err.no Git - linux-2.6/blob - 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 "0.7"
  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_kmap_atomic(struct mmc_data *data)
 111 {
 112         return kmap_atomic(data->sg->page, KM_BIO_SRC_IRQ) + data->sg->offset;
 113 }
 114
 115 static void tifm_sd_kunmap_atomic(char *buffer, struct mmc_data *data)
 116 {
 117         kunmap_atomic(buffer - data->sg->offset, KM_BIO_SRC_IRQ);
 118 }
 119
 120 static int tifm_sd_transfer_data(struct tifm_dev *sock, struct tifm_sd *host,
 121                                  unsigned int host_status)
 122 {
 123         struct mmc_command *cmd = host->req->cmd;
 124         unsigned int t_val = 0, cnt = 0;
 125         char *buffer;
 126
 127         if (host_status & TIFM_MMCSD_BRS) {
 128                 /* in non-dma rx mode BRS fires when fifo is still not empty */
 129                 if (no_dma && (cmd->data->flags & MMC_DATA_READ)) {
 130                         buffer = tifm_sd_kmap_atomic(host->req->data);
 131                         while (host->buffer_size > host->buffer_pos) {
 132                                 t_val = readl(sock->addr + SOCK_MMCSD_DATA);
 133                                 buffer[host->buffer_pos++] = t_val & 0xff;
 134                                 buffer[host->buffer_pos++] =
 135                                                         (t_val >> 8) & 0xff;
 136                         }
 137                         tifm_sd_kunmap_atomic(buffer, host->req->data);
 138                 }
 139                 return 1;
 140         } else if (no_dma) {
 141                 buffer = tifm_sd_kmap_atomic(host->req->data);
 142                 if ((cmd->data->flags & MMC_DATA_READ) &&
 143                                 (host_status & TIFM_MMCSD_AF)) {
 144                         for (cnt = 0; cnt < TIFM_MMCSD_FIFO_SIZE; cnt++) {
 145                                 t_val = readl(sock->addr + SOCK_MMCSD_DATA);
 146                                 if (host->buffer_size > host->buffer_pos) {
 147                                         buffer[host->buffer_pos++] =
 148                                                         t_val & 0xff;
 149                                         buffer[host->buffer_pos++] =
 150                                                         (t_val >> 8) & 0xff;
 151                                 }
 152                         }
 153                 } else if ((cmd->data->flags & MMC_DATA_WRITE)
 154                            && (host_status & TIFM_MMCSD_AE)) {
 155                         for (cnt = 0; cnt < TIFM_MMCSD_FIFO_SIZE; cnt++) {
 156                                 if (host->buffer_size > host->buffer_pos) {
 157                                         t_val = buffer[host->buffer_pos++]
 158                                                 & 0x00ff;
 159                                         t_val |= ((buffer[host->buffer_pos++])
 160                                                   << 8) & 0xff00;
 161                                         writel(t_val,
 162                                                sock->addr + SOCK_MMCSD_DATA);
 163                                 }
 164                         }
 165                 }
 166                 tifm_sd_kunmap_atomic(buffer, host->req->data);
 167         }
 168         return 0;
 169 }
 170
 171 static unsigned int tifm_sd_op_flags(struct mmc_command *cmd)
 172 {
 173         unsigned int rc = 0;
 174
 175         switch (mmc_resp_type(cmd)) {
 176         case MMC_RSP_NONE:
 177                 rc |= TIFM_MMCSD_RSP_R0;
 178                 break;
 179         case MMC_RSP_R1B:
 180                 rc |= TIFM_MMCSD_RSP_BUSY; // deliberate fall-through
 181         case MMC_RSP_R1:
 182                 rc |= TIFM_MMCSD_RSP_R1;
 183                 break;
 184         case MMC_RSP_R2:
 185                 rc |= TIFM_MMCSD_RSP_R2;
 186                 break;
 187         case MMC_RSP_R3:
 188                 rc |= TIFM_MMCSD_RSP_R3;
 189                 break;
 190         default:
 191                 BUG();
 192         }
 193
 194         switch (mmc_cmd_type(cmd)) {
 195         case MMC_CMD_BC:
 196                 rc |= TIFM_MMCSD_CMD_BC;
 197                 break;
 198         case MMC_CMD_BCR:
 199                 rc |= TIFM_MMCSD_CMD_BCR;
 200                 break;
 201         case MMC_CMD_AC:
 202                 rc |= TIFM_MMCSD_CMD_AC;
 203                 break;
 204         case MMC_CMD_ADTC:
 205                 rc |= TIFM_MMCSD_CMD_ADTC;
 206                 break;
 207         default:
 208                 BUG();
 209         }
 210         return rc;
 211 }
 212
 213 static void tifm_sd_exec(struct tifm_sd *host, struct mmc_command *cmd)
