From bd37c999c7ca76afd4f28987314e98e022875dbc Mon Sep 17 00:00:00 2001 From: Kelvin Cheung Date: Wed, 6 Apr 2016 20:34:53 +0800 Subject: [PATCH] gpio: Loongson1: add Loongson1 GPIO driver This patch adds GPIO driver for Loongson1B. Signed-off-by: Kelvin Cheung Signed-off-by: Linus Walleij --- drivers/gpio/Kconfig | 7 +++ drivers/gpio/Makefile | 1 + drivers/gpio/gpio-loongson1.c | 102 ++++++++++++++++++++++++++++++++++ 3 files changed, 110 insertions(+) create mode 100644 drivers/gpio/gpio-loongson1.c diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index 08a93e0b35c5..37f03786b0e6 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -511,6 +511,13 @@ config GPIO_ZX help 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 menu "Port-mapped I/O GPIO drivers" diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index 1e0b74f3b1ed..40ab9134a40c 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -127,3 +127,4 @@ obj-$(CONFIG_GPIO_XTENSA) += gpio-xtensa.o obj-$(CONFIG_GPIO_ZEVIO) += gpio-zevio.o obj-$(CONFIG_GPIO_ZYNQ) += gpio-zynq.o obj-$(CONFIG_GPIO_ZX) += gpio-zx.o +obj-$(CONFIG_GPIO_LOONGSON1) += gpio-loongson1.o diff --git a/drivers/gpio/gpio-loongson1.c b/drivers/gpio/gpio-loongson1.c new file mode 100644 index 000000000000..10c09bdd8514 --- /dev/null +++ b/drivers/gpio/gpio-loongson1.c @@ -0,0 +1,102 @@ +/* + * GPIO Driver for Loongson 1 SoC + * + * Copyright (C) 2015-2016 Zhang, Keguang + * + * 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 +#include + +/* 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 "); +MODULE_DESCRIPTION("Loongson1 GPIO driver"); +MODULE_LICENSE("GPL"); -- 2.25.1