PSCI v1.0 introduces a PSCI_FEATURES call that allows to probe for features related to a specific function identifier.
This patch adds PSCI_FEATURES support to the PSCI firmware layer. Signed-off-by: Lorenzo Pieralisi <[email protected]> Cc: Mark Rutland <[email protected]> --- drivers/firmware/psci.c | 6 ++++++ include/uapi/linux/psci.h | 2 ++ 2 files changed, 8 insertions(+) diff --git a/drivers/firmware/psci.c b/drivers/firmware/psci.c index f1579a4..2330099 100644 --- a/drivers/firmware/psci.c +++ b/drivers/firmware/psci.c @@ -196,6 +196,12 @@ static void psci_sys_poweroff(void) invoke_psci_fn(PSCI_0_2_FN_SYSTEM_OFF, 0, 0, 0); } +static int __init psci_features(u32 psci_func_id) +{ + return invoke_psci_fn(PSCI_1_0_FN_PSCI_FEATURES, + psci_func_id, 0, 0); +} + /* * Detect the presence of a resident Trusted OS which may cause CPU_OFF to * return DENIED (which would be fatal). diff --git a/include/uapi/linux/psci.h b/include/uapi/linux/psci.h index 64469e6..187b828d 100644 --- a/include/uapi/linux/psci.h +++ b/include/uapi/linux/psci.h @@ -46,6 +46,8 @@ #define PSCI_0_2_FN64_MIGRATE PSCI_0_2_FN64(5) #define PSCI_0_2_FN64_MIGRATE_INFO_UP_CPU PSCI_0_2_FN64(7) +#define PSCI_1_0_FN_PSCI_FEATURES PSCI_0_2_FN(10) + /* PSCI v0.2 power state encoding for CPU_SUSPEND function */ #define PSCI_0_2_POWER_STATE_ID_MASK 0xffff #define PSCI_0_2_POWER_STATE_ID_SHIFT 0 -- 2.2.1 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
