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
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
|
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright 2019 NXP.
*/
#include <dt-bindings/firmware/imx/rsrc.h>
#include <linux/firmware/imx/sci.h>
#include <linux/slab.h>
#include <linux/sys_soc.h>
#include <linux/platform_device.h>
#include <linux/of.h>
#define IMX_SCU_SOC_DRIVER_NAME "imx-scu-soc"
static struct imx_sc_ipc *soc_ipc_handle;
struct imx_sc_msg_misc_get_soc_id {
struct imx_sc_rpc_msg hdr;
union {
struct {
u32 control;
u16 resource;
} __packed req;
struct {
u32 id;
} resp;
} data;
} __packed;
struct imx_sc_msg_misc_get_soc_uid {
struct imx_sc_rpc_msg hdr;
u32 uid_low;
u32 uid_high;
} __packed;
static ssize_t soc_uid_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct imx_sc_msg_misc_get_soc_uid msg;
struct imx_sc_rpc_msg *hdr = &msg.hdr;
u64 soc_uid;
int ret;
hdr->ver = IMX_SC_RPC_VERSION;
hdr->svc = IMX_SC_RPC_SVC_MISC;
hdr->func = IMX_SC_MISC_FUNC_UNIQUE_ID;
hdr->size = 1;
ret = imx_scu_call_rpc(soc_ipc_handle, &msg, false);
if (ret) {
pr_err("%s: get soc uid failed, ret %d\n", __func__, ret);
return ret;
}
soc_uid = msg.uid_high;
soc_uid <<= 32;
soc_uid |= msg.uid_low;
return sprintf(buf, "%016llX\n", soc_uid);
}
static DEVICE_ATTR_RO(soc_uid);
static int imx_scu_soc_id(void)
{
struct imx_sc_msg_misc_get_soc_id msg;
struct imx_sc_rpc_msg *hdr = &msg.hdr;
int ret;
hdr->ver = IMX_SC_RPC_VERSION;
hdr->svc = IMX_SC_RPC_SVC_MISC;
hdr->func = IMX_SC_MISC_FUNC_GET_CONTROL;
hdr->size = 3;
msg.data.req.control = IMX_SC_C_ID;
msg.data.req.resource = IMX_SC_R_SYSTEM;
ret = imx_scu_call_rpc(soc_ipc_handle, &msg, true);
if (ret) {
pr_err("%s: get soc info failed, ret %d\n", __func__, ret);
return ret;
}
return msg.data.resp.id;
}
static int imx_scu_soc_probe(struct platform_device *pdev)
{
struct soc_device_attribute *soc_dev_attr;
struct soc_device *soc_dev;
int id, ret;
u32 val;
ret = imx_scu_get_handle(&soc_ipc_handle);
if (ret)
return ret;
soc_dev_attr = devm_kzalloc(&pdev->dev, sizeof(*soc_dev_attr),
GFP_KERNEL);
if (!soc_dev_attr)
return -ENOMEM;
soc_dev_attr->family = "Freescale i.MX";
ret = of_property_read_string(of_root,
"model",
&soc_dev_attr->machine);
if (ret)
return ret;
id = imx_scu_soc_id();
if (id < 0)
return -EINVAL;
/* format soc_id value passed from SCU firmware */
val = id & 0x1f;
soc_dev_attr->soc_id = kasprintf(GFP_KERNEL, "0x%x", val);
if (!soc_dev_attr->soc_id)
return -ENOMEM;
/* format revision value passed from SCU firmware */
val = (id >> 5) & 0xf;
val = (((val >> 2) + 1) << 4) | (val & 0x3);
soc_dev_attr->revision = kasprintf(GFP_KERNEL,
"%d.%d",
(val >> 4) & 0xf,
val & 0xf);
if (!soc_dev_attr->revision) {
ret = -ENOMEM;
goto free_soc_id;
}
soc_dev = soc_device_register(soc_dev_attr);
if (IS_ERR(soc_dev)) {
ret = PTR_ERR(soc_dev);
goto free_revision;
}
ret = device_create_file(soc_device_to_device(soc_dev),
&dev_attr_soc_uid);
if (ret)
goto free_revision;
return 0;
free_revision:
kfree(soc_dev_attr->revision);
free_soc_id:
kfree(soc_dev_attr->soc_id);
return ret;
}
static struct platform_driver imx_scu_soc_driver = {
.driver = {
.name = IMX_SCU_SOC_DRIVER_NAME,
},
.probe = imx_scu_soc_probe,
};
static int __init imx_scu_soc_init(void)
{
struct platform_device *pdev;
struct device_node *np;
int ret;
np = of_find_compatible_node(NULL, NULL, "fsl,imx-scu");
if (!np)
return -ENODEV;
of_node_put(np);
ret = platform_driver_register(&imx_scu_soc_driver);
if (ret)
return ret;
pdev = platform_device_register_simple(IMX_SCU_SOC_DRIVER_NAME,
-1, NULL, 0);
if (IS_ERR(pdev))
platform_driver_unregister(&imx_scu_soc_driver);
return PTR_ERR_OR_ZERO(pdev);
}
device_initcall(imx_scu_soc_init);
|
