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 /* Compatible with: samsung,exynos850-chipid */
61 { "EXYNOS2200", 0xE9925000 },
62 { "EXYNOS7885", 0xE7885000 },
63 { "EXYNOS850", 0xE3830000 },
64 { "EXYNOS8895", 0xE8895000 },
65 { "EXYNOS9810", 0xE9810000 },
66 { "EXYNOS990", 0xE9830000 },
67 { "EXYNOSAUTOV9", 0xAAA80000 },
68 { "EXYNOSAUTOV920", 0x0A920000 },
69 };
70
product_id_to_soc_id(unsigned int product_id)71 static const char *product_id_to_soc_id(unsigned int product_id)
72 {
73 int i;
74
75 for (i = 0; i < ARRAY_SIZE(soc_ids); i++)
76 if (product_id == soc_ids[i].id)
77 return soc_ids[i].name;
78 return NULL;
79 }
80
exynos_chipid_get_chipid_info(struct regmap * regmap,const struct exynos_chipid_variant * data,struct exynos_chipid_info * soc_info)81 static int exynos_chipid_get_chipid_info(struct regmap *regmap,
82 const struct exynos_chipid_variant *data,
83 struct exynos_chipid_info *soc_info)
84 {
85 int ret;
86 unsigned int val, main_rev, sub_rev;
87
88 ret = regmap_read(regmap, EXYNOS_CHIPID_REG_PRO_ID, &val);
89 if (ret < 0)
90 return ret;
91 soc_info->product_id = val & EXYNOS_MASK;
92
93 if (data->rev_reg != EXYNOS_CHIPID_REG_PRO_ID) {
94 ret = regmap_read(regmap, data->rev_reg, &val);
95 if (ret < 0)
96 return ret;
97 }
98 main_rev = (val >> data->main_rev_shift) & EXYNOS_REV_PART_MASK;
99 sub_rev = (val >> data->sub_rev_shift) & EXYNOS_REV_PART_MASK;
100 soc_info->revision = (main_rev << EXYNOS_REV_PART_SHIFT) | sub_rev;
101
102 return 0;
103 }
104
exynos_chipid_probe(struct platform_device * pdev)105 static int exynos_chipid_probe(struct platform_device *pdev)
106 {
107 const struct exynos_chipid_variant *drv_data;
108 struct exynos_chipid_info soc_info;
109 struct soc_device_attribute *soc_dev_attr;
110 struct soc_device *soc_dev;
111 struct device_node *root;
112 struct regmap *regmap;
113 int ret;
114
115 drv_data = of_device_get_match_data(&pdev->dev);
116 if (!drv_data)
117 return -EINVAL;
118
119 regmap = device_node_to_regmap(pdev->dev.of_node);
120 if (IS_ERR(regmap))
121 return PTR_ERR(regmap);
122
123 ret = exynos_chipid_get_chipid_info(regmap, drv_data, &soc_info);
124 if (ret < 0)
125 return ret;
126
127 soc_dev_attr = devm_kzalloc(&pdev->dev, sizeof(*soc_dev_attr),
128 GFP_KERNEL);
129 if (!soc_dev_attr)
130 return -ENOMEM;
131
132 soc_dev_attr->family = "Samsung Exynos";
133
134 root = of_find_node_by_path("/");
135 of_property_read_string(root, "model", &soc_dev_attr->machine);
136 of_node_put(root);
137
138 soc_dev_attr->revision = devm_kasprintf(&pdev->dev, GFP_KERNEL,
139 "%x", soc_info.revision);
140 if (!soc_dev_attr->revision)
141 return -ENOMEM;
142 soc_dev_attr->soc_id = product_id_to_soc_id(soc_info.product_id);
143 if (!soc_dev_attr->soc_id) {
144 pr_err("Unknown SoC\n");
145 return -ENODEV;
146 }
147
148 /* please note that the actual registration will be deferred */
149 soc_dev = soc_device_register(soc_dev_attr);
150 if (IS_ERR(soc_dev))
151 return PTR_ERR(soc_dev);
152
153 ret = exynos_asv_init(&pdev->dev, regmap);
154 if (ret)
155 goto err;
156
157 platform_set_drvdata(pdev, soc_dev);
158
159 dev_info(&pdev->dev, "Exynos: CPU[%s] PRO_ID[0x%x] REV[0x%x] Detected\n",
160 soc_dev_attr->soc_id, soc_info.product_id, soc_info.revision);
161
162 return 0;
163
164 err:
165 soc_device_unregister(soc_dev);
166
167 return ret;
168 }
169
exynos_chipid_remove(struct platform_device * pdev)170 static void exynos_chipid_remove(struct platform_device *pdev)
171 {
172 struct soc_device *soc_dev = platform_get_drvdata(pdev);
173
174 soc_device_unregister(soc_dev);
175 }
176
177 static const struct exynos_chipid_variant exynos4210_chipid_drv_data = {
178 .rev_reg = 0x0,
179 .main_rev_shift = 4,
180 .sub_rev_shift = 0,
181 };
182
183 static const struct exynos_chipid_variant exynos850_chipid_drv_data = {
184 .rev_reg = 0x10,
185 .main_rev_shift = 20,
186 .sub_rev_shift = 16,
187 };
188
189 static const struct of_device_id exynos_chipid_of_device_ids[] = {
190 {
191 .compatible = "samsung,exynos4210-chipid",
192 .data = &exynos4210_chipid_drv_data,
193 }, {
194 .compatible = "samsung,exynos850-chipid",
195 .data = &exynos850_chipid_drv_data,
196 },
197 { }
198 };
199 MODULE_DEVICE_TABLE(of, exynos_chipid_of_device_ids);
200
201 static struct platform_driver exynos_chipid_driver = {
202 .driver = {
203 .name = "exynos-chipid",
204 .of_match_table = exynos_chipid_of_device_ids,
205 },
206 .probe = exynos_chipid_probe,
207 .remove = exynos_chipid_remove,
208 };
209 module_platform_driver(exynos_chipid_driver);
210
211 MODULE_DESCRIPTION("Samsung Exynos ChipID controller and ASV driver");
212 MODULE_AUTHOR("Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>");
213 MODULE_AUTHOR("Krzysztof Kozlowski <krzk@kernel.org>");
214 MODULE_AUTHOR("Pankaj Dubey <pankaj.dubey@samsung.com>");
215 MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
216 MODULE_LICENSE("GPL");
217