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 <asm/io.h>
  24
  25 struct physmap_flash_info {
  26         struct mtd_info         *mtd;
  27         struct map_info         map;
  28         struct resource         *res;
  29 #ifdef CONFIG_MTD_PARTITIONS
  30         int                     nr_parts;
  31         struct mtd_partition    *parts;
  32 #endif
  33 };
  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
  41         info = platform_get_drvdata(dev);
  42         if (info == NULL)
  43                 return 0;
  44         platform_set_drvdata(dev, NULL);
  45
  46         physmap_data = dev->dev.platform_data;
  47
  48         if (info->mtd != NULL) {
  49 #ifdef CONFIG_MTD_PARTITIONS
  50                 if (info->nr_parts) {
  51                         del_mtd_partitions(info->mtd);
  52                         kfree(info->parts);
  53                 } else if (physmap_data->nr_parts) {
  54                         del_mtd_partitions(info->mtd);
  55                 } else {
  56                         del_mtd_device(info->mtd);
  57                 }
  58 #else
  59                 del_mtd_device(info->mtd);
  60 #endif
  61                 map_destroy(info->mtd);
  62         }
  63
  64         if (info->map.virt != NULL)
  65                 iounmap(info->map.virt);
  66
  67         if (info->res != NULL) {
  68                 release_resource(info->res);
  69                 kfree(info->res);
  70         }
  71
  72         return 0;
  73 }
  74
  75 static const char *rom_probe_types[] = { "cfi_probe", "jedec_probe", "map_rom", NULL };
  76 #ifdef CONFIG_MTD_PARTITIONS
  77 static const char *part_probe_types[] = { "cmdlinepart", "RedBoot", NULL };
  78 #endif
  79
  80 static int physmap_flash_probe(struct platform_device *dev)
  81 {
  82         struct physmap_flash_data *physmap_data;
  83         struct physmap_flash_info *info;
  84         const char **probe_type;
  85         int err;
  86
  87         physmap_data = dev->dev.platform_data;
  88         if (physmap_data == NULL)
  89                 return -ENODEV;
  90
  91         printk(KERN_NOTICE "physmap platform flash device: %.8llx at %.8llx\n",
  92             (unsigned long long)(dev->resource->end - dev->resource->start + 1),
  93             (unsigned long long)dev->resource->start);
  94
  95         info = kzalloc(sizeof(struct physmap_flash_info), GFP_KERNEL);
  96         if (info == NULL) {
  97                 err = -ENOMEM;
  98                 goto err_out;
  99         }
 100
 101         platform_set_drvdata(dev, info);
 102
 103         info->res = request_mem_region(dev->resource->start,
 104                         dev->resource->end - dev->resource->start + 1,
 105                         dev->dev.bus_id);
 106         if (info->res == NULL) {
 107                 dev_err(&dev->dev, "Could not reserve memory region\n");
 108                 err = -ENOMEM;
 109                 goto err_out;
 110         }
 111
 112         info->map.name = dev->dev.bus_id;
 113         info->map.phys = dev->resource->start;
 114         info->map.size = dev->resource->end - dev->resource->start + 1;
 115         info->map.bankwidth = physmap_data->width;
 116         info->map.set_vpp = physmap_data->set_vpp;
 117
 118         info->map.virt = ioremap(info->map.phys, info->map.size);
 119         if (info->map.virt == NULL) {
 120                 dev_err(&dev->dev, "Failed to ioremap flash region\n");
 121                 err = EIO;
 122                 goto err_out;
 123         }
 124
 125         simple_map_init(&info->map);
 126
 127         probe_type = rom_probe_types;
 128         for (; info->mtd == NULL && *probe_type != NULL; probe_type++)
 129                 info->mtd = do_map_probe(*probe_type, &info->map);
 130         if (info->mtd == NULL) {
 131                 dev_err(&dev->dev, "map_probe failed\n");
 132                 err = -ENXIO;
 133                 goto err_out;
 134         }
 135         info->mtd->owner = THIS_MODULE;
 136
 137 #ifdef CONFIG_MTD_PARTITIONS
 138         err = parse_mtd_partitions(info->mtd, part_probe_types, &info->parts, 0);
 139         if (err > 0) {
 140                 add_mtd_partitions(info->mtd, info->parts, err);
