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pty: simplify unix98 allocation
[linux-2.6/sactl.git] / drivers / char / hpet.c
blobb3f5dbc6d8807c7a51cf352118bf5ea08e35d635
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/interrupt.h>
15 #include <linux/module.h>
16 #include <linux/kernel.h>
17 #include <linux/smp_lock.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/mm.h>
26 #include <linux/proc_fs.h>
27 #include <linux/spinlock.h>
28 #include <linux/sysctl.h>
29 #include <linux/wait.h>
30 #include <linux/bcd.h>
31 #include <linux/seq_file.h>
32 #include <linux/bitops.h>
33 #include <linux/clocksource.h>
34
35 #include <asm/current.h>
36 #include <asm/uaccess.h>
37 #include <asm/system.h>
38 #include <asm/io.h>
39 #include <asm/irq.h>
40 #include <asm/div64.h>
41
42 #include <linux/acpi.h>
43 #include <acpi/acpi_bus.h>
44 #include <linux/hpet.h>
45
46 /*
47 * The High Precision Event Timer driver.
48 * This driver is closely modelled after the rtc.c driver.
49 * http://www.intel.com/hardwaredesign/hpetspec.htm
50 */
51 #define HPET_USER_FREQ (64)
52 #define HPET_DRIFT (500)
53
54 #define HPET_RANGE_SIZE 1024 /* from HPET spec */
55
56 #if BITS_PER_LONG == 64
57 #define write_counter(V, MC) writeq(V, MC)
58 #define read_counter(MC) readq(MC)
59 #else
60 #define write_counter(V, MC) writel(V, MC)
61 #define read_counter(MC) readl(MC)
62 #endif
63
64 static u32 hpet_nhpet, hpet_max_freq = HPET_USER_FREQ;
65
66 /* This clocksource driver currently only works on ia64 */
67 #ifdef CONFIG_IA64
68 static void __iomem *hpet_mctr;
69
70 static cycle_t read_hpet(void)
71 {
72 return (cycle_t)read_counter((void __iomem *)hpet_mctr);
73 }
74
75 static struct clocksource clocksource_hpet = {
76 .name = "hpet",
77 .rating = 250,
78 .read = read_hpet,
79 .mask = CLOCKSOURCE_MASK(64),
80 .mult = 0, /*to be caluclated*/
81 .shift = 10,
82 .flags = CLOCK_SOURCE_IS_CONTINUOUS,
83 };
84 static struct clocksource *hpet_clocksource;
85 #endif
86
87 /* A lock for concurrent access by app and isr hpet activity. */
88 static DEFINE_SPINLOCK(hpet_lock);
89 /* A lock for concurrent intermodule access to hpet and isr hpet activity. */
90 static DEFINE_SPINLOCK(hpet_task_lock);
91
92 #define HPET_DEV_NAME (7)
93
94 struct hpet_dev {
95 struct hpets *hd_hpets;
96 struct hpet __iomem *hd_hpet;
97 struct hpet_timer __iomem *hd_timer;
98 unsigned long hd_ireqfreq;
99 unsigned long hd_irqdata;
100 wait_queue_head_t hd_waitqueue;
101 struct fasync_struct *hd_async_queue;
102 struct hpet_task *hd_task;
103 unsigned int hd_flags;
104 unsigned int hd_irq;
105 unsigned int hd_hdwirq;
106 char hd_name[HPET_DEV_NAME];
107 };
108
109 struct hpets {
110 struct hpets *hp_next;
111 struct hpet __iomem *hp_hpet;
112 unsigned long hp_hpet_phys;
113 struct clocksource *hp_clocksource;
114 unsigned long long hp_tick_freq;
115 unsigned long hp_delta;
116 unsigned int hp_ntimer;
117 unsigned int hp_which;
118 struct hpet_dev hp_dev[1];
119 };
120
121 static struct hpets *hpets;
122
123 #define HPET_OPEN 0x0001
124 #define HPET_IE 0x0002 /* interrupt enabled */
125 #define HPET_PERIODIC 0x0004
126 #define HPET_SHARED_IRQ 0x0008
127
128
129 #ifndef readq
130 static inline unsigned long long readq(void __iomem *addr)
131 {
132 return readl(addr) | (((unsigned long long)readl(addr + 4)) << 32LL);
133 }
134 #endif
135
136 #ifndef writeq
137 static inline void writeq(unsigned long long v, void __iomem *addr)
138 {
139 writel(v & 0xffffffff, addr);
140 writel(v >> 32, addr + 4);
141 }
142 #endif
143
144 static irqreturn_t hpet_interrupt(int irq, void *data)
145 {
146 struct hpet_dev *devp;
147 unsigned long isr;
148
149 devp = data;
150 isr = 1 << (devp - devp->hd_hpets->hp_dev);
151
152 if ((devp->hd_flags & HPET_SHARED_IRQ) &&
153 !(isr & readl(&devp->hd_hpet->hpet_isr)))
154 return IRQ_NONE;
155
156 spin_lock(&hpet_lock);
157 devp->hd_irqdata++;
158
159 /*
160 * For non-periodic timers, increment the accumulator.
