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cplbinfo.c

/*
 * File:         arch/blackfin/mach-common/cplbinfo.c
 * Based on:
 * Author:       Sonic Zhang <sonic.zhang@analog.com>
 *
 * Created:      Jan. 2005
 * Description:  Display CPLB status
 *
 * Modified:
 *               Copyright 2004-2006 Analog Devices Inc.
 *
 * Bugs:         Enter bugs at http://blackfin.uclinux.org/
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see the file COPYING, or write
 * to the Free Software Foundation, Inc.,
 * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/proc_fs.h>
#include <linux/uaccess.h>

#include <asm/current.h>
#include <asm/system.h>
#include <asm/cplb.h>
#include <asm/cplbinit.h>
#include <asm/blackfin.h>

static char page_size_string_table[][4] = { "1K", "4K", "1M", "4M" };

static char *cplb_print_entry(char *buf, struct cplb_entry *tbl, int switched)
{
      int i;
      buf += sprintf(buf, "Index\tAddress\t\tData\tSize\tU/RD\tU/WR\tS/WR\tSwitch\n");
      for (i = 0; i < MAX_CPLBS; i++) {
            unsigned long data = tbl[i].data;
            unsigned long addr = tbl[i].addr;
            if (!(data & CPLB_VALID))
                  continue;

            buf +=
                sprintf(buf,
                      "%d\t0x%08lx\t%06lx\t%s\t%c\t%c\t%c\t%c\n",
                      i, addr, data,
                      page_size_string_table[(data & 0x30000) >> 16],
                      (data & CPLB_USER_RD) ? 'Y' : 'N',
                      (data & CPLB_USER_WR) ? 'Y' : 'N',
                      (data & CPLB_SUPV_WR) ? 'Y' : 'N',
                      i < switched ? 'N' : 'Y');
      }
      buf += sprintf(buf, "\n");

      return buf;
}

int cplbinfo_proc_output(char *buf)
{
      char *p;

      p = buf;

      p += sprintf(p, "------------------ CPLB Information ------------------\n\n");

      if (bfin_read_IMEM_CONTROL() & ENICPLB) {
            p += sprintf(p, "Instruction CPLB entry:\n");
            p = cplb_print_entry(p, icplb_tbl, first_switched_icplb);
      } else
            p += sprintf(p, "Instruction CPLB is disabled.\n\n");

      if (1 || bfin_read_DMEM_CONTROL() & ENDCPLB) {
            p += sprintf(p, "Data CPLB entry:\n");
            p = cplb_print_entry(p, dcplb_tbl, first_switched_dcplb);
      } else
            p += sprintf(p, "Data CPLB is disabled.\n");

      p += sprintf(p, "ICPLB miss: %d\nICPLB supervisor miss: %d\n",
                 nr_icplb_miss, nr_icplb_supv_miss);
      p += sprintf(p, "DCPLB miss: %d\nDCPLB protection fault:%d\n",
                 nr_dcplb_miss, nr_dcplb_prot);
      p += sprintf(p, "CPLB flushes: %d\n",
                 nr_cplb_flush);

      return p - buf;
}

static int cplbinfo_read_proc(char *page, char **start, off_t off,
                        int count, int *eof, void *data)
{
      int len;

      len = cplbinfo_proc_output(page);
      if (len <= off + count)
            *eof = 1;
      *start = page + off;
      len -= off;
      if (len > count)
            len = count;
      if (len < 0)
            len = 0;
      return len;
}

static int __init cplbinfo_init(void)
{
      struct proc_dir_entry *entry;

      entry = create_proc_entry("cplbinfo", 0, NULL);
      if (!entry)
            return -ENOMEM;

      entry->read_proc = cplbinfo_read_proc;
      entry->data = NULL;

      return 0;
}

static void __exit cplbinfo_exit(void)
{
      remove_proc_entry("cplbinfo", NULL);
}

module_init(cplbinfo_init);
module_exit(cplbinfo_exit);

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