 214 {
 215         struct tifm_dev *sock = host->dev;
 216         unsigned int cmd_mask = tifm_sd_op_flags(cmd) |
 217                                 (host->flags & OPENDRAIN);
 218
 219         if (cmd->data && (cmd->data->flags & MMC_DATA_READ))
 220                 cmd_mask |= TIFM_MMCSD_READ;
 221
 222         dev_dbg(&sock->dev, "executing opcode 0x%x, arg: 0x%x, mask: 0x%x\n",
 223                 cmd->opcode, cmd->arg, cmd_mask);
 224
 225         writel((cmd->arg >> 16) & 0xffff, sock->addr + SOCK_MMCSD_ARG_HIGH);
 226         writel(cmd->arg & 0xffff, sock->addr + SOCK_MMCSD_ARG_LOW);
 227         writel(cmd->opcode | cmd_mask, sock->addr + SOCK_MMCSD_COMMAND);
 228 }
 229
 230 static void tifm_sd_fetch_resp(struct mmc_command *cmd, struct tifm_dev *sock)
 231 {
 232         cmd->resp[0] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x1c) << 16)
 233                        | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x18);
 234         cmd->resp[1] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x14) << 16)
 235                        | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x10);
 236         cmd->resp[2] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x0c) << 16)
 237                        | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x08);
 238         cmd->resp[3] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x04) << 16)
 239                        | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x00);
 240 }
 241
 242 static void tifm_sd_process_cmd(struct tifm_dev *sock, struct tifm_sd *host,
 243                                        unsigned int host_status)
 244 {
 245         struct mmc_command *cmd = host->req->cmd;
 246
 247 change_state:
 248         switch (host->state) {
 249         case IDLE:
 250                 return;
 251         case CMD:
 252                 if (host_status & TIFM_MMCSD_EOC) {
 253                         tifm_sd_fetch_resp(cmd, sock);
 254                         if (cmd->data) {
 255                                 host->state = BRS;
 256                         } else {
 257                                 host->state = READY;
 258                         }
 259                         goto change_state;
 260                 }
 261                 break;
 262         case BRS:
 263                 if (tifm_sd_transfer_data(sock, host, host_status)) {
 264                         if (cmd->data->flags & MMC_DATA_WRITE) {
 265                                 host->state = CARD;
 266                         } else {
 267                                 if (no_dma) {
 268                                         if (host->req->stop) {
 269                                                 tifm_sd_exec(host, host->req->stop);
 270                                                 host->state = SCMD;
 271                                         } else {
 272                                                 host->state = READY;
 273                                         }
 274                                 } else {
 275                                         host->state = FIFO;
 276                                 }
 277                         }
 278                         goto change_state;
 279                 }
 280                 break;
 281         case SCMD:
 282                 if (host_status & TIFM_MMCSD_EOC) {
 283                         tifm_sd_fetch_resp(host->req->stop, sock);
 284                         host->state = READY;
 285                         goto change_state;
 286                 }
 287                 break;
 288         case CARD:
 289                 dev_dbg(&sock->dev, "waiting for CARD, have %zd blocks\n",
 290                         host->written_blocks);
 291                 if (!(host->flags & CARD_BUSY)
 292                     && (host->written_blocks == cmd->data->blocks)) {
 293                         if (no_dma) {
 294                                 if (host->req->stop) {
 295                                         tifm_sd_exec(host, host->req->stop);
 296                                         host->state = SCMD;
 297                                 } else {
 298                                         host->state = READY;
 299                                 }
 300                         } else {
 301                                 host->state = FIFO;
 302                         }
 303                         goto change_state;
 304                 }
 305                 break;
 306         case FIFO:
 307                 if (host->flags & FIFO_RDY) {
 308                         host->flags &= ~FIFO_RDY;
 309                         if (host->req->stop) {
 310                                 tifm_sd_exec(host, host->req->stop);
