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[MTD] [OneNAND] main read/write ops support for yaffs2

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Now we can use yaffs2 on OneNAND

Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
This commit is contained in:
Kyungmin Park 2007-09-06 10:06:12 +09:00 committed by David Woodhouse
parent 12f77c9eed
commit d15057b703
1 changed files with 281 additions and 164 deletions
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445
drivers/mtd/onenand/onenand_base.c
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@ -763,31 +763,83 @@ static void onenand_release_device(struct mtd_info *mtd)
}
/**
* onenand_read - [MTD Interface] Read data from flash
* onenand_transfer_auto_oob - [Internal] oob auto-placement transfer
* @param mtd MTD device structure
* @param buf destination address
* @param column oob offset to read from
* @param thislen oob length to read
*/
static int onenand_transfer_auto_oob(struct mtd_info *mtd, uint8_t *buf, int column,
int thislen)
{
struct onenand_chip *this = mtd->priv;
struct nand_oobfree *free;
int readcol = column;
int readend = column + thislen;
int lastgap = 0;
unsigned int i;
uint8_t *oob_buf = this->oob_buf;
free = this->ecclayout->oobfree;
for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES && free->length; i++, free++) {
if (readcol >= lastgap)
readcol += free->offset - lastgap;
if (readend >= lastgap)
readend += free->offset - lastgap;
lastgap = free->offset + free->length;
}
this->read_bufferram(mtd, ONENAND_SPARERAM, oob_buf, 0, mtd->oobsize);
free = this->ecclayout->oobfree;
for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES && free->length; i++, free++) {
int free_end = free->offset + free->length;
if (free->offset < readend && free_end > readcol) {
int st = max_t(int,free->offset,readcol);
int ed = min_t(int,free_end,readend);
int n = ed - st;
memcpy(buf, oob_buf + st, n);
buf += n;
} else if (column == 0)
break;
}
return 0;
}
/**
* onenand_read_ops - [OneNAND Interface] OneNAND read main and/or out-of-band
* @param mtd MTD device structure
* @param from offset to read from
* @param len number of bytes to read
* @param retlen pointer to variable to store the number of read bytes
* @param buf the databuffer to put data
* @param ops: oob operation description structure
*
* Read with ecc
*/
static int onenand_read(struct mtd_info *mtd, loff_t from, size_t len,
size_t *retlen, u_char *buf)
* OneNAND read main and/or out-of-band data
*/
static int onenand_read_ops(struct mtd_info *mtd, loff_t from,
struct mtd_oob_ops *ops)
{
struct onenand_chip *this = mtd->priv;
struct mtd_ecc_stats stats;
int read = 0, column;
int thislen;
size_t len = ops->len;
size_t ooblen = ops->ooblen;
u_char *buf = ops->datbuf;
u_char *oobbuf = ops->oobbuf;
int read = 0, column, thislen;
int oobread = 0, oobcolumn, thisooblen, oobsize;
int ret = 0, boundary = 0;
int writesize = this->writesize;
DEBUG(MTD_DEBUG_LEVEL3, "onenand_read: from = 0x%08x, len = %i\n", (unsigned int) from, (int) len);
DEBUG(MTD_DEBUG_LEVEL3, "onenand_read_ops: from = 0x%08x, len = %i\n", (unsigned int) from, (int) len);
if (ops->mode == MTD_OOB_AUTO)
oobsize = this->ecclayout->oobavail;
else
oobsize = mtd->oobsize;
oobcolumn = from & (mtd->oobsize - 1);
/* Do not allow reads past end of device */
if ((from + len) > mtd->size) {
printk(KERN_ERR "onenand_read: Attempt read beyond end of device\n");
*retlen = 0;
printk(KERN_ERR "onenand_read_ops: Attempt read beyond end of device\n");
ops->retlen = 0;
ops->oobretlen = 0;
return -EINVAL;
}
@ -832,6 +884,21 @@ static int onenand_read(struct mtd_info *mtd, loff_t from, size_t len,
}
/* While load is going, read from last bufferRAM */
this->read_bufferram(mtd, ONENAND_DATARAM, buf, column, thislen);
/* Read oob area if needed */
if (oobbuf) {
thisooblen = oobsize - oobcolumn;
