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11#include <linux/interrupt.h>
12#include <linux/kernel.h>
13#include <linux/types.h>
14#include <linux/miscdevice.h>
15#include <linux/major.h>
16#include <linux/ioport.h>
17#include <linux/fcntl.h>
18#include <linux/init.h>
19#include <linux/poll.h>
20#include <linux/mm.h>
21#include <linux/proc_fs.h>
22#include <linux/spinlock.h>
23#include <linux/sysctl.h>
24#include <linux/wait.h>
25#include <linux/sched/signal.h>
26#include <linux/bcd.h>
27#include <linux/seq_file.h>
28#include <linux/bitops.h>
29#include <linux/compat.h>
30#include <linux/clocksource.h>
31#include <linux/uaccess.h>
32#include <linux/slab.h>
33#include <linux/io.h>
34#include <linux/acpi.h>
35#include <linux/hpet.h>
36#include <asm/current.h>
37#include <asm/irq.h>
38#include <asm/div64.h>
39
40
41
42
43
44
45#define HPET_USER_FREQ (64)
46#define HPET_DRIFT (500)
47
48#define HPET_RANGE_SIZE 1024
49
50
51
52
53
54
55#if BITS_PER_LONG == 64
56#define write_counter(V, MC) writeq(V, MC)
57#define read_counter(MC) readq(MC)
58#else
59#define write_counter(V, MC) writel(V, MC)
60#define read_counter(MC) readl(MC)
61#endif
62
63static DEFINE_MUTEX(hpet_mutex);
64static u32 hpet_nhpet, hpet_max_freq = HPET_USER_FREQ;
65
66
67#ifdef CONFIG_IA64
68static void __iomem *hpet_mctr;
69
70static u64 read_hpet(struct clocksource *cs)
71{
72 return (u64)read_counter((void __iomem *)hpet_mctr);
73}
74
75static struct clocksource clocksource_hpet = {
76 .name = "hpet",
77 .rating = 250,
78 .read = read_hpet,
79 .mask = CLOCKSOURCE_MASK(64),
80 .flags = CLOCK_SOURCE_IS_CONTINUOUS,
81};
82static struct clocksource *hpet_clocksource;
83#endif
84
85
86static DEFINE_SPINLOCK(hpet_lock);
87
88#define HPET_DEV_NAME (7)
89
90struct hpet_dev {
91 struct hpets *hd_hpets;
92 struct hpet __iomem *hd_hpet;
93 struct hpet_timer __iomem *hd_timer;
94 unsigned long hd_ireqfreq;
95 unsigned long hd_irqdata;
96 wait_queue_head_t hd_waitqueue;
97 struct fasync_struct *hd_async_queue;
98 unsigned int hd_flags;
99 unsigned int hd_irq;
100 unsigned int hd_hdwirq;
101 char hd_name[HPET_DEV_NAME];
102};
103
104struct hpets {
105 struct hpets *hp_next;
106 struct hpet __iomem *hp_hpet;
107 unsigned long hp_hpet_phys;
108 struct clocksource *hp_clocksource;
109 unsigned long long hp_tick_freq;
110 unsigned long hp_delta;
111 unsigned int hp_ntimer;
112 unsigned int hp_which;
113 struct hpet_dev hp_dev[1];
114};
115
116static struct hpets *hpets;
117
118#define HPET_OPEN 0x0001
119#define HPET_IE 0x0002
120#define HPET_PERIODIC 0x0004
121#define HPET_SHARED_IRQ 0x0008
122
123
124#ifndef readq
125static inline unsigned long long readq(void __iomem *addr)
126{
127 return readl(addr) | (((unsigned long long)readl(addr + 4)) << 32LL);
128}
129#endif
130
131#ifndef writeq
132static inline void writeq(unsigned long long v, void __iomem *addr)
133{
134 writel(v & 0xffffffff, addr);
135 writel(v >> 32, addr + 4);
136}
137#endif
138
