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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  Mulitple 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/arch/regs-nand.h>
  64 #include <asm/arch/nand.h>
  65
  66 #define PFX "s3c2410-nand: "
  67
  68 #ifdef CONFIG_MTD_NAND_S3C2410_HWECC
  69 static int hardware_ecc = 1;
  70 #else
  71 static int hardware_ecc = 0;
  72 #endif
  73
  74 #ifdef CONFIG_MTD_NAND_S3C2410_CLKSTOP
  75 static int clock_stop = 1;
  76 #else
  77 static const int clock_stop = 0;
  78 #endif
  79
  80
  81 /* new oob placement block for use with hardware ecc generation
  82  */
  83
  84 static struct nand_ecclayout nand_hw_eccoob = {
  85         .eccbytes = 3,
  86         .eccpos = {0, 1, 2},
  87         .oobfree = {{8, 8}}
  88 };
  89
  90 /* controller and mtd information */
  91
  92 struct s3c2410_nand_info;
  93
  94 struct s3c2410_nand_mtd {
  95         struct mtd_info                 mtd;
  96         struct nand_chip                chip;
  97         struct s3c2410_nand_set         *set;
  98         struct s3c2410_nand_info        *info;
  99         int                             scan_res;
 100 };
 101
 102 /* overview of the s3c2410 nand state */
 103
 104 struct s3c2410_nand_info {
 105         /* mtd info */
 106         struct nand_hw_control          controller;
 107         struct s3c2410_nand_mtd         *mtds;
 108         struct s3c2410_platform_nand    *platform;
 109
 110         /* device info */
 111         struct device                   *device;
 112         struct resource                 *area;
 113         struct clk                      *clk;
 114         void __iomem                    *regs;
 115         int                             mtd_count;
 116
 117         unsigned char                   is_s3c2440;
 118 };
 119
 120 /* conversion functions */
 121
 122 static struct s3c2410_nand_mtd *s3c2410_nand_mtd_toours(struct mtd_info *mtd)
 123 {
 124         return container_of(mtd, struct s3c2410_nand_mtd, mtd);
 125 }
 126
 127 static struct s3c2410_nand_info *s3c2410_nand_mtd_toinfo(struct mtd_info *mtd)
 128 {
 129         return s3c2410_nand_mtd_toours(mtd)->info;
 130 }
 131
 132 static struct s3c2410_nand_info *to_nand_info(struct platform_device *dev)
 133 {
 134         return platform_get_drvdata(dev);
 135 }
 136
 137 static struct s3c2410_platform_nand *to_nand_plat(struct platform_device *dev)
 138 {
 139         return dev->dev.platform_data;
 140 }
 141
 142 static inline int allow_clk_stop(struct s3c2410_nand_info *info)
 143 {
 144         return clock_stop;
 145 }
 146
 147 /* timing calculations */
 148
 149 #define NS_IN_KHZ 1000000
 150
 151 static int s3c2410_nand_calc_rate(int wanted, unsigned long clk, int max)
 152 {
 153         int result;
 154
 155         result = (wanted * clk) / NS_IN_KHZ;
 156         result++;
 157
 158         pr_debug("result %d from %ld, %d\n", result, clk, wanted);
 159
 160         if (result > max) {
 161                 printk("%d ns is too big for current clock rate %ld\n", wanted, clk);
 162                 return -1;
 163         }
 164
 165         if (result < 1)
 166                 result = 1;
 167
 168         return result;
 169 }
 170
 171 #define to_ns(ticks,clk) (((ticks) * NS_IN_KHZ) / (unsigned int)(clk))
 172
 173 /* controller setup */
 174
 175 static int s3c2410_nand_inithw(struct s3c2410_nand_info *info, struct platform_device *pdev)
 176 {
 177         struct s3c2410_platform_nand *plat = to_nand_plat(pdev);
 178         unsigned long clkrate = clk_get_rate(info->clk);
 179         int tacls, twrph0, twrph1;
