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Date: Fri, 3 Aug 2007 20:26:17 +0100
From: "Adrian McMenamin" <lkmladrian@...il.com>
To: "Paul Mundt" <lethal@...ux-sh.org>,
linuxsh-dev@...ts.sourceforge.net
Cc: linux-kernel@...r.kernel.org, "Andrew Morton" <akpm@...l.org>
Subject: [PATCH] SH: add machine-ops and Dreamcast specific fix-up
(This code is closely modelled on the i386 machine-ops, though
currently the only board specific fixup is for the Dreamcast and so
there is not a separate set of mach fixups.)
This needs to be tested against a wide range of SH boards and would be
good to go in -mm if Paul acks it.
Add machine-ops code to the SH code base, allowing board specific
reboot and halt code. Currently only Dreamcast specific warm reboot
fixup in code.
Signed-off by: Adrian McMenamin <adrian@...en.demon.co.uk>
diff --git a/arch/sh/boards/dreamcast/Makefile
b/arch/sh/boards/dreamcast/Makefile
index e6fcd3d..7b97546 100644
--- a/arch/sh/boards/dreamcast/Makefile
+++ b/arch/sh/boards/dreamcast/Makefile
@@ -2,5 +2,5 @@
# Makefile for the Sega Dreamcast specific parts of the kernel
#
-obj-y := setup.o irq.o rtc.o reboot.o
+obj-y := setup.o irq.o rtc.o
diff --git a/arch/sh/kernel/Makefile b/arch/sh/kernel/Makefile
index bdb30ba..7ab2359 100644
--- a/arch/sh/kernel/Makefile
+++ b/arch/sh/kernel/Makefile
@@ -5,15 +5,11 @@
extra-y := head.o init_task.o vmlinux.lds
obj-y := debugtraps.o io.o io_generic.o irq.o machvec.o process.o ptrace.o \
- semaphore.o setup.o signal.o sys_sh.o syscalls.o \
+ reboot.o semaphore.o setup.o signal.o sys_sh.o syscalls.o \
time.o topology.o traps.o
obj-y += cpu/ timers/
-ifneq ($(CONFIG_SH_DREAMCAST),y)
- obj-y += reboot.o
-endif
-
obj-$(CONFIG_VSYSCALL) += vsyscall/
obj-$(CONFIG_SMP) += smp.o
diff --git a/arch/sh/kernel/machine_kexec.c b/arch/sh/kernel/machine_kexec.c
index 790ed69..201b370 100644
--- a/arch/sh/kernel/machine_kexec.c
+++ b/arch/sh/kernel/machine_kexec.c
@@ -29,9 +29,6 @@ extern const unsigned char relocate_new_kernel[];
extern const unsigned int relocate_new_kernel_size;
extern void *gdb_vbr_vector;
-void machine_shutdown(void)
-{
-}
void machine_crash_shutdown(struct pt_regs *regs)
{
diff --git a/arch/sh/kernel/reboot.c b/arch/sh/kernel/reboot.c
new file mode 100644
index 0000000..c6247ae
--- /dev/null
+++ b/arch/sh/kernel/reboot.c
@@ -0,0 +1,107 @@
+/*
+ * linux/arch/sh/kernel/reboot.c
+ *
+ * Essentially copied from i386 code
+ * and process.c
+ *
+ * Copyright (C) 1995 Linus Torvalds
+ *
+ * SuperH version: Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima
+ * Copyright (C) 2006 Lineo Solutions Inc. support SH4A UBC
+ * Copyright (C) 2002 - 2007 Paul Mundt
+ * Copyright 2007 Adrian McMenamin
+ *
+ * Licensed under the terms of version 2 of GNU GPL
+ */
+
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <asm/io.h>
+#include <asm/reboot.h>
+
+/*
+ * Power off function, if any
+ */
+void (*pm_power_off)(void);
+EXPORT_SYMBOL(pm_power_off);
+
+/* fixups for individual machines -
+ * in i386 this is in a file of its own
+ * but we only have the Dreamcast for now.
+ */
+
+static void mach_reboot_fixups(void)
+{
+ if (mach_is_dreamcast()) {
+ writel(0x00007611, 0xA05F6890);
+ }
+}
+
+static void native_machine_shutdown(void)
+{
+}
+
+static void native_machine_emergency_restart(void)
+{
+ mach_reboot_fixups();
+ /* SR.BL=1 and invoke address error to let CPU reset (manual reset) */
+ asm volatile("ldc %0, sr\n\t"
+ "mov.l @%1, %0" : : "r" (0x10000000), "r" (0x80000001));
+}
+
+static void native_machine_restart(char * __unused)
+{
+ native_machine_shutdown();
+ native_machine_emergency_restart();
+}
+
+static void native_machine_halt(void)
+{
+ local_irq_disable();
+
+ while (1)
+ cpu_sleep();
+}
+
+static void native_machine_power_off(void)
+{
+ if (pm_power_off) {
+ native_machine_shutdown();
+ pm_power_off();
+ }
+}
+
+struct machine_ops machine_ops = {
+ .power_off = native_machine_power_off,
+ .shutdown = native_machine_shutdown,
+ .emergency_restart = native_machine_emergency_restart,
+ .restart = native_machine_restart,
+ .halt = native_machine_halt,
+};
+
+void machine_power_off(void)
+{
+ machine_ops.power_off();
+}
+
+void machine_shutdown(void)
+{
+ machine_ops.shutdown();
+}
+
+void machine_emergency_restart(void)
+{
+ machine_ops.emergency_restart();
+}
+
+void machine_restart(char *cmd)
+{
+ machine_ops.restart(cmd);
+}
+
+void machine_halt(void)
+{
+ machine_ops.halt();
+}
diff --git a/include/asm-sh/emergency-restart.h
b/include/asm-sh/emergency-restart.h
index 108d8c4..d6bec92 100644
--- a/include/asm-sh/emergency-restart.h
+++ b/include/asm-sh/emergency-restart.h
@@ -1,6 +1,6 @@
-#ifndef _ASM_EMERGENCY_RESTART_H
-#define _ASM_EMERGENCY_RESTART_H
+#ifndef _ASM_SH_EMERGENCY_RESTART_H
+#define _ASM_SH_EMERGENCY_RESTART_H
-#include <asm-generic/emergency-restart.h>
+extern void machine_emergency_restart(void);
-#endif /* _ASM_EMERGENCY_RESTART_H */
+#endif /* _ASM_SH_EMERGENCY_RESTART_H */
-
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