1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (c) 2019 Samsung Electronics Co., Ltd.
4 * http://www.samsung.com/
5 *
6 * EXYNOS - CHIP ID support
7 * Author: Pankaj Dubey <pankaj.dubey@samsung.com>
8 * Author: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
9 */
10
11 #include <linux/io.h>
12 #include <linux/mfd/syscon.h>
13 #include <linux/of.h>
14 #include <linux/regmap.h>
15 #include <linux/slab.h>
16 #include <linux/soc/samsung/exynos-chipid.h>
17 #include <linux/sys_soc.h>
18
19 static const struct exynos_soc_id {
20 const char *name;
21 unsigned int id;
22 } soc_ids[] = {
23 { "EXYNOS3250", 0xE3472000 },
24 { "EXYNOS4210", 0x43200000 }, /* EVT0 revision */
25 { "EXYNOS4210", 0x43210000 },
26 { "EXYNOS4212", 0x43220000 },
27 { "EXYNOS4412", 0xE4412000 },
28 { "EXYNOS5250", 0x43520000 },
29 { "EXYNOS5260", 0xE5260000 },
30 { "EXYNOS5410", 0xE5410000 },
31 { "EXYNOS5420", 0xE5420000 },
32 { "EXYNOS5440", 0xE5440000 },
33 { "EXYNOS5800", 0xE5422000 },
34 { "EXYNOS7420", 0xE7420000 },
35 { "EXYNOS5433", 0xE5433000 },
36 };
37
product_id_to_soc_id(unsigned int product_id)38 static const char * __init product_id_to_soc_id(unsigned int product_id)
39 {
40 int i;
41
42 for (i = 0; i < ARRAY_SIZE(soc_ids); i++)
43 if ((product_id & EXYNOS_MASK) == soc_ids[i].id)
44 return soc_ids[i].name;
45 return NULL;
46 }
47
exynos_chipid_early_init(void)48 int __init exynos_chipid_early_init(void)
49 {
50 struct soc_device_attribute *soc_dev_attr;
51 struct soc_device *soc_dev;
52 struct device_node *root;
53 struct regmap *regmap;
54 u32 product_id;
55 u32 revision;
56 int ret;
57
58 regmap = syscon_regmap_lookup_by_compatible("samsung,exynos4210-chipid");
59 if (IS_ERR(regmap))
60 return PTR_ERR(regmap);
61
62 ret = regmap_read(regmap, EXYNOS_CHIPID_REG_PRO_ID, &product_id);
63 if (ret < 0)
64 return ret;
65
66 revision = product_id & EXYNOS_REV_MASK;
67
68 soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
69 if (!soc_dev_attr)
70 return -ENOMEM;
71
72 soc_dev_attr->family = "Samsung Exynos";
73
74 root = of_find_node_by_path("/");
75 of_property_read_string(root, "model", &soc_dev_attr->machine);
76 of_node_put(root);
77
78 soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%x", revision);
79 soc_dev_attr->soc_id = product_id_to_soc_id(product_id);
80 if (!soc_dev_attr->soc_id) {
81 pr_err("Unknown SoC\n");
82 ret = -ENODEV;
83 goto err;
84 }
85
86 /* please note that the actual registration will be deferred */
87 soc_dev = soc_device_register(soc_dev_attr);
88 if (IS_ERR(soc_dev)) {
89 ret = PTR_ERR(soc_dev);
90 goto err;
91 }
92
93 /* it is too early to use dev_info() here (soc_dev is NULL) */
94 pr_info("soc soc0: Exynos: CPU[%s] PRO_ID[0x%x] REV[0x%x] Detected\n",
95 soc_dev_attr->soc_id, product_id, revision);
96
97 return 0;
98
99 err:
100 kfree(soc_dev_attr->revision);
101 kfree(soc_dev_attr);
102 return ret;
103 }
104
105 early_initcall(exynos_chipid_early_init);
106
