[PATCH 15/16] PCI: samsung: Add structure to hold resource operations

[Shradha Todi]

Some resources might differ based on platforms and we
need platform specific functions to initialize or alter
them. For better code reusibility, making a separate
res_ops which will hold all such function pointers or
other resource specific data.

This patch includes adding function pointer for IRQ
initialization which will help to move common operations for
host init into the probe sequence.

Suggested-by: Pankaj Dubey <pankaj.dubey@xxxxxxxxxxx>
Signed-off-by: Shradha Todi <shradha.t@xxxxxxxxxxx>
---
 drivers/pci/controller/dwc/pci-samsung.c | 26 ++++++++++++++++--------
 1 file changed, 17 insertions(+), 9 deletions(-)

diff --git a/drivers/pci/controller/dwc/pci-samsung.c b/drivers/pci/controller/dwc/pci-samsung.c
index 47ca2a6a545d..01882f2d06c7 100644
--- a/drivers/pci/controller/dwc/pci-samsung.c
+++ b/drivers/pci/controller/dwc/pci-samsung.c
@@ -55,6 +55,7 @@ struct samsung_pcie_pdata {
 	struct pci_ops				*pci_ops;
 	const struct dw_pcie_ops		*dwc_ops;
 	const struct dw_pcie_host_ops		*host_ops;
+	const struct samsung_res_ops		*res_ops;
 };
 
 /*
@@ -77,6 +78,10 @@ struct samsung_pcie {
 	struct regulator_bulk_data	supplies[2];
 };
 
+struct samsung_res_ops {
+	int (*irq_init)(struct samsung_pcie *sp, struct platform_device *pdev);
+};
+
 static int samsung_pcie_init_clk_resources(struct samsung_pcie *sp)
 {
 	struct device *dev = sp->pci.dev;
@@ -276,7 +281,7 @@ static const struct dw_pcie_host_ops exynos_pcie_host_ops = {
 	.host_init = exynos_pcie_host_init,
 };
 
-static int exynos_add_pcie_port(struct samsung_pcie *sp,
+static int exynos_irq_init(struct samsung_pcie *sp,
 				       struct platform_device *pdev)
 {
 	struct dw_pcie *pci = &sp->pci;
@@ -295,15 +300,8 @@ static int exynos_add_pcie_port(struct samsung_pcie *sp,
 		return ret;
 	}
 
-	pp->ops = &exynos_pcie_host_ops;
 	pp->msi_irq[0] = -ENODEV;
 
-	ret = dw_pcie_host_init(pp);
-	if (ret) {
-		dev_err(dev, "failed to initialize host\n");
-		return ret;
-	}
-
 	return 0;
 }
 
@@ -314,6 +312,10 @@ static const struct dw_pcie_ops exynos_dw_pcie_ops = {
 	.start_link = exynos_pcie_start_link,
 };
 
+static const struct samsung_res_ops exynos_res_ops_data = {
+	.irq_init		= exynos_irq_init,
+};
+
 static int samsung_pcie_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
@@ -357,7 +359,12 @@ static int samsung_pcie_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, sp);
 
-	ret = exynos_add_pcie_port(sp, pdev);
+	if (pdata->res_ops->irq_init)
+		pdata->res_ops->irq_init(sp, pdev);
+
+	sp->pci.pp.ops = pdata->host_ops;
+
+	ret = dw_pcie_host_init(&sp->pci.pp);
 	if (ret < 0)
 		goto fail_probe;
 
@@ -428,6 +435,7 @@ static const struct samsung_pcie_pdata exynos_5433_pcie_rc_pdata = {
 	.dwc_ops		= &exynos_dw_pcie_ops,
 	.pci_ops		= &exynos_pci_ops,
 	.host_ops		= &exynos_pcie_host_ops,
+	.res_ops		= &exynos_res_ops_data,
 };
 
 static const struct of_device_id samsung_pcie_of_match[] = {
-- 
2.17.1