arch/blackfin/mach-common/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/blackfin.h>
  40
  41 #define CPLB_I 1
  42 #define CPLB_D 2
  43
  44 #define SYNC_SYS    SSYNC()
  45 #define SYNC_CORE   CSYNC()
  46
  47 #define CPLB_BIT_PAGESIZE 0x30000
  48
  49 static int page_size_table[4] = {
  50         0x00000400,             /* 1K */
  51         0x00001000,             /* 4K */
  52         0x00100000,             /* 1M */
  53         0x00400000              /* 4M */
  54 };
  55
  56 static char page_size_string_table[][4] = { "1K", "4K", "1M", "4M" };
  57
  58 static int cplb_find_entry(unsigned long *cplb_addr,
  59                            unsigned long *cplb_data, unsigned long addr,
  60                            unsigned long data)
  61 {
  62         int ii;
  63
  64         for (ii = 0; ii < 16; ii++)
  65                 if (addr >= cplb_addr[ii] && addr < cplb_addr[ii] +
  66                     page_size_table[(cplb_data[ii] & CPLB_BIT_PAGESIZE) >> 16]
  67                         && (cplb_data[ii] == data))
  68                         return ii;
  69
  70         return -1;
  71 }
  72
  73 static char *cplb_print_entry(char *buf, int type)
  74 {
  75         unsigned long *p_addr = dpdt_table;
  76         unsigned long *p_data = dpdt_table + 1;
  77         unsigned long *p_icount = dpdt_swapcount_table;
  78         unsigned long *p_ocount = dpdt_swapcount_table + 1;
  79         unsigned long *cplb_addr = (unsigned long *)DCPLB_ADDR0;
  80         unsigned long *cplb_data = (unsigned long *)DCPLB_DATA0;
  81         int entry = 0, used_cplb = 0;
  82
  83         if (type == CPLB_I) {
  84                 buf += sprintf(buf, "Instruction CPLB entry:\n");
  85                 p_addr = ipdt_table;
  86                 p_data = ipdt_table + 1;
  87                 p_icount = ipdt_swapcount_table;
  88                 p_ocount = ipdt_swapcount_table + 1;
  89                 cplb_addr = (unsigned long *)ICPLB_ADDR0;
  90                 cplb_data = (unsigned long *)ICPLB_DATA0;
  91         } else
  92                 buf += sprintf(buf, "Data CPLB entry:\n");
  93
  94         buf += sprintf(buf, "Address\t\tData\tSize\tValid\tLocked\tSwapin\tiCount\toCount\n");
  95
  96         while (*p_addr != 0xffffffff) {
  97                 entry = cplb_find_entry(cplb_addr, cplb_data, *p_addr, *p_data);
  98                 if (entry >= 0)
  99                         used_cplb |= 1 << entry;
 100
 101                 buf +=
 102                     sprintf(buf,
 103                             "0x%08lx\t0x%05lx\t%s\t%c\t%c\t%2d\t%ld\t%ld\n",
 104                             *p_addr, *p_data,
 105                             page_size_string_table[(*p_data & 0x30000) >> 16],
 106                             (*p_data & CPLB_VALID) ? 'Y' : 'N',
 107                             (*p_data & CPLB_LOCK) ? 'Y' : 'N', entry, *p_icount,
 108                             *p_ocount);
 109
 110                 p_addr += 2;
 111                 p_data += 2;
 112                 p_icount += 2;
 113                 p_ocount += 2;
 114         }
 115
 116         if (used_cplb != 0xffff) {
 117                 buf += sprintf(buf, "Unused/mismatched CPLBs:\n");
 118
 119                 for (entry = 0; entry < 16; entry++)
 120                         if (0 == ((1 << entry) & used_cplb)) {
 121                                 int flags = cplb_data[entry];
 122                                 buf +=
 123                                     sprintf(buf,
 124                                             "%2d: 0x%08lx\t0x%05x\t%s\t%c\t%c\n",
 125                                             entry, cplb_addr[entry], flags,
 126                                             page_size_string_table[(flags &
 127                                                                     0x30000) >>
 128                                                                    16],
 129                                             (flags & CPLB_VALID) ? 'Y' : 'N',
 130                                             (flags & CPLB_LOCK) ? 'Y' : 'N');
 131                         }
 132         }
 133
 134         buf += sprintf(buf, "\n");
 135
 136         return buf;
 137 }
 138
 139 static int cplbinfo_proc_output(char *buf)
 140 {
 141         char *p;
 142
 143         p = buf;
 144
 145         p += sprintf(p, "------------------ CPLB Information ------------------\n\n");
 146
 147         if (bfin_read_IMEM_CONTROL() & ENICPLB)
 148                 p = cplb_print_entry(p, CPLB_I);
 149         else
 150                 p += sprintf(p, "Instruction CPLB is disabled.\n\n");
 151
 152         if (bfin_read_DMEM_CONTROL() & ENDCPLB)
 153                 p = cplb_print_entry(p, CPLB_D);
 154         else
 155                 p += sprintf(p, "Data CPLB is disabled.\n");
 156
 157         return p - buf;
 158 }
 159
 160 static int cplbinfo_read_proc(char *page, char **start, off_t off,
 161                               int count, int *eof, void *data)
 162 {
 163         int len;
 164
 165         len = cplbinfo_proc_output(page);
 166         if (len <= off + count)
 167                 *eof = 1;
 168         *start = page + off;
 169         len -= off;
 170         if (len > count)
 171                 len = count;
 172         if (len < 0)
 173                 len = 0;
 174         return len;
 175 }
 176
 177 static int cplbinfo_write_proc(struct file *file, const char __user *buffer,
 178                                unsigned long count, void *data)
 179 {
 180         printk(KERN_INFO "Reset the CPLB swap in/out counts.\n");
 181         memset(ipdt_swapcount_table, 0, MAX_SWITCH_I_CPLBS * sizeof(unsigned long));
 182         memset(dpdt_swapcount_table, 0, MAX_SWITCH_D_CPLBS * sizeof(unsigned long));
 183
 184         return count;
 185 }
 186
 187 static int __init cplbinfo_init(void)
 188 {
 189         struct proc_dir_entry *entry;
 190
 191         entry = create_proc_entry("cplbinfo", 0, NULL);
 192         if (!entry)
 193                 return -ENOMEM;
 194
 195         entry->read_proc = cplbinfo_read_proc;
 196         entry->write_proc = cplbinfo_write_proc;
 197         entry->data = NULL;
 198
 199         return 0;
 200 }
 201
 202 static void __exit cplbinfo_exit(void)
 203 {
 204         remove_proc_entry("cplbinfo", NULL);
 205 }
 206
 207 module_init(cplbinfo_init);
 208 module_exit(cplbinfo_exit);