diff --git a/src/soc/amd/common/block/include/amdblocks/smn.h b/src/soc/amd/common/block/include/amdblocks/smn.h
index 0268926bbe..ad6972114e 100644
--- a/src/soc/amd/common/block/include/amdblocks/smn.h
+++ b/src/soc/amd/common/block/include/amdblocks/smn.h
@@ -9,4 +9,12 @@ uint32_t smn_read32(uint32_t reg);
 uint64_t smn_read64(uint32_t reg);
 void smn_write32(uint32_t reg, uint32_t val);
 
+#if defined(__SIMPLE_DEVICE__)
+
+uint32_t smn_io_read32(uint32_t reg);
+uint64_t smn_io_read64(uint32_t reg);
+void smn_io_write32(uint32_t reg, uint32_t val);
+
+#endif
+
 #endif /* AMD_BLOCK_SMN_H */
diff --git a/src/soc/amd/common/block/smn/smn.c b/src/soc/amd/common/block/smn/smn.c
index caf6a41004..41396701e2 100644
--- a/src/soc/amd/common/block/smn/smn.c
+++ b/src/soc/amd/common/block/smn/smn.c
@@ -25,3 +25,25 @@ void smn_write32(uint32_t reg, uint32_t val)
 	pci_write_config32(SOC_GNB_DEV, SMN_INDEX_ADDR, reg);
 	pci_write_config32(SOC_GNB_DEV, SMN_DATA_ADDR, val);
 }
+
+
+#if defined(__SIMPLE_DEVICE__)
+
+uint32_t smn_io_read32(uint32_t reg)
+{
+	pci_io_write_config32(SOC_GNB_DEV, SMN_INDEX_ADDR, reg);
+	return pci_io_read_config32(SOC_GNB_DEV, SMN_DATA_ADDR);
+}
+
+uint64_t smn_io_read64(uint32_t reg)
+{
+	return smn_io_read32(reg) | (uint64_t)smn_io_read32(reg + 4) << 32;
+}
+
+void smn_io_write32(uint32_t reg, uint32_t val)
+{
+	pci_io_write_config32(SOC_GNB_DEV, SMN_INDEX_ADDR, reg);
+	pci_io_write_config32(SOC_GNB_DEV, SMN_DATA_ADDR, val);
+}
+
+#endif