1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2005, 2006 IBM Corporation 4 * Copyright (C) 2014, 2015 Intel Corporation 5 * 6 * Authors: 7 * Leendert van Doorn <leendert@watson.ibm.com> 8 * Kylene Hall <kjhall@us.ibm.com> 9 * 10 * Maintained by: <tpmdd-devel@lists.sourceforge.net> 11 * 12 * Device driver for TCG/TCPA TPM (trusted platform module). 13 * Specifications at www.trustedcomputinggroup.org 14 * 15 * This device driver implements the TPM interface as defined in 16 * the TCG TPM Interface Spec version 1.2, revision 1.0. 17 */ 18 #include <linux/init.h> 19 #include <linux/module.h> 20 #include <linux/moduleparam.h> 21 #include <linux/pnp.h> 22 #include <linux/slab.h> 23 #include <linux/interrupt.h> 24 #include <linux/wait.h> 25 #include <linux/acpi.h> 26 #include <linux/freezer.h> 27 #include <linux/of.h> 28 #include <linux/of_device.h> 29 #include <linux/kernel.h> 30 #include "tpm.h" 31 #include "tpm_tis_core.h" 32 33 struct tpm_info { 34 struct resource res; 35 /* irq > 0 means: use irq $irq; 36 * irq = 0 means: autoprobe for an irq; 37 * irq = -1 means: no irq support 38 */ 39 int irq; 40 }; 41 42 struct tpm_tis_tcg_phy { 43 struct tpm_tis_data priv; 44 void __iomem *iobase; 45 }; 46 47 static inline struct tpm_tis_tcg_phy *to_tpm_tis_tcg_phy(struct tpm_tis_data *data) 48 { 49 return container_of(data, struct tpm_tis_tcg_phy, priv); 50 } 51 52 static bool interrupts = true; 53 module_param(interrupts, bool, 0444); 54 MODULE_PARM_DESC(interrupts, "Enable interrupts"); 55 56 static bool itpm; 57 module_param(itpm, bool, 0444); 58 MODULE_PARM_DESC(itpm, "Force iTPM workarounds (found on some Lenovo laptops)"); 59 60 static bool force; 61 #ifdef CONFIG_X86 62 module_param(force, bool, 0444); 63 MODULE_PARM_DESC(force, "Force device probe rather than using ACPI entry"); 64 #endif 65 66 #if defined(CONFIG_PNP) && defined(CONFIG_ACPI) 67 static int has_hid(struct acpi_device *dev, const char *hid) 68 { 69 struct acpi_hardware_id *id; 70 71 list_for_each_entry(id, &dev->pnp.ids, list) 72 if (!strcmp(hid, id->id)) 73 return 1; 74 75 return 0; 76 } 77 78 static inline int is_itpm(struct acpi_device *dev) 79 { 80 if (!dev) 81 return 0; 82 return has_hid(dev, "INTC0102"); 83 } 84 #else 85 static inline int is_itpm(struct acpi_device *dev) 86 { 87 return 0; 88 } 89 #endif 90 91 #if defined(CONFIG_ACPI) 92 #define DEVICE_IS_TPM2 1 93 94 static const struct acpi_device_id tpm_acpi_tbl[] = { 95 {"MSFT0101", DEVICE_IS_TPM2}, 96 {}, 97 }; 98 MODULE_DEVICE_TABLE(acpi, tpm_acpi_tbl); 99 100 static int check_acpi_tpm2(struct device *dev) 101 { 102 const struct acpi_device_id *aid = acpi_match_device(tpm_acpi_tbl, dev); 103 struct acpi_table_tpm2 *tbl; 104 acpi_status st; 105 106 if (!aid || aid->driver_data != DEVICE_IS_TPM2) 107 return 0; 108 109 /* If the ACPI TPM2 signature is matched then a global ACPI_SIG_TPM2 110 * table is mandatory 111 */ 112 st = 113 acpi_get_table(ACPI_SIG_TPM2, 1, (struct acpi_table_header **)&tbl); 114 if (ACPI_FAILURE(st) || tbl->header.length < sizeof(*tbl)) { 115 dev_err(dev, FW_BUG "failed to get TPM2 ACPI table\n"); 116 return -EINVAL; 117 } 118 119 /* The tpm2_crb driver handles this device */ 120 if (tbl->start_method != ACPI_TPM2_MEMORY_MAPPED) 121 return -ENODEV; 122 123 return 0; 124 } 125 #else 126 static int check_acpi_tpm2(struct device *dev) 127 { 128 return 0; 129 } 130 #endif 131 