1 /*
2 * Telecom Clock driver for Intel NetStructure(tm) MPCBL0010
3 *
4 * Copyright (C) 2005 Kontron Canada
5 *
6 * All rights reserved.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or (at
11 * your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
16 * NON INFRINGEMENT. See the GNU General Public License for more
17 * details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 *
23 * Send feedback to <sebastien.bouchard@ca.kontron.com> and the current
24 * Maintainer <mark.gross@intel.com>
25 *
26 * Description : This is the TELECOM CLOCK module driver for the ATCA
27 * MPCBL0010 ATCA computer.
28 */
29
30 #include <linux/module.h>
31 #include <linux/init.h>
32 #include <linux/kernel.h> /* printk() */
33 #include <linux/fs.h> /* everything... */
34 #include <linux/errno.h> /* error codes */
35 #include <linux/sched.h>
36 #include <linux/slab.h>
37 #include <linux/ioport.h>
38 #include <linux/interrupt.h>
39 #include <linux/spinlock.h>
40 #include <linux/mutex.h>
41 #include <linux/timer.h>
42 #include <linux/sysfs.h>
43 #include <linux/device.h>
44 #include <linux/miscdevice.h>
45 #include <linux/platform_device.h>
46 #include <asm/io.h> /* inb/outb */
47 #include <linux/uaccess.h>
48
49 MODULE_AUTHOR("Sebastien Bouchard <sebastien.bouchard@ca.kontron.com>");
50 MODULE_LICENSE("GPL");
51
52 /*Hardware Reset of the PLL */
53 #define RESET_ON 0x00
54 #define RESET_OFF 0x01
55
56 /* MODE SELECT */
57 #define NORMAL_MODE 0x00
58 #define HOLDOVER_MODE 0x10
59 #define FREERUN_MODE 0x20
60
61 /* FILTER SELECT */
62 #define FILTER_6HZ 0x04
63 #define FILTER_12HZ 0x00
64
65 /* SELECT REFERENCE FREQUENCY */
66 #define REF_CLK1_8kHz 0x00
67 #define REF_CLK2_19_44MHz 0x02
68
69 /* Select primary or secondary redundant clock */
70 #define PRIMARY_CLOCK 0x00
71 #define SECONDARY_CLOCK 0x01
72
73 /* CLOCK TRANSMISSION DEFINE */
74 #define CLK_8kHz 0xff
75 #define CLK_16_384MHz 0xfb
76
77 #define CLK_1_544MHz 0x00
78 #define CLK_2_048MHz 0x01
79 #define CLK_4_096MHz 0x02
80 #define CLK_6_312MHz 0x03
81 #define CLK_8_192MHz 0x04
82 #define CLK_19_440MHz 0x06
83
84 #define CLK_8_592MHz 0x08
85 #define CLK_11_184MHz 0x09
86 #define CLK_34_368MHz 0x0b
87 #define CLK_44_736MHz 0x0a
88
89 /* RECEIVED REFERENCE */
90 #define AMC_B1 0
91 #define AMC_B2 1
92
93 /* HARDWARE SWITCHING DEFINE */
94 #define HW_ENABLE 0x80
95 #define HW_DISABLE 0x00
96
97 /* HARDWARE SWITCHING MODE DEFINE */
98 #define PLL_HOLDOVER 0x40
99 #define LOST_CLOCK 0x00
100
101 /* ALARMS DEFINE */
102 #define UNLOCK_MASK 0x10
103 #define HOLDOVER_MASK 0x20
104 #define SEC_LOST_MASK 0x40
105 #define PRI_LOST_MASK 0x80
106
107 /* INTERRUPT CAUSE DEFINE */
108
109 #define PRI_LOS_01_MASK 0x01
110 #define PRI_LOS_10_MASK 0x02
111
112 #define SEC_LOS_01_MASK 0x04
113 #define SEC_LOS_10_MASK 0x08
114
115 #define HOLDOVER_01_MASK 0x10
116 #define HOLDOVER_10_MASK 0x20
117
118 #define UNLOCK_01_MASK 0x40
119 #define UNLOCK_10_MASK 0x80
120
121 struct tlclk_alarms {
122 __u32 lost_clocks;
123 __u32 lost_primary_clock;
124 __u32 lost_secondary_clock;
125 __u32 primary_clock_back;
126 __u32 secondary_clock_back;
127 __u32 switchover_primary;
128 __u32 switchover_secondary;
129 __u32 pll_holdover;
130 __u32 pll_end_holdover;
131 __u32 pll_lost_sync;
132 __u32 pll_sync;
133 };
134 /* Telecom clock I/O register definition */
135 #define TLCLK_BASE 0xa08
136 #define TLCLK_REG0 TLCLK_BASE
137 #define TLCLK_REG1 (TLCLK_BASE+1)
138 #define TLCLK_REG2 (TLCLK_BASE+2)
139 #define TLCLK_REG3 (TLCLK_BASE+3)
140 #define TLCLK_REG4 (TLCLK_BASE+4)
141 #define TLCLK_REG5 (TLCLK_BASE+5)
142 #define TLCLK_REG6 (TLCLK_BASE+6)
143 #define TLCLK_REG7 (TLCLK_BASE+7)
144
145 #define SET_PORT_BITS(port, mask, val) outb(((inb(port) & mask) | val), port)
146
147 /* 0 = Dynamic allocation of the major device number */
148 #define TLCLK_MAJOR 0
149
150 /* sysfs interface definition:
151 Upon loading the driver will create a sysfs directory under
152 /sys/devices/platform/telco_clock.
