1
2
3
4
5
6
7
8
9
10
11
12
13
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>
24#include <linux/mm.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#include <linux/compat.h>
33#include <linux/clocksource.h>
34#include <linux/uaccess.h>
35#include <linux/slab.h>
36#include <linux/io.h>
37
38#include <asm/current.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
48
49
50
51#define HPET_USER_FREQ (64)
52#define HPET_DRIFT (500)
53
54#define HPET_RANGE_SIZE 1024
55
56
57
58
59
60
61#if BITS_PER_LONG == 64
62#define write_counter(V, MC) writeq(V, MC)
63#define read_counter(MC) readq(MC)
64#else
65#define write_counter(V, MC) writel(V, MC)
66#define read_counter(MC) readl(MC)
67#endif
68
69static DEFINE_MUTEX(hpet_mutex);
70static u32 hpet_nhpet, hpet_max_freq = HPET_USER_FREQ;
71
72
73#ifdef CONFIG_IA64
74static void __iomem *hpet_mctr;
75
76static cycle_t read_hpet(struct clocksource *cs)
77{
78 return (cycle_t)read_counter((void __iomem *)hpet_mctr);
79}
80
81static struct clocksource clocksource_hpet = {
82 .name = "hpet",
83 .rating = 250,
84 .read = read_hpet,
85 .mask = CLOCKSOURCE_MASK(64),
86 .flags = CLOCK_SOURCE_IS_CONTINUOUS,
87};
88static struct clocksource *hpet_clocksource;
89#endif
90
91
92static DEFINE_SPINLOCK(hpet_lock);
93
94#define HPET_DEV_NAME (7)
95
96struct hpet_dev {
97 struct hpets *hd_hpets;
98 struct hpet __iomem *hd_hpet;
99 struct hpet_timer __iomem *hd_timer;
100 unsigned long hd_ireqfreq;
101 unsigned long hd_irqdata;
102 wait_queue_head_t hd_waitqueue;
103 struct fasync_struct *hd_async_queue;
104 unsigned int hd_flags;
105 unsigned int hd_irq;
106 unsigned int hd_hdwirq;
107 char hd_name[HPET_DEV_NAME];
108};
109
110struct hpets {
111 struct hpets *hp_next;
112 struct hpet __iomem *hp_hpet;
113 unsigned long hp_hpet_phys;
114 struct clocksource *hp_clocksource;
115 unsigned long long hp_tick_freq;
116 unsigned long hp_delta;
117 unsigned int hp_ntimer;
118 unsigned int hp_which;
119 struct hpet_dev hp_dev[1];
120};
121
122static struct hpets *hpets;
123
124#define HPET_OPEN 0x0001
125#define HPET_IE 0x0002
126#define HPET_PERIODIC 0x0004
127#define HPET_SHARED_IRQ 0x0008
128
129
130#ifndef readq
131static inline unsigned long long readq(void __iomem *addr)
132{
133 return readl(addr) | (((unsigned long long)readl(addr + 4)) << 32LL);
134}
135#endif
136
137#ifndef writeq
138static inline void writeq(unsigned long long v, void __iomem *addr)
139{
140 writel(v & 0xffffffff, addr);
141 writel(v >> 32, addr + 4);
142}
143#endif
144
145static irqreturn_t hpet_interrupt(int irq, void *data)
146{
147 struct hpet_dev *devp;
148 unsigned long isr;
149
150 devp = data;
151 isr = 1 << (devp - devp->hd_hpets->hp_dev);
152
153 if ((devp->hd_flags & HPET_SHARED_IRQ) &&
154 !(isr & readl(&devp->hd_hpet->hpet_isr)))
155 return IRQ_NONE;
156
157 spin_lock(&hpet_lock);
158 devp->hd_irqdata++;
159
160
161
162
163
164 if ((devp->hd_flags & (HPET_IE | HPET_PERIODIC)) == HPET_IE) {
165 unsigned long m, t, mc, base, k;
