drivers/mmc/tifm_sd.c

   1 /*
   2  *  tifm_sd.c - TI FlashMedia driver
   3  *
   4  *  Copyright (C) 2006 Alex Dubov <oakad@yahoo.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  */
  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 "0.6"
  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         HOST_REG   = 0x0002,
  83         EJECT      = 0x0004,
  84         EJECT_DONE = 0x0008,
  85         CARD_BUSY  = 0x0010,
  86         OPENDRAIN  = 0x0040,     /* hardware dependent value */
  87         CARD_EVENT = 0x0100,     /* hardware dependent value */
  88         CARD_RO    = 0x0200,     /* hardware dependent value */
  89         FIFO_EVENT = 0x10000 };  /* hardware dependent value */
  90
  91 struct tifm_sd {
  92         struct tifm_dev     *dev;
  93
  94         unsigned int        flags;
  95         card_state_t        state;
  96         unsigned int        clk_freq;
  97         unsigned int        clk_div;
  98         unsigned long       timeout_jiffies; // software timeout - 2 sec
  99
 100         struct mmc_request    *req;
 101         struct work_struct    cmd_handler;
 102         struct delayed_work   abort_handler;
 103         wait_queue_head_t     can_eject;
 104
 105         size_t                written_blocks;
 106         char                  *buffer;
 107         size_t                buffer_size;
 108         size_t                buffer_pos;
 109
 110 };
 111
 112 static int tifm_sd_transfer_data(struct tifm_dev *sock, struct tifm_sd *host,
 113                                         unsigned int host_status)
 114 {
 115         struct mmc_command *cmd = host->req->cmd;
 116         unsigned int t_val = 0, cnt = 0;
 117
 118         if (host_status & TIFM_MMCSD_BRS) {
 119                 /* in non-dma rx mode BRS fires when fifo is still not empty */
 120                 if (host->buffer && (cmd->data->flags & MMC_DATA_READ)) {
 121                         while (host->buffer_size > host->buffer_pos) {
 122                                 t_val = readl(sock->addr + SOCK_MMCSD_DATA);
 123                                 host->buffer[host->buffer_pos++] = t_val & 0xff;
 124                                 host->buffer[host->buffer_pos++] =
 125                                                         (t_val >> 8) & 0xff;
 126                         }
 127                 }
 128                 return 1;
 129         } else if (host->buffer) {
 130                 if ((cmd->data->flags & MMC_DATA_READ) &&
 131                                 (host_status & TIFM_MMCSD_AF)) {
 132                         for (cnt = 0; cnt < TIFM_MMCSD_FIFO_SIZE; cnt++) {
 133                                 t_val = readl(sock->addr + SOCK_MMCSD_DATA);
 134                                 if (host->buffer_size > host->buffer_pos) {
 135                                         host->buffer[host->buffer_pos++] =
 136                                                         t_val & 0xff;
 137                                         host->buffer[host->buffer_pos++] =
 138                                                         (t_val >> 8) & 0xff;
 139                                 }
 140                         }
 141                 } else if ((cmd->data->flags & MMC_DATA_WRITE)
 142                            && (host_status & TIFM_MMCSD_AE)) {
 143                         for (cnt = 0; cnt < TIFM_MMCSD_FIFO_SIZE; cnt++) {
 144                                 if (host->buffer_size > host->buffer_pos) {
 145                                         t_val = host->buffer[host->buffer_pos++] & 0x00ff;
 146                                         t_val |= ((host->buffer[host->buffer_pos++]) << 8)
 147                                                  & 0xff00;
 148                                         writel(t_val,
 149                                                 sock->addr + SOCK_MMCSD_DATA);
 150                                 }
 151                         }
 152                 }
 153         }
 154         return 0;
 155 }
 156
 157 static unsigned int tifm_sd_op_flags(struct mmc_command *cmd)
 158 {
 159         unsigned int rc = 0;
 160
 161         switch (mmc_resp_type(cmd)) {
 162         case MMC_RSP_NONE:
 163                 rc |= TIFM_MMCSD_RSP_R0;
 164                 break;
 165         case MMC_RSP_R1B:
 166                 rc |= TIFM_MMCSD_RSP_BUSY; // deliberate fall-through
 167         case MMC_RSP_R1:
 168                 rc |= TIFM_MMCSD_RSP_R1;
 169                 break;
 170         case MMC_RSP_R2:
 171                 rc |= TIFM_MMCSD_RSP_R2;
 172                 break;
 173         case MMC_RSP_R3:
 174                 rc |= TIFM_MMCSD_RSP_R3;
 175                 break;
 176         case MMC_RSP_R6:
 177                 rc |= TIFM_MMCSD_RSP_R6;
 178                 break;
 179         default:
 180                 BUG();
