From f141ed65f256ec036c7fba604da6b7c448096ef9 Mon Sep 17 00:00:00 2001 From: Grant Likely Date: Sat, 7 Apr 2012 14:31:33 -0600 Subject: gpio: Move DT support code into drivers/gpio The code in drivers/of/gpio.c isn't shared by any other subsystem since it is all gpiolib specific. drivers/gpio is a better place to maintain these functions. Signed-off-by: Grant Likely Cc: Rob Herring Cc: Linus Walleij diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index e6862f1..1042c3f 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -37,6 +37,10 @@ menuconfig GPIOLIB if GPIOLIB +config OF_GPIO + def_bool y + depends on OF && !SPARC + config DEBUG_GPIO bool "Debug GPIO calls" depends on DEBUG_KERNEL diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index 007f54b..1c2f6c0 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -3,6 +3,7 @@ ccflags-$(CONFIG_DEBUG_GPIO) += -DDEBUG obj-$(CONFIG_GPIOLIB) += gpiolib.o devres.o +obj-$(CONFIG_OF_GPIO) += gpiolib-of.o # Device drivers. Generally keep list sorted alphabetically obj-$(CONFIG_GPIO_GENERIC) += gpio-generic.o diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c new file mode 100644 index 0000000..bba8121 --- /dev/null +++ b/drivers/gpio/gpiolib-of.c @@ -0,0 +1,240 @@ +/* + * OF helpers for the GPIO API + * + * Copyright (c) 2007-2008 MontaVista Software, Inc. + * + * Author: Anton Vorontsov + * + * 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. + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +/** + * of_get_named_gpio_flags() - Get a GPIO number and flags to use with GPIO API + * @np: device node to get GPIO from + * @propname: property name containing gpio specifier(s) + * @index: index of the GPIO + * @flags: a flags pointer to fill in + * + * Returns GPIO number to use with Linux generic GPIO API, or one of the errno + * value on the error condition. If @flags is not NULL the function also fills + * in flags for the GPIO. + */ +int of_get_named_gpio_flags(struct device_node *np, const char *propname, + int index, enum of_gpio_flags *flags) +{ + int ret; + struct gpio_chip *gc; + struct of_phandle_args gpiospec; + + ret = of_parse_phandle_with_args(np, propname, "#gpio-cells", index, + &gpiospec); + if (ret) { + pr_debug("%s: can't parse gpios property\n", __func__); + goto err0; + } + + gc = of_node_to_gpiochip(gpiospec.np); + if (!gc) { + pr_debug("%s: gpio controller %s isn't registered\n", + np->full_name, gpiospec.np->full_name); + ret = -ENODEV; + goto err1; + } + + if (gpiospec.args_count != gc->of_gpio_n_cells) { + pr_debug("%s: wrong #gpio-cells for %s\n", + np->full_name, gpiospec.np->full_name); + ret = -EINVAL; + goto err1; + } + + /* .xlate might decide to not fill in the flags, so clear it. */ + if (flags) + *flags = 0; + + ret = gc->of_xlate(gc, &gpiospec, flags); + if (ret < 0) + goto err1; + + ret += gc->base; +err1: + of_node_put(gpiospec.np); +err0: + pr_debug("%s exited with status %d\n", __func__, ret); + return ret; +} +EXPORT_SYMBOL(of_get_named_gpio_flags); + +/** + * of_gpio_named_count - Count GPIOs for a device + * @np: device node to count GPIOs for + * @propname: property name containing gpio specifier(s) + * + * The function returns the count of GPIOs specified for a node. + * + * Note that the empty GPIO specifiers counts too. For example, + * + * gpios = <0 + * &pio1 1 2 + * 0 + * &pio2 3 4>; + * + * defines four GPIOs (so this function will return 4), two of