Commit | Line | Data |
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1da177e4 LT |
1 | /* |
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 | ||
1da177e4 LT |
14 | #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> | |
f23f6e08 | 24 | #include <linux/mm.h> |
1da177e4 LT |
25 | #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> | |
0aa366f3 | 32 | #include <linux/clocksource.h> |
1da177e4 LT |
33 | |
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. | |
96803820 | 48 | * http://www.intel.com/hardwaredesign/hpetspec.htm |
1da177e4 LT |
49 | */ |
50 | #define HPET_USER_FREQ (64) | |
51 | #define HPET_DRIFT (500) | |
52 | ||
757c4724 RD |
53 | #define HPET_RANGE_SIZE 1024 /* from HPET spec */ |
54 | ||
0aa366f3 TL |
55 | #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 | ||
642d30bb | 63 | static u32 hpet_nhpet, hpet_max_freq = HPET_USER_FREQ; |
1da177e4 | 64 | |
3dffec45 ÇO |
65 | /* This clocksource driver currently only works on ia64 */ |
66 | #ifdef CONFIG_IA64 | |
0aa366f3 TL |
67 | static void __iomem *hpet_mctr; |
68 | ||
69 | static cycle_t read_hpet(void) | |
70 | { | |
71 | return (cycle_t)read_counter((void __iomem *)hpet_mctr); | |
72 | } | |
73 | ||
74 | static struct clocksource clocksource_hpet = { | |
75 | .name = "hpet", | |
76 | .rating = 250, | |
77 | .read = read_hpet, | |
712aaa1c | 78 | .mask = CLOCKSOURCE_MASK(64), |
0aa366f3 TL |
79 | .mult = 0, /*to be caluclated*/ |
80 | .shift = 10, | |
81 | .flags = CLOCK_SOURCE_IS_CONTINUOUS, | |
82 | }; | |
83 | static struct clocksource *hpet_clocksource; | |
3dffec45 | 84 | #endif |
0aa366f3 | 85 | |
1da177e4 LT |
86 | /* A lock for concurrent access by app and isr hpet activity. */ |
87 | static DEFINE_SPINLOCK(hpet_lock); | |
88 | /* A lock for concurrent intermodule access to hpet and isr hpet activity. */ | |
89 | static DEFINE_SPINLOCK(hpet_task_lock); | |
90 | ||
91 | #define HPET_DEV_NAME (7) | |
92 | ||
93 | struct hpet_dev { | |
94 | struct hpets *hd_hpets; | |
95 | struct hpet __iomem *hd_hpet; | |
96 | struct hpet_timer __iomem *hd_timer; | |
97 | unsigned long hd_ireqfreq; | |
98 | unsigned long hd_irqdata; | |
99 | wait_queue_head_t hd_waitqueue; | |
100 | struct fasync_struct *hd_async_queue; | |
101 | struct hpet_task *hd_task; | |
102 | unsigned int hd_flags; | |
103 | unsigned int hd_irq; | |
104 | unsigned int hd_hdwirq; | |
105 | char hd_name[HPET_DEV_NAME]; | |
106 | }; | |
107 | ||
108 | struct hpets { | |
109 | struct hpets *hp_next; | |
110 | struct hpet __iomem *hp_hpet; | |
111 | unsigned long hp_hpet_phys; | |
0aa366f3 | 112 | struct clocksource *hp_clocksource; |
ba3f213f | 113 | unsigned long long hp_tick_freq; |
1da177e4 LT |
114 | unsigned long hp_delta; |
115 | unsigned int hp_ntimer; | |
116 | unsigned int hp_which; | |
117 | struct hpet_dev hp_dev[1]; | |
118 | }; | |
119 | ||
120 | static struct hpets *hpets; | |
121 | ||
122 | #define HPET_OPEN 0x0001 | |
123 | #define HPET_IE 0x0002 /* interrupt enabled */ | |
124 | #define HPET_PERIODIC 0x0004 | |
0d290861 | 125 | #define HPET_SHARED_IRQ 0x0008 |
1da177e4 | 126 | |
1da177e4 LT |
127 | |
128 | #ifndef readq | |
887c27f3 | 129 | static inline unsigned long long readq(void __iomem *addr) |
1da177e4 LT |
130 | { |
131 | return readl(addr) | (((unsigned long long)readl(addr + 4)) << 32LL); | |
132 | } | |
133 | #endif | |
134 | ||
135 | #ifndef writeq | |
887c27f3 | 136 | static inline void writeq(unsigned long long v, void __iomem *addr) |
1da177e4 LT |
137 | { |
138 | writel(v & 0xffffffff, addr); | |
139 | writel(v >> 32, addr + 4); | |
140 | } | |
141 | #endif | |
142 | ||
7d12e780 | 143 | static irqreturn_t hpet_interrupt(int irq, void *data) |
1da177e4 LT |
144 | { |
145 | struct hpet_dev *devp; | |
146 | unsigned long isr; | |
147 | ||
148 | devp = data; | |
