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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 | // SPDX-License-Identifier: GPL-2.0+ /* * Copyright (c) 2015 Google, Inc * Written by Simon Glass <sjg@chromium.org> */ #define LOG_CATEGORY UCLASS_TPM #include <dm.h> #include <log.h> #include <time.h> #include <tpm_api.h> #include <tpm-v1.h> #include <tpm-v2.h> #include <dm/lists.h> #include <linux/delay.h> #include <linux/unaligned/be_byteshift.h> #include "tpm_internal.h" #define TPM_RNG_DRV_NAME "tpm-rng" int tpm_open(struct udevice *dev) { struct tpm_ops *ops = tpm_get_ops(dev); if (!ops->open) return -ENOSYS; return ops->open(dev); } int tpm_close(struct udevice *dev) { struct tpm_ops *ops = tpm_get_ops(dev); if (!ops->close) return -ENOSYS; return ops->close(dev); } int tpm_get_desc(struct udevice *dev, char *buf, int size) { struct tpm_ops *ops = tpm_get_ops(dev); if (!ops->get_desc) return -ENOSYS; return ops->get_desc(dev, buf, size); } int tpm_report_state(struct udevice *dev, char *buf, int size) { struct tpm_ops *ops = tpm_get_ops(dev); if (!ops->report_state) return -ENOSYS; return ops->report_state(dev, buf, size); } /* Returns max number of milliseconds to wait */ static ulong tpm_tis_i2c_calc_ordinal_duration(struct tpm_chip_priv *priv, u32 ordinal) { int duration_idx = TPM_UNDEFINED; int duration = 0; if (ordinal < TPM_MAX_ORDINAL) { duration_idx = tpm_ordinal_duration[ordinal]; } else if ((ordinal & TPM_PROTECTED_ORDINAL_MASK) < TPM_MAX_PROTECTED_ORDINAL) { duration_idx = tpm_protected_ordinal_duration[ ordinal & TPM_PROTECTED_ORDINAL_MASK]; } if (duration_idx != TPM_UNDEFINED) duration = priv->duration_ms[duration_idx]; if (duration <= 0) return 2 * 60 * 1000; /* Two minutes timeout */ else return duration; } int tpm_xfer(struct udevice *dev, const uint8_t *sendbuf, size_t send_size, uint8_t *recvbuf, size_t *recv_size) { struct tpm_chip_priv *priv = dev_get_uclass_priv(dev); struct tpm_ops *ops = tpm_get_ops(dev); ulong start, stop; uint count, ordinal; int ret, ret2 = 0; if (ops->xfer) return ops->xfer(dev, sendbuf, send_size, recvbuf, recv_size); if (!ops->send || !ops->recv) return -ENOSYS; /* switch endianess: big->little */ count = get_unaligned_be32(sendbuf + TPM_CMD_COUNT_BYTE); ordinal = get_unaligned_be32(sendbuf + TPM_CMD_ORDINAL_BYTE); if (count == 0) { log_debug("no data\n"); return -ENODATA; } if (count > send_size) { log_debug("invalid count value %x %zx\n", count, send_size); return -E2BIG; } log_debug("%s: Calling send\n", __func__); ret = ops->send(dev, sendbuf, send_size); if (ret < 0) return ret; start = get_timer(0); stop = tpm_tis_i2c_calc_ordinal_duration(priv, ordinal); do { ret = ops->recv(dev, priv->buf, sizeof(priv->buf)); if (ret >= 0) { if (ret > *recv_size) return -ENOSPC; memcpy(recvbuf, priv->buf, ret); *recv_size = ret; ret = 0; break; } else if (ret != -EAGAIN) { return ret; } mdelay(priv->retry_time_ms); if (get_timer(start) > stop) { ret = -ETIMEDOUT; break; } } while (ret); if (ret) { if (ops->cleanup) { ret2 = ops->cleanup(dev); if (ret2) return log_msg_ret("cleanup", ret2); } return log_msg_ret("xfer", ret); } return 0; } static int tpm_uclass_post_probe(struct udevice *dev) { int ret; const char *drv = TPM_RNG_DRV_NAME; struct udevice *child; if (IS_ENABLED(CONFIG_TPM_RNG)) { ret = device_find_first_child_by_uclass(dev, UCLASS_RNG, &child); if (ret != -ENODEV) { log_debug("RNG child already added to the TPM device\n"); return ret; } ret = device_bind_driver(dev, drv, TPM_RNG_DRV_NAME, &child); if (ret) return log_msg_ret("bind", ret); } return 0; } UCLASS_DRIVER(tpm) = { .id = UCLASS_TPM, .name = "tpm", .flags = DM_UC_FLAG_SEQ_ALIAS, #if CONFIG_IS_ENABLED(OF_REAL) .post_bind = dm_scan_fdt_dev, #endif .post_probe = tpm_uclass_post_probe, .per_device_auto = sizeof(struct tpm_chip_priv), }; |