drivers/mmc/host/tifm_sd.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  tifm_sd.c - TI FlashMedia driver
   4  *
   5  *  Copyright (C) 2006 Alex Dubov <oakad@yahoo.com>
   6  *
   7  * Special thanks to Brad Campbell for extensive testing of this driver.
   8  */
   9
  10
  11 #include <linux/tifm.h>
  12 #include <linux/mmc/host.h>
  13 #include <linux/highmem.h>
  14 #include <linux/scatterlist.h>
  15 #include <linux/module.h>
  16 #include <asm/io.h>
  17
  18 #define DRIVER_NAME "tifm_sd"
  19 #define DRIVER_VERSION "0.8"
  20
  21 static bool no_dma = 0;
  22 static bool fixed_timeout = 0;
  23 module_param(no_dma, bool, 0644);
  24 module_param(fixed_timeout, bool, 0644);
  25
  26 /* Constants here are mostly from OMAP5912 datasheet */
  27 #define TIFM_MMCSD_RESET      0x0002
  28 #define TIFM_MMCSD_CLKMASK    0x03ff
  29 #define TIFM_MMCSD_POWER      0x0800
  30 #define TIFM_MMCSD_4BBUS      0x8000
  31 #define TIFM_MMCSD_RXDE       0x8000   /* rx dma enable */
  32 #define TIFM_MMCSD_TXDE       0x0080   /* tx dma enable */
  33 #define TIFM_MMCSD_BUFINT     0x0c00   /* set bits: AE, AF */
  34 #define TIFM_MMCSD_DPE        0x0020   /* data timeout counted in kilocycles */
  35 #define TIFM_MMCSD_INAB       0x0080   /* abort / initialize command */
  36 #define TIFM_MMCSD_READ       0x8000
  37
  38 #define TIFM_MMCSD_ERRMASK    0x01e0   /* set bits: CCRC, CTO, DCRC, DTO */
  39 #define TIFM_MMCSD_EOC        0x0001   /* end of command phase  */
  40 #define TIFM_MMCSD_CD         0x0002   /* card detect           */
  41 #define TIFM_MMCSD_CB         0x0004   /* card enter busy state */
  42 #define TIFM_MMCSD_BRS        0x0008   /* block received/sent   */
  43 #define TIFM_MMCSD_EOFB       0x0010   /* card exit busy state  */
  44 #define TIFM_MMCSD_DTO        0x0020   /* data time-out         */
  45 #define TIFM_MMCSD_DCRC       0x0040   /* data crc error        */
  46 #define TIFM_MMCSD_CTO        0x0080   /* command time-out      */
  47 #define TIFM_MMCSD_CCRC       0x0100   /* command crc error     */
  48 #define TIFM_MMCSD_AF         0x0400   /* fifo almost full      */
  49 #define TIFM_MMCSD_AE         0x0800   /* fifo almost empty     */
  50 #define TIFM_MMCSD_OCRB       0x1000   /* OCR busy              */
  51 #define TIFM_MMCSD_CIRQ       0x2000   /* card irq (cmd40/sdio) */
  52 #define TIFM_MMCSD_CERR       0x4000   /* card status error     */
  53
  54 #define TIFM_MMCSD_ODTO       0x0040   /* open drain / extended timeout */
  55 #define TIFM_MMCSD_CARD_RO    0x0200   /* card is read-only     */
  56
  57 #define TIFM_MMCSD_FIFO_SIZE  0x0020
  58
  59 #define TIFM_MMCSD_RSP_R0     0x0000
  60 #define TIFM_MMCSD_RSP_R1     0x0100
  61 #define TIFM_MMCSD_RSP_R2     0x0200
  62 #define TIFM_MMCSD_RSP_R3     0x0300
  63 #define TIFM_MMCSD_RSP_R4     0x0400
  64 #define TIFM_MMCSD_RSP_R5     0x0500
  65 #define TIFM_MMCSD_RSP_R6     0x0600
  66
  67 #define TIFM_MMCSD_RSP_BUSY   0x0800
  68
  69 #define TIFM_MMCSD_CMD_BC     0x0000
  70 #define TIFM_MMCSD_CMD_BCR    0x1000
  71 #define TIFM_MMCSD_CMD_AC     0x2000
  72 #define TIFM_MMCSD_CMD_ADTC   0x3000
  73
  74 #define TIFM_MMCSD_MAX_BLOCK_SIZE  0x0800UL
  75
  76 enum {
  77         CMD_READY    = 0x0001,
  78         FIFO_READY   = 0x0002,
  79         BRS_READY    = 0x0004,
  80         SCMD_ACTIVE  = 0x0008,
  81         SCMD_READY   = 0x0010,
  82         CARD_BUSY    = 0x0020,
  83         DATA_CARRY   = 0x0040
  84 };
  85
  86 struct tifm_sd {
  87         struct tifm_dev       *dev;
  88
  89         unsigned short        eject:1,
  90                               open_drain:1,
  91                               no_dma:1;
  92         unsigned short        cmd_flags;
  93
  94         unsigned int          clk_freq;
  95         unsigned int          clk_div;
  96         unsigned long         timeout_jiffies;
  97
  98         struct tasklet_struct finish_tasklet;
  99         struct timer_list     timer;
 100         struct mmc_request    *req;
 101
 102         int                   sg_len;
 103         int                   sg_pos;
 104         unsigned int          block_pos;
 105         struct scatterlist    bounce_buf;
 106         unsigned char         bounce_buf_data[TIFM_MMCSD_MAX_BLOCK_SIZE];
 107 };
 108
 109 /* for some reason, host won't respond correctly to readw/writew */
 110 static void tifm_sd_read_fifo(struct tifm_sd *host, struct page *pg,
 111                               unsigned int off, unsigned int cnt)
 112 {
 113         struct tifm_dev *sock = host->dev;
 114         unsigned char *buf;
 115         unsigned int pos = 0, val;
 116
 117         buf = kmap_atomic(pg) + off;
 118         if (host->cmd_flags & DATA_CARRY) {
 119                 buf[pos++] = host->bounce_buf_data[0];
 120                 host->cmd_flags &= ~DATA_CARRY;
 121         }
 122
 123         while (pos < cnt) {
 124                 val = readl(sock->addr + SOCK_MMCSD_DATA);
 125                 buf[pos++] = val & 0xff;
 126                 if (pos == cnt) {
 127                         host->bounce_buf_data[0] = (val >> 8) & 0xff;
 128                         host->cmd_flags |= DATA_CARRY;
 129                         break;
 130                 }
 131                 buf[pos++] = (val >> 8) & 0xff;
 132         }
 133         kunmap_atomic(buf - off);
 134 }
 135
 136 static void tifm_sd_write_fifo(struct tifm_sd *host, struct page *pg,
 137                                unsigned int off, unsigned int cnt)
 138 {
 139         struct tifm_dev *sock = host->dev;
 140         unsigned char *buf;
 141         unsigned int pos = 0, val;
 142
 143         buf = kmap_atomic(pg) + off;
