drivers/char/tpm/tpm.h

   1 /*
   2  * Copyright (C) 2004 IBM Corporation
   3  *
   4  * Authors:
   5  * Leendert van Doorn <leendert@watson.ibm.com>
   6  * Dave Safford <safford@watson.ibm.com>
   7  * Reiner Sailer <sailer@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 program is free software; you can redistribute it and/or
  16  * modify it under the terms of the GNU General Public License as
  17  * published by the Free Software Foundation, version 2 of the
  18  * License.
  19  *
  20  */
  21 #include <linux/module.h>
  22 #include <linux/delay.h>
  23 #include <linux/fs.h>
  24 #include <linux/mutex.h>
  25 #include <linux/sched.h>
  26 #include <linux/miscdevice.h>
  27 #include <linux/platform_device.h>
  28 #include <linux/io.h>
  29 #include <linux/tpm.h>
  30
  31 enum tpm_const {
  32         TPM_MINOR = 224,        /* officially assigned */
  33         TPM_BUFSIZE = 4096,
  34         TPM_NUM_DEVICES = 256,
  35         TPM_RETRY = 50,         /* 5 seconds */
  36 };
  37
  38 enum tpm_timeout {
  39         TPM_TIMEOUT = 5,        /* msecs */
  40         TPM_TIMEOUT_RETRY = 100 /* msecs */
  41 };
  42
  43 /* TPM addresses */
  44 enum tpm_addr {
  45         TPM_SUPERIO_ADDR = 0x2E,
  46         TPM_ADDR = 0x4E,
  47 };
  48
  49 /* Indexes the duration array */
  50 enum tpm_duration {
  51         TPM_SHORT = 0,
  52         TPM_MEDIUM = 1,
  53         TPM_LONG = 2,
  54         TPM_UNDEFINED,
  55 };
  56
  57 #define TPM_WARN_RETRY          0x800
  58 #define TPM_WARN_DOING_SELFTEST 0x802
  59 #define TPM_ERR_DEACTIVATED     0x6
  60 #define TPM_ERR_DISABLED        0x7
  61 #define TPM_ERR_INVALID_POSTINIT 38
  62
  63 #define TPM_HEADER_SIZE         10
  64 struct tpm_chip;
  65
  66 struct tpm_vendor_specific {
  67         void __iomem *iobase;           /* ioremapped address */
  68         unsigned long base;             /* TPM base address */
  69
  70         int irq;
  71         int probed_irq;
  72
  73         int region_size;
  74         int have_region;
  75
  76         struct miscdevice miscdev;
  77         struct list_head list;
  78         int locality;
  79         unsigned long timeout_a, timeout_b, timeout_c, timeout_d; /* jiffies */
  80         bool timeout_adjusted;
  81         unsigned long duration[3]; /* jiffies */
  82         bool duration_adjusted;
  83         void *priv;
  84
  85         wait_queue_head_t read_queue;
  86         wait_queue_head_t int_queue;
  87
  88         u16 manufacturer_id;
  89 };
  90
  91 #define TPM_VPRIV(c)    (c)->vendor.priv
  92
  93 #define TPM_VID_INTEL    0x8086
  94 #define TPM_VID_WINBOND  0x1050
  95 #define TPM_VID_STM      0x104A
  96
  97 struct tpm_chip {
  98         struct device *dev;     /* Device stuff */
  99         const struct tpm_class_ops *ops;
 100
 101         int dev_num;            /* /dev/tpm# */
 102         char devname[7];
 103         unsigned long is_open;  /* only one allowed */
 104         int time_expired;
 105
 106         struct mutex tpm_mutex; /* tpm is processing */
 107
 108         struct tpm_vendor_specific vendor;
 109
 110         struct dentry **bios_dir;
 111
 112         struct list_head list;
 113         void (*release) (struct device *);
 114 };
 115
 116 #define to_tpm_chip(n) container_of(n, struct tpm_chip, vendor)
 117
 118 static inline void tpm_chip_put(struct tpm_chip *chip)
 119 {
 120         module_put(chip->dev->driver->owner);
 121 }
 122
 123 static inline int tpm_read_index(int base, int index)
 124 {
 125         outb(index, base);
 126         return inb(base+1) & 0xFF;
 127 }
 128
 129 static inline void tpm_write_index(int base, int index, int value)
