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