drivers/mtd/maps/physmap.c

   1 /*
   2  * $Id: physmap.c,v 1.39 2005/11/29 14:49:36 gleixner Exp $
   3  *
   4  * Normal mappings of chips in physical memory
   5  *
   6  * Copyright (C) 2003 MontaVista Software Inc.
   7  * Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
   8  *
   9  * 031022 - [jsun] add run-time configure and partition setup
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/types.h>
  14 #include <linux/kernel.h>
  15 #include <linux/init.h>
  16 #include <linux/slab.h>
  17 #include <linux/device.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/mtd/mtd.h>
  20 #include <linux/mtd/map.h>
  21 #include <linux/mtd/partitions.h>
  22 #include <linux/mtd/physmap.h>
  23 #include <linux/mtd/concat.h>
  24 #include <asm/io.h>
  25
  26 #define MAX_RESOURCES           4
  27
  28 struct physmap_flash_info {
  29         struct mtd_info         *mtd[MAX_RESOURCES];
  30         struct mtd_info         *cmtd;
  31         struct map_info         map[MAX_RESOURCES];
  32         struct resource         *res;
  33 #ifdef CONFIG_MTD_PARTITIONS
  34         int                     nr_parts;
  35         struct mtd_partition    *parts;
  36 #endif
  37 };
  38
  39 static int physmap_flash_remove(struct platform_device *dev)
  40 {
  41         struct physmap_flash_info *info;
  42         struct physmap_flash_data *physmap_data;
  43         int i;
  44
  45         info = platform_get_drvdata(dev);
  46         if (info == NULL)
  47                 return 0;
  48         platform_set_drvdata(dev, NULL);
  49
  50         physmap_data = dev->dev.platform_data;
  51
  52 #ifdef CONFIG_MTD_CONCAT
  53         if (info->cmtd != info->mtd[0]) {
  54                 del_mtd_device(info->cmtd);
  55                 mtd_concat_destroy(info->cmtd);
  56         }
  57 #endif
  58
  59         for (i = 0; i < MAX_RESOURCES; i++) {
  60                 if (info->mtd[i] != NULL) {
  61 #ifdef CONFIG_MTD_PARTITIONS
  62                         if (info->nr_parts) {
  63                                 del_mtd_partitions(info->mtd[i]);
  64                                 kfree(info->parts);
  65                         } else if (physmap_data->nr_parts) {
  66                                 del_mtd_partitions(info->mtd[i]);
  67                         } else {
  68                                 del_mtd_device(info->mtd[i]);
  69                         }
  70 #else
  71                         del_mtd_device(info->mtd[i]);
  72 #endif
  73                         map_destroy(info->mtd[i]);
  74                 }
  75
  76                 if (info->map[i].virt != NULL)
  77                         iounmap(info->map[i].virt);
  78         }
  79
  80         if (info->res != NULL) {
  81                 release_resource(info->res);
  82                 kfree(info->res);
  83         }
  84
  85         return 0;
  86 }
  87
  88 static const char *rom_probe_types[] = { "cfi_probe", "jedec_probe", "map_rom", NULL };
  89 #ifdef CONFIG_MTD_PARTITIONS
  90 static const char *part_probe_types[] = { "cmdlinepart", "RedBoot", NULL };
  91 #endif
  92
  93 static int physmap_flash_probe(struct platform_device *dev)
  94 {
  95         struct physmap_flash_data *physmap_data;
  96         struct physmap_flash_info *info;
  97         const char **probe_type;
  98         int err = 0;
  99         int i;
 100         int devices_found = 0;
 101
 102         physmap_data = dev->dev.platform_data;
 103         if (physmap_data == NULL)
 104                 return -ENODEV;
 105
 106         info = kzalloc(sizeof(struct physmap_flash_info), GFP_KERNEL);
 107         if (info == NULL) {
 108                 err = -ENOMEM;
 109                 goto err_out;
 110         }
 111
 112         platform_set_drvdata(dev, info);
 113
 114         for (i = 0; i < dev->num_resources; i++) {
 115                 printk(KERN_NOTICE "physmap platform flash device: %.8llx at %.8llx\n",
 116                        (unsigned long long)(dev->resource[i].end - dev->resource[i].start + 1),
 117                        (unsigned long long)dev->resource[i].start);
 118
 119                 info->res = request_mem_region(dev->resource[i].start,
 120                                                dev->resource[i].end - dev->resource[i].start + 1,
 121                                                dev->dev.bus_id);
 122                 if (info->res == NULL) {
 123                         dev_err(&dev->dev, "Could not reserve memory region\n");
 124                         err = -ENOMEM;
 125                         goto err_out;
 126                 }
 127
 128                 info->map[i].name = dev->dev.bus_id;
 129                 info->map[i].phys = dev->resource[i].start;
 130                 info->map[i].size = dev->resource[i].end - dev->resource[i].start + 1;
 131                 info->map[i].bankwidth = physmap_data->width;
 132                 info->map[i].set_vpp = physmap_data->set_vpp;
 133
 134                 info->map[i].virt = ioremap(info->map[i].phys, info->map[i].size);
 135                 if (info->map[i].virt == NULL) {
 136                         dev_err(&dev->dev, "Failed to ioremap flash region\n");
 137                         err = EIO;
 138                         goto err_out;
 139                 }
 140
 141                 simple_map_init(&info->map[i]);
 142
 143                 probe_type = rom_probe_types;
 144                 for (; info->mtd[i] == NULL && *probe_type != NULL; probe_type++)
 145                         info->mtd[i] = do_map_probe(*probe_type, &info->map[i]);
 146                 if (info->mtd[i] == NULL) {
 147                         dev_err(&dev->dev, "map_probe failed\n");
 148                         err = -ENXIO;
 149                         goto err_out;
 150                 } else {
 151                         devices_found++;
 152                 }
 153                 info->mtd[i]->owner = THIS_MODULE;
 154         }
 155
 156         if (devices_found == 1) {
 157                 info->cmtd = info->mtd[0];
 158         } else if (devices_found > 1) {
 159                 /*
 160                  * We detected multiple devices. Concatenate them together.
