drivers/mtd/nand/raw/diskonchip.c

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This source file includes following definitions.
doc_ecc_decode
DoC_Delay
_DoC_WaitReady
DoC_WaitReady
doc2000_write_byte
doc2000_read_byte
doc2000_writebuf
doc2000_readbuf
doc2000_readbuf_dword
doc200x_ident_chip
doc2000_count_chips
doc200x_wait
doc2001_write_byte
doc2001_read_byte
doc2001_writebuf
doc2001_readbuf
doc2001plus_read_byte
doc2001plus_writebuf
doc2001plus_readbuf
doc2001plus_select_chip
doc200x_select_chip
doc200x_hwcontrol
doc2001plus_command
doc200x_dev_ready
doc200x_block_bad
doc200x_enable_hwecc
doc2001plus_enable_hwecc
doc200x_calculate_ecc
doc200x_correct_data
doc200x_ooblayout_ecc
doc200x_ooblayout_free
find_media_headers
nftl_partscan
inftl_partscan
nftl_scan_bbt
inftl_scan_bbt
doc2000_init
doc2001_init
doc2001plus_init
doc_probe
release_nanddoc
init_nanddoc
cleanup_nanddoc
   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * (C) 2003 Red Hat, Inc.
   4  * (C) 2004 Dan Brown <dan_brown@ieee.org>
   5  * (C) 2004 Kalev Lember <kalev@smartlink.ee>
   6  *
   7  * Author: David Woodhouse <dwmw2@infradead.org>
   8  * Additional Diskonchip 2000 and Millennium support by Dan Brown <dan_brown@ieee.org>
   9  * Diskonchip Millennium Plus support by Kalev Lember <kalev@smartlink.ee>
  10  *
  11  * Error correction code lifted from the old docecc code
  12  * Author: Fabrice Bellard (fabrice.bellard@netgem.com)
  13  * Copyright (C) 2000 Netgem S.A.
  14  * converted to the generic Reed-Solomon library by Thomas Gleixner <tglx@linutronix.de>
  15  *
  16  * Interface to generic NAND code for M-Systems DiskOnChip devices
  17  */
  18 
  19 #include <linux/kernel.h>
  20 #include <linux/init.h>
  21 #include <linux/sched.h>
  22 #include <linux/delay.h>
  23 #include <linux/rslib.h>
  24 #include <linux/moduleparam.h>
  25 #include <linux/slab.h>
  26 #include <linux/io.h>
  27 
  28 #include <linux/mtd/mtd.h>
  29 #include <linux/mtd/rawnand.h>
  30 #include <linux/mtd/doc2000.h>
  31 #include <linux/mtd/partitions.h>
  32 #include <linux/mtd/inftl.h>
  33 #include <linux/module.h>
  34 
  35 /* Where to look for the devices? */
  36 #ifndef CONFIG_MTD_NAND_DISKONCHIP_PROBE_ADDRESS
  37 #define CONFIG_MTD_NAND_DISKONCHIP_PROBE_ADDRESS 0
  38 #endif
  39 
  40 static unsigned long doc_locations[] __initdata = {
  41 #if defined (__alpha__) || defined(__i386__) || defined(__x86_64__)
  42 #ifdef CONFIG_MTD_NAND_DISKONCHIP_PROBE_HIGH
  43         0xfffc8000, 0xfffca000, 0xfffcc000, 0xfffce000,
  44         0xfffd0000, 0xfffd2000, 0xfffd4000, 0xfffd6000,
  45         0xfffd8000, 0xfffda000, 0xfffdc000, 0xfffde000,
  46         0xfffe0000, 0xfffe2000, 0xfffe4000, 0xfffe6000,
  47         0xfffe8000, 0xfffea000, 0xfffec000, 0xfffee000,
  48 #else
  49         0xc8000, 0xca000, 0xcc000, 0xce000,
  50         0xd0000, 0xd2000, 0xd4000, 0xd6000,
  51         0xd8000, 0xda000, 0xdc000, 0xde000,
  52         0xe0000, 0xe2000, 0xe4000, 0xe6000,
  53         0xe8000, 0xea000, 0xec000, 0xee000,
  54 #endif
  55 #endif
  56         0xffffffff };
  57 
  58 static struct mtd_info *doclist = NULL;
  59 
  60 struct doc_priv {
  61         void __iomem *virtadr;
  62         unsigned long physadr;
  63         u_char ChipID;
  64         u_char CDSNControl;
  65         int chips_per_floor;    /* The number of chips detected on each floor */
  66         int curfloor;
  67         int curchip;
  68         int mh0_page;
  69         int mh1_page;
  70         struct rs_control *rs_decoder;
  71         struct mtd_info *nextdoc;
  72 
  73         /* Handle the last stage of initialization (BBT scan, partitioning) */
  74         int (*late_init)(struct mtd_info *mtd);
  75 };
  76 
  77 /* This is the ecc value computed by the HW ecc generator upon writing an empty
  78    page, one with all 0xff for data. */
  79 static u_char empty_write_ecc[6] = { 0x4b, 0x00, 0xe2, 0x0e, 0x93, 0xf7 };
  80 
  81 #define INFTL_BBT_RESERVED_BLOCKS 4
  82 
  83 #define DoC_is_MillenniumPlus(doc) ((doc)->ChipID == DOC_ChipID_DocMilPlus16 || (doc)->ChipID == DOC_ChipID_DocMilPlus32)
  84 #define DoC_is_Millennium(doc) ((doc)->ChipID == DOC_ChipID_DocMil)
  85 #define DoC_is_2000(doc) ((doc)->ChipID == DOC_ChipID_Doc2k)
  86 
  87 static void doc200x_hwcontrol(struct nand_chip *this, int cmd,
  88                               unsigned int bitmask);
  89 static void doc200x_select_chip(struct nand_chip *this, int chip);
  90 
  91 static int debug = 0;
  92 module_param(debug, int, 0);
  93 
  94 static int try_dword = 1;
  95 module_param(try_dword, int, 0);
  96 
  97 static int no_ecc_failures = 0;
  98 module_param(no_ecc_failures, int, 0);
  99 
 100 static int no_autopart = 0;
 101 module_param(no_autopart, int, 0);
 102 
 103 static int show_firmware_partition = 0;
 104 module_param(show_firmware_partition, int, 0);
 105 
 106 #ifdef CONFIG_MTD_NAND_DISKONCHIP_BBTWRITE
 107 static int inftl_bbt_write = 1;
 108 #else
 109 static int inftl_bbt_write = 0;
 110 #endif
 111 module_param(inftl_bbt_write, int, 0);
 112 
 113 static unsigned long doc_config_location = CONFIG_MTD_NAND_DISKONCHIP_PROBE_ADDRESS;
 114 module_param(doc_config_location, ulong, 0);
 115 MODULE_PARM_DESC(doc_config_location, "Physical memory address at which to probe for DiskOnChip");
 116 
 117 /* Sector size for HW ECC */
 118 #define SECTOR_SIZE 512
 119 /* The sector bytes are packed into NB_DATA 10 bit words */
 120 #define NB_DATA (((SECTOR_SIZE + 1) * 8 + 6) / 10)
 121 /* Number of roots */
 122 #define NROOTS 4
 123 /* First consective root */
 124 #define FCR 510
 125 /* Number of symbols */
 126 #define NN 1023
 127 
 128 /*
 129  * The HW decoder in the DoC ASIC's provides us a error syndrome,
 130  * which we must convert to a standard syndrome usable by the generic
 131  * Reed-Solomon library code.
 132  *
 133  * Fabrice Bellard figured this out in the old docecc code. I added
 134  * some comments, improved a minor bit and converted it to make use
 135  * of the generic Reed-Solomon library. tglx
 136  */
 137 static int doc_ecc_decode(struct rs_control *rs, uint8_t *data, uint8_t *ecc)
 138 {
 139         int i, j, nerr, errpos[8];
 140         uint8_t parity;
 141         uint16_t ds[4], s[5], tmp, errval[8], syn[4];
 142         struct rs_codec *cd = rs->codec;
 143 
 144         memset(syn, 0, sizeof(syn));
 145         /* Convert the ecc bytes into words */
 146         ds[0] = ((ecc[4] & 0xff) >> 0) | ((ecc[5] & 0x03) << 8);
 147         ds[1] = ((ecc[5] & 0xfc) >> 2) | ((ecc[2] & 0x0f) << 6);
 148         ds[2] = ((ecc[2] & 0xf0) >> 4) | ((ecc[3] & 0x3f) << 4);
 149         ds[3] = ((ecc[3] & 0xc0) >> 6) | ((ecc[0] & 0xff) << 2);
 150         parity = ecc[1];
 151 
 152         /* Initialize the syndrome buffer */
 153         for (i = 0; i < NROOTS; i++)
 154                 s[i] = ds[0];
 155         /*
 156          *  Evaluate
 157          *  s[i] = ds[3]x^3 + ds[2]x^2 + ds[1]x^1 + ds[0]
 158          *  where x = alpha^(FCR + i)
 159          */
 160         for (j = 1; j < NROOTS; j++) {
 161                 if (ds[j] == 0)
 162                         continue;
 163                 tmp = cd->index_of[ds[j]];
 164                 for (i = 0; i < NROOTS; i++)
 165                         s[i] ^= cd->alpha_to[rs_modnn(cd, tmp + (FCR + i) * j)];
 166         }
 167 
 168         /* Calc syn[i] = s[i] / alpha^(v + i) */
 169         for (i = 0; i < NROOTS; i++) {
 170                 if (s[i])
 171                         syn[i] = rs_modnn(cd, cd->index_of[s[i]] + (NN - FCR - i));
 172         }
 173         /* Call the decoder library */
 174         nerr = decode_rs16(rs, NULL, NULL, 1019, syn, 0, errpos, 0, errval);
 175 
 176         /* Incorrectable errors ? */
 177         if (nerr < 0)
 178                 return nerr;
 179 
 180         /*
 181          * Correct the errors. The bitpositions are a bit of magic,
 182          * but they are given by the design of the de/encoder circuit
 183          * in the DoC ASIC's.
