blob: 0c964cdcc223ca7e710534470ee069d75497b802 [file] [log] [blame]
Mark Gross1a80ba82005-10-30 15:02:55 -08001/*
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
Mark Gross1a80ba82005-10-30 15:02:55 -080030#include <linux/module.h>
31#include <linux/init.h>
Mark Gross1a80ba82005-10-30 15:02:55 -080032#include <linux/kernel.h> /* printk() */
33#include <linux/fs.h> /* everything... */
34#include <linux/errno.h> /* error codes */
Alexey Dobriyand43c36d2009-10-07 17:09:06 +040035#include <linux/sched.h>
Mark Gross1a80ba82005-10-30 15:02:55 -080036#include <linux/slab.h>
37#include <linux/ioport.h>
38#include <linux/interrupt.h>
39#include <linux/spinlock.h>
Arnd Bergmannefbec1c2010-09-11 19:31:43 +020040#include <linux/mutex.h>
Mark Gross1a80ba82005-10-30 15:02:55 -080041#include <linux/timer.h>
42#include <linux/sysfs.h>
43#include <linux/device.h>
44#include <linux/miscdevice.h>
Andrew Mortonce463372005-10-31 23:44:30 -080045#include <linux/platform_device.h>
Mark Gross1a80ba82005-10-30 15:02:55 -080046#include <asm/io.h> /* inb/outb */
47#include <asm/uaccess.h>
48
49MODULE_AUTHOR("Sebastien Bouchard <sebastien.bouchard@ca.kontron.com>");
50MODULE_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
121struct 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:
151Upon loading the driver will create a sysfs directory under
152/sys/devices/platform/telco_clock.
153
154This directory exports the following interfaces. There operation is
155documented in the MCPBL0010 TPS under the Telecom Clock API section, 11.4.
156alarms :
157current_ref :
mark gross648bf4f2006-01-15 17:37:30 -0800158received_ref_clk3a :
159received_ref_clk3b :
Mark Gross1a80ba82005-10-30 15:02:55 -0800160enable_clk3a_output :
161enable_clk3b_output :
162enable_clka0_output :
163enable_clka1_output :
164enable_clkb0_output :
165enable_clkb1_output :
166filter_select :
167hardware_switching :
168hardware_switching_mode :
mark gross648bf4f2006-01-15 17:37:30 -0800169telclock_version :
Mark Gross1a80ba82005-10-30 15:02:55 -0800170mode_select :
171refalign :
172reset :
173select_amcb1_transmit_clock :
174select_amcb2_transmit_clock :
175select_redundant_clock :
176select_ref_frequency :
Mark Gross1a80ba82005-10-30 15:02:55 -0800177
178All sysfs interfaces are integers in hex format, i.e echo 99 > refalign
179has the same effect as echo 0x99 > refalign.
180*/
181
182static unsigned int telclk_interrupt;
183
184static int int_events; /* Event that generate a interrupt */
185static int got_event; /* if events processing have been done */
186
187static void switchover_timeout(unsigned long data);
188static struct timer_list switchover_timer =
189 TIMER_INITIALIZER(switchover_timeout , 0, 0);
Mark Gross79603a32007-01-22 20:40:44 -0800190static unsigned long tlclk_timer_data;
Mark Gross1a80ba82005-10-30 15:02:55 -0800191
192static struct tlclk_alarms *alarm_events;
193
194static DEFINE_SPINLOCK(event_lock);
195
196static int tlclk_major = TLCLK_MAJOR;
197
David Howells7d12e782006-10-05 14:55:46 +0100198static irqreturn_t tlclk_interrupt(int irq, void *dev_id);
Mark Gross1a80ba82005-10-30 15:02:55 -0800199
200static DECLARE_WAIT_QUEUE_HEAD(wq);
201
Mark Gross79603a32007-01-22 20:40:44 -0800202static unsigned long useflags;
203static DEFINE_MUTEX(tlclk_mutex);
204
Mark Gross1a80ba82005-10-30 15:02:55 -0800205static int tlclk_open(struct inode *inode, struct file *filp)
206{
207 int result;
208
Arnd Bergmannefbec1c2010-09-11 19:31:43 +0200209 mutex_lock(&tlclk_mutex);
Jonathan Corbetb8c71d7a2008-05-16 13:53:00 -0600210 if (test_and_set_bit(0, &useflags)) {
211 result = -EBUSY;
Mark Gross79603a32007-01-22 20:40:44 -0800212 /* this legacy device is always one per system and it doesn't
213 * know how to handle multiple concurrent clients.
