diff options
-rw-r--r-- | arch/blackfin/kernel/reboot.c | 78 | ||||
-rw-r--r-- | include/asm-blackfin/reboot.h | 20 |
2 files changed, 98 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(); +} diff --git a/include/asm-blackfin/reboot.h b/include/asm-blackfin/reboot.h new file mode 100644 index 0000000..6d448b5 --- /dev/null +++ b/include/asm-blackfin/reboot.h @@ -0,0 +1,20 @@ +/* + * 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 |