166 struct hpet __iomem *hpet = devp->hd_hpet;
167 struct hpets *hpetp = devp->hd_hpets;
168
169 t = devp->hd_ireqfreq;
170 m = read_counter(&devp->hd_timer->hpet_compare);
171 mc = read_counter(&hpet->hpet_mc);
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187 base = mc % t;
188 k = (mc - base + hpetp->hp_delta) / t;
189 write_counter(t * (k + 1) + base,
190 &devp->hd_timer->hpet_compare);
191 }
192
193 if (devp->hd_flags & HPET_SHARED_IRQ)
194 writel(isr, &devp->hd_hpet->hpet_isr);
195 spin_unlock(&hpet_lock);
196
197 wake_up_interruptible(&devp->hd_waitqueue);
198
199 kill_fasync(&devp->hd_async_queue, SIGIO, POLL_IN);
200
201 return IRQ_HANDLED;
202}
203
204static void hpet_timer_set_irq(struct hpet_dev *devp)
205{
206 unsigned long v;
207 int irq, gsi;
208 struct hpet_timer __iomem *timer;
209
210 spin_lock_irq(&hpet_lock);
211 if (devp->hd_hdwirq) {
212 spin_unlock_irq(&hpet_lock);
213 return;
214 }
215
216 timer = devp->hd_timer;
217
218
219 v = readl(&timer->hpet_config);
220 if (!(v & Tn_INT_TYPE_CNF_MASK)) {
221 v |= Tn_INT_TYPE_CNF_MASK;
222 writel(v, &timer->hpet_config);
223 }
224 spin_unlock_irq(&hpet_lock);
225
226 v = (readq(&timer->hpet_config) & Tn_INT_ROUTE_CAP_MASK) >>
227 Tn_INT_ROUTE_CAP_SHIFT;
228
229
230
231
232
233 if (acpi_irq_model == ACPI_IRQ_MODEL_PIC)
234 v &= ~0xf3df;
235 else
236 v &= ~0xffff;
237
238 for_each_set_bit(irq, &v, HPET_MAX_IRQ) {
239 if (irq >= nr_irqs) {
240 irq = HPET_MAX_IRQ;
241 break;
242 }
243
244 gsi = acpi_register_gsi(NULL, irq, ACPI_LEVEL_SENSITIVE,
245 ACPI_ACTIVE_LOW);
246 if (gsi > 0)
247 break;
248
249
250 }
251
252 if (irq < HPET_MAX_IRQ) {
253 spin_lock_irq(&hpet_lock);
254 v = readl(&timer->hpet_config);
255 v |= irq << Tn_INT_ROUTE_CNF_SHIFT;
256 writel(v, &timer->hpet_config);
257 devp->hd_hdwirq = gsi;
258 spin_unlock_irq(&hpet_lock);
259 }
260 return;
261}
262
263static int hpet_open(struct inode *inode, struct file *file)
264{
265 struct hpet_dev *devp;
266 struct hpets *hpetp;
267 int i;
268
269 if (file->f_mode & FMODE_WRITE)
270 return -EINVAL;
271
272 mutex_lock(&hpet_mutex);
273 spin_lock_irq(&hpet_lock);
274
275 for (devp = NULL, hpetp = hpets; hpetp && !devp; hpetp = hpetp->hp_next)
276 for (i = 0; i < hpetp->hp_ntimer; i++)
277 if (hpetp->hp_dev[i].hd_flags & HPET_OPEN)
278 continue;
279 else {
280 devp = &hpetp->hp_dev[i];
281 break;
282 }
283
284 if (!devp) {
285 spin_unlock_irq(&hpet_lock);
286 mutex_unlock(&hpet_mutex);
287 return -EBUSY;
288 }
289
290 file->private_data = devp;
291 devp->hd_irqdata = 0;
292 devp->hd_flags |= HPET_OPEN;
293 spin_unlock_irq(&hpet_lock);
294 mutex_unlock(&hpet_mutex);
295
296 hpet_timer_set_irq(devp);
297
298 return 0;
299}
300
301static ssize_t
302hpet_read(struct file *file, char __user *buf, size_t count, loff_t * ppos)
303{
304 DECLARE_WAITQUEUE(wait, current);
305 unsigned long data;
306 ssize_t retval;
307 struct hpet_dev *devp;
308
309 devp = file->private_data;
310 if (!devp->hd_ireqfreq)
311 return -EIO;
312
313 if (count < sizeof(unsigned long))
