w1: w1_therm: Add force-pullup option for "broken" sensors
[~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         int count;
107         unsigned char status;
108         char data[1];
109 } RXBUF;
110
111 /* The queue of BH actions to be performed */
112
113 #define BH_RECEIVE  1
114 #define BH_TRANSMIT 2
115 #define BH_STATUS   4
116
117 #define IO_PIN_SHUTDOWN_LIMIT 100
118
119 #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
120
121 struct _input_signal_events {
122         int     ri_up;
123         int     ri_down;
124         int     dsr_up;
125         int     dsr_down;
126         int     dcd_up;
127         int     dcd_down;
128         int     cts_up;
129         int     cts_down;
130 };
131
132
133 /*
134  * Device instance data structure
135  */
136
137 typedef struct _mgslpc_info {
138         struct tty_port         port;
139         void *if_ptr;   /* General purpose pointer (used by SPPP) */
140         int                     magic;
141         int                     line;
142
143         struct mgsl_icount      icount;
144
145         int                     timeout;
146         int                     x_char;         /* xon/xoff character */
147         unsigned char           read_status_mask;
148         unsigned char           ignore_status_mask;
149
150         unsigned char *tx_buf;
151         int            tx_put;
152         int            tx_get;
153         int            tx_count;
154
155         /* circular list of fixed length rx buffers */
156
157         unsigned char  *rx_buf;        /* memory allocated for all rx buffers */
158         int            rx_buf_total_size; /* size of memory allocated for rx buffers */
159         int            rx_put;         /* index of next empty rx buffer */
160         int            rx_get;         /* index of next full rx buffer */
161         int            rx_buf_size;    /* size in bytes of single rx buffer */
162         int            rx_buf_count;   /* total number of rx buffers */
163         int            rx_frame_count; /* number of full rx buffers */
164
165         wait_queue_head_t       status_event_wait_q;
166         wait_queue_head_t       event_wait_q;
167         struct timer_list       tx_timer;       /* HDLC transmit timeout timer */
168         struct _mgslpc_info     *next_device;   /* device list link */
169
170         unsigned short imra_value;
171         unsigned short imrb_value;
172         unsigned char  pim_value;
173
174         spinlock_t lock;
175         struct work_struct task;                /* task structure for scheduling bh */
176
177         u32 max_frame_size;
178
179         u32 pending_bh;
180
181         bool bh_running;
182         bool bh_requested;
183
184         int dcd_chkcount; /* check counts to prevent */
185         int cts_chkcount; /* too many IRQs if a signal */
186         int dsr_chkcount; /* is floating */
187         int ri_chkcount;
188
189         bool rx_enabled;
190         bool rx_overflow;
191
192         bool tx_enabled;
193         bool tx_active;
194         bool tx_aborting;
195         u32 idle_mode;
196
197         int if_mode; /* serial interface selection (RS-232, v.35 etc) */
198
199         char device_name[25];           /* device instance name */
200
201         unsigned int io_base;   /* base I/O address of adapter */
202         unsigned int irq_level;
203
204         MGSL_PARAMS params;             /* communications parameters */
205
206         unsigned char serial_signals;   /* current serial signal states */
207
208         bool irq_occurred;              /* for diagnostics use */
209         char testing_irq;
210         unsigned int init_error;        /* startup error (DIAGS)        */
211
212         char flag_buf[MAX_ASYNC_BUFFER_SIZE];
213         bool drop_rts_on_tx_done;
214
215         struct  _input_signal_events    input_signal_events;
216
217         /* PCMCIA support */
218         struct pcmcia_device    *p_dev;
219         int                   stop;
220
221         /* SPPP/Cisco HDLC device parts */
222         int netcount;
223         spinlock_t netlock;
224
225 #if SYNCLINK_GENERIC_HDLC
226         struct net_device *netdev;
227 #endif
228
229 } MGSLPC_INFO;
230
231 #define MGSLPC_MAGIC 0x5402
232
233 /*
234  * The size of the serial xmit buffer is 1 page, or 4096 bytes
235  */
236 #define TXBUFSIZE 4096
237
238
239 #define CHA     0x00   /* channel A offset */
240 #define CHB     0x40   /* channel B offset */
241
242 /*
243  *  FIXME: PPC has PVR defined in asm/reg.h.  For now we just undef it.
244  */
245 #undef PVR
246
247 #define RXFIFO  0
248 #define TXFIFO  0
249 #define STAR    0x20
250 #define CMDR    0x20
251 #define RSTA    0x21
252 #define PRE     0x21
253 #define MODE    0x22
254 #define TIMR    0x23
255 #define XAD1    0x24
256 #define XAD2    0x25
257 #define RAH1    0x26
258 #define RAH2    0x27
259 #define DAFO    0x27
260 #define RAL1    0x28
261 #define RFC     0x28
262 #define RHCR    0x29
263 #define RAL2    0x29
264 #define RBCL    0x2a
265 #define XBCL    0x2a
266 #define RBCH    0x2b
267 #define XBCH    0x2b
268 #define CCR0    0x2c
269 #define CCR1    0x2d
270 #define CCR2    0x2e
271 #define CCR3    0x2f
272 #define VSTR    0x34
273 #define BGR     0x34
274 #define RLCR    0x35
275 #define AML     0x36
276 #define AMH     0x37
277 #define GIS     0x38
278 #define IVA     0x38
279 #define IPC     0x39
280 #define ISR     0x3a
281 #define IMR     0x3a
282 #define PVR     0x3c
283 #define PIS     0x3d
284 #define PIM     0x3d
285 #define PCR     0x3e
286 #define CCR4    0x3f
287
288 // IMR/ISR
289
290 #define IRQ_BREAK_ON    BIT15   // rx break detected
291 #define IRQ_DATAOVERRUN BIT14   // receive data overflow
292 #define IRQ_ALLSENT     BIT13   // all sent
293 #define IRQ_UNDERRUN    BIT12   // transmit data underrun
294 #define IRQ_TIMER       BIT11   // timer interrupt
295 #define IRQ_CTS         BIT10   // CTS status change
296 #define IRQ_TXREPEAT    BIT9    // tx message repeat
297 #define IRQ_TXFIFO      BIT8    // transmit pool ready
298 #define IRQ_RXEOM       BIT7    // receive message end
299 #define IRQ_EXITHUNT    BIT6    // receive frame start
300 #define IRQ_RXTIME      BIT6    // rx char timeout
301 #define IRQ_DCD         BIT2    // carrier detect status change
302 #define IRQ_OVERRUN     BIT1    // receive frame overflow
303 #define IRQ_RXFIFO      BIT0    // receive pool full
304
305 // STAR
306
307 #define XFW   BIT6              // transmit FIFO write enable
308 #define CEC   BIT2              // command executing
309 #define CTS   BIT1              // CTS state
310
311 #define PVR_DTR      BIT0
312 #define PVR_DSR      BIT1
313 #define PVR_RI       BIT2
314 #define PVR_AUTOCTS  BIT3
315 #define PVR_RS232    0x20   /* 0010b */
316 #define PVR_V35      0xe0   /* 1110b */
317 #define PVR_RS422    0x40   /* 0100b */
318
319 /* Register access functions */
320
321 #define write_reg(info, reg, val) outb((val),(info)->io_base + (reg))
322 #define read_reg(info, reg) inb((info)->io_base + (reg))
323
324 #define read_reg16(info, reg) inw((info)->io_base + (reg))
325 #define write_reg16(info, reg, val) outw((val), (info)->io_base + (reg))
326
327 #define set_reg_bits(info, reg, mask) \
328         write_reg(info, (reg), \
329                  (unsigned char) (read_reg(info, (reg)) | (mask)))
330 #define clear_reg_bits(info, reg, mask) \
331         write_reg(info, (reg), \
332                  (unsigned char) (read_reg(info, (reg)) & ~(mask)))
333 /*
334  * interrupt enable/disable routines
335  */
336 static void irq_disable(MGSLPC_INFO *info, unsigned char channel, unsigned short mask)
337 {
338         if (channel == CHA) {
339                 info->imra_value |= mask;
340                 write_reg16(info, CHA + IMR, info->imra_value);
341         } else {
342                 info->imrb_value |= mask;
343                 write_reg16(info, CHB + IMR, info->imrb_value);
344         }
345 }
346 static void irq_enable(MGSLPC_INFO *info, unsigned char channel, unsigned short mask)
347 {
348         if (channel == CHA) {
349                 info->imra_value &= ~mask;
350                 write_reg16(info, CHA + IMR, info->imra_value);
351         } else {
352                 info->imrb_value &= ~mask;
353                 write_reg16(info, CHB + IMR, info->imrb_value);
354         }
355 }
356
357 #define port_irq_disable(info, mask) \
358         { info->pim_value |= (mask); write_reg(info, PIM, info->pim_value); }
359
360 #define port_irq_enable(info, mask) \
361         { info->pim_value &= ~(mask); write_reg(info, PIM, info->pim_value); }
362
363 static void rx_start(MGSLPC_INFO *info);
364 static void rx_stop(MGSLPC_INFO *info);
365
366 static void tx_start(MGSLPC_INFO *info, struct tty_struct *tty);
367 static void tx_stop(MGSLPC_INFO *info);
368 static void tx_set_idle(MGSLPC_INFO *info);
369
370 static void get_signals(MGSLPC_INFO *info);
371 static void set_signals(MGSLPC_INFO *info);
372
373 static void reset_device(MGSLPC_INFO *info);
374
375 static void hdlc_mode(MGSLPC_INFO *info);
376 static void async_mode(MGSLPC_INFO *info);
377
378 static void tx_timeout(unsigned long context);
379
380 static int carrier_raised(struct tty_port *port);
381 static void dtr_rts(struct tty_port *port, int onoff);
382
383 #if SYNCLINK_GENERIC_HDLC
384 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
385 static void hdlcdev_tx_done(MGSLPC_INFO *info);
386 static void hdlcdev_rx(MGSLPC_INFO *info, char *buf, int size);
387 static int  hdlcdev_init(MGSLPC_INFO *info);
388 static void hdlcdev_exit(MGSLPC_INFO *info);
389 #endif
390
391 static void trace_block(MGSLPC_INFO *info,const char* data, int count, int xmit);
392
393 static bool register_test(MGSLPC_INFO *info);
394 static bool irq_test(MGSLPC_INFO *info);
395 static int adapter_test(MGSLPC_INFO *info);
396
397 static int claim_resources(MGSLPC_INFO *info);
398 static void release_resources(MGSLPC_INFO *info);
399 static int mgslpc_add_device(MGSLPC_INFO *info);
400 static void mgslpc_remove_device(MGSLPC_INFO *info);
401
402 static bool rx_get_frame(MGSLPC_INFO *info, struct tty_struct *tty);
403 static void rx_reset_buffers(MGSLPC_INFO *info);
404 static int  rx_alloc_buffers(MGSLPC_INFO *info);
405 static void rx_free_buffers(MGSLPC_INFO *info);
406
407 static irqreturn_t mgslpc_isr(int irq, void *dev_id);
408
409 /*
410  * Bottom half interrupt handlers
411  */
412 static void bh_handler(struct work_struct *work);
413 static void bh_transmit(MGSLPC_INFO *info, struct tty_struct *tty);
414 static void bh_status(MGSLPC_INFO *info);
415
416 /*
417  * ioctl handlers
418  */
419 static int tiocmget(struct tty_struct *tty);
420 static int tiocmset(struct tty_struct *tty,
421                                         unsigned int set, unsigned int clear);
422 static int get_stats(MGSLPC_INFO *info, struct mgsl_icount __user *user_icount);
423 static int get_params(MGSLPC_INFO *info, MGSL_PARAMS __user *user_params);
424 static int set_params(MGSLPC_INFO *info, MGSL_PARAMS __user *new_params, struct tty_struct *tty);
425 static int get_txidle(MGSLPC_INFO *info, int __user *idle_mode);
426 static int set_txidle(MGSLPC_INFO *info, int idle_mode);
427 static int set_txenable(MGSLPC_INFO *info, int enable, struct tty_struct *tty);
428 static int tx_abort(MGSLPC_INFO *info);
429 static int set_rxenable(MGSLPC_INFO *info, int enable);
430 static int wait_events(MGSLPC_INFO *info, int __user *mask);
431
432 static MGSLPC_INFO *mgslpc_device_list = NULL;
433 static int mgslpc_device_count = 0;
434
435 /*
436  * Set this param to non-zero to load eax with the
437  * .text section address and breakpoint on module load.
438  * This is useful for use with gdb and add-symbol-file command.
439  */
440 static bool break_on_load=0;
441
442 /*
443  * Driver major number, defaults to zero to get auto
444  * assigned major number. May be forced as module parameter.
445  */
446 static int ttymajor=0;
447
448 static int debug_level = 0;
449 static int maxframe[MAX_DEVICE_COUNT] = {0,};
450
451 module_param(break_on_load, bool, 0);
452 module_param(ttymajor, int, 0);
453 module_param(debug_level, int, 0);
454 module_param_array(maxframe, int, NULL, 0);
455
456 MODULE_LICENSE("GPL");
457
458 static char *driver_name = "SyncLink PC Card driver";
459 static char *driver_version = "$Revision: 4.34 $";
460
461 static struct tty_driver *serial_driver;
462
463 /* number of characters left in xmit buffer before we ask for more */
464 #define WAKEUP_CHARS 256
465
466 static void mgslpc_change_params(MGSLPC_INFO *info, struct tty_struct *tty);
467 static void mgslpc_wait_until_sent(struct tty_struct *tty, int timeout);
468
469 /* PCMCIA prototypes */
470
471 static int mgslpc_config(struct pcmcia_device *link);
472 static void mgslpc_release(u_long arg);
473 static void mgslpc_detach(struct pcmcia_device *p_dev);
474
475 /*
476  * 1st function defined in .text section. Calling this function in
477  * init_module() followed by a breakpoint allows a remote debugger
478  * (gdb) to get the .text address for the add-symbol-file command.
479  * This allows remote debugging of dynamically loadable modules.
480  */
481 static void* mgslpc_get_text_ptr(void)
482 {
483         return mgslpc_get_text_ptr;
484 }
485
486 /**
487  * line discipline callback wrappers
488  *
489  * The wrappers maintain line discipline references
490  * while calling into the line discipline.
