[coreboot-gerrit] Patch set updated for coreboot: 8e560dd tpm: Move the LPC TPM driver to a subdirectory
Stefan Reinauer (stefan.reinauer@coreboot.org)
gerrit at coreboot.org
Fri Apr 10 03:25:59 CEST 2015
Stefan Reinauer (stefan.reinauer at coreboot.org) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/9468
-gerrit
commit 8e560dd2251f25732cfb16d6fd1356497c638591
Author: Duncan Laurie <dlaurie at chromium.org>
Date: Thu Oct 30 15:11:48 2014 -0700
tpm: Move the LPC TPM driver to a subdirectory
This moves the LPC TPM driver to drivers/pc80/tpm so it can
be turned into a ramstage driver with a chip.h
It includes no other changes yet.
BUG=chrome-os-partner:33385
BRANCH=samus,auron
TEST=emerge-samus coreboot
Change-Id: Iac83e52db96201f37a0086eae9df244f8b8d48d9
Signed-off-by: Stefan Reinauer <reinauer at chromium.org>
Original-Commit-Id: be2db391f9da80b8b75137af0fe81dc4724bc9d1
Original-Change-Id: I60ddd1d2a3e72bcf169a0b44e0c7ebcb87f4617d
Original-Signed-off-by: Duncan Laurie <dlaurie at chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/226660
Original-Reviewed-by: Aaron Durbin <adurbin at chromium.org>
---
src/drivers/pc80/Kconfig | 10 +-
src/drivers/pc80/Makefile.inc | 3 +-
src/drivers/pc80/tpm.c | 675 --------------------------------------
src/drivers/pc80/tpm/Kconfig | 7 +
src/drivers/pc80/tpm/Makefile.inc | 1 +
src/drivers/pc80/tpm/tpm.c | 675 ++++++++++++++++++++++++++++++++++++++
6 files changed, 686 insertions(+), 685 deletions(-)
diff --git a/src/drivers/pc80/Kconfig b/src/drivers/pc80/Kconfig
index f6da88c..a1e94ab 100644
--- a/src/drivers/pc80/Kconfig
+++ b/src/drivers/pc80/Kconfig
@@ -17,16 +17,10 @@ config DRIVERS_PS2_KEYBOARD
this option, then you can say N here to speed up boot time.
Otherwise say Y.
-config LPC_TPM
- bool
- default n
- help
- Enable this option to enable TPM support in coreboot.
-
- If unsure, say N.
-
config DRIVERS_MC146818
bool
default y if ARCH_X86
+source src/drivers/pc80/tpm/Kconfig
+
endif
diff --git a/src/drivers/pc80/Makefile.inc b/src/drivers/pc80/Makefile.inc
index 9715949..be8e8ea 100644
--- a/src/drivers/pc80/Makefile.inc
+++ b/src/drivers/pc80/Makefile.inc
@@ -9,10 +9,9 @@ ramstage-$(CONFIG_SPKMODEM) += spkmodem.c
romstage-$(CONFIG_DRIVERS_MC146818) += mc146818rtc_early.c
-romstage-$(CONFIG_LPC_TPM) += tpm.c
romstage-$(CONFIG_SPKMODEM) += spkmodem.c
-subdirs-y += vga
+subdirs-y += tpm vga
cbfs-files-$(CONFIG_HAVE_CMOS_DEFAULT) += cmos.default
cmos.default-file = $(CONFIG_CMOS_DEFAULT_FILE):nvramtool
diff --git a/src/drivers/pc80/tpm.c b/src/drivers/pc80/tpm.c
deleted file mode 100644
index c0429dd..0000000
--- a/src/drivers/pc80/tpm.c
+++ /dev/null
@@ -1,675 +0,0 @@
-/*
- * This file is part of the coreboot project.
- *
- * Copyright (C) 2011 The Chromium OS Authors. All rights reserved.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; version 2 of the License.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * The code in this file has been heavily based on the article "Writing a TPM
- * Device Driver" published on http://ptgmedia.pearsoncmg.com and the
- * submission by Stefan Berger on Qemu-devel mailing list.
- *
- * One principal difference is that in the simplest config the other than 0
- * TPM localities do not get mapped by some devices (for instance, by
- * Infineon slb9635), so this driver provides access to locality 0 only.
- */
-
-#include <stdlib.h>
-#include <string.h>
-#include <delay.h>
-#include <arch/io.h>
-#include <arch/byteorder.h>
-#include <console/console.h>
-#include <tpm.h>
-#include <arch/early_variables.h>
-
-#define PREFIX "lpc_tpm: "
-
-/* coreboot wrapper for TPM driver (start) */
-#define TPM_DEBUG(fmt, args...) \
- if (CONFIG_DEBUG_TPM) { \
- printk(BIOS_DEBUG, PREFIX); \
- printk(BIOS_DEBUG, fmt , ##args); \
- }
-#define TPM_DEBUG_IO_READ(reg_, val_) \
- TPM_DEBUG("Read reg 0x%x returns 0x%x\n", (reg_), (val_))
-#define TPM_DEBUG_IO_WRITE(reg_, val_) \
- TPM_DEBUG("Write reg 0x%x with 0x%x\n", (reg_), (val_))
-#define printf(x...) printk(BIOS_ERR, x)
-
-#define readb(_a) (*(volatile unsigned char *) (_a))
-#define writeb(_v, _a) (*(volatile unsigned char *) (_a) = (_v))
-#define readl(_a) (*(volatile unsigned long *) (_a))
-#define writel(_v, _a) (*(volatile unsigned long *) (_a) = (_v))
-/* coreboot wrapper for TPM driver (end) */
-
-#ifndef CONFIG_TPM_TIS_BASE_ADDRESS
-/* Base TPM address standard for x86 systems */
-#define CONFIG_TPM_TIS_BASE_ADDRESS 0xfed40000
-#endif
-
-/* the macro accepts the locality value, but only locality 0 is operational */
-#define TIS_REG(LOCALITY, REG) \
- (void *)(CONFIG_TPM_TIS_BASE_ADDRESS + (LOCALITY << 12) + REG)
-
-/* hardware registers' offsets */
-#define TIS_REG_ACCESS 0x0
-#define TIS_REG_INT_ENABLE 0x8
-#define TIS_REG_INT_VECTOR 0xc
-#define TIS_REG_INT_STATUS 0x10
-#define TIS_REG_INTF_CAPABILITY 0x14
-#define TIS_REG_STS 0x18
-#define TIS_REG_BURST_COUNT 0x19
-#define TIS_REG_DATA_FIFO 0x24
-#define TIS_REG_DID_VID 0xf00
-#define TIS_REG_RID 0xf04
-
-/* Some registers' bit field definitions */
-#define TIS_STS_VALID (1 << 7) /* 0x80 */
-#define TIS_STS_COMMAND_READY (1 << 6) /* 0x40 */
-#define TIS_STS_TPM_GO (1 << 5) /* 0x20 */
-#define TIS_STS_DATA_AVAILABLE (1 << 4) /* 0x10 */
-#define TIS_STS_EXPECT (1 << 3) /* 0x08 */
-#define TIS_STS_RESPONSE_RETRY (1 << 1) /* 0x02 */
-
-#define TIS_ACCESS_TPM_REG_VALID_STS (1 << 7) /* 0x80 */
-#define TIS_ACCESS_ACTIVE_LOCALITY (1 << 5) /* 0x20 */
-#define TIS_ACCESS_BEEN_SEIZED (1 << 4) /* 0x10 */
-#define TIS_ACCESS_SEIZE (1 << 3) /* 0x08 */
-#define TIS_ACCESS_PENDING_REQUEST (1 << 2) /* 0x04 */
-#define TIS_ACCESS_REQUEST_USE (1 << 1) /* 0x02 */
-#define TIS_ACCESS_TPM_ESTABLISHMENT (1 << 0) /* 0x01 */
-
-/*
- * Error value returned if a tpm register does not enter the expected state
- * after continuous polling. No actual TPM register reading ever returns ~0,
- * so this value is a safe error indication to be mixed with possible status
- * register values.
