drivers/char/tpm/tpm_nsc.c

   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
  22 #include "tpm.h"
  23
  24 /* National definitions */
  25 #define TPM_NSC_BASE                    0x360
  26 #define TPM_NSC_IRQ                     0x07
  27
  28 #define NSC_LDN_INDEX                   0x07
  29 #define NSC_SID_INDEX                   0x20
  30 #define NSC_LDC_INDEX                   0x30
  31 #define NSC_DIO_INDEX                   0x60
  32 #define NSC_CIO_INDEX                   0x62
  33 #define NSC_IRQ_INDEX                   0x70
  34 #define NSC_ITS_INDEX                   0x71
  35
  36 #define NSC_STATUS                      0x01
  37 #define NSC_COMMAND                     0x01
  38 #define NSC_DATA                        0x00
  39
  40 /* status bits */
  41 #define NSC_STATUS_OBF                  0x01    /* output buffer full */
  42 #define NSC_STATUS_IBF                  0x02    /* input buffer full */
  43 #define NSC_STATUS_F0                   0x04    /* F0 */
  44 #define NSC_STATUS_A2                   0x08    /* A2 */
  45 #define NSC_STATUS_RDY                  0x10    /* ready to receive command */
  46 #define NSC_STATUS_IBR                  0x20    /* ready to receive data */
  47
  48 /* command bits */
  49 #define NSC_COMMAND_NORMAL              0x01    /* normal mode */
  50 #define NSC_COMMAND_EOC                 0x03
  51 #define NSC_COMMAND_CANCEL              0x22
  52
  53 /*
  54  * Wait for a certain status to appear
  55  */
  56 static int wait_for_stat(struct tpm_chip *chip, u8 mask, u8 val, u8 * data)
  57 {
  58         int expired = 0;
  59         struct timer_list status_timer =
  60             TIMER_INITIALIZER(tpm_time_expired, jiffies + 10 * HZ,
  61                               (unsigned long) &expired);
  62
  63         /* status immediately available check */
  64         *data = inb(chip->vendor->base + NSC_STATUS);
  65         if ((*data & mask) == val)
  66                 return 0;
  67
  68         /* wait for status */
  69         add_timer(&status_timer);
  70         do {
  71                 set_current_state(TASK_UNINTERRUPTIBLE);
  72                 schedule_timeout(TPM_TIMEOUT);
  73                 *data = inb(chip->vendor->base + 1);
  74                 if ((*data & mask) == val) {
  75                         del_singleshot_timer_sync(&status_timer);
  76                         return 0;
  77                 }
  78         }
  79         while (!expired);
  80
  81         return -EBUSY;
  82 }
  83
  84 static int nsc_wait_for_ready(struct tpm_chip *chip)
  85 {
  86         int status;
  87         int expired = 0;
  88         struct timer_list status_timer =
  89             TIMER_INITIALIZER(tpm_time_expired, jiffies + 100,
  90                               (unsigned long) &expired);
  91
  92         /* status immediately available check */
  93         status = inb(chip->vendor->base + NSC_STATUS);
  94         if (status & NSC_STATUS_OBF)
  95                 status = inb(chip->vendor->base + NSC_DATA);
  96         if (status & NSC_STATUS_RDY)
  97                 return 0;
  98
  99         /* wait for status */
 100         add_timer(&status_timer);
 101         do {
 102                 set_current_state(TASK_UNINTERRUPTIBLE);
 103                 schedule_timeout(TPM_TIMEOUT);
 104                 status = inb(chip->vendor->base + NSC_STATUS);
 105                 if (status & NSC_STATUS_OBF)
 106                         status = inb(chip->vendor->base + NSC_DATA);
 107                 if (status & NSC_STATUS_RDY) {
 108                         del_singleshot_timer_sync(&status_timer);
 109                         return 0;
 110                 }
 111         }
 112         while (!expired);
 113
 114         dev_info(&chip->pci_dev->dev, "wait for ready failed\n");
 115         return -EBUSY;
 116 }
 117
 118
 119 static int tpm_nsc_recv(struct tpm_chip *chip, u8 * buf, size_t count)
 120 {
 121         u8 *buffer = buf;
 122         u8 data, *p;
 123         u32 size;
 124         __be32 *native_size;
 125
 126         if (count < 6)
 127                 return -EIO;
 128
 129         if (wait_for_stat(chip, NSC_STATUS_F0, NSC_STATUS_F0, &data) < 0) {
 130                 dev_err(&chip->pci_dev->dev, "F0 timeout\n");
 131                 return -EIO;
 132         }
 133         if ((data =
 134              inb(chip->vendor->base + NSC_DATA)) != NSC_COMMAND_NORMAL) {
 135                 dev_err(&chip->pci_dev->dev, "not in normal mode (0x%x)\n",
 136                         data);
 137                 return -EIO;
 138         }
 139
 140         /* read the whole packet */
 141         for (p = buffer; p < &buffer[count]; p++) {
 142                 if (wait_for_stat
 143                     (chip, NSC_STATUS_OBF, NSC_STATUS_OBF, &data) < 0) {
 144                         dev_err(&chip->pci_dev->dev,
 145                                 "OBF timeout (while reading data)\n");
 146                         return -EIO;
 147                 }
 148                 if (data & NSC_STATUS_F0)
 149                         break;
 150                 *p = inb(chip->vendor->base + NSC_DATA);
 151         }
 152
 153         if ((data & NSC_STATUS_F0) == 0) {
 154                 dev_err(&chip->pci_dev->dev, "F0 not set\n");
 155                 return -EIO;
 156         }
 157         if ((data = inb(chip->vendor->base + NSC_DATA)) != NSC_COMMAND_EOC) {
 158                 dev_err(&chip->pci_dev->dev,
 159                         "expected end of command(0x%x)\n", data);
 160                 return -EIO;
 161         }
 162
 163         native_size = (__force __be32 *) (buf + 2);
 164         size = be32_to_cpu(*native_size);
 165
 166         if (count < size)
 167                 return -EIO;
 168
 169         return size;
 170 }
 171
 172 static int tpm_nsc_send(struct tpm_chip *chip, u8 * buf, size_t count)
 173 {
 174         u8 data;
 175         int i;
 176
 177         /*
 178          * If we hit the chip with back to back commands it locks up
 179          * and never set IBF. Hitting it with this "hammer" seems to
 180          * fix it. Not sure why this is needed, we followed the flow
 181          * chart in the manual to the letter.