thisooblen = min_t(int, thisooblen, ooblen - oobread);
if (ops->mode == MTD_OOB_AUTO)
onenand_transfer_auto_oob(mtd, oobbuf, oobcolumn, thisooblen);
else
this->read_bufferram(mtd, ONENAND_SPARERAM, oobbuf, oobcolumn, thisooblen);
oobread += thisooblen;
oobbuf += thisooblen;
oobcolumn = 0;
}
/* See if we are done */
read += thislen;
if (read == len)
@ -857,7 +924,8 @@ static int onenand_read(struct mtd_info *mtd, loff_t from, size_t len,
* fs driver will take care of that, because
* retlen == desired len and result == -EBADMSG
*/
*retlen = read;
ops->retlen = read;
ops->oobretlen = oobread;
if (mtd->ecc_stats.failed - stats.failed)
return -EBADMSG;
@ -868,56 +936,11 @@ static int onenand_read(struct mtd_info *mtd, loff_t from, size_t len,
return mtd->ecc_stats.corrected - stats.corrected ? -EUCLEAN : 0;
}
/**
* onenand_transfer_auto_oob - [Internal] oob auto-placement transfer
* @param mtd MTD device structure
* @param buf destination address
* @param column oob offset to read from
* @param thislen oob length to read
*/
static int onenand_transfer_auto_oob(struct mtd_info *mtd, uint8_t *buf, int column,
int thislen)
{
struct onenand_chip *this = mtd->priv;
struct nand_oobfree *free;
int readcol = column;
int readend = column + thislen;
int lastgap = 0;
unsigned int i;
uint8_t *oob_buf = this->oob_buf;
free = this->ecclayout->oobfree;
for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES && free->length; i++, free++) {
if (readcol >= lastgap)
readcol += free->offset - lastgap;
if (readend >= lastgap)
readend += free->offset - lastgap;
lastgap = free->offset + free->length;
}
this->read_bufferram(mtd, ONENAND_SPARERAM, oob_buf, 0, mtd->oobsize);
free = this->ecclayout->oobfree;
for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES && free->length; i++, free++) {
int free_end = free->offset + free->length;
if (free->offset < readend && free_end > readcol) {
int st = max_t(int,free->offset,readcol);
int ed = min_t(int,free_end,readend);
int n = ed - st;
memcpy(buf, oob_buf + st, n);
buf += n;
} else if (column == 0)
break;
}
return 0;
}
/**
* onenand_do_read_oob - [MTD Interface] OneNAND read out-of-band
* @param mtd MTD device structure
* @param from offset to read from
* @param len number of bytes to read
* @param retlen pointer to variable to store the number of read bytes
* @param buf the databuffer to put data
* @param mode operation mode
* @param ops: oob operation description structure
*
* OneNAND read out-of-band data from the spare area
*/
@ -1007,10 +1030,39 @@ static int onenand_do_read_oob(struct mtd_info *mtd, loff_t from,
}
/**
* onenand_read_oob - [MTD Interface] NAND write data and/or out-of-band
* onenand_read - [MTD Interface] Read data from flash
* @param mtd MTD device structure
* @param from offset to read from
* @param len number of bytes to read
* @param retlen pointer to variable to store the number of read bytes
* @param buf the databuffer to put data
*
* Read with ecc
*/
static int onenand_read(struct mtd_info *mtd, loff_t from, size_t len,
size_t *retlen, u_char *buf)
{
struct mtd_oob_ops ops = {
.len = len,
.ooblen = 0,
.datbuf = buf,
.oobbuf = NULL,
};
int ret;
ret = onenand_read_ops(mtd, from, &ops);
*retlen = ops.retlen;
return ret;
}
/**
* onenand_read_oob - [MTD Interface] Read main and/or out-of-band
* @param mtd: MTD device structure
* @param from: offset to read from
* @param ops: oob operation description structure
* Read main and/or out-of-band
*/
static int onenand_read_oob(struct mtd_info *mtd, loff_t from,
struct mtd_oob_ops *ops)
@ -1024,6 +1076,10 @@ static int onenand_read_oob(struct mtd_info *mtd, loff_t from,
default:
return -EINVAL;
}
if (ops->datbuf)
return onenand_read_ops(mtd, from, ops);
return onenand_do_read_oob(mtd, from, ops);
}
@ -1148,7 +1204,6 @@ int onenand_bbt_read_oob(struct mtd_info *mtd, loff_t from,
