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Diffstat (limited to 'drivers/watchdog/ftwdt010_wdt.c')
-rw-r--r--drivers/watchdog/ftwdt010_wdt.c102
1 files changed, 102 insertions, 0 deletions
diff --git a/drivers/watchdog/ftwdt010_wdt.c b/drivers/watchdog/ftwdt010_wdt.c
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+++ b/drivers/watchdog/ftwdt010_wdt.c
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+/*
+ * Watchdog driver for the FTWDT010 Watch Dog Driver
+ *
+ * (c) Copyright 2004 Faraday Technology Corp. (www.faraday-tech.com)
+ * Based on sa1100_wdt.c by Oleg Drokin <green@crimea.edu>
+ * Based on SoftDog driver by Alan Cox <alan@redhat.com>
+ *
+ * Copyright (C) 2011 Andes Technology Corporation
+ * Macpaul Lin, Andes Technology Corporation <macpaul@andestech.com>
+ *
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * 27/11/2004 Initial release, Faraday.
+ * 12/01/2011 Port to u-boot, Macpaul Lin.
+ */
+
+#include <common.h>
+#include <watchdog.h>
+#include <asm/io.h>
+#include "ftwdt010_wdt.h"
+
+/*
+ * Set the watchdog time interval.
+ * Counter is 32 bit.
+ */
+static int ftwdt010_wdt_settimeout(unsigned int timeout)
+{
+ unsigned int reg;
+
+ struct ftwdt010_wdt *wd = (struct ftwdt010_wdt *)CONFIG_FTWDT010_BASE;
+
+ debug("Activating WDT..\n");
+
+ /* Check if disabled */
+ if (readl(&wd->wdcr) & ~FTWDT010_WDCR_ENABLE) {
+ printf("sorry, watchdog is disabled\n");
+ return -1;
+ }
+
+ /*
+ * In a 66MHz system,
+ * if you set WDLOAD as 0x03EF1480 (66000000)
+ * the reset timer is 1 second.
+ */
+ reg = FTWDT010_WDLOAD(timeout * FTWDT010_TIMEOUT_FACTOR);
+
+ writel(reg, &wd->wdload);
+
+ return 0;
+}
+
+void ftwdt010_wdt_reset()
+{
+ struct ftwdt010_wdt *wd = (struct ftwdt010_wdt *)CONFIG_FTWDT010_BASE;
+
+ /* clear control register */
+ writel(0, &wd->wdcr);
+
+ /* Write Magic number */
+ writel(FTWDT010_WDRESTART_MAGIC, &wd->wdrestart);
+
+ /* Enable WDT */
+ writel((FTWDT010_WDCR_RST | FTWDT010_WDCR_ENABLE), &wd->wdcr);
+}
+
+void ftwdt010_wdt_disable()
+{
+ struct ftwdt010_wdt *wd = (struct ftwdt010_wdt *)CONFIG_FTWDT010_BASE;
+
+ debug("Deactivating WDT..\n");
+
+ /*
+ * It was defined with CONFIG_WATCHDOG_NOWAYOUT in Linux
+ *
+ * Shut off the timer.
+ * Lock it in if it's a module and we defined ...NOWAYOUT
+ */
+ writel(0, &wd->wdcr);
+}
+
+void hw_watchdog_reset()
+{
+ ftwdt010_wdt_reset();
+}
+
+void hw_watchdog_init(void)
+{
+ /* set timer in ms */
+ ftwdt010_wdt_settimeout(CONFIG_FTWDT010_HW_TIMEOUT * 1000);
+}