drivers/net/wireless/rsi/rsi_91x_sdio.c

   1 /**
   2  * Copyright (c) 2014 Redpine Signals Inc.
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  *
  16  */
  17
  18 #include <linux/module.h>
  19 #include "rsi_sdio.h"
  20 #include "rsi_common.h"
  21
  22 /**
  23  * rsi_sdio_set_cmd52_arg() - This function prepares cmd 52 read/write arg.
  24  * @rw: Read/write
  25  * @func: function number
  26  * @raw: indicates whether to perform read after write
  27  * @address: address to which to read/write
  28  * @writedata: data to write
  29  *
  30  * Return: argument
  31  */
  32 static u32 rsi_sdio_set_cmd52_arg(bool rw,
  33                                   u8 func,
  34                                   u8 raw,
  35                                   u32 address,
  36                                   u8 writedata)
  37 {
  38         return ((rw & 1) << 31) | ((func & 0x7) << 28) |
  39                 ((raw & 1) << 27) | (1 << 26) |
  40                 ((address & 0x1FFFF) << 9) | (1 << 8) |
  41                 (writedata & 0xFF);
  42 }
  43
  44 /**
  45  * rsi_cmd52writebyte() - This function issues cmd52 byte write onto the card.
  46  * @card: Pointer to the mmc_card.
  47  * @address: Address to write.
  48  * @byte: Data to write.
  49  *
  50  * Return: Write status.
  51  */
  52 static int rsi_cmd52writebyte(struct mmc_card *card,
  53                               u32 address,
  54                               u8 byte)
  55 {
  56         struct mmc_command io_cmd;
  57         u32 arg;
  58
  59         memset(&io_cmd, 0, sizeof(io_cmd));
  60         arg = rsi_sdio_set_cmd52_arg(1, 0, 0, address, byte);
  61         io_cmd.opcode = SD_IO_RW_DIRECT;
  62         io_cmd.arg = arg;
  63         io_cmd.flags = MMC_RSP_R5 | MMC_CMD_AC;
  64
  65         return mmc_wait_for_cmd(card->host, &io_cmd, 0);
  66 }
  67
  68 /**
  69  * rsi_cmd52readbyte() - This function issues cmd52 byte read onto the card.
  70  * @card: Pointer to the mmc_card.
  71  * @address: Address to read from.
  72  * @byte: Variable to store read value.
  73  *
  74  * Return: Read status.
  75  */
  76 static int rsi_cmd52readbyte(struct mmc_card *card,
  77                              u32 address,
  78                              u8 *byte)
  79 {
  80         struct mmc_command io_cmd;
  81         u32 arg;
  82         int err;
  83
  84         memset(&io_cmd, 0, sizeof(io_cmd));
  85         arg = rsi_sdio_set_cmd52_arg(0, 0, 0, address, 0);
  86         io_cmd.opcode = SD_IO_RW_DIRECT;
  87         io_cmd.arg = arg;
  88         io_cmd.flags = MMC_RSP_R5 | MMC_CMD_AC;
  89
  90         err = mmc_wait_for_cmd(card->host, &io_cmd, 0);
  91         if ((!err) && (byte))
  92                 *byte =  io_cmd.resp[0] & 0xFF;
  93         return err;
  94 }
  95
  96 /**
  97  * rsi_issue_sdiocommand() - This function issues sdio commands.
  98  * @func: Pointer to the sdio_func structure.
  99  * @opcode: Opcode value.
 100  * @arg: Arguments to pass.
 101  * @flags: Flags which are set.
 102  * @resp: Pointer to store response.
 103  *
 104  * Return: err: command status as 0 or -1.
 105  */
 106 static int rsi_issue_sdiocommand(struct sdio_func *func,
 107                                  u32 opcode,
 108                                  u32 arg,
 109                                  u32 flags,
 110                                  u32 *resp)
 111 {
 112         struct mmc_command cmd;
 113         struct mmc_host *host;
 114         int err;
 115
 116         host = func->card->host;
 117
 118         memset(&cmd, 0, sizeof(struct mmc_command));
 119         cmd.opcode = opcode;
 120         cmd.arg = arg;
 121         cmd.flags = flags;
 122         err = mmc_wait_for_cmd(host, &cmd, 3);
 123
 124         if ((!err) && (resp))
 125                 *resp = cmd.resp[0];
 126
 127         return err;
 128 }
 129
 130 /**
 131  * rsi_handle_interrupt() - This function is called upon the occurence
 132  *                          of an interrupt.
