0ca944b16f
Change-Id: I1c09eda6164efb390de4626f52aafba59962f9c4 Signed-off-by: Arthur Heymans <arthur@aheymans.xyz> Reviewed-on: https://review.coreboot.org/c/coreboot/+/37029 Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr> Reviewed-by: Patrick Georgi <pgeorgi@google.com> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
132 lines
3.3 KiB
C
132 lines
3.3 KiB
C
/*
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* This file is part of the coreboot project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but without any warranty; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <assert.h>
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#include <commonlib/endian.h>
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#include <console/console.h>
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#include <delay.h>
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#include <device/i2c_simple.h>
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#include <endian.h>
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#include <lib.h>
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#include <security/tpm/tis.h>
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#include <stdlib.h>
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#include <timer.h>
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#include <types.h>
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#define RECV_TIMEOUT (1 * 1000) /* 1 second */
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#define XMIT_TIMEOUT (1 * 1000) /* 1 second */
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#define SLEEP_DURATION 1000 /* microseconds */
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struct tpm_output_header {
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uint16_t tag;
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uint32_t length;
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uint32_t return_code;
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} __packed;
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int tis_open(void)
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{
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return 0;
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}
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int tis_close(void)
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{
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return 0;
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}
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int tis_init(void)
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{
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return 0;
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}
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int tis_sendrecv(const uint8_t *sendbuf, size_t sbuf_size,
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uint8_t *recvbuf, size_t *rbuf_len)
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{
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size_t hdr_bytes;
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struct tpm_output_header *header;
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size_t max_recv_bytes;
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size_t recv_bytes;
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int status;
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struct stopwatch sw;
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ASSERT(sbuf_size >= 10);
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if (CONFIG(DRIVER_TPM_DISPLAY_TIS_BYTES)) {
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/* Display the TPM command */
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if (sbuf_size >= 10)
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printk(BIOS_DEBUG, "TPM Command: 0x%08x\n",
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read_at_be32(sendbuf, sizeof(uint16_t)
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+ sizeof(uint32_t)));
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hexdump(sendbuf, sbuf_size);
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}
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/* Send the command to the TPM */
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stopwatch_init_msecs_expire(&sw, XMIT_TIMEOUT);
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while (1) {
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status = i2c_write_raw(CONFIG_DRIVER_TPM_I2C_BUS,
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CONFIG_DRIVER_TPM_I2C_ADDR, (uint8_t *)sendbuf,
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sbuf_size);
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if ((status < 0) && (!stopwatch_expired(&sw)))
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continue;
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if (status < 0)
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return status;
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break;
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}
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/* Read the TPM response header */
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max_recv_bytes = *rbuf_len;
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ASSERT(max_recv_bytes >= sizeof(*header));
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hdr_bytes = sizeof(*header);
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header = (struct tpm_output_header *)recvbuf;
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stopwatch_init_msecs_expire(&sw, RECV_TIMEOUT);
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do {
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status = i2c_read_raw(CONFIG_DRIVER_TPM_I2C_BUS,
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CONFIG_DRIVER_TPM_I2C_ADDR, recvbuf, hdr_bytes);
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if (status > 0)
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break;
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udelay(SLEEP_DURATION);
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} while (!stopwatch_expired(&sw));
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if (status != sizeof(*header))
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return -1;
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/* Determine the number of bytes remaining */
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recv_bytes = min(be32_to_cpu(*(uint32_t *)&header->length),
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max_recv_bytes);
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/* Determine if there is additional response data */
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if (recv_bytes > hdr_bytes) {
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/* Display the TPM response */
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if (CONFIG(DRIVER_TPM_DISPLAY_TIS_BYTES))
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hexdump(recvbuf, hdr_bytes);
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/* Read the full TPM response */
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status = i2c_read_raw(CONFIG_DRIVER_TPM_I2C_BUS,
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CONFIG_DRIVER_TPM_I2C_ADDR, recvbuf, recv_bytes);
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if (status < 0)
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return status;
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}
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/* Return the number of bytes received */
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*rbuf_len = status;
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/* Display the TPM response */
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if (CONFIG(DRIVER_TPM_DISPLAY_TIS_BYTES)) {
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printk(BIOS_DEBUG, "TPM Response: 0x%08x\n",
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read_at_be32(recvbuf, sizeof(uint16_t)
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+ sizeof(uint32_t)));
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hexdump(recvbuf, *rbuf_len);
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}
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/* Successful transfer */
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return 0;
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}
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