drivers/mtd/maps/physmap.c

   1 /*
   2  * Normal mappings of chips in physical memory
   3  *
   4  * Copyright (C) 2003 MontaVista Software Inc.
   5  * Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
   6  *
   7  * 031022 - [jsun] add run-time configure and partition setup
   8  */
   9
  10 #include <linux/module.h>
  11 #include <linux/types.h>
  12 #include <linux/kernel.h>
  13 #include <linux/init.h>
  14 #include <linux/slab.h>
  15 #include <linux/device.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/mtd/mtd.h>
  18 #include <linux/mtd/map.h>
  19 #include <linux/mtd/partitions.h>
  20 #include <linux/mtd/physmap.h>
  21 #include <linux/mtd/concat.h>
  22 #include <asm/io.h>
  23
  24 #define MAX_RESOURCES           4
  25
  26 struct physmap_flash_info {
  27         struct mtd_info         *mtd[MAX_RESOURCES];
  28         struct mtd_info         *cmtd;
  29         struct map_info         map[MAX_RESOURCES];
  30         struct resource         *res;
  31 #ifdef CONFIG_MTD_PARTITIONS
  32         int                     nr_parts;
  33         struct mtd_partition    *parts;
  34 #endif
  35 };
  36
  37 static int physmap_flash_remove(struct platform_device *dev)
  38 {
  39         struct physmap_flash_info *info;
  40         struct physmap_flash_data *physmap_data;
  41         int i;
  42
  43         info = platform_get_drvdata(dev);
  44         if (info == NULL)
  45                 return 0;
  46         platform_set_drvdata(dev, NULL);
  47
  48         physmap_data = dev->dev.platform_data;
  49
  50 #ifdef CONFIG_MTD_CONCAT
  51         if (info->cmtd != info->mtd[0]) {
  52                 del_mtd_device(info->cmtd);
  53                 mtd_concat_destroy(info->cmtd);
  54         }
  55 #endif
  56
  57         for (i = 0; i < MAX_RESOURCES; i++) {
  58                 if (info->mtd[i] != NULL) {
  59 #ifdef CONFIG_MTD_PARTITIONS
  60                         if (info->nr_parts) {
  61                                 del_mtd_partitions(info->mtd[i]);
  62                                 kfree(info->parts);
  63                         } else if (physmap_data->nr_parts) {
  64                                 del_mtd_partitions(info->mtd[i]);
  65                         } else {
  66                                 del_mtd_device(info->mtd[i]);
  67                         }
  68 #else
  69                         del_mtd_device(info->mtd[i]);
  70 #endif
  71                         map_destroy(info->mtd[i]);
  72                 }
  73
  74                 if (info->map[i].virt != NULL)
  75                         iounmap(info->map[i].virt);
  76         }
  77
  78         if (info->res != NULL) {
  79                 release_resource(info->res);
  80                 kfree(info->res);
  81         }
  82
  83         return 0;
  84 }
  85
  86 static const char *rom_probe_types[] = { "cfi_probe", "jedec_probe", "map_rom", NULL };
  87 #ifdef CONFIG_MTD_PARTITIONS
  88 static const char *part_probe_types[] = { "cmdlinepart", "RedBoot", NULL };
  89 #endif
  90
  91 static int physmap_flash_probe(struct platform_device *dev)
  92 {
  93         struct physmap_flash_data *physmap_data;
  94         struct physmap_flash_info *info;
  95         const char **probe_type;
  96         int err = 0;
  97         int i;
  98         int devices_found = 0;
  99
 100         physmap_data = dev->dev.platform_data;
 101         if (physmap_data == NULL)
 102                 return -ENODEV;
 103
 104         info = kzalloc(sizeof(struct physmap_flash_info), GFP_KERNEL);
 105         if (info == NULL) {
 106                 err = -ENOMEM;
 107                 goto err_out;
 108         }
 109
 110         platform_set_drvdata(dev, info);
 111
 112         for (i = 0; i < dev->num_resources; i++) {
 113                 printk(KERN_NOTICE "physmap platform flash device: %.8llx at %.8llx\n",
 114                        (unsigned long long)(dev->resource[i].end - dev->resource[i].start + 1),
 115                        (unsigned long long)dev->resource[i].start);
 116
