2 * Telecom Clock driver for Intel NetStructure(tm) MPCBL0010
4 * Copyright (C) 2005 Kontron Canada
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.
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
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.
23 * Send feedback to <sebastien.bouchard@ca.kontron.com> and the current
24 * Maintainer <mark.gross@intel.com>
26 * Description : This is the TELECOM CLOCK module driver for the ATCA
27 * MPCBL0010 ATCA computer.
30 #include <linux/config.h>
31 #include <linux/module.h>
32 #include <linux/init.h>
33 #include <linux/sched.h>
34 #include <linux/kernel.h> /* printk() */
35 #include <linux/fs.h> /* everything... */
36 #include <linux/errno.h> /* error codes */
37 #include <linux/delay.h> /* udelay */
38 #include <linux/slab.h>
39 #include <linux/ioport.h>
40 #include <linux/interrupt.h>
41 #include <linux/spinlock.h>
42 #include <linux/timer.h>
43 #include <linux/sysfs.h>
44 #include <linux/device.h>
45 #include <linux/miscdevice.h>
46 #include <linux/platform_device.h>
47 #include <asm/io.h> /* inb/outb */
48 #include <asm/uaccess.h>
50 MODULE_AUTHOR("Sebastien Bouchard <sebastien.bouchard@ca.kontron.com>");
51 MODULE_LICENSE("GPL");
53 /*Hardware Reset of the PLL */
55 #define RESET_OFF 0x01
58 #define NORMAL_MODE 0x00
59 #define HOLDOVER_MODE 0x10
60 #define FREERUN_MODE 0x20
63 #define FILTER_6HZ 0x04
64 #define FILTER_12HZ 0x00
66 /* SELECT REFERENCE FREQUENCY */
67 #define REF_CLK1_8kHz 0x00
68 #define REF_CLK2_19_44MHz 0x02
70 /* Select primary or secondary redundant clock */
71 #define PRIMARY_CLOCK 0x00
72 #define SECONDARY_CLOCK 0x01
74 /* CLOCK TRANSMISSION DEFINE */
76 #define CLK_16_384MHz 0xfb
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
85 #define CLK_8_592MHz 0x08
86 #define CLK_11_184MHz 0x09
87 #define CLK_34_368MHz 0x0b
88 #define CLK_44_736MHz 0x0a
90 /* RECEIVED REFERENCE */
94 /* HARDWARE SWITCHING DEFINE */
95 #define HW_ENABLE 0x80
96 #define HW_DISABLE 0x00
98 /* HARDWARE SWITCHING MODE DEFINE */
99 #define PLL_HOLDOVER 0x40
100 #define LOST_CLOCK 0x00
103 #define UNLOCK_MASK 0x10
104 #define HOLDOVER_MASK 0x20
105 #define SEC_LOST_MASK 0x40
106 #define PRI_LOST_MASK 0x80
108 /* INTERRUPT CAUSE DEFINE */
110 #define PRI_LOS_01_MASK 0x01
111 #define PRI_LOS_10_MASK 0x02
113 #define SEC_LOS_01_MASK 0x04
114 #define SEC_LOS_10_MASK 0x08
116 #define HOLDOVER_01_MASK 0x10
117 #define HOLDOVER_10_MASK 0x20
119 #define UNLOCK_01_MASK 0x40
120 #define UNLOCK_10_MASK 0x80
122 struct tlclk_alarms {
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;
131 __u32 pll_end_holdover;
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)
146 #define SET_PORT_BITS(port, mask, val) outb(((inb(port) & mask) | val), port)
148 /* 0 = Dynamic allocation of the major device number */
149 #define TLCLK_MAJOR 0
151 /* sysfs interface definition:
152 Upon loading the driver will create a sysfs directory under
153 /sys/devices/platform/telco_clock.
155 This directory exports the following interfaces. There operation is
156 documented in the MCPBL0010 TPS under the Telecom Clock API section, 11.4.
159 enable_clk3a_output :
160 enable_clk3b_output :
161 enable_clka0_output :
162 enable_clka1_output :
163 enable_clkb0_output :
164 enable_clkb1_output :
167 hardware_switching_mode :
172 select_amcb1_transmit_clock :
173 select_amcb2_transmit_clock :
174 select_redundant_clock :
175 select_ref_frequency :
178 All sysfs interfaces are integers in hex format, i.e echo 99 > refalign
179 has the same effect as echo 0x99 > refalign.
