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 1.4 2004/07/12 22:38:29 dwmw2 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/config.h>
  22 #include <linux/module.h>
  23 #include <linux/types.h>
  24 #include <linux/kernel.h>
  25 #include <asm/io.h>
  26
  27 #include <linux/mtd/mtd.h>
  28 #include <linux/mtd/map.h>
  29 #include <linux/mtd/cfi.h>
  30
  31 #ifdef CONFIG_MTD_PARTITIONS
  32 #include <linux/mtd/partitions.h>
  33 #endif
  34
  35 #define DEBUG
  36
  37 #ifdef  DEBUG
  38 # define debugk(fmt,args...)    printk(fmt ,##args)
  39 #else
  40 # define debugk(fmt,args...)
  41 #endif
  42
  43
  44 #define WINDOW_ADDR0    0xFFF00000              /* 512 KiB */
  45 #define WINDOW_SIZE0    0x00080000
  46 #define BUSWIDTH0       1
  47
  48 #define WINDOW_ADDR1    0xFF000000              /* 4 MiB */
  49 #define WINDOW_SIZE1    0x00400000
  50 #define BUSWIDTH1       8
  51
  52 #define MSG_PREFIX "sbc8240:"   /* prefix for our printk()'s */
  53 #define MTDID      "sbc8240-%d" /* for mtdparts= partitioning */
  54
  55
  56 static struct map_info sbc8240_map[2] = {
  57         {
  58                 .name           = "sbc8240 Flash Bank #0",
  59                 .size           = WINDOW_SIZE0,
  60                 .bankwidth       = BUSWIDTH0,
  61         },
  62         {
  63                 .name           = "sbc8240 Flash Bank #1",
  64                 .size           = WINDOW_SIZE1,
  65                 .bankwidth       = BUSWIDTH1,
  66         }
  67 };
  68
  69 #define NUM_FLASH_BANKS (sizeof(sbc8240_map) / sizeof(struct map_info))
  70
  71 /*
  72  * The following defines the partition layout of SBC8240 boards.
  73  *
  74  * See include/linux/mtd/partitions.h for definition of the
  75  * mtd_partition structure.
  76  *
  77  * The *_max_flash_size is the maximum possible mapped flash size
  78  * which is not necessarily the actual flash size. It must correspond
  79  * to the value specified in the mapping definition defined by the
  80  * "struct map_desc *_io_desc" for the corresponding machine.
  81  */
  82
  83 #ifdef CONFIG_MTD_PARTITIONS
  84
  85 static struct mtd_partition sbc8240_uboot_partitions [] = {
  86         /* Bank 0 */
  87         {
  88                 .name = "U-boot",                       /* U-Boot Firmware      */
  89                 .offset =       0,
  90                 .size = 0x00070000,                     /*  7 x 64 KiB sectors  */
  91                 .mask_flags = MTD_WRITEABLE,            /*  force read-only     */
  92         },
  93         {
  94                 .name = "environment",                  /* U-Boot environment   */
  95                 .offset =       0x00070000,
  96                 .size = 0x00010000,                     /*  1 x 64 KiB sector   */
  97         },
  98 };
  99
 100 static struct mtd_partition sbc8240_fs_partitions [] = {
 101         {
 102                 .name = "jffs",                         /* JFFS  filesystem     */
 103                 .offset =       0,
 104                 .size = 0x003C0000,                     /*  4 * 15 * 64KiB      */
 105         },
 106         {
 107                 .name = "tmp32",
 108                 .offset =       0x003C0000,
 109                 .size = 0x00020000,                     /*  4 * 32KiB           */
 110         },
 111         {
 112                 .name = "tmp8a",
 113                 .offset =       0x003E0000,
 114                 .size = 0x00008000,                     /*  4 * 8KiB            */
 115         },
 116         {
 117                 .name = "tmp8b",
 118                 .offset =       0x003E8000,
 119                 .size = 0x00008000,                     /*  4 * 8KiB            */
 120         },
 121         {
 122                 .name = "tmp16",
 123                 .offset =       0x003F0000,
 124                 .size = 0x00010000,                     /*  4 * 16KiB           */
 125         }
 126 };
 127
 128 #define NB_OF(x) (sizeof (x) / sizeof (x[0]))
 129
 130 /* trivial struct to describe partition information */
 131 struct mtd_part_def
 132 {
 133         int nums;
 134         unsigned char *type;
 135         struct mtd_partition* mtd_part;
 136 };
 137
 138 static struct mtd_info *sbc8240_mtd[NUM_FLASH_BANKS];
