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Chips like the SST SST25VF080B can only handle single byte writes outside AAI mode

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Change SPI architecture to handle 1-byte chunk chip writing differently
from 256-byte chunk chip writing.

Annotate SPI chip write functions with _256 or _1 suffix denoting the
number of bytes they write at maximum.

The 1-byte chunk writing is cut-n-pasted to different SPI drivers right
now. A later patch can move them to the generic spi_chip_write_1.

Corresponding to flashrom svn r485.

Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
This commit is contained in:
Carl-Daniel Hailfinger
2009-05-09 02:30:21 +00:00
parent 03adbe1269
commit 96930c3952
6 changed files with 50 additions and 16 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
it87spi.c
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@ -219,10 +219,12 @@ static int it8716f_spi_page_program(int block, uint8_t *buf, uint8_t *bios)
}
/*
* IT8716F only allows maximum of 512 kb SPI mapped to LPC memory cycles
* Program chip using firmware cycle byte programming. (SLOW!)
* This is for chips which can only handle one byte writes
* and for chips where memory mapped programming is impossible due to
* size constraints in IT87* (over 512 kB)
*/
int it8716f_over512k_spi_chip_write(struct flashchip *flash, uint8_t *buf)
int it8716f_spi_chip_write_1(struct flashchip *flash, uint8_t *buf)
{
int total_size = 1024 * flash->total_size;
int i;
@ -269,13 +271,17 @@ int it8716f_spi_chip_read(struct flashchip *flash, uint8_t *buf)
return 0;
}
int it8716f_spi_chip_write(struct flashchip *flash, uint8_t *buf)
int it8716f_spi_chip_write_256(struct flashchip *flash, uint8_t *buf)
{
int total_size = 1024 * flash->total_size;
int i;
/*
* IT8716F only allows maximum of 512 kb SPI chip size for memory
* mapped access.
*/
if (total_size > 512 * 1024) {
it8716f_over512k_spi_chip_write(flash, buf);
it8716f_spi_chip_write_1(flash, buf);
} else {
for (i = 0; i < total_size / 256; i++) {
it8716f_spi_page_program(i, buf,