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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 | |
103 | static unsigned long long __inline readq(void __iomem *addr) | |
104 | { | |
105 | return readl(addr) | (((unsigned long long)readl(addr + 4)) << 32LL); | |
106 | } | |
107 | #endif | |
108 | ||
109 | #ifndef writeq | |
110 | static void __inline writeq(unsigned long long v, void __iomem *addr) | |
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); | |
276 | addr = __pa(addr); | |
277 | ||
278 | if (io_remap_pfn_range(vma, vma->vm_start, addr >> PAGE_SHIFT, | |
279 | PAGE_SIZE, vma->vm_page_prot)) { | |
280 | printk(KERN_ERR "remap_pfn_range failed in hpet.c\n"); | |
281 | return -EAGAIN; | |
282 | } | |
283 | ||
284 | return 0; | |
285 | #else | |
286 | return -ENOSYS; | |
287 | #endif | |
288 | } | |
289 | ||
290 | static int hpet_fasync(int fd, struct file *file, int on) | |
291 | { | |
292 | struct hpet_dev *devp; | |
293 | ||
294 | devp = file->private_data; | |
295 | ||
296 | if (fasync_helper(fd, file, on, &devp->hd_async_queue) >= 0) | |
297 | return 0; | |
298 | else | |
299 | return -EIO; | |
300 | } | |
301 | ||
302 | static int hpet_release(struct inode *inode, struct file *file) | |
303 | { | |
304 | struct hpet_dev *devp; | |
305 | struct hpet_timer __iomem *timer; | |
306 | int irq = 0; | |
307 | ||
308 | devp = file->private_data; | |
309 | timer = devp->hd_timer; | |
310 | ||
311 | spin_lock_irq(&hpet_lock); | |
312 | ||
313 | writeq((readq(&timer->hpet_config) & ~Tn_INT_ENB_CNF_MASK), | |
314 | &timer->hpet_config); | |
315 | ||
316 | irq = devp->hd_irq; | |
317 | devp->hd_irq = 0; | |
318 | ||
319 | devp->hd_ireqfreq = 0; | |
320 | ||
321 | if (devp->hd_flags & HPET_PERIODIC | |
322 | && readq(&timer->hpet_config) & Tn_TYPE_CNF_MASK) { | |
323 | unsigned long v; | |
324 | ||
325 | v = readq(&timer->hpet_config); | |
326 | v ^= Tn_TYPE_CNF_MASK; | |
327 | writeq(v, &timer->hpet_config); | |
328 | } | |
329 | ||
330 | devp->hd_flags &= ~(HPET_OPEN | HPET_IE | HPET_PERIODIC); | |
331 | spin_unlock_irq(&hpet_lock); | |
332 | ||
333 | if (irq) | |
334 | free_irq(irq, devp); | |
335 | ||
336 | if (file->f_flags & FASYNC) | |
337 | hpet_fasync(-1, file, 0); | |
338 | ||
339 | file->private_data = NULL; | |
340 | return 0; | |
341 | } | |
342 | ||
343 | static int hpet_ioctl_common(struct hpet_dev *, int, unsigned long, int); | |
344 | ||
345 | static int | |
346 | hpet_ioctl(struct inode *inode, struct file *file, unsigned int cmd, | |
347 | unsigned long arg) | |
348 | { | |
349 | struct hpet_dev *devp; | |
350 | ||
351 | devp = file->private_data; | |
352 | return hpet_ioctl_common(devp, cmd, arg, 0); | |
353 | } | |
354 | ||
355 | static int hpet_ioctl_ieon(struct hpet_dev *devp) | |
356 | { | |
357 | struct hpet_timer __iomem *timer; | |
358 | struct hpet __iomem *hpet; | |
359 | struct hpets *hpetp; | |
360 | int irq; | |
361 | unsigned long g, v, t, m; | |
362 | unsigned long flags, isr; | |
363 | ||
364 | timer = devp->hd_timer; | |
365 | hpet = devp->hd_hpet; | |
366 | hpetp = devp->hd_hpets; | |
367 | ||
368 | v = readq(&timer->hpet_config); | |
