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         spinlock_t              vpp_lock;
  31         int                     vpp_refcnt;
  32 };
  33
  34 static int physmap_flash_remove(struct platform_device *dev)
  35 {
  36         struct physmap_flash_info *info;
  37         struct physmap_flash_data *physmap_data;
  38         int i;
  39
  40         info = platform_get_drvdata(dev);
  41         if (info == NULL)
  42                 return 0;
  43         platform_set_drvdata(dev, NULL);
  44
  45         physmap_data = dev->dev.platform_data;
  46
  47         if (info->cmtd) {
  48                 mtd_device_unregister(info->cmtd);
  49                 if (info->cmtd != info->mtd[0])
  50                         mtd_concat_destroy(info->cmtd);
  51         }
  52
  53         for (i = 0; i < MAX_RESOURCES; i++) {
  54                 if (info->mtd[i] != NULL)
  55                         map_destroy(info->mtd[i]);
  56         }
  57
  58         if (physmap_data->exit)
  59                 physmap_data->exit(dev);
  60
  61         return 0;
  62 }
  63
  64 static void physmap_set_vpp(struct map_info *map, int state)
  65 {
  66         struct platform_device *pdev;
  67         struct physmap_flash_data *physmap_data;
  68         struct physmap_flash_info *info;
  69         unsigned long flags;
  70
  71         pdev = (struct platform_device *)map->map_priv_1;
  72         physmap_data = pdev->dev.platform_data;
  73
  74         if (!physmap_data->set_vpp)
  75                 return;
  76
  77         info = platform_get_drvdata(pdev);
  78
  79         spin_lock_irqsave(&info->vpp_lock, flags);
  80         if (state) {
  81                 if (++info->vpp_refcnt == 1)    /* first nested 'on' */
  82                         physmap_data->set_vpp(pdev, 1);
  83         } else {
  84                 if (--info->vpp_refcnt == 0)    /* last nested 'off' */
  85                         physmap_data->set_vpp(pdev, 0);
  86         }
  87         spin_unlock_irqrestore(&info->vpp_lock, flags);
  88 }
  89
  90 static const char * const rom_probe_types[] = {
  91         "cfi_probe", "jedec_probe", "qinfo_probe", "map_rom", NULL };
  92
  93 static const char * const part_probe_types[] = {
  94         "cmdlinepart", "RedBoot", "afs", NULL };
  95
  96 static int physmap_flash_probe(struct platform_device *dev)
  97 {
  98         struct physmap_flash_data *physmap_data;
  99         struct physmap_flash_info *info;
 100         const char * const *probe_type;
 101         const char * const *part_types;
 102         int err = 0;
 103         int i;
 104         int devices_found = 0;
 105
 106         physmap_data = dev->dev.platform_data;
 107         if (physmap_data == NULL)
 108                 return -ENODEV;
 109
 110         info = devm_kzalloc(&dev->dev, sizeof(struct physmap_flash_info),
 111                             GFP_KERNEL);
 112         if (info == NULL) {
 113                 err = -ENOMEM;
 114                 goto err_out;
 115         }
 116
 117         if (physmap_data->init) {
 118                 err = physmap_data->init(dev);
 119                 if (err)
 120                         goto err_out;
 121         }
 122
 123         platform_set_drvdata(dev, info);
 124
 125         for (i = 0; i < dev->num_resources; i++) {
 126                 printk(KERN_NOTICE "physmap platform flash device: %.8llx at %.8llx\n",
 127                        (unsigned long long)resource_size(&dev->resource[i]),
 128                        (unsigned long long)dev->resource[i].start);
 129
 130                 if (!devm_request_mem_region(&dev->dev,
 131                         dev->resource[i].start,
 132                         resource_size(&dev->resource[i]),
 133                         dev_name(&dev->dev))) {
 134                         dev_err(&dev->dev, "Could not reserve memory region\n");
 135                         err = -ENOMEM;
 136                         goto err_out;
 137                 }
 138
 139                 info->map[i].name = dev_name(&dev->dev);
 140                 info->map[i].phys = dev->resource[i].start;
 141                 info->map[i].size = resource_size(&dev->resource[i]);
 142                 info->map[i].bankwidth = physmap_data->width;
 143                 info->map[i].set_vpp = physmap_set_vpp;
 144                 info->map[i].pfow_base = physmap_data->pfow_base;
 145                 info->map[i].map_priv_1 = (unsigned long)dev;
 146
 147                 info->map[i].virt = devm_ioremap(&dev->dev, info->map[i].phys,
 148                                                  info->map[i].size);
 149                 if (info->map[i].virt == NULL) {
 150                         dev_err(&dev->dev, "Failed to ioremap flash region\n");
 151                         err = -EIO;
 152                         goto err_out;
 153                 }
 154
 155                 simple_map_init(&info->map[i]);
 156
 157                 probe_type = rom_probe_types;
 158                 if (physmap_data->probe_type == NULL) {
 159                         for (; info->mtd[i] == NULL && *probe_type != NULL; probe_type++)
 160                                 info->mtd[i] = do_map_probe(*probe_type, &info->map[i]);
 161                 } else
 162                         info->mtd[i] = do_map_probe(physmap_data->probe_type, &info->map[i]);
 163
 164                 if (info->mtd[i] == NULL) {
 165                         dev_err(&dev->dev, "map_probe failed\n");
 166                         err = -ENXIO;
 167                         goto err_out;
 168                 } else {
 169                         devices_found++;
 170                 }
 171                 info->mtd[i]->owner = THIS_MODULE;
 172                 info->mtd[i]->dev.parent = &dev->dev;
 173         }
 174
 175         if (devices_found == 1) {
 176                 info->cmtd = info->mtd[0];
 177         } else if (devices_found > 1) {
 178                 /*
 179                  * We detected multiple devices. Concatenate them together.
