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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  */
  11
  12
  13 #include <linux/tifm.h>
  14 #include <linux/mmc/protocol.h>
  15 #include <linux/mmc/host.h>
  16 #include <linux/highmem.h>
  17 #include <asm/io.h>
  18
  19 #define DRIVER_NAME "tifm_sd"
  20 #define DRIVER_VERSION "0.7"
  21
  22 static int no_dma = 0;
  23 static int fixed_timeout = 0;
  24 module_param(no_dma, bool, 0644);
  25 module_param(fixed_timeout, bool, 0644);
  26
  27 /* Constants here are mostly from OMAP5912 datasheet */
  28 #define TIFM_MMCSD_RESET      0x0002
  29 #define TIFM_MMCSD_CLKMASK    0x03ff
  30 #define TIFM_MMCSD_POWER      0x0800
  31 #define TIFM_MMCSD_4BBUS      0x8000
  32 #define TIFM_MMCSD_RXDE       0x8000   /* rx dma enable */
  33 #define TIFM_MMCSD_TXDE       0x0080   /* tx dma enable */
  34 #define TIFM_MMCSD_BUFINT     0x0c00   /* set bits: AE, AF */
  35 #define TIFM_MMCSD_DPE        0x0020   /* data timeout counted in kilocycles */
  36 #define TIFM_MMCSD_INAB       0x0080   /* abort / initialize command */
  37 #define TIFM_MMCSD_READ       0x8000
  38
  39 #define TIFM_MMCSD_DATAMASK   0x001d   /* set bits: EOFB, BRS, CB, EOC */
  40 #define TIFM_MMCSD_ERRMASK    0x41e0   /* set bits: CERR, CCRC, CTO, DCRC, DTO */
  41 #define TIFM_MMCSD_EOC        0x0001   /* end of command phase  */
  42 #define TIFM_MMCSD_CB         0x0004   /* card enter busy state */
  43 #define TIFM_MMCSD_BRS        0x0008   /* block received/sent   */
  44 #define TIFM_MMCSD_EOFB       0x0010   /* card exit busy state  */
  45 #define TIFM_MMCSD_DTO        0x0020   /* data time-out         */
  46 #define TIFM_MMCSD_DCRC       0x0040   /* data crc error        */
  47 #define TIFM_MMCSD_CTO        0x0080   /* command time-out      */
  48 #define TIFM_MMCSD_CCRC       0x0100   /* command crc error     */
  49 #define TIFM_MMCSD_AF         0x0400   /* fifo almost full      */
  50 #define TIFM_MMCSD_AE         0x0800   /* fifo almost empty     */
  51 #define TIFM_MMCSD_CERR       0x4000   /* card status error     */
  52
  53 #define TIFM_MMCSD_FIFO_SIZE  0x0020
  54
  55 #define TIFM_MMCSD_RSP_R0     0x0000
  56 #define TIFM_MMCSD_RSP_R1     0x0100
  57 #define TIFM_MMCSD_RSP_R2     0x0200
  58 #define TIFM_MMCSD_RSP_R3     0x0300
  59 #define TIFM_MMCSD_RSP_R4     0x0400
  60 #define TIFM_MMCSD_RSP_R5     0x0500
  61 #define TIFM_MMCSD_RSP_R6     0x0600
  62
  63 #define TIFM_MMCSD_RSP_BUSY   0x0800
  64
  65 #define TIFM_MMCSD_CMD_BC     0x0000
  66 #define TIFM_MMCSD_CMD_BCR    0x1000
  67 #define TIFM_MMCSD_CMD_AC     0x2000
  68 #define TIFM_MMCSD_CMD_ADTC   0x3000
  69
  70 typedef enum {
  71         IDLE = 0,
  72         CMD,    /* main command ended                   */
  73         BRS,    /* block transfer finished              */
  74         SCMD,   /* stop command ended                   */
  75         CARD,   /* card left busy state                 */
  76         FIFO,   /* FIFO operation completed (uncertain) */
  77         READY
  78 } card_state_t;
  79
  80 enum {
  81         FIFO_RDY   = 0x0001,     /* hardware dependent value */
  82         EJECT      = 0x0004,
  83         EJECT_DONE = 0x0008,
  84         CARD_BUSY  = 0x0010,
  85         OPENDRAIN  = 0x0040,     /* hardware dependent value */
  86         CARD_EVENT = 0x0100,     /* hardware dependent value */
  87         CARD_RO    = 0x0200,     /* hardware dependent value */
  88         FIFO_EVENT = 0x10000 };  /* hardware dependent value */
  89
  90 struct tifm_sd {
  91         struct tifm_dev     *dev;
  92
  93         unsigned int        flags;
  94         card_state_t        state;
  95         unsigned int        clk_freq;
  96         unsigned int        clk_div;
  97         unsigned long       timeout_jiffies;
  98
  99         struct tasklet_struct finish_tasklet;
 100         struct timer_list     timer;
 101         struct mmc_request    *req;
 102         wait_queue_head_t     notify;
 103
 104         size_t                written_blocks;
 105         size_t                buffer_size;
 106         size_t                buffer_pos;
 107
 108 };
 109
 110 static char* tifm_sd_data_buffer(struct mmc_data *data)
 111 {
 112         return page_address(data->sg->page) + data->sg->offset;
 113 }
 114
 115 static int tifm_sd_transfer_data(struct tifm_dev *sock, struct tifm_sd *host,
 116                                  unsigned int host_status)
 117 {
 118         struct mmc_command *cmd = host->req->cmd;
 119         unsigned int t_val = 0, cnt = 0;
 120         char *buffer;
 121
 122         if (host_status & TIFM_MMCSD_BRS) {
 123                 /* in non-dma rx mode BRS fires when fifo is still not empty */
 124                 if (no_dma && (cmd->data->flags & MMC_DATA_READ)) {
 125                         buffer = tifm_sd_data_buffer(host->req->data);
 126                         while (host->buffer_size > host->buffer_pos) {
 127                                 t_val = readl(sock->addr + SOCK_MMCSD_DATA);
 128                                 buffer[host->buffer_pos++] = t_val & 0xff;
 129                                 buffer[host->buffer_pos++] =
 130                                                         (t_val >> 8) & 0xff;
 131                         }
 132                 }
 133                 return 1;
 134         } else if (no_dma) {
