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         u8 req_complete_mask;
  68         u8 req_complete_val;
  69         bool (*req_canceled)(struct tpm_chip *chip, u8 status);
  70         void __iomem *iobase;           /* ioremapped address */
  71         unsigned long base;             /* TPM base address */
  72
  73         int irq;
  74         int probed_irq;
  75
  76         int region_size;
  77         int have_region;
  78
  79         int (*recv) (struct tpm_chip *, u8 *, size_t);
  80         int (*send) (struct tpm_chip *, u8 *, size_t);
  81         void (*cancel) (struct tpm_chip *);
  82         u8 (*status) (struct tpm_chip *);
  83         void (*release) (struct device *);
  84         struct miscdevice miscdev;
  85         struct list_head list;
  86         int locality;
  87         unsigned long timeout_a, timeout_b, timeout_c, timeout_d; /* jiffies */
  88         bool timeout_adjusted;
  89         unsigned long duration[3]; /* jiffies */
  90         bool duration_adjusted;
  91         void *priv;
  92
  93         wait_queue_head_t read_queue;
  94         wait_queue_head_t int_queue;
  95
  96         u16 manufacturer_id;
  97 };
  98
  99 #define TPM_VPRIV(c)    (c)->vendor.priv
 100
 101 #define TPM_VID_INTEL    0x8086
 102 #define TPM_VID_WINBOND  0x1050
 103 #define TPM_VID_STM      0x104A
 104
 105 struct tpm_chip {
 106         struct device *dev;     /* Device stuff */
 107
 108         int dev_num;            /* /dev/tpm# */
 109         char devname[7];
 110         unsigned long is_open;  /* only one allowed */
 111         int time_expired;
 112
 113         /* Data passed to and from the tpm via the read/write calls */
 114         u8 *data_buffer;
 115         atomic_t data_pending;
 116         struct mutex buffer_mutex;
 117
 118         struct timer_list user_read_timer;      /* user needs to claim result */
 119         struct work_struct work;
 120         struct mutex tpm_mutex; /* tpm is processing */
 121
 122         struct tpm_vendor_specific vendor;
 123
 124         struct dentry **bios_dir;
 125
 126         struct list_head list;
 127         void (*release) (struct device *);
 128 };
 129
 130 #define to_tpm_chip(n) container_of(n, struct tpm_chip, vendor)
 131
 132 static inline void tpm_chip_put(struct tpm_chip *chip)
 133 {
 134         module_put(chip->dev->driver->owner);
 135 }
 136
 137 static inline int tpm_read_index(int base, int index)
 138 {
 139         outb(index, base);
 140         return inb(base+1) & 0xFF;
 141 }
 142
 143 static inline void tpm_write_index(int base, int index, int value)
 144 {
 145         outb(index, base);
 146         outb(value & 0xFF, base+1);
 147 }
 148 struct tpm_input_header {
 149         __be16  tag;
 150         __be32  length;
 151         __be32  ordinal;
 152 } __packed;
 153
 154 struct tpm_output_header {
 155         __be16  tag;
 156         __be32  length;
 157         __be32  return_code;
 158 } __packed;
 159
 160 #define TPM_TAG_RQU_COMMAND cpu_to_be16(193)
 161
 162 struct  stclear_flags_t {
 163         __be16  tag;
 164         u8      deactivated;
 165         u8      disableForceClear;
 166         u8      physicalPresence;
 167         u8      physicalPresenceLock;
 168         u8      bGlobalLock;
 169 } __packed;
 170
 171 struct  tpm_version_t {
 172         u8      Major;
 173         u8      Minor;
 174         u8      revMajor;
 175         u8      revMinor;
 176 } __packed;
 177
 178 struct  tpm_version_1_2_t {
 179         __be16  tag;
 180         u8      Major;
 181         u8      Minor;
 182         u8      revMajor;
 183         u8      revMinor;
 184 } __packed;
 185
 186 struct  timeout_t {
 187         __be32  a;
 188         __be32  b;
 189         __be32  c;
 190         __be32  d;
 191 } __packed;
 192
 193 struct duration_t {
 194         __be32  tpm_short;
 195         __be32  tpm_medium;
 196         __be32  tpm_long;
 197 } __packed;
 198
 199 struct permanent_flags_t {
 200         __be16  tag;
 201         u8      disable;
 202         u8      ownership;
 203         u8      deactivated;
 204         u8      readPubek;
 205         u8      disableOwnerClear;
 206         u8      allowMaintenance;
 207         u8      physicalPresenceLifetimeLock;
 208         u8      physicalPresenceHWEnable;
 209         u8      physicalPresenceCMDEnable;
 210         u8      CEKPUsed;
 211         u8      TPMpost;
 212         u8      TPMpostLock;
 213         u8      FIPS;
 214         u8      operator;
 215         u8      enableRevokeEK;
 216         u8      nvLocked;
 217         u8      readSRKPub;
 218         u8      tpmEstablished;
 219         u8      maintenanceDone;
 220         u8      disableFullDALogicInfo;
 221 } __packed;
 222
 223 typedef union {
 224         struct  permanent_flags_t perm_flags;
 225         struct  stclear_flags_t stclear_flags;
 226         bool    owned;
