src/drivers/spi/tpm/tis.c

   1 /* SPDX-License-Identifier: BSD-3-Clause */
   2
   3 #include <console/console.h>
   4 #include <security/tpm/tis.h>
   5
   6 #include "tpm.h"
   7
   8 static unsigned int tpm_is_open;
   9
  10 static const struct {
  11         uint16_t vid;
  12         uint16_t did;
  13         const char *device_name;
  14 } dev_map[] = {
  15         { 0x15d1, 0x001b, "SLB9670" },
  16         { 0x1ae0, 0x0028, "CR50" },
  17         { 0x104a, 0x0000, "ST33HTPH2E32" },
  18 };
  19
  20 static const char *tis_get_dev_name(struct tpm2_info *info)
  21 {
  22         int i;
  23
  24         for (i = 0; i < ARRAY_SIZE(dev_map); i++)
  25                 if ((dev_map[i].vid == info->vendor_id) &&
  26                     (dev_map[i].did == info->device_id))
  27                         return dev_map[i].device_name;
  28         return "Unknown";
  29 }
  30
  31 int tis_open(void)
  32 {
  33         if (tpm_is_open) {
  34                 printk(BIOS_ERR, "%s() called twice.\n", __func__);
  35                 return -1;
  36         }
  37         return 0;
  38 }
  39
  40 int tis_close(void)
  41 {
  42         if (tpm_is_open) {
  43                 /*
  44                  * Do we need to do something here, like waiting for a
  45                  * transaction to stop?
  46                  */
  47                 tpm_is_open = 0;
  48         }
  49
  50         return 0;
  51 }
  52
  53 int tis_init(void)
  54 {
  55         struct spi_slave spi;
  56         struct tpm2_info info;
  57
  58         if (spi_setup_slave(CONFIG_DRIVER_TPM_SPI_BUS,
  59                             CONFIG_DRIVER_TPM_SPI_CHIP, &spi)) {
  60                 printk(BIOS_ERR, "Failed to setup TPM SPI slave\n");
  61                 return -1;
  62         }
  63
  64         if (tpm2_init(&spi)) {
  65                 printk(BIOS_ERR, "Failed to initialize TPM SPI interface\n");
  66                 return -1;
  67         }
  68
  69         tpm2_get_info(&info);
  70
  71         printk(BIOS_INFO, "Initialized TPM device %s revision %d\n",
  72                tis_get_dev_name(&info), info.revision);
  73
  74         return 0;
  75 }
  76
  77 int tis_sendrecv(const uint8_t *sendbuf, size_t sbuf_size,
  78                  uint8_t *recvbuf, size_t *rbuf_len)
  79 {
  80         int len = tpm2_process_command(sendbuf, sbuf_size, recvbuf, *rbuf_len);
  81
  82         if (len == 0)
  83                 return -1;
  84
  85         *rbuf_len = len;
  86
  87         return 0;
  88 }