linux/drivers/mmc/host/tifm_sd.c
<<
>>
Prefs
   1/*
   2 *  tifm_sd.c - TI FlashMedia driver
   3 *
   4 *  Copyright (C) 2006 Alex Dubov <oakad@yahoo.com>
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License version 2 as
   8 * published by the Free Software Foundation.
   9 *
  10 * Special thanks to Brad Campbell for extensive testing of this driver.
  11 *
  12 */
  13
  14
  15#include <linux/tifm.h>
  16#include <linux/mmc/host.h>
  17#include <linux/highmem.h>
  18#include <linux/scatterlist.h>
  19#include <linux/module.h>
  20#include <asm/io.h>
  21
  22#define DRIVER_NAME "tifm_sd"
  23#define DRIVER_VERSION "0.8"
  24
  25static bool no_dma = 0;
  26static bool fixed_timeout = 0;
  27module_param(no_dma, bool, 0644);
  28module_param(fixed_timeout, bool, 0644);
  29
  30/* Constants here are mostly from OMAP5912 datasheet */
  31#define TIFM_MMCSD_RESET      0x0002
  32#define TIFM_MMCSD_CLKMASK    0x03ff
  33#define TIFM_MMCSD_POWER      0x0800
  34#define TIFM_MMCSD_4BBUS      0x8000
  35#define TIFM_MMCSD_RXDE       0x8000   /* rx dma enable */
  36#define TIFM_MMCSD_TXDE       0x0080   /* tx dma enable */
  37#define TIFM_MMCSD_BUFINT     0x0c00   /* set bits: AE, AF */
  38#define TIFM_MMCSD_DPE        0x0020   /* data timeout counted in kilocycles */
  39#define TIFM_MMCSD_INAB       0x0080   /* abort / initialize command */
  40#define TIFM_MMCSD_READ       0x8000
  41
  42#define TIFM_MMCSD_ERRMASK    0x01e0   /* set bits: CCRC, CTO, DCRC, DTO */
  43#define TIFM_MMCSD_EOC        0x0001   /* end of command phase  */
  44#define TIFM_MMCSD_CD         0x0002   /* card detect           */
  45#define TIFM_MMCSD_CB         0x0004   /* card enter busy state */
  46#define TIFM_MMCSD_BRS        0x0008   /* block received/sent   */
  47#define TIFM_MMCSD_EOFB       0x0010   /* card exit busy state  */
  48#define TIFM_MMCSD_DTO        0x0020   /* data time-out         */
  49#define TIFM_MMCSD_DCRC       0x0040   /* data crc error        */
  50#define TIFM_MMCSD_CTO        0x0080   /* command time-out      */
  51#define TIFM_MMCSD_CCRC       0x0100   /* command crc error     */
  52#define TIFM_MMCSD_AF         0x0400   /* fifo almost full      */
  53#define TIFM_MMCSD_AE         0x0800   /* fifo almost empty     */
  54#define TIFM_MMCSD_OCRB       0x1000   /* OCR busy              */
  55#define TIFM_MMCSD_CIRQ       0x2000   /* card irq (cmd40/sdio) */
  56#define TIFM_MMCSD_CERR       0x4000   /* card status error     */
  57
  58#define TIFM_MMCSD_ODTO       0x0040   /* open drain / extended timeout */
  59#define TIFM_MMCSD_CARD_RO    0x0200   /* card is read-only     */
  60
  61#define TIFM_MMCSD_FIFO_SIZE  0x0020
  62
  63#define TIFM_MMCSD_RSP_R0     0x0000
  64#define TIFM_MMCSD_RSP_R1     0x0100
  65#define TIFM_MMCSD_RSP_R2     0x0200
  66#define TIFM_MMCSD_RSP_R3     0x0300
  67#define TIFM_MMCSD_RSP_R4     0x0400
  68#define TIFM_MMCSD_RSP_R5     0x0500
  69#define TIFM_MMCSD_RSP_R6     0x0600
  70
  71#define TIFM_MMCSD_RSP_BUSY   0x0800
  72
  73#define TIFM_MMCSD_CMD_BC     0x0000
  74#define TIFM_MMCSD_CMD_BCR    0x1000
  75#define TIFM_MMCSD_CMD_AC     0x2000
  76#define TIFM_MMCSD_CMD_ADTC   0x3000
  77
  78#define TIFM_MMCSD_MAX_BLOCK_SIZE  0x0800UL
  79
  80enum {
  81        CMD_READY    = 0x0001,
  82        FIFO_READY   = 0x0002,
  83        BRS_READY    = 0x0004,
  84        SCMD_ACTIVE  = 0x0008,
  85        SCMD_READY   = 0x0010,
  86        CARD_BUSY    = 0x0020,
  87        DATA_CARRY   = 0x0040
  88};
  89
  90struct tifm_sd {
  91        struct tifm_dev       *dev;
  92
  93        unsigned short        eject:1,
  94                              open_drain:1,
  95                              no_dma:1;
  96        unsigned short        cmd_flags;
  97
  98        unsigned int          clk_freq;
  99        unsigned int          clk_div;
 100        unsigned long         timeout_jiffies;
 101
 102        struct tasklet_struct finish_tasklet;
 103        struct timer_list     timer;
 104        struct mmc_request    *req;
 105
 106        int                   sg_len;
 107        int                   sg_pos;
 108        unsigned int          block_pos;
 109        struct scatterlist    bounce_buf;
 110        unsigned char         bounce_buf_data[TIFM_MMCSD_MAX_BLOCK_SIZE];
 111};
 112
 113/* for some reason, host won't respond correctly to readw/writew */
 114static void tifm_sd_read_fifo(struct tifm_sd *host, struct page *pg,
 115                              unsigned int off, unsigned int cnt)
 116{
 117        struct tifm_dev *sock = host->dev;
 118        unsigned char *buf;
 119        unsigned int pos = 0, val;
 120
 121        buf = kmap_atomic(pg) + off;
 122        if (host->cmd_flags & DATA_CARRY) {
 123                buf[pos++] = host->bounce_buf_data[0];
 124                host->cmd_flags &= ~DATA_CARRY;
 125        }
 126
 127        while (pos < cnt) {
 128                val = readl(sock->addr + SOCK_MMCSD_DATA);
 129                buf[pos++] = val & 0xff;
 130                if (pos == cnt) {
 131                        host->bounce_buf_data[0] = (val >> 8) & 0xff;
 132                        host->cmd_flags |= DATA_CARRY;
 133                        break;
 134                }
 135                buf[pos++] = (val >> 8) & 0xff;
 136        }
 137        kunmap_atomic(buf - off);
 138}
 139
 140static void tifm_sd_write_fifo(struct tifm_sd *host, struct page *pg,
 141                               unsigned int off, unsigned int cnt)
 142{
 143        struct tifm_dev *sock = host->dev;
 144        unsigned char *buf;