 144         if (host->cmd_flags & DATA_CARRY) {
 145                 val = host->bounce_buf_data[0] | ((buf[pos++] << 8) & 0xff00);
 146                 writel(val, sock->addr + SOCK_MMCSD_DATA);
 147                 host->cmd_flags &= ~DATA_CARRY;
 148         }
 149
 150         while (pos < cnt) {
 151                 val = buf[pos++];
 152                 if (pos == cnt) {
 153                         host->bounce_buf_data[0] = val & 0xff;
 154                         host->cmd_flags |= DATA_CARRY;
 155                         break;
 156                 }
 157                 val |= (buf[pos++] << 8) & 0xff00;
 158                 writel(val, sock->addr + SOCK_MMCSD_DATA);
 159         }
 160         kunmap_atomic(buf - off);
 161 }
 162
 163 static void tifm_sd_transfer_data(struct tifm_sd *host)
 164 {
 165         struct mmc_data *r_data = host->req->cmd->data;
 166         struct scatterlist *sg = r_data->sg;
 167         unsigned int off, cnt, t_size = TIFM_MMCSD_FIFO_SIZE * 2;
 168         unsigned int p_off, p_cnt;
 169         struct page *pg;
 170
 171         if (host->sg_pos == host->sg_len)
 172                 return;
 173         while (t_size) {
 174                 cnt = sg[host->sg_pos].length - host->block_pos;
 175                 if (!cnt) {
 176                         host->block_pos = 0;
 177                         host->sg_pos++;
 178                         if (host->sg_pos == host->sg_len) {
 179                                 if ((r_data->flags & MMC_DATA_WRITE)
 180                                     && (host->cmd_flags & DATA_CARRY))
 181                                         writel(host->bounce_buf_data[0],
 182                                                host->dev->addr
 183                                                + SOCK_MMCSD_DATA);
 184
 185                                 return;
 186                         }
 187                         cnt = sg[host->sg_pos].length;
 188                 }
 189                 off = sg[host->sg_pos].offset + host->block_pos;
 190
 191                 pg = nth_page(sg_page(&sg[host->sg_pos]), off >> PAGE_SHIFT);
 192                 p_off = offset_in_page(off);
 193                 p_cnt = PAGE_SIZE - p_off;
 194                 p_cnt = min(p_cnt, cnt);
 195                 p_cnt = min(p_cnt, t_size);
 196
 197                 if (r_data->flags & MMC_DATA_READ)
 198                         tifm_sd_read_fifo(host, pg, p_off, p_cnt);
 199                 else if (r_data->flags & MMC_DATA_WRITE)
 200                         tifm_sd_write_fifo(host, pg, p_off, p_cnt);
 201
 202                 t_size -= p_cnt;
 203                 host->block_pos += p_cnt;
 204         }
 205 }
 206
 207 static void tifm_sd_copy_page(struct page *dst, unsigned int dst_off,
 208                               struct page *src, unsigned int src_off,
 209                               unsigned int count)
 210 {
 211         unsigned char *src_buf = kmap_atomic(src) + src_off;
 212         unsigned char *dst_buf = kmap_atomic(dst) + dst_off;
 213
 214         memcpy(dst_buf, src_buf, count);
 215
 216         kunmap_atomic(dst_buf - dst_off);
 217         kunmap_atomic(src_buf - src_off);
 218 }
 219
 220 static void tifm_sd_bounce_block(struct tifm_sd *host, struct mmc_data *r_data)
 221 {
 222         struct scatterlist *sg = r_data->sg;
 223         unsigned int t_size = r_data->blksz;
 224         unsigned int off, cnt;
 225         unsigned int p_off, p_cnt;
 226         struct page *pg;
 227
 228         dev_dbg(&host->dev->dev, "bouncing block\n");
 229         while (t_size) {
 230                 cnt = sg[host->sg_pos].length - host->block_pos;
 231                 if (!cnt) {
 232                         host->block_pos = 0;
 233                         host->sg_pos++;
 234                         if (host->sg_pos == host->sg_len)
 235                                 return;
 236                         cnt = sg[host->sg_pos].length;
 237                 }
 238                 off = sg[host->sg_pos].offset + host->block_pos;
 239
 240                 pg = nth_page(sg_page(&sg[host->sg_pos]), off >> PAGE_SHIFT);
 241                 p_off = offset_in_page(off);
 242                 p_cnt = PAGE_SIZE - p_off;
 243                 p_cnt = min(p_cnt, cnt);
 244                 p_cnt = min(p_cnt, t_size);
 245
 246                 if (r_data->flags & MMC_DATA_WRITE)
 247                         tifm_sd_copy_page(sg_page(&host->bounce_buf),
 248                                           r_data->blksz - t_size,
 249                                           pg, p_off, p_cnt);
 250                 else if (r_data->flags & MMC_DATA_READ)
 251                         tifm_sd_copy_page(pg, p_off, sg_page(&host->bounce_buf),
 252                                           r_data->blksz - t_size, p_cnt);
 253
 254                 t_size -= p_cnt;
 255                 host->block_pos += p_cnt;
 256         }
 257 }
 258
 259 static int tifm_sd_set_dma_data(struct tifm_sd *host, struct mmc_data *r_data)
 260 {
 261         struct tifm_dev *sock = host->dev;
 262         unsigned int t_size = TIFM_DMA_TSIZE * r_data->blksz;
 263         unsigned int dma_len, dma_blk_cnt, dma_off;
 264         struct scatterlist *sg = NULL;
 265         unsigned long flags;
 266
 267         if (host->sg_pos == host->sg_len)
 268                 return 1;
 269
 270         if (host->cmd_flags & DATA_CARRY) {
 271                 host->cmd_flags &= ~DATA_CARRY;
 272                 local_irq_save(flags);
 273                 tifm_sd_bounce_block(host, r_data);
 274                 local_irq_restore(flags);
 275                 if (host->sg_pos == host->sg_len)
