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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 | ||
14 | #include <linux/config.h> | |
15 | #include <linux/interrupt.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/kernel.h> | |
18 | #include <linux/types.h> | |
19 | #include <linux/miscdevice.h> | |
20 | #include <linux/major.h> | |
21 | #include <linux/ioport.h> | |
22 | #include <linux/fcntl.h> | |
23 | #include <linux/init.h> | |
24 | #include <linux/poll.h> | |
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> | |
32 | ||
33 | #include <asm/current.h> | |
34 | #include <asm/uaccess.h> | |
35 | #include <asm/system.h> | |
36 | #include <asm/io.h> | |
37 | #include <asm/irq.h> | |
38 | #include <asm/div64.h> | |
39 | ||
40 | #include <linux/acpi.h> | |
41 | #include <acpi/acpi_bus.h> | |
42 | #include <linux/hpet.h> | |
43 | ||
44 | /* | |
45 | * The High Precision Event Timer driver. | |
46 | * This driver is closely modelled after the rtc.c driver. | |
96803820 | 47 | * http://www.intel.com/hardwaredesign/hpetspec.htm |
1da177e4 LT |
48 | */ |
49 | #define HPET_USER_FREQ (64) | |
50 | #define HPET_DRIFT (500) | |
51 | ||
52 | static u32 hpet_ntimer, hpet_nhpet, hpet_max_freq = HPET_USER_FREQ; | |
53 | ||
54 | /* A lock for concurrent access by app and isr hpet activity. */ | |
55 | static DEFINE_SPINLOCK(hpet_lock); | |
56 | /* A lock for concurrent intermodule access to hpet and isr hpet activity. */ | |
57 | static DEFINE_SPINLOCK(hpet_task_lock); | |
58 | ||
59 | #define HPET_DEV_NAME (7) | |
60 | ||
61 | struct hpet_dev { | |
62 | struct hpets *hd_hpets; | |
63 | struct hpet __iomem *hd_hpet; | |
64 | struct hpet_timer __iomem *hd_timer; | |
65 | unsigned long hd_ireqfreq; | |
66 | unsigned long hd_irqdata; | |
67 | wait_queue_head_t hd_waitqueue; | |
68 | struct fasync_struct *hd_async_queue; | |
69 | struct hpet_task *hd_task; | |
70 | unsigned int hd_flags; | |
71 | unsigned int hd_irq; | |
72 | unsigned int hd_hdwirq; | |
73 | char hd_name[HPET_DEV_NAME]; | |
74 | }; | |
75 | ||
76 | struct hpets { | |
77 | struct hpets *hp_next; | |
78 | struct hpet __iomem *hp_hpet; | |
79 | unsigned long hp_hpet_phys; | |
80 | struct time_interpolator *hp_interpolator; | |
81 | unsigned long hp_period; | |
82 | unsigned long hp_delta; | |
83 | unsigned int hp_ntimer; | |
84 | unsigned int hp_which; | |
85 | struct hpet_dev hp_dev[1]; | |
86 | }; | |
87 | ||
88 | static struct hpets *hpets; | |
89 | ||
90 | #define HPET_OPEN 0x0001 | |
91 | #define HPET_IE 0x0002 /* interrupt enabled */ | |
92 | #define HPET_PERIODIC 0x0004 | |
93 | ||
94 | #if BITS_PER_LONG == 64 | |
95 | #define write_counter(V, MC) writeq(V, MC) | |
96 | #define read_counter(MC) readq(MC) | |
97 | #else | |
98 | #define write_counter(V, MC) writel(V, MC) | |
99 | #define read_counter(MC) readl(MC) | |
100 | #endif | |
101 | ||
102 | #ifndef readq | |
887c27f3 | 103 | static inline unsigned long long readq(void __iomem *addr) |
1da177e4 LT |
104 | { |
105 | return readl(addr) | (((unsigned long long)readl(addr + 4)) << 32LL); | |
106 | } | |
107 | #endif | |
108 | ||
109 | #ifndef writeq | |
887c27f3 | 110 | static inline void writeq(unsigned long long v, void __iomem *addr) |
1da177e4 LT |
111 | { |
112 | writel(v & 0xffffffff, addr); | |
113 | writel(v >> 32, addr + 4); | |
114 | } | |
115 | #endif | |
116 | ||
117 | static irqreturn_t hpet_interrupt(int irq, void *data, struct pt_regs *regs) | |
118 | { | |
119 | struct hpet_dev *devp; | |
120 | unsigned long isr; | |
121 | ||
122 | devp = data; | |
123 | ||
124 | spin_lock(&hpet_lock); | |
125 | devp->hd_irqdata++; | |
126 | ||
127 | /* | |
