TCQ_WR_PTR
tcq_wr_ptr = readw(iadev->seg_reg+TCQ_WR_PTR);
tcq_wr = readl(dev->seg_reg+TCQ_WR_PTR) & 0xffff;
writew(i+iadev->num_tx_desc*sizeof(u_short),iadev->seg_reg+TCQ_WR_PTR);