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Subject[PATCH 5/6] nand: big BBT overhaul
Date
Not complete. Need to actually allocate and initialize struct nand_bbt.

TBD: should struct nand_bbt be embedded in mtd_info? Might help provide
some automatic routine registration.

Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Signed-off-by: Peter Pan <peterpandong@micron.com>
---
drivers/mtd/nand/docg4.c | 3 +-
drivers/mtd/nand/nand_base.c | 53 +++--
drivers/mtd/nand/nand_bbt.c | 513 +++++++++++++++++--------------------------
include/linux/mtd/bbm.h | 44 +---
include/linux/mtd/nand.h | 4 +-
include/linux/mtd/nand_bbt.h | 160 ++++++++++++++
6 files changed, 406 insertions(+), 371 deletions(-)
create mode 100644 include/linux/mtd/nand_bbt.h

diff --git a/drivers/mtd/nand/docg4.c b/drivers/mtd/nand/docg4.c
index e5d7bca..9b671b9 100644
--- a/drivers/mtd/nand/docg4.c
+++ b/drivers/mtd/nand/docg4.c
@@ -1064,8 +1064,7 @@ static int __init read_factory_bbt(struct mtd_info *mtd)
unsigned long bits = ~buf[i];
for_each_set_bit(bitnum, &bits, 8) {
int badblock = block + 7 - bitnum;
- nand->bbt[badblock / 4] |=
- 0x03 << ((badblock % 4) * 2);
+ nand_bbt_markbad(nand->nand_bbt, badblock << nand->bbt_erase_shift);
mtd->ecc_stats.badblocks++;
dev_notice(doc->dev, "factory-marked bad block: %d\n",
badblock);
diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index df7eb4f..ff9db05 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -98,6 +98,9 @@ static int nand_get_device(struct mtd_info *mtd, int new_state);
static int nand_do_write_oob(struct mtd_info *mtd, loff_t to,
struct mtd_oob_ops *ops);

+static int nand_erase_nand(struct mtd_info *mtd, struct erase_info *instr,
+ int allowbbt);
+
/*
* For devices which display every fart in the system on a separate LED. Is
* compiled away when LED support is disabled.
@@ -451,8 +454,8 @@ static int nand_block_markbad_lowlevel(struct mtd_info *mtd, loff_t ofs)
}

/* Mark block bad in BBT */
- if (chip->bbt) {
- res = nand_markbad_bbt(mtd, ofs);
+ if (chip->nand_bbt) {
+ res = nand_bbt_markbad(chip->nand_bbt, ofs);
if (!ret)
ret = res;
}
@@ -494,10 +497,10 @@ static int nand_block_isreserved(struct mtd_info *mtd, loff_t ofs)
{
struct nand_chip *chip = mtd->priv;

- if (!chip->bbt)
+ if (!chip->nand_bbt)
return 0;
/* Return info from the table */
- return nand_isreserved_bbt(mtd, ofs);
+ return nand_bbt_isreserved(chip->nand_bbt, ofs);
}

/**
@@ -514,12 +517,25 @@ static int nand_block_checkbad(struct mtd_info *mtd, loff_t ofs, int getchip,
int allowbbt)
{
struct nand_chip *chip = mtd->priv;
+ struct nand_bbt *bbt = chip->nand_bbt;

- if (!chip->bbt)
+ if (!bbt)
return chip->block_bad(mtd, ofs, getchip);

/* Return info from the table */
- return nand_isbad_bbt(mtd, ofs, allowbbt);
+ if (nand_bbt_isbad(bbt, ofs))
+ return 1;
+ else if (allowbbt)
+ return 0;
+ else
+ return nand_bbt_isreserved(bbt, ofs);
+}
+
+static int nand_default_bbt(struct mtd_info *mtd)
+{
+ struct nand_chip *chip = mtd->priv;
+
+ return nand_bbt_init(chip->nand_bbt);
}

/**
@@ -2711,7 +2727,7 @@ static int nand_erase(struct mtd_info *mtd, struct erase_info *instr)
*
* Erase one ore more blocks.
*/
-int nand_erase_nand(struct mtd_info *mtd, struct erase_info *instr,
+static int nand_erase_nand(struct mtd_info *mtd, struct erase_info *instr,
int allowbbt)
{
int page, status, pages_per_block, ret, chipnr;
@@ -2818,6 +2834,20 @@ erase_exit:
return ret;
}

+/* NAND BBT helper - erase a block, including reserved blocks */
+static int nand_bbt_erase_block(struct mtd_info *mtd, loff_t addr)
+{
+ struct erase_info einfo;
+ struct nand_chip *chip = mtd->priv;
+
+ memset(&einfo, 0, sizeof(einfo));
+ einfo.mtd = mtd;
+ einfo.addr = addr;
+ einfo.len = 1ULL << chip->phys_erase_shift;
+
+ return nand_erase_nand(mtd, &einfo, 1);
+}
+
/**
* nand_sync - [MTD Interface] sync
* @mtd: MTD device structure
@@ -4236,14 +4266,11 @@ void nand_release(struct mtd_info *mtd)
mtd_device_unregister(mtd);

/* Free bad block table memory */
- kfree(chip->bbt);
+ if (chip->nand_bbt)
+ nand_bbt_release(chip->nand_bbt);
+ kfree(chip->nand_bbt);
if (!(chip->options & NAND_OWN_BUFFERS))
kfree(chip->buffers);
-
- /* Free bad block descriptor memory */
- if (chip->badblock_pattern && chip->badblock_pattern->options
- & NAND_BBT_DYNAMICSTRUCT)
- kfree(chip->badblock_pattern);
}
EXPORT_SYMBOL_GPL(nand_release);

diff --git a/drivers/mtd/nand/nand_bbt.c b/drivers/mtd/nand/nand_bbt.c
index 516db2c..27269ea 100644
--- a/drivers/mtd/nand/nand_bbt.c
+++ b/drivers/mtd/nand/nand_bbt.c
@@ -62,8 +62,7 @@
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/mtd/mtd.h>
-#include <linux/mtd/bbm.h>
-#include <linux/mtd/nand.h>
+#include <linux/mtd/nand_bbt.h>
#include <linux/bitops.h>
#include <linux/delay.h>
#include <linux/vmalloc.h>
@@ -78,20 +77,20 @@
#define BBT_ENTRY_MASK 0x03
#define BBT_ENTRY_SHIFT 2

-static int nand_update_bbt(struct mtd_info *mtd, loff_t offs);
+static int nand_update_bbt(struct nand_bbt *bbt, loff_t offs);

-static inline uint8_t bbt_get_entry(struct nand_chip *chip, int block)
+static inline uint8_t bbt_get_entry(struct nand_bbt *bbt, int block)
{
- uint8_t entry = chip->bbt[block >> BBT_ENTRY_SHIFT];
+ uint8_t entry = bbt->bbt[block >> BBT_ENTRY_SHIFT];
entry >>= (block & BBT_ENTRY_MASK) * 2;
return entry & BBT_ENTRY_MASK;
}

-static inline void bbt_mark_entry(struct nand_chip *chip, int block,
+static inline void bbt_mark_entry(struct nand_bbt *bbt, int block,
uint8_t mark)
{
uint8_t msk = (mark & BBT_ENTRY_MASK) << ((block & BBT_ENTRY_MASK) * 2);
- chip->bbt[block >> BBT_ENTRY_SHIFT] |= msk;
+ bbt->bbt[block >> BBT_ENTRY_SHIFT] |= msk;
}

static int check_pattern_no_oob(uint8_t *buf, struct nand_bbt_descr *td)
@@ -124,23 +123,6 @@ static int check_pattern(uint8_t *buf, int len, int paglen, struct nand_bbt_desc
}

