git.oblomov.eu Git - linux-2.6/blob - 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  * 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/irq.h>
  21 #include <linux/io.h>
  22
  23 #include <asm/dma.h>
  24
  25 #include <mach/regs-sdi.h>
  26 #include <mach/regs-gpio.h>
  27
  28 #include <plat/mci.h>
  29
  30 #include "s3cmci.h"
  31
  32 #define DRIVER_NAME "s3c-mci"
  33
  34 enum dbg_channels {
  35         dbg_err   = (1 << 0),
  36         dbg_debug = (1 << 1),
  37         dbg_info  = (1 << 2),
  38         dbg_irq   = (1 << 3),
  39         dbg_sg    = (1 << 4),
  40         dbg_dma   = (1 << 5),
  41         dbg_pio   = (1 << 6),
  42         dbg_fail  = (1 << 7),
  43         dbg_conf  = (1 << 8),
  44 };
  45
  46 static const int dbgmap_err   = dbg_fail;
  47 static const int dbgmap_info  = dbg_info | dbg_conf;
  48 static const int dbgmap_debug = dbg_err | dbg_debug;
  49
  50 #define dbg(host, channels, args...)              \
  51         do {                                      \
  52         if (dbgmap_err & channels)                \
  53                 dev_err(&host->pdev->dev, args);  \
  54         else if (dbgmap_info & channels)          \
  55                 dev_info(&host->pdev->dev, args); \
  56         else if (dbgmap_debug & channels)         \
  57                 dev_dbg(&host->pdev->dev, args);  \
  58         } while (0)
  59
  60 #define RESSIZE(ressource) (((ressource)->end - (ressource)->start)+1)
  61
  62 static struct s3c2410_dma_client s3cmci_dma_client = {
  63         .name           = "s3c-mci",
  64 };
  65
  66 static void finalize_request(struct s3cmci_host *host);
  67 static void s3cmci_send_request(struct mmc_host *mmc);
  68 static void s3cmci_reset(struct s3cmci_host *host);
  69
  70 #ifdef CONFIG_MMC_DEBUG
  71
  72 static void dbg_dumpregs(struct s3cmci_host *host, char *prefix)
  73 {
  74         u32 con, pre, cmdarg, cmdcon, cmdsta, r0, r1, r2, r3, timer, bsize;
  75         u32 datcon, datcnt, datsta, fsta, imask;
  76
  77         con     = readl(host->base + S3C2410_SDICON);
  78         pre     = readl(host->base + S3C2410_SDIPRE);
  79         cmdarg  = readl(host->base + S3C2410_SDICMDARG);
  80         cmdcon  = readl(host->base + S3C2410_SDICMDCON);
  81         cmdsta  = readl(host->base + S3C2410_SDICMDSTAT);
  82         r0      = readl(host->base + S3C2410_SDIRSP0);
  83         r1      = readl(host->base + S3C2410_SDIRSP1);
  84         r2      = readl(host->base + S3C2410_SDIRSP2);
  85         r3      = readl(host->base + S3C2410_SDIRSP3);
  86         timer   = readl(host->base + S3C2410_SDITIMER);
  87         bsize   = readl(host->base + S3C2410_SDIBSIZE);
  88         datcon  = readl(host->base + S3C2410_SDIDCON);
  89         datcnt  = readl(host->base + S3C2410_SDIDCNT);
  90         datsta  = readl(host->base + S3C2410_SDIDSTA);
  91         fsta    = readl(host->base + S3C2410_SDIFSTA);
  92         imask   = readl(host->base + host->sdiimsk);
  93
  94         dbg(host, dbg_debug, "%s  CON:[%08x]  PRE:[%08x]  TMR:[%08x]\n",
  95                                 prefix, con, pre, timer);
  96
  97         dbg(host, dbg_debug, "%s CCON:[%08x] CARG:[%08x] CSTA:[%08x]\n",
  98                                 prefix, cmdcon, cmdarg, cmdsta);
  99
 100         dbg(host, dbg_debug, "%s DCON:[%08x] FSTA:[%08x]"
 101                                " DSTA:[%08x] DCNT:[%08x]\n",
 102                                 prefix, datcon, fsta, datsta, datcnt);
 103
 104         dbg(host, dbg_debug, "%s   R0:[%08x]   R1:[%08x]"
 105                                "   R2:[%08x]   R3:[%08x]\n",
 106                                 prefix, r0, r1, r2, r3);
 107 }
 108
 109 static void prepare_dbgmsg(struct s3cmci_host *host, struct mmc_command *cmd,
 110                            int stop)
 111 {
 112         snprintf(host->dbgmsg_cmd, 300,
 113                  "#%u%s op:%i arg:0x%08x flags:0x08%x retries:%u",
 114                  host->ccnt, (stop ? " (STOP)" : ""),
 115                  cmd->opcode, cmd->arg, cmd->flags, cmd->retries);
 116
 117         if (cmd->data) {
 118                 snprintf(host->dbgmsg_dat, 300,
 119                          "#%u bsize:%u blocks:%u bytes:%u",
 120                          host->dcnt, cmd->data->blksz,
 121                          cmd->data->blocks,
 122                          cmd->data->blocks * cmd->data->blksz);
 123         } else {
 124                 host->dbgmsg_dat[0] = '\0';
 125         }
 126 }
 127
 128 static void dbg_dumpcmd(struct s3cmci_host *host, struct mmc_command *cmd,
 129                         int fail)
 130 {
 131         unsigned int dbglvl = fail ? dbg_fail : dbg_debug;
 132
 133         if (!cmd)
 134                 return;
 135
 136         if (cmd->error == 0) {
 137                 dbg(host, dbglvl, "CMD[OK] %s R0:0x%08x\n",
 138                         host->dbgmsg_cmd, cmd->resp[0]);
 139         } else {
 140                 dbg(host, dbglvl, "CMD[ERR %i] %s Status:%s\n",
 141                         cmd->error, host->dbgmsg_cmd, host->status);
 142         }
 143
 144         if (!cmd->data)
 145                 return;
 146
 147         if (cmd->data->error == 0) {
 148                 dbg(host, dbglvl, "DAT[OK] %s\n", host->dbgmsg_dat);
 149         } else {
 150                 dbg(host, dbglvl, "DAT[ERR %i] %s DCNT:0x%08x\n",
 151                         cmd->data->error, host->dbgmsg_dat,
 152                         readl(host->base + S3C2410_SDIDCNT));
 153         }
 154 }
 155 #else
 156 static void dbg_dumpcmd(struct s3cmci_host *host,
 157                         struct mmc_command *cmd, int fail) { }
 158
 159 static void prepare_dbgmsg(struct s3cmci_host *host, struct mmc_command *cmd,
 160                            int stop) { }
 161
 162 static void dbg_dumpregs(struct s3cmci_host *host, char *prefix) { }
 163
 164 #endif /* CONFIG_MMC_DEBUG */
 165
 166 static inline u32 enable_imask(struct s3cmci_host *host, u32 imask)
 167 {
 168         u32 newmask;
 169
 170         newmask = readl(host->base + host->sdiimsk);
 171         newmask |= imask;
 172
 173         writel(newmask, host->base + host->sdiimsk);
 174
 175         return newmask;
 176 }
 177
 178 static inline u32 disable_imask(struct s3cmci_host *host, u32 imask)
 179 {
 180         u32 newmask;
 181
 182         newmask = readl(host->base + host->sdiimsk);
 183         newmask &= ~imask;
 184
 185         writel(newmask, host->base + host->sdiimsk);
 186
 187         return newmask;
 188 }
 189
 190 static inline void clear_imask(struct s3cmci_host *host)
 191 {
 192         writel(0, host->base + host->sdiimsk);
 193 }
 194
 195 static inline int get_data_buffer(struct s3cmci_host *host,
 196                                   u32 *bytes, u32 **pointer)
 197 {
 198         struct scatterlist *sg;
 199
 200         if (host->pio_active == XFER_NONE)
 201                 return -EINVAL;
 202
 203         if ((!host->mrq) || (!host->mrq->data))
 204                 return -EINVAL;
 205
 206         if (host->pio_sgptr >= host->mrq->data->sg_len) {
 207                 dbg(host, dbg_debug, "no more buffers (%i/%i)\n",
 208                       host->pio_sgptr, host->mrq->data->sg_len);
 209                 return -EBUSY;
 210         }
 211         sg = &host->mrq->data->sg[host->pio_sgptr];
 212
 213         *bytes = sg->length;
 214         *pointer = sg_virt(sg);
 215
 216         host->pio_sgptr++;
 217
 218         dbg(host, dbg_sg, "new buffer (%i/%i)\n",
