[MIPS] TXx9: PCI error handling

From: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Date: Thu, 24 Jul 2008 00:25:16 +0900
Subject: [PATCH] txx9: PCI error handling

Add more control and detailed report on PCI error interrupt.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 34 insertions, 0 deletions

diff --git a/arch/mips/pci/ops-tx3927.c b/arch/mips/pci/ops-tx3927.c
index c6bd79e71e26..31c150196595 100644
--- a/arch/mips/pci/ops-tx3927.c
+++ b/arch/mips/pci/ops-tx3927.c
@@ -37,8 +37,11 @@
 #include <linux/pci.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
+#include <linux/interrupt.h>
 
 #include <asm/addrspace.h>
+#include <asm/txx9irq.h>
+#include <asm/txx9/pci.h>
 #include <asm/txx9/tx3927.h>
 
 static int mkaddr(struct pci_bus *bus, unsigned char devfn, unsigned char where)
@@ -194,3 +197,34 @@ void __init tx3927_pcic_setup(struct pci_controller *channel,
                 PCI_COMMAND_PARITY | PCI_COMMAND_SERR;
         local_irq_restore(flags);
 }
+
+static irqreturn_t tx3927_pcierr_interrupt(int irq, void *dev_id)
+{
+        struct pt_regs *regs = get_irq_regs();
+
+        if (txx9_pci_err_action != TXX9_PCI_ERR_IGNORE) {
+                printk(KERN_WARNING "PCI error interrupt at 0x%08lx.\n",
+                       regs->cp0_epc);
+                printk(KERN_WARNING "pcistat:%02x, lbstat:%04lx\n",
+                       tx3927_pcicptr->pcistat, tx3927_pcicptr->lbstat);
+        }
+        if (txx9_pci_err_action != TXX9_PCI_ERR_PANIC) {
+                /* clear all pci errors */
+                tx3927_pcicptr->pcistat |= TX3927_PCIC_PCISTATIM_ALL;
+                tx3927_pcicptr->istat = TX3927_PCIC_IIM_ALL;
+                tx3927_pcicptr->tstat = TX3927_PCIC_TIM_ALL;
+                tx3927_pcicptr->lbstat = TX3927_PCIC_LBIM_ALL;
+                return IRQ_HANDLED;
+        }
+        console_verbose();
+        panic("PCI error.");
+}
+
+void __init tx3927_setup_pcierr_irq(void)
+{
+        if (request_irq(TXX9_IRQ_BASE + TX3927_IR_PCI,
+                        tx3927_pcierr_interrupt,
+                        IRQF_DISABLED, "PCI error",
+                        (void *)TX3927_PCIC_REG))
+                printk(KERN_WARNING "Failed to request irq for PCIERR\n");
+}