gpio: msm: Remove unused driver

MSM GPIO controller bindings

Required properties:

- compatible:

  - "qcom,msm-gpio" for MSM controllers

- #gpio-cells : Should be two.

  - first cell is the pin number

  - second cell is used to specify optional parameters (unused)

- gpio-controller : Marks the device node as a GPIO controller.

- #interrupt-cells : Should be 2.

- interrupt-controller: Mark the device node as an interrupt controller

- interrupts : Specify the TLMM summary interrupt number

- ngpio : Specify the number of MSM GPIOs

Example:

	msmgpio: gpio@fd510000 {

		compatible = "qcom,msm-gpio";

		gpio-controller;

		#gpio-cells = <2>;

		interrupt-controller;

		#interrupt-cells = <2>;

		reg = <0xfd510000 0x4000>;

		interrupts = <0 208 0>;

		ngpio = <150>;

	};

	  Say Y here if you're going to use hardware that connects to the

	  MPC512x/831x/834x/837x/8572/8610 GPIOs.

config GPIO_MSM_V2

	tristate "Qualcomm MSM GPIO v2"

	depends on GPIOLIB && OF && ARCH_QCOM

	help

	  Say yes here to support the GPIO interface on ARM v7 based

	  Qualcomm MSM chips.  Most of the pins on the MSM can be

	  selected for GPIO, and are controlled by this driver.

config GPIO_MVEBU

	def_bool y

	depends on PLAT_ORION

obj-$(CONFIG_GPIO_MPC5200)	+= gpio-mpc5200.o

obj-$(CONFIG_GPIO_MPC8XXX)	+= gpio-mpc8xxx.o

obj-$(CONFIG_GPIO_MSIC)		+= gpio-msic.o

obj-$(CONFIG_GPIO_MSM_V2)	+= gpio-msm-v2.o

obj-$(CONFIG_GPIO_MVEBU)        += gpio-mvebu.o

obj-$(CONFIG_GPIO_MXC)		+= gpio-mxc.o

obj-$(CONFIG_GPIO_MXS)		+= gpio-mxs.o

/* Copyright (c) 2010-2011, Code Aurora Forum. 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 version 2 and

 * only version 2 as published by the Free Software Foundation.

 *

 * 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.

 *

 */

#define pr_fmt(fmt) "%s: " fmt, __func__

#include <linux/bitmap.h>

#include <linux/bitops.h>

#include <linux/err.h>

#include <linux/gpio.h>

#include <linux/init.h>

#include <linux/interrupt.h>

#include <linux/io.h>

#include <linux/irqchip/chained_irq.h>

#include <linux/irq.h>

#include <linux/irqdomain.h>

#include <linux/module.h>

#include <linux/of_address.h>

#include <linux/platform_device.h>

#include <linux/spinlock.h>

#include <linux/slab.h>

#define MAX_NR_GPIO 300

/* Bits of interest in the GPIO_IN_OUT register.

 */

enum {

	GPIO_IN  = 0,

	GPIO_OUT = 1

};

/* Bits of interest in the GPIO_INTR_STATUS register.

 */

enum {

	INTR_STATUS = 0,

};

/* Bits of interest in the GPIO_CFG register.

 */

enum {

	GPIO_OE = 9,

};

/* Bits of interest in the GPIO_INTR_CFG register.

 * When a GPIO triggers, two separate decisions are made, controlled

 * by two separate flags.

 *

 * - First, INTR_RAW_STATUS_EN controls whether or not the GPIO_INTR_STATUS

 * register for that GPIO will be updated to reflect the triggering of that

 * gpio.  If this bit is 0, this register will not be updated.

 * - Second, INTR_ENABLE controls whether an interrupt is triggered.

 *

 * If INTR_ENABLE is set and INTR_RAW_STATUS_EN is NOT set, an interrupt

 * can be triggered but the status register will not reflect it.

