1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Copyright (c) 2019 Samsung Electronics Co., Ltd.
4*4882a593Smuzhiyun * http://www.samsung.com/
5*4882a593Smuzhiyun *
6*4882a593Smuzhiyun * Exynos - CHIP ID support
7*4882a593Smuzhiyun * Author: Pankaj Dubey <pankaj.dubey@samsung.com>
8*4882a593Smuzhiyun * Author: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
9*4882a593Smuzhiyun */
10*4882a593Smuzhiyun
11*4882a593Smuzhiyun #include <linux/io.h>
12*4882a593Smuzhiyun #include <linux/mfd/syscon.h>
13*4882a593Smuzhiyun #include <linux/of.h>
14*4882a593Smuzhiyun #include <linux/regmap.h>
15*4882a593Smuzhiyun #include <linux/slab.h>
16*4882a593Smuzhiyun #include <linux/soc/samsung/exynos-chipid.h>
17*4882a593Smuzhiyun #include <linux/sys_soc.h>
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun static const struct exynos_soc_id {
20*4882a593Smuzhiyun const char *name;
21*4882a593Smuzhiyun unsigned int id;
22*4882a593Smuzhiyun } soc_ids[] = {
23*4882a593Smuzhiyun { "EXYNOS3250", 0xE3472000 },
24*4882a593Smuzhiyun { "EXYNOS4210", 0x43200000 }, /* EVT0 revision */
25*4882a593Smuzhiyun { "EXYNOS4210", 0x43210000 },
26*4882a593Smuzhiyun { "EXYNOS4212", 0x43220000 },
27*4882a593Smuzhiyun { "EXYNOS4412", 0xE4412000 },
28*4882a593Smuzhiyun { "EXYNOS5250", 0x43520000 },
29*4882a593Smuzhiyun { "EXYNOS5260", 0xE5260000 },
30*4882a593Smuzhiyun { "EXYNOS5410", 0xE5410000 },
31*4882a593Smuzhiyun { "EXYNOS5420", 0xE5420000 },
32*4882a593Smuzhiyun { "EXYNOS5440", 0xE5440000 },
33*4882a593Smuzhiyun { "EXYNOS5800", 0xE5422000 },
34*4882a593Smuzhiyun { "EXYNOS7420", 0xE7420000 },
35*4882a593Smuzhiyun { "EXYNOS5433", 0xE5433000 },
36*4882a593Smuzhiyun };
37*4882a593Smuzhiyun
product_id_to_soc_id(unsigned int product_id)38*4882a593Smuzhiyun static const char * __init product_id_to_soc_id(unsigned int product_id)
39*4882a593Smuzhiyun {
40*4882a593Smuzhiyun int i;
41*4882a593Smuzhiyun
42*4882a593Smuzhiyun for (i = 0; i < ARRAY_SIZE(soc_ids); i++)
43*4882a593Smuzhiyun if ((product_id & EXYNOS_MASK) == soc_ids[i].id)
44*4882a593Smuzhiyun return soc_ids[i].name;
45*4882a593Smuzhiyun return NULL;
46*4882a593Smuzhiyun }
47*4882a593Smuzhiyun
exynos_chipid_early_init(void)48*4882a593Smuzhiyun static int __init exynos_chipid_early_init(void)
49*4882a593Smuzhiyun {
50*4882a593Smuzhiyun struct soc_device_attribute *soc_dev_attr;
51*4882a593Smuzhiyun struct soc_device *soc_dev;
52*4882a593Smuzhiyun struct device_node *root;
53*4882a593Smuzhiyun struct device_node *syscon;
54*4882a593Smuzhiyun struct regmap *regmap;
55*4882a593Smuzhiyun u32 product_id;
56*4882a593Smuzhiyun u32 revision;
57*4882a593Smuzhiyun int ret;
58*4882a593Smuzhiyun
59*4882a593Smuzhiyun syscon = of_find_compatible_node(NULL, NULL,
60*4882a593Smuzhiyun "samsung,exynos4210-chipid");
61*4882a593Smuzhiyun if (!syscon)
62*4882a593Smuzhiyun return -ENODEV;
63*4882a593Smuzhiyun
64*4882a593Smuzhiyun regmap = device_node_to_regmap(syscon);
65*4882a593Smuzhiyun of_node_put(syscon);
66*4882a593Smuzhiyun
67*4882a593Smuzhiyun if (IS_ERR(regmap))
68*4882a593Smuzhiyun return PTR_ERR(regmap);
69*4882a593Smuzhiyun
70*4882a593Smuzhiyun ret = regmap_read(regmap, EXYNOS_CHIPID_REG_PRO_ID, &product_id);
71*4882a593Smuzhiyun if (ret < 0)
72*4882a593Smuzhiyun return ret;
73*4882a593Smuzhiyun
74*4882a593Smuzhiyun revision = product_id & EXYNOS_REV_MASK;
75*4882a593Smuzhiyun
76*4882a593Smuzhiyun soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
77*4882a593Smuzhiyun if (!soc_dev_attr)
78*4882a593Smuzhiyun return -ENOMEM;
79*4882a593Smuzhiyun
80*4882a593Smuzhiyun soc_dev_attr->family = "Samsung Exynos";
81*4882a593Smuzhiyun
82*4882a593Smuzhiyun root = of_find_node_by_path("/");
83*4882a593Smuzhiyun of_property_read_string(root, "model", &soc_dev_attr->machine);
84*4882a593Smuzhiyun of_node_put(root);
85*4882a593Smuzhiyun
86*4882a593Smuzhiyun soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%x", revision);
87*4882a593Smuzhiyun soc_dev_attr->soc_id = product_id_to_soc_id(product_id);
88*4882a593Smuzhiyun if (!soc_dev_attr->soc_id) {
89*4882a593Smuzhiyun pr_err("Unknown SoC\n");
90*4882a593Smuzhiyun ret = -ENODEV;
91*4882a593Smuzhiyun goto err;
92*4882a593Smuzhiyun }
93*4882a593Smuzhiyun
94*4882a593Smuzhiyun /* please note that the actual registration will be deferred */
95*4882a593Smuzhiyun soc_dev = soc_device_register(soc_dev_attr);
96*4882a593Smuzhiyun if (IS_ERR(soc_dev)) {
97*4882a593Smuzhiyun ret = PTR_ERR(soc_dev);
98*4882a593Smuzhiyun goto err;
99*4882a593Smuzhiyun }
100*4882a593Smuzhiyun
101*4882a593Smuzhiyun /* it is too early to use dev_info() here (soc_dev is NULL) */
102*4882a593Smuzhiyun pr_info("soc soc0: Exynos: CPU[%s] PRO_ID[0x%x] REV[0x%x] Detected\n",
103*4882a593Smuzhiyun soc_dev_attr->soc_id, product_id, revision);
104*4882a593Smuzhiyun
105*4882a593Smuzhiyun return 0;
106*4882a593Smuzhiyun
107*4882a593Smuzhiyun err:
108*4882a593Smuzhiyun kfree(soc_dev_attr->revision);
109*4882a593Smuzhiyun kfree(soc_dev_attr);
110*4882a593Smuzhiyun return ret;
111*4882a593Smuzhiyun }
112*4882a593Smuzhiyun
113*4882a593Smuzhiyun early_initcall(exynos_chipid_early_init);
114