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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>
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950a392464
commit
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2 changed files with 23 additions and 30 deletions
7
README
7
README
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@ -2040,6 +2040,13 @@ Configuration Settings:
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This option also enables the building of the cfi_flash driver
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in the drivers directory
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- CFG_FLASH_USE_BUFFER_WRITE
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Use buffered writes to flash.
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- CONFIG_FLASH_SPANSION_S29WS_N
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s29ws-n MirrorBit flash has non-standard addresses for buffered
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write commands.
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- CFG_FLASH_QUIET_TEST
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If this option is defined, the common CFI flash doesn't
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print it's warning upon not recognized FLASH banks. This
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@ -844,25 +844,29 @@ static int flash_write_cfibuffer (flash_info_t * info, ulong dest, uchar * cp,
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void *dst = map_physmem(dest, len, MAP_NOCACHE);
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void *dst2 = dst;
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int flag = 0;
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uint offset = 0;
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unsigned int shift;
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switch (info->portwidth) {
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case FLASH_CFI_8BIT:
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cnt = len;
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shift = 0;
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break;
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case FLASH_CFI_16BIT:
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cnt = len >> 1;
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shift = 1;
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break;
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case FLASH_CFI_32BIT:
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cnt = len >> 2;
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shift = 2;
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break;
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case FLASH_CFI_64BIT:
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cnt = len >> 3;
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shift = 3;
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break;
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default:
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retcode = ERR_INVAL;
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goto out_unmap;
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}
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cnt = len >> shift;
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while ((cnt-- > 0) && (flag == 0)) {
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switch (info->portwidth) {
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case FLASH_CFI_8BIT:
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@ -906,23 +910,7 @@ static int flash_write_cfibuffer (flash_info_t * info, ulong dest, uchar * cp,
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if (retcode == ERR_OK) {
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/* reduce the number of loops by the width of
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* the port */
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switch (info->portwidth) {
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case FLASH_CFI_8BIT:
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cnt = len;
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break;
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case FLASH_CFI_16BIT:
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cnt = len >> 1;
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break;
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case FLASH_CFI_32BIT:
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cnt = len >> 2;
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break;
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case FLASH_CFI_64BIT:
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cnt = len >> 3;
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break;
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default:
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retcode = ERR_INVAL;
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goto out_unmap;
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}
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cnt = len >> shift;
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flash_write_cmd (info, sector, 0, (uchar) cnt - 1);
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while (cnt-- > 0) {
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switch (info->portwidth) {
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@ -959,36 +947,34 @@ static int flash_write_cfibuffer (flash_info_t * info, ulong dest, uchar * cp,
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case CFI_CMDSET_AMD_STANDARD:
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case CFI_CMDSET_AMD_EXTENDED:
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flash_unlock_seq(info,0);
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flash_write_cmd (info, sector, 0, AMD_CMD_WRITE_TO_BUFFER);
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#ifdef CONFIG_FLASH_SPANSION_S29WS_N
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offset = ((unsigned long)dst - info->start[sector]) >> shift;
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#endif
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flash_write_cmd(info, sector, offset, AMD_CMD_WRITE_TO_BUFFER);
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cnt = len >> shift;
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flash_write_cmd(info, sector, offset, (uchar)cnt - 1);
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switch (info->portwidth) {
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case FLASH_CFI_8BIT:
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cnt = len;
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flash_write_cmd (info, sector, 0, (uchar) cnt - 1);
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while (cnt-- > 0) {
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flash_write8(flash_read8(src), dst);
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src += 1, dst += 1;
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}
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break;
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case FLASH_CFI_16BIT:
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cnt = len >> 1;
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flash_write_cmd (info, sector, 0, (uchar) cnt - 1);
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while (cnt-- > 0) {
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flash_write16(flash_read16(src), dst);
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src += 2, dst += 2;
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}
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break;
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case FLASH_CFI_32BIT:
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cnt = len >> 2;
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flash_write_cmd (info, sector, 0, (uchar) cnt - 1);
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while (cnt-- > 0) {
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flash_write32(flash_read32(src), dst);
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src += 4, dst += 4;
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}
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break;
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case FLASH_CFI_64BIT:
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cnt = len >> 3;
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flash_write_cmd (info, sector, 0, (uchar) cnt - 1);
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while (cnt-- > 0) {
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flash_write64(flash_read64(src), dst);
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src += 8, dst += 8;
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