Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Intel & MS High Precision Event Timer Implementation. | |
3 | * | |
4 | * Copyright (C) 2003 Intel Corporation | |
5 | * Venki Pallipadi | |
6 | * (c) Copyright 2004 Hewlett-Packard Development Company, L.P. | |
7 | * Bob Picco <robert.picco@hp.com> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | */ | |
13 | ||
1da177e4 LT |
14 | #include <linux/interrupt.h> |
15 | #include <linux/module.h> | |
16 | #include <linux/kernel.h> | |
17 | #include <linux/types.h> | |
18 | #include <linux/miscdevice.h> | |
19 | #include <linux/major.h> | |
20 | #include <linux/ioport.h> | |
21 | #include <linux/fcntl.h> | |
22 | #include <linux/init.h> | |
23 | #include <linux/poll.h> | |
f23f6e08 | 24 | #include <linux/mm.h> |
1da177e4 LT |
25 | #include <linux/proc_fs.h> |
26 | #include <linux/spinlock.h> | |
27 | #include <linux/sysctl.h> | |
28 | #include <linux/wait.h> | |
29 | #include <linux/bcd.h> | |
30 | #include <linux/seq_file.h> | |
31 | #include <linux/bitops.h> | |
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 | ||
757c4724 RD |
52 | #define HPET_RANGE_SIZE 1024 /* from HPET spec */ |
53 | ||
642d30bb | 54 | static u32 hpet_nhpet, hpet_max_freq = HPET_USER_FREQ; |
1da177e4 LT |
55 | |
56 | /* A lock for concurrent access by app and isr hpet activity. */ | |
57 | static DEFINE_SPINLOCK(hpet_lock); | |
58 | /* A lock for concurrent intermodule access to hpet and isr hpet activity. */ | |
59 | static DEFINE_SPINLOCK(hpet_task_lock); | |
60 | ||
61 | #define HPET_DEV_NAME (7) | |
62 | ||
63 | struct hpet_dev { | |
64 | struct hpets *hd_hpets; | |
65 | struct hpet __iomem *hd_hpet; | |
66 | struct hpet_timer __iomem *hd_timer; | |
67 | unsigned long hd_ireqfreq; | |
68 | unsigned long hd_irqdata; | |
69 | wait_queue_head_t hd_waitqueue; | |
70 | struct fasync_struct *hd_async_queue; | |
71 | struct hpet_task *hd_task; | |
72 | unsigned int hd_flags; | |
73 | unsigned int hd_irq; | |
74 | unsigned int hd_hdwirq; | |
75 | char hd_name[HPET_DEV_NAME]; | |
76 | }; | |
77 | ||
78 | struct hpets { | |
79 | struct hpets *hp_next; | |
80 | struct hpet __iomem *hp_hpet; | |
81 | unsigned long hp_hpet_phys; | |
82 | struct time_interpolator *hp_interpolator; | |
ba3f213f | 83 | unsigned long long hp_tick_freq; |
1da177e4 LT |
84 | unsigned long hp_delta; |
85 | unsigned int hp_ntimer; | |
86 | unsigned int hp_which; | |
87 | struct hpet_dev hp_dev[1]; | |
88 | }; | |
89 | ||
90 | static struct hpets *hpets; | |
91 | ||
92 | #define HPET_OPEN 0x0001 | |
93 | #define HPET_IE 0x0002 /* interrupt enabled */ | |
94 | #define HPET_PERIODIC 0x0004 | |
0d290861 | 95 | #define HPET_SHARED_IRQ 0x0008 |
1da177e4 LT |
96 | |
97 | #if BITS_PER_LONG == 64 | |
98 | #define write_counter(V, MC) writeq(V, MC) | |
99 | #define read_counter(MC) readq(MC) | |
100 | #else | |
101 | #define write_counter(V, MC) writel(V, MC) | |
102 | #define read_counter(MC) readl(MC) | |
103 | #endif | |
104 | ||
105 | #ifndef readq | |
887c27f3 | 106 | static inline unsigned long long readq(void __iomem *addr) |
1da177e4 LT |
107 | { |
108 | return readl(addr) | (((unsigned long long)readl(addr + 4)) << 32LL); | |
109 | } | |
110 | #endif | |
111 | ||
112 | #ifndef writeq | |
887c27f3 | 113 | static inline void writeq(unsigned long long v, void __iomem *addr) |
1da177e4 LT |
114 | { |
115 | writel(v & 0xffffffff, addr); | |
116 | writel(v >> 32, addr + 4); | |
117 | } | |
118 | #endif | |
119 | ||
7d12e780 | 120 | static irqreturn_t hpet_interrupt(int irq, void *data) |
1da177e4 LT |
121 | { |
122 | struct hpet_dev *devp; | |
123 | unsigned long isr; | |
124 | ||
125 | devp = data; | |
0d290861 CL |
126 | isr = 1 << (devp - devp->hd_hpets->hp_dev); |
127 | ||
128 | if ((devp->hd_flags & HPET_SHARED_IRQ) && | |
129 | !(isr & readl(&devp->hd_hpet->hpet_isr))) | |
130 | return IRQ_NONE; | |
1da177e4 LT |
131 | |
132 | spin_lock(&hpet_lock); | |
133 | devp->hd_irqdata++; | |
134 | ||
135 | /* | |