214 */
Jonathan Corbetb8c71d7a2008-05-16 13:53:00 -0600215 goto out;
216 }
Mark Gross79603a32007-01-22 20:40:44 -0800217
Mark Gross1a80ba82005-10-30 15:02:55 -0800218 /* 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,
Thomas Gleixner0f2ed4c2006-07-01 19:29:33 -0700225 IRQF_DISABLED, "telco_clock", tlclk_interrupt);
Jonathan Corbetb8c71d7a2008-05-16 13:53:00 -0600226 if (result == -EBUSY)
Alan Cox4ab24952006-01-11 12:17:33 -0800227 printk(KERN_ERR "tlclk: Interrupt can't be reserved.\n");
Jonathan Corbetb8c71d7a2008-05-16 13:53:00 -0600228 else
229 inb(TLCLK_REG6); /* Clear interrupt events */
Mark Gross1a80ba82005-10-30 15:02:55 -0800230
Jonathan Corbetb8c71d7a2008-05-16 13:53:00 -0600231out:
Arnd Bergmannefbec1c2010-09-11 19:31:43 +0200232 mutex_unlock(&tlclk_mutex);
Jonathan Corbetb8c71d7a2008-05-16 13:53:00 -0600233 return result;
Mark Gross1a80ba82005-10-30 15:02:55 -0800234}
235
236static int tlclk_release(struct inode *inode, struct file *filp)
237{
238 free_irq(telclk_interrupt, tlclk_interrupt);
Mark Gross79603a32007-01-22 20:40:44 -0800239 clear_bit(0, &useflags);
Mark Gross1a80ba82005-10-30 15:02:55 -0800240
241 return 0;
242}
243
mark gross648bf4f2006-01-15 17:37:30 -0800244static ssize_t tlclk_read(struct file *filp, char __user *buf, size_t count,
Mark Gross1a80ba82005-10-30 15:02:55 -0800245 loff_t *f_pos)
246{
247 if (count < sizeof(struct tlclk_alarms))
248 return -EIO;
Mark Gross79603a32007-01-22 20:40:44 -0800249 if (mutex_lock_interruptible(&tlclk_mutex))
250 return -EINTR;
251
Mark Gross1a80ba82005-10-30 15:02:55 -0800252
253 wait_event_interruptible(wq, got_event);
Mark Gross79603a32007-01-22 20:40:44 -0800254 if (copy_to_user(buf, alarm_events, sizeof(struct tlclk_alarms))) {
255 mutex_unlock(&tlclk_mutex);
Mark Gross1a80ba82005-10-30 15:02:55 -0800256 return -EFAULT;
Mark Gross79603a32007-01-22 20:40:44 -0800257 }
Mark Gross1a80ba82005-10-30 15:02:55 -0800258
259 memset(alarm_events, 0, sizeof(struct tlclk_alarms));
260 got_event = 0;
261
Mark Gross79603a32007-01-22 20:40:44 -0800262 mutex_unlock(&tlclk_mutex);
Mark Gross1a80ba82005-10-30 15:02:55 -0800263 return sizeof(struct tlclk_alarms);
264}
265
Arjan van de Ven62322d22006-07-03 00:24:21 -0700266static const struct file_operations tlclk_fops = {
Mark Gross1a80ba82005-10-30 15:02:55 -0800267 .read = tlclk_read,
Mark Gross1a80ba82005-10-30 15:02:55 -0800268 .open = tlclk_open,
269 .release = tlclk_release,
Arnd Bergmann6038f372010-08-15 18:52:59 +0200270 .llseek = noop_llseek,
Mark Gross1a80ba82005-10-30 15:02:55 -0800271
272};
273
274static struct miscdevice tlclk_miscdev = {
275 .minor = MISC_DYNAMIC_MINOR,
276 .name = "telco_clock",
277 .fops = &tlclk_fops,
278};
279
280static 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
293static DEVICE_ATTR(current_ref, S_IRUGO, show_current_ref, NULL);
294
295
mark gross648bf4f2006-01-15 17:37:30 -0800296static ssize_t show_telclock_version(struct device *d,
Mark Gross1a80ba82005-10-30 15:02:55 -0800297 struct device_attribute *attr, char *buf)
298{
299 unsigned long ret_val;
300 unsigned long flags;
301
302 spin_lock_irqsave(&event_lock, flags);
mark gross648bf4f2006-01-15 17:37:30 -0800303 ret_val = inb(TLCLK_REG5);
Mark Gross1a80ba82005-10-30 15:02:55 -0800304 spin_unlock_irqrestore(&event_lock, flags);
305
306 return sprintf(buf, "0x%lX\n", ret_val);
307}
308
mark gross648bf4f2006-01-15 17:37:30 -0800309static DEVICE_ATTR(telclock_version, S_IRUGO,
