| /* SPDX-License-Identifier: GPL-2.0-only */ |
| /* This file is part of the coreboot project. */ |
| |
| #include <console/console.h> |
| #include <security/tpm/tis.h> |
| #include <arch/acpigen.h> |
| #include <device/device.h> |
| #include <drivers/intel/ptt/ptt.h> |
| |
| #include "tpm.h" |
| #include "chip.h" |
| |
| static unsigned int tpm_is_open; |
| |
| static const struct { |
| uint16_t vid; |
| uint16_t did; |
| const char *device_name; |
| } dev_map[] = { |
| {0x1ae0, 0x0028, "CR50"}, |
| {0xa13a, 0x8086, "Intel iTPM"} |
| }; |
| |
| 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; |
| } |
| |
| if (CONFIG(HAVE_INTEL_PTT)) { |
| if (!ptt_active()) { |
| printk(BIOS_ERR, "%s: Intel PTT is not active.\n", __func__); |
| return -1; |
| } |
| printk(BIOS_DEBUG, "%s: Intel PTT is active.\n", __func__); |
| } |
| |
| 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 tpm2_info info; |
| |
| // Wake TPM up (if necessary) |
| if (tpm2_init() != 0) |
| 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; |
| } |
| |
| static void crb_tpm_fill_ssdt(const struct device *dev) |
| { |
| const char *path = acpi_device_path(dev); |
| if (!path) { |
| path = "\\_SB_.TPM"; |
| printk(BIOS_DEBUG, "Using default TPM2 ACPI path: '%s'\n", path); |
| } |
| |
| /* Device */ |
| acpigen_write_device(path); |
| |
| acpigen_write_name_string("_HID", "MSFT0101"); |
| acpigen_write_name_string("_CID", "MSFT0101"); |
| |
| acpi_device_write_uid(dev); |
| |
| acpigen_write_STA(ACPI_STATUS_DEVICE_ALL_ON); |
| |
| /* Resources */ |
| acpigen_write_name("_CRS"); |
| acpigen_write_resourcetemplate_header(); |
| acpigen_write_mem32fixed(1, TPM_CRB_BASE_ADDRESS, 0x5000); |
| |
| acpigen_write_resourcetemplate_footer(); |
| |
| acpigen_pop_len(); /* Device */ |
| } |
| |
| static const char *crb_tpm_acpi_name(const struct device *dev) |
| { |
| return "TPM"; |
| } |
| |
| static struct device_operations __unused crb_ops = { |
| .read_resources = noop_read_resources, |
| .set_resources = noop_set_resources, |
| #if CONFIG(HAVE_ACPI_TABLES) |
| .acpi_name = crb_tpm_acpi_name, |
| .acpi_fill_ssdt = crb_tpm_fill_ssdt, |
| #endif |
| |
| }; |
| |
| static void enable_dev(struct device *dev) |
| { |
| #if !DEVTREE_EARLY |
| dev->ops = &crb_ops; |
| #endif |
| } |
| |
| struct chip_operations drivers_crb_ops = { |
| CHIP_NAME("CRB TPM") |
| .enable_dev = enable_dev |
| }; |