0d290861 CL |
149 | isr = 1 << (devp - devp->hd_hpets->hp_dev); |
150 | ||
151 | if ((devp->hd_flags & HPET_SHARED_IRQ) && | |
152 | !(isr & readl(&devp->hd_hpet->hpet_isr))) | |
153 | return IRQ_NONE; | |
1da177e4 LT |
154 | |
155 | spin_lock(&hpet_lock); | |
156 | devp->hd_irqdata++; | |
157 | ||
158 | /* | |
159 | * For non-periodic timers, increment the accumulator. | |
160 | * This has the effect of treating non-periodic like periodic. | |
161 | */ | |
162 | if ((devp->hd_flags & (HPET_IE | HPET_PERIODIC)) == HPET_IE) { | |
163 | unsigned long m, t; | |
164 | ||
165 | t = devp->hd_ireqfreq; | |
166 | m = read_counter(&devp->hd_hpet->hpet_mc); | |
167 | write_counter(t + m + devp->hd_hpets->hp_delta, | |
168 | &devp->hd_timer->hpet_compare); | |
169 | } | |
170 | ||
0d290861 CL |
171 | if (devp->hd_flags & HPET_SHARED_IRQ) |
172 | writel(isr, &devp->hd_hpet->hpet_isr); | |
1da177e4 LT |
173 | spin_unlock(&hpet_lock); |
174 | ||
175 | spin_lock(&hpet_task_lock); | |
176 | if (devp->hd_task) | |
177 | devp->hd_task->ht_func(devp->hd_task->ht_data); | |
178 | spin_unlock(&hpet_task_lock); | |
179 | ||
180 | wake_up_interruptible(&devp->hd_waitqueue); | |
181 | ||
182 | kill_fasync(&devp->hd_async_queue, SIGIO, POLL_IN); | |
183 | ||
184 | return IRQ_HANDLED; | |
185 | } | |
186 | ||
187 | static int hpet_open(struct inode *inode, struct file *file) | |
188 | { | |
189 | struct hpet_dev *devp; | |
190 | struct hpets *hpetp; | |
191 | int i; | |
192 | ||
193 | if (file->f_mode & FMODE_WRITE) | |
194 | return -EINVAL; | |
195 | ||
196 | spin_lock_irq(&hpet_lock); | |
197 | ||
198 | for (devp = NULL, hpetp = hpets; hpetp && !devp; hpetp = hpetp->hp_next) | |
199 | for (i = 0; i < hpetp->hp_ntimer; i++) | |
200 | if (hpetp->hp_dev[i].hd_flags & HPET_OPEN | |
201 | || hpetp->hp_dev[i].hd_task) | |
202 | continue; | |
203 | else { | |
204 | devp = &hpetp->hp_dev[i]; | |
205 | break; | |
206 | } | |
207 | ||
208 | if (!devp) { | |
209 | spin_unlock_irq(&hpet_lock); | |
210 | return -EBUSY; | |
211 | } | |
212 | ||
213 | file->private_data = devp; | |
214 | devp->hd_irqdata = 0; | |
215 | devp->hd_flags |= HPET_OPEN; | |
216 | spin_unlock_irq(&hpet_lock); | |
217 | ||
218 | return 0; | |
219 | } | |
220 | ||
221 | static ssize_t | |
222 | hpet_read(struct file *file, char __user *buf, size_t count, loff_t * ppos) | |
223 | { | |
224 | DECLARE_WAITQUEUE(wait, current); | |
225 | unsigned long data; | |
226 | ssize_t retval; | |
227 | struct hpet_dev *devp; | |
228 | ||
229 | devp = file->private_data; | |
230 | if (!devp->hd_ireqfreq) | |
231 | return -EIO; | |
232 | ||
233 | if (count < sizeof(unsigned long)) | |
234 | return -EINVAL; | |
235 | ||
236 | add_wait_queue(&devp->hd_waitqueue, &wait); | |
237 | ||
238 | for ( ; ; ) { | |
239 | set_current_state(TASK_INTERRUPTIBLE); | |
240 | ||
241 | spin_lock_irq(&hpet_lock); | |
242 | data = devp->hd_irqdata; | |
243 | devp->hd_irqdata = 0; | |
244 | spin_unlock_irq(&hpet_lock); | |
245 | ||
246 | if (data) | |
247 | break; | |
248 | else if (file->f_flags & O_NONBLOCK) { | |
249 | retval = -EAGAIN; | |
250 | goto out; | |
251 | } else if (signal_pending(current)) { | |
252 | retval = -ERESTARTSYS; | |
253 | goto out; | |
254 | } | |
255 | schedule(); | |
256 | } | |
257 | ||
258 | retval = put_user(data, (unsigned long __user *)buf); | |
259 | if (!retval) | |
260 | retval = sizeof(unsigned long); | |
261 | out: | |
262 | __set_current_state(TASK_RUNNING); | |
263 | remove_wait_queue(&devp->hd_waitqueue, &wait); | |
264 | ||
265 | return retval; | |
266 | } | |
267 | ||
268 | static unsigned int hpet_poll(struct file *file, poll_table * wait) | |
269 | { | |
270 | unsigned long v; | |
271 | struct hpet_dev *devp; | |
272 | ||
273 | devp = file->private_data; | |
274 | ||
