1*b4315306SDan Handley /* 2*b4315306SDan Handley * Copyright (c) 2015, ARM Limited and Contributors. All rights reserved. 3*b4315306SDan Handley * 4*b4315306SDan Handley * Redistribution and use in source and binary forms, with or without 5*b4315306SDan Handley * modification, are permitted provided that the following conditions are met: 6*b4315306SDan Handley * 7*b4315306SDan Handley * Redistributions of source code must retain the above copyright notice, this 8*b4315306SDan Handley * list of conditions and the following disclaimer. 9*b4315306SDan Handley * 10*b4315306SDan Handley * Redistributions in binary form must reproduce the above copyright notice, 11*b4315306SDan Handley * this list of conditions and the following disclaimer in the documentation 12*b4315306SDan Handley * and/or other materials provided with the distribution. 13*b4315306SDan Handley * 14*b4315306SDan Handley * Neither the name of ARM nor the names of its contributors may be used 15*b4315306SDan Handley * to endorse or promote products derived from this software without specific 16*b4315306SDan Handley * prior written permission. 17*b4315306SDan Handley * 18*b4315306SDan Handley * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 19*b4315306SDan Handley * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20*b4315306SDan Handley * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21*b4315306SDan Handley * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 22*b4315306SDan Handley * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23*b4315306SDan Handley * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24*b4315306SDan Handley * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25*b4315306SDan Handley * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26*b4315306SDan Handley * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27*b4315306SDan Handley * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28*b4315306SDan Handley * POSSIBILITY OF SUCH DAMAGE. 29*b4315306SDan Handley */ 30*b4315306SDan Handley 31*b4315306SDan Handley #include <arch_helpers.h> 32*b4315306SDan Handley #include <assert.h> 33*b4315306SDan Handley #include <errno.h> 34*b4315306SDan Handley #include <psci.h> 35*b4315306SDan Handley 36*b4315306SDan Handley 37*b4315306SDan Handley /******************************************************************************* 38*b4315306SDan Handley * ARM standard platform utility function which is used to determine if any 39*b4315306SDan Handley * platform actions should be performed for the specified affinity instance 40*b4315306SDan Handley * given its state. Nothing needs to be done if the 'state' is not off or if 41*b4315306SDan Handley * this is not the highest affinity level which will enter the 'state'. 42*b4315306SDan Handley ******************************************************************************/ 43*b4315306SDan Handley int32_t arm_do_affinst_actions(unsigned int afflvl, unsigned int state) 44*b4315306SDan Handley { 45*b4315306SDan Handley unsigned int max_phys_off_afflvl; 46*b4315306SDan Handley 47*b4315306SDan Handley assert(afflvl <= MPIDR_AFFLVL1); 48*b4315306SDan Handley 49*b4315306SDan Handley if (state != PSCI_STATE_OFF) 50*b4315306SDan Handley return -EAGAIN; 51*b4315306SDan Handley 52*b4315306SDan Handley /* 53*b4315306SDan Handley * Find the highest affinity level which will be suspended and postpone 54*b4315306SDan Handley * all the platform specific actions until that level is hit. 55*b4315306SDan Handley */ 56*b4315306SDan Handley max_phys_off_afflvl = psci_get_max_phys_off_afflvl(); 57*b4315306SDan Handley assert(max_phys_off_afflvl != PSCI_INVALID_DATA); 58*b4315306SDan Handley if (afflvl != max_phys_off_afflvl) 59*b4315306SDan Handley return -EAGAIN; 60*b4315306SDan Handley 61*b4315306SDan Handley return 0; 62*b4315306SDan Handley } 63*b4315306SDan Handley 64*b4315306SDan Handley /******************************************************************************* 65*b4315306SDan Handley * ARM standard platform handler called to check the validity of the power state 66*b4315306SDan Handley * parameter. 67*b4315306SDan Handley ******************************************************************************/ 68*b4315306SDan Handley int arm_validate_power_state(unsigned int power_state) 69*b4315306SDan Handley { 70*b4315306SDan Handley /* Sanity check the requested state */ 71*b4315306SDan Handley if (psci_get_pstate_type(power_state) == PSTATE_TYPE_STANDBY) { 72*b4315306SDan Handley /* 73*b4315306SDan Handley * It's possible to enter standby only on affinity level 0 74*b4315306SDan Handley * (i.e. a CPU on ARM standard platforms). 75*b4315306SDan Handley * Ignore any other affinity level. 76*b4315306SDan Handley */ 77*b4315306SDan Handley if (psci_get_pstate_afflvl(power_state) != MPIDR_AFFLVL0) 78*b4315306SDan Handley return PSCI_E_INVALID_PARAMS; 79*b4315306SDan Handley } 80*b4315306SDan Handley 81*b4315306SDan Handley /* 82*b4315306SDan Handley * We expect the 'state id' to be zero. 83*b4315306SDan Handley */ 84*b4315306SDan Handley if (psci_get_pstate_id(power_state)) 85*b4315306SDan Handley return PSCI_E_INVALID_PARAMS; 86*b4315306SDan Handley 87*b4315306SDan Handley return PSCI_E_SUCCESS; 88*b4315306SDan Handley } 89