arch/arm/plat-s5p/irq-gpioint.c - kernel/panda - Git at Google

 /* linux/arch/arm/plat-s5p/irq-gpioint.c
  *
  * Copyright (c) 2010 Samsung Electronics Co., Ltd.
  * Author: Kyungmin Park <kyungmin.park@samsung.com>
  * Author: Joonyoung Shim <jy0922.shim@samsung.com>
  * Author: Marek Szyprowski <m.szyprowski@samsung.com>
  *
  *  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.
  *
  */

 #include <linux/kernel.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>
 #include <linux/io.h>
 #include <linux/gpio.h>
 #include <linux/slab.h>

 #include <mach/map.h>
 #include <plat/gpio-core.h>
 #include <plat/gpio-cfg.h>

 #define GPIO_BASE(chip)		(((unsigned long)(chip)->base) & 0xFFFFF000u)

 #define CON_OFFSET		0x700
 #define MASK_OFFSET		0x900
 #define PEND_OFFSET		0xA00
 #define REG_OFFSET(x)		((x) << 2)

 struct s5p_gpioint_bank {
 	struct list_head	list;
 	int			start;
 	int			nr_groups;
 	int			irq;
 	struct s3c_gpio_chip	**chips;
 	void			(*handler)(unsigned int, struct irq_desc *);
 };

 LIST_HEAD(banks);

 static int s5p_gpioint_get_offset(struct irq_data *data)
 {
 	struct s3c_gpio_chip *chip = irq_data_get_irq_handler_data(data);
 	return data->irq - chip->irq_base;
 }

 static void s5p_gpioint_ack(struct irq_data *data)
 {
 	struct s3c_gpio_chip *chip = irq_data_get_irq_handler_data(data);
 	int group, offset, pend_offset;
 	unsigned int value;

 	group = chip->group;
 	offset = s5p_gpioint_get_offset(data);
 	pend_offset = REG_OFFSET(group);

 	value = __raw_readl(GPIO_BASE(chip) + PEND_OFFSET + pend_offset);
 	value |= BIT(offset);
 	__raw_writel(value, GPIO_BASE(chip) + PEND_OFFSET + pend_offset);
 }

 static void s5p_gpioint_mask(struct irq_data *data)
 {
 	struct s3c_gpio_chip *chip = irq_data_get_irq_handler_data(data);
 	int group, offset, mask_offset;
 	unsigned int value;

 	group = chip->group;
 	offset = s5p_gpioint_get_offset(data);
 	mask_offset = REG_OFFSET(group);

 	value = __raw_readl(GPIO_BASE(chip) + MASK_OFFSET + mask_offset);
 	value |= BIT(offset);
 	__raw_writel(value, GPIO_BASE(chip) + MASK_OFFSET + mask_offset);
 }

 static void s5p_gpioint_unmask(struct irq_data *data)
 {
 	struct s3c_gpio_chip *chip = irq_data_get_irq_handler_data(data);
 	int group, offset, mask_offset;
 	unsigned int value;

 	group = chip->group;
 	offset = s5p_gpioint_get_offset(data);
 	mask_offset = REG_OFFSET(group);

 	value = __raw_readl(GPIO_BASE(chip) + MASK_OFFSET + mask_offset);
 	value &= ~BIT(offset);
 	__raw_writel(value, GPIO_BASE(chip) + MASK_OFFSET + mask_offset);
 }

 static void s5p_gpioint_mask_ack(struct irq_data *data)
 {
 	s5p_gpioint_mask(data);
 	s5p_gpioint_ack(data);
 }

 static int s5p_gpioint_set_type(struct irq_data *data, unsigned int type)
 {
 	struct s3c_gpio_chip *chip = irq_data_get_irq_handler_data(data);
 	int group, offset, con_offset;
 	unsigned int value;

 	group = chip->group;
 	offset = s5p_gpioint_get_offset(data);
 	con_offset = REG_OFFSET(group);

 	switch (type) {
 	case IRQ_TYPE_EDGE_RISING:
 		type = S5P_IRQ_TYPE_EDGE_RISING;
 		break;
 	case IRQ_TYPE_EDGE_FALLING:
 		type = S5P_IRQ_TYPE_EDGE_FALLING;
 		break;
 	case IRQ_TYPE_EDGE_BOTH:
 		type = S5P_IRQ_TYPE_EDGE_BOTH;
 		break;
 	case IRQ_TYPE_LEVEL_HIGH:
 		type = S5P_IRQ_TYPE_LEVEL_HIGH;
 		break;
 	case IRQ_TYPE_LEVEL_LOW:
 		type = S5P_IRQ_TYPE_LEVEL_LOW;
 		break;
 	case IRQ_TYPE_NONE:
 	default:
 		printk(KERN_WARNING "No irq type\n");
 		return -EINVAL;
 	}

 	value = __raw_readl(GPIO_BASE(chip) + CON_OFFSET + con_offset);
 	value &= ~(0x7 << (offset * 0x4));
 	value |= (type << (offset * 0x4));
 	__raw_writel(value, GPIO_BASE(chip) + CON_OFFSET + con_offset);

 	return 0;
 }

 static struct irq_chip s5p_gpioint = {
 	.name		= "s5p_gpioint",
 	.irq_ack	= s5p_gpioint_ack,
 	.irq_mask	= s5p_gpioint_mask,
 	.irq_mask_ack	= s5p_gpioint_mask_ack,
 	.irq_unmask	= s5p_gpioint_unmask,
 	.irq_set_type	= s5p_gpioint_set_type,
 };

 static void s5p_gpioint_handler(unsigned int irq, struct irq_desc *desc)
 {
 	struct s5p_gpioint_bank *bank = irq_get_handler_data(irq);
 	int group, pend_offset, mask_offset;
 	unsigned int pend, mask;

 	for (group = 0; group < bank->nr_groups; group++) {
 		struct s3c_gpio_chip *chip = bank->chips[group];
 		if (!chip)
 			continue;

 		pend_offset = REG_OFFSET(group);
 		pend = __raw_readl(GPIO_BASE(chip) + PEND_OFFSET + pend_offset);
 		if (!pend)
 			continue;

 		mask_offset = REG_OFFSET(group);
 		mask = __raw_readl(GPIO_BASE(chip) + MASK_OFFSET + mask_offset);
 		pend &= ~mask;

 		while (pend) {
 			int offset = fls(pend) - 1;
 			int real_irq = chip->irq_base + offset;
 			generic_handle_irq(real_irq);
 			pend &= ~BIT(offset);
 		}
 	}
 }

 static __init int s5p_gpioint_add(struct s3c_gpio_chip *chip)
 {
 	static int used_gpioint_groups = 0;
 	int irq, group = chip->group;
 	int i;
 	struct s5p_gpioint_bank *bank = NULL;

 	if (used_gpioint_groups >= S5P_GPIOINT_GROUP_COUNT)
 		return -ENOMEM;

 	list_for_each_entry(bank, &banks, list) {
 		if (group >= bank->start &&
 		    group < bank->start + bank->nr_groups)
 			break;
 	}
 	if (!bank)
 		return -EINVAL;

 	if (!bank->handler) {
 		bank->chips = kzalloc(sizeof(struct s3c_gpio_chip *) *
 				      bank->nr_groups, GFP_KERNEL);
 		if (!bank->chips)
 			return -ENOMEM;

 		irq_set_chained_handler(bank->irq, s5p_gpioint_handler);
 		irq_set_handler_data(bank->irq, bank);
 		bank->handler = s5p_gpioint_handler;
 		printk(KERN_INFO "Registered chained gpio int handler for interrupt %d.\n",
 		       bank->irq);
 	}

 	/*
 	 * chained GPIO irq has been sucessfully registered, allocate new gpio
 	 * int group and assign irq nubmers
 	 */

 	chip->irq_base = S5P_GPIOINT_BASE +
 			 used_gpioint_groups * S5P_GPIOINT_GROUP_SIZE;
 	used_gpioint_groups++;

 	bank->chips[group - bank->start] = chip;
 	for (i = 0; i < chip->chip.ngpio; i++) {
 		irq = chip->irq_base + i;
 		irq_set_chip(irq, &s5p_gpioint);
 		irq_set_handler_data(irq, chip);
 		irq_set_handler(irq, handle_level_irq);
 		set_irq_flags(irq, IRQF_VALID);
 	}
 	return 0;
 }

 int __init s5p_register_gpio_interrupt(int pin)
 {
 	struct s3c_gpio_chip *my_chip = s3c_gpiolib_getchip(pin);
 	int offset, group;
 	int ret;

 	if (!my_chip)
 		return -EINVAL;

 	offset = pin - my_chip->chip.base;
 	group = my_chip->group;

 	/* check if the group has been already registered */
 	if (my_chip->irq_base)
 		return my_chip->irq_base + offset;

