mtd: move & update nand_ecclayout structure (plus board changes)

nand_ecclayout is present in mtd.h at Linux.
Move this structure to mtd.h to comply with Linux.

Also, increase the ecc placement locations to 640 to suport device having
writesize/oobsize of 8KB/640B. This means that the maximum oobsize has gone
up to 640 bytes and consequently the maximum ecc placement locations have
also gone up to 640.

Changes from Prabhabkar's version (squashed into one patch to preserve
bisectability):
 - Added _LARGE to MTD_MAX_*_ENTRIES

   This makes the names match current Linux source, and resolves
   a conflict between
   http://patchwork.ozlabs.org/patch/280488/
   and
   http://patchwork.ozlabs.org/patch/284513/

   The former was posted first and is closer to matching Linux, but
   unlike Linux it does not add _LARGE to the names.  The second adds
   _LARGE to one of the names, and depends on it in a subsequent patch
   (http://patchwork.ozlabs.org/patch/284512/).

 - Made max oobfree/eccpos configurable, and used this on tricorder,
   alpr, ASH405, T4160QDS, and T4240QDS (these boards failed to build
   for me without doing so, due to a size increase).

   On tricorder SPL, this saves 2576 bytes (and makes the SPL build
   again) versus the new default of 640 eccpos and 32 oobfree, and
   saves 336 bytes versus the old default of 128 eccpos and 8 oobfree.

Signed-off-by: Prabhakar Kushwaha <prabhakar@freescale.com>
CC: Vipin Kumar <vipin.kumar@st.com>
[scottwood@freescale.com: changes as described above]
Signed-off-by: Scott Wood <scottwood@freescale.com>
Cc: Thomas Weber <weber@corscience.de>
Cc: Matthias Fuchs <matthias.fuchs@esd-electronics.com>
Cc: Stefan Roese <sr@denx.de>
Cc: York Sun <yorksun@freescale.com>
Cc: Tom Rini <trini@ti.com>
Reviewed-by: Stefan Roese <sr@denx.de>

9 files changed, 53 insertions, 17 deletions

diff --git a/doc/README.nand b/doc/README.nand
index 913e9b50b8..3a507b6c81 100644
--- a/doc/README.nand
+++ b/doc/README.nand
@@ -104,6 +104,16 @@ Configuration Options:
    CONFIG_SYS_MAX_NAND_DEVICE
       The maximum number of NAND devices you want to support.
 
+   CONFIG_SYS_NAND_MAX_ECCPOS
+      If specified, overrides the maximum number of ECC bytes
+      supported.  Useful for reducing image size, especially with SPL.
+      This must be at least 48 if nand_base.c is used.
+
+   CONFIG_SYS_NAND_MAX_OOBFREE
+      If specified, overrides the maximum number of free OOB regions
+      supported.  Useful for reducing image size, especially with SPL.
+      This must be at least 2 if nand_base.c is used.
+
    CONFIG_SYS_NAND_MAX_CHIPS
       The maximum number of NAND chips per device to be supported.
 
diff --git a/drivers/mtd/onenand/onenand_base.c b/drivers/mtd/onenand/onenand_base.c
index 067f8ef184..979e4af7c5 100644
--- a/drivers/mtd/onenand/onenand_base.c
+++ b/drivers/mtd/onenand/onenand_base.c
@@ -761,7 +761,8 @@ static int onenand_transfer_auto_oob(struct mtd_info *mtd, uint8_t *buf,
 	uint8_t *oob_buf = this->oob_buf;
 