136 | * For non-periodic timers, increment the accumulator. | |
137 | * This has the effect of treating non-periodic like periodic. | |
138 | */ | |
139 | if ((devp->hd_flags & (HPET_IE | HPET_PERIODIC)) == HPET_IE) { | |
140 | unsigned long m, t; | |
141 | ||
142 | t = devp->hd_ireqfreq; | |
143 | m = read_counter(&devp->hd_hpet->hpet_mc); | |
144 | write_counter(t + m + devp->hd_hpets->hp_delta, | |
145 | &devp->hd_timer->hpet_compare); | |
146 | } | |
147 | ||
0d290861 CL |
148 | if (devp->hd_flags & HPET_SHARED_IRQ) |
149 | writel(isr, &devp->hd_hpet->hpet_isr); | |
1da177e4 LT |
150 | spin_unlock(&hpet_lock); |
151 | ||
152 | spin_lock(&hpet_task_lock); | |
153 | if (devp->hd_task) | |
154 | devp->hd_task->ht_func(devp->hd_task->ht_data); | |
155 | spin_unlock(&hpet_task_lock); | |
156 | ||
157 | wake_up_interruptible(&devp->hd_waitqueue); | |
158 | ||
159 | kill_fasync(&devp->hd_async_queue, SIGIO, POLL_IN); | |
160 | ||
161 | return IRQ_HANDLED; | |
162 | } | |
163 | ||
164 | static int hpet_open(struct inode *inode, struct file *file) | |
165 | { | |
166 | struct hpet_dev *devp; | |
167 | struct hpets *hpetp; | |
168 | int i; | |
169 | ||
170 | if (file->f_mode & FMODE_WRITE) | |
171 | return -EINVAL; | |
172 | ||
173 | spin_lock_irq(&hpet_lock); | |
174 | ||
175 | for (devp = NULL, hpetp = hpets; hpetp && !devp; hpetp = hpetp->hp_next) | |
176 | for (i = 0; i < hpetp->hp_ntimer; i++) | |
177 | if (hpetp->hp_dev[i].hd_flags & HPET_OPEN | |
178 | || hpetp->hp_dev[i].hd_task) | |
179 | continue; | |
180 | else { | |
181 | devp = &hpetp->hp_dev[i]; | |
182 | break; | |
183 | } | |
184 | ||
185 | if (!devp) { | |
186 | spin_unlock_irq(&hpet_lock); | |
187 | return -EBUSY; | |
188 | } | |
189 | ||
190 | file->private_data = devp; | |
191 | devp->hd_irqdata = 0; | |
192 | devp->hd_flags |= HPET_OPEN; | |
193 | spin_unlock_irq(&hpet_lock); | |
194 | ||
195 | return 0; | |
196 | } | |
197 | ||
198 | static ssize_t | |
199 | hpet_read(struct file *file, char __user *buf, size_t count, loff_t * ppos) | |
200 | { | |
201 | DECLARE_WAITQUEUE(wait, current); | |
202 | unsigned long data; | |
203 | ssize_t retval; | |
204 | struct hpet_dev *devp; | |
205 | ||
206 | devp = file->private_data; | |
207 | if (!devp->hd_ireqfreq) | |
208 | return -EIO; | |
209 | ||
210 | if (count < sizeof(unsigned long)) | |
211 | return -EINVAL; | |
212 | ||
213 | add_wait_queue(&devp->hd_waitqueue, &wait); | |
214 | ||
215 | for ( ; ; ) { | |
216 | set_current_state(TASK_INTERRUPTIBLE); | |
217 | ||
218 | spin_lock_irq(&hpet_lock); | |
219 | data = devp->hd_irqdata; | |
220 | devp->hd_irqdata = 0; | |
221 | spin_unlock_irq(&hpet_lock); | |
222 | ||
223 | if (data) | |
224 | break; | |
225 | else if (file->f_flags & O_NONBLOCK) { | |
226 | retval = -EAGAIN; | |
227 | goto out; | |
228 | } else if (signal_pending(current)) { | |
229 | retval = -ERESTARTSYS; | |
230 | goto out; | |
231 | } | |
232 | schedule(); | |
233 | } | |
234 | ||
235 | retval = put_user(data, (unsigned long __user *)buf); | |
236 | if (!retval) | |
237 | retval = sizeof(unsigned long); | |
238 | out: | |
239 | __set_current_state(TASK_RUNNING); | |
240 | remove_wait_queue(&devp->hd_waitqueue, &wait); | |
241 | ||
242 | return retval; | |
243 | } | |
244 | ||
245 | static unsigned int hpet_poll(struct file *file, poll_table * wait) | |
246 | { | |
247 | unsigned long v; | |
248 | struct hpet_dev *devp; | |
249 | ||
250 | devp = file->private_data; | |
251 | ||
252 | if (!devp->hd_ireqfreq) | |
253 | return 0; | |
254 | ||
255 | poll_wait(file, &devp->hd_waitqueue, wait); | |
256 | ||
257 | spin_lock_irq(&hpet_lock); | |
258 | v = devp->hd_irqdata; | |
259 | spin_unlock_irq(&hpet_lock); | |
260 | ||
261 | if (v != 0) | |
262 | return POLLIN | POLLRDNORM; | |
263 | ||
264 | return 0; | |
265 | } | |
266 | ||
267 | static int hpet_mmap(struct file *file, struct vm_area_struct *vma) | |
268 | { | |
269 | #ifdef CONFIG_HPET_MMAP | |
270 | struct hpet_dev *devp; | |
271 | unsigned long addr; | |
272 | ||