- */
-#define TPM_TIMEOUT_ERR (~0)
-
-/* Error value returned on various TPM driver errors */
-#define TPM_DRIVER_ERR (~0)
-
- /* 1 second is plenty for anything TPM does.*/
-#define MAX_DELAY_US (1000 * 1000)
-
-/*
- * Structures defined below allow creating descriptions of TPM vendor/device
- * ID information for run time discovery. The only device the system knows
- * about at this time is Infineon slb9635
- */
-struct device_name {
- u16 dev_id;
- const char * const dev_name;
-};
-
-struct vendor_name {
- u16 vendor_id;
- const char * vendor_name;
- const struct device_name* dev_names;
-};
-
-static const struct device_name atmel_devices[] = {
- {0x3204, "AT97SC3204"},
- {0xffff}
-};
-
-static const struct device_name infineon_devices[] = {
- {0x000b, "SLB9635 TT 1.2"},
- {0xffff}
-};
-
-static const struct device_name nuvoton_devices[] = {
- {0x00fe, "NPCT420AA V2"},
- {0xffff}
-};
-
-static const struct device_name stmicro_devices[] = {
- {0x0000, "ST33ZP24" },
- {0xffff}
-};
-
-static const struct vendor_name vendor_names[] = {
- {0x1114, "Atmel", atmel_devices},
- {0x15d1, "Infineon", infineon_devices},
- {0x1050, "Nuvoton", nuvoton_devices},
- {0x104a, "ST Microelectronics", stmicro_devices},
-};
-
-/*
- * Cached vendor/device ID pair to indicate that the device has been already
- * discovered
- */
-static u32 vendor_dev_id CAR_GLOBAL;
-
-static inline u8 tpm_read_status(int locality)
-{
- u8 value = readb(TIS_REG(locality, TIS_REG_STS));
- TPM_DEBUG_IO_READ(TIS_REG_STS, value);
- return value;
-}
-
-static inline void tpm_write_status(u8 sts, int locality)
-{
- TPM_DEBUG_IO_WRITE(TIS_REG_STS, sts);
- writeb(sts, TIS_REG(locality, TIS_REG_STS));
-}
-
-static inline u8 tpm_read_data(int locality)
-{
- u8 value = readb(TIS_REG(locality, TIS_REG_DATA_FIFO));
- TPM_DEBUG_IO_READ(TIS_REG_DATA_FIFO, value);
- return value;
-}
-
-static inline void tpm_write_data(u8 data, int locality)
-{
- TPM_DEBUG_IO_WRITE(TIS_REG_STS, data);
- writeb(data, TIS_REG(locality, TIS_REG_DATA_FIFO));
-}
-
-static inline u16 tpm_read_burst_count(int locality)
-{
- u16 count;
- count = readb(TIS_REG(locality, TIS_REG_BURST_COUNT));
- count |= readb(TIS_REG(locality, TIS_REG_BURST_COUNT + 1)) << 8;
- TPM_DEBUG_IO_READ(TIS_REG_BURST_COUNT, count);
- return count;
-}
-
-static inline u8 tpm_read_access(int locality)
-{
- u8 value = readb(TIS_REG(locality, TIS_REG_ACCESS));
- TPM_DEBUG_IO_READ(TIS_REG_ACCESS, value);
- return value;
-}
-
-static inline void tpm_write_access(u8 data, int locality)
-{
- TPM_DEBUG_IO_WRITE(TIS_REG_ACCESS, data);
- writeb(data, TIS_REG(locality, TIS_REG_ACCESS));
-}
-
-static inline u32 tpm_read_did_vid(int locality)
-{
- u32 value = readl(TIS_REG(locality, TIS_REG_DID_VID));
- TPM_DEBUG_IO_READ(TIS_REG_DID_VID, value);
- return value;
-}
-
-/*
- * tis_wait_sts()
- *
- * Wait for at least a second for a status to change its state to match the
- * expected state. Normally the transition happens within microseconds.
- *
- * @locality - locality
- * @mask - bitmask for the bitfield(s) to watch
- * @expected - value the field(s) are supposed to be set to
- *
- * Returns 0 on success or TPM_TIMEOUT_ERR on timeout.
