1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (c) 2019 Samsung Electronics Co., Ltd.
4 * http://www.samsung.com/
7 * Exynos - CHIP ID support
12 * Samsung Exynos SoC Adaptive Supply Voltage and Chip ID support
15 #include <linux/device.h>
16 #include <linux/errno.h>
17 #include <linux/mfd/syscon.h>
18 #include <linux/module.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>
27 #include "exynos-asv.h"
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 */
35 struct exynos_chipid_info {
40 static const struct exynos_soc_id {
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 /* Compatible with: samsung,exynos850-chipid */
60 { "EXYNOS7885", 0xE7885000 },
61 { "EXYNOS850", 0xE3830000 },
62 { "EXYNOSAUTOV9", 0xAAA80000 },
65 static const char *product_id_to_soc_id(unsigned int product_id)
69 for (i = 0; i < ARRAY_SIZE(soc_ids); i++)
70 if (product_id == soc_ids[i].id)
71 return soc_ids[i].name;
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)
80 unsigned int val, main_rev, sub_rev;
82 ret = regmap_read(regmap, EXYNOS_CHIPID_REG_PRO_ID, &val);
85 soc_info->product_id = val & EXYNOS_MASK;
87 if (data->rev_reg != EXYNOS_CHIPID_REG_PRO_ID) {
88 ret = regmap_read(regmap, data->rev_reg, &val);
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;
99 static int exynos_chipid_probe(struct platform_device *pdev)
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;
109 drv_data = of_device_get_match_data(&pdev->dev);
113 regmap = device_node_to_regmap(pdev->dev.of_node);
115 return PTR_ERR(regmap);
117 ret = exynos_chipid_get_chipid_info(regmap, drv_data, &soc_info);
121 soc_dev_attr = devm_kzalloc(&pdev->dev, sizeof(*soc_dev_attr),
126 soc_dev_attr->family = "Samsung Exynos";
128 root = of_find_node_by_path("/");
129 of_property_read_string(root, "model", &soc_dev_attr->machine);
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");
140 /* please note that the actual registration will be deferred */
141 soc_dev = soc_device_register(soc_dev_attr);
143 return PTR_ERR(soc_dev);
145 ret = exynos_asv_init(&pdev->dev, regmap);
149 platform_set_drvdata(pdev, soc_dev);
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);
157 soc_device_unregister(soc_dev);
162 static int exynos_chipid_remove(struct platform_device *pdev)
164 struct soc_device *soc_dev = platform_get_drvdata(pdev);
166 soc_device_unregister(soc_dev);
171 static const struct exynos_chipid_variant exynos4210_chipid_drv_data = {
177 static const struct exynos_chipid_variant exynos850_chipid_drv_data = {
179 .main_rev_shift = 20,
183 static const struct of_device_id exynos_chipid_of_device_ids[] = {
185 .compatible = "samsung,exynos4210-chipid",
186 .data = &exynos4210_chipid_drv_data,
188 .compatible = "samsung,exynos850-chipid",
189 .data = &exynos850_chipid_drv_data,
193 MODULE_DEVICE_TABLE(of, exynos_chipid_of_device_ids);
195 static struct platform_driver exynos_chipid_driver = {
197 .name = "exynos-chipid",
198 .of_match_table = exynos_chipid_of_device_ids,
200 .probe = exynos_chipid_probe,
201 .remove = exynos_chipid_remove,
203 module_platform_driver(exynos_chipid_driver);
205 MODULE_DESCRIPTION("Samsung Exynos ChipID controller and ASV driver");
210 MODULE_LICENSE("GPL");