Sandrine Bailleux | 798140d | 2014-07-17 16:06:39 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2014, 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 <platform.h> |
| 33 | #include "juno_def.h" |
| 34 | #include "mhu.h" |
| 35 | #include "scpi.h" |
| 36 | |
| 37 | #define MHU_SECURE_SCP_TO_AP_PAYLOAD (MHU_SECURE_BASE+0x0080) |
| 38 | #define MHU_SECURE_AP_TO_SCP_PAYLOAD (MHU_SECURE_BASE+0x0280) |
| 39 | |
| 40 | #define SIZE_SHIFT 20 /* Bit position for size value in MHU header */ |
| 41 | #define SIZE_MASK 0x1ff /* Mask to extract size value in MHU header*/ |
| 42 | |
| 43 | |
| 44 | void *scpi_secure_message_start(void) |
| 45 | { |
| 46 | mhu_secure_message_start(); |
| 47 | |
| 48 | /* Return address of payload area. */ |
| 49 | return (void *)MHU_SECURE_AP_TO_SCP_PAYLOAD; |
| 50 | } |
| 51 | |
| 52 | void scpi_secure_message_send(unsigned command, size_t size) |
| 53 | { |
| 54 | /* Make sure payload can be seen by SCP */ |
| 55 | if (MHU_PAYLOAD_CACHED) |
| 56 | flush_dcache_range(MHU_SECURE_AP_TO_SCP_PAYLOAD, size); |
| 57 | |
| 58 | mhu_secure_message_send(command | (size << SIZE_SHIFT)); |
| 59 | } |
| 60 | |
| 61 | unsigned scpi_secure_message_receive(void **message_out, size_t *size_out) |
| 62 | { |
| 63 | uint32_t response = mhu_secure_message_wait(); |
| 64 | |
| 65 | /* Get size of payload */ |
| 66 | size_t size = (response >> SIZE_SHIFT) & SIZE_MASK; |
| 67 | |
| 68 | /* Clear size from response */ |
| 69 | response &= ~(SIZE_MASK << SIZE_SHIFT); |
| 70 | |
| 71 | /* Make sure we don't read stale data */ |
| 72 | if (MHU_PAYLOAD_CACHED) |
| 73 | inv_dcache_range(MHU_SECURE_SCP_TO_AP_PAYLOAD, size); |
| 74 | |
| 75 | if (size_out) |
| 76 | *size_out = size; |
| 77 | |
| 78 | if (message_out) |
| 79 | *message_out = (void *)MHU_SECURE_SCP_TO_AP_PAYLOAD; |
| 80 | |
| 81 | return response; |
| 82 | } |
| 83 | |
| 84 | void scpi_secure_message_end(void) |
| 85 | { |
| 86 | mhu_secure_message_end(); |
| 87 | } |
| 88 | |
| 89 | static void scpi_secure_send32(unsigned command, uint32_t message) |
| 90 | { |
| 91 | *(__typeof__(message) *)scpi_secure_message_start() = message; |
| 92 | scpi_secure_message_send(command, sizeof(message)); |
| 93 | scpi_secure_message_end(); |
| 94 | } |
| 95 | |
| 96 | int scpi_wait_ready(void) |
| 97 | { |
| 98 | /* Get a message from the SCP */ |
| 99 | scpi_secure_message_start(); |
| 100 | size_t size; |
| 101 | unsigned command = scpi_secure_message_receive(NULL, &size); |
| 102 | scpi_secure_message_end(); |
| 103 | |
| 104 | /* We are expecting 'SCP Ready', produce correct error if it's not */ |
| 105 | scpi_status_t response = SCP_OK; |
| 106 | if (command != SCPI_CMD_SCP_READY) |
| 107 | response = SCP_E_SUPPORT; |
| 108 | else if (size != 0) |
| 109 | response = SCP_E_SIZE; |
| 110 | |
| 111 | /* Send our response back to SCP */ |
| 112 | scpi_secure_send32(command, response); |
| 113 | |
| 114 | return response == SCP_OK ? 0 : -1; |
| 115 | } |
| 116 | |
| 117 | void scpi_set_css_power_state(unsigned mpidr, scpi_power_state_t cpu_state, |
| 118 | scpi_power_state_t cluster_state, scpi_power_state_t css_state) |
| 119 | { |
| 120 | uint32_t state = mpidr & 0x0f; /* CPU ID */ |
| 121 | state |= (mpidr & 0xf00) >> 4; /* Cluster ID */ |
| 122 | state |= cpu_state << 8; |
| 123 | state |= cluster_state << 12; |
| 124 | state |= css_state << 16; |
| 125 | scpi_secure_send32(SCPI_CMD_SET_CSS_POWER_STATE, state); |
| 126 | } |
Juan Castillo | 75ed356 | 2014-08-12 08:42:28 +0100 | [diff] [blame^] | 127 | |
| 128 | uint32_t scpi_sys_power_state(scpi_system_state_t system_state) |
| 129 | { |
| 130 | uint32_t *response; |
| 131 | size_t size; |
| 132 | uint8_t state = system_state & 0xff; |
| 133 | |
| 134 | /* Send the command */ |
| 135 | *(__typeof__(state) *)scpi_secure_message_start() = state; |
| 136 | scpi_secure_message_send(SCPI_CMD_SYS_POWER_STATE, sizeof(state)); |
| 137 | scpi_secure_message_receive((void *)&response, &size); |
| 138 | scpi_secure_message_end(); |
| 139 | return *response; |
| 140 | } |