314 return -EINVAL;
315
316 add_wait_queue(&devp->hd_waitqueue, &wait);
317
318 for ( ; ; ) {
319 set_current_state(TASK_INTERRUPTIBLE);
320
321 spin_lock_irq(&hpet_lock);
322 data = devp->hd_irqdata;
323 devp->hd_irqdata = 0;
324 spin_unlock_irq(&hpet_lock);
325
326 if (data)
327 break;
328 else if (file->f_flags & O_NONBLOCK) {
329 retval = -EAGAIN;
330 goto out;
331 } else if (signal_pending(current)) {
332 retval = -ERESTARTSYS;
333 goto out;
334 }
335 schedule();
336 }
337
338 retval = put_user(data, (unsigned long __user *)buf);
339 if (!retval)
340 retval = sizeof(unsigned long);
341out:
342 __set_current_state(TASK_RUNNING);
343 remove_wait_queue(&devp->hd_waitqueue, &wait);
344
345 return retval;
346}
347
348static unsigned int hpet_poll(struct file *file, poll_table * wait)
349{
350 unsigned long v;
351 struct hpet_dev *devp;
352
353 devp = file->private_data;
354
355 if (!devp->hd_ireqfreq)
356 return 0;
357
358 poll_wait(file, &devp->hd_waitqueue, wait);
359
360 spin_lock_irq(&hpet_lock);
361 v = devp->hd_irqdata;
362 spin_unlock_irq(&hpet_lock);
363
364 if (v != 0)
365 return POLLIN | POLLRDNORM;
366
367 return 0;
368}
369
370#ifdef CONFIG_HPET_MMAP
371#ifdef CONFIG_HPET_MMAP_DEFAULT
372static int hpet_mmap_enabled = 1;
373#else
374static int hpet_mmap_enabled = 0;
375#endif
376
377static __init int hpet_mmap_enable(char *str)
378{
379 get_option(&str, &hpet_mmap_enabled);
380 pr_info(KERN_INFO "HPET MMAP %s\n",
381 hpet_mmap_enabled ? "disabled" : "enabled");
382 return 1;
383}
384__setup("hpet_mmap", hpet_mmap_enable);
385
386static int hpet_mmap(struct file *file, struct vm_area_struct *vma)
387{
388 struct hpet_dev *devp;
389 unsigned long addr;
390
391 if (!hpet_mmap_enabled)
392 return -EACCES;
393
394 devp = file->private_data;
395 addr = devp->hd_hpets->hp_hpet_phys;
396
397 if (addr & (PAGE_SIZE - 1))
398 return -ENOSYS;
399
400 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
401 return vm_iomap_memory(vma, addr, PAGE_SIZE);
402}
403#else
404static int hpet_mmap(struct file *file, struct vm_area_struct *vma)
405{
406 return -ENOSYS;
407}
408#endif
409
410static int hpet_fasync(int fd, struct file *file, int on)
411{
412 struct hpet_dev *devp;
413
414 devp = file->private_data;
415
416 if (fasync_helper(fd, file, on, &devp->hd_async_queue) >= 0)
417 return 0;
418 else
419 return -EIO;
420}
421
422static int hpet_release(struct inode *inode, struct file *file)
423{
424 struct hpet_dev *devp;
425 struct hpet_timer __iomem *timer;
426 int irq = 0;
427
428 devp = file->private_data;
429 timer = devp->hd_timer;
430
431 spin_lock_irq(&hpet_lock);
432
433 writeq((readq(&timer->hpet_config) & ~Tn_INT_ENB_CNF_MASK),
434 &timer->hpet_config);
435
436 irq = devp->hd_irq;
437 devp->hd_irq = 0;
438
439 devp->hd_ireqfreq = 0;
440
441 if (devp->hd_flags & HPET_PERIODIC
442 && readq(&timer->hpet_config) & Tn_TYPE_CNF_MASK) {
443 unsigned long v;
444
445 v = readq(&timer->hpet_config);
446 v ^= Tn_TYPE_CNF_MASK;
447 writeq(v, &timer->hpet_config);