491  *
492  * ldisc_receive_buf  - pass receive data to line discipline
493  */
494
495 static void ldisc_receive_buf(struct tty_struct *tty,
496                               const __u8 *data, char *flags, int count)
497 {
498         struct tty_ldisc *ld;
499         if (!tty)
500                 return;
501         ld = tty_ldisc_ref(tty);
502         if (ld) {
503                 if (ld->ops->receive_buf)
504                         ld->ops->receive_buf(tty, data, flags, count);
505                 tty_ldisc_deref(ld);
506         }
507 }
508
509 static const struct tty_port_operations mgslpc_port_ops = {
510         .carrier_raised = carrier_raised,
511         .dtr_rts = dtr_rts
512 };
513
514 static int mgslpc_probe(struct pcmcia_device *link)
515 {
516         MGSLPC_INFO *info;
517         int ret;
518
519         if (debug_level >= DEBUG_LEVEL_INFO)
520                 printk("mgslpc_attach\n");
521
522         info = kzalloc(sizeof(MGSLPC_INFO), GFP_KERNEL);
523         if (!info) {
524                 printk("Error can't allocate device instance data\n");
525                 return -ENOMEM;
526         }
527
528         info->magic = MGSLPC_MAGIC;
529         tty_port_init(&info->port);
530         info->port.ops = &mgslpc_port_ops;
531         INIT_WORK(&info->task, bh_handler);
532         info->max_frame_size = 4096;
533         info->port.close_delay = 5*HZ/10;
534         info->port.closing_wait = 30*HZ;
535         init_waitqueue_head(&info->status_event_wait_q);
536         init_waitqueue_head(&info->event_wait_q);
537         spin_lock_init(&info->lock);
538         spin_lock_init(&info->netlock);
539         memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
540         info->idle_mode = HDLC_TXIDLE_FLAGS;
541         info->imra_value = 0xffff;
542         info->imrb_value = 0xffff;
543         info->pim_value = 0xff;
544
545         info->p_dev = link;
546         link->priv = info;
547
548         /* Initialize the struct pcmcia_device structure */
549
550         ret = mgslpc_config(link);
551         if (ret != 0)
552                 goto failed;
553
554         ret = mgslpc_add_device(info);
555         if (ret != 0)
556                 goto failed_release;
557
558         return 0;
559
560 failed_release:
561         mgslpc_release((u_long)link);
562 failed:
563         tty_port_destroy(&info->port);
564         kfree(info);
565         return ret;
566 }
567
568 /* Card has been inserted.
569  */
570
571 static int mgslpc_ioprobe(struct pcmcia_device *p_dev, void *priv_data)
572 {
573         return pcmcia_request_io(p_dev);
574 }
575
576 static int mgslpc_config(struct pcmcia_device *link)
577 {
578         MGSLPC_INFO *info = link->priv;
579         int ret;
580
581         if (debug_level >= DEBUG_LEVEL_INFO)
582                 printk("mgslpc_config(0x%p)\n", link);
583
584         link->config_flags |= CONF_ENABLE_IRQ | CONF_AUTO_SET_IO;
585
586         ret = pcmcia_loop_config(link, mgslpc_ioprobe, NULL);
587         if (ret != 0)
588                 goto failed;
589
590         link->config_index = 8;
591         link->config_regs = PRESENT_OPTION;
592
593         ret = pcmcia_request_irq(link, mgslpc_isr);
594         if (ret)
595                 goto failed;
596         ret = pcmcia_enable_device(link);
597         if (ret)
598                 goto failed;
599
600         info->io_base = link->resource[0]->start;
601         info->irq_level = link->irq;
602         return 0;
603
604 failed:
605         mgslpc_release((u_long)link);
606         return -ENODEV;
607 }
608
609 /* Card has been removed.
610  * Unregister device and release PCMCIA configuration.
611  * If device is open, postpone until it is closed.
612  */
613 static void mgslpc_release(u_long arg)
614 {
615         struct pcmcia_device *link = (struct pcmcia_device *)arg;
616
617         if (debug_level >= DEBUG_LEVEL_INFO)
618                 printk("mgslpc_release(0x%p)\n", link);
619
620         pcmcia_disable_device(link);
621 }
622
623 static void mgslpc_detach(struct pcmcia_device *link)
624 {
625         if (debug_level >= DEBUG_LEVEL_INFO)
626                 printk("mgslpc_detach(0x%p)\n", link);
627
628         ((MGSLPC_INFO *)link->priv)->stop = 1;
629         mgslpc_release((u_long)link);
630
631         mgslpc_remove_device((MGSLPC_INFO *)link->priv);
632 }
633
634 static int mgslpc_suspend(struct pcmcia_device *link)
635 {
636         MGSLPC_INFO *info = link->priv;
637
638         info->stop = 1;
639
640         return 0;
641 }
642
643 static int mgslpc_resume(struct pcmcia_device *link)
644 {
645         MGSLPC_INFO *info = link->priv;
646
647         info->stop = 0;
648
649         return 0;
650 }
651
652
653 static inline bool mgslpc_paranoia_check(MGSLPC_INFO *info,
654                                         char *name, const char *routine)
655 {
656 #ifdef MGSLPC_PARANOIA_CHECK
657         static const char *badmagic =
658                 "Warning: bad magic number for mgsl struct (%s) in %s\n";
659         static const char *badinfo =
660                 "Warning: null mgslpc_info for (%s) in %s\n";
661
662         if (!info) {
663                 printk(badinfo, name, routine);
664                 return true;
665         }
666         if (info->magic != MGSLPC_MAGIC) {
667                 printk(badmagic, name, routine);
668                 return true;
669         }
670 #else
671         if (!info)
672                 return true;
673 #endif
674         return false;
675 }
676
677
678 #define CMD_RXFIFO      BIT7    // release current rx FIFO
679 #define CMD_RXRESET     BIT6    // receiver reset
680 #define CMD_RXFIFO_READ BIT5
681 #define CMD_START_TIMER BIT4
682 #define CMD_TXFIFO      BIT3    // release current tx FIFO
683 #define CMD_TXEOM       BIT1    // transmit end message
684 #define CMD_TXRESET     BIT0    // transmit reset
685
686 static bool wait_command_complete(MGSLPC_INFO *info, unsigned char channel)
687 {
688         int i = 0;
689         /* wait for command completion */
690         while (read_reg(info, (unsigned char)(channel+STAR)) & BIT2) {
691                 udelay(1);
692                 if (i++ == 1000)
693                         return false;
694         }
695         return true;
696 }
697
698 static void issue_command(MGSLPC_INFO *info, unsigned char channel, unsigned char cmd)
699 {
700         wait_command_complete(info, channel);
701         write_reg(info, (unsigned char) (channel + CMDR), cmd);
702 }
703
704 static void tx_pause(struct tty_struct *tty)
705 {
706         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
707         unsigned long flags;
708
709         if (mgslpc_paranoia_check(info, tty->name, "tx_pause"))
710                 return;
711         if (debug_level >= DEBUG_LEVEL_INFO)
712                 printk("tx_pause(%s)\n", info->device_name);
713
714         spin_lock_irqsave(&info->lock, flags);
715         if (info->tx_enabled)
716                 tx_stop(info);
717         spin_unlock_irqrestore(&info->lock, flags);
718 }
719
720 static void tx_release(struct tty_struct *tty)
721 {
722         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
723         unsigned long flags;
724
725         if (mgslpc_paranoia_check(info, tty->name, "tx_release"))
726                 return;
727         if (debug_level >= DEBUG_LEVEL_INFO)
728                 printk("tx_release(%s)\n", info->device_name);
729
730         spin_lock_irqsave(&info->lock, flags);
731         if (!info->tx_enabled)
732                 tx_start(info, tty);
733         spin_unlock_irqrestore(&info->lock, flags);
734 }
735
736 /* Return next bottom half action to perform.
737  * or 0 if nothing to do.
738  */
739 static int bh_action(MGSLPC_INFO *info)
740 {
741         unsigned long flags;
742         int rc = 0;
743
744         spin_lock_irqsave(&info->lock, flags);
745
746         if (info->pending_bh & BH_RECEIVE) {
747                 info->pending_bh &= ~BH_RECEIVE;
748                 rc = BH_RECEIVE;
749         } else if (info->pending_bh & BH_TRANSMIT) {
750                 info->pending_bh &= ~BH_TRANSMIT;
751                 rc = BH_TRANSMIT;
752         } else if (info->pending_bh & BH_STATUS) {
753                 info->pending_bh &= ~BH_STATUS;
754                 rc = BH_STATUS;
755         }
756
757         if (!rc) {
758                 /* Mark BH routine as complete */
759                 info->bh_running = false;
760                 info->bh_requested = false;
761         }
762
763         spin_unlock_irqrestore(&info->lock, flags);
764
765         return rc;
766 }
767
768 static void bh_handler(struct work_struct *work)
769 {
770         MGSLPC_INFO *info = container_of(work, MGSLPC_INFO, task);
771         struct tty_struct *tty;
772         int action;
773
774         if (!info)
775                 return;
776
777         if (debug_level >= DEBUG_LEVEL_BH)
778                 printk("%s(%d):bh_handler(%s) entry\n",
779                         __FILE__,__LINE__,info->device_name);
780
781         info->bh_running = true;
782         tty = tty_port_tty_get(&info->port);
783
784         while((action = bh_action(info)) != 0) {
785
786                 /* Process work item */
787                 if (debug_level >= DEBUG_LEVEL_BH)
788                         printk("%s(%d):bh_handler() work item action=%d\n",
789                                 __FILE__,__LINE__,action);
790
791                 switch (action) {
792
793                 case BH_RECEIVE:
794                         while(rx_get_frame(info, tty));
795                         break;
796                 case BH_TRANSMIT:
797                         bh_transmit(info, tty);
798                         break;
799                 case BH_STATUS:
800                         bh_status(info);
801                         break;
802                 default:
803                         /* unknown work item ID */
804                         printk("Unknown work item ID=%08X!\n", action);
805                         break;
806                 }
807         }
808
809         tty_kref_put(tty);
810         if (debug_level >= DEBUG_LEVEL_BH)
811                 printk("%s(%d):bh_handler(%s) exit\n",
812                         __FILE__,__LINE__,info->device_name);
813 }
814
815 static void bh_transmit(MGSLPC_INFO *info, struct tty_struct *tty)
816 {
817         if (debug_level >= DEBUG_LEVEL_BH)
818                 printk("bh_transmit() entry on %s\n", info->device_name);
819
820         if (tty)
821                 tty_wakeup(tty);
822 }
823
824 static void bh_status(MGSLPC_INFO *info)
825 {
826         info->ri_chkcount = 0;
827         info->dsr_chkcount = 0;
828         info->dcd_chkcount = 0;
829         info->cts_chkcount = 0;
830 }
831
832 /* eom: non-zero = end of frame */
833 static void rx_ready_hdlc(MGSLPC_INFO *info, int eom)
834 {
835         unsigned char data[2];
836         unsigned char fifo_count, read_count, i;
837         RXBUF *buf = (RXBUF*)(info->rx_buf + (info->rx_put * info->rx_buf_size));
838
839         if (debug_level >= DEBUG_LEVEL_ISR)
840                 printk("%s(%d):rx_ready_hdlc(eom=%d)\n", __FILE__, __LINE__, eom);
841
842         if (!info->rx_enabled)
843                 return;
844
845         if (info->rx_frame_count >= info->rx_buf_count) {
846                 /* no more free buffers */
847                 issue_command(info, CHA, CMD_RXRESET);
848                 info->pending_bh |= BH_RECEIVE;
849                 info->rx_overflow = true;
850                 info->icount.buf_overrun++;
851                 return;
852         }
853
854         if (eom) {
855                 /* end of frame, get FIFO count from RBCL register */
856                 fifo_count = (unsigned char)(read_reg(info, CHA+RBCL) & 0x1f);
857                 if (fifo_count == 0)
858                         fifo_count = 32;
859         } else
860                 fifo_count = 32;
861
862         do {
863                 if (fifo_count == 1) {
864                         read_count = 1;
865                         data[0] = read_reg(info, CHA + RXFIFO);
866                 } else {
867                         read_count = 2;
868                         *((unsigned short *) data) = read_reg16(info, CHA + RXFIFO);
869                 }
870                 fifo_count -= read_count;
871                 if (!fifo_count && eom)
872                         buf->status = data[--read_count];
873
874                 for (i = 0; i < read_count; i++) {
875                         if (buf->count >= info->max_frame_size) {
876                                 /* frame too large, reset receiver and reset current buffer */
877                                 issue_command(info, CHA, CMD_RXRESET);
878                                 buf->count = 0;
879                                 return;
880                         }
881                         *(buf->data + buf->count) = data[i];
882                         buf->count++;
883                 }
884         } while (fifo_count);
885
886         if (eom) {
887                 info->pending_bh |= BH_RECEIVE;
888                 info->rx_frame_count++;
889                 info->rx_put++;
890                 if (info->rx_put >= info->rx_buf_count)
891                         info->rx_put = 0;
892         }
893         issue_command(info, CHA, CMD_RXFIFO);
894 }
895
896 static void rx_ready_async(MGSLPC_INFO *info, int tcd, struct tty_struct *tty)
897 {
898         unsigned char data, status, flag;
899         int fifo_count;
900         int work = 0;
901         struct mgsl_icount *icount = &info->icount;
902
903         if (!tty) {
904                 /* tty is not available anymore */
905                 issue_command(info, CHA, CMD_RXRESET);
906                 if (debug_level >= DEBUG_LEVEL_ISR)
907                         printk("%s(%d):rx_ready_async(tty=NULL)\n", __FILE__, __LINE__);
908                 return;
909         }
910
911         if (tcd) {
912                 /* early termination, get FIFO count from RBCL register */
913                 fifo_count = (unsigned char)(read_reg(info, CHA+RBCL) & 0x1f);
914
915                 /* Zero fifo count could mean 0 or 32 bytes available.
916                  * If BIT5 of STAR is set then at least 1 byte is available.
