Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 192 insertions, 0 deletions

diff --git a/drivers/gpio/gpio-amd-fch.c b/drivers/gpio/gpio-amd-fch.c
new file mode 100644
index 000000000..2a21354ed
--- /dev/null
+++ b/drivers/gpio/gpio-amd-fch.c
@@ -0,0 +1,192 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+/*
+ * GPIO driver for the AMD G series FCH (eg. GX-412TC)
+ *
+ * Copyright (C) 2018 metux IT consult
+ * Author: Enrico Weigelt, metux IT consult <info@metux.net>
+ *
+ */
+
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/gpio/driver.h>
+#include <linux/platform_data/gpio/gpio-amd-fch.h>
+#include <linux/spinlock.h>
+
+#define AMD_FCH_MMIO_BASE		0xFED80000
+#define AMD_FCH_GPIO_BANK0_BASE		0x1500
+#define AMD_FCH_GPIO_SIZE		0x0300
+
+#define AMD_FCH_GPIO_FLAG_DIRECTION	BIT(23)
+#define AMD_FCH_GPIO_FLAG_WRITE		BIT(22)
+#define AMD_FCH_GPIO_FLAG_READ		BIT(16)
+
+static const struct resource amd_fch_gpio_iores =
+	DEFINE_RES_MEM_NAMED(
+		AMD_FCH_MMIO_BASE + AMD_FCH_GPIO_BANK0_BASE,
+		AMD_FCH_GPIO_SIZE,
+		"amd-fch-gpio-iomem");
+
+struct amd_fch_gpio_priv {
+	struct gpio_chip		gc;
+	void __iomem			*base;
+	struct amd_fch_gpio_pdata	*pdata;
+	spinlock_t			lock;
+};
+
+static void __iomem *amd_fch_gpio_addr(struct amd_fch_gpio_priv *priv,
+				       unsigned int gpio)
+{
+	return priv->base + priv->pdata->gpio_reg[gpio]*sizeof(u32);
+}
+
+static int amd_fch_gpio_direction_input(struct gpio_chip *gc,
+					unsigned int offset)
+{
+	unsigned long flags;
+	struct amd_fch_gpio_priv *priv = gpiochip_get_data(gc);
+	void __iomem *ptr = amd_fch_gpio_addr(priv, offset);
+
+	spin_lock_irqsave(&priv->lock, flags);
+	writel_relaxed(readl_relaxed(ptr) & ~AMD_FCH_GPIO_FLAG_DIRECTION, ptr);
+	spin_unlock_irqrestore(&priv->lock, flags);
+
+	return 0;
+}
+
+static int amd_fch_gpio_direction_output(struct gpio_chip *gc,
+					 unsigned int gpio, int value)
+{
+	unsigned long flags;
+	struct amd_fch_gpio_priv *priv = gpiochip_get_data(gc);
+	void __iomem *ptr = amd_fch_gpio_addr(priv, gpio);
+	u32 val;
+
+	spin_lock_irqsave(&priv->lock, flags);
+
+	val = readl_relaxed(ptr);
+	if (value)
+		val |= AMD_FCH_GPIO_FLAG_WRITE;
+	else
+		val &= ~AMD_FCH_GPIO_FLAG_WRITE;
+
+	writel_relaxed(val | AMD_FCH_GPIO_FLAG_DIRECTION, ptr);
+
+	spin_unlock_irqrestore(&priv->lock, flags);
+
+	return 0;
+}
+
+static int amd_fch_gpio_get_direction(struct gpio_chip *gc, unsigned int gpio)
+{
+	int ret;
+	unsigned long flags;
+	struct amd_fch_gpio_priv *priv = gpiochip_get_data(gc);
+	void __iomem *ptr = amd_fch_gpio_addr(priv, gpio);
+
+	spin_lock_irqsave(&priv->lock, flags);
+	ret = (readl_relaxed(ptr) & AMD_FCH_GPIO_FLAG_DIRECTION);
