OHCI_DMACTL
OWRITE(sc, OHCI_DMACTL(dbch->off), OHCI_CNTL_DMA_WAKE);
OREAD(sc, OHCI_DMACTL(dbch->off)));
OWRITE(sc, OHCI_DMACTL(dbch->off), OHCI_CNTL_DMA_RUN);
OWRITE(sc, OHCI_DMACTL(dbch->off), OHCI_CNTL_DMA_RUN);
OWRITE(sc, OHCI_DMACTL(dbch->off), OHCI_CNTL_DMA_WAKE);
len, OREAD(sc, OHCI_DMACTL(dbch->off)),
OREAD(sc, OHCI_DMACTL(dbch->off)));
OWRITE(sc, OHCI_DMACTL(dbch->off), OHCI_CNTL_DMA_WAKE);