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   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 <asm/io.h>
  20
  21 #define DRIVER_NAME "tifm_sd"
  22 #define DRIVER_VERSION "0.8"
  23
  24 static int no_dma = 0;
  25 static int fixed_timeout = 0;
  26 module_param(no_dma, bool, 0644);
  27 module_param(fixed_timeout, bool, 0644);
  28
  29 /* Constants here are mostly from OMAP5912 datasheet */
  30 #define TIFM_MMCSD_RESET      0x0002
  31 #define TIFM_MMCSD_CLKMASK    0x03ff
  32 #define TIFM_MMCSD_POWER      0x0800
  33 #define TIFM_MMCSD_4BBUS      0x8000
  34 #define TIFM_MMCSD_RXDE       0x8000   /* rx dma enable */
  35 #define TIFM_MMCSD_TXDE       0x0080   /* tx dma enable */
  36 #define TIFM_MMCSD_BUFINT     0x0c00   /* set bits: AE, AF */
  37 #define TIFM_MMCSD_DPE        0x0020   /* data timeout counted in kilocycles */
  38 #define TIFM_MMCSD_INAB       0x0080   /* abort / initialize command */
  39 #define TIFM_MMCSD_READ       0x8000
  40
  41 #define TIFM_MMCSD_ERRMASK    0x01e0   /* set bits: CCRC, CTO, DCRC, DTO */
  42 #define TIFM_MMCSD_EOC        0x0001   /* end of command phase  */
  43 #define TIFM_MMCSD_CD         0x0002   /* card detect           */
  44 #define TIFM_MMCSD_CB         0x0004   /* card enter busy state */
  45 #define TIFM_MMCSD_BRS        0x0008   /* block received/sent   */
  46 #define TIFM_MMCSD_EOFB       0x0010   /* card exit busy state  */
  47 #define TIFM_MMCSD_DTO        0x0020   /* data time-out         */
  48 #define TIFM_MMCSD_DCRC       0x0040   /* data crc error        */
  49 #define TIFM_MMCSD_CTO        0x0080   /* command time-out      */
  50 #define TIFM_MMCSD_CCRC       0x0100   /* command crc error     */
  51 #define TIFM_MMCSD_AF         0x0400   /* fifo almost full      */
  52 #define TIFM_MMCSD_AE         0x0800   /* fifo almost empty     */
  53 #define TIFM_MMCSD_OCRB       0x1000   /* OCR busy              */
  54 #define TIFM_MMCSD_CIRQ       0x2000   /* card irq (cmd40/sdio) */
  55 #define TIFM_MMCSD_CERR       0x4000   /* card status error     */
  56
  57 #define TIFM_MMCSD_ODTO       0x0040   /* open drain / extended timeout */
  58 #define TIFM_MMCSD_CARD_RO    0x0200   /* card is read-only     */
  59
  60 #define TIFM_MMCSD_FIFO_SIZE  0x0020
  61
  62 #define TIFM_MMCSD_RSP_R0     0x0000
  63 #define TIFM_MMCSD_RSP_R1     0x0100
  64 #define TIFM_MMCSD_RSP_R2     0x0200
  65 #define TIFM_MMCSD_RSP_R3     0x0300
  66 #define TIFM_MMCSD_RSP_R4     0x0400
  67 #define TIFM_MMCSD_RSP_R5     0x0500
  68 #define TIFM_MMCSD_RSP_R6     0x0600
  69
  70 #define TIFM_MMCSD_RSP_BUSY   0x0800
  71
  72 #define TIFM_MMCSD_CMD_BC     0x0000
  73 #define TIFM_MMCSD_CMD_BCR    0x1000
  74 #define TIFM_MMCSD_CMD_AC     0x2000
  75 #define TIFM_MMCSD_CMD_ADTC   0x3000
  76
  77 #define TIFM_MMCSD_MAX_BLOCK_SIZE  0x0800UL
  78
  79 enum {
  80         CMD_READY    = 0x0001,
  81         FIFO_READY   = 0x0002,
  82         BRS_READY    = 0x0004,
  83         SCMD_ACTIVE  = 0x0008,
  84         SCMD_READY   = 0x0010,
  85         CARD_BUSY    = 0x0020,
  86         DATA_CARRY   = 0x0040
  87 };
  88
  89 struct tifm_sd {
  90         struct tifm_dev       *dev;
  91
  92         unsigned short        eject:1,
  93                               open_drain:1,
  94                               no_dma:1;
  95         unsigned short        cmd_flags;
  96
  97         unsigned int          clk_freq;
  98         unsigned int          clk_div;
  99         unsigned long         timeout_jiffies;
 100
 101         struct tasklet_struct finish_tasklet;
 102         struct timer_list     timer;
 103         struct mmc_request    *req;
 104
 105         int                   sg_len;
 106         int                   sg_pos;
 107         unsigned int          block_pos;
 108         struct scatterlist    bounce_buf;
 109         unsigned char         bounce_buf_data[TIFM_MMCSD_MAX_BLOCK_SIZE];
 110 };
 111
 112 /* for some reason, host won't respond correctly to readw/writew */
 113 static void tifm_sd_read_fifo(struct tifm_sd *host, struct page *pg,
 114                               unsigned int off, unsigned int cnt)
 115 {
 116         struct tifm_dev *sock = host->dev;
 117         unsigned char *buf;
 118         unsigned int pos = 0, val;
 119
 120         buf = kmap_atomic(pg, KM_BIO_DST_IRQ) + off;
 121         if (host->cmd_flags & DATA_CARRY) {
 122                 buf[pos++] = host->bounce_buf_data[0];
 123                 host->cmd_flags &= ~DATA_CARRY;
 124         }
 125
 126         while (pos < cnt) {
 127                 val = readl(sock->addr + SOCK_MMCSD_DATA);
 128                 buf[pos++] = val & 0xff;
 129                 if (pos == cnt) {
 130                         host->bounce_buf_data[0] = (val >> 8) & 0xff;
 131                         host->cmd_flags |= DATA_CARRY;
 132                         break;
 133                 }
 134                 buf[pos++] = (val >> 8) & 0xff;
 135         }
 136         kunmap_atomic(buf - off, KM_BIO_DST_IRQ);