 145        unsigned int pos = 0, val;
 146
 147        buf = kmap_atomic(pg) + off;
 148        if (host->cmd_flags & DATA_CARRY) {
 149                val = host->bounce_buf_data[0] | ((buf[pos++] << 8) & 0xff00);
 150                writel(val, sock->addr + SOCK_MMCSD_DATA);
 151                host->cmd_flags &= ~DATA_CARRY;
 152        }
 153
 154        while (pos < cnt) {
 155                val = buf[pos++];
 156                if (pos == cnt) {
 157                        host->bounce_buf_data[0] = val & 0xff;
 158                        host->cmd_flags |= DATA_CARRY;
 159                        break;
 160                }
 161                val |= (buf[pos++] << 8) & 0xff00;
 162                writel(val, sock->addr + SOCK_MMCSD_DATA);
 163        }
 164        kunmap_atomic(buf - off);
 165}
 166
 167static void tifm_sd_transfer_data(struct tifm_sd *host)
 168{
 169        struct mmc_data *r_data = host->req->cmd->data;
 170        struct scatterlist *sg = r_data->sg;
 171        unsigned int off, cnt, t_size = TIFM_MMCSD_FIFO_SIZE * 2;
 172        unsigned int p_off, p_cnt;
 173        struct page *pg;
 174
 175        if (host->sg_pos == host->sg_len)
 176                return;
 177        while (t_size) {
 178                cnt = sg[host->sg_pos].length - host->block_pos;
 179                if (!cnt) {
 180                        host->block_pos = 0;
 181                        host->sg_pos++;
 182                        if (host->sg_pos == host->sg_len) {
 183                                if ((r_data->flags & MMC_DATA_WRITE)
 184                                    && (host->cmd_flags & DATA_CARRY))
 185                                        writel(host->bounce_buf_data[0],
 186                                               host->dev->addr
 187                                               + SOCK_MMCSD_DATA);
 188
 189                                return;
 190                        }
 191                        cnt = sg[host->sg_pos].length;
 192                }
 193                off = sg[host->sg_pos].offset + host->block_pos;
 194
 195                pg = nth_page(sg_page(&sg[host->sg_pos]), off >> PAGE_SHIFT);
 196                p_off = offset_in_page(off);
 197                p_cnt = PAGE_SIZE - p_off;
 198                p_cnt = min(p_cnt, cnt);
 199                p_cnt = min(p_cnt, t_size);
 200
 201                if (r_data->flags & MMC_DATA_READ)
 202                        tifm_sd_read_fifo(host, pg, p_off, p_cnt);
 203                else if (r_data->flags & MMC_DATA_WRITE)
 204                        tifm_sd_write_fifo(host, pg, p_off, p_cnt);
 205
 206                t_size -= p_cnt;
 207                host->block_pos += p_cnt;
 208        }
 209}
 210
 211static void tifm_sd_copy_page(struct page *dst, unsigned int dst_off,
 212                              struct page *src, unsigned int src_off,
 213                              unsigned int count)
 214{
 215        unsigned char *src_buf = kmap_atomic(src) + src_off;
 216        unsigned char *dst_buf = kmap_atomic(dst) + dst_off;
 217
 218        memcpy(dst_buf, src_buf, count);
 219
 220        kunmap_atomic(dst_buf - dst_off);
 221        kunmap_atomic(src_buf - src_off);
 222}
 223
 224static void tifm_sd_bounce_block(struct tifm_sd *host, struct mmc_data *r_data)
 225{
 226        struct scatterlist *sg = r_data->sg;
 227        unsigned int t_size = r_data->blksz;
 228        unsigned int off, cnt;
 229        unsigned int p_off, p_cnt;
 230        struct page *pg;
 231
 232        dev_dbg(&host->dev->dev, "bouncing block\n");
 233        while (t_size) {
 234                cnt = sg[host->sg_pos].length - host->block_pos;
 235                if (!cnt) {
 236                        host->block_pos = 0;
 237                        host->sg_pos++;
 238                        if (host->sg_pos == host->sg_len)
 239                                return;
 240                        cnt = sg[host->sg_pos].length;
 241                }
 242                off = sg[host->sg_pos].offset + host->block_pos;
 243
 244                pg = nth_page(sg_page(&sg[host->sg_pos]), off >> PAGE_SHIFT);
 245                p_off = offset_in_page(off);
 246                p_cnt = PAGE_SIZE - p_off;
 247                p_cnt = min(p_cnt, cnt);
 248                p_cnt = min(p_cnt, t_size);
 249
 250                if (r_data->flags & MMC_DATA_WRITE)
 251                        tifm_sd_copy_page(sg_page(&host->bounce_buf),
 252                                          r_data->blksz - t_size,
 253                                          pg, p_off, p_cnt);
 254                else if (r_data->flags & MMC_DATA_READ)
 255                        tifm_sd_copy_page(pg, p_off, sg_page(&host->bounce_buf),
 256                                          r_data->blksz - t_size, p_cnt);
 257
 258                t_size -= p_cnt;
 259                host->block_pos += p_cnt;
 260        }
 261}
 262
 263static int tifm_sd_set_dma_data(struct tifm_sd *host, struct mmc_data *r_data)
 264{
 265        struct tifm_dev *sock = host->dev;
 266        unsigned int t_size = TIFM_DMA_TSIZE * r_data->blksz;
 267        unsigned int dma_len, dma_blk_cnt, dma_off;
 268        struct scatterlist *sg = NULL;
 269        unsigned long flags;
 270
 271        if (host->sg_pos == host->sg_len)
 272                return 1;
 273
 274        if (host->cmd_flags & DATA_CARRY) {
 275                host->cmd_flags &= ~DATA_CARRY;
 276                local_irq_save(flags);
 277                tifm_sd_bounce_block(host, r_data);
 278                local_irq_restore(flags);
