mtd: nand: omap_gpmc: support flash based BBT

diff --git a/drivers/mtd/nand/omap_gpmc.c b/drivers/mtd/nand/omap_gpmc.c
index 2272bfccd604d81553a1fe4c33e83befb1ee37a2..ecf21d99de0681b23765fe3feb5299e20f1e8c95 100644 (file)
--- a/drivers/mtd/nand/omap_gpmc.c
+++ b/drivers/mtd/nand/omap_gpmc.c
@@ -27,6 +27,31 @@ static __maybe_unused struct nand_ecclayout hw_bch8_nand_oob =
 
 static struct gpmc *gpmc_cfg = (struct gpmc *)GPMC_BASE;
 
+#ifdef CONFIG_SYS_NAND_USE_FLASH_BBT
+static uint8_t bbt_pattern[] = {'B', 'b', 't', '0' };
+static uint8_t mirror_pattern[] = {'1', 't', 'b', 'B' };
+
+static struct nand_bbt_descr bbt_main_descr = {
+       .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE |
+               NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP,
+       .offs = 0, /* may be overwritten depending on ECC layout */
+       .len = 4,
+       .veroffs = 4, /* may be overwritten depending on ECC layout */
+       .maxblocks = 4,
+       .pattern = bbt_pattern,
+};
+
+static struct nand_bbt_descr bbt_mirror_descr = {
+       .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE |
+               NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP,
+       .offs = 0, /* may be overwritten depending on ECC layout */
+       .len = 4,
+       .veroffs = 4, /* may be overwritten depending on ECC layout */
+       .maxblocks = 4,
+       .pattern = mirror_pattern,
+};
+#endif
+
 /*
  * omap_nand_hwcontrol - Set the address pointers corretly for the
  *                     following address/data/command operation
@@ -945,6 +970,21 @@ int board_nand_init(struct nand_chip *nand)
        omap_hwecc_init(nand);
 #endif
 #endif
+#ifdef CONFIG_SYS_NAND_USE_FLASH_BBT
+       if (nand->ecc.layout) {
+               bbt_main_descr.offs = nand->ecc.layout->oobfree[0].offset;
+               bbt_main_descr.veroffs = bbt_main_descr.offs +
+                       sizeof(bbt_pattern);
+
+               bbt_mirror_descr.offs = nand->ecc.layout->oobfree[0].offset;
+               bbt_mirror_descr.veroffs = bbt_mirror_descr.offs +
+                       sizeof(mirror_pattern);
+       }
+
+       nand->bbt_options |= NAND_BBT_USE_FLASH;
+       nand->bbt_td = &bbt_main_descr;
+       nand->bbt_md = &bbt_mirror_descr;
+#endif
 
 #ifdef CONFIG_SPL_BUILD
        if (nand->options & NAND_BUSWIDTH_16)