Commit b7536d87 authored by Michael Walle's avatar Michael Walle Committed by Lee Jones
Browse files

gpio: Add support for the sl28cpld GPIO controller 



Add support for the GPIO controller of the sl28 board management
controller. This driver is part of a multi-function device.

A controller has 8 lines. There are three different flavors:
full-featured GPIO with interrupt support, input-only and output-only.

Signed-off-by: default avatarMichael Walle <michael@walle.cc>
Reviewed-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Reviewed-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: default avatarLee Jones <lee.jones@linaro.org>
parent 9db33d22

drivers/gpio/Kconfig

+12 −0
Original line number Diff line number Diff line
@@ -1223,6 +1223,18 @@ config GPIO_RC5T583 
	  This driver provides the support for driving/reading the gpio pins

	  of RC5T583 device through standard gpio library.



config GPIO_SL28CPLD

	tristate "Kontron sl28cpld GPIO support"

	depends on MFD_SL28CPLD || COMPILE_TEST

	select GPIO_REGMAP

	select GPIOLIB_IRQCHIP

	select REGMAP_IRQ

	help

	  This enables support for the GPIOs found on the Kontron sl28 CPLD.



	  This driver can also be built as a module. If so, the module will be

	  called gpio-sl28cpld.



config GPIO_STMPE

	bool "STMPE GPIOs"

	depends on MFD_STMPE

drivers/gpio/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -132,6 +132,7 @@ obj-$(CONFIG_GPIO_SCH311X) += gpio-sch311x.o 
obj-$(CONFIG_GPIO_SCH)			+= gpio-sch.o

obj-$(CONFIG_GPIO_SIFIVE)		+= gpio-sifive.o

obj-$(CONFIG_GPIO_SIOX)			+= gpio-siox.o

obj-$(CONFIG_GPIO_SL28CPLD)		+= gpio-sl28cpld.o

obj-$(CONFIG_GPIO_SODAVILLE)		+= gpio-sodaville.o

obj-$(CONFIG_GPIO_SPEAR_SPICS)		+= gpio-spear-spics.o

obj-$(CONFIG_GPIO_SPRD)			+= gpio-sprd.o

drivers/gpio/gpio-sl28cpld.c

0 → 100644
+161 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0-only

/*

 * sl28cpld GPIO driver

 *

 * Copyright 2020 Michael Walle <michael@walle.cc>

 */



#include <linux/device.h>

#include <linux/gpio/driver.h>

#include <linux/gpio/regmap.h>

#include <linux/interrupt.h>

#include <linux/kernel.h>

#include <linux/mod_devicetable.h>

#include <linux/module.h>

#include <linux/platform_device.h>

#include <linux/regmap.h>



/* GPIO flavor */

#define GPIO_REG_DIR	0x00

#define GPIO_REG_OUT	0x01

#define GPIO_REG_IN	0x02

#define GPIO_REG_IE	0x03

#define GPIO_REG_IP	0x04



/* input-only flavor */

#define GPI_REG_IN	0x00



/* output-only flavor */

#define GPO_REG_OUT	0x00



enum sl28cpld_gpio_type {

	SL28CPLD_GPIO = 1,

	SL28CPLD_GPI,

	SL28CPLD_GPO,

};



static const struct regmap_irq sl28cpld_gpio_irqs[] = {

	REGMAP_IRQ_REG_LINE(0, 8),

	REGMAP_IRQ_REG_LINE(1, 8),

	REGMAP_IRQ_REG_LINE(2, 8),

	REGMAP_IRQ_REG_LINE(3, 8),

	REGMAP_IRQ_REG_LINE(4, 8),

	REGMAP_IRQ_REG_LINE(5, 8),

	REGMAP_IRQ_REG_LINE(6, 8),

	REGMAP_IRQ_REG_LINE(7, 8),

};



static int sl28cpld_gpio_irq_init(struct platform_device *pdev,

				  unsigned int base,

				  struct gpio_regmap_config *config)