 311                                 host->state = SCMD;
 312                         } else {
 313                                 host->state = READY;
 314                         }
 315                         goto change_state;
 316                 }
 317                 break;
 318         case READY:
 319                 tasklet_schedule(&host->finish_tasklet);
 320                 return;
 321         }
 322
 323 }
 324
 325 /* Called from interrupt handler */
 326 static unsigned int tifm_sd_signal_irq(struct tifm_dev *sock,
 327                                        unsigned int sock_irq_status)
 328 {
 329         struct tifm_sd *host;
 330         unsigned int host_status = 0, fifo_status = 0;
 331         int error_code = 0;
 332
 333         spin_lock(&sock->lock);
 334         host = mmc_priv((struct mmc_host*)tifm_get_drvdata(sock));
 335
 336         if (sock_irq_status & FIFO_EVENT) {
 337                 fifo_status = readl(sock->addr + SOCK_DMA_FIFO_STATUS);
 338                 writel(fifo_status, sock->addr + SOCK_DMA_FIFO_STATUS);
 339
 340                 host->flags |= fifo_status & FIFO_RDY;
 341         }
 342
 343         if (sock_irq_status & CARD_EVENT) {
 344                 host_status = readl(sock->addr + SOCK_MMCSD_STATUS);
 345                 writel(host_status, sock->addr + SOCK_MMCSD_STATUS);
 346
 347                 if (!host->req)
 348                         goto done;
 349
 350                 if (host_status & TIFM_MMCSD_ERRMASK) {
 351                         if (host_status & TIFM_MMCSD_CERR)
 352                                 error_code = MMC_ERR_FAILED;
 353                         else if (host_status
 354                                  & (TIFM_MMCSD_CTO | TIFM_MMCSD_DTO))
 355                                 error_code = MMC_ERR_TIMEOUT;
 356                         else if (host_status
 357                                  & (TIFM_MMCSD_CCRC | TIFM_MMCSD_DCRC))
 358                                 error_code = MMC_ERR_BADCRC;
 359
 360                         writel(TIFM_FIFO_INT_SETALL,
 361                                sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
 362                         writel(TIFM_DMA_RESET, sock->addr + SOCK_DMA_CONTROL);
 363
 364                         if (host->req->stop) {
 365                                 if (host->state == SCMD) {
 366                                         host->req->stop->error = error_code;
 367                                 } else if (host->state == BRS
 368                                            || host->state == CARD
 369                                            || host->state == FIFO) {
 370                                         host->req->cmd->error = error_code;
 371                                         tifm_sd_exec(host, host->req->stop);
 372                                         host->state = SCMD;
 373                                         goto done;
 374                                 } else {
 375                                         host->req->cmd->error = error_code;
 376                                 }
 377                         } else {
 378                                 host->req->cmd->error = error_code;
 379                         }
 380                         host->state = READY;
 381                 }
 382
 383                 if (host_status & TIFM_MMCSD_CB)
 384                         host->flags |= CARD_BUSY;
 385                 if ((host_status & TIFM_MMCSD_EOFB)
 386                     && (host->flags & CARD_BUSY)) {
 387                         host->written_blocks++;
 388                         host->flags &= ~CARD_BUSY;
 389                 }
 390         }
 391
 392         if (host->req)
 393                 tifm_sd_process_cmd(sock, host, host_status);
 394 done:
 395         dev_dbg(&sock->dev, "host_status %x, fifo_status %x\n",
 396                 host_status, fifo_status);
 397         spin_unlock(&sock->lock);
 398         return sock_irq_status;
 399 }
 400
 401 static void tifm_sd_prepare_data(struct tifm_sd *host, struct mmc_command *cmd)
 402 {
 403         struct tifm_dev *sock = host->dev;
 404         unsigned int dest_cnt;
 405
 406         /* DMA style IO */
 407         dev_dbg(&sock->dev, "setting dma for %d blocks\n",
 408                 cmd->data->blocks);
 409         writel(TIFM_FIFO_INT_SETALL,
 410                sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
 411         writel(ilog2(cmd->data->blksz) - 2,
 412                sock->addr + SOCK_FIFO_PAGE_SIZE);
 413         writel(TIFM_FIFO_ENABLE, sock->addr + SOCK_FIFO_CONTROL);
 414         writel(TIFM_FIFO_INTMASK, sock->addr + SOCK_DMA_FIFO_INT_ENABLE_SET);
