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 }; 44 45 static int 46 k3_chipinfo_partno_to_names(unsigned int partno, 47 struct soc_device_attribute *soc_dev_attr) 48 { 49 int i; 50 51 for (i = 0; i < ARRAY_SIZE(k3_soc_ids); i++) 52 if (partno == k3_soc_ids[i].id) { 53 soc_dev_attr->family = k3_soc_ids[i].family_name; 54 return 0; 55 } 56 57 return -EINVAL; 58 } 59 60 static int k3_chipinfo_probe(struct platform_device *pdev) 61 { 62 struct device_node *node = pdev->dev.of_node; 63 struct soc_device_attribute *soc_dev_attr; 64 struct device *dev = &pdev->dev; 65 struct soc_device *soc_dev; 66 struct regmap *regmap; 67 u32 partno_id; 68 u32 variant; 69 u32 jtag_id; 70 u32 mfg; 71 int ret; 72 73 regmap = device_node_to_regmap(node); 74 if (IS_ERR(regmap)) 75 return PTR_ERR(regmap); 76 77 ret = regmap_read(regmap, CTRLMMR_WKUP_JTAGID_REG, &jtag_id); 78 if (ret < 0) 79 return ret; 80 81 mfg = (jtag_id & CTRLMMR_WKUP_JTAGID_MFG_MASK) >> 82 CTRLMMR_WKUP_JTAGID_MFG_SHIFT; 83 84 if (mfg != CTRLMMR_WKUP_JTAGID_MFG_TI) { 85 dev_err(dev, "Invalid MFG SoC\n"); 86 return -ENODEV; 87 } 88 89 variant = (jtag_id & CTRLMMR_WKUP_JTAGID_VARIANT_MASK) >> 90 CTRLMMR_WKUP_JTAGID_VARIANT_SHIFT; 91 variant++; 92 93 partno_id = (jtag_id & CTRLMMR_WKUP_JTAGID_PARTNO_MASK) >> 94 CTRLMMR_WKUP_JTAGID_PARTNO_SHIFT; 95 96 soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL); 97 if (!soc_dev_attr) 98 return -ENOMEM; 99 100 soc_dev_attr->revision = kasprintf(GFP_KERNEL, "SR%x.0", variant); 101 if (!soc_dev_attr->revision) { 102 ret = -ENOMEM; 103 goto err; 104 } 105 106 ret = k3_chipinfo_partno_to_names(partno_id, soc_dev_attr); 107 if (ret) { 108 dev_err(dev, "Unknown SoC JTAGID[0x%08X]\n", jtag_id); 109 ret = -ENODEV; 110 goto err_free_rev; 111 } 112 113 node = of_find_node_by_path("/"); 114 of_property_read_string(node, "model", &soc_dev_attr->machine); 115 of_node_put(node); 116 117 soc_dev = soc_device_register(soc_dev_attr); 118 if (IS_ERR(soc_dev)) { 119 ret = PTR_ERR(soc_dev); 120 goto err_free_rev; 121 } 122 123 dev_info(dev, "Family:%s rev:%s JTAGID[0x%08x] Detected\n", 124 soc_dev_attr->family, 125 soc_dev_attr->revision, jtag_id); 126 127 return 0; 128 129 err_free_rev: 130 kfree(soc_dev_attr->revision); 131 err: 132 kfree(soc_dev_attr); 133 return ret; 134 } 135 136 static const struct of_device_id k3_chipinfo_of_match[] = { 137 { .compatible = "ti,am654-chipid", }, 138 { /* sentinel */ }, 139 }; 140 141 static struct platform_driver k3_chipinfo_driver = { 142 .driver = { 143 .name = "k3-chipinfo", 144 .of_match_table = k3_chipinfo_of_match, 145 }, 146 .probe = k3_chipinfo_probe, 147 }; 148 149 static int __init k3_chipinfo_init(void) 150 { 151 return platform_driver_register(&k3_chipinfo_driver); 152 } 153 subsys_initcall(k3_chipinfo_init); 154