 135                 buffer = tifm_sd_data_buffer(host->req->data);
 136                 if ((cmd->data->flags & MMC_DATA_READ) &&
 137                                 (host_status & TIFM_MMCSD_AF)) {
 138                         for (cnt = 0; cnt < TIFM_MMCSD_FIFO_SIZE; cnt++) {
 139                                 t_val = readl(sock->addr + SOCK_MMCSD_DATA);
 140                                 if (host->buffer_size > host->buffer_pos) {
 141                                         buffer[host->buffer_pos++] =
 142                                                         t_val & 0xff;
 143                                         buffer[host->buffer_pos++] =
 144                                                         (t_val >> 8) & 0xff;
 145                                 }
 146                         }
 147                 } else if ((cmd->data->flags & MMC_DATA_WRITE)
 148                            && (host_status & TIFM_MMCSD_AE)) {
 149                         for (cnt = 0; cnt < TIFM_MMCSD_FIFO_SIZE; cnt++) {
 150                                 if (host->buffer_size > host->buffer_pos) {
 151                                         t_val = buffer[host->buffer_pos++]
 152                                                 & 0x00ff;
 153                                         t_val |= ((buffer[host->buffer_pos++])
 154                                                   << 8) & 0xff00;
 155                                         writel(t_val,
 156                                                sock->addr + SOCK_MMCSD_DATA);
 157                                 }
 158                         }
 159                 }
 160         }
 161         return 0;
 162 }
 163
 164 static unsigned int tifm_sd_op_flags(struct mmc_command *cmd)
 165 {
 166         unsigned int rc = 0;
 167
 168         switch (mmc_resp_type(cmd)) {
 169         case MMC_RSP_NONE:
 170                 rc |= TIFM_MMCSD_RSP_R0;
 171                 break;
 172         case MMC_RSP_R1B:
 173                 rc |= TIFM_MMCSD_RSP_BUSY; // deliberate fall-through
 174         case MMC_RSP_R1:
 175                 rc |= TIFM_MMCSD_RSP_R1;
 176                 break;
 177         case MMC_RSP_R2:
 178                 rc |= TIFM_MMCSD_RSP_R2;
 179                 break;
 180         case MMC_RSP_R3:
 181                 rc |= TIFM_MMCSD_RSP_R3;
 182                 break;
 183         default:
 184                 BUG();
 185         }
 186
 187         switch (mmc_cmd_type(cmd)) {
 188         case MMC_CMD_BC:
 189                 rc |= TIFM_MMCSD_CMD_BC;
 190                 break;
 191         case MMC_CMD_BCR:
 192                 rc |= TIFM_MMCSD_CMD_BCR;
 193                 break;
 194         case MMC_CMD_AC:
 195                 rc |= TIFM_MMCSD_CMD_AC;
 196                 break;
 197         case MMC_CMD_ADTC:
 198                 rc |= TIFM_MMCSD_CMD_ADTC;
 199                 break;
 200         default:
 201                 BUG();
 202         }
 203         return rc;
 204 }
 205
 206 static void tifm_sd_exec(struct tifm_sd *host, struct mmc_command *cmd)
 207 {
 208         struct tifm_dev *sock = host->dev;
 209         unsigned int cmd_mask = tifm_sd_op_flags(cmd) |
 210                                 (host->flags & OPENDRAIN);
 211
 212         if (cmd->data && (cmd->data->flags & MMC_DATA_READ))
 213                 cmd_mask |= TIFM_MMCSD_READ;
 214
 215         dev_dbg(&sock->dev, "executing opcode 0x%x, arg: 0x%x, mask: 0x%x\n",
 216                 cmd->opcode, cmd->arg, cmd_mask);
 217
 218         writel((cmd->arg >> 16) & 0xffff, sock->addr + SOCK_MMCSD_ARG_HIGH);
 219         writel(cmd->arg & 0xffff, sock->addr + SOCK_MMCSD_ARG_LOW);
 220         writel(cmd->opcode | cmd_mask, sock->addr + SOCK_MMCSD_COMMAND);
 221 }
 222
 223 static void tifm_sd_fetch_resp(struct mmc_command *cmd, struct tifm_dev *sock)
 224 {
 225         cmd->resp[0] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x1c) << 16)
 226                        | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x18);
 227         cmd->resp[1] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x14) << 16)
 228                        | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x10);
 229         cmd->resp[2] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x0c) << 16)
 230                        | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x08);
 231         cmd->resp[3] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x04) << 16)
 232                        | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x00);
 233 }
 234
 235 static void tifm_sd_process_cmd(struct tifm_dev *sock, struct tifm_sd *host,
 236                                        unsigned int host_status)
 237 {
 238         struct mmc_command *cmd = host->req->cmd;
 239
 240 change_state:
 241         switch (host->state) {
 242         case IDLE:
 243                 return;
 244         case CMD:
 245                 if (host_status & TIFM_MMCSD_EOC) {
 246                         tifm_sd_fetch_resp(cmd, sock);
 247                         if (cmd->data) {
 248                                 host->state = BRS;
 249                         } else {
 250                                 host->state = READY;
 251                         }
 252                         goto change_state;
 253                 }
 254                 break;
 255         case BRS:
