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   1 /* linux/drivers/mtd/nand/s3c2410.c
   2  *
   3  * Copyright (c) 2004,2005 Simtec Electronics
   4  *      http://www.simtec.co.uk/products/SWLINUX/
   5  *      Ben Dooks <ben@simtec.co.uk>
   6  *
   7  * Samsung S3C2410/S3C240 NAND driver
   8  *
   9  * Changelog:
  10  *      21-Sep-2004  BJD  Initial version
  11  *      23-Sep-2004  BJD  Multiple device support
  12  *      28-Sep-2004  BJD  Fixed ECC placement for Hardware mode
  13  *      12-Oct-2004  BJD  Fixed errors in use of platform data
  14  *      18-Feb-2005  BJD  Fix sparse errors
  15  *      14-Mar-2005  BJD  Applied tglx's code reduction patch
  16  *      02-May-2005  BJD  Fixed s3c2440 support
  17  *      02-May-2005  BJD  Reduced hwcontrol decode
  18  *      20-Jun-2005  BJD  Updated s3c2440 support, fixed timing bug
  19  *      08-Jul-2005  BJD  Fix OOPS when no platform data supplied
  20  *      20-Oct-2005  BJD  Fix timing calculation bug
  21  *      14-Jan-2006  BJD  Allow clock to be stopped when idle
  22  *
  23  * $Id: s3c2410.c,v 1.23 2006/04/01 18:06:29 bjd Exp $
  24  *
  25  * This program is free software; you can redistribute it and/or modify
  26  * it under the terms of the GNU General Public License as published by
  27  * the Free Software Foundation; either version 2 of the License, or
  28  * (at your option) any later version.
  29  *
  30  * This program is distributed in the hope that it will be useful,
  31  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  32  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  33  * GNU General Public License for more details.
  34  *
  35  * You should have received a copy of the GNU General Public License
  36  * along with this program; if not, write to the Free Software
  37  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  38 */
  39
  40 #ifdef CONFIG_MTD_NAND_S3C2410_DEBUG
  41 #define DEBUG
  42 #endif
  43
  44 #include <linux/module.h>
  45 #include <linux/types.h>
  46 #include <linux/init.h>
  47 #include <linux/kernel.h>
  48 #include <linux/string.h>
  49 #include <linux/ioport.h>
  50 #include <linux/platform_device.h>
  51 #include <linux/delay.h>
  52 #include <linux/err.h>
  53 #include <linux/slab.h>
  54 #include <linux/clk.h>
  55
  56 #include <linux/mtd/mtd.h>
  57 #include <linux/mtd/nand.h>
  58 #include <linux/mtd/nand_ecc.h>
  59 #include <linux/mtd/partitions.h>
  60
  61 #include <asm/io.h>
  62
  63 #include <asm/plat-s3c/regs-nand.h>
  64 #include <asm/plat-s3c/nand.h>
  65
  66 #ifdef CONFIG_MTD_NAND_S3C2410_HWECC
  67 static int hardware_ecc = 1;
  68 #else
  69 static int hardware_ecc = 0;
  70 #endif
  71
  72 #ifdef CONFIG_MTD_NAND_S3C2410_CLKSTOP
  73 static int clock_stop = 1;
  74 #else
  75 static const int clock_stop = 0;
  76 #endif
  77
  78
  79 /* new oob placement block for use with hardware ecc generation
  80  */
  81
  82 static struct nand_ecclayout nand_hw_eccoob = {
  83         .eccbytes = 3,
  84         .eccpos = {0, 1, 2},
  85         .oobfree = {{8, 8}}
  86 };
  87
  88 /* controller and mtd information */
  89
  90 struct s3c2410_nand_info;
  91
  92 struct s3c2410_nand_mtd {
  93         struct mtd_info                 mtd;
  94         struct nand_chip                chip;
  95         struct s3c2410_nand_set         *set;
  96         struct s3c2410_nand_info        *info;
  97         int                             scan_res;
  98 };
  99
 100 enum s3c_cpu_type {
 101         TYPE_S3C2410,
 102         TYPE_S3C2412,
 103         TYPE_S3C2440,
 104 };
 105
 106 /* overview of the s3c2410 nand state */
 107
 108 struct s3c2410_nand_info {
 109         /* mtd info */
 110         struct nand_hw_control          controller;
 111         struct s3c2410_nand_mtd         *mtds;
 112         struct s3c2410_platform_nand    *platform;
 113
 114         /* device info */
 115         struct device                   *device;
 116         struct resource                 *area;
 117         struct clk                      *clk;
 118         void __iomem                    *regs;
 119         void __iomem                    *sel_reg;
 120         int                             sel_bit;
