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/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>
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 #include <linux/slab.h>
36 #include <asm/current.h>
37 #include <asm/uaccess.h>
38 #include <asm/system.h>
41 #include <asm/div64.h>
43 #include <linux/acpi.h>
44 #include <acpi/acpi_bus.h>
45 #include <linux/hpet.h>
48 * The High Precision Event Timer driver.
49 * This driver is closely modelled after the rtc.c driver.
50 * http://www.intel.com/hardwaredesign/hpetspec_1.pdf
52 #define HPET_USER_FREQ (64)
53 #define HPET_DRIFT (500)
55 #define HPET_RANGE_SIZE 1024 /* from HPET spec */
58 /* WARNING -- don't get confused. These macros are never used
59 * to write the (single) counter, and rarely to read it.
60 * They're badly named; to fix, someday.
62 #if BITS_PER_LONG == 64
63 #define write_counter(V, MC) writeq(V, MC)
64 #define read_counter(MC) readq(MC)
66 #define write_counter(V, MC) writel(V, MC)
67 #define read_counter(MC) readl(MC)
70 static u32 hpet_nhpet
, hpet_max_freq
= HPET_USER_FREQ
;
72 /* This clocksource driver currently only works on ia64 */
74 static void __iomem
*hpet_mctr
;
76 static cycle_t
read_hpet(struct clocksource
*cs
)
78 return (cycle_t
)read_counter((void __iomem
*)hpet_mctr
);
81 static struct clocksource clocksource_hpet
= {
85 .mask
= CLOCKSOURCE_MASK(64),
86 .mult
= 0, /* to be calculated */
88 .flags
= CLOCK_SOURCE_IS_CONTINUOUS
,
90 static struct clocksource
*hpet_clocksource
;
93 /* A lock for concurrent access by app and isr hpet activity. */
94 static DEFINE_SPINLOCK(hpet_lock
);
96 #define HPET_DEV_NAME (7)
99 struct hpets
*hd_hpets
;
100 struct hpet __iomem
*hd_hpet
;
101 struct hpet_timer __iomem
*hd_timer
;
102 unsigned long hd_ireqfreq
;
103 unsigned long hd_irqdata
;
104 wait_queue_head_t hd_waitqueue
;
105 struct fasync_struct
*hd_async_queue
;
106 unsigned int hd_flags
;
108 unsigned int hd_hdwirq
;
109 char hd_name
[HPET_DEV_NAME
];
113 struct hpets
*hp_next
;
114 struct hpet __iomem
*hp_hpet
;
115 unsigned long hp_hpet_phys
;
116 struct clocksource
*hp_clocksource
;
117 unsigned long long hp_tick_freq
;
118 unsigned long hp_delta
;
119 unsigned int hp_ntimer
;
120 unsigned int hp_which
;
121 struct hpet_dev hp_dev
[1];
124 static struct hpets
*hpets
;
126 #define HPET_OPEN 0x0001
127 #define HPET_IE 0x0002 /* interrupt enabled */
128 #define HPET_PERIODIC 0x0004
129 #define HPET_SHARED_IRQ 0x0008
133 static inline unsigned long long readq(void __iomem
*addr
)
135 return readl(addr
) | (((unsigned long long)readl(addr
+ 4)) << 32LL);
140 static inline void writeq(unsigned long long v
, void __iomem
*addr
)
142 writel(v
& 0xffffffff, addr
);
143 writel(v
>> 32, addr
+ 4);
147 static irqreturn_t
hpet_interrupt(int irq
, void *data
)
149 struct hpet_dev
*devp
;
153 isr
= 1 << (devp
- devp
->hd_hpets
->hp_dev
);
155 if ((devp
->hd_flags
& HPET_SHARED_IRQ
) &&
156 !(isr
& readl(&devp
->hd_hpet
->hpet_isr
)))
159 spin_lock(&hpet_lock
);
163 * For non-periodic timers, increment the accumulator.
164 * This has the effect of treating non-periodic like periodic.
