drivers/mmc/host/s3cmci.c

   1 /*
   2  *  linux/drivers/mmc/s3cmci.h - Samsung S3C MCI driver
   3  *
   4  *  Copyright (C) 2004-2006 maintech GmbH, Thomas Kleffel <tk@maintech.de>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <linux/module.h>
  12 #include <linux/dma-mapping.h>
  13 #include <linux/clk.h>
  14 #include <linux/mmc/host.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/irq.h>
  17 #include <linux/io.h>
  18
  19 #include <asm/dma.h>
  20
  21 #include <asm/arch/regs-sdi.h>
  22 #include <asm/arch/regs-gpio.h>
  23
  24 #include <asm/plat-s3c24xx/mci.h>
  25
  26 #include "s3cmci.h"
  27
  28 #define DRIVER_NAME "s3c-mci"
  29
  30 enum dbg_channels {
  31         dbg_err   = (1 << 0),
  32         dbg_debug = (1 << 1),
  33         dbg_info  = (1 << 2),
  34         dbg_irq   = (1 << 3),
  35         dbg_sg    = (1 << 4),
  36         dbg_dma   = (1 << 5),
  37         dbg_pio   = (1 << 6),
  38         dbg_fail  = (1 << 7),
  39         dbg_conf  = (1 << 8),
  40 };
  41
  42 static const int dbgmap_err   = dbg_err | dbg_fail;
  43 static const int dbgmap_info  = dbg_info | dbg_conf;
  44 static const int dbgmap_debug = dbg_debug;
  45
  46 #define dbg(host, channels, args...)              \
  47         do {                                      \
  48         if (dbgmap_err & channels)                \
  49                 dev_err(&host->pdev->dev, args);  \
  50         else if (dbgmap_info & channels)          \
  51                 dev_info(&host->pdev->dev, args); \
  52         else if (dbgmap_debug & channels)         \
  53                 dev_dbg(&host->pdev->dev, args);  \
  54         } while (0)
  55
  56 #define RESSIZE(ressource) (((ressource)->end - (ressource)->start)+1)
  57
  58 static struct s3c2410_dma_client s3cmci_dma_client = {
  59         .name           = "s3c-mci",
  60 };
  61
  62 static void finalize_request(struct s3cmci_host *host);
  63 static void s3cmci_send_request(struct mmc_host *mmc);
  64 static void s3cmci_reset(struct s3cmci_host *host);
  65
  66 #ifdef CONFIG_MMC_DEBUG
  67
  68 static void dbg_dumpregs(struct s3cmci_host *host, char *prefix)
  69 {
  70         u32 con, pre, cmdarg, cmdcon, cmdsta, r0, r1, r2, r3, timer, bsize;
  71         u32 datcon, datcnt, datsta, fsta, imask;
  72
  73         con     = readl(host->base + S3C2410_SDICON);
  74         pre     = readl(host->base + S3C2410_SDIPRE);
  75         cmdarg  = readl(host->base + S3C2410_SDICMDARG);
  76         cmdcon  = readl(host->base + S3C2410_SDICMDCON);
  77         cmdsta  = readl(host->base + S3C2410_SDICMDSTAT);
  78         r0      = readl(host->base + S3C2410_SDIRSP0);
  79         r1      = readl(host->base + S3C2410_SDIRSP1);
  80         r2      = readl(host->base + S3C2410_SDIRSP2);
  81         r3      = readl(host->base + S3C2410_SDIRSP3);
  82         timer   = readl(host->base + S3C2410_SDITIMER);
  83         bsize   = readl(host->base + S3C2410_SDIBSIZE);
  84         datcon  = readl(host->base + S3C2410_SDIDCON);
  85         datcnt  = readl(host->base + S3C2410_SDIDCNT);
  86         datsta  = readl(host->base + S3C2410_SDIDSTA);
  87         fsta    = readl(host->base + S3C2410_SDIFSTA);
  88         imask   = readl(host->base + host->sdiimsk);
  89
  90         dbg(host, dbg_debug, "%s  CON:[%08x]  PRE:[%08x]  TMR:[%08x]\n",
  91                                 prefix, con, pre, timer);
  92
  93         dbg(host, dbg_debug, "%s CCON:[%08x] CARG:[%08x] CSTA:[%08x]\n",
  94                                 prefix, cmdcon, cmdarg, cmdsta);
  95
  96         dbg(host, dbg_debug, "%s DCON:[%08x] FSTA:[%08x]"
  97                                " DSTA:[%08x] DCNT:[%08x]\n",
  98                                 prefix, datcon, fsta, datsta, datcnt);
  99
 100         dbg(host, dbg_debug, "%s   R0:[%08x]   R1:[%08x]"
 101                                "   R2:[%08x]   R3:[%08x]\n",
 102                                 prefix, r0, r1, r2, r3);
 103 }
 104
 105 static void prepare_dbgmsg(struct s3cmci_host *host, struct mmc_command *cmd,
 106                            int stop)
 107 {
 108         snprintf(host->dbgmsg_cmd, 300,
 109                  "#%u%s op:%i arg:0x%08x flags:0x08%x retries:%u",
 110                  host->ccnt, (stop ? " (STOP)" : ""),
 111                  cmd->opcode, cmd->arg, cmd->flags, cmd->retries);
 112
 113         if (cmd->data) {
 114                 snprintf(host->dbgmsg_dat, 300,
 115                          "#%u bsize:%u blocks:%u bytes:%u",
 116                          host->dcnt, cmd->data->blksz,
 117                          cmd->data->blocks,
 118                          cmd->data->blocks * cmd->data->blksz);
 119         } else {
 120                 host->dbgmsg_dat[0] = '\0';
 121         }
 122 }
 123
 124 static void dbg_dumpcmd(struct s3cmci_host *host, struct mmc_command *cmd,
 125                         int fail)
 126 {
 127         unsigned int dbglvl = fail ? dbg_fail : dbg_debug;
 128
 129         if (!cmd)
 130                 return;
 131
 132         if (cmd->error == 0) {
 133                 dbg(host, dbglvl, "CMD[OK] %s R0:0x%08x\n",
 134                         host->dbgmsg_cmd, cmd->resp[0]);
 135         } else {
 136                 dbg(host, dbglvl, "CMD[ERR %i] %s Status:%s\n",
 137                         cmd->error, host->dbgmsg_cmd, host->status);
 138         }
 139
 140         if (!cmd->data)
 141                 return;
 142
 143         if (cmd->data->error == 0) {
 144                 dbg(host, dbglvl, "DAT[OK] %s\n", host->dbgmsg_dat);
 145         } else {
 146                 dbg(host, dbglvl, "DAT[ERR %i] %s DCNT:0x%08x\n",
 147                         cmd->data->error, host->dbgmsg_dat,
 148                         readl(host->base + S3C2410_SDIDCNT));
 149         }
 150 }
 151 #else
 152 static void dbg_dumpcmd(struct s3cmci_host *host,
 153                         struct mmc_command *cmd, int fail) { }
 154
 155 static void prepare_dbgmsg(struct s3cmci_host *host, struct mmc_command *cmd,
 156                            int stop) { }
 157
 158 static void dbg_dumpregs(struct s3cmci_host *host, char *prefix) { }
 159
 160 #endif /* CONFIG_MMC_DEBUG */
 161
 162 static inline u32 enable_imask(struct s3cmci_host *host, u32 imask)
 163 {
 164         u32 newmask;
 165
 166         newmask = readl(host->base + host->sdiimsk);
 167         newmask |= imask;
 168
 169         writel(newmask, host->base + host->sdiimsk);
 170
 171         return newmask;
 172 }
 173
 174 static inline u32 disable_imask(struct s3cmci_host *host, u32 imask)
 175 {
 176         u32 newmask;
 177
 178         newmask = readl(host->base + host->sdiimsk);
 179         newmask &= ~imask;
 180
 181         writel(newmask, host->base + host->sdiimsk);
 182
 183         return newmask;
 184 }
 185
 186 static inline void clear_imask(struct s3cmci_host *host)
