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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
This commit is contained in:
Jeenu Viswambharan 2016-08-04 09:43:15 +01:00
parent 28d3d614b5
commit 1298ae0234
1 changed files with 38 additions and 1 deletions
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39
plat/arm/board/fvp/fvp_pm.c
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@ -287,6 +287,42 @@ static void __dead2 fvp_system_reset(void)
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 @@ const plat_psci_ops_t plat_arm_psci_pm_ops = {
.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
};