48 lines
1.7 KiB
C
48 lines
1.7 KiB
C
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/*
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* This file is part of the coreboot project.
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*
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* Copyright 2014 Google Inc.
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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 as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef __SRC_INCLUDE_GPIOLIB_H__
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#define __SRC_INCLUDE_GPIOLIB_H__
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/* A generic type, use accessor macros to actually access the hardware. */
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typedef unsigned gpio_t;
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/*
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* Read the value presented by the set of GPIOs, when each pin is interpreted
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* as a number in 0..2 range depending on the external pullup situation.
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*
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* Depending on the third parameter, the return value is either a set of two
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* bit fields, each representing one GPIO value, or a number where each GPIO is
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* included multiplied by 3^gpio_num, resulting in a true tertiary value.
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*
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*/
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int gpio_board_id(gpio_t gpio[], int num_gpio, int tertiary);
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/*
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* The following functions are not provided by the common library, but must be
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* implemented by the appropriate SOC/board instead.
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*/
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int gpio_get_in_value(gpio_t gpio);
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void gpio_set_out_value(gpio_t gpio, int value);
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void gpio_input_pulldown(gpio_t gpio);
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void gpio_input_pullup(gpio_t gpio);
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void gpio_input(gpio_t gpio);
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#endif
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