153
154 This directory exports the following interfaces. There operation is
155 documented in the MCPBL0010 TPS under the Telecom Clock API section, 11.4.
156 alarms :
157 current_ref :
158 received_ref_clk3a :
159 received_ref_clk3b :
160 enable_clk3a_output :
161 enable_clk3b_output :
162 enable_clka0_output :
163 enable_clka1_output :
164 enable_clkb0_output :
165 enable_clkb1_output :
166 filter_select :
167 hardware_switching :
168 hardware_switching_mode :
169 telclock_version :
170 mode_select :
171 refalign :
172 reset :
173 select_amcb1_transmit_clock :
174 select_amcb2_transmit_clock :
175 select_redundant_clock :
176 select_ref_frequency :
177
178 All sysfs interfaces are integers in hex format, i.e echo 99 > refalign
179 has the same effect as echo 0x99 > refalign.
180 */
181
182 static unsigned int telclk_interrupt;
183
184 static int int_events; /* Event that generate a interrupt */
185 static int got_event; /* if events processing have been done */
186
187 static void switchover_timeout(struct timer_list *t);
188 static struct timer_list switchover_timer;
189 static unsigned long tlclk_timer_data;
190
191 static struct tlclk_alarms *alarm_events;
192
193 static DEFINE_SPINLOCK(event_lock);
194
195 static int tlclk_major = TLCLK_MAJOR;
196
197 static irqreturn_t tlclk_interrupt(int irq, void *dev_id);
198
199 static DECLARE_WAIT_QUEUE_HEAD(wq);
200
201 static unsigned long useflags;
202 static DEFINE_MUTEX(tlclk_mutex);
203
tlclk_open(struct inode * inode,struct file * filp)204 static int tlclk_open(struct inode *inode, struct file *filp)
205 {
206 int result;
207
208 mutex_lock(&tlclk_mutex);
209 if (test_and_set_bit(0, &useflags)) {
210 result = -EBUSY;
211 /* this legacy device is always one per system and it doesn't
212 * know how to handle multiple concurrent clients.
213 */
214 goto out;
215 }
216
217 /* Make sure there is no interrupt pending while
218 * initialising interrupt handler */
219 inb(TLCLK_REG6);
220
221 /* This device is wired through the FPGA IO space of the ATCA blade
222 * we can't share this IRQ */
223 result = request_irq(telclk_interrupt, &tlclk_interrupt,
224 0, "telco_clock", tlclk_interrupt);
225 if (result == -EBUSY)
226 printk(KERN_ERR "tlclk: Interrupt can't be reserved.\n");
227 else
228 inb(TLCLK_REG6); /* Clear interrupt events */
229
230 out:
231 mutex_unlock(&tlclk_mutex);
232 return result;
233 }
234
tlclk_release(struct inode * inode,struct file * filp)235 static int tlclk_release(struct inode *inode, struct file *filp)
236 {
237 free_irq(telclk_interrupt, tlclk_interrupt);
238 clear_bit(0, &useflags);
239
240 return 0;
241 }
242
tlclk_read(struct file * filp,char __user * buf,size_t count,loff_t * f_pos)243 static ssize_t tlclk_read(struct file *filp, char __user *buf, size_t count,
244 loff_t *f_pos)
245 {
246 if (count < sizeof(struct tlclk_alarms))
247 return -EIO;
248 if (mutex_lock_interruptible(&tlclk_mutex))
249 return -EINTR;
250
251
252 wait_event_interruptible(wq, got_event);
253 if (copy_to_user(buf, alarm_events, sizeof(struct tlclk_alarms))) {
254 mutex_unlock(&tlclk_mutex);
255 return -EFAULT;
256 }
257
258 memset(alarm_events, 0, sizeof(struct tlclk_alarms));
259 got_event = 0;
260
261 mutex_unlock(&tlclk_mutex);
262 return sizeof(struct tlclk_alarms);
263 }
264
265 static const struct file_operations tlclk_fops = {
266 .read = tlclk_read,
267 .open = tlclk_open,
268 .release = tlclk_release,
269 .llseek = noop_llseek,
270
271 };
272
273 static struct miscdevice tlclk_miscdev = {
