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   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 #include <asm/mach/flash.h>
  26
  27 struct physmap_flash_info {
  28         struct mtd_info         *mtd;
  29         struct map_info         map;
  30         struct resource         *res;
  31 #ifdef CONFIG_MTD_PARTITIONS
  32         int                     nr_parts;
  33         struct mtd_partition    *parts;
  34 #endif
  35 };
  36
  37
  38 static int physmap_flash_remove(struct platform_device *dev)
  39 {
  40         struct physmap_flash_info *info;
  41         struct physmap_flash_data *physmap_data;
  42
  43         info = platform_get_drvdata(dev);
  44         if (info == NULL)
  45                 return 0;
  46         platform_set_drvdata(dev, NULL);
  47
  48         physmap_data = dev->dev.platform_data;
  49
  50         if (info->mtd != NULL) {
  51 #ifdef CONFIG_MTD_PARTITIONS
  52                 if (info->nr_parts) {
  53                         del_mtd_partitions(info->mtd);
  54                         kfree(info->parts);
  55                 } else if (physmap_data->nr_parts) {
  56                         del_mtd_partitions(info->mtd);
  57                 } else {
  58                         del_mtd_device(info->mtd);
  59                 }
  60 #else
  61                 del_mtd_device(info->mtd);
  62 #endif
  63                 map_destroy(info->mtd);
  64         }
  65
  66         if (info->map.virt != NULL)
  67                 iounmap((void *)info->map.virt);
  68
  69         if (info->res != NULL) {
  70                 release_resource(info->res);
  71                 kfree(info->res);
  72         }
  73
  74         return 0;
  75 }
  76
  77 static const char *rom_probe_types[] = { "cfi_probe", "jedec_probe", "map_rom", NULL };
  78 #ifdef CONFIG_MTD_PARTITIONS
  79 static const char *part_probe_types[] = { "cmdlinepart", "RedBoot", NULL };
  80 #endif
  81
  82 static int physmap_flash_probe(struct platform_device *dev)
  83 {
  84         struct physmap_flash_data *physmap_data;
  85         struct physmap_flash_info *info;
  86         const char **probe_type;
  87         int err;
  88
  89         physmap_data = dev->dev.platform_data;
  90         if (physmap_data == NULL)
  91                 return -ENODEV;
  92
  93         printk(KERN_NOTICE "physmap platform flash device: %.8lx at %.8lx\n",
  94                 dev->resource->end - dev->resource->start + 1,
  95                 dev->resource->start);
  96
  97         info = kmalloc(sizeof(struct physmap_flash_info), GFP_KERNEL);
  98         if (info == NULL) {
  99                 err = -ENOMEM;
 100                 goto err_out;
 101         }
 102         memset(info, 0, sizeof(*info));
 103
 104         platform_set_drvdata(dev, info);
 105
 106         info->res = request_mem_region(dev->resource->start,
 107                         dev->resource->end - dev->resource->start + 1,
 108                         dev->dev.bus_id);
 109         if (info->res == NULL) {
 110                 dev_err(&dev->dev, "Could not reserve memory region\n");
 111                 err = -ENOMEM;
 112                 goto err_out;
 113         }
 114
 115         info->map.name = dev->dev.bus_id;
 116         info->map.phys = dev->resource->start;
 117         info->map.size = dev->resource->end - dev->resource->start + 1;
 118         info->map.bankwidth = physmap_data->width;
 119         info->map.set_vpp = physmap_data->set_vpp;
 120
 121         info->map.virt = ioremap(info->map.phys, info->map.size);
 122         if (info->map.virt == NULL) {
 123                 dev_err(&dev->dev, "Failed to ioremap flash region\n");
 124                 err = EIO;
 125                 goto err_out;
 126         }
 127
 128         simple_map_init(&info->map);
