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 #define CPLB_I 1
  43 #define CPLB_D 2
  44
  45 #define SYNC_SYS    SSYNC()
  46 #define SYNC_CORE   CSYNC()
  47
  48 #define CPLB_BIT_PAGESIZE 0x30000
  49
  50 static char page_size_string_table[][4] = { "1K", "4K", "1M", "4M" };
  51
  52 static char *cplb_print_entry(char *buf, struct cplb_entry *tbl, int switched)
  53 {
  54         int i;
  55         buf += sprintf(buf, "Index\tAddress\t\tData\tSize\tU/RD\tU/WR\tS/WR\tSwitch\n");
  56         for (i = 0; i < MAX_CPLBS; i++) {
  57                 unsigned long data = tbl[i].data;
  58                 unsigned long addr = tbl[i].addr;
  59                 if (!(data & CPLB_VALID))
  60                         continue;
  61
  62                 buf +=
  63                     sprintf(buf,
  64                             "%d\t0x%08lx\t%06lx\t%s\t%c\t%c\t%c\t%c\n",
  65                             i, addr, data,
  66                             page_size_string_table[(data & 0x30000) >> 16],
  67                             (data & CPLB_USER_RD) ? 'Y' : 'N',
  68                             (data & CPLB_USER_WR) ? 'Y' : 'N',
  69                             (data & CPLB_SUPV_WR) ? 'Y' : 'N',
  70                             i < switched ? 'N' : 'Y');
  71         }
  72         buf += sprintf(buf, "\n");
  73
  74         return buf;
  75 }
  76
  77 int cplbinfo_proc_output(char *buf)
  78 {
  79         char *p;
  80
  81         p = buf;
  82
  83         p += sprintf(p, "------------------ CPLB Information ------------------\n\n");
  84
  85         if (bfin_read_IMEM_CONTROL() & ENICPLB) {
  86                 p += sprintf(p, "Instruction CPLB entry:\n");
  87                 p = cplb_print_entry(p, icplb_tbl, first_switched_icplb);
  88         } else
  89                 p += sprintf(p, "Instruction CPLB is disabled.\n\n");
  90
  91         if (1 || bfin_read_DMEM_CONTROL() & ENDCPLB) {
  92                 p += sprintf(p, "Data CPLB entry:\n");
  93                 p = cplb_print_entry(p, dcplb_tbl, first_switched_dcplb);
  94         } else
  95                 p += sprintf(p, "Data CPLB is disabled.\n");
  96
  97         p += sprintf(p, "ICPLB miss: %d\nICPLB supervisor miss: %d\n",
  98                      nr_icplb_miss, nr_icplb_supv_miss);
  99         p += sprintf(p, "DCPLB miss: %d\nDCPLB protection fault:%d\n",
 100                      nr_dcplb_miss, nr_dcplb_prot);
 101         p += sprintf(p, "CPLB flushes: %d\n",
 102                      nr_cplb_flush);
 103
 104         return p - buf;
 105 }
 106
 107 static int cplbinfo_read_proc(char *page, char **start, off_t off,
 108                               int count, int *eof, void *data)
 109 {
 110         int len;
 111
 112         len = cplbinfo_proc_output(page);
 113         if (len <= off + count)
 114                 *eof = 1;
 115         *start = page + off;
 116         len -= off;
 117         if (len > count)
 118                 len = count;
 119         if (len < 0)
 120                 len = 0;
 121         return len;
 122 }
 123
 124 static int __init cplbinfo_init(void)
 125 {
 126         struct proc_dir_entry *entry;
 127
 128         entry = create_proc_entry("cplbinfo", 0, NULL);
 129         if (!entry)
 130                 return -ENOMEM;
 131
 132         entry->read_proc = cplbinfo_read_proc;
 133         entry->data = NULL;
 134
 135         return 0;
 136 }
 137
 138 static void __exit cplbinfo_exit(void)
 139 {
 140         remove_proc_entry("cplbinfo", NULL);
 141 }
 142
 143 module_init(cplbinfo_init);
 144 module_exit(cplbinfo_exit);