/**
- * check_short_pattern - [GENERIC] check if a pattern is in the buffer
- * @buf: the buffer to search
- * @td: search pattern descriptor
- *
- * Check for a pattern at the given place. Used to search bad block tables and
- * good / bad block identifiers. Same as check_pattern, but no optional empty
- * check.
- */
-static int check_short_pattern(uint8_t *buf, struct nand_bbt_descr *td)
-{
- /* Compare the pattern */
- if (memcmp(buf + td->offs, td->pattern, td->len))
- return -1;
- return 0;
-}
-
-/**
* add_marker_len - compute the length of the marker in data area
* @td: BBT descriptor used for computation
*
@@ -161,7 +143,7 @@ static u32 add_marker_len(struct nand_bbt_descr *td)

/**
* read_bbt - [GENERIC] Read the bad block table starting from page
- * @mtd: MTD device structure
+ * @bbt: NAND BBT structure
* @buf: temporary buffer
* @page: the starting page
* @num: the number of bbt descriptors to read
@@ -170,11 +152,11 @@ static u32 add_marker_len(struct nand_bbt_descr *td)
*
* Read the bad block table starting from page.
*/
-static int read_bbt(struct mtd_info *mtd, uint8_t *buf, int page, int num,
+static int read_bbt(struct nand_bbt *bbt, uint8_t *buf, int page, int num,
struct nand_bbt_descr *td, int offs)
{
+ struct mtd_info *mtd = bbt->mtd;
int res, ret = 0, i, j, act = 0;
- struct nand_chip *this = mtd->priv;
size_t retlen, len, totlen;
loff_t from;
int bits = td->options & NAND_BBT_NRBITS_MSK;
@@ -184,10 +166,10 @@ static int read_bbt(struct mtd_info *mtd, uint8_t *buf, int page, int num,

totlen = (num * bits) >> 3;
marker_len = add_marker_len(td);
- from = ((loff_t)page) << this->page_shift;
+ from = ((loff_t)page) << bbt->page_shift;

while (totlen) {
- len = min(totlen, (size_t)(1 << this->bbt_erase_shift));
+ len = min(totlen, (size_t)(1 << bbt->bbt_erase_shift));
if (marker_len) {
/*
* In case the BBT marker is not in the OOB area it
@@ -223,8 +205,8 @@ static int read_bbt(struct mtd_info *mtd, uint8_t *buf, int page, int num,
if (reserved_block_code && (tmp == reserved_block_code)) {
pr_info("nand_read_bbt: reserved block at 0x%012llx\n",
(loff_t)(offs + act) <<
- this->bbt_erase_shift);
- bbt_mark_entry(this, offs + act,
+ bbt->bbt_erase_shift);
+ bbt_mark_entry(bbt, offs + act,
BBT_BLOCK_RESERVED);
mtd->ecc_stats.bbtblocks++;
continue;
@@ -235,13 +217,13 @@ static int read_bbt(struct mtd_info *mtd, uint8_t *buf, int page, int num,
*/
pr_info("nand_read_bbt: bad block at 0x%012llx\n",
(loff_t)(offs + act) <<
- this->bbt_erase_shift);
+ bbt->bbt_erase_shift);
/* Factory marked bad or worn out? */
if (tmp == 0)
- bbt_mark_entry(this, offs + act,
+ bbt_mark_entry(bbt, offs + act,
BBT_BLOCK_FACTORY_BAD);
else
- bbt_mark_entry(this, offs + act,
+ bbt_mark_entry(bbt, offs + act,
BBT_BLOCK_WORN);
mtd->ecc_stats.badblocks++;
}
@@ -254,7 +236,7 @@ static int read_bbt(struct mtd_info *mtd, uint8_t *buf, int page, int num,

/**
* read_abs_bbt - [GENERIC] Read the bad block table starting at a given page
- * @mtd: MTD device structure
+ * @bbt: NAND BBT structure
* @buf: temporary buffer
* @td: descriptor for the bad block table
* @chip: read the table for a specific chip, -1 read all chips; applies only if
@@ -263,25 +245,25 @@ static int read_bbt(struct mtd_info *mtd, uint8_t *buf, int page, int num,
* Read the bad block table for all chips starting at a given page. We assume
* that the bbt bits are in consecutive order.
*/
-static int read_abs_bbt(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *td, int chip)
+static int read_abs_bbt(struct nand_bbt *bbt, uint8_t *buf, struct nand_bbt_descr *td, int chip)
{
- struct nand_chip *this = mtd->priv;
+ struct mtd_info *mtd = bbt->mtd;
int res = 0, i;

if (td->options & NAND_BBT_PERCHIP) {
int offs = 0;
- for (i = 0; i < this->numchips; i++) {
+ for (i = 0; i < bbt->numchips; i++) {
if (chip == -1 || chip == i)
- res = read_bbt(mtd, buf, td->pages[i],
- this->chipsize >> this->bbt_erase_shift,
+ res = read_bbt(bbt, buf, td->pages[i],
+ bbt->chipsize >> bbt->bbt_erase_shift,
td, offs);
if (res)
return res;
- offs += this->chipsize >> this->bbt_erase_shift;
+ offs += bbt->chipsize >> bbt->bbt_erase_shift;
}
} else {
- res = read_bbt(mtd, buf, td->pages[0],
- mtd->size >> this->bbt_erase_shift, td, 0);
+ res = read_bbt(bbt, buf, td->pages[0],
+ mtd->size >> bbt->bbt_erase_shift, td, 0);
if (res)
return res;
}
@@ -289,7 +271,7 @@ static int read_abs_bbt(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_desc
}

/* BBT marker is in the first page, no OOB */
-static int scan_read_data(struct mtd_info *mtd, uint8_t *buf, loff_t offs,
+static int scan_read_data(struct nand_bbt *bbt, uint8_t *buf, loff_t offs,
struct nand_bbt_descr *td)
{
size_t retlen;
@@ -299,12 +281,12 @@ static int scan_read_data(struct mtd_info *mtd, uint8_t *buf, loff_t offs,
if (td->options & NAND_BBT_VERSION)
len++;

- return mtd_read(mtd, offs, len, &retlen, buf);
+ return mtd_read(bbt->mtd, offs, len, &retlen, buf);
}

/**
* scan_read_oob - [GENERIC] Scan data+OOB region to buffer
- * @mtd: MTD device structure
+ * @bbt: NAND BBT structure
* @buf: temporary buffer
* @offs: offset at which to scan
* @len: length of data region to read
@@ -313,9 +295,10 @@ static int scan_read_data(struct mtd_info *mtd, uint8_t *buf, loff_t offs,
* page,OOB,page,OOB,... in buf. Completes transfer and returns the "strongest"
* ECC condition (error or bitflip). May quit on the first (non-ECC) error.
*/
-static int scan_read_oob(struct mtd_info *mtd, uint8_t *buf, loff_t offs,
+static int scan_read_oob(struct nand_bbt *bbt, uint8_t *buf, loff_t offs,
size_t len)
{
+ struct mtd_info *mtd = bbt->mtd;
struct mtd_oob_ops ops;
int res, ret = 0;