 */

enum {

	INTR_ENABLE        = 0,

	INTR_POL_CTL       = 1,

	INTR_DECT_CTL      = 2,

	INTR_RAW_STATUS_EN = 3,

};

/* Codes of interest in GPIO_INTR_CFG_SU.

 */

enum {

	TARGET_PROC_SCORPION = 4,

	TARGET_PROC_NONE     = 7,

};

/**

 * struct msm_gpio_dev: the MSM8660 SoC GPIO device structure

 *

 * @enabled_irqs: a bitmap used to optimize the summary-irq handler.  By

 * keeping track of which gpios are unmasked as irq sources, we avoid

 * having to do readl calls on hundreds of iomapped registers each time

 * the summary interrupt fires in order to locate the active interrupts.

 *

 * @wake_irqs: a bitmap for tracking which interrupt lines are enabled

 * as wakeup sources.  When the device is suspended, interrupts which are

 * not wakeup sources are disabled.

 *

 * @dual_edge_irqs: a bitmap used to track which irqs are configured

 * as dual-edge, as this is not supported by the hardware and requires

 * some special handling in the driver.

 */

struct msm_gpio_dev {

	struct gpio_chip gpio_chip;

	DECLARE_BITMAP(enabled_irqs, MAX_NR_GPIO);

	DECLARE_BITMAP(wake_irqs, MAX_NR_GPIO);

	DECLARE_BITMAP(dual_edge_irqs, MAX_NR_GPIO);

	struct irq_domain *domain;

	int summary_irq;

	void __iomem *msm_tlmm_base;

};

static struct msm_gpio_dev msm_gpio;

#define GPIO_INTR_CFG_SU(gpio)    (msm_gpio.msm_tlmm_base + 0x0400 + \

								(0x04 * (gpio)))

#define GPIO_CONFIG(gpio)         (msm_gpio.msm_tlmm_base + 0x1000 + \

								(0x10 * (gpio)))

#define GPIO_IN_OUT(gpio)         (msm_gpio.msm_tlmm_base + 0x1004 + \

								(0x10 * (gpio)))

#define GPIO_INTR_CFG(gpio)       (msm_gpio.msm_tlmm_base + 0x1008 + \

								(0x10 * (gpio)))

#define GPIO_INTR_STATUS(gpio)    (msm_gpio.msm_tlmm_base + 0x100c + \

								(0x10 * (gpio)))

static DEFINE_SPINLOCK(tlmm_lock);

static inline struct msm_gpio_dev *to_msm_gpio_dev(struct gpio_chip *chip)

{

	return container_of(chip, struct msm_gpio_dev, gpio_chip);

}

static inline void set_gpio_bits(unsigned n, void __iomem *reg)

{

	writel(readl(reg) | n, reg);

}

static inline void clear_gpio_bits(unsigned n, void __iomem *reg)

{

	writel(readl(reg) & ~n, reg);

}

static int msm_gpio_get(struct gpio_chip *chip, unsigned offset)

{

	return readl(GPIO_IN_OUT(offset)) & BIT(GPIO_IN);

}

static void msm_gpio_set(struct gpio_chip *chip, unsigned offset, int val)

{

	writel(val ? BIT(GPIO_OUT) : 0, GPIO_IN_OUT(offset));

}

static int msm_gpio_direction_input(struct gpio_chip *chip, unsigned offset)

{

	unsigned long irq_flags;

	spin_lock_irqsave(&tlmm_lock, irq_flags);

	clear_gpio_bits(BIT(GPIO_OE), GPIO_CONFIG(offset));

	spin_unlock_irqrestore(&tlmm_lock, irq_flags);

	return 0;

}

static int msm_gpio_direction_output(struct gpio_chip *chip,

				unsigned offset,

				int val)

