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