 133  * @function: Pointer to the sdio_func structure.
 134  *
 135  * Return: None.
 136  */
 137 static void rsi_handle_interrupt(struct sdio_func *function)
 138 {
 139         struct rsi_hw *adapter = sdio_get_drvdata(function);
 140
 141         sdio_release_host(function);
 142         rsi_interrupt_handler(adapter);
 143         sdio_claim_host(function);
 144 }
 145
 146 /**
 147  * rsi_reset_card() - This function resets and re-initializes the card.
 148  * @pfunction: Pointer to the sdio_func structure.
 149  *
 150  * Return: None.
 151  */
 152 static void rsi_reset_card(struct sdio_func *pfunction)
 153 {
 154         int ret = 0;
 155         int err;
 156         struct mmc_card *card = pfunction->card;
 157         struct mmc_host *host = card->host;
 158         s32 bit = (fls(host->ocr_avail) - 1);
 159         u8 cmd52_resp;
 160         u32 clock, resp, i;
 161         u16 rca;
 162
 163         /* Reset 9110 chip */
 164         ret = rsi_cmd52writebyte(pfunction->card,
 165                                  SDIO_CCCR_ABORT,
 166                                  (1 << 3));
 167
 168         /* Card will not send any response as it is getting reset immediately
 169          * Hence expect a timeout status from host controller
 170          */
 171         if (ret != -ETIMEDOUT)
 172                 rsi_dbg(ERR_ZONE, "%s: Reset failed : %d\n", __func__, ret);
 173
 174         /* Wait for few milli seconds to get rid of residue charges if any */
 175         msleep(20);
 176
 177         /* Initialize the SDIO card */
 178         host->ios.vdd = bit;
 179         host->ios.chip_select = MMC_CS_DONTCARE;
 180         host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
 181         host->ios.power_mode = MMC_POWER_UP;
 182         host->ios.bus_width = MMC_BUS_WIDTH_1;
 183         host->ios.timing = MMC_TIMING_LEGACY;
 184         host->ops->set_ios(host, &host->ios);
 185
 186         /*
 187          * This delay should be sufficient to allow the power supply
 188          * to reach the minimum voltage.
 189          */
 190         msleep(20);
 191
 192         host->ios.clock = host->f_min;
 193         host->ios.power_mode = MMC_POWER_ON;
 194         host->ops->set_ios(host, &host->ios);
 195
 196         /*
 197          * This delay must be at least 74 clock sizes, or 1 ms, or the
 198          * time required to reach a stable voltage.
 199          */
 200         msleep(20);
 201
 202         /* Issue CMD0. Goto idle state */
 203         host->ios.chip_select = MMC_CS_HIGH;
 204         host->ops->set_ios(host, &host->ios);
 205         msleep(20);
 206         err = rsi_issue_sdiocommand(pfunction,
 207                                     MMC_GO_IDLE_STATE,
 208                                     0,
 209                                     (MMC_RSP_NONE | MMC_CMD_BC),
 210                                     NULL);
 211         host->ios.chip_select = MMC_CS_DONTCARE;
 212         host->ops->set_ios(host, &host->ios);
 213         msleep(20);
 214         host->use_spi_crc = 0;
 215
 216         if (err)
 217                 rsi_dbg(ERR_ZONE, "%s: CMD0 failed : %d\n", __func__, err);
 218
 219         if (!host->ocr_avail) {
 220                 /* Issue CMD5, arg = 0 */
 221                 err = rsi_issue_sdiocommand(pfunction,
 222                                             SD_IO_SEND_OP_COND,
 223                                             0,
 224                                             (MMC_RSP_R4 | MMC_CMD_BCR),
 225                                             &resp);
 226                 if (err)
 227                         rsi_dbg(ERR_ZONE, "%s: CMD5 failed : %d\n",
 228                                 __func__, err);
 229                 host->ocr_avail = resp;
 230         }
 231
 232         /* Issue CMD5, arg = ocr. Wait till card is ready  */
 233         for (i = 0; i < 100; i++) {
 234                 err = rsi_issue_sdiocommand(pfunction,
 235                                             SD_IO_SEND_OP_COND,
 236                                             host->ocr_avail,
 237                                             (MMC_RSP_R4 | MMC_CMD_BCR),
 238                                             &resp);
 239                 if (err) {
 240                         rsi_dbg(ERR_ZONE, "%s: CMD5 failed : %d\n",
 241                                 __func__, err);
 242                         break;
 243                 }
 244
 245                 if (resp & MMC_CARD_BUSY)
 246                         break;
