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[MIPS] Qemu system shutdown support

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Signed-off-by: Thiemo Seufer <ths@networkno.de>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Thiemo Seufer 2006-05-15 18:59:34 +01:00 committed by Ralf Baechle
parent eae89076e6
commit c583122c26
4 changed files with 45 additions and 1 deletions
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2
arch/mips/qemu/Makefile
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@ -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

34
arch/mips/qemu/q-reset.c Normal file
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@ -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;
}

4
arch/mips/qemu/q-setup.c
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@ -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();
}

6
include/asm-mips/qemu.h
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@ -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 */