("CTS tx start...");
1144                                 if (info->tty)
1145                                         info->tty->hw_stopped = 0;
1146                                 tx_start(info);
1147                                 info->pending_bh |= BH_TRANSMIT;
1148                                 return;
1149                         }
1150                 } else {
1151                         if (!(info->serial_signals & SerialSignal_CTS)) {
1152                                 if (debug_level >= DEBUG_LEVEL_ISR)
1153                                         printk("CTS tx stop...");
1154                                 if (info->tty)
1155                                         info->tty->hw_stopped = 1;
1156                                 tx_stop(info);
1157                         }
1158                 }
1159         }
1160         info->pending_bh |= BH_STATUS;
1161 }
1162
1163 static void dcd_change(MGSLPC_INFO *info)
1164 {
1165         get_signals(info);
1166         if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1167                 irq_disable(info, CHB, IRQ_DCD);
1168         info->icount.dcd++;
1169         if (info->serial_signals & SerialSignal_DCD) {
1170                 info->input_signal_events.dcd_up++;
1171         }
1172         else
1173                 info->input_signal_events.dcd_down++;
1174 #ifdef CONFIG_HDLC
1175         if (info->netcount) {
1176                 if (info->serial_signals & SerialSignal_DCD)
1177                         netif_carrier_on(info->netdev);
1178                 else
1179                         netif_carrier_off(info->netdev);
1180         }
1181 #endif
1182         wake_up_interruptible(&info->status_event_wait_q);
1183         wake_up_interruptible(&info->event_wait_q);
1184
1185         if (info->flags & ASYNC_CHECK_CD) {
1186                 if (debug_level >= DEBUG_LEVEL_ISR)
1187                         printk("%s CD now %s...", info->device_name,
1188                                (info->serial_signals & SerialSignal_DCD) ? "on" : "off");
1189                 if (info->serial_signals & SerialSignal_DCD)
1190                         wake_up_interruptible(&info->open_wait);
1191                 else {
1192                         if (debug_level >= DEBUG_LEVEL_ISR)
1193                                 printk("doing serial hangup...");
1194                         if (info->tty)
1195                                 tty_hangup(info->tty);
1196                 }
1197         }
1198         info->pending_bh |= BH_STATUS;
1199 }
1200
1201 static void dsr_change(MGSLPC_INFO *info)
1202 {
1203         get_signals(info);
1204         if ((info->dsr_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1205                 port_irq_disable(info, PVR_DSR);
1206         info->icount.dsr++;
1207         if (info->serial_signals & SerialSignal_DSR)
1208                 info->input_signal_events.dsr_up++;
1209         else
1210                 info->input_signal_events.dsr_down++;
1211         wake_up_interruptible(&info->status_event_wait_q);
1212         wake_up_interruptible(&info->event_wait_q);
1213         info->pending_bh |= BH_STATUS;
1214 }
1215
1216 static void ri_change(MGSLPC_INFO *info)
1217 {
1218         get_signals(info);
1219         if ((info->ri_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1220                 port_irq_disable(info, PVR_RI);
1221         info->icount.rng++;
1222         if (info->serial_signals & SerialSignal_RI)
1223                 info->input_signal_events.ri_up++;
1224         else
1225                 info->input_signal_events.ri_down++;
1226         wake_up_interruptible(&info->status_event_wait_q);
1227         wake_up_interruptible(&info->event_wait_q);
1228         info->pending_bh |= BH_STATUS;
1229 }
1230
1231 /* Interrupt service routine entry point.
1232  *      
1233  * Arguments:
1234  * 
1235  * irq     interrupt number that caused interrupt
1236  * dev_id  device ID supplied during interrupt registration
1237  */
1238 static irqreturn_t mgslpc_isr(int irq, void *dev_id)
1239 {
1240         MGSLPC_INFO * info = (MGSLPC_INFO *)dev_id;
1241         unsigned short isr;
1242         unsigned char gis, pis;
1243         int count=0;
1244
1245         if (debug_level >= DEBUG_LEVEL_ISR)     
1246                 printk("mgslpc_isr(%d) entry.\n", irq);
1247         if (!info)
1248                 return IRQ_NONE;
1249                 
1250         if (!(info->p_dev->_locked))
1251                 return IRQ_HANDLED;
1252
1253         spin_lock(&info->lock);
1254
1255         while ((gis = read_reg(info, CHA + GIS))) {
1256                 if (debug_level >= DEBUG_LEVEL_ISR)     
1257                         printk("mgslpc_isr %s gis=%04X\n", info->device_name,gis);
1258
1259                 if ((gis & 0x70) || count > 1000) {
1260                         printk("synclink_cs:hardware failed or ejected\n");
1261                         break;
1262                 }
1263                 count++;
1264
1265                 if (gis & (BIT1 + BIT0)) {
1266                         isr = read_reg16(info, CHB + ISR);
1267                         if (isr & IRQ_DCD)
1268                                 dcd_change(info);
1269                         if (isr & IRQ_CTS)
1270                                 cts_change(info);
1271                 }
1272                 if (gis & (BIT3 + BIT2))
1273                 {
1274                         isr = read_reg16(info, CHA + ISR);
1275                         if (isr & IRQ_TIMER) {
1276                                 info->irq_occurred = 1;
1277                                 irq_disable(info, CHA, IRQ_TIMER);
1278                         }
1279
1280                         /* receive IRQs */ 
1281                         if (isr & IRQ_EXITHUNT) {
1282                                 info->icount.exithunt++;
1283                                 wake_up_interruptible(&info->event_wait_q);
1284                         }
1285                         if (isr & IRQ_BREAK_ON) {
1286                                 info->icount.brk++;
1287                                 if (info->flags & ASYNC_SAK)
1288                                         do_SAK(info->tty);
1289                         }
1290                         if (isr & IRQ_RXTIME) {
1291                                 issue_command(info, CHA, CMD_RXFIFO_READ);
1292                         }
1293                         if (isr & (IRQ_RXEOM + IRQ_RXFIFO)) {
1294                                 if (info->params.mode == MGSL_MODE_HDLC)
1295                                         rx_ready_hdlc(info, isr & IRQ_RXEOM); 
1296                                 else
1297                                         rx_ready_async(info, isr & IRQ_RXEOM);
1298                         }
1299
1300                         /* transmit IRQs */ 
1301                         if (isr & IRQ_UNDERRUN) {
1302                                 if (info->tx_aborting)
1303                                         info->icount.txabort++;
1304                                 else
1305                                         info->icount.txunder++;
1306                                 tx_done(info);
1307                         }
1308                         else if (isr & IRQ_ALLSENT) {
1309                                 info->icount.txok++;
1310                                 tx_done(info);
1311                         }
1312                         else if (isr & IRQ_TXFIFO)
1313                                 tx_ready(info);
1314                 }
1315                 if (gis & BIT7) {
1316                         pis = read_reg(info, CHA + PIS);
1317                         if (pis & BIT1)
1318                                 dsr_change(info);
1319                         if (pis & BIT2)
1320                                 ri_change(info);
1321                 }
1322         }
1323         
1324         /* Request bottom half processing if there's something 
1325          * for it to do and the bh is not already running
1326          */
1327
1328         if (info->pending_bh && !info->bh_running && !info->bh_requested) {
1329                 if ( debug_level >= DEBUG_LEVEL_ISR )   
1330                         printk("%s(%d):%s queueing bh task.\n",
1331                                 __FILE__,__LINE__,info->device_name);
1332                 schedule_work(&info->task);
1333                 info->bh_requested = 1;
1334         }
1335
1336         spin_unlock(&info->lock);
1337         
1338         if (debug_level >= DEBUG_LEVEL_ISR)     
1339                 printk("%s(%d):mgslpc_isr(%d)exit.\n",
1340                        __FILE__,__LINE__,irq);
1341
1342         return IRQ_HANDLED;
1343 }
1344
1345 /* Initialize and start device.
1346  */
1347 static int startup(MGSLPC_INFO * info)
1348 {
1349         int retval = 0;
1350         
1351         if (debug_level >= DEBUG_LEVEL_INFO)
1352                 printk("%s(%d):startup(%s)\n",__FILE__,__LINE__,info->device_name);
1353                 
1354         if (info->flags & ASYNC_INITIALIZED)
1355                 return 0;
1356         
1357         if (!info->tx_buf) {
1358                 /* allocate a page of memory for a transmit buffer */
1359                 info->tx_buf = (unsigned char *)get_zeroed_page(GFP_KERNEL);
1360                 if (!info->tx_buf) {
1361                         printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
1362                                 __FILE__,__LINE__,info->device_name);
1363                         return -ENOMEM;
1364                 }
1365         }
1366
1367         info->pending_bh = 0;
1368         
1369         memset(&info->icount, 0, sizeof(info->icount));
1370
1371         init_timer(&info->tx_timer);
1372         info->tx_timer.data = (unsigned long)info;
1373         info->tx_timer.function = tx_timeout;
1374
1375         /* Allocate and claim adapter resources */
1376         retval = claim_resources(info);
1377         
1378         /* perform existance check and diagnostics */
1379         if ( !retval )
1380                 retval = adapter_test(info);
1381                 
1382         if ( retval ) {
1383                 if (capable(CAP_SYS_ADMIN) && info->tty)
1384                         set_bit(TTY_IO_ERROR, &info->tty->flags);
1385                 release_resources(info);
1386                 return retval;
1387         }
1388
1389         /* program hardware for current parameters */
1390         mgslpc_change_params(info);
1391         
1392         if (info->tty)
1393                 clear_bit(TTY_IO_ERROR, &info->tty->flags);
1394
1395         info->flags |= ASYNC_INITIALIZED;
1396         
1397         return 0;
1398 }
1399
1400 /* Called by mgslpc_close() and mgslpc_hangup() to shutdown hardware
1401  */
1402 static void shutdown(MGSLPC_INFO * info)
1403 {
1404         unsigned long flags;
1405         
1406         if (!(info->flags & ASYNC_INITIALIZED))
1407                 return;
1408
1409         if (debug_level >= DEBUG_LEVEL_INFO)
1410                 printk("%s(%d):mgslpc_shutdown(%s)\n",
1411                          __FILE__,__LINE__, info->device_name );
1412
1413         /* clear status wait queue because status changes */
1414         /* can't happen after shutting down the hardware */
1415         wake_up_interruptible(&info->status_event_wait_q);
1416         wake_up_interruptible(&info->event_wait_q);
1417
1418         del_timer(&info->tx_timer);     
1419
1420         if (info->tx_buf) {
1421                 free_page((unsigned long) info->tx_buf);
1422                 info->tx_buf = NULL;
1423         }
1424
1425         spin_lock_irqsave(&info->lock,flags);
1426
1427         rx_stop(info);
1428         tx_stop(info);
1429
1430         /* TODO:disable interrupts instead of reset to preserve signal states */
1431         reset_device(info);
1432         
1433         if (!info->tty || info->tty->termios->c_cflag & HUPCL) {
1434                 info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
1435                 set_signals(info);
1436         }
1437         
1438         spin_unlock_irqrestore(&info->lock,flags);
1439
1440         release_resources(info);        
1441         
1442         if (info->tty)
1443                 set_bit(TTY_IO_ERROR, &info->tty->flags);
1444
1445         info->flags &= ~ASYNC_INITIALIZED;
1446 }
1447
1448 static void mgslpc_program_hw(MGSLPC_INFO *info)
1449 {
1450         unsigned long flags;
1451
1452         spin_lock_irqsave(&info->lock,flags);
1453         
1454         rx_stop(info);
1455         tx_stop(info);
1456         info->tx_count = info->tx_put = info->tx_get = 0;
1457         
1458         if (info->params.mode == MGSL_MODE_HDLC || info->netcount)
1459                 hdlc_mode(info);
1460         else
1461                 async_mode(info);
1462                 
1463         set_signals(info);
1464         
1465         info->dcd_chkcount = 0;
1466         info->cts_chkcount = 0;
1467         info->ri_chkcount = 0;
1468         info->dsr_chkcount = 0;
1469
1470         irq_enable(info, CHB, IRQ_DCD | IRQ_CTS);
1471         port_irq_enable(info, (unsigned char) PVR_DSR | PVR_RI);
1472         get_signals(info);
1473                 
1474         if (info->netcount || info->tty->termios->c_cflag & CREAD)
1475                 rx_start(info);
1476                 
1477         spin_unlock_irqrestore(&info->lock,flags);
1478 }
1479
1480 /* Reconfigure adapter based on new parameters
1481  */
1482 static void mgslpc_change_params(MGSLPC_INFO *info)
1483 {
1484         unsigned cflag;
1485         int bits_per_char;
1486
1487         if (!info->tty || !info->tty->termios)
1488                 return;
1489                 
1490         if (debug_level >= DEBUG_LEVEL_INFO)
1491                 printk("%s(%d):mgslpc_change_params(%s)\n",
1492                          __FILE__,__LINE__, info->device_name );
1493                          
1494         cflag = info->tty->termios->c_cflag;
1495
1496         /* if B0 rate (hangup) specified then negate DTR and RTS */
1497         /* otherwise assert DTR and RTS */
1498         if (cflag & CBAUD)
1499                 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
1500         else
1501                 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
1502         
1503         /* byte size and parity */
1504         
1505         switch (cflag & CSIZE) {
1506         case CS5: info->params.data_bits = 5; break;
1507         case CS6: info->params.data_bits = 6; break;
1508         case CS7: info->params.data_bits = 7; break;
1509         case CS8: info->params.data_bits = 8; break;
1510         default:  info->params.data_bits = 7; break;
1511         }
1512               
1513         if (cflag & CSTOPB)
1514                 info->params.stop_bits = 2;
1515         else
1516                 info->params.stop_bits = 1;
1517
1518         info->params.parity = ASYNC_PARITY_NONE;
1519         if (cflag & PARENB) {
1520                 if (cflag & PARODD)
1521                         info->params.parity = ASYNC_PARITY_ODD;
1522                 else
1523                         info->params.parity = ASYNC_PARITY_EVEN;
1524 #ifdef CMSPAR
1525                 if (cflag & CMSPAR)
1526                         info->params.parity = ASYNC_PARITY_SPACE;
1527 #endif
1528         }
1529
1530         /* calculate number of jiffies to transmit a full
1531          * FIFO (32 bytes) at specified data rate
1532          */
1533         bits_per_char = info->params.data_bits + 
1534                         info->params.stop_bits + 1;
1535
1536         /* if port data rate is set to 460800 or less then
1537          * allow tty settings to override, otherwise keep the
1538          * current data rate.
1539          */
1540         if (info->params.data_rate <= 460800) {
1541                 info->params.data_rate = tty_get_baud_rate(info->tty);
1542         }
1543         
1544         if ( info->params.data_rate ) {
1545                 info->timeout = (32*HZ*bits_per_char) / 
1546                                 info->params.data_rate;
1547         }
1548         info->timeout += HZ/50;         /* Add .02 seconds of slop */
1549
1550         if (cflag & CRTSCTS)
1551                 info->flags |= ASYNC_CTS_FLOW;
1552         else
1553                 info->flags &= ~ASYNC_CTS_FLOW;
1554                 
1555         if (cflag & CLOCAL)
1556                 info->flags &= ~ASYNC_CHECK_CD;
1557         else
1558                 info->flags |= ASYNC_CHECK_CD;
1559
1560         /* process tty input control flags */
1561         
1562         info->read_status_mask = 0;
1563         if (I_INPCK(info->tty))
1564                 info->read_status_mask |= BIT7 | BIT6;
1565         if (I_IGNPAR(info->tty))
1566                 info->ignore_status_mask |= BIT7 | BIT6;
1567
1568         mgslpc_program_hw(info);
1569 }
1570
1571 /* Add a character to the transmit buffer
1572  */
1573 static void mgslpc_put_char(struct tty_struct *tty, unsigned char ch)
1574 {
1575         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1576         unsigned long flags;
1577
1578         if (debug_level >= DEBUG_LEVEL_INFO) {
1579                 printk( "%s(%d):mgslpc_put_char(%d) on %s\n",
1580                         __FILE__,__LINE__,ch,info->device_name);
1581         }
1582
1583         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_put_char"))
1584                 return;
1585
1586         if (!info->tx_buf)
1587                 return;
1588
1589         spin_lock_irqsave(&info->lock,flags);
1590         
1591         if (info->params.mode == MGSL_MODE_ASYNC || !info->tx_active) {
1592                 if (info->tx_count < TXBUFSIZE - 1) {
1593                         info->tx_buf[info->tx_put++] = ch;
1594                         info->tx_put &= TXBUFSIZE-1;
1595                         info->tx_count++;
1596                 }
1597         }
1598         
1599         spin_unlock_irqrestore(&info->lock,flags);
1600 }
1601
1602 /* Enable transmitter so remaining characters in the
1603  * transmit buffer are sent.
