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path: root/drivers/mtd/nand/nand_base.c
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Diffstat (limited to 'drivers/mtd/nand/nand_base.c')
-rw-r--r--drivers/mtd/nand/nand_base.c133
1 files changed, 91 insertions, 42 deletions
diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index 41bfcae..dfe56e0 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -362,7 +362,7 @@ static int nand_default_block_markbad(struct mtd_info *mtd, loff_t ofs)
* access
*/
ofs += mtd->oobsize;
- chip->ops.len = 2;
+ chip->ops.len = chip->ops.ooblen = 2;
chip->ops.datbuf = NULL;
chip->ops.oobbuf = buf;
chip->ops.ooboffs = chip->badblockpos & ~0x01;
@@ -755,7 +755,7 @@ static int nand_read_page_raw(struct mtd_info *mtd, struct nand_chip *chip,
}
/**
- * nand_read_page_swecc - {REPLACABLE] software ecc based page read function
+ * nand_read_page_swecc - [REPLACABLE] software ecc based page read function
* @mtd: mtd info structure
* @chip: nand chip info structure
* @buf: buffer to store read data
@@ -795,7 +795,7 @@ static int nand_read_page_swecc(struct mtd_info *mtd, struct nand_chip *chip,
}
/**
- * nand_read_page_hwecc - {REPLACABLE] hardware ecc based page read function
+ * nand_read_page_hwecc - [REPLACABLE] hardware ecc based page read function
* @mtd: mtd info structure
* @chip: nand chip info structure
* @buf: buffer to store read data
@@ -839,7 +839,7 @@ static int nand_read_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
}
/**
- * nand_read_page_syndrome - {REPLACABLE] hardware ecc syndrom based page read
+ * nand_read_page_syndrome - [REPLACABLE] hardware ecc syndrom based page read
* @mtd: mtd info structure
* @chip: nand chip info structure
* @buf: buffer to store read data
@@ -897,12 +897,11 @@ static int nand_read_page_syndrome(struct mtd_info *mtd, struct nand_chip *chip,
* @chip: nand chip structure
* @oob: oob destination address
* @ops: oob ops structure
+ * @len: size of oob to transfer
*/
static uint8_t *nand_transfer_oob(struct nand_chip *chip, uint8_t *oob,
- struct mtd_oob_ops *ops)
+ struct mtd_oob_ops *ops, size_t len)
{
- size_t len = ops->ooblen;
-
switch(ops->mode) {
case MTD_OOB_PLACE:
@@ -960,6 +959,7 @@ static int nand_do_read_ops(struct mtd_info *mtd, loff_t from,
int sndcmd = 1;
int ret = 0;
uint32_t readlen = ops->len;
+ uint32_t oobreadlen = ops->ooblen;
uint8_t *bufpoi, *oob, *buf;
stats = mtd->ecc_stats;
@@ -971,7 +971,6 @@ static int nand_do_read_ops(struct mtd_info *mtd, loff_t from,
page = realpage & chip->pagemask;
col = (int)(from & (mtd->writesize - 1));
- chip->oob_poi = chip->buffers->oobrbuf;
buf = ops->datbuf;
oob = ops->oobbuf;
@@ -1007,10 +1006,17 @@ static int nand_do_read_ops(struct mtd_info *mtd, loff_t from,
if (unlikely(oob)) {
/* Raw mode does data:oob:data:oob */
- if (ops->mode != MTD_OOB_RAW)
- oob = nand_transfer_oob(chip, oob, ops);
- else
- buf = nand_transfer_oob(chip, buf, ops);
+ if (ops->mode != MTD_OOB_RAW) {
+ int toread = min(oobreadlen,
+ chip->ecc.layout->oobavail);
+ if (toread) {
+ oob = nand_transfer_oob(chip,
+ oob, ops, toread);
+ oobreadlen -= toread;
+ }
+ } else
+ buf = nand_transfer_oob(chip,
+ buf, ops, mtd->oobsize);
}
if (!(chip->options & NAND_NO_READRDY)) {
@@ -1057,6 +1063,8 @@ static int nand_do_read_ops(struct mtd_info *mtd, loff_t from,
}
ops->retlen = ops->len - (size_t) readlen;
+ if (oob)
+ ops->oobretlen = ops->ooblen - oobreadlen;
if (ret)
return ret;
@@ -1257,12 +1265,18 @@ static int nand_do_read_oob(struct mtd_info *mtd, loff_t from,
int page, realpage, chipnr, sndcmd = 1;
struct nand_chip *chip = mtd->priv;
int blkcheck = (1 << (chip->phys_erase_shift - chip->page_shift)) - 1;
- int readlen = ops->len;
+ int readlen = ops->ooblen;
+ int len;
uint8_t *buf = ops->oobbuf;
DEBUG(MTD_DEBUG_LEVEL3, "nand_read_oob: from = 0x%08Lx, len = %i\n",
