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