linux-imx

/*

 * drivers/irq/irq-nvic.c

 *

 * Copyright (C) 2008 ARM Limited, All Rights Reserved.

 * Copyright (C) 2013 Pengutronix

 *

 * 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.

 *

 * Support for the Nested Vectored Interrupt Controller found on the

 * ARMv7-M CPUs (Cortex-M3/M4)

 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

​

#include <linux/init.h>

#include <linux/kernel.h>

#include <linux/slab.h>

#include <linux/err.h>

#include <linux/io.h>

#include <linux/of.h>

#include <linux/of_address.h>

#include <linux/irq.h>

#include <linux/irqchip.h>

#include <linux/irqdomain.h>

​

#include <asm/v7m.h>

#include <asm/exception.h>

​

#define NVIC_ISER       0x000

#define NVIC_ICER       0x080

#define NVIC_IPR        0x300

​

#define NVIC_MAX_BANKS      16

/*

 * Each bank handles 32 irqs. Only the 16th (= last) bank handles only

 * 16 irqs.

 */

#define NVIC_MAX_IRQ        ((NVIC_MAX_BANKS - 1) * 32 + 16)

​

static struct irq_domain *nvic_irq_domain;

​

asmlinkage void __exception_irq_entry

nvic_handle_irq(irq_hw_number_t hwirq, struct pt_regs *regs)

{

    unsigned int irq = irq_linear_revmap(nvic_irq_domain, hwirq);

​

    handle_IRQ(irq, regs);

}

​

static int nvic_irq_domain_translate(struct irq_domain *d,

                     struct irq_fwspec *fwspec,

                     unsigned long *hwirq, unsigned int *type)

{

    if (WARN_ON(fwspec->param_count < 1))

        return -EINVAL;

    *hwirq = fwspec->param[0];

    *type = IRQ_TYPE_NONE;

    return 0;

}

​

static int nvic_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,

                unsigned int nr_irqs, void *arg)