drivers/char: minor irq handler cleanups
[linux-2.6.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/tty.h>
46 #include <linux/tty_flip.h>
47 #include <linux/serial.h>
48 #include <linux/major.h>
49 #include <linux/string.h>
50 #include <linux/fcntl.h>
51 #include <linux/ptrace.h>
52 #include <linux/ioport.h>
53 #include <linux/mm.h>
54 #include <linux/slab.h>
55 #include <linux/netdevice.h>
56 #include <linux/vmalloc.h>
57 #include <linux/init.h>
58 #include <linux/delay.h>
59 #include <linux/ioctl.h>
60 #include <linux/synclink.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 #if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINK_CS_MODULE))
79 #define SYNCLINK_GENERIC_HDLC 1
80 #else
81 #define SYNCLINK_GENERIC_HDLC 0
82 #endif
83
84 #define GET_USER(error,value,addr) error = get_user(value,addr)
85 #define COPY_FROM_USER(error,dest,src,size) error = copy_from_user(dest,src,size) ? -EFAULT : 0
86 #define PUT_USER(error,value,addr) error = put_user(value,addr)
87 #define COPY_TO_USER(error,dest,src,size) error = copy_to_user(dest,src,size) ? -EFAULT : 0
88
89 #include <asm/uaccess.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 #if SYNCLINK_GENERIC_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 #if SYNCLINK_GENERIC_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(struct work_struct *work);
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 = kzalloc(sizeof(MGSLPC_INFO), GFP_KERNEL);
543     if (!info) {
544             printk("Error can't allocate device instance data\n");
545             return -ENOMEM;
546     }
547
548     info->magic = MGSLPC_MAGIC;
549     INIT_WORK(&info->task, bh_handler);
550     info->max_frame_size = 4096;
551     info->close_delay = 5*HZ/10;
552     info->closing_wait = 30*HZ;
553     init_waitqueue_head(&info->open_wait);
554     init_waitqueue_head(&info->close_wait);
555     init_waitqueue_head(&info->status_event_wait_q);
556     init_waitqueue_head(&info->event_wait_q);
557     spin_lock_init(&info->lock);
558     spin_lock_init(&info->netlock);
559     memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
560     info->idle_mode = HDLC_TXIDLE_FLAGS;
561     info->imra_value = 0xffff;
562     info->imrb_value = 0xffff;
563     info->pim_value = 0xff;
564
565     info->p_dev = link;
566     link->priv = info;
567
568     /* Initialize the struct pcmcia_device structure */
569
570     /* Interrupt setup */
571     link->irq.Attributes = IRQ_TYPE_EXCLUSIVE;
572     link->irq.IRQInfo1   = IRQ_LEVEL_ID;
573     link->irq.Handler = NULL;
574
575     link->conf.Attributes = 0;
576     link->conf.IntType = INT_MEMORY_AND_IO;
577
578     ret = mgslpc_config(link);
579     if (ret)
580             return ret;
581
582     mgslpc_add_device(info);
583
584     return 0;
585 }
586
587 /* Card has been inserted.
588  */
589
590 #define CS_CHECK(fn, ret) \
591 do { last_fn = (fn); if ((last_ret = (ret)) != 0) goto cs_failed; } while (0)
592
593 static int mgslpc_config(struct pcmcia_device *link)
594 {
595     MGSLPC_INFO *info = link->priv;
596     tuple_t tuple;
597     cisparse_t parse;
598     int last_fn, last_ret;
599     u_char buf[64];
600     cistpl_cftable_entry_t dflt = { 0 };
601     cistpl_cftable_entry_t *cfg;
602
603     if (debug_level >= DEBUG_LEVEL_INFO)
604             printk("mgslpc_config(0x%p)\n", link);
605
606     tuple.Attributes = 0;
607     tuple.TupleData = buf;
608     tuple.TupleDataMax = sizeof(buf);
609     tuple.TupleOffset = 0;
610
611     /* get CIS configuration entry */
612
613     tuple.DesiredTuple = CISTPL_CFTABLE_ENTRY;
614     CS_CHECK(GetFirstTuple, pcmcia_get_first_tuple(link, &tuple));
615
616     cfg = &(parse.cftable_entry);
617     CS_CHECK(GetTupleData, pcmcia_get_tuple_data(link, &tuple));
618     CS_CHECK(ParseTuple, pcmcia_parse_tuple(link, &tuple, &parse));
619
620     if (cfg->flags & CISTPL_CFTABLE_DEFAULT) dflt = *cfg;
621     if (cfg->index == 0)
622             goto cs_failed;
623
624     link->conf.ConfigIndex = cfg->index;
625     link->conf.Attributes |= CONF_ENABLE_IRQ;
626
627     /* IO window settings */
628     link->io.NumPorts1 = 0;
629     if ((cfg->io.nwin > 0) || (dflt.io.nwin > 0)) {
630             cistpl_io_t *io = (cfg->io.nwin) ? &cfg->io : &dflt.io;
631             link->io.Attributes1 = IO_DATA_PATH_WIDTH_AUTO;
632             if (!(io->flags & CISTPL_IO_8BIT))
633                     link->io.Attributes1 = IO_DATA_PATH_WIDTH_16;
634             if (!(io->flags & CISTPL_IO_16BIT))
635                     link->io.Attributes1 = IO_DATA_PATH_WIDTH_8;
636             link->io.IOAddrLines = io->flags & CISTPL_IO_LINES_MASK;
637             link->io.BasePort1 = io->win[0].base;
638             link->io.NumPorts1 = io->win[0].len;
639             CS_CHECK(RequestIO, pcmcia_request_io(link, &link->io));
640     }
641
642     link->conf.Attributes = CONF_ENABLE_IRQ;
643     link->conf.IntType = INT_MEMORY_AND_IO;
644     link->conf.ConfigIndex = 8;
645     link->conf.Present = PRESENT_OPTION;
646
647     link->irq.Attributes |= IRQ_HANDLE_PRESENT;
648     link->irq.Handler     = mgslpc_isr;
649     link->irq.Instance    = info;
650     CS_CHECK(RequestIRQ, pcmcia_request_irq(link, &link->irq));
651
652     CS_CHECK(RequestConfiguration, pcmcia_request_configuration(link, &link->conf));
653
654     info->io_base = link->io.BasePort1;
655     info->irq_level = link->irq.AssignedIRQ;
656
657     /* add to linked list of devices */
658     sprintf(info->node.dev_name, "mgslpc0");
659     info->node.major = info->node.minor = 0;
660     link->dev_node = &info->node;
661
662     printk(KERN_INFO "%s: index 0x%02x:",
663            info->node.dev_name, link->conf.ConfigIndex);
664     if (link->conf.Attributes & CONF_ENABLE_IRQ)
665             printk(", irq %d", link->irq.AssignedIRQ);
666     if (link->io.NumPorts1)
667             printk(", io 0x%04x-0x%04x", link->io.BasePort1,
668                    link->io.BasePort1+link->io.NumPorts1-1);
669     printk("\n");
670     return 0;
671
672 cs_failed:
673     cs_error(link, last_fn, last_ret);
674     mgslpc_release((u_long)link);
675     return -ENODEV;
676 }
677
678 /* Card has been removed.
679  * Unregister device and release PCMCIA configuration.
680  * If device is open, postpone until it is closed.
681  */
682 static void mgslpc_release(u_long arg)
683 {
684         struct pcmcia_device *link = (struct pcmcia_device *)arg;
685
686         if (debug_level >= DEBUG_LEVEL_INFO)
687                 printk("mgslpc_release(0x%p)\n", link);
688
689         pcmcia_disable_device(link);
690 }
691
692 static void mgslpc_detach(struct pcmcia_device *link)
693 {
694         if (debug_level >= DEBUG_LEVEL_INFO)
695                 printk("mgslpc_detach(0x%p)\n", link);
696
697         ((MGSLPC_INFO *)link->priv)->stop = 1;
698         mgslpc_release((u_long)link);
699
700         mgslpc_remove_device((MGSLPC_INFO *)link->priv);
701 }
702
703 static int mgslpc_suspend(struct pcmcia_device *link)
704 {
705         MGSLPC_INFO *info = link->priv;
706
707         info->stop = 1;
708
709         return 0;
710 }
711
712 static int mgslpc_resume(struct pcmcia_device *link)
713 {
714         MGSLPC_INFO *info = link->priv;
715
716         info->stop = 0;
717
718         return 0;
719 }
720
721
722 static inline int mgslpc_paranoia_check(MGSLPC_INFO *info,
723                                         char *name, const char *routine)
724 {
725 #ifdef MGSLPC_PARANOIA_CHECK
726         static const char *badmagic =
727                 "Warning: bad magic number for mgsl struct (%s) in %s\n";
728         static const char *badinfo =
729                 "Warning: null mgslpc_info for (%s) in %s\n";
730
731         if (!info) {
732                 printk(badinfo, name, routine);
733                 return 1;
734         }
735         if (info->magic != MGSLPC_MAGIC) {
736                 printk(badmagic, name, routine);
737                 return 1;
738         }
739 #else
740         if (!info)
741                 return 1;
742 #endif
743         return 0;
744 }
745
746
747 #define CMD_RXFIFO      BIT7    // release current rx FIFO
748 #define CMD_RXRESET     BIT6    // receiver reset
749 #define CMD_RXFIFO_READ BIT5
750 #define CMD_START_TIMER BIT4
751 #define CMD_TXFIFO      BIT3    // release current tx FIFO
752 #define CMD_TXEOM       BIT1    // transmit end message
753 #define CMD_TXRESET     BIT0    // transmit reset
754
755 static BOOLEAN wait_command_complete(MGSLPC_INFO *info, unsigned char channel)
756 {
757         int i = 0;
758         /* wait for command completion */
759         while (read_reg(info, (unsigned char)(channel+STAR)) & BIT2) {
760                 udelay(1);
761                 if (i++ == 1000)
762                         return FALSE;
763         }
764         return TRUE;
765 }
766
767 static void issue_command(MGSLPC_INFO *info, unsigned char channel, unsigned char cmd)
768 {
769         wait_command_complete(info, channel);
770         write_reg(info, (unsigned char) (channel + CMDR), cmd);
771 }
772
773 static void tx_pause(struct tty_struct *tty)
774 {
775         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
776         unsigned long flags;
777
778         if (mgslpc_paranoia_check(info, tty->name, "tx_pause"))
779                 return;
780         if (debug_level >= DEBUG_LEVEL_INFO)
781                 printk("tx_pause(%s)\n",info->device_name);
782
783         spin_lock_irqsave(&info->lock,flags);
784         if (info->tx_enabled)
785                 tx_stop(info);
786         spin_unlock_irqrestore(&info->lock,flags);
787 }
788
789 static void tx_release(struct tty_struct *tty)
790 {
791         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
792         unsigned long flags;
793
794         if (mgslpc_paranoia_check(info, tty->name, "tx_release"))
795                 return;
796         if (debug_level >= DEBUG_LEVEL_INFO)
797                 printk("tx_release(%s)\n",info->device_name);
798
799         spin_lock_irqsave(&info->lock,flags);
800         if (!info->tx_enabled)
801                 tx_start(info);
802         spin_unlock_irqrestore(&info->lock,flags);
803 }
804
805 /* Return next bottom half action to perform.
806  * or 0 if nothing to do.
807  */
808 static int bh_action(MGSLPC_INFO *info)
809 {
810         unsigned long flags;
811         int rc = 0;
812
813         spin_lock_irqsave(&info->lock,flags);
814
815         if (info->pending_bh & BH_RECEIVE) {
816                 info->pending_bh &= ~BH_RECEIVE;
817                 rc = BH_RECEIVE;
818         } else if (info->pending_bh & BH_TRANSMIT) {
819                 info->pending_bh &= ~BH_TRANSMIT;
820                 rc = BH_TRANSMIT;
821         } else if (info->pending_bh & BH_STATUS) {
822                 info->pending_bh &= ~BH_STATUS;
823                 rc = BH_STATUS;
824         }
825
826         if (!rc) {
827                 /* Mark BH routine as complete */
828                 info->bh_running   = 0;
829                 info->bh_requested = 0;
830         }
831
832         spin_unlock_irqrestore(&info->lock,flags);
833
834         return rc;
835 }
836
837 static void bh_handler(struct work_struct *work)
838 {
839         MGSLPC_INFO *info = container_of(work, MGSLPC_INFO, task);
840         int action;
841
842         if (!info)
843                 return;
844
845         if (debug_level >= DEBUG_LEVEL_BH)
846                 printk( "%s(%d):bh_handler(%s) entry\n",
847                         __FILE__,__LINE__,info->device_name);
848
849         info->bh_running = 1;
850
851         while((action = bh_action(info)) != 0) {
852
853                 /* Process work item */
854                 if ( debug_level >= DEBUG_LEVEL_BH )
855                         printk( "%s(%d):bh_handler() work item action=%d\n",
856                                 __FILE__,__LINE__,action);
857
858                 switch (action) {
859
860                 case BH_RECEIVE:
861                         while(rx_get_frame(info));
862                         break;
863                 case BH_TRANSMIT:
864                         bh_transmit(info);
865                         break;
866                 case BH_STATUS:
867                         bh_status(info);
868                         break;
869                 default:
870                         /* unknown work item ID */
871                         printk("Unknown work item ID=%08X!\n", action);
872                         break;
873                 }
874         }
875
876         if (debug_level >= DEBUG_LEVEL_BH)
877                 printk( "%s(%d):bh_handler(%s) exit\n",
878                         __FILE__,__LINE__,info->device_name);
879 }
880
881 static void bh_transmit(MGSLPC_INFO *info)
882 {
883         struct tty_struct *tty = info->tty;
884         if (debug_level >= DEBUG_LEVEL_BH)
885                 printk("bh_transmit() entry on %s\n", info->device_name);
886
887         if (tty)
888                 tty_wakeup(tty);
889 }
890
891 static void bh_status(MGSLPC_INFO *info)
892 {
893         info->ri_chkcount = 0;
894         info->dsr_chkcount = 0;
895         info->dcd_chkcount = 0;
896         info->cts_chkcount = 0;
897 }
898
899 /* eom: non-zero = end of frame */
900 static void rx_ready_hdlc(MGSLPC_INFO *info, int eom)
901 {
902         unsigned char data[2];
903         unsigned char fifo_count, read_count, i;
904         RXBUF *buf = (RXBUF*)(info->rx_buf + (info->rx_put * info->rx_buf_size));
905
906         if (debug_level >= DEBUG_LEVEL_ISR)
907                 printk("%s(%d):rx_ready_hdlc(eom=%d)\n",__FILE__,__LINE__,eom);
908
909         if (!info->rx_enabled)
910                 return;
911
912         if (info->rx_frame_count >= info->rx_buf_count) {
913                 /* no more free buffers */
914                 issue_command(info, CHA, CMD_RXRESET);
915                 info->pending_bh |= BH_RECEIVE;
916                 info->rx_overflow = 1;
917                 info->icount.buf_overrun++;
918                 return;
919         }
920
921         if (eom) {
922                 /* end of frame, get FIFO count from RBCL register */
923                 if (!(fifo_count = (unsigned char)(read_reg(info, CHA+RBCL) & 0x1f)))
924                         fifo_count = 32;
925         } else
926                 fifo_count = 32;
927
928         do {
929                 if (fifo_count == 1) {
930                         read_count = 1;
931                         data[0] = read_reg(info, CHA + RXFIFO);
932                 } else {
933                         read_count = 2;
934                         *((unsigned short *) data) = read_reg16(info, CHA + RXFIFO);
935                 }
936                 fifo_count -= read_count;
937                 if (!fifo_count && eom)
938                         buf->status = data[--read_count];
939
940                 for (i = 0; i < read_count; i++) {
941                         if (buf->count >= info->max_frame_size) {
942                                 /* frame too large, reset receiver and reset current buffer */
943                                 issue_command(info, CHA, CMD_RXRESET);
944                                 buf->count = 0;
945                                 return;
946                         }
947                         *(buf->data + buf->count) = data[i];
948                         buf->count++;
949                 }
950         } while (fifo_count);
951
952         if (eom) {
953                 info->pending_bh |= BH_RECEIVE;
954                 info->rx_frame_count++;
955                 info->rx_put++;
956                 if (info->rx_put >= info->rx_buf_count)
957                         info->rx_put = 0;
958         }
959         issue_command(info, CHA, CMD_RXFIFO);
960 }
961
962 static void rx_ready_async(MGSLPC_INFO *info, int tcd)
963 {
964         unsigned char data, status, flag;
965         int fifo_count;
966         int work = 0;
967         struct tty_struct *tty = info->tty;
968         struct mgsl_icount *icount = &info->icount;
969
970         if (tcd) {
971                 /* early termination, get FIFO count from RBCL register */
972                 fifo_count = (unsigned char)(read_reg(info, CHA+RBCL) & 0x1f);
973
974                 /* Zero fifo count could mean 0 or 32 bytes available.
975                  * If BIT5 of STAR is set then at least 1 byte is available.
