target/linux/adm5120/files-2.6.26/drivers/mtd/maps/adm5120-flash.c

   1 /*
   2  *  Platform driver for NOR flash devices on ADM5120 based boards
   3  *
   4  *  Copyright (C) 2007-2008 Gabor Juhos <juhosg@openwrt.org>
   5  *
   6  *  This file was derived from: drivers/mtd/map/physmap.c
   7  *      Copyright (C) 2003 MontaVista Software Inc.
   8  *      Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
   9  *
  10  *  This program is free software; you can redistribute it and/or modify it
  11  *  under the terms of the GNU General Public License version 2 as published
  12  *  by the Free Software Foundation.
  13  *
  14  */
  15
  16 #include <linux/module.h>
  17 #include <linux/types.h>
  18 #include <linux/kernel.h>
  19 #include <linux/init.h>
  20 #include <linux/slab.h>
  21 #include <linux/io.h>
  22 #include <linux/device.h>
  23 #include <linux/platform_device.h>
  24
  25 #include <linux/mtd/mtd.h>
  26 #include <linux/mtd/map.h>
  27 #include <linux/mtd/partitions.h>
  28
  29 #include <asm/mach-adm5120/adm5120_defs.h>
  30 #include <asm/mach-adm5120/adm5120_switch.h>
  31 #include <asm/mach-adm5120/adm5120_mpmc.h>
  32 #include <asm/mach-adm5120/adm5120_platform.h>
  33
  34 #define DRV_NAME        "adm5120-flash"
  35 #define DRV_DESC        "ADM5120 flash MAP driver"
  36 #define MAX_PARSED_PARTS 8
  37
  38 #ifdef ADM5120_FLASH_DEBUG
  39 #define MAP_DBG(m, f, a...)     printk(KERN_INFO "%s: " f, (m->name) , ## a)
  40 #else
  41 #define MAP_DBG(m, f, a...)     do {} while (0)
  42 #endif
  43 #define MAP_ERR(m, f, a...)     printk(KERN_ERR "%s: " f, (m->name) , ## a)
  44 #define MAP_INFO(m, f, a...)    printk(KERN_INFO "%s: " f, (m->name) , ## a)
  45
  46 struct adm5120_map_info {
  47         struct map_info map;
  48         void            (*switch_bank)(unsigned);
  49         unsigned long   window_size;
  50 };
  51
  52 struct adm5120_flash_info {
  53         struct mtd_info         *mtd;
  54         struct resource         *res;
  55         struct platform_device  *dev;
  56         struct adm5120_map_info amap;
  57 #ifdef CONFIG_MTD_PARTITIONS
  58         int                     nr_parts;
  59         struct mtd_partition    *parts[MAX_PARSED_PARTS];
  60 #endif
  61 };
  62
  63 struct flash_desc {
  64         u32     phys;
  65         u32     srs_shift;
  66 };
  67
  68 /*
  69  * Globals
  70  */
  71 static DEFINE_SPINLOCK(adm5120_flash_spin);
  72 #define FLASH_LOCK()    spin_lock(&adm5120_flash_spin)
  73 #define FLASH_UNLOCK()  spin_unlock(&adm5120_flash_spin)
  74
  75 static u32 flash_bankwidths[4] = { 1, 2, 4, 0 };
  76
  77 static u32 flash_sizes[8] = {
  78         0, 512*1024, 1024*1024, 2*1024*1024,
  79         4*1024*1024, 0, 0, 0
  80 };
  81
  82 static struct flash_desc flash_descs[2] = {
  83         {
  84                 .phys           = ADM5120_SRAM0_BASE,
  85                 .srs_shift      = MEMCTRL_SRS0_SHIFT,
  86         }, {
  87                 .phys           = ADM5120_SRAM1_BASE,
  88                 .srs_shift      = MEMCTRL_SRS1_SHIFT,
  89         }
  90 };
  91
  92 static const char *probe_types[] = {
  93         "cfi_probe",
  94         "jedec_probe",
  95         "map_rom",
  96         NULL
  97 };
  98
  99 #ifdef CONFIG_MTD_PARTITIONS
 100 static const char *parse_types[] = {
 101         "cmdlinepart",
 102 #ifdef CONFIG_MTD_REDBOOT_PARTS
 103         "RedBoot",
 104 #endif
 105 #ifdef CONFIG_MTD_MYLOADER_PARTS
 106         "MyLoader",
 107 #endif
 108 };
 109 #endif
 110
 111 #define BANK_SIZE       (2<<20)
 112 #define BANK_SIZE_MAX   (4<<20)
 113 #define BANK_OFFS_MASK  (BANK_SIZE-1)
 114 #define BANK_START_MASK (~BANK_OFFS_MASK)