 180         unsigned long cfg;
 181
 182         /* calculate the timing information for the controller */
 183
 184         clkrate /= 1000;        /* turn clock into kHz for ease of use */
 185
 186         if (plat != NULL) {
 187                 tacls = s3c2410_nand_calc_rate(plat->tacls, clkrate, 4);
 188                 twrph0 = s3c2410_nand_calc_rate(plat->twrph0, clkrate, 8);
 189                 twrph1 = s3c2410_nand_calc_rate(plat->twrph1, clkrate, 8);
 190         } else {
 191                 /* default timings */
 192                 tacls = 4;
 193                 twrph0 = 8;
 194                 twrph1 = 8;
 195         }
 196
 197         if (tacls < 0 || twrph0 < 0 || twrph1 < 0) {
 198                 printk(KERN_ERR PFX "cannot get timings suitable for board\n");
 199                 return -EINVAL;
 200         }
 201
 202         printk(KERN_INFO PFX "Tacls=%d, %dns Twrph0=%d %dns, Twrph1=%d %dns\n",
 203                tacls, to_ns(tacls, clkrate), twrph0, to_ns(twrph0, clkrate), twrph1, to_ns(twrph1, clkrate));
 204
 205         if (!info->is_s3c2440) {
 206                 cfg = S3C2410_NFCONF_EN;
 207                 cfg |= S3C2410_NFCONF_TACLS(tacls - 1);
 208                 cfg |= S3C2410_NFCONF_TWRPH0(twrph0 - 1);
 209                 cfg |= S3C2410_NFCONF_TWRPH1(twrph1 - 1);
 210         } else {
 211                 cfg = S3C2440_NFCONF_TACLS(tacls - 1);
 212                 cfg |= S3C2440_NFCONF_TWRPH0(twrph0 - 1);
 213                 cfg |= S3C2440_NFCONF_TWRPH1(twrph1 - 1);
 214
 215                 /* enable the controller and de-assert nFCE */
 216
 217                 writel(S3C2440_NFCONT_ENABLE | S3C2440_NFCONT_ENABLE,
 218                        info->regs + S3C2440_NFCONT);
 219         }
 220
 221         pr_debug(PFX "NF_CONF is 0x%lx\n", cfg);
 222
 223         writel(cfg, info->regs + S3C2410_NFCONF);
 224         return 0;
 225 }
 226
 227 /* select chip */
 228
 229 static void s3c2410_nand_select_chip(struct mtd_info *mtd, int chip)
 230 {
 231         struct s3c2410_nand_info *info;
 232         struct s3c2410_nand_mtd *nmtd;
 233         struct nand_chip *this = mtd->priv;
 234         void __iomem *reg;
 235         unsigned long cur;
 236         unsigned long bit;
 237
 238         nmtd = this->priv;
 239         info = nmtd->info;
 240
 241         bit = (info->is_s3c2440) ? S3C2440_NFCONT_nFCE : S3C2410_NFCONF_nFCE;
 242         reg = info->regs + ((info->is_s3c2440) ? S3C2440_NFCONT : S3C2410_NFCONF);
 243
 244         if (chip != -1 && allow_clk_stop(info))
 245                 clk_enable(info->clk);
 246
 247         cur = readl(reg);
 248
 249         if (chip == -1) {
 250                 cur |= bit;
 251         } else {
 252                 if (nmtd->set != NULL && chip > nmtd->set->nr_chips) {
 253                         printk(KERN_ERR PFX "chip %d out of range\n", chip);
 254                         return;
 255                 }
 256
 257                 if (info->platform != NULL) {
 258                         if (info->platform->select_chip != NULL)
 259                                 (info->platform->select_chip) (nmtd->set, chip);
 260                 }
 261
 262                 cur &= ~bit;
 263         }
 264
 265         writel(cur, reg);
 266
 267         if (chip == -1 && allow_clk_stop(info))
 268                 clk_disable(info->clk);
 269 }
 270
 271 /* command and control functions
 272  *
 273  * Note, these all use tglx's method of changing the IO_ADDR_W field
 274  * to make the code simpler, and use the nand layer's code to issue the
 275  * command and address sequences via the proper IO ports.
