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: Pandith N <pandith.n@intel.com>
Co-developed-by: Raag Jadav <raag.jadav@intel.com>
Signed-off-by: Raag Jadav <raag.jadav@intel.com>
Co-developed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

diff --git a/MAINTAINERS b/MAINTAINERS
index 1176ae6..958e557 100644 (file)
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -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

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index c769d29..8f442ed 100644 (file)
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -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

diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index d884abb..594a443 100644 (file)
--- 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 (file)
index 0000000..a9c8b16
--- /dev/null
+++ b/drivers/gpio/gpio-elkhartlake.c
@@ -0,0 +1,90 @@
+// 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);

diff --git a/drivers/gpio/gpio-tangier.h b/drivers/gpio/gpio-tangier.h
index 735b966..16c4f22 100644 (file)
--- a/drivers/gpio/gpio-tangier.h
+++ b/drivers/gpio/gpio-tangier.h
@@ -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 */