161 * This has the effect of treating non-periodic like periodic.
162 */
163 if ((devp->hd_flags & (HPET_IE | HPET_PERIODIC)) == HPET_IE) {
164 unsigned long m, t;
165
166 t = devp->hd_ireqfreq;
167 m = read_counter(&devp->hd_hpet->hpet_mc);
168 write_counter(t + m + devp->hd_hpets->hp_delta,
169 &devp->hd_timer->hpet_compare);
170 }
171
172 if (devp->hd_flags & HPET_SHARED_IRQ)
173 writel(isr, &devp->hd_hpet->hpet_isr);
174 spin_unlock(&hpet_lock);
175
176 spin_lock(&hpet_task_lock);
177 if (devp->hd_task)
178 devp->hd_task->ht_func(devp->hd_task->ht_data);
179 spin_unlock(&hpet_task_lock);
180
181 wake_up_interruptible(&devp->hd_waitqueue);
182
183 kill_fasync(&devp->hd_async_queue, SIGIO, POLL_IN);
184
185 return IRQ_HANDLED;
186 }
187
188 static int hpet_open(struct inode *inode, struct file *file)
189 {
190 struct hpet_dev *devp;
191 struct hpets *hpetp;
192 int i;
193
194 if (file->f_mode & FMODE_WRITE)
195 return -EINVAL;
196
197 lock_kernel();
198 spin_lock_irq(&hpet_lock);
199
200 for (devp = NULL, hpetp = hpets; hpetp && !devp; hpetp = hpetp->hp_next)
201 for (i = 0; i < hpetp->hp_ntimer; i++)
202 if (hpetp->hp_dev[i].hd_flags & HPET_OPEN
203 || hpetp->hp_dev[i].hd_task)
204 continue;
205 else {
206 devp = &hpetp->hp_dev[i];
207 break;
208 }
209
210 if (!devp) {
211 spin_unlock_irq(&hpet_lock);
212 unlock_kernel();
213 return -EBUSY;
214 }
215
216 file->private_data = devp;
217 devp->hd_irqdata = 0;
218 devp->hd_flags |= HPET_OPEN;
219 spin_unlock_irq(&hpet_lock);
220 unlock_kernel();
221
222 return 0;
223 }
224
225 static ssize_t
226 hpet_read(struct file *file, char __user *buf, size_t count, loff_t * ppos)
227 {
228 DECLARE_WAITQUEUE(wait, current);
229 unsigned long data;
230 ssize_t retval;
231 struct hpet_dev *devp;
232
233 devp = file->private_data;
234 if (!devp->hd_ireqfreq)
235 return -EIO;
236
237 if (count < sizeof(unsigned long))
238 return -EINVAL;
239
240 add_wait_queue(&devp->hd_waitqueue, &wait);
241
242 for ( ; ; ) {
243 set_current_state(TASK_INTERRUPTIBLE);
244
245 spin_lock_irq(&hpet_lock);
246 data = devp->hd_irqdata;
247 devp->hd_irqdata = 0;
248 spin_unlock_irq(&hpet_lock);
249
250 if (data)
251 break;
252 else if (file->f_flags & O_NONBLOCK) {
253 retval = -EAGAIN;
254 goto out;
255 } else if (signal_pending(current)) {
256 retval = -ERESTARTSYS;
257 goto out;
258 }
259 schedule();
260 }
261
262 retval = put_user(data, (unsigned long __user *)buf);
263 if (!retval)
264 retval = sizeof(unsigned long);
265 out:
266 __set_current_state(TASK_RUNNING);
267 remove_wait_queue(&devp->hd_waitqueue, &wait);
268
269 return retval;
270 }
271
272 static unsigned int hpet_poll(struct file *file, poll_table * wait)
273 {
274 unsigned long v;
275 struct hpet_dev *devp;
276
277 devp = file->private_data;
