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} 30EXPORT_SYMBOL_GPL(jz4740_timer_enable_watchdog); 31 32void jz4740_timer_disable_watchdog(void) 33{ 34 writel(BIT(16), jz4740_timer_base + JZ_REG_TIMER_STOP_SET); 35} 36EXPORT_SYMBOL_GPL(jz4740_timer_disable_watchdog); 37 38void __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