STA_CSR0
reg = rt2500usb_register_read(rt2x00dev, STA_CSR0);
reg = rt2x00mmio_register_read(rt2x00dev, STA_CSR0);
reg = rt2x00mmio_register_read(rt2x00dev, STA_CSR0);
reg = rt2x00usb_register_read(rt2x00dev, STA_CSR0);
reg = rt2x00usb_register_read(rt2x00dev, STA_CSR0);