 181         }
 182
 183         switch (mmc_cmd_type(cmd)) {
 184         case MMC_CMD_BC:
 185                 rc |= TIFM_MMCSD_CMD_BC;
 186                 break;
 187         case MMC_CMD_BCR:
 188                 rc |= TIFM_MMCSD_CMD_BCR;
 189                 break;
 190         case MMC_CMD_AC:
 191                 rc |= TIFM_MMCSD_CMD_AC;
 192                 break;
 193         case MMC_CMD_ADTC:
 194                 rc |= TIFM_MMCSD_CMD_ADTC;
 195                 break;
 196         default:
 197                 BUG();
 198         }
 199         return rc;
 200 }
 201
 202 static void tifm_sd_exec(struct tifm_sd *host, struct mmc_command *cmd)
 203 {
 204         struct tifm_dev *sock = host->dev;
 205         unsigned int cmd_mask = tifm_sd_op_flags(cmd) |
 206                                 (host->flags & OPENDRAIN);
 207
 208         if (cmd->data && (cmd->data->flags & MMC_DATA_READ))
 209                 cmd_mask |= TIFM_MMCSD_READ;
 210
 211         dev_dbg(&sock->dev, "executing opcode 0x%x, arg: 0x%x, mask: 0x%x\n",
 212                                 cmd->opcode, cmd->arg, cmd_mask);
 213
 214         writel((cmd->arg >> 16) & 0xffff, sock->addr + SOCK_MMCSD_ARG_HIGH);
 215         writel(cmd->arg & 0xffff, sock->addr + SOCK_MMCSD_ARG_LOW);
 216         writel(cmd->opcode | cmd_mask, sock->addr + SOCK_MMCSD_COMMAND);
 217 }
 218
 219 static void tifm_sd_fetch_resp(struct mmc_command *cmd, struct tifm_dev *sock)
 220 {
 221         cmd->resp[0] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x1c) << 16)
 222                        | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x18);
 223         cmd->resp[1] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x14) << 16)
 224                        | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x10);
 225         cmd->resp[2] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x0c) << 16)
 226                        | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x08);
 227         cmd->resp[3] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x04) << 16)
 228                        | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x00);
 229 }
 230
 231 static void tifm_sd_process_cmd(struct tifm_dev *sock, struct tifm_sd *host,
 232                                        unsigned int host_status)
 233 {
 234         struct mmc_command *cmd = host->req->cmd;
 235
 236 change_state:
 237         switch (host->state) {
 238         case IDLE:
 239                 return;
 240         case CMD:
 241                 if (host_status & TIFM_MMCSD_EOC) {
 242                         tifm_sd_fetch_resp(cmd, sock);
 243                         if (cmd->data) {
 244                                 host->state = BRS;
 245                         } else
 246                                 host->state = READY;
 247                         goto change_state;
 248                 }
 249                 break;
 250         case BRS:
 251                 if (tifm_sd_transfer_data(sock, host, host_status)) {
 252                         if (!host->req->stop) {
 253                                 if (cmd->data->flags & MMC_DATA_WRITE) {
 254                                         host->state = CARD;
 255                                 } else {
 256                                         host->state =
 257                                                 host->buffer ? READY : FIFO;
 258                                 }
 259                                 goto change_state;
 260                         }
 261                         tifm_sd_exec(host, host->req->stop);
 262                         host->state = SCMD;
 263                 }
 264                 break;
 265         case SCMD:
 266                 if (host_status & TIFM_MMCSD_EOC) {
 267                         tifm_sd_fetch_resp(host->req->stop, sock);
 268                         if (cmd->error) {
 269                                 host->state = READY;
 270                         } else if (cmd->data->flags & MMC_DATA_WRITE) {
 271                                 host->state = CARD;
 272                         } else {
 273                                 host->state = host->buffer ? READY : FIFO;
 274                         }
 275                         goto change_state;
 276                 }
 277                 break;
 278         case CARD:
 279                 if (!(host->flags & CARD_BUSY)
 280                     && (host->written_blocks == cmd->data->blocks)) {
 281                         host->state = host->buffer ? READY : FIFO;
 282                         goto change_state;
 283                 }
 284                 break;
 285         case FIFO:
 286                 if (host->flags & FIFO_RDY) {
 287                         host->state = READY;
 288                         host->flags &= ~FIFO_RDY;