 180                  */
 181                 info->cmtd = mtd_concat_create(info->mtd, devices_found, dev_name(&dev->dev));
 182                 if (info->cmtd == NULL)
 183                         err = -ENXIO;
 184         }
 185         if (err)
 186                 goto err_out;
 187
 188         spin_lock_init(&info->vpp_lock);
 189
 190         part_types = physmap_data->part_probe_types ? : part_probe_types;
 191
 192         mtd_device_parse_register(info->cmtd, part_types, NULL,
 193                                   physmap_data->parts, physmap_data->nr_parts);
 194         return 0;
 195
 196 err_out:
 197         physmap_flash_remove(dev);
 198         return err;
 199 }
 200
 201 #ifdef CONFIG_PM
 202 static void physmap_flash_shutdown(struct platform_device *dev)
 203 {
 204         struct physmap_flash_info *info = platform_get_drvdata(dev);
 205         int i;
 206
 207         for (i = 0; i < MAX_RESOURCES && info->mtd[i]; i++)
 208                 if (mtd_suspend(info->mtd[i]) == 0)
 209                         mtd_resume(info->mtd[i]);
 210 }
 211 #else
 212 #define physmap_flash_shutdown NULL
 213 #endif
 214
 215 static struct platform_driver physmap_flash_driver = {
 216         .probe          = physmap_flash_probe,
 217         .remove         = physmap_flash_remove,
 218         .shutdown       = physmap_flash_shutdown,
 219         .driver         = {
 220                 .name   = "physmap-flash",
 221                 .owner  = THIS_MODULE,
 222         },
 223 };
 224
 225
 226 #ifdef CONFIG_MTD_PHYSMAP_COMPAT
 227 static struct physmap_flash_data physmap_flash_data = {
 228         .width          = CONFIG_MTD_PHYSMAP_BANKWIDTH,
 229 };
 230
 231 static struct resource physmap_flash_resource = {
 232         .start          = CONFIG_MTD_PHYSMAP_START,
 233         .end            = CONFIG_MTD_PHYSMAP_START + CONFIG_MTD_PHYSMAP_LEN - 1,
 234         .flags          = IORESOURCE_MEM,
 235 };
 236
 237 static struct platform_device physmap_flash = {
 238         .name           = "physmap-flash",
 239         .id             = 0,
 240         .dev            = {
 241                 .platform_data  = &physmap_flash_data,
 242         },
 243         .num_resources  = 1,
 244         .resource       = &physmap_flash_resource,
 245 };
 246 #endif
 247
 248 static int __init physmap_init(void)
 249 {
 250         int err;
 251
 252         err = platform_driver_register(&physmap_flash_driver);
 253 #ifdef CONFIG_MTD_PHYSMAP_COMPAT
 254         if (err == 0) {
 255                 err = platform_device_register(&physmap_flash);
 256                 if (err)
 257                         platform_driver_unregister(&physmap_flash_driver);
 258         }
 259 #endif
 260
 261         return err;
 262 }
 263
 264 static void __exit physmap_exit(void)
 265 {
 266 #ifdef CONFIG_MTD_PHYSMAP_COMPAT
 267         platform_device_unregister(&physmap_flash);
 268 #endif
 269         platform_driver_unregister(&physmap_flash_driver);
 270 }
 271
 272 module_init(physmap_init);
 273 module_exit(physmap_exit);
 274
 275 MODULE_LICENSE("GPL");
 276 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
 277 MODULE_DESCRIPTION("Generic configurable MTD map driver");
 278
 279 /* legacy platform drivers can't hotplug or coldplg */
 280 #ifndef CONFIG_MTD_PHYSMAP_COMPAT
 281 /* work with hotplug and coldplug */
 282 MODULE_ALIAS("platform:physmap-flash");
 283 #endif