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 }; 137