 227         __be32  num_pcrs;
 228         struct  tpm_version_t   tpm_version;
 229         struct  tpm_version_1_2_t tpm_version_1_2;
 230         __be32  manufacturer_id;
 231         struct timeout_t  timeout;
 232         struct duration_t duration;
 233 } cap_t;
 234
 235 enum tpm_capabilities {
 236         TPM_CAP_FLAG = cpu_to_be32(4),
 237         TPM_CAP_PROP = cpu_to_be32(5),
 238         CAP_VERSION_1_1 = cpu_to_be32(0x06),
 239         CAP_VERSION_1_2 = cpu_to_be32(0x1A)
 240 };
 241
 242 enum tpm_sub_capabilities {
 243         TPM_CAP_PROP_PCR = cpu_to_be32(0x101),
 244         TPM_CAP_PROP_MANUFACTURER = cpu_to_be32(0x103),
 245         TPM_CAP_FLAG_PERM = cpu_to_be32(0x108),
 246         TPM_CAP_FLAG_VOL = cpu_to_be32(0x109),
 247         TPM_CAP_PROP_OWNER = cpu_to_be32(0x111),
 248         TPM_CAP_PROP_TIS_TIMEOUT = cpu_to_be32(0x115),
 249         TPM_CAP_PROP_TIS_DURATION = cpu_to_be32(0x120),
 250
 251 };
 252
 253 struct  tpm_getcap_params_in {
 254         __be32  cap;
 255         __be32  subcap_size;
 256         __be32  subcap;
 257 } __packed;
 258
 259 struct  tpm_getcap_params_out {
 260         __be32  cap_size;
 261         cap_t   cap;
 262 } __packed;
 263
 264 struct  tpm_readpubek_params_out {
 265         u8      algorithm[4];
 266         u8      encscheme[2];
 267         u8      sigscheme[2];
 268         __be32  paramsize;
 269         u8      parameters[12]; /*assuming RSA*/
 270         __be32  keysize;
 271         u8      modulus[256];
 272         u8      checksum[20];
 273 } __packed;
 274
 275 typedef union {
 276         struct  tpm_input_header in;
 277         struct  tpm_output_header out;
 278 } tpm_cmd_header;
 279
 280 struct tpm_pcrread_out {
 281         u8      pcr_result[TPM_DIGEST_SIZE];
 282 } __packed;
 283
 284 struct tpm_pcrread_in {
 285         __be32  pcr_idx;
 286 } __packed;
 287
 288 struct tpm_pcrextend_in {
 289         __be32  pcr_idx;
 290         u8      hash[TPM_DIGEST_SIZE];
 291 } __packed;
 292
 293 /* 128 bytes is an arbitrary cap. This could be as large as TPM_BUFSIZE - 18
 294  * bytes, but 128 is still a relatively large number of random bytes and
 295  * anything much bigger causes users of struct tpm_cmd_t to start getting
 296  * compiler warnings about stack frame size. */
 297 #define TPM_MAX_RNG_DATA        128
 298
 299 struct tpm_getrandom_out {
 300         __be32 rng_data_len;
 301         u8     rng_data[TPM_MAX_RNG_DATA];
 302 } __packed;
 303
 304 struct tpm_getrandom_in {
 305         __be32 num_bytes;
 306 } __packed;
 307
 308 struct tpm_startup_in {
 309         __be16  startup_type;
 310 } __packed;
 311
 312 typedef union {
 313         struct  tpm_getcap_params_out getcap_out;
 314         struct  tpm_readpubek_params_out readpubek_out;
 315         u8      readpubek_out_buffer[sizeof(struct tpm_readpubek_params_out)];
 316         struct  tpm_getcap_params_in getcap_in;
 317         struct  tpm_pcrread_in  pcrread_in;
 318         struct  tpm_pcrread_out pcrread_out;
 319         struct  tpm_pcrextend_in pcrextend_in;
 320         struct  tpm_getrandom_in getrandom_in;
 321         struct  tpm_getrandom_out getrandom_out;
 322         struct tpm_startup_in startup_in;
 323 } tpm_cmd_params;
 324
 325 struct tpm_cmd_t {
 326         tpm_cmd_header  header;
 327         tpm_cmd_params  params;
 328 } __packed;
 329
 330 ssize_t tpm_getcap(struct device *, __be32, cap_t *, const char *);
 331
 332 ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
 333                      size_t bufsiz);
 334 extern int tpm_get_timeouts(struct tpm_chip *);
 335 extern void tpm_gen_interrupt(struct tpm_chip *);
 336 extern int tpm_do_selftest(struct tpm_chip *);
 337 extern unsigned long tpm_calc_ordinal_duration(struct tpm_chip *, u32);
 338 extern struct tpm_chip* tpm_register_hardware(struct device *,
 339                                               const struct tpm_class_ops *ops);
 340 extern void tpm_dev_vendor_release(struct tpm_chip *);
 341 extern void tpm_remove_hardware(struct device *);
 342 extern int tpm_pm_suspend(struct device *);
 343 extern int tpm_pm_resume(struct device *);
 344 extern int wait_for_tpm_stat(struct tpm_chip *, u8, unsigned long,
 345                              wait_queue_head_t *, bool);
 346
 347 int tpm_dev_add_device(struct tpm_chip *chip);
 348 void tpm_dev_del_device(struct tpm_chip *chip);
 349 int tpm_sysfs_add_device(struct tpm_chip *chip);
 350 void tpm_sysfs_del_device(struct tpm_chip *chip);
 351
 352 int tpm_pcr_read_dev(struct tpm_chip *chip, int pcr_idx, u8 *res_buf);
 353
 354 #ifdef CONFIG_ACPI
 355 extern int tpm_add_ppi(struct kobject *);
 356 extern void tpm_remove_ppi(struct kobject *);
 357 #else
 358 static inline int tpm_add_ppi(struct kobject *parent)
 359 {
 360         return 0;
 361 }
 362
 363 static inline void tpm_remove_ppi(struct kobject *parent)
 364 {
 365 }
 366 #endif