gpio: loongson: Add 3A/3B/3C/7A gpio dirver support

LoongArch inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I6BWFP

--------------------------------

Change-Id: Ib1adc61f5279bba8020f26acc32a4de4dee95df5
Signed-off-by: NJuxin Gao <gaojuxin@loongson.cn>

drivers/gpio/Kconfig

@@ -370,7 +370,8 @@ config GPIO_LOGICVC
 
 config GPIO_LOONGSON
 	bool "Loongson-2/3 GPIO support"
-	depends on CPU_LOONGSON2EF || CPU_LOONGSON64
+	depends on CPU_LOONGSON2EF || CPU_LOONGSON64 || LOONGARCH
+	default m
 	help
 	  driver for GPIO functionality on Loongson-2F/3A/3B processors.
 

drivers/gpio/gpio-loongson.c

-// SPDX-License-Identifier: GPL-2.0-or-later
 /*
- *  Loongson-2F/3A/3B GPIO Support
+ *  Loongson-3A/3B/3C/7A GPIO Support
  *
- *  Copyright (c) 2008 Richard Liu,  STMicroelectronics	 <richard.liu@st.com>
- *  Copyright (c) 2008-2010 Arnaud Patard <apatard@mandriva.com>
- *  Copyright (c) 2013 Hongbing Hu <huhb@lemote.com>
- *  Copyright (c) 2014 Huacai Chen <chenhc@lemote.com>
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
  */
 
+#include <linux/acpi.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/module.h>
@@ -17,119 +17,382 @@
 #include <linux/platform_device.h>
 #include <linux/bitops.h>
 #include <asm/types.h>
-#include <loongson.h>
 
-#define STLS2F_N_GPIO		4
-#define STLS3A_N_GPIO		16
+/* ============== Data structrues =============== */
 
-#ifdef CONFIG_CPU_LOONGSON64
-#define LOONGSON_N_GPIO	STLS3A_N_GPIO
-#else
-#define LOONGSON_N_GPIO	STLS2F_N_GPIO
-#endif
+/* gpio data */
+struct platform_gpio_data {
+	u32 gpio_conf;
+	u32 gpio_out;
+	u32 gpio_in;
+	u32 in_start_bit;
+	u32 support_irq;
+	char *label;
+	int gpio_base;
+	int ngpio;
+};
+
+#define GPIO_IO_CONF(x)	                (x->base + x->conf_offset)
+#define GPIO_OUT(x)	                (x->base + x->out_offset)
+#define GPIO_IN(x)	                (x->base + x->in_offset)
+
+#define LS7A_GPIO_OEN_BYTE(x, gpio)	(x->base + x->conf_offset + gpio)
+#define LS7A_GPIO_OUT_BYTE(x, gpio)	(x->base + x->out_offset + gpio)
+#define LS7A_GPIO_IN_BYTE(x, gpio)	(x->base + x->in_offset + gpio)
+
+struct loongson_gpio_chip {
+	struct gpio_chip	chip;
+	spinlock_t		lock;
+	void __iomem		*base;
+	int conf_offset;
+	int out_offset;
+	int in_offset;
+	int in_start_bit;
+	u16 *gsi_idx_map;
+	u16 mapsize;
+	bool support_irq;
+};
 
 /*
- * Offset into the register where we read lines, we write them from offset 0.
- * This offset is the only thing that stand between us and using
- * GPIO_GENERIC.
+ * GPIO primitives.
  */
-#define LOONGSON_GPIO_IN_OFFSET	16
+static int loongson_gpio_request(struct gpio_chip *chip, unsigned pin)
+{
+	if (pin >= chip->ngpio)
+		return -EINVAL;
+	else
+		return 0;
+}
+
+static inline void
+__set_direction(struct loongson_gpio_chip *lgpio, unsigned pin, int input)
+{
+	u64 temp;
+	u8  value;
 