166 if ((devp
->hd_flags
& (HPET_IE
| HPET_PERIODIC
)) == HPET_IE
) {
169 t
= devp
->hd_ireqfreq
;
170 m
= read_counter(&devp
->hd_timer
->hpet_compare
);
171 write_counter(t
+ m
, &devp
->hd_timer
->hpet_compare
);
174 if (devp
->hd_flags
& HPET_SHARED_IRQ
)
175 writel(isr
, &devp
->hd_hpet
->hpet_isr
);
176 spin_unlock(&hpet_lock
);
178 wake_up_interruptible(&devp
->hd_waitqueue
);
180 kill_fasync(&devp
->hd_async_queue
, SIGIO
, POLL_IN
);
185 static void hpet_timer_set_irq(struct hpet_dev
*devp
)
189 struct hpet_timer __iomem
*timer
;
191 spin_lock_irq(&hpet_lock
);
192 if (devp
->hd_hdwirq
) {
193 spin_unlock_irq(&hpet_lock
);
197 timer
= devp
->hd_timer
;
199 /* we prefer level triggered mode */
200 v
= readl(&timer
->hpet_config
);
201 if (!(v
& Tn_INT_TYPE_CNF_MASK
)) {
202 v
|= Tn_INT_TYPE_CNF_MASK
;
203 writel(v
, &timer
->hpet_config
);
205 spin_unlock_irq(&hpet_lock
);
207 v
= (readq(&timer
->hpet_config
) & Tn_INT_ROUTE_CAP_MASK
) >>
208 Tn_INT_ROUTE_CAP_SHIFT
;
211 * In PIC mode, skip IRQ0-4, IRQ6-9, IRQ12-15 which is always used by
212 * legacy device. In IO APIC mode, we skip all the legacy IRQS.
214 if (acpi_irq_model
== ACPI_IRQ_MODEL_PIC
)
219 for_each_set_bit(irq
, &v
, HPET_MAX_IRQ
) {
220 if (irq
>= nr_irqs
) {
225 gsi
= acpi_register_gsi(NULL
, irq
, ACPI_LEVEL_SENSITIVE
,
230 /* FIXME: Setup interrupt source table */
233 if (irq
< HPET_MAX_IRQ
) {
234 spin_lock_irq(&hpet_lock
);
235 v
= readl(&timer
->hpet_config
);
236 v
|= irq
<< Tn_INT_ROUTE_CNF_SHIFT
;
237 writel(v
, &timer
->hpet_config
);
238 devp
->hd_hdwirq
= gsi
;
239 spin_unlock_irq(&hpet_lock
);
244 static int hpet_open(struct inode
*inode
, struct file
*file
)
246 struct hpet_dev
*devp
;
250 if (file
->f_mode
& FMODE_WRITE
)
254 spin_lock_irq(&hpet_lock
);
256 for (devp
= NULL
, hpetp
= hpets
; hpetp
&& !devp
; hpetp
= hpetp
->hp_next
)
257 for (i
= 0; i
< hpetp
->hp_ntimer
; i
++)
258 if (hpetp
->hp_dev
[i
].hd_flags
& HPET_OPEN
)
261 devp
= &hpetp
->hp_dev
[i
];
266 spin_unlock_irq(&hpet_lock
);
271 file
->private_data
= devp
;
272 devp
->hd_irqdata
= 0;
273 devp
->hd_flags
|= HPET_OPEN
;
274 spin_unlock_irq(&hpet_lock
);
277 hpet_timer_set_irq(devp
);
283 hpet_read(struct file
*file
, char __user
*buf
, size_t count
, loff_t
* ppos
)
285 DECLARE_WAITQUEUE(wait
, current
);
288 struct hpet_dev
*devp
;
290 devp
= file
->private_data
;
291 if (!devp
->hd_ireqfreq
)
294 if (count
< sizeof(unsigned long))
297 add_wait_queue(&devp
->hd_waitqueue
, &wait
);
300 set_current_state(TASK_INTERRUPTIBLE
);
302 spin_lock_irq(&hpet_lock
);
303 data
= devp
->hd_irqdata
;
304 devp
->hd_irqdata
= 0;
305 spin_unlock_irq(&hpet_lock
);
309 else if (file
->f_flags
& O_NONBLOCK
) {
312 } else if (signal_pending(current
)) {
313 retval
= -ERESTARTSYS
;
319 retval
= put_user(data
