// 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 usb 0"); break; case BOOT_UMS: debug("%s: enter UMS!\n", __func__); env_set("preboot", "setenv preboot; ums mmc 0"); break; } return 0; } #endif