 289                         goto change_state;
 290                 }
 291                 break;
 292         case READY:
 293                 queue_work(sock->wq, &host->cmd_handler);
 294                 return;
 295         }
 296
 297         queue_delayed_work(sock->wq, &host->abort_handler,
 298                                 host->timeout_jiffies);
 299 }
 300
 301 /* Called from interrupt handler */
 302 static unsigned int tifm_sd_signal_irq(struct tifm_dev *sock,
 303                                         unsigned int sock_irq_status)
 304 {
 305         struct tifm_sd *host;
 306         unsigned int host_status = 0, fifo_status = 0;
 307         int error_code = 0;
 308
 309         spin_lock(&sock->lock);
 310         host = mmc_priv((struct mmc_host*)tifm_get_drvdata(sock));
 311         cancel_delayed_work(&host->abort_handler);
 312
 313         if (sock_irq_status & FIFO_EVENT) {
 314                 fifo_status = readl(sock->addr + SOCK_DMA_FIFO_STATUS);
 315                 writel(fifo_status, sock->addr + SOCK_DMA_FIFO_STATUS);
 316
 317                 host->flags |= fifo_status & FIFO_RDY;
 318         }
 319
 320         if (sock_irq_status & CARD_EVENT) {
 321                 host_status = readl(sock->addr + SOCK_MMCSD_STATUS);
 322                 writel(host_status, sock->addr + SOCK_MMCSD_STATUS);
 323
 324                 if (!(host->flags & HOST_REG))
 325                         queue_work(sock->wq, &host->cmd_handler);
 326                 if (!host->req)
 327                         goto done;
 328
 329                 if (host_status & TIFM_MMCSD_ERRMASK) {
 330                         if (host_status & TIFM_MMCSD_CERR)
 331                                 error_code = MMC_ERR_FAILED;
 332                         else if (host_status &
 333                                         (TIFM_MMCSD_CTO | TIFM_MMCSD_DTO))
 334                                 error_code = MMC_ERR_TIMEOUT;
 335                         else if (host_status &
 336                                         (TIFM_MMCSD_CCRC | TIFM_MMCSD_DCRC))
 337                                 error_code = MMC_ERR_BADCRC;
 338
 339                         writel(TIFM_FIFO_INT_SETALL,
 340                                sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
 341                         writel(TIFM_DMA_RESET, sock->addr + SOCK_DMA_CONTROL);
 342
 343                         if (host->req->stop) {
 344                                 if (host->state == SCMD) {
 345                                         host->req->stop->error = error_code;
 346                                 } else if(host->state == BRS) {
 347                                         host->req->cmd->error = error_code;
 348                                         tifm_sd_exec(host, host->req->stop);
 349                                         queue_delayed_work(sock->wq,
 350                                                 &host->abort_handler,
 351                                                 host->timeout_jiffies);
 352                                         host->state = SCMD;
 353                                         goto done;
 354                                 } else {
 355                                         host->req->cmd->error = error_code;
 356                                 }
 357                         } else {
 358                                 host->req->cmd->error = error_code;
 359                         }
 360                         host->state = READY;
 361                 }
 362
 363                 if (host_status & TIFM_MMCSD_CB)
 364                         host->flags |= CARD_BUSY;
 365                 if ((host_status & TIFM_MMCSD_EOFB) &&
 366                                 (host->flags & CARD_BUSY)) {
 367                         host->written_blocks++;
 368                         host->flags &= ~CARD_BUSY;
 369                 }
 370         }
 371
 372         if (host->req)
 373                 tifm_sd_process_cmd(sock, host, host_status);
 374 done:
 375         dev_dbg(&sock->dev, "host_status %x, fifo_status %x\n",
 376                         host_status, fifo_status);
 377         spin_unlock(&sock->lock);
 378         return sock_irq_status;
 379 }
 380
 381 static void tifm_sd_prepare_data(struct tifm_sd *card, struct mmc_command *cmd)
 382 {
 383         struct tifm_dev *sock = card->dev;
 384         unsigned int dest_cnt;
 385
 386         /* DMA style IO */
 387
 388         writel(TIFM_FIFO_INT_SETALL,
 389                 sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
 390         writel(ilog2(cmd->data->blksz) - 2,
 391                         sock->addr + SOCK_FIFO_PAGE_SIZE);
 392         writel(TIFM_FIFO_ENABLE, sock->addr + SOCK_FIFO_CONTROL);
 393         writel(TIFM_FIFO_INTMASK, sock->addr + SOCK_DMA_FIFO_INT_ENABLE_SET);
 394