 276                         return 1;
 277         }
 278
 279         dma_len = sg_dma_len(&r_data->sg[host->sg_pos]) - host->block_pos;
 280         if (!dma_len) {
 281                 host->block_pos = 0;
 282                 host->sg_pos++;
 283                 if (host->sg_pos == host->sg_len)
 284                         return 1;
 285                 dma_len = sg_dma_len(&r_data->sg[host->sg_pos]);
 286         }
 287
 288         if (dma_len < t_size) {
 289                 dma_blk_cnt = dma_len / r_data->blksz;
 290                 dma_off = host->block_pos;
 291                 host->block_pos += dma_blk_cnt * r_data->blksz;
 292         } else {
 293                 dma_blk_cnt = TIFM_DMA_TSIZE;
 294                 dma_off = host->block_pos;
 295                 host->block_pos += t_size;
 296         }
 297
 298         if (dma_blk_cnt)
 299                 sg = &r_data->sg[host->sg_pos];
 300         else if (dma_len) {
 301                 if (r_data->flags & MMC_DATA_WRITE) {
 302                         local_irq_save(flags);
 303                         tifm_sd_bounce_block(host, r_data);
 304                         local_irq_restore(flags);
 305                 } else
 306                         host->cmd_flags |= DATA_CARRY;
 307
 308                 sg = &host->bounce_buf;
 309                 dma_off = 0;
 310                 dma_blk_cnt = 1;
 311         } else
 312                 return 1;
 313
 314         dev_dbg(&sock->dev, "setting dma for %d blocks\n", dma_blk_cnt);
 315         writel(sg_dma_address(sg) + dma_off, sock->addr + SOCK_DMA_ADDRESS);
 316         if (r_data->flags & MMC_DATA_WRITE)
 317                 writel((dma_blk_cnt << 8) | TIFM_DMA_TX | TIFM_DMA_EN,
 318                        sock->addr + SOCK_DMA_CONTROL);
 319         else
 320                 writel((dma_blk_cnt << 8) | TIFM_DMA_EN,
 321                        sock->addr + SOCK_DMA_CONTROL);
 322
 323         return 0;
 324 }
 325
 326 static unsigned int tifm_sd_op_flags(struct mmc_command *cmd)
 327 {
 328         unsigned int rc = 0;
 329
 330         switch (mmc_resp_type(cmd)) {
 331         case MMC_RSP_NONE:
 332                 rc |= TIFM_MMCSD_RSP_R0;
 333                 break;
 334         case MMC_RSP_R1B:
 335                 rc |= TIFM_MMCSD_RSP_BUSY;
 336                 /* fall-through */
 337         case MMC_RSP_R1:
 338                 rc |= TIFM_MMCSD_RSP_R1;
 339                 break;
 340         case MMC_RSP_R2:
 341                 rc |= TIFM_MMCSD_RSP_R2;
 342                 break;
 343         case MMC_RSP_R3:
 344                 rc |= TIFM_MMCSD_RSP_R3;
 345                 break;
 346         default:
 347                 BUG();
 348         }
 349
 350         switch (mmc_cmd_type(cmd)) {
 351         case MMC_CMD_BC:
 352                 rc |= TIFM_MMCSD_CMD_BC;
 353                 break;
 354         case MMC_CMD_BCR:
 355                 rc |= TIFM_MMCSD_CMD_BCR;
 356                 break;
 357         case MMC_CMD_AC:
 358                 rc |= TIFM_MMCSD_CMD_AC;
 359                 break;
 360         case MMC_CMD_ADTC:
 361                 rc |= TIFM_MMCSD_CMD_ADTC;
 362                 break;
 363         default:
 364                 BUG();
 365         }
 366         return rc;
 367 }
 368
 369 static void tifm_sd_exec(struct tifm_sd *host, struct mmc_command *cmd)
 370 {
 371         struct tifm_dev *sock = host->dev;
 372         unsigned int cmd_mask = tifm_sd_op_flags(cmd);
 373
 374         if (host->open_drain)
 375                 cmd_mask |= TIFM_MMCSD_ODTO;
 376
 377         if (cmd->data && (cmd->data->flags & MMC_DATA_READ))
 378                 cmd_mask |= TIFM_MMCSD_READ;
 379
 380         dev_dbg(&sock->dev, "executing opcode 0x%x, arg: 0x%x, mask: 0x%x\n",
 381                 cmd->opcode, cmd->arg, cmd_mask);
 382
 383         writel((cmd->arg >> 16) & 0xffff, sock->addr + SOCK_MMCSD_ARG_HIGH);
 384         writel(cmd->arg & 0xffff, sock->addr + SOCK_MMCSD_ARG_LOW);
 385         writel(cmd->opcode | cmd_mask, sock->addr + SOCK_MMCSD_COMMAND);
 386 }
 387
 388 static void tifm_sd_fetch_resp(struct mmc_command *cmd, struct tifm_dev *sock)
 389 {
 390         cmd->resp[0] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x1c) << 16)
 391                        | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x18);
 392         cmd->resp[1] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x14) << 16)
 393                        | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x10);
 394         cmd->resp[2] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x0c) << 16)
 395                        | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x08);
 396         cmd->resp[3] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x04) << 16)
 397                        | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x00);
 398 }
 399
 400 static void tifm_sd_check_status(struct tifm_sd *host)
 401 {
 402         struct tifm_dev *sock = host->dev;
 403         struct mmc_command *cmd = host->req->cmd;
 404
 405         if (cmd->error)
 406                 goto finish_request;
 407
 408         if (!(host->cmd_flags & CMD_READY))
 409                 return;
 410
 411         if (cmd->data) {
 412                 if (cmd->data->error) {
 413                         if ((host->cmd_flags & SCMD_ACTIVE)
 414                             && !(host->cmd_flags & SCMD_READY))
 415                                 return;
 416
 417                         goto finish_request;
 418                 }
 419
 420                 if (!(host->cmd_flags & BRS_READY))
 421                         return;
 422
