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Message-Id: <20230216132356.29922-4-raag.jadav@intel.com>
Date: Thu, 16 Feb 2023 18:53:56 +0530
From: Raag Jadav <raag.jadav@...el.com>
To: linus.walleij@...aro.org, brgl@...ev.pl,
andriy.shevchenko@...ux.intel.com
Cc: linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
mallikarjunappa.sangannavar@...el.com, pandith.n@...el.com,
Raag Jadav <raag.jadav@...el.com>
Subject: [PATCH v1 3/3] gpio: elkhartlake: Introduce Elkhart Lake PSE GPIO
From: Pandith N <pandith.n@...el.com>
This driver adds support for Elkhart Lake PSE GPIO controller,
using Intel Tangier as a library driver.
Signed-off-by: Pandith N <pandith.n@...el.com>
Co-developed-by: Raag Jadav <raag.jadav@...el.com>
Signed-off-by: Raag Jadav <raag.jadav@...el.com>
---
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@...nel.org>
L: linux-gpio@...r.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
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@...el.com>
+ * Raag Jadav <raag.jadav@...el.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->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@...el.com>");
+MODULE_AUTHOR("Raag Jadav <raag.jadav@...el.com>");
+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
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