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