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 enum tpm_nsc_addr {
  26         TPM_NSC_BASE = 0x360,
  27         TPM_NSC_IRQ = 0x07
  28 };
  29
  30 enum tpm_nsc_index {
  31         NSC_LDN_INDEX = 0x07,
  32         NSC_SID_INDEX = 0x20,
  33         NSC_LDC_INDEX = 0x30,
  34         NSC_DIO_INDEX = 0x60,
  35         NSC_CIO_INDEX = 0x62,
  36         NSC_IRQ_INDEX = 0x70,
  37         NSC_ITS_INDEX = 0x71
  38 };
  39
  40 enum tpm_nsc_status_loc {
  41         NSC_STATUS = 0x01,
  42         NSC_COMMAND = 0x01,
  43         NSC_DATA = 0x00
  44 };
  45
  46 /* status bits */
  47 enum tpm_nsc_status{
  48         NSC_STATUS_OBF = 0x01,  /* output buffer full */
  49         NSC_STATUS_IBF = 0x02,  /* input buffer full */
  50         NSC_STATUS_F0 = 0x04,   /* F0 */
  51         NSC_STATUS_A2 = 0x08,   /* A2 */
  52         NSC_STATUS_RDY = 0x10,  /* ready to receive command */
  53         NSC_STATUS_IBR = 0x20   /* ready to receive data */
  54 };
  55 /* command bits */
  56 enum tpm_nsc_cmd_mode {
  57         NSC_COMMAND_NORMAL = 0x01,      /* normal mode */
  58         NSC_COMMAND_EOC = 0x03,
  59         NSC_COMMAND_CANCEL = 0x22
  60 };
  61 /*
  62  * Wait for a certain status to appear
  63  */
  64 static int wait_for_stat(struct tpm_chip *chip, u8 mask, u8 val, u8 * data)
  65 {
  66         unsigned long stop;
  67
  68         /* status immediately available check */
  69         *data = inb(chip->vendor->base + NSC_STATUS);
  70         if ((*data & mask) == val)
  71                 return 0;
  72
  73         /* wait for status */
  74         stop = jiffies + 10 * HZ;
  75         do {
  76                 msleep(TPM_TIMEOUT);
  77                 *data = inb(chip->vendor->base + 1);
  78                 if ((*data & mask) == val)
  79                         return 0;
  80         }
  81         while (time_before(jiffies, stop));
  82
  83         return -EBUSY;
  84 }
  85
  86 static int nsc_wait_for_ready(struct tpm_chip *chip)
  87 {
  88         int status;
  89         unsigned long stop;
  90
  91         /* status immediately available check */
  92         status = inb(chip->vendor->base + NSC_STATUS);
  93         if (status & NSC_STATUS_OBF)
  94                 status = inb(chip->vendor->base + NSC_DATA);
  95         if (status & NSC_STATUS_RDY)
  96                 return 0;
  97
  98         /* wait for status */
  99         stop = jiffies + 100;
 100         do {
 101                 msleep(TPM_TIMEOUT);
 102                 status = inb(chip->vendor->base + NSC_STATUS);
 103                 if (status & NSC_STATUS_OBF)
 104                         status = inb(chip->vendor->base + NSC_DATA);
 105                 if (status & NSC_STATUS_RDY)
 106                         return 0;
 107         }
 108         while (time_before(jiffies, stop));
 109
 110         dev_info(&chip->pci_dev->dev, "wait for ready failed\n");
 111         return -EBUSY;
 112 }
 113
 114
 115 static int tpm_nsc_recv(struct tpm_chip *chip, u8 * buf, size_t count)
 116 {
 117         u8 *buffer = buf;
 118         u8 data, *p;
 119         u32 size;
 120         __be32 *native_size;
 121
 122         if (count < 6)
 123                 return -EIO;
 124
 125         if (wait_for_stat(chip, NSC_STATUS_F0, NSC_STATUS_F0, &data) < 0) {
 126                 dev_err(&chip->pci_dev->dev, "F0 timeout\n");