 219             host->pio_sgptr, host->mrq->data->sg_len);
 220
 221         return 0;
 222 }
 223
 224 static inline u32 fifo_count(struct s3cmci_host *host)
 225 {
 226         u32 fifostat = readl(host->base + S3C2410_SDIFSTA);
 227
 228         fifostat &= S3C2410_SDIFSTA_COUNTMASK;
 229         return fifostat;
 230 }
 231
 232 static inline u32 fifo_free(struct s3cmci_host *host)
 233 {
 234         u32 fifostat = readl(host->base + S3C2410_SDIFSTA);
 235
 236         fifostat &= S3C2410_SDIFSTA_COUNTMASK;
 237         return 63 - fifostat;
 238 }
 239
 240 static void do_pio_read(struct s3cmci_host *host)
 241 {
 242         int res;
 243         u32 fifo;
 244         u32 *ptr;
 245         u32 fifo_words;
 246         void __iomem *from_ptr;
 247
 248         /* write real prescaler to host, it might be set slow to fix */
 249         writel(host->prescaler, host->base + S3C2410_SDIPRE);
 250
 251         from_ptr = host->base + host->sdidata;
 252
 253         while ((fifo = fifo_count(host))) {
 254                 if (!host->pio_bytes) {
 255                         res = get_data_buffer(host, &host->pio_bytes,
 256                                               &host->pio_ptr);
 257                         if (res) {
 258                                 host->pio_active = XFER_NONE;
 259                                 host->complete_what = COMPLETION_FINALIZE;
 260
 261                                 dbg(host, dbg_pio, "pio_read(): "
 262                                     "complete (no more data).\n");
 263                                 return;
 264                         }
 265
 266                         dbg(host, dbg_pio,
 267                             "pio_read(): new target: [%i]@[%p]\n",
 268                             host->pio_bytes, host->pio_ptr);
 269                 }
 270
 271                 dbg(host, dbg_pio,
 272                     "pio_read(): fifo:[%02i] buffer:[%03i] dcnt:[%08X]\n",
 273                     fifo, host->pio_bytes,
 274                     readl(host->base + S3C2410_SDIDCNT));
 275
 276                 /* If we have reached the end of the block, we can
 277                  * read a word and get 1 to 3 bytes.  If we in the
 278                  * middle of the block, we have to read full words,
 279                  * otherwise we will write garbage, so round down to
 280                  * an even multiple of 4. */
 281                 if (fifo >= host->pio_bytes)
 282                         fifo = host->pio_bytes;
 283                 else
 284                         fifo -= fifo & 3;
 285
 286                 host->pio_bytes -= fifo;
 287                 host->pio_count += fifo;
 288
 289                 fifo_words = fifo >> 2;
 290                 ptr = host->pio_ptr;
 291                 while (fifo_words--)
 292                         *ptr++ = readl(from_ptr);
 293                 host->pio_ptr = ptr;
 294
 295                 if (fifo & 3) {
 296                         u32 n = fifo & 3;
 297                         u32 data = readl(from_ptr);
 298                         u8 *p = (u8 *)host->pio_ptr;
 299
 300                         while (n--) {
 301                                 *p++ = data;
 302                                 data >>= 8;
 303                         }
 304                 }
 305         }
 306
 307         if (!host->pio_bytes) {
 308                 res = get_data_buffer(host, &host->pio_bytes, &host->pio_ptr);
 309                 if (res) {
 310                         dbg(host, dbg_pio,
 311                             "pio_read(): complete (no more buffers).\n");
 312                         host->pio_active = XFER_NONE;
 313                         host->complete_what = COMPLETION_FINALIZE;
 314
 315                         return;
 316                 }
 317         }
 318
 319         enable_imask(host,
 320                      S3C2410_SDIIMSK_RXFIFOHALF | S3C2410_SDIIMSK_RXFIFOLAST);
 321 }
 322
 323 static void do_pio_write(struct s3cmci_host *host)
 324 {
 325         void __iomem *to_ptr;
 326         int res;
 327         u32 fifo;
 328         u32 *ptr;
 329
 330         to_ptr = host->base + host->sdidata;
 331
 332         while ((fifo = fifo_free(host))) {
 333                 if (!host->pio_bytes) {
 334                         res = get_data_buffer(host, &host->pio_bytes,
 335                                                         &host->pio_ptr);
 336                         if (res) {
 337                                 dbg(host, dbg_pio,
 338                                     "pio_write(): complete (no more data).\n");
 339                                 host->pio_active = XFER_NONE;
 340
 341                                 return;
 342                         }
 343
 344                         dbg(host, dbg_pio,
 345                             "pio_write(): new source: [%i]@[%p]\n",
 346                             host->pio_bytes, host->pio_ptr);
 347
 348                 }
 349
 350                 /* If we have reached the end of the block, we have to
 351                  * write exactly the remaining number of bytes.  If we
 352                  * in the middle of the block, we have to write full
 353                  * words, so round down to an even multiple of 4. */
 354                 if (fifo >= host->pio_bytes)
 355                         fifo = host->pio_bytes;
 356                 else
 357                         fifo -= fifo & 3;
 358
 359                 host->pio_bytes -= fifo;
 360                 host->pio_count += fifo;
 361
 362                 fifo = (fifo + 3) >> 2;
 363                 ptr = host->pio_ptr;
 364                 while (fifo--)
 365                         writel(*ptr++, to_ptr);
 366                 host->pio_ptr = ptr;
 367         }
 368
 369         enable_imask(host, S3C2410_SDIIMSK_TXFIFOHALF);
 370 }
 371
 372 static void pio_tasklet(unsigned long data)
 373 {
 374         struct s3cmci_host *host = (struct s3cmci_host *) data;
 375
 376
 377         disable_irq(host->irq);
 378
 379         if (host->pio_active == XFER_WRITE)
 380                 do_pio_write(host);
 381
 382         if (host->pio_active == XFER_READ)
 383                 do_pio_read(host);
 384
 385         if (host->complete_what == COMPLETION_FINALIZE) {
 386                 clear_imask(host);
 387                 if (host->pio_active != XFER_NONE) {
 388                         dbg(host, dbg_err, "unfinished %s "
 389                             "- pio_count:[%u] pio_bytes:[%u]\n",
 390                             (host->pio_active == XFER_READ) ? "read" : "write",
 391                             host->pio_count, host->pio_bytes);
 392
 393                         if (host->mrq->data)
 394                                 host->mrq->data->error = -EINVAL;
 395                 }
 396
 397                 finalize_request(host);
 398         } else
 399                 enable_irq(host->irq);
 400 }
 401
 402 /*
 403  * ISR for SDI Interface IRQ
 404  * Communication between driver and ISR works as follows:
 405  *   host->mrq                  points to current request
 406  *   host->complete_what        Indicates when the request is considered done
 407  *     COMPLETION_CMDSENT         when the command was sent
 408  *     COMPLETION_RSPFIN          when a response was received
 409  *     COMPLETION_XFERFINISH      when the data transfer is finished
 410  *     COMPLETION_XFERFINISH_RSPFIN both of the above.
