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