976                  */
977                 if (!fifo_count && (read_reg(info,CHA+STAR) & BIT5))
978                         fifo_count = 32;
979         } else
980                 fifo_count = 32;
981
982         tty_buffer_request_room(tty, fifo_count);
983         /* Flush received async data to receive data buffer. */
984         while (fifo_count) {
985                 data   = read_reg(info, CHA + RXFIFO);
986                 status = read_reg(info, CHA + RXFIFO);
987                 fifo_count -= 2;
988
989                 icount->rx++;
990                 flag = TTY_NORMAL;
991
992                 // if no frameing/crc error then save data
993                 // BIT7:parity error
994                 // BIT6:framing error
995
996                 if (status & (BIT7 + BIT6)) {
997                         if (status & BIT7)
998                                 icount->parity++;
999                         else
1000                                 icount->frame++;
1001
1002                         /* discard char if tty control flags say so */
1003                         if (status & info->ignore_status_mask)
1004                                 continue;
1005
1006                         status &= info->read_status_mask;
1007
1008                         if (status & BIT7)
1009                                 flag = TTY_PARITY;
1010                         else if (status & BIT6)
1011                                 flag = TTY_FRAME;
1012                 }
1013                 work += tty_insert_flip_char(tty, data, flag);
1014         }
1015         issue_command(info, CHA, CMD_RXFIFO);
1016
1017         if (debug_level >= DEBUG_LEVEL_ISR) {
1018                 printk("%s(%d):rx_ready_async",
1019                         __FILE__,__LINE__);
1020                 printk("%s(%d):rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
1021                         __FILE__,__LINE__,icount->rx,icount->brk,
1022                         icount->parity,icount->frame,icount->overrun);
1023         }
1024
1025         if (work)
1026                 tty_flip_buffer_push(tty);
1027 }
1028
1029
1030 static void tx_done(MGSLPC_INFO *info)
1031 {
1032         if (!info->tx_active)
1033                 return;
1034
1035         info->tx_active = 0;
1036         info->tx_aborting = 0;
1037
1038         if (info->params.mode == MGSL_MODE_ASYNC)
1039                 return;
1040
1041         info->tx_count = info->tx_put = info->tx_get = 0;
1042         del_timer(&info->tx_timer);
1043
1044         if (info->drop_rts_on_tx_done) {
1045                 get_signals(info);
1046                 if (info->serial_signals & SerialSignal_RTS) {
1047                         info->serial_signals &= ~SerialSignal_RTS;
1048                         set_signals(info);
1049                 }
1050                 info->drop_rts_on_tx_done = 0;
1051         }
1052
1053 #if SYNCLINK_GENERIC_HDLC
1054         if (info->netcount)
1055                 hdlcdev_tx_done(info);
1056         else
1057 #endif
1058         {
1059                 if (info->tty->stopped || info->tty->hw_stopped) {
1060                         tx_stop(info);
1061                         return;
1062                 }
1063                 info->pending_bh |= BH_TRANSMIT;
1064         }
1065 }
1066
1067 static void tx_ready(MGSLPC_INFO *info)
1068 {
1069         unsigned char fifo_count = 32;
1070         int c;
1071
1072         if (debug_level >= DEBUG_LEVEL_ISR)
1073                 printk("%s(%d):tx_ready(%s)\n", __FILE__,__LINE__,info->device_name);
1074
1075         if (info->params.mode == MGSL_MODE_HDLC) {
1076                 if (!info->tx_active)
1077                         return;
1078         } else {
1079                 if (info->tty->stopped || info->tty->hw_stopped) {
1080                         tx_stop(info);
1081                         return;
1082                 }
1083                 if (!info->tx_count)
1084                         info->tx_active = 0;
1085         }
1086
1087         if (!info->tx_count)
1088                 return;
1089
1090         while (info->tx_count && fifo_count) {
1091                 c = min(2, min_t(int, fifo_count, min(info->tx_count, TXBUFSIZE - info->tx_get)));
1092
1093                 if (c == 1) {
1094                         write_reg(info, CHA + TXFIFO, *(info->tx_buf + info->tx_get));
1095                 } else {
1096                         write_reg16(info, CHA + TXFIFO,
1097                                           *((unsigned short*)(info->tx_buf + info->tx_get)));
1098                 }
1099                 info->tx_count -= c;
1100                 info->tx_get = (info->tx_get + c) & (TXBUFSIZE - 1);
1101                 fifo_count -= c;
1102         }
1103
1104         if (info->params.mode == MGSL_MODE_ASYNC) {
1105                 if (info->tx_count < WAKEUP_CHARS)
1106                         info->pending_bh |= BH_TRANSMIT;
1107                 issue_command(info, CHA, CMD_TXFIFO);
1108         } else {
1109                 if (info->tx_count)
1110                         issue_command(info, CHA, CMD_TXFIFO);
1111                 else
1112                         issue_command(info, CHA, CMD_TXFIFO + CMD_TXEOM);
1113         }
1114 }
1115
1116 static void cts_change(MGSLPC_INFO *info)
1117 {
1118         get_signals(info);
1119         if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1120                 irq_disable(info, CHB, IRQ_CTS);
1121         info->icount.cts++;
1122         if (info->serial_signals & SerialSignal_CTS)
1123                 info->input_signal_events.cts_up++;
1124         else
1125                 info->input_signal_events.cts_down++;
1126         wake_up_interruptible(&info->status_event_wait_q);
1127         wake_up_interruptible(&info->event_wait_q);
1128
1129         if (info->flags & ASYNC_CTS_FLOW) {
1130                 if (info->tty->hw_stopped) {
1131                         if (info->serial_signals & SerialSignal_CTS) {
1132                                 if (debug_level >= DEBUG_LEVEL_ISR)
1133                                         printk("CTS tx start...");
1134                                 if (info->tty)
1135                                         info->tty->hw_stopped = 0;
1136                                 tx_start(info);
1137                                 info->pending_bh |= BH_TRANSMIT;
1138                                 return;
1139                         }
1140                 } else {
1141                         if (!(info->serial_signals & SerialSignal_CTS)) {
1142                                 if (debug_level >= DEBUG_LEVEL_ISR)
1143                                         printk("CTS tx stop...");
1144                                 if (info->tty)
1145                                         info->tty->hw_stopped = 1;
1146                                 tx_stop(info);
1147                         }
1148                 }
1149         }
1150         info->pending_bh |= BH_STATUS;
1151 }
1152
1153 static void dcd_change(MGSLPC_INFO *info)
1154 {
1155         get_signals(info);
1156         if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1157                 irq_disable(info, CHB, IRQ_DCD);
1158         info->icount.dcd++;
1159         if (info->serial_signals & SerialSignal_DCD) {
1160                 info->input_signal_events.dcd_up++;
1161         }
1162         else
1163                 info->input_signal_events.dcd_down++;
1164 #if SYNCLINK_GENERIC_HDLC
1165         if (info->netcount) {
1166                 if (info->serial_signals & SerialSignal_DCD)
1167                         netif_carrier_on(info->netdev);
1168                 else
1169                         netif_carrier_off(info->netdev);
1170         }
1171 #endif
1172         wake_up_interruptible(&info->status_event_wait_q);
1173         wake_up_interruptible(&info->event_wait_q);
1174
1175         if (info->flags & ASYNC_CHECK_CD) {
1176                 if (debug_level >= DEBUG_LEVEL_ISR)
1177                         printk("%s CD now %s...", info->device_name,
1178                                (info->serial_signals & SerialSignal_DCD) ? "on" : "off");
1179                 if (info->serial_signals & SerialSignal_DCD)
1180                         wake_up_interruptible(&info->open_wait);
1181                 else {
1182                         if (debug_level >= DEBUG_LEVEL_ISR)
1183                                 printk("doing serial hangup...");
1184                         if (info->tty)
1185                                 tty_hangup(info->tty);
1186                 }
1187         }
1188         info->pending_bh |= BH_STATUS;
1189 }
1190
1191 static void dsr_change(MGSLPC_INFO *info)
1192 {
1193         get_signals(info);
1194         if ((info->dsr_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1195                 port_irq_disable(info, PVR_DSR);
1196         info->icount.dsr++;
1197         if (info->serial_signals & SerialSignal_DSR)
1198                 info->input_signal_events.dsr_up++;
1199         else
1200                 info->input_signal_events.dsr_down++;
1201         wake_up_interruptible(&info->status_event_wait_q);
1202         wake_up_interruptible(&info->event_wait_q);
1203         info->pending_bh |= BH_STATUS;
1204 }
1205
1206 static void ri_change(MGSLPC_INFO *info)
1207 {
1208         get_signals(info);
1209         if ((info->ri_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1210                 port_irq_disable(info, PVR_RI);
1211         info->icount.rng++;
1212         if (info->serial_signals & SerialSignal_RI)
1213                 info->input_signal_events.ri_up++;
1214         else
1215                 info->input_signal_events.ri_down++;
1216         wake_up_interruptible(&info->status_event_wait_q);
1217         wake_up_interruptible(&info->event_wait_q);
1218         info->pending_bh |= BH_STATUS;
1219 }
1220
1221 /* Interrupt service routine entry point.
1222  *
1223  * Arguments:
1224  *
1225  * irq     interrupt number that caused interrupt
1226  * dev_id  device ID supplied during interrupt registration
1227  */
1228 static irqreturn_t mgslpc_isr(int dummy, void *dev_id)
1229 {
1230         MGSLPC_INFO *info = dev_id;
1231         unsigned short isr;
1232         unsigned char gis, pis;
1233         int count=0;
1234
1235         if (debug_level >= DEBUG_LEVEL_ISR)
1236                 printk("mgslpc_isr(%d) entry.\n", info->irq_level);
1237
1238         if (!(info->p_dev->_locked))
1239                 return IRQ_HANDLED;
1240
1241         spin_lock(&info->lock);
1242
1243         while ((gis = read_reg(info, CHA + GIS))) {
1244                 if (debug_level >= DEBUG_LEVEL_ISR)
1245                         printk("mgslpc_isr %s gis=%04X\n", info->device_name,gis);
1246
1247                 if ((gis & 0x70) || count > 1000) {
1248                         printk("synclink_cs:hardware failed or ejected\n");
1249                         break;
1250                 }
1251                 count++;
1252
1253                 if (gis & (BIT1 + BIT0)) {
1254                         isr = read_reg16(info, CHB + ISR);
1255                         if (isr & IRQ_DCD)
1256                                 dcd_change(info);
1257                         if (isr & IRQ_CTS)
1258                                 cts_change(info);
1259                 }
1260                 if (gis & (BIT3 + BIT2))
1261                 {
1262                         isr = read_reg16(info, CHA + ISR);
1263                         if (isr & IRQ_TIMER) {
1264                                 info->irq_occurred = 1;
1265                                 irq_disable(info, CHA, IRQ_TIMER);
1266                         }
1267
1268                         /* receive IRQs */
1269                         if (isr & IRQ_EXITHUNT) {
1270                                 info->icount.exithunt++;
1271                                 wake_up_interruptible(&info->event_wait_q);
1272                         }
1273                         if (isr & IRQ_BREAK_ON) {
1274                                 info->icount.brk++;
1275                                 if (info->flags & ASYNC_SAK)
1276                                         do_SAK(info->tty);
1277                         }
1278                         if (isr & IRQ_RXTIME) {
1279                                 issue_command(info, CHA, CMD_RXFIFO_READ);
1280                         }
1281                         if (isr & (IRQ_RXEOM + IRQ_RXFIFO)) {
1282                                 if (info->params.mode == MGSL_MODE_HDLC)
1283                                         rx_ready_hdlc(info, isr & IRQ_RXEOM);
1284                                 else
1285                                         rx_ready_async(info, isr & IRQ_RXEOM);
1286                         }
1287
1288                         /* transmit IRQs */
1289                         if (isr & IRQ_UNDERRUN) {
1290                                 if (info->tx_aborting)
1291                                         info->icount.txabort++;
1292                                 else
1293                                         info->icount.txunder++;
1294                                 tx_done(info);
1295                         }
1296                         else if (isr & IRQ_ALLSENT) {
1297                                 info->icount.txok++;
1298                                 tx_done(info);
1299                         }
1300                         else if (isr & IRQ_TXFIFO)
1301                                 tx_ready(info);
1302                 }
1303                 if (gis & BIT7) {
1304                         pis = read_reg(info, CHA + PIS);
1305                         if (pis & BIT1)
1306                                 dsr_change(info);
1307                         if (pis & BIT2)
1308                                 ri_change(info);
1309                 }
1310         }
1311
1312         /* Request bottom half processing if there's something
1313          * for it to do and the bh is not already running
1314          */
1315
1316         if (info->pending_bh && !info->bh_running && !info->bh_requested) {
1317                 if ( debug_level >= DEBUG_LEVEL_ISR )
1318                         printk("%s(%d):%s queueing bh task.\n",
1319                                 __FILE__,__LINE__,info->device_name);
1320                 schedule_work(&info->task);
1321                 info->bh_requested = 1;
1322         }
1323
1324         spin_unlock(&info->lock);
1325
1326         if (debug_level >= DEBUG_LEVEL_ISR)
1327                 printk("%s(%d):mgslpc_isr(%d)exit.\n",
1328                        __FILE__, __LINE__, info->irq_level);
1329
1330         return IRQ_HANDLED;
1331 }
1332
1333 /* Initialize and start device.
1334  */
1335 static int startup(MGSLPC_INFO * info)
1336 {
1337         int retval = 0;
1338
1339         if (debug_level >= DEBUG_LEVEL_INFO)
1340                 printk("%s(%d):startup(%s)\n",__FILE__,__LINE__,info->device_name);
1341
1342         if (info->flags & ASYNC_INITIALIZED)
1343                 return 0;
1344
1345         if (!info->tx_buf) {
1346                 /* allocate a page of memory for a transmit buffer */
1347                 info->tx_buf = (unsigned char *)get_zeroed_page(GFP_KERNEL);
1348                 if (!info->tx_buf) {
1349                         printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
1350                                 __FILE__,__LINE__,info->device_name);
1351                         return -ENOMEM;
1352                 }
1353         }
1354
1355         info->pending_bh = 0;
1356
1357         memset(&info->icount, 0, sizeof(info->icount));
1358
1359         setup_timer(&info->tx_timer, tx_timeout, (unsigned long)info);
1360
1361         /* Allocate and claim adapter resources */
1362         retval = claim_resources(info);
1363
1364         /* perform existance check and diagnostics */
1365         if ( !retval )
1366                 retval = adapter_test(info);
1367
1368         if ( retval ) {
1369                 if (capable(CAP_SYS_ADMIN) && info->tty)
1370                         set_bit(TTY_IO_ERROR, &info->tty->flags);
1371                 release_resources(info);
1372                 return retval;
1373         }
1374
1375         /* program hardware for current parameters */
1376         mgslpc_change_params(info);
1377
1378         if (info->tty)
1379                 clear_bit(TTY_IO_ERROR, &info->tty->flags);
1380
1381         info->flags |= ASYNC_INITIALIZED;
1382
1383         return 0;
1384 }
1385
1386 /* Called by mgslpc_close() and mgslpc_hangup() to shutdown hardware
1387  */
1388 static void shutdown(MGSLPC_INFO * info)
1389 {
1390         unsigned long flags;
1391
1392         if (!(info->flags & ASYNC_INITIALIZED))
1393                 return;
1394
1395         if (debug_level >= DEBUG_LEVEL_INFO)
1396                 printk("%s(%d):mgslpc_shutdown(%s)\n",
1397                          __FILE__,__LINE__, info->device_name );
1398
1399         /* clear status wait queue because status changes */
1400         /* can't happen after shutting down the hardware */
1401         wake_up_interruptible(&info->status_event_wait_q);
1402         wake_up_interruptible(&info->event_wait_q);
1403
1404         del_timer_sync(&info->tx_timer);
1405
1406         if (info->tx_buf) {
1407                 free_page((unsigned long) info->tx_buf);
1408                 info->tx_buf = NULL;
1409         }
1410
1411         spin_lock_irqsave(&info->lock,flags);
1412
1413         rx_stop(info);
1414         tx_stop(info);
1415
1416         /* TODO:disable interrupts instead of reset to preserve signal states */
1417         reset_device(info);
1418
1419         if (!info->tty || info->tty->termios->c_cflag & HUPCL) {
1420                 info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
1421                 set_signals(info);
1422         }
1423
1424         spin_unlock_irqrestore(&info->lock,flags);
1425
1426         release_resources(info);
1427
1428         if (info->tty)
1429                 set_bit(TTY_IO_ERROR, &info->tty->flags);
1430
1431         info->flags &= ~ASYNC_INITIALIZED;
1432 }
1433
1434 static void mgslpc_program_hw(MGSLPC_INFO *info)
1435 {
1436         unsigned long flags;
1437
1438         spin_lock_irqsave(&info->lock,flags);
1439
1440         rx_stop(info);
1441         tx_stop(info);
1442         info->tx_count = info->tx_put = info->tx_get = 0;
1443
1444         if (info->params.mode == MGSL_MODE_HDLC || info->netcount)
1445                 hdlc_mode(info);
1446         else
1447                 async_mode(info);
1448
1449         set_signals(info);
1450
1451         info->dcd_chkcount = 0;
1452         info->cts_chkcount = 0;
1453         info->ri_chkcount = 0;
1454         info->dsr_chkcount = 0;
1455
1456         irq_enable(info, CHB, IRQ_DCD | IRQ_CTS);
1457         port_irq_enable(info, (unsigned char) PVR_DSR | PVR_RI);
1458         get_signals(info);
1459
1460         if (info->netcount || info->tty->termios->c_cflag & CREAD)
1461                 rx_start(info);
1462
1463         spin_unlock_irqrestore(&info->lock,flags);
1464 }
1465
1466 /* Reconfigure adapter based on new parameters
1467  */
1468 static void mgslpc_change_params(MGSLPC_INFO *info)
1469 {
1470         unsigned cflag;
1471         int bits_per_char;
1472
1473         if (!info->tty || !info->tty->termios)
1474                 return;
1475
1476         if (debug_level >= DEBUG_LEVEL_INFO)
1477                 printk("%s(%d):mgslpc_change_params(%s)\n",
1478                          __FILE__,__LINE__, info->device_name );
1479
1480         cflag = info->tty->termios->c_cflag;
1481
1482         /* if B0 rate (hangup) specified then negate DTR and RTS */
1483         /* otherwise assert DTR and RTS */
1484         if (cflag & CBAUD)
1485                 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
1486         else
1487                 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
1488
1489         /* byte size and parity */
1490
1491         switch (cflag & CSIZE) {
1492         case CS5: info->params.data_bits = 5; break;
1493         case CS6: info->params.data_bits = 6; break;
1494         case CS7: info->params.data_bits = 7; break;
1495         case CS8: info->params.data_bits = 8; break;
1496         default:  info->params.data_bits = 7; break;
1497         }
1498
1499         if (cflag & CSTOPB)
1500                 info->params.stop_bits = 2;
1501         else
1502                 info->params.stop_bits = 1;
1503
1504         info->params.parity = ASYNC_PARITY_NONE;
1505         if (cflag & PARENB) {
1506                 if (cflag & PARODD)
1507                         info->params.parity = ASYNC_PARITY_ODD;
1508                 else
1509                         info->params.parity = ASYNC_PARITY_EVEN;
1510 #ifdef CMSPAR
1511                 if (cflag & CMSPAR)
1512                         info->params.parity = ASYNC_PARITY_SPACE;
1513 #endif
1514         }
1515
1516         /* calculate number of jiffies to transmit a full
1517          * FIFO (32 bytes) at specified data rate
1518          */
1519         bits_per_char = info->params.data_bits +
1520                         info->params.stop_bits + 1;
1521
1522         /* if port data rate is set to 460800 or less then
1523          * allow tty settings to override, otherwise keep the
1524          * current data rate.
