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 	/* 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 },
63 };
64 
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 
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 
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 
162 static int 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 	return 0;
169 }
170 
171 static const struct exynos_chipid_variant exynos4210_chipid_drv_data = {
172 	.rev_reg	= 0x0,
173 	.main_rev_shift	= 4,
174 	.sub_rev_shift	= 0,
175 };
176 
177 static const struct exynos_chipid_variant exynos850_chipid_drv_data = {
178 	.rev_reg	= 0x10,
179 	.main_rev_shift	= 20,
180 	.sub_rev_shift	= 16,
181 };
182 
183 static const struct of_device_id exynos_chipid_of_device_ids[] = {
184 	{
185 		.compatible	= "samsung,exynos4210-chipid",
186 		.data		= &exynos4210_chipid_drv_data,
187 	}, {
188 		.compatible	= "samsung,exynos850-chipid",
189 		.data		= &exynos850_chipid_drv_data,
190 	},
191 	{ }
192 };
193 MODULE_DEVICE_TABLE(of, exynos_chipid_of_device_ids);
194 
195 static struct platform_driver exynos_chipid_driver = {
196 	.driver = {
197 		.name = "exynos-chipid",
198 		.of_match_table = exynos_chipid_of_device_ids,
199 	},
200 	.probe	= exynos_chipid_probe,
201 	.remove	= exynos_chipid_remove,
202 };
203 module_platform_driver(exynos_chipid_driver);
204 
205 MODULE_DESCRIPTION("Samsung Exynos ChipID controller and ASV driver");
206 MODULE_AUTHOR("Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>");
207 MODULE_AUTHOR("Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>");
208 MODULE_AUTHOR("Pankaj Dubey <pankaj.dubey@samsung.com>");
209 MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
210 MODULE_LICENSE("GPL");
211