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

   1 /*======================================================================
   2
   3     drivers/mtd/maps/integrator-flash.c: ARM Integrator flash map driver
   4
   5     Copyright (C) 2000 ARM Limited
   6     Copyright (C) 2003 Deep Blue Solutions Ltd.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21
  22    This is access code for flashes using ARM's flash partitioning
  23    standards.
  24
  25 ======================================================================*/
  26
  27 #include <linux/module.h>
  28 #include <linux/types.h>
  29 #include <linux/kernel.h>
  30 #include <linux/slab.h>
  31 #include <linux/ioport.h>
  32 #include <linux/platform_device.h>
  33 #include <linux/init.h>
  34 #include <linux/io.h>
  35
  36 #include <linux/mtd/mtd.h>
  37 #include <linux/mtd/map.h>
  38 #include <linux/mtd/partitions.h>
  39 #include <linux/mtd/concat.h>
  40
  41 #include <asm/mach/flash.h>
  42 #include <mach/hardware.h>
  43 #include <asm/system.h>
  44
  45 struct armflash_subdev_info {
  46         char                    *name;
  47         struct mtd_info         *mtd;
  48         struct map_info         map;
  49         struct flash_platform_data *plat;
  50 };
  51
  52 struct armflash_info {
  53         struct resource         *res;
  54         struct mtd_partition    *parts;
  55         struct mtd_info         *mtd;
  56         int                     nr_subdev;
  57         struct armflash_subdev_info subdev[0];
  58 };
  59
  60 static void armflash_set_vpp(struct map_info *map, int on)
  61 {
  62         struct armflash_subdev_info *info =
  63                 container_of(map, struct armflash_subdev_info, map);
  64
  65         if (info->plat && info->plat->set_vpp)
  66                 info->plat->set_vpp(on);
  67 }
  68
  69 static const char *probes[] = { "cmdlinepart", "RedBoot", "afs", NULL };
  70
  71 static int armflash_subdev_probe(struct armflash_subdev_info *subdev,
  72                                  struct resource *res)
  73 {
  74         struct flash_platform_data *plat = subdev->plat;
  75         resource_size_t size = res->end - res->start + 1;
  76         void __iomem *base;
  77         int err = 0;
  78
  79         if (!request_mem_region(res->start, size, subdev->name)) {
  80                 err = -EBUSY;
  81                 goto out;
  82         }
  83
  84         base = ioremap(res->start, size);
  85         if (!base) {
  86                 err = -ENOMEM;
  87                 goto no_mem;
  88         }
  89
  90         /*
  91          * look for CFI based flash parts fitted to this board
  92          */
  93         subdev->map.size        = size;
  94         subdev->map.bankwidth   = plat->width;
  95         subdev->map.phys        = res->start;
  96         subdev->map.virt        = base;
  97         subdev->map.name        = subdev->name;
  98         subdev->map.set_vpp     = armflash_set_vpp;
  99
 100         simple_map_init(&subdev->map);
 101
 102         /*
 103          * Also, the CFI layer automatically works out what size
 104          * of chips we have, and does the necessary identification
 105          * for us automatically.
 106          */
 107         subdev->mtd = do_map_probe(plat->map_name, &subdev->map);
 108         if (!subdev->mtd) {
 109                 err = -ENXIO;
 110                 goto no_device;
 111         }
 112
 113         subdev->mtd->owner = THIS_MODULE;
 114
 115         /* Successful? */
 116         if (err == 0)
 117                 return err;
 118
 119         if (subdev->mtd)
 120                 map_destroy(subdev->mtd);
 121  no_device:
 122         iounmap(base);
 123  no_mem:
 124         release_mem_region(res->start, size);
 125  out:
 126         return err;
 127 }
 128
 129 static void armflash_subdev_remove(struct armflash_subdev_info *subdev)
 130 {
 131         if (subdev->mtd)
 132                 map_destroy(subdev->mtd);
 133         if (subdev->map.virt)
 134                 iounmap(subdev->map.virt);
 135         kfree(subdev->name);
 136         subdev->name = NULL;
 137         release_mem_region(subdev->map.phys, subdev->map.size);
 138 }
 139
 140 static int armflash_probe(struct platform_device *dev)
 141 {
 142         struct flash_platform_data *plat = dev->dev.platform_data;
 143         unsigned int size;
 144         struct armflash_info *info;
 145         int i, nr, err;
 146
 147         /* Count the number of devices */
 148         for (nr = 0; ; nr++)
 149                 if (!platform_get_resource(dev, IORESOURCE_MEM, nr))
 150                         break;
 151         if (nr == 0) {
 152                 err = -ENODEV;
 153                 goto out;
 154         }
 155
 156         size = sizeof(struct armflash_info) +
 157                 sizeof(struct armflash_subdev_info) * nr;
 158         info = kzalloc(size, GFP_KERNEL);
 159         if (!info) {
 160                 err = -ENOMEM;
 161                 goto out;
 162         }
 163
 164         if (plat && plat->init) {
 165                 err = plat->init();
 166                 if (err)
 167                         goto no_resource;
 168         }
 169
 170         for (i = 0; i < nr; i++) {
 171                 struct armflash_subdev_info *subdev = &info->subdev[i];
 172                 struct resource *res;
 173
 174                 res = platform_get_resource(dev, IORESOURCE_MEM, i);
 175                 if (!res)
 176                         break;
 177
 178                 if (nr == 1)
 179                         /* No MTD concatenation, just use the default name */
 180                         subdev->name = kstrdup(dev_name(&dev->dev), GFP_KERNEL);
 181                 else
 182                         subdev->name = kasprintf(GFP_KERNEL, "%s-%d",
 183                                                  dev_name(&dev->dev), i);
 184                 if (!subdev->name) {
 185                         err = -ENOMEM;
 186                         break;
 187                 }
 188                 subdev->plat = plat;
 189
 190                 err = armflash_subdev_probe(subdev, res);
 191                 if (err) {
 192                         kfree(subdev->name);
 193                         subdev->name = NULL;
 194                         break;
 195                 }
 196         }
 197         info->nr_subdev = i;
 198
 199         if (err)
 200                 goto subdev_err;
 201
 202         if (info->nr_subdev == 1)
 203                 info->mtd = info->subdev[0].mtd;
 204         else if (info->nr_subdev > 1) {
 205 #ifdef CONFIG_MTD_CONCAT
 206                 struct mtd_info *cdev[info->nr_subdev];
 207
 208                 /*
 209                  * We detected multiple devices.  Concatenate them together.
