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>
65 lines
1.5 KiB
C
65 lines
1.5 KiB
C
/* linux/include/asm-arm/arch-s3c2410/system-reset.h
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*
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* Copyright (c) 2008 Simtec Electronics
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* Ben Dooks <ben@simtec.co.uk>
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*
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* S3C2410 - System define for arch_reset() function
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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/plat-s3c/regs-watchdog.h>
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#include <asm/arch/regs-clock.h>
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#include <linux/clk.h>
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#include <linux/err.h>
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extern void (*s3c24xx_reset_hook)(void);
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static void
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arch_reset(char mode)
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{
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struct clk *wdtclk;
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if (mode == 's') {
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cpu_reset(0);
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}
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if (s3c24xx_reset_hook)
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s3c24xx_reset_hook();
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printk("arch_reset: attempting watchdog reset\n");
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__raw_writel(0, S3C2410_WTCON); /* disable watchdog, to be safe */
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wdtclk = clk_get(NULL, "watchdog");
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if (!IS_ERR(wdtclk)) {
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clk_enable(wdtclk);
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} else
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printk(KERN_WARNING "%s: warning: cannot get watchdog clock\n", __func__);
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/* put initial values into count and data */
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__raw_writel(0x80, S3C2410_WTCNT);
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__raw_writel(0x80, S3C2410_WTDAT);
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/* set the watchdog to go and reset... */
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__raw_writel(S3C2410_WTCON_ENABLE|S3C2410_WTCON_DIV16|S3C2410_WTCON_RSTEN |
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S3C2410_WTCON_PRESCALE(0x20), S3C2410_WTCON);
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/* wait for reset to assert... */
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mdelay(500);
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printk(KERN_ERR "Watchdog reset failed to assert reset\n");
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/* delay to allow the serial port to show the message */
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mdelay(50);
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/* we'll take a jump through zero as a poor second */
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cpu_reset(0);
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}
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