drivers/mtd/maps/tqm834x.c

   1 /*
   2  * drivers/mtd/maps/tqm834x.c
   3  *
   4  * MTD mapping driver for TQM834x boards
   5  *
   6  * Copyright 2005 Wolfgang Denk, DENX Software Engineering, <wd@denx.de>.
   7  *
   8  * This file is licensed under the terms of the GNU General Public License
   9  * version 2.  This program is licensed "as is" without any warranty of any
  10  * kind, whether express or implied.
  11  *
  12  */
  13
  14 #include <linux/config.h>
  15 #include <linux/init.h>
  16 #include <linux/module.h>
  17 #include <linux/types.h>
  18 #include <linux/kernel.h>
  19 #include <linux/slab.h>
  20 #include <asm/io.h>
  21 #include <asm/ppcboot.h>
  22
  23 #include <linux/mtd/mtd.h>
  24 #include <linux/mtd/map.h>
  25 #include <linux/mtd/partitions.h>
  26
  27 #define FLASH_BANK_MAX  2
  28
  29 extern unsigned char __res[];
  30
  31 /* trivial struct to describe partition information */
  32 struct mtd_part_def
  33 {
  34         int nums;
  35         unsigned char *type;
  36         struct mtd_partition* mtd_part;
  37 };
  38
  39 static struct mtd_info* mtd_banks[FLASH_BANK_MAX];
  40 static struct map_info* map_banks[FLASH_BANK_MAX];
  41 static struct mtd_part_def part_banks[FLASH_BANK_MAX];
  42
  43 static unsigned long num_banks;
  44 static unsigned long start_scan_addr;
  45
  46 #ifdef CONFIG_MTD_PARTITIONS
  47 /*
  48  * The following defines the partition layout of TQM834x boards.
  49  *
  50  * See include/linux/mtd/partitions.h for definition of the
  51  * mtd_partition structure.
  52  *
  53  * Assume minimal initial size of 4 MiB per bank, will be updated
  54  * later in init_tqm834x_mtd() routine.
  55  */
  56
  57 /* Partition definition for the first flash bank which is always present. */
  58 static struct mtd_partition tqm834x_partitions_bank1[] = {
  59         {
  60                 .name   = "u-boot",             /* u-boot firmware      */
  61                 .offset = 0x00000000,
  62                 .size   = 0x00040000,           /* 256 KiB              */
  63                 /*mask_flags: MTD_WRITEABLE,     * force read-only      */
  64         },
  65         {
  66                 .name   = "env",                /* u-boot environment   */
  67                 .offset = 0x00040000,
  68                 .size   = 0x00020000,           /* 128 KiB              */
  69                 /*mask_flags: MTD_WRITEABLE,     * force read-only      */
  70         },
  71         {
  72                 .name   = "kernel",             /* linux kernel image   */
  73                 .offset = 0x00060000,
  74                 .size   = 0x00100000,           /* 1 MiB                */
  75                 /*mask_flags: MTD_WRITEABLE,     * force read-only      */
  76         },
  77         {
  78                 .name   = "initrd",             /* ramdisk image        */
  79                 .offset = 0x00160000,
  80                 .size   = 0x00200000,           /* 2 MiB                */
  81         },
  82         {
  83                 .name   = "user",               /* user data            */
  84                 .offset = 0x00360000,
  85                 .size   = 0x000a0000,           /* remaining space      */
  86                 /* NOTE: this parttion size is re-calcated in           */
  87                 /* init_tqm834x_mtd() to cover actual remaining space.  */
  88         },
  89 };
  90
  91 /* Partition definition for the second flash bank which may be present on some
  92  * TQM834x boards.
  93  */
  94 static struct mtd_partition tqm834x_partitions_bank2[] = {
  95         {
  96                 .name   = "jffs2",              /* jffs2 filesystem     */
  97                 .offset = 0x00000000,
  98                 .size   = 0x00400000,           /* whole device         */
  99                 /* NOTE: this parttion size is re-calcated in           */
 100                 /* init_tqm834x_mtd() to cover actual device size.      */
 101         },
 102 };
 103
 104 #endif  /* CONFIG_MTD_PARTITIONS */
 105
 106 static int __init init_tqm834x_mtd(void)
 107 {
 108         int idx = 0, ret = 0;
 109         unsigned long flash_addr, flash_size, mtd_size = 0;
 110
 111         /* pointer to TQM834x board info data */
 112         bd_t *bd = (bd_t *)__res;
 113 #ifdef CONFIG_MTD_CMDLINE_PARTS
 114         int n;
 115         char mtdid[4];
 116         const char *part_probes[] = { "cmdlinepart", NULL };
 117 #endif
 118
 119         flash_addr = bd->bi_flashstart;
 120         flash_size = bd->bi_flashsize;
 121
 122         /* request maximum flash size address space */
 123         start_scan_addr = (unsigned long)ioremap(flash_addr, flash_size);
 124         if (!start_scan_addr) {
 125                 printk("%s: Failed to ioremap address: 0x%lx\n",
 126                        __FUNCTION__, flash_addr);
 127                 return -EIO;
 128         }
 129
 130         for(idx = 0 ; idx < FLASH_BANK_MAX ; idx++) {
 131                 if (mtd_size >= flash_size)
 132                         break;
 133
 134                 pr_debug("%s: chip probing count %d\n", __FUNCTION__, idx);
 135
 136                 map_banks[idx] =
 137                         (struct map_info *)kmalloc(sizeof(struct map_info),
 138                                                    GFP_KERNEL);
 139                 if (map_banks[idx] == NULL) {
 140                         ret = -ENOMEM;
 141                         goto error_mem;
 142                 }
 143                 memset((void *)map_banks[idx], 0, sizeof(struct map_info));
 144                 map_banks[idx]->name = (char *)kmalloc(16, GFP_KERNEL);
 145                 if (map_banks[idx]->name == NULL) {
 146                         ret = -ENOMEM;
 147                         goto error_mem;
 148                 }
 149                 memset((void *)map_banks[idx]->name, 0, 16);
 150
 151                 sprintf(map_banks[idx]->name, "TQM834x-%d", idx);
 152                 map_banks[idx]->size = flash_size;
 153                 map_banks[idx]->bankwidth = 4;
 154
 155                 simple_map_init(map_banks[idx]);
 156
 157                 map_banks[idx]->virt = (void __iomem *)
 158                         (start_scan_addr + ((idx > 0) ?
 159                         (mtd_banks[idx-1] ? mtd_banks[idx-1]->size : 0) : 0));
 160                 map_banks[idx]->phys =
 161                         flash_addr + ((idx > 0) ?
 162                         (mtd_banks[idx-1] ? mtd_banks[idx-1]->size : 0) : 0);
 163
 164                 /* start to probe flash chips */
 165                 mtd_banks[idx] = do_map_probe("cfi_probe", map_banks[idx]);
 166                 if (mtd_banks[idx]) {
 167                         mtd_banks[idx]->owner = THIS_MODULE;
 168                         mtd_size += mtd_banks[idx]->size;
 169                         num_banks++;
 170                         pr_debug("%s: bank %ld, name: %s, size: %d bytes \n",
 171                                  __FUNCTION__, num_banks,
 172                                  mtd_banks[idx]->name, mtd_banks[idx]->size);
 173                 }
 174         }
 175
 176         /* no supported flash chips found */
 177         if (!num_banks) {
 178                 printk("TQM834x: No supported flash chips found!\n");
 179                 ret = -ENXIO;
 180                 goto error_mem;
 181         }
 182
 183 #ifdef CONFIG_MTD_PARTITIONS
 184         /*
 185          * Select static partition definitions
 186          */
 187         n = ARRAY_SIZE(tqm834x_partitions_bank1);
 188         part_banks[0].mtd_part  = tqm834x_partitions_bank1;
 189         part_banks[0].type      = "static image bank1";
 190         part_banks[0].nums      = n;
 191
 192         /* update last partition size to cover actual remaining space */
