tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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};
45
46static int
47k3_chipinfo_partno_to_names(unsigned int partno,
48 struct soc_device_attribute *soc_dev_attr)
49{
50 int i;
51
52 for (i = 0; i < ARRAY_SIZE(k3_soc_ids); i++)
53 if (partno == k3_soc_ids[i].id) {
54 soc_dev_attr->family = k3_soc_ids[i].family_name;
55 return 0;
56 }
57
58 return -EINVAL;
59}
60
61static int k3_chipinfo_probe(struct platform_device *pdev)
62{
63 struct device_node *node = pdev->dev.of_node;
64 struct soc_device_attribute *soc_dev_attr;
65 struct device *dev = &pdev->dev;
66 struct soc_device *soc_dev;
67 struct regmap *regmap;
68 u32 partno_id;
69 u32 variant;
70 u32 jtag_id;
71 u32 mfg;
72 int ret;
73
74 regmap = device_node_to_regmap(node);
75 if (IS_ERR(regmap))
76 return PTR_ERR(regmap);
77
78 ret = regmap_read(regmap, CTRLMMR_WKUP_JTAGID_REG, &jtag_id);
79 if (ret < 0)
80 return ret;
81
82 mfg = (jtag_id & CTRLMMR_WKUP_JTAGID_MFG_MASK) >>
83 CTRLMMR_WKUP_JTAGID_MFG_SHIFT;
84
85 if (mfg != CTRLMMR_WKUP_JTAGID_MFG_TI) {
86 dev_err(dev, "Invalid MFG SoC\n");
87 return -ENODEV;
88 }
89
90 variant = (jtag_id & CTRLMMR_WKUP_JTAGID_VARIANT_MASK) >>
91 CTRLMMR_WKUP_JTAGID_VARIANT_SHIFT;
92 variant++;
93
94 partno_id = (jtag_id & CTRLMMR_WKUP_JTAGID_PARTNO_MASK) >>
95 CTRLMMR_WKUP_JTAGID_PARTNO_SHIFT;
96
97 soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
98 if (!soc_dev_attr)
99 return -ENOMEM;
100
101 soc_dev_attr->revision = kasprintf(GFP_KERNEL, "SR%x.0", variant);
102 if (!soc_dev_attr->revision) {
103 ret = -ENOMEM;
104 goto err;
105 }
106
107 ret = k3_chipinfo_partno_to_names(partno_id, soc_dev_attr);
108 if (ret) {
109 dev_err(dev, "Unknown SoC JTAGID[0x%08X]\n", jtag_id);
110 ret = -ENODEV;
111 goto err_free_rev;
112 }
113
114 node = of_find_node_by_path("/");
115 of_property_read_string(node, "model", &soc_dev_attr->machine);
116 of_node_put(node);
117
118 soc_dev = soc_device_register(soc_dev_attr);
119 if (IS_ERR(soc_dev)) {
120 ret = PTR_ERR(soc_dev);
121 goto err_free_rev;
122 }
123
124 dev_info(dev, "Family:%s rev:%s JTAGID[0x%08x] Detected\n",
125 soc_dev_attr->family,
126 soc_dev_attr->revision, jtag_id);
127
128 return 0;
129
130err_free_rev:
131 kfree(soc_dev_attr->revision);
132err:
133 kfree(soc_dev_attr);
134 return ret;
135}
136
137static const struct of_device_id k3_chipinfo_of_match[] = {
138 { .compatible = "ti,am654-chipid", },
139 { /* sentinel */ },
140};
141
142static struct platform_driver k3_chipinfo_driver = {
143 .driver = {
144 .name = "k3-chipinfo",
145 .of_match_table = k3_chipinfo_of_match,
146 },
147 .probe = k3_chipinfo_probe,
148};
149
150static int __init k3_chipinfo_init(void)
151{
152 return platform_driver_register(&k3_chipinfo_driver);
153}
154subsys_initcall(k3_chipinfo_init);