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
  35 #include <asm/current.h>
  36 #include <asm/uaccess.h>
  37 #include <asm/system.h>
  38
  39 #include <asm/cplb.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 int page_size_table[4] = {
  51         0x00000400,             /* 1K */
  52         0x00001000,             /* 4K */
  53         0x00100000,             /* 1M */
  54         0x00400000              /* 4M */
  55 };
  56
  57 static char page_size_string_table[][4] = { "1K", "4K", "1M", "4M" };
  58
  59 static int cplb_find_entry(unsigned long *cplb_addr,
  60                            unsigned long *cplb_data, unsigned long addr,
  61                            unsigned long data)
  62 {
  63         int ii;
  64
  65         for (ii = 0; ii < 16; ii++)
  66                 if (addr >= cplb_addr[ii] && addr < cplb_addr[ii] +
  67                     page_size_table[(cplb_data[ii] & CPLB_BIT_PAGESIZE) >> 16]
  68                         && (cplb_data[ii] == data))
  69                         return ii;
  70
  71         return -1;
  72 }
  73
  74 static char *cplb_print_entry(char *buf, int type)
  75 {
  76         unsigned long *p_addr = dpdt_table;
  77         unsigned long *p_data = dpdt_table + 1;
  78         unsigned long *p_icount = dpdt_swapcount_table;
  79         unsigned long *p_ocount = dpdt_swapcount_table + 1;
  80         unsigned long *cplb_addr = (unsigned long *)DCPLB_ADDR0;
  81         unsigned long *cplb_data = (unsigned long *)DCPLB_DATA0;
  82         int entry = 0, used_cplb = 0;
  83
  84         if (type == CPLB_I) {
  85                 buf += sprintf(buf, "Instrction CPLB entry:\n");
  86                 p_addr = ipdt_table;
  87                 p_data = ipdt_table + 1;
  88                 p_icount = ipdt_swapcount_table;
  89                 p_ocount = ipdt_swapcount_table + 1;
  90                 cplb_addr = (unsigned long *)ICPLB_ADDR0;
  91                 cplb_data = (unsigned long *)ICPLB_DATA0;
  92         } else
  93                 buf += sprintf(buf, "Data CPLB entry:\n");
  94
  95         buf += sprintf(buf, "Address\t\tData\tSize\tValid\tLocked\tSwapin\
  96 \tiCount\toCount\n");
  97
  98         while (*p_addr != 0xffffffff) {
  99                 entry = cplb_find_entry(cplb_addr, cplb_data, *p_addr, *p_data);
 100                 if (entry >= 0)
 101                         used_cplb |= 1 << entry;
 102
 103                 buf +=
 104                     sprintf(buf,
 105                             "0x%08lx\t0x%05lx\t%s\t%c\t%c\t%2d\t%ld\t%ld\n",
 106                             *p_addr, *p_data,
 107                             page_size_string_table[(*p_data & 0x30000) >> 16],
 108                             (*p_data & CPLB_VALID) ? 'Y' : 'N',
 109                             (*p_data & CPLB_LOCK) ? 'Y' : 'N', entry, *p_icount,
 110                             *p_ocount);
 111
 112                 p_addr += 2;
 113                 p_data += 2;
 114                 p_icount += 2;
 115                 p_ocount += 2;
 116         }
 117
 118         if (used_cplb != 0xffff) {
 119                 buf += sprintf(buf, "Unused/mismatched CPLBs:\n");
 120
 121                 for (entry = 0; entry < 16; entry++)
 122                         if (0 == ((1 << entry) & used_cplb)) {
 123                                 int flags = cplb_data[entry];
 124                                 buf +=
 125                                     sprintf(buf,
 126                                             "%2d: 0x%08lx\t0x%05x\t%s\t%c\t%c\n",
 127                                             entry, cplb_addr[entry], flags,
 128                                             page_size_string_table[(flags &
 129                                                                     0x30000) >>
 130                                                                    16],
 131                                             (flags & CPLB_VALID) ? 'Y' : 'N',
 132                                             (flags & CPLB_LOCK) ? 'Y' : 'N');
 133                         }
 134         }
 135
 136         buf += sprintf(buf, "\n");
 137
 138         return buf;
 139 }
 140
 141 static int cplbinfo_proc_output(char *buf)
 142 {
 143         char *p;
 144
 145         p = buf;
 146
 147         p += sprintf(p,
 148                      "------------------ CPLB Information ------------------\n\n");
 149
 150         if (bfin_read_IMEM_CONTROL() & ENICPLB)
 151                 p = cplb_print_entry(p, CPLB_I);
 152         else
 153                 p += sprintf(p, "Instruction CPLB is disabled.\n\n");
 154
 155         if (bfin_read_DMEM_CONTROL() & ENDCPLB)
 156                 p = cplb_print_entry(p, CPLB_D);
 157         else
 158                 p += sprintf(p, "Data CPLB is disabled.\n");
 159
 160         return p - buf;
 161 }
 162
 163 static int cplbinfo_read_proc(char *page, char **start, off_t off,
 164                               int count, int *eof, void *data)
 165 {
 166         int len;
 167
 168         len = cplbinfo_proc_output(page);
 169         if (len <= off + count)
 170                 *eof = 1;
 171         *start = page + off;
 172         len -= off;
 173         if (len > count)
 174                 len = count;
 175         if (len < 0)
 176                 len = 0;
 177         return len;
 178 }
 179
 180 static int cplbinfo_write_proc(struct file *file, const char __user *buffer,
 181                                unsigned long count, void *data)
 182 {
 183         printk(KERN_INFO "Reset the CPLB swap in/out counts.\n");
 184         memset(ipdt_swapcount_table, 0, MAX_SWITCH_I_CPLBS * sizeof(unsigned long));
 185         memset(dpdt_swapcount_table, 0, MAX_SWITCH_D_CPLBS * sizeof(unsigned long));
 186
 187         return count;
 188 }
 189
 190 static int __init cplbinfo_init(void)
 191 {
 192         struct proc_dir_entry *entry;
 193
 194         if ((entry = create_proc_entry("cplbinfo", 0, NULL)) == NULL) {
 195                 return -ENOMEM;
 196         }
 197
 198         entry->read_proc = cplbinfo_read_proc;
 199         entry->write_proc = cplbinfo_write_proc;
 200         entry->data = NULL;
 201
 202         return 0;
 203 }
 204
 205 static void __exit cplbinfo_exit(void)
 206 {
 207         remove_proc_entry("cplbinfo", NULL);
 208 }
 209
 210 module_init(cplbinfo_init);
 211 module_exit(cplbinfo_exit);