[PATCH u-boot v2019.04-aspeed-openbmc 5/5] aspeed: Add board_late_init to write TPM

[Eddie James]

If there is a TPM in the devicetree, use board_late_init to
extend PCR0 with some invalid digest. The purpose of this is to
prevent later undesired usage of the TPM.

Signed-off-by: Eddie James <eajames at linux.ibm.com>
---
 board/aspeed/evb_ast2600/evb_ast2600.c     | 34 ++++++++++++++++++++++
 configs/ast2600_openbmc_spl_emmc_defconfig |  1 +
 2 files changed, 35 insertions(+)

diff --git a/board/aspeed/evb_ast2600/evb_ast2600.c b/board/aspeed/evb_ast2600/evb_ast2600.c
index 72ecb18c15..e11fc6973d 100644
--- a/board/aspeed/evb_ast2600/evb_ast2600.c
+++ b/board/aspeed/evb_ast2600/evb_ast2600.c
@@ -3,6 +3,11 @@
  * Copyright (C) ASPEED Technology Inc.
  */
 #include <common.h>
+#if defined(CONFIG_TPM_V2)
+#include <dm/uclass.h>
+#include <tpm-common.h>
+#include <tpm-v2.h>
+#endif
 #include <asm/io.h>
 
 #define SCU_BASE	0x1e6e2000
@@ -122,6 +127,35 @@ static void __maybe_unused espi_init(void)
 	writel(reg, ESPI_BASE + 0x000);
 }
 
+__weak int board_late_init(void)
+{
+#if defined(CONFIG_TPM_V2)
+	int rc;
+	struct udevice *dev;
+	unsigned char digest[32] = {
+		0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x00, 0x01,
+		0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,
+		0xa0, 0xb1, 0xc2, 0xd3, 0xe4, 0xf5, 0x06, 0x17,
+		0x28, 0x39, 0x4a, 0x5b, 0x6c, 0x7d, 0x8e, 0x9f
+	};
+
+	rc = uclass_first_device_err(UCLASS_TPM, &dev);
+	if (rc)
+		return 0;
+
+	rc = tpm_init(dev);
+	if (rc)
+		return 0;
+
+	rc = tpm2_startup(dev, TPM2_SU_CLEAR);
+	if (rc)
+		return 0;
+
+	tpm2_pcr_extend(dev, 0, digest);
+#endif
+	return 0;
+}
+
 int board_early_init_f(void)
 {
 #if 0
diff --git a/configs/ast2600_openbmc_spl_emmc_defconfig b/configs/ast2600_openbmc_spl_emmc_defconfig
index 3bb44280c7..b506bc5e55 100644
--- a/configs/ast2600_openbmc_spl_emmc_defconfig
+++ b/configs/ast2600_openbmc_spl_emmc_defconfig
@@ -39,6 +39,7 @@ CONFIG_SYS_CONSOLE_ENV_OVERWRITE=y
 CONFIG_DISPLAY_BOARDINFO_LATE=y
 CONFIG_ARCH_EARLY_INIT_R=y
 CONFIG_BOARD_EARLY_INIT_F=y
+CONFIG_BOARD_LATE_INIT=y
 CONFIG_SPL_BOARD_INIT=y
 # CONFIG_SPL_LEGACY_IMAGE_SUPPORT is not set
 CONFIG_SPL_SYS_MALLOC_SIMPLE=y
-- 
2.27.0