 256                 if (tifm_sd_transfer_data(sock, host, host_status)) {
 257                         if (cmd->data->flags & MMC_DATA_WRITE) {
 258                                 host->state = CARD;
 259                         } else {
 260                                 if (no_dma) {
 261                                         if (host->req->stop) {
 262                                                 tifm_sd_exec(host, host->req->stop);
 263                                                 host->state = SCMD;
 264                                         } else {
 265                                                 host->state = READY;
 266                                         }
 267                                 } else {
 268                                         host->state = FIFO;
 269                                 }
 270                         }
 271                         goto change_state;
 272                 }
 273                 break;
 274         case SCMD:
 275                 if (host_status & TIFM_MMCSD_EOC) {
 276                         tifm_sd_fetch_resp(host->req->stop, sock);
 277                         host->state = READY;
 278                         goto change_state;
 279                 }
 280                 break;
 281         case CARD:
 282                 dev_dbg(&sock->dev, "waiting for CARD, have %zd blocks\n",
 283                         host->written_blocks);
 284                 if (!(host->flags & CARD_BUSY)
 285                     && (host->written_blocks == cmd->data->blocks)) {
 286                         if (no_dma) {
 287                                 if (host->req->stop) {
 288                                         tifm_sd_exec(host, host->req->stop);
 289                                         host->state = SCMD;
 290                                 } else {
 291                                         host->state = READY;
 292                                 }
 293                         } else {
 294                                 host->state = FIFO;
 295                         }
 296                         goto change_state;
 297                 }
 298                 break;
 299         case FIFO:
 300                 if (host->flags & FIFO_RDY) {
 301                         host->flags &= ~FIFO_RDY;
 302                         if (host->req->stop) {
 303                                 tifm_sd_exec(host, host->req->stop);
 304                                 host->state = SCMD;
 305                         } else {
 306                                 host->state = READY;
 307                         }
 308                         goto change_state;
 309                 }
 310                 break;
 311         case READY:
 312                 tasklet_schedule(&host->finish_tasklet);
 313                 return;
 314         }
 315
 316 }
 317
 318 /* Called from interrupt handler */
 319 static void tifm_sd_signal_irq(struct tifm_dev *sock,
 320                                unsigned int sock_irq_status)
 321 {
 322         struct tifm_sd *host;
 323         unsigned int host_status = 0, fifo_status = 0;
 324         int error_code = 0;
 325
 326         spin_lock(&sock->lock);
 327         host = mmc_priv((struct mmc_host*)tifm_get_drvdata(sock));
 328
 329         if (sock_irq_status & FIFO_EVENT) {
 330                 fifo_status = readl(sock->addr + SOCK_DMA_FIFO_STATUS);
 331                 writel(fifo_status, sock->addr + SOCK_DMA_FIFO_STATUS);
 332
 333                 host->flags |= fifo_status & FIFO_RDY;
 334         }
 335
 336         if (sock_irq_status & CARD_EVENT) {
 337                 host_status = readl(sock->addr + SOCK_MMCSD_STATUS);
 338                 writel(host_status, sock->addr + SOCK_MMCSD_STATUS);
 339
 340                 if (!host->req)
 341                         goto done;
 342
 343                 if (host_status & TIFM_MMCSD_ERRMASK) {
 344                         if (host_status & TIFM_MMCSD_CERR)
 345                                 error_code = MMC_ERR_FAILED;
 346                         else if (host_status
 347                                  & (TIFM_MMCSD_CTO | TIFM_MMCSD_DTO))
 348                                 error_code = MMC_ERR_TIMEOUT;
 349                         else if (host_status
 350                                  & (TIFM_MMCSD_CCRC | TIFM_MMCSD_DCRC))
 351                                 error_code = MMC_ERR_BADCRC;
 352
 353                         writel(TIFM_FIFO_INT_SETALL,
 354                                sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
 355                         writel(TIFM_DMA_RESET, sock->addr + SOCK_DMA_CONTROL);
 356
 357                         if (host->req->stop) {
 358                                 if (host->state == SCMD) {
 359                                         host->req->stop->error = error_code;
 360                                 } else if (host->state == BRS
 361                                            || host->state == CARD
 362                                            || host->state == FIFO) {
 363                                         host->req->cmd->error = error_code;
 364                                         tifm_sd_exec(host, host->req->stop);
 365                                         host->state = SCMD;
 366                                         goto done;
