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 { 0xBB75, "J721S2"},
45};
46
47static int
48k3_chipinfo_partno_to_names(unsigned int partno,
49 struct soc_device_attribute *soc_dev_attr)
50{
51 int i;
52
53 for (i = 0; i < ARRAY_SIZE(k3_soc_ids); i++)
54 if (partno == k3_soc_ids[i].id) {
55 soc_dev_attr->family = k3_soc_ids[i].family_name;
56 return 0;
57 }
58
59 return -EINVAL;
60}
61
62static int k3_chipinfo_probe(struct platform_device *pdev)
63{
64 struct device_node *node = pdev->dev.of_node;
65 struct soc_device_attribute *soc_dev_attr;
66 struct device *dev = &pdev->dev;
67 struct soc_device *soc_dev;
68 struct regmap *regmap;
69 u32 partno_id;
70 u32 variant;
71 u32 jtag_id;
72 u32 mfg;
73 int ret;
74
75 regmap = device_node_to_regmap(node);
76 if (IS_ERR(regmap))
77 return PTR_ERR(regmap);
78
79 ret = regmap_read(regmap, CTRLMMR_WKUP_JTAGID_REG, &jtag_id);
80 if (ret < 0)
81 return ret;
82
83 mfg = (jtag_id & CTRLMMR_WKUP_JTAGID_MFG_MASK) >>
84 CTRLMMR_WKUP_JTAGID_MFG_SHIFT;
85
86 if (mfg != CTRLMMR_WKUP_JTAGID_MFG_TI) {
87 dev_err(dev, "Invalid MFG SoC\n");
88 return -ENODEV;
89 }
90
91 variant = (jtag_id & CTRLMMR_WKUP_JTAGID_VARIANT_MASK) >>
92 CTRLMMR_WKUP_JTAGID_VARIANT_SHIFT;
93 variant++;
94
95 partno_id = (jtag_id & CTRLMMR_WKUP_JTAGID_PARTNO_MASK) >>
96 CTRLMMR_WKUP_JTAGID_PARTNO_SHIFT;
97
98 soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
99 if (!soc_dev_attr)
100 return -ENOMEM;
101
102 soc_dev_attr->revision = kasprintf(GFP_KERNEL, "SR%x.0", variant);
103 if (!soc_dev_attr->revision) {
104 ret = -ENOMEM;
105 goto err;
106 }
107
108 ret = k3_chipinfo_partno_to_names(partno_id, soc_dev_attr);
109 if (ret) {
110 dev_err(dev, "Unknown SoC JTAGID[0x%08X]\n", jtag_id);
111 ret = -ENODEV;
112 goto err_free_rev;
113 }
114
115 node = of_find_node_by_path("/");
116 of_property_read_string(node, "model", &soc_dev_attr->machine);
117 of_node_put(node);
118
119 soc_dev = soc_device_register(soc_dev_attr);
120 if (IS_ERR(soc_dev)) {
121 ret = PTR_ERR(soc_dev);
122 goto err_free_rev;
123 }
124
125 dev_info(dev, "Family:%s rev:%s JTAGID[0x%08x] Detected\n",
126 soc_dev_attr->family,
127 soc_dev_attr->revision, jtag_id);
128
129 return 0;
130
131err_free_rev:
132 kfree(soc_dev_attr->revision);
133err:
134 kfree(soc_dev_attr);
135 return ret;
136}
137
138static const struct of_device_id k3_chipinfo_of_match[] = {
139 { .compatible = "ti,am654-chipid", },
140 { /* sentinel */ },
141};
142
143static struct platform_driver k3_chipinfo_driver = {
144 .driver = {
145 .name = "k3-chipinfo",
146 .of_match_table = k3_chipinfo_of_match,
147 },
148 .probe = k3_chipinfo_probe,
149};
150
151static int __init k3_chipinfo_init(void)
152{
153 return platform_driver_register(&k3_chipinfo_driver);
154}
155subsys_initcall(k3_chipinfo_init);