[U-Boot] [RFC PATCH 03/11] SPL: FIT: factor out spl_load_fit_image()

[Andre Przywara]

At the moment we load two images from a FIT image: the actual U-Boot
image and the DTB. Both times we have very similar code to deal with
alignment requirement the media we load from imposes upon us.
Factor out this code into a new function, which we just call twice.

Signed-off-by: Andre Przywara <andre.przywara at arm.com>
---
 common/spl/spl_fit.c | 122 +++++++++++++++++++++------------------------------
 1 file changed, 51 insertions(+), 71 deletions(-)

diff --git a/common/spl/spl_fit.c b/common/spl/spl_fit.c
index 381ed1f..d4149c5 100644
--- a/common/spl/spl_fit.c
+++ b/common/spl/spl_fit.c
@@ -138,19 +138,58 @@ static int get_aligned_image_size(struct spl_load_info *info, int data_size,
 	return (data_size + info->bl_len - 1) / info->bl_len;
 }
 
+static int spl_load_fit_image(struct spl_load_info *info, ulong sector,
+			      void *fit, ulong base_offset, int node,
+			      struct spl_image_info *image_info)
+{
+	ulong offset;
+	size_t length;
+	ulong load, entry;
+	void *src;
+	ulong overhead;
+	int nr_sectors;
+
+	offset = fdt_getprop_u32(fit, node, "data-offset") + base_offset;
+	length = fdt_getprop_u32(fit, node, "data-size");
+	load = fdt_getprop_u32(fit, node, "load");
+	if (load == -1U && image_info)
+		load = image_info->load_addr;
+	entry = fdt_getprop_u32(fit, node, "entry");
+
+	overhead = get_aligned_image_overhead(info, offset);
+	nr_sectors = get_aligned_image_size(info, overhead + length, offset);
+
+	if (info->read(info, sector + get_aligned_image_offset(info, offset),
+		       nr_sectors, (void*)load) != nr_sectors)
+		return -EIO;
+	debug("image: dst=%lx, offset=%lx, size=%lx\n", load, offset,
+	      (unsigned long)length);
+
+	src = (void *)load + overhead;
+#ifdef CONFIG_SPL_FIT_IMAGE_POST_PROCESS
+	board_fit_image_post_process(&src, &length);
+#endif
+
+	memcpy((void*)load, src, length);
+
+	if (image_info) {
+		image_info->load_addr = load;
+		image_info->size = length;
+		image_info->entry_point = entry;
+	}
+
+	return 0;
+}
+
 int spl_load_simple_fit(struct spl_image_info *spl_image,
 			struct spl_load_info *info, ulong sector, void *fit)
 {
 	int sectors;
-	ulong size, load;
+	ulong size;
 	unsigned long count;
+	struct spl_image_info image_info;
 	int node, images;
-	void *load_ptr;
-	int fdt_offset, fdt_len;
-	int data_offset, data_size;
 	int base_offset, align_len = ARCH_DMA_MINALIGN - 1;
-	int src_sector;
-	void *dst, *src;
 
 	/*
 	 * Figure out where the external images start. This is the base for the
@@ -202,82 +241,23 @@ int spl_load_simple_fit(struct spl_image_info *spl_image,
 		return -1;
 	}
 
-	/* Get its information and set up the spl_image structure */
-	data_offset = fdt_getprop_u32(fit, node, "data-offset");
-	data_size = fdt_getprop_u32(fit, node, "data-size");
-	load = fdt_getprop_u32(fit, node, "load");
-	debug("data_offset=%x, data_size=%x\n", data_offset, data_size);
-	spl_image->load_addr = load;
-	spl_image->entry_point = load;
+	/* Load the image and set up the spl_image structure */
+	spl_load_fit_image(info, sector, fit, base_offset, node, spl_image);
 	spl_image->os = IH_OS_U_BOOT;
 
-	/*
-	 * Work out where to place the image. We read it so that the first
-	 * byte will be at 'load'. This may mean we need to load it starting
-	 * before then, since we can only read whole blocks.
-	 */
-	data_offset += base_offset;
-	sectors = get_aligned_image_size(info, data_size, data_offset);
-	load_ptr = (void *)load;
-	debug("U-Boot size %x, data %p\n", data_size, load_ptr);
-	dst = load_ptr;
-
-	/* Read the image */
-	src_sector = sector + get_aligned_image_offset(info, data_offset);
-	debug("Aligned image read: dst=%p, src_sector=%x, sectors=%x\n",
-	      dst, src_sector, sectors);
-	count = info->read(info, src_sector, sectors, dst);
-	if (count != sectors)
-		return -EIO;
-	debug("image: dst=%p, data_offset=%x, size=%x\n", dst, data_offset,
-	      data_size);
-	src = dst + get_aligned_image_overhead(info, data_offset);
-
-#ifdef CONFIG_SPL_FIT_IMAGE_POST_PROCESS
-	board_fit_image_post_process((void **)&src, (size_t *)&data_size);
-#endif
-
-	memcpy(dst, src, data_size);
-
 	/* Figure out which device tree the board wants to use */
 	node = spl_fit_get_image_node(fit, images, FIT_FDT_PROP, 0);
 	if (node < 0) {
 		debug("%s: cannot find FDT node\n", __func__);
 		return node;
 	}
-	fdt_offset = fdt_getprop_u32(fit, node, "data-offset");
-	fdt_len = fdt_getprop_u32(fit, node, "data-size");
 
 	/*
-	 * Read the device tree and place it after the image. There may be
-	 * some extra data before it since we can only read entire blocks.
-	 * And also align the destination address to ARCH_DMA_MINALIGN.
+	 * Read the device tree and place it after the image.
+	 * Align the destination address to ARCH_DMA_MINALIGN.
 	 */
-	dst = (void *)((load + data_size + align_len) & ~align_len);
-	fdt_offset += base_offset;
-	sectors = get_aligned_image_size(info, fdt_len, fdt_offset);
-	src_sector = sector + get_aligned_image_offset(info, fdt_offset);
-	count = info->read(info, src_sector, sectors, dst);
-	debug("Aligned fdt read: dst %p, src_sector = %x, sectors %x\n",
-	      dst, src_sector, sectors);
-	if (count != sectors)
-		return -EIO;
-
-	/*
-	 * Copy the device tree so that it starts immediately after the image.
-	 * After this we will have the U-Boot image and its device tree ready
-	 * for us to start.
-	 */
-	debug("fdt: dst=%p, data_offset=%x, size=%x\n", dst, fdt_offset,
-	      fdt_len);
-	src = dst + get_aligned_image_overhead(info, fdt_offset);
-	dst = load_ptr + data_size;
-
-#ifdef CONFIG_SPL_FIT_IMAGE_POST_PROCESS
-	board_fit_image_post_process((void **)&src, (size_t *)&fdt_len);
-#endif
-
-	memcpy(dst, src, fdt_len);
+	image_info.load_addr = spl_image->load_addr + spl_image->size;
+	spl_load_fit_image(info, sector, fit, base_offset, node, &image_info);
 
 	return 0;
 }
-- 
2.8.2