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 #define JTAG_ID_PARTNO_AM62LX 0xBBA7 47 48 static const struct k3_soc_id { 49 unsigned int id; 50 const char *family_name; 51 } k3_soc_ids[] = { 52 { JTAG_ID_PARTNO_AM65X, "AM65X" }, 53 { JTAG_ID_PARTNO_J721E, "J721E" }, 54 { JTAG_ID_PARTNO_J7200, "J7200" }, 55 { JTAG_ID_PARTNO_AM64X, "AM64X" }, 56 { JTAG_ID_PARTNO_J721S2, "J721S2"}, 57 { JTAG_ID_PARTNO_AM62X, "AM62X" }, 58 { JTAG_ID_PARTNO_J784S4, "J784S4" }, 59 { JTAG_ID_PARTNO_AM62AX, "AM62AX" }, 60 { JTAG_ID_PARTNO_AM62PX, "AM62PX" }, 61 { JTAG_ID_PARTNO_J722S, "J722S" }, 62 { JTAG_ID_PARTNO_AM62LX, "AM62LX" }, 63 }; 64 65 static const char * const j721e_rev_string_map[] = { 66 "1.0", "1.1", "2.0", 67 }; 68 69 static const char * const am62lx_rev_string_map[] = { 70 "1.0", "1.1", 71 }; 72 73 static int 74 k3_chipinfo_partno_to_names(unsigned int partno, 75 struct soc_device_attribute *soc_dev_attr) 76 { 77 int i; 78 79 for (i = 0; i < ARRAY_SIZE(k3_soc_ids); i++) 80 if (partno == k3_soc_ids[i].id) { 81 soc_dev_attr->family = k3_soc_ids[i].family_name; 82 return 0; 83 } 84 85 return -ENODEV; 86 } 87 88 static int 89 k3_chipinfo_variant_to_sr(unsigned int partno, unsigned int variant, 90 struct soc_device_attribute *soc_dev_attr) 91 { 92 switch (partno) { 93 case JTAG_ID_PARTNO_J721E: 94 if (variant >= ARRAY_SIZE(j721e_rev_string_map)) 95 goto err_unknown_variant; 96 soc_dev_attr->revision = kasprintf(GFP_KERNEL, "SR%s", 97 j721e_rev_string_map[variant]); 98 break; 99 case JTAG_ID_PARTNO_AM62LX: 100 if (variant >= ARRAY_SIZE(am62lx_rev_string_map)) 101 goto err_unknown_variant; 102 soc_dev_attr->revision = kasprintf(GFP_KERNEL, "SR%s", 103 am62lx_rev_string_map[variant]); 104 break; 105 default: 106 variant++; 107 soc_dev_attr->revision = kasprintf(GFP_KERNEL, "SR%x.0", 108 variant); 109 } 110 111 if (!soc_dev_attr->revision) 112 return -ENOMEM; 113 114 return 0; 115 116 err_unknown_variant: 117 return -ENODEV; 118 } 119 120 static const struct regmap_config k3_chipinfo_regmap_cfg = { 121 .reg_bits = 32, 122 .val_bits = 32, 123 .reg_stride = 4, 124 }; 125 126 static int k3_chipinfo_probe(struct platform_device *pdev) 127 { 128 struct device_node *node = pdev->dev.of_node; 129 struct soc_device_attribute *soc_dev_attr; 130 struct device *dev = &pdev->dev; 131 struct soc_device *soc_dev; 132 struct regmap *regmap; 133 void __iomem *base; 134 u32 partno_id; 135 u32 variant; 136 u32 jtag_id; 137 u32 mfg; 138 int ret; 139 140 base = devm_platform_ioremap_resource(pdev, 0); 141 if (IS_ERR(base)) 142 return PTR_ERR(base); 143 144 regmap = regmap_init_mmio(dev, base, &k3_chipinfo_regmap_cfg); 145 if (IS_ERR(regmap)) 146 return PTR_ERR(regmap); 147 148 ret = regmap_read(regmap, CTRLMMR_WKUP_JTAGID_REG, &jtag_id); 149 if (ret < 0) 150 return ret; 151 152 mfg = (jtag_id & CTRLMMR_WKUP_JTAGID_MFG_MASK) >> 153 CTRLMMR_WKUP_JTAGID_MFG_SHIFT; 154 155 if (mfg != CTRLMMR_WKUP_JTAGID_MFG_TI) { 156 dev_err(dev, "Invalid MFG SoC\n"); 157 return -ENODEV; 158 } 159 160 variant = (jtag_id & CTRLMMR_WKUP_JTAGID_VARIANT_MASK) >> 161 CTRLMMR_WKUP_JTAGID_VARIANT_SHIFT; 162 163 partno_id = (jtag_id & CTRLMMR_WKUP_JTAGID_PARTNO_MASK) >> 164 CTRLMMR_WKUP_JTAGID_PARTNO_SHIFT; 165 166 soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL); 167 if (!soc_dev_attr) 168 return -ENOMEM; 169 170 ret = k3_chipinfo_partno_to_names(partno_id, soc_dev_attr); 171 if (ret) { 172 dev_err(dev, "Unknown SoC JTAGID[0x%08X]: %d\n", jtag_id, ret); 173 goto err; 174 } 175 176 ret = k3_chipinfo_variant_to_sr(partno_id, variant, soc_dev_attr); 177 if (ret) { 178 dev_err(dev, "Unknown SoC SR[0x%08X]: %d\n", jtag_id, ret); 179 goto err; 180 } 181 182 node = of_find_node_by_path("/"); 183 of_property_read_string(node, "model", &soc_dev_attr->machine); 184 of_node_put(node); 185 186 soc_dev = soc_device_register(soc_dev_attr); 187 if (IS_ERR(soc_dev)) { 188 ret = PTR_ERR(soc_dev); 189 goto err_free_rev; 190 } 191 192 dev_info(dev, "Family:%s rev:%s JTAGID[0x%08x] Detected\n", 193 soc_dev_attr->family, 194 soc_dev_attr->revision, jtag_id); 195 196 return 0; 197 198 err_free_rev: 199 kfree(soc_dev_attr->revision); 200 err: 201 kfree(soc_dev_attr); 202 return ret; 203 } 204 205 static const struct of_device_id k3_chipinfo_of_match[] = { 206 { .compatible = "ti,am654-chipid", }, 207 { /* sentinel */ }, 208 }; 209 210 static struct platform_driver k3_chipinfo_driver = { 211 .driver = { 212 .name = "k3-chipinfo", 213 .of_match_table = k3_chipinfo_of_match, 214 }, 215 .probe = k3_chipinfo_probe, 216 }; 217 218 static int __init k3_chipinfo_init(void) 219 { 220 return platform_driver_register(&k3_chipinfo_driver); 221 } 222 subsys_initcall(k3_chipinfo_init); 223