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authorAdrian Hunter <ext-adrian.hunter@nokia.com>2007-02-08 10:28:08 +0200
committerKyungmin Park <kyungmin.park@samsung.com>2007-02-09 09:42:42 +0900
commitcde36b37d6fa5ebc8c95461a972c379185626b2c (patch)
tree44c8ac5875119e42ddc44780b759f610d361495c /drivers/mtd/onenand
parent211ac75f5e867ab7a54811a514814149caca42c3 (diff)
[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>
Diffstat (limited to 'drivers/mtd/onenand')
-rw-r--r--drivers/mtd/onenand/onenand_base.c24
1 files changed, 16 insertions, 8 deletions
diff --git a/drivers/mtd/onenand/onenand_base.c b/drivers/mtd/onenand/onenand_base.c
index f690c1916d1d..779327b845d1 100644
--- a/drivers/mtd/onenand/onenand_base.c
+++ b/drivers/mtd/onenand/onenand_base.c
@@ -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;
+ found = 1;
+ else {
+ /* Check another BufferRAM */
+ i = ONENAND_NEXT_BUFFERRAM(this);
+ if (this->bufferram[i].blockpage == blockpage) {
+ ONENAND_SET_NEXT_BUFFERRAM(this);
+ found = 1;
+ }
+ }
- /* Check another BufferRAM */
- i = ONENAND_NEXT_BUFFERRAM(this);
- if (this->bufferram[i].blockpage == blockpage) {
- ONENAND_SET_NEXT_BUFFERRAM(this);
- return 1;
+ 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 0;
+ return found;
}
/**