Commit 9409d8cf authored by Pandith N's avatar Pandith N Committed by Andy Shevchenko
Browse files

gpio: elkhartlake: Introduce Intel Elkhart Lake PSE GPIO 



This driver adds support for Intel Elkhart Lake PSE GPIO controller,
using Intel Tangier as a library driver.

Signed-off-by: default avatarPandith N <pandith.n@intel.com>
Co-developed-by: default avatarRaag Jadav <raag.jadav@intel.com>
Signed-off-by: default avatarRaag Jadav <raag.jadav@intel.com>
Co-developed-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
parent dc537030

MAINTAINERS

+1 −0
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@@ -10281,6 +10281,7 @@ M: Andy Shevchenko <andy@kernel.org> 
L:	linux-gpio@vger.kernel.org

S:	Supported

T:	git git://git.kernel.org/pub/scm/linux/kernel/git/andy/linux-gpio-intel.git

F:	drivers/gpio/gpio-elkhartlake.c

F:	drivers/gpio/gpio-ich.c

F:	drivers/gpio/gpio-merrifield.c

F:	drivers/gpio/gpio-ml-ioh.c

drivers/gpio/Kconfig

+12 −0
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@@ -625,6 +625,7 @@ config GPIO_TANGIER 
	help

	  GPIO support for Intel Tangier and compatible platforms.

	  Currently supported:

	   - Elkhart Lake

	   - Merrifield



	  If built as a module its name will be gpio-tangier.
@@ -1248,6 +1249,17 @@ config HTC_EGPIO 
	  several HTC phones.  It provides basic support for input

	  pins, output pins, and IRQs.



config GPIO_ELKHARTLAKE

	tristate "Intel Elkhart Lake PSE GPIO support"

	depends on X86 || COMPILE_TEST

	select GPIO_TANGIER

	help

	  Select this option to enable GPIO support for Intel Elkhart Lake

	  PSE GPIO IP.



	  To compile this driver as a module, choose M here: the module will

	  be called gpio-elkhartlake.



config GPIO_JANZ_TTL

	tristate "Janz VMOD-TTL Digital IO Module"

	depends on MFD_JANZ_CMODIO

drivers/gpio/Makefile

+1 −0
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@@ -54,6 +54,7 @@ obj-$(CONFIG_GPIO_DAVINCI) += gpio-davinci.o 
obj-$(CONFIG_GPIO_DLN2)			+= gpio-dln2.o

obj-$(CONFIG_GPIO_DWAPB)		+= gpio-dwapb.o

obj-$(CONFIG_GPIO_EIC_SPRD)		+= gpio-eic-sprd.o

obj-$(CONFIG_GPIO_ELKHARTLAKE)		+= gpio-elkhartlake.o

obj-$(CONFIG_GPIO_EM)			+= gpio-em.o

obj-$(CONFIG_GPIO_EN7523)		+= gpio-en7523.o

obj-$(CONFIG_GPIO_EP93XX)		+= gpio-ep93xx.o

drivers/gpio/gpio-elkhartlake.c

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// SPDX-License-Identifier: GPL-2.0-only

/*

 * Intel Elkhart Lake PSE GPIO driver

 *

 * Copyright (c) 2023 Intel Corporation.

 *

 * Authors: Pandith N <pandith.n@intel.com>

 *          Raag Jadav <raag.jadav@intel.com>

 */



#include <linux/device.h>

#include <linux/err.h>

#include <linux/module.h>

#include <linux/platform_device.h>

#include <linux/pm.h>



#include "gpio-tangier.h"



/* Each Intel EHL PSE GPIO Controller has 30 GPIO pins */

#define EHL_PSE_NGPIO		30



static int ehl_gpio_probe(struct platform_device *pdev)

{

	struct device *dev = &pdev->dev;

	struct tng_gpio *priv;

	int irq, ret;



	irq = platform_get_irq(pdev, 0);

	if (irq < 0)

		return irq;



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

	if (!priv)

		return -ENOMEM;



	priv->reg_base = devm_platform_ioremap_resource(pdev, 0);

	if (IS_ERR(priv->reg_base))

		return PTR_ERR(priv->reg_base);



	priv->dev = dev;

	priv->irq = irq;



	priv->info.base = -1;

	priv->info.ngpio = EHL_PSE_NGPIO;



	priv->wake_regs.gwmr = GWMR_EHL;

	priv->wake_regs.gwsr = GWSR_EHL;

	priv->wake_regs.gsir = GSIR_EHL;



	ret = devm_tng_gpio_probe(dev, priv);

	if (ret)

		return dev_err_probe(dev, ret, "tng_gpio_probe error\n");



	platform_set_drvdata(pdev, priv);

	return 0;

}



static int ehl_gpio_suspend(struct device *dev)

{

	return tng_gpio_suspend(dev);

}



static int ehl_gpio_resume(struct device *dev)

{

	return tng_gpio_resume(dev);

}



static DEFINE_SIMPLE_DEV_PM_OPS(ehl_gpio_pm_ops, ehl_gpio_suspend, ehl_gpio_resume);



static const struct platform_device_id ehl_gpio_ids[] = {

	{ "gpio-elkhartlake" },

	{ }

};

MODULE_DEVICE_TABLE(platform, ehl_gpio_ids);



static struct platform_driver ehl_gpio_driver = {

	.driver	= {

		.name	= "gpio-elkhartlake",

		.pm	= pm_sleep_ptr(&ehl_gpio_pm_ops),

	},

	.probe		= ehl_gpio_probe,

	.id_table	= ehl_gpio_ids,

};

module_platform_driver(ehl_gpio_driver);



MODULE_AUTHOR("Pandith N <pandith.n@intel.com>");

MODULE_AUTHOR("Raag Jadav <raag.jadav@intel.com>");

MODULE_DESCRIPTION("Intel Elkhart Lake PSE GPIO driver");

MODULE_LICENSE("GPL");

MODULE_IMPORT_NS(GPIO_TANGIER);

drivers/gpio/gpio-tangier.h

+5 −0
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@@ -20,6 +20,11 @@ struct device; 


struct tng_gpio_context;



/* Elkhart Lake specific wake registers */

#define GWMR_EHL	0x100	/* Wake mask */

#define GWSR_EHL	0x118	/* Wake source */

#define GSIR_EHL	0x130	/* Secure input */



/* Merrifield specific wake registers */

#define GWMR_MRFLD	0x400	/* Wake mask */

#define GWSR_MRFLD	0x418	/* Wake source */