 184          */
 185         for (i = 0; i < nerr; i++) {
 186                 int index, bitpos, pos = 1015 - errpos[i];
 187                 uint8_t val;
 188                 if (pos >= NB_DATA && pos < 1019)
 189                         continue;
 190                 if (pos < NB_DATA) {
 191                         /* extract bit position (MSB first) */
 192                         pos = 10 * (NB_DATA - 1 - pos) - 6;
 193                         /* now correct the following 10 bits. At most two bytes
 194                            can be modified since pos is even */
 195                         index = (pos >> 3) ^ 1;
 196                         bitpos = pos & 7;
 197                         if ((index >= 0 && index < SECTOR_SIZE) || index == (SECTOR_SIZE + 1)) {
 198                                 val = (uint8_t) (errval[i] >> (2 + bitpos));
 199                                 parity ^= val;
 200                                 if (index < SECTOR_SIZE)
 201                                         data[index] ^= val;
 202                         }
 203                         index = ((pos >> 3) + 1) ^ 1;
 204                         bitpos = (bitpos + 10) & 7;
 205                         if (bitpos == 0)
 206                                 bitpos = 8;
 207                         if ((index >= 0 && index < SECTOR_SIZE) || index == (SECTOR_SIZE + 1)) {
 208                                 val = (uint8_t) (errval[i] << (8 - bitpos));
 209                                 parity ^= val;
 210                                 if (index < SECTOR_SIZE)
 211                                         data[index] ^= val;
 212                         }
 213                 }
 214         }
 215         /* If the parity is wrong, no rescue possible */
 216         return parity ? -EBADMSG : nerr;
 217 }
 218 
 219 static void DoC_Delay(struct doc_priv *doc, unsigned short cycles)
 220 {
 221         volatile char dummy;
 222         int i;
 223 
 224         for (i = 0; i < cycles; i++) {
 225                 if (DoC_is_Millennium(doc))
 226                         dummy = ReadDOC(doc->virtadr, NOP);
 227                 else if (DoC_is_MillenniumPlus(doc))
 228                         dummy = ReadDOC(doc->virtadr, Mplus_NOP);
 229                 else
 230                         dummy = ReadDOC(doc->virtadr, DOCStatus);
 231         }
 232 
 233 }
 234 
 235 #define CDSN_CTRL_FR_B_MASK     (CDSN_CTRL_FR_B0 | CDSN_CTRL_FR_B1)
 236 
 237 /* DOC_WaitReady: Wait for RDY line to be asserted by the flash chip */
 238 static int _DoC_WaitReady(struct doc_priv *doc)
 239 {
 240         void __iomem *docptr = doc->virtadr;
 241         unsigned long timeo = jiffies + (HZ * 10);
 242 
 243         if (debug)
 244                 printk("_DoC_WaitReady...\n");
 245         /* Out-of-line routine to wait for chip response */
 246         if (DoC_is_MillenniumPlus(doc)) {
 247                 while ((ReadDOC(docptr, Mplus_FlashControl) & CDSN_CTRL_FR_B_MASK) != CDSN_CTRL_FR_B_MASK) {
 248                         if (time_after(jiffies, timeo)) {
 249                                 printk("_DoC_WaitReady timed out.\n");
 250                                 return -EIO;
 251                         }
 252                         udelay(1);
 253                         cond_resched();
 254                 }
 255         } else {
 256                 while (!(ReadDOC(docptr, CDSNControl) & CDSN_CTRL_FR_B)) {
 257                         if (time_after(jiffies, timeo)) {
 258                                 printk("_DoC_WaitReady timed out.\n");
 259                                 return -EIO;
 260                         }
 261                         udelay(1);
 262                         cond_resched();
 263                 }
 264         }
 265 
 266         return 0;
 267 }
 268 
 269 static inline int DoC_WaitReady(struct doc_priv *doc)
 270 {
 271         void __iomem *docptr = doc->virtadr;
 272         int ret = 0;
 273 
 274         if (DoC_is_MillenniumPlus(doc)) {
 275                 DoC_Delay(doc, 4);
 276 
 277                 if ((ReadDOC(docptr, Mplus_FlashControl) & CDSN_CTRL_FR_B_MASK) != CDSN_CTRL_FR_B_MASK)
 278                         /* Call the out-of-line routine to wait */
 279                         ret = _DoC_WaitReady(doc);
 280         } else {
 281                 DoC_Delay(doc, 4);
 282 
 283                 if (!(ReadDOC(docptr, CDSNControl) & CDSN_CTRL_FR_B))
 284                         /* Call the out-of-line routine to wait */
 285                         ret = _DoC_WaitReady(doc);
 286                 DoC_Delay(doc, 2);
 287         }
 288 
 289         if (debug)
 290                 printk("DoC_WaitReady OK\n");
 291         return ret;
 292 }
 293 
 294 static void doc2000_write_byte(struct nand_chip *this, u_char datum)
 295 {
 296         struct doc_priv *doc = nand_get_controller_data(this);
 297         void __iomem *docptr = doc->virtadr;
 298 
 299         if (debug)
 300                 printk("write_byte %02x\n", datum);
 301         WriteDOC(datum, docptr, CDSNSlowIO);
 302         WriteDOC(datum, docptr, 2k_CDSN_IO);
 303 }
 304 
 305 static u_char doc2000_read_byte(struct nand_chip *this)
 306 {
 307         struct doc_priv *doc = nand_get_controller_data(this);
 308         void __iomem *docptr = doc->virtadr;
 309         u_char ret;
 310 
 311         ReadDOC(docptr, CDSNSlowIO);
 312         DoC_Delay(doc, 2);
 313         ret = ReadDOC(docptr, 2k_CDSN_IO);
 314         if (debug)
 315                 printk("read_byte returns %02x\n", ret);
 316         return ret;
 317 }
 318 
 319 static void doc2000_writebuf(struct nand_chip *this, const u_char *buf,
 320                              int len)
 321 {
 322         struct doc_priv *doc = nand_get_controller_data(this);
 323         void __iomem *docptr = doc->virtadr;
 324         int i;
 325         if (debug)
 326                 printk("writebuf of %d bytes: ", len);
 327         for (i = 0; i < len; i++) {
 328                 WriteDOC_(buf[i], docptr, DoC_2k_CDSN_IO + i);
 329                 if (debug && i < 16)
 330                         printk("%02x ", buf[i]);
 331         }
 332         if (debug)
 333                 printk("\n");
 334 }
 335 
 336 static void doc2000_readbuf(struct nand_chip *this, u_char *buf, int len)
 337 {
 338         struct doc_priv *doc = nand_get_controller_data(this);
 339         void __iomem *docptr = doc->virtadr;
 340         int i;
 341 
 342         if (debug)
 343                 printk("readbuf of %d bytes: ", len);
 344 
 345         for (i = 0; i < len; i++)
 346                 buf[i] = ReadDOC(docptr, 2k_CDSN_IO + i);
 347 }
 348 
 349 static void doc2000_readbuf_dword(struct nand_chip *this, u_char *buf, int len)
 350 {
 351         struct doc_priv *doc = nand_get_controller_data(this);
 352         void __iomem *docptr = doc->virtadr;
 353         int i;
 354 
 355         if (debug)
 356                 printk("readbuf_dword of %d bytes: ", len);
 357 
 358         if (unlikely((((unsigned long)buf) | len) & 3)) {
 359                 for (i = 0; i < len; i++) {
 360                         *(uint8_t *) (&buf[i]) = ReadDOC(docptr, 2k_CDSN_IO + i);
 361                 }
 362         } else {
 363                 for (i = 0; i < len; i += 4) {
 364                         *(uint32_t *) (&buf[i]) = readl(docptr + DoC_2k_CDSN_IO + i);
 365                 }
 366         }
 367 }
 368 
 369 static uint16_t __init doc200x_ident_chip(struct mtd_info *mtd, int nr)
 370 {
 371         struct nand_chip *this = mtd_to_nand(mtd);
 372         struct doc_priv *doc = nand_get_controller_data(this);
 373         uint16_t ret;
 374 
 375         doc200x_select_chip(this, nr);
 376         doc200x_hwcontrol(this, NAND_CMD_READID,
 377                           NAND_CTRL_CLE | NAND_CTRL_CHANGE);
 378         doc200x_hwcontrol(this, 0, NAND_CTRL_ALE | NAND_CTRL_CHANGE);
 379         doc200x_hwcontrol(this, NAND_CMD_NONE, NAND_NCE | NAND_CTRL_CHANGE);
 380 
 381         /* We can't use dev_ready here, but at least we wait for the
 382          * command to complete
 383          */
 384         udelay(50);
 385 
 386         ret = this->legacy.read_byte(this) << 8;
 387         ret |= this->legacy.read_byte(this);
 388 
 389         if (doc->ChipID == DOC_ChipID_Doc2k && try_dword && !nr) {
 390                 /* First chip probe. See if we get same results by 32-bit access */
 391                 union {
 392                         uint32_t dword;
 393                         uint8_t byte[4];
 394                 } ident;
 395                 void __iomem *docptr = doc->virtadr;
 396 
 397                 doc200x_hwcontrol(this, NAND_CMD_READID,
 398                                   NAND_CTRL_CLE | NAND_CTRL_CHANGE);
 399                 doc200x_hwcontrol(this, 0, NAND_CTRL_ALE | NAND_CTRL_CHANGE);
 400                 doc200x_hwcontrol(this, NAND_CMD_NONE,
 401                                   NAND_NCE | NAND_CTRL_CHANGE);