which + * are not specified. + */ +unsigned int of_gpio_named_count(struct device_node *np, const char* propname) +{ + unsigned int cnt = 0; + + do { + int ret; + + ret = of_parse_phandle_with_args(np, propname, "#gpio-cells", + cnt, NULL); + /* A hole in the gpios = <> counts anyway. */ + if (ret < 0 && ret != -EEXIST) + break; + } while (++cnt); + + return cnt; +} +EXPORT_SYMBOL(of_gpio_named_count); + +/** + * of_gpio_simple_xlate - translate gpio_spec to the GPIO number and flags + * @gc: pointer to the gpio_chip structure + * @np: device node of the GPIO chip + * @gpio_spec: gpio specifier as found in the device tree + * @flags: a flags pointer to fill in + * + * This is simple translation function, suitable for the most 1:1 mapped + * gpio chips. This function performs only one sanity check: whether gpio + * is less than ngpios (that is specified in the gpio_chip). + */ +int of_gpio_simple_xlate(struct gpio_chip *gc, + const struct of_phandle_args *gpiospec, u32 *flags) +{ + /* + * We're discouraging gpio_cells < 2, since that way you'll have to + * write your own xlate function (that will have to retrive the GPIO + * number and the flags from a single gpio cell -- this is possible, + * but not recommended). + */ + if (gc->of_gpio_n_cells < 2) { + WARN_ON(1); + return -EINVAL; + } + + if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells)) + return -EINVAL; + + if (gpiospec->args[0] > gc->ngpio) + return -EINVAL; + + if (flags) + *flags = gpiospec->args[1]; + + return gpiospec->args[0]; +} +EXPORT_SYMBOL(of_gpio_simple_xlate); + +/** + * of_mm_gpiochip_add - Add memory mapped GPIO chip (bank) + * @np: device node of the GPIO chip + * @mm_gc: pointer to the of_mm_gpio_chip allocated structure + * + * To use this function you should allocate and fill mm_gc with: + * + * 1) In the gpio_chip structure: + * - all the callbacks + * - of_gpio_n_cells + * - of_xlate callback (optional) + * + * 3) In the of_mm_gpio_chip structure: + * - save_regs callback (optional) + * + * If succeeded, this function will map bank's memory and will + * do all necessary work for you. Then you'll able to use .regs + * to manage GPIOs from the callbacks. + */ +int of_mm_gpiochip_add(struct device_node *np, + struct of_mm_gpio_chip *mm_gc) +{ + int ret = -ENOMEM; + struct gpio_chip *gc = &mm_gc->gc; + + gc->label = kstrdup(np->full_name, GFP_KERNEL); + if (!gc->label) + goto err0; + + mm_gc->regs = of_iomap(np, 0); + if (!mm_gc->regs) + goto err1; + + gc->base = -1; + + if (mm_gc->save_regs) + mm_gc->save_regs(mm_gc); + + mm_gc->gc.of_node = np; + + ret = gpiochip_add(gc); + if (ret) + goto err2; + + return 0; +err2: + iounmap(mm_gc->regs); +err1: + kfree(gc->label); +err0: + pr_err("%s: GPIO chip registration failed with status %d\n", + np->full_name, ret); + return ret; +} +EXPORT_SYMBOL(of_mm_gpiochip_add); + +void of_gpiochip_add(struct gpio_chip *chip) +{ + if ((!chip->of_node) && (chip->dev)) + chip->of_node = chip->dev->of_node; + + if (!chip->of_node) + return; + + if (!chip->of_xlate) { + chip->of_gpio_n_cells = 2; + chip->of_xlate = of_gpio_simple_xlate; + } + + of_node_get(chip->of_node); +} + +void of_gpiochip_remove(struct gpio_chip *chip) +{ + if (chip->of_node) + of_node_put(chip->of_node); +} + +/* Private function for resolving node pointer to gpio_chip */ +static int of_gpiochip_is_match(struct gpio_chip *chip, const void *data) +{ + return chip->of_node == data; +} + +struct gpio_chip *of_node_to_gpiochip(struct device_node *np) +{ + return gpiochip_find(np, of_gpiochip_is_match); +} diff --git a/drivers/of/Kconfig b/drivers/of/Kconfig index 8e84ce9..ce00d11 100644 --- a/drivers/of/Kconfig +++ b/drivers/of/Kconfig @@ -51,12 +51,6 @@ config OF_IRQ config OF_DEVICE def_bool y -config OF_GPIO - def_bool y - depends on GPIOLIB && !SPARC - help - OpenFirmware GPIO accessors - config OF_I2C def_tristate I2C depends on I2C && !SPARC diff --git a/drivers/of/Makefile b/drivers/of/Makefile index aa90e60..aff2c62 100644 --- a/drivers/of/Makefile +++ b/drivers/of/Makefile @@ -4,7 +4,6 @@ obj-$(CONFIG_OF_PROMTREE) += pdt.o obj-$(CONFIG_OF_ADDRESS) += address.o obj-$(CONFIG_OF_IRQ) += irq.o obj-$(CONFIG_OF_DEVICE) += device.o platform.o -obj-$(CONFIG_OF_GPIO) += gpio.o obj-$(CONFIG_OF_I2C) += of_i2c.o obj-$(CONFIG_OF_NET) += of_net.o obj-$(CONFIG_OF_SPI) += of_spi.o diff --git a/drivers/of/gpio.c b/drivers/of/gpio.c deleted file mode 100644 index bba8121..0000000 --- a/drivers/of/gpio.c +++ /dev/null @@ -1,240 +0,0 @@ -/* - * OF helpers for the GPIO API - * - * Copyright (c) 2007-2008 MontaVista Software, Inc. - * - * Author: Anton Vorontsov - * - * 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. - */ - -#include -#include -#include -#include -#include -#include -#include -#include - -/** - * of_get_named_gpio_flags() - Get a GPIO number and flags to use with GPIO API - * @np: device node to get GPIO from - * @propname: property name containing gpio specifier(s) - * @index: index of the GPIO - * @flags: a flags pointer to fill in - * - * Returns GPIO number to use with Linux generic GPIO API, or one of the errno - * value on the error condition. If @flags is not NULL the function also fills - * in flags for the GPIO. - */ -int of_get_named_gpio_flags(struct device_node *np, const char *propname, - int index, enum of_gpio_flags *flags) -{ - int ret; - struct gpio_chip *gc; - struct of_phandle_args gpiospec; - - ret = of_parse_phandle_with_args(np, propname, "#gpio-cells", index, - &gpiospec); - if (ret) { - pr_debug("%s: can't parse gpios property\n", __func__); - goto err0; - } - - gc = of_node_to_gpiochip(gpiospec.np); - if (!gc) { - pr_debug("%s: gpio controller %s isn't registered\n", - np->full_name, gpiospec.np->full_name); - ret = -ENODEV; - goto err1; - } - - if (gpiospec.args_count != gc->of_gpio_n_cells) { - pr_debug("%s: wrong #gpio-cells for %s\n", - np->full_name, gpiospec.np->full_name); - ret = -EINVAL; - goto err1; - } - - /* .xlate might decide to not fill in the flags, so clear it. */ - if (flags) - *flags = 0; - - ret = gc->of_xlate(gc, &gpiospec, flags); - if (ret < 0) - goto err1; - - ret += gc->base; -err1: - of_node_put(gpiospec.np); -err0: - pr_debug("%s exited with status %d\n", __func__, ret); - return ret; -} -EXPORT_SYMBOL(of_get_named_gpio_flags); - -/** - * of_gpio_named_count - Count GPIOs for a device - * @np: device node to count GPIOs for - * @propname: property name containing gpio specifier(s) - * - * The function returns the count of GPIOs specified for a node. - * - * Note that the empty GPIO specifiers counts too. For example, - * - * gpios = <0 - * &pio1 1 2 - * 0 - * &pio2 3 4>; - * - * defines four GPIOs (so this function will return 4), two of which - * are not specified. - */ -unsigned int of_gpio_named_count(struct device_node *np, const char* propname) -{ - unsigned int cnt = 