139static irqreturn_t hpet_interrupt(int irq, void *data)
140{
141 struct hpet_dev *devp;
142 unsigned long isr;
143
144 devp = data;
145 isr = 1 << (devp - devp->hd_hpets->hp_dev);
146
147 if ((devp->hd_flags & HPET_SHARED_IRQ) &&
148 !(isr & readl(&devp->hd_hpet->hpet_isr)))
149 return IRQ_NONE;
150
151 spin_lock(&hpet_lock);
152 devp->hd_irqdata++;
153
154
155
156
157
158 if ((devp->hd_flags & (HPET_IE | HPET_PERIODIC)) == HPET_IE) {
159 unsigned long m, t, mc, base, k;
160 struct hpet __iomem *hpet = devp->hd_hpet;
161 struct hpets *hpetp = devp->hd_hpets;
162
163 t = devp->hd_ireqfreq;
164 m = read_counter(&devp->hd_timer->hpet_compare);
165 mc = read_counter(&hpet->hpet_mc);
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181 base = mc % t;
182 k = (mc - base + hpetp->hp_delta) / t;
183 write_counter(t * (k + 1) + base,
184 &devp->hd_timer->hpet_compare);
185 }
186
187 if (devp->hd_flags & HPET_SHARED_IRQ)
188 writel(isr, &devp->hd_hpet->hpet_isr);
189 spin_unlock(&hpet_lock);
190
191 wake_up_interruptible(&devp->hd_waitqueue);
192
193 kill_fasync(&devp->hd_async_queue, SIGIO, POLL_IN);
194
195 return IRQ_HANDLED;
196}
197
198static void hpet_timer_set_irq(struct hpet_dev *devp)
199{
200 unsigned long v;
201 int irq, gsi;
202 struct hpet_timer __iomem *timer;
203
204 spin_lock_irq(&hpet_lock);
205 if (devp->hd_hdwirq) {
206 spin_unlock_irq(&hpet_lock);
207 return;
208 }
209
210 timer = devp->hd_timer;
211
212
213 v = readl(&timer->hpet_config);
214 if (!(v & Tn_INT_TYPE_CNF_MASK)) {
215 v |= Tn_INT_TYPE_CNF_MASK;
216 writel(v, &timer->hpet_config);
217 }
218 spin_unlock_irq(&hpet_lock);
219
220 v = (readq(&timer->hpet_config) & Tn_INT_ROUTE_CAP_MASK) >>
221 Tn_INT_ROUTE_CAP_SHIFT;
222
223
224
225
226
227 if (acpi_irq_model == ACPI_IRQ_MODEL_PIC)
228 v &= ~0xf3df;
229 else
230 v &= ~0xffff;
231
232 for_each_set_bit(irq, &v, HPET_MAX_IRQ) {
233 if (irq >= nr_irqs) {
234 irq = HPET_MAX_IRQ;
235 break;
236 }
237
238 gsi = acpi_register_gsi(NULL, irq, ACPI_LEVEL_SENSITIVE,
239 ACPI_ACTIVE_LOW);
240 if (gsi > 0)
241 break;
242
243
244 }
245
246 if (irq < HPET_MAX_IRQ) {
247 spin_lock_irq(&hpet_lock);
248 v = readl(&timer->hpet_config);
249 v |= irq << Tn_INT_ROUTE_CNF_SHIFT;
250 writel(v, &timer->hpet_config);
251 devp->hd_hdwirq = gsi;
252 spin_unlock_irq(&hpet_lock);
253 }
254 return;
255}
256
257static int hpet_open(struct inode *inode, struct file *file)
258{
259 struct hpet_dev *devp;
260 struct hpets *hpetp;
261 int i;
262
263 if (file->f_mode & FMODE_WRITE)
264 return -EINVAL;
265
266 mutex_lock(&hpet_mutex);
267 spin_lock_irq(&hpet_lock);
268
269 for (devp = NULL, hpetp = hpets; hpetp && !devp; hpetp = hpetp->hp_next)
270 for (i = 0; i < hpetp->hp_ntimer; i++)
271 if (hpetp->hp_dev[i].hd_flags & HPET_OPEN)
272 continue;
273 else {
274 devp = &hpetp->hp_dev[i];
275 break;
276 }
277
278 if (!devp) {
279 spin_unlock_irq(&hpet_lock);
280 mutex_unlock(&hpet_mutex);
281 return -EBUSY;
282 }
283
284 file->private_data = devp;
285 devp->hd_irqdata = 0;