{

	unsigned long irq_flags;

	spin_lock_irqsave(&tlmm_lock, irq_flags);

	msm_gpio_set(chip, offset, val);

	set_gpio_bits(BIT(GPIO_OE), GPIO_CONFIG(offset));

	spin_unlock_irqrestore(&tlmm_lock, irq_flags);

	return 0;

}

static int msm_gpio_request(struct gpio_chip *chip, unsigned offset)

{

	return 0;

}

static void msm_gpio_free(struct gpio_chip *chip, unsigned offset)

{

	return;

}

static int msm_gpio_to_irq(struct gpio_chip *chip, unsigned offset)

{

	struct msm_gpio_dev *g_dev = to_msm_gpio_dev(chip);

	struct irq_domain *domain = g_dev->domain;

	return irq_create_mapping(domain, offset);

}

/* For dual-edge interrupts in software, since the hardware has no

 * such support:

 *

 * At appropriate moments, this function may be called to flip the polarity

 * settings of both-edge irq lines to try and catch the next edge.

 *

 * The attempt is considered successful if:

 * - the status bit goes high, indicating that an edge was caught, or

 * - the input value of the gpio doesn't change during the attempt.

 * If the value changes twice during the process, that would cause the first

 * test to fail but would force the second, as two opposite

 * transitions would cause a detection no matter the polarity setting.

 *

 * The do-loop tries to sledge-hammer closed the timing hole between

 * the initial value-read and the polarity-write - if the line value changes

 * during that window, an interrupt is lost, the new polarity setting is

 * incorrect, and the first success test will fail, causing a retry.

 *

 * Algorithm comes from Google's msmgpio driver, see mach-msm/gpio.c.

 */

static void msm_gpio_update_dual_edge_pos(unsigned gpio)

{

	int loop_limit = 100;

	unsigned val, val2, intstat;

	do {

		val = readl(GPIO_IN_OUT(gpio)) & BIT(GPIO_IN);

		if (val)

			clear_gpio_bits(BIT(INTR_POL_CTL), GPIO_INTR_CFG(gpio));

		else

			set_gpio_bits(BIT(INTR_POL_CTL), GPIO_INTR_CFG(gpio));

		val2 = readl(GPIO_IN_OUT(gpio)) & BIT(GPIO_IN);

		intstat = readl(GPIO_INTR_STATUS(gpio)) & BIT(INTR_STATUS);

		if (intstat || val == val2)

			return;

	} while (loop_limit-- > 0);

	pr_err("%s: dual-edge irq failed to stabilize, "

	       "interrupts dropped. %#08x != %#08x\n",

	       __func__, val, val2);

}

static void msm_gpio_irq_ack(struct irq_data *d)

{

	int gpio = d->hwirq;

	writel(BIT(INTR_STATUS), GPIO_INTR_STATUS(gpio));

	if (test_bit(gpio, msm_gpio.dual_edge_irqs))

		msm_gpio_update_dual_edge_pos(gpio);

}

static void msm_gpio_irq_mask(struct irq_data *d)

{

	unsigned long irq_flags;

	int gpio = d->hwirq;

	spin_lock_irqsave(&tlmm_lock, irq_flags);

	writel(TARGET_PROC_NONE, GPIO_INTR_CFG_SU(gpio));

	clear_gpio_bits(BIT(INTR_RAW_STATUS_EN) | BIT(INTR_ENABLE), GPIO_INTR_CFG(gpio));

	__clear_bit(gpio, msm_gpio.enabled_irqs);

	spin_unlock_irqrestore(&tlmm_lock, irq_flags);

}

static void msm_gpio_irq_unmask(struct irq_data *d)

{

	unsigned long irq_flags;

	int gpio = d->hwirq;

	spin_lock_irqsave(&tlmm_lock, irq_flags);

	__set_bit(gpio, msm_gpio.enabled_irqs);

	set_gpio_bits(BIT(INTR_RAW_STATUS_EN) | BIT(INTR_ENABLE), GPIO_INTR_CFG(gpio));

	writel(TARGET_PROC_SCORPION, GPIO_INTR_CFG_SU(gpio));

	spin_unlock_irqrestore(&tlmm_lock, irq_flags);

