| /* 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 |
| |
| int tis_open(void) |
| { |
| int rc; |
| |
| if (chip.is_open) { |
| printk(BIOS_DEBUG, "%s() called twice.\n", __func__); |
| return -1; |
| } |
| |
| rc = tpm_vendor_init(&chip, CONFIG_DRIVER_TPM_I2C_BUS, |
| CONFIG_DRIVER_TPM_I2C_ADDR); |
| if (rc < 0) |
| chip.is_open = 0; |
| |
| if (rc) |
| return -1; |
| |
| return 0; |
| } |
| |
| int tis_close(void) |
| { |
| if (chip.is_open) { |
| tpm_vendor_cleanup(&chip); |
| chip.is_open = 0; |
| } |
| |
| return 0; |
| } |
| |
| int tis_init(void) |
| { |
| return tpm_vendor_probe(CONFIG_DRIVER_TPM_I2C_BUS, |
| CONFIG_DRIVER_TPM_I2C_ADDR); |
| } |
| |
| static ssize_t tpm_transmit(const uint8_t *sbuf, size_t sbufsiz, void *rbuf, |
| size_t rbufsiz) |
| { |
| int rc; |
| uint32_t count; |
| |
| memcpy(&count, sbuf + TPM_CMD_COUNT_BYTE, sizeof(count)); |
| count = be32_to_cpu(count); |
| |
| if (!chip.vendor.send || !chip.vendor.status || !chip.vendor.cancel) |
| return -1; |
| |
| if (count == 0) { |
| printk(BIOS_DEBUG, "%s: no data\n", __func__); |
| return -1; |
| } |
| if (count > sbufsiz) { |
| printk(BIOS_DEBUG, "%s: invalid count value %x %zx\n", __func__, |
| count, sbufsiz); |
| return -1; |
| } |
| |
| ASSERT(chip.vendor.send); |
| rc = chip.vendor.send(&chip, (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.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, |
| "%s: Operation Canceled\n", __func__); |
| rc = -1; |
| goto out; |
| } |
| mdelay(TPM_TIMEOUT); |
| timeout--; |
| } |
| |
| ASSERT(chip.vendor.cancel); |
| chip.vendor.cancel(&chip); |
| printk(BIOS_DEBUG, "%s: Operation Timed out\n", __func__); |
| rc = -1; //ETIME; |
| goto out; |
| |
| out_recv: |
| |
| rc = chip.vendor.recv(&chip, (uint8_t *) rbuf, rbufsiz); |
| if (rc < 0) |
| printk(BIOS_DEBUG, "%s: tpm_recv: error %d\n", __func__, rc); |
| out: |
| return rc; |
| } |
| |
| int tis_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 -1; |
| } |
| |
| if (len > *rbuf_len) { |
| *rbuf_len = len; |
| return -1; |
| } |
| |
| *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 0; |
| } |