1604  */
1605 static void mgslpc_flush_chars(struct tty_struct *tty)
1606 {
1607         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1608         unsigned long flags;
1609                                 
1610         if (debug_level >= DEBUG_LEVEL_INFO)
1611                 printk( "%s(%d):mgslpc_flush_chars() entry on %s tx_count=%d\n",
1612                         __FILE__,__LINE__,info->device_name,info->tx_count);
1613         
1614         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_flush_chars"))
1615                 return;
1616
1617         if (info->tx_count <= 0 || tty->stopped ||
1618             tty->hw_stopped || !info->tx_buf)
1619                 return;
1620
1621         if (debug_level >= DEBUG_LEVEL_INFO)
1622                 printk( "%s(%d):mgslpc_flush_chars() entry on %s starting transmitter\n",
1623                         __FILE__,__LINE__,info->device_name);
1624
1625         spin_lock_irqsave(&info->lock,flags);
1626         if (!info->tx_active)
1627                 tx_start(info);
1628         spin_unlock_irqrestore(&info->lock,flags);
1629 }
1630
1631 /* Send a block of data
1632  *      
1633  * Arguments:
1634  * 
1635  * tty        pointer to tty information structure
1636  * buf        pointer to buffer containing send data
1637  * count      size of send data in bytes
1638  *      
1639  * Returns: number of characters written
1640  */
1641 static int mgslpc_write(struct tty_struct * tty,
1642                         const unsigned char *buf, int count)
1643 {
1644         int c, ret = 0;
1645         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1646         unsigned long flags;
1647         
1648         if (debug_level >= DEBUG_LEVEL_INFO)
1649                 printk( "%s(%d):mgslpc_write(%s) count=%d\n",
1650                         __FILE__,__LINE__,info->device_name,count);
1651         
1652         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_write") ||
1653                 !info->tx_buf)
1654                 goto cleanup;
1655
1656         if (info->params.mode == MGSL_MODE_HDLC) {
1657                 if (count > TXBUFSIZE) {
1658                         ret = -EIO;
1659                         goto cleanup;
1660                 }
1661                 if (info->tx_active)
1662                         goto cleanup;
1663                 else if (info->tx_count)
1664                         goto start;
1665         }
1666
1667         for (;;) {
1668                 c = min(count,
1669                         min(TXBUFSIZE - info->tx_count - 1,
1670                             TXBUFSIZE - info->tx_put));
1671                 if (c <= 0)
1672                         break;
1673                         
1674                 memcpy(info->tx_buf + info->tx_put, buf, c);
1675
1676                 spin_lock_irqsave(&info->lock,flags);
1677                 info->tx_put = (info->tx_put + c) & (TXBUFSIZE-1);
1678                 info->tx_count += c;
1679                 spin_unlock_irqrestore(&info->lock,flags);
1680
1681                 buf += c;
1682                 count -= c;
1683                 ret += c;
1684         }
1685 start:
1686         if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
1687                 spin_lock_irqsave(&info->lock,flags);
1688                 if (!info->tx_active)
1689                         tx_start(info);
1690                 spin_unlock_irqrestore(&info->lock,flags);
1691         }
1692 cleanup:        
1693         if (debug_level >= DEBUG_LEVEL_INFO)
1694                 printk( "%s(%d):mgslpc_write(%s) returning=%d\n",
1695                         __FILE__,__LINE__,info->device_name,ret);
1696         return ret;
1697 }
1698
1699 /* Return the count of free bytes in transmit buffer
1700  */
1701 static int mgslpc_write_room(struct tty_struct *tty)
1702 {
1703         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1704         int ret;
1705                                 
1706         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_write_room"))
1707                 return 0;
1708
1709         if (info->params.mode == MGSL_MODE_HDLC) {
1710                 /* HDLC (frame oriented) mode */
1711                 if (info->tx_active)
1712                         return 0;
1713                 else
1714                         return HDLC_MAX_FRAME_SIZE;
1715         } else {
1716                 ret = TXBUFSIZE - info->tx_count - 1;
1717                 if (ret < 0)
1718                         ret = 0;
1719         }
1720         
1721         if (debug_level >= DEBUG_LEVEL_INFO)
1722                 printk("%s(%d):mgslpc_write_room(%s)=%d\n",
1723                          __FILE__,__LINE__, info->device_name, ret);
1724         return ret;
1725 }
1726
1727 /* Return the count of bytes in transmit buffer
1728  */
1729 static int mgslpc_chars_in_buffer(struct tty_struct *tty)
1730 {
1731         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1732         int rc;
1733                  
1734         if (debug_level >= DEBUG_LEVEL_INFO)
1735                 printk("%s(%d):mgslpc_chars_in_buffer(%s)\n",
1736                          __FILE__,__LINE__, info->device_name );
1737                          
1738         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_chars_in_buffer"))
1739                 return 0;
1740                 
1741         if (info->params.mode == MGSL_MODE_HDLC)
1742                 rc = info->tx_active ? info->max_frame_size : 0;
1743         else
1744                 rc = info->tx_count;
1745
1746         if (debug_level >= DEBUG_LEVEL_INFO)
1747                 printk("%s(%d):mgslpc_chars_in_buffer(%s)=%d\n",
1748                          __FILE__,__LINE__, info->device_name, rc);
1749                          
1750         return rc;
1751 }
1752
1753 /* Discard all data in the send buffer
1754  */
1755 static void mgslpc_flush_buffer(struct tty_struct *tty)
1756 {
1757         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1758         unsigned long flags;
1759         
1760         if (debug_level >= DEBUG_LEVEL_INFO)
1761                 printk("%s(%d):mgslpc_flush_buffer(%s) entry\n",
1762                          __FILE__,__LINE__, info->device_name );
1763         
1764         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_flush_buffer"))
1765                 return;
1766                 
1767         spin_lock_irqsave(&info->lock,flags); 
1768         info->tx_count = info->tx_put = info->tx_get = 0;
1769         del_timer(&info->tx_timer);     
1770         spin_unlock_irqrestore(&info->lock,flags);
1771
1772         wake_up_interruptible(&tty->write_wait);
1773         tty_wakeup(tty);
1774 }
1775
1776 /* Send a high-priority XON/XOFF character
1777  */
1778 static void mgslpc_send_xchar(struct tty_struct *tty, char ch)
1779 {
1780         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1781         unsigned long flags;
1782
1783         if (debug_level >= DEBUG_LEVEL_INFO)
1784                 printk("%s(%d):mgslpc_send_xchar(%s,%d)\n",
1785                          __FILE__,__LINE__, info->device_name, ch );
1786                          
1787         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_send_xchar"))
1788                 return;
1789
1790         info->x_char = ch;
1791         if (ch) {
1792                 spin_lock_irqsave(&info->lock,flags);
1793                 if (!info->tx_enabled)
1794                         tx_start(info);
1795                 spin_unlock_irqrestore(&info->lock,flags);
1796         }
1797 }
1798
1799 /* Signal remote device to throttle send data (our receive data)
1800  */
1801 static void mgslpc_throttle(struct tty_struct * tty)
1802 {
1803         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1804         unsigned long flags;
1805         
1806         if (debug_level >= DEBUG_LEVEL_INFO)
1807                 printk("%s(%d):mgslpc_throttle(%s) entry\n",
1808                          __FILE__,__LINE__, info->device_name );
1809
1810         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_throttle"))
1811                 return;
1812         
1813         if (I_IXOFF(tty))
1814                 mgslpc_send_xchar(tty, STOP_CHAR(tty));
1815  
1816         if (tty->termios->c_cflag & CRTSCTS) {
1817                 spin_lock_irqsave(&info->lock,flags);
1818                 info->serial_signals &= ~SerialSignal_RTS;
1819                 set_signals(info);
1820                 spin_unlock_irqrestore(&info->lock,flags);
1821         }
1822 }
1823
1824 /* Signal remote device to stop throttling send data (our receive data)
1825  */
1826 static void mgslpc_unthrottle(struct tty_struct * tty)
1827 {
1828         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1829         unsigned long flags;
1830         
1831         if (debug_level >= DEBUG_LEVEL_INFO)
1832                 printk("%s(%d):mgslpc_unthrottle(%s) entry\n",
1833                          __FILE__,__LINE__, info->device_name );
1834
1835         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_unthrottle"))
1836                 return;
1837         
1838         if (I_IXOFF(tty)) {
1839                 if (info->x_char)
1840                         info->x_char = 0;
1841                 else
1842                         mgslpc_send_xchar(tty, START_CHAR(tty));
1843         }
1844         
1845         if (tty->termios->c_cflag & CRTSCTS) {
1846                 spin_lock_irqsave(&info->lock,flags);
1847                 info->serial_signals |= SerialSignal_RTS;
1848                 set_signals(info);
1849                 spin_unlock_irqrestore(&info->lock,flags);
1850         }
1851 }
1852
1853 /* get the current serial statistics
1854  */
1855 static int get_stats(MGSLPC_INFO * info, struct mgsl_icount __user *user_icount)
1856 {
1857         int err;
1858         if (debug_level >= DEBUG_LEVEL_INFO)
1859                 printk("get_params(%s)\n", info->device_name);
1860         if (!user_icount) {
1861                 memset(&info->icount, 0, sizeof(info->icount));
1862         } else {
1863                 COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
1864                 if (err)
1865                         return -EFAULT;
1866         }
1867         return 0;
1868 }
1869
1870 /* get the current serial parameters
1871  */
1872 static int get_params(MGSLPC_INFO * info, MGSL_PARAMS __user *user_params)
1873 {
1874         int err;
1875         if (debug_level >= DEBUG_LEVEL_INFO)
1876                 printk("get_params(%s)\n", info->device_name);
1877         COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
1878         if (err)
1879                 return -EFAULT;
1880         return 0;
1881 }
1882
1883 /* set the serial parameters
1884  *      
1885  * Arguments:
1886  * 
1887  *      info            pointer to device instance data
1888  *      new_params      user buffer containing new serial params
1889  *
1890  * Returns:     0 if success, otherwise error code
1891  */
1892 static int set_params(MGSLPC_INFO * info, MGSL_PARAMS __user *new_params)
1893 {
1894         unsigned long flags;
1895         MGSL_PARAMS tmp_params;
1896         int err;
1897  
1898         if (debug_level >= DEBUG_LEVEL_INFO)
1899                 printk("%s(%d):set_params %s\n", __FILE__,__LINE__,
1900                         info->device_name );
1901         COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
1902         if (err) {
1903                 if ( debug_level >= DEBUG_LEVEL_INFO )
1904                         printk( "%s(%d):set_params(%s) user buffer copy failed\n",
1905                                 __FILE__,__LINE__,info->device_name);
1906                 return -EFAULT;
1907         }
1908         
1909         spin_lock_irqsave(&info->lock,flags);
1910         memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
1911         spin_unlock_irqrestore(&info->lock,flags);
1912         
1913         mgslpc_change_params(info);
1914         
1915         return 0;
1916 }
1917
1918 static int get_txidle(MGSLPC_INFO * info, int __user *idle_mode)
1919 {
1920         int err;
1921         if (debug_level >= DEBUG_LEVEL_INFO)
1922                 printk("get_txidle(%s)=%d\n", info->device_name, info->idle_mode);
1923         COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
1924         if (err)
1925                 return -EFAULT;
1926         return 0;
1927 }
1928
1929 static int set_txidle(MGSLPC_INFO * info, int idle_mode)
1930 {
1931         unsigned long flags;
1932         if (debug_level >= DEBUG_LEVEL_INFO)
1933                 printk("set_txidle(%s,%d)\n", info->device_name, idle_mode);
1934         spin_lock_irqsave(&info->lock,flags);
1935         info->idle_mode = idle_mode;
1936         tx_set_idle(info);
1937         spin_unlock_irqrestore(&info->lock,flags);
1938         return 0;
1939 }
1940
1941 static int get_interface(MGSLPC_INFO * info, int __user *if_mode)
1942 {
1943         int err;
1944         if (debug_level >= DEBUG_LEVEL_INFO)
1945                 printk("get_interface(%s)=%d\n", info->device_name, info->if_mode);
1946         COPY_TO_USER(err,if_mode, &info->if_mode, sizeof(int));
1947         if (err)
1948                 return -EFAULT;
1949         return 0;
1950 }
1951
1952 static int set_interface(MGSLPC_INFO * info, int if_mode)
1953 {
1954         unsigned long flags;
1955         unsigned char val;
1956         if (debug_level >= DEBUG_LEVEL_INFO)
1957                 printk("set_interface(%s,%d)\n", info->device_name, if_mode);
1958         spin_lock_irqsave(&info->lock,flags);
1959         info->if_mode = if_mode;
1960
1961         val = read_reg(info, PVR) & 0x0f;
1962         switch (info->if_mode)
1963         {
1964         case MGSL_INTERFACE_RS232: val |= PVR_RS232; break;
1965         case MGSL_INTERFACE_V35:   val |= PVR_V35;   break;
1966         case MGSL_INTERFACE_RS422: val |= PVR_RS422; break;
1967         }
1968         write_reg(info, PVR, val);
1969
1970         spin_unlock_irqrestore(&info->lock,flags);
1971         return 0;
1972 }
1973
1974 static int set_txenable(MGSLPC_INFO * info, int enable)
1975 {
1976         unsigned long flags;
1977  
1978         if (debug_level >= DEBUG_LEVEL_INFO)
1979                 printk("set_txenable(%s,%d)\n", info->device_name, enable);
1980                         
1981         spin_lock_irqsave(&info->lock,flags);
1982         if (enable) {
1983                 if (!info->tx_enabled)
1984                         tx_start(info);
1985         } else {
1986                 if (info->tx_enabled)
1987                         tx_stop(info);
1988         }
1989         spin_unlock_irqrestore(&info->lock,flags);
1990         return 0;
1991 }
1992
1993 static int tx_abort(MGSLPC_INFO * info)
1994 {
1995         unsigned long flags;
1996  
1997         if (debug_level >= DEBUG_LEVEL_INFO)
1998                 printk("tx_abort(%s)\n", info->device_name);
1999                         
2000         spin_lock_irqsave(&info->lock,flags);
2001         if (info->tx_active && info->tx_count &&
2002             info->params.mode == MGSL_MODE_HDLC) {
2003                 /* clear data count so FIFO is not filled on next IRQ.
2004                  * This results in underrun and abort transmission.