- */
-static int tis_wait_sts(int locality, u8 mask, u8 expected)
-{
- u32 time_us = MAX_DELAY_US;
- while (time_us > 0) {
- u8 value = tpm_read_status(locality);
- if ((value & mask) == expected)
- return 0;
- udelay(1); /* 1 us */
- time_us--;
- }
- return TPM_TIMEOUT_ERR;
-}
-
-static inline int tis_wait_ready(int locality)
-{
- return tis_wait_sts(locality, TIS_STS_COMMAND_READY,
- TIS_STS_COMMAND_READY);
-}
-
-static inline int tis_wait_valid(int locality)
-{
- return tis_wait_sts(locality, TIS_STS_VALID, TIS_STS_VALID);
-}
-
-static inline int tis_wait_valid_data(int locality)
-{
- const u8 has_data = TIS_STS_DATA_AVAILABLE | TIS_STS_VALID;
- return tis_wait_sts(locality, has_data, has_data);
-}
-
-static inline int tis_has_valid_data(int locality)
-{
- const u8 has_data = TIS_STS_DATA_AVAILABLE | TIS_STS_VALID;
- return (tpm_read_status(locality) & has_data) == has_data;
-}
-
-static inline int tis_expect_data(int locality)
-{
- return !!(tpm_read_status(locality) & TIS_STS_EXPECT);
-}
-
-/*
- * tis_wait_access()
- *
- * Wait for at least a second for a access to change its state to match the
- * expected state. Normally the transition happens within microseconds.
- *
- * @locality - locality
- * @mask - bitmask for the bitfield(s) to watch
- * @expected - value the field(s) are supposed to be set to
- *
- * Returns 0 on success or TPM_TIMEOUT_ERR on timeout.
- */
-static int tis_wait_access(int locality, u8 mask, u8 expected)
-{
- u32 time_us = MAX_DELAY_US;
- while (time_us > 0) {
- u8 value = tpm_read_access(locality);
- if ((value & mask) == expected)
- return 0;
- udelay(1); /* 1 us */
- time_us--;
- }
- return TPM_TIMEOUT_ERR;
-}
-
-static inline int tis_wait_dropped_access(int locality)
-{
- return tis_wait_access(locality, TIS_ACCESS_ACTIVE_LOCALITY, 0);
-}
-
-static inline int tis_wait_received_access(int locality)
-{
- return tis_wait_access(locality, TIS_ACCESS_ACTIVE_LOCALITY,
- TIS_ACCESS_ACTIVE_LOCALITY);
-}
-
-static inline int tis_has_access(int locality)
-{
- return !!(tpm_read_access(locality) & TIS_ACCESS_ACTIVE_LOCALITY);
-}
-
-static inline void tis_request_access(int locality)
-{
- tpm_write_access(TIS_ACCESS_REQUEST_USE, locality);
-}
-
-static inline void tis_drop_access(int locality)
-{
- tpm_write_access(TIS_ACCESS_ACTIVE_LOCALITY, locality);
-}
-
-/*
- * PC Client Specific TPM Interface Specification section 11.2.12:
- *
- * Software must be prepared to send two writes of a "1" to command ready
- * field: the first to indicate successful read of all the data, thus
- * clearing the data from the ReadFIFO and freeing the TPM's resources,
- * and the second to indicate to the TPM it is about to send a new command.
- *
- * In practice not all TPMs behave the same so it is necessary to be
- * flexible when trying to set command ready.
- *
- * Returns 0 on success if the TPM is ready for transactions.
- * Returns TPM_TIMEOUT_ERR if the command ready bit does not get set.
- */
-static int tis_command_ready(u8 locality)
-{
- u32 status;
-
- /* 1st attempt to set command ready */
- tpm_write_status(TIS_STS_COMMAND_READY, locality);
-
- /* Wait for response */
- status = tpm_read_status(locality);
-
- /* Check if command ready is set yet */
- if (status & TIS_STS_COMMAND_READY)
- return 0;
-
- /* 2nd attempt to set command ready */
- tpm_write_status(TIS_STS_COMMAND_READY, locality);
-
- return tis_wait_ready(locality);
-}
-
-/*
- * Probe the TPM device and try determining its manufacturer/device name.
- *
- * Returns 0 on success (the device is found or was found during an earlier
- * invocation) or TPM_DRIVER_ERR if the device is not found.
- */
-static u32 tis_probe(void)
-{
- const char *device_name = "unknown";
- const char *vendor_name = device_name;
- const struct device_name *dev;
- u32 didvid;
- u16 vid, did;
- int i;
-
- if (car_get_var(vendor_dev_id))
- return 0; /* Already probed. */
-
- didvid = tpm_read_did_vid(0);
- if (!didvid || (didvid == 0xffffffff)) {
- printf("%s: No TPM device found\n", __FUNCTION__);
- return TPM_DRIVER_ERR;
- }
-
- car_set_var(vendor_dev_id, didvid);
-
- vid = didvid & 0xffff;
- did = (didvid >> 16) & 0xffff;
- for (i = 0; i < ARRAY_SIZE(vendor_names); i++) {
- int j = 0;
- u16 known_did;
- if (vid == vendor_names[i].vendor_id) {
- vendor_name = vendor_names[i].vendor_name;
- } else {
- continue;
- }
- dev = &vendor_names[i].dev_names[j];
- while ((known_did = dev->dev_id) != 0xffff) {
- if (known_did == did) {
- device_name = dev->dev_name;
- break;
- }
- j++;
- }
- break;
- }
- /* this will have to be converted into debug printout */
- printf("Found TPM %s by %s\n", device_name, vendor_name);
- return 0;
-}
-
-/*
- * tis_senddata()
- *
- * send the passed in data to the TPM device.
- *
- * @data - address of the data to send, byte by byte
- * @len - length of the data to send
- *
- * Returns 0 on success, TPM_DRIVER_ERR on error (in case the device does
- * not accept the entire command).
- */
-static u32 tis_senddata(const u8 * const data, u32 len)
-{
- u32 offset = 0;
- u16 burst = 0;
- u32 max_cycles = 0;
- u8 locality = 0;
-
- if (tis_wait_ready(locality)) {
- printf("%s:%d - failed to get 'command_ready' status\n",
- __FILE__, __LINE__);
- return TPM_DRIVER_ERR;
- }
- burst = tpm_read_burst_count(locality);
-
- while (1) {
- unsigned count;
-
- /* Wait till the device is ready to accept more data. */
- while (!burst) {
- if (max_cycles++ == MAX_DELAY_US) {
- printf("%s:%d failed to feed %d bytes of %d\n",
- __FILE__, __LINE__, len - offset, len);
- return TPM_DRIVER_ERR;
- }
- udelay(1);
- burst = tpm_read_burst_count(locality);
- }
-
- max_cycles = 0;
-
- /*
- * Calculate number of bytes the TPM is ready to accept in one
- * shot.