128 | * For non-periodic timers, increment the accumulator. | |
129 | * This has the effect of treating non-periodic like periodic. | |
130 | */ | |
131 | if ((devp->hd_flags & (HPET_IE | HPET_PERIODIC)) == HPET_IE) { | |
132 | unsigned long m, t; | |
133 | ||
134 | t = devp->hd_ireqfreq; | |
135 | m = read_counter(&devp->hd_hpet->hpet_mc); | |
136 | write_counter(t + m + devp->hd_hpets->hp_delta, | |
137 | &devp->hd_timer->hpet_compare); | |
138 | } | |
139 | ||
140 | isr = (1 << (devp - devp->hd_hpets->hp_dev)); | |
141 | writeq(isr, &devp->hd_hpet->hpet_isr); | |
142 | spin_unlock(&hpet_lock); | |
143 | ||
144 | spin_lock(&hpet_task_lock); | |
145 | if (devp->hd_task) | |
146 | devp->hd_task->ht_func(devp->hd_task->ht_data); | |
147 | spin_unlock(&hpet_task_lock); | |
148 | ||
149 | wake_up_interruptible(&devp->hd_waitqueue); | |
150 | ||
151 | kill_fasync(&devp->hd_async_queue, SIGIO, POLL_IN); | |
152 | ||
153 | return IRQ_HANDLED; | |
154 | } | |
155 | ||
156 | static int hpet_open(struct inode *inode, struct file *file) | |
157 | { | |
158 | struct hpet_dev *devp; | |
159 | struct hpets *hpetp; | |
160 | int i; | |
161 | ||
162 | if (file->f_mode & FMODE_WRITE) | |
163 | return -EINVAL; | |
164 | ||
165 | spin_lock_irq(&hpet_lock); | |
166 | ||
167 | for (devp = NULL, hpetp = hpets; hpetp && !devp; hpetp = hpetp->hp_next) | |
168 | for (i = 0; i < hpetp->hp_ntimer; i++) | |
169 | if (hpetp->hp_dev[i].hd_flags & HPET_OPEN | |
170 | || hpetp->hp_dev[i].hd_task) | |
171 | continue; | |
172 | else { | |
173 | devp = &hpetp->hp_dev[i]; | |
174 | break; | |
175 | } | |
176 | ||
177 | if (!devp) { | |
178 | spin_unlock_irq(&hpet_lock); | |
179 | return -EBUSY; | |
180 | } | |
181 | ||
182 | file->private_data = devp; | |
183 | devp->hd_irqdata = 0; | |
184 | devp->hd_flags |= HPET_OPEN; | |
185 | spin_unlock_irq(&hpet_lock); | |
186 | ||
187 | return 0; | |
188 | } | |
189 | ||
190 | static ssize_t | |
191 | hpet_read(struct file *file, char __user *buf, size_t count, loff_t * ppos) | |
192 | { | |
193 | DECLARE_WAITQUEUE(wait, current); | |
194 | unsigned long data; | |
195 | ssize_t retval; | |
196 | struct hpet_dev *devp; | |
197 | ||
198 | devp = file->private_data; | |
199 | if (!devp->hd_ireqfreq) | |
200 | return -EIO; | |
201 | ||
202 | if (count < sizeof(unsigned long)) | |
203 | return -EINVAL; | |
204 | ||
205 | add_wait_queue(&devp->hd_waitqueue, &wait); | |
206 | ||
207 | for ( ; ; ) { | |
208 | set_current_state(TASK_INTERRUPTIBLE); | |
209 | ||
210 | spin_lock_irq(&hpet_lock); | |
211 | data = devp->hd_irqdata; | |
212 | devp->hd_irqdata = 0; | |
213 | spin_unlock_irq(&hpet_lock); | |
214 | ||
215 | if (data) | |
216 | break; | |
217 | else if (file->f_flags & O_NONBLOCK) { | |
218 | retval = -EAGAIN; | |
219 | goto out; | |
220 | } else if (signal_pending(current)) { | |
221 | retval = -ERESTARTSYS; | |
222 | goto out; | |
223 | } | |
224 | schedule(); | |
225 | } | |
226 | ||
227 | retval = put_user(data, (unsigned long __user *)buf); | |
228 | if (!retval) | |
229 | retval = sizeof(unsigned long); | |
230 | out: | |
231 | __set_current_state(TASK_RUNNING); | |
232 | remove_wait_queue(&devp->hd_waitqueue, &wait); | |
233 | ||
234 | return retval; | |
235 | } | |
236 | ||
237 | static unsigned int hpet_poll(struct file *file, poll_table * wait) | |
238 | { | |
239 | unsigned long v; | |
240 | struct hpet_dev *devp; | |
241 | ||
242 | devp = file->private_data; | |
243 | ||
244 | if (!devp->hd_ireqfreq) | |
245 | return 0; | |
246 | ||
247 | poll_wait(file, &devp->hd_waitqueue, wait); | |
248 | ||
249 | spin_lock_irq(&hpet_lock); | |
250 | v = devp->hd_irqdata; | |
251 | spin_unlock_irq(&hpet_lock); | |
252 | ||