 402 
 403                 udelay(50);
 404 
 405                 ident.dword = readl(docptr + DoC_2k_CDSN_IO);
 406                 if (((ident.byte[0] << 8) | ident.byte[1]) == ret) {
 407                         pr_info("DiskOnChip 2000 responds to DWORD access\n");
 408                         this->legacy.read_buf = &doc2000_readbuf_dword;
 409                 }
 410         }
 411 
 412         return ret;
 413 }
 414 
 415 static void __init doc2000_count_chips(struct mtd_info *mtd)
 416 {
 417         struct nand_chip *this = mtd_to_nand(mtd);
 418         struct doc_priv *doc = nand_get_controller_data(this);
 419         uint16_t mfrid;
 420         int i;
 421 
 422         /* Max 4 chips per floor on DiskOnChip 2000 */
 423         doc->chips_per_floor = 4;
 424 
 425         /* Find out what the first chip is */
 426         mfrid = doc200x_ident_chip(mtd, 0);
 427 
 428         /* Find how many chips in each floor. */
 429         for (i = 1; i < 4; i++) {
 430                 if (doc200x_ident_chip(mtd, i) != mfrid)
 431                         break;
 432         }
 433         doc->chips_per_floor = i;
 434         pr_debug("Detected %d chips per floor.\n", i);
 435 }
 436 
 437 static int doc200x_wait(struct nand_chip *this)
 438 {
 439         struct doc_priv *doc = nand_get_controller_data(this);
 440 
 441         int status;
 442 
 443         DoC_WaitReady(doc);
 444         nand_status_op(this, NULL);
 445         DoC_WaitReady(doc);
 446         status = (int)this->legacy.read_byte(this);
 447 
 448         return status;
 449 }
 450 
 451 static void doc2001_write_byte(struct nand_chip *this, u_char datum)
 452 {
 453         struct doc_priv *doc = nand_get_controller_data(this);
 454         void __iomem *docptr = doc->virtadr;
 455 
 456         WriteDOC(datum, docptr, CDSNSlowIO);
 457         WriteDOC(datum, docptr, Mil_CDSN_IO);
 458         WriteDOC(datum, docptr, WritePipeTerm);
 459 }
 460 
 461 static u_char doc2001_read_byte(struct nand_chip *this)
 462 {
 463         struct doc_priv *doc = nand_get_controller_data(this);
 464         void __iomem *docptr = doc->virtadr;
 465 
 466         //ReadDOC(docptr, CDSNSlowIO);
 467         /* 11.4.5 -- delay twice to allow extended length cycle */
 468         DoC_Delay(doc, 2);
 469         ReadDOC(docptr, ReadPipeInit);
 470         //return ReadDOC(docptr, Mil_CDSN_IO);
 471         return ReadDOC(docptr, LastDataRead);
 472 }
 473 
 474 static void doc2001_writebuf(struct nand_chip *this, const u_char *buf, int len)
 475 {
 476         struct doc_priv *doc = nand_get_controller_data(this);
 477         void __iomem *docptr = doc->virtadr;
 478         int i;
 479 
 480         for (i = 0; i < len; i++)
 481                 WriteDOC_(buf[i], docptr, DoC_Mil_CDSN_IO + i);
 482         /* Terminate write pipeline */
 483         WriteDOC(0x00, docptr, WritePipeTerm);
 484 }
 485 
 486 static void doc2001_readbuf(struct nand_chip *this, u_char *buf, int len)
 487 {
 488         struct doc_priv *doc = nand_get_controller_data(this);
 489         void __iomem *docptr = doc->virtadr;
 490         int i;
 491 
 492         /* Start read pipeline */
 493         ReadDOC(docptr, ReadPipeInit);
 494 
 495         for (i = 0; i < len - 1; i++)
 496                 buf[i] = ReadDOC(docptr, Mil_CDSN_IO + (i & 0xff));
 497 
 498         /* Terminate read pipeline */
 499         buf[i] = ReadDOC(docptr, LastDataRead);
 500 }
 501 
 502 static u_char doc2001plus_read_byte(struct nand_chip *this)
 503 {
 504         struct doc_priv *doc = nand_get_controller_data(this);
 505         void __iomem *docptr = doc->virtadr;
 506         u_char ret;
 507 
 508         ReadDOC(docptr, Mplus_ReadPipeInit);
 509         ReadDOC(docptr, Mplus_ReadPipeInit);
 510         ret = ReadDOC(docptr, Mplus_LastDataRead);
 511         if (debug)
 512                 printk("read_byte returns %02x\n", ret);
 513         return ret;
 514 }
 515 
 516 static void doc2001plus_writebuf(struct nand_chip *this, const u_char *buf, int len)
 517 {
 518         struct doc_priv *doc = nand_get_controller_data(this);
 519         void __iomem *docptr = doc->virtadr;
 520         int i;
 521 
 522         if (debug)
 523                 printk("writebuf of %d bytes: ", len);
 524         for (i = 0; i < len; i++) {
 525                 WriteDOC_(buf[i], docptr, DoC_Mil_CDSN_IO + i);
 526                 if (debug && i < 16)
 527                         printk("%02x ", buf[i]);
 528         }
 529         if (debug)
 530                 printk("\n");
 531 }
 532 
 533 static void doc2001plus_readbuf(struct nand_chip *this, u_char *buf, int len)
 534 {
 535         struct doc_priv *doc = nand_get_controller_data(this);
 536         void __iomem *docptr = doc->virtadr;
 537         int i;
 538 
 539         if (debug)
 540                 printk("readbuf of %d bytes: ", len);
 541 
 542         /* Start read pipeline */
 543         ReadDOC(docptr, Mplus_ReadPipeInit);
 544         ReadDOC(docptr, Mplus_ReadPipeInit);
 545 
 546         for (i = 0; i < len - 2; i++) {
 547                 buf[i] = ReadDOC(docptr, Mil_CDSN_IO);
 548                 if (debug && i < 16)
 549                         printk("%02x ", buf[i]);
 550         }
 551 
 552         /* Terminate read pipeline */
 553         buf[len - 2] = ReadDOC(docptr, Mplus_LastDataRead);
 554         if (debug && i < 16)
 555                 printk("%02x ", buf[len - 2]);
 556         buf[len - 1] = ReadDOC(docptr, Mplus_LastDataRead);
 557         if (debug && i < 16)
 558                 printk("%02x ", buf[len - 1]);
 559         if (debug)
 560                 printk("\n");
 561 }
 562 
 563 static void doc2001plus_select_chip(struct nand_chip *this, int chip)
 564 {
 565         struct doc_priv *doc = nand_get_controller_data(this);
 566         void __iomem *docptr = doc->virtadr;
 567         int floor = 0;
 568 
 569         if (debug)
 570                 printk("select chip (%d)\n", chip);
 571 
 572         if (chip == -1) {
 573                 /* Disable flash internally */
 574                 WriteDOC(0, docptr, Mplus_FlashSelect);
 575                 return;
 576         }
 577 
 578         floor = chip / doc->chips_per_floor;
 579         chip -= (floor * doc->chips_per_floor);
 580 
 581         /* Assert ChipEnable and deassert WriteProtect */
 582         WriteDOC((DOC_FLASH_CE), docptr, Mplus_FlashSelect);
 583         nand_reset_op(this);
 584 
 585         doc->curchip = chip;
 586         doc->curfloor = floor;
 587 }
 588 
 589 static void doc200x_select_chip(struct nand_chip *this, int chip)
 590 {
 591         struct doc_priv *doc = nand_get_controller_data(this);
 592         void __iomem *docptr = doc->virtadr;
 593         int floor = 0;
 594 
 595         if (debug)
 596                 printk("select chip (%d)\n", chip);
 597 
 598         if (chip == -1)
 599                 return;
 600 
 601         floor = chip / doc->chips_per_floor;
 602         chip -= (floor * doc->chips_per_floor);
 603 
 604         /* 11.4.4 -- deassert CE before changing chip */
 605         doc200x_hwcontrol(this, NAND_CMD_NONE, 0 | NAND_CTRL_CHANGE);
 606 
 607         WriteDOC(floor, docptr, FloorSelect);
 608         WriteDOC(chip, docptr, CDSNDeviceSelect);
 609 
 610         doc200x_hwcontrol(this, NAND_CMD_NONE, NAND_NCE | NAND_CTRL_CHANGE);
 611 
 612         doc->curchip = chip;
 613         doc->curfloor = floor;
 614 }
 615 
 616 #define CDSN_CTRL_MSK (CDSN_CTRL_CE | CDSN_CTRL_CLE | CDSN_CTRL_ALE)
 617 
 618 static void doc200x_hwcontrol(struct nand_chip *this, int cmd,
 619                               unsigned int ctrl)
 620 {
 621         struct doc_priv *doc = nand_get_controller_data(this);
 622         void __iomem *docptr = doc->virtadr;
 623 
 624         if (ctrl & NAND_CTRL_CHANGE) {
 625                 doc->CDSNControl &= ~CDSN_CTRL_MSK;
 626                 doc->CDSNControl |= ctrl & CDSN_CTRL_MSK;
 627                 if (debug)
 628                         printk("hwcontrol(%d): %02x\n", cmd, doc->CDSNControl);
 629                 WriteDOC(doc->CDSNControl, docptr, CDSNControl);
 630                 /* 11.4.3 -- 4 NOPs after CSDNControl write */
 631                 DoC_Delay(doc, 4);
 632         }
 633         if (cmd != NAND_CMD_NONE) {
 634                 if (DoC_is_2000(doc))
 635                         doc2000_write_byte(this, cmd);
 636                 else
 637                         doc2001_write_byte(this, cmd);
 638         }
 639 }
 640 
 641 static void doc2001plus_command(struct nand_chip *this, unsigned command,
 642                                 int column, int page_addr)
 643 {
 644         struct mtd_info *mtd = nand_to_mtd(this);
 645         struct doc_priv *doc = nand_get_controller_data(this);
 646         void __iomem *docptr = doc->virtadr;
 647 
 648         /*
 649          * Must terminate write pipeline before sending any commands
 650          * to the device.