182 static unsigned int telclk_interrupt;
184 static int int_events; /* Event that generate a interrupt */
185 static int got_event; /* if events processing have been done */
187 static void switchover_timeout(unsigned long data);
188 static struct timer_list switchover_timer =
189 TIMER_INITIALIZER(switchover_timeout , 0, 0);
191 static struct tlclk_alarms *alarm_events;
193 static DEFINE_SPINLOCK(event_lock);
195 static int tlclk_major = TLCLK_MAJOR;
197 static irqreturn_t tlclk_interrupt(int irq, void *dev_id, struct pt_regs *regs);
199 static DECLARE_WAIT_QUEUE_HEAD(wq);
201 static int tlclk_open(struct inode *inode, struct file *filp)
205 /* Make sure there is no interrupt pending while
206 * initialising interrupt handler */
209 /* This device is wired through the FPGA IO space of the ATCA blade
210 * we can't share this IRQ */
211 result = request_irq(telclk_interrupt, &tlclk_interrupt,
212 SA_INTERRUPT, "telco_clock", tlclk_interrupt);
213 if (result == -EBUSY) {
214 printk(KERN_ERR "telco_clock: Interrupt can't be reserved!\n");
217 inb(TLCLK_REG6); /* Clear interrupt events */
222 static int tlclk_release(struct inode *inode, struct file *filp)
224 free_irq(telclk_interrupt, tlclk_interrupt);
229 ssize_t tlclk_read(struct file *filp, char __user *buf, size_t count,
232 if (count < sizeof(struct tlclk_alarms))
235 wait_event_interruptible(wq, got_event);
236 if (copy_to_user(buf, alarm_events, sizeof(struct tlclk_alarms)))
239 memset(alarm_events, 0, sizeof(struct tlclk_alarms));
242 return sizeof(struct tlclk_alarms);
245 ssize_t tlclk_write(struct file *filp, const char __user *buf, size_t count,
251 static struct file_operations tlclk_fops = {
253 .write = tlclk_write,
255 .release = tlclk_release,
259 static struct miscdevice tlclk_miscdev = {
260 .minor = MISC_DYNAMIC_MINOR,
261 .name = "telco_clock",
265 static ssize_t show_current_ref(struct device *d,
266 struct device_attribute *attr, char *buf)
268 unsigned long ret_val;
271 spin_lock_irqsave(&event_lock, flags);
272 ret_val = ((inb(TLCLK_REG1) & 0x08) >> 3);
273 spin_unlock_irqrestore(&event_lock, flags);
275 return sprintf(buf, "0x%lX\n", ret_val);
278 static DEVICE_ATTR(current_ref, S_IRUGO, show_current_ref, NULL);
281 static ssize_t show_interrupt_switch(struct device *d,
282 struct device_attribute *attr, char *buf)
284 unsigned long ret_val;
287 spin_lock_irqsave(&event_lock, flags);
288 ret_val = inb(TLCLK_REG6);
289 spin_unlock_irqrestore(&event_lock, flags);
291 return sprintf(buf, "0x%lX\n", ret_val);
294 static DEVICE_ATTR(interrupt_switch, S_IRUGO,
295 show_interrupt_switch, NULL);
297 static ssize_t show_alarms(struct device *d,
298 struct device_attribute *attr, char *buf)
300 unsigned long ret_val;
303 spin_lock_irqsave(&event_lock, flags);
304 ret_val = (inb(TLCLK_REG2) & 0xf0);
305 spin_unlock_irqrestore(&event_lock, flags);
307 return sprintf(buf, "0x%lX\n", ret_val);
310 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
312 static ssize_t store_enable_clk3b_output(struct device *d,
313 struct device_attribute *attr, const char *buf, size_t count)
319 sscanf(buf, "%lX", &tmp);
320 dev_dbg(d, ": tmp = 0x%lX\n", tmp);
322 val = (unsigned char)tmp;
323 spin_lock_irqsave(&event_lock, flags);
324 SET_PORT_BITS(TLCLK_REG3, 0x7f, val << 7);
