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/* Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/* GPIO module for Chrome EC */
#include "gpio.h"
#include "registers.h"
int gpio_pre_init(void)
{
/* Enable clock to GPIO block A */
LM4_SYSTEM_RCGCGPIO |= 0x0001;
/* Turn off the LED before we make it an output */
gpio_set(EC_GPIO_DEBUG_LED, 0);
/* Clear GPIOAFSEL bits for block A pin 7 */
LM4_GPIO_AFSEL(A) &= ~(0x80);
/* Set GPIO to digital enable, output */
LM4_GPIO_DEN(A) |= 0x80;
LM4_GPIO_DIR(A) |= 0x80;
return EC_SUCCESS;
}
int gpio_init(void)
{
return EC_SUCCESS;
}
int gpio_get(enum gpio_signal signal, int *value_ptr)
{
switch (signal) {
case EC_GPIO_DEBUG_LED:
*value_ptr = (LM4_GPIO_DATA_BITS(A, 0x200) & 0x80 ? 1 : 0);
return EC_SUCCESS;
default:
return EC_ERROR_UNKNOWN;
}
}
int gpio_set(enum gpio_signal signal, int value)
{
switch (signal) {
case EC_GPIO_DEBUG_LED:
LM4_GPIO_DATA_BITS(A, 0x200) = (value ? 0x80 : 0);
return EC_SUCCESS;
default:
return EC_ERROR_UNKNOWN;
}
}
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