2 * Intel & MS High Precision Event Timer Implementation.
4 * Copyright (C) 2003 Intel Corporation
6 * (c) Copyright 2004 Hewlett-Packard Development Company, L.P.
7 * Bob Picco <robert.picco@hp.com>
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.
14 #include <linux/config.h>
15 #include <linux/interrupt.h>
16 #include <linux/module.h>
17 #include <linux/kernel.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/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>
33 #include <asm/current.h>
34 #include <asm/uaccess.h>
35 #include <asm/system.h>
38 #include <asm/div64.h>
40 #include <linux/acpi.h>
41 #include <acpi/acpi_bus.h>
42 #include <linux/hpet.h>
45 * The High Precision Event Timer driver.
46 * This driver is closely modelled after the rtc.c driver.
47 * http://www.intel.com/hardwaredesign/hpetspec.htm
49 #define HPET_USER_FREQ (64)
50 #define HPET_DRIFT (500)
52 static u32 hpet_ntimer
, hpet_nhpet
, hpet_max_freq
= HPET_USER_FREQ
;
54 /* A lock for concurrent access by app and isr hpet activity. */
55 static DEFINE_SPINLOCK(hpet_lock
);
56 /* A lock for concurrent intermodule access to hpet and isr hpet activity. */
57 static DEFINE_SPINLOCK(hpet_task_lock
);
59 #define HPET_DEV_NAME (7)
62 struct hpets
*hd_hpets
;
63 struct hpet __iomem
*hd_hpet
;
64 struct hpet_timer __iomem
*hd_timer
;
65 unsigned long hd_ireqfreq
;
66 unsigned long hd_irqdata
;
67 wait_queue_head_t hd_waitqueue
;
68 struct fasync_struct
*hd_async_queue
;
69 struct hpet_task
*hd_task
;
70 unsigned int hd_flags
;
72 unsigned int hd_hdwirq
;
73 char hd_name
[HPET_DEV_NAME
];
77 struct hpets
*hp_next
;
78 struct hpet __iomem
*hp_hpet
;
79 unsigned long hp_hpet_phys
;
80 struct time_interpolator
*hp_interpolator
;
81 unsigned long hp_period
;
82 unsigned long hp_delta
;
83 unsigned int hp_ntimer
;
84 unsigned int hp_which
;
85 struct hpet_dev hp_dev
[1];
88 static struct hpets
*hpets
;
90 #define HPET_OPEN 0x0001
91 #define HPET_IE 0x0002 /* interrupt enabled */
92 #define HPET_PERIODIC 0x0004
94 #if BITS_PER_LONG == 64
95 #define write_counter(V, MC) writeq(V, MC)
96 #define read_counter(MC) readq(MC)
98 #define write_counter(V, MC) writel(V, MC)
99 #define read_counter(MC) readl(MC)
103 static inline unsigned long long readq(void __iomem
*addr
)
105 return readl(addr
) | (((unsigned long long)readl(addr
+ 4)) << 32LL);
110 static inline void writeq(unsigned long long v
, void __iomem
*addr
)
112 writel(v
& 0xffffffff, addr
);
113 writel(v
>> 32, addr
+ 4);
117 static irqreturn_t
hpet_interrupt(int irq
, void *data
, struct pt_regs
*regs
)
119 struct hpet_dev
*devp
;
124 spin_lock(&hpet_lock
);
128 * For non-periodic timers, increment the accumulator.
129 * This has the effect of treating non-periodic like periodic.
