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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/blackfin.h>

#define CPLB_I 1
#define CPLB_D 2

#define SYNC_SYS    SSYNC()
#define SYNC_CORE   CSYNC()

#define CPLB_BIT_PAGESIZE 0x30000

static int page_size_table[4] = {
      0x00000400,       /* 1K */
      0x00001000,       /* 4K */
      0x00100000,       /* 1M */
      0x00400000        /* 4M */
};

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

static int cplb_find_entry(unsigned long *cplb_addr,
                     unsigned long *cplb_data, unsigned long addr,
                     unsigned long data)
{
      int ii;

      for (ii = 0; ii < 16; ii++)
            if (addr >= cplb_addr[ii] && addr < cplb_addr[ii] +
                page_size_table[(cplb_data[ii] & CPLB_BIT_PAGESIZE) >> 16]
                  && (cplb_data[ii] == data))
                  return ii;

      return -1;
}

static char *cplb_print_entry(char *buf, int type)
{
      unsigned long *p_addr = dpdt_table;
      unsigned long *p_data = dpdt_table + 1;
      unsigned long *p_icount = dpdt_swapcount_table;
      unsigned long *p_ocount = dpdt_swapcount_table + 1;
      unsigned long *cplb_addr = (unsigned long *)DCPLB_ADDR0;
      unsigned long *cplb_data = (unsigned long *)DCPLB_DATA0;
      int entry = 0, used_cplb = 0;

      if (type == CPLB_I) {
            buf += sprintf(buf, "Instruction CPLB entry:\n");
            p_addr = ipdt_table;
            p_data = ipdt_table + 1;
            p_icount = ipdt_swapcount_table;
            p_ocount = ipdt_swapcount_table + 1;
            cplb_addr = (unsigned long *)ICPLB_ADDR0;
            cplb_data = (unsigned long *)ICPLB_DATA0;
      } else
            buf += sprintf(buf, "Data CPLB entry:\n");

      buf += sprintf(buf, "Address\t\tData\tSize\tValid\tLocked\tSwapin\tiCount\toCount\n");

      while (*p_addr != 0xffffffff) {
            entry = cplb_find_entry(cplb_addr, cplb_data, *p_addr, *p_data);
            if (entry >= 0)
                  used_cplb |= 1 << entry;

            buf +=
                sprintf(buf,
                      "0x%08lx\t0x%05lx\t%s\t%c\t%c\t%2d\t%ld\t%ld\n",
                      *p_addr, *p_data,
                      page_size_string_table[(*p_data & 0x30000) >> 16],
                      (*p_data & CPLB_VALID) ? 'Y' : 'N',
                      (*p_data & CPLB_LOCK) ? 'Y' : 'N', entry, *p_icount,
                      *p_ocount);

            p_addr += 2;
            p_data += 2;
            p_icount += 2;
            p_ocount += 2;
      }

      if (used_cplb != 0xffff) {
            buf += sprintf(buf, "Unused/mismatched CPLBs:\n");

            for (entry = 0; entry < 16; entry++)
                  if (0 == ((1 << entry) & used_cplb)) {
                        int flags = cplb_data[entry];
                        buf +=
                            sprintf(buf,
                                  "%2d: 0x%08lx\t0x%05x\t%s\t%c\t%c\n",
                                  entry, cplb_addr[entry], flags,
                                  page_size_string_table[(flags &
                                                    0x30000) >>
                                                   16],
                                  (flags & CPLB_VALID) ? 'Y' : 'N',
                                  (flags & CPLB_LOCK) ? 'Y' : 'N');
                  }
      }

      buf += sprintf(buf, "\n");

      return buf;
}

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

      p = buf;

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

      if (bfin_read_IMEM_CONTROL() & ENICPLB)
            p = cplb_print_entry(p, CPLB_I);
      else
            p += sprintf(p, "Instruction CPLB is disabled.\n\n");

      if (bfin_read_DMEM_CONTROL() & ENDCPLB)
            p = cplb_print_entry(p, CPLB_D);
      else
            p += sprintf(p, "Data CPLB is disabled.\n");

      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 cplbinfo_write_proc(struct file *file, const char __user *buffer,
                         unsigned long count, void *data)
{
      printk(KERN_INFO "Reset the CPLB swap in/out counts.\n");
      memset(ipdt_swapcount_table, 0, MAX_SWITCH_I_CPLBS * sizeof(unsigned long));
      memset(dpdt_swapcount_table, 0, MAX_SWITCH_D_CPLBS * sizeof(unsigned long));

      return count;
}

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->write_proc = cplbinfo_write_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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