325 spin_unlock_irqrestore(&event_lock, flags);
327 return strnlen(buf, count);
330 static DEVICE_ATTR(enable_clk3b_output, S_IWUGO, NULL,
331 store_enable_clk3b_output);
333 static ssize_t store_enable_clk3a_output(struct device *d,
334 struct device_attribute *attr, const char *buf, size_t count)
340 sscanf(buf, "%lX", &tmp);
341 dev_dbg(d, "tmp = 0x%lX\n", tmp);
343 val = (unsigned char)tmp;
344 spin_lock_irqsave(&event_lock, flags);
345 SET_PORT_BITS(TLCLK_REG3, 0xbf, val << 6);
346 spin_unlock_irqrestore(&event_lock, flags);
348 return strnlen(buf, count);
351 static DEVICE_ATTR(enable_clk3a_output, S_IWUGO, NULL,
352 store_enable_clk3a_output);
354 static ssize_t store_enable_clkb1_output(struct device *d,
355 struct device_attribute *attr, const char *buf, size_t count)
361 sscanf(buf, "%lX", &tmp);
362 dev_dbg(d, "tmp = 0x%lX\n", tmp);
364 val = (unsigned char)tmp;
365 spin_lock_irqsave(&event_lock, flags);
366 SET_PORT_BITS(TLCLK_REG2, 0xf7, val << 3);
367 spin_unlock_irqrestore(&event_lock, flags);
369 return strnlen(buf, count);
372 static DEVICE_ATTR(enable_clkb1_output, S_IWUGO, NULL,
373 store_enable_clkb1_output);
376 static ssize_t store_enable_clka1_output(struct device *d,
377 struct device_attribute *attr, const char *buf, size_t count)
383 sscanf(buf, "%lX", &tmp);
384 dev_dbg(d, "tmp = 0x%lX\n", tmp);
386 val = (unsigned char)tmp;
387 spin_lock_irqsave(&event_lock, flags);
388 SET_PORT_BITS(TLCLK_REG2, 0xfb, val << 2);
389 spin_unlock_irqrestore(&event_lock, flags);
391 return strnlen(buf, count);
394 static DEVICE_ATTR(enable_clka1_output, S_IWUGO, NULL,
395 store_enable_clka1_output);
397 static ssize_t store_enable_clkb0_output(struct device *d,
398 struct device_attribute *attr, const char *buf, size_t count)
404 sscanf(buf, "%lX", &tmp);
405 dev_dbg(d, "tmp = 0x%lX\n", tmp);
407 val = (unsigned char)tmp;
408 spin_lock_irqsave(&event_lock, flags);
409 SET_PORT_BITS(TLCLK_REG2, 0xfd, val << 1);
410 spin_unlock_irqrestore(&event_lock, flags);
412 return strnlen(buf, count);
415 static DEVICE_ATTR(enable_clkb0_output, S_IWUGO, NULL,
416 store_enable_clkb0_output);
418 static ssize_t store_enable_clka0_output(struct device *d,
419 struct device_attribute *attr, const char *buf, size_t count)
425 sscanf(buf, "%lX", &tmp);
426 dev_dbg(d, "tmp = 0x%lX\n", tmp);
428 val = (unsigned char)tmp;
429 spin_lock_irqsave(&event_lock, flags);
430 SET_PORT_BITS(TLCLK_REG2, 0xfe, val);
431 spin_unlock_irqrestore(&event_lock, flags);
433 return strnlen(buf, count);
436 static DEVICE_ATTR(enable_clka0_output, S_IWUGO, NULL,
437 store_enable_clka0_output);
439 static ssize_t store_test_mode(struct device *d,
440 struct device_attribute *attr, const char *buf, size_t count)
446 sscanf(buf, "%lX", &tmp);
447 dev_dbg(d, "tmp = 0x%lX\n", tmp);
449 val = (unsigned char)tmp;
450 spin_lock_irqsave(&event_lock, flags);
451 SET_PORT_BITS(TLCLK_REG4, 0xfd, 2);
452 spin_unlock_irqrestore(&event_lock, flags);
454 return strnlen(buf, count);
457 static DEVICE_ATTR(test_mode, S_IWUGO, NULL, store_test_mode);
459 static ssize_t store_select_amcb2_transmit_clock(struct device *d,
460 struct device_attribute *attr, const char *buf, size_t count)
466 sscanf(buf, "%lX", &tmp);
467 dev_dbg(d, "tmp = 0x%lX\n", tmp);
469 val = (unsigned char)tmp;