 279                if (host->sg_pos == host->sg_len)
 280                        return 1;
 281        }
 282
 283        dma_len = sg_dma_len(&r_data->sg[host->sg_pos]) - host->block_pos;
 284        if (!dma_len) {
 285                host->block_pos = 0;
 286                host->sg_pos++;
 287                if (host->sg_pos == host->sg_len)
 288                        return 1;
 289                dma_len = sg_dma_len(&r_data->sg[host->sg_pos]);
 290        }
 291
 292        if (dma_len < t_size) {
 293                dma_blk_cnt = dma_len / r_data->blksz;
 294                dma_off = host->block_pos;
 295                host->block_pos += dma_blk_cnt * r_data->blksz;
 296        } else {
 297                dma_blk_cnt = TIFM_DMA_TSIZE;
 298                dma_off = host->block_pos;
 299                host->block_pos += t_size;
 300        }
 301
 302        if (dma_blk_cnt)
 303                sg = &r_data->sg[host->sg_pos];
 304        else if (dma_len) {
 305                if (r_data->flags & MMC_DATA_WRITE) {
 306                        local_irq_save(flags);
 307                        tifm_sd_bounce_block(host, r_data);
 308                        local_irq_restore(flags);
 309                } else
 310                        host->cmd_flags |= DATA_CARRY;
 311
 312                sg = &host->bounce_buf;
 313                dma_off = 0;
 314                dma_blk_cnt = 1;
 315        } else
 316                return 1;
 317
 318        dev_dbg(&sock->dev, "setting dma for %d blocks\n", dma_blk_cnt);
 319        writel(sg_dma_address(sg) + dma_off, sock->addr + SOCK_DMA_ADDRESS);
 320        if (r_data->flags & MMC_DATA_WRITE)
 321                writel((dma_blk_cnt << 8) | TIFM_DMA_TX | TIFM_DMA_EN,
 322                       sock->addr + SOCK_DMA_CONTROL);
 323        else
 324                writel((dma_blk_cnt << 8) | TIFM_DMA_EN,
 325                       sock->addr + SOCK_DMA_CONTROL);
 326
 327        return 0;
 328}
 329
 330static unsigned int tifm_sd_op_flags(struct mmc_command *cmd)
 331{
 332        unsigned int rc = 0;
 333
 334        switch (mmc_resp_type(cmd)) {
 335        case MMC_RSP_NONE:
 336                rc |= TIFM_MMCSD_RSP_R0;
 337                break;
 338        case MMC_RSP_R1B:
 339                rc |= TIFM_MMCSD_RSP_BUSY; // deliberate fall-through
 340        case MMC_RSP_R1:
 341                rc |= TIFM_MMCSD_RSP_R1;
 342                break;
 343        case MMC_RSP_R2:
 344                rc |= TIFM_MMCSD_RSP_R2;
 345                break;
 346        case MMC_RSP_R3:
 347                rc |= TIFM_MMCSD_RSP_R3;
 348                break;
 349        default:
 350                BUG();
 351        }
 352
 353        switch (mmc_cmd_type(cmd)) {
 354        case MMC_CMD_BC:
 355                rc |= TIFM_MMCSD_CMD_BC;
 356                break;
 357        case MMC_CMD_BCR:
 358                rc |= TIFM_MMCSD_CMD_BCR;
 359                break;
 360        case MMC_CMD_AC:
 361                rc |= TIFM_MMCSD_CMD_AC;
 362                break;
 363        case MMC_CMD_ADTC:
 364                rc |= TIFM_MMCSD_CMD_ADTC;
 365                break;
 366        default:
 367                BUG();
 368        }
 369        return rc;
 370}
 371
 372static void tifm_sd_exec(struct tifm_sd *host, struct mmc_command *cmd)
 373{
 374        struct tifm_dev *sock = host->dev;
 375        unsigned int cmd_mask = tifm_sd_op_flags(cmd);
 376
 377        if (host->open_drain)
 378                cmd_mask |= TIFM_MMCSD_ODTO;
 379
 380        if (cmd->data && (cmd->data->flags & MMC_DATA_READ))
 381                cmd_mask |= TIFM_MMCSD_READ;
 382
 383        dev_dbg(&sock->dev, "executing opcode 0x%x, arg: 0x%x, mask: 0x%x\n",
 384                cmd->opcode, cmd->arg, cmd_mask);
 385
 386        writel((cmd->arg >> 16) & 0xffff, sock->addr + SOCK_MMCSD_ARG_HIGH);
 387        writel(cmd->arg & 0xffff, sock->addr + SOCK_MMCSD_ARG_LOW);
 388        writel(cmd->opcode | cmd_mask, sock->addr + SOCK_MMCSD_COMMAND);
 389}
 390
 391static void tifm_sd_fetch_resp(struct mmc_command *cmd, struct tifm_dev *sock)
 392{
 393        cmd->resp[0] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x1c) << 16)
 394                       | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x18);
 395        cmd->resp[1] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x14) << 16)
 396                       | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x10);
 397        cmd->resp[2] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x0c) << 16)
 398                       | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x08);
 399        cmd->resp[3] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x04) << 16)
 400                       | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x00);
 401}
 402
 403static void tifm_sd_check_status(struct tifm_sd *host)
 404{
 405        struct tifm_dev *sock = host->dev;
 406        struct mmc_command *cmd = host->req->cmd;
 407
 408        if (cmd->error)
 409                goto finish_request;
 410
 411        if (!(host->cmd_flags & CMD_READY))
 412                return;
 413
 414        if (cmd->data) {
 415                if (cmd->data->error) {
 416                        if ((host->cmd_flags & SCMD_ACTIVE)
 417                            && !(host->cmd_flags & SCMD_READY))
 418                                return;
 419
 420                        goto finish_request;
 421                }
 422
 423                if (!(host->cmd_flags & BRS_READY))
 424                        return;
 425
