Keystone PCI hardware generates error interrupts at RC using platform irq instead of standard msi/legacy irq. Add a simple error handler that logs the fatal interrupt status to the console. Signed-off-by: Murali Karicheri <m-karicheri2@xxxxxx> Cc: Rob Herring <robh+dt@xxxxxxxxxx> Cc: Pawel Moll <pawel.moll@xxxxxxx> Cc: Mark Rutland <mark.rutland@xxxxxxx> Cc: Ian Campbell <ijc+devicetree@xxxxxxxxxxxxxx> Cc: Kumar Gala <galak@xxxxxxxxxxxxxx> Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx> --- .../devicetree/bindings/pci/pci-keystone.txt | 1 + drivers/pci/host/pci-keystone-dw.c | 46 ++++++++++++++++++++++ drivers/pci/host/pci-keystone.c | 32 +++++++++++++++ drivers/pci/host/pci-keystone.h | 6 +++ 4 files changed, 85 insertions(+) diff --git a/Documentation/devicetree/bindings/pci/pci-keystone.txt b/Documentation/devicetree/bindings/pci/pci-keystone.txt index 54eae29..d08a4d5 100644 --- a/Documentation/devicetree/bindings/pci/pci-keystone.txt +++ b/Documentation/devicetree/bindings/pci/pci-keystone.txt @@ -56,6 +56,7 @@ Optional properties:- phy-names: name of the Generic Keystine SerDes phy for PCI - If boot loader already does PCI link establishment, then phys and phy-names shouldn't be present. + interrupts: platform interrupt for error interrupts. Designware DT Properties not applicable for Keystone PCI diff --git a/drivers/pci/host/pci-keystone-dw.c b/drivers/pci/host/pci-keystone-dw.c index ed34c95..524901d 100644 --- a/drivers/pci/host/pci-keystone-dw.c +++ b/drivers/pci/host/pci-keystone-dw.c @@ -53,6 +53,29 @@ #define IRQ_STATUS 0x184 #define MSI_IRQ_OFFSET 4 +/* + * error IRQ bits. Enable following errors + * - ERR_AER - ECRC error - BIT(5) + * - ERR_AXI - AXI tag lookup fatal error BIT(4) + * - ERR_CORR - Correctable error BIT(3) + * - ERR_NONFATAL - Non fatal error BIT(2) + * - ERR_FATAL - Fatal error BIT(1) + * - ERR_SYS - System error (fatal, nonfatal or correctable error) + */ +#define ERR_AER BIT(5) +#define ERR_AXI BIT(4) +#define ERR_CORR BIT(3) +#define ERR_NONFATAL BIT(2) +#define ERR_FATAL BIT(1) +#define ERR_SYS BIT(0) +#define ERR_IRQ_ALL (ERR_AER | ERR_AXI | ERR_CORR | \ + ERR_NONFATAL | ERR_FATAL | ERR_SYS) +#define ERR_FATAL_IRQ (ERR_FATAL | ERR_AXI) +#define ERR_IRQ_STATUS_RAW 0x1c0 +#define ERR_IRQ_STATUS 0x1c4 +#define ERR_IRQ_ENABLE_SET 0x1c8 +#define ERR_IRQ_ENABLE_CLR 0x1cc + /* Config space registers */ #define DEBUG0 0x728 @@ -248,6 +271,29 @@ void ks_dw_pcie_handle_legacy_irq(struct keystone_pcie *ks_pcie, int offset) writel(offset, ks_pcie->va_app_base + IRQ_EOI); } +void ks_dw_pcie_enable_error_irq(void __iomem *reg_base) +{ + writel(ERR_IRQ_ALL, reg_base + ERR_IRQ_ENABLE_SET); +} + +bool ks_dw_pcie_handle_error_irq(struct device *dev, void __iomem *reg_base) +{ + u32 status; + bool ret = false; + + status = readl(reg_base + ERR_IRQ_STATUS_RAW) & ERR_IRQ_ALL; + if (status) { + /* The PCIESS interrupt status buts are "write 1 to clear" */ + if (status & ERR_FATAL_IRQ) + dev_err(dev, "PCIE fatal error detected\n"); + + /* ack the irq event. */ + writel(status, reg_base + ERR_IRQ_STATUS); + ret = true; + } + return ret; +} + static void ks_dw_pcie_ack_legacy_irq(struct irq_data *d) { } diff --git a/drivers/pci/host/pci-keystone.c b/drivers/pci/host/pci-keystone.c index b71f55b..299f2f0 100644 --- a/drivers/pci/host/pci-keystone.c +++ b/drivers/pci/host/pci-keystone.c @@ -15,6 +15,7 @@ #include <linux/irqchip/chained_irq.h> #include <linux/clk.h> #include <linux/delay.h> +#include <linux/interrupt.h> #include <linux/irqdomain.h> #include <linux/module.h> #include <linux/msi.h> @@ -226,6 +227,10 @@ static void ks_pcie_setup_interrupts(struct keystone_pcie *ks_pcie) ks_pcie); } } + + /* enable error interrupt */ + if (ks_pcie->error_irq > 0) + ks_dw_pcie_enable_error_irq(ks_pcie->va_app_base); } /* @@ -289,6 +294,16 @@ static struct pcie_host_ops keystone_pcie_host_ops = { .scan_bus = ks_dw_pcie_v3_65_scan_bus, }; +static irqreturn_t pcie_err_irq_handler(int irq, void *priv) +{ + struct keystone_pcie *ks_pcie = priv; + + if (ks_dw_pcie_handle_error_irq(ks_pcie->pp.dev, ks_pcie->va_app_base)) + return IRQ_HANDLED; + + return IRQ_NONE; +} + static int __init ks_add_pcie_port(struct keystone_pcie *ks_pcie, struct platform_device *pdev) { @@ -309,6 +324,22 @@ static int __init ks_add_pcie_port(struct keystone_pcie *ks_pcie, return ret; } + /* + * index 0 is the platform interrupt for error interrupt + * from RC. As this is optional to define this, we will + * just print a warning + */ + ks_pcie->error_irq = irq_of_parse_and_map(ks_pcie->np, 0); + if (ks_pcie->error_irq <= 0) + dev_warn(&pdev->dev, "No error irq defined\n"); + else { + if (request_irq(ks_pcie->error_irq, pcie_err_irq_handler, + IRQF_SHARED, "pcie-error-irq", ks_pcie) < 0) { + dev_err(&pdev->dev, "failed to request error irq\n"); + return ret; + } + } + pp->root_bus_nr = -1; pp->ops = &keystone_pcie_host_ops; ret = ks_dw_pcie_host_init(ks_pcie, ks_pcie->msi_intc_np); @@ -376,6 +407,7 @@ static int __init ks_pcie_probe(struct platform_device *pdev) devm_release_mem_region(dev, res->start, resource_size(res)); pp->dev = dev; + ks_pcie->np = node; platform_set_drvdata(pdev, ks_pcie); ks_pcie->clk = devm_clk_get(dev, "pcie"); if (IS_ERR(ks_pcie->clk)) { diff --git a/drivers/pci/host/pci-keystone.h b/drivers/pci/host/pci-keystone.h index f0944e8..2daa215 100644 --- a/drivers/pci/host/pci-keystone.h +++ b/drivers/pci/host/pci-keystone.h @@ -29,6 +29,10 @@ struct keystone_pcie { int msi_host_irqs[MAX_MSI_HOST_IRQS]; struct device_node *msi_intc_np; struct irq_domain *legacy_irq_domain; + struct device_node *np; + + /* error interrupt */ + int error_irq; /* Application register space */ void __iomem *va_app_base; @@ -42,6 +46,8 @@ phys_addr_t ks_dw_pcie_get_msi_addr(struct pcie_port *pp); /* Keystone specific PCI controller APIs */ void ks_dw_pcie_enable_legacy_irqs(struct keystone_pcie *ks_pcie); void ks_dw_pcie_handle_legacy_irq(struct keystone_pcie *ks_pcie, int offset); +void ks_dw_pcie_enable_error_irq(void __iomem *reg_base); +bool ks_dw_pcie_handle_error_irq(struct device *dev, void __iomem *reg_base); int ks_dw_pcie_host_init(struct keystone_pcie *ks_pcie, struct device_node *msi_intc_np); int ks_dw_pcie_wr_other_conf(struct pcie_port *pp, struct pci_bus *bus, -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html