-static DEFINE_SPINLOCK(gpio_lock);
+	if (!strcmp(lgpio->chip.label, "loongson,loongson3-gpio") ||
+			!strncmp(lgpio->chip.label, "LOON0007", 8)) {
+		temp = readq(GPIO_IO_CONF(lgpio));
+		if (input)
+			temp |= 1ULL << pin;
+		else
+			temp &= ~(1ULL << pin);
+		writeq(temp, GPIO_IO_CONF(lgpio));
+		return ;
+	}
+	if (!strcmp(lgpio->chip.label,"loongson,ls7a-gpio") ||
+			!strncmp(lgpio->chip.label, "LOON0002", 8)){
+		if (input)
+			value = 1;
+		else
+			value = 0;
+		writeb(value, LS7A_GPIO_OEN_BYTE(lgpio, pin));
+		return ;
+	}
+}
 
-static int loongson_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
+static void __set_level(struct loongson_gpio_chip *lgpio, unsigned pin, int high)
 {
-	u32 val;
+	u64 temp;
+	u8 value;
 
-	spin_lock(&gpio_lock);
-	val = LOONGSON_GPIODATA;
-	spin_unlock(&gpio_lock);
+	/* If GPIO controller is on 3A,then... */
+	if (!strcmp(lgpio->chip.label, "loongson,loongson3-gpio") ||
+			!strncmp(lgpio->chip.label, "LOON0007", 8)) {
+		temp = readq(GPIO_OUT(lgpio));
+		if (high)
+			temp |= 1ULL << pin;
+		else
+			temp &= ~(1ULL << pin);
+		writeq(temp, GPIO_OUT(lgpio));
+		return;
+	}
 
-	return !!(val & BIT(gpio + LOONGSON_GPIO_IN_OFFSET));
+	if (!strcmp(lgpio->chip.label,"loongson,ls7a-gpio") ||
+			!strncmp(lgpio->chip.label,"LOON0002", 8)){
+	        if (high)
+		        value = 1;
+	        else
+		        value = 0;
+		writeb(value, LS7A_GPIO_OUT_BYTE(lgpio, pin));
+		return;
+	}
 }
 
-static void loongson_gpio_set_value(struct gpio_chip *chip,
-		unsigned gpio, int value)
+static int loongson_gpio_direction_input(struct gpio_chip *chip, unsigned pin)
 {
-	u32 val;
+	unsigned long flags;
+	struct loongson_gpio_chip *lgpio =
+		container_of(chip, struct loongson_gpio_chip, chip);
 
-	spin_lock(&gpio_lock);
-	val = LOONGSON_GPIODATA;
-	if (value)
-		val |= BIT(gpio);
-	else
-		val &= ~BIT(gpio);
-	LOONGSON_GPIODATA = val;
-	spin_unlock(&gpio_lock);
+	spin_lock_irqsave(&lgpio->lock, flags);
+	__set_direction(lgpio, pin, 1);
+	spin_unlock_irqrestore(&lgpio->lock, flags);
+
+	return 0;
 }
 
-static int loongson_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
+static int loongson_gpio_direction_output(struct gpio_chip *chip,
+		unsigned pin, int value)
 {
-	u32 temp;
+	struct loongson_gpio_chip *lgpio =
+		container_of(chip, struct loongson_gpio_chip, chip);
+	unsigned long flags;
 
-	spin_lock(&gpio_lock);
-	temp = LOONGSON_GPIOIE;
-	temp |= BIT(gpio);
-	LOONGSON_GPIOIE = temp;
-	spin_unlock(&gpio_lock);
+	spin_lock_irqsave(&lgpio->lock, flags);
+	__set_level(lgpio, pin, value);
+	__set_direction(lgpio, pin, 0);
+	spin_unlock_irqrestore(&lgpio->lock, flags);
 
 	return 0;
 }
 
-static int loongson_gpio_direction_output(struct gpio_chip *chip,
-		unsigned gpio, int level)
+static int loongson_gpio_get(struct gpio_chip *chip, unsigned pin)
 {
-	u32 temp;
+	struct loongson_gpio_chip *lgpio =
+		container_of(chip, struct loongson_gpio_chip, chip);
+	u64 temp;
+        u8  value;
 