 121         int                             mtd_count;
 122         unsigned long                   save_sel;
 123
 124         enum s3c_cpu_type               cpu_type;
 125 };
 126
 127 /* conversion functions */
 128
 129 static struct s3c2410_nand_mtd *s3c2410_nand_mtd_toours(struct mtd_info *mtd)
 130 {
 131         return container_of(mtd, struct s3c2410_nand_mtd, mtd);
 132 }
 133
 134 static struct s3c2410_nand_info *s3c2410_nand_mtd_toinfo(struct mtd_info *mtd)
 135 {
 136         return s3c2410_nand_mtd_toours(mtd)->info;
 137 }
 138
 139 static struct s3c2410_nand_info *to_nand_info(struct platform_device *dev)
 140 {
 141         return platform_get_drvdata(dev);
 142 }
 143
 144 static struct s3c2410_platform_nand *to_nand_plat(struct platform_device *dev)
 145 {
 146         return dev->dev.platform_data;
 147 }
 148
 149 static inline int allow_clk_stop(struct s3c2410_nand_info *info)
 150 {
 151         return clock_stop;
 152 }
 153
 154 /* timing calculations */
 155
 156 #define NS_IN_KHZ 1000000
 157
 158 static int s3c_nand_calc_rate(int wanted, unsigned long clk, int max)
 159 {
 160         int result;
 161
 162         result = (wanted * clk) / NS_IN_KHZ;
 163         result++;
 164
 165         pr_debug("result %d from %ld, %d\n", result, clk, wanted);
 166
 167         if (result > max) {
 168                 printk("%d ns is too big for current clock rate %ld\n", wanted, clk);
 169                 return -1;
 170         }
 171
 172         if (result < 1)
 173                 result = 1;
 174
 175         return result;
 176 }
 177
 178 #define to_ns(ticks,clk) (((ticks) * NS_IN_KHZ) / (unsigned int)(clk))
 179
 180 /* controller setup */
 181
 182 static int s3c2410_nand_inithw(struct s3c2410_nand_info *info,
 183                                struct platform_device *pdev)
 184 {
 185         struct s3c2410_platform_nand *plat = to_nand_plat(pdev);
 186         unsigned long clkrate = clk_get_rate(info->clk);
 187         int tacls_max = (info->cpu_type == TYPE_S3C2412) ? 8 : 4;
 188         int tacls, twrph0, twrph1;
 189         unsigned long cfg = 0;
 190
 191         /* calculate the timing information for the controller */
 192
 193         clkrate /= 1000;        /* turn clock into kHz for ease of use */
 194
 195         if (plat != NULL) {
 196                 tacls = s3c_nand_calc_rate(plat->tacls, clkrate, tacls_max);
 197                 twrph0 = s3c_nand_calc_rate(plat->twrph0, clkrate, 8);
 198                 twrph1 = s3c_nand_calc_rate(plat->twrph1, clkrate, 8);
 199         } else {
 200                 /* default timings */
 201                 tacls = tacls_max;
 202                 twrph0 = 8;
 203                 twrph1 = 8;
 204         }
 205
 206         if (tacls < 0 || twrph0 < 0 || twrph1 < 0) {
 207                 dev_err(info->device, "cannot get suitable timings\n");
 208                 return -EINVAL;
 209         }
 210
 211         dev_info(info->device, "Tacls=%d, %dns Twrph0=%d %dns, Twrph1=%d %dns\n",
 212                tacls, to_ns(tacls, clkrate), twrph0, to_ns(twrph0, clkrate), twrph1, to_ns(twrph1, clkrate));
 213
 214         switch (info->cpu_type) {
 215         case TYPE_S3C2410:
 216                 cfg = S3C2410_NFCONF_EN;
 217                 cfg |= S3C2410_NFCONF_TACLS(tacls - 1);
 218                 cfg |= S3C2410_NFCONF_TWRPH0(twrph0 - 1);
 219                 cfg |= S3C2410_NFCONF_TWRPH1(twrph1 - 1);
 220                 break;
 221
 222         case TYPE_S3C2440:
 223         case TYPE_S3C2412:
 224                 cfg = S3C2440_NFCONF_TACLS(tacls - 1);
 225                 cfg |= S3C2440_NFCONF_TWRPH0(twrph0 - 1);
 226                 cfg |= S3C2440_NFCONF_TWRPH1(twrph1 - 1);
 227
 228                 /* enable the controller and de-assert nFCE */
 229
 230                 writel(S3C2440_NFCONT_ENABLE, info->regs + S3C2440_NFCONT);
 231         }
 232
 233         dev_dbg(info->device, "NF_CONF is 0x%lx\n", cfg);
 234
 235         writel(cfg, info->regs + S3C2410_NFCONF);
 236         return 0;
 237 }
 238
 239 /* select chip */
 240
 241 static void s3c2410_nand_select_chip(struct mtd_info *mtd, int chip)
 242 {
 243         struct s3c2410_nand_info *info;
 244         struct s3c2410_nand_mtd *nmtd;
