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
|
// SPDX-License-Identifier: GPL-2.0+
/*
* i.MX8 OCOTP fusebox driver
*
* Copyright 2019 NXP
*
* Peng Fan <peng.fan@nxp.com>
*/
#include <linux/firmware/imx/sci.h>
#include <linux/module.h>
#include <linux/nvmem-provider.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
enum ocotp_devtype {
IMX8QXP,
IMX8QM,
};
struct ocotp_devtype_data {
int devtype;
int nregs;
};
struct ocotp_priv {
struct device *dev;
const struct ocotp_devtype_data *data;
struct imx_sc_ipc *nvmem_ipc;
};
struct imx_sc_msg_misc_fuse_read {
struct imx_sc_rpc_msg hdr;
u32 word;
} __packed;
static struct ocotp_devtype_data imx8qxp_data = {
.devtype = IMX8QXP,
.nregs = 800,
};
static struct ocotp_devtype_data imx8qm_data = {
.devtype = IMX8QM,
.nregs = 800,
};
static int imx_sc_misc_otp_fuse_read(struct imx_sc_ipc *ipc, u32 word,
u32 *val)
{
struct imx_sc_msg_misc_fuse_read 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_OTP_FUSE_READ;
hdr->size = 2;
msg.word = word;
ret = imx_scu_call_rpc(ipc, &msg, true);
if (ret)
return ret;
*val = msg.word;
return 0;
}
static int imx_scu_ocotp_read(void *context, unsigned int offset,
void *val, size_t bytes)
{
struct ocotp_priv *priv = context;
u32 count, index, num_bytes;
u32 *buf;
void *p;
int i, ret;
index = offset >> 2;
num_bytes = round_up((offset % 4) + bytes, 4);
count = num_bytes >> 2;
if (count > (priv->data->nregs - index))
count = priv->data->nregs - index;
p = kzalloc(num_bytes, GFP_KERNEL);
if (!p)
return -ENOMEM;
buf = p;
for (i = index; i < (index + count); i++) {
if (priv->data->devtype == IMX8QXP) {
if ((i > 271) && (i < 544)) {
*buf++ = 0;
continue;
}
}
ret = imx_sc_misc_otp_fuse_read(priv->nvmem_ipc, i, buf);
if (ret) {
kfree(p);
return ret;
}
buf++;
}
memcpy(val, (u8 *)p + offset % 4, bytes);
kfree(p);
return 0;
}
static struct nvmem_config imx_scu_ocotp_nvmem_config = {
.name = "imx-scu-ocotp",
.read_only = true,
.word_size = 4,
.stride = 1,
.owner = THIS_MODULE,
.reg_read = imx_scu_ocotp_read,
};
static const struct of_device_id imx_scu_ocotp_dt_ids[] = {
{ .compatible = "fsl,imx8qxp-scu-ocotp", (void *)&imx8qxp_data },
{ .compatible = "fsl,imx8qm-scu-ocotp", (void *)&imx8qm_data },
{ },
};
MODULE_DEVICE_TABLE(of, imx_scu_ocotp_dt_ids);
static int imx_scu_ocotp_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct ocotp_priv *priv;
struct nvmem_device *nvmem;
int ret;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
ret = imx_scu_get_handle(&priv->nvmem_ipc);
if (ret)
return ret;
priv->data = of_device_get_match_data(dev);
priv->dev = dev;
imx_scu_ocotp_nvmem_config.size = 4 * priv->data->nregs;
imx_scu_ocotp_nvmem_config.dev = dev;
imx_scu_ocotp_nvmem_config.priv = priv;
nvmem = devm_nvmem_register(dev, &imx_scu_ocotp_nvmem_config);
return PTR_ERR_OR_ZERO(nvmem);
}
static struct platform_driver imx_scu_ocotp_driver = {
.probe = imx_scu_ocotp_probe,
.driver = {
.name = "imx_scu_ocotp",
.of_match_table = imx_scu_ocotp_dt_ids,
},
};
module_platform_driver(imx_scu_ocotp_driver);
MODULE_AUTHOR("Peng Fan <peng.fan@nxp.com>");
MODULE_DESCRIPTION("i.MX8 SCU OCOTP fuse box driver");
MODULE_LICENSE("GPL v2");
|
