CSAC
[CSAC] = { 0x0018, 0x40, OMAP_DMA_REG_16BIT },
offset = p->dma_read(CSAC, lch);
offset = p->dma_read(CSAC, lch);
offset = p->dma_read(CSAC, lch);
[CSAC] = { 0x00b4, 0x60, OMAP_DMA_REG_32BIT },
addr = omap_dma_chan_read_3_3(c, CSAC);