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83d290c5 | 1 | // SPDX-License-Identifier: GPL-2.0+ |
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2 | /* |
3 | * (C) Copyright 2016 Rockchip Electronics Co., Ltd | |
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4 | */ |
5 | ||
6 | #include <common.h> | |
ecb103bf | 7 | #include <adc.h> |
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8 | #include <asm/io.h> |
9 | #include <asm/arch/boot_mode.h> | |
10 | ||
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11 | #if (CONFIG_ROCKCHIP_BOOT_MODE_REG == 0) |
12 | ||
13 | int setup_boot_mode(void) | |
14 | { | |
15 | return 0; | |
16 | } | |
17 | ||
18 | #else | |
19 | ||
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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 | ||
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59 | int setup_boot_mode(void) |
60 | { | |
61 | void *reg = (void *)CONFIG_ROCKCHIP_BOOT_MODE_REG; | |
62 | int boot_mode = readl(reg); | |
63 | ||
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64 | rockchip_dnl_mode_check(); |
65 | ||
66 | boot_mode = readl(reg); | |
67 | debug("%s: boot mode 0x%08x\n", __func__, boot_mode); | |
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68 | |
69 | /* Clear boot mode */ | |
70 | writel(BOOT_NORMAL, reg); | |
71 | ||
72 | switch (boot_mode) { | |
73 | case BOOT_FASTBOOT: | |
ecb103bf | 74 | debug("%s: enter fastboot!\n", __func__); |
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75 | env_set("preboot", "setenv preboot; fastboot usb0"); |
76 | break; | |
77 | case BOOT_UMS: | |
ecb103bf | 78 | debug("%s: enter UMS!\n", __func__); |
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79 | env_set("preboot", "setenv preboot; ums mmc 0"); |
80 | break; | |
81 | } | |
82 | ||
83 | return 0; | |
84 | } | |
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85 | |
86 | #endif |