From mboxrd@z Thu Jan 1 00:00:00 1970 From: po.liu@nxp.com (Po Liu) Date: Wed, 31 Aug 2016 14:37:22 +0800 Subject: [PATCH v4 2/2] pci:aer: add support aer interrupt with none MSI/MSI-X/INTx mode In-Reply-To: <1472625442-23309-1-git-send-email-po.liu@nxp.com> References: <1465892645-32381-2-git-send-email-po.liu@nxp.com> <1472625442-23309-1-git-send-email-po.liu@nxp.com> Message-ID: <1472625442-23309-2-git-send-email-po.liu@nxp.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On some platforms, root port doesn't support MSI/MSI-X/INTx in RC mode. When chip support the aer interrupt with none MSI/MSI-X/INTx mode, maybe there is interrupt line for aer pme etc. Search the interrupt number in the fdt file. Then fixup the dev->irq with it. Signed-off-by: Po Liu --- Changes for v4: - re-use the patch changes in the root port driver; - add binding information; .../devicetree/bindings/pci/layerscape-pci.txt | 4 +-- drivers/pci/pcie/portdrv_core.c | 31 +++++++++++++++++++--- 2 files changed, 30 insertions(+), 5 deletions(-) diff --git a/Documentation/devicetree/bindings/pci/layerscape-pci.txt b/Documentation/devicetree/bindings/pci/layerscape-pci.txt index 41e9f55..1dfb1da 100644 --- a/Documentation/devicetree/bindings/pci/layerscape-pci.txt +++ b/Documentation/devicetree/bindings/pci/layerscape-pci.txt @@ -19,7 +19,7 @@ Required properties: - interrupts: A list of interrupt outputs of the controller. Must contain an entry for each entry in the interrupt-names property. - interrupt-names: Must include the following entries: - "intr": The interrupt that is asserted for controller interrupts + "aer": The interrupt that is asserted for aer interrupts - fsl,pcie-scfg: Must include two entries. The first entry must be a link to the SCFG device node The second entry must be '0' or '1' based on physical PCIe controller index. @@ -36,7 +36,7 @@ Example: 0x40 0x00000000 0x0 0x00002000>; /* configuration space */ reg-names = "regs", "config"; interrupts = ; /* controller interrupt */ - interrupt-names = "intr"; + interrupt-names = "aer"; fsl,pcie-scfg = <&scfg 0>; #address-cells = <3>; #size-cells = <2>; diff --git a/drivers/pci/pcie/portdrv_core.c b/drivers/pci/pcie/portdrv_core.c index e9270b4..7c4943d 100644 --- a/drivers/pci/pcie/portdrv_core.c +++ b/drivers/pci/pcie/portdrv_core.c @@ -16,6 +16,7 @@ #include #include #include +#include #include "../pci.h" #include "portdrv.h" @@ -200,6 +201,28 @@ static int pcie_port_enable_msix(struct pci_dev *dev, int *vectors, int mask) static int init_service_irqs(struct pci_dev *dev, int *irqs, int mask) { int i, irq = -1; + int ret; + struct device_node *np = NULL; + + for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++) + irqs[i] = 0; + + if (dev->bus->dev.of_node) + np = dev->bus->dev.of_node; + + /* If root port doesn't support MSI/MSI-X/INTx in RC mode, + * request irq for aer + */ + if (IS_ENABLED(CONFIG_OF_IRQ) && np && + (mask & PCIE_PORT_SERVICE_PME)) { + ret = of_irq_get_byname(np, "aer"); + if (ret > 0) { + irqs[PCIE_PORT_SERVICE_AER_SHIFT] = ret; + if (dev->irq) + irq = dev->irq; + goto no_msi; + } + } /* * If MSI cannot be used for PCIe PME or hotplug, we have to use @@ -225,11 +248,13 @@ static int init_service_irqs(struct pci_dev *dev, int *irqs, int mask) irq = dev->irq; no_msi: - for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++) - irqs[i] = irq; + for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++) { + if (!irqs[i]) + irqs[i] = irq; + } irqs[PCIE_PORT_SERVICE_VC_SHIFT] = -1; - if (irq < 0) + if (irq < 0 && irqs[PCIE_PORT_SERVICE_AER_SHIFT] < 0) return -ENODEV; return 0; } -- 2.1.0.27.g96db324