286 devp->hd_flags |= HPET_OPEN;
287 spin_unlock_irq(&hpet_lock);
288 mutex_unlock(&hpet_mutex);
289
290 hpet_timer_set_irq(devp);
291
292 return 0;
293}
294
295static ssize_t
296hpet_read(struct file *file, char __user *buf, size_t count, loff_t * ppos)
297{
298 DECLARE_WAITQUEUE(wait, current);
299 unsigned long data;
300 ssize_t retval;
301 struct hpet_dev *devp;
302
303 devp = file->private_data;
304 if (!devp->hd_ireqfreq)
305 return -EIO;
306
307 if (count < sizeof(unsigned long))
308 return -EINVAL;
309
310 add_wait_queue(&devp->hd_waitqueue, &wait);
311
312 for ( ; ; ) {
313 set_current_state(TASK_INTERRUPTIBLE);
314
315 spin_lock_irq(&hpet_lock);
316 data = devp->hd_irqdata;
317 devp->hd_irqdata = 0;
318 spin_unlock_irq(&hpet_lock);
319
320 if (data)
321 break;
322 else if (file->f_flags & O_NONBLOCK) {
323 retval = -EAGAIN;
324 goto out;
325 } else if (signal_pending(current)) {
326 retval = -ERESTARTSYS;
327 goto out;
328 }
329 schedule();
330 }
331
332 retval = put_user(data, (unsigned long __user *)buf);
333 if (!retval)
334 retval = sizeof(unsigned long);
335out:
336 __set_current_state(TASK_RUNNING);
337 remove_wait_queue(&devp->hd_waitqueue, &wait);
338
339 return retval;
340}
341
342static __poll_t hpet_poll(struct file *file, poll_table * wait)
343{
344 unsigned long v;
345 struct hpet_dev *devp;
346
347 devp = file->private_data;
348
349 if (!devp->hd_ireqfreq)
350 return 0;
351
352 poll_wait(file, &devp->hd_waitqueue, wait);
353
354 spin_lock_irq(&hpet_lock);
355 v = devp->hd_irqdata;
356 spin_unlock_irq(&hpet_lock);
357
358 if (v != 0)
359 return EPOLLIN | EPOLLRDNORM;
360
361 return 0;
362}
363
364#ifdef CONFIG_HPET_MMAP
365#ifdef CONFIG_HPET_MMAP_DEFAULT
366static int hpet_mmap_enabled = 1;
367#else
368static int hpet_mmap_enabled = 0;
369#endif
370
371static __init int hpet_mmap_enable(char *str)
372{
373 get_option(&str, &hpet_mmap_enabled);
374 pr_info("HPET mmap %s\n", hpet_mmap_enabled ? "enabled" : "disabled");
375 return 1;
376}
377__setup("hpet_mmap=", hpet_mmap_enable);
378
379static int hpet_mmap(struct file *file, struct vm_area_struct *vma)
380{
381 struct hpet_dev *devp;
382 unsigned long addr;
383
384 if (!hpet_mmap_enabled)
385 return -EACCES;
386
387 devp = file->private_data;
388 addr = devp->hd_hpets->hp_hpet_phys;
389
390 if (addr & (PAGE_SIZE - 1))
391 return -ENOSYS;
392
393 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
394 return vm_iomap_memory(vma, addr, PAGE_SIZE);
395}
396#else
397static int hpet_mmap(struct file *file, struct vm_area_struct *vma)
398{
399 return -ENOSYS;
400}
401#endif
402
403static int hpet_fasync(int fd, struct file *file, int on)
404{
405 struct hpet_dev *devp;
406
407 devp = file->private_data;
408
409 if (fasync_helper(fd, file, on, &devp->hd_async_queue) >= 0)
410 return 0;
411 else
412 return -EIO;
413}
414
415static int hpet_release(struct inode *inode, struct file *file)
416{
417 struct hpet_dev *devp;
418 struct hpet_timer __iomem *timer;
419 int irq = 0;
420
421 devp = file->private_data;
422 timer = devp->hd_timer;
423
424 spin_lock_irq(&hpet_lock);
425
426 writeq((readq(&timer->hpet_config) & ~Tn_INT_ENB_CNF_MASK),
427 &timer->hpet_config);
428
429 irq = devp->hd_irq;
430 devp->hd_irq = 0;
431
432 devp->hd_ireqfreq = 0;
433
434 if (devp->hd_flags & HPET_PERIODIC
435 && readq(&timer->hpet_config) & Tn_TYPE_CNF_MASK) {
436 unsigned long v;
437
438 v = readq(&timer->hpet_config);
439 v ^= Tn_TYPE_CNF_MASK;
440 writeq(v, &timer->hpet_config);
441 }
442
443 devp->hd_flags &= ~(HPET_OPEN | HPET_IE | HPET_PERIODIC);
444 spin_unlock_irq(&hpet_lock);
445
446 if (irq)
447 free_irq(irq, devp);
448
449 file->private_data = NULL;
450 return 0;
451}
452
453static int hpet_ioctl_ieon(struct hpet_dev *devp)
454{
455 struct hpet_timer __iomem *timer;
456 struct hpet __iomem *hpet;
457 struct hpets *hpetp;
458 int irq;
459 unsigned long g, v, t, m;
460 unsigned long flags, isr;
461
462 timer = devp->hd_timer;
463 hpet = devp->hd_hpet;
464 hpetp = devp->hd_hpets;
465
466 if (!devp->hd_ireqfreq)
467 return -EIO;
468
469 spin_lock_irq(&hpet_lock);
470
471 if (devp->hd_flags & HPET_IE) {
472 spin_unlock_irq(&hpet_lock);
473 return -EBUSY;
474 }
475
476 devp->hd_flags |= HPET_IE;
477
478 if (readl(&timer->hpet_config) & Tn_INT_TYPE_CNF_MASK)
479 devp->hd_flags |= HPET_SHARED_IRQ;
480 spin_unlock_irq(&hpet_lock);
481
482 irq = devp->hd_hdwirq;
483
484 if (irq) {
485 unsigned long irq_flags;
486
487 if (devp->hd_flags & HPET_SHARED_IRQ) {
488
489
490
491
492
493 writel(readl(&timer->hpet_config) & ~Tn_TYPE_CNF_MASK,
494 &timer->hpet_config);
495 write_counter(read_counter(&hpet->hpet_mc),
496 &timer->hpet_compare);
497
498 isr = 1 << (devp - devp->hd_hpets->hp_dev);
499 writel(isr, &hpet->hpet_isr);
500 }
501
502 sprintf(devp->hd_name, "hpet%d", (int)(devp - hpetp->hp_dev));
503 irq_flags = devp->hd_flags & HPET_SHARED_IRQ ? IRQF_SHARED : 0;
504 if (request_irq(irq, hpet_interrupt, irq_flags,
505 devp->hd_name, (void *)devp)) {
506 printk(KERN_ERR "hpet: IRQ %d is not free\n", irq);
507 irq = 0;
508 }
509 }
510
511 if (irq == 0) {
512 spin_lock_irq(&hpet_lock);
513 devp->hd_flags ^= HPET_IE;
514 spin_unlock_irq(&hpet_lock);
515 return -EIO;
516 }
517
518 devp->hd_irq = irq;
519 t = devp->hd_ireqfreq;
520 v = readq(&timer->hpet_config);
521
522
523
524
525 g = v | Tn_32MODE_CNF_MASK | Tn_INT_ENB_CNF_MASK;
526
527 if (devp->hd_flags & HPET_PERIODIC) {
528 g |= Tn_TYPE_CNF_MASK;
529 v |= Tn_TYPE_CNF_MASK | Tn_VAL_SET_CNF_MASK;
530 writeq(v, &timer->hpet_config);
531 local_irq_save(flags);
532
533
534
535
536
537
538
539
540 m = read_counter(&hpet->hpet_mc);
541 write_counter(t + m + hpetp->hp_delta, &timer->hpet_compare);
542
543
544
545
546 write_counter(t, &timer->hpet_compare);
547 } else {
548 local_irq_save(flags);
549 m = read_counter(&hpet->hpet_mc);
550 write_counter(t + m + hpetp->hp_delta, &timer->hpet_compare);
551 }
552
553 if (devp->hd_flags & HPET_SHARED_IRQ) {
