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_timeout {
  32         TPM_TIMEOUT = 5,        /* msecs */
  33 };
  34
  35 /* TPM addresses */
  36 enum tpm_addr {
  37         TPM_SUPERIO_ADDR = 0x2E,
  38         TPM_ADDR = 0x4E,
  39 };
  40
  41 extern ssize_t tpm_show_pubek(struct device *, struct device_attribute *attr,
  42                                 char *);
  43 extern ssize_t tpm_show_pcrs(struct device *, struct device_attribute *attr,
  44                                 char *);
  45 extern ssize_t tpm_show_caps(struct device *, struct device_attribute *attr,
  46                                 char *);
  47 extern ssize_t tpm_show_caps_1_2(struct device *, struct device_attribute *attr,
  48                                 char *);
  49 extern ssize_t tpm_store_cancel(struct device *, struct device_attribute *attr,
  50                                 const char *, size_t);
  51 extern ssize_t tpm_show_enabled(struct device *, struct device_attribute *attr,
  52                                 char *);
  53 extern ssize_t tpm_show_active(struct device *, struct device_attribute *attr,
  54                                 char *);
  55 extern ssize_t tpm_show_owned(struct device *, struct device_attribute *attr,
  56                                 char *);
  57 extern ssize_t tpm_show_temp_deactivated(struct device *,
  58                                          struct device_attribute *attr, char *);
  59
  60 struct tpm_chip;
  61
  62 struct tpm_vendor_specific {
  63         const u8 req_complete_mask;
  64         const u8 req_complete_val;
  65         const u8 req_canceled;
  66         void __iomem *iobase;           /* ioremapped address */
  67         unsigned long base;             /* TPM base address */
  68
  69         int irq;
  70
  71         int region_size;
  72         int have_region;
  73
  74         int (*recv) (struct tpm_chip *, u8 *, size_t);
  75         int (*send) (struct tpm_chip *, u8 *, size_t);
  76         void (*cancel) (struct tpm_chip *);
  77         u8 (*status) (struct tpm_chip *);
  78         void (*release) (struct device *);
  79         struct miscdevice miscdev;
  80         struct attribute_group *attr_group;
  81         struct list_head list;
  82         int locality;
  83         unsigned long timeout_a, timeout_b, timeout_c, timeout_d; /* jiffies */
  84         unsigned long duration[3]; /* jiffies */
  85
  86         wait_queue_head_t read_queue;
  87         wait_queue_head_t int_queue;
  88 };
  89
  90 struct tpm_chip {
  91         struct device *dev;     /* Device stuff */
  92
  93         int dev_num;            /* /dev/tpm# */
  94         unsigned long is_open;  /* only one allowed */
  95         int time_expired;
  96
  97         /* Data passed to and from the tpm via the read/write calls */
  98         u8 *data_buffer;
  99         atomic_t data_pending;
 100         struct mutex buffer_mutex;
 101
 102         struct timer_list user_read_timer;      /* user needs to claim result */
 103         struct work_struct work;
 104         struct mutex tpm_mutex; /* tpm is processing */
 105
 106         struct tpm_vendor_specific vendor;
 107
 108         struct dentry **bios_dir;
 109
 110         struct list_head list;
 111         void (*release) (struct device *);
 112 };
 113
 114 #define to_tpm_chip(n) container_of(n, struct tpm_chip, vendor)
 115
 116 static inline int tpm_read_index(int base, int index)
 117 {
 118         outb(index, base);
 119         return inb(base+1) & 0xFF;
 120 }
 121
 122 static inline void tpm_write_index(int base, int index, int value)
 123 {
 124         outb(index, base);
 125         outb(value & 0xFF, base+1);
 126 }
 127 struct tpm_input_header {
 128         __be16  tag;
 129         __be32  length;
 130         __be32  ordinal;
 131 }__attribute__((packed));
 132
 133 struct tpm_output_header {
 134         __be16  tag;
 135         __be32  length;
 136         __be32  return_code;
 137 }__attribute__((packed));
 138
 139 struct  stclear_flags_t {
 140         __be16  tag;
 141         u8      deactivated;
 142         u8      disableForceClear;
 143         u8      physicalPresence;
 144         u8      physicalPresenceLock;
 145         u8      bGlobalLock;
 146 }__attribute__((packed));
 147
 148 struct  tpm_version_t {
 149         u8      Major;
 150         u8      Minor;
 151         u8      revMajor;
 152         u8      revMinor;
 153 }__attribute__((packed));
 154
 155 struct  tpm_version_1_2_t {
 156         __be16  tag;
 157         u8      Major;
 158         u8      Minor;
 159         u8      revMajor;
 160         u8      revMinor;
