ff44b49b55
If the watchdog reset fails and we decided to take the jump to zero approach, allow 50ms for the UARTS to drain the FIFOs before calling into a bootloader that may flush the output. Also reduece the waits and the timeout values as 5 seconds is rather long. Signed-off-by: Ben Dooks <ben-linux@fluff.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
102 lines
2.4 KiB
C
102 lines
2.4 KiB
C
/* linux/include/asm-arm/arch-s3c2410/system.h
|
|
*
|
|
* Copyright (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/reset.h>
|
|
|
|
#include <asm/plat-s3c/regs-watchdog.h>
|
|
#include <asm/arch/regs-clock.h>
|
|
|
|
#include <linux/clk.h>
|
|
#include <linux/err.h>
|
|
|
|
void (*s3c24xx_idle)(void);
|
|
void (*s3c24xx_reset_hook)(void);
|
|
|
|
void s3c24xx_default_idle(void)
|
|
{
|
|
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(S3C2410_CLKCON) | S3C2410_CLKCON_IDLE,
|
|
S3C2410_CLKCON);
|
|
|
|
/* the samsung port seems to do a loop and then unset idle.. */
|
|
for (i = 0; i < 50; i++) {
|
|
tmp += __raw_readl(S3C2410_CLKCON); /* ensure loop not optimised out */
|
|
}
|
|
|
|
/* this bit is not cleared on re-start... */
|
|
|
|
__raw_writel(__raw_readl(S3C2410_CLKCON) & ~S3C2410_CLKCON_IDLE,
|
|
S3C2410_CLKCON);
|
|
}
|
|
|
|
static void arch_idle(void)
|
|
{
|
|
if (s3c24xx_idle != NULL)
|
|
(s3c24xx_idle)();
|
|
else
|
|
s3c24xx_default_idle();
|
|
}
|
|
|
|
static void
|
|
arch_reset(char mode)
|
|
{
|
|
struct clk *wdtclk;
|
|
|
|
if (mode == 's') {
|
|
cpu_reset(0);
|
|
}
|
|
|
|
if (s3c24xx_reset_hook)
|
|
s3c24xx_reset_hook();
|
|
|
|
printk("arch_reset: attempting watchdog reset\n");
|
|
|
|
__raw_writel(0, S3C2410_WTCON); /* disable watchdog, to be safe */
|
|
|
|
wdtclk = clk_get(NULL, "watchdog");
|
|
if (!IS_ERR(wdtclk)) {
|
|
clk_enable(wdtclk);
|
|
} else
|
|
printk(KERN_WARNING "%s: warning: cannot get watchdog clock\n", __func__);
|
|
|
|
/* put initial values into count and data */
|
|
__raw_writel(0x80, S3C2410_WTCNT);
|
|
__raw_writel(0x80, S3C2410_WTDAT);
|
|
|
|
/* set the watchdog to go and reset... */
|
|
__raw_writel(S3C2410_WTCON_ENABLE|S3C2410_WTCON_DIV16|S3C2410_WTCON_RSTEN |
|
|
S3C2410_WTCON_PRESCALE(0x20), S3C2410_WTCON);
|
|
|
|
/* wait for reset to assert... */
|
|
mdelay(500);
|
|
|
|
printk(KERN_ERR "Watchdog reset failed to assert reset\n");
|
|
|
|
/* delay to allow the serial port to show the message */
|
|
mdelay(50);
|
|
|
|
/* we'll take a jump through zero as a poor second */
|
|
cpu_reset(0);
|
|
}
|