cr50: tpm2: pull in the tpm2 library sources

This patch syncs up TPM2 sources into the build area when building
cr50 image. This relies on a specific directory layout so that the ec
makefile has access to the tpm2 source tree.

The sources are copied using rsync, the tpm2 library is a dependency
for the RO/RW elf images, and is declared to be a phony make target,
which guarantees that the tpm2 make is always run when cr50 image is
built.

Include files in board/cr50/tpm2 are necessary to be able to build
tpm2 code using the bare metal toolchain used for building ec code.
memory.h is in fact empty, it is easier to add it here than to wrap it
in conditional compilation at the source.

Make variables CROSS_COMPILE and CFLAGS are exported for the benefit
of the tpm2 makefile. ROOTDIR indicates where tpm2 library should look
for .h files not available from the toolchain.

CQ-DEPEND=CL:292946
BRANCH=none
BUG=chrome-os-partner:43025
TEST=make buildall -j succeeds;
     when linked with the latest tpm2 source, the combined image
     starts the tmp task and reacts to the host sending the startup
     command (failing due to unplugged stubs).

Change-Id: Ia3fd260588558c2bacd724df9583052fa4660ca3
Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/292975
Reviewed-by: Bill Richardson <wfrichar@chromium.org>

Makefile

@@ -192,5 +192,5 @@ libsharedobjs_elf-$(CONFIG_SHAREDLIB) := \
 libsharedobjs: $(libsharedobjs-y)
 
 include Makefile.rules
-
+export CROSS_COMPILE CFLAGS
 endif # SYMLINK

board/cr50/build.mk

@@ -10,6 +10,20 @@ CHIP_FAMILY:=cr50
 CHIP_VARIANT ?= cr50_fpga
 
 board-y=board.o
+LDFLAGS_EXTRA += -L$(out)/tpm2/build -ltpm2
 
 # Need to generate a .hex file
 all: hex
+
+ifeq ($(BOARD_MK_INCLUDED),)
+BOARD_MK_INCLUDED=1
+
+$(out)/RO/ec.RO.elf: $(out)/tpm2/build/libtpm2.a
+$(out)/RW/ec.RW.elf: $(out)/tpm2/build/libtpm2.a
+
+.PHONY: $(out)/tpm2/build/libtpm2.a
+$(out)/tpm2/build/libtpm2.a:
+	rsync -a ../../third_party/tpm2 $(out)
+	$(MAKE) ROOTDIR=$(realpath board/$(BOARD)/tpm2) EMBEDDED_MODE=1 \
+	 -C $(out)/tpm2
+endif

board/cr50/tpm2/endian.h

@@ -0,0 +1,48 @@
+/* Copyright 2015 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef __EC_BOARD_CR50_TPM2_ENDIAN_H
+#define __EC_BOARD_CR50_TPM2_ENDIAN_H
+
+#include <stddef.h>
+#include <stdint.h>
+
+static inline void swap_n(void *in, void *out, size_t size)
+{
+	int i;
+
+	for (i = 0; i < size; i++)
+		((uint8_t *)out)[size - i - 1] = ((uint8_t *)in)[i];
+}
+
+static inline uint16_t be16toh(uint16_t in)
+{
+	uint16_t out;
+
+	swap_n(&in, &out, sizeof(out));
+	return out;
+}
+
+static inline uint32_t be32toh(uint32_t in)
+{
+	uint32_t out;
+
+	swap_n(&in, &out, sizeof(out));
+	return out;
+}
+
+static inline uint64_t be64toh(uint64_t in)
+{
+	uint64_t out;
+
+	swap_n(&in, &out, sizeof(out));
+	return out;
+}
+
+#define htobe16 be16toh
+#define htobe32 be32toh
+#define htobe64 be64toh
+
+#endif /* __EC_BOARD_CR50_TPM2_ENDIAN_H */

board/cr50/tpm2/memory.h

@@ -0,0 +1,11 @@
+/* Copyright 2015 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef __EC_BOARD_CR50_TPM2_MEMORY_H
+#define __EC_BOARD_CR50_TPM2_MEMORY_H
+
+/* An empty file to meet expectations of the tpm2 library. */
+
+#endif /* __EC_BOARD_CR50_TPM2_MEMORY_H */

chip/g/config_chip.h

@@ -14,7 +14,7 @@
 
 /* Describe the RAM layout */
 #define CONFIG_RAM_BASE         0x10000
-#define CONFIG_RAM_SIZE         0x8000
+#define CONFIG_RAM_SIZE         0x10000
 
 /* Flash chip specifics */
 /* TODO(crosbug.com/p/33815): These are probably wrong. Don't use them yet. */
@@ -27,7 +27,7 @@
 /* TODO(wfrichar): Lying about this, so image signing works.
  * I'll file a bug once this CL goes in. */
 /* #define CONFIG_FLASH_PHYSICAL_SIZE (512 * 1024) */
-#define CONFIG_FLASH_PHYSICAL_SIZE (256 * 1024)
+#define CONFIG_FLASH_PHYSICAL_SIZE (512 * 1024)
 
 /* Compute the rest of the flash params from these */
 #include "config_std_internal_flash.h"

common/tpm_registers.c

@@ -16,6 +16,11 @@
 #include "tpm_registers.h"
 #include "util.h"
 
+/* TPM2 library includes. */
+#include "tpm2/ExecCommand_fp.h"
+#include "tpm2/Platform.h"
+#include "tpm2/_TPM_Init_fp.h"
+
 #define CPRINTS(format, args...) cprints(CC_TPM, format, ## args)
 #define CPRINTF(format, args...) cprintf(CC_TPM, format, ## args)
 
@@ -371,7 +376,12 @@ static void tpm_init(void)
 	tpm_.state = tpm_state_idle;
 	tpm_.regs.access = tpm_reg_valid_sts;
 	tpm_.regs.sts = (tpm_family_tpm2 << tpm_family_shift) |
-		(64 << burst_count_shift);
+		(64 << burst_count_shift) | sts_valid;
+
+	/* TPM2 library functions. */
+	_plat__Signal_PowerOn();
+	_TPM_Init();
+	_plat__SetNvAvail();
 }
 
 void tpm_task(void)
@@ -379,11 +389,17 @@ void tpm_task(void)
 	tpm_init();
 	sps_tpm_enable();
 	while (1) {
+		uint8_t *response;
+		unsigned response_size;
+
 		/* Wait for the next command event */
 		task_wait_event(-1);
 		CPRINTF("%s: received fifo command 0x%04x\n",
 			__func__, be32_to_cpu(tpm_.regs.data_fifo + 6));
 
+		ExecuteCommand(tpm_.fifo_write_index,
+			       tpm_.regs.data_fifo,
+			       &response_size,
+			       &response);
 	}
 }
-