PCI171X_CTRL_CNT0
devpriv->ctrl &= PCI171X_CTRL_CNT0; /* preserve counter 0 clk src */
devpriv->ctrl &= PCI171X_CTRL_CNT0;
devpriv->ctrl &= PCI171X_CTRL_CNT0;
devpriv->ctrl_ext &= ~PCI171X_CTRL_CNT0;
devpriv->ctrl_ext |= PCI171X_CTRL_CNT0;
if (devpriv->ctrl_ext & PCI171X_CTRL_CNT0) {