sparse: Implement storage abstraction

The current sparse image parser relies heavily on the MMC layer, and
doesn't allow any other kind of storage medium to be used.

Rework the parser to support any kind of storage medium, as long as there
is an implementation for it.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Reviewed-by: Tom Rini <trini@konsulko.com>

1 files changed, 50 insertions, 27 deletions

diff --git a/common/aboot.c b/common/aboot.c
index 5f5fb6b..6c35d82 100644
--- a/common/aboot.c
+++ b/common/aboot.c
@@ -58,6 +58,13 @@ static unsigned int sparse_get_chunk_data_size(sparse_header_t *sparse,
 	return chunk->total_sz - sparse->chunk_hdr_sz;
 }
 
+static unsigned int sparse_block_size_to_storage(unsigned int size,
+						 sparse_storage_t *storage,
+						 sparse_header_t *sparse)
+{
+	return size * sparse->blk_sz / storage->block_sz;
+}
+
 static bool sparse_chunk_has_buffer(chunk_header_t *chunk)
 {
 	switch (chunk->chunk_type) {
@@ -257,20 +264,26 @@ static void sparse_put_data_buffer(sparse_buffer_t *buffer)
 	free(buffer);
 }
 
-int write_sparse_image(block_dev_desc_t *dev_desc,
-		       disk_partition_t *info, const char *part_name,
-		       void *data, unsigned sz)
+int store_sparse_image(sparse_storage_t *storage,
+		       void *storage_priv, void *data)
 {
-	lbaint_t start;
-	lbaint_t blkcnt;
 	unsigned int chunk, offset;
 	sparse_header_t *sparse_header;
 	chunk_header_t *chunk_header;
 	sparse_buffer_t *buffer;
+	uint32_t start;
 	uint32_t total_blocks = 0;
 	uint32_t skipped = 0;
 	int i;
 
+	debug("=== Storage ===\n");
+	debug("name: %s\n", storage->name);
+	debug("block_size: 0x%x\n", storage->block_sz);
+	debug("start: 0x%x\n", storage->start);
+	debug("size: 0x%x\n", storage->size);
+	debug("write: 0x%p\n", storage->write);
+	debug("priv: 0x%p\n", storage_priv);
+
 	sparse_header = sparse_parse_header(&data);
 	if (!sparse_header) {
 		printf("sparse header issue\n");
@@ -281,7 +294,7 @@ int write_sparse_image(block_dev_desc_t *dev_desc,
 	 * Verify that the sparse block size is a multiple of our
 	 * storage backend block size
 	 */
-	div_u64_rem(sparse_header->blk_sz, info->blksz, &offset);
+	div_u64_rem(sparse_header->blk_sz, storage->block_sz, &offset);
 	if (offset) {
 		printf("%s: Sparse image block size issue [%u]\n",
 		       __func__, sparse_header->blk_sz);
@@ -291,8 +304,10 @@ int write_sparse_image(block_dev_desc_t *dev_desc,
 	puts("Flashing Sparse Image\n");
 
 	/* Start processing chunks */
-	start = info->start;
+	start = storage->start;
 	for (chunk = 0; chunk < sparse_header->total_chunks; chunk++) {
+		uint32_t blkcnt;
+
 		chunk_header = sparse_parse_chunk(sparse_header, &data);
 		if (!chunk_header) {
 			printf("Unknown chunk type");
@@ -304,20 +319,22 @@ int write_sparse_image(block_dev_desc_t *dev_desc,
 		 * and go on parsing the rest of the chunks
 		 */
 		if (chunk_header->chunk_type == CHUNK_TYPE_DONT_CARE) {
-			skipped += chunk_header->chunk_sz;
+			skipped += sparse_block_size_to_storage(chunk_header->chunk_sz,
+								storage,
+								sparse_header);
 			continue;
 		}
 
 		/* Retrieve the buffer we're going to write */
 		buffer = sparse_get_data_buffer(sparse_header, chunk_header,
-						info->blksz, &data);
+						storage->block_sz, &data);
 		if (!buffer)
 			continue;
 
-		blkcnt = (buffer->length / info->blksz) * buffer->repeat;
+		blkcnt = (buffer->length / storage->block_sz) * buffer->repeat;
 
 		if ((start + total_blocks + blkcnt) >
-		    (info->start + info->size)) {
+		    (storage->start + storage->size)) {
 			printf("%s: Request would exceed partition size!\n",
 			       __func__);
 			return -EINVAL;
@@ -325,30 +342,36 @@ int write_sparse_image(block_dev_desc_t *dev_desc,
 
 		for (i = 0; i < buffer->repeat; i++) {
 			unsigned long buffer_blk_cnt;
-			unsigned long buffer_blks;
-
-			buffer_blk_cnt = buffer->length / info->blksz;
-
-			buffer_blks = dev_desc->block_write(dev_desc->dev,
-							    start + total_blocks,
-							    buffer_blk_cnt, buffer->data);
-			if (buffer_blks != buffer_blk_cnt) {
-				printf("%s: Write %d failed " LBAFU "\n",
-				       __func__, i, buffer_blks);
-				return -EIO;
+			int ret;
+
+			buffer_blk_cnt = buffer->length / storage->block_sz;
+
+			ret = storage->write(storage, storage_priv,
+					     start + total_blocks,
+					     buffer_blk_cnt,
+					     buffer->data);
+			if (ret < 0) {
+				printf("%s: Write %d failed %d\n",
+				       __func__, i, ret);
+				return ret;
 			}
 
-			total_blocks += buffer_blk_cnt;
+			total_blocks += ret;
 		}
 
 		sparse_put_data_buffer(buffer);
 	}
 
 	debug("Wrote %d blocks, skipped %d, expected to write %d blocks\n",
-	      total_blocks, skipped, sparse_header->total_blks);
-	printf("........ wrote %d blocks to '%s'\n", total_blocks, part_name);
-
-	if (total_blocks != sparse_header->total_blks) {
+	      total_blocks, skipped,
+	      sparse_block_size_to_storage(sparse_header->total_blks,
+					   storage, sparse_header));
+	printf("........ wrote %d blocks to '%s'\n", total_blocks,
+	       storage->name);
+
+	if ((total_blocks + skipped) !=
+	    sparse_block_size_to_storage(sparse_header->total_blks,
+					 storage, sparse_header)) {
 		printf("sparse image write failure\n");
 		return -EIO;
 	}