 395         dest_cnt = (cmd->data->blocks) << 8;
 396
 397         writel(sg_dma_address(cmd->data->sg), sock->addr + SOCK_DMA_ADDRESS);
 398
 399         writel(cmd->data->blocks - 1, sock->addr + SOCK_MMCSD_NUM_BLOCKS);
 400         writel(cmd->data->blksz - 1, sock->addr + SOCK_MMCSD_BLOCK_LEN);
 401
 402         if (cmd->data->flags & MMC_DATA_WRITE) {
 403                 writel(TIFM_MMCSD_TXDE, sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
 404                 writel(dest_cnt | TIFM_DMA_TX | TIFM_DMA_EN,
 405                         sock->addr + SOCK_DMA_CONTROL);
 406         } else {
 407                 writel(TIFM_MMCSD_RXDE, sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
 408                 writel(dest_cnt | TIFM_DMA_EN, sock->addr + SOCK_DMA_CONTROL);
 409         }
 410 }
 411
 412 static void tifm_sd_set_data_timeout(struct tifm_sd *host,
 413                                         struct mmc_data *data)
 414 {
 415         struct tifm_dev *sock = host->dev;
 416         unsigned int data_timeout = data->timeout_clks;
 417
 418         if (fixed_timeout)
 419                 return;
 420
 421         data_timeout += data->timeout_ns /
 422                         ((1000000000 / host->clk_freq) * host->clk_div);
 423         data_timeout *= 10; // call it fudge factor for now
 424
 425         if (data_timeout < 0xffff) {
 426                 writel((~TIFM_MMCSD_DPE) &
 427                                 readl(sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG),
 428                        sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG);
 429                 writel(data_timeout, sock->addr + SOCK_MMCSD_DATA_TO);
 430         } else {
 431                 writel(TIFM_MMCSD_DPE |
 432                                 readl(sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG),
 433                         sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG);
 434                 data_timeout = (data_timeout >> 10) + 1;
 435                 if(data_timeout > 0xffff)
 436                         data_timeout = 0;       /* set to unlimited */
 437                 writel(data_timeout, sock->addr + SOCK_MMCSD_DATA_TO);
 438         }
 439 }
 440
 441 static void tifm_sd_request(struct mmc_host *mmc, struct mmc_request *mrq)
 442 {
 443         struct tifm_sd *host = mmc_priv(mmc);
 444         struct tifm_dev *sock = host->dev;
 445         unsigned long flags;
 446         int sg_count = 0;
 447         struct mmc_data *r_data = mrq->cmd->data;
 448
 449         spin_lock_irqsave(&sock->lock, flags);
 450         if (host->flags & EJECT) {
 451                 spin_unlock_irqrestore(&sock->lock, flags);
 452                 goto err_out;
 453         }
 454
 455         if (host->req) {
 456                 printk(KERN_ERR DRIVER_NAME ": unfinished request detected\n");
 457                 spin_unlock_irqrestore(&sock->lock, flags);
 458                 goto err_out;
 459         }
 460
 461         if (r_data) {
 462                 tifm_sd_set_data_timeout(host, r_data);
 463
 464                 sg_count = tifm_map_sg(sock, r_data->sg, r_data->sg_len,
 465                                        mrq->cmd->flags & MMC_DATA_WRITE
 466                                        ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
 467                 if (sg_count != 1) {
 468                         printk(KERN_ERR DRIVER_NAME
 469                                 ": scatterlist map failed\n");
 470                         spin_unlock_irqrestore(&sock->lock, flags);
 471                         goto err_out;
 472                 }
 473
 474                 host->written_blocks = 0;
 475                 host->flags &= ~CARD_BUSY;
 476                 tifm_sd_prepare_data(host, mrq->cmd);
 477         }
 478
 479         host->req = mrq;
 480         host->state = CMD;
 481         queue_delayed_work(sock->wq, &host->abort_handler,
 482                                 host->timeout_jiffies);
 483         writel(TIFM_CTRL_LED | readl(sock->addr + SOCK_CONTROL),
 484                 sock->addr + SOCK_CONTROL);
 485         tifm_sd_exec(host, mrq->cmd);
 486         spin_unlock_irqrestore(&sock->lock, flags);
 487         return;
 488
 489 err_out:
 490         if (sg_count > 0)
 491                 tifm_unmap_sg(sock, r_data->sg, r_data->sg_len,
 492                               (r_data->flags & MMC_DATA_WRITE)
 493                               ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
 494
 495         mrq->cmd->error = MMC_ERR_TIMEOUT;
 496         mmc_request_done(mmc, mrq);
 497 }
 498
 499 static void tifm_sd_end_cmd(struct work_struct *work)
 500 {
 501         struct tifm_sd *host = container_of(work, struct tifm_sd, cmd_handler);
 502         struct tifm_dev *sock = host->dev;
 503         struct mmc_host *mmc = tifm_get_drvdata(sock);
