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   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  * Current driver maintained by Ben Dooks and Simtec Electronics
   7  *  Copyright (C) 2008 Simtec Electronics <ben-linux@fluff.org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/dma-mapping.h>
  16 #include <linux/clk.h>
  17 #include <linux/mmc/host.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/cpufreq.h>
  20 #include <linux/debugfs.h>
  21 #include <linux/seq_file.h>
  22 #include <linux/gpio.h>
  23 #include <linux/irq.h>
  24 #include <linux/io.h>
  25
  26 #include <mach/dma.h>
  27
  28 #include <mach/regs-sdi.h>
  29 #include <mach/regs-gpio.h>
  30
  31 #include <plat/mci.h>
  32
  33 #include "s3cmci.h"
  34
  35 #define DRIVER_NAME "s3c-mci"
  36
  37 enum dbg_channels {
  38         dbg_err   = (1 << 0),
  39         dbg_debug = (1 << 1),
  40         dbg_info  = (1 << 2),
  41         dbg_irq   = (1 << 3),
  42         dbg_sg    = (1 << 4),
  43         dbg_dma   = (1 << 5),
  44         dbg_pio   = (1 << 6),
  45         dbg_fail  = (1 << 7),
  46         dbg_conf  = (1 << 8),
  47 };
  48
  49 static const int dbgmap_err   = dbg_fail;
  50 static const int dbgmap_info  = dbg_info | dbg_conf;
  51 static const int dbgmap_debug = dbg_err | dbg_debug;
  52
  53 #define dbg(host, channels, args...)              \
  54         do {                                      \
  55         if (dbgmap_err & channels)                \
  56                 dev_err(&host->pdev->dev, args);  \
  57         else if (dbgmap_info & channels)          \
  58                 dev_info(&host->pdev->dev, args); \
  59         else if (dbgmap_debug & channels)         \
  60                 dev_dbg(&host->pdev->dev, args);  \
  61         } while (0)
  62
  63 static struct s3c2410_dma_client s3cmci_dma_client = {
  64         .name           = "s3c-mci",
  65 };
  66
  67 static void finalize_request(struct s3cmci_host *host);
  68 static void s3cmci_send_request(struct mmc_host *mmc);
  69 static void s3cmci_reset(struct s3cmci_host *host);
  70
  71 #ifdef CONFIG_MMC_DEBUG
  72
  73 static void dbg_dumpregs(struct s3cmci_host *host, char *prefix)
  74 {
  75         u32 con, pre, cmdarg, cmdcon, cmdsta, r0, r1, r2, r3, timer, bsize;
  76         u32 datcon, datcnt, datsta, fsta, imask;
  77
  78         con     = readl(host->base + S3C2410_SDICON);
  79         pre     = readl(host->base + S3C2410_SDIPRE);
  80         cmdarg  = readl(host->base + S3C2410_SDICMDARG);
  81         cmdcon  = readl(host->base + S3C2410_SDICMDCON);
  82         cmdsta  = readl(host->base + S3C2410_SDICMDSTAT);
  83         r0      = readl(host->base + S3C2410_SDIRSP0);
  84         r1      = readl(host->base + S3C2410_SDIRSP1);
  85         r2      = readl(host->base + S3C2410_SDIRSP2);
  86         r3      = readl(host->base + S3C2410_SDIRSP3);
  87         timer   = readl(host->base + S3C2410_SDITIMER);
  88         bsize   = readl(host->base + S3C2410_SDIBSIZE);
  89         datcon  = readl(host->base + S3C2410_SDIDCON);
  90         datcnt  = readl(host->base + S3C2410_SDIDCNT);
  91         datsta  = readl(host->base + S3C2410_SDIDSTA);
  92         fsta    = readl(host->base + S3C2410_SDIFSTA);
  93         imask   = readl(host->base + host->sdiimsk);
  94
  95         dbg(host, dbg_debug, "%s  CON:[%08x]  PRE:[%08x]  TMR:[%08x]\n",
  96                                 prefix, con, pre, timer);
  97
  98         dbg(host, dbg_debug, "%s CCON:[%08x] CARG:[%08x] CSTA:[%08x]\n",
  99                                 prefix, cmdcon, cmdarg, cmdsta);
 100
 101         dbg(host, dbg_debug, "%s DCON:[%08x] FSTA:[%08x]"
 102                                " DSTA:[%08x] DCNT:[%08x]\n",
 103                                 prefix, datcon, fsta, datsta, datcnt);
 104
 105         dbg(host, dbg_debug, "%s   R0:[%08x]   R1:[%08x]"
 106                                "   R2:[%08x]   R3:[%08x]\n",
 107                                 prefix, r0, r1, r2, r3);
 108 }
 109
 110 static void prepare_dbgmsg(struct s3cmci_host *host, struct mmc_command *cmd,
 111                            int stop)
 112 {
 113         snprintf(host->dbgmsg_cmd, 300,
 114                  "#%u%s op:%i arg:0x%08x flags:0x08%x retries:%u",
 115                  host->ccnt, (stop ? " (STOP)" : ""),
 116                  cmd->opcode, cmd->arg, cmd->flags, cmd->retries);
 117
 118         if (cmd->data) {
 119                 snprintf(host->dbgmsg_dat, 300,
 120                          "#%u bsize:%u blocks:%u bytes:%u",
 121                          host->dcnt, cmd->data->blksz,
 122                          cmd->data->blocks,
 123                          cmd->data->blocks * cmd->data->blksz);
 124         } else {
 125                 host->dbgmsg_dat[0] = '\0';
 126         }
 127 }
 128
 129 static void dbg_dumpcmd(struct s3cmci_host *host, struct mmc_command *cmd,
 130                         int fail)
 131 {
 132         unsigned int dbglvl = fail ? dbg_fail : dbg_debug;
 133
 134         if (!cmd)
 135                 return;
 136
 137         if (cmd->error == 0) {
 138                 dbg(host, dbglvl, "CMD[OK] %s R0:0x%08x\n",
 139                         host->dbgmsg_cmd, cmd->resp[0]);
 140         } else {
 141                 dbg(host, dbglvl, "CMD[ERR %i] %s Status:%s\n",
 142                         cmd->error, host->dbgmsg_cmd, host->status);
 143         }
 144
 145         if (!cmd->data)
 146                 return;
 147
 148         if (cmd->data->error == 0) {
 149                 dbg(host, dbglvl, "DAT[OK] %s\n", host->dbgmsg_dat);
 150         } else {
 151                 dbg(host, dbglvl, "DAT[ERR %i] %s DCNT:0x%08x\n",
 152                         cmd->data->error, host->dbgmsg_dat,
 153                         readl(host->base + S3C2410_SDIDCNT));
 154         }
 155 }
 156 #else
 157 static void dbg_dumpcmd(struct s3cmci_host *host,
 158                         struct mmc_command *cmd, int fail) { }
 159
 160 static void prepare_dbgmsg(struct s3cmci_host *host, struct mmc_command *cmd,
 161                            int stop) { }
 162
 163 static void dbg_dumpregs(struct s3cmci_host *host, char *prefix) { }
 164
 165 #endif /* CONFIG_MMC_DEBUG */
 166
 167 /**
 168  * s3cmci_host_usedma - return whether the host is using dma or pio
 169  * @host: The host state
 170  *
 171  * Return true if the host is using DMA to transfer data, else false
 172  * to use PIO mode. Will return static data depending on the driver
 173  * configuration.
 174  */
 175 static inline bool s3cmci_host_usedma(struct s3cmci_host *host)
 176 {
 177 #ifdef CONFIG_MMC_S3C_PIO
 178         return false;
 179 #elif defined(CONFIG_MMC_S3C_DMA)
 180         return true;
 181 #else
 182         return host->dodma;
 183 #endif
 184 }
 185
 186 /**
 187  * s3cmci_host_canpio - return true if host has pio code available
 188  *
 189  * Return true if the driver has been compiled with the PIO support code
 190  * available.
 191  */
 192 static inline bool s3cmci_host_canpio(void)
 193 {
 194 #ifdef CONFIG_MMC_S3C_PIO
 195         return true;
 196 #else
 197         return false;
 198 #endif
 199 }
 200
 201 static inline u32 enable_imask(struct s3cmci_host *host, u32 imask)
 202 {
 203         u32 newmask;
 204
 205         newmask = readl(host->base + host->sdiimsk);
 206         newmask |= imask;
 207
 208         writel(newmask, host->base + host->sdiimsk);
 209
 210         return newmask;
 211 }
 212
 213 static inline u32 disable_imask(struct s3cmci_host *host, u32 imask)
 214 {
 215         u32 newmask;
 216
 217         newmask = readl(host->base + host->sdiimsk);
 218         newmask &= ~imask;
 219
 220         writel(newmask, host->base + host->sdiimsk);
 221
 222         return newmask;
 223 }
 224
 225 static inline void clear_imask(struct s3cmci_host *host)
 226 {
 227         u32 mask = readl(host->base + host->sdiimsk);
 228
 229         /* preserve the SDIO IRQ mask state */
 230         mask &= S3C2410_SDIIMSK_SDIOIRQ;
 231         writel(mask, host->base + host->sdiimsk);
 232 }
 233
 234 /**
 235  * s3cmci_check_sdio_irq - test whether the SDIO IRQ is being signalled
 236  * @host: The host to check.
 237  *
 238  * Test to see if the SDIO interrupt is being signalled in case the
 239  * controller has failed to re-detect a card interrupt. Read GPE8 and
 240  * see if it is low and if so, signal a SDIO interrupt.