369 | spin_lock_irq(&hpet_lock); | |
370 | ||
371 | if (devp->hd_flags & HPET_IE) { | |
372 | spin_unlock_irq(&hpet_lock); | |
373 | return -EBUSY; | |
374 | } | |
375 | ||
376 | devp->hd_flags |= HPET_IE; | |
377 | spin_unlock_irq(&hpet_lock); | |
378 | ||
379 | t = readq(&timer->hpet_config); | |
380 | irq = devp->hd_hdwirq; | |
381 | ||
382 | if (irq) { | |
383 | sprintf(devp->hd_name, "hpet%d", (int)(devp - hpetp->hp_dev)); | |
384 | ||
385 | if (request_irq | |
386 | (irq, hpet_interrupt, SA_INTERRUPT, devp->hd_name, (void *)devp)) { | |
387 | printk(KERN_ERR "hpet: IRQ %d is not free\n", irq); | |
388 | irq = 0; | |
389 | } | |
390 | } | |
391 | ||
392 | if (irq == 0) { | |
393 | spin_lock_irq(&hpet_lock); | |
394 | devp->hd_flags ^= HPET_IE; | |
395 | spin_unlock_irq(&hpet_lock); | |
396 | return -EIO; | |
397 | } | |
398 | ||
399 | devp->hd_irq = irq; | |
400 | t = devp->hd_ireqfreq; | |
401 | v = readq(&timer->hpet_config); | |
402 | g = v | Tn_INT_ENB_CNF_MASK; | |
403 | ||
404 | if (devp->hd_flags & HPET_PERIODIC) { | |
405 | write_counter(t, &timer->hpet_compare); | |
406 | g |= Tn_TYPE_CNF_MASK; | |
407 | v |= Tn_TYPE_CNF_MASK; | |
408 | writeq(v, &timer->hpet_config); | |
409 | v |= Tn_VAL_SET_CNF_MASK; | |
410 | writeq(v, &timer->hpet_config); | |
411 | local_irq_save(flags); | |
412 | m = read_counter(&hpet->hpet_mc); | |
413 | write_counter(t + m + hpetp->hp_delta, &timer->hpet_compare); | |
414 | } else { | |
415 | local_irq_save(flags); | |
416 | m = read_counter(&hpet->hpet_mc); | |
417 | write_counter(t + m + hpetp->hp_delta, &timer->hpet_compare); | |
418 | } | |
419 | ||
420 | isr = (1 << (devp - hpets->hp_dev)); | |
421 | writeq(isr, &hpet->hpet_isr); | |
422 | writeq(g, &timer->hpet_config); | |
423 | local_irq_restore(flags); | |
424 | ||
425 | return 0; | |
426 | } | |
427 | ||
428 | static inline unsigned long hpet_time_div(unsigned long dis) | |
429 | { | |
430 | unsigned long long m = 1000000000000000ULL; | |
431 | ||
432 | do_div(m, dis); | |
433 | ||
434 | return (unsigned long)m; | |
435 | } | |
436 | ||
437 | static int | |
438 | hpet_ioctl_common(struct hpet_dev *devp, int cmd, unsigned long arg, int kernel) | |
439 | { | |
440 | struct hpet_timer __iomem *timer; | |
441 | struct hpet __iomem *hpet; | |
442 | struct hpets *hpetp; | |
443 | int err; | |
444 | unsigned long v; | |
445 | ||
446 | switch (cmd) { | |
447 | case HPET_IE_OFF: | |
448 | case HPET_INFO: | |
449 | case HPET_EPI: | |
450 | case HPET_DPI: | |
451 | case HPET_IRQFREQ: | |
452 | timer = devp->hd_timer; | |
453 | hpet = devp->hd_hpet; | |
454 | hpetp = devp->hd_hpets; | |
455 | break; | |
456 | case HPET_IE_ON: | |
457 | return hpet_ioctl_ieon(devp); | |
458 | default: | |
459 | return -EINVAL; | |
460 | } | |
461 | ||
462 | err = 0; | |
463 | ||
464 | switch (cmd) { | |
465 | case HPET_IE_OFF: | |
466 | if ((devp->hd_flags & HPET_IE) == 0) | |
467 | break; | |
468 | v = readq(&timer->hpet_config); | |
469 | v &= ~Tn_INT_ENB_CNF_MASK; | |
470 | writeq(v, &timer->hpet_config); | |
471 | if (devp->hd_irq) { | |
472 | free_irq(devp->hd_irq, devp); | |
