gpio.c

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/* SPDX-License-Identifier: BSD-3-Clause */
 
#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 functionality
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 functionality 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);
}