git.oblomov.eu Git - linux-2.6/blob - drivers/mtd/maps/ceiva.c

   1 /*
   2  * Ceiva flash memory driver.
   3  * Copyright (C) 2002 Rob Scott <rscott@mtrob.fdns.net>
   4  *
   5  * Note: this driver supports jedec compatible devices. Modification
   6  * for CFI compatible devices should be straight forward: change
   7  * jedec_probe to cfi_probe.
   8  *
   9  * Based on: sa1100-flash.c, which has the following copyright:
  10  * Flash memory access on SA11x0 based devices
  11  *
  12  * (C) 2000 Nicolas Pitre <nico@cam.org>
  13  *
  14  * $Id: ceiva.c,v 1.11 2004/09/16 23:27:12 gleixner Exp $
  15  */
  16
  17 #include <linux/config.h>
  18 #include <linux/module.h>
  19 #include <linux/types.h>
  20 #include <linux/ioport.h>
  21 #include <linux/kernel.h>
  22 #include <linux/init.h>
  23 #include <linux/slab.h>
  24
  25 #include <linux/mtd/mtd.h>
  26 #include <linux/mtd/map.h>
  27 #include <linux/mtd/partitions.h>
  28 #include <linux/mtd/concat.h>
  29
  30 #include <asm/hardware.h>
  31 #include <asm/mach-types.h>
  32 #include <asm/io.h>
  33 #include <asm/sizes.h>
  34
  35 /*
  36  * This isn't complete yet, so...
  37  */
  38 #define CONFIG_MTD_CEIVA_STATICMAP
  39
  40 #ifdef CONFIG_MTD_CEIVA_STATICMAP
  41 /*
  42  * See include/linux/mtd/partitions.h for definition of the mtd_partition
  43  * structure.
  44  *
  45  * Please note:
  46  *  1. The flash size given should be the largest flash size that can
  47  *     be accomodated.
  48  *
  49  *  2. The bus width must defined in clps_setup_flash.
  50  *
  51  * The MTD layer will detect flash chip aliasing and reduce the size of
  52  * the map accordingly.
  53  *
  54  */
  55
  56 #ifdef CONFIG_ARCH_CEIVA
  57 /* Flash / Partition sizing */
  58 /* For the 28F8003, we use the block mapping to calcuate the sizes */
  59 #define MAX_SIZE_KiB                  (16 + 8 + 8 + 96 + (7*128))
  60 #define BOOT_PARTITION_SIZE_KiB       (16)
  61 #define PARAMS_PARTITION_SIZE_KiB     (8)
  62 #define KERNEL_PARTITION_SIZE_KiB     (4*128)
  63 /* Use both remaing portion of first flash, and all of second flash */
  64 #define ROOT_PARTITION_SIZE_KiB       (3*128) + (8*128)
  65
  66 static struct mtd_partition ceiva_partitions[] = {
  67         {
  68                 .name = "Ceiva BOOT partition",
  69                 .size   = BOOT_PARTITION_SIZE_KiB*1024,
  70                 .offset = 0,
  71
  72         },{
  73                 .name = "Ceiva parameters partition",
  74                 .size   = PARAMS_PARTITION_SIZE_KiB*1024,
  75                 .offset = (16 + 8) * 1024,
  76         },{
  77                 .name = "Ceiva kernel partition",
  78                 .size = (KERNEL_PARTITION_SIZE_KiB)*1024,
  79                 .offset = 0x20000,
  80
  81         },{
  82                 .name = "Ceiva root filesystem partition",
  83                 .offset = MTDPART_OFS_APPEND,
  84                 .size = (ROOT_PARTITION_SIZE_KiB)*1024,
  85         }
  86 };
  87 #endif
  88
  89 static int __init clps_static_partitions(struct mtd_partition **parts)
  90 {
  91         int nb_parts = 0;
  92
  93 #ifdef CONFIG_ARCH_CEIVA
  94         if (machine_is_ceiva()) {
  95                 *parts       = ceiva_partitions;
  96                 nb_parts     = ARRAY_SIZE(ceiva_partitions);
  97         }
  98 #endif
  99         return nb_parts;
 100 }
 101 #endif
 102
 103 struct clps_info {
 104         unsigned long base;
 105         unsigned long size;
 106         int width;
 107         void *vbase;
 108         struct map_info *map;
 109         struct mtd_info *mtd;
 110         struct resource *res;
 111 };
 112
 113 #define NR_SUBMTD 4
 114
 115 static struct clps_info info[NR_SUBMTD];
 116
 117 static int __init clps_setup_mtd(struct clps_info *clps, int nr, struct mtd_info **rmtd)
 118 {
 119         struct mtd_info *subdev[nr];
 120         struct map_info *maps;
 121         int i, found = 0, ret = 0;
 122
 123         /*
 124          * Allocate the map_info structs in one go.