- *
- * We want to send the last byte outside of the loop (hence
- * the -1 below) to make sure that the 'expected' status bit
- * changes to zero exactly after the last byte is fed into the
- * FIFO.
- */
- count = min(burst, len - offset - 1);
- while (count--)
- tpm_write_data(data[offset++], locality);
-
- if (tis_wait_valid(locality) || !tis_expect_data(locality)) {
- printf("%s:%d TPM command feed overflow\n",
- __FILE__, __LINE__);
- return TPM_DRIVER_ERR;
- }
-
- burst = tpm_read_burst_count(locality);
- if ((offset == (len - 1)) && burst)
- /*
- * We need to be able to send the last byte to the
- * device, so burst size must be nonzero before we
- * break out.
- */
- break;
- }
-
- /* Send the last byte. */
- tpm_write_data(data[offset++], locality);
-
- /*
- * Verify that TPM does not expect any more data as part of this
- * command.
- */
- if (tis_wait_valid(locality) || tis_expect_data(locality)) {
- printf("%s:%d unexpected TPM status 0x%x\n",
- __FILE__, __LINE__, tpm_read_status(locality));
- return TPM_DRIVER_ERR;
- }
-
- /* OK, sitting pretty, let's start the command execution. */
- tpm_write_status(TIS_STS_TPM_GO, locality);
-
- return 0;
-}
-
-/*
- * tis_readresponse()
- *
- * read the TPM device response after a command was issued.
- *
- * @buffer - address where to read the response, byte by byte.
- * @len - pointer to the size of buffer
- *
- * On success stores the number of received bytes to len and returns 0. On
- * errors (misformatted TPM data or synchronization problems) returns
- * TPM_DRIVER_ERR.
- */
-static u32 tis_readresponse(u8 *buffer, size_t *len)
-{
- u16 burst_count;
- u32 offset = 0;
- u8 locality = 0;
- u32 expected_count = *len;
- int max_cycles = 0;
-
- /* Wait for the TPM to process the command */
- if (tis_wait_valid_data(locality)) {
- printf("%s:%d failed processing command\n", __FILE__, __LINE__);
- return TPM_DRIVER_ERR;
- }
-
- do {
- while ((burst_count = tpm_read_burst_count(locality)) == 0) {
- if (max_cycles++ == MAX_DELAY_US) {
- printf("%s:%d TPM stuck on read\n",
- __FILE__, __LINE__);
- return TPM_DRIVER_ERR;
- }
- udelay(1);
- }
-
- max_cycles = 0;
-
- while (burst_count-- && (offset < expected_count)) {
- buffer[offset++] = tpm_read_data(locality);
- if (offset == 6) {
- /*
- * We got the first six bytes of the reply,
- * let's figure out how many bytes to expect
- * total - it is stored as a 4 byte number in
- * network order, starting with offset 2 into
- * the body of the reply.
- */
- u32 real_length;
- memcpy(&real_length,
- buffer + 2,
- sizeof(real_length));
- expected_count = be32_to_cpu(real_length);
-
- if ((expected_count < offset) ||
- (expected_count > *len)) {
- printf("%s:%d bad response size %d\n",
- __FILE__, __LINE__,
- expected_count);
- return TPM_DRIVER_ERR;
- }
- }
- }
-
- /* Wait for the next portion */
- if (tis_wait_valid(locality)) {
- printf("%s:%d failed to read response\n",
- __FILE__, __LINE__);
- return TPM_DRIVER_ERR;
- }
-
- if (offset == expected_count)
- break; /* We got all we need */
-
- } while (tis_has_valid_data(locality));
-
- /* * Make sure we indeed read all there was. */
- if (tis_has_valid_data(locality)) {
- printf("%s:%d wrong receive status: %x %d bytes left\n",
- __FILE__, __LINE__, tpm_read_status(locality),
- tpm_read_burst_count(locality));
- return TPM_DRIVER_ERR;
- }
-
- /* Tell the TPM that we are done. */
- if (tis_command_ready(locality) == TPM_TIMEOUT_ERR)
- return TPM_DRIVER_ERR;
-
- *len = offset;
- return 0;
-}
-
-/*
- * tis_init()
- *
- * Initialize the TPM device. Returns 0 on success or TPM_DRIVER_ERR on
- * failure (in case device probing did not succeed).
- */
-int tis_init(void)
-{
- if (tis_probe())
- return TPM_DRIVER_ERR;
- return 0;
-}
-
-/*
- * tis_open()
- *
- * Requests access to locality 0 for the caller. After all commands have been
- * completed the caller is supposed to call tis_close().
- *
- * Returns 0 on success, TPM_DRIVER_ERR on failure.
- */
-int tis_open(void)
-{
- u8 locality = 0; /* we use locality zero for everything */
-
- if (tis_close())
- return TPM_DRIVER_ERR;
-
- /* now request access to locality */
- tis_request_access(locality);
-
- /* did we get a lock? */
- if (tis_wait_received_access(locality)) {
- printf("%s:%d - failed to lock locality %d\n",
- __FILE__, __LINE__, locality);
- return TPM_DRIVER_ERR;
- }
-
- /* Certain TPMs seem to need some delay here or they hang... */
- udelay(10);
-
- if (tis_command_ready(locality) == TPM_TIMEOUT_ERR)
- return TPM_DRIVER_ERR;
-
- return 0;
-}
-
-/*
- * tis_close()
- *
- * terminate the current session with the TPM by releasing the locked
- * locality. Returns 0 on success of TPM_DRIVER_ERR on failure (in case lock
- * removal did not succeed).
