606ded9ff4e1963babcdec88999ef5767628451a
[linux-2.6.git] / arch / blackfin / mach-common / irqpanic.c
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 #ifdef CONFIG_DEBUG_ICACHE_CHECK
50         unsigned int cmd, tag, ca, cache_hi, cache_lo, *pa;
51         unsigned short i, j, die;
52         unsigned int bad[10][6];
53
54         /* check entire cache for coherency
55          * Since printk is in cacheable memory,
56          * don't call it until you have checked everything
57         */
58
59         die = 0;
60         i = 0;
61
62         /* check icache */
63
64         for (ca = L1_ICACHE_START; ca <= L1_ICACHE_END && i < 10; ca += 32) {
65
66                 /* Grab various address bits for the itest_cmd fields                      */
67                 cmd = (((ca & 0x3000) << 4) |   /* ca[13:12] for SBNK[1:0]             */
68                        ((ca & 0x0c00) << 16) |  /* ca[11:10] for WAYSEL[1:0]           */
69                        ((ca & 0x3f8)) | /* ca[09:03] for SET[4:0] and DW[1:0]  */
70                        0);      /* Access Tag, Read access             */
71
72                 SSYNC();
73                 bfin_write_ITEST_COMMAND(cmd);
74                 SSYNC();
75                 tag = bfin_read_ITEST_DATA0();
76                 SSYNC();
77
78                 /* if tag is marked as valid, check it */
79                 if (tag & 1) {
80                         /* The icache is arranged in 4 groups of 64-bits */
81                         for (j = 0; j < 32; j += 8) {
82                                 cmd = ((((ca + j) & 0x3000) << 4) |     /* ca[13:12] for SBNK[1:0]             */
83                                        (((ca + j) & 0x0c00) << 16) |    /* ca[11:10] for WAYSEL[1:0]           */
84                                        (((ca + j) & 0x3f8)) |   /* ca[09:03] for SET[4:0] and DW[1:0]  */
85                                        4);      /* Access Data, Read access             */
86
87                                 SSYNC();
88                                 bfin_write_ITEST_COMMAND(cmd);
89                                 SSYNC();
90
91                                 cache_hi = bfin_read_ITEST_DATA1();
92                                 cache_lo = bfin_read_ITEST_DATA0();
93
94                                 pa = ((unsigned int *)((tag & 0xffffcc00) |
95                                                        ((ca + j) & ~(0xffffcc00))));
96
97                                 /*
98                                  * Debugging this, enable
99                                  *
100                                  * printk("addr: %08x %08x%08x | %08x%08x\n",
101                                  *  ((unsigned int *)((tag & 0xffffcc00)  | ((ca+j) & ~(0xffffcc00)))),
102                                  *   cache_hi, cache_lo, *(pa+1), *pa);
103                                  */
104
105                                 if (cache_hi != *(pa + 1) || cache_lo != *pa) {
106                                         /* Since icache is not working, stay out of it, by not printing */
107                                         die = 1;
108                                         bad[i][0] = (ca + j);
109                                         bad[i][1] = cache_hi;
110                                         bad[i][2] = cache_lo;
111                                         bad[i][3] = ((tag & 0xffffcc00) |
112                                                 ((ca + j) & ~(0xffffcc00)));
113                                         bad[i][4] = *(pa + 1);
114                                         bad[i][5] = *(pa);
115                                         i++;
116                                 }
117                         }
118                 }
119         }
120         if (die) {
121                 printk(KERN_EMERG "icache coherency error\n");
122                 for (j = 0; j <= i; j++) {
123                         printk(KERN_EMERG
124                             "cache address   : %08x  cache value : %08x%08x\n",
125                              bad[j][0], bad[j][1], bad[j][2]);
126                         printk(KERN_EMERG
127                             "physical address: %08x  SDRAM value : %08x%08x\n",
128                              bad[j][3], bad[j][4], bad[j][5]);
129                 }
130                 panic("icache coherency error");
131         } else {
132                 printk(KERN_EMERG "icache checked, and OK\n");
133         }
134 #endif
135
136 }
137
138 #ifdef CONFIG_HARDWARE_PM
139 /*
140  * call the handler of Performance overflow
141  */
142 asmlinkage void pm_overflow(int irq, struct pt_regs *regs)
143 {
144         pm_overflow_handler(irq, regs);
145 }
146 #endif