CSR18
tmp = ioread32(ioaddr + CSR18);
iowrite32(tmp, ioaddr + CSR18);
reg = rt2x00mmio_register_read(rt2x00dev, CSR18);
rt2x00mmio_register_write(rt2x00dev, CSR18, reg);
reg = rt2x00mmio_register_read(rt2x00dev, CSR18);
rt2x00mmio_register_write(rt2x00dev, CSR18, reg);