-	loongson_gpio_set_value(chip, gpio, level);
-	spin_lock(&gpio_lock);
-	temp = LOONGSON_GPIOIE;
-	temp &= ~BIT(gpio);
-	LOONGSON_GPIOIE = temp;
-	spin_unlock(&gpio_lock);
+	/* GPIO controller in 3A is different for 7A */
+	if (!strcmp(lgpio->chip.label, "loongson,loongson3-gpio") ||
+			!strncmp(lgpio->chip.label, "LOON0007", 8)) {
+		temp = readq(GPIO_IN(lgpio));
+		return ((temp & (1ULL << (pin + lgpio->in_start_bit))) != 0);
+	}
+
+	if (!strcmp(lgpio->chip.label,"loongson,ls7a-gpio") ||
+			!strncmp(lgpio->chip.label, "LOON0002", 8)){
+		value = readb(LS7A_GPIO_IN_BYTE(lgpio, pin));
+                return (value & 1);
+        }
+
+	return -ENXIO;
+}
+
+static void loongson_gpio_set(struct gpio_chip *chip, unsigned pin, int value)
+{
+	struct loongson_gpio_chip *lgpio =
+		container_of(chip, struct loongson_gpio_chip, chip);
+	unsigned long flags;
+
+	spin_lock_irqsave(&lgpio->lock, flags);
+	__set_level(lgpio, pin, value);
+	spin_unlock_irqrestore(&lgpio->lock, flags);
+}
+
+static int loongson_gpio_to_irq(struct gpio_chip *chip, unsigned int offset)
+{
+	struct platform_device *pdev =
+		container_of(chip->parent, struct platform_device, dev);
+	struct loongson_gpio_chip *lgpio =
+		container_of(chip, struct loongson_gpio_chip, chip);
+
+	if (offset >= chip->ngpio)
+		return -EINVAL;
+
+	if ((lgpio->gsi_idx_map != NULL) && (offset < lgpio->mapsize))
+		offset = lgpio->gsi_idx_map[offset];
+
+	return platform_get_irq(pdev, offset);
+}
+
+static int loongson_gpio_init(struct device *dev, struct loongson_gpio_chip *lgpio, struct device_node *np,
+			    void __iomem *base)
+{
+	lgpio->chip.request = loongson_gpio_request;
+	lgpio->chip.direction_input = loongson_gpio_direction_input;
+	lgpio->chip.get = loongson_gpio_get;
+	lgpio->chip.direction_output = loongson_gpio_direction_output;
+	lgpio->chip.set = loongson_gpio_set;
+	lgpio->chip.can_sleep = 0;
+	lgpio->chip.of_node = np;
+	lgpio->chip.parent = dev;
+	spin_lock_init(&lgpio->lock);
+	lgpio->base = (void __iomem *)base;
+
+	if (!strcmp(lgpio->chip.label, "loongson,ls7a-gpio") ||
+		!strncmp(lgpio->chip.label, "LOON0002", 8) ||
+		!strcmp(lgpio->chip.label, "loongson,loongson3-gpio") ||
+		!strncmp(lgpio->chip.label, "LOON0007", 8)) {
+
+		lgpio->chip.to_irq = loongson_gpio_to_irq;
+	}
+	gpiochip_add(&lgpio->chip);
 