1525          */
1526         if (info->params.data_rate <= 460800) {
1527                 info->params.data_rate = tty_get_baud_rate(info->tty);
1528         }
1529
1530         if ( info->params.data_rate ) {
1531                 info->timeout = (32*HZ*bits_per_char) /
1532                                 info->params.data_rate;
1533         }
1534         info->timeout += HZ/50;         /* Add .02 seconds of slop */
1535
1536         if (cflag & CRTSCTS)
1537                 info->flags |= ASYNC_CTS_FLOW;
1538         else
1539                 info->flags &= ~ASYNC_CTS_FLOW;
1540
1541         if (cflag & CLOCAL)
1542                 info->flags &= ~ASYNC_CHECK_CD;
1543         else
1544                 info->flags |= ASYNC_CHECK_CD;
1545
1546         /* process tty input control flags */
1547
1548         info->read_status_mask = 0;
1549         if (I_INPCK(info->tty))
1550                 info->read_status_mask |= BIT7 | BIT6;
1551         if (I_IGNPAR(info->tty))
1552                 info->ignore_status_mask |= BIT7 | BIT6;
1553
1554         mgslpc_program_hw(info);
1555 }
1556
1557 /* Add a character to the transmit buffer
1558  */
1559 static void mgslpc_put_char(struct tty_struct *tty, unsigned char ch)
1560 {
1561         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1562         unsigned long flags;
1563
1564         if (debug_level >= DEBUG_LEVEL_INFO) {
1565                 printk( "%s(%d):mgslpc_put_char(%d) on %s\n",
1566                         __FILE__,__LINE__,ch,info->device_name);
1567         }
1568
1569         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_put_char"))
1570                 return;
1571
1572         if (!info->tx_buf)
1573                 return;
1574
1575         spin_lock_irqsave(&info->lock,flags);
1576
1577         if (info->params.mode == MGSL_MODE_ASYNC || !info->tx_active) {
1578                 if (info->tx_count < TXBUFSIZE - 1) {
1579                         info->tx_buf[info->tx_put++] = ch;
1580                         info->tx_put &= TXBUFSIZE-1;
1581                         info->tx_count++;
1582                 }
1583         }
1584
1585         spin_unlock_irqrestore(&info->lock,flags);
1586 }
1587
1588 /* Enable transmitter so remaining characters in the
1589  * transmit buffer are sent.
1590  */
1591 static void mgslpc_flush_chars(struct tty_struct *tty)
1592 {
1593         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1594         unsigned long flags;
1595
1596         if (debug_level >= DEBUG_LEVEL_INFO)
1597                 printk( "%s(%d):mgslpc_flush_chars() entry on %s tx_count=%d\n",
1598                         __FILE__,__LINE__,info->device_name,info->tx_count);
1599
1600         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_flush_chars"))
1601                 return;
1602
1603         if (info->tx_count <= 0 || tty->stopped ||
1604             tty->hw_stopped || !info->tx_buf)
1605                 return;
1606
1607         if (debug_level >= DEBUG_LEVEL_INFO)
1608                 printk( "%s(%d):mgslpc_flush_chars() entry on %s starting transmitter\n",
1609                         __FILE__,__LINE__,info->device_name);
1610
1611         spin_lock_irqsave(&info->lock,flags);
1612         if (!info->tx_active)
1613                 tx_start(info);
1614         spin_unlock_irqrestore(&info->lock,flags);
1615 }
1616
1617 /* Send a block of data
1618  *
1619  * Arguments:
1620  *
1621  * tty        pointer to tty information structure
1622  * buf        pointer to buffer containing send data
1623  * count      size of send data in bytes
1624  *
1625  * Returns: number of characters written
1626  */
1627 static int mgslpc_write(struct tty_struct * tty,
1628                         const unsigned char *buf, int count)
1629 {
1630         int c, ret = 0;
1631         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1632         unsigned long flags;
1633
1634         if (debug_level >= DEBUG_LEVEL_INFO)
1635                 printk( "%s(%d):mgslpc_write(%s) count=%d\n",
1636                         __FILE__,__LINE__,info->device_name,count);
1637
1638         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_write") ||
1639                 !info->tx_buf)
1640                 goto cleanup;
1641
1642         if (info->params.mode == MGSL_MODE_HDLC) {
1643                 if (count > TXBUFSIZE) {
1644                         ret = -EIO;
1645                         goto cleanup;
1646                 }
1647                 if (info->tx_active)
1648                         goto cleanup;
1649                 else if (info->tx_count)
1650                         goto start;
1651         }
1652
1653         for (;;) {
1654                 c = min(count,
1655                         min(TXBUFSIZE - info->tx_count - 1,
1656                             TXBUFSIZE - info->tx_put));
1657                 if (c <= 0)
1658                         break;
1659
1660                 memcpy(info->tx_buf + info->tx_put, buf, c);
1661
1662                 spin_lock_irqsave(&info->lock,flags);
1663                 info->tx_put = (info->tx_put + c) & (TXBUFSIZE-1);
1664                 info->tx_count += c;
1665                 spin_unlock_irqrestore(&info->lock,flags);
1666
1667                 buf += c;
1668                 count -= c;
1669                 ret += c;
1670         }
1671 start:
1672         if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
1673                 spin_lock_irqsave(&info->lock,flags);
1674                 if (!info->tx_active)
1675                         tx_start(info);
1676                 spin_unlock_irqrestore(&info->lock,flags);
1677         }
1678 cleanup:
1679         if (debug_level >= DEBUG_LEVEL_INFO)
1680                 printk( "%s(%d):mgslpc_write(%s) returning=%d\n",
1681                         __FILE__,__LINE__,info->device_name,ret);
1682         return ret;
1683 }
1684
1685 /* Return the count of free bytes in transmit buffer
1686  */
1687 static int mgslpc_write_room(struct tty_struct *tty)
1688 {
1689         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1690         int ret;
1691
1692         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_write_room"))
1693                 return 0;
1694
1695         if (info->params.mode == MGSL_MODE_HDLC) {
1696                 /* HDLC (frame oriented) mode */
1697                 if (info->tx_active)
1698                         return 0;
1699                 else
1700                         return HDLC_MAX_FRAME_SIZE;
1701         } else {
1702                 ret = TXBUFSIZE - info->tx_count - 1;
1703                 if (ret < 0)
1704                         ret = 0;
1705         }
1706
1707         if (debug_level >= DEBUG_LEVEL_INFO)
1708                 printk("%s(%d):mgslpc_write_room(%s)=%d\n",
1709                          __FILE__,__LINE__, info->device_name, ret);
1710         return ret;
1711 }
1712
1713 /* Return the count of bytes in transmit buffer
1714  */
1715 static int mgslpc_chars_in_buffer(struct tty_struct *tty)
1716 {
1717         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1718         int rc;
1719
1720         if (debug_level >= DEBUG_LEVEL_INFO)
1721                 printk("%s(%d):mgslpc_chars_in_buffer(%s)\n",
1722                          __FILE__,__LINE__, info->device_name );
1723
1724         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_chars_in_buffer"))
1725                 return 0;
1726
1727         if (info->params.mode == MGSL_MODE_HDLC)
1728                 rc = info->tx_active ? info->max_frame_size : 0;
1729         else
1730                 rc = info->tx_count;
1731
1732         if (debug_level >= DEBUG_LEVEL_INFO)
1733                 printk("%s(%d):mgslpc_chars_in_buffer(%s)=%d\n",
1734                          __FILE__,__LINE__, info->device_name, rc);
1735
1736         return rc;
1737 }
1738
1739 /* Discard all data in the send buffer
1740  */
1741 static void mgslpc_flush_buffer(struct tty_struct *tty)
1742 {
1743         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1744         unsigned long flags;
1745
1746         if (debug_level >= DEBUG_LEVEL_INFO)
1747                 printk("%s(%d):mgslpc_flush_buffer(%s) entry\n",
1748                          __FILE__,__LINE__, info->device_name );
1749
1750         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_flush_buffer"))
1751                 return;
1752
1753         spin_lock_irqsave(&info->lock,flags);
1754         info->tx_count = info->tx_put = info->tx_get = 0;
1755         del_timer(&info->tx_timer);
1756         spin_unlock_irqrestore(&info->lock,flags);
1757
1758         wake_up_interruptible(&tty->write_wait);
1759         tty_wakeup(tty);
1760 }
1761
1762 /* Send a high-priority XON/XOFF character
1763  */
1764 static void mgslpc_send_xchar(struct tty_struct *tty, char ch)
1765 {
1766         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1767         unsigned long flags;
1768
1769         if (debug_level >= DEBUG_LEVEL_INFO)
1770                 printk("%s(%d):mgslpc_send_xchar(%s,%d)\n",
1771                          __FILE__,__LINE__, info->device_name, ch );
1772
1773         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_send_xchar"))
1774                 return;
1775
1776         info->x_char = ch;
1777         if (ch) {
1778                 spin_lock_irqsave(&info->lock,flags);
1779                 if (!info->tx_enabled)
1780                         tx_start(info);
1781                 spin_unlock_irqrestore(&info->lock,flags);
1782         }
1783 }
1784
1785 /* Signal remote device to throttle send data (our receive data)
1786  */
1787 static void mgslpc_throttle(struct tty_struct * tty)
1788 {
1789         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1790         unsigned long flags;
1791
1792         if (debug_level >= DEBUG_LEVEL_INFO)
1793                 printk("%s(%d):mgslpc_throttle(%s) entry\n",
1794                          __FILE__,__LINE__, info->device_name );
1795
1796         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_throttle"))
1797                 return;
1798
1799         if (I_IXOFF(tty))
1800                 mgslpc_send_xchar(tty, STOP_CHAR(tty));
1801
1802         if (tty->termios->c_cflag & CRTSCTS) {
1803                 spin_lock_irqsave(&info->lock,flags);
1804                 info->serial_signals &= ~SerialSignal_RTS;
1805                 set_signals(info);
1806                 spin_unlock_irqrestore(&info->lock,flags);
1807         }
1808 }
1809
1810 /* Signal remote device to stop throttling send data (our receive data)
1811  */
1812 static void mgslpc_unthrottle(struct tty_struct * tty)
1813 {
1814         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1815         unsigned long flags;
1816
1817         if (debug_level >= DEBUG_LEVEL_INFO)
1818                 printk("%s(%d):mgslpc_unthrottle(%s) entry\n",
1819                          __FILE__,__LINE__, info->device_name );
1820
1821         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_unthrottle"))
1822                 return;
1823
1824         if (I_IXOFF(tty)) {
1825                 if (info->x_char)
1826                         info->x_char = 0;
1827                 else
1828                         mgslpc_send_xchar(tty, START_CHAR(tty));
1829         }
1830
1831         if (tty->termios->c_cflag & CRTSCTS) {
1832                 spin_lock_irqsave(&info->lock,flags);
1833                 info->serial_signals |= SerialSignal_RTS;
1834                 set_signals(info);
1835                 spin_unlock_irqrestore(&info->lock,flags);
1836         }
1837 }
1838
1839 /* get the current serial statistics
1840  */
1841 static int get_stats(MGSLPC_INFO * info, struct mgsl_icount __user *user_icount)
1842 {
1843         int err;
1844         if (debug_level >= DEBUG_LEVEL_INFO)
1845                 printk("get_params(%s)\n", info->device_name);
1846         if (!user_icount) {
1847                 memset(&info->icount, 0, sizeof(info->icount));
1848         } else {
1849                 COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
1850                 if (err)
1851                         return -EFAULT;
1852         }
1853         return 0;
1854 }
1855
1856 /* get the current serial parameters
1857  */
1858 static int get_params(MGSLPC_INFO * info, MGSL_PARAMS __user *user_params)
1859 {
1860         int err;
1861         if (debug_level >= DEBUG_LEVEL_INFO)
1862                 printk("get_params(%s)\n", info->device_name);
1863         COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
1864         if (err)
1865                 return -EFAULT;
1866         return 0;
1867 }
1868
1869 /* set the serial parameters
1870  *
1871  * Arguments:
1872  *
1873  *      info            pointer to device instance data
1874  *      new_params      user buffer containing new serial params
1875  *
1876  * Returns:     0 if success, otherwise error code
1877  */
1878 static int set_params(MGSLPC_INFO * info, MGSL_PARAMS __user *new_params)
1879 {
1880         unsigned long flags;
1881         MGSL_PARAMS tmp_params;
1882         int err;
1883
1884         if (debug_level >= DEBUG_LEVEL_INFO)
1885                 printk("%s(%d):set_params %s\n", __FILE__,__LINE__,
1886                         info->device_name );
1887         COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
1888         if (err) {
1889                 if ( debug_level >= DEBUG_LEVEL_INFO )
1890                         printk( "%s(%d):set_params(%s) user buffer copy failed\n",
1891                                 __FILE__,__LINE__,info->device_name);
1892                 return -EFAULT;
1893         }
1894
1895         spin_lock_irqsave(&info->lock,flags);
1896         memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
1897         spin_unlock_irqrestore(&info->lock,flags);
1898
1899         mgslpc_change_params(info);
1900
1901         return 0;
1902 }
1903
1904 static int get_txidle(MGSLPC_INFO * info, int __user *idle_mode)
1905 {
1906         int err;
1907         if (debug_level >= DEBUG_LEVEL_INFO)
1908                 printk("get_txidle(%s)=%d\n", info->device_name, info->idle_mode);
1909         COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
1910         if (err)
1911                 return -EFAULT;
1912         return 0;
1913 }
1914
1915 static int set_txidle(MGSLPC_INFO * info, int idle_mode)
1916 {
1917         unsigned long flags;
1918         if (debug_level >= DEBUG_LEVEL_INFO)
1919                 printk("set_txidle(%s,%d)\n", info->device_name, idle_mode);
1920         spin_lock_irqsave(&info->lock,flags);
1921         info->idle_mode = idle_mode;
1922         tx_set_idle(info);
1923         spin_unlock_irqrestore(&info->lock,flags);
1924         return 0;
1925 }
1926
1927 static int get_interface(MGSLPC_INFO * info, int __user *if_mode)
1928 {
1929         int err;
1930         if (debug_level >= DEBUG_LEVEL_INFO)
1931                 printk("get_interface(%s)=%d\n", info->device_name, info->if_mode);
1932         COPY_TO_USER(err,if_mode, &info->if_mode, sizeof(int));
1933         if (err)
1934                 return -EFAULT;
1935         return 0;
1936 }
1937
1938 static int set_interface(MGSLPC_INFO * info, int if_mode)
1939 {
1940         unsigned long flags;
1941         unsigned char val;
1942         if (debug_level >= DEBUG_LEVEL_INFO)
1943                 printk("set_interface(%s,%d)\n", info->device_name, if_mode);
1944         spin_lock_irqsave(&info->lock,flags);
1945         info->if_mode = if_mode;
1946
1947         val = read_reg(info, PVR) & 0x0f;
1948         switch (info->if_mode)
1949         {
1950         case MGSL_INTERFACE_RS232: val |= PVR_RS232; break;
1951         case MGSL_INTERFACE_V35:   val |= PVR_V35;   break;
1952         case MGSL_INTERFACE_RS422: val |= PVR_RS422; break;
1953         }
1954         write_reg(info, PVR, val);
1955
1956         spin_unlock_irqrestore(&info->lock,flags);
1957         return 0;
1958 }
1959
1960 static int set_txenable(MGSLPC_INFO * info, int enable)
1961 {
1962         unsigned long flags;
1963
1964         if (debug_level >= DEBUG_LEVEL_INFO)
1965                 printk("set_txenable(%s,%d)\n", info->device_name, enable);
1966
1967         spin_lock_irqsave(&info->lock,flags);
1968         if (enable) {
1969                 if (!info->tx_enabled)
1970                         tx_start(info);
1971         } else {
1972                 if (info->tx_enabled)
1973                         tx_stop(info);
1974         }
1975         spin_unlock_irqrestore(&info->lock,flags);
1976         return 0;
1977 }
1978
1979 static int tx_abort(MGSLPC_INFO * info)
1980 {
1981         unsigned long flags;
1982
1983         if (debug_level >= DEBUG_LEVEL_INFO)
1984                 printk("tx_abort(%s)\n", info->device_name);
1985
1986         spin_lock_irqsave(&info->lock,flags);
1987         if (info->tx_active && info->tx_count &&
1988             info->params.mode == MGSL_MODE_HDLC) {
1989                 /* clear data count so FIFO is not filled on next IRQ.
1990                  * This results in underrun and abort transmission.