310 show_telclock_version, NULL);
Mark Gross1a80ba82005-10-30 15:02:55 -0800311
312static 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
325static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
326
mark gross648bf4f2006-01-15 17:37:30 -0800327static 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
Mark Bellon31cc48b2006-04-10 22:54:20 -0700345static DEVICE_ATTR(received_ref_clk3a, (S_IWUSR|S_IWGRP), NULL,
mark gross648bf4f2006-01-15 17:37:30 -0800346 store_received_ref_clk3a);
347
348
349static 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);
mark grossa09ab7e2006-06-23 15:13:07 -0700361 SET_PORT_BITS(TLCLK_REG1, 0xdf, val << 1);
mark gross648bf4f2006-01-15 17:37:30 -0800362 spin_unlock_irqrestore(&event_lock, flags);
363
364 return strnlen(buf, count);
365}
366
Mark Bellon31cc48b2006-04-10 22:54:20 -0700367static DEVICE_ATTR(received_ref_clk3b, (S_IWUSR|S_IWGRP), NULL,
mark gross648bf4f2006-01-15 17:37:30 -0800368 store_received_ref_clk3b);
369
370
Mark Gross1a80ba82005-10-30 15:02:55 -0800371static 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
Mark Bellon31cc48b2006-04-10 22:54:20 -0700389static DEVICE_ATTR(enable_clk3b_output, (S_IWUSR|S_IWGRP), NULL,
Mark Gross1a80ba82005-10-30 15:02:55 -0800390 store_enable_clk3b_output);
391
392static 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
Mark Bellon31cc48b2006-04-10 22:54:20 -0700410static DEVICE_ATTR(enable_clk3a_output, (S_IWUSR|S_IWGRP), NULL,
Mark Gross1a80ba82005-10-30 15:02:55 -0800411 store_enable_clk3a_output);
412
413static 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
Mark Bellon31cc48b2006-04-10 22:54:20 -0700431static DEVICE_ATTR(enable_clkb1_output, (S_IWUSR|S_IWGRP), NULL,
Mark Gross1a80ba82005-10-30 15:02:55 -0800432 store_enable_clkb1_output);
433
434
435static 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
Mark Bellon31cc48b2006-04-10 22:54:20 -0700453static DEVICE_ATTR(enable_clka1_output, (S_IWUSR|S_IWGRP), NULL,
Mark Gross1a80ba82005-10-30 15:02:55 -0800454 store_enable_clka1_output);
455
456static 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
Mark Bellon31cc48b2006-04-10 22:54:20 -0700474static DEVICE_ATTR(enable_clkb0_output, (S_IWUSR|S_IWGRP), NULL,
Mark Gross1a80ba82005-10-30 15:02:55 -0800475 store_enable_clkb0_output);
476
477static 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
Mark Bellon31cc48b2006-04-10 22:54:20 -0700495static DEVICE_ATTR(enable_clka0_output, (S_IWUSR|S_IWGRP), NULL,
Mark Gross1a80ba82005-10-30 15:02:55 -0800496 store_enable_clka0_output);
497
Mark Gross1a80ba82005-10-30 15:02:55 -0800498static 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:
mark gross648bf4f2006-01-15 17:37:30 -0800517 SET_PORT_BITS(TLCLK_REG0, 0xfc, 2);
Mark Gross1a80ba82005-10-30 15:02:55 -0800518 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:
mark gross648bf4f2006-01-15 17:37:30 -0800526 SET_PORT_BITS(TLCLK_REG0, 0xfc, 1);
Mark Gross1a80ba82005-10-30 15:02:55 -0800527 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
Mark Bellon31cc48b2006-04-10 22:54:20 -0700537static DEVICE_ATTR(select_amcb2_transmit_clock, (S_IWUSR|S_IWGRP), NULL,
Mark Gross1a80ba82005-10-30 15:02:55 -0800538 store_select_amcb2_transmit_clock);
539
540static 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:
Mark Gross79603a32007-01-22 20:40:44 -0800559 SET_PORT_BITS(TLCLK_REG0, 0xfc, 2);