274 .minor = MISC_DYNAMIC_MINOR,
275 .name = "telco_clock",
276 .fops = &tlclk_fops,
277 };
278
show_current_ref(struct device * d,struct device_attribute * attr,char * buf)279 static ssize_t show_current_ref(struct device *d,
280 struct device_attribute *attr, char *buf)
281 {
282 unsigned long ret_val;
283 unsigned long flags;
284
285 spin_lock_irqsave(&event_lock, flags);
286 ret_val = ((inb(TLCLK_REG1) & 0x08) >> 3);
287 spin_unlock_irqrestore(&event_lock, flags);
288
289 return sprintf(buf, "0x%lX\n", ret_val);
290 }
291
292 static DEVICE_ATTR(current_ref, S_IRUGO, show_current_ref, NULL);
293
294
show_telclock_version(struct device * d,struct device_attribute * attr,char * buf)295 static ssize_t show_telclock_version(struct device *d,
296 struct device_attribute *attr, char *buf)
297 {
298 unsigned long ret_val;
299 unsigned long flags;
300
301 spin_lock_irqsave(&event_lock, flags);
302 ret_val = inb(TLCLK_REG5);
303 spin_unlock_irqrestore(&event_lock, flags);
304
305 return sprintf(buf, "0x%lX\n", ret_val);
306 }
307
308 static DEVICE_ATTR(telclock_version, S_IRUGO,
309 show_telclock_version, NULL);
310
show_alarms(struct device * d,struct device_attribute * attr,char * buf)311 static ssize_t show_alarms(struct device *d,
312 struct device_attribute *attr, char *buf)
313 {
314 unsigned long ret_val;
315 unsigned long flags;
316
317 spin_lock_irqsave(&event_lock, flags);
318 ret_val = (inb(TLCLK_REG2) & 0xf0);
319 spin_unlock_irqrestore(&event_lock, flags);
320
321 return sprintf(buf, "0x%lX\n", ret_val);
322 }
323
324 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
325
store_received_ref_clk3a(struct device * d,struct device_attribute * attr,const char * buf,size_t count)326 static ssize_t store_received_ref_clk3a(struct device *d,
327 struct device_attribute *attr, const char *buf, size_t count)
328 {
329 unsigned long tmp;
330 unsigned char val;
331 unsigned long flags;
332
333 sscanf(buf, "%lX", &tmp);
334 dev_dbg(d, ": tmp = 0x%lX\n", tmp);
335
336 val = (unsigned char)tmp;
337 spin_lock_irqsave(&event_lock, flags);
338 SET_PORT_BITS(TLCLK_REG1, 0xef, val);
339 spin_unlock_irqrestore(&event_lock, flags);
340
341 return strnlen(buf, count);
342 }
343
344 static DEVICE_ATTR(received_ref_clk3a, (S_IWUSR|S_IWGRP), NULL,
345 store_received_ref_clk3a);
346
347
store_received_ref_clk3b(struct device * d,struct device_attribute * attr,const char * buf,size_t count)348 static ssize_t store_received_ref_clk3b(struct device *d,
349 struct device_attribute *attr, const char *buf, size_t count)
350 {
351 unsigned long tmp;
352 unsigned char val;
353 unsigned long flags;
354
355 sscanf(buf, "%lX", &tmp);
356 dev_dbg(d, ": tmp = 0x%lX\n", tmp);
357
358 val = (unsigned char)tmp;
359 spin_lock_irqsave(&event_lock, flags);
360 SET_PORT_BITS(TLCLK_REG1, 0xdf, val << 1);
361 spin_unlock_irqrestore(&event_lock, flags);
362
363 return strnlen(buf, count);
364 }
365
366 static DEVICE_ATTR(received_ref_clk3b, (S_IWUSR|S_IWGRP), NULL,
367 store_received_ref_clk3b);
368
369
store_enable_clk3b_output(struct device * d,struct device_attribute * attr,const char * buf,size_t count)370 static ssize_t store_enable_clk3b_output(struct device *d,
371 struct device_attribute *attr, const char *buf, size_t count)
372 {
373 unsigned long tmp;
374 unsigned char val;
375 unsigned long flags;
376
377 sscanf(buf, "%lX", &tmp);
378 dev_dbg(d, ": tmp = 0x%lX\n", tmp);
379
380 val = (unsigned char)tmp;
381 spin_lock_irqsave(&event_lock, flags);
