PCI: dwc: Move MSI interrupt setup into DWC common code

Platforms using the built-in DWC MSI controller all have a dedicated
interrupt with "msi" name or at index 0, so let's move setting up the
interrupt to the common DWC code.

spear13xx and dra7xx are the 2 oddballs with muxed interrupts, so
we need to prevent configuring the MSI interrupt by setting msi_irq
to negative.

Link: https://lore.kernel.org/r/20201105211159.1814485-9-robh@kernel.org
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Jingoo Han <jingoohan1@gmail.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Kukjin Kim <kgene@kernel.org>
Cc: Krzysztof Kozlowski <krzk@kernel.org>
Cc: Richard Zhu <hongxing.zhu@nxp.com>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: Shawn Guo <shawnguo@kernel.org>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Pengutronix Kernel Team <kernel@pengutronix.de>
Cc: Fabio Estevam <festevam@gmail.com>
Cc: NXP Linux Team <linux-imx@nxp.com>
Cc: Yue Wang <yue.wang@Amlogic.com>
Cc: Kevin Hilman <khilman@baylibre.com>
Cc: Neil Armstrong <narmstrong@baylibre.com>
Cc: Jerome Brunet <jbrunet@baylibre.com>
Cc: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Cc: Jesper Nilsson <jesper.nilsson@axis.com>
Cc: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Cc: Xiaowei Song <songxiaowei@hisilicon.com>
Cc: Binghui Wang <wangbinghui@hisilicon.com>
Cc: Stanimir Varbanov <svarbanov@mm-sol.com>
Cc: Andy Gross <agross@kernel.org>
Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
Cc: Pratyush Anand <pratyush.anand@gmail.com>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Jonathan Hunter <jonathanh@nvidia.com>
Cc: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: linux-samsung-soc@vger.kernel.org
Cc: linux-amlogic@lists.infradead.org
Cc: linux-arm-kernel@axis.com
Cc: linux-arm-msm@vger.kernel.org
Cc: linux-tegra@vger.kernel.org

drivers/pci/controller/dwc/pci-dra7xx.c

@@ -489,6 +489,9 @@ static int __init dra7xx_add_pcie_port(struct dra7xx_pcie *dra7xx,
 	if (pp->irq < 0)
 		return pp->irq;
 
+	/* MSI IRQ is muxed */
+	pp->msi_irq = -ENODEV;
+
 	ret = dra7xx_pcie_init_irq_domain(pp);
 	if (ret < 0)
 		return ret;

drivers/pci/controller/dwc/pci-exynos.c

@@ -415,12 +415,6 @@ static int __init exynos_add_pcie_port(struct exynos_pcie *ep,
 		return ret;
 	}
 
-	if (IS_ENABLED(CONFIG_PCI_MSI)) {
-		pp->msi_irq = platform_get_irq(pdev, 0);
-		if (pp->msi_irq < 0)
-			return pp->msi_irq;
-	}
-
 	pp->ops = &exynos_pcie_host_ops;
 
 	ret = dw_pcie_host_init(pp);

drivers/pci/controller/dwc/pci-imx6.c

@@ -853,12 +853,6 @@ static int imx6_add_pcie_port(struct imx6_pcie *imx6_pcie,
 	struct device *dev = &pdev->dev;
 	int ret;
 
-	if (IS_ENABLED(CONFIG_PCI_MSI)) {
-		pp->msi_irq = platform_get_irq_byname(pdev, "msi");
-		if (pp->msi_irq < 0)
-			return pp->msi_irq;
-	}
-
 	pp->ops = &imx6_pcie_host_ops;
 
 	ret = dw_pcie_host_init(pp);

drivers/pci/controller/dwc/pci-meson.c

@@ -405,12 +405,6 @@ static int meson_add_pcie_port(struct meson_pcie *mp,
 	struct device *dev = &pdev->dev;
 	int ret;
 
-	if (IS_ENABLED(CONFIG_PCI_MSI)) {
-		pp->msi_irq = platform_get_irq(pdev, 0);
-		if (pp->msi_irq < 0)
-			return pp->msi_irq;
-	}
-
 	pp->ops = &meson_pcie_host_ops;
 
 	ret = dw_pcie_host_init(pp);

drivers/pci/controller/dwc/pcie-artpec6.c

@@ -348,12 +348,6 @@ static int artpec6_add_pcie_port(struct artpec6_pcie *artpec6_pcie,
 	struct device *dev = pci->dev;
 	int ret;
 
-	if (IS_ENABLED(CONFIG_PCI_MSI)) {
-		pp->msi_irq = platform_get_irq_byname(pdev, "msi");
-		if (pp->msi_irq < 0)
-			return pp->msi_irq;
-	}
-
 	pp->ops = &artpec6_pcie_host_ops;
 
 	ret = dw_pcie_host_init(pp);

drivers/pci/controller/dwc/pcie-designware-host.c

@@ -373,13 +373,22 @@ int dw_pcie_host_init(struct pcie_port *pp)
 		}
 
 		if (!pp->ops->msi_host_init) {
+			if (!pp->msi_irq) {
+				pp->msi_irq = platform_get_irq_byname_optional(pdev, "msi");
+				if (pp->msi_irq < 0) {
+					pp->msi_irq = platform_get_irq(pdev, 0);
+					if (pp->msi_irq < 0)
+						return pp->msi_irq;
+				}
+			}
+
 			pp->msi_irq_chip = &dw_pci_msi_bottom_irq_chip;
 
 			ret = dw_pcie_allocate_domains(pp);
 			if (ret)
 				return ret;
 
