/* * Copyright (c) 2013-2016, ARM Limited and Contributors. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * Redistributions of source code must retain the above copyright notice, this * list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * * Neither the name of ARM nor the names of its contributors may be used * to endorse or promote products derived from this software without specific * prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #include #include #include #include #include #include #include #include #include "psci_private.h" /******************************************************************************* * PSCI frontend api for servicing SMCs. Described in the PSCI spec. ******************************************************************************/ int psci_cpu_on(u_register_t target_cpu, uintptr_t entrypoint, u_register_t context_id) { int rc; entry_point_info_t ep; /* Determine if the cpu exists of not */ rc = psci_validate_mpidr(target_cpu); if (rc != PSCI_E_SUCCESS) return PSCI_E_INVALID_PARAMS; /* Validate the entry point and get the entry_point_info */ rc = psci_validate_entry_point(&ep, entrypoint, context_id); if (rc != PSCI_E_SUCCESS) return rc; /* * To turn this cpu on, specify which power * levels need to be turned on */ return psci_cpu_on_start(target_cpu, &ep); } unsigned int psci_version(void) { return PSCI_MAJOR_VER | PSCI_MINOR_VER; } int psci_cpu_suspend(unsigned int power_state, uintptr_t entrypoint, u_register_t context_id) { int rc; unsigned int target_pwrlvl, is_power_down_state; entry_point_info_t ep; psci_power_state_t state_info = { {PSCI_LOCAL_STATE_RUN} }; plat_local_state_t cpu_pd_state; /* Validate the power_state parameter */ rc = psci_validate_power_state(power_state, &state_info); if (rc != PSCI_E_SUCCESS) { assert(rc == PSCI_E_INVALID_PARAMS); return rc; } /* * Get the value of the state type bit from the power state parameter. */ is_power_down_state = psci_get_pstate_type(power_state); /* Sanity check the requested suspend levels */ assert(psci_validate_suspend_req(&state_info, is_power_down_state) == PSCI_E_SUCCESS); target_pwrlvl = psci_find_target_suspend_lvl(&state_info); /* Fast path for CPU standby.*/ if (is_cpu_standby_req(is_power_down_state, target_pwrlvl)) { if (!psci_plat_pm_ops->cpu_standby) return PSCI_E_INVALID_PARAMS; /* * Set the state of the CPU power domain to the platform * specific retention state and enter the standby state. */ cpu_pd_state = state_info.pwr_domain_state[PSCI_CPU_PWR_LVL]; psci_set_cpu_local_state(cpu_pd_state); #if ENABLE_PSCI_STAT /* * Capture time-stamp before CPU standby * No cache maintenance is needed as caches * are ON through out the CPU standby operation. */ PMF_CAPTURE_TIMESTAMP(psci_svc, PSCI_STAT_ID_ENTER_LOW_PWR, PMF_NO_CACHE_MAINT); #endif psci_plat_pm_ops->cpu_standby(cpu_pd_state); /* Upon exit from standby, set the state back to RUN. */ psci_set_cpu_local_state(PSCI_LOCAL_STATE_RUN); #if ENABLE_PSCI_STAT /* Capture time-stamp after CPU standby */ PMF_CAPTURE_TIMESTAMP(psci_svc, PSCI_STAT_ID_EXIT_LOW_PWR, PMF_NO_CACHE_MAINT); /* Update PSCI stats */ psci_stats_update_pwr_up(PSCI_CPU_PWR_LVL, &state_info, PMF_NO_CACHE_MAINT); #endif return PSCI_E_SUCCESS; } /* * If a power down state has been requested, we need to verify entry * point and program entry information. */ if (is_power_down_state) { rc = psci_validate_entry_point(&ep, entrypoint, context_id); if (rc != PSCI_E_SUCCESS) return