ints.c

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/*
 * linux/arch/m68k/kernel/ints.c -- Linux/m68k general interrupt handling code
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file COPYING in the main directory of this archive
 * for more details.
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/kernel_stat.h>
#include <linux/errno.h>
#include <linux/init.h>

#include <asm/setup.h>
#include <asm/irq.h>
#include <asm/traps.h>
#include <asm/page.h>
#include <asm/machdep.h>
#include <asm/cacheflush.h>
#include <asm/irq_regs.h>

#ifdef CONFIG_Q40
#include <asm/q40ints.h>
#endif

extern u32 auto_irqhandler_fixup[];
extern u16 user_irqvec_fixup[];

static int m68k_first_user_vec;

static struct irq_chip auto_irq_chip = {
    .name       = "auto",
    .irq_startup    = m68k_irq_startup,
    .irq_shutdown   = m68k_irq_shutdown,
};

static struct irq_chip user_irq_chip = {
    .name       = "user",
    .irq_startup    = m68k_irq_startup,
    .irq_shutdown   = m68k_irq_shutdown,
};

/*
 * void init_IRQ(void)
 *
 * Parameters:  None
 *
 * Returns: Nothing
 *
 * This function should be called during kernel startup to initialize
 * the IRQ handling routines.
 */

void __init init_IRQ(void)
{
    int i;

    /* assembly irq entry code relies on this... */
    if (HARDIRQ_MASK != 0x00ff0000) {
        extern void hardirq_mask_is_broken(void);
        hardirq_mask_is_broken();
    }

    for (i = IRQ_AUTO_1; i <= IRQ_AUTO_7; i++)
        irq_set_chip_and_handler(i, &auto_irq_chip, handle_simple_irq);

    mach_init_IRQ();
}

void __init m68k_setup_auto_interrupt(void (*handler)(unsigned int, struct pt_regs *))
{
    if (handler)
        *auto_irqhandler_fixup = (u32)handler;
    flush_icache();
}

void __init m68k_setup_user_interrupt(unsigned int vec, unsigned int cnt)
{
    int i;

    BUG_ON(IRQ_USER + cnt > NR_IRQS);
    m68k_first_user_vec = vec;
    for (i = 0; i < cnt; i++)
        irq_set_chip(IRQ_USER + i, &user_irq_chip);
    *user_irqvec_fixup = vec - IRQ_USER;
    flush_icache();
}

void m68k_setup_irq_controller(struct irq_chip *chip,
                   irq_flow_handler_t handle, unsigned int irq,
                   unsigned int cnt)
{
    int i;

    for (i = 0; i < cnt; i++) {
        irq_set_chip(irq + i, chip);
        if (handle)
            irq_set_handler(irq + i, handle);
    }
}

unsigned int m68k_irq_startup_irq(unsigned int irq)
{
    if (irq <= IRQ_AUTO_7)
        vectors[VEC_SPUR + irq] = auto_inthandler;
    else
        vectors[m68k_first_user_vec + irq - IRQ_USER] = user_inthandler;
    return 0;
}

unsigned int m68k_irq_startup(struct irq_data *data)
{
    return m68k_irq_startup_irq(data->irq);
}

void m68k_irq_shutdown(struct irq_data *data)
{
    unsigned int irq = data->irq;

    if (irq <= IRQ_AUTO_7)
        vectors[VEC_SPUR + irq] = bad_inthandler;
    else
        vectors[m68k_first_user_vec + irq - IRQ_USER] = bad_inthandler;
}


unsigned int irq_canonicalize(unsigned int irq)
{
#ifdef CONFIG_Q40
    if (MACH_IS_Q40 && irq == 11)
        irq = 10;
#endif
    return irq;
}

EXPORT_SYMBOL(irq_canonicalize);


asmlinkage void handle_badint(struct pt_regs *regs)
{
    atomic_inc(&irq_err_count);
    pr_warn("unexpected interrupt from %u\n", regs->vector);
}