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sh: Use internal watchdog timer to perform reset

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This patches will trigger a reboot using the watchdog
timer instead of double fault.  Unlike the previous
method, this one actually works in 32 bit mode.

Reset should also be cleaner.

Signed-off-by: Jon Frosdick <jon.frosdick@st.com>
Signed-off-by: Carl Shaw <carl.shaw@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Jon Frosdick 2009-08-24 16:20:44 +09:00 committed by Paul Mundt
parent 27a30f53bb
commit b46373e0d4
1 changed files with 20 additions and 0 deletions
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20
arch/sh/kernel/process_32.c
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@ -32,15 +32,35 @@
#include <asm/ubc.h>
#include <asm/fpu.h>
#include <asm/syscalls.h>
#include <asm/watchdog.h>
int ubc_usercnt = 0;
#ifdef CONFIG_32BIT
static void watchdog_trigger_immediate(void)
{
sh_wdt_write_cnt(0xFF);
sh_wdt_write_csr(0xC2);
}
void machine_restart(char * __unused)
{
local_irq_disable();
/* Use watchdog timer to trigger reset */
watchdog_trigger_immediate();
while (1)
cpu_sleep();
}
#else
void machine_restart(char * __unused)
{
/* 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));
}
#endif
void machine_halt(void)
{