1991                  */
1992                 info->tx_count = info->tx_put = info->tx_get = 0;
1993                 info->tx_aborting = TRUE;
1994         }
1995         spin_unlock_irqrestore(&info->lock,flags);
1996         return 0;
1997 }
1998
1999 static int set_rxenable(MGSLPC_INFO * info, int enable)
2000 {
2001         unsigned long flags;
2002
2003         if (debug_level >= DEBUG_LEVEL_INFO)
2004                 printk("set_rxenable(%s,%d)\n", info->device_name, enable);
2005
2006         spin_lock_irqsave(&info->lock,flags);
2007         if (enable) {
2008                 if (!info->rx_enabled)
2009                         rx_start(info);
2010         } else {
2011                 if (info->rx_enabled)
2012                         rx_stop(info);
2013         }
2014         spin_unlock_irqrestore(&info->lock,flags);
2015         return 0;
2016 }
2017
2018 /* wait for specified event to occur
2019  *
2020  * Arguments:           info    pointer to device instance data
2021  *                      mask    pointer to bitmask of events to wait for
2022  * Return Value:        0       if successful and bit mask updated with
2023  *                              of events triggerred,
2024  *                      otherwise error code
2025  */
2026 static int wait_events(MGSLPC_INFO * info, int __user *mask_ptr)
2027 {
2028         unsigned long flags;
2029         int s;
2030         int rc=0;
2031         struct mgsl_icount cprev, cnow;
2032         int events;
2033         int mask;
2034         struct  _input_signal_events oldsigs, newsigs;
2035         DECLARE_WAITQUEUE(wait, current);
2036
2037         COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
2038         if (rc)
2039                 return  -EFAULT;
2040
2041         if (debug_level >= DEBUG_LEVEL_INFO)
2042                 printk("wait_events(%s,%d)\n", info->device_name, mask);
2043
2044         spin_lock_irqsave(&info->lock,flags);
2045
2046         /* return immediately if state matches requested events */
2047         get_signals(info);
2048         s = info->serial_signals;
2049         events = mask &
2050                 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
2051                   ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
2052                   ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
2053                   ((s & SerialSignal_RI)  ? MgslEvent_RiActive :MgslEvent_RiInactive) );
2054         if (events) {
2055                 spin_unlock_irqrestore(&info->lock,flags);
2056                 goto exit;
2057         }
2058
2059         /* save current irq counts */
2060         cprev = info->icount;
2061         oldsigs = info->input_signal_events;
2062
2063         if ((info->params.mode == MGSL_MODE_HDLC) &&
2064             (mask & MgslEvent_ExitHuntMode))
2065                 irq_enable(info, CHA, IRQ_EXITHUNT);
2066
2067         set_current_state(TASK_INTERRUPTIBLE);
2068         add_wait_queue(&info->event_wait_q, &wait);
2069
2070         spin_unlock_irqrestore(&info->lock,flags);
2071
2072
2073         for(;;) {
2074                 schedule();
2075                 if (signal_pending(current)) {
2076                         rc = -ERESTARTSYS;
2077                         break;
2078                 }
2079
2080                 /* get current irq counts */
2081                 spin_lock_irqsave(&info->lock,flags);
2082                 cnow = info->icount;
2083                 newsigs = info->input_signal_events;
2084                 set_current_state(TASK_INTERRUPTIBLE);
2085                 spin_unlock_irqrestore(&info->lock,flags);
2086
2087                 /* if no change, wait aborted for some reason */
2088                 if (newsigs.dsr_up   == oldsigs.dsr_up   &&
2089                     newsigs.dsr_down == oldsigs.dsr_down &&
2090                     newsigs.dcd_up   == oldsigs.dcd_up   &&
2091                     newsigs.dcd_down == oldsigs.dcd_down &&
2092                     newsigs.cts_up   == oldsigs.cts_up   &&
2093                     newsigs.cts_down == oldsigs.cts_down &&
2094                     newsigs.ri_up    == oldsigs.ri_up    &&
2095                     newsigs.ri_down  == oldsigs.ri_down  &&
2096                     cnow.exithunt    == cprev.exithunt   &&
2097                     cnow.rxidle      == cprev.rxidle) {
2098                         rc = -EIO;
2099                         break;
2100                 }
2101
2102                 events = mask &
2103                         ( (newsigs.dsr_up   != oldsigs.dsr_up   ? MgslEvent_DsrActive:0)   +
2104                           (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
2105                           (newsigs.dcd_up   != oldsigs.dcd_up   ? MgslEvent_DcdActive:0)   +
2106                           (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
2107                           (newsigs.cts_up   != oldsigs.cts_up   ? MgslEvent_CtsActive:0)   +
2108                           (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
2109                           (newsigs.ri_up    != oldsigs.ri_up    ? MgslEvent_RiActive:0)    +
2110                           (newsigs.ri_down  != oldsigs.ri_down  ? MgslEvent_RiInactive:0)  +
2111                           (cnow.exithunt    != cprev.exithunt   ? MgslEvent_ExitHuntMode:0) +
2112                           (cnow.rxidle      != cprev.rxidle     ? MgslEvent_IdleReceived:0) );
2113                 if (events)
2114                         break;
2115
2116                 cprev = cnow;
2117                 oldsigs = newsigs;
2118         }
2119
2120         remove_wait_queue(&info->event_wait_q, &wait);
2121         set_current_state(TASK_RUNNING);
2122
2123         if (mask & MgslEvent_ExitHuntMode) {
2124                 spin_lock_irqsave(&info->lock,flags);
2125                 if (!waitqueue_active(&info->event_wait_q))
2126                         irq_disable(info, CHA, IRQ_EXITHUNT);
2127                 spin_unlock_irqrestore(&info->lock,flags);
2128         }
2129 exit:
2130         if (rc == 0)
2131                 PUT_USER(rc, events, mask_ptr);
2132         return rc;
2133 }
2134
2135 static int modem_input_wait(MGSLPC_INFO *info,int arg)
2136 {
2137         unsigned long flags;
2138         int rc;
2139         struct mgsl_icount cprev, cnow;
2140         DECLARE_WAITQUEUE(wait, current);
2141
2142         /* save current irq counts */
2143         spin_lock_irqsave(&info->lock,flags);
2144         cprev = info->icount;
2145         add_wait_queue(&info->status_event_wait_q, &wait);
2146         set_current_state(TASK_INTERRUPTIBLE);
2147         spin_unlock_irqrestore(&info->lock,flags);
2148
2149         for(;;) {
2150                 schedule();
2151                 if (signal_pending(current)) {
2152                         rc = -ERESTARTSYS;
2153                         break;
2154                 }
2155
2156                 /* get new irq counts */
2157                 spin_lock_irqsave(&info->lock,flags);
2158                 cnow = info->icount;
2159                 set_current_state(TASK_INTERRUPTIBLE);
2160                 spin_unlock_irqrestore(&info->lock,flags);
2161
2162                 /* if no change, wait aborted for some reason */
2163                 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2164                     cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
2165                         rc = -EIO;
2166                         break;
2167                 }
2168
2169                 /* check for change in caller specified modem input */
2170                 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
2171                     (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
2172                     (arg & TIOCM_CD  && cnow.dcd != cprev.dcd) ||
2173                     (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
2174                         rc = 0;
2175                         break;
2176                 }
2177
2178                 cprev = cnow;
2179         }
2180         remove_wait_queue(&info->status_event_wait_q, &wait);
2181         set_current_state(TASK_RUNNING);
2182         return rc;
2183 }
2184
2185 /* return the state of the serial control and status signals
2186  */
2187 static int tiocmget(struct tty_struct *tty, struct file *file)
2188 {
2189         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
2190         unsigned int result;
2191         unsigned long flags;
2192
2193         spin_lock_irqsave(&info->lock,flags);
2194         get_signals(info);
2195         spin_unlock_irqrestore(&info->lock,flags);
2196
2197         result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
2198                 ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
2199                 ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
2200                 ((info->serial_signals & SerialSignal_RI)  ? TIOCM_RNG:0) +
2201                 ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
2202                 ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS:0);
2203
2204         if (debug_level >= DEBUG_LEVEL_INFO)
2205                 printk("%s(%d):%s tiocmget() value=%08X\n",
2206                          __FILE__,__LINE__, info->device_name, result );
2207         return result;
2208 }
2209
2210 /* set modem control signals (DTR/RTS)
2211  */
2212 static int tiocmset(struct tty_struct *tty, struct file *file,
2213                     unsigned int set, unsigned int clear)
2214 {
2215         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
2216         unsigned long flags;
2217
2218         if (debug_level >= DEBUG_LEVEL_INFO)
2219                 printk("%s(%d):%s tiocmset(%x,%x)\n",
2220                         __FILE__,__LINE__,info->device_name, set, clear);
2221
2222         if (set & TIOCM_RTS)
2223                 info->serial_signals |= SerialSignal_RTS;
2224         if (set & TIOCM_DTR)
2225                 info->serial_signals |= SerialSignal_DTR;
2226         if (clear & TIOCM_RTS)
2227                 info->serial_signals &= ~SerialSignal_RTS;
2228         if (clear & TIOCM_DTR)
2229                 info->serial_signals &= ~SerialSignal_DTR;
2230
2231         spin_lock_irqsave(&info->lock,flags);
2232         set_signals(info);
2233         spin_unlock_irqrestore(&info->lock,flags);
2234
2235         return 0;
2236 }
2237
2238 /* Set or clear transmit break condition
2239  *
2240  * Arguments:           tty             pointer to tty instance data
2241  *                      break_state     -1=set break condition, 0=clear
2242  */
2243 static void mgslpc_break(struct tty_struct *tty, int break_state)
2244 {
2245         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2246         unsigned long flags;
2247
2248         if (debug_level >= DEBUG_LEVEL_INFO)
2249                 printk("%s(%d):mgslpc_break(%s,%d)\n",
2250                          __FILE__,__LINE__, info->device_name, break_state);
2251
2252         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_break"))
2253                 return;
2254
2255         spin_lock_irqsave(&info->lock,flags);
2256         if (break_state == -1)
2257                 set_reg_bits(info, CHA+DAFO, BIT6);
2258         else
2259                 clear_reg_bits(info, CHA+DAFO, BIT6);
2260         spin_unlock_irqrestore(&info->lock,flags);
2261 }
2262
2263 /* Service an IOCTL request
2264  *
2265  * Arguments:
2266  *
2267  *      tty     pointer to tty instance data
2268  *      file    pointer to associated file object for device
2269  *      cmd     IOCTL command code
2270  *      arg     command argument/context
2271  *
2272  * Return Value:        0 if success, otherwise error code
2273  */
2274 static int mgslpc_ioctl(struct tty_struct *tty, struct file * file,
2275                         unsigned int cmd, unsigned long arg)
2276 {
2277         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2278
2279         if (debug_level >= DEBUG_LEVEL_INFO)
2280                 printk("%s(%d):mgslpc_ioctl %s cmd=%08X\n", __FILE__,__LINE__,
2281                         info->device_name, cmd );
2282
2283         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_ioctl"))
2284                 return -ENODEV;
2285
2286         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
2287             (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
2288                 if (tty->flags & (1 << TTY_IO_ERROR))
2289                     return -EIO;
2290         }
2291
2292         return ioctl_common(info, cmd, arg);
2293 }
2294
2295 static int ioctl_common(MGSLPC_INFO *info, unsigned int cmd, unsigned long arg)
2296 {
2297         int error;
2298         struct mgsl_icount cnow;        /* kernel counter temps */
2299         struct serial_icounter_struct __user *p_cuser;  /* user space */
2300         void __user *argp = (void __user *)arg;
2301         unsigned long flags;
2302
2303         switch (cmd) {
2304         case MGSL_IOCGPARAMS:
2305                 return get_params(info, argp);
2306         case MGSL_IOCSPARAMS:
2307                 return set_params(info, argp);
2308         case MGSL_IOCGTXIDLE:
2309                 return get_txidle(info, argp);
2310         case MGSL_IOCSTXIDLE:
2311                 return set_txidle(info, (int)arg);
2312         case MGSL_IOCGIF:
2313                 return get_interface(info, argp);
2314         case MGSL_IOCSIF:
2315                 return set_interface(info,(int)arg);
2316         case MGSL_IOCTXENABLE:
2317                 return set_txenable(info,(int)arg);
2318         case MGSL_IOCRXENABLE:
2319                 return set_rxenable(info,(int)arg);
2320         case MGSL_IOCTXABORT:
2321                 return tx_abort(info);
2322         case MGSL_IOCGSTATS:
2323                 return get_stats(info, argp);
2324         case MGSL_IOCWAITEVENT:
2325                 return wait_events(info, argp);
2326         case TIOCMIWAIT:
2327                 return modem_input_wait(info,(int)arg);
2328         case TIOCGICOUNT:
2329                 spin_lock_irqsave(&info->lock,flags);
2330                 cnow = info->icount;
2331                 spin_unlock_irqrestore(&info->lock,flags);
2332                 p_cuser = argp;
2333                 PUT_USER(error,cnow.cts, &p_cuser->cts);
2334                 if (error) return error;
2335                 PUT_USER(error,cnow.dsr, &p_cuser->dsr);
2336                 if (error) return error;
2337                 PUT_USER(error,cnow.rng, &p_cuser->rng);
2338                 if (error) return error;
2339                 PUT_USER(error,cnow.dcd, &p_cuser->dcd);
2340                 if (error) return error;
2341                 PUT_USER(error,cnow.rx, &p_cuser->rx);
2342                 if (error) return error;
2343                 PUT_USER(error,cnow.tx, &p_cuser->tx);
2344                 if (error) return error;
2345                 PUT_USER(error,cnow.frame, &p_cuser->frame);
2346                 if (error) return error;
2347                 PUT_USER(error,cnow.overrun, &p_cuser->overrun);
2348                 if (error) return error;
2349                 PUT_USER(error,cnow.parity, &p_cuser->parity);
2350                 if (error) return error;
2351                 PUT_USER(error,cnow.brk, &p_cuser->brk);
2352                 if (error) return error;
2353                 PUT_USER(error,cnow.buf_overrun, &p_cuser->buf_overrun);
2354                 if (error) return error;
2355                 return 0;
2356         default:
2357                 return -ENOIOCTLCMD;
2358         }
2359         return 0;
2360 }
2361
2362 /* Set new termios settings
2363  *
2364  * Arguments:
2365  *
2366  *      tty             pointer to tty structure
2367  *      termios         pointer to buffer to hold returned old termios
2368  */
2369 static void mgslpc_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
2370 {
2371         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
2372         unsigned long flags;
2373
2374         if (debug_level >= DEBUG_LEVEL_INFO)
2375                 printk("%s(%d):mgslpc_set_termios %s\n", __FILE__,__LINE__,
2376                         tty->driver->name );
2377
2378         /* just return if nothing has changed */
2379         if ((tty->termios->c_cflag == old_termios->c_cflag)
2380             && (RELEVANT_IFLAG(tty->termios->c_iflag)
2381                 == RELEVANT_IFLAG(old_termios->c_iflag)))
2382           return;
2383
2384         mgslpc_change_params(info);
2385
2386         /* Handle transition to B0 status */
2387         if (old_termios->c_cflag & CBAUD &&
2388             !(tty->termios->c_cflag & CBAUD)) {
2389                 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
2390                 spin_lock_irqsave(&info->lock,flags);
2391                 set_signals(info);
2392                 spin_unlock_irqrestore(&info->lock,flags);
2393         }
2394
2395         /* Handle transition away from B0 status */
2396         if (!(old_termios->c_cflag & CBAUD) &&
2397             tty->termios->c_cflag & CBAUD) {
2398                 info->serial_signals |= SerialSignal_DTR;
2399                 if (!(tty->termios->c_cflag & CRTSCTS) ||
2400                     !test_bit(TTY_THROTTLED, &tty->flags)) {
2401                         info->serial_signals |= SerialSignal_RTS;
2402                 }
2403                 spin_lock_irqsave(&info->lock,flags);
2404                 set_signals(info);
2405                 spin_unlock_irqrestore(&info->lock,flags);
2406         }
2407
2408         /* Handle turning off CRTSCTS */
2409         if (old_termios->c_cflag & CRTSCTS &&
2410             !(tty->termios->c_cflag & CRTSCTS)) {
2411                 tty->hw_stopped = 0;
2412                 tx_release(tty);
2413         }
2414 }
2415
2416 static void mgslpc_close(struct tty_struct *tty, struct file * filp)
2417 {
2418         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2419
2420         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_close"))
2421                 return;
2422
2423         if (debug_level >= DEBUG_LEVEL_INFO)
2424                 printk("%s(%d):mgslpc_close(%s) entry, count=%d\n",
2425                          __FILE__,__LINE__, info->device_name, info->count);
2426
2427         if (!info->count)
2428                 return;
2429
2430         if (tty_hung_up_p(filp))
2431                 goto cleanup;
2432
2433         if ((tty->count == 1) && (info->count != 1)) {
2434                 /*
2435                  * tty->count is 1 and the tty structure will be freed.
2436                  * info->count should be one in this case.
2437                  * if it's not, correct it so that the port is shutdown.
2438                  */
2439                 printk("mgslpc_close: bad refcount; tty->count is 1, "
2440                        "info->count is %d\n", info->count);
2441                 info->count = 1;
2442         }
2443
2444         info->count--;
2445
2446         /* if at least one open remaining, leave hardware active */
2447         if (info->count)
2448                 goto cleanup;
2449
2450         info->flags |= ASYNC_CLOSING;
2451
2452         /* set tty->closing to notify line discipline to
2453          * only process XON/XOFF characters. Only the N_TTY
2454          * discipline appears to use this (ppp does not).
2455          */
2456         tty->closing = 1;
2457
2458         /* wait for transmit data to clear all layers */
2459
2460         if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE) {
2461                 if (debug_level >= DEBUG_LEVEL_INFO)
2462                         printk("%s(%d):mgslpc_close(%s) calling tty_wait_until_sent\n",
2463                                  __FILE__,__LINE__, info->device_name );
2464                 tty_wait_until_sent(tty, info->closing_wait);
2465         }
2466
2467         if (info->flags & ASYNC_INITIALIZED)
2468                 mgslpc_wait_until_sent(tty, info->timeout);
2469
2470         if (tty->driver->flush_buffer)
2471                 tty->driver->flush_buffer(tty);
2472
2473         ldisc_flush_buffer(tty);
2474
2475         shutdown(info);
2476
2477         tty->closing = 0;
2478         info->tty = NULL;
2479
2480         if (info->blocked_open) {
2481                 if (info->close_delay) {
2482                         msleep_interruptible(jiffies_to_msecs(info->close_delay));
2483                 }
2484                 wake_up_interruptible(&info->open_wait);
2485         }
2486
2487         info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
2488
2489         wake_up_interruptible(&info->close_wait);
2490
2491 cleanup:
2492         if (debug_level >= DEBUG_LEVEL_INFO)
2493                 printk("%s(%d):mgslpc_close(%s) exit, count=%d\n", __FILE__,__LINE__,
2494                         tty->driver->name, info->count);
2495 }
2496
2497 /* Wait until the transmitter is empty.
2498  */
2499 static void mgslpc_wait_until_sent(struct tty_struct *tty, int timeout)
2500 {
2501         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2502         unsigned long orig_jiffies, char_time;
2503
2504         if (!info )
2505                 return;
2506
2507         if (debug_level >= DEBUG_LEVEL_INFO)
2508                 printk("%s(%d):mgslpc_wait_until_sent(%s) entry\n",
2509                          __FILE__,__LINE__, info->device_name );
2510
2511         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_wait_until_sent"))
2512                 return;
2513
2514         if (!(info->flags & ASYNC_INITIALIZED))
2515                 goto exit;
2516
2517         orig_jiffies = jiffies;
2518
2519         /* Set check interval to 1/5 of estimated time to
2520          * send a character, and make it at least 1. The check
2521          * interval should also be less than the timeout.
2522          * Note: use tight timings here to satisfy the NIST-PCTS.
2523          */
2524
2525         if ( info->params.data_rate ) {
2526                 char_time = info->timeout/(32 * 5);
2527                 if (!char_time)
2528                         char_time++;
2529         } else
2530                 char_time = 1;
2531
2532         if (timeout)
2533                 char_time = min_t(unsigned long, char_time, timeout);
2534
2535         if (info->params.mode == MGSL_MODE_HDLC) {
2536                 while (info->tx_active) {
2537                         msleep_interruptible(jiffies_to_msecs(char_time));
2538                         if (signal_pending(current))
2539                                 break;
2540                         if (timeout && time_after(jiffies, orig_jiffies + timeout))
2541                                 break;
2542                 }
2543         } else {
2544                 while ((info->tx_count || info->tx_active) &&
2545                         info->tx_enabled) {
2546                         msleep_interruptible(jiffies_to_msecs(char_time));
2547                         if (signal_pending(current))
2548                                 break;
2549                         if (timeout && time_after(jiffies, orig_jiffies + timeout))
2550                                 break;
2551                 }
2552         }
2553
2554 exit:
2555         if (debug_level >= DEBUG_LEVEL_INFO)
2556                 printk("%s(%d):mgslpc_wait_until_sent(%s) exit\n",
2557                          __FILE__,__LINE__, info->device_name );
2558 }
2559
2560 /* Called by tty_hangup() when a hangup is signaled.
