Merge tag 'cleanup' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
[linux-2.6.git] / drivers / char / tlclk.c
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 <asm/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(unsigned long data);
188 static struct timer_list switchover_timer =
189         TIMER_INITIALIZER(switchover_timeout , 0, 0);
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                              IRQF_DISABLED, "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         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
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
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
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
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
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
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
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
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 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
776 static int __init tlclk_init(void)
777 {
778         int ret;
779
780         ret = register_chrdev(tlclk_major, "telco_clock", &tlclk_fops);
781         if (ret < 0) {
782                 printk(KERN_ERR "tlclk: can't get major %d.\n", tlclk_major);
783                 return ret;
784         }
785         tlclk_major = ret;
786         alarm_events = kzalloc( sizeof(struct tlclk_alarms), GFP_KERNEL);
787         if (!alarm_events)
788                 goto out1;
789
790         /* Read telecom clock IRQ number (Set by BIOS) */
791         if (!request_region(TLCLK_BASE, 8, "telco_clock")) {
792                 printk(KERN_ERR "tlclk: request_region 0x%X failed.\n",
793                         TLCLK_BASE);
794                 ret = -EBUSY;
795                 goto out2;
796         }
797         telclk_interrupt = (inb(TLCLK_REG7) & 0x0f);
798
799         if (0x0F == telclk_interrupt ) { /* not MCPBL0010 ? */
800                 printk(KERN_ERR "telclk_interrupt = 0x%x non-mcpbl0010 hw.\n",
801                         telclk_interrupt);
802                 ret = -ENXIO;
803                 goto out3;
804         }
805
806         init_timer(&switchover_timer);
807
808         ret = misc_register(&tlclk_miscdev);
809         if (ret < 0) {
810                 printk(KERN_ERR "tlclk: misc_register returns %d.\n", ret);
811                 goto out3;
812         }
813
814         tlclk_device = platform_device_register_simple("telco_clock",
815                                 -1, NULL, 0);
816         if (IS_ERR(tlclk_device)) {
817                 printk(KERN_ERR "tlclk: platform_device_register failed.\n");
818                 ret = PTR_ERR(tlclk_device);
819                 goto out4;
820         }
821
822         ret = sysfs_create_group(&tlclk_device->dev.kobj,
823                         &tlclk_attribute_group);
824         if (ret) {
825                 printk(KERN_ERR "tlclk: failed to create sysfs device attributes.\n");
826                 goto out5;
827         }
828
829         return 0;
830 out5:
831         platform_device_unregister(tlclk_device);
832 out4:
833         misc_deregister(&tlclk_miscdev);
834 out3:
835         release_region(TLCLK_BASE, 8);
836 out2:
837         kfree(alarm_events);
838 out1:
839         unregister_chrdev(tlclk_major, "telco_clock");
840         return ret;
841 }
842
843 static void __exit tlclk_cleanup(void)
844 {
845         sysfs_remove_group(&tlclk_device->dev.kobj, &tlclk_attribute_group);
846         platform_device_unregister(tlclk_device);
847         misc_deregister(&tlclk_miscdev);
848         unregister_chrdev(tlclk_major, "telco_clock");
849
850         release_region(TLCLK_BASE, 8);
851         del_timer_sync(&switchover_timer);
852         kfree(alarm_events);
853
854 }
855
856 static void switchover_timeout(unsigned long data)
857 {
858         unsigned long flags = *(unsigned long *) data;
859
860         if ((flags & 1)) {
861                 if ((inb(TLCLK_REG1) & 0x08) != (flags & 0x08))
862                         alarm_events->switchover_primary++;
863         } else {
864                 if ((inb(TLCLK_REG1) & 0x08) != (flags & 0x08))
865                         alarm_events->switchover_secondary++;
866         }
867
868         /* Alarm processing is done, wake up read task */
869         del_timer(&switchover_timer);
870         got_event = 1;
871         wake_up(&wq);
872 }
873
874 static irqreturn_t tlclk_interrupt(int irq, void *dev_id)
875 {
876         unsigned long flags;
877
878         spin_lock_irqsave(&event_lock, flags);
879         /* Read and clear interrupt events */
880         int_events = inb(TLCLK_REG6);
881
882         /* Primary_Los changed from 0 to 1 ? */
883         if (int_events & PRI_LOS_01_MASK) {
884                 if (inb(TLCLK_REG2) & SEC_LOST_MASK)
885                         alarm_events->lost_clocks++;
886                 else
887                         alarm_events->lost_primary_clock++;
888         }
889
890         /* Primary_Los changed from 1 to 0 ? */
891         if (int_events & PRI_LOS_10_MASK) {
892                 alarm_events->primary_clock_back++;
893                 SET_PORT_BITS(TLCLK_REG1, 0xFE, 1);
894         }
895         /* Secondary_Los changed from 0 to 1 ? */
896         if (int_events & SEC_LOS_01_MASK) {
897                 if (inb(TLCLK_REG2) & PRI_LOST_MASK)
898                         alarm_events->lost_clocks++;
899                 else
900                         alarm_events->lost_secondary_clock++;
901         }
902         /* Secondary_Los changed from 1 to 0 ? */
903         if (int_events & SEC_LOS_10_MASK) {
904                 alarm_events->secondary_clock_back++;
905                 SET_PORT_BITS(TLCLK_REG1, 0xFE, 0);
906         }
907         if (int_events & HOLDOVER_10_MASK)
908                 alarm_events->pll_end_holdover++;
909
910         if (int_events & UNLOCK_01_MASK)
911                 alarm_events->pll_lost_sync++;
912
913         if (int_events & UNLOCK_10_MASK)
914                 alarm_events->pll_sync++;
915
916         /* Holdover changed from 0 to 1 ? */
917         if (int_events & HOLDOVER_01_MASK) {
918                 alarm_events->pll_holdover++;
919
920                 /* TIMEOUT in ~10ms */
921                 switchover_timer.expires = jiffies + msecs_to_jiffies(10);
922                 tlclk_timer_data = inb(TLCLK_REG1);
923                 switchover_timer.data = (unsigned long) &tlclk_timer_data;
924                 mod_timer(&switchover_timer, switchover_timer.expires);
925         } else {
926                 got_event = 1;
927                 wake_up(&wq);
928         }
929         spin_unlock_irqrestore(&event_lock, flags);
930
931         return IRQ_HANDLED;
932 }
933
934 module_init(tlclk_init);
935 module_exit(tlclk_cleanup);