 426                if (!(host->no_dma || (host->cmd_flags & FIFO_READY)))
 427                        return;
 428
 429                if (cmd->data->flags & MMC_DATA_WRITE) {
 430                        if (host->req->stop) {
 431                                if (!(host->cmd_flags & SCMD_ACTIVE)) {
 432                                        host->cmd_flags |= SCMD_ACTIVE;
 433                                        writel(TIFM_MMCSD_EOFB
 434                                               | readl(sock->addr
 435                                                       + SOCK_MMCSD_INT_ENABLE),
 436                                               sock->addr
 437                                               + SOCK_MMCSD_INT_ENABLE);
 438                                        tifm_sd_exec(host, host->req->stop);
 439                                        return;
 440                                } else {
 441                                        if (!(host->cmd_flags & SCMD_READY)
 442                                            || (host->cmd_flags & CARD_BUSY))
 443                                                return;
 444                                        writel((~TIFM_MMCSD_EOFB)
 445                                               & readl(sock->addr
 446                                                       + SOCK_MMCSD_INT_ENABLE),
 447                                               sock->addr
 448                                               + SOCK_MMCSD_INT_ENABLE);
 449                                }
 450                        } else {
 451                                if (host->cmd_flags & CARD_BUSY)
 452                                        return;
 453                                writel((~TIFM_MMCSD_EOFB)
 454                                       & readl(sock->addr
 455                                               + SOCK_MMCSD_INT_ENABLE),
 456                                       sock->addr + SOCK_MMCSD_INT_ENABLE);
 457                        }
 458                } else {
 459                        if (host->req->stop) {
 460                                if (!(host->cmd_flags & SCMD_ACTIVE)) {
 461                                        host->cmd_flags |= SCMD_ACTIVE;
 462                                        tifm_sd_exec(host, host->req->stop);
 463                                        return;
 464                                } else {
 465                                        if (!(host->cmd_flags & SCMD_READY))
 466                                                return;
 467                                }
 468                        }
 469                }
 470        }
 471finish_request:
 472        tasklet_schedule(&host->finish_tasklet);
 473}
 474
 475/* Called from interrupt handler */
 476static void tifm_sd_data_event(struct tifm_dev *sock)
 477{
 478        struct tifm_sd *host;
 479        unsigned int fifo_status = 0;
 480        struct mmc_data *r_data = NULL;
 481
 482        spin_lock(&sock->lock);
 483        host = mmc_priv((struct mmc_host*)tifm_get_drvdata(sock));
 484        fifo_status = readl(sock->addr + SOCK_DMA_FIFO_STATUS);
 485        dev_dbg(&sock->dev, "data event: fifo_status %x, flags %x\n",
 486                fifo_status, host->cmd_flags);
 487
 488        if (host->req) {
 489                r_data = host->req->cmd->data;
 490
 491                if (r_data && (fifo_status & TIFM_FIFO_READY)) {
 492                        if (tifm_sd_set_dma_data(host, r_data)) {
 493                                host->cmd_flags |= FIFO_READY;
 494                                tifm_sd_check_status(host);
 495                        }
 496                }
 497        }
 498
 499        writel(fifo_status, sock->addr + SOCK_DMA_FIFO_STATUS);
 500        spin_unlock(&sock->lock);
 501}
 502
 503/* Called from interrupt handler */
 504static void tifm_sd_card_event(struct tifm_dev *sock)
 505{
 506        struct tifm_sd *host;
 507        unsigned int host_status = 0;
 508        int cmd_error = 0;
 509        struct mmc_command *cmd = NULL;
 510        unsigned long flags;
 511
 512        spin_lock(&sock->lock);
 513        host = mmc_priv((struct mmc_host*)tifm_get_drvdata(sock));
 514        host_status = readl(sock->addr + SOCK_MMCSD_STATUS);
 515        dev_dbg(&sock->dev, "host event: host_status %x, flags %x\n",
 516                host_status, host->cmd_flags);
 517
 518        if (host->req) {
 519                cmd = host->req->cmd;
 520
 521                if (host_status & TIFM_MMCSD_ERRMASK) {
 522                        writel(host_status & TIFM_MMCSD_ERRMASK,
 523                               sock->addr + SOCK_MMCSD_STATUS);
 524                        if (host_status & TIFM_MMCSD_CTO)
 525                                cmd_error = -ETIMEDOUT;
 526                        else if (host_status & TIFM_MMCSD_CCRC)
 527                                cmd_error = -EILSEQ;
 528
 529                        if (cmd->data) {
 530                                if (host_status & TIFM_MMCSD_DTO)
 531                                        cmd->data->error = -ETIMEDOUT;
 532                                else if (host_status & TIFM_MMCSD_DCRC)
 533                                        cmd->data->error = -EILSEQ;
 534                        }
 535
 536                        writel(TIFM_FIFO_INT_SETALL,
 537                               sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
 538                        writel(TIFM_DMA_RESET, sock->addr + SOCK_DMA_CONTROL);
 539
 540                        if (host->req->stop) {
