drivers/mtd/maps/physmap.c

   1 /*
   2  * Normal mappings of chips in physical memory
   3  *
   4  * Copyright (C) 2003 MontaVista Software Inc.
   5  * Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
   6  *
   7  * 031022 - [jsun] add run-time configure and partition setup
   8  */
   9
  10 #include <linux/module.h>
  11 #include <linux/types.h>
  12 #include <linux/kernel.h>
  13 #include <linux/init.h>
  14 #include <linux/slab.h>
  15 #include <linux/device.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/mtd/mtd.h>
  18 #include <linux/mtd/map.h>
  19 #include <linux/mtd/partitions.h>
  20 #include <linux/mtd/physmap.h>
  21 #include <linux/mtd/concat.h>
  22 #include <linux/io.h>
  23
  24 #define MAX_RESOURCES           4
  25
  26 struct physmap_flash_info {
  27         struct mtd_info         *mtd[MAX_RESOURCES];
  28         struct mtd_info         *cmtd;
  29         struct map_info         map[MAX_RESOURCES];
  30 #ifdef CONFIG_MTD_PARTITIONS
  31         int                     nr_parts;
  32         struct mtd_partition    *parts;
  33 #endif
  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         int i;
  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->cmtd) {
  50 #ifdef CONFIG_MTD_PARTITIONS
  51                 if (info->nr_parts || physmap_data->nr_parts) {
  52                         del_mtd_partitions(info->cmtd);
  53
  54                         if (info->nr_parts)
  55                                 kfree(info->parts);
  56                 } else {
  57                         del_mtd_device(info->cmtd);
  58                 }
  59 #else
  60                 del_mtd_device(info->cmtd);
  61 #endif
  62 #ifdef CONFIG_MTD_CONCAT
  63                 if (info->cmtd != info->mtd[0])
  64                         mtd_concat_destroy(info->cmtd);
  65 #endif
  66         }
  67
  68         for (i = 0; i < MAX_RESOURCES; i++) {
  69                 if (info->mtd[i] != NULL)
  70                         map_destroy(info->mtd[i]);
  71         }
  72         return 0;
  73 }
  74
  75 static const char *rom_probe_types[] = {
  76                                         "cfi_probe",
  77                                         "jedec_probe",
  78                                         "qinfo_probe",
  79                                         "map_rom",
  80                                         NULL };
  81 #ifdef CONFIG_MTD_PARTITIONS
  82 static const char *part_probe_types[] = { "cmdlinepart", "RedBoot", NULL };
  83 #endif
  84
  85 static int physmap_flash_probe(struct platform_device *dev)
  86 {
  87         struct physmap_flash_data *physmap_data;
  88         struct physmap_flash_info *info;
  89         const char **probe_type;
  90         int err = 0;
  91         int i;
  92         int devices_found = 0;
  93
  94         physmap_data = dev->dev.platform_data;
  95         if (physmap_data == NULL)
  96                 return -ENODEV;
  97
  98         info = devm_kzalloc(&dev->dev, sizeof(struct physmap_flash_info),
  99                             GFP_KERNEL);
 100         if (info == NULL) {
 101                 err = -ENOMEM;
 102                 goto err_out;
 103         }
 104
 105         platform_set_drvdata(dev, info);
 106
 107         for (i = 0; i < dev->num_resources; i++) {
 108                 printk(KERN_NOTICE "physmap platform flash device: %.8llx at %.8llx\n",
 109                        (unsigned long long)(dev->resource[i].end - dev->resource[i].start + 1),
 110                        (unsigned long long)dev->resource[i].start);
 111
 112                 if (!devm_request_mem_region(&dev->dev,
 113                         dev->resource[i].start,
 114                         dev->resource[i].end - dev->resource[i].start + 1,
 115                         dev_name(&dev->dev))) {
 116                         dev_err(&dev->dev, "Could not reserve memory region\n");
 117                         err = -ENOMEM;
 118                         goto err_out;
 119                 }
 120
 121                 info->map[i].name = dev_name(&dev->dev);
 122                 info->map[i].phys = dev->resource[i].start;
 123                 info->map[i].size = dev->resource[i].end - dev->resource[i].start + 1;
 124                 info->map[i].bankwidth = physmap_data->width;
 125                 info->map[i].set_vpp = physmap_data->set_vpp;
 126                 info->map[i].pfow_base = physmap_data->pfow_base;
 127
 128                 info->map[i].virt = devm_ioremap(&dev->dev, info->map[i].phys,
 129                                                  info->map[i].size);
 130                 if (info->map[i].virt == NULL) {
 131                         dev_err(&dev->dev, "Failed to ioremap flash region\n");
 132                         err = -EIO;
 133                         goto err_out;
 134                 }
 135
 136                 simple_map_init(&info->map[i]);
 137
 138                 probe_type = rom_probe_types;
 139                 for (; info->mtd[i] == NULL && *probe_type != NULL; probe_type++)
 140                         info->mtd[i] = do_map_probe(*probe_type, &info->map[i]);
 141                 if (info->mtd[i] == NULL) {
 142                         dev_err(&dev->dev, "map_probe failed\n");
 143                         err = -ENXIO;
 144                         goto err_out;
 145                 } else {
 146                         devices_found++;
 147                 }
 148                 info->mtd[i]->owner = THIS_MODULE;
 149                 info->mtd[i]->dev.parent = &dev->dev;
 150         }
 151
 152         if (devices_found == 1) {
 153                 info->cmtd = info->mtd[0];
 154         } else if (devices_found > 1) {
 155                 /*
 156                  * We detected multiple devices. Concatenate them together.
