path: root/drivers/pinctrl/pinctrl-exynos.c

/*
 * Exynos specific support for Samsung pinctrl/gpiolib driver with eint support.
 *
 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
 *		http://www.samsung.com
 * Copyright (c) 2012 Linaro Ltd
 *		http://www.linaro.org
 *
 * Author: Thomas Abraham <thomas.ab@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.
 *
 * This file contains the Samsung Exynos specific information required by the
 * the Samsung pinctrl/gpiolib driver. It also includes the implementation of
 * external gpio and wakeup interrupt support.
 */

#include <linux/module.h>
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/irqdomain.h>
#include <linux/irq.h>
#include <linux/irqchip/chained_irq.h>
#include <linux/of_irq.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/err.h>

#include "pinctrl-samsung.h"
#include "pinctrl-exynos.h"


static struct samsung_pin_bank_type bank_type_off = {
	.fld_width = { 4, 1, 2, 2, 2, 2, },
	.reg_offset = { 0x00, 0x04, 0x08, 0x0c, 0x10, 0x14, },
};

static struct samsung_pin_bank_type bank_type_alive = {
	.fld_width = { 4, 1, 2, 2, },
	.reg_offset = { 0x00, 0x04, 0x08, 0x0c, },
};

/* list of external wakeup controllers supported */
static const struct of_device_id exynos_wkup_irq_ids[] = {
	{ .compatible = "samsung,exynos4210-wakeup-eint", },
	{ }
};

static void exynos_gpio_irq_mask(struct irq_data *irqd)
{
	struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(irqd);
	struct samsung_pinctrl_drv_data *d = bank->drvdata;
	unsigned long reg_mask = d->ctrl->geint_mask + bank->eint_offset;
	unsigned long mask;
	unsigned long flags;

	spin_lock_irqsave(&bank->slock, flags);

	mask = readl(d->virt_base + reg_mask);
	mask |= 1 << irqd->hwirq;
	writel(mask, d->virt_base + reg_mask);

	spin_unlock_irqrestore(&bank->slock, flags);
}

static void exynos_gpio_irq_ack(struct irq_data *irqd)
{
	struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(irqd);
	struct samsung_pinctrl_drv_data *d = bank->drvdata;
	unsigned long reg_pend = d->ctrl->geint_pend + bank->eint_offset;

	writel(1 << irqd->hwirq, d->virt_base + reg_pend);
}

static void exynos_gpio_irq_unmask(struct irq_data *irqd)
{
	struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(irqd);
	struct samsung_pinctrl_drv_data *d = bank->drvdata;
	unsigned long reg_mask = d->ctrl->geint_mask + bank->eint_offset;
	unsigned long mask;
	unsigned long flags;

	/*
	 * Ack level interrupts right before unmask
	 *
	 * If we don't do this we'll get a double-interrupt.  Level triggered
	 * interrupts must not fire an interrupt if the level is not
	 * _currently_ active, even if it was active while the interrupt was
	 * masked.
	 */
	if (irqd_get_trigger_type(irqd) & IRQ_TYPE_LEVEL_MASK)
		exynos_gpio_irq_ack(irqd);

	spin_lock_irqsave(&bank->slock, flags);

	mask = readl(d->virt_base + reg_mask);
	mask &= ~(1 << irqd->hwirq);
	writel(mask, d->virt_base + reg_mask