 187 {
 188         writel(0, host->base + host->sdiimsk);
 189 }
 190
 191 static inline int get_data_buffer(struct s3cmci_host *host,
 192                                   u32 *words, u32 **pointer)
 193 {
 194         struct scatterlist *sg;
 195
 196         if (host->pio_active == XFER_NONE)
 197                 return -EINVAL;
 198
 199         if ((!host->mrq) || (!host->mrq->data))
 200                 return -EINVAL;
 201
 202         if (host->pio_sgptr >= host->mrq->data->sg_len) {
 203                 dbg(host, dbg_debug, "no more buffers (%i/%i)\n",
 204                       host->pio_sgptr, host->mrq->data->sg_len);
 205                 return -EBUSY;
 206         }
 207         sg = &host->mrq->data->sg[host->pio_sgptr];
 208
 209         *words = sg->length >> 2;
 210         *pointer = sg_virt(sg);
 211
 212         host->pio_sgptr++;
 213
 214         dbg(host, dbg_sg, "new buffer (%i/%i)\n",
 215             host->pio_sgptr, host->mrq->data->sg_len);
 216
 217         return 0;
 218 }
 219
 220 static inline u32 fifo_count(struct s3cmci_host *host)
 221 {
 222         u32 fifostat = readl(host->base + S3C2410_SDIFSTA);
 223
 224         fifostat &= S3C2410_SDIFSTA_COUNTMASK;
 225         return fifostat >> 2;
 226 }
 227
 228 static inline u32 fifo_free(struct s3cmci_host *host)
 229 {
 230         u32 fifostat = readl(host->base + S3C2410_SDIFSTA);
 231
 232         fifostat &= S3C2410_SDIFSTA_COUNTMASK;
 233         return (63 - fifostat) >> 2;
 234 }
 235
 236 static void do_pio_read(struct s3cmci_host *host)
 237 {
 238         int res;
 239         u32 fifo;
 240         void __iomem *from_ptr;
 241
 242         /* write real prescaler to host, it might be set slow to fix */
 243         writel(host->prescaler, host->base + S3C2410_SDIPRE);
 244
 245         from_ptr = host->base + host->sdidata;
 246
 247         while ((fifo = fifo_count(host))) {
 248                 if (!host->pio_words) {
 249                         res = get_data_buffer(host, &host->pio_words,
 250                                               &host->pio_ptr);
 251                         if (res) {
 252                                 host->pio_active = XFER_NONE;
 253                                 host->complete_what = COMPLETION_FINALIZE;
 254
 255                                 dbg(host, dbg_pio, "pio_read(): "
 256                                     "complete (no more data).\n");
 257                                 return;
 258                         }
 259
 260                         dbg(host, dbg_pio,
 261                             "pio_read(): new target: [%i]@[%p]\n",
 262                             host->pio_words, host->pio_ptr);
 263                 }
 264
 265                 dbg(host, dbg_pio,
 266                     "pio_read(): fifo:[%02i] buffer:[%03i] dcnt:[%08X]\n",
 267                     fifo, host->pio_words,
 268                     readl(host->base + S3C2410_SDIDCNT));
 269
 270                 if (fifo > host->pio_words)
 271                         fifo = host->pio_words;
 272
 273                 host->pio_words -= fifo;
 274                 host->pio_count += fifo;
 275
 276                 while (fifo--)
 277                         *(host->pio_ptr++) = readl(from_ptr);
 278         }
 279
 280         if (!host->pio_words) {
 281                 res = get_data_buffer(host, &host->pio_words, &host->pio_ptr);
 282                 if (res) {
 283                         dbg(host, dbg_pio,
 284                             "pio_read(): complete (no more buffers).\n");
 285                         host->pio_active = XFER_NONE;
 286                         host->complete_what = COMPLETION_FINALIZE;
 287
 288                         return;
 289                 }
 290         }
 291
 292         enable_imask(host,
 293                      S3C2410_SDIIMSK_RXFIFOHALF | S3C2410_SDIIMSK_RXFIFOLAST);
 294 }
 295
 296 static void do_pio_write(struct s3cmci_host *host)
 297 {
 298         void __iomem *to_ptr;
 299         int res;
 300         u32 fifo;
 301
 302         to_ptr = host->base + host->sdidata;
 303
 304         while ((fifo = fifo_free(host))) {
 305                 if (!host->pio_words) {
 306                         res = get_data_buffer(host, &host->pio_words,
 307                                                         &host->pio_ptr);
 308                         if (res) {
 309                                 dbg(host, dbg_pio,
 310                                     "pio_write(): complete (no more data).\n");
 311                                 host->pio_active = XFER_NONE;
 312
 313                                 return;
 314                         }
 315
 316                         dbg(host, dbg_pio,
 317                             "pio_write(): new source: [%i]@[%p]\n",
 318                             host->pio_words, host->pio_ptr);
 319
 320                 }
 321
 322                 if (fifo > host->pio_words)
 323                         fifo = host->pio_words;
 324
 325                 host->pio_words -= fifo;
 326                 host->pio_count += fifo;
 327
 328                 while (fifo--)
 329                         writel(*(host->pio_ptr++), to_ptr);
 330         }
 331
 332         enable_imask(host, S3C2410_SDIIMSK_TXFIFOHALF);
 333 }
 334
 335 static void pio_tasklet(unsigned long data)
 336 {
 337         struct s3cmci_host *host = (struct s3cmci_host *) data;
 338
 339
 340         disable_irq(host->irq);
 341
 342         if (host->pio_active == XFER_WRITE)
 343                 do_pio_write(host);
 344
 345         if (host->pio_active == XFER_READ)
 346                 do_pio_read(host);
 347
 348         if (host->complete_what == COMPLETION_FINALIZE) {
 349                 clear_imask(host);
 350                 if (host->pio_active != XFER_NONE) {
 351                         dbg(host, dbg_err, "unfinished %s "
 352                             "- pio_count:[%u] pio_words:[%u]\n",
 353                             (host->pio_active == XFER_READ) ? "read" : "write",
 354                             host->pio_count, host->pio_words);
 355
 356                         host->mrq->data->error = -EINVAL;
 357                 }
 358
 359                 finalize_request(host);
 360         } else
 361                 enable_irq(host->irq);
 362 }
 363
 364 /*
 365  * ISR for SDI Interface IRQ
 366  * Communication between driver and ISR works as follows:
 367  *   host->mrq                  points to current request
 368  *   host->complete_what        Indicates when the request is considered done
 369  *     COMPLETION_CMDSENT         when the command was sent
 370  *     COMPLETION_RSPFIN          when a response was received
 371  *     COMPLETION_XFERFINISH      when the data transfer is finished
 372  *     COMPLETION_XFERFINISH_RSPFIN both of the above.
