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mtd: nand: add 'oob_required' argument to NAND {read,write}_page interfaces

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New NAND controllers can perform read/write via HW engines which don't expose
OOB data in their DMA mode. To reflect this, we should rework the nand_chip /
nand_ecc_ctrl interfaces that assume that drivers will always read/write OOB
data in the nand_chip.oob_poi buffer. A better interface includes a boolean
argument that explicitly tells the callee when OOB data is requested by the
calling layer (for reading/writing to/from nand_chip.oob_poi).

This patch adds the 'oob_required' parameter to each relevant {read,write}_page
interface; all 'oob_required' parameters are left unused for now. The next
patch will set the parameter properly in the nand_base.c callers, and follow-up
patches will make use of 'oob_required' in some of the callee functions.

Note that currently, there is no harm in ignoring the 'oob_required' parameter
and *always* utilizing nand_chip.oob_poi, but there can be
performance/complexity/design benefits from avoiding filling oob_poi in the
common case. I will try to implement this for some drivers which can be ported
easily.

Note: I couldn't compile-test all of these easily, as some had ARCH
dependencies.

[dwmw2: Merge later 1/0 vs. true/false cleanup]
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Reviewed-by: Shmulik Ladkani <shmulik.ladkani@gmail.com>
Acked-by: Jiandong Zheng <jdzheng@broadcom.com>
Acked-by: Mike Dunn <mikedunn@newsguy.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Brian Norris
2012-05-02 10:14:55 -07:00
committed by David Woodhouse
parent b4f7aa84d6
commit 1fbb938dff
15 changed files with 90 additions and 72 deletions
Download Patch File Download Diff File Expand all files Collapse all files