 651          */
 652         if (command == NAND_CMD_PAGEPROG) {
 653                 WriteDOC(0x00, docptr, Mplus_WritePipeTerm);
 654                 WriteDOC(0x00, docptr, Mplus_WritePipeTerm);
 655         }
 656 
 657         /*
 658          * Write out the command to the device.
 659          */
 660         if (command == NAND_CMD_SEQIN) {
 661                 int readcmd;
 662 
 663                 if (column >= mtd->writesize) {
 664                         /* OOB area */
 665                         column -= mtd->writesize;
 666                         readcmd = NAND_CMD_READOOB;
 667                 } else if (column < 256) {
 668                         /* First 256 bytes --> READ0 */
 669                         readcmd = NAND_CMD_READ0;
 670                 } else {
 671                         column -= 256;
 672                         readcmd = NAND_CMD_READ1;
 673                 }
 674                 WriteDOC(readcmd, docptr, Mplus_FlashCmd);
 675         }
 676         WriteDOC(command, docptr, Mplus_FlashCmd);
 677         WriteDOC(0, docptr, Mplus_WritePipeTerm);
 678         WriteDOC(0, docptr, Mplus_WritePipeTerm);
 679 
 680         if (column != -1 || page_addr != -1) {
 681                 /* Serially input address */
 682                 if (column != -1) {
 683                         /* Adjust columns for 16 bit buswidth */
 684                         if (this->options & NAND_BUSWIDTH_16 &&
 685                                         !nand_opcode_8bits(command))
 686                                 column >>= 1;
 687                         WriteDOC(column, docptr, Mplus_FlashAddress);
 688                 }
 689                 if (page_addr != -1) {
 690                         WriteDOC((unsigned char)(page_addr & 0xff), docptr, Mplus_FlashAddress);
 691                         WriteDOC((unsigned char)((page_addr >> 8) & 0xff), docptr, Mplus_FlashAddress);
 692                         if (this->options & NAND_ROW_ADDR_3) {
 693                                 WriteDOC((unsigned char)((page_addr >> 16) & 0x0f), docptr, Mplus_FlashAddress);
 694                                 printk("high density\n");
 695                         }
 696                 }
 697                 WriteDOC(0, docptr, Mplus_WritePipeTerm);
 698                 WriteDOC(0, docptr, Mplus_WritePipeTerm);
 699                 /* deassert ALE */
 700                 if (command == NAND_CMD_READ0 || command == NAND_CMD_READ1 ||
 701                     command == NAND_CMD_READOOB || command == NAND_CMD_READID)
 702                         WriteDOC(0, docptr, Mplus_FlashControl);
 703         }
 704 
 705         /*
 706          * program and erase have their own busy handlers
 707          * status and sequential in needs no delay
 708          */
 709         switch (command) {
 710 
 711         case NAND_CMD_PAGEPROG:
 712         case NAND_CMD_ERASE1:
 713         case NAND_CMD_ERASE2:
 714         case NAND_CMD_SEQIN:
 715         case NAND_CMD_STATUS:
 716                 return;
 717 
 718         case NAND_CMD_RESET:
 719                 if (this->legacy.dev_ready)
 720                         break;
 721                 udelay(this->legacy.chip_delay);
 722                 WriteDOC(NAND_CMD_STATUS, docptr, Mplus_FlashCmd);
 723                 WriteDOC(0, docptr, Mplus_WritePipeTerm);
 724                 WriteDOC(0, docptr, Mplus_WritePipeTerm);
 725                 while (!(this->legacy.read_byte(this) & 0x40)) ;
 726                 return;
 727 
 728                 /* This applies to read commands */
 729         default:
 730                 /*
 731                  * If we don't have access to the busy pin, we apply the given
 732                  * command delay
 733                  */
 734                 if (!this->legacy.dev_ready) {
 735                         udelay(this->legacy.chip_delay);
 736                         return;
 737                 }
 738         }
 739 
 740         /* Apply this short delay always to ensure that we do wait tWB in
 741          * any case on any machine. */
 742         ndelay(100);
 743         /* wait until command is processed */
 744         while (!this->legacy.dev_ready(this)) ;
 745 }
 746 
 747 static int doc200x_dev_ready(struct nand_chip *this)
 748 {
 749         struct doc_priv *doc = nand_get_controller_data(this);
 750         void __iomem *docptr = doc->virtadr;
 751 
 752         if (DoC_is_MillenniumPlus(doc)) {
 753                 /* 11.4.2 -- must NOP four times before checking FR/B# */
 754                 DoC_Delay(doc, 4);
 755                 if ((ReadDOC(docptr, Mplus_FlashControl) & CDSN_CTRL_FR_B_MASK) != CDSN_CTRL_FR_B_MASK) {
 756                         if (debug)
 757                                 printk("not ready\n");
 758                         return 0;
 759                 }
 760                 if (debug)
 761                         printk("was ready\n");
 762                 return 1;
 763         } else {
 764                 /* 11.4.2 -- must NOP four times before checking FR/B# */
 765                 DoC_Delay(doc, 4);
 766                 if (!(ReadDOC(docptr, CDSNControl) & CDSN_CTRL_FR_B)) {
 767                         if (debug)
 768                                 printk("not ready\n");
 769                         return 0;
 770                 }
 771                 /* 11.4.2 -- Must NOP twice if it's ready */
 772                 DoC_Delay(doc, 2);
 773                 if (debug)
 774                         printk("was ready\n");
 775                 return 1;
 776         }
 777 }
 778 
 779 static int doc200x_block_bad(struct nand_chip *this, loff_t ofs)
 780 {
 781         /* This is our last resort if we couldn't find or create a BBT.  Just
 782            pretend all blocks are good. */
 783         return 0;
 784 }
 785 
 786 static void doc200x_enable_hwecc(struct nand_chip *this, int mode)
 787 {
 788         struct doc_priv *doc = nand_get_controller_data(this);
 789         void __iomem *docptr = doc->virtadr;
 790 
 791         /* Prime the ECC engine */
 792         switch (mode) {
 793         case NAND_ECC_READ:
 794                 WriteDOC(DOC_ECC_RESET, docptr, ECCConf);
 795                 WriteDOC(DOC_ECC_EN, docptr, ECCConf);
 796                 break;
 797         case NAND_ECC_WRITE:
 798                 WriteDOC(DOC_ECC_RESET, docptr, ECCConf);
 799                 WriteDOC(DOC_ECC_EN | DOC_ECC_RW, docptr, ECCConf);
 800                 break;
 801         }
 802 }
 803 
 804 static void doc2001plus_enable_hwecc(struct nand_chip *this, int mode)
 805 {
 806         struct doc_priv *doc = nand_get_controller_data(this);
 807         void __iomem *docptr = doc->virtadr;
 808 
 809         /* Prime the ECC engine */
 810         switch (mode) {
 811         case NAND_ECC_READ:
 812                 WriteDOC(DOC_ECC_RESET, docptr, Mplus_ECCConf);
 813                 WriteDOC(DOC_ECC_EN, docptr, Mplus_ECCConf);
 814                 break;
 815         case NAND_ECC_WRITE:
 816                 WriteDOC(DOC_ECC_RESET, docptr, Mplus_ECCConf);
 817                 WriteDOC(DOC_ECC_EN | DOC_ECC_RW, docptr, Mplus_ECCConf);
 818                 break;
 819         }
 820 }
 821 
 822 /* This code is only called on write */
 823 static int doc200x_calculate_ecc(struct nand_chip *this, const u_char *dat,
 824                                  unsigned char *ecc_code)
 825 {
 826         struct doc_priv *doc = nand_get_controller_data(this);
 827         void __iomem *docptr = doc->virtadr;
 828         int i;
 829         int emptymatch = 1;
 830 
 831         /* flush the pipeline */
 832         if (DoC_is_2000(doc)) {
 833                 WriteDOC(doc->CDSNControl & ~CDSN_CTRL_FLASH_IO, docptr, CDSNControl);
 834                 WriteDOC(0, docptr, 2k_CDSN_IO);
 835                 WriteDOC(0, docptr, 2k_CDSN_IO);
 836                 WriteDOC(0, docptr, 2k_CDSN_IO);
 837                 WriteDOC(doc->CDSNControl, docptr, CDSNControl);
 838         } else if (DoC_is_MillenniumPlus(doc)) {
 839                 WriteDOC(0, docptr, Mplus_NOP);
 840                 WriteDOC(0, docptr, Mplus_NOP);
 841                 WriteDOC(0, docptr, Mplus_NOP);
 842         } else {
 843                 WriteDOC(0, docptr, NOP);
 844                 WriteDOC(0, docptr, NOP);
 845                 WriteDOC(0, docptr, NOP);
 846         }
 847 
 848         for (i = 0; i < 6; i++) {
 849                 if (DoC_is_MillenniumPlus(doc))
 850                         ecc_code[i] = ReadDOC_(docptr, DoC_Mplus_ECCSyndrome0 + i);
 851                 else
 852                         ecc_code[i] = ReadDOC_(docptr, DoC_ECCSyndrome0 + i);
 853                 if (ecc_code[i] != empty_write_ecc[i])
 854                         emptymatch = 0;
 855         }
 856         if (DoC_is_MillenniumPlus(doc))
 857                 WriteDOC(DOC_ECC_DIS, docptr, Mplus_ECCConf);
 858         else
 859                 WriteDOC(DOC_ECC_DIS, docptr, ECCConf);
 860 #if 0
 861         /* If emptymatch=1, we might have an all-0xff data buffer.  Check. */
 862         if (emptymatch) {
 863                 /* Note: this somewhat expensive test should not be triggered
 864                    often.  It could be optimized away by examining the data in
 865                    the writebuf routine, and remembering the result. */
 866                 for (i = 0; i < 512; i++) {
 867                         if (dat[i] == 0xff)
 868                                 continue;
 869                         emptymatch = 0;
 870                         break;
 871                 }
 872         }
 873         /* If emptymatch still =1, we do have an all-0xff data buffer.