 137 }
 138
 139 static void tifm_sd_write_fifo(struct tifm_sd *host, struct page *pg,
 140                                unsigned int off, unsigned int cnt)
 141 {
 142         struct tifm_dev *sock = host->dev;
 143         unsigned char *buf;
 144         unsigned int pos = 0, val;
 145
 146         buf = kmap_atomic(pg, KM_BIO_SRC_IRQ) + off;
 147         if (host->cmd_flags & DATA_CARRY) {
 148                 val = host->bounce_buf_data[0] | ((buf[pos++] << 8) & 0xff00);
 149                 writel(val, sock->addr + SOCK_MMCSD_DATA);
 150                 host->cmd_flags &= ~DATA_CARRY;
 151         }
 152
 153         while (pos < cnt) {
 154                 val = buf[pos++];
 155                 if (pos == cnt) {
 156                         host->bounce_buf_data[0] = val & 0xff;
 157                         host->cmd_flags |= DATA_CARRY;
 158                         break;
 159                 }
 160                 val |= (buf[pos++] << 8) & 0xff00;
 161                 writel(val, sock->addr + SOCK_MMCSD_DATA);
 162         }
 163         kunmap_atomic(buf - off, KM_BIO_SRC_IRQ);
 164 }
 165
 166 static void tifm_sd_transfer_data(struct tifm_sd *host)
 167 {
 168         struct mmc_data *r_data = host->req->cmd->data;
 169         struct scatterlist *sg = r_data->sg;
 170         unsigned int off, cnt, t_size = TIFM_MMCSD_FIFO_SIZE * 2;
 171         unsigned int p_off, p_cnt;
 172         struct page *pg;
 173
 174         if (host->sg_pos == host->sg_len)
 175                 return;
 176         while (t_size) {
 177                 cnt = sg[host->sg_pos].length - host->block_pos;
 178                 if (!cnt) {
 179                         host->block_pos = 0;
 180                         host->sg_pos++;
 181                         if (host->sg_pos == host->sg_len) {
 182                                 if ((r_data->flags & MMC_DATA_WRITE)
 183                                     && (host->cmd_flags & DATA_CARRY))
 184                                         writel(host->bounce_buf_data[0],
 185                                                host->dev->addr
 186                                                + SOCK_MMCSD_DATA);
 187
 188                                 return;
 189                         }
 190                         cnt = sg[host->sg_pos].length;
 191                 }
 192                 off = sg[host->sg_pos].offset + host->block_pos;
 193
 194                 pg = nth_page(sg_page(&sg[host->sg_pos]), off >> PAGE_SHIFT);
 195                 p_off = offset_in_page(off);
 196                 p_cnt = PAGE_SIZE - p_off;
 197                 p_cnt = min(p_cnt, cnt);
 198                 p_cnt = min(p_cnt, t_size);
 199
 200                 if (r_data->flags & MMC_DATA_READ)
 201                         tifm_sd_read_fifo(host, pg, p_off, p_cnt);
 202                 else if (r_data->flags & MMC_DATA_WRITE)
 203                         tifm_sd_write_fifo(host, pg, p_off, p_cnt);
 204
 205                 t_size -= p_cnt;
 206                 host->block_pos += p_cnt;
 207         }
 208 }
 209
 210 static void tifm_sd_copy_page(struct page *dst, unsigned int dst_off,
 211                               struct page *src, unsigned int src_off,
 212                               unsigned int count)
 213 {
 214         unsigned char *src_buf = kmap_atomic(src, KM_BIO_SRC_IRQ) + src_off;
 215         unsigned char *dst_buf = kmap_atomic(dst, KM_BIO_DST_IRQ) + dst_off;
 216
 217         memcpy(dst_buf, src_buf, count);
 218
 219         kunmap_atomic(dst_buf - dst_off, KM_BIO_DST_IRQ);
 220         kunmap_atomic(src_buf - src_off, KM_BIO_SRC_IRQ);
 221 }
 222
 223 static void tifm_sd_bounce_block(struct tifm_sd *host, struct mmc_data *r_data)
 224 {
 225         struct scatterlist *sg = r_data->sg;
 226         unsigned int t_size = r_data->blksz;
 227         unsigned int off, cnt;
 228         unsigned int p_off, p_cnt;
 229         struct page *pg;
 230
 231         dev_dbg(&host->dev->dev, "bouncing block\n");
 232         while (t_size) {
 233                 cnt = sg[host->sg_pos].length - host->block_pos;
 234                 if (!cnt) {
 235                         host->block_pos = 0;
 236                         host->sg_pos++;
 237                         if (host->sg_pos == host->sg_len)
 238                                 return;
 239                         cnt = sg[host->sg_pos].length;
 240                 }
 241                 off = sg[host->sg_pos].offset + host->block_pos;
 242
 243                 pg = nth_page(sg_page(&sg[host->sg_pos]), off >> PAGE_SHIFT);
 244                 p_off = offset_in_page(off);
 245                 p_cnt = PAGE_SIZE - p_off;
 246                 p_cnt = min(p_cnt, cnt);
 247                 p_cnt = min(p_cnt, t_size);
 248
 249                 if (r_data->flags & MMC_DATA_WRITE)
 250                         tifm_sd_copy_page(sg_page(&host->bounce_buf),
 251                                           r_data->blksz - t_size,
