diff options
Diffstat (limited to 'src/arch/arm64/include')
| -rw-r--r-- | src/arch/arm64/include/arch/psci.h | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/src/arch/arm64/include/arch/psci.h b/src/arch/arm64/include/arch/psci.h index 555333a44d..b408f3d28c 100644 --- a/src/arch/arm64/include/arch/psci.h +++ b/src/arch/arm64/include/arch/psci.h @@ -104,12 +104,47 @@ static inline int psci_root_node(const struct psci_node *n) return psci_node_parent(n) == NULL; } +enum { + PSCI_CMD_ON, + PSCI_CMD_OFF, + PSCI_CMD_STANDBY, +}; + +/* + * PSCI actions are serialized into a command for the SoC to process. There are + * 2 phases of a command being processed: prepare and commit. The prepare() is + * called with the PSCI locks held for the state of the PSCI nodes. If + * successful, the appropriate locks will be dropped and commit() will be + * called with the same structure. It is permissible for the SoC support code + * to modify the struture passed in (e.g. to update the requested state_id to + * reflect dynamic constraints on how deep of a state to enter). + */ +struct psci_cmd { + /* Command type. */ + int type; + /* + * PSCI state id for PSCI_CMD_OFF and PSCI_CMD_STANDBY commands. + * A value of -1 indicates a CPU_OFF request. + */ + int state_id; + /* + * target is the command's target, but it can affect up to the + * ancestor entity. If target == ancestor then it only affects + * target, otherwise all entites up the hierarchy including ancestor. + */ + struct psci_node *target; + struct psci_node *ancestor; +}; + struct psci_soc_ops { /* * Return number of entities one level below given parent affinitly * level and mpidr. */ size_t (*children_at_level)(int parent_level, uint64_t mpidr); + + int (*cmd_prepare)(struct psci_cmd *cmd); + int (*cmd_commit)(struct psci_cmd *cmd); }; /* Each SoC needs to provide the functions in the psci_soc_ops structure. */ |