irq.c

Go to the documentation of this file.

/*
 * s6000 irq crossbar
 *
 * Copyright (c) 2009 emlix GmbH
 * Authors: Johannes Weiner <[email protected]>
 *      Oskar Schirmer <[email protected]>
 */
#include <linux/io.h>
#include <asm/irq.h>
#include <variant/hardware.h>

/* S6_REG_INTC */
#define INTC_STATUS 0x000
#define INTC_RAW    0x010
#define INTC_STATUS_AG  0x100
#define INTC_CFG(n) (0x200 + 4 * (n))

/*
 * The s6000 has a crossbar that multiplexes interrupt output lines
 * from the peripherals to input lines on the xtensa core.
 *
 * We leave the mapping decisions to the platform as it depends on the
 * actually connected peripherals which distribution makes sense.
 */
extern const signed char *platform_irq_mappings[NR_IRQS];

static unsigned long scp_to_intc_enable[] = {
#define TO_INTC_ENABLE(n)   (((n) << 1) + 1)
    TO_INTC_ENABLE(0),
    TO_INTC_ENABLE(1),
    TO_INTC_ENABLE(2),
    TO_INTC_ENABLE(3),
    TO_INTC_ENABLE(4),
    TO_INTC_ENABLE(5),
    TO_INTC_ENABLE(6),
    TO_INTC_ENABLE(7),
    TO_INTC_ENABLE(8),
    TO_INTC_ENABLE(9),
    TO_INTC_ENABLE(10),
    TO_INTC_ENABLE(11),
    TO_INTC_ENABLE(12),
    -1,
    -1,
    TO_INTC_ENABLE(13),
    -1,
    TO_INTC_ENABLE(14),
    -1,
    TO_INTC_ENABLE(15),
#undef  TO_INTC_ENABLE
};

static void irq_set(unsigned int irq, int enable)
{
    unsigned long en;
    const signed char *m = platform_irq_mappings[irq];

    if (!m)
        return;
    en = enable ? scp_to_intc_enable[irq] : 0;
    while (*m >= 0) {
        writel(en, S6_REG_INTC + INTC_CFG(*m));
        m++;
    }
}

void variant_irq_enable(unsigned int irq)
{
    irq_set(irq, 1);
}

void variant_irq_disable(unsigned int irq)
{
    irq_set(irq, 0);
}