irq_i8259.c

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/*
 *      linux/arch/alpha/kernel/irq_i8259.c
 *
 * This is the 'legacy' 8259A Programmable Interrupt Controller,
 * present in the majority of PC/AT boxes.
 *
 * Started hacking from linux-2.3.30pre6/arch/i386/kernel/i8259.c.
 */

#include <linux/init.h>
#include <linux/cache.h>
#include <linux/sched.h>
#include <linux/irq.h>
#include <linux/interrupt.h>

#include <asm/io.h>

#include "proto.h"
#include "irq_impl.h"


/* Note mask bit is true for DISABLED irqs.  */
static unsigned int cached_irq_mask = 0xffff;
static DEFINE_SPINLOCK(i8259_irq_lock);

static inline void
i8259_update_irq_hw(unsigned int irq, unsigned long mask)
{
    int port = 0x21;
    if (irq & 8) mask >>= 8;
    if (irq & 8) port = 0xA1;
    outb(mask, port);
}

inline void
i8259a_enable_irq(struct irq_data *d)
{
    spin_lock(&i8259_irq_lock);
    i8259_update_irq_hw(d->irq, cached_irq_mask &= ~(1 << d->irq));
    spin_unlock(&i8259_irq_lock);
}

static inline void
__i8259a_disable_irq(unsigned int irq)
{
    i8259_update_irq_hw(irq, cached_irq_mask |= 1 << irq);
}

void
i8259a_disable_irq(struct irq_data *d)
{
    spin_lock(&i8259_irq_lock);
    __i8259a_disable_irq(d->irq);
    spin_unlock(&i8259_irq_lock);
}

void
i8259a_mask_and_ack_irq(struct irq_data *d)
{
    unsigned int irq = d->irq;

    spin_lock(&i8259_irq_lock);
    __i8259a_disable_irq(irq);

    /* Ack the interrupt making it the lowest priority.  */
    if (irq >= 8) {
        outb(0xE0 | (irq - 8), 0xa0);   /* ack the slave */
        irq = 2;
    }
    outb(0xE0 | irq, 0x20);         /* ack the master */
    spin_unlock(&i8259_irq_lock);
}

struct irq_chip i8259a_irq_type = {
    .name       = "XT-PIC",
    .irq_unmask = i8259a_enable_irq,
    .irq_mask   = i8259a_disable_irq,
    .irq_mask_ack   = i8259a_mask_and_ack_irq,
};

void __init
init_i8259a_irqs(void)
{
    static struct irqaction cascade = {
        .handler    = no_action,
        .name       = "cascade",
    };

    long i;

    outb(0xff, 0x21);   /* mask all of 8259A-1 */
    outb(0xff, 0xA1);   /* mask all of 8259A-2 */

    for (i = 0; i < 16; i++) {
        irq_set_chip_and_handler(i, &i8259a_irq_type, handle_level_irq);
    }

    setup_irq(2, &cascade);
}


#if defined(CONFIG_ALPHA_GENERIC)
# define IACK_SC    alpha_mv.iack_sc
#elif defined(CONFIG_ALPHA_APECS)
# define IACK_SC    APECS_IACK_SC
#elif defined(CONFIG_ALPHA_LCA)
# define IACK_SC    LCA_IACK_SC
#elif defined(CONFIG_ALPHA_CIA)
# define IACK_SC    CIA_IACK_SC
#elif defined(CONFIG_ALPHA_PYXIS)
# define IACK_SC    PYXIS_IACK_SC
#elif defined(CONFIG_ALPHA_TITAN)
# define IACK_SC    TITAN_IACK_SC
#elif defined(CONFIG_ALPHA_TSUNAMI)
# define IACK_SC    TSUNAMI_IACK_SC
#elif defined(CONFIG_ALPHA_IRONGATE)
# define IACK_SC        IRONGATE_IACK_SC
#endif
/* Note that CONFIG_ALPHA_POLARIS is intentionally left out here, since
   sys_rx164 wants to use isa_no_iack_sc_device_interrupt for some reason.  */

#if defined(IACK_SC)
void
isa_device_interrupt(unsigned long vector)
{
    /*
     * Generate a PCI interrupt acknowledge cycle.  The PIC will
     * respond with the interrupt vector of the highest priority
     * interrupt that is pending.  The PALcode sets up the
     * interrupts vectors such that irq level L generates vector L.
     */
    int j = *(vuip) IACK_SC;
    j &= 0xff;
    handle_irq(j);
}
#endif

#if defined(CONFIG_ALPHA_GENERIC) || !defined(IACK_SC)
void
isa_no_iack_sc_device_interrupt(unsigned long vector)
{
    unsigned long pic;

    /*
     * It seems to me that the probability of two or more *device*
     * interrupts occurring at almost exactly the same time is
     * pretty low.  So why pay the price of checking for
     * additional interrupts here if the common case can be
     * handled so much easier?
     */
    /* 
     *  The first read of gives you *all* interrupting lines.
     *  Therefore, read the mask register and and out those lines
     *  not enabled.  Note that some documentation has 21 and a1 
     *  write only.  This is not true.
     */
    pic = inb(0x20) | (inb(0xA0) << 8); /* read isr */
    pic &= 0xFFFB;              /* mask out cascade & hibits */

    while (pic) {
        int j = ffz(~pic);
        pic &= pic - 1;
        handle_irq(j);
    }
}
#endif