1 /*
2 * Copyright (c) 2017-2019, ARM Limited and Contributors. All rights reserved.
3 *
4 * SPDX-License-Identifier: BSD-3-Clause
5 */
6
7 #include <assert.h>
8
9 #include <arch_helpers.h>
10 #include <common/debug.h>
11 #include <drivers/arm/css/scmi.h>
12
13 #include "scmi_private.h"
14
15 /*
16 * API to set the SCMI power domain power state.
17 */
scmi_pwr_state_set(void * p,uint32_t domain_id,uint32_t scmi_pwr_state)18 int scmi_pwr_state_set(void *p, uint32_t domain_id,
19 uint32_t scmi_pwr_state)
20 {
21 mailbox_mem_t *mbx_mem;
22 unsigned int token = 0;
23 int ret;
24
25 /*
26 * Only asynchronous mode of `set power state` command is allowed on
27 * application processors.
28 */
29 uint32_t pwr_state_set_msg_flag = SCMI_PWR_STATE_SET_FLAG_ASYNC;
30 scmi_channel_t *ch = (scmi_channel_t *)p;
31
32 validate_scmi_channel(ch);
33
34 scmi_get_channel(ch);
35
36 mbx_mem = (mailbox_mem_t *)(ch->info->scmi_mbx_mem);
37 mbx_mem->msg_header = SCMI_MSG_CREATE(SCMI_PWR_DMN_PROTO_ID,
38 SCMI_PWR_STATE_SET_MSG, token);
39 mbx_mem->len = SCMI_PWR_STATE_SET_MSG_LEN;
40 mbx_mem->flags = SCMI_FLAG_RESP_POLL;
41 SCMI_PAYLOAD_ARG3(mbx_mem->payload, pwr_state_set_msg_flag,
42 domain_id, scmi_pwr_state);
43
44 scmi_send_sync_command(ch);
45
46 /* Get the return values */
47 SCMI_PAYLOAD_RET_VAL1(mbx_mem->payload, ret);
48 assert(mbx_mem->len == SCMI_PWR_STATE_SET_RESP_LEN);
49 assert(token == SCMI_MSG_GET_TOKEN(mbx_mem->msg_header));
50
51 scmi_put_channel(ch);
52
53 return ret;
54 }
55
56 /*
57 * API to get the SCMI power domain power state.
58 */
scmi_pwr_state_get(void * p,uint32_t domain_id,uint32_t * scmi_pwr_state)59 int scmi_pwr_state_get(void *p, uint32_t domain_id,
60 uint32_t *scmi_pwr_state)
61 {
62 mailbox_mem_t *mbx_mem;
63 unsigned int token = 0;
64 int ret;
65 scmi_channel_t *ch = (scmi_channel_t *)p;
66
67 validate_scmi_channel(ch);
68
69 scmi_get_channel(ch);
70
71 mbx_mem = (mailbox_mem_t *)(ch->info->scmi_mbx_mem);
72 mbx_mem->msg_header = SCMI_MSG_CREATE(SCMI_PWR_DMN_PROTO_ID,
73 SCMI_PWR_STATE_GET_MSG, token);
74 mbx_mem->len = SCMI_PWR_STATE_GET_MSG_LEN;
75 mbx_mem->flags = SCMI_FLAG_RESP_POLL;
76 SCMI_PAYLOAD_ARG1(mbx_mem->payload, domain_id);
77
78 scmi_send_sync_command(ch);
79
80 /* Get the return values */
81 SCMI_PAYLOAD_RET_VAL2(mbx_mem->payload, ret, *scmi_pwr_state);
82 assert(mbx_mem->len == SCMI_PWR_STATE_GET_RESP_LEN);
83 assert(token == SCMI_MSG_GET_TOKEN(mbx_mem->msg_header));
84
85 scmi_put_channel(ch);
86
87 return ret;
88 }
89