[openwrt/staging/jow.git] /

From dc17fd4b8c27ca47fb5d9113df715579bc4a04a3 Mon Sep 17 00:00:00 2001
From: Po Liu <po.liu@nxp.com>
Date: Fri, 30 Sep 2016 17:11:37 +0800
Subject: [PATCH] pci:add support aer/pme interrupts with none MSI/MSI-X/INTx
 mode

On some platforms, root port doesn't support MSI/MSI-X/INTx in RC mode.
When chip support the aer/pme interrupts 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 <po.liu@nxp.com>
Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
---
 .../devicetree/bindings/pci/layerscape-pci.txt     | 13 +++++--
 arch/arm/kernel/bios32.c                           | 44 ++++++++++++++++++++++
 arch/arm64/kernel/pci.c                            | 44 ++++++++++++++++++++++
 drivers/pci/pcie/portdrv_core.c                    | 29 ++++++++++++++
 include/linux/pci.h                                |  1 +
 5 files changed, 127 insertions(+), 4 deletions(-)

--- a/Documentation/devicetree/bindings/pci/layerscape-pci.txt
+++ b/Documentation/devicetree/bindings/pci/layerscape-pci.txt
@@ -26,8 +26,12 @@ Required properties:
 - reg: base addresses and lengths of the PCIe controller register blocks.
 - 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
+- interrupt-names: It could include the following entries:
+  "aer": Asserted for aer interrupt when chip support the aer interrupt with
+                none MSI/MSI-X/INTx mode,but there is interrupt line for aer.
+  "pme": Asserted for pme interrupt when chip support the pme interrupt with
+                none MSI/MSI-X/INTx mode,but there is interrupt line for pme.
+  ......
 - 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.
@@ -43,8 +47,9 @@ Example:
                reg = <0x00 0x03400000 0x0 0x00010000   /* controller registers */
                       0x40 0x00000000 0x0 0x00002000>; /* configuration space */
                reg-names = "regs", "config";
-               interrupts = <GIC_SPI 177 IRQ_TYPE_LEVEL_HIGH>; /* controller interrupt */
-               interrupt-names = "intr";
+               interrupts = <GIC_SPI 176 IRQ_TYPE_LEVEL_HIGH>, /* aer interrupt */
+                       <GIC_SPI 177 IRQ_TYPE_LEVEL_HIGH>; /* pme interrupt */
+               interrupt-names = "aer", "pme";
                fsl,pcie-scfg = <&scfg 0>;
                #address-cells = <3>;
                #size-cells = <2>;
--- a/arch/arm/kernel/bios32.c
+++ b/arch/arm/kernel/bios32.c
@@ -12,11 +12,14 @@
 #include <linux/slab.h>
 #include <linux/init.h>
 #include <linux/io.h>
+#include <linux/of_irq.h>
 
 #include <asm/mach-types.h>
 #include <asm/mach/map.h>
 #include <asm/mach/pci.h>
 
+#include "../../../drivers/pci/pcie/portdrv.h"
+
 static int debug_pci;
 
 /*
@@ -65,6 +68,47 @@ void pcibios_report_status(u_int status_
 }
 
 /*
+ * Check device tree if the service interrupts are there
+ */
+int pcibios_check_service_irqs(struct pci_dev *dev, int *irqs, int mask)
+{
+       int ret, count = 0;
+       struct device_node *np = NULL;
+
+       if (dev->bus->dev.of_node)
+               np = dev->bus->dev.of_node;
+
+       if (np == NULL)
+               return 0;
+
+       if (!IS_ENABLED(CONFIG_OF_IRQ))
+               return 0;
+
+       /* If root port doesn't support MSI/MSI-X/INTx in RC mode,
+        * request irq for aer
+        */
+       if (mask & PCIE_PORT_SERVICE_AER) {
+               ret = of_irq_get_byname(np, "aer");
+               if (ret > 0) {
+                       irqs[PCIE_PORT_SERVICE_AER_SHIFT] = ret;
+                       count++;
+               }
+       }
+
+       if (mask & PCIE_PORT_SERVICE_PME) {
+               ret = of_irq_get_byname(np, "pme");
+               if (ret > 0) {
+                       irqs[PCIE_PORT_SERVICE_PME_SHIFT] = ret;
+                       count++;
+               }
+       }
+
+       /* TODO: add more service interrupts if there it is in the device tree*/
+
+       return count;
+}
+
+/*
  * We don't use this to fix the device, but initialisation of it.
  * It's not the correct use for this, but it works.
  * Note that the arbiter/ISA bridge appears to be buggy, specifically in
--- a/arch/arm64/kernel/pci.c
+++ b/arch/arm64/kernel/pci.c
@@ -13,11 +13,14 @@
 #include <linux/mm.h>
 #include <linux/of_pci.h>
 #include <linux/of_platform.h>
+#include <linux/of_irq.h>
 #include <linux/pci.h>
 #include <linux/pci-acpi.h>
 #include <linux/pci-ecam.h>
 #include <linux/slab.h>
 
