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authorThiemo Seufer <ths@networkno.de>2006-05-15 18:59:34 +0100
committerRalf Baechle <ralf@linux-mips.org>2006-06-19 17:39:19 +0100
commitc583122c26ad04bb2379933dc5acc8b9479d6c67 (patch)
tree8afc9153e18b300ab93ff6a675e0c0f6e464c518
parenteae89076e696f51762d81d6e2538c3beb59fa7bd (diff)
downloadop-kernel-dev-c583122c26ad04bb2379933dc5acc8b9479d6c67.zip
op-kernel-dev-c583122c26ad04bb2379933dc5acc8b9479d6c67.tar.gz
[MIPS] Qemu system shutdown support
Signed-off-by: Thiemo Seufer <ths@networkno.de> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
-rw-r--r--arch/mips/qemu/Makefile2
-rw-r--r--arch/mips/qemu/q-reset.c34
-rw-r--r--arch/mips/qemu/q-setup.c4
-rw-r--r--include/asm-mips/qemu.h6
4 files changed, 45 insertions, 1 deletions
diff --git a/arch/mips/qemu/Makefile b/arch/mips/qemu/Makefile
index 730f459..078cd30 100644
--- a/arch/mips/qemu/Makefile
+++ b/arch/mips/qemu/Makefile
@@ -2,6 +2,6 @@
# 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_SMP) += q-smp.o
diff --git a/arch/mips/qemu/q-reset.c b/arch/mips/qemu/q-reset.c
new file mode 100644
index 0000000..c04ebcf
--- /dev/null
+++ b/arch/mips/qemu/q-reset.c
@@ -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 --git a/arch/mips/qemu/q-setup.c b/arch/mips/qemu/q-setup.c
index 022eb1a..f27155b 100644
--- a/arch/mips/qemu/q-setup.c
+++ b/arch/mips/qemu/q-setup.c
@@ -2,6 +2,8 @@
#include <asm/io.h>
#include <asm/time.h>
+extern void qemu_reboot_setup(void);
+
#define QEMU_PORT_BASE 0xb4000000
const char *get_system_type(void)
@@ -22,4 +24,6 @@ void __init plat_setup(void)
{
set_io_port_base(QEMU_PORT_BASE);
board_timer_setup = qemu_timer_setup;
+
+ qemu_reboot_setup();
}
diff --git a/include/asm-mips/qemu.h b/include/asm-mips/qemu.h
index 905c395..531caf4 100644
--- a/include/asm-mips/qemu.h
+++ b/include/asm-mips/qemu.h
@@ -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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