FHC_PREGS_CTRL
(p->pregs + FHC_PREGS_CTRL);
reg = upa_readl(p->pregs + FHC_PREGS_CTRL);
upa_writel(reg, p->pregs + FHC_PREGS_CTRL);
upa_readl(p->pregs + FHC_PREGS_CTRL);