linux-imx

/*

 *  linux/drivers/irqchip/irq-zevio.c

 *

 *  Copyright (C) 2013 Daniel Tang <tangrs@tangrs.id.au>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2, as

 * published by the Free Software Foundation.

 *

 */

​

#include <linux/io.h>

#include <linux/irq.h>

#include <linux/irqchip.h>

#include <linux/of.h>

#include <linux/of_address.h>

#include <linux/of_irq.h>

​

#include <asm/mach/irq.h>

#include <asm/exception.h>

​

#define IO_STATUS   0x000

#define IO_RAW_STATUS   0x004

#define IO_ENABLE   0x008

#define IO_DISABLE  0x00C

#define IO_CURRENT  0x020

#define IO_RESET    0x028

#define IO_MAX_PRIOTY   0x02C

​

#define IO_IRQ_BASE 0x000

#define IO_FIQ_BASE 0x100

​

#define IO_INVERT_SEL   0x200

#define IO_STICKY_SEL   0x204

#define IO_PRIORITY_SEL 0x300

​

#define MAX_INTRS   32

#define FIQ_START   MAX_INTRS

​

static struct irq_domain *zevio_irq_domain;

static void __iomem *zevio_irq_io;

​

static void zevio_irq_ack(struct irq_data *irqd)

{

    struct irq_chip_generic *gc = irq_data_get_irq_chip_data(irqd);

    struct irq_chip_regs *regs = &irq_data_get_chip_type(irqd)->regs;

​

    readl(gc->reg_base + regs->ack);

}

​

static void __exception_irq_entry zevio_handle_irq(struct pt_regs *regs)

{

    int irqnr;

​

    while (readl(zevio_irq_io + IO_STATUS)) {

        irqnr = readl(zevio_irq_io + IO_CURRENT);

        handle_domain_irq(zevio_irq_domain, irqnr, regs);

    };

}

​

static void __init zevio_init_irq_base(void __iomem *base)

{

    /* Disable all interrupts */