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
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
|
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2020 Linaro Limited.
*/
#define LOG_CATEGORY UCLASS_SCMI_AGENT
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <scmi_agent.h>
#include <scmi_agent-uclass.h>
#include <dm/devres.h>
#include <dm/device_compat.h>
#include <dm/device-internal.h>
#include <linux/arm-smccc.h>
#include <linux/compat.h>
#include "smt.h"
#define SMCCC_RET_NOT_SUPPORTED ((unsigned long)-1)
/**
* struct scmi_smccc_channel - Description of an SCMI SMCCC transport
* @func_id: SMCCC function ID used by the SCMI transport
* @smt: Shared memory buffer
*/
struct scmi_smccc_channel {
ulong func_id;
struct scmi_smt smt;
};
/**
* struct scmi_channel - Channel instance referenced in SCMI drivers
* @ref: Reference to local channel instance
**/
struct scmi_channel {
struct scmi_smccc_channel ref;
};
static int scmi_smccc_process_msg(struct udevice *dev,
struct scmi_channel *channel,
struct scmi_msg *msg)
{
struct scmi_smccc_channel *chan = &channel->ref;
struct arm_smccc_res res;
int ret;
ret = scmi_write_msg_to_smt(dev, &chan->smt, msg);
if (ret)
return ret;
arm_smccc_smc(chan->func_id, 0, 0, 0, 0, 0, 0, 0, &res);
if (res.a0 == SMCCC_RET_NOT_SUPPORTED)
ret = -ENXIO;
else
ret = scmi_read_resp_from_smt(dev, &chan->smt, msg);
scmi_clear_smt_channel(&chan->smt);
return ret;
}
static int setup_channel(struct udevice *dev, struct scmi_smccc_channel *chan)
{
u32 func_id;
int ret;
if (dev_read_u32(dev, "arm,smc-id", &func_id)) {
dev_err(dev, "Missing property func-id\n");
return -EINVAL;
}
chan->func_id = func_id;
ret = scmi_dt_get_smt_buffer(dev, &chan->smt);
if (ret)
dev_err(dev, "Failed to get smt resources: %d\n", ret);
return ret;
}
static int scmi_smccc_get_channel(struct udevice *dev,
struct scmi_channel **channel)
{
struct scmi_smccc_channel *base_chan = dev_get_plat(dev);
struct scmi_smccc_channel *chan;
u32 func_id;
int ret;
if (dev_read_u32(dev, "arm,smc-id", &func_id)) {
/* Uses agent base channel */
*channel = container_of(base_chan, struct scmi_channel, ref);
return 0;
}
/* Setup a dedicated channel */
chan = calloc(1, sizeof(*chan));
if (!chan)
return -ENOMEM;
ret = setup_channel(dev, chan);
if (ret) {
free(chan);
return ret;
}
*channel = container_of(chan, struct scmi_channel, ref);
return 0;
}
static int scmi_smccc_of_to_plat(struct udevice *dev)
{
struct scmi_smccc_channel *chan = dev_get_plat(dev);
return setup_channel(dev, chan);
}
static const struct udevice_id scmi_smccc_ids[] = {
{ .compatible = "arm,scmi-smc" },
{ }
};
static const struct scmi_agent_ops scmi_smccc_ops = {
.of_get_channel = scmi_smccc_get_channel,
.process_msg = scmi_smccc_process_msg,
};
U_BOOT_DRIVER(scmi_smccc) = {
.name = "scmi-over-smccc",
.id = UCLASS_SCMI_AGENT,
.of_match = scmi_smccc_ids,
.plat_auto = sizeof(struct scmi_smccc_channel),
.of_to_plat = scmi_smccc_of_to_plat,
.ops = &scmi_smccc_ops,
};
|