 874            Return all-0xff ecc value instead of the computed one, so
 875            it'll look just like a freshly-erased page. */
 876         if (emptymatch)
 877                 memset(ecc_code, 0xff, 6);
 878 #endif
 879         return 0;
 880 }
 881 
 882 static int doc200x_correct_data(struct nand_chip *this, u_char *dat,
 883                                 u_char *read_ecc, u_char *isnull)
 884 {
 885         int i, ret = 0;
 886         struct doc_priv *doc = nand_get_controller_data(this);
 887         void __iomem *docptr = doc->virtadr;
 888         uint8_t calc_ecc[6];
 889         volatile u_char dummy;
 890 
 891         /* flush the pipeline */
 892         if (DoC_is_2000(doc)) {
 893                 dummy = ReadDOC(docptr, 2k_ECCStatus);
 894                 dummy = ReadDOC(docptr, 2k_ECCStatus);
 895                 dummy = ReadDOC(docptr, 2k_ECCStatus);
 896         } else if (DoC_is_MillenniumPlus(doc)) {
 897                 dummy = ReadDOC(docptr, Mplus_ECCConf);
 898                 dummy = ReadDOC(docptr, Mplus_ECCConf);
 899                 dummy = ReadDOC(docptr, Mplus_ECCConf);
 900         } else {
 901                 dummy = ReadDOC(docptr, ECCConf);
 902                 dummy = ReadDOC(docptr, ECCConf);
 903                 dummy = ReadDOC(docptr, ECCConf);
 904         }
 905 
 906         /* Error occurred ? */
 907         if (dummy & 0x80) {
 908                 for (i = 0; i < 6; i++) {
 909                         if (DoC_is_MillenniumPlus(doc))
 910                                 calc_ecc[i] = ReadDOC_(docptr, DoC_Mplus_ECCSyndrome0 + i);
 911                         else
 912                                 calc_ecc[i] = ReadDOC_(docptr, DoC_ECCSyndrome0 + i);
 913                 }
 914 
 915                 ret = doc_ecc_decode(doc->rs_decoder, dat, calc_ecc);
 916                 if (ret > 0)
 917                         pr_err("doc200x_correct_data corrected %d errors\n",
 918                                ret);
 919         }
 920         if (DoC_is_MillenniumPlus(doc))
 921                 WriteDOC(DOC_ECC_DIS, docptr, Mplus_ECCConf);
 922         else
 923                 WriteDOC(DOC_ECC_DIS, docptr, ECCConf);
 924         if (no_ecc_failures && mtd_is_eccerr(ret)) {
 925                 pr_err("suppressing ECC failure\n");
 926                 ret = 0;
 927         }
 928         return ret;
 929 }
 930 
 931 //u_char mydatabuf[528];
 932 
 933 static int doc200x_ooblayout_ecc(struct mtd_info *mtd, int section,
 934                                  struct mtd_oob_region *oobregion)
 935 {
 936         if (section)
 937                 return -ERANGE;
 938 
 939         oobregion->offset = 0;
 940         oobregion->length = 6;
 941 
 942         return 0;
 943 }
 944 
 945 static int doc200x_ooblayout_free(struct mtd_info *mtd, int section,
 946                                   struct mtd_oob_region *oobregion)
 947 {
 948         if (section > 1)
 949                 return -ERANGE;
 950 
 951         /*
 952          * The strange out-of-order free bytes definition is a (possibly
 953          * unneeded) attempt to retain compatibility.  It used to read:
 954          *      .oobfree = { {8, 8} }
 955          * Since that leaves two bytes unusable, it was changed.  But the
 956          * following scheme might affect existing jffs2 installs by moving the
 957          * cleanmarker:
 958          *      .oobfree = { {6, 10} }
 959          * jffs2 seems to handle the above gracefully, but the current scheme
 960          * seems safer. The only problem with it is that any code retrieving
 961          * free bytes position must be able to handle out-of-order segments.
 962          */
 963         if (!section) {
 964                 oobregion->offset = 8;
 965                 oobregion->length = 8;
 966         } else {
 967                 oobregion->offset = 6;
 968                 oobregion->length = 2;
 969         }
 970 
 971         return 0;
 972 }
 973 
 974 static const struct mtd_ooblayout_ops doc200x_ooblayout_ops = {
 975         .ecc = doc200x_ooblayout_ecc,
 976         .free = doc200x_ooblayout_free,
 977 };
 978 
 979 /* Find the (I)NFTL Media Header, and optionally also the mirror media header.
 980    On successful return, buf will contain a copy of the media header for
 981    further processing.  id is the string to scan for, and will presumably be
 982    either "ANAND" or "BNAND".  If findmirror=1, also look for the mirror media
 983    header.  The page #s of the found media headers are placed in mh0_page and
 984    mh1_page in the DOC private structure. */
 985 static int __init find_media_headers(struct mtd_info *mtd, u_char *buf, const char *id, int findmirror)
 986 {
 987         struct nand_chip *this = mtd_to_nand(mtd);
 988         struct doc_priv *doc = nand_get_controller_data(this);
 989         unsigned offs;
 990         int ret;
 991         size_t retlen;
 992 
 993         for (offs = 0; offs < mtd->size; offs += mtd->erasesize) {
 994                 ret = mtd_read(mtd, offs, mtd->writesize, &retlen, buf);
 995                 if (retlen != mtd->writesize)
 996                         continue;
 997                 if (ret) {
 998                         pr_warn("ECC error scanning DOC at 0x%x\n", offs);
 999                 }
1000                 if (memcmp(buf, id, 6))
1001                         continue;
1002                 pr_info("Found DiskOnChip %s Media Header at 0x%x\n", id, offs);
1003                 if (doc->mh0_page == -1) {
1004                         doc->mh0_page = offs >> this->page_shift;
1005                         if (!findmirror)
1006                                 return 1;
1007                         continue;
1008                 }
1009                 doc->mh1_page = offs >> this->page_shift;
1010                 return 2;
1011         }
1012         if (doc->mh0_page == -1) {
1013                 pr_warn("DiskOnChip %s Media Header not found.\n", id);
1014                 return 0;
1015         }
1016         /* Only one mediaheader was found.  We want buf to contain a
1017            mediaheader on return, so we'll have to re-read the one we found. */
1018         offs = doc->mh0_page << this->page_shift;
1019         ret = mtd_read(mtd, offs, mtd->writesize, &retlen, buf);
1020         if (retlen != mtd->writesize) {
1021                 /* Insanity.  Give up. */
1022                 pr_err("Read DiskOnChip Media Header once, but can't reread it???\n");
1023                 return 0;
1024         }
1025         return 1;
1026 }
1027 
1028 static inline int __init nftl_partscan(struct mtd_info *mtd, struct mtd_partition *parts)
1029 {
1030         struct nand_chip *this = mtd_to_nand(mtd);
1031         struct doc_priv *doc = nand_get_controller_data(this);
1032         struct nand_memory_organization *memorg;
1033         int ret = 0;
1034         u_char *buf;
1035         struct NFTLMediaHeader *mh;
1036         const unsigned psize = 1 << this->page_shift;
1037         int numparts = 0;
1038         unsigned blocks, maxblocks;
1039         int offs, numheaders;
1040 
1041         memorg = nanddev_get_memorg(&this->base);
1042 
1043         buf = kmalloc(mtd->writesize, GFP_KERNEL);
1044         if (!buf) {
1045                 return 0;
1046         }
1047         if (!(numheaders = find_media_headers(mtd, buf, "ANAND", 1)))
1048                 goto out;
1049         mh = (struct NFTLMediaHeader *)buf;
1050 
1051         le16_to_cpus(&mh->NumEraseUnits);
1052         le16_to_cpus(&mh->FirstPhysicalEUN);
1053         le32_to_cpus(&mh->FormattedSize);
1054 
1055         pr_info("    DataOrgID        = %s\n"
1056                 "    NumEraseUnits    = %d\n"
1057                 "    FirstPhysicalEUN = %d\n"
1058                 "    FormattedSize    = %d\n"
1059                 "    UnitSizeFactor   = %d\n",
1060                 mh->DataOrgID, mh->NumEraseUnits,
1061                 mh->FirstPhysicalEUN, mh->FormattedSize,
1062                 mh->UnitSizeFactor);
1063 
1064         blocks = mtd->size >> this->phys_erase_shift;
1065         maxblocks = min(32768U, mtd->erasesize - psize);
1066 
1067         if (mh->UnitSizeFactor == 0x00) {
1068                 /* Auto-determine UnitSizeFactor.  The constraints are:
1069                    - There can be at most 32768 virtual blocks.
1070                    - There can be at most (virtual block size - page size)
1071                    virtual blocks (because MediaHeader+BBT must fit in 1).
