3c7d9c81e1
There seems to be some problem with at-least the S3C2440 and bus traffic during an reset. It is unlikely, but still possible that the system will hang in such a way that the watchdog cannot get the system out of the state it is in. Change to making the code that calls the watchdog reset run from cached memory so that instruction fetches have quiesced before the watchdog fires. Signed-off-by: Ben Dooks <ben-linux@fluff.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
59 lines
1.4 KiB
C
59 lines
1.4 KiB
C
/* linux/include/asm-arm/arch-s3c2410/system.h
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*
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* Copyright (c) 2003 Simtec Electronics
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* Ben Dooks <ben@simtec.co.uk>
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*
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* S3C2410 - System function defines and includes
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <asm/hardware.h>
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#include <asm/io.h>
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#include <asm/arch/map.h>
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#include <asm/arch/idle.h>
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#include <asm/arch/reset.h>
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#include <asm/arch/regs-clock.h>
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void (*s3c24xx_idle)(void);
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void (*s3c24xx_reset_hook)(void);
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void s3c24xx_default_idle(void)
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{
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unsigned long tmp;
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int i;
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/* idle the system by using the idle mode which will wait for an
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* interrupt to happen before restarting the system.
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*/
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/* Warning: going into idle state upsets jtag scanning */
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__raw_writel(__raw_readl(S3C2410_CLKCON) | S3C2410_CLKCON_IDLE,
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S3C2410_CLKCON);
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/* the samsung port seems to do a loop and then unset idle.. */
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for (i = 0; i < 50; i++) {
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tmp += __raw_readl(S3C2410_CLKCON); /* ensure loop not optimised out */
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}
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/* this bit is not cleared on re-start... */
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__raw_writel(__raw_readl(S3C2410_CLKCON) & ~S3C2410_CLKCON_IDLE,
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S3C2410_CLKCON);
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}
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static void arch_idle(void)
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{
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if (s3c24xx_idle != NULL)
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(s3c24xx_idle)();
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else
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s3c24xx_default_idle();
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}
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#include <asm/arch/system-reset.h>
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