GT_CONTROL
ctrl = readl(gt_base + GT_CONTROL);
writel_relaxed(ctrl, gt_base + GT_CONTROL);
writel_relaxed(ctrl, gt_base + GT_CONTROL);
ctrl = readl(gt_base + GT_CONTROL);
writel(ctrl, gt_base + GT_CONTROL);
ctrl = readl(gt_base + GT_CONTROL);
writel(GT_CONTROL_TIMER_ENABLE, gt_base + GT_CONTROL);
reg = readl(gt_base + GT_CONTROL);
writel(reg, gt_base + GT_CONTROL);
reg = readl(gt_base + GT_CONTROL);
writel(0, gt_base + GT_CONTROL);
GT_CONTROL_TIMER_ENABLE, gt_base + GT_CONTROL);