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