131 if ((devp
->hd_flags
& (HPET_IE
| HPET_PERIODIC
)) == HPET_IE
) {
134 t
= devp
->hd_ireqfreq
;
135 m
= read_counter(&devp
->hd_hpet
->hpet_mc
);
136 write_counter(t
+ m
+ devp
->hd_hpets
->hp_delta
,
137 &devp
->hd_timer
->hpet_compare
);
140 isr
= (1 << (devp
- devp
->hd_hpets
->hp_dev
));
141 writeq(isr
, &devp
->hd_hpet
->hpet_isr
);
142 spin_unlock(&hpet_lock
);
144 spin_lock(&hpet_task_lock
);
146 devp
->hd_task
->ht_func(devp
->hd_task
->ht_data
);
147 spin_unlock(&hpet_task_lock
);
149 wake_up_interruptible(&devp
->hd_waitqueue
);
151 kill_fasync(&devp
->hd_async_queue
, SIGIO
, POLL_IN
);
156 static int hpet_open(struct inode
*inode
, struct file
*file
)
158 struct hpet_dev
*devp
;
162 if (file
->f_mode
& FMODE_WRITE
)
165 spin_lock_irq(&hpet_lock
);
167 for (devp
= NULL
, hpetp
= hpets
; hpetp
&& !devp
; hpetp
= hpetp
->hp_next
)
168 for (i
= 0; i
< hpetp
->hp_ntimer
; i
++)
169 if (hpetp
->hp_dev
[i
].hd_flags
& HPET_OPEN
170 || hpetp
->hp_dev
[i
].hd_task
)
173 devp
= &hpetp
->hp_dev
[i
];
178 spin_unlock_irq(&hpet_lock
);
182 file
->private_data
= devp
;
183 devp
->hd_irqdata
= 0;
184 devp
->hd_flags
|= HPET_OPEN
;
185 spin_unlock_irq(&hpet_lock
);
191 hpet_read(struct file
*file
, char __user
*buf
, size_t count
, loff_t
* ppos
)
193 DECLARE_WAITQUEUE(wait
, current
);
196 struct hpet_dev
*devp
;
198 devp
= file
->private_data
;
199 if (!devp
->hd_ireqfreq
)
202 if (count
< sizeof(unsigned long))
205 add_wait_queue(&devp
->hd_waitqueue
, &wait
);
208 set_current_state(TASK_INTERRUPTIBLE
);
210 spin_lock_irq(&hpet_lock
);
211 data
= devp
->hd_irqdata
;
212 devp
->hd_irqdata
= 0;
213 spin_unlock_irq(&hpet_lock
);
217 else if (file
->f_flags
& O_NONBLOCK
) {
220 } else if (signal_pending(current
)) {
221 retval
= -ERESTARTSYS
;
227 retval
= put_user(data
, (unsigned long __user
*)buf
);
229 retval
= sizeof(unsigned long);
231 __set_current_state(TASK_RUNNING
);
232 remove_wait_queue(&devp
->hd_waitqueue
, &wait
);
237 static unsigned int hpet_poll(struct file
*file
, poll_table
* wait
)
240 struct hpet_dev
*devp
;
242 devp
= file
->private_data
;
244 if (!devp
->hd_ireqfreq
)
247 poll_wait(file
, &devp
->hd_waitqueue
, wait
);
249 spin_lock_irq(&hpet_lock
);
250 v
= devp
->hd_irqdata
;
251 spin_unlock_irq(&hpet_lock
);
254 return POLLIN
| POLLRDNORM
;
259 static int hpet_mmap(struct file
*file
, struct vm_area_struct
*vma
)
261 #ifdef CONFIG_HPET_MMAP
262 struct hpet_dev
*devp
;
265 if (((vma
->vm_end
- vma
->vm_start
) != PAGE_SIZE
) || vma
->vm_pgoff
)
268 devp
= file
->private_data
;
269 addr
= devp
->hd_hpets
->hp_hpet_phys
;
271 if (addr