917                  */
918                 if (!fifo_count && (read_reg(info,CHA+STAR) & BIT5))
919                         fifo_count = 32;
920         } else
921                 fifo_count = 32;
922
923         tty_buffer_request_room(tty, fifo_count);
924         /* Flush received async data to receive data buffer. */
925         while (fifo_count) {
926                 data   = read_reg(info, CHA + RXFIFO);
927                 status = read_reg(info, CHA + RXFIFO);
928                 fifo_count -= 2;
929
930                 icount->rx++;
931                 flag = TTY_NORMAL;
932
933                 // if no frameing/crc error then save data
934                 // BIT7:parity error
935                 // BIT6:framing error
936
937                 if (status & (BIT7 + BIT6)) {
938                         if (status & BIT7)
939                                 icount->parity++;
940                         else
941                                 icount->frame++;
942
943                         /* discard char if tty control flags say so */
944                         if (status & info->ignore_status_mask)
945                                 continue;
946
947                         status &= info->read_status_mask;
948
949                         if (status & BIT7)
950                                 flag = TTY_PARITY;
951                         else if (status & BIT6)
952                                 flag = TTY_FRAME;
953                 }
954                 work += tty_insert_flip_char(tty, data, flag);
955         }
956         issue_command(info, CHA, CMD_RXFIFO);
957
958         if (debug_level >= DEBUG_LEVEL_ISR) {
959                 printk("%s(%d):rx_ready_async",
960                         __FILE__,__LINE__);
961                 printk("%s(%d):rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
962                         __FILE__,__LINE__,icount->rx,icount->brk,
963                         icount->parity,icount->frame,icount->overrun);
964         }
965
966         if (work)
967                 tty_flip_buffer_push(tty);
968 }
969
970
971 static void tx_done(MGSLPC_INFO *info, struct tty_struct *tty)
972 {
973         if (!info->tx_active)
974                 return;
975
976         info->tx_active = false;
977         info->tx_aborting = false;
978
979         if (info->params.mode == MGSL_MODE_ASYNC)
980                 return;
981
982         info->tx_count = info->tx_put = info->tx_get = 0;
983         del_timer(&info->tx_timer);
984
985         if (info->drop_rts_on_tx_done) {
986                 get_signals(info);
987                 if (info->serial_signals & SerialSignal_RTS) {
988                         info->serial_signals &= ~SerialSignal_RTS;
989                         set_signals(info);
990                 }
991                 info->drop_rts_on_tx_done = false;
992         }
993
994 #if SYNCLINK_GENERIC_HDLC
995         if (info->netcount)
996                 hdlcdev_tx_done(info);
997         else
998 #endif
999         {
1000                 if (tty && (tty->stopped || tty->hw_stopped)) {
1001                         tx_stop(info);
1002                         return;
1003                 }
1004                 info->pending_bh |= BH_TRANSMIT;
1005         }
1006 }
1007
1008 static void tx_ready(MGSLPC_INFO *info, struct tty_struct *tty)
1009 {
1010         unsigned char fifo_count = 32;
1011         int c;
1012
1013         if (debug_level >= DEBUG_LEVEL_ISR)
1014                 printk("%s(%d):tx_ready(%s)\n", __FILE__, __LINE__, info->device_name);
1015
1016         if (info->params.mode == MGSL_MODE_HDLC) {
1017                 if (!info->tx_active)
1018                         return;
1019         } else {
1020                 if (tty && (tty->stopped || tty->hw_stopped)) {
1021                         tx_stop(info);
1022                         return;
1023                 }
1024                 if (!info->tx_count)
1025                         info->tx_active = false;
1026         }
1027
1028         if (!info->tx_count)
1029                 return;
1030
1031         while (info->tx_count && fifo_count) {
1032                 c = min(2, min_t(int, fifo_count, min(info->tx_count, TXBUFSIZE - info->tx_get)));
1033
1034                 if (c == 1) {
1035                         write_reg(info, CHA + TXFIFO, *(info->tx_buf + info->tx_get));
1036                 } else {
1037                         write_reg16(info, CHA + TXFIFO,
1038                                           *((unsigned short*)(info->tx_buf + info->tx_get)));
1039                 }
1040                 info->tx_count -= c;
1041                 info->tx_get = (info->tx_get + c) & (TXBUFSIZE - 1);
1042                 fifo_count -= c;
1043         }
1044
1045         if (info->params.mode == MGSL_MODE_ASYNC) {
1046                 if (info->tx_count < WAKEUP_CHARS)
1047                         info->pending_bh |= BH_TRANSMIT;
1048                 issue_command(info, CHA, CMD_TXFIFO);
1049         } else {
1050                 if (info->tx_count)
1051                         issue_command(info, CHA, CMD_TXFIFO);
1052                 else
1053                         issue_command(info, CHA, CMD_TXFIFO + CMD_TXEOM);
1054         }
1055 }
1056
1057 static void cts_change(MGSLPC_INFO *info, struct tty_struct *tty)
1058 {
1059         get_signals(info);
1060         if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1061                 irq_disable(info, CHB, IRQ_CTS);
1062         info->icount.cts++;
1063         if (info->serial_signals & SerialSignal_CTS)
1064                 info->input_signal_events.cts_up++;
1065         else
1066                 info->input_signal_events.cts_down++;
1067         wake_up_interruptible(&info->status_event_wait_q);
1068         wake_up_interruptible(&info->event_wait_q);
1069
1070         if (tty && tty_port_cts_enabled(&info->port)) {
1071                 if (tty->hw_stopped) {
1072                         if (info->serial_signals & SerialSignal_CTS) {
1073                                 if (debug_level >= DEBUG_LEVEL_ISR)
1074                                         printk("CTS tx start...");
1075                                 tty->hw_stopped = 0;
1076                                 tx_start(info, tty);
1077                                 info->pending_bh |= BH_TRANSMIT;
1078                                 return;
1079                         }
1080                 } else {
1081                         if (!(info->serial_signals & SerialSignal_CTS)) {
1082                                 if (debug_level >= DEBUG_LEVEL_ISR)
1083                                         printk("CTS tx stop...");
1084                                 tty->hw_stopped = 1;
1085                                 tx_stop(info);
1086                         }
1087                 }
1088         }
1089         info->pending_bh |= BH_STATUS;
1090 }
1091
1092 static void dcd_change(MGSLPC_INFO *info, struct tty_struct *tty)
1093 {
1094         get_signals(info);
1095         if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1096                 irq_disable(info, CHB, IRQ_DCD);
1097         info->icount.dcd++;
1098         if (info->serial_signals & SerialSignal_DCD) {
1099                 info->input_signal_events.dcd_up++;
1100         }
1101         else
1102                 info->input_signal_events.dcd_down++;
1103 #if SYNCLINK_GENERIC_HDLC
1104         if (info->netcount) {
1105                 if (info->serial_signals & SerialSignal_DCD)
1106                         netif_carrier_on(info->netdev);
1107                 else
1108                         netif_carrier_off(info->netdev);
1109         }
1110 #endif
1111         wake_up_interruptible(&info->status_event_wait_q);
1112         wake_up_interruptible(&info->event_wait_q);
1113
1114         if (info->port.flags & ASYNC_CHECK_CD) {
1115                 if (debug_level >= DEBUG_LEVEL_ISR)
1116                         printk("%s CD now %s...", info->device_name,
1117                                (info->serial_signals & SerialSignal_DCD) ? "on" : "off");
1118                 if (info->serial_signals & SerialSignal_DCD)
1119                         wake_up_interruptible(&info->port.open_wait);
1120                 else {
1121                         if (debug_level >= DEBUG_LEVEL_ISR)
1122                                 printk("doing serial hangup...");
1123                         if (tty)
1124                                 tty_hangup(tty);
1125                 }
1126         }
1127         info->pending_bh |= BH_STATUS;
1128 }
1129
1130 static void dsr_change(MGSLPC_INFO *info)
1131 {
1132         get_signals(info);
1133         if ((info->dsr_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1134                 port_irq_disable(info, PVR_DSR);
1135         info->icount.dsr++;
1136         if (info->serial_signals & SerialSignal_DSR)
1137                 info->input_signal_events.dsr_up++;
1138         else
1139                 info->input_signal_events.dsr_down++;
1140         wake_up_interruptible(&info->status_event_wait_q);
1141         wake_up_interruptible(&info->event_wait_q);
1142         info->pending_bh |= BH_STATUS;
1143 }
1144
1145 static void ri_change(MGSLPC_INFO *info)
1146 {
1147         get_signals(info);
1148         if ((info->ri_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1149                 port_irq_disable(info, PVR_RI);
1150         info->icount.rng++;
1151         if (info->serial_signals & SerialSignal_RI)
1152                 info->input_signal_events.ri_up++;
1153         else
1154                 info->input_signal_events.ri_down++;
1155         wake_up_interruptible(&info->status_event_wait_q);
1156         wake_up_interruptible(&info->event_wait_q);
1157         info->pending_bh |= BH_STATUS;
1158 }
1159
1160 /* Interrupt service routine entry point.
1161  *
1162  * Arguments:
1163  *
1164  * irq     interrupt number that caused interrupt
1165  * dev_id  device ID supplied during interrupt registration
1166  */
1167 static irqreturn_t mgslpc_isr(int dummy, void *dev_id)
1168 {
1169         MGSLPC_INFO *info = dev_id;
1170         struct tty_struct *tty;
1171         unsigned short isr;
1172         unsigned char gis, pis;
1173         int count=0;
1174
1175         if (debug_level >= DEBUG_LEVEL_ISR)
1176                 printk("mgslpc_isr(%d) entry.\n", info->irq_level);
1177
1178         if (!(info->p_dev->_locked))
1179                 return IRQ_HANDLED;
1180
1181         tty = tty_port_tty_get(&info->port);
1182
1183         spin_lock(&info->lock);
1184
1185         while ((gis = read_reg(info, CHA + GIS))) {
1186                 if (debug_level >= DEBUG_LEVEL_ISR)
1187                         printk("mgslpc_isr %s gis=%04X\n", info->device_name,gis);
1188
1189                 if ((gis & 0x70) || count > 1000) {
1190                         printk("synclink_cs:hardware failed or ejected\n");
1191                         break;
1192                 }
1193                 count++;
1194
1195                 if (gis & (BIT1 + BIT0)) {
1196                         isr = read_reg16(info, CHB + ISR);
1197                         if (isr & IRQ_DCD)
1198                                 dcd_change(info, tty);
1199                         if (isr & IRQ_CTS)
1200                                 cts_change(info, tty);
1201                 }
1202                 if (gis & (BIT3 + BIT2))
1203                 {
1204                         isr = read_reg16(info, CHA + ISR);
1205                         if (isr & IRQ_TIMER) {
1206                                 info->irq_occurred = true;
1207                                 irq_disable(info, CHA, IRQ_TIMER);
1208                         }
1209
1210                         /* receive IRQs */
1211                         if (isr & IRQ_EXITHUNT) {
1212                                 info->icount.exithunt++;
1213                                 wake_up_interruptible(&info->event_wait_q);
1214                         }
1215                         if (isr & IRQ_BREAK_ON) {
1216                                 info->icount.brk++;
1217                                 if (info->port.flags & ASYNC_SAK)
1218                                         do_SAK(tty);
1219                         }
1220                         if (isr & IRQ_RXTIME) {
1221                                 issue_command(info, CHA, CMD_RXFIFO_READ);
1222                         }
1223                         if (isr & (IRQ_RXEOM + IRQ_RXFIFO)) {
1224                                 if (info->params.mode == MGSL_MODE_HDLC)
1225                                         rx_ready_hdlc(info, isr & IRQ_RXEOM);
1226                                 else
1227                                         rx_ready_async(info, isr & IRQ_RXEOM, tty);
1228                         }
1229
1230                         /* transmit IRQs */
1231                         if (isr & IRQ_UNDERRUN) {
1232                                 if (info->tx_aborting)
1233                                         info->icount.txabort++;
1234                                 else
1235                                         info->icount.txunder++;
1236                                 tx_done(info, tty);
1237                         }
1238                         else if (isr & IRQ_ALLSENT) {
1239                                 info->icount.txok++;
1240                                 tx_done(info, tty);
1241                         }
1242                         else if (isr & IRQ_TXFIFO)
1243                                 tx_ready(info, tty);
1244                 }
1245                 if (gis & BIT7) {
1246                         pis = read_reg(info, CHA + PIS);
1247                         if (pis & BIT1)
1248                                 dsr_change(info);
1249                         if (pis & BIT2)
1250                                 ri_change(info);
1251                 }
1252         }
1253
1254         /* Request bottom half processing if there's something
1255          * for it to do and the bh is not already running
1256          */
1257
1258         if (info->pending_bh && !info->bh_running && !info->bh_requested) {
1259                 if (debug_level >= DEBUG_LEVEL_ISR)
1260                         printk("%s(%d):%s queueing bh task.\n",
1261                                 __FILE__,__LINE__,info->device_name);
1262                 schedule_work(&info->task);
1263                 info->bh_requested = true;
1264         }
1265
1266         spin_unlock(&info->lock);
1267         tty_kref_put(tty);
1268
1269         if (debug_level >= DEBUG_LEVEL_ISR)
1270                 printk("%s(%d):mgslpc_isr(%d)exit.\n",
1271                        __FILE__, __LINE__, info->irq_level);
1272
1273         return IRQ_HANDLED;
1274 }
1275
1276 /* Initialize and start device.
