kernel/drivers/mmc/host/tifm_sd.c

   1 /*
   2  *  tifm_sd.c - TI FlashMedia driver
   3  *
   4  *  Copyright (C) 2006 Alex Dubov <oakad@yahoo.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  * Special thanks to Brad Campbell for extensive testing of this driver.
  11  *
  12  */
  13
  14
  15 #include <linux/tifm.h>
  16 #include <linux/mmc/host.h>
  17 #include <linux/highmem.h>
  18 #include <linux/scatterlist.h>
  19 #include <linux/module.h>
  20 #include <asm/io.h>
  21
  22 #define DRIVER_NAME "tifm_sd"
  23 #define DRIVER_VERSION "0.8"
  24
  25 static bool no_dma = 0;
  26 static bool fixed_timeout = 0;
  27 module_param(no_dma, bool, 0644);
  28 module_param(fixed_timeout, bool, 0644);
  29
  30 /* Constants here are mostly from OMAP5912 datasheet */
  31 #define TIFM_MMCSD_RESET      0x0002
  32 #define TIFM_MMCSD_CLKMASK    0x03ff
  33 #define TIFM_MMCSD_POWER      0x0800
  34 #define TIFM_MMCSD_4BBUS      0x8000
  35 #define TIFM_MMCSD_RXDE       0x8000   /* rx dma enable */
  36 #define TIFM_MMCSD_TXDE       0x0080   /* tx dma enable */
  37 #define TIFM_MMCSD_BUFINT     0x0c00   /* set bits: AE, AF */
  38 #define TIFM_MMCSD_DPE        0x0020   /* data timeout counted in kilocycles */
  39 #define TIFM_MMCSD_INAB       0x0080   /* abort / initialize command */
  40 #define TIFM_MMCSD_READ       0x8000
  41
  42 #define TIFM_MMCSD_ERRMASK    0x01e0   /* set bits: CCRC, CTO, DCRC, DTO */
  43 #define TIFM_MMCSD_EOC        0x0001   /* end of command phase  */
  44 #define TIFM_MMCSD_CD         0x0002   /* card detect           */
  45 #define TIFM_MMCSD_CB         0x0004   /* card enter busy state */
  46 #define TIFM_MMCSD_BRS        0x0008   /* block received/sent   */
  47 #define TIFM_MMCSD_EOFB       0x0010   /* card exit busy state  */
  48 #define TIFM_MMCSD_DTO        0x0020   /* data time-out         */
  49 #define TIFM_MMCSD_DCRC       0x0040   /* data crc error        */
  50 #define TIFM_MMCSD_CTO        0x0080   /* command time-out      */
  51 #define TIFM_MMCSD_CCRC       0x0100   /* command crc error     */
  52 #define TIFM_MMCSD_AF         0x0400   /* fifo almost full      */
  53 #define TIFM_MMCSD_AE         0x0800   /* fifo almost empty     */
  54 #define TIFM_MMCSD_OCRB       0x1000   /* OCR busy              */
  55 #define TIFM_MMCSD_CIRQ       0x2000   /* card irq (cmd40/sdio) */
  56 #define TIFM_MMCSD_CERR       0x4000   /* card status error     */
  57
  58 #define TIFM_MMCSD_ODTO       0x0040   /* open drain / extended timeout */
  59 #define TIFM_MMCSD_CARD_RO    0x0200   /* card is read-only     */
  60
  61 #define TIFM_MMCSD_FIFO_SIZE  0x0020
  62
  63 #define TIFM_MMCSD_RSP_R0     0x0000
  64 #define TIFM_MMCSD_RSP_R1     0x0100
  65 #define TIFM_MMCSD_RSP_R2     0x0200
  66 #define TIFM_MMCSD_RSP_R3     0x0300
  67 #define TIFM_MMCSD_RSP_R4     0x0400
  68 #define TIFM_MMCSD_RSP_R5     0x0500
  69 #define TIFM_MMCSD_RSP_R6     0x0600
  70
  71 #define TIFM_MMCSD_RSP_BUSY   0x0800
  72
  73 #define TIFM_MMCSD_CMD_BC     0x0000
  74 #define TIFM_MMCSD_CMD_BCR    0x1000
  75 #define TIFM_MMCSD_CMD_AC     0x2000
  76 #define TIFM_MMCSD_CMD_ADTC   0x3000
  77
  78 #define TIFM_MMCSD_MAX_BLOCK_SIZE  0x0800UL
  79
  80 enum {
  81         CMD_READY    = 0x0001,
  82         FIFO_READY   = 0x0002,
  83         BRS_READY    = 0x0004,
  84         SCMD_ACTIVE  = 0x0008,
  85         SCMD_READY   = 0x0010,
  86         CARD_BUSY    = 0x0020,
  87         DATA_CARRY   = 0x0040
  88 };
  89
  90 struct tifm_sd {
  91         struct tifm_dev       *dev;
  92
  93         unsigned short        eject:1,
  94                               open_drain:1,
  95                               no_dma:1;
  96         unsigned short        cmd_flags;
  97
  98         unsigned int          clk_freq;
  99         unsigned int          clk_div;
 100         unsigned long         timeout_jiffies;
 101
 102         struct tasklet_struct finish_tasklet;
 103         struct timer_list     timer;
 104         struct mmc_request    *req;
 105
 106         int                   sg_len;
 107         int                   sg_pos;
 108         unsigned int          block_pos;
 109         struct scatterlist    bounce_buf;
 110         unsigned char         bounce_buf_data[TIFM_MMCSD_MAX_BLOCK_SIZE];
 111 };
 112
 113 /* for some reason, host won't respond correctly to readw/writew */
 114 static void tifm_sd_read_fifo(struct tifm_sd *host, struct page *pg,
 115                               unsigned int off, unsigned int cnt)
 116 {
 117         struct tifm_dev *sock = host->dev;
 118         unsigned char *buf;
 119         unsigned int pos = 0, val;
 120
 121         buf = kmap_atomic(pg) + off;
 122         if (host->cmd_flags & DATA_CARRY) {
 123                 buf[pos++] = host->bounce_buf_data[0];
 124                 host->cmd_flags &= ~DATA_CARRY;
 125         }
 126
 127         while (pos < cnt) {
 128                 val = readl(sock->addr + SOCK_MMCSD_DATA);
 129                 buf[pos++] = val & 0xff;
 130                 if (pos == cnt) {
 131                         host->bounce_buf_data[0] = (val >> 8) & 0xff;
 132                         host->cmd_flags |= DATA_CARRY;
 133                         break;
 134                 }
 135                 buf[pos++] = (val >> 8) & 0xff;
 136         }
 137         kunmap_atomic(buf - off);
 138 }
 139
 140 static void tifm_sd_write_fifo(struct tifm_sd *host, struct page *pg,
 141                                unsigned int off, unsigned int cnt)
 142 {
 143         struct tifm_dev *sock = host->dev;
 144         unsigned char *buf;
 145         unsigned int pos = 0, val;
 146
 147         buf = kmap_atomic(pg) + off;
