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;
 340                 /* fall-through */
 341         case MMC_RSP_R1:
 342                 rc |= TIFM_MMCSD_RSP_R1;
 343                 break;
 344         case MMC_RSP_R2:
 345                 rc |= TIFM_MMCSD_RSP_R2;
 346                 break;
 347         case MMC_RSP_R3:
 348                 rc |= TIFM_MMCSD_RSP_R3;
 349                 break;
 350         default:
 351                 BUG();
 352         }
 353
 354         switch (mmc_cmd_type(cmd)) {
 355         case MMC_CMD_BC:
 356                 rc |= TIFM_MMCSD_CMD_BC;
 357                 break;
 358         case MMC_CMD_BCR:
 359                 rc |= TIFM_MMCSD_CMD_BCR;
 360                 break;
 361         case MMC_CMD_AC:
 362                 rc |= TIFM_MMCSD_CMD_AC;
 363                 break;
 364         case MMC_CMD_ADTC:
 365                 rc |= TIFM_MMCSD_CMD_ADTC;
 366                 break;
 367         default:
 368                 BUG();
 369         }
 370         return rc;
 371 }
 372
 373 static void tifm_sd_exec(struct tifm_sd *host, struct mmc_command *cmd)
 374 {
 375         struct tifm_dev *sock = host->dev;
 376         unsigned int cmd_mask = tifm_sd_op_flags(cmd);
 377
 378         if (host->open_drain)
 379                 cmd_mask |= TIFM_MMCSD_ODTO;
 380
 381         if (cmd->data && (cmd->data->flags & MMC_DATA_READ))
 382                 cmd_mask |= TIFM_MMCSD_READ;
 383
 384         dev_dbg(&sock->dev, "executing opcode 0x%x, arg: 0x%x, mask: 0x%x\n",
 385                 cmd->opcode, cmd->arg, cmd_mask);
 386
 387         writel((cmd->arg >> 16) & 0xffff, sock->addr + SOCK_MMCSD_ARG_HIGH);
 388         writel(cmd->arg & 0xffff, sock->addr + SOCK_MMCSD_ARG_LOW);
 389         writel(cmd->opcode | cmd_mask, sock->addr + SOCK_MMCSD_COMMAND);
 390 }
 391
 392 static void tifm_sd_fetch_resp(struct mmc_command *cmd, struct tifm_dev *sock)
 393 {
 394         cmd->resp[0] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x1c) << 16)
 395                        | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x18);
 396         cmd->resp[1] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x14) << 16)
 397                        | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x10);
 398         cmd->resp[2] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x0c) << 16)
 399                        | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x08);
 400         cmd->resp[3] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x04) << 16)
 401                        | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x00);
 402 }
 403
 404 static void tifm_sd_check_status(struct tifm_sd *host)
 405 {
 406         struct tifm_dev *sock = host->dev;
 407         struct mmc_command *cmd = host->req->cmd;
 408
 409         if (cmd->error)
 410                 goto finish_request;
 411
 412         if (!(host->cmd_flags & CMD_READY))
 413                 return;
 414
 415         if (cmd->data) {
 416                 if (cmd->data->error) {
 417                         if ((host->cmd_flags & SCMD_ACTIVE)
 418                             && !(host->cmd_flags & SCMD_READY))
 419                                 return;
 420
 421                         goto finish_request;
 422                 }
 423
 424                 if (!(host->cmd_flags & BRS_READY))
 425                         return;
 426
 427                 if (!(host->no_dma || (host->cmd_flags & FIFO_READY)))
 428                         return;
 429
 430                 if (cmd->data->flags & MMC_DATA_WRITE) {
 431                         if (host->req->stop) {
 432                                 if (!(host->cmd_flags & SCMD_ACTIVE)) {
 433                                         host->cmd_flags |= SCMD_ACTIVE;
 434                                         writel(TIFM_MMCSD_EOFB
 435                                                | readl(sock->addr
 436                                                        + SOCK_MMCSD_INT_ENABLE),
 437                                                sock->addr
 438                                                + SOCK_MMCSD_INT_ENABLE);
 439                                         tifm_sd_exec(host, host->req->stop);
