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/*
* (C) Copyright 2010 Juergen Beisert - Pengutronix
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <common.h>
#include <init.h>
#include <notifier.h>
#include <mach/imx-regs.h>
#include <asm/io.h>
#define HW_RTC_CTRL 0x000
# define BM_RTC_CTRL_WATCHDOGEN (1 << 4)
#define HW_RTC_CTRL_SET 0x004
#define HW_RTC_CTRL_CLR 0x008
#define HW_RTC_CTRL_TOG 0x00C
#define HW_RTC_WATCHDOG 0x050
#define HW_RTC_WATCHDOG_SET 0x054
#define HW_RTC_WATCHDOG_CLR 0x058
#define HW_RTC_WATCHDOG_TOG 0x05C
#define WDOG_COUNTER_RATE 1000 /* 1 kHz clock */
#define HW_RTC_PERSISTENT1 0x070
# define BV_RTC_PERSISTENT1_GENERAL__RTC_FORCE_UPDATER 0x80000000
#define HW_RTC_PERSISTENT1_SET 0x074
#define HW_RTC_PERSISTENT1_CLR 0x078
#define HW_RTC_PERSISTENT1_TOG 0x07C
/*
* Reset the cpu by setting up the watchdog timer and let it time out
*
* TODO There is a much easier way to reset the CPU: Refer bit 2 in
* the HW_CLKCTRL_RESET register, data sheet page 106/4-30
*/
void __noreturn reset_cpu (unsigned long ignored)
{
writel(WDOG_COUNTER_RATE, IMX_WDT_BASE + HW_RTC_WATCHDOG);
writel(BM_RTC_CTRL_WATCHDOGEN, IMX_WDT_BASE + HW_RTC_CTRL_SET);
writel(BV_RTC_PERSISTENT1_GENERAL__RTC_FORCE_UPDATER, IMX_WDT_BASE + HW_RTC_PERSISTENT1);
while (1)
;
/*NOTREACHED*/
}
EXPORT_SYMBOL(reset_cpu);
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