Atheros AR5312 SoC have a builtin GPIO controller, which could be accessed via memory mapped registers. This patch adds new driver for them.
Signed-off-by: Sergey Ryazanov <[email protected]> Cc: Linus Walleij <[email protected]> Cc: Alexandre Courbot <[email protected]> Cc: [email protected] --- Changes since RFC: - move device registration to separate patch drivers/gpio/Kconfig | 7 +++ drivers/gpio/Makefile | 1 + drivers/gpio/gpio-ar5312.c | 121 +++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 129 insertions(+) create mode 100644 drivers/gpio/gpio-ar5312.c diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index 9de1515..7ce411b 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -112,6 +112,13 @@ config GPIO_MAX730X comment "Memory mapped GPIO drivers:" +config GPIO_AR5312 + bool "AR5312 SoC GPIO support" + default y if SOC_AR5312 + depends on SOC_AR5312 + help + Say yes here to enable GPIO support for Atheros AR5312/AR2312+ SoCs. + config GPIO_CLPS711X tristate "CLPS711X GPIO support" depends on ARCH_CLPS711X || COMPILE_TEST diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index 5d024e3..fae00f4 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -17,6 +17,7 @@ obj-$(CONFIG_GPIO_ADNP) += gpio-adnp.o obj-$(CONFIG_GPIO_ADP5520) += gpio-adp5520.o obj-$(CONFIG_GPIO_ADP5588) += gpio-adp5588.o obj-$(CONFIG_GPIO_AMD8111) += gpio-amd8111.o +obj-$(CONFIG_GPIO_AR5312) += gpio-ar5312.o obj-$(CONFIG_GPIO_ARIZONA) += gpio-arizona.o obj-$(CONFIG_GPIO_BCM_KONA) += gpio-bcm-kona.o obj-$(CONFIG_GPIO_BT8XX) += gpio-bt8xx.o diff --git a/drivers/gpio/gpio-ar5312.c b/drivers/gpio/gpio-ar5312.c new file mode 100644 index 0000000..27adb61 --- /dev/null +++ b/drivers/gpio/gpio-ar5312.c @@ -0,0 +1,121 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 2003 Atheros Communications, Inc., All Rights Reserved. + * Copyright (C) 2006 FON Technology, SL. + * Copyright (C) 2006 Imre Kaloz <[email protected]> + * Copyright (C) 2006-2009 Felix Fietkau <[email protected]> + * Copyright (C) 2012 Alexandros C. Couloumbis <[email protected]> + */ + +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/platform_device.h> +#include <linux/gpio.h> + +#define DRIVER_NAME "ar5312-gpio" + +#define AR5312_GPIO_DO 0x00 /* output register */ +#define AR5312_GPIO_DI 0x04 /* intput register */ +#define AR5312_GPIO_CR 0x08 /* control register */ + +#define AR5312_GPIO_CR_M(x) (1 << (x)) /* mask for i/o */ +#define AR5312_GPIO_CR_O(x) (0 << (x)) /* mask for output */ +#define AR5312_GPIO_CR_I(x) (1 << (x)) /* mask for input */ +#define AR5312_GPIO_CR_INT(x) (1 << ((x)+8)) /* mask for interrupt */ +#define AR5312_GPIO_CR_UART(x) (1 << ((x)+16)) /* uart multiplex */ + +#define AR5312_GPIO_NUM 8 + +static void __iomem *ar5312_mem; + +static inline u32 ar5312_gpio_reg_read(unsigned reg) +{ + return __raw_readl(ar5312_mem + reg); +} + +static inline void ar5312_gpio_reg_write(unsigned reg, u32 val) +{ + __raw_writel(val, ar5312_mem + reg); +} + +static inline void ar5312_gpio_reg_mask(unsigned reg, u32 mask, u32 val) +{ + ar5312_gpio_reg_write(reg, (ar5312_gpio_reg_read(reg) & ~mask) | val); +} + +static int ar5312_gpio_get_val(struct gpio_chip *chip, unsigned gpio) +{ + return (ar5312_gpio_reg_read(AR5312_GPIO_DI) >> gpio) & 1; +} + +static void ar5312_gpio_set_val(struct gpio_chip *chip, unsigned gpio, int val) +{ + u32 reg = ar5312_gpio_reg_read(AR5312_GPIO_DO); + + reg = val ? reg | (1 << gpio) : reg & ~(1 << gpio); + ar5312_gpio_reg_write(AR5312_GPIO_DO, reg); +} + +static int ar5312_gpio_dir_in(struct gpio_chip *chip, unsigned gpio) +{ + ar5312_gpio_reg_mask(AR5312_GPIO_CR, 0, 1 << gpio); + return 0; +} + +static int ar5312_gpio_dir_out(struct gpio_chip *chip, unsigned gpio, int val) +{ + ar5312_gpio_reg_mask(AR5312_GPIO_CR, 1 << gpio, 0); + ar5312_gpio_set_val(chip, gpio, val); + return 0; +} + +static struct gpio_chip ar5312_gpio_chip = { + .label = DRIVER_NAME, + .direction_input = ar5312_gpio_dir_in, + .direction_output = ar5312_gpio_dir_out, + .set = ar5312_gpio_set_val, + .get = ar5312_gpio_get_val, + .base = 0, + .ngpio = AR5312_GPIO_NUM, +}; + +static int ar5312_gpio_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct resource *res; + int ret; + + if (ar5312_mem) + return -EBUSY; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + ar5312_mem = devm_ioremap_resource(dev, res); + if (IS_ERR(ar5312_mem)) + return PTR_ERR(ar5312_mem); + + ar5312_gpio_chip.dev = dev; + ret = gpiochip_add(&ar5312_gpio_chip); + if (ret) { + dev_err(dev, "failed to add gpiochip\n"); + return ret; + } + + return 0; +} + +static struct platform_driver ar5312_gpio_driver = { + .probe = ar5312_gpio_probe, + .driver = { + .name = DRIVER_NAME, + .owner = THIS_MODULE, + } +}; + +static int __init ar5312_gpio_init(void) +{ + return platform_driver_register(&ar5312_gpio_driver); +} +subsys_initcall(ar5312_gpio_init); -- 1.8.5.5 -- To unsubscribe from this list: send the line "unsubscribe linux-gpio" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