275 | if (!devp->hd_ireqfreq) | |
276 | return 0; | |
277 | ||
278 | poll_wait(file, &devp->hd_waitqueue, wait); | |
279 | ||
280 | spin_lock_irq(&hpet_lock); | |
281 | v = devp->hd_irqdata; | |
282 | spin_unlock_irq(&hpet_lock); | |
283 | ||
284 | if (v != 0) | |
285 | return POLLIN | POLLRDNORM; | |
286 | ||
287 | return 0; | |
288 | } | |
289 | ||
290 | static int hpet_mmap(struct file *file, struct vm_area_struct *vma) | |
291 | { | |
292 | #ifdef CONFIG_HPET_MMAP | |
293 | struct hpet_dev *devp; | |
294 | unsigned long addr; | |
295 | ||
296 | if (((vma->vm_end - vma->vm_start) != PAGE_SIZE) || vma->vm_pgoff) | |
297 | return -EINVAL; | |
298 | ||
299 | devp = file->private_data; | |
300 | addr = devp->hd_hpets->hp_hpet_phys; | |
301 | ||
302 | if (addr & (PAGE_SIZE - 1)) | |
303 | return -ENOSYS; | |
304 | ||
305 | vma->vm_flags |= VM_IO; | |
306 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); | |
1da177e4 LT |
307 | |
308 | if (io_remap_pfn_range(vma, vma->vm_start, addr >> PAGE_SHIFT, | |
309 | PAGE_SIZE, vma->vm_page_prot)) { | |
3e6716e7 RD |
310 | printk(KERN_ERR "%s: io_remap_pfn_range failed\n", |
311 | __FUNCTION__); | |
1da177e4 LT |
312 | return -EAGAIN; |
313 | } | |
314 | ||
315 | return 0; | |
316 | #else | |
317 | return -ENOSYS; | |
318 | #endif | |
319 | } | |
320 | ||
321 | static int hpet_fasync(int fd, struct file *file, int on) | |
322 | { | |
323 | struct hpet_dev *devp; | |
324 | ||
325 | devp = file->private_data; | |
326 | ||
327 | if (fasync_helper(fd, file, on, &devp->hd_async_queue) >= 0) | |
328 | return 0; | |
329 | else | |
330 | return -EIO; | |
331 | } | |
332 | ||
333 | static int hpet_release(struct inode *inode, struct file *file) | |
334 | { | |
335 | struct hpet_dev *devp; | |
336 | struct hpet_timer __iomem *timer; | |
337 | int irq = 0; | |
338 | ||
339 | devp = file->private_data; | |
340 | timer = devp->hd_timer; | |
341 | ||
342 | spin_lock_irq(&hpet_lock); | |
343 | ||
344 | writeq((readq(&timer->hpet_config) & ~Tn_INT_ENB_CNF_MASK), | |
345 | &timer->hpet_config); | |
346 | ||
347 | irq = devp->hd_irq; | |
348 | devp->hd_irq = 0; | |
349 | ||
350 | devp->hd_ireqfreq = 0; | |
351 | ||
352 | if (devp->hd_flags & HPET_PERIODIC | |
353 | && readq(&timer->hpet_config) & Tn_TYPE_CNF_MASK) { | |
354 | unsigned long v; | |
355 | ||
356 | v = readq(&timer->hpet_config); | |
357 | v ^= Tn_TYPE_CNF_MASK; | |
358 | writeq(v, &timer->hpet_config); | |
359 | } | |
360 | ||
361 | devp->hd_flags &= ~(HPET_OPEN | HPET_IE | HPET_PERIODIC); | |
362 | spin_unlock_irq(&hpet_lock); | |
363 | ||
364 | if (irq) | |
365 | free_irq(irq, devp); | |
366 | ||
367 | if (file->f_flags & FASYNC) | |
368 | hpet_fasync(-1, file, 0); | |
369 | ||
370 | file->private_data = NULL; | |
371 | return 0; | |
372 | } | |
373 | ||
374 | static int hpet_ioctl_common(struct hpet_dev *, int, unsigned long, int); | |
375 | ||
376 | static int | |
377 | hpet_ioctl(struct inode *inode, struct file *file, unsigned int cmd, | |
378 | unsigned long arg) | |
379 | { | |
380 | struct hpet_dev *devp; | |
381 | ||
382 | devp = file->private_data; | |
383 | return hpet_ioctl_common(devp, cmd, arg, 0); | |
384 | } | |
385 | ||
386 | static int hpet_ioctl_ieon(struct hpet_dev *devp) | |
387 | { | |
388 | struct hpet_timer __iomem *timer; | |
389 | struct hpet __iomem *hpet; | |
390 | struct hpets *hpetp; | |
391 | int irq; | |
392 | unsigned long g, v, t, m; | |
393 | unsigned long flags, isr; | |
394 | ||
395 | timer = devp->hd_timer; | |
396 | hpet = devp->hd_hpet; | |
397 | hpetp = devp->hd_hpets; | |
398 | ||
9090e6db CL |
399 | if (!devp->hd_ireqfreq) |
400 | return -EIO; | |
401 | ||
1da177e4 LT |
402 | spin_lock_irq(&hpet_lock); |
403 | ||
404 | if (devp->hd_flags & HPET_IE) { | |
405 | spin_unlock_irq(&hpet_lock); | |
406 | return -EBUSY; | |
