1 files changed, 114 insertions, 0 deletions

diff --git a/arch/mips/sgi-ip22/ip22-berr.c b/arch/mips/sgi-ip22/ip22-berr.c
new file mode 100644
index 000000000000..a28dc7800072
--- /dev/null
+++ b/arch/mips/sgi-ip22/ip22-berr.c
@@ -0,0 +1,114 @@
+/*
+ * ip22-berr.c: Bus error handling.
+ *
+ * Copyright (C) 2002, 2003 Ladislav Michl (ladis@linux-mips.org)
+ */
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+
+#include <asm/addrspace.h>
+#include <asm/system.h>
+#include <asm/traps.h>
+#include <asm/branch.h>
+#include <asm/sgi/mc.h>
+#include <asm/sgi/hpc3.h>
+#include <asm/sgi/ioc.h>
+#include <asm/sgi/ip22.h>
+
+
+static unsigned int cpu_err_stat;       /* Status reg for CPU */
+static unsigned int gio_err_stat;       /* Status reg for GIO */
+static unsigned int cpu_err_addr;       /* Error address reg for CPU */
+static unsigned int gio_err_addr;       /* Error address reg for GIO */
+static unsigned int extio_stat;
+static unsigned int hpc3_berr_stat;     /* Bus error interrupt status */
+
+static void save_and_clear_buserr(void)
+{
+        /* save status registers */
+        cpu_err_addr = sgimc->cerr;
+        cpu_err_stat = sgimc->cstat;
+        gio_err_addr = sgimc->gerr;
+        gio_err_stat = sgimc->gstat;
+        extio_stat = ip22_is_fullhouse() ? sgioc->extio : (sgint->errstat << 4);
+        hpc3_berr_stat = hpc3c0->bestat;
+
+        sgimc->cstat = sgimc->gstat = 0;
+}
+
+#define GIO_ERRMASK     0xff00
+#define CPU_ERRMASK     0x3f00
+
+static void print_buserr(void)
+{
+        if (extio_stat & EXTIO_MC_BUSERR)
+                printk(KERN_ERR "MC Bus Error\n");
+        if (extio_stat & EXTIO_HPC3_BUSERR)
+                printk(KERN_ERR "HPC3 Bus Error 0x%x:<id=0x%x,%s,lane=0x%x>\n",
+                        hpc3_berr_stat,
+                        (hpc3_berr_stat & HPC3_BESTAT_PIDMASK) >>
+                                          HPC3_BESTAT_PIDSHIFT,
+                        (hpc3_berr_stat & HPC3_BESTAT_CTYPE) ? "PIO" : "DMA",
+                        hpc3_berr_stat & HPC3_BESTAT_BLMASK);
+        if (extio_stat & EXTIO_EISA_BUSERR)
+                printk(KERN_ERR "EISA Bus Error\n");
+        if (cpu_err_stat & CPU_ERRMASK)
+                printk(KERN_ERR "CPU error 0x%x<%s%s%s%s%s%s> @ 0x%08x\n",
+                        cpu_err_stat,
+                        cpu_err_stat & SGIMC_CSTAT_RD ? "RD " : "",
+                        cpu_err_stat & SGIMC_CSTAT_PAR ? "PAR " : "",
+                        cpu_err_stat & SGIMC_CSTAT_ADDR ? "ADDR " : "",
+                        cpu_err_stat & SGIMC_CSTAT_SYSAD_PAR ? "SYSAD " : "",
+                        cpu_err_stat & SGIMC_CSTAT_SYSCMD_PAR ? "SYSCMD " : "",
+                        cpu_err_stat & SGIMC_CSTAT_BAD_DATA ? "BAD_DATA " : "",
+                        cpu_err_addr);
+        if (gio_err_stat & GIO_ERRMASK)
+                printk(KERN_ERR "GIO error 0x%x:<%s%s%s%s%s%s%s%s> @ 0x%08x\n",
+                        gio_err_stat,
+                        gio_err_stat & SGIMC_GSTAT_RD ? "RD " : "",
+                        gio_err_stat & SGIMC_GSTAT_WR ? "WR " : "",
+                        gio_err_stat & SGIMC_GSTAT_TIME ? "TIME " : "",
+                        gio_err_stat & SGIMC_GSTAT_PROM ? "PROM " : "",
+                        gio_err_stat & SGIMC_GSTAT_ADDR ? "ADDR " : "",
+                        gio_err_stat & SGIMC_GSTAT_BC ? "BC " : "",
+                        gio_err_stat & SGIMC_GSTAT_PIO_RD ? "PIO_RD " : "",
+                        gio_err_stat & SGIMC_GSTAT_PIO_WR ? "PIO_WR " : "",
+                        gio_err_addr);
+}
+
+/*
+ * MC sends an interrupt whenever bus or parity errors occur. In addition,
+ * if the error happened during a CPU read, it also asserts the bus error
+ * pin on the R4K. Code in bus error handler save the MC bus error registers
+ * and then clear the interrupt when this happens.
+ */
+
+void ip22_be_interrupt(int irq, struct pt_regs *regs)
+{
+        const int field = 2 * sizeof(unsigned long);
+
+        save_and_clear_buserr();
+        print_buserr();
+        printk(KERN_ALERT "%s bus error, epc == %0*lx, ra == %0*lx\n",
+               (regs->cp0_cause & 4) ? "Data" : "Instruction",
+               field, regs->cp0_epc, field, regs->regs[31]);
+        /* Assume it would be too dangerous to continue ... */
+        die_if_kernel("Oops", regs);
+        force_sig(SIGBUS, current);
+}
+
+static int ip22_be_handler(struct pt_regs *regs, int is_fixup)
+{
+        save_and_clear_buserr();
+        if (is_fixup)
+                return MIPS_BE_FIXUP;
+        print_buserr();
+        return MIPS_BE_FATAL;
+}
+
+void __init ip22_be_init(void)
+{
+        board_be_handler = ip22_be_handler;
+}