2561  * This is the same as closing all open files for the port.
2562  */
2563 static void mgslpc_hangup(struct tty_struct *tty)
2564 {
2565         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2566
2567         if (debug_level >= DEBUG_LEVEL_INFO)
2568                 printk("%s(%d):mgslpc_hangup(%s)\n",
2569                          __FILE__,__LINE__, info->device_name );
2570
2571         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_hangup"))
2572                 return;
2573
2574         mgslpc_flush_buffer(tty);
2575         shutdown(info);
2576
2577         info->count = 0;
2578         info->flags &= ~ASYNC_NORMAL_ACTIVE;
2579         info->tty = NULL;
2580
2581         wake_up_interruptible(&info->open_wait);
2582 }
2583
2584 /* Block the current process until the specified port
2585  * is ready to be opened.
2586  */
2587 static int block_til_ready(struct tty_struct *tty, struct file *filp,
2588                            MGSLPC_INFO *info)
2589 {
2590         DECLARE_WAITQUEUE(wait, current);
2591         int             retval;
2592         int             do_clocal = 0, extra_count = 0;
2593         unsigned long   flags;
2594
2595         if (debug_level >= DEBUG_LEVEL_INFO)
2596                 printk("%s(%d):block_til_ready on %s\n",
2597                          __FILE__,__LINE__, tty->driver->name );
2598
2599         if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
2600                 /* nonblock mode is set or port is not enabled */
2601                 /* just verify that callout device is not active */
2602                 info->flags |= ASYNC_NORMAL_ACTIVE;
2603                 return 0;
2604         }
2605
2606         if (tty->termios->c_cflag & CLOCAL)
2607                 do_clocal = 1;
2608
2609         /* Wait for carrier detect and the line to become
2610          * free (i.e., not in use by the callout).  While we are in
2611          * this loop, info->count is dropped by one, so that
2612          * mgslpc_close() knows when to free things.  We restore it upon
2613          * exit, either normal or abnormal.
2614          */
2615
2616         retval = 0;
2617         add_wait_queue(&info->open_wait, &wait);
2618
2619         if (debug_level >= DEBUG_LEVEL_INFO)
2620                 printk("%s(%d):block_til_ready before block on %s count=%d\n",
2621                          __FILE__,__LINE__, tty->driver->name, info->count );
2622
2623         spin_lock_irqsave(&info->lock, flags);
2624         if (!tty_hung_up_p(filp)) {
2625                 extra_count = 1;
2626                 info->count--;
2627         }
2628         spin_unlock_irqrestore(&info->lock, flags);
2629         info->blocked_open++;
2630
2631         while (1) {
2632                 if ((tty->termios->c_cflag & CBAUD)) {
2633                         spin_lock_irqsave(&info->lock,flags);
2634                         info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
2635                         set_signals(info);
2636                         spin_unlock_irqrestore(&info->lock,flags);
2637                 }
2638
2639                 set_current_state(TASK_INTERRUPTIBLE);
2640
2641                 if (tty_hung_up_p(filp) || !(info->flags & ASYNC_INITIALIZED)){
2642                         retval = (info->flags & ASYNC_HUP_NOTIFY) ?
2643                                         -EAGAIN : -ERESTARTSYS;
2644                         break;
2645                 }
2646
2647                 spin_lock_irqsave(&info->lock,flags);
2648                 get_signals(info);
2649                 spin_unlock_irqrestore(&info->lock,flags);
2650
2651                 if (!(info->flags & ASYNC_CLOSING) &&
2652                     (do_clocal || (info->serial_signals & SerialSignal_DCD)) ) {
2653                         break;
2654                 }
2655
2656                 if (signal_pending(current)) {
2657                         retval = -ERESTARTSYS;
2658                         break;
2659                 }
2660
2661                 if (debug_level >= DEBUG_LEVEL_INFO)
2662                         printk("%s(%d):block_til_ready blocking on %s count=%d\n",
2663                                  __FILE__,__LINE__, tty->driver->name, info->count );
2664
2665                 schedule();
2666         }
2667
2668         set_current_state(TASK_RUNNING);
2669         remove_wait_queue(&info->open_wait, &wait);
2670
2671         if (extra_count)
2672                 info->count++;
2673         info->blocked_open--;
2674
2675         if (debug_level >= DEBUG_LEVEL_INFO)
2676                 printk("%s(%d):block_til_ready after blocking on %s count=%d\n",
2677                          __FILE__,__LINE__, tty->driver->name, info->count );
2678
2679         if (!retval)
2680                 info->flags |= ASYNC_NORMAL_ACTIVE;
2681
2682         return retval;
2683 }
2684
2685 static int mgslpc_open(struct tty_struct *tty, struct file * filp)
2686 {
2687         MGSLPC_INFO     *info;
2688         int                     retval, line;
2689         unsigned long flags;
2690
2691         /* verify range of specified line number */
2692         line = tty->index;
2693         if ((line < 0) || (line >= mgslpc_device_count)) {
2694                 printk("%s(%d):mgslpc_open with invalid line #%d.\n",
2695                         __FILE__,__LINE__,line);
2696                 return -ENODEV;
2697         }
2698
2699         /* find the info structure for the specified line */
2700         info = mgslpc_device_list;
2701         while(info && info->line != line)
2702                 info = info->next_device;
2703         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_open"))
2704                 return -ENODEV;
2705
2706         tty->driver_data = info;
2707         info->tty = tty;
2708
2709         if (debug_level >= DEBUG_LEVEL_INFO)
2710                 printk("%s(%d):mgslpc_open(%s), old ref count = %d\n",
2711                          __FILE__,__LINE__,tty->driver->name, info->count);
2712
2713         /* If port is closing, signal caller to try again */
2714         if (tty_hung_up_p(filp) || info->flags & ASYNC_CLOSING){
2715                 if (info->flags & ASYNC_CLOSING)
2716                         interruptible_sleep_on(&info->close_wait);
2717                 retval = ((info->flags & ASYNC_HUP_NOTIFY) ?
2718                         -EAGAIN : -ERESTARTSYS);
2719                 goto cleanup;
2720         }
2721
2722         info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
2723
2724         spin_lock_irqsave(&info->netlock, flags);
2725         if (info->netcount) {
2726                 retval = -EBUSY;
2727                 spin_unlock_irqrestore(&info->netlock, flags);
2728                 goto cleanup;
2729         }
2730         info->count++;
2731         spin_unlock_irqrestore(&info->netlock, flags);
2732
2733         if (info->count == 1) {
2734                 /* 1st open on this device, init hardware */
2735                 retval = startup(info);
2736                 if (retval < 0)
2737                         goto cleanup;
2738         }
2739
2740         retval = block_til_ready(tty, filp, info);
2741         if (retval) {
2742                 if (debug_level >= DEBUG_LEVEL_INFO)
2743                         printk("%s(%d):block_til_ready(%s) returned %d\n",
2744                                  __FILE__,__LINE__, info->device_name, retval);
2745                 goto cleanup;
2746         }
2747
2748         if (debug_level >= DEBUG_LEVEL_INFO)
2749                 printk("%s(%d):mgslpc_open(%s) success\n",
2750                          __FILE__,__LINE__, info->device_name);
2751         retval = 0;
2752
2753 cleanup:
2754         if (retval) {
2755                 if (tty->count == 1)
2756                         info->tty = NULL; /* tty layer will release tty struct */
2757                 if(info->count)
2758                         info->count--;
2759         }
2760
2761         return retval;
2762 }
2763
2764 /*
2765  * /proc fs routines....
2766  */
2767
2768 static inline int line_info(char *buf, MGSLPC_INFO *info)
2769 {
2770         char    stat_buf[30];
2771         int     ret;
2772         unsigned long flags;
2773
2774         ret = sprintf(buf, "%s:io:%04X irq:%d",
2775                       info->device_name, info->io_base, info->irq_level);
2776
2777         /* output current serial signal states */
2778         spin_lock_irqsave(&info->lock,flags);
2779         get_signals(info);
2780         spin_unlock_irqrestore(&info->lock,flags);
2781
2782         stat_buf[0] = 0;
2783         stat_buf[1] = 0;
2784         if (info->serial_signals & SerialSignal_RTS)
2785                 strcat(stat_buf, "|RTS");
2786         if (info->serial_signals & SerialSignal_CTS)
2787                 strcat(stat_buf, "|CTS");
2788         if (info->serial_signals & SerialSignal_DTR)
2789                 strcat(stat_buf, "|DTR");
2790         if (info->serial_signals & SerialSignal_DSR)
2791                 strcat(stat_buf, "|DSR");
2792         if (info->serial_signals & SerialSignal_DCD)
2793                 strcat(stat_buf, "|CD");
2794         if (info->serial_signals & SerialSignal_RI)
2795                 strcat(stat_buf, "|RI");
2796
2797         if (info->params.mode == MGSL_MODE_HDLC) {
2798                 ret += sprintf(buf+ret, " HDLC txok:%d rxok:%d",
2799                               info->icount.txok, info->icount.rxok);
2800                 if (info->icount.txunder)
2801                         ret += sprintf(buf+ret, " txunder:%d", info->icount.txunder);
2802                 if (info->icount.txabort)
2803                         ret += sprintf(buf+ret, " txabort:%d", info->icount.txabort);
2804                 if (info->icount.rxshort)
2805                         ret += sprintf(buf+ret, " rxshort:%d", info->icount.rxshort);
2806                 if (info->icount.rxlong)
2807                         ret += sprintf(buf+ret, " rxlong:%d", info->icount.rxlong);
2808                 if (info->icount.rxover)
2809                         ret += sprintf(buf+ret, " rxover:%d", info->icount.rxover);
2810                 if (info->icount.rxcrc)
2811                         ret += sprintf(buf+ret, " rxcrc:%d", info->icount.rxcrc);
2812         } else {
2813                 ret += sprintf(buf+ret, " ASYNC tx:%d rx:%d",
2814                               info->icount.tx, info->icount.rx);
2815                 if (info->icount.frame)
2816                         ret += sprintf(buf+ret, " fe:%d", info->icount.frame);
2817                 if (info->icount.parity)
2818                         ret += sprintf(buf+ret, " pe:%d", info->icount.parity);
2819                 if (info->icount.brk)
2820                         ret += sprintf(buf+ret, " brk:%d", info->icount.brk);
2821                 if (info->icount.overrun)
2822                         ret += sprintf(buf+ret, " oe:%d", info->icount.overrun);
2823         }
2824
2825         /* Append serial signal status to end */
2826         ret += sprintf(buf+ret, " %s\n", stat_buf+1);
2827
2828         ret += sprintf(buf+ret, "txactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
2829                        info->tx_active,info->bh_requested,info->bh_running,
2830                        info->pending_bh);
2831
2832         return ret;
2833 }
2834
2835 /* Called to print information about devices
2836  */
2837 static int mgslpc_read_proc(char *page, char **start, off_t off, int count,
2838                  int *eof, void *data)
2839 {
2840         int len = 0, l;
2841         off_t   begin = 0;
2842         MGSLPC_INFO *info;
2843
2844         len += sprintf(page, "synclink driver:%s\n", driver_version);
2845
2846         info = mgslpc_device_list;
2847         while( info ) {
2848                 l = line_info(page + len, info);
2849                 len += l;
2850                 if (len+begin > off+count)
2851                         goto done;
2852                 if (len+begin < off) {
2853                         begin += len;
2854                         len = 0;
2855                 }
2856                 info = info->next_device;
2857         }
2858
2859         *eof = 1;
2860 done:
2861         if (off >= len+begin)
2862                 return 0;
2863         *start = page + (off-begin);
2864         return ((count < begin+len-off) ? count : begin+len-off);
2865 }
2866
2867 static int rx_alloc_buffers(MGSLPC_INFO *info)
2868 {
2869         /* each buffer has header and data */
2870         info->rx_buf_size = sizeof(RXBUF) + info->max_frame_size;
2871
2872         /* calculate total allocation size for 8 buffers */
2873         info->rx_buf_total_size = info->rx_buf_size * 8;
2874
2875         /* limit total allocated memory */
2876         if (info->rx_buf_total_size > 0x10000)
2877                 info->rx_buf_total_size = 0x10000;
2878
2879         /* calculate number of buffers */
2880         info->rx_buf_count = info->rx_buf_total_size / info->rx_buf_size;
2881
2882         info->rx_buf = kmalloc(info->rx_buf_total_size, GFP_KERNEL);
2883         if (info->rx_buf == NULL)
2884                 return -ENOMEM;
2885
2886         rx_reset_buffers(info);
2887         return 0;
2888 }
2889
2890 static void rx_free_buffers(MGSLPC_INFO *info)
2891 {
2892         kfree(info->rx_buf);
2893         info->rx_buf = NULL;
2894 }
2895
2896 static int claim_resources(MGSLPC_INFO *info)
2897 {
2898         if (rx_alloc_buffers(info) < 0 ) {
2899                 printk( "Cant allocate rx buffer %s\n", info->device_name);
2900                 release_resources(info);
2901                 return -ENODEV;
2902         }
2903         return 0;
2904 }
2905
2906 static void release_resources(MGSLPC_INFO *info)
2907 {
2908         if (debug_level >= DEBUG_LEVEL_INFO)
2909                 printk("release_resources(%s)\n", info->device_name);
2910         rx_free_buffers(info);
2911 }
2912
2913 /* Add the specified device instance data structure to the
2914  * global linked list of devices and increment the device count.
2915  *
2916  * Arguments:           info    pointer to device instance data
2917  */
2918 static void mgslpc_add_device(MGSLPC_INFO *info)
2919 {
2920         info->next_device = NULL;
2921         info->line = mgslpc_device_count;
2922         sprintf(info->device_name,"ttySLP%d",info->line);
2923
2924         if (info->line < MAX_DEVICE_COUNT) {
2925                 if (maxframe[info->line])
2926                         info->max_frame_size = maxframe[info->line];
2927                 info->dosyncppp = dosyncppp[info->line];
2928         }
2929
2930         mgslpc_device_count++;
2931
2932         if (!mgslpc_device_list)
2933                 mgslpc_device_list = info;
2934         else {
2935                 MGSLPC_INFO *current_dev = mgslpc_device_list;
2936                 while( current_dev->next_device )
2937                         current_dev = current_dev->next_device;
2938                 current_dev->next_device = info;
2939         }
2940
2941         if (info->max_frame_size < 4096)
2942                 info->max_frame_size = 4096;
2943         else if (info->max_frame_size > 65535)
2944                 info->max_frame_size = 65535;
2945
2946         printk( "SyncLink PC Card %s:IO=%04X IRQ=%d\n",
2947                 info->device_name, info->io_base, info->irq_level);
2948
2949 #if SYNCLINK_GENERIC_HDLC
2950         hdlcdev_init(info);
2951 #endif
2952 }
2953
2954 static void mgslpc_remove_device(MGSLPC_INFO *remove_info)
2955 {
2956         MGSLPC_INFO *info = mgslpc_device_list;
2957         MGSLPC_INFO *last = NULL;
2958
2959         while(info) {
2960                 if (info == remove_info) {
2961                         if (last)
2962                                 last->next_device = info->next_device;
2963                         else
2964                                 mgslpc_device_list = info->next_device;
2965 #if SYNCLINK_GENERIC_HDLC
2966                         hdlcdev_exit(info);
2967 #endif
2968                         release_resources(info);
2969                         kfree(info);
2970                         mgslpc_device_count--;
2971                         return;
2972                 }
2973                 last = info;
2974                 info = info->next_device;
2975         }
2976 }
2977
2978 static struct pcmcia_device_id mgslpc_ids[] = {
2979         PCMCIA_DEVICE_MANF_CARD(0x02c5, 0x0050),
2980         PCMCIA_DEVICE_NULL
2981 };
2982 MODULE_DEVICE_TABLE(pcmcia, mgslpc_ids);
2983
2984 static struct pcmcia_driver mgslpc_driver = {
2985         .owner          = THIS_MODULE,
2986         .drv            = {
2987                 .name   = "synclink_cs",
2988         },
2989         .probe          = mgslpc_probe,
2990         .remove         = mgslpc_detach,
2991         .id_table       = mgslpc_ids,
2992         .suspend        = mgslpc_suspend,
2993         .resume         = mgslpc_resume,
2994 };
2995
2996 static const struct tty_operations mgslpc_ops = {
2997         .open = mgslpc_open,
2998         .close = mgslpc_close,
2999         .write = mgslpc_write,
3000         .put_char = mgslpc_put_char,
3001         .flush_chars = mgslpc_flush_chars,
3002         .write_room = mgslpc_write_room,
3003         .chars_in_buffer = mgslpc_chars_in_buffer,
3004         .flush_buffer = mgslpc_flush_buffer,
3005         .ioctl = mgslpc_ioctl,
3006         .throttle = mgslpc_throttle,
3007         .unthrottle = mgslpc_unthrottle,
3008         .send_xchar = mgslpc_send_xchar,
3009         .break_ctl = mgslpc_break,
3010         .wait_until_sent = mgslpc_wait_until_sent,
3011         .read_proc = mgslpc_read_proc,
3012         .set_termios = mgslpc_set_termios,
3013         .stop = tx_pause,
3014         .start = tx_release,
3015         .hangup = mgslpc_hangup,
3016         .tiocmget = tiocmget,
3017         .tiocmset = tiocmset,
3018 };
3019
3020 static void synclink_cs_cleanup(void)
3021 {
3022         int rc;
3023
3024         printk("Unloading %s: version %s\n", driver_name, driver_version);
3025
3026         while(mgslpc_device_list)
3027                 mgslpc_remove_device(mgslpc_device_list);
3028
3029         if (serial_driver) {
3030                 if ((rc = tty_unregister_driver(serial_driver)))
3031                         printk("%s(%d) failed to unregister tty driver err=%d\n",
3032                                __FILE__,__LINE__,rc);
3033                 put_tty_driver(serial_driver);
3034         }
3035
3036         pcmcia_unregister_driver(&mgslpc_driver);
3037 }
3038
3039 static int __init synclink_cs_init(void)
3040 {
3041     int rc;
3042
3043     if (break_on_load) {
3044             mgslpc_get_text_ptr();
3045             BREAKPOINT();
3046     }
3047
3048     printk("%s %s\n", driver_name, driver_version);
3049
3050     if ((rc = pcmcia_register_driver(&mgslpc_driver)) < 0)
3051             return rc;
3052
3053     serial_driver = alloc_tty_driver(MAX_DEVICE_COUNT);
3054     if (!serial_driver) {
3055             rc = -ENOMEM;
3056             goto error;
3057     }
3058
3059     /* Initialize the tty_driver structure */
3060
3061     serial_driver->owner = THIS_MODULE;
3062     serial_driver->driver_name = "synclink_cs";
3063     serial_driver->name = "ttySLP";
3064     serial_driver->major = ttymajor;
3065     serial_driver->minor_start = 64;
3066     serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
3067     serial_driver->subtype = SERIAL_TYPE_NORMAL;
3068     serial_driver->init_termios = tty_std_termios;
3069     serial_driver->init_termios.c_cflag =
3070             B9600 | CS8 | CREAD | HUPCL | CLOCAL;
3071     serial_driver->flags = TTY_DRIVER_REAL_RAW;
3072     tty_set_operations(serial_driver, &mgslpc_ops);
3073
3074     if ((rc = tty_register_driver(serial_driver)) < 0) {
3075             printk("%s(%d):Couldn't register serial driver\n",
3076                    __FILE__,__LINE__);
3077             put_tty_driver(serial_driver);
3078             serial_driver = NULL;
3079             goto error;
3080     }
3081
3082     printk("%s %s, tty major#%d\n",
3083            driver_name, driver_version,
3084            serial_driver->major);
3085
3086     return 0;
3087
3088 error:
3089     synclink_cs_cleanup();
3090     return rc;
3091 }
3092
3093 static void __exit synclink_cs_exit(void)
3094 {
3095         synclink_cs_cleanup();
3096 }
3097
3098 module_init(synclink_cs_init);
3099 module_exit(synclink_cs_exit);
3100
3101 static void mgslpc_set_rate(MGSLPC_INFO *info, unsigned char channel, unsigned int rate)
3102 {
3103         unsigned int M, N;
3104         unsigned char val;
3105
3106         /* note:standard BRG mode is broken in V3.2 chip
3107          * so enhanced mode is always used
3108          */
3109
3110         if (rate) {
3111                 N = 3686400 / rate;
3112                 if (!N)
3113                         N = 1;
3114                 N >>= 1;
3115                 for (M = 1; N > 64 && M < 16; M++)
3116                         N >>= 1;
3117                 N--;
3118
3119                 /* BGR[5..0] = N
3120                  * BGR[9..6] = M
3121                  * BGR[7..0] contained in BGR register
3122                  * BGR[9..8] contained in CCR2[7..6]
3123                  * divisor = (N+1)*2^M
3124                  *
3125                  * Note: M *must* not be zero (causes asymetric duty cycle)
3126                  */
3127                 write_reg(info, (unsigned char) (channel + BGR),
3128                                   (unsigned char) ((M << 6) + N));
3129                 val = read_reg(info, (unsigned char) (channel + CCR2)) & 0x3f;
3130                 val |= ((M << 4) & 0xc0);
3131                 write_reg(info, (unsigned char) (channel + CCR2), val);
3132         }
3133 }
3134
3135 /* Enabled the AUX clock output at the specified frequency.
