ayufan: introduce recovery button mode selection

Press and hold recovery button to choose suitable boot mode.
When given mode is selected release the button.
Each mode exposes device over USB-OTG and can be connected via USB A-to-A cable

1 blink: share eMMC or SD as virtual disk
2 blinks: enter fastboot (Android's)
3 blinks: enter RockUSB download mode
4 blinks: enter MaskROM download mode

Change-Id: I0ce9e67b51d7959ff2877418c2c9dfd4382de2a4

arch/arm/dts/rk3328-rock64.dts

@@ -59,6 +59,11 @@
 		regulator-min-microvolt = <5000000>;
 		regulator-max-microvolt = <5000000>;
 	};
+
+	adc-keys {
+		compatible = "adc-keys";
+		io-channels = <&saradc 0>;
+	};
 };
 
 &saradc {
@@ -154,11 +159,11 @@
 		};
 
 		led1 {
-			label = "standby_led";
+			label = "standby";
 		};
 
 		led2 {
-			label = "power_led";
+			label = "power";
 		};
 
 		regulators {

arch/arm/mach-rockchip/boot_mode.c

@@ -54,15 +54,72 @@ __weak int rockchip_dnl_key_pressed(void)
 		return false;
 }
 
+int rockchip_dnl_mode(int num_modes)
+{
+	int mode = 0;
+
+	while(mode < num_modes) {
+		++mode;
+
+		printf("rockchip_dnl_mode = %d mode\n", mode);
+
+		for (int i = 0; i < mode; ++i) {
+			cli_simple_run_command("led power off", 0);
+			mdelay(100);
+			cli_simple_run_command("led power on", 0);
+			mdelay(100);
+		}
+
+		// wait 2 seconds
+		for (int i = 0; i < 100; ++i) {
+			if (!rockchip_dnl_key_pressed()) {
+				goto end;
+			}
+			mdelay(20);
+		}
+	}
+
+end:
+	cli_simple_run_command("led power off", 0);
+	cli_simple_run_command("led standby on", 0);
+	return mode;
+}
+
 void rockchip_dnl_mode_check(void)
 {
-	if (rockchip_dnl_key_pressed()) {
-		printf("download key pressed, entering download mode...\n");
-		/* If failed, we fall back to bootrom download mode */
+	if (!rockchip_dnl_key_pressed()) {
+		return 0;
+	}
+
+	switch(rockchip_dnl_mode(4)) {
+	case 0:
+		return;
+
+	case 1:
+		printf("entering ums mode...\n");
+		cli_simple_run_command("ums 0 mmc 0", 0);
+		cli_simple_run_command("ums 0 mmc 1", 0);
+		break;
+
+	case 2:
+		printf("entering fastboot mode...\n");
+		cli_simple_run_command("mmc dev 0; fastboot usb 0", 0);
+		cli_simple_run_command("mmc dev 1; fastboot usb 0", 0);
+		break;
+
+	case 3:
+		printf("entering download mode...\n");
 		cli_simple_run_command("rockusb 0 mmc 0", 0);
-		set_back_to_bootrom_dnl_flag();
-		do_reset(NULL, 0, 0, NULL);
+		cli_simple_run_command("rockusb 0 mmc 1", 0);
+		break;
+
+	case 4:
+		printf("entering maskrom mode...\n");
+		break;
 	}
+
+	set_back_to_bootrom_dnl_flag();
+	do_reset(NULL, 0, 0, NULL);
 }
 
 int setup_boot_mode(void)

configs/rock64-rk3328_defconfig

@@ -70,6 +70,7 @@ CONFIG_SPL_CLK=y
 CONFIG_TPL_CLK=y
 CONFIG_ROCKCHIP_GPIO=y
 CONFIG_SYS_I2C_ROCKCHIP=y
+CONFIG_DM_KEY=y
 CONFIG_LED=y
 CONFIG_MISC=y
 CONFIG_ROCKCHIP_EFUSE=y