drivers/mtd/cfi_mtd.c

   1 /*
   2  * (C) Copyright 2008 Semihalf
   3  *
   4  * Written by: Piotr Ziecik <kosmo@semihalf.com>
   5  *
   6  * See file CREDITS for list of people who contributed to this
   7  * project.
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License as
  11  * published by the Free Software Foundation; either version 2 of
  12  * the License, or (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  22  * MA 02111-1307 USA
  23  *
  24  */
  25
  26 #include <common.h>
  27 #include <flash.h>
  28
  29 #include <asm/errno.h>
  30 #include <linux/mtd/mtd.h>
  31
  32 extern flash_info_t flash_info[];
  33
  34 static struct mtd_info cfi_mtd_info[CONFIG_SYS_MAX_FLASH_BANKS];
  35 static char cfi_mtd_names[CONFIG_SYS_MAX_FLASH_BANKS][16];
  36
  37 static int cfi_mtd_erase(struct mtd_info *mtd, struct erase_info *instr)
  38 {
  39         flash_info_t *fi = mtd->priv;
  40         size_t a_start = fi->start[0] + instr->addr;
  41         size_t a_end = a_start + instr->len;
  42         int s_first = -1;
  43         int s_last = -1;
  44         int error, sect;
  45
  46         for (sect = 0; sect < fi->sector_count; sect++) {
  47                 if (a_start == fi->start[sect])
  48                         s_first = sect;
  49
  50                 if (sect < fi->sector_count - 1) {
  51                         if (a_end == fi->start[sect + 1]) {
  52                                 s_last = sect;
  53                                 break;
  54                         }
  55                 } else {
  56                         s_last = sect;
  57                         break;
  58                 }
  59         }
  60
  61         if (s_first >= 0 && s_first <= s_last) {
  62                 instr->state = MTD_ERASING;
  63
  64                 flash_set_verbose(0);
  65                 error = flash_erase(fi, s_first, s_last);
  66                 flash_set_verbose(1);
  67
  68                 if (error) {
  69                         instr->state = MTD_ERASE_FAILED;
  70                         return -EIO;
  71                 }
  72
  73                 instr->state = MTD_ERASE_DONE;
  74                 mtd_erase_callback(instr);
  75                 return 0;
  76         }
  77
  78         return -EINVAL;
  79 }
  80
  81 static int cfi_mtd_read(struct mtd_info *mtd, loff_t from, size_t len,
  82         size_t *retlen, u_char *buf)
  83 {
  84         flash_info_t *fi = mtd->priv;
  85         u_char *f = (u_char*)(fi->start[0]) + from;
  86
  87         memcpy(buf, f, len);
  88         *retlen = len;
  89
  90         return 0;
  91 }
  92
  93 static int cfi_mtd_write(struct mtd_info *mtd, loff_t to, size_t len,
  94         size_t *retlen, const u_char *buf)
  95 {
  96         flash_info_t *fi = mtd->priv;
  97         u_long t = fi->start[0] + to;
  98         int error;
  99
 100         flash_set_verbose(0);
 101         error = write_buff(fi, (u_char*)buf, t, len);
 102         flash_set_verbose(1);
 103
 104         if (!error) {
 105                 *retlen = len;
 106                 return 0;
 107         }
 108
 109         return -EIO;
 110 }
 111
 112 static void cfi_mtd_sync(struct mtd_info *mtd)
 113 {
 114         /*
 115          * This function should wait until all pending operations
 116          * finish. However this driver is fully synchronous, so
 117          * this function returns immediately
 118          */
 119 }
 120
 121 static int cfi_mtd_lock(struct mtd_info *mtd, loff_t ofs, size_t len)
 122 {
 123         flash_info_t *fi = mtd->priv;
 124
 125         flash_set_verbose(0);
 126         flash_protect(FLAG_PROTECT_SET, fi->start[0] + ofs,
 127                                         fi->start[0] + ofs + len - 1, fi);
 128         flash_set_verbose(1);
 129
 130         return 0;
 131 }
 132
 133 static int cfi_mtd_unlock(struct mtd_info *mtd, loff_t ofs, size_t len)
 134 {
 135         flash_info_t *fi = mtd->priv;
 136
 137         flash_set_verbose(0);
 138         flash_protect(FLAG_PROTECT_CLEAR, fi->start[0] + ofs,
 139                                         fi->start[0] + ofs + len - 1, fi);
 140         flash_set_verbose(1);
 141
 142         return 0;
 143 }
 144
 145 static int cfi_mtd_set_erasesize(struct mtd_info *mtd, flash_info_t *fi)
 146 {
 147         int sect_size = 0;
 148         int sect;
 149
 150         /*
 151          * Select the largest sector size as erasesize (e.g. for UBI)
 152          */
 153         for (sect = 0; sect < fi->sector_count; sect++) {
 154                 if (flash_sector_size(fi, sect) > sect_size)
 155                         sect_size = flash_sector_size(fi, sect);
 156         }
 157
 158         mtd->erasesize = sect_size;
 159
 160         return 0;
 161 }
 162
 163 int cfi_mtd_init(void)
 164 {
 165         struct mtd_info *mtd;
 166         flash_info_t *fi;
 167         int error, i;
 168
 169         for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++) {
 170                 fi = &flash_info[i];
 171                 mtd = &cfi_mtd_info[i];
 172
 173                 memset(mtd, 0, sizeof(struct mtd_info));
 174
 175                 error = cfi_mtd_set_erasesize(mtd, fi);
 176                 if (error)
 177                         continue;
 178
 179                 sprintf(cfi_mtd_names[i], "nor%d", i);
 180                 mtd->name               = cfi_mtd_names[i];
 181                 mtd->type               = MTD_NORFLASH;
 182                 mtd->flags              = MTD_CAP_NORFLASH;
 183                 mtd->size               = fi->size;
 184                 mtd->writesize          = 1;
 185
 186                 mtd->erase              = cfi_mtd_erase;
 187                 mtd->read               = cfi_mtd_read;
 188                 mtd->write              = cfi_mtd_write;
 189                 mtd->sync               = cfi_mtd_sync;
 190                 mtd->lock               = cfi_mtd_lock;
 191                 mtd->unlock             = cfi_mtd_unlock;
 192                 mtd->priv               = fi;
 193
 194                 if (add_mtd_device(mtd))
 195                         return -ENOMEM;
 196         }
 197
 198         return 0;
 199 }