73 lines
2.0 KiB
C
73 lines
2.0 KiB
C
/*
|
|
* (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);
|