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