gpio: Loongson1: add Loongson1 GPIO driver (bd37c999) · Commits · e / devices / android_kernel_oneplus_sm7250

drivers/gpio/Kconfig

+7 −0

Original line number	Original line	Diff line number	Diff line
	@@ -511,6 +511,13 @@ config GPIO_ZX
	help		help
	Say yes here to support the GPIO device on ZTE ZX SoCs.		Say yes here to support the GPIO device on ZTE ZX SoCs.

			config GPIO_LOONGSON1
			tristate "Loongson1 GPIO support"
			depends on MACH_LOONGSON32
			select GPIO_GENERIC
			help
			Say Y or M here to support GPIO on Loongson1 SoCs.

	endmenu		endmenu

	menu "Port-mapped I/O GPIO drivers"		menu "Port-mapped I/O GPIO drivers"

drivers/gpio/Makefile

+1 −0

Original line number	Original line	Diff line number	Diff line
	@@ -127,3 +127,4 @@ obj-$(CONFIG_GPIO_XTENSA) += gpio-xtensa.o
	obj-$(CONFIG_GPIO_ZEVIO) += gpio-zevio.o		obj-$(CONFIG_GPIO_ZEVIO) += gpio-zevio.o
	obj-$(CONFIG_GPIO_ZYNQ) += gpio-zynq.o		obj-$(CONFIG_GPIO_ZYNQ) += gpio-zynq.o
	obj-$(CONFIG_GPIO_ZX) += gpio-zx.o		obj-$(CONFIG_GPIO_ZX) += gpio-zx.o
			obj-$(CONFIG_GPIO_LOONGSON1) += gpio-loongson1.o

drivers/gpio/gpio-loongson1.c

0 → 100644

+102 −0

Original line number	Original line	Diff line number	Diff line
			/*
			* GPIO Driver for Loongson 1 SoC
			*
			* Copyright (C) 2015-2016 Zhang, Keguang <keguang.zhang@gmail.com>
			*
			* This file is licensed under the terms of the GNU General Public
			* License version 2. This program is licensed "as is" without any
			* warranty of any kind, whether express or implied.
			*/

			#include <linux/gpio/driver.h>
			#include <linux/platform_device.h>

			/* Loongson 1 GPIO Register Definitions */
			#define GPIO_CFG 0x0
			#define GPIO_DIR 0x10
			#define GPIO_DATA 0x20
			#define GPIO_OUTPUT 0x30

			static void __iomem *gpio_reg_base;

			static int ls1x_gpio_request(struct gpio_chip *gc, unsigned int offset)
			{
			unsigned long pinmask = gc->pin2mask(gc, offset);
			unsigned long flags;

			spin_lock_irqsave(&gc->bgpio_lock, flags);
			__raw_writel(__raw_readl(gpio_reg_base + GPIO_CFG) \| pinmask,
			gpio_reg_base + GPIO_CFG);
			spin_unlock_irqrestore(&gc->bgpio_lock, flags);

			return 0;
			}

			static void ls1x_gpio_free(struct gpio_chip *gc, unsigned int offset)
			{
			unsigned long pinmask = gc->pin2mask(gc, offset);
			unsigned long flags;

			spin_lock_irqsave(&gc->bgpio_lock, flags);
			__raw_writel(__raw_readl(gpio_reg_base + GPIO_CFG) & ~pinmask,
			gpio_reg_base + GPIO_CFG);
			spin_unlock_irqrestore(&gc->bgpio_lock, flags);
			}

			static int ls1x_gpio_probe(struct platform_device *pdev)
			{
			struct device *dev = &pdev->dev;
			struct gpio_chip *gc;
			struct resource *res;
			int ret;

			gc = devm_kzalloc(dev, sizeof(*gc), GFP_KERNEL);
			if (!gc)
			return -ENOMEM;

			res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
			if (!res) {
			dev_err(dev, "failed to get I/O memory\n");
			return -EINVAL;
			}

			gpio_reg_base = devm_ioremap_resource(dev, res);
			if (IS_ERR(gpio_reg_base))
			return PTR_ERR(gpio_reg_base);

			ret = bgpio_init(gc, dev, 4, gpio_reg_base + GPIO_DATA,
			gpio_reg_base + GPIO_OUTPUT, NULL,
			NULL, gpio_reg_base + GPIO_DIR, 0);
			if (ret)
			goto err;

			gc->owner = THIS_MODULE;
			gc->request = ls1x_gpio_request;
			gc->free = ls1x_gpio_free;
			gc->base = pdev->id * 32;

			ret = devm_gpiochip_add_data(dev, gc, NULL);
			if (ret)
			goto err;

			platform_set_drvdata(pdev, gc);
			dev_info(dev, "Loongson1 GPIO driver registered\n");

			return 0;
			err:
			dev_err(dev, "failed to register GPIO device\n");
			return ret;
			}

			static struct platform_driver ls1x_gpio_driver = {
			.probe = ls1x_gpio_probe,
			.driver = {
			.name = "ls1x-gpio",
			},
			};

			module_platform_driver(ls1x_gpio_driver);

			MODULE_AUTHOR("Kelvin Cheung <keguang.zhang@gmail.com>");
			MODULE_DESCRIPTION("Loongson1 GPIO driver");
			MODULE_LICENSE("GPL");