[PATCH v1 3/3] gpio: elkhartlake: Introduce Elkhart Lake PSE GPIO

[Raag Jadav <raag.jadav@xxxxxxxxx>]

From: Pandith N <pandith.n@xxxxxxxxx>

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

Signed-off-by: Pandith N <pandith.n@xxxxxxxxx>
Co-developed-by: Raag Jadav <raag.jadav@xxxxxxxxx>
Signed-off-by: Raag Jadav <raag.jadav@xxxxxxxxx>
---
 MAINTAINERS                     |  1 +
 drivers/gpio/Kconfig            | 12 +++++
 drivers/gpio/Makefile           |  1 +
 drivers/gpio/gpio-elkhartlake.c | 94 +++++++++++++++++++++++++++++++++
 drivers/gpio/gpio-tangier.h     |  5 ++
 5 files changed, 113 insertions(+)
 create mode 100644 drivers/gpio/gpio-elkhartlake.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 3e9d42b2747d..aec1a2040f32 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -10389,6 +10389,7 @@ M:	Andy Shevchenko <andy@xxxxxxxxxx>
 L:	linux-gpio@xxxxxxxxxxxxxxx
 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
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 7fc7a2768705..c60066d4cd72 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -242,6 +242,17 @@ config GPIO_DWAPB
 	  Say Y or M here to build support for the Synopsys DesignWare APB
 	  GPIO block.
 
+config GPIO_ELKHARTLAKE
+	tristate "Intel Elkhart Lake PSE GPIO support"
+	depends on (X86 && ACPI) || 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_EIC_SPRD
 	tristate "Spreadtrum EIC support"
 	depends on ARCH_SPRD || COMPILE_TEST
@@ -632,6 +643,7 @@ 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.
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index a6cea9d2c973..8c34d5e39eb8 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -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
diff --git a/drivers/gpio/gpio-elkhartlake.c b/drivers/gpio/gpio-elkhartlake.c
new file mode 100644
index 000000000000..cf728ff35857
--- /dev/null
+++ b/drivers/gpio/gpio-elkhartlake.c
@@ -0,0 +1,94 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Intel Elkhart Lake PSE GPIO driver
+ *
+ * Copyright (c) 2023 Intel Corporation.
+ *
+ * Authors: Pandith N <pandith.n@xxxxxxxxx>
+ *          Raag Jadav <raag.jadav@xxxxxxxxx>
+ */
+
+#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->ctx = devm_kzalloc(dev, sizeof(*priv->ctx), GFP_KERNEL);
+	if (!priv->ctx)
+		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->chip.base = -1;
+	priv->chip.ngpio = EHL_PSE_NGPIO;
+	priv->chip.can_sleep = false;
+	priv->irq = irq;
+
+	priv->reg.gwmr = GWMR_EHL;
+	priv->reg.gwsr = GWSR_EHL;
+	priv->reg.gsir = GSIR_EHL;
+
+	ret = tng_gpio_probe(priv);
+	if (ret)
+		return dev_err_probe(dev, ret, "tng_gpio_probe error %d\n", ret);
+
+	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@xxxxxxxxx>");
+MODULE_AUTHOR("Raag Jadav <raag.jadav@xxxxxxxxx>");
+MODULE_DESCRIPTION("Intel Elkhart Lake PSE GPIO driver");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS(GPIO_TANGIER);
diff --git a/drivers/gpio/gpio-tangier.h b/drivers/gpio/gpio-tangier.h
index 414530c60c5a..6390a14ed9de 100644
--- a/drivers/gpio/gpio-tangier.h
+++ b/drivers/gpio/gpio-tangier.h
@@ -18,6 +18,11 @@
 
 struct device;
 
+/* 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 */
-- 
2.17.1