& (PAGE_SIZE
- 1))
274 vma
->vm_flags
|= VM_IO
;
275 vma
->vm_page_prot
= pgprot_noncached(vma
->vm_page_prot
);
277 if (io_remap_pfn_range(vma
, vma
->vm_start
, addr
>> PAGE_SHIFT
,
278 PAGE_SIZE
, vma
->vm_page_prot
)) {
279 printk(KERN_ERR
"remap_pfn_range failed in hpet.c\n");
289 static int hpet_fasync(int fd
, struct file
*file
, int on
)
291 struct hpet_dev
*devp
;
293 devp
= file
->private_data
;
295 if (fasync_helper(fd
, file
, on
, &devp
->hd_async_queue
) >= 0)
301 static int hpet_release(struct inode
*inode
, struct file
*file
)
303 struct hpet_dev
*devp
;
304 struct hpet_timer __iomem
*timer
;
307 devp
= file
->private_data
;
308 timer
= devp
->hd_timer
;
310 spin_lock_irq(&hpet_lock
);
312 writeq((readq(&timer
->hpet_config
) & ~Tn_INT_ENB_CNF_MASK
),
313 &timer
->hpet_config
);
318 devp
->hd_ireqfreq
= 0;
320 if (devp
->hd_flags
& HPET_PERIODIC
321 && readq(&timer
->hpet_config
) & Tn_TYPE_CNF_MASK
) {
324 v
= readq(&timer
->hpet_config
);
325 v
^= Tn_TYPE_CNF_MASK
;
326 writeq(v
, &timer
->hpet_config
);
329 devp
->hd_flags
&= ~(HPET_OPEN
| HPET_IE
| HPET_PERIODIC
);
330 spin_unlock_irq(&hpet_lock
);
335 if (file
->f_flags
& FASYNC
)
336 hpet_fasync(-1, file
, 0);
338 file
->private_data
= NULL
;
342 static int hpet_ioctl_common(struct hpet_dev
*, int, unsigned long, int);
345 hpet_ioctl(struct inode
*inode
, struct file
*file
, unsigned int cmd
,
348 struct hpet_dev
*devp
;
350 devp
= file
->private_data
;
351 return hpet_ioctl_common(devp
, cmd
, arg
, 0);
354 static int hpet_ioctl_ieon(struct hpet_dev
*devp
)
356 struct hpet_timer __iomem
*timer
;
357 struct hpet __iomem
*hpet
;
360 unsigned long g
, v
, t
, m
;
361 unsigned long flags
, isr
;
363 timer
= devp
->hd_timer
;
364 hpet
= devp
->hd_hpet
;
365 hpetp
= devp
->hd_hpets
;
367 v
= readq(&timer
->hpet_config
);
368 spin_lock_irq(&hpet_lock
);
370 if (devp
->hd_flags
& HPET_IE
) {
371 spin_unlock_irq(&hpet_lock
);
375 devp
->hd_flags
|= HPET_IE
;
376 spin_unlock_irq(&hpet_lock
);
378 t
= readq(&timer
->hpet_config
);
379 irq
= devp
->hd_hdwirq
;
382 sprintf(devp
->hd_name
, "hpet%d", (int)(devp
- hpetp
->hp_dev
));
385 (irq
, hpet_interrupt
, SA_INTERRUPT
, devp
->hd_name
, (void *)devp
)) {
386 printk(KERN_ERR
"hpet: IRQ %d is not free\n", irq
);
392 spin_lock_irq(&hpet_lock
);
393 devp
->hd_flags
^= HPET_IE
;
394 spin_unlock_irq(&hpet_lock
);
399 t
= devp
->hd_ireqfreq
;
400 v
= readq(&timer
->hpet_config
);
401 g
= v
| Tn_INT_ENB_CNF_MASK
;
403 if (devp
->hd_flags
& HPET_PERIODIC
) {
404 write_counter(t
, &timer
->hpet_compare
);
405 g
|= Tn_TYPE_CNF_MASK
;
406 v
|= Tn_TYPE_CNF_MASK
;
