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3253b7b7 PD |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
3 | * Copyright (c) 2019 Samsung Electronics Co., Ltd. | |
4 | * http://www.samsung.com/ | |
352bfbb3 | 5 | * Copyright (c) 2020 Krzysztof Kozlowski <krzk@kernel.org> |
3253b7b7 | 6 | * |
94500540 | 7 | * Exynos - CHIP ID support |
3253b7b7 PD |
8 | * Author: Pankaj Dubey <pankaj.dubey@samsung.com> |
9 | * Author: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> | |
352bfbb3 KK |
10 | * Author: Krzysztof Kozlowski <krzk@kernel.org> |
11 | * | |
12 | * Samsung Exynos SoC Adaptive Supply Voltage and Chip ID support | |
3253b7b7 PD |
13 | */ |
14 | ||
352bfbb3 KK |
15 | #include <linux/device.h> |
16 | #include <linux/errno.h> | |
40d8aff6 | 17 | #include <linux/mfd/syscon.h> |
1e3e559f | 18 | #include <linux/module.h> |
3253b7b7 | 19 | #include <linux/of.h> |
352bfbb3 | 20 | #include <linux/platform_device.h> |
40d8aff6 | 21 | #include <linux/regmap.h> |
3253b7b7 | 22 | #include <linux/slab.h> |
40d8aff6 | 23 | #include <linux/soc/samsung/exynos-chipid.h> |
3253b7b7 PD |
24 | #include <linux/sys_soc.h> |
25 | ||
352bfbb3 KK |
26 | #include "exynos-asv.h" |
27 | ||
c072c4ef SP |
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 | ||
3253b7b7 PD |
39 | static const struct exynos_soc_id { |
40 | const char *name; | |
41 | unsigned int id; | |
42 | } soc_ids[] = { | |
7136d6a9 | 43 | /* List ordered by SoC name */ |
569e45a1 | 44 | /* Compatible with: samsung,exynos4210-chipid */ |
3253b7b7 PD |
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 }, | |
7136d6a9 | 54 | { "EXYNOS5433", 0xE5433000 }, |
3253b7b7 PD |
55 | { "EXYNOS5440", 0xE5440000 }, |
56 | { "EXYNOS5800", 0xE5422000 }, | |
57 | { "EXYNOS7420", 0xE7420000 }, | |
569e45a1 | 58 | /* Compatible with: samsung,exynos850-chipid */ |
214f7806 | 59 | { "EXYNOS7885", 0xE7885000 }, |
81a51eb6 | 60 | { "EXYNOS850", 0xE3830000 }, |
b417d1e8 | 61 | { "EXYNOSAUTOV9", 0xAAA80000 }, |
beea67c7 | 62 | { "EXYNOSAUTOV920", 0x0A920000 }, |
3253b7b7 PD |
63 | }; |
64 | ||
6166174a | 65 | static const char *product_id_to_soc_id(unsigned int product_id) |
3253b7b7 PD |
66 | { |
67 | int i; | |
68 | ||
69 | for (i = 0; i < ARRAY_SIZE(soc_ids); i++) | |
c072c4ef | 70 | if (product_id == soc_ids[i].id) |
3253b7b7 PD |
71 | return soc_ids[i].name; |
72 | return NULL; | |
73 | } | |
74 | ||
c072c4ef SP |
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 | ||
352bfbb3 | 99 | static int exynos_chipid_probe(struct platform_device *pdev) |
3253b7b7 | 100 | { |
c072c4ef SP |
101 | const struct exynos_chipid_variant *drv_data; |
102 | struct exynos_chipid_info soc_info; | |
3253b7b7 | 103 | struct soc_device_attribute *soc_dev_attr; |
3253b7b7 PD |
104 | struct soc_device *soc_dev; |
105 | struct device_node *root; | |
40d8aff6 | 106 | struct regmap *regmap; |
40d8aff6 | 107 | int ret; |
3253b7b7 | 108 | |
c072c4ef SP |
109 | drv_data = of_device_get_match_data(&pdev->dev); |
110 | if (!drv_data) | |
111 | return -EINVAL; | |