 161                  */
 162 #ifdef CONFIG_MTD_CONCAT
 163                 info->cmtd = mtd_concat_create(info->mtd, devices_found, dev->dev.bus_id);
 164                 if (info->cmtd == NULL)
 165                         err = -ENXIO;
 166 #else
 167                 printk(KERN_ERR "physmap-flash: multiple devices "
 168                        "found but MTD concat support disabled.\n");
 169                 err = -ENXIO;
 170 #endif
 171         }
 172         if (err)
 173                 goto err_out;
 174
 175 #ifdef CONFIG_MTD_PARTITIONS
 176         err = parse_mtd_partitions(info->cmtd, part_probe_types, &info->parts, 0);
 177         if (err > 0) {
 178                 add_mtd_partitions(info->cmtd, info->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 #endif
 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 int physmap_flash_suspend(struct platform_device *dev, pm_message_t state)
 200 {
 201         struct physmap_flash_info *info = platform_get_drvdata(dev);
 202         int ret = 0;
 203         int i;
 204
 205         if (info)
 206                 for (i = 0; i < MAX_RESOURCES; i++)
 207                         ret |= info->mtd[i]->suspend(info->mtd[i]);
 208
 209         return ret;
 210 }
 211
 212 static int physmap_flash_resume(struct platform_device *dev)
 213 {
 214         struct physmap_flash_info *info = platform_get_drvdata(dev);
 215         int i;
 216
 217         if (info)
 218                 for (i = 0; i < MAX_RESOURCES; i++)
 219                         info->mtd[i]->resume(info->mtd[i]);
 220         return 0;
 221 }
 222
 223 static void physmap_flash_shutdown(struct platform_device *dev)
 224 {
 225         struct physmap_flash_info *info = platform_get_drvdata(dev);
 226         int i;
 227
 228         for (i = 0; i < MAX_RESOURCES; i++)
 229                 if (info && 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         },
 247 };
 248
 249
 250 #ifdef CONFIG_MTD_PHYSMAP_LEN
 251 #if CONFIG_MTD_PHYSMAP_LEN != 0
 252 #warning using PHYSMAP compat code
 253 #define PHYSMAP_COMPAT
 254 #endif
 255 #endif
 256
 257 #ifdef PHYSMAP_COMPAT
 258 static struct physmap_flash_data physmap_flash_data = {
 259         .width          = CONFIG_MTD_PHYSMAP_BANKWIDTH,
 260 };
 261
 262 static struct resource physmap_flash_resource = {
 263         .start          = CONFIG_MTD_PHYSMAP_START,
 264         .end            = CONFIG_MTD_PHYSMAP_START + CONFIG_MTD_PHYSMAP_LEN - 1,
 265         .flags          = IORESOURCE_MEM,
 266 };
 267
 268 static struct platform_device physmap_flash = {
 269         .name           = "physmap-flash",
 270         .id             = 0,
 271         .dev            = {
 272                 .platform_data  = &physmap_flash_data,
 273         },
 274         .num_resources  = 1,
 275         .resource       = &physmap_flash_resource,
 276 };
 277
 278 void physmap_configure(unsigned long addr, unsigned long size,
 279                 int bankwidth, void (*set_vpp)(struct map_info *, int))
 280 {
 281         physmap_flash_resource.start = addr;
 282         physmap_flash_resource.end = addr + size - 1;
 283         physmap_flash_data.width = bankwidth;
 284         physmap_flash_data.set_vpp = set_vpp;
 285 }
 286
 287 #ifdef CONFIG_MTD_PARTITIONS
 288 void physmap_set_partitions(struct mtd_partition *parts, int num_parts)
 289 {
 290         physmap_flash_data.nr_parts = num_parts;
 291         physmap_flash_data.parts = parts;
 292 }
 293 #endif
 294 #endif
 295
 296 static int __init physmap_init(void)
 297 {
 298         int err;
 299
 300         err = platform_driver_register(&physmap_flash_driver);
 301 #ifdef PHYSMAP_COMPAT
 302         if (err == 0)
 303                 platform_device_register(&physmap_flash);
 304 #endif
 305
 306         return err;
 307 }
 308
 309 static void __exit physmap_exit(void)
 310 {
 311 #ifdef PHYSMAP_COMPAT
 312         platform_device_unregister(&physmap_flash);
 313 #endif
 314         platform_driver_unregister(&physmap_flash_driver);
 315 }
 316
 317 module_init(physmap_init);
 318 module_exit(physmap_exit);
 319
 320 MODULE_LICENSE("GPL");
 321 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
 322 MODULE_DESCRIPTION("Generic configurable MTD map driver");