 541                                if (host->cmd_flags & SCMD_ACTIVE) {
 542                                        host->req->stop->error = cmd_error;
 543                                        host->cmd_flags |= SCMD_READY;
 544                                } else {
 545                                        cmd->error = cmd_error;
 546                                        host->cmd_flags |= SCMD_ACTIVE;
 547                                        tifm_sd_exec(host, host->req->stop);
 548                                        goto done;
 549                                }
 550                        } else
 551                                cmd->error = cmd_error;
 552                } else {
 553                        if (host_status & (TIFM_MMCSD_EOC | TIFM_MMCSD_CERR)) {
 554                                if (!(host->cmd_flags & CMD_READY)) {
 555                                        host->cmd_flags |= CMD_READY;
 556                                        tifm_sd_fetch_resp(cmd, sock);
 557                                } else if (host->cmd_flags & SCMD_ACTIVE) {
 558                                        host->cmd_flags |= SCMD_READY;
 559                                        tifm_sd_fetch_resp(host->req->stop,
 560                                                           sock);
 561                                }
 562                        }
 563                        if (host_status & TIFM_MMCSD_BRS)
 564                                host->cmd_flags |= BRS_READY;
 565                }
 566
 567                if (host->no_dma && cmd->data) {
 568                        if (host_status & TIFM_MMCSD_AE)
 569                                writel(host_status & TIFM_MMCSD_AE,
 570                                       sock->addr + SOCK_MMCSD_STATUS);
 571
 572                        if (host_status & (TIFM_MMCSD_AE | TIFM_MMCSD_AF
 573                                           | TIFM_MMCSD_BRS)) {
 574                                local_irq_save(flags);
 575                                tifm_sd_transfer_data(host);
 576                                local_irq_restore(flags);
 577                                host_status &= ~TIFM_MMCSD_AE;
 578                        }
 579                }
 580
 581                if (host_status & TIFM_MMCSD_EOFB)
 582                        host->cmd_flags &= ~CARD_BUSY;
 583                else if (host_status & TIFM_MMCSD_CB)
 584                        host->cmd_flags |= CARD_BUSY;
 585
 586                tifm_sd_check_status(host);
 587        }
 588done:
 589        writel(host_status, sock->addr + SOCK_MMCSD_STATUS);
 590        spin_unlock(&sock->lock);
 591}
 592
 593static void tifm_sd_set_data_timeout(struct tifm_sd *host,
 594                                     struct mmc_data *data)
 595{
 596        struct tifm_dev *sock = host->dev;
 597        unsigned int data_timeout = data->timeout_clks;
 598
 599        if (fixed_timeout)
 600                return;
 601
 602        data_timeout += data->timeout_ns /
 603                        ((1000000000UL / host->clk_freq) * host->clk_div);
 604
 605        if (data_timeout < 0xffff) {
 606                writel(data_timeout, sock->addr + SOCK_MMCSD_DATA_TO);
 607                writel((~TIFM_MMCSD_DPE)
 608                       & readl(sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG),
 609                       sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG);
 610        } else {
 611                data_timeout = (data_timeout >> 10) + 1;
 612                if (data_timeout > 0xffff)
 613                        data_timeout = 0;       /* set to unlimited */
 614                writel(data_timeout, sock->addr + SOCK_MMCSD_DATA_TO);
 615                writel(TIFM_MMCSD_DPE
 616                       | readl(sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG),
 617                       sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG);
 618        }
 619}
 620
 621static void tifm_sd_request(struct mmc_host *mmc, struct mmc_request *mrq)
 622{
 623        struct tifm_sd *host = mmc_priv(mmc);
 624        struct tifm_dev *sock = host->dev;
 625        unsigned long flags;
 626        struct mmc_data *r_data = mrq->cmd->data;
 627
 628        spin_lock_irqsave(&sock->lock, flags);
 629        if (host->eject) {
 630                mrq->cmd->error = -ENOMEDIUM;
 631                goto err_out;
 632        }
 633
 634        if (host->req) {
 635                pr_err("%s : unfinished request detected\n",
 636                       dev_name(&sock->dev));
 637                mrq->cmd->error = -ETIMEDOUT;
 638                goto err_out;
 639        }
 640
 641        host->cmd_flags = 0;
 642        host->block_pos = 0;
 643        host->sg_pos = 0;
 644
 645        if (mrq->data && !is_power_of_2(mrq->data->blksz))
 646                host->no_dma = 1;
 647        else
 648                host->no_dma = no_dma ? 1 : 0;
 649
 650        if (r_data) {
 651                tifm_sd_set_data_timeout(host, r_data);
 652
 653                if ((r_data->flags & MMC_DATA_WRITE) && !mrq->stop)
 654                         writel(TIFM_MMCSD_EOFB
 655                                | readl(sock->addr + SOCK_MMCSD_INT_ENABLE),
 656                                sock->addr + SOCK_MMCSD_INT_ENABLE);
 657
 658                if (host->no_dma) {
 659                        writel(TIFM_MMCSD_BUFINT
 660                               | readl(sock->addr + SOCK_MMCSD_INT_ENABLE),
 661                               sock->addr + SOCK_MMCSD_INT_ENABLE);
