Commit cde36b37 authored by Adrian Hunter's avatar Adrian Hunter Committed by Kyungmin Park

[MTD] OneNAND: Select correct chip's bufferRAM for DDP

OneNAND double-density package (DDP) has two chips, each with
their own bufferRAM.  The driver will skip loading data from
the NAND core if the data can be found in a bufferRAM, however
in that case, the correct chip's bufferRAM must be selected
before reading from bufferRAM.
Signed-off-by: default avatarAdrian Hunter <ext-adrian.hunter@nokia.com>
Signed-off-by: default avatarKyungmin Park <kyungmin.park@samsung.com>
parent 211ac75f
...@@ -577,7 +577,7 @@ static int onenand_write_bufferram(struct mtd_info *mtd, int area, ...@@ -577,7 +577,7 @@ static int onenand_write_bufferram(struct mtd_info *mtd, int area,
static int onenand_check_bufferram(struct mtd_info *mtd, loff_t addr) static int onenand_check_bufferram(struct mtd_info *mtd, loff_t addr)
{ {
struct onenand_chip *this = mtd->priv; struct onenand_chip *this = mtd->priv;
int blockpage; int blockpage, found = 0;
unsigned int i; unsigned int i;
blockpage = (int) (addr >> this->page_shift); blockpage = (int) (addr >> this->page_shift);
...@@ -585,16 +585,24 @@ static int onenand_check_bufferram(struct mtd_info *mtd, loff_t addr) ...@@ -585,16 +585,24 @@ static int onenand_check_bufferram(struct mtd_info *mtd, loff_t addr)
/* Is there valid data? */ /* Is there valid data? */
i = ONENAND_CURRENT_BUFFERRAM(this); i = ONENAND_CURRENT_BUFFERRAM(this);
if (this->bufferram[i].blockpage == blockpage) if (this->bufferram[i].blockpage == blockpage)
return 1; found = 1;
else {
/* Check another BufferRAM */ /* Check another BufferRAM */
i = ONENAND_NEXT_BUFFERRAM(this); i = ONENAND_NEXT_BUFFERRAM(this);
if (this->bufferram[i].blockpage == blockpage) { if (this->bufferram[i].blockpage == blockpage) {
ONENAND_SET_NEXT_BUFFERRAM(this); ONENAND_SET_NEXT_BUFFERRAM(this);
return 1; found = 1;
}
} }
return 0; if (found && ONENAND_IS_DDP(this)) {
/* Select DataRAM for DDP */
int block = (int) (addr >> this->erase_shift);
int value = onenand_bufferram_address(this, block);
this->write_word(value, this->base + ONENAND_REG_START_ADDRESS2);
}
return found;
} }
/** /**
......
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