2005                  */
2006                 info->tx_count = info->tx_put = info->tx_get = 0;
2007                 info->tx_aborting = TRUE;
2008         }
2009         spin_unlock_irqrestore(&info->lock,flags);
2010         return 0;
2011 }
2012
2013 static int set_rxenable(MGSLPC_INFO * info, int enable)
2014 {
2015         unsigned long flags;
2016  
2017         if (debug_level >= DEBUG_LEVEL_INFO)
2018                 printk("set_rxenable(%s,%d)\n", info->device_name, enable);
2019                         
2020         spin_lock_irqsave(&info->lock,flags);
2021         if (enable) {
2022                 if (!info->rx_enabled)
2023                         rx_start(info);
2024         } else {
2025                 if (info->rx_enabled)
2026                         rx_stop(info);
2027         }
2028         spin_unlock_irqrestore(&info->lock,flags);
2029         return 0;
2030 }
2031
2032 /* wait for specified event to occur
2033  *      
2034  * Arguments:           info    pointer to device instance data
2035  *                      mask    pointer to bitmask of events to wait for
2036  * Return Value:        0       if successful and bit mask updated with
2037  *                              of events triggerred,
2038  *                      otherwise error code
2039  */
2040 static int wait_events(MGSLPC_INFO * info, int __user *mask_ptr)
2041 {
2042         unsigned long flags;
2043         int s;
2044         int rc=0;
2045         struct mgsl_icount cprev, cnow;
2046         int events;
2047         int mask;
2048         struct  _input_signal_events oldsigs, newsigs;
2049         DECLARE_WAITQUEUE(wait, current);
2050
2051         COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
2052         if (rc)
2053                 return  -EFAULT;
2054                  
2055         if (debug_level >= DEBUG_LEVEL_INFO)
2056                 printk("wait_events(%s,%d)\n", info->device_name, mask);
2057
2058         spin_lock_irqsave(&info->lock,flags);
2059
2060         /* return immediately if state matches requested events */
2061         get_signals(info);
2062         s = info->serial_signals;
2063         events = mask &
2064                 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
2065                   ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
2066                   ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
2067                   ((s & SerialSignal_RI)  ? MgslEvent_RiActive :MgslEvent_RiInactive) );
2068         if (events) {
2069                 spin_unlock_irqrestore(&info->lock,flags);
2070                 goto exit;
2071         }
2072
2073         /* save current irq counts */
2074         cprev = info->icount;
2075         oldsigs = info->input_signal_events;
2076         
2077         if ((info->params.mode == MGSL_MODE_HDLC) &&
2078             (mask & MgslEvent_ExitHuntMode))
2079                 irq_enable(info, CHA, IRQ_EXITHUNT);
2080         
2081         set_current_state(TASK_INTERRUPTIBLE);
2082         add_wait_queue(&info->event_wait_q, &wait);
2083         
2084         spin_unlock_irqrestore(&info->lock,flags);
2085         
2086         
2087         for(;;) {
2088                 schedule();
2089                 if (signal_pending(current)) {
2090                         rc = -ERESTARTSYS;
2091                         break;
2092                 }
2093                         
2094                 /* get current irq counts */
2095                 spin_lock_irqsave(&info->lock,flags);
2096                 cnow = info->icount;
2097                 newsigs = info->input_signal_events;
2098                 set_current_state(TASK_INTERRUPTIBLE);
2099                 spin_unlock_irqrestore(&info->lock,flags);
2100
2101                 /* if no change, wait aborted for some reason */
2102                 if (newsigs.dsr_up   == oldsigs.dsr_up   &&
2103                     newsigs.dsr_down == oldsigs.dsr_down &&
2104                     newsigs.dcd_up   == oldsigs.dcd_up   &&
2105                     newsigs.dcd_down == oldsigs.dcd_down &&
2106                     newsigs.cts_up   == oldsigs.cts_up   &&
2107                     newsigs.cts_down == oldsigs.cts_down &&
2108                     newsigs.ri_up    == oldsigs.ri_up    &&
2109                     newsigs.ri_down  == oldsigs.ri_down  &&
2110                     cnow.exithunt    == cprev.exithunt   &&
2111                     cnow.rxidle      == cprev.rxidle) {
2112                         rc = -EIO;
2113                         break;
2114                 }
2115
2116                 events = mask &
2117                         ( (newsigs.dsr_up   != oldsigs.dsr_up   ? MgslEvent_DsrActive:0)   +
2118                           (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
2119                           (newsigs.dcd_up   != oldsigs.dcd_up   ? MgslEvent_DcdActive:0)   +
2120                           (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
2121                           (newsigs.cts_up   != oldsigs.cts_up   ? MgslEvent_CtsActive:0)   +
2122                           (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
2123                           (newsigs.ri_up    != oldsigs.ri_up    ? MgslEvent_RiActive:0)    +
2124                           (newsigs.ri_down  != oldsigs.ri_down  ? MgslEvent_RiInactive:0)  +
2125                           (cnow.exithunt    != cprev.exithunt   ? MgslEvent_ExitHuntMode:0) +
2126                           (cnow.rxidle      != cprev.rxidle     ? MgslEvent_IdleReceived:0) );
2127                 if (events)
2128                         break;
2129                 
2130                 cprev = cnow;
2131                 oldsigs = newsigs;
2132         }
2133         
2134         remove_wait_queue(&info->event_wait_q, &wait);
2135         set_current_state(TASK_RUNNING);
2136
2137         if (mask & MgslEvent_ExitHuntMode) {
2138                 spin_lock_irqsave(&info->lock,flags);
2139                 if (!waitqueue_active(&info->event_wait_q))
2140                         irq_disable(info, CHA, IRQ_EXITHUNT);
2141                 spin_unlock_irqrestore(&info->lock,flags);
2142         }
2143 exit:
2144         if (rc == 0)
2145                 PUT_USER(rc, events, mask_ptr);
2146         return rc;
2147 }
2148
2149 static int modem_input_wait(MGSLPC_INFO *info,int arg)
2150 {
2151         unsigned long flags;
2152         int rc;
2153         struct mgsl_icount cprev, cnow;
2154         DECLARE_WAITQUEUE(wait, current);
2155
2156         /* save current irq counts */
2157         spin_lock_irqsave(&info->lock,flags);
2158         cprev = info->icount;
2159         add_wait_queue(&info->status_event_wait_q, &wait);
2160         set_current_state(TASK_INTERRUPTIBLE);
2161         spin_unlock_irqrestore(&info->lock,flags);
2162
2163         for(;;) {
2164                 schedule();
2165                 if (signal_pending(current)) {
2166                         rc = -ERESTARTSYS;
2167                         break;
2168                 }
2169
2170                 /* get new irq counts */
2171                 spin_lock_irqsave(&info->lock,flags);
2172                 cnow = info->icount;
2173                 set_current_state(TASK_INTERRUPTIBLE);
2174                 spin_unlock_irqrestore(&info->lock,flags);
2175
2176                 /* if no change, wait aborted for some reason */
2177                 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2178                     cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
2179                         rc = -EIO;
2180                         break;
2181                 }
2182
2183                 /* check for change in caller specified modem input */
2184                 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
2185                     (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
2186                     (arg & TIOCM_CD  && cnow.dcd != cprev.dcd) ||
2187                     (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
2188                         rc = 0;
2189                         break;
2190                 }
2191
2192                 cprev = cnow;
2193         }
2194         remove_wait_queue(&info->status_event_wait_q, &wait);
2195         set_current_state(TASK_RUNNING);
2196         return rc;
2197 }
2198
2199 /* return the state of the serial control and status signals
2200  */
2201 static int tiocmget(struct tty_struct *tty, struct file *file)
2202 {
2203         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
2204         unsigned int result;
2205         unsigned long flags;
2206
2207         spin_lock_irqsave(&info->lock,flags);
2208         get_signals(info);
2209         spin_unlock_irqrestore(&info->lock,flags);
2210
2211         result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
2212                 ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
2213                 ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
2214                 ((info->serial_signals & SerialSignal_RI)  ? TIOCM_RNG:0) +
2215                 ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
2216                 ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS:0);
2217
2218         if (debug_level >= DEBUG_LEVEL_INFO)
2219                 printk("%s(%d):%s tiocmget() value=%08X\n",
2220                          __FILE__,__LINE__, info->device_name, result );
2221         return result;
2222 }
2223
2224 /* set modem control signals (DTR/RTS)
2225  */
2226 static int tiocmset(struct tty_struct *tty, struct file *file,
2227                     unsigned int set, unsigned int clear)
2228 {
2229         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
2230         unsigned long flags;
2231
2232         if (debug_level >= DEBUG_LEVEL_INFO)
2233                 printk("%s(%d):%s tiocmset(%x,%x)\n",
2234                         __FILE__,__LINE__,info->device_name, set, clear);
2235
2236         if (set & TIOCM_RTS)
2237                 info->serial_signals |= SerialSignal_RTS;
2238         if (set & TIOCM_DTR)
2239                 info->serial_signals |= SerialSignal_DTR;
2240         if (clear & TIOCM_RTS)
2241                 info->serial_signals &= ~SerialSignal_RTS;
2242         if (clear & TIOCM_DTR)
2243                 info->serial_signals &= ~SerialSignal_DTR;
2244
2245         spin_lock_irqsave(&info->lock,flags);
2246         set_signals(info);
2247         spin_unlock_irqrestore(&info->lock,flags);
2248
2249         return 0;
2250 }
2251
2252 /* Set or clear transmit break condition
2253  *
2254  * Arguments:           tty             pointer to tty instance data
2255  *                      break_state     -1=set break condition, 0=clear
2256  */
2257 static void mgslpc_break(struct tty_struct *tty, int break_state)
2258 {
2259         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2260         unsigned long flags;
2261         
2262         if (debug_level >= DEBUG_LEVEL_INFO)
2263                 printk("%s(%d):mgslpc_break(%s,%d)\n",
2264                          __FILE__,__LINE__, info->device_name, break_state);
2265                          
2266         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_break"))
2267                 return;
2268
2269         spin_lock_irqsave(&info->lock,flags);
2270         if (break_state == -1)
2271                 set_reg_bits(info, CHA+DAFO, BIT6);
2272         else 
2273                 clear_reg_bits(info, CHA+DAFO, BIT6);
2274         spin_unlock_irqrestore(&info->lock,flags);
2275 }
2276
2277 /* Service an IOCTL request
2278  *      
2279  * Arguments:
2280  * 
2281  *      tty     pointer to tty instance data
2282  *      file    pointer to associated file object for device
2283  *      cmd     IOCTL command code
2284  *      arg     command argument/context
2285  *      
2286  * Return Value:        0 if success, otherwise error code
2287  */
2288 static int mgslpc_ioctl(struct tty_struct *tty, struct file * file,
2289                         unsigned int cmd, unsigned long arg)
2290 {
2291         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2292         
2293         if (debug_level >= DEBUG_LEVEL_INFO)
2294                 printk("%s(%d):mgslpc_ioctl %s cmd=%08X\n", __FILE__,__LINE__,
2295                         info->device_name, cmd );
2296         
2297         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_ioctl"))
2298                 return -ENODEV;
2299
2300         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
2301             (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
2302                 if (tty->flags & (1 << TTY_IO_ERROR))
2303                     return -EIO;
2304         }
2305
2306         return ioctl_common(info, cmd, arg);
2307 }
2308
2309 static int ioctl_common(MGSLPC_INFO *info, unsigned int cmd, unsigned long arg)
2310 {
2311         int error;
2312         struct mgsl_icount cnow;        /* kernel counter temps */
2313         struct serial_icounter_struct __user *p_cuser;  /* user space */
2314         void __user *argp = (void __user *)arg;
2315         unsigned long flags;
2316         
2317         switch (cmd) {
2318         case MGSL_IOCGPARAMS:
2319                 return get_params(info, argp);
2320         case MGSL_IOCSPARAMS:
2321                 return set_params(info, argp);
2322         case MGSL_IOCGTXIDLE:
2323                 return get_txidle(info, argp);
2324         case MGSL_IOCSTXIDLE:
2325                 return set_txidle(info, (int)arg);
2326         case MGSL_IOCGIF:
2327                 return get_interface(info, argp);
2328         case MGSL_IOCSIF:
2329                 return set_interface(info,(int)arg);
2330         case MGSL_IOCTXENABLE:
2331                 return set_txenable(info,(int)arg);
2332         case MGSL_IOCRXENABLE:
2333                 return set_rxenable(info,(int)arg);
2334         case MGSL_IOCTXABORT:
2335                 return tx_abort(info);
2336         case MGSL_IOCGSTATS:
2337                 return get_stats(info, argp);
2338         case MGSL_IOCWAITEVENT:
2339                 return wait_events(info, argp);
2340         case TIOCMIWAIT:
2341                 return modem_input_wait(info,(int)arg);
2342         case TIOCGICOUNT:
2343                 spin_lock_irqsave(&info->lock,flags);
2344                 cnow = info->icount;
2345                 spin_unlock_irqrestore(&info->lock,flags);
2346                 p_cuser = argp;
2347                 PUT_USER(error,cnow.cts, &p_cuser->cts);
2348                 if (error) return error;
2349                 PUT_USER(error,cnow.dsr, &p_cuser->dsr);
2350                 if (error) return error;
2351                 PUT_USER(error,cnow.rng, &p_cuser->rng);
2352                 if (error) return error;
2353                 PUT_USER(error,cnow.dcd, &p_cuser->dcd);
2354                 if (error) return error;
2355                 PUT_USER(error,cnow.rx, &p_cuser->rx);
2356                 if (error) return error;
2357                 PUT_USER(error,cnow.tx, &p_cuser->tx);
2358                 if (error) return error;
2359                 PUT_USER(error,cnow.frame, &p_cuser->frame);
2360                 if (error) return error;
2361                 PUT_USER(error,cnow.overrun, &p_cuser->overrun);
2362                 if (error) return error;
2363                 PUT_USER(error,cnow.parity, &p_cuser->parity);
2364                 if (error) return error;
2365                 PUT_USER(error,cnow.brk, &p_cuser->brk);
2366                 if (error) return error;
2367                 PUT_USER(error,cnow.buf_overrun, &p_cuser->buf_overrun);
2368                 if (error) return error;
2369                 return 0;
2370         default:
2371                 return -ENOIOCTLCMD;
2372         }
2373         return 0;
2374 }
2375
2376 /* Set new termios settings
2377  *      
2378  * Arguments:
2379  * 
2380  *      tty             pointer to tty structure
2381  *      termios         pointer to buffer to hold returned old termios
2382  */
2383 static void mgslpc_set_termios(struct tty_struct *tty, struct termios *old_termios)
2384 {
2385         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
2386         unsigned long flags;
2387         
2388         if (debug_level >= DEBUG_LEVEL_INFO)
2389                 printk("%s(%d):mgslpc_set_termios %s\n", __FILE__,__LINE__,
2390                         tty->driver->name );
2391         
2392         /* just return if nothing has changed */
2393         if ((tty->termios->c_cflag == old_termios->c_cflag)
2394             && (RELEVANT_IFLAG(tty->termios->c_iflag) 
2395                 == RELEVANT_IFLAG(old_termios->c_iflag)))
2396           return;
2397
2398         mgslpc_change_params(info);
2399
2400         /* Handle transition to B0 status */
2401         if (old_termios->c_cflag & CBAUD &&
2402             !(tty->termios->c_cflag & CBAUD)) {
2403                 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
2404                 spin_lock_irqsave(&info->lock,flags);
2405                 set_signals(info);
2406                 spin_unlock_irqrestore(&info->lock,flags);
2407         }
2408         
2409         /* Handle transition away from B0 status */
2410         if (!(old_termios->c_cflag & CBAUD) &&
2411             tty->termios->c_cflag & CBAUD) {
2412                 info->serial_signals |= SerialSignal_DTR;
2413                 if (!(tty->termios->c_cflag & CRTSCTS) || 
2414                     !test_bit(TTY_THROTTLED, &tty->flags)) {
2415                         info->serial_signals |= SerialSignal_RTS;
2416                 }
2417                 spin_lock_irqsave(&info->lock,flags);
2418                 set_signals(info);
2419                 spin_unlock_irqrestore(&info->lock,flags);
2420         }
2421         
2422         /* Handle turning off CRTSCTS */
2423         if (old_termios->c_cflag & CRTSCTS &&
2424             !(tty->termios->c_cflag & CRTSCTS)) {
2425                 tty->hw_stopped = 0;
2426                 tx_release(tty);
2427         }
2428 }
2429
2430 static void mgslpc_close(struct tty_struct *tty, struct file * filp)
2431 {
2432         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2433
2434         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_close"))
2435                 return;
2436         
2437         if (debug_level >= DEBUG_LEVEL_INFO)
2438                 printk("%s(%d):mgslpc_close(%s) entry, count=%d\n",
2439                          __FILE__,__LINE__, info->device_name, info->count);
2440                          
2441         if (!info->count)
2442                 return;
2443
2444         if (tty_hung_up_p(filp))
2445                 goto cleanup;
2446                         
2447         if ((tty->count == 1) && (info->count != 1)) {
2448                 /*
2449                  * tty->count is 1 and the tty structure will be freed.
