REG_GCRBLR
gc_readl(priv, REG_GCRBLR), \
gc_writel(priv, REG_GCRBLR, 0);
gc_readl(priv, REG_GCRBLR),
gc_writel(priv, REG_GCRBLR, 0);
gc_writel(priv, REG_GCRBLR, ((num + 63) & ~63) * 4);
gc_writel(priv, REG_GCRBLR, 0);