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[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: Adrian Hunter <ext-adrian.hunter@nokia.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
This commit is contained in:
Adrian Hunter 2007-02-08 10:28:08 +02:00 committed by Kyungmin Park
parent 211ac75f5e
commit cde36b37d6
1 changed files with 17 additions and 9 deletions
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26
drivers/mtd/onenand/onenand_base.c
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@ -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)
{
struct onenand_chip *this = mtd->priv;
int blockpage;
int blockpage, found = 0;
unsigned int i;
blockpage = (int) (addr >> this->page_shift);
@ -585,16 +585,24 @@ static int onenand_check_bufferram(struct mtd_info *mtd, loff_t addr)
/* Is there valid data? */
i = ONENAND_CURRENT_BUFFERRAM(this);
if (this->bufferram[i].blockpage == blockpage)
return 1;
/* Check another BufferRAM */
i = ONENAND_NEXT_BUFFERRAM(this);
if (this->bufferram[i].blockpage == blockpage) {
ONENAND_SET_NEXT_BUFFERRAM(this);
return 1;
found = 1;
else {
/* Check another BufferRAM */
i = ONENAND_NEXT_BUFFERRAM(this);
if (this->bufferram[i].blockpage == blockpage) {
ONENAND_SET_NEXT_BUFFERRAM(this);
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;
}
/**