, (unsigned long __user
*)buf
);
321 retval
= sizeof(unsigned long);
323 __set_current_state(TASK_RUNNING
);
324 remove_wait_queue(&devp
->hd_waitqueue
, &wait
);
329 static unsigned int hpet_poll(struct file
*file
, poll_table
* wait
)
332 struct hpet_dev
*devp
;
334 devp
= file
->private_data
;
336 if (!devp
->hd_ireqfreq
)
339 poll_wait(file
, &devp
->hd_waitqueue
, wait
);
341 spin_lock_irq(&hpet_lock
);
342 v
= devp
->hd_irqdata
;
343 spin_unlock_irq(&hpet_lock
);
346 return POLLIN
| POLLRDNORM
;
351 static int hpet_mmap(struct file
*file
, struct vm_area_struct
*vma
)
353 #ifdef CONFIG_HPET_MMAP
354 struct hpet_dev
*devp
;
357 if (((vma
->vm_end
- vma
->vm_start
) != PAGE_SIZE
) || vma
->vm_pgoff
)
360 devp
= file
->private_data
;
361 addr
= devp
->hd_hpets
->hp_hpet_phys
;
363 if (addr
& (PAGE_SIZE
- 1))
366 vma
->vm_flags
|= VM_IO
;
367 vma
->vm_page_prot
= pgprot_noncached(vma
->vm_page_prot
);
369 if (io_remap_pfn_range(vma
, vma
->vm_start
, addr
>> PAGE_SHIFT
,
370 PAGE_SIZE
, vma
->vm_page_prot
)) {
371 printk(KERN_ERR
"%s: io_remap_pfn_range failed\n",
382 static int hpet_fasync(int fd
, struct file
*file
, int on
)
384 struct hpet_dev
*devp
;
386 devp
= file
->private_data
;
388 if (fasync_helper(fd
, file
, on
, &devp
->hd_async_queue
) >= 0)
394 static int hpet_release(struct inode
*inode
, struct file
*file
)
396 struct hpet_dev
*devp
;
397 struct hpet_timer __iomem
*timer
;
400 devp
= file
->private_data
;
401 timer
= devp
->hd_timer
;
403 spin_lock_irq(&hpet_lock
);
405 writeq((readq(&timer
->hpet_config
) & ~Tn_INT_ENB_CNF_MASK
),
406 &timer
->hpet_config
);
411 devp
->hd_ireqfreq
= 0;
413 if (devp
->hd_flags
& HPET_PERIODIC
414 && readq(&timer
->hpet_config
) & Tn_TYPE_CNF_MASK
) {
417 v
= readq(&timer
->hpet_config
);
418 v
^= Tn_TYPE_CNF_MASK
;
419 writeq(v
, &timer
->hpet_config
);
422 devp
->hd_flags
&= ~(HPET_OPEN
| HPET_IE
| HPET_PERIODIC
);
423 spin_unlock_irq(&hpet_lock
);
428 file
->private_data
= NULL
;
432 static int hpet_ioctl_common(struct hpet_dev
*, int, unsigned long, int);
435 hpet_ioctl(struct inode
*inode
, struct file
*file
, unsigned int cmd
,
438 struct hpet_dev
*devp
;
440 devp
= file
->private_data
;
441 return hpet_ioctl_common(devp
, cmd
, arg
, 0);
444 static int hpet_ioctl_ieon(struct hpet_dev
*devp
)
446 struct hpet_timer __iomem
*timer
;
447 struct hpet __iomem
*hpet
;
450 unsigned long g
, v
, t
, m
;
451 unsigned long flags
, isr
;
453 timer
= devp
->hd_timer
;
454 hpet
= devp
->hd_hpet
;
455 hpetp
= devp
->hd_hpets
;
457 if (!devp
->hd_ireqfreq
)
460 spin_lock_irq(&hpet_lock
);
462 if (devp
->hd_flags
& HPET_IE
) {
463 spin_unlock_irq(&hpet_lock
);
467 devp
->hd_flags
|= HPET_IE
;
469 if (readl(&timer
->hpet_config
) & Tn_INT_TYPE_CNF_MASK
)
470 devp
->hd_flags
|= HPET_SHARED_IRQ
;
471 spin_unlock_irq(&hpet_lock
