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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 | |
0aa366f3 TL |
65 | static void __iomem *hpet_mctr; |
66 | ||
67 | static cycle_t read_hpet(void) | |
68 | { | |
69 | return (cycle_t)read_counter((void __iomem *)hpet_mctr); | |
70 | } | |
71 | ||
72 | static 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 | }; | |
81 | static struct clocksource *hpet_clocksource; | |
82 | ||
1da177e4 LT |
83 | /* A lock for concurrent access by app and isr hpet activity. */ |
84 | static DEFINE_SPINLOCK(hpet_lock); | |
85 | /* A lock for concurrent intermodule access to hpet and isr hpet activity. */ | |
86 | static DEFINE_SPINLOCK(hpet_task_lock); | |
87 | ||
88 | #define HPET_DEV_NAME (7) | |
89 | ||
90 | struct 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 | ||
105 | struct hpets { | |
106 | struct hpets *hp_next; | |
107 | struct hpet __iomem *hp_hpet; | |
108 | unsigned long hp_hpet_phys; | |
0aa366f3 | 109 | struct clocksource *hp_clocksource; |
ba3f213f | 110 | unsigned long long hp_tick_freq; |
1da177e4 LT |
111 | unsigned long hp_delta; |
112 | unsigned int hp_ntimer; | |
113 | unsigned int hp_which; | |
114 | struct hpet_dev hp_dev[1]; | |
115 | }; | |
116 | ||
117 | static struct hpets *hpets; | |
118 | ||
119 | #define HPET_OPEN 0x0001 | |
120 | #define HPET_IE 0x0002 /* interrupt enabled */ | |
121 | #define HPET_PERIODIC 0x0004 | |
0d290861 | 122 | #define HPET_SHARED_IRQ 0x0008 |
1da177e4 | 123 | |
1da177e4 LT |
124 | |
125 | #ifndef readq | |
887c27f3 | 126 | static inline unsigned long long readq(void __iomem *addr) |
1da177e4 LT |
127 | { |
128 | return readl(addr) | (((unsigned long long)readl(addr + 4)) << 32LL); | |
129 | } | |
130 | #endif | |
131 | ||
132 | #ifndef writeq | |
887c27f3 | 133 | static inline void writeq(unsigned long long v, void __iomem *addr) |
1da177e4 LT |
134 | { |
135 | writel(v & 0xffffffff, addr); | |
136 | writel(v >> 32, addr + 4); | |
137 | } | |
138 | #endif | |
139 | ||
7d12e780 | 140 | static irqreturn_t hpet_interrupt(int irq, void *data) |
1da177e4 LT |
141 | { |
142 | struct hpet_dev *devp; | |
143 | unsigned long isr; | |
144 | ||
145 | devp = data; | |
0d290861 CL |
146 | 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; | |
1da177e4 LT |
151 | |
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 | ||
0d290861 CL |
168 | if (devp->hd_flags & HPET_SHARED_IRQ) |
169 | writel(isr, &devp->hd_hpet->hpet_isr); | |
1da177e4 LT |
170 | 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 | ||
184 | static 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 | ||
218 | static ssize_t | |
219 | hpet_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); | |
258 | out: | |
259 | __set_current_state(TASK_RUNNING); | |
260 | remove_wait_queue(&devp->hd_waitqueue, &wait); | |
261 | ||
262 | return retval; | |
263 | } | |
264 | ||
265 | static 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 | ||
287 | static 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); | |
1da177e4 LT |
304 | |
305 | if (io_remap_pfn_range(vma, vma->vm_start, addr >> PAGE_SHIFT, | |
306 | PAGE_SIZE, vma->vm_page_prot)) { | |
3e6716e7 RD |
307 | printk(KERN_ERR "%s: io_remap_pfn_range failed\n", |
