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mb/ocp/deltalake: Pull POST complete pin low before booting payload 

Delta Lake uses GPIO pin GPP_B20 for POST complete event,
BIOS needs to pull this pin low for BIC (Bridge IC) to start
reading sensors.

Tested=On Delta Lake oBMC, bic-util slotx --get_gpio to confirm
the pin is low.

Change-Id: I7e05f8a7caead8ee0632af4ff60ccd8b2412b3dd
Signed-off-by: Johnny Lin <johnny_lin@wiwynn.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/43162
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>
This commit is contained in:
Johnny Lin 2020-07-07 12:15:11 +08:00 committed by Patrick Georgi
parent 86acc04d28
commit c8d8777750
1 changed files with 11 additions and 0 deletions
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11
src/mainboard/ocp/deltalake/ramstage.c
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@ -1,8 +1,11 @@
/* SPDX-License-Identifier: GPL-2.0-only */ /* SPDX-License-Identifier: GPL-2.0-only */
#include <console/console.h> #include <console/console.h>
#include <bootstate.h>
#include <drivers/ipmi/ipmi_ops.h> #include <drivers/ipmi/ipmi_ops.h>
#include <drivers/ocp/dmi/ocp_dmi.h> #include <drivers/ocp/dmi/ocp_dmi.h>
#include <gpio.h>
#include <soc/lewisburg_pch_gpio_defs.h>
#include <soc/ramstage.h> #include <soc/ramstage.h>
#include <stdio.h> #include <stdio.h>
@ -92,3 +95,11 @@ struct chip_operations mainboard_ops = {
.enable_dev = mainboard_enable, .enable_dev = mainboard_enable,
.final = mainboard_final, .final = mainboard_final,
}; };
static void pull_post_complete_pin(void *unused)
{
/* Pull Low post complete pin */
gpio_output(GPP_B20, 0);
}
BOOT_STATE_INIT_ENTRY(BS_PAYLOAD_BOOT, BS_ON_ENTRY, pull_post_complete_pin, NULL);