release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/mtd/maps/sa1100-flash.c

   1 /*
   2  * Flash memory access on SA11x0 based devices
   3  *
   4  * (C) 2000 Nicolas Pitre <nico@fluxnic.net>
   5  */
   6 #include <linux/module.h>
   7 #include <linux/types.h>
   8 #include <linux/ioport.h>
   9 #include <linux/kernel.h>
  10 #include <linux/init.h>
  11 #include <linux/errno.h>
  12 #include <linux/slab.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/err.h>
  15 #include <linux/io.h>
  16
  17 #include <linux/mtd/mtd.h>
  18 #include <linux/mtd/map.h>
  19 #include <linux/mtd/partitions.h>
  20 #include <linux/mtd/concat.h>
  21
  22 #include <mach/hardware.h>
  23 #include <asm/sizes.h>
  24 #include <asm/mach/flash.h>
  25
  26
  27 struct sa_subdev_info {
  28         char name[16];
  29         struct map_info map;
  30         struct mtd_info *mtd;
  31         struct flash_platform_data *plat;
  32 };
  33
  34 struct sa_info {
  35         struct mtd_partition    *parts;
  36         struct mtd_info         *mtd;
  37         int                     num_subdev;
  38         unsigned int            nr_parts;
  39         struct sa_subdev_info   subdev[0];
  40 };
  41
  42 static void sa1100_set_vpp(struct map_info *map, int on)
  43 {
  44         struct sa_subdev_info *subdev = container_of(map, struct sa_subdev_info, map);
  45         subdev->plat->set_vpp(on);
  46 }
  47
  48 static void sa1100_destroy_subdev(struct sa_subdev_info *subdev)
  49 {
  50         if (subdev->mtd)
  51                 map_destroy(subdev->mtd);
  52         if (subdev->map.virt)
  53                 iounmap(subdev->map.virt);
  54         release_mem_region(subdev->map.phys, subdev->map.size);
  55 }
  56
  57 static int sa1100_probe_subdev(struct sa_subdev_info *subdev, struct resource *res)
  58 {
  59         unsigned long phys;
  60         unsigned int size;
  61         int ret;
  62
  63         phys = res->start;
  64         size = res->end - phys + 1;
  65
  66         /*
  67          * Retrieve the bankwidth from the MSC registers.
  68          * We currently only implement CS0 and CS1 here.
  69          */
  70         switch (phys) {
  71         default:
  72                 printk(KERN_WARNING "SA1100 flash: unknown base address "
  73                        "0x%08lx, assuming CS0\n", phys);
  74
  75         case SA1100_CS0_PHYS:
  76                 subdev->map.bankwidth = (MSC0 & MSC_RBW) ? 2 : 4;
  77                 break;
  78
  79         case SA1100_CS1_PHYS:
  80                 subdev->map.bankwidth = ((MSC0 >> 16) & MSC_RBW) ? 2 : 4;
  81                 break;
  82         }
  83
  84         if (!request_mem_region(phys, size, subdev->name)) {
  85                 ret = -EBUSY;
  86                 goto out;
  87         }
  88
  89         if (subdev->plat->set_vpp)
  90                 subdev->map.set_vpp = sa1100_set_vpp;
  91
  92         subdev->map.phys = phys;
  93         subdev->map.size = size;
  94         subdev->map.virt = ioremap(phys, size);
  95         if (!subdev->map.virt) {
  96                 ret = -ENOMEM;
  97                 goto err;
  98         }
  99
 100         simple_map_init(&subdev->map);
 101
 102         /*
 103          * Now let's probe for the actual flash.  Do it here since
 104          * specific machine settings might have been set above.