407 | } | |
408 | ||
409 | devp->hd_flags |= HPET_IE; | |
0d290861 CL |
410 | |
411 | if (readl(&timer->hpet_config) & Tn_INT_TYPE_CNF_MASK) | |
412 | devp->hd_flags |= HPET_SHARED_IRQ; | |
1da177e4 LT |
413 | spin_unlock_irq(&hpet_lock); |
414 | ||
1da177e4 LT |
415 | irq = devp->hd_hdwirq; |
416 | ||
417 | if (irq) { | |
0d290861 | 418 | unsigned long irq_flags; |
1da177e4 | 419 | |
0d290861 CL |
420 | sprintf(devp->hd_name, "hpet%d", (int)(devp - hpetp->hp_dev)); |
421 | irq_flags = devp->hd_flags & HPET_SHARED_IRQ | |
0f2ed4c6 | 422 | ? IRQF_SHARED : IRQF_DISABLED; |
0d290861 CL |
423 | if (request_irq(irq, hpet_interrupt, irq_flags, |
424 | devp->hd_name, (void *)devp)) { | |
1da177e4 LT |
425 | printk(KERN_ERR "hpet: IRQ %d is not free\n", irq); |
426 | irq = 0; | |
427 | } | |
428 | } | |
429 | ||
430 | if (irq == 0) { | |
431 | spin_lock_irq(&hpet_lock); | |
432 | devp->hd_flags ^= HPET_IE; | |
433 | spin_unlock_irq(&hpet_lock); | |
434 | return -EIO; | |
435 | } | |
436 | ||
437 | devp->hd_irq = irq; | |
438 | t = devp->hd_ireqfreq; | |
439 | v = readq(&timer->hpet_config); | |
440 | g = v | Tn_INT_ENB_CNF_MASK; | |
441 | ||
442 | if (devp->hd_flags & HPET_PERIODIC) { | |
443 | write_counter(t, &timer->hpet_compare); | |
444 | g |= Tn_TYPE_CNF_MASK; | |
445 | v |= Tn_TYPE_CNF_MASK; | |
446 | writeq(v, &timer->hpet_config); | |
447 | v |= Tn_VAL_SET_CNF_MASK; | |
448 | writeq(v, &timer->hpet_config); | |
449 | local_irq_save(flags); | |
450 | m = read_counter(&hpet->hpet_mc); | |
451 | write_counter(t + m + hpetp->hp_delta, &timer->hpet_compare); | |
452 | } else { | |
453 | local_irq_save(flags); | |
454 | m = read_counter(&hpet->hpet_mc); | |
455 | write_counter(t + m + hpetp->hp_delta, &timer->hpet_compare); | |
456 | } | |
457 | ||
0d290861 | 458 | if (devp->hd_flags & HPET_SHARED_IRQ) { |
3d5640d1 | 459 | isr = 1 << (devp - devp->hd_hpets->hp_dev); |
0d290861 CL |
460 | writel(isr, &hpet->hpet_isr); |
461 | } | |
1da177e4 LT |
462 | writeq(g, &timer->hpet_config); |
463 | local_irq_restore(flags); | |
464 | ||
465 | return 0; | |
466 | } | |
467 | ||
ba3f213f CL |
468 | /* converts Hz to number of timer ticks */ |
469 | static inline unsigned long hpet_time_div(struct hpets *hpets, | |
470 | unsigned long dis) | |
1da177e4 | 471 | { |
ba3f213f | 472 | unsigned long long m; |
1da177e4 | 473 | |
ba3f213f | 474 | m = hpets->hp_tick_freq + (dis >> 1); |
1da177e4 | 475 | do_div(m, dis); |
1da177e4 LT |
476 | return (unsigned long)m; |
477 | } | |
478 | ||
479 | static int | |
480 | hpet_ioctl_common(struct hpet_dev *devp, int cmd, unsigned long arg, int kernel) | |
481 | { | |
482 | struct hpet_timer __iomem *timer; | |
483 | struct hpet __iomem *hpet; | |
484 | struct hpets *hpetp; | |
485 | int err; | |
486 | unsigned long v; | |
487 | ||
488 | switch (cmd) { | |
489 | case HPET_IE_OFF: | |
490 | case HPET_INFO: | |
491 | case HPET_EPI: | |
492 | case HPET_DPI: | |
493 | case HPET_IRQFREQ: | |
494 | timer = devp->hd_timer; | |
495 | hpet = devp->hd_hpet; | |
496 | hpetp = devp->hd_hpets; | |
497 | break; | |
498 | case HPET_IE_ON: | |
499 | return hpet_ioctl_ieon(devp); | |
500 | default: | |
501 | return -EINVAL; | |
502 | } | |
503 | ||
504 | err = 0; | |
505 | ||
506 | switch (cmd) { | |
507 | case HPET_IE_OFF: | |
508 | if ((devp->hd_flags & HPET_IE) == 0) | |
509 | break; | |
510 | v = readq(&timer->hpet_config); | |
511 | v &= ~Tn_INT_ENB_CNF_MASK; | |
512 | writeq(v, &timer->hpet_config); | |
513 | if (devp->hd_irq) { | |
514 | free_irq(devp->hd_irq, devp); | |
515 | devp->hd_irq = 0; | |
516 | } | |
517 | devp->hd_flags ^= HPET_IE; | |
518 | break; | |
519 | case HPET_INFO: | |
520 | { | |
521 | struct hpet_info info; | |
522 | ||
af95eade CL |
523 | if (devp->hd_ireqfreq) |
524 | info.hi_ireqfreq = | |
