[PATCH 4/6] PCI: dwc: rcar-gen4: Add a new function pointer for other SoC support

[Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>]

This driver can reuse other R-Car Gen4 SoC support. However, some
initializing settings differs between r8a779f0 and others. So, add
a new function pointer start_link_enable() to support other R-Car
Gen4 SoC in the future. No behavior changes.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
---
 drivers/pci/controller/dwc/pcie-rcar-gen4.c | 57 +++++++++++++++++++--
 1 file changed, 52 insertions(+), 5 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-rcar-gen4.c b/drivers/pci/controller/dwc/pcie-rcar-gen4.c
index e9166619b1f9..9f4d868c1703 100644
--- a/drivers/pci/controller/dwc/pcie-rcar-gen4.c
+++ b/drivers/pci/controller/dwc/pcie-rcar-gen4.c
@@ -53,9 +53,16 @@ struct rcar_gen4_pcie {
 	void __iomem *base;
 	struct platform_device *pdev;
 	enum dw_pcie_device_mode mode;
+
+	int (*start_link_enable)(struct rcar_gen4_pcie *rcar);
 };
 #define to_rcar_gen4_pcie(_dw)	container_of(_dw, struct rcar_gen4_pcie, dw)
 
+struct rcar_gen4_pcie_platdata {
+	enum dw_pcie_device_mode mode;
+	int (*start_link_enable)(struct rcar_gen4_pcie *rcar);
+};
+
 /* Common */
 static void rcar_gen4_pcie_ltssm_enable(struct rcar_gen4_pcie *rcar,
 					bool enable)
@@ -123,9 +130,13 @@ static int rcar_gen4_pcie_speed_change(struct dw_pcie *dw)
 static int rcar_gen4_pcie_start_link(struct dw_pcie *dw)
 {
 	struct rcar_gen4_pcie *rcar = to_rcar_gen4_pcie(dw);
-	int i, changes;
+	int i, changes, ret;
 
-	rcar_gen4_pcie_ltssm_enable(rcar, true);
+	if (rcar->start_link_enable) {
+		ret = rcar->start_link_enable(rcar);
+		if (ret)
+			return ret;
+	}
 
 	/*
 	 * Require direct speed change with retrying here if the link_gen is
@@ -435,7 +446,10 @@ static void rcar_gen4_remove_dw_pcie_ep(struct rcar_gen4_pcie *rcar)
 /* Common */
 static int rcar_gen4_add_dw_pcie(struct rcar_gen4_pcie *rcar)
 {
-	rcar->mode = (uintptr_t)of_device_get_match_data(&rcar->pdev->dev);
+	const struct rcar_gen4_pcie_platdata *pd = of_device_get_match_data(&rcar->pdev->dev);
+
+	rcar->mode = pd->mode;
+	rcar->start_link_enable = pd->start_link_enable;
 
 	switch (rcar->mode) {
 	case DW_PCIE_RC_TYPE:
@@ -498,14 +512,47 @@ static void rcar_gen4_pcie_remove(struct platform_device *pdev)
 	rcar_gen4_pcie_unprepare(rcar);
 }
 
+static int r8a779f0_pcie_start_link_enable(struct rcar_gen4_pcie *rcar)
+{
+	rcar_gen4_pcie_ltssm_enable(rcar, true);
+
+	return 0;
+}
+
+static struct rcar_gen4_pcie_platdata platdata_r8a779f0_pcie = {
+	.mode = DW_PCIE_RC_TYPE,
+	.start_link_enable = r8a779f0_pcie_start_link_enable,
+};
+
+static struct rcar_gen4_pcie_platdata platdata_r8a779f0_pcie_ep = {
+	.mode = DW_PCIE_EP_TYPE,
+	.start_link_enable = r8a779f0_pcie_start_link_enable,
+};
+
+static struct rcar_gen4_pcie_platdata platdata_rcar_gen4_pcie = {
+	.mode = DW_PCIE_RC_TYPE,
+};
+
+static struct rcar_gen4_pcie_platdata platdata_rcar_gen4_pcie_ep = {
+	.mode = DW_PCIE_EP_TYPE,
+};
+
 static const struct of_device_id rcar_gen4_pcie_of_match[] = {
+	{
+		.compatible = "renesas,r8a779f0-pcie",
+		.data = &platdata_r8a779f0_pcie,
+	},
+	{
+		.compatible = "renesas,r8a779f0-pcie-ep",
+		.data = &platdata_r8a779f0_pcie_ep,
+	},
 	{
 		.compatible = "renesas,rcar-gen4-pcie",
-		.data = (void *)DW_PCIE_RC_TYPE,
+		.data = &platdata_rcar_gen4_pcie,
 	},
 	{
 		.compatible = "renesas,rcar-gen4-pcie-ep",
-		.data = (void *)DW_PCIE_EP_TYPE,
+		.data = &platdata_rcar_gen4_pcie_ep,
 	},
 	{},
 };
-- 
2.25.1