1072                  */
1073                 mh->UnitSizeFactor = 0xff;
1074                 while (blocks > maxblocks) {
1075                         blocks >>= 1;
1076                         maxblocks = min(32768U, (maxblocks << 1) + psize);
1077                         mh->UnitSizeFactor--;
1078                 }
1079                 pr_warn("UnitSizeFactor=0x00 detected.  Correct value is assumed to be 0x%02x.\n", mh->UnitSizeFactor);
1080         }
1081 
1082         /* NOTE: The lines below modify internal variables of the NAND and MTD
1083            layers; variables with have already been configured by nand_scan.
1084            Unfortunately, we didn't know before this point what these values
1085            should be.  Thus, this code is somewhat dependent on the exact
1086            implementation of the NAND layer.  */
1087         if (mh->UnitSizeFactor != 0xff) {
1088                 this->bbt_erase_shift += (0xff - mh->UnitSizeFactor);
1089                 memorg->pages_per_eraseblock <<= (0xff - mh->UnitSizeFactor);
1090                 mtd->erasesize <<= (0xff - mh->UnitSizeFactor);
1091                 pr_info("Setting virtual erase size to %d\n", mtd->erasesize);
1092                 blocks = mtd->size >> this->bbt_erase_shift;
1093                 maxblocks = min(32768U, mtd->erasesize - psize);
1094         }
1095 
1096         if (blocks > maxblocks) {
1097                 pr_err("UnitSizeFactor of 0x%02x is inconsistent with device size.  Aborting.\n", mh->UnitSizeFactor);
1098                 goto out;
1099         }
1100 
1101         /* Skip past the media headers. */
1102         offs = max(doc->mh0_page, doc->mh1_page);
1103         offs <<= this->page_shift;
1104         offs += mtd->erasesize;
1105 
1106         if (show_firmware_partition == 1) {
1107                 parts[0].name = " DiskOnChip Firmware / Media Header partition";
1108                 parts[0].offset = 0;
1109                 parts[0].size = offs;
1110                 numparts = 1;
1111         }
1112 
1113         parts[numparts].name = " DiskOnChip BDTL partition";
1114         parts[numparts].offset = offs;
1115         parts[numparts].size = (mh->NumEraseUnits - numheaders) << this->bbt_erase_shift;
1116 
1117         offs += parts[numparts].size;
1118         numparts++;
1119 
1120         if (offs < mtd->size) {
1121                 parts[numparts].name = " DiskOnChip Remainder partition";
1122                 parts[numparts].offset = offs;
1123                 parts[numparts].size = mtd->size - offs;
1124                 numparts++;
1125         }
1126 
1127         ret = numparts;
1128  out:
1129         kfree(buf);
1130         return ret;
1131 }
1132 
1133 /* This is a stripped-down copy of the code in inftlmount.c */
1134 static inline int __init inftl_partscan(struct mtd_info *mtd, struct mtd_partition *parts)
1135 {
1136         struct nand_chip *this = mtd_to_nand(mtd);
1137         struct doc_priv *doc = nand_get_controller_data(this);
1138         int ret = 0;
1139         u_char *buf;
1140         struct INFTLMediaHeader *mh;
1141         struct INFTLPartition *ip;
1142         int numparts = 0;
1143         int blocks;
1144         int vshift, lastvunit = 0;
1145         int i;
1146         int end = mtd->size;
1147 
1148         if (inftl_bbt_write)
1149                 end -= (INFTL_BBT_RESERVED_BLOCKS << this->phys_erase_shift);
1150 
1151         buf = kmalloc(mtd->writesize, GFP_KERNEL);
1152         if (!buf) {
1153                 return 0;
1154         }
1155 
1156         if (!find_media_headers(mtd, buf, "BNAND", 0))
1157                 goto out;
1158         doc->mh1_page = doc->mh0_page + (4096 >> this->page_shift);
1159         mh = (struct INFTLMediaHeader *)buf;
1160 
1161         le32_to_cpus(&mh->NoOfBootImageBlocks);
1162         le32_to_cpus(&mh->NoOfBinaryPartitions);
1163         le32_to_cpus(&mh->NoOfBDTLPartitions);
1164         le32_to_cpus(&mh->BlockMultiplierBits);
1165         le32_to_cpus(&mh->FormatFlags);
1166         le32_to_cpus(&mh->PercentUsed);
1167 
1168         pr_info("    bootRecordID          = %s\n"
1169                 "    NoOfBootImageBlocks   = %d\n"
1170                 "    NoOfBinaryPartitions  = %d\n"
1171                 "    NoOfBDTLPartitions    = %d\n"
1172                 "    BlockMultiplerBits    = %d\n"
1173                 "    FormatFlgs            = %d\n"
1174                 "    OsakVersion           = %d.%d.%d.%d\n"
1175                 "    PercentUsed           = %d\n",
1176                 mh->bootRecordID, mh->NoOfBootImageBlocks,
1177                 mh->NoOfBinaryPartitions,
1178                 mh->NoOfBDTLPartitions,
1179                 mh->BlockMultiplierBits, mh->FormatFlags,
1180                 ((unsigned char *) &mh->OsakVersion)[0] & 0xf,
1181                 ((unsigned char *) &mh->OsakVersion)[1] & 0xf,
1182                 ((unsigned char *) &mh->OsakVersion)[2] & 0xf,
1183                 ((unsigned char *) &mh->OsakVersion)[3] & 0xf,
1184                 mh->PercentUsed);
1185 
1186         vshift = this->phys_erase_shift + mh->BlockMultiplierBits;
1187 
1188         blocks = mtd->size >> vshift;
1189         if (blocks > 32768) {
1190                 pr_err("BlockMultiplierBits=%d is inconsistent with device size.  Aborting.\n", mh->BlockMultiplierBits);
1191                 goto out;
1192         }
1193 
1194         blocks = doc->chips_per_floor << (this->chip_shift - this->phys_erase_shift);
1195         if (inftl_bbt_write && (blocks > mtd->erasesize)) {
1196                 pr_err("Writeable BBTs spanning more than one erase block are not yet supported.  FIX ME!\n");
1197                 goto out;
1198         }
1199 
1200         /* Scan the partitions */
1201         for (i = 0; (i < 4); i++) {
1202                 ip = &(mh->Partitions[i]);
1203                 le32_to_cpus(&ip->virtualUnits);
1204                 le32_to_cpus(&ip->firstUnit);
1205                 le32_to_cpus(&ip->lastUnit);
1206                 le32_to_cpus(&ip->flags);
1207                 le32_to_cpus(&ip->spareUnits);
1208                 le32_to_cpus(&ip->Reserved0);
1209 
1210                 pr_info("    PARTITION[%d] ->\n"
1211                         "        virtualUnits    = %d\n"
1212                         "        firstUnit       = %d\n"
1213                         "        lastUnit        = %d\n"
1214                         "        flags           = 0x%x\n"
1215                         "        spareUnits      = %d\n",
1216                         i, ip->virtualUnits, ip->firstUnit,
1217                         ip->lastUnit, ip->flags,
1218                         ip->spareUnits);
1219 
1220                 if ((show_firmware_partition == 1) &&
1221                     (i == 0) && (ip->firstUnit > 0)) {
1222                         parts[0].name = " DiskOnChip IPL / Media Header partition";
1223                         parts[0].offset = 0;
1224                         parts[0].size = mtd->erasesize * ip->firstUnit;
1225                         numparts = 1;
1226                 }
1227 
1228                 if (ip->flags & INFTL_BINARY)
1229                         parts[numparts].name = " DiskOnChip BDK partition";
1230                 else
1231                         parts[numparts].name = " DiskOnChip BDTL partition";
1232                 parts[numparts].offset = ip->firstUnit << vshift;
1233                 parts[numparts].size = (1 + ip->lastUnit - ip->firstUnit) << vshift;
1234                 numparts++;
1235                 if (ip->lastUnit > lastvunit)
1236                         lastvunit = ip->lastUnit;
1237                 if (ip->flags & INFTL_LAST)
1238                         break;
1239         }
1240         lastvunit++;
1241         if ((lastvunit << vshift) < end) {
1242                 parts[numparts].name = " DiskOnChip Remainder partition";
1243                 parts[numparts].offset = lastvunit << vshift;
1244                 parts[numparts].size = end - parts[numparts].offset;
1245                 numparts++;
1246         }
1247         ret = numparts;
1248  out:
1249         kfree(buf);
1250         return ret;
1251 }
1252 