308 | __FUNCTION__); | |
1da177e4 LT |
309 | return -EAGAIN; |
310 | } | |
311 | ||
312 | return 0; | |
313 | #else | |
314 | return -ENOSYS; | |
315 | #endif | |
316 | } | |
317 | ||
318 | static 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 | ||
330 | static 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 | ||
371 | static int hpet_ioctl_common(struct hpet_dev *, int, unsigned long, int); | |
372 | ||
373 | static int | |
374 | hpet_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 | ||
383 | static 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 | ||
9090e6db CL |
396 | if (!devp->hd_ireqfreq) |
397 | return -EIO; | |
398 | ||
1da177e4 LT |
399 | 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; | |
0d290861 CL |
407 | |
408 | if (readl(&timer->hpet_config) & Tn_INT_TYPE_CNF_MASK) | |
409 | devp->hd_flags |= HPET_SHARED_IRQ; | |
1da177e4 LT |
410 | spin_unlock_irq(&hpet_lock); |
411 | ||
1da177e4 LT |
412 | irq = devp->hd_hdwirq; |
413 | ||
414 | if (irq) { | |
0d290861 | 415 | unsigned long irq_flags; |
1da177e4 | 416 | |
0d290861 CL |
417 | sprintf(devp->hd_name, "hpet%d", (int)(devp - hpetp->hp_dev)); |
418 | irq_flags = devp->hd_flags & HPET_SHARED_IRQ | |
0f2ed4c6 | 419 | ? IRQF_SHARED : IRQF_DISABLED; |
0d290861 CL |
420 | if (request_irq(irq, hpet_interrupt, irq_flags, |
421 | devp->hd_name, (void *)devp)) { | |
1da177e4 LT |
422 | 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 | ||
0d290861 | 455 | if (devp->hd_flags & HPET_SHARED_IRQ) { |
3d5640d1 | 456 | isr = 1 << (devp - devp->hd_hpets->hp_dev); |
0d290861 CL |
457 | writel(isr, &hpet->hpet_isr); |
458 | } | |
1da177e4 LT |
459 | writeq(g, &timer->hpet_config); |
460 | local_irq_restore(flags); | |
461 | ||
462 | return 0; | |
463 | } | |
464 | ||
ba3f213f CL |
465 | /* converts Hz to number of timer ticks */ |
466 | static inline unsigned long hpet_time_div(struct hpets *hpets, | |
467 | unsigned long dis) | |
1da177e4 | 468 | { |
ba3f213f | 469 | unsigned long long m; |
1da177e4 | 470 | |
ba3f213f | 471 | m = hpets->hp_tick_freq + (dis >> 1); |
1da177e4 | 472 | do_div(m, dis); |
1da177e4 LT |
473 | return (unsigned long)m; |
474 | } | |
475 | ||
476 | static int | |
477 | hpet_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 | ||
af95eade CL |
520 | if (devp->hd_ireqfreq) |
521 | info.hi_ireqfreq = | |
522 | hpet_time_div(hpetp, devp->hd_ireqfreq); | |
523 | else | |
524 | info.hi_ireqfreq = 0; | |
1da177e4 LT |
525 | info.hi_flags = |
526 | readq(&timer->hpet_config) & Tn_PER_INT_CAP_MASK; | |
c860ed9f CL |
527 | info.hi_hpet = hpetp->hp_which; |
528 | info.hi_timer = devp - hpetp->hp_dev; | |
8e8505be CL |
529 | 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; | |
1da177e4 LT |
535 | 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 | ||
189e2dd1 | 566 | if (!arg) { |
1da177e4 LT |
567 | err = -EINVAL; |
568 | break; | |
569 | } | |
570 | ||
ba3f213f | 571 | devp->hd_ireqfreq = hpet_time_div(hpetp, arg); |
1da177e4 LT |
572 | } |
573 | ||
574 | return err; | |
575 | } | |
576 | ||
62322d25 | 577 | static const struct file_operations hpet_fops = { |
1da177e4 LT |
578 | .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 | ||
3e6716e7 RD |