 130 {
 131         outb(index, base);
 132         outb(value & 0xFF, base+1);
 133 }
 134 struct tpm_input_header {
 135         __be16  tag;
 136         __be32  length;
 137         __be32  ordinal;
 138 } __packed;
 139
 140 struct tpm_output_header {
 141         __be16  tag;
 142         __be32  length;
 143         __be32  return_code;
 144 } __packed;
 145
 146 #define TPM_TAG_RQU_COMMAND cpu_to_be16(193)
 147
 148 struct  stclear_flags_t {
 149         __be16  tag;
 150         u8      deactivated;
 151         u8      disableForceClear;
 152         u8      physicalPresence;
 153         u8      physicalPresenceLock;
 154         u8      bGlobalLock;
 155 } __packed;
 156
 157 struct  tpm_version_t {
 158         u8      Major;
 159         u8      Minor;
 160         u8      revMajor;
 161         u8      revMinor;
 162 } __packed;
 163
 164 struct  tpm_version_1_2_t {
 165         __be16  tag;
 166         u8      Major;
 167         u8      Minor;
 168         u8      revMajor;
 169         u8      revMinor;
 170 } __packed;
 171
 172 struct  timeout_t {
 173         __be32  a;
 174         __be32  b;
 175         __be32  c;
 176         __be32  d;
 177 } __packed;
 178
 179 struct duration_t {
 180         __be32  tpm_short;
 181         __be32  tpm_medium;
 182         __be32  tpm_long;
 183 } __packed;
 184
 185 struct permanent_flags_t {
 186         __be16  tag;
 187         u8      disable;
 188         u8      ownership;
 189         u8      deactivated;
 190         u8      readPubek;
 191         u8      disableOwnerClear;
 192         u8      allowMaintenance;
 193         u8      physicalPresenceLifetimeLock;
 194         u8      physicalPresenceHWEnable;
 195         u8      physicalPresenceCMDEnable;
 196         u8      CEKPUsed;
 197         u8      TPMpost;
 198         u8      TPMpostLock;
 199         u8      FIPS;
 200         u8      operator;
 201         u8      enableRevokeEK;
 202         u8      nvLocked;
 203         u8      readSRKPub;
 204         u8      tpmEstablished;
 205         u8      maintenanceDone;
 206         u8      disableFullDALogicInfo;
 207 } __packed;
 208
 209 typedef union {
 210         struct  permanent_flags_t perm_flags;
 211         struct  stclear_flags_t stclear_flags;
 212         bool    owned;
 213         __be32  num_pcrs;
 214         struct  tpm_version_t   tpm_version;
 215         struct  tpm_version_1_2_t tpm_version_1_2;
 216         __be32  manufacturer_id;
 217         struct timeout_t  timeout;
 218         struct duration_t duration;
 219 } cap_t;
 220
 221 enum tpm_capabilities {
 222         TPM_CAP_FLAG = cpu_to_be32(4),
 223         TPM_CAP_PROP = cpu_to_be32(5),
 224         CAP_VERSION_1_1 = cpu_to_be32(0x06),
 225         CAP_VERSION_1_2 = cpu_to_be32(0x1A)
 226 };
 227
 228 enum tpm_sub_capabilities {
 229         TPM_CAP_PROP_PCR = cpu_to_be32(0x101),
 230         TPM_CAP_PROP_MANUFACTURER = cpu_to_be32(0x103),
 231         TPM_CAP_FLAG_PERM = cpu_to_be32(0x108),
 232         TPM_CAP_FLAG_VOL = cpu_to_be32(0x109),
 233         TPM_CAP_PROP_OWNER = cpu_to_be32(0x111),
 234         TPM_CAP_PROP_TIS_TIMEOUT = cpu_to_be32(0x115),
 235         TPM_CAP_PROP_TIS_DURATION = cpu_to_be32(0x120),
 236
 237 };
 238
 239 struct  tpm_getcap_params_in {
 240         __be32  cap;
 241         __be32  subcap_size;
 242         __be32  subcap;
 243 } __packed;
 244
 245 struct  tpm_getcap_params_out {
 246         __be32  cap_size;
 247         cap_t   cap;
 248 } __packed;
 249
 250 struct  tpm_readpubek_params_out {
 251         u8      algorithm[4];
 252         u8      encscheme[2];
 253         u8      sigscheme[2];