);
473 irq
= devp
->hd_hdwirq
;
476 unsigned long irq_flags
;
478 sprintf(devp
->hd_name
, "hpet%d", (int)(devp
- hpetp
->hp_dev
));
479 irq_flags
= devp
->hd_flags
& HPET_SHARED_IRQ
480 ? IRQF_SHARED
: IRQF_DISABLED
;
481 if (request_irq(irq
, hpet_interrupt
, irq_flags
,
482 devp
->hd_name
, (void *)devp
)) {
483 printk(KERN_ERR
"hpet: IRQ %d is not free\n", irq
);
489 spin_lock_irq(&hpet_lock
);
490 devp
->hd_flags
^= HPET_IE
;
491 spin_unlock_irq(&hpet_lock
);
496 t
= devp
->hd_ireqfreq
;
497 v
= readq(&timer
->hpet_config
);
499 /* 64-bit comparators are not yet supported through the ioctls,
500 * so force this into 32-bit mode if it supports both modes
502 g
= v
| Tn_32MODE_CNF_MASK
| Tn_INT_ENB_CNF_MASK
;
504 if (devp
->hd_flags
& HPET_PERIODIC
) {
505 g
|= Tn_TYPE_CNF_MASK
;
506 v
|= Tn_TYPE_CNF_MASK
| Tn_VAL_SET_CNF_MASK
;
507 writeq(v
, &timer
->hpet_config
);
508 local_irq_save(flags
);
511 * NOTE: First we modify the hidden accumulator
512 * register supported by periodic-capable comparators.
513 * We never want to modify the (single) counter; that
514 * would affect all the comparators. The value written
515 * is the counter value when the first interrupt is due.
517 m
= read_counter(&hpet
->hpet_mc
);
518 write_counter(t
+ m
+ hpetp
->hp_delta
, &timer
->hpet_compare
);
520 * Then we modify the comparator, indicating the period
521 * for subsequent interrupt.
523 write_counter(t
, &timer
->hpet_compare
);
525 local_irq_save(flags
);
526 m
= read_counter(&hpet
->hpet_mc
);
527 write_counter(t
+ m
+ hpetp
->hp_delta
, &timer
->hpet_compare
);
530 if (devp
->hd_flags
& HPET_SHARED_IRQ
) {
531 isr
= 1 << (devp
- devp
->hd_hpets
->hp_dev
);
532 writel(isr
, &hpet
->hpet_isr
);
534 writeq(g
, &timer
->hpet_config
);
535 local_irq_restore(flags
);
540 /* converts Hz to number of timer ticks */
541 static inline unsigned long hpet_time_div(struct hpets
*hpets
,
544 unsigned long long m
;
546 m
= hpets
->hp_tick_freq
+ (dis
>> 1);
548 return (unsigned long)m
;
552 hpet_ioctl_common(struct hpet_dev
*devp
, int cmd
, unsigned long arg
, int kernel
)
554 struct hpet_timer __iomem
*timer
;
555 struct hpet __iomem
*hpet
;
566 timer
= devp
->hd_timer
;
567 hpet
= devp
->hd_hpet
;
568 hpetp
= devp
->hd_hpets
;
571 return hpet_ioctl_ieon(devp
);
580 if ((devp
->hd_flags
& HPET_IE
) == 0)
582 v
= readq(&timer
->hpet_config
);
583 v
&= ~Tn_INT_ENB_CNF_MASK
;
584 writeq(v
, &timer
->hpet_config
);
586 free_irq(devp
->hd_irq
, devp
);
589 devp
->hd_flags
^= HPET_IE
;
593 struct hpet_info info
;
595 if (devp
->hd_ireqfreq
)
597 hpet_time_div(hpetp
, devp
->hd_ireqfreq
);
599 info
.hi_ireqfreq
= 0;
601 readq(&timer
->hpet_config
) & Tn_PER_INT_CAP_MASK
;
602 info
.hi_hpet
= hpetp
->hp_which
;
603 info
.hi_timer
= devp
- hpetp
->hp_dev
;
605 memcpy((void *)arg
