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