 411  *   host->complete_request     is the completion-object the driver waits for
 412  *
 413  * 1) Driver sets up host->mrq and host->complete_what
 414  * 2) Driver prepares the transfer
 415  * 3) Driver enables interrupts
 416  * 4) Driver starts transfer
 417  * 5) Driver waits for host->complete_rquest
 418  * 6) ISR checks for request status (errors and success)
 419  * 6) ISR sets host->mrq->cmd->error and host->mrq->data->error
 420  * 7) ISR completes host->complete_request
 421  * 8) ISR disables interrupts
 422  * 9) Driver wakes up and takes care of the request
 423  *
 424  * Note: "->error"-fields are expected to be set to 0 before the request
 425  *       was issued by mmc.c - therefore they are only set, when an error
 426  *       contition comes up
 427  */
 428
 429 static irqreturn_t s3cmci_irq(int irq, void *dev_id)
 430 {
 431         struct s3cmci_host *host = dev_id;
 432         struct mmc_command *cmd;
 433         u32 mci_csta, mci_dsta, mci_fsta, mci_dcnt, mci_imsk;
 434         u32 mci_cclear, mci_dclear;
 435         unsigned long iflags;
 436
 437         spin_lock_irqsave(&host->complete_lock, iflags);
 438
 439         mci_csta = readl(host->base + S3C2410_SDICMDSTAT);
 440         mci_dsta = readl(host->base + S3C2410_SDIDSTA);
 441         mci_dcnt = readl(host->base + S3C2410_SDIDCNT);
 442         mci_fsta = readl(host->base + S3C2410_SDIFSTA);
 443         mci_imsk = readl(host->base + host->sdiimsk);
 444         mci_cclear = 0;
 445         mci_dclear = 0;
 446
 447         if ((host->complete_what == COMPLETION_NONE) ||
 448             (host->complete_what == COMPLETION_FINALIZE)) {
 449                 host->status = "nothing to complete";
 450                 clear_imask(host);
 451                 goto irq_out;
 452         }
 453
 454         if (!host->mrq) {
 455                 host->status = "no active mrq";
 456                 clear_imask(host);
 457                 goto irq_out;
 458         }
 459
 460         cmd = host->cmd_is_stop ? host->mrq->stop : host->mrq->cmd;
 461
 462         if (!cmd) {
 463                 host->status = "no active cmd";
 464                 clear_imask(host);
 465                 goto irq_out;
 466         }
 467
 468         if (!host->dodma) {
 469                 if ((host->pio_active == XFER_WRITE) &&
 470                     (mci_fsta & S3C2410_SDIFSTA_TFDET)) {
 471
 472                         disable_imask(host, S3C2410_SDIIMSK_TXFIFOHALF);
 473                         tasklet_schedule(&host->pio_tasklet);
 474                         host->status = "pio tx";
 475                 }
 476
 477                 if ((host->pio_active == XFER_READ) &&
 478                     (mci_fsta & S3C2410_SDIFSTA_RFDET)) {
 479
 480                         disable_imask(host,
 481                                       S3C2410_SDIIMSK_RXFIFOHALF |
 482                                       S3C2410_SDIIMSK_RXFIFOLAST);
 483
 484                         tasklet_schedule(&host->pio_tasklet);
 485                         host->status = "pio rx";
 486                 }
 487         }
 488
 489         if (mci_csta & S3C2410_SDICMDSTAT_CMDTIMEOUT) {
 490                 dbg(host, dbg_err, "CMDSTAT: error CMDTIMEOUT\n");
 491                 cmd->error = -ETIMEDOUT;
 492                 host->status = "error: command timeout";
 493                 goto fail_transfer;
 494         }
 495
 496         if (mci_csta & S3C2410_SDICMDSTAT_CMDSENT) {
 497                 if (host->complete_what == COMPLETION_CMDSENT) {
 498                         host->status = "ok: command sent";
 499                         goto close_transfer;
 500                 }
 501
 502                 mci_cclear |= S3C2410_SDICMDSTAT_CMDSENT;
 503         }
 504
 505         if (mci_csta & S3C2410_SDICMDSTAT_CRCFAIL) {
 506                 if (cmd->flags & MMC_RSP_CRC) {
 507                         if (host->mrq->cmd->flags & MMC_RSP_136) {
 508                                 dbg(host, dbg_irq,
 509                                     "fixup: ignore CRC fail with long rsp\n");
 510                         } else {
 511                                 /* note, we used to fail the transfer
 512                                  * here, but it seems that this is just
 513                                  * the hardware getting it wrong.
 514                                  *
 515                                  * cmd->error = -EILSEQ;
 516                                  * host->status = "error: bad command crc";
 517                                  * goto fail_transfer;
 518                                 */
 519                         }
 520                 }
 521
 522                 mci_cclear |= S3C2410_SDICMDSTAT_CRCFAIL;
 523         }
 524
 525         if (mci_csta & S3C2410_SDICMDSTAT_RSPFIN) {
 526                 if (host->complete_what == COMPLETION_RSPFIN) {
 527                         host->status = "ok: command response received";
 528                         goto close_transfer;
 529                 }
 530
 531                 if (host->complete_what == COMPLETION_XFERFINISH_RSPFIN)
 532                         host->complete_what = COMPLETION_XFERFINISH;
 533
 534                 mci_cclear |= S3C2410_SDICMDSTAT_RSPFIN;
 535         }
 536
 537         /* errors handled after this point are only relevant
 538            when a data transfer is in progress */
 539
 540         if (!cmd->data)
 541                 goto clear_status_bits;
 542
 543         /* Check for FIFO failure */
 544         if (host->is2440) {
 545                 if (mci_fsta & S3C2440_SDIFSTA_FIFOFAIL) {
 546                         dbg(host, dbg_err, "FIFO failure\n");
 547                         host->mrq->data->error = -EILSEQ;
 548                         host->status = "error: 2440 fifo failure";
 549                         goto fail_transfer;
 550                 }
 551         } else {
 552                 if (mci_dsta & S3C2410_SDIDSTA_FIFOFAIL) {
 553                         dbg(host, dbg_err, "FIFO failure\n");
 554                         cmd->data->error = -EILSEQ;
 555                         host->status = "error:  fifo failure";
 556                         goto fail_transfer;
 557                 }
 558         }
 559
 560         if (mci_dsta & S3C2410_SDIDSTA_RXCRCFAIL) {
 561                 dbg(host, dbg_err, "bad data crc (outgoing)\n");
 562                 cmd->data->error = -EILSEQ;
 563                 host->status = "error: bad data crc (outgoing)";
 564                 goto fail_transfer;
 565         }
 566
 567         if (mci_dsta & S3C2410_SDIDSTA_CRCFAIL) {
 568                 dbg(host, dbg_err, "bad data crc (incoming)\n");
 569                 cmd->data->error = -EILSEQ;
 570                 host->status = "error: bad data crc (incoming)";
 571                 goto fail_transfer;
 572         }
 573
 574         if (mci_dsta & S3C2410_SDIDSTA_DATATIMEOUT) {
 575                 dbg(host, dbg_err, "data timeout\n");
 576                 cmd->data->error = -ETIMEDOUT;
