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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/blackfin.h>
  34
  35 #define L1_ICACHE_START 0xffa10000
  36 #define L1_ICACHE_END   0xffa13fff
  37
  38 /*
  39  * irq_panic - calls panic with string setup
  40  */
  41 __attribute__ ((l1_text))
  42 asmlinkage void irq_panic(int reason, struct pt_regs *regs)
  43 {
  44         unsigned int cmd, tag, ca, cache_hi, cache_lo, *pa;
  45         unsigned short i, j, die;
  46         unsigned int bad[10][6];
  47
  48         /* check entire cache for coherency
  49          * Since printk is in cacheable memory,
  50          * don't call it until you have checked everything
  51         */
  52
  53         die = 0;
  54         i = 0;
  55
  56         /* check icache */
  57
  58         for (ca = L1_ICACHE_START; ca <= L1_ICACHE_END && i < 10; ca += 32) {
  59
  60                 /* Grab various address bits for the itest_cmd fields                      */
  61                 cmd = (((ca & 0x3000) << 4) |   /* ca[13:12] for SBNK[1:0]             */
  62                        ((ca & 0x0c00) << 16) |  /* ca[11:10] for WAYSEL[1:0]           */
  63                        ((ca & 0x3f8)) | /* ca[09:03] for SET[4:0] and DW[1:0]  */
  64                        0);      /* Access Tag, Read access             */
  65
  66                 SSYNC();
  67                 bfin_write_ITEST_COMMAND(cmd);
  68                 SSYNC();
  69                 tag = bfin_read_ITEST_DATA0();
  70                 SSYNC();
  71
  72                 /* if tag is marked as valid, check it */
  73                 if (tag & 1) {
  74                         /* The icache is arranged in 4 groups of 64-bits */
  75                         for (j = 0; j < 32; j += 8) {
  76                                 cmd = ((((ca + j) & 0x3000) << 4) |     /* ca[13:12] for SBNK[1:0]             */
  77                                        (((ca + j) & 0x0c00) << 16) |    /* ca[11:10] for WAYSEL[1:0]           */
  78                                        (((ca + j) & 0x3f8)) |   /* ca[09:03] for SET[4:0] and DW[1:0]  */
  79                                        4);      /* Access Data, Read access             */
  80
  81                                 SSYNC();
  82                                 bfin_write_ITEST_COMMAND(cmd);
  83                                 SSYNC();
  84
  85                                 cache_hi = bfin_read_ITEST_DATA1();
  86                                 cache_lo = bfin_read_ITEST_DATA0();
  87
  88                                 pa = ((unsigned int *)((tag & 0xffffcc00) |
  89                                                        ((ca + j) & ~(0xffffcc00))));
  90
  91                                 /*
  92                                  * Debugging this, enable
  93                                  *
  94                                  * printk("addr: %08x %08x%08x | %08x%08x\n",
  95                                  *  ((unsigned int *)((tag & 0xffffcc00)  | ((ca+j) & ~(0xffffcc00)))),
  96                                  *   cache_hi, cache_lo, *(pa+1), *pa);
  97                                  */
  98
  99                                 if (cache_hi != *(pa + 1) || cache_lo != *pa) {
 100                                         /* Since icache is not working, stay out of it, by not printing */
 101                                         die = 1;
 102                                         bad[i][0] = (ca + j);
 103                                         bad[i][1] = cache_hi;
 104                                         bad[i][2] = cache_lo;
 105                                         bad[i][3] = ((tag & 0xffffcc00) |
 106                                                 ((ca + j) & ~(0xffffcc00)));
 107                                         bad[i][4] = *(pa + 1);
 108                                         bad[i][5] = *(pa);
 109                                         i++;
 110                                 }
 111                         }
 112                 }
 113         }
 114         if (die) {
 115                 printk(KERN_EMERG "icache coherency error\n");
 116                 for (j = 0; j <= i; j++) {
 117                         printk(KERN_EMERG
 118                             "cache address   : %08x  cache value : %08x%08x\n",
 119                              bad[j][0], bad[j][1], bad[j][2]);
 120                         printk(KERN_EMERG
 121                             "physical address: %08x  SDRAM value : %08x%08x\n",
 122                              bad[j][3], bad[j][4], bad[j][5]);
 123                 }
 124                 panic("icache coherency error");
 125         } else
 126                 printk(KERN_EMERG "icache checked, and OK\n");
 127 }