3136  */
3137 static void enable_auxclk(MGSLPC_INFO *info)
3138 {
3139         unsigned char val;
3140
3141         /* MODE
3142          *
3143          * 07..06  MDS[1..0] 10 = transparent HDLC mode
3144          * 05      ADM Address Mode, 0 = no addr recognition
3145          * 04      TMD Timer Mode, 0 = external
3146          * 03      RAC Receiver Active, 0 = inactive
3147          * 02      RTS 0=RTS active during xmit, 1=RTS always active
3148          * 01      TRS Timer Resolution, 1=512
3149          * 00      TLP Test Loop, 0 = no loop
3150          *
3151          * 1000 0010
3152          */
3153         val = 0x82;
3154
3155         /* channel B RTS is used to enable AUXCLK driver on SP505 */
3156         if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
3157                 val |= BIT2;
3158         write_reg(info, CHB + MODE, val);
3159
3160         /* CCR0
3161          *
3162          * 07      PU Power Up, 1=active, 0=power down
3163          * 06      MCE Master Clock Enable, 1=enabled
3164          * 05      Reserved, 0
3165          * 04..02  SC[2..0] Encoding
3166          * 01..00  SM[1..0] Serial Mode, 00=HDLC
3167          *
3168          * 11000000
3169          */
3170         write_reg(info, CHB + CCR0, 0xc0);
3171
3172         /* CCR1
3173          *
3174          * 07      SFLG Shared Flag, 0 = disable shared flags
3175          * 06      GALP Go Active On Loop, 0 = not used
3176          * 05      GLP Go On Loop, 0 = not used
3177          * 04      ODS Output Driver Select, 1=TxD is push-pull output
3178          * 03      ITF Interframe Time Fill, 0=mark, 1=flag
3179          * 02..00  CM[2..0] Clock Mode
3180          *
3181          * 0001 0111
3182          */
3183         write_reg(info, CHB + CCR1, 0x17);
3184
3185         /* CCR2 (Channel B)
3186          *
3187          * 07..06  BGR[9..8] Baud rate bits 9..8
3188          * 05      BDF Baud rate divisor factor, 0=1, 1=BGR value
3189          * 04      SSEL Clock source select, 1=submode b
3190          * 03      TOE 0=TxCLK is input, 1=TxCLK is output
3191          * 02      RWX Read/Write Exchange 0=disabled
3192          * 01      C32, CRC select, 0=CRC-16, 1=CRC-32
3193          * 00      DIV, data inversion 0=disabled, 1=enabled
3194          *
3195          * 0011 1000
3196          */
3197         if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
3198                 write_reg(info, CHB + CCR2, 0x38);
3199         else
3200                 write_reg(info, CHB + CCR2, 0x30);
3201
3202         /* CCR4
3203          *
3204          * 07      MCK4 Master Clock Divide by 4, 1=enabled
3205          * 06      EBRG Enhanced Baud Rate Generator Mode, 1=enabled
3206          * 05      TST1 Test Pin, 0=normal operation
3207          * 04      ICD Ivert Carrier Detect, 1=enabled (active low)
3208          * 03..02  Reserved, must be 0
3209          * 01..00  RFT[1..0] RxFIFO Threshold 00=32 bytes
3210          *
3211          * 0101 0000
3212          */
3213         write_reg(info, CHB + CCR4, 0x50);
3214
3215         /* if auxclk not enabled, set internal BRG so
3216          * CTS transitions can be detected (requires TxC)
3217          */
3218         if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
3219                 mgslpc_set_rate(info, CHB, info->params.clock_speed);
3220         else
3221                 mgslpc_set_rate(info, CHB, 921600);
3222 }
3223
3224 static void loopback_enable(MGSLPC_INFO *info)
3225 {
3226         unsigned char val;
3227
3228         /* CCR1:02..00  CM[2..0] Clock Mode = 111 (clock mode 7) */
3229         val = read_reg(info, CHA + CCR1) | (BIT2 + BIT1 + BIT0);
3230         write_reg(info, CHA + CCR1, val);
3231
3232         /* CCR2:04 SSEL Clock source select, 1=submode b */
3233         val = read_reg(info, CHA + CCR2) | (BIT4 + BIT5);
3234         write_reg(info, CHA + CCR2, val);
3235
3236         /* set LinkSpeed if available, otherwise default to 2Mbps */
3237         if (info->params.clock_speed)
3238                 mgslpc_set_rate(info, CHA, info->params.clock_speed);
3239         else
3240                 mgslpc_set_rate(info, CHA, 1843200);
3241
3242         /* MODE:00 TLP Test Loop, 1=loopback enabled */
3243         val = read_reg(info, CHA + MODE) | BIT0;
3244         write_reg(info, CHA + MODE, val);
3245 }
3246
3247 static void hdlc_mode(MGSLPC_INFO *info)
3248 {
3249         unsigned char val;
3250         unsigned char clkmode, clksubmode;
3251
3252         /* disable all interrupts */
3253         irq_disable(info, CHA, 0xffff);
3254         irq_disable(info, CHB, 0xffff);
3255         port_irq_disable(info, 0xff);
3256
3257         /* assume clock mode 0a, rcv=RxC xmt=TxC */
3258         clkmode = clksubmode = 0;
3259         if (info->params.flags & HDLC_FLAG_RXC_DPLL
3260             && info->params.flags & HDLC_FLAG_TXC_DPLL) {
3261                 /* clock mode 7a, rcv = DPLL, xmt = DPLL */
3262                 clkmode = 7;
3263         } else if (info->params.flags & HDLC_FLAG_RXC_BRG
3264                  && info->params.flags & HDLC_FLAG_TXC_BRG) {
3265                 /* clock mode 7b, rcv = BRG, xmt = BRG */
3266                 clkmode = 7;
3267                 clksubmode = 1;
3268         } else if (info->params.flags & HDLC_FLAG_RXC_DPLL) {
3269                 if (info->params.flags & HDLC_FLAG_TXC_BRG) {
3270                         /* clock mode 6b, rcv = DPLL, xmt = BRG/16 */
3271                         clkmode = 6;
3272                         clksubmode = 1;
3273                 } else {
3274                         /* clock mode 6a, rcv = DPLL, xmt = TxC */
3275                         clkmode = 6;
3276                 }
3277         } else if (info->params.flags & HDLC_FLAG_TXC_BRG) {
3278                 /* clock mode 0b, rcv = RxC, xmt = BRG */
3279                 clksubmode = 1;
3280         }
3281
3282         /* MODE
3283          *
3284          * 07..06  MDS[1..0] 10 = transparent HDLC mode
3285          * 05      ADM Address Mode, 0 = no addr recognition
3286          * 04      TMD Timer Mode, 0 = external
3287          * 03      RAC Receiver Active, 0 = inactive
3288          * 02      RTS 0=RTS active during xmit, 1=RTS always active
3289          * 01      TRS Timer Resolution, 1=512
3290          * 00      TLP Test Loop, 0 = no loop
3291          *
3292          * 1000 0010
3293          */
3294         val = 0x82;
3295         if (info->params.loopback)
3296                 val |= BIT0;
3297
3298         /* preserve RTS state */
3299         if (info->serial_signals & SerialSignal_RTS)
3300                 val |= BIT2;
3301         write_reg(info, CHA + MODE, val);
3302
3303         /* CCR0
3304          *
3305          * 07      PU Power Up, 1=active, 0=power down
3306          * 06      MCE Master Clock Enable, 1=enabled
3307          * 05      Reserved, 0
3308          * 04..02  SC[2..0] Encoding
3309          * 01..00  SM[1..0] Serial Mode, 00=HDLC
3310          *
3311          * 11000000
3312          */
3313         val = 0xc0;
3314         switch (info->params.encoding)
3315         {
3316         case HDLC_ENCODING_NRZI:
3317                 val |= BIT3;
3318                 break;
3319         case HDLC_ENCODING_BIPHASE_SPACE:
3320                 val |= BIT4;
3321                 break;          // FM0
3322         case HDLC_ENCODING_BIPHASE_MARK:
3323                 val |= BIT4 + BIT2;
3324                 break;          // FM1
3325         case HDLC_ENCODING_BIPHASE_LEVEL:
3326                 val |= BIT4 + BIT3;
3327                 break;          // Manchester
3328         }
3329         write_reg(info, CHA + CCR0, val);
3330
3331         /* CCR1
3332          *
3333          * 07      SFLG Shared Flag, 0 = disable shared flags
3334          * 06      GALP Go Active On Loop, 0 = not used
3335          * 05      GLP Go On Loop, 0 = not used
3336          * 04      ODS Output Driver Select, 1=TxD is push-pull output
3337          * 03      ITF Interframe Time Fill, 0=mark, 1=flag
3338          * 02..00  CM[2..0] Clock Mode
3339          *
3340          * 0001 0000
3341          */
3342         val = 0x10 + clkmode;
3343         write_reg(info, CHA + CCR1, val);
3344
3345         /* CCR2
3346          *
3347          * 07..06  BGR[9..8] Baud rate bits 9..8
3348          * 05      BDF Baud rate divisor factor, 0=1, 1=BGR value
3349          * 04      SSEL Clock source select, 1=submode b
3350          * 03      TOE 0=TxCLK is input, 0=TxCLK is input
3351          * 02      RWX Read/Write Exchange 0=disabled
3352          * 01      C32, CRC select, 0=CRC-16, 1=CRC-32
3353          * 00      DIV, data inversion 0=disabled, 1=enabled
3354          *
3355          * 0000 0000
3356          */
3357         val = 0x00;
3358         if (clkmode == 2 || clkmode == 3 || clkmode == 6
3359             || clkmode == 7 || (clkmode == 0 && clksubmode == 1))
3360                 val |= BIT5;
3361         if (clksubmode)
3362                 val |= BIT4;
3363         if (info->params.crc_type == HDLC_CRC_32_CCITT)
3364                 val |= BIT1;
3365         if (info->params.encoding == HDLC_ENCODING_NRZB)
3366                 val |= BIT0;
3367         write_reg(info, CHA + CCR2, val);
3368
3369         /* CCR3
3370          *
3371          * 07..06  PRE[1..0] Preamble count 00=1, 01=2, 10=4, 11=8
3372          * 05      EPT Enable preamble transmission, 1=enabled
3373          * 04      RADD Receive address pushed to FIFO, 0=disabled
3374          * 03      CRL CRC Reset Level, 0=FFFF
3375          * 02      RCRC Rx CRC 0=On 1=Off
3376          * 01      TCRC Tx CRC 0=On 1=Off
3377          * 00      PSD DPLL Phase Shift Disable
3378          *
3379          * 0000 0000
3380          */
3381         val = 0x00;
3382         if (info->params.crc_type == HDLC_CRC_NONE)
3383                 val |= BIT2 + BIT1;
3384         if (info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE)
3385                 val |= BIT5;
3386         switch (info->params.preamble_length)
3387         {
3388         case HDLC_PREAMBLE_LENGTH_16BITS:
3389                 val |= BIT6;
3390                 break;
3391         case HDLC_PREAMBLE_LENGTH_32BITS:
3392                 val |= BIT6;
3393                 break;
3394         case HDLC_PREAMBLE_LENGTH_64BITS:
3395                 val |= BIT7 + BIT6;
3396                 break;
3397         }
3398         write_reg(info, CHA + CCR3, val);
3399
3400         /* PRE - Preamble pattern */
3401         val = 0;
3402         switch (info->params.preamble)
3403         {
3404         case HDLC_PREAMBLE_PATTERN_FLAGS: val = 0x7e; break;
3405         case HDLC_PREAMBLE_PATTERN_10:    val = 0xaa; break;
3406         case HDLC_PREAMBLE_PATTERN_01:    val = 0x55; break;
3407         case HDLC_PREAMBLE_PATTERN_ONES:  val = 0xff; break;
3408         }
3409         write_reg(info, CHA + PRE, val);
3410
3411         /* CCR4
3412          *
3413          * 07      MCK4 Master Clock Divide by 4, 1=enabled
3414          * 06      EBRG Enhanced Baud Rate Generator Mode, 1=enabled
3415          * 05      TST1 Test Pin, 0=normal operation
3416          * 04      ICD Ivert Carrier Detect, 1=enabled (active low)
3417          * 03..02  Reserved, must be 0
3418          * 01..00  RFT[1..0] RxFIFO Threshold 00=32 bytes
3419          *
3420          * 0101 0000
3421          */
3422         val = 0x50;
3423         write_reg(info, CHA + CCR4, val);
3424         if (info->params.flags & HDLC_FLAG_RXC_DPLL)
3425                 mgslpc_set_rate(info, CHA, info->params.clock_speed * 16);
3426         else
3427                 mgslpc_set_rate(info, CHA, info->params.clock_speed);
3428
3429         /* RLCR Receive length check register
3430          *
3431          * 7     1=enable receive length check
3432          * 6..0  Max frame length = (RL + 1) * 32
3433          */
3434         write_reg(info, CHA + RLCR, 0);
3435
3436         /* XBCH Transmit Byte Count High
3437          *
3438          * 07      DMA mode, 0 = interrupt driven
3439          * 06      NRM, 0=ABM (ignored)
3440          * 05      CAS Carrier Auto Start
3441          * 04      XC Transmit Continuously (ignored)
3442          * 03..00  XBC[10..8] Transmit byte count bits 10..8
3443          *
3444          * 0000 0000
3445          */
3446         val = 0x00;
3447         if (info->params.flags & HDLC_FLAG_AUTO_DCD)
3448                 val |= BIT5;
3449         write_reg(info, CHA + XBCH, val);
3450         enable_auxclk(info);
3451         if (info->params.loopback || info->testing_irq)
3452                 loopback_enable(info);
3453         if (info->params.flags & HDLC_FLAG_AUTO_CTS)
3454         {
3455                 irq_enable(info, CHB, IRQ_CTS);
3456                 /* PVR[3] 1=AUTO CTS active */
3457                 set_reg_bits(info, CHA + PVR, BIT3);
3458         } else
3459                 clear_reg_bits(info, CHA + PVR, BIT3);
3460
3461         irq_enable(info, CHA,
3462                          IRQ_RXEOM + IRQ_RXFIFO + IRQ_ALLSENT +
3463                          IRQ_UNDERRUN + IRQ_TXFIFO);
3464         issue_command(info, CHA, CMD_TXRESET + CMD_RXRESET);
3465         wait_command_complete(info, CHA);
3466         read_reg16(info, CHA + ISR);    /* clear pending IRQs */
3467
3468         /* Master clock mode enabled above to allow reset commands
3469          * to complete even if no data clocks are present.
3470          *
3471          * Disable master clock mode for normal communications because
3472          * V3.2 of the ESCC2 has a bug that prevents the transmit all sent
3473          * IRQ when in master clock mode.
3474          *
3475          * Leave master clock mode enabled for IRQ test because the
3476          * timer IRQ used by the test can only happen in master clock mode.