 254         __be32  paramsize;
 255         u8      parameters[12]; /*assuming RSA*/
 256         __be32  keysize;
 257         u8      modulus[256];
 258         u8      checksum[20];
 259 } __packed;
 260
 261 typedef union {
 262         struct  tpm_input_header in;
 263         struct  tpm_output_header out;
 264 } tpm_cmd_header;
 265
 266 struct tpm_pcrread_out {
 267         u8      pcr_result[TPM_DIGEST_SIZE];
 268 } __packed;
 269
 270 struct tpm_pcrread_in {
 271         __be32  pcr_idx;
 272 } __packed;
 273
 274 struct tpm_pcrextend_in {
 275         __be32  pcr_idx;
 276         u8      hash[TPM_DIGEST_SIZE];
 277 } __packed;
 278
 279 /* 128 bytes is an arbitrary cap. This could be as large as TPM_BUFSIZE - 18
 280  * bytes, but 128 is still a relatively large number of random bytes and
 281  * anything much bigger causes users of struct tpm_cmd_t to start getting
 282  * compiler warnings about stack frame size. */
 283 #define TPM_MAX_RNG_DATA        128
 284
 285 struct tpm_getrandom_out {
 286         __be32 rng_data_len;
 287         u8     rng_data[TPM_MAX_RNG_DATA];
 288 } __packed;
 289
 290 struct tpm_getrandom_in {
 291         __be32 num_bytes;
 292 } __packed;
 293
 294 struct tpm_startup_in {
 295         __be16  startup_type;
 296 } __packed;
 297
 298 typedef union {
 299         struct  tpm_getcap_params_out getcap_out;
 300         struct  tpm_readpubek_params_out readpubek_out;
 301         u8      readpubek_out_buffer[sizeof(struct tpm_readpubek_params_out)];
 302         struct  tpm_getcap_params_in getcap_in;
 303         struct  tpm_pcrread_in  pcrread_in;
 304         struct  tpm_pcrread_out pcrread_out;
 305         struct  tpm_pcrextend_in pcrextend_in;
 306         struct  tpm_getrandom_in getrandom_in;
 307         struct  tpm_getrandom_out getrandom_out;
 308         struct tpm_startup_in startup_in;
 309 } tpm_cmd_params;
 310
 311 struct tpm_cmd_t {
 312         tpm_cmd_header  header;
 313         tpm_cmd_params  params;
 314 } __packed;
 315
 316 ssize_t tpm_getcap(struct device *, __be32, cap_t *, const char *);
 317 ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
 318                      size_t bufsiz);
 319 ssize_t tpm_transmit_cmd(struct tpm_chip *chip, void *cmd, int len,
 320                          const char *desc);
 321 extern int tpm_get_timeouts(struct tpm_chip *);
 322 extern void tpm_gen_interrupt(struct tpm_chip *);
 323 extern int tpm_do_selftest(struct tpm_chip *);
 324 extern unsigned long tpm_calc_ordinal_duration(struct tpm_chip *, u32);
 325 extern struct tpm_chip* tpm_register_hardware(struct device *,
 326                                               const struct tpm_class_ops *ops);
 327 extern void tpm_dev_vendor_release(struct tpm_chip *);
 328 extern void tpm_remove_hardware(struct device *);
 329 extern int tpm_pm_suspend(struct device *);
 330 extern int tpm_pm_resume(struct device *);
 331 extern int wait_for_tpm_stat(struct tpm_chip *, u8, unsigned long,
 332                              wait_queue_head_t *, bool);
 333
 334 int tpm_dev_add_device(struct tpm_chip *chip);
 335 void tpm_dev_del_device(struct tpm_chip *chip);
 336 int tpm_sysfs_add_device(struct tpm_chip *chip);
 337 void tpm_sysfs_del_device(struct tpm_chip *chip);
 338
 339 int tpm_pcr_read_dev(struct tpm_chip *chip, int pcr_idx, u8 *res_buf);
 340
 341 #ifdef CONFIG_ACPI
 342 extern int tpm_add_ppi(struct kobject *);
 343 extern void tpm_remove_ppi(struct kobject *);
 344 #else
 345 static inline int tpm_add_ppi(struct kobject *parent)
 346 {
 347         return 0;
 348 }
 349
 350 static inline void tpm_remove_ppi(struct kobject *parent)
 351 {
 352 }
 353 #endif