drivers/char/tpm/tpm_tis.c

   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 <linux/dmi.h>
  31 #include "tpm.h"
  32 #include "tpm_tis_core.h"
  33
  34 struct tpm_info {
  35         struct resource res;
  36         /* irq > 0 means: use irq $irq;
  37          * irq = 0 means: autoprobe for an irq;
  38          * irq = -1 means: no irq support
  39          */
  40         int irq;
  41 };
  42
  43 struct tpm_tis_tcg_phy {
  44         struct tpm_tis_data priv;
  45         void __iomem *iobase;
  46 };
  47
  48 static inline struct tpm_tis_tcg_phy *to_tpm_tis_tcg_phy(struct tpm_tis_data *data)
  49 {
  50         return container_of(data, struct tpm_tis_tcg_phy, priv);
  51 }
  52
  53 static int interrupts = -1;
  54 module_param(interrupts, int, 0444);
  55 MODULE_PARM_DESC(interrupts, "Enable interrupts");
  56
  57 static bool itpm;
  58 module_param(itpm, bool, 0444);
  59 MODULE_PARM_DESC(itpm, "Force iTPM workarounds (found on some Lenovo laptops)");
  60
  61 static bool force;
  62 #ifdef CONFIG_X86
  63 module_param(force, bool, 0444);
  64 MODULE_PARM_DESC(force, "Force device probe rather than using ACPI entry");
  65 #endif
  66
  67 static int tpm_tis_disable_irq(const struct dmi_system_id *d)
  68 {
  69         if (interrupts == -1) {
  70                 pr_notice("tpm_tis: %s detected: disabling interrupts.\n", d->ident);
  71                 interrupts = 0;
  72         }
  73
  74         return 0;
  75 }
  76
  77 static const struct dmi_system_id tpm_tis_dmi_table[] = {
  78         {
  79                 .callback = tpm_tis_disable_irq,
  80                 .ident = "ThinkPad T490s",
  81                 .matches = {
  82                         DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
  83                         DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T490s"),
  84                 },
  85         },
  86         {}
  87 };
  88
  89 #if defined(CONFIG_PNP) && defined(CONFIG_ACPI)
  90 static int has_hid(struct acpi_device *dev, const char *hid)
  91 {
  92         struct acpi_hardware_id *id;
  93
  94         list_for_each_entry(id, &dev->pnp.ids, list)
  95                 if (!strcmp(hid, id->id))
  96                         return 1;
  97
  98         return 0;
  99 }
 100
 101 static inline int is_itpm(struct acpi_device *dev)
 102 {
 103         if (!dev)
 104                 return 0;
 105         return has_hid(dev, "INTC0102");
 106 }
 107 #else
 108 static inline int is_itpm(struct acpi_device *dev)
 109 {
 110         return 0;
 111 }
 112 #endif
 113
 114 #if defined(CONFIG_ACPI)
 115 #define DEVICE_IS_TPM2 1
 116
 117 static const struct acpi_device_id tpm_acpi_tbl[] = {
 118         {"MSFT0101", DEVICE_IS_TPM2},
 119         {},
 120 };
 121 MODULE_DEVICE_TABLE(acpi, tpm_acpi_tbl);
 122
 123 static int check_acpi_tpm2(struct device *dev)
 124 {
 125         const struct acpi_device_id *aid = acpi_match_device(tpm_acpi_tbl, dev);
 126         struct acpi_table_tpm2 *tbl;
 127         acpi_status st;
 128
 129         if (!aid || aid->driver_data != DEVICE_IS_TPM2)
 130                 return 0;
 131
 132         /* If the ACPI TPM2 signature is matched then a global ACPI_SIG_TPM2
 133          * table is mandatory
 134          */
 135         st =
 136             acpi_get_table(ACPI_SIG_TPM2, 1, (struct acpi_table_header **)&tbl);
 137         if (ACPI_FAILURE(st) || tbl->header.length < sizeof(*tbl)) {
 138                 dev_err(dev, FW_BUG "failed to get TPM2 ACPI table\n");
 139                 return -EINVAL;
 140         }
 141
 142         /* The tpm2_crb driver handles this device */
 143         if (tbl->start_method != ACPI_TPM2_MEMORY_MAPPED)
 144                 return -ENODEV;
 145
 146         return 0;
 147 }
 148 #else