 148         if (host->cmd_flags & DATA_CARRY) {
 149                 val = host->bounce_buf_data[0] | ((buf[pos++] << 8) & 0xff00);
 150                 writel(val, sock->addr + SOCK_MMCSD_DATA);
 151                 host->cmd_flags &= ~DATA_CARRY;
 152         }
 153
 154         while (pos < cnt) {
 155                 val = buf[pos++];
 156                 if (pos == cnt) {
 157                         host->bounce_buf_data[0] = val & 0xff;
 158                         host->cmd_flags |= DATA_CARRY;
 159                         break;
 160                 }
 161                 val |= (buf[pos++] << 8) & 0xff00;
 162                 writel(val, sock->addr + SOCK_MMCSD_DATA);
 163         }
 164         kunmap_atomic(buf - off);
 165 }
 166
 167 static void tifm_sd_transfer_data(struct tifm_sd *host)
 168 {
 169         struct mmc_data *r_data = host->req->cmd->data;
 170         struct scatterlist *sg = r_data->sg;
 171         unsigned int off, cnt, t_size = TIFM_MMCSD_FIFO_SIZE * 2;
 172         unsigned int p_off, p_cnt;
 173         struct page *pg;
 174
 175         if (host->sg_pos == host->sg_len)
 176                 return;
 177         while (t_size) {
 178                 cnt = sg[host->sg_pos].length - host->block_pos;
 179                 if (!cnt) {
 180                         host->block_pos = 0;
 181                         host->sg_pos++;
 182                         if (host->sg_pos == host->sg_len) {
 183                                 if ((r_data->flags & MMC_DATA_WRITE)
 184                                     && (host->cmd_flags & DATA_CARRY))
 185                                         writel(host->bounce_buf_data[0],
 186                                                host->dev->addr
 187                                                + SOCK_MMCSD_DATA);
 188
 189                                 return;
 190                         }
 191                         cnt = sg[host->sg_pos].length;
 192                 }
 193                 off = sg[host->sg_pos].offset + host->block_pos;
 194
 195                 pg = nth_page(sg_page(&sg[host->sg_pos]), off >> PAGE_SHIFT);
 196                 p_off = offset_in_page(off);
 197                 p_cnt = PAGE_SIZE - p_off;
 198                 p_cnt = min(p_cnt, cnt);
 199                 p_cnt = min(p_cnt, t_size);
 200
 201                 if (r_data->flags & MMC_DATA_READ)
 202                         tifm_sd_read_fifo(host, pg, p_off, p_cnt);
 203                 else if (r_data->flags & MMC_DATA_WRITE)
 204                         tifm_sd_write_fifo(host, pg, p_off, p_cnt);
 205
 206                 t_size -= p_cnt;
 207                 host->block_pos += p_cnt;
 208         }
 209 }
 210
 211 static void tifm_sd_copy_page(struct page *dst, unsigned int dst_off,
 212                               struct page *src, unsigned int src_off,
 213                               unsigned int count)
 214 {
 215         unsigned char *src_buf = kmap_atomic(src) + src_off;
 216         unsigned char *dst_buf = kmap_atomic(dst) + dst_off;
 217
 218         memcpy(dst_buf, src_buf, count);
 219
 220         kunmap_atomic(dst_buf - dst_off);
 221         kunmap_atomic(src_buf - src_off);
 222 }
 223
 224 static void tifm_sd_bounce_block(struct tifm_sd *host, struct mmc_data *r_data)
 225 {
 226         struct scatterlist *sg = r_data->sg;
 227         unsigned int t_size = r_data->blksz;
 228         unsigned int off, cnt;
 229         unsigned int p_off, p_cnt;
 230         struct page *pg;
 231
 232         dev_dbg(&host->dev->dev, "bouncing block\n");
 233         while (t_size) {
 234                 cnt = sg[host->sg_pos].length - host->block_pos;
 235                 if (!cnt) {
 236                         host->block_pos = 0;
 237                         host->sg_pos++;
 238                         if (host->sg_pos == host->sg_len)
 239                                 return;
 240                         cnt = sg[host->sg_pos].length;
 241                 }
 242                 off = sg[host->sg_pos].offset + host->block_pos;
 243
 244                 pg = nth_page(sg_page(&sg[host->sg_pos]), off >> PAGE_SHIFT);
 245                 p_off = offset_in_page(off);
 246                 p_cnt = PAGE_SIZE - p_off;
 247                 p_cnt = min(p_cnt, cnt);
 248                 p_cnt = min(p_cnt, t_size);
 249
 250                 if (r_data->flags & MMC_DATA_WRITE)
 251                         tifm_sd_copy_page(sg_page(&host->bounce_buf),
 252                                           r_data->blksz - t_size,
 253                                           pg, p_off, p_cnt);
 254                 else if (r_data->flags & MMC_DATA_READ)
 255                         tifm_sd_copy_page(pg, p_off, sg_page(&host->bounce_buf),
 256                                           r_data->blksz - t_size, p_cnt);
 257
 258                 t_size -= p_cnt;
 259                 host->block_pos += p_cnt;
 260         }
 261 }
 262
 263 static int tifm_sd_set_dma_data(struct tifm_sd *host, struct mmc_data *r_data)
 264 {
 265         struct tifm_dev *sock = host->dev;
 266         unsigned int t_size = TIFM_DMA_TSIZE * r_data->blksz;
 267         unsigned int dma_len, dma_blk_cnt, dma_off;
 268         struct scatterlist *sg = NULL;
 269         unsigned long flags;
 270
 271         if (host->sg_pos == host->sg_len)
 272                 return 1;
 273
 274         if (host->cmd_flags & DATA_CARRY) {
 275                 host->cmd_flags &= ~DATA_CARRY;
 276                 local_irq_save(flags);
 277                 tifm_sd_bounce_block(host, r_data);
 278                 local_irq_restore(flags);
 279                 if (host->sg_pos == host->sg_len)