112 | ||
352bfbb3 | 113 | regmap = device_node_to_regmap(pdev->dev.of_node); |
82303457 | 114 | if (IS_ERR(regmap)) |
40d8aff6 | 115 | return PTR_ERR(regmap); |
3253b7b7 | 116 | |
c072c4ef | 117 | ret = exynos_chipid_get_chipid_info(regmap, drv_data, &soc_info); |
40d8aff6 SN |
118 | if (ret < 0) |
119 | return ret; | |
120 | ||
352bfbb3 KK |
121 | soc_dev_attr = devm_kzalloc(&pdev->dev, sizeof(*soc_dev_attr), |
122 | GFP_KERNEL); | |
3253b7b7 PD |
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 | ||
352bfbb3 | 132 | soc_dev_attr->revision = devm_kasprintf(&pdev->dev, GFP_KERNEL, |
c072c4ef SP |
133 | "%x", soc_info.revision); |
134 | soc_dev_attr->soc_id = product_id_to_soc_id(soc_info.product_id); | |
3253b7b7 PD |
135 | if (!soc_dev_attr->soc_id) { |
136 | pr_err("Unknown SoC\n"); | |
352bfbb3 | 137 | return -ENODEV; |
3253b7b7 PD |
138 | } |
139 | ||
140 | /* please note that the actual registration will be deferred */ | |
141 | soc_dev = soc_device_register(soc_dev_attr); | |
352bfbb3 KK |
142 | if (IS_ERR(soc_dev)) |
143 | return PTR_ERR(soc_dev); | |
144 | ||
145 | ret = exynos_asv_init(&pdev->dev, regmap); | |
146 | if (ret) | |
3636e821 | 147 | goto err; |
352bfbb3 KK |
148 | |
149 | platform_set_drvdata(pdev, soc_dev); | |
3253b7b7 | 150 | |
d1141886 | 151 | dev_info(&pdev->dev, "Exynos: CPU[%s] PRO_ID[0x%x] REV[0x%x] Detected\n", |
c072c4ef | 152 | soc_dev_attr->soc_id, soc_info.product_id, soc_info.revision); |
3253b7b7 PD |
153 | |
154 | return 0; | |
3636e821 CIK |
155 | |
156 | err: | |
352bfbb3 KK |
157 | soc_device_unregister(soc_dev); |
158 | ||
3636e821 | 159 | return ret; |
3253b7b7 | 160 | } |
3636e821 | 161 | |
55fa358c | 162 | static void exynos_chipid_remove(struct platform_device *pdev) |
352bfbb3 KK |
163 | { |
164 | struct soc_device *soc_dev = platform_get_drvdata(pdev); | |
165 | ||
166 | soc_device_unregister(soc_dev); | |
352bfbb3 KK |
167 | } |
168 | ||
c072c4ef SP |
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 | ||
81a51eb6 SP |
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 | ||
352bfbb3 | 181 | static const struct of_device_id exynos_chipid_of_device_ids[] = { |
c072c4ef SP |
182 | { |
183 | .compatible = "samsung,exynos4210-chipid", | |
184 | .data = &exynos4210_chipid_drv_data, | |
81a51eb6 SP |
185 | }, { |
186 | .compatible = "samsung,exynos850-chipid", | |
187 | .data = &exynos850_chipid_drv_data, | |
c072c4ef SP |
188 | }, |
189 | { } | |
352bfbb3 | 190 | }; |
1e3e559f | 191 | MODULE_DEVICE_TABLE(of, exynos_chipid_of_device_ids); |
352bfbb3 KK |
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, | |
55fa358c | 199 | .remove_new = exynos_chipid_remove, |
352bfbb3 | 200 | }; |
1e3e559f KK |
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>"); | |
5125091d | 205 | MODULE_AUTHOR("Krzysztof Kozlowski <krzk@kernel.org>"); |
1e3e559f KK |
206 | MODULE_AUTHOR("Pankaj Dubey <pankaj.dubey@samsung.com>"); |
207 | MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>"); | |
208 | MODULE_LICENSE("GPL"); |