470 spin_lock_irqsave(&event_lock, flags);
471 if ((val == CLK_8kHz) || (val == CLK_16_384MHz)) {
472 SET_PORT_BITS(TLCLK_REG3, 0xc7, 0x28);
473 SET_PORT_BITS(TLCLK_REG1, 0xfb, ~val);
474 } else if (val >= CLK_8_592MHz) {
475 SET_PORT_BITS(TLCLK_REG3, 0xc7, 0x38);
478 SET_PORT_BITS(TLCLK_REG0, 0xfc, 1);
481 SET_PORT_BITS(TLCLK_REG0, 0xfc, 0);
484 SET_PORT_BITS(TLCLK_REG0, 0xfc, 3);
487 SET_PORT_BITS(TLCLK_REG0, 0xfc, 2);
491 SET_PORT_BITS(TLCLK_REG3, 0xc7, val << 3);
493 spin_unlock_irqrestore(&event_lock, flags);
495 return strnlen(buf, count);
498 static DEVICE_ATTR(select_amcb2_transmit_clock, S_IWUGO, NULL,
499 store_select_amcb2_transmit_clock);
501 static ssize_t store_select_amcb1_transmit_clock(struct device *d,
502 struct device_attribute *attr, const char *buf, size_t count)
508 sscanf(buf, "%lX", &tmp);
509 dev_dbg(d, "tmp = 0x%lX\n", tmp);
511 val = (unsigned char)tmp;
512 spin_lock_irqsave(&event_lock, flags);
513 if ((val == CLK_8kHz) || (val == CLK_16_384MHz)) {
514 SET_PORT_BITS(TLCLK_REG3, 0xf8, 0x5);
515 SET_PORT_BITS(TLCLK_REG1, 0xfb, ~val);
516 } else if (val >= CLK_8_592MHz) {
517 SET_PORT_BITS(TLCLK_REG3, 0xf8, 0x7);
520 SET_PORT_BITS(TLCLK_REG0, 0xfc, 1);
523 SET_PORT_BITS(TLCLK_REG0, 0xfc, 0);
526 SET_PORT_BITS(TLCLK_REG0, 0xfc, 3);
529 SET_PORT_BITS(TLCLK_REG0, 0xfc, 2);
533 SET_PORT_BITS(TLCLK_REG3, 0xf8, val);
534 spin_unlock_irqrestore(&event_lock, flags);
536 return strnlen(buf, count);
539 static DEVICE_ATTR(select_amcb1_transmit_clock, S_IWUGO, NULL,
540 store_select_amcb1_transmit_clock);
542 static ssize_t store_select_redundant_clock(struct device *d,
543 struct device_attribute *attr, const char *buf, size_t count)
549 sscanf(buf, "%lX", &tmp);
550 dev_dbg(d, "tmp = 0x%lX\n", tmp);
552 val = (unsigned char)tmp;
553 spin_lock_irqsave(&event_lock, flags);
554 SET_PORT_BITS(TLCLK_REG1, 0xfe, val);
555 spin_unlock_irqrestore(&event_lock, flags);
557 return strnlen(buf, count);
560 static DEVICE_ATTR(select_redundant_clock, S_IWUGO, NULL,
561 store_select_redundant_clock);
563 static ssize_t store_select_ref_frequency(struct device *d,
564 struct device_attribute *attr, const char *buf, size_t count)
570 sscanf(buf, "%lX", &tmp);
571 dev_dbg(d, "tmp = 0x%lX\n", tmp);
573 val = (unsigned char)tmp;
574 spin_lock_irqsave(&event_lock, flags);
575 SET_PORT_BITS(TLCLK_REG1, 0xfd, val);
576 spin_unlock_irqrestore(&event_lock, flags);
578 return strnlen(buf, count);
581 static DEVICE_ATTR(select_ref_frequency, S_IWUGO, NULL,
582 store_select_ref_frequency);
584 static ssize_t store_filter_select(struct device *d,
585 struct device_attribute *attr, const char *buf, size_t count)
591 sscanf(buf, "%lX", &tmp);
592 dev_dbg(d, "tmp = 0x%lX\n", tmp);
594 val = (unsigned char)tmp;
595 spin_lock_irqsave(&event_lock, flags);
596 SET_PORT_BITS(TLCLK_REG0, 0xfb, val);
597 spin_unlock_irqrestore(&event_lock, flags);
599 return strnlen(buf, count);
602 static DEVICE_ATTR(filter_select, S_IWUGO, NULL, store_filter_select);
604 static ssize_t store_hardware_switching_mode(struct device *d,
605 struct device_attribute *attr, const char *buf, size_t count)
611 sscanf(buf, "%lX", &tmp);
612 dev_dbg(d, "tmp = 0x%lX\n", tmp);
614 val = (unsigned char)tmp;
615 spin_lock_irqsave(&event_lock, flags);