 117                 info->res = request_mem_region(dev->resource[i].start,
 118                                                dev->resource[i].end - dev->resource[i].start + 1,
 119                                                dev->dev.bus_id);
 120                 if (info->res == NULL) {
 121                         dev_err(&dev->dev, "Could not reserve memory region\n");
 122                         err = -ENOMEM;
 123                         goto err_out;
 124                 }
 125
 126                 info->map[i].name = dev->dev.bus_id;
 127                 info->map[i].phys = dev->resource[i].start;
 128                 info->map[i].size = dev->resource[i].end - dev->resource[i].start + 1;
 129                 info->map[i].bankwidth = physmap_data->width;
 130                 info->map[i].set_vpp = physmap_data->set_vpp;
 131
 132                 info->map[i].virt = ioremap(info->map[i].phys, info->map[i].size);
 133                 if (info->map[i].virt == NULL) {
 134                         dev_err(&dev->dev, "Failed to ioremap flash region\n");
 135                         err = EIO;
 136                         goto err_out;
 137                 }
 138
 139                 simple_map_init(&info->map[i]);
 140
 141                 probe_type = rom_probe_types;
 142                 for (; info->mtd[i] == NULL && *probe_type != NULL; probe_type++)
 143                         info->mtd[i] = do_map_probe(*probe_type, &info->map[i]);
 144                 if (info->mtd[i] == NULL) {
 145                         dev_err(&dev->dev, "map_probe failed\n");
 146                         err = -ENXIO;
 147                         goto err_out;
 148                 } else {
 149                         devices_found++;
 150                 }
 151                 info->mtd[i]->owner = THIS_MODULE;
 152         }
 153
 154         if (devices_found == 1) {
 155                 info->cmtd = info->mtd[0];
 156         } else if (devices_found > 1) {
 157                 /*
 158                  * We detected multiple devices. Concatenate them together.
 159                  */
 160 #ifdef CONFIG_MTD_CONCAT
 161                 info->cmtd = mtd_concat_create(info->mtd, devices_found, dev->dev.bus_id);
 162                 if (info->cmtd == NULL)
 163                         err = -ENXIO;
 164 #else
 165                 printk(KERN_ERR "physmap-flash: multiple devices "
 166                        "found but MTD concat support disabled.\n");
 167                 err = -ENXIO;
 168 #endif
 169         }
 170         if (err)
 171                 goto err_out;
 172
 173 #ifdef CONFIG_MTD_PARTITIONS
 174         err = parse_mtd_partitions(info->cmtd, part_probe_types, &info->parts, 0);
 175         if (err > 0) {
 176                 add_mtd_partitions(info->cmtd, info->parts, err);
 177                 return 0;
 178         }
 179
 180         if (physmap_data->nr_parts) {
 181                 printk(KERN_NOTICE "Using physmap partition information\n");
 182                 add_mtd_partitions(info->cmtd, physmap_data->parts,
 183                                    physmap_data->nr_parts);
 184                 return 0;
 185         }
 186 #endif
 187
 188         add_mtd_device(info->cmtd);
 189         return 0;
 190
 191 err_out:
 192         physmap_flash_remove(dev);
 193         return err;
 194 }
 195
 196 #ifdef CONFIG_PM
 197 static int physmap_flash_suspend(struct platform_device *dev, pm_message_t state)
 198 {
 199         struct physmap_flash_info *info = platform_get_drvdata(dev);
 200         int ret = 0;
 201         int i;
 202
 203         for (i = 0; i < MAX_RESOURCES && info->mtd[i]; i++)
 204                 if (info->mtd[i]->suspend) {
 205                         ret = info->mtd[i]->suspend(info->mtd[i]);
 206                         if (ret)
 207                                 goto fail;
 208                 }
 209
 210         return 0;
 211 fail:
 212         for (--i; i >= 0; --i)
 213                 if (info->mtd[i]->suspend) {
 214                         BUG_ON(!info->mtd[i]->resume);
 215                         info->mtd[i]->resume(info->mtd[i]);
