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   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
 207         return ret;
 208 }
 209
 210 static int physmap_flash_resume(struct platform_device *dev)
 211 {
 212         struct physmap_flash_info *info = platform_get_drvdata(dev);
 213         int i;
 214
 215         for (i = 0; i < MAX_RESOURCES && info->mtd[i]; i++)
 216                 if (info->mtd[i]->resume)
 217                         info->mtd[i]->resume(info->mtd[i]);
 218
 219         return 0;
 220 }
 221
 222 static void physmap_flash_shutdown(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]->suspend && info->mtd[i]->resume)
 229                         if (info->mtd[i]->suspend(info->mtd[i]) == 0)
 230                                 info->mtd[i]->resume(info->mtd[i]);
 231 }
 232 #else
 233 #define physmap_flash_suspend NULL
 234 #define physmap_flash_resume NULL
 235 #define physmap_flash_shutdown NULL
 236 #endif
 237
 238 static struct platform_driver physmap_flash_driver = {
 239         .probe          = physmap_flash_probe,
 240         .remove         = physmap_flash_remove,
 241         .suspend        = physmap_flash_suspend,
 242         .resume         = physmap_flash_resume,
 243         .shutdown       = physmap_flash_shutdown,
 244         .driver         = {
 245                 .name   = "physmap-flash",
 246                 .owner  = THIS_MODULE,
 247         },
 248 };
 249
 250
 251 #ifdef CONFIG_MTD_PHYSMAP_LEN
 252 #if CONFIG_MTD_PHYSMAP_LEN != 0
 253 #warning using PHYSMAP compat code
 254 #define PHYSMAP_COMPAT
 255 #endif
 256 #endif
 257
 258 #ifdef PHYSMAP_COMPAT
 259 static struct physmap_flash_data physmap_flash_data = {
 260         .width          = CONFIG_MTD_PHYSMAP_BANKWIDTH,
 261 };
 262
 263 static struct resource physmap_flash_resource = {
 264         .start          = CONFIG_MTD_PHYSMAP_START,
 265         .end            = CONFIG_MTD_PHYSMAP_START + CONFIG_MTD_PHYSMAP_LEN - 1,
 266         .flags          = IORESOURCE_MEM,
 267 };
 268
 269 static struct platform_device physmap_flash = {
 270         .name           = "physmap-flash",
 271         .id             = 0,
 272         .dev            = {
 273                 .platform_data  = &physmap_flash_data,
 274         },
 275         .num_resources  = 1,
 276         .resource       = &physmap_flash_resource,
 277 };
 278
 279 void physmap_configure(unsigned long addr, unsigned long size,
 280                 int bankwidth, void (*set_vpp)(struct map_info *, int))
 281 {
 282         physmap_flash_resource.start = addr;
 283         physmap_flash_resource.end = addr + size - 1;
 284         physmap_flash_data.width = bankwidth;
 285         physmap_flash_data.set_vpp = set_vpp;
 286 }
 287
 288 #ifdef CONFIG_MTD_PARTITIONS
 289 void physmap_set_partitions(struct mtd_partition *parts, int num_parts)
 290 {
 291         physmap_flash_data.nr_parts = num_parts;
 292         physmap_flash_data.parts = parts;
 293 }
 294 #endif
 295 #endif
 296
 297 static int __init physmap_init(void)
 298 {
 299         int err;
 300
 301         err = platform_driver_register(&physmap_flash_driver);
 302 #ifdef PHYSMAP_COMPAT
 303         if (err == 0)
 304                 platform_device_register(&physmap_flash);
 305 #endif
 306
 307         return err;
 308 }
 309
 310 static void __exit physmap_exit(void)
 311 {
 312 #ifdef PHYSMAP_COMPAT
 313         platform_device_unregister(&physmap_flash);
 314 #endif
 315         platform_driver_unregister(&physmap_flash_driver);
 316 }
 317
 318 module_init(physmap_init);
 319 module_exit(physmap_exit);
 320
 321 MODULE_LICENSE("GPL");
 322 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
 323 MODULE_DESCRIPTION("Generic configurable MTD map driver");
 324
 325 /* legacy platform drivers can't hotplug or coldplg */
 326 #ifndef PHYSMAP_COMPAT
 327 /* work with hotplug and coldplug */
 328 MODULE_ALIAS("platform:physmap-flash");
 329 #endif
 330