 245         struct nand_chip *this = mtd->priv;
 246         unsigned long cur;
 247
 248         nmtd = this->priv;
 249         info = nmtd->info;
 250
 251         if (chip != -1 && allow_clk_stop(info))
 252                 clk_enable(info->clk);
 253
 254         cur = readl(info->sel_reg);
 255
 256         if (chip == -1) {
 257                 cur |= info->sel_bit;
 258         } else {
 259                 if (nmtd->set != NULL && chip > nmtd->set->nr_chips) {
 260                         dev_err(info->device, "invalid chip %d\n", chip);
 261                         return;
 262                 }
 263
 264                 if (info->platform != NULL) {
 265                         if (info->platform->select_chip != NULL)
 266                                 (info->platform->select_chip) (nmtd->set, chip);
 267                 }
 268
 269                 cur &= ~info->sel_bit;
 270         }
 271
 272         writel(cur, info->sel_reg);
 273
 274         if (chip == -1 && allow_clk_stop(info))
 275                 clk_disable(info->clk);
 276 }
 277
 278 /* s3c2410_nand_hwcontrol
 279  *
 280  * Issue command and address cycles to the chip
 281 */
 282
 283 static void s3c2410_nand_hwcontrol(struct mtd_info *mtd, int cmd,
 284                                    unsigned int ctrl)
 285 {
 286         struct s3c2410_nand_info *info = s3c2410_nand_mtd_toinfo(mtd);
 287
 288         if (cmd == NAND_CMD_NONE)
 289                 return;
 290
 291         if (ctrl & NAND_CLE)
 292                 writeb(cmd, info->regs + S3C2410_NFCMD);
 293         else
 294                 writeb(cmd, info->regs + S3C2410_NFADDR);
 295 }
 296
 297 /* command and control functions */
 298
 299 static void s3c2440_nand_hwcontrol(struct mtd_info *mtd, int cmd,
 300                                    unsigned int ctrl)
 301 {
 302         struct s3c2410_nand_info *info = s3c2410_nand_mtd_toinfo(mtd);
 303
 304         if (cmd == NAND_CMD_NONE)
 305                 return;
 306
 307         if (ctrl & NAND_CLE)
 308                 writeb(cmd, info->regs + S3C2440_NFCMD);
 309         else
 310                 writeb(cmd, info->regs + S3C2440_NFADDR);
 311 }
 312
 313 /* s3c2410_nand_devready()
 314  *
 315  * returns 0 if the nand is busy, 1 if it is ready
 316 */
 317
 318 static int s3c2410_nand_devready(struct mtd_info *mtd)
 319 {
 320         struct s3c2410_nand_info *info = s3c2410_nand_mtd_toinfo(mtd);
 321         return readb(info->regs + S3C2410_NFSTAT) & S3C2410_NFSTAT_BUSY;
 322 }
 323
 324 static int s3c2440_nand_devready(struct mtd_info *mtd)
 325 {
 326         struct s3c2410_nand_info *info = s3c2410_nand_mtd_toinfo(mtd);
 327         return readb(info->regs + S3C2440_NFSTAT) & S3C2440_NFSTAT_READY;
 328 }
 329
 330 static int s3c2412_nand_devready(struct mtd_info *mtd)
 331 {
 332         struct s3c2410_nand_info *info = s3c2410_nand_mtd_toinfo(mtd);
 333         return readb(info->regs + S3C2412_NFSTAT) & S3C2412_NFSTAT_READY;
 334 }
 335
 336 /* ECC handling functions */
 337
 338 static int s3c2410_nand_correct_data(struct mtd_info *mtd, u_char *dat,
 339                                      u_char *read_ecc, u_char *calc_ecc)
 340 {
 341         struct s3c2410_nand_info *info = s3c2410_nand_mtd_toinfo(mtd);
 342         unsigned int diff0, diff1, diff2;
 343         unsigned int bit, byte;
 344
 345         pr_debug("%s(%p,%p,%p,%p)\n", __func__, mtd, dat, read_ecc, calc_ecc);
 346
 347         diff0 = read_ecc[0] ^ calc_ecc[0];
 348         diff1 = read_ecc[1] ^ calc_ecc[1];
 349         diff2 = read_ecc[2] ^ calc_ecc[2];
 350
 351         pr_debug("%s: rd %02x%02x%02x calc %02x%02x%02x diff %02x%02x%02x\n",
 352                  __func__,
 353                  read_ecc[0], read_ecc[1], read_ecc[2],
 354                  calc_ecc[0], calc_ecc[1], calc_ecc[2],
 355                  diff0, diff1, diff2);
 356
 357         if (diff0 == 0 && diff1 == 0 && diff2 == 0)
 358                 return 0;               /* ECC is ok */
 359
 360         /* sometimes people do not think about using the ECC, so check
 361          * to see if we have an 0xff,0xff,0xff read ECC and then ignore
 362          * the error, on the assumption that this is an un-eccd page.
 363          */
 364         if (read_ecc[0] == 0xff && read_ecc[1] == 0xff && read_ecc[2] == 0xff
 365             && info->platform->ignore_unset_ecc)
 366                 return 0;
 367
 368         /* Can we correct this ECC (ie, one row and column change).
 369          * Note, this is similar to the 256 error code on smartmedia */
 370
 371         if (((diff0 ^ (diff0 >> 1)) & 0x55) == 0x55 &&
 372             ((diff1 ^ (diff1 >> 1)) & 0x55) == 0x55 &&
 373             ((diff2 ^ (diff2 >> 1)) & 0x55) == 0x55) {
 374                 /* calculate the bit position of the error */
 375
 376                 bit  = ((diff2 >> 3) & 1) |
 377                        ((diff2 >> 4) & 2) |
 378                        ((diff2 >> 5) & 4);
 379
 380                 /* calculate the byte position of the error */
 381
 382                 byte = ((diff2 << 7) & 0x100) |
 383                        ((diff1 << 0) & 0x80)  |
 384                        ((diff1 << 1) & 0x40)  |
 385                        ((diff1 << 2) & 0x20)  |
 386                        ((diff1 << 3) & 0x10)  |
 387                        ((diff0 >> 4) & 0x08)  |
 388                        ((diff0 >> 3) & 0x04)  |
 389                        ((diff0 >> 2) & 0x02)  |
 390                        ((diff0 >> 1) & 0x01);
 391
 392                 dev_dbg(info->device, "correcting error bit %d, byte %d\n",
 393                         bit, byte);
 394
 395                 dat[byte] ^= (1 << bit);
 396                 return 1;
 397         }
 398
 399         /* if there is only one bit difference in the ECC, then
 400          * one of only a row or column parity has changed, which
 401          * means the error is most probably in the ECC itself */
 402
 403         diff0 |= (diff1 << 8);
 404         diff0 |= (diff2 << 16);
 405
 406         if ((diff0 & ~(1<<fls(diff0))) == 0)
 407                 return 1;
 408
 409         return -1;
 410 }
 411
 412 /* ECC functions
 413  *
 414  * These allow the s3c2410 and s3c2440 to use the controller's ECC
 415  * generator block to ECC the data as it passes through]
 416 */
 417
 418 static void s3c2410_nand_enable_hwecc(struct mtd_info *mtd, int mode)
 419 {
 420         struct s3c2410_nand_info *info = s3c2410_nand_mtd_toinfo(mtd);
 421         unsigned long ctrl;
 422
 423         ctrl = readl(info->regs + S3C2410_NFCONF);
 424         ctrl |= S3C2410_NFCONF_INITECC;
 425         writel(ctrl, info->regs + S3C2410_NFCONF);
 426 }
 427
 428 static void s3c2412_nand_enable_hwecc(struct mtd_info *mtd, int mode)
 429 {
 430         struct s3c2410_nand_info *info = s3c2410_nand_mtd_toinfo(mtd);
 431         unsigned long ctrl;
 432
 433         ctrl = readl(info->regs + S3C2440_NFCONT);
 434         writel(ctrl | S3C2412_NFCONT_INIT_MAIN_ECC, info->regs + S3C2440_NFCONT);
 435 }
 436
 437 static void s3c2440_nand_enable_hwecc(struct mtd_info *mtd, int mode)
 438 {
 439         struct s3c2410_nand_info *info = s3c2410_nand_mtd_toinfo(mtd);
 440         unsigned long ctrl;
 441
 442         ctrl = readl(info->regs + S3C2440_NFCONT);
 443         writel(ctrl | S3C2440_NFCONT_INITECC, info->regs + S3C2440_NFCONT);
 444 }
 445
 446 static int s3c2410_nand_calculate_ecc(struct mtd_info *mtd, const u_char *dat, u_char *ecc_code)
 447 {
 448         struct s3c2410_nand_info *info = s3c2410_nand_mtd_toinfo(mtd);
 449
 450         ecc_code[0] = readb(info->regs + S3C2410_NFECC + 0);
 451         ecc_code[1] = readb(info->regs + S3C2410_NFECC + 1);
 452         ecc_code[2] = readb(info->regs + S3C2410_NFECC + 2);
 453
 454         pr_debug("%s: returning ecc %02x%02x%02x\n", __func__,
 455                  ecc_code[0], ecc_code[1], ecc_code[2]);
 456
 457         return 0;
 458 }
 459
 460 static int s3c2412_nand_calculate_ecc(struct mtd_info *mtd, const u_char *dat, u_char *ecc_code)
 461 {
 462         struct s3c2410_nand_info *info = s3c2410_nand_mtd_toinfo(mtd);
 463         unsigned long ecc = readl(info->regs + S3C2412_NFMECC0);
 464
 465         ecc_code[0] = ecc;
 466         ecc_code[1] = ecc >> 8;
 467         ecc_code[2] = ecc >> 16;
 468
 469         pr_debug("calculate_ecc: returning ecc %02x,%02x,%02x\n", ecc_code[0], ecc_code[1], ecc_code[2]);
 470
 471         return 0;
 472 }
 473
 474 static int s3c2440_nand_calculate_ecc(struct mtd_info *mtd, const u_char *dat, u_char *ecc_code)
 475 {
 476         struct s3c2410_nand_info *info = s3c2410_nand_mtd_toinfo(mtd);
