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