Merge tag 'tty-3.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty
[~shefty/rdma-dev.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/seq_file.h>
55 #include <linux/slab.h>
56 #include <linux/netdevice.h>
57 #include <linux/vmalloc.h>
58 #include <linux/init.h>
59 #include <linux/delay.h>
60 #include <linux/ioctl.h>
61 #include <linux/synclink.h>
62
63 #include <asm/io.h>
64 #include <asm/irq.h>
65 #include <asm/dma.h>
66 #include <linux/bitops.h>
67 #include <asm/types.h>
68 #include <linux/termios.h>
69 #include <linux/workqueue.h>
70 #include <linux/hdlc.h>
71
72 #include <pcmcia/cistpl.h>
73 #include <pcmcia/cisreg.h>
74 #include <pcmcia/ds.h>
75
76 #if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINK_CS_MODULE))
77 #define SYNCLINK_GENERIC_HDLC 1
78 #else
79 #define SYNCLINK_GENERIC_HDLC 0
80 #endif
81
82 #define GET_USER(error,value,addr) error = get_user(value,addr)
83 #define COPY_FROM_USER(error,dest,src,size) error = copy_from_user(dest,src,size) ? -EFAULT : 0
84 #define PUT_USER(error,value,addr) error = put_user(value,addr)
85 #define COPY_TO_USER(error,dest,src,size) error = copy_to_user(dest,src,size) ? -EFAULT : 0
86
87 #include <asm/uaccess.h>
88
89 static MGSL_PARAMS default_params = {
90         MGSL_MODE_HDLC,                 /* unsigned long mode */
91         0,                              /* unsigned char loopback; */
92         HDLC_FLAG_UNDERRUN_ABORT15,     /* unsigned short flags; */
93         HDLC_ENCODING_NRZI_SPACE,       /* unsigned char encoding; */
94         0,                              /* unsigned long clock_speed; */
95         0xff,                           /* unsigned char addr_filter; */
96         HDLC_CRC_16_CCITT,              /* unsigned short crc_type; */
97         HDLC_PREAMBLE_LENGTH_8BITS,     /* unsigned char preamble_length; */
98         HDLC_PREAMBLE_PATTERN_NONE,     /* unsigned char preamble; */
99         9600,                           /* unsigned long data_rate; */
100         8,                              /* unsigned char data_bits; */
101         1,                              /* unsigned char stop_bits; */
102         ASYNC_PARITY_NONE               /* unsigned char parity; */
103 };
104
105 typedef struct
106 {
107         int count;
108         unsigned char status;
109         char data[1];
110 } RXBUF;
111
112 /* The queue of BH actions to be performed */
113
114 #define BH_RECEIVE  1
115 #define BH_TRANSMIT 2
116 #define BH_STATUS   4
117
118 #define IO_PIN_SHUTDOWN_LIMIT 100
119
120 #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
121
122 struct _input_signal_events {
123         int     ri_up;
124         int     ri_down;
125         int     dsr_up;
126         int     dsr_down;
127         int     dcd_up;
128         int     dcd_down;
129         int     cts_up;
130         int     cts_down;
131 };
132
133
134 /*
135  * Device instance data structure
136  */
137
138 typedef struct _mgslpc_info {
139         struct tty_port         port;
140         void *if_ptr;   /* General purpose pointer (used by SPPP) */
141         int                     magic;
142         int                     line;
143
144         struct mgsl_icount      icount;
145
146         int                     timeout;
147         int                     x_char;         /* xon/xoff character */
148         unsigned char           read_status_mask;
149         unsigned char           ignore_status_mask;
150
151         unsigned char *tx_buf;
152         int            tx_put;
153         int            tx_get;
154         int            tx_count;
155
156         /* circular list of fixed length rx buffers */
157
158         unsigned char  *rx_buf;        /* memory allocated for all rx buffers */
159         int            rx_buf_total_size; /* size of memory allocated for rx buffers */
160         int            rx_put;         /* index of next empty rx buffer */
161         int            rx_get;         /* index of next full rx buffer */
162         int            rx_buf_size;    /* size in bytes of single rx buffer */
163         int            rx_buf_count;   /* total number of rx buffers */
164         int            rx_frame_count; /* number of full rx buffers */
165
166         wait_queue_head_t       status_event_wait_q;
167         wait_queue_head_t       event_wait_q;
168         struct timer_list       tx_timer;       /* HDLC transmit timeout timer */
169         struct _mgslpc_info     *next_device;   /* device list link */
170
171         unsigned short imra_value;
172         unsigned short imrb_value;
173         unsigned char  pim_value;
174
175         spinlock_t lock;
176         struct work_struct task;                /* task structure for scheduling bh */
177
178         u32 max_frame_size;
179
180         u32 pending_bh;
181
182         bool bh_running;
183         bool bh_requested;
184
185         int dcd_chkcount; /* check counts to prevent */
186         int cts_chkcount; /* too many IRQs if a signal */
187         int dsr_chkcount; /* is floating */
188         int ri_chkcount;
189
190         bool rx_enabled;
191         bool rx_overflow;
192
193         bool tx_enabled;
194         bool tx_active;
195         bool tx_aborting;
196         u32 idle_mode;
197
198         int if_mode; /* serial interface selection (RS-232, v.35 etc) */
199
200         char device_name[25];           /* device instance name */
201
202         unsigned int io_base;   /* base I/O address of adapter */
203         unsigned int irq_level;
204
205         MGSL_PARAMS params;             /* communications parameters */
206
207         unsigned char serial_signals;   /* current serial signal states */
208
209         bool irq_occurred;              /* for diagnostics use */
210         char testing_irq;
211         unsigned int init_error;        /* startup error (DIAGS)        */
212
213         char *flag_buf;
214         bool drop_rts_on_tx_done;
215
216         struct  _input_signal_events    input_signal_events;
217
218         /* PCMCIA support */
219         struct pcmcia_device    *p_dev;
220         int                   stop;
221
222         /* SPPP/Cisco HDLC device parts */
223         int netcount;
224         spinlock_t netlock;
225
226 #if SYNCLINK_GENERIC_HDLC
227         struct net_device *netdev;
228 #endif
229
230 } MGSLPC_INFO;
231
232 #define MGSLPC_MAGIC 0x5402
233
234 /*
235  * The size of the serial xmit buffer is 1 page, or 4096 bytes
236  */
237 #define TXBUFSIZE 4096
238
239
240 #define CHA     0x00   /* channel A offset */
241 #define CHB     0x40   /* channel B offset */
242
243 /*
244  *  FIXME: PPC has PVR defined in asm/reg.h.  For now we just undef it.
245  */
246 #undef PVR
247
248 #define RXFIFO  0
249 #define TXFIFO  0
250 #define STAR    0x20
251 #define CMDR    0x20
252 #define RSTA    0x21
253 #define PRE     0x21
254 #define MODE    0x22
255 #define TIMR    0x23
256 #define XAD1    0x24
257 #define XAD2    0x25
258 #define RAH1    0x26
259 #define RAH2    0x27
260 #define DAFO    0x27
261 #define RAL1    0x28
262 #define RFC     0x28
263 #define RHCR    0x29
264 #define RAL2    0x29
265 #define RBCL    0x2a
266 #define XBCL    0x2a
267 #define RBCH    0x2b
268 #define XBCH    0x2b
269 #define CCR0    0x2c
270 #define CCR1    0x2d
271 #define CCR2    0x2e
272 #define CCR3    0x2f
273 #define VSTR    0x34
274 #define BGR     0x34
275 #define RLCR    0x35
276 #define AML     0x36
277 #define AMH     0x37
278 #define GIS     0x38
279 #define IVA     0x38
280 #define IPC     0x39
281 #define ISR     0x3a
282 #define IMR     0x3a
283 #define PVR     0x3c
284 #define PIS     0x3d
285 #define PIM     0x3d
286 #define PCR     0x3e
287 #define CCR4    0x3f
288
289 // IMR/ISR
290
291 #define IRQ_BREAK_ON    BIT15   // rx break detected
292 #define IRQ_DATAOVERRUN BIT14   // receive data overflow
293 #define IRQ_ALLSENT     BIT13   // all sent
294 #define IRQ_UNDERRUN    BIT12   // transmit data underrun
295 #define IRQ_TIMER       BIT11   // timer interrupt
296 #define IRQ_CTS         BIT10   // CTS status change
297 #define IRQ_TXREPEAT    BIT9    // tx message repeat
298 #define IRQ_TXFIFO      BIT8    // transmit pool ready
299 #define IRQ_RXEOM       BIT7    // receive message end
300 #define IRQ_EXITHUNT    BIT6    // receive frame start
301 #define IRQ_RXTIME      BIT6    // rx char timeout
302 #define IRQ_DCD         BIT2    // carrier detect status change
303 #define IRQ_OVERRUN     BIT1    // receive frame overflow
304 #define IRQ_RXFIFO      BIT0    // receive pool full
305
306 // STAR
307
308 #define XFW   BIT6              // transmit FIFO write enable
309 #define CEC   BIT2              // command executing
310 #define CTS   BIT1              // CTS state
311
312 #define PVR_DTR      BIT0
313 #define PVR_DSR      BIT1
314 #define PVR_RI       BIT2
315 #define PVR_AUTOCTS  BIT3
316 #define PVR_RS232    0x20   /* 0010b */
317 #define PVR_V35      0xe0   /* 1110b */
318 #define PVR_RS422    0x40   /* 0100b */
319
320 /* Register access functions */
321
322 #define write_reg(info, reg, val) outb((val),(info)->io_base + (reg))
323 #define read_reg(info, reg) inb((info)->io_base + (reg))
324
325 #define read_reg16(info, reg) inw((info)->io_base + (reg))
326 #define write_reg16(info, reg, val) outw((val), (info)->io_base + (reg))
327
328 #define set_reg_bits(info, reg, mask) \
329     write_reg(info, (reg), \
330                  (unsigned char) (read_reg(info, (reg)) | (mask)))
331 #define clear_reg_bits(info, reg, mask) \
332     write_reg(info, (reg), \
333                  (unsigned char) (read_reg(info, (reg)) & ~(mask)))
334 /*
335  * interrupt enable/disable routines
336  */
337 static void irq_disable(MGSLPC_INFO *info, unsigned char channel, unsigned short mask)
338 {
339         if (channel == CHA) {
340                 info->imra_value |= mask;
341                 write_reg16(info, CHA + IMR, info->imra_value);
342         } else {
343                 info->imrb_value |= mask;
344                 write_reg16(info, CHB + IMR, info->imrb_value);
345         }
346 }
347 static void irq_enable(MGSLPC_INFO *info, unsigned char channel, unsigned short mask)
348 {
349         if (channel == CHA) {
350                 info->imra_value &= ~mask;
351                 write_reg16(info, CHA + IMR, info->imra_value);
352         } else {
353                 info->imrb_value &= ~mask;
354                 write_reg16(info, CHB + IMR, info->imrb_value);
355         }
356 }
357
358 #define port_irq_disable(info, mask) \
359   { info->pim_value |= (mask); write_reg(info, PIM, info->pim_value); }
360
361 #define port_irq_enable(info, mask) \
362   { info->pim_value &= ~(mask); write_reg(info, PIM, info->pim_value); }
363
364 static void rx_start(MGSLPC_INFO *info);
365 static void rx_stop(MGSLPC_INFO *info);
366
367 static void tx_start(MGSLPC_INFO *info, struct tty_struct *tty);
368 static void tx_stop(MGSLPC_INFO *info);
369 static void tx_set_idle(MGSLPC_INFO *info);
370
371 static void get_signals(MGSLPC_INFO *info);
372 static void set_signals(MGSLPC_INFO *info);
373
374 static void reset_device(MGSLPC_INFO *info);
375
376 static void hdlc_mode(MGSLPC_INFO *info);
377 static void async_mode(MGSLPC_INFO *info);
378
379 static void tx_timeout(unsigned long context);
380
381 static int carrier_raised(struct tty_port *port);
382 static void dtr_rts(struct tty_port *port, int onoff);
383
384 #if SYNCLINK_GENERIC_HDLC
385 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
386 static void hdlcdev_tx_done(MGSLPC_INFO *info);
387 static void hdlcdev_rx(MGSLPC_INFO *info, char *buf, int size);
388 static int  hdlcdev_init(MGSLPC_INFO *info);
389 static void hdlcdev_exit(MGSLPC_INFO *info);
390 #endif
391
392 static void trace_block(MGSLPC_INFO *info,const char* data, int count, int xmit);
393
394 static bool register_test(MGSLPC_INFO *info);
395 static bool irq_test(MGSLPC_INFO *info);
396 static int adapter_test(MGSLPC_INFO *info);
397
398 static int claim_resources(MGSLPC_INFO *info);
399 static void release_resources(MGSLPC_INFO *info);
400 static void mgslpc_add_device(MGSLPC_INFO *info);
401 static void mgslpc_remove_device(MGSLPC_INFO *info);
402
403 static bool rx_get_frame(MGSLPC_INFO *info, struct tty_struct *tty);
404 static void rx_reset_buffers(MGSLPC_INFO *info);
405 static int  rx_alloc_buffers(MGSLPC_INFO *info);
406 static void rx_free_buffers(MGSLPC_INFO *info);
407
408 static irqreturn_t mgslpc_isr(int irq, void *dev_id);
409
410 /*
411  * Bottom half interrupt handlers
412  */
413 static void bh_handler(struct work_struct *work);
414 static void bh_transmit(MGSLPC_INFO *info, struct tty_struct *tty);
415 static void bh_status(MGSLPC_INFO *info);
416
417 /*
418  * ioctl handlers
419  */
420 static int tiocmget(struct tty_struct *tty);
421 static int tiocmset(struct tty_struct *tty,
422                                         unsigned int set, unsigned int clear);
423 static int get_stats(MGSLPC_INFO *info, struct mgsl_icount __user *user_icount);
424 static int get_params(MGSLPC_INFO *info, MGSL_PARAMS __user *user_params);
425 static int set_params(MGSLPC_INFO *info, MGSL_PARAMS __user *new_params, struct tty_struct *tty);
426 static int get_txidle(MGSLPC_INFO *info, int __user *idle_mode);
427 static int set_txidle(MGSLPC_INFO *info, int idle_mode);
428 static int set_txenable(MGSLPC_INFO *info, int enable, struct tty_struct *tty);
429 static int tx_abort(MGSLPC_INFO *info);
430 static int set_rxenable(MGSLPC_INFO *info, int enable);
431 static int wait_events(MGSLPC_INFO *info, int __user *mask);
432
433 static MGSLPC_INFO *mgslpc_device_list = NULL;
434 static int mgslpc_device_count = 0;
435
436 /*
437  * Set this param to non-zero to load eax with the
438  * .text section address and breakpoint on module load.
439  * This is useful for use with gdb and add-symbol-file command.
440  */
441 static bool break_on_load=0;
442
443 /*
444  * Driver major number, defaults to zero to get auto
445  * assigned major number. May be forced as module parameter.