253 | if (v != 0) | |
254 | return POLLIN | POLLRDNORM; | |
255 | ||
256 | return 0; | |
257 | } | |
258 | ||
259 | static int hpet_mmap(struct file *file, struct vm_area_struct *vma) | |
260 | { | |
261 | #ifdef CONFIG_HPET_MMAP | |
262 | struct hpet_dev *devp; | |
263 | unsigned long addr; | |
264 | ||
265 | if (((vma->vm_end - vma->vm_start) != PAGE_SIZE) || vma->vm_pgoff) | |
266 | return -EINVAL; | |
267 | ||
268 | devp = file->private_data; | |
269 | addr = devp->hd_hpets->hp_hpet_phys; | |
270 | ||
271 | if (addr & (PAGE_SIZE - 1)) | |
272 | return -ENOSYS; | |
273 | ||
274 | vma->vm_flags |= VM_IO; | |
275 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); | |
1da177e4 LT |
276 | |
277 | if (io_remap_pfn_range(vma, vma->vm_start, addr >> PAGE_SHIFT, | |
278 | PAGE_SIZE, vma->vm_page_prot)) { | |
279 | printk(KERN_ERR "remap_pfn_range failed in hpet.c\n"); | |
280 | return -EAGAIN; | |
281 | } | |
282 | ||
283 | return 0; | |
284 | #else | |
285 | return -ENOSYS; | |
286 | #endif | |
287 | } | |
288 | ||
289 | static int hpet_fasync(int fd, struct file *file, int on) | |
290 | { | |
291 | struct hpet_dev *devp; | |
292 | ||
293 | devp = file->private_data; | |
294 | ||
295 | if (fasync_helper(fd, file, on, &devp->hd_async_queue) >= 0) | |
296 | return 0; | |
297 | else | |
298 | return -EIO; | |
299 | } | |
300 | ||
301 | static int hpet_release(struct inode *inode, struct file *file) | |
302 | { | |
303 | struct hpet_dev *devp; | |
304 | struct hpet_timer __iomem *timer; | |
305 | int irq = 0; | |
306 | ||
307 | devp = file->private_data; | |
308 | timer = devp->hd_timer; | |
309 | ||
310 | spin_lock_irq(&hpet_lock); | |
311 | ||
312 | writeq((readq(&timer->hpet_config) & ~Tn_INT_ENB_CNF_MASK), | |
313 | &timer->hpet_config); | |
314 | ||
315 | irq = devp->hd_irq; | |
316 | devp->hd_irq = 0; | |
317 | ||
318 | devp->hd_ireqfreq = 0; | |
319 | ||
320 | if (devp->hd_flags & HPET_PERIODIC | |
321 | && readq(&timer->hpet_config) & Tn_TYPE_CNF_MASK) { | |
322 | unsigned long v; | |
323 | ||
324 | v = readq(&timer->hpet_config); | |
325 | v ^= Tn_TYPE_CNF_MASK; | |
326 | writeq(v, &timer->hpet_config); | |
327 | } | |
328 | ||
329 | devp->hd_flags &= ~(HPET_OPEN | HPET_IE | HPET_PERIODIC); | |
330 | spin_unlock_irq(&hpet_lock); | |
331 | ||
332 | if (irq) | |
333 | free_irq(irq, devp); | |
334 | ||
335 | if (file->f_flags & FASYNC) | |
336 | hpet_fasync(-1, file, 0); | |
337 | ||
338 | file->private_data = NULL; | |
339 | return 0; | |
340 | } | |
341 | ||
342 | static int hpet_ioctl_common(struct hpet_dev *, int, unsigned long, int); | |
343 | ||
344 | static int | |
345 | hpet_ioctl(struct inode *inode, struct file *file, unsigned int cmd, | |
346 | unsigned long arg) | |
347 | { | |
348 | struct hpet_dev *devp; | |
349 | ||
350 | devp = file->private_data; | |
351 | return hpet_ioctl_common(devp, cmd, arg, 0); | |
352 | } | |
353 | ||
354 | static int hpet_ioctl_ieon(struct hpet_dev *devp) | |
355 | { | |
356 | struct hpet_timer __iomem *timer; | |
357 | struct hpet __iomem *hpet; | |
358 | struct hpets *hpetp; | |
359 | int irq; | |
360 | unsigned long g, v, t, m; | |
361 | unsigned long flags, isr; | |
362 | ||
363 | timer = devp->hd_timer; | |
364 | hpet = devp->hd_hpet; | |
365 | hpetp = devp->hd_hpets; | |
366 | ||
367 | v = readq(&timer->hpet_config); | |
368 | spin_lock_irq(&hpet_lock); | |
369 | ||
370 | if (devp->hd_flags & HPET_IE) { | |
371 | spin_unlock_irq(&hpet_lock); | |
372 | return -EBUSY; | |
373 | } | |
374 | ||
375 | devp->hd_flags |= HPET_IE; | |
376 | spin_unlock_irq(&hpet_lock); | |
377 | ||
378 | t = readq(&timer->hpet_config); | |
379 | irq = devp->hd_hdwirq; | |
380 | ||
