1b4315306SDan Handley /* 2b4315306SDan Handley * Copyright (c) 2015, ARM Limited and Contributors. All rights reserved. 3b4315306SDan Handley * 4b4315306SDan Handley * Redistribution and use in source and binary forms, with or without 5b4315306SDan Handley * modification, are permitted provided that the following conditions are met: 6b4315306SDan Handley * 7b4315306SDan Handley * Redistributions of source code must retain the above copyright notice, this 8b4315306SDan Handley * list of conditions and the following disclaimer. 9b4315306SDan Handley * 10b4315306SDan Handley * Redistributions in binary form must reproduce the above copyright notice, 11b4315306SDan Handley * this list of conditions and the following disclaimer in the documentation 12b4315306SDan Handley * and/or other materials provided with the distribution. 13b4315306SDan Handley * 14b4315306SDan Handley * Neither the name of ARM nor the names of its contributors may be used 15b4315306SDan Handley * to endorse or promote products derived from this software without specific 16b4315306SDan Handley * prior written permission. 17b4315306SDan Handley * 18b4315306SDan Handley * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 19b4315306SDan Handley * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20b4315306SDan Handley * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21b4315306SDan Handley * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 22b4315306SDan Handley * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23b4315306SDan Handley * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24b4315306SDan Handley * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25b4315306SDan Handley * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26b4315306SDan Handley * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27b4315306SDan Handley * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28b4315306SDan Handley * POSSIBILITY OF SUCH DAMAGE. 29b4315306SDan Handley */ 30b4315306SDan Handley 31b4315306SDan Handley #include <arch_helpers.h> 32b4315306SDan Handley #include <assert.h> 33b4315306SDan Handley #include <errno.h> 34b4315306SDan Handley #include <psci.h> 35b4315306SDan Handley 36b4315306SDan Handley /******************************************************************************* 37b4315306SDan Handley * ARM standard platform handler called to check the validity of the power state 38b4315306SDan Handley * parameter. 39b4315306SDan Handley ******************************************************************************/ 40*38dce70fSSoby Mathew int arm_validate_power_state(unsigned int power_state, 41*38dce70fSSoby Mathew psci_power_state_t *req_state) 42b4315306SDan Handley { 43*38dce70fSSoby Mathew int pstate = psci_get_pstate_type(power_state); 44*38dce70fSSoby Mathew int pwr_lvl = psci_get_pstate_pwrlvl(power_state); 45*38dce70fSSoby Mathew int i; 46*38dce70fSSoby Mathew 47*38dce70fSSoby Mathew assert(req_state); 48*38dce70fSSoby Mathew 49*38dce70fSSoby Mathew if (pwr_lvl > PLAT_MAX_PWR_LVL) 50b4315306SDan Handley return PSCI_E_INVALID_PARAMS; 51*38dce70fSSoby Mathew 52*38dce70fSSoby Mathew /* Sanity check the requested state */ 53*38dce70fSSoby Mathew if (pstate == PSTATE_TYPE_STANDBY) { 54*38dce70fSSoby Mathew /* 55*38dce70fSSoby Mathew * It's possible to enter standby only on power level 0 56*38dce70fSSoby Mathew * Ignore any other power level. 57*38dce70fSSoby Mathew */ 58*38dce70fSSoby Mathew if (pwr_lvl != ARM_PWR_LVL0) 59*38dce70fSSoby Mathew return PSCI_E_INVALID_PARAMS; 60*38dce70fSSoby Mathew 61*38dce70fSSoby Mathew req_state->pwr_domain_state[ARM_PWR_LVL0] = 62*38dce70fSSoby Mathew ARM_LOCAL_STATE_RET; 63*38dce70fSSoby Mathew } else { 64*38dce70fSSoby Mathew for (i = ARM_PWR_LVL0; i <= pwr_lvl; i++) 65*38dce70fSSoby Mathew req_state->pwr_domain_state[i] = 66*38dce70fSSoby Mathew ARM_LOCAL_STATE_OFF; 67b4315306SDan Handley } 68b4315306SDan Handley 69b4315306SDan Handley /* 70b4315306SDan Handley * We expect the 'state id' to be zero. 71b4315306SDan Handley */ 72b4315306SDan Handley if (psci_get_pstate_id(power_state)) 73b4315306SDan Handley return PSCI_E_INVALID_PARAMS; 74b4315306SDan Handley 75b4315306SDan Handley return PSCI_E_SUCCESS; 76b4315306SDan Handley } 77