 577                 host->status = "error: data timeout";
 578                 goto fail_transfer;
 579         }
 580
 581         if (mci_dsta & S3C2410_SDIDSTA_XFERFINISH) {
 582                 if (host->complete_what == COMPLETION_XFERFINISH) {
 583                         host->status = "ok: data transfer completed";
 584                         goto close_transfer;
 585                 }
 586
 587                 if (host->complete_what == COMPLETION_XFERFINISH_RSPFIN)
 588                         host->complete_what = COMPLETION_RSPFIN;
 589
 590                 mci_dclear |= S3C2410_SDIDSTA_XFERFINISH;
 591         }
 592
 593 clear_status_bits:
 594         writel(mci_cclear, host->base + S3C2410_SDICMDSTAT);
 595         writel(mci_dclear, host->base + S3C2410_SDIDSTA);
 596
 597         goto irq_out;
 598
 599 fail_transfer:
 600         host->pio_active = XFER_NONE;
 601
 602 close_transfer:
 603         host->complete_what = COMPLETION_FINALIZE;
 604
 605         clear_imask(host);
 606         tasklet_schedule(&host->pio_tasklet);
 607
 608         goto irq_out;
 609
 610 irq_out:
 611         dbg(host, dbg_irq,
 612             "csta:0x%08x dsta:0x%08x fsta:0x%08x dcnt:0x%08x status:%s.\n",
 613             mci_csta, mci_dsta, mci_fsta, mci_dcnt, host->status);
 614
 615         spin_unlock_irqrestore(&host->complete_lock, iflags);
 616         return IRQ_HANDLED;
 617
 618 }
 619
 620 /*
 621  * ISR for the CardDetect Pin
 622 */
 623
 624 static irqreturn_t s3cmci_irq_cd(int irq, void *dev_id)
 625 {
 626         struct s3cmci_host *host = (struct s3cmci_host *)dev_id;
 627
 628         dbg(host, dbg_irq, "card detect\n");
 629
 630         mmc_detect_change(host->mmc, msecs_to_jiffies(500));
 631
 632         return IRQ_HANDLED;
 633 }
 634
 635 static void s3cmci_dma_done_callback(struct s3c2410_dma_chan *dma_ch,
 636                                      void *buf_id, int size,
 637                                      enum s3c2410_dma_buffresult result)
 638 {
 639         struct s3cmci_host *host = buf_id;
 640         unsigned long iflags;
 641         u32 mci_csta, mci_dsta, mci_fsta, mci_dcnt;
 642
 643         mci_csta = readl(host->base + S3C2410_SDICMDSTAT);
 644         mci_dsta = readl(host->base + S3C2410_SDIDSTA);
 645         mci_fsta = readl(host->base + S3C2410_SDIFSTA);
 646         mci_dcnt = readl(host->base + S3C2410_SDIDCNT);
 647
 648         BUG_ON(!host->mrq);
 649         BUG_ON(!host->mrq->data);
 650         BUG_ON(!host->dmatogo);
 651
 652         spin_lock_irqsave(&host->complete_lock, iflags);
 653
 654         if (result != S3C2410_RES_OK) {
 655                 dbg(host, dbg_fail, "DMA FAILED: csta=0x%08x dsta=0x%08x "
 656                         "fsta=0x%08x dcnt:0x%08x result:0x%08x toGo:%u\n",
 657                         mci_csta, mci_dsta, mci_fsta,
 658                         mci_dcnt, result, host->dmatogo);
 659
 660                 goto fail_request;
 661         }
 662
 663         host->dmatogo--;
 664         if (host->dmatogo) {
 665                 dbg(host, dbg_dma, "DMA DONE  Size:%i DSTA:[%08x] "
 666                         "DCNT:[%08x] toGo:%u\n",
 667                         size, mci_dsta, mci_dcnt, host->dmatogo);
 668
 669                 goto out;
 670         }
 671
 672         dbg(host, dbg_dma, "DMA FINISHED Size:%i DSTA:%08x DCNT:%08x\n",
 673                 size, mci_dsta, mci_dcnt);
 674
 675         host->complete_what = COMPLETION_FINALIZE;
 676
 677 out:
 678         tasklet_schedule(&host->pio_tasklet);
 679         spin_unlock_irqrestore(&host->complete_lock, iflags);
 680         return;
 681
 682 fail_request:
 683         host->mrq->data->error = -EINVAL;
 684         host->complete_what = COMPLETION_FINALIZE;
 685         writel(0, host->base + host->sdiimsk);
 686         goto out;
 687
 688 }
 689
 690 static void finalize_request(struct s3cmci_host *host)
 691 {
 692         struct mmc_request *mrq = host->mrq;
 693         struct mmc_command *cmd = host->cmd_is_stop ? mrq->stop : mrq->cmd;
 694         int debug_as_failure = 0;
 695
 696         if (host->complete_what != COMPLETION_FINALIZE)
 697                 return;
 698
 699         if (!mrq)
 700                 return;
 701
 702         if (cmd->data && (cmd->error == 0) &&
 703             (cmd->data->error == 0)) {
 704                 if (host->dodma && (!host->dma_complete)) {
 705                         dbg(host, dbg_dma, "DMA Missing!\n");
 706                         return;
 707                 }
 708         }
 709
 710         /* Read response from controller. */
 711         cmd->resp[0] = readl(host->base + S3C2410_SDIRSP0);
 712         cmd->resp[1] = readl(host->base + S3C2410_SDIRSP1);
 713         cmd->resp[2] = readl(host->base + S3C2410_SDIRSP2);
 714         cmd->resp[3] = readl(host->base + S3C2410_SDIRSP3);
 715
 716         writel(host->prescaler, host->base + S3C2410_SDIPRE);
 717
 718         if (cmd->error)
 719                 debug_as_failure = 1;
 720
 721         if (cmd->data && cmd->data->error)
 722                 debug_as_failure = 1;
 723
 724         dbg_dumpcmd(host, cmd, debug_as_failure);
 725
 726         /* Cleanup controller */
 727         writel(0, host->base + S3C2410_SDICMDARG);
 728         writel(S3C2410_SDIDCON_STOP, host->base + S3C2410_SDIDCON);
 729         writel(0, host->base + S3C2410_SDICMDCON);
 730         writel(0, host->base + host->sdiimsk);
 731
 732         if (cmd->data && cmd->error)
 733                 cmd->data->error = cmd->error;
 734
 735         if (cmd->data && cmd->data->stop && (!host->cmd_is_stop)) {
 736                 host->cmd_is_stop = 1;
 737                 s3cmci_send_request(host->mmc);
 738                 return;
 739         }
 740
 741         /* If we have no data transfer we are finished here */
 742         if (!mrq->data)
 743                 goto request_done;
 744
 745         /* Calulate the amout of bytes transfer if there was no error */
 746         if (mrq->data->error == 0) {
 747                 mrq->data->bytes_xfered =
 748                         (mrq->data->blocks * mrq->data->blksz);
 749         } else {
 750                 mrq->data->bytes_xfered = 0;
 751         }
 752
 753         /* If we had an error while transfering data we flush the
 754          * DMA channel and the fifo to clear out any garbage. */
 755         if (mrq->data->error != 0) {
 756                 if (host->dodma)
 757                         s3c2410_dma_ctrl(host->dma, S3C2410_DMAOP_FLUSH);
 758
 759                 if (host->is2440) {
 760                         /* Clear failure register and reset fifo. */
 761                         writel(S3C2440_SDIFSTA_FIFORESET |
 762                                S3C2440_SDIFSTA_FIFOFAIL,
 763                                host->base + S3C2410_SDIFSTA);
 764                 } else {
 765                         u32 mci_con;
 766
 767                         /* reset fifo */
 768                         mci_con = readl(host->base + S3C2410_SDICON);
