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 { 0xBB75, "J721S2"}, 45 { 0xBB7E, "AM62X" }, 46 { 0xBB8D, "AM62AX" }, 47 }; 48 49 static int 50 k3_chipinfo_partno_to_names(unsigned int partno, 51 struct soc_device_attribute *soc_dev_attr) 52 { 53 int i; 54 55 for (i = 0; i < ARRAY_SIZE(k3_soc_ids); i++) 56 if (partno == k3_soc_ids[i].id) { 57 soc_dev_attr->family = k3_soc_ids[i].family_name; 58 return 0; 59 } 60 61 return -EINVAL; 62 } 63 64 static int k3_chipinfo_probe(struct platform_device *pdev) 65 { 66 struct device_node *node = pdev->dev.of_node; 67 struct soc_device_attribute *soc_dev_attr; 68 struct device *dev = &pdev->dev; 69 struct soc_device *soc_dev; 70 struct regmap *regmap; 71 u32 partno_id; 72 u32 variant; 73 u32 jtag_id; 74 u32 mfg; 75 int ret; 76 77 regmap = device_node_to_regmap(node); 78 if (IS_ERR(regmap)) 79 return PTR_ERR(regmap); 80 81 ret = regmap_read(regmap, CTRLMMR_WKUP_JTAGID_REG, &jtag_id); 82 if (ret < 0) 83 return ret; 84 85 mfg = (jtag_id & CTRLMMR_WKUP_JTAGID_MFG_MASK) >> 86 CTRLMMR_WKUP_JTAGID_MFG_SHIFT; 87 88 if (mfg != CTRLMMR_WKUP_JTAGID_MFG_TI) { 89 dev_err(dev, "Invalid MFG SoC\n"); 90 return -ENODEV; 91 } 92 93 variant = (jtag_id & CTRLMMR_WKUP_JTAGID_VARIANT_MASK) >> 94 CTRLMMR_WKUP_JTAGID_VARIANT_SHIFT; 95 variant++; 96 97 partno_id = (jtag_id & CTRLMMR_WKUP_JTAGID_PARTNO_MASK) >> 98 CTRLMMR_WKUP_JTAGID_PARTNO_SHIFT; 99 100 soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL); 101 if (!soc_dev_attr) 102 return -ENOMEM; 103 104 soc_dev_attr->revision = kasprintf(GFP_KERNEL, "SR%x.0", variant); 105 if (!soc_dev_attr->revision) { 106 ret = -ENOMEM; 107 goto err; 108 } 109 110 ret = k3_chipinfo_partno_to_names(partno_id, soc_dev_attr); 111 if (ret) { 112 dev_err(dev, "Unknown SoC JTAGID[0x%08X]\n", jtag_id); 113 ret = -ENODEV; 114 goto err_free_rev; 115 } 116 117 node = of_find_node_by_path("/"); 118 of_property_read_string(node, "model", &soc_dev_attr->machine); 119 of_node_put(node); 120 121 soc_dev = soc_device_register(soc_dev_attr); 122 if (IS_ERR(soc_dev)) { 123 ret = PTR_ERR(soc_dev); 124 goto err_free_rev; 125 } 126 127 dev_info(dev, "Family:%s rev:%s JTAGID[0x%08x] Detected\n", 128 soc_dev_attr->family, 129 soc_dev_attr->revision, jtag_id); 130 131 return 0; 132 133 err_free_rev: 134 kfree(soc_dev_attr->revision); 135 err: 136 kfree(soc_dev_attr); 137 return ret; 138 } 139 140 static const struct of_device_id k3_chipinfo_of_match[] = { 141 { .compatible = "ti,am654-chipid", }, 142 { /* sentinel */ }, 143 }; 144 145 static struct platform_driver k3_chipinfo_driver = { 146 .driver = { 147 .name = "k3-chipinfo", 148 .of_match_table = k3_chipinfo_of_match, 149 }, 150 .probe = k3_chipinfo_probe, 151 }; 152 153 static int __init k3_chipinfo_init(void) 154 { 155 return platform_driver_register(&k3_chipinfo_driver); 156 } 157 subsys_initcall(k3_chipinfo_init); 158