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/config.h>
  22 #include <linux/mtd/partitions.h>
  23 #include <linux/mtd/physmap.h>
  24 #include <asm/io.h>
  25
  26 struct physmap_flash_info {
  27         struct mtd_info         *mtd;
  28         struct map_info         map;
  29         struct resource         *res;
  30 #ifdef CONFIG_MTD_PARTITIONS
  31         int                     nr_parts;
  32         struct mtd_partition    *parts;
  33 #endif
  34 };
  35
  36
  37 static int physmap_flash_remove(struct platform_device *dev)
  38 {
  39         struct physmap_flash_info *info;
  40         struct physmap_flash_data *physmap_data;
  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->mtd != NULL) {
  50 #ifdef CONFIG_MTD_PARTITIONS
  51                 if (info->nr_parts) {
  52                         del_mtd_partitions(info->mtd);
  53                         kfree(info->parts);
  54                 } else if (physmap_data->nr_parts) {
  55                         del_mtd_partitions(info->mtd);
  56                 } else {
  57                         del_mtd_device(info->mtd);
  58                 }
  59 #else
  60                 del_mtd_device(info->mtd);
  61 #endif
  62                 map_destroy(info->mtd);
  63         }
  64
  65         if (info->map.virt != NULL)
  66                 iounmap((void *)info->map.virt);
  67
  68         if (info->res != NULL) {
  69                 release_resource(info->res);
  70                 kfree(info->res);
  71         }
  72
  73         return 0;
  74 }
  75
  76 static const char *rom_probe_types[] = { "cfi_probe", "jedec_probe", "map_rom", NULL };
  77 #ifdef CONFIG_MTD_PARTITIONS
  78 static const char *part_probe_types[] = { "cmdlinepart", "RedBoot", NULL };
  79 #endif
  80
  81 static int physmap_flash_probe(struct platform_device *dev)
  82 {
  83         struct physmap_flash_data *physmap_data;
  84         struct physmap_flash_info *info;
  85         const char **probe_type;
  86         int err;
  87
  88         physmap_data = dev->dev.platform_data;
  89         if (physmap_data == NULL)
  90                 return -ENODEV;
  91
  92         printk(KERN_NOTICE "physmap platform flash device: %.8llx at %.8llx\n",
  93             (unsigned long long)dev->resource->end - dev->resource->start + 1,
  94             (unsigned long long)dev->resource->start);
  95
  96         info = kmalloc(sizeof(struct physmap_flash_info), GFP_KERNEL);
  97         if (info == NULL) {
  98                 err = -ENOMEM;
  99                 goto err_out;
 100         }
 101         memset(info, 0, sizeof(*info));
 102
 103         platform_set_drvdata(dev, info);
 104
 105         info->res = request_mem_region(dev->resource->start,
 106                         dev->resource->end - dev->resource->start + 1,
 107                         dev->dev.bus_id);
 108         if (info->res == NULL) {
 109                 dev_err(&dev->dev, "Could not reserve memory region\n");
 110                 err = -ENOMEM;
 111                 goto err_out;
 112         }
 113
 114         info->map.name = dev->dev.bus_id;
 115         info->map.phys = dev->resource->start;
 116         info->map.size = dev->resource->end - dev->resource->start + 1;
 117         info->map.bankwidth = physmap_data->width;
 118         info->map.set_vpp = physmap_data->set_vpp;
 119
 120         info->map.virt = ioremap(info->map.phys, info->map.size);
 121         if (info->map.virt == NULL) {
 122                 dev_err(&dev->dev, "Failed to ioremap flash region\n");
 123                 err = EIO;
 124                 goto err_out;
 125         }
 126
 127         simple_map_init(&info->map);
 128
 129         probe_type = rom_probe_types;