 149 static int check_acpi_tpm2(struct device *dev)
 150 {
 151         return 0;
 152 }
 153 #endif
 154
 155 static int tpm_tcg_read_bytes(struct tpm_tis_data *data, u32 addr, u16 len,
 156                               u8 *result)
 157 {
 158         struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);
 159
 160         while (len--)
 161                 *result++ = ioread8(phy->iobase + addr);
 162
 163         return 0;
 164 }
 165
 166 static int tpm_tcg_write_bytes(struct tpm_tis_data *data, u32 addr, u16 len,
 167                                const u8 *value)
 168 {
 169         struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);
 170
 171         while (len--)
 172                 iowrite8(*value++, phy->iobase + addr);
 173
 174         return 0;
 175 }
 176
 177 static int tpm_tcg_read16(struct tpm_tis_data *data, u32 addr, u16 *result)
 178 {
 179         struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);
 180
 181         *result = ioread16(phy->iobase + addr);
 182
 183         return 0;
 184 }
 185
 186 static int tpm_tcg_read32(struct tpm_tis_data *data, u32 addr, u32 *result)
 187 {
 188         struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);
 189
 190         *result = ioread32(phy->iobase + addr);
 191
 192         return 0;
 193 }
 194
 195 static int tpm_tcg_write32(struct tpm_tis_data *data, u32 addr, u32 value)
 196 {
 197         struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);
 198
 199         iowrite32(value, phy->iobase + addr);
 200
 201         return 0;
 202 }
 203
 204 static const struct tpm_tis_phy_ops tpm_tcg = {
 205         .read_bytes = tpm_tcg_read_bytes,
 206         .write_bytes = tpm_tcg_write_bytes,
 207         .read16 = tpm_tcg_read16,
 208         .read32 = tpm_tcg_read32,
 209         .write32 = tpm_tcg_write32,
 210 };
 211
 212 static int tpm_tis_init(struct device *dev, struct tpm_info *tpm_info)
 213 {
 214         struct tpm_tis_tcg_phy *phy;
 215         int irq = -1;
 216         int rc;
 217
 218         dmi_check_system(tpm_tis_dmi_table);
 219
 220         rc = check_acpi_tpm2(dev);
 221         if (rc)
 222                 return rc;
 223
 224         phy = devm_kzalloc(dev, sizeof(struct tpm_tis_tcg_phy), GFP_KERNEL);
 225         if (phy == NULL)
 226                 return -ENOMEM;
 227
 228         phy->iobase = devm_ioremap_resource(dev, &tpm_info->res);
 229         if (IS_ERR(phy->iobase))
 230                 return PTR_ERR(phy->iobase);
 231
 232         if (interrupts)
 233                 irq = tpm_info->irq;
 234
 235         if (itpm || is_itpm(ACPI_COMPANION(dev)))
 236                 phy->priv.flags |= TPM_TIS_ITPM_WORKAROUND;
 237
 238         return tpm_tis_core_init(dev, &phy->priv, irq, &tpm_tcg,
 239                                  ACPI_HANDLE(dev));
 240 }
 241
 242 static SIMPLE_DEV_PM_OPS(tpm_tis_pm, tpm_pm_suspend, tpm_tis_resume);
 243
 244 static int tpm_tis_pnp_init(struct pnp_dev *pnp_dev,
 245                             const struct pnp_device_id *pnp_id)
 246 {
 247         struct tpm_info tpm_info = {};
 248         struct resource *res;
 249
 250         res = pnp_get_resource(pnp_dev, IORESOURCE_MEM, 0);
 251         if (!res)
 252                 return -ENODEV;
 253         tpm_info.res = *res;
 254
 255         if (pnp_irq_valid(pnp_dev, 0))
 256                 tpm_info.irq = pnp_irq(pnp_dev, 0);
 257         else
 258                 tpm_info.irq = -1;
 259
 260         return tpm_tis_init(&pnp_dev->dev, &tpm_info);
 261 }
 262
 263 /*
 264  * There is a known bug caused by 93e1b7d42e1e ("[PATCH] tpm: add HID module
 265  * parameter"). This commit added IFX0102 device ID, which is also used by
 266  * tpm_infineon but ignored to add quirks to probe which driver ought to be
 267  * used.
