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reboot.c

/*
 * 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) || defined(BF527_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");
      }
}

00046 __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();
}

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