 477         unsigned long ecc = readl(info->regs + S3C2440_NFMECC0);
 478
 479         ecc_code[0] = ecc;
 480         ecc_code[1] = ecc >> 8;
 481         ecc_code[2] = ecc >> 16;
 482
 483         pr_debug("%s: returning ecc %06lx\n", __func__, ecc & 0xffffff);
 484
 485         return 0;
 486 }
 487
 488 /* over-ride the standard functions for a little more speed. We can
 489  * use read/write block to move the data buffers to/from the controller
 490 */
 491
 492 static void s3c2410_nand_read_buf(struct mtd_info *mtd, u_char *buf, int len)
 493 {
 494         struct nand_chip *this = mtd->priv;
 495         readsb(this->IO_ADDR_R, buf, len);
 496 }
 497
 498 static void s3c2440_nand_read_buf(struct mtd_info *mtd, u_char *buf, int len)
 499 {
 500         struct s3c2410_nand_info *info = s3c2410_nand_mtd_toinfo(mtd);
 501         readsl(info->regs + S3C2440_NFDATA, buf, len / 4);
 502 }
 503
 504 static void s3c2410_nand_write_buf(struct mtd_info *mtd, const u_char *buf, int len)
 505 {
 506         struct nand_chip *this = mtd->priv;
 507         writesb(this->IO_ADDR_W, buf, len);
 508 }
 509
 510 static void s3c2440_nand_write_buf(struct mtd_info *mtd, const u_char *buf, int len)
 511 {
 512         struct s3c2410_nand_info *info = s3c2410_nand_mtd_toinfo(mtd);
 513         writesl(info->regs + S3C2440_NFDATA, buf, len / 4);
 514 }
 515
 516 /* device management functions */
 517
 518 static int s3c2410_nand_remove(struct platform_device *pdev)
 519 {
 520         struct s3c2410_nand_info *info = to_nand_info(pdev);
 521
 522         platform_set_drvdata(pdev, NULL);
 523
 524         if (info == NULL)
 525                 return 0;
 526
 527         /* first thing we need to do is release all our mtds
 528          * and their partitions, then go through freeing the
 529          * resources used
 530          */
 531
 532         if (info->mtds != NULL) {
 533                 struct s3c2410_nand_mtd *ptr = info->mtds;
 534                 int mtdno;
 535
 536                 for (mtdno = 0; mtdno < info->mtd_count; mtdno++, ptr++) {
 537                         pr_debug("releasing mtd %d (%p)\n", mtdno, ptr);
 538                         nand_release(&ptr->mtd);
 539                 }
 540
 541                 kfree(info->mtds);
 542         }
 543
 544         /* free the common resources */
 545
 546         if (info->clk != NULL && !IS_ERR(info->clk)) {
 547                 if (!allow_clk_stop(info))
 548                         clk_disable(info->clk);
 549                 clk_put(info->clk);
 550         }
 551
 552         if (info->regs != NULL) {
 553                 iounmap(info->regs);
 554                 info->regs = NULL;
 555         }
 556
 557         if (info->area != NULL) {
 558                 release_resource(info->area);
 559                 kfree(info->area);
 560                 info->area = NULL;
 561         }
 562
 563         kfree(info);
 564
 565         return 0;
 566 }
 567
 568 #ifdef CONFIG_MTD_PARTITIONS
 569 static int s3c2410_nand_add_partition(struct s3c2410_nand_info *info,
 570                                       struct s3c2410_nand_mtd *mtd,
 571                                       struct s3c2410_nand_set *set)
 572 {
 573         if (set == NULL)
 574                 return add_mtd_device(&mtd->mtd);
 575
 576         if (set->nr_partitions > 0 && set->partitions != NULL) {
 577                 return add_mtd_partitions(&mtd->mtd, set->partitions, set->nr_partitions);
 578         }
 579
 580         return add_mtd_device(&mtd->mtd);
 581 }
 582 #else
 583 static int s3c2410_nand_add_partition(struct s3c2410_nand_info *info,
 584                                       struct s3c2410_nand_mtd *mtd,
 585                                       struct s3c2410_nand_set *set)
 586 {
 587         return add_mtd_device(&mtd->mtd);
 588 }
 589 #endif
 590
 591 /* s3c2410_nand_init_chip
 592  *
 593  * init a single instance of an chip
 594 */
 595
 596 static void s3c2410_nand_init_chip(struct s3c2410_nand_info *info,
 597                                    struct s3c2410_nand_mtd *nmtd,
 598                                    struct s3c2410_nand_set *set)
 599 {
 600         struct nand_chip *chip = &nmtd->chip;
 601         void __iomem *regs = info->regs;
 602
 603         chip->write_buf    = s3c2410_nand_write_buf;
 604         chip->read_buf     = s3c2410_nand_read_buf;