56
drivers/mtd/nand/nand_base.c
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@@ -1066,12 +1066,13 @@ EXPORT_SYMBOL(nand_lock);
* @mtd: mtd info structure
* @chip: nand chip info structure
* @buf: buffer to store read data
* @oob_required: caller requires OOB data read to chip->oob_poi
* @page: page number to read
*
* Not for syndrome calculating ECC controllers, which use a special oob layout.
*/
static int nand_read_page_raw(struct mtd_info *mtd, struct nand_chip *chip,
uint8_t *buf, int page)
uint8_t *buf, int oob_required, int page)
{
chip->read_buf(mtd, buf, mtd->writesize);
chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
@@ -1083,13 +1084,14 @@ static int nand_read_page_raw(struct mtd_info *mtd, struct nand_chip *chip,
* @mtd: mtd info structure
* @chip: nand chip info structure
* @buf: buffer to store read data
* @oob_required: caller requires OOB data read to chip->oob_poi
* @page: page number to read
*
* We need a special oob layout and handling even when OOB isn't used.
*/
static int nand_read_page_raw_syndrome(struct mtd_info *mtd,
struct nand_chip *chip,
uint8_t *buf, int page)
struct nand_chip *chip, uint8_t *buf,
int oob_required, int page)
{
int eccsize = chip->ecc.size;
int eccbytes = chip->ecc.bytes;
@@ -1126,10 +1128,11 @@ static int nand_read_page_raw_syndrome(struct mtd_info *mtd,
* @mtd: mtd info structure
* @chip: nand chip info structure
* @buf: buffer to store read data
* @oob_required: caller requires OOB data read to chip->oob_poi
* @page: page number to read
*/
static int nand_read_page_swecc(struct mtd_info *mtd, struct nand_chip *chip,
uint8_t *buf, int page)
uint8_t *buf, int oob_required, int page)
{
int i, eccsize = chip->ecc.size;
int eccbytes = chip->ecc.bytes;
@@ -1140,7 +1143,7 @@ static int nand_read_page_swecc(struct mtd_info *mtd, struct nand_chip *chip,
uint32_t *eccpos = chip->ecc.layout->eccpos;
unsigned int max_bitflips = 0;
chip->ecc.read_page_raw(mtd, chip, buf, page);
chip->ecc.read_page_raw(mtd, chip, buf, 1, page);
for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize)
chip->ecc.calculate(mtd, p, &ecc_calc[i]);
@@ -1263,12 +1266,13 @@ static int nand_read_subpage(struct mtd_info *mtd, struct nand_chip *chip,
* @mtd: mtd info structure
* @chip: nand chip info structure
* @buf: buffer to store read data
* @oob_required: caller requires OOB data read to chip->oob_poi
* @page: page number to read
*
* Not for syndrome calculating ECC controllers which need a special oob layout.
*/
static int nand_read_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
uint8_t *buf, int page)
uint8_t *buf, int oob_required, int page)
{
int i, eccsize = chip->ecc.size;
int eccbytes = chip->ecc.bytes;
@@ -1311,6 +1315,7 @@ static int nand_read_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
* @mtd: mtd info structure
* @chip: nand chip info structure
* @buf: buffer to store read data
* @oob_required: caller requires OOB data read to chip->oob_poi
* @page: page number to read
*
* Hardware ECC for large page chips, require OOB to be read first. For this
@@ -1320,7 +1325,7 @@ static int nand_read_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
* the data area, by overwriting the NAND manufacturer bad block markings.
*/
static int nand_read_page_hwecc_oob_first(struct mtd_info *mtd,
struct nand_chip *chip, uint8_t *buf, int page)
struct nand_chip *chip, uint8_t *buf, int oob_required, int page)
{
int i, eccsize = chip->ecc.size;
int eccbytes = chip->ecc.bytes;
@@ -1362,13 +1367,14 @@ static int nand_read_page_hwecc_oob_first(struct mtd_info *mtd,
* @mtd: mtd info structure
* @chip: nand chip info structure
* @buf: buffer to store read data
* @oob_required: caller requires OOB data read to chip->oob_poi
* @page: page number to read
*
* The hw generator calculates the error syndrome automatically. Therefore we
* need a special oob layout and handling.
*/
static int nand_read_page_syndrome(struct mtd_info *mtd, struct nand_chip *chip,
uint8_t *buf, int page)
uint8_t *buf, int oob_required, int page)
{
int i, eccsize = chip->ecc.size;
int eccbytes = chip->ecc.bytes;
@@ -1514,14 +1520,14 @@ static int nand_do_read_ops(struct mtd_info *mtd, loff_t from,
* the read methods return max bitflips per ecc step.
*/
if (unlikely(ops->mode == MTD_OPS_RAW))
ret = chip->ecc.read_page_raw(mtd, chip,
bufpoi, page);
ret = chip->ecc.read_page_raw(mtd, chip, bufpoi,
1, page);
else if (!aligned && NAND_SUBPAGE_READ(chip) && !oob)
ret = chip->ecc.read_subpage(mtd, chip,
col, bytes, bufpoi);
else
ret = chip->ecc.read_page(mtd, chip, bufpoi,
page);
1, page);
if (ret < 0) {
if (!aligned)
/* Invalidate page cache */
@@ -1913,11 +1919,12 @@ out:
* @mtd: mtd info structure
* @chip: nand chip info structure
* @buf: data buffer
* @oob_required: must write chip->oob_poi to OOB
*
* Not for syndrome calculating ECC controllers, which use a special oob layout.
*/
static void nand_write_page_raw(struct mtd_info *mtd, struct nand_chip *chip,
const uint8_t *buf)
const uint8_t *buf, int oob_required)
{
chip->write_buf(mtd, buf, mtd->writesize);
chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
@@ -1928,12 +1935,13 @@ static void nand_write_page_raw(struct mtd_info *mtd, struct nand_chip *chip,
* @mtd: mtd info structure
* @chip: nand chip info structure
* @buf: data buffer
* @oob_required: must write chip->oob_poi to OOB
*
* We need a special oob layout and handling even when ECC isn't checked.
*/
static void nand_write_page_raw_syndrome(struct mtd_info *mtd,
struct nand_chip *chip,
const uint8_t *buf)
const uint8_t *buf, int oob_required)
{
int eccsize = chip->ecc.size;
int eccbytes = chip->ecc.bytes;
@@ -1967,9 +1975,10 @@ static void nand_write_page_raw_syndrome(struct mtd_info *mtd,
* @mtd: mtd info structure
* @chip: nand chip info structure
* @buf: data buffer
* @oob_required: must write chip->oob_poi to OOB
*/
static void nand_write_page_swecc(struct mtd_info *mtd, struct nand_chip *chip,
const uint8_t *buf)
const uint8_t *buf, int oob_required)
{
int i, eccsize = chip->ecc.size;
int eccbytes = chip->ecc.bytes;
@@ -1985,7 +1994,7 @@ static void nand_write_page_swecc(struct mtd_info *mtd, struct nand_chip *chip,
for (i = 0; i < chip->ecc.total; i++)
chip->oob_poi[eccpos[i]] = ecc_calc[i];
chip->ecc.write_page_raw(mtd, chip, buf);
chip->ecc.write_page_raw(mtd, chip, buf, 1);
}
/**
@@ -1993,9 +2002,10 @@ static void nand_write_page_swecc(struct mtd_info *mtd, struct nand_chip *chip,
* @mtd: mtd info structure
* @chip: nand chip info structure
* @buf: data buffer
* @oob_required: must write chip->oob_poi to OOB
*/
static void nand_write_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
const uint8_t *buf)
const uint8_t *buf, int oob_required)
{
int i, eccsize = chip->ecc.size;
int eccbytes = chip->ecc.bytes;
@@ -2021,12 +2031,14 @@ static void nand_write_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
* @mtd: mtd info structure
* @chip: nand chip info structure
* @buf: data buffer
* @oob_required: must write chip->oob_poi to OOB
*
* The hw generator calculates the error syndrome automatically. Therefore we
* need a special oob layout and handling.
*/
static void nand_write_page_syndrome(struct mtd_info *mtd,
struct nand_chip *chip, const uint8_t *buf)
struct nand_chip *chip,
const uint8_t *buf, int oob_required)
{
int i, eccsize = chip->ecc.size;
int eccbytes = chip->ecc.bytes;
@@ -2065,21 +2077,23 @@ static void nand_write_page_syndrome(struct mtd_info *mtd,
* @mtd: MTD device structure
* @chip: NAND chip descriptor
* @buf: the data to write
* @oob_required: must write chip->oob_poi to OOB
* @page: page number to write
* @cached: cached programming
* @raw: use _raw version of write_page
*/
static int nand_write_page(struct mtd_info *mtd, struct nand_chip *chip,
const uint8_t *buf, int page, int cached, int raw)
const uint8_t *buf, int oob_required, int page,
int cached, int raw)
{
int status;
chip->cmdfunc(mtd, NAND_CMD_SEQIN, 0x00, page);
if (unlikely(raw))
chip->ecc.write_page_raw(mtd, chip, buf);
chip->ecc.write_page_raw(mtd, chip, buf, oob_required);
else
chip->ecc.write_page(mtd, chip, buf);
chip->ecc.write_page(mtd, chip, buf, oob_required);
/*
* Cached progamming disabled for now. Not sure if it's worth the
@@ -2261,7 +2275,7 @@ static int nand_do_write_ops(struct mtd_info *mtd, loff_t to,
memset(chip->oob_poi, 0xff, mtd->oobsize);
}
ret = chip->write_page(mtd, chip, wbuf, page, cached,
ret = chip->write_page(mtd, chip, wbuf, 1, page, cached,
(ops->mode == MTD_OPS_RAW));
if (ret)
break;