- */
-int tis_close(void)
-{
- u8 locality = 0;
- if (tis_has_access(locality)) {
- tis_drop_access(locality);
- if (tis_wait_dropped_access(locality)) {
- printf("%s:%d - failed to release locality %d\n",
- __FILE__, __LINE__, locality);
- return TPM_DRIVER_ERR;
- }
- }
- return 0;
-}
-
-/*
- * tis_sendrecv()
- *
- * Send the requested data to the TPM and then try to get its response
- *
- * @sendbuf - buffer of the data to send
- * @send_size size of the data to send
- * @recvbuf - memory to save the response to
- * @recv_len - pointer to the size of the response buffer
- *
- * Returns 0 on success (and places the number of response bytes at recv_len)
- * or TPM_DRIVER_ERR on failure.
- */
-int tis_sendrecv(const uint8_t *sendbuf, size_t send_size,
- uint8_t *recvbuf, size_t *recv_len)
-{
- if (tis_senddata(sendbuf, send_size)) {
- printf("%s:%d failed sending data to TPM\n",
- __FILE__, __LINE__);
- return TPM_DRIVER_ERR;
- }
-
- return tis_readresponse(recvbuf, recv_len);
-}
diff --git a/src/drivers/pc80/tpm/Kconfig b/src/drivers/pc80/tpm/Kconfig
new file mode 100644
index 0000000..fbb3b42
--- /dev/null
+++ b/src/drivers/pc80/tpm/Kconfig
@@ -0,0 +1,7 @@
+config LPC_TPM
+ bool
+ default n
+ help
+ Enable this option to enable LPC TPM support in coreboot.
+
+ If unsure, say N.
diff --git a/src/drivers/pc80/tpm/Makefile.inc b/src/drivers/pc80/tpm/Makefile.inc
new file mode 100644
index 0000000..6f973e1
--- /dev/null
+++ b/src/drivers/pc80/tpm/Makefile.inc
@@ -0,0 +1 @@
+romstage-$(CONFIG_LPC_TPM) += tpm.c
diff --git a/src/drivers/pc80/tpm/tpm.c b/src/drivers/pc80/tpm/tpm.c
new file mode 100644
index 0000000..c0429dd
--- /dev/null
+++ b/src/drivers/pc80/tpm/tpm.c
@@ -0,0 +1,675 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2011 The Chromium OS Authors. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * The code in this file has been heavily based on the article "Writing a TPM
+ * Device Driver" published on http://ptgmedia.pearsoncmg.com and the
+ * submission by Stefan Berger on Qemu-devel mailing list.
+ *
+ * One principal difference is that in the simplest config the other than 0
+ * TPM localities do not get mapped by some devices (for instance, by
+ * Infineon slb9635), so this driver provides access to locality 0 only.
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include <delay.h>
+#include <arch/io.h>
+#include <arch/byteorder.h>
+#include <console/console.h>
+#include <tpm.h>
+#include <arch/early_variables.h>
+
+#define PREFIX "lpc_tpm: "
+
+/* coreboot wrapper for TPM driver (start) */
+#define TPM_DEBUG(fmt, args...) \
+ if (CONFIG_DEBUG_TPM) { \
+ printk(BIOS_DEBUG, PREFIX); \
+ printk(BIOS_DEBUG, fmt , ##args); \
+ }
+#define TPM_DEBUG_IO_READ(reg_, val_) \
+ TPM_DEBUG("Read reg 0x%x returns 0x%x\n", (reg_), (val_))
+#define TPM_DEBUG_IO_WRITE(reg_, val_) \
+ TPM_DEBUG("Write reg 0x%x with 0x%x\n", (reg_), (val_))
+#define printf(x...) printk(BIOS_ERR, x)
+
+#define readb(_a) (*(volatile unsigned char *) (_a))
+#define writeb(_v, _a) (*(volatile unsigned char *) (_a) = (_v))
+#define readl(_a) (*(volatile unsigned long *) (_a))
+#define writel(_v, _a) (*(volatile unsigned long *) (_a) = (_v))
+/* coreboot wrapper for TPM driver (end) */
+
+#ifndef CONFIG_TPM_TIS_BASE_ADDRESS
+/* Base TPM address standard for x86 systems */
+#define CONFIG_TPM_TIS_BASE_ADDRESS 0xfed40000
+#endif
+
+/* the macro accepts the locality value, but only locality 0 is operational */
+#define TIS_REG(LOCALITY, REG) \
+ (void *)(CONFIG_TPM_TIS_BASE_ADDRESS + (LOCALITY << 12) + REG)
+
+/* hardware registers' offsets */
+#define TIS_REG_ACCESS 0x0
+#define TIS_REG_INT_ENABLE 0x8
+#define TIS_REG_INT_VECTOR 0xc
+#define TIS_REG_INT_STATUS 0x10
+#define TIS_REG_INTF_CAPABILITY 0x14
+#define TIS_REG_STS 0x18
+#define TIS_REG_BURST_COUNT 0x19
+#define TIS_REG_DATA_FIFO 0x24
+#define TIS_REG_DID_VID 0xf00
+#define TIS_REG_RID 0xf04
+
+/* Some registers' bit field definitions */
+#define TIS_STS_VALID (1 << 7) /* 0x80 */
+#define TIS_STS_COMMAND_READY (1 << 6) /* 0x40 */
+#define TIS_STS_TPM_GO (1 << 5) /* 0x20 */
+#define TIS_STS_DATA_AVAILABLE (1 << 4) /* 0x10 */
+#define TIS_STS_EXPECT (1 << 3) /* 0x08 */
+#define TIS_STS_RESPONSE_RETRY (1 << 1) /* 0x02 */
+
+#define TIS_ACCESS_TPM_REG_VALID_STS (1 << 7) /* 0x80 */
+#define TIS_ACCESS_ACTIVE_LOCALITY (1 << 5) /* 0x20 */
+#define TIS_ACCESS_BEEN_SEIZED (1 << 4) /* 0x10 */
+#define TIS_ACCESS_SEIZE (1 << 3) /* 0x08 */
+#define TIS_ACCESS_PENDING_REQUEST (1 << 2) /* 0x04 */
+#define TIS_ACCESS_REQUEST_USE (1 << 1) /* 0x02 */
+#define TIS_ACCESS_TPM_ESTABLISHMENT (1 << 0) /* 0x01 */
+
+/*
+ * Error value returned if a tpm register does not enter the expected state
+ * after continuous polling. No actual TPM register reading ever returns ~0,
+ * so this value is a safe error indication to be mixed with possible status
+ * register values.
