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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 /* s3c2410_nand_hwcontrol
 272  *
 273  * Issue command and address cycles to the chip
 274 */
 275
 276 static void s3c2410_nand_hwcontrol(struct mtd_info *mtd, int cmd,
 277                                    unsigned int ctrl)
 278 {
 279         struct s3c2410_nand_info *info = s3c2410_nand_mtd_toinfo(mtd);
 280
 281         if (cmd == NAND_CMD_NONE)
 282                 return;
 283
 284         if (ctrl & NAND_CLE)
 285                 writeb(cmd, info->regs + S3C2410_NFCMD);
 286         else
 287                 writeb(cmd, info->regs + S3C2410_NFADDR);
 288 }
 289
 290 /* command and control functions */
 291
 292 static void s3c2440_nand_hwcontrol(struct mtd_info *mtd, int cmd,
 293                                    unsigned int ctrl)
 294 {
 295         struct s3c2410_nand_info *info = s3c2410_nand_mtd_toinfo(mtd);
 296
 297         if (cmd == NAND_CMD_NONE)
 298                 return;
 299
 300         if (ctrl & NAND_CLE)
 301                 writeb(cmd, info->regs + S3C2440_NFCMD);
 302         else
 303                 writeb(cmd, info->regs + S3C2440_NFADDR);
 304 }
 305
 306 /* s3c2410_nand_devready()
 307  *
 308  * returns 0 if the nand is busy, 1 if it is ready
 309 */
 310
 311 static int s3c2410_nand_devready(struct mtd_info *mtd)
 312 {
 313         struct s3c2410_nand_info *info = s3c2410_nand_mtd_toinfo(mtd);
 314
 315         if (info->is_s3c2440)
 316                 return readb(info->regs + S3C2440_NFSTAT) & S3C2440_NFSTAT_READY;
 317         return readb(info->regs + S3C2410_NFSTAT) & S3C2410_NFSTAT_BUSY;
 318 }
 319
 320 /* ECC handling functions */
 321
 322 static int s3c2410_nand_correct_data(struct mtd_info *mtd, u_char *dat, u_char *read_ecc, u_char *calc_ecc)
 323 {
 324         pr_debug("s3c2410_nand_correct_data(%p,%p,%p,%p)\n", mtd, dat, read_ecc, calc_ecc);
 325
 326         pr_debug("eccs: read %02x,%02x,%02x vs calc %02x,%02x,%02x\n",
 327                  read_ecc[0], read_ecc[1], read_ecc[2], calc_ecc[0], calc_ecc[1], calc_ecc[2]);
 328
 329         if (read_ecc[0] == calc_ecc[0] && read_ecc[1] == calc_ecc[1] && read_ecc[2] == calc_ecc[2])
 330                 return 0;
 331
 332         /* we curently have no method for correcting the error */
 333
 334         return -1;
 335 }
 336
 337 /* ECC functions
 338  *
 339  * These allow the s3c2410 and s3c2440 to use the controller's ECC
 340  * generator block to ECC the data as it passes through]
 341 */
 342
 343 static void s3c2410_nand_enable_hwecc(struct mtd_info *mtd, int mode)
 344 {
 345         struct s3c2410_nand_info *info = s3c2410_nand_mtd_toinfo(mtd);
 346         unsigned long ctrl;
 347
 348         ctrl = readl(info->regs + S3C2410_NFCONF);
 349         ctrl |= S3C2410_NFCONF_INITECC;
 350         writel(ctrl, info->regs + S3C2410_NFCONF);
 351 }
 352
 353 static void s3c2440_nand_enable_hwecc(struct mtd_info *mtd, int mode)
 354 {
 355         struct s3c2410_nand_info *info = s3c2410_nand_mtd_toinfo(mtd);
 356         unsigned long ctrl;
 357
 358         ctrl = readl(info->regs + S3C2440_NFCONT);
 359         writel(ctrl | S3C2440_NFCONT_INITECC, info->regs + S3C2440_NFCONT);
 360 }
 361
 362 static int s3c2410_nand_calculate_ecc(struct mtd_info *mtd, const u_char *dat, u_char *ecc_code)
 363 {
 364         struct s3c2410_nand_info *info = s3c2410_nand_mtd_toinfo(mtd);
 365
 366         ecc_code[0] = readb(info->regs + S3C2410_NFECC + 0);
 367         ecc_code[1] = readb(info->regs + S3C2410_NFECC + 1);
 368         ecc_code[2] = readb(info->regs + S3C2410_NFECC + 2);
 369
 370         pr_debug("calculate_ecc: returning ecc %02x,%02x,%02x\n", ecc_code[0], ecc_code[1], ecc_code[2]);
 371
 372         return 0;
 373 }
 374
 375 static int s3c2440_nand_calculate_ecc(struct mtd_info *mtd, const u_char *dat, u_char *ecc_code)
 376 {
 377         struct s3c2410_nand_info *info = s3c2410_nand_mtd_toinfo(mtd);
 378         unsigned long ecc = readl(info->regs + S3C2440_NFMECC0);
 379
 380         ecc_code[0] = ecc;
 381         ecc_code[1] = ecc >> 8;
 382         ecc_code[2] = ecc >> 16;
 383
