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
36static 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
51static int
52k3_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
66static 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
135err_free_rev:
136	kfree(soc_dev_attr->revision);
137err:
138	kfree(soc_dev_attr);
139	return ret;
140}
141
142static const struct of_device_id k3_chipinfo_of_match[] = {
143	{ .compatible = "ti,am654-chipid", },
144	{ /* sentinel */ },
145};
146
147static 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
155static int __init k3_chipinfo_init(void)
156{
157	return platform_driver_register(&k3_chipinfo_driver);
158}
159subsys_initcall(k3_chipinfo_init);
160