448 }
449
450 devp->hd_flags &= ~(HPET_OPEN | HPET_IE | HPET_PERIODIC);
451 spin_unlock_irq(&hpet_lock);
452
453 if (irq)
454 free_irq(irq, devp);
455
456 file->private_data = NULL;
457 return 0;
458}
459
460static int hpet_ioctl_ieon(struct hpet_dev *devp)
461{
462 struct hpet_timer __iomem *timer;
463 struct hpet __iomem *hpet;
464 struct hpets *hpetp;
465 int irq;
466 unsigned long g, v, t, m;
467 unsigned long flags, isr;
468
469 timer = devp->hd_timer;
470 hpet = devp->hd_hpet;
471 hpetp = devp->hd_hpets;
472
473 if (!devp->hd_ireqfreq)
474 return -EIO;
475
476 spin_lock_irq(&hpet_lock);
477
478 if (devp->hd_flags & HPET_IE) {
479 spin_unlock_irq(&hpet_lock);
480 return -EBUSY;
481 }
482
483 devp->hd_flags |= HPET_IE;
484
485 if (readl(&timer->hpet_config) & Tn_INT_TYPE_CNF_MASK)
486 devp->hd_flags |= HPET_SHARED_IRQ;
487 spin_unlock_irq(&hpet_lock);
488
489 irq = devp->hd_hdwirq;
490
491 if (irq) {
492 unsigned long irq_flags;
493
494 if (devp->hd_flags & HPET_SHARED_IRQ) {
495
496
497
498
499
500 writel(readl(&timer->hpet_config) & ~Tn_TYPE_CNF_MASK,
501 &timer->hpet_config);
502 write_counter(read_counter(&hpet->hpet_mc),
503 &timer->hpet_compare);
504
505 isr = 1 << (devp - devp->hd_hpets->hp_dev);
506 writel(isr, &hpet->hpet_isr);
507 }
508
509 sprintf(devp->hd_name, "hpet%d", (int)(devp - hpetp->hp_dev));
510 irq_flags = devp->hd_flags & HPET_SHARED_IRQ
511 ? IRQF_SHARED : IRQF_DISABLED;
512 if (request_irq(irq, hpet_interrupt, irq_flags,
513 devp->hd_name, (void *)devp)) {
514 printk(KERN_ERR "hpet: IRQ %d is not free\n", irq);
515 irq = 0;
516 }
517 }
518
519 if (irq == 0) {
520 spin_lock_irq(&hpet_lock);
521 devp->hd_flags ^= HPET_IE;
522 spin_unlock_irq(&hpet_lock);
523 return -EIO;
524 }
525
526 devp->hd_irq = irq;
527 t = devp->hd_ireqfreq;
528 v = readq(&timer->hpet_config);
529
530
531
532
533 g = v | Tn_32MODE_CNF_MASK | Tn_INT_ENB_CNF_MASK;
534
535 if (devp->hd_flags & HPET_PERIODIC) {
536 g |= Tn_TYPE_CNF_MASK;
537 v |= Tn_TYPE_CNF_MASK | Tn_VAL_SET_CNF_MASK;
538 writeq(v, &timer->hpet_config);
539 local_irq_save(flags);
540
541
542
543
544
545
546
547
548 m = read_counter(&hpet->hpet_mc);
549 write_counter(t + m + hpetp->hp_delta, &timer->hpet_compare);
550
551
552
553
554 write_counter(t, &timer->hpet_compare);
555 } else {
556 local_irq_save(flags);
557 m = read_counter(&hpet->hpet_mc);
558 write_counter(t + m + hpetp->hp_delta, &timer->hpet_compare);
559 }
560
561 if (devp->hd_flags & HPET_SHARED_IRQ) {
562 isr = 1 << (devp - devp->hd_hpets->hp_dev);
563 writel(isr, &hpet->hpet_isr);
564 }
565 writeq(g, &timer->hpet_config);
566 local_irq_restore(flags);
567
568 return 0;
569}
570
571
572static inline unsigned long hpet_time_div(struct hpets *hpets,
573 unsigned long dis)
574{
575 unsigned long long m;
576
577 m = hpets->hp_tick_freq + (dis >> 1);
578 do_div(m, dis);
579 return (unsigned long)m;
580}
581
582static int
583hpet_ioctl_common(struct hpet_dev *devp, int cmd, unsigned long arg,
584 struct hpet_info *info)