 105          */
 106         subdev->mtd = do_map_probe(subdev->plat->map_name, &subdev->map);
 107         if (subdev->mtd == NULL) {
 108                 ret = -ENXIO;
 109                 goto err;
 110         }
 111         subdev->mtd->owner = THIS_MODULE;
 112
 113         printk(KERN_INFO "SA1100 flash: CFI device at 0x%08lx, %uMiB, %d-bit\n",
 114                 phys, (unsigned)(subdev->mtd->size >> 20),
 115                 subdev->map.bankwidth * 8);
 116
 117         return 0;
 118
 119  err:
 120         sa1100_destroy_subdev(subdev);
 121  out:
 122         return ret;
 123 }
 124
 125 static void sa1100_destroy(struct sa_info *info, struct flash_platform_data *plat)
 126 {
 127         int i;
 128
 129         if (info->mtd) {
 130                 if (info->nr_parts == 0)
 131                         del_mtd_device(info->mtd);
 132 #ifdef CONFIG_MTD_PARTITIONS
 133                 else
 134                         del_mtd_partitions(info->mtd);
 135 #endif
 136 #ifdef CONFIG_MTD_CONCAT
 137                 if (info->mtd != info->subdev[0].mtd)
 138                         mtd_concat_destroy(info->mtd);
 139 #endif
 140         }
 141
 142         kfree(info->parts);
 143
 144         for (i = info->num_subdev - 1; i >= 0; i--)
 145                 sa1100_destroy_subdev(&info->subdev[i]);
 146         kfree(info);
 147
 148         if (plat->exit)
 149                 plat->exit();
 150 }
 151
 152 static struct sa_info *__devinit
 153 sa1100_setup_mtd(struct platform_device *pdev, struct flash_platform_data *plat)
 154 {
 155         struct sa_info *info;
 156         int nr, size, i, ret = 0;
 157
 158         /*
 159          * Count number of devices.
 160          */
 161         for (nr = 0; ; nr++)
 162                 if (!platform_get_resource(pdev, IORESOURCE_MEM, nr))
 163                         break;
 164
 165         if (nr == 0) {
 166                 ret = -ENODEV;
 167                 goto out;
 168         }
 169
 170         size = sizeof(struct sa_info) + sizeof(struct sa_subdev_info) * nr;
 171
 172         /*
 173          * Allocate the map_info structs in one go.
 174          */
 175         info = kzalloc(size, GFP_KERNEL);
 176         if (!info) {
 177                 ret = -ENOMEM;
 178                 goto out;
 179         }
 180
 181         if (plat->init) {
 182                 ret = plat->init();
 183                 if (ret)
 184                         goto err;
 185         }
 186
 187         /*
 188          * Claim and then map the memory regions.
 189          */
 190         for (i = 0; i < nr; i++) {
 191                 struct sa_subdev_info *subdev = &info->subdev[i];
 192                 struct resource *res;
 193
 194                 res = platform_get_resource(pdev, IORESOURCE_MEM, i);
 195                 if (!res)
 196                         break;
 197
 198                 subdev->map.name = subdev->name;
 199                 sprintf(subdev->name, "%s-%d", plat->name, i);
 200                 subdev->plat = plat;
 201
 202                 ret = sa1100_probe_subdev(subdev, res);
 203                 if (ret)
 204                         break;
 205         }
 206
 207         info->num_subdev = i;
 208
 209         /*
 210          * ENXIO is special.  It means we didn't find a chip when we probed.
 211          */
 212         if (ret != 0 && !(ret == -ENXIO && info->num_subdev > 0))
 213                 goto err;
 214
 215         /*
 216          * If we found one device, don't bother with concat support.  If
 217          * we found multiple devices, use concat if we have it available,
 218          * otherwise fail.  Either way, it'll be called "sa1100".
 219          */
 220         if (info->num_subdev == 1) {
 221                 strcpy(info->subdev[0].name, plat->name);
 222                 info->mtd = info->subdev[0].mtd;
 223                 ret = 0;
 224         } else if (info->num_subdev > 1) {
 225 #ifdef CONFIG_MTD_CONCAT
 226                 struct mtd_info *cdev[nr];
 227                 /*
 228                  * We detected multiple devices.  Concatenate them together.
