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 | { "EXYNOSAUTOV920" , 0x0A920000 }, |
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(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 | |
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(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 | |
156 | err: |
157 | soc_device_unregister(soc_dev); |
158 | |
159 | return ret; |
160 | } |
161 | |
162 | static 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 | |
169 | static 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 | |
175 | static 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 | |
181 | static 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 | }; |
191 | MODULE_DEVICE_TABLE(of, exynos_chipid_of_device_ids); |
192 | |
193 | static 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 | }; |
201 | module_platform_driver(exynos_chipid_driver); |
202 | |
203 | MODULE_DESCRIPTION("Samsung Exynos ChipID controller and ASV driver" ); |
204 | MODULE_AUTHOR("Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>" ); |
205 | MODULE_AUTHOR("Krzysztof Kozlowski <krzk@kernel.org>" ); |
206 | MODULE_AUTHOR("Pankaj Dubey <pankaj.dubey@samsung.com>" ); |
207 | MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>" ); |
208 | MODULE_LICENSE("GPL" ); |
209 | |