381 | if (irq) { | |
382 | sprintf(devp->hd_name, "hpet%d", (int)(devp - hpetp->hp_dev)); | |
383 | ||
384 | if (request_irq | |
385 | (irq, hpet_interrupt, SA_INTERRUPT, devp->hd_name, (void *)devp)) { | |
386 | printk(KERN_ERR "hpet: IRQ %d is not free\n", irq); | |
387 | irq = 0; | |
388 | } | |
389 | } | |
390 | ||
391 | if (irq == 0) { | |
392 | spin_lock_irq(&hpet_lock); | |
393 | devp->hd_flags ^= HPET_IE; | |
394 | spin_unlock_irq(&hpet_lock); | |
395 | return -EIO; | |
396 | } | |
397 | ||
398 | devp->hd_irq = irq; | |
399 | t = devp->hd_ireqfreq; | |
400 | v = readq(&timer->hpet_config); | |
401 | g = v | Tn_INT_ENB_CNF_MASK; | |
402 | ||
403 | if (devp->hd_flags & HPET_PERIODIC) { | |
404 | write_counter(t, &timer->hpet_compare); | |
405 | g |= Tn_TYPE_CNF_MASK; | |
406 | v |= Tn_TYPE_CNF_MASK; | |
407 | writeq(v, &timer->hpet_config); | |
408 | v |= Tn_VAL_SET_CNF_MASK; | |
409 | writeq(v, &timer->hpet_config); | |
410 | local_irq_save(flags); | |
411 | m = read_counter(&hpet->hpet_mc); | |
412 | write_counter(t + m + hpetp->hp_delta, &timer->hpet_compare); | |
413 | } else { | |
414 | local_irq_save(flags); | |
415 | m = read_counter(&hpet->hpet_mc); | |
416 | write_counter(t + m + hpetp->hp_delta, &timer->hpet_compare); | |
417 | } | |
418 | ||
419 | isr = (1 << (devp - hpets->hp_dev)); | |
420 | writeq(isr, &hpet->hpet_isr); | |
421 | writeq(g, &timer->hpet_config); | |
422 | local_irq_restore(flags); | |
423 | ||
424 | return 0; | |
425 | } | |
426 | ||
427 | static inline unsigned long hpet_time_div(unsigned long dis) | |
428 | { | |
429 | unsigned long long m = 1000000000000000ULL; | |
430 | ||
431 | do_div(m, dis); | |
432 | ||
433 | return (unsigned long)m; | |
434 | } | |
435 | ||
436 | static int | |
437 | hpet_ioctl_common(struct hpet_dev *devp, int cmd, unsigned long arg, int kernel) | |
438 | { | |
439 | struct hpet_timer __iomem *timer; | |
440 | struct hpet __iomem *hpet; | |
441 | struct hpets *hpetp; | |
442 | int err; | |
443 | unsigned long v; | |
444 | ||
445 | switch (cmd) { | |
446 | case HPET_IE_OFF: | |
447 | case HPET_INFO: | |
448 | case HPET_EPI: | |
449 | case HPET_DPI: | |
450 | case HPET_IRQFREQ: | |
451 | timer = devp->hd_timer; | |
452 | hpet = devp->hd_hpet; | |
453 | hpetp = devp->hd_hpets; | |
454 | break; | |
455 | case HPET_IE_ON: | |
456 | return hpet_ioctl_ieon(devp); | |
457 | default: | |
458 | return -EINVAL; | |
459 | } | |
460 | ||
461 | err = 0; | |
462 | ||
463 | switch (cmd) { | |
464 | case HPET_IE_OFF: | |
465 | if ((devp->hd_flags & HPET_IE) == 0) | |
466 | break; | |
467 | v = readq(&timer->hpet_config); | |
468 | v &= ~Tn_INT_ENB_CNF_MASK; | |
469 | writeq(v, &timer->hpet_config); | |
470 | if (devp->hd_irq) { | |
471 | free_irq(devp->hd_irq, devp); | |
472 | devp->hd_irq = 0; | |
473 | } | |
474 | devp->hd_flags ^= HPET_IE; | |
475 | break; | |
476 | case HPET_INFO: | |
477 | { | |
478 | struct hpet_info info; | |
479 | ||
480 | info.hi_ireqfreq = hpet_time_div(hpetp->hp_period * | |
481 | devp->hd_ireqfreq); | |
482 | info.hi_flags = | |
483 | readq(&timer->hpet_config) & Tn_PER_INT_CAP_MASK; | |
484 | info.hi_hpet = devp->hd_hpets->hp_which; | |
485 | info.hi_timer = devp - devp->hd_hpets->hp_dev; | |
486 | if (copy_to_user((void __user *)arg, &info, sizeof(info))) | |
487 | err = -EFAULT; | |
488 | break; | |
489 | } | |
490 | case HPET_EPI: | |
491 | v = readq(&timer->hpet_config); | |
492 | if ((v & Tn_PER_INT_CAP_MASK) == 0) { | |
493 | err = -ENXIO; | |
494 | break; | |
495 | } | |
496 | devp->hd_flags |= HPET_PERIODIC; | |
497 | break; | |
498 | case HPET_DPI: | |
499 | v = readq(&timer->hpet_config); | |
500 | if ((v & Tn_PER_INT_CAP_MASK) == 0) { | |
