7ec80ddf |
1 | /* |
2 | * linux/arch/arm/mach-w90x900/time.c |
3 | * |
4 | * Based on linux/arch/arm/plat-s3c24xx/time.c by Ben Dooks |
5 | * |
6 | * Copyright (c) 2008 Nuvoton technology corporation |
7 | * All rights reserved. |
8 | * |
9 | * Wan ZongShun <mcuos.com@gmail.com> |
10 | * |
11 | * This program is free software; you can redistribute it and/or modify |
12 | * it under the terms of the GNU General Public License as published by |
13 | * the Free Software Foundation; either version 2 of the License, or |
14 | * (at your option) any later version. |
15 | * |
16 | */ |
17 | |
18 | #include <linux/kernel.h> |
19 | #include <linux/sched.h> |
20 | #include <linux/init.h> |
21 | #include <linux/interrupt.h> |
22 | #include <linux/err.h> |
23 | #include <linux/clk.h> |
24 | #include <linux/io.h> |
25 | #include <linux/leds.h> |
26 | |
27 | #include <asm/mach-types.h> |
28 | #include <asm/mach/irq.h> |
29 | #include <asm/mach/time.h> |
30 | |
7ec80ddf |
31 | #include <mach/map.h> |
32 | #include <mach/regs-timer.h> |
33 | |
34 | static unsigned long w90x900_gettimeoffset(void) |
35 | { |
36 | return 0; |
37 | } |
38 | |
39 | /*IRQ handler for the timer*/ |
40 | |
41 | static irqreturn_t |
42 | w90x900_timer_interrupt(int irq, void *dev_id) |
43 | { |
44 | timer_tick(); |
45 | __raw_writel(0x01, REG_TISR); /* clear TIF0 */ |
46 | return IRQ_HANDLED; |
47 | } |
48 | |
49 | static struct irqaction w90x900_timer_irq = { |
50 | .name = "w90x900 Timer Tick", |
51 | .flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL, |
52 | .handler = w90x900_timer_interrupt, |
53 | }; |
54 | |
55 | /*Set up timer reg.*/ |
56 | |
57 | static void w90x900_timer_setup(void) |
58 | { |
59 | __raw_writel(0, REG_TCSR0); |
60 | __raw_writel(0, REG_TCSR1); |
61 | __raw_writel(0, REG_TCSR2); |
62 | __raw_writel(0, REG_TCSR3); |
63 | __raw_writel(0, REG_TCSR4); |
64 | __raw_writel(0x1F, REG_TISR); |
65 | __raw_writel(15000000/(100 * 100), REG_TICR0); |
66 | __raw_writel(0x68000063, REG_TCSR0); |
67 | } |
68 | |
69 | static void __init w90x900_timer_init(void) |
70 | { |
71 | w90x900_timer_setup(); |
72 | setup_irq(IRQ_TIMER0, &w90x900_timer_irq); |
73 | } |
74 | |
75 | struct sys_timer w90x900_timer = { |
76 | .init = w90x900_timer_init, |
77 | .offset = w90x900_gettimeoffset, |
78 | .resume = w90x900_timer_setup |
79 | }; |