589 | static 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 | ||
1da177e4 LT |
600 | EXPORT_SYMBOL(hpet_alloc); |
601 | EXPORT_SYMBOL(hpet_register); | |
602 | EXPORT_SYMBOL(hpet_unregister); | |
603 | EXPORT_SYMBOL(hpet_control); | |
604 | ||
605 | int 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 | ||
7522e4ec CL |
624 | tp->ht_opaque = NULL; |
625 | ||
1da177e4 LT |
626 | 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 | ||
657 | static 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 | ||
676 | int 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 | ||
706 | int 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 | ||
724 | static ctl_table hpet_table[] = { | |
725 | { | |
22943364 | 726 | .ctl_name = CTL_UNNUMBERED, |
1da177e4 LT |
727 | .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 | ||
736 | static ctl_table hpet_root[] = { | |
737 | { | |
22943364 | 738 | .ctl_name = CTL_UNNUMBERED, |
1da177e4 LT |
739 | .procname = "hpet", |
740 | .maxlen = 0, | |
741 | .mode = 0555, | |
742 | .child = hpet_table, | |
743 | }, | |
744 | {.ctl_name = 0} | |
745 | }; | |
746 | ||
747 | static 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 | ||
758 | static struct ctl_table_header *sysctl_header; | |
759 | ||
1da177e4 LT |
760 | /* |
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 | ||
767 | static 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 | ||
3d5640d1 | 784 | hpet = hpetp->hp_hpet; |
1da177e4 LT |
785 | t = read_counter(&timer->hpet_compare); |
786 | ||
787 | i = 0; | |
ba3f213f | 788 | count = hpet_time_div(hpetp, TICK_CALIBRATE); |
1da177e4 LT |
789 | |
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 | ||
804 | int 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; | |
3e6716e7 | 812 | static struct hpets *last = NULL; |
318db8f0 | 813 | unsigned long period; |
ba3f213f | 814 | unsigned long long temp; |
1da177e4 LT |
815 | |
816 | /* | |
817 | * hpet_alloc can be called by platform dependent code. | |
3e6716e7 RD |
818 | * If platform dependent code has allocated the hpet that |
819 | * ACPI has also reported, then we catch it here. | |
1da177e4 | 820 | */ |
3e6716e7 RD |
821 | if (hpet_is_known(hdp)) { |
822 | printk(KERN_DEBUG "%s: duplicate HPET ignored\n", | |
823 | __FUNCTION__); | |
824 | return 0; | |
825 | } | |
1da177e4 LT |
826 | |
827 | siz = sizeof(struct hpets) + ((hdp->hd_nirqs - 1) * | |
828 | sizeof(struct hpet_dev)); | |
829 | ||
3e6716e7 | 830 | hpetp = kzalloc(siz, GFP_KERNEL); |
1da177e4 LT |
831 | |
832 | if (!hpetp) | |
833 | return -ENOMEM; | |
834 | ||
1da177e4 LT |
835 | 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 | ||
ba3f213f CL |
864 | 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 */ | |
1da177e4 | 870 | |
3034d11c AK |
871 | printk(KERN_INFO "hpet%d: at MMIO 0x%lx, IRQ%s", |
872 | hpetp->hp_which, hdp->hd_phys_address, | |
1da177e4 LT |
873 | 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 | ||
318db8f0 CL |
878 | 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); | |
1da177e4 LT |
881 | |
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 | ||
642d30bb | 889 | for (i = 0, devp = hpetp->hp_dev; i < hpetp->hp_ntimer; i++, devp++) { |
1da177e4 LT |
890 | struct hpet_timer __iomem *timer; |