 367                                 } else {
 368                                         host->req->cmd->error = error_code;
 369                                 }
 370                         } else {
 371                                 host->req->cmd->error = error_code;
 372                         }
 373                         host->state = READY;
 374                 }
 375
 376                 if (host_status & TIFM_MMCSD_CB)
 377                         host->flags |= CARD_BUSY;
 378                 if ((host_status & TIFM_MMCSD_EOFB)
 379                     && (host->flags & CARD_BUSY)) {
 380                         host->written_blocks++;
 381                         host->flags &= ~CARD_BUSY;
 382                 }
 383         }
 384
 385         if (host->req)
 386                 tifm_sd_process_cmd(sock, host, host_status);
 387 done:
 388         dev_dbg(&sock->dev, "host_status %x, fifo_status %x\n",
 389                 host_status, fifo_status);
 390         spin_unlock(&sock->lock);
 391 }
 392
 393 static void tifm_sd_prepare_data(struct tifm_sd *host, struct mmc_command *cmd)
 394 {
 395         struct tifm_dev *sock = host->dev;
 396         unsigned int dest_cnt;
 397
 398         /* DMA style IO */
 399         dev_dbg(&sock->dev, "setting dma for %d blocks\n",
 400                 cmd->data->blocks);
 401         writel(TIFM_FIFO_INT_SETALL,
 402                sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
 403         writel(ilog2(cmd->data->blksz) - 2,
 404                sock->addr + SOCK_FIFO_PAGE_SIZE);
 405         writel(TIFM_FIFO_ENABLE, sock->addr + SOCK_FIFO_CONTROL);
 406         writel(TIFM_FIFO_INTMASK, sock->addr + SOCK_DMA_FIFO_INT_ENABLE_SET);
 407
 408         dest_cnt = (cmd->data->blocks) << 8;
 409
 410         writel(sg_dma_address(cmd->data->sg), sock->addr + SOCK_DMA_ADDRESS);
 411
 412         writel(cmd->data->blocks - 1, sock->addr + SOCK_MMCSD_NUM_BLOCKS);
 413         writel(cmd->data->blksz - 1, sock->addr + SOCK_MMCSD_BLOCK_LEN);
 414
 415         if (cmd->data->flags & MMC_DATA_WRITE) {
 416                 writel(TIFM_MMCSD_TXDE, sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
 417                 writel(dest_cnt | TIFM_DMA_TX | TIFM_DMA_EN,
 418                        sock->addr + SOCK_DMA_CONTROL);
 419         } else {
 420                 writel(TIFM_MMCSD_RXDE, sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
 421                 writel(dest_cnt | TIFM_DMA_EN, sock->addr + SOCK_DMA_CONTROL);
 422         }
 423 }
 424
 425 static void tifm_sd_set_data_timeout(struct tifm_sd *host,
 426                                      struct mmc_data *data)
 427 {
 428         struct tifm_dev *sock = host->dev;
 429         unsigned int data_timeout = data->timeout_clks;
 430
 431         if (fixed_timeout)
 432                 return;
 433
 434         data_timeout += data->timeout_ns /
 435                         ((1000000000UL / host->clk_freq) * host->clk_div);
 436
 437         if (data_timeout < 0xffff) {
 438                 writel(data_timeout, sock->addr + SOCK_MMCSD_DATA_TO);
 439                 writel((~TIFM_MMCSD_DPE)
 440                        & readl(sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG),
 441                        sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG);
 442         } else {
 443                 data_timeout = (data_timeout >> 10) + 1;
 444                 if (data_timeout > 0xffff)
 445                         data_timeout = 0;       /* set to unlimited */
 446                 writel(data_timeout, sock->addr + SOCK_MMCSD_DATA_TO);
 447                 writel(TIFM_MMCSD_DPE
 448                        | readl(sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG),
 449                        sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG);
 450         }
 451 }
 452
 453 static void tifm_sd_request(struct mmc_host *mmc, struct mmc_request *mrq)
 454 {
 455         struct tifm_sd *host = mmc_priv(mmc);
 456         struct tifm_dev *sock = host->dev;
 457         unsigned long flags;
 458         int sg_count = 0;
 459         struct mmc_data *r_data = mrq->cmd->data;
 460
 461         spin_lock_irqsave(&sock->lock, flags);
 462         if (host->flags & EJECT) {
 463                 spin_unlock_irqrestore(&sock->lock, flags);
 464                 goto err_out;
 465         }
 466
 467         if (host->req) {
 468                 printk(KERN_ERR DRIVER_NAME ": unfinished request detected\n");
 469                 spin_unlock_irqrestore(&sock->lock, flags);
 470                 goto err_out;
 471         }
 472
 473         if (r_data) {
 474                 tifm_sd_set_data_timeout(host, r_data);
 475
 476                 sg_count = tifm_map_sg(sock, r_data->sg, r_data->sg_len,
 477                                        mrq->cmd->flags & MMC_DATA_WRITE
 478                                        ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
 479                 if (sg_count != 1) {
 480                         printk(KERN_ERR DRIVER_NAME
 481                                 ": scatterlist map failed\n");
 482                         spin_unlock_irqrestore(&sock->lock, flags);
 483                         goto err_out;
 484                 }
 485
 486                 host->written_blocks = 0;
 487                 host->flags &= ~CARD_BUSY;
 488                 tifm_sd_prepare_data(host, mrq->cmd);
