git.oblomov.eu Git - linux-2.6/blob - drivers/char/tpm/tpm_atmel.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 /* Atmel definitions */
  25 enum tpm_atmel_addr{
  26         TPM_ATML_BASE = 0x400
  27 };
  28
  29 /* write status bits */
  30 enum tpm_atmel_write_status {
  31         ATML_STATUS_ABORT = 0x01,
  32         ATML_STATUS_LASTBYTE = 0x04
  33 };
  34 /* read status bits */
  35 enum tpm_atmel_read_status {
  36         ATML_STATUS_BUSY = 0x01,
  37         ATML_STATUS_DATA_AVAIL = 0x02,
  38         ATML_STATUS_REWRITE = 0x04,
  39         ATML_STATUS_READY = 0x08
  40 };
  41
  42 static int tpm_atml_recv(struct tpm_chip *chip, u8 * buf, size_t count)
  43 {
  44         u8 status, *hdr = buf;
  45         u32 size;
  46         int i;
  47         __be32 *native_size;
  48
  49         /* start reading header */
  50         if (count < 6)
  51                 return -EIO;
  52
  53         for (i = 0; i < 6; i++) {
  54                 status = inb(chip->vendor->base + 1);
  55                 if ((status & ATML_STATUS_DATA_AVAIL) == 0) {
  56                         dev_err(&chip->pci_dev->dev,
  57                                 "error reading header\n");
  58                         return -EIO;
  59                 }
  60                 *buf++ = inb(chip->vendor->base);
  61         }
  62
  63         /* size of the data received */
  64         native_size = (__force __be32 *) (hdr + 2);
  65         size = be32_to_cpu(*native_size);
  66
  67         if (count < size) {
  68                 dev_err(&chip->pci_dev->dev,
  69                         "Recv size(%d) less than available space\n", size);
  70                 for (; i < size; i++) { /* clear the waiting data anyway */
  71                         status = inb(chip->vendor->base + 1);
  72                         if ((status & ATML_STATUS_DATA_AVAIL) == 0) {
  73                                 dev_err(&chip->pci_dev->dev,
  74                                         "error reading data\n");
  75                                 return -EIO;
  76                         }
  77                 }
  78                 return -EIO;
  79         }
  80
  81         /* read all the data available */
  82         for (; i < size; i++) {
  83                 status = inb(chip->vendor->base + 1);
  84                 if ((status & ATML_STATUS_DATA_AVAIL) == 0) {
  85                         dev_err(&chip->pci_dev->dev,
  86                                 "error reading data\n");
  87                         return -EIO;
  88                 }
  89                 *buf++ = inb(chip->vendor->base);
  90         }
  91
  92         /* make sure data available is gone */
  93         status = inb(chip->vendor->base + 1);
  94         if (status & ATML_STATUS_DATA_AVAIL) {
  95                 dev_err(&chip->pci_dev->dev, "data available is stuck\n");
  96                 return -EIO;
  97         }
  98
  99         return size;
 100 }
 101
 102 static int tpm_atml_send(struct tpm_chip *chip, u8 * buf, size_t count)
 103 {
 104         int i;
 105
 106         dev_dbg(&chip->pci_dev->dev, "tpm_atml_send: ");
 107         for (i = 0; i < count; i++) {
 108                 dev_dbg(&chip->pci_dev->dev, "0x%x(%d) ", buf[i], buf[i]);
 109                 outb(buf[i], chip->vendor->base);
 110         }
 111
 112         return count;
 113 }
 114
 115 static void tpm_atml_cancel(struct tpm_chip *chip)
 116 {
 117         outb(ATML_STATUS_ABORT, chip->vendor->base + 1);
 118 }
 119
 120 static struct file_operations atmel_ops = {
 121         .owner = THIS_MODULE,
 122         .llseek = no_llseek,
 123         .open = tpm_open,
 124         .read = tpm_read,
 125         .write = tpm_write,
 126         .release = tpm_release,
 127 };
 128
 129 static DEVICE_ATTR(pubek, S_IRUGO, tpm_show_pubek, NULL);
 130 static DEVICE_ATTR(pcrs, S_IRUGO, tpm_show_pcrs, NULL);