1277  */
1278 static int startup(MGSLPC_INFO * info, struct tty_struct *tty)
1279 {
1280         int retval = 0;
1281
1282         if (debug_level >= DEBUG_LEVEL_INFO)
1283                 printk("%s(%d):startup(%s)\n", __FILE__, __LINE__, info->device_name);
1284
1285         if (info->port.flags & ASYNC_INITIALIZED)
1286                 return 0;
1287
1288         if (!info->tx_buf) {
1289                 /* allocate a page of memory for a transmit buffer */
1290                 info->tx_buf = (unsigned char *)get_zeroed_page(GFP_KERNEL);
1291                 if (!info->tx_buf) {
1292                         printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
1293                                 __FILE__, __LINE__, info->device_name);
1294                         return -ENOMEM;
1295                 }
1296         }
1297
1298         info->pending_bh = 0;
1299
1300         memset(&info->icount, 0, sizeof(info->icount));
1301
1302         setup_timer(&info->tx_timer, tx_timeout, (unsigned long)info);
1303
1304         /* Allocate and claim adapter resources */
1305         retval = claim_resources(info);
1306
1307         /* perform existence check and diagnostics */
1308         if (!retval)
1309                 retval = adapter_test(info);
1310
1311         if (retval) {
1312                 if (capable(CAP_SYS_ADMIN) && tty)
1313                         set_bit(TTY_IO_ERROR, &tty->flags);
1314                 release_resources(info);
1315                 return retval;
1316         }
1317
1318         /* program hardware for current parameters */
1319         mgslpc_change_params(info, tty);
1320
1321         if (tty)
1322                 clear_bit(TTY_IO_ERROR, &tty->flags);
1323
1324         info->port.flags |= ASYNC_INITIALIZED;
1325
1326         return 0;
1327 }
1328
1329 /* Called by mgslpc_close() and mgslpc_hangup() to shutdown hardware
1330  */
1331 static void shutdown(MGSLPC_INFO * info, struct tty_struct *tty)
1332 {
1333         unsigned long flags;
1334
1335         if (!(info->port.flags & ASYNC_INITIALIZED))
1336                 return;
1337
1338         if (debug_level >= DEBUG_LEVEL_INFO)
1339                 printk("%s(%d):mgslpc_shutdown(%s)\n",
1340                          __FILE__, __LINE__, info->device_name);
1341
1342         /* clear status wait queue because status changes */
1343         /* can't happen after shutting down the hardware */
1344         wake_up_interruptible(&info->status_event_wait_q);
1345         wake_up_interruptible(&info->event_wait_q);
1346
1347         del_timer_sync(&info->tx_timer);
1348
1349         if (info->tx_buf) {
1350                 free_page((unsigned long) info->tx_buf);
1351                 info->tx_buf = NULL;
1352         }
1353
1354         spin_lock_irqsave(&info->lock, flags);
1355
1356         rx_stop(info);
1357         tx_stop(info);
1358
1359         /* TODO:disable interrupts instead of reset to preserve signal states */
1360         reset_device(info);
1361
1362         if (!tty || tty->termios.c_cflag & HUPCL) {
1363                 info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
1364                 set_signals(info);
1365         }
1366
1367         spin_unlock_irqrestore(&info->lock, flags);
1368
1369         release_resources(info);
1370
1371         if (tty)
1372                 set_bit(TTY_IO_ERROR, &tty->flags);
1373
1374         info->port.flags &= ~ASYNC_INITIALIZED;
1375 }
1376
1377 static void mgslpc_program_hw(MGSLPC_INFO *info, struct tty_struct *tty)
1378 {
1379         unsigned long flags;
1380
1381         spin_lock_irqsave(&info->lock, flags);
1382
1383         rx_stop(info);
1384         tx_stop(info);
1385         info->tx_count = info->tx_put = info->tx_get = 0;
1386
1387         if (info->params.mode == MGSL_MODE_HDLC || info->netcount)
1388                 hdlc_mode(info);
1389         else
1390                 async_mode(info);
1391
1392         set_signals(info);
1393
1394         info->dcd_chkcount = 0;
1395         info->cts_chkcount = 0;
1396         info->ri_chkcount = 0;
1397         info->dsr_chkcount = 0;
1398
1399         irq_enable(info, CHB, IRQ_DCD | IRQ_CTS);
1400         port_irq_enable(info, (unsigned char) PVR_DSR | PVR_RI);
1401         get_signals(info);
1402
1403         if (info->netcount || (tty && (tty->termios.c_cflag & CREAD)))
1404                 rx_start(info);
1405
1406         spin_unlock_irqrestore(&info->lock, flags);
1407 }
1408
1409 /* Reconfigure adapter based on new parameters
1410  */
1411 static void mgslpc_change_params(MGSLPC_INFO *info, struct tty_struct *tty)
1412 {
1413         unsigned cflag;
1414         int bits_per_char;
1415
1416         if (!tty)
1417                 return;
1418
1419         if (debug_level >= DEBUG_LEVEL_INFO)
1420                 printk("%s(%d):mgslpc_change_params(%s)\n",
1421                          __FILE__, __LINE__, info->device_name);
1422
1423         cflag = tty->termios.c_cflag;
1424
1425         /* if B0 rate (hangup) specified then negate DTR and RTS */
1426         /* otherwise assert DTR and RTS */
1427         if (cflag & CBAUD)
1428                 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
1429         else
1430                 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
1431
1432         /* byte size and parity */
1433
1434         switch (cflag & CSIZE) {
1435         case CS5: info->params.data_bits = 5; break;
1436         case CS6: info->params.data_bits = 6; break;
1437         case CS7: info->params.data_bits = 7; break;
1438         case CS8: info->params.data_bits = 8; break;
1439         default:  info->params.data_bits = 7; break;
1440         }
1441
1442         if (cflag & CSTOPB)
1443                 info->params.stop_bits = 2;
1444         else
1445                 info->params.stop_bits = 1;
1446
1447         info->params.parity = ASYNC_PARITY_NONE;
1448         if (cflag & PARENB) {
1449                 if (cflag & PARODD)
1450                         info->params.parity = ASYNC_PARITY_ODD;
1451                 else
1452                         info->params.parity = ASYNC_PARITY_EVEN;
1453 #ifdef CMSPAR
1454                 if (cflag & CMSPAR)
1455                         info->params.parity = ASYNC_PARITY_SPACE;
1456 #endif
1457         }
1458
1459         /* calculate number of jiffies to transmit a full
1460          * FIFO (32 bytes) at specified data rate
1461          */
1462         bits_per_char = info->params.data_bits +
1463                         info->params.stop_bits + 1;
1464
1465         /* if port data rate is set to 460800 or less then
1466          * allow tty settings to override, otherwise keep the
1467          * current data rate.
1468          */
1469         if (info->params.data_rate <= 460800) {
1470                 info->params.data_rate = tty_get_baud_rate(tty);
1471         }
1472
1473         if (info->params.data_rate) {
1474                 info->timeout = (32*HZ*bits_per_char) /
1475                                 info->params.data_rate;
1476         }
1477         info->timeout += HZ/50;         /* Add .02 seconds of slop */
1478
1479         if (cflag & CRTSCTS)
1480                 info->port.flags |= ASYNC_CTS_FLOW;
1481         else
1482                 info->port.flags &= ~ASYNC_CTS_FLOW;
1483
1484         if (cflag & CLOCAL)
1485                 info->port.flags &= ~ASYNC_CHECK_CD;
1486         else
1487                 info->port.flags |= ASYNC_CHECK_CD;
1488
1489         /* process tty input control flags */
1490
1491         info->read_status_mask = 0;
1492         if (I_INPCK(tty))
1493                 info->read_status_mask |= BIT7 | BIT6;
1494         if (I_IGNPAR(tty))
1495                 info->ignore_status_mask |= BIT7 | BIT6;
1496
1497         mgslpc_program_hw(info, tty);
1498 }
1499
1500 /* Add a character to the transmit buffer
1501  */
1502 static int mgslpc_put_char(struct tty_struct *tty, unsigned char ch)
1503 {
1504         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1505         unsigned long flags;
1506
1507         if (debug_level >= DEBUG_LEVEL_INFO) {
1508                 printk("%s(%d):mgslpc_put_char(%d) on %s\n",
1509                         __FILE__, __LINE__, ch, info->device_name);
1510         }
1511
1512         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_put_char"))
1513                 return 0;
1514
1515         if (!info->tx_buf)
1516                 return 0;
1517
1518         spin_lock_irqsave(&info->lock, flags);
1519
1520         if (info->params.mode == MGSL_MODE_ASYNC || !info->tx_active) {
1521                 if (info->tx_count < TXBUFSIZE - 1) {
1522                         info->tx_buf[info->tx_put++] = ch;
1523                         info->tx_put &= TXBUFSIZE-1;
1524                         info->tx_count++;
1525                 }
1526         }
1527
1528         spin_unlock_irqrestore(&info->lock, flags);
1529         return 1;
1530 }
1531
1532 /* Enable transmitter so remaining characters in the
1533  * transmit buffer are sent.
1534  */
1535 static void mgslpc_flush_chars(struct tty_struct *tty)
1536 {
1537         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1538         unsigned long flags;
1539
1540         if (debug_level >= DEBUG_LEVEL_INFO)
1541                 printk("%s(%d):mgslpc_flush_chars() entry on %s tx_count=%d\n",
1542                         __FILE__, __LINE__, info->device_name, info->tx_count);
1543
1544         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_flush_chars"))
1545                 return;
1546
1547         if (info->tx_count <= 0 || tty->stopped ||
1548             tty->hw_stopped || !info->tx_buf)
1549                 return;
1550
1551         if (debug_level >= DEBUG_LEVEL_INFO)
1552                 printk("%s(%d):mgslpc_flush_chars() entry on %s starting transmitter\n",
1553                         __FILE__, __LINE__, info->device_name);
1554
1555         spin_lock_irqsave(&info->lock, flags);
1556         if (!info->tx_active)
1557                 tx_start(info, tty);
1558         spin_unlock_irqrestore(&info->lock, flags);
1559 }
1560
1561 /* Send a block of data
1562  *
1563  * Arguments:
1564  *
1565  * tty        pointer to tty information structure
1566  * buf        pointer to buffer containing send data
1567  * count      size of send data in bytes
1568  *
1569  * Returns: number of characters written
1570  */
1571 static int mgslpc_write(struct tty_struct * tty,
1572                         const unsigned char *buf, int count)
1573 {
1574         int c, ret = 0;
1575         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1576         unsigned long flags;
1577
1578         if (debug_level >= DEBUG_LEVEL_INFO)
1579                 printk("%s(%d):mgslpc_write(%s) count=%d\n",
1580                         __FILE__, __LINE__, info->device_name, count);
1581
1582         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_write") ||
1583                 !info->tx_buf)
1584                 goto cleanup;
1585
1586         if (info->params.mode == MGSL_MODE_HDLC) {
1587                 if (count > TXBUFSIZE) {
1588                         ret = -EIO;
1589                         goto cleanup;
1590                 }
1591                 if (info->tx_active)
1592                         goto cleanup;
1593                 else if (info->tx_count)
1594                         goto start;
1595         }
1596
1597         for (;;) {
1598                 c = min(count,
1599                         min(TXBUFSIZE - info->tx_count - 1,
1600                             TXBUFSIZE - info->tx_put));
1601                 if (c <= 0)
1602                         break;
1603
1604                 memcpy(info->tx_buf + info->tx_put, buf, c);
1605
1606                 spin_lock_irqsave(&info->lock, flags);
1607                 info->tx_put = (info->tx_put + c) & (TXBUFSIZE-1);
1608                 info->tx_count += c;
1609                 spin_unlock_irqrestore(&info->lock, flags);
1610
1611                 buf += c;
1612                 count -= c;
1613                 ret += c;
1614         }
1615 start:
1616         if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
1617                 spin_lock_irqsave(&info->lock, flags);
1618                 if (!info->tx_active)
1619                         tx_start(info, tty);
1620                 spin_unlock_irqrestore(&info->lock, flags);
1621         }
1622 cleanup:
1623         if (debug_level >= DEBUG_LEVEL_INFO)
1624                 printk("%s(%d):mgslpc_write(%s) returning=%d\n",
1625                         __FILE__, __LINE__, info->device_name, ret);
1626         return ret;
1627 }
1628
1629 /* Return the count of free bytes in transmit buffer
1630  */
1631 static int mgslpc_write_room(struct tty_struct *tty)
1632 {
1633         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1634         int ret;
1635
1636         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_write_room"))
1637                 return 0;
1638
1639         if (info->params.mode == MGSL_MODE_HDLC) {
1640                 /* HDLC (frame oriented) mode */
1641                 if (info->tx_active)
1642                         return 0;
1643                 else
1644                         return HDLC_MAX_FRAME_SIZE;
1645         } else {
1646                 ret = TXBUFSIZE - info->tx_count - 1;
1647                 if (ret < 0)
1648                         ret = 0;
1649         }
1650
1651         if (debug_level >= DEBUG_LEVEL_INFO)
1652                 printk("%s(%d):mgslpc_write_room(%s)=%d\n",
1653                          __FILE__, __LINE__, info->device_name, ret);
1654         return ret;
1655 }
1656
1657 /* Return the count of bytes in transmit buffer
1658  */
1659 static int mgslpc_chars_in_buffer(struct tty_struct *tty)
1660 {
1661         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1662         int rc;
1663
1664         if (debug_level >= DEBUG_LEVEL_INFO)
1665                 printk("%s(%d):mgslpc_chars_in_buffer(%s)\n",
1666                          __FILE__, __LINE__, info->device_name);
1667
1668         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_chars_in_buffer"))
1669                 return 0;
1670
1671         if (info->params.mode == MGSL_MODE_HDLC)
1672                 rc = info->tx_active ? info->max_frame_size : 0;
1673         else
1674                 rc = info->tx_count;
1675
1676         if (debug_level >= DEBUG_LEVEL_INFO)
1677                 printk("%s(%d):mgslpc_chars_in_buffer(%s)=%d\n",
1678                          __FILE__, __LINE__, info->device_name, rc);
1679
1680         return rc;
1681 }
1682
1683 /* Discard all data in the send buffer
1684  */
1685 static void mgslpc_flush_buffer(struct tty_struct *tty)
1686 {
1687         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1688         unsigned long flags;
1689
1690         if (debug_level >= DEBUG_LEVEL_INFO)
1691                 printk("%s(%d):mgslpc_flush_buffer(%s) entry\n",
1692                          __FILE__, __LINE__, info->device_name);
1693
1694         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_flush_buffer"))
1695                 return;
1696
1697         spin_lock_irqsave(&info->lock, flags);
1698         info->tx_count = info->tx_put = info->tx_get = 0;
1699         del_timer(&info->tx_timer);
1700         spin_unlock_irqrestore(&info->lock, flags);
1701
1702         wake_up_interruptible(&tty->write_wait);
1703         tty_wakeup(tty);
1704 }
1705
1706 /* Send a high-priority XON/XOFF character
1707  */
1708 static void mgslpc_send_xchar(struct tty_struct *tty, char ch)
1709 {
1710         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1711         unsigned long flags;
1712
1713         if (debug_level >= DEBUG_LEVEL_INFO)
1714                 printk("%s(%d):mgslpc_send_xchar(%s,%d)\n",
1715                          __FILE__, __LINE__, info->device_name, ch);
1716
1717         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_send_xchar"))
1718                 return;
1719
1720         info->x_char = ch;
1721         if (ch) {
1722                 spin_lock_irqsave(&info->lock, flags);
1723                 if (!info->tx_enabled)
1724                         tx_start(info, tty);
1725                 spin_unlock_irqrestore(&info->lock, flags);
1726         }
1727 }
1728
1729 /* Signal remote device to throttle send data (our receive data)
1730  */