 605         chip->select_chip  = s3c2410_nand_select_chip;
 606         chip->chip_delay   = 50;
 607         chip->priv         = nmtd;
 608         chip->options      = 0;
 609         chip->controller   = &info->controller;
 610
 611         switch (info->cpu_type) {
 612         case TYPE_S3C2410:
 613                 chip->IO_ADDR_W = regs + S3C2410_NFDATA;
 614                 info->sel_reg   = regs + S3C2410_NFCONF;
 615                 info->sel_bit   = S3C2410_NFCONF_nFCE;
 616                 chip->cmd_ctrl  = s3c2410_nand_hwcontrol;
 617                 chip->dev_ready = s3c2410_nand_devready;
 618                 break;
 619
 620         case TYPE_S3C2440:
 621                 chip->IO_ADDR_W = regs + S3C2440_NFDATA;
 622                 info->sel_reg   = regs + S3C2440_NFCONT;
 623                 info->sel_bit   = S3C2440_NFCONT_nFCE;
 624                 chip->cmd_ctrl  = s3c2440_nand_hwcontrol;
 625                 chip->dev_ready = s3c2440_nand_devready;
 626                 chip->read_buf  = s3c2440_nand_read_buf;
 627                 chip->write_buf = s3c2440_nand_write_buf;
 628                 break;
 629
 630         case TYPE_S3C2412:
 631                 chip->IO_ADDR_W = regs + S3C2440_NFDATA;
 632                 info->sel_reg   = regs + S3C2440_NFCONT;
 633                 info->sel_bit   = S3C2412_NFCONT_nFCE0;
 634                 chip->cmd_ctrl  = s3c2440_nand_hwcontrol;
 635                 chip->dev_ready = s3c2412_nand_devready;
 636
 637                 if (readl(regs + S3C2410_NFCONF) & S3C2412_NFCONF_NANDBOOT)
 638                         dev_info(info->device, "System booted from NAND\n");
 639
 640                 break;
 641         }
 642
 643         chip->IO_ADDR_R = chip->IO_ADDR_W;
 644
 645         nmtd->info         = info;
 646         nmtd->mtd.priv     = chip;
 647         nmtd->mtd.owner    = THIS_MODULE;
 648         nmtd->set          = set;
 649
 650         if (hardware_ecc) {
 651                 chip->ecc.calculate = s3c2410_nand_calculate_ecc;
 652                 chip->ecc.correct   = s3c2410_nand_correct_data;
 653                 chip->ecc.mode      = NAND_ECC_HW;
 654
 655                 switch (info->cpu_type) {
 656                 case TYPE_S3C2410:
 657                         chip->ecc.hwctl     = s3c2410_nand_enable_hwecc;
 658                         chip->ecc.calculate = s3c2410_nand_calculate_ecc;
 659                         break;
 660
 661                 case TYPE_S3C2412:
 662                         chip->ecc.hwctl     = s3c2412_nand_enable_hwecc;
 663                         chip->ecc.calculate = s3c2412_nand_calculate_ecc;
 664                         break;
 665
 666                 case TYPE_S3C2440:
 667                         chip->ecc.hwctl     = s3c2440_nand_enable_hwecc;
 668                         chip->ecc.calculate = s3c2440_nand_calculate_ecc;
 669                         break;
 670
 671                 }
 672         } else {
 673                 chip->ecc.mode      = NAND_ECC_SOFT;
 674         }
 675
 676         if (set->ecc_layout != NULL)
 677                 chip->ecc.layout = set->ecc_layout;
 678
 679         if (set->disable_ecc)
 680                 chip->ecc.mode  = NAND_ECC_NONE;
 681 }
 682
 683 /* s3c2410_nand_update_chip
 684  *
 685  * post-probe chip update, to change any items, such as the
 686  * layout for large page nand
 687  */
 688
 689 static void s3c2410_nand_update_chip(struct s3c2410_nand_info *info,
 690                                      struct s3c2410_nand_mtd *nmtd)
 691 {
 692         struct nand_chip *chip = &nmtd->chip;
 693
 694         printk("%s: chip %p: %d\n", __func__, chip, chip->page_shift);
 695
 696         if (hardware_ecc) {
 697                 /* change the behaviour depending on wether we are using
 698                  * the large or small page nand device */
 699
 700                 if (chip->page_shift > 10) {
 701                         chip->ecc.size      = 256;
 702                         chip->ecc.bytes     = 3;
 703                 } else {
 704                         chip->ecc.size      = 512;
 705                         chip->ecc.bytes     = 3;
 706                         chip->ecc.layout    = &nand_hw_eccoob;
 707                 }
 708         }
 709 }
 710
 711 /* s3c2410_nand_probe
 712  *
 713  * called by device layer when it finds a device matching
