[S] Change in coreboot[master]: soc/amd/common/iommu.c: Make sure iommu is enabled

[Felix Held (Code Review)]

Felix Held has submitted this change. ( https://review.coreboot.org/c/coreboot/+/75829?usp=email )

Change subject: soc/amd/common/iommu.c: Make sure iommu is enabled
......................................................................

soc/amd/common/iommu.c: Make sure iommu is enabled

Don't rely on vendorcode to set enable bit on IOMMU.

Signed-off-by: Arthur Heymans 
Signed-off-by: Naresh Solanki 
Change-Id: I1805a20656b7fb3915f8cc93c618ee074461840f
Reviewed-on: https://review.coreboot.org/c/coreboot/+/75829
Tested-by: build bot (Jenkins) 
Reviewed-by: Fred Reitberger 
Reviewed-by: Felix Held 
---
M src/soc/amd/common/block/iommu/iommu.c
1 file changed, 14 insertions(+), 1 deletion(-)

Approvals:
  Fred Reitberger: Looks good to me, but someone else must approve
  build bot (Jenkins): Verified
  Felix Held: Looks good to me, approved

diff --git a/src/soc/amd/common/block/iommu/iommu.c b/src/soc/amd/common/block/iommu/iommu.c
index ad1d774..78ec881 100644
--- a/src/soc/amd/common/block/iommu/iommu.c
+++ b/src/soc/amd/common/block/iommu/iommu.c
@@ -1,11 +1,13 @@
 /* SPDX-License-Identifier: GPL-2.0-only */

+#include <console/console.h>
 #include <device/device.h>
 #include <device/pci.h>
 #include <lib.h>

#define IOMMU_CAP_BASE_LO 0x44
 #define IOMMU_CAP_BASE_HI 0x48
+#define IOMMU_ENABLE (1 << 0)

static void iommu_read_resources(struct device *dev)
 {
@@ -23,6 +25,17 @@
    res->flags = IORESOURCE_MEM;
 }

+
+static void iommu_enable_resources(struct device *dev)
+{
+	uint32_t base = pci_read_config32(dev, IOMMU_CAP_BASE_LO);
+	base |= IOMMU_ENABLE;
+	pci_write_config32(dev, IOMMU_CAP_BASE_LO, base);
+	printk(BIOS_DEBUG, "%s -> mmio enable: %08X", __func__,
+	       pci_read_config32(dev, IOMMU_CAP_BASE_LO));
+	pci_dev_enable_resources(dev);
+}
+
 #if CONFIG(HAVE_ACPI_TABLES)
 static const char *iommu_acpi_name(const struct device *dev)
 {
@@ -33,7 +46,7 @@
 struct device_operations amd_iommu_ops = {
    .read_resources = iommu_read_resources,
    .set_resources = pci_dev_set_resources,
-	.enable_resources = pci_dev_enable_resources,
+	.enable_resources = iommu_enable_resources,
    .ops_pci = &pci_dev_ops_pci,
 #if CONFIG(HAVE_ACPI_TABLES)
    .acpi_name = iommu_acpi_name,