linux-imx

/*

 *  Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>

 *  JZ4740 platform IRQ support

 *

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

 *  under  the terms of the GNU General  Public License as published by the

 *  Free Software Foundation;  either version 2 of the License, or (at your

 *  option) any later version.

 *

 *  You should have received a copy of the GNU General Public License along

 *  with this program; if not, write to the Free Software Foundation, Inc.,

 *  675 Mass Ave, Cambridge, MA 02139, USA.

 *

 */

​

#include <linux/errno.h>

#include <linux/init.h>

#include <linux/types.h>

#include <linux/interrupt.h>

#include <linux/ioport.h>

#include <linux/irqchip.h>

#include <linux/irqchip/ingenic.h>

#include <linux/of_address.h>

#include <linux/of_irq.h>

#include <linux/timex.h>

#include <linux/slab.h>

#include <linux/delay.h>

​

#include <asm/io.h>

#include <asm/mach-jz4740/irq.h>

​

struct ingenic_intc_data {

    void __iomem *base;

    unsigned num_chips;

};

​

#define JZ_REG_INTC_STATUS  0x00

#define JZ_REG_INTC_MASK    0x04

#define JZ_REG_INTC_SET_MASK    0x08

#define JZ_REG_INTC_CLEAR_MASK  0x0c

#define JZ_REG_INTC_PENDING 0x10

#define CHIP_SIZE       0x20

​

static irqreturn_t intc_cascade(int irq, void *data)

{

    struct ingenic_intc_data *intc = irq_get_handler_data(irq);

    uint32_t irq_reg;

    unsigned i;

​

    for (i = 0; i < intc->num_chips; i++) {

        irq_reg = readl(intc->base + (i * CHIP_SIZE) +

                JZ_REG_INTC_PENDING);

        if (!irq_reg)

            continue;

​

        generic_handle_irq(__fls(irq_reg) + (i * 32) + JZ4740_IRQ_BASE);

    }

​

    return IRQ_HANDLED;

}

​

static void intc_irq_set_mask(struct irq_chip_generic *gc, uint32_t mask)

{