 440                                         return;
 441                                 } else {
 442                                         if (!(host->cmd_flags & SCMD_READY)
 443                                             || (host->cmd_flags & CARD_BUSY))
 444                                                 return;
 445                                         writel((~TIFM_MMCSD_EOFB)
 446                                                & readl(sock->addr
 447                                                        + SOCK_MMCSD_INT_ENABLE),
 448                                                sock->addr
 449                                                + SOCK_MMCSD_INT_ENABLE);
 450                                 }
 451                         } else {
 452                                 if (host->cmd_flags & CARD_BUSY)
 453                                         return;
 454                                 writel((~TIFM_MMCSD_EOFB)
 455                                        & readl(sock->addr
 456                                                + SOCK_MMCSD_INT_ENABLE),
 457                                        sock->addr + SOCK_MMCSD_INT_ENABLE);
 458                         }
 459                 } else {
 460                         if (host->req->stop) {
 461                                 if (!(host->cmd_flags & SCMD_ACTIVE)) {
 462                                         host->cmd_flags |= SCMD_ACTIVE;
 463                                         tifm_sd_exec(host, host->req->stop);
 464                                         return;
 465                                 } else {
 466                                         if (!(host->cmd_flags & SCMD_READY))
 467                                                 return;
 468                                 }
 469                         }
 470                 }
 471         }
 472 finish_request:
 473         tasklet_schedule(&host->finish_tasklet);
 474 }
 475
 476 /* Called from interrupt handler */
 477 static void tifm_sd_data_event(struct tifm_dev *sock)
 478 {
 479         struct tifm_sd *host;
 480         unsigned int fifo_status = 0;
 481         struct mmc_data *r_data = NULL;
 482
 483         spin_lock(&sock->lock);
 484         host = mmc_priv((struct mmc_host*)tifm_get_drvdata(sock));
 485         fifo_status = readl(sock->addr + SOCK_DMA_FIFO_STATUS);
 486         dev_dbg(&sock->dev, "data event: fifo_status %x, flags %x\n",
 487                 fifo_status, host->cmd_flags);
 488
 489         if (host->req) {
 490                 r_data = host->req->cmd->data;
 491
 492                 if (r_data && (fifo_status & TIFM_FIFO_READY)) {
 493                         if (tifm_sd_set_dma_data(host, r_data)) {
 494                                 host->cmd_flags |= FIFO_READY;
 495                                 tifm_sd_check_status(host);
 496                         }
 497                 }
 498         }
 499
 500         writel(fifo_status, sock->addr + SOCK_DMA_FIFO_STATUS);
 501         spin_unlock(&sock->lock);
 502 }
 503
 504 /* Called from interrupt handler */
 505 static void tifm_sd_card_event(struct tifm_dev *sock)
 506 {
 507         struct tifm_sd *host;
 508         unsigned int host_status = 0;
 509         int cmd_error = 0;
 510         struct mmc_command *cmd = NULL;
 511         unsigned long flags;
 512
 513         spin_lock(&sock->lock);
 514         host = mmc_priv((struct mmc_host*)tifm_get_drvdata(sock));
 515         host_status = readl(sock->addr + SOCK_MMCSD_STATUS);
 516         dev_dbg(&sock->dev, "host event: host_status %x, flags %x\n",
 517                 host_status, host->cmd_flags);
 518
 519         if (host->req) {
 520                 cmd = host->req->cmd;
 521
 522                 if (host_status & TIFM_MMCSD_ERRMASK) {
 523                         writel(host_status & TIFM_MMCSD_ERRMASK,
 524                                sock->addr + SOCK_MMCSD_STATUS);
 525                         if (host_status & TIFM_MMCSD_CTO)
 526                                 cmd_error = -ETIMEDOUT;
 527                         else if (host_status & TIFM_MMCSD_CCRC)
 528                                 cmd_error = -EILSEQ;
 529
 530                         if (cmd->data) {
 531                                 if (host_status & TIFM_MMCSD_DTO)
