Adding upstream version 5.10.209.upstream/5.10.209upstream

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

1 files changed, 157 insertions, 0 deletions

diff --git a/drivers/gpio/gpio-amdpt.c b/drivers/gpio/gpio-amdpt.c
new file mode 100644
index 000000000..44398992a
--- /dev/null
+++ b/drivers/gpio/gpio-amdpt.c
@@ -0,0 +1,157 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * AMD Promontory GPIO driver
+ *
+ * Copyright (C) 2015 ASMedia Technology Inc.
+ * Author: YD Tseng <yd_tseng@asmedia.com.tw>
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/gpio/driver.h>
+#include <linux/spinlock.h>
+#include <linux/acpi.h>
+#include <linux/platform_device.h>
+
+#define PT_TOTAL_GPIO 8
+
+/* PCI-E MMIO register offsets */
+#define PT_DIRECTION_REG   0x00
+#define PT_INPUTDATA_REG   0x04
+#define PT_OUTPUTDATA_REG  0x08
+#define PT_CLOCKRATE_REG   0x0C
+#define PT_SYNC_REG        0x28
+
+struct pt_gpio_chip {
+	struct gpio_chip         gc;
+	void __iomem             *reg_base;
+};
+
+static int pt_gpio_request(struct gpio_chip *gc, unsigned offset)
+{
+	struct pt_gpio_chip *pt_gpio = gpiochip_get_data(gc);
+	unsigned long flags;
+	u32 using_pins;
+
+	dev_dbg(gc->parent, "pt_gpio_request offset=%x\n", offset);
+
+	spin_lock_irqsave(&gc->bgpio_lock, flags);
+
+	using_pins = readl(pt_gpio->reg_base + PT_SYNC_REG);
+	if (using_pins & BIT(offset)) {
+		dev_warn(gc->parent, "PT GPIO pin %x reconfigured\n",
+			 offset);
+		spin_unlock_irqrestore(&gc->bgpio_lock, flags);
+		return -EINVAL;
+	}
+
+	writel(using_pins | BIT(offset), pt_gpio->reg_base + PT_SYNC_REG);
+
+	spin_unlock_irqrestore(&gc->bgpio_lock, flags);
+
+	return 0;
+}
+
+static void pt_gpio_free(struct gpio_chip *gc, unsigned offset)
+{
+	struct pt_gpio_chip *pt_gpio = gpiochip_get_data(gc);
+	unsigned long flags;
+	u32 using_pins;
+
+	spin_lock_irqsave(&gc->bgpio_lock, flags);
+
+	using_pins = readl(pt_gpio->reg_base + PT_SYNC_REG);
+	using_pins &= ~BIT(offset);
+	writel(using_pins, pt_gpio->reg_base + PT_SYNC_REG);
+
+	spin_unlock_irqrestore(&gc->bgpio_lock, flags);
+
+	dev_dbg(gc->parent, "pt_gpio_free offset=%x\n", offset);
+}
+
+static int pt_gpio_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct acpi_device *acpi_dev;
+	acpi_handle handle = ACPI_HANDLE(dev);
+	struct pt_gpio_chip *pt_gpio;
+	int ret = 0;
+
+	if (acpi_bus_get_device(handle, &acpi_dev)) {
+		dev_err(dev, "PT GPIO device node not found\n");
+		return -ENODEV;
+	}
+
+	pt_gpio = devm_kzalloc(dev, sizeof(struct pt_gpio_chip), GFP_KERNEL);
+	if (!pt_gpio)
+		return -ENOMEM;
+
+	pt_gpio->reg_base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(pt_gpio->reg_base)) {
+		dev_err(dev, "Failed to map MMIO resource for PT GPIO.\n");
+		return PTR_ERR(pt_gpio->reg_base);
+	}
+
+	ret = bgpio_init(&pt_gpio->gc, dev, 4,
+			 pt_gpio->reg_base + PT_INPUTDATA_REG,
+			 pt_gpio->reg_base + PT_OUTPUTDATA_REG, NULL,
+			 pt_gpio->reg_base + PT_DIRECTION_REG, NULL,
+			 BGPIOF_READ_OUTPUT_REG_SET);
+	if (ret) {
+		dev_err(dev, "bgpio_init failed\n");
+		return ret;
+	}
+
+	pt_gpio->gc.owner            = THIS_MODULE;
+	pt_gpio->gc.request          = pt_gpio_request;
+	pt_gpio->gc.free             = pt_gpio_free;
+	pt_gpio->gc.ngpio            = PT_TOTAL_GPIO;
+#if defined(CONFIG_OF_GPIO)
+	pt_gpio->gc.of_node          = dev->of_node;
+#endif
+	ret = gpiochip_add_data(&pt_gpio->gc, pt_gpio);
+	if (ret) {
+		dev_err(dev, "Failed to register GPIO lib\n");
+		return ret;
+	}
+
+	platform_set_drvdata(pdev, pt_gpio);
+
+	/* initialize register setting */
+	writel(0, pt_gpio->reg_base + PT_SYNC_REG);
+	writel(0, pt_gpio->reg_base + PT_CLOCKRATE_REG);
+
+	dev_dbg(dev, "PT GPIO driver loaded\n");
+	return ret;
+}
+
+static int pt_gpio_remove(struct platform_device *pdev)
+{
+	struct pt_gpio_chip *pt_gpio = platform_get_drvdata(pdev);
+
+	gpiochip_remove(&pt_gpio->gc);
+
+	return 0;
+}
+
+static const struct acpi_device_id pt_gpio_acpi_match[] = {
+	{ "AMDF030", 0 },
+	{ "AMDIF030", 0 },
+	{ },
+};
+MODULE_DEVICE_TABLE(acpi, pt_gpio_acpi_match);
+
+static struct platform_driver pt_gpio_driver = {
+	.driver = {
+		.name = "pt-gpio",
+		.acpi_match_table = ACPI_PTR(pt_gpio_acpi_match),
+	},
+	.probe = pt_gpio_probe,
+	.remove = pt_gpio_remove,
+};
+
+module_platform_driver(pt_gpio_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("YD Tseng <yd_tseng@asmedia.com.tw>");
+MODULE_DESCRIPTION("AMD Promontory GPIO Driver");