 415
 416         dest_cnt = (cmd->data->blocks) << 8;
 417
 418         writel(sg_dma_address(cmd->data->sg), sock->addr + SOCK_DMA_ADDRESS);
 419
 420         writel(cmd->data->blocks - 1, sock->addr + SOCK_MMCSD_NUM_BLOCKS);
 421         writel(cmd->data->blksz - 1, sock->addr + SOCK_MMCSD_BLOCK_LEN);
 422
 423         if (cmd->data->flags & MMC_DATA_WRITE) {
 424                 writel(TIFM_MMCSD_TXDE, sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
 425                 writel(dest_cnt | TIFM_DMA_TX | TIFM_DMA_EN,
 426                        sock->addr + SOCK_DMA_CONTROL);
 427         } else {
 428                 writel(TIFM_MMCSD_RXDE, sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
 429                 writel(dest_cnt | TIFM_DMA_EN, sock->addr + SOCK_DMA_CONTROL);
 430         }
 431 }
 432
 433 static void tifm_sd_set_data_timeout(struct tifm_sd *host,
 434                                      struct mmc_data *data)
 435 {
 436         struct tifm_dev *sock = host->dev;
 437         unsigned int data_timeout = data->timeout_clks;
 438
 439         if (fixed_timeout)
 440                 return;
 441
 442         data_timeout += data->timeout_ns /
 443                         ((1000000000UL / host->clk_freq) * host->clk_div);
 444
 445         if (data_timeout < 0xffff) {
 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         } else {
 451                 data_timeout = (data_timeout >> 10) + 1;
 452                 if (data_timeout > 0xffff)
 453                         data_timeout = 0;       /* set to unlimited */
 454                 writel(data_timeout, sock->addr + SOCK_MMCSD_DATA_TO);
 455                 writel(TIFM_MMCSD_DPE
 456                        | readl(sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG),
 457                        sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG);
 458         }
 459 }
 460
 461 static void tifm_sd_request(struct mmc_host *mmc, struct mmc_request *mrq)
 462 {
 463         struct tifm_sd *host = mmc_priv(mmc);
 464         struct tifm_dev *sock = host->dev;
 465         unsigned long flags;
 466         int sg_count = 0;
 467         struct mmc_data *r_data = mrq->cmd->data;
 468
 469         spin_lock_irqsave(&sock->lock, flags);
 470         if (host->flags & EJECT) {
 471                 spin_unlock_irqrestore(&sock->lock, flags);
 472                 goto err_out;
 473         }
 474
 475         if (host->req) {
 476                 printk(KERN_ERR DRIVER_NAME ": unfinished request detected\n");
 477                 spin_unlock_irqrestore(&sock->lock, flags);
 478                 goto err_out;
 479         }
 480
 481         if (r_data) {
 482                 tifm_sd_set_data_timeout(host, r_data);
 483
 484                 sg_count = tifm_map_sg(sock, r_data->sg, r_data->sg_len,
 485                                        mrq->cmd->flags & MMC_DATA_WRITE
 486                                        ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
 487                 if (sg_count != 1) {
 488                         printk(KERN_ERR DRIVER_NAME
 489                                 ": scatterlist map failed\n");
 490                         spin_unlock_irqrestore(&sock->lock, flags);
 491                         goto err_out;
 492                 }
 493
 494                 host->written_blocks = 0;
 495                 host->flags &= ~CARD_BUSY;
 496                 tifm_sd_prepare_data(host, mrq->cmd);
 497         }
 498
 499         host->req = mrq;
 500         mod_timer(&host->timer, jiffies + host->timeout_jiffies);
 501         host->state = CMD;
 502         writel(TIFM_CTRL_LED | readl(sock->addr + SOCK_CONTROL),
 503                sock->addr + SOCK_CONTROL);
 504         tifm_sd_exec(host, mrq->cmd);
 505         spin_unlock_irqrestore(&sock->lock, flags);
 506         return;
 507
 508 err_out:
 509         if (sg_count > 0)
 510                 tifm_unmap_sg(sock, r_data->sg, r_data->sg_len,
 511                               (r_data->flags & MMC_DATA_WRITE)
 512                               ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
 513
 514         mrq->cmd->error = MMC_ERR_TIMEOUT;
 515         mmc_request_done(mmc, mrq);
 516 }
 517
 518 static void tifm_sd_end_cmd(unsigned long data)
 519 {
 520         struct tifm_sd *host = (struct tifm_sd*)data;
 521         struct tifm_dev *sock = host->dev;
 522         struct mmc_host *mmc = tifm_get_drvdata(sock);
 523         struct mmc_request *mrq;
 524         struct mmc_data *r_data = NULL;
 525         unsigned long flags;
 526
 527         spin_lock_irqsave(&sock->lock, flags);
 528
 529         del_timer(&host->timer);
 530         mrq = host->req;
 531         host->req = NULL;
