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Message-Id: <1392155209-14495-3-git-send-email-b.brezillon.dev@gmail.com>
Date: Tue, 11 Feb 2014 22:46:47 +0100
From: Boris BREZILLON <b.brezillon.dev@...il.com>
To: David Woodhouse <dwmw2@...radead.org>,
Brian Norris <computersforpeace@...il.com>
Cc: linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
Gupta Pekon <pekon@...com>,
Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>,
Boris BREZILLON <b.brezillon.dev@...il.com>
Subject: [RFC PATCH v2 2/4] mtd: nand: add support for NAND partitions
Add support for NAND partitions, and inderectly for per partition ECC
config.
Provide helper functions to add/delete/allocate nand partitions.
NAND core code now make use of the partition specific nand_ecc_ctrl struct
(if available) when doing read/write operations.
Signed-off-by: Boris BREZILLON <b.brezillon.dev@...il.com>
---
drivers/mtd/nand/Kconfig | 4 +
drivers/mtd/nand/Makefile | 2 +
drivers/mtd/nand/nand_base.c | 691 ++++++++++++++++++++++++++++++++++--------
include/linux/mtd/nand.h | 37 +++
4 files changed, 602 insertions(+), 132 deletions(-)
diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig
index 784dd42..aa62ca3 100644
--- a/drivers/mtd/nand/Kconfig
+++ b/drivers/mtd/nand/Kconfig
@@ -22,6 +22,10 @@ menuconfig MTD_NAND
if MTD_NAND
+config MTD_OF_NAND_PARTS
+ tristate
+ default n
+
config MTD_NAND_BCH
tristate
select BCH
diff --git a/drivers/mtd/nand/Makefile b/drivers/mtd/nand/Makefile
index e3b4a34..992de88 100644
--- a/drivers/mtd/nand/Makefile
+++ b/drivers/mtd/nand/Makefile
@@ -51,4 +51,6 @@ obj-$(CONFIG_MTD_NAND_XWAY) += xway_nand.o
obj-$(CONFIG_MTD_NAND_BCM47XXNFLASH) += bcm47xxnflash/
obj-$(CONFIG_MTD_NAND_SUNXI) += sunxi_nand.o
+obj-$(CONFIG_MTD_OF_NAND_PARTS) += ofnandpart.o
+
nand-objs := nand_base.o nand_bbt.o
diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index f2e9312..b4f8268 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -1031,26 +1031,26 @@ static int nand_read_page_raw_syndrome(struct mtd_info *mtd,
struct nand_chip *chip, uint8_t *buf,
int oob_required, int page)
{
- int eccsize = chip->ecc.size;
- int eccbytes = chip->ecc.bytes;
+ int eccsize = chip->cur_ecc->size;
+ int eccbytes = chip->cur_ecc->bytes;
uint8_t *oob = chip->oob_poi;
int steps, size;
- for (steps = chip->ecc.steps; steps > 0; steps--) {
+ for (steps = chip->cur_ecc->steps; steps > 0; steps--) {
chip->read_buf(mtd, buf, eccsize);
buf += eccsize;
- if (chip->ecc.prepad) {
- chip->read_buf(mtd, oob, chip->ecc.prepad);
- oob += chip->ecc.prepad;
+ if (chip->cur_ecc->prepad) {
+ chip->read_buf(mtd, oob, chip->cur_ecc->prepad);
+ oob += chip->cur_ecc->prepad;
}
chip->read_buf(mtd, oob, eccbytes);
oob += eccbytes;
- if (chip->ecc.postpad) {
- chip->read_buf(mtd, oob, chip->ecc.postpad);
- oob += chip->ecc.postpad;
+ if (chip->cur_ecc->postpad) {
+ chip->read_buf(mtd, oob, chip->cur_ecc->postpad);
+ oob += chip->cur_ecc->postpad;
}
}
@@ -1072,30 +1072,31 @@ static int nand_read_page_raw_syndrome(struct mtd_info *mtd,
static int nand_read_page_swecc(struct mtd_info *mtd, struct nand_chip *chip,
uint8_t *buf, int oob_required, int page)
{
- int i, eccsize = chip->ecc.size;
- int eccbytes = chip->ecc.bytes;
- int eccsteps = chip->ecc.steps;
+ int i, eccsize = chip->cur_ecc->size;
+ int eccbytes = chip->cur_ecc->bytes;
+ int eccsteps = chip->cur_ecc->steps;
uint8_t *p = buf;
uint8_t *ecc_calc = chip->buffers->ecccalc;
uint8_t *ecc_code = chip->buffers->ecccode;
- uint32_t *eccpos = chip->ecc.layout->eccpos;
+ uint32_t *eccpos = chip->cur_ecc->layout->eccpos;
unsigned int max_bitflips = 0;
- chip->ecc.read_page_raw(mtd, chip, buf, 1, page);
+ chip->cur_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]);
+ chip->cur_ecc->calculate(mtd, p, &ecc_calc[i]);
- for (i = 0; i < chip->ecc.total; i++)
+ for (i = 0; i < chip->cur_ecc->total; i++)
ecc_code[i] = chip->oob_poi[eccpos[i]];
- eccsteps = chip->ecc.steps;
+ eccsteps = chip->cur_ecc->steps;
p = buf;
for (i = 0 ; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
int stat;
- stat = chip->ecc.correct(mtd, p, &ecc_code[i], &ecc_calc[i]);
+ stat = chip->cur_ecc->correct(mtd, p, &ecc_code[i],
+ &ecc_calc[i]);
if (stat < 0) {
mtd->ecc_stats.failed++;
} else {
@@ -1118,7 +1119,7 @@ static int nand_read_subpage(struct mtd_info *mtd, struct nand_chip *chip,
uint32_t data_offs, uint32_t readlen, uint8_t *bufpoi)
{
int start_step, end_step, num_steps;
- uint32_t *eccpos = chip->ecc.layout->eccpos;
+ uint32_t *eccpos = chip->cur_ecc->layout->eccpos;
uint8_t *p;
int data_col_addr, i, gaps = 0;
int datafrag_len, eccfrag_len, aligned_len, aligned_pos;
@@ -1127,15 +1128,15 @@ static int nand_read_subpage(struct mtd_info *mtd, struct nand_chip *chip,
unsigned int max_bitflips = 0;
/* Column address within the page aligned to ECC size (256bytes) */
- start_step = data_offs / chip->ecc.size;
- end_step = (data_offs + readlen - 1) / chip->ecc.size;
+ start_step = data_offs / chip->cur_ecc->size;
+ end_step = (data_offs + readlen - 1) / chip->cur_ecc->size;
num_steps = end_step - start_step + 1;
/* Data size aligned to ECC ecc.size */
- datafrag_len = num_steps * chip->ecc.size;
- eccfrag_len = num_steps * chip->ecc.bytes;
+ datafrag_len = num_steps * chip->cur_ecc->size;
+ eccfrag_len = num_steps * chip->cur_ecc->bytes;
- data_col_addr = start_step * chip->ecc.size;
+ data_col_addr = start_step * chip->cur_ecc->size;
/* If we read not a page aligned data */
if (data_col_addr != 0)
chip->cmdfunc(mtd, NAND_CMD_RNDOUT, data_col_addr, -1);
@@ -1144,16 +1145,17 @@ static int nand_read_subpage(struct mtd_info *mtd, struct nand_chip *chip,
chip->read_buf(mtd, p, datafrag_len);
/* Calculate ECC */
- for (i = 0; i < eccfrag_len ; i += chip->ecc.bytes, p += chip->ecc.size)
- chip->ecc.calculate(mtd, p, &chip->buffers->ecccalc[i]);
+ for (i = 0; i < eccfrag_len;
+ i += chip->cur_ecc->bytes, p += chip->cur_ecc->size)
+ chip->cur_ecc->calculate(mtd, p, &chip->buffers->ecccalc[i]);
/*
* The performance is faster if we position offsets according to
* ecc.pos. Let's make sure that there are no gaps in ECC positions.