@@ -343,13 +326,13 @@ static int scan_read_oob(struct mtd_info *mtd, uint8_t *buf, loff_t offs,
return ret;
}

-static int scan_read(struct mtd_info *mtd, uint8_t *buf, loff_t offs,
+static int scan_read(struct nand_bbt *bbt, uint8_t *buf, loff_t offs,
size_t len, struct nand_bbt_descr *td)
{
if (td->options & NAND_BBT_NO_OOB)
- return scan_read_data(mtd, buf, offs, td);
+ return scan_read_data(bbt, buf, offs, td);
else
- return scan_read_oob(mtd, buf, offs, len);
+ return scan_read_oob(bbt, buf, offs, len);
}

/* Scan write data with oob to flash */
@@ -368,8 +351,9 @@ static int scan_write_bbt(struct mtd_info *mtd, loff_t offs, size_t len,
return mtd_write_oob(mtd, offs, &ops);
}

-static u32 bbt_get_ver_offs(struct mtd_info *mtd, struct nand_bbt_descr *td)
+static u32 bbt_get_ver_offs(struct nand_bbt *bbt, struct nand_bbt_descr *td)
{
+ struct mtd_info *mtd = bbt->mtd;
u32 ver_offs = td->veroffs;

if (!(td->options & NAND_BBT_NO_OOB))
@@ -379,7 +363,7 @@ static u32 bbt_get_ver_offs(struct mtd_info *mtd, struct nand_bbt_descr *td)

/**
* read_abs_bbts - [GENERIC] Read the bad block table(s) for all chips starting at a given page
- * @mtd: MTD device structure
+ * @bbt: NAND BBT structure
* @buf: temporary buffer
* @td: descriptor for the bad block table
* @md: descriptor for the bad block table mirror
@@ -387,130 +371,86 @@ static u32 bbt_get_ver_offs(struct mtd_info *mtd, struct nand_bbt_descr *td)
* Read the bad block table(s) for all chips starting at a given page. We
* assume that the bbt bits are in consecutive order.
*/
-static void read_abs_bbts(struct mtd_info *mtd, uint8_t *buf,
+static void read_abs_bbts(struct nand_bbt *bbt, uint8_t *buf,
struct nand_bbt_descr *td, struct nand_bbt_descr *md)
{
- struct nand_chip *this = mtd->priv;
+ struct mtd_info *mtd = bbt->mtd;

/* Read the primary version, if available */
if (td->options & NAND_BBT_VERSION) {
- scan_read(mtd, buf, (loff_t)td->pages[0] << this->page_shift,
+ scan_read(bbt, buf, (loff_t)td->pages[0] << bbt->page_shift,
mtd->writesize, td);
- td->version[0] = buf[bbt_get_ver_offs(mtd, td)];
+ td->version[0] = buf[bbt_get_ver_offs(bbt, td)];
pr_info("Bad block table at page %d, version 0x%02X\n",
td->pages[0], td->version[0]);
}

/* Read the mirror version, if available */
if (md && (md->options & NAND_BBT_VERSION)) {
- scan_read(mtd, buf, (loff_t)md->pages[0] << this->page_shift,
+ scan_read(bbt, buf, (loff_t)md->pages[0] << bbt->page_shift,
mtd->writesize, md);
- md->version[0] = buf[bbt_get_ver_offs(mtd, md)];
+ md->version[0] = buf[bbt_get_ver_offs(bbt, md)];
pr_info("Bad block table at page %d, version 0x%02X\n",
md->pages[0], md->version[0]);
}
}

-/* Scan a given block partially */
-static int scan_block_fast(struct mtd_info *mtd, struct nand_bbt_descr *bd,
- loff_t offs, uint8_t *buf, int numpages)
-{
- struct mtd_oob_ops ops;
- int j, ret;
-
- ops.ooblen = mtd->oobsize;
- ops.oobbuf = buf;
- ops.ooboffs = 0;
- ops.datbuf = NULL;
- ops.mode = MTD_OPS_PLACE_OOB;
-
- for (j = 0; j < numpages; j++) {
- /*
- * Read the full oob until read_oob is fixed to handle single
- * byte reads for 16 bit buswidth.
- */
- ret = mtd_read_oob(mtd, offs, &ops);
- /* Ignore ECC errors when checking for BBM */
- if (ret && !mtd_is_bitflip_or_eccerr(ret))
- return ret;
-
- if (check_short_pattern(buf, bd))
- return 1;
-
- offs += mtd->writesize;
- }
- return 0;
-}
-
/**
* create_bbt - [GENERIC] Create a bad block table by scanning the device
- * @mtd: MTD device structure
+ * @bbt: NAND BBT structure
* @buf: temporary buffer
- * @bd: descriptor for the good/bad block search pattern
* @chip: create the table for a specific chip, -1 read all chips; applies only
* if NAND_BBT_PERCHIP option is set
*
* Create a bad block table by scanning the device for the given good/bad block
* identify pattern.
*/
-static int create_bbt(struct mtd_info *mtd, uint8_t *buf,
- struct nand_bbt_descr *bd, int chip)
+static int create_bbt(struct nand_bbt *bbt, uint8_t *buf, int chip)
{
- struct nand_chip *this = mtd->priv;
- int i, numblocks, numpages;
- int startblock;
+ struct mtd_info *mtd = bbt->mtd;
+ int i, startblock, numblocks;
loff_t from;

pr_info("Scanning device for bad blocks\n");

- if (bd->options & NAND_BBT_SCAN2NDPAGE)
- numpages = 2;
- else
- numpages = 1;
-
if (chip == -1) {
- numblocks = mtd->size >> this->bbt_erase_shift;
+ numblocks = mtd->size >> bbt->bbt_erase_shift;
startblock = 0;
from = 0;
} else {
- if (chip >= this->numchips) {
+ if (chip >= bbt->numchips) {
pr_warn("create_bbt(): chipnr (%d) > available chips (%d)\n",
- chip + 1, this->numchips);
+ chip + 1, bbt->numchips);
return -EINVAL;
}
- numblocks = this->chipsize >> this->bbt_erase_shift;
+ numblocks = bbt->chipsize >> bbt->bbt_erase_shift;
startblock = chip * numblocks;
numblocks += startblock;
- from = (loff_t)startblock << this->bbt_erase_shift;
+ from = (loff_t)startblock << bbt->bbt_erase_shift;
}

- if (this->bbt_options & NAND_BBT_SCANLASTPAGE)
- from += mtd->erasesize - (mtd->writesize * numpages);
-
for (i = startblock; i < numblocks; i++) {
int ret;

- BUG_ON(bd->options & NAND_BBT_NO_OOB);
-
- ret = scan_block_fast(mtd, bd, from, buf, numpages);
+ ret = bbt->is_bad_bbm(mtd, from);
if (ret < 0)
return ret;

if (ret) {
- bbt_mark_entry(this, i, BBT_BLOCK_FACTORY_BAD);
+ bbt_mark_entry(bbt, i, BBT_BLOCK_FACTORY_BAD);
pr_warn("Bad eraseblock %d at 0x%012llx\n",
i, (unsigned long long)from);
mtd->ecc_stats.badblocks++;
}

- from += (1 << this->bbt_erase_shift);
+ from += (1 << bbt->bbt_erase_shift);
}
return 0;
}

