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