ASD_DDB_SIZE
asd_ha->hw_prof.max_ddbs = asd_get_devctx_size(asd_ha)/ASD_DDB_SIZE;
#define MAX_DEVS ((OCM_MAX_SIZE) / (ASD_DDB_SIZE))
dma_addr -= asd_ha->hw_prof.max_ddbs * ASD_DDB_SIZE;
size = (max_devs - asd_ha->hw_prof.max_ddbs + 1) * ASD_DDB_SIZE;
dma_addr = ALIGN((unsigned long) dma_handle, ASD_DDB_SIZE);
dma_addr -= asd_ha->hw_prof.max_ddbs * ASD_DDB_SIZE;