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