git.oblomov.eu Git - linux-2.6/blob - drivers/mtd/nand/s3c2410.c

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