LXR linux/arch/mips/jz4740/timer.c

   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 <asm/mach-jz4740/base.h>
  21#include <asm/mach-jz4740/timer.h>
  22
  23void __iomem *jz4740_timer_base;
  24EXPORT_SYMBOL_GPL(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