446  */
447 static int ttymajor=0;
448
449 static int debug_level = 0;
450 static int maxframe[MAX_DEVICE_COUNT] = {0,};
451
452 module_param(break_on_load, bool, 0);
453 module_param(ttymajor, int, 0);
454 module_param(debug_level, int, 0);
455 module_param_array(maxframe, int, NULL, 0);
456
457 MODULE_LICENSE("GPL");
458
459 static char *driver_name = "SyncLink PC Card driver";
460 static char *driver_version = "$Revision: 4.34 $";
461
462 static struct tty_driver *serial_driver;
463
464 /* number of characters left in xmit buffer before we ask for more */
465 #define WAKEUP_CHARS 256
466
467 static void mgslpc_change_params(MGSLPC_INFO *info, struct tty_struct *tty);
468 static void mgslpc_wait_until_sent(struct tty_struct *tty, int timeout);
469
470 /* PCMCIA prototypes */
471
472 static int mgslpc_config(struct pcmcia_device *link);
473 static void mgslpc_release(u_long arg);
474 static void mgslpc_detach(struct pcmcia_device *p_dev);
475
476 /*
477  * 1st function defined in .text section. Calling this function in
478  * init_module() followed by a breakpoint allows a remote debugger
479  * (gdb) to get the .text address for the add-symbol-file command.
480  * This allows remote debugging of dynamically loadable modules.
481  */
482 static void* mgslpc_get_text_ptr(void)
483 {
484         return mgslpc_get_text_ptr;
485 }
486
487 /**
488  * line discipline callback wrappers
489  *
490  * The wrappers maintain line discipline references
491  * while calling into the line discipline.
492  *
493  * ldisc_receive_buf  - pass receive data to line discipline
494  */
495
496 static void ldisc_receive_buf(struct tty_struct *tty,
497                               const __u8 *data, char *flags, int count)
498 {
499         struct tty_ldisc *ld;
500         if (!tty)
501                 return;
502         ld = tty_ldisc_ref(tty);
503         if (ld) {
504                 if (ld->ops->receive_buf)
505                         ld->ops->receive_buf(tty, data, flags, count);
506                 tty_ldisc_deref(ld);
507         }
508 }
509
510 static const struct tty_port_operations mgslpc_port_ops = {
511         .carrier_raised = carrier_raised,
512         .dtr_rts = dtr_rts
513 };
514
515 static int mgslpc_probe(struct pcmcia_device *link)
516 {
517     MGSLPC_INFO *info;
518     int ret;
519
520     if (debug_level >= DEBUG_LEVEL_INFO)
521             printk("mgslpc_attach\n");
522
523     info = kzalloc(sizeof(MGSLPC_INFO), GFP_KERNEL);
524     if (!info) {
525             printk("Error can't allocate device instance data\n");
526             return -ENOMEM;
527     }
528
529     info->magic = MGSLPC_MAGIC;
530     tty_port_init(&info->port);
531     info->port.ops = &mgslpc_port_ops;
532     INIT_WORK(&info->task, bh_handler);
533     info->max_frame_size = 4096;
534     info->port.close_delay = 5*HZ/10;
535     info->port.closing_wait = 30*HZ;
536     init_waitqueue_head(&info->status_event_wait_q);
537     init_waitqueue_head(&info->event_wait_q);
538     spin_lock_init(&info->lock);
539     spin_lock_init(&info->netlock);
540     memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
541     info->idle_mode = HDLC_TXIDLE_FLAGS;
542     info->imra_value = 0xffff;
543     info->imrb_value = 0xffff;
544     info->pim_value = 0xff;
545
546     info->p_dev = link;
547     link->priv = info;
548
549     /* Initialize the struct pcmcia_device structure */
550
551     ret = mgslpc_config(link);
552     if (ret) {
553             tty_port_destroy(&info->port);
554             return ret;
555     }
556
557     mgslpc_add_device(info);
558
559     return 0;
560 }
561
562 /* Card has been inserted.
563  */
564
565 static int mgslpc_ioprobe(struct pcmcia_device *p_dev, void *priv_data)
566 {
567         return pcmcia_request_io(p_dev);
568 }
569
570 static int mgslpc_config(struct pcmcia_device *link)
571 {
572     MGSLPC_INFO *info = link->priv;
573     int ret;
574
575     if (debug_level >= DEBUG_LEVEL_INFO)
576             printk("mgslpc_config(0x%p)\n", link);
577
578     link->config_flags |= CONF_ENABLE_IRQ | CONF_AUTO_SET_IO;
579
580     ret = pcmcia_loop_config(link, mgslpc_ioprobe, NULL);
581     if (ret != 0)
582             goto failed;
583
584     link->config_index = 8;
585     link->config_regs = PRESENT_OPTION;
586
587     ret = pcmcia_request_irq(link, mgslpc_isr);
588     if (ret)
589             goto failed;
590     ret = pcmcia_enable_device(link);
591     if (ret)
592             goto failed;
593
594     info->io_base = link->resource[0]->start;
595     info->irq_level = link->irq;
596     return 0;
597
598 failed:
599     mgslpc_release((u_long)link);
600     return -ENODEV;
601 }
602
603 /* Card has been removed.
604  * Unregister device and release PCMCIA configuration.
605  * If device is open, postpone until it is closed.
606  */
607 static void mgslpc_release(u_long arg)
608 {
609         struct pcmcia_device *link = (struct pcmcia_device *)arg;
610
611         if (debug_level >= DEBUG_LEVEL_INFO)
612                 printk("mgslpc_release(0x%p)\n", link);
613
614         pcmcia_disable_device(link);
615 }
616
617 static void mgslpc_detach(struct pcmcia_device *link)
618 {
619         if (debug_level >= DEBUG_LEVEL_INFO)
620                 printk("mgslpc_detach(0x%p)\n", link);
621
622         ((MGSLPC_INFO *)link->priv)->stop = 1;
623         mgslpc_release((u_long)link);
624
625         mgslpc_remove_device((MGSLPC_INFO *)link->priv);
626 }
627
628 static int mgslpc_suspend(struct pcmcia_device *link)
629 {
630         MGSLPC_INFO *info = link->priv;
631
632         info->stop = 1;
633
634         return 0;
635 }
636
637 static int mgslpc_resume(struct pcmcia_device *link)
638 {
639         MGSLPC_INFO *info = link->priv;
640
641         info->stop = 0;
642
643         return 0;
644 }
645
646
647 static inline bool mgslpc_paranoia_check(MGSLPC_INFO *info,
648                                         char *name, const char *routine)
649 {
650 #ifdef MGSLPC_PARANOIA_CHECK
651         static const char *badmagic =
652                 "Warning: bad magic number for mgsl struct (%s) in %s\n";
653         static const char *badinfo =
654                 "Warning: null mgslpc_info for (%s) in %s\n";
655
656         if (!info) {
657                 printk(badinfo, name, routine);
658                 return true;
659         }
660         if (info->magic != MGSLPC_MAGIC) {
661                 printk(badmagic, name, routine);
662                 return true;
663         }
664 #else
665         if (!info)
666                 return true;
667 #endif
668         return false;
669 }
670
671
672 #define CMD_RXFIFO      BIT7    // release current rx FIFO
673 #define CMD_RXRESET     BIT6    // receiver reset
674 #define CMD_RXFIFO_READ BIT5
675 #define CMD_START_TIMER BIT4
676 #define CMD_TXFIFO      BIT3    // release current tx FIFO
677 #define CMD_TXEOM       BIT1    // transmit end message
678 #define CMD_TXRESET     BIT0    // transmit reset
679
680 static bool wait_command_complete(MGSLPC_INFO *info, unsigned char channel)
681 {
682         int i = 0;
683         /* wait for command completion */
684         while (read_reg(info, (unsigned char)(channel+STAR)) & BIT2) {
685                 udelay(1);
686                 if (i++ == 1000)
687                         return false;
688         }
689         return true;
690 }
691
692 static void issue_command(MGSLPC_INFO *info, unsigned char channel, unsigned char cmd)
693 {
694         wait_command_complete(info, channel);
695         write_reg(info, (unsigned char) (channel + CMDR), cmd);
696 }
697
698 static void tx_pause(struct tty_struct *tty)
699 {
700         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
701         unsigned long flags;
702
703         if (mgslpc_paranoia_check(info, tty->name, "tx_pause"))
704                 return;
705         if (debug_level >= DEBUG_LEVEL_INFO)
706                 printk("tx_pause(%s)\n",info->device_name);
707
708         spin_lock_irqsave(&info->lock,flags);
709         if (info->tx_enabled)
710                 tx_stop(info);
711         spin_unlock_irqrestore(&info->lock,flags);
712 }
713
714 static void tx_release(struct tty_struct *tty)
715 {
716         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
717         unsigned long flags;
718
719         if (mgslpc_paranoia_check(info, tty->name, "tx_release"))
720                 return;
721         if (debug_level >= DEBUG_LEVEL_INFO)
722                 printk("tx_release(%s)\n",info->device_name);
723
724         spin_lock_irqsave(&info->lock,flags);
725         if (!info->tx_enabled)
726                 tx_start(info, tty);
727         spin_unlock_irqrestore(&info->lock,flags);
728 }
729
730 /* Return next bottom half action to perform.
731  * or 0 if nothing to do.
732  */
733 static int bh_action(MGSLPC_INFO *info)
734 {
735         unsigned long flags;
736         int rc = 0;
737
738         spin_lock_irqsave(&info->lock,flags);
739
740         if (info->pending_bh & BH_RECEIVE) {
741                 info->pending_bh &= ~BH_RECEIVE;
742                 rc = BH_RECEIVE;
743         } else if (info->pending_bh & BH_TRANSMIT) {
744                 info->pending_bh &= ~BH_TRANSMIT;
745                 rc = BH_TRANSMIT;
746         } else if (info->pending_bh & BH_STATUS) {
747                 info->pending_bh &= ~BH_STATUS;
748                 rc = BH_STATUS;
749         }
750
751         if (!rc) {
752                 /* Mark BH routine as complete */
753                 info->bh_running = false;
754                 info->bh_requested = false;
755         }
756
757         spin_unlock_irqrestore(&info->lock,flags);
758
759         return rc;
760 }
761
762 static void bh_handler(struct work_struct *work)
763 {
764         MGSLPC_INFO *info = container_of(work, MGSLPC_INFO, task);
765         struct tty_struct *tty;
766         int action;
767
768         if (debug_level >= DEBUG_LEVEL_BH)
769                 printk( "%s(%d):bh_handler(%s) entry\n",
770                         __FILE__,__LINE__,info->device_name);
771
772         info->bh_running = true;
773         tty = tty_port_tty_get(&info->port);
774
775         while((action = bh_action(info)) != 0) {
776
777                 /* Process work item */
778                 if ( debug_level >= DEBUG_LEVEL_BH )
779                         printk( "%s(%d):bh_handler() work item action=%d\n",
780                                 __FILE__,__LINE__,action);
781
782                 switch (action) {
783
784                 case BH_RECEIVE:
785                         while(rx_get_frame(info, tty));
786                         break;
787                 case BH_TRANSMIT:
788                         bh_transmit(info, tty);
789                         break;
790                 case BH_STATUS:
791                         bh_status(info);
792                         break;
793                 default:
794                         /* unknown work item ID */
795                         printk("Unknown work item ID=%08X!\n", action);
796                         break;
797                 }
798         }
799
800         tty_kref_put(tty);
801         if (debug_level >= DEBUG_LEVEL_BH)
802                 printk( "%s(%d):bh_handler(%s) exit\n",
803                         __FILE__,__LINE__,info->device_name);
804 }
805
806 static void bh_transmit(MGSLPC_INFO *info, struct tty_struct *tty)
807 {
808         if (debug_level >= DEBUG_LEVEL_BH)
809                 printk("bh_transmit() entry on %s\n", info->device_name);
810
811         if (tty)
812                 tty_wakeup(tty);
813 }
814
815 static void bh_status(MGSLPC_INFO *info)
816 {
817         info->ri_chkcount = 0;
818         info->dsr_chkcount = 0;
819         info->dcd_chkcount = 0;
820         info->cts_chkcount = 0;
821 }
822
823 /* eom: non-zero = end of frame */
824 static void rx_ready_hdlc(MGSLPC_INFO *info, int eom)
825 {
826         unsigned char data[2];
827         unsigned char fifo_count, read_count, i;
828         RXBUF *buf = (RXBUF*)(info->rx_buf + (info->rx_put * info->rx_buf_size));
829
830         if (debug_level >= DEBUG_LEVEL_ISR)
831                 printk("%s(%d):rx_ready_hdlc(eom=%d)\n",__FILE__,__LINE__,eom);
832
833         if (!info->rx_enabled)
834                 return;
835
836         if (info->rx_frame_count >= info->rx_buf_count) {
837                 /* no more free buffers */
838                 issue_command(info, CHA, CMD_RXRESET);
839                 info->pending_bh |= BH_RECEIVE;
840                 info->rx_overflow = true;
841                 info->icount.buf_overrun++;
842                 return;
843         }
844
845         if (eom) {
846                 /* end of frame, get FIFO count from RBCL register */
847                 if (!(fifo_count = (unsigned char)(read_reg(info, CHA+RBCL) & 0x1f)))
848                         fifo_count = 32;
849         } else
850                 fifo_count = 32;
851
852         do {
853                 if (fifo_count == 1) {
854                         read_count = 1;
855                         data[0] = read_reg(info, CHA + RXFIFO);
856                 } else {
857                         read_count = 2;
858                         *((unsigned short *) data) = read_reg16(info, CHA + RXFIFO);
859                 }
860                 fifo_count -= read_count;
861                 if (!fifo_count && eom)
862                         buf->status = data[--read_count];
863
864                 for (i = 0; i < read_count; i++) {
865                         if (buf->count >= info->max_frame_size) {
866                                 /* frame too large, reset receiver and reset current buffer */
867                                 issue_command(info, CHA, CMD_RXRESET);
868                                 buf->count = 0;
869                                 return;
870                         }
871                         *(buf->data + buf->count) = data[i];
872                         buf->count++;
873                 }
874         } while (fifo_count);
875
876         if (eom) {
877                 info->pending_bh |= BH_RECEIVE;
878                 info->rx_frame_count++;
879                 info->rx_put++;
880                 if (info->rx_put >= info->rx_buf_count)
881                         info->rx_put = 0;
882         }
883         issue_command(info, CHA, CMD_RXFIFO);
884 }
885
886 static void rx_ready_async(MGSLPC_INFO *info, int tcd)
887 {
888         struct tty_port *port = &info->port;
889         unsigned char data, status, flag;
890         int fifo_count;
891         int work = 0;
892         struct mgsl_icount *icount = &info->icount;
893
894         if (tcd) {
895                 /* early termination, get FIFO count from RBCL register */
896                 fifo_count = (unsigned char)(read_reg(info, CHA+RBCL) & 0x1f);
897
898                 /* Zero fifo count could mean 0 or 32 bytes available.
899                  * If BIT5 of STAR is set then at least 1 byte is available.
