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