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author | Michael Hennerich <michael.hennerich@analog.com> | 2007-10-11 00:29:49 +0800 |
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committer | Bryan Wu <bryan.wu@analog.com> | 2007-10-11 00:29:49 +0800 |
commit | 2714d9a6d1e68d30f5be8871722a7cff388c2d74 (patch) | |
tree | ccf786e468a2f3b79f10a862321c2f0e842bcab4 /arch/blackfin | |
parent | 4b3f058a7a34a10d99937e86bb28da118710ca9a (diff) | |
download | kernel_samsung_crespo-2714d9a6d1e68d30f5be8871722a7cff388c2d74.zip kernel_samsung_crespo-2714d9a6d1e68d30f5be8871722a7cff388c2d74.tar.gz kernel_samsung_crespo-2714d9a6d1e68d30f5be8871722a7cff388c2d74.tar.bz2 |
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>
Diffstat (limited to 'arch/blackfin')
-rw-r--r-- | arch/blackfin/kernel/reboot.c | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/arch/blackfin/kernel/reboot.c b/arch/blackfin/kernel/reboot.c new file mode 100644 index 0000000..356078e --- /dev/null +++ b/arch/blackfin/kernel/reboot.c @@ -0,0 +1,78 @@ +/* + * 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(); +} |