| Ben Dooks | 3cba5ef | 2009-05-17 23:30:45 +0100 | [diff] [blame] | 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 | |
| Marek Szyprowski | caf2730 | 2011-09-05 20:10:06 +0900 | [diff] [blame] | 13 | #include <plat/clock.h> |
| Ben Dooks | 3cba5ef | 2009-05-17 23:30:45 +0100 | [diff] [blame] | 14 | #include <plat/regs-watchdog.h> |
| Ben Dooks | 543899f | 2009-05-17 23:40:30 +0100 | [diff] [blame] | 15 | #include <mach/map.h> |
| Ben Dooks | 3cba5ef | 2009-05-17 23:30:45 +0100 | [diff] [blame] | 16 | |
| 17 | #include <linux/clk.h> |
| 18 | #include <linux/err.h> |
| 19 | #include <linux/io.h> |
| 20 | |
| 21 | static inline void arch_wdt_reset(void) |
| 22 | { |
| Ben Dooks | 3cba5ef | 2009-05-17 23:30:45 +0100 | [diff] [blame] | 23 | printk("arch_reset: attempting watchdog reset\n"); |
| 24 | |
| 25 | __raw_writel(0, S3C2410_WTCON); /* disable watchdog, to be safe */ |
| 26 | |
| Marek Szyprowski | caf2730 | 2011-09-05 20:10:06 +0900 | [diff] [blame] | 27 | if (s3c2410_wdtclk) |
| 28 | clk_enable(s3c2410_wdtclk); |
| Ben Dooks | 3cba5ef | 2009-05-17 23:30:45 +0100 | [diff] [blame] | 29 | |
| 30 | /* put initial values into count and data */ |
| 31 | __raw_writel(0x80, S3C2410_WTCNT); |
| 32 | __raw_writel(0x80, S3C2410_WTDAT); |
| 33 | |
| 34 | /* set the watchdog to go and reset... */ |
| 35 | __raw_writel(S3C2410_WTCON_ENABLE|S3C2410_WTCON_DIV16|S3C2410_WTCON_RSTEN | |
| 36 | S3C2410_WTCON_PRESCALE(0x20), S3C2410_WTCON); |
| 37 | |
| 38 | /* wait for reset to assert... */ |
| 39 | mdelay(500); |
| 40 | |
| 41 | printk(KERN_ERR "Watchdog reset failed to assert reset\n"); |
| 42 | |
| 43 | /* delay to allow the serial port to show the message */ |
| 44 | mdelay(50); |
| 45 | } |