1731 static void mgslpc_throttle(struct tty_struct * tty)
1732 {
1733         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1734         unsigned long flags;
1735
1736         if (debug_level >= DEBUG_LEVEL_INFO)
1737                 printk("%s(%d):mgslpc_throttle(%s) entry\n",
1738                          __FILE__, __LINE__, info->device_name);
1739
1740         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_throttle"))
1741                 return;
1742
1743         if (I_IXOFF(tty))
1744                 mgslpc_send_xchar(tty, STOP_CHAR(tty));
1745
1746         if (tty->termios.c_cflag & CRTSCTS) {
1747                 spin_lock_irqsave(&info->lock, flags);
1748                 info->serial_signals &= ~SerialSignal_RTS;
1749                 set_signals(info);
1750                 spin_unlock_irqrestore(&info->lock, flags);
1751         }
1752 }
1753
1754 /* Signal remote device to stop throttling send data (our receive data)
1755  */
1756 static void mgslpc_unthrottle(struct tty_struct * tty)
1757 {
1758         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1759         unsigned long flags;
1760
1761         if (debug_level >= DEBUG_LEVEL_INFO)
1762                 printk("%s(%d):mgslpc_unthrottle(%s) entry\n",
1763                          __FILE__, __LINE__, info->device_name);
1764
1765         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_unthrottle"))
1766                 return;
1767
1768         if (I_IXOFF(tty)) {
1769                 if (info->x_char)
1770                         info->x_char = 0;
1771                 else
1772                         mgslpc_send_xchar(tty, START_CHAR(tty));
1773         }
1774
1775         if (tty->termios.c_cflag & CRTSCTS) {
1776                 spin_lock_irqsave(&info->lock, flags);
1777                 info->serial_signals |= SerialSignal_RTS;
1778                 set_signals(info);
1779                 spin_unlock_irqrestore(&info->lock, flags);
1780         }
1781 }
1782
1783 /* get the current serial statistics
1784  */
1785 static int get_stats(MGSLPC_INFO * info, struct mgsl_icount __user *user_icount)
1786 {
1787         int err;
1788         if (debug_level >= DEBUG_LEVEL_INFO)
1789                 printk("get_params(%s)\n", info->device_name);
1790         if (!user_icount) {
1791                 memset(&info->icount, 0, sizeof(info->icount));
1792         } else {
1793                 COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
1794                 if (err)
1795                         return -EFAULT;
1796         }
1797         return 0;
1798 }
1799
1800 /* get the current serial parameters
1801  */
1802 static int get_params(MGSLPC_INFO * info, MGSL_PARAMS __user *user_params)
1803 {
1804         int err;
1805         if (debug_level >= DEBUG_LEVEL_INFO)
1806                 printk("get_params(%s)\n", info->device_name);
1807         COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
1808         if (err)
1809                 return -EFAULT;
1810         return 0;
1811 }
1812
1813 /* set the serial parameters
1814  *
1815  * Arguments:
1816  *
1817  *      info            pointer to device instance data
1818  *      new_params      user buffer containing new serial params
1819  *
1820  * Returns:     0 if success, otherwise error code
1821  */
1822 static int set_params(MGSLPC_INFO * info, MGSL_PARAMS __user *new_params, struct tty_struct *tty)
1823 {
1824         unsigned long flags;
1825         MGSL_PARAMS tmp_params;
1826         int err;
1827
1828         if (debug_level >= DEBUG_LEVEL_INFO)
1829                 printk("%s(%d):set_params %s\n", __FILE__,__LINE__,
1830                         info->device_name);
1831         COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
1832         if (err) {
1833                 if (debug_level >= DEBUG_LEVEL_INFO)
1834                         printk("%s(%d):set_params(%s) user buffer copy failed\n",
1835                                 __FILE__, __LINE__, info->device_name);
1836                 return -EFAULT;
1837         }
1838
1839         spin_lock_irqsave(&info->lock, flags);
1840         memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
1841         spin_unlock_irqrestore(&info->lock, flags);
1842
1843         mgslpc_change_params(info, tty);
1844
1845         return 0;
1846 }
1847
1848 static int get_txidle(MGSLPC_INFO * info, int __user *idle_mode)
1849 {
1850         int err;
1851         if (debug_level >= DEBUG_LEVEL_INFO)
1852                 printk("get_txidle(%s)=%d\n", info->device_name, info->idle_mode);
1853         COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
1854         if (err)
1855                 return -EFAULT;
1856         return 0;
1857 }
1858
1859 static int set_txidle(MGSLPC_INFO * info, int idle_mode)
1860 {
1861         unsigned long flags;
1862         if (debug_level >= DEBUG_LEVEL_INFO)
1863                 printk("set_txidle(%s,%d)\n", info->device_name, idle_mode);
1864         spin_lock_irqsave(&info->lock, flags);
1865         info->idle_mode = idle_mode;
1866         tx_set_idle(info);
1867         spin_unlock_irqrestore(&info->lock, flags);
1868         return 0;
1869 }
1870
1871 static int get_interface(MGSLPC_INFO * info, int __user *if_mode)
1872 {
1873         int err;
1874         if (debug_level >= DEBUG_LEVEL_INFO)
1875                 printk("get_interface(%s)=%d\n", info->device_name, info->if_mode);
1876         COPY_TO_USER(err,if_mode, &info->if_mode, sizeof(int));
1877         if (err)
1878                 return -EFAULT;
1879         return 0;
1880 }
1881
1882 static int set_interface(MGSLPC_INFO * info, int if_mode)
1883 {
1884         unsigned long flags;
1885         unsigned char val;
1886         if (debug_level >= DEBUG_LEVEL_INFO)
1887                 printk("set_interface(%s,%d)\n", info->device_name, if_mode);
1888         spin_lock_irqsave(&info->lock, flags);
1889         info->if_mode = if_mode;
1890
1891         val = read_reg(info, PVR) & 0x0f;
1892         switch (info->if_mode)
1893         {
1894         case MGSL_INTERFACE_RS232: val |= PVR_RS232; break;
1895         case MGSL_INTERFACE_V35:   val |= PVR_V35;   break;
1896         case MGSL_INTERFACE_RS422: val |= PVR_RS422; break;
1897         }
1898         write_reg(info, PVR, val);
1899
1900         spin_unlock_irqrestore(&info->lock, flags);
1901         return 0;
1902 }
1903
1904 static int set_txenable(MGSLPC_INFO * info, int enable, struct tty_struct *tty)
1905 {
1906         unsigned long flags;
1907
1908         if (debug_level >= DEBUG_LEVEL_INFO)
1909                 printk("set_txenable(%s,%d)\n", info->device_name, enable);
1910
1911         spin_lock_irqsave(&info->lock, flags);
1912         if (enable) {
1913                 if (!info->tx_enabled)
1914                         tx_start(info, tty);
1915         } else {
1916                 if (info->tx_enabled)
1917                         tx_stop(info);
1918         }
1919         spin_unlock_irqrestore(&info->lock, flags);
1920         return 0;
1921 }
1922
1923 static int tx_abort(MGSLPC_INFO * info)
1924 {
1925         unsigned long flags;
1926
1927         if (debug_level >= DEBUG_LEVEL_INFO)
1928                 printk("tx_abort(%s)\n", info->device_name);
1929
1930         spin_lock_irqsave(&info->lock, flags);
1931         if (info->tx_active && info->tx_count &&
1932             info->params.mode == MGSL_MODE_HDLC) {
1933                 /* clear data count so FIFO is not filled on next IRQ.
1934                  * This results in underrun and abort transmission.
1935                  */
1936                 info->tx_count = info->tx_put = info->tx_get = 0;
1937                 info->tx_aborting = true;
1938         }
1939         spin_unlock_irqrestore(&info->lock, flags);
1940         return 0;
1941 }
1942
1943 static int set_rxenable(MGSLPC_INFO * info, int enable)
1944 {
1945         unsigned long flags;
1946
1947         if (debug_level >= DEBUG_LEVEL_INFO)
1948                 printk("set_rxenable(%s,%d)\n", info->device_name, enable);
1949
1950         spin_lock_irqsave(&info->lock, flags);
1951         if (enable) {
1952                 if (!info->rx_enabled)
1953                         rx_start(info);
1954         } else {
1955                 if (info->rx_enabled)
1956                         rx_stop(info);
1957         }
1958         spin_unlock_irqrestore(&info->lock, flags);
1959         return 0;
1960 }
1961
1962 /* wait for specified event to occur
1963  *
1964  * Arguments:           info    pointer to device instance data
1965  *                      mask    pointer to bitmask of events to wait for
1966  * Return Value:        0       if successful and bit mask updated with
1967  *                              of events triggerred,
1968  *                      otherwise error code
1969  */
1970 static int wait_events(MGSLPC_INFO * info, int __user *mask_ptr)
1971 {
1972         unsigned long flags;
1973         int s;
1974         int rc=0;
1975         struct mgsl_icount cprev, cnow;
1976         int events;
1977         int mask;
1978         struct  _input_signal_events oldsigs, newsigs;
1979         DECLARE_WAITQUEUE(wait, current);
1980
1981         COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
1982         if (rc)
1983                 return  -EFAULT;
1984
1985         if (debug_level >= DEBUG_LEVEL_INFO)
1986                 printk("wait_events(%s,%d)\n", info->device_name, mask);
1987
1988         spin_lock_irqsave(&info->lock, flags);
1989
1990         /* return immediately if state matches requested events */
1991         get_signals(info);
1992         s = info->serial_signals;
1993         events = mask &
1994                 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
1995                   ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
1996                   ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
1997                   ((s & SerialSignal_RI)  ? MgslEvent_RiActive :MgslEvent_RiInactive) );
1998         if (events) {
1999                 spin_unlock_irqrestore(&info->lock, flags);
2000                 goto exit;
2001         }
2002
2003         /* save current irq counts */
2004         cprev = info->icount;
2005         oldsigs = info->input_signal_events;
2006
2007         if ((info->params.mode == MGSL_MODE_HDLC) &&
2008             (mask & MgslEvent_ExitHuntMode))
2009                 irq_enable(info, CHA, IRQ_EXITHUNT);
2010
2011         set_current_state(TASK_INTERRUPTIBLE);
2012         add_wait_queue(&info->event_wait_q, &wait);
2013
2014         spin_unlock_irqrestore(&info->lock, flags);
2015
2016
2017         for(;;) {
2018                 schedule();
2019                 if (signal_pending(current)) {
2020                         rc = -ERESTARTSYS;
2021                         break;
2022                 }
2023
2024                 /* get current irq counts */
2025                 spin_lock_irqsave(&info->lock, flags);
2026                 cnow = info->icount;
2027                 newsigs = info->input_signal_events;
2028                 set_current_state(TASK_INTERRUPTIBLE);
2029                 spin_unlock_irqrestore(&info->lock, flags);
2030
2031                 /* if no change, wait aborted for some reason */
2032                 if (newsigs.dsr_up   == oldsigs.dsr_up   &&
2033                     newsigs.dsr_down == oldsigs.dsr_down &&
2034                     newsigs.dcd_up   == oldsigs.dcd_up   &&
2035                     newsigs.dcd_down == oldsigs.dcd_down &&
2036                     newsigs.cts_up   == oldsigs.cts_up   &&
2037                     newsigs.cts_down == oldsigs.cts_down &&
2038                     newsigs.ri_up    == oldsigs.ri_up    &&
2039                     newsigs.ri_down  == oldsigs.ri_down  &&
2040                     cnow.exithunt    == cprev.exithunt   &&
2041                     cnow.rxidle      == cprev.rxidle) {
2042                         rc = -EIO;
2043                         break;
2044                 }
2045
2046                 events = mask &
2047                         ( (newsigs.dsr_up   != oldsigs.dsr_up   ? MgslEvent_DsrActive:0)   +
2048                           (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
2049                           (newsigs.dcd_up   != oldsigs.dcd_up   ? MgslEvent_DcdActive:0)   +
2050                           (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
2051                           (newsigs.cts_up   != oldsigs.cts_up   ? MgslEvent_CtsActive:0)   +
2052                           (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
2053                           (newsigs.ri_up    != oldsigs.ri_up    ? MgslEvent_RiActive:0)    +
2054                           (newsigs.ri_down  != oldsigs.ri_down  ? MgslEvent_RiInactive:0)  +
2055                           (cnow.exithunt    != cprev.exithunt   ? MgslEvent_ExitHuntMode:0) +
2056                           (cnow.rxidle      != cprev.rxidle     ? MgslEvent_IdleReceived:0) );
2057                 if (events)
2058                         break;
2059
2060                 cprev = cnow;
2061                 oldsigs = newsigs;
2062         }
2063
2064         remove_wait_queue(&info->event_wait_q, &wait);
2065         set_current_state(TASK_RUNNING);
2066
2067         if (mask & MgslEvent_ExitHuntMode) {
2068                 spin_lock_irqsave(&info->lock, flags);
2069                 if (!waitqueue_active(&info->event_wait_q))
2070                         irq_disable(info, CHA, IRQ_EXITHUNT);
2071                 spin_unlock_irqrestore(&info->lock, flags);
2072         }
2073 exit:
2074         if (rc == 0)
2075                 PUT_USER(rc, events, mask_ptr);
2076         return rc;
2077 }
2078
2079 static int modem_input_wait(MGSLPC_INFO *info,int arg)
2080 {
2081         unsigned long flags;
2082         int rc;
2083         struct mgsl_icount cprev, cnow;
2084         DECLARE_WAITQUEUE(wait, current);
2085
2086         /* save current irq counts */
2087         spin_lock_irqsave(&info->lock, flags);
2088         cprev = info->icount;
2089         add_wait_queue(&info->status_event_wait_q, &wait);
2090         set_current_state(TASK_INTERRUPTIBLE);
2091         spin_unlock_irqrestore(&info->lock, flags);
2092
2093         for(;;) {
2094                 schedule();
2095                 if (signal_pending(current)) {
2096                         rc = -ERESTARTSYS;
2097                         break;
2098                 }
2099
2100                 /* get new irq counts */
2101                 spin_lock_irqsave(&info->lock, flags);
2102                 cnow = info->icount;
2103                 set_current_state(TASK_INTERRUPTIBLE);
2104                 spin_unlock_irqrestore(&info->lock, flags);
2105
2106                 /* if no change, wait aborted for some reason */
2107                 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2108                     cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
2109                         rc = -EIO;
2110                         break;
2111                 }
2112
2113                 /* check for change in caller specified modem input */
2114                 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
2115                     (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
2116                     (arg & TIOCM_CD  && cnow.dcd != cprev.dcd) ||
2117                     (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
2118                         rc = 0;
2119                         break;
2120                 }
2121
2122                 cprev = cnow;
2123         }
2124         remove_wait_queue(&info->status_event_wait_q, &wait);
2125         set_current_state(TASK_RUNNING);
2126         return rc;
2127 }
2128
2129 /* return the state of the serial control and status signals
2130  */
2131 static int tiocmget(struct tty_struct *tty)
2132 {
2133         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
2134         unsigned int result;
2135         unsigned long flags;
2136
2137         spin_lock_irqsave(&info->lock, flags);
2138         get_signals(info);
2139         spin_unlock_irqrestore(&info->lock, flags);
2140
2141         result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
2142                 ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
2143                 ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
2144                 ((info->serial_signals & SerialSignal_RI)  ? TIOCM_RNG:0) +