 115
 116 static inline struct adm5120_map_info *map_to_amap(struct map_info *map)
 117 {
 118         return (struct adm5120_map_info *)map;
 119 }
 120
 121 static void adm5120_flash_switchbank(struct map_info *map,
 122                 unsigned long ofs)
 123 {
 124         struct adm5120_map_info *amap = map_to_amap(map);
 125         unsigned bank;
 126
 127         if (amap->switch_bank == NULL)
 128                 return;
 129
 130         bank = (ofs & BANK_START_MASK) >> 21;
 131         if (bank > 1)
 132                 BUG();
 133
 134         MAP_DBG(map, "switching to bank %u, ofs=%lX\n", bank, ofs);
 135         amap->switch_bank(bank);
 136 }
 137
 138 static map_word adm5120_flash_read(struct map_info *map, unsigned long ofs)
 139 {
 140         struct adm5120_map_info *amap = map_to_amap(map);
 141         map_word ret;
 142
 143         MAP_DBG(map, "reading from ofs %lX\n", ofs);
 144
 145         if (ofs >= amap->window_size)
 146                 return map_word_ff(map);
 147
 148         FLASH_LOCK();
 149         adm5120_flash_switchbank(map, ofs);
 150         ret = inline_map_read(map, (ofs & (amap->window_size-1)));
 151         FLASH_UNLOCK();
 152
 153         return ret;
 154 }
 155
 156 static void adm5120_flash_write(struct map_info *map, const map_word datum,
 157                 unsigned long ofs)
 158 {
 159         struct adm5120_map_info *amap = map_to_amap(map);
 160
 161         MAP_DBG(map, "writing to ofs %lX\n", ofs);
 162
 163         if (ofs > amap->window_size)
 164                 return;
 165
 166         FLASH_LOCK();
 167         adm5120_flash_switchbank(map, ofs);
 168         inline_map_write(map, datum, (ofs & (amap->window_size-1)));
 169         FLASH_UNLOCK();
 170 }
 171
 172 static void adm5120_flash_copy_from(struct map_info *map, void *to,
 173                 unsigned long from, ssize_t len)
 174 {
 175         struct adm5120_map_info *amap = map_to_amap(map);
 176         char *p;
 177         ssize_t t;
 178
 179         MAP_DBG(map, "copy_from, to=%lX, from=%lX, len=%lX\n",
 180                 (unsigned long)to, from, (unsigned long)len);
 181
 182         if (from > amap->window_size)
 183                 return;
 184
 185         p = (char *)to;
 186         while (len > 0) {
 187                 t = len;
 188                 if ((from < BANK_SIZE) && ((from+len) > BANK_SIZE))
 189                         t = BANK_SIZE-from;
 190
 191                 FLASH_LOCK();
 192                 MAP_DBG(map, "copying %lu byte(s) from %lX to %lX\n",
 193                         (unsigned long)t, (from & (amap->window_size-1)),
 194                         (unsigned long)p);
 195                 adm5120_flash_switchbank(map, from);
 196                 inline_map_copy_from(map, p, (from & (amap->window_size-1)), t);
 197                 FLASH_UNLOCK();
 198                 p += t;
 199                 from += t;
 200                 len -= t;
 201         }
 202 }
 203
 204 static int adm5120_flash_initres(struct adm5120_flash_info *info)
 205 {
 206         struct map_info *map = &info->amap.map;
 207         int err = 0;
 208
 209         info->res = request_mem_region(map->phys, info->amap.window_size,
 210                         map->name);
 211         if (info->res == NULL) {
 212                 MAP_ERR(map, "could not reserve memory region\n");
 213                 err = -ENOMEM;
 214                 goto out;
 215         }
 216
 217         map->virt = ioremap_nocache(map->phys, info->amap.window_size);
 218         if (map->virt == NULL) {
 219                 MAP_ERR(map, "failed to ioremap flash region\n");
 220                 err = -ENOMEM;
