DMAC_N_DESCS
#define DMAC_DESCS_SIZE (DMAC_N_DESCS * sizeof(struct pxa2x0_dma_desc))
struct dmac_desc sc_all_descs[DMAC_N_DESCS];
sc->sc_free_descs = DMAC_N_DESCS;
for (i = 0; i < DMAC_N_DESCS; i++, dd++) {