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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * (C) Copyright 2016 Rockchip Electronics Co., Ltd
- */
- #include <common.h>
- #include <adc.h>
- #include <command.h>
- #include <env.h>
- #include <log.h>
- #include <asm/io.h>
- #include <asm/arch-rockchip/boot_mode.h>
- #include <dm/device.h>
- #include <dm/uclass.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;
- struct udevice *dev;
- struct uclass *uc;
- int ret;
- ret = uclass_get(UCLASS_ADC, &uc);
- if (ret)
- return false;
- ret = -ENODEV;
- uclass_foreach_dev(dev, uc) {
- if (!strncmp(dev->name, "saradc", 6)) {
- ret = adc_channel_single_shot(dev->name, 1, &val);
- break;
- }
- }
- if (ret == -ENODEV) {
- pr_warn("%s: no saradc device found\n", __func__);
- return false;
- } else if (ret) {
- 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
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