rc; } /* * Do what is needed to enter the power down state. Upon success, * enter the final wfi which will power down this CPU. This function * might return if the power down was abandoned for any reason, e.g. * arrival of an interrupt */ psci_cpu_suspend_start(&ep, target_pwrlvl, &state_info, is_power_down_state); return PSCI_E_SUCCESS; } int psci_system_suspend(uintptr_t entrypoint, u_register_t context_id) { int rc; psci_power_state_t state_info; entry_point_info_t ep; /* Check if the current CPU is the last ON CPU in the system */ if (!psci_is_last_on_cpu()) return PSCI_E_DENIED; /* Validate the entry point and get the entry_point_info */ rc = psci_validate_entry_point(&ep, entrypoint, context_id); if (rc != PSCI_E_SUCCESS) return rc; /* Query the psci_power_state for system suspend */ psci_query_sys_suspend_pwrstate(&state_info); /* Ensure that the psci_power_state makes sense */ assert(psci_find_target_suspend_lvl(&state_info) == PLAT_MAX_PWR_LVL); assert(psci_validate_suspend_req(&state_info, PSTATE_TYPE_POWERDOWN) == PSCI_E_SUCCESS); assert(is_local_state_off(state_info.pwr_domain_state[PLAT_MAX_PWR_LVL])); /* * Do what is needed to enter the system suspend state. This function * might return if the power down was abandoned for any reason, e.g. * arrival of an interrupt */ psci_cpu_suspend_start(&ep, PLAT_MAX_PWR_LVL, &state_info, PSTATE_TYPE_POWERDOWN); return PSCI_E_SUCCESS; } int psci_cpu_off(void) { int rc; unsigned int target_pwrlvl = PLAT_MAX_PWR_LVL; /* * Do what is needed to power off this CPU and possible higher power * levels if it able to do so. Upon success, enter the final wfi * which will power down this CPU. */ rc = psci_do_cpu_off(target_pwrlvl); /* * The only error cpu_off can return is E_DENIED. So check if that's * indeed the case. */ assert(rc == PSCI_E_DENIED); return rc; } int psci_affinity_info(u_register_t target_affinity, unsigned int lowest_affinity_level) { unsigned int target_idx; /* We dont support level higher than PSCI_CPU_PWR_LVL */ if (lowest_affinity_level > PSCI_CPU_PWR_LVL) return PSCI_E_INVALID_PARAMS; /* Calculate the cpu index of the target */ target_idx = plat_core_pos_by_mpidr(target_affinity); if (target_idx == -1) return PSCI_E_INVALID_PARAMS; return psci_get_aff_info_state_by_idx(target_idx); } int psci_migrate(u_register_t target_cpu) { int rc; u_register_t resident_cpu_mpidr; rc = psci_spd_migrate_info(&resident_cpu_mpidr); if (rc != PSCI_TOS_UP_MIG_CAP) return (rc == PSCI_TOS_NOT_UP_MIG_CAP) ? PSCI_E_DENIED : PSCI_E_NOT_SUPPORTED; /* * Migrate should only be invoked on the CPU where * the Secure OS is resident. */ if (resident_cpu_mpidr != read_mpidr_el1()) return PSCI_E_NOT_PRESENT; /* Check the validity of the specified target cpu */ rc = psci_validate_mpidr(target_cpu); if (rc != PSCI_E_SUCCESS) return PSCI_E_INVALID_PARAMS; assert(psci_spd_pm && psci_spd_pm->svc_migrate); rc = psci_spd_pm->svc_migrate(read_mpidr_el1(), target_cpu); assert(rc == PSCI_E_SUCCESS || rc == PSCI_E_INTERN_FAIL); return rc; } int psci_migrate_info_type(void) { u_register_t resident_cpu_mpidr; return psci_spd_migrate_info(&resident_cpu_mpidr); } long psci_migrate_info_up_cpu(void) { u_register_t resident_cpu_mpidr; int rc; /* * Return value of this depends upon what * psci_spd_migrate_info() returns. */ rc = psci_spd_migrate_info(&resident_cpu_mpidr); if (rc != PSCI_TOS_NOT_UP_MIG_CAP && rc != PSCI_TOS_UP_MIG_CAP) return PSCI_E_INVALID_PARAMS; return resident_cpu_mpidr; } int psci_features(unsigned int psci_fid) { unsigned int local_caps = psci_caps; /* Check if it is a 64 bit function */ if (((psci_fid >> FUNCID_CC_SHIFT) & FUNCID_CC_MASK) == SMC_64) local_caps &= PSCI_CAP_64BIT_MASK; /* Check for invalid fid */ if (!