 161 }__attribute__((packed));
 162
 163 struct  timeout_t {
 164         __be32  a;
 165         __be32  b;
 166         __be32  c;
 167         __be32  d;
 168 }__attribute__((packed));
 169
 170 struct duration_t {
 171         __be32  tpm_short;
 172         __be32  tpm_medium;
 173         __be32  tpm_long;
 174 }__attribute__((packed));
 175
 176 struct permanent_flags_t {
 177         __be16  tag;
 178         u8      disable;
 179         u8      ownership;
 180         u8      deactivated;
 181         u8      readPubek;
 182         u8      disableOwnerClear;
 183         u8      allowMaintenance;
 184         u8      physicalPresenceLifetimeLock;
 185         u8      physicalPresenceHWEnable;
 186         u8      physicalPresenceCMDEnable;
 187         u8      CEKPUsed;
 188         u8      TPMpost;
 189         u8      TPMpostLock;
 190         u8      FIPS;
 191         u8      operator;
 192         u8      enableRevokeEK;
 193         u8      nvLocked;
 194         u8      readSRKPub;
 195         u8      tpmEstablished;
 196         u8      maintenanceDone;
 197         u8      disableFullDALogicInfo;
 198 }__attribute__((packed));
 199
 200 typedef union {
 201         struct  permanent_flags_t perm_flags;
 202         struct  stclear_flags_t stclear_flags;
 203         bool    owned;
 204         __be32  num_pcrs;
 205         struct  tpm_version_t   tpm_version;
 206         struct  tpm_version_1_2_t tpm_version_1_2;
 207         __be32  manufacturer_id;
 208         struct timeout_t  timeout;
 209         struct duration_t duration;
 210 } cap_t;
 211
 212 struct  tpm_getcap_params_in {
 213         __be32  cap;
 214         __be32  subcap_size;
 215         __be32  subcap;
 216 }__attribute__((packed));
 217
 218 struct  tpm_getcap_params_out {
 219         __be32  cap_size;
 220         cap_t   cap;
 221 }__attribute__((packed));
 222
 223 struct  tpm_readpubek_params_out {
 224         u8      algorithm[4];
 225         u8      encscheme[2];
 226         u8      sigscheme[2];
 227         u8      parameters[12]; /*assuming RSA*/
 228         __be32  keysize;
 229         u8      modulus[256];
 230         u8      checksum[20];
 231 }__attribute__((packed));
 232
 233 typedef union {
 234         struct  tpm_input_header in;
 235         struct  tpm_output_header out;
 236 } tpm_cmd_header;
 237
 238 #define TPM_DIGEST_SIZE 20
 239 struct tpm_pcrread_out {
 240         u8      pcr_result[TPM_DIGEST_SIZE];
 241 }__attribute__((packed));
 242
 243 struct tpm_pcrread_in {
 244         __be32  pcr_idx;
 245 }__attribute__((packed));
 246
 247 struct tpm_pcrextend_in {
 248         __be32  pcr_idx;
 249         u8      hash[TPM_DIGEST_SIZE];
 250 }__attribute__((packed));
 251
 252 typedef union {
 253         struct  tpm_getcap_params_out getcap_out;
 254         struct  tpm_readpubek_params_out readpubek_out;
 255         u8      readpubek_out_buffer[sizeof(struct tpm_readpubek_params_out)];
 256         struct  tpm_getcap_params_in getcap_in;
 257         struct  tpm_pcrread_in  pcrread_in;
 258         struct  tpm_pcrread_out pcrread_out;
 259         struct  tpm_pcrextend_in pcrextend_in;
 260 } tpm_cmd_params;
 261
 262 struct tpm_cmd_t {
 263         tpm_cmd_header  header;
 264         tpm_cmd_params  params;
 265 }__attribute__((packed));
 266
 267 ssize_t tpm_getcap(struct device *, __be32, cap_t *, const char *);
 268
 269 extern void tpm_get_timeouts(struct tpm_chip *);
 270 extern void tpm_gen_interrupt(struct tpm_chip *);
 271 extern void tpm_continue_selftest(struct tpm_chip *);
 272 extern unsigned long tpm_calc_ordinal_duration(struct tpm_chip *, u32);
 273 extern struct tpm_chip* tpm_register_hardware(struct device *,
 274                                  const struct tpm_vendor_specific *);
 275 extern int tpm_open(struct inode *, struct file *);
 276 extern int tpm_release(struct inode *, struct file *);
 277 extern void tpm_dev_vendor_release(struct tpm_chip *);
 278 extern ssize_t tpm_write(struct file *, const char __user *, size_t,
 279                          loff_t *);
 280 extern ssize_t tpm_read(struct file *, char __user *, size_t, loff_t *);
 281 extern void tpm_remove_hardware(struct device *);
 282 extern int tpm_pm_suspend(struct device *, pm_message_t);
 283 extern int tpm_pm_resume(struct device *);
 284
 285 #ifdef CONFIG_ACPI
 286 extern struct dentry ** tpm_bios_log_setup(char *);
 287 extern void tpm_bios_log_teardown(struct dentry **);
 288 #else
 289 static inline struct dentry ** tpm_bios_log_setup(char *name)
 290 {
 291         return NULL;
 292 }
 293 static inline void tpm_bios_log_teardown(struct dentry **dir)
 294 {
 295 }
 296 #endif