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
  54                         if (info->nr_parts)
  55                                 kfree(info->parts);
  56                 } else {
  57                         del_mtd_device(info->cmtd);
  58                 }
  59 #else
  60                 del_mtd_device(info->cmtd);
  61 #endif
  62                 if (info->cmtd != info->mtd[0])
  63                         mtd_concat_destroy(info->cmtd);
  64         }
  65
  66         for (i = 0; i < MAX_RESOURCES; i++) {
  67                 if (info->mtd[i] != NULL)
  68                         map_destroy(info->mtd[i]);
  69         }
  70
  71         if (physmap_data->exit)
  72                 physmap_data->exit(dev);
  73
  74         return 0;
  75 }
  76
  77 static void physmap_set_vpp(struct map_info *map, int state)
  78 {
  79         struct platform_device *pdev;
  80         struct physmap_flash_data *physmap_data;
  81
  82         pdev = (struct platform_device *)map->map_priv_1;
  83         physmap_data = pdev->dev.platform_data;
  84
  85         if (physmap_data->set_vpp)
  86                 physmap_data->set_vpp(pdev, state);
  87 }
  88
  89 static const char *rom_probe_types[] = {
  90                                         "cfi_probe",
  91                                         "jedec_probe",
  92                                         "qinfo_probe",
  93                                         "map_rom",
  94                                         NULL };
  95 #ifdef CONFIG_MTD_PARTITIONS
  96 static const char *part_probe_types[] = { "cmdlinepart", "RedBoot", "afs",
  97                                           NULL };
  98 #endif
  99
 100 static int physmap_flash_probe(struct platform_device *dev)
 101 {
 102         struct physmap_flash_data *physmap_data;
 103         struct physmap_flash_info *info;
 104         const char **probe_type;
 105         int err = 0;
 106         int i;
 107         int devices_found = 0;
 108
 109         physmap_data = dev->dev.platform_data;
 110         if (physmap_data == NULL)
 111                 return -ENODEV;
 112
 113         info = devm_kzalloc(&dev->dev, sizeof(struct physmap_flash_info),
 114                             GFP_KERNEL);
 115         if (info == NULL) {
 116                 err = -ENOMEM;
 117                 goto err_out;
 118         }
 119
 120         if (physmap_data->init) {
 121                 err = physmap_data->init(dev);
 122                 if (err)
 123                         goto err_out;
 124         }
 125
 126         platform_set_drvdata(dev, info);
 127
 128         for (i = 0; i < dev->num_resources; i++) {
 129                 printk(KERN_NOTICE "physmap platform flash device: %.8llx at %.8llx\n",
 130                        (unsigned long long)resource_size(&dev->resource[i]),
 131                        (unsigned long long)dev->resource[i].start);
 132
 133                 if (!devm_request_mem_region(&dev->dev,
 134                         dev->resource[i].start,
 135                         resource_size(&dev->resource[i]),
 136                         dev_name(&dev->dev))) {
 137                         dev_err(&dev->dev, "Could not reserve memory region\n");
 138                         err = -ENOMEM;
 139                         goto err_out;
 140                 }
 141
 142                 info->map[i].name = dev_name(&dev->dev);
 143                 info->map[i].phys = dev->resource[i].start;
 144                 info->map[i].size = resource_size(&dev->resource[i]);
 145                 info->map[i].bankwidth = physmap_data->width;
 146                 info->map[i].set_vpp = physmap_set_vpp;
 147                 info->map[i].pfow_base = physmap_data->pfow_base;
 148                 info->map[i].map_priv_1 = (unsigned long)dev;
 149
 150                 info->map[i].virt = devm_ioremap(&dev->dev, info->map[i].phys,
 151                                                  info->map[i].size);
 152                 if (info->map[i].virt == NULL) {
 153                         dev_err(&dev->dev, "Failed to ioremap flash region\n");
 154                         err = -EIO;
 155                         goto err_out;
 156                 }
 157
 158                 simple_map_init(&info->map[i]);
 159
 160                 probe_type = rom_probe_types;
 161                 if (physmap_data->probe_type == NULL) {
 162                         for (; info->mtd[i] == NULL && *probe_type != NULL; probe_type++)
 163                                 info->mtd[i] = do_map_probe(*probe_type, &info->map[i]);
 164                 } else
 165                         info->mtd[i] = do_map_probe(physmap_data->probe_type, &info->map[i]);
 166
 167                 if (info->mtd[i] == NULL) {
 168                         dev_err(&dev->dev, "map_probe failed\n");
 169                         err = -ENXIO;
 170                         goto err_out;
 171                 } else {
 172                         devices_found++;
 173                 }
 174                 info->mtd[i]->owner = THIS_MODULE;
 175                 info->mtd[i]->dev.parent = &dev->dev;
 176         }
 177
 178         if (devices_found == 1) {
 179                 info->cmtd = info->mtd[0];
 180         } else if (devices_found > 1) {
 181                 /*
 182                  * We detected multiple devices. Concatenate them together.