 247                 msleep(20);
 248         }
 249
 250         if ((i == 100) || (err)) {
 251                 rsi_dbg(ERR_ZONE, "%s: card in not ready : %d %d\n",
 252                         __func__, i, err);
 253                 return;
 254         }
 255
 256         /* Issue CMD3, get RCA */
 257         err = rsi_issue_sdiocommand(pfunction,
 258                                     SD_SEND_RELATIVE_ADDR,
 259                                     0,
 260                                     (MMC_RSP_R6 | MMC_CMD_BCR),
 261                                     &resp);
 262         if (err) {
 263                 rsi_dbg(ERR_ZONE, "%s: CMD3 failed : %d\n", __func__, err);
 264                 return;
 265         }
 266         rca = resp >> 16;
 267         host->ios.bus_mode = MMC_BUSMODE_PUSHPULL;
 268         host->ops->set_ios(host, &host->ios);
 269
 270         /* Issue CMD7, select card  */
 271         err = rsi_issue_sdiocommand(pfunction,
 272                                     MMC_SELECT_CARD,
 273                                     (rca << 16),
 274                                     (MMC_RSP_R1 | MMC_CMD_AC),
 275                                     NULL);
 276         if (err) {
 277                 rsi_dbg(ERR_ZONE, "%s: CMD7 failed : %d\n", __func__, err);
 278                 return;
 279         }
 280
 281         /* Enable high speed */
 282         if (card->host->caps & MMC_CAP_SD_HIGHSPEED) {
 283                 rsi_dbg(ERR_ZONE, "%s: Set high speed mode\n", __func__);
 284                 err = rsi_cmd52readbyte(card, SDIO_CCCR_SPEED, &cmd52_resp);
 285                 if (err) {
 286                         rsi_dbg(ERR_ZONE, "%s: CCCR speed reg read failed: %d\n",
 287                                 __func__, err);
 288                         card->state &= ~MMC_STATE_HIGHSPEED;
 289                 } else {
 290                         err = rsi_cmd52writebyte(card,
 291                                                  SDIO_CCCR_SPEED,
 292                                                  (cmd52_resp | SDIO_SPEED_EHS));
 293                         if (err) {
 294                                 rsi_dbg(ERR_ZONE,
 295                                         "%s: CCR speed regwrite failed %d\n",
 296                                         __func__, err);
 297                                 return;
 298                         }
 299                         mmc_card_set_highspeed(card);
 300                         host->ios.timing = MMC_TIMING_SD_HS;
 301                         host->ops->set_ios(host, &host->ios);
 302                 }
 303         }
 304
 305         /* Set clock */
 306         if (mmc_card_highspeed(card))
 307                 clock = 50000000;
 308         else
 309                 clock = card->cis.max_dtr;
 310
 311         if (clock > host->f_max)
 312                 clock = host->f_max;
 313
 314         host->ios.clock = clock;
 315         host->ops->set_ios(host, &host->ios);
 316
 317         if (card->host->caps & MMC_CAP_4_BIT_DATA) {
 318                 /* CMD52: Set bus width & disable card detect resistor */
 319                 err = rsi_cmd52writebyte(card,
 320                                          SDIO_CCCR_IF,
 321                                          (SDIO_BUS_CD_DISABLE |
 322                                           SDIO_BUS_WIDTH_4BIT));
 323                 if (err) {
 324                         rsi_dbg(ERR_ZONE, "%s: Set bus mode failed : %d\n",
 325                                 __func__, err);
 326                         return;
 327                 }
 328                 host->ios.bus_width = MMC_BUS_WIDTH_4;
 329                 host->ops->set_ios(host, &host->ios);
 330         }
 331 }
 332
 333 /**
 334  * rsi_setclock() - This function sets the clock frequency.
 335  * @adapter: Pointer to the adapter structure.
 336  * @freq: Clock frequency.
 337  *
 338  * Return: None.
 339  */
 340 static void rsi_setclock(struct rsi_hw *adapter, u32 freq)
 341 {
 342         struct rsi_91x_sdiodev *dev =
 343                 (struct rsi_91x_sdiodev *)adapter->rsi_dev;
 344         struct mmc_host *host = dev->pfunction->card->host;
 345         u32 clock;
 346
 347         clock = freq * 1000;
 348         if (clock > host->f_max)
 349                 clock = host->f_max;
 350         host->ios.clock = clock;
 351         host->ops->set_ios(host, &host->ios);
 352 }
 353
 354 /**
 355  * rsi_setblocklength() - This function sets the host block length.