 504         struct mmc_request *mrq;
 505         struct mmc_data *r_data = NULL;
 506         unsigned long flags;
 507
 508         spin_lock_irqsave(&sock->lock, flags);
 509
 510         mrq = host->req;
 511         host->req = NULL;
 512         host->state = IDLE;
 513
 514         if (!mrq) {
 515                 printk(KERN_ERR DRIVER_NAME ": no request to complete?\n");
 516                 spin_unlock_irqrestore(&sock->lock, flags);
 517                 return;
 518         }
 519
 520         r_data = mrq->cmd->data;
 521         if (r_data) {
 522                 if (r_data->flags & MMC_DATA_WRITE) {
 523                         r_data->bytes_xfered = host->written_blocks *
 524                                                 r_data->blksz;
 525                 } else {
 526                         r_data->bytes_xfered = r_data->blocks -
 527                                 readl(sock->addr + SOCK_MMCSD_NUM_BLOCKS) - 1;
 528                         r_data->bytes_xfered *= r_data->blksz;
 529                         r_data->bytes_xfered += r_data->blksz -
 530                                 readl(sock->addr + SOCK_MMCSD_BLOCK_LEN) + 1;
 531                 }
 532                 tifm_unmap_sg(sock, r_data->sg, r_data->sg_len,
 533                               (r_data->flags & MMC_DATA_WRITE)
 534                               ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
 535         }
 536
 537         writel((~TIFM_CTRL_LED) & readl(sock->addr + SOCK_CONTROL),
 538                         sock->addr + SOCK_CONTROL);
 539
 540         spin_unlock_irqrestore(&sock->lock, flags);
 541         mmc_request_done(mmc, mrq);
 542 }
 543
 544 static void tifm_sd_request_nodma(struct mmc_host *mmc, struct mmc_request *mrq)
 545 {
 546         struct tifm_sd *host = mmc_priv(mmc);
 547         struct tifm_dev *sock = host->dev;
 548         unsigned long flags;
 549         struct mmc_data *r_data = mrq->cmd->data;
 550         char *t_buffer = NULL;
 551
 552         if (r_data) {
 553                 t_buffer = kmap(r_data->sg->page);
 554                 if (!t_buffer) {
 555                         printk(KERN_ERR DRIVER_NAME ": kmap failed\n");
 556                         goto err_out;
 557                 }
 558         }
 559
 560         spin_lock_irqsave(&sock->lock, flags);
 561         if (host->flags & EJECT) {
 562                 spin_unlock_irqrestore(&sock->lock, flags);
 563                 goto err_out;
 564         }
 565
 566         if (host->req) {
 567                 printk(KERN_ERR DRIVER_NAME ": unfinished request detected\n");
 568                 spin_unlock_irqrestore(&sock->lock, flags);
 569                 goto err_out;
 570         }
 571
 572         if (r_data) {
 573                 tifm_sd_set_data_timeout(host, r_data);
 574
 575                 host->buffer = t_buffer + r_data->sg->offset;
 576                 host->buffer_size = mrq->cmd->data->blocks *
 577                                         mrq->cmd->data->blksz;
 578
 579                 writel(TIFM_MMCSD_BUFINT |
 580                                 readl(sock->addr + SOCK_MMCSD_INT_ENABLE),
 581                        sock->addr + SOCK_MMCSD_INT_ENABLE);
 582                 writel(((TIFM_MMCSD_FIFO_SIZE - 1) << 8) |
 583                                 (TIFM_MMCSD_FIFO_SIZE - 1),
 584                        sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
 585
 586                 host->written_blocks = 0;
 587                 host->flags &= ~CARD_BUSY;
 588                 host->buffer_pos = 0;
 589                 writel(r_data->blocks - 1, sock->addr + SOCK_MMCSD_NUM_BLOCKS);
 590                 writel(r_data->blksz - 1, sock->addr + SOCK_MMCSD_BLOCK_LEN);
 591         }
 592
 593         host->req = mrq;
 594         host->state = CMD;
 595         queue_delayed_work(sock->wq, &host->abort_handler,
 596                                 host->timeout_jiffies);
 597         writel(TIFM_CTRL_LED | readl(sock->addr + SOCK_CONTROL),
 598                 sock->addr + SOCK_CONTROL);
 599         tifm_sd_exec(host, mrq->cmd);
 600         spin_unlock_irqrestore(&sock->lock, flags);
 601         return;
 602
 603 err_out:
 604         if (t_buffer)
 605                 kunmap(r_data->sg->page);
 606
 607         mrq->cmd->error = MMC_ERR_TIMEOUT;
 608         mmc_request_done(mmc, mrq);
 609 }
 610
 611 static void tifm_sd_end_cmd_nodma(struct work_struct *work)
 612 {
 613         struct tifm_sd *host = container_of(work, struct tifm_sd, cmd_handler);
 614         struct tifm_dev *sock = host->dev;
 615         struct mmc_host *mmc = tifm_get_drvdata(sock);
 616         struct mmc_request *mrq;
 617         struct mmc_data *r_data = NULL;
 618         unsigned long flags;
 619
 620         spin_lock_irqsave(&sock->lock, flags);
 621
 622         mrq = host->req;