 423                 if (!(host->no_dma || (host->cmd_flags & FIFO_READY)))
 424                         return;
 425
 426                 if (cmd->data->flags & MMC_DATA_WRITE) {
 427                         if (host->req->stop) {
 428                                 if (!(host->cmd_flags & SCMD_ACTIVE)) {
 429                                         host->cmd_flags |= SCMD_ACTIVE;
 430                                         writel(TIFM_MMCSD_EOFB
 431                                                | readl(sock->addr
 432                                                        + SOCK_MMCSD_INT_ENABLE),
 433                                                sock->addr
 434                                                + SOCK_MMCSD_INT_ENABLE);
 435                                         tifm_sd_exec(host, host->req->stop);
 436                                         return;
 437                                 } else {
 438                                         if (!(host->cmd_flags & SCMD_READY)
 439                                             || (host->cmd_flags & CARD_BUSY))
 440                                                 return;
 441                                         writel((~TIFM_MMCSD_EOFB)
 442                                                & readl(sock->addr
 443                                                        + SOCK_MMCSD_INT_ENABLE),
 444                                                sock->addr
 445                                                + SOCK_MMCSD_INT_ENABLE);
 446                                 }
 447                         } else {
 448                                 if (host->cmd_flags & CARD_BUSY)
 449                                         return;
 450                                 writel((~TIFM_MMCSD_EOFB)
 451                                        & readl(sock->addr
 452                                                + SOCK_MMCSD_INT_ENABLE),
 453                                        sock->addr + SOCK_MMCSD_INT_ENABLE);
 454                         }
 455                 } else {
 456                         if (host->req->stop) {
 457                                 if (!(host->cmd_flags & SCMD_ACTIVE)) {
 458                                         host->cmd_flags |= SCMD_ACTIVE;
 459                                         tifm_sd_exec(host, host->req->stop);
 460                                         return;
 461                                 } else {
 462                                         if (!(host->cmd_flags & SCMD_READY))
 463                                                 return;
 464                                 }
 465                         }
 466                 }
 467         }
 468 finish_request:
 469         tasklet_schedule(&host->finish_tasklet);
 470 }
 471
 472 /* Called from interrupt handler */
 473 static void tifm_sd_data_event(struct tifm_dev *sock)
 474 {
 475         struct tifm_sd *host;
 476         unsigned int fifo_status = 0;
 477         struct mmc_data *r_data = NULL;
 478
 479         spin_lock(&sock->lock);
 480         host = mmc_priv((struct mmc_host*)tifm_get_drvdata(sock));
 481         fifo_status = readl(sock->addr + SOCK_DMA_FIFO_STATUS);
 482         dev_dbg(&sock->dev, "data event: fifo_status %x, flags %x\n",
 483                 fifo_status, host->cmd_flags);
 484
 485         if (host->req) {
 486                 r_data = host->req->cmd->data;
 487
 488                 if (r_data && (fifo_status & TIFM_FIFO_READY)) {
 489                         if (tifm_sd_set_dma_data(host, r_data)) {
 490                                 host->cmd_flags |= FIFO_READY;
 491                                 tifm_sd_check_status(host);
 492                         }
 493                 }
 494         }
 495
 496         writel(fifo_status, sock->addr + SOCK_DMA_FIFO_STATUS);
 497         spin_unlock(&sock->lock);
 498 }
 499
 500 /* Called from interrupt handler */
 501 static void tifm_sd_card_event(struct tifm_dev *sock)
 502 {
 503         struct tifm_sd *host;
 504         unsigned int host_status = 0;
 505         int cmd_error = 0;
 506         struct mmc_command *cmd = NULL;
 507         unsigned long flags;
 508
 509         spin_lock(&sock->lock);
 510         host = mmc_priv((struct mmc_host*)tifm_get_drvdata(sock));
 511         host_status = readl(sock->addr + SOCK_MMCSD_STATUS);
 512         dev_dbg(&sock->dev, "host event: host_status %x, flags %x\n",
 513                 host_status, host->cmd_flags);
 514
 515         if (host->req) {
 516                 cmd = host->req->cmd;
 517
 518                 if (host_status & TIFM_MMCSD_ERRMASK) {
 519                         writel(host_status & TIFM_MMCSD_ERRMASK,
 520                                sock->addr + SOCK_MMCSD_STATUS);
 521                         if (host_status & TIFM_MMCSD_CTO)
 522                                 cmd_error = -ETIMEDOUT;
 523                         else if (host_status & TIFM_MMCSD_CCRC)
 524                                 cmd_error = -EILSEQ;
 525
 526                         if (cmd->data) {
 527                                 if (host_status & TIFM_MMCSD_DTO)
 528                                         cmd->data->error = -ETIMEDOUT;
 529                                 else if (host_status & TIFM_MMCSD_DCRC)
 530                                         cmd->data->error = -EILSEQ;
 531                         }
 532
 533                         writel(TIFM_FIFO_INT_SETALL,
 534                                sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
 535                         writel(TIFM_DMA_RESET, sock->addr + SOCK_DMA_CONTROL);
 536
 537                         if (host->req->stop) {