 280                         return 1;
 281         }
 282
 283         dma_len = sg_dma_len(&r_data->sg[host->sg_pos]) - host->block_pos;
 284         if (!dma_len) {
 285                 host->block_pos = 0;
 286                 host->sg_pos++;
 287                 if (host->sg_pos == host->sg_len)
 288                         return 1;
 289                 dma_len = sg_dma_len(&r_data->sg[host->sg_pos]);
 290         }
 291
 292         if (dma_len < t_size) {
 293                 dma_blk_cnt = dma_len / r_data->blksz;
 294                 dma_off = host->block_pos;
 295                 host->block_pos += dma_blk_cnt * r_data->blksz;
 296         } else {
 297                 dma_blk_cnt = TIFM_DMA_TSIZE;
 298                 dma_off = host->block_pos;
 299                 host->block_pos += t_size;
 300         }
 301
 302         if (dma_blk_cnt)
 303                 sg = &r_data->sg[host->sg_pos];
 304         else if (dma_len) {
 305                 if (r_data->flags & MMC_DATA_WRITE) {
 306                         local_irq_save(flags);
 307                         tifm_sd_bounce_block(host, r_data);
 308                         local_irq_restore(flags);
 309                 } else
 310                         host->cmd_flags |= DATA_CARRY;
 311
 312                 sg = &host->bounce_buf;
 313                 dma_off = 0;
 314                 dma_blk_cnt = 1;
 315         } else
 316                 return 1;
 317
 318         dev_dbg(&sock->dev, "setting dma for %d blocks\n", dma_blk_cnt);
 319         writel(sg_dma_address(sg) + dma_off, sock->addr + SOCK_DMA_ADDRESS);
 320         if (r_data->flags & MMC_DATA_WRITE)
 321                 writel((dma_blk_cnt << 8) | TIFM_DMA_TX | TIFM_DMA_EN,
 322                        sock->addr + SOCK_DMA_CONTROL);
 323         else
 324                 writel((dma_blk_cnt << 8) | TIFM_DMA_EN,
 325                        sock->addr + SOCK_DMA_CONTROL);
 326
 327         return 0;
 328 }
 329
 330 static unsigned int tifm_sd_op_flags(struct mmc_command *cmd)
 331 {
 332         unsigned int rc = 0;
 333
 334         switch (mmc_resp_type(cmd)) {
 335         case MMC_RSP_NONE:
 336                 rc |= TIFM_MMCSD_RSP_R0;
 337                 break;
 338         case MMC_RSP_R1B:
 339                 rc |= TIFM_MMCSD_RSP_BUSY; // deliberate fall-through
 340         case MMC_RSP_R1:
 341                 rc |= TIFM_MMCSD_RSP_R1;
 342                 break;
 343         case MMC_RSP_R2:
 344                 rc |= TIFM_MMCSD_RSP_R2;
 345                 break;
 346         case MMC_RSP_R3:
 347                 rc |= TIFM_MMCSD_RSP_R3;
 348                 break;
 349         default:
 350                 BUG();
 351         }
 352
 353         switch (mmc_cmd_type(cmd)) {
 354         case MMC_CMD_BC:
 355                 rc |= TIFM_MMCSD_CMD_BC;
 356                 break;
 357         case MMC_CMD_BCR:
 358                 rc |= TIFM_MMCSD_CMD_BCR;
 359                 break;
 360         case MMC_CMD_AC:
 361                 rc |= TIFM_MMCSD_CMD_AC;
 362                 break;
 363         case MMC_CMD_ADTC:
 364                 rc |= TIFM_MMCSD_CMD_ADTC;
 365                 break;
 366         default:
 367                 BUG();
 368         }
 369         return rc;
 370 }
 371
 372 static void tifm_sd_exec(struct tifm_sd *host, struct mmc_command *cmd)
 373 {
 374         struct tifm_dev *sock = host->dev;
 375         unsigned int cmd_mask = tifm_sd_op_flags(cmd);
 376
 377         if (host->open_drain)
 378                 cmd_mask |= TIFM_MMCSD_ODTO;
 379
 380         if (cmd->data && (cmd->data->flags & MMC_DATA_READ))
 381                 cmd_mask |= TIFM_MMCSD_READ;
 382
 383         dev_dbg(&sock->dev, "executing opcode 0x%x, arg: 0x%x, mask: 0x%x\n",
 384                 cmd->opcode, cmd->arg, cmd_mask);
 385
 386         writel((cmd->arg >> 16) & 0xffff, sock->addr + SOCK_MMCSD_ARG_HIGH);
 387         writel(cmd->arg & 0xffff, sock->addr + SOCK_MMCSD_ARG_LOW);
 388         writel(cmd->opcode | cmd_mask, sock->addr + SOCK_MMCSD_COMMAND);
 389 }
 390
 391 static void tifm_sd_fetch_resp(struct mmc_command *cmd, struct tifm_dev *sock)
 392 {
 393         cmd->resp[0] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x1c) << 16)
 394                        | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x18);
 395         cmd->resp[1] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x14) << 16)
 396                        | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x10);
 397         cmd->resp[2] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x0c) << 16)
 398                        | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x08);
 399         cmd->resp[3] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x04) << 16)
 400                        | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x00);
 401 }
 402
 403 static void tifm_sd_check_status(struct tifm_sd *host)
 404 {
 405         struct tifm_dev *sock = host->dev;
 406         struct mmc_command *cmd = host->req->cmd;
 407
 408         if (cmd->error)
 409                 goto finish_request;
 410
 411         if (!(host->cmd_flags & CMD_READY))
 412                 return;
 413
 414         if (cmd->data) {
 415                 if (cmd->data->error) {
 416                         if ((host->cmd_flags & SCMD_ACTIVE)
 417                             && !(host->cmd_flags & SCMD_READY))
 418                                 return;
 419
 420                         goto finish_request;
 421                 }
 422
 423                 if (!(host->cmd_flags & BRS_READY))
 424                         return;
 425
 426                 if (!(host->no_dma || (host->cmd_flags & FIFO_READY)))
