APCCSR
csr = sbus_readl(chip->port + APCCSR);
sbus_writel(csr, chip->port + APCCSR);
csr = sbus_readl(base->regs + APCCSR);
csr = sbus_readl(base->regs + APCCSR);
sbus_writel(csr, base->regs + APCCSR);
csr = sbus_readl(base->regs + APCCSR);
sbus_writel(csr, base->regs + APCCSR);
sbus_writel(csr, base->regs + APCCSR);