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Subject[RFC 31/47] mtd: nand: stm_nand_bch: scan block for BBM(s) according to specified BBT options
Date
Search the specified (first and, second or last) page in a block for
the BBT. Support Hamming or Advanced Flex Mode (AFM) BBMs too.

Signed-off-by: Lee Jones <lee.jones@linaro.org>
---
drivers/mtd/nand/stm_nand_bch.c | 62 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 62 insertions(+)

diff --git a/drivers/mtd/nand/stm_nand_bch.c b/drivers/mtd/nand/stm_nand_bch.c
index 4812431..29eeee8 100644
--- a/drivers/mtd/nand/stm_nand_bch.c
+++ b/drivers/mtd/nand/stm_nand_bch.c
@@ -643,6 +643,66 @@ static int bbt_is_block_bad(uint8_t *bbt, uint32_t block)
return bbt_get_block_mark(bbt, block) == BBT_MARK_GOOD ? 0 : 1;
}

+/* Scan page for BBM(s), according to specified BBT options */
+static int nandi_scan_bad_block_markers_page(struct nandi_controller *nandi,
+ uint32_t page)
+{
+ struct mtd_info *mtd = &nandi->info.mtd;
+ struct nand_chip *chip = mtd->priv;
+ uint8_t *oob_buf = nandi->oob_buf;
+ int i, e;
+
+ /* Read the OOB area */
+ flex_read_raw(nandi, page, mtd->writesize, oob_buf, mtd->oobsize);
+
+ if (oob_buf[chip->badblockpos] == 0xff)
+ return 0;
+
+ /* Tolerate 'alien' Hamming Boot Mode ECC */
+ e = 0;
+ for (i = 0; i < mtd->oobsize; i += 16)
+ e += hweight8(oob_buf[i + 3] ^ 'B');
+ if (e <= 1)
+ return 0;
+
+ /* Tolerate 'alien' Hamming AFM ECC */
+ e = 0;
+ for (i = 0; i < mtd->oobsize; i += 16) {
+ e += hweight8(oob_buf[i + 3] ^ 'A');
+ e += hweight8(oob_buf[i + 4] ^ 'F');
+ e += hweight8(oob_buf[i + 5] ^ 'M');
+ if (e <= 1)
+ return 0;
+ }
+
+ return 1;
+}
+
+/* Scan block for BBM(s), according to specified BBT options */
+static int nandi_scan_bad_block_markers_block(struct nandi_controller *nandi,
+ uint32_t block)
+
+{
+ struct mtd_info *mtd = &nandi->info.mtd;
+ struct nand_chip *chip = mtd->priv;
+ uint32_t pages_per_block = mtd->erasesize >> nandi->page_shift;
+ uint32_t page = block << (nandi->block_shift - nandi->page_shift);
+
+ if (nandi_scan_bad_block_markers_page(nandi, page))
+ return 1;
+
+ if ((chip->bbt_options & NAND_BBT_SCAN2NDPAGE) &&
+ nandi_scan_bad_block_markers_page(nandi, page + 1))
+ return 1;
+
+ if ((chip->bbt_options & NAND_BBT_SCANLASTPAGE) &&
+ nandi_scan_bad_block_markers_page(nandi,
+ page + pages_per_block - 1))
+ return 1;
+
+ return 0;
+}
+
/* Populate IBBT BCH Header */
static void bch_fill_ibbt_header(struct nandi_controller *nandi,
struct nand_ibbt_bch_header *ibbt_header,
@@ -957,6 +1017,8 @@ static void nandi_set_mtd_defaults(struct nandi_controller *nandi,
chip->priv = nandi;
chip->ecc.layout = &info->ecclayout;

+ chip->bbt_options |= NAND_BBT_USE_FLASH;
+
/* mtd_info */
mtd->owner = THIS_MODULE;
mtd->type = MTD_NANDFLASH;
--
1.8.3.2


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