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 }; 43 44 static int 45 k3_chipinfo_partno_to_names(unsigned int partno, 46 struct soc_device_attribute *soc_dev_attr) 47 { 48 int i; 49 50 for (i = 0; i < ARRAY_SIZE(k3_soc_ids); i++) 51 if (partno == k3_soc_ids[i].id) { 52 soc_dev_attr->family = k3_soc_ids[i].family_name; 53 return 0; 54 } 55 56 return -EINVAL; 57 } 58 59 static int k3_chipinfo_probe(struct platform_device *pdev) 60 { 61 struct device_node *node = pdev->dev.of_node; 62 struct soc_device_attribute *soc_dev_attr; 63 struct device *dev = &pdev->dev; 64 struct soc_device *soc_dev; 65 struct regmap *regmap; 66 u32 partno_id; 67 u32 variant; 68 u32 jtag_id; 69 u32 mfg; 70 int ret; 71 72 regmap = device_node_to_regmap(node); 73 if (IS_ERR(regmap)) 74 return PTR_ERR(regmap); 75 76 ret = regmap_read(regmap, CTRLMMR_WKUP_JTAGID_REG, &jtag_id); 77 if (ret < 0) 78 return ret; 79 80 mfg = (jtag_id & CTRLMMR_WKUP_JTAGID_MFG_MASK) >> 81 CTRLMMR_WKUP_JTAGID_MFG_SHIFT; 82 83 if (mfg != CTRLMMR_WKUP_JTAGID_MFG_TI) { 84 dev_err(dev, "Invalid MFG SoC\n"); 85 return -ENODEV; 86 } 87 88 variant = (jtag_id & CTRLMMR_WKUP_JTAGID_VARIANT_MASK) >> 89 CTRLMMR_WKUP_JTAGID_VARIANT_SHIFT; 90 variant++; 91 92 partno_id = (jtag_id & CTRLMMR_WKUP_JTAGID_PARTNO_MASK) >> 93 CTRLMMR_WKUP_JTAGID_PARTNO_SHIFT; 94 95 soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL); 96 if (!soc_dev_attr) 97 return -ENOMEM; 98 99 soc_dev_attr->revision = kasprintf(GFP_KERNEL, "SR%x.0", variant); 100 if (!soc_dev_attr->revision) { 101 ret = -ENOMEM; 102 goto err; 103 } 104 105 ret = k3_chipinfo_partno_to_names(partno_id, soc_dev_attr); 106 if (ret) { 107 dev_err(dev, "Unknown SoC JTAGID[0x%08X]\n", jtag_id); 108 ret = -ENODEV; 109 goto err_free_rev; 110 } 111 112 node = of_find_node_by_path("/"); 113 of_property_read_string(node, "model", &soc_dev_attr->machine); 114 of_node_put(node); 115 116 soc_dev = soc_device_register(soc_dev_attr); 117 if (IS_ERR(soc_dev)) { 118 ret = PTR_ERR(soc_dev); 119 goto err_free_rev; 120 } 121 122 dev_info(dev, "Family:%s rev:%s JTAGID[0x%08x] Detected\n", 123 soc_dev_attr->family, 124 soc_dev_attr->revision, jtag_id); 125 126 return 0; 127 128 err_free_rev: 129 kfree(soc_dev_attr->revision); 130 err: 131 kfree(soc_dev_attr); 132 return ret; 133 } 134 135 static const struct of_device_id k3_chipinfo_of_match[] = { 136 { .compatible = "ti,am654-chipid", }, 137 { /* sentinel */ }, 138 }; 139 140 static struct platform_driver k3_chipinfo_driver = { 141 .driver = { 142 .name = "k3-chipinfo", 143 .of_match_table = k3_chipinfo_of_match, 144 }, 145 .probe = k3_chipinfo_probe, 146 }; 147 148 static int __init k3_chipinfo_init(void) 149 { 150 return platform_driver_register(&k3_chipinfo_driver); 151 } 152 subsys_initcall(k3_chipinfo_init); 153