(is_std_svc_call(psci_fid) && is_valid_fast_smc(psci_fid) && is_psci_fid(psci_fid))) return PSCI_E_NOT_SUPPORTED; /* Check if the psci fid is supported or not */ if (!(local_caps & define_psci_cap(psci_fid))) return PSCI_E_NOT_SUPPORTED; /* Format the feature flags */ if (psci_fid == PSCI_CPU_SUSPEND_AARCH32 || psci_fid == PSCI_CPU_SUSPEND_AARCH64) { /* * The trusted firmware does not support OS Initiated Mode. */ return (FF_PSTATE << FF_PSTATE_SHIFT) | ((!FF_SUPPORTS_OS_INIT_MODE) << FF_MODE_SUPPORT_SHIFT); } /* Return 0 for all other fid's */ return PSCI_E_SUCCESS; } /******************************************************************************* * PSCI top level handler for servicing SMCs. ******************************************************************************/ uintptr_t psci_smc_handler(uint32_t smc_fid, u_register_t x1, u_register_t x2, u_register_t x3, u_register_t x4, void *cookie, void *handle, u_register_t flags) { if (is_caller_secure(flags)) SMC_RET1(handle, SMC_UNK); /* Check the fid against the capabilities */ if (!(psci_caps & define_psci_cap(smc_fid))) SMC_RET1(handle, SMC_UNK); if (((smc_fid >> FUNCID_CC_SHIFT) & FUNCID_CC_MASK) == SMC_32) { /* 32-bit PSCI function, clear top parameter bits */ x1 = (uint32_t)x1; x2 = (uint32_t)x2; x3 = (uint32_t)x3; switch (smc_fid) { case PSCI_VERSION: SMC_RET1(handle, psci_version()); case PSCI_CPU_OFF: SMC_RET1(handle, psci_cpu_off()); case PSCI_CPU_SUSPEND_AARCH32: SMC_RET1(handle, psci_cpu_suspend(x1, x2, x3)); case PSCI_CPU_ON_AARCH32: SMC_RET1(handle, psci_cpu_on(x1, x2, x3)); case PSCI_AFFINITY_INFO_AARCH32: SMC_RET1(handle, psci_affinity_info(x1, x2)); case PSCI_MIG_AARCH32: SMC_RET1(handle, psci_migrate(x1)); case PSCI_MIG_INFO_TYPE: SMC_RET1(handle, psci_migrate_info_type()); case PSCI_MIG_INFO_UP_CPU_AARCH32: SMC_RET1(handle, psci_migrate_info_up_cpu()); case PSCI_SYSTEM_SUSPEND_AARCH32: SMC_RET1(handle, psci_system_suspend(x1, x2)); case PSCI_SYSTEM_OFF: psci_system_off(); /* We should never return from psci_system_off() */ case PSCI_SYSTEM_RESET: psci_system_reset(); /* We should never return from psci_system_reset() */ case PSCI_FEATURES: SMC_RET1(handle, psci_features(x1)); #if ENABLE_PSCI_STAT case PSCI_STAT_RESIDENCY_AARCH32: SMC_RET1(handle, psci_stat_residency(x1, x2)); case PSCI_STAT_COUNT_AARCH32: SMC_RET1(handle, psci_stat_count(x1, x2)); #endif default: break; } } else { /* 64-bit PSCI function */ switch (smc_fid) { case PSCI_CPU_SUSPEND_AARCH64: SMC_RET1(handle, psci_cpu_suspend(x1, x2, x3)); case PSCI_CPU_ON_AARCH64: SMC_RET1(handle, psci_cpu_on(x1, x2, x3)); case PSCI_AFFINITY_INFO_AARCH64: SMC_RET1(handle, psci_affinity_info(x1, x2)); case PSCI_MIG_AARCH64: SMC_RET1(handle, psci_migrate(x1)); case PSCI_MIG_INFO_UP_CPU_AARCH64: SMC_RET1(handle, psci_migrate_info_up_cpu()); case PSCI_SYSTEM_SUSPEND_AARCH64: SMC_RET1(handle, psci_system_suspend(x1, x2)); #if ENABLE_PSCI_STAT case PSCI_STAT_RESIDENCY_AARCH64: SMC_RET1(handle, psci_stat_residency(x1, x2)); case PSCI_STAT_COUNT_AARCH64: SMC_RET1(handle, psci_stat_count(x1, x2)); #endif default: break; } } WARN("Unimplemented PSCI Call: 0x%x \n", smc_fid); SMC_RET1(handle, SMC_UNK); }