Mark Gross1a80ba82005-10-30 15:02:55 -0800560 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:
Mark Gross79603a32007-01-22 20:40:44 -0800568 SET_PORT_BITS(TLCLK_REG0, 0xfc, 1);
Mark Gross1a80ba82005-10-30 15:02:55 -0800569 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
Mark Bellon31cc48b2006-04-10 22:54:20 -0700578static DEVICE_ATTR(select_amcb1_transmit_clock, (S_IWUSR|S_IWGRP), NULL,
Mark Gross1a80ba82005-10-30 15:02:55 -0800579 store_select_amcb1_transmit_clock);
580
581static 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
Mark Bellon31cc48b2006-04-10 22:54:20 -0700599static DEVICE_ATTR(select_redundant_clock, (S_IWUSR|S_IWGRP), NULL,
Mark Gross1a80ba82005-10-30 15:02:55 -0800600 store_select_redundant_clock);
601
602static 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
Mark Bellon31cc48b2006-04-10 22:54:20 -0700620static DEVICE_ATTR(select_ref_frequency, (S_IWUSR|S_IWGRP), NULL,
Mark Gross1a80ba82005-10-30 15:02:55 -0800621 store_select_ref_frequency);
622
623static 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
Mark Bellon31cc48b2006-04-10 22:54:20 -0700641static DEVICE_ATTR(filter_select, (S_IWUSR|S_IWGRP), NULL, store_filter_select);
Mark Gross1a80ba82005-10-30 15:02:55 -0800642
643static 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
Mark Bellon31cc48b2006-04-10 22:54:20 -0700661static DEVICE_ATTR(hardware_switching_mode, (S_IWUSR|S_IWGRP), NULL,
Mark Gross1a80ba82005-10-30 15:02:55 -0800662 store_hardware_switching_mode);
663
664static 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
Mark Bellon31cc48b2006-04-10 22:54:20 -0700682static DEVICE_ATTR(hardware_switching, (S_IWUSR|S_IWGRP), NULL,
Mark Gross1a80ba82005-10-30 15:02:55 -0800683 store_hardware_switching);
684
685static 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);
Mark Gross1a80ba82005-10-30 15:02:55 -0800695 SET_PORT_BITS(TLCLK_REG0, 0xf7, 0x08);
Mark Gross1a80ba82005-10-30 15:02:55 -0800696 SET_PORT_BITS(TLCLK_REG0, 0xf7, 0);
697 spin_unlock_irqrestore(&event_lock, flags);
698
699 return strnlen(buf, count);
700}
701
Mark Bellon31cc48b2006-04-10 22:54:20 -0700702static DEVICE_ATTR(refalign, (S_IWUSR|S_IWGRP), NULL, store_refalign);
Mark Gross1a80ba82005-10-30 15:02:55 -0800703
704static 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
Mark Bellon31cc48b2006-04-10 22:54:20 -0700722static DEVICE_ATTR(mode_select, (S_IWUSR|S_IWGRP), NULL, store_mode_select);
Mark Gross1a80ba82005-10-30 15:02:55 -0800723
724static 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
Mark Bellon31cc48b2006-04-10 22:54:20 -0700742static DEVICE_ATTR(reset, (S_IWUSR|S_IWGRP), NULL, store_reset);
Mark Gross1a80ba82005-10-30 15:02:55 -0800743
744static struct attribute *tlclk_sysfs_entries[] = {
745 &dev_attr_current_ref.attr,
mark gross648bf4f2006-01-15 17:37:30 -0800746 &dev_attr_telclock_version.attr,
Mark Gross1a80ba82005-10-30 15:02:55 -0800747 &dev_attr_alarms.attr,
mark gross648bf4f2006-01-15 17:37:30 -0800748 &dev_attr_received_ref_clk3a.attr,
749 &dev_attr_received_ref_clk3b.attr,
Mark Gross1a80ba82005-10-30 15:02:55 -0800750 &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,
Mark Gross1a80ba82005-10-30 15:02:55 -0800756 &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
769static struct attribute_group tlclk_attribute_group = {
770 .name = NULL, /* put in device directory */
771 .attrs = tlclk_sysfs_entries,
772};
773