 241  *
 242  * This is currently called if a request is finished (we assume that the
 243  * bus is now idle) and when the SDIO IRQ is enabled in case the IRQ is
 244  * already being indicated.
 245 */
 246 static void s3cmci_check_sdio_irq(struct s3cmci_host *host)
 247 {
 248         if (host->sdio_irqen) {
 249                 if (gpio_get_value(S3C2410_GPE(8)) == 0) {
 250                         printk(KERN_DEBUG "%s: signalling irq\n", __func__);
 251                         mmc_signal_sdio_irq(host->mmc);
 252                 }
 253         }
 254 }
 255
 256 static inline int get_data_buffer(struct s3cmci_host *host,
 257                                   u32 *bytes, u32 **pointer)
 258 {
 259         struct scatterlist *sg;
 260
 261         if (host->pio_active == XFER_NONE)
 262                 return -EINVAL;
 263
 264         if ((!host->mrq) || (!host->mrq->data))
 265                 return -EINVAL;
 266
 267         if (host->pio_sgptr >= host->mrq->data->sg_len) {
 268                 dbg(host, dbg_debug, "no more buffers (%i/%i)\n",
 269                       host->pio_sgptr, host->mrq->data->sg_len);
 270                 return -EBUSY;
 271         }
 272         sg = &host->mrq->data->sg[host->pio_sgptr];
 273
 274         *bytes = sg->length;
 275         *pointer = sg_virt(sg);
 276
 277         host->pio_sgptr++;
 278
 279         dbg(host, dbg_sg, "new buffer (%i/%i)\n",
 280             host->pio_sgptr, host->mrq->data->sg_len);
 281
 282         return 0;
 283 }
 284
 285 static inline u32 fifo_count(struct s3cmci_host *host)
 286 {
 287         u32 fifostat = readl(host->base + S3C2410_SDIFSTA);
 288
 289         fifostat &= S3C2410_SDIFSTA_COUNTMASK;
 290         return fifostat;
 291 }
 292
 293 static inline u32 fifo_free(struct s3cmci_host *host)
 294 {
 295         u32 fifostat = readl(host->base + S3C2410_SDIFSTA);
 296
 297         fifostat &= S3C2410_SDIFSTA_COUNTMASK;
 298         return 63 - fifostat;
 299 }
 300
 301 /**
 302  * s3cmci_enable_irq - enable IRQ, after having disabled it.
 303  * @host: The device state.
 304  * @more: True if more IRQs are expected from transfer.
 305  *
 306  * Enable the main IRQ if needed after it has been disabled.
 307  *
 308  * The IRQ can be one of the following states:
 309  *      - disabled during IDLE
 310  *      - disabled whilst processing data
 311  *      - enabled during transfer
 312  *      - enabled whilst awaiting SDIO interrupt detection
 313  */
 314 static void s3cmci_enable_irq(struct s3cmci_host *host, bool more)
 315 {
 316         unsigned long flags;
 317         bool enable = false;
 318
 319         local_irq_save(flags);
 320
 321         host->irq_enabled = more;
 322         host->irq_disabled = false;
 323
 324         enable = more | host->sdio_irqen;
 325
 326         if (host->irq_state != enable) {
 327                 host->irq_state = enable;
 328
 329                 if (enable)
 330                         enable_irq(host->irq);
 331                 else
 332                         disable_irq(host->irq);
 333         }
 334
 335         local_irq_restore(flags);
 336 }
 337
 338 /**
 339  *
 340  */
 341 static void s3cmci_disable_irq(struct s3cmci_host *host, bool transfer)
 342 {
 343         unsigned long flags;
 344
 345         local_irq_save(flags);
 346
 347         //printk(KERN_DEBUG "%s: transfer %d\n", __func__, transfer);
 348
 349         host->irq_disabled = transfer;
 350
 351         if (transfer && host->irq_state) {
 352                 host->irq_state = false;
 353                 disable_irq(host->irq);
 354         }
 355
 356         local_irq_restore(flags);
 357 }
 358
 359 static void do_pio_read(struct s3cmci_host *host)
 360 {
 361         int res;
 362         u32 fifo;
 363         u32 *ptr;
 364         u32 fifo_words;
 365         void __iomem *from_ptr;
 366
 367         /* write real prescaler to host, it might be set slow to fix */
 368         writel(host->prescaler, host->base + S3C2410_SDIPRE);
 369
 370         from_ptr = host->base + host->sdidata;
 371
 372         while ((fifo = fifo_count(host))) {
 373                 if (!host->pio_bytes) {
 374                         res = get_data_buffer(host, &host->pio_bytes,
 375                                               &host->pio_ptr);
 376                         if (res) {
 377                                 host->pio_active = XFER_NONE;
 378                                 host->complete_what = COMPLETION_FINALIZE;
 379
 380                                 dbg(host, dbg_pio, "pio_read(): "
 381                                     "complete (no more data).\n");
 382                                 return;
 383                         }
 384
 385                         dbg(host, dbg_pio,
 386                             "pio_read(): new target: [%i]@[%p]\n",
 387                             host->pio_bytes, host->pio_ptr);
 388                 }
 389
 390                 dbg(host, dbg_pio,
 391                     "pio_read(): fifo:[%02i] buffer:[%03i] dcnt:[%08X]\n",
 392                     fifo, host->pio_bytes,
 393                     readl(host->base + S3C2410_SDIDCNT));
 394
 395                 /* If we have reached the end of the block, we can
 396                  * read a word and get 1 to 3 bytes.  If we in the
 397                  * middle of the block, we have to read full words,
 398                  * otherwise we will write garbage, so round down to
 399                  * an even multiple of 4. */
 400                 if (fifo >= host->pio_bytes)
 401                         fifo = host->pio_bytes;
 402                 else
 403                         fifo -= fifo & 3;
 404
 405                 host->pio_bytes -= fifo;
 406                 host->pio_count += fifo;
 407
 408                 fifo_words = fifo >> 2;
 409                 ptr = host->pio_ptr;
 410                 while (fifo_words--)
 411                         *ptr++ = readl(from_ptr);
 412                 host->pio_ptr = ptr;
 413
 414                 if (fifo & 3) {
 415                         u32 n = fifo & 3;
 416                         u32 data = readl(from_ptr);
 417                         u8 *p = (u8 *)host->pio_ptr;
 418
 419                         while (n--) {
 420                                 *p++ = data;
 421                                 data >>= 8;
 422                         }
 423                 }
 424         }
 425
 426         if (!host->pio_bytes) {
 427                 res = get_data_buffer(host, &host->pio_bytes, &host->pio_ptr);
 428                 if (res) {
 429                         dbg(host, dbg_pio,
 430                             "pio_read(): complete (no more buffers).\n");
 431                         host->pio_active = XFER_NONE;
 432                         host->complete_what = COMPLETION_FINALIZE;
 433
 434                         return;
 435                 }
 436         }
 437
 438         enable_imask(host,
 439                      S3C2410_SDIIMSK_RXFIFOHALF | S3C2410_SDIIMSK_RXFIFOLAST);
 440 }
 441
 442 static void do_pio_write(struct s3cmci_host *host)
 443 {
 444         void __iomem *to_ptr;
 445         int res;
 446         u32 fifo;
 447         u32 *ptr;
 448
 449         to_ptr = host->base + host->sdidata;
 450
 451         while ((fifo = fifo_free(host)) > 3) {
 452                 if (!host->pio_bytes) {
 453                         res = get_data_buffer(host, &host->pio_bytes,
 454                                                         &host->pio_ptr);
 455                         if (res) {
 456                                 dbg(host, dbg_pio,
 457                                     "pio_write(): complete (no more data).\n");
 458                                 host->pio_active = XFER_NONE;
 459
 460                                 return;
 461                         }
 462
 463                         dbg(host, dbg_pio,
 464                             "pio_write(): new source: [%i]@[%p]\n",
 465                             host->pio_bytes, host->pio_ptr);
 466
 467                 }
 468
 469                 /* If we have reached the end of the block, we have to
 470                  * write exactly the remaining number of bytes.  If we
 471                  * in the middle of the block, we have to write full
 472                  * words, so round down to an even multiple of 4. */
 473                 if (fifo >= host->pio_bytes)
 474                         fifo = host->pio_bytes;
 475                 else
 476                         fifo -= fifo & 3;
 477
 478                 host->pio_bytes -= fifo;
 479                 host->pio_count += fifo;
 480
 481                 fifo = (fifo + 3) >> 2;
 482                 ptr = host->pio_ptr;
 483                 while (fifo--)
 484                         writel(*ptr++, to_ptr);
 485                 host->pio_ptr = ptr;
 486         }
 487
 488         enable_imask(host, S3C2410_SDIIMSK_TXFIFOHALF);
 489 }
 490
 491 static void pio_tasklet(unsigned long data)
 492 {
 493         struct s3cmci_host *host = (struct s3cmci_host *) data;
 494
 495         s3cmci_disable_irq(host, true);
 496
 497         if (host->pio_active == XFER_WRITE)
 498                 do_pio_write(host);
 499
 500         if (host->pio_active == XFER_READ)
 501                 do_pio_read(host);
 502
 503         if (host->complete_what == COMPLETION_FINALIZE) {
 504                 clear_imask(host);
 505                 if (host->pio_active != XFER_NONE) {
 506                         dbg(host, dbg_err, "unfinished %s "
 507                             "- pio_count:[%u] pio_bytes:[%u]\n",
 508                             (host->pio_active == XFER_READ) ? "read" : "write",
 509                             host->pio_count, host->pio_bytes);
 510
 511                         if (host->mrq->data)
 512                                 host->mrq->data->error = -EINVAL;
 513                 }
 514
 515                 s3cmci_enable_irq(host, false);
 516                 finalize_request(host);
 517         } else
 518                 s3cmci_enable_irq(host, true);
 519 }
 520
 521 /*
 522  * ISR for SDI Interface IRQ
 523  * Communication between driver and ISR works as follows:
 524  *   host->mrq                  points to current request
 525  *   host->complete_what        Indicates when the request is considered done
 526  *     COMPLETION_CMDSENT         when the command was sent
 527  *     COMPLETION_RSPFIN          when a response was received
 528  *     COMPLETION_XFERFINISH      when the data transfer is finished
 529  *     COMPLETION_XFERFINISH_RSPFIN both of the above.