/**
* search_bbt - [GENERIC] scan the device for a specific bad block table
- * @mtd: MTD device structure
+ * @bbt: NAND BBT structure
* @buf: temporary buffer
* @td: descriptor for the bad block table
*
@@ -523,18 +463,18 @@ static int create_bbt(struct mtd_info *mtd, uint8_t *buf,
*
* The bbt ident pattern resides in the oob area of the first page in a block.
*/
-static int search_bbt(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *td)
+static int search_bbt(struct nand_bbt *bbt, uint8_t *buf, struct nand_bbt_descr *td)
{
- struct nand_chip *this = mtd->priv;
+ struct mtd_info *mtd = bbt->mtd;
int i, chips;
int startblock, block, dir;
int scanlen = mtd->writesize + mtd->oobsize;
int bbtblocks;
- int blocktopage = this->bbt_erase_shift - this->page_shift;
+ int blocktopage = bbt->bbt_erase_shift - bbt->page_shift;

/* Search direction top -> down? */
if (td->options & NAND_BBT_LASTBLOCK) {
- startblock = (mtd->size >> this->bbt_erase_shift) - 1;
+ startblock = (mtd->size >> bbt->bbt_erase_shift) - 1;
dir = -1;
} else {
startblock = 0;
@@ -543,12 +483,12 @@ static int search_bbt(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr

/* Do we have a bbt per chip? */
if (td->options & NAND_BBT_PERCHIP) {
- chips = this->numchips;
- bbtblocks = this->chipsize >> this->bbt_erase_shift;
+ chips = bbt->numchips;
+ bbtblocks = bbt->chipsize >> bbt->bbt_erase_shift;
startblock &= bbtblocks - 1;
} else {
chips = 1;
- bbtblocks = mtd->size >> this->bbt_erase_shift;
+ bbtblocks = mtd->size >> bbt->bbt_erase_shift;
}

for (i = 0; i < chips; i++) {
@@ -559,20 +499,20 @@ static int search_bbt(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr
for (block = 0; block < td->maxblocks; block++) {

int actblock = startblock + dir * block;
- loff_t offs = (loff_t)actblock << this->bbt_erase_shift;
+ loff_t offs = (loff_t)actblock << bbt->bbt_erase_shift;

/* Read first page */
- scan_read(mtd, buf, offs, mtd->writesize, td);
+ scan_read(bbt, buf, offs, mtd->writesize, td);
if (!check_pattern(buf, scanlen, mtd->writesize, td)) {
td->pages[i] = actblock << blocktopage;
if (td->options & NAND_BBT_VERSION) {
- offs = bbt_get_ver_offs(mtd, td);
+ offs = bbt_get_ver_offs(bbt, td);
td->version[i] = buf[offs];
}
break;
}
}
- startblock += this->chipsize >> this->bbt_erase_shift;
+ startblock += bbt->chipsize >> bbt->bbt_erase_shift;
}
/* Check, if we found a bbt for each requested chip */
for (i = 0; i < chips; i++) {
@@ -587,28 +527,28 @@ static int search_bbt(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr

/**
* search_read_bbts - [GENERIC] scan the device for bad block table(s)
- * @mtd: MTD device structure
+ * @bbt: NAND BBT structure
* @buf: temporary buffer
* @td: descriptor for the bad block table
* @md: descriptor for the bad block table mirror
*
* Search and read the bad block table(s).
*/
-static void search_read_bbts(struct mtd_info *mtd, uint8_t *buf,
+static void search_read_bbts(struct nand_bbt *bbt, uint8_t *buf,
struct nand_bbt_descr *td,
struct nand_bbt_descr *md)
{
/* Search the primary table */
- search_bbt(mtd, buf, td);
+ search_bbt(bbt, buf, td);

/* Search the mirror table */
if (md)
- search_bbt(mtd, buf, md);
+ search_bbt(bbt, buf, md);
}

/**
* write_bbt - [GENERIC] (Re)write the bad block table
- * @mtd: MTD device structure
+ * @bbt: NAND BBT structure
* @buf: temporary buffer
* @td: descriptor for the bad block table
* @md: descriptor for the bad block table mirror
@@ -616,12 +556,11 @@ static void search_read_bbts(struct mtd_info *mtd, uint8_t *buf,
*
* (Re)write the bad block table.
*/
-static int write_bbt(struct mtd_info *mtd, uint8_t *buf,
+static int write_bbt(struct nand_bbt *bbt, uint8_t *buf,
struct nand_bbt_descr *td, struct nand_bbt_descr *md,
int chipsel)
{
- struct nand_chip *this = mtd->priv;
- struct erase_info einfo;
+ struct mtd_info *mtd = bbt->mtd;
int i, res, chip = 0;
int bits, startblock, dir, page, offs, numblocks, sft, sftmsk;
int nrchips, pageoffs, ooboffs;
@@ -640,16 +579,16 @@ static int write_bbt(struct mtd_info *mtd, uint8_t *buf,
rcode = 0xff;
/* Write bad block table per chip rather than per device? */
if (td->options & NAND_BBT_PERCHIP) {
- numblocks = (int)(this->chipsize >> this->bbt_erase_shift);
+ numblocks = (int)(bbt->chipsize >> bbt->bbt_erase_shift);
/* Full device write or specific chip? */
if (chipsel == -1) {
- nrchips = this->numchips;
+ nrchips = bbt->numchips;
} else {
nrchips = chipsel + 1;
chip = chipsel;
}
} else {
- numblocks = (int)(mtd->size >> this->bbt_erase_shift);
+ numblocks = (int)(mtd->size >> bbt->bbt_erase_shift);
nrchips = 1;
}

@@ -680,13 +619,13 @@ static int write_bbt(struct mtd_info *mtd, uint8_t *buf,
for (i = 0; i < td->maxblocks; i++) {
int block = startblock + dir * i;
/* Check, if the block is bad */
- switch (bbt_get_entry(this, block)) {
+ switch (bbt_get_entry(bbt, block)) {
case BBT_BLOCK_WORN:
case BBT_BLOCK_FACTORY_BAD:
continue;
}
page = block <<
- (this->bbt_erase_shift - this->page_shift);
+ (bbt->bbt_erase_shift - bbt->page_shift);
/* Check, if the block is used by the mirror table */
if (!md || md->pages[chip] != page)
goto write;
@@ -714,13 +653,13 @@ static int write_bbt(struct mtd_info *mtd, uint8_t *buf,
default: return -EINVAL;
}

- to = ((loff_t)page) << this->page_shift;
+ to = ((loff_t)page) << bbt->page_shift;

/* Must we save the block contents? */
if (td->options & NAND_BBT_SAVECONTENT) {
/* Make it block aligned */
- to &= ~((loff_t)((1 << this->bbt_erase_shift) - 1));
- len = 1 << this->bbt_erase_shift;
+ to &= ~((loff_t)((1 << bbt->bbt_erase_shift) - 1));
+ len = 1 << bbt->bbt_erase_shift;
res = mtd_read(mtd, to, len, &retlen, buf);
if (res < 0) {
if (retlen != len) {
@@ -730,15 +669,15 @@ static int write_bbt(struct mtd_info *mtd, uint8_t *buf,
pr_warn("nand_bbt: ECC error while reading block for writing bad block table\n");
}
/* Read oob data */
- ops.ooblen = (len >> this->page_shift) * mtd->oobsize;
+ ops.ooblen = (len >> bbt->page_shift) * mtd->oobsize;
ops.oobbuf = &buf[len];
res = mtd_read_oob(mtd, to + mtd->writesize, &ops);
if (res < 0 || ops.oobretlen != ops.ooblen)
goto outerr;

