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