 530  *   host->complete_request     is the completion-object the driver waits for
 531  *
 532  * 1) Driver sets up host->mrq and host->complete_what
 533  * 2) Driver prepares the transfer
 534  * 3) Driver enables interrupts
 535  * 4) Driver starts transfer
 536  * 5) Driver waits for host->complete_rquest
 537  * 6) ISR checks for request status (errors and success)
 538  * 6) ISR sets host->mrq->cmd->error and host->mrq->data->error
 539  * 7) ISR completes host->complete_request
 540  * 8) ISR disables interrupts
 541  * 9) Driver wakes up and takes care of the request
 542  *
 543  * Note: "->error"-fields are expected to be set to 0 before the request
 544  *       was issued by mmc.c - therefore they are only set, when an error
 545  *       contition comes up
 546  */
 547
 548 static irqreturn_t s3cmci_irq(int irq, void *dev_id)
 549 {
 550         struct s3cmci_host *host = dev_id;
 551         struct mmc_command *cmd;
 552         u32 mci_csta, mci_dsta, mci_fsta, mci_dcnt, mci_imsk;
 553         u32 mci_cclear = 0, mci_dclear;
 554         unsigned long iflags;
 555
 556         mci_dsta = readl(host->base + S3C2410_SDIDSTA);
 557         mci_imsk = readl(host->base + host->sdiimsk);
 558
 559         if (mci_dsta & S3C2410_SDIDSTA_SDIOIRQDETECT) {
 560                 if (mci_imsk & S3C2410_SDIIMSK_SDIOIRQ) {
 561                         mci_dclear = S3C2410_SDIDSTA_SDIOIRQDETECT;
 562                         writel(mci_dclear, host->base + S3C2410_SDIDSTA);
 563
 564                         mmc_signal_sdio_irq(host->mmc);
 565                         return IRQ_HANDLED;
 566                 }
 567         }
 568
 569         spin_lock_irqsave(&host->complete_lock, iflags);
 570
 571         mci_csta = readl(host->base + S3C2410_SDICMDSTAT);
 572         mci_dcnt = readl(host->base + S3C2410_SDIDCNT);
 573         mci_fsta = readl(host->base + S3C2410_SDIFSTA);
 574         mci_dclear = 0;
 575
 576         if ((host->complete_what == COMPLETION_NONE) ||
 577             (host->complete_what == COMPLETION_FINALIZE)) {
 578                 host->status = "nothing to complete";
 579                 clear_imask(host);
 580                 goto irq_out;
 581         }
 582
 583         if (!host->mrq) {
 584                 host->status = "no active mrq";
 585                 clear_imask(host);
 586                 goto irq_out;
 587         }
 588
 589         cmd = host->cmd_is_stop ? host->mrq->stop : host->mrq->cmd;
 590
 591         if (!cmd) {
 592                 host->status = "no active cmd";
 593                 clear_imask(host);
 594                 goto irq_out;
 595         }
 596
 597         if (!s3cmci_host_usedma(host)) {
 598                 if ((host->pio_active == XFER_WRITE) &&
 599                     (mci_fsta & S3C2410_SDIFSTA_TFDET)) {
 600
 601                         disable_imask(host, S3C2410_SDIIMSK_TXFIFOHALF);
 602                         tasklet_schedule(&host->pio_tasklet);
 603                         host->status = "pio tx";
 604                 }
 605
 606                 if ((host->pio_active == XFER_READ) &&
 607                     (mci_fsta & S3C2410_SDIFSTA_RFDET)) {
 608
 609                         disable_imask(host,
 610                                       S3C2410_SDIIMSK_RXFIFOHALF |
 611                                       S3C2410_SDIIMSK_RXFIFOLAST);
 612
 613                         tasklet_schedule(&host->pio_tasklet);
 614                         host->status = "pio rx";
 615                 }
 616         }
 617
 618         if (mci_csta & S3C2410_SDICMDSTAT_CMDTIMEOUT) {
 619                 dbg(host, dbg_err, "CMDSTAT: error CMDTIMEOUT\n");
 620                 cmd->error = -ETIMEDOUT;
 621                 host->status = "error: command timeout";
 622                 goto fail_transfer;
 623         }
 624
 625         if (mci_csta & S3C2410_SDICMDSTAT_CMDSENT) {
 626                 if (host->complete_what == COMPLETION_CMDSENT) {
 627                         host->status = "ok: command sent";
 628                         goto close_transfer;
 629                 }
 630
 631                 mci_cclear |= S3C2410_SDICMDSTAT_CMDSENT;
 632         }
 633
 634         if (mci_csta & S3C2410_SDICMDSTAT_CRCFAIL) {
 635                 if (cmd->flags & MMC_RSP_CRC) {
 636                         if (host->mrq->cmd->flags & MMC_RSP_136) {
 637                                 dbg(host, dbg_irq,
 638                                     "fixup: ignore CRC fail with long rsp\n");
 639                         } else {
 640                                 /* note, we used to fail the transfer
 641                                  * here, but it seems that this is just
 642                                  * the hardware getting it wrong.
 643                                  *
 644                                  * cmd->error = -EILSEQ;
 645                                  * host->status = "error: bad command crc";
 646                                  * goto fail_transfer;
 647                                 */
 648                         }
 649                 }
 650
 651                 mci_cclear |= S3C2410_SDICMDSTAT_CRCFAIL;
 652         }
 653
 654         if (mci_csta & S3C2410_SDICMDSTAT_RSPFIN) {
 655                 if (host->complete_what == COMPLETION_RSPFIN) {
 656                         host->status = "ok: command response received";
 657                         goto close_transfer;
 658                 }
 659
 660                 if (host->complete_what == COMPLETION_XFERFINISH_RSPFIN)
 661                         host->complete_what = COMPLETION_XFERFINISH;
 662
 663                 mci_cclear |= S3C2410_SDICMDSTAT_RSPFIN;
 664         }
 665
 666         /* errors handled after this point are only relevant
 667            when a data transfer is in progress */
 668
 669         if (!cmd->data)
 670                 goto clear_status_bits;
 671
 672         /* Check for FIFO failure */
 673         if (host->is2440) {
 674                 if (mci_fsta & S3C2440_SDIFSTA_FIFOFAIL) {
 675                         dbg(host, dbg_err, "FIFO failure\n");
 676                         host->mrq->data->error = -EILSEQ;
 677                         host->status = "error: 2440 fifo failure";
 678                         goto fail_transfer;
 679                 }
 680         } else {
 681                 if (mci_dsta & S3C2410_SDIDSTA_FIFOFAIL) {
 682                         dbg(host, dbg_err, "FIFO failure\n");
 683                         cmd->data->error = -EILSEQ;
 684                         host->status = "error:  fifo failure";
 685                         goto fail_transfer;
 686                 }
 687         }
 688
 689         if (mci_dsta & S3C2410_SDIDSTA_RXCRCFAIL) {
 690                 dbg(host, dbg_err, "bad data crc (outgoing)\n");
 691                 cmd->data->error = -EILSEQ;
 692                 host->status = "error: bad data crc (outgoing)";
 693                 goto fail_transfer;
 694         }
 695
 696         if (mci_dsta & S3C2410_SDIDSTA_CRCFAIL) {
 697                 dbg(host, dbg_err, "bad data crc (incoming)\n");
 698                 cmd->data->error = -EILSEQ;
 699                 host->status = "error: bad data crc (incoming)";
 700                 goto fail_transfer;
 701         }
 702
 703         if (mci_dsta & S3C2410_SDIDSTA_DATATIMEOUT) {
 704                 dbg(host, dbg_err, "data timeout\n");
 705                 cmd->data->error = -ETIMEDOUT;
 706                 host->status = "error: data timeout";
 707                 goto fail_transfer;
 708         }
 709
 710         if (mci_dsta & S3C2410_SDIDSTA_XFERFINISH) {
 711                 if (host->complete_what == COMPLETION_XFERFINISH) {
 712                         host->status = "ok: data transfer completed";
 713                         goto close_transfer;
 714                 }
 715
 716                 if (host->complete_what == COMPLETION_XFERFINISH_RSPFIN)
 717                         host->complete_what = COMPLETION_RSPFIN;
 718
 719                 mci_dclear |= S3C2410_SDIDSTA_XFERFINISH;
 720         }
 721
 722 clear_status_bits:
 723         writel(mci_cclear, host->base + S3C2410_SDICMDSTAT);
 724         writel(mci_dclear, host->base + S3C2410_SDIDSTA);
 725
 726         goto irq_out;
 727
 728 fail_transfer:
 729         host->pio_active = XFER_NONE;
 730
 731 close_transfer:
 732         host->complete_what = COMPLETION_FINALIZE;
 733
 734         clear_imask(host);