 532                                         cmd->data->error = -ETIMEDOUT;
 533                                 else if (host_status & TIFM_MMCSD_DCRC)
 534                                         cmd->data->error = -EILSEQ;
 535                         }
 536
 537                         writel(TIFM_FIFO_INT_SETALL,
 538                                sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
 539                         writel(TIFM_DMA_RESET, sock->addr + SOCK_DMA_CONTROL);
 540
 541                         if (host->req->stop) {
 542                                 if (host->cmd_flags & SCMD_ACTIVE) {
 543                                         host->req->stop->error = cmd_error;
 544                                         host->cmd_flags |= SCMD_READY;
 545                                 } else {
 546                                         cmd->error = cmd_error;
 547                                         host->cmd_flags |= SCMD_ACTIVE;
 548                                         tifm_sd_exec(host, host->req->stop);
 549                                         goto done;
 550                                 }
 551                         } else
 552                                 cmd->error = cmd_error;
 553                 } else {
 554                         if (host_status & (TIFM_MMCSD_EOC | TIFM_MMCSD_CERR)) {
 555                                 if (!(host->cmd_flags & CMD_READY)) {
 556                                         host->cmd_flags |= CMD_READY;
 557                                         tifm_sd_fetch_resp(cmd, sock);
 558                                 } else if (host->cmd_flags & SCMD_ACTIVE) {
 559                                         host->cmd_flags |= SCMD_READY;
 560                                         tifm_sd_fetch_resp(host->req->stop,
 561                                                            sock);
 562                                 }
 563                         }
 564                         if (host_status & TIFM_MMCSD_BRS)
 565                                 host->cmd_flags |= BRS_READY;
 566                 }
 567
 568                 if (host->no_dma && cmd->data) {
 569                         if (host_status & TIFM_MMCSD_AE)
 570                                 writel(host_status & TIFM_MMCSD_AE,
 571                                        sock->addr + SOCK_MMCSD_STATUS);
 572
 573                         if (host_status & (TIFM_MMCSD_AE | TIFM_MMCSD_AF
 574                                            | TIFM_MMCSD_BRS)) {
 575                                 local_irq_save(flags);
 576                                 tifm_sd_transfer_data(host);
 577                                 local_irq_restore(flags);
 578                                 host_status &= ~TIFM_MMCSD_AE;
 579                         }
 580                 }
 581
 582                 if (host_status & TIFM_MMCSD_EOFB)
 583                         host->cmd_flags &= ~CARD_BUSY;
 584                 else if (host_status & TIFM_MMCSD_CB)
 585                         host->cmd_flags |= CARD_BUSY;
 586
 587                 tifm_sd_check_status(host);
 588         }
 589 done:
 590         writel(host_status, sock->addr + SOCK_MMCSD_STATUS);
 591         spin_unlock(&sock->lock);
 592 }
 593
 594 static void tifm_sd_set_data_timeout(struct tifm_sd *host,
 595                                      struct mmc_data *data)
 596 {
 597         struct tifm_dev *sock = host->dev;
 598         unsigned int data_timeout = data->timeout_clks;
 599
 600         if (fixed_timeout)
 601                 return;
 602
 603         data_timeout += data->timeout_ns /
 604                         ((1000000000UL / host->clk_freq) * host->clk_div);
 605
 606         if (data_timeout < 0xffff) {
 607                 writel(data_timeout, sock->addr + SOCK_MMCSD_DATA_TO);
 608                 writel((~TIFM_MMCSD_DPE)
 609                        & readl(sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG),
 610                        sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG);
 611         } else {
 612                 data_timeout = (data_timeout >> 10) + 1;
 613                 if (data_timeout > 0xffff)
