PCI: host-generic: Eliminate pci_host_common_probe wrappers

Most ECAM host drivers are just different pci_ecam_ops which can be DT
match table data. That's already the case in some cases, but let's
do that for all the ECAM drivers. Then we can use
of_device_get_match_data() in pci_host_common_probe() and eliminate the
probe wrapper functions and use pci_host_common_probe() directly for
probe.

Link: https://lore.kernel.org/r/20200409234923.21598-4-robh@kernel.org
Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: Zhou Wang <wangzhou1@hisilicon.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Andrew Murray <amurray@thegoodpenguin.co.uk>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Will Deacon <will@kernel.org>
Cc: Robert Richter <rrichter@marvell.com>
Cc: Marc Gonzalez <marc.w.gonzalez@free.fr>
Cc: Mans Rullgard <mans@mansr.com>
Cc: linux-pci@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org

drivers/pci/controller/dwc/pcie-hisi.c

@@ -332,15 +332,6 @@ static struct platform_driver hisi_pcie_driver = {
 };
 builtin_platform_driver(hisi_pcie_driver);
 
-static int hisi_pcie_almost_ecam_probe(struct platform_device *pdev)
-{
-	struct device *dev = &pdev->dev;
-	struct pci_ecam_ops *ops;
-
-	ops = (struct pci_ecam_ops *)of_device_get_match_data(dev);
-	return pci_host_common_probe(pdev, ops);
-}
-
 static int hisi_pcie_platform_init(struct pci_config_window *cfg)
 {
 	struct device *dev = cfg->parent;
@@ -385,7 +376,7 @@ static const struct of_device_id hisi_pcie_almost_ecam_of_match[] = {
 };
 
 static struct platform_driver hisi_pcie_almost_ecam_driver = {
-	.probe  = hisi_pcie_almost_ecam_probe,
+	.probe  = pci_host_common_probe,
 	.driver = {
 		   .name = "hisi-pcie-almost-ecam",
 		   .of_match_table = hisi_pcie_almost_ecam_of_match,

drivers/pci/controller/pci-host-common.c

@@ -10,6 +10,7 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/of_address.h>
+#include <linux/of_device.h>
 #include <linux/of_pci.h>
 #include <linux/pci-ecam.h>
 #include <linux/platform_device.h>
@@ -55,15 +56,19 @@ err_out:
 	return ERR_PTR(err);
 }
 
-int pci_host_common_probe(struct platform_device *pdev,
-			  const struct pci_ecam_ops *ops)
+int pci_host_common_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct pci_host_bridge *bridge;
 	struct pci_config_window *cfg;
 	struct list_head resources;
+	const struct pci_ecam_ops *ops;
 	int ret;
 
+	ops = of_device_get_match_data(&pdev->dev);
+	if (!ops)
+		return -ENODEV;
+
 	bridge = devm_pci_alloc_host_bridge(dev, 0);
 	if (!bridge)
 		return -ENOMEM;

drivers/pci/controller/pci-host-generic.c

@@ -11,8 +11,6 @@
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/module.h>
-#include <linux/of_address.h>
-#include <linux/of_pci.h>
 #include <linux/pci-ecam.h>
 #include <linux/platform_device.h>
 
@@ -79,23 +77,12 @@ static const struct of_device_id gen_pci_of_match[] = {
 };
 MODULE_DEVICE_TABLE(of, gen_pci_of_match);
 
-static int gen_pci_probe(struct platform_device *pdev)
-{
-	const struct of_device_id *of_id;
-	struct pci_ecam_ops *ops;
-
-	of_id = of_match_node(gen_pci_of_match, pdev->dev.of_node);
-	ops = (struct pci_ecam_ops *)of_id->data;
-
-	return pci_host_common_probe(pdev, ops);
-}
-
 static struct platform_driver gen_pci_driver = {
 	.driver = {
 		.name = "pci-host-generic",
 		.of_match_table = gen_pci_of_match,
 	},
-	.probe = gen_pci_probe,
+	.probe = pci_host_common_probe,
 	.remove = pci_host_common_remove,
 };
 module_platform_driver(gen_pci_driver);

drivers/pci/controller/pci-thunder-ecam.c

@@ -357,22 +357,20 @@ const struct pci_ecam_ops pci_thunder_ecam_ops = {
 #ifdef CONFIG_PCI_HOST_THUNDER_ECAM
 
 static const struct of_device_id thunder_ecam_of_match[] = {
-	{ .compatible = "cavium,pci-host-thunder-ecam" },
+	{
+		.compatible = "cavium,pci-host-thunder-ecam",
+		.data = &pci_thunder_ecam_ops,
+	},
 	{ },
 };
 
-static int thunder_ecam_probe(struct platform_device *pdev)
-{
-	return pci_host_common_probe(pdev, &pci_thunder_ecam_ops);
-}
-
 static struct platform_driver thunder_ecam_driver = {
 	.driver = {
 		.name = KBUILD_MODNAME,
 		.of_match_table = thunder_ecam_of_match,
 		.suppress_bind_attrs = true,
 	},
-	.probe = thunder_ecam_probe,
+	.probe = pci_host_common_probe,
 };
 builtin_platform_driver(thunder_ecam_driver);
 

drivers/pci/controller/pci-thunder-pem.c

@@ -451,22 +451,20 @@ static const struct pci_ecam_ops pci_thunder_pem_ops = {
 };
 
 static const struct of_device_id thunder_pem_of_match[] = {
-	{ .compatible = "cavium,pci-host-thunder-pem" },
+	{
+		.compatible = "cavium,pci-host-thunder-pem",
+		.data = &pci_thunder_pem_ops,
+	},
 	{ },
 };
 
-static int thunder_pem_probe(struct platform_device *pdev)
-{
-	return pci_host_common_probe(pdev, &pci_thunder_pem_ops);
-}
-
 static struct platform_driver thunder_pem_driver = {
 	.driver = {
 		.name = KBUILD_MODNAME,
 		.of_match_table = thunder_pem_of_match,
 		.suppress_bind_attrs = true,
 	},
-	.probe = thunder_pem_probe,
+	.probe = pci_host_common_probe,
 };
 builtin_platform_driver(thunder_pem_driver);
 

drivers/pci/controller/pcie-tango.c

@@ -295,11 +295,14 @@ static int tango_pcie_probe(struct platform_device *pdev)
 	spin_lock_init(&pcie->used_msi_lock);
 	irq_set_chained_handler_and_data(virq, tango_msi_isr, pcie);
 
-	return pci_host_common_probe(pdev, &smp8759_ecam_ops);
+	return pci_host_common_probe(pdev);
 }
 
 static const struct of_device_id tango_pcie_ids[] = {
-	{ .compatible = "sigma,smp8759-pcie" },
+	{
+		.compatible = "sigma,smp8759-pcie",
+		.data = &smp8759_ecam_ops,
+	},
 	{ },
 };
 

include/linux/pci-ecam.h

@@ -61,8 +61,7 @@ extern const struct pci_ecam_ops al_pcie_ops;	/* Amazon Annapurna Labs PCIe */
 
 #if IS_ENABLED(CONFIG_PCI_HOST_COMMON)
 /* for DT-based PCI controllers that support ECAM */
-int pci_host_common_probe(struct platform_device *pdev,
-			  const struct pci_ecam_ops *ops);
+int pci_host_common_probe(struct platform_device *pdev);
 int pci_host_common_remove(struct platform_device *pdev);
 #endif
 #endif