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
|
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2019 Samsung Electronics Co., Ltd.
* http://www.samsung.com/
* Copyright (c) 2020 Krzysztof Kozlowski <krzk@kernel.org>
*
* Exynos - CHIP ID support
* Author: Pankaj Dubey <pankaj.dubey@samsung.com>
* Author: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
* Author: Krzysztof Kozlowski <krzk@kernel.org>
*
* Samsung Exynos SoC Adaptive Supply Voltage and Chip ID support
*/
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <linux/soc/samsung/exynos-chipid.h>
#include <linux/sys_soc.h>
#include "exynos-asv.h"
struct exynos_chipid_variant {
unsigned int rev_reg; /* revision register offset */
unsigned int main_rev_shift; /* main revision offset in rev_reg */
unsigned int sub_rev_shift; /* sub revision offset in rev_reg */
};
struct exynos_chipid_info {
u32 product_id;
u32 revision;
};
static const struct exynos_soc_id {
const char *name;
unsigned int id;
} soc_ids[] = {
/* List ordered by SoC name */
/* Compatible with: samsung,exynos4210-chipid */
{ "EXYNOS3250", 0xE3472000 },
{ "EXYNOS4210", 0x43200000 }, /* EVT0 revision */
{ "EXYNOS4210", 0x43210000 },
{ "EXYNOS4212", 0x43220000 },
{ "EXYNOS4412", 0xE4412000 },
{ "EXYNOS5250", 0x43520000 },
{ "EXYNOS5260", 0xE5260000 },
{ "EXYNOS5410", 0xE5410000 },
{ "EXYNOS5420", 0xE5420000 },
{ "EXYNOS5433", 0xE5433000 },
{ "EXYNOS5440", 0xE5440000 },
{ "EXYNOS5800", 0xE5422000 },
{ "EXYNOS7420", 0xE7420000 },
/* Compatible with: samsung,exynos850-chipid */
{ "EXYNOS7885", 0xE7885000 },
{ "EXYNOS850", 0xE3830000 },
{ "EXYNOSAUTOV9", 0xAAA80000 },
};
static const char *product_id_to_soc_id(unsigned int product_id)
{
int i;
for (i = 0; i < ARRAY_SIZE(soc_ids); i++)
if (product_id == soc_ids[i].id)
return soc_ids[i].name;
return NULL;
}
static int exynos_chipid_get_chipid_info(struct regmap *regmap,
const struct exynos_chipid_variant *data,
struct exynos_chipid_info *soc_info)
{
int ret;
unsigned int val, main_rev, sub_rev;
ret = regmap_read(regmap, EXYNOS_CHIPID_REG_PRO_ID, &val);
if (ret < 0)
return ret;
soc_info->product_id = val & EXYNOS_MASK;
if (data->rev_reg != EXYNOS_CHIPID_REG_PRO_ID) {
ret = regmap_read(regmap, data->rev_reg, &val);
if (ret < 0)
return ret;
}
main_rev = (val >> data->main_rev_shift) & EXYNOS_REV_PART_MASK;
sub_rev = (val >> data->sub_rev_shift) & EXYNOS_REV_PART_MASK;
soc_info->revision = (main_rev << EXYNOS_REV_PART_SHIFT) | sub_rev;
return 0;
}
static int exynos_chipid_probe(struct platform_device *pdev)
{
const struct exynos_chipid_variant *drv_data;
struct exynos_chipid_info soc_info;
struct soc_device_attribute *soc_dev_attr;
struct soc_device *soc_dev;
struct device_node *root;
struct regmap *regmap;
int ret;
drv_data = of_device_get_match_data(&pdev->dev);
if (!drv_data)
return -EINVAL;
regmap = device_node_to_regmap(pdev->dev.of_node);
if (IS_ERR(regmap))
return PTR_ERR(regmap);
ret = exynos_chipid_get_chipid_info(regmap, drv_data, &soc_info);
if (ret < 0)
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 = "Samsung Exynos";
root = of_find_node_by_path("/");
of_property_read_string(root, "model", &soc_dev_attr->machine);
of_node_put(root);
soc_dev_attr->revision = devm_kasprintf(&pdev->dev, GFP_KERNEL,
"%x", soc_info.revision);
soc_dev_attr->soc_id = product_id_to_soc_id(soc_info.product_id);
if (!soc_dev_attr->soc_id) {
pr_err("Unknown SoC\n");
return -ENODEV;
}
/* please note that the actual registration will be deferred */
soc_dev = soc_device_register(soc_dev_attr);
if (IS_ERR(soc_dev))
return PTR_ERR(soc_dev);
ret = exynos_asv_init(&pdev->dev, regmap);
if (ret)
goto err;
platform_set_drvdata(pdev, soc_dev);
dev_info(&pdev->dev, "Exynos: CPU[%s] PRO_ID[0x%x] REV[0x%x] Detected\n",
soc_dev_attr->soc_id, soc_info.product_id, soc_info.revision);
return 0;
err:
soc_device_unregister(soc_dev);
return ret;
}
static int exynos_chipid_remove(struct platform_device *pdev)
{
struct soc_device *soc_dev = platform_get_drvdata(pdev);
soc_device_unregister(soc_dev);
return 0;
}
static const struct exynos_chipid_variant exynos4210_chipid_drv_data = {
.rev_reg = 0x0,
.main_rev_shift = 4,
.sub_rev_shift = 0,
};
static const struct exynos_chipid_variant exynos850_chipid_drv_data = {
.rev_reg = 0x10,
.main_rev_shift = 20,
.sub_rev_shift = 16,
};
static const struct of_device_id exynos_chipid_of_device_ids[] = {
{
.compatible = "samsung,exynos4210-chipid",
.data = &exynos4210_chipid_drv_data,
}, {
.compatible = "samsung,exynos850-chipid",
.data = &exynos850_chipid_drv_data,
},
{ }
};
MODULE_DEVICE_TABLE(of, exynos_chipid_of_device_ids);
static struct platform_driver exynos_chipid_driver = {
.driver = {
.name = "exynos-chipid",
.of_match_table = exynos_chipid_of_device_ids,
},
.probe = exynos_chipid_probe,
.remove = exynos_chipid_remove,
};
module_platform_driver(exynos_chipid_driver);
MODULE_DESCRIPTION("Samsung Exynos ChipID controller and ASV driver");
MODULE_AUTHOR("Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>");
MODULE_AUTHOR("Krzysztof Kozlowski <krzk@kernel.org>");
MODULE_AUTHOR("Pankaj Dubey <pankaj.dubey@samsung.com>");
MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
MODULE_LICENSE("GPL");
|