 276  *
 277 */
 278
 279 static void s3c2410_nand_hwcontrol(struct mtd_info *mtd, int cmd,
 280                                    unsigned int ctrl)
 281 {
 282         struct s3c2410_nand_info *info = s3c2410_nand_mtd_toinfo(mtd);
 283         struct nand_chip *chip = mtd->priv;
 284
 285         if (cmd == NAND_CMD_NONE)
 286                 return;
 287
 288         if (ctrl & NAND_CLE)
 289                 writeb(cmd, info->regs + S3C2410_NFCMD);
 290         else
 291                 writeb(cmd, info->regs + S3C2410_NFADDR);
 292 }
 293
 294 /* command and control functions */
 295
 296 static void s3c2440_nand_hwcontrol(struct mtd_info *mtd, int cmd,
 297                                    unsigned int ctrl)
 298 {
 299         struct s3c2410_nand_info *info = s3c2410_nand_mtd_toinfo(mtd);
 300         struct nand_chip *chip = mtd->priv;
 301
 302         if (cmd == NAND_CMD_NONE)
 303                 return;
 304
 305         if (ctrl & NAND_CLE)
 306                 writeb(cmd, info->regs + S3C2440_NFCMD);
 307         else
 308                 writeb(cmd, info->regs + S3C2440_NFADDR);
 309 }
 310
 311 /* s3c2410_nand_devready()
 312  *
 313  * returns 0 if the nand is busy, 1 if it is ready
 314 */
 315
 316 static int s3c2410_nand_devready(struct mtd_info *mtd)
 317 {
 318         struct s3c2410_nand_info *info = s3c2410_nand_mtd_toinfo(mtd);
 319
 320         if (info->is_s3c2440)
 321                 return readb(info->regs + S3C2440_NFSTAT) & S3C2440_NFSTAT_READY;
 322         return readb(info->regs + S3C2410_NFSTAT) & S3C2410_NFSTAT_BUSY;
 323 }
 324
 325 /* ECC handling functions */
 326
 327 static int s3c2410_nand_correct_data(struct mtd_info *mtd, u_char *dat, u_char *read_ecc, u_char *calc_ecc)
 328 {
 329         pr_debug("s3c2410_nand_correct_data(%p,%p,%p,%p)\n", mtd, dat, read_ecc, calc_ecc);
 330
 331         pr_debug("eccs: read %02x,%02x,%02x vs calc %02x,%02x,%02x\n",
 332                  read_ecc[0], read_ecc[1], read_ecc[2], calc_ecc[0], calc_ecc[1], calc_ecc[2]);
 333
 334         if (read_ecc[0] == calc_ecc[0] && read_ecc[1] == calc_ecc[1] && read_ecc[2] == calc_ecc[2])
 335                 return 0;
 336
 337         /* we curently have no method for correcting the error */
 338
 339         return -1;
 340 }
 341
 342 /* ECC functions
 343  *
 344  * These allow the s3c2410 and s3c2440 to use the controller's ECC
 345  * generator block to ECC the data as it passes through]
 346 */
 347
 348 static void s3c2410_nand_enable_hwecc(struct mtd_info *mtd, int mode)
 349 {
 350         struct s3c2410_nand_info *info = s3c2410_nand_mtd_toinfo(mtd);
 351         unsigned long ctrl;
 352
 353         ctrl = readl(info->regs + S3C2410_NFCONF);
 354         ctrl |= S3C2410_NFCONF_INITECC;
 355         writel(ctrl, info->regs + S3C2410_NFCONF);
 356 }
 357
 358 static void s3c2440_nand_enable_hwecc(struct mtd_info *mtd, int mode)
 359 {
 360         struct s3c2410_nand_info *info = s3c2410_nand_mtd_toinfo(mtd);
 361         unsigned long ctrl;
 362
 363         ctrl = readl(info->regs + S3C2440_NFCONT);
 364         writel(ctrl | S3C2440_NFCONT_INITECC, info->regs + S3C2440_NFCONT);
 365 }
 366
 367 static int s3c2410_nand_calculate_ecc(struct mtd_info *mtd, const u_char *dat, u_char *ecc_code)
 368 {
 369         struct s3c2410_nand_info *info = s3c2410_nand_mtd_toinfo(mtd);
 370
 371         ecc_code[0] = readb(info->regs + S3C2410_NFECC + 0);
 372         ecc_code[1] = readb(info->regs + S3C2410_NFECC + 1);
 373         ecc_code[2] = readb(info->regs + S3C2410_NFECC + 2);
 374
 375         pr_debug("calculate_ecc: returning ecc %02x,%02x,%02x\n", ecc_code[0], ecc_code[1], ecc_code[2]);
 376
 377         return 0;
 378 }
 379
 380 static int s3c2440_nand_calculate_ecc(struct mtd_info *mtd, const u_char *dat, u_char *ecc_code)
 381 {
 382         struct s3c2410_nand_info *info = s3c2410_nand_mtd_toinfo(mtd);
 383         unsigned long ecc = readl(info->regs + S3C2440_NFMECC0);
 384
 385         ecc_code[0] = ecc;
 386         ecc_code[1] = ecc >> 8;
 387         ecc_code[2] = ecc >> 16;
 388
 389         pr_debug("calculate_ecc: returning ecc %02x,%02x,%02x\n", ecc_code[0], ecc_code[1], ecc_code[2]);