 127                 return -EIO;
 128         }
 129         if ((data =
 130              inb(chip->vendor->base + NSC_DATA)) != NSC_COMMAND_NORMAL) {
 131                 dev_err(&chip->pci_dev->dev, "not in normal mode (0x%x)\n",
 132                         data);
 133                 return -EIO;
 134         }
 135
 136         /* read the whole packet */
 137         for (p = buffer; p < &buffer[count]; p++) {
 138                 if (wait_for_stat
 139                     (chip, NSC_STATUS_OBF, NSC_STATUS_OBF, &data) < 0) {
 140                         dev_err(&chip->pci_dev->dev,
 141                                 "OBF timeout (while reading data)\n");
 142                         return -EIO;
 143                 }
 144                 if (data & NSC_STATUS_F0)
 145                         break;
 146                 *p = inb(chip->vendor->base + NSC_DATA);
 147         }
 148
 149         if ((data & NSC_STATUS_F0) == 0) {
 150                 dev_err(&chip->pci_dev->dev, "F0 not set\n");
 151                 return -EIO;
 152         }
 153         if ((data = inb(chip->vendor->base + NSC_DATA)) != NSC_COMMAND_EOC) {
 154                 dev_err(&chip->pci_dev->dev,
 155                         "expected end of command(0x%x)\n", data);
 156                 return -EIO;
 157         }
 158
 159         native_size = (__force __be32 *) (buf + 2);
 160         size = be32_to_cpu(*native_size);
 161
 162         if (count < size)
 163                 return -EIO;
 164
 165         return size;
 166 }
 167
 168 static int tpm_nsc_send(struct tpm_chip *chip, u8 * buf, size_t count)
 169 {
 170         u8 data;
 171         int i;
 172
 173         /*
 174          * If we hit the chip with back to back commands it locks up
 175          * and never set IBF. Hitting it with this "hammer" seems to
 176          * fix it. Not sure why this is needed, we followed the flow
 177          * chart in the manual to the letter.
 178          */
 179         outb(NSC_COMMAND_CANCEL, chip->vendor->base + NSC_COMMAND);
 180
 181         if (nsc_wait_for_ready(chip) != 0)
 182                 return -EIO;
 183
 184         if (wait_for_stat(chip, NSC_STATUS_IBF, 0, &data) < 0) {
 185                 dev_err(&chip->pci_dev->dev, "IBF timeout\n");
 186                 return -EIO;
 187         }
 188
 189         outb(NSC_COMMAND_NORMAL, chip->vendor->base + NSC_COMMAND);
 190         if (wait_for_stat(chip, NSC_STATUS_IBR, NSC_STATUS_IBR, &data) < 0) {
 191                 dev_err(&chip->pci_dev->dev, "IBR timeout\n");
 192                 return -EIO;
 193         }
 194
 195         for (i = 0; i < count; i++) {
 196                 if (wait_for_stat(chip, NSC_STATUS_IBF, 0, &data) < 0) {
 197                         dev_err(&chip->pci_dev->dev,
 198                                 "IBF timeout (while writing data)\n");
 199                         return -EIO;
 200                 }
 201                 outb(buf[i], chip->vendor->base + NSC_DATA);
 202         }
 203
 204         if (wait_for_stat(chip, NSC_STATUS_IBF, 0, &data) < 0) {
 205                 dev_err(&chip->pci_dev->dev, "IBF timeout\n");
 206                 return -EIO;
 207         }
 208         outb(NSC_COMMAND_EOC, chip->vendor->base + NSC_COMMAND);
 209
 210         return count;
 211 }
 212
 213 static void tpm_nsc_cancel(struct tpm_chip *chip)
