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/*
* Copyright (c) 2011-2012, Code Aurora Forum. 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 Google, Inc. 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 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 <iomap.h>
#include <gpio.h>
#include <arch/io.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 func,
unsigned pull, unsigned drvstr,
unsigned enable)
{
unsigned 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;
writel(val, GPIO_CONFIG_ADDR(gpio));
}
/*******************************************************
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 *func,
unsigned *pull, unsigned *drvstr,
unsigned *enable)
{
unsigned val;
void *addr = GPIO_CONFIG_ADDR(gpio);
if (gpio_not_valid(gpio))
return;
val = readl(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_in_value(gpio_t gpio)
{
if (gpio_not_valid(gpio))
return -1;
return (readl(GPIO_IN_OUT_ADDR(gpio)) >> GPIO_IO_IN_SHIFT) &
GPIO_IO_IN_MASK;
}
void gpio_set_out_value(gpio_t gpio, int value)
{
if (gpio_not_valid(gpio))
return;
writel((value & 1) << GPIO_IO_OUT_SHIFT, GPIO_IN_OUT_ADDR(gpio));
}
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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