273 | if (((vma->vm_end - vma->vm_start) != PAGE_SIZE) || vma->vm_pgoff) | |
274 | return -EINVAL; | |
275 | ||
276 | devp = file->private_data; | |
277 | addr = devp->hd_hpets->hp_hpet_phys; | |
278 | ||
279 | if (addr & (PAGE_SIZE - 1)) | |
280 | return -ENOSYS; | |
281 | ||
282 | vma->vm_flags |= VM_IO; | |
283 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); | |
1da177e4 LT |
284 | |
285 | if (io_remap_pfn_range(vma, vma->vm_start, addr >> PAGE_SHIFT, | |
286 | PAGE_SIZE, vma->vm_page_prot)) { | |
3e6716e7 RD |
287 | printk(KERN_ERR "%s: io_remap_pfn_range failed\n", |
288 | __FUNCTION__); | |
1da177e4 LT |
289 | return -EAGAIN; |
290 | } | |
291 | ||
292 | return 0; | |
293 | #else | |
294 | return -ENOSYS; | |
295 | #endif | |
296 | } | |
297 | ||
298 | static int hpet_fasync(int fd, struct file *file, int on) | |
299 | { | |
300 | struct hpet_dev *devp; | |
301 | ||
302 | devp = file->private_data; | |
303 | ||
304 | if (fasync_helper(fd, file, on, &devp->hd_async_queue) >= 0) | |
305 | return 0; | |
306 | else | |
307 | return -EIO; | |
308 | } | |
309 | ||
310 | static int hpet_release(struct inode *inode, struct file *file) | |
311 | { | |
312 | struct hpet_dev *devp; | |
313 | struct hpet_timer __iomem *timer; | |
314 | int irq = 0; | |
315 | ||
316 | devp = file->private_data; | |
317 | timer = devp->hd_timer; | |
318 | ||
319 | spin_lock_irq(&hpet_lock); | |
320 | ||
321 | writeq((readq(&timer->hpet_config) & ~Tn_INT_ENB_CNF_MASK), | |
322 | &timer->hpet_config); | |
323 | ||
324 | irq = devp->hd_irq; | |
325 | devp->hd_irq = 0; | |
326 | ||
327 | devp->hd_ireqfreq = 0; | |
328 | ||
329 | if (devp->hd_flags & HPET_PERIODIC | |
330 | && readq(&timer->hpet_config) & Tn_TYPE_CNF_MASK) { | |
331 | unsigned long v; | |
332 | ||
333 | v = readq(&timer->hpet_config); | |
334 | v ^= Tn_TYPE_CNF_MASK; | |
335 | writeq(v, &timer->hpet_config); | |
336 | } | |
337 | ||
338 | devp->hd_flags &= ~(HPET_OPEN | HPET_IE | HPET_PERIODIC); | |
339 | spin_unlock_irq(&hpet_lock); | |
340 | ||
341 | if (irq) | |
342 | free_irq(irq, devp); | |
343 | ||
344 | if (file->f_flags & FASYNC) | |
345 | hpet_fasync(-1, file, 0); | |
346 | ||
347 | file->private_data = NULL; | |
348 | return 0; | |
349 | } | |
350 | ||
351 | static int hpet_ioctl_common(struct hpet_dev *, int, unsigned long, int); | |
352 | ||
353 | static int | |
354 | hpet_ioctl(struct inode *inode, struct file *file, unsigned int cmd, | |
355 | unsigned long arg) | |
356 | { | |
357 | struct hpet_dev *devp; | |
358 | ||
359 | devp = file->private_data; | |
360 | return hpet_ioctl_common(devp, cmd, arg, 0); | |
361 | } | |
362 | ||
363 | static int hpet_ioctl_ieon(struct hpet_dev *devp) | |
364 | { | |
365 | struct hpet_timer __iomem *timer; | |
366 | struct hpet __iomem *hpet; | |
367 | struct hpets *hpetp; | |
368 | int irq; | |
369 | unsigned long g, v, t, m; | |
370 | unsigned long flags, isr; | |
371 | ||
372 | timer = devp->hd_timer; | |
373 | hpet = devp->hd_hpet; | |
374 | hpetp = devp->hd_hpets; | |
375 | ||
9090e6db CL |
376 | if (!devp->hd_ireqfreq) |
377 | return -EIO; | |
378 | ||
1da177e4 LT |
379 | spin_lock_irq(&hpet_lock); |
380 | ||
381 | if (devp->hd_flags & HPET_IE) { | |
382 | spin_unlock_irq(&hpet_lock); | |
383 | return -EBUSY; | |
384 | } | |
385 | ||
386 | devp->hd_flags |= HPET_IE; | |
0d290861 CL |
387 | |
388 | if (readl(&timer->hpet_config) & Tn_INT_TYPE_CNF_MASK) | |
389 | devp->hd_flags |= HPET_SHARED_IRQ; | |
1da177e4 LT |
390 | spin_unlock_irq(&hpet_lock); |
391 | ||
1da177e4 LT |
392 | irq = devp->hd_hdwirq; |
393 | ||
394 | if (irq) { | |
0d290861 | 395 | unsigned long irq_flags; |
1da177e4 | 396 | |
0d290861 CL |
397 | sprintf(devp->hd_name, "hpet%d", (int)(devp - hpetp->hp_dev)); |
398 | irq_flags = devp->hd_flags & HPET_SHARED_IRQ | |
0f2ed4c6 | 399 | ? IRQF_SHARED : IRQF_DISABLED; |
0d290861 CL |
400 | if (request_irq(irq, hpet_interrupt, irq_flags, |
401 | devp->hd_name, (void *)devp)) { | |
1da177e4 LT |
402 | printk(KERN_ERR "hpet: IRQ %d is not free\n", irq); |
