blob: 14de4e596f87b170661faad4cabe21deeb7019aa [file] [log] [blame]
/* linux/include/asm-arm/arch-s3c2410/system.h
* Copyright (c) 2003 Simtec Electronics
* Ben Dooks <>
* S3C2410 - System function defines and includes
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
#include <asm/hardware.h>
#include <asm/io.h>
#include <asm/arch/map.h>
#include <asm/arch/idle.h>
#include <asm/arch/reset.h>
#include <asm/plat-s3c/regs-watchdog.h>
#include <asm/arch/regs-clock.h>
#include <linux/clk.h>
#include <linux/err.h>
void (*s3c24xx_idle)(void);
void (*s3c24xx_reset_hook)(void);
void s3c24xx_default_idle(void)
unsigned long tmp;
int i;
/* idle the system by using the idle mode which will wait for an
* interrupt to happen before restarting the system.
/* Warning: going into idle state upsets jtag scanning */
__raw_writel(__raw_readl(S3C2410_CLKCON) | S3C2410_CLKCON_IDLE,
/* the samsung port seems to do a loop and then unset idle.. */
for (i = 0; i < 50; i++) {
tmp += __raw_readl(S3C2410_CLKCON); /* ensure loop not optimised out */
/* this bit is not cleared on re-start... */
__raw_writel(__raw_readl(S3C2410_CLKCON) & ~S3C2410_CLKCON_IDLE,
static void arch_idle(void)
if (s3c24xx_idle != NULL)
static void
arch_reset(char mode)
struct clk *wdtclk;
if (mode == 's') {
if (s3c24xx_reset_hook)
printk("arch_reset: attempting watchdog reset\n");
__raw_writel(0, S3C2410_WTCON); /* disable watchdog, to be safe */
wdtclk = clk_get(NULL, "watchdog");
if (!IS_ERR(wdtclk)) {
} else
printk(KERN_WARNING "%s: warning: cannot get watchdog clock\n", __func__);
/* put initial values into count and data */
__raw_writel(0x80, S3C2410_WTCNT);
__raw_writel(0x80, S3C2410_WTDAT);
/* set the watchdog to go and reset... */
__raw_writel(S3C2410_WTCON_ENABLE|S3C2410_WTCON_DIV16|S3C2410_WTCON_RSTEN |
S3C2410_WTCON_PRESCALE(0x20), S3C2410_WTCON);
/* wait for reset to assert... */
printk(KERN_ERR "Watchdog reset failed to assert reset\n");
/* delay to allow the serial port to show the message */
/* we'll take a jump through zero as a poor second */