drivers/mtd/maps/sbc8240.c

   1 /*
   2  * Handle mapping of the flash memory access routines on the SBC8240 board.
   3  *
   4  * Carolyn Smith, Tektronix, Inc.
   5  *
   6  * This code is GPLed
   7  *
   8  * $Id: sbc8240.c,v 1.5 2005/11/07 11:14:28 gleixner Exp $
   9  *
  10  */
  11
  12 /*
  13  * The SBC8240 has 2 flash banks.
  14  * Bank 0 is a 512 KiB AMD AM29F040B; 8 x 64 KiB sectors.
  15  * It contains the U-Boot code (7 sectors) and the environment (1 sector).
  16  * Bank 1 is 4 x 1 MiB AMD AM29LV800BT; 15 x 64 KiB sectors, 1 x 32 KiB sector,
  17  * 2 x 8 KiB sectors, 1 x 16 KiB sectors.
  18  * Both parts are JEDEC compatible.
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/types.h>
  23 #include <linux/kernel.h>
  24 #include <asm/io.h>
  25
  26 #include <linux/mtd/mtd.h>
  27 #include <linux/mtd/map.h>
  28 #include <linux/mtd/cfi.h>
  29
  30 #ifdef CONFIG_MTD_PARTITIONS
  31 #include <linux/mtd/partitions.h>
  32 #endif
  33
  34 #define DEBUG
  35
  36 #ifdef  DEBUG
  37 # define debugk(fmt,args...)    printk(fmt ,##args)
  38 #else
  39 # define debugk(fmt,args...)
  40 #endif
  41
  42
  43 #define WINDOW_ADDR0    0xFFF00000              /* 512 KiB */
  44 #define WINDOW_SIZE0    0x00080000
  45 #define BUSWIDTH0       1
  46
  47 #define WINDOW_ADDR1    0xFF000000              /* 4 MiB */
  48 #define WINDOW_SIZE1    0x00400000
  49 #define BUSWIDTH1       8
  50
  51 #define MSG_PREFIX "sbc8240:"   /* prefix for our printk()'s */
  52 #define MTDID      "sbc8240-%d" /* for mtdparts= partitioning */
  53
  54
  55 static struct map_info sbc8240_map[2] = {
  56         {
  57                 .name           = "sbc8240 Flash Bank #0",
  58                 .size           = WINDOW_SIZE0,
  59                 .bankwidth       = BUSWIDTH0,
  60         },
  61         {
  62                 .name           = "sbc8240 Flash Bank #1",
  63                 .size           = WINDOW_SIZE1,
  64                 .bankwidth       = BUSWIDTH1,
  65         }
  66 };
  67
  68 #define NUM_FLASH_BANKS ARRAY_SIZE(sbc8240_map)
  69
  70 /*
  71  * The following defines the partition layout of SBC8240 boards.
  72  *
  73  * See include/linux/mtd/partitions.h for definition of the
  74  * mtd_partition structure.
  75  *
  76  * The *_max_flash_size is the maximum possible mapped flash size
  77  * which is not necessarily the actual flash size. It must correspond
  78  * to the value specified in the mapping definition defined by the
  79  * "struct map_desc *_io_desc" for the corresponding machine.
  80  */
  81
  82 #ifdef CONFIG_MTD_PARTITIONS
  83
  84 static struct mtd_partition sbc8240_uboot_partitions [] = {
  85         /* Bank 0 */
  86         {
  87                 .name = "U-boot",                       /* U-Boot Firmware      */
  88                 .offset =       0,
  89                 .size = 0x00070000,                     /*  7 x 64 KiB sectors  */
  90                 .mask_flags = MTD_WRITEABLE,            /*  force read-only     */
  91         },
  92         {
  93                 .name = "environment",                  /* U-Boot environment   */
  94                 .offset =       0x00070000,
  95                 .size = 0x00010000,                     /*  1 x 64 KiB sector   */
  96         },
  97 };
  98
  99 static struct mtd_partition sbc8240_fs_partitions [] = {
 100         {
 101                 .name = "jffs",                         /* JFFS  filesystem     */
 102                 .offset =       0,
 103                 .size = 0x003C0000,                     /*  4 * 15 * 64KiB      */
 104         },
 105         {
 106                 .name = "tmp32",
 107                 .offset =       0x003C0000,
 108                 .size = 0x00020000,                     /*  4 * 32KiB           */
 109         },
 110         {
 111                 .name = "tmp8a",
 112                 .offset =       0x003E0000,
 113                 .size = 0x00008000,                     /*  4 * 8KiB            */
 114         },
 115         {
 116                 .name = "tmp8b",
 117                 .offset =       0x003E8000,
 118                 .size = 0x00008000,                     /*  4 * 8KiB            */
 119         },
 120         {
 121                 .name = "tmp16",
 122                 .offset =       0x003F0000,
 123                 .size = 0x00010000,                     /*  4 * 16KiB           */
 124         }
 125 };
 126
 127 /* trivial struct to describe partition information */
 128 struct mtd_part_def
 129 {
 130         int nums;
 131         unsigned char *type;
 132         struct mtd_partition* mtd_part;
 133 };
 134
 135 static struct mtd_info *sbc8240_mtd[NUM_FLASH_BANKS];