 157                  */
 158 #ifdef CONFIG_MTD_CONCAT
 159                 info->cmtd = mtd_concat_create(info->mtd, devices_found, dev_name(&dev->dev));
 160                 if (info->cmtd == NULL)
 161                         err = -ENXIO;
 162 #else
 163                 printk(KERN_ERR "physmap-flash: multiple devices "
 164                        "found but MTD concat support disabled.\n");
 165                 err = -ENXIO;
 166 #endif
 167         }
 168         if (err)
 169                 goto err_out;
 170
 171 #ifdef CONFIG_MTD_PARTITIONS
 172         err = parse_mtd_partitions(info->cmtd, part_probe_types,
 173                                 &info->parts, 0);
 174         if (err > 0) {
 175                 add_mtd_partitions(info->cmtd, info->parts, err);
 176                 info->nr_parts = err;
 177                 return 0;
 178         }
 179
 180         if (physmap_data->nr_parts) {
 181                 printk(KERN_NOTICE "Using physmap partition information\n");
 182                 add_mtd_partitions(info->cmtd, physmap_data->parts,
 183                                    physmap_data->nr_parts);
 184                 return 0;
 185         }
 186 #endif
 187
 188         add_mtd_device(info->cmtd);
 189         return 0;
 190
 191 err_out:
 192         physmap_flash_remove(dev);
 193         return err;
 194 }
 195
 196 #ifdef CONFIG_PM
 197 static void physmap_flash_shutdown(struct platform_device *dev)
 198 {
 199         struct physmap_flash_info *info = platform_get_drvdata(dev);
 200         int i;
 201
 202         for (i = 0; i < MAX_RESOURCES && info->mtd[i]; i++)
 203                 if (info->mtd[i]->suspend && info->mtd[i]->resume)
 204                         if (info->mtd[i]->suspend(info->mtd[i]) == 0)
 205                                 info->mtd[i]->resume(info->mtd[i]);
 206 }
 207 #else
 208 #define physmap_flash_shutdown NULL
 209 #endif
 210
 211 static struct platform_driver physmap_flash_driver = {
 212         .probe          = physmap_flash_probe,
 213         .remove         = physmap_flash_remove,
 214         .shutdown       = physmap_flash_shutdown,
 215         .driver         = {
 216                 .name   = "physmap-flash",
 217                 .owner  = THIS_MODULE,
 218         },
 219 };
 220
 221
 222 #ifdef CONFIG_MTD_PHYSMAP_COMPAT
 223 static struct physmap_flash_data physmap_flash_data = {
 224         .width          = CONFIG_MTD_PHYSMAP_BANKWIDTH,
 225 };
 226
 227 static struct resource physmap_flash_resource = {
 228         .start          = CONFIG_MTD_PHYSMAP_START,
 229         .end            = CONFIG_MTD_PHYSMAP_START + CONFIG_MTD_PHYSMAP_LEN - 1,
 230         .flags          = IORESOURCE_MEM,
 231 };
 232
 233 static struct platform_device physmap_flash = {
 234         .name           = "physmap-flash",
 235         .id             = 0,
 236         .dev            = {
 237                 .platform_data  = &physmap_flash_data,
 238         },
 239         .num_resources  = 1,
 240         .resource       = &physmap_flash_resource,
 241 };
 242
 243 void physmap_configure(unsigned long addr, unsigned long size,
 244                 int bankwidth, void (*set_vpp)(struct map_info *, int))
 245 {
 246         physmap_flash_resource.start = addr;
 247         physmap_flash_resource.end = addr + size - 1;
 248         physmap_flash_data.width = bankwidth;
 249         physmap_flash_data.set_vpp = set_vpp;
 250 }
 251
 252 #ifdef CONFIG_MTD_PARTITIONS
 253 void physmap_set_partitions(struct mtd_partition *parts, int num_parts)
 254 {
 255         physmap_flash_data.nr_parts = num_parts;
 256         physmap_flash_data.parts = parts;
 257 }
 258 #endif
 259 #endif
 260
 261 static int __init physmap_init(void)
 262 {
 263         int err;
 264
 265         err = platform_driver_register(&physmap_flash_driver);
 266 #ifdef CONFIG_MTD_PHYSMAP_COMPAT
 267         if (err == 0)
 268                 platform_device_register(&physmap_flash);
 269 #endif
 270
 271         return err;
 272 }
 273
 274 static void __exit physmap_exit(void)
 275 {
 276 #ifdef CONFIG_MTD_PHYSMAP_COMPAT
 277         platform_device_unregister(&physmap_flash);
 278 #endif
 279         platform_driver_unregister(&physmap_flash_driver);
 280 }
 281
 282 module_init(physmap_init);
 283 module_exit(physmap_exit);
 284
 285 MODULE_LICENSE("GPL");
 286 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
 287 MODULE_DESCRIPTION("Generic configurable MTD map driver");
 288
 289 /* legacy platform drivers can't hotplug or coldplg */
 290 #ifndef CONFIG_MTD_PHYSMAP_COMPAT
 291 /* work with hotplug and coldplug */
 292 MODULE_ALIAS("platform:physmap-flash");
 293 #endif