 769                         mci_con |= S3C2410_SDICON_FIFORESET;
 770
 771                         writel(mci_con, host->base + S3C2410_SDICON);
 772                 }
 773         }
 774
 775 request_done:
 776         host->complete_what = COMPLETION_NONE;
 777         host->mrq = NULL;
 778         mmc_request_done(host->mmc, mrq);
 779 }
 780
 781 static void s3cmci_dma_setup(struct s3cmci_host *host,
 782                              enum s3c2410_dmasrc source)
 783 {
 784         static enum s3c2410_dmasrc last_source = -1;
 785         static int setup_ok;
 786
 787         if (last_source == source)
 788                 return;
 789
 790         last_source = source;
 791
 792         s3c2410_dma_devconfig(host->dma, source, 3,
 793                               host->mem->start + host->sdidata);
 794
 795         if (!setup_ok) {
 796                 s3c2410_dma_config(host->dma, 4,
 797                         (S3C2410_DCON_HWTRIG | S3C2410_DCON_CH0_SDI));
 798                 s3c2410_dma_set_buffdone_fn(host->dma,
 799                                             s3cmci_dma_done_callback);
 800                 s3c2410_dma_setflags(host->dma, S3C2410_DMAF_AUTOSTART);
 801                 setup_ok = 1;
 802         }
 803 }
 804
 805 static void s3cmci_send_command(struct s3cmci_host *host,
 806                                         struct mmc_command *cmd)
 807 {
 808         u32 ccon, imsk;
 809
 810         imsk  = S3C2410_SDIIMSK_CRCSTATUS | S3C2410_SDIIMSK_CMDTIMEOUT |
 811                 S3C2410_SDIIMSK_RESPONSEND | S3C2410_SDIIMSK_CMDSENT |
 812                 S3C2410_SDIIMSK_RESPONSECRC;
 813
 814         enable_imask(host, imsk);
 815
 816         if (cmd->data)
 817                 host->complete_what = COMPLETION_XFERFINISH_RSPFIN;
 818         else if (cmd->flags & MMC_RSP_PRESENT)
 819                 host->complete_what = COMPLETION_RSPFIN;
 820         else
 821                 host->complete_what = COMPLETION_CMDSENT;
 822
 823         writel(cmd->arg, host->base + S3C2410_SDICMDARG);
 824
 825         ccon  = cmd->opcode & S3C2410_SDICMDCON_INDEX;
 826         ccon |= S3C2410_SDICMDCON_SENDERHOST | S3C2410_SDICMDCON_CMDSTART;
 827
 828         if (cmd->flags & MMC_RSP_PRESENT)
 829                 ccon |= S3C2410_SDICMDCON_WAITRSP;
 830
 831         if (cmd->flags & MMC_RSP_136)
 832                 ccon |= S3C2410_SDICMDCON_LONGRSP;
 833
 834         writel(ccon, host->base + S3C2410_SDICMDCON);
 835 }
 836
 837 static int s3cmci_setup_data(struct s3cmci_host *host, struct mmc_data *data)
 838 {
 839         u32 dcon, imsk, stoptries = 3;
 840
 841         /* write DCON register */
 842
 843         if (!data) {
 844                 writel(0, host->base + S3C2410_SDIDCON);
 845                 return 0;
 846         }
 847
 848         if ((data->blksz & 3) != 0) {
 849                 /* We cannot deal with unaligned blocks with more than
 850                  * one block being transfered. */
 851
 852                 if (data->blocks > 1) {
 853                         pr_warning("%s: can't do non-word sized block transfers (blksz %d)\n", __func__, data->blksz);
 854                         return -EINVAL;
 855                 }
 856         }
 857
 858         while (readl(host->base + S3C2410_SDIDSTA) &
 859                (S3C2410_SDIDSTA_TXDATAON | S3C2410_SDIDSTA_RXDATAON)) {
 860
 861                 dbg(host, dbg_err,
 862                     "mci_setup_data() transfer stillin progress.\n");
 863
 864                 writel(S3C2410_SDIDCON_STOP, host->base + S3C2410_SDIDCON);
 865                 s3cmci_reset(host);
 866
 867                 if ((stoptries--) == 0) {
 868                         dbg_dumpregs(host, "DRF");
 869                         return -EINVAL;
 870                 }
 871         }
 872
 873         dcon  = data->blocks & S3C2410_SDIDCON_BLKNUM_MASK;
 874
 875         if (host->dodma)
 876                 dcon |= S3C2410_SDIDCON_DMAEN;
 877
 878         if (host->bus_width == MMC_BUS_WIDTH_4)
 879                 dcon |= S3C2410_SDIDCON_WIDEBUS;
 880
 881         if (!(data->flags & MMC_DATA_STREAM))
 882                 dcon |= S3C2410_SDIDCON_BLOCKMODE;
 883
 884         if (data->flags & MMC_DATA_WRITE) {
 885                 dcon |= S3C2410_SDIDCON_TXAFTERRESP;
 886                 dcon |= S3C2410_SDIDCON_XFER_TXSTART;
 887         }
 888
 889         if (data->flags & MMC_DATA_READ) {
 890                 dcon |= S3C2410_SDIDCON_RXAFTERCMD;
 891                 dcon |= S3C2410_SDIDCON_XFER_RXSTART;
 892         }
 893
 894         if (host->is2440) {
 895                 dcon |= S3C2440_SDIDCON_DS_WORD;
 896                 dcon |= S3C2440_SDIDCON_DATSTART;
 897         }
 898
 899         writel(dcon, host->base + S3C2410_SDIDCON);
 900
 901         /* write BSIZE register */
 902
 903         writel(data->blksz, host->base + S3C2410_SDIBSIZE);
 904
 905         /* add to IMASK register */
 906         imsk = S3C2410_SDIIMSK_FIFOFAIL | S3C2410_SDIIMSK_DATACRC |
 907                S3C2410_SDIIMSK_DATATIMEOUT | S3C2410_SDIIMSK_DATAFINISH;
 908
 909         enable_imask(host, imsk);
 910
 911         /* write TIMER register */
 912
 913         if (host->is2440) {
 914                 writel(0x007FFFFF, host->base + S3C2410_SDITIMER);
 915         } else {
 916                 writel(0x0000FFFF, host->base + S3C2410_SDITIMER);
 917
 918                 /* FIX: set slow clock to prevent timeouts on read */
 919                 if (data->flags & MMC_DATA_READ)
 920                         writel(0xFF, host->base + S3C2410_SDIPRE);
 921         }
 922
 923         return 0;
 924 }
 925
 926 #define BOTH_DIR (MMC_DATA_WRITE | MMC_DATA_READ)
 927
 928 static int s3cmci_prepare_pio(struct s3cmci_host *host, struct mmc_data *data)
 929 {
 930         int rw = (data->flags & MMC_DATA_WRITE) ? 1 : 0;
 931
 932         BUG_ON((data->flags & BOTH_DIR) == BOTH_DIR);
 933
 934         host->pio_sgptr = 0;
 935         host->pio_bytes = 0;
 936         host->pio_count = 0;
 937         host->pio_active = rw ? XFER_WRITE : XFER_READ;
 938
 939         if (rw) {
 940                 do_pio_write(host);
 941                 enable_imask(host, S3C2410_SDIIMSK_TXFIFOHALF);
 942         } else {
 943                 enable_imask(host, S3C2410_SDIIMSK_RXFIFOHALF
 944                              | S3C2410_SDIIMSK_RXFIFOLAST);
 945         }
 946
 947         return 0;
 948 }
 949
 950 static int s3cmci_prepare_dma(struct s3cmci_host *host, struct mmc_data *data)
 951 {
 952         int dma_len, i;
 953         int rw = (data->flags & MMC_DATA_WRITE) ? 1 : 0;
 954
 955         BUG_ON((data->flags & BOTH_DIR) == BOTH_DIR);
 956
 957         s3cmci_dma_setup(host, rw ? S3C2410_DMASRC_MEM : S3C2410_DMASRC_HW);
 958         s3c2410_dma_ctrl(host->dma, S3C2410_DMAOP_FLUSH);
 959
 960         dma_len = dma_map_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
 961                              (rw) ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
 962
 963         if (dma_len == 0)
 964                 return -ENOMEM;