 216                 }
 217
 218         return ret;
 219 }
 220
 221 static int physmap_flash_resume(struct platform_device *dev)
 222 {
 223         struct physmap_flash_info *info = platform_get_drvdata(dev);
 224         int i;
 225
 226         for (i = 0; i < MAX_RESOURCES && info->mtd[i]; i++)
 227                 if (info->mtd[i]->resume)
 228                         info->mtd[i]->resume(info->mtd[i]);
 229
 230         return 0;
 231 }
 232
 233 static void physmap_flash_shutdown(struct platform_device *dev)
 234 {
 235         struct physmap_flash_info *info = platform_get_drvdata(dev);
 236         int i;
 237
 238         for (i = 0; i < MAX_RESOURCES && info->mtd[i]; i++)
 239                 if (info->mtd[i]->suspend && info->mtd[i]->resume)
 240                         if (info->mtd[i]->suspend(info->mtd[i]) == 0)
 241                                 info->mtd[i]->resume(info->mtd[i]);
 242 }
 243 #else
 244 #define physmap_flash_suspend NULL
 245 #define physmap_flash_resume NULL
 246 #define physmap_flash_shutdown NULL
 247 #endif
 248
 249 static struct platform_driver physmap_flash_driver = {
 250         .probe          = physmap_flash_probe,
 251         .remove         = physmap_flash_remove,
 252         .suspend        = physmap_flash_suspend,
 253         .resume         = physmap_flash_resume,
 254         .shutdown       = physmap_flash_shutdown,
 255         .driver         = {
 256                 .name   = "physmap-flash",
 257                 .owner  = THIS_MODULE,
 258         },
 259 };
 260
 261
 262 #ifdef CONFIG_MTD_PHYSMAP_LEN
 263 #if CONFIG_MTD_PHYSMAP_LEN != 0
 264 #warning using PHYSMAP compat code
 265 #define PHYSMAP_COMPAT
 266 #endif
 267 #endif
 268
 269 #ifdef PHYSMAP_COMPAT
 270 static struct physmap_flash_data physmap_flash_data = {
 271         .width          = CONFIG_MTD_PHYSMAP_BANKWIDTH,
 272 };
 273
 274 static struct resource physmap_flash_resource = {
 275         .start          = CONFIG_MTD_PHYSMAP_START,
 276         .end            = CONFIG_MTD_PHYSMAP_START + CONFIG_MTD_PHYSMAP_LEN - 1,
 277         .flags          = IORESOURCE_MEM,
 278 };
 279
 280 static struct platform_device physmap_flash = {
 281         .name           = "physmap-flash",
 282         .id             = 0,
 283         .dev            = {
 284                 .platform_data  = &physmap_flash_data,
 285         },
 286         .num_resources  = 1,
 287         .resource       = &physmap_flash_resource,
 288 };
 289
 290 void physmap_configure(unsigned long addr, unsigned long size,
 291                 int bankwidth, void (*set_vpp)(struct map_info *, int))
 292 {
 293         physmap_flash_resource.start = addr;
 294         physmap_flash_resource.end = addr + size - 1;
 295         physmap_flash_data.width = bankwidth;
 296         physmap_flash_data.set_vpp = set_vpp;
 297 }
 298
 299 #ifdef CONFIG_MTD_PARTITIONS
 300 void physmap_set_partitions(struct mtd_partition *parts, int num_parts)
 301 {
 302         physmap_flash_data.nr_parts = num_parts;
 303         physmap_flash_data.parts = parts;
 304 }
 305 #endif
 306 #endif
 307
 308 static int __init physmap_init(void)
 309 {
 310         int err;
 311
 312         err = platform_driver_register(&physmap_flash_driver);
 313 #ifdef PHYSMAP_COMPAT
 314         if (err == 0)
 315                 platform_device_register(&physmap_flash);
 316 #endif
 317
 318         return err;
 319 }
 320
 321 static void __exit physmap_exit(void)
 322 {
 323 #ifdef PHYSMAP_COMPAT
 324         platform_device_unregister(&physmap_flash);
 325 #endif
 326         platform_driver_unregister(&physmap_flash_driver);
 327 }
 328
 329 module_init(physmap_init);
 330 module_exit(physmap_exit);
 331
 332 MODULE_LICENSE("GPL");
 333 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
 334 MODULE_DESCRIPTION("Generic configurable MTD map driver");
 335
 336 /* legacy platform drivers can't hotplug or coldplg */
 337 #ifndef PHYSMAP_COMPAT
 338 /* work with hotplug and coldplug */
 339 MODULE_ALIAS("platform:physmap-flash");
 340 #endif
 341