 532         host->state = IDLE;
 533
 534         if (!mrq) {
 535                 printk(KERN_ERR DRIVER_NAME ": no request to complete?\n");
 536                 spin_unlock_irqrestore(&sock->lock, flags);
 537                 return;
 538         }
 539
 540         r_data = mrq->cmd->data;
 541         if (r_data) {
 542                 if (r_data->flags & MMC_DATA_WRITE) {
 543                         r_data->bytes_xfered = host->written_blocks
 544                                                * r_data->blksz;
 545                 } else {
 546                         r_data->bytes_xfered = r_data->blocks -
 547                                 readl(sock->addr + SOCK_MMCSD_NUM_BLOCKS) - 1;
 548                         r_data->bytes_xfered *= r_data->blksz;
 549                         r_data->bytes_xfered += r_data->blksz -
 550                                 readl(sock->addr + SOCK_MMCSD_BLOCK_LEN) + 1;
 551                 }
 552                 tifm_unmap_sg(sock, r_data->sg, r_data->sg_len,
 553                               (r_data->flags & MMC_DATA_WRITE)
 554                               ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
 555         }
 556
 557         writel((~TIFM_CTRL_LED) & readl(sock->addr + SOCK_CONTROL),
 558                sock->addr + SOCK_CONTROL);
 559
 560         spin_unlock_irqrestore(&sock->lock, flags);
 561         mmc_request_done(mmc, mrq);
 562 }
 563
 564 static void tifm_sd_request_nodma(struct mmc_host *mmc, struct mmc_request *mrq)
 565 {
 566         struct tifm_sd *host = mmc_priv(mmc);
 567         struct tifm_dev *sock = host->dev;
 568         unsigned long flags;
 569         struct mmc_data *r_data = mrq->cmd->data;
 570
 571         spin_lock_irqsave(&sock->lock, flags);
 572         if (host->flags & EJECT) {
 573                 spin_unlock_irqrestore(&sock->lock, flags);
 574                 goto err_out;
 575         }
 576
 577         if (host->req) {
 578                 printk(KERN_ERR DRIVER_NAME ": unfinished request detected\n");
 579                 spin_unlock_irqrestore(&sock->lock, flags);
 580                 goto err_out;
 581         }
 582
 583         if (r_data) {
 584                 tifm_sd_set_data_timeout(host, r_data);
 585
 586                 host->buffer_size = mrq->cmd->data->blocks
 587                                     * mrq->cmd->data->blksz;
 588
 589                 writel(TIFM_MMCSD_BUFINT
 590                        | readl(sock->addr + SOCK_MMCSD_INT_ENABLE),
 591                        sock->addr + SOCK_MMCSD_INT_ENABLE);
 592                 writel(((TIFM_MMCSD_FIFO_SIZE - 1) << 8)
 593                        | (TIFM_MMCSD_FIFO_SIZE - 1),
 594                        sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
 595
 596                 host->written_blocks = 0;
 597                 host->flags &= ~CARD_BUSY;
 598                 host->buffer_pos = 0;
 599                 writel(r_data->blocks - 1, sock->addr + SOCK_MMCSD_NUM_BLOCKS);
 600                 writel(r_data->blksz - 1, sock->addr + SOCK_MMCSD_BLOCK_LEN);
 601         }
 602
 603         host->req = mrq;
 604         mod_timer(&host->timer, jiffies + host->timeout_jiffies);
 605         host->state = CMD;
 606         writel(TIFM_CTRL_LED | readl(sock->addr + SOCK_CONTROL),
 607                sock->addr + SOCK_CONTROL);
 608         tifm_sd_exec(host, mrq->cmd);
 609         spin_unlock_irqrestore(&sock->lock, flags);
 610         return;
 611
 612 err_out:
 613         mrq->cmd->error = MMC_ERR_TIMEOUT;
 614         mmc_request_done(mmc, mrq);
 615 }
 616
 617 static void tifm_sd_end_cmd_nodma(unsigned long data)
 618 {
 619         struct tifm_sd *host = (struct tifm_sd*)data;
 620         struct tifm_dev *sock = host->dev;
 621         struct mmc_host *mmc = tifm_get_drvdata(sock);
 622         struct mmc_request *mrq;
 623         struct mmc_data *r_data = NULL;
 624         unsigned long flags;
 625
 626         spin_lock_irqsave(&sock->lock, flags);
 627
 628         del_timer(&host->timer);
 629         mrq = host->req;
 630         host->req = NULL;
 631         host->state = IDLE;
 632
 633         if (!mrq) {
 634                 printk(KERN_ERR DRIVER_NAME ": no request to complete?\n");
 635                 spin_unlock_irqrestore(&sock->lock, flags);
 636                 return;
 637         }
 638
 639         r_data = mrq->cmd->data;
 640         if (r_data) {
 641                 writel((~TIFM_MMCSD_BUFINT) &
 642                         readl(sock->addr + SOCK_MMCSD_INT_ENABLE),
 643                         sock->addr + SOCK_MMCSD_INT_ENABLE);
 644
 645                 if (r_data->flags & MMC_DATA_WRITE) {
 646                         r_data->bytes_xfered = host->written_blocks
