[U-Boot] [PATCH 4/5] fastboot: sparse: implement reserve()

[Steve Rae]

In order to process the CHUNK_TYPE_DONT_CARE properly, there is
a requirement to be able to 'reserve' a specified number of blocks
in the storage media. Because of the special handling of "bad blocks"
in NAND devices, this is implemented in a storage abstraction function.

Signed-off-by: Steve Rae <srae at broadcom.com>
---

 common/fb_mmc.c        |  7 +++++++
 common/fb_nand.c       | 20 ++++++++++++++++++++
 common/image-sparse.c  |  5 ++---
 include/image-sparse.h |  4 ++++
 4 files changed, 33 insertions(+), 3 deletions(-)

diff --git a/common/fb_mmc.c b/common/fb_mmc.c
index 6bafbc6..c739651 100644
--- a/common/fb_mmc.c
+++ b/common/fb_mmc.c
@@ -53,6 +53,12 @@ static lbaint_t fb_mmc_sparse_write(struct sparse_storage *info,
 	return blk_dwrite(dev_desc, blk, blkcnt, buffer);
 }
 
+static lbaint_t fb_mmc_sparse_reserve(struct sparse_storage *info,
+		lbaint_t blk, lbaint_t blkcnt)
+{
+	return blkcnt;
+}
+
 static void write_raw_image(struct blk_desc *dev_desc, disk_partition_t *info,
 		const char *part_name, void *buffer,
 		unsigned int download_bytes)
@@ -131,6 +137,7 @@ void fb_mmc_flash_write(const char *cmd, void *download_buffer,
 		sparse.start = info.start;
 		sparse.size = info.size;
 		sparse.write = fb_mmc_sparse_write;
+		sparse.reserve = fb_mmc_sparse_reserve;
 
 		printf("Flashing sparse image at offset " LBAFU "\n",
 		       sparse.start);
diff --git a/common/fb_nand.c b/common/fb_nand.c
index b5a3820..ce63006 100644
--- a/common/fb_nand.c
+++ b/common/fb_nand.c
@@ -126,6 +126,25 @@ static lbaint_t fb_nand_sparse_write(struct sparse_storage *info,
 	return written / info->blksz;
 }
 
+static lbaint_t fb_nand_sparse_reserve(struct sparse_storage *info,
+		lbaint_t blk, lbaint_t blkcnt)
+{
+	int bad_blocks = 0;
+
+/*
+ * TODO - implement a function to determine the total number
+ * of blocks which must be used in order to reserve the specified
+ * number ("blkcnt") of "good-blocks", starting at "blk"...
+ * ( possibly something like the "check_skip_len()" function )
+ */
+
+	/*
+	 * the return value must be 'blkcnt' ("good-blocks") plus the
+	 * number of "bad-blocks" encountered within this space...
+	 */
+	return blkcnt + bad_blocks;
+}
+
 void fb_nand_flash_write(const char *cmd, void *download_buffer,
 			 unsigned int download_bytes)
 {
@@ -155,6 +174,7 @@ void fb_nand_flash_write(const char *cmd, void *download_buffer,
 		sparse.start = part->offset / sparse.blksz;
 		sparse.size = part->size / sparse.blksz;
 		sparse.write = fb_nand_sparse_write;
+		sparse.reserve = fb_nand_sparse_reserve;
 
 		printf("Flashing sparse image at offset " LBAFU "\n",
 		       sparse.start);
diff --git a/common/image-sparse.c b/common/image-sparse.c
index b36703b..9632c6f 100644
--- a/common/image-sparse.c
+++ b/common/image-sparse.c
@@ -1,3 +1,4 @@
+
 /*
  * Copyright (c) 2009, Google Inc.
  * All rights reserved.
@@ -210,10 +211,8 @@ void write_sparse_image(
 			break;
 
 		case CHUNK_TYPE_DONT_CARE:
-#ifdef CONFIG_FASTBOOT_FLASH_MMC_DEV
-			blk += blkcnt;
+			blk += info->reserve(info, blk, blkcnt);
 			total_blocks += chunk_header->chunk_sz;
-#endif
 			break;
 
 		case CHUNK_TYPE_CRC32:
diff --git a/include/image-sparse.h b/include/image-sparse.h
index f6869d6..b0cc500 100644
--- a/include/image-sparse.h
+++ b/include/image-sparse.h
@@ -19,6 +19,10 @@ struct sparse_storage {
 				 lbaint_t blk,
 				 lbaint_t blkcnt,
 				 const void *buffer);
+
+	lbaint_t	(*reserve)(struct sparse_storage *info,
+				 lbaint_t blk,
+				 lbaint_t blkcnt);
 };
 
 static inline int is_sparse_image(void *buf)
-- 
1.8.5