From mboxrd@z Thu Jan 1 00:00:00 1970 From: Manivannan Sadhasivam Subject: [PATCH v3 08/10] gpio: Add gpio driver for Actions OWL S900 SoC Date: Wed, 28 Feb 2018 23:44:30 +0530 Message-ID: <20180228181432.26847-9-manivannan.sadhasivam@linaro.org> References: <20180228181432.26847-1-manivannan.sadhasivam@linaro.org> Return-path: In-Reply-To: <20180228181432.26847-1-manivannan.sadhasivam@linaro.org> Sender: linux-kernel-owner@vger.kernel.org To: linus.walleij@linaro.org, robh+dt@kernel.org, afaerber@suse.de Cc: liuwei@actions-semi.com, mp-cs@actions-semi.com, 96boards@ucrobotics.com, devicetree@vger.kernel.org, daniel.thompson@linaro.org, amit.kucheria@linaro.org, linux-arm-kernel@lists.infradead.org, linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, hzhang@ucrobotics.com, bdong@ucrobotics.com, manivannanece23@gmail.com, Manivannan Sadhasivam List-Id: linux-gpio@vger.kernel.org Add gpio driver for Actions Semi OWL family S900 SoC. Set of registers controlling the gpio shares the same register range with pinctrl block. GPIO registers are organized as 6 banks and each bank controls the maximum of 32 gpios. Signed-off-by: Manivannan Sadhasivam --- drivers/gpio/Kconfig | 8 ++ drivers/gpio/Makefile | 1 + drivers/gpio/gpio-owl.c | 218 ++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 227 insertions(+) create mode 100644 drivers/gpio/gpio-owl.c diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index 8dbb2280538d..09ceb98e2434 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -364,6 +364,14 @@ config GPIO_OMAP help Say yes here to enable GPIO support for TI OMAP SoCs. +config GPIO_OWL + tristate "Actions OWL GPIO support" + default ARCH_ACTIONS + depends on ARCH_ACTIONS || COMPILE_TEST + depends on OF_GPIO + help + Say yes here to enable GPIO support for Actions OWL SoCs. + config GPIO_PL061 bool "PrimeCell PL061 GPIO support" depends on ARM_AMBA diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index cccb0d40846c..b2bb11d4675f 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -91,6 +91,7 @@ obj-$(CONFIG_GPIO_MXC) += gpio-mxc.o obj-$(CONFIG_GPIO_MXS) += gpio-mxs.o obj-$(CONFIG_GPIO_OCTEON) += gpio-octeon.o obj-$(CONFIG_GPIO_OMAP) += gpio-omap.o +obj-$(CONFIG_GPIO_OWL) += gpio-owl.o obj-$(CONFIG_GPIO_PCA953X) += gpio-pca953x.o obj-$(CONFIG_GPIO_PCF857X) += gpio-pcf857x.o obj-$(CONFIG_GPIO_PCH) += gpio-pch.o diff --git a/drivers/gpio/gpio-owl.c b/drivers/gpio/gpio-owl.c new file mode 100644 index 000000000000..98f2e98197bc --- /dev/null +++ b/drivers/gpio/gpio-owl.c @@ -0,0 +1,218 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * OWL SoC's GPIO driver + * + * Copyright (c) 2018 Linaro Ltd. + * Author: Manivannan Sadhasivam + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define GPIO_OUTEN 0x0000 +#define GPIO_INEN 0x0004 +#define GPIO_DAT 0x0008 + +#define OWL_GPIO_PORT_A 0 +#define OWL_GPIO_PORT_B 1 +#define OWL_GPIO_PORT_C 2 +#define OWL_GPIO_PORT_D 3 +#define OWL_GPIO_PORT_E 4 +#define OWL_GPIO_PORT_F 5 + +struct owl_gpio_port { + const char *name; + unsigned int offset; + unsigned int pins; +}; + +struct owl_gpio { + struct gpio_chip gpio; + const struct owl_gpio_port *port; + void __iomem *base; + int id; +}; + +static void owl_gpio_set_reg(void __iomem *base, unsigned int pin, int flag) +{ + u32 val; + + val = readl_relaxed(base); + + if (flag) + val |= BIT(pin); + else + val &= ~BIT(pin); + + writel_relaxed(val, base); +} + +static int owl_gpio_request(struct gpio_chip *chip, unsigned int offset) +{ + struct owl_gpio *gpio = gpiochip_get_data(chip); + const struct owl_gpio_port *port = gpio->port; + void __iomem *gpio_base = gpio->base + port->offset; + + /* + * GPIOs have higher priority over other modules, so either setting + * them as OUT or IN is sufficient + */ + owl_gpio_set_reg(gpio_base + GPIO_OUTEN, offset, true); + + return 0; +} + +static void owl_gpio_free(struct gpio_chip *chip, unsigned int offset) +{ + struct owl_gpio *gpio = gpiochip_get_data(chip); + const struct owl_gpio_port *port = gpio->port; + void __iomem *gpio_base = gpio->base + port->offset; + + /* disable gpio output */ + owl_gpio_set_reg(gpio_base + GPIO_OUTEN, offset, false); + + /* disable gpio input */ + owl_gpio_set_reg(gpio_base + GPIO_INEN, offset, false); +} + +static int owl_gpio_get(struct gpio_chip *chip, unsigned int offset) +{ + struct owl_gpio *gpio = gpiochip_get_data(chip); + const struct owl_gpio_port *port = gpio->port; + void __iomem *gpio_base = gpio->base + port->offset; + u32 val; + + val = readl_relaxed(gpio_base + GPIO_DAT); + + return !!(val & BIT(offset)); +} + +static void owl_gpio_set(struct gpio_chip *chip, unsigned int offset, int value) +{ + struct owl_gpio *gpio = gpiochip_get_data(chip); + const struct owl_gpio_port *port = gpio->port; + void __iomem *gpio_base = gpio->base + port->offset; + u32 val; + + val = readl_relaxed(gpio_base + GPIO_DAT); + + if (value) + val |= BIT(offset); + else + val &= ~BIT(offset); + + writel_relaxed(val, gpio_base + GPIO_DAT); +} + +static int owl_gpio_direction_input(struct gpio_chip *chip, unsigned int offset) +{ + struct owl_gpio *gpio = gpiochip_get_data(chip); + const struct owl_gpio_port *port = gpio->port; + void __iomem *gpio_base = gpio->base + port->offset; + + owl_gpio_set_reg(gpio_base + GPIO_OUTEN, offset, false); + owl_gpio_set_reg(gpio_base + GPIO_INEN, offset, true); + + return 0; +} + +static int owl_gpio_direction_output(struct gpio_chip *chip, + unsigned int offset, int value) +{ + struct owl_gpio *gpio = gpiochip_get_data(chip); + const struct owl_gpio_port *port = gpio->port; + void __iomem *gpio_base = gpio->base + port->offset; + + owl_gpio_set_reg(gpio_base + GPIO_INEN, offset, false); + owl_gpio_set_reg(gpio_base + GPIO_OUTEN, offset, true); + owl_gpio_set(chip, offset, value); + + return 0; +} + +#define OWL_GPIO_PORT(port, base, count) \ + [OWL_GPIO_PORT_##port] = { \ + .name = #port, \ + .offset = base, \ + .pins = count, \ + } + +static const struct owl_gpio_port s900_gpio_ports[] = { + OWL_GPIO_PORT(A, 0x0000, 32), + OWL_GPIO_PORT(B, 0x000C, 32), + OWL_GPIO_PORT(C, 0x0018, 12), + OWL_GPIO_PORT(D, 0x0024, 30), + OWL_GPIO_PORT(E, 0x0030, 32), + OWL_GPIO_PORT(F, 0x00F0, 8), +}; + +static int owl_gpio_probe(struct platform_device *pdev) +{ + struct owl_gpio *gpio; + const struct owl_gpio_port *port; + int ret; + + gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL); + if (!gpio) + return -ENOMEM; + + gpio->base = of_iomap(pdev->dev.of_node, 0); + if (IS_ERR(gpio->base)) + return PTR_ERR(gpio->base); + + gpio->id = of_alias_get_id(pdev->dev.of_node, "gpio"); + if (gpio->id < 0) + return gpio->id; + + port = &s900_gpio_ports[gpio->id]; + + gpio->gpio.request = owl_gpio_request; + gpio->gpio.free = owl_gpio_free; + gpio->gpio.get = owl_gpio_get; + gpio->gpio.set = owl_gpio_set; + gpio->gpio.direction_input = owl_gpio_direction_input; + gpio->gpio.direction_output = owl_gpio_direction_output; + + gpio->gpio.base = -1; + gpio->gpio.parent = &pdev->dev; + gpio->gpio.label = port->name; + gpio->gpio.ngpio = port->pins; + + gpio->port = port; + + platform_set_drvdata(pdev, gpio); + + ret = devm_gpiochip_add_data(&pdev->dev, &gpio->gpio, gpio); + if (ret < 0) { + dev_err(&pdev->dev, "Failed to register gpiochip\n"); + return ret; + } + + return 0; +} + +static const struct of_device_id owl_gpio_of_match[] = { + { .compatible = "actions,s900-gpio", }, + { /* sentinel */ }, +}; +MODULE_DEVICE_TABLE(of, owl_gpio_of_match); + +static struct platform_driver owl_gpio_driver = { + .driver = { + .name = "owl-gpio", + .of_match_table = owl_gpio_of_match, + }, + .probe = owl_gpio_probe, +}; +module_platform_driver(owl_gpio_driver); + +MODULE_AUTHOR("Manivannan Sadhasivam "); +MODULE_DESCRIPTION("Actions Semi OWL SoCs GPIO driver"); +MODULE_LICENSE("GPL"); -- 2.14.1 From mboxrd@z Thu Jan 1 00:00:00 1970 From: manivannan.sadhasivam@linaro.org (Manivannan Sadhasivam) Date: Wed, 28 Feb 2018 23:44:30 +0530 Subject: [PATCH v3 08/10] gpio: Add gpio driver for Actions OWL S900 SoC In-Reply-To: <20180228181432.26847-1-manivannan.sadhasivam@linaro.org> References: <20180228181432.26847-1-manivannan.sadhasivam@linaro.org> Message-ID: <20180228181432.26847-9-manivannan.sadhasivam@linaro.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Add gpio driver for Actions Semi OWL family S900 SoC. Set of registers controlling the gpio shares the same register range with pinctrl block. GPIO registers are organized as 6 banks and each bank controls the maximum of 32 gpios. Signed-off-by: Manivannan Sadhasivam --- drivers/gpio/Kconfig | 8 ++ drivers/gpio/Makefile | 1 + drivers/gpio/gpio-owl.c | 218 ++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 227 insertions(+) create mode 100644 drivers/gpio/gpio-owl.c diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index 8dbb2280538d..09ceb98e2434 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -364,6 +364,14 @@ config GPIO_OMAP help Say yes here to enable GPIO support for TI OMAP SoCs. +config GPIO_OWL + tristate "Actions OWL GPIO support" + default ARCH_ACTIONS + depends on ARCH_ACTIONS || COMPILE_TEST + depends on OF_GPIO + help + Say yes here to enable GPIO support for Actions OWL SoCs. + config GPIO_PL061 bool "PrimeCell PL061 GPIO support" depends on ARM_AMBA diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index cccb0d40846c..b2bb11d4675f 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -91,6 +91,7 @@ obj-$(CONFIG_GPIO_MXC) += gpio-mxc.o obj-$(CONFIG_GPIO_MXS) += gpio-mxs.o obj-$(CONFIG_GPIO_OCTEON) += gpio-octeon.o obj-$(CONFIG_GPIO_OMAP) += gpio-omap.o +obj-$(CONFIG_GPIO_OWL) += gpio-owl.o obj-$(CONFIG_GPIO_PCA953X) += gpio-pca953x.o obj-$(CONFIG_GPIO_PCF857X) += gpio-pcf857x.o obj-$(CONFIG_GPIO_PCH) += gpio-pch.o diff --git a/drivers/gpio/gpio-owl.c b/drivers/gpio/gpio-owl.c new file mode 100644 index 000000000000..98f2e98197bc --- /dev/null +++ b/drivers/gpio/gpio-owl.c @@ -0,0 +1,218 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * OWL SoC's GPIO driver + * + * Copyright (c) 2018 Linaro Ltd. + * Author: Manivannan Sadhasivam + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define GPIO_OUTEN 0x0000 +#define GPIO_INEN 0x0004 +#define GPIO_DAT 0x0008 + +#define OWL_GPIO_PORT_A 0 +#define OWL_GPIO_PORT_B 1 +#define OWL_GPIO_PORT_C 2 +#define OWL_GPIO_PORT_D 3 +#define OWL_GPIO_PORT_E 4 +#define OWL_GPIO_PORT_F 5 + +struct owl_gpio_port { + const char *name; + unsigned int offset; + unsigned int pins; +}; + +struct owl_gpio { + struct gpio_chip gpio; + const struct owl_gpio_port *port; + void __iomem *base; + int id; +}; + +static void owl_gpio_set_reg(void __iomem *base, unsigned int pin, int flag) +{ + u32 val; + + val = readl_relaxed(base); + + if (flag) + val |= BIT(pin); + else + val &= ~BIT(pin); + + writel_relaxed(val, base); +} + +static int owl_gpio_request(struct gpio_chip *chip, unsigned int offset) +{ + struct owl_gpio *gpio = gpiochip_get_data(chip); + const struct owl_gpio_port *port = gpio->port; + void __iomem *gpio_base = gpio->base + port->offset; + + /* + * GPIOs have higher priority over other modules, so either setting + * them as OUT or IN is sufficient + */ + owl_gpio_set_reg(gpio_base + GPIO_OUTEN, offset, true); + + return 0; +} + +static void owl_gpio_free(struct gpio_chip *chip, unsigned int offset) +{ + struct owl_gpio *gpio = gpiochip_get_data(chip); + const struct owl_gpio_port *port = gpio->port; + void __iomem *gpio_base = gpio->base + port->offset; + + /* disable gpio output */ + owl_gpio_set_reg(gpio_base + GPIO_OUTEN, offset, false); + + /* disable gpio input */ + owl_gpio_set_reg(gpio_base + GPIO_INEN, offset, false); +} + +static int owl_gpio_get(struct gpio_chip *chip, unsigned int offset) +{ + struct owl_gpio *gpio = gpiochip_get_data(chip); + const struct owl_gpio_port *port = gpio->port; + void __iomem *gpio_base = gpio->base + port->offset; + u32 val; + + val = readl_relaxed(gpio_base + GPIO_DAT); + + return !!