iwlwifi: compilation error when CONFIG_IWLWIFI_DEBUG is not set
[linux-2.6] / drivers / char / hpet.c
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");