 538                                 if (host->cmd_flags & SCMD_ACTIVE) {
 539                                         host->req->stop->error = cmd_error;
 540                                         host->cmd_flags |= SCMD_READY;
 541                                 } else {
 542                                         cmd->error = cmd_error;
 543                                         host->cmd_flags |= SCMD_ACTIVE;
 544                                         tifm_sd_exec(host, host->req->stop);
 545                                         goto done;
 546                                 }
 547                         } else
 548                                 cmd->error = cmd_error;
 549                 } else {
 550                         if (host_status & (TIFM_MMCSD_EOC | TIFM_MMCSD_CERR)) {
 551                                 if (!(host->cmd_flags & CMD_READY)) {
 552                                         host->cmd_flags |= CMD_READY;
 553                                         tifm_sd_fetch_resp(cmd, sock);
 554                                 } else if (host->cmd_flags & SCMD_ACTIVE) {
 555                                         host->cmd_flags |= SCMD_READY;
 556                                         tifm_sd_fetch_resp(host->req->stop,
 557                                                            sock);
 558                                 }
 559                         }
 560                         if (host_status & TIFM_MMCSD_BRS)
 561                                 host->cmd_flags |= BRS_READY;
 562                 }
 563
 564                 if (host->no_dma && cmd->data) {
 565                         if (host_status & TIFM_MMCSD_AE)
 566                                 writel(host_status & TIFM_MMCSD_AE,
 567                                        sock->addr + SOCK_MMCSD_STATUS);
 568
 569                         if (host_status & (TIFM_MMCSD_AE | TIFM_MMCSD_AF
 570                                            | TIFM_MMCSD_BRS)) {
 571                                 local_irq_save(flags);
 572                                 tifm_sd_transfer_data(host);
 573                                 local_irq_restore(flags);
 574                                 host_status &= ~TIFM_MMCSD_AE;
 575                         }
 576                 }
 577
 578                 if (host_status & TIFM_MMCSD_EOFB)
 579                         host->cmd_flags &= ~CARD_BUSY;
 580                 else if (host_status & TIFM_MMCSD_CB)
 581                         host->cmd_flags |= CARD_BUSY;
 582
 583                 tifm_sd_check_status(host);
 584         }
 585 done:
 586         writel(host_status, sock->addr + SOCK_MMCSD_STATUS);
 587         spin_unlock(&sock->lock);
 588 }
 589
 590 static void tifm_sd_set_data_timeout(struct tifm_sd *host,
 591                                      struct mmc_data *data)
 592 {
 593         struct tifm_dev *sock = host->dev;
 594         unsigned int data_timeout = data->timeout_clks;
 595
 596         if (fixed_timeout)
 597                 return;
 598
 599         data_timeout += data->timeout_ns /
 600                         ((1000000000UL / host->clk_freq) * host->clk_div);
 601
 602         if (data_timeout < 0xffff) {
 603                 writel(data_timeout, sock->addr + SOCK_MMCSD_DATA_TO);
 604                 writel((~TIFM_MMCSD_DPE)
 605                        & readl(sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG),
 606                        sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG);
 607         } else {
 608                 data_timeout = (data_timeout >> 10) + 1;
 609                 if (data_timeout > 0xffff)
 610                         data_timeout = 0;       /* set to unlimited */
 611                 writel(data_timeout, sock->addr + SOCK_MMCSD_DATA_TO);
 612                 writel(TIFM_MMCSD_DPE
 613                        | readl(sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG),
 614                        sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG);
 615         }
 616 }
 617
 618 static void tifm_sd_request(struct mmc_host *mmc, struct mmc_request *mrq)
 619 {
 620         struct tifm_sd *host = mmc_priv(mmc);
 621         struct tifm_dev *sock = host->dev;
 622         unsigned long flags;
 623         struct mmc_data *r_data = mrq->cmd->data;
 624
 625         spin_lock_irqsave(&sock->lock, flags);
 626         if (host->eject) {
 627                 mrq->cmd->error = -ENOMEDIUM;
 628                 goto err_out;
 629         }
 630
 631         if (host->req) {
 632                 pr_err("%s : unfinished request detected\n",
 633                        dev_name(&sock->dev));
 634                 mrq->cmd->error = -ETIMEDOUT;
 635                 goto err_out;
 636         }
 637
 638         host->cmd_flags = 0;
 639         host->block_pos = 0;
 640         host->sg_pos = 0;
 641
 642         if (mrq->data && !is_power_of_2(mrq->data->blksz))
 643                 host->no_dma = 1;
 644         else
 645                 host->no_dma = no_dma ? 1 : 0;
 646
 647         if (r_data) {
 648                 tifm_sd_set_data_timeout(host, r_data);
 649
 650                 if ((r_data->flags & MMC_DATA_WRITE) && !mrq->stop)
 651                          writel(TIFM_MMCSD_EOFB
 652                                 | readl(sock->addr + SOCK_MMCSD_INT_ENABLE),
 653                                 sock->addr + SOCK_MMCSD_INT_ENABLE);
 654
 655                 if (host->no_dma) {
 656                         writel(TIFM_MMCSD_BUFINT
 657                                | readl(sock->addr + SOCK_MMCSD_INT_ENABLE),
 658                                sock->addr + SOCK_MMCSD_INT_ENABLE);
