blob: 9a2694e5f8b98311ff435f3ce4733333c5682266 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Intel & MS High Precision Event Timer Implementation.
3 *
4 * Copyright (C) 2003 Intel Corporation
5 * Venki Pallipadi
6 * (c) Copyright 2004 Hewlett-Packard Development Company, L.P.
7 * Bob Picco <robert.picco@hp.com>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
Linus Torvalds1da177e2005-04-16 15:20:36 -070014#include <linux/interrupt.h>
15#include <linux/module.h>
16#include <linux/kernel.h>
17#include <linux/types.h>
18#include <linux/miscdevice.h>
19#include <linux/major.h>
20#include <linux/ioport.h>
21#include <linux/fcntl.h>
22#include <linux/init.h>
23#include <linux/poll.h>
Al Virof23f6e02006-10-20 15:17:02 -040024#include <linux/mm.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#include <linux/proc_fs.h>
26#include <linux/spinlock.h>
27#include <linux/sysctl.h>
28#include <linux/wait.h>
29#include <linux/bcd.h>
30#include <linux/seq_file.h>
31#include <linux/bitops.h>
Tony Luck0aa366f2007-07-20 11:22:30 -070032#include <linux/clocksource.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033
34#include <asm/current.h>
35#include <asm/uaccess.h>
36#include <asm/system.h>
37#include <asm/io.h>
38#include <asm/irq.h>
39#include <asm/div64.h>
40
41#include <linux/acpi.h>
42#include <acpi/acpi_bus.h>
43#include <linux/hpet.h>
44
45/*
46 * The High Precision Event Timer driver.
47 * This driver is closely modelled after the rtc.c driver.
Alex Williamson96803822005-09-06 15:17:54 -070048 * http://www.intel.com/hardwaredesign/hpetspec.htm
Linus Torvalds1da177e2005-04-16 15:20:36 -070049 */
50#define HPET_USER_FREQ (64)
51#define HPET_DRIFT (500)
52
Randy Dunlap757c4722005-10-30 15:03:42 -080053#define HPET_RANGE_SIZE 1024 /* from HPET spec */
54
Tony Luck0aa366f2007-07-20 11:22:30 -070055#if BITS_PER_LONG == 64
56#define write_counter(V, MC) writeq(V, MC)
57#define read_counter(MC) readq(MC)
58#else
59#define write_counter(V, MC) writel(V, MC)
60#define read_counter(MC) readl(MC)
61#endif
62
Clemens Ladisch642d30b2005-10-30 15:03:31 -080063static u32 hpet_nhpet, hpet_max_freq = HPET_USER_FREQ;
Linus Torvalds1da177e2005-04-16 15:20:36 -070064
Tony Luck0aa366f2007-07-20 11:22:30 -070065static void __iomem *hpet_mctr;
66
67static cycle_t read_hpet(void)
68{
69 return (cycle_t)read_counter((void __iomem *)hpet_mctr);
70}
71
72static struct clocksource clocksource_hpet = {
73 .name = "hpet",
74 .rating = 250,
75 .read = read_hpet,
76 .mask = 0xffffffffffffffff,
77 .mult = 0, /*to be caluclated*/
78 .shift = 10,
79 .flags = CLOCK_SOURCE_IS_CONTINUOUS,
80};
81static struct clocksource *hpet_clocksource;
82
Linus Torvalds1da177e2005-04-16 15:20:36 -070083/* A lock for concurrent access by app and isr hpet activity. */
84static DEFINE_SPINLOCK(hpet_lock);
85/* A lock for concurrent intermodule access to hpet and isr hpet activity. */
86static DEFINE_SPINLOCK(hpet_task_lock);
87
88#define HPET_DEV_NAME (7)
89
90struct hpet_dev {
91 struct hpets *hd_hpets;
92 struct hpet __iomem *hd_hpet;
93 struct hpet_timer __iomem *hd_timer;
94 unsigned long hd_ireqfreq;
95 unsigned long hd_irqdata;
96 wait_queue_head_t hd_waitqueue;
97 struct fasync_struct *hd_async_queue;
98 struct hpet_task *hd_task;
99 unsigned int hd_flags;
100 unsigned int hd_irq;
101 unsigned int hd_hdwirq;
102 char hd_name[HPET_DEV_NAME];
103};
104
105struct hpets {
106 struct hpets *hp_next;
107 struct hpet __iomem *hp_hpet;
108 unsigned long hp_hpet_phys;
Tony Luck0aa366f2007-07-20 11:22:30 -0700109 struct clocksource *hp_clocksource;
Clemens Ladischba3f2132005-10-30 15:03:31 -0800110 unsigned long long hp_tick_freq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 unsigned long hp_delta;
112 unsigned int hp_ntimer;
113 unsigned int hp_which;
114 struct hpet_dev hp_dev[1];
115};
116
117static struct hpets *hpets;
118
119#define HPET_OPEN 0x0001
120#define HPET_IE 0x0002 /* interrupt enabled */
121#define HPET_PERIODIC 0x0004
Clemens Ladisch0d290862005-10-30 15:03:34 -0800122#define HPET_SHARED_IRQ 0x0008
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124
125#ifndef readq
Adrian Bunk887c27f2005-09-10 00:26:52 -0700126static inline unsigned long long readq(void __iomem *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127{
128 return readl(addr) | (((unsigned long long)readl(addr + 4)) << 32LL);
129}
130#endif
131
132#ifndef writeq
Adrian Bunk887c27f2005-09-10 00:26:52 -0700133static inline void writeq(unsigned long long v, void __iomem *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134{
135 writel(v & 0xffffffff, addr);
136 writel(v >> 32, addr + 4);
137}
138#endif
139
David Howells7d12e782006-10-05 14:55:46 +0100140static irqreturn_t hpet_interrupt(int irq, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141{
142 struct hpet_dev *devp;
143 unsigned long isr;
144
145 devp = data;
Clemens Ladisch0d290862005-10-30 15:03:34 -0800146 isr = 1 << (devp - devp->hd_hpets->hp_dev);
147
148 if ((devp->hd_flags & HPET_SHARED_IRQ) &&
149 !(isr & readl(&devp->hd_hpet->hpet_isr)))
150 return IRQ_NONE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151
152 spin_lock(&hpet_lock);
153 devp->hd_irqdata++;
154
155 /*
156 * For non-periodic timers, increment the accumulator.