}

static int msm_gpio_irq_set_type(struct irq_data *d, unsigned int flow_type)

{

	unsigned long irq_flags;

	int gpio = d->hwirq;

	uint32_t bits;

	spin_lock_irqsave(&tlmm_lock, irq_flags);

	bits = readl(GPIO_INTR_CFG(gpio));

	if (flow_type & IRQ_TYPE_EDGE_BOTH) {

		bits |= BIT(INTR_DECT_CTL);

		irq_set_handler_locked(d, handle_edge_irq);

		if ((flow_type & IRQ_TYPE_EDGE_BOTH) == IRQ_TYPE_EDGE_BOTH)

			__set_bit(gpio, msm_gpio.dual_edge_irqs);

		else

			__clear_bit(gpio, msm_gpio.dual_edge_irqs);

	} else {

		bits &= ~BIT(INTR_DECT_CTL);

		irq_set_handler_locked(d, handle_level_irq);

		__clear_bit(gpio, msm_gpio.dual_edge_irqs);

	}

	if (flow_type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_LEVEL_HIGH))

		bits |= BIT(INTR_POL_CTL);

	else

		bits &= ~BIT(INTR_POL_CTL);

	writel(bits, GPIO_INTR_CFG(gpio));

	if ((flow_type & IRQ_TYPE_EDGE_BOTH) == IRQ_TYPE_EDGE_BOTH)

		msm_gpio_update_dual_edge_pos(gpio);

	spin_unlock_irqrestore(&tlmm_lock, irq_flags);

	return 0;

}

/*

 * When the summary IRQ is raised, any number of GPIO lines may be high.

 * It is the job of the summary handler to find all those GPIO lines

 * which have been set as summary IRQ lines and which are triggered,

 * and to call their interrupt handlers.

 */

static void msm_summary_irq_handler(struct irq_desc *desc)

{

	unsigned long i;

	struct irq_chip *chip = irq_desc_get_chip(desc);

	chained_irq_enter(chip, desc);

	for_each_set_bit(i, msm_gpio.enabled_irqs, MAX_NR_GPIO) {

		if (readl(GPIO_INTR_STATUS(i)) & BIT(INTR_STATUS))

			generic_handle_irq(irq_find_mapping(msm_gpio.domain,

								i));

	}

	chained_irq_exit(chip, desc);

}

static int msm_gpio_irq_set_wake(struct irq_data *d, unsigned int on)

{

	int gpio = d->hwirq;

	if (on) {

		if (bitmap_empty(msm_gpio.wake_irqs, MAX_NR_GPIO))

			irq_set_irq_wake(msm_gpio.summary_irq, 1);

		set_bit(gpio, msm_gpio.wake_irqs);

	} else {

		clear_bit(gpio, msm_gpio.wake_irqs);

		if (bitmap_empty(msm_gpio.wake_irqs, MAX_NR_GPIO))

			irq_set_irq_wake(msm_gpio.summary_irq, 0);

	}

	return 0;

}

static struct irq_chip msm_gpio_irq_chip = {

	.name		= "msmgpio",

	.irq_mask	= msm_gpio_irq_mask,

	.irq_unmask	= msm_gpio_irq_unmask,

	.irq_ack	= msm_gpio_irq_ack,

	.irq_set_type	= msm_gpio_irq_set_type,

	.irq_set_wake	= msm_gpio_irq_set_wake,

};

static struct lock_class_key msm_gpio_lock_class;

static int msm_gpio_irq_domain_map(struct irq_domain *d, unsigned int irq,

				   irq_hw_number_t hwirq)

{

	irq_set_lockdep_class(irq, &msm_gpio_lock_class);

	irq_set_chip_and_handler(irq, &msm_gpio_irq_chip,

			handle_level_irq);

	return 0;