/* Calc the byte offset in the buffer */
- pageoffs = page - (int)(to >> this->page_shift);
- offs = pageoffs << this->page_shift;
+ pageoffs = page - (int)(to >> bbt->page_shift);
+ offs = pageoffs << bbt->page_shift;
/* Preset the bbt area with 0xff */
memset(&buf[offs], 0xff, (size_t)(numblocks >> sft));
ooboffs = len + (pageoffs * mtd->oobsize);
@@ -765,7 +704,7 @@ static int write_bbt(struct mtd_info *mtd, uint8_t *buf,
len = ALIGN(len, mtd->writesize);
/* Preset the buffer with 0xff */
memset(buf, 0xff, len +
- (len >> this->page_shift)* mtd->oobsize);
+ (len >> bbt->page_shift) * mtd->oobsize);
offs = 0;
ooboffs = len;
/* Pattern is located in oob area of first page */
@@ -779,16 +718,12 @@ static int write_bbt(struct mtd_info *mtd, uint8_t *buf,
for (i = 0; i < numblocks; i++) {
uint8_t dat;
int sftcnt = (i << (3 - sft)) & sftmsk;
- dat = bbt_get_entry(this, chip * numblocks + i);
+ dat = bbt_get_entry(bbt, chip * numblocks + i);
/* Do not store the reserved bbt blocks! */
buf[offs + (i >> sft)] &= ~(msk[dat] << sftcnt);
}

- memset(&einfo, 0, sizeof(einfo));
- einfo.mtd = mtd;
- einfo.addr = to;
- einfo.len = 1 << this->bbt_erase_shift;
- res = nand_erase_nand(mtd, &einfo, 1);
+ res = bbt->erase(mtd, to);
if (res < 0)
goto outerr;

@@ -813,41 +748,36 @@ static int write_bbt(struct mtd_info *mtd, uint8_t *buf,

/**
* nand_memory_bbt - [GENERIC] create a memory based bad block table
- * @mtd: MTD device structure
- * @bd: descriptor for the good/bad block search pattern
+ * @bbt: NAND BBT structure
*
* The function creates a memory based bbt by scanning the device for
* manufacturer / software marked good / bad blocks.
*/
-static inline int nand_memory_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd)
+static inline int nand_memory_bbt(struct nand_bbt *bbt)
{
- struct nand_chip *this = mtd->priv;
-
- return create_bbt(mtd, this->buffers->databuf, bd, -1);
+ return create_bbt(bbt, NULL /* FIXME: this->buffers->databuf */, -1);
}

/**
* check_create - [GENERIC] create and write bbt(s) if necessary
- * @mtd: MTD device structure
+ * @bbt: NAND BBT structure
* @buf: temporary buffer
- * @bd: descriptor for the good/bad block search pattern
*
* The function checks the results of the previous call to read_bbt and creates
* / updates the bbt(s) if necessary. Creation is necessary if no bbt was found
* for the chip/device. Update is necessary if one of the tables is missing or
* the version nr. of one table is less than the other.
*/
-static int check_create(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *bd)
+static int check_create(struct nand_bbt *bbt, uint8_t *buf)
{
int i, chips, writeops, create, chipsel, res, res2;
- struct nand_chip *this = mtd->priv;
- struct nand_bbt_descr *td = this->bbt_td;
- struct nand_bbt_descr *md = this->bbt_md;
+ struct nand_bbt_descr *td = bbt->bbt_td;
+ struct nand_bbt_descr *md = bbt->bbt_md;
struct nand_bbt_descr *rd, *rd2;

/* Do we have a bbt per chip? */
if (td->options & NAND_BBT_PERCHIP)
- chips = this->numchips;
+ chips = bbt->numchips;
else
chips = 1;

@@ -896,8 +826,8 @@ static int check_create(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_desc
continue;

/* Create the table in memory by scanning the chip(s) */
- if (!(this->bbt_options & NAND_BBT_CREATE_EMPTY))
- create_bbt(mtd, buf, bd, chipsel);
+ if (!(bbt->bbt_options & NAND_BBT_CREATE_EMPTY))
+ create_bbt(bbt, buf, chipsel);

td->version[i] = 1;
if (md)
@@ -906,7 +836,7 @@ static int check_create(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_desc

/* Read back first? */
if (rd) {
- res = read_abs_bbt(mtd, buf, rd, chipsel);
+ res = read_abs_bbt(bbt, buf, rd, chipsel);
if (mtd_is_eccerr(res)) {
/* Mark table as invalid */
rd->pages[i] = -1;
@@ -917,7 +847,7 @@ static int check_create(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_desc
}
/* If they weren't versioned, read both */
if (rd2) {
- res2 = read_abs_bbt(mtd, buf, rd2, chipsel);
+ res2 = read_abs_bbt(bbt, buf, rd2, chipsel);
if (mtd_is_eccerr(res2)) {
/* Mark table as invalid */
rd2->pages[i] = -1;
@@ -939,14 +869,14 @@ static int check_create(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_desc

/* Write the bad block table to the device? */
if ((writeops & 0x01) && (td->options & NAND_BBT_WRITE)) {
- res = write_bbt(mtd, buf, td, md, chipsel);
+ res = write_bbt(bbt, buf, td, md, chipsel);
if (res < 0)
return res;
}

/* Write the mirror bad block table to the device? */
if ((writeops & 0x02) && md && (md->options & NAND_BBT_WRITE)) {
- res = write_bbt(mtd, buf, md, td, chipsel);
+ res = write_bbt(bbt, buf, md, td, chipsel);
if (res < 0)
return res;
}
@@ -956,25 +886,25 @@ static int check_create(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_desc

/**
* mark_bbt_regions - [GENERIC] mark the bad block table regions
- * @mtd: MTD device structure
+ * @bbt: NAND BBT structure
* @td: bad block table descriptor
*
* The bad block table regions are marked as "bad" to prevent accidental
* erasures / writes. The regions are identified by the mark 0x02.
*/
-static void mark_bbt_region(struct mtd_info *mtd, struct nand_bbt_descr *td)
+static void mark_bbt_region(struct nand_bbt *bbt, struct nand_bbt_descr *td)
{
- struct nand_chip *this = mtd->priv;
+ struct mtd_info *mtd = bbt->mtd;
int i, j, chips, block, nrblocks, update;
uint8_t oldval;