 210                  */
 211                 for (i = 0; i < info->nr_subdev; i++)
 212                         cdev[i] = info->subdev[i].mtd;
 213
 214                 info->mtd = mtd_concat_create(cdev, info->nr_subdev,
 215                                               dev_name(&dev->dev));
 216                 if (info->mtd == NULL)
 217                         err = -ENXIO;
 218 #else
 219                 printk(KERN_ERR "armflash: multiple devices found but "
 220                        "MTD concat support disabled.\n");
 221                 err = -ENXIO;
 222 #endif
 223         }
 224
 225         if (err < 0)
 226                 goto cleanup;
 227
 228         err = parse_mtd_partitions(info->mtd, probes, &info->parts, 0);
 229         if (err > 0) {
 230                 err = add_mtd_partitions(info->mtd, info->parts, err);
 231                 if (err)
 232                         printk(KERN_ERR
 233                                "mtd partition registration failed: %d\n", err);
 234         }
 235
 236         if (err == 0) {
 237                 platform_set_drvdata(dev, info);
 238                 return err;
 239         }
 240
 241         /*
 242          * We got an error, free all resources.
 243          */
 244  cleanup:
 245         if (info->mtd) {
 246                 del_mtd_partitions(info->mtd);
 247 #ifdef CONFIG_MTD_CONCAT
 248                 if (info->mtd != info->subdev[0].mtd)
 249                         mtd_concat_destroy(info->mtd);
 250 #endif
 251         }
 252         kfree(info->parts);
 253  subdev_err:
 254         for (i = info->nr_subdev - 1; i >= 0; i--)
 255                 armflash_subdev_remove(&info->subdev[i]);
 256  no_resource:
 257         if (plat && plat->exit)
 258                 plat->exit();
 259         kfree(info);
 260  out:
 261         return err;
 262 }
 263
 264 static int armflash_remove(struct platform_device *dev)
 265 {
 266         struct armflash_info *info = platform_get_drvdata(dev);
 267         struct flash_platform_data *plat = dev->dev.platform_data;
 268         int i;
 269
 270         platform_set_drvdata(dev, NULL);
 271
 272         if (info) {
 273                 if (info->mtd) {
 274                         del_mtd_partitions(info->mtd);
 275 #ifdef CONFIG_MTD_CONCAT
 276                         if (info->mtd != info->subdev[0].mtd)
 277                                 mtd_concat_destroy(info->mtd);
 278 #endif
 279                 }
 280                 kfree(info->parts);
 281
 282                 for (i = info->nr_subdev - 1; i >= 0; i--)
 283                         armflash_subdev_remove(&info->subdev[i]);
 284
 285                 if (plat && plat->exit)
 286                         plat->exit();
 287
 288                 kfree(info);
 289         }
 290
 291         return 0;
 292 }
 293
 294 static struct platform_driver armflash_driver = {
 295         .probe          = armflash_probe,
 296         .remove         = armflash_remove,
 297         .driver         = {
 298                 .name   = "armflash",
 299                 .owner  = THIS_MODULE,
 300         },
 301 };
 302
 303 static int __init armflash_init(void)
 304 {
 305         return platform_driver_register(&armflash_driver);
 306 }
 307
 308 static void __exit armflash_exit(void)
 309 {
 310         platform_driver_unregister(&armflash_driver);
 311 }
 312
 313 module_init(armflash_init);
 314 module_exit(armflash_exit);
 315
 316 MODULE_AUTHOR("ARM Ltd");
 317 MODULE_DESCRIPTION("ARM Integrator CFI map driver");
 318 MODULE_LICENSE("GPL");
 319 MODULE_ALIAS("platform:armflash");