2450                  * info->count should be one in this case.
2451                  * if it's not, correct it so that the port is shutdown.
2452                  */
2453                 printk("mgslpc_close: bad refcount; tty->count is 1, "
2454                        "info->count is %d\n", info->count);
2455                 info->count = 1;
2456         }
2457         
2458         info->count--;
2459         
2460         /* if at least one open remaining, leave hardware active */
2461         if (info->count)
2462                 goto cleanup;
2463         
2464         info->flags |= ASYNC_CLOSING;
2465         
2466         /* set tty->closing to notify line discipline to 
2467          * only process XON/XOFF characters. Only the N_TTY
2468          * discipline appears to use this (ppp does not).
2469          */
2470         tty->closing = 1;
2471         
2472         /* wait for transmit data to clear all layers */
2473         
2474         if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE) {
2475                 if (debug_level >= DEBUG_LEVEL_INFO)
2476                         printk("%s(%d):mgslpc_close(%s) calling tty_wait_until_sent\n",
2477                                  __FILE__,__LINE__, info->device_name );
2478                 tty_wait_until_sent(tty, info->closing_wait);
2479         }
2480                 
2481         if (info->flags & ASYNC_INITIALIZED)
2482                 mgslpc_wait_until_sent(tty, info->timeout);
2483
2484         if (tty->driver->flush_buffer)
2485                 tty->driver->flush_buffer(tty);
2486
2487         ldisc_flush_buffer(tty);
2488                 
2489         shutdown(info);
2490         
2491         tty->closing = 0;
2492         info->tty = NULL;
2493         
2494         if (info->blocked_open) {
2495                 if (info->close_delay) {
2496                         msleep_interruptible(jiffies_to_msecs(info->close_delay));
2497                 }
2498                 wake_up_interruptible(&info->open_wait);
2499         }
2500         
2501         info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
2502                          
2503         wake_up_interruptible(&info->close_wait);
2504         
2505 cleanup:                        
2506         if (debug_level >= DEBUG_LEVEL_INFO)
2507                 printk("%s(%d):mgslpc_close(%s) exit, count=%d\n", __FILE__,__LINE__,
2508                         tty->driver->name, info->count);
2509 }
2510
2511 /* Wait until the transmitter is empty.
2512  */
2513 static void mgslpc_wait_until_sent(struct tty_struct *tty, int timeout)
2514 {
2515         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2516         unsigned long orig_jiffies, char_time;
2517
2518         if (!info )
2519                 return;
2520
2521         if (debug_level >= DEBUG_LEVEL_INFO)
2522                 printk("%s(%d):mgslpc_wait_until_sent(%s) entry\n",
2523                          __FILE__,__LINE__, info->device_name );
2524       
2525         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_wait_until_sent"))
2526                 return;
2527
2528         if (!(info->flags & ASYNC_INITIALIZED))
2529                 goto exit;
2530          
2531         orig_jiffies = jiffies;
2532       
2533         /* Set check interval to 1/5 of estimated time to
2534          * send a character, and make it at least 1. The check
2535          * interval should also be less than the timeout.
2536          * Note: use tight timings here to satisfy the NIST-PCTS.
2537          */ 
2538        
2539         if ( info->params.data_rate ) {
2540                 char_time = info->timeout/(32 * 5);
2541                 if (!char_time)
2542                         char_time++;
2543         } else
2544                 char_time = 1;
2545                 
2546         if (timeout)
2547                 char_time = min_t(unsigned long, char_time, timeout);
2548                 
2549         if (info->params.mode == MGSL_MODE_HDLC) {
2550                 while (info->tx_active) {
2551                         msleep_interruptible(jiffies_to_msecs(char_time));
2552                         if (signal_pending(current))
2553                                 break;
2554                         if (timeout && time_after(jiffies, orig_jiffies + timeout))
2555                                 break;
2556                 }
2557         } else {
2558                 while ((info->tx_count || info->tx_active) &&
2559                         info->tx_enabled) {
2560                         msleep_interruptible(jiffies_to_msecs(char_time));
2561                         if (signal_pending(current))
2562                                 break;
2563                         if (timeout && time_after(jiffies, orig_jiffies + timeout))
2564                                 break;
2565                 }
2566         }
2567       
2568 exit:
2569         if (debug_level >= DEBUG_LEVEL_INFO)
2570                 printk("%s(%d):mgslpc_wait_until_sent(%s) exit\n",
2571                          __FILE__,__LINE__, info->device_name );
2572 }
2573
2574 /* Called by tty_hangup() when a hangup is signaled.
2575  * This is the same as closing all open files for the port.
2576  */
2577 static void mgslpc_hangup(struct tty_struct *tty)
2578 {
2579         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2580         
2581         if (debug_level >= DEBUG_LEVEL_INFO)
2582                 printk("%s(%d):mgslpc_hangup(%s)\n",
2583                          __FILE__,__LINE__, info->device_name );
2584                          
2585         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_hangup"))
2586                 return;
2587
2588         mgslpc_flush_buffer(tty);
2589         shutdown(info);
2590         
2591         info->count = 0;        
2592         info->flags &= ~ASYNC_NORMAL_ACTIVE;
2593         info->tty = NULL;
2594
2595         wake_up_interruptible(&info->open_wait);
2596 }
2597
2598 /* Block the current process until the specified port
2599  * is ready to be opened.
2600  */
2601 static int block_til_ready(struct tty_struct *tty, struct file *filp,
2602                            MGSLPC_INFO *info)
2603 {
2604         DECLARE_WAITQUEUE(wait, current);
2605         int             retval;
2606         int             do_clocal = 0, extra_count = 0;
2607         unsigned long   flags;
2608         
2609         if (debug_level >= DEBUG_LEVEL_INFO)
2610                 printk("%s(%d):block_til_ready on %s\n",
2611                          __FILE__,__LINE__, tty->driver->name );
2612
2613         if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
2614                 /* nonblock mode is set or port is not enabled */
2615                 /* just verify that callout device is not active */
2616                 info->flags |= ASYNC_NORMAL_ACTIVE;
2617                 return 0;
2618         }
2619
2620         if (tty->termios->c_cflag & CLOCAL)
2621                 do_clocal = 1;
2622
2623         /* Wait for carrier detect and the line to become
2624          * free (i.e., not in use by the callout).  While we are in
2625          * this loop, info->count is dropped by one, so that
2626          * mgslpc_close() knows when to free things.  We restore it upon
2627          * exit, either normal or abnormal.
2628          */
2629          
2630         retval = 0;
2631         add_wait_queue(&info->open_wait, &wait);
2632         
2633         if (debug_level >= DEBUG_LEVEL_INFO)
2634                 printk("%s(%d):block_til_ready before block on %s count=%d\n",
2635                          __FILE__,__LINE__, tty->driver->name, info->count );
2636
2637         spin_lock_irqsave(&info->lock, flags);
2638         if (!tty_hung_up_p(filp)) {
2639                 extra_count = 1;
2640                 info->count--;
2641         }
2642         spin_unlock_irqrestore(&info->lock, flags);
2643         info->blocked_open++;
2644         
2645         while (1) {
2646                 if ((tty->termios->c_cflag & CBAUD)) {
2647                         spin_lock_irqsave(&info->lock,flags);
2648                         info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
2649                         set_signals(info);
2650                         spin_unlock_irqrestore(&info->lock,flags);
2651                 }
2652                 
2653                 set_current_state(TASK_INTERRUPTIBLE);
2654                 
2655                 if (tty_hung_up_p(filp) || !(info->flags & ASYNC_INITIALIZED)){
2656                         retval = (info->flags & ASYNC_HUP_NOTIFY) ?
2657                                         -EAGAIN : -ERESTARTSYS;
2658                         break;
2659                 }
2660                 
2661                 spin_lock_irqsave(&info->lock,flags);
2662                 get_signals(info);
2663                 spin_unlock_irqrestore(&info->lock,flags);
2664                 
2665                 if (!(info->flags & ASYNC_CLOSING) &&
2666                     (do_clocal || (info->serial_signals & SerialSignal_DCD)) ) {
2667                         break;
2668                 }
2669                         
2670                 if (signal_pending(current)) {
2671                         retval = -ERESTARTSYS;
2672                         break;
2673                 }
2674                 
2675                 if (debug_level >= DEBUG_LEVEL_INFO)
2676                         printk("%s(%d):block_til_ready blocking on %s count=%d\n",
2677                                  __FILE__,__LINE__, tty->driver->name, info->count );
2678                                  
2679                 schedule();
2680         }
2681         
2682         set_current_state(TASK_RUNNING);
2683         remove_wait_queue(&info->open_wait, &wait);
2684         
2685         if (extra_count)
2686                 info->count++;
2687         info->blocked_open--;
2688         
2689         if (debug_level >= DEBUG_LEVEL_INFO)
2690                 printk("%s(%d):block_til_ready after blocking on %s count=%d\n",
2691                          __FILE__,__LINE__, tty->driver->name, info->count );
2692                          
2693         if (!retval)
2694                 info->flags |= ASYNC_NORMAL_ACTIVE;
2695                 
2696         return retval;
2697 }
2698
2699 static int mgslpc_open(struct tty_struct *tty, struct file * filp)
2700 {
2701         MGSLPC_INFO     *info;
2702         int                     retval, line;
2703         unsigned long flags;
2704
2705         /* verify range of specified line number */     
2706         line = tty->index;
2707         if ((line < 0) || (line >= mgslpc_device_count)) {
2708                 printk("%s(%d):mgslpc_open with invalid line #%d.\n",
2709                         __FILE__,__LINE__,line);
2710                 return -ENODEV;
2711         }
2712
2713         /* find the info structure for the specified line */
2714         info = mgslpc_device_list;
2715         while(info && info->line != line)
2716                 info = info->next_device;
2717         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_open"))
2718                 return -ENODEV;
2719         
2720         tty->driver_data = info;
2721         info->tty = tty;
2722                 
2723         if (debug_level >= DEBUG_LEVEL_INFO)
2724                 printk("%s(%d):mgslpc_open(%s), old ref count = %d\n",
2725                          __FILE__,__LINE__,tty->driver->name, info->count);
2726
2727         /* If port is closing, signal caller to try again */
2728         if (tty_hung_up_p(filp) || info->flags & ASYNC_CLOSING){
2729                 if (info->flags & ASYNC_CLOSING)
2730                         interruptible_sleep_on(&info->close_wait);
2731                 retval = ((info->flags & ASYNC_HUP_NOTIFY) ?
2732                         -EAGAIN : -ERESTARTSYS);
2733                 goto cleanup;
2734         }
2735         
2736         info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
2737
2738         spin_lock_irqsave(&info->netlock, flags);
2739         if (info->netcount) {
2740                 retval = -EBUSY;
2741                 spin_unlock_irqrestore(&info->netlock, flags);
2742                 goto cleanup;
2743         }
2744         info->count++;
2745         spin_unlock_irqrestore(&info->netlock, flags);
2746
2747         if (info->count == 1) {
2748                 /* 1st open on this device, init hardware */
2749                 retval = startup(info);
2750                 if (retval < 0)
2751                         goto cleanup;
2752         }
2753
2754         retval = block_til_ready(tty, filp, info);
2755         if (retval) {
2756                 if (debug_level >= DEBUG_LEVEL_INFO)
2757                         printk("%s(%d):block_til_ready(%s) returned %d\n",
2758                                  __FILE__,__LINE__, info->device_name, retval);
2759                 goto cleanup;
2760         }
2761
2762         if (debug_level >= DEBUG_LEVEL_INFO)
2763                 printk("%s(%d):mgslpc_open(%s) success\n",
2764                          __FILE__,__LINE__, info->device_name);
2765         retval = 0;
2766         
2767 cleanup:                        
2768         if (retval) {
2769                 if (tty->count == 1)
2770                         info->tty = NULL; /* tty layer will release tty struct */
2771                 if(info->count)
2772                         info->count--;
2773         }
2774         
2775         return retval;
2776 }
2777
2778 /*
2779  * /proc fs routines....
2780  */
2781
2782 static inline int line_info(char *buf, MGSLPC_INFO *info)
2783 {
2784         char    stat_buf[30];
2785         int     ret;
2786         unsigned long flags;
2787
2788         ret = sprintf(buf, "%s:io:%04X irq:%d",
2789                       info->device_name, info->io_base, info->irq_level);
2790
2791         /* output current serial signal states */
2792         spin_lock_irqsave(&info->lock,flags);
2793         get_signals(info);
2794         spin_unlock_irqrestore(&info->lock,flags);
2795         
2796         stat_buf[0] = 0;
2797         stat_buf[1] = 0;
2798         if (info->serial_signals & SerialSignal_RTS)
2799                 strcat(stat_buf, "|RTS");
2800         if (info->serial_signals & SerialSignal_CTS)
2801                 strcat(stat_buf, "|CTS");
2802         if (info->serial_signals & SerialSignal_DTR)
2803                 strcat(stat_buf, "|DTR");
2804         if (info->serial_signals & SerialSignal_DSR)
2805                 strcat(stat_buf, "|DSR");
2806         if (info->serial_signals & SerialSignal_DCD)
2807                 strcat(stat_buf, "|CD");
2808         if (info->serial_signals & SerialSignal_RI)
2809                 strcat(stat_buf, "|RI");
2810
2811         if (info->params.mode == MGSL_MODE_HDLC) {
2812                 ret += sprintf(buf+ret, " HDLC txok:%d rxok:%d",
2813                               info->icount.txok, info->icount.rxok);
2814                 if (info->icount.txunder)
2815                         ret += sprintf(buf+ret, " txunder:%d", info->icount.txunder);
2816                 if (info->icount.txabort)
2817                         ret += sprintf(buf+ret, " txabort:%d", info->icount.txabort);
2818                 if (info->icount.rxshort)
2819                         ret += sprintf(buf+ret, " rxshort:%d", info->icount.rxshort);   
2820                 if (info->icount.rxlong)
2821                         ret += sprintf(buf+ret, " rxlong:%d", info->icount.rxlong);
2822                 if (info->icount.rxover)
2823                         ret += sprintf(buf+ret, " rxover:%d", info->icount.rxover);
2824                 if (info->icount.rxcrc)
2825                         ret += sprintf(buf+ret, " rxcrc:%d", info->icount.rxcrc);
2826         } else {
2827                 ret += sprintf(buf+ret, " ASYNC tx:%d rx:%d",
2828                               info->icount.tx, info->icount.rx);
2829                 if (info->icount.frame)
2830                         ret += sprintf(buf+ret, " fe:%d", info->icount.frame);
2831                 if (info->icount.parity)
2832                         ret += sprintf(buf+ret, " pe:%d", info->icount.parity);
2833                 if (info->icount.brk)
2834                         ret += sprintf(buf+ret, " brk:%d", info->icount.brk);   
2835                 if (info->icount.overrun)
2836                         ret += sprintf(buf+ret, " oe:%d", info->icount.overrun);
2837         }
2838         
2839         /* Append serial signal status to end */
2840         ret += sprintf(buf+ret, " %s\n", stat_buf+1);
2841         
2842         ret += sprintf(buf+ret, "txactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
2843                        info->tx_active,info->bh_requested,info->bh_running,
2844                        info->pending_bh);
2845         
2846         return ret;
2847 }
2848
2849 /* Called to print information about devices
2850  */
2851 static int mgslpc_read_proc(char *page, char **start, off_t off, int count,
2852                  int *eof, void *data)
2853 {
2854         int len = 0, l;
2855         off_t   begin = 0;
2856         MGSLPC_INFO *info;
2857         
2858         len += sprintf(page, "synclink driver:%s\n", driver_version);
2859         
2860         info = mgslpc_device_list;
2861         while( info ) {
2862                 l = line_info(page + len, info);
2863                 len += l;
2864                 if (len+begin > off+count)
2865                         goto done;
2866                 if (len+begin < off) {
2867                         begin += len;
2868                         len = 0;
2869                 }
2870                 info = info->next_device;
2871         }
2872
2873         *eof = 1;
2874 done:
2875         if (off >= len+begin)
2876                 return 0;
2877         *start = page + (off-begin);
2878         return ((count < begin+len-off) ? count : begin+len-off);
2879 }
2880
2881 static int rx_alloc_buffers(MGSLPC_INFO *info)
2882 {
2883         /* each buffer has header and data */
2884         info->rx_buf_size = sizeof(RXBUF) + info->max_frame_size;
2885
2886         /* calculate total allocation size for 8 buffers */
2887         info->rx_buf_total_size = info->rx_buf_size * 8;
2888
2889         /* limit total allocated memory */
2890         if (info->rx_buf_total_size > 0x10000)
2891                 info->rx_buf_total_size = 0x10000;
2892
2893         /* calculate number of buffers */
2894         info->rx_buf_count = info->rx_buf_total_size / info->rx_buf_size;
2895
2896         info->rx_buf = kmalloc(info->rx_buf_total_size, GFP_KERNEL);
2897         if (info->rx_buf == NULL)
2898                 return -ENOMEM;
2899
2900         rx_reset_buffers(info);
2901         return 0;
2902 }
2903
2904 static void rx_free_buffers(MGSLPC_INFO *info)
2905 {
2906         kfree(info->rx_buf);
2907         info->rx_buf = NULL;
2908 }
2909
2910 static int claim_resources(MGSLPC_INFO *info)
2911 {
2912         if (rx_alloc_buffers(info) < 0 ) {
2913                 printk( "Cant allocate rx buffer %s\n", info->device_name);
2914                 release_resources(info);
2915                 return -ENODEV;
2916         }       
2917         return 0;
2918 }
2919
2920 static void release_resources(MGSLPC_INFO *info)
2921 {
2922         if (debug_level >= DEBUG_LEVEL_INFO)
2923                 printk("release_resources(%s)\n", info->device_name);
2924         rx_free_buffers(info);
2925 }
2926
2927 /* Add the specified device instance data structure to the
2928  * global linked list of devices and increment the device count.
