1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * (C) Copyright 2016 Rockchip Electronics Co., Ltd 4 */ 5 6 #include <common.h> 7 #include <adc.h> 8 #include <asm/io.h> 9 #include <asm/arch/boot_mode.h> 10 11 #if (CONFIG_ROCKCHIP_BOOT_MODE_REG == 0) 12 13 int setup_boot_mode(void) 14 { 15 return 0; 16 } 17 18 #else 19 20 void set_back_to_bootrom_dnl_flag(void) 21 { 22 writel(BOOT_BROM_DOWNLOAD, CONFIG_ROCKCHIP_BOOT_MODE_REG); 23 } 24 25 /* 26 * detect download key status by adc, most rockchip 27 * based boards use adc sample the download key status, 28 * but there are also some use gpio. So it's better to 29 * make this a weak function that can be override by 30 * some special boards. 31 */ 32 #define KEY_DOWN_MIN_VAL 0 33 #define KEY_DOWN_MAX_VAL 30 34 35 __weak int rockchip_dnl_key_pressed(void) 36 { 37 unsigned int val; 38 39 if (adc_channel_single_shot("saradc", 1, &val)) { 40 pr_err("%s: adc_channel_single_shot fail!\n", __func__); 41 return false; 42 } 43 44 if ((val >= KEY_DOWN_MIN_VAL) && (val <= KEY_DOWN_MAX_VAL)) 45 return true; 46 else 47 return false; 48 } 49 50 void rockchip_dnl_mode_check(void) 51 { 52 if (rockchip_dnl_key_pressed()) { 53 printf("download key pressed, entering download mode..."); 54 set_back_to_bootrom_dnl_flag(); 55 do_reset(NULL, 0, 0, NULL); 56 } 57 } 58 59 int setup_boot_mode(void) 60 { 61 void *reg = (void *)CONFIG_ROCKCHIP_BOOT_MODE_REG; 62 int boot_mode = readl(reg); 63 64 rockchip_dnl_mode_check(); 65 66 boot_mode = readl(reg); 67 debug("%s: boot mode 0x%08x\n", __func__, boot_mode); 68 69 /* Clear boot mode */ 70 writel(BOOT_NORMAL, reg); 71 72 switch (boot_mode) { 73 case BOOT_FASTBOOT: 74 debug("%s: enter fastboot!\n", __func__); 75 env_set("preboot", "setenv preboot; fastboot usb0"); 76 break; 77 case BOOT_UMS: 78 debug("%s: enter UMS!\n", __func__); 79 env_set("preboot", "setenv preboot; ums mmc 0"); 80 break; 81 } 82 83 return 0; 84 } 85 86 #endif 87
