Ben Dooks | 3c7d9c8 | 2008-04-16 00:15:20 +0100 | [diff] [blame] | 1 | /* linux/include/asm-arm/arch-s3c2410/system-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 | |
Russell King | be50972 | 2008-08-04 10:41:28 +0100 | [diff] [blame] | 13 | #include <asm/arch/hardware.h> |
Ben Dooks | 3c7d9c8 | 2008-04-16 00:15:20 +0100 | [diff] [blame] | 14 | #include <asm/io.h> |
| 15 | |
| 16 | #include <asm/plat-s3c/regs-watchdog.h> |
| 17 | #include <asm/arch/regs-clock.h> |
| 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 | } |