616 SET_PORT_BITS(TLCLK_REG0, 0xbf, val);
617 spin_unlock_irqrestore(&event_lock, flags);
619 return strnlen(buf, count);
622 static DEVICE_ATTR(hardware_switching_mode, S_IWUGO, NULL,
623 store_hardware_switching_mode);
625 static ssize_t store_hardware_switching(struct device *d,
626 struct device_attribute *attr, const char *buf, size_t count)
632 sscanf(buf, "%lX", &tmp);
633 dev_dbg(d, "tmp = 0x%lX\n", tmp);
635 val = (unsigned char)tmp;
636 spin_lock_irqsave(&event_lock, flags);
637 SET_PORT_BITS(TLCLK_REG0, 0x7f, val);
638 spin_unlock_irqrestore(&event_lock, flags);
640 return strnlen(buf, count);
643 static DEVICE_ATTR(hardware_switching, S_IWUGO, NULL,
644 store_hardware_switching);
646 static ssize_t store_refalign (struct device *d,
647 struct device_attribute *attr, const char *buf, size_t count)
652 sscanf(buf, "%lX", &tmp);
653 dev_dbg(d, "tmp = 0x%lX\n", tmp);
654 spin_lock_irqsave(&event_lock, flags);
655 SET_PORT_BITS(TLCLK_REG0, 0xf7, 0);
657 SET_PORT_BITS(TLCLK_REG0, 0xf7, 0x08);
659 SET_PORT_BITS(TLCLK_REG0, 0xf7, 0);
660 spin_unlock_irqrestore(&event_lock, flags);
662 return strnlen(buf, count);
665 static DEVICE_ATTR(refalign, S_IWUGO, NULL, store_refalign);
667 static ssize_t store_mode_select (struct device *d,
668 struct device_attribute *attr, const char *buf, size_t count)
674 sscanf(buf, "%lX", &tmp);
675 dev_dbg(d, "tmp = 0x%lX\n", tmp);
677 val = (unsigned char)tmp;
678 spin_lock_irqsave(&event_lock, flags);
679 SET_PORT_BITS(TLCLK_REG0, 0xcf, val);
680 spin_unlock_irqrestore(&event_lock, flags);
682 return strnlen(buf, count);
685 static DEVICE_ATTR(mode_select, S_IWUGO, NULL, store_mode_select);
687 static ssize_t store_reset (struct device *d,
688 struct device_attribute *attr, const char *buf, size_t count)
694 sscanf(buf, "%lX", &tmp);
695 dev_dbg(d, "tmp = 0x%lX\n", tmp);
697 val = (unsigned char)tmp;
698 spin_lock_irqsave(&event_lock, flags);
699 SET_PORT_BITS(TLCLK_REG4, 0xfd, val);
700 spin_unlock_irqrestore(&event_lock, flags);
702 return strnlen(buf, count);
705 static DEVICE_ATTR(reset, S_IWUGO, NULL, store_reset);
707 static struct attribute *tlclk_sysfs_entries[] = {
708 &dev_attr_current_ref.attr,
709 &dev_attr_interrupt_switch.attr,
710 &dev_attr_alarms.attr,
711 &dev_attr_enable_clk3a_output.attr,
712 &dev_attr_enable_clk3b_output.attr,
713 &dev_attr_enable_clkb1_output.attr,
714 &dev_attr_enable_clka1_output.attr,
715 &dev_attr_enable_clkb0_output.attr,
716 &dev_attr_enable_clka0_output.attr,
717 &dev_attr_test_mode.attr,
718 &dev_attr_select_amcb1_transmit_clock.attr,
719 &dev_attr_select_amcb2_transmit_clock.attr,
720 &dev_attr_select_redundant_clock.attr,
721 &dev_attr_select_ref_frequency.attr,
722 &dev_attr_filter_select.attr,
723 &dev_attr_hardware_switching_mode.attr,
724 &dev_attr_hardware_switching.attr,
725 &dev_attr_refalign.attr,
726 &dev_attr_mode_select.attr,
727 &dev_attr_reset.attr,
731 static struct attribute_group tlclk_attribute_group = {
732 .name = NULL, /* put in device directory */
733 .attrs = tlclk_sysfs_entries,
736 static struct platform_device *tlclk_device;
738 static int __init tlclk_init(void)
742 ret = register_chrdev(tlclk_major, "telco_clock", &tlclk_fops);
744 printk(KERN_ERR "telco_clock: can't get major! %d\n", tlclk_major);