 427                         return;
 428
 429                 if (cmd->data->flags & MMC_DATA_WRITE) {
 430                         if (host->req->stop) {
 431                                 if (!(host->cmd_flags & SCMD_ACTIVE)) {
 432                                         host->cmd_flags |= SCMD_ACTIVE;
 433                                         writel(TIFM_MMCSD_EOFB
 434                                                | readl(sock->addr
 435                                                        + SOCK_MMCSD_INT_ENABLE),
 436                                                sock->addr
 437                                                + SOCK_MMCSD_INT_ENABLE);
 438                                         tifm_sd_exec(host, host->req->stop);
 439                                         return;
 440                                 } else {
 441                                         if (!(host->cmd_flags & SCMD_READY)
 442                                             || (host->cmd_flags & CARD_BUSY))
 443                                                 return;
 444                                         writel((~TIFM_MMCSD_EOFB)
 445                                                & readl(sock->addr
 446                                                        + SOCK_MMCSD_INT_ENABLE),
 447                                                sock->addr
 448                                                + SOCK_MMCSD_INT_ENABLE);
 449                                 }
 450                         } else {
 451                                 if (host->cmd_flags & CARD_BUSY)
 452                                         return;
 453                                 writel((~TIFM_MMCSD_EOFB)
 454                                        & readl(sock->addr
 455                                                + SOCK_MMCSD_INT_ENABLE),
 456                                        sock->addr + SOCK_MMCSD_INT_ENABLE);
 457                         }
 458                 } else {
 459                         if (host->req->stop) {
 460                                 if (!(host->cmd_flags & SCMD_ACTIVE)) {
 461                                         host->cmd_flags |= SCMD_ACTIVE;
 462                                         tifm_sd_exec(host, host->req->stop);
 463                                         return;
 464                                 } else {
 465                                         if (!(host->cmd_flags & SCMD_READY))
 466                                                 return;
 467                                 }
 468                         }
 469                 }
 470         }
 471 finish_request:
 472         tasklet_schedule(&host->finish_tasklet);
 473 }
 474
 475 /* Called from interrupt handler */
 476 static void tifm_sd_data_event(struct tifm_dev *sock)
 477 {
 478         struct tifm_sd *host;
 479         unsigned int fifo_status = 0;
 480         struct mmc_data *r_data = NULL;
 481
 482         spin_lock(&sock->lock);
 483         host = mmc_priv((struct mmc_host*)tifm_get_drvdata(sock));
 484         fifo_status = readl(sock->addr + SOCK_DMA_FIFO_STATUS);
 485         dev_dbg(&sock->dev, "data event: fifo_status %x, flags %x\n",
 486                 fifo_status, host->cmd_flags);
 487
 488         if (host->req) {
 489                 r_data = host->req->cmd->data;
 490
 491                 if (r_data && (fifo_status & TIFM_FIFO_READY)) {
 492                         if (tifm_sd_set_dma_data(host, r_data)) {
 493                                 host->cmd_flags |= FIFO_READY;
 494                                 tifm_sd_check_status(host);
 495                         }
 496                 }
 497         }
 498
 499         writel(fifo_status, sock->addr + SOCK_DMA_FIFO_STATUS);
 500         spin_unlock(&sock->lock);
 501 }
 502
 503 /* Called from interrupt handler */
 504 static void tifm_sd_card_event(struct tifm_dev *sock)
 505 {
 506         struct tifm_sd *host;
 507         unsigned int host_status = 0;
 508         int cmd_error = 0;
 509         struct mmc_command *cmd = NULL;
 510         unsigned long flags;
 511
 512         spin_lock(&sock->lock);
 513         host = mmc_priv((struct mmc_host*)tifm_get_drvdata(sock));
 514         host_status = readl(sock->addr + SOCK_MMCSD_STATUS);
 515         dev_dbg(&sock->dev, "host event: host_status %x, flags %x\n",
 516                 host_status, host->cmd_flags);
 517
 518         if (host->req) {
 519                 cmd = host->req->cmd;
 520
 521                 if (host_status & TIFM_MMCSD_ERRMASK) {
 522                         writel(host_status & TIFM_MMCSD_ERRMASK,
 523                                sock->addr + SOCK_MMCSD_STATUS);
 524                         if (host_status & TIFM_MMCSD_CTO)
 525                                 cmd_error = -ETIMEDOUT;
 526                         else if (host_status & TIFM_MMCSD_CCRC)
 527                                 cmd_error = -EILSEQ;
 528
 529                         if (cmd->data) {
 530                                 if (host_status & TIFM_MMCSD_DTO)
 531                                         cmd->data->error = -ETIMEDOUT;
 532                                 else if (host_status & TIFM_MMCSD_DCRC)
 533                                         cmd->data->error = -EILSEQ;
 534                         }
 535
 536                         writel(TIFM_FIFO_INT_SETALL,
 537                                sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
 538                         writel(TIFM_DMA_RESET, sock->addr + SOCK_DMA_CONTROL);
 539
 540                         if (host->req->stop) {
 541                                 if (host->cmd_flags & SCMD_ACTIVE) {
