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