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/*
* (C) Copyright 2012 Juergen Beisert - <kernel@pengutronix.de>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <common.h>
#include <init.h>
#include <io.h>
#include <reset_source.h>
#include <mach/imx-regs.h>
#ifdef CONFIG_ARCH_IMX1
# define IMX_RESET_SRC_WDOG (1 << 1)
# define IMX_RESET_SRC_HRDRESET (1 << 0)
/* let the compiler sort out useless code on this arch */
# define IMX_RESET_SRC_WARMSTART 0
# define IMX_RESET_SRC_COLDSTART 0
#else
/* WRSR checked for i.MX25, i.MX27, i.MX31, i.MX35 and i.MX51 */
# define WDOG_WRSR 0x04
/* valid for i.MX25, i.MX27, i.MX31, i.MX35, i.MX51 */
# define IMX_RESET_SRC_WARMSTART (1 << 0)
/* valid for i.MX25, i.MX27, i.MX31, i.MX35, i.MX51 */
# define IMX_RESET_SRC_WDOG (1 << 1)
/* valid for i.MX27, i.MX31, always '0' on i.MX25, i.MX35, i.MX51 */
# define IMX_RESET_SRC_HRDRESET (1 << 3)
/* valid for i.MX27, i.MX31, always '0' on i.MX25, i.MX35, i.MX51 */
# define IMX_RESET_SRC_COLDSTART (1 << 4)
#endif
static unsigned read_detection_register(void)
{
#ifdef CONFIG_ARCH_IMX1
return readl(IMX_SYSCTRL_BASE);
#else
return readw(IMX_WDT_BASE + WDOG_WRSR);
#endif
}
static int imx_detect_reset_source(void)
{
unsigned reg = read_detection_register();
if (reg & IMX_RESET_SRC_COLDSTART) {
set_reset_source(RESET_POR);
return 0;
}
if (reg & (IMX_RESET_SRC_HRDRESET | IMX_RESET_SRC_WARMSTART)) {
set_reset_source(RESET_RST);
return 0;
}
if (reg & IMX_RESET_SRC_WDOG) {
set_reset_source(RESET_WDG);
return 0;
}
/* else keep the default 'unknown' state */
return 0;
}
device_initcall(imx_detect_reset_source);
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