upstream u-boot with additional patches for our devices/boards: https://lists.denx.de/pipermail/u-boot/2017-March/282789.html (AXP crashes) ; Gbit ethernet patch for some LIME2 revisions ; with SPI flash support
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u-boot/board/altera/nios2-generic/gpio.c

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/*
* board gpio driver
*
* Copyright (C) 2010 Thomas Chou <thomas@wytron.com.tw>
* Licensed under the GPL-2 or later.
*/
#include <common.h>
#include <asm/io.h>
#ifndef CONFIG_SYS_GPIO_BASE
#define ALTERA_PIO_BASE LED_PIO_BASE
#define ALTERA_PIO_WIDTH LED_PIO_WIDTH
#define ALTERA_PIO_DATA (ALTERA_PIO_BASE + 0)
#define ALTERA_PIO_DIR (ALTERA_PIO_BASE + 4)
static u32 pio_data_reg;
static u32 pio_dir_reg;
int gpio_request(unsigned gpio, const char *label)
{
return 0;
}
int gpio_free(unsigned gpio)
{
return 0;
}
int gpio_direction_input(unsigned gpio)
{
u32 mask = 1 << gpio;
writel(pio_dir_reg &= ~mask, ALTERA_PIO_DIR);
return 0;
}
int gpio_direction_output(unsigned gpio, int value)
{
u32 mask = 1 << gpio;
if (value)
pio_data_reg |= mask;
else
pio_data_reg &= ~mask;
writel(pio_data_reg, ALTERA_PIO_DATA);
writel(pio_dir_reg |= mask, ALTERA_PIO_DIR);
return 0;
}
int gpio_get_value(unsigned gpio)
{
u32 mask = 1 << gpio;
if (pio_dir_reg & mask)
return (pio_data_reg & mask) ? 1 : 0;
else
return (readl(ALTERA_PIO_DATA) & mask) ? 1 : 0;
}
void gpio_set_value(unsigned gpio, int value)
{
u32 mask = 1 << gpio;
if (value)
pio_data_reg |= mask;
else
pio_data_reg &= ~mask;
writel(pio_data_reg, ALTERA_PIO_DATA);
}
int gpio_is_valid(int number)
{
return ((unsigned)number) < ALTERA_PIO_WIDTH;
}
#endif