 489         }
 490
 491         host->req = mrq;
 492         mod_timer(&host->timer, jiffies + host->timeout_jiffies);
 493         host->state = CMD;
 494         writel(TIFM_CTRL_LED | readl(sock->addr + SOCK_CONTROL),
 495                sock->addr + SOCK_CONTROL);
 496         tifm_sd_exec(host, mrq->cmd);
 497         spin_unlock_irqrestore(&sock->lock, flags);
 498         return;
 499
 500 err_out:
 501         if (sg_count > 0)
 502                 tifm_unmap_sg(sock, r_data->sg, r_data->sg_len,
 503                               (r_data->flags & MMC_DATA_WRITE)
 504                               ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
 505
 506         mrq->cmd->error = MMC_ERR_TIMEOUT;
 507         mmc_request_done(mmc, mrq);
 508 }
 509
 510 static void tifm_sd_end_cmd(unsigned long data)
 511 {
 512         struct tifm_sd *host = (struct tifm_sd*)data;
 513         struct tifm_dev *sock = host->dev;
 514         struct mmc_host *mmc = tifm_get_drvdata(sock);
 515         struct mmc_request *mrq;
 516         struct mmc_data *r_data = NULL;
 517         unsigned long flags;
 518
 519         spin_lock_irqsave(&sock->lock, flags);
 520
 521         del_timer(&host->timer);
 522         mrq = host->req;
 523         host->req = NULL;
 524         host->state = IDLE;
 525
 526         if (!mrq) {
 527                 printk(KERN_ERR DRIVER_NAME ": no request to complete?\n");
 528                 spin_unlock_irqrestore(&sock->lock, flags);
 529                 return;
 530         }
 531
 532         r_data = mrq->cmd->data;
 533         if (r_data) {
 534                 if (r_data->flags & MMC_DATA_WRITE) {
 535                         r_data->bytes_xfered = host->written_blocks
 536                                                * r_data->blksz;
 537                 } else {
 538                         r_data->bytes_xfered = r_data->blocks -
 539                                 readl(sock->addr + SOCK_MMCSD_NUM_BLOCKS) - 1;
 540                         r_data->bytes_xfered *= r_data->blksz;
 541                         r_data->bytes_xfered += r_data->blksz -
 542                                 readl(sock->addr + SOCK_MMCSD_BLOCK_LEN) + 1;
 543                 }
 544                 tifm_unmap_sg(sock, r_data->sg, r_data->sg_len,
 545                               (r_data->flags & MMC_DATA_WRITE)
 546                               ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
 547         }
 548
 549         writel((~TIFM_CTRL_LED) & readl(sock->addr + SOCK_CONTROL),
 550                sock->addr + SOCK_CONTROL);
 551
 552         spin_unlock_irqrestore(&sock->lock, flags);
 553         mmc_request_done(mmc, mrq);
 554 }
 555
 556 static void tifm_sd_request_nodma(struct mmc_host *mmc, struct mmc_request *mrq)
 557 {
 558         struct tifm_sd *host = mmc_priv(mmc);
 559         struct tifm_dev *sock = host->dev;
 560         unsigned long flags;
 561         struct mmc_data *r_data = mrq->cmd->data;
 562
 563         spin_lock_irqsave(&sock->lock, flags);
 564         if (host->flags & EJECT) {
 565                 spin_unlock_irqrestore(&sock->lock, flags);
 566                 goto err_out;
 567         }
 568
 569         if (host->req) {
 570                 printk(KERN_ERR DRIVER_NAME ": unfinished request detected\n");
 571                 spin_unlock_irqrestore(&sock->lock, flags);
 572                 goto err_out;
 573         }
 574
 575         if (r_data) {
 576                 tifm_sd_set_data_timeout(host, r_data);
 577
 578                 host->buffer_size = mrq->cmd->data->blocks
 579                                     * mrq->cmd->data->blksz;
 580
 581                 writel(TIFM_MMCSD_BUFINT
 582                        | readl(sock->addr + SOCK_MMCSD_INT_ENABLE),
 583                        sock->addr + SOCK_MMCSD_INT_ENABLE);
 584                 writel(((TIFM_MMCSD_FIFO_SIZE - 1) << 8)
 585                        | (TIFM_MMCSD_FIFO_SIZE - 1),
 586                        sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
 587
 588                 host->written_blocks = 0;
 589                 host->flags &= ~CARD_BUSY;
 590                 host->buffer_pos = 0;
 591                 writel(r_data->blocks - 1, sock->addr + SOCK_MMCSD_NUM_BLOCKS);
 592                 writel(r_data->blksz - 1, sock->addr + SOCK_MMCSD_BLOCK_LEN);
 593         }
 594
 595         host->req = mrq;
 596         mod_timer(&host->timer, jiffies + host->timeout_jiffies);
 597         host->state = CMD;
 598         writel(TIFM_CTRL_LED | readl(sock->addr + SOCK_CONTROL),
 599                sock->addr + SOCK_CONTROL);
 600         tifm_sd_exec(host, mrq->cmd);
 601         spin_unlock_irqrestore(&sock->lock, flags);
 602         return;
 603
 604 err_out:
 605         mrq->cmd->error = MMC_ERR_TIMEOUT;
 606         mmc_request_done(mmc, mrq);
 607 }
 608
 609 static void tifm_sd_end_cmd_nodma(unsigned long data)
 610 {
 611         struct tifm_sd *host = (struct tifm_sd*)data;
 612         struct tifm_dev *sock = host->dev;
 613         struct mmc_host *mmc = tifm_get_drvdata(sock);
 614         struct mmc_request *mrq;
 615         struct mmc_data *r_data = NULL;
 616         unsigned long flags;
 617
 618         spin_lock_irqsave(&sock->lock, flags);
 619
 620         del_timer(&host->timer);
 621         mrq = host->req;
 622         host->req = NULL;
