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/* linux/arch/arm/plat-s3c/include/plat/gpio-cfg.h
*
* 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 program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
/* 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__
typedef unsigned int __bitwise__ s3c_gpio_pull_t;
/* forward declaration if gpio-core.h hasn't been included */
struct s3c_gpio_chip;
/**
* struct s3c_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 configuraiton 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.
*/
struct s3c_gpio_cfg {
unsigned int cfg_eint;
s3c_gpio_pull_t (*get_pull)(struct s3c_gpio_chip *chip, unsigned offs);
int (*set_pull)(struct s3c_gpio_chip *chip, unsigned offs,
s3c_gpio_pull_t pull);
unsigned (*get_config)(struct s3c_gpio_chip *chip, unsigned offs);
int (*set_config)(struct s3c_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 s3c_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.
* @pin 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.
*/
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);
/* 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 dependant on the chip that is being
* used to whether the particular mode is available.
*/
#define S3C_GPIO_PULL_NONE ((__force s3c_gpio_pull_t)0x00)
#define S3C_GPIO_PULL_DOWN ((__force s3c_gpio_pull_t)0x01)
#define S3C_GPIO_PULL_UP ((__force s3c_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 successfull, or a negative error
* code if the pin cannot support the requested pull setting.
*/
extern int s3c_gpio_setpull(unsigned int pin, s3c_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 s3c_gpio_pull_t s3c_gpio_getpull(unsigned int pin);
#endif /* __PLAT_GPIO_CFG_H */
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