89 lines
3.4 KiB
C
89 lines
3.4 KiB
C
/*
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* Copyright (c) 2015, ARM Limited and Contributors. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of ARM nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <arch_helpers.h>
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#include <assert.h>
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#include <errno.h>
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#include <psci.h>
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/*******************************************************************************
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* ARM standard platform utility function which is used to determine if any
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* platform actions should be performed for the specified affinity instance
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* given its state. Nothing needs to be done if the 'state' is not off or if
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* this is not the highest affinity level which will enter the 'state'.
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******************************************************************************/
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int32_t arm_do_affinst_actions(unsigned int afflvl, unsigned int state)
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{
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unsigned int max_phys_off_afflvl;
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assert(afflvl <= MPIDR_AFFLVL1);
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if (state != PSCI_STATE_OFF)
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return -EAGAIN;
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/*
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* Find the highest affinity level which will be suspended and postpone
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* all the platform specific actions until that level is hit.
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*/
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max_phys_off_afflvl = psci_get_max_phys_off_afflvl();
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assert(max_phys_off_afflvl != PSCI_INVALID_DATA);
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if (afflvl != max_phys_off_afflvl)
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return -EAGAIN;
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return 0;
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}
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/*******************************************************************************
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* ARM standard platform handler called to check the validity of the power state
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* parameter.
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******************************************************************************/
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int arm_validate_power_state(unsigned int power_state)
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{
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/* Sanity check the requested state */
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if (psci_get_pstate_type(power_state) == PSTATE_TYPE_STANDBY) {
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/*
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* It's possible to enter standby only on affinity level 0
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* (i.e. a CPU on ARM standard platforms).
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* Ignore any other affinity level.
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*/
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if (psci_get_pstate_afflvl(power_state) != MPIDR_AFFLVL0)
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return PSCI_E_INVALID_PARAMS;
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}
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/*
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* We expect the 'state id' to be zero.
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*/
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if (psci_get_pstate_id(power_state))
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return PSCI_E_INVALID_PARAMS;
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return PSCI_E_SUCCESS;
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}
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