projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 3cba5ef8 BD |
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> | |
| 543899f6 | 14 | #include <mach/map.h> |
| 3cba5ef8 BD |
15 | |
| 16 | #include <linux/clk.h> | |
| 17 | #include <linux/err.h> | |
| 18 | #include <linux/io.h> | |
| 19 | ||
| 20 | static 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 | } |