*/
for (i = 0; i < eccfrag_len - 1; i++) {
- if (eccpos[i + start_step * chip->ecc.bytes] + 1 !=
- eccpos[i + start_step * chip->ecc.bytes + 1]) {
+ if (eccpos[i + start_step * chip->cur_ecc->bytes] + 1 !=
+ eccpos[i + start_step * chip->cur_ecc->bytes + 1]) {
gaps = 1;
break;
}
@@ -1166,13 +1168,14 @@ static int nand_read_subpage(struct mtd_info *mtd, struct nand_chip *chip,
* Send the command to read the particular ECC bytes take care
* about buswidth alignment in read_buf.
*/
- index = start_step * chip->ecc.bytes;
+ index = start_step * chip->cur_ecc->bytes;
aligned_pos = eccpos[index] & ~(busw - 1);
aligned_len = eccfrag_len;
if (eccpos[index] & (busw - 1))
aligned_len++;
- if (eccpos[index + (num_steps * chip->ecc.bytes)] & (busw - 1))
+ if (eccpos[index + (num_steps * chip->cur_ecc->bytes)] &
+ (busw - 1))
aligned_len++;
chip->cmdfunc(mtd, NAND_CMD_RNDOUT,
@@ -1184,11 +1187,13 @@ static int nand_read_subpage(struct mtd_info *mtd, struct nand_chip *chip,
chip->buffers->ecccode[i] = chip->oob_poi[eccpos[i + index]];
p = bufpoi + data_col_addr;
- for (i = 0; i < eccfrag_len ; i += chip->ecc.bytes, p += chip->ecc.size) {
+ for (i = 0; i < eccfrag_len;
+ i += chip->cur_ecc->bytes, p += chip->cur_ecc->size) {
int stat;
- stat = chip->ecc.correct(mtd, p,
- &chip->buffers->ecccode[i], &chip->buffers->ecccalc[i]);
+ stat = chip->cur_ecc->correct(mtd, p,
+ &chip->buffers->ecccode[i],
+ &chip->buffers->ecccalc[i]);
if (stat < 0) {
mtd->ecc_stats.failed++;
} else {
@@ -1212,32 +1217,33 @@ static int nand_read_subpage(struct mtd_info *mtd, struct nand_chip *chip,
static int nand_read_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
uint8_t *buf, int oob_required, int page)
{
- int i, eccsize = chip->ecc.size;
- int eccbytes = chip->ecc.bytes;
- int eccsteps = chip->ecc.steps;
+ int i, eccsize = chip->cur_ecc->size;
+ int eccbytes = chip->cur_ecc->bytes;
+ int eccsteps = chip->cur_ecc->steps;
uint8_t *p = buf;
uint8_t *ecc_calc = chip->buffers->ecccalc;
uint8_t *ecc_code = chip->buffers->ecccode;
- uint32_t *eccpos = chip->ecc.layout->eccpos;
+ uint32_t *eccpos = chip->cur_ecc->layout->eccpos;
unsigned int max_bitflips = 0;
for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
- chip->ecc.hwctl(mtd, NAND_ECC_READ);
+ chip->cur_ecc->hwctl(mtd, NAND_ECC_READ);
chip->read_buf(mtd, p, eccsize);
- chip->ecc.calculate(mtd, p, &ecc_calc[i]);
+ chip->cur_ecc->calculate(mtd, p, &ecc_calc[i]);
}
chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
- for (i = 0; i < chip->ecc.total; i++)
+ for (i = 0; i < chip->cur_ecc->total; i++)
ecc_code[i] = chip->oob_poi[eccpos[i]];
- eccsteps = chip->ecc.steps;
+ eccsteps = chip->cur_ecc->steps;
p = buf;
for (i = 0 ; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
int stat;
- stat = chip->ecc.correct(mtd, p, &ecc_code[i], &ecc_calc[i]);
+ stat = chip->cur_ecc->correct(mtd, p, &ecc_code[i],
+ &ecc_calc[i]);
if (stat < 0) {
mtd->ecc_stats.failed++;
} else {
@@ -1265,12 +1271,12 @@ static int nand_read_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
static int nand_read_page_hwecc_oob_first(struct mtd_info *mtd,
struct nand_chip *chip, uint8_t *buf, int oob_required, int page)
{
- int i, eccsize = chip->ecc.size;
- int eccbytes = chip->ecc.bytes;
- int eccsteps = chip->ecc.steps;
+ int i, eccsize = chip->cur_ecc->size;
+ int eccbytes = chip->cur_ecc->bytes;
+ int eccsteps = chip->cur_ecc->steps;
uint8_t *p = buf;
uint8_t *ecc_code = chip->buffers->ecccode;
- uint32_t *eccpos = chip->ecc.layout->eccpos;
+ uint32_t *eccpos = chip->cur_ecc->layout->eccpos;
uint8_t *ecc_calc = chip->buffers->ecccalc;
unsigned int max_bitflips = 0;
@@ -1279,17 +1285,17 @@ static int nand_read_page_hwecc_oob_first(struct mtd_info *mtd,
chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
chip->cmdfunc(mtd, NAND_CMD_READ0, 0, page);
- for (i = 0; i < chip->ecc.total; i++)
+ for (i = 0; i < chip->cur_ecc->total; i++)
ecc_code[i] = chip->oob_poi[eccpos[i]];
for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
int stat;
- chip->ecc.hwctl(mtd, NAND_ECC_READ);
+ chip->cur_ecc->hwctl(mtd, NAND_ECC_READ);
chip->read_buf(mtd, p, eccsize);
- chip->ecc.calculate(mtd, p, &ecc_calc[i]);
+ chip->cur_ecc->calculate(mtd, p, &ecc_calc[i]);
- stat = chip->ecc.correct(mtd, p, &ecc_code[i], NULL);
+ stat = chip->cur_ecc->correct(mtd, p, &ecc_code[i], NULL);
if (stat < 0) {
mtd->ecc_stats.failed++;
} else {
@@ -1314,9 +1320,9 @@ static int nand_read_page_hwecc_oob_first(struct mtd_info *mtd,
static int nand_read_page_syndrome(struct mtd_info *mtd, struct nand_chip *chip,
uint8_t *buf, int oob_required, int page)
{
- int i, eccsize = chip->ecc.size;
- int eccbytes = chip->ecc.bytes;
- int eccsteps = chip->ecc.steps;
+ int i, eccsize = chip->cur_ecc->size;
+ int eccbytes = chip->cur_ecc->bytes;
+ int eccsteps = chip->cur_ecc->steps;
uint8_t *p = buf;
uint8_t *oob = chip->oob_poi;
unsigned int max_bitflips = 0;
@@ -1324,17 +1330,17 @@ static int nand_read_page_syndrome(struct mtd_info *mtd, struct nand_chip *chip,
for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
int stat;
- chip->ecc.hwctl(mtd, NAND_ECC_READ);
+ chip->cur_ecc->hwctl(mtd, NAND_ECC_READ);
chip->read_buf(mtd, p, eccsize);
- if (chip->ecc.prepad) {
- chip->read_buf(mtd, oob, chip->ecc.prepad);
- oob += chip->ecc.prepad;
+ if (chip->cur_ecc->prepad) {
+ chip->read_buf(mtd, oob, chip->cur_ecc->prepad);
+ oob += chip->cur_ecc->prepad;
}
- chip->ecc.hwctl(mtd, NAND_ECC_READSYN);
+ chip->cur_ecc->hwctl(mtd, NAND_ECC_READSYN);
chip->read_buf(mtd, oob, eccbytes);
- stat = chip->ecc.correct(mtd, p, oob, NULL);
+ stat = chip->cur_ecc->correct(mtd, p, oob, NULL);
if (stat < 0) {
mtd->ecc_stats.failed++;
@@ -1345,9 +1351,9 @@ static int nand_read_page_syndrome(struct mtd_info *mtd, struct nand_chip *chip,
oob += eccbytes;
- if (chip->ecc.postpad) {
- chip->read_buf(mtd, oob, chip->ecc.postpad);
- oob += chip->ecc.postpad;
+ if (chip->cur_ecc->postpad) {
+ chip->read_buf(mtd, oob, chip->cur_ecc->postpad);
+ oob += chip->cur_ecc->postpad;
}
}
@@ -1377,7 +1383,7 @@ static uint8_t *nand_transfer_oob(struct nand_chip *chip, uint8_t *oob,
return oob + len;
case MTD_OPS_AUTO_OOB: {
- struct nand_oobfree *free = chip->ecc.layout->oobfree;
+ struct nand_oobfree *free = chip->cur_ecc->layout->oobfree;
uint32_t boffs = 0, roffs = ops->ooboffs;
size_t bytes = 0;
@@ -1459,16 +1465,20 @@ 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,
- oob_required,
- page);
+ ret = chip->cur_ecc->read_page_raw(mtd, chip,
+ bufpoi,
+ oob_required,
+ page);
else if (!aligned && NAND_HAS_SUBPAGE_READ(chip) &&
!oob)
- ret = chip->ecc.read_subpage(mtd, chip,
- col, bytes, bufpoi);
+ ret = chip->cur_ecc->read_subpage(mtd, chip,
+ col, bytes,
+ bufpoi);
else
- ret = chip->ecc.read_page(mtd, chip, bufpoi,
- oob_required, page);
+ ret = chip->cur_ecc->read_page(mtd, chip,
+ bufpoi,
+ oob_required,
+ page);
if (ret < 0) {
if (!aligned)
/* Invalidate page cache */
@@ -1579,6 +1589,39 @@ static int nand_read(struct mtd_info *mtd, loff_t from, size_t len,
}
/**
+ * nand_part_read - [MTD Interface] MTD compatibility function for nand_do_read_ecc
+ * @mtd: MTD device structure
+ * @from: offset to read from
+ * @len: number of bytes to read
+ * @retlen: pointer to variable to store the number of read bytes
+ * @buf: the databuffer to put data
+ *
+ * Get hold of the chip and call nand_do_read.