157 * This has the effect of treating non-periodic like periodic.
158 */
159 if ((devp->hd_flags & (HPET_IE | HPET_PERIODIC)) == HPET_IE) {
160 unsigned long m, t;
161
162 t = devp->hd_ireqfreq;
163 m = read_counter(&devp->hd_hpet->hpet_mc);
164 write_counter(t + m + devp->hd_hpets->hp_delta,
165 &devp->hd_timer->hpet_compare);
166 }
167
Clemens Ladisch0d290862005-10-30 15:03:34 -0800168 if (devp->hd_flags & HPET_SHARED_IRQ)
169 writel(isr, &devp->hd_hpet->hpet_isr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 spin_unlock(&hpet_lock);
171
172 spin_lock(&hpet_task_lock);
173 if (devp->hd_task)
174 devp->hd_task->ht_func(devp->hd_task->ht_data);
175 spin_unlock(&hpet_task_lock);
176
177 wake_up_interruptible(&devp->hd_waitqueue);
178
179 kill_fasync(&devp->hd_async_queue, SIGIO, POLL_IN);
180
181 return IRQ_HANDLED;
182}
183
184static int hpet_open(struct inode *inode, struct file *file)
185{
186 struct hpet_dev *devp;
187 struct hpets *hpetp;
188 int i;
189
190 if (file->f_mode & FMODE_WRITE)
191 return -EINVAL;
192
193 spin_lock_irq(&hpet_lock);
194
195 for (devp = NULL, hpetp = hpets; hpetp && !devp; hpetp = hpetp->hp_next)
196 for (i = 0; i < hpetp->hp_ntimer; i++)
197 if (hpetp->hp_dev[i].hd_flags & HPET_OPEN
198 || hpetp->hp_dev[i].hd_task)
199 continue;
200 else {
201 devp = &hpetp->hp_dev[i];
202 break;
203 }
204
205 if (!devp) {
206 spin_unlock_irq(&hpet_lock);
207 return -EBUSY;
208 }
209
210 file->private_data = devp;
211 devp->hd_irqdata = 0;
212 devp->hd_flags |= HPET_OPEN;
213 spin_unlock_irq(&hpet_lock);
214
215 return 0;
216}
217
218static ssize_t
219hpet_read(struct file *file, char __user *buf, size_t count, loff_t * ppos)
220{
221 DECLARE_WAITQUEUE(wait, current);
222 unsigned long data;
223 ssize_t retval;
224 struct hpet_dev *devp;
225
226 devp = file->private_data;
227 if (!devp->hd_ireqfreq)
228 return -EIO;
229
230 if (count < sizeof(unsigned long))
231 return -EINVAL;
232
233 add_wait_queue(&devp->hd_waitqueue, &wait);
234
235 for ( ; ; ) {
236 set_current_state(TASK_INTERRUPTIBLE);
237
238 spin_lock_irq(&hpet_lock);
239 data = devp->hd_irqdata;
240 devp->hd_irqdata = 0;
241 spin_unlock_irq(&hpet_lock);
242
243 if (data)
244 break;
245 else if (file->f_flags & O_NONBLOCK) {
246 retval = -EAGAIN;
247 goto out;
248 } else if (signal_pending(current)) {
249 retval = -ERESTARTSYS;
250 goto out;
251 }
252 schedule();
253 }
254
255 retval = put_user(data, (unsigned long __user *)buf);
256 if (!retval)
257 retval = sizeof(unsigned long);
258out:
259 __set_current_state(TASK_RUNNING);
260 remove_wait_queue(&devp->hd_waitqueue, &wait);
261
262 return retval;
263}
264
265static unsigned int hpet_poll(struct file *file, poll_table * wait)
266{
267 unsigned long v;
268 struct hpet_dev *devp;
269
270 devp = file->private_data;
271
272 if (!devp->hd_ireqfreq)
273 return 0;
274
275 poll_wait(file, &devp->hd_waitqueue, wait);
276
277 spin_lock_irq(&hpet_lock);
278 v = devp->hd_irqdata;
279 spin_unlock_irq(&hpet_lock);
280
281 if (v != 0)
282 return POLLIN | POLLRDNORM;
283
284 return 0;
285}
286
287static int hpet_mmap(struct file *file, struct vm_area_struct *vma)
288{
289#ifdef CONFIG_HPET_MMAP
290 struct hpet_dev *devp;
291 unsigned long addr;
292
293 if (((vma->vm_end - vma->vm_start) != PAGE_SIZE) || vma->vm_pgoff)
294 return -EINVAL;
295
296 devp = file->private_data;
297 addr = devp->hd_hpets->hp_hpet_phys;
298
299 if (addr & (PAGE_SIZE - 1))
300 return -ENOSYS;
301
302 vma->vm_flags |= VM_IO;
303 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304