 221                 goto out;
 222         }
 223
 224 out:
 225         return err;
 226 }
 227
 228 static int adm5120_flash_initinfo(struct adm5120_flash_info *info,
 229                 struct platform_device *dev)
 230 {
 231         struct map_info *map = &info->amap.map;
 232         struct adm5120_flash_platform_data *pdata = dev->dev.platform_data;
 233         struct flash_desc *fdesc;
 234         u32 t = 0;
 235
 236         map->name = dev->dev.bus_id;
 237
 238         if (dev->id > 1) {
 239                 MAP_ERR(map, "invalid flash id\n");
 240                 goto err_out;
 241         }
 242
 243         fdesc = &flash_descs[dev->id];
 244
 245         if (pdata)
 246                 info->amap.window_size = pdata->window_size;
 247
 248         if (info->amap.window_size == 0) {
 249                 /* get memory window size */
 250                 t = SW_READ_REG(SWITCH_REG_MEMCTRL) >> fdesc->srs_shift;
 251                 t &= MEMCTRL_SRS_MASK;
 252                 info->amap.window_size = flash_sizes[t];
 253         }
 254
 255         if (info->amap.window_size == 0) {
 256                 MAP_ERR(map, "unable to determine window size\n");
 257                 goto err_out;
 258         }
 259
 260         /* get flash bus width */
 261         switch (dev->id) {
 262         case 0:
 263                 t = MPMC_READ_REG(SC1) & SC_MW_MASK;
 264                 break;
 265         case 1:
 266                 t = MPMC_READ_REG(SC0) & SC_MW_MASK;
 267                 break;
 268         }
 269         map->bankwidth = flash_bankwidths[t];
 270         if (map->bankwidth == 0) {
 271                 MAP_ERR(map, "invalid bus width detected\n");
 272                 goto err_out;
 273         }
 274
 275         map->phys = fdesc->phys;
 276         map->size = BANK_SIZE_MAX;
 277
 278         simple_map_init(map);
 279         map->read = adm5120_flash_read;
 280         map->write = adm5120_flash_write;
 281         map->copy_from = adm5120_flash_copy_from;
 282
 283         if (pdata) {
 284                 map->set_vpp = pdata->set_vpp;
 285                 info->amap.switch_bank = pdata->switch_bank;
 286         }
 287
 288         info->dev = dev;
 289
 290         MAP_INFO(map, "probing at 0x%lX, size:%ldKiB, width:%d bits\n",
 291                 (unsigned long)map->phys,
 292                 (unsigned long)info->amap.window_size >> 10,
 293                 map->bankwidth*8);
 294
 295         return 0;
 296
 297 err_out:
 298         return -ENODEV;
 299 }
 300
 301 static void adm5120_flash_initbanks(struct adm5120_flash_info *info)
 302 {
 303         struct map_info *map = &info->amap.map;
 304
 305         if (info->mtd->size <= BANK_SIZE)
 306                 /* no bank switching needed */
 307                 return;
 308
 309         if (info->amap.switch_bank) {
 310                 info->amap.window_size = info->mtd->size;
 311                 return;
 312         }
 313
 314         MAP_ERR(map, "reduce visibility from %ldKiB to %ldKiB\n",
 315                 (unsigned long)map->size >> 10,
 316                 (unsigned long)info->mtd->size >> 10);
 317
 318         info->mtd->size = info->amap.window_size;
 319 }
 320
 321 #ifdef CONFIG_MTD_PARTITIONS
 322 static int adm5120_flash_initparts(struct adm5120_flash_info *info)
 323 {
 324         struct adm5120_flash_platform_data *pdata;
 325         struct map_info *map = &info->amap.map;
 326         int num_parsers;
 327         const char *parser[2];
 328         int err = 0;
 329         int nr_parts;
 330         int i;
 331
 332         info->nr_parts = 0;
 333
 334         pdata = info->dev->dev.platform_data;
 335         if (pdata == NULL)