774static struct platform_device *tlclk_device;
775
776static int __init tlclk_init(void)
777{
778 int ret;
779
780 ret = register_chrdev(tlclk_major, "telco_clock", &tlclk_fops);
781 if (ret < 0) {
Alan Cox4ab24952006-01-11 12:17:33 -0800782 printk(KERN_ERR "tlclk: can't get major %d.\n", tlclk_major);
Mark Gross1a80ba82005-10-30 15:02:55 -0800783 return ret;
784 }
Andrew Morton222b9f92006-03-26 01:37:31 -0800785 tlclk_major = ret;
Mark Gross1a80ba82005-10-30 15:02:55 -0800786 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")) {
Alan Cox4ab24952006-01-11 12:17:33 -0800792 printk(KERN_ERR "tlclk: request_region 0x%X failed.\n",
Mark Gross1a80ba82005-10-30 15:02:55 -0800793 TLCLK_BASE);
794 ret = -EBUSY;
795 goto out2;
796 }
797 telclk_interrupt = (inb(TLCLK_REG7) & 0x0f);
798
799 if (0x0F == telclk_interrupt ) { /* not MCPBL0010 ? */
Alan Cox4ab24952006-01-11 12:17:33 -0800800 printk(KERN_ERR "telclk_interrup = 0x%x non-mcpbl0010 hw.\n",
Mark Gross1a80ba82005-10-30 15:02:55 -0800801 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) {
Alan Cox4ab24952006-01-11 12:17:33 -0800810 printk(KERN_ERR "tlclk: misc_register returns %d.\n", ret);
Mark Gross1a80ba82005-10-30 15:02:55 -0800811 goto out3;
812 }
813
814 tlclk_device = platform_device_register_simple("telco_clock",
815 -1, NULL, 0);
Akinobu Mita5e66b0b2006-11-25 11:09:35 -0800816 if (IS_ERR(tlclk_device)) {
Alan Cox4ab24952006-01-11 12:17:33 -0800817 printk(KERN_ERR "tlclk: platform_device_register failed.\n");
Akinobu Mita5e66b0b2006-11-25 11:09:35 -0800818 ret = PTR_ERR(tlclk_device);
Mark Gross1a80ba82005-10-30 15:02:55 -0800819 goto out4;
820 }
821
822 ret = sysfs_create_group(&tlclk_device->dev.kobj,
823 &tlclk_attribute_group);
824 if (ret) {
Alan Cox4ab24952006-01-11 12:17:33 -0800825 printk(KERN_ERR "tlclk: failed to create sysfs device attributes.\n");
Mark Gross1a80ba82005-10-30 15:02:55 -0800826 goto out5;
827 }
828
829 return 0;
830out5:
831 platform_device_unregister(tlclk_device);
832out4:
833 misc_deregister(&tlclk_miscdev);
834out3:
835 release_region(TLCLK_BASE, 8);
836out2:
837 kfree(alarm_events);
838out1:
839 unregister_chrdev(tlclk_major, "telco_clock");
840 return ret;
841}
842
843static 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
856static void switchover_timeout(unsigned long data)
857{
Mark Gross79603a32007-01-22 20:40:44 -0800858 unsigned long flags = *(unsigned long *) data;
859
860 if ((flags & 1)) {
861 if ((inb(TLCLK_REG1) & 0x08) != (flags & 0x08))
Mark Gross1a80ba82005-10-30 15:02:55 -0800862 alarm_events->switchover_primary++;
863 } else {
Mark Gross79603a32007-01-22 20:40:44 -0800864 if ((inb(TLCLK_REG1) & 0x08) != (flags & 0x08))
Mark Gross1a80ba82005-10-30 15:02:55 -0800865 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
David Howells7d12e782006-10-05 14:55:46 +0100874static irqreturn_t tlclk_interrupt(int irq, void *dev_id)
Mark Gross1a80ba82005-10-30 15:02:55 -0800875{
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);
Mark Gross79603a32007-01-22 20:40:44 -0800922 tlclk_timer_data = inb(TLCLK_REG1);
923 switchover_timer.data = (unsigned long) &tlclk_timer_data;
924 mod_timer(&switchover_timer, switchover_timer.expires);
Mark Gross1a80ba82005-10-30 15:02:55 -0800925 } else {
926 got_event = 1;
927 wake_up(&wq);
928 }
929 spin_unlock_irqrestore(&event_lock, flags);
930
931 return IRQ_HANDLED;
932}
933
934module_init(tlclk_init);
935module_exit(tlclk_cleanup);