 965
 966         host->dma_complete = 0;
 967         host->dmatogo = dma_len;
 968
 969         for (i = 0; i < dma_len; i++) {
 970                 int res;
 971
 972                 dbg(host, dbg_dma, "enqueue %i:%u@%u\n", i,
 973                         sg_dma_address(&data->sg[i]),
 974                         sg_dma_len(&data->sg[i]));
 975
 976                 res = s3c2410_dma_enqueue(host->dma, (void *) host,
 977                                           sg_dma_address(&data->sg[i]),
 978                                           sg_dma_len(&data->sg[i]));
 979
 980                 if (res) {
 981                         s3c2410_dma_ctrl(host->dma, S3C2410_DMAOP_FLUSH);
 982                         return -EBUSY;
 983                 }
 984         }
 985
 986         s3c2410_dma_ctrl(host->dma, S3C2410_DMAOP_START);
 987
 988         return 0;
 989 }
 990
 991 static void s3cmci_send_request(struct mmc_host *mmc)
 992 {
 993         struct s3cmci_host *host = mmc_priv(mmc);
 994         struct mmc_request *mrq = host->mrq;
 995         struct mmc_command *cmd = host->cmd_is_stop ? mrq->stop : mrq->cmd;
 996
 997         host->ccnt++;
 998         prepare_dbgmsg(host, cmd, host->cmd_is_stop);
 999
1000         /* Clear command, data and fifo status registers
1001            Fifo clear only necessary on 2440, but doesn't hurt on 2410
1002         */
1003         writel(0xFFFFFFFF, host->base + S3C2410_SDICMDSTAT);
1004         writel(0xFFFFFFFF, host->base + S3C2410_SDIDSTA);
1005         writel(0xFFFFFFFF, host->base + S3C2410_SDIFSTA);
1006
1007         if (cmd->data) {
1008                 int res = s3cmci_setup_data(host, cmd->data);
1009
1010                 host->dcnt++;
1011
1012                 if (res) {
1013                         dbg(host, dbg_err, "setup data error %d\n", res);
1014                         cmd->error = res;
1015                         cmd->data->error = res;
1016
1017                         mmc_request_done(mmc, mrq);
1018                         return;
1019                 }
1020
1021                 if (host->dodma)
1022                         res = s3cmci_prepare_dma(host, cmd->data);
1023                 else
1024                         res = s3cmci_prepare_pio(host, cmd->data);
1025
1026                 if (res) {
1027                         dbg(host, dbg_err, "data prepare error %d\n", res);
1028                         cmd->error = res;
1029                         cmd->data->error = res;
1030
1031                         mmc_request_done(mmc, mrq);
1032                         return;
1033                 }
1034         }
1035
1036         /* Send command */
1037         s3cmci_send_command(host, cmd);
1038
1039         /* Enable Interrupt */
1040         enable_irq(host->irq);
1041 }
1042
1043 static int s3cmci_card_present(struct mmc_host *mmc)
1044 {
1045         struct s3cmci_host *host = mmc_priv(mmc);
1046         struct s3c24xx_mci_pdata *pdata = host->pdata;
1047         int ret;
1048
1049         if (pdata->gpio_detect == 0)
1050                 return -ENOSYS;
1051
1052         ret = s3c2410_gpio_getpin(pdata->gpio_detect) ? 0 : 1;
1053         return ret ^ pdata->detect_invert;
1054 }
1055
1056 static void s3cmci_request(struct mmc_host *mmc, struct mmc_request *mrq)
1057 {
1058         struct s3cmci_host *host = mmc_priv(mmc);
1059
1060         host->status = "mmc request";
1061         host->cmd_is_stop = 0;
1062         host->mrq = mrq;
1063
1064         if (s3cmci_card_present(mmc) == 0) {
1065                 dbg(host, dbg_err, "%s: no medium present\n", __func__);
1066                 host->mrq->cmd->error = -ENOMEDIUM;
1067                 mmc_request_done(mmc, mrq);
1068         } else
1069                 s3cmci_send_request(mmc);
1070 }
1071
1072 static void s3cmci_set_clk(struct s3cmci_host *host, struct mmc_ios *ios)
1073 {
1074         u32 mci_psc;
1075
1076         /* Set clock */
1077         for (mci_psc = 0; mci_psc < 255; mci_psc++) {
1078                 host->real_rate = host->clk_rate / (host->clk_div*(mci_psc+1));
1079
1080                 if (host->real_rate <= ios->clock)
1081                         break;
1082         }
1083
1084         if (mci_psc > 255)
1085                 mci_psc = 255;
1086
1087         host->prescaler = mci_psc;
1088         writel(host->prescaler, host->base + S3C2410_SDIPRE);
1089
1090         /* If requested clock is 0, real_rate will be 0, too */
1091         if (ios->clock == 0)
1092                 host->real_rate = 0;
1093 }
1094
1095 static void s3cmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1096 {
1097         struct s3cmci_host *host = mmc_priv(mmc);
1098         u32 mci_con;
1099
1100         /* Set the power state */
1101
1102         mci_con = readl(host->base + S3C2410_SDICON);
1103
1104         switch (ios->power_mode) {
1105         case MMC_POWER_ON:
1106         case MMC_POWER_UP:
1107                 s3c2410_gpio_cfgpin(S3C2410_GPE5, S3C2410_GPE5_SDCLK);
1108                 s3c2410_gpio_cfgpin(S3C2410_GPE6, S3C2410_GPE6_SDCMD);
1109                 s3c2410_gpio_cfgpin(S3C2410_GPE7, S3C2410_GPE7_SDDAT0);
1110                 s3c2410_gpio_cfgpin(S3C2410_GPE8, S3C2410_GPE8_SDDAT1);
1111                 s3c2410_gpio_cfgpin(S3C2410_GPE9, S3C2410_GPE9_SDDAT2);
1112                 s3c2410_gpio_cfgpin(S3C2410_GPE10, S3C2410_GPE10_SDDAT3);
1113
1114                 if (host->pdata->set_power)
1115                         host->pdata->set_power(ios->power_mode, ios->vdd);
1116
1117                 if (!host->is2440)
1118                         mci_con |= S3C2410_SDICON_FIFORESET;
1119
1120                 break;
1121
1122         case MMC_POWER_OFF:
1123         default:
1124                 s3c2410_gpio_setpin(S3C2410_GPE5, 0);
1125                 s3c2410_gpio_cfgpin(S3C2410_GPE5, S3C2410_GPE5_OUTP);
1126
1127                 if (host->is2440)
1128                         mci_con |= S3C2440_SDICON_SDRESET;
1129
1130                 if (host->pdata->set_power)
1131                         host->pdata->set_power(ios->power_mode, ios->vdd);
1132
1133                 break;
1134         }
1135
1136         s3cmci_set_clk(host, ios);
1137
1138         /* Set CLOCK_ENABLE */
1139         if (ios->clock)
1140                 mci_con |= S3C2410_SDICON_CLOCKTYPE;
1141         else
1142                 mci_con &= ~S3C2410_SDICON_CLOCKTYPE;
1143
1144         writel(mci_con, host->base + S3C2410_SDICON);
1145
1146         if ((ios->power_mode == MMC_POWER_ON) ||
1147             (ios->power_mode == MMC_POWER_UP)) {
1148                 dbg(host, dbg_conf, "running at %lukHz (requested: %ukHz).\n",
1149                         host->real_rate/1000, ios->clock/1000);
1150         } else {
1151                 dbg(host, dbg_conf, "powered down.\n");
1152         }
1153
1154         host->bus_width = ios->bus_width;
1155 }
1156
1157 static void s3cmci_reset(struct s3cmci_host *host)
1158 {
1159         u32 con = readl(host->base + S3C2410_SDICON);
1160
1161         con |= S3C2440_SDICON_SDRESET;
