PCI: cadence: Replace private message routing enums with PCI core definitions

The Cadence driver previously defined its own message routing enums (e.g.,
MSG_ROUTING_LOCAL) and message codes, which duplicated existing PCI core
macros (PCIE_MSG_TYPE_R_LOCAL, PCIE_MSG_CODE_ASSERT_INTA, etc.) in
drivers/pci/pci.h. These core definitions align with the PCIe r6.0 spec.

Remove the driver-specific enums and switch to the centralized PCI core
macros. This eliminates redundancy, ensures consistency, and simplifies
future updates. No functional changes are introduced.

Signed-off-by: Hans Zhang <18255117159@163.com>
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Link: https://patch.msgid.link/20250607154913.805027-2-18255117159@163.com

Author: Hans Zhang

drivers/pci/controller/cadence/pcie-cadence-ep.c

@@ -353,7 +353,7 @@ static void cdns_pcie_ep_assert_intx(struct cdns_pcie_ep *ep, u8 fn, u8 intx,
 	}
 	spin_unlock_irqrestore(&ep->lock, flags);
 
-	offset = CDNS_PCIE_NORMAL_MSG_ROUTING(MSG_ROUTING_LOCAL) |
+	offset = CDNS_PCIE_NORMAL_MSG_ROUTING(PCIE_MSG_TYPE_R_LOCAL) |
 		 CDNS_PCIE_NORMAL_MSG_CODE(msg_code);
 	writel(0, ep->irq_cpu_addr + offset);
 }

drivers/pci/controller/cadence/pcie-cadence.h

@@ -250,26 +250,6 @@ struct cdns_pcie_rp_ib_bar {
 
 struct cdns_pcie;
 
-enum cdns_pcie_msg_routing {
-	/* Route to Root Complex */
-	MSG_ROUTING_TO_RC,
-
-	/* Use Address Routing */
-	MSG_ROUTING_BY_ADDR,
-
-	/* Use ID Routing */
-	MSG_ROUTING_BY_ID,
-
-	/* Route as Broadcast Message from Root Complex */
-	MSG_ROUTING_BCAST,
-
-	/* Local message; terminate at receiver (INTx messages) */
-	MSG_ROUTING_LOCAL,
-
-	/* Gather & route to Root Complex (PME_TO_Ack message) */
-	MSG_ROUTING_GATHER,
-};
-
 struct cdns_pcie_ops {
 	int	(*start_link)(struct cdns_pcie *pcie);
 	void	(*stop_link)(struct cdns_pcie *pcie);