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