525 | hpet_time_div(hpetp, devp->hd_ireqfreq); | |
526 | else | |
527 | info.hi_ireqfreq = 0; | |
1da177e4 LT |
528 | info.hi_flags = |
529 | readq(&timer->hpet_config) & Tn_PER_INT_CAP_MASK; | |
c860ed9f CL |
530 | info.hi_hpet = hpetp->hp_which; |
531 | info.hi_timer = devp - hpetp->hp_dev; | |
8e8505be CL |
532 | if (kernel) |
533 | memcpy((void *)arg, &info, sizeof(info)); | |
534 | else | |
535 | if (copy_to_user((void __user *)arg, &info, | |
536 | sizeof(info))) | |
537 | err = -EFAULT; | |
1da177e4 LT |
538 | break; |
539 | } | |
540 | case HPET_EPI: | |
541 | v = readq(&timer->hpet_config); | |
542 | if ((v & Tn_PER_INT_CAP_MASK) == 0) { | |
543 | err = -ENXIO; | |
544 | break; | |
545 | } | |
546 | devp->hd_flags |= HPET_PERIODIC; | |
547 | break; | |
548 | case HPET_DPI: | |
549 | v = readq(&timer->hpet_config); | |
550 | if ((v & Tn_PER_INT_CAP_MASK) == 0) { | |
551 | err = -ENXIO; | |
552 | break; | |
553 | } | |
554 | if (devp->hd_flags & HPET_PERIODIC && | |
555 | readq(&timer->hpet_config) & Tn_TYPE_CNF_MASK) { | |
556 | v = readq(&timer->hpet_config); | |
557 | v ^= Tn_TYPE_CNF_MASK; | |
558 | writeq(v, &timer->hpet_config); | |
559 | } | |
560 | devp->hd_flags &= ~HPET_PERIODIC; | |
561 | break; | |
562 | case HPET_IRQFREQ: | |
563 | if (!kernel && (arg > hpet_max_freq) && | |
564 | !capable(CAP_SYS_RESOURCE)) { | |
565 | err = -EACCES; | |
566 | break; | |
567 | } | |
568 | ||
189e2dd1 | 569 | if (!arg) { |
1da177e4 LT |
570 | err = -EINVAL; |
571 | break; | |
572 | } | |
573 | ||
ba3f213f | 574 | devp->hd_ireqfreq = hpet_time_div(hpetp, arg); |
1da177e4 LT |
575 | } |
576 | ||
577 | return err; | |
578 | } | |
579 | ||
62322d25 | 580 | static const struct file_operations hpet_fops = { |
1da177e4 LT |
581 | .owner = THIS_MODULE, |
582 | .llseek = no_llseek, | |
583 | .read = hpet_read, | |
584 | .poll = hpet_poll, | |
585 | .ioctl = hpet_ioctl, | |
586 | .open = hpet_open, | |
587 | .release = hpet_release, | |
588 | .fasync = hpet_fasync, | |
589 | .mmap = hpet_mmap, | |
590 | }; | |
591 | ||
3e6716e7 RD |
592 | static int hpet_is_known(struct hpet_data *hdp) |
593 | { | |
594 | struct hpets *hpetp; | |
595 | ||
596 | for (hpetp = hpets; hpetp; hpetp = hpetp->hp_next) | |
597 | if (hpetp->hp_hpet_phys == hdp->hd_phys_address) | |
598 | return 1; | |
599 | ||
600 | return 0; | |
601 | } | |
602 | ||
1da177e4 LT |
603 | static inline int hpet_tpcheck(struct hpet_task *tp) |
604 | { | |
605 | struct hpet_dev *devp; | |
606 | struct hpets *hpetp; | |
607 | ||
608 | devp = tp->ht_opaque; | |
609 | ||
610 | if (!devp) | |
611 | return -ENXIO; | |
612 | ||
613 | for (hpetp = hpets; hpetp; hpetp = hpetp->hp_next) | |
614 | if (devp >= hpetp->hp_dev | |
615 | && devp < (hpetp->hp_dev + hpetp->hp_ntimer) | |
616 | && devp->hd_hpet == hpetp->hp_hpet) | |
617 | return 0; | |
618 | ||
619 | return -ENXIO; | |
620 | } | |
621 | ||
622 | int hpet_unregister(struct hpet_task *tp) | |
623 | { | |
624 | struct hpet_dev *devp; | |
625 | struct hpet_timer __iomem *timer; | |
626 | int err; | |
627 | ||
628 | if ((err = hpet_tpcheck(tp))) | |
629 | return err; | |
630 | ||
631 | spin_lock_irq(&hpet_task_lock); | |
632 | spin_lock(&hpet_lock); | |
633 | ||
634 | devp = tp->ht_opaque; | |
635 | if (devp->hd_task != tp) { | |
636 | spin_unlock(&hpet_lock); | |
637 | spin_unlock_irq(&hpet_task_lock); | |
638 | return -ENXIO; | |
639 | } | |
640 | ||
641 | timer = devp->hd_timer; | |
642 | writeq((readq(&timer->hpet_config) & ~Tn_INT_ENB_CNF_MASK), | |
643 | &timer->hpet_config); | |
644 | devp->hd_flags &= ~(HPET_IE | HPET_PERIODIC); | |
645 | devp->hd_task = NULL; | |
646 | spin_unlock(&hpet_lock); | |
647 | spin_unlock_irq(&hpet_task_lock); | |
648 | ||
649 | return 0; | |
650 | } | |
651 | ||
1da177e4 LT |
652 | static ctl_table hpet_table[] = { |