 390
 391         return 0;
 392 }
 393
 394 /* over-ride the standard functions for a little more speed. We can
 395  * use read/write block to move the data buffers to/from the controller
 396 */
 397
 398 static void s3c2410_nand_read_buf(struct mtd_info *mtd, u_char *buf, int len)
 399 {
 400         struct nand_chip *this = mtd->priv;
 401         readsb(this->IO_ADDR_R, buf, len);
 402 }
 403
 404 static void s3c2410_nand_write_buf(struct mtd_info *mtd, const u_char *buf, int len)
 405 {
 406         struct nand_chip *this = mtd->priv;
 407         writesb(this->IO_ADDR_W, buf, len);
 408 }
 409
 410 /* device management functions */
 411
 412 static int s3c2410_nand_remove(struct platform_device *pdev)
 413 {
 414         struct s3c2410_nand_info *info = to_nand_info(pdev);
 415
 416         platform_set_drvdata(pdev, NULL);
 417
 418         if (info == NULL)
 419                 return 0;
 420
 421         /* first thing we need to do is release all our mtds
 422          * and their partitions, then go through freeing the
 423          * resources used
 424          */
 425
 426         if (info->mtds != NULL) {
 427                 struct s3c2410_nand_mtd *ptr = info->mtds;
 428                 int mtdno;
 429
 430                 for (mtdno = 0; mtdno < info->mtd_count; mtdno++, ptr++) {
 431                         pr_debug("releasing mtd %d (%p)\n", mtdno, ptr);
 432                         nand_release(&ptr->mtd);
 433                 }
 434
 435                 kfree(info->mtds);
 436         }
 437
 438         /* free the common resources */
 439
 440         if (info->clk != NULL && !IS_ERR(info->clk)) {
 441                 if (!allow_clk_stop(info))
 442                         clk_disable(info->clk);
 443                 clk_put(info->clk);
 444         }
 445
 446         if (info->regs != NULL) {
 447                 iounmap(info->regs);
 448                 info->regs = NULL;
 449         }
 450
 451         if (info->area != NULL) {
 452                 release_resource(info->area);
 453                 kfree(info->area);
 454                 info->area = NULL;
 455         }
 456
 457         kfree(info);
 458
 459         return 0;
 460 }
 461
 462 #ifdef CONFIG_MTD_PARTITIONS
 463 static int s3c2410_nand_add_partition(struct s3c2410_nand_info *info,
 464                                       struct s3c2410_nand_mtd *mtd,
 465                                       struct s3c2410_nand_set *set)
 466 {
 467         if (set == NULL)
 468                 return add_mtd_device(&mtd->mtd);
 469
 470         if (set->nr_partitions > 0 && set->partitions != NULL) {
 471                 return add_mtd_partitions(&mtd->mtd, set->partitions, set->nr_partitions);
 472         }
 473
 474         return add_mtd_device(&mtd->mtd);
 475 }
 476 #else
 477 static int s3c2410_nand_add_partition(struct s3c2410_nand_info *info,
 478                                       struct s3c2410_nand_mtd *mtd,
 479                                       struct s3c2410_nand_set *set)
 480 {
 481         return add_mtd_device(&mtd->mtd);
 482 }
 483 #endif
 484
 485 /* s3c2410_nand_init_chip
 486  *
 487  * init a single instance of an chip
 488 */
 489
 490 static void s3c2410_nand_init_chip(struct s3c2410_nand_info *info,
 491                                    struct s3c2410_nand_mtd *nmtd,
 492                                    struct s3c2410_nand_set *set)
 493 {
 494         struct nand_chip *chip = &nmtd->chip;
 495
 496         chip->IO_ADDR_R    = info->regs + S3C2410_NFDATA;
 497         chip->IO_ADDR_W    = info->regs + S3C2410_NFDATA;
 498         chip->cmd_ctrl     = s3c2410_nand_hwcontrol;
 499         chip->dev_ready    = s3c2410_nand_devready;
 500         chip->write_buf    = s3c2410_nand_write_buf;
 501         chip->read_buf     = s3c2410_nand_read_buf;
 502         chip->select_chip  = s3c2410_nand_select_chip;
 503         chip->chip_delay   = 50;
 504         chip->priv         = nmtd;
 505         chip->options      = 0;
 506         chip->controller   = &info->controller;
 507
 508         if (info->is_s3c2440) {
