tpm-uclass.c 3.1 KB

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  1. // SPDX-License-Identifier: GPL-2.0+
  2. /*
  3. * Copyright (c) 2015 Google, Inc
  4. * Written by Simon Glass <sjg@chromium.org>
  5. */
  6. #include <common.h>
  7. #include <dm.h>
  8. #include <log.h>
  9. #include <linux/delay.h>
  10. #include <linux/unaligned/be_byteshift.h>
  11. #include <tpm-v1.h>
  12. #include <tpm-v2.h>
  13. #include "tpm_internal.h"
  14. int tpm_open(struct udevice *dev)
  15. {
  16. struct tpm_ops *ops = tpm_get_ops(dev);
  17. if (!ops->open)
  18. return -ENOSYS;
  19. return ops->open(dev);
  20. }
  21. int tpm_close(struct udevice *dev)
  22. {
  23. struct tpm_ops *ops = tpm_get_ops(dev);
  24. if (!ops->close)
  25. return -ENOSYS;
  26. return ops->close(dev);
  27. }
  28. int tpm_get_desc(struct udevice *dev, char *buf, int size)
  29. {
  30. struct tpm_ops *ops = tpm_get_ops(dev);
  31. if (!ops->get_desc)
  32. return -ENOSYS;
  33. return ops->get_desc(dev, buf, size);
  34. }
  35. /* Returns max number of milliseconds to wait */
  36. static ulong tpm_tis_i2c_calc_ordinal_duration(struct tpm_chip_priv *priv,
  37. u32 ordinal)
  38. {
  39. int duration_idx = TPM_UNDEFINED;
  40. int duration = 0;
  41. if (ordinal < TPM_MAX_ORDINAL) {
  42. duration_idx = tpm_ordinal_duration[ordinal];
  43. } else if ((ordinal & TPM_PROTECTED_ORDINAL_MASK) <
  44. TPM_MAX_PROTECTED_ORDINAL) {
  45. duration_idx = tpm_protected_ordinal_duration[
  46. ordinal & TPM_PROTECTED_ORDINAL_MASK];
  47. }
  48. if (duration_idx != TPM_UNDEFINED)
  49. duration = priv->duration_ms[duration_idx];
  50. if (duration <= 0)
  51. return 2 * 60 * 1000; /* Two minutes timeout */
  52. else
  53. return duration;
  54. }
  55. int tpm_xfer(struct udevice *dev, const uint8_t *sendbuf, size_t send_size,
  56. uint8_t *recvbuf, size_t *recv_size)
  57. {
  58. struct tpm_chip_priv *priv = dev_get_uclass_priv(dev);
  59. struct tpm_ops *ops = tpm_get_ops(dev);
  60. ulong start, stop;
  61. uint count, ordinal;
  62. int ret, ret2 = 0;
  63. if (ops->xfer)
  64. return ops->xfer(dev, sendbuf, send_size, recvbuf, recv_size);
  65. if (!ops->send || !ops->recv)
  66. return -ENOSYS;
  67. /* switch endianess: big->little */
  68. count = get_unaligned_be32(sendbuf + TPM_CMD_COUNT_BYTE);
  69. ordinal = get_unaligned_be32(sendbuf + TPM_CMD_ORDINAL_BYTE);
  70. if (count == 0) {
  71. debug("no data\n");
  72. return -ENODATA;
  73. }
  74. if (count > send_size) {
  75. debug("invalid count value %x %zx\n", count, send_size);
  76. return -E2BIG;
  77. }
  78. debug("%s: Calling send\n", __func__);
  79. ret = ops->send(dev, sendbuf, send_size);
  80. if (ret < 0)
  81. return ret;
  82. start = get_timer(0);
  83. stop = tpm_tis_i2c_calc_ordinal_duration(priv, ordinal);
  84. do {
  85. ret = ops->recv(dev, priv->buf, sizeof(priv->buf));
  86. if (ret >= 0) {
  87. if (ret > *recv_size)
  88. return -ENOSPC;
  89. memcpy(recvbuf, priv->buf, ret);
  90. *recv_size = ret;
  91. ret = 0;
  92. break;
  93. } else if (ret != -EAGAIN) {
  94. return ret;
  95. }
  96. mdelay(priv->retry_time_ms);
  97. if (get_timer(start) > stop) {
  98. ret = -ETIMEDOUT;
  99. break;
  100. }
  101. } while (ret);
  102. if (ret) {
  103. if (ops->cleanup) {
  104. ret2 = ops->cleanup(dev);
  105. if (ret2)
  106. return log_msg_ret("cleanup", ret2);
  107. }
  108. return log_msg_ret("xfer", ret);
  109. }
  110. return 0;
  111. }
  112. UCLASS_DRIVER(tpm) = {
  113. .id = UCLASS_TPM,
  114. .name = "tpm",
  115. .flags = DM_UC_FLAG_SEQ_ALIAS,
  116. #if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
  117. .post_bind = dm_scan_fdt_dev,
  118. #endif
  119. .per_device_auto_alloc_size = sizeof(struct tpm_chip_priv),
  120. };