boot_mode.c
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/*
* (C) Copyright 2016 Rockchip Electronics Co., Ltd
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <adc.h>
#include <asm/io.h>
#include <asm/arch/boot_mode.h>
#if (CONFIG_ROCKCHIP_BOOT_MODE_REG == 0)
int setup_boot_mode(void)
{
return 0;
}
#else
void set_back_to_bootrom_dnl_flag(void)
{
writel(BOOT_BROM_DOWNLOAD, CONFIG_ROCKCHIP_BOOT_MODE_REG);
}
/*
* detect download key status by adc, most rockchip
* based boards use adc sample the download key status,
* but there are also some use gpio. So it's better to
* make this a weak function that can be override by
* some special boards.
*/
#define KEY_DOWN_MIN_VAL 0
#define KEY_DOWN_MAX_VAL 30
__weak int rockchip_dnl_key_pressed(void)
{
unsigned int val;
if (adc_channel_single_shot("saradc", 1, &val)) {
pr_err("%s: adc_channel_single_shot fail!\n", __func__);
return false;
}
if ((val >= KEY_DOWN_MIN_VAL) && (val <= KEY_DOWN_MAX_VAL))
return true;
else
return false;
}
void rockchip_dnl_mode_check(void)
{
if (rockchip_dnl_key_pressed()) {
printf("download key pressed, entering download mode...");
set_back_to_bootrom_dnl_flag();
do_reset(NULL, 0, 0, NULL);
}
}
int setup_boot_mode(void)
{
void *reg = (void *)CONFIG_ROCKCHIP_BOOT_MODE_REG;
int boot_mode = readl(reg);
rockchip_dnl_mode_check();
boot_mode = readl(reg);
debug("%s: boot mode 0x%08x\n", __func__, boot_mode);
/* Clear boot mode */
writel(BOOT_NORMAL, reg);
switch (boot_mode) {
case BOOT_FASTBOOT:
debug("%s: enter fastboot!\n", __func__);
env_set("preboot", "setenv preboot; fastboot usb0");
break;
case BOOT_UMS:
debug("%s: enter UMS!\n", __func__);
env_set("preboot", "setenv preboot; ums mmc 0");
break;
}
return 0;
}
#endif