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authorKyungmin Park <kyungmin.park@samsung.com>2007-02-02 09:29:36 +0900
committerKyungmin Park <kyungmin.park@samsung.com>2007-02-02 09:29:36 +0900
commitabf3c0f23df6686a984efc8fae7277fcdaffaa32 (patch)
tree201f8fe3ecdb62e5aceba15f00a3bdb13da9e683 /drivers/mtd
parent4f4fad27aceb87621d40f3068b94b5b11fc0127b (diff)
downloadop-kernel-dev-abf3c0f23df6686a984efc8fae7277fcdaffaa32.zip
op-kernel-dev-abf3c0f23df6686a984efc8fae7277fcdaffaa32.tar.gz
[MTD] OneNAND: Reduce internal BufferRAM operations
It use blockpage instead of a pair (block, page). It can also cover a small chunk access. 0x00, 0x20, 0x40 and so on. And in JFFS2 behavior, sometimes it reads two pages alternatively. e.g., It first reads A page, B page and A page. So we check another bufferram to find requested page. Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Diffstat (limited to 'drivers/mtd')
-rw-r--r--drivers/mtd/onenand/onenand_base.c47
1 files changed, 23 insertions, 24 deletions
diff --git a/drivers/mtd/onenand/onenand_base.c b/drivers/mtd/onenand/onenand_base.c
index eb94d94..9f4fe73 100644
--- a/drivers/mtd/onenand/onenand_base.c
+++ b/drivers/mtd/onenand/onenand_base.c
@@ -577,19 +577,22 @@ 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 block, page;
- int i;
+ int blockpage;
+ unsigned int i;
- block = (int) (addr >> this->erase_shift);
- page = (int) (addr >> this->page_shift) & this->page_mask;
+ blockpage = (int) (addr >> this->page_shift);
+ /* Is there valid data? */
i = ONENAND_CURRENT_BUFFERRAM(this);
+ if (this->bufferram[i].blockpage == blockpage)
+ return 1;
- /* Is there valid data? */
- if (this->bufferram[i].block == block &&
- this->bufferram[i].page == page &&
- this->bufferram[i].valid)
+ /* Check another BufferRAM */
+ i = ONENAND_NEXT_BUFFERRAM(this);
+ if (this->bufferram[i].blockpage == blockpage) {
+ ONENAND_SET_NEXT_BUFFERRAM(this);
return 1;
+ }
return 0;
}
@@ -602,30 +605,26 @@ static int onenand_check_bufferram(struct mtd_info *mtd, loff_t addr)
*
* Update BufferRAM information
*/
-static int onenand_update_bufferram(struct mtd_info *mtd, loff_t addr,
+static void onenand_update_bufferram(struct mtd_info *mtd, loff_t addr,
int valid)
{
struct onenand_chip *this = mtd->priv;
- int block, page;
- int i;
+ int blockpage;
+ unsigned int i;
- block = (int) (addr >> this->erase_shift);
- page = (int) (addr >> this->page_shift) & this->page_mask;
+ blockpage = (int) (addr >> this->page_shift);
- /* Invalidate BufferRAM */
- for (i = 0; i < MAX_BUFFERRAM; i++) {
- if (this->bufferram[i].block == block &&
- this->bufferram[i].page == page)
- this->bufferram[i].valid = 0;
- }
+ /* Invalidate another BufferRAM */
+ i = ONENAND_NEXT_BUFFERRAM(this);
+ if (this->bufferram[i].blockpage == blockpage) {
+ this->bufferram[i].blockpage = -1;
/* Update BufferRAM */
i = ONENAND_CURRENT_BUFFERRAM(this);
- this->bufferram[i].block = block;
- this->bufferram[i].page = page;
- this->bufferram[i].valid = valid;
-
- return 0;
+ if (valid)
+ this->bufferram[i].blockpage = blockpage;
+ else
+ this->bufferram[i].blockpage = -1;
}
/**
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