Add GPIO driver for MOXA ART SoCs. Signed-off-by: Jonas Jensen <jonas.jensen@xxxxxxxxx> --- Notes: Thanks Arnd, done in other drivers no reason to not do it here. Changes since v6: 1. remove global __iomem pointer 2. add derived data structure "struct moxart_gpio_chip" 3. use container_of() 4. add container_of() helper function Applies to next-20131129 .../devicetree/bindings/gpio/moxa,moxart-gpio.txt | 19 +++ drivers/gpio/Kconfig | 7 + drivers/gpio/Makefile | 1 + drivers/gpio/gpio-moxart.c | 162 +++++++++++++++++++++ 4 files changed, 189 insertions(+) create mode 100644 Documentation/devicetree/bindings/gpio/moxa,moxart-gpio.txt create mode 100644 drivers/gpio/gpio-moxart.c diff --git a/Documentation/devicetree/bindings/gpio/moxa,moxart-gpio.txt b/Documentation/devicetree/bindings/gpio/moxa,moxart-gpio.txt new file mode 100644 index 0000000..f8e8f18 --- /dev/null +++ b/Documentation/devicetree/bindings/gpio/moxa,moxart-gpio.txt @@ -0,0 +1,19 @@ +MOXA ART GPIO Controller + +Required properties: + +- #gpio-cells : Should be 2, The first cell is the pin number, + the second cell is used to specify polarity: + 0 = active high + 1 = active low +- compatible : Must be "moxa,moxart-gpio" +- reg : Should contain registers location and length + +Example: + + gpio: gpio@98700000 { + gpio-controller; + #gpio-cells = <2>; + compatible = "moxa,moxart-gpio"; + reg = <0x98700000 0xC>; + }; diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index 0f04444..e48c523 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -156,6 +156,13 @@ config GPIO_F7188X To compile this driver as a module, choose M here: the module will be called f7188x-gpio. +config GPIO_MOXART + bool "MOXART GPIO support" + depends on ARCH_MOXART + help + Select this option to enable GPIO driver for + MOXA ART SoC devices. + config GPIO_MPC5200 def_bool y depends on PPC_MPC52xx diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index 7971e36..ee95154 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -46,6 +46,7 @@ obj-$(CONFIG_GPIO_MC9S08DZ60) += gpio-mc9s08dz60.o obj-$(CONFIG_GPIO_MCP23S08) += gpio-mcp23s08.o obj-$(CONFIG_GPIO_ML_IOH) += gpio-ml-ioh.o obj-$(CONFIG_GPIO_MM_LANTIQ) += gpio-mm-lantiq.o +obj-$(CONFIG_GPIO_MOXART) += gpio-moxart.o obj-$(CONFIG_GPIO_MPC5200) += gpio-mpc5200.o obj-$(CONFIG_GPIO_MPC8XXX) += gpio-mpc8xxx.o obj-$(CONFIG_GPIO_MSIC) += gpio-msic.o diff --git a/drivers/gpio/gpio-moxart.c b/drivers/gpio/gpio-moxart.c new file mode 100644 index 0000000..d662cde --- /dev/null +++ b/drivers/gpio/gpio-moxart.c @@ -0,0 +1,162 @@ +/* + * MOXA ART SoCs GPIO driver. + * + * Copyright (C) 2013 Jonas Jensen + * + * Jonas Jensen <jonas.jensen@xxxxxxxxx> + * + * 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/err.h> +#include <linux/init.h> +#include <linux/irq.h> +#include <linux/io.h> +#include <linux/gpio.h> +#include <linux/platform_device.h> +#include <linux/module.h> +#include <linux/of_address.h> +#include <linux/of_gpio.h> +#include <linux/pinctrl/consumer.h> +#include <linux/delay.h> +#include <linux/timer.h> +#include <linux/bitops.h> + +#define GPIO_DATA_OUT 0x00 +#define GPIO_DATA_IN 0x04 +#define GPIO_PIN_DIRECTION 0x08 + +struct moxart_gpio_chip { + struct gpio_chip gpio; + void __iomem *moxart_gpio_base; +}; + +static inline struct moxart_gpio_chip *to_moxart_gpio(struct gpio_chip *chip) +{ + return container_of(chip, struct moxart_gpio_chip, gpio); +} + +static int moxart_gpio_request(struct gpio_chip *chip, unsigned offset) +{ + return pinctrl_request_gpio(offset); +} + +static void moxart_gpio_free(struct gpio_chip *chip, unsigned offset) +{ + pinctrl_free_gpio(offset); +} + +static int moxart_gpio_direction_input(struct gpio_chip *chip, unsigned offset) +{ + struct moxart_gpio_chip *gc = to_moxart_gpio(chip); + void __iomem *ioaddr = gc->moxart_gpio_base + GPIO_PIN_DIRECTION; + + writel(readl(ioaddr) & ~BIT(offset), ioaddr); + return 0; +} + +static int moxart_gpio_direction_output(struct gpio_chip *chip, + unsigned offset, int value) +{ + struct moxart_gpio_chip *gc = to_moxart_gpio(chip); + void __iomem *ioaddr = gc->moxart_gpio_base + GPIO_PIN_DIRECTION; + + writel(readl(ioaddr) | BIT(offset), ioaddr); + return 0; +} + +static void moxart_gpio_set(struct gpio_chip *chip, unsigned offset, int value) +{ + struct moxart_gpio_chip *gc = to_moxart_gpio(chip); + void __iomem *ioaddr = gc->moxart_gpio_base + GPIO_DATA_OUT; + u32 reg = readl(ioaddr); + + if (value) + reg = reg | BIT(offset); + else + reg = reg & ~BIT(offset); + + + writel(reg, ioaddr); +} + +static int moxart_gpio_get(struct gpio_chip *chip, unsigned offset) +{ + struct moxart_gpio_chip *gc = to_moxart_gpio(chip); + u32 ret = readl(gc->moxart_gpio_base + GPIO_PIN_DIRECTION); + + if (ret & BIT(offset)) + return !!(readl(gc->moxart_gpio_base + GPIO_DATA_OUT) & + BIT(offset)); + else + return !!(readl(gc->moxart_gpio_base + GPIO_DATA_IN) & + BIT(offset)); +} + +static struct gpio_chip moxart_template_chip = { + .label = "moxart-gpio", + .request = moxart_gpio_request, + .free = moxart_gpio_free, + .direction_input = moxart_gpio_direction_input, + .direction_output = moxart_gpio_direction_output, + .set = moxart_gpio_set, + .get = moxart_gpio_get, + .base = 0, + .ngpio = 32, + .can_sleep = 0, +}; + +static int moxart_gpio_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct resource *res; + struct moxart_gpio_chip *mgc; + int ret; + + mgc = devm_kzalloc(dev, sizeof(*mgc), GFP_KERNEL); + if (!mgc) { + dev_err(dev, "can't allocate GPIO chip container\n"); + return -ENOMEM; + } + mgc->gpio = moxart_template_chip; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + mgc->moxart_gpio_base = devm_ioremap_resource(dev, res); + if (IS_ERR(mgc->moxart_gpio_base)) { + dev_err(dev, "%s: devm_ioremap_resource res_gpio failed\n", + dev->of_node->full_name); + return PTR_ERR(mgc->moxart_gpio_base); + } + + mgc->gpio.dev = dev; + + ret = gpiochip_add(&mgc->gpio); + if (ret) { + dev_err(dev, "%s: gpiochip_add failed\n", + dev->of_node->full_name); + return ret; + } + + return 0; +} + +static const struct of_device_id moxart_gpio_match[] = { + { .compatible = "moxa,moxart-gpio" }, + { } +}; + +static struct platform_driver moxart_gpio_driver = { + .driver = { + .name = "moxart-gpio", + .owner = THIS_MODULE, + .of_match_table = moxart_gpio_match, + }, + .probe = moxart_gpio_probe, +}; +module_platform_driver(moxart_gpio_driver); + +MODULE_DESCRIPTION("MOXART GPIO chip driver"); +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Jonas Jensen <jonas.jensen@xxxxxxxxx>"); -- 1.8.2.1 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html