653 | { | |
22943364 | 654 | .ctl_name = CTL_UNNUMBERED, |
1da177e4 LT |
655 | .procname = "max-user-freq", |
656 | .data = &hpet_max_freq, | |
657 | .maxlen = sizeof(int), | |
658 | .mode = 0644, | |
659 | .proc_handler = &proc_dointvec, | |
660 | }, | |
661 | {.ctl_name = 0} | |
662 | }; | |
663 | ||
664 | static ctl_table hpet_root[] = { | |
665 | { | |
22943364 | 666 | .ctl_name = CTL_UNNUMBERED, |
1da177e4 LT |
667 | .procname = "hpet", |
668 | .maxlen = 0, | |
669 | .mode = 0555, | |
670 | .child = hpet_table, | |
671 | }, | |
672 | {.ctl_name = 0} | |
673 | }; | |
674 | ||
675 | static ctl_table dev_root[] = { | |
676 | { | |
677 | .ctl_name = CTL_DEV, | |
678 | .procname = "dev", | |
679 | .maxlen = 0, | |
680 | .mode = 0555, | |
681 | .child = hpet_root, | |
682 | }, | |
683 | {.ctl_name = 0} | |
684 | }; | |
685 | ||
686 | static struct ctl_table_header *sysctl_header; | |
687 | ||
1da177e4 LT |
688 | /* |
689 | * Adjustment for when arming the timer with | |
690 | * initial conditions. That is, main counter | |
691 | * ticks expired before interrupts are enabled. | |
692 | */ | |
693 | #define TICK_CALIBRATE (1000UL) | |
694 | ||
695 | static unsigned long hpet_calibrate(struct hpets *hpetp) | |
696 | { | |
697 | struct hpet_timer __iomem *timer = NULL; | |
698 | unsigned long t, m, count, i, flags, start; | |
699 | struct hpet_dev *devp; | |
700 | int j; | |
701 | struct hpet __iomem *hpet; | |
702 | ||
703 | for (j = 0, devp = hpetp->hp_dev; j < hpetp->hp_ntimer; j++, devp++) | |
704 | if ((devp->hd_flags & HPET_OPEN) == 0) { | |
705 | timer = devp->hd_timer; | |
706 | break; | |
707 | } | |
708 | ||
709 | if (!timer) | |
710 | return 0; | |
711 | ||
3d5640d1 | 712 | hpet = hpetp->hp_hpet; |
1da177e4 LT |
713 | t = read_counter(&timer->hpet_compare); |
714 | ||
715 | i = 0; | |
ba3f213f | 716 | count = hpet_time_div(hpetp, TICK_CALIBRATE); |
1da177e4 LT |
717 | |
718 | local_irq_save(flags); | |
719 | ||
720 | start = read_counter(&hpet->hpet_mc); | |
721 | ||
722 | do { | |
723 | m = read_counter(&hpet->hpet_mc); | |
724 | write_counter(t + m + hpetp->hp_delta, &timer->hpet_compare); | |
725 | } while (i++, (m - start) < count); | |
726 | ||
727 | local_irq_restore(flags); | |
728 | ||
729 | return (m - start) / i; | |
730 | } | |
731 | ||
732 | int hpet_alloc(struct hpet_data *hdp) | |
733 | { | |
5761d64b | 734 | u64 cap, mcfg; |
1da177e4 | 735 | struct hpet_dev *devp; |
5761d64b | 736 | u32 i, ntimer; |
1da177e4 LT |
737 | struct hpets *hpetp; |
738 | size_t siz; | |
739 | struct hpet __iomem *hpet; | |
3e6716e7 | 740 | static struct hpets *last = NULL; |
5761d64b | 741 | unsigned long period; |
ba3f213f | 742 | unsigned long long temp; |
1da177e4 LT |
743 | |
744 | /* | |
745 | * hpet_alloc can be called by platform dependent code. | |
3e6716e7 RD |
746 | * If platform dependent code has allocated the hpet that |
747 | * ACPI has also reported, then we catch it here. | |
1da177e4 | 748 | */ |
3e6716e7 RD |
749 | if (hpet_is_known(hdp)) { |
750 | printk(KERN_DEBUG "%s: duplicate HPET ignored\n", | |
751 | __FUNCTION__); | |
752 | return 0; | |
753 | } | |
1da177e4 LT |
754 | |
755 | siz = sizeof(struct hpets) + ((hdp->hd_nirqs - 1) * | |
756 | sizeof(struct hpet_dev)); | |
757 | ||
3e6716e7 | 758 | hpetp = kzalloc(siz, GFP_KERNEL); |
1da177e4 LT |
759 | |
760 | if (!hpetp) | |
761 | return -ENOMEM; | |
762 | ||
1da177e4 LT |
763 | hpetp->hp_which = hpet_nhpet++; |
764 | hpetp->hp_hpet = hdp->hd_address; | |
765 | hpetp->hp_hpet_phys = hdp->hd_phys_address; | |
766 | ||
767 | hpetp->hp_ntimer = hdp->hd_nirqs; | |
e3f37a54 | 768 | |
5761d64b TG |
769 | for (i = 0; i < hdp->hd_nirqs; i++) |
770 | hpetp->hp_dev[i].hd_hdwirq = hdp->hd_irq[i]; | |
37a47db8 | 771 | |
5761d64b | 772 | hpet = hpetp->hp_hpet; |
e3f37a54 | 773 | |