 139 static struct mtd_part_def sbc8240_part_banks[NUM_FLASH_BANKS];
 140
 141
 142 #endif  /* CONFIG_MTD_PARTITIONS */
 143
 144
 145 int __init init_sbc8240_mtd (void)
 146 {
 147         static struct _cjs {
 148                 u_long addr;
 149                 u_long size;
 150         } pt[NUM_FLASH_BANKS] = {
 151                 {
 152                         .addr = WINDOW_ADDR0,
 153                         .size = WINDOW_SIZE0
 154                 },
 155                 {
 156                         .addr = WINDOW_ADDR1,
 157                         .size = WINDOW_SIZE1
 158                 },
 159         };
 160
 161         int devicesfound = 0;
 162         int i;
 163
 164         for (i = 0; i < NUM_FLASH_BANKS; i++) {
 165                 printk (KERN_NOTICE MSG_PREFIX
 166                         "Probing 0x%08lx at 0x%08lx\n", pt[i].size, pt[i].addr);
 167
 168                 sbc8240_map[i].map_priv_1 =
 169                         (unsigned long) ioremap (pt[i].addr, pt[i].size);
 170                 if (!sbc8240_map[i].map_priv_1) {
 171                         printk (MSG_PREFIX "failed to ioremap\n");
 172                         return -EIO;
 173                 }
 174                 simple_map_init(&sbc8240_mtd[i]);
 175
 176                 sbc8240_mtd[i] = do_map_probe("jedec_probe", &sbc8240_map[i]);
 177
 178                 if (sbc8240_mtd[i]) {
 179                         sbc8240_mtd[i]->module = THIS_MODULE;
 180                         devicesfound++;
 181                 }
 182         }
 183
 184         if (!devicesfound) {
 185                 printk(KERN_NOTICE MSG_PREFIX
 186                        "No suppported flash chips found!\n");
 187                 return -ENXIO;
 188         }
 189
 190 #ifdef CONFIG_MTD_PARTITIONS
 191         sbc8240_part_banks[0].mtd_part   = sbc8240_uboot_partitions;
 192         sbc8240_part_banks[0].type       = "static image";
 193         sbc8240_part_banks[0].nums       = NB_OF(sbc8240_uboot_partitions);
 194         sbc8240_part_banks[1].mtd_part   = sbc8240_fs_partitions;
 195         sbc8240_part_banks[1].type       = "static file system";
 196         sbc8240_part_banks[1].nums       = NB_OF(sbc8240_fs_partitions);
 197
 198         for (i = 0; i < NUM_FLASH_BANKS; i++) {
 199
 200                 if (!sbc8240_mtd[i]) continue;
 201                 if (sbc8240_part_banks[i].nums == 0) {
 202                         printk (KERN_NOTICE MSG_PREFIX
 203                                 "No partition info available, registering whole device\n");
 204                         add_mtd_device(sbc8240_mtd[i]);
 205                 } else {
 206                         printk (KERN_NOTICE MSG_PREFIX
 207                                 "Using %s partition definition\n", sbc8240_part_banks[i].mtd_part->name);
 208                         add_mtd_partitions (sbc8240_mtd[i],
 209                                             sbc8240_part_banks[i].mtd_part,
 210                                             sbc8240_part_banks[i].nums);
 211                 }
 212         }
 213 #else
 214         printk(KERN_NOTICE MSG_PREFIX
 215                "Registering %d flash banks at once\n", devicesfound);
 216
 217         for (i = 0; i < devicesfound; i++) {
 218                 add_mtd_device(sbc8240_mtd[i]);
 219         }
 220 #endif  /* CONFIG_MTD_PARTITIONS */
 221
 222         return devicesfound == 0 ? -ENXIO : 0;
 223 }
 224
 225 static void __exit cleanup_sbc8240_mtd (void)
 226 {
 227         int i;
 228
 229         for (i = 0; i < NUM_FLASH_BANKS; i++) {
 230                 if (sbc8240_mtd[i]) {
 231                         del_mtd_device (sbc8240_mtd[i]);
 232                         map_destroy (sbc8240_mtd[i]);
 233                 }
 234                 if (sbc8240_map[i].map_priv_1) {
 235                         iounmap ((void *) sbc8240_map[i].map_priv_1);
 236                         sbc8240_map[i].map_priv_1 = 0;
 237                 }
 238         }
 239 }
 240
 241 module_init (init_sbc8240_mtd);
 242 module_exit (cleanup_sbc8240_mtd);
 243
 244 MODULE_LICENSE ("GPL");
 245 MODULE_AUTHOR ("Carolyn Smith <carolyn.smith@tektronix.com>");
 246 MODULE_DESCRIPTION ("MTD map driver for SBC8240 boards");
 247