mxc_gpio.c
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/*
* Copyright (C) 2009
* Guennadi Liakhovetski, DENX Software Engineering, <lg@denx.de>
*
* Copyright (C) 2011
* Stefano Babic, DENX Software Engineering, <sbabic@denx.de>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/arch/imx-regs.h>
#include <asm/gpio.h>
#include <asm/io.h>
#include <errno.h>
enum mxc_gpio_direction {
MXC_GPIO_DIRECTION_IN,
MXC_GPIO_DIRECTION_OUT,
};
#define GPIO_TO_PORT(n) (n / 32)
/* GPIO port description */
static unsigned long gpio_ports[] = {
[0] = GPIO1_BASE_ADDR,
[1] = GPIO2_BASE_ADDR,
[2] = GPIO3_BASE_ADDR,
#if defined(CONFIG_MX25) || defined(CONFIG_MX27) || defined(CONFIG_MX51) || \
defined(CONFIG_MX53) || defined(CONFIG_MX6)
[3] = GPIO4_BASE_ADDR,
#endif
#if defined(CONFIG_MX27) || defined(CONFIG_MX53) || defined(CONFIG_MX6)
[4] = GPIO5_BASE_ADDR,
[5] = GPIO6_BASE_ADDR,
#endif
#if defined(CONFIG_MX53) || defined(CONFIG_MX6)
[6] = GPIO7_BASE_ADDR,
#endif
};
static int mxc_gpio_direction(unsigned int gpio,
enum mxc_gpio_direction direction)
{
unsigned int port = GPIO_TO_PORT(gpio);
struct gpio_regs *regs;
u32 l;
if (port >= ARRAY_SIZE(gpio_ports))
return -1;
gpio &= 0x1f;
regs = (struct gpio_regs *)gpio_ports[port];
l = readl(®s->gpio_dir);
switch (direction) {
case MXC_GPIO_DIRECTION_OUT:
l |= 1 << gpio;
break;
case MXC_GPIO_DIRECTION_IN:
l &= ~(1 << gpio);
}
writel(l, ®s->gpio_dir);
return 0;
}
int gpio_set_value(unsigned gpio, int value)
{
unsigned int port = GPIO_TO_PORT(gpio);
struct gpio_regs *regs;
u32 l;
if (port >= ARRAY_SIZE(gpio_ports))
return -1;
gpio &= 0x1f;
regs = (struct gpio_regs *)gpio_ports[port];
l = readl(®s->gpio_dr);
if (value)
l |= 1 << gpio;
else
l &= ~(1 << gpio);
writel(l, ®s->gpio_dr);
return 0;
}
int gpio_get_value(unsigned gpio)
{
unsigned int port = GPIO_TO_PORT(gpio);
struct gpio_regs *regs;
u32 val;
if (port >= ARRAY_SIZE(gpio_ports))
return -1;
gpio &= 0x1f;
regs = (struct gpio_regs *)gpio_ports[port];
val = (readl(®s->gpio_psr) >> gpio) & 0x01;
return val;
}
int gpio_request(unsigned gpio, const char *label)
{
unsigned int port = GPIO_TO_PORT(gpio);
if (port >= ARRAY_SIZE(gpio_ports))
return -1;
return 0;
}
int gpio_free(unsigned gpio)
{
return 0;
}
int gpio_direction_input(unsigned gpio)
{
return mxc_gpio_direction(gpio, MXC_GPIO_DIRECTION_IN);
}
int gpio_direction_output(unsigned gpio, int value)
{
int ret = gpio_set_value(gpio, value);
if (ret < 0)
return ret;
return mxc_gpio_direction(gpio, MXC_GPIO_DIRECTION_OUT);
}