[PATCH v2 01/12] mtd: nand_bbt: new header for nand family BBT

Mon Dec 14 21:59:27 PST 2015

From: Brian Norris <computersforpeace at gmail.com>

Migrating existing BBT definitions from bbm.h to nand_bbt.h

Signed-off-by: Brian Norris <computersforpeace at gmail.com>
[Peter: correct misspelling. s/neccecary/necessary/]
Signed-off-by: Peter Pan <peterpandong at micron.com>
---
 include/linux/mtd/bbm.h      |  96 +----------------------------------
 include/linux/mtd/nand_bbt.h | 118 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 119 insertions(+), 95 deletions(-)
 create mode 100644 include/linux/mtd/nand_bbt.h

diff --git a/include/linux/mtd/bbm.h b/include/linux/mtd/bbm.h
index 36bb6a5..fb751d9 100644
--- a/include/linux/mtd/bbm.h
+++ b/include/linux/mtd/bbm.h
@@ -28,102 +28,8 @@
 #ifndef __LINUX_MTD_BBM_H
 #define __LINUX_MTD_BBM_H
 
-/* The maximum number of NAND chips in an array */
-#define NAND_MAX_CHIPS		8
+#include <linux/mtd/nand_bbt.h>
 
-/**
- * struct nand_bbt_descr - bad block table descriptor
- * @options:	options for this descriptor
- * @pages:	the page(s) where we find the bbt, used with option BBT_ABSPAGE
- *		when bbt is searched, then we store the found bbts pages here.
- *		Its an array and supports up to 8 chips now
- * @offs:	offset of the pattern in the oob area of the page
- * @veroffs:	offset of the bbt version counter in the oob are of the page
- * @version:	version read from the bbt page during scan
- * @len:	length of the pattern, if 0 no pattern check is performed
- * @maxblocks:	maximum number of blocks to search for a bbt. This number of
- *		blocks is reserved at the end of the device where the tables are
- *		written.
- * @reserved_block_code: if non-0, this pattern denotes a reserved (rather than
- *              bad) block in the stored bbt
- * @pattern:	pattern to identify bad block table or factory marked good /
- *		bad blocks, can be NULL, if len = 0
- *
- * Descriptor for the bad block table marker and the descriptor for the
- * pattern which identifies good and bad blocks. The assumption is made
- * that the pattern and the version count are always located in the oob area
- * of the first block.
- */
-struct nand_bbt_descr {
-	int options;
-	int pages[NAND_MAX_CHIPS];
-	int offs;
-	int veroffs;
-	uint8_t version[NAND_MAX_CHIPS];
-	int len;
-	int maxblocks;
-	int reserved_block_code;
-	uint8_t *pattern;
-};
-
-/* Options for the bad block table descriptors */
-
-/* The number of bits used per block in the bbt on the device */
-#define NAND_BBT_NRBITS_MSK	0x0000000F
-#define NAND_BBT_1BIT		0x00000001
-#define NAND_BBT_2BIT		0x00000002
-#define NAND_BBT_4BIT		0x00000004
-#define NAND_BBT_8BIT		0x00000008
-/* The bad block table is in the last good block of the device */
-#define NAND_BBT_LASTBLOCK	0x00000010
-/* The bbt is at the given page, else we must scan for the bbt */
-#define NAND_BBT_ABSPAGE	0x00000020
-/* bbt is stored per chip on multichip devices */
-#define NAND_BBT_PERCHIP	0x00000080
-/* bbt has a version counter at offset veroffs */
-#define NAND_BBT_VERSION	0x00000100
-/* Create a bbt if none exists */
-#define NAND_BBT_CREATE		0x00000200
-/*
- * Create an empty BBT with no vendor information. Vendor's information may be
- * unavailable, for example, if the NAND controller has a different data and OOB
- * layout or if this information is already purged. Must be used in conjunction
- * with NAND_BBT_CREATE.
- */
-#define NAND_BBT_CREATE_EMPTY	0x00000400
-/* Write bbt if neccecary */
-#define NAND_BBT_WRITE		0x00002000
-/* Read and write back block contents when writing bbt */
-#define NAND_BBT_SAVECONTENT	0x00004000
-/* Search good / bad pattern on the first and the second page */
-#define NAND_BBT_SCAN2NDPAGE	0x00008000
-/* Search good / bad pattern on the last page of the eraseblock */
-#define NAND_BBT_SCANLASTPAGE	0x00010000
-/*
- * Use a flash based bad block table. By default, OOB identifier is saved in
- * OOB area. This option is passed to the default bad block table function.
- */
-#define NAND_BBT_USE_FLASH	0x00020000
-/*
- * Do not store flash based bad block table marker in the OOB area; store it
- * in-band.
- */
-#define NAND_BBT_NO_OOB		0x00040000
-/*
- * Do not write new bad block markers to OOB; useful, e.g., when ECC covers
- * entire spare area. Must be used with NAND_BBT_USE_FLASH.
- */
-#define NAND_BBT_NO_OOB_BBM	0x00080000
-
-/*
- * Flag set by nand_create_default_bbt_descr(), marking that the nand_bbt_descr
- * was allocated dynamicaly and must be freed in nand_release(). Has no meaning
- * in nand_chip.bbt_options.
- */
-#define NAND_BBT_DYNAMICSTRUCT	0x80000000
-
-/* The maximum number of blocks to scan for a bbt */
-#define NAND_BBT_SCAN_MAXBLOCKS	4
 
