diff --git a/arch/ia64/sn/pci/pcibr/pcibr_dma.c b/arch/ia64/sn/pci/pcibr/pcibr_dma.c
index 1ee977fb6ebb..95af40cb22f2 100644
--- a/arch/ia64/sn/pci/pcibr/pcibr_dma.c
+++ b/arch/ia64/sn/pci/pcibr/pcibr_dma.c
@@ -96,10 +96,14 @@ pcibr_dmamap_ate32(struct pcidev_info *info,
 	}
 
 	/*
-	 * If we're mapping for MSI, set the MSI bit in the ATE
+	 * If we're mapping for MSI, set the MSI bit in the ATE.  If it's a
+	 * TIOCP based pci bus, we also need to set the PIO bit in the ATE.
 	 */
-	if (dma_flags & SN_DMA_MSI)
+	if (dma_flags & SN_DMA_MSI) {
 		ate |= PCI32_ATE_MSI;
+		if (IS_TIOCP_SOFT(pcibus_info))
+			ate |= PCI32_ATE_PIO;
+	}
 
 	ate_write(pcibus_info, ate_index, ate_count, ate);
 
diff --git a/include/asm-ia64/sn/pcibr_provider.h b/include/asm-ia64/sn/pcibr_provider.h
index 17cb6cc3f21a..da205b7cdaac 100644
--- a/include/asm-ia64/sn/pcibr_provider.h
+++ b/include/asm-ia64/sn/pcibr_provider.h
@@ -21,6 +21,7 @@
 #define IS_PCI_BRIDGE_ASIC(asic) (asic == PCIIO_ASIC_TYPE_PIC || \
                 asic == PCIIO_ASIC_TYPE_TIOCP)
 #define IS_PIC_SOFT(ps)     (ps->pbi_bridge_type == PCIBR_BRIDGETYPE_PIC)
+#define IS_TIOCP_SOFT(ps)   (ps->pbi_bridge_type == PCIBR_BRIDGETYPE_TIOCP)
 
 
 /*
@@ -53,8 +54,8 @@
  * Bridge PMU Address Transaltion Entry Attibutes
  */
 #define PCI32_ATE_V                     (0x1 << 0)
-#define PCI32_ATE_CO                    (0x1 << 1)
-#define PCI32_ATE_PREC                  (0x1 << 2)
+#define PCI32_ATE_CO                    (0x1 << 1)	/* PIC ASIC ONLY */
+#define PCI32_ATE_PIO                   (0x1 << 1)	/* TIOCP ASIC ONLY */
 #define PCI32_ATE_MSI                   (0x1 << 2)
 #define PCI32_ATE_PREF                  (0x1 << 3)
 #define PCI32_ATE_BAR                   (0x1 << 4)