 735         tasklet_schedule(&host->pio_tasklet);
 736
 737         goto irq_out;
 738
 739 irq_out:
 740         dbg(host, dbg_irq,
 741             "csta:0x%08x dsta:0x%08x fsta:0x%08x dcnt:0x%08x status:%s.\n",
 742             mci_csta, mci_dsta, mci_fsta, mci_dcnt, host->status);
 743
 744         spin_unlock_irqrestore(&host->complete_lock, iflags);
 745         return IRQ_HANDLED;
 746
 747 }
 748
 749 /*
 750  * ISR for the CardDetect Pin
 751 */
 752
 753 static irqreturn_t s3cmci_irq_cd(int irq, void *dev_id)
 754 {
 755         struct s3cmci_host *host = (struct s3cmci_host *)dev_id;
 756
 757         dbg(host, dbg_irq, "card detect\n");
 758
 759         mmc_detect_change(host->mmc, msecs_to_jiffies(500));
 760
 761         return IRQ_HANDLED;
 762 }
 763
 764 static void s3cmci_dma_done_callback(struct s3c2410_dma_chan *dma_ch,
 765                                      void *buf_id, int size,
 766                                      enum s3c2410_dma_buffresult result)
 767 {
 768         struct s3cmci_host *host = buf_id;
 769         unsigned long iflags;
 770         u32 mci_csta, mci_dsta, mci_fsta, mci_dcnt;
 771
 772         mci_csta = readl(host->base + S3C2410_SDICMDSTAT);
 773         mci_dsta = readl(host->base + S3C2410_SDIDSTA);
 774         mci_fsta = readl(host->base + S3C2410_SDIFSTA);
 775         mci_dcnt = readl(host->base + S3C2410_SDIDCNT);
 776
 777         BUG_ON(!host->mrq);
 778         BUG_ON(!host->mrq->data);
 779         BUG_ON(!host->dmatogo);
 780
 781         spin_lock_irqsave(&host->complete_lock, iflags);
 782
 783         if (result != S3C2410_RES_OK) {
 784                 dbg(host, dbg_fail, "DMA FAILED: csta=0x%08x dsta=0x%08x "
 785                         "fsta=0x%08x dcnt:0x%08x result:0x%08x toGo:%u\n",
 786                         mci_csta, mci_dsta, mci_fsta,
 787                         mci_dcnt, result, host->dmatogo);
 788
 789                 goto fail_request;
 790         }
 791
 792         host->dmatogo--;
 793         if (host->dmatogo) {
 794                 dbg(host, dbg_dma, "DMA DONE  Size:%i DSTA:[%08x] "
 795                         "DCNT:[%08x] toGo:%u\n",
 796                         size, mci_dsta, mci_dcnt, host->dmatogo);
 797
 798                 goto out;
 799         }
 800
 801         dbg(host, dbg_dma, "DMA FINISHED Size:%i DSTA:%08x DCNT:%08x\n",
 802                 size, mci_dsta, mci_dcnt);
 803
 804         host->dma_complete = 1;
 805         host->complete_what = COMPLETION_FINALIZE;
 806
 807 out:
 808         tasklet_schedule(&host->pio_tasklet);
 809         spin_unlock_irqrestore(&host->complete_lock, iflags);
 810         return;
 811
 812 fail_request:
 813         host->mrq->data->error = -EINVAL;
 814         host->complete_what = COMPLETION_FINALIZE;
 815         clear_imask(host);
 816
 817         goto out;
 818 }
 819
 820 static void finalize_request(struct s3cmci_host *host)
 821 {
 822         struct mmc_request *mrq = host->mrq;
 823         struct mmc_command *cmd = host->cmd_is_stop ? mrq->stop : mrq->cmd;
 824         int debug_as_failure = 0;
 825
 826         if (host->complete_what != COMPLETION_FINALIZE)
 827                 return;
 828
 829         if (!mrq)
 830                 return;
 831
 832         if (cmd->data && (cmd->error == 0) &&
 833             (cmd->data->error == 0)) {
 834                 if (s3cmci_host_usedma(host) && (!host->dma_complete)) {
 835                         dbg(host, dbg_dma, "DMA Missing (%d)!\n",
 836                             host->dma_complete);
 837                         return;
 838                 }
 839         }
 840
 841         /* Read response from controller. */
 842         cmd->resp[0] = readl(host->base + S3C2410_SDIRSP0);
 843         cmd->resp[1] = readl(host->base + S3C2410_SDIRSP1);
 844         cmd->resp[2] = readl(host->base + S3C2410_SDIRSP2);
 845         cmd->resp[3] = readl(host->base + S3C2410_SDIRSP3);
 846
 847         writel(host->prescaler, host->base + S3C2410_SDIPRE);
 848
 849         if (cmd->error)
 850                 debug_as_failure = 1;
 851
 852         if (cmd->data && cmd->data->error)
 853                 debug_as_failure = 1;
 854
 855         dbg_dumpcmd(host, cmd, debug_as_failure);
 856
 857         /* Cleanup controller */
 858         writel(0, host->base + S3C2410_SDICMDARG);
 859         writel(S3C2410_SDIDCON_STOP, host->base + S3C2410_SDIDCON);
 860         writel(0, host->base + S3C2410_SDICMDCON);
 861         clear_imask(host);
 862
 863         if (cmd->data && cmd->error)
 864                 cmd->data->error = cmd->error;
 865
 866         if (cmd->data && cmd->data->stop && (!host->cmd_is_stop)) {
 867                 host->cmd_is_stop = 1;
 868                 s3cmci_send_request(host->mmc);
 869                 return;
 870         }
 871
 872         /* If we have no data transfer we are finished here */
 873         if (!mrq->data)
 874                 goto request_done;
 875
 876         /* Calulate the amout of bytes transfer if there was no error */
 877         if (mrq->data->error == 0) {
 878                 mrq->data->bytes_xfered =
 879                         (mrq->data->blocks * mrq->data->blksz);
 880         } else {
 881                 mrq->data->bytes_xfered = 0;
 882         }
 883
 884         /* If we had an error while transfering data we flush the
 885          * DMA channel and the fifo to clear out any garbage. */
 886         if (mrq->data->error != 0) {
 887                 if (s3cmci_host_usedma(host))
 888                         s3c2410_dma_ctrl(host->dma, S3C2410_DMAOP_FLUSH);
 889
 890                 if (host->is2440) {
 891                         /* Clear failure register and reset fifo. */
 892                         writel(S3C2440_SDIFSTA_FIFORESET |
 893                                S3C2440_SDIFSTA_FIFOFAIL,
 894                                host->base + S3C2410_SDIFSTA);
 895                 } else {
 896                         u32 mci_con;
 897
 898                         /* reset fifo */
 899                         mci_con = readl(host->base + S3C2410_SDICON);
 900                         mci_con |= S3C2410_SDICON_FIFORESET;
 901
 902                         writel(mci_con, host->base + S3C2410_SDICON);
 903                 }
 904         }
 905
 906 request_done:
 907         host->complete_what = COMPLETION_NONE;
 908         host->mrq = NULL;
 909
 910         s3cmci_check_sdio_irq(host);
 911         mmc_request_done(host->mmc, mrq);
 912 }
 913
 914 static void s3cmci_dma_setup(struct s3cmci_host *host,
 915                              enum s3c2410_dmasrc source)
 916 {
 917         static enum s3c2410_dmasrc last_source = -1;
 918         static int setup_ok;
 919
 920         if (last_source == source)
 921                 return;
 922
 923         last_source = source;
 924
 925         s3c2410_dma_devconfig(host->dma, source,
 926                               host->mem->start + host->sdidata);
 927
 928         if (!setup_ok) {
 929                 s3c2410_dma_config(host->dma, 4);
 930                 s3c2410_dma_set_buffdone_fn(host->dma,
 931                                             s3cmci_dma_done_callback);
 932                 s3c2410_dma_setflags(host->dma, S3C2410_DMAF_AUTOSTART);
 933                 setup_ok = 1;
 934         }
 935 }
 936
 937 static void s3cmci_send_command(struct s3cmci_host *host,
 938                                         struct mmc_command *cmd)
 939 {
 940         u32 ccon, imsk;
 941
 942         imsk  = S3C2410_SDIIMSK_CRCSTATUS | S3C2410_SDIIMSK_CMDTIMEOUT |
 943                 S3C2410_SDIIMSK_RESPONSEND | S3C2410_SDIIMSK_CMDSENT |
 944                 S3C2410_SDIIMSK_RESPONSECRC;
 945
 946         enable_imask(host, imsk);
 947
 948         if (cmd->data)
 949                 host->complete_what = COMPLETION_XFERFINISH_RSPFIN;
 950         else if (cmd->flags & MMC_RSP_PRESENT)
 951                 host->complete_what = COMPLETION_RSPFIN;
 952         else
 953                 host->complete_what = COMPLETION_CMDSENT;
 954
 955         writel(cmd->arg, host->base + S3C2410_SDICMDARG);
 956
 957         ccon  = cmd->opcode & S3C2410_SDICMDCON_INDEX;
 958         ccon |= S3C2410_SDICMDCON_SENDERHOST | S3C2410_SDICMDCON_CMDSTART;
 959
 960         if (cmd->flags & MMC_RSP_PRESENT)
 961                 ccon |= S3C2410_SDICMDCON_WAITRSP;
 962
 963         if (cmd->flags & MMC_RSP_136)
 964                 ccon |= S3C2410_SDICMDCON_LONGRSP;
 965
 966         writel(ccon, host->base + S3C2410_SDICMDCON);