473 | devp->hd_irq = 0; | |
474 | } | |
475 | devp->hd_flags ^= HPET_IE; | |
476 | break; | |
477 | case HPET_INFO: | |
478 | { | |
479 | struct hpet_info info; | |
480 | ||
481 | info.hi_ireqfreq = hpet_time_div(hpetp->hp_period * | |
482 | devp->hd_ireqfreq); | |
483 | info.hi_flags = | |
484 | readq(&timer->hpet_config) & Tn_PER_INT_CAP_MASK; | |
485 | info.hi_hpet = devp->hd_hpets->hp_which; | |
486 | info.hi_timer = devp - devp->hd_hpets->hp_dev; | |
487 | if (copy_to_user((void __user *)arg, &info, sizeof(info))) | |
488 | err = -EFAULT; | |
489 | break; | |
490 | } | |
491 | case HPET_EPI: | |
492 | v = readq(&timer->hpet_config); | |
493 | if ((v & Tn_PER_INT_CAP_MASK) == 0) { | |
494 | err = -ENXIO; | |
495 | break; | |
496 | } | |
497 | devp->hd_flags |= HPET_PERIODIC; | |
498 | break; | |
499 | case HPET_DPI: | |
500 | v = readq(&timer->hpet_config); | |
501 | if ((v & Tn_PER_INT_CAP_MASK) == 0) { | |
502 | err = -ENXIO; | |
503 | break; | |
504 | } | |
505 | if (devp->hd_flags & HPET_PERIODIC && | |
506 | readq(&timer->hpet_config) & Tn_TYPE_CNF_MASK) { | |
507 | v = readq(&timer->hpet_config); | |
508 | v ^= Tn_TYPE_CNF_MASK; | |
509 | writeq(v, &timer->hpet_config); | |
510 | } | |
511 | devp->hd_flags &= ~HPET_PERIODIC; | |
512 | break; | |
513 | case HPET_IRQFREQ: | |
514 | if (!kernel && (arg > hpet_max_freq) && | |
515 | !capable(CAP_SYS_RESOURCE)) { | |
516 | err = -EACCES; | |
517 | break; | |
518 | } | |
519 | ||
520 | if (arg & (arg - 1)) { | |
521 | err = -EINVAL; | |
522 | break; | |
523 | } | |
524 | ||
525 | devp->hd_ireqfreq = hpet_time_div(hpetp->hp_period * arg); | |
526 | } | |
527 | ||
528 | return err; | |
529 | } | |
530 | ||
531 | static struct file_operations hpet_fops = { | |
532 | .owner = THIS_MODULE, | |
533 | .llseek = no_llseek, | |
534 | .read = hpet_read, | |
535 | .poll = hpet_poll, | |
536 | .ioctl = hpet_ioctl, | |
537 | .open = hpet_open, | |
538 | .release = hpet_release, | |
539 | .fasync = hpet_fasync, | |
540 | .mmap = hpet_mmap, | |
541 | }; | |
542 | ||
543 | EXPORT_SYMBOL(hpet_alloc); | |
544 | EXPORT_SYMBOL(hpet_register); | |
545 | EXPORT_SYMBOL(hpet_unregister); | |
546 | EXPORT_SYMBOL(hpet_control); | |
547 | ||
548 | int hpet_register(struct hpet_task *tp, int periodic) | |
549 | { | |
550 | unsigned int i; | |
551 | u64 mask; | |
552 | struct hpet_timer __iomem *timer; | |
553 | struct hpet_dev *devp; | |
554 | struct hpets *hpetp; | |
555 | ||
556 | switch (periodic) { | |
557 | case 1: | |
558 | mask = Tn_PER_INT_CAP_MASK; | |
559 | break; | |
560 | case 0: | |
561 | mask = 0; | |
562 | break; | |
563 | default: | |
564 | return -EINVAL; | |
565 | } | |
566 | ||
567 | spin_lock_irq(&hpet_task_lock); | |
568 | spin_lock(&hpet_lock); | |
569 | ||
570 | for (devp = NULL, hpetp = hpets; hpetp && !devp; hpetp = hpetp->hp_next) | |
571 | for (timer = hpetp->hp_hpet->hpet_timers, i = 0; | |
572 | i < hpetp->hp_ntimer; i++, timer++) { | |
573 | if ((readq(&timer->hpet_config) & Tn_PER_INT_CAP_MASK) | |
574 | != mask) | |
575 | continue; | |
576 | ||
577 | devp = &hpetp->hp_dev[i]; | |
578 | ||
