| /* |
| * Copyright (C) 2011 Infineon Technologies |
| * Copyright 2013 Google Inc. |
| * |
| * See file CREDITS for list of people who contributed to this |
| * project. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License as |
| * published by the Free Software Foundation; either version 2 of |
| * the License, or (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but without any warranty; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| * MA 02111-1307 USA |
| */ |
| |
| #include <asm/byteorder.h> |
| #include <common.h> |
| #include <stdint.h> |
| #include <string.h> |
| #include <tpm.h> |
| #include "tpm.h" |
| |
| #ifdef DEBUG |
| #include <assert.h> |
| #define ASSERT(x) assert(x) |
| #else |
| #define ASSERT(x) ((void)0) |
| #endif |
| |
| #define BIOS_DEBUG KERN_DEBUG |
| |
| /* global structure for tpm chip data */ |
| struct tpm_chip g_chip; |
| |
| #define TPM_CMD_COUNT_BYTE 2 |
| #define TPM_CMD_ORDINAL_BYTE 6 |
| #define TPM_VALID_STATUS (1 << 7) |
| |
| int tis_open(void) |
| { |
| if (!g_chip.is_open) { |
| printk(BIOS_DEBUG "TPM is not available.\n"); |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| int tis_close(void) |
| { |
| return 0; |
| } |
| |
| int tis_init(void) |
| { |
| if (!g_chip.is_open) { |
| printk(BIOS_DEBUG "TPM is not available.\n"); |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| static ssize_t tpm_transmit(const uint8_t *buf, size_t bufsiz) |
| { |
| int rc; |
| uint32_t count, ordinal; |
| |
| struct tpm_chip *chip = &g_chip; |
| |
| memcpy(&count, buf + TPM_CMD_COUNT_BYTE, sizeof(count)); |
| count = be32_to_cpu(count); |
| memcpy(&ordinal, buf + TPM_CMD_ORDINAL_BYTE, sizeof(ordinal)); |
| ordinal = be32_to_cpu(ordinal); |
| |
| if (count == 0) { |
| printk(BIOS_DEBUG "tpm_transmit: no data\n"); |
| return -1; |
| } |
| if (count > bufsiz) { |
| printk(BIOS_DEBUG "tpm_transmit: invalid count value %x %zx\n", |
| count, bufsiz); |
| return -1; |
| } |
| |
| ASSERT(chip->vendor.send); |
| rc = chip->vendor.send(chip, (uint8_t *) buf, count); |
| if (rc < 0) { |
| printk(BIOS_DEBUG "tpm_transmit: tpm_send error\n"); |
| goto out; |
| } |
| |
| if (chip->vendor.irq) |
| goto out_recv; |
| |
| int timeout = 2 * 60 * 1000; /* two minutes timeout */ |
| while (timeout) { |
| ASSERT(chip->vendor.status); |
| uint8_t status = chip->vendor.status(chip); |
| if ((status & chip->vendor.req_complete_mask) == |
| chip->vendor.req_complete_val) { |
| goto out_recv; |
| } |
| |
| if ((status == chip->vendor.req_canceled)) { |
| printk(BIOS_DEBUG "tpm_transmit: Operation Canceled\n"); |
| rc = -1; |
| goto out; |
| } |
| mdelay(TPM_TIMEOUT); |
| timeout--; |
| } |
| |
| ASSERT(chip->vendor.cancel); |
| chip->vendor.cancel(chip); |
| printk(BIOS_DEBUG "tpm_transmit: Operation Timed out\n"); |
| rc = -1; //ETIME; |
| goto out; |
| |
| out_recv: |
| |
| rc = chip->vendor.recv(chip, (uint8_t *) buf, TPM_BUFSIZE); |
| if (rc < 0) |
| printk(BIOS_DEBUG "tpm_transmit: tpm_recv: error %d\n", rc); |
| out: |
| return rc; |
| } |
| |
| int tis_sendrecv(const uint8_t *sendbuf, size_t sbuf_size, |
| uint8_t *recvbuf, size_t *rbuf_len) |
| { |
| uint8_t buf[TPM_BUFSIZE]; |
| |
| if (sizeof(buf) < sbuf_size) |
| return -1; |
| |
| memcpy(buf, sendbuf, sbuf_size); |
| |
| int len = tpm_transmit(buf, sbuf_size); |
| |
| if (len < 10) { |
| *rbuf_len = 0; |
| return -1; |
| } |
| |
| if (len > *rbuf_len) { |
| *rbuf_len = len; |
| return -1; |
| } |
| |
| memcpy(recvbuf, buf, len); |
| *rbuf_len = len; |
| |
| return 0; |
| } |