305 if (io_remap_pfn_range(vma, vma->vm_start, addr >> PAGE_SHIFT,
306 PAGE_SIZE, vma->vm_page_prot)) {
Randy Dunlap3e6716e2005-10-30 15:03:44 -0800307 printk(KERN_ERR "%s: io_remap_pfn_range failed\n",
308 __FUNCTION__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309 return -EAGAIN;
310 }
311
312 return 0;
313#else
314 return -ENOSYS;
315#endif
316}
317
318static int hpet_fasync(int fd, struct file *file, int on)
319{
320 struct hpet_dev *devp;
321
322 devp = file->private_data;
323
324 if (fasync_helper(fd, file, on, &devp->hd_async_queue) >= 0)
325 return 0;
326 else
327 return -EIO;
328}
329
330static int hpet_release(struct inode *inode, struct file *file)
331{
332 struct hpet_dev *devp;
333 struct hpet_timer __iomem *timer;
334 int irq = 0;
335
336 devp = file->private_data;
337 timer = devp->hd_timer;
338
339 spin_lock_irq(&hpet_lock);
340
341 writeq((readq(&timer->hpet_config) & ~Tn_INT_ENB_CNF_MASK),
342 &timer->hpet_config);
343
344 irq = devp->hd_irq;
345 devp->hd_irq = 0;
346
347 devp->hd_ireqfreq = 0;
348
349 if (devp->hd_flags & HPET_PERIODIC
350 && readq(&timer->hpet_config) & Tn_TYPE_CNF_MASK) {
351 unsigned long v;
352
353 v = readq(&timer->hpet_config);
354 v ^= Tn_TYPE_CNF_MASK;
355 writeq(v, &timer->hpet_config);
356 }
357
358 devp->hd_flags &= ~(HPET_OPEN | HPET_IE | HPET_PERIODIC);
359 spin_unlock_irq(&hpet_lock);
360
361 if (irq)
362 free_irq(irq, devp);
363
364 if (file->f_flags & FASYNC)
365 hpet_fasync(-1, file, 0);
366
367 file->private_data = NULL;
368 return 0;
369}
370
371static int hpet_ioctl_common(struct hpet_dev *, int, unsigned long, int);
372
373static int
374hpet_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
375 unsigned long arg)
376{
377 struct hpet_dev *devp;
378
379 devp = file->private_data;
380 return hpet_ioctl_common(devp, cmd, arg, 0);
381}
382
383static int hpet_ioctl_ieon(struct hpet_dev *devp)
384{
385 struct hpet_timer __iomem *timer;
386 struct hpet __iomem *hpet;
387 struct hpets *hpetp;
388 int irq;
389 unsigned long g, v, t, m;
390 unsigned long flags, isr;
391
392 timer = devp->hd_timer;
393 hpet = devp->hd_hpet;
394 hpetp = devp->hd_hpets;
395
Clemens Ladisch9090e6d2005-10-30 15:03:29 -0800396 if (!devp->hd_ireqfreq)
397 return -EIO;
398
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399 spin_lock_irq(&hpet_lock);
400
401 if (devp->hd_flags & HPET_IE) {
402 spin_unlock_irq(&hpet_lock);
403 return -EBUSY;
404 }
405
406 devp->hd_flags |= HPET_IE;
Clemens Ladisch0d290862005-10-30 15:03:34 -0800407
408 if (readl(&timer->hpet_config) & Tn_INT_TYPE_CNF_MASK)
409 devp->hd_flags |= HPET_SHARED_IRQ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410 spin_unlock_irq(&hpet_lock);
411
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 irq = devp->hd_hdwirq;
413
414 if (irq) {
Clemens Ladisch0d290862005-10-30 15:03:34 -0800415 unsigned long irq_flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416
Clemens Ladisch0d290862005-10-30 15:03:34 -0800417 sprintf(devp->hd_name, "hpet%d", (int)(devp - hpetp->hp_dev));
418 irq_flags = devp->hd_flags & HPET_SHARED_IRQ
Thomas Gleixner0f2ed4c2006-07-01 19:29:33 -0700419 ? IRQF_SHARED : IRQF_DISABLED;
Clemens Ladisch0d290862005-10-30 15:03:34 -0800420 if (request_irq(irq, hpet_interrupt, irq_flags,
421 devp->hd_name, (void *)devp)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422 printk(KERN_ERR "hpet: IRQ %d is not free\n", irq);
423 irq = 0;
424 }
425 }
426
427 if (irq == 0) {
428 spin_lock_irq(&hpet_lock);
429 devp->hd_flags ^= HPET_IE;
430 spin_unlock_irq(&hpet_lock);