579 | if (devp->hd_flags & HPET_OPEN || devp->hd_task) { | |
580 | devp = NULL; | |
581 | continue; | |
582 | } | |
583 | ||
584 | tp->ht_opaque = devp; | |
585 | devp->hd_task = tp; | |
586 | break; | |
587 | } | |
588 | ||
589 | spin_unlock(&hpet_lock); | |
590 | spin_unlock_irq(&hpet_task_lock); | |
591 | ||
592 | if (tp->ht_opaque) | |
593 | return 0; | |
594 | else | |
595 | return -EBUSY; | |
596 | } | |
597 | ||
598 | static inline int hpet_tpcheck(struct hpet_task *tp) | |
599 | { | |
600 | struct hpet_dev *devp; | |
601 | struct hpets *hpetp; | |
602 | ||
603 | devp = tp->ht_opaque; | |
604 | ||
605 | if (!devp) | |
606 | return -ENXIO; | |
607 | ||
608 | for (hpetp = hpets; hpetp; hpetp = hpetp->hp_next) | |
609 | if (devp >= hpetp->hp_dev | |
610 | && devp < (hpetp->hp_dev + hpetp->hp_ntimer) | |
611 | && devp->hd_hpet == hpetp->hp_hpet) | |
612 | return 0; | |
613 | ||
614 | return -ENXIO; | |
615 | } | |
616 | ||
617 | int hpet_unregister(struct hpet_task *tp) | |
618 | { | |
619 | struct hpet_dev *devp; | |
620 | struct hpet_timer __iomem *timer; | |
621 | int err; | |
622 | ||
623 | if ((err = hpet_tpcheck(tp))) | |
624 | return err; | |
625 | ||
626 | spin_lock_irq(&hpet_task_lock); | |
627 | spin_lock(&hpet_lock); | |
628 | ||
629 | devp = tp->ht_opaque; | |
630 | if (devp->hd_task != tp) { | |
631 | spin_unlock(&hpet_lock); | |
632 | spin_unlock_irq(&hpet_task_lock); | |
633 | return -ENXIO; | |
634 | } | |
635 | ||
636 | timer = devp->hd_timer; | |
637 | writeq((readq(&timer->hpet_config) & ~Tn_INT_ENB_CNF_MASK), | |
638 | &timer->hpet_config); | |
639 | devp->hd_flags &= ~(HPET_IE | HPET_PERIODIC); | |
640 | devp->hd_task = NULL; | |
641 | spin_unlock(&hpet_lock); | |
642 | spin_unlock_irq(&hpet_task_lock); | |
643 | ||
644 | return 0; | |
645 | } | |
646 | ||
647 | int hpet_control(struct hpet_task *tp, unsigned int cmd, unsigned long arg) | |
648 | { | |
649 | struct hpet_dev *devp; | |
650 | int err; | |
651 | ||
652 | if ((err = hpet_tpcheck(tp))) | |
653 | return err; | |
654 | ||
655 | spin_lock_irq(&hpet_lock); | |
656 | devp = tp->ht_opaque; | |
657 | if (devp->hd_task != tp) { | |
658 | spin_unlock_irq(&hpet_lock); | |
659 | return -ENXIO; | |
660 | } | |
661 | spin_unlock_irq(&hpet_lock); | |
662 | return hpet_ioctl_common(devp, cmd, arg, 1); | |
663 | } | |
664 | ||
665 | static ctl_table hpet_table[] = { | |
666 | { | |
667 | .ctl_name = 1, | |
668 | .procname = "max-user-freq", | |
669 | .data = &hpet_max_freq, | |
670 | .maxlen = sizeof(int), | |
671 | .mode = 0644, | |
672 | .proc_handler = &proc_dointvec, | |
673 | }, | |
674 | {.ctl_name = 0} | |
675 | }; | |
676 | ||
677 | static ctl_table hpet_root[] = { | |
678 | { | |
679 | .ctl_name = 1, | |
680 | .procname = "hpet", | |
681 | .maxlen = 0, | |
682 | .mode = 0555, | |
683 | .child = hpet_table, | |
684 | }, | |
685 | {.ctl_name = 0} | |
686 | }; | |
687 | ||
688 | static ctl_table dev_root[] = { | |
689 | { | |
690 | .ctl_name = CTL_DEV, | |
691 | .procname = "dev", | |
692 | .maxlen = 0, | |
693 | .mode = 0555, | |
694 | .child = hpet_root, | |
695 | }, | |
696 | {.ctl_name = 0} | |
