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 { 0xBB80, "J784S4" },
47 { 0xBB8D, "AM62AX" },
48 { 0xBB9D, "AM62PX" },
49 };
50
51 static int
k3_chipinfo_partno_to_names(unsigned int partno,struct soc_device_attribute * soc_dev_attr)52 k3_chipinfo_partno_to_names(unsigned int partno,
53 struct soc_device_attribute *soc_dev_attr)
54 {
55 int i;
56
57 for (i = 0; i < ARRAY_SIZE(k3_soc_ids); i++)
58 if (partno == k3_soc_ids[i].id) {
59 soc_dev_attr->family = k3_soc_ids[i].family_name;
60 return 0;
61 }
62
63 return -EINVAL;
64 }
65
k3_chipinfo_probe(struct platform_device * pdev)66 static int k3_chipinfo_probe(struct platform_device *pdev)
67 {
68 struct device_node *node = pdev->dev.of_node;
69 struct soc_device_attribute *soc_dev_attr;
70 struct device *dev = &pdev->dev;
71 struct soc_device *soc_dev;
72 struct regmap *regmap;
73 u32 partno_id;
74 u32 variant;
75 u32 jtag_id;
76 u32 mfg;
77 int ret;
78
79 regmap = device_node_to_regmap(node);
80 if (IS_ERR(regmap))
81 return PTR_ERR(regmap);
82
83 ret = regmap_read(regmap, CTRLMMR_WKUP_JTAGID_REG, &jtag_id);
84 if (ret < 0)
85 return ret;
86
87 mfg = (jtag_id & CTRLMMR_WKUP_JTAGID_MFG_MASK) >>
88 CTRLMMR_WKUP_JTAGID_MFG_SHIFT;
89
90 if (mfg != CTRLMMR_WKUP_JTAGID_MFG_TI) {
91 dev_err(dev, "Invalid MFG SoC\n");
92 return -ENODEV;
93 }
94
95 variant = (jtag_id & CTRLMMR_WKUP_JTAGID_VARIANT_MASK) >>
96 CTRLMMR_WKUP_JTAGID_VARIANT_SHIFT;
97 variant++;
98
99 partno_id = (jtag_id & CTRLMMR_WKUP_JTAGID_PARTNO_MASK) >>
100 CTRLMMR_WKUP_JTAGID_PARTNO_SHIFT;
101
102 soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
103 if (!soc_dev_attr)
104 return -ENOMEM;
105
106 soc_dev_attr->revision = kasprintf(GFP_KERNEL, "SR%x.0", variant);
107 if (!soc_dev_attr->revision) {
108 ret = -ENOMEM;
109 goto err;
110 }
111
112 ret = k3_chipinfo_partno_to_names(partno_id, soc_dev_attr);
113 if (ret) {
114 dev_err(dev, "Unknown SoC JTAGID[0x%08X]\n", jtag_id);
115 ret = -ENODEV;
116 goto err_free_rev;
117 }
118
119 node = of_find_node_by_path("/");
120 of_property_read_string(node, "model", &soc_dev_attr->machine);
121 of_node_put(node);
122
123 soc_dev = soc_device_register(soc_dev_attr);
124 if (IS_ERR(soc_dev)) {
125 ret = PTR_ERR(soc_dev);
126 goto err_free_rev;
127 }
128
129 dev_info(dev, "Family:%s rev:%s JTAGID[0x%08x] Detected\n",
130 soc_dev_attr->family,
131 soc_dev_attr->revision, jtag_id);
132
133 return 0;
134
135 err_free_rev:
136 kfree(soc_dev_attr->revision);
137 err:
138 kfree(soc_dev_attr);
139 return ret;
140 }
141
142 static const struct of_device_id k3_chipinfo_of_match[] = {
143 { .compatible = "ti,am654-chipid", },
144 { /* sentinel */ },
145 };
146
147 static struct platform_driver k3_chipinfo_driver = {
148 .driver = {
149 .name = "k3-chipinfo",
150 .of_match_table = k3_chipinfo_of_match,
151 },
152 .probe = k3_chipinfo_probe,
153 };
154
k3_chipinfo_init(void)155 static int __init k3_chipinfo_init(void)
156 {
157 return platform_driver_register(&k3_chipinfo_driver);
158 }
159 subsys_initcall(k3_chipinfo_init);
160