900                  */
901                 if (!fifo_count && (read_reg(info,CHA+STAR) & BIT5))
902                         fifo_count = 32;
903         } else
904                 fifo_count = 32;
905
906         tty_buffer_request_room(port, fifo_count);
907         /* Flush received async data to receive data buffer. */
908         while (fifo_count) {
909                 data   = read_reg(info, CHA + RXFIFO);
910                 status = read_reg(info, CHA + RXFIFO);
911                 fifo_count -= 2;
912
913                 icount->rx++;
914                 flag = TTY_NORMAL;
915
916                 // if no frameing/crc error then save data
917                 // BIT7:parity error
918                 // BIT6:framing error
919
920                 if (status & (BIT7 + BIT6)) {
921                         if (status & BIT7)
922                                 icount->parity++;
923                         else
924                                 icount->frame++;
925
926                         /* discard char if tty control flags say so */
927                         if (status & info->ignore_status_mask)
928                                 continue;
929
930                         status &= info->read_status_mask;
931
932                         if (status & BIT7)
933                                 flag = TTY_PARITY;
934                         else if (status & BIT6)
935                                 flag = TTY_FRAME;
936                 }
937                 work += tty_insert_flip_char(port, data, flag);
938         }
939         issue_command(info, CHA, CMD_RXFIFO);
940
941         if (debug_level >= DEBUG_LEVEL_ISR) {
942                 printk("%s(%d):rx_ready_async",
943                         __FILE__,__LINE__);
944                 printk("%s(%d):rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
945                         __FILE__,__LINE__,icount->rx,icount->brk,
946                         icount->parity,icount->frame,icount->overrun);
947         }
948
949         if (work)
950                 tty_flip_buffer_push(port);
951 }
952
953
954 static void tx_done(MGSLPC_INFO *info, struct tty_struct *tty)
955 {
956         if (!info->tx_active)
957                 return;
958
959         info->tx_active = false;
960         info->tx_aborting = false;
961
962         if (info->params.mode == MGSL_MODE_ASYNC)
963                 return;
964
965         info->tx_count = info->tx_put = info->tx_get = 0;
966         del_timer(&info->tx_timer);
967
968         if (info->drop_rts_on_tx_done) {
969                 get_signals(info);
970                 if (info->serial_signals & SerialSignal_RTS) {
971                         info->serial_signals &= ~SerialSignal_RTS;
972                         set_signals(info);
973                 }
974                 info->drop_rts_on_tx_done = false;
975         }
976
977 #if SYNCLINK_GENERIC_HDLC
978         if (info->netcount)
979                 hdlcdev_tx_done(info);
980         else
981 #endif
982         {
983                 if (tty && (tty->stopped || tty->hw_stopped)) {
984                         tx_stop(info);
985                         return;
986                 }
987                 info->pending_bh |= BH_TRANSMIT;
988         }
989 }
990
991 static void tx_ready(MGSLPC_INFO *info, struct tty_struct *tty)
992 {
993         unsigned char fifo_count = 32;
994         int c;
995
996         if (debug_level >= DEBUG_LEVEL_ISR)
997                 printk("%s(%d):tx_ready(%s)\n", __FILE__,__LINE__,info->device_name);
998
999         if (info->params.mode == MGSL_MODE_HDLC) {
1000                 if (!info->tx_active)
1001                         return;
1002         } else {
1003                 if (tty && (tty->stopped || tty->hw_stopped)) {
1004                         tx_stop(info);
1005                         return;
1006                 }
1007                 if (!info->tx_count)
1008                         info->tx_active = false;
1009         }
1010
1011         if (!info->tx_count)
1012                 return;
1013
1014         while (info->tx_count && fifo_count) {
1015                 c = min(2, min_t(int, fifo_count, min(info->tx_count, TXBUFSIZE - info->tx_get)));
1016
1017                 if (c == 1) {
1018                         write_reg(info, CHA + TXFIFO, *(info->tx_buf + info->tx_get));
1019                 } else {
1020                         write_reg16(info, CHA + TXFIFO,
1021                                           *((unsigned short*)(info->tx_buf + info->tx_get)));
1022                 }
1023                 info->tx_count -= c;
1024                 info->tx_get = (info->tx_get + c) & (TXBUFSIZE - 1);
1025                 fifo_count -= c;
1026         }
1027
1028         if (info->params.mode == MGSL_MODE_ASYNC) {
1029                 if (info->tx_count < WAKEUP_CHARS)
1030                         info->pending_bh |= BH_TRANSMIT;
1031                 issue_command(info, CHA, CMD_TXFIFO);
1032         } else {
1033                 if (info->tx_count)
1034                         issue_command(info, CHA, CMD_TXFIFO);
1035                 else
1036                         issue_command(info, CHA, CMD_TXFIFO + CMD_TXEOM);
1037         }
1038 }
1039
1040 static void cts_change(MGSLPC_INFO *info, struct tty_struct *tty)
1041 {
1042         get_signals(info);
1043         if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1044                 irq_disable(info, CHB, IRQ_CTS);
1045         info->icount.cts++;
1046         if (info->serial_signals & SerialSignal_CTS)
1047                 info->input_signal_events.cts_up++;
1048         else
1049                 info->input_signal_events.cts_down++;
1050         wake_up_interruptible(&info->status_event_wait_q);
1051         wake_up_interruptible(&info->event_wait_q);
1052
1053         if (tty && tty_port_cts_enabled(&info->port)) {
1054                 if (tty->hw_stopped) {
1055                         if (info->serial_signals & SerialSignal_CTS) {
1056                                 if (debug_level >= DEBUG_LEVEL_ISR)
1057                                         printk("CTS tx start...");
1058                                 tty->hw_stopped = 0;
1059                                 tx_start(info, tty);
1060                                 info->pending_bh |= BH_TRANSMIT;
1061                                 return;
1062                         }
1063                 } else {
1064                         if (!(info->serial_signals & SerialSignal_CTS)) {
1065                                 if (debug_level >= DEBUG_LEVEL_ISR)
1066                                         printk("CTS tx stop...");
1067                                 tty->hw_stopped = 1;
1068                                 tx_stop(info);
1069                         }
1070                 }
1071         }
1072         info->pending_bh |= BH_STATUS;
1073 }
1074
1075 static void dcd_change(MGSLPC_INFO *info, struct tty_struct *tty)
1076 {
1077         get_signals(info);
1078         if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1079                 irq_disable(info, CHB, IRQ_DCD);
1080         info->icount.dcd++;
1081         if (info->serial_signals & SerialSignal_DCD) {
1082                 info->input_signal_events.dcd_up++;
1083         }
1084         else
1085                 info->input_signal_events.dcd_down++;
1086 #if SYNCLINK_GENERIC_HDLC
1087         if (info->netcount) {
1088                 if (info->serial_signals & SerialSignal_DCD)
1089                         netif_carrier_on(info->netdev);
1090                 else
1091                         netif_carrier_off(info->netdev);
1092         }
1093 #endif
1094         wake_up_interruptible(&info->status_event_wait_q);
1095         wake_up_interruptible(&info->event_wait_q);
1096
1097         if (info->port.flags & ASYNC_CHECK_CD) {
1098                 if (debug_level >= DEBUG_LEVEL_ISR)
1099                         printk("%s CD now %s...", info->device_name,
1100                                (info->serial_signals & SerialSignal_DCD) ? "on" : "off");
1101                 if (info->serial_signals & SerialSignal_DCD)
1102                         wake_up_interruptible(&info->port.open_wait);
1103                 else {
1104                         if (debug_level >= DEBUG_LEVEL_ISR)
1105                                 printk("doing serial hangup...");
1106                         if (tty)
1107                                 tty_hangup(tty);
1108                 }
1109         }
1110         info->pending_bh |= BH_STATUS;
1111 }
1112
1113 static void dsr_change(MGSLPC_INFO *info)
1114 {
1115         get_signals(info);
1116         if ((info->dsr_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1117                 port_irq_disable(info, PVR_DSR);
1118         info->icount.dsr++;
1119         if (info->serial_signals & SerialSignal_DSR)
1120                 info->input_signal_events.dsr_up++;
1121         else
1122                 info->input_signal_events.dsr_down++;
1123         wake_up_interruptible(&info->status_event_wait_q);
1124         wake_up_interruptible(&info->event_wait_q);
1125         info->pending_bh |= BH_STATUS;
1126 }
1127
1128 static void ri_change(MGSLPC_INFO *info)
1129 {
1130         get_signals(info);
1131         if ((info->ri_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1132                 port_irq_disable(info, PVR_RI);
1133         info->icount.rng++;
1134         if (info->serial_signals & SerialSignal_RI)
1135                 info->input_signal_events.ri_up++;
1136         else
1137                 info->input_signal_events.ri_down++;
1138         wake_up_interruptible(&info->status_event_wait_q);
1139         wake_up_interruptible(&info->event_wait_q);
1140         info->pending_bh |= BH_STATUS;
1141 }
1142
1143 /* Interrupt service routine entry point.
1144  *
1145  * Arguments:
1146  *
1147  * irq     interrupt number that caused interrupt
1148  * dev_id  device ID supplied during interrupt registration
1149  */
1150 static irqreturn_t mgslpc_isr(int dummy, void *dev_id)
1151 {
1152         MGSLPC_INFO *info = dev_id;
1153         struct tty_struct *tty;
1154         unsigned short isr;
1155         unsigned char gis, pis;
1156         int count=0;
1157
1158         if (debug_level >= DEBUG_LEVEL_ISR)
1159                 printk("mgslpc_isr(%d) entry.\n", info->irq_level);
1160
1161         if (!(info->p_dev->_locked))
1162                 return IRQ_HANDLED;
1163
1164         tty = tty_port_tty_get(&info->port);
1165
1166         spin_lock(&info->lock);
1167
1168         while ((gis = read_reg(info, CHA + GIS))) {
1169                 if (debug_level >= DEBUG_LEVEL_ISR)
1170                         printk("mgslpc_isr %s gis=%04X\n", info->device_name,gis);
1171
1172                 if ((gis & 0x70) || count > 1000) {
1173                         printk("synclink_cs:hardware failed or ejected\n");
1174                         break;
1175                 }
1176                 count++;
1177
1178                 if (gis & (BIT1 + BIT0)) {
1179                         isr = read_reg16(info, CHB + ISR);
1180                         if (isr & IRQ_DCD)
1181                                 dcd_change(info, tty);
1182                         if (isr & IRQ_CTS)
1183                                 cts_change(info, tty);
1184                 }
1185                 if (gis & (BIT3 + BIT2))
1186                 {
1187                         isr = read_reg16(info, CHA + ISR);
1188                         if (isr & IRQ_TIMER) {
1189                                 info->irq_occurred = true;
1190                                 irq_disable(info, CHA, IRQ_TIMER);
1191                         }
1192
1193                         /* receive IRQs */
1194                         if (isr & IRQ_EXITHUNT) {
1195                                 info->icount.exithunt++;
1196                                 wake_up_interruptible(&info->event_wait_q);
1197                         }
1198                         if (isr & IRQ_BREAK_ON) {
1199                                 info->icount.brk++;
1200                                 if (info->port.flags & ASYNC_SAK)
1201                                         do_SAK(tty);
1202                         }
1203                         if (isr & IRQ_RXTIME) {
1204                                 issue_command(info, CHA, CMD_RXFIFO_READ);
1205                         }
1206                         if (isr & (IRQ_RXEOM + IRQ_RXFIFO)) {
1207                                 if (info->params.mode == MGSL_MODE_HDLC)
1208                                         rx_ready_hdlc(info, isr & IRQ_RXEOM);
1209                                 else
1210                                         rx_ready_async(info, isr & IRQ_RXEOM);
1211                         }
1212
1213                         /* transmit IRQs */
1214                         if (isr & IRQ_UNDERRUN) {
1215                                 if (info->tx_aborting)
1216                                         info->icount.txabort++;
1217                                 else
1218                                         info->icount.txunder++;
1219                                 tx_done(info, tty);
1220                         }
1221                         else if (isr & IRQ_ALLSENT) {
1222                                 info->icount.txok++;
1223                                 tx_done(info, tty);
1224                         }
1225                         else if (isr & IRQ_TXFIFO)
1226                                 tx_ready(info, tty);
1227                 }
1228                 if (gis & BIT7) {
1229                         pis = read_reg(info, CHA + PIS);
1230                         if (pis & BIT1)
1231                                 dsr_change(info);
1232                         if (pis & BIT2)
1233                                 ri_change(info);
1234                 }
1235         }
1236
1237         /* Request bottom half processing if there's something
1238          * for it to do and the bh is not already running
1239          */
1240
1241         if (info->pending_bh && !info->bh_running && !info->bh_requested) {
1242                 if ( debug_level >= DEBUG_LEVEL_ISR )
1243                         printk("%s(%d):%s queueing bh task.\n",
1244                                 __FILE__,__LINE__,info->device_name);
1245                 schedule_work(&info->task);
1246                 info->bh_requested = true;
1247         }
1248
1249         spin_unlock(&info->lock);
1250         tty_kref_put(tty);
1251
1252         if (debug_level >= DEBUG_LEVEL_ISR)
1253                 printk("%s(%d):mgslpc_isr(%d)exit.\n",
1254                        __FILE__, __LINE__, info->irq_level);
1255
1256         return IRQ_HANDLED;
1257 }
1258
1259 /* Initialize and start device.