554 isr = 1 << (devp - devp->hd_hpets->hp_dev);
555 writel(isr, &hpet->hpet_isr);
556 }
557 writeq(g, &timer->hpet_config);
558 local_irq_restore(flags);
559
560 return 0;
561}
562
563
564static inline unsigned long hpet_time_div(struct hpets *hpets,
565 unsigned long dis)
566{
567 unsigned long long m;
568
569 m = hpets->hp_tick_freq + (dis >> 1);
570 do_div(m, dis);
571 return (unsigned long)m;
572}
573
574static int
575hpet_ioctl_common(struct hpet_dev *devp, unsigned int cmd, unsigned long arg,
576 struct hpet_info *info)
577{
578 struct hpet_timer __iomem *timer;
579 struct hpets *hpetp;
580 int err;
581 unsigned long v;
582
583 switch (cmd) {
584 case HPET_IE_OFF:
585 case HPET_INFO:
586 case HPET_EPI:
587 case HPET_DPI:
588 case HPET_IRQFREQ:
589 timer = devp->hd_timer;
590 hpetp = devp->hd_hpets;
591 break;
592 case HPET_IE_ON:
593 return hpet_ioctl_ieon(devp);
594 default:
595 return -EINVAL;
596 }
597
598 err = 0;
599
600 switch (cmd) {
601 case HPET_IE_OFF:
602 if ((devp->hd_flags & HPET_IE) == 0)
603 break;
604 v = readq(&timer->hpet_config);
605 v &= ~Tn_INT_ENB_CNF_MASK;
606 writeq(v, &timer->hpet_config);
607 if (devp->hd_irq) {
608 free_irq(devp->hd_irq, devp);
609 devp->hd_irq = 0;
610 }
611 devp->hd_flags ^= HPET_IE;
612 break;
613 case HPET_INFO:
614 {
615 memset(info, 0, sizeof(*info));
616 if (devp->hd_ireqfreq)
617 info->hi_ireqfreq =
618 hpet_time_div(hpetp, devp->hd_ireqfreq);
619 info->hi_flags =
620 readq(&timer->hpet_config) & Tn_PER_INT_CAP_MASK;
621 info->hi_hpet = hpetp->hp_which;
622 info->hi_timer = devp - hpetp->hp_dev;
623 break;
624 }
625 case HPET_EPI:
626 v = readq(&timer->hpet_config);
627 if ((v & Tn_PER_INT_CAP_MASK) == 0) {
628 err = -ENXIO;
629 break;
630 }
631 devp->hd_flags |= HPET_PERIODIC;
632 break;
633 case HPET_DPI:
634 v = readq(&timer->hpet_config);
635 if ((v & Tn_PER_INT_CAP_MASK) == 0) {
636 err = -ENXIO;
637 break;
638 }
639 if (devp->hd_flags & HPET_PERIODIC &&
640 readq(&timer->hpet_config) & Tn_TYPE_CNF_MASK) {
641 v = readq(&timer->hpet_config);
642 v ^= Tn_TYPE_CNF_MASK;
643 writeq(v, &timer->hpet_config);
644 }
645 devp->hd_flags &= ~HPET_PERIODIC;
646 break;
647 case HPET_IRQFREQ:
648 if ((arg > hpet_max_freq) &&
649 !capable(CAP_SYS_RESOURCE)) {
650 err = -EACCES;
651 break;
652 }
653
654 if (!arg) {
655 err = -EINVAL;
656 break;
657 }
658
659 devp->hd_ireqfreq = hpet_time_div(hpetp, arg);
660 }
661
662 return err;
663}
664
665static long
666hpet_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
667{
668 struct hpet_info info;
669 int err;
670
671 mutex_lock(&hpet_mutex);
672 err = hpet_ioctl_common(file->private_data, cmd, arg, &info);
673 mutex_unlock(&hpet_mutex);
674
675 if ((cmd == HPET_INFO) && !err &&
676 (copy_to_user((void __user *)arg, &info, sizeof(info))))
677 err = -EFAULT;
678
679 return err;
680}
681
682#ifdef CONFIG_COMPAT
683struct compat_hpet_info {
684 compat_ulong_t hi_ireqfreq;
685 compat_ulong_t hi_flags;
686 unsigned short hi_hpet;
687 unsigned short hi_timer;
