From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail-la0-x229.google.com ([2a00:1450:4010:c03::229]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1X0IUY-00036J-1r for barebox@lists.infradead.org; Thu, 26 Jun 2014 22:50:07 +0000 Received: by mail-la0-f41.google.com with SMTP id hz20so2399005lab.14 for ; Thu, 26 Jun 2014 15:49:42 -0700 (PDT) From: Antony Pavlov Date: Fri, 27 Jun 2014 02:49:30 +0400 Message-Id: <1403822973-3151-2-git-send-email-antonynpavlov@gmail.com> In-Reply-To: <1403822973-3151-1-git-send-email-antonynpavlov@gmail.com> References: <1403822973-3151-1-git-send-email-antonynpavlov@gmail.com> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "barebox" Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: [PATCH 1/4] gpio: add jz4740-gpio driver for Ingenic MIPS SoCs To: barebox@lists.infradead.org Signed-off-by: Antony Pavlov --- drivers/gpio/Kconfig | 6 ++ drivers/gpio/Makefile | 1 + drivers/gpio/gpio-jz4740.c | 140 +++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 147 insertions(+) diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index 45b8c53..f98a9c0 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -37,6 +37,12 @@ config GPIO_GENERIC_PLATFORM config GPIO_IMX def_bool ARCH_IMX +config GPIO_JZ4740 + bool "GPIO support for Ingenic SoCs" + depends on MACH_MIPS_XBURST + help + Say yes here to enable the GPIO driver for the Ingenic SoCs. + config GPIO_MALTA_FPGA_I2C bool "Malta CBUS FPGA I2C GPIO" depends on MACH_MIPS_MALTA diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index add6ffc..22d2ac0 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -5,6 +5,7 @@ obj-$(CONFIG_GPIO_DAVINCI) += gpio-davinci.o obj-$(CONFIG_GPIO_CLPS711X) += gpio-clps711x.o obj-$(CONFIG_GPIO_GENERIC) += gpio-generic.o obj-$(CONFIG_GPIO_IMX) += gpio-imx.o +obj-$(CONFIG_GPIO_JZ4740) += gpio-jz4740.o obj-$(CONFIG_GPIO_MALTA_FPGA_I2C) += gpio-malta-fpga-i2c.o obj-$(CONFIG_GPIO_ORION) += gpio-orion.o obj-$(CONFIG_GPIO_OMAP) += gpio-omap.o diff --git a/drivers/gpio/gpio-jz4740.c b/drivers/gpio/gpio-jz4740.c new file mode 100644 index 0000000..3c8efad --- /dev/null +++ b/drivers/gpio/gpio-jz4740.c @@ -0,0 +1,140 @@ +/* + * Copyright (C) 2013, 2014 Antony Pavlov + * + * Based on Linux JZ4740 platform GPIO support: + * Copyright (C) 2009-2010, Lars-Peter Clausen + * + * 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. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ + +#include +#include +#include +#include +#include + +#define JZ_REG_GPIO_PIN 0x00 +#define JZ_REG_GPIO_DATA 0x10 +#define JZ_REG_GPIO_DATA_SET 0x14 +#define JZ_REG_GPIO_DATA_CLEAR 0x18 +#define JZ_REG_GPIO_DIRECTION 0x60 +#define JZ_REG_GPIO_DIRECTION_SET 0x64 +#define JZ_REG_GPIO_DIRECTION_CLEAR 0x68 + +#define GPIO_TO_BIT(gpio) BIT(gpio & 0x1f) +#define CHIP_TO_REG(chip, reg) (gpio_chip_to_jz4740_gpio_chip(chip)->base + (reg)) + +struct jz4740_gpio_chip { + void __iomem *base; + struct gpio_chip chip; +}; + +static inline struct jz4740_gpio_chip *gpio_chip_to_jz4740_gpio_chip(struct gpio_chip *chip) +{ + return container_of(chip, struct jz4740_gpio_chip, chip); +} + +static int jz4740_gpio_get_value(struct gpio_chip *chip, unsigned gpio) +{ + return !!(readl(CHIP_TO_REG(chip, JZ_REG_GPIO_PIN)) & BIT(gpio)); +} + +static void jz4740_gpio_set_value(struct gpio_chip *chip, unsigned gpio, int value) +{ + uint32_t __iomem *reg = CHIP_TO_REG(chip, JZ_REG_GPIO_DATA_SET); + reg += !value; + writel(BIT(gpio), reg); +} + +static int jz4740_gpio_get_direction(struct gpio_chip *chip, unsigned gpio) +{ + if (readl(CHIP_TO_REG(chip, JZ_REG_GPIO_DIRECTION)) & BIT(gpio)) + return GPIOF_DIR_OUT; + + return GPIOF_DIR_IN; +} + +static int jz4740_gpio_direction_input(struct gpio_chip *chip, unsigned gpio) +{ + writel(BIT(gpio), CHIP_TO_REG(chip, JZ_REG_GPIO_DIRECTION_CLEAR)); + + return 0; +} + +static int jz4740_gpio_direction_output(struct gpio_chip *chip, unsigned gpio, + int value) +{ + jz4740_gpio_set_value(chip, gpio, value); + writel(BIT(gpio), CHIP_TO_REG(chip, JZ_REG_GPIO_DIRECTION_SET)); + + return 0; +} + +static struct gpio_ops jz4740_gpio_ops = { + .direction_input = jz4740_gpio_direction_input, + .direction_output = jz4740_gpio_direction_output, + .get_direction = jz4740_gpio_get_direction, + .get = jz4740_gpio_get_value, + .set = jz4740_gpio_set_value, +}; + +static int jz4740_gpio_probe(struct device_d *dev) +{ + void __iomem *base; + struct jz4740_gpio_chip *jz4740_gpio; + int ret; + + base = dev_request_mem_region(dev, 0); + if (!base) { + dev_err(dev, "could not get memory region\n"); + return -ENODEV; + } + + jz4740_gpio = xzalloc(sizeof(*jz4740_gpio)); + jz4740_gpio->base = base; + jz4740_gpio->chip.ops = &jz4740_gpio_ops; + jz4740_gpio->chip.base = -1; /* dev->id * 32; */ + jz4740_gpio->chip.ngpio = 32; + jz4740_gpio->chip.dev = dev; + + ret = gpiochip_add(&jz4740_gpio->chip); + if (ret) { + dev_err(dev, "couldn't add gpiochip\n"); + free(jz4740_gpio); + return ret; + } + + dev_dbg(dev, "probed gpiochip%d with base %d\n", + dev->id, jz4740_gpio->chip.base); + + return 0; +} + +static __maybe_unused struct of_device_id jz4740_gpio_dt_ids[] = { + { + .compatible = "ingenic,jz4740-gpio", + }, { + /* sentinel */ + }, +}; + +static struct driver_d jz4740_gpio_driver = { + .name = "jz4740-gpio", + .probe = jz4740_gpio_probe, + .of_compatible = DRV_OF_COMPAT(jz4740_gpio_dt_ids), +}; + +static int jz4740_gpio_init(void) +{ + return platform_driver_register(&jz4740_gpio_driver); +} +coredevice_initcall(jz4740_gpio_init); -- 1.9.2 _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox