arch/mips/sgi-ip22/ip22-berr.c

   1 /*
   2  * ip22-berr.c: Bus error handling.
   3  *
   4  * Copyright (C) 2002, 2003 Ladislav Michl (ladis@linux-mips.org)
   5  */
   6
   7 #include <linux/init.h>
   8 #include <linux/kernel.h>
   9 #include <linux/sched.h>
  10
  11 #include <asm/addrspace.h>
  12 #include <asm/traps.h>
  13 #include <asm/branch.h>
  14 #include <asm/irq_regs.h>
  15 #include <asm/sgi/mc.h>
  16 #include <asm/sgi/hpc3.h>
  17 #include <asm/sgi/ioc.h>
  18 #include <asm/sgi/ip22.h>
  19
  20
  21 static unsigned int cpu_err_stat;       /* Status reg for CPU */
  22 static unsigned int gio_err_stat;       /* Status reg for GIO */
  23 static unsigned int cpu_err_addr;       /* Error address reg for CPU */
  24 static unsigned int gio_err_addr;       /* Error address reg for GIO */
  25 static unsigned int extio_stat;
  26 static unsigned int hpc3_berr_stat;     /* Bus error interrupt status */
  27
  28 static void save_and_clear_buserr(void)
  29 {
  30         /* save status registers */
  31         cpu_err_addr = sgimc->cerr;
  32         cpu_err_stat = sgimc->cstat;
  33         gio_err_addr = sgimc->gerr;
  34         gio_err_stat = sgimc->gstat;
  35         extio_stat = ip22_is_fullhouse() ? sgioc->extio : (sgint->errstat << 4);
  36         hpc3_berr_stat = hpc3c0->bestat;
  37
  38         sgimc->cstat = sgimc->gstat = 0;
  39 }
  40
  41 #define GIO_ERRMASK     0xff00
  42 #define CPU_ERRMASK     0x3f00
  43
  44 static void print_buserr(void)
  45 {
  46         if (extio_stat & EXTIO_MC_BUSERR)
  47                 printk(KERN_ERR "MC Bus Error\n");
  48         if (extio_stat & EXTIO_HPC3_BUSERR)
  49                 printk(KERN_ERR "HPC3 Bus Error 0x%x:<id=0x%x,%s,lane=0x%x>\n",
  50                         hpc3_berr_stat,
  51                         (hpc3_berr_stat & HPC3_BESTAT_PIDMASK) >>
  52                                           HPC3_BESTAT_PIDSHIFT,
  53                         (hpc3_berr_stat & HPC3_BESTAT_CTYPE) ? "PIO" : "DMA",
  54                         hpc3_berr_stat & HPC3_BESTAT_BLMASK);
  55         if (extio_stat & EXTIO_EISA_BUSERR)
  56                 printk(KERN_ERR "EISA Bus Error\n");
  57         if (cpu_err_stat & CPU_ERRMASK)
  58                 printk(KERN_ERR "CPU error 0x%x<%s%s%s%s%s%s> @ 0x%08x\n",
  59                         cpu_err_stat,
  60                         cpu_err_stat & SGIMC_CSTAT_RD ? "RD " : "",
  61                         cpu_err_stat & SGIMC_CSTAT_PAR ? "PAR " : "",
  62                         cpu_err_stat & SGIMC_CSTAT_ADDR ? "ADDR " : "",
  63                         cpu_err_stat & SGIMC_CSTAT_SYSAD_PAR ? "SYSAD " : "",
  64                         cpu_err_stat & SGIMC_CSTAT_SYSCMD_PAR ? "SYSCMD " : "",
  65                         cpu_err_stat & SGIMC_CSTAT_BAD_DATA ? "BAD_DATA " : "",
  66                         cpu_err_addr);
  67         if (gio_err_stat & GIO_ERRMASK)
  68                 printk(KERN_ERR "GIO error 0x%x:<%s%s%s%s%s%s%s%s> @ 0x%08x\n",
  69                         gio_err_stat,
  70                         gio_err_stat & SGIMC_GSTAT_RD ? "RD " : "",
  71                         gio_err_stat & SGIMC_GSTAT_WR ? "WR " : "",
  72                         gio_err_stat & SGIMC_GSTAT_TIME ? "TIME " : "",
  73                         gio_err_stat & SGIMC_GSTAT_PROM ? "PROM " : "",
  74                         gio_err_stat & SGIMC_GSTAT_ADDR ? "ADDR " : "",
  75                         gio_err_stat & SGIMC_GSTAT_BC ? "BC " : "",
  76                         gio_err_stat & SGIMC_GSTAT_PIO_RD ? "PIO_RD " : "",
  77                         gio_err_stat & SGIMC_GSTAT_PIO_WR ? "PIO_WR " : "",
  78                         gio_err_addr);
  79 }
  80
  81 /*
  82  * MC sends an interrupt whenever bus or parity errors occur. In addition,
  83  * if the error happened during a CPU read, it also asserts the bus error
  84  * pin on the R4K. Code in bus error handler save the MC bus error registers
  85  * and then clear the interrupt when this happens.
  86  */
  87
  88 void ip22_be_interrupt(int irq)
  89 {
  90         const int field = 2 * sizeof(unsigned long);
  91         struct pt_regs *regs = get_irq_regs();
  92
  93         save_and_clear_buserr();
  94         print_buserr();
  95         printk(KERN_ALERT "%s bus error, epc == %0*lx, ra == %0*lx\n",
  96                (regs->cp0_cause & 4) ? "Data" : "Instruction",
  97                field, regs->cp0_epc, field, regs->regs[31]);
  98         /* Assume it would be too dangerous to continue ... */
  99         die_if_kernel("Oops", regs);
 100         force_sig(SIGBUS, current);
 101 }
 102
 103 static int ip22_be_handler(struct pt_regs *regs, int is_fixup)
 104 {
 105         save_and_clear_buserr();
 106         if (is_fixup)
 107                 return MIPS_BE_FIXUP;
 108         print_buserr();
 109         return MIPS_BE_FATAL;
 110 }
 111
 112 void __init ip22_be_init(void)
 113 {
 114         board_be_handler = ip22_be_handler;
 115 }