 623         host->req = NULL;
 624         host->state = IDLE;
 625
 626         if (!mrq) {
 627                 printk(KERN_ERR DRIVER_NAME ": no request to complete?\n");
 628                 spin_unlock_irqrestore(&sock->lock, flags);
 629                 return;
 630         }
 631
 632         r_data = mrq->cmd->data;
 633         if (r_data) {
 634                 writel((~TIFM_MMCSD_BUFINT) &
 635                         readl(sock->addr + SOCK_MMCSD_INT_ENABLE),
 636                         sock->addr + SOCK_MMCSD_INT_ENABLE);
 637
 638                 if (r_data->flags & MMC_DATA_WRITE) {
 639                         r_data->bytes_xfered = host->written_blocks *
 640                                                 r_data->blksz;
 641                 } else {
 642                         r_data->bytes_xfered = r_data->blocks -
 643                                 readl(sock->addr + SOCK_MMCSD_NUM_BLOCKS) - 1;
 644                         r_data->bytes_xfered *= r_data->blksz;
 645                         r_data->bytes_xfered += r_data->blksz -
 646                                 readl(sock->addr + SOCK_MMCSD_BLOCK_LEN) + 1;
 647                 }
 648                 host->buffer = NULL;
 649                 host->buffer_pos = 0;
 650                 host->buffer_size = 0;
 651         }
 652
 653         writel((~TIFM_CTRL_LED) & readl(sock->addr + SOCK_CONTROL),
 654                         sock->addr + SOCK_CONTROL);
 655
 656         spin_unlock_irqrestore(&sock->lock, flags);
 657
 658         if (r_data)
 659                 kunmap(r_data->sg->page);
 660
 661         mmc_request_done(mmc, mrq);
 662 }
 663
 664 static void tifm_sd_abort(struct work_struct *work)
 665 {
 666         struct tifm_sd *host =
 667                 container_of(work, struct tifm_sd, abort_handler.work);
 668
 669         printk(KERN_ERR DRIVER_NAME
 670                 ": card failed to respond for a long period of time");
 671         tifm_eject(host->dev);
 672 }
 673
 674 static void tifm_sd_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 675 {
 676         struct tifm_sd *host = mmc_priv(mmc);
 677         struct tifm_dev *sock = host->dev;
 678         unsigned int clk_div1, clk_div2;
 679         unsigned long flags;
 680
 681         spin_lock_irqsave(&sock->lock, flags);
 682
 683         dev_dbg(&sock->dev, "Setting bus width %d, power %d\n", ios->bus_width,
 684                 ios->power_mode);
 685         if (ios->bus_width == MMC_BUS_WIDTH_4) {
 686                 writel(TIFM_MMCSD_4BBUS | readl(sock->addr + SOCK_MMCSD_CONFIG),
 687                        sock->addr + SOCK_MMCSD_CONFIG);
 688         } else {
 689                 writel((~TIFM_MMCSD_4BBUS) &
 690                                 readl(sock->addr + SOCK_MMCSD_CONFIG),
 691                         sock->addr + SOCK_MMCSD_CONFIG);
 692         }
 693
 694         if (ios->clock) {
 695                 clk_div1 = 20000000 / ios->clock;
 696                 if (!clk_div1)
 697                         clk_div1 = 1;
 698
 699                 clk_div2 = 24000000 / ios->clock;
 700                 if (!clk_div2)
 701                         clk_div2 = 1;
 702
 703                 if ((20000000 / clk_div1) > ios->clock)
 704                         clk_div1++;
 705                 if ((24000000 / clk_div2) > ios->clock)
 706                         clk_div2++;
 707                 if ((20000000 / clk_div1) > (24000000 / clk_div2)) {
 708                         host->clk_freq = 20000000;
 709                         host->clk_div = clk_div1;
 710                         writel((~TIFM_CTRL_FAST_CLK) &
 711                                         readl(sock->addr + SOCK_CONTROL),
 712                                 sock->addr + SOCK_CONTROL);
 713                 } else {
 714                         host->clk_freq = 24000000;
 715                         host->clk_div = clk_div2;
 716                         writel(TIFM_CTRL_FAST_CLK |
 717                                         readl(sock->addr + SOCK_CONTROL),
 718                                 sock->addr + SOCK_CONTROL);
 719                 }
 720         } else {
 721                 host->clk_div = 0;
 722         }
 723         host->clk_div &= TIFM_MMCSD_CLKMASK;
 724         writel(host->clk_div | ((~TIFM_MMCSD_CLKMASK) &
 725                         readl(sock->addr + SOCK_MMCSD_CONFIG)),
 726                 sock->addr + SOCK_MMCSD_CONFIG);
 727
 728         if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
 729                 host->flags |= OPENDRAIN;
 730         else
 731                 host->flags &= ~OPENDRAIN;
 732
 733         /* chip_select : maybe later */
 734         //vdd
 735         //power is set before probe / after remove
 736         //I believe, power_off when already marked for eject is sufficient to
 737         // allow removal.