3477          */
3478         if (!info->testing_irq)
3479                 clear_reg_bits(info, CHA + CCR0, BIT6);
3480
3481         tx_set_idle(info);
3482
3483         tx_stop(info);
3484         rx_stop(info);
3485 }
3486
3487 static void rx_stop(MGSLPC_INFO *info)
3488 {
3489         if (debug_level >= DEBUG_LEVEL_ISR)
3490                 printk("%s(%d):rx_stop(%s)\n",
3491                          __FILE__,__LINE__, info->device_name );
3492
3493         /* MODE:03 RAC Receiver Active, 0=inactive */
3494         clear_reg_bits(info, CHA + MODE, BIT3);
3495
3496         info->rx_enabled = 0;
3497         info->rx_overflow = 0;
3498 }
3499
3500 static void rx_start(MGSLPC_INFO *info)
3501 {
3502         if (debug_level >= DEBUG_LEVEL_ISR)
3503                 printk("%s(%d):rx_start(%s)\n",
3504                          __FILE__,__LINE__, info->device_name );
3505
3506         rx_reset_buffers(info);
3507         info->rx_enabled = 0;
3508         info->rx_overflow = 0;
3509
3510         /* MODE:03 RAC Receiver Active, 1=active */
3511         set_reg_bits(info, CHA + MODE, BIT3);
3512
3513         info->rx_enabled = 1;
3514 }
3515
3516 static void tx_start(MGSLPC_INFO *info)
3517 {
3518         if (debug_level >= DEBUG_LEVEL_ISR)
3519                 printk("%s(%d):tx_start(%s)\n",
3520                          __FILE__,__LINE__, info->device_name );
3521
3522         if (info->tx_count) {
3523                 /* If auto RTS enabled and RTS is inactive, then assert */
3524                 /* RTS and set a flag indicating that the driver should */
3525                 /* negate RTS when the transmission completes. */
3526                 info->drop_rts_on_tx_done = 0;
3527
3528                 if (info->params.flags & HDLC_FLAG_AUTO_RTS) {
3529                         get_signals(info);
3530                         if (!(info->serial_signals & SerialSignal_RTS)) {
3531                                 info->serial_signals |= SerialSignal_RTS;
3532                                 set_signals(info);
3533                                 info->drop_rts_on_tx_done = 1;
3534                         }
3535                 }
3536
3537                 if (info->params.mode == MGSL_MODE_ASYNC) {
3538                         if (!info->tx_active) {
3539                                 info->tx_active = 1;
3540                                 tx_ready(info);
3541                         }
3542                 } else {
3543                         info->tx_active = 1;
3544                         tx_ready(info);
3545                         mod_timer(&info->tx_timer, jiffies +
3546                                         msecs_to_jiffies(5000));
3547                 }
3548         }
3549
3550         if (!info->tx_enabled)
3551                 info->tx_enabled = 1;
3552 }
3553
3554 static void tx_stop(MGSLPC_INFO *info)
3555 {
3556         if (debug_level >= DEBUG_LEVEL_ISR)
3557                 printk("%s(%d):tx_stop(%s)\n",
3558                          __FILE__,__LINE__, info->device_name );
3559
3560         del_timer(&info->tx_timer);
3561
3562         info->tx_enabled = 0;
3563         info->tx_active  = 0;
3564 }
3565
3566 /* Reset the adapter to a known state and prepare it for further use.
3567  */
3568 static void reset_device(MGSLPC_INFO *info)
3569 {
3570         /* power up both channels (set BIT7) */
3571         write_reg(info, CHA + CCR0, 0x80);
3572         write_reg(info, CHB + CCR0, 0x80);
3573         write_reg(info, CHA + MODE, 0);
3574         write_reg(info, CHB + MODE, 0);
3575
3576         /* disable all interrupts */
3577         irq_disable(info, CHA, 0xffff);
3578         irq_disable(info, CHB, 0xffff);
3579         port_irq_disable(info, 0xff);
3580
3581         /* PCR Port Configuration Register
3582          *
3583          * 07..04  DEC[3..0] Serial I/F select outputs
3584          * 03      output, 1=AUTO CTS control enabled
3585          * 02      RI Ring Indicator input 0=active
3586          * 01      DSR input 0=active
3587          * 00      DTR output 0=active
3588          *
3589          * 0000 0110
3590          */
3591         write_reg(info, PCR, 0x06);
3592
3593         /* PVR Port Value Register
3594          *
3595          * 07..04  DEC[3..0] Serial I/F select (0000=disabled)
3596          * 03      AUTO CTS output 1=enabled
3597          * 02      RI Ring Indicator input
3598          * 01      DSR input
3599          * 00      DTR output (1=inactive)
3600          *
3601          * 0000 0001
3602          */
3603 //      write_reg(info, PVR, PVR_DTR);
3604
3605         /* IPC Interrupt Port Configuration
3606          *
3607          * 07      VIS 1=Masked interrupts visible
3608          * 06..05  Reserved, 0
3609          * 04..03  SLA Slave address, 00 ignored
3610          * 02      CASM Cascading Mode, 1=daisy chain
3611          * 01..00  IC[1..0] Interrupt Config, 01=push-pull output, active low
3612          *
3613          * 0000 0101
3614          */
3615         write_reg(info, IPC, 0x05);
3616 }
3617
3618 static void async_mode(MGSLPC_INFO *info)
3619 {
3620         unsigned char val;
3621
3622         /* disable all interrupts */
3623         irq_disable(info, CHA, 0xffff);
3624         irq_disable(info, CHB, 0xffff);
3625         port_irq_disable(info, 0xff);
3626
3627         /* MODE
3628          *
3629          * 07      Reserved, 0
3630          * 06      FRTS RTS State, 0=active
3631          * 05      FCTS Flow Control on CTS
3632          * 04      FLON Flow Control Enable
3633          * 03      RAC Receiver Active, 0 = inactive
3634          * 02      RTS 0=Auto RTS, 1=manual RTS
3635          * 01      TRS Timer Resolution, 1=512
3636          * 00      TLP Test Loop, 0 = no loop
3637          *
3638          * 0000 0110
3639          */
3640         val = 0x06;
3641         if (info->params.loopback)
3642                 val |= BIT0;
3643
3644         /* preserve RTS state */
3645         if (!(info->serial_signals & SerialSignal_RTS))
3646                 val |= BIT6;
3647         write_reg(info, CHA + MODE, val);
3648
3649         /* CCR0
3650          *
3651          * 07      PU Power Up, 1=active, 0=power down
3652          * 06      MCE Master Clock Enable, 1=enabled
3653          * 05      Reserved, 0
3654          * 04..02  SC[2..0] Encoding, 000=NRZ
3655          * 01..00  SM[1..0] Serial Mode, 11=Async
3656          *
3657          * 1000 0011
3658          */
3659         write_reg(info, CHA + CCR0, 0x83);
3660
3661         /* CCR1
3662          *
3663          * 07..05  Reserved, 0
3664          * 04      ODS Output Driver Select, 1=TxD is push-pull output
3665          * 03      BCR Bit Clock Rate, 1=16x
3666          * 02..00  CM[2..0] Clock Mode, 111=BRG
3667          *
3668          * 0001 1111
3669          */
3670         write_reg(info, CHA + CCR1, 0x1f);
3671
3672         /* CCR2 (channel A)
3673          *
3674          * 07..06  BGR[9..8] Baud rate bits 9..8
3675          * 05      BDF Baud rate divisor factor, 0=1, 1=BGR value
3676          * 04      SSEL Clock source select, 1=submode b
3677          * 03      TOE 0=TxCLK is input, 0=TxCLK is input
3678          * 02      RWX Read/Write Exchange 0=disabled
3679          * 01      Reserved, 0
3680          * 00      DIV, data inversion 0=disabled, 1=enabled
3681          *
3682          * 0001 0000
3683          */
3684         write_reg(info, CHA + CCR2, 0x10);
3685
3686         /* CCR3
3687          *
3688          * 07..01  Reserved, 0
3689          * 00      PSD DPLL Phase Shift Disable
3690          *
3691          * 0000 0000
3692          */
3693         write_reg(info, CHA + CCR3, 0);
3694
3695         /* CCR4
3696          *
3697          * 07      MCK4 Master Clock Divide by 4, 1=enabled
3698          * 06      EBRG Enhanced Baud Rate Generator Mode, 1=enabled
3699          * 05      TST1 Test Pin, 0=normal operation
3700          * 04      ICD Ivert Carrier Detect, 1=enabled (active low)
3701          * 03..00  Reserved, must be 0
3702          *
3703          * 0101 0000
3704          */
3705         write_reg(info, CHA + CCR4, 0x50);
3706         mgslpc_set_rate(info, CHA, info->params.data_rate * 16);
3707
3708         /* DAFO Data Format
3709          *
3710          * 07      Reserved, 0
3711          * 06      XBRK transmit break, 0=normal operation
3712          * 05      Stop bits (0=1, 1=2)
3713          * 04..03  PAR[1..0] Parity (01=odd, 10=even)
3714          * 02      PAREN Parity Enable
3715          * 01..00  CHL[1..0] Character Length (00=8, 01=7)
3716          *
3717          */
3718         val = 0x00;
3719         if (info->params.data_bits != 8)
3720                 val |= BIT0;    /* 7 bits */
3721         if (info->params.stop_bits != 1)
3722                 val |= BIT5;
3723         if (info->params.parity != ASYNC_PARITY_NONE)
3724         {
3725                 val |= BIT2;    /* Parity enable */
3726                 if (info->params.parity == ASYNC_PARITY_ODD)
3727                         val |= BIT3;
3728                 else
3729                         val |= BIT4;
3730         }
3731         write_reg(info, CHA + DAFO, val);
3732
3733         /* RFC Rx FIFO Control
3734          *
3735          * 07      Reserved, 0
3736          * 06      DPS, 1=parity bit not stored in data byte
3737          * 05      DXS, 0=all data stored in FIFO (including XON/XOFF)
3738          * 04      RFDF Rx FIFO Data Format, 1=status byte stored in FIFO
3739          * 03..02  RFTH[1..0], rx threshold, 11=16 status + 16 data byte
3740          * 01      Reserved, 0
3741          * 00      TCDE Terminate Char Detect Enable, 0=disabled
3742          *
3743          * 0101 1100
3744          */
3745         write_reg(info, CHA + RFC, 0x5c);
3746
3747         /* RLCR Receive length check register
3748          *
3749          * Max frame length = (RL + 1) * 32
3750          */
3751         write_reg(info, CHA + RLCR, 0);
3752
3753         /* XBCH Transmit Byte Count High
3754          *
3755          * 07      DMA mode, 0 = interrupt driven
3756          * 06      NRM, 0=ABM (ignored)
3757          * 05      CAS Carrier Auto Start
3758          * 04      XC Transmit Continuously (ignored)
3759          * 03..00  XBC[10..8] Transmit byte count bits 10..8
3760          *
3761          * 0000 0000
3762          */
3763         val = 0x00;
3764         if (info->params.flags & HDLC_FLAG_AUTO_DCD)
3765                 val |= BIT5;
3766         write_reg(info, CHA + XBCH, val);
3767         if (info->params.flags & HDLC_FLAG_AUTO_CTS)
3768                 irq_enable(info, CHA, IRQ_CTS);
3769
3770         /* MODE:03 RAC Receiver Active, 1=active */
3771         set_reg_bits(info, CHA + MODE, BIT3);
3772         enable_auxclk(info);
3773         if (info->params.flags & HDLC_FLAG_AUTO_CTS) {
3774                 irq_enable(info, CHB, IRQ_CTS);
3775                 /* PVR[3] 1=AUTO CTS active */
3776                 set_reg_bits(info, CHA + PVR, BIT3);
3777         } else
3778                 clear_reg_bits(info, CHA + PVR, BIT3);
3779         irq_enable(info, CHA,
3780                           IRQ_RXEOM + IRQ_RXFIFO + IRQ_BREAK_ON + IRQ_RXTIME +
3781                           IRQ_ALLSENT + IRQ_TXFIFO);
3782         issue_command(info, CHA, CMD_TXRESET + CMD_RXRESET);
3783         wait_command_complete(info, CHA);
3784         read_reg16(info, CHA + ISR);    /* clear pending IRQs */
3785 }
3786
3787 /* Set the HDLC idle mode for the transmitter.
3788  */
3789 static void tx_set_idle(MGSLPC_INFO *info)
3790 {
3791         /* Note: ESCC2 only supports flags and one idle modes */
3792         if (info->idle_mode == HDLC_TXIDLE_FLAGS)
3793                 set_reg_bits(info, CHA + CCR1, BIT3);
3794         else
3795                 clear_reg_bits(info, CHA + CCR1, BIT3);
3796 }
3797
3798 /* get state of the V24 status (input) signals.
3799  */
3800 static void get_signals(MGSLPC_INFO *info)
3801 {
3802         unsigned char status = 0;
3803
3804         /* preserve DTR and RTS */
3805         info->serial_signals &= SerialSignal_DTR + SerialSignal_RTS;
3806
3807         if (read_reg(info, CHB + VSTR) & BIT7)
3808                 info->serial_signals |= SerialSignal_DCD;
3809         if (read_reg(info, CHB + STAR) & BIT1)
3810                 info->serial_signals |= SerialSignal_CTS;
3811
3812         status = read_reg(info, CHA + PVR);
3813         if (!(status & PVR_RI))
3814                 info->serial_signals |= SerialSignal_RI;
3815         if (!(status & PVR_DSR))
3816                 info->serial_signals |= SerialSignal_DSR;
3817 }
3818
3819 /* Set the state of DTR and RTS based on contents of
3820  * serial_signals member of device extension.
3821  */
3822 static void set_signals(MGSLPC_INFO *info)
3823 {
3824         unsigned char val;
3825
3826         val = read_reg(info, CHA + MODE);
3827         if (info->params.mode == MGSL_MODE_ASYNC) {
3828                 if (info->serial_signals & SerialSignal_RTS)
3829                         val &= ~BIT6;
3830                 else
3831                         val |= BIT6;
3832         } else {
3833                 if (info->serial_signals & SerialSignal_RTS)
3834                         val |= BIT2;
3835                 else
3836                         val &= ~BIT2;
3837         }
3838         write_reg(info, CHA + MODE, val);
3839
3840         if (info->serial_signals & SerialSignal_DTR)
3841                 clear_reg_bits(info, CHA + PVR, PVR_DTR);
3842         else
3843                 set_reg_bits(info, CHA + PVR, PVR_DTR);
3844 }
3845
3846 static void rx_reset_buffers(MGSLPC_INFO *info)
3847 {
3848         RXBUF *buf;
3849         int i;
3850
3851         info->rx_put = 0;
3852         info->rx_get = 0;
3853         info->rx_frame_count = 0;
3854         for (i=0 ; i < info->rx_buf_count ; i++) {
3855                 buf = (RXBUF*)(info->rx_buf + (i * info->rx_buf_size));
3856                 buf->status = buf->count = 0;
3857         }
3858 }
3859
3860 /* Attempt to return a received HDLC frame
3861  * Only frames received without errors are returned.