0; - - do { - int ret; - - ret = of_parse_phandle_with_args(np, propname, "#gpio-cells", - cnt, NULL); - /* A hole in the gpios = <> counts anyway. */ - if (ret < 0 && ret != -EEXIST) - break; - } while (++cnt); - - return cnt; -} -EXPORT_SYMBOL(of_gpio_named_count); - -/** - * of_gpio_simple_xlate - translate gpio_spec to the GPIO number and flags - * @gc: pointer to the gpio_chip structure - * @np: device node of the GPIO chip - * @gpio_spec: gpio specifier as found in the device tree - * @flags: a flags pointer to fill in - * - * This is simple translation function, suitable for the most 1:1 mapped - * gpio chips. This function performs only one sanity check: whether gpio - * is less than ngpios (that is specified in the gpio_chip). - */ -int of_gpio_simple_xlate(struct gpio_chip *gc, - const struct of_phandle_args *gpiospec, u32 *flags) -{ - /* - * We're discouraging gpio_cells < 2, since that way you'll have to - * write your own xlate function (that will have to retrive the GPIO - * number and the flags from a single gpio cell -- this is possible, - * but not recommended). - */ - if (gc->of_gpio_n_cells < 2) { - WARN_ON(1); - return -EINVAL; - } - - if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells)) - return -EINVAL; - - if (gpiospec->args[0] > gc->ngpio) - return -EINVAL; - - if (flags) - *flags = gpiospec->args[1]; - - return gpiospec->args[0]; -} -EXPORT_SYMBOL(of_gpio_simple_xlate); - -/** - * of_mm_gpiochip_add - Add memory mapped GPIO chip (bank) - * @np: device node of the GPIO chip - * @mm_gc: pointer to the of_mm_gpio_chip allocated structure - * - * To use this function you should allocate and fill mm_gc with: - * - * 1) In the gpio_chip structure: - * - all the callbacks - * - of_gpio_n_cells - * - of_xlate callback (optional) - * - * 3) In the of_mm_gpio_chip structure: - * - save_regs callback (optional) - * - * If succeeded, this function will map bank's memory and will - * do all necessary work for you. Then you'll able to use .regs - * to manage GPIOs from the callbacks. - */ -int of_mm_gpiochip_add(struct device_node *np, - struct of_mm_gpio_chip *mm_gc) -{ - int ret = -ENOMEM; - struct gpio_chip *gc = &mm_gc->gc; - - gc->label = kstrdup(np->full_name, GFP_KERNEL); - if (!gc->label) - goto err0; - - mm_gc->regs = of_iomap(np, 0); - if (!mm_gc->regs) - goto err1; - - gc->base = -1; - - if (mm_gc->save_regs) - mm_gc->save_regs(mm_gc); - - mm_gc->gc.of_node = np; - - ret = gpiochip_add(gc); - if (ret) - goto err2; - - return 0; -err2: - iounmap(mm_gc->regs); -err1: - kfree(gc->label); -err0: - pr_err("%s: GPIO chip registration failed with status %d\n", - np->full_name, ret); - return ret; -} -EXPORT_SYMBOL(of_mm_gpiochip_add); - -void of_gpiochip_add(struct gpio_chip *chip) -{ - if ((!chip->of_node) && (chip->dev)) - chip->of_node = chip->dev->of_node; - - if (!chip->of_node) - return; - - if (!chip->of_xlate) { - chip->of_gpio_n_cells = 2; - chip->of_xlate = of_gpio_simple_xlate; - } - - of_node_get(chip->of_node); -} - -void of_gpiochip_remove(struct gpio_chip *chip) -{ - if (chip->of_node) - of_node_put(chip->of_node); -} - -/* Private function for resolving node pointer to gpio_chip */ -static int of_gpiochip_is_match(struct gpio_chip *chip, const void *data) -{ - return chip->of_node == data; -} - -struct gpio_chip *of_node_to_gpiochip(struct device_node *np) -{ - return gpiochip_find(np, of_gpiochip_is_match); -} -- cgit v0.10.2