+ */
+#define TPM_TIMEOUT_ERR (~0)
+
+/* Error value returned on various TPM driver errors */
+#define TPM_DRIVER_ERR (~0)
+
+ /* 1 second is plenty for anything TPM does.*/
+#define MAX_DELAY_US (1000 * 1000)
+
+/*
+ * Structures defined below allow creating descriptions of TPM vendor/device
+ * ID information for run time discovery. The only device the system knows
+ * about at this time is Infineon slb9635
+ */
+struct device_name {
+ u16 dev_id;
+ const char * const dev_name;
+};
+
+struct vendor_name {
+ u16 vendor_id;
+ const char * vendor_name;
+ const struct device_name* dev_names;
+};
+
+static const struct device_name atmel_devices[] = {
+ {0x3204, "AT97SC3204"},
+ {0xffff}
+};
+
+static const struct device_name infineon_devices[] = {
+ {0x000b, "SLB9635 TT 1.2"},
+ {0xffff}
+};
+
+static const struct device_name nuvoton_devices[] = {
+ {0x00fe, "NPCT420AA V2"},
+ {0xffff}
+};
+
+static const struct device_name stmicro_devices[] = {
+ {0x0000, "ST33ZP24" },
+ {0xffff}
+};
+
+static const struct vendor_name vendor_names[] = {
+ {0x1114, "Atmel", atmel_devices},
+ {0x15d1, "Infineon", infineon_devices},
+ {0x1050, "Nuvoton", nuvoton_devices},
+ {0x104a, "ST Microelectronics", stmicro_devices},
+};
+
+/*
+ * Cached vendor/device ID pair to indicate that the device has been already
+ * discovered
+ */
+static u32 vendor_dev_id CAR_GLOBAL;
+
+static inline u8 tpm_read_status(int locality)
+{
+ u8 value = readb(TIS_REG(locality, TIS_REG_STS));
+ TPM_DEBUG_IO_READ(TIS_REG_STS, value);
+ return value;
+}
+
+static inline void tpm_write_status(u8 sts, int locality)
+{
+ TPM_DEBUG_IO_WRITE(TIS_REG_STS, sts);
+ writeb(sts, TIS_REG(locality, TIS_REG_STS));
+}
+
+static inline u8 tpm_read_data(int locality)
+{
+ u8 value = readb(TIS_REG(locality, TIS_REG_DATA_FIFO));
+ TPM_DEBUG_IO_READ(TIS_REG_DATA_FIFO, value);
+ return value;
+}
+
+static inline void tpm_write_data(u8 data, int locality)
+{
+ TPM_DEBUG_IO_WRITE(TIS_REG_STS, data);
+ writeb(data, TIS_REG(locality, TIS_REG_DATA_FIFO));
+}
+
+static inline u16 tpm_read_burst_count(int locality)
+{
+ u16 count;
+ count = readb(TIS_REG(locality, TIS_REG_BURST_COUNT));
+ count |= readb(TIS_REG(locality, TIS_REG_BURST_COUNT + 1)) << 8;
+ TPM_DEBUG_IO_READ(TIS_REG_BURST_COUNT, count);
+ return count;
+}
+
+static inline u8 tpm_read_access(int locality)
+{
+ u8 value = readb(TIS_REG(locality, TIS_REG_ACCESS));
+ TPM_DEBUG_IO_READ(TIS_REG_ACCESS, value);
+ return value;
+}
+
+static inline void tpm_write_access(u8 data, int locality)
+{
+ TPM_DEBUG_IO_WRITE(TIS_REG_ACCESS, data);
+ writeb(data, TIS_REG(locality, TIS_REG_ACCESS));
+}
+
+static inline u32 tpm_read_did_vid(int locality)
+{
+ u32 value = readl(TIS_REG(locality, TIS_REG_DID_VID));
+ TPM_DEBUG_IO_READ(TIS_REG_DID_VID, value);
+ return value;
+}
+
+/*
+ * tis_wait_sts()
+ *
+ * Wait for at least a second for a status to change its state to match the
+ * expected state. Normally the transition happens within microseconds.
+ *
+ * @locality - locality
+ * @mask - bitmask for the bitfield(s) to watch
+ * @expected - value the field(s) are supposed to be set to
+ *
+ * Returns 0 on success or TPM_TIMEOUT_ERR on timeout.
+ */
+static int tis_wait_sts(int locality, u8 mask, u8 expected)
+{
+ u32 time_us = MAX_DELAY_US;
+ while (time_us > 0) {
+ u8 value = tpm_read_status(locality);
+ if ((value & mask) == expected)
+ return 0;
+ udelay(1); /* 1 us */
+ time_us--;
+ }
+ return TPM_TIMEOUT_ERR;
+}
+
+static inline int tis_wait_ready(int locality)
+{
+ return tis_wait_sts(locality, TIS_STS_COMMAND_READY,
+ TIS_STS_COMMAND_READY);
+}
+
+static inline int tis_wait_valid(int locality)
+{
+ return tis_wait_sts(locality, TIS_STS_VALID, TIS_STS_VALID);
+}
+
+static inline int tis_wait_valid_data(int locality)
+{
+ const u8 has_data = TIS_STS_DATA_AVAILABLE | TIS_STS_VALID;
+ return tis_wait_sts(locality, has_data, has_data);
+}
+
+static inline int tis_has_valid_data(int locality)
+{
+ const u8 has_data = TIS_STS_DATA_AVAILABLE | TIS_STS_VALID;
+ return (tpm_read_status(locality) & has_data) == has_data;
+}
+
+static inline int tis_expect_data(int locality)
+{
+ return !!(tpm_read_status(locality) & TIS_STS_EXPECT);
+}
+
+/*
+ * tis_wait_access()
+ *
+ * Wait for at least a second for a access to change its state to match the
+ * expected state. Normally the transition happens within microseconds.
+ *
+ * @locality - locality
+ * @mask - bitmask for the bitfield(s) to watch
+ * @expected - value the field(s) are supposed to be set to
+ *
+ * Returns 0 on success or TPM_TIMEOUT_ERR on timeout.