 129
 130         probe_type = rom_probe_types;
 131         for (; info->mtd == NULL && *probe_type != NULL; probe_type++)
 132                 info->mtd = do_map_probe(*probe_type, &info->map);
 133         if (info->mtd == NULL) {
 134                 dev_err(&dev->dev, "map_probe failed\n");
 135                 err = -ENXIO;
 136                 goto err_out;
 137         }
 138         info->mtd->owner = THIS_MODULE;
 139
 140 #ifdef CONFIG_MTD_PARTITIONS
 141         err = parse_mtd_partitions(info->mtd, part_probe_types, &info->parts, 0);
 142         if (err > 0) {
 143                 add_mtd_partitions(info->mtd, info->parts, err);
 144                 return 0;
 145         }
 146
 147         if (physmap_data->nr_parts) {
 148                 printk(KERN_NOTICE "Using physmap partition information\n");
 149                 add_mtd_partitions(info->mtd, physmap_data->parts,
 150                                                 physmap_data->nr_parts);
 151                 return 0;
 152         }
 153 #endif
 154
 155         add_mtd_device(info->mtd);
 156         return 0;
 157
 158 err_out:
 159         physmap_flash_remove(dev);
 160         return err;
 161 }
 162
 163 static struct platform_driver physmap_flash_driver = {
 164         .probe          = physmap_flash_probe,
 165         .remove         = physmap_flash_remove,
 166         .driver         = {
 167                 .name   = "physmap-flash",
 168         },
 169 };
 170
 171
 172 #ifdef CONFIG_MTD_PHYSMAP_LEN
 173 #if CONFIG_MTD_PHYSMAP_LEN != 0
 174 #warning using PHYSMAP compat code
 175 #define PHYSMAP_COMPAT
 176 #endif
 177 #endif
 178
 179 #ifdef PHYSMAP_COMPAT
 180 static struct physmap_flash_data physmap_flash_data = {
 181         .width          = CONFIG_MTD_PHYSMAP_BANKWIDTH,
 182 };
 183
 184 static struct resource physmap_flash_resource = {
 185         .start          = CONFIG_MTD_PHYSMAP_START,
 186         .end            = CONFIG_MTD_PHYSMAP_START + CONFIG_MTD_PHYSMAP_LEN,
 187         .flags          = IORESOURCE_MEM,
 188 };
 189
 190 static struct platform_device physmap_flash = {
 191         .name           = "physmap-flash",
 192         .id             = 0,
 193         .dev            = {
 194                 .platform_data  = &physmap_flash_data,
 195         },
 196         .num_resources  = 1,
 197         .resource       = &physmap_flash_resource,
 198 };
 199
 200 void physmap_configure(unsigned long addr, unsigned long size,
 201                 int bankwidth, void (*set_vpp)(struct map_info *, int))
 202 {
 203         physmap_flash_resource.start = addr;
 204         physmap_flash_resource.end = addr + size - 1;
 205         physmap_flash_data.width = bankwidth;
 206         physmap_flash_data.set_vpp = set_vpp;
 207 }
 208
 209 #ifdef CONFIG_MTD_PARTITIONS
 210 void physmap_set_partitions(struct mtd_partition *parts, int num_parts)
 211 {
 212         physmap_flash_data.nr_parts = num_parts;
 213         physmap_flash_data.parts = parts;
 214 }
 215 #endif
 216 #endif
 217
 218 static int __init physmap_init(void)
 219 {
 220         int err;
 221
 222         err = platform_driver_register(&physmap_flash_driver);
 223 #ifdef PHYSMAP_COMPAT
 224         if (err == 0)
 225                 platform_device_register(&physmap_flash);
 226 #endif
 227
 228         return err;
 229 }
 230
 231 static void __exit physmap_exit(void)
 232 {
 233 #ifdef PHYSMAP_COMPAT
 234         platform_device_unregister(&physmap_flash);
 235 #endif
 236         platform_driver_unregister(&physmap_flash_driver);
 237 }
 238
 239 module_init(physmap_init);
 240 module_exit(physmap_exit);
 241
 242 MODULE_LICENSE("GPL");
 243 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
 244 MODULE_DESCRIPTION("Generic configurable MTD map driver");