PCI: designware: Set up high part of MSI target address

Set up the high part of the MSI target address to allow the MSI target to
be above 4GB on 64bit and PAE systems.

[bhelgaas: changelog]
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Pratyush Anand <pratyush.anand@gmail.com>

drivers/pci/host/pcie-designware.c

@@ -205,12 +205,16 @@ irqreturn_t dw_handle_msi_irq(struct pcie_port *pp)
 
 void dw_pcie_msi_init(struct pcie_port *pp)
 {
+	u64 msi_target;
+
 	pp->msi_data = __get_free_pages(GFP_KERNEL, 0);
+	msi_target = virt_to_phys((void *)pp->msi_data);
 
 	/* program the msi_data */
 	dw_pcie_wr_own_conf(pp, PCIE_MSI_ADDR_LO, 4,
-			virt_to_phys((void *)pp->msi_data));
-	dw_pcie_wr_own_conf(pp, PCIE_MSI_ADDR_HI, 4, 0);
+			    (u32)(msi_target & 0xffffffff));
+	dw_pcie_wr_own_conf(pp, PCIE_MSI_ADDR_HI, 4,
+			    (u32)(msi_target >> 32 & 0xffffffff));
 }
 
 static void dw_pcie_msi_clear_irq(struct pcie_port *pp, int irq)
@@ -299,12 +303,15 @@ no_valid_irq:
 static void dw_msi_setup_msg(struct pcie_port *pp, unsigned int irq, u32 pos)
 {
 	struct msi_msg msg;
+	u64 msi_target;
 
 	if (pp->ops->get_msi_addr)
-		msg.address_lo = pp->ops->get_msi_addr(pp);
+		msi_target = pp->ops->get_msi_addr(pp);
 	else
-		msg.address_lo = virt_to_phys((void *)pp->msi_data);
-	msg.address_hi = 0x0;
+		msi_target = virt_to_phys((void *)pp->msi_data);
+
+	msg.address_lo = (u32)(msi_target & 0xffffffff);
+	msg.address_hi = (u32)(msi_target >> 32 & 0xffffffff);
 
 	if (pp->ops->get_msi_data)
 		msg.data = pp->ops->get_msi_data(pp, pos);