{

	struct regmap_irq_chip_data *irq_data;

	struct regmap_irq_chip *irq_chip;

	struct device *dev = &pdev->dev;

	int irq, ret;



	if (!device_property_read_bool(dev, "interrupt-controller"))

		return 0;



	irq = platform_get_irq(pdev, 0);

	if (irq < 0)

		return irq;



	irq_chip = devm_kzalloc(dev, sizeof(*irq_chip), GFP_KERNEL);

	if (!irq_chip)

		return -ENOMEM;



	irq_chip->name = "sl28cpld-gpio-irq",

	irq_chip->irqs = sl28cpld_gpio_irqs;

	irq_chip->num_irqs = ARRAY_SIZE(sl28cpld_gpio_irqs);

	irq_chip->num_regs = 1;

	irq_chip->status_base = base + GPIO_REG_IP;

	irq_chip->mask_base = base + GPIO_REG_IE;

	irq_chip->mask_invert = true,

	irq_chip->ack_base = base + GPIO_REG_IP;



	ret = devm_regmap_add_irq_chip_fwnode(dev, dev_fwnode(dev),

					      config->regmap, irq,

					      IRQF_SHARED | IRQF_ONESHOT,

					      0, irq_chip, &irq_data);

	if (ret)

		return ret;



	config->irq_domain = regmap_irq_get_domain(irq_data);



	return 0;

}



static int sl28cpld_gpio_probe(struct platform_device *pdev)

{

	struct gpio_regmap_config config = {0};

	enum sl28cpld_gpio_type type;

	struct regmap *regmap;

	u32 base;

	int ret;



	if (!pdev->dev.parent)

		return -ENODEV;



	type = (uintptr_t)device_get_match_data(&pdev->dev);

	if (!type)

		return -ENODEV;



	ret = device_property_read_u32(&pdev->dev, "reg", &base);

	if (ret)

		return -EINVAL;



	regmap = dev_get_regmap(pdev->dev.parent, NULL);

	if (!regmap)

		return -ENODEV;



	config.regmap = regmap;

	config.parent = &pdev->dev;

	config.ngpio = 8;



	switch (type) {

	case SL28CPLD_GPIO:

		config.reg_dat_base = base + GPIO_REG_IN;

		config.reg_set_base = base + GPIO_REG_OUT;

		/* reg_dir_out_base might be zero */

		config.reg_dir_out_base = GPIO_REGMAP_ADDR(base + GPIO_REG_DIR);



		/* This type supports interrupts */

		ret = sl28cpld_gpio_irq_init(pdev, base, &config);

		if (ret)

			return ret;

		break;

	case SL28CPLD_GPO:

		config.reg_set_base = base + GPO_REG_OUT;

		break;

	case SL28CPLD_GPI:

		config.reg_dat_base = base + GPI_REG_IN;

		break;

	default:

		dev_err(&pdev->dev, "unknown type %d\n", type);

		return -ENODEV;

	}



	return PTR_ERR_OR_ZERO(devm_gpio_regmap_register(&pdev->dev, &config));

}



static const struct of_device_id sl28cpld_gpio_of_match[] = {

	{ .compatible = "kontron,sl28cpld-gpio", .data = (void *)SL28CPLD_GPIO },

	{ .compatible = "kontron,sl28cpld-gpi", .data = (void *)SL28CPLD_GPI },

	{ .compatible = "kontron,sl28cpld-gpo", .data = (void *)SL28CPLD_GPO },

	{}

};

MODULE_DEVICE_TABLE(of, sl28cpld_gpio_of_match);



static struct platform_driver sl28cpld_gpio_driver = {

	.probe = sl28cpld_gpio_probe,

	.driver = {

		.name = "sl28cpld-gpio",

		.of_match_table = sl28cpld_gpio_of_match,

	},

};

module_platform_driver(sl28cpld_gpio_driver);



MODULE_DESCRIPTION("sl28cpld GPIO Driver");

MODULE_AUTHOR("Michael Walle <michael@walle.cc>");

MODULE_LICENSE("GPL");