403 | irq = 0; | |
404 | } | |
405 | } | |
406 | ||
407 | if (irq == 0) { | |
408 | spin_lock_irq(&hpet_lock); | |
409 | devp->hd_flags ^= HPET_IE; | |
410 | spin_unlock_irq(&hpet_lock); | |
411 | return -EIO; | |
412 | } | |
413 | ||
414 | devp->hd_irq = irq; | |
415 | t = devp->hd_ireqfreq; | |
416 | v = readq(&timer->hpet_config); | |
417 | g = v | Tn_INT_ENB_CNF_MASK; | |
418 | ||
419 | if (devp->hd_flags & HPET_PERIODIC) { | |
420 | write_counter(t, &timer->hpet_compare); | |
421 | g |= Tn_TYPE_CNF_MASK; | |
422 | v |= Tn_TYPE_CNF_MASK; | |
423 | writeq(v, &timer->hpet_config); | |
424 | v |= Tn_VAL_SET_CNF_MASK; | |
425 | writeq(v, &timer->hpet_config); | |
426 | local_irq_save(flags); | |
427 | m = read_counter(&hpet->hpet_mc); | |
428 | write_counter(t + m + hpetp->hp_delta, &timer->hpet_compare); | |
429 | } else { | |
430 | local_irq_save(flags); | |
431 | m = read_counter(&hpet->hpet_mc); | |
432 | write_counter(t + m + hpetp->hp_delta, &timer->hpet_compare); | |
433 | } | |
434 | ||
0d290861 | 435 | if (devp->hd_flags & HPET_SHARED_IRQ) { |
3d5640d1 | 436 | isr = 1 << (devp - devp->hd_hpets->hp_dev); |
0d290861 CL |
437 | writel(isr, &hpet->hpet_isr); |
438 | } | |
1da177e4 LT |
439 | writeq(g, &timer->hpet_config); |
440 | local_irq_restore(flags); | |
441 | ||
442 | return 0; | |
443 | } | |
444 | ||
ba3f213f CL |
445 | /* converts Hz to number of timer ticks */ |
446 | static inline unsigned long hpet_time_div(struct hpets *hpets, | |
447 | unsigned long dis) | |
1da177e4 | 448 | { |
ba3f213f | 449 | unsigned long long m; |
1da177e4 | 450 | |
ba3f213f | 451 | m = hpets->hp_tick_freq + (dis >> 1); |
1da177e4 | 452 | do_div(m, dis); |
1da177e4 LT |
453 | return (unsigned long)m; |
454 | } | |
455 | ||
456 | static int | |
457 | hpet_ioctl_common(struct hpet_dev *devp, int cmd, unsigned long arg, int kernel) | |
458 | { | |
459 | struct hpet_timer __iomem *timer; | |
460 | struct hpet __iomem *hpet; | |
461 | struct hpets *hpetp; | |
462 | int err; | |
463 | unsigned long v; | |
464 | ||
465 | switch (cmd) { | |
466 | case HPET_IE_OFF: | |
467 | case HPET_INFO: | |
468 | case HPET_EPI: | |
469 | case HPET_DPI: | |
470 | case HPET_IRQFREQ: | |
471 | timer = devp->hd_timer; | |
472 | hpet = devp->hd_hpet; | |
473 | hpetp = devp->hd_hpets; | |
474 | break; | |
475 | case HPET_IE_ON: | |
476 | return hpet_ioctl_ieon(devp); | |
477 | default: | |
478 | return -EINVAL; | |
479 | } | |
480 | ||
481 | err = 0; | |
482 | ||
483 | switch (cmd) { | |
484 | case HPET_IE_OFF: | |
485 | if ((devp->hd_flags & HPET_IE) == 0) | |
486 | break; | |
487 | v = readq(&timer->hpet_config); | |
488 | v &= ~Tn_INT_ENB_CNF_MASK; | |
489 | writeq(v, &timer->hpet_config); | |
490 | if (devp->hd_irq) { | |
491 | free_irq(devp->hd_irq, devp); | |
492 | devp->hd_irq = 0; | |
493 | } | |
494 | devp->hd_flags ^= HPET_IE; | |
495 | break; | |
496 | case HPET_INFO: | |
497 | { | |
498 | struct hpet_info info; | |
499 | ||
af95eade CL |
500 | if (devp->hd_ireqfreq) |
501 | info.hi_ireqfreq = | |
502 | hpet_time_div(hpetp, devp->hd_ireqfreq); | |
503 | else | |
504 | info.hi_ireqfreq = 0; | |
1da177e4 LT |
505 | info.hi_flags = |
506 | readq(&timer->hpet_config) & Tn_PER_INT_CAP_MASK; | |
c860ed9f CL |
507 | info.hi_hpet = hpetp->hp_which; |
508 | info.hi_timer = devp - hpetp->hp_dev; | |
8e8505be CL |
509 | if (kernel) |
510 | memcpy((void *)arg, &info, sizeof(info)); | |
511 | else | |
512 | if (copy_to_user((void __user *)arg, &info, | |
513 | sizeof(info))) | |
514 | err = -EFAULT; | |
1da177e4 LT |
515 | break; |
516 | } | |
517 | case HPET_EPI: | |
518 | v = readq(&timer->hpet_config); | |
519 | if ((v & Tn_PER_INT_CAP_MASK) == 0) { | |
520 | err = -ENXIO; | |
521 | break; | |
522 | } | |
523 | devp->hd_flags |= HPET_PERIODIC; | |
524 | break; | |
525 | case HPET_DPI: | |
526 | v = readq(&timer->hpet_config); | |
527 | if ((v & Tn_PER_INT_CAP_MASK) == 0) { | |
528 | err = -ENXIO; | |
529 | break; | |
530 | } | |