 384         pr_debug("calculate_ecc: returning ecc %02x,%02x,%02x\n", ecc_code[0], ecc_code[1], ecc_code[2]);
 385
 386         return 0;
 387 }
 388
 389 /* over-ride the standard functions for a little more speed. We can
 390  * use read/write block to move the data buffers to/from the controller
 391 */
 392
 393 static void s3c2410_nand_read_buf(struct mtd_info *mtd, u_char *buf, int len)
 394 {
 395         struct nand_chip *this = mtd->priv;
 396         readsb(this->IO_ADDR_R, buf, len);
 397 }
 398
 399 static void s3c2410_nand_write_buf(struct mtd_info *mtd, const u_char *buf, int len)
 400 {
 401         struct nand_chip *this = mtd->priv;
 402         writesb(this->IO_ADDR_W, buf, len);
 403 }
 404
 405 /* device management functions */
 406
 407 static int s3c2410_nand_remove(struct platform_device *pdev)
 408 {
 409         struct s3c2410_nand_info *info = to_nand_info(pdev);
 410
 411         platform_set_drvdata(pdev, NULL);
 412
 413         if (info == NULL)
 414                 return 0;
 415
 416         /* first thing we need to do is release all our mtds
 417          * and their partitions, then go through freeing the
 418          * resources used
 419          */
 420
 421         if (info->mtds != NULL) {
 422                 struct s3c2410_nand_mtd *ptr = info->mtds;
 423                 int mtdno;
 424
 425                 for (mtdno = 0; mtdno < info->mtd_count; mtdno++, ptr++) {
 426                         pr_debug("releasing mtd %d (%p)\n", mtdno, ptr);
 427                         nand_release(&ptr->mtd);
 428                 }
 429
 430                 kfree(info->mtds);
 431         }
 432
 433         /* free the common resources */
 434
 435         if (info->clk != NULL && !IS_ERR(info->clk)) {
 436                 if (!allow_clk_stop(info))
 437                         clk_disable(info->clk);
 438                 clk_put(info->clk);
 439         }
 440
 441         if (info->regs != NULL) {
 442                 iounmap(info->regs);
 443                 info->regs = NULL;
 444         }
 445
 446         if (info->area != NULL) {
 447                 release_resource(info->area);
 448                 kfree(info->area);
 449                 info->area = NULL;
 450         }
 451
 452         kfree(info);
 453
 454         return 0;
 455 }
 456
 457 #ifdef CONFIG_MTD_PARTITIONS
 458 static int s3c2410_nand_add_partition(struct s3c2410_nand_info *info,
 459                                       struct s3c2410_nand_mtd *mtd,
 460                                       struct s3c2410_nand_set *set)
 461 {
 462         if (set == NULL)
 463                 return add_mtd_device(&mtd->mtd);
 464
 465         if (set->nr_partitions > 0 && set->partitions != NULL) {
 466                 return add_mtd_partitions(&mtd->mtd, set->partitions, set->nr_partitions);
 467         }
 468
 469         return add_mtd_device(&mtd->mtd);
 470 }
 471 #else
 472 static int s3c2410_nand_add_partition(struct s3c2410_nand_info *info,
 473                                       struct s3c2410_nand_mtd *mtd,
 474                                       struct s3c2410_nand_set *set)
 475 {
 476         return add_mtd_device(&mtd->mtd);
 477 }
 478 #endif
 479
 480 /* s3c2410_nand_init_chip
 481  *
 482  * init a single instance of an chip
 483 */
 484
 485 static void s3c2410_nand_init_chip(struct s3c2410_nand_info *info,
 486                                    struct s3c2410_nand_mtd *nmtd,
 487                                    struct s3c2410_nand_set *set)
 488 {
 489         struct nand_chip *chip = &nmtd->chip;
 490
 491         chip->IO_ADDR_R    = info->regs + S3C2410_NFDATA;
 492         chip->IO_ADDR_W    = info->regs + S3C2410_NFDATA;
 493         chip->cmd_ctrl     = s3c2410_nand_hwcontrol;
 494         chip->dev_ready    = s3c2410_nand_devready;
 495         chip->write_buf    = s3c2410_nand_write_buf;
 496         chip->read_buf     = s3c2410_nand_read_buf;
 497         chip->select_chip  = s3c2410_nand_select_chip;
 498         chip->chip_delay   = 50;
 499         chip->priv         = nmtd;
 500         chip->options      = 0;
 501         chip->controller   = &info->controller;
 502
