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