1260  */
1261 static int startup(MGSLPC_INFO * info, struct tty_struct *tty)
1262 {
1263         int retval = 0;
1264
1265         if (debug_level >= DEBUG_LEVEL_INFO)
1266                 printk("%s(%d):startup(%s)\n",__FILE__,__LINE__,info->device_name);
1267
1268         if (info->port.flags & ASYNC_INITIALIZED)
1269                 return 0;
1270
1271         if (!info->tx_buf) {
1272                 /* allocate a page of memory for a transmit buffer */
1273                 info->tx_buf = (unsigned char *)get_zeroed_page(GFP_KERNEL);
1274                 if (!info->tx_buf) {
1275                         printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
1276                                 __FILE__,__LINE__,info->device_name);
1277                         return -ENOMEM;
1278                 }
1279         }
1280
1281         info->pending_bh = 0;
1282
1283         memset(&info->icount, 0, sizeof(info->icount));
1284
1285         setup_timer(&info->tx_timer, tx_timeout, (unsigned long)info);
1286
1287         /* Allocate and claim adapter resources */
1288         retval = claim_resources(info);
1289
1290         /* perform existence check and diagnostics */
1291         if ( !retval )
1292                 retval = adapter_test(info);
1293
1294         if ( retval ) {
1295                 if (capable(CAP_SYS_ADMIN) && tty)
1296                         set_bit(TTY_IO_ERROR, &tty->flags);
1297                 release_resources(info);
1298                 return retval;
1299         }
1300
1301         /* program hardware for current parameters */
1302         mgslpc_change_params(info, tty);
1303
1304         if (tty)
1305                 clear_bit(TTY_IO_ERROR, &tty->flags);
1306
1307         info->port.flags |= ASYNC_INITIALIZED;
1308
1309         return 0;
1310 }
1311
1312 /* Called by mgslpc_close() and mgslpc_hangup() to shutdown hardware
1313  */
1314 static void shutdown(MGSLPC_INFO * info, struct tty_struct *tty)
1315 {
1316         unsigned long flags;
1317
1318         if (!(info->port.flags & ASYNC_INITIALIZED))
1319                 return;
1320
1321         if (debug_level >= DEBUG_LEVEL_INFO)
1322                 printk("%s(%d):mgslpc_shutdown(%s)\n",
1323                          __FILE__,__LINE__, info->device_name );
1324
1325         /* clear status wait queue because status changes */
1326         /* can't happen after shutting down the hardware */
1327         wake_up_interruptible(&info->status_event_wait_q);
1328         wake_up_interruptible(&info->event_wait_q);
1329
1330         del_timer_sync(&info->tx_timer);
1331
1332         if (info->tx_buf) {
1333                 free_page((unsigned long) info->tx_buf);
1334                 info->tx_buf = NULL;
1335         }
1336
1337         spin_lock_irqsave(&info->lock,flags);
1338
1339         rx_stop(info);
1340         tx_stop(info);
1341
1342         /* TODO:disable interrupts instead of reset to preserve signal states */
1343         reset_device(info);
1344
1345         if (!tty || tty->termios.c_cflag & HUPCL) {
1346                 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
1347                 set_signals(info);
1348         }
1349
1350         spin_unlock_irqrestore(&info->lock,flags);
1351
1352         release_resources(info);
1353
1354         if (tty)
1355                 set_bit(TTY_IO_ERROR, &tty->flags);
1356
1357         info->port.flags &= ~ASYNC_INITIALIZED;
1358 }
1359
1360 static void mgslpc_program_hw(MGSLPC_INFO *info, struct tty_struct *tty)
1361 {
1362         unsigned long flags;
1363
1364         spin_lock_irqsave(&info->lock,flags);
1365
1366         rx_stop(info);
1367         tx_stop(info);
1368         info->tx_count = info->tx_put = info->tx_get = 0;
1369
1370         if (info->params.mode == MGSL_MODE_HDLC || info->netcount)
1371                 hdlc_mode(info);
1372         else
1373                 async_mode(info);
1374
1375         set_signals(info);
1376
1377         info->dcd_chkcount = 0;
1378         info->cts_chkcount = 0;
1379         info->ri_chkcount = 0;
1380         info->dsr_chkcount = 0;
1381
1382         irq_enable(info, CHB, IRQ_DCD | IRQ_CTS);
1383         port_irq_enable(info, (unsigned char) PVR_DSR | PVR_RI);
1384         get_signals(info);
1385
1386         if (info->netcount || (tty && (tty->termios.c_cflag & CREAD)))
1387                 rx_start(info);
1388
1389         spin_unlock_irqrestore(&info->lock,flags);
1390 }
1391
1392 /* Reconfigure adapter based on new parameters
1393  */
1394 static void mgslpc_change_params(MGSLPC_INFO *info, struct tty_struct *tty)
1395 {
1396         unsigned cflag;
1397         int bits_per_char;
1398
1399         if (!tty)
1400                 return;
1401
1402         if (debug_level >= DEBUG_LEVEL_INFO)
1403                 printk("%s(%d):mgslpc_change_params(%s)\n",
1404                          __FILE__,__LINE__, info->device_name );
1405
1406         cflag = tty->termios.c_cflag;
1407
1408         /* if B0 rate (hangup) specified then negate RTS and DTR */
1409         /* otherwise assert RTS and DTR */
1410         if (cflag & CBAUD)
1411                 info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR;
1412         else
1413                 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
1414
1415         /* byte size and parity */
1416
1417         switch (cflag & CSIZE) {
1418         case CS5: info->params.data_bits = 5; break;
1419         case CS6: info->params.data_bits = 6; break;
1420         case CS7: info->params.data_bits = 7; break;
1421         case CS8: info->params.data_bits = 8; break;
1422         default:  info->params.data_bits = 7; break;
1423         }
1424
1425         if (cflag & CSTOPB)
1426                 info->params.stop_bits = 2;
1427         else
1428                 info->params.stop_bits = 1;
1429
1430         info->params.parity = ASYNC_PARITY_NONE;
1431         if (cflag & PARENB) {
1432                 if (cflag & PARODD)
1433                         info->params.parity = ASYNC_PARITY_ODD;
1434                 else
1435                         info->params.parity = ASYNC_PARITY_EVEN;
1436 #ifdef CMSPAR
1437                 if (cflag & CMSPAR)
1438                         info->params.parity = ASYNC_PARITY_SPACE;
1439 #endif
1440         }
1441
1442         /* calculate number of jiffies to transmit a full
1443          * FIFO (32 bytes) at specified data rate
1444          */
1445         bits_per_char = info->params.data_bits +
1446                         info->params.stop_bits + 1;
1447
1448         /* if port data rate is set to 460800 or less then
1449          * allow tty settings to override, otherwise keep the
1450          * current data rate.
1451          */
1452         if (info->params.data_rate <= 460800) {
1453                 info->params.data_rate = tty_get_baud_rate(tty);
1454         }
1455
1456         if ( info->params.data_rate ) {
1457                 info->timeout = (32*HZ*bits_per_char) /
1458                                 info->params.data_rate;
1459         }
1460         info->timeout += HZ/50;         /* Add .02 seconds of slop */
1461
1462         if (cflag & CRTSCTS)
1463                 info->port.flags |= ASYNC_CTS_FLOW;
1464         else
1465                 info->port.flags &= ~ASYNC_CTS_FLOW;
1466
1467         if (cflag & CLOCAL)
1468                 info->port.flags &= ~ASYNC_CHECK_CD;
1469         else
1470                 info->port.flags |= ASYNC_CHECK_CD;
1471
1472         /* process tty input control flags */
1473
1474         info->read_status_mask = 0;
1475         if (I_INPCK(tty))
1476                 info->read_status_mask |= BIT7 | BIT6;
1477         if (I_IGNPAR(tty))
1478                 info->ignore_status_mask |= BIT7 | BIT6;
1479
1480         mgslpc_program_hw(info, tty);
1481 }
1482
1483 /* Add a character to the transmit buffer
1484  */
1485 static int mgslpc_put_char(struct tty_struct *tty, unsigned char ch)
1486 {
1487         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1488         unsigned long flags;
1489
1490         if (debug_level >= DEBUG_LEVEL_INFO) {
1491                 printk( "%s(%d):mgslpc_put_char(%d) on %s\n",
1492                         __FILE__,__LINE__,ch,info->device_name);
1493         }
1494
1495         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_put_char"))
1496                 return 0;
1497
1498         if (!info->tx_buf)
1499                 return 0;
1500
1501         spin_lock_irqsave(&info->lock,flags);
1502
1503         if (info->params.mode == MGSL_MODE_ASYNC || !info->tx_active) {
1504                 if (info->tx_count < TXBUFSIZE - 1) {
1505                         info->tx_buf[info->tx_put++] = ch;
1506                         info->tx_put &= TXBUFSIZE-1;
1507                         info->tx_count++;
1508                 }
1509         }
1510
1511         spin_unlock_irqrestore(&info->lock,flags);
1512         return 1;
1513 }
1514
1515 /* Enable transmitter so remaining characters in the
1516  * transmit buffer are sent.
1517  */
1518 static void mgslpc_flush_chars(struct tty_struct *tty)
1519 {
1520         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1521         unsigned long flags;
1522
1523         if (debug_level >= DEBUG_LEVEL_INFO)
1524                 printk( "%s(%d):mgslpc_flush_chars() entry on %s tx_count=%d\n",
1525                         __FILE__,__LINE__,info->device_name,info->tx_count);
1526
1527         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_flush_chars"))
1528                 return;
1529
1530         if (info->tx_count <= 0 || tty->stopped ||
1531             tty->hw_stopped || !info->tx_buf)
1532                 return;
1533
1534         if (debug_level >= DEBUG_LEVEL_INFO)
1535                 printk( "%s(%d):mgslpc_flush_chars() entry on %s starting transmitter\n",
1536                         __FILE__,__LINE__,info->device_name);
1537
1538         spin_lock_irqsave(&info->lock,flags);
1539         if (!info->tx_active)
1540                 tx_start(info, tty);
1541         spin_unlock_irqrestore(&info->lock,flags);
1542 }
1543
1544 /* Send a block of data
1545  *
1546  * Arguments:
1547  *
1548  * tty        pointer to tty information structure
1549  * buf        pointer to buffer containing send data
1550  * count      size of send data in bytes
1551  *
1552  * Returns: number of characters written
1553  */
1554 static int mgslpc_write(struct tty_struct * tty,
1555                         const unsigned char *buf, int count)
1556 {
1557         int c, ret = 0;
1558         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1559         unsigned long flags;
1560
1561         if (debug_level >= DEBUG_LEVEL_INFO)
1562                 printk( "%s(%d):mgslpc_write(%s) count=%d\n",
1563                         __FILE__,__LINE__,info->device_name,count);
1564
1565         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_write") ||
1566                 !info->tx_buf)
1567                 goto cleanup;
1568
1569         if (info->params.mode == MGSL_MODE_HDLC) {
1570                 if (count > TXBUFSIZE) {
1571                         ret = -EIO;
1572                         goto cleanup;
1573                 }
1574                 if (info->tx_active)
1575                         goto cleanup;
1576                 else if (info->tx_count)
1577                         goto start;
1578         }
1579
1580         for (;;) {
1581                 c = min(count,
1582                         min(TXBUFSIZE - info->tx_count - 1,
1583                             TXBUFSIZE - info->tx_put));
1584                 if (c <= 0)
1585                         break;
1586
1587                 memcpy(info->tx_buf + info->tx_put, buf, c);
1588
1589                 spin_lock_irqsave(&info->lock,flags);
1590                 info->tx_put = (info->tx_put + c) & (TXBUFSIZE-1);
1591                 info->tx_count += c;
1592                 spin_unlock_irqrestore(&info->lock,flags);
1593
1594                 buf += c;
1595                 count -= c;
1596                 ret += c;
1597         }
1598 start:
1599         if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
1600                 spin_lock_irqsave(&info->lock,flags);
1601                 if (!info->tx_active)
1602                         tx_start(info, tty);
1603                 spin_unlock_irqrestore(&info->lock,flags);
1604         }
1605 cleanup:
1606         if (debug_level >= DEBUG_LEVEL_INFO)
1607                 printk( "%s(%d):mgslpc_write(%s) returning=%d\n",
1608                         __FILE__,__LINE__,info->device_name,ret);
1609         return ret;
1610 }
1611
1612 /* Return the count of free bytes in transmit buffer
1613  */
1614 static int mgslpc_write_room(struct tty_struct *tty)
1615 {
1616         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1617         int ret;
1618
1619         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_write_room"))
1620                 return 0;
1621
1622         if (info->params.mode == MGSL_MODE_HDLC) {
1623                 /* HDLC (frame oriented) mode */
1624                 if (info->tx_active)
1625                         return 0;
1626                 else
1627                         return HDLC_MAX_FRAME_SIZE;
1628         } else {
1629                 ret = TXBUFSIZE - info->tx_count - 1;
1630                 if (ret < 0)
1631                         ret = 0;
1632         }
1633
1634         if (debug_level >= DEBUG_LEVEL_INFO)
1635                 printk("%s(%d):mgslpc_write_room(%s)=%d\n",
1636                          __FILE__,__LINE__, info->device_name, ret);
1637         return ret;
1638 }
1639
1640 /* Return the count of bytes in transmit buffer
1641  */
1642 static int mgslpc_chars_in_buffer(struct tty_struct *tty)
1643 {
1644         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1645         int rc;
1646
1647         if (debug_level >= DEBUG_LEVEL_INFO)
1648                 printk("%s(%d):mgslpc_chars_in_buffer(%s)\n",
1649                          __FILE__,__LINE__, info->device_name );
1650
1651         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_chars_in_buffer"))
1652                 return 0;
1653
1654         if (info->params.mode == MGSL_MODE_HDLC)
1655                 rc = info->tx_active ? info->max_frame_size : 0;
1656         else
1657                 rc = info->tx_count;
1658
1659         if (debug_level >= DEBUG_LEVEL_INFO)
1660                 printk("%s(%d):mgslpc_chars_in_buffer(%s)=%d\n",
1661                          __FILE__,__LINE__, info->device_name, rc);
1662
1663         return rc;
1664 }
1665
1666 /* Discard all data in the send buffer
1667  */
1668 static void mgslpc_flush_buffer(struct tty_struct *tty)
1669 {
1670         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1671         unsigned long flags;
1672
1673         if (debug_level >= DEBUG_LEVEL_INFO)
1674                 printk("%s(%d):mgslpc_flush_buffer(%s) entry\n",
1675                          __FILE__,__LINE__, info->device_name );
1676
1677         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_flush_buffer"))
1678                 return;
1679
1680         spin_lock_irqsave(&info->lock,flags);
1681         info->tx_count = info->tx_put = info->tx_get = 0;
1682         del_timer(&info->tx_timer);
1683         spin_unlock_irqrestore(&info->lock,flags);
1684
1685         wake_up_interruptible(&tty->write_wait);
1686         tty_wakeup(tty);
1687 }
1688
1689 /* Send a high-priority XON/XOFF character
1690  */
1691 static void mgslpc_send_xchar(struct tty_struct *tty, char ch)
1692 {
1693         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1694         unsigned long flags;
1695
1696         if (debug_level >= DEBUG_LEVEL_INFO)
1697                 printk("%s(%d):mgslpc_send_xchar(%s,%d)\n",
1698                          __FILE__,__LINE__, info->device_name, ch );
1699
1700         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_send_xchar"))
1701                 return;
1702
1703         info->x_char = ch;
1704         if (ch) {
1705                 spin_lock_irqsave(&info->lock,flags);
1706                 if (!info->tx_enabled)
1707                         tx_start(info, tty);
1708                 spin_unlock_irqrestore(&info->lock,flags);
1709         }
1710 }
1711
1712 /* Signal remote device to throttle send data (our receive data)
1713  */