 373  *   host->complete_request     is the completion-object the driver waits for
 374  *
 375  * 1) Driver sets up host->mrq and host->complete_what
 376  * 2) Driver prepares the transfer
 377  * 3) Driver enables interrupts
 378  * 4) Driver starts transfer
 379  * 5) Driver waits for host->complete_rquest
 380  * 6) ISR checks for request status (errors and success)
 381  * 6) ISR sets host->mrq->cmd->error and host->mrq->data->error
 382  * 7) ISR completes host->complete_request
 383  * 8) ISR disables interrupts
 384  * 9) Driver wakes up and takes care of the request
 385  *
 386  * Note: "->error"-fields are expected to be set to 0 before the request
 387  *       was issued by mmc.c - therefore they are only set, when an error
 388  *       contition comes up
 389  */
 390
 391 static irqreturn_t s3cmci_irq(int irq, void *dev_id)
 392 {
 393         struct s3cmci_host *host = dev_id;
 394         struct mmc_command *cmd;
 395         u32 mci_csta, mci_dsta, mci_fsta, mci_dcnt, mci_imsk;
 396         u32 mci_cclear, mci_dclear;
 397         unsigned long iflags;
 398
 399         spin_lock_irqsave(&host->complete_lock, iflags);
 400
 401         mci_csta = readl(host->base + S3C2410_SDICMDSTAT);
 402         mci_dsta = readl(host->base + S3C2410_SDIDSTA);
 403         mci_dcnt = readl(host->base + S3C2410_SDIDCNT);
 404         mci_fsta = readl(host->base + S3C2410_SDIFSTA);
 405         mci_imsk = readl(host->base + host->sdiimsk);
 406         mci_cclear = 0;
 407         mci_dclear = 0;
 408
 409         if ((host->complete_what == COMPLETION_NONE) ||
 410             (host->complete_what == COMPLETION_FINALIZE)) {
 411                 host->status = "nothing to complete";
 412                 clear_imask(host);
 413                 goto irq_out;
 414         }
 415
 416         if (!host->mrq) {
 417                 host->status = "no active mrq";
 418                 clear_imask(host);
 419                 goto irq_out;
 420         }
 421
 422         cmd = host->cmd_is_stop ? host->mrq->stop : host->mrq->cmd;
 423
 424         if (!cmd) {
 425                 host->status = "no active cmd";
 426                 clear_imask(host);
 427                 goto irq_out;
 428         }
 429
 430         if (!host->dodma) {
 431                 if ((host->pio_active == XFER_WRITE) &&
 432                     (mci_fsta & S3C2410_SDIFSTA_TFDET)) {
 433
 434                         disable_imask(host, S3C2410_SDIIMSK_TXFIFOHALF);
 435                         tasklet_schedule(&host->pio_tasklet);
 436                         host->status = "pio tx";
 437                 }
 438
 439                 if ((host->pio_active == XFER_READ) &&
 440                     (mci_fsta & S3C2410_SDIFSTA_RFDET)) {
 441
 442                         disable_imask(host,
 443                                       S3C2410_SDIIMSK_RXFIFOHALF |
 444                                       S3C2410_SDIIMSK_RXFIFOLAST);
 445
 446                         tasklet_schedule(&host->pio_tasklet);
 447                         host->status = "pio rx";
 448                 }
 449         }
 450
 451         if (mci_csta & S3C2410_SDICMDSTAT_CMDTIMEOUT) {
 452                 cmd->error = -ETIMEDOUT;
 453                 host->status = "error: command timeout";
 454                 goto fail_transfer;
 455         }
 456
 457         if (mci_csta & S3C2410_SDICMDSTAT_CMDSENT) {
 458                 if (host->complete_what == COMPLETION_CMDSENT) {
 459                         host->status = "ok: command sent";
 460                         goto close_transfer;
 461                 }
 462
 463                 mci_cclear |= S3C2410_SDICMDSTAT_CMDSENT;
 464         }
 465
 466         if (mci_csta & S3C2410_SDICMDSTAT_CRCFAIL) {
 467                 if (cmd->flags & MMC_RSP_CRC) {
 468                         if (host->mrq->cmd->flags & MMC_RSP_136) {
 469                                 dbg(host, dbg_irq,
 470                                     "fixup: ignore CRC fail with long rsp\n");
 471                         } else {
 472                                 /* note, we used to fail the transfer
 473                                  * here, but it seems that this is just
 474                                  * the hardware getting it wrong.
