wait_until_divider_stable
wait_until_divider_stable(base + regs->div_stat_cpu0, mask);
wait_until_divider_stable(base + regs->div_stat_cpu0, DIV_MASK_ALL);
wait_until_divider_stable(base + regs->div_stat_cpu1,
wait_until_divider_stable(base + regs->div_stat_cpu0, DIV_MASK_ALL);
wait_until_divider_stable(base + regs->div_stat_cpu1, DIV_MASK_ALL);
wait_until_divider_stable(base + regs->divs[i], E850_BUSY_MASK);