 623         host->state = IDLE;
 624
 625         if (!mrq) {
 626                 printk(KERN_ERR DRIVER_NAME ": no request to complete?\n");
 627                 spin_unlock_irqrestore(&sock->lock, flags);
 628                 return;
 629         }
 630
 631         r_data = mrq->cmd->data;
 632         if (r_data) {
 633                 writel((~TIFM_MMCSD_BUFINT) &
 634                         readl(sock->addr + SOCK_MMCSD_INT_ENABLE),
 635                         sock->addr + SOCK_MMCSD_INT_ENABLE);
 636
 637                 if (r_data->flags & MMC_DATA_WRITE) {
 638                         r_data->bytes_xfered = host->written_blocks
 639                                                * r_data->blksz;
 640                 } else {
 641                         r_data->bytes_xfered = r_data->blocks -
 642                                 readl(sock->addr + SOCK_MMCSD_NUM_BLOCKS) - 1;
 643                         r_data->bytes_xfered *= r_data->blksz;
 644                         r_data->bytes_xfered += r_data->blksz -
 645                                 readl(sock->addr + SOCK_MMCSD_BLOCK_LEN) + 1;
 646                 }
 647                 host->buffer_pos = 0;
 648                 host->buffer_size = 0;
 649         }
 650
 651         writel((~TIFM_CTRL_LED) & readl(sock->addr + SOCK_CONTROL),
 652                sock->addr + SOCK_CONTROL);
 653
 654         spin_unlock_irqrestore(&sock->lock, flags);
 655
 656         mmc_request_done(mmc, mrq);
 657 }
 658
 659 static void tifm_sd_terminate(struct tifm_sd *host)
 660 {
 661         struct tifm_dev *sock = host->dev;
 662         unsigned long flags;
 663
 664         writel(0, sock->addr + SOCK_MMCSD_INT_ENABLE);
 665         mmiowb();
 666         spin_lock_irqsave(&sock->lock, flags);
 667         host->flags |= EJECT;
 668         if (host->req) {
 669                 writel(TIFM_FIFO_INT_SETALL,
 670                        sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
 671                 writel(0, sock->addr + SOCK_DMA_FIFO_INT_ENABLE_SET);
 672                 tasklet_schedule(&host->finish_tasklet);
 673         }
 674         spin_unlock_irqrestore(&sock->lock, flags);
 675 }
 676
 677 static void tifm_sd_abort(unsigned long data)
 678 {
 679         struct tifm_sd *host = (struct tifm_sd*)data;
 680
 681         printk(KERN_ERR DRIVER_NAME
 682                ": card failed to respond for a long period of time");
 683
 684         tifm_sd_terminate(host);
 685         tifm_eject(host->dev);
 686 }
 687
 688 static void tifm_sd_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 689 {
 690         struct tifm_sd *host = mmc_priv(mmc);
 691         struct tifm_dev *sock = host->dev;
 692         unsigned int clk_div1, clk_div2;
 693         unsigned long flags;
 694
 695         spin_lock_irqsave(&sock->lock, flags);
 696
 697         dev_dbg(&sock->dev, "Setting bus width %d, power %d\n", ios->bus_width,
 698                 ios->power_mode);
 699         if (ios->bus_width == MMC_BUS_WIDTH_4) {
 700                 writel(TIFM_MMCSD_4BBUS | readl(sock->addr + SOCK_MMCSD_CONFIG),
 701                        sock->addr + SOCK_MMCSD_CONFIG);
 702         } else {
 703                 writel((~TIFM_MMCSD_4BBUS)
 704                        & readl(sock->addr + SOCK_MMCSD_CONFIG),
 705                        sock->addr + SOCK_MMCSD_CONFIG);
 706         }
 707
 708         if (ios->clock) {
 709                 clk_div1 = 20000000 / ios->clock;
 710                 if (!clk_div1)
 711                         clk_div1 = 1;
 712
 713                 clk_div2 = 24000000 / ios->clock;
 714                 if (!clk_div2)
 715                         clk_div2 = 1;
 716
 717                 if ((20000000 / clk_div1) > ios->clock)
 718                         clk_div1++;
 719                 if ((24000000 / clk_div2) > ios->clock)
 720                         clk_div2++;
 721                 if ((20000000 / clk_div1) > (24000000 / clk_div2)) {
 722                         host->clk_freq = 20000000;
 723                         host->clk_div = clk_div1;
 724                         writel((~TIFM_CTRL_FAST_CLK)
 725                                & readl(sock->addr + SOCK_CONTROL),
 726                                sock->addr + SOCK_CONTROL);
 727                 } else {
 728                         host->clk_freq = 24000000;
 729                         host->clk_div = clk_div2;
 730                         writel(TIFM_CTRL_FAST_CLK
 731                                | readl(sock->addr + SOCK_CONTROL),
 732                                sock->addr + SOCK_CONTROL);
 733                 }
 734         } else {
 735                 host->clk_div = 0;
 736         }
 737         host->clk_div &= TIFM_MMCSD_CLKMASK;
 738         writel(host->clk_div
 739                | ((~TIFM_MMCSD_CLKMASK)
 740                   & readl(sock->addr + SOCK_MMCSD_CONFIG)),
 741                sock->addr + SOCK_MMCSD_CONFIG);
 742
 743         if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
 744                 host->flags |= OPENDRAIN;
 745         else
 746                 host->flags &= ~OPENDRAIN;
 747
 748         /* chip_select : maybe later */
 749         //vdd
 750         //power is set before probe / after remove
 751         //I believe, power_off when already marked for eject is sufficient to
 752         // allow removal.