 475                                  *
 476                                  * cmd->error = -EILSEQ;
 477                                  * host->status = "error: bad command crc";
 478                                  * goto fail_transfer;
 479                                 */
 480                         }
 481                 }
 482
 483                 mci_cclear |= S3C2410_SDICMDSTAT_CRCFAIL;
 484         }
 485
 486         if (mci_csta & S3C2410_SDICMDSTAT_RSPFIN) {
 487                 if (host->complete_what == COMPLETION_RSPFIN) {
 488                         host->status = "ok: command response received";
 489                         goto close_transfer;
 490                 }
 491
 492                 if (host->complete_what == COMPLETION_XFERFINISH_RSPFIN)
 493                         host->complete_what = COMPLETION_XFERFINISH;
 494
 495                 mci_cclear |= S3C2410_SDICMDSTAT_RSPFIN;
 496         }
 497
 498         /* errors handled after this point are only relevant
 499            when a data transfer is in progress */
 500
 501         if (!cmd->data)
 502                 goto clear_status_bits;
 503
 504         /* Check for FIFO failure */
 505         if (host->is2440) {
 506                 if (mci_fsta & S3C2440_SDIFSTA_FIFOFAIL) {
 507                         host->mrq->data->error = -EILSEQ;
 508                         host->status = "error: 2440 fifo failure";
 509                         goto fail_transfer;
 510                 }
 511         } else {
 512                 if (mci_dsta & S3C2410_SDIDSTA_FIFOFAIL) {
 513                         cmd->data->error = -EILSEQ;
 514                         host->status = "error:  fifo failure";
 515                         goto fail_transfer;
 516                 }
 517         }
 518
 519         if (mci_dsta & S3C2410_SDIDSTA_RXCRCFAIL) {
 520                 cmd->data->error = -EILSEQ;
 521                 host->status = "error: bad data crc (outgoing)";
 522                 goto fail_transfer;
 523         }
 524
 525         if (mci_dsta & S3C2410_SDIDSTA_CRCFAIL) {
 526                 cmd->data->error = -EILSEQ;
 527                 host->status = "error: bad data crc (incoming)";
 528                 goto fail_transfer;
 529         }
 530
 531         if (mci_dsta & S3C2410_SDIDSTA_DATATIMEOUT) {
 532                 cmd->data->error = -ETIMEDOUT;
 533                 host->status = "error: data timeout";
 534                 goto fail_transfer;
 535         }
 536
 537         if (mci_dsta & S3C2410_SDIDSTA_XFERFINISH) {
 538                 if (host->complete_what == COMPLETION_XFERFINISH) {
 539                         host->status = "ok: data transfer completed";
 540                         goto close_transfer;
 541                 }
 542
 543                 if (host->complete_what == COMPLETION_XFERFINISH_RSPFIN)
 544                         host->complete_what = COMPLETION_RSPFIN;
 545
 546                 mci_dclear |= S3C2410_SDIDSTA_XFERFINISH;
 547         }
 548
 549 clear_status_bits:
 550         writel(mci_cclear, host->base + S3C2410_SDICMDSTAT);
 551         writel(mci_dclear, host->base + S3C2410_SDIDSTA);
 552
 553         goto irq_out;
 554
 555 fail_transfer:
 556         host->pio_active = XFER_NONE;
 557
 558 close_transfer:
 559         host->complete_what = COMPLETION_FINALIZE;
 560
 561         clear_imask(host);
 562         tasklet_schedule(&host->pio_tasklet);
 563
 564         goto irq_out;
 565
 566 irq_out:
 567         dbg(host, dbg_irq,
 568             "csta:0x%08x dsta:0x%08x fsta:0x%08x dcnt:0x%08x status:%s.\n",
 569             mci_csta, mci_dsta, mci_fsta, mci_dcnt, host->status);
 570
 571         spin_unlock_irqrestore(&host->complete_lock, iflags);
 572         return IRQ_HANDLED;
 573
 574 }
 575
 576 /*
 577  * ISR for the CardDetect Pin
 578 */
 579
 580 static irqreturn_t s3cmci_irq_cd(int irq, void *dev_id)
 581 {
 582         struct s3cmci_host *host = (struct s3cmci_host *)dev_id;
 583
 584         dbg(host, dbg_irq, "card detect\n");
 585
 586         mmc_detect_change(host->mmc, 500);
 587
 588         return IRQ_HANDLED;
 589 }
 590
 591 void s3cmci_dma_done_callback(struct s3c2410_dma_chan *dma_ch, void *buf_id,
 592                               int size, enum s3c2410_dma_buffresult result)
 593 {
 594         struct s3cmci_host *host = buf_id;
 595         unsigned long iflags;
 596         u32 mci_csta, mci_dsta, mci_fsta, mci_dcnt;
 597
 598         mci_csta = readl(host->base + S3C2410_SDICMDSTAT);
 599         mci_dsta = readl(host->base + S3C2410_SDIDSTA);
 600         mci_fsta = readl(host->base + S3C2410_SDIFSTA);
 601         mci_dcnt = readl(host->base + S3C2410_SDIDCNT);
 602
 603         BUG_ON(!host->mrq);
 604         BUG_ON(!host->mrq->data);
 605         BUG_ON(!host->dmatogo);
 606
 607         spin_lock_irqsave(&host->complete_lock, iflags);
 608
 609         if (result != S3C2410_RES_OK) {
 610                 dbg(host, dbg_fail, "DMA FAILED: csta=0x%08x dsta=0x%08x "
 611                         "fsta=0x%08x dcnt:0x%08x result:0x%08x toGo:%u\n",
 612                         mci_csta, mci_dsta, mci_fsta,
 613                         mci_dcnt, result, host->dmatogo);
 614
 615                 goto fail_request;
 616         }
 617
 618         host->dmatogo--;
 619         if (host->dmatogo) {
 620                 dbg(host, dbg_dma, "DMA DONE  Size:%i DSTA:[%08x] "
 621                         "DCNT:[%08x] toGo:%u\n",
 622                         size, mci_dsta, mci_dcnt, host->dmatogo);
 623
 624                 goto out;
 625         }
 626
 627         dbg(host, dbg_dma, "DMA FINISHED Size:%i DSTA:%08x DCNT:%08x\n",
 628                 size, mci_dsta, mci_dcnt);
 629
 630         host->complete_what = COMPLETION_FINALIZE;
 631
 632 out:
 633         tasklet_schedule(&host->pio_tasklet);
 634         spin_unlock_irqrestore(&host->complete_lock, iflags);
 635         return;
 636
 637 fail_request:
 638         host->mrq->data->error = -EINVAL;
 639         host->complete_what = COMPLETION_FINALIZE;
 640         writel(0, host->base + host->sdiimsk);
 641         goto out;
 642
 643 }
 644
 645 static void finalize_request(struct s3cmci_host *host)
 646 {
 647         struct mmc_request *mrq = host->mrq;
 648         struct mmc_command *cmd = host->cmd_is_stop ? mrq->stop : mrq->cmd;
 649         int debug_as_failure = 0;
 650
 651         if (host->complete_what != COMPLETION_FINALIZE)
 652                 return;
 653
 654         if (!mrq)
 655                 return;
 656
 657         if (cmd->data && (cmd->error == 0) &&
 658             (cmd->data->error == 0)) {
 659                 if (host->dodma && (!host->dma_complete)) {
 660                         dbg(host, dbg_dma, "DMA Missing!\n");
 661                         return;
 662                 }
 663         }
 664
 665         /* Read response from controller. */
 666         cmd->resp[0] = readl(host->base + S3C2410_SDIRSP0);
 667         cmd->resp[1] = readl(host->base + S3C2410_SDIRSP1);
 668         cmd->resp[2] = readl(host->base + S3C2410_SDIRSP2);
 669         cmd->resp[3] = readl(host->base + S3C2410_SDIRSP3);
 670
 671         writel(host->prescaler, host->base + S3C2410_SDIPRE);
 672
 673         if (cmd->error)
 674                 debug_as_failure = 1;
 675
 676         if (cmd->data && cmd->data->error)
 677                 debug_as_failure = 1;
 678
 679         dbg_dumpcmd(host, cmd, debug_as_failure);
 680
 681         /* Cleanup controller */
 682         writel(0, host->base + S3C2410_SDICMDARG);
 683         writel(S3C2410_SDIDCON_STOP, host->base + S3C2410_SDIDCON);
 684         writel(0, host->base + S3C2410_SDICMDCON);
 685         writel(0, host->base + host->sdiimsk);
 686
 687         if (cmd->data && cmd->error)
 688                 cmd->data->error = cmd->error;
 689
 690         if (cmd->data && cmd->data->stop && (!host->cmd_is_stop)) {
 691                 host->cmd_is_stop = 1;
 692                 s3cmci_send_request(host->mmc);
 693                 return;
 694         }
 695
 696         /* If we have no data transfer we are finished here */
 697         if (!mrq->data)
 698                 goto request_done;
 699
 700         /* Calulate the amout of bytes transfer if there was no error */
 701         if (mrq->data->error == 0) {
 702                 mrq->data->bytes_xfered =
 703                         (mrq->data->blocks * mrq->data->blksz);
 704         } else {
 705                 mrq->data->bytes_xfered = 0;
 706         }
 707
 708         /* If we had an error while transfering data we flush the
 709          * DMA channel and the fifo to clear out any garbage. */
 710         if (mrq->data->error != 0) {
 711                 if (host->dodma)
 712                         s3c2410_dma_ctrl(host->dma, S3C2410_DMAOP_FLUSH);
 713
 714                 if (host->is2440) {
 715                         /* Clear failure register and reset fifo. */
 716                         writel(S3C2440_SDIFSTA_FIFORESET |
 717                                S3C2440_SDIFSTA_FIFOFAIL,
 718                                host->base + S3C2410_SDIFSTA);
 719                 } else {
 720                         u32 mci_con;
 721
 722                         /* reset fifo */
 723                         mci_con = readl(host->base + S3C2410_SDICON);
 724                         mci_con |= S3C2410_SDICON_FIFORESET;
 725
 726                         writel(mci_con, host->base + S3C2410_SDICON);
 727                 }
 728         }
 729
 730 request_done:
 731         host->complete_what = COMPLETION_NONE;
 732         host->mrq = NULL;
 733         mmc_request_done(host->mmc, mrq);
 734 }
 735
 736
 737 void s3cmci_dma_setup(struct s3cmci_host *host, enum s3c2410_dmasrc source)
 738 {
 739         static enum s3c2410_dmasrc last_source = -1;
 740         static int setup_ok;
 741
 742         if (last_source == source)
 743                 return;
 744
 745         last_source = source;
 746
 747         s3c2410_dma_devconfig(host->dma, source, 3,
 748                               host->mem->start + host->sdidata);
 749
 750         if (!setup_ok) {
 751                 s3c2410_dma_config(host->dma, 4,
 752                         (S3C2410_DCON_HWTRIG | S3C2410_DCON_CH0_SDI));
 753                 s3c2410_dma_set_buffdone_fn(host->dma,
 754                                             s3cmci_dma_done_callback);
 755                 s3c2410_dma_setflags(host->dma, S3C2410_DMAF_AUTOSTART);
 756                 setup_ok = 1;
 757         }
 758 }
 759
 760 static void s3cmci_send_command(struct s3cmci_host *host,
 761                                         struct mmc_command *cmd)
 762 {
 763         u32 ccon, imsk;
 764
 765         imsk  = S3C2410_SDIIMSK_CRCSTATUS | S3C2410_SDIIMSK_CMDTIMEOUT |
 766                 S3C2410_SDIIMSK_RESPONSEND | S3C2410_SDIIMSK_CMDSENT |
 767                 S3C2410_SDIIMSK_RESPONSECRC;
 768
 769         enable_imask(host, imsk);
 770
 771         if (cmd->data)
 772                 host->complete_what = COMPLETION_XFERFINISH_RSPFIN;
 773         else if (cmd->flags & MMC_RSP_PRESENT)
 774                 host->complete_what = COMPLETION_RSPFIN;
 775         else
 776                 host->complete_what = COMPLETION_CMDSENT;
 777
 778         writel(cmd->arg, host->base + S3C2410_SDICMDARG);
 779
 780         ccon  = cmd->opcode & S3C2410_SDICMDCON_INDEX;
 781         ccon |= S3C2410_SDICMDCON_SENDERHOST | S3C2410_SDICMDCON_CMDSTART;
 782
 783         if (cmd->flags & MMC_RSP_PRESENT)
 784                 ccon |= S3C2410_SDICMDCON_WAITRSP;
 785
 786         if (cmd->flags & MMC_RSP_136)
 787                 ccon |= S3C2410_SDICMDCON_LONGRSP;
 788
 789         writel(ccon, host->base + S3C2410_SDICMDCON);
 790 }
 791
 792 static int s3cmci_setup_data(struct s3cmci_host *host, struct mmc_data *data)
 793 {
 794         u32 dcon, imsk, stoptries = 3;
 795
 796         /* write DCON register */
 797
 798         if (!data) {
 799                 writel(0, host->base + S3C2410_SDIDCON);
 800                 return 0;
 801         }
 802
 803         while (readl(host->base + S3C2410_SDIDSTA) &
 804                (S3C2410_SDIDSTA_TXDATAON | S3C2410_SDIDSTA_RXDATAON)) {
 805
 806                 dbg(host, dbg_err,
 807                     "mci_setup_data() transfer stillin progress.\n");
 808
 809                 writel(S3C2410_SDIDCON_STOP, host->base + S3C2410_SDIDCON);
 810                 s3cmci_reset(host);
 811
 812                 if ((stoptries--) == 0) {
 813                         dbg_dumpregs(host, "DRF");
 814                         return -EINVAL;
 815                 }
 816         }
 817
 818         dcon  = data->blocks & S3C2410_SDIDCON_BLKNUM_MASK;
 819
 820         if (host->dodma)
 821                 dcon |= S3C2410_SDIDCON_DMAEN;
 822
 823         if (host->bus_width == MMC_BUS_WIDTH_4)
 824                 dcon |= S3C2410_SDIDCON_WIDEBUS;
 825
 826         if (!(data->flags & MMC_DATA_STREAM))
 827                 dcon |= S3C2410_SDIDCON_BLOCKMODE;
 828
 829         if (data->flags & MMC_DATA_WRITE) {
 830                 dcon |= S3C2410_SDIDCON_TXAFTERRESP;