 252                                           pg, p_off, p_cnt);
 253                 else if (r_data->flags & MMC_DATA_READ)
 254                         tifm_sd_copy_page(pg, p_off, sg_page(&host->bounce_buf),
 255                                           r_data->blksz - t_size, p_cnt);
 256
 257                 t_size -= p_cnt;
 258                 host->block_pos += p_cnt;
 259         }
 260 }
 261
 262 static int tifm_sd_set_dma_data(struct tifm_sd *host, struct mmc_data *r_data)
 263 {
 264         struct tifm_dev *sock = host->dev;
 265         unsigned int t_size = TIFM_DMA_TSIZE * r_data->blksz;
 266         unsigned int dma_len, dma_blk_cnt, dma_off;
 267         struct scatterlist *sg = NULL;
 268         unsigned long flags;
 269
 270         if (host->sg_pos == host->sg_len)
 271                 return 1;
 272
 273         if (host->cmd_flags & DATA_CARRY) {
 274                 host->cmd_flags &= ~DATA_CARRY;
 275                 local_irq_save(flags);
 276                 tifm_sd_bounce_block(host, r_data);
 277                 local_irq_restore(flags);
 278                 if (host->sg_pos == host->sg_len)
 279                         return 1;
 280         }
 281
 282         dma_len = sg_dma_len(&r_data->sg[host->sg_pos]) - host->block_pos;
 283         if (!dma_len) {
 284                 host->block_pos = 0;
 285                 host->sg_pos++;
 286                 if (host->sg_pos == host->sg_len)
 287                         return 1;
 288                 dma_len = sg_dma_len(&r_data->sg[host->sg_pos]);
 289         }
 290
 291         if (dma_len < t_size) {
 292                 dma_blk_cnt = dma_len / r_data->blksz;
 293                 dma_off = host->block_pos;
 294                 host->block_pos += dma_blk_cnt * r_data->blksz;
 295         } else {
 296                 dma_blk_cnt = TIFM_DMA_TSIZE;
 297                 dma_off = host->block_pos;
 298                 host->block_pos += t_size;
 299         }
 300
 301         if (dma_blk_cnt)
 302                 sg = &r_data->sg[host->sg_pos];
 303         else if (dma_len) {
 304                 if (r_data->flags & MMC_DATA_WRITE) {
 305                         local_irq_save(flags);
 306                         tifm_sd_bounce_block(host, r_data);
 307                         local_irq_restore(flags);
 308                 } else
 309                         host->cmd_flags |= DATA_CARRY;
 310
 311                 sg = &host->bounce_buf;
 312                 dma_off = 0;
 313                 dma_blk_cnt = 1;
 314         } else
 315                 return 1;
 316
 317         dev_dbg(&sock->dev, "setting dma for %d blocks\n", dma_blk_cnt);
 318         writel(sg_dma_address(sg) + dma_off, sock->addr + SOCK_DMA_ADDRESS);
 319         if (r_data->flags & MMC_DATA_WRITE)
 320                 writel((dma_blk_cnt << 8) | TIFM_DMA_TX | TIFM_DMA_EN,
 321                        sock->addr + SOCK_DMA_CONTROL);
 322         else
 323                 writel((dma_blk_cnt << 8) | TIFM_DMA_EN,
 324                        sock->addr + SOCK_DMA_CONTROL);
 325
 326         return 0;
 327 }
 328
 329 static unsigned int tifm_sd_op_flags(struct mmc_command *cmd)
 330 {
 331         unsigned int rc = 0;
 332
 333         switch (mmc_resp_type(cmd)) {
 334         case MMC_RSP_NONE:
 335                 rc |= TIFM_MMCSD_RSP_R0;
 336                 break;
 337         case MMC_RSP_R1B:
 338                 rc |= TIFM_MMCSD_RSP_BUSY; // deliberate fall-through
 339         case MMC_RSP_R1:
 340                 rc |= TIFM_MMCSD_RSP_R1;
 341                 break;
 342         case MMC_RSP_R2:
 343                 rc |= TIFM_MMCSD_RSP_R2;
 344                 break;
 345         case MMC_RSP_R3:
 346                 rc |= TIFM_MMCSD_RSP_R3;
 347                 break;
 348         default:
 349                 BUG();
 350         }
 351
 352         switch (mmc_cmd_type(cmd)) {
 353         case MMC_CMD_BC:
 354                 rc |= TIFM_MMCSD_CMD_BC;
 355                 break;
 356         case MMC_CMD_BCR:
 357                 rc |= TIFM_MMCSD_CMD_BCR;
 358                 break;
 359         case MMC_CMD_AC:
 360                 rc |= TIFM_MMCSD_CMD_AC;
 361                 break;
 362         case MMC_CMD_ADTC:
 363                 rc |= TIFM_MMCSD_CMD_ADTC;
 364                 break;
 365         default:
 366                 BUG();
 367         }
 368         return rc;
 369 }
 370
 371 static void tifm_sd_exec(struct tifm_sd *host, struct mmc_command *cmd)
 372 {
 373         struct tifm_dev *sock = host->dev;
 374         unsigned int cmd_mask = tifm_sd_op_flags(cmd);
 375
 376         if (host->open_drain)
 377                 cmd_mask |= TIFM_MMCSD_ODTO;
 378
 379         if (cmd->data && (cmd->data->flags & MMC_DATA_READ))
 380                 cmd_mask |= TIFM_MMCSD_READ;
 381
 382         dev_dbg(&sock->dev, "executing opcode 0x%x, arg: 0x%x, mask: 0x%x\n",
 383                 cmd->opcode, cmd->arg, cmd_mask);
 384
