57 lines
1.5 KiB
C
57 lines
1.5 KiB
C
/*
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* (C) Copyright 2012 Juergen Beisert - <kernel@pengutronix.de>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <common.h>
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#include <init.h>
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#include <io.h>
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#include <reset_source.h>
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#include <mach/s3c-iomap.h>
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/* S3C2440 relevant */
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#define S3C2440_GSTATUS2 0xb4
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# define S3C2440_GSTATUS2_PWRST (1 << 0)
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# define S3C2440_GSTATUS2_SLEEPRST (1 << 1)
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# define S3C2440_GSTATUS2_WDRST (1 << 2)
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static int s3c_detect_reset_source(void)
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{
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u32 reg = readl(S3C_GPIO_BASE + S3C2440_GSTATUS2);
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if (reg & S3C2440_GSTATUS2_PWRST) {
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reset_source_set(RESET_POR);
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writel(S3C2440_GSTATUS2_PWRST,
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S3C_GPIO_BASE + S3C2440_GSTATUS2);
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return 0;
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}
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if (reg & S3C2440_GSTATUS2_SLEEPRST) {
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reset_source_set(RESET_WKE);
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writel(S3C2440_GSTATUS2_SLEEPRST,
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S3C_GPIO_BASE + S3C2440_GSTATUS2);
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return 0;
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}
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if (reg & S3C2440_GSTATUS2_WDRST) {
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reset_source_set(RESET_WDG);
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writel(S3C2440_GSTATUS2_WDRST,
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S3C_GPIO_BASE + S3C2440_GSTATUS2);
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return 0;
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}
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/* else keep the default 'unknown' state */
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return 0;
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}
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device_initcall(s3c_detect_reset_source);
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