 542                                         host->req->stop->error = cmd_error;
 543                                         host->cmd_flags |= SCMD_READY;
 544                                 } else {
 545                                         cmd->error = cmd_error;
 546                                         host->cmd_flags |= SCMD_ACTIVE;
 547                                         tifm_sd_exec(host, host->req->stop);
 548                                         goto done;
 549                                 }
 550                         } else
 551                                 cmd->error = cmd_error;
 552                 } else {
 553                         if (host_status & (TIFM_MMCSD_EOC | TIFM_MMCSD_CERR)) {
 554                                 if (!(host->cmd_flags & CMD_READY)) {
 555                                         host->cmd_flags |= CMD_READY;
 556                                         tifm_sd_fetch_resp(cmd, sock);
 557                                 } else if (host->cmd_flags & SCMD_ACTIVE) {
 558                                         host->cmd_flags |= SCMD_READY;
 559                                         tifm_sd_fetch_resp(host->req->stop,
 560                                                            sock);
 561                                 }
 562                         }
 563                         if (host_status & TIFM_MMCSD_BRS)
 564                                 host->cmd_flags |= BRS_READY;
 565                 }
 566
 567                 if (host->no_dma && cmd->data) {
 568                         if (host_status & TIFM_MMCSD_AE)
 569                                 writel(host_status & TIFM_MMCSD_AE,
 570                                        sock->addr + SOCK_MMCSD_STATUS);
 571
 572                         if (host_status & (TIFM_MMCSD_AE | TIFM_MMCSD_AF
 573                                            | TIFM_MMCSD_BRS)) {
 574                                 local_irq_save(flags);
 575                                 tifm_sd_transfer_data(host);
 576                                 local_irq_restore(flags);
 577                                 host_status &= ~TIFM_MMCSD_AE;
 578                         }
 579                 }
 580
 581                 if (host_status & TIFM_MMCSD_EOFB)
 582                         host->cmd_flags &= ~CARD_BUSY;
 583                 else if (host_status & TIFM_MMCSD_CB)
 584                         host->cmd_flags |= CARD_BUSY;
 585
 586                 tifm_sd_check_status(host);
 587         }
 588 done:
 589         writel(host_status, sock->addr + SOCK_MMCSD_STATUS);
 590         spin_unlock(&sock->lock);
 591 }
 592
 593 static void tifm_sd_set_data_timeout(struct tifm_sd *host,
 594                                      struct mmc_data *data)
 595 {
 596         struct tifm_dev *sock = host->dev;
 597         unsigned int data_timeout = data->timeout_clks;
 598
 599         if (fixed_timeout)
 600                 return;
 601
 602         data_timeout += data->timeout_ns /
 603                         ((1000000000UL / host->clk_freq) * host->clk_div);
 604
 605         if (data_timeout < 0xffff) {
 606                 writel(data_timeout, sock->addr + SOCK_MMCSD_DATA_TO);
 607                 writel((~TIFM_MMCSD_DPE)
 608                        & readl(sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG),
 609                        sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG);
 610         } else {
 611                 data_timeout = (data_timeout >> 10) + 1;
 612                 if (data_timeout > 0xffff)
 613                         data_timeout = 0;       /* set to unlimited */
 614                 writel(data_timeout, sock->addr + SOCK_MMCSD_DATA_TO);
 615                 writel(TIFM_MMCSD_DPE
 616                        | readl(sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG),
 617                        sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG);
 618         }
 619 }
 620
 621 static void tifm_sd_request(struct mmc_host *mmc, struct mmc_request *mrq)
 622 {
 623         struct tifm_sd *host = mmc_priv(mmc);
 624         struct tifm_dev *sock = host->dev;
 625         unsigned long flags;
 626         struct mmc_data *r_data = mrq->cmd->data;
 627
 628         spin_lock_irqsave(&sock->lock, flags);
 629         if (host->eject) {
 630                 mrq->cmd->error = -ENOMEDIUM;
 631                 goto err_out;
 632         }
 633
 634         if (host->req) {
 635                 pr_err("%s : unfinished request detected\n",
 636                        dev_name(&sock->dev));
 637                 mrq->cmd->error = -ETIMEDOUT;
 638                 goto err_out;
 639         }
 640
 641         host->cmd_flags = 0;
 642         host->block_pos = 0;
 643         host->sg_pos = 0;
 644
 645         if (mrq->data && !is_power_of_2(mrq->data->blksz))
 646                 host->no_dma = 1;
 647         else
 648                 host->no_dma = no_dma ? 1 : 0;
 649
 650         if (r_data) {
 651                 tifm_sd_set_data_timeout(host, r_data);
 652
 653                 if ((r_data->flags & MMC_DATA_WRITE) && !mrq->stop)
 654                          writel(TIFM_MMCSD_EOFB
 655                                 | readl(sock->addr + SOCK_MMCSD_INT_ENABLE),
 656                                 sock->addr + SOCK_MMCSD_INT_ENABLE);
 657
 658                 if (host->no_dma) {
 659                         writel(TIFM_MMCSD_BUFINT
 660                                | readl(sock->addr + SOCK_MMCSD_INT_ENABLE),
 661                                sock->addr + SOCK_MMCSD_INT_ENABLE);
 662                         writel(((TIFM_MMCSD_FIFO_SIZE - 1) << 8)