 385         writel((cmd->arg >> 16) & 0xffff, sock->addr + SOCK_MMCSD_ARG_HIGH);
 386         writel(cmd->arg & 0xffff, sock->addr + SOCK_MMCSD_ARG_LOW);
 387         writel(cmd->opcode | cmd_mask, sock->addr + SOCK_MMCSD_COMMAND);
 388 }
 389
 390 static void tifm_sd_fetch_resp(struct mmc_command *cmd, struct tifm_dev *sock)
 391 {
 392         cmd->resp[0] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x1c) << 16)
 393                        | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x18);
 394         cmd->resp[1] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x14) << 16)
 395                        | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x10);
 396         cmd->resp[2] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x0c) << 16)
 397                        | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x08);
 398         cmd->resp[3] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x04) << 16)
 399                        | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x00);
 400 }
 401
 402 static void tifm_sd_check_status(struct tifm_sd *host)
 403 {
 404         struct tifm_dev *sock = host->dev;
 405         struct mmc_command *cmd = host->req->cmd;
 406
 407         if (cmd->error)
 408                 goto finish_request;
 409
 410         if (!(host->cmd_flags & CMD_READY))
 411                 return;
 412
 413         if (cmd->data) {
 414                 if (cmd->data->error) {
 415                         if ((host->cmd_flags & SCMD_ACTIVE)
 416                             && !(host->cmd_flags & SCMD_READY))
 417                                 return;
 418
 419                         goto finish_request;
 420                 }
 421
 422                 if (!(host->cmd_flags & BRS_READY))
 423                         return;
 424
 425                 if (!(host->no_dma || (host->cmd_flags & FIFO_READY)))
 426                         return;
 427
 428                 if (cmd->data->flags & MMC_DATA_WRITE) {
 429                         if (host->req->stop) {
 430                                 if (!(host->cmd_flags & SCMD_ACTIVE)) {
 431                                         host->cmd_flags |= SCMD_ACTIVE;
 432                                         writel(TIFM_MMCSD_EOFB
 433                                                | readl(sock->addr
 434                                                        + SOCK_MMCSD_INT_ENABLE),
 435                                                sock->addr
 436                                                + SOCK_MMCSD_INT_ENABLE);
 437                                         tifm_sd_exec(host, host->req->stop);
 438                                         return;
 439                                 } else {
 440                                         if (!(host->cmd_flags & SCMD_READY)
 441                                             || (host->cmd_flags & CARD_BUSY))
 442                                                 return;
 443                                         writel((~TIFM_MMCSD_EOFB)
 444                                                & readl(sock->addr
 445                                                        + SOCK_MMCSD_INT_ENABLE),
 446                                                sock->addr
 447                                                + SOCK_MMCSD_INT_ENABLE);
 448                                 }
 449                         } else {
 450                                 if (host->cmd_flags & CARD_BUSY)
 451                                         return;
 452                                 writel((~TIFM_MMCSD_EOFB)
 453                                        & readl(sock->addr
 454                                                + SOCK_MMCSD_INT_ENABLE),
 455                                        sock->addr + SOCK_MMCSD_INT_ENABLE);
 456                         }
 457                 } else {
 458                         if (host->req->stop) {
 459                                 if (!(host->cmd_flags & SCMD_ACTIVE)) {
 460                                         host->cmd_flags |= SCMD_ACTIVE;
 461                                         tifm_sd_exec(host, host->req->stop);
 462                                         return;
 463                                 } else {
 464                                         if (!(host->cmd_flags & SCMD_READY))
 465                                                 return;
 466                                 }
 467                         }
 468                 }
 469         }
 470 finish_request:
 471         tasklet_schedule(&host->finish_tasklet);
 472 }
 473
 474 /* Called from interrupt handler */
 475 static void tifm_sd_data_event(struct tifm_dev *sock)
 476 {
 477         struct tifm_sd *host;
 478         unsigned int fifo_status = 0;
 479         struct mmc_data *r_data = NULL;
 480
 481         spin_lock(&sock->lock);
 482         host = mmc_priv((struct mmc_host*)tifm_get_drvdata(sock));
 483         fifo_status = readl(sock->addr + SOCK_DMA_FIFO_STATUS);