, &info
, sizeof(info
));
607 if (copy_to_user((void __user
*)arg
, &info
,
613 v
= readq(&timer
->hpet_config
);
614 if ((v
& Tn_PER_INT_CAP_MASK
) == 0) {
618 devp
->hd_flags
|= HPET_PERIODIC
;
621 v
= readq(&timer
->hpet_config
);
622 if ((v
& Tn_PER_INT_CAP_MASK
) == 0) {
626 if (devp
->hd_flags
& HPET_PERIODIC
&&
627 readq(&timer
->hpet_config
) & Tn_TYPE_CNF_MASK
) {
628 v
= readq(&timer
->hpet_config
);
629 v
^= Tn_TYPE_CNF_MASK
;
630 writeq(v
, &timer
->hpet_config
);
632 devp
->hd_flags
&= ~HPET_PERIODIC
;
635 if (!kernel
&& (arg
> hpet_max_freq
) &&
636 !capable(CAP_SYS_RESOURCE
)) {
646 devp
->hd_ireqfreq
= hpet_time_div(hpetp
, arg
);
652 static const struct file_operations hpet_fops
= {
653 .owner
= THIS_MODULE
,
659 .release
= hpet_release
,
660 .fasync
= hpet_fasync
,
664 static int hpet_is_known(struct hpet_data
*hdp
)
668 for (hpetp
= hpets
; hpetp
; hpetp
= hpetp
->hp_next
)
669 if (hpetp
->hp_hpet_phys
== hdp
->hd_phys_address
)
675 static ctl_table hpet_table
[] = {
677 .procname
= "max-user-freq",
678 .data
= &hpet_max_freq
,
679 .maxlen
= sizeof(int),
681 .proc_handler
= proc_dointvec
,
686 static ctl_table hpet_root
[] = {
696 static ctl_table dev_root
[] = {
706 static struct ctl_table_header
*sysctl_header
;
709 * Adjustment for when arming the timer with
710 * initial conditions. That is, main counter
711 * ticks expired before interrupts are enabled.
713 #define TICK_CALIBRATE (1000UL)
715 static unsigned long __hpet_calibrate(struct hpets
*hpetp
)
717 struct hpet_timer __iomem
*timer
= NULL
;
718 unsigned long t
, m
, count
, i
, flags
, start
;
719 struct hpet_dev
*devp
;
721 struct hpet __iomem
*hpet
;
723 for (j
= 0, devp
= hpetp
->hp_dev
; j
< hpetp
->hp_ntimer
; j
++, devp
++)
724 if ((devp
->hd_flags
& HPET_OPEN
) == 0) {
725 timer
= devp
->hd_timer
;
732 hpet
= hpetp
->hp_hpet
;
733 t
= read_counter(&timer
->hpet_compare
);
736 count
= hpet_time_div(hpetp
, TICK_CALIBRATE
);
738 local_irq_save(flags
);
740 start
= read_counter(&hpet
->hpet_mc
);
743 m
= read_counter(&hpet
->hpet_mc
);
744 write_counter(t
+ m
+ hpetp
->hp_delta
, &timer
->hpet_compare
);
745 } while (i
++, (m
- start
) < count
);
747 local_irq_restore(flags
);
749 return (m
- start
) / i
;
752 static unsigned long hpet_calibrate(struct hpets
*hpetp
)
754 unsigned long ret
= -1;
758 * Try to calibrate until return value becomes stable small value.
759 * If SMI interruption occurs in calibration loop, the return value
760 * will be big. This avoids its impact.
763 tmp
= __hpet_calibrate(hpetp
);
772 int hpet_alloc(struct hpet_data
*hdp
)
775 struct hpet_dev
*devp
;
779 struct hpet __iomem
*hpet
;
780 static struct hpets
*last
= NULL
;
781 unsigned long period
;
782 unsigned long long temp
;
786 * hpet_alloc can be called by platform dependent code.