1714 static void mgslpc_throttle(struct tty_struct * tty)
1715 {
1716         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1717         unsigned long flags;
1718
1719         if (debug_level >= DEBUG_LEVEL_INFO)
1720                 printk("%s(%d):mgslpc_throttle(%s) entry\n",
1721                          __FILE__,__LINE__, info->device_name );
1722
1723         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_throttle"))
1724                 return;
1725
1726         if (I_IXOFF(tty))
1727                 mgslpc_send_xchar(tty, STOP_CHAR(tty));
1728
1729         if (tty->termios.c_cflag & CRTSCTS) {
1730                 spin_lock_irqsave(&info->lock,flags);
1731                 info->serial_signals &= ~SerialSignal_RTS;
1732                 set_signals(info);
1733                 spin_unlock_irqrestore(&info->lock,flags);
1734         }
1735 }
1736
1737 /* Signal remote device to stop throttling send data (our receive data)
1738  */
1739 static void mgslpc_unthrottle(struct tty_struct * tty)
1740 {
1741         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1742         unsigned long flags;
1743
1744         if (debug_level >= DEBUG_LEVEL_INFO)
1745                 printk("%s(%d):mgslpc_unthrottle(%s) entry\n",
1746                          __FILE__,__LINE__, info->device_name );
1747
1748         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_unthrottle"))
1749                 return;
1750
1751         if (I_IXOFF(tty)) {
1752                 if (info->x_char)
1753                         info->x_char = 0;
1754                 else
1755                         mgslpc_send_xchar(tty, START_CHAR(tty));
1756         }
1757
1758         if (tty->termios.c_cflag & CRTSCTS) {
1759                 spin_lock_irqsave(&info->lock,flags);
1760                 info->serial_signals |= SerialSignal_RTS;
1761                 set_signals(info);
1762                 spin_unlock_irqrestore(&info->lock,flags);
1763         }
1764 }
1765
1766 /* get the current serial statistics
1767  */
1768 static int get_stats(MGSLPC_INFO * info, struct mgsl_icount __user *user_icount)
1769 {
1770         int err;
1771         if (debug_level >= DEBUG_LEVEL_INFO)
1772                 printk("get_params(%s)\n", info->device_name);
1773         if (!user_icount) {
1774                 memset(&info->icount, 0, sizeof(info->icount));
1775         } else {
1776                 COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
1777                 if (err)
1778                         return -EFAULT;
1779         }
1780         return 0;
1781 }
1782
1783 /* get the current serial parameters
1784  */
1785 static int get_params(MGSLPC_INFO * info, MGSL_PARAMS __user *user_params)
1786 {
1787         int err;
1788         if (debug_level >= DEBUG_LEVEL_INFO)
1789                 printk("get_params(%s)\n", info->device_name);
1790         COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
1791         if (err)
1792                 return -EFAULT;
1793         return 0;
1794 }
1795
1796 /* set the serial parameters
1797  *
1798  * Arguments:
1799  *
1800  *      info            pointer to device instance data
1801  *      new_params      user buffer containing new serial params
1802  *
1803  * Returns:     0 if success, otherwise error code
1804  */
1805 static int set_params(MGSLPC_INFO * info, MGSL_PARAMS __user *new_params, struct tty_struct *tty)
1806 {
1807         unsigned long flags;
1808         MGSL_PARAMS tmp_params;
1809         int err;
1810
1811         if (debug_level >= DEBUG_LEVEL_INFO)
1812                 printk("%s(%d):set_params %s\n", __FILE__,__LINE__,
1813                         info->device_name );
1814         COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
1815         if (err) {
1816                 if ( debug_level >= DEBUG_LEVEL_INFO )
1817                         printk( "%s(%d):set_params(%s) user buffer copy failed\n",
1818                                 __FILE__,__LINE__,info->device_name);
1819                 return -EFAULT;
1820         }
1821
1822         spin_lock_irqsave(&info->lock,flags);
1823         memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
1824         spin_unlock_irqrestore(&info->lock,flags);
1825
1826         mgslpc_change_params(info, tty);
1827
1828         return 0;
1829 }
1830
1831 static int get_txidle(MGSLPC_INFO * info, int __user *idle_mode)
1832 {
1833         int err;
1834         if (debug_level >= DEBUG_LEVEL_INFO)
1835                 printk("get_txidle(%s)=%d\n", info->device_name, info->idle_mode);
1836         COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
1837         if (err)
1838                 return -EFAULT;
1839         return 0;
1840 }
1841
1842 static int set_txidle(MGSLPC_INFO * info, int idle_mode)
1843 {
1844         unsigned long flags;
1845         if (debug_level >= DEBUG_LEVEL_INFO)
1846                 printk("set_txidle(%s,%d)\n", info->device_name, idle_mode);
1847         spin_lock_irqsave(&info->lock,flags);
1848         info->idle_mode = idle_mode;
1849         tx_set_idle(info);
1850         spin_unlock_irqrestore(&info->lock,flags);
1851         return 0;
1852 }
1853
1854 static int get_interface(MGSLPC_INFO * info, int __user *if_mode)
1855 {
1856         int err;
1857         if (debug_level >= DEBUG_LEVEL_INFO)
1858                 printk("get_interface(%s)=%d\n", info->device_name, info->if_mode);
1859         COPY_TO_USER(err,if_mode, &info->if_mode, sizeof(int));
1860         if (err)
1861                 return -EFAULT;
1862         return 0;
1863 }
1864
1865 static int set_interface(MGSLPC_INFO * info, int if_mode)
1866 {
1867         unsigned long flags;
1868         unsigned char val;
1869         if (debug_level >= DEBUG_LEVEL_INFO)
1870                 printk("set_interface(%s,%d)\n", info->device_name, if_mode);
1871         spin_lock_irqsave(&info->lock,flags);
1872         info->if_mode = if_mode;
1873
1874         val = read_reg(info, PVR) & 0x0f;
1875         switch (info->if_mode)
1876         {
1877         case MGSL_INTERFACE_RS232: val |= PVR_RS232; break;
1878         case MGSL_INTERFACE_V35:   val |= PVR_V35;   break;
1879         case MGSL_INTERFACE_RS422: val |= PVR_RS422; break;
1880         }
1881         write_reg(info, PVR, val);
1882
1883         spin_unlock_irqrestore(&info->lock,flags);
1884         return 0;
1885 }
1886
1887 static int set_txenable(MGSLPC_INFO * info, int enable, struct tty_struct *tty)
1888 {
1889         unsigned long flags;
1890
1891         if (debug_level >= DEBUG_LEVEL_INFO)
1892                 printk("set_txenable(%s,%d)\n", info->device_name, enable);
1893
1894         spin_lock_irqsave(&info->lock,flags);
1895         if (enable) {
1896                 if (!info->tx_enabled)
1897                         tx_start(info, tty);
1898         } else {
1899                 if (info->tx_enabled)
1900                         tx_stop(info);
1901         }
1902         spin_unlock_irqrestore(&info->lock,flags);
1903         return 0;
1904 }
1905
1906 static int tx_abort(MGSLPC_INFO * info)
1907 {
1908         unsigned long flags;
1909
1910         if (debug_level >= DEBUG_LEVEL_INFO)
1911                 printk("tx_abort(%s)\n", info->device_name);
1912
1913         spin_lock_irqsave(&info->lock,flags);
1914         if (info->tx_active && info->tx_count &&
1915             info->params.mode == MGSL_MODE_HDLC) {
1916                 /* clear data count so FIFO is not filled on next IRQ.
1917                  * This results in underrun and abort transmission.
1918                  */
1919                 info->tx_count = info->tx_put = info->tx_get = 0;
1920                 info->tx_aborting = true;
1921         }
1922         spin_unlock_irqrestore(&info->lock,flags);
1923         return 0;
1924 }
1925
1926 static int set_rxenable(MGSLPC_INFO * info, int enable)
1927 {
1928         unsigned long flags;
1929
1930         if (debug_level >= DEBUG_LEVEL_INFO)
1931                 printk("set_rxenable(%s,%d)\n", info->device_name, enable);
1932
1933         spin_lock_irqsave(&info->lock,flags);
1934         if (enable) {
1935                 if (!info->rx_enabled)
1936                         rx_start(info);
1937         } else {
1938                 if (info->rx_enabled)
1939                         rx_stop(info);
1940         }
1941         spin_unlock_irqrestore(&info->lock,flags);
1942         return 0;
1943 }
1944
1945 /* wait for specified event to occur
1946  *
1947  * Arguments:           info    pointer to device instance data
1948  *                      mask    pointer to bitmask of events to wait for
1949  * Return Value:        0       if successful and bit mask updated with
1950  *                              of events triggerred,
1951  *                      otherwise error code
1952  */
1953 static int wait_events(MGSLPC_INFO * info, int __user *mask_ptr)
1954 {
1955         unsigned long flags;
1956         int s;
1957         int rc=0;
1958         struct mgsl_icount cprev, cnow;
1959         int events;
1960         int mask;
1961         struct  _input_signal_events oldsigs, newsigs;
1962         DECLARE_WAITQUEUE(wait, current);
1963
1964         COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
1965         if (rc)
1966                 return  -EFAULT;
1967
1968         if (debug_level >= DEBUG_LEVEL_INFO)
1969                 printk("wait_events(%s,%d)\n", info->device_name, mask);
1970
1971         spin_lock_irqsave(&info->lock,flags);
1972
1973         /* return immediately if state matches requested events */
1974         get_signals(info);
1975         s = info->serial_signals;
1976         events = mask &
1977                 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
1978                   ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
1979                   ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
1980                   ((s & SerialSignal_RI)  ? MgslEvent_RiActive :MgslEvent_RiInactive) );
1981         if (events) {
1982                 spin_unlock_irqrestore(&info->lock,flags);
1983                 goto exit;
1984         }
1985
1986         /* save current irq counts */
1987         cprev = info->icount;
1988         oldsigs = info->input_signal_events;
1989
1990         if ((info->params.mode == MGSL_MODE_HDLC) &&
1991             (mask & MgslEvent_ExitHuntMode))
1992                 irq_enable(info, CHA, IRQ_EXITHUNT);
1993
1994         set_current_state(TASK_INTERRUPTIBLE);
1995         add_wait_queue(&info->event_wait_q, &wait);
1996
1997         spin_unlock_irqrestore(&info->lock,flags);
1998
1999
2000         for(;;) {
2001                 schedule();
2002                 if (signal_pending(current)) {
2003                         rc = -ERESTARTSYS;
2004                         break;
2005                 }
2006
2007                 /* get current irq counts */
2008                 spin_lock_irqsave(&info->lock,flags);
2009                 cnow = info->icount;
2010                 newsigs = info->input_signal_events;
2011                 set_current_state(TASK_INTERRUPTIBLE);
2012                 spin_unlock_irqrestore(&info->lock,flags);
2013
2014                 /* if no change, wait aborted for some reason */
2015                 if (newsigs.dsr_up   == oldsigs.dsr_up   &&
2016                     newsigs.dsr_down == oldsigs.dsr_down &&
2017                     newsigs.dcd_up   == oldsigs.dcd_up   &&
2018                     newsigs.dcd_down == oldsigs.dcd_down &&
2019                     newsigs.cts_up   == oldsigs.cts_up   &&
2020                     newsigs.cts_down == oldsigs.cts_down &&
2021                     newsigs.ri_up    == oldsigs.ri_up    &&
2022                     newsigs.ri_down  == oldsigs.ri_down  &&
2023                     cnow.exithunt    == cprev.exithunt   &&
2024                     cnow.rxidle      == cprev.rxidle) {
2025                         rc = -EIO;
2026                         break;
2027                 }
2028
2029                 events = mask &
2030                         ( (newsigs.dsr_up   != oldsigs.dsr_up   ? MgslEvent_DsrActive:0)   +
2031                           (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
2032                           (newsigs.dcd_up   != oldsigs.dcd_up   ? MgslEvent_DcdActive:0)   +
2033                           (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
2034                           (newsigs.cts_up   != oldsigs.cts_up   ? MgslEvent_CtsActive:0)   +
2035                           (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
2036                           (newsigs.ri_up    != oldsigs.ri_up    ? MgslEvent_RiActive:0)    +
2037                           (newsigs.ri_down  != oldsigs.ri_down  ? MgslEvent_RiInactive:0)  +
2038                           (cnow.exithunt    != cprev.exithunt   ? MgslEvent_ExitHuntMode:0) +
2039                           (cnow.rxidle      != cprev.rxidle     ? MgslEvent_IdleReceived:0) );
2040                 if (events)
2041                         break;
2042
2043                 cprev = cnow;
2044                 oldsigs = newsigs;
2045         }
2046
2047         remove_wait_queue(&info->event_wait_q, &wait);
2048         set_current_state(TASK_RUNNING);
2049
2050         if (mask & MgslEvent_ExitHuntMode) {
2051                 spin_lock_irqsave(&info->lock,flags);
2052                 if (!waitqueue_active(&info->event_wait_q))
2053                         irq_disable(info, CHA, IRQ_EXITHUNT);
2054                 spin_unlock_irqrestore(&info->lock,flags);
2055         }
2056 exit:
2057         if (rc == 0)
2058                 PUT_USER(rc, events, mask_ptr);
2059         return rc;
2060 }
2061
2062 static int modem_input_wait(MGSLPC_INFO *info,int arg)
2063 {
2064         unsigned long flags;
2065         int rc;
2066         struct mgsl_icount cprev, cnow;
2067         DECLARE_WAITQUEUE(wait, current);
2068
2069         /* save current irq counts */
2070         spin_lock_irqsave(&info->lock,flags);
2071         cprev = info->icount;
2072         add_wait_queue(&info->status_event_wait_q, &wait);
2073         set_current_state(TASK_INTERRUPTIBLE);
2074         spin_unlock_irqrestore(&info->lock,flags);
2075
2076         for(;;) {
2077                 schedule();
2078                 if (signal_pending(current)) {
2079                         rc = -ERESTARTSYS;
2080                         break;
2081                 }
2082
2083                 /* get new irq counts */
2084                 spin_lock_irqsave(&info->lock,flags);
2085                 cnow = info->icount;
2086                 set_current_state(TASK_INTERRUPTIBLE);
2087                 spin_unlock_irqrestore(&info->lock,flags);
2088
2089                 /* if no change, wait aborted for some reason */
2090                 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2091                     cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
2092                         rc = -EIO;
2093                         break;
2094                 }
2095
2096                 /* check for change in caller specified modem input */
2097                 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
2098                     (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
2099                     (arg & TIOCM_CD  && cnow.dcd != cprev.dcd) ||
2100                     (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
2101                         rc = 0;
2102                         break;
2103                 }
2104
2105                 cprev = cnow;
2106         }
2107         remove_wait_queue(&info->status_event_wait_q, &wait);
2108         set_current_state(TASK_RUNNING);
2109         return rc;
2110 }
2111
2112 /* return the state of the serial control and status signals
2113  */
2114 static int tiocmget(struct tty_struct *tty)
2115 {
2116         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
2117         unsigned int result;
2118         unsigned long flags;
2119
2120         spin_lock_irqsave(&info->lock,flags);
2121         get_signals(info);
2122         spin_unlock_irqrestore(&info->lock,flags);
2123
2124         result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
2125                 ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
2126                 ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
2127                 ((info->serial_signals & SerialSignal_RI)  ? TIOCM_RNG:0) +
