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>

diff --git a/drivers/pci/controller/dwc/pcie-kirin.c b/drivers/pci/controller/dwc/pcie-kirin.c
index d2970a0..5352e0c 100644 (file)
--- 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);