407 writeq(v
, &timer
->hpet_config
);
408 v
|= Tn_VAL_SET_CNF_MASK
;
409 writeq(v
, &timer
->hpet_config
);
410 local_irq_save(flags
);
411 m
= read_counter(&hpet
->hpet_mc
);
412 write_counter(t
+ m
+ hpetp
->hp_delta
, &timer
->hpet_compare
);
414 local_irq_save(flags
);
415 m
= read_counter(&hpet
->hpet_mc
);
416 write_counter(t
+ m
+ hpetp
->hp_delta
, &timer
->hpet_compare
);
419 isr
= (1 << (devp
- hpets
->hp_dev
));
420 writeq(isr
, &hpet
->hpet_isr
);
421 writeq(g
, &timer
->hpet_config
);
422 local_irq_restore(flags
);
427 static inline unsigned long hpet_time_div(unsigned long dis
)
429 unsigned long long m
= 1000000000000000ULL;
433 return (unsigned long)m
;
437 hpet_ioctl_common(struct hpet_dev
*devp
, int cmd
, unsigned long arg
, int kernel
)
439 struct hpet_timer __iomem
*timer
;
440 struct hpet __iomem
*hpet
;
451 timer
= devp
->hd_timer
;
452 hpet
= devp
->hd_hpet
;
453 hpetp
= devp
->hd_hpets
;
456 return hpet_ioctl_ieon(devp
);
465 if ((devp
->hd_flags
& HPET_IE
) == 0)
467 v
= readq(&timer
->hpet_config
);
468 v
&= ~Tn_INT_ENB_CNF_MASK
;
469 writeq(v
, &timer
->hpet_config
);
471 free_irq(devp
->hd_irq
, devp
);
474 devp
->hd_flags
^= HPET_IE
;
478 struct hpet_info info
;
480 info
.hi_ireqfreq
= hpet_time_div(hpetp
->hp_period
*
483 readq(&timer
->hpet_config
) & Tn_PER_INT_CAP_MASK
;
484 info
.hi_hpet
= devp
->hd_hpets
->hp_which
;
485 info
.hi_timer
= devp
- devp
->hd_hpets
->hp_dev
;
486 if (copy_to_user((void __user
*)arg
, &info
, sizeof(info
)))
491 v
= readq(&timer
->hpet_config
);
492 if ((v
& Tn_PER_INT_CAP_MASK
) == 0) {
496 devp
->hd_flags
|= HPET_PERIODIC
;
499 v
= readq(&timer
->hpet_config
);
500 if ((v
& Tn_PER_INT_CAP_MASK
) == 0) {
504 if (devp
->hd_flags
& HPET_PERIODIC
&&
505 readq(&timer
->hpet_config
) & Tn_TYPE_CNF_MASK
) {
506 v
= readq(&timer
->hpet_config
);
507 v
^= Tn_TYPE_CNF_MASK
;
508 writeq(v
, &timer
->hpet_config
);
510 devp
->hd_flags
&= ~HPET_PERIODIC
;
513 if (!kernel
&& (arg
> hpet_max_freq
) &&
514 !capable(CAP_SYS_RESOURCE
)) {
519 if (arg
& (arg
- 1)) {
524 devp
->hd_ireqfreq
= hpet_time_div(hpetp
->hp_period
* arg
);
530 static struct file_operations hpet_fops
= {
531 .owner
= THIS_MODULE
,
537 .release
= hpet_release
,
538 .fasync
= hpet_fasync
,
542 EXPORT_SYMBOL(hpet_alloc
);
543 EXPORT_SYMBOL(hpet_register
);
544 EXPORT_SYMBOL(hpet_unregister
);
545 EXPORT_SYMBOL(hpet_control
);
547 int hpet_register(struct hpet_task
*tp
, int periodic
)
551 struct hpet_timer __iomem
*timer
;
552 struct hpet_dev
*devp
;
557 mask
= Tn_PER_INT_CAP_MASK
;
566 spin_lock_irq(&hpet_task_lock
);
567 spin_lock(&hpet_lock
);
