1 // SPDX-License-Identifier: GPL-2.0
3 * TI K3 SoC info driver
5 * Copyright (C) 2020 Texas Instruments Incorporated - http://www.ti.com
8 #include <linux/mfd/syscon.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>
17 #define CTRLMMR_WKUP_JTAGID_REG 0
20 * 31-28 VARIANT Device variant
21 * 27-12 PARTNO Part number
22 * 11-1 MFG Indicates TI as manufacturer (0x17)
25 #define CTRLMMR_WKUP_JTAGID_VARIANT_SHIFT (28)
26 #define CTRLMMR_WKUP_JTAGID_VARIANT_MASK GENMASK(31, 28)
28 #define CTRLMMR_WKUP_JTAGID_PARTNO_SHIFT (12)
29 #define CTRLMMR_WKUP_JTAGID_PARTNO_MASK GENMASK(27, 12)
31 #define CTRLMMR_WKUP_JTAGID_MFG_SHIFT (1)
32 #define CTRLMMR_WKUP_JTAGID_MFG_MASK GENMASK(11, 1)
34 #define CTRLMMR_WKUP_JTAGID_MFG_TI 0x17
36 static const struct k3_soc_id {
38 const char *family_name;
52 k3_chipinfo_partno_to_names(unsigned int partno,
53 struct soc_device_attribute *soc_dev_attr)
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;
66 static int k3_chipinfo_probe(struct platform_device *pdev)
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;
79 regmap = device_node_to_regmap(node);
81 return PTR_ERR(regmap);
83 ret = regmap_read(regmap, CTRLMMR_WKUP_JTAGID_REG, &jtag_id);
87 mfg = (jtag_id & CTRLMMR_WKUP_JTAGID_MFG_MASK) >>
88 CTRLMMR_WKUP_JTAGID_MFG_SHIFT;
90 if (mfg != CTRLMMR_WKUP_JTAGID_MFG_TI) {
91 dev_err(dev, "Invalid MFG SoC\n");
95 variant = (jtag_id & CTRLMMR_WKUP_JTAGID_VARIANT_MASK) >>
96 CTRLMMR_WKUP_JTAGID_VARIANT_SHIFT;
99 partno_id = (jtag_id & CTRLMMR_WKUP_JTAGID_PARTNO_MASK) >>
100 CTRLMMR_WKUP_JTAGID_PARTNO_SHIFT;
102 soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
106 soc_dev_attr->revision = kasprintf(GFP_KERNEL, "SR%x.0", variant);
107 if (!soc_dev_attr->revision) {
112 ret = k3_chipinfo_partno_to_names(partno_id, soc_dev_attr);
114 dev_err(dev, "Unknown SoC JTAGID[0x%08X]: %d\n", jtag_id, ret);
118 node = of_find_node_by_path("/");
119 of_property_read_string(node, "model", &soc_dev_attr->machine);
122 soc_dev = soc_device_register(soc_dev_attr);
123 if (IS_ERR(soc_dev)) {
124 ret = PTR_ERR(soc_dev);
128 dev_info(dev, "Family:%s rev:%s JTAGID[0x%08x] Detected\n",
129 soc_dev_attr->family,
130 soc_dev_attr->revision, jtag_id);
135 kfree(soc_dev_attr->revision);
141 static const struct of_device_id k3_chipinfo_of_match[] = {
142 { .compatible = "ti,am654-chipid", },
146 static struct platform_driver k3_chipinfo_driver = {
148 .name = "k3-chipinfo",
149 .of_match_table = k3_chipinfo_of_match,
151 .probe = k3_chipinfo_probe,
154 static int __init k3_chipinfo_init(void)
156 return platform_driver_register(&k3_chipinfo_driver);
158 subsys_initcall(k3_chipinfo_init);