382 SET_PORT_BITS(TLCLK_REG3, 0x7f, val << 7);
383 spin_unlock_irqrestore(&event_lock, flags);
384
385 return strnlen(buf, count);
386 }
387
388 static DEVICE_ATTR(enable_clk3b_output, (S_IWUSR|S_IWGRP), NULL,
389 store_enable_clk3b_output);
390
store_enable_clk3a_output(struct device * d,struct device_attribute * attr,const char * buf,size_t count)391 static ssize_t store_enable_clk3a_output(struct device *d,
392 struct device_attribute *attr, const char *buf, size_t count)
393 {
394 unsigned long flags;
395 unsigned long tmp;
396 unsigned char val;
397
398 sscanf(buf, "%lX", &tmp);
399 dev_dbg(d, "tmp = 0x%lX\n", tmp);
400
401 val = (unsigned char)tmp;
402 spin_lock_irqsave(&event_lock, flags);
403 SET_PORT_BITS(TLCLK_REG3, 0xbf, val << 6);
404 spin_unlock_irqrestore(&event_lock, flags);
405
406 return strnlen(buf, count);
407 }
408
409 static DEVICE_ATTR(enable_clk3a_output, (S_IWUSR|S_IWGRP), NULL,
410 store_enable_clk3a_output);
411
store_enable_clkb1_output(struct device * d,struct device_attribute * attr,const char * buf,size_t count)412 static ssize_t store_enable_clkb1_output(struct device *d,
413 struct device_attribute *attr, const char *buf, size_t count)
414 {
415 unsigned long flags;
416 unsigned long tmp;
417 unsigned char val;
418
419 sscanf(buf, "%lX", &tmp);
420 dev_dbg(d, "tmp = 0x%lX\n", tmp);
421
422 val = (unsigned char)tmp;
423 spin_lock_irqsave(&event_lock, flags);
424 SET_PORT_BITS(TLCLK_REG2, 0xf7, val << 3);
425 spin_unlock_irqrestore(&event_lock, flags);
426
427 return strnlen(buf, count);
428 }
429
430 static DEVICE_ATTR(enable_clkb1_output, (S_IWUSR|S_IWGRP), NULL,
431 store_enable_clkb1_output);
432
433
store_enable_clka1_output(struct device * d,struct device_attribute * attr,const char * buf,size_t count)434 static ssize_t store_enable_clka1_output(struct device *d,
435 struct device_attribute *attr, const char *buf, size_t count)
436 {
437 unsigned long flags;
438 unsigned long tmp;
439 unsigned char val;
440
441 sscanf(buf, "%lX", &tmp);
442 dev_dbg(d, "tmp = 0x%lX\n", tmp);
443
444 val = (unsigned char)tmp;
445 spin_lock_irqsave(&event_lock, flags);
446 SET_PORT_BITS(TLCLK_REG2, 0xfb, val << 2);
447 spin_unlock_irqrestore(&event_lock, flags);
448
449 return strnlen(buf, count);
450 }
451
452 static DEVICE_ATTR(enable_clka1_output, (S_IWUSR|S_IWGRP), NULL,
453 store_enable_clka1_output);
454
store_enable_clkb0_output(struct device * d,struct device_attribute * attr,const char * buf,size_t count)455 static ssize_t store_enable_clkb0_output(struct device *d,
456 struct device_attribute *attr, const char *buf, size_t count)
457 {
458 unsigned long flags;
459 unsigned long tmp;
460 unsigned char val;
461
462 sscanf(buf, "%lX", &tmp);
463 dev_dbg(d, "tmp = 0x%lX\n", tmp);
464
465 val = (unsigned char)tmp;
466 spin_lock_irqsave(&event_lock, flags);
467 SET_PORT_BITS(TLCLK_REG2, 0xfd, val << 1);
468 spin_unlock_irqrestore(&event_lock, flags);
469
470 return strnlen(buf, count);
471 }
472
473 static DEVICE_ATTR(enable_clkb0_output, (S_IWUSR|S_IWGRP), NULL,
474 store_enable_clkb0_output);
475
store_enable_clka0_output(struct device * d,struct device_attribute * attr,const char * buf,size_t count)476 static ssize_t store_enable_clka0_output(struct device *d,
477 struct device_attribute *attr, const char *buf, size_t count)
478 {
479 unsigned long flags;
480 unsigned long tmp;
481 unsigned char val;
482
483 sscanf(buf, "%lX", &tmp);
484 dev_dbg(d, "tmp = 0x%lX\n", tmp);
485
486 val = (unsigned char)tmp;
