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[PATCH] Qemu system shutdown support

To: linux-mips@linux-mips.org
Subject: [PATCH] Qemu system shutdown support
From: Thiemo Seufer <ths@networkno.de>
Date: Mon, 15 May 2006 18:25:58 +0100
Cc: ralf@linux-mips.org
Original-recipient: rfc822;linux-mips@linux-mips.org
Sender: linux-mips-bounce@linux-mips.org
User-agent: Mutt/1.5.11+cvs20060403
Support for qemu system shutdown.


Signed-off-by:  Thiemo Seufer <ths@networkno.de>


diff -urpN linux-orig/arch/mips/qemu/Makefile linux-work/arch/mips/qemu/Makefile
--- linux-orig/arch/mips/qemu/Makefile  2006-04-24 12:02:26.000000000 +0100
+++ linux-work/arch/mips/qemu/Makefile  2006-05-15 03:07:31.000000000 +0100
@@ -2,7 +2,7 @@
 # Makefile for Qemu specific kernel interface routines under Linux.
 #
 
-obj-y          = q-firmware.o q-irq.o q-mem.o q-setup.o
+obj-y          = q-firmware.o q-irq.o q-mem.o q-setup.o q-reset.o
 
 obj-$(CONFIG_VT) += q-vga.o
 obj-$(CONFIG_SMP) += q-smp.o
diff -urpN linux-orig/arch/mips/qemu/q-reset.c 
linux-work/arch/mips/qemu/q-reset.c
--- linux-orig/arch/mips/qemu/q-reset.c 1970-01-01 01:00:00.000000000 +0100
+++ linux-work/arch/mips/qemu/q-reset.c 2006-05-15 03:06:44.000000000 +0100
@@ -0,0 +1,34 @@
+#include <linux/config.h>
+
+#include <asm/io.h>
+#include <asm/reboot.h>
+#include <asm/cacheflush.h>
+#include <asm/qemu.h>
+
+static void qemu_machine_restart(char *command)
+{
+        volatile unsigned int *reg = (unsigned int *)QEMU_RESTART_REG;
+
+       set_c0_status(ST0_BEV | ST0_ERL);
+       change_c0_config(CONF_CM_CMASK, CONF_CM_UNCACHED);
+       flush_cache_all();
+       write_c0_wired(0);
+       *reg = 42;
+       while (1)
+               cpu_wait();
+}
+
+static void qemu_machine_halt(void)
+{
+        volatile unsigned int *reg = (unsigned int *)QEMU_HALT_REG;
+
+       *reg = 42;
+       while (1)
+               cpu_wait();
+}
+
+void qemu_reboot_setup(void)
+{
+       _machine_restart = qemu_machine_restart;
+       _machine_halt = qemu_machine_halt;
+}
diff -urpN linux-orig/arch/mips/qemu/q-setup.c 
linux-work/arch/mips/qemu/q-setup.c
--- linux-orig/arch/mips/qemu/q-setup.c 2006-04-24 12:02:26.000000000 +0100
+++ linux-work/arch/mips/qemu/q-setup.c 2006-05-15 03:06:44.000000000 +0100
@@ -3,6 +3,7 @@
 #include <asm/time.h>
 
 extern void qvga_init(void);
+extern void qemu_reboot_setup(void);
 
 #define QEMU_PORT_BASE 0xb4000000
 
@@ -27,4 +28,6 @@ void __init plat_setup(void)
        qvga_init();
 #endif
        board_timer_setup = qemu_timer_setup;
+
+       qemu_reboot_setup();
 }
diff -urpN linux-orig/include/asm-mips/qemu.h linux-work/include/asm-mips/qemu.h
--- linux-orig/include/asm-mips/qemu.h  2006-04-24 12:02:35.000000000 +0100
+++ linux-work/include/asm-mips/qemu.h  2006-05-15 03:06:44.000000000 +0100
@@ -21,4 +21,10 @@
  */
 #define QEMU_C0_COUNTER_CLOCK  100000000
 
+/*
+ * Magic qemu system control location.
+ */
+#define QEMU_RESTART_REG       0xBFBF0000
+#define QEMU_HALT_REG          0xBFBF0004
+
 #endif /* __ASM_QEMU_H */

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