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         int                     nr_parts;
  31         struct mtd_partition    *parts;
  32 };
  33
  34 static int physmap_flash_remove(struct platform_device *dev)
  35 {
  36         struct physmap_flash_info *info;
  37         struct physmap_flash_data *physmap_data;
  38         int i;
  39
  40         info = platform_get_drvdata(dev);
  41         if (info == NULL)
  42                 return 0;
  43         platform_set_drvdata(dev, NULL);
  44
  45         physmap_data = dev->dev.platform_data;
  46
  47         if (info->cmtd) {
  48                 mtd_device_unregister(info->cmtd);
  49                 if (info->nr_parts)
  50                         kfree(info->parts);
  51                 if (info->cmtd != info->mtd[0])
  52                         mtd_concat_destroy(info->cmtd);
  53         }
  54
  55         for (i = 0; i < MAX_RESOURCES; i++) {
  56                 if (info->mtd[i] != NULL)
  57                         map_destroy(info->mtd[i]);
  58         }
  59
  60         if (physmap_data->exit)
  61                 physmap_data->exit(dev);
  62
  63         return 0;
  64 }
  65
  66 static void physmap_set_vpp(struct map_info *map, int state)
  67 {
  68         struct platform_device *pdev;
  69         struct physmap_flash_data *physmap_data;
  70
  71         pdev = (struct platform_device *)map->map_priv_1;
  72         physmap_data = pdev->dev.platform_data;
  73
  74         if (physmap_data->set_vpp)
  75                 physmap_data->set_vpp(pdev, state);
  76 }
  77
  78 static const char *rom_probe_types[] = {
  79                                         "cfi_probe",
  80                                         "jedec_probe",
  81                                         "qinfo_probe",
  82                                         "map_rom",
  83                                         NULL };
  84 static const char *part_probe_types[] = { "cmdlinepart", "RedBoot", "afs",
  85                                           NULL };
  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         if (physmap_data->init) {
 108                 err = physmap_data->init(dev);
 109                 if (err)
 110                         goto err_out;
 111         }
 112
 113         platform_set_drvdata(dev, info);
 114
 115         for (i = 0; i < dev->num_resources; i++) {
 116                 printk(KERN_NOTICE "physmap platform flash device: %.8llx at %.8llx\n",
 117                        (unsigned long long)resource_size(&dev->resource[i]),
 118                        (unsigned long long)dev->resource[i].start);
 119
 120                 if (!devm_request_mem_region(&dev->dev,
 121                         dev->resource[i].start,
 122                         resource_size(&dev->resource[i]),
 123                         dev_name(&dev->dev))) {
 124                         dev_err(&dev->dev, "Could not reserve memory region\n");
 125                         err = -ENOMEM;
 126                         goto err_out;
 127                 }
 128
 129                 info->map[i].name = dev_name(&dev->dev);
 130                 info->map[i].phys = dev->resource[i].start;
 131                 info->map[i].size = resource_size(&dev->resource[i]);
 132                 info->map[i].bankwidth = physmap_data->width;
 133                 info->map[i].set_vpp = physmap_set_vpp;
 134                 info->map[i].pfow_base = physmap_data->pfow_base;
 135                 info->map[i].map_priv_1 = (unsigned long)dev;
 136
 137                 info->map[i].virt = devm_ioremap(&dev->dev, info->map[i].phys,
 138                                                  info->map[i].size);
 139                 if (info->map[i].virt == NULL) {
 140                         dev_err(&dev->dev, "Failed to ioremap flash region\n");
 141                         err = -EIO;
 142                         goto err_out;
 143                 }
 144
 145                 simple_map_init(&info->map[i]);
 146
 147                 probe_type = rom_probe_types;
 148                 if (physmap_data->probe_type == NULL) {
 149                         for (; info->mtd[i] == NULL && *probe_type != NULL; probe_type++)
 150                                 info->mtd[i] = do_map_probe(*probe_type, &info->map[i]);
 151                 } else
 152                         info->mtd[i] = do_map_probe(physmap_data->probe_type, &info->map[i]);
 153
 154                 if (info->mtd[i] == NULL) {
 155                         dev_err(&dev->dev, "map_probe failed\n");
 156                         err = -ENXIO;
 157                         goto err_out;
 158                 } else {
 159                         devices_found++;
 160                 }
 161                 info->mtd[i]->owner = THIS_MODULE;
 162                 info->mtd[i]->dev.parent = &dev->dev;
 163         }
 164
 165         if (devices_found == 1) {
 166                 info->cmtd = info->mtd[0];
 167         } else if (devices_found > 1) {
 168                 /*
 169                  * We detected multiple devices. Concatenate them together.
