release/src-rt-6.x.4708/linux/linux-2.6.36/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@fluxnic.net>
  13  *
  14  */
  15
  16 #include <linux/module.h>
  17 #include <linux/types.h>
  18 #include <linux/ioport.h>
  19 #include <linux/kernel.h>
  20 #include <linux/init.h>
  21 #include <linux/slab.h>
  22
  23 #include <linux/mtd/mtd.h>
  24 #include <linux/mtd/map.h>
  25 #include <linux/mtd/partitions.h>
  26 #include <linux/mtd/concat.h>
  27
  28 #include <mach/hardware.h>
  29 #include <asm/mach-types.h>
  30 #include <asm/io.h>
  31 #include <asm/sizes.h>
  32
  33 /*
  34  * This isn't complete yet, so...
  35  */
  36 #define CONFIG_MTD_CEIVA_STATICMAP
  37
  38 #ifdef CONFIG_MTD_CEIVA_STATICMAP
  39 /*
  40  * See include/linux/mtd/partitions.h for definition of the mtd_partition
  41  * structure.
  42  *
  43  * Please note:
  44  *  1. The flash size given should be the largest flash size that can
  45  *     be accomodated.
  46  *
  47  *  2. The bus width must defined in clps_setup_flash.
  48  *
  49  * The MTD layer will detect flash chip aliasing and reduce the size of
  50  * the map accordingly.
  51  *
  52  */
  53
  54 #ifdef CONFIG_ARCH_CEIVA
  55 /* Flash / Partition sizing */
  56 /* For the 28F8003, we use the block mapping to calcuate the sizes */
  57 #define MAX_SIZE_KiB                  (16 + 8 + 8 + 96 + (7*128))
  58 #define BOOT_PARTITION_SIZE_KiB       (16)
  59 #define PARAMS_PARTITION_SIZE_KiB     (8)
  60 #define KERNEL_PARTITION_SIZE_KiB     (4*128)
  61 /* Use both remaing portion of first flash, and all of second flash */
  62 #define ROOT_PARTITION_SIZE_KiB       (3*128) + (8*128)
  63
  64 static struct mtd_partition ceiva_partitions[] = {
  65         {
  66                 .name = "Ceiva BOOT partition",
  67                 .size   = BOOT_PARTITION_SIZE_KiB*1024,
  68                 .offset = 0,
  69
  70         },{
  71                 .name = "Ceiva parameters partition",
  72                 .size   = PARAMS_PARTITION_SIZE_KiB*1024,
  73                 .offset = (16 + 8) * 1024,
  74         },{
  75                 .name = "Ceiva kernel partition",
  76                 .size = (KERNEL_PARTITION_SIZE_KiB)*1024,
  77                 .offset = 0x20000,
  78
  79         },{
  80                 .name = "Ceiva root filesystem partition",
  81                 .offset = MTDPART_OFS_APPEND,
  82                 .size = (ROOT_PARTITION_SIZE_KiB)*1024,
  83         }
  84 };
  85 #endif
  86
  87 static int __init clps_static_partitions(struct mtd_partition **parts)
  88 {
  89         int nb_parts = 0;
  90
  91 #ifdef CONFIG_ARCH_CEIVA
  92         if (machine_is_ceiva()) {
  93                 *parts       = ceiva_partitions;
  94                 nb_parts     = ARRAY_SIZE(ceiva_partitions);
  95         }
  96 #endif
  97         return nb_parts;
  98 }
  99 #endif
 100
 101 struct clps_info {
 102         unsigned long base;
 103         unsigned long size;
 104         int width;
 105         void *vbase;
 106         struct map_info *map;
 107         struct mtd_info *mtd;
 108         struct resource *res;
 109 };
 110
 111 #define NR_SUBMTD 4
 112
 113 static struct clps_info info[NR_SUBMTD];
 114
 115 static int __init clps_setup_mtd(struct clps_info *clps, int nr, struct mtd_info **rmtd)
 116 {
 117         struct mtd_info *subdev[nr];
 118         struct map_info *maps;
 119         int i, found = 0, ret = 0;
 120
 121         /*
 122          * Allocate the map_info structs in one go.