 663                                | (TIFM_MMCSD_FIFO_SIZE - 1),
 664                                sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
 665
 666                         host->sg_len = r_data->sg_len;
 667                 } else {
 668                         sg_init_one(&host->bounce_buf, host->bounce_buf_data,
 669                                     r_data->blksz);
 670
 671                         if(1 != tifm_map_sg(sock, &host->bounce_buf, 1,
 672                                             r_data->flags & MMC_DATA_WRITE
 673                                             ? PCI_DMA_TODEVICE
 674                                             : PCI_DMA_FROMDEVICE)) {
 675                                 pr_err("%s : scatterlist map failed\n",
 676                                        dev_name(&sock->dev));
 677                                 mrq->cmd->error = -ENOMEM;
 678                                 goto err_out;
 679                         }
 680                         host->sg_len = tifm_map_sg(sock, r_data->sg,
 681                                                    r_data->sg_len,
 682                                                    r_data->flags
 683                                                    & MMC_DATA_WRITE
 684                                                    ? PCI_DMA_TODEVICE
 685                                                    : PCI_DMA_FROMDEVICE);
 686                         if (host->sg_len < 1) {
 687                                 pr_err("%s : scatterlist map failed\n",
 688                                        dev_name(&sock->dev));
 689                                 tifm_unmap_sg(sock, &host->bounce_buf, 1,
 690                                               r_data->flags & MMC_DATA_WRITE
 691                                               ? PCI_DMA_TODEVICE
 692                                               : PCI_DMA_FROMDEVICE);
 693                                 mrq->cmd->error = -ENOMEM;
 694                                 goto err_out;
 695                         }
 696
 697                         writel(TIFM_FIFO_INT_SETALL,
 698                                sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
 699                         writel(ilog2(r_data->blksz) - 2,
 700                                sock->addr + SOCK_FIFO_PAGE_SIZE);
 701                         writel(TIFM_FIFO_ENABLE,
 702                                sock->addr + SOCK_FIFO_CONTROL);
 703                         writel(TIFM_FIFO_INTMASK,
 704                                sock->addr + SOCK_DMA_FIFO_INT_ENABLE_SET);
 705
 706                         if (r_data->flags & MMC_DATA_WRITE)
 707                                 writel(TIFM_MMCSD_TXDE,
 708                                        sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
 709                         else
 710                                 writel(TIFM_MMCSD_RXDE,
 711                                        sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
 712
 713                         tifm_sd_set_dma_data(host, r_data);
 714                 }
 715
 716                 writel(r_data->blocks - 1,
 717                        sock->addr + SOCK_MMCSD_NUM_BLOCKS);
 718                 writel(r_data->blksz - 1,
 719                        sock->addr + SOCK_MMCSD_BLOCK_LEN);
 720         }
 721
 722         host->req = mrq;
 723         mod_timer(&host->timer, jiffies + host->timeout_jiffies);
 724         writel(TIFM_CTRL_LED | readl(sock->addr + SOCK_CONTROL),
 725                sock->addr + SOCK_CONTROL);
 726         tifm_sd_exec(host, mrq->cmd);
 727         spin_unlock_irqrestore(&sock->lock, flags);
 728         return;
 729
 730 err_out:
 731         spin_unlock_irqrestore(&sock->lock, flags);
 732         mmc_request_done(mmc, mrq);
 733 }
 734
 735 static void tifm_sd_end_cmd(unsigned long data)
 736 {
 737         struct tifm_sd *host = (struct tifm_sd*)data;
 738         struct tifm_dev *sock = host->dev;
 739         struct mmc_host *mmc = tifm_get_drvdata(sock);
 740         struct mmc_request *mrq;
 741         struct mmc_data *r_data = NULL;
 742         unsigned long flags;
 743
 744         spin_lock_irqsave(&sock->lock, flags);
 745
 746         del_timer(&host->timer);
 747         mrq = host->req;
 748         host->req = NULL;
 749
 750         if (!mrq) {
 751                 pr_err(" %s : no request to complete?\n",
 752                        dev_name(&sock->dev));
 753                 spin_unlock_irqrestore(&sock->lock, flags);
 754                 return;
 755         }
 756
 757         r_data = mrq->cmd->data;
 758         if (r_data) {
 759                 if (host->no_dma) {
 760                         writel((~TIFM_MMCSD_BUFINT)
 761                                & readl(sock->addr + SOCK_MMCSD_INT_ENABLE),
 762                                sock->addr + SOCK_MMCSD_INT_ENABLE);
 763                 } else {
 764                         tifm_unmap_sg(sock, &host->bounce_buf, 1,
 765                                       (r_data->flags & MMC_DATA_WRITE)
 766                                       ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
 767                         tifm_unmap_sg(sock, r_data->sg, r_data->sg_len,
 768                                       (r_data->flags & MMC_DATA_WRITE)
 769                                       ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
 770                 }
 771
 772                 r_data->bytes_xfered = r_data->blocks
 773                         - readl(sock->addr + SOCK_MMCSD_NUM_BLOCKS) - 1;
 774                 r_data->bytes_xfered *= r_data->blksz;
 775                 r_data->bytes_xfered += r_data->blksz