1162         writel(con, host->base + S3C2410_SDICON);
1163 }
1164
1165 static int s3cmci_get_ro(struct mmc_host *mmc)
1166 {
1167         struct s3cmci_host *host = mmc_priv(mmc);
1168         struct s3c24xx_mci_pdata *pdata = host->pdata;
1169         int ret;
1170
1171         if (pdata->gpio_wprotect == 0)
1172                 return 0;
1173
1174         ret = s3c2410_gpio_getpin(pdata->gpio_wprotect);
1175
1176         if (pdata->wprotect_invert)
1177                 ret = !ret;
1178
1179         return ret;
1180 }
1181
1182 static struct mmc_host_ops s3cmci_ops = {
1183         .request        = s3cmci_request,
1184         .set_ios        = s3cmci_set_ios,
1185         .get_ro         = s3cmci_get_ro,
1186         .get_cd         = s3cmci_card_present,
1187 };
1188
1189 static struct s3c24xx_mci_pdata s3cmci_def_pdata = {
1190         /* This is currently here to avoid a number of if (host->pdata)
1191          * checks. Any zero fields to ensure reaonable defaults are picked. */
1192 };
1193
1194 #ifdef CONFIG_CPU_FREQ
1195
1196 static int s3cmci_cpufreq_transition(struct notifier_block *nb,
1197                                      unsigned long val, void *data)
1198 {
1199         struct s3cmci_host *host;
1200         struct mmc_host *mmc;
1201         unsigned long newclk;
1202         unsigned long flags;
1203
1204         host = container_of(nb, struct s3cmci_host, freq_transition);
1205         newclk = clk_get_rate(host->clk);
1206         mmc = host->mmc;
1207
1208         if ((val == CPUFREQ_PRECHANGE && newclk > host->clk_rate) ||
1209             (val == CPUFREQ_POSTCHANGE && newclk < host->clk_rate)) {
1210                 spin_lock_irqsave(&mmc->lock, flags);
1211
1212                 host->clk_rate = newclk;
1213
1214                 if (mmc->ios.power_mode != MMC_POWER_OFF &&
1215                     mmc->ios.clock != 0)
1216                         s3cmci_set_clk(host, &mmc->ios);
1217
1218                 spin_unlock_irqrestore(&mmc->lock, flags);
1219         }
1220
1221         return 0;
1222 }
1223
1224 static inline int s3cmci_cpufreq_register(struct s3cmci_host *host)
1225 {
1226         host->freq_transition.notifier_call = s3cmci_cpufreq_transition;
1227
1228         return cpufreq_register_notifier(&host->freq_transition,
1229                                          CPUFREQ_TRANSITION_NOTIFIER);
1230 }
1231
1232 static inline void s3cmci_cpufreq_deregister(struct s3cmci_host *host)
1233 {
1234         cpufreq_unregister_notifier(&host->freq_transition,
1235                                     CPUFREQ_TRANSITION_NOTIFIER);
1236 }
1237
1238 #else
1239 static inline int s3cmci_cpufreq_register(struct s3cmci_host *host)
1240 {
1241         return 0;
1242 }
1243
1244 static inline void s3cmci_cpufreq_deregister(struct s3cmci_host *host)
1245 {
1246 }
1247 #endif
1248
1249 static int __devinit s3cmci_probe(struct platform_device *pdev, int is2440)
1250 {
1251         struct s3cmci_host *host;
1252         struct mmc_host *mmc;
1253         int ret;
1254
1255         mmc = mmc_alloc_host(sizeof(struct s3cmci_host), &pdev->dev);
1256         if (!mmc) {
1257                 ret = -ENOMEM;
1258                 goto probe_out;
1259         }
1260
1261         host = mmc_priv(mmc);
1262         host->mmc       = mmc;
1263         host->pdev      = pdev;
1264         host->is2440    = is2440;
1265
1266         host->pdata = pdev->dev.platform_data;
1267         if (!host->pdata) {
1268                 pdev->dev.platform_data = &s3cmci_def_pdata;
1269                 host->pdata = &s3cmci_def_pdata;
1270         }
1271
1272         spin_lock_init(&host->complete_lock);
1273         tasklet_init(&host->pio_tasklet, pio_tasklet, (unsigned long) host);
1274
1275         if (is2440) {
1276                 host->sdiimsk   = S3C2440_SDIIMSK;
1277                 host->sdidata   = S3C2440_SDIDATA;
1278                 host->clk_div   = 1;
1279         } else {
1280                 host->sdiimsk   = S3C2410_SDIIMSK;
1281                 host->sdidata   = S3C2410_SDIDATA;
1282                 host->clk_div   = 2;
1283         }
1284
1285         host->dodma             = 0;
1286         host->complete_what     = COMPLETION_NONE;
1287         host->pio_active        = XFER_NONE;
1288
1289         host->dma               = S3CMCI_DMA;
1290
1291         host->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1292         if (!host->mem) {
1293                 dev_err(&pdev->dev,
1294                         "failed to get io memory region resouce.\n");
1295
1296                 ret = -ENOENT;
1297                 goto probe_free_host;
1298         }
1299
1300         host->mem = request_mem_region(host->mem->start,
1301                                        RESSIZE(host->mem), pdev->name);
1302
1303         if (!host->mem) {
1304                 dev_err(&pdev->dev, "failed to request io memory region.\n");
1305                 ret = -ENOENT;
1306                 goto probe_free_host;
1307         }
1308
1309         host->base = ioremap(host->mem->start, RESSIZE(host->mem));
1310         if (!host->base) {
1311                 dev_err(&pdev->dev, "failed to ioremap() io memory region.\n");
1312                 ret = -EINVAL;
1313                 goto probe_free_mem_region;
1314         }
1315
1316         host->irq = platform_get_irq(pdev, 0);
1317         if (host->irq == 0) {
1318                 dev_err(&pdev->dev, "failed to get interrupt resouce.\n");
1319                 ret = -EINVAL;
1320                 goto probe_iounmap;
1321         }
1322
1323         if (request_irq(host->irq, s3cmci_irq, 0, DRIVER_NAME, host)) {
1324                 dev_err(&pdev->dev, "failed to request mci interrupt.\n");
1325                 ret = -ENOENT;
1326                 goto probe_iounmap;
1327         }
1328
1329         /* We get spurious interrupts even when we have set the IMSK
1330          * register to ignore everything, so use disable_irq() to make
1331          * ensure we don't lock the system with un-serviceable requests. */
1332
1333         disable_irq(host->irq);
1334
1335         host->irq_cd = s3c2410_gpio_getirq(host->pdata->gpio_detect);
1336
1337         if (host->irq_cd >= 0) {
1338                 if (request_irq(host->irq_cd, s3cmci_irq_cd,
1339                                 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
1340                                 DRIVER_NAME, host)) {
1341                         dev_err(&pdev->dev, "can't get card detect irq.\n");
1342                         ret = -ENOENT;
1343                         goto probe_free_irq;
1344                 }
1345         } else {
1346                 dev_warn(&pdev->dev, "host detect has no irq available\n");
1347                 s3c2410_gpio_cfgpin(host->pdata->gpio_detect,
1348                                     S3C2410_GPIO_INPUT);
1349         }
1350
1351         if (host->pdata->gpio_wprotect)
1352                 s3c2410_gpio_cfgpin(host->pdata->gpio_wprotect,
1353                                     S3C2410_GPIO_INPUT);
1354
