From: Scott Wood <scottwood@freescale.com>
To: <shuo.liu@freescale.com>
Cc: Artem.Bityutskiy@nokia.com, linuxppc-dev@lists.ozlabs.org,
linux-kernel@vger.kernel.org, linux-mtd@lists.infradead.org,
akpm@linux-foundation.org, dwmw2@infradead.org
Subject: Re: [PATCH 3/3] mtd/nand : workaround for Freescale FCM to support large-page Nand chip
Date: Tue, 6 Dec 2011 18:09:29 -0600 [thread overview]
Message-ID: <4EDEAEB9.6020703@freescale.com> (raw)
In-Reply-To: <1322973098-2528-3-git-send-email-shuo.liu@freescale.com>
On 12/03/2011 10:31 PM, shuo.liu@freescale.com wrote:
> From: Liu Shuo <shuo.liu@freescale.com>
>
> Freescale FCM controller has a 2K size limitation of buffer RAM. In order
> to support the Nand flash chip whose page size is larger than 2K bytes,
> we read/write 2k data repeatedly by issuing FIR_OP_RB/FIR_OP_WB and save
> them to a large buffer.
>
> Signed-off-by: Liu Shuo <shuo.liu@freescale.com>
> ---
> v3:
> -remove page_size of struct fsl_elbc_mtd.
> -do a oob write by NAND_CMD_RNDIN.
>
> drivers/mtd/nand/fsl_elbc_nand.c | 243 ++++++++++++++++++++++++++++++++++----
> 1 files changed, 218 insertions(+), 25 deletions(-)
What is the plan for bad block marker migration?
> @@ -473,13 +568,72 @@ static void fsl_elbc_cmdfunc(struct mtd_info *mtd, unsigned int command,
> * write so the HW generates the ECC.
> */
> if (elbc_fcm_ctrl->oob || elbc_fcm_ctrl->column != 0 ||
> - elbc_fcm_ctrl->index != mtd->writesize + mtd->oobsize)
> - out_be32(&lbc->fbcr,
> - elbc_fcm_ctrl->index - elbc_fcm_ctrl->column);
> - else
> + elbc_fcm_ctrl->index != mtd->writesize + mtd->oobsize) {
> + if (elbc_fcm_ctrl->oob && mtd->writesize > 2048) {
> + out_be32(&lbc->fbcr, 64);
> + } else {
> + out_be32(&lbc->fbcr, elbc_fcm_ctrl->index
> + - elbc_fcm_ctrl->column);
> + }
We need to limit ourselves to the regions that have actually been
written to in the buffer. fbcr needs to be set separately for first and
last subpages, with intermediate subpages having 0, 64, or 2112 as
appropriate. Subpages that are entirely before column or entirely after
column + index should be skipped.
> + } else {
> + out_be32(&lbc->fir, FIR_OP_WB << FIR_OP1_SHIFT);
> + for (i = 1; i < n; i++) {
> + if (i == n - 1) {
> + elbc_fcm_ctrl->use_mdr = 1;
> + out_be32(&lbc->fir,
> + (FIR_OP_WB << FIR_OP1_SHIFT) |
> + (FIR_OP_CM3 << FIR_OP2_SHIFT) |
> + (FIR_OP_CW1 << FIR_OP3_SHIFT) |
> + (FIR_OP_RS << FIR_OP4_SHIFT));
Please explicitly show the (FIR_OP_NOP << FIR_OP0_SHIFT) compenent.
> + } else if (mtd->writesize >= 2048 && mtd->writesize <= 16 * 1024) {
> +
> setbits32(&lbc->bank[priv->bank].or, OR_FCM_PGS);
Don't insert a blank line here.
-Scott
next prev parent reply other threads:[~2011-12-07 0:09 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-04 4:31 [PATCH 1/3] mtd/nand : use elbc_fcm_ctrl->oob to set FPAR_MS bit of FPAR shuo.liu
2011-12-04 4:31 ` [PATCH 2/3] mtd/nand : set correct length to FBCR for a non-full-page write shuo.liu
2011-12-04 4:31 ` [PATCH 3/3] mtd/nand : workaround for Freescale FCM to support large-page Nand chip shuo.liu
2011-12-05 6:47 ` Artem Bityutskiy
2011-12-05 19:46 ` Scott Wood
2011-12-06 11:49 ` Artem Bityutskiy
2011-12-06 11:49 ` Artem Bityutskiy
2011-12-07 0:09 ` Scott Wood [this message]
2011-12-07 3:55 ` LiuShuo
2011-12-07 19:11 ` Scott Wood
2011-12-08 10:44 ` LiuShuo
2011-12-08 18:43 ` Scott Wood
2011-12-12 21:09 ` Artem Bityutskiy
2011-12-12 21:15 ` Scott Wood
2011-12-12 21:19 ` Artem Bityutskiy
2011-12-12 21:30 ` Scott Wood
2011-12-13 2:46 ` LiuShuo
2011-12-14 8:41 ` LiuShuo
2011-12-14 20:15 ` Scott Wood
2011-12-15 4:59 ` Li Yang
2011-12-15 17:32 ` Scott Wood
2011-12-16 2:44 ` LiuShuo
2011-12-16 17:59 ` Scott Wood
2011-12-19 11:05 ` Li Yang
2011-12-19 16:47 ` Scott Wood
2011-12-20 9:08 ` Li Yang
2011-12-20 19:48 ` Scott Wood
2011-12-17 14:35 ` Artem Bityutskiy
2011-12-19 18:38 ` Scott Wood
2011-12-19 18:42 ` Scott Wood
2011-12-14 3:41 ` LiuShuo
2011-12-14 20:53 ` Scott Wood
2011-12-05 6:50 ` [PATCH 1/3] mtd/nand : use elbc_fcm_ctrl->oob to set FPAR_MS bit of FPAR Artem Bityutskiy
-- strict thread matches above, loose matches on Subject: below --
2011-11-24 0:41 b35362
2011-11-24 0:41 ` [PATCH 3/3] mtd/nand : workaround for Freescale FCM to support large-page Nand chip b35362
2011-11-24 7:37 ` Li Yang-R58472
2011-11-28 17:20 ` Scott Wood
2011-11-24 7:41 ` Artem Bityutskiy
2011-11-24 7:49 ` Li Yang-R58472
2011-11-24 8:16 ` Artem Bityutskiy
2011-11-24 10:02 ` LiuShuo
2011-11-24 11:07 ` Artem Bityutskiy
2011-11-28 21:48 ` Scott Wood
2011-11-28 21:49 ` Scott Wood
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4EDEAEB9.6020703@freescale.com \
--to=scottwood@freescale.com \
--cc=Artem.Bityutskiy@nokia.com \
--cc=akpm@linux-foundation.org \
--cc=dwmw2@infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mtd@lists.infradead.org \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=shuo.liu@freescale.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).