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/common/epled.c

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/*
* (C) Copyright 2004, Psyent Corporation <www.psyent.com>
* Scott McNutt <smcnutt@psyent.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/io.h>
#include <nios2-io.h>
#include <status_led.h>
/* The LED port is configured as output only, so we
* must track the state manually.
*/
static led_id_t val = 0;
void __led_init (led_id_t mask, int state)
{
nios_pio_t *pio = (nios_pio_t *)CONFIG_SYS_LEDPIO_ADDR;
if (state == STATUS_LED_ON)
val &= ~mask;
else
val |= mask;
writel (val, &pio->data);
}
void __led_set (led_id_t mask, int state)
{
nios_pio_t *pio = (nios_pio_t *)CONFIG_SYS_LEDPIO_ADDR;
if (state == STATUS_LED_ON)
val &= ~mask;
else
val |= mask;
writel (val, &pio->data);
}
void __led_toggle (led_id_t mask)
{
nios_pio_t *pio = (nios_pio_t *)CONFIG_SYS_LEDPIO_ADDR;
val ^= mask;
writel (val, &pio->data);
}