From c77259c4e5e02fcf829afe9bf437b70dbddcbf3c Mon Sep 17 00:00:00 2001 From: Vadim Bendebury Date: Tue, 14 Feb 2017 10:48:11 +0800 Subject: google/oak: Support cr50 over I2C on rowan This patch enables TPM2 using cr50 over I2C for the Rowan board, and adds an mt8173 specific TPM IRQ polling function. The function relies on the appropriate EINT input configured to trigger the ready status on the rising edge. The cr50 TPM is on I2C address 0x50. The cr50 interrupt GPIO is also made available for use by depthcharge via the coreboot tables. BRANCH=none BUG=b:36786804 TEST=Boot rowan w/ serial enabled, verify coreboot and depthcharge are configured to use IRQ flow control when talking to the Cr50 TPM. Change-Id: If6cdd0e39e4ac86538f27f322c55c329179ee084 Signed-off-by: Vadim Bendebury Signed-off-by: Daniel Kurtz Reviewed-on: https://review.coreboot.org/19364 Tested-by: build bot (Jenkins) Reviewed-by: Julius Werner --- src/mainboard/google/oak/tpm_tis.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) create mode 100644 src/mainboard/google/oak/tpm_tis.c (limited to 'src/mainboard/google/oak/tpm_tis.c') diff --git a/src/mainboard/google/oak/tpm_tis.c b/src/mainboard/google/oak/tpm_tis.c new file mode 100644 index 0000000000..018f02db10 --- /dev/null +++ b/src/mainboard/google/oak/tpm_tis.c @@ -0,0 +1,24 @@ +/* + * This file is part of the coreboot project. + * + * Copyright 2017 Google Inc. + * + * 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. + */ + +#include +#include + +#include "gpio.h" + +int tis_plat_irq_status(void) +{ + return gpio_eint_poll(CR50_IRQ); +} -- cgit v1.2.3