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 }; 46 47 static int 48 k3_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 62 static 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; 130 131 err_free_rev: 132 kfree(soc_dev_attr->revision); 133 err: 134 kfree(soc_dev_attr); 135 return ret; 136 } 137 138 static const struct of_device_id k3_chipinfo_of_match[] = { 139 { .compatible = "ti,am654-chipid", }, 140 { /* sentinel */ }, 141 }; 142 143 static 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 }; 150 151 static int __init k3_chipinfo_init(void) 152 { 153 return platform_driver_register(&k3_chipinfo_driver); 154 } 155 subsys_initcall(k3_chipinfo_init); 156