MIPS: ralink: adds reset code

Resetting these SoCs requires no real magic. The code is straight forward.
Signed-off-by: NJohn Crispin <blogic@openwrt.org>
Signed-off-by: NGabor Juhos <juhosg@openwrt.org>
Patchwork: http://patchwork.linux-mips.org/patch/4891/

arch/mips/ralink/reset.c

+/*
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ *
+ * Copyright (C) 2008-2009 Gabor Juhos <juhosg@openwrt.org>
+ * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
+ * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
+ */
+
+#include <linux/pm.h>
+#include <linux/io.h>
+
+#include <asm/reboot.h>
+
+#include <asm/mach-ralink/ralink_regs.h>
+
+/* Reset Control */
+#define SYSC_REG_RESET_CTRL     0x034
+#define RSTCTL_RESET_SYSTEM     BIT(0)
+
+static void ralink_restart(char *command)
+{
+	local_irq_disable();
+	rt_sysc_w32(RSTCTL_RESET_SYSTEM, SYSC_REG_RESET_CTRL);
+	unreachable();
+}
+
+static void ralink_halt(void)
+{
+	local_irq_disable();
+	unreachable();
+}
+
+static int __init mips_reboot_setup(void)
+{
+	_machine_restart = ralink_restart;
+	_machine_halt = ralink_halt;
+	pm_power_off = ralink_halt;
+
+	return 0;
+}
+
+arch_initcall(mips_reboot_setup);