 214 {
 215         outb(NSC_COMMAND_CANCEL, chip->vendor->base + NSC_COMMAND);
 216 }
 217
 218 static struct file_operations nsc_ops = {
 219         .owner = THIS_MODULE,
 220         .llseek = no_llseek,
 221         .open = tpm_open,
 222         .read = tpm_read,
 223         .write = tpm_write,
 224         .release = tpm_release,
 225 };
 226
 227 static DEVICE_ATTR(pubek, S_IRUGO, tpm_show_pubek, NULL);
 228 static DEVICE_ATTR(pcrs, S_IRUGO, tpm_show_pcrs, NULL);
 229 static DEVICE_ATTR(caps, S_IRUGO, tpm_show_caps, NULL);
 230 static DEVICE_ATTR(cancel, S_IWUSR|S_IWGRP, NULL, tpm_store_cancel);
 231
 232 static struct attribute * nsc_attrs[] = {
 233         &dev_attr_pubek.attr,
 234         &dev_attr_pcrs.attr,
 235         &dev_attr_caps.attr,
 236         &dev_attr_cancel.attr,
 237         0,
 238 };
 239
 240 static struct attribute_group nsc_attr_grp = { .attrs = nsc_attrs };
 241
 242 static struct tpm_vendor_specific tpm_nsc = {
 243         .recv = tpm_nsc_recv,
 244         .send = tpm_nsc_send,
 245         .cancel = tpm_nsc_cancel,
 246         .req_complete_mask = NSC_STATUS_OBF,
 247         .req_complete_val = NSC_STATUS_OBF,
 248         .req_canceled = NSC_STATUS_RDY,
 249         .base = TPM_NSC_BASE,
 250         .attr_group = &nsc_attr_grp,
 251         .miscdev = { .fops = &nsc_ops, },
 252 };
 253
 254 static int __devinit tpm_nsc_init(struct pci_dev *pci_dev,
 255                                   const struct pci_device_id *pci_id)
 256 {
 257         int rc = 0;
 258
 259         if (pci_enable_device(pci_dev))
 260                 return -EIO;
 261
 262         if (tpm_lpc_bus_init(pci_dev, TPM_NSC_BASE)) {
 263                 rc = -ENODEV;
 264                 goto out_err;
 265         }
 266
 267         /* verify that it is a National part (SID) */
 268         if (tpm_read_index(NSC_SID_INDEX) != 0xEF) {
 269                 rc = -ENODEV;
 270                 goto out_err;
 271         }
 272
 273         dev_dbg(&pci_dev->dev, "NSC TPM detected\n");
 274         dev_dbg(&pci_dev->dev,
 275                 "NSC LDN 0x%x, SID 0x%x, SRID 0x%x\n",
 276                 tpm_read_index(0x07), tpm_read_index(0x20),
 277                 tpm_read_index(0x27));
 278         dev_dbg(&pci_dev->dev,
 279                 "NSC SIOCF1 0x%x SIOCF5 0x%x SIOCF6 0x%x SIOCF8 0x%x\n",
 280                 tpm_read_index(0x21), tpm_read_index(0x25),
 281                 tpm_read_index(0x26), tpm_read_index(0x28));
 282         dev_dbg(&pci_dev->dev, "NSC IO Base0 0x%x\n",
 283                 (tpm_read_index(0x60) << 8) | tpm_read_index(0x61));
 284         dev_dbg(&pci_dev->dev, "NSC IO Base1 0x%x\n",
 285                 (tpm_read_index(0x62) << 8) | tpm_read_index(0x63));
 286         dev_dbg(&pci_dev->dev, "NSC Interrupt number and wakeup 0x%x\n",
 287                 tpm_read_index(0x70));
 288         dev_dbg(&pci_dev->dev, "NSC IRQ type select 0x%x\n",
 289                 tpm_read_index(0x71));
 290         dev_dbg(&pci_dev->dev,
 291                 "NSC DMA channel select0 0x%x, select1 0x%x\n",
 292                 tpm_read_index(0x74), tpm_read_index(0x75));
 293         dev_dbg(&pci_dev->dev,
 294                 "NSC Config "
 295                 "0x%x 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x\n",
 296                 tpm_read_index(0xF0), tpm_read_index(0xF1),
