64 lines
2.6 KiB
C
64 lines
2.6 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.h>
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#include <assert.h>
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#include <platform.h>
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#include <psci.h>
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/*
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* The PSCI generic code uses this API to let the platform participate in state
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* coordination during a power management operation. It compares the platform
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* specific local power states requested by each cpu for a given power domain
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* and returns the coordinated target power state that the domain should
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* enter. A platform assigns a number to a local power state. This default
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* implementation assumes that the platform assigns these numbers in order of
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* increasing depth of the power state i.e. for two power states X & Y, if X < Y
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* then X represents a shallower power state than Y. As a result, the
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* coordinated target local power state for a power domain will be the minimum
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* of the requested local power states.
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*/
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plat_local_state_t plat_get_target_pwr_state(unsigned int lvl,
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const plat_local_state_t *states,
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unsigned int ncpu)
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{
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plat_local_state_t target = PLAT_MAX_OFF_STATE, temp;
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assert(ncpu);
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do {
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temp = *states++;
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if (temp < target)
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target = temp;
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} while (--ncpu);
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return target;
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}
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