1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (c) 2019 Samsung Electronics Co., Ltd.
4 * http://www.samsung.com/
5 * Copyright (c) 2020 Krzysztof Kozlowski <krzk@kernel.org>
6 *
7 * Exynos - CHIP ID support
8 * Author: Pankaj Dubey <pankaj.dubey@samsung.com>
9 * Author: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
10 * Author: Krzysztof Kozlowski <krzk@kernel.org>
11 *
12 * Samsung Exynos SoC Adaptive Supply Voltage and Chip ID support
13 */
14
15 #include <linux/array_size.h>
16 #include <linux/device.h>
17 #include <linux/errno.h>
18 #include <linux/mfd/syscon.h>
19 #include <linux/module.h>
20 #include <linux/of.h>
21 #include <linux/platform_device.h>
22 #include <linux/regmap.h>
23 #include <linux/slab.h>
24 #include <linux/soc/samsung/exynos-chipid.h>
25 #include <linux/sys_soc.h>
26
27 #include "exynos-asv.h"
28
29 struct exynos_chipid_variant {
30 unsigned int rev_reg; /* revision register offset */
31 unsigned int main_rev_shift; /* main revision offset in rev_reg */
32 unsigned int sub_rev_shift; /* sub revision offset in rev_reg */
33 };
34
35 struct exynos_chipid_info {
36 u32 product_id;
37 u32 revision;
38 };
39
40 static const struct exynos_soc_id {
41 const char *name;
42 unsigned int id;
43 } soc_ids[] = {
44 /* List ordered by SoC name */
45 /* Compatible with: samsung,exynos4210-chipid */
46 { "EXYNOS3250", 0xE3472000 },
47 { "EXYNOS4210", 0x43200000 }, /* EVT0 revision */
48 { "EXYNOS4210", 0x43210000 },
49 { "EXYNOS4212", 0x43220000 },
50 { "EXYNOS4412", 0xE4412000 },
51 { "EXYNOS5250", 0x43520000 },
52 { "EXYNOS5260", 0xE5260000 },
53 { "EXYNOS5410", 0xE5410000 },
54 { "EXYNOS5420", 0xE5420000 },
55 { "EXYNOS5433", 0xE5433000 },
56 { "EXYNOS5440", 0xE5440000 },
57 { "EXYNOS5800", 0xE5422000 },
58 { "EXYNOS7420", 0xE7420000 },
59 { "EXYNOS7870", 0xE7870000 },
60 { "EXYNOS8890", 0xE8890000 },
61 /* Compatible with: samsung,exynos850-chipid */
62 { "EXYNOS2200", 0xE9925000 },
63 { "EXYNOS7885", 0xE7885000 },
64 { "EXYNOS850", 0xE3830000 },
65 { "EXYNOS8895", 0xE8895000 },
66 { "EXYNOS9610", 0xE9610000 },
67 { "EXYNOS9810", 0xE9810000 },
68 { "EXYNOS990", 0xE9830000 },
69 { "EXYNOSAUTOV9", 0xAAA80000 },
70 { "EXYNOSAUTOV920", 0x0A920000 },
71 };
72
product_id_to_soc_id(unsigned int product_id)73 static const char *product_id_to_soc_id(unsigned int product_id)
74 {
75 int i;
76
77 for (i = 0; i < ARRAY_SIZE(soc_ids); i++)
78 if (product_id == soc_ids[i].id)
79 return soc_ids[i].name;
80 return NULL;
81 }
82
exynos_chipid_get_chipid_info(struct regmap * regmap,const struct exynos_chipid_variant * data,struct exynos_chipid_info * soc_info)83 static int exynos_chipid_get_chipid_info(struct regmap *regmap,
84 const struct exynos_chipid_variant *data,
85 struct exynos_chipid_info *soc_info)
86 {
87 int ret;
88 unsigned int val, main_rev, sub_rev;
89
90 ret = regmap_read(regmap, EXYNOS_CHIPID_REG_PRO_ID, &val);
91 if (ret < 0)
92 return ret;
93 soc_info->product_id = val & EXYNOS_MASK;
94
95 if (data->rev_reg != EXYNOS_CHIPID_REG_PRO_ID) {
96 ret = regmap_read(regmap, data->rev_reg, &val);
97 if (ret < 0)
98 return ret;
99 }
100 main_rev = (val >> data->main_rev_shift) & EXYNOS_REV_PART_MASK;
101 sub_rev = (val >> data->sub_rev_shift) & EXYNOS_REV_PART_MASK;
102 soc_info->revision = (main_rev << EXYNOS_REV_PART_SHIFT) | sub_rev;
103
104 return 0;
105 }
106
