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PCI: keystone: Add error IRQ handler

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Keystone PCI hardware generates error interrupts at RC using a platform IRQ
instead of a standard MSI or legacy IRQ.  Add a simple error handler that
logs the fatal interrupt status to the console.

[bhelgaas: s/node/dev->of_node/, tidy comments, return irqreturn_t directly]
Signed-off-by: Murali Karicheri <m-karicheri2@ti.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Rob Herring <robh@kernel.org>
CC: Pawel Moll <pawel.moll@arm.com>
CC: Mark Rutland <mark.rutland@arm.com>
CC: Ian Campbell <ijc+devicetree@hellion.org.uk>
CC: Kumar Gala <galak@codeaurora.org>
This commit is contained in:
Murali Karicheri
2016-04-11 10:50:30 -04:00
committed by Bjorn Helgaas
parent 9735a22799
commit 025dd3daed
4 changed files with 74 additions and 0 deletions
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38
drivers/pci/host/pci-keystone-dw.c
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@@ -14,6 +14,7 @@
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/irqreturn.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_pci.h>
@@ -53,6 +54,21 @@
#define IRQ_STATUS 0x184
#define MSI_IRQ_OFFSET 4
/* Error IRQ bits */
#define ERR_AER BIT(5) /* ECRC error */
#define ERR_AXI BIT(4) /* AXI tag lookup fatal error */
#define ERR_CORR BIT(3) /* Correctable error */
#define ERR_NONFATAL BIT(2) /* Non-fatal error */
#define ERR_FATAL BIT(1) /* Fatal error */
#define ERR_SYS BIT(0) /* System (fatal, non-fatal, or correctable) */
#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
@@ -243,6 +259,28 @@ 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);
}
irqreturn_t ks_dw_pcie_handle_error_irq(struct device *dev,
void __iomem *reg_base)
{
u32 status;
status = readl(reg_base + ERR_IRQ_STATUS_RAW) & ERR_IRQ_ALL;
if (!status)
return IRQ_NONE;
if (status & ERR_FATAL_IRQ)
dev_err(dev, "fatal error (status %#010x)\n", status);
/* Ack the IRQ; status bits are RW1C */
writel(status, reg_base + ERR_IRQ_STATUS);
return IRQ_HANDLED;
}
static void ks_dw_pcie_ack_legacy_irq(struct irq_data *d)
{
}