 714  * one our driver can handled. This code checks to see if
 715  * it can allocate all necessary resources then calls the
 716  * nand layer to look for devices
 717 */
 718
 719 static int s3c24xx_nand_probe(struct platform_device *pdev,
 720                               enum s3c_cpu_type cpu_type)
 721 {
 722         struct s3c2410_platform_nand *plat = to_nand_plat(pdev);
 723         struct s3c2410_nand_info *info;
 724         struct s3c2410_nand_mtd *nmtd;
 725         struct s3c2410_nand_set *sets;
 726         struct resource *res;
 727         int err = 0;
 728         int size;
 729         int nr_sets;
 730         int setno;
 731
 732         pr_debug("s3c2410_nand_probe(%p)\n", pdev);
 733
 734         info = kmalloc(sizeof(*info), GFP_KERNEL);
 735         if (info == NULL) {
 736                 dev_err(&pdev->dev, "no memory for flash info\n");
 737                 err = -ENOMEM;
 738                 goto exit_error;
 739         }
 740
 741         memzero(info, sizeof(*info));
 742         platform_set_drvdata(pdev, info);
 743
 744         spin_lock_init(&info->controller.lock);
 745         init_waitqueue_head(&info->controller.wq);
 746
 747         /* get the clock source and enable it */
 748
 749         info->clk = clk_get(&pdev->dev, "nand");
 750         if (IS_ERR(info->clk)) {
 751                 dev_err(&pdev->dev, "failed to get clock\n");
 752                 err = -ENOENT;
 753                 goto exit_error;
 754         }
 755
 756         clk_enable(info->clk);
 757
 758         /* allocate and map the resource */
 759
 760         /* currently we assume we have the one resource */
 761         res  = pdev->resource;
 762         size = res->end - res->start + 1;
 763
 764         info->area = request_mem_region(res->start, size, pdev->name);
 765
 766         if (info->area == NULL) {
 767                 dev_err(&pdev->dev, "cannot reserve register region\n");
 768                 err = -ENOENT;
 769                 goto exit_error;
 770         }
 771
 772         info->device     = &pdev->dev;
 773         info->platform   = plat;
 774         info->regs       = ioremap(res->start, size);
 775         info->cpu_type   = cpu_type;
 776
 777         if (info->regs == NULL) {
 778                 dev_err(&pdev->dev, "cannot reserve register region\n");
 779                 err = -EIO;
 780                 goto exit_error;
 781         }
 782
 783         dev_dbg(&pdev->dev, "mapped registers at %p\n", info->regs);
 784
 785         /* initialise the hardware */
 786
 787         err = s3c2410_nand_inithw(info, pdev);
 788         if (err != 0)
 789                 goto exit_error;
 790
 791         sets = (plat != NULL) ? plat->sets : NULL;
 792         nr_sets = (plat != NULL) ? plat->nr_sets : 1;
 793
 794         info->mtd_count = nr_sets;
 795
 796         /* allocate our information */
 797
 798         size = nr_sets * sizeof(*info->mtds);
 799         info->mtds = kmalloc(size, GFP_KERNEL);
 800         if (info->mtds == NULL) {
 801                 dev_err(&pdev->dev, "failed to allocate mtd storage\n");
 802                 err = -ENOMEM;
 803                 goto exit_error;
 804         }
 805
 806         memzero(info->mtds, size);
 807
 808         /* initialise all possible chips */
 809
 810         nmtd = info->mtds;
 811
 812         for (setno = 0; setno < nr_sets; setno++, nmtd++) {
 813                 pr_debug("initialising set %d (%p, info %p)\n", setno, nmtd, info);
 814
 815                 s3c2410_nand_init_chip(info, nmtd, sets);
 816
 817                 nmtd->scan_res = nand_scan_ident(&nmtd->mtd,
 818                                                  (sets) ? sets->nr_chips : 1);
 819
 820                 if (nmtd->scan_res == 0) {
 821                         s3c2410_nand_update_chip(info, nmtd);
 822                         nand_scan_tail(&nmtd->mtd);
 823                         s3c2410_nand_add_partition(info, nmtd, sets);
 824                 }
 825
 826                 if (sets != NULL)
 827                         sets++;
 828         }
 829
 830         if (allow_clk_stop(info)) {
 831                 dev_info(&pdev->dev, "clock idle support enabled\n");
 832                 clk_disable(info->clk);
 833         }
 834
 835         pr_debug("initialised ok\n");
 836         return 0;
 837
 838  exit_error:
 839         s3c2410_nand_remove(pdev);
 840
 841         if (err == 0)