+	spin_unlock_irqrestore(&priv->lock, flags);
+
+	return ret ? GPIO_LINE_DIRECTION_OUT : GPIO_LINE_DIRECTION_IN;
+}
+
+static void amd_fch_gpio_set(struct gpio_chip *gc,
+			     unsigned int gpio, int value)
+{
+	unsigned long flags;
+	struct amd_fch_gpio_priv *priv = gpiochip_get_data(gc);
+	void __iomem *ptr = amd_fch_gpio_addr(priv, gpio);
+	u32 mask;
+
+	spin_lock_irqsave(&priv->lock, flags);
+
+	mask = readl_relaxed(ptr);
+	if (value)
+		mask |= AMD_FCH_GPIO_FLAG_WRITE;
+	else
+		mask &= ~AMD_FCH_GPIO_FLAG_WRITE;
+	writel_relaxed(mask, ptr);
+
+	spin_unlock_irqrestore(&priv->lock, flags);
+}
+
+static int amd_fch_gpio_get(struct gpio_chip *gc,
+			    unsigned int offset)
+{
+	unsigned long flags;
+	int ret;
+	struct amd_fch_gpio_priv *priv = gpiochip_get_data(gc);
+	void __iomem *ptr = amd_fch_gpio_addr(priv, offset);
+
+	spin_lock_irqsave(&priv->lock, flags);
+	ret = (readl_relaxed(ptr) & AMD_FCH_GPIO_FLAG_READ);
+	spin_unlock_irqrestore(&priv->lock, flags);
+
+	return ret;
+}
+
+static int amd_fch_gpio_request(struct gpio_chip *chip,
+				unsigned int gpio_pin)
+{
+	return 0;
+}
+
+static int amd_fch_gpio_probe(struct platform_device *pdev)
+{
+	struct amd_fch_gpio_priv *priv;
+	struct amd_fch_gpio_pdata *pdata;
+
+	pdata = dev_get_platdata(&pdev->dev);
+	if (!pdata) {
+		dev_err(&pdev->dev, "no platform_data\n");
+		return -ENOENT;
+	}
+
+	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->pdata	= pdata;
+
+	priv->gc.owner			= THIS_MODULE;
+	priv->gc.parent			= &pdev->dev;
+	priv->gc.label			= dev_name(&pdev->dev);
+	priv->gc.ngpio			= priv->pdata->gpio_num;
+	priv->gc.names			= priv->pdata->gpio_names;
+	priv->gc.base			= -1;
+	priv->gc.request		= amd_fch_gpio_request;
+	priv->gc.direction_input	= amd_fch_gpio_direction_input;
+	priv->gc.direction_output	= amd_fch_gpio_direction_output;
+	priv->gc.get_direction		= amd_fch_gpio_get_direction;
+	priv->gc.get			= amd_fch_gpio_get;
+	priv->gc.set			= amd_fch_gpio_set;
+
+	spin_lock_init(&priv->lock);
+
+	priv->base = devm_ioremap_resource(&pdev->dev, &amd_fch_gpio_iores);
+	if (IS_ERR(priv->base))
+		return PTR_ERR(priv->base);
+
+	platform_set_drvdata(pdev, priv);
+
+	return devm_gpiochip_add_data(&pdev->dev, &priv->gc, priv);
+}
+
+static struct platform_driver amd_fch_gpio_driver = {
+	.driver = {
+		.name = AMD_FCH_GPIO_DRIVER_NAME,
+	},
+	.probe = amd_fch_gpio_probe,
+};
+
+module_platform_driver(amd_fch_gpio_driver);
+
+MODULE_AUTHOR("Enrico Weigelt, metux IT consult <info@metux.net>");
+MODULE_DESCRIPTION("AMD G-series FCH GPIO driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" AMD_FCH_GPIO_DRIVER_NAME);