MIPS: Attach goldfish machine reset and power-off routines

If "reboot" or "reboot -p" are requested from the emulator, these
routines will be triggered which in return should reset or power-off the
machine.

This simple power management device is mapped at 0x1f007000 address.
It contains only one register, which holds commands to be performed.
    GORESET: 0x42 command for reboot
    GOPOWEROFF: 0x43 command for shutdown

Change-Id: I73654a7cc6e8ffbac4b3867561ba713892440328
Signed-off-by: Goran Ferenc <goran.ferenc@imgtec.com>

arch/mips/goldfish/Makefile

@@ -6,5 +6,6 @@ obj-y += goldfish-platform.o goldfish-interrupt.o
 obj-y += goldfish-time.o
 obj-y += pdev_bus.o
 obj-y += switch.o pm.o
+obj-y += goldfish-reset.o
 
 #EXTRA_CFLAGS += -Werror

arch/mips/goldfish/goldfish-reset.c

+/* arch/mips/goldfish/goldfish-reset.c
+ *
+ * Goldfish Machine Reset Routines
+ *
+ * Copyright (C) 2007 Google, Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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/init.h>
+#include <linux/pm.h>
+
+#include <asm/io.h>
+#include <asm/reboot.h>
+#include <asm/mips-boards/generic.h>
+
+#define GOLDFISH_RESET      0x1f007000
+#define GOSHUTDOWN          0x43
+
+unsigned int __iomem *softres_reg;
+
+static void mips_machine_restart(char *command)
+{
+	__raw_writel(GORESET, softres_reg);
+}
+
+static void mips_machine_halt(void)
+{
+	__raw_writel(GOSHUTDOWN, softres_reg);
+}
+
+static int __init mips_reboot_setup(void)
+{
+	softres_reg = ioremap(GOLDFISH_RESET, sizeof(unsigned int));
+
+	_machine_restart = mips_machine_restart;
+	_machine_halt = mips_machine_halt;
+	pm_power_off = mips_machine_halt;
+
+	return 0;
+}
+
+arch_initcall(mips_reboot_setup);