drivers: Add I2C TPM driver to coreboot

On ARM platforms the TPM is not attached through LPC but through I2C.
This patch adds an I2C TPM driver that supports the following chips:
 * Infineon SLB9635
 * Infineon SLB9645
In order to select the correct TPM implementation cleanly, CONFIG_TPM
is moved to src/Kconfig and does the correct choice.

Old-Change-Id: I2def0e0f86a869d6fcf56fc4ccab0bc935de2bf1
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: https://chromium-review.googlesource.com/167543
Reviewed-by: ron minnich <rminnich@chromium.org>
(cherry picked from commit b4049a0e96f6335a93877e1e884f9a440487c421)

i2c tpm: Remove mostly useless delay code/tables.

I assume from the code in the TPM driver that the TPM spec defines
different types of delays and timeouts which each have a particular
duration, and that the TPM can tell you how long each type is if you ask
it. There was a large table, some members of a data structure, and a
function or two which managed the timeouts and figured their value for
different operations.  The timeout values for the various "ordinals"
were never set in the vendor specific data structure, however, and
always defaulted to 2 minutes.  Similarly the timeouts a, b, c, and d
were never overridden from their defaults.  This change gets rid of all
the timeout management code and makes the "ordinal" timeout 2 minutes
and the a, b, c, and d timeouts 2 seconds, the larger of the two default
values.

This is a port from depthcharge to coreboot, original change:
https://chromium-review.googlesource.com/#/c/168363/

Signed-off-by: Gabe Black <gabeblack@google.com>
Signed-off-by: Stefan Reinauer <reinauer@google.com>

Old-Change-Id: I79696d6329184ca07f6a1be4f6ca85e1655a7aaf
Reviewed-on: https://chromium-review.googlesource.com/168583
Reviewed-by: Gabe Black <gabeblack@chromium.org>
Tested-by: Stefan Reinauer <reinauer@google.com>
Commit-Queue: Stefan Reinauer <reinauer@google.com>
(cherry picked from commit b22395a73f361c38626911808332a3706b2334fe)

TPM: Stop requesting/releasing the TPM locality.

The locality is requested when the TPM is initialized and released when
it's cleaned up. There's no reason to set it to the same thing again and
restore it back to the same value before and after every transaction.

forward ported from https://chromium-review.googlesource.com/#/c/168400

Old-Change-Id: I291d1f86f220ef0eff6809c6cb00459bf95aa5e0
Signed-off-by: Gabe Black <gabeblack@google.com>
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: https://chromium-review.googlesource.com/168584
Reviewed-by: Gabe Black <gabeblack@chromium.org>
(cherry picked from commit cc866c20c6f936f349d2f1773dd492dca9bbf0c1)

Squashed three commits for the i2c tpm driver.

Change-Id: Ie7a50c50fda8ee986c02de7fe27551666998229d
Signed-off-by: Isaac Christensen <isaac.christensen@se-eng.com>
Reviewed-on: http://review.coreboot.org/6519
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

1 files changed, 156 insertions, 0 deletions

diff --git a/src/drivers/i2c/tpm/tpm.h b/src/drivers/i2c/tpm/tpm.h
new file mode 100644
index 0000000000..daddc591e4
--- /dev/null
+++ b/src/drivers/i2c/tpm/tpm.h
@@ -0,0 +1,156 @@
+/*
+ * Copyright (C) 2011 Infineon Technologies
+ *
+ * Authors:
+ * Peter Huewe <huewe.external@infineon.com>
+ *
+ * Version: 2.1.1
+ *
+ * Description:
+ * Device driver for TCG/TCPA TPM (trusted platform module).
+ * Specifications at www.trustedcomputinggroup.org
+ *
+ * It is based on the Linux kernel driver tpm.c from Leendert van
+ * Dorn, Dave Safford, Reiner Sailer, and Kyleen Hall.
+ *
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#ifndef __DRIVERS_TPM_SLB9635_I2C_TPM_H__
+#define __DRIVERS_TPM_SLB9635_I2C_TPM_H__
+
+#include <stdint.h>
+
+enum tpm_timeout {
+	TPM_TIMEOUT = 1,	/* msecs */
+};
+
+/* Size of external transmit buffer (used in tpm_transmit)*/
+#define TPM_BUFSIZE 4096
+
+/* Index of fields in TPM command buffer */
+#define TPM_CMD_SIZE_BYTE 2
+#define TPM_CMD_ORDINAL_BYTE 6
+
+/* Index of Count field in TPM response buffer */
+#define TPM_RSP_SIZE_BYTE 2
+#define TPM_RSP_RC_BYTE 6
+
+struct tpm_chip;
+
+struct tpm_vendor_specific {
+	const uint8_t req_complete_mask;
+	const uint8_t req_complete_val;
+	const uint8_t req_canceled;
+	int irq;
+	int (*recv)(struct tpm_chip *, uint8_t *, size_t);
+	int (*send)(struct tpm_chip *, uint8_t *, size_t);
+	void (*cancel)(struct tpm_chip *);
+	uint8_t(*status)(struct tpm_chip *);
+	int locality;
+};
+
+struct tpm_chip {
+	int is_open;
+	struct tpm_vendor_specific vendor;
+};
+
+struct tpm_input_header {
+	uint16_t tag;
+	uint32_t length;
+	uint32_t ordinal;
+} __attribute__ ((packed));
+
+struct tpm_output_header {
+	uint16_t tag;
+	uint32_t length;
+	uint32_t return_code;
+} __attribute__ ((packed));
+
+struct timeout_t {
+	uint32_t a;
+	uint32_t b;
+	uint32_t c;
+	uint32_t d;
+} __attribute__ ((packed));
+
+struct duration_t {
+	uint32_t tpm_short;
+	uint32_t tpm_medium;
+	uint32_t tpm_long;
+} __attribute__ ((packed));
+
+typedef union {
+	struct timeout_t timeout;
+	struct duration_t duration;
+} cap_t;
+
+struct tpm_getcap_params_in {
+	uint32_t cap;
+	uint32_t subcap_size;
+	uint32_t subcap;
+} __attribute__ ((packed));
+
+struct tpm_getcap_params_out {
+	uint32_t cap_size;
+	cap_t cap;
+} __attribute__ ((packed));
+
+typedef union {
+	struct tpm_input_header in;
+	struct tpm_output_header out;
+} tpm_cmd_header;
+
+typedef union {
+	struct tpm_getcap_params_out getcap_out;
+	struct tpm_getcap_params_in getcap_in;
+} tpm_cmd_params;
+
+struct tpm_cmd_t {
+	tpm_cmd_header header;
+	tpm_cmd_params params;
+} __attribute__ ((packed));
+
+
+/* ---------- Interface for TPM vendor ------------ */
+
+struct tpm_chip *tpm_register_hardware(const struct tpm_vendor_specific *);
+
+int tpm_vendor_init(unsigned bus, uint32_t dev_addr);
+
+void tpm_vendor_cleanup(struct tpm_chip *chip);
+
+/* ---------- Interface for TDDL ------------------- */
+
+/*
+ * if dev_addr != 0 - redefines TPM device address
+ * Returns < 0 on error, 0 on success.
+ */
+int tpm_open(unsigned bus, uint32_t dev_addr);
+
+void tpm_close(void);
+
+/*
+ * Transmit bufsiz bytes out of buf to TPM and get results back in buf, too.
+ * Returns < 0 on error, 0 on success.
+ */
+ssize_t tpm_transmit(const unsigned char *buf, size_t bufsiz);
+
+#endif /* __DRIVERS_TPM_SLB9635_I2C_TPM_H__ */