/* linux/include/asm-arm/arch-s3c2410/system.h * * (c) 2003 Simtec Electronics * Ben Dooks <ben@simtec.co.uk> * * S3C2410 - System function defines and includes * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include <asm/hardware.h> #include <asm/io.h> #include <asm/arch/map.h> #include <asm/arch/idle.h> #include <asm/arch/regs-watchdog.h> #include <asm/arch/regs-clock.h> void (*s3c24xx_idle)(void); void s3c24xx_default_idle(void) { void __iomem *reg = S3C2410_CLKCON; unsigned long tmp; int i; /* idle the system by using the idle mode which will wait for an * interrupt to happen before restarting the system. */ /* Warning: going into idle state upsets jtag scanning */ __raw_writel(__raw_readl(reg) | (1<<2), reg); /* the samsung port seems to do a loop and then unset idle.. */ for (i = 0; i < 50; i++) { tmp += __raw_readl(reg); /* ensure loop not optimised out */ } /* this bit is not cleared on re-start... */ __raw_writel(__raw_readl(reg) & ~(1<<2), reg); } static void arch_idle(void) { if (s3c24xx_idle != NULL) (s3c24xx_idle)(); else s3c24xx_default_idle(); } static void arch_reset(char mode) { if (mode == 's') { cpu_reset(0); } printk("arch_reset: attempting watchdog reset\n"); __raw_writel(0, S3C2410_WTCON); /* disable watchdog, to be safe */ /* put initial values into count and data */ __raw_writel(0x100, S3C2410_WTCNT); __raw_writel(0x100, S3C2410_WTDAT); /* set the watchdog to go and reset... */ __raw_writel(S3C2410_WTCON_ENABLE|S3C2410_WTCON_DIV16|S3C2410_WTCON_RSTEN | S3C2410_WTCON_PRESCALE(0x80), S3C2410_WTCON); /* wait for reset to assert... */ mdelay(5000); printk(KERN_ERR "Watchdog reset failed to assert reset\n"); /* we'll take a jump through zero as a poor second */ cpu_reset(0); }