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
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@ -287,6 +287,42 @@ static void __dead2 fvp_system_reset(void)
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panic();
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}
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static int fvp_node_hw_state(u_register_t target_cpu,
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unsigned int power_level)
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{
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unsigned int psysr;
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int ret;
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/*
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* The format of 'power_level' is implementation-defined, but 0 must
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* mean a CPU. We also allow 1 to denote the cluster
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*/
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if (power_level != ARM_PWR_LVL0 && power_level != ARM_PWR_LVL1)
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return PSCI_E_INVALID_PARAMS;
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/*
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* Read the status of the given MPDIR from FVP power controller. The
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* power controller only gives us on/off status, so map that to expected
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* return values of the PSCI call
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*/
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psysr = fvp_pwrc_read_psysr(target_cpu);
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if (psysr == PSYSR_INVALID)
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return PSCI_E_INVALID_PARAMS;
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switch (power_level) {
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case ARM_PWR_LVL0:
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ret = (psysr & PSYSR_AFF_L0) ? HW_ON : HW_OFF;
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break;
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case ARM_PWR_LVL1:
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ret = (psysr & PSYSR_AFF_L1) ? HW_ON : HW_OFF;
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break;
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default:
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assert(0);
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}
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return ret;
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}
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/*******************************************************************************
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* Export the platform handlers via plat_arm_psci_pm_ops. The ARM Standard
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* platform layer will take care of registering the handlers with PSCI.
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@ -301,5 +337,6 @@ const plat_psci_ops_t plat_arm_psci_pm_ops = {
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.system_off = fvp_system_off,
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.system_reset = fvp_system_reset,
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.validate_power_state = arm_validate_power_state,
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.validate_ns_entrypoint = arm_validate_ns_entrypoint
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.validate_ns_entrypoint = arm_validate_ns_entrypoint,
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.get_node_hw_state = fvp_node_hw_state
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};
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