431 return -EIO;
432 }
433
434 devp->hd_irq = irq;
435 t = devp->hd_ireqfreq;
436 v = readq(&timer->hpet_config);
437 g = v | Tn_INT_ENB_CNF_MASK;
438
439 if (devp->hd_flags & HPET_PERIODIC) {
440 write_counter(t, &timer->hpet_compare);
441 g |= Tn_TYPE_CNF_MASK;
442 v |= Tn_TYPE_CNF_MASK;
443 writeq(v, &timer->hpet_config);
444 v |= Tn_VAL_SET_CNF_MASK;
445 writeq(v, &timer->hpet_config);
446 local_irq_save(flags);
447 m = read_counter(&hpet->hpet_mc);
448 write_counter(t + m + hpetp->hp_delta, &timer->hpet_compare);
449 } else {
450 local_irq_save(flags);
451 m = read_counter(&hpet->hpet_mc);
452 write_counter(t + m + hpetp->hp_delta, &timer->hpet_compare);
453 }
454
Clemens Ladisch0d290862005-10-30 15:03:34 -0800455 if (devp->hd_flags & HPET_SHARED_IRQ) {
Clemens Ladisch3d5640d2005-10-30 15:03:39 -0800456 isr = 1 << (devp - devp->hd_hpets->hp_dev);
Clemens Ladisch0d290862005-10-30 15:03:34 -0800457 writel(isr, &hpet->hpet_isr);
458 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 writeq(g, &timer->hpet_config);
460 local_irq_restore(flags);
461
462 return 0;
463}
464
Clemens Ladischba3f2132005-10-30 15:03:31 -0800465/* converts Hz to number of timer ticks */
466static inline unsigned long hpet_time_div(struct hpets *hpets,
467 unsigned long dis)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468{
Clemens Ladischba3f2132005-10-30 15:03:31 -0800469 unsigned long long m;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470
Clemens Ladischba3f2132005-10-30 15:03:31 -0800471 m = hpets->hp_tick_freq + (dis >> 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472 do_div(m, dis);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473 return (unsigned long)m;
474}
475
476static int
477hpet_ioctl_common(struct hpet_dev *devp, int cmd, unsigned long arg, int kernel)
478{
479 struct hpet_timer __iomem *timer;
480 struct hpet __iomem *hpet;
481 struct hpets *hpetp;
482 int err;
483 unsigned long v;
484
485 switch (cmd) {
486 case HPET_IE_OFF:
487 case HPET_INFO:
488 case HPET_EPI:
489 case HPET_DPI:
490 case HPET_IRQFREQ:
491 timer = devp->hd_timer;
492 hpet = devp->hd_hpet;
493 hpetp = devp->hd_hpets;
494 break;
495 case HPET_IE_ON:
496 return hpet_ioctl_ieon(devp);
497 default:
498 return -EINVAL;
499 }
500
501 err = 0;
502
503 switch (cmd) {
504 case HPET_IE_OFF:
505 if ((devp->hd_flags & HPET_IE) == 0)
506 break;
507 v = readq(&timer->hpet_config);
508 v &= ~Tn_INT_ENB_CNF_MASK;
509 writeq(v, &timer->hpet_config);
510 if (devp->hd_irq) {
511 free_irq(devp->hd_irq, devp);
512 devp->hd_irq = 0;
513 }
514 devp->hd_flags ^= HPET_IE;
515 break;
516 case HPET_INFO:
517 {
518 struct hpet_info info;
519
Clemens Ladischaf95ead2005-10-30 15:03:38 -0800520 if (devp->hd_ireqfreq)
521 info.hi_ireqfreq =
522 hpet_time_div(hpetp, devp->hd_ireqfreq);
523 else
524 info.hi_ireqfreq = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525 info.hi_flags =
526 readq(&timer->hpet_config) & Tn_PER_INT_CAP_MASK;
Clemens Ladischc860ed92005-10-30 15:03:40 -0800527 info.hi_hpet = hpetp->hp_which;
528 info.hi_timer = devp - hpetp->hp_dev;
Clemens Ladisch8e8505b2005-10-30 15:03:37 -0800529 if (kernel)
530 memcpy((void *)arg, &info, sizeof(info));
531 else
532 if (copy_to_user((void __user *)arg, &info,
533 sizeof(info)))
534 err = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535 break;
536 }
537 case HPET_EPI:
538 v = readq(&timer->hpet_config);
539 if ((v & Tn_PER_INT_CAP_MASK) == 0) {
540 err = -ENXIO;
541 break;
542 }
543 devp->hd_flags |= HPET_PERIODIC;
544 break;
545 case HPET_DPI:
546 v = readq(&timer->hpet_config);
547 if ((v & Tn_PER_INT_CAP_MASK) == 0) {
548 err = -ENXIO;
549 break;
550 }
551 if (devp->hd_flags & HPET_PERIODIC &&
552 readq(&timer->hpet_config) & Tn_TYPE_CNF_MASK) {
553 v = readq(&timer->hpet_config);
554 v ^= Tn_TYPE_CNF_MASK;
555 writeq(v, &timer->hpet_config);
556 }
557 devp->hd_flags &= ~HPET_PERIODIC;
558 break;
559 case HPET_IRQFREQ:
560 if (!kernel && (arg > hpet_max_freq) &&
561 !capable(CAP_SYS_RESOURCE)) {
562 err = -EACCES;
563 break;
564 }
565
Clemens Ladisch189e2dd2005-10-30 15:03:33 -0800566 if (!arg) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567 err = -EINVAL;
568 break;
569 }
570
Clemens Ladischba3f2132005-10-30 15:03:31 -0800571 devp->hd_ireqfreq = hpet_time_div(hpetp, arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572 }
573
574 return err;
575}
576
Arjan van de Ven62322d22006-07-03 00:24:21 -0700577static const struct file_operations hpet_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578 .owner = THIS_MODULE,
579 .llseek = no_llseek,
580 .read = hpet_read,
581 .poll = hpet_poll,
582 .ioctl = hpet_ioctl,
583 .open = hpet_open,
584 .release = hpet_release,
585 .fasync = hpet_fasync,
586 .mmap = hpet_mmap,
587};
588
Randy Dunlap3e6716e2005-10-30 15:03:44 -0800589static int hpet_is_known(struct hpet_data *hdp)
590{
591 struct hpets *hpetp;
592
593 for (hpetp = hpets; hpetp; hpetp = hpetp->hp_next)
594 if (hpetp->hp_hpet_phys == hdp->hd_phys_address)
595 return 1;
596
597 return 0;
598}
599
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600EXPORT_SYMBOL(hpet_alloc);
601EXPORT_SYMBOL(hpet_register);
602EXPORT_SYMBOL(hpet_unregister);
603EXPORT_SYMBOL(hpet_control);
604
605int hpet_register(struct hpet_task *tp, int periodic)
606{
607 unsigned int i;
608 u64 mask;
609 struct hpet_timer __iomem *timer;
610 struct hpet_dev *devp;
611 struct hpets *hpetp;
612
613 switch (periodic) {
614 case 1:
615 mask = Tn_PER_INT_CAP_MASK;
616 break;
617 case 0:
618 mask = 0;
619 break;
620 default:
621 return -EINVAL;
622 }
623
Clemens Ladisch7522e4e2005-10-30 15:03:39 -0800624 tp->ht_opaque = NULL;
625
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626 spin_lock_irq(&hpet_task_lock);
627 spin_lock(&hpet_lock);
628
629 for (devp = NULL, hpetp = hpets; hpetp && !devp; hpetp = hpetp->hp_next)
630 for (timer = hpetp->hp_hpet->hpet_timers, i = 0;
631 i < hpetp->hp_ntimer; i++, timer++) {
632 if ((readq(&timer->hpet_config) & Tn_PER_INT_CAP_MASK)
633 != mask)
634 continue;
635
636 devp = &hpetp->hp_dev[i];
637
638 if (devp->hd_flags & HPET_OPEN || devp->hd_task) {
639 devp = NULL;
640 continue;
641 }
642
643 tp->ht_opaque = devp;
644 devp->hd_task = tp;
645 break;
646 }
647
648 spin_unlock(&hpet_lock);
649 spin_unlock_irq(&hpet_task_lock);
650
651 if (tp->ht_opaque)
652 return 0;
653 else
654 return -EBUSY;
655}
656
657static inline int hpet_tpcheck(struct hpet_task *tp)
658{
659 struct hpet_dev *devp;
660 struct hpets *hpetp;
661
662 devp = tp->ht_opaque;
663
664 if (!devp)
665 return -ENXIO;
666
667 for (hpetp = hpets; hpetp; hpetp = hpetp->hp_next)
668 if (devp >= hpetp->hp_dev
669 && devp < (hpetp->hp_dev + hpetp->hp_ntimer)
670 && devp->hd_hpet == hpetp->hp_hpet)
671 return 0;
672
673 return -ENXIO;
674}
675
676int hpet_unregister(struct hpet_task *tp)
677{
678 struct hpet_dev *devp;
679 struct hpet_timer __iomem *timer;
680 int err;
681
682 if ((err = hpet_tpcheck(tp)))
683 return err;
684
685 spin_lock_irq(&hpet_task_lock);
686 spin_lock(&hpet_lock);
687
688 devp = tp->ht_opaque;
689 if (devp->hd_task != tp) {
