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-rw-r--r--arch/arm/mach-imx/system.c70
1 files changed, 70 insertions, 0 deletions
diff --git a/arch/arm/mach-imx/system.c b/arch/arm/mach-imx/system.c
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index 00000000000..695e0d73bf8
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+++ b/arch/arm/mach-imx/system.c
@@ -0,0 +1,70 @@
+/*
+ * Copyright (C) 1999 ARM Limited
+ * Copyright (C) 2000 Deep Blue Solutions Ltd
+ * Copyright 2006-2007 Freescale Semiconductor, Inc. All Rights Reserved.
+ * Copyright 2008 Juergen Beisert, kernel@pengutronix.de
+ * Copyright 2009 Ilya Yanok, Emcraft Systems Ltd, yanok@emcraft.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.
+ */
+
+#include <linux/kernel.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/err.h>
+#include <linux/delay.h>
+
+#include <asm/system_misc.h>
+#include <asm/proc-fns.h>
+#include <asm/mach-types.h>
+
+#include "common.h"
+#include "hardware.h"
+
+static void __iomem *wdog_base;
+
+/*
+ * Reset the system. It is called by machine_restart().
+ */
+void mxc_restart(char mode, const char *cmd)
+{
+ unsigned int wcr_enable;
+
+ if (cpu_is_mx1()) {
+ wcr_enable = (1 << 0);
+ } else {
+ struct clk *clk;
+
+ clk = clk_get_sys("imx2-wdt.0", NULL);
+ if (!IS_ERR(clk))
+ clk_prepare_enable(clk);
+ wcr_enable = (1 << 2);
+ }
+
+ /* Assert SRS signal */
+ __raw_writew(wcr_enable, wdog_base);
+
+ /* wait for reset to assert... */
+ mdelay(500);
+
+ printk(KERN_ERR "Watchdog reset failed to assert reset\n");
+
+ /* delay to allow the serial port to show the message */
+ mdelay(50);
+
+ /* we'll take a jump through zero as a poor second */
+ soft_restart(0);
+}
+
+void mxc_arch_reset_init(void __iomem *base)
+{
+ wdog_base = base;
+}