drivers/mtd/cfi_mtd.c

   1 /*
   2  * (C) Copyright 2008 Semihalf
   3  *
   4  * Written by: Piotr Ziecik <kosmo@semihalf.com>
   5  *
   6  * SPDX-License-Identifier:     GPL-2.0+
   7  */
   8
   9 #include <common.h>
  10 #include <flash.h>
  11 #include <malloc.h>
  12
  13 #include <linux/errno.h>
  14 #include <linux/mtd/mtd.h>
  15 #include <linux/mtd/concat.h>
  16 #include <mtd/cfi_flash.h>
  17
  18 static struct mtd_info cfi_mtd_info[CFI_MAX_FLASH_BANKS];
  19 static char cfi_mtd_names[CFI_MAX_FLASH_BANKS][16];
  20 #ifdef CONFIG_MTD_CONCAT
  21 static char c_mtd_name[16];
  22 #endif
  23
  24 static int cfi_mtd_erase(struct mtd_info *mtd, struct erase_info *instr)
  25 {
  26         flash_info_t *fi = mtd->priv;
  27         size_t a_start = fi->start[0] + instr->addr;
  28         size_t a_end = a_start + instr->len;
  29         int s_first = -1;
  30         int s_last = -1;
  31         int error, sect;
  32
  33         for (sect = 0; sect < fi->sector_count; sect++) {
  34                 if (a_start == fi->start[sect])
  35                         s_first = sect;
  36
  37                 if (sect < fi->sector_count - 1) {
  38                         if (a_end == fi->start[sect + 1]) {
  39                                 s_last = sect;
  40                                 break;
  41                         }
  42                 } else {
  43                         s_last = sect;
  44                         break;
  45                 }
  46         }
  47
  48         if (s_first >= 0 && s_first <= s_last) {
  49                 instr->state = MTD_ERASING;
  50
  51                 flash_set_verbose(0);
  52                 error = flash_erase(fi, s_first, s_last);
  53                 flash_set_verbose(1);
  54
  55                 if (error) {
  56                         instr->state = MTD_ERASE_FAILED;
  57                         return -EIO;
  58                 }
  59
  60                 instr->state = MTD_ERASE_DONE;
  61                 mtd_erase_callback(instr);
  62                 return 0;
  63         }
  64
  65         return -EINVAL;
  66 }
  67
  68 static int cfi_mtd_read(struct mtd_info *mtd, loff_t from, size_t len,
  69         size_t *retlen, u_char *buf)
  70 {
  71         flash_info_t *fi = mtd->priv;
  72         u_char *f = (u_char*)(fi->start[0]) + from;
  73
  74         memcpy(buf, f, len);
  75         *retlen = len;
  76
  77         return 0;
  78 }
  79
  80 static int cfi_mtd_write(struct mtd_info *mtd, loff_t to, size_t len,
  81         size_t *retlen, const u_char *buf)
  82 {
  83         flash_info_t *fi = mtd->priv;
  84         u_long t = fi->start[0] + to;
  85         int error;
  86
  87         flash_set_verbose(0);
  88         error = write_buff(fi, (u_char*)buf, t, len);
  89         flash_set_verbose(1);
  90
  91         if (!error) {
  92                 *retlen = len;
  93                 return 0;
  94         }
  95
  96         return -EIO;
  97 }
  98
  99 static void cfi_mtd_sync(struct mtd_info *mtd)
 100 {
 101         /*
 102          * This function should wait until all pending operations
 103          * finish. However this driver is fully synchronous, so
 104          * this function returns immediately
 105          */
 106 }
 107
 108 static int cfi_mtd_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
 109 {
 110         flash_info_t *fi = mtd->priv;
 111
 112         flash_set_verbose(0);
 113         flash_protect(FLAG_PROTECT_SET, fi->start[0] + ofs,
 114                                         fi->start[0] + ofs + len - 1, fi);
 115         flash_set_verbose(1);
 116
 117         return 0;
 118 }
 119
 120 static int cfi_mtd_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
 121 {
 122         flash_info_t *fi = mtd->priv;
 123
 124         flash_set_verbose(0);
 125         flash_protect(FLAG_PROTECT_CLEAR, fi->start[0] + ofs,
 126                                         fi->start[0] + ofs + len - 1, fi);
 127         flash_set_verbose(1);
 128
 129         return 0;
 130 }
 131
 132 static int cfi_mtd_set_erasesize(struct mtd_info *mtd, flash_info_t *fi)
 133 {
 134         int sect_size = 0;
 135         int sect_size_old = 0;
 136         int sect;
 137         int regions = 0;
 138         int numblocks = 0;
 139         ulong offset;
 140         ulong base_addr;
 141
 142         /*
 143          * First detect the number of eraseregions so that we can allocate
 144          * the array of eraseregions correctly
 145          */
 146         for (sect = 0; sect < fi->sector_count; sect++) {