2145                 ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
2146                 ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS:0);
2147
2148         if (debug_level >= DEBUG_LEVEL_INFO)
2149                 printk("%s(%d):%s tiocmget() value=%08X\n",
2150                          __FILE__, __LINE__, info->device_name, result);
2151         return result;
2152 }
2153
2154 /* set modem control signals (DTR/RTS)
2155  */
2156 static int tiocmset(struct tty_struct *tty,
2157                     unsigned int set, unsigned int clear)
2158 {
2159         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
2160         unsigned long flags;
2161
2162         if (debug_level >= DEBUG_LEVEL_INFO)
2163                 printk("%s(%d):%s tiocmset(%x,%x)\n",
2164                         __FILE__, __LINE__, info->device_name, set, clear);
2165
2166         if (set & TIOCM_RTS)
2167                 info->serial_signals |= SerialSignal_RTS;
2168         if (set & TIOCM_DTR)
2169                 info->serial_signals |= SerialSignal_DTR;
2170         if (clear & TIOCM_RTS)
2171                 info->serial_signals &= ~SerialSignal_RTS;
2172         if (clear & TIOCM_DTR)
2173                 info->serial_signals &= ~SerialSignal_DTR;
2174
2175         spin_lock_irqsave(&info->lock, flags);
2176         set_signals(info);
2177         spin_unlock_irqrestore(&info->lock, flags);
2178
2179         return 0;
2180 }
2181
2182 /* Set or clear transmit break condition
2183  *
2184  * Arguments:           tty             pointer to tty instance data
2185  *                      break_state     -1=set break condition, 0=clear
2186  */
2187 static int mgslpc_break(struct tty_struct *tty, int break_state)
2188 {
2189         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2190         unsigned long flags;
2191
2192         if (debug_level >= DEBUG_LEVEL_INFO)
2193                 printk("%s(%d):mgslpc_break(%s,%d)\n",
2194                          __FILE__, __LINE__, info->device_name, break_state);
2195
2196         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_break"))
2197                 return -EINVAL;
2198
2199         spin_lock_irqsave(&info->lock, flags);
2200         if (break_state == -1)
2201                 set_reg_bits(info, CHA+DAFO, BIT6);
2202         else
2203                 clear_reg_bits(info, CHA+DAFO, BIT6);
2204         spin_unlock_irqrestore(&info->lock, flags);
2205         return 0;
2206 }
2207
2208 static int mgslpc_get_icount(struct tty_struct *tty,
2209                                 struct serial_icounter_struct *icount)
2210 {
2211         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2212         struct mgsl_icount cnow;        /* kernel counter temps */
2213         unsigned long flags;
2214
2215         spin_lock_irqsave(&info->lock, flags);
2216         cnow = info->icount;
2217         spin_unlock_irqrestore(&info->lock, flags);
2218
2219         icount->cts = cnow.cts;
2220         icount->dsr = cnow.dsr;
2221         icount->rng = cnow.rng;
2222         icount->dcd = cnow.dcd;
2223         icount->rx = cnow.rx;
2224         icount->tx = cnow.tx;
2225         icount->frame = cnow.frame;
2226         icount->overrun = cnow.overrun;
2227         icount->parity = cnow.parity;
2228         icount->brk = cnow.brk;
2229         icount->buf_overrun = cnow.buf_overrun;
2230
2231         return 0;
2232 }
2233
2234 /* Service an IOCTL request
2235  *
2236  * Arguments:
2237  *
2238  *      tty     pointer to tty instance data
2239  *      cmd     IOCTL command code
2240  *      arg     command argument/context
2241  *
2242  * Return Value:        0 if success, otherwise error code
2243  */
2244 static int mgslpc_ioctl(struct tty_struct *tty,
2245                         unsigned int cmd, unsigned long arg)
2246 {
2247         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2248         void __user *argp = (void __user *)arg;
2249
2250         if (debug_level >= DEBUG_LEVEL_INFO)
2251                 printk("%s(%d):mgslpc_ioctl %s cmd=%08X\n", __FILE__, __LINE__,
2252                         info->device_name, cmd);
2253
2254         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_ioctl"))
2255                 return -ENODEV;
2256
2257         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
2258             (cmd != TIOCMIWAIT)) {
2259                 if (tty->flags & (1 << TTY_IO_ERROR))
2260                     return -EIO;
2261         }
2262
2263         switch (cmd) {
2264         case MGSL_IOCGPARAMS:
2265                 return get_params(info, argp);
2266         case MGSL_IOCSPARAMS:
2267                 return set_params(info, argp, tty);
2268         case MGSL_IOCGTXIDLE:
2269                 return get_txidle(info, argp);
2270         case MGSL_IOCSTXIDLE:
2271                 return set_txidle(info, (int)arg);
2272         case MGSL_IOCGIF:
2273                 return get_interface(info, argp);
2274         case MGSL_IOCSIF:
2275                 return set_interface(info,(int)arg);
2276         case MGSL_IOCTXENABLE:
2277                 return set_txenable(info,(int)arg, tty);
2278         case MGSL_IOCRXENABLE:
2279                 return set_rxenable(info,(int)arg);
2280         case MGSL_IOCTXABORT:
2281                 return tx_abort(info);
2282         case MGSL_IOCGSTATS:
2283                 return get_stats(info, argp);
2284         case MGSL_IOCWAITEVENT:
2285                 return wait_events(info, argp);
2286         case TIOCMIWAIT:
2287                 return modem_input_wait(info,(int)arg);
2288         default:
2289                 return -ENOIOCTLCMD;
2290         }
2291         return 0;
2292 }
2293
2294 /* Set new termios settings
2295  *
2296  * Arguments:
2297  *
2298  *      tty             pointer to tty structure
2299  *      termios         pointer to buffer to hold returned old termios
2300  */
2301 static void mgslpc_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
2302 {
2303         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
2304         unsigned long flags;
2305
2306         if (debug_level >= DEBUG_LEVEL_INFO)
2307                 printk("%s(%d):mgslpc_set_termios %s\n", __FILE__, __LINE__,
2308                         tty->driver->name);
2309
2310         /* just return if nothing has changed */
2311         if ((tty->termios.c_cflag == old_termios->c_cflag)
2312             && (RELEVANT_IFLAG(tty->termios.c_iflag)
2313                 == RELEVANT_IFLAG(old_termios->c_iflag)))
2314           return;
2315
2316         mgslpc_change_params(info, tty);
2317
2318         /* Handle transition to B0 status */
2319         if (old_termios->c_cflag & CBAUD &&
2320             !(tty->termios.c_cflag & CBAUD)) {
2321                 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
2322                 spin_lock_irqsave(&info->lock, flags);
2323                 set_signals(info);
2324                 spin_unlock_irqrestore(&info->lock, flags);
2325         }
2326
2327         /* Handle transition away from B0 status */
2328         if (!(old_termios->c_cflag & CBAUD) &&
2329             tty->termios.c_cflag & CBAUD) {
2330                 info->serial_signals |= SerialSignal_DTR;
2331                 if (!(tty->termios.c_cflag & CRTSCTS) ||
2332                     !test_bit(TTY_THROTTLED, &tty->flags)) {
2333                         info->serial_signals |= SerialSignal_RTS;
2334                 }
2335                 spin_lock_irqsave(&info->lock, flags);
2336                 set_signals(info);
2337                 spin_unlock_irqrestore(&info->lock, flags);
2338         }
2339
2340         /* Handle turning off CRTSCTS */
2341         if (old_termios->c_cflag & CRTSCTS &&
2342             !(tty->termios.c_cflag & CRTSCTS)) {
2343                 tty->hw_stopped = 0;
2344                 tx_release(tty);
2345         }
2346 }
2347
2348 static void mgslpc_close(struct tty_struct *tty, struct file * filp)
2349 {
2350         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2351         struct tty_port *port = &info->port;
2352
2353         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_close"))
2354                 return;
2355
2356         if (debug_level >= DEBUG_LEVEL_INFO)
2357                 printk("%s(%d):mgslpc_close(%s) entry, count=%d\n",
2358                          __FILE__, __LINE__, info->device_name, port->count);
2359
2360         WARN_ON(!port->count);
2361
2362         if (tty_port_close_start(port, tty, filp) == 0)
2363                 goto cleanup;
2364
2365         if (port->flags & ASYNC_INITIALIZED)
2366                 mgslpc_wait_until_sent(tty, info->timeout);
2367
2368         mgslpc_flush_buffer(tty);
2369
2370         tty_ldisc_flush(tty);
2371         shutdown(info, tty);
2372         
2373         tty_port_close_end(port, tty);
2374         tty_port_tty_set(port, NULL);
2375 cleanup:
2376         if (debug_level >= DEBUG_LEVEL_INFO)
2377                 printk("%s(%d):mgslpc_close(%s) exit, count=%d\n", __FILE__, __LINE__,
2378                         tty->driver->name, port->count);
2379 }
2380
2381 /* Wait until the transmitter is empty.
2382  */
2383 static void mgslpc_wait_until_sent(struct tty_struct *tty, int timeout)
2384 {
2385         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2386         unsigned long orig_jiffies, char_time;
2387
2388         if (!info)
2389                 return;
2390
2391         if (debug_level >= DEBUG_LEVEL_INFO)
2392                 printk("%s(%d):mgslpc_wait_until_sent(%s) entry\n",
2393                          __FILE__, __LINE__, info->device_name);
2394
2395         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_wait_until_sent"))
2396                 return;
2397
2398         if (!(info->port.flags & ASYNC_INITIALIZED))
2399                 goto exit;
2400
2401         orig_jiffies = jiffies;
2402
2403         /* Set check interval to 1/5 of estimated time to
2404          * send a character, and make it at least 1. The check
2405          * interval should also be less than the timeout.
2406          * Note: use tight timings here to satisfy the NIST-PCTS.
2407          */
2408
2409         if (info->params.data_rate) {
2410                 char_time = info->timeout/(32 * 5);
2411                 if (!char_time)
2412                         char_time++;
2413         } else
2414                 char_time = 1;
2415
2416         if (timeout)
2417                 char_time = min_t(unsigned long, char_time, timeout);
2418
2419         if (info->params.mode == MGSL_MODE_HDLC) {
2420                 while (info->tx_active) {
2421                         msleep_interruptible(jiffies_to_msecs(char_time));
2422                         if (signal_pending(current))
2423                                 break;
2424                         if (timeout && time_after(jiffies, orig_jiffies + timeout))
2425                                 break;
2426                 }
2427         } else {
2428                 while ((info->tx_count || info->tx_active) &&
2429                         info->tx_enabled) {
2430                         msleep_interruptible(jiffies_to_msecs(char_time));
2431                         if (signal_pending(current))
2432                                 break;
2433                         if (timeout && time_after(jiffies, orig_jiffies + timeout))
2434                                 break;
2435                 }
2436         }
2437
2438 exit:
2439         if (debug_level >= DEBUG_LEVEL_INFO)
2440                 printk("%s(%d):mgslpc_wait_until_sent(%s) exit\n",
2441                          __FILE__, __LINE__, info->device_name);
2442 }
2443
2444 /* Called by tty_hangup() when a hangup is signaled.
2445  * This is the same as closing all open files for the port.
2446  */
2447 static void mgslpc_hangup(struct tty_struct *tty)
2448 {
2449         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2450
2451         if (debug_level >= DEBUG_LEVEL_INFO)
2452                 printk("%s(%d):mgslpc_hangup(%s)\n",
2453                          __FILE__, __LINE__, info->device_name);
2454
2455         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_hangup"))
2456                 return;
2457
2458         mgslpc_flush_buffer(tty);
2459         shutdown(info, tty);
2460         tty_port_hangup(&info->port);
2461 }
2462
2463 static int carrier_raised(struct tty_port *port)
2464 {
2465         MGSLPC_INFO *info = container_of(port, MGSLPC_INFO, port);
2466         unsigned long flags;
2467
2468         spin_lock_irqsave(&info->lock, flags);
2469         get_signals(info);
2470         spin_unlock_irqrestore(&info->lock, flags);
2471
2472         if (info->serial_signals & SerialSignal_DCD)
2473                 return 1;
2474         return 0;
2475 }
2476
2477 static void dtr_rts(struct tty_port *port, int onoff)
2478 {
2479         MGSLPC_INFO *info = container_of(port, MGSLPC_INFO, port);
2480         unsigned long flags;
2481
2482         spin_lock_irqsave(&info->lock, flags);
2483         if (onoff)
2484                 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
2485         else
2486                 info->serial_signals &= ~SerialSignal_RTS + SerialSignal_DTR;
2487         set_signals(info);
2488         spin_unlock_irqrestore(&info->lock, flags);
2489 }
2490
2491
2492 static int mgslpc_open(struct tty_struct *tty, struct file * filp)
2493 {
2494         MGSLPC_INFO     *info;
2495         struct tty_port *port;
2496         int             retval, line;
2497         unsigned long   flags;
2498
2499         /* verify range of specified line number */
2500         line = tty->index;
2501         if (line >= mgslpc_device_count) {
2502                 printk("%s(%d):mgslpc_open with invalid line #%d.\n",
2503                         __FILE__, __LINE__, line);
2504                 return -ENODEV;
2505         }
2506
2507         /* find the info structure for the specified line */
2508         info = mgslpc_device_list;
2509         while(info && info->line != line)
2510                 info = info->next_device;
2511         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_open"))
2512                 return -ENODEV;
2513
2514         port = &info->port;
2515         tty->driver_data = info;
2516         tty_port_tty_set(port, tty);
2517
2518         if (debug_level >= DEBUG_LEVEL_INFO)
2519                 printk("%s(%d):mgslpc_open(%s), old ref count = %d\n",
2520                          __FILE__, __LINE__, tty->driver->name, port->count);
2521
2522         /* If port is closing, signal caller to try again */
2523         if (tty_hung_up_p(filp) || port->flags & ASYNC_CLOSING){
2524                 if (port->flags & ASYNC_CLOSING)
2525                         interruptible_sleep_on(&port->close_wait);
2526                 retval = ((port->flags & ASYNC_HUP_NOTIFY) ?
2527                         -EAGAIN : -ERESTARTSYS);
2528                 goto cleanup;
2529         }
2530
2531         tty->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
2532
2533         spin_lock_irqsave(&info->netlock, flags);
2534         if (info->netcount) {
2535                 retval = -EBUSY;
2536                 spin_unlock_irqrestore(&info->netlock, flags);
2537                 goto cleanup;
2538         }
2539         spin_lock(&port->lock);
2540         port->count++;
2541         spin_unlock(&port->lock);
2542         spin_unlock_irqrestore(&info->netlock, flags);
2543
2544         if (port->count == 1) {
2545                 /* 1st open on this device, init hardware */
2546                 retval = startup(info, tty);
2547                 if (retval < 0)
2548                         goto cleanup;
2549         }
2550
2551         retval = tty_port_block_til_ready(&info->port, tty, filp);
2552         if (retval) {
2553                 if (debug_level >= DEBUG_LEVEL_INFO)
2554                         printk("%s(%d):block_til_ready(%s) returned %d\n",
2555                                  __FILE__, __LINE__, info->device_name, retval);
2556                 goto cleanup;
2557         }
2558
2559         if (debug_level >= DEBUG_LEVEL_INFO)
2560                 printk("%s(%d):mgslpc_open(%s) success\n",
2561                          __FILE__, __LINE__, info->device_name);
2562         retval = 0;
2563
2564 cleanup:
2565         return retval;
2566 }
2567
2568 /*
2569  * /proc fs routines....
