| /* SPDX-License-Identifier: GPL-2.0 */ |
| /* |
| * Copyright 2008 Openmoko, Inc. |
| * Copyright 2008 Simtec Electronics |
| * http://armlinux.simtec.co.uk/ |
| * Ben Dooks <ben@simtec.co.uk> |
| * |
| * S3C Platform - GPIO pin configuration |
| */ |
| |
| /* This file contains the necessary definitions to get the basic gpio |
| * pin configuration done such as setting a pin to input or output or |
| * changing the pull-{up,down} configurations. |
| */ |
| |
| /* Note, this interface is being added to the s3c64xx arch first and will |
| * be added to the s3c24xx systems later. |
| */ |
| |
| #ifndef __PLAT_GPIO_CFG_H |
| #define __PLAT_GPIO_CFG_H __FILE__ |
| |
| #include <linux/types.h> |
| |
| typedef unsigned int __bitwise samsung_gpio_pull_t; |
| |
| /* forward declaration if gpio-core.h hasn't been included */ |
| struct samsung_gpio_chip; |
| |
| /** |
| * struct samsung_gpio_cfg GPIO configuration |
| * @cfg_eint: Configuration setting when used for external interrupt source |
| * @get_pull: Read the current pull configuration for the GPIO |
| * @set_pull: Set the current pull configuration for the GPIO |
| * @set_config: Set the current configuration for the GPIO |
| * @get_config: Read the current configuration for the GPIO |
| * |
| * Each chip can have more than one type of GPIO bank available and some |
| * have different capabilites even when they have the same control register |
| * layouts. Provide an point to vector control routine and provide any |
| * per-bank configuration information that other systems such as the |
| * external interrupt code will need. |
| * |
| * @sa samsung_gpio_cfgpin |
| * @sa s3c_gpio_getcfg |
| * @sa s3c_gpio_setpull |
| * @sa s3c_gpio_getpull |
| */ |
| struct samsung_gpio_cfg { |
| unsigned int cfg_eint; |
| |
| samsung_gpio_pull_t (*get_pull)(struct samsung_gpio_chip *chip, unsigned offs); |
| int (*set_pull)(struct samsung_gpio_chip *chip, unsigned offs, |
| samsung_gpio_pull_t pull); |
| |
| unsigned (*get_config)(struct samsung_gpio_chip *chip, unsigned offs); |
| int (*set_config)(struct samsung_gpio_chip *chip, unsigned offs, |
| unsigned config); |
| }; |
| |
| #define S3C_GPIO_SPECIAL_MARK (0xfffffff0) |
| #define S3C_GPIO_SPECIAL(x) (S3C_GPIO_SPECIAL_MARK | (x)) |
| |
| /* Defines for generic pin configurations */ |
| #define S3C_GPIO_INPUT (S3C_GPIO_SPECIAL(0)) |
| #define S3C_GPIO_OUTPUT (S3C_GPIO_SPECIAL(1)) |
| #define S3C_GPIO_SFN(x) (S3C_GPIO_SPECIAL(x)) |
| |
| #define samsung_gpio_is_cfg_special(_cfg) \ |
| (((_cfg) & S3C_GPIO_SPECIAL_MARK) == S3C_GPIO_SPECIAL_MARK) |
| |
| /** |
| * s3c_gpio_cfgpin() - Change the GPIO function of a pin. |
| * @pin pin The pin number to configure. |
| * @to to The configuration for the pin's function. |
| * |
| * Configure which function is actually connected to the external |
| * pin, such as an gpio input, output or some form of special function |
| * connected to an internal peripheral block. |
| * |
| * The @to parameter can be one of the generic S3C_GPIO_INPUT, S3C_GPIO_OUTPUT |
| * or S3C_GPIO_SFN() to indicate one of the possible values that the helper |
| * will then generate the correct bit mask and shift for the configuration. |
| * |
| * If a bank of GPIOs all needs to be set to special-function 2, then |
| * the following code will work: |
| * |
| * for (gpio = start; gpio < end; gpio++) |
| * s3c_gpio_cfgpin(gpio, S3C_GPIO_SFN(2)); |
| * |
