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/of_device.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 { "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 { "EXYNOS850", 0xE3830000 },
59 { "EXYNOSAUTOV9", 0xAAA80000 },
60 };
61
product_id_to_soc_id(unsigned int product_id)62 static const char *product_id_to_soc_id(unsigned int product_id)
63 {
64 int i;
65
66 for (i = 0; i < ARRAY_SIZE(soc_ids); i++)
67 if (product_id == soc_ids[i].id)
68 return soc_ids[i].name;
69 return NULL;
70 }
71
exynos_chipid_get_chipid_info(struct regmap * regmap,const struct exynos_chipid_variant * data,struct exynos_chipid_info * soc_info)72 static int exynos_chipid_get_chipid_info(struct regmap *regmap,
73 const struct exynos_chipid_variant *data,
74 struct exynos_chipid_info *soc_info)
75 {
76 int ret;
77 unsigned int val, main_rev, sub_rev;
78
79 ret = regmap_read(regmap, EXYNOS_CHIPID_REG_PRO_ID, &val);
80 if (ret < 0)
81 return ret;
82 soc_info->product_id = val & EXYNOS_MASK;
83
84 if (data->rev_reg != EXYNOS_CHIPID_REG_PRO_ID) {
85 ret = regmap_read(regmap, data->rev_reg, &val);
86 if (ret < 0)
87 return ret;
88 }
89 main_rev = (val >> data->main_rev_shift) & EXYNOS_REV_PART_MASK;
90 sub_rev = (val >> data->sub_rev_shift) & EXYNOS_REV_PART_MASK;
91 soc_info->revision = (main_rev << EXYNOS_REV_PART_SHIFT) | sub_rev;
92
93 return 0;
94 }
95
exynos_chipid_probe(struct platform_device * pdev)96 static int exynos_chipid_probe(struct platform_device *pdev)
97 {
98 const struct exynos_chipid_variant *drv_data;
99 struct exynos_chipid_info soc_info;
100 struct soc_device_attribute *soc_dev_attr;
101 struct soc_device *soc_dev;
102 struct device_node *root;
103 struct regmap *regmap;
104 int ret;
105
106 drv_data = of_device_get_match_data(&pdev->dev);
107 if (!drv_data)
108 return -EINVAL;
109
110 regmap = device_node_to_regmap(pdev->dev.of_node);
111 if (IS_ERR(regmap))
112 return PTR_ERR(regmap);
113
114 ret = exynos_chipid_get_chipid_info(regmap, drv_data, &soc_info);
115 if (ret < 0)
116 return ret;
117
118 soc_dev_attr = devm_kzalloc(&pdev->dev, sizeof(*soc_dev_attr),
119 GFP_KERNEL);
120 if (!soc_dev_attr)
121 return -ENOMEM;
122
123 soc_dev_attr->family = "Samsung Exynos";
124
125 root = of_find_node_by_path("/");
126 of_property_read_string(root, "model", &soc_dev_attr->machine);
127 of_node_put(root);
128
129 soc_dev_attr->revision = devm_kasprintf(&pdev->dev, GFP_KERNEL,
130 "%x", soc_info.revision);
131 soc_dev_attr->soc_id = product_id_to_soc_id(soc_info.product_id);
132 if (!soc_dev_attr->soc_id) {
133 pr_err("Unknown SoC\n");
134 return -ENODEV;
135 }
136
137 /* please note that the actual registration will be deferred */
138 soc_dev = soc_device_register(soc_dev_attr);
139 if (IS_ERR(soc_dev))
140 return PTR_ERR(soc_dev);
141
142 ret = exynos_asv_init(&pdev->dev, regmap);
143 if (ret)
144 goto err;
145
146 platform_set_drvdata(pdev, soc_dev);
147
148 dev_info(&pdev->dev, "Exynos: CPU[%s] PRO_ID[0x%x] REV[0x%x] Detected\n",
149 soc_dev_attr->soc_id, soc_info.product_id, soc_info.revision);
150
151 return 0;
152
153 err:
154 soc_device_unregister(soc_dev);
155
156 return ret;
157 }
158
exynos_chipid_remove(struct platform_device * pdev)159 static int exynos_chipid_remove(struct platform_device *pdev)
160 {
161 struct soc_device *soc_dev = platform_get_drvdata(pdev);
162
163 soc_device_unregister(soc_dev);
164
165 return 0;
166 }
167
168 static const struct exynos_chipid_variant exynos4210_chipid_drv_data = {
169 .rev_reg = 0x0,
170 .main_rev_shift = 4,
171 .sub_rev_shift = 0,
172 };
173
174 static const struct exynos_chipid_variant exynos850_chipid_drv_data = {
175 .rev_reg = 0x10,
176 .main_rev_shift = 20,
177 .sub_rev_shift = 16,
178 };
179
180 static const struct of_device_id exynos_chipid_of_device_ids[] = {
181 {
182 .compatible = "samsung,exynos4210-chipid",
183 .data = &exynos4210_chipid_drv_data,
184 }, {
185 .compatible = "samsung,exynos850-chipid",
186 .data = &exynos850_chipid_drv_data,
187 },
188 { }
189 };
190 MODULE_DEVICE_TABLE(of, exynos_chipid_of_device_ids);
191
192 static struct platform_driver exynos_chipid_driver = {
193 .driver = {
194 .name = "exynos-chipid",
195 .of_match_table = exynos_chipid_of_device_ids,
196 },
197 .probe = exynos_chipid_probe,
198 .remove = exynos_chipid_remove,
199 };
200 module_platform_driver(exynos_chipid_driver);
201
202 MODULE_DESCRIPTION("Samsung Exynos ChipID controller and ASV driver");
203 MODULE_AUTHOR("Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>");
204 MODULE_AUTHOR("Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>");
205 MODULE_AUTHOR("Pankaj Dubey <pankaj.dubey@samsung.com>");
206 MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
207 MODULE_LICENSE("GPL");
208