 182          */
 183         outb(NSC_COMMAND_CANCEL, chip->vendor->base + NSC_COMMAND);
 184
 185         if (nsc_wait_for_ready(chip) != 0)
 186                 return -EIO;
 187
 188         if (wait_for_stat(chip, NSC_STATUS_IBF, 0, &data) < 0) {
 189                 dev_err(&chip->pci_dev->dev, "IBF timeout\n");
 190                 return -EIO;
 191         }
 192
 193         outb(NSC_COMMAND_NORMAL, chip->vendor->base + NSC_COMMAND);
 194         if (wait_for_stat(chip, NSC_STATUS_IBR, NSC_STATUS_IBR, &data) < 0) {
 195                 dev_err(&chip->pci_dev->dev, "IBR timeout\n");
 196                 return -EIO;
 197         }
 198
 199         for (i = 0; i < count; i++) {
 200                 if (wait_for_stat(chip, NSC_STATUS_IBF, 0, &data) < 0) {
 201                         dev_err(&chip->pci_dev->dev,
 202                                 "IBF timeout (while writing data)\n");
 203                         return -EIO;
 204                 }
 205                 outb(buf[i], chip->vendor->base + NSC_DATA);
 206         }
 207
 208         if (wait_for_stat(chip, NSC_STATUS_IBF, 0, &data) < 0) {
 209                 dev_err(&chip->pci_dev->dev, "IBF timeout\n");
 210                 return -EIO;
 211         }
 212         outb(NSC_COMMAND_EOC, chip->vendor->base + NSC_COMMAND);
 213
 214         return count;
 215 }
 216
 217 static void tpm_nsc_cancel(struct tpm_chip *chip)
 218 {
 219         outb(NSC_COMMAND_CANCEL, chip->vendor->base + NSC_COMMAND);
 220 }
 221
 222 static struct file_operations nsc_ops = {
 223         .owner = THIS_MODULE,
 224         .llseek = no_llseek,
 225         .open = tpm_open,
 226         .read = tpm_read,
 227         .write = tpm_write,
 228         .release = tpm_release,
 229 };
 230
 231 static struct tpm_vendor_specific tpm_nsc = {
 232         .recv = tpm_nsc_recv,
 233         .send = tpm_nsc_send,
 234         .cancel = tpm_nsc_cancel,
 235         .req_complete_mask = NSC_STATUS_OBF,
 236         .req_complete_val = NSC_STATUS_OBF,
 237         .base = TPM_NSC_BASE,
 238         .miscdev = { .fops = &nsc_ops, },
 239
 240 };
 241
 242 static int __devinit tpm_nsc_init(struct pci_dev *pci_dev,
 243                                   const struct pci_device_id *pci_id)
 244 {
 245         int rc = 0;
 246
 247         if (pci_enable_device(pci_dev))
 248                 return -EIO;
 249
 250         if (tpm_lpc_bus_init(pci_dev, TPM_NSC_BASE)) {
 251                 rc = -ENODEV;
 252                 goto out_err;
 253         }
 254
 255         /* verify that it is a National part (SID) */
 256         if (tpm_read_index(NSC_SID_INDEX) != 0xEF) {
 257                 rc = -ENODEV;
 258                 goto out_err;
 259         }
 260
 261         dev_dbg(&pci_dev->dev, "NSC TPM detected\n");
 262         dev_dbg(&pci_dev->dev,
 263                 "NSC LDN 0x%x, SID 0x%x, SRID 0x%x\n",
 264                 tpm_read_index(0x07), tpm_read_index(0x20),
 265                 tpm_read_index(0x27));
 266         dev_dbg(&pci_dev->dev,
 267                 "NSC SIOCF1 0x%x SIOCF5 0x%x SIOCF6 0x%x SIOCF8 0x%x\n",
 268                 tpm_read_index(0x21), tpm_read_index(0x25),
 269                 tpm_read_index(0x26), tpm_read_index(0x28));
 270         dev_dbg(&pci_dev->dev, "NSC IO Base0 0x%x\n",
 271                 (tpm_read_index(0x60) << 8) | tpm_read_index(0x61));
 272         dev_dbg(&pci_dev->dev, "NSC IO Base1 0x%x\n",
 273                 (tpm_read_index(0x62) << 8) | tpm_read_index(0x63));
 274         dev_dbg(&pci_dev->dev, "NSC Interrupt number and wakeup 0x%x\n",
 275                 tpm_read_index(0x70));
 276         dev_dbg(&pci_dev->dev, "NSC IRQ type select 0x%x\n",
 277                 tpm_read_index(0x71));