487 spin_lock_irqsave(&event_lock, flags);
488 SET_PORT_BITS(TLCLK_REG2, 0xfe, val);
489 spin_unlock_irqrestore(&event_lock, flags);
490
491 return strnlen(buf, count);
492 }
493
494 static DEVICE_ATTR(enable_clka0_output, (S_IWUSR|S_IWGRP), NULL,
495 store_enable_clka0_output);
496
store_select_amcb2_transmit_clock(struct device * d,struct device_attribute * attr,const char * buf,size_t count)497 static ssize_t store_select_amcb2_transmit_clock(struct device *d,
498 struct device_attribute *attr, const char *buf, size_t count)
499 {
500 unsigned long flags;
501 unsigned long tmp;
502 unsigned char val;
503
504 sscanf(buf, "%lX", &tmp);
505 dev_dbg(d, "tmp = 0x%lX\n", tmp);
506
507 val = (unsigned char)tmp;
508 spin_lock_irqsave(&event_lock, flags);
509 if ((val == CLK_8kHz) || (val == CLK_16_384MHz)) {
510 SET_PORT_BITS(TLCLK_REG3, 0xc7, 0x28);
511 SET_PORT_BITS(TLCLK_REG1, 0xfb, ~val);
512 } else if (val >= CLK_8_592MHz) {
513 SET_PORT_BITS(TLCLK_REG3, 0xc7, 0x38);
514 switch (val) {
515 case CLK_8_592MHz:
516 SET_PORT_BITS(TLCLK_REG0, 0xfc, 2);
517 break;
518 case CLK_11_184MHz:
519 SET_PORT_BITS(TLCLK_REG0, 0xfc, 0);
520 break;
521 case CLK_34_368MHz:
522 SET_PORT_BITS(TLCLK_REG0, 0xfc, 3);
523 break;
524 case CLK_44_736MHz:
525 SET_PORT_BITS(TLCLK_REG0, 0xfc, 1);
526 break;
527 }
528 } else {
529 SET_PORT_BITS(TLCLK_REG3, 0xc7, val << 3);
530 }
531 spin_unlock_irqrestore(&event_lock, flags);
532
533 return strnlen(buf, count);
534 }
535
536 static DEVICE_ATTR(select_amcb2_transmit_clock, (S_IWUSR|S_IWGRP), NULL,
537 store_select_amcb2_transmit_clock);
538
store_select_amcb1_transmit_clock(struct device * d,struct device_attribute * attr,const char * buf,size_t count)539 static ssize_t store_select_amcb1_transmit_clock(struct device *d,
540 struct device_attribute *attr, const char *buf, size_t count)
541 {
542 unsigned long tmp;
543 unsigned char val;
544 unsigned long flags;
545
546 sscanf(buf, "%lX", &tmp);
547 dev_dbg(d, "tmp = 0x%lX\n", tmp);
548
549 val = (unsigned char)tmp;
550 spin_lock_irqsave(&event_lock, flags);
551 if ((val == CLK_8kHz) || (val == CLK_16_384MHz)) {
552 SET_PORT_BITS(TLCLK_REG3, 0xf8, 0x5);
553 SET_PORT_BITS(TLCLK_REG1, 0xfb, ~val);
554 } else if (val >= CLK_8_592MHz) {
555 SET_PORT_BITS(TLCLK_REG3, 0xf8, 0x7);
556 switch (val) {
557 case CLK_8_592MHz:
558 SET_PORT_BITS(TLCLK_REG0, 0xfc, 2);
559 break;
560 case CLK_11_184MHz:
561 SET_PORT_BITS(TLCLK_REG0, 0xfc, 0);
562 break;
563 case CLK_34_368MHz:
564 SET_PORT_BITS(TLCLK_REG0, 0xfc, 3);
565 break;
566 case CLK_44_736MHz:
567 SET_PORT_BITS(TLCLK_REG0, 0xfc, 1);
568 break;
569 }
570 } else {
571 SET_PORT_BITS(TLCLK_REG3, 0xf8, val);
572 }
573 spin_unlock_irqrestore(&event_lock, flags);
574
575 return strnlen(buf, count);
576 }
577
578 static DEVICE_ATTR(select_amcb1_transmit_clock, (S_IWUSR|S_IWGRP), NULL,
579 store_select_amcb1_transmit_clock);
580
store_select_redundant_clock(struct device * d,struct device_attribute * attr,const char * buf,size_t count)581 static ssize_t store_select_redundant_clock(struct device *d,
582 struct device_attribute *attr, const char *buf, size_t count)
583 {
584 unsigned long tmp;
585 unsigned char val;
586 unsigned long flags;
587
588 sscanf(buf, "%lX", &tmp);
589 dev_dbg(d, "tmp = 0x%lX\n", tmp);
590
591 val = (unsigned char)tmp;
592 spin_lock_irqsave(&event_lock, flags);
593 SET_PORT_BITS(TLCLK_REG1, 0xfe, val);
594 spin_unlock_irqrestore(&event_lock, flags);
595
596 return strnlen(buf, count);
597 }
598
