1/* arch/arm/plat-s3c/include/plat/watchdog-reset.h 2 * 3 * Copyright (c) 2008 Simtec Electronics 4 * Ben Dooks <ben@simtec.co.uk> 5 * 6 * S3C2410 - System define for arch_reset() function 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11*/ 12 13#include <plat/clock.h> 14#include <plat/regs-watchdog.h> 15#include <mach/map.h> 16 17#include <linux/clk.h> 18#include <linux/err.h> 19#include <linux/io.h> 20#include <linux/delay.h> 21 22static inline void arch_wdt_reset(void) 23{ 24 printk("arch_reset: attempting watchdog reset\n"); 25 26 __raw_writel(0, S3C2410_WTCON); /* disable watchdog, to be safe */ 27 28 if (!IS_ERR(s3c2410_wdtclk)) 29 clk_enable(s3c2410_wdtclk); 30 31 /* put initial values into count and data */ 32 __raw_writel(0x80, S3C2410_WTCNT); 33 __raw_writel(0x80, S3C2410_WTDAT); 34 35 /* set the watchdog to go and reset... */ 36 __raw_writel(S3C2410_WTCON_ENABLE|S3C2410_WTCON_DIV16|S3C2410_WTCON_RSTEN | 37 S3C2410_WTCON_PRESCALE(0x20), S3C2410_WTCON); 38 39 /* wait for reset to assert... */ 40 mdelay(500); 41 42 printk(KERN_ERR "Watchdog reset failed to assert reset\n"); 43 44 /* delay to allow the serial port to show the message */ 45 mdelay(50); 46} 47