1355         if (s3c2410_dma_request(S3CMCI_DMA, &s3cmci_dma_client, NULL) < 0) {
1356                 dev_err(&pdev->dev, "unable to get DMA channel.\n");
1357                 ret = -EBUSY;
1358                 goto probe_free_irq_cd;
1359         }
1360
1361         host->clk = clk_get(&pdev->dev, "sdi");
1362         if (IS_ERR(host->clk)) {
1363                 dev_err(&pdev->dev, "failed to find clock source.\n");
1364                 ret = PTR_ERR(host->clk);
1365                 host->clk = NULL;
1366                 goto probe_free_host;
1367         }
1368
1369         ret = clk_enable(host->clk);
1370         if (ret) {
1371                 dev_err(&pdev->dev, "failed to enable clock source.\n");
1372                 goto clk_free;
1373         }
1374
1375         host->clk_rate = clk_get_rate(host->clk);
1376
1377         mmc->ops        = &s3cmci_ops;
1378         mmc->ocr_avail  = MMC_VDD_32_33 | MMC_VDD_33_34;
1379         mmc->caps       = MMC_CAP_4_BIT_DATA;
1380         mmc->f_min      = host->clk_rate / (host->clk_div * 256);
1381         mmc->f_max      = host->clk_rate / host->clk_div;
1382
1383         if (host->pdata->ocr_avail)
1384                 mmc->ocr_avail = host->pdata->ocr_avail;
1385
1386         mmc->max_blk_count      = 4095;
1387         mmc->max_blk_size       = 4095;
1388         mmc->max_req_size       = 4095 * 512;
1389         mmc->max_seg_size       = mmc->max_req_size;
1390
1391         mmc->max_phys_segs      = 128;
1392         mmc->max_hw_segs        = 128;
1393
1394         dbg(host, dbg_debug,
1395             "probe: mode:%s mapped mci_base:%p irq:%u irq_cd:%u dma:%u.\n",
1396             (host->is2440?"2440":""),
1397             host->base, host->irq, host->irq_cd, host->dma);
1398
1399         ret = s3cmci_cpufreq_register(host);
1400         if (ret) {
1401                 dev_err(&pdev->dev, "failed to register cpufreq\n");
1402                 goto free_dmabuf;
1403         }
1404
1405         ret = mmc_add_host(mmc);
1406         if (ret) {
1407                 dev_err(&pdev->dev, "failed to add mmc host.\n");
1408                 goto free_cpufreq;
1409         }
1410
1411         platform_set_drvdata(pdev, mmc);
1412         dev_info(&pdev->dev, "initialisation done.\n");
1413
1414         return 0;
1415
1416  free_cpufreq:
1417         s3cmci_cpufreq_deregister(host);
1418
1419  free_dmabuf:
1420         clk_disable(host->clk);
1421
1422  clk_free:
1423         clk_put(host->clk);
1424
1425  probe_free_irq_cd:
1426         if (host->irq_cd >= 0)
1427                 free_irq(host->irq_cd, host);
1428
1429  probe_free_irq:
1430         free_irq(host->irq, host);
1431
1432  probe_iounmap:
1433         iounmap(host->base);
1434
1435  probe_free_mem_region:
1436         release_mem_region(host->mem->start, RESSIZE(host->mem));
1437
1438  probe_free_host:
1439         mmc_free_host(mmc);
1440  probe_out:
1441         return ret;
1442 }
1443
1444 static void s3cmci_shutdown(struct platform_device *pdev)
1445 {
1446         struct mmc_host *mmc = platform_get_drvdata(pdev);
1447         struct s3cmci_host *host = mmc_priv(mmc);
1448
1449         if (host->irq_cd >= 0)
1450                 free_irq(host->irq_cd, host);
1451
1452         s3cmci_cpufreq_deregister(host);
1453         mmc_remove_host(mmc);
1454         clk_disable(host->clk);
1455 }
1456
1457 static int __devexit s3cmci_remove(struct platform_device *pdev)
1458 {
1459         struct mmc_host         *mmc  = platform_get_drvdata(pdev);
1460         struct s3cmci_host      *host = mmc_priv(mmc);
1461
1462         s3cmci_shutdown(pdev);
1463
1464         clk_put(host->clk);
1465
1466         tasklet_disable(&host->pio_tasklet);
1467         s3c2410_dma_free(S3CMCI_DMA, &s3cmci_dma_client);
1468
1469         free_irq(host->irq, host);
1470
1471         iounmap(host->base);
1472         release_mem_region(host->mem->start, RESSIZE(host->mem));
1473
1474         mmc_free_host(mmc);
1475         return 0;
1476 }
1477
1478 static int __devinit s3cmci_2410_probe(struct platform_device *dev)
1479 {
1480         return s3cmci_probe(dev, 0);
1481 }
1482
1483 static int __devinit s3cmci_2412_probe(struct platform_device *dev)
1484 {
1485         return s3cmci_probe(dev, 1);
1486 }
1487
1488 static int __devinit s3cmci_2440_probe(struct platform_device *dev)
1489 {
1490         return s3cmci_probe(dev, 1);
1491 }
1492
1493 #ifdef CONFIG_PM
1494
1495 static int s3cmci_suspend(struct platform_device *dev, pm_message_t state)
1496 {
1497         struct mmc_host *mmc = platform_get_drvdata(dev);
1498
1499         return  mmc_suspend_host(mmc, state);
1500 }
1501
1502 static int s3cmci_resume(struct platform_device *dev)
1503 {
1504         struct mmc_host *mmc = platform_get_drvdata(dev);
1505
1506         return mmc_resume_host(mmc);
1507 }
1508
1509 #else /* CONFIG_PM */
1510 #define s3cmci_suspend NULL
1511 #define s3cmci_resume NULL
1512 #endif /* CONFIG_PM */
1513
1514
1515 static struct platform_driver s3cmci_2410_driver = {
1516         .driver.name    = "s3c2410-sdi",
1517         .driver.owner   = THIS_MODULE,
1518         .probe          = s3cmci_2410_probe,
1519         .remove         = __devexit_p(s3cmci_remove),
1520         .shutdown       = s3cmci_shutdown,
1521         .suspend        = s3cmci_suspend,
1522         .resume         = s3cmci_resume,
1523 };
1524
1525 static struct platform_driver s3cmci_2412_driver = {
1526         .driver.name    = "s3c2412-sdi",
1527         .driver.owner   = THIS_MODULE,
1528         .probe          = s3cmci_2412_probe,
1529         .remove         = __devexit_p(s3cmci_remove),
1530         .shutdown       = s3cmci_shutdown,
1531         .suspend        = s3cmci_suspend,
1532         .resume         = s3cmci_resume,
1533 };
1534
1535 static struct platform_driver s3cmci_2440_driver = {
1536         .driver.name    = "s3c2440-sdi",
1537         .driver.owner   = THIS_MODULE,
1538         .probe          = s3cmci_2440_probe,
1539         .remove         = __devexit_p(s3cmci_remove),
1540         .shutdown       = s3cmci_shutdown,
1541         .suspend        = s3cmci_suspend,
1542         .resume         = s3cmci_resume,
1543 };
1544
1545
1546 static int __init s3cmci_init(void)
1547 {
1548         platform_driver_register(&s3cmci_2410_driver);
1549         platform_driver_register(&s3cmci_2412_driver);
1550         platform_driver_register(&s3cmci_2440_driver);
1551         return 0;
1552 }
1553
1554 static void __exit s3cmci_exit(void)
1555 {
1556         platform_driver_unregister(&s3cmci_2410_driver);
1557         platform_driver_unregister(&s3cmci_2412_driver);
1558         platform_driver_unregister(&s3cmci_2440_driver);
1559 }
1560
1561 module_init(s3cmci_init);
1562 module_exit(s3cmci_exit);
1563
1564 MODULE_DESCRIPTION("Samsung S3C MMC/SD Card Interface driver");
1565 MODULE_LICENSE("GPL v2");
1566 MODULE_AUTHOR("Thomas Kleffel <tk@maintech.de>, Ben Dooks <ben-linux@fluff.org>");
1567 MODULE_ALIAS("platform:s3c2410-sdi");
1568 MODULE_ALIAS("platform:s3c2412-sdi");
1569 MODULE_ALIAS("platform:s3c2440-sdi");