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
setup_boot_mode(void)13 int setup_boot_mode(void)
14 {
15 return 0;
16 }
17
18 #else
19
set_back_to_bootrom_dnl_flag(void)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
rockchip_dnl_key_pressed(void)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
rockchip_dnl_mode_check(void)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
setup_boot_mode(void)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