 753         if ((host->flags & EJECT) && ios->power_mode == MMC_POWER_OFF) {
 754                 host->flags |= EJECT_DONE;
 755                 wake_up_all(&host->notify);
 756         }
 757
 758         spin_unlock_irqrestore(&sock->lock, flags);
 759 }
 760
 761 static int tifm_sd_ro(struct mmc_host *mmc)
 762 {
 763         int rc;
 764         struct tifm_sd *host = mmc_priv(mmc);
 765         struct tifm_dev *sock = host->dev;
 766         unsigned long flags;
 767
 768         spin_lock_irqsave(&sock->lock, flags);
 769
 770         host->flags |= (CARD_RO & readl(sock->addr + SOCK_PRESENT_STATE));
 771         rc = (host->flags & CARD_RO) ? 1 : 0;
 772
 773         spin_unlock_irqrestore(&sock->lock, flags);
 774         return rc;
 775 }
 776
 777 static struct mmc_host_ops tifm_sd_ops = {
 778         .request = tifm_sd_request,
 779         .set_ios = tifm_sd_ios,
 780         .get_ro  = tifm_sd_ro
 781 };
 782
 783 static int tifm_sd_initialize_host(struct tifm_sd *host)
 784 {
 785         int rc;
 786         unsigned int host_status = 0;
 787         struct tifm_dev *sock = host->dev;
 788
 789         writel(0, sock->addr + SOCK_MMCSD_INT_ENABLE);
 790         mmiowb();
 791         host->clk_div = 61;
 792         host->clk_freq = 20000000;
 793         writel(TIFM_MMCSD_RESET, sock->addr + SOCK_MMCSD_SYSTEM_CONTROL);
 794         writel(host->clk_div | TIFM_MMCSD_POWER,
 795                sock->addr + SOCK_MMCSD_CONFIG);
 796
 797         /* wait up to 0.51 sec for reset */
 798         for (rc = 2; rc <= 256; rc <<= 1) {
 799                 if (1 & readl(sock->addr + SOCK_MMCSD_SYSTEM_STATUS)) {
 800                         rc = 0;
 801                         break;
 802                 }
 803                 msleep(rc);
 804         }
 805
 806         if (rc) {
 807                 printk(KERN_ERR DRIVER_NAME
 808                        ": controller failed to reset\n");
 809                 return -ENODEV;
 810         }
 811
 812         writel(0, sock->addr + SOCK_MMCSD_NUM_BLOCKS);
 813         writel(host->clk_div | TIFM_MMCSD_POWER,
 814                sock->addr + SOCK_MMCSD_CONFIG);
 815         writel(TIFM_MMCSD_RXDE, sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
 816
 817         // command timeout fixed to 64 clocks for now
 818         writel(64, sock->addr + SOCK_MMCSD_COMMAND_TO);
 819         writel(TIFM_MMCSD_INAB, sock->addr + SOCK_MMCSD_COMMAND);
 820
 821         /* INAB should take much less than reset */
 822         for (rc = 1; rc <= 16; rc <<= 1) {
 823                 host_status = readl(sock->addr + SOCK_MMCSD_STATUS);
 824                 writel(host_status, sock->addr + SOCK_MMCSD_STATUS);
 825                 if (!(host_status & TIFM_MMCSD_ERRMASK)
 826                     && (host_status & TIFM_MMCSD_EOC)) {
 827                         rc = 0;
 828                         break;
 829                 }
 830                 msleep(rc);
 831         }
 832
 833         if (rc) {
 834                 printk(KERN_ERR DRIVER_NAME
 835                        ": card not ready - probe failed on initialization\n");
 836                 return -ENODEV;
 837         }
 838
 839         writel(TIFM_MMCSD_DATAMASK | TIFM_MMCSD_ERRMASK,
 840                sock->addr + SOCK_MMCSD_INT_ENABLE);
 841         mmiowb();
 842
 843         return 0;
 844 }
 845
 846 static int tifm_sd_probe(struct tifm_dev *sock)
 847 {
 848         struct mmc_host *mmc;
 849         struct tifm_sd *host;
 850         int rc = -EIO;
 851
 852         if (!(TIFM_SOCK_STATE_OCCUPIED
 853               & readl(sock->addr + SOCK_PRESENT_STATE))) {
 854                 printk(KERN_WARNING DRIVER_NAME ": card gone, unexpectedly\n");
 855                 return rc;
 856         }
 857
 858         mmc = mmc_alloc_host(sizeof(struct tifm_sd), &sock->dev);
 859         if (!mmc)
 860                 return -ENOMEM;
 861
 862         host = mmc_priv(mmc);
 863         tifm_set_drvdata(sock, mmc);
 864         host->dev = sock;
 865         host->timeout_jiffies = msecs_to_jiffies(1000);
 866
 867         init_waitqueue_head(&host->notify);
