PCI: rockchip-ep: Refactor rockchip_pcie_ep_probe() memory allocations

Introduce the function rockchip_pcie_ep_init_ob_mem() allocate the
outbound memory regions and memory needed for IRQ handling.

These changes tidy up rockchip_pcie_ep_probe().

No functional change.

Link: https://lore.kernel.org/r/20241017015849.190271-9-dlemoal@kernel.org
Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

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

@@ -532,15 +532,66 @@ static const struct of_device_id rockchip_pcie_ep_of_match[] = {
 	{},
 };
 
+static int rockchip_pcie_ep_init_ob_mem(struct rockchip_pcie_ep *ep)
+{
+	struct rockchip_pcie *rockchip = &ep->rockchip;
+	struct device *dev = rockchip->dev;
+	struct pci_epc_mem_window *windows = NULL;
+	int err, i;
+
+	ep->ob_addr = devm_kcalloc(dev, ep->max_regions, sizeof(*ep->ob_addr),
+				   GFP_KERNEL);
+
+	if (!ep->ob_addr)
+		return -ENOMEM;
+
+	windows = devm_kcalloc(dev, ep->max_regions,
+			       sizeof(struct pci_epc_mem_window), GFP_KERNEL);
+	if (!windows)
+		return -ENOMEM;
+
+	for (i = 0; i < ep->max_regions; i++) {
+		windows[i].phys_base = rockchip->mem_res->start + (SZ_1M * i);
+		windows[i].size = SZ_1M;
+		windows[i].page_size = SZ_1M;
+	}
+	err = pci_epc_multi_mem_init(ep->epc, windows, ep->max_regions);
+	devm_kfree(dev, windows);
+
+	if (err < 0) {
+		dev_err(dev, "failed to initialize the memory space\n");
+		return err;
+	}
+
+	ep->irq_cpu_addr = pci_epc_mem_alloc_addr(ep->epc, &ep->irq_phys_addr,
+						  SZ_1M);
+	if (!ep->irq_cpu_addr) {
+		dev_err(dev, "failed to reserve memory space for MSI\n");
+		goto err_epc_mem_exit;
+	}
+
+	ep->irq_pci_addr = ROCKCHIP_PCIE_EP_DUMMY_IRQ_ADDR;
+
+	return 0;
+
+err_epc_mem_exit:
+	pci_epc_mem_exit(ep->epc);
+
+	return err;
+}
+
+static void rockchip_pcie_ep_exit_ob_mem(struct rockchip_pcie_ep *ep)
+{
+	pci_epc_mem_exit(ep->epc);
+}
+
 static int rockchip_pcie_ep_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct rockchip_pcie_ep *ep;
 	struct rockchip_pcie *rockchip;
 	struct pci_epc *epc;
-	size_t max_regions;
-	struct pci_epc_mem_window *windows = NULL;
-	int err, i;
+	int err;
 	u32 cfg_msi, cfg_msix_cp;
 
 	ep = devm_kzalloc(dev, sizeof(*ep), GFP_KERNEL);
@@ -564,10 +615,14 @@ static int rockchip_pcie_ep_probe(struct platform_device *pdev)
 	if (err)
 		return err;
 
-	err = rockchip_pcie_enable_clocks(rockchip);
+	err = rockchip_pcie_ep_init_ob_mem(ep);
 	if (err)
 		return err;
 
+	err = rockchip_pcie_enable_clocks(rockchip);
+	if (err)
+		goto err_exit_ob_mem;
+
 	err = rockchip_pcie_init_port(rockchip);
 	if (err)
 		goto err_disable_clocks;
@@ -576,47 +631,9 @@ static int rockchip_pcie_ep_probe(struct platform_device *pdev)
 	rockchip_pcie_write(rockchip, PCIE_CLIENT_LINK_TRAIN_ENABLE,
 			    PCIE_CLIENT_CONFIG);
 
-	max_regions = ep->max_regions;
-	ep->ob_addr = devm_kcalloc(dev, max_regions, sizeof(*ep->ob_addr),
-				   GFP_KERNEL);
-
-	if (!ep->ob_addr) {
-		err = -ENOMEM;
-		goto err_uninit_port;
-	}
-
 	/* Only enable function 0 by default */
 	rockchip_pcie_write(rockchip, BIT(0), PCIE_CORE_PHY_FUNC_CFG);
 
-	windows = devm_kcalloc(dev, ep->max_regions,
-			       sizeof(struct pci_epc_mem_window), GFP_KERNEL);
-	if (!windows) {
-		err = -ENOMEM;
-		goto err_uninit_port;
-	}
-	for (i = 0; i < ep->max_regions; i++) {
-		windows[i].phys_base = rockchip->mem_res->start + (SZ_1M * i);
-		windows[i].size = SZ_1M;
-		windows[i].page_size = SZ_1M;
-	}
-	err = pci_epc_multi_mem_init(epc, windows, ep->max_regions);
-	devm_kfree(dev, windows);
-
-	if (err < 0) {
-		dev_err(dev, "failed to initialize the memory space\n");
-		goto err_uninit_port;
-	}
-
-	ep->irq_cpu_addr = pci_epc_mem_alloc_addr(epc, &ep->irq_phys_addr,
-						  SZ_1M);
-	if (!ep->irq_cpu_addr) {
-		dev_err(dev, "failed to reserve memory space for MSI\n");
-		err = -ENOMEM;
-		goto err_epc_mem_exit;
-	}
-
-	ep->irq_pci_addr = ROCKCHIP_PCIE_EP_DUMMY_IRQ_ADDR;
-
 	/*
 	 * MSI-X is not supported but the controller still advertises the MSI-X
 	 * capability by default, which can lead to the Root Complex side
@@ -646,10 +663,8 @@ static int rockchip_pcie_ep_probe(struct platform_device *pdev)
 	pci_epc_init_notify(epc);
 
 	return 0;
-err_epc_mem_exit:
-	pci_epc_mem_exit(epc);
-err_uninit_port:
-	rockchip_pcie_deinit_phys(rockchip);
+err_exit_ob_mem:
+	rockchip_pcie_ep_exit_ob_mem(ep);
 err_disable_clocks:
 	rockchip_pcie_disable_clocks(rockchip);
 	return err;