 647                                                * r_data->blksz;
 648                 } else {
 649                         r_data->bytes_xfered = r_data->blocks -
 650                                 readl(sock->addr + SOCK_MMCSD_NUM_BLOCKS) - 1;
 651                         r_data->bytes_xfered *= r_data->blksz;
 652                         r_data->bytes_xfered += r_data->blksz -
 653                                 readl(sock->addr + SOCK_MMCSD_BLOCK_LEN) + 1;
 654                 }
 655                 host->buffer_pos = 0;
 656                 host->buffer_size = 0;
 657         }
 658
 659         writel((~TIFM_CTRL_LED) & readl(sock->addr + SOCK_CONTROL),
 660                sock->addr + SOCK_CONTROL);
 661
 662         spin_unlock_irqrestore(&sock->lock, flags);
 663
 664         mmc_request_done(mmc, mrq);
 665 }
 666
 667 static void tifm_sd_terminate(struct tifm_sd *host)
 668 {
 669         struct tifm_dev *sock = host->dev;
 670         unsigned long flags;
 671
 672         writel(0, sock->addr + SOCK_MMCSD_INT_ENABLE);
 673         mmiowb();
 674         spin_lock_irqsave(&sock->lock, flags);
 675         host->flags |= EJECT;
 676         if (host->req) {
 677                 writel(TIFM_FIFO_INT_SETALL,
 678                        sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
 679                 writel(0, sock->addr + SOCK_DMA_FIFO_INT_ENABLE_SET);
 680                 tasklet_schedule(&host->finish_tasklet);
 681         }
 682         spin_unlock_irqrestore(&sock->lock, flags);
 683 }
 684
 685 static void tifm_sd_abort(unsigned long data)
 686 {
 687         struct tifm_sd *host = (struct tifm_sd*)data;
 688
 689         printk(KERN_ERR DRIVER_NAME
 690                ": card failed to respond for a long period of time");
 691
 692         tifm_sd_terminate(host);
 693         tifm_eject(host->dev);
 694 }
 695
 696 static void tifm_sd_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 697 {
 698         struct tifm_sd *host = mmc_priv(mmc);
 699         struct tifm_dev *sock = host->dev;
 700         unsigned int clk_div1, clk_div2;
 701         unsigned long flags;
 702
 703         spin_lock_irqsave(&sock->lock, flags);
 704
 705         dev_dbg(&sock->dev, "Setting bus width %d, power %d\n", ios->bus_width,
 706                 ios->power_mode);
 707         if (ios->bus_width == MMC_BUS_WIDTH_4) {
 708                 writel(TIFM_MMCSD_4BBUS | readl(sock->addr + SOCK_MMCSD_CONFIG),
 709                        sock->addr + SOCK_MMCSD_CONFIG);
 710         } else {
 711                 writel((~TIFM_MMCSD_4BBUS)
 712                        & readl(sock->addr + SOCK_MMCSD_CONFIG),
 713                        sock->addr + SOCK_MMCSD_CONFIG);
 714         }
 715
 716         if (ios->clock) {
 717                 clk_div1 = 20000000 / ios->clock;
 718                 if (!clk_div1)
 719                         clk_div1 = 1;
 720
 721                 clk_div2 = 24000000 / ios->clock;
 722                 if (!clk_div2)
 723                         clk_div2 = 1;
 724
 725                 if ((20000000 / clk_div1) > ios->clock)
 726                         clk_div1++;
 727                 if ((24000000 / clk_div2) > ios->clock)
 728                         clk_div2++;
 729                 if ((20000000 / clk_div1) > (24000000 / clk_div2)) {
 730                         host->clk_freq = 20000000;
 731                         host->clk_div = clk_div1;
 732                         writel((~TIFM_CTRL_FAST_CLK)
 733                                & readl(sock->addr + SOCK_CONTROL),
 734                                sock->addr + SOCK_CONTROL);
 735                 } else {
 736                         host->clk_freq = 24000000;
 737                         host->clk_div = clk_div2;
 738                         writel(TIFM_CTRL_FAST_CLK
 739                                | readl(sock->addr + SOCK_CONTROL),
 740                                sock->addr + SOCK_CONTROL);
 741                 }
 742         } else {
 743                 host->clk_div = 0;
 744         }
 745         host->clk_div &= TIFM_MMCSD_CLKMASK;
 746         writel(host->clk_div
 747                | ((~TIFM_MMCSD_CLKMASK)
 748                   & readl(sock->addr + SOCK_MMCSD_CONFIG)),
 749                sock->addr + SOCK_MMCSD_CONFIG);
 750
 751         if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
 752                 host->flags |= OPENDRAIN;
 753         else
 754                 host->flags &= ~OPENDRAIN;
 755
 756         /* chip_select : maybe later */
 757         //vdd
 758         //power is set before probe / after remove
 759         //I believe, power_off when already marked for eject is sufficient to
 760         // allow removal.
