Commit | Line | Data |
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638b2666 | 1 | /* |
1da177e4 LT |
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 | */ | |
1da177e4 LT |
11 | #include <linux/module.h> |
12 | #include <linux/kernel.h> | |
13 | #include <linux/interrupt.h> | |
c75c625d | 14 | #include <linux/irq.h> |
1da177e4 LT |
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, struct pt_regs *regs) | |
43 | { | |
44 | write_seqlock(&xtime_lock); | |
45 | ||
46 | TIMER_EOI = 0; | |
47 | timer_tick(regs); | |
48 | ||
49 | write_sequnlock(&xtime_lock); | |
50 | ||
51 | return IRQ_HANDLED; | |
52 | } | |
53 | ||
54 | static struct irqaction lh7a40x_timer_irq = { | |
55 | .name = "LHA740x Timer Tick", | |
52e405ea | 56 | .flags = IRQF_DISABLED | IRQF_TIMER, |
09b8b5f8 | 57 | .handler = lh7a40x_timer_interrupt, |
1da177e4 LT |
58 | }; |
59 | ||
638b2666 | 60 | static void __init lh7a40x_timer_init (void) |
1da177e4 LT |
61 | { |
62 | /* Stop/disable all timers */ | |
63 | TIMER_CONTROL1 = 0; | |
64 | TIMER_CONTROL2 = 0; | |
65 | TIMER_CONTROL3 = 0; | |
66 | ||
67 | setup_irq (TIMER_IRQ, &lh7a40x_timer_irq); | |
68 | ||
69 | TIMER_LOAD = TIMER_CONSTANT; | |
70 | TIMER_CONTROL = TIMER_MODE; | |
71 | } | |
72 | ||
73 | struct sys_timer lh7a40x_timer = { | |
74 | .init = &lh7a40x_timer_init, | |
75 | }; |