 659                         writel(((TIFM_MMCSD_FIFO_SIZE - 1) << 8)
 660                                | (TIFM_MMCSD_FIFO_SIZE - 1),
 661                                sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
 662
 663                         host->sg_len = r_data->sg_len;
 664                 } else {
 665                         sg_init_one(&host->bounce_buf, host->bounce_buf_data,
 666                                     r_data->blksz);
 667
 668                         if(1 != tifm_map_sg(sock, &host->bounce_buf, 1,
 669                                             r_data->flags & MMC_DATA_WRITE
 670                                             ? PCI_DMA_TODEVICE
 671                                             : PCI_DMA_FROMDEVICE)) {
 672                                 pr_err("%s : scatterlist map failed\n",
 673                                        dev_name(&sock->dev));
 674                                 mrq->cmd->error = -ENOMEM;
 675                                 goto err_out;
 676                         }
 677                         host->sg_len = tifm_map_sg(sock, r_data->sg,
 678                                                    r_data->sg_len,
 679                                                    r_data->flags
 680                                                    & MMC_DATA_WRITE
 681                                                    ? PCI_DMA_TODEVICE
 682                                                    : PCI_DMA_FROMDEVICE);
 683                         if (host->sg_len < 1) {
 684                                 pr_err("%s : scatterlist map failed\n",
 685                                        dev_name(&sock->dev));
 686                                 tifm_unmap_sg(sock, &host->bounce_buf, 1,
 687                                               r_data->flags & MMC_DATA_WRITE
 688                                               ? PCI_DMA_TODEVICE
 689                                               : PCI_DMA_FROMDEVICE);
 690                                 mrq->cmd->error = -ENOMEM;
 691                                 goto err_out;
 692                         }
 693
 694                         writel(TIFM_FIFO_INT_SETALL,
 695                                sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
 696                         writel(ilog2(r_data->blksz) - 2,
 697                                sock->addr + SOCK_FIFO_PAGE_SIZE);
 698                         writel(TIFM_FIFO_ENABLE,
 699                                sock->addr + SOCK_FIFO_CONTROL);
 700                         writel(TIFM_FIFO_INTMASK,
 701                                sock->addr + SOCK_DMA_FIFO_INT_ENABLE_SET);
 702
 703                         if (r_data->flags & MMC_DATA_WRITE)
 704                                 writel(TIFM_MMCSD_TXDE,
 705                                        sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
 706                         else
 707                                 writel(TIFM_MMCSD_RXDE,
 708                                        sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
 709
 710                         tifm_sd_set_dma_data(host, r_data);
 711                 }
 712
 713                 writel(r_data->blocks - 1,
 714                        sock->addr + SOCK_MMCSD_NUM_BLOCKS);
 715                 writel(r_data->blksz - 1,
 716                        sock->addr + SOCK_MMCSD_BLOCK_LEN);
 717         }
 718
 719         host->req = mrq;
 720         mod_timer(&host->timer, jiffies + host->timeout_jiffies);
 721         writel(TIFM_CTRL_LED | readl(sock->addr + SOCK_CONTROL),
 722                sock->addr + SOCK_CONTROL);
 723         tifm_sd_exec(host, mrq->cmd);
 724         spin_unlock_irqrestore(&sock->lock, flags);
 725         return;
 726
 727 err_out:
 728         spin_unlock_irqrestore(&sock->lock, flags);
 729         mmc_request_done(mmc, mrq);
 730 }
 731
 732 static void tifm_sd_end_cmd(unsigned long data)
 733 {
 734         struct tifm_sd *host = (struct tifm_sd*)data;
 735         struct tifm_dev *sock = host->dev;
 736         struct mmc_host *mmc = tifm_get_drvdata(sock);
 737         struct mmc_request *mrq;
 738         struct mmc_data *r_data = NULL;
 739         unsigned long flags;
 740
 741         spin_lock_irqsave(&sock->lock, flags);
 742
 743         del_timer(&host->timer);
 744         mrq = host->req;
 745         host->req = NULL;
 746
 747         if (!mrq) {
 748                 pr_err(" %s : no request to complete?\n",
 749                        dev_name(&sock->dev));
 750                 spin_unlock_irqrestore(&sock->lock, flags);
 751                 return;
 752         }
 753
 754         r_data = mrq->cmd->data;
 755         if (r_data) {
 756                 if (host->no_dma) {
 757                         writel((~TIFM_MMCSD_BUFINT)
 758                                & readl(sock->addr + SOCK_MMCSD_INT_ENABLE),
 759                                sock->addr + SOCK_MMCSD_INT_ENABLE);
 760                 } else {
 761                         tifm_unmap_sg(sock, &host->bounce_buf, 1,
 762                                       (r_data->flags & MMC_DATA_WRITE)
 763                                       ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
 764                         tifm_unmap_sg(sock, r_data->sg, r_data->sg_len,
 765                                       (r_data->flags & MMC_DATA_WRITE)
 766                                       ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
 767                 }
 768
 769                 r_data->bytes_xfered = r_data->blocks
 770                         - readl(sock->addr + SOCK_MMCSD_NUM_BLOCKS) - 1;
 771                 r_data->bytes_xfered *= r_data->blksz;