 125          */
 126         maps = kmalloc(sizeof(struct map_info) * nr, GFP_KERNEL);
 127         if (!maps)
 128                 return -ENOMEM;
 129         memset(maps, 0, sizeof(struct map_info) * nr);
 130         /*
 131          * Claim and then map the memory regions.
 132          */
 133         for (i = 0; i < nr; i++) {
 134                 if (clps[i].base == (unsigned long)-1)
 135                         break;
 136
 137                 clps[i].res = request_mem_region(clps[i].base, clps[i].size, "clps flash");
 138                 if (!clps[i].res) {
 139                         ret = -EBUSY;
 140                         break;
 141                 }
 142
 143                 clps[i].map = maps + i;
 144
 145                 clps[i].map->name = "clps flash";
 146                 clps[i].map->phys = clps[i].base;
 147
 148                 clps[i].vbase = ioremap(clps[i].base, clps[i].size);
 149                 if (!clps[i].vbase) {
 150                         ret = -ENOMEM;
 151                         break;
 152                 }
 153
 154                 clps[i].map->virt = (void __iomem *)clps[i].vbase;
 155                 clps[i].map->bankwidth = clps[i].width;
 156                 clps[i].map->size = clps[i].size;
 157
 158                 simple_map_init(&clps[i].map);
 159
 160                 clps[i].mtd = do_map_probe("jedec_probe", clps[i].map);
 161                 if (clps[i].mtd == NULL) {
 162                         ret = -ENXIO;
 163                         break;
 164                 }
 165                 clps[i].mtd->owner = THIS_MODULE;
 166                 subdev[i] = clps[i].mtd;
 167
 168                 printk(KERN_INFO "clps flash: JEDEC device at 0x%08lx, %dMiB, "
 169                         "%d-bit\n", clps[i].base, clps[i].mtd->size >> 20,
 170                         clps[i].width * 8);
 171                 found += 1;
 172         }
 173
 174         /*
 175          * ENXIO is special.  It means we didn't find a chip when
 176          * we probed.  We need to tear down the mapping, free the
 177          * resource and mark it as such.
 178          */
 179         if (ret == -ENXIO) {
 180                 iounmap(clps[i].vbase);
 181                 clps[i].vbase = NULL;
 182                 release_resource(clps[i].res);
 183                 clps[i].res = NULL;
 184         }
 185
 186         /*
 187          * If we found one device, don't bother with concat support.
 188          * If we found multiple devices, use concat if we have it
 189          * available, otherwise fail.
 190          */
 191         if (ret == 0 || ret == -ENXIO) {
 192                 if (found == 1) {
 193                         *rmtd = subdev[0];
 194                         ret = 0;
 195                 } else if (found > 1) {
 196                         /*
 197                          * We detected multiple devices.  Concatenate
 198                          * them together.
 199                          */
 200 #ifdef CONFIG_MTD_CONCAT
 201                         *rmtd = mtd_concat_create(subdev, found,
 202                                                   "clps flash");
 203                         if (*rmtd == NULL)
 204                                 ret = -ENXIO;
 205 #else
 206                         printk(KERN_ERR "clps flash: multiple devices "
 207                                "found but MTD concat support disabled.\n");
 208                         ret = -ENXIO;
 209 #endif
 210                 }
 211         }
 212
 213         /*
 214          * If we failed, clean up.
