Root/arch/mips/jz4740/timer.c

Source at commit f35b0e449b9d37aa6a5dd5722036a400acb3e433 created 4 years 7 months ago.
By Lars-Peter Clausen, Add JZ4740 SoC core support
1/*
2 * Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
3 * JZ4740 platform timer support
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; either version 2 of the License, or (at your
8 * option) any later version.
9 *
10 * You should have received a copy of the GNU General Public License along
11 * with this program; if not, write to the Free Software Foundation, Inc.,
12 * 675 Mass Ave, Cambridge, MA 02139, USA.
13 *
14 */
15
16#include <linux/io.h>
17#include <linux/kernel.h>
18#include <linux/module.h>
19
20#include "timer.h"
21
22#include <asm/mach-jz4740/base.h>
23
24void __iomem *jz4740_timer_base;
25
26void jz4740_timer_enable_watchdog(void)
27{
28    writel(BIT(16), jz4740_timer_base + JZ_REG_TIMER_STOP_CLEAR);
29}
30
31void jz4740_timer_disable_watchdog(void)
32{
33    writel(BIT(16), jz4740_timer_base + JZ_REG_TIMER_STOP_SET);
34}
35
36void __init jz4740_timer_init(void)
37{
38    jz4740_timer_base = ioremap(CPHYSADDR(JZ4740_TCU_BASE_ADDR), 0x100);
39
40    if (!jz4740_timer_base)
41        panic("Failed to ioremap timer registers");
42
43    /* Disable all timer clocks except for those used as system timers */
44    writel(0x000100fc, jz4740_timer_base + JZ_REG_TIMER_STOP_SET);
45
46    /* Timer irqs are unmasked by default, mask them */
47    writel(0x00ff00ff, jz4740_timer_base + JZ_REG_TIMER_MASK_SET);
48}
49

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