ADW_SG_BLOCKCNT
newcount = (PAGE_SIZE / (ADW_SG_BLOCKCNT * sizeof(*blocks)));
blocks += ADW_SG_BLOCKCNT;
busaddr += ADW_SG_BLOCKCNT * sizeof(*blocks);
#define ADW_SGSIZE (ADW_NO_OF_SG_PER_BLOCK * ADW_SG_BLOCKCNT)