 	return 0;
 }
 
+
+static void of_loongson_gpio_get_props(struct device_node *np,
+				  struct loongson_gpio_chip *lgpio)
+{
+	const char *name;
+
+	of_property_read_u32(np, "ngpios", (u32 *)&lgpio->chip.ngpio);
+	of_property_read_u32(np, "gpio_base", (u32 *)&lgpio->chip.base);
+	of_property_read_u32(np, "conf_offset", (u32 *)&lgpio->conf_offset);
+	of_property_read_u32(np, "out_offset", (u32 *)&lgpio->out_offset);
+	of_property_read_u32(np, "in_offset", (u32 *)&lgpio->in_offset);
+	of_property_read_string(np, "compatible", &name);
+	if (!strcmp(name, "loongson,loongson3-gpio")) {
+		of_property_read_u32(np, "in_start_bit",
+					(u32 *)&lgpio->in_start_bit);
+		if (of_property_read_bool(np, "support_irq"))
+			lgpio->support_irq = true;
+	}
+	lgpio->chip.label = kstrdup(name, GFP_KERNEL);
+}
+
+static void acpi_loongson_gpio_get_props(struct platform_device *pdev,
+				  struct loongson_gpio_chip *lgpio)
+{
+
+	struct device *dev = &pdev->dev;
+	int rval;
+
+	device_property_read_u32(dev, "ngpios", (u32 *)&lgpio->chip.ngpio);
+	device_property_read_u32(dev, "gpio_base", (u32 *)&lgpio->chip.base);
+	device_property_read_u32(dev, "conf_offset", (u32 *)&lgpio->conf_offset);
+	device_property_read_u32(dev, "out_offset", (u32 *)&lgpio->out_offset);
+	device_property_read_u32(dev, "in_offset", (u32 *)&lgpio->in_offset);
+	rval = device_property_read_u16_array(dev, "gsi_idx_map", NULL, 0);
+	if (rval > 0) {
+		lgpio->gsi_idx_map =
+			kmalloc_array(rval, sizeof(*lgpio->gsi_idx_map),
+					GFP_KERNEL);
+		if (unlikely(!lgpio->gsi_idx_map)) {
+			dev_err(dev, "Alloc gsi_idx_map fail!\n");
+		} else {
+			lgpio->mapsize = rval;
+			device_property_read_u16_array(dev, "gsi_idx_map",
+					lgpio->gsi_idx_map, lgpio->mapsize);
+		}
+	}
+	if (!strcmp(pdev->name, "LOON0007")) {
+		device_property_read_u32(dev, "in_start_bit",
+						(u32 *)&lgpio->in_start_bit);
+		if (device_property_read_bool(dev, "support_irq"))
+			lgpio->support_irq = true;
+	}
+	lgpio->chip.label = kstrdup(pdev->name, GFP_KERNEL);
+}
+
+static void platform_loongson_gpio_get_props(struct platform_device *pdev,
+				  struct loongson_gpio_chip *lgpio)
+{
+	struct platform_gpio_data *gpio_data =
+		(struct platform_gpio_data *)pdev->dev.platform_data;
+
+	lgpio->chip.ngpio = gpio_data->ngpio;
+	lgpio->chip.base = gpio_data->gpio_base;
+	lgpio->conf_offset = gpio_data->gpio_conf;
+	lgpio->out_offset = gpio_data->gpio_out;
+	lgpio->in_offset = gpio_data->gpio_in;
+	if (!strcmp(gpio_data->label, "loongson,loongson3-gpio")) {
+		lgpio->in_start_bit = gpio_data->in_start_bit;
+		lgpio->support_irq = gpio_data->support_irq;
+	}
+	lgpio->chip.label = kstrdup(gpio_data->label, GFP_KERNEL);
+}
+
 static int loongson_gpio_probe(struct platform_device *pdev)
 {
-	struct gpio_chip *gc;
+	struct resource *iores;
+	void __iomem *base;
+	struct loongson_gpio_chip *lgpio;
+	struct device_node *np = pdev->dev.of_node;
 	struct device *dev = &pdev->dev;
+	int ret = 0;
 
-	gc = devm_kzalloc(dev, sizeof(*gc), GFP_KERNEL);
-	if (!gc)
+	lgpio = kzalloc(sizeof(struct loongson_gpio_chip), GFP_KERNEL);
+	if (!lgpio)
 		return -ENOMEM;
 
