blob: bc5e83fb5819edacfc17c1315a16028b3dd4cc8c (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
|
/*
* linux/arch/arm/mach-footbridge/dc21285-timer.c
*
* Copyright (C) 1998 Russell King.
* Copyright (C) 1998 Phil Blundell
*/
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/spinlock.h>
#include <asm/irq.h>
#include <asm/hardware/dec21285.h>
#include <asm/mach/time.h>
#include "common.h"
/*
* Footbridge timer 1 support.
*/
static unsigned long timer1_latch;
static unsigned long timer1_gettimeoffset (void)
{
unsigned long value = timer1_latch - *CSR_TIMER1_VALUE;
return ((tick_nsec / 1000) * value) / timer1_latch;
}
static irqreturn_t
timer1_interrupt(int irq, void *dev_id)
{
*CSR_TIMER1_CLR = 0;
timer_tick();
return IRQ_HANDLED;
}
static struct irqaction footbridge_timer_irq = {
.name = "Timer1 timer tick",
.handler = timer1_interrupt,
.flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
};
/*
* Set up timer interrupt.
*/
static void __init footbridge_timer_init(void)
{
timer1_latch = (mem_fclk_21285 + 8 * HZ) / (16 * HZ);
*CSR_TIMER1_CLR = 0;
*CSR_TIMER1_LOAD = timer1_latch;
*CSR_TIMER1_CNTL = TIMER_CNTL_ENABLE | TIMER_CNTL_AUTORELOAD | TIMER_CNTL_DIV16;
setup_irq(IRQ_TIMER1, &footbridge_timer_irq);
}
struct sys_timer footbridge_timer = {
.init = footbridge_timer_init,
.offset = timer1_gettimeoffset,
};
|
