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 - 1; sect++) {
  47                 if (a_start == fi->start[sect])
  48                         s_first = sect;
  49
  50                 if (a_end == fi->start[sect + 1]) {
  51                         s_last = sect;
  52                         break;
  53                 }
  54         }
  55
  56         if (s_first >= 0 && s_first <= s_last) {
  57                 instr->state = MTD_ERASING;
  58
  59                 flash_set_verbose(0);
  60                 error = flash_erase(fi, s_first, s_last);
  61                 flash_set_verbose(1);
  62
  63                 if (error) {
  64                         instr->state = MTD_ERASE_FAILED;
  65                         return -EIO;
  66                 }
  67
  68                 instr->state = MTD_ERASE_DONE;
  69                 mtd_erase_callback(instr);
  70                 return 0;
  71         }
  72
  73         return -EINVAL;
  74 }
  75
  76 static int cfi_mtd_read(struct mtd_info *mtd, loff_t from, size_t len,
  77         size_t *retlen, u_char *buf)
  78 {
  79         flash_info_t *fi = mtd->priv;
  80         u_char *f = (u_char*)(fi->start[0]) + from;
  81
  82         memcpy(buf, f, len);
  83         *retlen = len;
  84
  85         return 0;
  86 }
  87
  88 static int cfi_mtd_write(struct mtd_info *mtd, loff_t to, size_t len,
  89         size_t *retlen, const u_char *buf)
  90 {
  91         flash_info_t *fi = mtd->priv;
  92         u_long t = fi->start[0] + to;
  93         int error;
  94
  95         flash_set_verbose(0);
  96         error = write_buff(fi, (u_char*)buf, t, len);
  97         flash_set_verbose(1);
  98
  99         if (!error) {
 100                 *retlen = len;
 101                 return 0;
 102         }
 103
 104         return -EIO;
 105 }
 106
 107 static void cfi_mtd_sync(struct mtd_info *mtd)
 108 {
 109         /*
 110          * This function should wait until all pending operations
 111          * finish. However this driver is fully synchronous, so
 112          * this function returns immediately
 113          */
 114 }
 115
 116 static int cfi_mtd_lock(struct mtd_info *mtd, loff_t ofs, size_t len)
 117 {
 118         flash_info_t *fi = mtd->priv;
 119
 120         flash_set_verbose(0);
 121         flash_protect(FLAG_PROTECT_SET, fi->start[0] + ofs,
 122                                         fi->start[0] + ofs + len - 1, fi);
 123         flash_set_verbose(1);
 124
 125         return 0;
 126 }
 127
 128 static int cfi_mtd_unlock(struct mtd_info *mtd, loff_t ofs, size_t len)
 129 {
 130         flash_info_t *fi = mtd->priv;
 131
 132         flash_set_verbose(0);
 133         flash_protect(FLAG_PROTECT_CLEAR, fi->start[0] + ofs,
 134                                         fi->start[0] + ofs + len - 1, fi);
 135         flash_set_verbose(1);
 136
 137         return 0;
 138 }
 139
 140 static int cfi_mtd_set_erasesize(struct mtd_info *mtd, flash_info_t *fi)
 141 {
 142         int sect_size = 0;
 143         int sect;
 144
 145         /*
 146          * Select the largest sector size as erasesize (e.g. for UBI)
 147          */
 148         for (sect = 0; sect < fi->sector_count; sect++) {
 149                 if (flash_sector_size(fi, sect) > sect_size)
 150                         sect_size = flash_sector_size(fi, sect);
 151         }
 152
 153         mtd->erasesize = sect_size;
 154
 155         return 0;
 156 }
 157
 158 int cfi_mtd_init(void)
 159 {
 160         struct mtd_info *mtd;
 161         flash_info_t *fi;
 162         int error, i;
 163
 164         for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++) {
 165                 fi = &flash_info[i];
 166                 mtd = &cfi_mtd_info[i];
 167
 168                 memset(mtd, 0, sizeof(struct mtd_info));
 169
 170                 error = cfi_mtd_set_erasesize(mtd, fi);
 171                 if (error)
 172                         continue;
 173
 174                 sprintf(cfi_mtd_names[i], "nor%d", i);
 175                 mtd->name               = cfi_mtd_names[i];
 176                 mtd->type               = MTD_NORFLASH;
 177                 mtd->flags              = MTD_CAP_NORFLASH;
 178                 mtd->size               = fi->size;
 179                 mtd->writesize          = 1;
 180
 181                 mtd->erase              = cfi_mtd_erase;
 182                 mtd->read               = cfi_mtd_read;
 183                 mtd->write              = cfi_mtd_write;
 184                 mtd->sync               = cfi_mtd_sync;
 185                 mtd->lock               = cfi_mtd_lock;
 186                 mtd->unlock             = cfi_mtd_unlock;
 187                 mtd->priv               = fi;
 188
 189                 if (add_mtd_device(mtd))
 190                         return -ENOMEM;
 191         }
 192
 193         return 0;
 194 }