PBF_SYS_CTRL
reg = rt2800_register_read(rt2x00dev, PBF_SYS_CTRL);
rt2x00mmio_register_write(rt2x00dev, PBF_SYS_CTRL, 0x00000e1f);
rt2x00mmio_register_write(rt2x00dev, PBF_SYS_CTRL, 0x00000e00);
rt2x00mmio_register_write(rt2x00dev, PBF_SYS_CTRL, reg);
rt2x00mmio_register_write(rt2x00dev, PBF_SYS_CTRL, 0x00000);
rt2x00mmio_register_write(rt2x00dev, PBF_SYS_CTRL, 0x00001);
reg = rt2x00usb_register_read(rt2x00dev, PBF_SYS_CTRL);
rt2x00usb_register_write(rt2x00dev, PBF_SYS_CTRL, reg & ~0x00002000);