 336                 goto out;
 337
 338         if (pdata->nr_parts) {
 339                 MAP_INFO(map, "adding static partitions\n");
 340                 err = add_mtd_partitions(info->mtd, pdata->parts,
 341                         pdata->nr_parts);
 342                 if (err == 0) {
 343                         info->nr_parts += pdata->nr_parts;
 344                         goto out;
 345                 }
 346         }
 347
 348         num_parsers = ARRAY_SIZE(parse_types);
 349         if (num_parsers > MAX_PARSED_PARTS)
 350                 num_parsers = MAX_PARSED_PARTS;
 351
 352         parser[1] = NULL;
 353         for (i = 0; i < num_parsers; i++) {
 354                 parser[0] = parse_types[i];
 355
 356                 MAP_INFO(map, "parsing \"%s\" partitions\n",
 357                         parser[0]);
 358                 nr_parts = parse_mtd_partitions(info->mtd, parser,
 359                         &info->parts[i], 0);
 360
 361                 if (nr_parts <= 0)
 362                         continue;
 363
 364                 MAP_INFO(map, "adding \"%s\" partitions\n",
 365                         parser[0]);
 366
 367                 err = add_mtd_partitions(info->mtd, info->parts[i], nr_parts);
 368                 if (err)
 369                         break;
 370
 371                 info->nr_parts += nr_parts;
 372         }
 373 out:
 374         return err;
 375 }
 376 #else
 377 static int adm5120_flash_initparts(struct adm5120_flash_info *info)
 378 {
 379         return 0;
 380 }
 381 #endif /* CONFIG_MTD_PARTITIONS */
 382
 383 #ifdef CONFIG_MTD_PARTITIONS
 384 static void adm5120_flash_remove_mtd(struct adm5120_flash_info *info)
 385 {
 386         int i;
 387
 388         if (info->nr_parts) {
 389                 del_mtd_partitions(info->mtd);
 390                 for (i = 0; i < MAX_PARSED_PARTS; i++)
 391                         if (info->parts[i] != NULL)
 392                                 kfree(info->parts[i]);
 393         } else {
 394                 del_mtd_device(info->mtd);
 395         }
 396 }
 397 #else
 398 static void adm5120_flash_remove_mtd(struct adm5120_flash_info *info)
 399 {
 400         del_mtd_device(info->mtd);
 401 }
 402 #endif
 403
 404 static int adm5120_flash_remove(struct platform_device *dev)
 405 {
 406         struct adm5120_flash_info *info;
 407
 408         info = platform_get_drvdata(dev);
 409         if (info == NULL)
 410                 return 0;
 411
 412         platform_set_drvdata(dev, NULL);
 413
 414         if (info->mtd != NULL) {
 415                 adm5120_flash_remove_mtd(info);
 416                 map_destroy(info->mtd);
 417         }
 418
 419         if (info->amap.map.virt != NULL)
 420                 iounmap(info->amap.map.virt);
 421
 422         if (info->res != NULL) {
 423                 release_resource(info->res);
 424                 kfree(info->res);
 425         }
 426
 427         return 0;
 428 }
 429
 430 static int adm5120_flash_probe(struct platform_device *dev)
 431 {
 432         struct adm5120_flash_info *info;
 433         struct map_info *map;
 434         const char **probe_type;
 435         int err;
 436
 437         info = kzalloc(sizeof(*info), GFP_KERNEL);
 438         if (info == NULL) {
 439                 err = -ENOMEM;
 440                 goto err_out;
 441         }
 442
 443         platform_set_drvdata(dev, info);
 444
 445         err = adm5120_flash_initinfo(info, dev);
 446         if (err)
 447                 goto err_out;
 448
 449         err = adm5120_flash_initres(info);
 450         if (err)
 451                 goto err_out;
 452
 453         map = &info->amap.map;