688};
689
690static long
691hpet_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
692{
693 struct hpet_info info;
694 int err;
695
696 mutex_lock(&hpet_mutex);
697 err = hpet_ioctl_common(file->private_data, cmd, arg, &info);
698 mutex_unlock(&hpet_mutex);
699
700 if ((cmd == HPET_INFO) && !err) {
701 struct compat_hpet_info __user *u = compat_ptr(arg);
702 if (put_user(info.hi_ireqfreq, &u->hi_ireqfreq) ||
703 put_user(info.hi_flags, &u->hi_flags) ||
704 put_user(info.hi_hpet, &u->hi_hpet) ||
705 put_user(info.hi_timer, &u->hi_timer))
706 err = -EFAULT;
707 }
708
709 return err;
710}
711#endif
712
713static const struct file_operations hpet_fops = {
714 .owner = THIS_MODULE,
715 .llseek = no_llseek,
716 .read = hpet_read,
717 .poll = hpet_poll,
718 .unlocked_ioctl = hpet_ioctl,
719#ifdef CONFIG_COMPAT
720 .compat_ioctl = hpet_compat_ioctl,
721#endif
722 .open = hpet_open,
723 .release = hpet_release,
724 .fasync = hpet_fasync,
725 .mmap = hpet_mmap,
726};
727
728static int hpet_is_known(struct hpet_data *hdp)
729{
730 struct hpets *hpetp;
731
732 for (hpetp = hpets; hpetp; hpetp = hpetp->hp_next)
733 if (hpetp->hp_hpet_phys == hdp->hd_phys_address)
734 return 1;
735
736 return 0;
737}
738
739static struct ctl_table hpet_table[] = {
740 {
741 .procname = "max-user-freq",
742 .data = &hpet_max_freq,
743 .maxlen = sizeof(int),
744 .mode = 0644,
745 .proc_handler = proc_dointvec,
746 },
747 {}
748};
749
750static struct ctl_table hpet_root[] = {
751 {
752 .procname = "hpet",
753 .maxlen = 0,
754 .mode = 0555,
755 .child = hpet_table,
756 },
757 {}
758};
759
760static struct ctl_table dev_root[] = {
761 {
762 .procname = "dev",
763 .maxlen = 0,
764 .mode = 0555,
765 .child = hpet_root,
766 },
767 {}
768};
769
770static struct ctl_table_header *sysctl_header;
771
772
773
774
775
776
777#define TICK_CALIBRATE (1000UL)
778
779static unsigned long __hpet_calibrate(struct hpets *hpetp)
780{
781 struct hpet_timer __iomem *timer = NULL;
782 unsigned long t, m, count, i, flags, start;
783 struct hpet_dev *devp;
784 int j;
785 struct hpet __iomem *hpet;
786
787 for (j = 0, devp = hpetp->hp_dev; j < hpetp->hp_ntimer; j++, devp++)
788 if ((devp->hd_flags & HPET_OPEN) == 0) {
789 timer = devp->hd_timer;
790 break;
791 }
792
793 if (!timer)
794 return 0;
795
796 hpet = hpetp->hp_hpet;
797 t = read_counter(&timer->hpet_compare);
798
799 i = 0;
800 count = hpet_time_div(hpetp, TICK_CALIBRATE);
801
802 local_irq_save(flags);
803
804 start = read_counter(&hpet->hpet_mc);
805
806 do {
807 m = read_counter(&hpet->hpet_mc);
808 write_counter(t + m + hpetp->hp_delta, &timer->hpet_compare);
809 } while (i++, (m - start) < count);
810
811 local_irq_restore(flags);
812
813 return (m - start) / i;
814}
815
816static unsigned long hpet_calibrate(struct hpets *hpetp)
817{
818 unsigned long ret = ~0UL;
819 unsigned long tmp;
820
821
822
823
824
825
826 for ( ; ; ) {
827 tmp = __hpet_calibrate(hpetp);
828 if (ret <= tmp)
829 break;
830 ret = tmp;
