intc-525x.c

Go to the documentation of this file.

/*
 * intc2.c  -- support for the 2nd INTC controller of the 525x
 *
 * (C) Copyright 2012, Steven King <[email protected]>
 * (C) Copyright 2009, Greg Ungerer <[email protected]>
 *
 * 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/types.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <asm/coldfire.h>
#include <asm/mcfsim.h>

static void intc2_irq_gpio_mask(struct irq_data *d)
{
    u32 imr = readl(MCFSIM2_GPIOINTENABLE);
    u32 type = irqd_get_trigger_type(d);
    int irq = d->irq - MCF_IRQ_GPIO0;

    if (type & IRQ_TYPE_EDGE_RISING)
        imr &= ~(0x001 << irq);
    if (type & IRQ_TYPE_EDGE_FALLING)
        imr &= ~(0x100 << irq);
    writel(imr, MCFSIM2_GPIOINTENABLE);
}

static void intc2_irq_gpio_unmask(struct irq_data *d)
{
    u32 imr = readl(MCFSIM2_GPIOINTENABLE);
    u32 type = irqd_get_trigger_type(d);
    int irq = d->irq - MCF_IRQ_GPIO0;

    if (type & IRQ_TYPE_EDGE_RISING)
        imr |= (0x001 << irq);
    if (type & IRQ_TYPE_EDGE_FALLING)
        imr |= (0x100 << irq);
    writel(imr, MCFSIM2_GPIOINTENABLE);
}

static void intc2_irq_gpio_ack(struct irq_data *d)
{
    u32 imr = 0;
    u32 type = irqd_get_trigger_type(d);
    int irq = d->irq - MCF_IRQ_GPIO0;

    if (type & IRQ_TYPE_EDGE_RISING)
        imr |= (0x001 << irq);
    if (type & IRQ_TYPE_EDGE_FALLING)
        imr |= (0x100 << irq);
    writel(imr, MCFSIM2_GPIOINTCLEAR);
}

static int intc2_irq_gpio_set_type(struct irq_data *d, unsigned int f)
{
    if (f & ~IRQ_TYPE_EDGE_BOTH)
        return -EINVAL;
    return 0;
}

static struct irq_chip intc2_irq_gpio_chip = {
    .name       = "CF-INTC2",
    .irq_mask   = intc2_irq_gpio_mask,
    .irq_unmask = intc2_irq_gpio_unmask,
    .irq_ack    = intc2_irq_gpio_ack,
    .irq_set_type   = intc2_irq_gpio_set_type,
};

static int __init mcf_intc2_init(void)
{
    int irq;

    /* set the interrupt base for the second interrupt controller */
    writel(MCFINTC2_VECBASE, MCFINTC2_INTBASE);

    /* GPIO interrupt sources */
    for (irq = MCF_IRQ_GPIO0; (irq <= MCF_IRQ_GPIO6); irq++) {
        irq_set_chip(irq, &intc2_irq_gpio_chip);
        irq_set_handler(irq, handle_edge_irq);
    }

    return 0;
}

arch_initcall(mcf_intc2_init);