 484         dev_dbg(&sock->dev, "data event: fifo_status %x, flags %x\n",
 485                 fifo_status, host->cmd_flags);
 486
 487         if (host->req) {
 488                 r_data = host->req->cmd->data;
 489
 490                 if (r_data && (fifo_status & TIFM_FIFO_READY)) {
 491                         if (tifm_sd_set_dma_data(host, r_data)) {
 492                                 host->cmd_flags |= FIFO_READY;
 493                                 tifm_sd_check_status(host);
 494                         }
 495                 }
 496         }
 497
 498         writel(fifo_status, sock->addr + SOCK_DMA_FIFO_STATUS);
 499         spin_unlock(&sock->lock);
 500 }
 501
 502 /* Called from interrupt handler */
 503 static void tifm_sd_card_event(struct tifm_dev *sock)
 504 {
 505         struct tifm_sd *host;
 506         unsigned int host_status = 0;
 507         int cmd_error = 0;
 508         struct mmc_command *cmd = NULL;
 509         unsigned long flags;
 510
 511         spin_lock(&sock->lock);
 512         host = mmc_priv((struct mmc_host*)tifm_get_drvdata(sock));
 513         host_status = readl(sock->addr + SOCK_MMCSD_STATUS);
 514         dev_dbg(&sock->dev, "host event: host_status %x, flags %x\n",
 515                 host_status, host->cmd_flags);
 516
 517         if (host->req) {
 518                 cmd = host->req->cmd;
 519
 520                 if (host_status & TIFM_MMCSD_ERRMASK) {
 521                         writel(host_status & TIFM_MMCSD_ERRMASK,
 522                                sock->addr + SOCK_MMCSD_STATUS);
 523                         if (host_status & TIFM_MMCSD_CTO)
 524                                 cmd_error = -ETIMEDOUT;
 525                         else if (host_status & TIFM_MMCSD_CCRC)
 526                                 cmd_error = -EILSEQ;
 527
 528                         if (cmd->data) {
 529                                 if (host_status & TIFM_MMCSD_DTO)
 530                                         cmd->data->error = -ETIMEDOUT;
 531                                 else if (host_status & TIFM_MMCSD_DCRC)
 532                                         cmd->data->error = -EILSEQ;
 533                         }
 534
 535                         writel(TIFM_FIFO_INT_SETALL,
 536                                sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
 537                         writel(TIFM_DMA_RESET, sock->addr + SOCK_DMA_CONTROL);
 538
 539                         if (host->req->stop) {
 540                                 if (host->cmd_flags & SCMD_ACTIVE) {
 541                                         host->req->stop->error = cmd_error;
 542                                         host->cmd_flags |= SCMD_READY;
 543                                 } else {
 544                                         cmd->error = cmd_error;
 545                                         host->cmd_flags |= SCMD_ACTIVE;
 546                                         tifm_sd_exec(host, host->req->stop);
 547                                         goto done;
 548                                 }
 549                         } else
 550                                 cmd->error = cmd_error;
 551                 } else {
 552                         if (host_status & (TIFM_MMCSD_EOC | TIFM_MMCSD_CERR)) {
 553                                 if (!(host->cmd_flags & CMD_READY)) {
 554                                         host->cmd_flags |= CMD_READY;
 555                                         tifm_sd_fetch_resp(cmd, sock);
 556                                 } else if (host->cmd_flags & SCMD_ACTIVE) {
 557                                         host->cmd_flags |= SCMD_READY;
 558                                         tifm_sd_fetch_resp(host->req->stop,
 559                                                            sock);
 560                                 }
 561                         }
 562                         if (host_status & TIFM_MMCSD_BRS)
 563                                 host->cmd_flags |= BRS_READY;
 564                 }
 565
 566                 if (host->no_dma && cmd->data) {
 567                         if (host_status & TIFM_MMCSD_AE)
 568                                 writel(host_status & TIFM_MMCSD_AE,
 569                                        sock->addr + SOCK_MMCSD_STATUS);
 570
 571                         if (host_status & (TIFM_MMCSD_AE | TIFM_MMCSD_AF
 572                                            | TIFM_MMCSD_BRS)) {
 573                                 local_irq_save(flags);
 574                                 tifm_sd_transfer_data(host);
 575                                 local_irq_restore(flags);
 576                                 host_status &= ~TIFM_MMCSD_AE;
 577                         }
 578                 }
 579
 580                 if (host_status & TIFM_MMCSD_EOFB)
 581                         host->cmd_flags &= ~CARD_BUSY;
 582                 else if (host_status & TIFM_MMCSD_CB)
 583                         host->cmd_flags |= CARD_BUSY;