 509                 chip->IO_ADDR_R  = info->regs + S3C2440_NFDATA;
 510                 chip->IO_ADDR_W  = info->regs + S3C2440_NFDATA;
 511                 chip->cmd_ctrl   = s3c2440_nand_hwcontrol;
 512         }
 513
 514         nmtd->info         = info;
 515         nmtd->mtd.priv     = chip;
 516         nmtd->mtd.owner    = THIS_MODULE;
 517         nmtd->set          = set;
 518
 519         if (hardware_ecc) {
 520                 chip->ecc.correct   = s3c2410_nand_correct_data;
 521                 chip->ecc.hwctl     = s3c2410_nand_enable_hwecc;
 522                 chip->ecc.calculate = s3c2410_nand_calculate_ecc;
 523                 chip->ecc.mode      = NAND_ECC_HW;
 524                 chip->ecc.size      = 512;
 525                 chip->ecc.bytes     = 3;
 526                 chip->ecc.layout    = &nand_hw_eccoob;
 527
 528                 if (info->is_s3c2440) {
 529                         chip->ecc.hwctl     = s3c2440_nand_enable_hwecc;
 530                         chip->ecc.calculate = s3c2440_nand_calculate_ecc;
 531                 }
 532         } else {
 533                 chip->ecc.mode      = NAND_ECC_SOFT;
 534         }
 535 }
 536
 537 /* s3c2410_nand_probe
 538  *
 539  * called by device layer when it finds a device matching
 540  * one our driver can handled. This code checks to see if
 541  * it can allocate all necessary resources then calls the
 542  * nand layer to look for devices
 543 */
 544
 545 static int s3c24xx_nand_probe(struct platform_device *pdev, int is_s3c2440)
 546 {
 547         struct s3c2410_platform_nand *plat = to_nand_plat(pdev);
 548         struct s3c2410_nand_info *info;
 549         struct s3c2410_nand_mtd *nmtd;
 550         struct s3c2410_nand_set *sets;
 551         struct resource *res;
 552         int err = 0;
 553         int size;
 554         int nr_sets;
 555         int setno;
 556
 557         pr_debug("s3c2410_nand_probe(%p)\n", pdev);
 558
 559         info = kmalloc(sizeof(*info), GFP_KERNEL);
 560         if (info == NULL) {
 561                 dev_err(&pdev->dev, "no memory for flash info\n");
 562                 err = -ENOMEM;
 563                 goto exit_error;
 564         }
 565
 566         memzero(info, sizeof(*info));
 567         platform_set_drvdata(pdev, info);
 568
 569         spin_lock_init(&info->controller.lock);
 570         init_waitqueue_head(&info->controller.wq);
 571
 572         /* get the clock source and enable it */
 573
 574         info->clk = clk_get(&pdev->dev, "nand");
 575         if (IS_ERR(info->clk)) {
 576                 dev_err(&pdev->dev, "failed to get clock");
 577                 err = -ENOENT;
 578                 goto exit_error;
 579         }
 580
 581         clk_enable(info->clk);
 582
 583         /* allocate and map the resource */
 584
 585         /* currently we assume we have the one resource */
 586         res  = pdev->resource;
 587         size = res->end - res->start + 1;
 588
 589         info->area = request_mem_region(res->start, size, pdev->name);
 590
 591         if (info->area == NULL) {
 592                 dev_err(&pdev->dev, "cannot reserve register region\n");
 593                 err = -ENOENT;
 594                 goto exit_error;
 595         }
 596
 597         info->device     = &pdev->dev;
 598         info->platform   = plat;
 599         info->regs       = ioremap(res->start, size);
 600         info->is_s3c2440 = is_s3c2440;
 601
 602         if (info->regs == NULL) {
 603                 dev_err(&pdev->dev, "cannot reserve register region\n");
 604                 err = -EIO;
 605                 goto exit_error;
 606         }
 607
 608         dev_dbg(&pdev->dev, "mapped registers at %p\n", info->regs);
 609
 610         /* initialise the hardware */
 611
 612         err = s3c2410_nand_inithw(info, pdev);
 613         if (err != 0)
 614                 goto exit_error;
 615
 616         sets = (plat != NULL) ? plat->sets : NULL;
 617         nr_sets = (plat != NULL) ? plat->nr_sets : 1;
 618
 619         info->mtd_count = nr_sets;
 620
 621         /* allocate our information */
 622
 623         size = nr_sets * sizeof(*info->mtds);