+ */
+static int nand_part_read(struct mtd_info *mtd, loff_t from, size_t len,
+ size_t *retlen, uint8_t *buf)
+{
+ struct nand_chip *chip = mtd->priv;
+ struct nand_part *part = to_nand_part(mtd);
+ struct mtd_oob_ops ops;
+ int ret;
+
+ from += part->offset;
+ nand_get_device(mtd, FL_READING);
+ if (part->ecc)
+ chip->cur_ecc = part->ecc;
+ ops.len = len;
+ ops.datbuf = buf;
+ ops.oobbuf = NULL;
+ ops.mode = MTD_OPS_PLACE_OOB;
+ ret = nand_do_read_ops(mtd, from, &ops);
+ *retlen = ops.retlen;
+ chip->cur_ecc = &chip->ecc;
+ nand_release_device(mtd);
+ return ret;
+}
+
+/**
* nand_read_oob_std - [REPLACEABLE] the most common OOB data read function
* @mtd: mtd info structure
* @chip: nand chip info structure
@@ -1604,13 +1647,14 @@ static int nand_read_oob_syndrome(struct mtd_info *mtd, struct nand_chip *chip,
{
uint8_t *buf = chip->oob_poi;
int length = mtd->oobsize;
- int chunk = chip->ecc.bytes + chip->ecc.prepad + chip->ecc.postpad;
- int eccsize = chip->ecc.size;
+ int chunk = chip->cur_ecc->bytes + chip->cur_ecc->prepad +
+ chip->cur_ecc->postpad;
+ int eccsize = chip->cur_ecc->size;
uint8_t *bufpoi = buf;
int i, toread, sndrnd = 0, pos;
- chip->cmdfunc(mtd, NAND_CMD_READ0, chip->ecc.size, page);
- for (i = 0; i < chip->ecc.steps; i++) {
+ chip->cmdfunc(mtd, NAND_CMD_READ0, chip->cur_ecc->size, page);
+ for (i = 0; i < chip->cur_ecc->steps; i++) {
if (sndrnd) {
pos = eccsize + i * (eccsize + chunk);
if (mtd->writesize > 512)
@@ -1663,9 +1707,10 @@ static int nand_write_oob_std(struct mtd_info *mtd, struct nand_chip *chip,
static int nand_write_oob_syndrome(struct mtd_info *mtd,
struct nand_chip *chip, int page)
{
- int chunk = chip->ecc.bytes + chip->ecc.prepad + chip->ecc.postpad;
- int eccsize = chip->ecc.size, length = mtd->oobsize;
- int i, len, pos, status = 0, sndcmd = 0, steps = chip->ecc.steps;
+ int chunk = chip->cur_ecc->bytes + chip->cur_ecc->prepad +
+ chip->cur_ecc->postpad;
+ int eccsize = chip->cur_ecc->size, length = mtd->oobsize;
+ int i, len, pos, status = 0, sndcmd = 0, steps = chip->cur_ecc->steps;
const uint8_t *bufpoi = chip->oob_poi;
/*
@@ -1673,7 +1718,7 @@ static int nand_write_oob_syndrome(struct mtd_info *mtd,
* or
* data-pad-ecc-pad-data-pad .... ecc-pad-oob
*/
- if (!chip->ecc.prepad && !chip->ecc.postpad) {
+ if (!chip->cur_ecc->prepad && !chip->cur_ecc->postpad) {
pos = steps * (eccsize + chunk);
steps = 0;
} else
@@ -1737,7 +1782,7 @@ static int nand_do_read_oob(struct mtd_info *mtd, loff_t from,
stats = mtd->ecc_stats;
if (ops->mode == MTD_OPS_AUTO_OOB)
- len = chip->ecc.layout->oobavail;
+ len = chip->cur_ecc->layout->oobavail;
else
len = mtd->oobsize;
@@ -1765,9 +1810,9 @@ static int nand_do_read_oob(struct mtd_info *mtd, loff_t from,
while (1) {
if (ops->mode == MTD_OPS_RAW)
- ret = chip->ecc.read_oob_raw(mtd, chip, page);
+ ret = chip->cur_ecc->read_oob_raw(mtd, chip, page);
else
- ret = chip->ecc.read_oob(mtd, chip, page);
+ ret = chip->cur_ecc->read_oob(mtd, chip, page);
if (ret < 0)
break;
@@ -1855,6 +1900,56 @@ out:
return ret;
}
+/**
+ * nand_part_read_oob - [MTD Interface] NAND read data and/or out-of-band
+ * @mtd: MTD device structure
+ * @from: offset to read from
+ * @ops: oob operation description structure
+ *
+ * NAND read data and/or out-of-band data.
+ */
+static int nand_part_read_oob(struct mtd_info *mtd, loff_t from,
+ struct mtd_oob_ops *ops)
+{
+ struct nand_chip *chip = mtd->priv;
+ struct nand_part *part = to_nand_part(mtd);
+ int ret = -ENOTSUPP;
+
+ ops->retlen = 0;
+
+ /* Do not allow reads past end of device */
+ if (ops->datbuf && (from + ops->len) > mtd->size) {
+ pr_debug("%s: attempt to read beyond end of device\n",
+ __func__);
+ return -EINVAL;
+ }
+
+ from += part->offset;
+ nand_get_device(mtd, FL_READING);
+ if (part->ecc)
+ chip->cur_ecc = part->ecc;
+
+ switch (ops->mode) {
+ case MTD_OPS_PLACE_OOB:
+ case MTD_OPS_AUTO_OOB:
+ case MTD_OPS_RAW:
+ break;
+
+ default:
+ goto out;
+ }
+
+ if (!ops->datbuf)
+ ret = nand_do_read_oob(mtd, from, ops);
+ else
+ ret = nand_do_read_ops(mtd, from, ops);
+
+out:
+ chip->cur_ecc = &chip->ecc;
+ nand_release_device(mtd);
+ return ret;
+}
+
/**
* nand_write_page_raw - [INTERN] raw page write function
@@ -1888,26 +1983,26 @@ static int nand_write_page_raw_syndrome(struct mtd_info *mtd,
struct nand_chip *chip,
const uint8_t *buf, int oob_required)
{
- int eccsize = chip->ecc.size;
- int eccbytes = chip->ecc.bytes;
