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 582b685dad36b9cea6298481d49ceb214e8a5926..9446cd9b42e45fb3be13f1c27a1dafbbac31cc4f 100644 (file)
--- a/common/spl/Kconfig
+++ b/common/spl/Kconfig
@@ -668,6 +668,12 @@ config SPL_DFU_RAM
 
 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 fde0d09a5a9b151090464294ec04534b32e058f5..e229947b53b535259c86631b805a5a7ece37245a 100644 (file)
--- a/common/spl/Makefile
+++ b/common/spl/Makefile
@@ -30,4 +30,5 @@ obj-$(CONFIG_$(SPL_TPL_)SATA_SUPPORT) += spl_sata.o
 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 (file)
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);

diff --git a/drivers/usb/gadget/Makefile b/drivers/usb/gadget/Makefile
index 6a007d1bcb648fe01319942717b59c843edde452..7258099c1cf5f930831a6cf7a4473804b98ff120 100644 (file)
--- a/drivers/usb/gadget/Makefile
+++ b/drivers/usb/gadget/Makefile
@@ -11,6 +11,7 @@ obj-$(CONFIG_USB_ETHER) += epautoconf.o config.o usbstring.o
 ifdef CONFIG_SPL_BUILD
 obj-$(CONFIG_SPL_USB_GADGET_SUPPORT) += g_dnl.o
 obj-$(CONFIG_SPL_DFU_SUPPORT) += f_dfu.o
+obj-$(CONFIG_SPL_USB_SDP_SUPPORT) += f_sdp.o
 endif
 
 # new USB gadget layer dependencies