697 | }; | |
698 | ||
699 | static struct ctl_table_header *sysctl_header; | |
700 | ||
701 | static void hpet_register_interpolator(struct hpets *hpetp) | |
702 | { | |
703 | #ifdef CONFIG_TIME_INTERPOLATION | |
704 | struct time_interpolator *ti; | |
705 | ||
706 | ti = kmalloc(sizeof(*ti), GFP_KERNEL); | |
707 | if (!ti) | |
708 | return; | |
709 | ||
710 | memset(ti, 0, sizeof(*ti)); | |
711 | ti->source = TIME_SOURCE_MMIO64; | |
712 | ti->shift = 10; | |
713 | ti->addr = &hpetp->hp_hpet->hpet_mc; | |
714 | ti->frequency = hpet_time_div(hpets->hp_period); | |
96803820 | 715 | ti->drift = HPET_DRIFT; |
1da177e4 LT |
716 | ti->mask = -1; |
717 | ||
718 | hpetp->hp_interpolator = ti; | |
719 | register_time_interpolator(ti); | |
720 | #endif | |
721 | } | |
722 | ||
723 | /* | |
724 | * Adjustment for when arming the timer with | |
725 | * initial conditions. That is, main counter | |
726 | * ticks expired before interrupts are enabled. | |
727 | */ | |
728 | #define TICK_CALIBRATE (1000UL) | |
729 | ||
730 | static unsigned long hpet_calibrate(struct hpets *hpetp) | |
731 | { | |
732 | struct hpet_timer __iomem *timer = NULL; | |
733 | unsigned long t, m, count, i, flags, start; | |
734 | struct hpet_dev *devp; | |
735 | int j; | |
736 | struct hpet __iomem *hpet; | |
737 | ||
738 | for (j = 0, devp = hpetp->hp_dev; j < hpetp->hp_ntimer; j++, devp++) | |
739 | if ((devp->hd_flags & HPET_OPEN) == 0) { | |
740 | timer = devp->hd_timer; | |
741 | break; | |
742 | } | |
743 | ||
744 | if (!timer) | |
745 | return 0; | |
746 | ||
747 | hpet = hpets->hp_hpet; | |
748 | t = read_counter(&timer->hpet_compare); | |
749 | ||
750 | i = 0; | |
751 | count = hpet_time_div(hpetp->hp_period * TICK_CALIBRATE); | |
752 | ||
753 | local_irq_save(flags); | |
754 | ||
755 | start = read_counter(&hpet->hpet_mc); | |
756 | ||
757 | do { | |
758 | m = read_counter(&hpet->hpet_mc); | |
759 | write_counter(t + m + hpetp->hp_delta, &timer->hpet_compare); | |
760 | } while (i++, (m - start) < count); | |
761 | ||
762 | local_irq_restore(flags); | |
763 | ||
764 | return (m - start) / i; | |
765 | } | |
766 | ||
767 | int hpet_alloc(struct hpet_data *hdp) | |
768 | { | |
769 | u64 cap, mcfg; | |
770 | struct hpet_dev *devp; | |
771 | u32 i, ntimer; | |
772 | struct hpets *hpetp; | |
773 | size_t siz; | |
774 | struct hpet __iomem *hpet; | |
775 | static struct hpets *last = (struct hpets *)0; | |
776 | unsigned long ns; | |
777 | ||
778 | /* | |
779 | * hpet_alloc can be called by platform dependent code. | |
780 | * if platform dependent code has allocated the hpet | |
781 | * ACPI also reports hpet, then we catch it here. | |
782 | */ | |
783 | for (hpetp = hpets; hpetp; hpetp = hpetp->hp_next) | |
784 | if (hpetp->hp_hpet == hdp->hd_address) | |
785 | return 0; | |
786 | ||
787 | siz = sizeof(struct hpets) + ((hdp->hd_nirqs - 1) * | |
788 | sizeof(struct hpet_dev)); | |
789 | ||
790 | hpetp = kmalloc(siz, GFP_KERNEL); | |
791 | ||
792 | if (!hpetp) | |
793 | return -ENOMEM; | |
794 | ||
795 | memset(hpetp, 0, siz); | |
796 | ||
797 | hpetp->hp_which = hpet_nhpet++; | |
798 | hpetp->hp_hpet = hdp->hd_address; | |