 	/* register gpio group */
 	ret = s5p_gpioint_add(my_chip);
 	if (ret == 0) {
 		my_chip->chip.to_irq = samsung_gpiolib_to_irq;
 		printk(KERN_INFO "Registered interrupt support for gpio group %d.\n",
 		       group);
 		return my_chip->irq_base + offset;
 	}
 	return ret;
 }

 int __init s5p_register_gpioint_bank(int chain_irq, int start, int nr_groups)
 {
 	struct s5p_gpioint_bank *bank;

 	bank = kzalloc(sizeof(*bank), GFP_KERNEL);
 	if (!bank)
 		return -ENOMEM;

 	bank->start = start;
 	bank->nr_groups = nr_groups;
 	bank->irq = chain_irq;

 	list_add_tail(&bank->list, &banks);
 	return 0;
 }
	/* linux/arch/arm/plat-s5p/irq-gpioint.c
	*
	* Copyright (c) 2010 Samsung Electronics Co., Ltd.
	* Author: Kyungmin Park <kyungmin.park@samsung.com>
	* Author: Joonyoung Shim <jy0922.shim@samsung.com>
	* Author: Marek Szyprowski <m.szyprowski@samsung.com>
	*
	* 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.
	*
	*/

	#include <linux/kernel.h>
	#include <linux/interrupt.h>
	#include <linux/irq.h>
	#include <linux/io.h>
	#include <linux/gpio.h>
	#include <linux/slab.h>

	#include <mach/map.h>
	#include <plat/gpio-core.h>
	#include <plat/gpio-cfg.h>

	#define GPIO_BASE(chip) (((unsigned long)(chip)->base) & 0xFFFFF000u)

	#define CON_OFFSET 0x700
	#define MASK_OFFSET 0x900
	#define PEND_OFFSET 0xA00
	#define REG_OFFSET(x) ((x) << 2)

	struct s5p_gpioint_bank {
	struct list_head list;
	int start;
	int nr_groups;
	int irq;
	struct s3c_gpio_chip **chips;
	void (handler)(unsigned int, struct irq_desc );
	};

	LIST_HEAD(banks);

	static int s5p_gpioint_get_offset(struct irq_data *data)
	{
	struct s3c_gpio_chip *chip = irq_data_get_irq_handler_data(data);
	return data->irq - chip->irq_base;
	}

	static void s5p_gpioint_ack(struct irq_data *data)
	{
	struct s3c_gpio_chip *chip = irq_data_get_irq_handler_data(data);
	int group, offset, pend_offset;
	unsigned int value;

	group = chip->group;
	offset = s5p_gpioint_get_offset(data);
	pend_offset = REG_OFFSET(group);

	value = __raw_readl(GPIO_BASE(chip) + PEND_OFFSET + pend_offset);
	value \|= BIT(offset);
	__raw_writel(value, GPIO_BASE(chip) + PEND_OFFSET + pend_offset);
	}

	static void s5p_gpioint_mask(struct irq_data *data)
	{
	struct s3c_gpio_chip *chip = irq_data_get_irq_handler_data(data);
	int group, offset, mask_offset;
	unsigned int value;

	group = chip->group;
	offset = s5p_gpioint_get_offset(data);
	mask_offset = REG_OFFSET(group);

	value = __raw_readl(GPIO_BASE(chip) + MASK_OFFSET + mask_offset);
	value \|= BIT(offset);
	__raw_writel(value, GPIO_BASE(chip) + MASK_OFFSET + mask_offset);
	}

	static void s5p_gpioint_unmask(struct irq_data *data)
	{
	struct s3c_gpio_chip *chip = irq_data_get_irq_handler_data(data);
	int group, offset, mask_offset;
	unsigned int value;

	group = chip->group;
	offset = s5p_gpioint_get_offset(data);
	mask_offset = REG_OFFSET(group);

	value = __raw_readl(GPIO_BASE(chip) + MASK_OFFSET + mask_offset);
	value &= ~BIT(offset);
	__raw_writel(value, GPIO_BASE(chip) + MASK_OFFSET + mask_offset);
	}

	static void s5p_gpioint_mask_ack(struct irq_data *data)
	{
	s5p_gpioint_mask(data);
	s5p_gpioint_ack(data);
	}

	static int s5p_gpioint_set_type(struct irq_data *data, unsigned int type)
	{
	struct s3c_gpio_chip *chip = irq_data_get_irq_handler_data(data);
	int group, offset, con_offset;
	unsigned int value;

	group = chip->group;
	offset = s5p_gpioint_get_offset(data);
	con_offset = REG_OFFSET(group);

	switch (type) {
	case IRQ_TYPE_EDGE_RISING:
	type = S5P_IRQ_TYPE_EDGE_RISING;
	break;
	case IRQ_TYPE_EDGE_FALLING:
	type = S5P_IRQ_TYPE_EDGE_FALLING;
	break;
	case IRQ_TYPE_EDGE_BOTH:
	type = S5P_IRQ_TYPE_EDGE_BOTH;
	break;
	case IRQ_TYPE_LEVEL_HIGH:
	type = S5P_IRQ_TYPE_LEVEL_HIGH;
	break;
	case IRQ_TYPE_LEVEL_LOW:
	type = S5P_IRQ_TYPE_LEVEL_LOW;
	break;
	case IRQ_TYPE_NONE:
	default:
	printk(KERN_WARNING "No irq type\n");
	return -EINVAL;
	}