 268  */
 269
 270 static struct pnp_device_id tpm_pnp_tbl[] = {
 271         {"PNP0C31", 0},         /* TPM */
 272         {"ATM1200", 0},         /* Atmel */
 273         {"IFX0102", 0},         /* Infineon */
 274         {"BCM0101", 0},         /* Broadcom */
 275         {"BCM0102", 0},         /* Broadcom */
 276         {"NSC1200", 0},         /* National */
 277         {"ICO0102", 0},         /* Intel */
 278         /* Add new here */
 279         {"", 0},                /* User Specified */
 280         {"", 0}                 /* Terminator */
 281 };
 282 MODULE_DEVICE_TABLE(pnp, tpm_pnp_tbl);
 283
 284 static void tpm_tis_pnp_remove(struct pnp_dev *dev)
 285 {
 286         struct tpm_chip *chip = pnp_get_drvdata(dev);
 287
 288         tpm_chip_unregister(chip);
 289         tpm_tis_remove(chip);
 290 }
 291
 292 static struct pnp_driver tis_pnp_driver = {
 293         .name = "tpm_tis",
 294         .id_table = tpm_pnp_tbl,
 295         .probe = tpm_tis_pnp_init,
 296         .remove = tpm_tis_pnp_remove,
 297         .driver = {
 298                 .pm = &tpm_tis_pm,
 299         },
 300 };
 301
 302 #define TIS_HID_USR_IDX (ARRAY_SIZE(tpm_pnp_tbl) - 2)
 303 module_param_string(hid, tpm_pnp_tbl[TIS_HID_USR_IDX].id,
 304                     sizeof(tpm_pnp_tbl[TIS_HID_USR_IDX].id), 0444);
 305 MODULE_PARM_DESC(hid, "Set additional specific HID for this driver to probe");
 306
 307 static struct platform_device *force_pdev;
 308
 309 static int tpm_tis_plat_probe(struct platform_device *pdev)
 310 {
 311         struct tpm_info tpm_info = {};
 312         struct resource *res;
 313
 314         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 315         if (res == NULL) {
 316                 dev_err(&pdev->dev, "no memory resource defined\n");
 317                 return -ENODEV;
 318         }
 319         tpm_info.res = *res;
 320
 321         tpm_info.irq = platform_get_irq_optional(pdev, 0);
 322         if (tpm_info.irq <= 0) {
 323                 if (pdev != force_pdev)
 324                         tpm_info.irq = -1;
 325                 else
 326                         /* When forcing auto probe the IRQ */
 327                         tpm_info.irq = 0;
 328         }
 329
 330         return tpm_tis_init(&pdev->dev, &tpm_info);
 331 }
 332
 333 static int tpm_tis_plat_remove(struct platform_device *pdev)
 334 {
 335         struct tpm_chip *chip = dev_get_drvdata(&pdev->dev);
 336
 337         tpm_chip_unregister(chip);
 338         tpm_tis_remove(chip);
 339
 340         return 0;
 341 }
 342
 343 #ifdef CONFIG_OF
 344 static const struct of_device_id tis_of_platform_match[] = {
 345         {.compatible = "tcg,tpm-tis-mmio"},
 346         {},
 347 };
 348 MODULE_DEVICE_TABLE(of, tis_of_platform_match);
 349 #endif
 350
 351 static struct platform_driver tis_drv = {
 352         .probe = tpm_tis_plat_probe,
 353         .remove = tpm_tis_plat_remove,
 354         .driver = {
 355                 .name           = "tpm_tis",
 356                 .pm             = &tpm_tis_pm,
 357                 .of_match_table = of_match_ptr(tis_of_platform_match),
 358                 .acpi_match_table = ACPI_PTR(tpm_acpi_tbl),
 359         },
 360 };
 361
 362 static int tpm_tis_force_device(void)
 363 {
 364         struct platform_device *pdev;
 365         static const struct resource x86_resources[] = {
 366                 {
 367                         .start = 0xFED40000,
 368                         .end = 0xFED40000 + TIS_MEM_LEN - 1,
 369                         .flags = IORESOURCE_MEM,
 370                 },
 371         };
 372
 373         if (!force)
 374                 return 0;
 375
 376         /* The driver core will match the name tpm_tis of the device to
 377          * the tpm_tis platform driver and complete the setup via
 378          * tpm_tis_plat_probe
 379          */
 380         pdev = platform_device_register_simple("tpm_tis", -1, x86_resources,
 381                                                ARRAY_SIZE(x86_resources));
 382         if (IS_ERR(pdev))
 383                 return PTR_ERR(pdev);
 384         force_pdev = pdev;
 385
 386         return 0;
 387 }
 388
 389 static int __init init_tis(void)
 390 {
 391         int rc;
 392
 393         rc = tpm_tis_force_device();
 394         if (rc)
 395                 goto err_force;
 396
 397         rc = platform_driver_register(&tis_drv);
 398         if (rc)
 399                 goto err_platform;
 400
 401
 402         if (IS_ENABLED(CONFIG_PNP)) {
 403                 rc = pnp_register_driver(&tis_pnp_driver);
 404                 if (rc)
 405                         goto err_pnp;
 406         }
 407
 408         return 0;
 409
 410 err_pnp:
 411         platform_driver_unregister(&tis_drv);
 412 err_platform:
 413         if (force_pdev)
 414                 platform_device_unregister(force_pdev);
 415 err_force:
 416         return rc;
 417 }
 418
 419 static void __exit cleanup_tis(void)
 420 {
 421         pnp_unregister_driver(&tis_pnp_driver);
 422         platform_driver_unregister(&tis_drv);
 423
 424         if (force_pdev)
 425                 platform_device_unregister(force_pdev);
 426 }
 427
 428 module_init(init_tis);
 429 module_exit(cleanup_tis);
 430 MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
 431 MODULE_DESCRIPTION("TPM Driver");
 432 MODULE_VERSION("2.0");
 433 MODULE_LICENSE("GPL");