1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * TI K3 SoC info driver
4 *
5 * Copyright (C) 2020 Texas Instruments Incorporated - http://www.ti.com
6 */
7
8 #include <linux/mfd/syscon.h>
9 #include <linux/of.h>
10 #include <linux/of_address.h>
11 #include <linux/regmap.h>
12 #include <linux/platform_device.h>
13 #include <linux/slab.h>
14 #include <linux/string.h>
15 #include <linux/sys_soc.h>
16
17 #define CTRLMMR_WKUP_JTAGID_REG 0
18 /*
19 * Bits:
20 * 31-28 VARIANT Device variant
21 * 27-12 PARTNO Part number
22 * 11-1 MFG Indicates TI as manufacturer (0x17)
23 * 1 Always 1
24 */
25 #define CTRLMMR_WKUP_JTAGID_VARIANT_SHIFT (28)
26 #define CTRLMMR_WKUP_JTAGID_VARIANT_MASK GENMASK(31, 28)
27
28 #define CTRLMMR_WKUP_JTAGID_PARTNO_SHIFT (12)
29 #define CTRLMMR_WKUP_JTAGID_PARTNO_MASK GENMASK(27, 12)
30
31 #define CTRLMMR_WKUP_JTAGID_MFG_SHIFT (1)
32 #define CTRLMMR_WKUP_JTAGID_MFG_MASK GENMASK(11, 1)
33
34 #define CTRLMMR_WKUP_JTAGID_MFG_TI 0x17
35
36 static const struct k3_soc_id {
37 unsigned int id;
38 const char *family_name;
39 } k3_soc_ids[] = {
40 { 0xBB5A, "AM65X" },
41 { 0xBB64, "J721E" },
42 { 0xBB6D, "J7200" },
43 };
44
45 static int
k3_chipinfo_partno_to_names(unsigned int partno,struct soc_device_attribute * soc_dev_attr)46 k3_chipinfo_partno_to_names(unsigned int partno,
47 struct soc_device_attribute *soc_dev_attr)
48 {
49 int i;
50
51 for (i = 0; i < ARRAY_SIZE(k3_soc_ids); i++)
52 if (partno == k3_soc_ids[i].id) {
53 soc_dev_attr->family = k3_soc_ids[i].family_name;
54 return 0;
55 }
56
57 return -EINVAL;
58 }
59
k3_chipinfo_probe(struct platform_device * pdev)60 static int k3_chipinfo_probe(struct platform_device *pdev)
61 {
62 struct device_node *node = pdev->dev.of_node;
63 struct soc_device_attribute *soc_dev_attr;
64 struct device *dev = &pdev->dev;
65 struct soc_device *soc_dev;
66 struct regmap *regmap;
67 u32 partno_id;
68 u32 variant;
69 u32 jtag_id;
70 u32 mfg;
71 int ret;
72
73 regmap = device_node_to_regmap(node);
74 if (IS_ERR(regmap))
75 return PTR_ERR(regmap);
76
77 ret = regmap_read(regmap, CTRLMMR_WKUP_JTAGID_REG, &jtag_id);
78 if (ret < 0)
79 return ret;
80
81 mfg = (jtag_id & CTRLMMR_WKUP_JTAGID_MFG_MASK) >>
82 CTRLMMR_WKUP_JTAGID_MFG_SHIFT;
83
84 if (mfg != CTRLMMR_WKUP_JTAGID_MFG_TI) {
85 dev_err(dev, "Invalid MFG SoC\n");
86 return -ENODEV;
87 }
88
89 variant = (jtag_id & CTRLMMR_WKUP_JTAGID_VARIANT_MASK) >>
90 CTRLMMR_WKUP_JTAGID_VARIANT_SHIFT;
91 variant++;
92
93 partno_id = (jtag_id & CTRLMMR_WKUP_JTAGID_PARTNO_MASK) >>
94 CTRLMMR_WKUP_JTAGID_PARTNO_SHIFT;
95
96 soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
97 if (!soc_dev_attr)
98 return -ENOMEM;
99
100 soc_dev_attr->revision = kasprintf(GFP_KERNEL, "SR%x.0", variant);
101 if (!soc_dev_attr->revision) {
102 ret = -ENOMEM;
103 goto err;
104 }
105
106 ret = k3_chipinfo_partno_to_names(partno_id, soc_dev_attr);
107 if (ret) {
108 dev_err(dev, "Unknown SoC JTAGID[0x%08X]\n", jtag_id);
109 ret = -ENODEV;
110 goto err_free_rev;
111 }
112
113 node = of_find_node_by_path("/");
114 of_property_read_string(node, "model", &soc_dev_attr->machine);
115 of_node_put(node);
116
117 soc_dev = soc_device_register(soc_dev_attr);
118 if (IS_ERR(soc_dev)) {
119 ret = PTR_ERR(soc_dev);
120 goto err_free_rev;
121 }
122
123 dev_info(dev, "Family:%s rev:%s JTAGID[0x%08x] Detected\n",
124 soc_dev_attr->family,
125 soc_dev_attr->revision, jtag_id);
126
127 return 0;
128
129 err_free_rev:
130 kfree(soc_dev_attr->revision);
131 err:
132 kfree(soc_dev_attr);
133 return ret;
134 }
135
136 static const struct of_device_id k3_chipinfo_of_match[] = {
137 { .compatible = "ti,am654-chipid", },
138 { /* sentinel */ },
139 };
140
141 static struct platform_driver k3_chipinfo_driver = {
142 .driver = {
143 .name = "k3-chipinfo",
144 .of_match_table = k3_chipinfo_of_match,
145 },
146 .probe = k3_chipinfo_probe,
147 };
148
k3_chipinfo_init(void)149 static int __init k3_chipinfo_init(void)
150 {
151 return platform_driver_register(&k3_chipinfo_driver);
152 }
153 subsys_initcall(k3_chipinfo_init);
154