2929  *      
2930  * Arguments:           info    pointer to device instance data
2931  */
2932 static void mgslpc_add_device(MGSLPC_INFO *info)
2933 {
2934         info->next_device = NULL;
2935         info->line = mgslpc_device_count;
2936         sprintf(info->device_name,"ttySLP%d",info->line);
2937         
2938         if (info->line < MAX_DEVICE_COUNT) {
2939                 if (maxframe[info->line])
2940                         info->max_frame_size = maxframe[info->line];
2941                 info->dosyncppp = dosyncppp[info->line];
2942         }
2943
2944         mgslpc_device_count++;
2945         
2946         if (!mgslpc_device_list)
2947                 mgslpc_device_list = info;
2948         else {  
2949                 MGSLPC_INFO *current_dev = mgslpc_device_list;
2950                 while( current_dev->next_device )
2951                         current_dev = current_dev->next_device;
2952                 current_dev->next_device = info;
2953         }
2954         
2955         if (info->max_frame_size < 4096)
2956                 info->max_frame_size = 4096;
2957         else if (info->max_frame_size > 65535)
2958                 info->max_frame_size = 65535;
2959         
2960         printk( "SyncLink PC Card %s:IO=%04X IRQ=%d\n",
2961                 info->device_name, info->io_base, info->irq_level);
2962
2963 #ifdef CONFIG_HDLC
2964         hdlcdev_init(info);
2965 #endif
2966 }
2967
2968 static void mgslpc_remove_device(MGSLPC_INFO *remove_info)
2969 {
2970         MGSLPC_INFO *info = mgslpc_device_list;
2971         MGSLPC_INFO *last = NULL;
2972
2973         while(info) {
2974                 if (info == remove_info) {
2975                         if (last)
2976                                 last->next_device = info->next_device;
2977                         else
2978                                 mgslpc_device_list = info->next_device;
2979 #ifdef CONFIG_HDLC
2980                         hdlcdev_exit(info);
2981 #endif
2982                         release_resources(info);
2983                         kfree(info);
2984                         mgslpc_device_count--;
2985                         return;
2986                 }
2987                 last = info;
2988                 info = info->next_device;
2989         }
2990 }
2991
2992 static struct pcmcia_device_id mgslpc_ids[] = {
2993         PCMCIA_DEVICE_MANF_CARD(0x02c5, 0x0050),
2994         PCMCIA_DEVICE_NULL
2995 };
2996 MODULE_DEVICE_TABLE(pcmcia, mgslpc_ids);
2997
2998 static struct pcmcia_driver mgslpc_driver = {
2999         .owner          = THIS_MODULE,
3000         .drv            = {
3001                 .name   = "synclink_cs",
3002         },
3003         .probe          = mgslpc_probe,
3004         .remove         = mgslpc_detach,
3005         .id_table       = mgslpc_ids,
3006         .suspend        = mgslpc_suspend,
3007         .resume         = mgslpc_resume,
3008 };
3009
3010 static const struct tty_operations mgslpc_ops = {
3011         .open = mgslpc_open,
3012         .close = mgslpc_close,
3013         .write = mgslpc_write,
3014         .put_char = mgslpc_put_char,
3015         .flush_chars = mgslpc_flush_chars,
3016         .write_room = mgslpc_write_room,
3017         .chars_in_buffer = mgslpc_chars_in_buffer,
3018         .flush_buffer = mgslpc_flush_buffer,
3019         .ioctl = mgslpc_ioctl,
3020         .throttle = mgslpc_throttle,
3021         .unthrottle = mgslpc_unthrottle,
3022         .send_xchar = mgslpc_send_xchar,
3023         .break_ctl = mgslpc_break,
3024         .wait_until_sent = mgslpc_wait_until_sent,
3025         .read_proc = mgslpc_read_proc,
3026         .set_termios = mgslpc_set_termios,
3027         .stop = tx_pause,
3028         .start = tx_release,
3029         .hangup = mgslpc_hangup,
3030         .tiocmget = tiocmget,
3031         .tiocmset = tiocmset,
3032 };
3033
3034 static void synclink_cs_cleanup(void)
3035 {
3036         int rc;
3037
3038         printk("Unloading %s: version %s\n", driver_name, driver_version);
3039
3040         while(mgslpc_device_list)
3041                 mgslpc_remove_device(mgslpc_device_list);
3042
3043         if (serial_driver) {
3044                 if ((rc = tty_unregister_driver(serial_driver)))
3045                         printk("%s(%d) failed to unregister tty driver err=%d\n",
3046                                __FILE__,__LINE__,rc);
3047                 put_tty_driver(serial_driver);
3048         }
3049
3050         pcmcia_unregister_driver(&mgslpc_driver);
3051 }
3052
3053 static int __init synclink_cs_init(void)
3054 {
3055     int rc;
3056
3057     if (break_on_load) {
3058             mgslpc_get_text_ptr();
3059             BREAKPOINT();
3060     }
3061
3062     printk("%s %s\n", driver_name, driver_version);
3063
3064     if ((rc = pcmcia_register_driver(&mgslpc_driver)) < 0)
3065             return rc;
3066
3067     serial_driver = alloc_tty_driver(MAX_DEVICE_COUNT);
3068     if (!serial_driver) {
3069             rc = -ENOMEM;
3070             goto error;
3071     }
3072
3073     /* Initialize the tty_driver structure */
3074         
3075     serial_driver->owner = THIS_MODULE;
3076     serial_driver->driver_name = "synclink_cs";
3077     serial_driver->name = "ttySLP";
3078     serial_driver->major = ttymajor;
3079     serial_driver->minor_start = 64;
3080     serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
3081     serial_driver->subtype = SERIAL_TYPE_NORMAL;
3082     serial_driver->init_termios = tty_std_termios;
3083     serial_driver->init_termios.c_cflag =
3084             B9600 | CS8 | CREAD | HUPCL | CLOCAL;
3085     serial_driver->flags = TTY_DRIVER_REAL_RAW;
3086     tty_set_operations(serial_driver, &mgslpc_ops);
3087
3088     if ((rc = tty_register_driver(serial_driver)) < 0) {
3089             printk("%s(%d):Couldn't register serial driver\n",
3090                    __FILE__,__LINE__);
3091             put_tty_driver(serial_driver);
3092             serial_driver = NULL;
3093             goto error;
3094     }
3095                         
3096     printk("%s %s, tty major#%d\n",
3097            driver_name, driver_version,
3098            serial_driver->major);
3099         
3100     return 0;
3101
3102 error:
3103     synclink_cs_cleanup();
3104     return rc;
3105 }
3106
3107 static void __exit synclink_cs_exit(void) 
3108 {
3109         synclink_cs_cleanup();
3110 }
3111
3112 module_init(synclink_cs_init);
3113 module_exit(synclink_cs_exit);
3114
3115 static void mgslpc_set_rate(MGSLPC_INFO *info, unsigned char channel, unsigned int rate)
3116 {
3117         unsigned int M, N;
3118         unsigned char val;
3119
3120         /* note:standard BRG mode is broken in V3.2 chip 
3121          * so enhanced mode is always used 
3122          */
3123
3124         if (rate) {
3125                 N = 3686400 / rate;
3126                 if (!N)
3127                         N = 1;
3128                 N >>= 1;
3129                 for (M = 1; N > 64 && M < 16; M++)
3130                         N >>= 1;
3131                 N--;
3132
3133                 /* BGR[5..0] = N
3134                  * BGR[9..6] = M
3135                  * BGR[7..0] contained in BGR register
3136                  * BGR[9..8] contained in CCR2[7..6]
3137                  * divisor = (N+1)*2^M
3138                  *
3139                  * Note: M *must* not be zero (causes asymetric duty cycle)
3140                  */ 
3141                 write_reg(info, (unsigned char) (channel + BGR),
3142                                   (unsigned char) ((M << 6) + N));
3143                 val = read_reg(info, (unsigned char) (channel + CCR2)) & 0x3f;
3144                 val |= ((M << 4) & 0xc0);
3145                 write_reg(info, (unsigned char) (channel + CCR2), val);
3146         }
3147 }
3148
3149 /* Enabled the AUX clock output at the specified frequency.
3150  */
3151 static void enable_auxclk(MGSLPC_INFO *info)
3152 {
3153         unsigned char val;
3154         
3155         /* MODE
3156          *
3157          * 07..06  MDS[1..0] 10 = transparent HDLC mode
3158          * 05      ADM Address Mode, 0 = no addr recognition
3159          * 04      TMD Timer Mode, 0 = external
3160          * 03      RAC Receiver Active, 0 = inactive
3161          * 02      RTS 0=RTS active during xmit, 1=RTS always active
3162          * 01      TRS Timer Resolution, 1=512
3163          * 00      TLP Test Loop, 0 = no loop
3164          *
3165          * 1000 0010
3166          */ 
3167         val = 0x82;
3168         
3169         /* channel B RTS is used to enable AUXCLK driver on SP505 */ 
3170         if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
3171                 val |= BIT2;
3172         write_reg(info, CHB + MODE, val);
3173         
3174         /* CCR0
3175          *
3176          * 07      PU Power Up, 1=active, 0=power down
3177          * 06      MCE Master Clock Enable, 1=enabled
3178          * 05      Reserved, 0
3179          * 04..02  SC[2..0] Encoding
3180          * 01..00  SM[1..0] Serial Mode, 00=HDLC
3181          *
3182          * 11000000
3183          */ 
3184         write_reg(info, CHB + CCR0, 0xc0);
3185         
3186         /* CCR1
3187          *
3188          * 07      SFLG Shared Flag, 0 = disable shared flags
3189          * 06      GALP Go Active On Loop, 0 = not used
3190          * 05      GLP Go On Loop, 0 = not used
3191          * 04      ODS Output Driver Select, 1=TxD is push-pull output
3192          * 03      ITF Interframe Time Fill, 0=mark, 1=flag
3193          * 02..00  CM[2..0] Clock Mode
3194          *
3195          * 0001 0111
3196          */ 
3197         write_reg(info, CHB + CCR1, 0x17);
3198         
3199         /* CCR2 (Channel B)
3200          *
3201          * 07..06  BGR[9..8] Baud rate bits 9..8
3202          * 05      BDF Baud rate divisor factor, 0=1, 1=BGR value
3203          * 04      SSEL Clock source select, 1=submode b
3204          * 03      TOE 0=TxCLK is input, 1=TxCLK is output
3205          * 02      RWX Read/Write Exchange 0=disabled
3206          * 01      C32, CRC select, 0=CRC-16, 1=CRC-32
3207          * 00      DIV, data inversion 0=disabled, 1=enabled
3208          *
3209          * 0011 1000
3210          */ 
3211         if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
3212                 write_reg(info, CHB + CCR2, 0x38);
3213         else
3214                 write_reg(info, CHB + CCR2, 0x30);
3215         
3216         /* CCR4
3217          *
3218          * 07      MCK4 Master Clock Divide by 4, 1=enabled
3219          * 06      EBRG Enhanced Baud Rate Generator Mode, 1=enabled
3220          * 05      TST1 Test Pin, 0=normal operation
3221          * 04      ICD Ivert Carrier Detect, 1=enabled (active low)
3222          * 03..02  Reserved, must be 0
3223          * 01..00  RFT[1..0] RxFIFO Threshold 00=32 bytes
3224          *
3225          * 0101 0000
3226          */ 
3227         write_reg(info, CHB + CCR4, 0x50);
3228         
3229         /* if auxclk not enabled, set internal BRG so
3230          * CTS transitions can be detected (requires TxC)
3231          */ 
3232         if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
3233                 mgslpc_set_rate(info, CHB, info->params.clock_speed);
3234         else
3235                 mgslpc_set_rate(info, CHB, 921600);
3236 }
3237
3238 static void loopback_enable(MGSLPC_INFO *info) 
3239 {
3240         unsigned char val;
3241         
3242         /* CCR1:02..00  CM[2..0] Clock Mode = 111 (clock mode 7) */ 
3243         val = read_reg(info, CHA + CCR1) | (BIT2 + BIT1 + BIT0);
3244         write_reg(info, CHA + CCR1, val);
3245         
3246         /* CCR2:04 SSEL Clock source select, 1=submode b */ 
3247         val = read_reg(info, CHA + CCR2) | (BIT4 + BIT5);
3248         write_reg(info, CHA + CCR2, val);
3249         
3250         /* set LinkSpeed if available, otherwise default to 2Mbps */ 
3251         if (info->params.clock_speed)
3252                 mgslpc_set_rate(info, CHA, info->params.clock_speed);
3253         else
3254                 mgslpc_set_rate(info, CHA, 1843200);
3255         
3256         /* MODE:00 TLP Test Loop, 1=loopback enabled */ 
3257         val = read_reg(info, CHA + MODE) | BIT0;
3258         write_reg(info, CHA + MODE, val);
3259 }
3260
3261 static void hdlc_mode(MGSLPC_INFO *info)
3262 {
3263         unsigned char val;
3264         unsigned char clkmode, clksubmode;
3265
3266         /* disable all interrupts */ 
3267         irq_disable(info, CHA, 0xffff);
3268         irq_disable(info, CHB, 0xffff);
3269         port_irq_disable(info, 0xff);