 229                  */
 230                 for (i = 0; i < info->num_subdev; i++)
 231                         cdev[i] = info->subdev[i].mtd;
 232
 233                 info->mtd = mtd_concat_create(cdev, info->num_subdev,
 234                                               plat->name);
 235                 if (info->mtd == NULL)
 236                         ret = -ENXIO;
 237 #else
 238                 printk(KERN_ERR "SA1100 flash: multiple devices "
 239                        "found but MTD concat support disabled.\n");
 240                 ret = -ENXIO;
 241 #endif
 242         }
 243
 244         if (ret == 0)
 245                 return info;
 246
 247  err:
 248         sa1100_destroy(info, plat);
 249  out:
 250         return ERR_PTR(ret);
 251 }
 252
 253 static const char *part_probes[] = { "cmdlinepart", "RedBoot", NULL };
 254
 255 static int __devinit sa1100_mtd_probe(struct platform_device *pdev)
 256 {
 257         struct flash_platform_data *plat = pdev->dev.platform_data;
 258         struct mtd_partition *parts;
 259         const char *part_type = NULL;
 260         struct sa_info *info;
 261         int err, nr_parts = 0;
 262
 263         if (!plat)
 264                 return -ENODEV;
 265
 266         info = sa1100_setup_mtd(pdev, plat);
 267         if (IS_ERR(info)) {
 268                 err = PTR_ERR(info);
 269                 goto out;
 270         }
 271
 272         /*
 273          * Partition selection stuff.
 274          */
 275 #ifdef CONFIG_MTD_PARTITIONS
 276         nr_parts = parse_mtd_partitions(info->mtd, part_probes, &parts, 0);
 277         if (nr_parts > 0) {
 278                 info->parts = parts;
 279                 part_type = "dynamic";
 280         } else
 281 #endif
 282         {
 283                 parts = plat->parts;
 284                 nr_parts = plat->nr_parts;
 285                 part_type = "static";
 286         }
 287
 288         if (nr_parts == 0) {
 289                 printk(KERN_NOTICE "SA1100 flash: no partition info "
 290                         "available, registering whole flash\n");
 291                 add_mtd_device(info->mtd);
 292         } else {
 293                 printk(KERN_NOTICE "SA1100 flash: using %s partition "
 294                         "definition\n", part_type);
 295                 add_mtd_partitions(info->mtd, parts, nr_parts);
 296         }
 297
 298         info->nr_parts = nr_parts;
 299
 300         platform_set_drvdata(pdev, info);
 301         err = 0;
 302
 303  out:
 304         return err;
 305 }
 306
 307 static int __exit sa1100_mtd_remove(struct platform_device *pdev)
 308 {
 309         struct sa_info *info = platform_get_drvdata(pdev);
 310         struct flash_platform_data *plat = pdev->dev.platform_data;
 311
 312         platform_set_drvdata(pdev, NULL);
 313         sa1100_destroy(info, plat);
 314
 315         return 0;
 316 }
 317
 318 #ifdef CONFIG_PM
 319 static void sa1100_mtd_shutdown(struct platform_device *dev)
 320 {
 321         struct sa_info *info = platform_get_drvdata(dev);
 322         if (info && info->mtd->suspend(info->mtd) == 0)
 323                 info->mtd->resume(info->mtd);
 324 }
 325 #else
 326 #define sa1100_mtd_shutdown NULL
 327 #endif
 328
 329 static struct platform_driver sa1100_mtd_driver = {
 330         .probe          = sa1100_mtd_probe,
 331         .remove         = __exit_p(sa1100_mtd_remove),
 332         .shutdown       = sa1100_mtd_shutdown,
 333         .driver         = {
 334                 .name   = "sa1100-mtd",
 335                 .owner  = THIS_MODULE,
 336         },
 337 };
 338
 339 static int __init sa1100_mtd_init(void)
 340 {
 341         return platform_driver_register(&sa1100_mtd_driver);
 342 }
 343
 344 static void __exit sa1100_mtd_exit(void)
 345 {
 346         platform_driver_unregister(&sa1100_mtd_driver);
 347 }
 348
 349 module_init(sa1100_mtd_init);
 350 module_exit(sa1100_mtd_exit);
 351
 352 MODULE_AUTHOR("Nicolas Pitre");
 353 MODULE_DESCRIPTION("SA1100 CFI map driver");
 354 MODULE_LICENSE("GPL");
 355 MODULE_ALIAS("platform:sa1100-mtd");