SUNXI_MUSB_DEVCTL
devctl = readb(musb->mregs + SUNXI_MUSB_DEVCTL);
writeb(devctl, musb->mregs + SUNXI_MUSB_DEVCTL);
return readb(addr + SUNXI_MUSB_DEVCTL);
return writeb(data, addr + SUNXI_MUSB_DEVCTL);