exynos_chipid_probe(struct platform_device * pdev)107 static int exynos_chipid_probe(struct platform_device *pdev)
108 {
109 const struct exynos_chipid_variant *drv_data;
110 struct exynos_chipid_info soc_info;
111 struct soc_device_attribute *soc_dev_attr;
112 struct device *dev = &pdev->dev;
113 struct soc_device *soc_dev;
114 struct device_node *root;
115 struct regmap *regmap;
116 int ret;
117
118 drv_data = of_device_get_match_data(dev);
119 if (!drv_data)
120 return -EINVAL;
121
122 regmap = device_node_to_regmap(dev->of_node);
123 if (IS_ERR(regmap))
124 return PTR_ERR(regmap);
125
126 ret = exynos_chipid_get_chipid_info(regmap, drv_data, &soc_info);
127 if (ret < 0)
128 return ret;
129
130 soc_dev_attr = devm_kzalloc(dev, sizeof(*soc_dev_attr), GFP_KERNEL);
131 if (!soc_dev_attr)
132 return -ENOMEM;
133
134 soc_dev_attr->family = "Samsung Exynos";
135
136 root = of_find_node_by_path("/");
137 of_property_read_string(root, "model", &soc_dev_attr->machine);
138 of_node_put(root);
139
140 soc_dev_attr->revision = devm_kasprintf(dev, GFP_KERNEL, "%x",
141 soc_info.revision);
142 if (!soc_dev_attr->revision)
143 return -ENOMEM;
144 soc_dev_attr->soc_id = product_id_to_soc_id(soc_info.product_id);
145 if (!soc_dev_attr->soc_id) {
146 pr_err("Unknown SoC\n");
147 return -ENODEV;
148 }
149
150 /* please note that the actual registration will be deferred */
151 soc_dev = soc_device_register(soc_dev_attr);
152 if (IS_ERR(soc_dev))
153 return PTR_ERR(soc_dev);
154
155 ret = exynos_asv_init(dev, regmap);
156 if (ret)
157 goto err;
158
159 platform_set_drvdata(pdev, soc_dev);
160
161 dev_info(dev, "Exynos: CPU[%s] PRO_ID[0x%x] REV[0x%x] Detected\n",
162 soc_dev_attr->soc_id, soc_info.product_id, soc_info.revision);
163
164 return 0;
165
166 err:
167 soc_device_unregister(soc_dev);
168
169 return ret;
170 }
171
exynos_chipid_remove(struct platform_device * pdev)172 static void exynos_chipid_remove(struct platform_device *pdev)
173 {
174 struct soc_device *soc_dev = platform_get_drvdata(pdev);
175
176 soc_device_unregister(soc_dev);
177 }
178
179 static const struct exynos_chipid_variant exynos4210_chipid_drv_data = {
180 .rev_reg = 0x0,
181 .main_rev_shift = 4,
182 .sub_rev_shift = 0,
183 };
184
185 static const struct exynos_chipid_variant exynos850_chipid_drv_data = {
186 .rev_reg = 0x10,
187 .main_rev_shift = 20,
188 .sub_rev_shift = 16,
189 };
190
191 static const struct of_device_id exynos_chipid_of_device_ids[] = {
192 {
193 .compatible = "samsung,exynos4210-chipid",
194 .data = &exynos4210_chipid_drv_data,
195 }, {
196 .compatible = "samsung,exynos850-chipid",
197 .data = &exynos850_chipid_drv_data,
198 },
199 { }
200 };
201 MODULE_DEVICE_TABLE(of, exynos_chipid_of_device_ids);
202
203 static struct platform_driver exynos_chipid_driver = {
204 .driver = {
205 .name = "exynos-chipid",
206 .of_match_table = exynos_chipid_of_device_ids,
207 },
208 .probe = exynos_chipid_probe,
209 .remove = exynos_chipid_remove,
210 };
211 module_platform_driver(exynos_chipid_driver);
212
213 MODULE_DESCRIPTION("Samsung Exynos ChipID controller and ASV driver");
214 MODULE_AUTHOR("Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>");
215 MODULE_AUTHOR("Krzysztof Kozlowski <krzk@kernel.org>");
216 MODULE_AUTHOR("Pankaj Dubey <pankaj.dubey@samsung.com>");
217 MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
218 MODULE_LICENSE("GPL");
219