 776                         - readl(sock->addr + SOCK_MMCSD_BLOCK_LEN) + 1;
 777         }
 778
 779         writel((~TIFM_CTRL_LED) & readl(sock->addr + SOCK_CONTROL),
 780                sock->addr + SOCK_CONTROL);
 781
 782         spin_unlock_irqrestore(&sock->lock, flags);
 783         mmc_request_done(mmc, mrq);
 784 }
 785
 786 static void tifm_sd_abort(unsigned long data)
 787 {
 788         struct tifm_sd *host = (struct tifm_sd*)data;
 789
 790         pr_err("%s : card failed to respond for a long period of time "
 791                "(%x, %x)\n",
 792                dev_name(&host->dev->dev), host->req->cmd->opcode, host->cmd_flags);
 793
 794         tifm_eject(host->dev);
 795 }
 796
 797 static void tifm_sd_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 798 {
 799         struct tifm_sd *host = mmc_priv(mmc);
 800         struct tifm_dev *sock = host->dev;
 801         unsigned int clk_div1, clk_div2;
 802         unsigned long flags;
 803
 804         spin_lock_irqsave(&sock->lock, flags);
 805
 806         dev_dbg(&sock->dev, "ios: clock = %u, vdd = %x, bus_mode = %x, "
 807                 "chip_select = %x, power_mode = %x, bus_width = %x\n",
 808                 ios->clock, ios->vdd, ios->bus_mode, ios->chip_select,
 809                 ios->power_mode, ios->bus_width);
 810
 811         if (ios->bus_width == MMC_BUS_WIDTH_4) {
 812                 writel(TIFM_MMCSD_4BBUS | readl(sock->addr + SOCK_MMCSD_CONFIG),
 813                        sock->addr + SOCK_MMCSD_CONFIG);
 814         } else {
 815                 writel((~TIFM_MMCSD_4BBUS)
 816                        & readl(sock->addr + SOCK_MMCSD_CONFIG),
 817                        sock->addr + SOCK_MMCSD_CONFIG);
 818         }
 819
 820         if (ios->clock) {
 821                 clk_div1 = 20000000 / ios->clock;
 822                 if (!clk_div1)
 823                         clk_div1 = 1;
 824
 825                 clk_div2 = 24000000 / ios->clock;
 826                 if (!clk_div2)
 827                         clk_div2 = 1;
 828
 829                 if ((20000000 / clk_div1) > ios->clock)
 830                         clk_div1++;
 831                 if ((24000000 / clk_div2) > ios->clock)
 832                         clk_div2++;
 833                 if ((20000000 / clk_div1) > (24000000 / clk_div2)) {
 834                         host->clk_freq = 20000000;
 835                         host->clk_div = clk_div1;
 836                         writel((~TIFM_CTRL_FAST_CLK)
 837                                & readl(sock->addr + SOCK_CONTROL),
 838                                sock->addr + SOCK_CONTROL);
 839                 } else {
 840                         host->clk_freq = 24000000;
 841                         host->clk_div = clk_div2;
 842                         writel(TIFM_CTRL_FAST_CLK
 843                                | readl(sock->addr + SOCK_CONTROL),
 844                                sock->addr + SOCK_CONTROL);
 845                 }
 846         } else {
 847                 host->clk_div = 0;
 848         }
 849         host->clk_div &= TIFM_MMCSD_CLKMASK;
 850         writel(host->clk_div
 851                | ((~TIFM_MMCSD_CLKMASK)
 852                   & readl(sock->addr + SOCK_MMCSD_CONFIG)),
 853                sock->addr + SOCK_MMCSD_CONFIG);
 854
 855         host->open_drain = (ios->bus_mode == MMC_BUSMODE_OPENDRAIN);
 856
 857         /* chip_select : maybe later */
 858         //vdd
 859         //power is set before probe / after remove
 860
 861         spin_unlock_irqrestore(&sock->lock, flags);
 862 }
 863
 864 static int tifm_sd_ro(struct mmc_host *mmc)
 865 {
 866         int rc = 0;
 867         struct tifm_sd *host = mmc_priv(mmc);
 868         struct tifm_dev *sock = host->dev;
 869         unsigned long flags;
 870
 871         spin_lock_irqsave(&sock->lock, flags);
 872         if (TIFM_MMCSD_CARD_RO & readl(sock->addr + SOCK_PRESENT_STATE))
 873                 rc = 1;
 874         spin_unlock_irqrestore(&sock->lock, flags);
 875         return rc;
 876 }
 877
 878 static const struct mmc_host_ops tifm_sd_ops = {
 879         .request = tifm_sd_request,
 880         .set_ios = tifm_sd_ios,
 881         .get_ro  = tifm_sd_ro
 882 };
 883
 884 static int tifm_sd_initialize_host(struct tifm_sd *host)
 885 {
 886         int rc;
 887         unsigned int host_status = 0;
 888         struct tifm_dev *sock = host->dev;
 889
 890         writel(0, sock->addr + SOCK_MMCSD_INT_ENABLE);
 891         mmiowb();
 892         host->clk_div = 61;
 893         host->clk_freq = 20000000;
 894         writel(TIFM_MMCSD_RESET, sock->addr + SOCK_MMCSD_SYSTEM_CONTROL);
 895         writel(host->clk_div | TIFM_MMCSD_POWER,
 896                sock->addr + SOCK_MMCSD_CONFIG);
 897
 898         /* wait up to 0.51 sec for reset */
 899         for (rc = 32; rc <= 256; rc <<= 1) {
 900                 if (1 & readl(sock->addr + SOCK_MMCSD_SYSTEM_STATUS)) {
 901                         rc = 0;
 902                         break;
 903                 }
 904                 msleep(rc);
 905         }
 906
 907         if (rc) {
 908                 pr_err("%s : controller failed to reset\n",
 909                        dev_name(&sock->dev));
 910                 return -ENODEV;
 911         }
 912
 913         writel(0, sock->addr + SOCK_MMCSD_NUM_BLOCKS);
 914         writel(host->clk_div | TIFM_MMCSD_POWER,
 915                sock->addr + SOCK_MMCSD_CONFIG);
 916         writel(TIFM_MMCSD_RXDE, sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
 917
 918         // command timeout fixed to 64 clocks for now
 919         writel(64, sock->addr + SOCK_MMCSD_COMMAND_TO);
