Messages in this thread Patch in this message | | | From | Xiaowei Song <> | Subject | [PATCH v4] PCI: kirin: Add MSI support | Date | Wed, 16 May 2018 09:21:59 +0800 |
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From: Yao Chen <chenyao11@huawei.com>
Add support for MSI.
Signed-off-by: Yao Chen <chenyao11@huawei.com> Cc: Xiaowei Song <songxiaowei@hisilicon.com> --- drivers/pci/dwc/pcie-kirin.c | 51 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+)
diff --git a/drivers/pci/dwc/pcie-kirin.c b/drivers/pci/dwc/pcie-kirin.c index d2970a0..00ca4e5 100644 --- a/drivers/pci/dwc/pcie-kirin.c +++ b/drivers/pci/dwc/pcie-kirin.c @@ -426,9 +426,28 @@ static int kirin_pcie_establish_link(struct pcie_port *pp) return 0; } +static irqreturn_t kirin_pcie_msi_irq_handler(int irq, void *arg) +{ + struct pcie_port *pp = arg; + + return dw_handle_msi_irq(pp); +} + +static void kirin_pcie_msi_init(struct pcie_port *pp) +{ + dw_pcie_msi_init(pp); +} + +static void kirin_pcie_enable_interrupts(struct pcie_port *pp) +{ + if (IS_ENABLED(CONFIG_PCI_MSI)) + kirin_pcie_msi_init(pp); +} + static int kirin_pcie_host_init(struct pcie_port *pp) { kirin_pcie_establish_link(pp); + kirin_pcie_enable_interrupts(pp); return 0; } @@ -445,9 +464,41 @@ 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", + pci->pp.msi_irq); + return ret; + } + + pci->pp.msi_irq = ret; + + ret = devm_request_irq(&pdev->dev, pci->pp.msi_irq, + kirin_pcie_msi_irq_handler, + IRQF_SHARED | IRQF_NO_THREAD, + "kirin_pcie_msi", &pci->pp); + if (ret) + dev_err(&pdev->dev, "failed to request MSI IRQ %d\n", + pci->pp.msi_irq); + } + 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) + return ret; + pci->pp.ops = &kirin_pcie_host_ops; return dw_pcie_host_init(&pci->pp); -- 2.7.3
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