/*
 * MXC GPIO support. (c) 2008 Daniel Mack <daniel@caiaq.de>
 * Copyright 2008 Juergen Beisert, kernel@pengutronix.de
 *
 * Based on code from Freescale,
 * Copyright 2004-2006 Freescale Semiconductor, Inc. All Rights Reserved.
 *
 * 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.
 *
 * 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 Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

#include <linux/init.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/gpio.h>
#include <mach/hardware.h>
#include <asm-generic/bug.h>

static struct mxc_gpio_port *mxc_gpio_ports;
static int gpio_table_size;

/* Note: This driver assumes 32 GPIOs are handled in one register */

static void _clear_gpio_irqstatus(struct mxc_gpio_port *port, u32 index)
{
	__raw_writel(1 << index, port->base + GPIO_ISR);
}

static void _set_gpio_irqenable(struct mxc_gpio_port *port, u32 index,
				int enable)
{
	u32 l;

	l = __raw_readl(port->base + GPIO_IMR);
	l = (l & (~(1 << index))) | (!!enable << index);
	__raw_writel(l, port->base + GPIO_IMR);
}

static void gpio_ack_irq(u32 irq)
{
	u32 gpio = irq_to_gpio(irq);
	_clear_gpio_irqstatus(&mxc_gpio_ports[gpio / 32], gpio & 0x1f);
}

static void gpio_mask_irq(u32 irq)
{
	u32 gpio = irq_to_gpio(irq);
	_set_gpio_irqenable(&mxc_gpio_ports[gpio / 32], gpio & 0x1f, 0);
}

static void gpio_unmask_irq(u32 irq)
{
	u32 gpio = irq_to_gpio(irq);
	_set_gpio_irqenable(&mxc_gpio_ports[gpio / 32], gpio & 0x1f, 1);
}

static int mxc_gpio_get(struct gpio_chip *chip, unsigned offset);

static int gpio_set_irq_type(u32 irq, u32 type)
{
	u32 gpio = irq_to_gpio(irq);
	struct mxc_gpio_port *port = &mxc_gpio_ports[gpio / 32];
	u32 bit, val;
	int edge;
	void __iomem *reg = port->base;

	port->both_edges &= ~(1 << (gpio & 31));
	switch (type) {
	case IRQ_TYPE_EDGE_RISING:
		edge = GPIO_INT_RISE_EDGE;
		break;
	case IRQ_TYPE_EDGE_FALLING:
		edge = GPIO_INT_FALL_EDGE;
		break;
	case IRQ_TYPE_EDGE_BOTH:
		val = mxc_gpio_get(&port->chip, gpio & 31);
		if (val) {
			edge = GPIO_INT_LOW_LEV;
			pr_debug("mxc: set GPIO %d to low trigger\n", gpio);
		} else {
			edge = GPIO_INT_HIGH_LEV;
			pr_debug("mxc: set GPIO %d to high trigger\n", gpio);
		}
		port->both_edges |= 1 << (gpio & 31);
		break;
	case IRQ_TYPE_LEVEL_LOW:
		edge = GPIO_INT_LOW_LEV;
		break;
	case IRQ_TYPE_LEVEL_HIGH:
		edge = GPIO_INT_HIGH_LEV;
		break;
	default:
		return -EINVAL;
	}

	reg += GPIO_ICR1 + ((gpio & 0x10) >> 2); /* lower or upper register */
	bit = gpio & 0xf;
	val = __raw_readl(reg) & ~(0x3 << (bit << 1));
	__raw_writel(val | (edge << (bit << 1)), reg);
	_clear_gpio_irqstatus(port, gpio & 0x1f);

	return 0;
}

static void mxc_flip_edge(struct mxc_gpio_port *port, u32 gpio)
{
	void __iomem *reg = port->base;
	u32 bit, val;
	int edge;

	reg += GPIO_ICR1 + ((gpio & 0x10) >> 2); /* lower or upper register */
	bit = gpio & 0xf;
	val = __raw_readl(reg);
	edge = (val >> (bit << 1)) & 3;
	val &= ~(0x3 << (bit << 1));
	switch (edge) {
	case GPIO_INT_HIGH_LEV:
		edge = GPIO_INT_LOW_LEV;
		pr_debug("mxc: switch GPIO %d to low trigger\n", gpio);
		break;
	case GPIO_INT_LOW_LEV:
		edge = GPIO_INT_HIGH_LEV;
		pr_debug("mxc: switch GPIO %d to high trigger\n", gpio);
		break;
	default:
		pr_err("mxc: invalid configuration for GPIO %d: %x\n",
		       gpio, edge);
		return;
	}
	__raw_writel(val | (edge << (bit << 1)), reg);
}

/* handle n interrupts in one status register */
static void mxc_gpio_irq_handler(struct mxc_gpio_port *port, u32 irq_stat)
{
	u32 gpio_irq_no;

	gpio_irq_no = port->virtual_irq_start;
	for (; irq_stat != 0; irq_stat >>= 1, gpio_irq_no++) {
		u32 gpio = irq_to_gpio(gpio_irq_no);

		if ((irq_stat & 1) == 0)
			continue;