 503         if (info->is_s3c2440) {
 504                 chip->IO_ADDR_R  = info->regs + S3C2440_NFDATA;
 505                 chip->IO_ADDR_W  = info->regs + S3C2440_NFDATA;
 506                 chip->cmd_ctrl   = s3c2440_nand_hwcontrol;
 507         }
 508
 509         nmtd->info         = info;
 510         nmtd->mtd.priv     = chip;
 511         nmtd->mtd.owner    = THIS_MODULE;
 512         nmtd->set          = set;
 513
 514         if (hardware_ecc) {
 515                 chip->ecc.correct   = s3c2410_nand_correct_data;
 516                 chip->ecc.hwctl     = s3c2410_nand_enable_hwecc;
 517                 chip->ecc.calculate = s3c2410_nand_calculate_ecc;
 518                 chip->ecc.mode      = NAND_ECC_HW;
 519                 chip->ecc.size      = 512;
 520                 chip->ecc.bytes     = 3;
 521                 chip->ecc.layout    = &nand_hw_eccoob;
 522
 523                 if (info->is_s3c2440) {
 524                         chip->ecc.hwctl     = s3c2440_nand_enable_hwecc;
 525                         chip->ecc.calculate = s3c2440_nand_calculate_ecc;
 526                 }
 527         } else {
 528                 chip->ecc.mode      = NAND_ECC_SOFT;
 529         }
 530 }
 531
 532 /* s3c2410_nand_probe
 533  *
 534  * called by device layer when it finds a device matching
 535  * one our driver can handled. This code checks to see if
 536  * it can allocate all necessary resources then calls the
 537  * nand layer to look for devices
 538 */
 539
 540 static int s3c24xx_nand_probe(struct platform_device *pdev, int is_s3c2440)
 541 {
 542         struct s3c2410_platform_nand *plat = to_nand_plat(pdev);
 543         struct s3c2410_nand_info *info;
 544         struct s3c2410_nand_mtd *nmtd;
 545         struct s3c2410_nand_set *sets;
 546         struct resource *res;
 547         int err = 0;
 548         int size;
 549         int nr_sets;
 550         int setno;
 551
 552         pr_debug("s3c2410_nand_probe(%p)\n", pdev);
 553
 554         info = kmalloc(sizeof(*info), GFP_KERNEL);
 555         if (info == NULL) {
 556                 dev_err(&pdev->dev, "no memory for flash info\n");
 557                 err = -ENOMEM;
 558                 goto exit_error;
 559         }
 560
 561         memzero(info, sizeof(*info));
 562         platform_set_drvdata(pdev, info);
 563
 564         spin_lock_init(&info->controller.lock);
 565         init_waitqueue_head(&info->controller.wq);
 566
 567         /* get the clock source and enable it */
 568
 569         info->clk = clk_get(&pdev->dev, "nand");
 570         if (IS_ERR(info->clk)) {
 571                 dev_err(&pdev->dev, "failed to get clock");
 572                 err = -ENOENT;
 573                 goto exit_error;
 574         }
 575
 576         clk_enable(info->clk);
 577
 578         /* allocate and map the resource */
 579
 580         /* currently we assume we have the one resource */
 581         res  = pdev->resource;
 582         size = res->end - res->start + 1;
 583
 584         info->area = request_mem_region(res->start, size, pdev->name);
 585
 586         if (info->area == NULL) {
 587                 dev_err(&pdev->dev, "cannot reserve register region\n");
 588                 err = -ENOENT;
 589                 goto exit_error;
 590         }
 591
 592         info->device     = &pdev->dev;
 593         info->platform   = plat;
 594         info->regs       = ioremap(res->start, size);
 595         info->is_s3c2440 = is_s3c2440;
 596
 597         if (info->regs == NULL) {
 598                 dev_err(&pdev->dev, "cannot reserve register region\n");
 599                 err = -EIO;
 600                 goto exit_error;
 601         }
 602
 603         dev_dbg(&pdev->dev, "mapped registers at %p\n", info->regs);
 604
 605         /* initialise the hardware */
 606
 607         err = s3c2410_nand_inithw(info, pdev);
 608         if (err != 0)
 609                 goto exit_error;
 610
 611         sets = (plat != NULL) ? plat->sets : NULL;
 612         nr_sets = (plat != NULL) ? plat->nr_sets : 1;
 613
 614         info->mtd_count = nr_sets;
 615
 616         /* allocate our information */
 617
