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OneNAND: handle byte access on BufferRAM 

Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
This commit is contained in:
Kyungmin Park 2006-05-12 17:02:31 +03:00 committed by Jarkko Lavinen
parent 628bee6593
commit 9c01f87db1
2 changed files with 41 additions and 0 deletions
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38
drivers/mtd/onenand/onenand_base.c
View File

@ -373,6 +373,17 @@ static int onenand_read_bufferram(struct mtd_info *mtd, int area,
bufferram += onenand_bufferram_offset(mtd, area);
if (ONENAND_CHECK_BYTE_ACCESS(count)) {
unsigned short word;
/* Align with word(16-bit) size */
count--;
/* Read word and save byte */
word = this->read_word(bufferram + offset + count);
buffer[count] = (word & 0xff);
}
memcpy(buffer, bufferram + offset, count);
return 0;
@ -400,6 +411,17 @@ static int onenand_sync_read_bufferram(struct mtd_info *mtd, int area,
this->mmcontrol(mtd, ONENAND_SYS_CFG1_SYNC_READ);
if (ONENAND_CHECK_BYTE_ACCESS(count)) {
unsigned short word;
/* Align with word(16-bit) size */
count--;
/* Read word and save byte */
word = this->read_word(bufferram + offset + count);
buffer[count] = (word & 0xff);
}
memcpy(buffer, bufferram + offset, count);
this->mmcontrol(mtd, 0);
@ -427,6 +449,22 @@ static int onenand_write_bufferram(struct mtd_info *mtd, int area,
bufferram += onenand_bufferram_offset(mtd, area);
if (ONENAND_CHECK_BYTE_ACCESS(count)) {
unsigned short word;
int byte_offset;
/* Align with word(16-bit) size */
count--;
/* Calculate byte access offset */
byte_offset = offset + count;
/* Read word and save byte */
word = this->read_word(bufferram + byte_offset);
word = (word & ~0xff) | buffer[count];
this->write_word(word, bufferram + byte_offset);
}
memcpy(bufferram + offset, buffer, count);
return 0;

3
include/linux/mtd/onenand.h
View File

@ -130,6 +130,9 @@ struct onenand_chip {
#define ONENAND_SET_SYS_CFG1(v, this) \
(this->write_word(v, this->base + ONENAND_REG_SYS_CFG1))
/* Check byte access in OneNAND */
#define ONENAND_CHECK_BYTE_ACCESS(addr) (addr & 0x1)
/*
* Options bits
*/