/*
 * r8a7779 processor support - INTC hardware block
 *
 * Copyright (C) 2011  Renesas Solutions Corp.
 * Copyright (C) 2011  Magnus Damm
 *
 * 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; version 2 of the License.
 *
 * 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.
 *
 * 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <linux/irqchip/arm-gic.h>
#include <linux/platform_data/irq-renesas-intc-irqpin.h>
#include <linux/irqchip.h>
#include <mach/common.h>
#include <mach/intc.h>
#include <mach/irqs.h>
#include <mach/r8a7779.h>
#include <asm/mach-types.h>
#include <asm/mach/arch.h>

#define INT2SMSKCR0 IOMEM(0xfe7822a0)
#define INT2SMSKCR1 IOMEM(0xfe7822a4)
#define INT2SMSKCR2 IOMEM(0xfe7822a8)
#define INT2SMSKCR3 IOMEM(0xfe7822ac)
#define INT2SMSKCR4 IOMEM(0xfe7822b0)

#define INT2NTSR0 IOMEM(0xfe700060)
#define INT2NTSR1 IOMEM(0xfe700064)

static struct renesas_intc_irqpin_config irqpin0_platform_data = {
	.irq_base = irq_pin(0), /* IRQ0 -> IRQ3 */
	.sense_bitfield_width = 2,
};

static struct resource irqpin0_resources[] = {
	DEFINE_RES_MEM(0xfe78001c, 4), /* ICR1 */
	DEFINE_RES_MEM(0xfe780010, 4), /* INTPRI */
	DEFINE_RES_MEM(0xfe780024, 4), /* INTREQ */
	DEFINE_RES_MEM(0xfe780044, 4), /* INTMSK0 */
	DEFINE_RES_MEM(0xfe780064, 4), /* INTMSKCLR0 */
	DEFINE_RES_IRQ(gic_spi(27)), /* IRQ0 */
	DEFINE_RES_IRQ(gic_spi(28)), /* IRQ1 */
	DEFINE_RES_IRQ(gic_spi(29)), /* IRQ2 */
	DEFINE_RES_IRQ(gic_spi(30)), /* IRQ3 */
};

static struct platform_device irqpin0_device = {
	.name		= "renesas_intc_irqpin",
	.id		= 0,
	.resource	= irqpin0_resources,
	.num_resources	= ARRAY_SIZE(irqpin0_resources),
	.dev		= {
		.platform_data	= &irqpin0_platform_data,
	},
};

void __init r8a7779_init_irq_extpin(int irlm)
{
	void __iomem *icr0 = ioremap_nocache(0xfe780000, PAGE_SIZE);
	unsigned long tmp;

	if (icr0) {
		tmp = ioread32(icr0);
		if (irlm)
			tmp |= 1 << 23; /* IRQ0 -> IRQ3 as individual pins */
		else
			tmp &= ~(1 << 23); /* IRL mode - not supported */
		tmp |= (1 << 21); /* LVLMODE = 1 */
		iowrite32(tmp, icr0);
		iounmap(icr0);

		if (irlm)
			platform_device_register(&irqpin0_device);
	} else
		pr_warn("r8a7779: unable to setup external irq pin mode\n");
}

static int r8a7779_set_wake(struct irq_data *data, unsigned int on)
{
	return 0; /* always allow wakeup */
}

static void __init r8a7779_init_irq_common(void)
{
	gic_arch_extn.irq_set_wake = r8a7779_set_wake;

	/* route all interrupts to ARM */
	__raw_writel(0xffffffff, INT2NTSR0);
	__raw_writel(0x3fffffff, INT2NTSR1);

	/* unmask all known interrupts in INTCS2 */
	__raw_writel(0xfffffff0, INT2SMSKCR0);
	__raw_writel(0xfff7ffff, INT2SMSKCR1);
	__raw_writel(0xfffbffdf, INT2SMSKCR2);
	__raw_writel(0xbffffffc, INT2SMSKCR3);
	__raw_writel(0x003fee3f, INT2SMSKCR4);
}

void __init r8a7779_init_irq(void)
{
	void __iomem *gic_dist_base = IOMEM(0xf0001000);
	void __iomem *gic_cpu_base = IOMEM(0xf0000100);

	/* use GIC to handle interrupts */
	gic_init(0, 29, gic_dist_base, gic_cpu_base);

	r8a7779_init_irq_common();
}

#ifdef CONFIG_OF
void __init r8a7779_init_irq_dt(void)
{
	irqchip_init();
	r8a7779_init_irq_common();
}
#endif