 170                  */
 171                 info->cmtd = mtd_concat_create(info->mtd, devices_found, dev_name(&dev->dev));
 172                 if (info->cmtd == NULL)
 173                         err = -ENXIO;
 174         }
 175         if (err)
 176                 goto err_out;
 177
 178         err = parse_mtd_partitions(info->cmtd, part_probe_types,
 179                                    &info->parts, 0);
 180         if (err > 0) {
 181                 mtd_device_register(info->cmtd, info->parts, err);
 182                 info->nr_parts = err;
 183                 return 0;
 184         }
 185
 186         if (physmap_data->nr_parts) {
 187                 printk(KERN_NOTICE "Using physmap partition information\n");
 188                 mtd_device_register(info->cmtd, physmap_data->parts,
 189                                     physmap_data->nr_parts);
 190                 return 0;
 191         }
 192
 193         mtd_device_register(info->cmtd, NULL, 0);
 194
 195         return 0;
 196
 197 err_out:
 198         physmap_flash_remove(dev);
 199         return err;
 200 }
 201
 202 #ifdef CONFIG_PM
 203 static void physmap_flash_shutdown(struct platform_device *dev)
 204 {
 205         struct physmap_flash_info *info = platform_get_drvdata(dev);
 206         int i;
 207
 208         for (i = 0; i < MAX_RESOURCES && info->mtd[i]; i++)
 209                 if (info->mtd[i]->suspend && info->mtd[i]->resume)
 210                         if (info->mtd[i]->suspend(info->mtd[i]) == 0)
 211                                 info->mtd[i]->resume(info->mtd[i]);
 212 }
 213 #else
 214 #define physmap_flash_shutdown NULL
 215 #endif
 216
 217 static struct platform_driver physmap_flash_driver = {
 218         .probe          = physmap_flash_probe,
 219         .remove         = physmap_flash_remove,
 220         .shutdown       = physmap_flash_shutdown,
 221         .driver         = {
 222                 .name   = "physmap-flash",
 223                 .owner  = THIS_MODULE,
 224         },
 225 };
 226
 227
 228 #ifdef CONFIG_MTD_PHYSMAP_COMPAT
 229 static struct physmap_flash_data physmap_flash_data = {
 230         .width          = CONFIG_MTD_PHYSMAP_BANKWIDTH,
 231 };
 232
 233 static struct resource physmap_flash_resource = {
 234         .start          = CONFIG_MTD_PHYSMAP_START,
 235         .end            = CONFIG_MTD_PHYSMAP_START + CONFIG_MTD_PHYSMAP_LEN - 1,
 236         .flags          = IORESOURCE_MEM,
 237 };
 238
 239 static struct platform_device physmap_flash = {
 240         .name           = "physmap-flash",
 241         .id             = 0,
 242         .dev            = {
 243                 .platform_data  = &physmap_flash_data,
 244         },
 245         .num_resources  = 1,
 246         .resource       = &physmap_flash_resource,
 247 };
 248
 249 void physmap_configure(unsigned long addr, unsigned long size,
 250                 int bankwidth, void (*set_vpp)(struct map_info *, int))
 251 {
 252         physmap_flash_resource.start = addr;
 253         physmap_flash_resource.end = addr + size - 1;
 254         physmap_flash_data.width = bankwidth;
 255         physmap_flash_data.set_vpp = set_vpp;
 256 }
 257
 258 void physmap_set_partitions(struct mtd_partition *parts, int num_parts)
 259 {
 260         physmap_flash_data.nr_parts = num_parts;
 261         physmap_flash_data.parts = parts;
 262 }
 263 #endif
 264
 265 static int __init physmap_init(void)
 266 {
 267         int err;
 268
 269         err = platform_driver_register(&physmap_flash_driver);
 270 #ifdef CONFIG_MTD_PHYSMAP_COMPAT
 271         if (err == 0) {
 272                 err = platform_device_register(&physmap_flash);
 273                 if (err)
 274                         platform_driver_unregister(&physmap_flash_driver);
 275         }
 276 #endif
 277
 278         return err;
 279 }
 280
 281 static void __exit physmap_exit(void)
 282 {
 283 #ifdef CONFIG_MTD_PHYSMAP_COMPAT
 284         platform_device_unregister(&physmap_flash);
 285 #endif
 286         platform_driver_unregister(&physmap_flash_driver);
 287 }
 288
 289 module_init(physmap_init);
 290 module_exit(physmap_exit);
 291
 292 MODULE_LICENSE("GPL");
 293 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
 294 MODULE_DESCRIPTION("Generic configurable MTD map driver");
 295
 296 /* legacy platform drivers can't hotplug or coldplg */
 297 #ifndef CONFIG_MTD_PHYSMAP_COMPAT
 298 /* work with hotplug and coldplug */
 299 MODULE_ALIAS("platform:physmap-flash");
 300 #endif