 141                 return 0;
 142         }
 143
 144         if (physmap_data->nr_parts) {
 145                 printk(KERN_NOTICE "Using physmap partition information\n");
 146                 add_mtd_partitions(info->mtd, physmap_data->parts,
 147                                                 physmap_data->nr_parts);
 148                 return 0;
 149         }
 150 #endif
 151
 152         add_mtd_device(info->mtd);
 153         return 0;
 154
 155 err_out:
 156         physmap_flash_remove(dev);
 157         return err;
 158 }
 159
 160 #ifdef CONFIG_PM
 161 static int physmap_flash_suspend(struct platform_device *dev, pm_message_t state)
 162 {
 163         struct physmap_flash_info *info = platform_get_drvdata(dev);
 164         int ret = 0;
 165
 166         if (info)
 167                 ret = info->mtd->suspend(info->mtd);
 168
 169         return ret;
 170 }
 171
 172 static int physmap_flash_resume(struct platform_device *dev)
 173 {
 174         struct physmap_flash_info *info = platform_get_drvdata(dev);
 175         if (info)
 176                 info->mtd->resume(info->mtd);
 177         return 0;
 178 }
 179
 180 static void physmap_flash_shutdown(struct platform_device *dev)
 181 {
 182         struct physmap_flash_info *info = platform_get_drvdata(dev);
 183         if (info && info->mtd->suspend(info->mtd) == 0)
 184                 info->mtd->resume(info->mtd);
 185 }
 186 #endif
 187
 188 static struct platform_driver physmap_flash_driver = {
 189         .probe          = physmap_flash_probe,
 190         .remove         = physmap_flash_remove,
 191 #ifdef CONFIG_PM
 192         .suspend        = physmap_flash_suspend,
 193         .resume         = physmap_flash_resume,
 194         .shutdown       = physmap_flash_shutdown,
 195 #endif
 196         .driver         = {
 197                 .name   = "physmap-flash",
 198         },
 199 };
 200
 201
 202 #ifdef CONFIG_MTD_PHYSMAP_LEN
 203 #if CONFIG_MTD_PHYSMAP_LEN != 0
 204 #warning using PHYSMAP compat code
 205 #define PHYSMAP_COMPAT
 206 #endif
 207 #endif
 208
 209 #ifdef PHYSMAP_COMPAT
 210 static struct physmap_flash_data physmap_flash_data = {
 211         .width          = CONFIG_MTD_PHYSMAP_BANKWIDTH,
 212 };
 213
 214 static struct resource physmap_flash_resource = {
 215         .start          = CONFIG_MTD_PHYSMAP_START,
 216         .end            = CONFIG_MTD_PHYSMAP_START + CONFIG_MTD_PHYSMAP_LEN - 1,
 217         .flags          = IORESOURCE_MEM,
 218 };
 219
 220 static struct platform_device physmap_flash = {
 221         .name           = "physmap-flash",
 222         .id             = 0,
 223         .dev            = {
 224                 .platform_data  = &physmap_flash_data,
 225         },
 226         .num_resources  = 1,
 227         .resource       = &physmap_flash_resource,
 228 };
 229
 230 void physmap_configure(unsigned long addr, unsigned long size,
 231                 int bankwidth, void (*set_vpp)(struct map_info *, int))
 232 {
 233         physmap_flash_resource.start = addr;
 234         physmap_flash_resource.end = addr + size - 1;
 235         physmap_flash_data.width = bankwidth;
 236         physmap_flash_data.set_vpp = set_vpp;
 237 }
 238
 239 #ifdef CONFIG_MTD_PARTITIONS
 240 void physmap_set_partitions(struct mtd_partition *parts, int num_parts)
 241 {
 242         physmap_flash_data.nr_parts = num_parts;
 243         physmap_flash_data.parts = parts;
 244 }
 245 #endif
 246 #endif
 247
 248 static int __init physmap_init(void)
 249 {
 250         int err;
 251
 252         err = platform_driver_register(&physmap_flash_driver);
 253 #ifdef PHYSMAP_COMPAT
 254         if (err == 0)
 255                 platform_device_register(&physmap_flash);
 256 #endif
 257
 258         return err;
 259 }
 260
 261 static void __exit physmap_exit(void)
 262 {
 263 #ifdef PHYSMAP_COMPAT
 264         platform_device_unregister(&physmap_flash);
 265 #endif
 266         platform_driver_unregister(&physmap_flash_driver);
 267 }
 268
 269 module_init(physmap_init);
 270 module_exit(physmap_exit);
 271
 272 MODULE_LICENSE("GPL");
 273 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
 274 MODULE_DESCRIPTION("Generic configurable MTD map driver");