569 for (devp
= NULL
, hpetp
= hpets
; hpetp
&& !devp
; hpetp
= hpetp
->hp_next
)
570 for (timer
= hpetp
->hp_hpet
->hpet_timers
, i
= 0;
571 i
< hpetp
->hp_ntimer
; i
++, timer
++) {
572 if ((readq(&timer
->hpet_config
) & Tn_PER_INT_CAP_MASK
)
576 devp
= &hpetp
->hp_dev
[i
];
578 if (devp
->hd_flags
& HPET_OPEN
|| devp
->hd_task
) {
583 tp
->ht_opaque
= devp
;
588 spin_unlock(&hpet_lock
);
589 spin_unlock_irq(&hpet_task_lock
);
597 static inline int hpet_tpcheck(struct hpet_task
*tp
)
599 struct hpet_dev
*devp
;
602 devp
= tp
->ht_opaque
;
607 for (hpetp
= hpets
; hpetp
; hpetp
= hpetp
->hp_next
)
608 if (devp
>= hpetp
->hp_dev
609 && devp
< (hpetp
->hp_dev
+ hpetp
->hp_ntimer
)
610 && devp
->hd_hpet
== hpetp
->hp_hpet
)
616 int hpet_unregister(struct hpet_task
*tp
)
618 struct hpet_dev
*devp
;
619 struct hpet_timer __iomem
*timer
;
622 if ((err
= hpet_tpcheck(tp
)))
625 spin_lock_irq(&hpet_task_lock
);
626 spin_lock(&hpet_lock
);
628 devp
= tp
->ht_opaque
;
629 if (devp
->hd_task
!= tp
) {
630 spin_unlock(&hpet_lock
);
631 spin_unlock_irq(&hpet_task_lock
);
635 timer
= devp
->hd_timer
;
636 writeq((readq(&timer
->hpet_config
) & ~Tn_INT_ENB_CNF_MASK
),
637 &timer
->hpet_config
);
638 devp
->hd_flags
&= ~(HPET_IE
| HPET_PERIODIC
);
639 devp
->hd_task
= NULL
;
640 spin_unlock(&hpet_lock
);
641 spin_unlock_irq(&hpet_task_lock
);
646 int hpet_control(struct hpet_task
*tp
, unsigned int cmd
, unsigned long arg
)
648 struct hpet_dev
*devp
;
651 if ((err
= hpet_tpcheck(tp
)))
654 spin_lock_irq(&hpet_lock
);
655 devp
= tp
->ht_opaque
;
656 if (devp
->hd_task
!= tp
) {
657 spin_unlock_irq(&hpet_lock
);
660 spin_unlock_irq(&hpet_lock
);
661 return hpet_ioctl_common(devp
, cmd
, arg
, 1);
664 static ctl_table hpet_table
[] = {
667 .procname
= "max-user-freq",
668 .data
= &hpet_max_freq
,
669 .maxlen
= sizeof(int),
671 .proc_handler
= &proc_dointvec
,
676 static ctl_table hpet_root
[] = {
687 static ctl_table dev_root
[] = {
698 static struct ctl_table_header
*sysctl_header
;
700 static void hpet_register_interpolator(struct hpets
*hpetp
)
702 #ifdef CONFIG_TIME_INTERPOLATION
703 struct time_interpolator
*ti
;
705 ti
= kmalloc(sizeof(*ti
), GFP_KERNEL
);
709 memset(ti
, 0, sizeof(*ti
));
710 ti
->source
= TIME_SOURCE_MMIO64
;
712 ti
->addr
= &hpetp
->hp_hpet
->hpet_mc
;
713 ti
->frequency
= hpet_time_div(hpets
->hp_period
);
714 ti
->drift
= HPET_DRIFT
;
717 hpetp
->hp_interpolator
= ti
;
718 register_time_interpolator(ti
);
723 * Adjustment for when arming the timer with
724 * initial conditions. That is, main counter
725 * ticks expired before interrupts are enabled.