(unsigned long long)from, readlen);
+ if (ops->mode == MTD_OOB_RAW)
+ len = mtd->oobsize;
+ else
+ len = chip->ecc.layout->oobavail;
+
chipnr = (int)(from >> chip->chip_shift);
chip->select_chip(mtd, chipnr);
@@ -1270,11 +1284,11 @@ static int nand_do_read_oob(struct mtd_info *mtd, loff_t from,
realpage = (int)(from >> chip->page_shift);
page = realpage & chip->pagemask;
- chip->oob_poi = chip->buffers->oobrbuf;
-
while(1) {
sndcmd = chip->ecc.read_oob(mtd, chip, page, sndcmd);
- buf = nand_transfer_oob(chip, buf, ops);
+
+ len = min(len, readlen);
+ buf = nand_transfer_oob(chip, buf, ops, len);
if (!(chip->options & NAND_NO_READRDY)) {
/*
@@ -1289,7 +1303,7 @@ static int nand_do_read_oob(struct mtd_info *mtd, loff_t from,
nand_wait_ready(mtd);
}
- readlen -= ops->ooblen;
+ readlen -= len;
if (!readlen)
break;
@@ -1311,7 +1325,7 @@ static int nand_do_read_oob(struct mtd_info *mtd, loff_t from,
sndcmd = 1;
}
- ops->retlen = ops->len;
+ ops->oobretlen = ops->ooblen;
return 0;
}
@@ -1332,7 +1346,7 @@ static int nand_read_oob(struct mtd_info *mtd, loff_t from,
ops->retlen = 0;
/* Do not allow reads past end of device */
- if ((from + ops->len) > mtd->size) {
+ if (ops->datbuf && (from + ops->len) > mtd->size) {
DEBUG(MTD_DEBUG_LEVEL0, "nand_read_oob: "
"Attempt read beyond end of device\n");
return -EINVAL;
@@ -1375,7 +1389,7 @@ static void nand_write_page_raw(struct mtd_info *mtd, struct nand_chip *chip,
}
/**
- * nand_write_page_swecc - {REPLACABLE] software ecc based page write function
+ * nand_write_page_swecc - [REPLACABLE] software ecc based page write function
* @mtd: mtd info structure
* @chip: nand chip info structure
* @buf: data buffer
@@ -1401,7 +1415,7 @@ static void nand_write_page_swecc(struct mtd_info *mtd, struct nand_chip *chip,
}
/**
- * nand_write_page_hwecc - {REPLACABLE] hardware ecc based page write function
+ * nand_write_page_hwecc - [REPLACABLE] hardware ecc based page write function
* @mtd: mtd info structure
* @chip: nand chip info structure
* @buf: data buffer
@@ -1429,7 +1443,7 @@ static void nand_write_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
}
/**
- * nand_write_page_syndrome - {REPLACABLE] hardware ecc syndrom based page write
+ * nand_write_page_syndrome - [REPLACABLE] hardware ecc syndrom based page write
* @mtd: mtd info structure
* @chip: nand chip info structure
* @buf: data buffer
@@ -1577,7 +1591,7 @@ static uint8_t *nand_fill_oob(struct nand_chip *chip, uint8_t *oob,
return NULL;
}
-#define NOTALIGNED(x) (x & (mtd->writesize-1)) != 0
+#define NOTALIGNED(x) (x & (chip->subpagesize - 1)) != 0
/**
* nand_do_write_ops - [Internal] NAND write with ECC
@@ -1590,15 +1604,16 @@ static uint8_t *nand_fill_oob(struct nand_chip *chip, uint8_t *oob,
static int nand_do_write_ops(struct mtd_info *mtd, loff_t to,
struct mtd_oob_ops *ops)
{
- int chipnr, realpage, page, blockmask;
+ int chipnr, realpage, page, blockmask, column;
struct nand_chip *chip = mtd->priv;
uint32_t writelen = ops->len;
uint8_t *oob = ops->oobbuf;
uint8_t *buf = ops->datbuf;
- int bytes = mtd->writesize;
- int ret;
+ int ret, subpage;
ops->retlen = 0;
+ if (!writelen)
+ return 0;
/* reject writes, which are not page aligned */
if (NOTALIGNED(to) || NOTALIGNED(ops->len)) {
@@ -1607,8 +1622,11 @@ static int nand_do_write_ops(struct mtd_info *mtd, loff_t to,
return -EINVAL;
}
- if (!writelen)
- return 0;
+ column = to & (mtd->writesize - 1);
+ subpage = column || (writelen & (mtd->writesize - 1));
+
+ if (subpage && oob)
+ return -EINVAL;
chipnr = (int)(to >> chip->chip_shift);
chip->select_chip(mtd, chipnr);
@@ -1626,15 +1644,29 @@ static int nand_do_write_ops(struct mtd_info *mtd, loff_t to,
(chip->pagebuf << chip->page_shift) < (to + ops->len))
chip->pagebuf = -1;
- chip->oob_poi = chip->buffers->oobwbuf;
+ /* If we're not given explicit OOB data, let it be 0xFF */
+ if (likely(!oob))
