PCH_BUF_SIZE
cnt = (data->cur_trans->len - 1) / PCH_BUF_SIZE + 1;
dma_free_coherent(&board_dat->pdev->dev, PCH_BUF_SIZE,
dma_free_coherent(&board_dat->pdev->dev, PCH_BUF_SIZE,
PCH_BUF_SIZE, &dma->tx_buf_dma, GFP_KERNEL);
PCH_BUF_SIZE, &dma->rx_buf_dma, GFP_KERNEL);
if (data->bpw_len > PCH_BUF_SIZE) {
data->bpw_len = PCH_BUF_SIZE;
data->cur_trans->len -= PCH_BUF_SIZE;