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 <command.h>
9 #include <env.h>
10 #include <log.h>
11 #include <asm/io.h>
12 #include <asm/arch-rockchip/boot_mode.h>
13 #include <dm/device.h>
14 #include <dm/uclass.h>
15
16 #if (CONFIG_ROCKCHIP_BOOT_MODE_REG == 0)
17
setup_boot_mode(void)18 int setup_boot_mode(void)
19 {
20 return 0;
21 }
22
23 #else
24
set_back_to_bootrom_dnl_flag(void)25 void set_back_to_bootrom_dnl_flag(void)
26 {
27 writel(BOOT_BROM_DOWNLOAD, CONFIG_ROCKCHIP_BOOT_MODE_REG);
28 }
29
30 /*
31 * detect download key status by adc, most rockchip
32 * based boards use adc sample the download key status,
33 * but there are also some use gpio. So it's better to
34 * make this a weak function that can be override by
35 * some special boards.
36 */
37 #define KEY_DOWN_MIN_VAL 0
38 #define KEY_DOWN_MAX_VAL 30
39
rockchip_dnl_key_pressed(void)40 __weak int rockchip_dnl_key_pressed(void)
41 {
42 unsigned int val;
43 struct udevice *dev;
44 struct uclass *uc;
45 int ret;
46
47 ret = uclass_get(UCLASS_ADC, &uc);
48 if (ret)
49 return false;
50
51 ret = -ENODEV;
52 uclass_foreach_dev(dev, uc) {
53 if (!strncmp(dev->name, "saradc", 6)) {
54 ret = adc_channel_single_shot(dev->name, 1, &val);
55 break;
56 }
57 }
58
59 if (ret == -ENODEV) {
60 pr_warn("%s: no saradc device found\n", __func__);
61 return false;
62 } else if (ret) {
63 pr_err("%s: adc_channel_single_shot fail!\n", __func__);
64 return false;
65 }
66
67 if ((val >= KEY_DOWN_MIN_VAL) && (val <= KEY_DOWN_MAX_VAL))
68 return true;
69 else
70 return false;
71 }
72
rockchip_dnl_mode_check(void)73 void rockchip_dnl_mode_check(void)
74 {
75 if (rockchip_dnl_key_pressed()) {
76 printf("download key pressed, entering download mode...");
77 set_back_to_bootrom_dnl_flag();
78 do_reset(NULL, 0, 0, NULL);
79 }
80 }
81
setup_boot_mode(void)82 int setup_boot_mode(void)
83 {
84 void *reg = (void *)CONFIG_ROCKCHIP_BOOT_MODE_REG;
85 int boot_mode = readl(reg);
86
87 rockchip_dnl_mode_check();
88
89 boot_mode = readl(reg);
90 debug("%s: boot mode 0x%08x\n", __func__, boot_mode);
91
92 /* Clear boot mode */
93 writel(BOOT_NORMAL, reg);
94
95 switch (boot_mode) {
96 case BOOT_FASTBOOT:
97 debug("%s: enter fastboot!\n", __func__);
98 env_set("preboot", "setenv preboot; fastboot usb0");
99 break;
100 case BOOT_UMS:
101 debug("%s: enter UMS!\n", __func__);
102 env_set("preboot", "setenv preboot; ums mmc 0");
103 break;
104 }
105
106 return 0;
107 }
108
109 #endif
110