HOST_CMD_CSR
rt2800_register_write_lock(rt2x00dev, HOST_CMD_CSR, reg);
rt2x00mmio_register_write(rt2x00dev, HOST_CMD_CSR, 0);
reg = rt2x00mmio_register_read(rt2x00dev, HOST_CMD_CSR);
rt2x00mmio_register_write(rt2x00dev, HOST_CMD_CSR, reg);