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 { 0xBB38, "AM64X" } 44 }; 45 46 static int 47 k3_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 61 static 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; 129 130 err_free_rev: 131 kfree(soc_dev_attr->revision); 132 err: 133 kfree(soc_dev_attr); 134 return ret; 135 } 136 137 static const struct of_device_id k3_chipinfo_of_match[] = { 138 { .compatible = "ti,am654-chipid", }, 139 { /* sentinel */ }, 140 }; 141 142 static 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 }; 149 150 static int __init k3_chipinfo_init(void) 151 { 152 return platform_driver_register(&k3_chipinfo_driver); 153 } 154 subsys_initcall(k3_chipinfo_init); 155