278
279 if (!devp->hd_ireqfreq)
280 return 0;
281
282 poll_wait(file, &devp->hd_waitqueue, wait);
283
284 spin_lock_irq(&hpet_lock);
285 v = devp->hd_irqdata;
286 spin_unlock_irq(&hpet_lock);
287
288 if (v != 0)
289 return POLLIN | POLLRDNORM;
290
291 return 0;
292 }
293
294 static int hpet_mmap(struct file *file, struct vm_area_struct *vma)
295 {
296 #ifdef CONFIG_HPET_MMAP
297 struct hpet_dev *devp;
298 unsigned long addr;
299
300 if (((vma->vm_end - vma->vm_start) != PAGE_SIZE) || vma->vm_pgoff)
301 return -EINVAL;
302
303 devp = file->private_data;
304 addr = devp->hd_hpets->hp_hpet_phys;
305
306 if (addr & (PAGE_SIZE - 1))
307 return -ENOSYS;
308
309 vma->vm_flags |= VM_IO;
310 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
311
312 if (io_remap_pfn_range(vma, vma->vm_start, addr >> PAGE_SHIFT,
313 PAGE_SIZE, vma->vm_page_prot)) {
314 printk(KERN_ERR "%s: io_remap_pfn_range failed\n",
315 __func__);
316 return -EAGAIN;
317 }
318
319 return 0;
320 #else
321 return -ENOSYS;
322 #endif
323 }
324
325 static int hpet_fasync(int fd, struct file *file, int on)
326 {
327 struct hpet_dev *devp;
328
329 devp = file->private_data;
330
331 if (fasync_helper(fd, file, on, &devp->hd_async_queue) >= 0)
332 return 0;
333 else
334 return -EIO;
335 }
336
337 static int hpet_release(struct inode *inode, struct file *file)
338 {
339 struct hpet_dev *devp;
340 struct hpet_timer __iomem *timer;
341 int irq = 0;
342
343 devp = file->private_data;
344 timer = devp->hd_timer;
345
346 spin_lock_irq(&hpet_lock);
347
348 writeq((readq(&timer->hpet_config) & ~Tn_INT_ENB_CNF_MASK),
349 &timer->hpet_config);
350
351 irq = devp->hd_irq;
352 devp->hd_irq = 0;
353
354 devp->hd_ireqfreq = 0;
355
356 if (devp->hd_flags & HPET_PERIODIC
357 && readq(&timer->hpet_config) & Tn_TYPE_CNF_MASK) {
358 unsigned long v;
359
360 v = readq(&timer->hpet_config);
361 v ^= Tn_TYPE_CNF_MASK;
362 writeq(v, &timer->hpet_config);
363 }
364
365 devp->hd_flags &= ~(HPET_OPEN | HPET_IE | HPET_PERIODIC);
366 spin_unlock_irq(&hpet_lock);
367
368 if (irq)
369 free_irq(irq, devp);
370
371 if (file->f_flags & FASYNC)
372 hpet_fasync(-1, file, 0);
373
374 file->private_data = NULL;
375 return 0;
376 }
377
378 static int hpet_ioctl_common(struct hpet_dev *, int, unsigned long, int);
379
380 static int
381 hpet_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
382 unsigned long arg)
383 {
384 struct hpet_dev *devp;
385
386 devp = file->private_data;
387 return hpet_ioctl_common(devp, cmd, arg, 0);
388 }
389
390 static int hpet_ioctl_ieon(struct hpet_dev *devp)
391 {
392 struct hpet_timer __iomem *timer;
393 struct hpet __iomem *hpet;
394 struct hpets *hpetp;
395 int irq;
396 unsigned long g, v, t, m;
397 unsigned long flags, isr;
398