 614                         data_timeout = 0;       /* set to unlimited */
 615                 writel(data_timeout, sock->addr + SOCK_MMCSD_DATA_TO);
 616                 writel(TIFM_MMCSD_DPE
 617                        | readl(sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG),
 618                        sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG);
 619         }
 620 }
 621
 622 static void tifm_sd_request(struct mmc_host *mmc, struct mmc_request *mrq)
 623 {
 624         struct tifm_sd *host = mmc_priv(mmc);
 625         struct tifm_dev *sock = host->dev;
 626         unsigned long flags;
 627         struct mmc_data *r_data = mrq->cmd->data;
 628
 629         spin_lock_irqsave(&sock->lock, flags);
 630         if (host->eject) {
 631                 mrq->cmd->error = -ENOMEDIUM;
 632                 goto err_out;
 633         }
 634
 635         if (host->req) {
 636                 pr_err("%s : unfinished request detected\n",
 637                        dev_name(&sock->dev));
 638                 mrq->cmd->error = -ETIMEDOUT;
 639                 goto err_out;
 640         }
 641
 642         host->cmd_flags = 0;
 643         host->block_pos = 0;
 644         host->sg_pos = 0;
 645
 646         if (mrq->data && !is_power_of_2(mrq->data->blksz))
 647                 host->no_dma = 1;
 648         else
 649                 host->no_dma = no_dma ? 1 : 0;
 650
 651         if (r_data) {
 652                 tifm_sd_set_data_timeout(host, r_data);
 653
 654                 if ((r_data->flags & MMC_DATA_WRITE) && !mrq->stop)
 655                          writel(TIFM_MMCSD_EOFB
 656                                 | readl(sock->addr + SOCK_MMCSD_INT_ENABLE),
 657                                 sock->addr + SOCK_MMCSD_INT_ENABLE);
 658
 659                 if (host->no_dma) {
 660                         writel(TIFM_MMCSD_BUFINT
 661                                | readl(sock->addr + SOCK_MMCSD_INT_ENABLE),
 662                                sock->addr + SOCK_MMCSD_INT_ENABLE);
 663                         writel(((TIFM_MMCSD_FIFO_SIZE - 1) << 8)
 664                                | (TIFM_MMCSD_FIFO_SIZE - 1),
 665                                sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
 666
 667                         host->sg_len = r_data->sg_len;
 668                 } else {
 669                         sg_init_one(&host->bounce_buf, host->bounce_buf_data,
 670                                     r_data->blksz);
 671
 672                         if(1 != tifm_map_sg(sock, &host->bounce_buf, 1,
 673                                             r_data->flags & MMC_DATA_WRITE
 674                                             ? PCI_DMA_TODEVICE
 675                                             : PCI_DMA_FROMDEVICE)) {
 676                                 pr_err("%s : scatterlist map failed\n",
 677                                        dev_name(&sock->dev));
 678                                 mrq->cmd->error = -ENOMEM;
 679                                 goto err_out;
 680                         }
 681                         host->sg_len = tifm_map_sg(sock, r_data->sg,
 682                                                    r_data->sg_len,
 683                                                    r_data->flags
 684                                                    & MMC_DATA_WRITE
 685                                                    ? PCI_DMA_TODEVICE
 686                                                    : PCI_DMA_FROMDEVICE);
 687                         if (host->sg_len < 1) {
 688                                 pr_err("%s : scatterlist map failed\n",
 689                                        dev_name(&sock->dev));
 690                                 tifm_unmap_sg(sock, &host->bounce_buf, 1,
 691                                               r_data->flags & MMC_DATA_WRITE
 692                                               ? PCI_DMA_TODEVICE
 693                                               : PCI_DMA_FROMDEVICE);
 694                                 mrq->cmd->error = -ENOMEM;
 695                                 goto err_out;
 696                         }
 697
 698                         writel(TIFM_FIFO_INT_SETALL,
 699                                sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