 193         tqm834x_partitions_bank1[n - 1].size =
 194                 mtd_banks[0]->size -
 195                 tqm834x_partitions_bank1[n - 1].offset;
 196
 197         /* check if we have second bank? */
 198         if (num_banks == 2) {
 199                 n = ARRAY_SIZE(tqm834x_partitions_bank2);
 200                 part_banks[1].mtd_part  = tqm834x_partitions_bank2;
 201                 part_banks[1].type      = "static image bank2";
 202                 part_banks[1].nums      = n;
 203
 204                 /* update last partition size to cover actual remaining space */
 205                 tqm834x_partitions_bank2[n - 1].size =
 206                         mtd_banks[1]->size -
 207                         tqm834x_partitions_bank2[n - 1].offset;
 208         }
 209
 210         for(idx = 0; idx < num_banks ; idx++) {
 211 #ifdef CONFIG_MTD_CMDLINE_PARTS
 212                 sprintf(mtdid, "%d", idx);
 213                 n = parse_mtd_partitions(mtd_banks[idx],
 214                                          part_probes,
 215                                          &part_banks[idx].mtd_part,
 216                                          0);
 217                 pr_debug("%s: %d command line partitions on bank %s\n",
 218                          __FUNCTION__, n, mtdid);
 219                 if (n > 0) {
 220                         part_banks[idx].type = "command line";
 221                         part_banks[idx].nums = n;
 222                 }
 223 #endif  /* CONFIG_MTD_CMDLINE_PARTS */
 224                 if (part_banks[idx].nums == 0) {
 225                         printk(KERN_NOTICE
 226                                "TQM834x flash bank %d: no partition info "
 227                                "available, registering whole device\n", idx);
 228                         add_mtd_device(mtd_banks[idx]);
 229                 } else {
 230                         printk(KERN_NOTICE
 231                                "TQM834x flash bank %d: Using %s partition "
 232                                "definition\n", idx, part_banks[idx].type);
 233                         add_mtd_partitions(mtd_banks[idx],
 234                                            part_banks[idx].mtd_part,
 235                                            part_banks[idx].nums);
 236                 }
 237         }
 238 #else   /* ! CONFIG_MTD_PARTITIONS */
 239         printk(KERN_NOTICE "TQM834x flash: registering %d flash banks "
 240                         "at once\n", num_banks);
 241
 242         for(idx = 0 ; idx < num_banks ; idx++)
 243                 add_mtd_device(mtd_banks[idx]);
 244
 245 #endif  /* CONFIG_MTD_PARTITIONS */
 246
 247         return 0;
 248 error_mem:
 249         for (idx = 0 ; idx < FLASH_BANK_MAX ; idx++) {
 250                 if (map_banks[idx] != NULL) {
 251                         if (map_banks[idx]->name != NULL) {
 252                                 kfree(map_banks[idx]->name);
 253                                 map_banks[idx]->name = NULL;
 254                         }
 255                         kfree(map_banks[idx]);
 256                         map_banks[idx] = NULL;
 257                 }
 258         }
 259
 260         iounmap((void *)start_scan_addr);
 261
 262         return ret;
 263 }
 264
 265 static void __exit cleanup_tqm834x_mtd(void)
 266 {
 267         unsigned int idx = 0;
 268         for(idx = 0 ; idx < num_banks ; idx++) {
 269                 /* destroy mtd_info previously allocated */
 270                 if (mtd_banks[idx]) {
 271                         del_mtd_partitions(mtd_banks[idx]);
 272                         map_destroy(mtd_banks[idx]);
 273                 }
 274
 275                 /* release map_info not used anymore */
 276                 kfree(map_banks[idx]->name);
 277                 kfree(map_banks[idx]);
 278         }
 279
 280         if (start_scan_addr) {
 281                 iounmap((void *)start_scan_addr);
 282                 start_scan_addr = 0;
 283         }
 284 }
 285
 286 module_init(init_tqm834x_mtd);
 287 module_exit(cleanup_tqm834x_mtd);
 288
 289 MODULE_LICENSE("GPL");
 290 MODULE_AUTHOR("Wolfgang Denk <wd@denx.de>");
 291 MODULE_DESCRIPTION("MTD map driver for TQM834x boards");