 584
 585                 tifm_sd_check_status(host);
 586         }
 587 done:
 588         writel(host_status, sock->addr + SOCK_MMCSD_STATUS);
 589         spin_unlock(&sock->lock);
 590 }
 591
 592 static void tifm_sd_set_data_timeout(struct tifm_sd *host,
 593                                      struct mmc_data *data)
 594 {
 595         struct tifm_dev *sock = host->dev;
 596         unsigned int data_timeout = data->timeout_clks;
 597
 598         if (fixed_timeout)
 599                 return;
 600
 601         data_timeout += data->timeout_ns /
 602                         ((1000000000UL / host->clk_freq) * host->clk_div);
 603
 604         if (data_timeout < 0xffff) {
 605                 writel(data_timeout, sock->addr + SOCK_MMCSD_DATA_TO);
 606                 writel((~TIFM_MMCSD_DPE)
 607                        & readl(sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG),
 608                        sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG);
 609         } else {
 610                 data_timeout = (data_timeout >> 10) + 1;
 611                 if (data_timeout > 0xffff)
 612                         data_timeout = 0;       /* set to unlimited */
 613                 writel(data_timeout, sock->addr + SOCK_MMCSD_DATA_TO);
 614                 writel(TIFM_MMCSD_DPE
 615                        | readl(sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG),
 616                        sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG);
 617         }
 618 }
 619
 620 static void tifm_sd_request(struct mmc_host *mmc, struct mmc_request *mrq)
 621 {
 622         struct tifm_sd *host = mmc_priv(mmc);
 623         struct tifm_dev *sock = host->dev;
 624         unsigned long flags;
 625         struct mmc_data *r_data = mrq->cmd->data;
 626
 627         spin_lock_irqsave(&sock->lock, flags);
 628         if (host->eject) {
 629                 mrq->cmd->error = -ENOMEDIUM;
 630                 goto err_out;
 631         }
 632
 633         if (host->req) {
 634                 printk(KERN_ERR "%s : unfinished request detected\n",
 635                        dev_name(&sock->dev));
 636                 mrq->cmd->error = -ETIMEDOUT;
 637                 goto err_out;
 638         }
 639
 640         host->cmd_flags = 0;
 641         host->block_pos = 0;
 642         host->sg_pos = 0;
 643
 644         if (mrq->data && !is_power_of_2(mrq->data->blksz))
 645                 host->no_dma = 1;
 646         else
 647                 host->no_dma = no_dma ? 1 : 0;
 648
 649         if (r_data) {
 650                 tifm_sd_set_data_timeout(host, r_data);
 651
 652                 if ((r_data->flags & MMC_DATA_WRITE) && !mrq->stop)
 653                          writel(TIFM_MMCSD_EOFB
 654                                 | readl(sock->addr + SOCK_MMCSD_INT_ENABLE),
 655                                 sock->addr + SOCK_MMCSD_INT_ENABLE);
 656
 657                 if (host->no_dma) {
 658                         writel(TIFM_MMCSD_BUFINT
 659                                | readl(sock->addr + SOCK_MMCSD_INT_ENABLE),
 660                                sock->addr + SOCK_MMCSD_INT_ENABLE);
 661                         writel(((TIFM_MMCSD_FIFO_SIZE - 1) << 8)
 662                                | (TIFM_MMCSD_FIFO_SIZE - 1),
 663                                sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
 664
 665                         host->sg_len = r_data->sg_len;
 666                 } else {
 667                         sg_init_one(&host->bounce_buf, host->bounce_buf_data,
 668                                     r_data->blksz);
 669
 670                         if(1 != tifm_map_sg(sock, &host->bounce_buf, 1,
 671                                             r_data->flags & MMC_DATA_WRITE
 672                                             ? PCI_DMA_TODEVICE
 673                                             : PCI_DMA_FROMDEVICE)) {
 674                                 printk(KERN_ERR "%s : scatterlist map failed\n",
 675                                        dev_name(&sock->dev));
 676                                 mrq->cmd->error = -ENOMEM;
 677                                 goto err_out;
 678                         }
 679                         host->sg_len = tifm_map_sg(sock, r_data->sg,
 680                                                    r_data->sg_len,
 681                                                    r_data->flags
 682                                                    & MMC_DATA_WRITE
 683                                                    ? PCI_DMA_TODEVICE
 684                                                    : PCI_DMA_FROMDEVICE);
 685                         if (host->sg_len < 1) {
 686                                 printk(KERN_ERR "%s : scatterlist map failed\n",
 687                                        dev_name(&sock->dev));
 688                                 tifm_unmap_sg(sock, &host->bounce_buf, 1,