1da177e4 LT |
774 | cap = readq(&hpet->hpet_cap); |
775 | ||
776 | ntimer = ((cap & HPET_NUM_TIM_CAP_MASK) >> HPET_NUM_TIM_CAP_SHIFT) + 1; | |
777 | ||
778 | if (hpetp->hp_ntimer != ntimer) { | |
779 | printk(KERN_WARNING "hpet: number irqs doesn't agree" | |
780 | " with number of timers\n"); | |
781 | kfree(hpetp); | |
782 | return -ENODEV; | |
783 | } | |
784 | ||
785 | if (last) | |
786 | last->hp_next = hpetp; | |
787 | else | |
788 | hpets = hpetp; | |
789 | ||
790 | last = hpetp; | |
791 | ||
ba3f213f CL |
792 | period = (cap & HPET_COUNTER_CLK_PERIOD_MASK) >> |
793 | HPET_COUNTER_CLK_PERIOD_SHIFT; /* fs, 10^-15 */ | |
794 | temp = 1000000000000000uLL; /* 10^15 femtoseconds per second */ | |
795 | temp += period >> 1; /* round */ | |
796 | do_div(temp, period); | |
797 | hpetp->hp_tick_freq = temp; /* ticks per second */ | |
1da177e4 | 798 | |
3034d11c AK |
799 | printk(KERN_INFO "hpet%d: at MMIO 0x%lx, IRQ%s", |
800 | hpetp->hp_which, hdp->hd_phys_address, | |
1da177e4 LT |
801 | hpetp->hp_ntimer > 1 ? "s" : ""); |
802 | for (i = 0; i < hpetp->hp_ntimer; i++) | |
5761d64b | 803 | printk("%s %d", i > 0 ? "," : "", hdp->hd_irq[i]); |
1da177e4 LT |
804 | printk("\n"); |
805 | ||
318db8f0 CL |
806 | printk(KERN_INFO "hpet%u: %u %d-bit timers, %Lu Hz\n", |
807 | hpetp->hp_which, hpetp->hp_ntimer, | |
808 | cap & HPET_COUNTER_SIZE_MASK ? 64 : 32, hpetp->hp_tick_freq); | |
1da177e4 LT |
809 | |
810 | mcfg = readq(&hpet->hpet_config); | |
811 | if ((mcfg & HPET_ENABLE_CNF_MASK) == 0) { | |
812 | write_counter(0L, &hpet->hpet_mc); | |
813 | mcfg |= HPET_ENABLE_CNF_MASK; | |
814 | writeq(mcfg, &hpet->hpet_config); | |
815 | } | |
816 | ||
642d30bb | 817 | for (i = 0, devp = hpetp->hp_dev; i < hpetp->hp_ntimer; i++, devp++) { |
1da177e4 LT |
818 | struct hpet_timer __iomem *timer; |
819 | ||
820 | timer = &hpet->hpet_timers[devp - hpetp->hp_dev]; | |
1da177e4 LT |
821 | |
822 | devp->hd_hpets = hpetp; | |
823 | devp->hd_hpet = hpet; | |
824 | devp->hd_timer = timer; | |
825 | ||
826 | /* | |
827 | * If the timer was reserved by platform code, | |
828 | * then make timer unavailable for opens. | |
829 | */ | |
830 | if (hdp->hd_state & (1 << i)) { | |
831 | devp->hd_flags = HPET_OPEN; | |
832 | continue; | |
833 | } | |
834 | ||
835 | init_waitqueue_head(&devp->hd_waitqueue); | |
836 | } | |
837 | ||
838 | hpetp->hp_delta = hpet_calibrate(hpetp); | |
0aa366f3 | 839 | |
3b2b64fd LT |
840 | /* This clocksource driver currently only works on ia64 */ |
841 | #ifdef CONFIG_IA64 | |
0aa366f3 TL |
842 | if (!hpet_clocksource) { |
843 | hpet_mctr = (void __iomem *)&hpetp->hp_hpet->hpet_mc; | |
844 | CLKSRC_FSYS_MMIO_SET(clocksource_hpet.fsys_mmio, hpet_mctr); | |
845 | clocksource_hpet.mult = clocksource_hz2mult(hpetp->hp_tick_freq, | |
846 | clocksource_hpet.shift); | |
847 | clocksource_register(&clocksource_hpet); | |
848 | hpetp->hp_clocksource = &clocksource_hpet; | |
849 | hpet_clocksource = &clocksource_hpet; | |
850 | } | |
3b2b64fd | 851 | #endif |
1da177e4 LT |
852 | |
853 | return 0; | |
854 | } | |
855 | ||
856 | static acpi_status hpet_resources(struct acpi_resource *res, void *data) | |
857 | { | |
858 | struct hpet_data *hdp; | |
859 | acpi_status status; | |
860 | struct acpi_resource_address64 addr; | |
1da177e4 LT |
861 | |
862 | hdp = data; | |
863 | ||
864 | status = acpi_resource_to_address64(res, &addr); | |
865 | ||
866 | if (ACPI_SUCCESS(status)) { | |
50eca3eb | 867 | hdp->hd_phys_address = addr.minimum; |
9224a867 | 868 | hdp->hd_address = ioremap(addr.minimum, addr.address_length); |
1da177e4 | 869 | |
3e6716e7 RD |
870 | if (hpet_is_known(hdp)) { |
871 | printk(KERN_DEBUG "%s: 0x%lx is busy\n", | |
872 | __FUNCTION__, hdp->hd_phys_address); | |
873 | iounmap(hdp->hd_address); | |
78e1ca49 | 874 | return AE_ALREADY_EXISTS; |