+ memset(chip->oob_poi, 0xff, mtd->oobsize);
while(1) {
+ int bytes = mtd->writesize;
int cached = writelen > bytes && page != blockmask;
+ uint8_t *wbuf = buf;
+
+ /* Partial page write ? */
+ if (unlikely(column || writelen < (mtd->writesize - 1))) {
+ cached = 0;
+ bytes = min_t(int, bytes - column, (int) writelen);
+ chip->pagebuf = -1;
+ memset(chip->buffers->databuf, 0xff, mtd->writesize);
+ memcpy(&chip->buffers->databuf[column], buf, bytes);
+ wbuf = chip->buffers->databuf;
+ }
if (unlikely(oob))
oob = nand_fill_oob(chip, oob, ops);
- ret = chip->write_page(mtd, chip, buf, page, cached,
+ ret = chip->write_page(mtd, chip, wbuf, page, cached,
(ops->mode == MTD_OOB_RAW));
if (ret)
break;
@@ -1643,6 +1675,7 @@ static int nand_do_write_ops(struct mtd_info *mtd, loff_t to,
if (!writelen)
break;
+ column = 0;
buf += bytes;
realpage++;
@@ -1655,10 +1688,9 @@ static int nand_do_write_ops(struct mtd_info *mtd, loff_t to,
}
}
- if (unlikely(oob))
- memset(chip->oob_poi, 0xff, mtd->oobsize);
-
ops->retlen = ops->len - writelen;
+ if (unlikely(oob))
+ ops->oobretlen = ops->ooblen;
return ret;
}
@@ -1714,10 +1746,10 @@ static int nand_do_write_oob(struct mtd_info *mtd, loff_t to,
struct nand_chip *chip = mtd->priv;
DEBUG(MTD_DEBUG_LEVEL3, "nand_write_oob: to = 0x%08x, len = %i\n",
- (unsigned int)to, (int)ops->len);
+ (unsigned int)to, (int)ops->ooblen);
/* Do not allow write past end of page */
- if ((ops->ooboffs + ops->len) > mtd->oobsize) {
+ if ((ops->ooboffs + ops->ooblen) > mtd->oobsize) {
DEBUG(MTD_DEBUG_LEVEL0, "nand_write_oob: "
"Attempt to write past end of page\n");
return -EINVAL;
@@ -1745,7 +1777,6 @@ static int nand_do_write_oob(struct mtd_info *mtd, loff_t to,
if (page == chip->pagebuf)
chip->pagebuf = -1;
- chip->oob_poi = chip->buffers->oobwbuf;
memset(chip->oob_poi, 0xff, mtd->oobsize);
nand_fill_oob(chip, ops->oobbuf, ops);
status = chip->ecc.write_oob(mtd, chip, page & chip->pagemask);
@@ -1754,7 +1785,7 @@ static int nand_do_write_oob(struct mtd_info *mtd, loff_t to,
if (status)
return status;
- ops->retlen = ops->len;
+ ops->oobretlen = ops->ooblen;
return 0;
}
@@ -1774,7 +1805,7 @@ static int nand_write_oob(struct mtd_info *mtd, loff_t to,
ops->retlen = 0;
/* Do not allow writes past end of device */
- if ((to + ops->len) > mtd->size) {
+ if (ops->datbuf && (to + ops->len) > mtd->size) {
DEBUG(MTD_DEBUG_LEVEL0, "nand_read_oob: "
"Attempt read beyond end of device\n");
return -EINVAL;
@@ -2188,8 +2219,8 @@ static struct nand_flash_dev *nand_get_flash_type(struct mtd_info *mtd,
/* Newer devices have all the information in additional id bytes */
if (!type->pagesize) {
int extid;
- /* The 3rd id byte contains non relevant data ATM */
- extid = chip->read_byte(mtd);
+ /* The 3rd id byte holds MLC / multichip data */
+ chip->cellinfo = chip->read_byte(mtd);
/* The 4th id byte is the important one */
extid = chip->read_byte(mtd);
/* Calc pagesize */
@@ -2349,8 +2380,8 @@ int nand_scan_tail(struct mtd_info *mtd)
if (!chip->buffers)
return -ENOMEM;
- /* Preset the internal oob write buffer */
- memset(chip->buffers->oobwbuf, 0xff, mtd->oobsize);
+ /* Set the internal oob buffer location, just after the page data */
+ chip->oob_poi = chip->buffers->databuf + mtd->writesize;
/*
* If no default placement scheme is given, select an appropriate one
@@ -2469,6 +2500,24 @@ int nand_scan_tail(struct mtd_info *mtd)
}
chip->ecc.total = chip->ecc.steps * chip->ecc.bytes;
+ /*
+ * Allow subpage writes up to ecc.steps. Not possible for MLC
+ * FLASH.
+ */
+ if (!(chip->options & NAND_NO_SUBPAGE_WRITE) &&
+ !(chip->cellinfo & NAND_CI_CELLTYPE_MSK)) {
+ switch(chip->ecc.steps) {
+ case 2:
+ mtd->subpage_sft = 1;
+ break;
+ case 4:
+ case 8:
+ mtd->subpage_sft = 2;
+ break;
+ }
+ }
+ chip->subpagesize = mtd->writesize >> mtd->subpage_sft;
+
/* Initialize state */
chip->state = FL_READY;