2128                 ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
2129                 ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS:0);
2130
2131         if (debug_level >= DEBUG_LEVEL_INFO)
2132                 printk("%s(%d):%s tiocmget() value=%08X\n",
2133                          __FILE__,__LINE__, info->device_name, result );
2134         return result;
2135 }
2136
2137 /* set modem control signals (DTR/RTS)
2138  */
2139 static int tiocmset(struct tty_struct *tty,
2140                     unsigned int set, unsigned int clear)
2141 {
2142         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
2143         unsigned long flags;
2144
2145         if (debug_level >= DEBUG_LEVEL_INFO)
2146                 printk("%s(%d):%s tiocmset(%x,%x)\n",
2147                         __FILE__,__LINE__,info->device_name, set, clear);
2148
2149         if (set & TIOCM_RTS)
2150                 info->serial_signals |= SerialSignal_RTS;
2151         if (set & TIOCM_DTR)
2152                 info->serial_signals |= SerialSignal_DTR;
2153         if (clear & TIOCM_RTS)
2154                 info->serial_signals &= ~SerialSignal_RTS;
2155         if (clear & TIOCM_DTR)
2156                 info->serial_signals &= ~SerialSignal_DTR;
2157
2158         spin_lock_irqsave(&info->lock,flags);
2159         set_signals(info);
2160         spin_unlock_irqrestore(&info->lock,flags);
2161
2162         return 0;
2163 }
2164
2165 /* Set or clear transmit break condition
2166  *
2167  * Arguments:           tty             pointer to tty instance data
2168  *                      break_state     -1=set break condition, 0=clear
2169  */
2170 static int mgslpc_break(struct tty_struct *tty, int break_state)
2171 {
2172         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2173         unsigned long flags;
2174
2175         if (debug_level >= DEBUG_LEVEL_INFO)
2176                 printk("%s(%d):mgslpc_break(%s,%d)\n",
2177                          __FILE__,__LINE__, info->device_name, break_state);
2178
2179         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_break"))
2180                 return -EINVAL;
2181
2182         spin_lock_irqsave(&info->lock,flags);
2183         if (break_state == -1)
2184                 set_reg_bits(info, CHA+DAFO, BIT6);
2185         else
2186                 clear_reg_bits(info, CHA+DAFO, BIT6);
2187         spin_unlock_irqrestore(&info->lock,flags);
2188         return 0;
2189 }
2190
2191 static int mgslpc_get_icount(struct tty_struct *tty,
2192                                 struct serial_icounter_struct *icount)
2193 {
2194         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2195         struct mgsl_icount cnow;        /* kernel counter temps */
2196         unsigned long flags;
2197
2198         spin_lock_irqsave(&info->lock,flags);
2199         cnow = info->icount;
2200         spin_unlock_irqrestore(&info->lock,flags);
2201
2202         icount->cts = cnow.cts;
2203         icount->dsr = cnow.dsr;
2204         icount->rng = cnow.rng;
2205         icount->dcd = cnow.dcd;
2206         icount->rx = cnow.rx;
2207         icount->tx = cnow.tx;
2208         icount->frame = cnow.frame;
2209         icount->overrun = cnow.overrun;
2210         icount->parity = cnow.parity;
2211         icount->brk = cnow.brk;
2212         icount->buf_overrun = cnow.buf_overrun;
2213
2214         return 0;
2215 }
2216
2217 /* Service an IOCTL request
2218  *
2219  * Arguments:
2220  *
2221  *      tty     pointer to tty instance data
2222  *      cmd     IOCTL command code
2223  *      arg     command argument/context
2224  *
2225  * Return Value:        0 if success, otherwise error code
2226  */
2227 static int mgslpc_ioctl(struct tty_struct *tty,
2228                         unsigned int cmd, unsigned long arg)
2229 {
2230         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2231         void __user *argp = (void __user *)arg;
2232
2233         if (debug_level >= DEBUG_LEVEL_INFO)
2234                 printk("%s(%d):mgslpc_ioctl %s cmd=%08X\n", __FILE__,__LINE__,
2235                         info->device_name, cmd );
2236
2237         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_ioctl"))
2238                 return -ENODEV;
2239
2240         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
2241             (cmd != TIOCMIWAIT)) {
2242                 if (tty->flags & (1 << TTY_IO_ERROR))
2243                     return -EIO;
2244         }
2245
2246         switch (cmd) {
2247         case MGSL_IOCGPARAMS:
2248                 return get_params(info, argp);
2249         case MGSL_IOCSPARAMS:
2250                 return set_params(info, argp, tty);
2251         case MGSL_IOCGTXIDLE:
2252                 return get_txidle(info, argp);
2253         case MGSL_IOCSTXIDLE:
2254                 return set_txidle(info, (int)arg);
2255         case MGSL_IOCGIF:
2256                 return get_interface(info, argp);
2257         case MGSL_IOCSIF:
2258                 return set_interface(info,(int)arg);
2259         case MGSL_IOCTXENABLE:
2260                 return set_txenable(info,(int)arg, tty);
2261         case MGSL_IOCRXENABLE:
2262                 return set_rxenable(info,(int)arg);
2263         case MGSL_IOCTXABORT:
2264                 return tx_abort(info);
2265         case MGSL_IOCGSTATS:
2266                 return get_stats(info, argp);
2267         case MGSL_IOCWAITEVENT:
2268                 return wait_events(info, argp);
2269         case TIOCMIWAIT:
2270                 return modem_input_wait(info,(int)arg);
2271         default:
2272                 return -ENOIOCTLCMD;
2273         }
2274         return 0;
2275 }
2276
2277 /* Set new termios settings
2278  *
2279  * Arguments:
2280  *
2281  *      tty             pointer to tty structure
2282  *      termios         pointer to buffer to hold returned old termios
2283  */
2284 static void mgslpc_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
2285 {
2286         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
2287         unsigned long flags;
2288
2289         if (debug_level >= DEBUG_LEVEL_INFO)
2290                 printk("%s(%d):mgslpc_set_termios %s\n", __FILE__,__LINE__,
2291                         tty->driver->name );
2292
2293         /* just return if nothing has changed */
2294         if ((tty->termios.c_cflag == old_termios->c_cflag)
2295             && (RELEVANT_IFLAG(tty->termios.c_iflag)
2296                 == RELEVANT_IFLAG(old_termios->c_iflag)))
2297           return;
2298
2299         mgslpc_change_params(info, tty);
2300
2301         /* Handle transition to B0 status */
2302         if (old_termios->c_cflag & CBAUD &&
2303             !(tty->termios.c_cflag & CBAUD)) {
2304                 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
2305                 spin_lock_irqsave(&info->lock,flags);
2306                 set_signals(info);
2307                 spin_unlock_irqrestore(&info->lock,flags);
2308         }
2309
2310         /* Handle transition away from B0 status */
2311         if (!(old_termios->c_cflag & CBAUD) &&
2312             tty->termios.c_cflag & CBAUD) {
2313                 info->serial_signals |= SerialSignal_DTR;
2314                 if (!(tty->termios.c_cflag & CRTSCTS) ||
2315                     !test_bit(TTY_THROTTLED, &tty->flags)) {
2316                         info->serial_signals |= SerialSignal_RTS;
2317                 }
2318                 spin_lock_irqsave(&info->lock,flags);
2319                 set_signals(info);
2320                 spin_unlock_irqrestore(&info->lock,flags);
2321         }
2322
2323         /* Handle turning off CRTSCTS */
2324         if (old_termios->c_cflag & CRTSCTS &&
2325             !(tty->termios.c_cflag & CRTSCTS)) {
2326                 tty->hw_stopped = 0;
2327                 tx_release(tty);
2328         }
2329 }
2330
2331 static void mgslpc_close(struct tty_struct *tty, struct file * filp)
2332 {
2333         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2334         struct tty_port *port = &info->port;
2335
2336         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_close"))
2337                 return;
2338
2339         if (debug_level >= DEBUG_LEVEL_INFO)
2340                 printk("%s(%d):mgslpc_close(%s) entry, count=%d\n",
2341                          __FILE__,__LINE__, info->device_name, port->count);
2342
2343         WARN_ON(!port->count);
2344
2345         if (tty_port_close_start(port, tty, filp) == 0)
2346                 goto cleanup;
2347
2348         if (port->flags & ASYNC_INITIALIZED)
2349                 mgslpc_wait_until_sent(tty, info->timeout);
2350
2351         mgslpc_flush_buffer(tty);
2352
2353         tty_ldisc_flush(tty);
2354         shutdown(info, tty);
2355         
2356         tty_port_close_end(port, tty);
2357         tty_port_tty_set(port, NULL);
2358 cleanup:
2359         if (debug_level >= DEBUG_LEVEL_INFO)
2360                 printk("%s(%d):mgslpc_close(%s) exit, count=%d\n", __FILE__,__LINE__,
2361                         tty->driver->name, port->count);
2362 }
2363
2364 /* Wait until the transmitter is empty.
2365  */
2366 static void mgslpc_wait_until_sent(struct tty_struct *tty, int timeout)
2367 {
2368         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2369         unsigned long orig_jiffies, char_time;
2370
2371         if (!info )
2372                 return;
2373
2374         if (debug_level >= DEBUG_LEVEL_INFO)
2375                 printk("%s(%d):mgslpc_wait_until_sent(%s) entry\n",
2376                          __FILE__,__LINE__, info->device_name );
2377
2378         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_wait_until_sent"))
2379                 return;
2380
2381         if (!(info->port.flags & ASYNC_INITIALIZED))
2382                 goto exit;
2383
2384         orig_jiffies = jiffies;
2385
2386         /* Set check interval to 1/5 of estimated time to
2387          * send a character, and make it at least 1. The check
2388          * interval should also be less than the timeout.
2389          * Note: use tight timings here to satisfy the NIST-PCTS.
2390          */
2391
2392         if ( info->params.data_rate ) {
2393                 char_time = info->timeout/(32 * 5);
2394                 if (!char_time)
2395                         char_time++;
2396         } else
2397                 char_time = 1;
2398
2399         if (timeout)
2400                 char_time = min_t(unsigned long, char_time, timeout);
2401
2402         if (info->params.mode == MGSL_MODE_HDLC) {
2403                 while (info->tx_active) {
2404                         msleep_interruptible(jiffies_to_msecs(char_time));
2405                         if (signal_pending(current))
2406                                 break;
2407                         if (timeout && time_after(jiffies, orig_jiffies + timeout))
2408                                 break;
2409                 }
2410         } else {
2411                 while ((info->tx_count || info->tx_active) &&
2412                         info->tx_enabled) {
2413                         msleep_interruptible(jiffies_to_msecs(char_time));
2414                         if (signal_pending(current))
2415                                 break;
2416                         if (timeout && time_after(jiffies, orig_jiffies + timeout))
2417                                 break;
2418                 }
2419         }
2420
2421 exit:
2422         if (debug_level >= DEBUG_LEVEL_INFO)
2423                 printk("%s(%d):mgslpc_wait_until_sent(%s) exit\n",
2424                          __FILE__,__LINE__, info->device_name );
2425 }
2426
2427 /* Called by tty_hangup() when a hangup is signaled.
2428  * This is the same as closing all open files for the port.
2429  */
2430 static void mgslpc_hangup(struct tty_struct *tty)
2431 {
2432         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2433
2434         if (debug_level >= DEBUG_LEVEL_INFO)
2435                 printk("%s(%d):mgslpc_hangup(%s)\n",
2436                          __FILE__,__LINE__, info->device_name );
2437
2438         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_hangup"))
2439                 return;
2440
2441         mgslpc_flush_buffer(tty);
2442         shutdown(info, tty);
2443         tty_port_hangup(&info->port);
2444 }
2445
2446 static int carrier_raised(struct tty_port *port)
2447 {
2448         MGSLPC_INFO *info = container_of(port, MGSLPC_INFO, port);
2449         unsigned long flags;
2450
2451         spin_lock_irqsave(&info->lock,flags);
2452         get_signals(info);
2453         spin_unlock_irqrestore(&info->lock,flags);
2454
2455         if (info->serial_signals & SerialSignal_DCD)
2456                 return 1;
2457         return 0;
2458 }
2459
2460 static void dtr_rts(struct tty_port *port, int onoff)
2461 {
2462         MGSLPC_INFO *info = container_of(port, MGSLPC_INFO, port);
2463         unsigned long flags;
2464
2465         spin_lock_irqsave(&info->lock,flags);
2466         if (onoff)
2467                 info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR;
2468         else
2469                 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
2470         set_signals(info);
2471         spin_unlock_irqrestore(&info->lock,flags);
2472 }
2473
2474
2475 static int mgslpc_open(struct tty_struct *tty, struct file * filp)
2476 {
2477         MGSLPC_INFO     *info;
2478         struct tty_port *port;
2479         int                     retval, line;
2480         unsigned long flags;
2481
2482         /* verify range of specified line number */
2483         line = tty->index;
2484         if (line >= mgslpc_device_count) {
2485                 printk("%s(%d):mgslpc_open with invalid line #%d.\n",
2486                         __FILE__,__LINE__,line);
2487                 return -ENODEV;
2488         }
2489
2490         /* find the info structure for the specified line */
2491         info = mgslpc_device_list;
2492         while(info && info->line != line)
2493                 info = info->next_device;
2494         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_open"))
2495                 return -ENODEV;
2496
2497         port = &info->port;
2498         tty->driver_data = info;
2499         tty_port_tty_set(port, tty);
2500
2501         if (debug_level >= DEBUG_LEVEL_INFO)
2502                 printk("%s(%d):mgslpc_open(%s), old ref count = %d\n",
2503                          __FILE__,__LINE__,tty->driver->name, port->count);
2504
2505         /* If port is closing, signal caller to try again */
2506         if (tty_hung_up_p(filp) || port->flags & ASYNC_CLOSING){
2507                 if (port->flags & ASYNC_CLOSING)
2508                         interruptible_sleep_on(&port->close_wait);
2509                 retval = ((port->flags & ASYNC_HUP_NOTIFY) ?
2510                         -EAGAIN : -ERESTARTSYS);
2511                 goto cleanup;
2512         }
2513
2514         port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
2515
2516         spin_lock_irqsave(&info->netlock, flags);
2517         if (info->netcount) {
2518                 retval = -EBUSY;
2519                 spin_unlock_irqrestore(&info->netlock, flags);
2520                 goto cleanup;
2521         }
2522         spin_lock(&port->lock);
2523         port->count++;
2524         spin_unlock(&port->lock);
2525         spin_unlock_irqrestore(&info->netlock, flags);
2526
2527         if (port->count == 1) {
2528                 /* 1st open on this device, init hardware */
2529                 retval = startup(info, tty);
2530                 if (retval < 0)
2531                         goto cleanup;
2532         }
2533
2534         retval = tty_port_block_til_ready(&info->port, tty, filp);
2535         if (retval) {
2536                 if (debug_level >= DEBUG_LEVEL_INFO)
2537                         printk("%s(%d):block_til_ready(%s) returned %d\n",
2538                                  __FILE__,__LINE__, info->device_name, retval);
2539                 goto cleanup;
2540         }
2541
2542         if (debug_level >= DEBUG_LEVEL_INFO)
2543                 printk("%s(%d):mgslpc_open(%s) success\n",
2544                          __FILE__,__LINE__, info->device_name);
2545         retval = 0;
2546
2547 cleanup:
2548         return retval;
2549 }
2550
2551 /*
2552  * /proc fs routines....