531 | if (devp->hd_flags & HPET_PERIODIC && | |
532 | readq(&timer->hpet_config) & Tn_TYPE_CNF_MASK) { | |
533 | v = readq(&timer->hpet_config); | |
534 | v ^= Tn_TYPE_CNF_MASK; | |
535 | writeq(v, &timer->hpet_config); | |
536 | } | |
537 | devp->hd_flags &= ~HPET_PERIODIC; | |
538 | break; | |
539 | case HPET_IRQFREQ: | |
540 | if (!kernel && (arg > hpet_max_freq) && | |
541 | !capable(CAP_SYS_RESOURCE)) { | |
542 | err = -EACCES; | |
543 | break; | |
544 | } | |
545 | ||
189e2dd1 | 546 | if (!arg) { |
1da177e4 LT |
547 | err = -EINVAL; |
548 | break; | |
549 | } | |
550 | ||
ba3f213f | 551 | devp->hd_ireqfreq = hpet_time_div(hpetp, arg); |
1da177e4 LT |
552 | } |
553 | ||
554 | return err; | |
555 | } | |
556 | ||
62322d25 | 557 | static const struct file_operations hpet_fops = { |
1da177e4 LT |
558 | .owner = THIS_MODULE, |
559 | .llseek = no_llseek, | |
560 | .read = hpet_read, | |
561 | .poll = hpet_poll, | |
562 | .ioctl = hpet_ioctl, | |
563 | .open = hpet_open, | |
564 | .release = hpet_release, | |
565 | .fasync = hpet_fasync, | |
566 | .mmap = hpet_mmap, | |
567 | }; | |
568 | ||
3e6716e7 RD |
569 | static int hpet_is_known(struct hpet_data *hdp) |
570 | { | |
571 | struct hpets *hpetp; | |
572 | ||
573 | for (hpetp = hpets; hpetp; hpetp = hpetp->hp_next) | |
574 | if (hpetp->hp_hpet_phys == hdp->hd_phys_address) | |
575 | return 1; | |
576 | ||
577 | return 0; | |
578 | } | |
579 | ||
1da177e4 LT |
580 | EXPORT_SYMBOL(hpet_alloc); |
581 | EXPORT_SYMBOL(hpet_register); | |
582 | EXPORT_SYMBOL(hpet_unregister); | |
583 | EXPORT_SYMBOL(hpet_control); | |
584 | ||
585 | int hpet_register(struct hpet_task *tp, int periodic) | |
586 | { | |
587 | unsigned int i; | |
588 | u64 mask; | |
589 | struct hpet_timer __iomem *timer; | |
590 | struct hpet_dev *devp; | |
591 | struct hpets *hpetp; | |
592 | ||
593 | switch (periodic) { | |
594 | case 1: | |
595 | mask = Tn_PER_INT_CAP_MASK; | |
596 | break; | |
597 | case 0: | |
598 | mask = 0; | |
599 | break; | |
600 | default: | |
601 | return -EINVAL; | |
602 | } | |
603 | ||
7522e4ec CL |
604 | tp->ht_opaque = NULL; |
605 | ||
1da177e4 LT |
606 | spin_lock_irq(&hpet_task_lock); |
607 | spin_lock(&hpet_lock); | |
608 | ||
609 | for (devp = NULL, hpetp = hpets; hpetp && !devp; hpetp = hpetp->hp_next) | |
610 | for (timer = hpetp->hp_hpet->hpet_timers, i = 0; | |
611 | i < hpetp->hp_ntimer; i++, timer++) { | |
612 | if ((readq(&timer->hpet_config) & Tn_PER_INT_CAP_MASK) | |
613 | != mask) | |
614 | continue; | |
615 | ||
616 | devp = &hpetp->hp_dev[i]; | |
617 | ||
618 | if (devp->hd_flags & HPET_OPEN || devp->hd_task) { | |
619 | devp = NULL; | |
620 | continue; | |
621 | } | |
622 | ||
623 | tp->ht_opaque = devp; | |
624 | devp->hd_task = tp; | |
625 | break; | |
626 | } | |
627 | ||
628 | spin_unlock(&hpet_lock); | |
629 | spin_unlock_irq(&hpet_task_lock); | |
630 | ||
631 | if (tp->ht_opaque) | |
632 | return 0; | |
633 | else | |
634 | return -EBUSY; | |
635 | } | |
636 | ||
637 | static inline int hpet_tpcheck(struct hpet_task *tp) | |
638 | { | |
639 | struct hpet_dev *devp; | |
640 | struct hpets *hpetp; | |
641 | ||
642 | devp = tp->ht_opaque; | |
643 | ||
644 | if (!devp) | |
645 | return -ENXIO; | |
646 | ||
647 | for (hpetp = hpets; hpetp; hpetp = hpetp->hp_next) | |
648 | if (devp >= hpetp->hp_dev | |
649 | && devp < (hpetp->hp_dev + hpetp->hp_ntimer) | |
650 | && devp->hd_hpet == hpetp->hp_hpet) | |
651 | return 0; | |
652 | ||
653 | return -ENXIO; | |
654 | } | |
655 | ||
656 | int hpet_unregister(struct hpet_task *tp) | |
657 | { | |
658 | struct hpet_dev *devp; | |
659 | struct hpet_timer __iomem *timer; | |
660 | int err; | |
661 | ||
662 | if ((err = hpet_tpcheck(tp))) | |
663 | return err; | |
664 | ||
665 | spin_lock_irq(&hpet_task_lock); | |
666 | spin_lock(&hpet_lock); | |
667 | ||
668 | devp = tp->ht_opaque; | |
669 | if (devp->hd_task != tp) { | |
670 | spin_unlock(&hpet_lock); | |
671 | spin_unlock_irq(&hpet_task_lock); | |
672 | return -ENXIO; | |
673 | } | |
674 | ||