* @param mtd MTD device structure
* @param buf the databuffer to verify
* @param to offset to read from
*
*/
static int onenand_verify_oob(struct mtd_info *mtd, const u_char *buf, loff_t to)
{
@ -1176,7 +1231,6 @@ static int onenand_verify_oob(struct mtd_info *mtd, const u_char *buf, loff_t to
* @param buf the databuffer to verify
* @param addr offset to read from
* @param len number of bytes to read and compare
*
*/
static int onenand_verify(struct mtd_info *mtd, const u_char *buf, loff_t addr, size_t len)
{
@ -1221,107 +1275,6 @@ static int onenand_verify(struct mtd_info *mtd, const u_char *buf, loff_t addr,
#define NOTALIGNED(x) ((x & (this->subpagesize - 1)) != 0)
/**
* onenand_write - [MTD Interface] write buffer to FLASH
* @param mtd MTD device structure
* @param to offset to write to
* @param len number of bytes to write
* @param retlen pointer to variable to store the number of written bytes
* @param buf the data to write
*
* Write with ECC
*/
static int onenand_write(struct mtd_info *mtd, loff_t to, size_t len,
size_t *retlen, const u_char *buf)
{
struct onenand_chip *this = mtd->priv;
int written = 0;
int ret = 0;
int column, subpage;
DEBUG(MTD_DEBUG_LEVEL3, "onenand_write: to = 0x%08x, len = %i\n", (unsigned int) to, (int) len);
/* Initialize retlen, in case of early exit */
*retlen = 0;
/* Do not allow writes past end of device */
if (unlikely((to + len) > mtd->size)) {
printk(KERN_ERR "onenand_write: Attempt write to past end of device\n");
return -EINVAL;
}
/* Reject writes, which are not page aligned */
if (unlikely(NOTALIGNED(to)) || unlikely(NOTALIGNED(len))) {
printk(KERN_ERR "onenand_write: Attempt to write not page aligned data\n");
return -EINVAL;
}
column = to & (mtd->writesize - 1);
/* Grab the lock and see if the device is available */
onenand_get_device(mtd, FL_WRITING);
/* Loop until all data write */
while (written < len) {
int thislen = min_t(int, mtd->writesize - column, len - written);
u_char *wbuf = (u_char *) buf;
cond_resched();
this->command(mtd, ONENAND_CMD_BUFFERRAM, to, thislen);
/* Partial page write */
subpage = thislen < mtd->writesize;
if (subpage) {
memset(this->page_buf, 0xff, mtd->writesize);
memcpy(this->page_buf + column, buf, thislen);
wbuf = this->page_buf;
}
this->write_bufferram(mtd, ONENAND_DATARAM, wbuf, 0, mtd->writesize);
this->write_bufferram(mtd, ONENAND_SPARERAM, ffchars, 0, mtd->oobsize);
this->command(mtd, ONENAND_CMD_PROG, to, mtd->writesize);
ret = this->wait(mtd, FL_WRITING);
/* In partial page write we don't update bufferram */
onenand_update_bufferram(mtd, to, !ret && !subpage);
if (ONENAND_IS_2PLANE(this)) {
ONENAND_SET_BUFFERRAM1(this);
onenand_update_bufferram(mtd, to + this->writesize, !ret && !subpage);
}
if (ret) {
printk(KERN_ERR "onenand_write: write filaed %d\n", ret);
break;
}
/* Only check verify write turn on */
ret = onenand_verify(mtd, (u_char *) wbuf, to, thislen);
if (ret) {
printk(KERN_ERR "onenand_write: verify failed %d\n", ret);
break;
}
written += thislen;
if (written == len)
break;
column = 0;
to += thislen;
buf += thislen;
}
/* Deselect and wake up anyone waiting on the device */
onenand_release_device(mtd);
*retlen = written;
return ret;
}
/**
* onenand_fill_auto_oob - [Internal] oob auto-placement transfer
* @param mtd MTD device structure
@ -1363,6 +1316,139 @@ static int onenand_fill_auto_oob(struct mtd_info *mtd, u_char *oob_buf,
return 0;
}
/**
* onenand_write_ops - [OneNAND Interface] write main and/or out-of-band
* @param mtd MTD device structure
* @param to offset to write to
* @param ops oob operation description structure
*
* Write main and/or oob with ECC
*/
static int onenand_write_ops(struct mtd_info *mtd, loff_t to,
struct mtd_oob_ops *ops)
{
struct onenand_chip *this = mtd->priv;
int written = 0, column, thislen, subpage;
int oobwritten = 0, oobcolumn, thisooblen, oobsize;
size_t len = ops->len;