3862  *
3863  * Returns 1 if frame returned, otherwise 0
3864  */
3865 static int rx_get_frame(MGSLPC_INFO *info)
3866 {
3867         unsigned short status;
3868         RXBUF *buf;
3869         unsigned int framesize = 0;
3870         unsigned long flags;
3871         struct tty_struct *tty = info->tty;
3872         int return_frame = 0;
3873
3874         if (info->rx_frame_count == 0)
3875                 return 0;
3876
3877         buf = (RXBUF*)(info->rx_buf + (info->rx_get * info->rx_buf_size));
3878
3879         status = buf->status;
3880
3881         /* 07  VFR  1=valid frame
3882          * 06  RDO  1=data overrun
3883          * 05  CRC  1=OK, 0=error
3884          * 04  RAB  1=frame aborted
3885          */
3886         if ((status & 0xf0) != 0xA0) {
3887                 if (!(status & BIT7) || (status & BIT4))
3888                         info->icount.rxabort++;
3889                 else if (status & BIT6)
3890                         info->icount.rxover++;
3891                 else if (!(status & BIT5)) {
3892                         info->icount.rxcrc++;
3893                         if (info->params.crc_type & HDLC_CRC_RETURN_EX)
3894                                 return_frame = 1;
3895                 }
3896                 framesize = 0;
3897 #if SYNCLINK_GENERIC_HDLC
3898                 {
3899                         struct net_device_stats *stats = hdlc_stats(info->netdev);
3900                         stats->rx_errors++;
3901                         stats->rx_frame_errors++;
3902                 }
3903 #endif
3904         } else
3905                 return_frame = 1;
3906
3907         if (return_frame)
3908                 framesize = buf->count;
3909
3910         if (debug_level >= DEBUG_LEVEL_BH)
3911                 printk("%s(%d):rx_get_frame(%s) status=%04X size=%d\n",
3912                         __FILE__,__LINE__,info->device_name,status,framesize);
3913
3914         if (debug_level >= DEBUG_LEVEL_DATA)
3915                 trace_block(info, buf->data, framesize, 0);
3916
3917         if (framesize) {
3918                 if ((info->params.crc_type & HDLC_CRC_RETURN_EX &&
3919                       framesize+1 > info->max_frame_size) ||
3920                     framesize > info->max_frame_size)
3921                         info->icount.rxlong++;
3922                 else {
3923                         if (status & BIT5)
3924                                 info->icount.rxok++;
3925
3926                         if (info->params.crc_type & HDLC_CRC_RETURN_EX) {
3927                                 *(buf->data + framesize) = status & BIT5 ? RX_OK:RX_CRC_ERROR;
3928                                 ++framesize;
3929                         }
3930
3931 #if SYNCLINK_GENERIC_HDLC
3932                         if (info->netcount)
3933                                 hdlcdev_rx(info, buf->data, framesize);
3934                         else
3935 #endif
3936                                 ldisc_receive_buf(tty, buf->data, info->flag_buf, framesize);
3937                 }
3938         }
3939
3940         spin_lock_irqsave(&info->lock,flags);
3941         buf->status = buf->count = 0;
3942         info->rx_frame_count--;
3943         info->rx_get++;
3944         if (info->rx_get >= info->rx_buf_count)
3945                 info->rx_get = 0;
3946         spin_unlock_irqrestore(&info->lock,flags);
3947
3948         return 1;
3949 }
3950
3951 static BOOLEAN register_test(MGSLPC_INFO *info)
3952 {
3953         static unsigned char patterns[] =
3954             { 0x00, 0xff, 0xaa, 0x55, 0x69, 0x96, 0x0f };
3955         static unsigned int count = ARRAY_SIZE(patterns);
3956         unsigned int i;
3957         BOOLEAN rc = TRUE;
3958         unsigned long flags;
3959
3960         spin_lock_irqsave(&info->lock,flags);
3961         reset_device(info);
3962
3963         for (i = 0; i < count; i++) {
3964                 write_reg(info, XAD1, patterns[i]);
3965                 write_reg(info, XAD2, patterns[(i + 1) % count]);
3966                 if ((read_reg(info, XAD1) != patterns[i]) ||
3967                     (read_reg(info, XAD2) != patterns[(i + 1) % count])) {
3968                         rc = FALSE;
3969                         break;
3970                 }
3971         }
3972
3973         spin_unlock_irqrestore(&info->lock,flags);
3974         return rc;
3975 }
3976
3977 static BOOLEAN irq_test(MGSLPC_INFO *info)
3978 {
3979         unsigned long end_time;
3980         unsigned long flags;
3981
3982         spin_lock_irqsave(&info->lock,flags);
3983         reset_device(info);
3984
3985         info->testing_irq = TRUE;
3986         hdlc_mode(info);
3987
3988         info->irq_occurred = FALSE;
3989
3990         /* init hdlc mode */
3991
3992         irq_enable(info, CHA, IRQ_TIMER);
3993         write_reg(info, CHA + TIMR, 0); /* 512 cycles */
3994         issue_command(info, CHA, CMD_START_TIMER);
3995
3996         spin_unlock_irqrestore(&info->lock,flags);
3997
3998         end_time=100;
3999         while(end_time-- && !info->irq_occurred) {
4000                 msleep_interruptible(10);
4001         }
4002
4003         info->testing_irq = FALSE;
4004
4005         spin_lock_irqsave(&info->lock,flags);
4006         reset_device(info);
4007         spin_unlock_irqrestore(&info->lock,flags);
4008
4009         return info->irq_occurred ? TRUE : FALSE;
4010 }
4011
4012 static int adapter_test(MGSLPC_INFO *info)
4013 {
4014         if (!register_test(info)) {
4015                 info->init_error = DiagStatus_AddressFailure;
4016                 printk( "%s(%d):Register test failure for device %s Addr=%04X\n",
4017                         __FILE__,__LINE__,info->device_name, (unsigned short)(info->io_base) );
4018                 return -ENODEV;
4019         }
4020
4021         if (!irq_test(info)) {
4022                 info->init_error = DiagStatus_IrqFailure;
4023                 printk( "%s(%d):Interrupt test failure for device %s IRQ=%d\n",
4024                         __FILE__,__LINE__,info->device_name, (unsigned short)(info->irq_level) );
4025                 return -ENODEV;
4026         }
4027
4028         if (debug_level >= DEBUG_LEVEL_INFO)
4029                 printk("%s(%d):device %s passed diagnostics\n",
4030                         __FILE__,__LINE__,info->device_name);
4031         return 0;
4032 }
4033
4034 static void trace_block(MGSLPC_INFO *info,const char* data, int count, int xmit)
4035 {
4036         int i;
4037         int linecount;
4038         if (xmit)
4039                 printk("%s tx data:\n",info->device_name);
4040         else
4041                 printk("%s rx data:\n",info->device_name);
4042
4043         while(count) {
4044                 if (count > 16)
4045                         linecount = 16;
4046                 else
4047                         linecount = count;
4048
4049                 for(i=0;i<linecount;i++)
4050                         printk("%02X ",(unsigned char)data[i]);
4051                 for(;i<17;i++)
4052                         printk("   ");
4053                 for(i=0;i<linecount;i++) {
4054                         if (data[i]>=040 && data[i]<=0176)
4055                                 printk("%c",data[i]);
4056                         else
4057                                 printk(".");
4058                 }
4059                 printk("\n");
4060
4061                 data  += linecount;
4062                 count -= linecount;
4063         }
4064 }
4065
4066 /* HDLC frame time out
4067  * update stats and do tx completion processing
4068  */
4069 static void tx_timeout(unsigned long context)
4070 {
4071         MGSLPC_INFO *info = (MGSLPC_INFO*)context;
4072         unsigned long flags;
4073
4074         if ( debug_level >= DEBUG_LEVEL_INFO )
4075                 printk( "%s(%d):tx_timeout(%s)\n",
4076                         __FILE__,__LINE__,info->device_name);
4077         if(info->tx_active &&
4078            info->params.mode == MGSL_MODE_HDLC) {
4079                 info->icount.txtimeout++;
4080         }
4081         spin_lock_irqsave(&info->lock,flags);
4082         info->tx_active = 0;
4083         info->tx_count = info->tx_put = info->tx_get = 0;
4084
4085         spin_unlock_irqrestore(&info->lock,flags);
4086
4087 #if SYNCLINK_GENERIC_HDLC
4088         if (info->netcount)
4089                 hdlcdev_tx_done(info);
4090         else
4091 #endif
4092                 bh_transmit(info);
4093 }
4094
4095 #if SYNCLINK_GENERIC_HDLC
4096
4097 /**
4098  * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
4099  * set encoding and frame check sequence (FCS) options
4100  *
4101  * dev       pointer to network device structure
4102  * encoding  serial encoding setting
4103  * parity    FCS setting
4104  *
4105  * returns 0 if success, otherwise error code
4106  */
4107 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
4108                           unsigned short parity)
4109 {
4110         MGSLPC_INFO *info = dev_to_port(dev);
4111         unsigned char  new_encoding;
4112         unsigned short new_crctype;
4113
4114         /* return error if TTY interface open */
4115         if (info->count)
4116                 return -EBUSY;
4117
4118         switch (encoding)
4119         {
4120         case ENCODING_NRZ:        new_encoding = HDLC_ENCODING_NRZ; break;
4121         case ENCODING_NRZI:       new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
4122         case ENCODING_FM_MARK:    new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
4123         case ENCODING_FM_SPACE:   new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
4124         case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
4125         default: return -EINVAL;
4126         }
4127
4128         switch (parity)
4129         {
4130         case PARITY_NONE:            new_crctype = HDLC_CRC_NONE; break;
4131         case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
4132         case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
4133         default: return -EINVAL;
4134         }
4135
4136         info->params.encoding = new_encoding;
4137         info->params.crc_type = new_crctype;
4138
4139         /* if network interface up, reprogram hardware */
4140         if (info->netcount)
4141                 mgslpc_program_hw(info);
4142
4143         return 0;
4144 }
4145
4146 /**
4147  * called by generic HDLC layer to send frame
4148  *
4149  * skb  socket buffer containing HDLC frame
4150  * dev  pointer to network device structure
4151  *
4152  * returns 0 if success, otherwise error code
4153  */
4154 static int hdlcdev_xmit(struct sk_buff *skb, struct net_device *dev)
4155 {
4156         MGSLPC_INFO *info = dev_to_port(dev);
4157         struct net_device_stats *stats = hdlc_stats(dev);
4158         unsigned long flags;
4159
4160         if (debug_level >= DEBUG_LEVEL_INFO)
4161                 printk(KERN_INFO "%s:hdlc_xmit(%s)\n",__FILE__,dev->name);
4162
4163         /* stop sending until this frame completes */
4164         netif_stop_queue(dev);
4165
4166         /* copy data to device buffers */
4167         skb_copy_from_linear_data(skb, info->tx_buf, skb->len);
4168         info->tx_get = 0;
4169         info->tx_put = info->tx_count = skb->len;
4170
4171         /* update network statistics */
4172         stats->tx_packets++;
4173         stats->tx_bytes += skb->len;
4174
4175         /* done with socket buffer, so free it */
4176         dev_kfree_skb(skb);
4177
4178         /* save start time for transmit timeout detection */
4179         dev->trans_start = jiffies;
4180
4181         /* start hardware transmitter if necessary */
4182         spin_lock_irqsave(&info->lock,flags);
4183         if (!info->tx_active)
4184                 tx_start(info);
4185         spin_unlock_irqrestore(&info->lock,flags);
4186
4187         return 0;
4188 }
4189
4190 /**
4191  * called by network layer when interface enabled
4192  * claim resources and initialize hardware
4193  *
4194  * dev  pointer to network device structure
4195  *
4196  * returns 0 if success, otherwise error code
4197  */
4198 static int hdlcdev_open(struct net_device *dev)
4199 {
4200         MGSLPC_INFO *info = dev_to_port(dev);
4201         int rc;
4202         unsigned long flags;
4203
4204         if (debug_level >= DEBUG_LEVEL_INFO)
4205                 printk("%s:hdlcdev_open(%s)\n",__FILE__,dev->name);
4206
4207         /* generic HDLC layer open processing */
4208         if ((rc = hdlc_open(dev)))
4209                 return rc;
4210
4211         /* arbitrate between network and tty opens */
4212         spin_lock_irqsave(&info->netlock, flags);
4213         if (info->count != 0 || info->netcount != 0) {
4214                 printk(KERN_WARNING "%s: hdlc_open returning busy\n", dev->name);
4215                 spin_unlock_irqrestore(&info->netlock, flags);
4216                 return -EBUSY;
4217         }
4218         info->netcount=1;
4219         spin_unlock_irqrestore(&info->netlock, flags);
4220
4221         /* claim resources and init adapter */
4222         if ((rc = startup(info)) != 0) {
4223                 spin_lock_irqsave(&info->netlock, flags);
4224                 info->netcount=0;
4225                 spin_unlock_irqrestore(&info->netlock, flags);
4226                 return rc;
4227         }
4228
4229         /* assert DTR and RTS, apply hardware settings */
4230         info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
4231         mgslpc_program_hw(info);
4232
4233         /* enable network layer transmit */
4234         dev->trans_start = jiffies;
4235         netif_start_queue(dev);
4236
4237         /* inform generic HDLC layer of current DCD status */
4238         spin_lock_irqsave(&info->lock, flags);
4239         get_signals(info);
4240         spin_unlock_irqrestore(&info->lock, flags);
4241         if (info->serial_signals & SerialSignal_DCD)
4242                 netif_carrier_on(dev);
4243         else
4244                 netif_carrier_off(dev);
4245         return 0;
4246 }
4247
4248 /**
4249  * called by network layer when interface is disabled
4250  * shutdown hardware and release resources
4251  *
4252  * dev  pointer to network device structure
4253  *
4254  * returns 0 if success, otherwise error code
4255  */
4256 static int hdlcdev_close(struct net_device *dev)
4257 {
4258         MGSLPC_INFO *info = dev_to_port(dev);
4259         unsigned long flags;
4260
4261         if (debug_level >= DEBUG_LEVEL_INFO)
4262                 printk("%s:hdlcdev_close(%s)\n",__FILE__,dev->name);
4263
4264         netif_stop_queue(dev);
4265
4266         /* shutdown adapter and release resources */
4267         shutdown(info);
4268
4269         hdlc_close(dev);
4270
4271         spin_lock_irqsave(&info->netlock, flags);
4272         info->netcount=0;
4273         spin_unlock_irqrestore(&info->netlock, flags);
4274
4275         return 0;
4276 }
4277
4278 /**
4279  * called by network layer to process IOCTL call to network device
4280  *
4281  * dev  pointer to network device structure
4282  * ifr  pointer to network interface request structure
4283  * cmd  IOCTL command code
4284  *
4285  * returns 0 if success, otherwise error code
4286  */
4287 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
4288 {
4289         const size_t size = sizeof(sync_serial_settings);
4290         sync_serial_settings new_line;
4291         sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
4292         MGSLPC_INFO *info = dev_to_port(dev);
4293         unsigned int flags;
4294
4295         if (debug_level >= DEBUG_LEVEL_INFO)
4296                 printk("%s:hdlcdev_ioctl(%s)\n",__FILE__,dev->name);
4297
4298         /* return error if TTY interface open */
4299         if (info->count)
4300                 return -EBUSY;
4301
4302         if (cmd != SIOCWANDEV)
4303                 return hdlc_ioctl(dev, ifr, cmd);
4304
4305         switch(ifr->ifr_settings.type) {
4306         case IF_GET_IFACE: /* return current sync_serial_settings */
4307
4308                 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
4309                 if (ifr->ifr_settings.size < size) {
4310                         ifr->ifr_settings.size = size; /* data size wanted */
4311                         return -ENOBUFS;
4312                 }
4313
4314                 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
4315                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
4316                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
4317                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
4318
4319                 switch (flags){
4320                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
4321                 case (HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_INT; break;
4322                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_TXINT; break;
4323                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
4324                 default: new_line.clock_type = CLOCK_DEFAULT;
4325                 }
4326
4327                 new_line.clock_rate = info->params.clock_speed;
4328                 new_line.loopback   = info->params.loopback ? 1:0;
4329
4330                 if (copy_to_user(line, &new_line, size))
4331                         return -EFAULT;
4332                 return 0;
4333
4334         case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
4335
4336                 if(!capable(CAP_NET_ADMIN))
4337                         return -EPERM;
4338                 if (copy_from_user(&new_line, line, size))
4339                         return -EFAULT;
4340
4341                 switch (new_line.clock_type)
4342                 {
4343                 case CLOCK_EXT:      flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
4344                 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
4345                 case CLOCK_INT:      flags = HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG;    break;
4346                 case CLOCK_TXINT:    flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG;    break;
4347                 case CLOCK_DEFAULT:  flags = info->params.flags &
4348                                              (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
4349                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
4350                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
4351                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN); break;
4352                 default: return -EINVAL;
4353                 }
4354
4355                 if (new_line.loopback != 0 && new_line.loopback != 1)
4356                         return -EINVAL;
4357
4358                 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
4359                                         HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
4360                                         HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
4361                                         HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
4362                 info->params.flags |= flags;
4363
4364                 info->params.loopback = new_line.loopback;
4365
4366                 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
4367                         info->params.clock_speed = new_line.clock_rate;
4368                 else
4369                         info->params.clock_speed = 0;
4370
4371                 /* if network interface up, reprogram hardware */
4372                 if (info->netcount)
4373                         mgslpc_program_hw(info);
4374                 return 0;
4375
4376         default:
4377                 return hdlc_ioctl(dev, ifr, cmd);
4378         }
4379 }
4380
4381 /**
4382  * called by network layer when transmit timeout is detected
4383  *
4384  * dev  pointer to network device structure
4385  */
4386 static void hdlcdev_tx_timeout(struct net_device *dev)
4387 {
4388         MGSLPC_INFO *info = dev_to_port(dev);
4389         struct net_device_stats *stats = hdlc_stats(dev);
4390         unsigned long flags;
4391
4392         if (debug_level >= DEBUG_LEVEL_INFO)
4393                 printk("hdlcdev_tx_timeout(%s)\n",dev->name);
4394
4395         stats->tx_errors++;
4396         stats->tx_aborted_errors++;
4397
4398         spin_lock_irqsave(&info->lock,flags);
4399         tx_stop(info);
4400         spin_unlock_irqrestore(&info->lock,flags);
4401
4402         netif_wake_queue(dev);
4403 }
4404
4405 /**
4406  * called by device driver when transmit completes
4407  * reenable network layer transmit if stopped
4408  *
4409  * info  pointer to device instance information
4410  */
4411 static void hdlcdev_tx_done(MGSLPC_INFO *info)
4412 {
4413         if (netif_queue_stopped(info->netdev))
4414                 netif_wake_queue(info->netdev);
4415 }
4416
4417 /**
4418  * called by device driver when frame received
4419  * pass frame to network layer
4420  *
4421  * info  pointer to device instance information
4422  * buf   pointer to buffer contianing frame data
4423  * size  count of data bytes in buf
4424  */
4425 static void hdlcdev_rx(MGSLPC_INFO *info, char *buf, int size)
4426 {
4427         struct sk_buff *skb = dev_alloc_skb(size);
4428         struct net_device *dev = info->netdev;
4429         struct net_device_stats *stats = hdlc_stats(dev);
4430
4431         if (debug_level >= DEBUG_LEVEL_INFO)
4432                 printk("hdlcdev_rx(%s)\n",dev->name);
4433
4434         if (skb == NULL) {
4435                 printk(KERN_NOTICE "%s: can't alloc skb, dropping packet\n", dev->name);
4436                 stats->rx_dropped++;
4437                 return;
4438         }
4439
4440         memcpy(skb_put(skb, size),buf,size);
4441
4442         skb->protocol = hdlc_type_trans(skb, info->netdev);
4443
4444         stats->rx_packets++;
4445         stats->rx_bytes += size;
4446
4447         netif_rx(skb);
4448
4449         info->netdev->last_rx = jiffies;
4450 }
4451
4452 /**
4453  * called by device driver when adding device instance
4454  * do generic HDLC initialization
4455  *
4456  * info  pointer to device instance information
4457  *
4458  * returns 0 if success, otherwise error code
4459  */
4460 static int hdlcdev_init(MGSLPC_INFO *info)
4461 {
4462         int rc;
4463         struct net_device *dev;
4464         hdlc_device *hdlc;
4465
4466         /* allocate and initialize network and HDLC layer objects */
4467
4468         if (!(dev = alloc_hdlcdev(info))) {
4469                 printk(KERN_ERR "%s:hdlc device allocation failure\n",__FILE__);
4470                 return -ENOMEM;
4471         }
4472
4473         /* for network layer reporting purposes only */
4474         dev->base_addr = info->io_base;
4475         dev->irq       = info->irq_level;
4476
4477         /* network layer callbacks and settings */
4478         dev->do_ioctl       = hdlcdev_ioctl;
4479         dev->open           = hdlcdev_open;
4480         dev->stop           = hdlcdev_close;
4481         dev->tx_timeout     = hdlcdev_tx_timeout;
4482         dev->watchdog_timeo = 10*HZ;
4483         dev->tx_queue_len   = 50;
4484
4485         /* generic HDLC layer callbacks and settings */
4486         hdlc         = dev_to_hdlc(dev);
4487         hdlc->attach = hdlcdev_attach;
4488         hdlc->xmit   = hdlcdev_xmit;
4489
4490         /* register objects with HDLC layer */
4491         if ((rc = register_hdlc_device(dev))) {
4492                 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
4493                 free_netdev(dev);
4494                 return rc;
4495         }
4496
4497         info->netdev = dev;
4498         return 0;
4499 }
4500
4501 /**
4502  * called by device driver when removing device instance
4503  * do generic HDLC cleanup
4504  *
4505  * info  pointer to device instance information
4506  */
4507 static void hdlcdev_exit(MGSLPC_INFO *info)
4508 {
4509         unregister_hdlc_device(info->netdev);
4510         free_netdev(info->netdev);
4511         info->netdev = NULL;
4512 }
4513
4514 #endif /* CONFIG_HDLC */
4515