585{
586 struct hpet_timer __iomem *timer;
587 struct hpet __iomem *hpet;
588 struct hpets *hpetp;
589 int err;
590 unsigned long v;
591
592 switch (cmd) {
593 case HPET_IE_OFF:
594 case HPET_INFO:
595 case HPET_EPI:
596 case HPET_DPI:
597 case HPET_IRQFREQ:
598 timer = devp->hd_timer;
599 hpet = devp->hd_hpet;
600 hpetp = devp->hd_hpets;
601 break;
602 case HPET_IE_ON:
603 return hpet_ioctl_ieon(devp);
604 default:
605 return -EINVAL;
606 }
607
608 err = 0;
609
610 switch (cmd) {
611 case HPET_IE_OFF:
612 if ((devp->hd_flags & HPET_IE) == 0)
613 break;
614 v = readq(&timer->hpet_config);
615 v &= ~Tn_INT_ENB_CNF_MASK;
616 writeq(v, &timer->hpet_config);
617 if (devp->hd_irq) {
618 free_irq(devp->hd_irq, devp);
619 devp->hd_irq = 0;
620 }
621 devp->hd_flags ^= HPET_IE;
622 break;
623 case HPET_INFO:
624 {
625 memset(info, 0, sizeof(*info));
626 if (devp->hd_ireqfreq)
627 info->hi_ireqfreq =
628 hpet_time_div(hpetp, devp->hd_ireqfreq);
629 info->hi_flags =
630 readq(&timer->hpet_config) & Tn_PER_INT_CAP_MASK;
631 info->hi_hpet = hpetp->hp_which;
632 info->hi_timer = devp - hpetp->hp_dev;
633 break;
634 }
635 case HPET_EPI:
636 v = readq(&timer->hpet_config);
637 if ((v & Tn_PER_INT_CAP_MASK) == 0) {
638 err = -ENXIO;
639 break;
640 }
641 devp->hd_flags |= HPET_PERIODIC;
642 break;
643 case HPET_DPI:
644 v = readq(&timer->hpet_config);
645 if ((v & Tn_PER_INT_CAP_MASK) == 0) {
646 err = -ENXIO;
647 break;
648 }
649 if (devp->hd_flags & HPET_PERIODIC &&
650 readq(&timer->hpet_config) & Tn_TYPE_CNF_MASK) {
651 v = readq(&timer->hpet_config);
652 v ^= Tn_TYPE_CNF_MASK;
653 writeq(v, &timer->hpet_config);
654 }
655 devp->hd_flags &= ~HPET_PERIODIC;
656 break;
657 case HPET_IRQFREQ:
658 if ((arg > hpet_max_freq) &&
659 !capable(CAP_SYS_RESOURCE)) {
660 err = -EACCES;
661 break;
662 }
663
664 if (!arg) {
665 err = -EINVAL;
666 break;
667 }
668
669 devp->hd_ireqfreq = hpet_time_div(hpetp, arg);
670 }
671
672 return err;
673}
674
675static long
676hpet_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
677{
678 struct hpet_info info;
679 int err;
680
681 mutex_lock(&hpet_mutex);
682 err = hpet_ioctl_common(file->private_data, cmd, arg, &info);
683 mutex_unlock(&hpet_mutex);
684
685 if ((cmd == HPET_INFO) && !err &&
686 (copy_to_user((void __user *)arg, &info, sizeof(info))))
687 err = -EFAULT;
688
689 return err;
690}
691
692#ifdef CONFIG_COMPAT
693struct compat_hpet_info {
694 compat_ulong_t hi_ireqfreq;
695 compat_ulong_t hi_flags;
696 unsigned short hi_hpet;
697 unsigned short hi_timer;
698};
699
700static long
701hpet_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
702{
703 struct hpet_info info;
704 int err;
705
706 mutex_lock(&hpet_mutex);
707 err = hpet_ioctl_common(file->private_data, cmd, arg, &info);
708 mutex_unlock(&hpet_mutex);
709
710 if ((cmd == HPET_INFO) && !err) {
711 struct compat_hpet_info __user *u = compat_ptr(arg);
712 if (put_user(info.hi_ireqfreq, &u->hi_ireqfreq) ||
713 put_user(info.hi_flags, &u->hi_flags) ||