727 #define TICK_CALIBRATE (1000UL)
729 static unsigned long hpet_calibrate(struct hpets
*hpetp
)
731 struct hpet_timer __iomem
*timer
= NULL
;
732 unsigned long t
, m
, count
, i
, flags
, start
;
733 struct hpet_dev
*devp
;
735 struct hpet __iomem
*hpet
;
737 for (j
= 0, devp
= hpetp
->hp_dev
; j
< hpetp
->hp_ntimer
; j
++, devp
++)
738 if ((devp
->hd_flags
& HPET_OPEN
) == 0) {
739 timer
= devp
->hd_timer
;
746 hpet
= hpets
->hp_hpet
;
747 t
= read_counter(&timer
->hpet_compare
);
750 count
= hpet_time_div(hpetp
->hp_period
* TICK_CALIBRATE
);
752 local_irq_save(flags
);
754 start
= read_counter(&hpet
->hpet_mc
);
757 m
= read_counter(&hpet
->hpet_mc
);
758 write_counter(t
+ m
+ hpetp
->hp_delta
, &timer
->hpet_compare
);
759 } while (i
++, (m
- start
) < count
);
761 local_irq_restore(flags
);
763 return (m
- start
) / i
;
766 int hpet_alloc(struct hpet_data
*hdp
)
769 struct hpet_dev
*devp
;
773 struct hpet __iomem
*hpet
;
774 static struct hpets
*last
= (struct hpets
*)0;
778 * hpet_alloc can be called by platform dependent code.
779 * if platform dependent code has allocated the hpet
780 * ACPI also reports hpet, then we catch it here.
782 for (hpetp
= hpets
; hpetp
; hpetp
= hpetp
->hp_next
)
783 if (hpetp
->hp_hpet
== hdp
->hd_address
)
786 siz
= sizeof(struct hpets
) + ((hdp
->hd_nirqs
- 1) *
787 sizeof(struct hpet_dev
));
789 hpetp
= kmalloc(siz
, GFP_KERNEL
);
794 memset(hpetp
, 0, siz
);
796 hpetp
->hp_which
= hpet_nhpet
++;
797 hpetp
->hp_hpet
= hdp
->hd_address
;
798 hpetp
->hp_hpet_phys
= hdp
->hd_phys_address
;
800 hpetp
->hp_ntimer
= hdp
->hd_nirqs
;
802 for (i
= 0; i
< hdp
->hd_nirqs
; i
++)
803 hpetp
->hp_dev
[i
].hd_hdwirq
= hdp
->hd_irq
[i
];
805 hpet
= hpetp
->hp_hpet
;
807 cap
= readq(&hpet
->hpet_cap
);
809 ntimer
= ((cap
& HPET_NUM_TIM_CAP_MASK
) >> HPET_NUM_TIM_CAP_SHIFT
) + 1;
811 if (hpetp
->hp_ntimer
!= ntimer
) {
812 printk(KERN_WARNING
"hpet: number irqs doesn't agree"
813 " with number of timers\n");
819 last
->hp_next
= hpetp
;
825 hpetp
->hp_period
= (cap
& HPET_COUNTER_CLK_PERIOD_MASK
) >>
826 HPET_COUNTER_CLK_PERIOD_SHIFT
;
828 printk(KERN_INFO
"hpet%d: at MMIO 0x%lx, IRQ%s",
829 hpetp
->hp_which
, hdp
->hd_phys_address
,
830 hpetp
->hp_ntimer
> 1 ? "s" : "");
831 for (i
= 0; i
< hpetp
->hp_ntimer
; i
++)
832 printk("%s %d", i
> 0 ? "," : "", hdp
->hd_irq
[i
]);
835 ns
= hpetp
->hp_period
; /* femptoseconds, 10^-15 */
836 ns
/= 1000000; /* convert to nanoseconds, 10^-9 */
837 printk(KERN_INFO
"hpet%d: %ldns tick, %d %d-bit timers\n",
838 hpetp
->hp_which
, ns
, hpetp
->hp_ntimer
,
839 cap
& HPET_COUNTER_SIZE_MASK
? 64 : 32);
841 mcfg
= readq(&hpet
->hpet_config
);
842 if ((mcfg
& HPET_ENABLE_CNF_MASK
) == 0) {
843 write_counter(0L, &hpet
->hpet_mc
);
844 mcfg
|= HPET_ENABLE_CNF_MASK
;
845 writeq(mcfg
, &hpet
->hpet_config
);
848 for (i
= 0, devp
= hpetp
->hp_dev
; i
< hpetp
->hp_ntimer
;
849 i
++, hpet_ntimer
++, devp
++) {
851 struct hpet_timer __iomem
*timer
;
853 timer
= &hpet
->hpet_timers
[devp
- hpetp
->hp_dev
];
854 v
= readq(&timer
->hpet_config
);
856 devp
->hd_hpets
= hpetp
;
857 devp
->hd_hpet
= hpet
;
858 devp
->hd_timer
= timer
;
861 * If the timer was reserved by platform code,
862 * then make timer unavailable for opens.