831 }
832
833 return ret;
834}
835
836int hpet_alloc(struct hpet_data *hdp)
837{
838 u64 cap, mcfg;
839 struct hpet_dev *devp;
840 u32 i, ntimer;
841 struct hpets *hpetp;
842 struct hpet __iomem *hpet;
843 static struct hpets *last;
844 unsigned long period;
845 unsigned long long temp;
846 u32 remainder;
847
848
849
850
851
852
853 if (hpet_is_known(hdp)) {
854 printk(KERN_DEBUG "%s: duplicate HPET ignored\n",
855 __func__);
856 return 0;
857 }
858
859 hpetp = kzalloc(struct_size(hpetp, hp_dev, hdp->hd_nirqs - 1),
860 GFP_KERNEL);
861
862 if (!hpetp)
863 return -ENOMEM;
864
865 hpetp->hp_which = hpet_nhpet++;
866 hpetp->hp_hpet = hdp->hd_address;
867 hpetp->hp_hpet_phys = hdp->hd_phys_address;
868
869 hpetp->hp_ntimer = hdp->hd_nirqs;
870
871 for (i = 0; i < hdp->hd_nirqs; i++)
872 hpetp->hp_dev[i].hd_hdwirq = hdp->hd_irq[i];
873
874 hpet = hpetp->hp_hpet;
875
876 cap = readq(&hpet->hpet_cap);
877
878 ntimer = ((cap & HPET_NUM_TIM_CAP_MASK) >> HPET_NUM_TIM_CAP_SHIFT) + 1;
879
880 if (hpetp->hp_ntimer != ntimer) {
881 printk(KERN_WARNING "hpet: number irqs doesn't agree"
882 " with number of timers\n");
883 kfree(hpetp);
884 return -ENODEV;
885 }
886
887 if (last)
888 last->hp_next = hpetp;
889 else
890 hpets = hpetp;
891
892 last = hpetp;
893
894 period = (cap & HPET_COUNTER_CLK_PERIOD_MASK) >>
895 HPET_COUNTER_CLK_PERIOD_SHIFT;
896 temp = 1000000000000000uLL;
897 temp += period >> 1;
898 do_div(temp, period);
899 hpetp->hp_tick_freq = temp;
900
901 printk(KERN_INFO "hpet%d: at MMIO 0x%lx, IRQ%s",
902 hpetp->hp_which, hdp->hd_phys_address,
903 hpetp->hp_ntimer > 1 ? "s" : "");
904 for (i = 0; i < hpetp->hp_ntimer; i++)
905 printk(KERN_CONT "%s %d", i > 0 ? "," : "", hdp->hd_irq[i]);
906 printk(KERN_CONT "\n");
907
908 temp = hpetp->hp_tick_freq;
909 remainder = do_div(temp, 1000000);
910 printk(KERN_INFO
911 "hpet%u: %u comparators, %d-bit %u.%06u MHz counter\n",
912 hpetp->hp_which, hpetp->hp_ntimer,
913 cap & HPET_COUNTER_SIZE_MASK ? 64 : 32,
914 (unsigned) temp, remainder);
915
916 mcfg = readq(&hpet->hpet_config);
917 if ((mcfg & HPET_ENABLE_CNF_MASK) == 0) {
918 write_counter(0L, &hpet->hpet_mc);
919 mcfg |= HPET_ENABLE_CNF_MASK;
920 writeq(mcfg, &hpet->hpet_config);
921 }
922
923 for (i = 0, devp = hpetp->hp_dev; i < hpetp->hp_ntimer; i++, devp++) {
924 struct hpet_timer __iomem *timer;
925
926 timer = &hpet->hpet_timers[devp - hpetp->hp_dev];
927
928 devp->hd_hpets = hpetp;
929 devp->hd_hpet = hpet;
930 devp->hd_timer = timer;
931
932
933
934
935
936 if (hdp->hd_state & (1 << i)) {
937 devp->hd_flags = HPET_OPEN;
938 continue;
939 }
940
941 init_waitqueue_head(&devp->hd_waitqueue);
942 }
943
944 hpetp->hp_delta = hpet_calibrate(hpetp);
945
946
947#ifdef CONFIG_IA64
948 if (!hpet_clocksource) {
949 hpet_mctr = (void __iomem *)&hpetp->hp_hpet->hpet_mc;
950 clocksource_hpet.archdata.fsys_mmio = hpet_mctr;
951 clocksource_register_hz(&clocksource_hpet, hpetp->hp_tick_freq);
952 hpetp->hp_clocksource = &clocksource_hpet;