 761         if ((host->flags & EJECT) && ios->power_mode == MMC_POWER_OFF) {
 762                 host->flags |= EJECT_DONE;
 763                 wake_up_all(&host->notify);
 764         }
 765
 766         spin_unlock_irqrestore(&sock->lock, flags);
 767 }
 768
 769 static int tifm_sd_ro(struct mmc_host *mmc)
 770 {
 771         int rc;
 772         struct tifm_sd *host = mmc_priv(mmc);
 773         struct tifm_dev *sock = host->dev;
 774         unsigned long flags;
 775
 776         spin_lock_irqsave(&sock->lock, flags);
 777
 778         host->flags |= (CARD_RO & readl(sock->addr + SOCK_PRESENT_STATE));
 779         rc = (host->flags & CARD_RO) ? 1 : 0;
 780
 781         spin_unlock_irqrestore(&sock->lock, flags);
 782         return rc;
 783 }
 784
 785 static struct mmc_host_ops tifm_sd_ops = {
 786         .request = tifm_sd_request,
 787         .set_ios = tifm_sd_ios,
 788         .get_ro  = tifm_sd_ro
 789 };
 790
 791 static int tifm_sd_initialize_host(struct tifm_sd *host)
 792 {
 793         int rc;
 794         unsigned int host_status = 0;
 795         struct tifm_dev *sock = host->dev;
 796
 797         writel(0, sock->addr + SOCK_MMCSD_INT_ENABLE);
 798         mmiowb();
 799         host->clk_div = 61;
 800         host->clk_freq = 20000000;
 801         writel(TIFM_MMCSD_RESET, sock->addr + SOCK_MMCSD_SYSTEM_CONTROL);
 802         writel(host->clk_div | TIFM_MMCSD_POWER,
 803                sock->addr + SOCK_MMCSD_CONFIG);
 804
 805         /* wait up to 0.51 sec for reset */
 806         for (rc = 2; rc <= 256; rc <<= 1) {
 807                 if (1 & readl(sock->addr + SOCK_MMCSD_SYSTEM_STATUS)) {
 808                         rc = 0;
 809                         break;
 810                 }
 811                 msleep(rc);
 812         }
 813
 814         if (rc) {
 815                 printk(KERN_ERR DRIVER_NAME
 816                        ": controller failed to reset\n");
 817                 return -ENODEV;
 818         }
 819
 820         writel(0, sock->addr + SOCK_MMCSD_NUM_BLOCKS);
 821         writel(host->clk_div | TIFM_MMCSD_POWER,
 822                sock->addr + SOCK_MMCSD_CONFIG);
 823         writel(TIFM_MMCSD_RXDE, sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
 824
 825         // command timeout fixed to 64 clocks for now
 826         writel(64, sock->addr + SOCK_MMCSD_COMMAND_TO);
 827         writel(TIFM_MMCSD_INAB, sock->addr + SOCK_MMCSD_COMMAND);
 828
 829         /* INAB should take much less than reset */
 830         for (rc = 1; rc <= 16; rc <<= 1) {
 831                 host_status = readl(sock->addr + SOCK_MMCSD_STATUS);
 832                 writel(host_status, sock->addr + SOCK_MMCSD_STATUS);
 833                 if (!(host_status & TIFM_MMCSD_ERRMASK)
 834                     && (host_status & TIFM_MMCSD_EOC)) {
 835                         rc = 0;
 836                         break;
 837                 }
 838                 msleep(rc);
 839         }
 840
 841         if (rc) {
 842                 printk(KERN_ERR DRIVER_NAME
 843                        ": card not ready - probe failed on initialization\n");
 844                 return -ENODEV;
 845         }
 846
 847         writel(TIFM_MMCSD_DATAMASK | TIFM_MMCSD_ERRMASK,
 848                sock->addr + SOCK_MMCSD_INT_ENABLE);
 849         mmiowb();
 850
 851         return 0;
 852 }
 853
 854 static int tifm_sd_probe(struct tifm_dev *sock)
 855 {
 856         struct mmc_host *mmc;
