FVP: Implement support for NODE_HW_STATE
This patch implements FVP platform hook to support NODE_HW_STATE PSCI
API. The platform hook validates the given MPIDR and reads corresponding
status from FVP power controller, and returns expected values for the
PSCI call.
Change-Id: I286c92637da11858db2c8aba8ba079389032de6d
diff --git a/plat/arm/board/fvp/fvp_pm.c b/plat/arm/board/fvp/fvp_pm.c
index 3976ef2..66c0c3d 100644
--- a/plat/arm/board/fvp/fvp_pm.c
+++ b/plat/arm/board/fvp/fvp_pm.c
@@ -287,6 +287,42 @@
panic();
}
+static int fvp_node_hw_state(u_register_t target_cpu,
+ unsigned int power_level)
+{
+ unsigned int psysr;
+ int ret;
+
+ /*
+ * The format of 'power_level' is implementation-defined, but 0 must
+ * mean a CPU. We also allow 1 to denote the cluster
+ */
+ if (power_level != ARM_PWR_LVL0 && power_level != ARM_PWR_LVL1)
+ return PSCI_E_INVALID_PARAMS;
+
+ /*
+ * Read the status of the given MPDIR from FVP power controller. The
+ * power controller only gives us on/off status, so map that to expected
+ * return values of the PSCI call
+ */
+ psysr = fvp_pwrc_read_psysr(target_cpu);
+ if (psysr == PSYSR_INVALID)
+ return PSCI_E_INVALID_PARAMS;
+
+ switch (power_level) {
+ case ARM_PWR_LVL0:
+ ret = (psysr & PSYSR_AFF_L0) ? HW_ON : HW_OFF;
+ break;
+ case ARM_PWR_LVL1:
+ ret = (psysr & PSYSR_AFF_L1) ? HW_ON : HW_OFF;
+ break;
+ default:
+ assert(0);
+ }
+
+ return ret;
+}
+
/*******************************************************************************
* Export the platform handlers via plat_arm_psci_pm_ops. The ARM Standard
* platform layer will take care of registering the handlers with PSCI.
@@ -301,5 +337,6 @@
.system_off = fvp_system_off,
.system_reset = fvp_system_reset,
.validate_power_state = arm_validate_power_state,
- .validate_ns_entrypoint = arm_validate_ns_entrypoint
+ .validate_ns_entrypoint = arm_validate_ns_entrypoint,
+ .get_node_hw_state = fvp_node_hw_state
};