/*
* Handle block mark swapping.
*
* Note that, when this function is called, it doesn't know whether it's
* swapping the block mark, or swapping it *back* -- but it doesn't matter
* because the the operation is the same.
*/
static void mxs_nand_swap_block_mark(struct mtd_info *mtd,
uint8_t *data_buf, uint8_t *oob_buf)
{
uint32_t bit_offset;
uint32_t buf_offset;
uint32_t src;
uint32_t dst;
bit_offset = mxs_nand_mark_bit_offset(mtd);
buf_offset = mxs_nand_mark_byte_offset(mtd);
/*
* Get the byte from the data area that overlays the block mark. Since
* the ECC engine applies its own view to the bits in the page, the
* physical block mark won't (in general) appear on a byte boundary in
* the data.
*/
src = data_buf[buf_offset] >> bit_offset;
src |= data_buf[buf_offset + 1] << (8 - bit_offset);
dst = oob_buf[0];
oob_buf[0] = src;
data_buf[buf_offset] &= ~(0xff << bit_offset);
data_buf[buf_offset + 1] &= 0xff << bit_offset;
data_buf[buf_offset] |= dst << bit_offset;
data_buf[buf_offset + 1] |= dst >> (8 - bit_offset);
}
static int fcb_create(struct imx_nand_fcb_bbu_handler *imx_handler,
struct fcb_block *fcb, struct mtd_info *mtd)
{
fcb->FingerPrint = 0x20424346;
fcb->Version = 0x01000000;
fcb->PageDataSize = mtd->writesize;
fcb->TotalPageSize = mtd->writesize + mtd->oobsize;
fcb->SectorsPerBlock = mtd->erasesize / mtd->writesize;
/* Divide ECC strength by two and save the value into FCB structure. */
fcb->EccBlock0EccType =
mxs_nand_get_ecc_strength(mtd->writesize, mtd->oobsize) >> 1;
fcb->EccBlockNEccType = fcb->EccBlock0EccType;
fcb->EccBlock0Size = 0x00000200;
fcb->EccBlockNSize = 0x00000200;
fcb->NumEccBlocksPerPage = mtd->writesize / fcb->EccBlock0Size - 1;
/* DBBT search area starts at second page on first block */
fcb->DBBTSearchAreaStartAddress = 1;
fcb->BadBlockMarkerByte = mxs_nand_mark_byte_offset(mtd);
fcb->BadBlockMarkerStartBit = mxs_nand_mark_bit_offset(mtd);
fcb->BBMarkerPhysicalOffset = mtd->writesize;
imx_handler->fcb_create(imx_handler, fcb, mtd);
fcb->Checksum = calc_chksum((void *)fcb + 4, sizeof(*fcb) - 4);
return 0;
}