 123          */
 124         maps = kzalloc(sizeof(struct map_info) * nr, GFP_KERNEL);
 125         if (!maps)
 126                 return -ENOMEM;
 127         /*
 128          * Claim and then map the memory regions.
 129          */
 130         for (i = 0; i < nr; i++) {
 131                 if (clps[i].base == (unsigned long)-1)
 132                         break;
 133
 134                 clps[i].res = request_mem_region(clps[i].base, clps[i].size, "clps flash");
 135                 if (!clps[i].res) {
 136                         ret = -EBUSY;
 137                         break;
 138                 }
 139
 140                 clps[i].map = maps + i;
 141
 142                 clps[i].map->name = "clps flash";
 143                 clps[i].map->phys = clps[i].base;
 144
 145                 clps[i].vbase = ioremap(clps[i].base, clps[i].size);
 146                 if (!clps[i].vbase) {
 147                         ret = -ENOMEM;
 148                         break;
 149                 }
 150
 151                 clps[i].map->virt = (void __iomem *)clps[i].vbase;
 152                 clps[i].map->bankwidth = clps[i].width;
 153                 clps[i].map->size = clps[i].size;
 154
 155                 simple_map_init(&clps[i].map);
 156
 157                 clps[i].mtd = do_map_probe("jedec_probe", clps[i].map);
 158                 if (clps[i].mtd == NULL) {
 159                         ret = -ENXIO;
 160                         break;
 161                 }
 162                 clps[i].mtd->owner = THIS_MODULE;
 163                 subdev[i] = clps[i].mtd;
 164
 165                 printk(KERN_INFO "clps flash: JEDEC device at 0x%08lx, %dMiB, "
 166                         "%d-bit\n", clps[i].base, clps[i].mtd->size >> 20,
 167                         clps[i].width * 8);
 168                 found += 1;
 169         }
 170
 171         /*
 172          * ENXIO is special.  It means we didn't find a chip when
 173          * we probed.  We need to tear down the mapping, free the
 174          * resource and mark it as such.
 175          */
 176         if (ret == -ENXIO) {
 177                 iounmap(clps[i].vbase);
 178                 clps[i].vbase = NULL;
 179                 release_resource(clps[i].res);
 180                 clps[i].res = NULL;
 181         }
 182
 183         /*
 184          * If we found one device, don't bother with concat support.
 185          * If we found multiple devices, use concat if we have it
 186          * available, otherwise fail.
 187          */
 188         if (ret == 0 || ret == -ENXIO) {
 189                 if (found == 1) {
 190                         *rmtd = subdev[0];
 191                         ret = 0;
 192                 } else if (found > 1) {
 193                         /*
 194                          * We detected multiple devices.  Concatenate
 195                          * them together.
 196                          */
 197 #ifdef CONFIG_MTD_CONCAT
 198                         *rmtd = mtd_concat_create(subdev, found,
 199                                                   "clps flash");
 200                         if (*rmtd == NULL)
 201                                 ret = -ENXIO;
 202 #else
 203                         printk(KERN_ERR "clps flash: multiple devices "
 204                                "found but MTD concat support disabled.\n");
 205                         ret = -ENXIO;
 206 #endif
 207                 }
 208         }
 209
 210         /*
 211          * If we failed, clean up.