/* Do we have a bbt per chip? */
if (td->options & NAND_BBT_PERCHIP) {
- chips = this->numchips;
- nrblocks = (int)(this->chipsize >> this->bbt_erase_shift);
+ chips = bbt->numchips;
+ nrblocks = (int)(bbt->chipsize >> bbt->bbt_erase_shift);
} else {
chips = 1;
- nrblocks = (int)(mtd->size >> this->bbt_erase_shift);
+ nrblocks = (int)(mtd->size >> bbt->bbt_erase_shift);
}

for (i = 0; i < chips; i++) {
@@ -982,13 +912,13 @@ static void mark_bbt_region(struct mtd_info *mtd, struct nand_bbt_descr *td)
!(td->options & NAND_BBT_WRITE)) {
if (td->pages[i] == -1)
continue;
- block = td->pages[i] >> (this->bbt_erase_shift - this->page_shift);
- oldval = bbt_get_entry(this, block);
- bbt_mark_entry(this, block, BBT_BLOCK_RESERVED);
+ block = td->pages[i] >> (bbt->bbt_erase_shift - bbt->page_shift);
+ oldval = bbt_get_entry(bbt, block);
+ bbt_mark_entry(bbt, block, BBT_BLOCK_RESERVED);
if ((oldval != BBT_BLOCK_RESERVED) &&
td->reserved_block_code)
- nand_update_bbt(mtd, (loff_t)block <<
- this->bbt_erase_shift);
+ nand_update_bbt(bbt, (loff_t)block <<
+ bbt->bbt_erase_shift);
continue;
}
update = 0;
@@ -997,8 +927,8 @@ static void mark_bbt_region(struct mtd_info *mtd, struct nand_bbt_descr *td)
else
block = i * nrblocks;
for (j = 0; j < td->maxblocks; j++) {
- oldval = bbt_get_entry(this, block);
- bbt_mark_entry(this, block, BBT_BLOCK_RESERVED);
+ oldval = bbt_get_entry(bbt, block);
+ bbt_mark_entry(bbt, block, BBT_BLOCK_RESERVED);
if (oldval != BBT_BLOCK_RESERVED)
update = 1;
block++;
@@ -1009,22 +939,22 @@ static void mark_bbt_region(struct mtd_info *mtd, struct nand_bbt_descr *td)
* bbts. This should only happen once.
*/
if (update && td->reserved_block_code)
- nand_update_bbt(mtd, (loff_t)(block - 1) <<
- this->bbt_erase_shift);
+ nand_update_bbt(bbt, (loff_t)(block - 1) <<
+ bbt->bbt_erase_shift);
}
}

/**
* verify_bbt_descr - verify the bad block description
- * @mtd: MTD device structure
+ * @bbt: NAND BBT structure
* @bd: the table to verify
*
* This functions performs a few sanity checks on the bad block description
* table.
*/
-static void verify_bbt_descr(struct mtd_info *mtd, struct nand_bbt_descr *bd)
+static void verify_bbt_descr(struct nand_bbt *bbt, struct nand_bbt_descr *bd)
{
- struct nand_chip *this = mtd->priv;
+ struct mtd_info *mtd = bbt->mtd;
u32 pattern_len;
u32 bits;
u32 table_size;
@@ -1035,16 +965,16 @@ static void verify_bbt_descr(struct mtd_info *mtd, struct nand_bbt_descr *bd)
pattern_len = bd->len;
bits = bd->options & NAND_BBT_NRBITS_MSK;

- BUG_ON((this->bbt_options & NAND_BBT_NO_OOB) &&
- !(this->bbt_options & NAND_BBT_USE_FLASH));
+ BUG_ON((bbt->bbt_options & NAND_BBT_NO_OOB) &&
+ !(bbt->bbt_options & NAND_BBT_USE_FLASH));
BUG_ON(!bits);

if (bd->options & NAND_BBT_VERSION)
pattern_len++;

if (bd->options & NAND_BBT_NO_OOB) {
- BUG_ON(!(this->bbt_options & NAND_BBT_USE_FLASH));
- BUG_ON(!(this->bbt_options & NAND_BBT_NO_OOB));
+ BUG_ON(!(bbt->bbt_options & NAND_BBT_USE_FLASH));
+ BUG_ON(!(bbt->bbt_options & NAND_BBT_NO_OOB));
BUG_ON(bd->offs);
if (bd->options & NAND_BBT_VERSION)
BUG_ON(bd->veroffs != bd->len);
@@ -1052,20 +982,19 @@ static void verify_bbt_descr(struct mtd_info *mtd, struct nand_bbt_descr *bd)
}

if (bd->options & NAND_BBT_PERCHIP)
- table_size = this->chipsize >> this->bbt_erase_shift;
+ table_size = bbt->chipsize >> bbt->bbt_erase_shift;
else
- table_size = mtd->size >> this->bbt_erase_shift;
+ table_size = mtd->size >> bbt->bbt_erase_shift;
table_size >>= 3;
table_size *= bits;
if (bd->options & NAND_BBT_NO_OOB)
table_size += pattern_len;
- BUG_ON(table_size > (1 << this->bbt_erase_shift));
+ BUG_ON(table_size > (1 << bbt->bbt_erase_shift));
}

/**
* nand_scan_bbt - [NAND Interface] scan, find, read and maybe create bad block table(s)
- * @mtd: MTD device structure
- * @bd: descriptor for the good/bad block search pattern
+ * @bbt: NAND BBT structure
*
* The function checks, if a bad block table(s) is/are already available. If
* not it scans the device for manufacturer marked good / bad blocks and writes
@@ -1074,21 +1003,21 @@ static void verify_bbt_descr(struct mtd_info *mtd, struct nand_bbt_descr *bd)
* The bad block table memory is allocated here. It must be freed by calling
* the nand_free_bbt function.
*/
-static int nand_scan_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd)
+static int nand_scan_bbt(struct nand_bbt *bbt)
{
- struct nand_chip *this = mtd->priv;
+ struct mtd_info *mtd = bbt->mtd;
int len, res;
uint8_t *buf;
- struct nand_bbt_descr *td = this->bbt_td;
- struct nand_bbt_descr *md = this->bbt_md;
+ struct nand_bbt_descr *td = bbt->bbt_td;
+ struct nand_bbt_descr *md = bbt->bbt_md;

- len = mtd->size >> (this->bbt_erase_shift + 2);
+ len = mtd->size >> (bbt->bbt_erase_shift + 2);
/*
* Allocate memory (2bit per block) and clear the memory bad block
* table.
*/
- this->bbt = kzalloc(len, GFP_KERNEL);
- if (!this->bbt)
+ bbt->bbt = kzalloc(len, GFP_KERNEL);
+ if (!bbt->bbt)
return -ENOMEM;

/*
@@ -1096,18 +1025,18 @@ static int nand_scan_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd)
* memory based bad block table.
*/
if (!td) {
- if ((res = nand_memory_bbt(mtd, bd))) {
+ if ((res = nand_memory_bbt(bbt))) {
pr_err("nand_bbt: can't scan flash and build the RAM-based BBT\n");
goto err;
}
return 0;
}
- verify_bbt_descr(mtd, td);
- verify_bbt_descr(mtd, md);
+ verify_bbt_descr(bbt, td);
+ verify_bbt_descr(bbt, md);

/* Allocate a temporary buffer for one eraseblock incl. oob */
- len = (1 << this->bbt_erase_shift);
- len += (len >> this->page_shift) * mtd->oobsize;
+ len = (1 << bbt->bbt_erase_shift);
+ len += (len >> bbt->page_shift) * mtd->oobsize;
buf = vmalloc(len);
if (!buf) {
res = -ENOMEM;
@@ -1116,59 +1045,59 @@ static int nand_scan_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd)

/* Is the bbt at a given page? */
if (td->options & NAND_BBT_ABSPAGE) {
- read_abs_bbts(mtd, buf, td, md);
+ read_abs_bbts(bbt, buf, td, md);
} else {
/* Search the bad block table using a pattern in oob */
- search_read_bbts(mtd, buf, td, md);
+ search_read_bbts(bbt, buf, td, md);
}

