Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit a3b8d4a5 authored by Alexander Shiyan's avatar Alexander Shiyan Committed by Linus Walleij
Browse files

GPIO: Add support for GPIO on CLPS711X-target platform 



The CLPS711X CPUs provide some GPIOs for use in the system. This
driver provides support for these via gpiolib. Due to platform
limitations, driver does not support interrupts, only inputs and
outputs.

Signed-off-by: default avatarAlexander Shiyan <shc_work@mail.ru>
Acked-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent 04ed4279

arch/arm/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -364,6 +364,7 @@ config ARCH_CNS3XXX 


config ARCH_CLPS711X

	bool "Cirrus Logic CLPS711x/EP721x/EP731x-based"

	select ARCH_REQUIRE_GPIOLIB

	select ARCH_USES_GETTIMEOFFSET

	select CLKDEV_LOOKUP

	select COMMON_CLK

arch/arm/mach-clps711x/include/mach/gpio.h

0 → 100644
+13 −0
Original line number Diff line number Diff line 
/*

 *  This file contains the CLPS711X GPIO definitions.

 *

 *  Copyright (C) 2012 Alexander Shiyan <shc_work@mail.ru>

 *

 * 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.

 */



/* Simple helper for convert port & pin to GPIO number */

#define CLPS711X_GPIO(port, bit)	((port) * 8 + (bit))

drivers/gpio/Kconfig

+4 −0
Original line number Diff line number Diff line
@@ -102,6 +102,10 @@ config GPIO_MAX730X 


comment "Memory mapped GPIO drivers:"



config GPIO_CLPS711X

	def_bool y

	depends on ARCH_CLPS711X



config GPIO_GENERIC_PLATFORM

	tristate "Generic memory-mapped GPIO controller support (MMIO platform device)"

	select GPIO_GENERIC

drivers/gpio/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -16,6 +16,7 @@ obj-$(CONFIG_GPIO_ADP5588) += gpio-adp5588.o 
obj-$(CONFIG_GPIO_AMD8111)	+= gpio-amd8111.o

obj-$(CONFIG_GPIO_ARIZONA)	+= gpio-arizona.o

obj-$(CONFIG_GPIO_BT8XX)	+= gpio-bt8xx.o

obj-$(CONFIG_GPIO_CLPS711X)	+= gpio-clps711x.o

obj-$(CONFIG_GPIO_CS5535)	+= gpio-cs5535.o

obj-$(CONFIG_GPIO_DA9052)	+= gpio-da9052.o

obj-$(CONFIG_GPIO_DA9055)	+= gpio-da9055.o

drivers/gpio/gpio-clps711x.c

0 → 100644
+163 −0
Original line number Diff line number Diff line 
/*

 *  CLPS711X GPIO driver

 *

 *  Copyright (C) 2012 Alexander Shiyan <shc_work@mail.ru>

 *

 * 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/io.h>

#include <linux/slab.h>

#include <linux/gpio.h>

#include <linux/module.h>

#include <linux/spinlock.h>

#include <linux/platform_device.h>



#include <mach/hardware.h>



#define CLPS711X_GPIO_PORTS	5

#define CLPS711X_GPIO_NAME	"gpio-clps711x"



struct clps711x_gpio {

	struct gpio_chip	chip[CLPS711X_GPIO_PORTS];

	spinlock_t		lock;

};



static void __iomem *clps711x_ports[] = {

	CLPS711X_VIRT_BASE + PADR,

	CLPS711X_VIRT_BASE + PBDR,

	CLPS711X_VIRT_BASE + PCDR,

	CLPS711X_VIRT_BASE + PDDR,

	CLPS711X_VIRT_BASE + PEDR,

};



static void __iomem *clps711x_pdirs[] = {

	CLPS711X_VIRT_BASE + PADDR,

	CLPS711X_VIRT_BASE + PBDDR,

	CLPS711X_VIRT_BASE + PCDDR,

	CLPS711X_VIRT_BASE + PDDDR,

	CLPS711X_VIRT_BASE + PEDDR,

};



#define clps711x_port(x)	clps711x_ports[x->base / 8]

