[PATCH] support ONFI multi lun NAND

[PATCH] support ONFI multi lun NAND

[Matthieu CASTET]

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 512MB instead of 1GB.

Signed-off-by: Matthieu Castet <matthieu.castet@parrot.com>
---
 drivers/mtd/nand/nand_base.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index 8a393f9..04c1baf 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -2898,7 +2898,8 @@ 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 = (uint64_t)le32_to_cpu(p->blocks_per_lun) * mtd->erasesize
+					* p->lun_count;
 	*busw = 0;
 	if (le16_to_cpu(p->features) & 1)
 		*busw = NAND_BUSWIDTH_16;
-- 
1.7.9.1

Re: [PATCH] support ONFI multi lun NAND

[Florian Fainelli]

Le 03/19/12 15:35, Matthieu CASTET a écrit :
> 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 512MB instead of 1GB.
>
> Signed-off-by: Matthieu Castet<matthieu.castet@parrot.com>

Acked-by: Florian Fainelli <ffainelli@freebox.fr>

> ---
>   drivers/mtd/nand/nand_base.c |    3 ++-
>   1 files changed, 2 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
> index 8a393f9..04c1baf 100644
> --- a/drivers/mtd/nand/nand_base.c
> +++ b/drivers/mtd/nand/nand_base.c
> @@ -2898,7 +2898,8 @@ 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 = (uint64_t)le32_to_cpu(p->blocks_per_lun) * mtd->erasesize
> +					* p->lun_count;
>   	*busw = 0;
>   	if (le16_to_cpu(p->features)&  1)
>   		*busw = NAND_BUSWIDTH_16;

Re: [PATCH] support ONFI multi lun NAND

[Artem Bityutskiy]

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On Mon, 2012-03-19 at 15:35 +0100, Matthieu CASTET wrote:
> -	chip->chipsize = (uint64_t)le32_to_cpu(p->blocks_per_lun) * mtd->erasesize;
> +	chip->chipsize = (uint64_t)le32_to_cpu(p->blocks_per_lun) * mtd->erasesize
> +					* p->lun_count;

I've split this long line on 2 shorter:

+       chip->chipsize = le32_to_cpu(p->blocks_per_lun);
+       chip->chipsize *= (uint64_t)mtd->erasesize * p->lun_count;

And pushed to l2-mtd.git, thanks!

-- 
Best Regards,
Artem Bityutskiy

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