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[MTD] OneNAND: Reduce internal BufferRAM operations

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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>
This commit is contained in:
Kyungmin Park 2007-02-02 09:29:36 +09:00
parent 4f4fad27ac
commit abf3c0f23d
2 changed files with 26 additions and 31 deletions
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49
drivers/mtd/onenand/onenand_base.c
View file

@ -577,20 +577,23 @@ 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;
i = ONENAND_CURRENT_BUFFERRAM(this);
blockpage = (int) (addr >> this->page_shift);
/* Is there valid data? */
if (this->bufferram[i].block == block &&
this->bufferram[i].page == page &&
this->bufferram[i].valid)
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;
}
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;
}
/**

8
include/linux/mtd/onenand.h
View file

@ -42,14 +42,10 @@ typedef enum {
/**
* struct onenand_bufferram - OneNAND BufferRAM Data
* @block: block address in BufferRAM
* @page: page address in BufferRAM
* @valid: valid flag
* @blockpage: block & page address in BufferRAM
*/
struct onenand_bufferram {
int block;
int page;
int valid;
int blockpage;
};
/**