1 /*
2 * arch/arm/mach-lh7a40x/time.c
3 *
4 * Copyright (C) 2004 Logic Product Development
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * version 2 as published by the Free Software Foundation.
9 *
10 */
11 #include <linux/module.h>
12 #include <linux/kernel.h>
13 #include <linux/interrupt.h>
14 #include <linux/irq.h>
15 #include <linux/time.h>
16
17 #include <asm/hardware.h>
18 #include <asm/io.h>
19 #include <asm/irq.h>
20 #include <asm/leds.h>
21
22 #include <asm/mach/time.h>
23 #include "common.h"
24
25 #if HZ < 100
26 # define TIMER_CONTROL TIMER_CONTROL2
27 # define TIMER_LOAD TIMER_LOAD2
28 # define TIMER_CONSTANT (508469/HZ)
29 # define TIMER_MODE (TIMER_C_ENABLE | TIMER_C_PERIODIC | TIMER_C_508KHZ)
30 # define TIMER_EOI TIMER_EOI2
31 # define TIMER_IRQ IRQ_T2UI
32 #else
33 # define TIMER_CONTROL TIMER_CONTROL3
34 # define TIMER_LOAD TIMER_LOAD3
35 # define TIMER_CONSTANT (3686400/HZ)
36 # define TIMER_MODE (TIMER_C_ENABLE | TIMER_C_PERIODIC)
37 # define TIMER_EOI TIMER_EOI3
38 # define TIMER_IRQ IRQ_T3UI
39 #endif
40
41 static irqreturn_t
42 lh7a40x_timer_interrupt(int irq, void *dev_id)
43 {
44 TIMER_EOI = 0;
45 timer_tick();
46
47 return IRQ_HANDLED;
48 }
49
50 static struct irqaction lh7a40x_timer_irq = {
51 .name = "LHA740x Timer Tick",
52 .flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
53 .handler = lh7a40x_timer_interrupt,
54 };
55
56 static void __init lh7a40x_timer_init (void)
57 {
58 /* Stop/disable all timers */
59 TIMER_CONTROL1 = 0;
60 TIMER_CONTROL2 = 0;
61 TIMER_CONTROL3 = 0;
62
63 setup_irq (TIMER_IRQ, &lh7a40x_timer_irq);
64
65 TIMER_LOAD = TIMER_CONSTANT;
66 TIMER_CONTROL = TIMER_MODE;
67 }
68
69 struct sys_timer lh7a40x_timer = {
70 .init = &lh7a40x_timer_init,
71 };
72
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