 689                                               r_data->flags & MMC_DATA_WRITE
 690                                               ? PCI_DMA_TODEVICE
 691                                               : PCI_DMA_FROMDEVICE);
 692                                 mrq->cmd->error = -ENOMEM;
 693                                 goto err_out;
 694                         }
 695
 696                         writel(TIFM_FIFO_INT_SETALL,
 697                                sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
 698                         writel(ilog2(r_data->blksz) - 2,
 699                                sock->addr + SOCK_FIFO_PAGE_SIZE);
 700                         writel(TIFM_FIFO_ENABLE,
 701                                sock->addr + SOCK_FIFO_CONTROL);
 702                         writel(TIFM_FIFO_INTMASK,
 703                                sock->addr + SOCK_DMA_FIFO_INT_ENABLE_SET);
 704
 705                         if (r_data->flags & MMC_DATA_WRITE)
 706                                 writel(TIFM_MMCSD_TXDE,
 707                                        sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
 708                         else
 709                                 writel(TIFM_MMCSD_RXDE,
 710                                        sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
 711
 712                         tifm_sd_set_dma_data(host, r_data);
 713                 }
 714
 715                 writel(r_data->blocks - 1,
 716                        sock->addr + SOCK_MMCSD_NUM_BLOCKS);
 717                 writel(r_data->blksz - 1,
 718                        sock->addr + SOCK_MMCSD_BLOCK_LEN);
 719         }
 720
 721         host->req = mrq;
 722         mod_timer(&host->timer, jiffies + host->timeout_jiffies);
 723         writel(TIFM_CTRL_LED | readl(sock->addr + SOCK_CONTROL),
 724                sock->addr + SOCK_CONTROL);
 725         tifm_sd_exec(host, mrq->cmd);
 726         spin_unlock_irqrestore(&sock->lock, flags);
 727         return;
 728
 729 err_out:
 730         spin_unlock_irqrestore(&sock->lock, flags);
 731         mmc_request_done(mmc, mrq);
 732 }
 733
 734 static void tifm_sd_end_cmd(unsigned long data)
 735 {
 736         struct tifm_sd *host = (struct tifm_sd*)data;
 737         struct tifm_dev *sock = host->dev;
 738         struct mmc_host *mmc = tifm_get_drvdata(sock);
 739         struct mmc_request *mrq;
 740         struct mmc_data *r_data = NULL;
 741         unsigned long flags;
 742
 743         spin_lock_irqsave(&sock->lock, flags);
 744
 745         del_timer(&host->timer);
 746         mrq = host->req;
 747         host->req = NULL;
 748
 749         if (!mrq) {
 750                 printk(KERN_ERR " %s : no request to complete?\n",
 751                        dev_name(&sock->dev));
 752                 spin_unlock_irqrestore(&sock->lock, flags);
 753                 return;
 754         }
 755
 756         r_data = mrq->cmd->data;
 757         if (r_data) {
 758                 if (host->no_dma) {
 759                         writel((~TIFM_MMCSD_BUFINT)
 760                                & readl(sock->addr + SOCK_MMCSD_INT_ENABLE),
 761                                sock->addr + SOCK_MMCSD_INT_ENABLE);
 762                 } else {
 763                         tifm_unmap_sg(sock, &host->bounce_buf, 1,
 764                                       (r_data->flags & MMC_DATA_WRITE)
 765                                       ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
 766                         tifm_unmap_sg(sock, r_data->sg, r_data->sg_len,
 767                                       (r_data->flags & MMC_DATA_WRITE)
 768                                       ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
 769                 }
 770
 771                 r_data->bytes_xfered = r_data->blocks
 772                         - readl(sock->addr + SOCK_MMCSD_NUM_BLOCKS) - 1;
 773                 r_data->bytes_xfered *= r_data->blksz;
 774                 r_data->bytes_xfered += r_data->blksz
 775                         - readl(sock->addr + SOCK_MMCSD_BLOCK_LEN) + 1;
 776         }
 777
 778         writel((~TIFM_CTRL_LED) & readl(sock->addr + SOCK_CONTROL),
 779                sock->addr + SOCK_CONTROL);
 780
 781         spin_unlock_irqrestore(&sock->lock, flags);
 782         mmc_request_done(mmc, mrq);
 783 }
 784
 785 static void tifm_sd_abort(unsigned long data)
 786 {
 787         struct tifm_sd *host = (struct tifm_sd*)data;
 788
 789         printk(KERN_ERR
 790                "%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                 printk(KERN_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                 printk(KERN_ERR
 935                        "%s : card not ready - probe failed on initialization\n",
 936                        dev_name(&sock->dev));
 937                 return -ENODEV;
 938         }
 939
 940         writel(TIFM_MMCSD_CERR | TIFM_MMCSD_BRS | TIFM_MMCSD_EOC
 941                | TIFM_MMCSD_ERRMASK,