 967 }
 968
 969 static int s3cmci_setup_data(struct s3cmci_host *host, struct mmc_data *data)
 970 {
 971         u32 dcon, imsk, stoptries = 3;
 972
 973         /* write DCON register */
 974
 975         if (!data) {
 976                 writel(0, host->base + S3C2410_SDIDCON);
 977                 return 0;
 978         }
 979
 980         if ((data->blksz & 3) != 0) {
 981                 /* We cannot deal with unaligned blocks with more than
 982                  * one block being transfered. */
 983
 984                 if (data->blocks > 1) {
 985                         pr_warning("%s: can't do non-word sized block transfers (blksz %d)\n", __func__, data->blksz);
 986                         return -EINVAL;
 987                 }
 988         }
 989
 990         while (readl(host->base + S3C2410_SDIDSTA) &
 991                (S3C2410_SDIDSTA_TXDATAON | S3C2410_SDIDSTA_RXDATAON)) {
 992
 993                 dbg(host, dbg_err,
 994                     "mci_setup_data() transfer stillin progress.\n");
 995
 996                 writel(S3C2410_SDIDCON_STOP, host->base + S3C2410_SDIDCON);
 997                 s3cmci_reset(host);
 998
 999                 if ((stoptries--) == 0) {
1000                         dbg_dumpregs(host, "DRF");
1001                         return -EINVAL;
1002                 }
1003         }
1004
1005         dcon  = data->blocks & S3C2410_SDIDCON_BLKNUM_MASK;
1006
1007         if (s3cmci_host_usedma(host))
1008                 dcon |= S3C2410_SDIDCON_DMAEN;
1009
1010         if (host->bus_width == MMC_BUS_WIDTH_4)
1011                 dcon |= S3C2410_SDIDCON_WIDEBUS;
1012
1013         if (!(data->flags & MMC_DATA_STREAM))
1014                 dcon |= S3C2410_SDIDCON_BLOCKMODE;
1015
1016         if (data->flags & MMC_DATA_WRITE) {
1017                 dcon |= S3C2410_SDIDCON_TXAFTERRESP;
1018                 dcon |= S3C2410_SDIDCON_XFER_TXSTART;
1019         }
1020
1021         if (data->flags & MMC_DATA_READ) {
1022                 dcon |= S3C2410_SDIDCON_RXAFTERCMD;
1023                 dcon |= S3C2410_SDIDCON_XFER_RXSTART;
1024         }
1025
1026         if (host->is2440) {
1027                 dcon |= S3C2440_SDIDCON_DS_WORD;
1028                 dcon |= S3C2440_SDIDCON_DATSTART;
1029         }
1030
1031         writel(dcon, host->base + S3C2410_SDIDCON);
1032
1033         /* write BSIZE register */
1034
1035         writel(data->blksz, host->base + S3C2410_SDIBSIZE);
1036
1037         /* add to IMASK register */
1038         imsk = S3C2410_SDIIMSK_FIFOFAIL | S3C2410_SDIIMSK_DATACRC |
1039                S3C2410_SDIIMSK_DATATIMEOUT | S3C2410_SDIIMSK_DATAFINISH;
1040
1041         enable_imask(host, imsk);
1042
1043         /* write TIMER register */
1044
1045         if (host->is2440) {
1046                 writel(0x007FFFFF, host->base + S3C2410_SDITIMER);
1047         } else {
1048                 writel(0x0000FFFF, host->base + S3C2410_SDITIMER);
1049
1050                 /* FIX: set slow clock to prevent timeouts on read */
1051                 if (data->flags & MMC_DATA_READ)
1052                         writel(0xFF, host->base + S3C2410_SDIPRE);
1053         }
1054
1055         return 0;
1056 }
1057
1058 #define BOTH_DIR (MMC_DATA_WRITE | MMC_DATA_READ)
1059
1060 static int s3cmci_prepare_pio(struct s3cmci_host *host, struct mmc_data *data)
1061 {
1062         int rw = (data->flags & MMC_DATA_WRITE) ? 1 : 0;
1063
1064         BUG_ON((data->flags & BOTH_DIR) == BOTH_DIR);
1065
1066         host->pio_sgptr = 0;
1067         host->pio_bytes = 0;
1068         host->pio_count = 0;
1069         host->pio_active = rw ? XFER_WRITE : XFER_READ;
1070
1071         if (rw) {
1072                 do_pio_write(host);
1073                 enable_imask(host, S3C2410_SDIIMSK_TXFIFOHALF);
1074         } else {
1075                 enable_imask(host, S3C2410_SDIIMSK_RXFIFOHALF
1076                              | S3C2410_SDIIMSK_RXFIFOLAST);
1077         }
1078
1079         return 0;
1080 }
1081
1082 static int s3cmci_prepare_dma(struct s3cmci_host *host, struct mmc_data *data)
1083 {
1084         int dma_len, i;
1085         int rw = data->flags & MMC_DATA_WRITE;
1086
1087         BUG_ON((data->flags & BOTH_DIR) == BOTH_DIR);
1088
1089         s3cmci_dma_setup(host, rw ? S3C2410_DMASRC_MEM : S3C2410_DMASRC_HW);
1090         s3c2410_dma_ctrl(host->dma, S3C2410_DMAOP_FLUSH);
1091
1092         dma_len = dma_map_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
1093                              rw ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
1094
1095         if (dma_len == 0)
1096                 return -ENOMEM;
1097
1098         host->dma_complete = 0;
1099         host->dmatogo = dma_len;
1100
1101         for (i = 0; i < dma_len; i++) {
1102                 int res;
1103
1104                 dbg(host, dbg_dma, "enqueue %i: %08x@%u\n", i,
1105                     sg_dma_address(&data->sg[i]),
1106                     sg_dma_len(&data->sg[i]));
1107
1108                 res = s3c2410_dma_enqueue(host->dma, host,
1109                                           sg_dma_address(&data->sg[i]),
1110                                           sg_dma_len(&data->sg[i]));
1111
1112                 if (res) {
1113                         s3c2410_dma_ctrl(host->dma, S3C2410_DMAOP_FLUSH);
1114                         return -EBUSY;
1115                 }
1116         }
1117
1118         s3c2410_dma_ctrl(host->dma, S3C2410_DMAOP_START);
1119
1120         return 0;
1121 }
1122
1123 static void s3cmci_send_request(struct mmc_host *mmc)
1124 {
1125         struct s3cmci_host *host = mmc_priv(mmc);
1126         struct mmc_request *mrq = host->mrq;
1127         struct mmc_command *cmd = host->cmd_is_stop ? mrq->stop : mrq->cmd;
1128
1129         host->ccnt++;
1130         prepare_dbgmsg(host, cmd, host->cmd_is_stop);
1131
1132         /* Clear command, data and fifo status registers
1133            Fifo clear only necessary on 2440, but doesn't hurt on 2410
1134         */
1135         writel(0xFFFFFFFF, host->base + S3C2410_SDICMDSTAT);
1136         writel(0xFFFFFFFF, host->base + S3C2410_SDIDSTA);
1137         writel(0xFFFFFFFF, host->base + S3C2410_SDIFSTA);
1138
1139         if (cmd->data) {
1140                 int res = s3cmci_setup_data(host, cmd->data);
1141
1142                 host->dcnt++;
1143
1144                 if (res) {
1145                         dbg(host, dbg_err, "setup data error %d\n", res);
1146                         cmd->error = res;
1147                         cmd->data->error = res;
1148
1149                         mmc_request_done(mmc, mrq);
1150                         return;
1151                 }
1152
1153                 if (s3cmci_host_usedma(host))
1154                         res = s3cmci_prepare_dma(host, cmd->data);
1155                 else
1156                         res = s3cmci_prepare_pio(host, cmd->data);
1157
1158                 if (res) {
1159                         dbg(host, dbg_err, "data prepare error %d\n", res);
1160                         cmd->error = res;
1161                         cmd->data->error = res;
1162
1163                         mmc_request_done(mmc, mrq);
1164                         return;
1165                 }
1166         }
1167
1168         /* Send command */
1169         s3cmci_send_command(host, cmd);
1170
1171         /* Enable Interrupt */
1172         s3cmci_enable_irq(host, true);
1173 }
1174
1175 static int s3cmci_card_present(struct mmc_host *mmc)
1176 {
1177         struct s3cmci_host *host = mmc_priv(mmc);
1178         struct s3c24xx_mci_pdata *pdata = host->pdata;
1179         int ret;
1180
1181         if (pdata->gpio_detect == 0)
1182                 return -ENOSYS;
1183
1184         ret = gpio_get_value(pdata->gpio_detect) ? 0 : 1;
1185         return ret ^ pdata->detect_invert;
1186 }
1187
1188 static void s3cmci_request(struct mmc_host *mmc, struct mmc_request *mrq)
1189 {
1190         struct s3cmci_host *host = mmc_priv(mmc);
1191
1192         host->status = "mmc request";
1193         host->cmd_is_stop = 0;
1194         host->mrq = mrq;
1195
1196         if (s3cmci_card_present(mmc) == 0) {
1197                 dbg(host, dbg_err, "%s: no medium present\n", __func__);
1198                 host->mrq->cmd->error = -ENOMEDIUM;
1199                 mmc_request_done(mmc, mrq);
1200         } else
1201                 s3cmci_send_request(mmc);
1202 }
1203
1204 static void s3cmci_set_clk(struct s3cmci_host *host, struct mmc_ios *ios)
1205 {
1206         u32 mci_psc;
1207
1208         /* Set clock */
1209         for (mci_psc = 0; mci_psc < 255; mci_psc++) {
1210                 host->real_rate = host->clk_rate / (host->clk_div*(mci_psc+1));
1211
1212                 if (host->real_rate <= ios->clock)
1213                         break;
1214         }
1215
1216         if (mci_psc > 255)
1217                 mci_psc = 255;
1218
1219         host->prescaler = mci_psc;
1220         writel(host->prescaler, host->base + S3C2410_SDIPRE);
1221
1222         /* If requested clock is 0, real_rate will be 0, too */
1223         if (ios->clock == 0)
1224                 host->real_rate = 0;
1225 }
1226
1227 static void s3cmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1228 {
1229         struct s3cmci_host *host = mmc_priv(mmc);
1230         u32 mci_con;
1231
1232         /* Set the power state */
1233
1234         mci_con = readl(host->base + S3C2410_SDICON);
1235
1236         switch (ios->power_mode) {
1237         case MMC_POWER_ON:
1238         case MMC_POWER_UP:
1239                 s3c2410_gpio_cfgpin(S3C2410_GPE(5), S3C2410_GPE5_SDCLK);
1240                 s3c2410_gpio_cfgpin(S3C2410_GPE(6), S3C2410_GPE6_SDCMD);
1241                 s3c2410_gpio_cfgpin(S3C2410_GPE(7), S3C2410_GPE7_SDDAT0);
1242                 s3c2410_gpio_cfgpin(S3C2410_GPE(8), S3C2410_GPE8_SDDAT1);
1243                 s3c2410_gpio_cfgpin(S3C2410_GPE(9), S3C2410_GPE9_SDDAT2);
1244                 s3c2410_gpio_cfgpin(S3C2410_GPE(10), S3C2410_GPE10_SDDAT3);
1245
1246                 if (host->pdata->set_power)
1247                         host->pdata->set_power(ios->power_mode, ios->vdd);
1248
1249                 if (!host->is2440)
1250                         mci_con |= S3C2410_SDICON_FIFORESET;
1251
1252                 break;
1253
1254         case MMC_POWER_OFF:
1255         default:
1256                 gpio_direction_output(S3C2410_GPE(5), 0);
1257
1258                 if (host->is2440)
1259                         mci_con |= S3C2440_SDICON_SDRESET;
1260
1261                 if (host->pdata->set_power)
1262                         host->pdata->set_power(ios->power_mode, ios->vdd);
1263
1264                 break;
1265         }
1266
1267         s3cmci_set_clk(host, ios);
1268
1269         /* Set CLOCK_ENABLE */
1270         if (ios->clock)
1271                 mci_con |= S3C2410_SDICON_CLOCKTYPE;
1272         else
1273                 mci_con &= ~S3C2410_SDICON_CLOCKTYPE;
1274
1275         writel(mci_con, host->base + S3C2410_SDICON);
1276
1277         if ((ios->power_mode == MMC_POWER_ON) ||
1278             (ios->power_mode == MMC_POWER_UP)) {
1279                 dbg(host, dbg_conf, "running at %lukHz (requested: %ukHz).\n",
1280                         host->real_rate/1000, ios->clock/1000);
1281         } else {
1282                 dbg(host, dbg_conf, "powered down.\n");
1283         }
1284
1285         host->bus_width = ios->bus_width;
1286 }
1287
1288 static void s3cmci_reset(struct s3cmci_host *host)
1289 {
1290         u32 con = readl(host->base + S3C2410_SDICON);
1291
1292         con |= S3C2440_SDICON_SDRESET;
1293         writel(con, host->base + S3C2410_SDICON);
1294 }
1295
1296 static int s3cmci_get_ro(struct mmc_host *mmc)
1297 {
1298         struct s3cmci_host *host = mmc_priv(mmc);
1299         struct s3c24xx_mci_pdata *pdata = host->pdata;
1300         int ret;
1301
1302         if (pdata->no_wprotect)
1303                 return 0;
1304
1305         ret = s3c2410_gpio_getpin(pdata->gpio_wprotect);
1306
1307         if (pdata->wprotect_invert)
1308                 ret = !ret;
1309
1310         return ret;
1311 }
1312
1313 static void s3cmci_enable_sdio_irq(struct mmc_host *mmc, int enable)
1314 {
1315         struct s3cmci_host *host = mmc_priv(mmc);
1316         unsigned long flags;
1317         u32 con;
1318
1319         local_irq_save(flags);
1320
1321         con = readl(host->base + S3C2410_SDICON);
1322         host->sdio_irqen = enable;
1323
1324         if (enable == host->sdio_irqen)
1325                 goto same_state;
1326
1327         if (enable) {
1328                 con |= S3C2410_SDICON_SDIOIRQ;
1329                 enable_imask(host, S3C2410_SDIIMSK_SDIOIRQ);
1330
1331                 if (!host->irq_state && !host->irq_disabled) {
1332                         host->irq_state = true;
1333                         enable_irq(host->irq);
1334                 }
1335         } else {
1336                 disable_imask(host, S3C2410_SDIIMSK_SDIOIRQ);
1337                 con &= ~S3C2410_SDICON_SDIOIRQ;
1338
1339                 if (!host->irq_enabled && host->irq_state) {
1340                         disable_irq_nosync(host->irq);
1341                         host->irq_state = false;
1342                 }
1343         }
1344
1345         writel(con, host->base + S3C2410_SDICON);
1346
1347  same_state:
1348         local_irq_restore(flags);
1349
1350         s3cmci_check_sdio_irq(host);
1351 }
1352
1353 static struct mmc_host_ops s3cmci_ops = {
1354         .request        = s3cmci_request,
1355         .set_ios        = s3cmci_set_ios,
1356         .get_ro         = s3cmci_get_ro,
1357         .get_cd         = s3cmci_card_present,
1358         .enable_sdio_irq = s3cmci_enable_sdio_irq,
1359 };
1360
1361 static struct s3c24xx_mci_pdata s3cmci_def_pdata = {
1362         /* This is currently here to avoid a number of if (host->pdata)
1363          * checks. Any zero fields to ensure reasonable defaults are picked. */
1364 };
1365
1366 #ifdef CONFIG_CPU_FREQ
1367
1368 static int s3cmci_cpufreq_transition(struct notifier_block *nb,
1369                                      unsigned long val, void *data)
1370 {
1371         struct s3cmci_host *host;
1372         struct mmc_host *mmc;
1373         unsigned long newclk;
1374         unsigned long flags;
1375
1376         host = container_of(nb, struct s3cmci_host, freq_transition);
1377         newclk = clk_get_rate(host->clk);
1378         mmc = host->mmc;
1379
1380         if ((val == CPUFREQ_PRECHANGE && newclk > host->clk_rate) ||
1381             (val == CPUFREQ_POSTCHANGE && newclk < host->clk_rate)) {
1382                 spin_lock_irqsave(&mmc->lock, flags);
1383
1384                 host->clk_rate = newclk;
1385
1386                 if (mmc->ios.power_mode != MMC_POWER_OFF &&
1387                     mmc->ios.clock != 0)
1388                         s3cmci_set_clk(host, &mmc->ios);
1389
1390                 spin_unlock_irqrestore(&mmc->lock, flags);
1391         }
1392
1393         return 0;
1394 }
1395
1396 static inline int s3cmci_cpufreq_register(struct s3cmci_host *host)
1397 {
1398         host->freq_transition.notifier_call = s3cmci_cpufreq_transition;
1399
1400         return cpufreq_register_notifier(&host->freq_transition,
1401                                          CPUFREQ_TRANSITION_NOTIFIER);
1402 }
1403
1404 static inline void s3cmci_cpufreq_deregister(struct s3cmci_host *host)
1405 {
1406         cpufreq_unregister_notifier(&host->freq_transition,
1407                                     CPUFREQ_TRANSITION_NOTIFIER);
1408 }
1409
1410 #else
1411 static inline int s3cmci_cpufreq_register(struct s3cmci_host *host)
1412 {
1413         return 0;
1414 }
1415
1416 static inline void s3cmci_cpufreq_deregister(struct s3cmci_host *host)
1417 {
1418 }
1419 #endif
1420
1421
1422 #ifdef CONFIG_DEBUG_FS
1423
1424 static int s3cmci_state_show(struct seq_file *seq, void *v)
1425 {
1426         struct s3cmci_host *host = seq->private;
1427
1428         seq_printf(seq, "Register base = 0x%08x\n", (u32)host->base);
1429         seq_printf(seq, "Clock rate = %ld\n", host->clk_rate);
1430         seq_printf(seq, "Prescale = %d\n", host->prescaler);
1431         seq_printf(seq, "is2440 = %d\n", host->is2440);
1432         seq_printf(seq, "IRQ = %d\n", host->irq);
1433         seq_printf(seq, "IRQ enabled = %d\n", host->irq_enabled);
1434         seq_printf(seq, "IRQ disabled = %d\n", host->irq_disabled);
1435         seq_printf(seq, "IRQ state = %d\n", host->irq_state);
1436         seq_printf(seq, "CD IRQ = %d\n", host->irq_cd);
1437         seq_printf(seq, "Do DMA = %d\n", s3cmci_host_usedma(host));
1438         seq_printf(seq, "SDIIMSK at %d\n", host->sdiimsk);
1439         seq_printf(seq, "SDIDATA at %d\n", host->sdidata);
1440
1441         return 0;
1442 }
1443
1444 static int s3cmci_state_open(struct inode *inode, struct file *file)
1445 {
1446         return single_open(file, s3cmci_state_show, inode->i_private);
1447 }
1448
1449 static const struct file_operations s3cmci_fops_state = {
1450         .owner          = THIS_MODULE,
1451         .open           = s3cmci_state_open,
1452         .read           = seq_read,
1453         .llseek         = seq_lseek,
1454         .release        = single_release,
1455 };
1456
1457 #define DBG_REG(_r) { .addr = S3C2410_SDI##_r, .name = #_r }
1458
1459 struct s3cmci_reg {
1460         unsigned short  addr;
1461         unsigned char   *name;
1462 } debug_regs[] = {
1463         DBG_REG(CON),
1464         DBG_REG(PRE),
1465         DBG_REG(CMDARG),
1466         DBG_REG(CMDCON),
1467         DBG_REG(CMDSTAT),
1468         DBG_REG(RSP0),
1469         DBG_REG(RSP1),
1470         DBG_REG(RSP2),
1471         DBG_REG(RSP3),
1472         DBG_REG(TIMER),
1473         DBG_REG(BSIZE),
1474         DBG_REG(DCON),
1475         DBG_REG(DCNT),
1476         DBG_REG(DSTA),
1477         DBG_REG(FSTA),
1478         {}
1479 };
1480
1481 static int s3cmci_regs_show(struct seq_file *seq, void *v)
1482 {
1483         struct s3cmci_host *host = seq->private;
1484         struct s3cmci_reg *rptr = debug_regs;
1485
1486         for (; rptr->name; rptr++)
1487                 seq_printf(seq, "SDI%s\t=0x%08x\n", rptr->name,
1488                            readl(host->base + rptr->addr));
1489
1490         seq_printf(seq, "SDIIMSK\t=0x%08x\n", readl(host->base + host->sdiimsk));
1491
1492         return 0;
1493 }
1494
1495 static int s3cmci_regs_open(struct inode *inode, struct file *file)
1496 {
1497         return single_open(file, s3cmci_regs_show, inode->i_private);
1498 }
1499
1500 static const struct file_operations s3cmci_fops_regs = {
1501         .owner          = THIS_MODULE,
1502         .open           = s3cmci_regs_open,
1503         .read           = seq_read,
1504         .llseek         = seq_lseek,
1505         .release        = single_release,
1506 };
1507
1508 static void s3cmci_debugfs_attach(struct s3cmci_host *host)
1509 {
1510         struct device *dev = &host->pdev->dev;
1511
1512         host->debug_root = debugfs_create_dir(dev_name(dev), NULL);
1513         if (IS_ERR(host->debug_root)) {
1514                 dev_err(dev, "failed to create debugfs root\n");
1515                 return;
1516         }
1517
1518         host->debug_state = debugfs_create_file("state", 0444,
1519                                                 host->debug_root, host,
1520                                                 &s3cmci_fops_state);
1521
1522         if (IS_ERR(host->debug_state))
1523                 dev_err(dev, "failed to create debug state file\n");
1524
1525         host->debug_regs = debugfs_create_file("regs", 0444,
1526                                                host->debug_root, host,
1527                                                &s3cmci_fops_regs);
1528
1529         if (IS_ERR(host->debug_regs))
1530                 dev_err(dev, "failed to create debug regs file\n");
1531 }
1532
1533 static void s3cmci_debugfs_remove(struct s3cmci_host *host)
1534 {
1535         debugfs_remove(host->debug_regs);
1536         debugfs_remove(host->debug_state);
1537         debugfs_remove(host->debug_root);
1538 }
1539
1540 #else
1541 static inline void s3cmci_debugfs_attach(struct s3cmci_host *host) { }
1542 static inline void s3cmci_debugfs_remove(struct s3cmci_host *host) { }
1543
1544 #endif /* CONFIG_DEBUG_FS */
1545
1546 static int __devinit s3cmci_probe(struct platform_device *pdev)
1547 {
1548         struct s3cmci_host *host;
1549         struct mmc_host *mmc;
1550         int ret;
1551         int is2440;
1552         int i;
1553
1554         is2440 = platform_get_device_id(pdev)->driver_data;
1555
1556         mmc = mmc_alloc_host(sizeof(struct s3cmci_host), &pdev->dev);
1557         if (!mmc) {
1558                 ret = -ENOMEM;
1559                 goto probe_out;
1560         }
1561
1562         for (i = S3C2410_GPE(5); i <= S3C2410_GPE(10); i++) {
1563                 ret = gpio_request(i, dev_name(&pdev->dev));
1564                 if (ret) {
1565                         dev_err(&pdev->dev, "failed to get gpio %d\n", i);
1566
1567                         for (i--; i >= S3C2410_GPE(5); i--)
1568                                 gpio_free(i);
1569
1570                         goto probe_free_host;
1571                 }
1572         }
1573
1574         host = mmc_priv(mmc);
1575         host->mmc       = mmc;
1576         host->pdev      = pdev;
1577         host->is2440    = is2440;
1578
1579         host->pdata = pdev->dev.platform_data;
1580         if (!host->pdata) {
1581                 pdev->dev.platform_data = &s3cmci_def_pdata;
1582                 host->pdata = &s3cmci_def_pdata;
1583         }
1584
1585         spin_lock_init(&host->complete_lock);
1586         tasklet_init(&host->pio_tasklet, pio_tasklet, (unsigned long) host);
1587
1588         if (is2440) {
1589                 host->sdiimsk   = S3C2440_SDIIMSK;
1590                 host->sdidata   = S3C2440_SDIDATA;
1591                 host->clk_div   = 1;
1592         } else {
1593                 host->sdiimsk   = S3C2410_SDIIMSK;
1594                 host->sdidata   = S3C2410_SDIDATA;
1595                 host->clk_div   = 2;
1596         }
1597
1598         host->complete_what     = COMPLETION_NONE;
1599         host->pio_active        = XFER_NONE;
1600
1601 #ifdef CONFIG_MMC_S3C_PIODMA
1602         host->dodma             = host->pdata->dma;
1603 #endif
1604
1605         host->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1606         if (!host->mem) {
1607                 dev_err(&pdev->dev,
1608                         "failed to get io memory region resouce.\n");
1609
1610                 ret = -ENOENT;
1611                 goto probe_free_gpio;
1612         }
1613
1614         host->mem = request_mem_region(host->mem->start,
1615                                        resource_size(host->mem), pdev->name);
1616
1617         if (!host->mem) {
1618                 dev_err(&pdev->dev, "failed to request io memory region.\n");
1619                 ret = -ENOENT;
1620                 goto probe_free_gpio;
1621         }
1622
1623         host->base = ioremap(host->mem->start, resource_size(host->mem));
1624         if (!host->base) {
1625                 dev_err(&pdev->dev, "failed to ioremap() io memory region.\n");
1626                 ret = -EINVAL;
1627                 goto probe_free_mem_region;
1628         }
1629
1630         host->irq = platform_get_irq(pdev, 0);
1631         if (host->irq == 0) {
1632                 dev_err(&pdev->dev, "failed to get interrupt resouce.\n");
1633                 ret = -EINVAL;
1634                 goto probe_iounmap;
1635         }
1636
1637         if (request_irq(host->irq, s3cmci_irq, 0, DRIVER_NAME, host)) {
1638                 dev_err(&pdev->dev, "failed to request mci interrupt.\n");
1639                 ret = -ENOENT;
1640                 goto probe_iounmap;
1641         }
1642
1643         /* We get spurious interrupts even when we have set the IMSK
1644          * register to ignore everything, so use disable_irq() to make
1645          * ensure we don't lock the system with un-serviceable requests. */
1646
1647         disable_irq(host->irq);
1648         host->irq_state = false;
1649
1650         if (!host->pdata->no_detect) {
1651                 ret = gpio_request(host->pdata->gpio_detect, "s3cmci detect");
1652                 if (ret) {
1653                         dev_err(&pdev->dev, "failed to get detect gpio\n");
1654                         goto probe_free_irq;
1655                 }
1656
1657                 host->irq_cd = s3c2410_gpio_getirq(host->pdata->gpio_detect);
1658
1659                 if (host->irq_cd >= 0) {
1660                         if (request_irq(host->irq_cd, s3cmci_irq_cd,
1661                                         IRQF_TRIGGER_RISING |
1662                                         IRQF_TRIGGER_FALLING,
1663                                         DRIVER_NAME, host)) {
1664                                 dev_err(&pdev->dev,
1665                                         "can't get card detect irq.\n");
1666                                 ret = -ENOENT;
1667                                 goto probe_free_gpio_cd;
1668                         }
1669                 } else {
1670                         dev_warn(&pdev->dev,
1671                                  "host detect has no irq available\n");
1672                         gpio_direction_input(host->pdata->gpio_detect);
1673                 }
1674         } else
1675                 host->irq_cd = -1;
