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authorIlya Yanok <yanok@emcraft.com>2009-03-03 02:49:23 +0300
committerSascha Hauer <s.hauer@pengutronix.de>2009-03-27 14:51:14 +0100
commit74bef9a4fa978669b234c4454daa596c0494c09a (patch)
tree4c08bfcfb3e59889143491837991d7cf521fed72 /arch/arm/plat-mxc/system.c
parent05fd8e73e1357feaea9c48938d937eae76b4aef4 (diff)
mxc: add arch_reset() function
This patch adds arch_reset() function for all mxc platforms. It also removes (unsused) arch/arm/mach-mx2/system.c file. This patch has been tested on i.MX1/27/31/35 Signed-off-by: Ilya Yanok <yanok@emcraft.com> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'arch/arm/plat-mxc/system.c')
-rw-r--r--arch/arm/plat-mxc/system.c67
1 files changed, 67 insertions, 0 deletions
diff --git a/arch/arm/plat-mxc/system.c b/arch/arm/plat-mxc/system.c
new file mode 100644
index 00000000000..79c37577c91
--- /dev/null
+++ b/arch/arm/plat-mxc/system.c
@@ -0,0 +1,67 @@
+/*
+ * 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.
+ *
+ * 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 <linux/kernel.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/err.h>
+#include <linux/delay.h>
+
+#include <mach/hardware.h>
+#include <asm/proc-fns.h>
+#include <asm/system.h>
+
+#ifdef CONFIG_ARCH_MX1
+#define WDOG_WCR_REG IO_ADDRESS(WDT_BASE_ADDR)
+#define WDOG_WCR_ENABLE (1 << 0)
+#else
+#define WDOG_WCR_REG IO_ADDRESS(WDOG_BASE_ADDR)
+#define WDOG_WCR_ENABLE (1 << 2)
+#endif
+
+/*
+ * Reset the system. It is called by machine_restart().
+ */
+void arch_reset(char mode, const char *cmd)
+{
+ if (!cpu_is_mx1()) {
+ struct clk *clk;
+
+ clk = clk_get_sys("imx-wdt.0", NULL);
+ if (!IS_ERR(clk))
+ clk_enable(clk);
+ }
+
+ /* Assert SRS signal */
+ __raw_writew(WDOG_WCR_ENABLE, WDOG_WCR_REG);
+
+ /* 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 */
+ cpu_reset(0);
+}