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   1 /*
   2  * File:         arch/blackfin/mach-common/irqpanic.c
   3  * Based on:
   4  * Author:
   5  *
   6  * Created:      ?
   7  * Description:  panic kernel with dump information
   8  *
   9  * Modified:     rgetz - added cache checking code 14Feb06
  10  *               Copyright 2004-2006 Analog Devices Inc.
  11  *
  12  * Bugs:         Enter bugs at http://blackfin.uclinux.org/
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2 of the License, or
  17  * (at your option) any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with this program; if not, see the file COPYING, or write
  26  * to the Free Software Foundation, Inc.,
  27  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  28  */
  29
  30 #include <linux/module.h>
  31 #include <linux/kernel_stat.h>
  32 #include <linux/sched.h>
  33 #include <asm/traps.h>
  34 #include <asm/blackfin.h>
  35
  36 #include "../oprofile/op_blackfin.h"
  37
  38 #ifdef CONFIG_DEBUG_ICACHE_CHECK
  39 #define L1_ICACHE_START 0xffa10000
  40 #define L1_ICACHE_END   0xffa13fff
  41 void irq_panic(int reason, struct pt_regs *regs) __attribute__ ((l1_text));
  42 #endif
  43
  44 /*
  45  * irq_panic - calls panic with string setup
  46  */
  47 asmlinkage void irq_panic(int reason, struct pt_regs *regs)
  48 {
  49         int sig = 0;
  50         siginfo_t info;
  51
  52 #ifdef CONFIG_DEBUG_ICACHE_CHECK
  53         unsigned int cmd, tag, ca, cache_hi, cache_lo, *pa;
  54         unsigned short i, j, die;
  55         unsigned int bad[10][6];
  56
  57         /* check entire cache for coherency
  58          * Since printk is in cacheable memory,
  59          * don't call it until you have checked everything
  60         */
  61
  62         die = 0;
  63         i = 0;
  64
  65         /* check icache */
  66
  67         for (ca = L1_ICACHE_START; ca <= L1_ICACHE_END && i < 10; ca += 32) {
  68
  69                 /* Grab various address bits for the itest_cmd fields                      */
  70                 cmd = (((ca & 0x3000) << 4) |   /* ca[13:12] for SBNK[1:0]             */
  71                        ((ca & 0x0c00) << 16) |  /* ca[11:10] for WAYSEL[1:0]           */
  72                        ((ca & 0x3f8)) | /* ca[09:03] for SET[4:0] and DW[1:0]  */
  73                        0);      /* Access Tag, Read access             */
  74
  75                 SSYNC();
  76                 bfin_write_ITEST_COMMAND(cmd);
  77                 SSYNC();
  78                 tag = bfin_read_ITEST_DATA0();
  79                 SSYNC();
  80
  81                 /* if tag is marked as valid, check it */
  82                 if (tag & 1) {
  83                         /* The icache is arranged in 4 groups of 64-bits */
  84                         for (j = 0; j < 32; j += 8) {
  85                                 cmd = ((((ca + j) & 0x3000) << 4) |     /* ca[13:12] for SBNK[1:0]             */
  86                                        (((ca + j) & 0x0c00) << 16) |    /* ca[11:10] for WAYSEL[1:0]           */
  87                                        (((ca + j) & 0x3f8)) |   /* ca[09:03] for SET[4:0] and DW[1:0]  */
  88                                        4);      /* Access Data, Read access             */
  89
  90                                 SSYNC();
  91                                 bfin_write_ITEST_COMMAND(cmd);
  92                                 SSYNC();
  93
  94                                 cache_hi = bfin_read_ITEST_DATA1();
  95                                 cache_lo = bfin_read_ITEST_DATA0();
  96
  97                                 pa = ((unsigned int *)((tag & 0xffffcc00) |
  98                                                        ((ca + j) & ~(0xffffcc00))));
  99
 100                                 /*
 101                                  * Debugging this, enable
 102                                  *
 103                                  * printk("addr: %08x %08x%08x | %08x%08x\n",
 104                                  *  ((unsigned int *)((tag & 0xffffcc00)  | ((ca+j) & ~(0xffffcc00)))),
 105                                  *   cache_hi, cache_lo, *(pa+1), *pa);
 106                                  */