1253 static int __init nftl_scan_bbt(struct mtd_info *mtd)
1254 {
1255         int ret, numparts;
1256         struct nand_chip *this = mtd_to_nand(mtd);
1257         struct doc_priv *doc = nand_get_controller_data(this);
1258         struct mtd_partition parts[2];
1259 
1260         memset((char *)parts, 0, sizeof(parts));
1261         /* On NFTL, we have to find the media headers before we can read the
1262            BBTs, since they're stored in the media header eraseblocks. */
1263         numparts = nftl_partscan(mtd, parts);
1264         if (!numparts)
1265                 return -EIO;
1266         this->bbt_td->options = NAND_BBT_ABSPAGE | NAND_BBT_8BIT |
1267                                 NAND_BBT_SAVECONTENT | NAND_BBT_WRITE |
1268                                 NAND_BBT_VERSION;
1269         this->bbt_td->veroffs = 7;
1270         this->bbt_td->pages[0] = doc->mh0_page + 1;
1271         if (doc->mh1_page != -1) {
1272                 this->bbt_md->options = NAND_BBT_ABSPAGE | NAND_BBT_8BIT |
1273                                         NAND_BBT_SAVECONTENT | NAND_BBT_WRITE |
1274                                         NAND_BBT_VERSION;
1275                 this->bbt_md->veroffs = 7;
1276                 this->bbt_md->pages[0] = doc->mh1_page + 1;
1277         } else {
1278                 this->bbt_md = NULL;
1279         }
1280 
1281         ret = nand_create_bbt(this);
1282         if (ret)
1283                 return ret;
1284 
1285         return mtd_device_register(mtd, parts, no_autopart ? 0 : numparts);
1286 }
1287 
1288 static int __init inftl_scan_bbt(struct mtd_info *mtd)
1289 {
1290         int ret, numparts;
1291         struct nand_chip *this = mtd_to_nand(mtd);
1292         struct doc_priv *doc = nand_get_controller_data(this);
1293         struct mtd_partition parts[5];
1294 
1295         if (nanddev_ntargets(&this->base) > doc->chips_per_floor) {
1296                 pr_err("Multi-floor INFTL devices not yet supported.\n");
1297                 return -EIO;
1298         }
1299 
1300         if (DoC_is_MillenniumPlus(doc)) {
1301                 this->bbt_td->options = NAND_BBT_2BIT | NAND_BBT_ABSPAGE;
1302                 if (inftl_bbt_write)
1303                         this->bbt_td->options |= NAND_BBT_WRITE;
1304                 this->bbt_td->pages[0] = 2;
1305                 this->bbt_md = NULL;
1306         } else {
1307                 this->bbt_td->options = NAND_BBT_LASTBLOCK | NAND_BBT_8BIT | NAND_BBT_VERSION;
1308                 if (inftl_bbt_write)
1309                         this->bbt_td->options |= NAND_BBT_WRITE;
1310                 this->bbt_td->offs = 8;
1311                 this->bbt_td->len = 8;
1312                 this->bbt_td->veroffs = 7;
1313                 this->bbt_td->maxblocks = INFTL_BBT_RESERVED_BLOCKS;
1314                 this->bbt_td->reserved_block_code = 0x01;
1315                 this->bbt_td->pattern = "MSYS_BBT";
1316 
1317                 this->bbt_md->options = NAND_BBT_LASTBLOCK | NAND_BBT_8BIT | NAND_BBT_VERSION;
1318                 if (inftl_bbt_write)
1319                         this->bbt_md->options |= NAND_BBT_WRITE;
1320                 this->bbt_md->offs = 8;
1321                 this->bbt_md->len = 8;
1322                 this->bbt_md->veroffs = 7;
1323                 this->bbt_md->maxblocks = INFTL_BBT_RESERVED_BLOCKS;
1324                 this->bbt_md->reserved_block_code = 0x01;
1325                 this->bbt_md->pattern = "TBB_SYSM";
1326         }
1327 
1328         ret = nand_create_bbt(this);
1329         if (ret)
1330                 return ret;
1331 
1332         memset((char *)parts, 0, sizeof(parts));
1333         numparts = inftl_partscan(mtd, parts);
1334         /* At least for now, require the INFTL Media Header.  We could probably
1335            do without it for non-INFTL use, since all it gives us is
1336            autopartitioning, but I want to give it more thought. */
1337         if (!numparts)
1338                 return -EIO;
1339         return mtd_device_register(mtd, parts, no_autopart ? 0 : numparts);
1340 }
1341 
1342 static inline int __init doc2000_init(struct mtd_info *mtd)
1343 {
1344         struct nand_chip *this = mtd_to_nand(mtd);
1345         struct doc_priv *doc = nand_get_controller_data(this);
1346 
1347         this->legacy.read_byte = doc2000_read_byte;
1348         this->legacy.write_buf = doc2000_writebuf;
1349         this->legacy.read_buf = doc2000_readbuf;
1350         doc->late_init = nftl_scan_bbt;
1351 
1352         doc->CDSNControl = CDSN_CTRL_FLASH_IO | CDSN_CTRL_ECC_IO;
1353         doc2000_count_chips(mtd);
1354         mtd->name = "DiskOnChip 2000 (NFTL Model)";
1355         return (4 * doc->chips_per_floor);
1356 }
1357 
1358 static inline int __init doc2001_init(struct mtd_info *mtd)
1359 {
1360         struct nand_chip *this = mtd_to_nand(mtd);
1361         struct doc_priv *doc = nand_get_controller_data(this);
1362 
1363         this->legacy.read_byte = doc2001_read_byte;
1364         this->legacy.write_buf = doc2001_writebuf;
1365         this->legacy.read_buf = doc2001_readbuf;
1366 
1367         ReadDOC(doc->virtadr, ChipID);
1368         ReadDOC(doc->virtadr, ChipID);
1369         ReadDOC(doc->virtadr, ChipID);
1370         if (ReadDOC(doc->virtadr, ChipID) != DOC_ChipID_DocMil) {
1371                 /* It's not a Millennium; it's one of the newer
1372                    DiskOnChip 2000 units with a similar ASIC.
1373                    Treat it like a Millennium, except that it
1374                    can have multiple chips. */
1375                 doc2000_count_chips(mtd);
1376                 mtd->name = "DiskOnChip 2000 (INFTL Model)";
1377                 doc->late_init = inftl_scan_bbt;
1378                 return (4 * doc->chips_per_floor);
1379         } else {
1380                 /* Bog-standard Millennium */
1381                 doc->chips_per_floor = 1;
1382                 mtd->name = "DiskOnChip Millennium";
1383                 doc->late_init = nftl_scan_bbt;
1384                 return 1;
1385         }
1386 }
1387 
1388 static inline int __init doc2001plus_init(struct mtd_info *mtd)
1389 {
1390         struct nand_chip *this = mtd_to_nand(mtd);
1391         struct doc_priv *doc = nand_get_controller_data(this);
1392 
1393         this->legacy.read_byte = doc2001plus_read_byte;
1394         this->legacy.write_buf = doc2001plus_writebuf;
1395         this->legacy.read_buf = doc2001plus_readbuf;
1396         doc->late_init = inftl_scan_bbt;
1397         this->legacy.cmd_ctrl = NULL;
1398         this->legacy.select_chip = doc2001plus_select_chip;
1399         this->legacy.cmdfunc = doc2001plus_command;
1400         this->ecc.hwctl = doc2001plus_enable_hwecc;
1401 
1402         doc->chips_per_floor = 1;
1403         mtd->name = "DiskOnChip Millennium Plus";
1404 
1405         return 1;
1406 }
1407 
1408 static int __init doc_probe(unsigned long physadr)
1409 {
1410         struct nand_chip *nand = NULL;
1411         struct doc_priv *doc = NULL;
1412         unsigned char ChipID;
1413         struct mtd_info *mtd;
1414         void __iomem *virtadr;
1415         unsigned char save_control;
1416         unsigned char tmp, tmpb, tmpc;
1417         int reg, len, numchips;
1418         int ret = 0;
1419 
1420         if (!request_mem_region(physadr, DOC_IOREMAP_LEN, "DiskOnChip"))
1421                 return -EBUSY;
1422         virtadr = ioremap(physadr, DOC_IOREMAP_LEN);
1423         if (!virtadr) {
1424                 pr_err("Diskonchip ioremap failed: 0x%x bytes at 0x%lx\n",
1425                        DOC_IOREMAP_LEN, physadr);
1426                 ret = -EIO;
1427                 goto error_ioremap;
1428         }
1429 
1430         /* It's not possible to cleanly detect the DiskOnChip - the
1431          * bootup procedure will put the device into reset mode, and
1432          * it's not possible to talk to it without actually writing
1433          * to the DOCControl register. So we store the current contents
1434          * of the DOCControl register's location, in case we later decide
1435          * that it's not a DiskOnChip, and want to put it back how we
1436          * found it.
