PCI: dwc: Consolidate args of dw_pcie_prog_outbound_atu() into a structure

This is a preparation before adding the Msg-type outbound iATU
mapping. The respective update will require two more arguments added
to __dw_pcie_prog_outbound_atu(). That will make the already
complicated function prototype even more hard to comprehend accepting
_eight_ arguments.

To prevent that and keep the code more-or-less readable, move all the
outbound iATU-related arguments to a new config structure: struct
dw_pcie_ob_atu_cfg, and pass a pointer to dw_pcie_prog_outbound_atu(). The
structure should be locally defined and populated with the outbound iATU
settings implied by the caller context.

As a result of this change there is no longer need in having the two
distinctive methods for the Host and Endpoint outbound iATU setups since
the code can directly call the dw_pcie_prog_outbound_atu() method with the
config structure populated, so drop dw_pcie_prog_ep_outbound_atu().

[kwilczynski: commit log]
Link: https://lore.kernel.org/linux-pci/20240418-pme_msg-v8-2-a54265c39742@nxp.com
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Reviewed-by: Serge Semin <fancer.lancer@gmail.com>

1 files changed, 11 insertions, 4 deletions

diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index 0e8d46725497..3d728953435b 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -298,6 +298,15 @@ enum dw_pcie_ltssm {
 	DW_PCIE_LTSSM_UNKNOWN = 0xFFFFFFFF,
 };
 
+struct dw_pcie_ob_atu_cfg {
+	int index;
+	int type;
+	u8 func_no;
+	u64 cpu_addr;
+	u64 pci_addr;
+	u64 size;
+};
+
 struct dw_pcie_host_ops {
 	int (*init)(struct dw_pcie_rp *pp);
 	void (*deinit)(struct dw_pcie_rp *pp);
@@ -432,10 +441,8 @@ void dw_pcie_write_dbi2(struct dw_pcie *pci, u32 reg, size_t size, u32 val);
 int dw_pcie_link_up(struct dw_pcie *pci);
 void dw_pcie_upconfig_setup(struct dw_pcie *pci);
 int dw_pcie_wait_for_link(struct dw_pcie *pci);
-int dw_pcie_prog_outbound_atu(struct dw_pcie *pci, int index, int type,
-			      u64 cpu_addr, u64 pci_addr, u64 size);
-int dw_pcie_prog_ep_outbound_atu(struct dw_pcie *pci, u8 func_no, int index,
-				 int type, u64 cpu_addr, u64 pci_addr, u64 size);
+int dw_pcie_prog_outbound_atu(struct dw_pcie *pci,
+			      const struct dw_pcie_ob_atu_cfg *atu);
 int dw_pcie_prog_inbound_atu(struct dw_pcie *pci, int index, int type,
 			     u64 cpu_addr, u64 pci_addr, u64 size);
 int dw_pcie_prog_ep_inbound_atu(struct dw_pcie *pci, u8 func_no, int index,