| 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 | |
| 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 | } |