 662                        writel(((TIFM_MMCSD_FIFO_SIZE - 1) << 8)
 663                               | (TIFM_MMCSD_FIFO_SIZE - 1),
 664                               sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
 665
 666                        host->sg_len = r_data->sg_len;
 667                } else {
 668                        sg_init_one(&host->bounce_buf, host->bounce_buf_data,
 669                                    r_data->blksz);
 670
 671                        if(1 != tifm_map_sg(sock, &host->bounce_buf, 1,
 672                                            r_data->flags & MMC_DATA_WRITE
 673                                            ? PCI_DMA_TODEVICE
 674                                            : PCI_DMA_FROMDEVICE)) {
 675                                pr_err("%s : scatterlist map failed\n",
 676                                       dev_name(&sock->dev));
 677                                mrq->cmd->error = -ENOMEM;
 678                                goto err_out;
 679                        }
 680                        host->sg_len = tifm_map_sg(sock, r_data->sg,
 681                                                   r_data->sg_len,
 682                                                   r_data->flags
 683                                                   & MMC_DATA_WRITE
 684                                                   ? PCI_DMA_TODEVICE
 685                                                   : PCI_DMA_FROMDEVICE);
 686                        if (host->sg_len < 1) {
 687                                pr_err("%s : scatterlist map failed\n",
 688                                       dev_name(&sock->dev));
 689                                tifm_unmap_sg(sock, &host->bounce_buf, 1,
 690                                              r_data->flags & MMC_DATA_WRITE
 691                                              ? PCI_DMA_TODEVICE
 692                                              : PCI_DMA_FROMDEVICE);
 693                                mrq->cmd->error = -ENOMEM;
 694                                goto err_out;
 695                        }
 696
 697                        writel(TIFM_FIFO_INT_SETALL,
 698                               sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
 699                        writel(ilog2(r_data->blksz) - 2,
 700                               sock->addr + SOCK_FIFO_PAGE_SIZE);
 701                        writel(TIFM_FIFO_ENABLE,
 702                               sock->addr + SOCK_FIFO_CONTROL);
 703                        writel(TIFM_FIFO_INTMASK,
 704                               sock->addr + SOCK_DMA_FIFO_INT_ENABLE_SET);
 705
 706                        if (r_data->flags & MMC_DATA_WRITE)
 707                                writel(TIFM_MMCSD_TXDE,
 708                                       sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
 709                        else
 710                                writel(TIFM_MMCSD_RXDE,
 711                                       sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
 712
 713                        tifm_sd_set_dma_data(host, r_data);
 714                }
 715
 716                writel(r_data->blocks - 1,
 717                       sock->addr + SOCK_MMCSD_NUM_BLOCKS);
 718                writel(r_data->blksz - 1,
 719                       sock->addr + SOCK_MMCSD_BLOCK_LEN);
 720        }
 721
 722        host->req = mrq;
 723        mod_timer(&host->timer, jiffies + host->timeout_jiffies);
 724        writel(TIFM_CTRL_LED | readl(sock->addr + SOCK_CONTROL),
 725               sock->addr + SOCK_CONTROL);
 726        tifm_sd_exec(host, mrq->cmd);
 727        spin_unlock_irqrestore(&sock->lock, flags);
 728        return;
 729
 730err_out:
 731        spin_unlock_irqrestore(&sock->lock, flags);
 732        mmc_request_done(mmc, mrq);
 733}
 734
 735static void tifm_sd_end_cmd(unsigned long data)
 736{
 737        struct tifm_sd *host = (struct tifm_sd*)data;
 738        struct tifm_dev *sock = host->dev;
 739        struct mmc_host *mmc = tifm_get_drvdata(sock);
 740        struct mmc_request *mrq;
 741        struct mmc_data *r_data = NULL;
 742        unsigned long flags;
 743
 744        spin_lock_irqsave(&sock->lock, flags);
 745
 746        del_timer(&host->timer);
 747        mrq = host->req;
 748        host->req = NULL;
 749
 750        if (!mrq) {
 751                pr_err(" %s : no request to complete?\n",
 752                       dev_name(&sock->dev));
 753                spin_unlock_irqrestore(&sock->lock, flags);
 754                return;
 755        }
 756
 757        r_data = mrq->cmd->data;
 758        if (r_data) {
 759                if (host->no_dma) {
 760                        writel((~TIFM_MMCSD_BUFINT)
 761                               & readl(sock->addr + SOCK_MMCSD_INT_ENABLE),
 762                               sock->addr + SOCK_MMCSD_INT_ENABLE);
 763                } else {
 764                        tifm_unmap_sg(sock, &host->bounce_buf, 1,
 765                                      (r_data->flags & MMC_DATA_WRITE)
 766                                      ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
 767                        tifm_unmap_sg(sock, r_data->sg, r_data->sg_len,
 768                                      (r_data->flags & MMC_DATA_WRITE)
 769                                      ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
 770                }
 771
 772                r_data->bytes_xfered = r_data->blocks
 773                        - readl(sock->addr + SOCK_MMCSD_NUM_BLOCKS) - 1;
 774                r_data->bytes_xfered *= r_data->blksz;