1676
1677         if (!host->pdata->no_wprotect) {
1678                 ret = gpio_request(host->pdata->gpio_wprotect, "s3cmci wp");
1679                 if (ret) {
1680                         dev_err(&pdev->dev, "failed to get writeprotect\n");
1681                         goto probe_free_irq_cd;
1682                 }
1683
1684                 gpio_direction_input(host->pdata->gpio_wprotect);
1685         }
1686
1687         /* depending on the dma state, get a dma channel to use. */
1688
1689         if (s3cmci_host_usedma(host)) {
1690                 host->dma = s3c2410_dma_request(DMACH_SDI, &s3cmci_dma_client,
1691                                                 host);
1692                 if (host->dma < 0) {
1693                         dev_err(&pdev->dev, "cannot get DMA channel.\n");
1694                         if (!s3cmci_host_canpio()) {
1695                                 ret = -EBUSY;
1696                                 goto probe_free_gpio_wp;
1697                         } else {
1698                                 dev_warn(&pdev->dev, "falling back to PIO.\n");
1699                                 host->dodma = 0;
1700                         }
1701                 }
1702         }
1703
1704         host->clk = clk_get(&pdev->dev, "sdi");
1705         if (IS_ERR(host->clk)) {
1706                 dev_err(&pdev->dev, "failed to find clock source.\n");
1707                 ret = PTR_ERR(host->clk);
1708                 host->clk = NULL;
1709                 goto probe_free_dma;
1710         }
1711
1712         ret = clk_enable(host->clk);
1713         if (ret) {
1714                 dev_err(&pdev->dev, "failed to enable clock source.\n");
1715                 goto clk_free;
1716         }
1717
1718         host->clk_rate = clk_get_rate(host->clk);
1719
1720         mmc->ops        = &s3cmci_ops;
1721         mmc->ocr_avail  = MMC_VDD_32_33 | MMC_VDD_33_34;
1722 #ifdef CONFIG_MMC_S3C_HW_SDIO_IRQ
1723         mmc->caps       = MMC_CAP_4_BIT_DATA | MMC_CAP_SDIO_IRQ;
1724 #else
1725         mmc->caps       = MMC_CAP_4_BIT_DATA;
1726 #endif
1727         mmc->f_min      = host->clk_rate / (host->clk_div * 256);
1728         mmc->f_max      = host->clk_rate / host->clk_div;
1729
1730         if (host->pdata->ocr_avail)
1731                 mmc->ocr_avail = host->pdata->ocr_avail;
1732
1733         mmc->max_blk_count      = 4095;
1734         mmc->max_blk_size       = 4095;
1735         mmc->max_req_size       = 4095 * 512;
1736         mmc->max_seg_size       = mmc->max_req_size;
1737
1738         mmc->max_phys_segs      = 128;
1739         mmc->max_hw_segs        = 128;
1740
1741         dbg(host, dbg_debug,
1742             "probe: mode:%s mapped mci_base:%p irq:%u irq_cd:%u dma:%u.\n",
1743             (host->is2440?"2440":""),
1744             host->base, host->irq, host->irq_cd, host->dma);
1745
1746         ret = s3cmci_cpufreq_register(host);
1747         if (ret) {
1748                 dev_err(&pdev->dev, "failed to register cpufreq\n");
1749                 goto free_dmabuf;
1750         }
1751
1752         ret = mmc_add_host(mmc);
1753         if (ret) {
1754                 dev_err(&pdev->dev, "failed to add mmc host.\n");
1755                 goto free_cpufreq;
1756         }
1757
1758         s3cmci_debugfs_attach(host);
1759
1760         platform_set_drvdata(pdev, mmc);
1761         dev_info(&pdev->dev, "%s - using %s, %s SDIO IRQ\n", mmc_hostname(mmc),
1762                  s3cmci_host_usedma(host) ? "dma" : "pio",
1763                  mmc->caps & MMC_CAP_SDIO_IRQ ? "hw" : "sw");
1764
1765         return 0;
1766
1767  free_cpufreq:
1768         s3cmci_cpufreq_deregister(host);
1769
1770  free_dmabuf:
1771         clk_disable(host->clk);
1772
1773  clk_free:
1774         clk_put(host->clk);
1775
1776  probe_free_dma:
1777         if (s3cmci_host_usedma(host))
1778                 s3c2410_dma_free(host->dma, &s3cmci_dma_client);
1779
1780  probe_free_gpio_wp:
1781         if (!host->pdata->no_wprotect)
1782                 gpio_free(host->pdata->gpio_wprotect);
1783
1784  probe_free_gpio_cd:
1785         if (!host->pdata->no_detect)
1786                 gpio_free(host->pdata->gpio_detect);
1787
1788  probe_free_irq_cd:
1789         if (host->irq_cd >= 0)
1790                 free_irq(host->irq_cd, host);
1791
1792  probe_free_irq:
1793         free_irq(host->irq, host);
1794
1795  probe_iounmap:
1796         iounmap(host->base);
1797
1798  probe_free_mem_region:
1799         release_mem_region(host->mem->start, resource_size(host->mem));
1800
1801  probe_free_gpio:
1802         for (i = S3C2410_GPE(5); i <= S3C2410_GPE(10); i++)
1803                 gpio_free(i);
1804
1805  probe_free_host:
1806         mmc_free_host(mmc);
1807
1808  probe_out:
1809         return ret;
1810 }
1811
1812 static void s3cmci_shutdown(struct platform_device *pdev)
1813 {
1814         struct mmc_host *mmc = platform_get_drvdata(pdev);
1815         struct s3cmci_host *host = mmc_priv(mmc);
1816
1817         if (host->irq_cd >= 0)
1818                 free_irq(host->irq_cd, host);
1819
1820         s3cmci_debugfs_remove(host);
1821         s3cmci_cpufreq_deregister(host);
1822         mmc_remove_host(mmc);
1823         clk_disable(host->clk);
1824 }
1825
1826 static int __devexit s3cmci_remove(struct platform_device *pdev)
1827 {
1828         struct mmc_host         *mmc  = platform_get_drvdata(pdev);
1829         struct s3cmci_host      *host = mmc_priv(mmc);
1830         struct s3c24xx_mci_pdata *pd = host->pdata;
1831         int i;
1832
1833         s3cmci_shutdown(pdev);
1834
1835         clk_put(host->clk);
1836
1837         tasklet_disable(&host->pio_tasklet);
1838
1839         if (s3cmci_host_usedma(host))
1840                 s3c2410_dma_free(host->dma, &s3cmci_dma_client);
1841
1842         free_irq(host->irq, host);
1843
1844         if (!pd->no_wprotect)
1845                 gpio_free(pd->gpio_wprotect);
1846
1847         if (!pd->no_detect)
1848                 gpio_free(pd->gpio_detect);
1849
1850         for (i = S3C2410_GPE(5); i <= S3C2410_GPE(10); i++)
1851                 gpio_free(i);
1852
1853
1854         iounmap(host->base);
1855         release_mem_region(host->mem->start, resource_size(host->mem));
1856
1857         mmc_free_host(mmc);
1858         return 0;
1859 }
1860
1861 static struct platform_device_id s3cmci_driver_ids[] = {
1862         {
1863                 .name   = "s3c2410-sdi",
1864                 .driver_data    = 0,
1865         }, {
1866                 .name   = "s3c2412-sdi",
1867                 .driver_data    = 1,
1868         }, {
1869                 .name   = "s3c2440-sdi",
1870                 .driver_data    = 1,
1871         },
1872         { }
1873 };
1874
1875 MODULE_DEVICE_TABLE(platform, s3cmci_driver_ids);
1876
1877
1878 #ifdef CONFIG_PM
1879
1880 static int s3cmci_suspend(struct device *dev)
1881 {
1882         struct mmc_host *mmc = platform_get_drvdata(to_platform_device(dev));
1883         struct pm_message event = { PM_EVENT_SUSPEND };
1884
1885         return mmc_suspend_host(mmc, event);
1886 }
1887
1888 static int s3cmci_resume(struct device *dev)
1889 {
1890         struct mmc_host *mmc = platform_get_drvdata(to_platform_device(dev));
1891
1892         return mmc_resume_host(mmc);
1893 }
1894
1895 static struct dev_pm_ops s3cmci_pm = {
1896         .suspend        = s3cmci_suspend,
1897         .resume         = s3cmci_resume,
1898 };
1899
1900 #define s3cmci_pm_ops &s3cmci_pm
1901 #else /* CONFIG_PM */
1902 #define s3cmci_pm_ops NULL
1903 #endif /* CONFIG_PM */
1904
1905
1906 static struct platform_driver s3cmci_driver = {
1907         .driver = {
1908                 .name   = "s3c-sdi",
1909                 .owner  = THIS_MODULE,
1910                 .pm     = s3cmci_pm_ops,
1911         },
1912         .id_table       = s3cmci_driver_ids,
1913         .probe          = s3cmci_probe,
1914         .remove         = __devexit_p(s3cmci_remove),
1915         .shutdown       = s3cmci_shutdown,
1916 };
1917
1918 static int __init s3cmci_init(void)
1919 {
1920         return platform_driver_register(&s3cmci_driver);
1921 }
1922
1923 static void __exit s3cmci_exit(void)
1924 {
1925         platform_driver_unregister(&s3cmci_driver);
1926 }
1927
1928 module_init(s3cmci_init);
1929 module_exit(s3cmci_exit);
1930
1931 MODULE_DESCRIPTION("Samsung S3C MMC/SD Card Interface driver");
1932 MODULE_LICENSE("GPL v2");
1933 MODULE_AUTHOR("Thomas Kleffel <tk@maintech.de>, Ben Dooks <ben-linux@fluff.org>");