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
scpi_secure_message_start(void)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
scpi_secure_message_send(unsigned command,size_t size)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
scpi_secure_message_receive(void ** message_out,size_t * size_out)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
scpi_secure_message_end(void)84 void scpi_secure_message_end(void)
85 {
86 mhu_secure_message_end();
87 }
88
scpi_secure_send32(unsigned command,uint32_t message)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
scpi_wait_ready(void)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
scpi_set_css_power_state(unsigned mpidr,scpi_power_state_t cpu_state,scpi_power_state_t cluster_state,scpi_power_state_t css_state)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 }
127
scpi_sys_power_state(scpi_system_state_t system_state)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 }
141