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 * ARM standard platform handler called to check the validity of the power state 38 * parameter. 39 ******************************************************************************/ 40 int arm_validate_power_state(unsigned int power_state, 41 psci_power_state_t *req_state) 42 { 43 int pstate = psci_get_pstate_type(power_state); 44 int pwr_lvl = psci_get_pstate_pwrlvl(power_state); 45 int i; 46 47 assert(req_state); 48 49 if (pwr_lvl > PLAT_MAX_PWR_LVL) 50 return PSCI_E_INVALID_PARAMS; 51 52 /* Sanity check the requested state */ 53 if (pstate == PSTATE_TYPE_STANDBY) { 54 /* 55 * It's possible to enter standby only on power level 0 56 * Ignore any other power level. 57 */ 58 if (pwr_lvl != ARM_PWR_LVL0) 59 return PSCI_E_INVALID_PARAMS; 60 61 req_state->pwr_domain_state[ARM_PWR_LVL0] = 62 ARM_LOCAL_STATE_RET; 63 } else { 64 for (i = ARM_PWR_LVL0; i <= pwr_lvl; i++) 65 req_state->pwr_domain_state[i] = 66 ARM_LOCAL_STATE_OFF; 67 } 68 69 /* 70 * We expect the 'state id' to be zero. 71 */ 72 if (psci_get_pstate_id(power_state)) 73 return PSCI_E_INVALID_PARAMS; 74 75 return PSCI_E_SUCCESS; 76 } 77