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/* SPDX-License-Identifier: GPL-2.0-or-later */
#include <stdint.h>
#include <string.h>
#include <assert.h>
#include <commonlib/endian.h>
#include <console/console.h>
#include <delay.h>
#include <device/i2c_simple.h>
#include <endian.h>
#include <lib.h>
#include <security/tpm/tis.h>
#include "tpm.h"
/* global structure for tpm chip data */
static struct tpm_chip chip;
#define TPM_CMD_COUNT_BYTE 2
#define TPM_CMD_ORDINAL_BYTE 6
static ssize_t tpm_transmit(const uint8_t *sbuf, size_t sbufsiz, void *rbuf,
size_t rbufsiz)
{
int rc = -1;
uint32_t count;
memcpy(&count, sbuf + TPM_CMD_COUNT_BYTE, sizeof(count));
count = be32_to_cpu(count);
if (!chip.send || !chip.status || !chip.cancel)
goto out;
if (count == 0) {
printk(BIOS_DEBUG, "%s: no data\n", __func__);
goto out;
}
if (count > sbufsiz) {
printk(BIOS_DEBUG, "%s: invalid count value %#x %zx\n", __func__,
count, sbufsiz);
goto out;
}
ASSERT(chip.send);
rc = chip.send((uint8_t *)sbuf, count);
if (rc < 0) {
printk(BIOS_DEBUG, "%s: tpm_send error\n", __func__);
goto out;
}
int timeout = 2 * 60 * 1000; /* two minutes timeout */
while (timeout) {
ASSERT(chip.status);
uint8_t status = chip.status();
if ((status & chip.req_complete_mask) == chip.req_complete_val) {
goto out_recv;
}
if (status == chip.req_canceled) {
printk(BIOS_DEBUG,
"%s: Operation Canceled\n", __func__);
rc = -1;
goto out;
}
mdelay(TPM_TIMEOUT);
timeout--;
}
ASSERT(chip.cancel);
chip.cancel();
printk(BIOS_DEBUG, "%s: Operation Timed out\n", __func__);
rc = -1;
goto out;
out_recv:
rc = chip.recv((uint8_t *)rbuf, rbufsiz);
if (rc < 0)
printk(BIOS_DEBUG, "%s: tpm_recv: error %d\n", __func__, rc);
out:
return rc;
}
static tpm_result_t i2c_tpm_sendrecv(const uint8_t *sendbuf, size_t sbuf_size,
uint8_t *recvbuf, size_t *rbuf_len)
{
ASSERT(sbuf_size >= 10);
/* Display the TPM command */
if (CONFIG(DRIVER_TPM_DISPLAY_TIS_BYTES)) {
printk(BIOS_DEBUG, "TPM Command: 0x%08x\n",
read_at_be32(sendbuf, sizeof(uint16_t)
+ sizeof(uint32_t)));
hexdump(sendbuf, sbuf_size);
}
int len = tpm_transmit(sendbuf, sbuf_size, recvbuf, *rbuf_len);
if (len < 10) {
*rbuf_len = 0;
return TPM_CB_FAIL;
}
if (len > *rbuf_len) {
*rbuf_len = len;
return TPM_CB_FAIL;
}
*rbuf_len = len;
/* Display the TPM response */
if (CONFIG(DRIVER_TPM_DISPLAY_TIS_BYTES)) {
printk(BIOS_DEBUG, "TPM Response: 0x%08x\n",
read_at_be32(recvbuf, sizeof(uint16_t)
+ sizeof(uint32_t)));
hexdump(recvbuf, *rbuf_len);
}
return TPM_SUCCESS;
}
tis_sendrecv_fn i2c_tis_probe(enum tpm_family *family)
{
if (tpm_vendor_probe(CONFIG_DRIVER_TPM_I2C_BUS, CONFIG_DRIVER_TPM_I2C_ADDR, family))
return NULL;
if (tpm_vendor_init(&chip, CONFIG_DRIVER_TPM_I2C_BUS, CONFIG_DRIVER_TPM_I2C_ADDR))
return NULL;
return &i2c_tpm_sendrecv;
}
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