 131 static DEVICE_ATTR(caps, S_IRUGO, tpm_show_caps, NULL);
 132 static DEVICE_ATTR(cancel, S_IWUSR |S_IWGRP, NULL, tpm_store_cancel);
 133
 134 static struct attribute* atmel_attrs[] = {
 135         &dev_attr_pubek.attr,
 136         &dev_attr_pcrs.attr,
 137         &dev_attr_caps.attr,
 138         &dev_attr_cancel.attr,
 139         0,
 140 };
 141
 142 static struct attribute_group atmel_attr_grp = { .attrs = atmel_attrs };
 143
 144 static struct tpm_vendor_specific tpm_atmel = {
 145         .recv = tpm_atml_recv,
 146         .send = tpm_atml_send,
 147         .cancel = tpm_atml_cancel,
 148         .req_complete_mask = ATML_STATUS_BUSY | ATML_STATUS_DATA_AVAIL,
 149         .req_complete_val = ATML_STATUS_DATA_AVAIL,
 150         .req_canceled = ATML_STATUS_READY,
 151         .base = TPM_ATML_BASE,
 152         .attr_group = &atmel_attr_grp,
 153         .miscdev = { .fops = &atmel_ops, },
 154 };
 155
 156 static int __devinit tpm_atml_init(struct pci_dev *pci_dev,
 157                                    const struct pci_device_id *pci_id)
 158 {
 159         u8 version[4];
 160         int rc = 0;
 161
 162         if (pci_enable_device(pci_dev))
 163                 return -EIO;
 164
 165         if (tpm_lpc_bus_init(pci_dev, TPM_ATML_BASE)) {
 166                 rc = -ENODEV;
 167                 goto out_err;
 168         }
 169
 170         /* verify that it is an Atmel part */
 171         if (tpm_read_index(4) != 'A' || tpm_read_index(5) != 'T'
 172             || tpm_read_index(6) != 'M' || tpm_read_index(7) != 'L') {
 173                 rc = -ENODEV;
 174                 goto out_err;
 175         }
 176
 177         /* query chip for its version number */
 178         if ((version[0] = tpm_read_index(0x00)) != 0xFF) {
 179                 version[1] = tpm_read_index(0x01);
 180                 version[2] = tpm_read_index(0x02);
 181                 version[3] = tpm_read_index(0x03);
 182         } else {
 183                 dev_info(&pci_dev->dev, "version query failed\n");
 184                 rc = -ENODEV;
 185                 goto out_err;
 186         }
 187
 188         if ((rc = tpm_register_hardware(pci_dev, &tpm_atmel)) < 0)
 189                 goto out_err;
 190
 191         dev_info(&pci_dev->dev,
 192                  "Atmel TPM version %d.%d.%d.%d\n", version[0], version[1],
 193                  version[2], version[3]);
 194
 195         return 0;
 196 out_err:
 197         pci_disable_device(pci_dev);
 198         return rc;
 199 }
 200
 201 static struct pci_device_id tpm_pci_tbl[] __devinitdata = {
 202         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801BA_0)},
 203         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_12)},
 204         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_0)},
 205         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_12)},
 206         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801EB_0)},
 207         {PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_8111_LPC)},
 208         {0,}
 209 };
 210
 211 MODULE_DEVICE_TABLE(pci, tpm_pci_tbl);
 212
 213 static struct pci_driver atmel_pci_driver = {
 214         .name = "tpm_atmel",
 215         .id_table = tpm_pci_tbl,
 216         .probe = tpm_atml_init,
 217         .remove = __devexit_p(tpm_remove),
 218         .suspend = tpm_pm_suspend,
 219         .resume = tpm_pm_resume,
 220 };
 221
 222 static int __init init_atmel(void)
 223 {
 224         return pci_register_driver(&atmel_pci_driver);
 225 }
 226
 227 static void __exit cleanup_atmel(void)
 228 {
 229         pci_unregister_driver(&atmel_pci_driver);
 230 }
 231
 232 module_init(init_atmel);
 233 module_exit(cleanup_atmel);
 234
 235 MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
 236 MODULE_DESCRIPTION("TPM Driver");
 237 MODULE_VERSION("2.0");
 238 MODULE_LICENSE("GPL");