132 static int tpm_tcg_read_bytes(struct tpm_tis_data *data, u32 addr, u16 len, 133 u8 *result) 134 { 135 struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data); 136 137 while (len--) 138 *result++ = ioread8(phy->iobase + addr); 139 140 return 0; 141 } 142 143 static int tpm_tcg_write_bytes(struct tpm_tis_data *data, u32 addr, u16 len, 144 const u8 *value) 145 { 146 struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data); 147 148 while (len--) 149 iowrite8(*value++, phy->iobase + addr); 150 151 return 0; 152 } 153 154 static int tpm_tcg_read16(struct tpm_tis_data *data, u32 addr, u16 *result) 155 { 156 struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data); 157 158 *result = ioread16(phy->iobase + addr); 159 160 return 0; 161 } 162 163 static int tpm_tcg_read32(struct tpm_tis_data *data, u32 addr, u32 *result) 164 { 165 struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data); 166 167 *result = ioread32(phy->iobase + addr); 168 169 return 0; 170 } 171 172 static int tpm_tcg_write32(struct tpm_tis_data *data, u32 addr, u32 value) 173 { 174 struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data); 175 176 iowrite32(value, phy->iobase + addr); 177 178 return 0; 179 } 180 181 static const struct tpm_tis_phy_ops tpm_tcg = { 182 .read_bytes = tpm_tcg_read_bytes, 183 .write_bytes = tpm_tcg_write_bytes, 184 .read16 = tpm_tcg_read16, 185 .read32 = tpm_tcg_read32, 186 .write32 = tpm_tcg_write32, 187 }; 188 189 static int tpm_tis_init(struct device *dev, struct tpm_info *tpm_info) 190 { 191 struct tpm_tis_tcg_phy *phy; 192 int irq = -1; 193 int rc; 194 195 rc = check_acpi_tpm2(dev); 196 if (rc) 197 return rc; 198 199 phy = devm_kzalloc(dev, sizeof(struct tpm_tis_tcg_phy), GFP_KERNEL); 200 if (phy == NULL) 201 return -ENOMEM; 202 203 phy->iobase = devm_ioremap_resource(dev, &tpm_info->res); 204 if (IS_ERR(phy->iobase)) 205 return PTR_ERR(phy->iobase); 206 207 if (interrupts) 208 irq = tpm_info->irq; 209 210 if (itpm || is_itpm(ACPI_COMPANION(dev))) 211 phy->priv.flags |= TPM_TIS_ITPM_WORKAROUND; 212 213 return tpm_tis_core_init(dev, &phy->priv, irq, &tpm_tcg, 214 ACPI_HANDLE(dev)); 215 } 216 217 static SIMPLE_DEV_PM_OPS(tpm_tis_pm, tpm_pm_suspend, tpm_tis_resume); 218 219 static int tpm_tis_pnp_init(struct pnp_dev *pnp_dev, 220 const struct pnp_device_id *pnp_id) 221 { 222 struct tpm_info tpm_info = {}; 223 struct resource *res; 224 225 res = pnp_get_resource(pnp_dev, IORESOURCE_MEM, 0); 226 if (!res) 227 return -ENODEV; 228 tpm_info.res = *res; 229 230 if (pnp_irq_valid(pnp_dev, 0)) 231 tpm_info.irq = pnp_irq(pnp_dev, 0); 232 else 233 tpm_info.irq = -1; 234 235 return tpm_tis_init(&pnp_dev->dev, &tpm_info); 236 } 237 238 static struct pnp_device_id tpm_pnp_tbl[] = { 239 {"PNP0C31", 0}, /* TPM */ 240 {"ATM1200", 0}, /* Atmel */ 241 {"IFX0102", 0}, /* Infineon */ 242 {"BCM0101", 0}, /* Broadcom */ 243 {"BCM0102", 0}, /* Broadcom */ 244 {"NSC1200", 0}, /* National */ 245 {"ICO0102", 0}, /* Intel */ 246 /* Add new here */ 247 {"", 0}, /* User Specified */ 248 {"", 0} /* Terminator */ 249 }; 250 MODULE_DEVICE_TABLE(pnp, tpm_pnp_tbl); 251 252 static void tpm_tis_pnp_remove(struct pnp_dev *dev) 253 { 254 struct tpm_chip *chip = pnp_get_drvdata(dev); 255 256 tpm_chip_unregister(chip); 257 tpm_tis_remove(chip); 258 } 259 260 static struct pnp_driver tis_pnp_driver = { 261 .name = "tpm_tis", 262 .id_table = tpm_pnp_tbl, 263 .probe = tpm_tis_pnp_init, 264 .remove = tpm_tis_pnp_remove, 265 .driver = { 266 .pm = &tpm_tis_pm, 267 }, 268 }; 269 270 #define TIS_HID_USR_IDX (ARRAY_SIZE(tpm_pnp_tbl) - 2) 271 module_param_string(hid, tpm_pnp_tbl[TIS_HID_USR_IDX].id, 272 sizeof(tpm_pnp_tbl[TIS_HID_USR_IDX].id), 0444); 273 MODULE_PARM_DESC(hid, "Set additional specific HID for this driver to probe"); 274 275 static struct platform_device *force_pdev; 276 277 static int tpm_tis_plat_probe(struct platform_device *pdev) 278 { 279 struct tpm_info tpm_info = {}; 280 struct resource *res; 281 282 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 283 if (res == NULL) { 284 dev_err(&pdev->dev, "no memory resource defined\n"); 285 return -ENODEV; 286 } 287 tpm_info.res = *res; 288 289 tpm_info.irq = platform_get_irq_optional(pdev, 0); 290 if (tpm_info.irq <= 0) { 291 if (pdev != force_pdev) 292 tpm_info.irq = -1; 293 else 294 /* When forcing auto probe the IRQ */ 295 tpm_info.irq = 0; 296 } 297 298 return tpm_tis_init(&pdev->dev, &tpm_info); 299 } 300 301 static int tpm_tis_plat_remove(struct platform_device *pdev) 302 { 303 struct tpm_chip *chip = dev_get_drvdata(&pdev->dev); 304 305 tpm_chip_unregister(chip); 306 tpm_tis_remove(chip); 307 308 return 0; 309 } 310 311 #ifdef CONFIG_OF 312 static const struct of_device_id tis_of_platform_match[] = { 313 {.compatible = "tcg,tpm-tis-mmio"}, 314 {}, 315 }; 316 MODULE_DEVICE_TABLE(of, tis_of_platform_match); 317 #endif 318 319 static struct platform_driver tis_drv = { 320 .probe = tpm_tis_plat_probe, 321 .remove = tpm_tis_plat_remove, 322 .driver = { 323 .name = "tpm_tis", 324 .pm = &tpm_tis_pm, 325 .of_match_table = of_match_ptr(tis_of_platform_match), 326 .acpi_match_table = ACPI_PTR(tpm_acpi_tbl), 327 }, 328 }; 329 330 static int tpm_tis_force_device(void) 331 { 332 struct platform_device *pdev; 333 static const struct resource x86_resources[] = { 334 { 335 .start = 0xFED40000, 336 .end = 0xFED40000 + TIS_MEM_LEN - 1, 337 .flags = IORESOURCE_MEM, 338 }, 339 }; 340 341 if (!force) 342 return 0; 343 344 /* The driver core will match the name tpm_tis of the device to 345 * the tpm_tis platform driver and complete the setup via 346 * tpm_tis_plat_probe 347 */ 348 pdev = platform_device_register_simple("tpm_tis", -1, x86_resources, 349 ARRAY_SIZE(x86_resources)); 350 if (IS_ERR(pdev)) 351 return PTR_ERR(pdev); 352 force_pdev = pdev; 353 354 return 0; 355 } 356 357 static int __init init_tis(void) 358 { 359 int rc; 360 361 rc = tpm_tis_force_device(); 362 if (rc) 363 goto err_force; 364 365 rc = platform_driver_register(&tis_drv); 366 if (rc) 367 goto err_platform; 368 369 370 if (IS_ENABLED(CONFIG_PNP)) { 371 rc = pnp_register_driver(&tis_pnp_driver); 372 if (rc) 373 goto err_pnp; 374 } 375 376 return 0; 377 378 err_pnp: 379 platform_driver_unregister(&tis_drv); 380 err_platform: 381 if (force_pdev) 382 platform_device_unregister(force_pdev); 383 err_force: 384 return rc; 385 } 386 387 static void __exit cleanup_tis(void) 388 { 389 pnp_unregister_driver(&tis_pnp_driver); 390 platform_driver_unregister(&tis_drv); 391 392 if (force_pdev) 393 platform_device_unregister(force_pdev); 394 } 395 396 module_init(init_tis); 397 module_exit(cleanup_tis); 398 MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)"); 399 MODULE_DESCRIPTION("TPM Driver"); 400 MODULE_VERSION("2.0"); 401 MODULE_LICENSE("GPL"); 402