PCI: kirin: Add MSI support

Add support for MSI to the kirin host controller driver, based
on the generic dwc infrastructure.

Signed-off-by: Xiaowei Song <songxiaowei@hisilicon.com>
Signed-off-by: Yao Chen <chenyao11@huawei.com>
[lorenzo.pieralisi@arm.com: updated commit log]
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>

1 files changed, 28 insertions, 0 deletions

diff --git a/drivers/pci/controller/dwc/pcie-kirin.c b/drivers/pci/controller/dwc/pcie-kirin.c
index d2970a009eb5..5352e0c3be82 100644
--- a/drivers/pci/controller/dwc/pcie-kirin.c
+++ b/drivers/pci/controller/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 irq;
+
+        if (IS_ENABLED(CONFIG_PCI_MSI)) {
+                irq = platform_get_irq(pdev, 0);
+                if (irq < 0) {
+                        dev_err(&pdev->dev,
+                                "failed to get MSI IRQ (%d)\n", irq);
+                        return irq;
+                }
+
+                pci->pp.msi_irq = irq;
+        }
+
+        return 0;
+}
+
 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)
+                return ret;
+
         pci->pp.ops = &kirin_pcie_host_ops;
 
         return dw_pcie_host_init(&pci->pp);