501 | err = -ENXIO; | |
502 | break; | |
503 | } | |
504 | if (devp->hd_flags & HPET_PERIODIC && | |
505 | readq(&timer->hpet_config) & Tn_TYPE_CNF_MASK) { | |
506 | v = readq(&timer->hpet_config); | |
507 | v ^= Tn_TYPE_CNF_MASK; | |
508 | writeq(v, &timer->hpet_config); | |
509 | } | |
510 | devp->hd_flags &= ~HPET_PERIODIC; | |
511 | break; | |
512 | case HPET_IRQFREQ: | |
513 | if (!kernel && (arg > hpet_max_freq) && | |
514 | !capable(CAP_SYS_RESOURCE)) { | |
515 | err = -EACCES; | |
516 | break; | |
517 | } | |
518 | ||
519 | if (arg & (arg - 1)) { | |
520 | err = -EINVAL; | |
521 | break; | |
522 | } | |
523 | ||
524 | devp->hd_ireqfreq = hpet_time_div(hpetp->hp_period * arg); | |
525 | } | |
526 | ||
527 | return err; | |
528 | } | |
529 | ||
530 | static struct file_operations hpet_fops = { | |
531 | .owner = THIS_MODULE, | |
532 | .llseek = no_llseek, | |
533 | .read = hpet_read, | |
534 | .poll = hpet_poll, | |
535 | .ioctl = hpet_ioctl, | |
536 | .open = hpet_open, | |
537 | .release = hpet_release, | |
538 | .fasync = hpet_fasync, | |
539 | .mmap = hpet_mmap, | |
540 | }; | |
541 | ||
542 | EXPORT_SYMBOL(hpet_alloc); | |
543 | EXPORT_SYMBOL(hpet_register); | |
544 | EXPORT_SYMBOL(hpet_unregister); | |
545 | EXPORT_SYMBOL(hpet_control); | |
546 | ||
547 | int hpet_register(struct hpet_task *tp, int periodic) | |
548 | { | |
549 | unsigned int i; | |
550 | u64 mask; | |
551 | struct hpet_timer __iomem *timer; | |
552 | struct hpet_dev *devp; | |
553 | struct hpets *hpetp; | |
554 | ||
555 | switch (periodic) { | |
556 | case 1: | |
557 | mask = Tn_PER_INT_CAP_MASK; | |
558 | break; | |
559 | case 0: | |
560 | mask = 0; | |
561 | break; | |
562 | default: | |
563 | return -EINVAL; | |
564 | } | |
565 | ||
566 | spin_lock_irq(&hpet_task_lock); | |
567 | spin_lock(&hpet_lock); | |
568 | ||
569 | for (devp = NULL, hpetp = hpets; hpetp && !devp; hpetp = hpetp->hp_next) | |
570 | for (timer = hpetp->hp_hpet->hpet_timers, i = 0; | |
571 | i < hpetp->hp_ntimer; i++, timer++) { | |
572 | if ((readq(&timer->hpet_config) & Tn_PER_INT_CAP_MASK) | |
573 | != mask) | |
574 | continue; | |
575 | ||
576 | devp = &hpetp->hp_dev[i]; | |
577 | ||
578 | if (devp->hd_flags & HPET_OPEN || devp->hd_task) { | |
579 | devp = NULL; | |
580 | continue; | |
581 | } | |
582 | ||
583 | tp->ht_opaque = devp; | |
584 | devp->hd_task = tp; | |
585 | break; | |
586 | } | |
587 | ||
588 | spin_unlock(&hpet_lock); | |
589 | spin_unlock_irq(&hpet_task_lock); | |
590 | ||
591 | if (tp->ht_opaque) | |
592 | return 0; | |
593 | else | |
594 | return -EBUSY; | |
595 | } | |
596 | ||
597 | static inline int hpet_tpcheck(struct hpet_task *tp) | |
598 | { | |
599 | struct hpet_dev *devp; | |
600 | struct hpets *hpetp; | |
601 | ||
602 | devp = tp->ht_opaque; | |
603 | ||
604 | if (!devp) | |
605 | return -ENXIO; | |
606 | ||
607 | for (hpetp = hpets; hpetp; hpetp = hpetp->hp_next) | |
608 | if (devp >= hpetp->hp_dev | |
609 | && devp < (hpetp->hp_dev + hpetp->hp_ntimer) | |
610 | && devp->hd_hpet == hpetp->hp_hpet) | |
611 | return 0; | |
612 | ||
613 | return -ENXIO; | |
614 | } | |
615 | ||
616 | int hpet_unregister(struct hpet_task *tp) | |
617 | { | |
618 | struct hpet_dev *devp; | |
619 | struct hpet_timer __iomem *timer; | |
620 | int err; | |
621 | ||
622 | if ((err = hpet_tpcheck(tp))) | |
623 | return err; | |
624 | ||
625 | spin_lock_irq(&hpet_task_lock); | |
626 | spin_lock(&hpet_lock); | |
627 | ||
628 | devp = tp->ht_opaque; | |
629 | if (devp->hd_task != tp) { | |
630 | spin_unlock(&hpet_lock); | |
631 | spin_unlock_irq(&hpet_task_lock); | |
632 | return -ENXIO; | |
633 | } | |
634 | ||
635 | timer = devp->hd_timer; | |
