Stefan Reinauer | d518c7a | 2013-11-04 17:38:32 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2011 Infineon Technologies |
| 3 | * Copyright 2013 Google Inc. |
| 4 | * |
Stefan Reinauer | d518c7a | 2013-11-04 17:38:32 -0800 | [diff] [blame] | 5 | * This program is free software; you can redistribute it and/or |
| 6 | * modify it under the terms of the GNU General Public License as |
| 7 | * published by the Free Software Foundation; either version 2 of |
| 8 | * the License, or (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but without any warranty; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
Stefan Reinauer | d518c7a | 2013-11-04 17:38:32 -0800 | [diff] [blame] | 14 | */ |
| 15 | |
| 16 | #include <stdint.h> |
| 17 | #include <string.h> |
| 18 | #include <assert.h> |
| 19 | #include <delay.h> |
Stefan Reinauer | d518c7a | 2013-11-04 17:38:32 -0800 | [diff] [blame] | 20 | #include <device/i2c.h> |
Julius Werner | 9ff8f6f | 2015-02-23 14:31:09 -0800 | [diff] [blame] | 21 | #include <endian.h> |
Stefan Reinauer | d518c7a | 2013-11-04 17:38:32 -0800 | [diff] [blame] | 22 | #include <tpm.h> |
| 23 | #include "tpm.h" |
Sourabh Banerjee | 8c916ec | 2015-01-20 15:18:40 +0530 | [diff] [blame] | 24 | #include <timer.h> |
Stefan Reinauer | d518c7a | 2013-11-04 17:38:32 -0800 | [diff] [blame] | 25 | |
| 26 | #include <console/console.h> |
| 27 | |
| 28 | /* global structure for tpm chip data */ |
| 29 | struct tpm_chip g_chip; |
| 30 | |
| 31 | #define TPM_CMD_COUNT_BYTE 2 |
| 32 | #define TPM_CMD_ORDINAL_BYTE 6 |
Sourabh Banerjee | 8c916ec | 2015-01-20 15:18:40 +0530 | [diff] [blame] | 33 | #define TPM_VALID_STATUS (1 << 7) |
Stefan Reinauer | d518c7a | 2013-11-04 17:38:32 -0800 | [diff] [blame] | 34 | |
| 35 | int tis_open(void) |
| 36 | { |
| 37 | int rc; |
| 38 | |
| 39 | if (g_chip.is_open) { |
| 40 | printk(BIOS_DEBUG, "tis_open() called twice.\n"); |
| 41 | return -1; |
| 42 | } |
| 43 | |
| 44 | rc = tpm_vendor_init(CONFIG_DRIVER_TPM_I2C_BUS, |
| 45 | CONFIG_DRIVER_TPM_I2C_ADDR); |
| 46 | |
| 47 | if (rc < 0) |
| 48 | g_chip.is_open = 0; |
| 49 | |
| 50 | if (rc) { |
| 51 | return -1; |
| 52 | } |
| 53 | |
| 54 | return 0; |
| 55 | } |
| 56 | |
| 57 | int tis_close(void) |
| 58 | { |
| 59 | if (g_chip.is_open) { |
| 60 | tpm_vendor_cleanup(&g_chip); |
| 61 | g_chip.is_open = 0; |
| 62 | } |
| 63 | |
| 64 | return 0; |
| 65 | } |
| 66 | |
| 67 | int tis_init(void) |
| 68 | { |
| 69 | int bus = CONFIG_DRIVER_TPM_I2C_BUS; |
| 70 | int chip = CONFIG_DRIVER_TPM_I2C_ADDR; |
Sourabh Banerjee | 8c916ec | 2015-01-20 15:18:40 +0530 | [diff] [blame] | 71 | struct stopwatch sw; |
| 72 | uint8_t buf = 0; |
| 73 | int ret; |
| 74 | long sw_run_duration = 750; |
Stefan Reinauer | d518c7a | 2013-11-04 17:38:32 -0800 | [diff] [blame] | 75 | |
| 76 | /* |
Sourabh Banerjee | 8c916ec | 2015-01-20 15:18:40 +0530 | [diff] [blame] | 77 | * Probe TPM. Check if the TPM_ACCESS register's ValidSts bit is set(1) |
| 78 | * If the bit remains clear(0) then claim that init has failed. |
Stefan Reinauer | d518c7a | 2013-11-04 17:38:32 -0800 | [diff] [blame] | 79 | */ |
Sourabh Banerjee | 8c916ec | 2015-01-20 15:18:40 +0530 | [diff] [blame] | 80 | stopwatch_init_msecs_expire(&sw, sw_run_duration); |
| 81 | do { |
| 82 | ret = i2c_readb(bus, chip, 0, &buf); |
| 83 | if (!ret && (buf & TPM_VALID_STATUS)) { |
| 84 | sw_run_duration = stopwatch_duration_msecs(&sw); |
| 85 | break; |