		BUG_ON(!(irq_desc[gpio_irq_no].handle_irq));

		if (port->both_edges & (1 << (gpio & 31)))
			mxc_flip_edge(port, gpio);

		irq_desc[gpio_irq_no].handle_irq(gpio_irq_no,
				&irq_desc[gpio_irq_no]);
	}
}

#if defined(CONFIG_ARCH_MX3) || defined(CONFIG_ARCH_MX1)
/* MX1 and MX3 has one interrupt *per* gpio port */
static void mx3_gpio_irq_handler(u32 irq, struct irq_desc *desc)
{
	u32 irq_stat;
	struct mxc_gpio_port *port = (struct mxc_gpio_port *)get_irq_data(irq);

	irq_stat = __raw_readl(port->base + GPIO_ISR) &
			__raw_readl(port->base + GPIO_IMR);

	mxc_gpio_irq_handler(port, irq_stat);
}
#endif

#ifdef CONFIG_ARCH_MX2
/* MX2 has one interrupt *for all* gpio ports */
static void mx2_gpio_irq_handler(u32 irq, struct irq_desc *desc)
{
	int i;
	u32 irq_msk, irq_stat;
	struct mxc_gpio_port *port = (struct mxc_gpio_port *)get_irq_data(irq);

	/* walk through all interrupt status registers */
	for (i = 0; i < gpio_table_size; i++) {
		irq_msk = __raw_readl(port[i].base + GPIO_IMR);
		if (!irq_msk)
			continue;

		irq_stat = __raw_readl(port[i].base + GPIO_ISR) & irq_msk;
		if (irq_stat)
			mxc_gpio_irq_handler(&port[i], irq_stat);
	}
}
#endif

static struct irq_chip gpio_irq_chip = {
	.ack = gpio_ack_irq,
	.mask = gpio_mask_irq,
	.unmask = gpio_unmask_irq,
	.set_type = gpio_set_irq_type,
};

static void _set_gpio_direction(struct gpio_chip *chip, unsigned offset,
				int dir)
{
	struct mxc_gpio_port *port =
		container_of(chip, struct mxc_gpio_port, chip);
	u32 l;

	l = __raw_readl(port->base + GPIO_GDIR);
	if (dir)
		l |= 1 << offset;
	else
		l &= ~(1 << offset);
	__raw_writel(l, port->base + GPIO_GDIR);
}

static void mxc_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
{
	struct mxc_gpio_port *port =
		container_of(chip, struct mxc_gpio_port, chip);
	void __iomem *reg = port->base + GPIO_DR;
	u32 l;

	l = (__raw_readl(reg) & (~(1 << offset))) | (value << offset);
	__raw_writel(l, reg);
}

static int mxc_gpio_get(struct gpio_chip *chip, unsigned offset)
{
	struct mxc_gpio_port *port =
		container_of(chip, struct mxc_gpio_port, chip);

	return (__raw_readl(port->base + GPIO_PSR) >> offset) & 1;
}

static int mxc_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
{
	_set_gpio_direction(chip, offset, 0);
	return 0;
}

static int mxc_gpio_direction_output(struct gpio_chip *chip,
				     unsigned offset, int value)
{
	mxc_gpio_set(chip, offset, value);
	_set_gpio_direction(chip, offset, 1);
	return 0;
}

int __init mxc_gpio_init(struct mxc_gpio_port *port, int cnt)
{
	int i, j;

	/* save for local usage */
	mxc_gpio_ports = port;
	gpio_table_size = cnt;

	printk(KERN_INFO "MXC GPIO hardware\n");

	for (i = 0; i < cnt; i++) {
		/* disable the interrupt and clear the status */
		__raw_writel(0, port[i].base + GPIO_IMR);
		__raw_writel(~0, port[i].base + GPIO_ISR);
		for (j = port[i].virtual_irq_start;
			j < port[i].virtual_irq_start + 32; j++) {
			set_irq_chip(j, &gpio_irq_chip);
			set_irq_handler(j, handle_edge_irq);
			set_irq_flags(j, IRQF_VALID);
		}

		/* register gpio chip */
		port[i].chip.direction_input = mxc_gpio_direction_input;
		port[i].chip.direction_output = mxc_gpio_direction_output;
		port[i].chip.get = mxc_gpio_get;
		port[i].chip.set = mxc_gpio_set;
		port[i].chip.base = i * 32;
		port[i].chip.ngpio = 32;

		/* its a serious configuration bug when it fails */
		BUG_ON( gpiochip_add(&port[i].chip) < 0 );

#if defined(CONFIG_ARCH_MX3) || defined(CONFIG_ARCH_MX1)
		/* setup one handler for each entry */
		set_irq_chained_handler(port[i].irq, mx3_gpio_irq_handler);
		set_irq_data(port[i].irq, &port[i]);
#endif
	}

#ifdef CONFIG_ARCH_MX2
	/* setup one handler for all GPIO interrupts */
	set_irq_chained_handler(port[0].irq, mx2_gpio_irq_handler);
	set_irq_data(port[0].irq, port);
#endif
	return 0;
}