diff --git a/src/soc/amd/common/block/acpimmio/mmio_util.c b/src/soc/amd/common/block/acpimmio/mmio_util.c
index edb3882e6f..7fad456106 100644
--- a/src/soc/amd/common/block/acpimmio/mmio_util.c
+++ b/src/soc/amd/common/block/acpimmio/mmio_util.c
@@ -65,7 +65,39 @@ void pm_io_write32(uint8_t reg, uint32_t value)
 	pm_io_write16(reg + sizeof(uint16_t), value & 0xffff);
 }
 
-/* smbus pci read/write - access registers at 0xfed80000 - currently unused */
+#if SUPPORTS_ACPIMMIO_SM_PCI_BASE
+/* smbus pci read/write - access registers at 0xfed80000 */
+
+u8 sm_pci_read8(u8 reg)
+{
+	return read8((void *)(ACPIMMIO_SM_PCI_BASE + reg));
+}
+
+u16 sm_pci_read16(u8 reg)
+{
+	return read16((void *)(ACPIMMIO_SM_PCI_BASE + reg));
+}
+
+u32 sm_pci_read32(u8 reg)
+{
+	return read32((void *)(ACPIMMIO_SM_PCI_BASE + reg));
+}
+
+void sm_pci_write8(u8 reg, u8 value)
+{
+	write8((void *)(ACPIMMIO_SM_PCI_BASE + reg), value);
+}
+
+void sm_pci_write16(u8 reg, u16 value)
+{
+	write16((void *)(ACPIMMIO_SM_PCI_BASE + reg), value);
+}
+
+void sm_pci_write32(u8 reg, u32 value)
+{
+	write32((void *)(ACPIMMIO_SM_PCI_BASE + reg), value);
+}
+#endif
 
 #if SUPPORTS_ACPIMMIO_SMI_BASE
 /* smi read/write - access registers at 0xfed80200 */
diff --git a/src/soc/amd/common/block/include/amdblocks/acpimmio.h b/src/soc/amd/common/block/include/amdblocks/acpimmio.h
index 59ab9e5f4f..ca57cf5dcc 100644
--- a/src/soc/amd/common/block/include/amdblocks/acpimmio.h
+++ b/src/soc/amd/common/block/include/amdblocks/acpimmio.h
@@ -21,6 +21,9 @@
 #include <stdint.h>
 /* iomap.h must indicate if the device uses a block, optional if unused. */
 #include <soc/iomap.h>
+#ifndef SUPPORTS_ACPIMMIO_SM_PCI_BASE
+  #define SUPPORTS_ACPIMMIO_SM_PCI_BASE		0
+#endif
 #ifndef SUPPORTS_ACPIMMIO_SMI_BASE
   #define SUPPORTS_ACPIMMIO_SMI_BASE		0
 #endif
@@ -162,6 +165,14 @@
 /* Enable the AcpiMmio range at 0xfed80000 */
 void enable_acpimmio_decode(void);
 
+/* Access SMBus PCI registers at 0xfed80000 */
+uint8_t sm_pci_read8(uint8_t reg);
+uint16_t sm_pci_read16(uint8_t reg);
+uint32_t sm_pci_read32(uint8_t reg);
+void sm_pci_write8(uint8_t reg, uint8_t value);
+void sm_pci_write16(uint8_t reg, uint16_t value);
+void sm_pci_write32(uint8_t reg, uint32_t value);
+
 /* Access PM registers using IO cycles */
 uint8_t pm_io_read8(uint8_t reg);
 uint16_t pm_io_read16(uint8_t reg);