787 * If platform dependent code has allocated the hpet that
788 * ACPI has also reported, then we catch it here.
790 if (hpet_is_known(hdp
)) {
791 printk(KERN_DEBUG
"%s: duplicate HPET ignored\n",
796 siz
= sizeof(struct hpets
) + ((hdp
->hd_nirqs
- 1) *
797 sizeof(struct hpet_dev
));
799 hpetp
= kzalloc(siz
, GFP_KERNEL
);
804 hpetp
->hp_which
= hpet_nhpet
++;
805 hpetp
->hp_hpet
= hdp
->hd_address
;
806 hpetp
->hp_hpet_phys
= hdp
->hd_phys_address
;
808 hpetp
->hp_ntimer
= hdp
->hd_nirqs
;
810 for (i
= 0; i
< hdp
->hd_nirqs
; i
++)
811 hpetp
->hp_dev
[i
].hd_hdwirq
= hdp
->hd_irq
[i
];
813 hpet
= hpetp
->hp_hpet
;
815 cap
= readq(&hpet
->hpet_cap
);
817 ntimer
= ((cap
& HPET_NUM_TIM_CAP_MASK
) >> HPET_NUM_TIM_CAP_SHIFT
) + 1;
819 if (hpetp
->hp_ntimer
!= ntimer
) {
820 printk(KERN_WARNING
"hpet: number irqs doesn't agree"
821 " with number of timers\n");
827 last
->hp_next
= hpetp
;
833 period
= (cap
& HPET_COUNTER_CLK_PERIOD_MASK
) >>
834 HPET_COUNTER_CLK_PERIOD_SHIFT
; /* fs, 10^-15 */
835 temp
= 1000000000000000uLL; /* 10^15 femtoseconds per second */
836 temp
+= period
>> 1; /* round */
837 do_div(temp
, period
);
838 hpetp
->hp_tick_freq
= temp
; /* ticks per second */
840 printk(KERN_INFO
"hpet%d: at MMIO 0x%lx, IRQ%s",
841 hpetp
->hp_which
, hdp
->hd_phys_address
,
842 hpetp
->hp_ntimer
> 1 ? "s" : "");
843 for (i
= 0; i
< hpetp
->hp_ntimer
; i
++)
844 printk("%s %d", i
> 0 ? "," : "", hdp
->hd_irq
[i
]);
847 temp
= hpetp
->hp_tick_freq
;
848 remainder
= do_div(temp
, 1000000);
850 "hpet%u: %u comparators, %d-bit %u.%06u MHz counter\n",
851 hpetp
->hp_which
, hpetp
->hp_ntimer
,
852 cap
& HPET_COUNTER_SIZE_MASK
? 64 : 32,
853 (unsigned) temp
, remainder
);
855 mcfg
= readq(&hpet
->hpet_config
);
856 if ((mcfg
& HPET_ENABLE_CNF_MASK
) == 0) {
857 write_counter(0L, &hpet
->hpet_mc
);
858 mcfg
|= HPET_ENABLE_CNF_MASK
;
859 writeq(mcfg
, &hpet
->hpet_config
);
862 for (i
= 0, devp
= hpetp
->hp_dev
; i
< hpetp
->hp_ntimer
; i
++, devp
++) {
863 struct hpet_timer __iomem
*timer
;
865 timer
= &hpet
->hpet_timers
[devp
- hpetp
->hp_dev
];
867 devp
->hd_hpets
= hpetp
;
868 devp
->hd_hpet
= hpet
;
869 devp
->hd_timer
= timer
;
872 * If the timer was reserved by platform code,
873 * then make timer unavailable for opens.
