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Blackfin arch: Workaround reboot bug, issue SSYNC at the start of bfin_reset 

reboot failes on BF533
http://blackfin.uclinux.org/gf/project/uclinux-dist/tracker/?action=TrackerItemEdit&tracker_item_id=3500

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>
This commit is contained in:
Michael Hennerich 2007-10-11 00:29:49 +08:00 committed by Bryan Wu
parent 4b3f058a7a
commit 2714d9a6d1
2 changed files with 98 additions and 0 deletions
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78
arch/blackfin/kernel/reboot.c Normal file
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/*
* arch/blackfin/kernel/reboot.c - handle shutdown/reboot
*
* Copyright 2004-2007 Analog Devices Inc.
*
* Licensed under the GPL-2 or later.
*/
#include <linux/interrupt.h>
#include <asm/bfin-global.h>
#include <asm/reboot.h>
#include <asm/system.h>
#if defined(BF537_FAMILY) || defined(BF533_FAMILY)
#define SYSCR_VAL 0x0
#elif defined(BF561_FAMILY)
#define SYSCR_VAL 0x20
#elif defined(BF548_FAMILY)
#define SYSCR_VAL 0x10
#endif
/* A system soft reset makes external memory unusable
* so force this function into L1.
*/
__attribute__((l1_text))
void bfin_reset(void)
{
/* force BMODE and disable Core B (as needed) */
bfin_write_SYSCR(SYSCR_VAL);
/* we use asm ssync here because it's save and we save some L1 */
asm("ssync;");
while (1) {
/* initiate system soft reset with magic 0x7 */
bfin_write_SWRST(0x7);
asm("ssync;");
/* clear system soft reset */
bfin_write_SWRST(0);
asm("ssync;");
/* issue core reset */
asm("raise 1");
}
}
__attribute__((weak))
void native_machine_restart(char *cmd)
{
}
void machine_restart(char *cmd)
{
native_machine_restart(cmd);
local_irq_disable();
bfin_reset();
}
__attribute__((weak))
void native_machine_halt(void)
{
idle_with_irq_disabled();
}
void machine_halt(void)
{
native_machine_halt();
}
__attribute__((weak))
void native_machine_power_off(void)
{
idle_with_irq_disabled();
}
void machine_power_off(void)
{
native_machine_power_off();
}

20
include/asm-blackfin/reboot.h Normal file
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/*
* include/asm-blackfin/reboot.h - shutdown/reboot header
*
* Copyright 2004-2007 Analog Devices Inc.
*
* Licensed under the GPL-2 or later.
*/
#ifndef __ASM_REBOOT_H__
#define __ASM_REBOOT_H__
/* optional board specific hooks */
extern void native_machine_restart(char *cmd);
extern void native_machine_halt(void);
extern void native_machine_power_off(void);
/* common reboot workarounds */
extern void bfin_gpio_reset_spi0_ssel1(void);
#endif