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92 lines
2 KiB
C
92 lines
2 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Watchdog driver for the FTWDT010 Watch Dog Driver
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*
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* (c) Copyright 2004 Faraday Technology Corp. (www.faraday-tech.com)
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* Based on sa1100_wdt.c by Oleg Drokin <green@crimea.edu>
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* Based on SoftDog driver by Alan Cox <alan@redhat.com>
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*
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* Copyright (C) 2011 Andes Technology Corporation
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* Macpaul Lin, Andes Technology Corporation <macpaul@andestech.com>
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*
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* 27/11/2004 Initial release, Faraday.
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* 12/01/2011 Port to u-boot, Macpaul Lin.
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*/
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#include <common.h>
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#include <log.h>
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#include <watchdog.h>
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#include <asm/io.h>
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#include <faraday/ftwdt010_wdt.h>
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/*
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* Set the watchdog time interval.
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* Counter is 32 bit.
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*/
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int ftwdt010_wdt_settimeout(unsigned int timeout)
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{
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unsigned int reg;
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struct ftwdt010_wdt *wd = (struct ftwdt010_wdt *)CONFIG_FTWDT010_BASE;
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debug("Activating WDT..\n");
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/* Check if disabled */
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if (readl(&wd->wdcr) & ~FTWDT010_WDCR_ENABLE) {
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printf("sorry, watchdog is disabled\n");
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return -1;
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}
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/*
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* In a 66MHz system,
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* if you set WDLOAD as 0x03EF1480 (66000000)
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* the reset timer is 1 second.
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*/
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reg = FTWDT010_WDLOAD(timeout * FTWDT010_TIMEOUT_FACTOR);
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writel(reg, &wd->wdload);
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return 0;
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}
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void ftwdt010_wdt_reset(void)
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{
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struct ftwdt010_wdt *wd = (struct ftwdt010_wdt *)CONFIG_FTWDT010_BASE;
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/* clear control register */
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writel(0, &wd->wdcr);
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/* Write Magic number */
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writel(FTWDT010_WDRESTART_MAGIC, &wd->wdrestart);
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/* Enable WDT */
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writel((FTWDT010_WDCR_RST | FTWDT010_WDCR_ENABLE), &wd->wdcr);
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}
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void ftwdt010_wdt_disable(void)
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{
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struct ftwdt010_wdt *wd = (struct ftwdt010_wdt *)CONFIG_FTWDT010_BASE;
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debug("Deactivating WDT..\n");
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/*
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* It was defined with CONFIG_WATCHDOG_NOWAYOUT in Linux
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*
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* Shut off the timer.
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* Lock it in if it's a module and we defined ...NOWAYOUT
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*/
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writel(0, &wd->wdcr);
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}
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#if defined(CONFIG_HW_WATCHDOG)
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void hw_watchdog_reset(void)
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{
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ftwdt010_wdt_reset();
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}
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void hw_watchdog_init(void)
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{
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/* set timer in ms */
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ftwdt010_wdt_settimeout(CONFIG_FTWDT010_HW_TIMEOUT * 1000);
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}
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#endif
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