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