599 static DEVICE_ATTR(select_redundant_clock, (S_IWUSR|S_IWGRP), NULL,
600 store_select_redundant_clock);
601
store_select_ref_frequency(struct device * d,struct device_attribute * attr,const char * buf,size_t count)602 static ssize_t store_select_ref_frequency(struct device *d,
603 struct device_attribute *attr, const char *buf, size_t count)
604 {
605 unsigned long tmp;
606 unsigned char val;
607 unsigned long flags;
608
609 sscanf(buf, "%lX", &tmp);
610 dev_dbg(d, "tmp = 0x%lX\n", tmp);
611
612 val = (unsigned char)tmp;
613 spin_lock_irqsave(&event_lock, flags);
614 SET_PORT_BITS(TLCLK_REG1, 0xfd, val);
615 spin_unlock_irqrestore(&event_lock, flags);
616
617 return strnlen(buf, count);
618 }
619
620 static DEVICE_ATTR(select_ref_frequency, (S_IWUSR|S_IWGRP), NULL,
621 store_select_ref_frequency);
622
store_filter_select(struct device * d,struct device_attribute * attr,const char * buf,size_t count)623 static ssize_t store_filter_select(struct device *d,
624 struct device_attribute *attr, const char *buf, size_t count)
625 {
626 unsigned long tmp;
627 unsigned char val;
628 unsigned long flags;
629
630 sscanf(buf, "%lX", &tmp);
631 dev_dbg(d, "tmp = 0x%lX\n", tmp);
632
633 val = (unsigned char)tmp;
634 spin_lock_irqsave(&event_lock, flags);
635 SET_PORT_BITS(TLCLK_REG0, 0xfb, val);
636 spin_unlock_irqrestore(&event_lock, flags);
637
638 return strnlen(buf, count);
639 }
640
641 static DEVICE_ATTR(filter_select, (S_IWUSR|S_IWGRP), NULL, store_filter_select);
642
store_hardware_switching_mode(struct device * d,struct device_attribute * attr,const char * buf,size_t count)643 static ssize_t store_hardware_switching_mode(struct device *d,
644 struct device_attribute *attr, const char *buf, size_t count)
645 {
646 unsigned long tmp;
647 unsigned char val;
648 unsigned long flags;
649
650 sscanf(buf, "%lX", &tmp);
651 dev_dbg(d, "tmp = 0x%lX\n", tmp);
652
653 val = (unsigned char)tmp;
654 spin_lock_irqsave(&event_lock, flags);
655 SET_PORT_BITS(TLCLK_REG0, 0xbf, val);
656 spin_unlock_irqrestore(&event_lock, flags);
657
658 return strnlen(buf, count);
659 }
660
661 static DEVICE_ATTR(hardware_switching_mode, (S_IWUSR|S_IWGRP), NULL,
662 store_hardware_switching_mode);
663
store_hardware_switching(struct device * d,struct device_attribute * attr,const char * buf,size_t count)664 static ssize_t store_hardware_switching(struct device *d,
665 struct device_attribute *attr, const char *buf, size_t count)
666 {
667 unsigned long tmp;
668 unsigned char val;
669 unsigned long flags;
670
671 sscanf(buf, "%lX", &tmp);
672 dev_dbg(d, "tmp = 0x%lX\n", tmp);
673
674 val = (unsigned char)tmp;
675 spin_lock_irqsave(&event_lock, flags);
676 SET_PORT_BITS(TLCLK_REG0, 0x7f, val);
677 spin_unlock_irqrestore(&event_lock, flags);
678
679 return strnlen(buf, count);
680 }
681
682 static DEVICE_ATTR(hardware_switching, (S_IWUSR|S_IWGRP), NULL,
683 store_hardware_switching);
684
store_refalign(struct device * d,struct device_attribute * attr,const char * buf,size_t count)685 static ssize_t store_refalign (struct device *d,
686 struct device_attribute *attr, const char *buf, size_t count)
687 {
688 unsigned long tmp;
689 unsigned long flags;
690
691 sscanf(buf, "%lX", &tmp);
692 dev_dbg(d, "tmp = 0x%lX\n", tmp);
693 spin_lock_irqsave(&event_lock, flags);
694 SET_PORT_BITS(TLCLK_REG0, 0xf7, 0);
695 SET_PORT_BITS(TLCLK_REG0, 0xf7, 0x08);
696 SET_PORT_BITS(TLCLK_REG0, 0xf7, 0);
697 spin_unlock_irqrestore(&event_lock, flags);
698
699 return strnlen(buf, count);
700 }
701