 	free = this->ecclayout->oobfree;
-	for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES && free->length; i++, free++) {
+	for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES_LARGE && free->length;
+	     i++, free++) {
 		if (readcol >= lastgap)
 			readcol += free->offset - lastgap;
 		if (readend >= lastgap)
@@ -770,7 +771,8 @@ static int onenand_transfer_auto_oob(struct mtd_info *mtd, uint8_t *buf,
 	}
 	this->read_bufferram(mtd, 0, ONENAND_SPARERAM, oob_buf, 0, mtd->oobsize);
 	free = this->ecclayout->oobfree;
-	for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES && free->length; i++, free++) {
+	for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES_LARGE && free->length;
+	     i++, free++) {
 		int free_end = free->offset + free->length;
 		if (free->offset < readend && free_end > readcol) {
 			int st = max_t(int,free->offset,readcol);
@@ -1356,7 +1358,8 @@ static int onenand_fill_auto_oob(struct mtd_info *mtd, u_char *oob_buf,
 	unsigned int i;
 
 	free = this->ecclayout->oobfree;
-	for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES && free->length; i++, free++) {
+	for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES_LARGE && free->length;
+	     i++, free++) {
 		if (writecol >= lastgap)
 			writecol += free->offset - lastgap;
 		if (writeend >= lastgap)
@@ -1364,7 +1367,8 @@ static int onenand_fill_auto_oob(struct mtd_info *mtd, u_char *oob_buf,
 		lastgap = free->offset + free->length;
 	}
 	free = this->ecclayout->oobfree;
-	for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES && free->length; i++, free++) {
+	for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES_LARGE && free->length;
+	     i++, free++) {
 		int free_end = free->offset + free->length;
 		if (free->offset < writeend && free_end > writecol) {
 			int st = max_t(int,free->offset,writecol);
@@ -2750,7 +2754,8 @@ int onenand_scan(struct mtd_info *mtd, int maxchips)
 	 * the out of band area
 	 */
 	this->ecclayout->oobavail = 0;
-	for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES &&
+
+	for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES_LARGE &&
 	    this->ecclayout->oobfree[i].length; i++)
 		this->ecclayout->oobavail +=
 			this->ecclayout->oobfree[i].length;
diff --git a/include/configs/ASH405.h b/include/configs/ASH405.h
index 9460be3b59..2f5340723d 100644
--- a/include/configs/ASH405.h
+++ b/include/configs/ASH405.h
@@ -143,6 +143,8 @@
 
 #define CONFIG_SYS_NAND_SKIP_BAD_DOT_I	1	/* ".i" read skips bad blocks   */
 #define CONFIG_SYS_NAND_QUIET		1
+#define CONFIG_SYS_NAND_MAX_OOBFREE	2
+#define CONFIG_SYS_NAND_MAX_ECCPOS	56
 
 /*-----------------------------------------------------------------------
  * PCI stuff
diff --git a/include/configs/MPC8572DS.h b/include/configs/MPC8572DS.h
index c7511449ea..9ad94021e4 100644
--- a/include/configs/MPC8572DS.h
+++ b/include/configs/MPC8572DS.h
@@ -322,6 +322,8 @@
 #define CONFIG_CMD_NAND		1
 #define CONFIG_NAND_FSL_ELBC	1
 #define CONFIG_SYS_NAND_BLOCK_SIZE    (128 * 1024)
+#define CONFIG_SYS_NAND_MAX_OOBFREE	5
+#define CONFIG_SYS_NAND_MAX_ECCPOS	56
 
 /* NAND boot: 4K NAND loader config */
 #define CONFIG_SYS_NAND_SPL_SIZE	0x1000
diff --git a/include/configs/T4240QDS.h b/include/configs/T4240QDS.h
index 3777ccb835..c96df54d99 100644
--- a/include/configs/T4240QDS.h
+++ b/include/configs/T4240QDS.h
@@ -229,6 +229,8 @@ unsigned long get_board_ddr_clk(void);
 #define CONFIG_CMD_NAND
 
 #define CONFIG_SYS_NAND_BLOCK_SIZE	(128 * 1024)
+#define CONFIG_SYS_NAND_MAX_OOBFREE	2
+#define CONFIG_SYS_NAND_MAX_ECCPOS	256
 
