irq.c

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/*
 * Interrupt handling H8/300H depend.
 * Yoshinori Sato <[email protected]>
 *
 */

#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-internal.h>
#include <asm/regs306x.h>

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

const h8300_vector __initconst 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;
    }
}