747 alarm_events = kzalloc( sizeof(struct tlclk_alarms), GFP_KERNEL);
751 /* Read telecom clock IRQ number (Set by BIOS) */
752 if (!request_region(TLCLK_BASE, 8, "telco_clock")) {
753 printk(KERN_ERR "tlclk: request_region failed! 0x%X\n",
758 telclk_interrupt = (inb(TLCLK_REG7) & 0x0f);
760 if (0x0F == telclk_interrupt ) { /* not MCPBL0010 ? */
761 printk(KERN_ERR "telclk_interrup = 0x%x non-mcpbl0010 hw\n",
767 init_timer(&switchover_timer);
769 ret = misc_register(&tlclk_miscdev);
771 printk(KERN_ERR " misc_register retruns %d\n", ret);
776 tlclk_device = platform_device_register_simple("telco_clock",
779 printk(KERN_ERR " platform_device_register retruns 0x%X\n",
780 (unsigned int) tlclk_device);
785 ret = sysfs_create_group(&tlclk_device->dev.kobj,
786 &tlclk_attribute_group);
788 printk(KERN_ERR "failed to create sysfs device attributes\n");
789 sysfs_remove_group(&tlclk_device->dev.kobj,
790 &tlclk_attribute_group);
796 platform_device_unregister(tlclk_device);
798 misc_deregister(&tlclk_miscdev);
800 release_region(TLCLK_BASE, 8);
804 unregister_chrdev(tlclk_major, "telco_clock");
808 static void __exit tlclk_cleanup(void)
810 sysfs_remove_group(&tlclk_device->dev.kobj, &tlclk_attribute_group);
811 platform_device_unregister(tlclk_device);
812 misc_deregister(&tlclk_miscdev);
813 unregister_chrdev(tlclk_major, "telco_clock");
815 release_region(TLCLK_BASE, 8);
816 del_timer_sync(&switchover_timer);
821 static void switchover_timeout(unsigned long data)
824 if ((inb(TLCLK_REG1) & 0x08) != (data & 0x08))
825 alarm_events->switchover_primary++;
827 if ((inb(TLCLK_REG1) & 0x08) != (data & 0x08))
828 alarm_events->switchover_secondary++;
831 /* Alarm processing is done, wake up read task */
832 del_timer(&switchover_timer);
837 static irqreturn_t tlclk_interrupt(int irq, void *dev_id, struct pt_regs *regs)
841 spin_lock_irqsave(&event_lock, flags);
842 /* Read and clear interrupt events */
843 int_events = inb(TLCLK_REG6);
845 /* Primary_Los changed from 0 to 1 ? */
846 if (int_events & PRI_LOS_01_MASK) {
847 if (inb(TLCLK_REG2) & SEC_LOST_MASK)
848 alarm_events->lost_clocks++;
850 alarm_events->lost_primary_clock++;
853 /* Primary_Los changed from 1 to 0 ? */
854 if (int_events & PRI_LOS_10_MASK) {
855 alarm_events->primary_clock_back++;
856 SET_PORT_BITS(TLCLK_REG1, 0xFE, 1);
858 /* Secondary_Los changed from 0 to 1 ? */
859 if (int_events & SEC_LOS_01_MASK) {
860 if (inb(TLCLK_REG2) & PRI_LOST_MASK)
861 alarm_events->lost_clocks++;
863 alarm_events->lost_secondary_clock++;
865 /* Secondary_Los changed from 1 to 0 ? */
866 if (int_events & SEC_LOS_10_MASK) {
867 alarm_events->secondary_clock_back++;
868 SET_PORT_BITS(TLCLK_REG1, 0xFE, 0);
870 if (int_events & HOLDOVER_10_MASK)
871 alarm_events->pll_end_holdover++;
873 if (int_events & UNLOCK_01_MASK)
874 alarm_events->pll_lost_sync++;
876 if (int_events & UNLOCK_10_MASK)
877 alarm_events->pll_sync++;
879 /* Holdover changed from 0 to 1 ? */
880 if (int_events & HOLDOVER_01_MASK) {
881 alarm_events->pll_holdover++;
883 /* TIMEOUT in ~10ms */
884 switchover_timer.expires = jiffies + msecs_to_jiffies(10);
885 switchover_timer.data = inb(TLCLK_REG1);
886 add_timer(&switchover_timer);
891 spin_unlock_irqrestore(&event_lock, flags);
896 module_init(tlclk_init);
897 module_exit(tlclk_cleanup);