 212          */
 213         if (ret) {
 214                 do {
 215                         if (clps[i].mtd)
 216                                 map_destroy(clps[i].mtd);
 217                         if (clps[i].vbase)
 218                                 iounmap(clps[i].vbase);
 219                         if (clps[i].res)
 220                                 release_resource(clps[i].res);
 221                 } while (i--);
 222
 223                 kfree(maps);
 224         }
 225
 226         return ret;
 227 }
 228
 229 static void __exit clps_destroy_mtd(struct clps_info *clps, struct mtd_info *mtd)
 230 {
 231         int i;
 232
 233         del_mtd_partitions(mtd);
 234
 235         if (mtd != clps[0].mtd)
 236                 mtd_concat_destroy(mtd);
 237
 238         for (i = NR_SUBMTD; i >= 0; i--) {
 239                 if (clps[i].mtd)
 240                         map_destroy(clps[i].mtd);
 241                 if (clps[i].vbase)
 242                         iounmap(clps[i].vbase);
 243                 if (clps[i].res)
 244                         release_resource(clps[i].res);
 245         }
 246         kfree(clps[0].map);
 247 }
 248
 249 /*
 250  * We define the memory space, size, and width for the flash memory
 251  * space here.
 252  */
 253
 254 static int __init clps_setup_flash(void)
 255 {
 256         int nr = 0;
 257
 258 #ifdef CONFIG_ARCH_CEIVA
 259         if (machine_is_ceiva()) {
 260                 info[0].base = CS0_PHYS_BASE;
 261                 info[0].size = SZ_32M;
 262                 info[0].width = CEIVA_FLASH_WIDTH;
 263                 info[1].base = CS1_PHYS_BASE;
 264                 info[1].size = SZ_32M;
 265                 info[1].width = CEIVA_FLASH_WIDTH;
 266                 nr = 2;
 267         }
 268 #endif
 269         return nr;
 270 }
 271
 272 static struct mtd_partition *parsed_parts;
 273 static const char *probes[] = { "cmdlinepart", "RedBoot", NULL };
 274
 275 static void __init clps_locate_partitions(struct mtd_info *mtd)
 276 {
 277         const char *part_type = NULL;
 278         int nr_parts = 0;
 279         do {
 280                 /*
 281                  * Partition selection stuff.
 282                  */
 283                 nr_parts = parse_mtd_partitions(mtd, probes, &parsed_parts, 0);
 284                 if (nr_parts > 0) {
 285                         part_type = "command line";
 286                         break;
 287                 }
 288 #ifdef CONFIG_MTD_CEIVA_STATICMAP
 289                 nr_parts = clps_static_partitions(&parsed_parts);
 290                 if (nr_parts > 0) {
 291                         part_type = "static";
 292                         break;
 293                 }
 294                 printk("found: %d partitions\n", nr_parts);
 295 #endif
 296         } while (0);
 297
 298         if (nr_parts == 0) {
 299                 printk(KERN_NOTICE "clps flash: no partition info "
 300                         "available, registering whole flash\n");
 301                 add_mtd_device(mtd);
 302         } else {
 303                 printk(KERN_NOTICE "clps flash: using %s partition "
 304                         "definition\n", part_type);
 305                 add_mtd_partitions(mtd, parsed_parts, nr_parts);
 306         }
 307
 308         /* Always succeeds. */
 309 }
 310
 311 static void __exit clps_destroy_partitions(void)
 312 {
 313         kfree(parsed_parts);
 314 }
 315
 316 static struct mtd_info *mymtd;
 317
 318 static int __init clps_mtd_init(void)
 319 {
 320         int ret;
 321         int nr;
 322
 323         nr = clps_setup_flash();
 324         if (nr < 0)
 325                 return nr;
 326
 327         ret = clps_setup_mtd(info, nr, &mymtd);
 328         if (ret)
 329                 return ret;
 330
 331         clps_locate_partitions(mymtd);
 332
 333         return 0;
 334 }
 335
 336 static void __exit clps_mtd_cleanup(void)
 337 {
 338         clps_destroy_mtd(info, mymtd);
 339         clps_destroy_partitions();
 340 }
 341
 342 module_init(clps_mtd_init);
 343 module_exit(clps_mtd_cleanup);
 344
 345 MODULE_AUTHOR("Rob Scott");
 346 MODULE_DESCRIPTION("Cirrus Logic JEDEC map driver");
 347 MODULE_LICENSE("GPL");