2553  */
2554
2555 static inline void line_info(struct seq_file *m, MGSLPC_INFO *info)
2556 {
2557         char    stat_buf[30];
2558         unsigned long flags;
2559
2560         seq_printf(m, "%s:io:%04X irq:%d",
2561                       info->device_name, info->io_base, info->irq_level);
2562
2563         /* output current serial signal states */
2564         spin_lock_irqsave(&info->lock,flags);
2565         get_signals(info);
2566         spin_unlock_irqrestore(&info->lock,flags);
2567
2568         stat_buf[0] = 0;
2569         stat_buf[1] = 0;
2570         if (info->serial_signals & SerialSignal_RTS)
2571                 strcat(stat_buf, "|RTS");
2572         if (info->serial_signals & SerialSignal_CTS)
2573                 strcat(stat_buf, "|CTS");
2574         if (info->serial_signals & SerialSignal_DTR)
2575                 strcat(stat_buf, "|DTR");
2576         if (info->serial_signals & SerialSignal_DSR)
2577                 strcat(stat_buf, "|DSR");
2578         if (info->serial_signals & SerialSignal_DCD)
2579                 strcat(stat_buf, "|CD");
2580         if (info->serial_signals & SerialSignal_RI)
2581                 strcat(stat_buf, "|RI");
2582
2583         if (info->params.mode == MGSL_MODE_HDLC) {
2584                 seq_printf(m, " HDLC txok:%d rxok:%d",
2585                               info->icount.txok, info->icount.rxok);
2586                 if (info->icount.txunder)
2587                         seq_printf(m, " txunder:%d", info->icount.txunder);
2588                 if (info->icount.txabort)
2589                         seq_printf(m, " txabort:%d", info->icount.txabort);
2590                 if (info->icount.rxshort)
2591                         seq_printf(m, " rxshort:%d", info->icount.rxshort);
2592                 if (info->icount.rxlong)
2593                         seq_printf(m, " rxlong:%d", info->icount.rxlong);
2594                 if (info->icount.rxover)
2595                         seq_printf(m, " rxover:%d", info->icount.rxover);
2596                 if (info->icount.rxcrc)
2597                         seq_printf(m, " rxcrc:%d", info->icount.rxcrc);
2598         } else {
2599                 seq_printf(m, " ASYNC tx:%d rx:%d",
2600                               info->icount.tx, info->icount.rx);
2601                 if (info->icount.frame)
2602                         seq_printf(m, " fe:%d", info->icount.frame);
2603                 if (info->icount.parity)
2604                         seq_printf(m, " pe:%d", info->icount.parity);
2605                 if (info->icount.brk)
2606                         seq_printf(m, " brk:%d", info->icount.brk);
2607                 if (info->icount.overrun)
2608                         seq_printf(m, " oe:%d", info->icount.overrun);
2609         }
2610
2611         /* Append serial signal status to end */
2612         seq_printf(m, " %s\n", stat_buf+1);
2613
2614         seq_printf(m, "txactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
2615                        info->tx_active,info->bh_requested,info->bh_running,
2616                        info->pending_bh);
2617 }
2618
2619 /* Called to print information about devices
2620  */
2621 static int mgslpc_proc_show(struct seq_file *m, void *v)
2622 {
2623         MGSLPC_INFO *info;
2624
2625         seq_printf(m, "synclink driver:%s\n", driver_version);
2626
2627         info = mgslpc_device_list;
2628         while( info ) {
2629                 line_info(m, info);
2630                 info = info->next_device;
2631         }
2632         return 0;
2633 }
2634
2635 static int mgslpc_proc_open(struct inode *inode, struct file *file)
2636 {
2637         return single_open(file, mgslpc_proc_show, NULL);
2638 }
2639
2640 static const struct file_operations mgslpc_proc_fops = {
2641         .owner          = THIS_MODULE,
2642         .open           = mgslpc_proc_open,
2643         .read           = seq_read,
2644         .llseek         = seq_lseek,
2645         .release        = single_release,
2646 };
2647
2648 static int rx_alloc_buffers(MGSLPC_INFO *info)
2649 {
2650         /* each buffer has header and data */
2651         info->rx_buf_size = sizeof(RXBUF) + info->max_frame_size;
2652
2653         /* calculate total allocation size for 8 buffers */
2654         info->rx_buf_total_size = info->rx_buf_size * 8;
2655
2656         /* limit total allocated memory */
2657         if (info->rx_buf_total_size > 0x10000)
2658                 info->rx_buf_total_size = 0x10000;
2659
2660         /* calculate number of buffers */
2661         info->rx_buf_count = info->rx_buf_total_size / info->rx_buf_size;
2662
2663         info->rx_buf = kmalloc(info->rx_buf_total_size, GFP_KERNEL);
2664         if (info->rx_buf == NULL)
2665                 return -ENOMEM;
2666
2667         /* unused flag buffer to satisfy receive_buf calling interface */
2668         info->flag_buf = kzalloc(info->max_frame_size, GFP_KERNEL);
2669         if (!info->flag_buf) {
2670                 kfree(info->rx_buf);
2671                 info->rx_buf = NULL;
2672                 return -ENOMEM;
2673         }
2674         
2675         rx_reset_buffers(info);
2676         return 0;
2677 }
2678
2679 static void rx_free_buffers(MGSLPC_INFO *info)
2680 {
2681         kfree(info->rx_buf);
2682         info->rx_buf = NULL;
2683         kfree(info->flag_buf);
2684         info->flag_buf = NULL;
2685 }
2686
2687 static int claim_resources(MGSLPC_INFO *info)
2688 {
2689         if (rx_alloc_buffers(info) < 0 ) {
2690                 printk( "Can't allocate rx buffer %s\n", info->device_name);
2691                 release_resources(info);
2692                 return -ENODEV;
2693         }
2694         return 0;
2695 }
2696
2697 static void release_resources(MGSLPC_INFO *info)
2698 {
2699         if (debug_level >= DEBUG_LEVEL_INFO)
2700                 printk("release_resources(%s)\n", info->device_name);
2701         rx_free_buffers(info);
2702 }
2703
2704 /* Add the specified device instance data structure to the
2705  * global linked list of devices and increment the device count.
2706  *
2707  * Arguments:           info    pointer to device instance data
2708  */
2709 static void mgslpc_add_device(MGSLPC_INFO *info)
2710 {
2711         info->next_device = NULL;
2712         info->line = mgslpc_device_count;
2713         sprintf(info->device_name,"ttySLP%d",info->line);
2714
2715         if (info->line < MAX_DEVICE_COUNT) {
2716                 if (maxframe[info->line])
2717                         info->max_frame_size = maxframe[info->line];
2718         }
2719
2720         mgslpc_device_count++;
2721
2722         if (!mgslpc_device_list)
2723                 mgslpc_device_list = info;
2724         else {
2725                 MGSLPC_INFO *current_dev = mgslpc_device_list;
2726                 while( current_dev->next_device )
2727                         current_dev = current_dev->next_device;
2728                 current_dev->next_device = info;
2729         }
2730
2731         if (info->max_frame_size < 4096)
2732                 info->max_frame_size = 4096;
2733         else if (info->max_frame_size > 65535)
2734                 info->max_frame_size = 65535;
2735
2736         printk( "SyncLink PC Card %s:IO=%04X IRQ=%d\n",
2737                 info->device_name, info->io_base, info->irq_level);
2738
2739 #if SYNCLINK_GENERIC_HDLC
2740         hdlcdev_init(info);
2741 #endif
2742         tty_port_register_device(&info->port, serial_driver, info->line,
2743                         &info->p_dev->dev);
2744 }
2745
2746 static void mgslpc_remove_device(MGSLPC_INFO *remove_info)
2747 {
2748         MGSLPC_INFO *info = mgslpc_device_list;
2749         MGSLPC_INFO *last = NULL;
2750
2751         while(info) {
2752                 if (info == remove_info) {
2753                         if (last)
2754                                 last->next_device = info->next_device;
2755                         else
2756                                 mgslpc_device_list = info->next_device;
2757                         tty_unregister_device(serial_driver, info->line);
2758 #if SYNCLINK_GENERIC_HDLC
2759                         hdlcdev_exit(info);
2760 #endif
2761                         release_resources(info);
2762                         tty_port_destroy(&info->port);
2763                         kfree(info);
2764                         mgslpc_device_count--;
2765                         return;
2766                 }
2767                 last = info;
2768                 info = info->next_device;
2769         }
2770 }
2771
2772 static const struct pcmcia_device_id mgslpc_ids[] = {
2773         PCMCIA_DEVICE_MANF_CARD(0x02c5, 0x0050),
2774         PCMCIA_DEVICE_NULL
2775 };
2776 MODULE_DEVICE_TABLE(pcmcia, mgslpc_ids);
2777
2778 static struct pcmcia_driver mgslpc_driver = {
2779         .owner          = THIS_MODULE,
2780         .name           = "synclink_cs",
2781         .probe          = mgslpc_probe,
2782         .remove         = mgslpc_detach,
2783         .id_table       = mgslpc_ids,
2784         .suspend        = mgslpc_suspend,
2785         .resume         = mgslpc_resume,
2786 };
2787
2788 static const struct tty_operations mgslpc_ops = {
2789         .open = mgslpc_open,
2790         .close = mgslpc_close,
2791         .write = mgslpc_write,
2792         .put_char = mgslpc_put_char,
2793         .flush_chars = mgslpc_flush_chars,
2794         .write_room = mgslpc_write_room,
2795         .chars_in_buffer = mgslpc_chars_in_buffer,
2796         .flush_buffer = mgslpc_flush_buffer,
2797         .ioctl = mgslpc_ioctl,
2798         .throttle = mgslpc_throttle,
2799         .unthrottle = mgslpc_unthrottle,
2800         .send_xchar = mgslpc_send_xchar,
2801         .break_ctl = mgslpc_break,
2802         .wait_until_sent = mgslpc_wait_until_sent,
2803         .set_termios = mgslpc_set_termios,
2804         .stop = tx_pause,
2805         .start = tx_release,
2806         .hangup = mgslpc_hangup,
2807         .tiocmget = tiocmget,
2808         .tiocmset = tiocmset,
2809         .get_icount = mgslpc_get_icount,
2810         .proc_fops = &mgslpc_proc_fops,
2811 };
2812
2813 static int __init synclink_cs_init(void)
2814 {
2815         int rc;
2816
2817         if (break_on_load) {
2818                 mgslpc_get_text_ptr();
2819                 BREAKPOINT();
2820         }
2821
2822         serial_driver = tty_alloc_driver(MAX_DEVICE_COUNT,
2823                         TTY_DRIVER_REAL_RAW |
2824                         TTY_DRIVER_DYNAMIC_DEV);
2825         if (IS_ERR(serial_driver)) {
2826                 rc = PTR_ERR(serial_driver);
2827                 goto err;
2828         }
2829
2830         /* Initialize the tty_driver structure */
2831         serial_driver->driver_name = "synclink_cs";
2832         serial_driver->name = "ttySLP";
2833         serial_driver->major = ttymajor;
2834         serial_driver->minor_start = 64;
2835         serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
2836         serial_driver->subtype = SERIAL_TYPE_NORMAL;
2837         serial_driver->init_termios = tty_std_termios;
2838         serial_driver->init_termios.c_cflag =
2839         B9600 | CS8 | CREAD | HUPCL | CLOCAL;
2840         tty_set_operations(serial_driver, &mgslpc_ops);
2841
2842         rc = tty_register_driver(serial_driver);
2843         if (rc < 0) {
2844                 printk(KERN_ERR "%s(%d):Couldn't register serial driver\n",
2845                                 __FILE__, __LINE__);
2846                 goto err_put_tty;
2847         }
2848
2849         rc = pcmcia_register_driver(&mgslpc_driver);
2850         if (rc < 0)
2851                 goto err_unreg_tty;
2852
2853         printk(KERN_INFO "%s %s, tty major#%d\n", driver_name, driver_version,
2854                         serial_driver->major);
2855
2856         return 0;
2857 err_unreg_tty:
2858         tty_unregister_driver(serial_driver);
2859 err_put_tty:
2860         put_tty_driver(serial_driver);
2861 err:
2862         return rc;
2863 }
2864
2865 static void __exit synclink_cs_exit(void)
2866 {
2867         pcmcia_unregister_driver(&mgslpc_driver);
2868         tty_unregister_driver(serial_driver);
2869         put_tty_driver(serial_driver);
2870 }
2871
2872 module_init(synclink_cs_init);
2873 module_exit(synclink_cs_exit);
2874
2875 static void mgslpc_set_rate(MGSLPC_INFO *info, unsigned char channel, unsigned int rate)
2876 {
2877         unsigned int M, N;
2878         unsigned char val;
2879
2880         /* note:standard BRG mode is broken in V3.2 chip
2881          * so enhanced mode is always used
2882          */
2883
2884         if (rate) {
2885                 N = 3686400 / rate;
2886                 if (!N)
2887                         N = 1;
2888                 N >>= 1;
2889                 for (M = 1; N > 64 && M < 16; M++)
2890                         N >>= 1;
2891                 N--;
2892
2893                 /* BGR[5..0] = N
2894                  * BGR[9..6] = M
2895                  * BGR[7..0] contained in BGR register
2896                  * BGR[9..8] contained in CCR2[7..6]
2897                  * divisor = (N+1)*2^M
2898                  *
2899                  * Note: M *must* not be zero (causes asymetric duty cycle)
2900                  */
2901                 write_reg(info, (unsigned char) (channel + BGR),
2902                                   (unsigned char) ((M << 6) + N));
2903                 val = read_reg(info, (unsigned char) (channel + CCR2)) & 0x3f;
2904                 val |= ((M << 4) & 0xc0);
2905                 write_reg(info, (unsigned char) (channel + CCR2), val);
2906         }
2907 }
2908
2909 /* Enabled the AUX clock output at the specified frequency.
