177 lines
6.1 KiB
C
177 lines
6.1 KiB
C
/* linux/arch/arm/plat-s3c/include/plat/gpio-cfg-helper.h
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*
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* Copyright 2008 Openmoko, Inc.
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* Copyright 2008 Simtec Electronics
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* http://armlinux.simtec.co.uk/
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* Ben Dooks <ben@simtec.co.uk>
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*
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* S3C Platform - GPIO pin configuration helper definitions
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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/* This is meant for core cpu support, machine or other driver files
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* should not be including this header.
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*/
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#ifndef __PLAT_GPIO_CFG_HELPERS_H
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#define __PLAT_GPIO_CFG_HELPERS_H __FILE__
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/* As a note, all gpio configuration functions are entered exclusively, either
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* with the relevant lock held or the system prevented from doing anything else
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* by disabling interrupts.
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*/
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static inline int s3c_gpio_do_setcfg(struct s3c_gpio_chip *chip,
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unsigned int off, unsigned int config)
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{
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return (chip->config->set_config)(chip, off, config);
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}
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static inline int s3c_gpio_do_setpull(struct s3c_gpio_chip *chip,
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unsigned int off, s3c_gpio_pull_t pull)
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{
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return (chip->config->set_pull)(chip, off, pull);
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}
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/**
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* s3c_gpio_setcfg_s3c24xx - S3C24XX style GPIO configuration.
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* @chip: The gpio chip that is being configured.
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* @off: The offset for the GPIO being configured.
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* @cfg: The configuration value to set.
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*
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* This helper deal with the GPIO cases where the control register
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* has two bits of configuration per gpio, which have the following
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* functions:
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* 00 = input
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* 01 = output
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* 1x = special function
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*/
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extern int s3c_gpio_setcfg_s3c24xx(struct s3c_gpio_chip *chip,
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unsigned int off, unsigned int cfg);
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/**
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* s3c_gpio_setcfg_s3c24xx_a - S3C24XX style GPIO configuration (Bank A)
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* @chip: The gpio chip that is being configured.
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* @off: The offset for the GPIO being configured.
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* @cfg: The configuration value to set.
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*
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* This helper deal with the GPIO cases where the control register
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* has one bit of configuration for the gpio, where setting the bit
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* means the pin is in special function mode and unset means output.
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*/
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extern int s3c_gpio_setcfg_s3c24xx_a(struct s3c_gpio_chip *chip,
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unsigned int off, unsigned int cfg);
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/**
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* s3c_gpio_setcfg_s3c64xx_4bit - S3C64XX 4bit single register GPIO config.
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* @chip: The gpio chip that is being configured.
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* @off: The offset for the GPIO being configured.
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* @cfg: The configuration value to set.
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*
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* This helper deal with the GPIO cases where the control register has 4 bits
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* of control per GPIO, generally in the form of:
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* 0000 = Input
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* 0001 = Output
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* others = Special functions (dependant on bank)
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*
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* Note, since the code to deal with the case where there are two control
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* registers instead of one, we do not have a seperate set of functions for
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* each case.
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*/
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extern int s3c_gpio_setcfg_s3c64xx_4bit(struct s3c_gpio_chip *chip,
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unsigned int off, unsigned int cfg);
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/* Pull-{up,down} resistor controls.
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*
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* S3C2410,S3C2440,S3C24A0 = Pull-UP,
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* S3C2412,S3C2413 = Pull-Down
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* S3C6400,S3C6410 = Pull-Both [None,Down,Up,Undef]
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* S3C2443 = Pull-Both [not same as S3C6400]
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*/
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/**
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* s3c_gpio_setpull_1up() - Pull configuration for choice of up or none.
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* @chip: The gpio chip that is being configured.
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* @off: The offset for the GPIO being configured.
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* @param: pull: The pull mode being requested.
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*
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* This is a helper function for the case where we have GPIOs with one
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* bit configuring the presence of a pull-up resistor.
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*/
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extern int s3c_gpio_setpull_1up(struct s3c_gpio_chip *chip,
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unsigned int off, s3c_gpio_pull_t pull);
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/**
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* s3c_gpio_setpull_1down() - Pull configuration for choice of down or none
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* @chip: The gpio chip that is being configured
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* @off: The offset for the GPIO being configured
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* @param: pull: The pull mode being requested
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*
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* This is a helper function for the case where we have GPIOs with one
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* bit configuring the presence of a pull-down resistor.
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*/
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extern int s3c_gpio_setpull_1down(struct s3c_gpio_chip *chip,
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unsigned int off, s3c_gpio_pull_t pull);
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/**
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* s3c_gpio_setpull_upown() - Pull configuration for choice of up, down or none
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* @chip: The gpio chip that is being configured.
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* @off: The offset for the GPIO being configured.
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* @param: pull: The pull mode being requested.
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*
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* This is a helper function for the case where we have GPIOs with two
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* bits configuring the presence of a pull resistor, in the following
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* order:
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* 00 = No pull resistor connected
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* 01 = Pull-up resistor connected
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* 10 = Pull-down resistor connected
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*/
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extern int s3c_gpio_setpull_updown(struct s3c_gpio_chip *chip,
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unsigned int off, s3c_gpio_pull_t pull);
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/**
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* s3c_gpio_getpull_updown() - Get configuration for choice of up, down or none
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* @chip: The gpio chip that the GPIO pin belongs to
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* @off: The offset to the pin to get the configuration of.
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*
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* This helper function reads the state of the pull-{up,down} resistor for the
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* given GPIO in the same case as s3c_gpio_setpull_upown.
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*/
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extern s3c_gpio_pull_t s3c_gpio_getpull_updown(struct s3c_gpio_chip *chip,
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unsigned int off);
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/**
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* s3c_gpio_setpull_s3c2443() - Pull configuration for s3c2443.
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* @chip: The gpio chip that is being configured.
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* @off: The offset for the GPIO being configured.
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* @param: pull: The pull mode being requested.
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*
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* This is a helper function for the case where we have GPIOs with two
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* bits configuring the presence of a pull resistor, in the following
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* order:
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* 00 = Pull-up resistor connected
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* 10 = Pull-down resistor connected
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* x1 = No pull up resistor
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*/
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extern int s3c_gpio_setpull_s3c2443(struct s3c_gpio_chip *chip,
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unsigned int off, s3c_gpio_pull_t pull);
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/**
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* s3c_gpio_getpull_s3c2443() - Get configuration for s3c2443 pull resistors
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* @chip: The gpio chip that the GPIO pin belongs to.
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* @off: The offset to the pin to get the configuration of.
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*
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* This helper function reads the state of the pull-{up,down} resistor for the
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* given GPIO in the same case as s3c_gpio_setpull_upown.
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*/
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extern s3c_gpio_pull_t s3c_gpio_getpull_s3c24xx(struct s3c_gpio_chip *chip,
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unsigned int off);
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#endif /* __PLAT_GPIO_CFG_HELPERS_H */
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