399 timer = devp->hd_timer;
400 hpet = devp->hd_hpet;
401 hpetp = devp->hd_hpets;
402
403 if (!devp->hd_ireqfreq)
404 return -EIO;
405
406 spin_lock_irq(&hpet_lock);
407
408 if (devp->hd_flags & HPET_IE) {
409 spin_unlock_irq(&hpet_lock);
410 return -EBUSY;
411 }
412
413 devp->hd_flags |= HPET_IE;
414
415 if (readl(&timer->hpet_config) & Tn_INT_TYPE_CNF_MASK)
416 devp->hd_flags |= HPET_SHARED_IRQ;
417 spin_unlock_irq(&hpet_lock);
418
419 irq = devp->hd_hdwirq;
420
421 if (irq) {
422 unsigned long irq_flags;
423
424 sprintf(devp->hd_name, "hpet%d", (int)(devp - hpetp->hp_dev));
425 irq_flags = devp->hd_flags & HPET_SHARED_IRQ
426 ? IRQF_SHARED : IRQF_DISABLED;
427 if (request_irq(irq, hpet_interrupt, irq_flags,
428 devp->hd_name, (void *)devp)) {
429 printk(KERN_ERR "hpet: IRQ %d is not free\n", irq);
430 irq = 0;
431 }
432 }
433
434 if (irq == 0) {
435 spin_lock_irq(&hpet_lock);
436 devp->hd_flags ^= HPET_IE;
437 spin_unlock_irq(&hpet_lock);
438 return -EIO;
439 }
440
441 devp->hd_irq = irq;
442 t = devp->hd_ireqfreq;
443 v = readq(&timer->hpet_config);
444 g = v | Tn_INT_ENB_CNF_MASK;
445
446 if (devp->hd_flags & HPET_PERIODIC) {
447 write_counter(t, &timer->hpet_compare);
448 g |= Tn_TYPE_CNF_MASK;
449 v |= Tn_TYPE_CNF_MASK;
450 writeq(v, &timer->hpet_config);
451 v |= Tn_VAL_SET_CNF_MASK;
452 writeq(v, &timer->hpet_config);
453 local_irq_save(flags);
454 m = read_counter(&hpet->hpet_mc);
455 write_counter(t + m + hpetp->hp_delta, &timer->hpet_compare);
456 } else {
457 local_irq_save(flags);
458 m = read_counter(&hpet->hpet_mc);
459 write_counter(t + m + hpetp->hp_delta, &timer->hpet_compare);
460 }
461
462 if (devp->hd_flags & HPET_SHARED_IRQ) {
463 isr = 1 << (devp - devp->hd_hpets->hp_dev);
464 writel(isr, &hpet->hpet_isr);
465 }
466 writeq(g, &timer->hpet_config);
467 local_irq_restore(flags);
468
469 return 0;
470 }
471
472 /* converts Hz to number of timer ticks */
473 static inline unsigned long hpet_time_div(struct hpets *hpets,
474 unsigned long dis)
475 {
476 unsigned long long m;
477
478 m = hpets->hp_tick_freq + (dis >> 1);
479 do_div(m, dis);
480 return (unsigned long)m;
481 }
482
483 static int
484 hpet_ioctl_common(struct hpet_dev *devp, int cmd, unsigned long arg, int kernel)
485 {
486 struct hpet_timer __iomem *timer;
487 struct hpet __iomem *hpet;
488 struct hpets *hpetp;
489 int err;
490 unsigned long v;
491
492 switch (cmd) {
493 case HPET_IE_OFF:
494 case HPET_INFO:
495 case HPET_EPI:
496 case HPET_DPI:
497 case HPET_IRQFREQ:
498 timer = devp->hd_timer;
499 hpet = devp->hd_hpet;
500 hpetp = devp->hd_hpets;
501 break;
502 case HPET_IE_ON:
503 return hpet_ioctl_ieon(devp);
504 default:
505 return -EINVAL;
506 }
507
508 err = 0;
509
510 switch (cmd) {
511 case HPET_IE_OFF:
512 if ((devp->hd_flags & HPET_IE) == 0)
