projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| a09e64fb | 1 | /* arch/arm/mach-s3c2410/include/mach/system-reset.h |
| 3c7d9c81 BD |
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 | ||
| a09e64fb | 13 | #include <mach/hardware.h> |
| fced80c7 | 14 | #include <linux/io.h> |
| 3c7d9c81 BD |
15 | |
| 16 | #include <asm/plat-s3c/regs-watchdog.h> | |
| a09e64fb | 17 | #include <mach/regs-clock.h> |
| 3c7d9c81 BD |
18 | |
| 19 | #include <linux/clk.h> | |
| 20 | #include <linux/err.h> | |
| 21 | ||
| 22 | extern void (*s3c24xx_reset_hook)(void); | |
| 23 | ||
| 24 | static void | |
| 25 | arch_reset(char mode) | |
| 26 | { | |
| 27 | struct clk *wdtclk; | |
| 28 | ||
| 29 | if (mode == 's') { | |
| 30 | cpu_reset(0); | |
| 31 | } | |
| 32 | ||
| 33 | if (s3c24xx_reset_hook) | |
| 34 | s3c24xx_reset_hook(); | |
| 35 | ||
| 36 | printk("arch_reset: attempting watchdog reset\n"); | |
| 37 | ||
| 38 | __raw_writel(0, S3C2410_WTCON); /* disable watchdog, to be safe */ | |
| 39 | ||
| 40 | wdtclk = clk_get(NULL, "watchdog"); | |
| 41 | if (!IS_ERR(wdtclk)) { | |
| 42 | clk_enable(wdtclk); | |
| 43 | } else | |
| 44 | printk(KERN_WARNING "%s: warning: cannot get watchdog clock\n", __func__); | |
| 45 | ||
| 46 | /* put initial values into count and data */ | |
| 47 | __raw_writel(0x80, S3C2410_WTCNT); | |
| 48 | __raw_writel(0x80, S3C2410_WTDAT); | |
| 49 | ||
| 50 | /* set the watchdog to go and reset... */ | |
| 51 | __raw_writel(S3C2410_WTCON_ENABLE|S3C2410_WTCON_DIV16|S3C2410_WTCON_RSTEN | | |
| 52 | S3C2410_WTCON_PRESCALE(0x20), S3C2410_WTCON); | |
| 53 | ||
| 54 | /* wait for reset to assert... */ | |
| 55 | mdelay(500); | |
| 56 | ||
| 57 | printk(KERN_ERR "Watchdog reset failed to assert reset\n"); | |
| 58 | ||
| 59 | /* delay to allow the serial port to show the message */ | |
| 60 | mdelay(50); | |
| 61 | ||
| 62 | /* we'll take a jump through zero as a poor second */ | |
| 63 | cpu_reset(0); | |
| 64 | } |