tis.c

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/* SPDX-License-Identifier: BSD-3-Clause */
 
#include <console/console.h>
#include <security/tpm/tis.h>
 
#include "tpm.h"
 
static unsigned int tpm_is_open;
 
static const struct {
        uint16_t vid;
        uint16_t did;
        const char *device_name;
} dev_map[] = {
        { 0x15d1, 0x001b, "SLB9670" },
        { 0x1ae0, 0x0028, "CR50" },
        { 0x104a, 0x0000, "ST33HTPH2E32" },
};
 
static const char *tis_get_dev_name(struct tpm2_info *info)
{
        int i;
 
        for (i = 0; i < ARRAY_SIZE(dev_map); i++)
                if ((dev_map[i].vid == info->vendor_id) &&
                    (dev_map[i].did == info->device_id))
                        return dev_map[i].device_name;
        return "Unknown";
}
 
int tis_open(void)
{
        if (tpm_is_open) {
                printk(BIOS_ERR, "%s() called twice.\n", __func__);
                return -1;
        }
        return 0;
}
 
int tis_close(void)
{
        if (tpm_is_open) {
 
                /*
                 * Do we need to do something here, like waiting for a
                 * transaction to stop?
                 */
                tpm_is_open = 0;
        }
 
        return 0;
}
 
int tis_init(void)
{
        struct spi_slave spi;
        struct tpm2_info info;
 
        if (spi_setup_slave(CONFIG_DRIVER_TPM_SPI_BUS,
                            CONFIG_DRIVER_TPM_SPI_CHIP, &spi)) {
                printk(BIOS_ERR, "Failed to setup TPM SPI slave\n");
                return -1;
        }
 
        if (tpm2_init(&spi)) {
                printk(BIOS_ERR, "Failed to initialize TPM SPI interface\n");
                return -1;
        }
 
        tpm2_get_info(&info);
 
        printk(BIOS_INFO, "Initialized TPM device %s revision %d\n",
               tis_get_dev_name(&info), info.revision);
 
        return 0;
}
 
int tis_sendrecv(const uint8_t *sendbuf, size_t sbuf_size,
                 uint8_t *recvbuf, size_t *rbuf_len)
{
        int len = tpm2_process_command(sendbuf, sbuf_size, recvbuf, *rbuf_len);
 
        if (len == 0)
                return -1;
 
        *rbuf_len = len;
 
        return 0;
}