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 { 0xBB8D, "AM62AX" },
47 };
48
49 static int
k3_chipinfo_partno_to_names(unsigned int partno,struct soc_device_attribute * soc_dev_attr)50 k3_chipinfo_partno_to_names(unsigned int partno,
51 struct soc_device_attribute *soc_dev_attr)
52 {
53 int i;
54
55 for (i = 0; i < ARRAY_SIZE(k3_soc_ids); i++)
56 if (partno == k3_soc_ids[i].id) {
57 soc_dev_attr->family = k3_soc_ids[i].family_name;
58 return 0;
59 }
60
61 return -EINVAL;
62 }
63
k3_chipinfo_probe(struct platform_device * pdev)64 static int k3_chipinfo_probe(struct platform_device *pdev)
65 {
66 struct device_node *node = pdev->dev.of_node;
67 struct soc_device_attribute *soc_dev_attr;
68 struct device *dev = &pdev->dev;
69 struct soc_device *soc_dev;
70 struct regmap *regmap;
71 u32 partno_id;
72 u32 variant;
73 u32 jtag_id;
74 u32 mfg;
75 int ret;
76
77 regmap = device_node_to_regmap(node);
78 if (IS_ERR(regmap))
79 return PTR_ERR(regmap);
80
81 ret = regmap_read(regmap, CTRLMMR_WKUP_JTAGID_REG, &jtag_id);
82 if (ret < 0)
83 return ret;
84
85 mfg = (jtag_id & CTRLMMR_WKUP_JTAGID_MFG_MASK) >>
86 CTRLMMR_WKUP_JTAGID_MFG_SHIFT;
87
88 if (mfg != CTRLMMR_WKUP_JTAGID_MFG_TI) {
89 dev_err(dev, "Invalid MFG SoC\n");
90 return -ENODEV;
91 }
92
93 variant = (jtag_id & CTRLMMR_WKUP_JTAGID_VARIANT_MASK) >>
94 CTRLMMR_WKUP_JTAGID_VARIANT_SHIFT;
95 variant++;
96
97 partno_id = (jtag_id & CTRLMMR_WKUP_JTAGID_PARTNO_MASK) >>
98 CTRLMMR_WKUP_JTAGID_PARTNO_SHIFT;
99
100 soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
101 if (!soc_dev_attr)
102 return -ENOMEM;
103
104 soc_dev_attr->revision = kasprintf(GFP_KERNEL, "SR%x.0", variant);
105 if (!soc_dev_attr->revision) {
106 ret = -ENOMEM;
107 goto err;
108 }
109
110 ret = k3_chipinfo_partno_to_names(partno_id, soc_dev_attr);
111 if (ret) {
112 dev_err(dev, "Unknown SoC JTAGID[0x%08X]\n", jtag_id);
113 ret = -ENODEV;
114 goto err_free_rev;
115 }
116
117 node = of_find_node_by_path("/");
118 of_property_read_string(node, "model", &soc_dev_attr->machine);
119 of_node_put(node);
120
121 soc_dev = soc_device_register(soc_dev_attr);
122 if (IS_ERR(soc_dev)) {
123 ret = PTR_ERR(soc_dev);
124 goto err_free_rev;
125 }
126
127 dev_info(dev, "Family:%s rev:%s JTAGID[0x%08x] Detected\n",
128 soc_dev_attr->family,
129 soc_dev_attr->revision, jtag_id);
130
131 return 0;
132
133 err_free_rev:
134 kfree(soc_dev_attr->revision);
135 err:
136 kfree(soc_dev_attr);
137 return ret;
138 }
139
140 static const struct of_device_id k3_chipinfo_of_match[] = {
141 { .compatible = "ti,am654-chipid", },
142 { /* sentinel */ },
143 };
144
145 static struct platform_driver k3_chipinfo_driver = {
146 .driver = {
147 .name = "k3-chipinfo",
148 .of_match_table = k3_chipinfo_of_match,
149 },
150 .probe = k3_chipinfo_probe,
151 };
152
k3_chipinfo_init(void)153 static int __init k3_chipinfo_init(void)
154 {
155 return platform_driver_register(&k3_chipinfo_driver);
156 }
157 subsys_initcall(k3_chipinfo_init);
158