636 | writeq((readq(&timer->hpet_config) & ~Tn_INT_ENB_CNF_MASK), | |
637 | &timer->hpet_config); | |
638 | devp->hd_flags &= ~(HPET_IE | HPET_PERIODIC); | |
639 | devp->hd_task = NULL; | |
640 | spin_unlock(&hpet_lock); | |
641 | spin_unlock_irq(&hpet_task_lock); | |
642 | ||
643 | return 0; | |
644 | } | |
645 | ||
646 | int hpet_control(struct hpet_task *tp, unsigned int cmd, unsigned long arg) | |
647 | { | |
648 | struct hpet_dev *devp; | |
649 | int err; | |
650 | ||
651 | if ((err = hpet_tpcheck(tp))) | |
652 | return err; | |
653 | ||
654 | spin_lock_irq(&hpet_lock); | |
655 | devp = tp->ht_opaque; | |
656 | if (devp->hd_task != tp) { | |
657 | spin_unlock_irq(&hpet_lock); | |
658 | return -ENXIO; | |
659 | } | |
660 | spin_unlock_irq(&hpet_lock); | |
661 | return hpet_ioctl_common(devp, cmd, arg, 1); | |
662 | } | |
663 | ||
664 | static ctl_table hpet_table[] = { | |
665 | { | |
666 | .ctl_name = 1, | |
667 | .procname = "max-user-freq", | |
668 | .data = &hpet_max_freq, | |
669 | .maxlen = sizeof(int), | |
670 | .mode = 0644, | |
671 | .proc_handler = &proc_dointvec, | |
672 | }, | |
673 | {.ctl_name = 0} | |
674 | }; | |
675 | ||
676 | static ctl_table hpet_root[] = { | |
677 | { | |
678 | .ctl_name = 1, | |
679 | .procname = "hpet", | |
680 | .maxlen = 0, | |
681 | .mode = 0555, | |
682 | .child = hpet_table, | |
683 | }, | |
684 | {.ctl_name = 0} | |
685 | }; | |
686 | ||
687 | static ctl_table dev_root[] = { | |
688 | { | |
689 | .ctl_name = CTL_DEV, | |
690 | .procname = "dev", | |
691 | .maxlen = 0, | |
692 | .mode = 0555, | |
693 | .child = hpet_root, | |
694 | }, | |
695 | {.ctl_name = 0} | |
696 | }; | |
697 | ||
698 | static struct ctl_table_header *sysctl_header; | |
699 | ||
700 | static void hpet_register_interpolator(struct hpets *hpetp) | |
701 | { | |
702 | #ifdef CONFIG_TIME_INTERPOLATION | |
703 | struct time_interpolator *ti; | |
704 | ||
705 | ti = kmalloc(sizeof(*ti), GFP_KERNEL); | |
706 | if (!ti) | |
707 | return; | |
708 | ||
709 | memset(ti, 0, sizeof(*ti)); | |
710 | ti->source = TIME_SOURCE_MMIO64; | |
711 | ti->shift = 10; | |
712 | ti->addr = &hpetp->hp_hpet->hpet_mc; | |
713 | ti->frequency = hpet_time_div(hpets->hp_period); | |
96803820 | 714 | ti->drift = HPET_DRIFT; |
1da177e4 LT |
715 | ti->mask = -1; |
716 | ||
717 | hpetp->hp_interpolator = ti; | |
718 | register_time_interpolator(ti); | |
719 | #endif | |
720 | } | |
721 | ||
722 | /* | |
723 | * Adjustment for when arming the timer with | |
724 | * initial conditions. That is, main counter | |
725 | * ticks expired before interrupts are enabled. | |
726 | */ | |
727 | #define TICK_CALIBRATE (1000UL) | |
728 | ||
729 | static unsigned long hpet_calibrate(struct hpets *hpetp) | |
730 | { | |
731 | struct hpet_timer __iomem *timer = NULL; | |
732 | unsigned long t, m, count, i, flags, start; | |
733 | struct hpet_dev *devp; | |
734 | int j; | |
735 | struct hpet __iomem *hpet; | |
736 | ||
737 | for (j = 0, devp = hpetp->hp_dev; j < hpetp->hp_ntimer; j++, devp++) | |
738 | if ((devp->hd_flags & HPET_OPEN) == 0) { | |
739 | timer = devp->hd_timer; | |
740 | break; | |
741 | } | |
742 | ||
743 | if (!timer) | |
744 | return 0; | |
745 | ||
746 | hpet = hpets->hp_hpet; | |
747 | t = read_counter(&timer->hpet_compare); | |
748 | ||
749 | i = 0; | |
750 | count = hpet_time_div(hpetp->hp_period * TICK_CALIBRATE); | |
751 | ||
752 | local_irq_save(flags); | |
753 | ||
754 | start = read_counter(&hpet->hpet_mc); | |
755 | ||
756 | do { | |
757 | m = read_counter(&hpet->hpet_mc); | |
758 | write_counter(t + m + hpetp->hp_delta, &timer->hpet_compare); | |
759 | } while (i++, (m - start) < count); | |
760 | ||
