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((void *)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 = kmalloc(sizeof(struct physmap_flash_info), GFP_KERNEL);
  96         if (info == NULL) {
  97                 err = -ENOMEM;
  98                 goto err_out;
  99         }
 100         memset(info, 0, sizeof(*info));
 101
 102         platform_set_drvdata(dev, info);
 103
 104         info->res = request_mem_region(dev->resource->start,
 105                         dev->resource->end - dev->resource->start + 1,
 106                         dev->dev.bus_id);
 107         if (info->res == NULL) {
 108                 dev_err(&dev->dev, "Could not reserve memory region\n");
 109                 err = -ENOMEM;
 110                 goto err_out;
 111         }
 112
 113         info->map.name = dev->dev.bus_id;
 114         info->map.phys = dev->resource->start;
 115         info->map.size = dev->resource->end - dev->resource->start + 1;
 116         info->map.bankwidth = physmap_data->width;
 117         info->map.set_vpp = physmap_data->set_vpp;
 118
 119         info->map.virt = ioremap(info->map.phys, info->map.size);
 120         if (info->map.virt == NULL) {
 121                 dev_err(&dev->dev, "Failed to ioremap flash region\n");
 122                 err = EIO;
 123                 goto err_out;
 124         }
 125
 126         simple_map_init(&info->map);
 127
 128         probe_type = rom_probe_types;
 129         for (; info->mtd == NULL && *probe_type != NULL; probe_type++)
 130                 info->mtd = do_map_probe(*probe_type, &info->map);
 131         if (info->mtd == NULL) {
 132                 dev_err(&dev->dev, "map_probe failed\n");
 133                 err = -ENXIO;
 134                 goto err_out;
 135         }
 136         info->mtd->owner = THIS_MODULE;
 137
 138 #ifdef CONFIG_MTD_PARTITIONS
 139         err = parse_mtd_partitions(info->mtd, part_probe_types, &info->parts, 0);
 140         if (err > 0) {
 141                 add_mtd_partitions(info->mtd, info->parts, err);
 142                 return 0;
 143         }
 144
 145         if (physmap_data->nr_parts) {
 146                 printk(KERN_NOTICE "Using physmap partition information\n");
 147                 add_mtd_partitions(info->mtd, physmap_data->parts,
 148                                                 physmap_data->nr_parts);
 149                 return 0;
 150         }
 151 #endif
 152
 153         add_mtd_device(info->mtd);
 154         return 0;
 155
 156 err_out:
 157         physmap_flash_remove(dev);
 158         return err;
 159 }
 160
 161 static struct platform_driver physmap_flash_driver = {
 162         .probe          = physmap_flash_probe,
 163         .remove         = physmap_flash_remove,
 164         .driver         = {
 165                 .name   = "physmap-flash",
 166         },
 167 };
 168
 169
 170 #ifdef CONFIG_MTD_PHYSMAP_LEN
 171 #if CONFIG_MTD_PHYSMAP_LEN != 0
 172 #warning using PHYSMAP compat code
 173 #define PHYSMAP_COMPAT
 174 #endif
 175 #endif
 176
 177 #ifdef PHYSMAP_COMPAT
 178 static struct physmap_flash_data physmap_flash_data = {
 179         .width          = CONFIG_MTD_PHYSMAP_BANKWIDTH,
 180 };
 181
 182 static struct resource physmap_flash_resource = {
 183         .start          = CONFIG_MTD_PHYSMAP_START,
 184         .end            = CONFIG_MTD_PHYSMAP_START + CONFIG_MTD_PHYSMAP_LEN - 1,
 185         .flags          = IORESOURCE_MEM,
 186 };
 187
 188 static struct platform_device physmap_flash = {
 189         .name           = "physmap-flash",
 190         .id             = 0,
 191         .dev            = {
 192                 .platform_data  = &physmap_flash_data,
 193         },
 194         .num_resources  = 1,
 195         .resource       = &physmap_flash_resource,
 196 };
 197
 198 void physmap_configure(unsigned long addr, unsigned long size,
 199                 int bankwidth, void (*set_vpp)(struct map_info *, int))
 200 {
 201         physmap_flash_resource.start = addr;
 202         physmap_flash_resource.end = addr + size - 1;
 203         physmap_flash_data.width = bankwidth;
 204         physmap_flash_data.set_vpp = set_vpp;
 205 }
 206
 207 #ifdef CONFIG_MTD_PARTITIONS
 208 void physmap_set_partitions(struct mtd_partition *parts, int num_parts)
 209 {
 210         physmap_flash_data.nr_parts = num_parts;
 211         physmap_flash_data.parts = parts;
 212 }
 213 #endif
 214 #endif
 215
 216 static int __init physmap_init(void)
 217 {
 218         int err;
 219
 220         err = platform_driver_register(&physmap_flash_driver);
 221 #ifdef PHYSMAP_COMPAT
 222         if (err == 0)
 223                 platform_device_register(&physmap_flash);
 224 #endif
 225
 226         return err;
 227 }
 228
 229 static void __exit physmap_exit(void)
 230 {
 231 #ifdef PHYSMAP_COMPAT
 232         platform_device_unregister(&physmap_flash);
 233 #endif
 234         platform_driver_unregister(&physmap_flash_driver);
 235 }
 236
 237 module_init(physmap_init);
 238 module_exit(physmap_exit);
 239
 240 MODULE_LICENSE("GPL");
 241 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
 242 MODULE_DESCRIPTION("Generic configurable MTD map driver");