 772                 r_data->bytes_xfered += r_data->blksz
 773                         - readl(sock->addr + SOCK_MMCSD_BLOCK_LEN) + 1;
 774         }
 775
 776         writel((~TIFM_CTRL_LED) & readl(sock->addr + SOCK_CONTROL),
 777                sock->addr + SOCK_CONTROL);
 778
 779         spin_unlock_irqrestore(&sock->lock, flags);
 780         mmc_request_done(mmc, mrq);
 781 }
 782
 783 static void tifm_sd_abort(struct timer_list *t)
 784 {
 785         struct tifm_sd *host = from_timer(host, t, timer);
 786
 787         pr_err("%s : card failed to respond for a long period of time "
 788                "(%x, %x)\n",
 789                dev_name(&host->dev->dev), host->req->cmd->opcode, host->cmd_flags);
 790
 791         tifm_eject(host->dev);
 792 }
 793
 794 static void tifm_sd_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 795 {
 796         struct tifm_sd *host = mmc_priv(mmc);
 797         struct tifm_dev *sock = host->dev;
 798         unsigned int clk_div1, clk_div2;
 799         unsigned long flags;
 800
 801         spin_lock_irqsave(&sock->lock, flags);
 802
 803         dev_dbg(&sock->dev, "ios: clock = %u, vdd = %x, bus_mode = %x, "
 804                 "chip_select = %x, power_mode = %x, bus_width = %x\n",
 805                 ios->clock, ios->vdd, ios->bus_mode, ios->chip_select,
 806                 ios->power_mode, ios->bus_width);
 807
 808         if (ios->bus_width == MMC_BUS_WIDTH_4) {
 809                 writel(TIFM_MMCSD_4BBUS | readl(sock->addr + SOCK_MMCSD_CONFIG),
 810                        sock->addr + SOCK_MMCSD_CONFIG);
 811         } else {
 812                 writel((~TIFM_MMCSD_4BBUS)
 813                        & readl(sock->addr + SOCK_MMCSD_CONFIG),
 814                        sock->addr + SOCK_MMCSD_CONFIG);
 815         }
 816
 817         if (ios->clock) {
 818                 clk_div1 = 20000000 / ios->clock;
 819                 if (!clk_div1)
 820                         clk_div1 = 1;
 821
 822                 clk_div2 = 24000000 / ios->clock;
 823                 if (!clk_div2)
 824                         clk_div2 = 1;
 825
 826                 if ((20000000 / clk_div1) > ios->clock)
 827                         clk_div1++;
 828                 if ((24000000 / clk_div2) > ios->clock)
 829                         clk_div2++;
 830                 if ((20000000 / clk_div1) > (24000000 / clk_div2)) {
 831                         host->clk_freq = 20000000;
 832                         host->clk_div = clk_div1;
 833                         writel((~TIFM_CTRL_FAST_CLK)
 834                                & readl(sock->addr + SOCK_CONTROL),
 835                                sock->addr + SOCK_CONTROL);
 836                 } else {
 837                         host->clk_freq = 24000000;
 838                         host->clk_div = clk_div2;
 839                         writel(TIFM_CTRL_FAST_CLK
 840                                | readl(sock->addr + SOCK_CONTROL),
 841                                sock->addr + SOCK_CONTROL);
 842                 }
 843         } else {
 844                 host->clk_div = 0;
 845         }
 846         host->clk_div &= TIFM_MMCSD_CLKMASK;
 847         writel(host->clk_div
 848                | ((~TIFM_MMCSD_CLKMASK)
 849                   & readl(sock->addr + SOCK_MMCSD_CONFIG)),
 850                sock->addr + SOCK_MMCSD_CONFIG);
 851
 852         host->open_drain = (ios->bus_mode == MMC_BUSMODE_OPENDRAIN);
 853
 854         /* chip_select : maybe later */
 855         //vdd
 856         //power is set before probe / after remove
 857
 858         spin_unlock_irqrestore(&sock->lock, flags);
 859 }
 860
 861 static int tifm_sd_ro(struct mmc_host *mmc)
 862 {
 863         int rc = 0;
 864         struct tifm_sd *host = mmc_priv(mmc);
 865         struct tifm_dev *sock = host->dev;
 866         unsigned long flags;
 867
 868         spin_lock_irqsave(&sock->lock, flags);
 869         if (TIFM_MMCSD_CARD_RO & readl(sock->addr + SOCK_PRESENT_STATE))
 870                 rc = 1;
 871         spin_unlock_irqrestore(&sock->lock, flags);
 872         return rc;
 873 }
 874
 875 static const struct mmc_host_ops tifm_sd_ops = {
 876         .request = tifm_sd_request,
 877         .set_ios = tifm_sd_ios,
 878         .get_ro  = tifm_sd_ro
 879 };
 880
 881 static int tifm_sd_initialize_host(struct tifm_sd *host)
 882 {
 883         int rc;
 884         unsigned int host_status = 0;
 885         struct tifm_dev *sock = host->dev;
 886
 887         writel(0, sock->addr + SOCK_MMCSD_INT_ENABLE);
 888         host->clk_div = 61;
 889         host->clk_freq = 20000000;
 890         writel(TIFM_MMCSD_RESET, sock->addr + SOCK_MMCSD_SYSTEM_CONTROL);
 891         writel(host->clk_div | TIFM_MMCSD_POWER,
 892                sock->addr + SOCK_MMCSD_CONFIG);
 893
 894         /* wait up to 0.51 sec for reset */
 895         for (rc = 32; rc <= 256; rc <<= 1) {
 896                 if (1 & readl(sock->addr + SOCK_MMCSD_SYSTEM_STATUS)) {
 897                         rc = 0;
 898                         break;
 899                 }
 900                 msleep(rc);
 901         }
 902
 903         if (rc) {
 904                 pr_err("%s : controller failed to reset\n",
 905                        dev_name(&sock->dev));
 906                 return -ENODEV;
 907         }
 908
 909         writel(0, sock->addr + SOCK_MMCSD_NUM_BLOCKS);
 910         writel(host->clk_div | TIFM_MMCSD_POWER,
 911                sock->addr + SOCK_MMCSD_CONFIG);
 912         writel(TIFM_MMCSD_RXDE, sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
 913
 914         // command timeout fixed to 64 clocks for now