+ */
+static int tis_wait_access(int locality, u8 mask, u8 expected)
+{
+ u32 time_us = MAX_DELAY_US;
+ while (time_us > 0) {
+ u8 value = tpm_read_access(locality);
+ if ((value & mask) == expected)
+ return 0;
+ udelay(1); /* 1 us */
+ time_us--;
+ }
+ return TPM_TIMEOUT_ERR;
+}
+
+static inline int tis_wait_dropped_access(int locality)
+{
+ return tis_wait_access(locality, TIS_ACCESS_ACTIVE_LOCALITY, 0);
+}
+
+static inline int tis_wait_received_access(int locality)
+{
+ return tis_wait_access(locality, TIS_ACCESS_ACTIVE_LOCALITY,
+ TIS_ACCESS_ACTIVE_LOCALITY);
+}
+
+static inline int tis_has_access(int locality)
+{
+ return !!(tpm_read_access(locality) & TIS_ACCESS_ACTIVE_LOCALITY);
+}
+
+static inline void tis_request_access(int locality)
+{
+ tpm_write_access(TIS_ACCESS_REQUEST_USE, locality);
+}
+
+static inline void tis_drop_access(int locality)
+{
+ tpm_write_access(TIS_ACCESS_ACTIVE_LOCALITY, locality);
+}
+
+/*
+ * PC Client Specific TPM Interface Specification section 11.2.12:
+ *
+ * Software must be prepared to send two writes of a "1" to command ready
+ * field: the first to indicate successful read of all the data, thus
+ * clearing the data from the ReadFIFO and freeing the TPM's resources,
+ * and the second to indicate to the TPM it is about to send a new command.
+ *
+ * In practice not all TPMs behave the same so it is necessary to be
+ * flexible when trying to set command ready.
+ *
+ * Returns 0 on success if the TPM is ready for transactions.
+ * Returns TPM_TIMEOUT_ERR if the command ready bit does not get set.
+ */
+static int tis_command_ready(u8 locality)
+{
+ u32 status;
+
+ /* 1st attempt to set command ready */
+ tpm_write_status(TIS_STS_COMMAND_READY, locality);
+
+ /* Wait for response */
+ status = tpm_read_status(locality);
+
+ /* Check if command ready is set yet */
+ if (status & TIS_STS_COMMAND_READY)
+ return 0;
+
+ /* 2nd attempt to set command ready */
+ tpm_write_status(TIS_STS_COMMAND_READY, locality);
+
+ return tis_wait_ready(locality);
+}
+
+/*
+ * Probe the TPM device and try determining its manufacturer/device name.
+ *
+ * Returns 0 on success (the device is found or was found during an earlier
+ * invocation) or TPM_DRIVER_ERR if the device is not found.
+ */
+static u32 tis_probe(void)
+{
+ const char *device_name = "unknown";
+ const char *vendor_name = device_name;
+ const struct device_name *dev;
+ u32 didvid;
+ u16 vid, did;
+ int i;
+
+ if (car_get_var(vendor_dev_id))
+ return 0; /* Already probed. */
+
+ didvid = tpm_read_did_vid(0);
+ if (!didvid || (didvid == 0xffffffff)) {
+ printf("%s: No TPM device found\n", __FUNCTION__);
+ return TPM_DRIVER_ERR;
+ }
+
+ car_set_var(vendor_dev_id, didvid);
+
+ vid = didvid & 0xffff;
+ did = (didvid >> 16) & 0xffff;
+ for (i = 0; i < ARRAY_SIZE(vendor_names); i++) {
+ int j = 0;
+ u16 known_did;
+ if (vid == vendor_names[i].vendor_id) {
+ vendor_name = vendor_names[i].vendor_name;
+ } else {
+ continue;
+ }
+ dev = &vendor_names[i].dev_names[j];
+ while ((known_did = dev->dev_id) != 0xffff) {
+ if (known_did == did) {
+ device_name = dev->dev_name;
+ break;
+ }
+ j++;
+ }
+ break;
+ }
+ /* this will have to be converted into debug printout */
+ printf("Found TPM %s by %s\n", device_name, vendor_name);
+ return 0;
+}
+
+/*
+ * tis_senddata()
+ *
+ * send the passed in data to the TPM device.
+ *
+ * @data - address of the data to send, byte by byte
+ * @len - length of the data to send
+ *
+ * Returns 0 on success, TPM_DRIVER_ERR on error (in case the device does
+ * not accept the entire command).
+ */
+static u32 tis_senddata(const u8 * const data, u32 len)
+{
+ u32 offset = 0;
+ u16 burst = 0;
+ u32 max_cycles = 0;
+ u8 locality = 0;
+
+ if (tis_wait_ready(locality)) {
+ printf("%s:%d - failed to get 'command_ready' status\n",
+ __FILE__, __LINE__);
+ return TPM_DRIVER_ERR;
+ }
+ burst = tpm_read_burst_count(locality);
+
+ while (1) {
+ unsigned count;
+
+ /* Wait till the device is ready to accept more data. */
+ while (!burst) {
+ if (max_cycles++ == MAX_DELAY_US) {
+ printf("%s:%d failed to feed %d bytes of %d\n",
+ __FILE__, __LINE__, len - offset, len);
+ return TPM_DRIVER_ERR;
+ }
+ udelay(1);
+ burst = tpm_read_burst_count(locality);
+ }
+
+ max_cycles = 0;
+
+ /*
+ * Calculate number of bytes the TPM is ready to accept in one
+ * shot.
+ *
+ * We want to send the last byte outside of the loop (hence
+ * the -1 below) to make sure that the 'expected' status bit
+ * changes to zero exactly after the last byte is fed into the
+ * FIFO.
+ */
+ count = min(burst, len - offset - 1);
+ while (count--)
+ tpm_write_data(data[offset++], locality);
+
+ if (tis_wait_valid(locality) || !tis_expect_data(locality)) {
+ printf("%s:%d TPM command feed overflow\n",
+ __FILE__, __LINE__);
+ return TPM_DRIVER_ERR;
+ }
+
+ burst = tpm_read_burst_count(locality);
+ if ((offset == (len - 1)) && burst)
+ /*
+ * We need to be able to send the last byte to the
+ * device, so burst size must be nonzero before we
+ * break out.
+ */
+ break;
+ }
+
+ /* Send the last byte. */
+ tpm_write_data(data[offset++], locality);
+
+ /*
+ * Verify that TPM does not expect any more data as part of this
+ * command.