- res = check_create(mtd, buf, bd);
+ res = check_create(bbt, buf);
if (res)
goto err;

/* Prevent the bbt regions from erasing / writing */
- mark_bbt_region(mtd, td);
+ mark_bbt_region(bbt, td);
if (md)
- mark_bbt_region(mtd, md);
+ mark_bbt_region(bbt, md);

vfree(buf);
return 0;

err:
- kfree(this->bbt);
- this->bbt = NULL;
+ kfree(bbt->bbt);
+ bbt->bbt = NULL;
return res;
}

/**
* nand_update_bbt - update bad block table(s)
- * @mtd: MTD device structure
+ * @bbt: NAND BBT structure
* @offs: the offset of the newly marked block
*
* The function updates the bad block table(s).
*/
-static int nand_update_bbt(struct mtd_info *mtd, loff_t offs)
+static int nand_update_bbt(struct nand_bbt *bbt, loff_t offs)
{
- struct nand_chip *this = mtd->priv;
+ struct mtd_info *mtd = bbt->mtd;
int len, res = 0;
int chip, chipsel;
uint8_t *buf;
- struct nand_bbt_descr *td = this->bbt_td;
- struct nand_bbt_descr *md = this->bbt_md;
+ struct nand_bbt_descr *td = bbt->bbt_td;
+ struct nand_bbt_descr *md = bbt->bbt_md;

- if (!this->bbt || !td)
+ if (!bbt->bbt || !td)
return -EINVAL;

/* Allocate a temporary buffer for one eraseblock incl. oob */
- len = (1 << this->bbt_erase_shift);
- len += (len >> this->page_shift) * mtd->oobsize;
+ len = (1 << bbt->bbt_erase_shift);
+ len += (len >> bbt->page_shift) * mtd->oobsize;
buf = kmalloc(len, GFP_KERNEL);
if (!buf)
return -ENOMEM;

/* Do we have a bbt per chip? */
if (td->options & NAND_BBT_PERCHIP) {
- chip = (int)(offs >> this->chip_shift);
+ chip = (int)(offs >> bbt->chip_shift);
chipsel = chip;
} else {
chip = 0;
@@ -1181,13 +1110,13 @@ static int nand_update_bbt(struct mtd_info *mtd, loff_t offs)

/* Write the bad block table to the device? */
if (td->options & NAND_BBT_WRITE) {
- res = write_bbt(mtd, buf, td, md, chipsel);
+ res = write_bbt(bbt, buf, td, md, chipsel);
if (res < 0)
goto out;
}
/* Write the mirror bad block table to the device? */
if (md && (md->options & NAND_BBT_WRITE)) {
- res = write_bbt(mtd, buf, md, td, chipsel);
+ res = write_bbt(bbt, buf, md, td, chipsel);
}

out:
@@ -1195,12 +1124,6 @@ static int nand_update_bbt(struct mtd_info *mtd, loff_t offs)
return res;
}

-/*
- * Define some generic bad / good block scan pattern which are used
- * while scanning a device for factory marked good / bad blocks.
- */
-static uint8_t scan_ff_pattern[] = { 0xff, 0xff };
-
/* Generic flash bbt descriptors */
static uint8_t bbt_pattern[] = {'B', 'b', 't', '0' };
static uint8_t mirror_pattern[] = {'1', 't', 'b', 'B' };
@@ -1245,135 +1168,103 @@ static struct nand_bbt_descr bbt_mirror_no_oob_descr = {
.pattern = mirror_pattern
};

-#define BADBLOCK_SCAN_MASK (~NAND_BBT_NO_OOB)
/**
- * nand_create_badblock_pattern - [INTERN] Creates a BBT descriptor structure
- * @this: NAND chip to create descriptor for
+ * nand_bbt_init - [NAND Interface] Initialize and locate/create a bad block
+ * table
*
- * This function allocates and initializes a nand_bbt_descr for BBM detection
- * based on the properties of @this. The new descriptor is stored in
- * this->badblock_pattern. Thus, this->badblock_pattern should be NULL when
- * passed to this function.
- */
-static int nand_create_badblock_pattern(struct nand_chip *this)
-{
- struct nand_bbt_descr *bd;
- if (this->badblock_pattern) {
- pr_warn("Bad block pattern already allocated; not replacing\n");
- return -EINVAL;
- }
- bd = kzalloc(sizeof(*bd), GFP_KERNEL);
- if (!bd)
- return -ENOMEM;
- bd->options = this->bbt_options & BADBLOCK_SCAN_MASK;
- bd->offs = this->badblockpos;
- bd->len = (this->options & NAND_BUSWIDTH_16) ? 2 : 1;
- bd->pattern = scan_ff_pattern;
- bd->options |= NAND_BBT_DYNAMICSTRUCT;
- this->badblock_pattern = bd;
- return 0;
-}
-
-/**
- * nand_default_bbt - [NAND Interface] Select a default bad block table for the device
- * @mtd: MTD device structure
+ * @bbt: NAND BBT structure
*
* This function selects the default bad block table support for the device and
- * calls the nand_scan_bbt function.
+ * scans for an existing table, or else creates one.
*/
-int nand_default_bbt(struct mtd_info *mtd)
+int nand_bbt_init(struct nand_bbt *bbt)
{
- struct nand_chip *this = mtd->priv;
- int ret;
-
/* Is a flash based bad block table requested? */
- if (this->bbt_options & NAND_BBT_USE_FLASH) {
+ if (bbt->bbt_options & NAND_BBT_USE_FLASH) {
/* Use the default pattern descriptors */
- if (!this->bbt_td) {
- if (this->bbt_options & NAND_BBT_NO_OOB) {
- this->bbt_td = &bbt_main_no_oob_descr;
- this->bbt_md = &bbt_mirror_no_oob_descr;
+ if (!bbt->bbt_td) {
+ if (bbt->bbt_options & NAND_BBT_NO_OOB) {
+ bbt->bbt_td = &bbt_main_no_oob_descr;
+ bbt->bbt_md = &bbt_mirror_no_oob_descr;
} else {
- this->bbt_td = &bbt_main_descr;
- this->bbt_md = &bbt_mirror_descr;
+ bbt->bbt_td = &bbt_main_descr;
+ bbt->bbt_md = &bbt_mirror_descr;
}
}
} else {
- this->bbt_td = NULL;
- this->bbt_md = NULL;
+ bbt->bbt_td = NULL;
+ bbt->bbt_md = NULL;
}

- if (!this->badblock_pattern) {
- ret = nand_create_badblock_pattern(this);
- if (ret)
- return ret;
- }
+ return nand_scan_bbt(bbt);
+}
+EXPORT_SYMBOL(nand_bbt_init);

- return nand_scan_bbt(mtd, this->badblock_pattern);
+void nand_bbt_release(struct nand_bbt *bbt)
+{
+ kfree(bbt->bbt);
}
+EXPORT_SYMBOL(nand_bbt_release);

/**
- * nand_isreserved_bbt - [NAND Interface] Check if a block is reserved
- * @mtd: MTD device structure
+ * nand_bbt_isreserved - [NAND Interface] Check if a block is reserved
+ * @bbt: NAND BBT structure
* @offs: offset in the device
*/
-int nand_isreserved_bbt(struct mtd_info *mtd, loff_t offs)
+int nand_bbt_isreserved(struct nand_bbt *bbt, loff_t offs)
{
- struct nand_chip *this = mtd->priv;
int block;

