git.sur5r.net Git - u-boot/blob - drivers/tpm/tpm-uclass.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (c) 2015 Google, Inc
   4  * Written by Simon Glass <sjg@chromium.org>
   5  */
   6
   7 #include <common.h>
   8 #include <dm.h>
   9 #include <linux/unaligned/be_byteshift.h>
  10 #if defined(CONFIG_TPM_V1)
  11 #include <tpm-v1.h>
  12 #elif defined(CONFIG_TPM_V2)
  13 #include <tpm-v2.h>
  14 #endif
  15 #include "tpm_internal.h"
  16
  17 int tpm_open(struct udevice *dev)
  18 {
  19         struct tpm_ops *ops = tpm_get_ops(dev);
  20
  21         if (!ops->open)
  22                 return -ENOSYS;
  23
  24         return ops->open(dev);
  25 }
  26
  27 int tpm_close(struct udevice *dev)
  28 {
  29         struct tpm_ops *ops = tpm_get_ops(dev);
  30
  31         if (!ops->close)
  32                 return -ENOSYS;
  33
  34         return ops->close(dev);
  35 }
  36
  37 int tpm_get_desc(struct udevice *dev, char *buf, int size)
  38 {
  39         struct tpm_ops *ops = tpm_get_ops(dev);
  40
  41         if (!ops->get_desc)
  42                 return -ENOSYS;
  43
  44         return ops->get_desc(dev, buf, size);
  45 }
  46
  47 /* Returns max number of milliseconds to wait */
  48 static ulong tpm_tis_i2c_calc_ordinal_duration(struct tpm_chip_priv *priv,
  49                                                u32 ordinal)
  50 {
  51         int duration_idx = TPM_UNDEFINED;
  52         int duration = 0;
  53
  54         if (ordinal < TPM_MAX_ORDINAL) {
  55                 duration_idx = tpm_ordinal_duration[ordinal];
  56         } else if ((ordinal & TPM_PROTECTED_ORDINAL_MASK) <
  57                         TPM_MAX_PROTECTED_ORDINAL) {
  58                 duration_idx = tpm_protected_ordinal_duration[
  59                                 ordinal & TPM_PROTECTED_ORDINAL_MASK];
  60         }
  61
  62         if (duration_idx != TPM_UNDEFINED)
  63                 duration = priv->duration_ms[duration_idx];
  64
  65         if (duration <= 0)
  66                 return 2 * 60 * 1000; /* Two minutes timeout */
  67         else
  68                 return duration;
  69 }
  70
  71 int tpm_xfer(struct udevice *dev, const uint8_t *sendbuf, size_t send_size,
  72         uint8_t *recvbuf, size_t *recv_size)
  73 {
  74         struct tpm_chip_priv *priv = dev_get_uclass_priv(dev);
  75         struct tpm_ops *ops = tpm_get_ops(dev);
  76         ulong start, stop;
  77         uint count, ordinal;
  78         int ret, ret2;
  79
  80         if (ops->xfer)
  81                 return ops->xfer(dev, sendbuf, send_size, recvbuf, recv_size);
  82
  83         if (!ops->send || !ops->recv)
  84                 return -ENOSYS;
  85
  86         /* switch endianess: big->little */
  87         count = get_unaligned_be32(sendbuf + TPM_CMD_COUNT_BYTE);
  88         ordinal = get_unaligned_be32(sendbuf + TPM_CMD_ORDINAL_BYTE);
  89
  90         if (count == 0) {
  91                 debug("no data\n");
  92                 return -ENODATA;
  93         }
  94         if (count > send_size) {
  95                 debug("invalid count value %x %zx\n", count, send_size);
  96                 return -E2BIG;
  97         }
  98
  99         debug("%s: Calling send\n", __func__);
 100         ret = ops->send(dev, sendbuf, send_size);
 101         if (ret < 0)
 102                 return ret;
 103
 104         start = get_timer(0);
 105         stop = tpm_tis_i2c_calc_ordinal_duration(priv, ordinal);
 106         do {
 107                 ret = ops->recv(dev, priv->buf, sizeof(priv->buf));
 108                 if (ret >= 0) {
 109                         if (ret > *recv_size)
 110                                 return -ENOSPC;
 111                         memcpy(recvbuf, priv->buf, ret);
 112                         *recv_size = ret;
 113                         ret = 0;
 114                         break;
 115                 } else if (ret != -EAGAIN) {
 116                         return ret;
 117                 }
 118
 119                 mdelay(priv->retry_time_ms);
 120                 if (get_timer(start) > stop) {
 121                         ret = -ETIMEDOUT;
 122                         break;
 123                 }
 124         } while (ret);
 125
 126         ret2 = ops->cleanup ? ops->cleanup(dev) : 0;
 127
 128         return ret2 ? ret2 : ret;
 129 }
 130
 131 UCLASS_DRIVER(tpm) = {
 132         .id             = UCLASS_TPM,
 133         .name           = "tpm",
 134         .flags          = DM_UC_FLAG_SEQ_ALIAS,
 135         .per_device_auto_alloc_size     = sizeof(struct tpm_chip_priv),
 136 };