}

static const struct irq_domain_ops msm_gpio_irq_domain_ops = {

	.xlate = irq_domain_xlate_twocell,

	.map = msm_gpio_irq_domain_map,

};

static int msm_gpio_probe(struct platform_device *pdev)

{

	int ret, ngpio;

	struct resource *res;

	if (of_property_read_u32(pdev->dev.of_node, "ngpio", &ngpio)) {

		dev_err(&pdev->dev, "%s: ngpio property missing\n", __func__);

		return -EINVAL;

	}

	if (ngpio > MAX_NR_GPIO)

		WARN(1, "ngpio exceeds the MAX_NR_GPIO. Increase MAX_NR_GPIO\n");

	bitmap_zero(msm_gpio.enabled_irqs, MAX_NR_GPIO);

	bitmap_zero(msm_gpio.wake_irqs, MAX_NR_GPIO);

	bitmap_zero(msm_gpio.dual_edge_irqs, MAX_NR_GPIO);

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	msm_gpio.msm_tlmm_base = devm_ioremap_resource(&pdev->dev, res);

	if (IS_ERR(msm_gpio.msm_tlmm_base))

		return PTR_ERR(msm_gpio.msm_tlmm_base);

	msm_gpio.gpio_chip.ngpio = ngpio;

	msm_gpio.gpio_chip.label = pdev->name;

	msm_gpio.gpio_chip.dev = &pdev->dev;

	msm_gpio.gpio_chip.base = 0;

	msm_gpio.gpio_chip.direction_input = msm_gpio_direction_input;

	msm_gpio.gpio_chip.direction_output = msm_gpio_direction_output;

	msm_gpio.gpio_chip.get = msm_gpio_get;

	msm_gpio.gpio_chip.set = msm_gpio_set;

	msm_gpio.gpio_chip.to_irq = msm_gpio_to_irq;

	msm_gpio.gpio_chip.request = msm_gpio_request;

	msm_gpio.gpio_chip.free = msm_gpio_free;

	ret = gpiochip_add(&msm_gpio.gpio_chip);

	if (ret < 0) {

		dev_err(&pdev->dev, "gpiochip_add failed with error %d\n", ret);

		return ret;

	}

	msm_gpio.summary_irq = platform_get_irq(pdev, 0);

	if (msm_gpio.summary_irq < 0) {

		dev_err(&pdev->dev, "No Summary irq defined for msmgpio\n");

		return msm_gpio.summary_irq;

	}

	msm_gpio.domain = irq_domain_add_linear(pdev->dev.of_node, ngpio,

						&msm_gpio_irq_domain_ops,

						&msm_gpio);

	if (!msm_gpio.domain)

		return -ENODEV;

	irq_set_chained_handler(msm_gpio.summary_irq, msm_summary_irq_handler);

	return 0;

}

static const struct of_device_id msm_gpio_of_match[] = {

	{ .compatible = "qcom,msm-gpio", },

	{ },

};

MODULE_DEVICE_TABLE(of, msm_gpio_of_match);

static int msm_gpio_remove(struct platform_device *dev)

{

	gpiochip_remove(&msm_gpio.gpio_chip);

	irq_set_handler(msm_gpio.summary_irq, NULL);

	return 0;

}

static struct platform_driver msm_gpio_driver = {

	.probe = msm_gpio_probe,

	.remove = msm_gpio_remove,

	.driver = {

		.name = "msmgpio",

		.of_match_table = msm_gpio_of_match,

	},

};

module_platform_driver(msm_gpio_driver)

MODULE_AUTHOR("Gregory Bean <gbean@codeaurora.org>");

MODULE_DESCRIPTION("Driver for Qualcomm MSM TLMMv2 SoC GPIOs");

MODULE_LICENSE("GPL v2");

MODULE_ALIAS("platform:msmgpio");