3e6716e7 | 875 | } |
50eca3eb BM |
876 | } else if (res->type == ACPI_RESOURCE_TYPE_FIXED_MEMORY32) { |
877 | struct acpi_resource_fixed_memory32 *fixmem32; | |
757c4724 RD |
878 | |
879 | fixmem32 = &res->data.fixed_memory32; | |
880 | if (!fixmem32) | |
78e1ca49 | 881 | return AE_NO_MEMORY; |
757c4724 | 882 | |
50eca3eb BM |
883 | hdp->hd_phys_address = fixmem32->address; |
884 | hdp->hd_address = ioremap(fixmem32->address, | |
757c4724 RD |
885 | HPET_RANGE_SIZE); |
886 | ||
3e6716e7 RD |
887 | if (hpet_is_known(hdp)) { |
888 | printk(KERN_DEBUG "%s: 0x%lx is busy\n", | |
889 | __FUNCTION__, hdp->hd_phys_address); | |
890 | iounmap(hdp->hd_address); | |
78e1ca49 | 891 | return AE_ALREADY_EXISTS; |
3e6716e7 | 892 | } |
50eca3eb BM |
893 | } else if (res->type == ACPI_RESOURCE_TYPE_EXTENDED_IRQ) { |
894 | struct acpi_resource_extended_irq *irqp; | |
be5efffb | 895 | int i, irq; |
1da177e4 LT |
896 | |
897 | irqp = &res->data.extended_irq; | |
898 | ||
be5efffb BH |
899 | for (i = 0; i < irqp->interrupt_count; i++) { |
900 | irq = acpi_register_gsi(irqp->interrupts[i], | |
901 | irqp->triggering, irqp->polarity); | |
902 | if (irq < 0) | |
903 | return AE_ERROR; | |
904 | ||
905 | hdp->hd_irq[hdp->hd_nirqs] = irq; | |
906 | hdp->hd_nirqs++; | |
1da177e4 LT |
907 | } |
908 | } | |
909 | ||
910 | return AE_OK; | |
911 | } | |
912 | ||
913 | static int hpet_acpi_add(struct acpi_device *device) | |
914 | { | |
915 | acpi_status result; | |
916 | struct hpet_data data; | |
917 | ||
918 | memset(&data, 0, sizeof(data)); | |
919 | ||
920 | result = | |
921 | acpi_walk_resources(device->handle, METHOD_NAME__CRS, | |
922 | hpet_resources, &data); | |
923 | ||
924 | if (ACPI_FAILURE(result)) | |
925 | return -ENODEV; | |
926 | ||
927 | if (!data.hd_address || !data.hd_nirqs) { | |
928 | printk("%s: no address or irqs in _CRS\n", __FUNCTION__); | |
929 | return -ENODEV; | |
930 | } | |
931 | ||
932 | return hpet_alloc(&data); | |
933 | } | |
934 | ||
935 | static int hpet_acpi_remove(struct acpi_device *device, int type) | |
936 | { | |
0aa366f3 | 937 | /* XXX need to unregister clocksource, dealloc mem, etc */ |
1da177e4 LT |
938 | return -EINVAL; |
939 | } | |
940 | ||
1ba90e3a TR |
941 | static const struct acpi_device_id hpet_device_ids[] = { |
942 | {"PNP0103", 0}, | |
943 | {"", 0}, | |
944 | }; | |
945 | MODULE_DEVICE_TABLE(acpi, hpet_device_ids); | |
946 | ||
1da177e4 LT |
947 | static struct acpi_driver hpet_acpi_driver = { |
948 | .name = "hpet", | |
1ba90e3a | 949 | .ids = hpet_device_ids, |
1da177e4 LT |
950 | .ops = { |
951 | .add = hpet_acpi_add, | |
952 | .remove = hpet_acpi_remove, | |
953 | }, | |
954 | }; | |
955 | ||
956 | static struct miscdevice hpet_misc = { HPET_MINOR, "hpet", &hpet_fops }; | |
957 | ||
958 | static int __init hpet_init(void) | |
959 | { | |
960 | int result; | |
961 | ||
962 | result = misc_register(&hpet_misc); | |
963 | if (result < 0) | |
964 | return -ENODEV; | |
965 | ||
0b4d4147 | 966 | sysctl_header = register_sysctl_table(dev_root); |
1da177e4 LT |
967 | |
968 | result = acpi_bus_register_driver(&hpet_acpi_driver); | |
969 | if (result < 0) { | |
970 | if (sysctl_header) | |
971 | unregister_sysctl_table(sysctl_header); | |
972 | misc_deregister(&hpet_misc); | |
973 | return result; | |
974 | } | |
975 | ||
976 | return 0; | |
977 | } | |
978 | ||
979 | static void __exit hpet_exit(void) | |
980 | { | |
981 | acpi_bus_unregister_driver(&hpet_acpi_driver); | |
982 | ||
983 | if (sysctl_header) | |
984 | unregister_sysctl_table(sysctl_header); | |
985 | misc_deregister(&hpet_misc); | |
986 | ||
987 | return; | |
988 | } | |
989 | ||
990 | module_init(hpet_init); | |
991 | module_exit(hpet_exit); | |
992 | MODULE_AUTHOR("Bob Picco <Robert.Picco@hp.com>"); | |
993 | MODULE_LICENSE("GPL"); |