714 put_user(info.hi_hpet, &u->hi_hpet) ||
715 put_user(info.hi_timer, &u->hi_timer))
716 err = -EFAULT;
717 }
718
719 return err;
720}
721#endif
722
723static const struct file_operations hpet_fops = {
724 .owner = THIS_MODULE,
725 .llseek = no_llseek,
726 .read = hpet_read,
727 .poll = hpet_poll,
728 .unlocked_ioctl = hpet_ioctl,
729#ifdef CONFIG_COMPAT
730 .compat_ioctl = hpet_compat_ioctl,
731#endif
732 .open = hpet_open,
733 .release = hpet_release,
734 .fasync = hpet_fasync,
735 .mmap = hpet_mmap,
736};
737
738static int hpet_is_known(struct hpet_data *hdp)
739{
740 struct hpets *hpetp;
741
742 for (hpetp = hpets; hpetp; hpetp = hpetp->hp_next)
743 if (hpetp->hp_hpet_phys == hdp->hd_phys_address)
744 return 1;
745
746 return 0;
747}
748
749static ctl_table hpet_table[] = {
750 {
751 .procname = "max-user-freq",
752 .data = &hpet_max_freq,
753 .maxlen = sizeof(int),
754 .mode = 0644,
755 .proc_handler = proc_dointvec,
756 },
757 {}
758};
759
760static ctl_table hpet_root[] = {
761 {
762 .procname = "hpet",
763 .maxlen = 0,
764 .mode = 0555,
765 .child = hpet_table,
766 },
767 {}
768};
769
770static ctl_table dev_root[] = {
771 {
772 .procname = "dev",
773 .maxlen = 0,
774 .mode = 0555,
775 .child = hpet_root,
776 },
777 {}
778};
779
780static struct ctl_table_header *sysctl_header;
781
782
783
784
785
786
787#define TICK_CALIBRATE (1000UL)
788
789static unsigned long __hpet_calibrate(struct hpets *hpetp)
790{
791 struct hpet_timer __iomem *timer = NULL;
792 unsigned long t, m, count, i, flags, start;
793 struct hpet_dev *devp;
794 int j;
795 struct hpet __iomem *hpet;
796
797 for (j = 0, devp = hpetp->hp_dev; j < hpetp->hp_ntimer; j++, devp++)
798 if ((devp->hd_flags & HPET_OPEN) == 0) {
799 timer = devp->hd_timer;
800 break;
801 }
802
803 if (!timer)
804 return 0;
805
806 hpet = hpetp->hp_hpet;
807 t = read_counter(&timer->hpet_compare);
808
809 i = 0;
810 count = hpet_time_div(hpetp, TICK_CALIBRATE);
811
812 local_irq_save(flags);
813
814 start = read_counter(&hpet->hpet_mc);
815
816 do {
817 m = read_counter(&hpet->hpet_mc);
818 write_counter(t + m + hpetp->hp_delta, &timer->hpet_compare);
819 } while (i++, (m - start) < count);
820
821 local_irq_restore(flags);
822
823 return (m - start) / i;
824}
825
826static unsigned long hpet_calibrate(struct hpets *hpetp)
827{
828 unsigned long ret = ~0UL;
829 unsigned long tmp;
830
831
832
833
834
835
836 for ( ; ; ) {
837 tmp = __hpet_calibrate(hpetp);
838 if (ret <= tmp)
839 break;
840 ret = tmp;
841 }
842
843 return ret;
844}
845
846int hpet_alloc(struct hpet_data *hdp)
847{
848 u64 cap, mcfg;
849 struct hpet_dev *devp;
850 u32 i, ntimer;
851 struct hpets *hpetp;
852 size_t siz;
853 struct hpet __iomem *hpet;
854 static struct hpets *last;
855 unsigned long period;
856 unsigned long long temp;
857 u32 remainder;
858
859
860
861
862
863
864 if (hpet_is_known(hdp)) {
865 printk(KERN_DEBUG "%s: duplicate HPET ignored\n",
866 __func__);
867 return 0;
868 }
869
870 siz = sizeof(struct hpets) + ((hdp->hd_nirqs - 1) *