513 break;
514 v = readq(&timer->hpet_config);
515 v &= ~Tn_INT_ENB_CNF_MASK;
516 writeq(v, &timer->hpet_config);
517 if (devp->hd_irq) {
518 free_irq(devp->hd_irq, devp);
519 devp->hd_irq = 0;
520 }
521 devp->hd_flags ^= HPET_IE;
522 break;
523 case HPET_INFO:
524 {
525 struct hpet_info info;
526
527 if (devp->hd_ireqfreq)
528 info.hi_ireqfreq =
529 hpet_time_div(hpetp, devp->hd_ireqfreq);
530 else
531 info.hi_ireqfreq = 0;
532 info.hi_flags =
533 readq(&timer->hpet_config) & Tn_PER_INT_CAP_MASK;
534 info.hi_hpet = hpetp->hp_which;
535 info.hi_timer = devp - hpetp->hp_dev;
536 if (kernel)
537 memcpy((void *)arg, &info, sizeof(info));
538 else
539 if (copy_to_user((void __user *)arg, &info,
540 sizeof(info)))
541 err = -EFAULT;
542 break;
543 }
544 case HPET_EPI:
545 v = readq(&timer->hpet_config);
546 if ((v & Tn_PER_INT_CAP_MASK) == 0) {
547 err = -ENXIO;
548 break;
549 }
550 devp->hd_flags |= HPET_PERIODIC;
551 break;
552 case HPET_DPI:
553 v = readq(&timer->hpet_config);
554 if ((v & Tn_PER_INT_CAP_MASK) == 0) {
555 err = -ENXIO;
556 break;
557 }
558 if (devp->hd_flags & HPET_PERIODIC &&
559 readq(&timer->hpet_config) & Tn_TYPE_CNF_MASK) {
560 v = readq(&timer->hpet_config);
561 v ^= Tn_TYPE_CNF_MASK;
562 writeq(v, &timer->hpet_config);
563 }
564 devp->hd_flags &= ~HPET_PERIODIC;
565 break;
566 case HPET_IRQFREQ:
567 if (!kernel && (arg > hpet_max_freq) &&
568 !capable(CAP_SYS_RESOURCE)) {
569 err = -EACCES;
570 break;
571 }
572
573 if (!arg) {
574 err = -EINVAL;
575 break;
576 }
577
578 devp->hd_ireqfreq = hpet_time_div(hpetp, arg);
579 }
580
581 return err;
582 }
583
584 static const struct file_operations hpet_fops = {
585 .owner = THIS_MODULE,
586 .llseek = no_llseek,
587 .read = hpet_read,
588 .poll = hpet_poll,
589 .ioctl = hpet_ioctl,
590 .open = hpet_open,
591 .release = hpet_release,
592 .fasync = hpet_fasync,
593 .mmap = hpet_mmap,
594 };
595
596 static int hpet_is_known(struct hpet_data *hdp)
597 {
598 struct hpets *hpetp;
599
600 for (hpetp = hpets; hpetp; hpetp = hpetp->hp_next)
601 if (hpetp->hp_hpet_phys == hdp->hd_phys_address)
602 return 1;
603
604 return 0;
605 }
606
607 static inline int hpet_tpcheck(struct hpet_task *tp)
608 {
609 struct hpet_dev *devp;
610 struct hpets *hpetp;
611
612 devp = tp->ht_opaque;
613
614 if (!devp)
615 return -ENXIO;
616
617 for (hpetp = hpets; hpetp; hpetp = hpetp->hp_next)
618 if (devp >= hpetp->hp_dev
619 && devp < (hpetp->hp_dev + hpetp->hp_ntimer)
620 && devp->hd_hpet == hpetp->hp_hpet)
621 return 0;
622
623 return -ENXIO;
624 }
625
626 #if 0
627 int hpet_unregister(struct hpet_task *tp)
628 {
629 struct hpet_dev *devp;
630 struct hpet_timer __iomem *timer;
631 int err;
632
633 if ((err = hpet_tpcheck(tp)))
634 return err;
635