 #if defined(CONFIG_NAND)
 #define CONFIG_SYS_CSPR0_EXT		CONFIG_SYS_NAND_CSPR_EXT
diff --git a/include/configs/alpr.h b/include/configs/alpr.h
index 2bf1986e3a..61fdebac3f 100644
--- a/include/configs/alpr.h
+++ b/include/configs/alpr.h
@@ -324,6 +324,8 @@
 #define CONFIG_SYS_NAND_BASE_LIST	{ CONFIG_SYS_NAND_BASE + 0, CONFIG_SYS_NAND_BASE + 2,	\
 				  CONFIG_SYS_NAND_BASE + 4, CONFIG_SYS_NAND_BASE + 6 }
 #define CONFIG_SYS_NAND_QUIET_TEST	1	/* don't warn upon unknown NAND flash	*/
+#define CONFIG_SYS_NAND_MAX_OOBFREE	2
+#define CONFIG_SYS_NAND_MAX_ECCPOS	56
 
 /*-----------------------------------------------------------------------
  * External Bus Controller (EBC) Setup
diff --git a/include/configs/tricorder.h b/include/configs/tricorder.h
index d57394e550..590eab7e48 100644
--- a/include/configs/tricorder.h
+++ b/include/configs/tricorder.h
@@ -140,6 +140,8 @@
 							/* devices */
 #define CONFIG_NAND_OMAP_BCH8
 #define CONFIG_BCH
+#define CONFIG_SYS_NAND_MAX_OOBFREE	2
+#define CONFIG_SYS_NAND_MAX_ECCPOS	56
 
 /* commands to include */
 #include <config_cmd_default.h>
diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
index 6f44abdc16..a65b681551 100644
--- a/include/linux/mtd/mtd.h
+++ b/include/linux/mtd/mtd.h
@@ -96,6 +96,29 @@ struct mtd_oob_ops {
 	uint8_t		*oobbuf;
 };
 
+#ifdef CONFIG_SYS_NAND_MAX_OOBFREE
+#define MTD_MAX_OOBFREE_ENTRIES_LARGE	CONFIG_SYS_NAND_MAX_OOBFREE
+#else
+#define MTD_MAX_OOBFREE_ENTRIES_LARGE	32
+#endif
+
+#ifdef CONFIG_SYS_NAND_MAX_ECCPOS
+#define MTD_MAX_ECCPOS_ENTRIES_LARGE	CONFIG_SYS_NAND_MAX_ECCPOS
+#else
+#define MTD_MAX_ECCPOS_ENTRIES_LARGE	640
+#endif
+
+/*
+ * ECC layout control structure. Exported to userspace for
+ * diagnosis and to allow creation of raw images
+ */
+struct nand_ecclayout {
+	uint32_t eccbytes;
+	uint32_t eccpos[MTD_MAX_ECCPOS_ENTRIES_LARGE];
+	uint32_t oobavail;
+	struct nand_oobfree oobfree[MTD_MAX_OOBFREE_ENTRIES_LARGE];
+};
+
 struct mtd_info {
 	u_char type;
 	u_int32_t flags;
diff --git a/include/mtd/mtd-abi.h b/include/mtd/mtd-abi.h
index d51c1abd18..ac3c298760 100644
--- a/include/mtd/mtd-abi.h
+++ b/include/mtd/mtd-abi.h
@@ -155,18 +155,6 @@ struct nand_oobfree {
 	uint32_t length;
 };
 
-#define MTD_MAX_OOBFREE_ENTRIES	8
-/*
- * ECC layout control structure. Exported to userspace for
- * diagnosis and to allow creation of raw images
- */
-struct nand_ecclayout {
-	uint32_t eccbytes;
-	uint32_t eccpos[128];
-	uint32_t oobavail;
-	struct nand_oobfree oobfree[MTD_MAX_OOBFREE_ENTRIES];
-};
-
 /**
  * struct mtd_ecc_stats - error correction stats
  *