diff options
| author | Adrian Hunter <ext-adrian.hunter@nokia.com> | 2007-02-08 10:28:08 +0200 |
|---|---|---|
| committer | Kyungmin Park <kyungmin.park@samsung.com> | 2007-02-09 09:42:42 +0900 |
| commit | cde36b37d6fa5ebc8c95461a972c379185626b2c (patch) | |
| tree | 44c8ac5875119e42ddc44780b759f610d361495c /drivers/mtd | |
| parent | 211ac75f5e867ab7a54811a514814149caca42c3 (diff) | |
| download | linux-cde36b37d6fa5ebc8c95461a972c379185626b2c.tar.bz2 | |
[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')
| -rw-r--r-- | drivers/mtd/onenand/onenand_base.c | 24 |
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; } /** |