636 spin_lock_irq(&hpet_task_lock);
637 spin_lock(&hpet_lock);
638
639 devp = tp->ht_opaque;
640 if (devp->hd_task != tp) {
641 spin_unlock(&hpet_lock);
642 spin_unlock_irq(&hpet_task_lock);
643 return -ENXIO;
644 }
645
646 timer = devp->hd_timer;
647 writeq((readq(&timer->hpet_config) & ~Tn_INT_ENB_CNF_MASK),
648 &timer->hpet_config);
649 devp->hd_flags &= ~(HPET_IE | HPET_PERIODIC);
650 devp->hd_task = NULL;
651 spin_unlock(&hpet_lock);
652 spin_unlock_irq(&hpet_task_lock);
653
654 return 0;
655 }
656 #endif /* 0 */
657
658 static ctl_table hpet_table[] = {
659 {
660 .ctl_name = CTL_UNNUMBERED,
661 .procname = "max-user-freq",
662 .data = &hpet_max_freq,
663 .maxlen = sizeof(int),
664 .mode = 0644,
665 .proc_handler = &proc_dointvec,
666 },
667 {.ctl_name = 0}
668 };
669
670 static ctl_table hpet_root[] = {
671 {
672 .ctl_name = CTL_UNNUMBERED,
673 .procname = "hpet",
674 .maxlen = 0,
675 .mode = 0555,
676 .child = hpet_table,
677 },
678 {.ctl_name = 0}
679 };
680
681 static ctl_table dev_root[] = {
682 {
683 .ctl_name = CTL_DEV,
684 .procname = "dev",
685 .maxlen = 0,
686 .mode = 0555,
687 .child = hpet_root,
688 },
689 {.ctl_name = 0}
690 };
691
692 static struct ctl_table_header *sysctl_header;
693
694 /*
695 * Adjustment for when arming the timer with
696 * initial conditions. That is, main counter
697 * ticks expired before interrupts are enabled.
698 */
699 #define TICK_CALIBRATE (1000UL)
700
701 static unsigned long hpet_calibrate(struct hpets *hpetp)
702 {
703 struct hpet_timer __iomem *timer = NULL;
704 unsigned long t, m, count, i, flags, start;
705 struct hpet_dev *devp;
706 int j;
707 struct hpet __iomem *hpet;
708
709 for (j = 0, devp = hpetp->hp_dev; j < hpetp->hp_ntimer; j++, devp++)
710 if ((devp->hd_flags & HPET_OPEN) == 0) {
711 timer = devp->hd_timer;
712 break;
713 }
714
715 if (!timer)
716 return 0;
717
718 hpet = hpetp->hp_hpet;
719 t = read_counter(&timer->hpet_compare);
720
721 i = 0;
722 count = hpet_time_div(hpetp, TICK_CALIBRATE);
723
724 local_irq_save(flags);
725
726 start = read_counter(&hpet->hpet_mc);
727
728 do {
729 m = read_counter(&hpet->hpet_mc);
730 write_counter(t + m + hpetp->hp_delta, &timer->hpet_compare);
731 } while (i++, (m - start) < count);
732
733 local_irq_restore(flags);
734
735 return (m - start) / i;
736 }
737
738 int hpet_alloc(struct hpet_data *hdp)
739 {
740 u64 cap, mcfg;
741 struct hpet_dev *devp;
742 u32 i, ntimer;
743 struct hpets *hpetp;
744 size_t siz;
745 struct hpet __iomem *hpet;
746 static struct hpets *last = NULL;
747 unsigned long period;
748 unsigned long long temp;
749
750 /*
751 * hpet_alloc can be called by platform dependent code.
752 * If platform dependent code has allocated the hpet that
753 * ACPI has also reported, then we catch it here.