 868         tasklet_init(&host->finish_tasklet,
 869                      no_dma ? tifm_sd_end_cmd_nodma : tifm_sd_end_cmd,
 870                      (unsigned long)host);
 871         setup_timer(&host->timer, tifm_sd_abort, (unsigned long)host);
 872
 873         tifm_sd_ops.request = no_dma ? tifm_sd_request_nodma : tifm_sd_request;
 874         mmc->ops = &tifm_sd_ops;
 875         mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
 876         mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_MULTIWRITE;
 877         mmc->f_min = 20000000 / 60;
 878         mmc->f_max = 24000000;
 879         mmc->max_hw_segs = 1;
 880         mmc->max_phys_segs = 1;
 881         // limited by DMA counter - it's safer to stick with
 882         // block counter has 11 bits though
 883         mmc->max_blk_count = 256;
 884         // 2k maximum hw block length
 885         mmc->max_blk_size = 2048;
 886         mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
 887         mmc->max_seg_size = mmc->max_req_size;
 888         sock->signal_irq = tifm_sd_signal_irq;
 889         rc = tifm_sd_initialize_host(host);
 890
 891         if (!rc)
 892                 rc = mmc_add_host(mmc);
 893         if (rc)
 894                 goto out_free_mmc;
 895
 896         return 0;
 897 out_free_mmc:
 898         mmc_free_host(mmc);
 899         return rc;
 900 }
 901
 902 static void tifm_sd_remove(struct tifm_dev *sock)
 903 {
 904         struct mmc_host *mmc = tifm_get_drvdata(sock);
 905         struct tifm_sd *host = mmc_priv(mmc);
 906
 907         del_timer_sync(&host->timer);
 908         tifm_sd_terminate(host);
 909         wait_event_timeout(host->notify, host->flags & EJECT_DONE,
 910                            host->timeout_jiffies);
 911         tasklet_kill(&host->finish_tasklet);
 912         mmc_remove_host(mmc);
 913
 914         /* The meaning of the bit majority in this constant is unknown. */
 915         writel(0xfff8 & readl(sock->addr + SOCK_CONTROL),
 916                sock->addr + SOCK_CONTROL);
 917
 918         tifm_set_drvdata(sock, NULL);
 919         mmc_free_host(mmc);
 920 }
 921
 922 #ifdef CONFIG_PM
 923
 924 static int tifm_sd_suspend(struct tifm_dev *sock, pm_message_t state)
 925 {
 926         struct mmc_host *mmc = tifm_get_drvdata(sock);
 927         int rc;
 928
 929         rc = mmc_suspend_host(mmc, state);
 930         /* The meaning of the bit majority in this constant is unknown. */
 931         writel(0xfff8 & readl(sock->addr + SOCK_CONTROL),
 932                sock->addr + SOCK_CONTROL);
 933         return rc;
 934 }
 935
 936 static int tifm_sd_resume(struct tifm_dev *sock)
 937 {
 938         struct mmc_host *mmc = tifm_get_drvdata(sock);
 939         struct tifm_sd *host = mmc_priv(mmc);
 940
 941         if (sock->media_id != FM_SD
 942             || tifm_sd_initialize_host(host)) {
 943                 tifm_eject(sock);
 944                 return 0;
 945         } else {
 946                 return mmc_resume_host(mmc);
 947         }
 948 }
 949
 950 #else
 951
 952 #define tifm_sd_suspend NULL
 953 #define tifm_sd_resume NULL
 954
 955 #endif /* CONFIG_PM */
 956
 957 static tifm_media_id tifm_sd_id_tbl[] = {
 958         FM_SD, 0
 959 };
 960
 961 static struct tifm_driver tifm_sd_driver = {
 962         .driver = {
 963                 .name  = DRIVER_NAME,
 964                 .owner = THIS_MODULE
 965         },
 966         .id_table = tifm_sd_id_tbl,
 967         .probe    = tifm_sd_probe,
 968         .remove   = tifm_sd_remove,
 969         .suspend  = tifm_sd_suspend,
 970         .resume   = tifm_sd_resume
 971 };
 972
 973 static int __init tifm_sd_init(void)
 974 {
 975         return tifm_register_driver(&tifm_sd_driver);
 976 }
 977
 978 static void __exit tifm_sd_exit(void)
 979 {
 980         tifm_unregister_driver(&tifm_sd_driver);
 981 }
 982
 983 MODULE_AUTHOR("Alex Dubov");
 984 MODULE_DESCRIPTION("TI FlashMedia SD driver");
 985 MODULE_LICENSE("GPL");
 986 MODULE_DEVICE_TABLE(tifm, tifm_sd_id_tbl);
 987 MODULE_VERSION(DRIVER_VERSION);
 988
 989 module_init(tifm_sd_init);
 990 module_exit(tifm_sd_exit);