 147                 if (sect_size_old != flash_sector_size(fi, sect))
 148                         regions++;
 149                 sect_size_old = flash_sector_size(fi, sect);
 150         }
 151
 152         switch (regions) {
 153         case 0:
 154                 return 1;
 155         case 1: /* flash has uniform erase size */
 156                 mtd->numeraseregions = 0;
 157                 mtd->erasesize = sect_size_old;
 158                 return 0;
 159         }
 160
 161         mtd->numeraseregions = regions;
 162         mtd->eraseregions = malloc(sizeof(struct mtd_erase_region_info) * regions);
 163
 164         /*
 165          * Now detect the largest sector and fill the eraseregions
 166          */
 167         regions = 0;
 168         base_addr = offset = fi->start[0];
 169         sect_size_old = flash_sector_size(fi, 0);
 170         for (sect = 0; sect < fi->sector_count; sect++) {
 171                 if (sect_size_old != flash_sector_size(fi, sect)) {
 172                         mtd->eraseregions[regions].offset = offset - base_addr;
 173                         mtd->eraseregions[regions].erasesize = sect_size_old;
 174                         mtd->eraseregions[regions].numblocks = numblocks;
 175                         /* Now start counting the next eraseregions */
 176                         numblocks = 0;
 177                         regions++;
 178                         offset = fi->start[sect];
 179                 }
 180                 numblocks++;
 181
 182                 /*
 183                  * Select the largest sector size as erasesize (e.g. for UBI)
 184                  */
 185                 if (flash_sector_size(fi, sect) > sect_size)
 186                         sect_size = flash_sector_size(fi, sect);
 187
 188                 sect_size_old = flash_sector_size(fi, sect);
 189         }
 190
 191         /*
 192          * Set the last region
 193          */
 194         mtd->eraseregions[regions].offset = offset - base_addr;
 195         mtd->eraseregions[regions].erasesize = sect_size_old;
 196         mtd->eraseregions[regions].numblocks = numblocks;
 197
 198         mtd->erasesize = sect_size;
 199
 200         return 0;
 201 }
 202
 203 int cfi_mtd_init(void)
 204 {
 205         struct mtd_info *mtd;
 206         flash_info_t *fi;
 207         int error, i;
 208 #ifdef CONFIG_MTD_CONCAT
 209         int devices_found = 0;
 210         struct mtd_info *mtd_list[CONFIG_SYS_MAX_FLASH_BANKS];
 211 #endif
 212
 213         for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++) {
 214                 fi = &flash_info[i];
 215                 mtd = &cfi_mtd_info[i];
 216
 217                 memset(mtd, 0, sizeof(struct mtd_info));
 218
 219                 error = cfi_mtd_set_erasesize(mtd, fi);
 220                 if (error)
 221                         continue;
 222
 223                 sprintf(cfi_mtd_names[i], "nor%d", i);
 224                 mtd->name               = cfi_mtd_names[i];
 225                 mtd->type               = MTD_NORFLASH;
 226                 mtd->flags              = MTD_CAP_NORFLASH;
 227                 mtd->size               = fi->size;
 228                 mtd->writesize          = 1;
 229                 mtd->writebufsize       = mtd->writesize;
 230
 231                 mtd->_erase             = cfi_mtd_erase;
 232                 mtd->_read              = cfi_mtd_read;
 233                 mtd->_write             = cfi_mtd_write;
 234                 mtd->_sync              = cfi_mtd_sync;
 235                 mtd->_lock              = cfi_mtd_lock;
 236                 mtd->_unlock            = cfi_mtd_unlock;
 237                 mtd->priv               = fi;
 238
 239                 if (add_mtd_device(mtd))
 240                         return -ENOMEM;
 241
 242 #ifdef CONFIG_MTD_CONCAT
 243                 mtd_list[devices_found++] = mtd;
 244 #endif
 245         }
 246
 247 #ifdef CONFIG_MTD_CONCAT
 248         if (devices_found > 1) {
 249                 /*
 250                  * We detected multiple devices. Concatenate them together.
 251                  */
 252                 sprintf(c_mtd_name, "nor%d", devices_found);
 253                 mtd = mtd_concat_create(mtd_list, devices_found, c_mtd_name);
 254
 255                 if (mtd == NULL)
 256                         return -ENXIO;
 257
 258                 if (add_mtd_device(mtd))
 259                         return -ENOMEM;
 260         }
 261 #endif /* CONFIG_MTD_CONCAT */
 262
 263         return 0;
 264 }