Change in coreboot[master]: soc/amd/common/block/acpimmio: Add fch_disable_legacy_dma_io

[Patrick Georgi (Code Review)]

Patrick Georgi has submitted this change. ( https://review.coreboot.org/c/coreboot/+/51075 )

Change subject: soc/amd/common/block/acpimmio: Add fch_disable_legacy_dma_io
......................................................................

soc/amd/common/block/acpimmio: Add fch_disable_legacy_dma_io

Add a method to disable decoding the legacy DMA IO ports.

Signed-off-by: Raul E Rangel 
Signed-off-by: Felix Held 
Change-Id: I979445cfa8317334e62e9ebf12256ece9f8058bf
Reviewed-on: https://review.coreboot.org/c/coreboot/+/51075
Reviewed-by: Angel Pons 
Tested-by: build bot (Jenkins) 
---
M src/soc/amd/common/block/acpimmio/mmio_util.c
M src/soc/amd/common/block/include/amdblocks/acpimmio.h
2 files changed, 9 insertions(+), 0 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  Raul Rangel: Looks good to me, approved
  Angel Pons: Looks good to me, but someone else must approve

diff --git a/src/soc/amd/common/block/acpimmio/mmio_util.c b/src/soc/amd/common/block/acpimmio/mmio_util.c
index 3a86aaf..cfe8779 100644
--- a/src/soc/amd/common/block/acpimmio/mmio_util.c
+++ b/src/soc/amd/common/block/acpimmio/mmio_util.c
@@ -69,6 +69,12 @@
    pm_write32(PM_DECODE_EN, pm_read32(PM_DECODE_EN) | LEGACY_IO_EN);
 }

+void fch_disable_legacy_dma_io(void)
+{
+	pm_write32(PM_DECODE_EN, pm_read32(PM_DECODE_EN) &
+		~(LEGACY_DMA_IO_EN | LEGACY_DMA_IO_80_EN));
+}
+
 void fch_io_enable_legacy_io(void)
 {
    pm_io_write32(PM_DECODE_EN, pm_io_read32(PM_DECODE_EN) | LEGACY_IO_EN);
diff --git a/src/soc/amd/common/block/include/amdblocks/acpimmio.h b/src/soc/amd/common/block/include/amdblocks/acpimmio.h
index a9a6986..7891bfd 100644
--- a/src/soc/amd/common/block/include/amdblocks/acpimmio.h
+++ b/src/soc/amd/common/block/include/amdblocks/acpimmio.h
@@ -22,6 +22,8 @@
 #define   HPET_EN			(1 << 6) /* decode HPET MMIO at 0xfed00000 */
 #define   FCH_IOAPIC_EN			(1 << 5)
 #define   SMBUS_ASF_IO_EN		(1 << 4)
+#define   LEGACY_DMA_IO_80_EN		(1 << 3) /* pass 0x80-0x83 to legacy DMA IO range */
+#define   LEGACY_DMA_IO_EN		(1 << 2)
 #define   CF9_IO_EN			(1 << 1)
 #define   LEGACY_IO_EN			(1 << 0)
 #define PM_RST_STATUS			0xc0
@@ -78,6 +80,7 @@
 void enable_acpimmio_decode_pm04(void);
 void fch_enable_cf9_io(void);
 void fch_enable_legacy_io(void);
+void fch_disable_legacy_dma_io(void);
 void fch_io_enable_legacy_io(void);
 void fch_enable_ioapic_decode(void);
 void fch_configure_hpet(void);