675 | timer = devp->hd_timer; | |
676 | writeq((readq(&timer->hpet_config) & ~Tn_INT_ENB_CNF_MASK), | |
677 | &timer->hpet_config); | |
678 | devp->hd_flags &= ~(HPET_IE | HPET_PERIODIC); | |
679 | devp->hd_task = NULL; | |
680 | spin_unlock(&hpet_lock); | |
681 | spin_unlock_irq(&hpet_task_lock); | |
682 | ||
683 | return 0; | |
684 | } | |
685 | ||
686 | int hpet_control(struct hpet_task *tp, unsigned int cmd, unsigned long arg) | |
687 | { | |
688 | struct hpet_dev *devp; | |
689 | int err; | |
690 | ||
691 | if ((err = hpet_tpcheck(tp))) | |
692 | return err; | |
693 | ||
694 | spin_lock_irq(&hpet_lock); | |
695 | devp = tp->ht_opaque; | |
696 | if (devp->hd_task != tp) { | |
697 | spin_unlock_irq(&hpet_lock); | |
698 | return -ENXIO; | |
699 | } | |
700 | spin_unlock_irq(&hpet_lock); | |
701 | return hpet_ioctl_common(devp, cmd, arg, 1); | |
702 | } | |
703 | ||
704 | static ctl_table hpet_table[] = { | |
705 | { | |
22943364 | 706 | .ctl_name = CTL_UNNUMBERED, |
1da177e4 LT |
707 | .procname = "max-user-freq", |
708 | .data = &hpet_max_freq, | |
709 | .maxlen = sizeof(int), | |
710 | .mode = 0644, | |
711 | .proc_handler = &proc_dointvec, | |
712 | }, | |
713 | {.ctl_name = 0} | |
714 | }; | |
715 | ||
716 | static ctl_table hpet_root[] = { | |
717 | { | |
22943364 | 718 | .ctl_name = CTL_UNNUMBERED, |
1da177e4 LT |
719 | .procname = "hpet", |
720 | .maxlen = 0, | |
721 | .mode = 0555, | |
722 | .child = hpet_table, | |
723 | }, | |
724 | {.ctl_name = 0} | |
725 | }; | |
726 | ||
727 | static ctl_table dev_root[] = { | |
728 | { | |
729 | .ctl_name = CTL_DEV, | |
730 | .procname = "dev", | |
731 | .maxlen = 0, | |
732 | .mode = 0555, | |
733 | .child = hpet_root, | |
734 | }, | |
735 | {.ctl_name = 0} | |
736 | }; | |
737 | ||
738 | static struct ctl_table_header *sysctl_header; | |
739 | ||
740 | static void hpet_register_interpolator(struct hpets *hpetp) | |
741 | { | |
742 | #ifdef CONFIG_TIME_INTERPOLATION | |
743 | struct time_interpolator *ti; | |
744 | ||
3e6716e7 | 745 | ti = kzalloc(sizeof(*ti), GFP_KERNEL); |
1da177e4 LT |
746 | if (!ti) |
747 | return; | |
748 | ||
1da177e4 LT |
749 | ti->source = TIME_SOURCE_MMIO64; |
750 | ti->shift = 10; | |
751 | ti->addr = &hpetp->hp_hpet->hpet_mc; | |
ba3f213f | 752 | ti->frequency = hpetp->hp_tick_freq; |
96803820 | 753 | ti->drift = HPET_DRIFT; |
1da177e4 LT |
754 | ti->mask = -1; |
755 | ||
756 | hpetp->hp_interpolator = ti; | |
757 | register_time_interpolator(ti); | |
758 | #endif | |
759 | } | |
760 | ||
761 | /* | |
762 | * Adjustment for when arming the timer with | |
763 | * initial conditions. That is, main counter | |
764 | * ticks expired before interrupts are enabled. | |
765 | */ | |
766 | #define TICK_CALIBRATE (1000UL) | |
767 | ||
768 | static unsigned long hpet_calibrate(struct hpets *hpetp) | |
769 | { | |
770 | struct hpet_timer __iomem *timer = NULL; | |
771 | unsigned long t, m, count, i, flags, start; | |
772 | struct hpet_dev *devp; | |
773 | int j; | |
774 | struct hpet __iomem *hpet; | |
775 | ||
776 | for (j = 0, devp = hpetp->hp_dev; j < hpetp->hp_ntimer; j++, devp++) | |
777 | if ((devp->hd_flags & HPET_OPEN) == 0) { | |
778 | timer = devp->hd_timer; | |
779 | break; | |
780 | } | |
781 | ||
782 | if (!timer) | |
783 | return 0; | |
784 | ||
3d5640d1 | 785 | hpet = hpetp->hp_hpet; |
1da177e4 LT |
786 | t = read_counter(&timer->hpet_compare); |
787 | ||
788 | i = 0; | |
ba3f213f | 789 | count = hpet_time_div(hpetp, TICK_CALIBRATE); |
1da177e4 LT |
790 | |
791 | local_irq_save(flags); | |
792 | ||
793 | start = read_counter(&hpet->hpet_mc); | |
794 | ||
795 | do { | |
796 | m = read_counter(&hpet->hpet_mc); | |
797 | write_counter(t + m + hpetp->hp_delta, &timer->hpet_compare); | |
798 | } while (i++, (m - start) < count); | |
799 | ||
800 | local_irq_restore(flags); | |
801 | ||
802 | return (m - start) / i; | |
803 | } | |
804 | ||
805 | int hpet_alloc(struct hpet_data *hdp) | |
806 | { | |
807 | u64 cap, mcfg; | |
808 | struct hpet_dev *devp; | |
