static int load_sdata(uffs_Device *dev, int block, int page)
{
uffs_FileEmu *emu = (uffs_FileEmu *)(dev->attr->_private);
int abs_page;
struct uffs_StorageAttrSt *attr = dev->attr;
int nread;
int ret;
u8 ecc_buf[RS_ECC_SIZE];
u8 *ecc_store;
abs_page = attr->pages_per_block * block + page;
fseek(emu->fp, abs_page * PAGE_FULL_SIZE, SEEK_SET);
nread = fread(g_sdata_buf, 1, PAGE_FULL_SIZE, emu->fp);
g_sdata_buf_pointer = 0;
ret = ((nread == PAGE_FULL_SIZE) ? UFFS_FLASH_NO_ERR : UFFS_FLASH_IO_ERR);
if (ret == UFFS_FLASH_NO_ERR) {
// Perform ECC check & correction
// In the real world, this is done by MLC controller hardware
memset(ecc_buf, 0xFF, RS_ECC_SIZE);
uffs_EccMake(g_sdata_buf, attr->page_data_size, ecc_buf);
ecc_store = g_sdata_buf + PAGE_FULL_SIZE - RS_ECC_SIZE;
ret = uffs_EccCorrect(g_sdata_buf, attr->page_data_size, ecc_store, ecc_buf);
ret = (ret < 0 ? UFFS_FLASH_ECC_FAIL :
(ret > 0 ? UFFS_FLASH_ECC_OK : UFFS_FLASH_NO_ERR));
}
return ret;
}
/**
* Read page data to buf (do ECC error correction if needed)
* \param[in] dev uffs device
* \param[in] block flash block num
* \param[in] page flash page num of the block
* \param[out] buf holding the read out data
* \param[in] skip_ecc skip ecc when reading data from flash
*
* \return #UFFS_FLASH_NO_ERR: success and/or has no flip bits.
* #UFFS_FLASH_IO_ERR: I/O error, expect retry ?
* #UFFS_FLASH_ECC_FAIL: spare data has flip bits and ecc correct failed.
* #UFFS_FLASH_ECC_OK: spare data has flip bits and corrected by ecc.
* #UFFS_FLASH_CRC_ERR: CRC verification failed.
* #UFFS_FLASH_UNKNOWN_ERR:
*
* \note if skip_ecc is U_TRUE, skip CRC as well.
*/
int uffs_FlashReadPage(uffs_Device *dev, int block, int page, uffs_Buf *buf, UBOOL skip_ecc)
{
uffs_FlashOps *ops = dev->ops;
struct uffs_StorageAttrSt *attr = dev->attr;
int size = dev->com.pg_size;
u8 ecc_buf[UFFS_MAX_ECC_SIZE];
u8 ecc_store[UFFS_MAX_ECC_SIZE];
UBOOL is_bad = U_FALSE;
#ifdef CONFIG_ENABLE_PAGE_DATA_CRC
UBOOL crc_ok = U_TRUE;
#endif
u8 * spare;
int ret = UFFS_FLASH_UNKNOWN_ERR;
spare = (u8 *) uffs_PoolGet(SPOOL(dev));
if (spare == NULL)
goto ext;
if (ops->ReadPageWithLayout) {
if (skip_ecc)
ret = ops->ReadPageWithLayout(dev, block, page, buf->header, size, NULL, NULL, NULL);
else
ret = ops->ReadPageWithLayout(dev, block, page, buf->header, size, ecc_buf, NULL, ecc_store);
}
else {
if (skip_ecc)
ret = ops->ReadPage(dev, block, page, buf->header, size, NULL, NULL, 0);
else
ret = ops->ReadPage(dev, block, page, buf->header, size, ecc_buf, spare, dev->mem.spare_data_size);
}
if (UFFS_FLASH_IS_BAD_BLOCK(ret))
is_bad = U_TRUE;
if (UFFS_FLASH_HAVE_ERR(ret))
goto ext;
#ifdef CONFIG_ENABLE_PAGE_DATA_CRC
if (!skip_ecc) {
crc_ok = (HEADER(buf)->crc == uffs_crc16sum(buf->data, size - sizeof(struct uffs_MiniHeaderSt)) ? U_TRUE : U_FALSE);
if (crc_ok)
goto ext; // CRC is matched, no need to do ECC correction.
else {
if (dev->attr->ecc_opt == UFFS_ECC_NONE || dev->attr->ecc_opt == UFFS_ECC_HW_AUTO) {
// ECC is not enabled or ecc correction already done, error return immediately,
// otherwise, we try CRC check again after ecc correction.
ret = UFFS_FLASH_CRC_ERR;
goto ext;
}
}
}
#endif
// make ECC for UFFS_ECC_SOFT
if (attr->ecc_opt == UFFS_ECC_SOFT && !skip_ecc)
uffs_EccMake(buf->header, size, ecc_buf);
// unload ecc_store if driver doesn't do the layout
if (ops->ReadPageWithLayout == NULL) {
if (!skip_ecc && (attr->ecc_opt == UFFS_ECC_SOFT || attr->ecc_opt == UFFS_ECC_HW))
uffs_FlashUnloadSpare(dev, spare, NULL, ecc_store);
}
// check page data ecc
if (!skip_ecc && (dev->attr->ecc_opt == UFFS_ECC_SOFT || dev->attr->ecc_opt == UFFS_ECC_HW)) {
ret = uffs_EccCorrect(buf->header, size, ecc_store, ecc_buf);
ret = (ret < 0 ? UFFS_FLASH_ECC_FAIL :
(ret > 0 ? UFFS_FLASH_ECC_OK : UFFS_FLASH_NO_ERR));
if (UFFS_FLASH_IS_BAD_BLOCK(ret))
is_bad = U_TRUE;
if (UFFS_FLASH_HAVE_ERR(ret))
goto ext;
}
#ifdef CONFIG_ENABLE_PAGE_DATA_CRC
if (!skip_ecc && !UFFS_FLASH_HAVE_ERR(ret)) {
// Everything seems ok, do CRC check again.
if (HEADER(buf)->crc == uffs_crc16sum(buf->data, size - sizeof(struct uffs_MiniHeaderSt))) {
ret = UFFS_FLASH_CRC_ERR;
goto ext;
}
}
#endif
ext:
switch(ret) {
case UFFS_FLASH_IO_ERR:
uffs_Perror(UFFS_MSG_NORMAL, "Read block %d page %d I/O error", block, page);
break;
case UFFS_FLASH_ECC_FAIL:
uffs_Perror(UFFS_MSG_NORMAL, "Read block %d page %d ECC failed", block, page);
ret = UFFS_FLASH_BAD_BLK; // treat ECC FAIL as BAD BLOCK
is_bad = U_TRUE;
break;
case UFFS_FLASH_ECC_OK:
uffs_Perror(UFFS_MSG_NORMAL, "Read block %d page %d bit flip corrected by ECC", block, page);
break;
case UFFS_FLASH_BAD_BLK:
uffs_Perror(UFFS_MSG_NORMAL, "Read block %d page %d BAD BLOCK found", block, page);
break;
case UFFS_FLASH_UNKNOWN_ERR:
uffs_Perror(UFFS_MSG_NORMAL, "Read block %d page %d UNKNOWN error!", block, page);
break;
case UFFS_FLASH_CRC_ERR:
uffs_Perror(UFFS_MSG_NORMAL, "Read block %d page %d CRC failed", block, page);
break;
default:
break;
}
if (is_bad)
uffs_BadBlockAdd(dev, block);
if (spare)
uffs_PoolPut(SPOOL(dev), spare);
return ret;
}