#define clps711x_pdir(x)	clps711x_pdirs[x->base / 8]



static int gpio_clps711x_get(struct gpio_chip *chip, unsigned offset)

{

	return !!readb(clps711x_port(chip)) & (1 << offset);

}



static void gpio_clps711x_set(struct gpio_chip *chip, unsigned offset,

			      int value)

{

	int tmp;

	unsigned long flags;

	struct clps711x_gpio *gpio = dev_get_drvdata(chip->dev);



	spin_lock_irqsave(&gpio->lock, flags);

	tmp = readb(clps711x_port(chip)) & ~(1 << offset);

	if (value)

		tmp |= 1 << offset;

	writeb(tmp, clps711x_port(chip));

	spin_unlock_irqrestore(&gpio->lock, flags);

}



static int gpio_clps711x_direction_in(struct gpio_chip *chip, unsigned offset)

{

	int tmp;

	unsigned long flags;

	struct clps711x_gpio *gpio = dev_get_drvdata(chip->dev);



	spin_lock_irqsave(&gpio->lock, flags);

	tmp = readb(clps711x_pdir(chip)) & ~(1 << offset);

	writeb(tmp, clps711x_pdir(chip));

	spin_unlock_irqrestore(&gpio->lock, flags);



	return 0;

}



static int gpio_clps711x_direction_out(struct gpio_chip *chip, unsigned offset,

				       int value)

{

	int tmp;

	unsigned long flags;

	struct clps711x_gpio *gpio = dev_get_drvdata(chip->dev);



	spin_lock_irqsave(&gpio->lock, flags);

	tmp = readb(clps711x_pdir(chip)) | (1 << offset);

	writeb(tmp, clps711x_pdir(chip));

	tmp = readb(clps711x_port(chip)) & ~(1 << offset);

	if (value)

		tmp |= 1 << offset;

	writeb(tmp, clps711x_port(chip));

	spin_unlock_irqrestore(&gpio->lock, flags);



	return 0;

}



struct clps711x_gpio_port {

	char	*name;

	int	nr;

};



static const struct clps711x_gpio_port clps711x_gpio_ports[] __initconst = {

	{ "PORTA", 8, },

	{ "PORTB", 8, },

	{ "PORTC", 8, },

	{ "PORTD", 8, },

	{ "PORTE", 3, },

};



static int __init gpio_clps711x_init(void)

{

	int i;

	struct platform_device *pdev;

	struct clps711x_gpio *gpio;



	pdev = platform_device_alloc(CLPS711X_GPIO_NAME, 0);

	if (!pdev) {

		pr_err("Cannot create platform device: %s\n",

		       CLPS711X_GPIO_NAME);

		return -ENOMEM;

	}



	platform_device_add(pdev);



	gpio = devm_kzalloc(&pdev->dev, sizeof(struct clps711x_gpio),

			    GFP_KERNEL);

	if (!gpio) {

		dev_err(&pdev->dev, "GPIO allocating memory error\n");

		platform_device_del(pdev);

		platform_device_put(pdev);

		return -ENOMEM;

	}



	platform_set_drvdata(pdev, gpio);



	spin_lock_init(&gpio->lock);



	for (i = 0; i < CLPS711X_GPIO_PORTS; i++) {

		gpio->chip[i].owner		= THIS_MODULE;

		gpio->chip[i].dev		= &pdev->dev;

		gpio->chip[i].label		= clps711x_gpio_ports[i].name;

		gpio->chip[i].base		= i * 8;

		gpio->chip[i].ngpio		= clps711x_gpio_ports[i].nr;

		gpio->chip[i].direction_input	= gpio_clps711x_direction_in;

		gpio->chip[i].get		= gpio_clps711x_get;

		gpio->chip[i].direction_output	= gpio_clps711x_direction_out;

		gpio->chip[i].set		= gpio_clps711x_set;

		WARN_ON(gpiochip_add(&gpio->chip[i]));

	}



	dev_info(&pdev->dev, "GPIO driver initialized\n");



	return 0;

}

arch_initcall(gpio_clps711x_init);



MODULE_LICENSE("GPL v2");

MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");

MODULE_DESCRIPTION("CLPS711X GPIO driver");