 738         if ((host->flags & EJECT) && ios->power_mode == MMC_POWER_OFF) {
 739                 host->flags |= EJECT_DONE;
 740                 wake_up_all(&host->can_eject);
 741         }
 742
 743         spin_unlock_irqrestore(&sock->lock, flags);
 744 }
 745
 746 static int tifm_sd_ro(struct mmc_host *mmc)
 747 {
 748         int rc;
 749         struct tifm_sd *host = mmc_priv(mmc);
 750         struct tifm_dev *sock = host->dev;
 751         unsigned long flags;
 752
 753         spin_lock_irqsave(&sock->lock, flags);
 754
 755         host->flags |= (CARD_RO & readl(sock->addr + SOCK_PRESENT_STATE));
 756         rc = (host->flags & CARD_RO) ? 1 : 0;
 757
 758         spin_unlock_irqrestore(&sock->lock, flags);
 759         return rc;
 760 }
 761
 762 static struct mmc_host_ops tifm_sd_ops = {
 763         .request = tifm_sd_request,
 764         .set_ios = tifm_sd_ios,
 765         .get_ro  = tifm_sd_ro
 766 };
 767
 768 static void tifm_sd_register_host(struct work_struct *work)
 769 {
 770         struct tifm_sd *host = container_of(work, struct tifm_sd, cmd_handler);
 771         struct tifm_dev *sock = host->dev;
 772         struct mmc_host *mmc = tifm_get_drvdata(sock);
 773         unsigned long flags;
 774
 775         spin_lock_irqsave(&sock->lock, flags);
 776         host->flags |= HOST_REG;
 777         PREPARE_WORK(&host->cmd_handler,
 778                         no_dma ? tifm_sd_end_cmd_nodma : tifm_sd_end_cmd);
 779         spin_unlock_irqrestore(&sock->lock, flags);
 780         dev_dbg(&sock->dev, "adding host\n");
 781         mmc_add_host(mmc);
 782 }
 783
 784 static int tifm_sd_probe(struct tifm_dev *sock)
 785 {
 786         struct mmc_host *mmc;
 787         struct tifm_sd *host;
 788         int rc = -EIO;
 789
 790         if (!(TIFM_SOCK_STATE_OCCUPIED &
 791                         readl(sock->addr + SOCK_PRESENT_STATE))) {
 792                 printk(KERN_WARNING DRIVER_NAME ": card gone, unexpectedly\n");
 793                 return rc;
 794         }
 795
 796         mmc = mmc_alloc_host(sizeof(struct tifm_sd), &sock->dev);
 797         if (!mmc)
 798                 return -ENOMEM;
 799
 800         host = mmc_priv(mmc);
 801         host->dev = sock;
 802         host->clk_div = 61;
 803         init_waitqueue_head(&host->can_eject);
 804         INIT_WORK(&host->cmd_handler, tifm_sd_register_host);
 805         INIT_DELAYED_WORK(&host->abort_handler, tifm_sd_abort);
 806
 807         tifm_set_drvdata(sock, mmc);
 808         sock->signal_irq = tifm_sd_signal_irq;
 809
 810         host->clk_freq = 20000000;
 811         host->timeout_jiffies = msecs_to_jiffies(1000);
 812
 813         tifm_sd_ops.request = no_dma ? tifm_sd_request_nodma : tifm_sd_request;
 814         mmc->ops = &tifm_sd_ops;
 815         mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
 816         mmc->caps = MMC_CAP_4_BIT_DATA;
 817         mmc->f_min = 20000000 / 60;
 818         mmc->f_max = 24000000;
 819         mmc->max_hw_segs = 1;
 820         mmc->max_phys_segs = 1;
 821         mmc->max_sectors = 127;
 822         mmc->max_seg_size = mmc->max_sectors << 11; //2k maximum hw block length
 823
 824         writel(0, sock->addr + SOCK_MMCSD_INT_ENABLE);
 825         writel(TIFM_MMCSD_RESET, sock->addr + SOCK_MMCSD_SYSTEM_CONTROL);
 826         writel(host->clk_div | TIFM_MMCSD_POWER,
 827                         sock->addr + SOCK_MMCSD_CONFIG);
 828
 829         for (rc = 0; rc < 50; rc++) {
 830                 /* Wait for reset ack */
 831                 if (1 & readl(sock->addr + SOCK_MMCSD_SYSTEM_STATUS)) {
 832                         rc = 0;
 833                         break;
