haud_buffer_page_dma_addr
req.hdr_hi = haud_buffer_page_dma_addr(buf, 0) >> 16;
req.hdr_lo = haud_buffer_page_dma_addr(buf, 0) & 0xffff;
req.page_nums[i] = haud_buffer_page_dma_addr(buf, i) >> 12;
haud_buffer_page_dma_addr(sc->sc_cmd_req, 0) & 0xffff);
haud_buffer_page_dma_addr(sc->sc_cmd_req, 0) >> 16);
haud_buffer_page_dma_addr(sc->sc_cmd_resp, 0) & 0xffff);
haud_buffer_page_dma_addr(sc->sc_cmd_resp, 0) >> 16);