Messages in this thread | | | From | Li Yang-R58472 <> | Subject | RE: [PATCH 3/3] mtd/nand : workaround for Freescale FCM to support large-page Nand chip | Date | Thu, 24 Nov 2011 07:37:21 +0000 |
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> Subject: [PATCH 3/3] mtd/nand : workaround for Freescale FCM to support > large-page Nand chip > > From: Liu Shuo <b35362@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 <b35362@freescale.com> > Signed-off-by: Li Yang <leoli@freescale.com> > --- > drivers/mtd/nand/fsl_elbc_nand.c | 211 > +++++++++++++++++++++++++++++++++++--- > 1 files changed, 194 insertions(+), 17 deletions(-) > > diff --git a/drivers/mtd/nand/fsl_elbc_nand.c b/drivers/mtd/nand/fsl_elbc_nand.c > index d634c5f..c96e714 100644 > --- a/drivers/mtd/nand/fsl_elbc_nand.c > +++ b/drivers/mtd/nand/fsl_elbc_nand.c
[snip]
> +static void io_to_buffer(struct mtd_info *mtd, int subpage, int oob) > +{ > + struct nand_chip *chip = mtd->priv; > + struct fsl_elbc_mtd *priv = chip->priv; > + struct fsl_elbc_fcm_ctrl *elbc_fcm_ctrl = priv->ctrl->nand; > + void *src, *dst; > + int len = (oob ? 64 : 2048); > + > + if (oob) > + dst = elbc_fcm_ctrl->buffer + mtd->writesize + subpage * 64; > + else > + dst = elbc_fcm_ctrl->buffer + subpage * 2048; > + > + src = elbc_fcm_ctrl->addr + (oob ? 2048 : 0); > + memcpy_fromio(dst, src, len);
Might be safer to use _memcpy_fromio()
> +} > + > +static void buffer_to_io(struct mtd_info *mtd, int subpage, int oob) > +{ > + struct nand_chip *chip = mtd->priv; > + struct fsl_elbc_mtd *priv = chip->priv; > + struct fsl_elbc_fcm_ctrl *elbc_fcm_ctrl = priv->ctrl->nand; > + void *src, *dst; > + int len = (oob ? 64 : 2048); > + > + if (oob) > + src = elbc_fcm_ctrl->buffer + mtd->writesize + subpage * 64; > + else > + src = elbc_fcm_ctrl->buffer + subpage * 2048; > + > + dst = elbc_fcm_ctrl->addr + (oob ? 2048 : 0); > + memcpy_toio(dst, src, len); > + > + /* See the in_8() in fsl_elbc_write_buf() */ > + in_8(elbc_fcm_ctrl->addr);
Should be safer to read back the last char.
- Leo
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