Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* linux/include/asm-arm/arch-s3c2410/system.h |
| 2 | * |
| 3 | * (c) 2003 Simtec Electronics |
| 4 | * Ben Dooks <ben@simtec.co.uk> |
| 5 | * |
| 6 | * S3C2410 - System function defines and includes |
| 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. |
Ben Dooks | 3c06cd1 | 2006-09-09 19:44:57 +0100 | [diff] [blame^] | 11 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | |
| 13 | #include <asm/hardware.h> |
| 14 | #include <asm/io.h> |
| 15 | |
| 16 | #include <asm/arch/map.h> |
| 17 | #include <asm/arch/idle.h> |
| 18 | |
| 19 | #include <asm/arch/regs-watchdog.h> |
| 20 | #include <asm/arch/regs-clock.h> |
| 21 | |
| 22 | void (*s3c24xx_idle)(void); |
| 23 | |
| 24 | void s3c24xx_default_idle(void) |
| 25 | { |
| 26 | void __iomem *reg = S3C2410_CLKCON; |
| 27 | unsigned long tmp; |
| 28 | int i; |
| 29 | |
| 30 | /* idle the system by using the idle mode which will wait for an |
| 31 | * interrupt to happen before restarting the system. |
| 32 | */ |
| 33 | |
| 34 | /* Warning: going into idle state upsets jtag scanning */ |
| 35 | |
| 36 | __raw_writel(__raw_readl(reg) | (1<<2), reg); |
| 37 | |
| 38 | /* the samsung port seems to do a loop and then unset idle.. */ |
| 39 | for (i = 0; i < 50; i++) { |
| 40 | tmp += __raw_readl(reg); /* ensure loop not optimised out */ |
| 41 | } |
| 42 | |
| 43 | /* this bit is not cleared on re-start... */ |
| 44 | |
| 45 | __raw_writel(__raw_readl(reg) & ~(1<<2), reg); |
| 46 | } |
| 47 | |
| 48 | static void arch_idle(void) |
| 49 | { |
| 50 | if (s3c24xx_idle != NULL) |
| 51 | (s3c24xx_idle)(); |
| 52 | else |
| 53 | s3c24xx_default_idle(); |
| 54 | } |
| 55 | |
| 56 | |
| 57 | static void |
| 58 | arch_reset(char mode) |
| 59 | { |
| 60 | if (mode == 's') { |
| 61 | cpu_reset(0); |
| 62 | } |
| 63 | |
| 64 | printk("arch_reset: attempting watchdog reset\n"); |
| 65 | |
| 66 | __raw_writel(0, S3C2410_WTCON); /* disable watchdog, to be safe */ |
| 67 | |
| 68 | /* put initial values into count and data */ |
| 69 | __raw_writel(0x100, S3C2410_WTCNT); |
| 70 | __raw_writel(0x100, S3C2410_WTDAT); |
| 71 | |
| 72 | /* set the watchdog to go and reset... */ |
| 73 | __raw_writel(S3C2410_WTCON_ENABLE|S3C2410_WTCON_DIV16|S3C2410_WTCON_RSTEN | |
| 74 | S3C2410_WTCON_PRESCALE(0x80), S3C2410_WTCON); |
| 75 | |
| 76 | /* wait for reset to assert... */ |
| 77 | mdelay(5000); |
| 78 | |
| 79 | printk(KERN_ERR "Watchdog reset failed to assert reset\n"); |
| 80 | |
| 81 | /* we'll take a jump through zero as a poor second */ |
| 82 | cpu_reset(0); |
| 83 | } |