 297                 tpm_read_index(0xF2), tpm_read_index(0xF3),
 298                 tpm_read_index(0xF4), tpm_read_index(0xF5),
 299                 tpm_read_index(0xF6), tpm_read_index(0xF7),
 300                 tpm_read_index(0xF8), tpm_read_index(0xF9));
 301
 302         dev_info(&pci_dev->dev,
 303                  "NSC PC21100 TPM revision %d\n",
 304                  tpm_read_index(0x27) & 0x1F);
 305
 306         if (tpm_read_index(NSC_LDC_INDEX) == 0)
 307                 dev_info(&pci_dev->dev, ": NSC TPM not active\n");
 308
 309         /* select PM channel 1 */
 310         tpm_write_index(NSC_LDN_INDEX, 0x12);
 311         tpm_read_index(NSC_LDN_INDEX);
 312
 313         /* disable the DPM module */
 314         tpm_write_index(NSC_LDC_INDEX, 0);
 315         tpm_read_index(NSC_LDC_INDEX);
 316
 317         /* set the data register base addresses */
 318         tpm_write_index(NSC_DIO_INDEX, TPM_NSC_BASE >> 8);
 319         tpm_write_index(NSC_DIO_INDEX + 1, TPM_NSC_BASE);
 320         tpm_read_index(NSC_DIO_INDEX);
 321         tpm_read_index(NSC_DIO_INDEX + 1);
 322
 323         /* set the command register base addresses */
 324         tpm_write_index(NSC_CIO_INDEX, (TPM_NSC_BASE + 1) >> 8);
 325         tpm_write_index(NSC_CIO_INDEX + 1, (TPM_NSC_BASE + 1));
 326         tpm_read_index(NSC_DIO_INDEX);
 327         tpm_read_index(NSC_DIO_INDEX + 1);
 328
 329         /* set the interrupt number to be used for the host interface */
 330         tpm_write_index(NSC_IRQ_INDEX, TPM_NSC_IRQ);
 331         tpm_write_index(NSC_ITS_INDEX, 0x00);
 332         tpm_read_index(NSC_IRQ_INDEX);
 333
 334         /* enable the DPM module */
 335         tpm_write_index(NSC_LDC_INDEX, 0x01);
 336         tpm_read_index(NSC_LDC_INDEX);
 337
 338         if ((rc = tpm_register_hardware(pci_dev, &tpm_nsc)) < 0)
 339                 goto out_err;
 340
 341         return 0;
 342
 343 out_err:
 344         pci_disable_device(pci_dev);
 345         return rc;
 346 }
 347
 348 static struct pci_device_id tpm_pci_tbl[] __devinitdata = {
 349         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801BA_0)},
 350         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_12)},
 351         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_0)},
 352         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_12)},
 353         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801EB_0)},
 354         {PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_8111_LPC)},
 355         {0,}
 356 };
 357
 358 MODULE_DEVICE_TABLE(pci, tpm_pci_tbl);
 359
 360 static struct pci_driver nsc_pci_driver = {
 361         .name = "tpm_nsc",
 362         .id_table = tpm_pci_tbl,
 363         .probe = tpm_nsc_init,
 364         .remove = __devexit_p(tpm_remove),
 365         .suspend = tpm_pm_suspend,
 366         .resume = tpm_pm_resume,
 367 };
 368
 369 static int __init init_nsc(void)
 370 {
 371         return pci_register_driver(&nsc_pci_driver);
 372 }
 373
 374 static void __exit cleanup_nsc(void)
 375 {
 376         pci_unregister_driver(&nsc_pci_driver);
 377 }
 378
 379 module_init(init_nsc);
 380 module_exit(cleanup_nsc);
 381
 382 MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
 383 MODULE_DESCRIPTION("TPM Driver");
 384 MODULE_VERSION("2.0");
 385 MODULE_LICENSE("GPL");