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 * 0 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 #define JTAG_ID_PARTNO_AM65X 0xBB5A 37 #define JTAG_ID_PARTNO_J721E 0xBB64 38 #define JTAG_ID_PARTNO_J7200 0xBB6D 39 #define JTAG_ID_PARTNO_AM64X 0xBB38 40 #define JTAG_ID_PARTNO_J721S2 0xBB75 41 #define JTAG_ID_PARTNO_AM62X 0xBB7E 42 #define JTAG_ID_PARTNO_J784S4 0xBB80 43 #define JTAG_ID_PARTNO_AM62AX 0xBB8D 44 #define JTAG_ID_PARTNO_AM62PX 0xBB9D 45 #define JTAG_ID_PARTNO_J722S 0xBBA0 46 47 static const struct k3_soc_id { 48 unsigned int id; 49 const char *family_name; 50 } k3_soc_ids[] = { 51 { JTAG_ID_PARTNO_AM65X, "AM65X" }, 52 { JTAG_ID_PARTNO_J721E, "J721E" }, 53 { JTAG_ID_PARTNO_J7200, "J7200" }, 54 { JTAG_ID_PARTNO_AM64X, "AM64X" }, 55 { JTAG_ID_PARTNO_J721S2, "J721S2"}, 56 { JTAG_ID_PARTNO_AM62X, "AM62X" }, 57 { JTAG_ID_PARTNO_J784S4, "J784S4" }, 58 { JTAG_ID_PARTNO_AM62AX, "AM62AX" }, 59 { JTAG_ID_PARTNO_AM62PX, "AM62PX" }, 60 { JTAG_ID_PARTNO_J722S, "J722S" }, 61 }; 62 63 static const char * const j721e_rev_string_map[] = { 64 "1.0", "1.1", "2.0", 65 }; 66 67 static int 68 k3_chipinfo_partno_to_names(unsigned int partno, 69 struct soc_device_attribute *soc_dev_attr) 70 { 71 int i; 72 73 for (i = 0; i < ARRAY_SIZE(k3_soc_ids); i++) 74 if (partno == k3_soc_ids[i].id) { 75 soc_dev_attr->family = k3_soc_ids[i].family_name; 76 return 0; 77 } 78 79 return -ENODEV; 80 } 81 82 static int 83 k3_chipinfo_variant_to_sr(unsigned int partno, unsigned int variant, 84 struct soc_device_attribute *soc_dev_attr) 85 { 86 switch (partno) { 87 case JTAG_ID_PARTNO_J721E: 88 if (variant >= ARRAY_SIZE(j721e_rev_string_map)) 89 goto err_unknown_variant; 90 soc_dev_attr->revision = kasprintf(GFP_KERNEL, "SR%s", 91 j721e_rev_string_map[variant]); 92 break; 93 default: 94 variant++; 95 soc_dev_attr->revision = kasprintf(GFP_KERNEL, "SR%x.0", 96 variant); 97 } 98 99 if (!soc_dev_attr->revision) 100 return -ENOMEM; 101 102 return 0; 103 104 err_unknown_variant: 105 return -ENODEV; 106 } 107 108 static int k3_chipinfo_probe(struct platform_device *pdev) 109 { 110 struct device_node *node = pdev->dev.of_node; 111 struct soc_device_attribute *soc_dev_attr; 112 struct device *dev = &pdev->dev; 113 struct soc_device *soc_dev; 114 struct regmap *regmap; 115 u32 partno_id; 116 u32 variant; 117 u32 jtag_id; 118 u32 mfg; 119 int ret; 120 121 regmap = device_node_to_regmap(node); 122 if (IS_ERR(regmap)) 123 return PTR_ERR(regmap); 124 125 ret = regmap_read(regmap, CTRLMMR_WKUP_JTAGID_REG, &jtag_id); 126 if (ret < 0) 127 return ret; 128 129 mfg = (jtag_id & CTRLMMR_WKUP_JTAGID_MFG_MASK) >> 130 CTRLMMR_WKUP_JTAGID_MFG_SHIFT; 131 132 if (mfg != CTRLMMR_WKUP_JTAGID_MFG_TI) { 133 dev_err(dev, "Invalid MFG SoC\n"); 134 return -ENODEV; 135 } 136 137 variant = (jtag_id & CTRLMMR_WKUP_JTAGID_VARIANT_MASK) >> 138 CTRLMMR_WKUP_JTAGID_VARIANT_SHIFT; 139 140 partno_id = (jtag_id & CTRLMMR_WKUP_JTAGID_PARTNO_MASK) >> 141 CTRLMMR_WKUP_JTAGID_PARTNO_SHIFT; 142 143 soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL); 144 if (!soc_dev_attr) 145 return -ENOMEM; 146 147 ret = k3_chipinfo_partno_to_names(partno_id, soc_dev_attr); 148 if (ret) { 149 dev_err(dev, "Unknown SoC JTAGID[0x%08X]: %d\n", jtag_id, ret); 150 goto err; 151 } 152 153 ret = k3_chipinfo_variant_to_sr(partno_id, variant, soc_dev_attr); 154 if (ret) { 155 dev_err(dev, "Unknown SoC SR[0x%08X]: %d\n", jtag_id, ret); 156 goto err; 157 } 158 159 node = of_find_node_by_path("/"); 160 of_property_read_string(node, "model", &soc_dev_attr->machine); 161 of_node_put(node); 162 163 soc_dev = soc_device_register(soc_dev_attr); 164 if (IS_ERR(soc_dev)) { 165 ret = PTR_ERR(soc_dev); 166 goto err_free_rev; 167 } 168 169 dev_info(dev, "Family:%s rev:%s JTAGID[0x%08x] Detected\n", 170 soc_dev_attr->family, 171 soc_dev_attr->revision, jtag_id); 172 173 return 0; 174 175 err_free_rev: 176 kfree(soc_dev_attr->revision); 177 err: 178 kfree(soc_dev_attr); 179 return ret; 180 } 181 182 static const struct of_device_id k3_chipinfo_of_match[] = { 183 { .compatible = "ti,am654-chipid", }, 184 { /* sentinel */ }, 185 }; 186 187 static struct platform_driver k3_chipinfo_driver = { 188 .driver = { 189 .name = "k3-chipinfo", 190 .of_match_table = k3_chipinfo_of_match, 191 }, 192 .probe = k3_chipinfo_probe, 193 }; 194 195 static int __init k3_chipinfo_init(void) 196 { 197 return platform_driver_register(&k3_chipinfo_driver); 198 } 199 subsys_initcall(k3_chipinfo_init); 200