+ int eccsize = chip->cur_ecc->size;
+ int eccbytes = chip->cur_ecc->bytes;
uint8_t *oob = chip->oob_poi;
int steps, size;
- for (steps = chip->ecc.steps; steps > 0; steps--) {
+ for (steps = chip->cur_ecc->steps; steps > 0; steps--) {
chip->write_buf(mtd, buf, eccsize);
buf += eccsize;
- if (chip->ecc.prepad) {
- chip->write_buf(mtd, oob, chip->ecc.prepad);
- oob += chip->ecc.prepad;
+ if (chip->cur_ecc->prepad) {
+ chip->write_buf(mtd, oob, chip->cur_ecc->prepad);
+ oob += chip->cur_ecc->prepad;
}
chip->write_buf(mtd, oob, eccbytes);
oob += eccbytes;
- if (chip->ecc.postpad) {
- chip->write_buf(mtd, oob, chip->ecc.postpad);
- oob += chip->ecc.postpad;
+ if (chip->cur_ecc->postpad) {
+ chip->write_buf(mtd, oob, chip->cur_ecc->postpad);
+ oob += chip->cur_ecc->postpad;
}
}
@@ -1927,21 +2022,21 @@ static int nand_write_page_raw_syndrome(struct mtd_info *mtd,
static int nand_write_page_swecc(struct mtd_info *mtd, struct nand_chip *chip,
const uint8_t *buf, int oob_required)
{
- int i, eccsize = chip->ecc.size;
- int eccbytes = chip->ecc.bytes;
- int eccsteps = chip->ecc.steps;
+ int i, eccsize = chip->cur_ecc->size;
+ int eccbytes = chip->cur_ecc->bytes;
+ int eccsteps = chip->cur_ecc->steps;
uint8_t *ecc_calc = chip->buffers->ecccalc;
const uint8_t *p = buf;
- uint32_t *eccpos = chip->ecc.layout->eccpos;
+ uint32_t *eccpos = chip->cur_ecc->layout->eccpos;
/* Software ECC calculation */
for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize)
- chip->ecc.calculate(mtd, p, &ecc_calc[i]);
+ chip->cur_ecc->calculate(mtd, p, &ecc_calc[i]);
- for (i = 0; i < chip->ecc.total; i++)
+ for (i = 0; i < chip->cur_ecc->total; i++)
chip->oob_poi[eccpos[i]] = ecc_calc[i];
- return chip->ecc.write_page_raw(mtd, chip, buf, 1);
+ return chip->cur_ecc->write_page_raw(mtd, chip, buf, 1);
}
/**
@@ -1954,20 +2049,20 @@ static int nand_write_page_swecc(struct mtd_info *mtd, struct nand_chip *chip,
static int nand_write_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
const uint8_t *buf, int oob_required)
{
- int i, eccsize = chip->ecc.size;
- int eccbytes = chip->ecc.bytes;
- int eccsteps = chip->ecc.steps;
+ int i, eccsize = chip->cur_ecc->size;
+ int eccbytes = chip->cur_ecc->bytes;
+ int eccsteps = chip->cur_ecc->steps;
uint8_t *ecc_calc = chip->buffers->ecccalc;
const uint8_t *p = buf;
- uint32_t *eccpos = chip->ecc.layout->eccpos;
+ uint32_t *eccpos = chip->cur_ecc->layout->eccpos;
for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
- chip->ecc.hwctl(mtd, NAND_ECC_WRITE);
+ chip->cur_ecc->hwctl(mtd, NAND_ECC_WRITE);
chip->write_buf(mtd, p, eccsize);
- chip->ecc.calculate(mtd, p, &ecc_calc[i]);
+ chip->cur_ecc->calculate(mtd, p, &ecc_calc[i]);
}
- for (i = 0; i < chip->ecc.total; i++)
+ for (i = 0; i < chip->cur_ecc->total; i++)
chip->oob_poi[eccpos[i]] = ecc_calc[i];
chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
@@ -1992,10 +2087,10 @@ static int nand_write_subpage_hwecc(struct mtd_info *mtd,
{
uint8_t *oob_buf = chip->oob_poi;
uint8_t *ecc_calc = chip->buffers->ecccalc;
- int ecc_size = chip->ecc.size;
- int ecc_bytes = chip->ecc.bytes;
- int ecc_steps = chip->ecc.steps;
- uint32_t *eccpos = chip->ecc.layout->eccpos;
+ int ecc_size = chip->cur_ecc->size;
+ int ecc_bytes = chip->cur_ecc->bytes;
+ int ecc_steps = chip->cur_ecc->steps;
+ uint32_t *eccpos = chip->cur_ecc->layout->eccpos;
uint32_t start_step = offset / ecc_size;
uint32_t end_step = (offset + data_len - 1) / ecc_size;
int oob_bytes = mtd->oobsize / ecc_steps;
@@ -2003,7 +2098,7 @@ static int nand_write_subpage_hwecc(struct mtd_info *mtd,
for (step = 0; step < ecc_steps; step++) {
/* configure controller for WRITE access */
- chip->ecc.hwctl(mtd, NAND_ECC_WRITE);
+ chip->cur_ecc->hwctl(mtd, NAND_ECC_WRITE);
/* write data (untouched subpages already masked by 0xFF) */
chip->write_buf(mtd, buf, ecc_size);
@@ -2012,7 +2107,7 @@ static int nand_write_subpage_hwecc(struct mtd_info *mtd,
if ((step < start_step) || (step > end_step))
memset(ecc_calc, 0xff, ecc_bytes);
else
- chip->ecc.calculate(mtd, buf, ecc_calc);
+ chip->cur_ecc->calculate(mtd, buf, ecc_calc);
/* mask OOB of un-touched subpages by padding 0xFF */
/* if oob_required, preserve OOB metadata of written subpage */
@@ -2027,7 +2122,7 @@ static int nand_write_subpage_hwecc(struct mtd_info *mtd,
/* copy calculated ECC for whole page to chip->buffer->oob */