2570  */
2571
2572 static inline void line_info(struct seq_file *m, MGSLPC_INFO *info)
2573 {
2574         char    stat_buf[30];
2575         unsigned long flags;
2576
2577         seq_printf(m, "%s:io:%04X irq:%d",
2578                       info->device_name, info->io_base, info->irq_level);
2579
2580         /* output current serial signal states */
2581         spin_lock_irqsave(&info->lock, flags);
2582         get_signals(info);
2583         spin_unlock_irqrestore(&info->lock, flags);
2584
2585         stat_buf[0] = 0;
2586         stat_buf[1] = 0;
2587         if (info->serial_signals & SerialSignal_RTS)
2588                 strcat(stat_buf, "|RTS");
2589         if (info->serial_signals & SerialSignal_CTS)
2590                 strcat(stat_buf, "|CTS");
2591         if (info->serial_signals & SerialSignal_DTR)
2592                 strcat(stat_buf, "|DTR");
2593         if (info->serial_signals & SerialSignal_DSR)
2594                 strcat(stat_buf, "|DSR");
2595         if (info->serial_signals & SerialSignal_DCD)
2596                 strcat(stat_buf, "|CD");
2597         if (info->serial_signals & SerialSignal_RI)
2598                 strcat(stat_buf, "|RI");
2599
2600         if (info->params.mode == MGSL_MODE_HDLC) {
2601                 seq_printf(m, " HDLC txok:%d rxok:%d",
2602                               info->icount.txok, info->icount.rxok);
2603                 if (info->icount.txunder)
2604                         seq_printf(m, " txunder:%d", info->icount.txunder);
2605                 if (info->icount.txabort)
2606                         seq_printf(m, " txabort:%d", info->icount.txabort);
2607                 if (info->icount.rxshort)
2608                         seq_printf(m, " rxshort:%d", info->icount.rxshort);
2609                 if (info->icount.rxlong)
2610                         seq_printf(m, " rxlong:%d", info->icount.rxlong);
2611                 if (info->icount.rxover)
2612                         seq_printf(m, " rxover:%d", info->icount.rxover);
2613                 if (info->icount.rxcrc)
2614                         seq_printf(m, " rxcrc:%d", info->icount.rxcrc);
2615         } else {
2616                 seq_printf(m, " ASYNC tx:%d rx:%d",
2617                               info->icount.tx, info->icount.rx);
2618                 if (info->icount.frame)
2619                         seq_printf(m, " fe:%d", info->icount.frame);
2620                 if (info->icount.parity)
2621                         seq_printf(m, " pe:%d", info->icount.parity);
2622                 if (info->icount.brk)
2623                         seq_printf(m, " brk:%d", info->icount.brk);
2624                 if (info->icount.overrun)
2625                         seq_printf(m, " oe:%d", info->icount.overrun);
2626         }
2627
2628         /* Append serial signal status to end */
2629         seq_printf(m, " %s\n", stat_buf+1);
2630
2631         seq_printf(m, "txactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
2632                        info->tx_active,info->bh_requested,info->bh_running,
2633                        info->pending_bh);
2634 }
2635
2636 /* Called to print information about devices
2637  */
2638 static int mgslpc_proc_show(struct seq_file *m, void *v)
2639 {
2640         MGSLPC_INFO *info;
2641
2642         seq_printf(m, "synclink driver:%s\n", driver_version);
2643
2644         info = mgslpc_device_list;
2645         while (info) {
2646                 line_info(m, info);
2647                 info = info->next_device;
2648         }
2649         return 0;
2650 }
2651
2652 static int mgslpc_proc_open(struct inode *inode, struct file *file)
2653 {
2654         return single_open(file, mgslpc_proc_show, NULL);
2655 }
2656
2657 static const struct file_operations mgslpc_proc_fops = {
2658         .owner          = THIS_MODULE,
2659         .open           = mgslpc_proc_open,
2660         .read           = seq_read,
2661         .llseek         = seq_lseek,
2662         .release        = single_release,
2663 };
2664
2665 static int rx_alloc_buffers(MGSLPC_INFO *info)
2666 {
2667         /* each buffer has header and data */
2668         info->rx_buf_size = sizeof(RXBUF) + info->max_frame_size;
2669
2670         /* calculate total allocation size for 8 buffers */
2671         info->rx_buf_total_size = info->rx_buf_size * 8;
2672
2673         /* limit total allocated memory */
2674         if (info->rx_buf_total_size > 0x10000)
2675                 info->rx_buf_total_size = 0x10000;
2676
2677         /* calculate number of buffers */
2678         info->rx_buf_count = info->rx_buf_total_size / info->rx_buf_size;
2679
2680         info->rx_buf = kmalloc(info->rx_buf_total_size, GFP_KERNEL);
2681         if (info->rx_buf == NULL)
2682                 return -ENOMEM;
2683
2684         rx_reset_buffers(info);
2685         return 0;
2686 }
2687
2688 static void rx_free_buffers(MGSLPC_INFO *info)
2689 {
2690         kfree(info->rx_buf);
2691         info->rx_buf = NULL;
2692 }
2693
2694 static int claim_resources(MGSLPC_INFO *info)
2695 {
2696         if (rx_alloc_buffers(info) < 0) {
2697                 printk("Can't allocate rx buffer %s\n", info->device_name);
2698                 release_resources(info);
2699                 return -ENODEV;
2700         }
2701         return 0;
2702 }
2703
2704 static void release_resources(MGSLPC_INFO *info)
2705 {
2706         if (debug_level >= DEBUG_LEVEL_INFO)
2707                 printk("release_resources(%s)\n", info->device_name);
2708         rx_free_buffers(info);
2709 }
2710
2711 /* Add the specified device instance data structure to the
2712  * global linked list of devices and increment the device count.
2713  *
2714  * Arguments:           info    pointer to device instance data
2715  */
2716 static int mgslpc_add_device(MGSLPC_INFO *info)
2717 {
2718         MGSLPC_INFO *current_dev = NULL;
2719         struct device *tty_dev;
2720         int ret;
2721
2722         info->next_device = NULL;
2723         info->line = mgslpc_device_count;
2724         sprintf(info->device_name,"ttySLP%d",info->line);
2725
2726         if (info->line < MAX_DEVICE_COUNT) {
2727                 if (maxframe[info->line])
2728                         info->max_frame_size = maxframe[info->line];
2729         }
2730
2731         mgslpc_device_count++;
2732
2733         if (!mgslpc_device_list)
2734                 mgslpc_device_list = info;
2735         else {
2736                 current_dev = mgslpc_device_list;
2737                 while (current_dev->next_device)
2738                         current_dev = current_dev->next_device;
2739                 current_dev->next_device = info;
2740         }
2741
2742         if (info->max_frame_size < 4096)
2743                 info->max_frame_size = 4096;
2744         else if (info->max_frame_size > 65535)
2745                 info->max_frame_size = 65535;
2746
2747         printk("SyncLink PC Card %s:IO=%04X IRQ=%d\n",
2748                 info->device_name, info->io_base, info->irq_level);
2749
2750 #if SYNCLINK_GENERIC_HDLC
2751         ret = hdlcdev_init(info);
2752         if (ret != 0)
2753                 goto failed;
2754 #endif
2755
2756         tty_dev = tty_port_register_device(&info->port, serial_driver, info->line,
2757                         &info->p_dev->dev);
2758         if (IS_ERR(tty_dev)) {
2759                 ret = PTR_ERR(tty_dev);
2760 #if SYNCLINK_GENERIC_HDLC
2761                 hdlcdev_exit(info);
2762 #endif
2763                 goto failed;
2764         }
2765
2766         return 0;
2767
2768 failed:
2769         if (current_dev)
2770                 current_dev->next_device = NULL;
2771         else
2772                 mgslpc_device_list = NULL;
2773         mgslpc_device_count--;
2774         return ret;
2775 }
2776
2777 static void mgslpc_remove_device(MGSLPC_INFO *remove_info)
2778 {
2779         MGSLPC_INFO *info = mgslpc_device_list;
2780         MGSLPC_INFO *last = NULL;
2781
2782         while(info) {
2783                 if (info == remove_info) {
2784                         if (last)
2785                                 last->next_device = info->next_device;
2786                         else
2787                                 mgslpc_device_list = info->next_device;
2788                         tty_unregister_device(serial_driver, info->line);
2789 #if SYNCLINK_GENERIC_HDLC
2790                         hdlcdev_exit(info);
2791 #endif
2792                         release_resources(info);
2793                         tty_port_destroy(&info->port);
2794                         kfree(info);
2795                         mgslpc_device_count--;
2796                         return;
2797                 }
2798                 last = info;
2799                 info = info->next_device;
2800         }
2801 }
2802
2803 static const struct pcmcia_device_id mgslpc_ids[] = {
2804         PCMCIA_DEVICE_MANF_CARD(0x02c5, 0x0050),
2805         PCMCIA_DEVICE_NULL
2806 };
2807 MODULE_DEVICE_TABLE(pcmcia, mgslpc_ids);
2808
2809 static struct pcmcia_driver mgslpc_driver = {
2810         .owner          = THIS_MODULE,
2811         .name           = "synclink_cs",
2812         .probe          = mgslpc_probe,
2813         .remove         = mgslpc_detach,
2814         .id_table       = mgslpc_ids,
2815         .suspend        = mgslpc_suspend,
2816         .resume         = mgslpc_resume,
2817 };
2818
2819 static const struct tty_operations mgslpc_ops = {
2820         .open = mgslpc_open,
2821         .close = mgslpc_close,
2822         .write = mgslpc_write,
2823         .put_char = mgslpc_put_char,
2824         .flush_chars = mgslpc_flush_chars,
2825         .write_room = mgslpc_write_room,
2826         .chars_in_buffer = mgslpc_chars_in_buffer,
2827         .flush_buffer = mgslpc_flush_buffer,
2828         .ioctl = mgslpc_ioctl,
2829         .throttle = mgslpc_throttle,
2830         .unthrottle = mgslpc_unthrottle,
2831         .send_xchar = mgslpc_send_xchar,
2832         .break_ctl = mgslpc_break,
2833         .wait_until_sent = mgslpc_wait_until_sent,
2834         .set_termios = mgslpc_set_termios,
2835         .stop = tx_pause,
2836         .start = tx_release,
2837         .hangup = mgslpc_hangup,
2838         .tiocmget = tiocmget,
2839         .tiocmset = tiocmset,
2840         .get_icount = mgslpc_get_icount,
2841         .proc_fops = &mgslpc_proc_fops,
2842 };
2843
2844 static int __init synclink_cs_init(void)
2845 {
2846         int rc;
2847
2848         if (break_on_load) {
2849                 mgslpc_get_text_ptr();
2850                 BREAKPOINT();
2851         }
2852
2853         serial_driver = tty_alloc_driver(MAX_DEVICE_COUNT,
2854                         TTY_DRIVER_REAL_RAW |
2855                         TTY_DRIVER_DYNAMIC_DEV);
2856         if (IS_ERR(serial_driver)) {
2857                 rc = PTR_ERR(serial_driver);
2858                 goto err;
2859         }
2860
2861         /* Initialize the tty_driver structure */
2862         serial_driver->driver_name = "synclink_cs";
2863         serial_driver->name = "ttySLP";
2864         serial_driver->major = ttymajor;
2865         serial_driver->minor_start = 64;
2866         serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
2867         serial_driver->subtype = SERIAL_TYPE_NORMAL;
2868         serial_driver->init_termios = tty_std_termios;
2869         serial_driver->init_termios.c_cflag =
2870         B9600 | CS8 | CREAD | HUPCL | CLOCAL;
2871         tty_set_operations(serial_driver, &mgslpc_ops);
2872
2873         rc = tty_register_driver(serial_driver);
2874         if (rc < 0) {
2875                 printk(KERN_ERR "%s(%d):Couldn't register serial driver\n",
2876                                 __FILE__, __LINE__);
2877                 goto err_put_tty;
2878         }
2879
2880         rc = pcmcia_register_driver(&mgslpc_driver);
2881         if (rc < 0)
2882                 goto err_unreg_tty;
2883
2884         printk(KERN_INFO "%s %s, tty major#%d\n", driver_name, driver_version,
2885                         serial_driver->major);
2886
2887         return 0;
2888 err_unreg_tty:
2889         tty_unregister_driver(serial_driver);
2890 err_put_tty:
2891         put_tty_driver(serial_driver);
2892 err:
2893         return rc;
2894 }
2895
2896 static void __exit synclink_cs_exit(void)
2897 {
2898         pcmcia_unregister_driver(&mgslpc_driver);
2899         tty_unregister_driver(serial_driver);
2900         put_tty_driver(serial_driver);
2901 }
2902
2903 module_init(synclink_cs_init);
2904 module_exit(synclink_cs_exit);
2905
2906 static void mgslpc_set_rate(MGSLPC_INFO *info, unsigned char channel, unsigned int rate)
2907 {
2908         unsigned int M, N;
2909         unsigned char val;
2910
2911         /* note:standard BRG mode is broken in V3.2 chip
2912          * so enhanced mode is always used
2913          */
2914
2915         if (rate) {
2916                 N = 3686400 / rate;
2917                 if (!N)
2918                         N = 1;
2919                 N >>= 1;
2920                 for (M = 1; N > 64 && M < 16; M++)
2921                         N >>= 1;
2922                 N--;
2923
2924                 /* BGR[5..0] = N
2925                  * BGR[9..6] = M
2926                  * BGR[7..0] contained in BGR register
2927                  * BGR[9..8] contained in CCR2[7..6]
2928                  * divisor = (N+1)*2^M
2929                  *
2930                  * Note: M *must* not be zero (causes asymetric duty cycle)
2931                  */
2932                 write_reg(info, (unsigned char) (channel + BGR),
2933                                   (unsigned char) ((M << 6) + N));
2934                 val = read_reg(info, (unsigned char) (channel + CCR2)) & 0x3f;
2935                 val |= ((M << 4) & 0xc0);
2936                 write_reg(info, (unsigned char) (channel + CCR2), val);
2937         }
2938 }
2939
2940 /* Enabled the AUX clock output at the specified frequency.
