linux-kernel - [PATCH v6 1/1] PCI: kirin: Add MSI support

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Date:   Wed, 11 Jul 2018 14:57:24 +0800
From:   Xiaowei Song <songxiaowei@...ilicon.com>
To:     <wangbinghui@...ilicon.com>, <bhelgaas@...gle.com>,
        <lorenzo.pieralisi@....com>, <robh+dt@...nel.org>,
        <linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <suzhuangluan@...ilicon.com>, <andy.shevchenko@...il.com>
CC:     <kongfei@...ilicon.com>, <chenyao11@...wei.com>,
        <songxiaowei@...ilicon.com>
Subject: [PATCH v6 1/1] PCI: kirin: Add MSI support

Add support for MSI

Signed-off-by: Xiaowei Song <songxiaowei@...ilicon.com>
Signed-off-by: Yao Chen <chenyao11@...wei.com>
---
 drivers/pci/dwc/pcie-kirin.c | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/drivers/pci/dwc/pcie-kirin.c b/drivers/pci/dwc/pcie-kirin.c
index d2970a009eb5..369bf87d2fff 100644
--- a/drivers/pci/dwc/pcie-kirin.c
+++ b/drivers/pci/dwc/pcie-kirin.c
@@ -430,6 +430,9 @@ static int kirin_pcie_host_init(struct pcie_port *pp)
 {
 	kirin_pcie_establish_link(pp);
 
+	if (IS_ENABLED(CONFIG_PCI_MSI))
+		dw_pcie_msi_init(pp);
+
 	return 0;
 }
 
@@ -445,9 +448,34 @@ 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 ret = 0;
+
+	if (IS_ENABLED(CONFIG_PCI_MSI)) {
+		ret = platform_get_irq(pdev, 0);
+		if (ret < 0) {
+			dev_err(&pdev->dev,
+				"failed to get MSI IRQ (%d)\n", ret);
+			return ret;
+		}
+
+		pci->pp.msi_irq = ret;
+	}
+
+	return ret;
+}
+
 static int __init kirin_add_pcie_port(struct dw_pcie *pci,
 				      struct platform_device *pdev)
 {
+	int ret;
+
+	ret = kirin_pcie_add_msi(pci, pdev);
+	if (ret < 0)
+		return ret;
+
 	pci->pp.ops = &kirin_pcie_host_ops;
 
 	return dw_pcie_host_init(&pci->pp);
-- 
2.11.GIT