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[MTD] OneNAND: add subpage write support 

OneNAND supports up to 4 writes at one NAND page. Add support of this feature.

Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
This commit is contained in:
Kyungmin Park 2006-12-22 16:21:54 +09:00 committed by Artem Bityutskiy
parent f627248736
commit 60d84f9739
2 changed files with 46 additions and 16 deletions
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60
drivers/mtd/onenand/onenand_base.c
View File

@ -192,8 +192,6 @@ static int onenand_command(struct mtd_info *mtd, int cmd, loff_t addr, size_t le
struct onenand_chip *this = mtd->priv;
int value, readcmd = 0, block_cmd = 0;
int block, page;
/* Now we use page size operation */
int sectors = 4, count = 4;
/* Address translation */
switch (cmd) {
@ -245,6 +243,8 @@ static int onenand_command(struct mtd_info *mtd, int cmd, loff_t addr, size_t le
}
if (page != -1) {
/* Now we use page size operation */
int sectors = 4, count = 4;
int dataram;
switch (cmd) {
@ -914,6 +914,10 @@ static int onenand_verify_page(struct mtd_info *mtd, u_char *buf, loff_t addr)
void __iomem *dataram0, *dataram1;
int ret = 0;
/* In partial page write, just skip it */
if ((addr & (mtd->writesize - 1)) != 0)
return 0;
this->command(mtd, ONENAND_CMD_READ, addr, mtd->writesize);
ret = this->wait(mtd, FL_READING);
@ -936,7 +940,7 @@ static int onenand_verify_page(struct mtd_info *mtd, u_char *buf, loff_t addr)
#define onenand_verify_oob(...) (0)
#endif
#define NOTALIGNED(x) ((x & (mtd->writesize - 1)) != 0)
#define NOTALIGNED(x) ((x & (this->subpagesize - 1)) != 0)
/**
* onenand_write - [MTD Interface] write buffer to FLASH
@ -954,6 +958,7 @@ static int onenand_write(struct mtd_info *mtd, loff_t to, size_t len,
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);
@ -972,45 +977,61 @@ static int onenand_write(struct mtd_info *mtd, loff_t to, size_t len,
return -EINVAL;
}
column = to & (mtd->writesize - 1);
subpage = column || (len & (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, len - written);
int bytes = mtd->writesize;
int thislen = min_t(int, bytes, len - written);
u_char *wbuf = (u_char *) buf;
this->command(mtd, ONENAND_CMD_BUFFERRAM, to, mtd->writesize);
this->command(mtd, ONENAND_CMD_BUFFERRAM, to, bytes);
this->write_bufferram(mtd, ONENAND_DATARAM, buf, 0, thislen);
/* Partial page write */
if (subpage) {
bytes = min_t(int, bytes - column, (int) len);
memset(this->page_buf, 0xff, mtd->writesize);
memcpy(this->page_buf + column, buf, bytes);
wbuf = this->page_buf;
/* Even though partial write, we need page size */
thislen = mtd->writesize;
}
this->write_bufferram(mtd, ONENAND_DATARAM, wbuf, 0, thislen);
this->write_bufferram(mtd, ONENAND_SPARERAM, ffchars, 0, mtd->oobsize);
this->command(mtd, ONENAND_CMD_PROG, to, mtd->writesize);
onenand_update_bufferram(mtd, to, 1);
/* In partial page write we don't update bufferram */
onenand_update_bufferram(mtd, to, !subpage);
ret = this->wait(mtd, FL_WRITING);
if (ret) {
DEBUG(MTD_DEBUG_LEVEL0, "onenand_write: write filaed %d\n", ret);
goto out;
break;
}
/* Only check verify write turn on */
ret = onenand_verify_page(mtd, (u_char *) wbuf, to);
if (ret) {
DEBUG(MTD_DEBUG_LEVEL0, "onenand_write: verify failed %d\n", ret);
break;
}
written += thislen;
/* Only check verify write turn on */
ret = onenand_verify_page(mtd, (u_char *) buf, to);
if (ret) {
DEBUG(MTD_DEBUG_LEVEL0, "onenand_write: verify failed %d\n", ret);
goto out;
}
if (written == len)
break;
column = 0;
to += thislen;
buf += thislen;
}
out:
/* Deselect and wake up anyone waiting on the device */
onenand_release_device(mtd);
@ -2021,23 +2042,30 @@ int onenand_scan(struct mtd_info *mtd, int maxchips)
init_waitqueue_head(&this->wq);
spin_lock_init(&this->chip_lock);
/*
* Allow subpage writes up to oobsize.
*/
switch (mtd->oobsize) {
case 64:
this->ecclayout = &onenand_oob_64;
mtd->subpage_sft = 2;
break;
case 32:
this->ecclayout = &onenand_oob_32;
mtd->subpage_sft = 1;
break;
default:
printk(KERN_WARNING "No OOB scheme defined for oobsize %d\n",
mtd->oobsize);
mtd->subpage_sft = 0;
/* To prevent kernel oops */
this->ecclayout = &onenand_oob_32;
break;
}
this->subpagesize = mtd->writesize >> mtd->subpage_sft;
mtd->ecclayout = this->ecclayout;
/* Fill in remaining MTD driver data */

2
include/linux/mtd/onenand.h
View File

@ -88,6 +88,7 @@ struct onenand_bufferram {
* operation is in progress
* @state: [INTERN] the current state of the OneNAND device
* @page_buf: data buffer
* @subpagesize: [INTERN] holds the subpagesize
* @ecclayout: [REPLACEABLE] the default ecc placement scheme
* @bbm: [REPLACEABLE] pointer to Bad Block Management
* @priv: [OPTIONAL] pointer to private chip date
@ -128,6 +129,7 @@ struct onenand_chip {
onenand_state_t state;
unsigned char *page_buf;
int subpagesize;
struct nand_ecclayout *ecclayout;
void *bbm;