761 | local_irq_restore(flags); | |
762 | ||
763 | return (m - start) / i; | |
764 | } | |
765 | ||
766 | int hpet_alloc(struct hpet_data *hdp) | |
767 | { | |
768 | u64 cap, mcfg; | |
769 | struct hpet_dev *devp; | |
770 | u32 i, ntimer; | |
771 | struct hpets *hpetp; | |
772 | size_t siz; | |
773 | struct hpet __iomem *hpet; | |
774 | static struct hpets *last = (struct hpets *)0; | |
775 | unsigned long ns; | |
776 | ||
777 | /* | |
778 | * hpet_alloc can be called by platform dependent code. | |
779 | * if platform dependent code has allocated the hpet | |
780 | * ACPI also reports hpet, then we catch it here. | |
781 | */ | |
782 | for (hpetp = hpets; hpetp; hpetp = hpetp->hp_next) | |
783 | if (hpetp->hp_hpet == hdp->hd_address) | |
784 | return 0; | |
785 | ||
786 | siz = sizeof(struct hpets) + ((hdp->hd_nirqs - 1) * | |
787 | sizeof(struct hpet_dev)); | |
788 | ||
789 | hpetp = kmalloc(siz, GFP_KERNEL); | |
790 | ||
791 | if (!hpetp) | |
792 | return -ENOMEM; | |
793 | ||
794 | memset(hpetp, 0, siz); | |
795 | ||
796 | hpetp->hp_which = hpet_nhpet++; | |
797 | hpetp->hp_hpet = hdp->hd_address; | |
798 | hpetp->hp_hpet_phys = hdp->hd_phys_address; | |
799 | ||
800 | hpetp->hp_ntimer = hdp->hd_nirqs; | |
801 | ||
802 | for (i = 0; i < hdp->hd_nirqs; i++) | |
803 | hpetp->hp_dev[i].hd_hdwirq = hdp->hd_irq[i]; | |
804 | ||
805 | hpet = hpetp->hp_hpet; | |
806 | ||
807 | cap = readq(&hpet->hpet_cap); | |
808 | ||
809 | ntimer = ((cap & HPET_NUM_TIM_CAP_MASK) >> HPET_NUM_TIM_CAP_SHIFT) + 1; | |
810 | ||
811 | if (hpetp->hp_ntimer != ntimer) { | |
812 | printk(KERN_WARNING "hpet: number irqs doesn't agree" | |
813 | " with number of timers\n"); | |
814 | kfree(hpetp); | |
815 | return -ENODEV; | |
816 | } | |
817 | ||
818 | if (last) | |
819 | last->hp_next = hpetp; | |
820 | else | |
821 | hpets = hpetp; | |
822 | ||
823 | last = hpetp; | |
824 | ||
825 | hpetp->hp_period = (cap & HPET_COUNTER_CLK_PERIOD_MASK) >> | |
826 | HPET_COUNTER_CLK_PERIOD_SHIFT; | |
827 | ||
828 | printk(KERN_INFO "hpet%d: at MMIO 0x%lx, IRQ%s", | |
829 | hpetp->hp_which, hdp->hd_phys_address, | |
830 | hpetp->hp_ntimer > 1 ? "s" : ""); | |
831 | for (i = 0; i < hpetp->hp_ntimer; i++) | |
832 | printk("%s %d", i > 0 ? "," : "", hdp->hd_irq[i]); | |
833 | printk("\n"); | |
834 | ||
835 | ns = hpetp->hp_period; /* femptoseconds, 10^-15 */ | |
44f410a7 | 836 | ns /= 1000000; /* convert to nanoseconds, 10^-9 */ |
1da177e4 LT |
837 | printk(KERN_INFO "hpet%d: %ldns tick, %d %d-bit timers\n", |
838 | hpetp->hp_which, ns, hpetp->hp_ntimer, | |
839 | cap & HPET_COUNTER_SIZE_MASK ? 64 : 32); | |
840 | ||
841 | mcfg = readq(&hpet->hpet_config); | |
842 | if ((mcfg & HPET_ENABLE_CNF_MASK) == 0) { | |
843 | write_counter(0L, &hpet->hpet_mc); | |
844 | mcfg |= HPET_ENABLE_CNF_MASK; | |
845 | writeq(mcfg, &hpet->hpet_config); | |
846 | } | |
847 | ||
848 | for (i = 0, devp = hpetp->hp_dev; i < hpetp->hp_ntimer; | |
849 | i++, hpet_ntimer++, devp++) { | |
850 | unsigned long v; | |
851 | struct hpet_timer __iomem *timer; | |
852 | ||
853 | timer = &hpet->hpet_timers[devp - hpetp->hp_dev]; | |
854 | v = readq(&timer->hpet_config); | |
855 | ||
856 | devp->hd_hpets = hpetp; | |
857 | devp->hd_hpet = hpet; | |
858 | devp->hd_timer = timer; | |
859 | ||
860 | /* | |
861 | * If the timer was reserved by platform code, | |
862 | * then make timer unavailable for opens. | |
863 | */ | |
864 | if (hdp->hd_state & (1 << i)) { | |
865 | devp->hd_flags = HPET_OPEN; | |
866 | continue; | |
867 | } | |
868 | ||
869 | init_waitqueue_head(&devp->hd_waitqueue); | |
870 | } | |
871 | ||
872 | hpetp->hp_delta = hpet_calibrate(hpetp); | |
873 | hpet_register_interpolator(hpetp); | |
