PCI: designware: Add get_msi_data() to pcie_host_ops

Add a struct pcie_host_ops .get_msi_data() method for platforms to return
their special MSI message data.

Signed-off-by: Minghuan Lian <Minghuan.Lian@freescale.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Mohit KUMAR <mohit.kumar@st.com>

drivers/pci/host/pcie-designware.c

@@ -366,7 +366,12 @@ static int dw_msi_setup_irq(struct msi_chip *chip, struct pci_dev *pdev,
 	else
 		msg.address_lo = virt_to_phys((void *)pp->msi_data);
 	msg.address_hi = 0x0;
-	msg.data = pos;
+
+	if (pp->ops->get_msi_data)
+		msg.data = pp->ops->get_msi_data(pp, pos);
+	else
+		msg.data = pos;
+
 	write_msi_msg(irq, &msg);
 
 	return 0;

drivers/pci/host/pcie-designware.h

@@ -71,6 +71,7 @@ struct pcie_host_ops {
 	void (*msi_set_irq)(struct pcie_port *pp, int irq);
 	void (*msi_clear_irq)(struct pcie_port *pp, int irq);
 	u32 (*get_msi_addr)(struct pcie_port *pp);
+	u32 (*get_msi_data)(struct pcie_port *pp, int pos);
 	void (*scan_bus)(struct pcie_port *pp);
 	int (*msi_host_init)(struct pcie_port *pp, struct msi_chip *chip);
 };