 215          */
 216         if (ret) {
 217                 do {
 218                         if (clps[i].mtd)
 219                                 map_destroy(clps[i].mtd);
 220                         if (clps[i].vbase)
 221                                 iounmap(clps[i].vbase);
 222                         if (clps[i].res)
 223                                 release_resource(clps[i].res);
 224                 } while (i--);
 225
 226                 kfree(maps);
 227         }
 228
 229         return ret;
 230 }
 231
 232 static void __exit clps_destroy_mtd(struct clps_info *clps, struct mtd_info *mtd)
 233 {
 234         int i;
 235
 236         del_mtd_partitions(mtd);
 237
 238         if (mtd != clps[0].mtd)
 239                 mtd_concat_destroy(mtd);
 240
 241         for (i = NR_SUBMTD; i >= 0; i--) {
 242                 if (clps[i].mtd)
 243                         map_destroy(clps[i].mtd);
 244                 if (clps[i].vbase)
 245                         iounmap(clps[i].vbase);
 246                 if (clps[i].res)
 247                         release_resource(clps[i].res);
 248         }
 249         kfree(clps[0].map);
 250 }
 251
 252 /*
 253  * We define the memory space, size, and width for the flash memory
 254  * space here.
 255  */
 256
 257 static int __init clps_setup_flash(void)
 258 {
 259         int nr;
 260
 261 #ifdef CONFIG_ARCH_CEIVA
 262         if (machine_is_ceiva()) {
 263                 info[0].base = CS0_PHYS_BASE;
 264                 info[0].size = SZ_32M;
 265                 info[0].width = CEIVA_FLASH_WIDTH;
 266                 info[1].base = CS1_PHYS_BASE;
 267                 info[1].size = SZ_32M;
 268                 info[1].width = CEIVA_FLASH_WIDTH;
 269                 nr = 2;
 270         }
 271 #endif
 272         return nr;
 273 }
 274
 275 static struct mtd_partition *parsed_parts;
 276 static const char *probes[] = { "cmdlinepart", "RedBoot", NULL };
 277
 278 static void __init clps_locate_partitions(struct mtd_info *mtd)
 279 {
 280         const char *part_type = NULL;
 281         int nr_parts = 0;
 282         do {
 283                 /*
 284                  * Partition selection stuff.
 285                  */
 286                 nr_parts = parse_mtd_partitions(mtd, probes, &parsed_parts, 0);
 287                 if (nr_parts > 0) {
 288                         part_type = "command line";
 289                         break;
 290                 }
 291 #ifdef CONFIG_MTD_CEIVA_STATICMAP
 292                 nr_parts = clps_static_partitions(&parsed_parts);
 293                 if (nr_parts > 0) {
 294                         part_type = "static";
 295                         break;
 296                 }
 297                 printk("found: %d partitions\n", nr_parts);
 298 #endif
 299         } while (0);
 300
 301         if (nr_parts == 0) {
 302                 printk(KERN_NOTICE "clps flash: no partition info "
 303                         "available, registering whole flash\n");
 304                 add_mtd_device(mtd);
 305         } else {
 306                 printk(KERN_NOTICE "clps flash: using %s partition "
 307                         "definition\n", part_type);
 308                 add_mtd_partitions(mtd, parsed_parts, nr_parts);
 309         }
 310
 311         /* Always succeeds. */
 312 }
 313
 314 static void __exit clps_destroy_partitions(void)
 315 {
 316         kfree(parsed_parts);
 317 }
 318
 319 static struct mtd_info *mymtd;
 320
 321 static int __init clps_mtd_init(void)
 322 {
 323         int ret;
 324         int nr;
 325
 326         nr = clps_setup_flash();
 327         if (nr < 0)
 328                 return nr;
 329
 330         ret = clps_setup_mtd(info, nr, &mymtd);
 331         if (ret)
 332                 return ret;
 333
 334         clps_locate_partitions(mymtd);
 335
 336         return 0;
 337 }
 338
 339 static void __exit clps_mtd_cleanup(void)
 340 {
 341         clps_destroy_mtd(info, mymtd);
 342         clps_destroy_partitions();
 343 }
 344
 345 module_init(clps_mtd_init);
 346 module_exit(clps_mtd_cleanup);
 347
 348 MODULE_AUTHOR("Rob Scott");
 349 MODULE_DESCRIPTION("Cirrus Logic JEDEC map driver");
 350 MODULE_LICENSE("GPL");