1 /* linux/include/asm-arm/arch-s3c2410/system.h
3 * Copyright (c) 2003 Simtec Electronics
4 * Ben Dooks <ben@simtec.co.uk>
6 * S3C2410 - System function defines and includes
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.
13 #include <asm/hardware.h>
16 #include <asm/arch/map.h>
17 #include <asm/arch/idle.h>
19 #include <asm/arch/regs-watchdog.h>
20 #include <asm/arch/regs-clock.h>
22 void (*s3c24xx_idle)(void);
24 void s3c24xx_default_idle(void)
29 /* idle the system by using the idle mode which will wait for an
30 * interrupt to happen before restarting the system.
33 /* Warning: going into idle state upsets jtag scanning */
35 __raw_writel(__raw_readl(S3C2410_CLKCON) | S3C2410_CLKCON_IDLE,
38 /* the samsung port seems to do a loop and then unset idle.. */
39 for (i = 0; i < 50; i++) {
40 tmp += __raw_readl(S3C2410_CLKCON); /* ensure loop not optimised out */
43 /* this bit is not cleared on re-start... */
45 __raw_writel(__raw_readl(S3C2410_CLKCON) & ~S3C2410_CLKCON_IDLE,
49 static void arch_idle(void)
51 if (s3c24xx_idle != NULL)
54 s3c24xx_default_idle();
65 printk("arch_reset: attempting watchdog reset\n");
67 __raw_writel(0, S3C2410_WTCON); /* disable watchdog, to be safe */
69 /* put initial values into count and data */
70 __raw_writel(0x100, S3C2410_WTCNT);
71 __raw_writel(0x100, S3C2410_WTDAT);
73 /* set the watchdog to go and reset... */
74 __raw_writel(S3C2410_WTCON_ENABLE|S3C2410_WTCON_DIV16|S3C2410_WTCON_RSTEN |
75 S3C2410_WTCON_PRESCALE(0x20), S3C2410_WTCON);
77 /* wait for reset to assert... */
80 printk(KERN_ERR "Watchdog reset failed to assert reset\n");
82 /* we'll take a jump through zero as a poor second */