2910  */
2911 static void enable_auxclk(MGSLPC_INFO *info)
2912 {
2913         unsigned char val;
2914
2915         /* MODE
2916          *
2917          * 07..06  MDS[1..0] 10 = transparent HDLC mode
2918          * 05      ADM Address Mode, 0 = no addr recognition
2919          * 04      TMD Timer Mode, 0 = external
2920          * 03      RAC Receiver Active, 0 = inactive
2921          * 02      RTS 0=RTS active during xmit, 1=RTS always active
2922          * 01      TRS Timer Resolution, 1=512
2923          * 00      TLP Test Loop, 0 = no loop
2924          *
2925          * 1000 0010
2926          */
2927         val = 0x82;
2928
2929         /* channel B RTS is used to enable AUXCLK driver on SP505 */
2930         if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
2931                 val |= BIT2;
2932         write_reg(info, CHB + MODE, val);
2933
2934         /* CCR0
2935          *
2936          * 07      PU Power Up, 1=active, 0=power down
2937          * 06      MCE Master Clock Enable, 1=enabled
2938          * 05      Reserved, 0
2939          * 04..02  SC[2..0] Encoding
2940          * 01..00  SM[1..0] Serial Mode, 00=HDLC
2941          *
2942          * 11000000
2943          */
2944         write_reg(info, CHB + CCR0, 0xc0);
2945
2946         /* CCR1
2947          *
2948          * 07      SFLG Shared Flag, 0 = disable shared flags
2949          * 06      GALP Go Active On Loop, 0 = not used
2950          * 05      GLP Go On Loop, 0 = not used
2951          * 04      ODS Output Driver Select, 1=TxD is push-pull output
2952          * 03      ITF Interframe Time Fill, 0=mark, 1=flag
2953          * 02..00  CM[2..0] Clock Mode
2954          *
2955          * 0001 0111
2956          */
2957         write_reg(info, CHB + CCR1, 0x17);
2958
2959         /* CCR2 (Channel B)
2960          *
2961          * 07..06  BGR[9..8] Baud rate bits 9..8
2962          * 05      BDF Baud rate divisor factor, 0=1, 1=BGR value
2963          * 04      SSEL Clock source select, 1=submode b
2964          * 03      TOE 0=TxCLK is input, 1=TxCLK is output
2965          * 02      RWX Read/Write Exchange 0=disabled
2966          * 01      C32, CRC select, 0=CRC-16, 1=CRC-32
2967          * 00      DIV, data inversion 0=disabled, 1=enabled
2968          *
2969          * 0011 1000
2970          */
2971         if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
2972                 write_reg(info, CHB + CCR2, 0x38);
2973         else
2974                 write_reg(info, CHB + CCR2, 0x30);
2975
2976         /* CCR4
2977          *
2978          * 07      MCK4 Master Clock Divide by 4, 1=enabled
2979          * 06      EBRG Enhanced Baud Rate Generator Mode, 1=enabled
2980          * 05      TST1 Test Pin, 0=normal operation
2981          * 04      ICD Ivert Carrier Detect, 1=enabled (active low)
2982          * 03..02  Reserved, must be 0
2983          * 01..00  RFT[1..0] RxFIFO Threshold 00=32 bytes
2984          *
2985          * 0101 0000
2986          */
2987         write_reg(info, CHB + CCR4, 0x50);
2988
2989         /* if auxclk not enabled, set internal BRG so
2990          * CTS transitions can be detected (requires TxC)
2991          */
2992         if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
2993                 mgslpc_set_rate(info, CHB, info->params.clock_speed);
2994         else
2995                 mgslpc_set_rate(info, CHB, 921600);
2996 }
2997
2998 static void loopback_enable(MGSLPC_INFO *info)
2999 {
3000         unsigned char val;
3001
3002         /* CCR1:02..00  CM[2..0] Clock Mode = 111 (clock mode 7) */
3003         val = read_reg(info, CHA + CCR1) | (BIT2 + BIT1 + BIT0);
3004         write_reg(info, CHA + CCR1, val);
3005
3006         /* CCR2:04 SSEL Clock source select, 1=submode b */
3007         val = read_reg(info, CHA + CCR2) | (BIT4 + BIT5);
3008         write_reg(info, CHA + CCR2, val);
3009
3010         /* set LinkSpeed if available, otherwise default to 2Mbps */
3011         if (info->params.clock_speed)
3012                 mgslpc_set_rate(info, CHA, info->params.clock_speed);
3013         else
3014                 mgslpc_set_rate(info, CHA, 1843200);
3015
3016         /* MODE:00 TLP Test Loop, 1=loopback enabled */
3017         val = read_reg(info, CHA + MODE) | BIT0;
3018         write_reg(info, CHA + MODE, val);
3019 }
3020
3021 static void hdlc_mode(MGSLPC_INFO *info)
3022 {
3023         unsigned char val;
3024         unsigned char clkmode, clksubmode;
3025
3026         /* disable all interrupts */
3027         irq_disable(info, CHA, 0xffff);
3028         irq_disable(info, CHB, 0xffff);
3029         port_irq_disable(info, 0xff);
3030
3031         /* assume clock mode 0a, rcv=RxC xmt=TxC */
3032         clkmode = clksubmode = 0;
3033         if (info->params.flags & HDLC_FLAG_RXC_DPLL
3034             && info->params.flags & HDLC_FLAG_TXC_DPLL) {
3035                 /* clock mode 7a, rcv = DPLL, xmt = DPLL */
3036                 clkmode = 7;
3037         } else if (info->params.flags & HDLC_FLAG_RXC_BRG
3038                  && info->params.flags & HDLC_FLAG_TXC_BRG) {
3039                 /* clock mode 7b, rcv = BRG, xmt = BRG */
3040                 clkmode = 7;
3041                 clksubmode = 1;
3042         } else if (info->params.flags & HDLC_FLAG_RXC_DPLL) {
3043                 if (info->params.flags & HDLC_FLAG_TXC_BRG) {
3044                         /* clock mode 6b, rcv = DPLL, xmt = BRG/16 */
3045                         clkmode = 6;
3046                         clksubmode = 1;
3047                 } else {
3048                         /* clock mode 6a, rcv = DPLL, xmt = TxC */
3049                         clkmode = 6;
3050                 }
3051         } else if (info->params.flags & HDLC_FLAG_TXC_BRG) {
3052                 /* clock mode 0b, rcv = RxC, xmt = BRG */
3053                 clksubmode = 1;
3054         }
3055
3056         /* MODE
3057          *
3058          * 07..06  MDS[1..0] 10 = transparent HDLC mode
3059          * 05      ADM Address Mode, 0 = no addr recognition
3060          * 04      TMD Timer Mode, 0 = external
3061          * 03      RAC Receiver Active, 0 = inactive
3062          * 02      RTS 0=RTS active during xmit, 1=RTS always active
3063          * 01      TRS Timer Resolution, 1=512
3064          * 00      TLP Test Loop, 0 = no loop
3065          *
3066          * 1000 0010
3067          */
3068         val = 0x82;
3069         if (info->params.loopback)
3070                 val |= BIT0;
3071
3072         /* preserve RTS state */
3073         if (info->serial_signals & SerialSignal_RTS)
3074                 val |= BIT2;
3075         write_reg(info, CHA + MODE, val);
3076
3077         /* CCR0
3078          *
3079          * 07      PU Power Up, 1=active, 0=power down
3080          * 06      MCE Master Clock Enable, 1=enabled
3081          * 05      Reserved, 0
3082          * 04..02  SC[2..0] Encoding
3083          * 01..00  SM[1..0] Serial Mode, 00=HDLC
3084          *
3085          * 11000000
3086          */
3087         val = 0xc0;
3088         switch (info->params.encoding)
3089         {
3090         case HDLC_ENCODING_NRZI:
3091                 val |= BIT3;
3092                 break;
3093         case HDLC_ENCODING_BIPHASE_SPACE:
3094                 val |= BIT4;
3095                 break;          // FM0
3096         case HDLC_ENCODING_BIPHASE_MARK:
3097                 val |= BIT4 + BIT2;
3098                 break;          // FM1
3099         case HDLC_ENCODING_BIPHASE_LEVEL:
3100                 val |= BIT4 + BIT3;
3101                 break;          // Manchester
3102         }
3103         write_reg(info, CHA + CCR0, val);
3104
3105         /* CCR1
3106          *
3107          * 07      SFLG Shared Flag, 0 = disable shared flags
3108          * 06      GALP Go Active On Loop, 0 = not used
3109          * 05      GLP Go On Loop, 0 = not used
3110          * 04      ODS Output Driver Select, 1=TxD is push-pull output
3111          * 03      ITF Interframe Time Fill, 0=mark, 1=flag
3112          * 02..00  CM[2..0] Clock Mode
3113          *
3114          * 0001 0000
3115          */
3116         val = 0x10 + clkmode;
3117         write_reg(info, CHA + CCR1, val);
3118
3119         /* CCR2
3120          *
3121          * 07..06  BGR[9..8] Baud rate bits 9..8
3122          * 05      BDF Baud rate divisor factor, 0=1, 1=BGR value
3123          * 04      SSEL Clock source select, 1=submode b
3124          * 03      TOE 0=TxCLK is input, 0=TxCLK is input
3125          * 02      RWX Read/Write Exchange 0=disabled
3126          * 01      C32, CRC select, 0=CRC-16, 1=CRC-32
3127          * 00      DIV, data inversion 0=disabled, 1=enabled
3128          *
3129          * 0000 0000
3130          */
3131         val = 0x00;
3132         if (clkmode == 2 || clkmode == 3 || clkmode == 6
3133             || clkmode == 7 || (clkmode == 0 && clksubmode == 1))
3134                 val |= BIT5;
3135         if (clksubmode)
3136                 val |= BIT4;
3137         if (info->params.crc_type == HDLC_CRC_32_CCITT)
3138                 val |= BIT1;
3139         if (info->params.encoding == HDLC_ENCODING_NRZB)
3140                 val |= BIT0;
3141         write_reg(info, CHA + CCR2, val);
3142
3143         /* CCR3
3144          *
3145          * 07..06  PRE[1..0] Preamble count 00=1, 01=2, 10=4, 11=8
3146          * 05      EPT Enable preamble transmission, 1=enabled
3147          * 04      RADD Receive address pushed to FIFO, 0=disabled
3148          * 03      CRL CRC Reset Level, 0=FFFF
3149          * 02      RCRC Rx CRC 0=On 1=Off
3150          * 01      TCRC Tx CRC 0=On 1=Off
3151          * 00      PSD DPLL Phase Shift Disable
3152          *
3153          * 0000 0000
3154          */
3155         val = 0x00;
3156         if (info->params.crc_type == HDLC_CRC_NONE)
3157                 val |= BIT2 + BIT1;
3158         if (info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE)
3159                 val |= BIT5;
3160         switch (info->params.preamble_length)
3161         {
3162         case HDLC_PREAMBLE_LENGTH_16BITS:
3163                 val |= BIT6;
3164                 break;
3165         case HDLC_PREAMBLE_LENGTH_32BITS:
3166                 val |= BIT6;
3167                 break;
3168         case HDLC_PREAMBLE_LENGTH_64BITS:
3169                 val |= BIT7 + BIT6;
3170                 break;
3171         }
3172         write_reg(info, CHA + CCR3, val);
3173
3174         /* PRE - Preamble pattern */
3175         val = 0;
3176         switch (info->params.preamble)
3177         {
3178         case HDLC_PREAMBLE_PATTERN_FLAGS: val = 0x7e; break;
3179         case HDLC_PREAMBLE_PATTERN_10:    val = 0xaa; break;
3180         case HDLC_PREAMBLE_PATTERN_01:    val = 0x55; break;
3181         case HDLC_PREAMBLE_PATTERN_ONES:  val = 0xff; break;
3182         }
3183         write_reg(info, CHA + PRE, val);
3184
3185         /* CCR4
3186          *
3187          * 07      MCK4 Master Clock Divide by 4, 1=enabled
3188          * 06      EBRG Enhanced Baud Rate Generator Mode, 1=enabled
3189          * 05      TST1 Test Pin, 0=normal operation
3190          * 04      ICD Ivert Carrier Detect, 1=enabled (active low)
3191          * 03..02  Reserved, must be 0
3192          * 01..00  RFT[1..0] RxFIFO Threshold 00=32 bytes
3193          *
3194          * 0101 0000
3195          */
3196         val = 0x50;
3197         write_reg(info, CHA + CCR4, val);
3198         if (info->params.flags & HDLC_FLAG_RXC_DPLL)
3199                 mgslpc_set_rate(info, CHA, info->params.clock_speed * 16);
3200         else
3201                 mgslpc_set_rate(info, CHA, info->params.clock_speed);
3202
3203         /* RLCR Receive length check register
3204          *
3205          * 7     1=enable receive length check
3206          * 6..0  Max frame length = (RL + 1) * 32
3207          */
3208         write_reg(info, CHA + RLCR, 0);
3209
3210         /* XBCH Transmit Byte Count High
3211          *
3212          * 07      DMA mode, 0 = interrupt driven
3213          * 06      NRM, 0=ABM (ignored)
3214          * 05      CAS Carrier Auto Start
3215          * 04      XC Transmit Continuously (ignored)
3216          * 03..00  XBC[10..8] Transmit byte count bits 10..8
3217          *
3218          * 0000 0000
3219          */
3220         val = 0x00;
3221         if (info->params.flags & HDLC_FLAG_AUTO_DCD)
3222                 val |= BIT5;
3223         write_reg(info, CHA + XBCH, val);
3224         enable_auxclk(info);
3225         if (info->params.loopback || info->testing_irq)
3226                 loopback_enable(info);
3227         if (info->params.flags & HDLC_FLAG_AUTO_CTS)
3228         {
3229                 irq_enable(info, CHB, IRQ_CTS);
3230                 /* PVR[3] 1=AUTO CTS active */
3231                 set_reg_bits(info, CHA + PVR, BIT3);
3232         } else
3233                 clear_reg_bits(info, CHA + PVR, BIT3);
3234
3235         irq_enable(info, CHA,
3236                          IRQ_RXEOM + IRQ_RXFIFO + IRQ_ALLSENT +
3237                          IRQ_UNDERRUN + IRQ_TXFIFO);
3238         issue_command(info, CHA, CMD_TXRESET + CMD_RXRESET);
3239         wait_command_complete(info, CHA);
3240         read_reg16(info, CHA + ISR);    /* clear pending IRQs */
3241
3242         /* Master clock mode enabled above to allow reset commands
3243          * to complete even if no data clocks are present.
3244          *
3245          * Disable master clock mode for normal communications because
3246          * V3.2 of the ESCC2 has a bug that prevents the transmit all sent
3247          * IRQ when in master clock mode.
3248          *
3249          * Leave master clock mode enabled for IRQ test because the
3250          * timer IRQ used by the test can only happen in master clock mode.
3251          */
3252         if (!info->testing_irq)
3253                 clear_reg_bits(info, CHA + CCR0, BIT6);
3254
3255         tx_set_idle(info);
3256
3257         tx_stop(info);
3258         rx_stop(info);
3259 }
3260
3261 static void rx_stop(MGSLPC_INFO *info)
3262 {
3263         if (debug_level >= DEBUG_LEVEL_ISR)
3264                 printk("%s(%d):rx_stop(%s)\n",
3265                          __FILE__,__LINE__, info->device_name );
3266
3267         /* MODE:03 RAC Receiver Active, 0=inactive */
3268         clear_reg_bits(info, CHA + MODE, BIT3);
3269
3270         info->rx_enabled = false;
3271         info->rx_overflow = false;
3272 }
3273
3274 static void rx_start(MGSLPC_INFO *info)
3275 {
3276         if (debug_level >= DEBUG_LEVEL_ISR)
3277                 printk("%s(%d):rx_start(%s)\n",
3278                          __FILE__,__LINE__, info->device_name );
3279
3280         rx_reset_buffers(info);
3281         info->rx_enabled = false;
3282         info->rx_overflow = false;
3283
3284         /* MODE:03 RAC Receiver Active, 1=active */
3285         set_reg_bits(info, CHA + MODE, BIT3);
3286
3287         info->rx_enabled = true;
3288 }
3289
3290 static void tx_start(MGSLPC_INFO *info, struct tty_struct *tty)
3291 {
3292         if (debug_level >= DEBUG_LEVEL_ISR)
3293                 printk("%s(%d):tx_start(%s)\n",
3294                          __FILE__,__LINE__, info->device_name );