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irq.c

/*
 * Interrupt handling H8/300H depend.
 * Yoshinori Sato <ysato@users.sourceforge.jp>
 *
 */

#include <linux/init.h>
#include <linux/errno.h>

#include <asm/ptrace.h>
#include <asm/traps.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <asm/gpio.h>
#include <asm/regs306x.h>

const int __initdata h8300_saved_vectors[] = {
#if defined(CONFIG_GDB_DEBUG)
      TRAP3_VEC,  /* TRAPA #3 is GDB breakpoint */
#endif
      -1,
};

const h8300_vector __initdata h8300_trap_table[] = {
      0, 0, 0, 0, 0, 0, 0, 0,
      system_call,
      0,
      0,
      trace_break,
};

int h8300_enable_irq_pin(unsigned int irq)
{
      int bitmask;
      if (irq < EXT_IRQ0 || irq > EXT_IRQ5)
            return 0;

      /* initialize IRQ pin */
      bitmask = 1 << (irq - EXT_IRQ0);
      switch(irq) {
      case EXT_IRQ0:
      case EXT_IRQ1:
      case EXT_IRQ2:
      case EXT_IRQ3:
            if (H8300_GPIO_RESERVE(H8300_GPIO_P8, bitmask) == 0)
                  return -EBUSY;
            H8300_GPIO_DDR(H8300_GPIO_P8, bitmask, H8300_GPIO_INPUT);
            break;
      case EXT_IRQ4:
      case EXT_IRQ5:
            if (H8300_GPIO_RESERVE(H8300_GPIO_P9, bitmask) == 0)
                  return -EBUSY;
            H8300_GPIO_DDR(H8300_GPIO_P9, bitmask, H8300_GPIO_INPUT);
            break;
      }

      return 0;
}

void h8300_disable_irq_pin(unsigned int irq)
{
      int bitmask;
      if (irq < EXT_IRQ0 || irq > EXT_IRQ5)
            return;

      /* disable interrupt & release IRQ pin */
      bitmask = 1 << (irq - EXT_IRQ0);
      switch(irq) {
      case EXT_IRQ0:
      case EXT_IRQ1:
      case EXT_IRQ2:
      case EXT_IRQ3:
            *(volatile unsigned char *)IER &= ~bitmask;
            H8300_GPIO_FREE(H8300_GPIO_P8, bitmask);
            break ;
      case EXT_IRQ4:
      case EXT_IRQ5:
            *(volatile unsigned char *)IER &= ~bitmask;
            H8300_GPIO_FREE(H8300_GPIO_P9, bitmask);
            break;
      }
}

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