SEC_CSR1
rt2x00mmio_register_write(rt2x00dev, SEC_CSR1, 0x00000000);
rt2x00usb_register_write(rt2x00dev, SEC_CSR1, 0x00000000);
reg = rt2x00usb_register_read(rt2x00dev, SEC_CSR1);
rt2x00usb_register_write(rt2x00dev, SEC_CSR1, reg);