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_ATMEL_BASE_ADDR_LO = 0x08,
  27         TPM_ATMEL_BASE_ADDR_HI = 0x09
  28 };
  29
  30 /* write status bits */
  31 enum tpm_atmel_write_status {
  32         ATML_STATUS_ABORT = 0x01,
  33         ATML_STATUS_LASTBYTE = 0x04
  34 };
  35 /* read status bits */
  36 enum tpm_atmel_read_status {
  37         ATML_STATUS_BUSY = 0x01,
  38         ATML_STATUS_DATA_AVAIL = 0x02,
  39         ATML_STATUS_REWRITE = 0x04,
  40         ATML_STATUS_READY = 0x08
  41 };
  42
  43 static int tpm_atml_recv(struct tpm_chip *chip, u8 * buf, size_t count)
  44 {
  45         u8 status, *hdr = buf;
  46         u32 size;
  47         int i;
  48         __be32 *native_size;
  49
  50         /* start reading header */
  51         if (count < 6)
  52                 return -EIO;
  53
  54         for (i = 0; i < 6; i++) {
  55                 status = inb(chip->vendor->base + 1);
  56                 if ((status & ATML_STATUS_DATA_AVAIL) == 0) {
  57                         dev_err(&chip->pci_dev->dev,
  58                                 "error reading header\n");
  59                         return -EIO;
  60                 }
  61                 *buf++ = inb(chip->vendor->base);
  62         }
  63
  64         /* size of the data received */
  65         native_size = (__force __be32 *) (hdr + 2);
  66         size = be32_to_cpu(*native_size);
  67
  68         if (count < size) {
  69                 dev_err(&chip->pci_dev->dev,
  70                         "Recv size(%d) less than available space\n", size);
  71                 for (; i < size; i++) { /* clear the waiting data anyway */
  72                         status = inb(chip->vendor->base + 1);
  73                         if ((status & ATML_STATUS_DATA_AVAIL) == 0) {
  74                                 dev_err(&chip->pci_dev->dev,
  75                                         "error reading data\n");
  76                                 return -EIO;
  77                         }
  78                 }
  79                 return -EIO;
  80         }
  81
  82         /* read all the data available */
  83         for (; i < size; i++) {
  84                 status = inb(chip->vendor->base + 1);
  85                 if ((status & ATML_STATUS_DATA_AVAIL) == 0) {
  86                         dev_err(&chip->pci_dev->dev,
  87                                 "error reading data\n");
  88                         return -EIO;
  89                 }
  90                 *buf++ = inb(chip->vendor->base);
  91         }
  92
  93         /* make sure data available is gone */
  94         status = inb(chip->vendor->base + 1);
  95         if (status & ATML_STATUS_DATA_AVAIL) {
  96                 dev_err(&chip->pci_dev->dev, "data available is stuck\n");
  97                 return -EIO;
  98         }
  99
 100         return size;
 101 }
 102
 103 static int tpm_atml_send(struct tpm_chip *chip, u8 * buf, size_t count)
 104 {
 105         int i;
 106
 107         dev_dbg(&chip->pci_dev->dev, "tpm_atml_send: ");
 108         for (i = 0; i < count; i++) {
 109                 dev_dbg(&chip->pci_dev->dev, "0x%x(%d) ", buf[i], buf[i]);
 110                 outb(buf[i], chip->vendor->base);
 111         }
 112
 113         return count;
 114 }
 115
 116 static void tpm_atml_cancel(struct tpm_chip *chip)
 117 {
 118         outb(ATML_STATUS_ABORT, chip->vendor->base + 1);
 119 }
 120
 121 static struct file_operations atmel_ops = {
 122         .owner = THIS_MODULE,
 123         .llseek = no_llseek,
 124         .open = tpm_open,
 125         .read = tpm_read,
 126         .write = tpm_write,
 127         .release = tpm_release,
 128 };
 129
 130 static DEVICE_ATTR(pubek, S_IRUGO, tpm_show_pubek, NULL);
 131 static DEVICE_ATTR(pcrs, S_IRUGO, tpm_show_pcrs, NULL);
 132 static DEVICE_ATTR(caps, S_IRUGO, tpm_show_caps, NULL);
