| /* |
| * 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__ */ |