From fbb82b03653cdb7fd1863b911e7540011259d2ce Mon Sep 17 00:00:00 2001
From: Paul Mundt <lethal@linux-sh.org>
Date: Wed, 20 Jan 2010 16:42:52 +0900
Subject: sh: machine_ops based reboot support.

This provides a machine_ops-based reboot interface loosely cloned from
x86, and converts the native sh32 and sh64 cases over to it.

Necessary both for tying in SMP support and also enabling platforms like
SDK7786 to add support for their microcontroller-based power managers.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
---
 arch/sh/kernel/reboot.c | 98 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 98 insertions(+)
 create mode 100644 arch/sh/kernel/reboot.c

(limited to 'arch/sh/kernel/reboot.c')

diff --git a/arch/sh/kernel/reboot.c b/arch/sh/kernel/reboot.c
new file mode 100644
index 000000000000..b1fca66bb92e
--- /dev/null
+++ b/arch/sh/kernel/reboot.c
@@ -0,0 +1,98 @@
+#include <linux/pm.h>
+#include <linux/kexec.h>
+#include <linux/kernel.h>
+#include <linux/reboot.h>
+#include <linux/module.h>
+#ifdef CONFIG_SUPERH32
+#include <asm/watchdog.h>
+#endif
+#include <asm/addrspace.h>
+#include <asm/reboot.h>
+#include <asm/system.h>
+
+void (*pm_power_off)(void);
+EXPORT_SYMBOL(pm_power_off);
+
+#ifdef CONFIG_SUPERH32
+static void watchdog_trigger_immediate(void)
+{
+	sh_wdt_write_cnt(0xFF);
+	sh_wdt_write_csr(0xC2);
+}
+#endif
+
+static void native_machine_restart(char * __unused)
+{
+	local_irq_disable();
+
+	/* Address error with SR.BL=1 first. */
+	trigger_address_error();
+
+#ifdef CONFIG_SUPERH32
+	/* If that fails or is unsupported, go for the watchdog next. */
+	watchdog_trigger_immediate();
+#endif
+
+	/*
+	 * Give up and sleep.
+	 */
+	while (1)
+		cpu_sleep();
+}
+
+static void native_machine_shutdown(void)
+{
+	smp_send_stop();
+}
+
+static void native_machine_power_off(void)
+{
+	if (pm_power_off)
+		pm_power_off();
+}
+
+static void native_machine_halt(void)
+{
+	/* stop other cpus */
+	machine_shutdown();
+
+	/* stop this cpu */
+	stop_this_cpu(NULL);
+}
+
+struct machine_ops machine_ops = {
+	.power_off	= native_machine_power_off,
+	.shutdown	= native_machine_shutdown,
+	.restart	= native_machine_restart,
+	.halt		= native_machine_halt,
+#ifdef CONFIG_KEXEC
+	.crash_shutdown = native_machine_crash_shutdown,
+#endif
+};
+
+void machine_power_off(void)
+{
+	machine_ops.power_off();
+}
+
+void machine_shutdown(void)
+{
+	machine_ops.shutdown();
+}
+
+void machine_restart(char *cmd)
+{
+	machine_ops.restart(cmd);
+}
+
+void machine_halt(void)
+{
+	machine_ops.halt();
+}
+
+#ifdef CONFIG_KEXEC
+void machine_crash_shutdown(struct pt_regs *regs)
+{
+	machine_ops.crash_shutdown(regs);
+}
+#endif
-- 
cgit v1.2.1