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/regs-watchdog.h> 14 #include <mach/map.h> 15 16 #include <linux/clk.h> 17 #include <linux/err.h> 18 #include <linux/io.h> 19 arch_wdt_reset(void)20static inline void arch_wdt_reset(void) 21 { 22 struct clk *wdtclk; 23 24 printk("arch_reset: attempting watchdog reset\n"); 25 26 __raw_writel(0, S3C2410_WTCON); /* disable watchdog, to be safe */ 27 28 wdtclk = clk_get(NULL, "watchdog"); 29 if (!IS_ERR(wdtclk)) { 30 clk_enable(wdtclk); 31 } else 32 printk(KERN_WARNING "%s: warning: cannot get watchdog clock\n", __func__); 33 34 /* put initial values into count and data */ 35 __raw_writel(0x80, S3C2410_WTCNT); 36 __raw_writel(0x80, S3C2410_WTDAT); 37 38 /* set the watchdog to go and reset... */ 39 __raw_writel(S3C2410_WTCON_ENABLE|S3C2410_WTCON_DIV16|S3C2410_WTCON_RSTEN | 40 S3C2410_WTCON_PRESCALE(0x20), S3C2410_WTCON); 41 42 /* wait for reset to assert... */ 43 mdelay(500); 44 45 printk(KERN_ERR "Watchdog reset failed to assert reset\n"); 46 47 /* delay to allow the serial port to show the message */ 48 mdelay(50); 49 } 50