MU3D_EP_RXCR0
csr = mtu3_readl(mbase, MU3D_EP_RXCR0(epnum)) & RX_W1C_BITS;
mtu3_writel(mbase, MU3D_EP_RXCR0(epnum), csr);
mtu3_writel(mbase, MU3D_EP_RXCR0(epnum), csr0);
epnum, mtu3_readl(mbase, MU3D_EP_RXCR0(epnum)),
mtu3_writel(mbase, MU3D_EP_RXCR0(epnum), 0);
regs[0].offset = in ? MU3D_EP_TXCR0(epnum) : MU3D_EP_RXCR0(epnum);
mtu3_setbits(mbase, MU3D_EP_RXCR0(epnum), RX_DMAREQEN);