 183                  */
 184                 info->cmtd = mtd_concat_create(info->mtd, devices_found, dev_name(&dev->dev));
 185                 if (info->cmtd == NULL)
 186                         err = -ENXIO;
 187         }
 188         if (err)
 189                 goto err_out;
 190
 191 #ifdef CONFIG_MTD_PARTITIONS
 192         err = parse_mtd_partitions(info->cmtd, part_probe_types,
 193                                 &info->parts, 0);
 194         if (err > 0) {
 195                 add_mtd_partitions(info->cmtd, info->parts, err);
 196                 info->nr_parts = err;
 197                 return 0;
 198         }
 199
 200         if (physmap_data->nr_parts) {
 201                 printk(KERN_NOTICE "Using physmap partition information\n");
 202                 add_mtd_partitions(info->cmtd, physmap_data->parts,
 203                                    physmap_data->nr_parts);
 204                 return 0;
 205         }
 206 #endif
 207
 208         add_mtd_device(info->cmtd);
 209         return 0;
 210
 211 err_out:
 212         physmap_flash_remove(dev);
 213         return err;
 214 }
 215
 216 #ifdef CONFIG_PM
 217 static void physmap_flash_shutdown(struct platform_device *dev)
 218 {
 219         struct physmap_flash_info *info = platform_get_drvdata(dev);
 220         int i;
 221
 222         for (i = 0; i < MAX_RESOURCES && info->mtd[i]; i++)
 223                 if (info->mtd[i]->suspend && info->mtd[i]->resume)
 224                         if (info->mtd[i]->suspend(info->mtd[i]) == 0)
 225                                 info->mtd[i]->resume(info->mtd[i]);
 226 }
 227 #else
 228 #define physmap_flash_shutdown NULL
 229 #endif
 230
 231 static struct platform_driver physmap_flash_driver = {
 232         .probe          = physmap_flash_probe,
 233         .remove         = physmap_flash_remove,
 234         .shutdown       = physmap_flash_shutdown,
 235         .driver         = {
 236                 .name   = "physmap-flash",
 237                 .owner  = THIS_MODULE,
 238         },
 239 };
 240
 241
 242 #ifdef CONFIG_MTD_PHYSMAP_COMPAT
 243 static struct physmap_flash_data physmap_flash_data = {
 244         .width          = CONFIG_MTD_PHYSMAP_BANKWIDTH,
 245 };
 246
 247 static struct resource physmap_flash_resource = {
 248         .start          = CONFIG_MTD_PHYSMAP_START,
 249         .end            = CONFIG_MTD_PHYSMAP_START + CONFIG_MTD_PHYSMAP_LEN - 1,
 250         .flags          = IORESOURCE_MEM,
 251 };
 252
 253 static struct platform_device physmap_flash = {
 254         .name           = "physmap-flash",
 255         .id             = 0,
 256         .dev            = {
 257                 .platform_data  = &physmap_flash_data,
 258         },
 259         .num_resources  = 1,
 260         .resource       = &physmap_flash_resource,
 261 };
 262
 263 void physmap_configure(unsigned long addr, unsigned long size,
 264                 int bankwidth, void (*set_vpp)(struct map_info *, int))
 265 {
 266         physmap_flash_resource.start = addr;
 267         physmap_flash_resource.end = addr + size - 1;
 268         physmap_flash_data.width = bankwidth;
 269         physmap_flash_data.set_vpp = set_vpp;
 270 }
 271
 272 #ifdef CONFIG_MTD_PARTITIONS
 273 void physmap_set_partitions(struct mtd_partition *parts, int num_parts)
 274 {
 275         physmap_flash_data.nr_parts = num_parts;
 276         physmap_flash_data.parts = parts;
 277 }
 278 #endif
 279 #endif
 280
 281 static int __init physmap_init(void)
 282 {
 283         int err;
 284
 285         err = platform_driver_register(&physmap_flash_driver);
 286 #ifdef CONFIG_MTD_PHYSMAP_COMPAT
 287         if (err == 0) {
 288                 err = platform_device_register(&physmap_flash);
 289                 if (err)
 290                         platform_driver_unregister(&physmap_flash_driver);
 291         }
 292 #endif
 293
 294         return err;
 295 }
 296
 297 static void __exit physmap_exit(void)
 298 {
 299 #ifdef CONFIG_MTD_PHYSMAP_COMPAT
 300         platform_device_unregister(&physmap_flash);
 301 #endif
 302         platform_driver_unregister(&physmap_flash_driver);
 303 }
 304
 305 module_init(physmap_init);
 306 module_exit(physmap_exit);
 307
 308 MODULE_LICENSE("GPL");
 309 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
 310 MODULE_DESCRIPTION("Generic configurable MTD map driver");
 311
 312 /* legacy platform drivers can't hotplug or coldplg */
 313 #ifndef CONFIG_MTD_PHYSMAP_COMPAT
 314 /* work with hotplug and coldplug */
 315 MODULE_ALIAS("platform:physmap-flash");
 316 #endif