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
@@ -2021,6 +2021,7 @@ 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;