702 static DEVICE_ATTR(refalign, (S_IWUSR|S_IWGRP), NULL, store_refalign);
703
store_mode_select(struct device * d,struct device_attribute * attr,const char * buf,size_t count)704 static ssize_t store_mode_select (struct device *d,
705 struct device_attribute *attr, const char *buf, size_t count)
706 {
707 unsigned long tmp;
708 unsigned char val;
709 unsigned long flags;
710
711 sscanf(buf, "%lX", &tmp);
712 dev_dbg(d, "tmp = 0x%lX\n", tmp);
713
714 val = (unsigned char)tmp;
715 spin_lock_irqsave(&event_lock, flags);
716 SET_PORT_BITS(TLCLK_REG0, 0xcf, val);
717 spin_unlock_irqrestore(&event_lock, flags);
718
719 return strnlen(buf, count);
720 }
721
722 static DEVICE_ATTR(mode_select, (S_IWUSR|S_IWGRP), NULL, store_mode_select);
723
store_reset(struct device * d,struct device_attribute * attr,const char * buf,size_t count)724 static ssize_t store_reset (struct device *d,
725 struct device_attribute *attr, const char *buf, size_t count)
726 {
727 unsigned long tmp;
728 unsigned char val;
729 unsigned long flags;
730
731 sscanf(buf, "%lX", &tmp);
732 dev_dbg(d, "tmp = 0x%lX\n", tmp);
733
734 val = (unsigned char)tmp;
735 spin_lock_irqsave(&event_lock, flags);
736 SET_PORT_BITS(TLCLK_REG4, 0xfd, val);
737 spin_unlock_irqrestore(&event_lock, flags);
738
739 return strnlen(buf, count);
740 }
741
742 static DEVICE_ATTR(reset, (S_IWUSR|S_IWGRP), NULL, store_reset);
743
744 static struct attribute *tlclk_sysfs_entries[] = {
745 &dev_attr_current_ref.attr,
746 &dev_attr_telclock_version.attr,
747 &dev_attr_alarms.attr,
748 &dev_attr_received_ref_clk3a.attr,
749 &dev_attr_received_ref_clk3b.attr,
750 &dev_attr_enable_clk3a_output.attr,
751 &dev_attr_enable_clk3b_output.attr,
752 &dev_attr_enable_clkb1_output.attr,
753 &dev_attr_enable_clka1_output.attr,
754 &dev_attr_enable_clkb0_output.attr,
755 &dev_attr_enable_clka0_output.attr,
756 &dev_attr_select_amcb1_transmit_clock.attr,
757 &dev_attr_select_amcb2_transmit_clock.attr,
758 &dev_attr_select_redundant_clock.attr,
759 &dev_attr_select_ref_frequency.attr,
760 &dev_attr_filter_select.attr,
761 &dev_attr_hardware_switching_mode.attr,
762 &dev_attr_hardware_switching.attr,
763 &dev_attr_refalign.attr,
764 &dev_attr_mode_select.attr,
765 &dev_attr_reset.attr,
766 NULL
767 };
768
769 static const struct attribute_group tlclk_attribute_group = {
770 .name = NULL, /* put in device directory */
771 .attrs = tlclk_sysfs_entries,
772 };
773
774 static struct platform_device *tlclk_device;
775
tlclk_init(void)776 static int __init tlclk_init(void)
777 {
778 int ret;
779
780 telclk_interrupt = (inb(TLCLK_REG7) & 0x0f);
781
782 alarm_events = kzalloc( sizeof(struct tlclk_alarms), GFP_KERNEL);
783 if (!alarm_events) {
784 ret = -ENOMEM;
785 goto out1;
786 }
787
788 ret = register_chrdev(tlclk_major, "telco_clock", &tlclk_fops);
789 if (ret < 0) {
790 printk(KERN_ERR "tlclk: can't get major %d.\n", tlclk_major);
791 kfree(alarm_events);
792 return ret;
793 }
794 tlclk_major = ret;
795
796 /* Read telecom clock IRQ number (Set by BIOS) */
797 if (!request_region(TLCLK_BASE, 8, "telco_clock")) {
798 printk(KERN_ERR "tlclk: request_region 0x%X failed.\n",
799 TLCLK_BASE);
800 ret = -EBUSY;
801 goto out2;
802 }
803
804 if (0x0F == telclk_interrupt ) { /* not MCPBL0010 ? */
805 printk(KERN_ERR "telclk_interrupt = 0x%x non-mcpbl0010 hw.\n",
806 telclk_interrupt);
807 ret = -ENXIO;
808 goto out3;
809 }
810
811 timer_setup(&switchover_timer, switchover_timeout, 0);
812
813 ret = misc_register(&tlclk_miscdev);
814 if (ret < 0) {