+ */
+ if (tis_wait_valid(locality) || tis_expect_data(locality)) {
+ printf("%s:%d unexpected TPM status 0x%x\n",
+ __FILE__, __LINE__, tpm_read_status(locality));
+ return TPM_DRIVER_ERR;
+ }
+
+ /* OK, sitting pretty, let's start the command execution. */
+ tpm_write_status(TIS_STS_TPM_GO, locality);
+
+ return 0;
+}
+
+/*
+ * tis_readresponse()
+ *
+ * read the TPM device response after a command was issued.
+ *
+ * @buffer - address where to read the response, byte by byte.
+ * @len - pointer to the size of buffer
+ *
+ * On success stores the number of received bytes to len and returns 0. On
+ * errors (misformatted TPM data or synchronization problems) returns
+ * TPM_DRIVER_ERR.
+ */
+static u32 tis_readresponse(u8 *buffer, size_t *len)
+{
+ u16 burst_count;
+ u32 offset = 0;
+ u8 locality = 0;
+ u32 expected_count = *len;
+ int max_cycles = 0;
+
+ /* Wait for the TPM to process the command */
+ if (tis_wait_valid_data(locality)) {
+ printf("%s:%d failed processing command\n", __FILE__, __LINE__);
+ return TPM_DRIVER_ERR;
+ }
+
+ do {
+ while ((burst_count = tpm_read_burst_count(locality)) == 0) {
+ if (max_cycles++ == MAX_DELAY_US) {
+ printf("%s:%d TPM stuck on read\n",
+ __FILE__, __LINE__);
+ return TPM_DRIVER_ERR;
+ }
+ udelay(1);
+ }
+
+ max_cycles = 0;
+
+ while (burst_count-- && (offset < expected_count)) {
+ buffer[offset++] = tpm_read_data(locality);
+ if (offset == 6) {
+ /*
+ * We got the first six bytes of the reply,
+ * let's figure out how many bytes to expect
+ * total - it is stored as a 4 byte number in
+ * network order, starting with offset 2 into
+ * the body of the reply.
+ */
+ u32 real_length;
+ memcpy(&real_length,
+ buffer + 2,
+ sizeof(real_length));
+ expected_count = be32_to_cpu(real_length);
+
+ if ((expected_count < offset) ||
+ (expected_count > *len)) {
+ printf("%s:%d bad response size %d\n",
+ __FILE__, __LINE__,
+ expected_count);
+ return TPM_DRIVER_ERR;
+ }
+ }
+ }
+
+ /* Wait for the next portion */
+ if (tis_wait_valid(locality)) {
+ printf("%s:%d failed to read response\n",
+ __FILE__, __LINE__);
+ return TPM_DRIVER_ERR;
+ }
+
+ if (offset == expected_count)
+ break; /* We got all we need */
+
+ } while (tis_has_valid_data(locality));
+
+ /* * Make sure we indeed read all there was. */
+ if (tis_has_valid_data(locality)) {
+ printf("%s:%d wrong receive status: %x %d bytes left\n",
+ __FILE__, __LINE__, tpm_read_status(locality),
+ tpm_read_burst_count(locality));
+ return TPM_DRIVER_ERR;
+ }
+
+ /* Tell the TPM that we are done. */
+ if (tis_command_ready(locality) == TPM_TIMEOUT_ERR)
+ return TPM_DRIVER_ERR;
+
+ *len = offset;
+ return 0;
+}
+
+/*
+ * tis_init()
+ *
+ * Initialize the TPM device. Returns 0 on success or TPM_DRIVER_ERR on
+ * failure (in case device probing did not succeed).
+ */
+int tis_init(void)
+{
+ if (tis_probe())
+ return TPM_DRIVER_ERR;
+ return 0;
+}
+
+/*
+ * tis_open()
+ *
+ * Requests access to locality 0 for the caller. After all commands have been
+ * completed the caller is supposed to call tis_close().
+ *
+ * Returns 0 on success, TPM_DRIVER_ERR on failure.
+ */
+int tis_open(void)
+{
+ u8 locality = 0; /* we use locality zero for everything */
+
+ if (tis_close())
+ return TPM_DRIVER_ERR;
+
+ /* now request access to locality */
+ tis_request_access(locality);
+
+ /* did we get a lock? */
+ if (tis_wait_received_access(locality)) {
+ printf("%s:%d - failed to lock locality %d\n",
+ __FILE__, __LINE__, locality);
+ return TPM_DRIVER_ERR;
+ }
+
+ /* Certain TPMs seem to need some delay here or they hang... */
+ udelay(10);
+
+ if (tis_command_ready(locality) == TPM_TIMEOUT_ERR)
+ return TPM_DRIVER_ERR;
+
+ return 0;
+}
+
+/*
+ * tis_close()
+ *
+ * terminate the current session with the TPM by releasing the locked
+ * locality. Returns 0 on success of TPM_DRIVER_ERR on failure (in case lock
+ * removal did not succeed).
+ */
+int tis_close(void)
+{
+ u8 locality = 0;
+ if (tis_has_access(locality)) {
+ tis_drop_access(locality);
+ if (tis_wait_dropped_access(locality)) {
+ printf("%s:%d - failed to release locality %d\n",
+ __FILE__, __LINE__, locality);
+ return TPM_DRIVER_ERR;
+ }
+ }
+ return 0;
+}
+
+/*
+ * tis_sendrecv()
+ *
+ * Send the requested data to the TPM and then try to get its response
+ *
+ * @sendbuf - buffer of the data to send
+ * @send_size size of the data to send
+ * @recvbuf - memory to save the response to
+ * @recv_len - pointer to the size of the response buffer
+ *
+ * Returns 0 on success (and places the number of response bytes at recv_len)
+ * or TPM_DRIVER_ERR on failure.
+ */
+int tis_sendrecv(const uint8_t *sendbuf, size_t send_size,
+ uint8_t *recvbuf, size_t *recv_len)
+{
+ if (tis_senddata(sendbuf, send_size)) {
+ printf("%s:%d failed sending data to TPM\n",
+ __FILE__, __LINE__);
+ return TPM_DRIVER_ERR;
+ }
+
+ return tis_readresponse(recvbuf, recv_len);
+}
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