 130         for (; info->mtd == NULL && *probe_type != NULL; probe_type++)
 131                 info->mtd = do_map_probe(*probe_type, &info->map);
 132         if (info->mtd == NULL) {
 133                 dev_err(&dev->dev, "map_probe failed\n");
 134                 err = -ENXIO;
 135                 goto err_out;
 136         }
 137         info->mtd->owner = THIS_MODULE;
 138
 139 #ifdef CONFIG_MTD_PARTITIONS
 140         err = parse_mtd_partitions(info->mtd, part_probe_types, &info->parts, 0);
 141         if (err > 0) {
 142                 add_mtd_partitions(info->mtd, info->parts, err);
 143                 return 0;
 144         }
 145
 146         if (physmap_data->nr_parts) {
 147                 printk(KERN_NOTICE "Using physmap partition information\n");
 148                 add_mtd_partitions(info->mtd, physmap_data->parts,
 149                                                 physmap_data->nr_parts);
 150                 return 0;
 151         }
 152 #endif
 153
 154         add_mtd_device(info->mtd);
 155         return 0;
 156
 157 err_out:
 158         physmap_flash_remove(dev);
 159         return err;
 160 }
 161
 162 static struct platform_driver physmap_flash_driver = {
 163         .probe          = physmap_flash_probe,
 164         .remove         = physmap_flash_remove,
 165         .driver         = {
 166                 .name   = "physmap-flash",
 167         },
 168 };
 169
 170
 171 #ifdef CONFIG_MTD_PHYSMAP_LEN
 172 #if CONFIG_MTD_PHYSMAP_LEN != 0
 173 #warning using PHYSMAP compat code
 174 #define PHYSMAP_COMPAT
 175 #endif
 176 #endif
 177
 178 #ifdef PHYSMAP_COMPAT
 179 static struct physmap_flash_data physmap_flash_data = {
 180         .width          = CONFIG_MTD_PHYSMAP_BANKWIDTH,
 181 };
 182
 183 static struct resource physmap_flash_resource = {
 184         .start          = CONFIG_MTD_PHYSMAP_START,
 185         .end            = CONFIG_MTD_PHYSMAP_START + CONFIG_MTD_PHYSMAP_LEN,
 186         .flags          = IORESOURCE_MEM,
 187 };
 188
 189 static struct platform_device physmap_flash = {
 190         .name           = "physmap-flash",
 191         .id             = 0,
 192         .dev            = {
 193                 .platform_data  = &physmap_flash_data,
 194         },
 195         .num_resources  = 1,
 196         .resource       = &physmap_flash_resource,
 197 };
 198
 199 void physmap_configure(unsigned long addr, unsigned long size,
 200                 int bankwidth, void (*set_vpp)(struct map_info *, int))
 201 {
 202         physmap_flash_resource.start = addr;
 203         physmap_flash_resource.end = addr + size - 1;
 204         physmap_flash_data.width = bankwidth;
 205         physmap_flash_data.set_vpp = set_vpp;
 206 }
 207
 208 #ifdef CONFIG_MTD_PARTITIONS
 209 void physmap_set_partitions(struct mtd_partition *parts, int num_parts)
 210 {
 211         physmap_flash_data.nr_parts = num_parts;
 212         physmap_flash_data.parts = parts;
 213 }
 214 #endif
 215 #endif
 216
 217 static int __init physmap_init(void)
 218 {
 219         int err;
 220
 221         err = platform_driver_register(&physmap_flash_driver);
 222 #ifdef PHYSMAP_COMPAT
 223         if (err == 0)
 224                 platform_device_register(&physmap_flash);
 225 #endif
 226
 227         return err;
 228 }
 229
 230 static void __exit physmap_exit(void)
 231 {
 232 #ifdef PHYSMAP_COMPAT
 233         platform_device_unregister(&physmap_flash);
 234 #endif
 235         platform_driver_unregister(&physmap_flash_driver);
 236 }
 237
 238 module_init(physmap_init);
 239 module_exit(physmap_exit);
 240
 241 MODULE_LICENSE("GPL");
 242 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
 243 MODULE_DESCRIPTION("Generic configurable MTD map driver");