 942                sock->addr + SOCK_MMCSD_INT_ENABLE);
 943         mmiowb();
 944
 945         return 0;
 946 }
 947
 948 static int tifm_sd_probe(struct tifm_dev *sock)
 949 {
 950         struct mmc_host *mmc;
 951         struct tifm_sd *host;
 952         int rc = -EIO;
 953
 954         if (!(TIFM_SOCK_STATE_OCCUPIED
 955               & readl(sock->addr + SOCK_PRESENT_STATE))) {
 956                 printk(KERN_WARNING "%s : card gone, unexpectedly\n",
 957                        dev_name(&sock->dev));
 958                 return rc;
 959         }
 960
 961         mmc = mmc_alloc_host(sizeof(struct tifm_sd), &sock->dev);
 962         if (!mmc)
 963                 return -ENOMEM;
 964
 965         host = mmc_priv(mmc);
 966         tifm_set_drvdata(sock, mmc);
 967         host->dev = sock;
 968         host->timeout_jiffies = msecs_to_jiffies(1000);
 969
 970         tasklet_init(&host->finish_tasklet, tifm_sd_end_cmd,
 971                      (unsigned long)host);
 972         setup_timer(&host->timer, tifm_sd_abort, (unsigned long)host);
 973
 974         mmc->ops = &tifm_sd_ops;
 975         mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
 976         mmc->caps = MMC_CAP_4_BIT_DATA;
 977         mmc->f_min = 20000000 / 60;
 978         mmc->f_max = 24000000;
 979
 980         mmc->max_blk_count = 2048;
 981         mmc->max_hw_segs = mmc->max_blk_count;
 982         mmc->max_blk_size = min(TIFM_MMCSD_MAX_BLOCK_SIZE, PAGE_SIZE);
 983         mmc->max_seg_size = mmc->max_blk_count * mmc->max_blk_size;
 984         mmc->max_req_size = mmc->max_seg_size;
 985         mmc->max_phys_segs = mmc->max_hw_segs;
 986
 987         sock->card_event = tifm_sd_card_event;
 988         sock->data_event = tifm_sd_data_event;
 989         rc = tifm_sd_initialize_host(host);
 990
 991         if (!rc)
 992                 rc = mmc_add_host(mmc);
 993         if (!rc)
 994                 return 0;
 995
 996         mmc_free_host(mmc);
 997         return rc;
 998 }
 999
1000 static void tifm_sd_remove(struct tifm_dev *sock)
1001 {
1002         struct mmc_host *mmc = tifm_get_drvdata(sock);
1003         struct tifm_sd *host = mmc_priv(mmc);
1004         unsigned long flags;
1005
1006         spin_lock_irqsave(&sock->lock, flags);
1007         host->eject = 1;
1008         writel(0, sock->addr + SOCK_MMCSD_INT_ENABLE);
1009         mmiowb();
1010         spin_unlock_irqrestore(&sock->lock, flags);
1011
1012         tasklet_kill(&host->finish_tasklet);
1013
1014         spin_lock_irqsave(&sock->lock, flags);
1015         if (host->req) {
1016                 writel(TIFM_FIFO_INT_SETALL,
1017                        sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
1018                 writel(0, sock->addr + SOCK_DMA_FIFO_INT_ENABLE_SET);
1019                 host->req->cmd->error = -ENOMEDIUM;
1020                 if (host->req->stop)
1021                         host->req->stop->error = -ENOMEDIUM;
1022                 tasklet_schedule(&host->finish_tasklet);
1023         }
1024         spin_unlock_irqrestore(&sock->lock, flags);
1025         mmc_remove_host(mmc);
1026         dev_dbg(&sock->dev, "after remove\n");
1027
1028         mmc_free_host(mmc);
1029 }
1030
1031 #ifdef CONFIG_PM
1032
1033 static int tifm_sd_suspend(struct tifm_dev *sock, pm_message_t state)
1034 {
1035         return mmc_suspend_host(tifm_get_drvdata(sock), state);
1036 }
1037
1038 static int tifm_sd_resume(struct tifm_dev *sock)
1039 {
1040         struct mmc_host *mmc = tifm_get_drvdata(sock);
1041         struct tifm_sd *host = mmc_priv(mmc);
1042         int rc;
1043
1044         rc = tifm_sd_initialize_host(host);
1045         dev_dbg(&sock->dev, "resume initialize %d\n", rc);
1046
1047         if (rc)
1048                 host->eject = 1;
1049         else
1050                 rc = mmc_resume_host(mmc);
1051
1052         return rc;
1053 }
1054
1055 #else
1056
1057 #define tifm_sd_suspend NULL
1058 #define tifm_sd_resume NULL
1059
1060 #endif /* CONFIG_PM */
1061
1062 static struct tifm_device_id tifm_sd_id_tbl[] = {
1063         { TIFM_TYPE_SD }, { }
1064 };
1065
1066 static struct tifm_driver tifm_sd_driver = {
1067         .driver = {
1068                 .name  = DRIVER_NAME,
1069                 .owner = THIS_MODULE
1070         },
1071         .id_table = tifm_sd_id_tbl,
1072         .probe    = tifm_sd_probe,
1073         .remove   = tifm_sd_remove,
1074         .suspend  = tifm_sd_suspend,
1075         .resume   = tifm_sd_resume
1076 };
1077
1078 static int __init tifm_sd_init(void)
1079 {
1080         return tifm_register_driver(&tifm_sd_driver);
1081 }
1082
1083 static void __exit tifm_sd_exit(void)
1084 {
1085         tifm_unregister_driver(&tifm_sd_driver);
1086 }
1087
1088 MODULE_AUTHOR("Alex Dubov");
1089 MODULE_DESCRIPTION("TI FlashMedia SD driver");
1090 MODULE_LICENSE("GPL");
1091 MODULE_DEVICE_TABLE(tifm, tifm_sd_id_tbl);
1092 MODULE_VERSION(DRIVER_VERSION);
1093
1094 module_init(tifm_sd_init);
1095 module_exit(tifm_sd_exit);