 136 static struct mtd_part_def sbc8240_part_banks[NUM_FLASH_BANKS];
 137
 138
 139 #endif  /* CONFIG_MTD_PARTITIONS */
 140
 141
 142 int __init init_sbc8240_mtd (void)
 143 {
 144         static struct _cjs {
 145                 u_long addr;
 146                 u_long size;
 147         } pt[NUM_FLASH_BANKS] = {
 148                 {
 149                         .addr = WINDOW_ADDR0,
 150                         .size = WINDOW_SIZE0
 151                 },
 152                 {
 153                         .addr = WINDOW_ADDR1,
 154                         .size = WINDOW_SIZE1
 155                 },
 156         };
 157
 158         int devicesfound = 0;
 159         int i,j;
 160
 161         for (i = 0; i < NUM_FLASH_BANKS; i++) {
 162                 printk (KERN_NOTICE MSG_PREFIX
 163                         "Probing 0x%08lx at 0x%08lx\n", pt[i].size, pt[i].addr);
 164
 165                 sbc8240_map[i].map_priv_1 =
 166                         (unsigned long) ioremap (pt[i].addr, pt[i].size);
 167                 if (!sbc8240_map[i].map_priv_1) {
 168                         printk (MSG_PREFIX "failed to ioremap\n");
 169                         for (j = 0; j < i; j++) {
 170                                 iounmap((void *) sbc8240_map[j].map_priv_1);
 171                                 sbc8240_map[j].map_priv_1 = 0;
 172                         }
 173                         return -EIO;
 174                 }
 175                 simple_map_init(&sbc8240_mtd[i]);
 176
 177                 sbc8240_mtd[i] = do_map_probe("jedec_probe", &sbc8240_map[i]);
 178
 179                 if (sbc8240_mtd[i]) {
 180                         sbc8240_mtd[i]->module = THIS_MODULE;
 181                         devicesfound++;
 182                 } else {
 183                         if (sbc8240_map[i].map_priv_1) {
 184                                 iounmap((void *) sbc8240_map[i].map_priv_1);
 185                                 sbc8240_map[i].map_priv_1 = 0;
 186                         }
 187                 }
 188         }
 189
 190         if (!devicesfound) {
 191                 printk(KERN_NOTICE MSG_PREFIX
 192                        "No suppported flash chips found!\n");
 193                 return -ENXIO;
 194         }
 195
 196 #ifdef CONFIG_MTD_PARTITIONS
 197         sbc8240_part_banks[0].mtd_part   = sbc8240_uboot_partitions;
 198         sbc8240_part_banks[0].type       = "static image";
 199         sbc8240_part_banks[0].nums       = ARRAY_SIZE(sbc8240_uboot_partitions);
 200         sbc8240_part_banks[1].mtd_part   = sbc8240_fs_partitions;
 201         sbc8240_part_banks[1].type       = "static file system";
 202         sbc8240_part_banks[1].nums       = ARRAY_SIZE(sbc8240_fs_partitions);
 203
 204         for (i = 0; i < NUM_FLASH_BANKS; i++) {
 205
 206                 if (!sbc8240_mtd[i]) continue;
 207                 if (sbc8240_part_banks[i].nums == 0) {
 208                         printk (KERN_NOTICE MSG_PREFIX
 209                                 "No partition info available, registering whole device\n");
 210                         add_mtd_device(sbc8240_mtd[i]);
 211                 } else {
 212                         printk (KERN_NOTICE MSG_PREFIX
 213                                 "Using %s partition definition\n", sbc8240_part_banks[i].mtd_part->name);
 214                         add_mtd_partitions (sbc8240_mtd[i],
 215                                             sbc8240_part_banks[i].mtd_part,
 216                                             sbc8240_part_banks[i].nums);
 217                 }
 218         }
 219 #else
 220         printk(KERN_NOTICE MSG_PREFIX
 221                "Registering %d flash banks at once\n", devicesfound);
 222
 223         for (i = 0; i < devicesfound; i++) {
 224                 add_mtd_device(sbc8240_mtd[i]);
 225         }
 226 #endif  /* CONFIG_MTD_PARTITIONS */
 227
 228         return devicesfound == 0 ? -ENXIO : 0;
 229 }
 230
 231 static void __exit cleanup_sbc8240_mtd (void)
 232 {
 233         int i;
 234
 235         for (i = 0; i < NUM_FLASH_BANKS; i++) {
 236                 if (sbc8240_mtd[i]) {
 237                         del_mtd_device (sbc8240_mtd[i]);
 238                         map_destroy (sbc8240_mtd[i]);
 239                 }
 240                 if (sbc8240_map[i].map_priv_1) {
 241                         iounmap ((void *) sbc8240_map[i].map_priv_1);
 242                         sbc8240_map[i].map_priv_1 = 0;
 243                 }
 244         }
 245 }
 246
 247 module_init (init_sbc8240_mtd);
 248 module_exit (cleanup_sbc8240_mtd);
 249
 250 MODULE_LICENSE ("GPL");
 251 MODULE_AUTHOR ("Carolyn Smith <carolyn.smith@tektronix.com>");
 252 MODULE_DESCRIPTION ("MTD map driver for SBC8240 boards");
 253