875 if (hdp
->hd_state
& (1 << i
)) {
876 devp
->hd_flags
= HPET_OPEN
;
880 init_waitqueue_head(&devp
->hd_waitqueue
);
883 hpetp
->hp_delta
= hpet_calibrate(hpetp
);
885 /* This clocksource driver currently only works on ia64 */
887 if (!hpet_clocksource
) {
888 hpet_mctr
= (void __iomem
*)&hpetp
->hp_hpet
->hpet_mc
;
889 CLKSRC_FSYS_MMIO_SET(clocksource_hpet
.fsys_mmio
, hpet_mctr
);
890 clocksource_hpet
.mult
= clocksource_hz2mult(hpetp
->hp_tick_freq
,
891 clocksource_hpet
.shift
);
892 clocksource_register(&clocksource_hpet
);
893 hpetp
->hp_clocksource
= &clocksource_hpet
;
894 hpet_clocksource
= &clocksource_hpet
;
901 static acpi_status
hpet_resources(struct acpi_resource
*res
, void *data
)
903 struct hpet_data
*hdp
;
905 struct acpi_resource_address64 addr
;
909 status
= acpi_resource_to_address64(res
, &addr
);
911 if (ACPI_SUCCESS(status
)) {
912 hdp
->hd_phys_address
= addr
.minimum
;
913 hdp
->hd_address
= ioremap(addr
.minimum
, addr
.address_length
);
915 if (hpet_is_known(hdp
)) {
916 iounmap(hdp
->hd_address
);
917 return AE_ALREADY_EXISTS
;
919 } else if (res
->type
== ACPI_RESOURCE_TYPE_FIXED_MEMORY32
) {
920 struct acpi_resource_fixed_memory32
*fixmem32
;
922 fixmem32
= &res
->data
.fixed_memory32
;
926 hdp
->hd_phys_address
= fixmem32
->address
;
927 hdp
->hd_address
= ioremap(fixmem32
->address
,
930 if (hpet_is_known(hdp
)) {
931 iounmap(hdp
->hd_address
);
932 return AE_ALREADY_EXISTS
;
934 } else if (res
->type
== ACPI_RESOURCE_TYPE_EXTENDED_IRQ
) {
935 struct acpi_resource_extended_irq
*irqp
;
938 irqp
= &res
->data
.extended_irq
;
940 for (i
= 0; i
< irqp
->interrupt_count
; i
++) {
941 irq
= acpi_register_gsi(NULL
, irqp
->interrupts
[i
],
942 irqp
->triggering
, irqp
->polarity
);
946 hdp
->hd_irq
[hdp
->hd_nirqs
] = irq
;
954 static int hpet_acpi_add(struct acpi_device
*device
)
957 struct hpet_data data
;
959 memset(&data
, 0, sizeof(data
));
962 acpi_walk_resources(device
->handle
, METHOD_NAME__CRS
,
963 hpet_resources
, &data
);
965 if (ACPI_FAILURE(result
))
968 if (!data
.hd_address
|| !data
.hd_nirqs
) {
969 printk("%s: no address or irqs in _CRS\n", __func__
);
973 return hpet_alloc(&data
);
976 static int hpet_acpi_remove(struct acpi_device
*device
, int type
)
978 /* XXX need to unregister clocksource, dealloc mem, etc */
982 static const struct acpi_device_id hpet_device_ids
[] = {
986 MODULE_DEVICE_TABLE(acpi
, hpet_device_ids
);
988 static struct acpi_driver hpet_acpi_driver
= {
990 .ids
= hpet_device_ids
,
992 .add
= hpet_acpi_add
,
993 .remove
= hpet_acpi_remove
,
997 static struct miscdevice hpet_misc
= { HPET_MINOR
, "hpet", &hpet_fops
};
999 static int __init
hpet_init(void)
1003 result
= misc_register(&hpet_misc
);
1007 sysctl_header
= register_sysctl_table(dev_root
);
1009 result
= acpi_bus_register_driver(&hpet_acpi_driver
);
1012 unregister_sysctl_table(sysctl_header
);
1013 misc_deregister(&hpet_misc
);
1020 static void __exit
hpet_exit(void)
1022 acpi_bus_unregister_driver(&hpet_acpi_driver
);
1025 unregister_sysctl_table(sysctl_header
);
1026 misc_deregister(&hpet_misc
);
1031 module_init(hpet_init
);
1032 module_exit(hpet_exit
);
1033 MODULE_AUTHOR("Bob Picco <Robert.Picco@hp.com>");
1034 MODULE_LICENSE("GPL");