From mboxrd@z Thu Jan 1 00:00:00 1970 From: Marek Vasut Date: Thu, 8 Dec 2011 17:37:22 +0100 Subject: [U-Boot] [PATCH 5/5] mtd/nand: workaround for Freescale FCM to support 4k pagesize Nand chip In-Reply-To: <1323341352-14996-5-git-send-email-Shengzhou.Liu@freescale.com> References: <1323341352-14996-1-git-send-email-Shengzhou.Liu@freescale.com> <1323341352-14996-4-git-send-email-Shengzhou.Liu@freescale.com> <1323341352-14996-5-git-send-email-Shengzhou.Liu@freescale.com> Message-ID: <201112081737.22273.marek.vasut@gmail.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de > 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: Shengzhou Liu > Signed-off-by: Liu Shuo > --- > drivers/mtd/nand/fsl_elbc_nand.c | 279 > +++++++++++++++++++++++++++++++++---- 1 files changed, 248 insertions(+), > 31 deletions(-) > > diff --git a/drivers/mtd/nand/fsl_elbc_nand.c > b/drivers/mtd/nand/fsl_elbc_nand.c index 52362b1..3983c8c 100644 > --- a/drivers/mtd/nand/fsl_elbc_nand.c > +++ b/drivers/mtd/nand/fsl_elbc_nand.c > @@ -64,7 +64,6 @@ struct fsl_elbc_mtd { > struct device *dev; > int bank; /* Chip select bank number */ > u8 __iomem *vbase; /* Chip select base virtual address */ > - int page_size; /* NAND page size (0=512, 1=2048) */ > unsigned int fmr; /* FCM Flash Mode Register value */ > }; > > @@ -85,6 +84,8 @@ struct fsl_elbc_ctrl { > unsigned int mdr; /* UPM/FCM Data Register value */ > unsigned int use_mdr; /* Non zero if the MDR is to be set */ > unsigned int oob; /* Non zero if operating on OOB data */ > + char *buffer; /* just used when pagesize is greater */ Start sentence with capital letter > + /* than FCM RAM 2K limitation */ > }; > > /* These map to the positions used by the FCM hardware ECC generator */ > @@ -159,6 +160,44 @@ static struct nand_bbt_descr bbt_mirror_descr = { > .pattern = mirror_pattern, > }; > > +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_ctrl *ctrl = priv->ctrl; > + void *src, *dst; > + int len = (oob ? 64 : 2048); No parenthesis ... > + > + /* for emulating 4096+ bytes NAND using 2048-byte FCM RAM */ > + if (oob) > + dst = ctrl->buffer + mtd->writesize + subpage * 64; > + else > + dst = ctrl->buffer + subpage * 2048; subpage * len ? > + > + src = ctrl->addr + (oob ? 2048 : 0); > + memcpy_fromio(dst, src, len); > +} > + > +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_ctrl *ctrl = priv->ctrl; > + void *src, *dst; > + int len = (oob ? 64 : 2048); > + > + if (oob) > + src = ctrl->buffer + mtd->writesize + subpage * 64; > + else > + src = ctrl->buffer + subpage * 2048; DTTO M