Dan Handley | 9df4804 | 2015-03-19 18:58:55 +0000 | [diff] [blame] | 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 | |
Dan Handley | 9df4804 | 2015-03-19 18:58:55 +0000 | [diff] [blame] | 36 | /******************************************************************************* |
Soby Mathew | fec4eb7 | 2015-07-01 16:16:20 +0100 | [diff] [blame^] | 37 | * ARM standard platform handler called to check the validity of the power state |
| 38 | * parameter. |
Dan Handley | 9df4804 | 2015-03-19 18:58:55 +0000 | [diff] [blame] | 39 | ******************************************************************************/ |
Soby Mathew | fec4eb7 | 2015-07-01 16:16:20 +0100 | [diff] [blame^] | 40 | int arm_validate_power_state(unsigned int power_state, |
| 41 | psci_power_state_t *req_state) |
Dan Handley | 9df4804 | 2015-03-19 18:58:55 +0000 | [diff] [blame] | 42 | { |
Soby Mathew | fec4eb7 | 2015-07-01 16:16:20 +0100 | [diff] [blame^] | 43 | int pstate = psci_get_pstate_type(power_state); |
| 44 | int pwr_lvl = psci_get_pstate_pwrlvl(power_state); |
| 45 | int i; |
Dan Handley | 9df4804 | 2015-03-19 18:58:55 +0000 | [diff] [blame] | 46 | |
Soby Mathew | fec4eb7 | 2015-07-01 16:16:20 +0100 | [diff] [blame^] | 47 | assert(req_state); |
Dan Handley | 9df4804 | 2015-03-19 18:58:55 +0000 | [diff] [blame] | 48 | |
Soby Mathew | fec4eb7 | 2015-07-01 16:16:20 +0100 | [diff] [blame^] | 49 | if (pwr_lvl > PLAT_MAX_PWR_LVL) |
| 50 | return PSCI_E_INVALID_PARAMS; |
Dan Handley | 9df4804 | 2015-03-19 18:58:55 +0000 | [diff] [blame] | 51 | |
Dan Handley | 9df4804 | 2015-03-19 18:58:55 +0000 | [diff] [blame] | 52 | /* Sanity check the requested state */ |
Soby Mathew | fec4eb7 | 2015-07-01 16:16:20 +0100 | [diff] [blame^] | 53 | if (pstate == PSTATE_TYPE_STANDBY) { |
Dan Handley | 9df4804 | 2015-03-19 18:58:55 +0000 | [diff] [blame] | 54 | /* |
Soby Mathew | fec4eb7 | 2015-07-01 16:16:20 +0100 | [diff] [blame^] | 55 | * It's possible to enter standby only on power level 0 |
| 56 | * Ignore any other power level. |
Dan Handley | 9df4804 | 2015-03-19 18:58:55 +0000 | [diff] [blame] | 57 | */ |
Soby Mathew | fec4eb7 | 2015-07-01 16:16:20 +0100 | [diff] [blame^] | 58 | if (pwr_lvl != ARM_PWR_LVL0) |
Dan Handley | 9df4804 | 2015-03-19 18:58:55 +0000 | [diff] [blame] | 59 | return PSCI_E_INVALID_PARAMS; |
Soby Mathew | fec4eb7 | 2015-07-01 16:16:20 +0100 | [diff] [blame^] | 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; |
Dan Handley | 9df4804 | 2015-03-19 18:58:55 +0000 | [diff] [blame] | 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 | } |