 834                 }
 835                 msleep(10);
 836         }
 837
 838         if (rc) {
 839                 printk(KERN_ERR DRIVER_NAME
 840                         ": card not ready - probe failed\n");
 841                 mmc_free_host(mmc);
 842                 return -ENODEV;
 843         }
 844
 845         writel(0, sock->addr + SOCK_MMCSD_NUM_BLOCKS);
 846         writel(host->clk_div | TIFM_MMCSD_POWER,
 847                         sock->addr + SOCK_MMCSD_CONFIG);
 848         writel(TIFM_MMCSD_RXDE, sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
 849         writel(TIFM_MMCSD_DATAMASK | TIFM_MMCSD_ERRMASK,
 850                         sock->addr + SOCK_MMCSD_INT_ENABLE);
 851
 852         writel(64, sock->addr + SOCK_MMCSD_COMMAND_TO); // command timeout 64 clocks for now
 853         writel(TIFM_MMCSD_INAB, sock->addr + SOCK_MMCSD_COMMAND);
 854         writel(host->clk_div | TIFM_MMCSD_POWER,
 855                         sock->addr + SOCK_MMCSD_CONFIG);
 856
 857         queue_delayed_work(sock->wq, &host->abort_handler,
 858                         host->timeout_jiffies);
 859
 860         return 0;
 861 }
 862
 863 static int tifm_sd_host_is_down(struct tifm_dev *sock)
 864 {
 865         struct mmc_host *mmc = tifm_get_drvdata(sock);
 866         struct tifm_sd *host = mmc_priv(mmc);
 867         unsigned long flags;
 868         int rc = 0;
 869
 870         spin_lock_irqsave(&sock->lock, flags);
 871         rc = (host->flags & EJECT_DONE);
 872         spin_unlock_irqrestore(&sock->lock, flags);
 873         return rc;
 874 }
 875
 876 static void tifm_sd_remove(struct tifm_dev *sock)
 877 {
 878         struct mmc_host *mmc = tifm_get_drvdata(sock);
 879         struct tifm_sd *host = mmc_priv(mmc);
 880         unsigned long flags;
 881
 882         spin_lock_irqsave(&sock->lock, flags);
 883         host->flags |= EJECT;
 884         if (host->req)
 885                 queue_work(sock->wq, &host->cmd_handler);
 886         spin_unlock_irqrestore(&sock->lock, flags);
 887         wait_event_timeout(host->can_eject, tifm_sd_host_is_down(sock),
 888                                 host->timeout_jiffies);
 889
 890         if (host->flags & HOST_REG)
 891                 mmc_remove_host(mmc);
 892
 893         /* The meaning of the bit majority in this constant is unknown. */
 894         writel(0xfff8 & readl(sock->addr + SOCK_CONTROL),
 895                 sock->addr + SOCK_CONTROL);
 896         writel(0, sock->addr + SOCK_MMCSD_INT_ENABLE);
 897         writel(TIFM_FIFO_INT_SETALL,
 898                 sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
 899         writel(0, sock->addr + SOCK_DMA_FIFO_INT_ENABLE_SET);
 900
 901         tifm_set_drvdata(sock, NULL);
 902         mmc_free_host(mmc);
 903 }
 904
 905 static tifm_media_id tifm_sd_id_tbl[] = {
 906         FM_SD, 0
 907 };
 908
 909 static struct tifm_driver tifm_sd_driver = {
 910         .driver = {
 911                 .name  = DRIVER_NAME,
 912                 .owner = THIS_MODULE
 913         },
 914         .id_table = tifm_sd_id_tbl,
 915         .probe    = tifm_sd_probe,
 916         .remove   = tifm_sd_remove
 917 };
 918
 919 static int __init tifm_sd_init(void)
 920 {
 921         return tifm_register_driver(&tifm_sd_driver);
 922 }
 923
 924 static void __exit tifm_sd_exit(void)
 925 {
 926         tifm_unregister_driver(&tifm_sd_driver);
 927 }
 928
 929 MODULE_AUTHOR("Alex Dubov");
 930 MODULE_DESCRIPTION("TI FlashMedia SD driver");
 931 MODULE_LICENSE("GPL");
 932 MODULE_DEVICE_TABLE(tifm, tifm_sd_id_tbl);
 933 MODULE_VERSION(DRIVER_VERSION);
 934
 935 module_init(tifm_sd_init);
 936 module_exit(tifm_sd_exit);