 278         dev_dbg(&pci_dev->dev,
 279                 "NSC DMA channel select0 0x%x, select1 0x%x\n",
 280                 tpm_read_index(0x74), tpm_read_index(0x75));
 281         dev_dbg(&pci_dev->dev,
 282                 "NSC Config "
 283                 "0x%x 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x\n",
 284                 tpm_read_index(0xF0), tpm_read_index(0xF1),
 285                 tpm_read_index(0xF2), tpm_read_index(0xF3),
 286                 tpm_read_index(0xF4), tpm_read_index(0xF5),
 287                 tpm_read_index(0xF6), tpm_read_index(0xF7),
 288                 tpm_read_index(0xF8), tpm_read_index(0xF9));
 289
 290         dev_info(&pci_dev->dev,
 291                  "NSC PC21100 TPM revision %d\n",
 292                  tpm_read_index(0x27) & 0x1F);
 293
 294         if (tpm_read_index(NSC_LDC_INDEX) == 0)
 295                 dev_info(&pci_dev->dev, ": NSC TPM not active\n");
 296
 297         /* select PM channel 1 */
 298         tpm_write_index(NSC_LDN_INDEX, 0x12);
 299         tpm_read_index(NSC_LDN_INDEX);
 300
 301         /* disable the DPM module */
 302         tpm_write_index(NSC_LDC_INDEX, 0);
 303         tpm_read_index(NSC_LDC_INDEX);
 304
 305         /* set the data register base addresses */
 306         tpm_write_index(NSC_DIO_INDEX, TPM_NSC_BASE >> 8);
 307         tpm_write_index(NSC_DIO_INDEX + 1, TPM_NSC_BASE);
 308         tpm_read_index(NSC_DIO_INDEX);
 309         tpm_read_index(NSC_DIO_INDEX + 1);
 310
 311         /* set the command register base addresses */
 312         tpm_write_index(NSC_CIO_INDEX, (TPM_NSC_BASE + 1) >> 8);
 313         tpm_write_index(NSC_CIO_INDEX + 1, (TPM_NSC_BASE + 1));
 314         tpm_read_index(NSC_DIO_INDEX);
 315         tpm_read_index(NSC_DIO_INDEX + 1);
 316
 317         /* set the interrupt number to be used for the host interface */
 318         tpm_write_index(NSC_IRQ_INDEX, TPM_NSC_IRQ);
 319         tpm_write_index(NSC_ITS_INDEX, 0x00);
 320         tpm_read_index(NSC_IRQ_INDEX);
 321
 322         /* enable the DPM module */
 323         tpm_write_index(NSC_LDC_INDEX, 0x01);
 324         tpm_read_index(NSC_LDC_INDEX);
 325
 326         if ((rc = tpm_register_hardware(pci_dev, &tpm_nsc)) < 0)
 327                 goto out_err;
 328
 329         return 0;
 330
 331 out_err:
 332         pci_disable_device(pci_dev);
 333         return rc;
 334 }
 335
 336 static struct pci_device_id tpm_pci_tbl[] __devinitdata = {
 337         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801BA_0)},
 338         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_12)},
 339         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_0)},
 340         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_12)},
 341         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801EB_0)},
 342         {PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_8111_LPC)},
 343         {0,}
 344 };
 345
 346 MODULE_DEVICE_TABLE(pci, tpm_pci_tbl);
 347
 348 static struct pci_driver nsc_pci_driver = {
 349         .name = "tpm_nsc",
 350         .id_table = tpm_pci_tbl,
 351         .probe = tpm_nsc_init,
 352         .remove = __devexit_p(tpm_remove),
 353         .suspend = tpm_pm_suspend,
 354         .resume = tpm_pm_resume,
 355 };
 356
 357 static int __init init_nsc(void)
 358 {
 359         return pci_register_driver(&nsc_pci_driver);
 360 }
 361
 362 static void __exit cleanup_nsc(void)
 363 {
 364         pci_unregister_driver(&nsc_pci_driver);
 365 }
 366
 367 module_init(init_nsc);
 368 module_exit(cleanup_nsc);
 369
 370 MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
 371 MODULE_DESCRIPTION("TPM Driver");
 372 MODULE_VERSION("2.0");
 373 MODULE_LICENSE("GPL");