xref: /openbmc/linux/drivers/soc/ti/k3-socinfo.c (revision 443012dd)
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