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
66 static const struct regmap_config k3_chipinfo_regmap_cfg = {
67 .reg_bits = 32,
68 .val_bits = 32,
69 .reg_stride = 4,
70 };
71
k3_chipinfo_probe(struct platform_device * pdev)72 static int k3_chipinfo_probe(struct platform_device *pdev)
73 {
74 struct device_node *node = pdev->dev.of_node;
75 struct soc_device_attribute *soc_dev_attr;
76 struct device *dev = &pdev->dev;
77 struct soc_device *soc_dev;
78 struct regmap *regmap;
79 void __iomem *base;
80 u32 partno_id;
81 u32 variant;
82 u32 jtag_id;
83 u32 mfg;
84 int ret;
85
86 base = devm_platform_ioremap_resource(pdev, 0);
87 if (IS_ERR(base))
88 return PTR_ERR(base);
89
90 regmap = regmap_init_mmio(dev, base, &k3_chipinfo_regmap_cfg);
91 if (IS_ERR(regmap))
92 return PTR_ERR(regmap);
93
94 ret = regmap_read(regmap, CTRLMMR_WKUP_JTAGID_REG, &jtag_id);
95 if (ret < 0)
96 return ret;
97
98 mfg = (jtag_id & CTRLMMR_WKUP_JTAGID_MFG_MASK) >>
99 CTRLMMR_WKUP_JTAGID_MFG_SHIFT;
100
101 if (mfg != CTRLMMR_WKUP_JTAGID_MFG_TI) {
102 dev_err(dev, "Invalid MFG SoC\n");
103 return -ENODEV;
104 }
105
106 variant = (jtag_id & CTRLMMR_WKUP_JTAGID_VARIANT_MASK) >>
107 CTRLMMR_WKUP_JTAGID_VARIANT_SHIFT;
108 variant++;
109
110 partno_id = (jtag_id & CTRLMMR_WKUP_JTAGID_PARTNO_MASK) >>
111 CTRLMMR_WKUP_JTAGID_PARTNO_SHIFT;
112
113 soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
114 if (!soc_dev_attr)
115 return -ENOMEM;
116
117 soc_dev_attr->revision = kasprintf(GFP_KERNEL, "SR%x.0", variant);
118 if (!soc_dev_attr->revision) {
119 ret = -ENOMEM;
120 goto err;
121 }
122
123 ret = k3_chipinfo_partno_to_names(partno_id, soc_dev_attr);
124 if (ret) {
125 dev_err(dev, "Unknown SoC JTAGID[0x%08X]\n", jtag_id);
126 ret = -ENODEV;
127 goto err_free_rev;
128 }
129
130 node = of_find_node_by_path("/");
131 of_property_read_string(node, "model", &soc_dev_attr->machine);
132 of_node_put(node);
133
134 soc_dev = soc_device_register(soc_dev_attr);
135 if (IS_ERR(soc_dev)) {
136 ret = PTR_ERR(soc_dev);
137 goto err_free_rev;
138 }
139
140 dev_info(dev, "Family:%s rev:%s JTAGID[0x%08x] Detected\n",
141 soc_dev_attr->family,
142 soc_dev_attr->revision, jtag_id);
143
144 return 0;
145
146 err_free_rev:
147 kfree(soc_dev_attr->revision);
148 err:
149 kfree(soc_dev_attr);
150 return ret;
151 }
152
153 static const struct of_device_id k3_chipinfo_of_match[] = {
154 { .compatible = "ti,am654-chipid", },
155 { /* sentinel */ },
156 };
157
158 static struct platform_driver k3_chipinfo_driver = {
159 .driver = {
160 .name = "k3-chipinfo",
161 .of_match_table = k3_chipinfo_of_match,
162 },
163 .probe = k3_chipinfo_probe,
164 };
165
k3_chipinfo_init(void)166 static int __init k3_chipinfo_init(void)
167 {
168 return platform_driver_register(&k3_chipinfo_driver);
169 }
170 subsys_initcall(k3_chipinfo_init);
171