 356  * @adapter: Pointer to the adapter structure.
 357  * @length: Block length to be set.
 358  *
 359  * Return: status: 0 on success, -1 on failure.
 360  */
 361 static int rsi_setblocklength(struct rsi_hw *adapter, u32 length)
 362 {
 363         struct rsi_91x_sdiodev *dev =
 364                 (struct rsi_91x_sdiodev *)adapter->rsi_dev;
 365         int status;
 366         rsi_dbg(INIT_ZONE, "%s: Setting the block length\n", __func__);
 367
 368         status = sdio_set_block_size(dev->pfunction, length);
 369         dev->pfunction->max_blksize = 256;
 370
 371         rsi_dbg(INFO_ZONE,
 372                 "%s: Operational blk length is %d\n", __func__, length);
 373         return status;
 374 }
 375
 376 /**
 377  * rsi_setupcard() - This function queries and sets the card's features.
 378  * @adapter: Pointer to the adapter structure.
 379  *
 380  * Return: status: 0 on success, -1 on failure.
 381  */
 382 static int rsi_setupcard(struct rsi_hw *adapter)
 383 {
 384         struct rsi_91x_sdiodev *dev =
 385                 (struct rsi_91x_sdiodev *)adapter->rsi_dev;
 386         int status = 0;
 387
 388         rsi_setclock(adapter, 50000);
 389
 390         dev->tx_blk_size = 256;
 391         status = rsi_setblocklength(adapter, dev->tx_blk_size);
 392         if (status)
 393                 rsi_dbg(ERR_ZONE,
 394                         "%s: Unable to set block length\n", __func__);
 395         return status;
 396 }
 397
 398 /**
 399  * rsi_sdio_read_register() - This function reads one byte of information
 400  *                            from a register.
 401  * @adapter: Pointer to the adapter structure.
 402  * @addr: Address of the register.
 403  * @data: Pointer to the data that stores the data read.
 404  *
 405  * Return: 0 on success, -1 on failure.
 406  */
 407 int rsi_sdio_read_register(struct rsi_hw *adapter,
 408                            u32 addr,
 409                            u8 *data)
 410 {
 411         struct rsi_91x_sdiodev *dev =
 412                 (struct rsi_91x_sdiodev *)adapter->rsi_dev;
 413         u8 fun_num = 0;
 414         int status;
 415
 416         sdio_claim_host(dev->pfunction);
 417
 418         if (fun_num == 0)
 419                 *data = sdio_f0_readb(dev->pfunction, addr, &status);
 420         else
 421                 *data = sdio_readb(dev->pfunction, addr, &status);
 422
 423         sdio_release_host(dev->pfunction);
 424
 425         return status;
 426 }
 427
 428 /**
 429  * rsi_sdio_write_register() - This function writes one byte of information
 430  *                             into a register.
 431  * @adapter: Pointer to the adapter structure.
 432  * @function: Function Number.
 433  * @addr: Address of the register.
 434  * @data: Pointer to the data tha has to be written.
 435  *
 436  * Return: 0 on success, -1 on failure.
 437  */
 438 int rsi_sdio_write_register(struct rsi_hw *adapter,
 439                             u8 function,
 440                             u32 addr,
 441                             u8 *data)
 442 {
 443         struct rsi_91x_sdiodev *dev =
 444                 (struct rsi_91x_sdiodev *)adapter->rsi_dev;
 445         int status = 0;
 446
 447         sdio_claim_host(dev->pfunction);
 448
 449         if (function == 0)
 450                 sdio_f0_writeb(dev->pfunction, *data, addr, &status);
 451         else
 452                 sdio_writeb(dev->pfunction, *data, addr, &status);
 453
 454         sdio_release_host(dev->pfunction);
 455
 456         return status;
 457 }
 458
 459 /**
 460  * rsi_sdio_ack_intr() - This function acks the interrupt received.
 461  * @adapter: Pointer to the adapter structure.
 462  * @int_bit: Interrupt bit to write into register.
 463  *
 464  * Return: None.
 465  */
 466 void rsi_sdio_ack_intr(struct rsi_hw *adapter, u8 int_bit)
 467 {
 468         int status;
 469         status = rsi_sdio_write_register(adapter,
 470                                          1,
 471                                          (SDIO_FUN1_INTR_CLR_REG |
 472                                           RSI_SD_REQUEST_MASTER),
 473                                          &int_bit);
 474         if (status)
 475                 rsi_dbg(ERR_ZONE, "%s: unable to send ack\n", __func__);
 476 }
 477
 478
 479
 480 /**
 481  * rsi_sdio_read_register_multiple() - This function read multiple bytes of
 482  *                                     information from the SD card.