/* this include masked-value(0xFF) for unwritten subpages */
ecc_calc = chip->buffers->ecccalc;
- for (i = 0; i < chip->ecc.total; i++)
+ for (i = 0; i < chip->cur_ecc->total; i++)
chip->oob_poi[eccpos[i]] = ecc_calc[i];
/* write OOB buffer to NAND device */
@@ -2051,29 +2146,29 @@ static int nand_write_page_syndrome(struct mtd_info *mtd,
struct nand_chip *chip,
const uint8_t *buf, int oob_required)
{
- int i, eccsize = chip->ecc.size;
- int eccbytes = chip->ecc.bytes;
- int eccsteps = chip->ecc.steps;
+ int i, eccsize = chip->cur_ecc->size;
+ int eccbytes = chip->cur_ecc->bytes;
+ int eccsteps = chip->cur_ecc->steps;
const uint8_t *p = buf;
uint8_t *oob = chip->oob_poi;
for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
- chip->ecc.hwctl(mtd, NAND_ECC_WRITE);
+ chip->cur_ecc->hwctl(mtd, NAND_ECC_WRITE);
chip->write_buf(mtd, p, eccsize);
- if (chip->ecc.prepad) {
- chip->write_buf(mtd, oob, chip->ecc.prepad);
- oob += chip->ecc.prepad;
+ if (chip->cur_ecc->prepad) {
+ chip->write_buf(mtd, oob, chip->cur_ecc->prepad);
+ oob += chip->cur_ecc->prepad;
}
- chip->ecc.calculate(mtd, p, oob);
+ chip->cur_ecc->calculate(mtd, p, oob);
chip->write_buf(mtd, oob, eccbytes);
oob += eccbytes;
- if (chip->ecc.postpad) {
- chip->write_buf(mtd, oob, chip->ecc.postpad);
- oob += chip->ecc.postpad;
+ if (chip->cur_ecc->postpad) {
+ chip->write_buf(mtd, oob, chip->cur_ecc->postpad);
+ oob += chip->cur_ecc->postpad;
}
}
@@ -2104,7 +2199,7 @@ static int nand_write_page(struct mtd_info *mtd, struct nand_chip *chip,
int status, subpage;
if (!(chip->options & NAND_NO_SUBPAGE_WRITE) &&
- chip->ecc.write_subpage)
+ chip->cur_ecc->write_subpage)
subpage = offset || (data_len < mtd->writesize);
else
subpage = 0;
@@ -2112,13 +2207,15 @@ static int nand_write_page(struct mtd_info *mtd, struct nand_chip *chip,
chip->cmdfunc(mtd, NAND_CMD_SEQIN, 0x00, page);
if (unlikely(raw))
- status = chip->ecc.write_page_raw(mtd, chip, buf,
- oob_required);
+ status = chip->cur_ecc->write_page_raw(mtd, chip, buf,
+ oob_required);
else if (subpage)
- status = chip->ecc.write_subpage(mtd, chip, offset, data_len,
- buf, oob_required);
+ status = chip->cur_ecc->write_subpage(mtd, chip, offset,
+ data_len, buf,
+ oob_required);
else
- status = chip->ecc.write_page(mtd, chip, buf, oob_required);
+ status = chip->cur_ecc->write_page(mtd, chip, buf,
+ oob_required);
if (status < 0)
return status;
@@ -2177,7 +2274,7 @@ static uint8_t *nand_fill_oob(struct mtd_info *mtd, uint8_t *oob, size_t len,
return oob + len;
case MTD_OPS_AUTO_OOB: {
- struct nand_oobfree *free = chip->ecc.layout->oobfree;
+ struct nand_oobfree *free = chip->cur_ecc->layout->oobfree;
uint32_t boffs = 0, woffs = ops->ooboffs;
size_t bytes = 0;
@@ -2361,6 +2458,46 @@ static int panic_nand_write(struct mtd_info *mtd, loff_t to, size_t len,
}
/**
+ * panic_nand_part_write - [MTD Interface] NAND write with ECC
+ * @mtd: MTD device structure
+ * @to: offset to write to
+ * @len: number of bytes to write
+ * @retlen: pointer to variable to store the number of written bytes
+ * @buf: the data to write
+ *
+ * NAND write with ECC. Used when performing writes in interrupt context, this
+ * may for example be called by mtdoops when writing an oops while in panic.
+ */
+static int panic_nand_part_write(struct mtd_info *mtd, loff_t to, size_t len,
+ size_t *retlen, const uint8_t *buf)
+{
+ struct nand_chip *chip = mtd->priv;
+ struct nand_part *part = to_nand_part(mtd);
+ struct mtd_oob_ops ops;
+ int ret;
+
+ to += part->offset;
+ /* Wait for the device to get ready */
+ panic_nand_wait(mtd, chip, 400);
+
+ /* Grab the device */
+ panic_nand_get_device(chip, mtd, FL_WRITING);
+ if (part->ecc)
+ chip->cur_ecc = part->ecc;
+
+ ops.len = len;
+ ops.datbuf = (uint8_t *)buf;
+ ops.oobbuf = NULL;
+ ops.mode = MTD_OPS_PLACE_OOB;
+
+ ret = nand_do_write_ops(mtd, to, &ops);
+
+ chip->cur_ecc = &chip->ecc;
+ *retlen = ops.retlen;
+ return ret;
+}
+
+/**
* nand_write - [MTD Interface] NAND write with ECC
* @mtd: MTD device structure
* @to: offset to write to
@@ -2388,6 +2525,39 @@ static int nand_write(struct mtd_info *mtd, loff_t to, size_t len,
}
/**
+ * nand_part_write - [MTD Interface] NAND write with ECC
+ * @mtd: MTD device structure
+ * @to: offset to write to
+ * @len: number of bytes to write
+ * @retlen: pointer to variable to store the number of written bytes
+ * @buf: the data to write
+ *
+ * NAND write with ECC.