 107
 108                                 if (cache_hi != *(pa + 1) || cache_lo != *pa) {
 109                                         /* Since icache is not working, stay out of it, by not printing */
 110                                         die = 1;
 111                                         bad[i][0] = (ca + j);
 112                                         bad[i][1] = cache_hi;
 113                                         bad[i][2] = cache_lo;
 114                                         bad[i][3] = ((tag & 0xffffcc00) |
 115                                                 ((ca + j) & ~(0xffffcc00)));
 116                                         bad[i][4] = *(pa + 1);
 117                                         bad[i][5] = *(pa);
 118                                         i++;
 119                                 }
 120                         }
 121                 }
 122         }
 123         if (die) {
 124                 printk(KERN_EMERG "icache coherency error\n");
 125                 for (j = 0; j <= i; j++) {
 126                         printk(KERN_EMERG
 127                             "cache address   : %08x  cache value : %08x%08x\n",
 128                              bad[j][0], bad[j][1], bad[j][2]);
 129                         printk(KERN_EMERG
 130                             "physical address: %08x  SDRAM value : %08x%08x\n",
 131                              bad[j][3], bad[j][4], bad[j][5]);
 132                 }
 133                 panic("icache coherency error");
 134         } else {
 135                 printk(KERN_EMERG "icache checked, and OK\n");
 136         }
 137 #endif
 138
 139         printk(KERN_EMERG "\n");
 140         printk(KERN_EMERG "Exception: IRQ 0x%x entered\n", reason);
 141         printk(KERN_EMERG " code=[0x%08lx],   stack frame=0x%08lx,  "
 142             " bad PC=0x%08lx\n",
 143             (unsigned long)regs->seqstat,
 144             (unsigned long)regs,
 145             (unsigned long)regs->pc);
 146         if (reason == 0x5) {
 147                 printk(KERN_EMERG "----------- HARDWARE ERROR -----------\n");
 148
 149                 /* There is only need to check for Hardware Errors, since other
 150                  * EXCEPTIONS are handled in TRAPS.c (MH)
 151                  */
 152                 switch (regs->seqstat & SEQSTAT_HWERRCAUSE) {
 153                 case (SEQSTAT_HWERRCAUSE_SYSTEM_MMR):   /* System MMR Error */
 154                         info.si_code = BUS_ADRALN;
 155                         sig = SIGBUS;
 156                         printk(KERN_EMERG HWC_x2);
 157                         break;
 158                 case (SEQSTAT_HWERRCAUSE_EXTERN_ADDR):  /* External Memory Addressing Error */
 159                         info.si_code = BUS_ADRERR;
 160                         sig = SIGBUS;
 161                         printk(KERN_EMERG HWC_x3);
 162                         break;
 163                 case (SEQSTAT_HWERRCAUSE_PERF_FLOW):    /* Performance Monitor Overflow */
 164                         printk(KERN_EMERG HWC_x12);
 165                         break;
 166                 case (SEQSTAT_HWERRCAUSE_RAISE_5):      /* RAISE 5 instruction */
 167                         printk(KERN_EMERG HWC_x18);
 168                         break;
 169                 default:        /* Reserved */
 170                         printk(KERN_EMERG HWC_default);
 171                         break;
 172                 }
 173         }
 174
 175         regs->ipend = bfin_read_IPEND();
 176         dump_bfin_regs(regs, (void *)regs->pc);
 177         if (0 == (info.si_signo = sig) || 0 == user_mode(regs)) /* in kernelspace */
 178                 panic("Unhandled IRQ or exceptions!\n");
 179         else {                  /* in userspace */
 180                 info.si_errno = 0;
 181                 info.si_addr = (void *)regs->pc;
 182                 force_sig_info(sig, &info, current);
 183         }
 184 }
 185
 186 #ifdef CONFIG_HARDWARE_PM
 187 /*
 188  * call the handler of Performance overflow
 189  */
 190 asmlinkage void pm_overflow(int irq, struct pt_regs *regs)
 191 {
 192         pm_overflow_handler(irq, regs);
 193 }
 194 #endif