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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> |
3253b7b7 | 18 | #include <linux/of.h> |
352bfbb3 | 19 | #include <linux/platform_device.h> |
40d8aff6 | 20 | #include <linux/regmap.h> |
3253b7b7 | 21 | #include <linux/slab.h> |
40d8aff6 | 22 | #include <linux/soc/samsung/exynos-chipid.h> |
3253b7b7 PD |
23 | #include <linux/sys_soc.h> |
24 | ||
352bfbb3 KK |
25 | #include "exynos-asv.h" |
26 | ||
3253b7b7 PD |
27 | static const struct exynos_soc_id { |
28 | const char *name; | |
29 | unsigned int id; | |
30 | } soc_ids[] = { | |
7136d6a9 | 31 | /* List ordered by SoC name */ |
3253b7b7 PD |
32 | { "EXYNOS3250", 0xE3472000 }, |
33 | { "EXYNOS4210", 0x43200000 }, /* EVT0 revision */ | |
34 | { "EXYNOS4210", 0x43210000 }, | |
35 | { "EXYNOS4212", 0x43220000 }, | |
36 | { "EXYNOS4412", 0xE4412000 }, | |
37 | { "EXYNOS5250", 0x43520000 }, | |
38 | { "EXYNOS5260", 0xE5260000 }, | |
39 | { "EXYNOS5410", 0xE5410000 }, | |
40 | { "EXYNOS5420", 0xE5420000 }, | |
7136d6a9 | 41 | { "EXYNOS5433", 0xE5433000 }, |
3253b7b7 PD |
42 | { "EXYNOS5440", 0xE5440000 }, |
43 | { "EXYNOS5800", 0xE5422000 }, | |
44 | { "EXYNOS7420", 0xE7420000 }, | |
3253b7b7 PD |
45 | }; |
46 | ||
6166174a | 47 | static const char *product_id_to_soc_id(unsigned int product_id) |
3253b7b7 PD |
48 | { |
49 | int i; | |
50 | ||
51 | for (i = 0; i < ARRAY_SIZE(soc_ids); i++) | |
52 | if ((product_id & EXYNOS_MASK) == soc_ids[i].id) | |
53 | return soc_ids[i].name; | |
54 | return NULL; | |
55 | } | |
56 | ||
352bfbb3 | 57 | static int exynos_chipid_probe(struct platform_device *pdev) |
3253b7b7 PD |
58 | { |
59 | struct soc_device_attribute *soc_dev_attr; | |
3253b7b7 PD |
60 | struct soc_device *soc_dev; |
61 | struct device_node *root; | |
40d8aff6 | 62 | struct regmap *regmap; |
3253b7b7 PD |
63 | u32 product_id; |
64 | u32 revision; | |
40d8aff6 | 65 | int ret; |
3253b7b7 | 66 | |
352bfbb3 | 67 | regmap = device_node_to_regmap(pdev->dev.of_node); |
82303457 | 68 | if (IS_ERR(regmap)) |
40d8aff6 | 69 | return PTR_ERR(regmap); |
3253b7b7 | 70 | |
40d8aff6 SN |
71 | ret = regmap_read(regmap, EXYNOS_CHIPID_REG_PRO_ID, &product_id); |
72 | if (ret < 0) | |
73 | return ret; | |
74 | ||
3253b7b7 | 75 | revision = product_id & EXYNOS_REV_MASK; |
3253b7b7 | 76 | |
352bfbb3 KK |
77 | soc_dev_attr = devm_kzalloc(&pdev->dev, sizeof(*soc_dev_attr), |
78 | GFP_KERNEL); | |
3253b7b7 PD |
79 | if (!soc_dev_attr) |
80 | return -ENOMEM; | |
81 | ||
82 | soc_dev_attr->family = "Samsung Exynos"; | |
83 | ||
84 | root = of_find_node_by_path("/"); | |
85 | of_property_read_string(root, "model", &soc_dev_attr->machine); | |
86 | of_node_put(root); | |
87 | ||
352bfbb3 KK |
88 | soc_dev_attr->revision = devm_kasprintf(&pdev->dev, GFP_KERNEL, |
89 | "%x", revision); | |
3253b7b7 PD |
90 | soc_dev_attr->soc_id = product_id_to_soc_id(product_id); |
91 | if (!soc_dev_attr->soc_id) { | |
92 | pr_err("Unknown SoC\n"); | |
352bfbb3 | 93 | return -ENODEV; |
3253b7b7 PD |
94 | } |
95 | ||
96 | /* please note that the actual registration will be deferred */ | |
97 | soc_dev = soc_device_register(soc_dev_attr); | |
352bfbb3 KK |
98 | if (IS_ERR(soc_dev)) |
99 | return PTR_ERR(soc_dev); | |
100 | ||
101 | ret = exynos_asv_init(&pdev->dev, regmap); | |
102 | if (ret) | |
3636e821 | 103 | goto err; |
352bfbb3 KK |
104 | |
105 | platform_set_drvdata(pdev, soc_dev); | |
3253b7b7 | 106 | |
3b4c362e KK |
107 | dev_info(soc_device_to_device(soc_dev), |
108 | "Exynos: CPU[%s] PRO_ID[0x%x] REV[0x%x] Detected\n", | |
109 | soc_dev_attr->soc_id, product_id, revision); | |
3253b7b7 PD |
110 | |
111 | return 0; | |
3636e821 CIK |
112 | |
113 | err: | |
352bfbb3 KK |
114 | soc_device_unregister(soc_dev); |
115 | ||
3636e821 | 116 | return ret; |
3253b7b7 | 117 | } |
3636e821 | 118 | |
352bfbb3 KK |
119 | static int exynos_chipid_remove(struct platform_device *pdev) |
120 | { | |
121 | struct soc_device *soc_dev = platform_get_drvdata(pdev); | |
122 | ||
123 | soc_device_unregister(soc_dev); | |
124 | ||
125 | return 0; | |
126 | } | |
127 | ||
128 | static const struct of_device_id exynos_chipid_of_device_ids[] = { | |
129 | { .compatible = "samsung,exynos4210-chipid" }, | |
130 | {} | |
131 | }; | |
132 | ||
133 | static struct platform_driver exynos_chipid_driver = { | |
134 | .driver = { | |
135 | .name = "exynos-chipid", | |
136 | .of_match_table = exynos_chipid_of_device_ids, | |
137 | }, | |
138 | .probe = exynos_chipid_probe, | |
139 | .remove = exynos_chipid_remove, | |
140 | }; | |
141 | builtin_platform_driver(exynos_chipid_driver); |