| * The @to parameter can also be a specific value already shifted to the |
| * correct position in the control register, although these are discouraged |
| * in newer kernels and are only being kept for compatibility. |
| */ |
| extern int s3c_gpio_cfgpin(unsigned int pin, unsigned int to); |
| |
| /** |
| * s3c_gpio_getcfg - Read the current function for a GPIO pin |
| * @pin: The pin to read the configuration value for. |
| * |
| * Read the configuration state of the given @pin, returning a value that |
| * could be passed back to s3c_gpio_cfgpin(). |
| * |
| * @sa s3c_gpio_cfgpin |
| */ |
| extern unsigned s3c_gpio_getcfg(unsigned int pin); |
| |
| /** |
| * s3c_gpio_cfgpin_range() - Change the GPIO function for configuring pin range |
| * @start: The pin number to start at |
| * @nr: The number of pins to configure from @start. |
| * @cfg: The configuration for the pin's function |
| * |
| * Call s3c_gpio_cfgpin() for the @nr pins starting at @start. |
| * |
| * @sa s3c_gpio_cfgpin. |
| */ |
| extern int s3c_gpio_cfgpin_range(unsigned int start, unsigned int nr, |
| unsigned int cfg); |
| |
| /* Define values for the pull-{up,down} available for each gpio pin. |
| * |
| * These values control the state of the weak pull-{up,down} resistors |
| * available on most pins on the S3C series. Not all chips support both |
| * up or down settings, and it may be dependent on the chip that is being |
| * used to whether the particular mode is available. |
| */ |
| #define S3C_GPIO_PULL_NONE ((__force samsung_gpio_pull_t)0x00) |
| #define S3C_GPIO_PULL_DOWN ((__force samsung_gpio_pull_t)0x01) |
| #define S3C_GPIO_PULL_UP ((__force samsung_gpio_pull_t)0x02) |
| |
| /** |
| * s3c_gpio_setpull() - set the state of a gpio pin pull resistor |
| * @pin: The pin number to configure the pull resistor. |
| * @pull: The configuration for the pull resistor. |
| * |
| * This function sets the state of the pull-{up,down} resistor for the |
| * specified pin. It will return 0 if successful, or a negative error |
| * code if the pin cannot support the requested pull setting. |
| * |
| * @pull is one of S3C_GPIO_PULL_NONE, S3C_GPIO_PULL_DOWN or S3C_GPIO_PULL_UP. |
| */ |
| extern int s3c_gpio_setpull(unsigned int pin, samsung_gpio_pull_t pull); |
| |
| /** |
| * s3c_gpio_getpull() - get the pull resistor state of a gpio pin |
| * @pin: The pin number to get the settings for |
| * |
| * Read the pull resistor value for the specified pin. |
| */ |
| extern samsung_gpio_pull_t s3c_gpio_getpull(unsigned int pin); |
| |
| /* configure `all` aspects of an gpio */ |
| |
| /** |
| * s3c_gpio_cfgall_range() - configure range of gpio functtion and pull. |
| * @start: The gpio number to start at. |
| * @nr: The number of gpio to configure from @start. |
| * @cfg: The configuration to use |
| * @pull: The pull setting to use. |
| * |
| * Run s3c_gpio_cfgpin() and s3c_gpio_setpull() over the gpio range starting |
| * @gpio and running for @size. |
| * |
| * @sa s3c_gpio_cfgpin |
| * @sa s3c_gpio_setpull |
| * @sa s3c_gpio_cfgpin_range |
| */ |
| extern int s3c_gpio_cfgall_range(unsigned int start, unsigned int nr, |
| unsigned int cfg, samsung_gpio_pull_t pull); |
| |
| static inline int s3c_gpio_cfgrange_nopull(unsigned int pin, unsigned int size, |
| unsigned int cfg) |
| { |
| return s3c_gpio_cfgall_range(pin, size, cfg, S3C_GPIO_PULL_NONE); |
| } |
| |
| #endif /* __PLAT_GPIO_CFG_H */ |