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>
Reviewed-by: Stefano Babic <sbabic@denx.de>
Reviewed-by: Łukasz Majewski <lukma@denx.de>
diff --git a/common/spl/Kconfig b/common/spl/Kconfig
index 582b685..9446cd9 100644
--- a/common/spl/Kconfig
+++ b/common/spl/Kconfig
@@ -668,6 +668,12 @@
endchoice
+config SPL_USB_SDP_SUPPORT
+ bool "Support SDP (Serial Download Protocol)"
+ help
+ Enable Serial Download Protocol (SDP) device support in SPL. This
+ allows to download images into memory and execute (jump to) them
+ using the same protocol as implemented by the i.MX family's boot ROM.
endif
config SPL_WATCHDOG_SUPPORT
diff --git a/common/spl/Makefile b/common/spl/Makefile
index fde0d09..e229947 100644
--- a/common/spl/Makefile
+++ b/common/spl/Makefile
@@ -30,4 +30,5 @@
obj-$(CONFIG_$(SPL_TPL_)DFU_SUPPORT) += spl_dfu.o
obj-$(CONFIG_$(SPL_TPL_)SPI_LOAD) += spl_spi.o
obj-$(CONFIG_$(SPL_TPL_)RAM_SUPPORT) += spl_ram.o
+obj-$(CONFIG_$(SPL_TPL_)USB_SDP_SUPPORT) += spl_sdp.o
endif
diff --git a/common/spl/spl_sdp.c b/common/spl/spl_sdp.c
new file mode 100644
index 0000000..350bcdb
--- /dev/null
+++ b/common/spl/spl_sdp.c
@@ -0,0 +1,37 @@
+/*
+ * (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;
+ const int controller_index = 0;
+
+ g_dnl_clear_detach();
+ g_dnl_register("usb_dnl_sdp");
+
+ ret = sdp_init(controller_index);
+ if (ret) {
+ error("SDP init failed: %d", ret);
+ return -ENODEV;
+ }
+
+ /* This command typically does not return but jumps to an image */
+ sdp_handle(controller_index);
+ error("SDP ended");
+
+ return -EINVAL;
+}
+SPL_LOAD_IMAGE_METHOD("USB SDP", 0, BOOT_DEVICE_BOARD, spl_sdp_load_image);