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