871 sizeof(struct hpet_dev));
872
873 hpetp = kzalloc(siz, GFP_KERNEL);
874
875 if (!hpetp)
876 return -ENOMEM;
877
878 hpetp->hp_which = hpet_nhpet++;
879 hpetp->hp_hpet = hdp->hd_address;
880 hpetp->hp_hpet_phys = hdp->hd_phys_address;
881
882 hpetp->hp_ntimer = hdp->hd_nirqs;
883
884 for (i = 0; i < hdp->hd_nirqs; i++)
885 hpetp->hp_dev[i].hd_hdwirq = hdp->hd_irq[i];
886
887 hpet = hpetp->hp_hpet;
888
889 cap = readq(&hpet->hpet_cap);
890
891 ntimer = ((cap & HPET_NUM_TIM_CAP_MASK) >> HPET_NUM_TIM_CAP_SHIFT) + 1;
892
893 if (hpetp->hp_ntimer != ntimer) {
894 printk(KERN_WARNING "hpet: number irqs doesn't agree"
895 " with number of timers\n");
896 kfree(hpetp);
897 return -ENODEV;
898 }
899
900 if (last)
901 last->hp_next = hpetp;
902 else
903 hpets = hpetp;
904
905 last = hpetp;
906
907 period = (cap & HPET_COUNTER_CLK_PERIOD_MASK) >>
908 HPET_COUNTER_CLK_PERIOD_SHIFT;
909 temp = 1000000000000000uLL;
910 temp += period >> 1;
911 do_div(temp, period);
912 hpetp->hp_tick_freq = temp;
913
914 printk(KERN_INFO "hpet%d: at MMIO 0x%lx, IRQ%s",
915 hpetp->hp_which, hdp->hd_phys_address,
916 hpetp->hp_ntimer > 1 ? "s" : "");
917 for (i = 0; i < hpetp->hp_ntimer; i++)
918 printk(KERN_CONT "%s %d", i > 0 ? "," : "", hdp->hd_irq[i]);
919 printk(KERN_CONT "\n");
920
921 temp = hpetp->hp_tick_freq;
922 remainder = do_div(temp, 1000000);
923 printk(KERN_INFO
924 "hpet%u: %u comparators, %d-bit %u.%06u MHz counter\n",
925 hpetp->hp_which, hpetp->hp_ntimer,
926 cap & HPET_COUNTER_SIZE_MASK ? 64 : 32,
927 (unsigned) temp, remainder);
928
929 mcfg = readq(&hpet->hpet_config);
930 if ((mcfg & HPET_ENABLE_CNF_MASK) == 0) {
931 write_counter(0L, &hpet->hpet_mc);
932 mcfg |= HPET_ENABLE_CNF_MASK;
933 writeq(mcfg, &hpet->hpet_config);
934 }
935
936 for (i = 0, devp = hpetp->hp_dev; i < hpetp->hp_ntimer; i++, devp++) {
937 struct hpet_timer __iomem *timer;
938
939 timer = &hpet->hpet_timers[devp - hpetp->hp_dev];
940
941 devp->hd_hpets = hpetp;
942 devp->hd_hpet = hpet;
943 devp->hd_timer = timer;
944
945
946
947
948
949 if (hdp->hd_state & (1 << i)) {
950 devp->hd_flags = HPET_OPEN;
951 continue;
952 }
953
954 init_waitqueue_head(&devp->hd_waitqueue);
955 }
956
957 hpetp->hp_delta = hpet_calibrate(hpetp);
958
959
960#ifdef CONFIG_IA64
961 if (!hpet_clocksource) {
962 hpet_mctr = (void __iomem *)&hpetp->hp_hpet->hpet_mc;
963 clocksource_hpet.archdata.fsys_mmio = hpet_mctr;
964 clocksource_register_hz(&clocksource_hpet, hpetp->hp_tick_freq);
965 hpetp->hp_clocksource = &clocksource_hpet;
966 hpet_clocksource = &clocksource_hpet;
967 }
968#endif
969
970 return 0;
971}
972
973static acpi_status hpet_resources(struct acpi_resource *res, void *data)
974{
975 struct hpet_data *hdp;
976 acpi_status status;
977 struct acpi_resource_address64 addr;
978
979 hdp = data;
980
981 status = acpi_resource_to_address64(res, &addr);
982
983 if (ACPI_SUCCESS(status)) {
984 hdp->hd_phys_address = addr.address.minimum;
985 hdp->hd_address = ioremap(addr.address.minimum, addr.address.address_length);