 831                 dcon |= S3C2410_SDIDCON_XFER_TXSTART;
 832         }
 833
 834         if (data->flags & MMC_DATA_READ) {
 835                 dcon |= S3C2410_SDIDCON_RXAFTERCMD;
 836                 dcon |= S3C2410_SDIDCON_XFER_RXSTART;
 837         }
 838
 839         if (host->is2440) {
 840                 dcon |= S3C2440_SDIDCON_DS_WORD;
 841                 dcon |= S3C2440_SDIDCON_DATSTART;
 842         }
 843
 844         writel(dcon, host->base + S3C2410_SDIDCON);
 845
 846         /* write BSIZE register */
 847
 848         writel(data->blksz, host->base + S3C2410_SDIBSIZE);
 849
 850         /* add to IMASK register */
 851         imsk = S3C2410_SDIIMSK_FIFOFAIL | S3C2410_SDIIMSK_DATACRC |
 852                S3C2410_SDIIMSK_DATATIMEOUT | S3C2410_SDIIMSK_DATAFINISH;
 853
 854         enable_imask(host, imsk);
 855
 856         /* write TIMER register */
 857
 858         if (host->is2440) {
 859                 writel(0x007FFFFF, host->base + S3C2410_SDITIMER);
 860         } else {
 861                 writel(0x0000FFFF, host->base + S3C2410_SDITIMER);
 862
 863                 /* FIX: set slow clock to prevent timeouts on read */
 864                 if (data->flags & MMC_DATA_READ)
 865                         writel(0xFF, host->base + S3C2410_SDIPRE);
 866         }
 867
 868         return 0;
 869 }
 870
 871 #define BOTH_DIR (MMC_DATA_WRITE | MMC_DATA_READ)
 872
 873 static int s3cmci_prepare_pio(struct s3cmci_host *host, struct mmc_data *data)
 874 {
 875         int rw = (data->flags & MMC_DATA_WRITE) ? 1 : 0;
 876
 877         BUG_ON((data->flags & BOTH_DIR) == BOTH_DIR);
 878
 879         host->pio_sgptr = 0;
 880         host->pio_words = 0;
 881         host->pio_count = 0;
 882         host->pio_active = rw ? XFER_WRITE : XFER_READ;
 883
 884         if (rw) {
 885                 do_pio_write(host);
 886                 enable_imask(host, S3C2410_SDIIMSK_TXFIFOHALF);
 887         } else {
 888                 enable_imask(host, S3C2410_SDIIMSK_RXFIFOHALF
 889                              | S3C2410_SDIIMSK_RXFIFOLAST);
 890         }
 891
 892         return 0;
 893 }
 894
 895 static int s3cmci_prepare_dma(struct s3cmci_host *host, struct mmc_data *data)
 896 {
 897         int dma_len, i;
 898         int rw = (data->flags & MMC_DATA_WRITE) ? 1 : 0;
 899
 900         BUG_ON((data->flags & BOTH_DIR) == BOTH_DIR);
 901
 902         s3cmci_dma_setup(host, rw ? S3C2410_DMASRC_MEM : S3C2410_DMASRC_HW);
 903         s3c2410_dma_ctrl(host->dma, S3C2410_DMAOP_FLUSH);
 904
 905         dma_len = dma_map_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
 906                              (rw) ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
 907
 908         if (dma_len == 0)
 909                 return -ENOMEM;
 910
 911         host->dma_complete = 0;
 912         host->dmatogo = dma_len;
 913
 914         for (i = 0; i < dma_len; i++) {
 915                 int res;
 916
 917                 dbg(host, dbg_dma, "enqueue %i:%u@%u\n", i,
 918                         sg_dma_address(&data->sg[i]),
 919                         sg_dma_len(&data->sg[i]));
 920
 921                 res = s3c2410_dma_enqueue(host->dma, (void *) host,
 922                                           sg_dma_address(&data->sg[i]),
 923                                           sg_dma_len(&data->sg[i]));
 924
 925                 if (res) {
 926                         s3c2410_dma_ctrl(host->dma, S3C2410_DMAOP_FLUSH);
 927                         return -EBUSY;
 928                 }
 929         }
 930
 931         s3c2410_dma_ctrl(host->dma, S3C2410_DMAOP_START);
 932
 933         return 0;
 934 }
 935
 936 static void s3cmci_send_request(struct mmc_host *mmc)
 937 {
 938         struct s3cmci_host *host = mmc_priv(mmc);
 939         struct mmc_request *mrq = host->mrq;
 940         struct mmc_command *cmd = host->cmd_is_stop ? mrq->stop : mrq->cmd;
 941
 942         host->ccnt++;
 943         prepare_dbgmsg(host, cmd, host->cmd_is_stop);
 944
 945         /* Clear command, data and fifo status registers
 946            Fifo clear only necessary on 2440, but doesn't hurt on 2410
 947         */
 948         writel(0xFFFFFFFF, host->base + S3C2410_SDICMDSTAT);
 949         writel(0xFFFFFFFF, host->base + S3C2410_SDIDSTA);
 950         writel(0xFFFFFFFF, host->base + S3C2410_SDIFSTA);
 951
 952         if (cmd->data) {
 953                 int res = s3cmci_setup_data(host, cmd->data);
 954
 955                 host->dcnt++;
 956
 957                 if (res) {
 958                         cmd->error = -EINVAL;
 959                         cmd->data->error = -EINVAL;
 960
 961                         mmc_request_done(mmc, mrq);
 962                         return;
 963                 }
 964
 965                 if (host->dodma)
 966                         res = s3cmci_prepare_dma(host, cmd->data);
 967                 else
 968                         res = s3cmci_prepare_pio(host, cmd->data);
 969
 970                 if (res) {
 971                         cmd->error = res;
 972                         cmd->data->error = res;
 973
 974                         mmc_request_done(mmc, mrq);
 975                         return;
 976                 }
 977         }
 978
 979         /* Send command */
 980         s3cmci_send_command(host, cmd);
 981
 982         /* Enable Interrupt */
 983         enable_irq(host->irq);
 984 }
 985
 986 static void s3cmci_request(struct mmc_host *mmc, struct mmc_request *mrq)
 987 {
 988         struct s3cmci_host *host = mmc_priv(mmc);
 989
 990         host->status = "mmc request";
 991         host->cmd_is_stop = 0;
 992         host->mrq = mrq;
 993
 994         s3cmci_send_request(mmc);
 995 }
 996
 997 static void s3cmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 998 {
 999         struct s3cmci_host *host = mmc_priv(mmc);
1000         u32 mci_psc, mci_con;
1001
1002         /* Set the power state */
1003
1004         mci_con = readl(host->base + S3C2410_SDICON);
1005
1006         switch (ios->power_mode) {
1007         case MMC_POWER_ON:
1008         case MMC_POWER_UP:
1009                 s3c2410_gpio_cfgpin(S3C2410_GPE5, S3C2410_GPE5_SDCLK);
1010                 s3c2410_gpio_cfgpin(S3C2410_GPE6, S3C2410_GPE6_SDCMD);
1011                 s3c2410_gpio_cfgpin(S3C2410_GPE7, S3C2410_GPE7_SDDAT0);
1012                 s3c2410_gpio_cfgpin(S3C2410_GPE8, S3C2410_GPE8_SDDAT1);
1013                 s3c2410_gpio_cfgpin(S3C2410_GPE9, S3C2410_GPE9_SDDAT2);
1014                 s3c2410_gpio_cfgpin(S3C2410_GPE10, S3C2410_GPE10_SDDAT3);