874 | ||
875 | return 0; | |
876 | } | |
877 | ||
878 | static acpi_status hpet_resources(struct acpi_resource *res, void *data) | |
879 | { | |
880 | struct hpet_data *hdp; | |
881 | acpi_status status; | |
882 | struct acpi_resource_address64 addr; | |
883 | struct hpets *hpetp; | |
884 | ||
885 | hdp = data; | |
886 | ||
887 | status = acpi_resource_to_address64(res, &addr); | |
888 | ||
889 | if (ACPI_SUCCESS(status)) { | |
890 | unsigned long size; | |
891 | ||
892 | size = addr.max_address_range - addr.min_address_range + 1; | |
893 | hdp->hd_phys_address = addr.min_address_range; | |
894 | hdp->hd_address = ioremap(addr.min_address_range, size); | |
895 | ||
896 | for (hpetp = hpets; hpetp; hpetp = hpetp->hp_next) | |
897 | if (hpetp->hp_hpet == hdp->hd_address) | |
898 | return -EBUSY; | |
899 | } else if (res->id == ACPI_RSTYPE_EXT_IRQ) { | |
900 | struct acpi_resource_ext_irq *irqp; | |
901 | int i; | |
902 | ||
903 | irqp = &res->data.extended_irq; | |
904 | ||
905 | if (irqp->number_of_interrupts > 0) { | |
906 | hdp->hd_nirqs = irqp->number_of_interrupts; | |
907 | ||
a9bd53bc KK |
908 | for (i = 0; i < hdp->hd_nirqs; i++) { |
909 | int rc = | |
1da177e4 LT |
910 | acpi_register_gsi(irqp->interrupts[i], |
911 | irqp->edge_level, | |
912 | irqp->active_high_low); | |
a9bd53bc KK |
913 | if (rc < 0) |
914 | return AE_ERROR; | |
915 | hdp->hd_irq[i] = rc; | |
916 | } | |
1da177e4 LT |
917 | } |
918 | } | |
919 | ||
920 | return AE_OK; | |
921 | } | |
922 | ||
923 | static int hpet_acpi_add(struct acpi_device *device) | |
924 | { | |
925 | acpi_status result; | |
926 | struct hpet_data data; | |
927 | ||
928 | memset(&data, 0, sizeof(data)); | |
929 | ||
930 | result = | |
931 | acpi_walk_resources(device->handle, METHOD_NAME__CRS, | |
932 | hpet_resources, &data); | |
933 | ||
934 | if (ACPI_FAILURE(result)) | |
935 | return -ENODEV; | |
936 | ||
937 | if (!data.hd_address || !data.hd_nirqs) { | |
938 | printk("%s: no address or irqs in _CRS\n", __FUNCTION__); | |
939 | return -ENODEV; | |
940 | } | |
941 | ||
942 | return hpet_alloc(&data); | |
943 | } | |
944 | ||
945 | static int hpet_acpi_remove(struct acpi_device *device, int type) | |
946 | { | |
947 | /* XXX need to unregister interpolator, dealloc mem, etc */ | |
948 | return -EINVAL; | |
949 | } | |
950 | ||
951 | static struct acpi_driver hpet_acpi_driver = { | |
952 | .name = "hpet", | |
953 | .ids = "PNP0103", | |
954 | .ops = { | |
955 | .add = hpet_acpi_add, | |
956 | .remove = hpet_acpi_remove, | |
957 | }, | |
958 | }; | |
959 | ||
960 | static struct miscdevice hpet_misc = { HPET_MINOR, "hpet", &hpet_fops }; | |
961 | ||
962 | static int __init hpet_init(void) | |
963 | { | |
964 | int result; | |
965 | ||
966 | result = misc_register(&hpet_misc); | |
967 | if (result < 0) | |
968 | return -ENODEV; | |
969 | ||
970 | sysctl_header = register_sysctl_table(dev_root, 0); | |
971 | ||
972 | result = acpi_bus_register_driver(&hpet_acpi_driver); | |
973 | if (result < 0) { | |
974 | if (sysctl_header) | |
975 | unregister_sysctl_table(sysctl_header); | |
976 | misc_deregister(&hpet_misc); | |
977 | return result; | |
978 | } | |
979 | ||
980 | return 0; | |
981 | } | |
982 | ||
983 | static void __exit hpet_exit(void) | |
984 | { | |
985 | acpi_bus_unregister_driver(&hpet_acpi_driver); | |
986 | ||
987 | if (sysctl_header) | |
988 | unregister_sysctl_table(sysctl_header); | |
989 | misc_deregister(&hpet_misc); | |
990 | ||
991 | return; | |
992 | } | |
993 | ||
994 | module_init(hpet_init); | |
995 | module_exit(hpet_exit); | |
996 | MODULE_AUTHOR("Bob Picco <Robert.Picco@hp.com>"); | |
997 | MODULE_LICENSE("GPL"); |