-			if (pp->msi_irq)
+			if (pp->msi_irq > 0)
 				irq_set_chained_handler_and_data(pp->msi_irq,
 							    dw_chained_msi_isr,
 							    pp);

drivers/pci/controller/dwc/pcie-designware-plat.c

@@ -116,12 +116,6 @@ static int dw_plat_add_pcie_port(struct dw_plat_pcie *dw_plat_pcie,
 	if (pp->irq < 0)
 		return pp->irq;
 
-	if (IS_ENABLED(CONFIG_PCI_MSI)) {
-		pp->msi_irq = platform_get_irq(pdev, 0);
-		if (pp->msi_irq < 0)
-			return pp->msi_irq;
-	}
-
 	pp->num_vectors = MAX_MSI_IRQS;
 	pp->ops = &dw_plat_pcie_host_ops;
 

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

@@ -400,12 +400,6 @@ static int histb_pcie_probe(struct platform_device *pdev)
 		return PTR_ERR(hipcie->bus_reset);
 	}
 
-	if (IS_ENABLED(CONFIG_PCI_MSI)) {
-		pp->msi_irq = platform_get_irq_byname(pdev, "msi");
-		if (pp->msi_irq < 0)
-			return pp->msi_irq;
-	}
-
 	hipcie->phy = devm_phy_get(dev, "phy");
 	if (IS_ERR(hipcie->phy)) {
 		dev_info(dev, "no pcie-phy found\n");

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

@@ -439,31 +439,9 @@ static const struct dw_pcie_host_ops kirin_pcie_host_ops = {
 	.host_init = kirin_pcie_host_init,
 };
 
-static int kirin_pcie_add_msi(struct dw_pcie *pci,
-				struct platform_device *pdev)
-{
-	int irq;
-
-	if (IS_ENABLED(CONFIG_PCI_MSI)) {
-		irq = platform_get_irq(pdev, 0);
-		if (irq < 0)
-			return irq;
-
-		pci->pp.msi_irq = irq;
-	}
-
-	return 0;
-}
-
 static int kirin_add_pcie_port(struct dw_pcie *pci,
 			       struct platform_device *pdev)
 {
-	int ret;
-
-	ret = kirin_pcie_add_msi(pci, pdev);
-	if (ret)
-		return ret;
-
 	pci->pp.ops = &kirin_pcie_host_ops;
 
 	return dw_pcie_host_init(&pci->pp);

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

@@ -1424,14 +1424,6 @@ static int qcom_pcie_probe(struct platform_device *pdev)
 
 	pp->ops = &qcom_pcie_dw_ops;
 
-	if (IS_ENABLED(CONFIG_PCI_MSI)) {
-		pp->msi_irq = platform_get_irq_byname(pdev, "msi");
-		if (pp->msi_irq < 0) {
-			ret = pp->msi_irq;
-			goto err_pm_runtime_put;
-		}
-	}
-
 	ret = phy_init(pcie->phy);
 	if (ret) {
 		pm_runtime_disable(&pdev->dev);

drivers/pci/controller/dwc/pcie-spear13xx.c

@@ -185,6 +185,7 @@ static int spear13xx_add_pcie_port(struct spear13xx_pcie *spear13xx_pcie,
 	}
 
 	pp->ops = &spear13xx_pcie_host_ops;
+	pp->msi_irq = -ENODEV;
 
 	ret = dw_pcie_host_init(pp);
 	if (ret) {

drivers/pci/controller/dwc/pcie-tegra194.c

@@ -1554,14 +1554,6 @@ static int tegra_pcie_config_rp(struct tegra_pcie_dw *pcie)
 	char *name;
 	int ret;
 
-	if (IS_ENABLED(CONFIG_PCI_MSI)) {
-		pp->msi_irq = of_irq_get_byname(dev->of_node, "msi");
-		if (!pp->msi_irq) {
-			dev_err(dev, "Failed to get MSI interrupt\n");
-			return -ENODEV;
-		}
-	}
-
 	pm_runtime_enable(dev);
 
 	ret = pm_runtime_get_sync(dev);

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

@@ -341,12 +341,6 @@ static int uniphier_add_pcie_port(struct uniphier_pcie_priv *priv,
 
 	pp->ops = &uniphier_pcie_host_ops;
 
-	if (IS_ENABLED(CONFIG_PCI_MSI)) {
-		pp->msi_irq = platform_get_irq_byname(pdev, "msi");
-		if (pp->msi_irq < 0)
-			return pp->msi_irq;
-	}
-
 	ret = dw_pcie_host_init(pp);
 	if (ret) {
 		dev_err(dev, "Failed to initialize host (%d)\n", ret);