mtd: support ONFI multi lun NAND

With onfi a flash is organized into one or more logical units (LUNs). A logical unit (LUN) is the minimum unit that can independently execute commands and report status.

Mtd does not exploit LUN, so make it see a big single flash where size is lun_size * number_of_lun.

Without this patch MT29F8G08ADBDAH4 size is 512MiB instead of 1GiB.

Artem: split long line on 2 shorter ones.

This is commit 637957551c0ac80de8dfc7650d320c5a98c2c0c0 from Linux

---
Rafael submitted http://patchwork.ozlabs.org/patch/168820/ to fix this, but the patch was corrupt so I picked the equivalent fix out of Linux (better to have them synced anyway).

Applied to u-boot-nand-flash.

 drivers/mtd/nand/nand_base.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

index bfd668f..50bfb65 100644
@@ -2573,7 +2573,8 @@ static int nand_flash_detect_onfi(struct mtd_info *mtd, struct nand_chip *chip,
 	mtd->writesize = le32_to_cpu(p->byte_per_page);
 	mtd->erasesize = le32_to_cpu(p->pages_per_block) * mtd->writesize;
 	mtd->oobsize = le16_to_cpu(p->spare_bytes_per_page);
-	chip->chipsize = (uint64_t)le32_to_cpu(p->blocks_per_lun) * mtd->erasesize;
+	chip->chipsize = le32_to_cpu(p->blocks_per_lun);
+	chip->chipsize *= (uint64_t)mtd->erasesize * p->lun_count;
 	*busw = 0;
 	if (le16_to_cpu(p->features) & 1)
 		*busw = NAND_BUSWIDTH_16;

1.7.9.5

Sigh, this was posted by me, not Matthieu -- I forgot to fix up the output of git format-patch before running mutt on it. Please don't reply to Matthieu (at least regarding anything U-Boot specific).

-Scott