+ */
+static int nand_part_write(struct mtd_info *mtd, loff_t to, size_t len,
+ size_t *retlen, const uint8_t *buf)
+{
+ struct nand_chip *chip = mtd->priv;
+ struct nand_part *part = to_nand_part(mtd);
+ struct mtd_oob_ops ops;
+ int ret;
+
+ to += part->offset;
+ nand_get_device(mtd, FL_WRITING);
+ if (part->ecc)
+ chip->cur_ecc = part->ecc;
+ ops.len = len;
+ ops.datbuf = (uint8_t *)buf;
+ ops.oobbuf = NULL;
+ ops.mode = MTD_OPS_PLACE_OOB;
+ ret = nand_do_write_ops(mtd, to, &ops);
+ *retlen = ops.retlen;
+ chip->cur_ecc = &chip->ecc;
+ nand_release_device(mtd);
+ return ret;
+}
+
+/**
* nand_do_write_oob - [MTD Interface] NAND write out-of-band
* @mtd: MTD device structure
* @to: offset to write to
@@ -2405,7 +2575,7 @@ static int nand_do_write_oob(struct mtd_info *mtd, loff_t to,
__func__, (unsigned int)to, (int)ops->ooblen);
if (ops->mode == MTD_OPS_AUTO_OOB)
- len = chip->ecc.layout->oobavail;
+ len = chip->cur_ecc->layout->oobavail;
else
len = mtd->oobsize;
@@ -2459,9 +2629,11 @@ static int nand_do_write_oob(struct mtd_info *mtd, loff_t to,
nand_fill_oob(mtd, ops->oobbuf, ops->ooblen, ops);
if (ops->mode == MTD_OPS_RAW)
- status = chip->ecc.write_oob_raw(mtd, chip, page & chip->pagemask);
+ status = chip->cur_ecc->write_oob_raw(mtd, chip,
+ page & chip->pagemask);
else
- status = chip->ecc.write_oob(mtd, chip, page & chip->pagemask);
+ status = chip->cur_ecc->write_oob(mtd, chip,
+ page & chip->pagemask);
chip->select_chip(mtd, -1);
@@ -2516,6 +2688,54 @@ out:
}
/**
+ * nand_write_oob - [MTD Interface] NAND write data and/or out-of-band
+ * @mtd: MTD device structure
+ * @to: offset to write to
+ * @ops: oob operation description structure
+ */
+static int nand_part_write_oob(struct mtd_info *mtd, loff_t to,
+ struct mtd_oob_ops *ops)
+{
+ struct nand_chip *chip = mtd->priv;
+ struct nand_part *part = to_nand_part(mtd);
+ int ret = -ENOTSUPP;
+
+ ops->retlen = 0;
+
+ /* Do not allow writes past end of device */
+ if (ops->datbuf && (to + ops->len) > mtd->size) {
+ pr_debug("%s: attempt to write beyond end of device\n",
+ __func__);
+ return -EINVAL;
+ }
+
+ to += part->offset;
+ nand_get_device(mtd, FL_WRITING);
+ if (part->ecc)
+ chip->cur_ecc = part->ecc;
+
+ switch (ops->mode) {
+ case MTD_OPS_PLACE_OOB:
+ case MTD_OPS_AUTO_OOB:
+ case MTD_OPS_RAW:
+ break;
+
+ default:
+ goto out;
+ }
+
+ if (!ops->datbuf)
+ ret = nand_do_write_oob(mtd, to, ops);
+ else
+ ret = nand_do_write_ops(mtd, to, ops);
+
+out:
+ chip->cur_ecc = &chip->ecc;
+ nand_release_device(mtd);
+ return ret;
+}
+
+/**
* single_erase_cmd - [GENERIC] NAND standard block erase command function
* @mtd: MTD device structure
* @page: the page address of the block which will be erased
@@ -2543,6 +2763,29 @@ static int nand_erase(struct mtd_info *mtd, struct erase_info *instr)
}
/**
+ * nand_part_erase - [MTD Interface] erase partition block(s)
+ * @mtd: MTD device structure
+ * @instr: erase instruction
+ *
+ * Erase one ore more blocks.
+ */
+static int nand_part_erase(struct mtd_info *mtd, struct erase_info *instr)
+{
+ struct nand_part *part = to_nand_part(mtd);
+ int ret;
+
+ instr->addr += part->offset;
+ ret = nand_erase_nand(mtd, instr, 0);
+ if (ret) {
+ if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN)
+ instr->fail_addr -= part->offset;
+ instr->addr -= part->offset;
+ }
+
+ return ret;
+}
+
+/**
* nand_erase_nand - [INTERN] erase block(s)
* @mtd: MTD device structure
* @instr: erase instruction
@@ -2686,6 +2929,18 @@ static int nand_block_isbad(struct mtd_info *mtd, loff_t offs)
}
/**
+ * nand_part_block_isbad - [MTD Interface] Check if block at offset is bad
+ * @mtd: MTD device structure
+ * @offs: offset relative to mtd start
+ */
+static int nand_part_block_isbad(struct mtd_info *mtd, loff_t offs)
+{
+ struct nand_part *part = to_nand_part(mtd);
+
+ return nand_block_checkbad(mtd, part->offset + offs, 1, 0);
+}
+
+/**
* nand_block_markbad - [MTD Interface] Mark block at the given offset as bad
* @mtd: MTD device structure
* @ofs: offset relative to mtd start
@@ -2706,6 +2961,29 @@ static int nand_block_markbad(struct mtd_info *mtd, loff_t ofs)
}
/**
+ * nand_part_block_markbad - [MTD Interface] Mark block at the given offset as
+ * bad
+ * @mtd: MTD device structure
+ * @ofs: offset relative to mtd start
+ */
+static int nand_part_block_markbad(struct mtd_info *mtd, loff_t ofs)
+{
+ struct nand_part *part = to_nand_part(mtd);
+ int ret;
+
+ ofs += part->offset;
+ ret = nand_block_isbad(mtd, ofs);
+ if (ret) {
+ /* If it was bad already, return success and do nothing */
+ if (ret > 0)
+ return 0;
+ return ret;
+ }
+
+ return nand_block_markbad_lowlevel(mtd, ofs);
+}
+
+/**
* nand_onfi_set_features- [REPLACEABLE] set features for ONFI nand
* @mtd: MTD device structure
* @chip: nand chip info structure
@@ -3785,6 +4063,153 @@ static int nand_ecc_ctrl_init(struct mtd_info *mtd, struct nand_ecc_ctrl *ecc)
}
/**
+ * nand_add_partition - [NAND Interface] Add a NAND partition to a NAND device
+ * @master: MTD device structure representing the NAND device
+ * @part: NAND partition to add to the NAND device
+ *
+ * Adds a NAND partition to a NAND device.
+ * The NAND partition cannot overlap with another existing partition.
+ *
+ * Returns zero in case of success and a negative error code in case of failure.
