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PCI: rcar: Add error interrupt handling 

Add option to enable interrupts to report any errors from the AHB-PCI
bridge to help find any issues with the bridge when in use.

Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk>
Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Simon Horman <horms+renesas@verge.net.au>
This commit is contained in:
Ben Dooks 2014-02-18 11:11:01 +09:00 committed by Bjorn Helgaas
parent ed65b78881
commit 80a595d941
1 changed files with 60 additions and 0 deletions
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60
drivers/pci/host/pci-rcar-gen2.c
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@ -39,9 +39,26 @@
#define RCAR_PCI_INT_ENABLE_REG (RCAR_AHBPCI_PCICOM_OFFSET + 0x20)
#define RCAR_PCI_INT_STATUS_REG (RCAR_AHBPCI_PCICOM_OFFSET + 0x24)
#define RCAR_PCI_INT_SIGTABORT (1 << 0)
#define RCAR_PCI_INT_SIGRETABORT (1 << 1)
#define RCAR_PCI_INT_REMABORT (1 << 2)
#define RCAR_PCI_INT_PERR (1 << 3)
#define RCAR_PCI_INT_SIGSERR (1 << 4)
#define RCAR_PCI_INT_RESERR (1 << 5)
#define RCAR_PCI_INT_WIN1ERR (1 << 12)
#define RCAR_PCI_INT_WIN2ERR (1 << 13)
#define RCAR_PCI_INT_A (1 << 16)
#define RCAR_PCI_INT_B (1 << 17)
#define RCAR_PCI_INT_PME (1 << 19)
#define RCAR_PCI_INT_ALLERRORS (RCAR_PCI_INT_SIGTABORT | \
RCAR_PCI_INT_SIGRETABORT | \
RCAR_PCI_INT_SIGRETABORT | \
RCAR_PCI_INT_REMABORT | \
RCAR_PCI_INT_PERR | \
RCAR_PCI_INT_SIGSERR | \
RCAR_PCI_INT_RESERR | \
RCAR_PCI_INT_WIN1ERR | \
RCAR_PCI_INT_WIN2ERR)
#define RCAR_AHB_BUS_CTR_REG (RCAR_AHBPCI_PCICOM_OFFSET + 0x30)
#define RCAR_AHB_BUS_MMODE_HTRANS (1 << 0)
@ -164,6 +181,46 @@ static int __init rcar_pci_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
return priv->irq;
}
#ifdef CONFIG_PCI_DEBUG
/* if debug enabled, then attach an error handler irq to the bridge */
static irqreturn_t rcar_pci_err_irq(int irq, void *pw)
{
struct rcar_pci_priv *priv = pw;
u32 status = ioread32(priv->reg + RCAR_PCI_INT_STATUS_REG);
if (status & RCAR_PCI_INT_ALLERRORS) {
dev_err(priv->dev, "error irq: status %08x\n", status);
/* clear the error(s) */
iowrite32(status & RCAR_PCI_INT_ALLERRORS,
priv->reg + RCAR_PCI_INT_STATUS_REG);
return IRQ_HANDLED;
}
return IRQ_NONE;
}
static void rcar_pci_setup_errirq(struct rcar_pci_priv *priv)
{
int ret;
u32 val;
ret = devm_request_irq(priv->dev, priv->irq, rcar_pci_err_irq,
IRQF_SHARED, "error irq", priv);
if (ret) {
dev_err(priv->dev, "cannot claim IRQ for error handling\n");
return;
}
val = ioread32(priv->reg + RCAR_PCI_INT_ENABLE_REG);
val |= RCAR_PCI_INT_ALLERRORS;
iowrite32(val, priv->reg + RCAR_PCI_INT_ENABLE_REG);
}
#else
static inline void rcar_pci_setup_errirq(struct rcar_pci_priv *priv) { }
#endif
/* PCI host controller setup */
static int __init rcar_pci_setup(int nr, struct pci_sys_data *sys)
{
@ -224,6 +281,9 @@ static int __init rcar_pci_setup(int nr, struct pci_sys_data *sys)
iowrite32(RCAR_PCI_INT_A | RCAR_PCI_INT_B | RCAR_PCI_INT_PME,
reg + RCAR_PCI_INT_ENABLE_REG);
if (priv->irq > 0)
rcar_pci_setup_errirq(priv);
/* Add PCI resources */
pci_add_resource(&sys->resources, &priv->io_res);
pci_add_resource(&sys->resources, &priv->mem_res);