 700                         writel(ilog2(r_data->blksz) - 2,
 701                                sock->addr + SOCK_FIFO_PAGE_SIZE);
 702                         writel(TIFM_FIFO_ENABLE,
 703                                sock->addr + SOCK_FIFO_CONTROL);
 704                         writel(TIFM_FIFO_INTMASK,
 705                                sock->addr + SOCK_DMA_FIFO_INT_ENABLE_SET);
 706
 707                         if (r_data->flags & MMC_DATA_WRITE)
 708                                 writel(TIFM_MMCSD_TXDE,
 709                                        sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
 710                         else
 711                                 writel(TIFM_MMCSD_RXDE,
 712                                        sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
 713
 714                         tifm_sd_set_dma_data(host, r_data);
 715                 }
 716
 717                 writel(r_data->blocks - 1,
 718                        sock->addr + SOCK_MMCSD_NUM_BLOCKS);
 719                 writel(r_data->blksz - 1,
 720                        sock->addr + SOCK_MMCSD_BLOCK_LEN);
 721         }
 722
 723         host->req = mrq;
 724         mod_timer(&host->timer, jiffies + host->timeout_jiffies);
 725         writel(TIFM_CTRL_LED | readl(sock->addr + SOCK_CONTROL),
 726                sock->addr + SOCK_CONTROL);
 727         tifm_sd_exec(host, mrq->cmd);
 728         spin_unlock_irqrestore(&sock->lock, flags);
 729         return;
 730
 731 err_out:
 732         spin_unlock_irqrestore(&sock->lock, flags);
 733         mmc_request_done(mmc, mrq);
 734 }
 735
 736 static void tifm_sd_end_cmd(unsigned long data)
 737 {
 738         struct tifm_sd *host = (struct tifm_sd*)data;
 739         struct tifm_dev *sock = host->dev;
 740         struct mmc_host *mmc = tifm_get_drvdata(sock);
 741         struct mmc_request *mrq;
 742         struct mmc_data *r_data = NULL;
 743         unsigned long flags;
 744
 745         spin_lock_irqsave(&sock->lock, flags);
 746
 747         del_timer(&host->timer);
 748         mrq = host->req;
 749         host->req = NULL;
 750
 751         if (!mrq) {
 752                 pr_err(" %s : no request to complete?\n",
 753                        dev_name(&sock->dev));
 754                 spin_unlock_irqrestore(&sock->lock, flags);
 755                 return;
 756         }
 757
 758         r_data = mrq->cmd->data;
 759         if (r_data) {
 760                 if (host->no_dma) {
 761                         writel((~TIFM_MMCSD_BUFINT)
 762                                & readl(sock->addr + SOCK_MMCSD_INT_ENABLE),
 763                                sock->addr + SOCK_MMCSD_INT_ENABLE);
 764                 } else {
 765                         tifm_unmap_sg(sock, &host->bounce_buf, 1,
 766                                       (r_data->flags & MMC_DATA_WRITE)
 767                                       ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
 768                         tifm_unmap_sg(sock, r_data->sg, r_data->sg_len,
 769                                       (r_data->flags & MMC_DATA_WRITE)
 770                                       ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
 771                 }
 772
 773                 r_data->bytes_xfered = r_data->blocks
 774                         - readl(sock->addr + SOCK_MMCSD_NUM_BLOCKS) - 1;
 775                 r_data->bytes_xfered *= r_data->blksz;
 776                 r_data->bytes_xfered += r_data->blksz
 777                         - readl(sock->addr + SOCK_MMCSD_BLOCK_LEN) + 1;
 778         }
 779
 780         writel((~TIFM_CTRL_LED) & readl(sock->addr + SOCK_CONTROL),
 781                sock->addr + SOCK_CONTROL);
 782
 783         spin_unlock_irqrestore(&sock->lock, flags);
 784         mmc_request_done(mmc, mrq);
 785 }
 786
 787 static void tifm_sd_abort(struct timer_list *t)
 788 {
 789         struct tifm_sd *host = from_timer(host, t, timer);
 790
 791         pr_err("%s : card failed to respond for a long period of time "
 792                "(%x, %x)\n",
 793                dev_name(&host->dev->dev), host->req->cmd->opcode, host->cmd_flags);
 794
 795         tifm_eject(host->dev);
 796 }
 797