3270         
3271         /* assume clock mode 0a, rcv=RxC xmt=TxC */ 
3272         clkmode = clksubmode = 0;
3273         if (info->params.flags & HDLC_FLAG_RXC_DPLL
3274             && info->params.flags & HDLC_FLAG_TXC_DPLL) {
3275                 /* clock mode 7a, rcv = DPLL, xmt = DPLL */ 
3276                 clkmode = 7;
3277         } else if (info->params.flags & HDLC_FLAG_RXC_BRG
3278                  && info->params.flags & HDLC_FLAG_TXC_BRG) {
3279                 /* clock mode 7b, rcv = BRG, xmt = BRG */ 
3280                 clkmode = 7;
3281                 clksubmode = 1;
3282         } else if (info->params.flags & HDLC_FLAG_RXC_DPLL) {
3283                 if (info->params.flags & HDLC_FLAG_TXC_BRG) {
3284                         /* clock mode 6b, rcv = DPLL, xmt = BRG/16 */ 
3285                         clkmode = 6;
3286                         clksubmode = 1;
3287                 } else {
3288                         /* clock mode 6a, rcv = DPLL, xmt = TxC */ 
3289                         clkmode = 6;
3290                 }
3291         } else if (info->params.flags & HDLC_FLAG_TXC_BRG) {
3292                 /* clock mode 0b, rcv = RxC, xmt = BRG */ 
3293                 clksubmode = 1;
3294         }
3295         
3296         /* MODE
3297          *
3298          * 07..06  MDS[1..0] 10 = transparent HDLC mode
3299          * 05      ADM Address Mode, 0 = no addr recognition
3300          * 04      TMD Timer Mode, 0 = external
3301          * 03      RAC Receiver Active, 0 = inactive
3302          * 02      RTS 0=RTS active during xmit, 1=RTS always active
3303          * 01      TRS Timer Resolution, 1=512
3304          * 00      TLP Test Loop, 0 = no loop
3305          *
3306          * 1000 0010
3307          */ 
3308         val = 0x82;
3309         if (info->params.loopback)
3310                 val |= BIT0;
3311         
3312         /* preserve RTS state */ 
3313         if (info->serial_signals & SerialSignal_RTS)
3314                 val |= BIT2;
3315         write_reg(info, CHA + MODE, val);
3316         
3317         /* CCR0
3318          *
3319          * 07      PU Power Up, 1=active, 0=power down
3320          * 06      MCE Master Clock Enable, 1=enabled
3321          * 05      Reserved, 0
3322          * 04..02  SC[2..0] Encoding
3323          * 01..00  SM[1..0] Serial Mode, 00=HDLC
3324          *
3325          * 11000000
3326          */ 
3327         val = 0xc0;
3328         switch (info->params.encoding)
3329         {
3330         case HDLC_ENCODING_NRZI:
3331                 val |= BIT3;
3332                 break;
3333         case HDLC_ENCODING_BIPHASE_SPACE:
3334                 val |= BIT4;
3335                 break;          // FM0
3336         case HDLC_ENCODING_BIPHASE_MARK:
3337                 val |= BIT4 + BIT2;
3338                 break;          // FM1
3339         case HDLC_ENCODING_BIPHASE_LEVEL:
3340                 val |= BIT4 + BIT3;
3341                 break;          // Manchester
3342         }
3343         write_reg(info, CHA + CCR0, val);
3344         
3345         /* CCR1
3346          *
3347          * 07      SFLG Shared Flag, 0 = disable shared flags
3348          * 06      GALP Go Active On Loop, 0 = not used
3349          * 05      GLP Go On Loop, 0 = not used
3350          * 04      ODS Output Driver Select, 1=TxD is push-pull output
3351          * 03      ITF Interframe Time Fill, 0=mark, 1=flag
3352          * 02..00  CM[2..0] Clock Mode
3353          *
3354          * 0001 0000
3355          */ 
3356         val = 0x10 + clkmode;
3357         write_reg(info, CHA + CCR1, val);
3358         
3359         /* CCR2
3360          *
3361          * 07..06  BGR[9..8] Baud rate bits 9..8
3362          * 05      BDF Baud rate divisor factor, 0=1, 1=BGR value
3363          * 04      SSEL Clock source select, 1=submode b
3364          * 03      TOE 0=TxCLK is input, 0=TxCLK is input
3365          * 02      RWX Read/Write Exchange 0=disabled
3366          * 01      C32, CRC select, 0=CRC-16, 1=CRC-32
3367          * 00      DIV, data inversion 0=disabled, 1=enabled
3368          *
3369          * 0000 0000
3370          */ 
3371         val = 0x00;
3372         if (clkmode == 2 || clkmode == 3 || clkmode == 6
3373             || clkmode == 7 || (clkmode == 0 && clksubmode == 1))
3374                 val |= BIT5;
3375         if (clksubmode)
3376                 val |= BIT4;
3377         if (info->params.crc_type == HDLC_CRC_32_CCITT)
3378                 val |= BIT1;
3379         if (info->params.encoding == HDLC_ENCODING_NRZB)
3380                 val |= BIT0;
3381         write_reg(info, CHA + CCR2, val);
3382         
3383         /* CCR3
3384          *
3385          * 07..06  PRE[1..0] Preamble count 00=1, 01=2, 10=4, 11=8
3386          * 05      EPT Enable preamble transmission, 1=enabled
3387          * 04      RADD Receive address pushed to FIFO, 0=disabled
3388          * 03      CRL CRC Reset Level, 0=FFFF
3389          * 02      RCRC Rx CRC 0=On 1=Off
3390          * 01      TCRC Tx CRC 0=On 1=Off
3391          * 00      PSD DPLL Phase Shift Disable
3392          *
3393          * 0000 0000
3394          */ 
3395         val = 0x00;
3396         if (info->params.crc_type == HDLC_CRC_NONE)
3397                 val |= BIT2 + BIT1;
3398         if (info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE)
3399                 val |= BIT5;
3400         switch (info->params.preamble_length)
3401         {
3402         case HDLC_PREAMBLE_LENGTH_16BITS:
3403                 val |= BIT6;
3404                 break;
3405         case HDLC_PREAMBLE_LENGTH_32BITS:
3406                 val |= BIT6;
3407                 break;
3408         case HDLC_PREAMBLE_LENGTH_64BITS:
3409                 val |= BIT7 + BIT6;
3410                 break;
3411         }
3412         write_reg(info, CHA + CCR3, val);
3413         
3414         /* PRE - Preamble pattern */ 
3415         val = 0;
3416         switch (info->params.preamble)
3417         {
3418         case HDLC_PREAMBLE_PATTERN_FLAGS: val = 0x7e; break;
3419         case HDLC_PREAMBLE_PATTERN_10:    val = 0xaa; break;
3420         case HDLC_PREAMBLE_PATTERN_01:    val = 0x55; break;
3421         case HDLC_PREAMBLE_PATTERN_ONES:  val = 0xff; break;
3422         }
3423         write_reg(info, CHA + PRE, val);
3424         
3425         /* CCR4
3426          *
3427          * 07      MCK4 Master Clock Divide by 4, 1=enabled
3428          * 06      EBRG Enhanced Baud Rate Generator Mode, 1=enabled
3429          * 05      TST1 Test Pin, 0=normal operation
3430          * 04      ICD Ivert Carrier Detect, 1=enabled (active low)
3431          * 03..02  Reserved, must be 0
3432          * 01..00  RFT[1..0] RxFIFO Threshold 00=32 bytes
3433          *
3434          * 0101 0000
3435          */ 
3436         val = 0x50;
3437         write_reg(info, CHA + CCR4, val);
3438         if (info->params.flags & HDLC_FLAG_RXC_DPLL)
3439                 mgslpc_set_rate(info, CHA, info->params.clock_speed * 16);
3440         else
3441                 mgslpc_set_rate(info, CHA, info->params.clock_speed);
3442         
3443         /* RLCR Receive length check register
3444          *
3445          * 7     1=enable receive length check
3446          * 6..0  Max frame length = (RL + 1) * 32
3447          */ 
3448         write_reg(info, CHA + RLCR, 0);
3449         
3450         /* XBCH Transmit Byte Count High
3451          *
3452          * 07      DMA mode, 0 = interrupt driven
3453          * 06      NRM, 0=ABM (ignored)
3454          * 05      CAS Carrier Auto Start
3455          * 04      XC Transmit Continuously (ignored)
3456          * 03..00  XBC[10..8] Transmit byte count bits 10..8
3457          *
3458          * 0000 0000
3459          */ 
3460         val = 0x00;
3461         if (info->params.flags & HDLC_FLAG_AUTO_DCD)
3462                 val |= BIT5;
3463         write_reg(info, CHA + XBCH, val);
3464         enable_auxclk(info);
3465         if (info->params.loopback || info->testing_irq)
3466                 loopback_enable(info);
3467         if (info->params.flags & HDLC_FLAG_AUTO_CTS)
3468         {
3469                 irq_enable(info, CHB, IRQ_CTS);
3470                 /* PVR[3] 1=AUTO CTS active */ 
3471                 set_reg_bits(info, CHA + PVR, BIT3);
3472         } else
3473                 clear_reg_bits(info, CHA + PVR, BIT3);
3474
3475         irq_enable(info, CHA,
3476                          IRQ_RXEOM + IRQ_RXFIFO + IRQ_ALLSENT +
3477                          IRQ_UNDERRUN + IRQ_TXFIFO);
3478         issue_command(info, CHA, CMD_TXRESET + CMD_RXRESET);
3479         wait_command_complete(info, CHA);
3480         read_reg16(info, CHA + ISR);    /* clear pending IRQs */
3481         
3482         /* Master clock mode enabled above to allow reset commands
3483          * to complete even if no data clocks are present.
3484          *
3485          * Disable master clock mode for normal communications because
3486          * V3.2 of the ESCC2 has a bug that prevents the transmit all sent
3487          * IRQ when in master clock mode.
3488          *
3489          * Leave master clock mode enabled for IRQ test because the
3490          * timer IRQ used by the test can only happen in master clock mode.
3491          */ 
3492         if (!info->testing_irq)
3493                 clear_reg_bits(info, CHA + CCR0, BIT6);
3494
3495         tx_set_idle(info);
3496
3497         tx_stop(info);
3498         rx_stop(info);
3499 }
3500
3501 static void rx_stop(MGSLPC_INFO *info)
3502 {
3503         if (debug_level >= DEBUG_LEVEL_ISR)
3504                 printk("%s(%d):rx_stop(%s)\n",
3505                          __FILE__,__LINE__, info->device_name );
3506                          
3507         /* MODE:03 RAC Receiver Active, 0=inactive */ 
3508         clear_reg_bits(info, CHA + MODE, BIT3);
3509
3510         info->rx_enabled = 0;
3511         info->rx_overflow = 0;
3512 }
3513
3514 static void rx_start(MGSLPC_INFO *info)
3515 {
3516         if (debug_level >= DEBUG_LEVEL_ISR)
3517                 printk("%s(%d):rx_start(%s)\n",
3518                          __FILE__,__LINE__, info->device_name );
3519
3520         rx_reset_buffers(info);
3521         info->rx_enabled = 0;
3522         info->rx_overflow = 0;
3523
3524         /* MODE:03 RAC Receiver Active, 1=active */ 
3525         set_reg_bits(info, CHA + MODE, BIT3);
3526
3527         info->rx_enabled = 1;
3528 }
3529
3530 static void tx_start(MGSLPC_INFO *info)
3531 {
3532         if (debug_level >= DEBUG_LEVEL_ISR)
3533                 printk("%s(%d):tx_start(%s)\n",
3534                          __FILE__,__LINE__, info->device_name );
3535                          
3536         if (info->tx_count) {
3537                 /* If auto RTS enabled and RTS is inactive, then assert */
3538                 /* RTS and set a flag indicating that the driver should */
3539                 /* negate RTS when the transmission completes. */
3540                 info->drop_rts_on_tx_done = 0;
3541
3542                 if (info->params.flags & HDLC_FLAG_AUTO_RTS) {
3543                         get_signals(info);
3544                         if (!(info->serial_signals & SerialSignal_RTS)) {
3545                                 info->serial_signals |= SerialSignal_RTS;
3546                                 set_signals(info);
3547                                 info->drop_rts_on_tx_done = 1;
3548                         }
3549                 }
3550
3551                 if (info->params.mode == MGSL_MODE_ASYNC) {
3552                         if (!info->tx_active) {
3553                                 info->tx_active = 1;
3554                                 tx_ready(info);
3555                         }
3556                 } else {
3557                         info->tx_active = 1;
3558                         tx_ready(info);
3559                         info->tx_timer.expires = jiffies + msecs_to_jiffies(5000);
3560                         add_timer(&info->tx_timer);     
3561                 }
3562         }
3563
3564         if (!info->tx_enabled)
3565                 info->tx_enabled = 1;
3566 }
3567
3568 static void tx_stop(MGSLPC_INFO *info)
3569 {
3570         if (debug_level >= DEBUG_LEVEL_ISR)
3571                 printk("%s(%d):tx_stop(%s)\n",
3572                          __FILE__,__LINE__, info->device_name );
3573                          
3574         del_timer(&info->tx_timer);     
3575
3576         info->tx_enabled = 0;
3577         info->tx_active  = 0;
3578 }
3579
3580 /* Reset the adapter to a known state and prepare it for further use.
