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
24 void __iomem *jz4740_timer_base;
25
jz4740_timer_enable_watchdog(void)26 void jz4740_timer_enable_watchdog(void)
27 {
28 writel(BIT(16), jz4740_timer_base + JZ_REG_TIMER_STOP_CLEAR);
29 }
30 EXPORT_SYMBOL_GPL(jz4740_timer_enable_watchdog);
31
jz4740_timer_disable_watchdog(void)32 void jz4740_timer_disable_watchdog(void)
33 {
34 writel(BIT(16), jz4740_timer_base + JZ_REG_TIMER_STOP_SET);
35 }
36 EXPORT_SYMBOL_GPL(jz4740_timer_disable_watchdog);
37
jz4740_timer_init(void)38 void __init jz4740_timer_init(void)
39 {
40 jz4740_timer_base = ioremap(JZ4740_TCU_BASE_ADDR, 0x100);
41
42 if (!jz4740_timer_base)
43 panic("Failed to ioremap timer registers");
44
45 /* Disable all timer clocks except for those used as system timers */
46 writel(0x000100fc, jz4740_timer_base + JZ_REG_TIMER_STOP_SET);
47
48 /* Timer irqs are unmasked by default, mask them */
49 writel(0x00ff00ff, jz4740_timer_base + JZ_REG_TIMER_MASK_SET);
50 }
51