799 | hpetp->hp_hpet_phys = hdp->hd_phys_address; | |
800 | ||
801 | hpetp->hp_ntimer = hdp->hd_nirqs; | |
802 | ||
803 | for (i = 0; i < hdp->hd_nirqs; i++) | |
804 | hpetp->hp_dev[i].hd_hdwirq = hdp->hd_irq[i]; | |
805 | ||
806 | hpet = hpetp->hp_hpet; | |
807 | ||
808 | cap = readq(&hpet->hpet_cap); | |
809 | ||
810 | ntimer = ((cap & HPET_NUM_TIM_CAP_MASK) >> HPET_NUM_TIM_CAP_SHIFT) + 1; | |
811 | ||
812 | if (hpetp->hp_ntimer != ntimer) { | |
813 | printk(KERN_WARNING "hpet: number irqs doesn't agree" | |
814 | " with number of timers\n"); | |
815 | kfree(hpetp); | |
816 | return -ENODEV; | |
817 | } | |
818 | ||
819 | if (last) | |
820 | last->hp_next = hpetp; | |
821 | else | |
822 | hpets = hpetp; | |
823 | ||
824 | last = hpetp; | |
825 | ||
826 | hpetp->hp_period = (cap & HPET_COUNTER_CLK_PERIOD_MASK) >> | |
827 | HPET_COUNTER_CLK_PERIOD_SHIFT; | |
828 | ||
829 | printk(KERN_INFO "hpet%d: at MMIO 0x%lx, IRQ%s", | |
830 | hpetp->hp_which, hdp->hd_phys_address, | |
831 | hpetp->hp_ntimer > 1 ? "s" : ""); | |
832 | for (i = 0; i < hpetp->hp_ntimer; i++) | |
833 | printk("%s %d", i > 0 ? "," : "", hdp->hd_irq[i]); | |
834 | printk("\n"); | |
835 | ||
836 | ns = hpetp->hp_period; /* femptoseconds, 10^-15 */ | |
44f410a7 | 837 | ns /= 1000000; /* convert to nanoseconds, 10^-9 */ |
1da177e4 LT |
838 | printk(KERN_INFO "hpet%d: %ldns tick, %d %d-bit timers\n", |
839 | hpetp->hp_which, ns, hpetp->hp_ntimer, | |
840 | cap & HPET_COUNTER_SIZE_MASK ? 64 : 32); | |
841 | ||
842 | mcfg = readq(&hpet->hpet_config); | |
843 | if ((mcfg & HPET_ENABLE_CNF_MASK) == 0) { | |
844 | write_counter(0L, &hpet->hpet_mc); | |
845 | mcfg |= HPET_ENABLE_CNF_MASK; | |
846 | writeq(mcfg, &hpet->hpet_config); | |
847 | } | |
848 | ||
849 | for (i = 0, devp = hpetp->hp_dev; i < hpetp->hp_ntimer; | |
850 | i++, hpet_ntimer++, devp++) { | |
851 | unsigned long v; | |
852 | struct hpet_timer __iomem *timer; | |
853 | ||
854 | timer = &hpet->hpet_timers[devp - hpetp->hp_dev]; | |
855 | v = readq(&timer->hpet_config); | |
856 | ||
857 | devp->hd_hpets = hpetp; | |
858 | devp->hd_hpet = hpet; | |
859 | devp->hd_timer = timer; | |
860 | ||
861 | /* | |
862 | * If the timer was reserved by platform code, | |
863 | * then make timer unavailable for opens. | |
864 | */ | |
865 | if (hdp->hd_state & (1 << i)) { | |
866 | devp->hd_flags = HPET_OPEN; | |
867 | continue; | |
868 | } | |
869 | ||
870 | init_waitqueue_head(&devp->hd_waitqueue); | |
871 | } | |
872 | ||
873 | hpetp->hp_delta = hpet_calibrate(hpetp); | |
874 | hpet_register_interpolator(hpetp); | |
875 | ||
876 | return 0; | |
877 | } | |
878 | ||
879 | static acpi_status hpet_resources(struct acpi_resource *res, void *data) | |
880 | { | |
881 | struct hpet_data *hdp; | |
882 | acpi_status status; | |
883 | struct acpi_resource_address64 addr; | |
884 | struct hpets *hpetp; | |
885 | ||
886 | hdp = data; | |
887 | ||
888 | status = acpi_resource_to_address64(res, &addr); | |
889 | ||
890 | if (ACPI_SUCCESS(status)) { | |
891 | unsigned long size; | |
892 | ||
893 | size = addr.max_address_range - addr.min_address_range + 1; | |