 618         size = nr_sets * sizeof(*info->mtds);
 619         info->mtds = kmalloc(size, GFP_KERNEL);
 620         if (info->mtds == NULL) {
 621                 dev_err(&pdev->dev, "failed to allocate mtd storage\n");
 622                 err = -ENOMEM;
 623                 goto exit_error;
 624         }
 625
 626         memzero(info->mtds, size);
 627
 628         /* initialise all possible chips */
 629
 630         nmtd = info->mtds;
 631
 632         for (setno = 0; setno < nr_sets; setno++, nmtd++) {
 633                 pr_debug("initialising set %d (%p, info %p)\n", setno, nmtd, info);
 634
 635                 s3c2410_nand_init_chip(info, nmtd, sets);
 636
 637                 nmtd->scan_res = nand_scan(&nmtd->mtd, (sets) ? sets->nr_chips : 1);
 638
 639                 if (nmtd->scan_res == 0) {
 640                         s3c2410_nand_add_partition(info, nmtd, sets);
 641                 }
 642
 643                 if (sets != NULL)
 644                         sets++;
 645         }
 646
 647         if (allow_clk_stop(info)) {
 648                 dev_info(&pdev->dev, "clock idle support enabled\n");
 649                 clk_disable(info->clk);
 650         }
 651
 652         pr_debug("initialised ok\n");
 653         return 0;
 654
 655  exit_error:
 656         s3c2410_nand_remove(pdev);
 657
 658         if (err == 0)
 659                 err = -EINVAL;
 660         return err;
 661 }
 662
 663 /* PM Support */
 664 #ifdef CONFIG_PM
 665
 666 static int s3c24xx_nand_suspend(struct platform_device *dev, pm_message_t pm)
 667 {
 668         struct s3c2410_nand_info *info = platform_get_drvdata(dev);
 669
 670         if (info) {
 671                 if (!allow_clk_stop(info))
 672                         clk_disable(info->clk);
 673         }
 674
 675         return 0;
 676 }
 677
 678 static int s3c24xx_nand_resume(struct platform_device *dev)
 679 {
 680         struct s3c2410_nand_info *info = platform_get_drvdata(dev);
 681
 682         if (info) {
 683                 clk_enable(info->clk);
 684                 s3c2410_nand_inithw(info, dev);
 685
 686                 if (allow_clk_stop(info))
 687                         clk_disable(info->clk);
 688         }
 689
 690         return 0;
 691 }
 692
 693 #else
 694 #define s3c24xx_nand_suspend NULL
 695 #define s3c24xx_nand_resume NULL
 696 #endif
 697
 698 /* driver device registration */
 699
 700 static int s3c2410_nand_probe(struct platform_device *dev)
 701 {
 702         return s3c24xx_nand_probe(dev, 0);
 703 }
 704
 705 static int s3c2440_nand_probe(struct platform_device *dev)
 706 {
 707         return s3c24xx_nand_probe(dev, 1);
 708 }
 709
 710 static struct platform_driver s3c2410_nand_driver = {
 711         .probe          = s3c2410_nand_probe,
 712         .remove         = s3c2410_nand_remove,
 713         .suspend        = s3c24xx_nand_suspend,
 714         .resume         = s3c24xx_nand_resume,
 715         .driver         = {
 716                 .name   = "s3c2410-nand",
 717                 .owner  = THIS_MODULE,
 718         },
 719 };
 720
 721 static struct platform_driver s3c2440_nand_driver = {
 722         .probe          = s3c2440_nand_probe,
 723         .remove         = s3c2410_nand_remove,
 724         .suspend        = s3c24xx_nand_suspend,
 725         .resume         = s3c24xx_nand_resume,
 726         .driver         = {
 727                 .name   = "s3c2440-nand",
 728                 .owner  = THIS_MODULE,
 729         },
 730 };
 731
 732 static int __init s3c2410_nand_init(void)
 733 {
 734         printk("S3C24XX NAND Driver, (c) 2004 Simtec Electronics\n");
 735
 736         platform_driver_register(&s3c2440_nand_driver);
 737         return platform_driver_register(&s3c2410_nand_driver);
 738 }
 739
 740 static void __exit s3c2410_nand_exit(void)
 741 {
 742         platform_driver_unregister(&s3c2440_nand_driver);
 743         platform_driver_unregister(&s3c2410_nand_driver);
 744 }
 745
 746 module_init(s3c2410_nand_init);
 747 module_exit(s3c2410_nand_exit);
 748
 749 MODULE_LICENSE("GPL");
 750 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
 751 MODULE_DESCRIPTION("S3C24XX MTD NAND driver");