 775                r_data->bytes_xfered += r_data->blksz
 776                        - readl(sock->addr + SOCK_MMCSD_BLOCK_LEN) + 1;
 777        }
 778
 779        writel((~TIFM_CTRL_LED) & readl(sock->addr + SOCK_CONTROL),
 780               sock->addr + SOCK_CONTROL);
 781
 782        spin_unlock_irqrestore(&sock->lock, flags);
 783        mmc_request_done(mmc, mrq);
 784}
 785
 786static void tifm_sd_abort(unsigned long data)
 787{
 788        struct tifm_sd *host = (struct tifm_sd*)data;
 789
 790        pr_err("%s : card failed to respond for a long period of time "
 791               "(%x, %x)\n",
 792               dev_name(&host->dev->dev), host->req->cmd->opcode, host->cmd_flags);
 793
 794        tifm_eject(host->dev);
 795}
 796
 797static void tifm_sd_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 798{
 799        struct tifm_sd *host = mmc_priv(mmc);
 800        struct tifm_dev *sock = host->dev;
 801        unsigned int clk_div1, clk_div2;
 802        unsigned long flags;
 803
 804        spin_lock_irqsave(&sock->lock, flags);
 805
 806        dev_dbg(&sock->dev, "ios: clock = %u, vdd = %x, bus_mode = %x, "
 807                "chip_select = %x, power_mode = %x, bus_width = %x\n",
 808                ios->clock, ios->vdd, ios->bus_mode, ios->chip_select,
 809                ios->power_mode, ios->bus_width);
 810
 811        if (ios->bus_width == MMC_BUS_WIDTH_4) {
 812                writel(TIFM_MMCSD_4BBUS | readl(sock->addr + SOCK_MMCSD_CONFIG),
 813                       sock->addr + SOCK_MMCSD_CONFIG);
 814        } else {
 815                writel((~TIFM_MMCSD_4BBUS)
 816                       & readl(sock->addr + SOCK_MMCSD_CONFIG),
 817                       sock->addr + SOCK_MMCSD_CONFIG);
 818        }
 819
 820        if (ios->clock) {
 821                clk_div1 = 20000000 / ios->clock;
 822                if (!clk_div1)
 823                        clk_div1 = 1;
 824
 825                clk_div2 = 24000000 / ios->clock;
 826                if (!clk_div2)
 827                        clk_div2 = 1;
 828
 829                if ((20000000 / clk_div1) > ios->clock)
 830                        clk_div1++;
 831                if ((24000000 / clk_div2) > ios->clock)
 832                        clk_div2++;
 833                if ((20000000 / clk_div1) > (24000000 / clk_div2)) {
 834                        host->clk_freq = 20000000;
 835                        host->clk_div = clk_div1;
 836                        writel((~TIFM_CTRL_FAST_CLK)
 837                               & readl(sock->addr + SOCK_CONTROL),
 838                               sock->addr + SOCK_CONTROL);
 839                } else {
 840                        host->clk_freq = 24000000;
 841                        host->clk_div = clk_div2;
 842                        writel(TIFM_CTRL_FAST_CLK
 843                               | readl(sock->addr + SOCK_CONTROL),
 844                               sock->addr + SOCK_CONTROL);
 845                }
 846        } else {
 847                host->clk_div = 0;
 848        }
 849        host->clk_div &= TIFM_MMCSD_CLKMASK;
 850        writel(host->clk_div
 851               | ((~TIFM_MMCSD_CLKMASK)
 852                  & readl(sock->addr + SOCK_MMCSD_CONFIG)),
 853               sock->addr + SOCK_MMCSD_CONFIG);
 854
 855        host->open_drain = (ios->bus_mode == MMC_BUSMODE_OPENDRAIN);
 856
 857        /* chip_select : maybe later */
 858        //vdd
 859        //power is set before probe / after remove
 860
 861        spin_unlock_irqrestore(&sock->lock, flags);
 862}
 863
 864static int tifm_sd_ro(struct mmc_host *mmc)
 865{
 866        int rc = 0;
 867        struct tifm_sd *host = mmc_priv(mmc);
 868        struct tifm_dev *sock = host->dev;
 869        unsigned long flags;
 870
 871        spin_lock_irqsave(&sock->lock, flags);
 872        if (TIFM_MMCSD_CARD_RO & readl(sock->addr + SOCK_PRESENT_STATE))
 873                rc = 1;
 874        spin_unlock_irqrestore(&sock->lock, flags);
 875        return rc;
 876}
 877
 878static const struct mmc_host_ops tifm_sd_ops = {
 879        .request = tifm_sd_request,
 880        .set_ios = tifm_sd_ios,
 881        .get_ro  = tifm_sd_ro
 882};
 883
 884static int tifm_sd_initialize_host(struct tifm_sd *host)
 885{
 886        int rc;
 887        unsigned int host_status = 0;
 888        struct tifm_dev *sock = host->dev;
 889
 890        writel(0, sock->addr + SOCK_MMCSD_INT_ENABLE);
 891        mmiowb();
 892        host->clk_div = 61;
 893        host->clk_freq = 20000000;
 894        writel(TIFM_MMCSD_RESET, sock->addr + SOCK_MMCSD_SYSTEM_CONTROL);
 895        writel(host->clk_div | TIFM_MMCSD_POWER,
 896               sock->addr + SOCK_MMCSD_CONFIG);
 897
 898        /* wait up to 0.51 sec for reset */
 899        for (rc = 32; rc <= 256; rc <<= 1) {
 900                if (1 & readl(sock->addr + SOCK_MMCSD_SYSTEM_STATUS)) {
 901                        rc = 0;
 902                        break;
 903                }
 904                msleep(rc);
 905        }
 906
 907        if (rc) {
 908                pr_err("%s : controller failed to reset\n",
 909                       dev_name(&sock->dev));
 910                return -ENODEV;
 911        }
 912
 913        writel(0, sock->addr + SOCK_MMCSD_NUM_BLOCKS);
 914        writel(host->clk_div | TIFM_MMCSD_POWER,
 915               sock->addr + SOCK_MMCSD_CONFIG);
 916        writel(TIFM_MMCSD_RXDE, sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
 917
 918        // command timeout fixed to 64 clocks for now
 919        writel(64, sock->addr + SOCK_MMCSD_COMMAND_TO);
