PDC_CTCR0
ctcr0 = ioread32(dev_mmio(ap, adev, PDC_CTCR0));
iowrite32(ctcr0, dev_mmio(ap, adev, PDC_CTCR0));
ctcr0 = ioread32(dev_mmio(ap, adev, PDC_CTCR0));
iowrite32(ctcr0, dev_mmio(ap, adev, PDC_CTCR0));