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
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
|
/* Copyright (c) 2013-2015, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/export.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/of_device.h>
#include <soc/qcom/jtag.h>
#define fuse_writel(drvdata, val, off) __raw_writel((val), drvdata->base + off)
#define fuse_readl(drvdata, off) __raw_readl(drvdata->base + off)
#define OEM_CONFIG0 (0x000)
#define OEM_CONFIG1 (0x004)
#define OEM_CONFIG2 (0x008)
/* JTAG FUSE V1 */
#define ALL_DEBUG_DISABLE BIT(21)
#define APPS_DBGEN_DISABLE BIT(0)
#define APPS_NIDEN_DISABLE BIT(1)
#define APPS_SPIDEN_DISABLE BIT(2)
#define APPS_SPNIDEN_DISABLE BIT(3)
#define DAP_DEVICEEN_DISABLE BIT(8)
/* JTAG FUSE V2 */
#define ALL_DEBUG_DISABLE_V2 BIT(0)
#define APPS_DBGEN_DISABLE_V2 BIT(10)
#define APPS_NIDEN_DISABLE_V2 BIT(11)
#define APPS_SPIDEN_DISABLE_V2 BIT(12)
#define APPS_SPNIDEN_DISABLE_V2 BIT(13)
#define DAP_DEVICEEN_DISABLE_V2 BIT(18)
/* JTAG FUSE V3 */
#define ALL_DEBUG_DISABLE_V3 BIT(29)
#define APPS_DBGEN_DISABLE_V3 BIT(8)
#define APPS_NIDEN_DISABLE_V3 BIT(21)
#define APPS_SPIDEN_DISABLE_V3 BIT(5)
#define APPS_SPNIDEN_DISABLE_V3 BIT(31)
#define DAP_DEVICEEN_DISABLE_V3 BIT(7)
#define JTAG_FUSE_VERSION_V1 "qcom,jtag-fuse"
#define JTAG_FUSE_VERSION_V2 "qcom,jtag-fuse-v2"
#define JTAG_FUSE_VERSION_V3 "qcom,jtag-fuse-v3"
struct fuse_drvdata {
void __iomem *base;
struct device *dev;
bool fuse_v2;
bool fuse_v3;
};
static struct fuse_drvdata *fusedrvdata;
bool msm_jtag_fuse_apps_access_disabled(void)
{
struct fuse_drvdata *drvdata = fusedrvdata;
uint32_t config0, config1, config2;
bool ret = false;
if (!drvdata)
return false;
config0 = fuse_readl(drvdata, OEM_CONFIG0);
config1 = fuse_readl(drvdata, OEM_CONFIG1);
dev_dbg(drvdata->dev, "apps config0: %lx\n", (unsigned long)config0);
dev_dbg(drvdata->dev, "apps config1: %lx\n", (unsigned long)config1);
if (drvdata->fuse_v3) {
config2 = fuse_readl(drvdata, OEM_CONFIG2);
dev_dbg(drvdata->dev, "apps config2: %lx\n",
(unsigned long)config2);
}
if (drvdata->fuse_v3) {
if (config0 & ALL_DEBUG_DISABLE_V3)
ret = true;
else if (config1 & APPS_DBGEN_DISABLE_V3)
ret = true;
else if (config1 & APPS_NIDEN_DISABLE_V3)
ret = true;
else if (config2 & APPS_SPIDEN_DISABLE_V3)
ret = true;
else if (config1 & APPS_SPNIDEN_DISABLE_V3)
ret = true;
else if (config1 & DAP_DEVICEEN_DISABLE_V3)
ret = true;
} else if (drvdata->fuse_v2) {
if (config1 & ALL_DEBUG_DISABLE_V2)
ret = true;
else if (config1 & APPS_DBGEN_DISABLE_V2)
ret = true;
else if (config1 & APPS_NIDEN_DISABLE_V2)
ret = true;
else if (config1 & APPS_SPIDEN_DISABLE_V2)
ret = true;
else if (config1 & APPS_SPNIDEN_DISABLE_V2)
ret = true;
else if (config1 & DAP_DEVICEEN_DISABLE_V2)
ret = true;
} else {
if (config0 & ALL_DEBUG_DISABLE)
ret = true;
else if (config1 & APPS_DBGEN_DISABLE)
ret = true;
else if (config1 & APPS_NIDEN_DISABLE)
ret = true;
else if (config1 & APPS_SPIDEN_DISABLE)
ret = true;
else if (config1 & APPS_SPNIDEN_DISABLE)
ret = true;
else if (config1 & DAP_DEVICEEN_DISABLE)
ret = true;
}
if (ret)
dev_dbg(drvdata->dev, "apps fuse disabled\n");
return ret;
}
EXPORT_SYMBOL(msm_jtag_fuse_apps_access_disabled);
static struct of_device_id jtag_fuse_match[] = {
{.compatible = JTAG_FUSE_VERSION_V1 },
{.compatible = JTAG_FUSE_VERSION_V2 },
{.compatible = JTAG_FUSE_VERSION_V3 },
{}
};
static int jtag_fuse_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct fuse_drvdata *drvdata;
struct resource *res;
const struct of_device_id *match;
drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
if (!drvdata)
return -ENOMEM;
/* Store the driver data pointer for use in exported functions */
fusedrvdata = drvdata;
drvdata->dev = &pdev->dev;
platform_set_drvdata(pdev, drvdata);
match = of_match_device(jtag_fuse_match, dev);
if (!match)
return -EINVAL;
if (!strcmp(match->compatible, JTAG_FUSE_VERSION_V2))
drvdata->fuse_v2 = true;
else if (!strcmp(match->compatible, JTAG_FUSE_VERSION_V3))
drvdata->fuse_v3 = true;
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "fuse-base");
if (!res)
return -ENODEV;
drvdata->base = devm_ioremap(dev, res->start, resource_size(res));
if (!drvdata->base)
return -ENOMEM;
dev_info(dev, "JTag Fuse initialized\n");
return 0;
}
static int jtag_fuse_remove(struct platform_device *pdev)
{
return 0;
}
static struct platform_driver jtag_fuse_driver = {
.probe = jtag_fuse_probe,
.remove = jtag_fuse_remove,
.driver = {
.name = "msm-jtag-fuse",
.owner = THIS_MODULE,
.of_match_table = jtag_fuse_match,
},
};
static int __init jtag_fuse_init(void)
{
return platform_driver_register(&jtag_fuse_driver);
}
arch_initcall(jtag_fuse_init);
static void __exit jtag_fuse_exit(void)
{
platform_driver_unregister(&jtag_fuse_driver);
}
module_exit(jtag_fuse_exit);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("JTag Fuse driver");
|
