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

Commit 5041e791 authored by Julien Grossholtz's avatar Julien Grossholtz Committed by Linus Walleij
Browse files

gpio: add TS-4800 fpga GPIO support 



The TS-4800 GPIO driver provide support for the GPIOs available
on the Technologic Sytems board FPGA. It allows to set
direction and read/write states.

It uses the generic gpio driver.

Signed-off-by: default avatarJulien Grossholtz <julien.grossholtz@savoirfairelinux.com>
Reviewed-by: default avatarAlexandre Courbot <acourbot@nvidia.com>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent 9cd56ab8

drivers/gpio/Kconfig

+7 −0
Original line number Diff line number Diff line
@@ -382,6 +382,13 @@ config GPIO_TB10X 
	select GENERIC_IRQ_CHIP

	select OF_GPIO



config GPIO_TS4800

	tristate "TS-4800 DIO blocks and compatibles"

	depends on OF_GPIO

	select GPIO_GENERIC

	help

	  This driver support TS-4800 FPGA GPIO controllers.



config GPIO_TZ1090

	bool "Toumaz Xenif TZ1090 GPIO support"

	depends on SOC_TZ1090

drivers/gpio/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -99,6 +99,7 @@ obj-$(CONFIG_GPIO_PALMAS) += gpio-palmas.o 
obj-$(CONFIG_GPIO_TPS6586X)	+= gpio-tps6586x.o

obj-$(CONFIG_GPIO_TPS65910)	+= gpio-tps65910.o

obj-$(CONFIG_GPIO_TPS65912)	+= gpio-tps65912.o

obj-$(CONFIG_GPIO_TS4800)	+= gpio-ts4800.o

obj-$(CONFIG_GPIO_TS5500)	+= gpio-ts5500.o

obj-$(CONFIG_GPIO_TWL4030)	+= gpio-twl4030.o

obj-$(CONFIG_GPIO_TWL6040)	+= gpio-twl6040.o

drivers/gpio/gpio-ts4800.c

0 → 100644
+94 −0
Original line number Diff line number Diff line 
/*

 * GPIO driver for the TS-4800 board

 *

 * Copyright (c) 2016 - Savoir-faire Linux

 *

 * This file is licensed under the terms of the GNU General Public

 * License version 2. This program is licensed "as is" without any

 * warranty of any kind, whether express or implied.

 */



#include <linux/gpio/driver.h>

#include <linux/of_address.h>

#include <linux/of_device.h>

#include <linux/platform_device.h>



#define DEFAULT_PIN_NUMBER      16

#define INPUT_REG_OFFSET        0x00

#define OUTPUT_REG_OFFSET       0x02

#define DIRECTION_REG_OFFSET    0x04



static int ts4800_gpio_probe(struct platform_device *pdev)

{

	struct device_node *node;

	struct gpio_chip *chip;

	struct resource *res;

	void __iomem *base_addr;

	int retval;

	u32 ngpios;



	chip = devm_kzalloc(&pdev->dev, sizeof(struct gpio_chip), GFP_KERNEL);

	if (!chip)

		return -ENOMEM;



	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	base_addr = devm_ioremap_resource(&pdev->dev, res);

	if (IS_ERR(base_addr))

		return PTR_ERR(base_addr);



	node = pdev->dev.of_node;

	if (!node)

		return -EINVAL;



	retval = of_property_read_u32(node, "ngpios", &ngpios);

	if (retval == -EINVAL)

		ngpios = DEFAULT_PIN_NUMBER;

	else if (retval)

		return retval;



	retval = bgpio_init(chip, &pdev->dev, 2, base_addr + INPUT_REG_OFFSET,

			    base_addr + OUTPUT_REG_OFFSET, NULL,

			    base_addr + DIRECTION_REG_OFFSET, NULL,

			    BGPIOF_BIG_ENDIAN & BGPIOF_BIG_ENDIAN_BYTE_ORDER);

	if (retval) {

		dev_err(&pdev->dev, "bgpio_init failed\n");

		return retval;

	}



	chip->base = -1;

	chip->label = dev_name(&pdev->dev);

	chip->ngpio = ngpios;



	platform_set_drvdata(pdev, chip);



	return gpiochip_add_data(chip, NULL);

}



static int ts4800_gpio_remove(struct platform_device *pdev)

{

	struct gpio_chip *chip = platform_get_drvdata(pdev);



	gpiochip_remove(chip);



	return 0;

}



static const struct of_device_id ts4800_gpio_of_match[] = {

	{ .compatible = "technologic,ts4800-gpio", },

	{},

};



static struct platform_driver ts4800_gpio_driver = {

	.driver = {

		   .name = "ts4800-gpio",

		   .of_match_table = ts4800_gpio_of_match,

		   },

	.probe = ts4800_gpio_probe,

	.remove = ts4800_gpio_remove,

};



module_platform_driver_probe(ts4800_gpio_driver, ts4800_gpio_probe);



MODULE_AUTHOR("Julien Grossholtz <julien.grossholtz@savoirfairelinux.com>");

MODULE_DESCRIPTION("TS4800 FPGA GPIO driver");

MODULE_LICENSE("GPL v2");