1437          */
1438         save_control = ReadDOC(virtadr, DOCControl);
1439 
1440         /* Reset the DiskOnChip ASIC */
1441         WriteDOC(DOC_MODE_CLR_ERR | DOC_MODE_MDWREN | DOC_MODE_RESET, virtadr, DOCControl);
1442         WriteDOC(DOC_MODE_CLR_ERR | DOC_MODE_MDWREN | DOC_MODE_RESET, virtadr, DOCControl);
1443 
1444         /* Enable the DiskOnChip ASIC */
1445         WriteDOC(DOC_MODE_CLR_ERR | DOC_MODE_MDWREN | DOC_MODE_NORMAL, virtadr, DOCControl);
1446         WriteDOC(DOC_MODE_CLR_ERR | DOC_MODE_MDWREN | DOC_MODE_NORMAL, virtadr, DOCControl);
1447 
1448         ChipID = ReadDOC(virtadr, ChipID);
1449 
1450         switch (ChipID) {
1451         case DOC_ChipID_Doc2k:
1452                 reg = DoC_2k_ECCStatus;
1453                 break;
1454         case DOC_ChipID_DocMil:
1455                 reg = DoC_ECCConf;
1456                 break;
1457         case DOC_ChipID_DocMilPlus16:
1458         case DOC_ChipID_DocMilPlus32:
1459         case 0:
1460                 /* Possible Millennium Plus, need to do more checks */
1461                 /* Possibly release from power down mode */
1462                 for (tmp = 0; (tmp < 4); tmp++)
1463                         ReadDOC(virtadr, Mplus_Power);
1464 
1465                 /* Reset the Millennium Plus ASIC */
1466                 tmp = DOC_MODE_RESET | DOC_MODE_MDWREN | DOC_MODE_RST_LAT | DOC_MODE_BDECT;
1467                 WriteDOC(tmp, virtadr, Mplus_DOCControl);
1468                 WriteDOC(~tmp, virtadr, Mplus_CtrlConfirm);
1469 
1470                 usleep_range(1000, 2000);
1471                 /* Enable the Millennium Plus ASIC */
1472                 tmp = DOC_MODE_NORMAL | DOC_MODE_MDWREN | DOC_MODE_RST_LAT | DOC_MODE_BDECT;
1473                 WriteDOC(tmp, virtadr, Mplus_DOCControl);
1474                 WriteDOC(~tmp, virtadr, Mplus_CtrlConfirm);
1475                 usleep_range(1000, 2000);
1476 
1477                 ChipID = ReadDOC(virtadr, ChipID);
1478 
1479                 switch (ChipID) {
1480                 case DOC_ChipID_DocMilPlus16:
1481                         reg = DoC_Mplus_Toggle;
1482                         break;
1483                 case DOC_ChipID_DocMilPlus32:
1484                         pr_err("DiskOnChip Millennium Plus 32MB is not supported, ignoring.\n");
1485                         /* fall through */
1486                 default:
1487                         ret = -ENODEV;
1488                         goto notfound;
1489                 }
1490                 break;
1491 
1492         default:
1493                 ret = -ENODEV;
1494                 goto notfound;
1495         }
1496         /* Check the TOGGLE bit in the ECC register */
1497         tmp = ReadDOC_(virtadr, reg) & DOC_TOGGLE_BIT;
1498         tmpb = ReadDOC_(virtadr, reg) & DOC_TOGGLE_BIT;
1499         tmpc = ReadDOC_(virtadr, reg) & DOC_TOGGLE_BIT;
1500         if ((tmp == tmpb) || (tmp != tmpc)) {
1501                 pr_warn("Possible DiskOnChip at 0x%lx failed TOGGLE test, dropping.\n", physadr);
1502                 ret = -ENODEV;
1503                 goto notfound;
1504         }
1505 
1506         for (mtd = doclist; mtd; mtd = doc->nextdoc) {
1507                 unsigned char oldval;
1508                 unsigned char newval;
1509                 nand = mtd_to_nand(mtd);
1510                 doc = nand_get_controller_data(nand);
1511                 /* Use the alias resolution register to determine if this is
1512                    in fact the same DOC aliased to a new address.  If writes
1513                    to one chip's alias resolution register change the value on
1514                    the other chip, they're the same chip. */
1515                 if (ChipID == DOC_ChipID_DocMilPlus16) {
1516                         oldval = ReadDOC(doc->virtadr, Mplus_AliasResolution);
1517                         newval = ReadDOC(virtadr, Mplus_AliasResolution);
1518                 } else {
1519                         oldval = ReadDOC(doc->virtadr, AliasResolution);
1520                         newval = ReadDOC(virtadr, AliasResolution);
1521                 }
1522                 if (oldval != newval)
1523                         continue;
1524                 if (ChipID == DOC_ChipID_DocMilPlus16) {
1525                         WriteDOC(~newval, virtadr, Mplus_AliasResolution);
1526                         oldval = ReadDOC(doc->virtadr, Mplus_AliasResolution);
1527                         WriteDOC(newval, virtadr, Mplus_AliasResolution);       // restore it
1528                 } else {
1529                         WriteDOC(~newval, virtadr, AliasResolution);
1530                         oldval = ReadDOC(doc->virtadr, AliasResolution);
1531                         WriteDOC(newval, virtadr, AliasResolution);     // restore it
1532                 }
1533                 newval = ~newval;
1534                 if (oldval == newval) {
1535                         pr_debug("Found alias of DOC at 0x%lx to 0x%lx\n",
1536                                  doc->physadr, physadr);
1537                         goto notfound;
1538                 }
1539         }
1540 
1541         pr_notice("DiskOnChip found at 0x%lx\n", physadr);
1542 
1543         len = sizeof(struct nand_chip) + sizeof(struct doc_priv) +
1544               (2 * sizeof(struct nand_bbt_descr));
1545         nand = kzalloc(len, GFP_KERNEL);
1546         if (!nand) {
1547                 ret = -ENOMEM;
1548                 goto fail;
1549         }
1550 
1551 
1552         /*
1553          * Allocate a RS codec instance
1554          *
1555          * Symbolsize is 10 (bits)
1556          * Primitve polynomial is x^10+x^3+1
1557          * First consecutive root is 510
1558          * Primitve element to generate roots = 1
1559          * Generator polinomial degree = 4
1560          */
1561         doc = (struct doc_priv *) (nand + 1);
1562         doc->rs_decoder = init_rs(10, 0x409, FCR, 1, NROOTS);
1563         if (!doc->rs_decoder) {
1564                 pr_err("DiskOnChip: Could not create a RS codec\n");
1565                 ret = -ENOMEM;
1566                 goto fail;
1567         }
1568 
1569         mtd                     = nand_to_mtd(nand);
1570         nand->bbt_td            = (struct nand_bbt_descr *) (doc + 1);
1571         nand->bbt_md            = nand->bbt_td + 1;
1572 
1573         mtd->owner              = THIS_MODULE;
1574         mtd_set_ooblayout(mtd, &doc200x_ooblayout_ops);
1575 
1576         nand_set_controller_data(nand, doc);
1577         nand->legacy.select_chip        = doc200x_select_chip;
1578         nand->legacy.cmd_ctrl           = doc200x_hwcontrol;
1579         nand->legacy.dev_ready  = doc200x_dev_ready;
1580         nand->legacy.waitfunc   = doc200x_wait;
1581         nand->legacy.block_bad  = doc200x_block_bad;
1582         nand->ecc.hwctl         = doc200x_enable_hwecc;
1583         nand->ecc.calculate     = doc200x_calculate_ecc;
1584         nand->ecc.correct       = doc200x_correct_data;
1585 
1586         nand->ecc.mode          = NAND_ECC_HW_SYNDROME;
1587         nand->ecc.size          = 512;
1588         nand->ecc.bytes         = 6;
1589         nand->ecc.strength      = 2;
1590         nand->ecc.options       = NAND_ECC_GENERIC_ERASED_CHECK;
1591         nand->bbt_options       = NAND_BBT_USE_FLASH;
1592         /* Skip the automatic BBT scan so we can run it manually */
1593         nand->options           |= NAND_SKIP_BBTSCAN;
1594 
1595         doc->physadr            = physadr;
1596         doc->virtadr            = virtadr;
1597         doc->ChipID             = ChipID;
1598         doc->curfloor           = -1;
1599         doc->curchip            = -1;
1600         doc->mh0_page           = -1;
1601         doc->mh1_page           = -1;
1602         doc->nextdoc            = doclist;
1603 
1604         if (ChipID == DOC_ChipID_Doc2k)
1605                 numchips = doc2000_init(mtd);
1606         else if (ChipID == DOC_ChipID_DocMilPlus16)
1607                 numchips = doc2001plus_init(mtd);
1608         else
1609                 numchips = doc2001_init(mtd);
1610 
1611         if ((ret = nand_scan(nand, numchips)) || (ret = doc->late_init(mtd))) {
1612                 /* DBB note: i believe nand_release is necessary here, as
1613                    buffers may have been allocated in nand_base.  Check with
1614                    Thomas. FIX ME! */
1615                 /* nand_release will call mtd_device_unregister, but we
1616                    haven't yet added it.  This is handled without incident by
1617                    mtd_device_unregister, as far as I can tell. */
1618                 nand_release(nand);
1619                 goto fail;
1620         }
1621 
1622         /* Success! */
1623         doclist = mtd;
1624         return 0;
1625 
1626  notfound:
1627         /* Put back the contents of the DOCControl register, in case it's not
1628            actually a DiskOnChip.  */
1629         WriteDOC(save_control, virtadr, DOCControl);
1630  fail:
1631         if (doc)
1632                 free_rs(doc->rs_decoder);
1633         kfree(nand);
1634         iounmap(virtadr);
1635 
1636 error_ioremap:
1637         release_mem_region(physadr, DOC_IOREMAP_LEN);
1638 
1639         return ret;
1640 }
1641 
1642 static void release_nanddoc(void)
1643 {
1644         struct mtd_info *mtd, *nextmtd;
1645         struct nand_chip *nand;
1646         struct doc_priv *doc;
1647 
1648         for (mtd = doclist; mtd; mtd = nextmtd) {
1649                 nand = mtd_to_nand(mtd);
1650                 doc = nand_get_controller_data(nand);
1651 
1652                 nextmtd = doc->nextdoc;
1653                 nand_release(nand);
1654                 iounmap(doc->virtadr);
1655                 release_mem_region(doc->physadr, DOC_IOREMAP_LEN);
1656                 free_rs(doc->rs_decoder);
1657                 kfree(nand);
1658         }
1659 }
1660 
1661 static int __init init_nanddoc(void)
1662 {
1663         int i, ret = 0;
1664 
1665         if (doc_config_location) {
1666                 pr_info("Using configured DiskOnChip probe address 0x%lx\n",
1667                         doc_config_location);
1668                 ret = doc_probe(doc_config_location);
1669                 if (ret < 0)
1670                         return ret;
1671         } else {
1672                 for (i = 0; (doc_locations[i] != 0xffffffff); i++) {
1673                         doc_probe(doc_locations[i]);
1674                 }
1675         }
1676         /* No banner message any more. Print a message if no DiskOnChip
1677            found, so the user knows we at least tried. */
1678         if (!doclist) {
1679                 pr_info("No valid DiskOnChip devices found\n");
1680                 ret = -ENODEV;
1681         }
1682         return ret;
1683 }
1684 
1685 static void __exit cleanup_nanddoc(void)
1686 {
1687         /* Cleanup the nand/DoC resources */
1688         release_nanddoc();
1689 }
1690 
1691 module_init(init_nanddoc);
1692 module_exit(cleanup_nanddoc);
1693 
1694 MODULE_LICENSE("GPL");
1695 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
1696 MODULE_DESCRIPTION("M-Systems DiskOnChip 2000, Millennium and Millennium Plus device driver");
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/mtd/nand/raw/diskonchip.c

DEFINITIONS