 915         writel(64, sock->addr + SOCK_MMCSD_COMMAND_TO);
 916         writel(TIFM_MMCSD_INAB, sock->addr + SOCK_MMCSD_COMMAND);
 917
 918         for (rc = 16; rc <= 64; rc <<= 1) {
 919                 host_status = readl(sock->addr + SOCK_MMCSD_STATUS);
 920                 writel(host_status, sock->addr + SOCK_MMCSD_STATUS);
 921                 if (!(host_status & TIFM_MMCSD_ERRMASK)
 922                     && (host_status & TIFM_MMCSD_EOC)) {
 923                         rc = 0;
 924                         break;
 925                 }
 926                 msleep(rc);
 927         }
 928
 929         if (rc) {
 930                 pr_err("%s : card not ready - probe failed on initialization\n",
 931                        dev_name(&sock->dev));
 932                 return -ENODEV;
 933         }
 934
 935         writel(TIFM_MMCSD_CERR | TIFM_MMCSD_BRS | TIFM_MMCSD_EOC
 936                | TIFM_MMCSD_ERRMASK,
 937                sock->addr + SOCK_MMCSD_INT_ENABLE);
 938
 939         return 0;
 940 }
 941
 942 static int tifm_sd_probe(struct tifm_dev *sock)
 943 {
 944         struct mmc_host *mmc;
 945         struct tifm_sd *host;
 946         int rc = -EIO;
 947
 948         if (!(TIFM_SOCK_STATE_OCCUPIED
 949               & readl(sock->addr + SOCK_PRESENT_STATE))) {
 950                 pr_warn("%s : card gone, unexpectedly\n",
 951                         dev_name(&sock->dev));
 952                 return rc;
 953         }
 954
 955         mmc = mmc_alloc_host(sizeof(struct tifm_sd), &sock->dev);
 956         if (!mmc)
 957                 return -ENOMEM;
 958
 959         host = mmc_priv(mmc);
 960         tifm_set_drvdata(sock, mmc);
 961         host->dev = sock;
 962         host->timeout_jiffies = msecs_to_jiffies(1000);
 963
 964         tasklet_init(&host->finish_tasklet, tifm_sd_end_cmd,
 965                      (unsigned long)host);
 966         timer_setup(&host->timer, tifm_sd_abort, 0);
 967
 968         mmc->ops = &tifm_sd_ops;
 969         mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
 970         mmc->caps = MMC_CAP_4_BIT_DATA;
 971         mmc->f_min = 20000000 / 60;
 972         mmc->f_max = 24000000;
 973
 974         mmc->max_blk_count = 2048;
 975         mmc->max_segs = mmc->max_blk_count;
 976         mmc->max_blk_size = min(TIFM_MMCSD_MAX_BLOCK_SIZE, PAGE_SIZE);
 977         mmc->max_seg_size = mmc->max_blk_count * mmc->max_blk_size;
 978         mmc->max_req_size = mmc->max_seg_size;
 979
 980         sock->card_event = tifm_sd_card_event;
 981         sock->data_event = tifm_sd_data_event;
 982         rc = tifm_sd_initialize_host(host);
 983
 984         if (!rc)
 985                 rc = mmc_add_host(mmc);
 986         if (!rc)
 987                 return 0;
 988
 989         mmc_free_host(mmc);
 990         return rc;
 991 }
 992
 993 static void tifm_sd_remove(struct tifm_dev *sock)
 994 {
 995         struct mmc_host *mmc = tifm_get_drvdata(sock);
 996         struct tifm_sd *host = mmc_priv(mmc);
 997         unsigned long flags;
 998
 999         spin_lock_irqsave(&sock->lock, flags);
1000         host->eject = 1;
1001         writel(0, sock->addr + SOCK_MMCSD_INT_ENABLE);
1002         spin_unlock_irqrestore(&sock->lock, flags);
1003
1004         tasklet_kill(&host->finish_tasklet);
1005
1006         spin_lock_irqsave(&sock->lock, flags);
1007         if (host->req) {
1008                 writel(TIFM_FIFO_INT_SETALL,
1009                        sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
1010                 writel(0, sock->addr + SOCK_DMA_FIFO_INT_ENABLE_SET);
1011                 host->req->cmd->error = -ENOMEDIUM;
1012                 if (host->req->stop)
1013                         host->req->stop->error = -ENOMEDIUM;
1014                 tasklet_schedule(&host->finish_tasklet);
1015         }
1016         spin_unlock_irqrestore(&sock->lock, flags);
1017         mmc_remove_host(mmc);
1018         dev_dbg(&sock->dev, "after remove\n");
1019
1020         mmc_free_host(mmc);
1021 }
1022
1023 #ifdef CONFIG_PM
1024
1025 static int tifm_sd_suspend(struct tifm_dev *sock, pm_message_t state)
1026 {
1027         return 0;
1028 }
1029
1030 static int tifm_sd_resume(struct tifm_dev *sock)
1031 {
1032         struct mmc_host *mmc = tifm_get_drvdata(sock);
1033         struct tifm_sd *host = mmc_priv(mmc);
1034         int rc;
1035
1036         rc = tifm_sd_initialize_host(host);
1037         dev_dbg(&sock->dev, "resume initialize %d\n", rc);
1038
1039         if (rc)
1040                 host->eject = 1;
1041
1042         return rc;
1043 }
1044
1045 #else
1046
1047 #define tifm_sd_suspend NULL
1048 #define tifm_sd_resume NULL
1049
1050 #endif /* CONFIG_PM */
1051
1052 static struct tifm_device_id tifm_sd_id_tbl[] = {
1053         { TIFM_TYPE_SD }, { }
1054 };
1055
1056 static struct tifm_driver tifm_sd_driver = {
1057         .driver = {
1058                 .name  = DRIVER_NAME,
1059                 .owner = THIS_MODULE
1060         },
1061         .id_table = tifm_sd_id_tbl,
1062         .probe    = tifm_sd_probe,
1063         .remove   = tifm_sd_remove,
1064         .suspend  = tifm_sd_suspend,
1065         .resume   = tifm_sd_resume
1066 };
1067
1068 static int __init tifm_sd_init(void)
1069 {
1070         return tifm_register_driver(&tifm_sd_driver);
1071 }
1072
1073 static void __exit tifm_sd_exit(void)
1074 {
1075         tifm_unregister_driver(&tifm_sd_driver);
1076 }
1077
1078 MODULE_AUTHOR("Alex Dubov");
1079 MODULE_DESCRIPTION("TI FlashMedia SD driver");
1080 MODULE_LICENSE("GPL");
1081 MODULE_DEVICE_TABLE(tifm, tifm_sd_id_tbl);
1082 MODULE_VERSION(DRIVER_VERSION);
1083
1084 module_init(tifm_sd_init);
1085 module_exit(tifm_sd_exit);