mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-11 13:56:30 +00:00
150 lines
2.8 KiB
C
150 lines
2.8 KiB
C
/*
|
|
* arch/arm/plat-orion/gpio.c
|
|
*
|
|
* Marvell Orion SoC GPIO handling.
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
/*
|
|
* Based on (mostly copied from) plat-orion based Linux 2.6 kernel driver.
|
|
* Removed orion_gpiochip struct and kernel level irq handling.
|
|
*
|
|
* Dieter Kiermaier dk-arm-linux@gmx.de
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <asm/bitops.h>
|
|
#include <asm/io.h>
|
|
#include <asm/arch/soc.h>
|
|
#include <asm/arch/gpio.h>
|
|
|
|
static unsigned long gpio_valid_input[BITS_TO_LONGS(GPIO_MAX)];
|
|
static unsigned long gpio_valid_output[BITS_TO_LONGS(GPIO_MAX)];
|
|
|
|
void __set_direction(unsigned pin, int input)
|
|
{
|
|
u32 u;
|
|
|
|
u = readl(GPIO_IO_CONF(pin));
|
|
if (input)
|
|
u |= 1 << (pin & 31);
|
|
else
|
|
u &= ~(1 << (pin & 31));
|
|
writel(u, GPIO_IO_CONF(pin));
|
|
|
|
u = readl(GPIO_IO_CONF(pin));
|
|
}
|
|
|
|
static void __set_level(unsigned pin, int high)
|
|
{
|
|
u32 u;
|
|
|
|
u = readl(GPIO_OUT(pin));
|
|
if (high)
|
|
u |= 1 << (pin & 31);
|
|
else
|
|
u &= ~(1 << (pin & 31));
|
|
writel(u, GPIO_OUT(pin));
|
|
}
|
|
|
|
static void __set_blinking(unsigned pin, int blink)
|
|
{
|
|
u32 u;
|
|
|
|
u = readl(GPIO_BLINK_EN(pin));
|
|
if (blink)
|
|
u |= 1 << (pin & 31);
|
|
else
|
|
u &= ~(1 << (pin & 31));
|
|
writel(u, GPIO_BLINK_EN(pin));
|
|
}
|
|
|
|
int kw_gpio_is_valid(unsigned pin, int mode)
|
|
{
|
|
if (pin < GPIO_MAX) {
|
|
if ((mode & GPIO_INPUT_OK) && !test_bit(pin, gpio_valid_input))
|
|
goto err_out;
|
|
|
|
if ((mode & GPIO_OUTPUT_OK) && !test_bit(pin, gpio_valid_output))
|
|
goto err_out;
|
|
return 0;
|
|
}
|
|
|
|
err_out:
|
|
printf("%s: invalid GPIO %d\n", __func__, pin);
|
|
return 1;
|
|
}
|
|
|
|
void kw_gpio_set_valid(unsigned pin, int mode)
|
|
{
|
|
if (mode == 1)
|
|
mode = GPIO_INPUT_OK | GPIO_OUTPUT_OK;
|
|
if (mode & GPIO_INPUT_OK)
|
|
__set_bit(pin, gpio_valid_input);
|
|
else
|
|
__clear_bit(pin, gpio_valid_input);
|
|
if (mode & GPIO_OUTPUT_OK)
|
|
__set_bit(pin, gpio_valid_output);
|
|
else
|
|
__clear_bit(pin, gpio_valid_output);
|
|
}
|
|
/*
|
|
* GENERIC_GPIO primitives.
|
|
*/
|
|
int kw_gpio_direction_input(unsigned pin)
|
|
{
|
|
if (kw_gpio_is_valid(pin, GPIO_INPUT_OK) != 0)
|
|
return 1;
|
|
|
|
/* Configure GPIO direction. */
|
|
__set_direction(pin, 1);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int kw_gpio_direction_output(unsigned pin, int value)
|
|
{
|
|
if (kw_gpio_is_valid(pin, GPIO_OUTPUT_OK) != 0)
|
|
{
|
|
printf("%s: invalid GPIO %d\n", __func__, pin);
|
|
return 1;
|
|
}
|
|
|
|
__set_blinking(pin, 0);
|
|
|
|
/* Configure GPIO output value. */
|
|
__set_level(pin, value);
|
|
|
|
/* Configure GPIO direction. */
|
|
__set_direction(pin, 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int kw_gpio_get_value(unsigned pin)
|
|
{
|
|
int val;
|
|
|
|
if (readl(GPIO_IO_CONF(pin)) & (1 << (pin & 31)))
|
|
val = readl(GPIO_DATA_IN(pin)) ^ readl(GPIO_IN_POL(pin));
|
|
else
|
|
val = readl(GPIO_OUT(pin));
|
|
|
|
return (val >> (pin & 31)) & 1;
|
|
}
|
|
|
|
void kw_gpio_set_value(unsigned pin, int value)
|
|
{
|
|
/* Configure GPIO output value. */
|
|
__set_level(pin, value);
|
|
}
|
|
|
|
void kw_gpio_set_blink(unsigned pin, int blink)
|
|
{
|
|
/* Set output value to zero. */
|
|
__set_level(pin, 0);
|
|
|
|
/* Set blinking. */
|
|
__set_blinking(pin, blink);
|
|
}
|