 454         for (probe_type = probe_types; info->mtd == NULL && *probe_type != NULL;
 455                 probe_type++)
 456                 info->mtd = do_map_probe(*probe_type, map);
 457
 458         if (info->mtd == NULL) {
 459                 MAP_ERR(map, "map_probe failed\n");
 460                 err = -ENXIO;
 461                 goto err_out;
 462         }
 463
 464         adm5120_flash_initbanks(info);
 465
 466         if (info->mtd->size < info->amap.window_size) {
 467                 /* readjust resources */
 468                 iounmap(map->virt);
 469                 release_resource(info->res);
 470                 kfree(info->res);
 471
 472                 info->amap.window_size = info->mtd->size;
 473                 map->size = info->mtd->size;
 474                 MAP_INFO(map, "reducing map size to %ldKiB\n",
 475                         (unsigned long)map->size >> 10);
 476                 err = adm5120_flash_initres(info);
 477                 if (err)
 478                         goto err_out;
 479         }
 480
 481         MAP_INFO(map, "found at 0x%lX, size:%ldKiB, width:%d bits\n",
 482                 (unsigned long)map->phys, (unsigned long)info->mtd->size >> 10,
 483                 map->bankwidth*8);
 484
 485         info->mtd->owner = THIS_MODULE;
 486
 487         err = adm5120_flash_initparts(info);
 488         if (err)
 489                 goto err_out;
 490
 491         if (info->nr_parts == 0) {
 492                 MAP_INFO(map, "no partitions available, registering "
 493                         "whole flash\n");
 494                 add_mtd_device(info->mtd);
 495         }
 496
 497         return 0;
 498
 499 err_out:
 500         adm5120_flash_remove(dev);
 501         return err;
 502 }
 503
 504 #ifdef CONFIG_PM
 505 static int adm5120_flash_suspend(struct platform_device *dev,
 506                 pm_message_t state)
 507 {
 508         struct adm5120_flash_info *info = platform_get_drvdata(dev);
 509         int ret = 0;
 510
 511         if (info)
 512                 ret = info->mtd->suspend(info->mtd);
 513
 514         return ret;
 515 }
 516
 517 static int adm5120_flash_resume(struct platform_device *dev)
 518 {
 519         struct adm5120_flash_info *info = platform_get_drvdata(dev);
 520
 521         if (info)
 522                 info->mtd->resume(info->mtd);
 523
 524         return 0;
 525 }
 526
 527 static void adm5120_flash_shutdown(struct platform_device *dev)
 528 {
 529         struct adm5120_flash_info *info = platform_get_drvdata(dev);
 530
 531         if (info && info->mtd->suspend(info->mtd) == 0)
 532                 info->mtd->resume(info->mtd);
 533 }
 534 #endif
 535
 536 static struct platform_driver adm5120_flash_driver = {
 537         .probe          = adm5120_flash_probe,
 538         .remove         = adm5120_flash_remove,
 539 #ifdef CONFIG_PM
 540         .suspend        = adm5120_flash_suspend,
 541         .resume         = adm5120_flash_resume,
 542         .shutdown       = adm5120_flash_shutdown,
 543 #endif
 544         .driver         = {
 545                 .name   = DRV_NAME,
 546         },
 547 };
 548
 549 static int __init adm5120_flash_init(void)
 550 {
 551         int err;
 552
 553         err = platform_driver_register(&adm5120_flash_driver);
 554
 555         return err;
 556 }
 557
 558 static void __exit adm5120_flash_exit(void)
 559 {
 560         platform_driver_unregister(&adm5120_flash_driver);
 561 }
 562
 563 module_init(adm5120_flash_init);
 564 module_exit(adm5120_flash_exit);
 565
 566 MODULE_LICENSE("GPL v2");
 567 MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
 568 MODULE_DESCRIPTION(DRV_DESC);