1015
1016                 if (host->pdata->set_power)
1017                         host->pdata->set_power(ios->power_mode, ios->vdd);
1018
1019                 if (!host->is2440)
1020                         mci_con |= S3C2410_SDICON_FIFORESET;
1021
1022                 break;
1023
1024         case MMC_POWER_OFF:
1025         default:
1026                 s3c2410_gpio_setpin(S3C2410_GPE5, 0);
1027                 s3c2410_gpio_cfgpin(S3C2410_GPE5, S3C2410_GPE5_OUTP);
1028
1029                 if (host->is2440)
1030                         mci_con |= S3C2440_SDICON_SDRESET;
1031
1032                 if (host->pdata->set_power)
1033                         host->pdata->set_power(ios->power_mode, ios->vdd);
1034
1035                 break;
1036         }
1037
1038         /* Set clock */
1039         for (mci_psc = 0; mci_psc < 255; mci_psc++) {
1040                 host->real_rate = host->clk_rate / (host->clk_div*(mci_psc+1));
1041
1042                 if (host->real_rate <= ios->clock)
1043                         break;
1044         }
1045
1046         if (mci_psc > 255)
1047                 mci_psc = 255;
1048
1049         host->prescaler = mci_psc;
1050         writel(host->prescaler, host->base + S3C2410_SDIPRE);
1051
1052         /* If requested clock is 0, real_rate will be 0, too */
1053         if (ios->clock == 0)
1054                 host->real_rate = 0;
1055
1056         /* Set CLOCK_ENABLE */
1057         if (ios->clock)
1058                 mci_con |= S3C2410_SDICON_CLOCKTYPE;
1059         else
1060                 mci_con &= ~S3C2410_SDICON_CLOCKTYPE;
1061
1062         writel(mci_con, host->base + S3C2410_SDICON);
1063
1064         if ((ios->power_mode == MMC_POWER_ON) ||
1065             (ios->power_mode == MMC_POWER_UP)) {
1066                 dbg(host, dbg_conf, "running at %lukHz (requested: %ukHz).\n",
1067                         host->real_rate/1000, ios->clock/1000);
1068         } else {
1069                 dbg(host, dbg_conf, "powered down.\n");
1070         }
1071
1072         host->bus_width = ios->bus_width;
1073 }
1074
1075 static void s3cmci_reset(struct s3cmci_host *host)
1076 {
1077         u32 con = readl(host->base + S3C2410_SDICON);
1078
1079         con |= S3C2440_SDICON_SDRESET;
1080         writel(con, host->base + S3C2410_SDICON);
1081 }
1082
1083 static int s3cmci_get_ro(struct mmc_host *mmc)
1084 {
1085         struct s3cmci_host *host = mmc_priv(mmc);
1086
1087         if (host->pdata->gpio_wprotect == 0)
1088                 return 0;
1089
1090         return s3c2410_gpio_getpin(host->pdata->gpio_wprotect);
1091 }
1092
1093 static struct mmc_host_ops s3cmci_ops = {
1094         .request        = s3cmci_request,
1095         .set_ios        = s3cmci_set_ios,
1096         .get_ro         = s3cmci_get_ro,
1097 };
1098
1099 static struct s3c24xx_mci_pdata s3cmci_def_pdata = {
1100         /* This is currently here to avoid a number of if (host->pdata)
1101          * checks. Any zero fields to ensure reaonable defaults are picked. */
1102 };
1103
1104 static int __devinit s3cmci_probe(struct platform_device *pdev, int is2440)
1105 {
1106         struct s3cmci_host *host;
1107         struct mmc_host *mmc;
1108         int ret;
1109
1110         mmc = mmc_alloc_host(sizeof(struct s3cmci_host), &pdev->dev);
1111         if (!mmc) {
1112                 ret = -ENOMEM;
1113                 goto probe_out;
1114         }
1115
1116         host = mmc_priv(mmc);
1117         host->mmc       = mmc;
1118         host->pdev      = pdev;
1119         host->is2440    = is2440;
1120
1121         host->pdata = pdev->dev.platform_data;
1122         if (!host->pdata) {
1123                 pdev->dev.platform_data = &s3cmci_def_pdata;
1124                 host->pdata = &s3cmci_def_pdata;
1125         }
1126
1127         spin_lock_init(&host->complete_lock);
1128         tasklet_init(&host->pio_tasklet, pio_tasklet, (unsigned long) host);
1129
1130         if (is2440) {
1131                 host->sdiimsk   = S3C2440_SDIIMSK;
1132                 host->sdidata   = S3C2440_SDIDATA;
1133                 host->clk_div   = 1;
1134         } else {
1135                 host->sdiimsk   = S3C2410_SDIIMSK;
1136                 host->sdidata   = S3C2410_SDIDATA;
1137                 host->clk_div   = 2;
1138         }
1139
1140         host->dodma             = 0;
1141         host->complete_what     = COMPLETION_NONE;
1142         host->pio_active        = XFER_NONE;
1143
1144         host->dma               = S3CMCI_DMA;
1145         host->irq_cd = s3c2410_gpio_getirq(host->pdata->gpio_detect);
1146         s3c2410_gpio_cfgpin(host->pdata->gpio_detect, S3C2410_GPIO_IRQ);
1147
1148         host->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1149         if (!host->mem) {
1150                 dev_err(&pdev->dev,
1151                         "failed to get io memory region resouce.\n");
1152
1153                 ret = -ENOENT;
1154                 goto probe_free_host;
1155         }
1156
1157         host->mem = request_mem_region(host->mem->start,
1158                                        RESSIZE(host->mem), pdev->name);
1159
1160         if (!host->mem) {
1161                 dev_err(&pdev->dev, "failed to request io memory region.\n");
1162                 ret = -ENOENT;
1163                 goto probe_free_host;
1164         }
1165
1166         host->base = ioremap(host->mem->start, RESSIZE(host->mem));
1167         if (host->base == 0) {
1168                 dev_err(&pdev->dev, "failed to ioremap() io memory region.\n");
1169                 ret = -EINVAL;
1170                 goto probe_free_mem_region;
1171         }
1172
1173         host->irq = platform_get_irq(pdev, 0);
1174         if (host->irq == 0) {
1175                 dev_err(&pdev->dev, "failed to get interrupt resouce.\n");
1176                 ret = -EINVAL;
1177                 goto probe_iounmap;
1178         }
1179
1180         if (request_irq(host->irq, s3cmci_irq, 0, DRIVER_NAME, host)) {
1181                 dev_err(&pdev->dev, "failed to request mci interrupt.\n");
1182                 ret = -ENOENT;
1183                 goto probe_iounmap;
1184         }
1185
1186         /* We get spurious interrupts even when we have set the IMSK
1187          * register to ignore everything, so use disable_irq() to make
1188          * ensure we don't lock the system with un-serviceable requests. */
1189
1190         disable_irq(host->irq);
1191
1192         s3c2410_gpio_cfgpin(host->pdata->gpio_detect, S3C2410_GPIO_IRQ);
1193         set_irq_type(host->irq_cd, IRQT_BOTHEDGE);
1194