	value = __raw_readl(GPIO_BASE(chip) + CON_OFFSET + con_offset);
	value &= ~(0x7 << (offset * 0x4));
	value \|= (type << (offset * 0x4));
	__raw_writel(value, GPIO_BASE(chip) + CON_OFFSET + con_offset);

	return 0;
	}

	static struct irq_chip s5p_gpioint = {
	.name = "s5p_gpioint",
	.irq_ack = s5p_gpioint_ack,
	.irq_mask = s5p_gpioint_mask,
	.irq_mask_ack = s5p_gpioint_mask_ack,
	.irq_unmask = s5p_gpioint_unmask,
	.irq_set_type = s5p_gpioint_set_type,
	};

	static void s5p_gpioint_handler(unsigned int irq, struct irq_desc *desc)
	{
	struct s5p_gpioint_bank *bank = irq_get_handler_data(irq);
	int group, pend_offset, mask_offset;
	unsigned int pend, mask;

	for (group = 0; group < bank->nr_groups; group++) {
	struct s3c_gpio_chip *chip = bank->chips[group];
	if (!chip)
	continue;

	pend_offset = REG_OFFSET(group);
	pend = __raw_readl(GPIO_BASE(chip) + PEND_OFFSET + pend_offset);
	if (!pend)
	continue;

	mask_offset = REG_OFFSET(group);
	mask = __raw_readl(GPIO_BASE(chip) + MASK_OFFSET + mask_offset);
	pend &= ~mask;

	while (pend) {
	int offset = fls(pend) - 1;
	int real_irq = chip->irq_base + offset;
	generic_handle_irq(real_irq);
	pend &= ~BIT(offset);
	}
	}
	}

	static __init int s5p_gpioint_add(struct s3c_gpio_chip *chip)
	{
	static int used_gpioint_groups = 0;
	int irq, group = chip->group;
	int i;
	struct s5p_gpioint_bank *bank = NULL;

	if (used_gpioint_groups >= S5P_GPIOINT_GROUP_COUNT)
	return -ENOMEM;

	list_for_each_entry(bank, &banks, list) {
	if (group >= bank->start &&
	group < bank->start + bank->nr_groups)
	break;
	}
	if (!bank)
	return -EINVAL;

	if (!bank->handler) {
	bank->chips = kzalloc(sizeof(struct s3c_gpio_chip )
	bank->nr_groups, GFP_KERNEL);
	if (!bank->chips)
	return -ENOMEM;

	irq_set_chained_handler(bank->irq, s5p_gpioint_handler);
	irq_set_handler_data(bank->irq, bank);
	bank->handler = s5p_gpioint_handler;
	printk(KERN_INFO "Registered chained gpio int handler for interrupt %d.\n",
	bank->irq);
	}

	/*
	* chained GPIO irq has been sucessfully registered, allocate new gpio
	* int group and assign irq nubmers
	*/

	chip->irq_base = S5P_GPIOINT_BASE +
	used_gpioint_groups * S5P_GPIOINT_GROUP_SIZE;
	used_gpioint_groups++;

	bank->chips[group - bank->start] = chip;
	for (i = 0; i < chip->chip.ngpio; i++) {
	irq = chip->irq_base + i;
	irq_set_chip(irq, &s5p_gpioint);
	irq_set_handler_data(irq, chip);
	irq_set_handler(irq, handle_level_irq);
	set_irq_flags(irq, IRQF_VALID);
	}
	return 0;
	}

	int __init s5p_register_gpio_interrupt(int pin)
	{
	struct s3c_gpio_chip *my_chip = s3c_gpiolib_getchip(pin);
	int offset, group;
	int ret;

	if (!my_chip)
	return -EINVAL;

	offset = pin - my_chip->chip.base;
	group = my_chip->group;

	/* check if the group has been already registered */
	if (my_chip->irq_base)
	return my_chip->irq_base + offset;

	/* register gpio group */
	ret = s5p_gpioint_add(my_chip);
	if (ret == 0) {
	my_chip->chip.to_irq = samsung_gpiolib_to_irq;
	printk(KERN_INFO "Registered interrupt support for gpio group %d.\n",
	group);
	return my_chip->irq_base + offset;
	}
	return ret;
	}

	int __init s5p_register_gpioint_bank(int chain_irq, int start, int nr_groups)
	{
	struct s5p_gpioint_bank *bank;

	bank = kzalloc(sizeof(*bank), GFP_KERNEL);
	if (!bank)
	return -ENOMEM;

	bank->start = start;
	bank->nr_groups = nr_groups;
	bank->irq = chain_irq;

	list_add_tail(&bank->list, &banks);
	return 0;
	}