HB_SREG_A9_PWR_REQ
writel(HB_PWR_SUSPEND, sregs_base + HB_SREG_A9_PWR_REQ);
writel(HB_PWR_SHUTDOWN, sregs_base + HB_SREG_A9_PWR_REQ);
writel(HB_PWR_SOFT_RESET, sregs_base + HB_SREG_A9_PWR_REQ);
writel(HB_PWR_HARD_RESET, sregs_base + HB_SREG_A9_PWR_REQ);
writel(~0UL, sregs_base + HB_SREG_A9_PWR_REQ);