size_t ooblen = ops->ooblen;
const u_char *buf = ops->datbuf;
const u_char *oob = ops->oobbuf;
u_char *oobbuf;
int ret = 0;
DEBUG(MTD_DEBUG_LEVEL3, "onenand_write: to = 0x%08x, len = %i\n", (unsigned int) to, (int) len);
/* Initialize retlen, in case of early exit */
ops->retlen = 0;
ops->oobretlen = 0;
/* Do not allow writes past end of device */
if (unlikely((to + len) > mtd->size)) {
printk(KERN_ERR "onenand_write: Attempt write to past end of device\n");
return -EINVAL;
}
/* Reject writes, which are not page aligned */
if (unlikely(NOTALIGNED(to)) || unlikely(NOTALIGNED(len))) {
printk(KERN_ERR "onenand_write: Attempt to write not page aligned data\n");
return -EINVAL;
}
if (ops->mode == MTD_OOB_AUTO)
oobsize = this->ecclayout->oobavail;
else
oobsize = mtd->oobsize;
oobcolumn = to & (mtd->oobsize - 1);
column = to & (mtd->writesize - 1);
/* Grab the lock and see if the device is available */
onenand_get_device(mtd, FL_WRITING);
/* Loop until all data write */
while (written < len) {
u_char *wbuf = (u_char *) buf;
thislen = min_t(int, mtd->writesize - column, len - written);
thisooblen = min_t(int, oobsize - oobcolumn, ooblen - oobwritten);
cond_resched();
this->command(mtd, ONENAND_CMD_BUFFERRAM, to, thislen);
/* Partial page write */
subpage = thislen < mtd->writesize;
if (subpage) {
memset(this->page_buf, 0xff, mtd->writesize);
memcpy(this->page_buf + column, buf, thislen);
wbuf = this->page_buf;
}
this->write_bufferram(mtd, ONENAND_DATARAM, wbuf, 0, mtd->writesize);
if (oob) {
oobbuf = this->oob_buf;
/* We send data to spare ram with oobsize
* to prevent byte access */
memset(oobbuf, 0xff, mtd->oobsize);
if (ops->mode == MTD_OOB_AUTO)
onenand_fill_auto_oob(mtd, oobbuf, oob, oobcolumn, thisooblen);
else
memcpy(oobbuf + oobcolumn, oob, thisooblen);
oobwritten += thisooblen;
oob += thisooblen;
oobcolumn = 0;
} else
oobbuf = (u_char *) ffchars;
this->write_bufferram(mtd, ONENAND_SPARERAM, oobbuf, 0, mtd->oobsize);
this->command(mtd, ONENAND_CMD_PROG, to, mtd->writesize);
ret = this->wait(mtd, FL_WRITING);
/* In partial page write we don't update bufferram */
onenand_update_bufferram(mtd, to, !ret && !subpage);
if (ONENAND_IS_2PLANE(this)) {
ONENAND_SET_BUFFERRAM1(this);
onenand_update_bufferram(mtd, to + this->writesize, !ret && !subpage);
}
if (ret) {
printk(KERN_ERR "onenand_write: write filaed %d\n", ret);
break;
}
/* Only check verify write turn on */
ret = onenand_verify(mtd, (u_char *) wbuf, to, thislen);
if (ret) {
printk(KERN_ERR "onenand_write: verify failed %d\n", ret);
break;
}
written += thislen;
if (written == len)
break;
column = 0;
to += thislen;
buf += thislen;
}
/* Deselect and wake up anyone waiting on the device */
onenand_release_device(mtd);
ops->retlen = written;
return ret;
}
/**
* onenand_do_write_oob - [Internal] OneNAND write out-of-band
* @param mtd MTD device structure
@ -1478,6 +1564,33 @@ static int onenand_do_write_oob(struct mtd_info *mtd, loff_t to,
return ret;
}
/**
* onenand_write - [MTD Interface] write buffer to FLASH
* @param mtd MTD device structure
* @param to offset to write to
* @param len number of bytes to write
* @param retlen pointer to variable to store the number of written bytes
* @param buf the data to write
*
* Write with ECC
*/
static int onenand_write(struct mtd_info *mtd, loff_t to, size_t len,
size_t *retlen, const u_char *buf)
{
struct mtd_oob_ops ops = {
.len = len,
.ooblen = 0,
.datbuf = (u_char *) buf,
.oobbuf = NULL,
};
int ret;
ret = onenand_write_ops(mtd, to, &ops);
*retlen = ops.retlen;
return ret;
}
/**
* onenand_write_oob - [MTD Interface] NAND write data and/or out-of-band
* @param mtd: MTD device structure
@ -1496,6 +1609,10 @@ static int onenand_write_oob(struct mtd_info *mtd, loff_t to,
default:
return -EINVAL;
}
if (ops->datbuf)
return onenand_write_ops(mtd, to, ops);
return onenand_do_write_oob(mtd, to, ops);
}