CR_ENABLE_BIT_OFFSET
readl(cr_space + CR_ENABLE_BIT_OFFSET) & CR_ENABLE_BIT;
writel(readl(cr_space + CR_ENABLE_BIT_OFFSET) & ~CR_ENABLE_BIT,
cr_space + CR_ENABLE_BIT_OFFSET);
writel(readl(cr_space + CR_ENABLE_BIT_OFFSET) | CR_ENABLE_BIT,
cr_space + CR_ENABLE_BIT_OFFSET);