+ */
+int nand_add_partition(struct mtd_info *master, struct nand_part *part)
+{
+ struct nand_chip *chip = master->priv;
+ struct mtd_info *mtd = &part->mtd;
+ struct nand_ecc_ctrl *ecc = part->ecc;
+ struct nand_part *pos;
+ bool inserted = false;
+ int ret;
+
+ /* set up the MTD object for this partition */
+ mtd->type = master->type;
+ mtd->flags = master->flags & ~mtd->flags;
+ mtd->writesize = master->writesize;
+ mtd->writebufsize = master->writebufsize;
+ mtd->oobsize = master->oobsize;
+ mtd->oobavail = master->oobavail;
+ mtd->subpage_sft = master->subpage_sft;
+ mtd->erasesize = master->erasesize;
+
+ mtd->owner = master->owner;
+ mtd->backing_dev_info = master->backing_dev_info;
+
+ mtd->dev.parent = master->dev.parent;
+
+ if (ecc) {
+ ret = nand_ecc_ctrl_init(mtd, ecc);
+ if (ret)
+ return ret;
+ } else {
+ ecc = &chip->ecc;
+ }
+
+ mtd->_erase = nand_part_erase;
+ mtd->_point = NULL;
+ mtd->_unpoint = NULL;
+ mtd->_read = nand_part_read;
+ mtd->_write = nand_part_write;
+ mtd->_panic_write = panic_nand_part_write;
+ mtd->_read_oob = nand_part_read_oob;
+ mtd->_write_oob = nand_part_write_oob;
+ mtd->_sync = nand_sync;
+ mtd->_lock = NULL;
+ mtd->_unlock = NULL;
+ mtd->_suspend = nand_suspend;
+ mtd->_resume = nand_resume;
+ mtd->_block_isbad = nand_part_block_isbad;
+ mtd->_block_markbad = nand_part_block_markbad;
+
+ /* propagate ecc info to mtd_info */
+ mtd->ecclayout = ecc->layout;
+ mtd->ecc_strength = ecc->strength;
+ mtd->ecc_step_size = ecc->size;
+ /*
+ * Initialize bitflip_threshold to its default prior scan_bbt() call.
+ * scan_bbt() might invoke mtd_read(), thus bitflip_threshold must be
+ * properly set.
+ */
+ if (!mtd->bitflip_threshold)
+ mtd->bitflip_threshold = mtd->ecc_strength;
+
+ part->master = master;
+
+ list_for_each_entry(pos, &chip->partitions, node) {
+ if (part->offset >= pos->offset + pos->mtd.size)
+ continue;
+ else if (part->offset + mtd->size > pos->offset)
+ return -EINVAL;
+
+ list_add(&part->node, pos->node.prev);
+ inserted = true;
+ break;
+ }
+
+ if (!inserted)
+ list_add_tail(&part->node, &chip->partitions);
+
+ ret = mtd_device_register(mtd, NULL, 0);
+ if (ret) {
+ list_del(&part->node);
+ goto out;
+ }
+
+out:
+ mutex_unlock(&chip->part_lock);
+ return ret;
+}
+EXPORT_SYMBOL(nand_add_partition);
+
+/**
+ * nand_del_partition - [NAND Interface] Delete a NAND part from a NAND dev
+ * @part: NAND partition to delete
+ *
+ * Deletes a NAND partition from a NAND device.
+ */
+void nand_del_partition(struct nand_part *part)
+{
+ struct nand_chip *chip = part->mtd.priv;
+
+ mutex_lock(&chip->part_lock);
+ mtd_device_unregister(&part->mtd);
+ list_del(&part->node);
+ mutex_unlock(&chip->part_lock);
+
+ if (part->ecc && part->ecc->mode == NAND_ECC_SOFT_BCH)
+ nand_bch_free((struct nand_bch_control *)part->ecc->priv);
+
+ if (part->release)
+ part->release(part);
+}
+EXPORT_SYMBOL(nand_del_partition);
+
+/*
+ * NAND part release function. Used by nandpart_alloc as its release function.
+ */
+static void nandpart_release(struct nand_part *part)
+{
+ kfree(part);
+}
+
+/**
+ * nandpart_alloc - [NAND Interface] Allocate a NAND part struct
+ *
+ * Allocate a NAND partition and assign the nandpart release function.
+ * This nand_part struct must be filled before passing it to the
+ * nand_add_partition function.
+ */
+struct nand_part *nandpart_alloc(void)
+{
+ struct nand_part *part = kzalloc(sizeof(*part), GFP_KERNEL);
+ if (!part)
+ return ERR_PTR(-ENOMEM);
+ part->release = nandpart_release;
+
+ return part;
+}
+EXPORT_SYMBOL(nandpart_alloc);
+
+/**
* nand_scan_tail - [NAND Interface] Scan for the NAND device
* @mtd: MTD device structure
*
@@ -3822,6 +4247,8 @@ int nand_scan_tail(struct mtd_info *mtd)
return ret;
}
+ chip->cur_ecc = &chip->ecc;
+
/* Allow subpage writes up to ecc.steps. Not possible for MLC flash */
if (!(chip->options & NAND_NO_SUBPAGE_WRITE) && nand_is_slc(chip)) {
switch (ecc->steps) {
diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
index c70e0a3..c4d271a 100644
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -574,6 +574,7 @@ struct nand_chip {
struct nand_hw_control *controller;
struct nand_ecc_ctrl ecc;
+ struct nand_ecc_ctrl *cur_ecc;
struct nand_buffers *buffers;
struct nand_hw_control hwcontrol;
@@ -583,9 +584,40 @@ struct nand_chip {
struct nand_bbt_descr *badblock_pattern;
+ struct list_head partitions;
+ struct mutex part_lock;
+
void *priv;
};
+/**
+ * struct nand_part - NAND partition structure
+ * @node: list node used to attach the partition to its NAND dev
+ * @mtd: MTD partiton info
+ * @master: MTD device representing the NAND chip
+ * @offset: partition offset
+ * @ecc: partition specific ECC struct
+ * @release: function used to release this nand_part struct
+ *
+ * NAND partitions work as standard MTD partitions except it can override
+ * NAND chip ECC handling.
+ * This is particularly useful for SoCs that need specific ECC configs to boot
+ * from NAND while these ECC configs do not fit the NAND chip ECC requirements.
+ */
+struct nand_part {
+ struct list_head node;
+ struct mtd_info mtd;
+ struct mtd_info *master;
+ uint64_t offset;
+ struct nand_ecc_ctrl *ecc;
+ void (*release)(struct nand_part *part);
+};
+
+static inline struct nand_part *to_nand_part(struct mtd_info *mtd)
+{
+ return container_of(mtd, struct nand_part, mtd);
+}
+
/*
* NAND Flash Manufacturer ID Codes
*/
@@ -806,6 +838,11 @@ static inline bool nand_is_slc(struct nand_chip *chip)
return chip->bits_per_cell == 1;
}
+int nand_add_partition(struct mtd_info *master, struct nand_part *part);
+
+void nand_del_partition(struct nand_part *part);
+
+struct nand_part *nandpart_alloc(void);
/**
* struct nand_sdr_timings - SDR NAND chip timings
--
1.7.9.5
--
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