894 | hdp->hd_phys_address = addr.min_address_range; | |
895 | hdp->hd_address = ioremap(addr.min_address_range, size); | |
896 | ||
897 | for (hpetp = hpets; hpetp; hpetp = hpetp->hp_next) | |
898 | if (hpetp->hp_hpet == hdp->hd_address) | |
899 | return -EBUSY; | |
900 | } else if (res->id == ACPI_RSTYPE_EXT_IRQ) { | |
901 | struct acpi_resource_ext_irq *irqp; | |
902 | int i; | |
903 | ||
904 | irqp = &res->data.extended_irq; | |
905 | ||
906 | if (irqp->number_of_interrupts > 0) { | |
907 | hdp->hd_nirqs = irqp->number_of_interrupts; | |
908 | ||
a9bd53bc KK |
909 | for (i = 0; i < hdp->hd_nirqs; i++) { |
910 | int rc = | |
1da177e4 LT |
911 | acpi_register_gsi(irqp->interrupts[i], |
912 | irqp->edge_level, | |
913 | irqp->active_high_low); | |
a9bd53bc KK |
914 | if (rc < 0) |
915 | return AE_ERROR; | |
916 | hdp->hd_irq[i] = rc; | |
917 | } | |
1da177e4 LT |
918 | } |
919 | } | |
920 | ||
921 | return AE_OK; | |
922 | } | |
923 | ||
924 | static int hpet_acpi_add(struct acpi_device *device) | |
925 | { | |
926 | acpi_status result; | |
927 | struct hpet_data data; | |
928 | ||
929 | memset(&data, 0, sizeof(data)); | |
930 | ||
931 | result = | |
932 | acpi_walk_resources(device->handle, METHOD_NAME__CRS, | |
933 | hpet_resources, &data); | |
934 | ||
935 | if (ACPI_FAILURE(result)) | |
936 | return -ENODEV; | |
937 | ||
938 | if (!data.hd_address || !data.hd_nirqs) { | |
939 | printk("%s: no address or irqs in _CRS\n", __FUNCTION__); | |
940 | return -ENODEV; | |
941 | } | |
942 | ||
943 | return hpet_alloc(&data); | |
944 | } | |
945 | ||
946 | static int hpet_acpi_remove(struct acpi_device *device, int type) | |
947 | { | |
948 | /* XXX need to unregister interpolator, dealloc mem, etc */ | |
949 | return -EINVAL; | |
950 | } | |
951 | ||
952 | static struct acpi_driver hpet_acpi_driver = { | |
953 | .name = "hpet", | |
954 | .ids = "PNP0103", | |
955 | .ops = { | |
956 | .add = hpet_acpi_add, | |
957 | .remove = hpet_acpi_remove, | |
958 | }, | |
959 | }; | |
960 | ||
961 | static struct miscdevice hpet_misc = { HPET_MINOR, "hpet", &hpet_fops }; | |
962 | ||
963 | static int __init hpet_init(void) | |
964 | { | |
965 | int result; | |
966 | ||
967 | result = misc_register(&hpet_misc); | |
968 | if (result < 0) | |
969 | return -ENODEV; | |
970 | ||
971 | sysctl_header = register_sysctl_table(dev_root, 0); | |
972 | ||
973 | result = acpi_bus_register_driver(&hpet_acpi_driver); | |
974 | if (result < 0) { | |
975 | if (sysctl_header) | |
976 | unregister_sysctl_table(sysctl_header); | |
977 | misc_deregister(&hpet_misc); | |
978 | return result; | |
979 | } | |
980 | ||
981 | return 0; | |
982 | } | |
983 | ||
984 | static void __exit hpet_exit(void) | |
985 | { | |
986 | acpi_bus_unregister_driver(&hpet_acpi_driver); | |
987 | ||
988 | if (sysctl_header) | |
989 | unregister_sysctl_table(sysctl_header); | |
990 | misc_deregister(&hpet_misc); | |
991 | ||
992 | return; | |
993 | } | |
994 | ||
995 | module_init(hpet_init); | |
996 | module_exit(hpet_exit); | |
997 | MODULE_AUTHOR("Bob Picco <Robert.Picco@hp.com>"); | |
998 | MODULE_LICENSE("GPL"); |