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/*
* Copyright (c) 2011-2012, The Linux Foundation. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of The Linux Foundation 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 "AS IS" AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER 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 <device/mmio.h>
#include <gpio.h>
#include <soc/iomap.h>
/*******************************************************
Function description: check for invalid GPIO #
Arguments :
gpio_t gpio - Gpio number
Return : GPIO Valid(0)/Invalid(1)
*******************************************************/
static inline int gpio_not_valid(gpio_t gpio)
{
return (gpio > GPIO_MAX_NUM);
}
/*******************************************************
Function description: configure GPIO functinality
Arguments :
gpio_t gpio - Gpio number
unsigned func - Functionality number
unsigned pull - pull up/down, no pull range(0-3)
unsigned drvstr - range (0 - 7)-> (2- 16)MA steps of 2
unsigned enable - 0 Disable, 1 - Enable.
Return : None
*******************************************************/
void gpio_tlmm_config_set(gpio_t gpio, unsigned int func,
unsigned int pull, unsigned int drvstr,
unsigned int enable)
{
unsigned int val = 0;
if (gpio_not_valid(gpio))
return;
val |= (pull & GPIO_CFG_PULL_MASK) << GPIO_CFG_PULL_SHIFT;
val |= (func & GPIO_CFG_FUNC_MASK) << GPIO_CFG_FUNC_SHIFT;
val |= (drvstr & GPIO_CFG_DRV_MASK) << GPIO_CFG_DRV_SHIFT;
val |= (enable & GPIO_CFG_OE_MASK) << GPIO_CFG_OE_SHIFT;
write32(GPIO_CONFIG_ADDR(gpio), val);
}
/*******************************************************
Function description: Get GPIO configuration
Arguments :
gpio_t gpio - Gpio number
unsigned *func - Functionality number
unsigned *pull - pull up/down, no pull range(0-3)
unsigned *drvstr - range (0 - 7)-> (2- 16)MA steps of 2
unsigned *enable - 0 - Disable, 1- Enable.
Return : None
*******************************************************/
void gpio_tlmm_config_get(gpio_t gpio, unsigned int *func,
unsigned int *pull, unsigned int *drvstr,
unsigned int *enable)
{
unsigned int val;
void *addr = GPIO_CONFIG_ADDR(gpio);
if (gpio_not_valid(gpio))
return;
val = read32(addr);
*pull = (val >> GPIO_CFG_PULL_SHIFT) & GPIO_CFG_PULL_MASK;
*func = (val >> GPIO_CFG_FUNC_SHIFT) & GPIO_CFG_FUNC_MASK;
*drvstr = (val >> GPIO_CFG_DRV_SHIFT) & GPIO_CFG_DRV_MASK;
*enable = (val >> GPIO_CFG_OE_SHIFT) & GPIO_CFG_OE_MASK;
}
/*******************************************************
Function description: get GPIO IO functinality details
Arguments :
gpio_t gpio - Gpio number
unsigned *in - Value of GPIO input
unsigned *out - Value of GPIO output
Return : None
*******************************************************/
int gpio_get(gpio_t gpio)
{
if (gpio_not_valid(gpio))
return -1;
return (read32(GPIO_IN_OUT_ADDR(gpio)) >> GPIO_IO_IN_SHIFT) &
GPIO_IO_IN_MASK;
}
void gpio_set(gpio_t gpio, int value)
{
if (gpio_not_valid(gpio))
return;
write32(GPIO_IN_OUT_ADDR(gpio), (value & 1) << GPIO_IO_OUT_SHIFT);
}
void gpio_input_pulldown(gpio_t gpio)
{
gpio_tlmm_config_set(gpio, GPIO_FUNC_DISABLE,
GPIO_PULL_DOWN, GPIO_2MA, GPIO_DISABLE);
}
void gpio_input_pullup(gpio_t gpio)
{
gpio_tlmm_config_set(gpio, GPIO_FUNC_DISABLE,
GPIO_PULL_UP, GPIO_2MA, GPIO_DISABLE);
}
void gpio_input(gpio_t gpio)
{
gpio_tlmm_config_set(gpio, GPIO_FUNC_DISABLE,
GPIO_NO_PULL, GPIO_2MA, GPIO_DISABLE);
}
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