986
987 if (hpet_is_known(hdp)) {
988 iounmap(hdp->hd_address);
989 return AE_ALREADY_EXISTS;
990 }
991 } else if (res->type == ACPI_RESOURCE_TYPE_FIXED_MEMORY32) {
992 struct acpi_resource_fixed_memory32 *fixmem32;
993
994 fixmem32 = &res->data.fixed_memory32;
995 if (!fixmem32)
996 return AE_NO_MEMORY;
997
998 hdp->hd_phys_address = fixmem32->address;
999 hdp->hd_address = ioremap(fixmem32->address,
1000 HPET_RANGE_SIZE);
1001
1002 if (hpet_is_known(hdp)) {
1003 iounmap(hdp->hd_address);
1004 return AE_ALREADY_EXISTS;
1005 }
1006 } else if (res->type == ACPI_RESOURCE_TYPE_EXTENDED_IRQ) {
1007 struct acpi_resource_extended_irq *irqp;
1008 int i, irq;
1009
1010 irqp = &res->data.extended_irq;
1011
1012 for (i = 0; i < irqp->interrupt_count; i++) {
1013 if (hdp->hd_nirqs >= HPET_MAX_TIMERS)
1014 break;
1015
1016 irq = acpi_register_gsi(NULL, irqp->interrupts[i],
1017 irqp->triggering, irqp->polarity);
1018 if (irq < 0)
1019 return AE_ERROR;
1020
1021 hdp->hd_irq[hdp->hd_nirqs] = irq;
1022 hdp->hd_nirqs++;
1023 }
1024 }
1025
1026 return AE_OK;
1027}
1028
1029static int hpet_acpi_add(struct acpi_device *device)
1030{
1031 acpi_status result;
1032 struct hpet_data data;
1033
1034 memset(&data, 0, sizeof(data));
1035
1036 result =
1037 acpi_walk_resources(device->handle, METHOD_NAME__CRS,
1038 hpet_resources, &data);
1039
1040 if (ACPI_FAILURE(result))
1041 return -ENODEV;
1042
1043 if (!data.hd_address || !data.hd_nirqs) {
1044 if (data.hd_address)
1045 iounmap(data.hd_address);
1046 printk("%s: no address or irqs in _CRS\n", __func__);
1047 return -ENODEV;
1048 }
1049
1050 return hpet_alloc(&data);
1051}
1052
1053static int hpet_acpi_remove(struct acpi_device *device)
1054{
1055
1056 return -EINVAL;
1057}
1058
1059static const struct acpi_device_id hpet_device_ids[] = {
1060 {"PNP0103", 0},
1061 {"", 0},
1062};
1063MODULE_DEVICE_TABLE(acpi, hpet_device_ids);
1064
1065static struct acpi_driver hpet_acpi_driver = {
1066 .name = "hpet",
1067 .ids = hpet_device_ids,
1068 .ops = {
1069 .add = hpet_acpi_add,
1070 .remove = hpet_acpi_remove,
1071 },
1072};
1073
1074static struct miscdevice hpet_misc = { HPET_MINOR, "hpet", &hpet_fops };
1075
1076static int __init hpet_init(void)
1077{
1078 int result;
1079
1080 result = misc_register(&hpet_misc);
1081 if (result < 0)
1082 return -ENODEV;
1083
1084 sysctl_header = register_sysctl_table(dev_root);
1085
1086 result = acpi_bus_register_driver(&hpet_acpi_driver);
1087 if (result < 0) {
1088 if (sysctl_header)
1089 unregister_sysctl_table(sysctl_header);
1090 misc_deregister(&hpet_misc);
1091 return result;
1092 }
1093
1094 return 0;
1095}
1096
1097static void __exit hpet_exit(void)
1098{
1099 acpi_bus_unregister_driver(&hpet_acpi_driver);
1100
1101 if (sysctl_header)
1102 unregister_sysctl_table(sysctl_header);
1103 misc_deregister(&hpet_misc);
1104
1105 return;
1106}
1107
1108module_init(hpet_init);
1109module_exit(hpet_exit);
1110MODULE_AUTHOR("Bob Picco <Robert.Picco@hp.com>");
1111MODULE_LICENSE("GPL");
1112