2941  */
2942 static void enable_auxclk(MGSLPC_INFO *info)
2943 {
2944         unsigned char val;
2945
2946         /* MODE
2947          *
2948          * 07..06  MDS[1..0] 10 = transparent HDLC mode
2949          * 05      ADM Address Mode, 0 = no addr recognition
2950          * 04      TMD Timer Mode, 0 = external
2951          * 03      RAC Receiver Active, 0 = inactive
2952          * 02      RTS 0=RTS active during xmit, 1=RTS always active
2953          * 01      TRS Timer Resolution, 1=512
2954          * 00      TLP Test Loop, 0 = no loop
2955          *
2956          * 1000 0010
2957          */
2958         val = 0x82;
2959
2960         /* channel B RTS is used to enable AUXCLK driver on SP505 */
2961         if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
2962                 val |= BIT2;
2963         write_reg(info, CHB + MODE, val);
2964
2965         /* CCR0
2966          *
2967          * 07      PU Power Up, 1=active, 0=power down
2968          * 06      MCE Master Clock Enable, 1=enabled
2969          * 05      Reserved, 0
2970          * 04..02  SC[2..0] Encoding
2971          * 01..00  SM[1..0] Serial Mode, 00=HDLC
2972          *
2973          * 11000000
2974          */
2975         write_reg(info, CHB + CCR0, 0xc0);
2976
2977         /* CCR1
2978          *
2979          * 07      SFLG Shared Flag, 0 = disable shared flags
2980          * 06      GALP Go Active On Loop, 0 = not used
2981          * 05      GLP Go On Loop, 0 = not used
2982          * 04      ODS Output Driver Select, 1=TxD is push-pull output
2983          * 03      ITF Interframe Time Fill, 0=mark, 1=flag
2984          * 02..00  CM[2..0] Clock Mode
2985          *
2986          * 0001 0111
2987          */
2988         write_reg(info, CHB + CCR1, 0x17);
2989
2990         /* CCR2 (Channel B)
2991          *
2992          * 07..06  BGR[9..8] Baud rate bits 9..8
2993          * 05      BDF Baud rate divisor factor, 0=1, 1=BGR value
2994          * 04      SSEL Clock source select, 1=submode b
2995          * 03      TOE 0=TxCLK is input, 1=TxCLK is output
2996          * 02      RWX Read/Write Exchange 0=disabled
2997          * 01      C32, CRC select, 0=CRC-16, 1=CRC-32
2998          * 00      DIV, data inversion 0=disabled, 1=enabled
2999          *
3000          * 0011 1000
3001          */
3002         if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
3003                 write_reg(info, CHB + CCR2, 0x38);
3004         else
3005                 write_reg(info, CHB + CCR2, 0x30);
3006
3007         /* CCR4
3008          *
3009          * 07      MCK4 Master Clock Divide by 4, 1=enabled
3010          * 06      EBRG Enhanced Baud Rate Generator Mode, 1=enabled
3011          * 05      TST1 Test Pin, 0=normal operation
3012          * 04      ICD Ivert Carrier Detect, 1=enabled (active low)
3013          * 03..02  Reserved, must be 0
3014          * 01..00  RFT[1..0] RxFIFO Threshold 00=32 bytes
3015          *
3016          * 0101 0000
3017          */
3018         write_reg(info, CHB + CCR4, 0x50);
3019
3020         /* if auxclk not enabled, set internal BRG so
3021          * CTS transitions can be detected (requires TxC)
3022          */
3023         if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
3024                 mgslpc_set_rate(info, CHB, info->params.clock_speed);
3025         else
3026                 mgslpc_set_rate(info, CHB, 921600);
3027 }
3028
3029 static void loopback_enable(MGSLPC_INFO *info)
3030 {
3031         unsigned char val;
3032
3033         /* CCR1:02..00  CM[2..0] Clock Mode = 111 (clock mode 7) */
3034         val = read_reg(info, CHA + CCR1) | (BIT2 + BIT1 + BIT0);
3035         write_reg(info, CHA + CCR1, val);
3036
3037         /* CCR2:04 SSEL Clock source select, 1=submode b */
3038         val = read_reg(info, CHA + CCR2) | (BIT4 + BIT5);
3039         write_reg(info, CHA + CCR2, val);
3040
3041         /* set LinkSpeed if available, otherwise default to 2Mbps */
3042         if (info->params.clock_speed)
3043                 mgslpc_set_rate(info, CHA, info->params.clock_speed);
3044         else
3045                 mgslpc_set_rate(info, CHA, 1843200);
3046
3047         /* MODE:00 TLP Test Loop, 1=loopback enabled */
3048         val = read_reg(info, CHA + MODE) | BIT0;
3049         write_reg(info, CHA + MODE, val);
3050 }
3051
3052 static void hdlc_mode(MGSLPC_INFO *info)
3053 {
3054         unsigned char val;
3055         unsigned char clkmode, clksubmode;
3056
3057         /* disable all interrupts */
3058         irq_disable(info, CHA, 0xffff);
3059         irq_disable(info, CHB, 0xffff);
3060         port_irq_disable(info, 0xff);
3061
3062         /* assume clock mode 0a, rcv=RxC xmt=TxC */
3063         clkmode = clksubmode = 0;
3064         if (info->params.flags & HDLC_FLAG_RXC_DPLL
3065             && info->params.flags & HDLC_FLAG_TXC_DPLL) {
3066                 /* clock mode 7a, rcv = DPLL, xmt = DPLL */
3067                 clkmode = 7;
3068         } else if (info->params.flags & HDLC_FLAG_RXC_BRG
3069                  && info->params.flags & HDLC_FLAG_TXC_BRG) {
3070                 /* clock mode 7b, rcv = BRG, xmt = BRG */
3071                 clkmode = 7;
3072                 clksubmode = 1;
3073         } else if (info->params.flags & HDLC_FLAG_RXC_DPLL) {
3074                 if (info->params.flags & HDLC_FLAG_TXC_BRG) {
3075                         /* clock mode 6b, rcv = DPLL, xmt = BRG/16 */
3076                         clkmode = 6;
3077                         clksubmode = 1;
3078                 } else {
3079                         /* clock mode 6a, rcv = DPLL, xmt = TxC */
3080                         clkmode = 6;
3081                 }
3082         } else if (info->params.flags & HDLC_FLAG_TXC_BRG) {
3083                 /* clock mode 0b, rcv = RxC, xmt = BRG */
3084                 clksubmode = 1;
3085         }
3086
3087         /* MODE
3088          *
3089          * 07..06  MDS[1..0] 10 = transparent HDLC mode
3090          * 05      ADM Address Mode, 0 = no addr recognition
3091          * 04      TMD Timer Mode, 0 = external
3092          * 03      RAC Receiver Active, 0 = inactive
3093          * 02      RTS 0=RTS active during xmit, 1=RTS always active
3094          * 01      TRS Timer Resolution, 1=512
3095          * 00      TLP Test Loop, 0 = no loop
3096          *
3097          * 1000 0010
3098          */
3099         val = 0x82;
3100         if (info->params.loopback)
3101                 val |= BIT0;
3102
3103         /* preserve RTS state */
3104         if (info->serial_signals & SerialSignal_RTS)
3105                 val |= BIT2;
3106         write_reg(info, CHA + MODE, val);
3107
3108         /* CCR0
3109          *
3110          * 07      PU Power Up, 1=active, 0=power down
3111          * 06      MCE Master Clock Enable, 1=enabled
3112          * 05      Reserved, 0
3113          * 04..02  SC[2..0] Encoding
3114          * 01..00  SM[1..0] Serial Mode, 00=HDLC
3115          *
3116          * 11000000
3117          */
3118         val = 0xc0;
3119         switch (info->params.encoding)
3120         {
3121         case HDLC_ENCODING_NRZI:
3122                 val |= BIT3;
3123                 break;
3124         case HDLC_ENCODING_BIPHASE_SPACE:
3125                 val |= BIT4;
3126                 break;          // FM0
3127         case HDLC_ENCODING_BIPHASE_MARK:
3128                 val |= BIT4 + BIT2;
3129                 break;          // FM1
3130         case HDLC_ENCODING_BIPHASE_LEVEL:
3131                 val |= BIT4 + BIT3;
3132                 break;          // Manchester
3133         }
3134         write_reg(info, CHA + CCR0, val);
3135
3136         /* CCR1
3137          *
3138          * 07      SFLG Shared Flag, 0 = disable shared flags
3139          * 06      GALP Go Active On Loop, 0 = not used
3140          * 05      GLP Go On Loop, 0 = not used
3141          * 04      ODS Output Driver Select, 1=TxD is push-pull output
3142          * 03      ITF Interframe Time Fill, 0=mark, 1=flag
3143          * 02..00  CM[2..0] Clock Mode
3144          *
3145          * 0001 0000
3146          */
3147         val = 0x10 + clkmode;
3148         write_reg(info, CHA + CCR1, val);
3149
3150         /* CCR2
3151          *
3152          * 07..06  BGR[9..8] Baud rate bits 9..8
3153          * 05      BDF Baud rate divisor factor, 0=1, 1=BGR value
3154          * 04      SSEL Clock source select, 1=submode b
3155          * 03      TOE 0=TxCLK is input, 0=TxCLK is input
3156          * 02      RWX Read/Write Exchange 0=disabled
3157          * 01      C32, CRC select, 0=CRC-16, 1=CRC-32
3158          * 00      DIV, data inversion 0=disabled, 1=enabled
3159          *
3160          * 0000 0000
3161          */
3162         val = 0x00;
3163         if (clkmode == 2 || clkmode == 3 || clkmode == 6
3164             || clkmode == 7 || (clkmode == 0 && clksubmode == 1))
3165                 val |= BIT5;
3166         if (clksubmode)
3167                 val |= BIT4;
3168         if (info->params.crc_type == HDLC_CRC_32_CCITT)
3169                 val |= BIT1;
3170         if (info->params.encoding == HDLC_ENCODING_NRZB)
3171                 val |= BIT0;
3172         write_reg(info, CHA + CCR2, val);
3173
3174         /* CCR3
3175          *
3176          * 07..06  PRE[1..0] Preamble count 00=1, 01=2, 10=4, 11=8
3177          * 05      EPT Enable preamble transmission, 1=enabled
3178          * 04      RADD Receive address pushed to FIFO, 0=disabled
3179          * 03      CRL CRC Reset Level, 0=FFFF
3180          * 02      RCRC Rx CRC 0=On 1=Off
3181          * 01      TCRC Tx CRC 0=On 1=Off
3182          * 00      PSD DPLL Phase Shift Disable
3183          *
3184          * 0000 0000
3185          */
3186         val = 0x00;
3187         if (info->params.crc_type == HDLC_CRC_NONE)
3188                 val |= BIT2 + BIT1;
3189         if (info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE)
3190                 val |= BIT5;
3191         switch (info->params.preamble_length)
3192         {
3193         case HDLC_PREAMBLE_LENGTH_16BITS:
3194                 val |= BIT6;
3195                 break;
3196         case HDLC_PREAMBLE_LENGTH_32BITS:
3197                 val |= BIT6;
3198                 break;
3199         case HDLC_PREAMBLE_LENGTH_64BITS:
3200                 val |= BIT7 + BIT6;
3201                 break;
3202         }
3203         write_reg(info, CHA + CCR3, val);
3204
3205         /* PRE - Preamble pattern */
3206         val = 0;
3207         switch (info->params.preamble)
3208         {
3209         case HDLC_PREAMBLE_PATTERN_FLAGS: val = 0x7e; break;
3210         case HDLC_PREAMBLE_PATTERN_10:    val = 0xaa; break;
3211         case HDLC_PREAMBLE_PATTERN_01:    val = 0x55; break;
3212         case HDLC_PREAMBLE_PATTERN_ONES:  val = 0xff; break;
3213         }
3214         write_reg(info, CHA + PRE, val);
3215
3216         /* CCR4
3217          *
3218          * 07      MCK4 Master Clock Divide by 4, 1=enabled
3219          * 06      EBRG Enhanced Baud Rate Generator Mode, 1=enabled
3220          * 05      TST1 Test Pin, 0=normal operation
3221          * 04      ICD Ivert Carrier Detect, 1=enabled (active low)
3222          * 03..02  Reserved, must be 0
3223          * 01..00  RFT[1..0] RxFIFO Threshold 00=32 bytes
3224          *
3225          * 0101 0000
3226          */
3227         val = 0x50;
3228         write_reg(info, CHA + CCR4, val);
3229         if (info->params.flags & HDLC_FLAG_RXC_DPLL)
3230                 mgslpc_set_rate(info, CHA, info->params.clock_speed * 16);
3231         else
3232                 mgslpc_set_rate(info, CHA, info->params.clock_speed);
3233
3234         /* RLCR Receive length check register
3235          *
3236          * 7     1=enable receive length check
3237          * 6..0  Max frame length = (RL + 1) * 32
3238          */
3239         write_reg(info, CHA + RLCR, 0);
3240
3241         /* XBCH Transmit Byte Count High
3242          *
3243          * 07      DMA mode, 0 = interrupt driven
3244          * 06      NRM, 0=ABM (ignored)
3245          * 05      CAS Carrier Auto Start
3246          * 04      XC Transmit Continuously (ignored)
3247          * 03..00  XBC[10..8] Transmit byte count bits 10..8
3248          *
3249          * 0000 0000
3250          */
3251         val = 0x00;
3252         if (info->params.flags & HDLC_FLAG_AUTO_DCD)
3253                 val |= BIT5;
3254         write_reg(info, CHA + XBCH, val);
3255         enable_auxclk(info);
3256         if (info->params.loopback || info->testing_irq)
3257                 loopback_enable(info);
3258         if (info->params.flags & HDLC_FLAG_AUTO_CTS)
3259         {
3260                 irq_enable(info, CHB, IRQ_CTS);
3261                 /* PVR[3] 1=AUTO CTS active */
3262                 set_reg_bits(info, CHA + PVR, BIT3);
3263         } else
3264                 clear_reg_bits(info, CHA + PVR, BIT3);
3265
3266         irq_enable(info, CHA,
3267                          IRQ_RXEOM + IRQ_RXFIFO + IRQ_ALLSENT +
3268                          IRQ_UNDERRUN + IRQ_TXFIFO);
3269         issue_command(info, CHA, CMD_TXRESET + CMD_RXRESET);
3270         wait_command_complete(info, CHA);
3271         read_reg16(info, CHA + ISR);    /* clear pending IRQs */
3272
3273         /* Master clock mode enabled above to allow reset commands
3274          * to complete even if no data clocks are present.
3275          *
3276          * Disable master clock mode for normal communications because
3277          * V3.2 of the ESCC2 has a bug that prevents the transmit all sent
3278          * IRQ when in master clock mode.
3279          *
3280          * Leave master clock mode enabled for IRQ test because the
3281          * timer IRQ used by the test can only happen in master clock mode.
3282          */
3283         if (!info->testing_irq)
3284                 clear_reg_bits(info, CHA + CCR0, BIT6);
3285
3286         tx_set_idle(info);
3287
3288         tx_stop(info);