osd-contiki/platform/galileo/drivers/galileo-gpio.c
Michael LeMay 4181179985 galileo: Add support for Gen. 1 pinmux and GPIO
This patch adds support for IO pinmuxing and GPIO on first generation
Intel Galileo boards.
2016-08-23 13:02:39 -07:00

103 lines
3.3 KiB
C

/*
* Copyright (C) 2016, Intel Corporation. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "galileo-gpio.h"
#include <assert.h>
#include "gpio.h"
#if GALILEO_GEN == 1
#include "cy8c9540a.h"
#endif
/* Must be implemented in board-specific pinmux file to map a board-level GPIO
* pin number to the corresponding CPU GPIO pin number.
*
* For gen. 1 boards, the value -1 may be returned to indicate that the
* specified GPIO pin is not connected to any CPU pin. For gen. 2 boards, the
* return value should always be a positive number. An assertion within the
* function should check the validity of the pin number.
*/
int galileo_brd_to_cpu_gpio_pin(unsigned pin, bool *sus);
#if GALILEO_GEN == 1
cy8c9540a_bit_addr_t galileo_brd_to_cy8c9540a_gpio_pin(unsigned pin);
#endif
static int
brd_to_cpu_pin(unsigned pin)
{
int cpu_pin;
bool sus;
cpu_pin = galileo_brd_to_cpu_gpio_pin(pin, &sus);
assert(!sus);
return cpu_pin;
}
void galileo_gpio_config(uint8_t pin, int flags)
{
assert(quarkX1000_gpio_config(brd_to_cpu_pin(pin), flags) == 0);
}
/**
* \brief Read from GPIO.
* \param pin Board-level IO pin number.
*/
void galileo_gpio_read(uint8_t pin, uint8_t *value)
{
#if GALILEO_GEN == 1
cy8c9540a_bit_addr_t bit_addr;
#endif
int cpu_pin = brd_to_cpu_pin(pin);
#if GALILEO_GEN == 1
if(cpu_pin == -1) {
bit_addr = galileo_brd_to_cy8c9540a_gpio_pin(pin);
*value = cy8c9540a_read(bit_addr);
return;
}
#endif
assert(quarkX1000_gpio_read(cpu_pin, value) == 0);
}
void galileo_gpio_write(uint8_t pin, uint8_t value)
{
#if GALILEO_GEN == 1
cy8c9540a_bit_addr_t bit_addr;
#endif
int cpu_pin = brd_to_cpu_pin(pin);
#if GALILEO_GEN == 1
if(cpu_pin == -1) {
bit_addr = galileo_brd_to_cy8c9540a_gpio_pin(pin);
cy8c9540a_write(bit_addr, value);
return;
}
#endif
assert(quarkX1000_gpio_write(cpu_pin, value) == 0);
}