USB_DMACHCR
u32 chcr = usb_dmac_chan_read(chan, USB_DMACHCR);
usb_dmac_chan_write(chan, USB_DMACHCR, USB_DMAC_CHCR_TS |
u32 chcr = usb_dmac_chan_read(chan, USB_DMACHCR);
usb_dmac_chan_write(chan, USB_DMACHCR, chcr);
chcr = usb_dmac_chan_read(chan, USB_DMACHCR);
usb_dmac_chan_write(chan, USB_DMACHCR, chcr & ~mask);