void wakeup_from_c2(unsigned int cpu)
{
exynos_cpu.power_up(cpu);
update_c2_state(false, cpu);
if (!get_cluster_id(cpu))
exynos_cpu_sequencer_ctrl(false);
}
int enter_c2(unsigned int cpu, int index, int *sub_state)
{
exynos_cpu.power_down(cpu);
spin_lock(&c2_lock);
update_c2_state(true, cpu);
/*
* This function determines whether to power down the cluster/enter LPC
* or not. If idle time is not enough, skip this routine.
*/
if (get_next_event_time_us(cpu) < min(cpd_residency, lpc_residency))
goto out;
/*
* If LPC is available, write flag to internal RAM. By this, know whether
* AP put into LPC or not in EL3 PSCI handler.
*/
if (
#ifdef CONFIG_SOC_EXYNOS7420
get_cluster_id(cpu) &&
#endif
is_lpc_available(lpc_residency)) {
exynos_ss_cpuidle(EXYNOS_SS_LPC_INDEX, 0, 0, ESS_FLAG_IN);
#ifdef CONFIG_SOC_EXYNOS7420
write_lpc_flag(ENTER_LPC);
*sub_state |= LPC_STATE;
#endif
s3c24xx_serial_fifo_wait();
}
/*
* Power down of LITTLE cluster have nothing to gain power consumption,
* so does not support. For you reference, cluster id "1" indicates LITTLE.
*/
if (get_cluster_id(cpu))
goto out;
/* If cluster is not busy, enable cpu sequcner to shutdown cluster */
if (!is_cpus_busy(cpd_residency, cpu_coregroup_mask(cpu))) {
exynos_cpu_sequencer_ctrl(true);
*sub_state |= CPD_STATE;
index++;
}
out:
spin_unlock(&c2_lock);
return index;
}
void wakeup_from_c2(unsigned int cpu)
{
exynos_cpu.power_up(cpu);
spin_lock(&cpd_lock);
update_cpd_state(false, cpu);
if (is_in_boot_cluster(cpu))
goto unlock;
exynos_cpu_sequencer_ctrl(false);
unlock:
spin_unlock(&cpd_lock);
}
int determine_cpd(int index, int c2_index, unsigned int cpu,
unsigned int target_residency)
{
exynos_cpu.power_down(cpu);
if (index == c2_index)
return c2_index;
#ifdef CONFIG_ARM_EXYNOS_SMP_CPUFREQ
if (disabled_cluster_power_down)
return c2_index;
#endif
spin_lock(&cpd_lock);
update_cpd_state(true, cpu);
if (is_lpc_available(target_residency)) {
set_lpc_flag();
s3c24xx_serial_fifo_wait();
}
if (is_in_boot_cluster(cpu)) {
index = c2_index;
goto unlock;
}
if (is_busy(target_residency, cpu_coregroup_mask(cpu)))
index = c2_index;
else
exynos_cpu_sequencer_ctrl(true);
unlock:
spin_unlock(&cpd_lock);
return index;
}