1195         if (request_irq(host->irq_cd, s3cmci_irq_cd, 0, DRIVER_NAME, host)) {
1196                 dev_err(&pdev->dev,
1197                         "failed to request card detect interrupt.\n");
1198                 ret = -ENOENT;
1199                 goto probe_free_irq;
1200         }
1201
1202         if (host->pdata->gpio_wprotect)
1203                 s3c2410_gpio_cfgpin(host->pdata->gpio_wprotect,
1204                                     S3C2410_GPIO_INPUT);
1205
1206         if (s3c2410_dma_request(S3CMCI_DMA, &s3cmci_dma_client, NULL)) {
1207                 dev_err(&pdev->dev, "unable to get DMA channel.\n");
1208                 ret = -EBUSY;
1209                 goto probe_free_irq_cd;
1210         }
1211
1212         host->clk = clk_get(&pdev->dev, "sdi");
1213         if (IS_ERR(host->clk)) {
1214                 dev_err(&pdev->dev, "failed to find clock source.\n");
1215                 ret = PTR_ERR(host->clk);
1216                 host->clk = NULL;
1217                 goto probe_free_host;
1218         }
1219
1220         ret = clk_enable(host->clk);
1221         if (ret) {
1222                 dev_err(&pdev->dev, "failed to enable clock source.\n");
1223                 goto clk_free;
1224         }
1225
1226         host->clk_rate = clk_get_rate(host->clk);
1227
1228         mmc->ops        = &s3cmci_ops;
1229         mmc->ocr_avail  = MMC_VDD_32_33 | MMC_VDD_33_34;
1230         mmc->caps       = MMC_CAP_4_BIT_DATA;
1231         mmc->f_min      = host->clk_rate / (host->clk_div * 256);
1232         mmc->f_max      = host->clk_rate / host->clk_div;
1233
1234         if (host->pdata->ocr_avail)
1235                 mmc->ocr_avail = host->pdata->ocr_avail;
1236
1237         mmc->max_blk_count      = 4095;
1238         mmc->max_blk_size       = 4095;
1239         mmc->max_req_size       = 4095 * 512;
1240         mmc->max_seg_size       = mmc->max_req_size;
1241
1242         mmc->max_phys_segs      = 128;
1243         mmc->max_hw_segs        = 128;
1244
1245         dbg(host, dbg_debug,
1246             "probe: mode:%s mapped mci_base:%p irq:%u irq_cd:%u dma:%u.\n",
1247             (host->is2440?"2440":""),
1248             host->base, host->irq, host->irq_cd, host->dma);
1249
1250         ret = mmc_add_host(mmc);
1251         if (ret) {
1252                 dev_err(&pdev->dev, "failed to add mmc host.\n");
1253                 goto free_dmabuf;
1254         }
1255
1256         platform_set_drvdata(pdev, mmc);
1257         dev_info(&pdev->dev, "initialisation done.\n");
1258
1259         return 0;
1260
1261  free_dmabuf:
1262         clk_disable(host->clk);
1263
1264  clk_free:
1265         clk_put(host->clk);
1266
1267  probe_free_irq_cd:
1268         free_irq(host->irq_cd, host);
1269
1270  probe_free_irq:
1271         free_irq(host->irq, host);
1272
1273  probe_iounmap:
1274         iounmap(host->base);
1275
1276  probe_free_mem_region:
1277         release_mem_region(host->mem->start, RESSIZE(host->mem));
1278
1279  probe_free_host:
1280         mmc_free_host(mmc);
1281  probe_out:
1282         return ret;
1283 }
1284
1285 static int __devexit s3cmci_remove(struct platform_device *pdev)
1286 {
1287         struct mmc_host         *mmc  = platform_get_drvdata(pdev);
1288         struct s3cmci_host      *host = mmc_priv(mmc);
1289
1290         mmc_remove_host(mmc);
1291
1292         clk_disable(host->clk);
1293         clk_put(host->clk);
1294
1295         tasklet_disable(&host->pio_tasklet);
1296         s3c2410_dma_free(S3CMCI_DMA, &s3cmci_dma_client);
1297
1298         free_irq(host->irq_cd, host);
1299         free_irq(host->irq, host);
1300
1301         iounmap(host->base);
1302         release_mem_region(host->mem->start, RESSIZE(host->mem));
1303
1304         mmc_free_host(mmc);
1305         return 0;
1306 }
1307
1308 static int __devinit s3cmci_probe_2410(struct platform_device *dev)
1309 {
1310         return s3cmci_probe(dev, 0);
1311 }
1312
1313 static int __devinit s3cmci_probe_2412(struct platform_device *dev)
1314 {
1315         return s3cmci_probe(dev, 1);
1316 }
1317
1318 static int __devinit s3cmci_probe_2440(struct platform_device *dev)
1319 {
1320         return s3cmci_probe(dev, 1);
1321 }
1322
1323 #ifdef CONFIG_PM
1324
1325 static int s3cmci_suspend(struct platform_device *dev, pm_message_t state)
1326 {
1327         struct mmc_host *mmc = platform_get_drvdata(dev);
1328
1329         return  mmc_suspend_host(mmc, state);
1330 }
1331
1332 static int s3cmci_resume(struct platform_device *dev)
1333 {
1334         struct mmc_host *mmc = platform_get_drvdata(dev);
1335
1336         return mmc_resume_host(mmc);
1337 }
1338
1339 #else /* CONFIG_PM */
1340 #define s3cmci_suspend NULL
1341 #define s3cmci_resume NULL
1342 #endif /* CONFIG_PM */
1343
1344
1345 static struct platform_driver s3cmci_driver_2410 = {
1346         .driver.name    = "s3c2410-sdi",
1347         .driver.owner   = THIS_MODULE,
1348         .probe          = s3cmci_probe_2410,
1349         .remove         = __devexit_p(s3cmci_remove),
1350         .suspend        = s3cmci_suspend,
1351         .resume         = s3cmci_resume,
1352 };
1353
1354 static struct platform_driver s3cmci_driver_2412 = {
1355         .driver.name    = "s3c2412-sdi",
1356         .driver.owner   = THIS_MODULE,
1357         .probe          = s3cmci_probe_2412,
1358         .remove         = __devexit_p(s3cmci_remove),
1359         .suspend        = s3cmci_suspend,
1360         .resume         = s3cmci_resume,
1361 };
1362
1363 static struct platform_driver s3cmci_driver_2440 = {
1364         .driver.name    = "s3c2440-sdi",
1365         .driver.owner   = THIS_MODULE,
1366         .probe          = s3cmci_probe_2440,
1367         .remove         = __devexit_p(s3cmci_remove),
1368         .suspend        = s3cmci_suspend,
1369         .resume         = s3cmci_resume,
1370 };
1371
1372
1373 static int __init s3cmci_init(void)
1374 {
1375         platform_driver_register(&s3cmci_driver_2410);
1376         platform_driver_register(&s3cmci_driver_2412);
1377         platform_driver_register(&s3cmci_driver_2440);
1378         return 0;
1379 }
1380
1381 static void __exit s3cmci_exit(void)
1382 {
1383         platform_driver_unregister(&s3cmci_driver_2410);
1384         platform_driver_unregister(&s3cmci_driver_2412);
1385         platform_driver_unregister(&s3cmci_driver_2440);
1386 }
1387
1388 module_init(s3cmci_init);
1389 module_exit(s3cmci_exit);
1390
1391 MODULE_DESCRIPTION("Samsung S3C MMC/SD Card Interface driver");
1392 MODULE_LICENSE("GPL v2");
1393 MODULE_AUTHOR("Thomas Kleffel <tk@maintech.de>");