CAPS_3
dma_read(CAPS_2, 0), dma_read(CAPS_3, 0),
[CAPS_3] = { 0x0458, 0x00, OMAP_DMA_REG_16BIT },
[CAPS_3] = { 0x0070, 0x00, OMAP_DMA_REG_32BIT },