891 | ||
892 | timer = &hpet->hpet_timers[devp - hpetp->hp_dev]; | |
1da177e4 LT |
893 | |
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); | |
0aa366f3 TL |
911 | |
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 | } | |
1da177e4 LT |
921 | |
922 | return 0; | |
923 | } | |
924 | ||
925 | static 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; | |
1da177e4 LT |
930 | |
931 | hdp = data; | |
932 | ||
933 | status = acpi_resource_to_address64(res, &addr); | |
934 | ||
935 | if (ACPI_SUCCESS(status)) { | |
50eca3eb | 936 | hdp->hd_phys_address = addr.minimum; |
9224a867 | 937 | hdp->hd_address = ioremap(addr.minimum, addr.address_length); |
1da177e4 | 938 | |
3e6716e7 RD |
939 | 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 | } | |
50eca3eb BM |
945 | } else if (res->type == ACPI_RESOURCE_TYPE_FIXED_MEMORY32) { |
946 | struct acpi_resource_fixed_memory32 *fixmem32; | |
757c4724 RD |
947 | |
948 | fixmem32 = &res->data.fixed_memory32; | |
949 | if (!fixmem32) | |
950 | return -EINVAL; | |
951 | ||
50eca3eb BM |
952 | hdp->hd_phys_address = fixmem32->address; |
953 | hdp->hd_address = ioremap(fixmem32->address, | |
757c4724 RD |
954 | HPET_RANGE_SIZE); |
955 | ||
3e6716e7 RD |
956 | 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 | } | |
50eca3eb BM |
962 | } else if (res->type == ACPI_RESOURCE_TYPE_EXTENDED_IRQ) { |
963 | struct acpi_resource_extended_irq *irqp; | |
be5efffb | 964 | int i, irq; |
1da177e4 LT |
965 | |
966 | irqp = &res->data.extended_irq; | |
967 | ||
be5efffb BH |
968 | 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; | |
973 | ||
974 | hdp->hd_irq[hdp->hd_nirqs] = irq; | |
975 | hdp->hd_nirqs++; | |
1da177e4 LT |
976 | } |
977 | } | |
978 | ||
979 | return AE_OK; | |
980 | } | |
981 | ||
982 | static 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 | ||
1004 | static int hpet_acpi_remove(struct acpi_device *device, int type) | |
1005 | { | |
0aa366f3 | 1006 | /* XXX need to unregister clocksource, dealloc mem, etc */ |
1da177e4 LT |
1007 | return -EINVAL; |
1008 | } | |
1009 | ||
1ba90e3a TR |
1010 | static const struct acpi_device_id hpet_device_ids[] = { |
1011 | {"PNP0103", 0}, | |
1012 | {"", 0}, | |
1013 | }; | |
1014 | MODULE_DEVICE_TABLE(acpi, hpet_device_ids); | |
1015 | ||
1da177e4 LT |
1016 | static struct acpi_driver hpet_acpi_driver = { |
1017 | .name = "hpet", | |
1ba90e3a | 1018 | .ids = hpet_device_ids, |
1da177e4 LT |
1019 | .ops = { |
1020 | .add = hpet_acpi_add, | |
1021 | .remove = hpet_acpi_remove, | |
1022 | }, | |
1023 | }; | |
1024 | ||
1025 | static struct miscdevice hpet_misc = { HPET_MINOR, "hpet", &hpet_fops }; | |
1026 | ||
1027 | static int __init hpet_init(void) | |
1028 | { | |
1029 | int result; | |
1030 | ||
1031 | result = misc_register(&hpet_misc); | |
1032 | if (result < 0) | |
1033 | return -ENODEV; | |
1034 | ||
0b4d4147 | 1035 | sysctl_header = register_sysctl_table(dev_root); |
1da177e4 LT |
1036 | |
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 | ||
1048 | static 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 | ||
1059 | module_init(hpet_init); | |
1060 | module_exit(hpet_exit); | |
1061 | MODULE_AUTHOR("Bob Picco <Robert.Picco@hp.com>"); | |
1062 | MODULE_LICENSE("GPL"); |