+#include "../../../drivers/pci/pcie/portdrv.h"
+
 #ifdef CONFIG_ACPI
 /*
  * Try to assign the IRQ number when probing a new device
@@ -32,6 +35,47 @@ int pcibios_alloc_irq(struct pci_dev *de
 #endif
 
 /*
+ * Check device tree if the service interrupts are there
+ */
+int pcibios_check_service_irqs(struct pci_dev *dev, int *irqs, int mask)
+{
+       int ret, count = 0;
+       struct device_node *np = NULL;
+
+       if (dev->bus->dev.of_node)
+               np = dev->bus->dev.of_node;
+
+       if (np == NULL)
+               return 0;
+
+       if (!IS_ENABLED(CONFIG_OF_IRQ))
+               return 0;
+
+       /* If root port doesn't support MSI/MSI-X/INTx in RC mode,
+        * request irq for aer
+        */
+       if (mask & PCIE_PORT_SERVICE_AER) {
+               ret = of_irq_get_byname(np, "aer");
+               if (ret > 0) {
+                       irqs[PCIE_PORT_SERVICE_AER_SHIFT] = ret;
+                       count++;
+               }
+       }
+
+       if (mask & PCIE_PORT_SERVICE_PME) {
+               ret = of_irq_get_byname(np, "pme");
+               if (ret > 0) {
+                       irqs[PCIE_PORT_SERVICE_PME_SHIFT] = ret;
+                       count++;
+               }
+       }
+
+       /* TODO: add more service interrupts if there it is in the device tree*/
+
+       return count;
+}
+
+/*
  * raw_pci_read/write - Platform-specific PCI config space access.
  */
 int raw_pci_read(unsigned int domain, unsigned int bus,
--- a/drivers/pci/pcie/portdrv_core.c
+++ b/drivers/pci/pcie/portdrv_core.c
@@ -37,6 +37,20 @@ static void release_pcie_device(struct d
        kfree(to_pcie_device(dev));
 }
 
+/**
+ * pcibios_check_service_irqs - check irqs in the device tree
+ * @dev: PCI Express port to handle
+ * @irqs: Array of irqs to populate
+ * @mask: Bitmask of port capabilities returned by get_port_device_capability()
+ *
+ * Return value: 0 means no service irqs in the device tree
+ *
+ */
+int __weak pcibios_check_service_irqs(struct pci_dev *dev, int *irqs, int mask)
+{
+       return 0;
+}
+
 /*
  * Fill in *pme, *aer, *dpc with the relevant Interrupt Message Numbers if
  * services are enabled in "mask".  Return the number of MSI/MSI-X vectors
@@ -165,10 +179,25 @@ static int pcie_port_enable_irq_vec(stru
 static int pcie_init_service_irqs(struct pci_dev *dev, int *irqs, int mask)
 {
        int ret, i;
+       int irq = -1;
 
        for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++)
                irqs[i] = -1;
 
+       /* Check if some platforms owns independent irq pins for AER/PME etc.
+        * Some platforms may own independent AER/PME interrupts and set
+        * them in the device tree file.
+        */
+       ret = pcibios_check_service_irqs(dev, irqs, mask);
+       if (ret) {
+               if (dev->irq)
+                       irq = dev->irq;
+               for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++)
+                       if (irqs[i] == -1)
+                               irqs[i] = irq;
+               return 0;
+       }
+
        /*
         * If we support PME but can't use MSI/MSI-X for it, we have to
         * fall back to INTx or other interrupts, e.g., a system shared
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -2022,6 +2022,7 @@ static inline void pcibios_penalize_isa_
 int pcibios_alloc_irq(struct pci_dev *dev);
 void pcibios_free_irq(struct pci_dev *dev);
 resource_size_t pcibios_default_alignment(void);
+int pcibios_check_service_irqs(struct pci_dev *dev, int *irqs, int mask);
 
 #ifdef CONFIG_HIBERNATE_CALLBACKS
 extern struct dev_pm_ops pcibios_pm_ops;