[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>

4 files changed, 116 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");
+}
diff --git a/arch/mips/pci/ops-tx4927.c b/arch/mips/pci/ops-tx4927.c
index 038e311b069d..5989e747527f 100644
--- a/arch/mips/pci/ops-tx4927.c
+++ b/arch/mips/pci/ops-tx4927.c
@@ -16,6 +16,8 @@
  * option) any later version.
  */
 #include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <asm/txx9/pci.h>
 #include <asm/txx9/tx4927pcic.h>
 
 static struct {
@@ -431,6 +433,66 @@ void tx4927_report_pcic_status(void)
         }
 }
 
+static void tx4927_dump_pcic_settings1(struct tx4927_pcic_reg __iomem *pcicptr)
+{
+        int i;
+        __u32 __iomem *preg = (__u32 __iomem *)pcicptr;
+
+        printk(KERN_INFO "tx4927 pcic (0x%p) settings:", pcicptr);
+        for (i = 0; i < sizeof(struct tx4927_pcic_reg); i += 4, preg++) {
+                if (i % 32 == 0) {
+                        printk(KERN_CONT "\n");
+                        printk(KERN_INFO "%04x:", i);
+                }
+                /* skip registers with side-effects */
+                if (i == offsetof(struct tx4927_pcic_reg, g2pintack)
+                    || i == offsetof(struct tx4927_pcic_reg, g2pspc)
+                    || i == offsetof(struct tx4927_pcic_reg, g2pcfgadrs)
+                    || i == offsetof(struct tx4927_pcic_reg, g2pcfgdata)) {
+                        printk(KERN_CONT " XXXXXXXX");
+                        continue;
+                }
+                printk(KERN_CONT " %08x", __raw_readl(preg));
+        }
+        printk(KERN_CONT "\n");
+}
+
+void tx4927_dump_pcic_settings(void)
+{
+        int i;
+
+        for (i = 0; i < ARRAY_SIZE(pcicptrs); i++) {
+                if (pcicptrs[i].pcicptr)
+                        tx4927_dump_pcic_settings1(pcicptrs[i].pcicptr);
+        }
+}
+
+irqreturn_t tx4927_pcierr_interrupt(int irq, void *dev_id)
+{
+        struct pt_regs *regs = get_irq_regs();
+        struct tx4927_pcic_reg __iomem *pcicptr =
+                (struct tx4927_pcic_reg __iomem *)(unsigned long)dev_id;
+
+        if (txx9_pci_err_action != TXX9_PCI_ERR_IGNORE) {
+                printk(KERN_WARNING "PCIERR interrupt at 0x%0*lx\n",
+                       (int)(2 * sizeof(unsigned long)), regs->cp0_epc);
+                tx4927_report_pcic_status1(pcicptr);
+        }
+        if (txx9_pci_err_action != TXX9_PCI_ERR_PANIC) {
+                /* clear all pci errors */
+                __raw_writel((__raw_readl(&pcicptr->pcistatus) & 0x0000ffff)
+                             | (TX4927_PCIC_PCISTATUS_ALL << 16),
+                             &pcicptr->pcistatus);
+                __raw_writel(TX4927_PCIC_G2PSTATUS_ALL, &pcicptr->g2pstatus);
+                __raw_writel(TX4927_PCIC_PBASTATUS_ALL, &pcicptr->pbastatus);
+                __raw_writel(TX4927_PCIC_PCICSTATUS_ALL, &pcicptr->pcicstatus);
+                return IRQ_HANDLED;
+        }
+        console_verbose();
+        tx4927_dump_pcic_settings1(pcicptr);
+        panic("PCI error.");
+}
+
 #ifdef CONFIG_TOSHIBA_FPCIB0
 static void __init tx4927_quirk_slc90e66_bridge(struct pci_dev *dev)
 {
diff --git a/arch/mips/pci/pci-tx4927.c b/arch/mips/pci/pci-tx4927.c
index 27e86a09dd41..aaa900596792 100644
--- a/arch/mips/pci/pci-tx4927.c
+++ b/arch/mips/pci/pci-tx4927.c
@@ -15,6 +15,7 @@
 #include <linux/init.h>
 #include <linux/pci.h>
 #include <linux/kernel.h>
+#include <linux/interrupt.h>
 #include <asm/txx9/generic.h>
 #include <asm/txx9/tx4927.h>
 
@@ -81,3 +82,12 @@ int __init tx4927_pciclk66_setup(void)
                 pciclk = -1;
         return pciclk;
 }
+
+void __init tx4927_setup_pcierr_irq(void)
+{
+        if (request_irq(TXX9_IRQ_BASE + TX4927_IR_PCIERR,
+                        tx4927_pcierr_interrupt,
+                        IRQF_DISABLED, "PCI error",
+                        (void *)TX4927_PCIC_REG))
+                printk(KERN_WARNING "Failed to request irq for PCIERR\n");
+}
diff --git a/arch/mips/pci/pci-tx4938.c b/arch/mips/pci/pci-tx4938.c
index e5375511c2b7..60e2c52c2c5e 100644
--- a/arch/mips/pci/pci-tx4938.c
+++ b/arch/mips/pci/pci-tx4938.c
@@ -15,6 +15,7 @@
 #include <linux/init.h>
 #include <linux/pci.h>
 #include <linux/kernel.h>
+#include <linux/interrupt.h>
 #include <asm/txx9/generic.h>
 #include <asm/txx9/tx4938.h>
 
@@ -132,3 +133,12 @@ int tx4938_pcic1_map_irq(const struct pci_dev *dev, u8 slot)
         }
         return -1;
 }
+
+void __init tx4938_setup_pcierr_irq(void)
+{
+        if (request_irq(TXX9_IRQ_BASE + TX4938_IR_PCIERR,
+                        tx4927_pcierr_interrupt,
+                        IRQF_DISABLED, "PCI error",
+                        (void *)TX4927_PCIC_REG))
+                printk(KERN_WARNING "Failed to request irq for PCIERR\n");
+}