SSIFTDR
ssi->dma_dais[SNDRV_PCM_STREAM_PLAYBACK].addr = (dma_addr_t)res->start + SSIFTDR;
rz_ssi_reg_writel(ssi, SSIFTDR, ((u32)(*buf++) << 16));
rz_ssi_reg_writel(ssi, SSIFTDR, *buf++);