690 spin_unlock(&hpet_lock);
691 spin_unlock_irq(&hpet_task_lock);
692 return -ENXIO;
693 }
694
695 timer = devp->hd_timer;
696 writeq((readq(&timer->hpet_config) & ~Tn_INT_ENB_CNF_MASK),
697 &timer->hpet_config);
698 devp->hd_flags &= ~(HPET_IE | HPET_PERIODIC);
699 devp->hd_task = NULL;
700 spin_unlock(&hpet_lock);
701 spin_unlock_irq(&hpet_task_lock);
702
703 return 0;
704}
705
706int hpet_control(struct hpet_task *tp, unsigned int cmd, unsigned long arg)
707{
708 struct hpet_dev *devp;
709 int err;
710
711 if ((err = hpet_tpcheck(tp)))
712 return err;
713
714 spin_lock_irq(&hpet_lock);
715 devp = tp->ht_opaque;
716 if (devp->hd_task != tp) {
717 spin_unlock_irq(&hpet_lock);
718 return -ENXIO;
719 }
720 spin_unlock_irq(&hpet_lock);
721 return hpet_ioctl_common(devp, cmd, arg, 1);
722}
723
724static ctl_table hpet_table[] = {
725 {
Eric W. Biederman22943362007-02-14 00:33:51 -0800726 .ctl_name = CTL_UNNUMBERED,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727 .procname = "max-user-freq",
728 .data = &hpet_max_freq,
729 .maxlen = sizeof(int),
730 .mode = 0644,
731 .proc_handler = &proc_dointvec,
732 },
733 {.ctl_name = 0}
734};
735
736static ctl_table hpet_root[] = {
737 {
Eric W. Biederman22943362007-02-14 00:33:51 -0800738 .ctl_name = CTL_UNNUMBERED,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739 .procname = "hpet",
740 .maxlen = 0,
741 .mode = 0555,
742 .child = hpet_table,
743 },
744 {.ctl_name = 0}
745};
746
747static ctl_table dev_root[] = {
748 {
749 .ctl_name = CTL_DEV,
750 .procname = "dev",
751 .maxlen = 0,
752 .mode = 0555,
753 .child = hpet_root,
754 },
755 {.ctl_name = 0}
756};
757
758static struct ctl_table_header *sysctl_header;
759
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760/*
761 * Adjustment for when arming the timer with
762 * initial conditions. That is, main counter
763 * ticks expired before interrupts are enabled.
764 */
765#define TICK_CALIBRATE (1000UL)
766
767static unsigned long hpet_calibrate(struct hpets *hpetp)
768{
769 struct hpet_timer __iomem *timer = NULL;
770 unsigned long t, m, count, i, flags, start;
771 struct hpet_dev *devp;
772 int j;
773 struct hpet __iomem *hpet;
774
775 for (j = 0, devp = hpetp->hp_dev; j < hpetp->hp_ntimer; j++, devp++)
776 if ((devp->hd_flags & HPET_OPEN) == 0) {
777 timer = devp->hd_timer;
778 break;
779 }
780
781 if (!timer)
782 return 0;
783
Clemens Ladisch3d5640d2005-10-30 15:03:39 -0800784 hpet = hpetp->hp_hpet;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785 t = read_counter(&timer->hpet_compare);
786
787 i = 0;
Clemens Ladischba3f2132005-10-30 15:03:31 -0800788 count = hpet_time_div(hpetp, TICK_CALIBRATE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789
790 local_irq_save(flags);
791
792 start = read_counter(&hpet->hpet_mc);
793
794 do {
795 m = read_counter(&hpet->hpet_mc);
796 write_counter(t + m + hpetp->hp_delta, &timer->hpet_compare);
797 } while (i++, (m - start) < count);
798
799 local_irq_restore(flags);
800
801 return (m - start) / i;
802}
803
804int hpet_alloc(struct hpet_data *hdp)
805{
806 u64 cap, mcfg;
807 struct hpet_dev *devp;
808 u32 i, ntimer;
809 struct hpets *hpetp;
810 size_t siz;
811 struct hpet __iomem *hpet;
Randy Dunlap3e6716e2005-10-30 15:03:44 -0800812 static struct hpets *last = NULL;
Clemens Ladisch318db8f2005-10-30 15:03:41 -0800813 unsigned long period;
Clemens Ladischba3f2132005-10-30 15:03:31 -0800814 unsigned long long temp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815
816 /*
817 * hpet_alloc can be called by platform dependent code.