953 hpet_clocksource = &clocksource_hpet;
954 }
955#endif
956
957 return 0;
958}
959
960static acpi_status hpet_resources(struct acpi_resource *res, void *data)
961{
962 struct hpet_data *hdp;
963 acpi_status status;
964 struct acpi_resource_address64 addr;
965
966 hdp = data;
967
968 status = acpi_resource_to_address64(res, &addr);
969
970 if (ACPI_SUCCESS(status)) {
971 hdp->hd_phys_address = addr.address.minimum;
972 hdp->hd_address = ioremap(addr.address.minimum, addr.address.address_length);
973 if (!hdp->hd_address)
974 return AE_ERROR;
975
976 if (hpet_is_known(hdp)) {
977 iounmap(hdp->hd_address);
978 return AE_ALREADY_EXISTS;
979 }
980 } else if (res->type == ACPI_RESOURCE_TYPE_FIXED_MEMORY32) {
981 struct acpi_resource_fixed_memory32 *fixmem32;
982
983 fixmem32 = &res->data.fixed_memory32;
984
985 hdp->hd_phys_address = fixmem32->address;
986 hdp->hd_address = ioremap(fixmem32->address,
987 HPET_RANGE_SIZE);
988
989 if (hpet_is_known(hdp)) {
990 iounmap(hdp->hd_address);
991 return AE_ALREADY_EXISTS;
992 }
993 } else if (res->type == ACPI_RESOURCE_TYPE_EXTENDED_IRQ) {
994 struct acpi_resource_extended_irq *irqp;
995 int i, irq;
996
997 irqp = &res->data.extended_irq;
998
999 for (i = 0; i < irqp->interrupt_count; i++) {
1000 if (hdp->hd_nirqs >= HPET_MAX_TIMERS)
1001 break;
1002
1003 irq = acpi_register_gsi(NULL, irqp->interrupts[i],
1004 irqp->triggering, irqp->polarity);
1005 if (irq < 0)
1006 return AE_ERROR;
1007
1008 hdp->hd_irq[hdp->hd_nirqs] = irq;
1009 hdp->hd_nirqs++;
1010 }
1011 }
1012
1013 return AE_OK;
1014}
1015
1016static int hpet_acpi_add(struct acpi_device *device)
1017{
1018 acpi_status result;
1019 struct hpet_data data;
1020
1021 memset(&data, 0, sizeof(data));
1022
1023 result =
1024 acpi_walk_resources(device->handle, METHOD_NAME__CRS,
1025 hpet_resources, &data);
1026
1027 if (ACPI_FAILURE(result))
1028 return -ENODEV;
1029
1030 if (!data.hd_address || !data.hd_nirqs) {
1031 if (data.hd_address)
1032 iounmap(data.hd_address);
1033 printk("%s: no address or irqs in _CRS\n", __func__);
1034 return -ENODEV;
1035 }
1036
1037 return hpet_alloc(&data);
1038}
1039
1040static const struct acpi_device_id hpet_device_ids[] = {
1041 {"PNP0103", 0},
1042 {"", 0},
1043};
1044
1045static struct acpi_driver hpet_acpi_driver = {
1046 .name = "hpet",
1047 .ids = hpet_device_ids,
1048 .ops = {
1049 .add = hpet_acpi_add,
1050 },
1051};
1052
1053static struct miscdevice hpet_misc = { HPET_MINOR, "hpet", &hpet_fops };
1054
1055static int __init hpet_init(void)
1056{
1057 int result;
1058
1059 result = misc_register(&hpet_misc);
1060 if (result < 0)
1061 return -ENODEV;
1062
1063 sysctl_header = register_sysctl_table(dev_root);
1064
1065 result = acpi_bus_register_driver(&hpet_acpi_driver);
1066 if (result < 0) {
1067 if (sysctl_header)
1068 unregister_sysctl_table(sysctl_header);
1069 misc_deregister(&hpet_misc);
1070 return result;
1071 }
1072
1073 return 0;
1074}
1075device_initcall(hpet_init);
1076
1077
1078
1079
1080
1081