 920         writel(TIFM_MMCSD_INAB, sock->addr + SOCK_MMCSD_COMMAND);
 921
 922         for (rc = 16; rc <= 64; rc <<= 1) {
 923                 host_status = readl(sock->addr + SOCK_MMCSD_STATUS);
 924                 writel(host_status, sock->addr + SOCK_MMCSD_STATUS);
 925                 if (!(host_status & TIFM_MMCSD_ERRMASK)
 926                     && (host_status & TIFM_MMCSD_EOC)) {
 927                         rc = 0;
 928                         break;
 929                 }
 930                 msleep(rc);
 931         }
 932
 933         if (rc) {
 934                 pr_err("%s : card not ready - probe failed on initialization\n",
 935                        dev_name(&sock->dev));
 936                 return -ENODEV;
 937         }
 938
 939         writel(TIFM_MMCSD_CERR | TIFM_MMCSD_BRS | TIFM_MMCSD_EOC
 940                | TIFM_MMCSD_ERRMASK,
 941                sock->addr + SOCK_MMCSD_INT_ENABLE);
 942         mmiowb();
 943
 944         return 0;
 945 }
 946
 947 static int tifm_sd_probe(struct tifm_dev *sock)
 948 {
 949         struct mmc_host *mmc;
 950         struct tifm_sd *host;
 951         int rc = -EIO;
 952
 953         if (!(TIFM_SOCK_STATE_OCCUPIED
 954               & readl(sock->addr + SOCK_PRESENT_STATE))) {
 955                 pr_warn("%s : card gone, unexpectedly\n",
 956                         dev_name(&sock->dev));
 957                 return rc;
 958         }
 959
 960         mmc = mmc_alloc_host(sizeof(struct tifm_sd), &sock->dev);
 961         if (!mmc)
 962                 return -ENOMEM;
 963
 964         host = mmc_priv(mmc);
 965         tifm_set_drvdata(sock, mmc);
 966         host->dev = sock;
 967         host->timeout_jiffies = msecs_to_jiffies(1000);
 968
 969         tasklet_init(&host->finish_tasklet, tifm_sd_end_cmd,
 970                      (unsigned long)host);
 971         setup_timer(&host->timer, tifm_sd_abort, (unsigned long)host);
 972
 973         mmc->ops = &tifm_sd_ops;
 974         mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
 975         mmc->caps = MMC_CAP_4_BIT_DATA;
 976         mmc->f_min = 20000000 / 60;
 977         mmc->f_max = 24000000;
 978
 979         mmc->max_blk_count = 2048;
 980         mmc->max_segs = mmc->max_blk_count;
 981         mmc->max_blk_size = min(TIFM_MMCSD_MAX_BLOCK_SIZE, PAGE_SIZE);
 982         mmc->max_seg_size = mmc->max_blk_count * mmc->max_blk_size;
 983         mmc->max_req_size = mmc->max_seg_size;
 984
 985         sock->card_event = tifm_sd_card_event;
 986         sock->data_event = tifm_sd_data_event;
 987         rc = tifm_sd_initialize_host(host);
 988
 989         if (!rc)
 990                 rc = mmc_add_host(mmc);
 991         if (!rc)
 992                 return 0;
 993
 994         mmc_free_host(mmc);
 995         return rc;
 996 }
 997
 998 static void tifm_sd_remove(struct tifm_dev *sock)
 999 {
1000         struct mmc_host *mmc = tifm_get_drvdata(sock);
1001         struct tifm_sd *host = mmc_priv(mmc);
1002         unsigned long flags;
1003
1004         spin_lock_irqsave(&sock->lock, flags);
1005         host->eject = 1;
1006         writel(0, sock->addr + SOCK_MMCSD_INT_ENABLE);
1007         mmiowb();
1008         spin_unlock_irqrestore(&sock->lock, flags);
1009
1010         tasklet_kill(&host->finish_tasklet);
1011
1012         spin_lock_irqsave(&sock->lock, flags);
1013         if (host->req) {
1014                 writel(TIFM_FIFO_INT_SETALL,
1015                        sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
1016                 writel(0, sock->addr + SOCK_DMA_FIFO_INT_ENABLE_SET);
1017                 host->req->cmd->error = -ENOMEDIUM;
1018                 if (host->req->stop)
1019                         host->req->stop->error = -ENOMEDIUM;
1020                 tasklet_schedule(&host->finish_tasklet);
1021         }
1022         spin_unlock_irqrestore(&sock->lock, flags);
1023         mmc_remove_host(mmc);
1024         dev_dbg(&sock->dev, "after remove\n");
1025
1026         mmc_free_host(mmc);
1027 }
1028
1029 #ifdef CONFIG_PM
1030
1031 static int tifm_sd_suspend(struct tifm_dev *sock, pm_message_t state)
1032 {
1033         return 0;
1034 }
1035
1036 static int tifm_sd_resume(struct tifm_dev *sock)
1037 {
1038         struct mmc_host *mmc = tifm_get_drvdata(sock);
1039         struct tifm_sd *host = mmc_priv(mmc);
1040         int rc;
1041
1042         rc = tifm_sd_initialize_host(host);
1043         dev_dbg(&sock->dev, "resume initialize %d\n", rc);
1044
1045         if (rc)
1046                 host->eject = 1;
1047
1048         return rc;
1049 }
1050
1051 #else
1052
1053 #define tifm_sd_suspend NULL
1054 #define tifm_sd_resume NULL
1055
1056 #endif /* CONFIG_PM */
1057
1058 static struct tifm_device_id tifm_sd_id_tbl[] = {
1059         { TIFM_TYPE_SD }, { }
1060 };
1061
1062 static struct tifm_driver tifm_sd_driver = {
1063         .driver = {
1064                 .name  = DRIVER_NAME,
1065                 .owner = THIS_MODULE
1066         },
1067         .id_table = tifm_sd_id_tbl,
1068         .probe    = tifm_sd_probe,
1069         .remove   = tifm_sd_remove,
1070         .suspend  = tifm_sd_suspend,
1071         .resume   = tifm_sd_resume
1072 };
1073
1074 static int __init tifm_sd_init(void)
1075 {
1076         return tifm_register_driver(&tifm_sd_driver);
1077 }
1078
1079 static void __exit tifm_sd_exit(void)
1080 {
1081         tifm_unregister_driver(&tifm_sd_driver);
1082 }
1083
1084 MODULE_AUTHOR("Alex Dubov");
1085 MODULE_DESCRIPTION("TI FlashMedia SD driver");
1086 MODULE_LICENSE("GPL");
1087 MODULE_DEVICE_TABLE(tifm, tifm_sd_id_tbl);
1088 MODULE_VERSION(DRIVER_VERSION);
1089
1090 module_init(tifm_sd_init);
1091 module_exit(tifm_sd_exit);