/* * This file is part of the coreboot project. * * Copyright 2014 Google Inc. * * 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; version 2 of the License. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #ifndef __SRC_INCLUDE_GPIO_H__ #define __SRC_INCLUDE_GPIO_H__ #include <soc/gpio.h> #include <types.h> /* <soc/gpio.h> must typedef a gpio_t that fits in 32 bits. */ _Static_assert(sizeof(gpio_t) <= sizeof(u32), "gpio_t doesn't fit in lb_gpio"); /* The following functions must be implemented by SoC/board code. */ int gpio_get(gpio_t gpio); void gpio_set(gpio_t gpio, int value); void gpio_input_pulldown(gpio_t gpio); void gpio_input_pullup(gpio_t gpio); void gpio_input(gpio_t gpio); void gpio_output(gpio_t gpio, int value); /* * Read the value presented by the set of GPIOs, when each pin is interpreted * as a base-2 digit (LOW = 0, HIGH = 1). * * gpio[]: pin positions to read. gpio[0] is less significant than gpio[1]. * num_gpio: number of pins to read. */ int gpio_base2_value(gpio_t gpio[], int num_gpio); /* * Read the value presented by the set of GPIOs, when each pin is interpreted * as a base-3 digit (LOW = 0, HIGH = 1, Z/floating = 2). * Example: X1 = Z, X2 = 1 -> gpio_base3_value({GPIO(X1), GPIO(X2)}) = 5 * BASE3() from <base3.h> can generate numbers to compare the result to. * * gpio[]: pin positions to read. gpio[0] is less significant than gpio[1]. * num_gpio: number of pins to read. */ int gpio_base3_value(gpio_t gpio[], int num_gpio); #endif /* __SRC_INCLUDE_GPIO_H__ */