From b825acb95884acae5e76fe319baf01e9cd64db33 Mon Sep 17 00:00:00 2001
From: Raul E Rangel <rrangel@chromium.org>
Date: Wed, 24 Feb 2021 16:21:00 -0700
Subject: [PATCH] soc/amd/cezanne: Disable legacy DMA IO ports

The legacy DMA is not used by linux. This change frees up those IO
ports.

When FSP-S runs, it re-enables the legacy DMA IO region, so we need to
disable it again.
  BOOTBLOCK: PMx00: 0xe3060bf3
  ROMSTAGE - Before FSP: PMx00: 0xe3060bf3
  ROMSTAGE - After FSP: PMx00: 0xe3060bf7

BUG=b:180949454

Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Change-Id: I7792d1f8ea40eb1c7f6cca67e9907208884ac694
Reviewed-on: https://review.coreboot.org/c/coreboot/+/51076
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
---
 src/soc/amd/cezanne/early_fch.c | 1 +
 src/soc/amd/cezanne/romstage.c  | 4 ++++
 2 files changed, 5 insertions(+)

diff --git a/src/soc/amd/cezanne/early_fch.c b/src/soc/amd/cezanne/early_fch.c
index dd096e05e8..cdb1f12aad 100644
--- a/src/soc/amd/cezanne/early_fch.c
+++ b/src/soc/amd/cezanne/early_fch.c
@@ -17,6 +17,7 @@ void fch_pre_init(void)
 	fch_smbus_init();
 	fch_enable_cf9_io();
 	fch_enable_legacy_io();
+	fch_disable_legacy_dma_io();
 	enable_aoac_devices();
 
 	/*
diff --git a/src/soc/amd/cezanne/romstage.c b/src/soc/amd/cezanne/romstage.c
index 2740d8c74c..b35e6a56af 100644
--- a/src/soc/amd/cezanne/romstage.c
+++ b/src/soc/amd/cezanne/romstage.c
@@ -1,6 +1,7 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
 #include <acpi/acpi.h>
+#include <amdblocks/acpimmio.h>
 #include <amdblocks/memmap.h>
 #include <arch/cpu.h>
 #include <console/console.h>
@@ -31,6 +32,9 @@ asmlinkage void car_stage_entry(void)
 
 	fsp_memory_init(acpi_is_wakeup_s3());
 
+	/* Fixup settings FSP-M should not be changing */
+	fch_disable_legacy_dma_io();
+
 	memmap_stash_early_dram_usage();
 
 	run_ramstage();