path: root/drivers/irqchip/irq-s3c24xx.c

/*
 * S3C24XX IRQ handling
 *
 * Copyright (c) 2003-2004 Simtec Electronics
 *	Ben Dooks <ben@simtec.co.uk>
 * Copyright (c) 2012 Heiko Stuebner <heiko@sntech.de>
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
*/

#include <linux/init.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/io.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/device.h>
#include <linux/irqdomain.h>
#include <linux/irqchip/chained_irq.h>
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/of_address.h>

#include <asm/exception.h>
#include <asm/mach/irq.h>

#include <mach/regs-irq.h>
#include <mach/regs-gpio.h>

#include <plat/cpu.h>
#include <plat/regs-irqtype.h>
#include <plat/pm.h>

#include "irqchip.h"

#define S3C_IRQTYPE_NONE	0
#define S3C_IRQTYPE_EINT	1
#define S3C_IRQTYPE_EDGE	2
#define S3C_IRQTYPE_LEVEL	3

struct s3c_irq_data {
	unsigned int type;
	unsigned long offset;
	unsigned long parent_irq;

	/* data gets filled during init */
	struct s3c_irq_intc *intc;
	unsigned long sub_bits;
	struct s3c_irq_intc *sub_intc;
};

/*
 * Sructure holding the controller data
 * @reg_pending		register holding pending irqs
 * @reg_intpnd		special register intpnd in main intc
 * @reg_mask		mask register
 * @domain		irq_domain of the controller
 * @parent		parent controller for ext and sub irqs
 * @irqs		irq-data, always s3c_irq_data[32]
 */
struct s3c_irq_intc {
	void __iomem		*reg_pending;
	void __iomem		*reg_intpnd;
	void __iomem		*reg_mask;
	struct irq_domain	*domain;
	struct s3c_irq_intc	*parent;
	struct s3c_irq_data	*irqs;
};

/*
 * Array holding pointers to the global controller structs
 * [0] ... main_intc
 * [1] ... sub_intc
 * [2] ... main_intc2 on s3c2416
 */
static struct s3c_irq_intc *s3c_intc[3];

static void s3c_irq_mask(struct irq_data *data)
{
	struct s3c_irq_data *irq_data = irq_data_get_irq_chip_data(data);
	struct s3c_irq_intc *intc = irq_data->intc;
	struct s3c_irq_intc *parent_intc = intc->parent;
	struct s3c_irq_data *parent_data;
	unsigned long mask;
	unsigned int irqno;

	mask = __raw_readl(intc->reg_mask);
	mask |= (1UL << irq_data->offset);
	__raw_writel(mask, intc->reg_mask);

	if (pare