809 | u32 i, ntimer; | |
810 | struct hpets *hpetp; | |
811 | size_t siz; | |
812 | struct hpet __iomem *hpet; | |
3e6716e7 | 813 | static struct hpets *last = NULL; |
318db8f0 | 814 | unsigned long period; |
ba3f213f | 815 | unsigned long long temp; |
1da177e4 LT |
816 | |
817 | /* | |
818 | * hpet_alloc can be called by platform dependent code. | |
3e6716e7 RD |
819 | * If platform dependent code has allocated the hpet that |
820 | * ACPI has also reported, then we catch it here. | |
1da177e4 | 821 | */ |
3e6716e7 RD |
822 | if (hpet_is_known(hdp)) { |
823 | printk(KERN_DEBUG "%s: duplicate HPET ignored\n", | |
824 | __FUNCTION__); | |
825 | return 0; | |
826 | } | |
1da177e4 LT |
827 | |
828 | siz = sizeof(struct hpets) + ((hdp->hd_nirqs - 1) * | |
829 | sizeof(struct hpet_dev)); | |
830 | ||
3e6716e7 | 831 | hpetp = kzalloc(siz, GFP_KERNEL); |
1da177e4 LT |
832 | |
833 | if (!hpetp) | |
834 | return -ENOMEM; | |
835 | ||
1da177e4 LT |
836 | hpetp->hp_which = hpet_nhpet++; |
837 | hpetp->hp_hpet = hdp->hd_address; | |
838 | hpetp->hp_hpet_phys = hdp->hd_phys_address; | |
839 | ||
840 | hpetp->hp_ntimer = hdp->hd_nirqs; | |
841 | ||
842 | for (i = 0; i < hdp->hd_nirqs; i++) | |
843 | hpetp->hp_dev[i].hd_hdwirq = hdp->hd_irq[i]; | |
844 | ||
845 | hpet = hpetp->hp_hpet; | |
846 | ||
847 | cap = readq(&hpet->hpet_cap); | |
848 | ||
849 | ntimer = ((cap & HPET_NUM_TIM_CAP_MASK) >> HPET_NUM_TIM_CAP_SHIFT) + 1; | |
850 | ||
851 | if (hpetp->hp_ntimer != ntimer) { | |
852 | printk(KERN_WARNING "hpet: number irqs doesn't agree" | |
853 | " with number of timers\n"); | |
854 | kfree(hpetp); | |
855 | return -ENODEV; | |
856 | } | |
857 | ||
858 | if (last) | |
859 | last->hp_next = hpetp; | |
860 | else | |
861 | hpets = hpetp; | |
862 | ||
863 | last = hpetp; | |
864 | ||
ba3f213f CL |
865 | period = (cap & HPET_COUNTER_CLK_PERIOD_MASK) >> |
866 | HPET_COUNTER_CLK_PERIOD_SHIFT; /* fs, 10^-15 */ | |
867 | temp = 1000000000000000uLL; /* 10^15 femtoseconds per second */ | |
868 | temp += period >> 1; /* round */ | |
869 | do_div(temp, period); | |
870 | hpetp->hp_tick_freq = temp; /* ticks per second */ | |
1da177e4 | 871 | |
3034d11c AK |
872 | printk(KERN_INFO "hpet%d: at MMIO 0x%lx, IRQ%s", |
873 | hpetp->hp_which, hdp->hd_phys_address, | |
1da177e4 LT |
874 | hpetp->hp_ntimer > 1 ? "s" : ""); |
875 | for (i = 0; i < hpetp->hp_ntimer; i++) | |
876 | printk("%s %d", i > 0 ? "," : "", hdp->hd_irq[i]); | |
877 | printk("\n"); | |
878 | ||
318db8f0 CL |
879 | printk(KERN_INFO "hpet%u: %u %d-bit timers, %Lu Hz\n", |
880 | hpetp->hp_which, hpetp->hp_ntimer, | |
881 | cap & HPET_COUNTER_SIZE_MASK ? 64 : 32, hpetp->hp_tick_freq); | |
1da177e4 LT |
882 | |
883 | mcfg = readq(&hpet->hpet_config); | |
884 | if ((mcfg & HPET_ENABLE_CNF_MASK) == 0) { | |
885 | write_counter(0L, &hpet->hpet_mc); | |
886 | mcfg |= HPET_ENABLE_CNF_MASK; | |
887 | writeq(mcfg, &hpet->hpet_config); | |
888 | } | |
889 | ||
642d30bb | 890 | for (i = 0, devp = hpetp->hp_dev; i < hpetp->hp_ntimer; i++, devp++) { |
1da177e4 LT |
891 | struct hpet_timer __iomem *timer; |
892 | ||
893 | timer = &hpet->hpet_timers[devp - hpetp->hp_dev]; | |
1da177e4 LT |
894 | |
895 | devp->hd_hpets = hpetp; | |
896 | devp->hd_hpet = hpet; | |
897 | devp->hd_timer = timer; | |
898 | ||
899 | /* | |
900 | * If the timer was reserved by platform code, | |
901 | * then make timer unavailable for opens. | |
902 | */ | |
903 | if (hdp->hd_state & (1 << i)) { | |
904 | devp->hd_flags = HPET_OPEN; | |
905 | continue; | |
906 | } | |
907 | ||
908 | init_waitqueue_head(&devp->hd_waitqueue); | |
909 | } | |
910 | ||
911 | hpetp->hp_delta = hpet_calibrate(hpetp); | |
912 | hpet_register_interpolator(hpetp); | |
913 | ||
914 | return 0; | |
915 | } | |
916 | ||
917 | static acpi_status hpet_resources(struct acpi_resource *res, void *data) | |
918 | { | |
919 | struct hpet_data *hdp; | |
920 | acpi_status status; | |
921 | struct acpi_resource_address64 addr; | |
1da177e4 LT |
922 | |
923 | hdp = data; | |