 857         struct tifm_sd *host;
 858         int rc = -EIO;
 859
 860         if (!(TIFM_SOCK_STATE_OCCUPIED
 861               & readl(sock->addr + SOCK_PRESENT_STATE))) {
 862                 printk(KERN_WARNING DRIVER_NAME ": card gone, unexpectedly\n");
 863                 return rc;
 864         }
 865
 866         mmc = mmc_alloc_host(sizeof(struct tifm_sd), &sock->dev);
 867         if (!mmc)
 868                 return -ENOMEM;
 869
 870         host = mmc_priv(mmc);
 871         tifm_set_drvdata(sock, mmc);
 872         host->dev = sock;
 873         host->timeout_jiffies = msecs_to_jiffies(1000);
 874
 875         init_waitqueue_head(&host->notify);
 876         tasklet_init(&host->finish_tasklet,
 877                      no_dma ? tifm_sd_end_cmd_nodma : tifm_sd_end_cmd,
 878                      (unsigned long)host);
 879         setup_timer(&host->timer, tifm_sd_abort, (unsigned long)host);
 880
 881         tifm_sd_ops.request = no_dma ? tifm_sd_request_nodma : tifm_sd_request;
 882         mmc->ops = &tifm_sd_ops;
 883         mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
 884         mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_MULTIWRITE;
 885         mmc->f_min = 20000000 / 60;
 886         mmc->f_max = 24000000;
 887         mmc->max_hw_segs = 1;
 888         mmc->max_phys_segs = 1;
 889         mmc->max_sectors = 127;
 890         mmc->max_seg_size = mmc->max_sectors << 11; //2k maximum hw block length
 891         sock->signal_irq = tifm_sd_signal_irq;
 892         rc = tifm_sd_initialize_host(host);
 893
 894         if (!rc)
 895                 rc = mmc_add_host(mmc);
 896         if (rc)
 897                 goto out_free_mmc;
 898
 899         return 0;
 900 out_free_mmc:
 901         mmc_free_host(mmc);
 902         return rc;
 903 }
 904
 905 static void tifm_sd_remove(struct tifm_dev *sock)
 906 {
 907         struct mmc_host *mmc = tifm_get_drvdata(sock);
 908         struct tifm_sd *host = mmc_priv(mmc);
 909
 910         del_timer_sync(&host->timer);
 911         tifm_sd_terminate(host);
 912         wait_event_timeout(host->notify, host->flags & EJECT_DONE,
 913                            host->timeout_jiffies);
 914         tasklet_kill(&host->finish_tasklet);
 915         mmc_remove_host(mmc);
 916
 917         /* The meaning of the bit majority in this constant is unknown. */
 918         writel(0xfff8 & readl(sock->addr + SOCK_CONTROL),
 919                sock->addr + SOCK_CONTROL);
 920
 921         tifm_set_drvdata(sock, NULL);
 922         mmc_free_host(mmc);
 923 }
 924
 925 static tifm_media_id tifm_sd_id_tbl[] = {
 926         FM_SD, 0
 927 };
 928
 929 static struct tifm_driver tifm_sd_driver = {
 930         .driver = {
 931                 .name  = DRIVER_NAME,
 932                 .owner = THIS_MODULE
 933         },
 934         .id_table = tifm_sd_id_tbl,
 935         .probe    = tifm_sd_probe,
 936         .remove   = tifm_sd_remove
 937 };
 938
 939 static int __init tifm_sd_init(void)
 940 {
 941         return tifm_register_driver(&tifm_sd_driver);
 942 }
 943
 944 static void __exit tifm_sd_exit(void)
 945 {
 946         tifm_unregister_driver(&tifm_sd_driver);
 947 }
 948
 949 MODULE_AUTHOR("Alex Dubov");
 950 MODULE_DESCRIPTION("TI FlashMedia SD driver");
 951 MODULE_LICENSE("GPL");
 952 MODULE_DEVICE_TABLE(tifm, tifm_sd_id_tbl);
 953 MODULE_VERSION(DRIVER_VERSION);
 954
 955 module_init(tifm_sd_init);
 956 module_exit(tifm_sd_exit);