864 if (hdp
->hd_state
& (1 << i
)) {
865 devp
->hd_flags
= HPET_OPEN
;
869 init_waitqueue_head(&devp
->hd_waitqueue
);
872 hpetp
->hp_delta
= hpet_calibrate(hpetp
);
873 hpet_register_interpolator(hpetp
);
878 static acpi_status
hpet_resources(struct acpi_resource
*res
, void *data
)
880 struct hpet_data
*hdp
;
882 struct acpi_resource_address64 addr
;
887 status
= acpi_resource_to_address64(res
, &addr
);
889 if (ACPI_SUCCESS(status
)) {
892 size
= addr
.max_address_range
- addr
.min_address_range
+ 1;
893 hdp
->hd_phys_address
= addr
.min_address_range
;
894 hdp
->hd_address
= ioremap(addr
.min_address_range
, size
);
896 for (hpetp
= hpets
; hpetp
; hpetp
= hpetp
->hp_next
)
897 if (hpetp
->hp_hpet
== hdp
->hd_address
)
899 } else if (res
->id
== ACPI_RSTYPE_EXT_IRQ
) {
900 struct acpi_resource_ext_irq
*irqp
;
903 irqp
= &res
->data
.extended_irq
;
905 if (irqp
->number_of_interrupts
> 0) {
906 hdp
->hd_nirqs
= irqp
->number_of_interrupts
;
908 for (i
= 0; i
< hdp
->hd_nirqs
; i
++) {
910 acpi_register_gsi(irqp
->interrupts
[i
],
912 irqp
->active_high_low
);
923 static int hpet_acpi_add(struct acpi_device
*device
)
926 struct hpet_data data
;
928 memset(&data
, 0, sizeof(data
));
931 acpi_walk_resources(device
->handle
, METHOD_NAME__CRS
,
932 hpet_resources
, &data
);
934 if (ACPI_FAILURE(result
))
937 if (!data
.hd_address
|| !data
.hd_nirqs
) {
938 printk("%s: no address or irqs in _CRS\n", __FUNCTION__
);
942 return hpet_alloc(&data
);
945 static int hpet_acpi_remove(struct acpi_device
*device
, int type
)
947 /* XXX need to unregister interpolator, dealloc mem, etc */
951 static struct acpi_driver hpet_acpi_driver
= {
955 .add
= hpet_acpi_add
,
956 .remove
= hpet_acpi_remove
,
960 static struct miscdevice hpet_misc
= { HPET_MINOR
, "hpet", &hpet_fops
};
962 static int __init
hpet_init(void)
966 result
= misc_register(&hpet_misc
);
970 sysctl_header
= register_sysctl_table(dev_root
, 0);
972 result
= acpi_bus_register_driver(&hpet_acpi_driver
);
975 unregister_sysctl_table(sysctl_header
);
976 misc_deregister(&hpet_misc
);
983 static void __exit
hpet_exit(void)
985 acpi_bus_unregister_driver(&hpet_acpi_driver
);
988 unregister_sysctl_table(sysctl_header
);
989 misc_deregister(&hpet_misc
);
994 module_init(hpet_init
);
995 module_exit(hpet_exit
);
996 MODULE_AUTHOR("Bob Picco <Robert.Picco@hp.com>");
997 MODULE_LICENSE("GPL");