 842                 err = -EINVAL;
 843         return err;
 844 }
 845
 846 /* PM Support */
 847 #ifdef CONFIG_PM
 848
 849 static int s3c24xx_nand_suspend(struct platform_device *dev, pm_message_t pm)
 850 {
 851         struct s3c2410_nand_info *info = platform_get_drvdata(dev);
 852
 853         if (info) {
 854                 info->save_sel = readl(info->sel_reg);
 855
 856                 /* For the moment, we must ensure nFCE is high during
 857                  * the time we are suspended. This really should be
 858                  * handled by suspending the MTDs we are using, but
 859                  * that is currently not the case. */
 860
 861                 writel(info->save_sel | info->sel_bit, info->sel_reg);
 862
 863                 if (!allow_clk_stop(info))
 864                         clk_disable(info->clk);
 865         }
 866
 867         return 0;
 868 }
 869
 870 static int s3c24xx_nand_resume(struct platform_device *dev)
 871 {
 872         struct s3c2410_nand_info *info = platform_get_drvdata(dev);
 873         unsigned long sel;
 874
 875         if (info) {
 876                 clk_enable(info->clk);
 877                 s3c2410_nand_inithw(info, dev);
 878
 879                 /* Restore the state of the nFCE line. */
 880
 881                 sel = readl(info->sel_reg);
 882                 sel &= ~info->sel_bit;
 883                 sel |= info->save_sel & info->sel_bit;
 884                 writel(sel, info->sel_reg);
 885
 886                 if (allow_clk_stop(info))
 887                         clk_disable(info->clk);
 888         }
 889
 890         return 0;
 891 }
 892
 893 #else
 894 #define s3c24xx_nand_suspend NULL
 895 #define s3c24xx_nand_resume NULL
 896 #endif
 897
 898 /* driver device registration */
 899
 900 static int s3c2410_nand_probe(struct platform_device *dev)
 901 {
 902         return s3c24xx_nand_probe(dev, TYPE_S3C2410);
 903 }
 904
 905 static int s3c2440_nand_probe(struct platform_device *dev)
 906 {
 907         return s3c24xx_nand_probe(dev, TYPE_S3C2440);
 908 }
 909
 910 static int s3c2412_nand_probe(struct platform_device *dev)
 911 {
 912         return s3c24xx_nand_probe(dev, TYPE_S3C2412);
 913 }
 914
 915 static struct platform_driver s3c2410_nand_driver = {
 916         .probe          = s3c2410_nand_probe,
 917         .remove         = s3c2410_nand_remove,
 918         .suspend        = s3c24xx_nand_suspend,
 919         .resume         = s3c24xx_nand_resume,
 920         .driver         = {
 921                 .name   = "s3c2410-nand",
 922                 .owner  = THIS_MODULE,
 923         },
 924 };
 925
 926 static struct platform_driver s3c2440_nand_driver = {
 927         .probe          = s3c2440_nand_probe,
 928         .remove         = s3c2410_nand_remove,
 929         .suspend        = s3c24xx_nand_suspend,
 930         .resume         = s3c24xx_nand_resume,
 931         .driver         = {
 932                 .name   = "s3c2440-nand",
 933                 .owner  = THIS_MODULE,
 934         },
 935 };
 936
 937 static struct platform_driver s3c2412_nand_driver = {
 938         .probe          = s3c2412_nand_probe,
 939         .remove         = s3c2410_nand_remove,
 940         .suspend        = s3c24xx_nand_suspend,
 941         .resume         = s3c24xx_nand_resume,
 942         .driver         = {
 943                 .name   = "s3c2412-nand",
 944                 .owner  = THIS_MODULE,
 945         },
 946 };
 947
 948 static int __init s3c2410_nand_init(void)
 949 {
 950         printk("S3C24XX NAND Driver, (c) 2004 Simtec Electronics\n");
 951
 952         platform_driver_register(&s3c2412_nand_driver);
 953         platform_driver_register(&s3c2440_nand_driver);
 954         return platform_driver_register(&s3c2410_nand_driver);
 955 }
 956
 957 static void __exit s3c2410_nand_exit(void)
 958 {
 959         platform_driver_unregister(&s3c2412_nand_driver);
 960         platform_driver_unregister(&s3c2440_nand_driver);
 961         platform_driver_unregister(&s3c2410_nand_driver);
 962 }
 963
 964 module_init(s3c2410_nand_init);
 965 module_exit(s3c2410_nand_exit);
 966
 967 MODULE_LICENSE("GPL");
 968 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
 969 MODULE_DESCRIPTION("S3C24XX MTD NAND driver");
 970 MODULE_ALIAS("platform:s3c2410-nand");
 971 MODULE_ALIAS("platform:s3c2412-nand");
 972 MODULE_ALIAS("platform:s3c2440-nand");