 624         info->mtds = kmalloc(size, GFP_KERNEL);
 625         if (info->mtds == NULL) {
 626                 dev_err(&pdev->dev, "failed to allocate mtd storage\n");
 627                 err = -ENOMEM;
 628                 goto exit_error;
 629         }
 630
 631         memzero(info->mtds, size);
 632
 633         /* initialise all possible chips */
 634
 635         nmtd = info->mtds;
 636
 637         for (setno = 0; setno < nr_sets; setno++, nmtd++) {
 638                 pr_debug("initialising set %d (%p, info %p)\n", setno, nmtd, info);
 639
 640                 s3c2410_nand_init_chip(info, nmtd, sets);
 641
 642                 nmtd->scan_res = nand_scan(&nmtd->mtd, (sets) ? sets->nr_chips : 1);
 643
 644                 if (nmtd->scan_res == 0) {
 645                         s3c2410_nand_add_partition(info, nmtd, sets);
 646                 }
 647
 648                 if (sets != NULL)
 649                         sets++;
 650         }
 651
 652         if (allow_clk_stop(info)) {
 653                 dev_info(&pdev->dev, "clock idle support enabled\n");
 654                 clk_disable(info->clk);
 655         }
 656
 657         pr_debug("initialised ok\n");
 658         return 0;
 659
 660  exit_error:
 661         s3c2410_nand_remove(pdev);
 662
 663         if (err == 0)
 664                 err = -EINVAL;
 665         return err;
 666 }
 667
 668 /* PM Support */
 669 #ifdef CONFIG_PM
 670
 671 static int s3c24xx_nand_suspend(struct platform_device *dev, pm_message_t pm)
 672 {
 673         struct s3c2410_nand_info *info = platform_get_drvdata(dev);
 674
 675         if (info) {
 676                 if (!allow_clk_stop(info))
 677                         clk_disable(info->clk);
 678         }
 679
 680         return 0;
 681 }
 682
 683 static int s3c24xx_nand_resume(struct platform_device *dev)
 684 {
 685         struct s3c2410_nand_info *info = platform_get_drvdata(dev);
 686
 687         if (info) {
 688                 clk_enable(info->clk);
 689                 s3c2410_nand_inithw(info, dev);
 690
 691                 if (allow_clk_stop(info))
 692                         clk_disable(info->clk);
 693         }
 694
 695         return 0;
 696 }
 697
 698 #else
 699 #define s3c24xx_nand_suspend NULL
 700 #define s3c24xx_nand_resume NULL
 701 #endif
 702
 703 /* driver device registration */
 704
 705 static int s3c2410_nand_probe(struct platform_device *dev)
 706 {
 707         return s3c24xx_nand_probe(dev, 0);
 708 }
 709
 710 static int s3c2440_nand_probe(struct platform_device *dev)
 711 {
 712         return s3c24xx_nand_probe(dev, 1);
 713 }
 714
 715 static struct platform_driver s3c2410_nand_driver = {
 716         .probe          = s3c2410_nand_probe,
 717         .remove         = s3c2410_nand_remove,
 718         .suspend        = s3c24xx_nand_suspend,
 719         .resume         = s3c24xx_nand_resume,
 720         .driver         = {
 721                 .name   = "s3c2410-nand",
 722                 .owner  = THIS_MODULE,
 723         },
 724 };
 725
 726 static struct platform_driver s3c2440_nand_driver = {
 727         .probe          = s3c2440_nand_probe,
 728         .remove         = s3c2410_nand_remove,
 729         .suspend        = s3c24xx_nand_suspend,
 730         .resume         = s3c24xx_nand_resume,
 731         .driver         = {
 732                 .name   = "s3c2440-nand",
 733                 .owner  = THIS_MODULE,
 734         },
 735 };
 736
 737 static int __init s3c2410_nand_init(void)
 738 {
 739         printk("S3C24XX NAND Driver, (c) 2004 Simtec Electronics\n");
 740
 741         platform_driver_register(&s3c2440_nand_driver);
 742         return platform_driver_register(&s3c2410_nand_driver);
 743 }
 744
 745 static void __exit s3c2410_nand_exit(void)
 746 {
 747         platform_driver_unregister(&s3c2440_nand_driver);
 748         platform_driver_unregister(&s3c2410_nand_driver);
 749 }
 750
 751 module_init(s3c2410_nand_init);
 752 module_exit(s3c2410_nand_exit);
 753
 754 MODULE_LICENSE("GPL");
 755 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
 756 MODULE_DESCRIPTION("S3C24XX MTD NAND driver");