diff options
Diffstat (limited to 'lib/psci/psci_common.c')
| -rw-r--r-- | lib/psci/psci_common.c | 33 |
1 files changed, 32 insertions, 1 deletions
diff --git a/lib/psci/psci_common.c b/lib/psci/psci_common.c index 026690d2..1be37c09 100644 --- a/lib/psci/psci_common.c +++ b/lib/psci/psci_common.c @@ -79,7 +79,8 @@ __section("tzfw_coherent_mem") #endif ; -DEFINE_BAKERY_LOCK(psci_locks[PSCI_NUM_NON_CPU_PWR_DOMAINS]); +/* Lock for PSCI state coordination */ +DEFINE_PSCI_LOCK(psci_locks[PSCI_NUM_NON_CPU_PWR_DOMAINS]); cpu_pd_node_t psci_cpu_pd_nodes[PLATFORM_CORE_COUNT]; @@ -992,3 +993,33 @@ int psci_get_suspend_afflvl(void) } #endif + +/******************************************************************************* + * Initiate power down sequence, by calling power down operations registered for + * this CPU. + ******************************************************************************/ +void psci_do_pwrdown_sequence(unsigned int power_level) +{ +#if HW_ASSISTED_COHERENCY + /* + * With hardware-assisted coherency, the CPU drivers only initiate the + * power down sequence, without performing cache-maintenance operations + * in software. Data caches and MMU remain enabled both before and after + * this call. + */ + prepare_cpu_pwr_dwn(power_level); +#else + /* + * Without hardware-assisted coherency, the CPU drivers disable data + * caches and MMU, then perform cache-maintenance operations in + * software. + * + * We ought to call prepare_cpu_pwr_dwn() to initiate power down + * sequence. We currently have data caches and MMU enabled, but the + * function will return with data caches and MMU disabled. We must + * ensure that the stack memory is flushed out to memory before we start + * popping from it again. + */ + psci_do_pwrdown_cache_maintenance(power_level); +#endif +} |