924 | ||
925 | status = acpi_resource_to_address64(res, &addr); | |
926 | ||
927 | if (ACPI_SUCCESS(status)) { | |
50eca3eb | 928 | hdp->hd_phys_address = addr.minimum; |
9224a867 | 929 | hdp->hd_address = ioremap(addr.minimum, addr.address_length); |
1da177e4 | 930 | |
3e6716e7 RD |
931 | if (hpet_is_known(hdp)) { |
932 | printk(KERN_DEBUG "%s: 0x%lx is busy\n", | |
933 | __FUNCTION__, hdp->hd_phys_address); | |
934 | iounmap(hdp->hd_address); | |
935 | return -EBUSY; | |
936 | } | |
50eca3eb BM |
937 | } else if (res->type == ACPI_RESOURCE_TYPE_FIXED_MEMORY32) { |
938 | struct acpi_resource_fixed_memory32 *fixmem32; | |
757c4724 RD |
939 | |
940 | fixmem32 = &res->data.fixed_memory32; | |
941 | if (!fixmem32) | |
942 | return -EINVAL; | |
943 | ||
50eca3eb BM |
944 | hdp->hd_phys_address = fixmem32->address; |
945 | hdp->hd_address = ioremap(fixmem32->address, | |
757c4724 RD |
946 | HPET_RANGE_SIZE); |
947 | ||
3e6716e7 RD |
948 | if (hpet_is_known(hdp)) { |
949 | printk(KERN_DEBUG "%s: 0x%lx is busy\n", | |
950 | __FUNCTION__, hdp->hd_phys_address); | |
951 | iounmap(hdp->hd_address); | |
952 | return -EBUSY; | |
953 | } | |
50eca3eb BM |
954 | } else if (res->type == ACPI_RESOURCE_TYPE_EXTENDED_IRQ) { |
955 | struct acpi_resource_extended_irq *irqp; | |
be5efffb | 956 | int i, irq; |
1da177e4 LT |
957 | |
958 | irqp = &res->data.extended_irq; | |
959 | ||
be5efffb BH |
960 | for (i = 0; i < irqp->interrupt_count; i++) { |
961 | irq = acpi_register_gsi(irqp->interrupts[i], | |
962 | irqp->triggering, irqp->polarity); | |
963 | if (irq < 0) | |
964 | return AE_ERROR; | |
965 | ||
966 | hdp->hd_irq[hdp->hd_nirqs] = irq; | |
967 | hdp->hd_nirqs++; | |
1da177e4 LT |
968 | } |
969 | } | |
970 | ||
971 | return AE_OK; | |
972 | } | |
973 | ||
974 | static int hpet_acpi_add(struct acpi_device *device) | |
975 | { | |
976 | acpi_status result; | |
977 | struct hpet_data data; | |
978 | ||
979 | memset(&data, 0, sizeof(data)); | |
980 | ||
981 | result = | |
982 | acpi_walk_resources(device->handle, METHOD_NAME__CRS, | |
983 | hpet_resources, &data); | |
984 | ||
985 | if (ACPI_FAILURE(result)) | |
986 | return -ENODEV; | |
987 | ||
988 | if (!data.hd_address || !data.hd_nirqs) { | |
989 | printk("%s: no address or irqs in _CRS\n", __FUNCTION__); | |
990 | return -ENODEV; | |
991 | } | |
992 | ||
993 | return hpet_alloc(&data); | |
994 | } | |
995 | ||
996 | static int hpet_acpi_remove(struct acpi_device *device, int type) | |
997 | { | |
998 | /* XXX need to unregister interpolator, dealloc mem, etc */ | |
999 | return -EINVAL; | |
1000 | } | |
1001 | ||
1002 | static struct acpi_driver hpet_acpi_driver = { | |
1003 | .name = "hpet", | |
1004 | .ids = "PNP0103", | |
1005 | .ops = { | |
1006 | .add = hpet_acpi_add, | |
1007 | .remove = hpet_acpi_remove, | |
1008 | }, | |
1009 | }; | |
1010 | ||
1011 | static struct miscdevice hpet_misc = { HPET_MINOR, "hpet", &hpet_fops }; | |
1012 | ||
1013 | static int __init hpet_init(void) | |
1014 | { | |
1015 | int result; | |
1016 | ||
1017 | result = misc_register(&hpet_misc); | |
1018 | if (result < 0) | |
1019 | return -ENODEV; | |
1020 | ||
0b4d4147 | 1021 | sysctl_header = register_sysctl_table(dev_root); |
1da177e4 LT |
1022 | |
1023 | result = acpi_bus_register_driver(&hpet_acpi_driver); | |
1024 | if (result < 0) { | |
1025 | if (sysctl_header) | |
1026 | unregister_sysctl_table(sysctl_header); | |
1027 | misc_deregister(&hpet_misc); | |
1028 | return result; | |
1029 | } | |
1030 | ||
1031 | return 0; | |
1032 | } | |
1033 | ||
1034 | static void __exit hpet_exit(void) | |
1035 | { | |
1036 | acpi_bus_unregister_driver(&hpet_acpi_driver); | |
1037 | ||
1038 | if (sysctl_header) | |
1039 | unregister_sysctl_table(sysctl_header); | |
1040 | misc_deregister(&hpet_misc); | |
1041 | ||
1042 | return; | |
1043 | } | |
1044 | ||
1045 | module_init(hpet_init); | |
1046 | module_exit(hpet_exit); | |
1047 | MODULE_AUTHOR("Bob Picco <Robert.Picco@hp.com>"); | |
1048 | MODULE_LICENSE("GPL"); |