Randy Dunlap3e6716e2005-10-30 15:03:44 -0800818 * If platform dependent code has allocated the hpet that
819 * ACPI has also reported, then we catch it here.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820 */
Randy Dunlap3e6716e2005-10-30 15:03:44 -0800821 if (hpet_is_known(hdp)) {
822 printk(KERN_DEBUG "%s: duplicate HPET ignored\n",
823 __FUNCTION__);
824 return 0;
825 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700826
827 siz = sizeof(struct hpets) + ((hdp->hd_nirqs - 1) *
828 sizeof(struct hpet_dev));
829
Randy Dunlap3e6716e2005-10-30 15:03:44 -0800830 hpetp = kzalloc(siz, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831
832 if (!hpetp)
833 return -ENOMEM;
834
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835 hpetp->hp_which = hpet_nhpet++;
836 hpetp->hp_hpet = hdp->hd_address;
837 hpetp->hp_hpet_phys = hdp->hd_phys_address;
838
839 hpetp->hp_ntimer = hdp->hd_nirqs;
840
841 for (i = 0; i < hdp->hd_nirqs; i++)
842 hpetp->hp_dev[i].hd_hdwirq = hdp->hd_irq[i];
843
844 hpet = hpetp->hp_hpet;
845
846 cap = readq(&hpet->hpet_cap);
847
848 ntimer = ((cap & HPET_NUM_TIM_CAP_MASK) >> HPET_NUM_TIM_CAP_SHIFT) + 1;
849
850 if (hpetp->hp_ntimer != ntimer) {
851 printk(KERN_WARNING "hpet: number irqs doesn't agree"
852 " with number of timers\n");
853 kfree(hpetp);
854 return -ENODEV;
855 }
856
857 if (last)
858 last->hp_next = hpetp;
859 else
860 hpets = hpetp;
861
862 last = hpetp;
863
Clemens Ladischba3f2132005-10-30 15:03:31 -0800864 period = (cap & HPET_COUNTER_CLK_PERIOD_MASK) >>
865 HPET_COUNTER_CLK_PERIOD_SHIFT; /* fs, 10^-15 */
866 temp = 1000000000000000uLL; /* 10^15 femtoseconds per second */
867 temp += period >> 1; /* round */
868 do_div(temp, period);
869 hpetp->hp_tick_freq = temp; /* ticks per second */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700870
Andi Kleen3034d112006-09-26 10:52:28 +0200871 printk(KERN_INFO "hpet%d: at MMIO 0x%lx, IRQ%s",
872 hpetp->hp_which, hdp->hd_phys_address,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873 hpetp->hp_ntimer > 1 ? "s" : "");
874 for (i = 0; i < hpetp->hp_ntimer; i++)
875 printk("%s %d", i > 0 ? "," : "", hdp->hd_irq[i]);
876 printk("\n");
877
Clemens Ladisch318db8f2005-10-30 15:03:41 -0800878 printk(KERN_INFO "hpet%u: %u %d-bit timers, %Lu Hz\n",
879 hpetp->hp_which, hpetp->hp_ntimer,
880 cap & HPET_COUNTER_SIZE_MASK ? 64 : 32, hpetp->hp_tick_freq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881
882 mcfg = readq(&hpet->hpet_config);
883 if ((mcfg & HPET_ENABLE_CNF_MASK) == 0) {
884 write_counter(0L, &hpet->hpet_mc);
885 mcfg |= HPET_ENABLE_CNF_MASK;
886 writeq(mcfg, &hpet->hpet_config);
887 }
888
Clemens Ladisch642d30b2005-10-30 15:03:31 -0800889 for (i = 0, devp = hpetp->hp_dev; i < hpetp->hp_ntimer; i++, devp++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700890 struct hpet_timer __iomem *timer;
891
892 timer = &hpet->hpet_timers[devp - hpetp->hp_dev];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893
894 devp->hd_hpets = hpetp;
895 devp->hd_hpet = hpet;
896 devp->hd_timer = timer;
897
898 /*
899 * If the timer was reserved by platform code,
900 * then make timer unavailable for opens.
901 */
902 if (hdp->hd_state & (1 << i)) {
903 devp->hd_flags = HPET_OPEN;
904 continue;
905 }
906
907 init_waitqueue_head(&devp->hd_waitqueue);
908 }
909
910 hpetp->hp_delta = hpet_calibrate(hpetp);
Tony Luck0aa366f2007-07-20 11:22:30 -0700911
912 if (!hpet_clocksource) {
913 hpet_mctr = (void __iomem *)&hpetp->hp_hpet->hpet_mc;
914 CLKSRC_FSYS_MMIO_SET(clocksource_hpet.fsys_mmio, hpet_mctr);
915 clocksource_hpet.mult = clocksource_hz2mult(hpetp->hp_tick_freq,
916 clocksource_hpet.shift);
917 clocksource_register(&clocksource_hpet);
918 hpetp->hp_clocksource = &clocksource_hpet;
919 hpet_clocksource = &clocksource_hpet;
920 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700921
922 return 0;
923}
924
925static acpi_status hpet_resources(struct acpi_resource *res, void *data)
926{
927 struct hpet_data *hdp;
928 acpi_status status;
929 struct acpi_resource_address64 addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700930
931 hdp = data;
932
933 status = acpi_resource_to_address64(res, &addr);
934
935 if (ACPI_SUCCESS(status)) {