 798 static void tifm_sd_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 799 {
 800         struct tifm_sd *host = mmc_priv(mmc);
 801         struct tifm_dev *sock = host->dev;
 802         unsigned int clk_div1, clk_div2;
 803         unsigned long flags;
 804
 805         spin_lock_irqsave(&sock->lock, flags);
 806
 807         dev_dbg(&sock->dev, "ios: clock = %u, vdd = %x, bus_mode = %x, "
 808                 "chip_select = %x, power_mode = %x, bus_width = %x\n",
 809                 ios->clock, ios->vdd, ios->bus_mode, ios->chip_select,
 810                 ios->power_mode, ios->bus_width);
 811
 812         if (ios->bus_width == MMC_BUS_WIDTH_4) {
 813                 writel(TIFM_MMCSD_4BBUS | readl(sock->addr + SOCK_MMCSD_CONFIG),
 814                        sock->addr + SOCK_MMCSD_CONFIG);
 815         } else {
 816                 writel((~TIFM_MMCSD_4BBUS)
 817                        & readl(sock->addr + SOCK_MMCSD_CONFIG),
 818                        sock->addr + SOCK_MMCSD_CONFIG);
 819         }
 820
 821         if (ios->clock) {
 822                 clk_div1 = 20000000 / ios->clock;
 823                 if (!clk_div1)
 824                         clk_div1 = 1;
 825
 826                 clk_div2 = 24000000 / ios->clock;
 827                 if (!clk_div2)
 828                         clk_div2 = 1;
 829
 830                 if ((20000000 / clk_div1) > ios->clock)
 831                         clk_div1++;
 832                 if ((24000000 / clk_div2) > ios->clock)
 833                         clk_div2++;
 834                 if ((20000000 / clk_div1) > (24000000 / clk_div2)) {
 835                         host->clk_freq = 20000000;
 836                         host->clk_div = clk_div1;
 837                         writel((~TIFM_CTRL_FAST_CLK)
 838                                & readl(sock->addr + SOCK_CONTROL),
 839                                sock->addr + SOCK_CONTROL);
 840                 } else {
 841                         host->clk_freq = 24000000;
 842                         host->clk_div = clk_div2;
 843                         writel(TIFM_CTRL_FAST_CLK
 844                                | readl(sock->addr + SOCK_CONTROL),
 845                                sock->addr + SOCK_CONTROL);
 846                 }
 847         } else {
 848                 host->clk_div = 0;
 849         }
 850         host->clk_div &= TIFM_MMCSD_CLKMASK;
 851         writel(host->clk_div
 852                | ((~TIFM_MMCSD_CLKMASK)
 853                   & readl(sock->addr + SOCK_MMCSD_CONFIG)),
 854                sock->addr + SOCK_MMCSD_CONFIG);
 855
 856         host->open_drain = (ios->bus_mode == MMC_BUSMODE_OPENDRAIN);
 857
 858         /* chip_select : maybe later */
 859         //vdd
 860         //power is set before probe / after remove
 861
 862         spin_unlock_irqrestore(&sock->lock, flags);
 863 }
 864
 865 static int tifm_sd_ro(struct mmc_host *mmc)
 866 {
 867         int rc = 0;
 868         struct tifm_sd *host = mmc_priv(mmc);
 869         struct tifm_dev *sock = host->dev;
 870         unsigned long flags;
 871
 872         spin_lock_irqsave(&sock->lock, flags);
 873         if (TIFM_MMCSD_CARD_RO & readl(sock->addr + SOCK_PRESENT_STATE))
 874                 rc = 1;
 875         spin_unlock_irqrestore(&sock->lock, flags);
 876         return rc;
 877 }
 878
 879 static const struct mmc_host_ops tifm_sd_ops = {
 880         .request = tifm_sd_request,
 881         .set_ios = tifm_sd_ios,
 882         .get_ro  = tifm_sd_ro
 883 };
 884
 885 static int tifm_sd_initialize_host(struct tifm_sd *host)
 886 {
 887         int rc;
 888         unsigned int host_status = 0;
 889         struct tifm_dev *sock = host->dev;
 890
 891         writel(0, sock->addr + SOCK_MMCSD_INT_ENABLE);
 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
 943         return 0;
 944 }
 945
 946 static int tifm_sd_probe(struct tifm_dev *sock)
 947 {
 948         struct mmc_host *mmc;
 949         struct tifm_sd *host;
 950         int rc = -EIO;
 951
 952         if (!(TIFM_SOCK_STATE_OCCUPIED
 953               & readl(sock->addr + SOCK_PRESENT_STATE))) {
 954                 pr_warn("%s : card gone, unexpectedly\n",
 955                         dev_name(&sock->dev));
 956                 return rc;
