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         const char **part_types;
  89         int err = 0;
  90         int i;
  91         int devices_found = 0;
  92
  93         physmap_data = dev->dev.platform_data;
  94         if (physmap_data == NULL)
  95                 return -ENODEV;
  96
  97         info = devm_kzalloc(&dev->dev, sizeof(struct physmap_flash_info),
  98                             GFP_KERNEL);
  99         if (info == NULL) {
 100                 err = -ENOMEM;
 101                 goto err_out;
 102         }
 103
 104         if (physmap_data->init) {
 105                 err = physmap_data->init(dev);
 106                 if (err)
 107                         goto err_out;
 108         }
 109
 110         platform_set_drvdata(dev, info);
 111
 112         for (i = 0; i < dev->num_resources; i++) {
 113                 printk(KERN_NOTICE "physmap platform flash device: %.8llx at %.8llx\n",
 114                        (unsigned long long)resource_size(&dev->resource[i]),
 115                        (unsigned long long)dev->resource[i].start);
 116
 117                 if (!devm_request_mem_region(&dev->dev,
 118                         dev->resource[i].start,
 119                         resource_size(&dev->resource[i]),
 120                         dev_name(&dev->dev))) {
 121                         dev_err(&dev->dev, "Could not reserve memory region\n");
 122                         err = -ENOMEM;
 123                         goto err_out;
 124                 }
 125
 126                 info->map[i].name = dev_name(&dev->dev);
 127                 info->map[i].phys = dev->resource[i].start;
 128                 info->map[i].size = resource_size(&dev->resource[i]);
 129                 info->map[i].bankwidth = physmap_data->width;
 130                 info->map[i].set_vpp = physmap_set_vpp;
 131                 info->map[i].pfow_base = physmap_data->pfow_base;
 132                 info->map[i].map_priv_1 = (unsigned long)dev;
 133
 134                 info->map[i].virt = devm_ioremap(&dev->dev, info->map[i].phys,
 135                                                  info->map[i].size);
 136                 if (info->map[i].virt == NULL) {
 137                         dev_err(&dev->dev, "Failed to ioremap flash region\n");
 138                         err = -EIO;
 139                         goto err_out;
 140                 }
 141
 142                 simple_map_init(&info->map[i]);
 143
 144                 probe_type = rom_probe_types;
 145                 if (physmap_data->probe_type == NULL) {
 146                         for (; info->mtd[i] == NULL && *probe_type != NULL; probe_type++)
 147                                 info->mtd[i] = do_map_probe(*probe_type, &info->map[i]);
 148                 } else
 149                         info->mtd[i] = do_map_probe(physmap_data->probe_type, &info->map[i]);
 150
 151                 if (info->mtd[i] == NULL) {
 152                         dev_err(&dev->dev, "map_probe failed\n");
 153                         err = -ENXIO;
 154                         goto err_out;
 155                 } else {
 156                         devices_found++;
 157                 }
 158                 info->mtd[i]->owner = THIS_MODULE;
 159                 info->mtd[i]->dev.parent = &dev->dev;
 160         }
 161
 162         if (devices_found == 1) {
 163                 info->cmtd = info->mtd[0];
 164         } else if (devices_found > 1) {
 165                 /*
 166                  * We detected multiple devices. Concatenate them together.
 167                  */
 168                 info->cmtd = mtd_concat_create(info->mtd, devices_found, dev_name(&dev->dev));
 169                 if (info->cmtd == NULL)
 170                         err = -ENXIO;
 171         }
 172         if (err)
 173                 goto err_out;
 174
 175         part_types = physmap_data->part_probe_types ? : part_probe_types;
 176
 177         mtd_device_parse_register(info->cmtd, part_types, 0,
 178                                   physmap_data->parts, physmap_data->nr_parts);
 179         return 0;
 180
 181 err_out:
 182         physmap_flash_remove(dev);
 183         return err;
 184 }
 185
 186 #ifdef CONFIG_PM
 187 static void physmap_flash_shutdown(struct platform_device *dev)
 188 {
 189         struct physmap_flash_info *info = platform_get_drvdata(dev);
 190         int i;
 191
 192         for (i = 0; i < MAX_RESOURCES && info->mtd[i]; i++)
 193                 if (mtd_suspend(info->mtd[i]) == 0)
 194                         mtd_resume(info->mtd[i]);
 195 }
 196 #else
 197 #define physmap_flash_shutdown NULL
 198 #endif
 199
 200 static struct platform_driver physmap_flash_driver = {
 201         .probe          = physmap_flash_probe,
 202         .remove         = physmap_flash_remove,
 203         .shutdown       = physmap_flash_shutdown,
 204         .driver         = {
 205                 .name   = "physmap-flash",
 206                 .owner  = THIS_MODULE,
 207         },
 208 };
 209
 210
 211 #ifdef CONFIG_MTD_PHYSMAP_COMPAT
 212 static struct physmap_flash_data physmap_flash_data = {
 213         .width          = CONFIG_MTD_PHYSMAP_BANKWIDTH,
 214 };
 215
 216 static struct resource physmap_flash_resource = {
 217         .start          = CONFIG_MTD_PHYSMAP_START,
 218         .end            = CONFIG_MTD_PHYSMAP_START + CONFIG_MTD_PHYSMAP_LEN - 1,
 219         .flags          = IORESOURCE_MEM,
 220 };
 221
 222 static struct platform_device physmap_flash = {
 223         .name           = "physmap-flash",
 224         .id             = 0,
 225         .dev            = {
 226                 .platform_data  = &physmap_flash_data,
 227         },
 228         .num_resources  = 1,
 229         .resource       = &physmap_flash_resource,
 230 };
 231 #endif
 232
 233 static int __init physmap_init(void)
 234 {
 235         int err;
 236
 237         err = platform_driver_register(&physmap_flash_driver);
 238 #ifdef CONFIG_MTD_PHYSMAP_COMPAT
 239         if (err == 0) {
 240                 err = platform_device_register(&physmap_flash);
 241                 if (err)
 242                         platform_driver_unregister(&physmap_flash_driver);
 243         }
 244 #endif
 245
 246         return err;
 247 }
 248
 249 static void __exit physmap_exit(void)
 250 {
 251 #ifdef CONFIG_MTD_PHYSMAP_COMPAT
 252         platform_device_unregister(&physmap_flash);
 253 #endif
 254         platform_driver_unregister(&physmap_flash_driver);
 255 }
 256
 257 module_init(physmap_init);
 258 module_exit(physmap_exit);
 259
 260 MODULE_LICENSE("GPL");
 261 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
 262 MODULE_DESCRIPTION("Generic configurable MTD map driver");
 263
 264 /* legacy platform drivers can't hotplug or coldplg */
 265 #ifndef CONFIG_MTD_PHYSMAP_COMPAT
 266 /* work with hotplug and coldplug */
 267 MODULE_ALIAS("platform:physmap-flash");
 268 #endif