Bob Moore50eca3e2005-09-30 19:03:00 -0400936 hdp->hd_phys_address = addr.minimum;
Bjorn Helgaas9224a862006-03-28 17:04:00 -0500937 hdp->hd_address = ioremap(addr.minimum, addr.address_length);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700938
Randy Dunlap3e6716e2005-10-30 15:03:44 -0800939 if (hpet_is_known(hdp)) {
940 printk(KERN_DEBUG "%s: 0x%lx is busy\n",
941 __FUNCTION__, hdp->hd_phys_address);
942 iounmap(hdp->hd_address);
943 return -EBUSY;
944 }
Bob Moore50eca3e2005-09-30 19:03:00 -0400945 } else if (res->type == ACPI_RESOURCE_TYPE_FIXED_MEMORY32) {
946 struct acpi_resource_fixed_memory32 *fixmem32;
Randy Dunlap757c4722005-10-30 15:03:42 -0800947
948 fixmem32 = &res->data.fixed_memory32;
949 if (!fixmem32)
950 return -EINVAL;
951
Bob Moore50eca3e2005-09-30 19:03:00 -0400952 hdp->hd_phys_address = fixmem32->address;
953 hdp->hd_address = ioremap(fixmem32->address,
Randy Dunlap757c4722005-10-30 15:03:42 -0800954 HPET_RANGE_SIZE);
955
Randy Dunlap3e6716e2005-10-30 15:03:44 -0800956 if (hpet_is_known(hdp)) {
957 printk(KERN_DEBUG "%s: 0x%lx is busy\n",
958 __FUNCTION__, hdp->hd_phys_address);
959 iounmap(hdp->hd_address);
960 return -EBUSY;
961 }
Bob Moore50eca3e2005-09-30 19:03:00 -0400962 } else if (res->type == ACPI_RESOURCE_TYPE_EXTENDED_IRQ) {
963 struct acpi_resource_extended_irq *irqp;
Bjorn Helgaasbe5efff2006-02-14 13:53:02 -0800964 int i, irq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700965
966 irqp = &res->data.extended_irq;
967
Bjorn Helgaasbe5efff2006-02-14 13:53:02 -0800968 for (i = 0; i < irqp->interrupt_count; i++) {
969 irq = acpi_register_gsi(irqp->interrupts[i],
970 irqp->triggering, irqp->polarity);
971 if (irq < 0)
972 return AE_ERROR;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700973
Bjorn Helgaasbe5efff2006-02-14 13:53:02 -0800974 hdp->hd_irq[hdp->hd_nirqs] = irq;
975 hdp->hd_nirqs++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976 }
977 }
978
979 return AE_OK;
980}
981
982static int hpet_acpi_add(struct acpi_device *device)
983{
984 acpi_status result;
985 struct hpet_data data;
986
987 memset(&data, 0, sizeof(data));
988
989 result =
990 acpi_walk_resources(device->handle, METHOD_NAME__CRS,
991 hpet_resources, &data);
992
993 if (ACPI_FAILURE(result))
994 return -ENODEV;
995
996 if (!data.hd_address || !data.hd_nirqs) {
997 printk("%s: no address or irqs in _CRS\n", __FUNCTION__);
998 return -ENODEV;
999 }
1000
1001 return hpet_alloc(&data);
1002}
1003
1004static int hpet_acpi_remove(struct acpi_device *device, int type)
1005{
Tony Luck0aa366f2007-07-20 11:22:30 -07001006 /* XXX need to unregister clocksource, dealloc mem, etc */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001007 return -EINVAL;
1008}
1009
Thomas Renninger1ba90e32007-07-23 14:44:41 +02001010static const struct acpi_device_id hpet_device_ids[] = {
1011 {"PNP0103", 0},
1012 {"", 0},
1013};
1014MODULE_DEVICE_TABLE(acpi, hpet_device_ids);
1015
Linus Torvalds1da177e2005-04-16 15:20:36 -07001016static struct acpi_driver hpet_acpi_driver = {
1017 .name = "hpet",
Thomas Renninger1ba90e32007-07-23 14:44:41 +02001018 .ids = hpet_device_ids,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001019 .ops = {
1020 .add = hpet_acpi_add,
1021 .remove = hpet_acpi_remove,
1022 },
1023};
1024
1025static struct miscdevice hpet_misc = { HPET_MINOR, "hpet", &hpet_fops };
1026
1027static int __init hpet_init(void)
1028{
1029 int result;
1030
1031 result = misc_register(&hpet_misc);
1032 if (result < 0)
1033 return -ENODEV;
1034
Eric W. Biederman0b4d4142007-02-14 00:34:09 -08001035 sysctl_header = register_sysctl_table(dev_root);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001036
1037 result = acpi_bus_register_driver(&hpet_acpi_driver);
1038 if (result < 0) {
1039 if (sysctl_header)
1040 unregister_sysctl_table(sysctl_header);
1041 misc_deregister(&hpet_misc);
1042 return result;
1043 }
1044
1045 return 0;
1046}
1047
1048static void __exit hpet_exit(void)
1049{
1050 acpi_bus_unregister_driver(&hpet_acpi_driver);
1051
1052 if (sysctl_header)
1053 unregister_sysctl_table(sysctl_header);
1054 misc_deregister(&hpet_misc);
1055
1056 return;
1057}
1058
1059module_init(hpet_init);
1060module_exit(hpet_exit);
1061MODULE_AUTHOR("Bob Picco <Robert.Picco@hp.com>");
1062MODULE_LICENSE("GPL");