3581  */
3582 static void reset_device(MGSLPC_INFO *info)
3583 {
3584         /* power up both channels (set BIT7) */ 
3585         write_reg(info, CHA + CCR0, 0x80);
3586         write_reg(info, CHB + CCR0, 0x80);
3587         write_reg(info, CHA + MODE, 0);
3588         write_reg(info, CHB + MODE, 0);
3589         
3590         /* disable all interrupts */ 
3591         irq_disable(info, CHA, 0xffff);
3592         irq_disable(info, CHB, 0xffff);
3593         port_irq_disable(info, 0xff);
3594         
3595         /* PCR Port Configuration Register
3596          *
3597          * 07..04  DEC[3..0] Serial I/F select outputs
3598          * 03      output, 1=AUTO CTS control enabled
3599          * 02      RI Ring Indicator input 0=active
3600          * 01      DSR input 0=active
3601          * 00      DTR output 0=active
3602          *
3603          * 0000 0110
3604          */ 
3605         write_reg(info, PCR, 0x06);
3606         
3607         /* PVR Port Value Register
3608          *
3609          * 07..04  DEC[3..0] Serial I/F select (0000=disabled)
3610          * 03      AUTO CTS output 1=enabled
3611          * 02      RI Ring Indicator input
3612          * 01      DSR input
3613          * 00      DTR output (1=inactive)
3614          *
3615          * 0000 0001
3616          */
3617 //      write_reg(info, PVR, PVR_DTR);
3618         
3619         /* IPC Interrupt Port Configuration
3620          *
3621          * 07      VIS 1=Masked interrupts visible
3622          * 06..05  Reserved, 0
3623          * 04..03  SLA Slave address, 00 ignored
3624          * 02      CASM Cascading Mode, 1=daisy chain
3625          * 01..00  IC[1..0] Interrupt Config, 01=push-pull output, active low
3626          *
3627          * 0000 0101
3628          */ 
3629         write_reg(info, IPC, 0x05);
3630 }
3631
3632 static void async_mode(MGSLPC_INFO *info)
3633 {
3634         unsigned char val;
3635
3636         /* disable all interrupts */ 
3637         irq_disable(info, CHA, 0xffff);
3638         irq_disable(info, CHB, 0xffff);
3639         port_irq_disable(info, 0xff);
3640         
3641         /* MODE
3642          *
3643          * 07      Reserved, 0
3644          * 06      FRTS RTS State, 0=active
3645          * 05      FCTS Flow Control on CTS
3646          * 04      FLON Flow Control Enable
3647          * 03      RAC Receiver Active, 0 = inactive
3648          * 02      RTS 0=Auto RTS, 1=manual RTS
3649          * 01      TRS Timer Resolution, 1=512
3650          * 00      TLP Test Loop, 0 = no loop
3651          *
3652          * 0000 0110
3653          */ 
3654         val = 0x06;
3655         if (info->params.loopback)
3656                 val |= BIT0;
3657         
3658         /* preserve RTS state */ 
3659         if (!(info->serial_signals & SerialSignal_RTS))
3660                 val |= BIT6;
3661         write_reg(info, CHA + MODE, val);
3662         
3663         /* CCR0
3664          *
3665          * 07      PU Power Up, 1=active, 0=power down
3666          * 06      MCE Master Clock Enable, 1=enabled
3667          * 05      Reserved, 0
3668          * 04..02  SC[2..0] Encoding, 000=NRZ
3669          * 01..00  SM[1..0] Serial Mode, 11=Async
3670          *
3671          * 1000 0011
3672          */ 
3673         write_reg(info, CHA + CCR0, 0x83);
3674         
3675         /* CCR1
3676          *
3677          * 07..05  Reserved, 0
3678          * 04      ODS Output Driver Select, 1=TxD is push-pull output
3679          * 03      BCR Bit Clock Rate, 1=16x
3680          * 02..00  CM[2..0] Clock Mode, 111=BRG
3681          *
3682          * 0001 1111
3683          */ 
3684         write_reg(info, CHA + CCR1, 0x1f);
3685         
3686         /* CCR2 (channel A)
3687          *
3688          * 07..06  BGR[9..8] Baud rate bits 9..8
3689          * 05      BDF Baud rate divisor factor, 0=1, 1=BGR value
3690          * 04      SSEL Clock source select, 1=submode b
3691          * 03      TOE 0=TxCLK is input, 0=TxCLK is input
3692          * 02      RWX Read/Write Exchange 0=disabled
3693          * 01      Reserved, 0
3694          * 00      DIV, data inversion 0=disabled, 1=enabled
3695          *
3696          * 0001 0000
3697          */ 
3698         write_reg(info, CHA + CCR2, 0x10);
3699         
3700         /* CCR3
3701          *
3702          * 07..01  Reserved, 0
3703          * 00      PSD DPLL Phase Shift Disable
3704          *
3705          * 0000 0000
3706          */ 
3707         write_reg(info, CHA + CCR3, 0);
3708         
3709         /* CCR4
3710          *
3711          * 07      MCK4 Master Clock Divide by 4, 1=enabled
3712          * 06      EBRG Enhanced Baud Rate Generator Mode, 1=enabled
3713          * 05      TST1 Test Pin, 0=normal operation
3714          * 04      ICD Ivert Carrier Detect, 1=enabled (active low)
3715          * 03..00  Reserved, must be 0
3716          *
3717          * 0101 0000
3718          */ 
3719         write_reg(info, CHA + CCR4, 0x50);
3720         mgslpc_set_rate(info, CHA, info->params.data_rate * 16);
3721         
3722         /* DAFO Data Format
3723          *
3724          * 07      Reserved, 0
3725          * 06      XBRK transmit break, 0=normal operation
3726          * 05      Stop bits (0=1, 1=2)
3727          * 04..03  PAR[1..0] Parity (01=odd, 10=even)
3728          * 02      PAREN Parity Enable
3729          * 01..00  CHL[1..0] Character Length (00=8, 01=7)
3730          *
3731          */ 
3732         val = 0x00;
3733         if (info->params.data_bits != 8)
3734                 val |= BIT0;    /* 7 bits */
3735         if (info->params.stop_bits != 1)
3736                 val |= BIT5;
3737         if (info->params.parity != ASYNC_PARITY_NONE)
3738         {
3739                 val |= BIT2;    /* Parity enable */
3740                 if (info->params.parity == ASYNC_PARITY_ODD)
3741                         val |= BIT3;
3742                 else
3743                         val |= BIT4;
3744         }
3745         write_reg(info, CHA + DAFO, val);
3746         
3747         /* RFC Rx FIFO Control
3748          *
3749          * 07      Reserved, 0
3750          * 06      DPS, 1=parity bit not stored in data byte
3751          * 05      DXS, 0=all data stored in FIFO (including XON/XOFF)
3752          * 04      RFDF Rx FIFO Data Format, 1=status byte stored in FIFO
3753          * 03..02  RFTH[1..0], rx threshold, 11=16 status + 16 data byte
3754          * 01      Reserved, 0
3755          * 00      TCDE Terminate Char Detect Enable, 0=disabled
3756          *
3757          * 0101 1100
3758          */ 
3759         write_reg(info, CHA + RFC, 0x5c);
3760         
3761         /* RLCR Receive length check register
3762          *
3763          * Max frame length = (RL + 1) * 32
3764          */ 
3765         write_reg(info, CHA + RLCR, 0);
3766         
3767         /* XBCH Transmit Byte Count High
3768          *
3769          * 07      DMA mode, 0 = interrupt driven
3770          * 06      NRM, 0=ABM (ignored)
3771          * 05      CAS Carrier Auto Start
3772          * 04      XC Transmit Continuously (ignored)
3773          * 03..00  XBC[10..8] Transmit byte count bits 10..8
3774          *
3775          * 0000 0000
3776          */ 
3777         val = 0x00;
3778         if (info->params.flags & HDLC_FLAG_AUTO_DCD)
3779                 val |= BIT5;
3780         write_reg(info, CHA + XBCH, val);
3781         if (info->params.flags & HDLC_FLAG_AUTO_CTS)
3782                 irq_enable(info, CHA, IRQ_CTS);
3783         
3784         /* MODE:03 RAC Receiver Active, 1=active */ 
3785         set_reg_bits(info, CHA + MODE, BIT3);
3786         enable_auxclk(info);
3787         if (info->params.flags & HDLC_FLAG_AUTO_CTS) {
3788                 irq_enable(info, CHB, IRQ_CTS);
3789                 /* PVR[3] 1=AUTO CTS active */ 
3790                 set_reg_bits(info, CHA + PVR, BIT3);
3791         } else
3792                 clear_reg_bits(info, CHA + PVR, BIT3);
3793         irq_enable(info, CHA,
3794                           IRQ_RXEOM + IRQ_RXFIFO + IRQ_BREAK_ON + IRQ_RXTIME +
3795                           IRQ_ALLSENT + IRQ_TXFIFO);
3796         issue_command(info, CHA, CMD_TXRESET + CMD_RXRESET);
3797         wait_command_complete(info, CHA);
3798         read_reg16(info, CHA + ISR);    /* clear pending IRQs */
3799 }
3800
3801 /* Set the HDLC idle mode for the transmitter.
3802  */
3803 static void tx_set_idle(MGSLPC_INFO *info)
3804 {
3805         /* Note: ESCC2 only supports flags and one idle modes */ 
3806         if (info->idle_mode == HDLC_TXIDLE_FLAGS)
3807                 set_reg_bits(info, CHA + CCR1, BIT3);
3808         else
3809                 clear_reg_bits(info, CHA + CCR1, BIT3);
3810 }
3811
3812 /* get state of the V24 status (input) signals.
3813  */
3814 static void get_signals(MGSLPC_INFO *info)
3815 {
3816         unsigned char status = 0;
3817         
3818         /* preserve DTR and RTS */ 
3819         info->serial_signals &= SerialSignal_DTR + SerialSignal_RTS;
3820
3821         if (read_reg(info, CHB + VSTR) & BIT7)
3822                 info->serial_signals |= SerialSignal_DCD;
3823         if (read_reg(info, CHB + STAR) & BIT1)
3824                 info->serial_signals |= SerialSignal_CTS;
3825
3826         status = read_reg(info, CHA + PVR);
3827         if (!(status & PVR_RI))
3828                 info->serial_signals |= SerialSignal_RI;
3829         if (!(status & PVR_DSR))
3830                 info->serial_signals |= SerialSignal_DSR;
3831 }
3832
3833 /* Set the state of DTR and RTS based on contents of
3834  * serial_signals member of device extension.
3835  */
3836 static void set_signals(MGSLPC_INFO *info)
3837 {
3838         unsigned char val;
3839
3840         val = read_reg(info, CHA + MODE);
3841         if (info->params.mode == MGSL_MODE_ASYNC) {
3842                 if (info->serial_signals & SerialSignal_RTS)
3843                         val &= ~BIT6;
3844                 else
3845                         val |= BIT6;
3846         } else {
3847                 if (info->serial_signals & SerialSignal_RTS)
3848                         val |= BIT2;
3849                 else
3850                         val &= ~BIT2;
3851         }
3852         write_reg(info, CHA + MODE, val);
3853
3854         if (info->serial_signals & SerialSignal_DTR)
3855                 clear_reg_bits(info, CHA + PVR, PVR_DTR);
3856         else
3857                 set_reg_bits(info, CHA + PVR, PVR_DTR);
3858 }
3859
3860 static void rx_reset_buffers(MGSLPC_INFO *info)
3861 {
3862         RXBUF *buf;
3863         int i;
3864
3865         info->rx_put = 0;
3866         info->rx_get = 0;
3867         info->rx_frame_count = 0;
3868         for (i=0 ; i < info->rx_buf_count ; i++) {
3869                 buf = (RXBUF*)(info->rx_buf + (i * info->rx_buf_size));
3870                 buf->status = buf->count = 0;
3871         }
3872 }
3873
3874 /* Attempt to return a received HDLC frame
3875  * Only frames received without errors are returned.
3876  *
3877  * Returns 1 if frame returned, otherwise 0
3878  */
3879 static int rx_get_frame(MGSLPC_INFO *info)
3880 {
3881         unsigned short status;
3882         RXBUF *buf;
3883         unsigned int framesize = 0;
3884         unsigned long flags;
3885         struct tty_struct *tty = info->tty;
3886         int return_frame = 0;
3887         
3888         if (info->rx_frame_count == 0)
3889                 return 0;
3890
3891         buf = (RXBUF*)(info->rx_buf + (info->rx_get * info->rx_buf_size));
3892
3893         status = buf->status;
3894
3895         /* 07  VFR  1=valid frame
3896          * 06  RDO  1=data overrun
3897          * 05  CRC  1=OK, 0=error
3898          * 04  RAB  1=frame aborted
3899          */
3900         if ((status & 0xf0) != 0xA0) {
3901                 if (!(status & BIT7) || (status & BIT4))
3902                         info->icount.rxabort++;
3903                 else if (status & BIT6)
3904                         info->icount.rxover++;
3905                 else if (!(status & BIT5)) {
3906                         info->icount.rxcrc++;
3907                         if (info->params.crc_type & HDLC_CRC_RETURN_EX)
3908                                 return_frame = 1;
3909                 }
3910                 framesize = 0;
3911 #ifdef CONFIG_HDLC
3912                 {
3913                         struct net_device_stats *stats = hdlc_stats(info->netdev);
3914                         stats->rx_errors++;
3915                         stats->rx_frame_errors++;
3916                 }
3917 #endif
3918         } else
3919                 return_frame = 1;
3920
3921         if (return_frame)
3922                 framesize = buf->count;
3923
3924         if (debug_level >= DEBUG_LEVEL_BH)
3925                 printk("%s(%d):rx_get_frame(%s) status=%04X size=%d\n",
3926                         __FILE__,__LINE__,info->device_name,status,framesize);
3927                         
3928         if (debug_level >= DEBUG_LEVEL_DATA)
3929                 trace_block(info, buf->data, framesize, 0);     
3930                 
3931         if (framesize) {
3932                 if ((info->params.crc_type & HDLC_CRC_RETURN_EX &&
3933                       framesize+1 > info->max_frame_size) ||
3934                     framesize > info->max_frame_size)
3935                         info->icount.rxlong++;
3936                 else {
3937                         if (status & BIT5)
3938                                 info->icount.rxok++;
3939
3940                         if (info->params.crc_type & HDLC_CRC_RETURN_EX) {
3941                                 *(buf->data + framesize) = status & BIT5 ? RX_OK:RX_CRC_ERROR;
3942                                 ++framesize;
3943                         }
3944
3945 #ifdef CONFIG_HDLC
3946                         if (info->netcount)
3947                                 hdlcdev_rx(info, buf->data, framesize);
3948                         else
3949 #endif
3950                                 ldisc_receive_buf(tty, buf->data, info->flag_buf, framesize);
3951                 }
3952         }
3953
3954         spin_lock_irqsave(&info->lock,flags);
3955         buf->status = buf->count = 0;
3956         info->rx_frame_count--;
3957         info->rx_get++;
3958         if (info->rx_get >= info->rx_buf_count)
3959                 info->rx_get = 0;
3960         spin_unlock_irqrestore(&info->lock,flags);
3961
3962         return 1;
3963 }
3964
3965 static BOOLEAN register_test(MGSLPC_INFO *info)
3966 {
3967         static unsigned char patterns[] = 
3968             { 0x00, 0xff, 0xaa, 0x55, 0x69, 0x96, 0x0f };
3969         static unsigned int count = ARRAY_SIZE(patterns);
3970         unsigned int i;
3971         BOOLEAN rc = TRUE;
3972         unsigned long flags;
3973
3974         spin_lock_irqsave(&info->lock,flags);
3975         reset_device(info);
3976
3977         for (i = 0; i < count; i++) {
3978                 write_reg(info, XAD1, patterns[i]);
3979                 write_reg(info, XAD2, patterns[(i + 1) % count]);
3980                 if ((read_reg(info, XAD1) != patterns[i]) ||
3981                     (read_reg(info, XAD2) != patterns[(i + 1) % count])) {
3982                         rc = FALSE;
3983                         break;
3984                 }
3985         }
3986
3987         spin_unlock_irqrestore(&info->lock,flags);
3988         return rc;
3989 }
3990
3991 static BOOLEAN irq_test(MGSLPC_INFO *info)
3992 {
3993         unsigned long end_time;
3994         unsigned long flags;
3995
3996         spin_lock_irqsave(&info->lock,flags);
3997         reset_device(info);
3998
3999         info->testing_irq = TRUE;
4000         hdlc_mode(info);
4001
4002         info->irq_occurred = FALSE;
4003
4004         /* init hdlc mode */
4005
4006         irq_enable(info, CHA, IRQ_TIMER);
4007         write_reg(info, CHA + TIMR, 0); /* 512 cycles */
4008         issue_command(info, CHA, CMD_START_TIMER);
4009
4010         spin_unlock_irqrestore(&info->lock,flags);
4011
4012         end_time=100;
4013         while(end_time-- && !info->irq_occurred) {
4014                 msleep_interruptible(10);
4015         }
4016         
4017         info->testing_irq = FALSE;
4018
4019         spin_lock_irqsave(&info->lock,flags);
4020         reset_device(info);
4021         spin_unlock_irqrestore(&info->lock,flags);
4022         
4023         return info->irq_occurred ? TRUE : FALSE;
4024 }
4025
4026 static int adapter_test(MGSLPC_INFO *info)
4027 {
4028         if (!register_test(info)) {
4029                 info->init_error = DiagStatus_AddressFailure;
4030                 printk( "%s(%d):Register test failure for device %s Addr=%04X\n",
4031                         __FILE__,__LINE__,info->device_name, (unsigned short)(info->io_base) );
4032                 return -ENODEV;
4033         }
4034
4035         if (!irq_test(info)) {
4036                 info->init_error = DiagStatus_IrqFailure;
4037                 printk( "%s(%d):Interrupt test failure for device %s IRQ=%d\n",
4038                         __FILE__,__LINE__,info->device_name, (unsigned short)(info->irq_level) );
4039                 return -ENODEV;
4040         }
4041
4042         if (debug_level >= DEBUG_LEVEL_INFO)
4043                 printk("%s(%d):device %s passed diagnostics\n",
4044                         __FILE__,__LINE__,info->device_name);
4045         return 0;
4046 }
4047
4048 static void trace_block(MGSLPC_INFO *info,const char* data, int count, int xmit)
4049 {
4050         int i;
4051         int linecount;
4052         if (xmit)
