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Message-ID: <56FDA0A4.5040207@ti.com>
Date: Thu, 31 Mar 2016 18:11:48 -0400
From: Murali Karicheri <m-karicheri2@...com>
To: <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<linux-pci@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>, <bhelgaas@...gle.com>
Subject: Re: [PATCH next 1/2] PCI: keystone: add pci error irq handler
On 03/22/2016 03:52 PM, Murali Karicheri wrote:
> 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@...com>
> Cc: Rob Herring <robh+dt@...nel.org>
> Cc: Pawel Moll <pawel.moll@....com>
> Cc: Mark Rutland <mark.rutland@....com>
> Cc: Ian Campbell <ijc+devicetree@...lion.org.uk>
> Cc: Kumar Gala <galak@...eaurora.org>
> Cc: Bjorn Helgaas <bhelgaas@...gle.com>
> ---
> .../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,
>
Bjorn,
Will you be applying this to your PCI next branch?
--
Murali Karicheri
Linux Kernel, Keystone
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