IDMAC_DESC_SEGS
#define IDMAC_DESC_SIZE (sizeof(struct idmac_desc) * IDMAC_DESC_SEGS)
#define DWMMC_MAX_DATA (IDMAC_MAX_SIZE * (IDMAC_DESC_SEGS - 2)) / MMC_SECTOR_SIZE
for (idx = 0; idx < IDMAC_DESC_SEGS; idx++) {
nidx = (idx + 1) % IDMAC_DESC_SEGS;
IDMAC_MAX_SIZE * IDMAC_DESC_SEGS, /* maxsize */
IDMAC_DESC_SEGS, /* nsegments */