(val & BIT(offset)); +} + +static void owl_gpio_set(struct gpio_chip *chip, unsigned int offset, int value) +{ + struct owl_gpio *gpio = gpiochip_get_data(chip); + const struct owl_gpio_port *port = gpio->port; + void __iomem *gpio_base = gpio->base + port->offset; + u32 val; + + val = readl_relaxed(gpio_base + GPIO_DAT); + + if (value) + val |= BIT(offset); + else + val &= ~BIT(offset); + + writel_relaxed(val, gpio_base + GPIO_DAT); +} + +static int owl_gpio_direction_input(struct gpio_chip *chip, unsigned int offset) +{ + struct owl_gpio *gpio = gpiochip_get_data(chip); + const struct owl_gpio_port *port = gpio->port; + void __iomem *gpio_base = gpio->base + port->offset; + + owl_gpio_set_reg(gpio_base + GPIO_OUTEN, offset, false); + owl_gpio_set_reg(gpio_base + GPIO_INEN, offset, true); + + return 0; +} + +static int owl_gpio_direction_output(struct gpio_chip *chip, + unsigned int offset, int value) +{ + struct owl_gpio *gpio = gpiochip_get_data(chip); + const struct owl_gpio_port *port = gpio->port; + void __iomem *gpio_base = gpio->base + port->offset; + + owl_gpio_set_reg(gpio_base + GPIO_INEN, offset, false); + owl_gpio_set_reg(gpio_base + GPIO_OUTEN, offset, true); + owl_gpio_set(chip, offset, value); + + return 0; +} + +#define OWL_GPIO_PORT(port, base, count) \ + [OWL_GPIO_PORT_##port] = { \ + .name = #port, \ + .offset = base, \ + .pins = count, \ + } + +static const struct owl_gpio_port s900_gpio_ports[] = { + OWL_GPIO_PORT(A, 0x0000, 32), + OWL_GPIO_PORT(B, 0x000C, 32), + OWL_GPIO_PORT(C, 0x0018, 12), + OWL_GPIO_PORT(D, 0x0024, 30), + OWL_GPIO_PORT(E, 0x0030, 32), + OWL_GPIO_PORT(F, 0x00F0, 8), +}; + +static int owl_gpio_probe(struct platform_device *pdev) +{ + struct owl_gpio *gpio; + const struct owl_gpio_port *port; + int ret; + + gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL); + if (!gpio) + return -ENOMEM; + + gpio->base = of_iomap(pdev->dev.of_node, 0); + if (IS_ERR(gpio->base)) + return PTR_ERR(gpio->base); + + gpio->id = of_alias_get_id(pdev->dev.of_node, "gpio"); + if (gpio->id < 0) + return gpio->id; + + port = &s900_gpio_ports[gpio->id]; + + gpio->gpio.request = owl_gpio_request; + gpio->gpio.free = owl_gpio_free; + gpio->gpio.get = owl_gpio_get; + gpio->gpio.set = owl_gpio_set; + gpio->gpio.direction_input = owl_gpio_direction_input; + gpio->gpio.direction_output = owl_gpio_direction_output; + + gpio->gpio.base = -1; + gpio->gpio.parent = &pdev->dev; + gpio->gpio.label = port->name; + gpio->gpio.ngpio = port->pins; + + gpio->port = port; + + platform_set_drvdata(pdev, gpio); + + ret = devm_gpiochip_add_data(&pdev->dev, &gpio->gpio, gpio); + if (ret < 0) { + dev_err(&pdev->dev, "Failed to register gpiochip\n"); + return ret; + } + + return 0; +} + +static const struct of_device_id owl_gpio_of_match[] = { + { .compatible = "actions,s900-gpio", }, + { /* sentinel */ }, +}; +MODULE_DEVICE_TABLE(of, owl_gpio_of_match); + +static struct platform_driver owl_gpio_driver = { + .driver = { + .name = "owl-gpio", + .of_match_table = owl_gpio_of_match, + }, + .probe = owl_gpio_probe, +}; +module_platform_driver(owl_gpio_driver); + +MODULE_AUTHOR("Manivannan Sadhasivam "); +MODULE_DESCRIPTION("Actions Semi OWL SoCs GPIO driver"); +MODULE_LICENSE("GPL"); -- 2.14.1