754 */
755 if (hpet_is_known(hdp)) {
756 printk(KERN_DEBUG "%s: duplicate HPET ignored\n",
757 __func__);
758 return 0;
759 }
760
761 siz = sizeof(struct hpets) + ((hdp->hd_nirqs - 1) *
762 sizeof(struct hpet_dev));
763
764 hpetp = kzalloc(siz, GFP_KERNEL);
765
766 if (!hpetp)
767 return -ENOMEM;
768
769 hpetp->hp_which = hpet_nhpet++;
770 hpetp->hp_hpet = hdp->hd_address;
771 hpetp->hp_hpet_phys = hdp->hd_phys_address;
772
773 hpetp->hp_ntimer = hdp->hd_nirqs;
774
775 for (i = 0; i < hdp->hd_nirqs; i++)
776 hpetp->hp_dev[i].hd_hdwirq = hdp->hd_irq[i];
777
778 hpet = hpetp->hp_hpet;
779
780 cap = readq(&hpet->hpet_cap);
781
782 ntimer = ((cap & HPET_NUM_TIM_CAP_MASK) >> HPET_NUM_TIM_CAP_SHIFT) + 1;
783
784 if (hpetp->hp_ntimer != ntimer) {
785 printk(KERN_WARNING "hpet: number irqs doesn't agree"
786 " with number of timers\n");
787 kfree(hpetp);
788 return -ENODEV;
789 }
790
791 if (last)
792 last->hp_next = hpetp;
793 else
794 hpets = hpetp;
795
796 last = hpetp;
797
798 period = (cap & HPET_COUNTER_CLK_PERIOD_MASK) >>
799 HPET_COUNTER_CLK_PERIOD_SHIFT; /* fs, 10^-15 */
800 temp = 1000000000000000uLL; /* 10^15 femtoseconds per second */
801 temp += period >> 1; /* round */
802 do_div(temp, period);
803 hpetp->hp_tick_freq = temp; /* ticks per second */
804
805 printk(KERN_INFO "hpet%d: at MMIO 0x%lx, IRQ%s",
806 hpetp->hp_which, hdp->hd_phys_address,
807 hpetp->hp_ntimer > 1 ? "s" : "");
808 for (i = 0; i < hpetp->hp_ntimer; i++)
809 printk("%s %d", i > 0 ? "," : "", hdp->hd_irq[i]);
810 printk("\n");
811
812 printk(KERN_INFO "hpet%u: %u %d-bit timers, %Lu Hz\n",
813 hpetp->hp_which, hpetp->hp_ntimer,
814 cap & HPET_COUNTER_SIZE_MASK ? 64 : 32, hpetp->hp_tick_freq);
815
816 mcfg = readq(&hpet->hpet_config);
817 if ((mcfg & HPET_ENABLE_CNF_MASK) == 0) {
818 write_counter(0L, &hpet->hpet_mc);
819 mcfg |= HPET_ENABLE_CNF_MASK;
820 writeq(mcfg, &hpet->hpet_config);
821 }
822
823 for (i = 0, devp = hpetp->hp_dev; i < hpetp->hp_ntimer; i++, devp++) {
824 struct hpet_timer __iomem *timer;
825
826 timer = &hpet->hpet_timers[devp - hpetp->hp_dev];
827
828 devp->hd_hpets = hpetp;
829 devp->hd_hpet = hpet;
830 devp->hd_timer = timer;
831
832 /*
833 * If the timer was reserved by platform code,
834 * then make timer unavailable for opens.
835 */
836 if (hdp->hd_state & (1 << i)) {
837 devp->hd_flags = HPET_OPEN;
838 continue;
839 }
840
841 init_waitqueue_head(&devp->hd_waitqueue);
842 }
843
844 hpetp->hp_delta = hpet_calibrate(hpetp);
845
846 /* This clocksource driver currently only works on ia64 */
847 #ifdef CONFIG_IA64
848 if (!hpet_clocksource) {
849 hpet_mctr = (void __iomem *)&hpetp->hp_hpet->hpet_mc;
850 CLKSRC_FSYS_MMIO_SET(clocksource_hpet.fsys_mmio, hpet_mctr);
851 clocksource_hpet.mult = clocksource_hz2mult(hpetp->hp_tick_freq,
852 clocksource_hpet.shift);
853 clocksource_register(&clocksource_hpet);
854 hpetp->hp_clocksource = &clocksource_hpet;
855 hpet_clocksource = &clocksource_hpet;
856 }
857 #endif
858
859 return 0;
860 }
861
862 static acpi_status hpet_resources(struct acpi_resource *res, void *data)
863 {
864 struct hpet_data *hdp;
865 acpi_status status;
866 struct acpi_resource_address64 addr;
867
868 hdp = data;
869
870 status = acpi_resource_to_address64(res, &addr);
871
872 if (ACPI_SUCCESS(status)) {
873 hdp->hd_phys_address = addr.minimum;
874 hdp->hd_address = ioremap(addr.minimum, addr.address_length);
875
876 if (hpet_is_known(hdp)) {
877 printk(KERN_DEBUG "%s: 0x%lx is busy\n",
878 __func__, hdp->hd_phys_address);
879 iounmap(hdp->hd_address);
880 return AE_ALREADY_EXISTS;
881 }
882 } else if (res->type == ACPI_RESOURCE_TYPE_FIXED_MEMORY32) {
883 struct acpi_resource_fixed_memory32 *fixmem32;
884
885 fixmem32 = &res->data.fixed_memory32;
886 if (!fixmem32)
887 return AE_NO_MEMORY;
888
889 hdp->hd_phys_address = fixmem32->address;
890 hdp->hd_address = ioremap(fixmem32->address,
891 HPET_RANGE_SIZE);
892
893 if (hpet_is_known(hdp)) {
894 printk(KERN_DEBUG "%s: 0x%lx is busy\n",
895 __func__, hdp->hd_phys_address);
896 iounmap(hdp->hd_address);
897 return AE_ALREADY_EXISTS;
898 }
899 } else if (res->type == ACPI_RESOURCE_TYPE_EXTENDED_IRQ) {
900 struct acpi_resource_extended_irq *irqp;
901 int i, irq;
902
903 irqp = &res->data.extended_irq;
904
905 for (i = 0; i < irqp->interrupt_count; i++) {
906 irq = acpi_register_gsi(irqp->interrupts[i],
907 irqp->triggering, irqp->polarity);
908 if (irq < 0)
909 return AE_ERROR;
910
911 hdp->hd_irq[hdp->hd_nirqs] = irq;
912 hdp->hd_nirqs++;
913 }
914 }
915
916 return AE_OK;
917 }
918
919 static int hpet_acpi_add(struct acpi_device *device)
920 {
921 acpi_status result;
922 struct hpet_data data;
923
924 memset(&data, 0, sizeof(data));
925
926 result =
927 acpi_walk_resources(device->handle, METHOD_NAME__CRS,
928 hpet_resources, &data);
929
930 if (ACPI_FAILURE(result))
931 return -ENODEV;
932
933 if (!data.hd_address || !data.hd_nirqs) {
934 printk("%s: no address or irqs in _CRS\n", __func__);
935 return -ENODEV;
936 }
937
938 return hpet_alloc(&data);
939 }
940
941 static int hpet_acpi_remove(struct acpi_device *device, int type)
942 {
943 /* XXX need to unregister clocksource, dealloc mem, etc */
944 return -EINVAL;
945 }
946
947 static const struct acpi_device_id hpet_device_ids[] = {
948 {"PNP0103", 0},
949 {"", 0},
950 };
951 MODULE_DEVICE_TABLE(acpi, hpet_device_ids);
952
953 static struct acpi_driver hpet_acpi_driver = {
954 .name = "hpet",
955 .ids = hpet_device_ids,
956 .ops = {
957 .add = hpet_acpi_add,
958 .remove = hpet_acpi_remove,
959 },
960 };
961
962 static struct miscdevice hpet_misc = { HPET_MINOR, "hpet", &hpet_fops };
963
964 static int __init hpet_init(void)
965 {
966 int result;
967
968 result = misc_register(&hpet_misc);
969 if (result < 0)
970 return -ENODEV;
971
972 sysctl_header = register_sysctl_table(dev_root);
973
974 result = acpi_bus_register_driver(&hpet_acpi_driver);
975 if (result < 0) {
976 if (sysctl_header)
977 unregister_sysctl_table(sysctl_header);
978 misc_deregister(&hpet_misc);
979 return result;
980 }
981
982 return 0;
983 }
984
985 static void __exit hpet_exit(void)
986 {
987 acpi_bus_unregister_driver(&hpet_acpi_driver);
988
989 if (sysctl_header)
990 unregister_sysctl_table(sysctl_header);
991 misc_deregister(&hpet_misc);
992
993 return;
994 }
995
996 module_init(hpet_init);
997 module_exit(hpet_exit);
998 MODULE_AUTHOR("Bob Picco <Robert.Picco@hp.com>");
999 MODULE_LICENSE("GPL");
SocketAccessConTroL development