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 { 0xBB38, "AM64X" },
44 { 0xBB75, "J721S2"},
45 { 0xBB7E, "AM62X" },
46 };
47
48 static int
k3_chipinfo_partno_to_names(unsigned int partno,struct soc_device_attribute * soc_dev_attr)49 k3_chipinfo_partno_to_names(unsigned int partno,
50 struct soc_device_attribute *soc_dev_attr)
51 {
52 int i;
53
54 for (i = 0; i < ARRAY_SIZE(k3_soc_ids); i++)
55 if (partno == k3_soc_ids[i].id) {
56 soc_dev_attr->family = k3_soc_ids[i].family_name;
57 return 0;
58 }
59
60 return -EINVAL;
61 }
62
k3_chipinfo_probe(struct platform_device * pdev)63 static int k3_chipinfo_probe(struct platform_device *pdev)
64 {
65 struct device_node *node = pdev->dev.of_node;
66 struct soc_device_attribute *soc_dev_attr;
67 struct device *dev = &pdev->dev;
68 struct soc_device *soc_dev;
69 struct regmap *regmap;
70 u32 partno_id;
71 u32 variant;
72 u32 jtag_id;
73 u32 mfg;
74 int ret;
75
76 regmap = device_node_to_regmap(node);
77 if (IS_ERR(regmap))
78 return PTR_ERR(regmap);
79
80 ret = regmap_read(regmap, CTRLMMR_WKUP_JTAGID_REG, &jtag_id);
81 if (ret < 0)
82 return ret;
83
84 mfg = (jtag_id & CTRLMMR_WKUP_JTAGID_MFG_MASK) >>
85 CTRLMMR_WKUP_JTAGID_MFG_SHIFT;
86
87 if (mfg != CTRLMMR_WKUP_JTAGID_MFG_TI) {
88 dev_err(dev, "Invalid MFG SoC\n");
89 return -ENODEV;
90 }
91
92 variant = (jtag_id & CTRLMMR_WKUP_JTAGID_VARIANT_MASK) >>
93 CTRLMMR_WKUP_JTAGID_VARIANT_SHIFT;
94 variant++;
95
96 partno_id = (jtag_id & CTRLMMR_WKUP_JTAGID_PARTNO_MASK) >>
97 CTRLMMR_WKUP_JTAGID_PARTNO_SHIFT;
98
99 soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
100 if (!soc_dev_attr)
101 return -ENOMEM;
102
103 soc_dev_attr->revision = kasprintf(GFP_KERNEL, "SR%x.0", variant);
104 if (!soc_dev_attr->revision) {
105 ret = -ENOMEM;
106 goto err;
107 }
108
109 ret = k3_chipinfo_partno_to_names(partno_id, soc_dev_attr);
110 if (ret) {
111 dev_err(dev, "Unknown SoC JTAGID[0x%08X]\n", jtag_id);
112 ret = -ENODEV;
113 goto err_free_rev;
114 }
115
116 node = of_find_node_by_path("/");
117 of_property_read_string(node, "model", &soc_dev_attr->machine);
118 of_node_put(node);
119
120 soc_dev = soc_device_register(soc_dev_attr);
121 if (IS_ERR(soc_dev)) {
122 ret = PTR_ERR(soc_dev);
123 goto err_free_rev;
124 }
125
126 dev_info(dev, "Family:%s rev:%s JTAGID[0x%08x] Detected\n",
127 soc_dev_attr->family,
128 soc_dev_attr->revision, jtag_id);
129
130 return 0;
131
132 err_free_rev:
133 kfree(soc_dev_attr->revision);
134 err:
135 kfree(soc_dev_attr);
136 return ret;
137 }
138
139 static const struct of_device_id k3_chipinfo_of_match[] = {
140 { .compatible = "ti,am654-chipid", },
141 { /* sentinel */ },
142 };
143
144 static struct platform_driver k3_chipinfo_driver = {
145 .driver = {
146 .name = "k3-chipinfo",
147 .of_match_table = k3_chipinfo_of_match,
148 },
149 .probe = k3_chipinfo_probe,
150 };
151
k3_chipinfo_init(void)152 static int __init k3_chipinfo_init(void)
153 {
154 return platform_driver_register(&k3_chipinfo_driver);
155 }
156 subsys_initcall(k3_chipinfo_init);
157
