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
28struct 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
34struct exynos_chipid_info {
35 u32 product_id;
36 u32 revision;
37};
38
39static 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
65static 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
75static 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(map: regmap, EXYNOS_CHIPID_REG_PRO_ID, val: &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(map: regmap, reg: data->rev_reg, val: &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
99static 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(dev: &pdev->dev);
110 if (!drv_data)
111 return -EINVAL;
112
113 regmap = device_node_to_regmap(np: pdev->dev.of_node);
114 if (IS_ERR(ptr: regmap))
115 return PTR_ERR(ptr: regmap);
116
117 ret = exynos_chipid_get_chipid_info(regmap, data: drv_data, soc_info: &soc_info);
118 if (ret < 0)
119 return ret;
120
121 soc_dev_attr = devm_kzalloc(dev: &pdev->dev, size: 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(path: "/");
129 of_property_read_string(np: root, propname: "model", out_string: &soc_dev_attr->machine);
130 of_node_put(node: root);
131
132 soc_dev_attr->revision = devm_kasprintf(dev: &pdev->dev, GFP_KERNEL,
133 fmt: "%x", soc_info.revision);
134 soc_dev_attr->soc_id = product_id_to_soc_id(product_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_plat_dev_attr: soc_dev_attr);
142 if (IS_ERR(ptr: soc_dev))
143 return PTR_ERR(ptr: soc_dev);
144
145 ret = exynos_asv_init(dev: &pdev->dev, regmap);
146 if (ret)
147 goto err;
148
149 platform_set_drvdata(pdev, data: 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
156err:
157 soc_device_unregister(soc_dev);
158
159 return ret;
160}
161
162static 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
169static 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
175static 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
181static 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};
191MODULE_DEVICE_TABLE(of, exynos_chipid_of_device_ids);
192
193static 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};
201module_platform_driver(exynos_chipid_driver);
202
203MODULE_DESCRIPTION("Samsung Exynos ChipID controller and ASV driver");
204MODULE_AUTHOR("Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>");
205MODULE_AUTHOR("Krzysztof Kozlowski <krzk@kernel.org>");
206MODULE_AUTHOR("Pankaj Dubey <pankaj.dubey@samsung.com>");
207MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
208MODULE_LICENSE("GPL");
209

source code of linux/drivers/soc/samsung/exynos-chipid.c