 /*
  * Constants for oob configuration
diff --git a/include/linux/mtd/nand_bbt.h b/include/linux/mtd/nand_bbt.h
new file mode 100644
index 0000000..5a65230
--- /dev/null
+++ b/include/linux/mtd/nand_bbt.h
@@ -0,0 +1,118 @@
+/*
+ *  NAND family Bad Block Table support
+ *
+ *  Copyright © 2015 Broadcom Corporation
+ *  Brian Norris <computersforpeace at gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+#ifndef __LINUX_MTD_NAND_BBT_H
+#define __LINUX_MTD_NAND_BBT_H
+
+/* The maximum number of NAND chips in an array */
+#define NAND_MAX_CHIPS		8
+
+/**
+ * struct nand_bbt_descr - bad block table descriptor
+ * @options:	options for this descriptor
+ * @pages:	the page(s) where we find the bbt, used with option BBT_ABSPAGE
+ *		when bbt is searched, then we store the found bbts pages here.
+ *		Its an array and supports up to 8 chips now
+ * @offs:	offset of the pattern in the oob area of the page
+ * @veroffs:	offset of the bbt version counter in the oob are of the page
+ * @version:	version read from the bbt page during scan
+ * @len:	length of the pattern, if 0 no pattern check is performed
+ * @maxblocks:	maximum number of blocks to search for a bbt. This number of
+ *		blocks is reserved at the end of the device where the tables are
+ *		written.
+ * @reserved_block_code: if non-0, this pattern denotes a reserved (rather than
+ *              bad) block in the stored bbt
+ * @pattern:	pattern to identify bad block table or factory marked good /
+ *		bad blocks, can be NULL, if len = 0
+ *
+ * Descriptor for the bad block table marker and the descriptor for the
+ * pattern which identifies good and bad blocks. The assumption is made
+ * that the pattern and the version count are always located in the oob area
+ * of the first block.
+ */
+struct nand_bbt_descr {
+	int options;
+	int pages[NAND_MAX_CHIPS];
+	int offs;
+	int veroffs;
+	uint8_t version[NAND_MAX_CHIPS];
+	int len;
+	int maxblocks;
+	int reserved_block_code;
+	uint8_t *pattern;
+};
+
+/* Options for the bad block table descriptors */
+
+/* The number of bits used per block in the bbt on the device */
+#define NAND_BBT_NRBITS_MSK	0x0000000F
+#define NAND_BBT_1BIT		0x00000001
+#define NAND_BBT_2BIT		0x00000002
+#define NAND_BBT_4BIT		0x00000004
+#define NAND_BBT_8BIT		0x00000008
+/* The bad block table is in the last good block of the device */
+#define NAND_BBT_LASTBLOCK	0x00000010
+/* The bbt is at the given page, else we must scan for the bbt */
+#define NAND_BBT_ABSPAGE	0x00000020
+/* bbt is stored per chip on multichip devices */
+#define NAND_BBT_PERCHIP	0x00000080
+/* bbt has a version counter at offset veroffs */
+#define NAND_BBT_VERSION	0x00000100
+/* Create a bbt if none exists */
+#define NAND_BBT_CREATE		0x00000200
+/*
+ * Create an empty BBT with no vendor information. Vendor's information may be
+ * unavailable, for example, if the NAND controller has a different data and OOB
+ * layout or if this information is already purged. Must be used in conjunction
+ * with NAND_BBT_CREATE.
+ */
+#define NAND_BBT_CREATE_EMPTY	0x00000400
+/* Write bbt if necessary */
+#define NAND_BBT_WRITE		0x00002000
+/* Read and write back block contents when writing bbt */
+#define NAND_BBT_SAVECONTENT	0x00004000
+/* Search good / bad pattern on the first and the second page */
+#define NAND_BBT_SCAN2NDPAGE	0x00008000
+/* Search good / bad pattern on the last page of the eraseblock */
+#define NAND_BBT_SCANLASTPAGE	0x00010000
+/*
+ * Use a flash based bad block table. By default, OOB identifier is saved in
+ * OOB area. This option is passed to the default bad block table function.
+ */
+#define NAND_BBT_USE_FLASH	0x00020000
+/*
+ * Do not store flash based bad block table marker in the OOB area; store it
+ * in-band.
+ */
+#define NAND_BBT_NO_OOB		0x00040000
+/*
+ * Do not write new bad block markers to OOB; useful, e.g., when ECC covers
+ * entire spare area. Must be used with NAND_BBT_USE_FLASH.
+ */
+#define NAND_BBT_NO_OOB_BBM	0x00080000
+
+/*
+ * Flag set by nand_create_default_bbt_descr(), marking that the nand_bbt_descr
+ * was allocated dynamicaly and must be freed in nand_release(). Has no meaning
+ * in nand_chip.bbt_options.
+ */
+#define NAND_BBT_DYNAMICSTRUCT	0x80000000
+
+/* The maximum number of blocks to scan for a bbt */
+#define NAND_BBT_SCAN_MAXBLOCKS	4
+
+#endif	/* __LINUX_MTD_NAND_BBT_H */
-- 
1.9.1