| 86 | } |
| 87 | } while (!stopwatch_expired(&sw)); |
| 88 | |
| 89 | printk(BIOS_INFO, |
| 90 | "%s: ValidSts bit %s(%d) in TPM_ACCESS register after %ld ms\n", |
| 91 | __func__, (buf & TPM_VALID_STATUS) ? "set" : "clear", |
| 92 | (buf & TPM_VALID_STATUS) >> 7, sw_run_duration); |
| 93 | |
| 94 | /* |
| 95 | * Claim failure if the ValidSts (bit 7) is clear. |
| 96 | */ |
| 97 | if (!(buf & TPM_VALID_STATUS)) |
Stefan Reinauer | d518c7a | 2013-11-04 17:38:32 -0800 | [diff] [blame] | 98 | return -1; |
| 99 | |
| 100 | return 0; |
| 101 | } |
| 102 | |
| 103 | static ssize_t tpm_transmit(const uint8_t *buf, size_t bufsiz) |
| 104 | { |
| 105 | int rc; |
| 106 | uint32_t count, ordinal; |
| 107 | |
| 108 | struct tpm_chip *chip = &g_chip; |
| 109 | |
| 110 | memcpy(&count, buf + TPM_CMD_COUNT_BYTE, sizeof(count)); |
| 111 | count = be32_to_cpu(count); |
| 112 | memcpy(&ordinal, buf + TPM_CMD_ORDINAL_BYTE, sizeof(ordinal)); |
| 113 | ordinal = be32_to_cpu(ordinal); |
| 114 | |
| 115 | if (count == 0) { |
| 116 | printk(BIOS_DEBUG, "tpm_transmit: no data\n"); |
| 117 | return -1; |
| 118 | } |
| 119 | if (count > bufsiz) { |
| 120 | printk(BIOS_DEBUG, "tpm_transmit: invalid count value %x %zx\n", |
| 121 | count, bufsiz); |
| 122 | return -1; |
| 123 | } |
| 124 | |
| 125 | ASSERT(chip->vendor.send); |
| 126 | rc = chip->vendor.send(chip, (uint8_t *) buf, count); |
| 127 | if (rc < 0) { |
| 128 | printk(BIOS_DEBUG, "tpm_transmit: tpm_send error\n"); |
| 129 | goto out; |
| 130 | } |
| 131 | |
| 132 | if (chip->vendor.irq) |
| 133 | goto out_recv; |
| 134 | |
| 135 | int timeout = 2 * 60 * 1000; /* two minutes timeout */ |
| 136 | while (timeout) { |
| 137 | ASSERT(chip->vendor.status); |
| 138 | uint8_t status = chip->vendor.status(chip); |
| 139 | if ((status & chip->vendor.req_complete_mask) == |
| 140 | chip->vendor.req_complete_val) { |
| 141 | goto out_recv; |
| 142 | } |
| 143 | |
| 144 | if ((status == chip->vendor.req_canceled)) { |
| 145 | printk(BIOS_DEBUG, "tpm_transmit: Operation Canceled\n"); |
| 146 | rc = -1; |
| 147 | goto out; |
| 148 | } |
| 149 | mdelay(TPM_TIMEOUT); |
| 150 | timeout--; |
| 151 | } |
| 152 | |
| 153 | ASSERT(chip->vendor.cancel); |
| 154 | chip->vendor.cancel(chip); |
| 155 | printk(BIOS_DEBUG, "tpm_transmit: Operation Timed out\n"); |
| 156 | rc = -1; //ETIME; |
| 157 | goto out; |
| 158 | |
| 159 | out_recv: |
| 160 | |
| 161 | rc = chip->vendor.recv(chip, (uint8_t *) buf, TPM_BUFSIZE); |
| 162 | if (rc < 0) |
Furquan Shaikh | 251eef1 | 2014-07-22 11:12:15 -0700 | [diff] [blame] | 163 | printk(BIOS_DEBUG, "tpm_transmit: tpm_recv: error %d\n", rc); |
Stefan Reinauer | d518c7a | 2013-11-04 17:38:32 -0800 | [diff] [blame] | 164 | out: |
| 165 | return rc; |
| 166 | } |
| 167 | |
| 168 | int tis_sendrecv(const uint8_t *sendbuf, size_t sbuf_size, |
| 169 | uint8_t *recvbuf, size_t *rbuf_len) |
| 170 | { |
| 171 | uint8_t buf[TPM_BUFSIZE]; |
| 172 | |
| 173 | if (sizeof(buf) < sbuf_size) |
| 174 | return -1; |
| 175 | |
| 176 | memcpy(buf, sendbuf, sbuf_size); |
| 177 | |
| 178 | int len = tpm_transmit(buf, sbuf_size); |
| 179 | |
| 180 | if (len < 10) { |
| 181 | *rbuf_len = 0; |
| 182 | return -1; |
| 183 | } |
| 184 | |
| 185 | if (len > *rbuf_len) { |
| 186 | *rbuf_len = len; |
| 187 | return -1; |
| 188 | } |
| 189 | |
| 190 | memcpy(recvbuf, buf, len); |
| 191 | *rbuf_len = len; |
| 192 | |
| 193 | return 0; |
| 194 | } |