815 printk(KERN_ERR "tlclk: misc_register returns %d.\n", ret);
816 goto out3;
817 }
818
819 tlclk_device = platform_device_register_simple("telco_clock",
820 -1, NULL, 0);
821 if (IS_ERR(tlclk_device)) {
822 printk(KERN_ERR "tlclk: platform_device_register failed.\n");
823 ret = PTR_ERR(tlclk_device);
824 goto out4;
825 }
826
827 ret = sysfs_create_group(&tlclk_device->dev.kobj,
828 &tlclk_attribute_group);
829 if (ret) {
830 printk(KERN_ERR "tlclk: failed to create sysfs device attributes.\n");
831 goto out5;
832 }
833
834 return 0;
835 out5:
836 platform_device_unregister(tlclk_device);
837 out4:
838 misc_deregister(&tlclk_miscdev);
839 out3:
840 release_region(TLCLK_BASE, 8);
841 out2:
842 kfree(alarm_events);
843 unregister_chrdev(tlclk_major, "telco_clock");
844 out1:
845 return ret;
846 }
847
tlclk_cleanup(void)848 static void __exit tlclk_cleanup(void)
849 {
850 sysfs_remove_group(&tlclk_device->dev.kobj, &tlclk_attribute_group);
851 platform_device_unregister(tlclk_device);
852 misc_deregister(&tlclk_miscdev);
853 unregister_chrdev(tlclk_major, "telco_clock");
854
855 release_region(TLCLK_BASE, 8);
856 del_timer_sync(&switchover_timer);
857 kfree(alarm_events);
858
859 }
860
switchover_timeout(struct timer_list * unused)861 static void switchover_timeout(struct timer_list *unused)
862 {
863 unsigned long flags = tlclk_timer_data;
864
865 if ((flags & 1)) {
866 if ((inb(TLCLK_REG1) & 0x08) != (flags & 0x08))
867 alarm_events->switchover_primary++;
868 } else {
869 if ((inb(TLCLK_REG1) & 0x08) != (flags & 0x08))
870 alarm_events->switchover_secondary++;
871 }
872
873 /* Alarm processing is done, wake up read task */
874 del_timer(&switchover_timer);
875 got_event = 1;
876 wake_up(&wq);
877 }
878
tlclk_interrupt(int irq,void * dev_id)879 static irqreturn_t tlclk_interrupt(int irq, void *dev_id)
880 {
881 unsigned long flags;
882
883 spin_lock_irqsave(&event_lock, flags);
884 /* Read and clear interrupt events */
885 int_events = inb(TLCLK_REG6);
886
887 /* Primary_Los changed from 0 to 1 ? */
888 if (int_events & PRI_LOS_01_MASK) {
889 if (inb(TLCLK_REG2) & SEC_LOST_MASK)
890 alarm_events->lost_clocks++;
891 else
892 alarm_events->lost_primary_clock++;
893 }
894
895 /* Primary_Los changed from 1 to 0 ? */
896 if (int_events & PRI_LOS_10_MASK) {
897 alarm_events->primary_clock_back++;
898 SET_PORT_BITS(TLCLK_REG1, 0xFE, 1);
899 }
900 /* Secondary_Los changed from 0 to 1 ? */
901 if (int_events & SEC_LOS_01_MASK) {
902 if (inb(TLCLK_REG2) & PRI_LOST_MASK)
903 alarm_events->lost_clocks++;
904 else
905 alarm_events->lost_secondary_clock++;
906 }
907 /* Secondary_Los changed from 1 to 0 ? */
908 if (int_events & SEC_LOS_10_MASK) {
909 alarm_events->secondary_clock_back++;
910 SET_PORT_BITS(TLCLK_REG1, 0xFE, 0);
911 }
912 if (int_events & HOLDOVER_10_MASK)
913 alarm_events->pll_end_holdover++;
914
915 if (int_events & UNLOCK_01_MASK)
916 alarm_events->pll_lost_sync++;
917
918 if (int_events & UNLOCK_10_MASK)
919 alarm_events->pll_sync++;
920
921 /* Holdover changed from 0 to 1 ? */
922 if (int_events & HOLDOVER_01_MASK) {
923 alarm_events->pll_holdover++;
924
925 /* TIMEOUT in ~10ms */
926 switchover_timer.expires = jiffies + msecs_to_jiffies(10);
927 tlclk_timer_data = inb(TLCLK_REG1);
928 mod_timer(&switchover_timer, switchover_timer.expires);
929 } else {
930 got_event = 1;
931 wake_up(&wq);
932 }
933 spin_unlock_irqrestore(&event_lock, flags);
934
935 return IRQ_HANDLED;
936 }
937
938 module_init(tlclk_init);
939 module_exit(tlclk_cleanup);
940