spl: add serial download protocol (SDP) support

Add USB serial download protocol support to SPL. If the SoC started
in recovery mode the SPL will immediately switch to SDP and wait for
further downloads/commands from the host side.

Signed-off-by: Stefan Agner <stefan.agner@toradex.com>
Acked-by: Max Krummenacher <max.krummenacher@toradex.com>

1 files changed, 38 insertions, 0 deletions

diff --git a/common/spl/spl_sdp.c b/common/spl/spl_sdp.c
new file mode 100644
index 0000000000..6252a452a8
--- /dev/null
+++ b/common/spl/spl_sdp.c
@@ -0,0 +1,38 @@
+/*
+ * (C) Copyright 2016 Toradex
+ * Author: Stefan Agner <stefan.agner@toradex.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <spl.h>
+#include <usb.h>
+#include <g_dnl.h>
+#include <sdp.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static int spl_sdp_load_image(struct spl_image_info *spl_image,
+			      struct spl_boot_device *bootdev)
+{
+	int ret;
+
+	g_dnl_clear_detach();
+	g_dnl_register("usb_dnl_sdp");
+
+	ret = sdp_init();
+	if (ret) {
+		error("SDP init failed: %d", ret);
+		return -ENODEV;
+	}
+
+	ret = sdp_handle();
+	if (ret) {
+		error("SDP failed: %d", ret);
+		return -ENODEV;
+	}
+
+	return 0;
+}
+SPL_LOAD_IMAGE_METHOD(0, BOOT_DEVICE_SDP, spl_sdp_load_image);