 133 static DEVICE_ATTR(cancel, S_IWUSR |S_IWGRP, NULL, tpm_store_cancel);
 134
 135 static struct attribute* atmel_attrs[] = {
 136         &dev_attr_pubek.attr,
 137         &dev_attr_pcrs.attr,
 138         &dev_attr_caps.attr,
 139         &dev_attr_cancel.attr,
 140         0,
 141 };
 142
 143 static struct attribute_group atmel_attr_grp = { .attrs = atmel_attrs };
 144
 145 static struct tpm_vendor_specific tpm_atmel = {
 146         .recv = tpm_atml_recv,
 147         .send = tpm_atml_send,
 148         .cancel = tpm_atml_cancel,
 149         .req_complete_mask = ATML_STATUS_BUSY | ATML_STATUS_DATA_AVAIL,
 150         .req_complete_val = ATML_STATUS_DATA_AVAIL,
 151         .req_canceled = ATML_STATUS_READY,
 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         int lo, hi;
 162
 163         if (pci_enable_device(pci_dev))
 164                 return -EIO;
 165
 166         lo = tpm_read_index(TPM_ADDR, TPM_ATMEL_BASE_ADDR_LO);
 167         hi = tpm_read_index(TPM_ADDR, TPM_ATMEL_BASE_ADDR_HI);
 168
 169         tpm_atmel.base = (hi<<8)|lo;
 170         dev_dbg( &pci_dev->dev, "Operating with base: 0x%x\n", tpm_atmel.base);
 171
 172         /* verify that it is an Atmel part */
 173         if (tpm_read_index(TPM_ADDR, 4) != 'A' || tpm_read_index(TPM_ADDR, 5) != 'T'
 174             || tpm_read_index(TPM_ADDR, 6) != 'M' || tpm_read_index(TPM_ADDR, 7) != 'L') {
 175                 rc = -ENODEV;
 176                 goto out_err;
 177         }
 178
 179         /* query chip for its version number */
 180         if ((version[0] = tpm_read_index(TPM_ADDR, 0x00)) != 0xFF) {
 181                 version[1] = tpm_read_index(TPM_ADDR, 0x01);
 182                 version[2] = tpm_read_index(TPM_ADDR, 0x02);
 183                 version[3] = tpm_read_index(TPM_ADDR, 0x03);
 184         } else {
 185                 dev_info(&pci_dev->dev, "version query failed\n");
 186                 rc = -ENODEV;
 187                 goto out_err;
 188         }
 189
 190         if ((rc = tpm_register_hardware(pci_dev, &tpm_atmel)) < 0)
 191                 goto out_err;
 192
 193         dev_info(&pci_dev->dev,
 194                  "Atmel TPM version %d.%d.%d.%d\n", version[0], version[1],
 195                  version[2], version[3]);
 196
 197         return 0;
 198 out_err:
 199         pci_disable_device(pci_dev);
 200         return rc;
 201 }
 202
 203 static struct pci_device_id tpm_pci_tbl[] __devinitdata = {
 204         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801BA_0)},
 205         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_12)},
 206         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_0)},
 207         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_12)},
 208         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801EB_0)},
 209         {PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_8111_LPC)},
 210         {PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_CSB6LPC)},
 211         {0,}
 212 };
 213
 214 MODULE_DEVICE_TABLE(pci, tpm_pci_tbl);
 215
 216 static struct pci_driver atmel_pci_driver = {
 217         .name = "tpm_atmel",
 218         .id_table = tpm_pci_tbl,
 219         .probe = tpm_atml_init,
 220         .remove = __devexit_p(tpm_remove),
 221         .suspend = tpm_pm_suspend,
 222         .resume = tpm_pm_resume,
 223 };
 224
 225 static int __init init_atmel(void)
 226 {
 227         return pci_register_driver(&atmel_pci_driver);
 228 }
 229
 230 static void __exit cleanup_atmel(void)
 231 {
 232         pci_unregister_driver(&atmel_pci_driver);
 233 }
 234
 235 module_init(init_atmel);
 236 module_exit(cleanup_atmel);
 237
 238 MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
 239 MODULE_DESCRIPTION("TPM Driver");
 240 MODULE_VERSION("2.0");
 241 MODULE_LICENSE("GPL");