1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
|
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Intel Core SoC Power Management Controller Header File
*
* Copyright (c) 2025, Intel Corporation.
* All Rights Reserved.
*
*/
#ifndef INTEL_PMC_IPC_H
#define INTEL_PMC_IPC_H
#include <linux/acpi.h>
#define IPC_SOC_REGISTER_ACCESS 0xAA
#define IPC_SOC_SUB_CMD_READ 0x00
#define IPC_SOC_SUB_CMD_WRITE 0x01
#define PMC_IPCS_PARAM_COUNT 7
#define VALID_IPC_RESPONSE 5
struct pmc_ipc_cmd {
u32 cmd;
u32 sub_cmd;
u32 size;
u32 wbuf[4];
};
struct pmc_ipc_rbuf {
u32 buf[4];
};
/**
* intel_pmc_ipc() - PMC IPC Mailbox accessor
* @ipc_cmd: Prepared input command to send
* @rbuf: Allocated array for returned IPC data
*
* Return: 0 on success. Non-zero on mailbox error
*/
static inline int intel_pmc_ipc(struct pmc_ipc_cmd *ipc_cmd, struct pmc_ipc_rbuf *rbuf)
{
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
union acpi_object params[PMC_IPCS_PARAM_COUNT] = {
{.type = ACPI_TYPE_INTEGER,},
{.type = ACPI_TYPE_INTEGER,},
{.type = ACPI_TYPE_INTEGER,},
{.type = ACPI_TYPE_INTEGER,},
{.type = ACPI_TYPE_INTEGER,},
{.type = ACPI_TYPE_INTEGER,},
{.type = ACPI_TYPE_INTEGER,},
};
struct acpi_object_list arg_list = { PMC_IPCS_PARAM_COUNT, params };
union acpi_object *obj;
int status;
if (!ipc_cmd || !rbuf)
return -EINVAL;
/*
* 0: IPC Command
* 1: IPC Sub Command
* 2: Size
* 3-6: Write Buffer for offset
*/
params[0].integer.value = ipc_cmd->cmd;
params[1].integer.value = ipc_cmd->sub_cmd;
params[2].integer.value = ipc_cmd->size;
params[3].integer.value = ipc_cmd->wbuf[0];
params[4].integer.value = ipc_cmd->wbuf[1];
params[5].integer.value = ipc_cmd->wbuf[2];
params[6].integer.value = ipc_cmd->wbuf[3];
status = acpi_evaluate_object(NULL, "\\IPCS", &arg_list, &buffer);
if (ACPI_FAILURE(status))
return -ENODEV;
obj = buffer.pointer;
if (obj && obj->type == ACPI_TYPE_PACKAGE &&
obj->package.count == VALID_IPC_RESPONSE) {
const union acpi_object *objs = obj->package.elements;
if ((u8)objs[0].integer.value != 0)
return -EINVAL;
rbuf->buf[0] = objs[1].integer.value;
rbuf->buf[1] = objs[2].integer.value;
rbuf->buf[2] = objs[3].integer.value;
rbuf->buf[3] = objs[4].integer.value;
} else {
return -EINVAL;
}
return 0;
}
#endif /* INTEL_PMC_IPC_H */
|