-	gc->label = "loongson-gpio-chip";
-	gc->base = 0;
-	gc->ngpio = LOONGSON_N_GPIO;
-	gc->get = loongson_gpio_get_value;
-	gc->set = loongson_gpio_set_value;
-	gc->direction_input = loongson_gpio_direction_input;
-	gc->direction_output = loongson_gpio_direction_output;
+	if (np){
+		of_loongson_gpio_get_props(np,lgpio);
+	} else if (ACPI_COMPANION(&pdev->dev)) {
+		acpi_loongson_gpio_get_props(pdev,lgpio);
+	} else {
+		platform_loongson_gpio_get_props(pdev,lgpio);
+	}
+
+	iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!iores) {
+		ret = -ENODEV;
+		goto out;
+	}
+	if (!request_mem_region(iores->start, resource_size(iores),
+				pdev->name)) {
+		ret = -EBUSY;
+		goto out;
+	}
+	base = ioremap(iores->start, resource_size(iores));
+	if (!base) {
+		ret = -ENOMEM;
+		goto out;
+	}
+	platform_set_drvdata(pdev, lgpio);
+	loongson_gpio_init(dev,lgpio, np, base);
 
-	return gpiochip_add_data(gc, NULL);
+	return 0;
+out:
+	pr_err("%s: %s: missing mandatory property\n", __func__, np->name);
+	return ret;
 }
 
-static struct platform_driver loongson_gpio_driver = {
+static int loongson_gpio_remove(struct platform_device *pdev)
+{
+	struct loongson_gpio_chip *lgpio = platform_get_drvdata(pdev);
+	struct resource		*mem;
+
+	platform_set_drvdata(pdev, NULL);
+	gpiochip_remove(&lgpio->chip);
+	iounmap(lgpio->base);
+	kfree(lgpio->gsi_idx_map);
+	kfree(lgpio);
+	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	release_mem_region(mem->start, resource_size(mem));
+	return 0;
+}
+
+static const struct of_device_id loongson_gpio_dt_ids[] = {
+	{ .compatible = "loongson,loongson3-gpio"},
+	{ .compatible = "loongson,ls7a-gpio"},
+	{}
+};
+MODULE_DEVICE_TABLE(of, loongson_gpio_dt_ids);
+
+static const struct acpi_device_id loongson_gpio_acpi_match[] = {
+	{"LOON0002"},
+	{"LOON0007"},
+	{}
+};
+MODULE_DEVICE_TABLE(acpi, loongson_gpio_acpi_match);
+
+static struct platform_driver ls_gpio_driver = {
 	.driver = {
 		.name = "loongson-gpio",
+		.owner	= THIS_MODULE,
+		.of_match_table = loongson_gpio_dt_ids,
+		.acpi_match_table = ACPI_PTR(loongson_gpio_acpi_match),
 	},
 	.probe = loongson_gpio_probe,
+	.remove = loongson_gpio_remove,
 };
 
 static int __init loongson_gpio_setup(void)
 {
-	struct platform_device *pdev;
-	int ret;
-
-	ret = platform_driver_register(&loongson_gpio_driver);
-	if (ret) {
-		pr_err("error registering loongson GPIO driver\n");
-		return ret;
-	}
+	return platform_driver_register(&ls_gpio_driver);
+}
+subsys_initcall(loongson_gpio_setup);
 
-	pdev = platform_device_register_simple("loongson-gpio", -1, NULL, 0);
-	return PTR_ERR_OR_ZERO(pdev);
+static void __exit loongson_gpio_driver(void)
+{
+	platform_driver_unregister(&ls_gpio_driver);
 }
-postcore_initcall(loongson_gpio_setup);
+module_exit(loongson_gpio_driver);
+MODULE_AUTHOR("Loongson Technology Corporation Limited");
+MODULE_DESCRIPTION("LOONGSON GPIO");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:loongson_gpio");