 957         }
 958
 959         mmc = mmc_alloc_host(sizeof(struct tifm_sd), &sock->dev);
 960         if (!mmc)
 961                 return -ENOMEM;
 962
 963         host = mmc_priv(mmc);
 964         tifm_set_drvdata(sock, mmc);
 965         host->dev = sock;
 966         host->timeout_jiffies = msecs_to_jiffies(1000);
 967
 968         tasklet_init(&host->finish_tasklet, tifm_sd_end_cmd,
 969                      (unsigned long)host);
 970         timer_setup(&host->timer, tifm_sd_abort, 0);
 971
 972         mmc->ops = &tifm_sd_ops;
 973         mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
 974         mmc->caps = MMC_CAP_4_BIT_DATA;
 975         mmc->f_min = 20000000 / 60;
 976         mmc->f_max = 24000000;
 977
 978         mmc->max_blk_count = 2048;
 979         mmc->max_segs = mmc->max_blk_count;
 980         mmc->max_blk_size = min(TIFM_MMCSD_MAX_BLOCK_SIZE, PAGE_SIZE);
 981         mmc->max_seg_size = mmc->max_blk_count * mmc->max_blk_size;
 982         mmc->max_req_size = mmc->max_seg_size;
 983
 984         sock->card_event = tifm_sd_card_event;
 985         sock->data_event = tifm_sd_data_event;
 986         rc = tifm_sd_initialize_host(host);
 987
 988         if (!rc)
 989                 rc = mmc_add_host(mmc);
 990         if (!rc)
 991                 return 0;
 992
 993         mmc_free_host(mmc);
 994         return rc;
 995 }
 996
 997 static void tifm_sd_remove(struct tifm_dev *sock)
 998 {
 999         struct mmc_host *mmc = tifm_get_drvdata(sock);
1000         struct tifm_sd *host = mmc_priv(mmc);
1001         unsigned long flags;
1002
1003         spin_lock_irqsave(&sock->lock, flags);
1004         host->eject = 1;
1005         writel(0, sock->addr + SOCK_MMCSD_INT_ENABLE);
1006         spin_unlock_irqrestore(&sock->lock, flags);
1007
1008         tasklet_kill(&host->finish_tasklet);
1009
1010         spin_lock_irqsave(&sock->lock, flags);
1011         if (host->req) {
1012                 writel(TIFM_FIFO_INT_SETALL,
1013                        sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
1014                 writel(0, sock->addr + SOCK_DMA_FIFO_INT_ENABLE_SET);
1015                 host->req->cmd->error = -ENOMEDIUM;
1016                 if (host->req->stop)
1017                         host->req->stop->error = -ENOMEDIUM;
1018                 tasklet_schedule(&host->finish_tasklet);
1019         }
1020         spin_unlock_irqrestore(&sock->lock, flags);
1021         mmc_remove_host(mmc);
1022         dev_dbg(&sock->dev, "after remove\n");
1023
1024         mmc_free_host(mmc);
1025 }
1026
1027 #ifdef CONFIG_PM
1028
1029 static int tifm_sd_suspend(struct tifm_dev *sock, pm_message_t state)
1030 {
1031         return 0;
1032 }
1033
1034 static int tifm_sd_resume(struct tifm_dev *sock)
1035 {
1036         struct mmc_host *mmc = tifm_get_drvdata(sock);
1037         struct tifm_sd *host = mmc_priv(mmc);
1038         int rc;
1039
1040         rc = tifm_sd_initialize_host(host);
1041         dev_dbg(&sock->dev, "resume initialize %d\n", rc);
1042
1043         if (rc)
1044                 host->eject = 1;
1045
1046         return rc;
1047 }
1048
1049 #else
1050
1051 #define tifm_sd_suspend NULL
1052 #define tifm_sd_resume NULL
1053
1054 #endif /* CONFIG_PM */
1055
1056 static struct tifm_device_id tifm_sd_id_tbl[] = {
1057         { TIFM_TYPE_SD }, { }
1058 };
1059
1060 static struct tifm_driver tifm_sd_driver = {
1061         .driver = {
1062                 .name  = DRIVER_NAME,
1063                 .owner = THIS_MODULE
1064         },
1065         .id_table = tifm_sd_id_tbl,
1066         .probe    = tifm_sd_probe,
1067         .remove   = tifm_sd_remove,
1068         .suspend  = tifm_sd_suspend,
1069         .resume   = tifm_sd_resume
1070 };
1071
1072 static int __init tifm_sd_init(void)
1073 {
1074         return tifm_register_driver(&tifm_sd_driver);
1075 }
1076
1077 static void __exit tifm_sd_exit(void)
1078 {
1079         tifm_unregister_driver(&tifm_sd_driver);
1080 }
1081
1082 MODULE_AUTHOR("Alex Dubov");
1083 MODULE_DESCRIPTION("TI FlashMedia SD driver");
1084 MODULE_LICENSE("GPL");
1085 MODULE_DEVICE_TABLE(tifm, tifm_sd_id_tbl);
1086 MODULE_VERSION(DRIVER_VERSION);
1087
1088 module_init(tifm_sd_init);
1089 module_exit(tifm_sd_exit);