arch/blackfin/kernel/cplb-mpu/cplbinfo.c

   1 /*
   2  * File:         arch/blackfin/mach-common/cplbinfo.c
   3  * Based on:
   4  * Author:       Sonic Zhang <sonic.zhang@analog.com>
   5  *
   6  * Created:      Jan. 2005
   7  * Description:  Display CPLB status
   8  *
   9  * Modified:
  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.h>
  32 #include <linux/init.h>
  33 #include <linux/proc_fs.h>
  34 #include <linux/uaccess.h>
  35
  36 #include <asm/current.h>
  37 #include <asm/system.h>
  38 #include <asm/cplb.h>
  39 #include <asm/cplbinit.h>
  40 #include <asm/blackfin.h>
  41
  42 static char page_size_string_table[][4] = { "1K", "4K", "1M", "4M" };
  43
  44 static char *cplb_print_entry(char *buf, struct cplb_entry *tbl, int switched)
  45 {
  46         int i;
  47         buf += sprintf(buf, "Index\tAddress\t\tData\tSize\tU/RD\tU/WR\tS/WR\tSwitch\n");
  48         for (i = 0; i < MAX_CPLBS; i++) {
  49                 unsigned long data = tbl[i].data;
  50                 unsigned long addr = tbl[i].addr;
  51                 if (!(data & CPLB_VALID))
  52                         continue;
  53
  54                 buf +=
  55                     sprintf(buf,
  56                             "%d\t0x%08lx\t%06lx\t%s\t%c\t%c\t%c\t%c\n",
  57                             i, addr, data,
  58                             page_size_string_table[(data & 0x30000) >> 16],
  59                             (data & CPLB_USER_RD) ? 'Y' : 'N',
  60                             (data & CPLB_USER_WR) ? 'Y' : 'N',
  61                             (data & CPLB_SUPV_WR) ? 'Y' : 'N',
  62                             i < switched ? 'N' : 'Y');
  63         }
  64         buf += sprintf(buf, "\n");
  65
  66         return buf;
  67 }
  68
  69 int cplbinfo_proc_output(char *buf)
  70 {
  71         char *p;
  72
  73         p = buf;
  74
  75         p += sprintf(p, "------------------ CPLB Information ------------------\n\n");
  76
  77         if (bfin_read_IMEM_CONTROL() & ENICPLB) {
  78                 p += sprintf(p, "Instruction CPLB entry:\n");
  79                 p = cplb_print_entry(p, icplb_tbl, first_switched_icplb);
  80         } else
  81                 p += sprintf(p, "Instruction CPLB is disabled.\n\n");
  82
  83         if (1 || bfin_read_DMEM_CONTROL() & ENDCPLB) {
  84                 p += sprintf(p, "Data CPLB entry:\n");
  85                 p = cplb_print_entry(p, dcplb_tbl, first_switched_dcplb);
  86         } else
  87                 p += sprintf(p, "Data CPLB is disabled.\n");
  88
  89         p += sprintf(p, "ICPLB miss: %d\nICPLB supervisor miss: %d\n",
  90                      nr_icplb_miss, nr_icplb_supv_miss);
  91         p += sprintf(p, "DCPLB miss: %d\nDCPLB protection fault:%d\n",
  92                      nr_dcplb_miss, nr_dcplb_prot);
  93         p += sprintf(p, "CPLB flushes: %d\n",
  94                      nr_cplb_flush);
  95
  96         return p - buf;
  97 }
  98
  99 static int cplbinfo_read_proc(char *page, char **start, off_t off,
 100                               int count, int *eof, void *data)
 101 {
 102         int len;
 103
 104         len = cplbinfo_proc_output(page);
 105         if (len <= off + count)
 106                 *eof = 1;
 107         *start = page + off;
 108         len -= off;
 109         if (len > count)
 110                 len = count;
 111         if (len < 0)
 112                 len = 0;
 113         return len;
 114 }
 115
 116 static int __init cplbinfo_init(void)
 117 {
 118         struct proc_dir_entry *entry;
 119
 120         entry = create_proc_entry("cplbinfo", 0, NULL);
 121         if (!entry)
 122                 return -ENOMEM;
 123
 124         entry->read_proc = cplbinfo_read_proc;
 125         entry->data = NULL;
 126
 127         return 0;
 128 }
 129
 130 static void __exit cplbinfo_exit(void)
 131 {
 132         remove_proc_entry("cplbinfo", NULL);
 133 }
 134
 135 module_init(cplbinfo_init);
 136 module_exit(cplbinfo_exit);