 920        writel(TIFM_MMCSD_INAB, sock->addr + SOCK_MMCSD_COMMAND);
 921
 922        for (rc = 16; rc <= 64; rc <<= 1) {
 923                host_status = readl(sock->addr + SOCK_MMCSD_STATUS);
 924                writel(host_status, sock->addr + SOCK_MMCSD_STATUS);
 925                if (!(host_status & TIFM_MMCSD_ERRMASK)
 926                    && (host_status & TIFM_MMCSD_EOC)) {
 927                        rc = 0;
 928                        break;
 929                }
 930                msleep(rc);
 931        }
 932
 933        if (rc) {
 934                pr_err("%s : card not ready - probe failed on initialization\n",
 935                       dev_name(&sock->dev));
 936                return -ENODEV;
 937        }
 938
 939        writel(TIFM_MMCSD_CERR | TIFM_MMCSD_BRS | TIFM_MMCSD_EOC
 940               | TIFM_MMCSD_ERRMASK,
 941               sock->addr + SOCK_MMCSD_INT_ENABLE);
 942        mmiowb();
 943
 944        return 0;
 945}
 946
 947static int tifm_sd_probe(struct tifm_dev *sock)
 948{
 949        struct mmc_host *mmc;
 950        struct tifm_sd *host;
 951        int rc = -EIO;
 952
 953        if (!(TIFM_SOCK_STATE_OCCUPIED
 954              & readl(sock->addr + SOCK_PRESENT_STATE))) {
 955                pr_warn("%s : card gone, unexpectedly\n",
 956                        dev_name(&sock->dev));
 957                return rc;
 958        }
 959
 960        mmc = mmc_alloc_host(sizeof(struct tifm_sd), &sock->dev);
 961        if (!mmc)
 962                return -ENOMEM;
 963
 964        host = mmc_priv(mmc);
 965        tifm_set_drvdata(sock, mmc);
 966        host->dev = sock;
 967        host->timeout_jiffies = msecs_to_jiffies(1000);
 968
 969        tasklet_init(&host->finish_tasklet, tifm_sd_end_cmd,
 970                     (unsigned long)host);
 971        setup_timer(&host->timer, tifm_sd_abort, (unsigned long)host);
 972
 973        mmc->ops = &tifm_sd_ops;
 974        mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
 975        mmc->caps = MMC_CAP_4_BIT_DATA;
 976        mmc->f_min = 20000000 / 60;
 977        mmc->f_max = 24000000;
 978
 979        mmc->max_blk_count = 2048;
 980        mmc->max_segs = mmc->max_blk_count;
 981        mmc->max_blk_size = min(TIFM_MMCSD_MAX_BLOCK_SIZE, PAGE_SIZE);
 982        mmc->max_seg_size = mmc->max_blk_count * mmc->max_blk_size;
 983        mmc->max_req_size = mmc->max_seg_size;
 984
 985        sock->card_event = tifm_sd_card_event;
 986        sock->data_event = tifm_sd_data_event;
 987        rc = tifm_sd_initialize_host(host);
 988
 989        if (!rc)
 990                rc = mmc_add_host(mmc);
 991        if (!rc)
 992                return 0;
 993
 994        mmc_free_host(mmc);
 995        return rc;
 996}
 997
 998static void tifm_sd_remove(struct tifm_dev *sock)
 999{
1000        struct mmc_host *mmc = tifm_get_drvdata(sock);
1001        struct tifm_sd *host = mmc_priv(mmc);
1002        unsigned long flags;
1003
1004        spin_lock_irqsave(&sock->lock, flags);
1005        host->eject = 1;
1006        writel(0, sock->addr + SOCK_MMCSD_INT_ENABLE);
1007        mmiowb();
1008        spin_unlock_irqrestore(&sock->lock, flags);
1009
1010        tasklet_kill(&host->finish_tasklet);
1011
1012        spin_lock_irqsave(&sock->lock, flags);
1013        if (host->req) {
1014                writel(TIFM_FIFO_INT_SETALL,
1015                       sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
1016                writel(0, sock->addr + SOCK_DMA_FIFO_INT_ENABLE_SET);
1017                host->req->cmd->error = -ENOMEDIUM;
1018                if (host->req->stop)
1019                        host->req->stop->error = -ENOMEDIUM;
1020                tasklet_schedule(&host->finish_tasklet);
1021        }
1022        spin_unlock_irqrestore(&sock->lock, flags);
1023        mmc_remove_host(mmc);
1024        dev_dbg(&sock->dev, "after remove\n");
1025
1026        mmc_free_host(mmc);
1027}
1028
1029#ifdef CONFIG_PM
1030
1031static int tifm_sd_suspend(struct tifm_dev *sock, pm_message_t state)
1032{
1033        return 0;
1034}
1035
1036static int tifm_sd_resume(struct tifm_dev *sock)
1037{
1038        struct mmc_host *mmc = tifm_get_drvdata(sock);
1039        struct tifm_sd *host = mmc_priv(mmc);
1040        int rc;
1041
1042        rc = tifm_sd_initialize_host(host);
1043        dev_dbg(&sock->dev, "resume initialize %d\n", rc);
1044
1045        if (rc)
1046                host->eject = 1;
1047
1048        return rc;
1049}
1050
1051#else
1052
1053#define tifm_sd_suspend NULL
1054#define tifm_sd_resume NULL
1055
1056#endif /* CONFIG_PM */
1057
1058static struct tifm_device_id tifm_sd_id_tbl[] = {
1059        { TIFM_TYPE_SD }, { }
1060};
1061
1062static struct tifm_driver tifm_sd_driver = {
1063        .driver = {
1064                .name  = DRIVER_NAME,
1065                .owner = THIS_MODULE
1066        },
1067        .id_table = tifm_sd_id_tbl,
1068        .probe    = tifm_sd_probe,
1069        .remove   = tifm_sd_remove,
1070        .suspend  = tifm_sd_suspend,
1071        .resume   = tifm_sd_resume
1072};
1073
1074static int __init tifm_sd_init(void)
1075{
1076        return tifm_register_driver(&tifm_sd_driver);
1077}
1078
1079static void __exit tifm_sd_exit(void)
1080{
1081        tifm_unregister_driver(&tifm_sd_driver);
1082}
1083
1084MODULE_AUTHOR("Alex Dubov");
1085MODULE_DESCRIPTION("TI FlashMedia SD driver");
1086MODULE_LICENSE("GPL");
1087MODULE_DEVICE_TABLE(tifm, tifm_sd_id_tbl);
1088MODULE_VERSION(DRIVER_VERSION);
1089
1090module_init(tifm_sd_init);
1091module_exit(tifm_sd_exit);
1092