- block = (int)(offs >> this->bbt_erase_shift);
- return bbt_get_entry(this, block) == BBT_BLOCK_RESERVED;
+ block = (int)(offs >> bbt->bbt_erase_shift);
+ return bbt_get_entry(bbt, block) == BBT_BLOCK_RESERVED;
}
+EXPORT_SYMBOL(nand_bbt_isreserved);

/**
- * nand_isbad_bbt - [NAND Interface] Check if a block is bad
- * @mtd: MTD device structure
+ * nand_bbt_isbad - [NAND Interface] Check if a block is bad
+ * @bbt: NAND BBT structure
* @offs: offset in the device
- * @allowbbt: allow access to bad block table region
*/
-int nand_isbad_bbt(struct mtd_info *mtd, loff_t offs, int allowbbt)
+int nand_bbt_isbad(struct nand_bbt *bbt, loff_t offs)
{
- struct nand_chip *this = mtd->priv;
int block, res;

- block = (int)(offs >> this->bbt_erase_shift);
- res = bbt_get_entry(this, block);
+ block = (int)(offs >> bbt->bbt_erase_shift);
+ res = bbt_get_entry(bbt, block);

- pr_debug("nand_isbad_bbt(): bbt info for offs 0x%08x: (block %d) 0x%02x\n",
+ pr_debug("nand_bbt_isbad(): bbt info for offs 0x%08x: (block %d) 0x%02x\n",
(unsigned int)offs, block, res);

switch (res) {
case BBT_BLOCK_GOOD:
+ case BBT_BLOCK_RESERVED:
return 0;
case BBT_BLOCK_WORN:
+ case BBT_BLOCK_FACTORY_BAD:
+ default:
return 1;
- case BBT_BLOCK_RESERVED:
- return allowbbt ? 0 : 1;
}
- return 1;
}
+EXPORT_SYMBOL(nand_bbt_isbad);

/**
- * nand_markbad_bbt - [NAND Interface] Mark a block bad in the BBT
- * @mtd: MTD device structure
+ * nand_bbt_markbad - [NAND Interface] Mark a block bad in the BBT
+ * @bbt: NAND BBT structure
* @offs: offset of the bad block
*/
-int nand_markbad_bbt(struct mtd_info *mtd, loff_t offs)
+int nand_bbt_markbad(struct nand_bbt *bbt, loff_t offs)
{
- struct nand_chip *this = mtd->priv;
int block, ret = 0;

- block = (int)(offs >> this->bbt_erase_shift);
+ block = (int)(offs >> bbt->bbt_erase_shift);

/* Mark bad block in memory */
- bbt_mark_entry(this, block, BBT_BLOCK_WORN);
+ bbt_mark_entry(bbt, block, BBT_BLOCK_WORN);

/* Update flash-based bad block table */
- if (this->bbt_options & NAND_BBT_USE_FLASH)
- ret = nand_update_bbt(mtd, offs);
+ if (bbt->bbt_options & NAND_BBT_USE_FLASH)
+ ret = nand_update_bbt(bbt, offs);

return ret;
}
-
-EXPORT_SYMBOL(nand_scan_bbt);
+EXPORT_SYMBOL(nand_bbt_markbad);
diff --git a/include/linux/mtd/bbm.h b/include/linux/mtd/bbm.h
index 36bb6a5..4b428b6 100644
--- a/include/linux/mtd/bbm.h
+++ b/include/linux/mtd/bbm.h
@@ -28,44 +28,11 @@
#ifndef __LINUX_MTD_BBM_H
#define __LINUX_MTD_BBM_H

+#include <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 */
@@ -115,13 +82,6 @@ struct nand_bbt_descr {
*/
#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

diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
index 6c51876..539c9bf 100644
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -711,6 +711,7 @@ struct nand_chip {
struct nand_buffers *buffers;
struct nand_hw_control hwcontrol;

+ struct nand_bbt *nand_bbt;
uint8_t *bbt;
struct nand_bbt_descr *bbt_td;
struct nand_bbt_descr *bbt_md;
@@ -833,12 +834,9 @@ struct nand_manufacturers {
extern struct nand_flash_dev nand_flash_ids[];
extern struct nand_manufacturers nand_manuf_ids[];

-extern int nand_default_bbt(struct mtd_info *mtd);
extern int nand_markbad_bbt(struct mtd_info *mtd, loff_t offs);
extern int nand_isreserved_bbt(struct mtd_info *mtd, loff_t offs);
extern int nand_isbad_bbt(struct mtd_info *mtd, loff_t offs, int allowbbt);
-extern int nand_erase_nand(struct mtd_info *mtd, struct erase_info *instr,
- int allowbbt);
extern int nand_do_read(struct mtd_info *mtd, loff_t from, size_t len,
size_t *retlen, uint8_t *buf);

diff --git a/include/linux/mtd/nand_bbt.h b/include/linux/mtd/nand_bbt.h
new file mode 100644
index 0000000..f776695
--- /dev/null
+++ b/include/linux/mtd/nand_bbt.h
@@ -0,0 +1,160 @@
+/*
+ * NAND family Bad Block Table support
+ *
+ * Copyright ? 2015 Broadcom Corporation
+ * Brian Norris <computersforpeace@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
+
+struct mtd_info;
+
+/* 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 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
+
+/* The maximum number of blocks to scan for a bbt */
+#define NAND_BBT_SCAN_MAXBLOCKS 4
+
+struct nand_bbt {
+ struct mtd_info *mtd;
+
+ /*
+ * This is important to abstract out of nand_bbt.c and provide
+ * separately in nand_base.c and spi-nand-base.c -- it's sort of
+ * duplicated in nand_block_bad() (nand_base) and
+ * scan_block_fast() (nand_bbt) right now
+ *
+ * Note that this also means nand_chip.badblock_pattern should
+ * be removed from nand_bbt.c
+ */
+ int (*is_bad_bbm)(struct mtd_info *mtd, loff_t ofs);
+
+ /* Only required if the driver wants to attempt to program new
+ * bad block markers that imitate the factory-marked BBMs */
+ int (*mark_bad_bbm)(struct mtd_info *mtd, loff_t ofs);
+
+ /* Erase a block, bypassing reserved checks */
+ int (*erase)(struct mtd_info *mtd, loff_t ofs);
+
+ unsigned int bbt_options;
+
+ /* Only required for NAND_BBT_PERCHIP */
+ int numchips;
+
+ /* Discourage new customer usages here; suggest usage of the
+ * relevant NAND_BBT_* options instead */
+ struct nand_bbt_descr *bbt_td;
+ struct nand_bbt_descr *bbt_md;
+
+ /* The rest are filled in by nand_bbt_init() */
+
+ u64 chipsize;
+ int chip_shift;
+ int bbt_erase_shift;
+ int page_shift;
+
+ u8 *bbt;
+};
+
+int nand_bbt_init(struct nand_bbt *bbt);
+void nand_bbt_release(struct nand_bbt *bbt);
+int nand_bbt_markbad(struct nand_bbt *bbt, loff_t offs);
+int nand_bbt_isreserved(struct nand_bbt *bbt, loff_t offs);
+int nand_bbt_isbad(struct nand_bbt *bbt, loff_t offs);
+
+#endif /* __LINUX_MTD_NAND_BBT_H */
--
1.9.1
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