4053                 printk("%s tx data:\n",info->device_name);
4054         else
4055                 printk("%s rx data:\n",info->device_name);
4056                 
4057         while(count) {
4058                 if (count > 16)
4059                         linecount = 16;
4060                 else
4061                         linecount = count;
4062                         
4063                 for(i=0;i<linecount;i++)
4064                         printk("%02X ",(unsigned char)data[i]);
4065                 for(;i<17;i++)
4066                         printk("   ");
4067                 for(i=0;i<linecount;i++) {
4068                         if (data[i]>=040 && data[i]<=0176)
4069                                 printk("%c",data[i]);
4070                         else
4071                                 printk(".");
4072                 }
4073                 printk("\n");
4074                 
4075                 data  += linecount;
4076                 count -= linecount;
4077         }
4078 }
4079
4080 /* HDLC frame time out
4081  * update stats and do tx completion processing
4082  */
4083 static void tx_timeout(unsigned long context)
4084 {
4085         MGSLPC_INFO *info = (MGSLPC_INFO*)context;
4086         unsigned long flags;
4087         
4088         if ( debug_level >= DEBUG_LEVEL_INFO )
4089                 printk( "%s(%d):tx_timeout(%s)\n",
4090                         __FILE__,__LINE__,info->device_name);
4091         if(info->tx_active &&
4092            info->params.mode == MGSL_MODE_HDLC) {
4093                 info->icount.txtimeout++;
4094         }
4095         spin_lock_irqsave(&info->lock,flags);
4096         info->tx_active = 0;
4097         info->tx_count = info->tx_put = info->tx_get = 0;
4098
4099         spin_unlock_irqrestore(&info->lock,flags);
4100         
4101 #ifdef CONFIG_HDLC
4102         if (info->netcount)
4103                 hdlcdev_tx_done(info);
4104         else
4105 #endif
4106                 bh_transmit(info);
4107 }
4108
4109 #ifdef CONFIG_HDLC
4110
4111 /**
4112  * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
4113  * set encoding and frame check sequence (FCS) options
4114  *
4115  * dev       pointer to network device structure
4116  * encoding  serial encoding setting
4117  * parity    FCS setting
4118  *
4119  * returns 0 if success, otherwise error code
4120  */
4121 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
4122                           unsigned short parity)
4123 {
4124         MGSLPC_INFO *info = dev_to_port(dev);
4125         unsigned char  new_encoding;
4126         unsigned short new_crctype;
4127
4128         /* return error if TTY interface open */
4129         if (info->count)
4130                 return -EBUSY;
4131
4132         switch (encoding)
4133         {
4134         case ENCODING_NRZ:        new_encoding = HDLC_ENCODING_NRZ; break;
4135         case ENCODING_NRZI:       new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
4136         case ENCODING_FM_MARK:    new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
4137         case ENCODING_FM_SPACE:   new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
4138         case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
4139         default: return -EINVAL;
4140         }
4141
4142         switch (parity)
4143         {
4144         case PARITY_NONE:            new_crctype = HDLC_CRC_NONE; break;
4145         case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
4146         case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
4147         default: return -EINVAL;
4148         }
4149
4150         info->params.encoding = new_encoding;
4151         info->params.crc_type = new_crctype;
4152
4153         /* if network interface up, reprogram hardware */
4154         if (info->netcount)
4155                 mgslpc_program_hw(info);
4156
4157         return 0;
4158 }
4159
4160 /**
4161  * called by generic HDLC layer to send frame
4162  *
4163  * skb  socket buffer containing HDLC frame
4164  * dev  pointer to network device structure
4165  *
4166  * returns 0 if success, otherwise error code
4167  */
4168 static int hdlcdev_xmit(struct sk_buff *skb, struct net_device *dev)
4169 {
4170         MGSLPC_INFO *info = dev_to_port(dev);
4171         struct net_device_stats *stats = hdlc_stats(dev);
4172         unsigned long flags;
4173
4174         if (debug_level >= DEBUG_LEVEL_INFO)
4175                 printk(KERN_INFO "%s:hdlc_xmit(%s)\n",__FILE__,dev->name);
4176
4177         /* stop sending until this frame completes */
4178         netif_stop_queue(dev);
4179
4180         /* copy data to device buffers */
4181         memcpy(info->tx_buf, skb->data, skb->len);
4182         info->tx_get = 0;
4183         info->tx_put = info->tx_count = skb->len;
4184
4185         /* update network statistics */
4186         stats->tx_packets++;
4187         stats->tx_bytes += skb->len;
4188
4189         /* done with socket buffer, so free it */
4190         dev_kfree_skb(skb);
4191
4192         /* save start time for transmit timeout detection */
4193         dev->trans_start = jiffies;
4194
4195         /* start hardware transmitter if necessary */
4196         spin_lock_irqsave(&info->lock,flags);
4197         if (!info->tx_active)
4198                 tx_start(info);
4199         spin_unlock_irqrestore(&info->lock,flags);
4200
4201         return 0;
4202 }
4203
4204 /**
4205  * called by network layer when interface enabled
4206  * claim resources and initialize hardware
4207  *
4208  * dev  pointer to network device structure
4209  *
4210  * returns 0 if success, otherwise error code
4211  */
4212 static int hdlcdev_open(struct net_device *dev)
4213 {
4214         MGSLPC_INFO *info = dev_to_port(dev);
4215         int rc;
4216         unsigned long flags;
4217
4218         if (debug_level >= DEBUG_LEVEL_INFO)
4219                 printk("%s:hdlcdev_open(%s)\n",__FILE__,dev->name);
4220
4221         /* generic HDLC layer open processing */
4222         if ((rc = hdlc_open(dev)))
4223                 return rc;
4224
4225         /* arbitrate between network and tty opens */
4226         spin_lock_irqsave(&info->netlock, flags);
4227         if (info->count != 0 || info->netcount != 0) {
4228                 printk(KERN_WARNING "%s: hdlc_open returning busy\n", dev->name);
4229                 spin_unlock_irqrestore(&info->netlock, flags);
4230                 return -EBUSY;
4231         }
4232         info->netcount=1;
4233         spin_unlock_irqrestore(&info->netlock, flags);
4234
4235         /* claim resources and init adapter */
4236         if ((rc = startup(info)) != 0) {
4237                 spin_lock_irqsave(&info->netlock, flags);
4238                 info->netcount=0;
4239                 spin_unlock_irqrestore(&info->netlock, flags);
4240                 return rc;
4241         }
4242
4243         /* assert DTR and RTS, apply hardware settings */
4244         info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
4245         mgslpc_program_hw(info);
4246
4247         /* enable network layer transmit */
4248         dev->trans_start = jiffies;
4249         netif_start_queue(dev);
4250
4251         /* inform generic HDLC layer of current DCD status */
4252         spin_lock_irqsave(&info->lock, flags);
4253         get_signals(info);
4254         spin_unlock_irqrestore(&info->lock, flags);
4255         if (info->serial_signals & SerialSignal_DCD)
4256                 netif_carrier_on(dev);
4257         else
4258                 netif_carrier_off(dev);
4259         return 0;
4260 }
4261
4262 /**
4263  * called by network layer when interface is disabled
4264  * shutdown hardware and release resources
4265  *
4266  * dev  pointer to network device structure
4267  *
4268  * returns 0 if success, otherwise error code
4269  */
4270 static int hdlcdev_close(struct net_device *dev)
4271 {
4272         MGSLPC_INFO *info = dev_to_port(dev);
4273         unsigned long flags;
4274
4275         if (debug_level >= DEBUG_LEVEL_INFO)
4276                 printk("%s:hdlcdev_close(%s)\n",__FILE__,dev->name);
4277
4278         netif_stop_queue(dev);
4279
4280         /* shutdown adapter and release resources */
4281         shutdown(info);
4282
4283         hdlc_close(dev);
4284
4285         spin_lock_irqsave(&info->netlock, flags);
4286         info->netcount=0;
4287         spin_unlock_irqrestore(&info->netlock, flags);
4288
4289         return 0;
4290 }
4291
4292 /**
4293  * called by network layer to process IOCTL call to network device
4294  *
4295  * dev  pointer to network device structure
4296  * ifr  pointer to network interface request structure
4297  * cmd  IOCTL command code
4298  *
4299  * returns 0 if success, otherwise error code
4300  */
4301 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
4302 {
4303         const size_t size = sizeof(sync_serial_settings);
4304         sync_serial_settings new_line;
4305         sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
4306         MGSLPC_INFO *info = dev_to_port(dev);
4307         unsigned int flags;
4308
4309         if (debug_level >= DEBUG_LEVEL_INFO)
4310                 printk("%s:hdlcdev_ioctl(%s)\n",__FILE__,dev->name);
4311
4312         /* return error if TTY interface open */
4313         if (info->count)
4314                 return -EBUSY;
4315
4316         if (cmd != SIOCWANDEV)
4317                 return hdlc_ioctl(dev, ifr, cmd);
4318
4319         switch(ifr->ifr_settings.type) {
4320         case IF_GET_IFACE: /* return current sync_serial_settings */
4321
4322                 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
4323                 if (ifr->ifr_settings.size < size) {
4324                         ifr->ifr_settings.size = size; /* data size wanted */
4325                         return -ENOBUFS;
4326                 }
4327
4328                 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
4329                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
4330                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
4331                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
4332
4333                 switch (flags){
4334                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
4335                 case (HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_INT; break;
4336                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_TXINT; break;
4337                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
4338                 default: new_line.clock_type = CLOCK_DEFAULT;
4339                 }
4340
4341                 new_line.clock_rate = info->params.clock_speed;
4342                 new_line.loopback   = info->params.loopback ? 1:0;
4343
4344                 if (copy_to_user(line, &new_line, size))
4345                         return -EFAULT;
4346                 return 0;
4347
4348         case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
4349
4350                 if(!capable(CAP_NET_ADMIN))
4351                         return -EPERM;
4352                 if (copy_from_user(&new_line, line, size))
4353                         return -EFAULT;
4354
4355                 switch (new_line.clock_type)
4356                 {
4357                 case CLOCK_EXT:      flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
4358                 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
4359                 case CLOCK_INT:      flags = HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG;    break;
4360                 case CLOCK_TXINT:    flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG;    break;
4361                 case CLOCK_DEFAULT:  flags = info->params.flags &
4362                                              (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
4363                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
4364                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
4365                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN); break;
4366                 default: return -EINVAL;
4367                 }
4368
4369                 if (new_line.loopback != 0 && new_line.loopback != 1)
4370                         return -EINVAL;
4371
4372                 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
4373                                         HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
4374                                         HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
4375                                         HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
4376                 info->params.flags |= flags;
4377
4378                 info->params.loopback = new_line.loopback;
4379
4380                 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
4381                         info->params.clock_speed = new_line.clock_rate;
4382                 else
4383                         info->params.clock_speed = 0;
4384
4385                 /* if network interface up, reprogram hardware */
4386                 if (info->netcount)
4387                         mgslpc_program_hw(info);
4388                 return 0;
4389
4390         default:
4391                 return hdlc_ioctl(dev, ifr, cmd);
4392         }
4393 }
4394
4395 /**
4396  * called by network layer when transmit timeout is detected
4397  *
4398  * dev  pointer to network device structure
4399  */
4400 static void hdlcdev_tx_timeout(struct net_device *dev)
4401 {
4402         MGSLPC_INFO *info = dev_to_port(dev);
4403         struct net_device_stats *stats = hdlc_stats(dev);
4404         unsigned long flags;
4405
4406         if (debug_level >= DEBUG_LEVEL_INFO)
4407                 printk("hdlcdev_tx_timeout(%s)\n",dev->name);
4408
4409         stats->tx_errors++;
4410         stats->tx_aborted_errors++;
4411
4412         spin_lock_irqsave(&info->lock,flags);
4413         tx_stop(info);
4414         spin_unlock_irqrestore(&info->lock,flags);
4415
4416         netif_wake_queue(dev);
4417 }
4418
4419 /**
4420  * called by device driver when transmit completes
4421  * reenable network layer transmit if stopped
4422  *
4423  * info  pointer to device instance information
4424  */
4425 static void hdlcdev_tx_done(MGSLPC_INFO *info)
4426 {
4427         if (netif_queue_stopped(info->netdev))
4428                 netif_wake_queue(info->netdev);
4429 }
4430
4431 /**
4432  * called by device driver when frame received
4433  * pass frame to network layer
4434  *
4435  * info  pointer to device instance information
4436  * buf   pointer to buffer contianing frame data
4437  * size  count of data bytes in buf
4438  */
4439 static void hdlcdev_rx(MGSLPC_INFO *info, char *buf, int size)
4440 {
4441         struct sk_buff *skb = dev_alloc_skb(size);
4442         struct net_device *dev = info->netdev;
4443         struct net_device_stats *stats = hdlc_stats(dev);
4444
4445         if (debug_level >= DEBUG_LEVEL_INFO)
4446                 printk("hdlcdev_rx(%s)\n",dev->name);
4447
4448         if (skb == NULL) {
4449                 printk(KERN_NOTICE "%s: can't alloc skb, dropping packet\n", dev->name);
4450                 stats->rx_dropped++;
4451                 return;
4452         }
4453
4454         memcpy(skb_put(skb, size),buf,size);
4455
4456         skb->protocol = hdlc_type_trans(skb, info->netdev);
4457
4458         stats->rx_packets++;
4459         stats->rx_bytes += size;
4460
4461         netif_rx(skb);
4462
4463         info->netdev->last_rx = jiffies;
4464 }
4465
4466 /**
4467  * called by device driver when adding device instance
4468  * do generic HDLC initialization
4469  *
4470  * info  pointer to device instance information
4471  *
4472  * returns 0 if success, otherwise error code
4473  */
4474 static int hdlcdev_init(MGSLPC_INFO *info)
4475 {
4476         int rc;
4477         struct net_device *dev;
4478         hdlc_device *hdlc;
4479
4480         /* allocate and initialize network and HDLC layer objects */
4481
4482         if (!(dev = alloc_hdlcdev(info))) {
4483                 printk(KERN_ERR "%s:hdlc device allocation failure\n",__FILE__);
4484                 return -ENOMEM;
4485         }
4486
4487         /* for network layer reporting purposes only */
4488         dev->base_addr = info->io_base;
4489         dev->irq       = info->irq_level;
4490
4491         /* network layer callbacks and settings */
4492         dev->do_ioctl       = hdlcdev_ioctl;
4493         dev->open           = hdlcdev_open;
4494         dev->stop           = hdlcdev_close;
4495         dev->tx_timeout     = hdlcdev_tx_timeout;
4496         dev->watchdog_timeo = 10*HZ;
4497         dev->tx_queue_len   = 50;
4498
4499         /* generic HDLC layer callbacks and settings */
4500         hdlc         = dev_to_hdlc(dev);
4501         hdlc->attach = hdlcdev_attach;
4502         hdlc->xmit   = hdlcdev_xmit;
4503
4504         /* register objects with HDLC layer */
4505         if ((rc = register_hdlc_device(dev))) {
4506                 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
4507                 free_netdev(dev);
4508                 return rc;
4509         }
4510
4511         info->netdev = dev;
4512         return 0;
4513 }
4514
4515 /**
4516  * called by device driver when removing device instance
4517  * do generic HDLC cleanup
4518  *
4519  * info  pointer to device instance information
4520  */
4521 static void hdlcdev_exit(MGSLPC_INFO *info)
4522 {
4523         unregister_hdlc_device(info->netdev);
4524         free_netdev(info->netdev);
4525         info->netdev = NULL;
4526 }
4527
4528 #endif /* CONFIG_HDLC */
4529