usb: gadget: f_sdp: Allow SPL to load and boot FIT via SDP

Add support for loading u-boot FIT images over the USB SDP protocol in
the SPL

Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.de>
[Various build fixes]
Signed-off-by: Sjoerd Simons <sjoerd.simons@collabora.co.uk>
Tested-by: Fabio Estevam <festevam@gmail.com>
Tested-by: Lukasz Majewski <lukma@denx.de>

common/spl/spl_sdp.c

@@ -25,10 +25,14 @@ static int spl_sdp_load_image(struct spl_image_info *spl_image,
 		return -ENODEV;
 	}
 
-	/* This command typically does not return but jumps to an image */
+	/*
-	sdp_handle(controller_index);
+	 * This command either loads a legacy image, jumps and never returns,
-	pr_err("SDP ended\n");
+	 * or it loads a FIT image and returns it to be handled by the SPL
+	 * code.
+	 */
+	ret = spl_sdp_handle(controller_index, spl_image);
+	debug("SDP ended\n");
 
-	return -EINVAL;
+	return ret;
 }
 SPL_LOAD_IMAGE_METHOD("USB SDP", 0, BOOT_DEVICE_BOARD, spl_sdp_load_image);

drivers/usb/gadget/f_sdp.c

@@ -638,7 +638,20 @@ static u32 sdp_jump_imxheader(void *address)
 	return 0;
 }
 
-static void sdp_handle_in_ep(void)
+#ifdef CONFIG_SPL_BUILD
+#ifdef CONFIG_SPL_LOAD_FIT
+static ulong sdp_fit_read(struct spl_load_info *load, ulong sector,
+			  ulong count, void *buf)
+{
+	debug("%s: sector %lx, count %lx, buf %lx\n",
+	      __func__, sector, count, (ulong)buf);
+	memcpy(buf, (void *)(load->dev + sector), count);
+	return count;
+}
+#endif
+#endif
+
+static void sdp_handle_in_ep(struct spl_image_info *spl_image)
 {
 	u8 *data = sdp_func->in_req->buf;
 	u32 status;
@@ -690,10 +703,25 @@ static void sdp_handle_in_ep(void)
 		/* If imx header fails, try some U-Boot specific headers */
 		if (status) {
 #ifdef CONFIG_SPL_BUILD
+			image_header_t *header =
+				sdp_ptr(sdp_func->jmp_address);
+#ifdef CONFIG_SPL_LOAD_FIT
+			if (image_get_magic(header) == FDT_MAGIC) {
+				struct spl_load_info load;
+
+				debug("Found FIT\n");
+				load.dev = header;
+				load.bl_len = 1;
+				load.read = sdp_fit_read;
+				spl_load_simple_fit(spl_image, &load, 0,
+						    header);
+
+				return;
+			}
+#endif
 			/* In SPL, allow jumps to U-Boot images */
 			struct spl_image_info spl_image = {};
-			spl_parse_image_header(&spl_image,
+			spl_parse_image_header(&spl_image, header);
-				(struct image_header *)sdp_func->jmp_address);
 			jump_to_image_no_args(&spl_image);
 #else
 			/* In U-Boot, allow jumps to scripts */
@@ -715,19 +743,32 @@ static void sdp_handle_in_ep(void)
 	};
 }
 
-void sdp_handle(int controller_index)
+#ifndef CONFIG_SPL_BUILD
+int sdp_handle(int controller_index)
+#else
+int spl_sdp_handle(int controller_index, struct spl_image_info *spl_image)
+#endif
 {
 	printf("SDP: handle requests...\n");
 	while (1) {
 		if (ctrlc()) {
 			puts("\rCTRL+C - Operation aborted.\n");
-			return;
+			return -EINVAL;
 		}
 
+#ifdef CONFIG_SPL_BUILD
+		if (spl_image->flags & SPL_FIT_FOUND)
+			return 0;
+#endif
+
 		WATCHDOG_RESET();
 		usb_gadget_handle_interrupts(controller_index);
 
-		sdp_handle_in_ep();
+#ifdef CONFIG_SPL_BUILD
+		sdp_handle_in_ep(spl_image);
+#else
+		sdp_handle_in_ep(NULL);
+#endif
 	}
 }
 

include/sdp.h

@@ -10,6 +10,13 @@
 #define __SDP_H_
 
 int sdp_init(int controller_index);
-void sdp_handle(int controller_index);
+
+#ifdef CONFIG_SPL_BUILD
+#include <spl.h>
+
+int spl_sdp_handle(int controller_index, struct spl_image_info *spl_image);
+#else
+int sdp_handle(int controller_index);
+#endif
 
 #endif /* __SDP_H_ */