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cfi_flash: Support buffered writes on non-standard Spansion NOR flash 

Some NOR flash chip from Spansion, for example, the s29ws-n MirrorBit
series require different addresses for buffered write commands. Define a
configuration option to support buffered writes on those chips. A more
elegant solution would be to automatically detect those chips by parsing
their CFI records, but that would require introduction of a fixup table
into the cfi_flash driver.

Signed-off-by: Guennadi Liakhovetski <lg@denx.de>
This commit is contained in:
Guennadi Liakhovetski 2008-04-03 13:36:02 +02:00 committed by Stefan Roese
parent 950a392464
commit 96ef831f71
2 changed files with 23 additions and 30 deletions
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7
README
View File

@ -2040,6 +2040,13 @@ Configuration Settings:
This option also enables the building of the cfi_flash driver
in the drivers directory
- CFG_FLASH_USE_BUFFER_WRITE
Use buffered writes to flash.
- CONFIG_FLASH_SPANSION_S29WS_N
s29ws-n MirrorBit flash has non-standard addresses for buffered
write commands.
- CFG_FLASH_QUIET_TEST
If this option is defined, the common CFI flash doesn't
print it's warning upon not recognized FLASH banks. This

46
drivers/mtd/cfi_flash.c
View File

@ -844,25 +844,29 @@ static int flash_write_cfibuffer (flash_info_t * info, ulong dest, uchar * cp,
void *dst = map_physmem(dest, len, MAP_NOCACHE);
void *dst2 = dst;
int flag = 0;
uint offset = 0;
unsigned int shift;
switch (info->portwidth) {
case FLASH_CFI_8BIT:
cnt = len;
shift = 0;
break;
case FLASH_CFI_16BIT:
cnt = len >> 1;
shift = 1;
break;
case FLASH_CFI_32BIT:
cnt = len >> 2;
shift = 2;
break;
case FLASH_CFI_64BIT:
cnt = len >> 3;
shift = 3;
break;
default:
retcode = ERR_INVAL;
goto out_unmap;
}
cnt = len >> shift;
while ((cnt-- > 0) && (flag == 0)) {
switch (info->portwidth) {
case FLASH_CFI_8BIT:
@ -906,23 +910,7 @@ static int flash_write_cfibuffer (flash_info_t * info, ulong dest, uchar * cp,
if (retcode == ERR_OK) {
/* reduce the number of loops by the width of
* the port */
switch (info->portwidth) {
case FLASH_CFI_8BIT:
cnt = len;
break;
case FLASH_CFI_16BIT:
cnt = len >> 1;
break;
case FLASH_CFI_32BIT:
cnt = len >> 2;
break;
case FLASH_CFI_64BIT:
cnt = len >> 3;
break;
default:
retcode = ERR_INVAL;
goto out_unmap;
}
cnt = len >> shift;
flash_write_cmd (info, sector, 0, (uchar) cnt - 1);
while (cnt-- > 0) {
switch (info->portwidth) {
@ -959,36 +947,34 @@ static int flash_write_cfibuffer (flash_info_t * info, ulong dest, uchar * cp,
case CFI_CMDSET_AMD_STANDARD:
case CFI_CMDSET_AMD_EXTENDED:
flash_unlock_seq(info,0);
flash_write_cmd (info, sector, 0, AMD_CMD_WRITE_TO_BUFFER);
#ifdef CONFIG_FLASH_SPANSION_S29WS_N
offset = ((unsigned long)dst - info->start[sector]) >> shift;
#endif
flash_write_cmd(info, sector, offset, AMD_CMD_WRITE_TO_BUFFER);
cnt = len >> shift;
flash_write_cmd(info, sector, offset, (uchar)cnt - 1);
switch (info->portwidth) {
case FLASH_CFI_8BIT:
cnt = len;
flash_write_cmd (info, sector, 0, (uchar) cnt - 1);
while (cnt-- > 0) {
flash_write8(flash_read8(src), dst);
src += 1, dst += 1;
}
break;
case FLASH_CFI_16BIT:
cnt = len >> 1;
flash_write_cmd (info, sector, 0, (uchar) cnt - 1);
while (cnt-- > 0) {
flash_write16(flash_read16(src), dst);
src += 2, dst += 2;
}
break;
case FLASH_CFI_32BIT:
cnt = len >> 2;
flash_write_cmd (info, sector, 0, (uchar) cnt - 1);
while (cnt-- > 0) {
flash_write32(flash_read32(src), dst);
src += 4, dst += 4;
}
break;
case FLASH_CFI_64BIT:
cnt = len >> 3;
flash_write_cmd (info, sector, 0, (uchar) cnt - 1);
while (cnt-- > 0) {
flash_write64(flash_read64(src), dst);
src += 8, dst += 8;