 483  * @adapter: Pointer to the adapter structure.
 484  * @addr: Address of the register.
 485  * @count: Number of multiple bytes to be read.
 486  * @data: Pointer to the read data.
 487  *
 488  * Return: 0 on success, -1 on failure.
 489  */
 490 static int rsi_sdio_read_register_multiple(struct rsi_hw *adapter,
 491                                            u32 addr,
 492                                            u32 count,
 493                                            u8 *data)
 494 {
 495         struct rsi_91x_sdiodev *dev =
 496                 (struct rsi_91x_sdiodev *)adapter->rsi_dev;
 497         u32 status;
 498
 499         sdio_claim_host(dev->pfunction);
 500
 501         status =  sdio_readsb(dev->pfunction, data, addr, count);
 502
 503         sdio_release_host(dev->pfunction);
 504
 505         if (status != 0)
 506                 rsi_dbg(ERR_ZONE, "%s: Synch Cmd53 read failed\n", __func__);
 507         return status;
 508 }
 509
 510 /**
 511  * rsi_sdio_write_register_multiple() - This function writes multiple bytes of
 512  *                                      information to the SD card.
 513  * @adapter: Pointer to the adapter structure.
 514  * @addr: Address of the register.
 515  * @data: Pointer to the data that has to be written.
 516  * @count: Number of multiple bytes to be written.
 517  *
 518  * Return: 0 on success, -1 on failure.
 519  */
 520 int rsi_sdio_write_register_multiple(struct rsi_hw *adapter,
 521                                      u32 addr,
 522                                      u8 *data,
 523                                      u32 count)
 524 {
 525         struct rsi_91x_sdiodev *dev =
 526                 (struct rsi_91x_sdiodev *)adapter->rsi_dev;
 527         int status;
 528
 529         if (dev->write_fail > 1) {
 530                 rsi_dbg(ERR_ZONE, "%s: Stopping card writes\n", __func__);
 531                 return 0;
 532         } else if (dev->write_fail == 1) {
 533                 /**
 534                  * Assuming it is a CRC failure, we want to allow another
 535                  *  card write
 536                  */
 537                 rsi_dbg(ERR_ZONE, "%s: Continue card writes\n", __func__);
 538                 dev->write_fail++;
 539         }
 540
 541         sdio_claim_host(dev->pfunction);
 542
 543         status = sdio_writesb(dev->pfunction, addr, data, count);
 544
 545         sdio_release_host(dev->pfunction);
 546
 547         if (status) {
 548                 rsi_dbg(ERR_ZONE, "%s: Synch Cmd53 write failed %d\n",
 549                         __func__, status);
 550                 dev->write_fail = 2;
 551         } else {
 552                 memcpy(dev->prev_desc, data, FRAME_DESC_SZ);
 553         }
 554         return status;
 555 }
 556
 557 /**
 558  * rsi_sdio_host_intf_write_pkt() - This function writes the packet to device.
 559  * @adapter: Pointer to the adapter structure.
 560  * @pkt: Pointer to the data to be written on to the device.
 561  * @len: length of the data to be written on to the device.
 562  *
 563  * Return: 0 on success, -1 on failure.
 564  */
 565 static int rsi_sdio_host_intf_write_pkt(struct rsi_hw *adapter,
 566                                         u8 *pkt,
 567                                         u32 len)
 568 {
 569         struct rsi_91x_sdiodev *dev =
 570                 (struct rsi_91x_sdiodev *)adapter->rsi_dev;
 571         u32 block_size = dev->tx_blk_size;
 572         u32 num_blocks, address, length;
 573         u32 queueno;
 574         int status;
 575
 576         queueno = ((pkt[1] >> 4) & 0xf);
 577
 578         num_blocks = len / block_size;
 579
 580         if (len % block_size)
 581                 num_blocks++;
 582
 583         address = (num_blocks * block_size | (queueno << 12));
 584         length  = num_blocks * block_size;
 585
 586         status = rsi_sdio_write_register_multiple(adapter,
 587                                                   address,
 588                                                   (u8 *)pkt,
 589                                                   length);
 590         if (status)
 591                 rsi_dbg(ERR_ZONE, "%s: Unable to write onto the card: %d\n",
 592                         __func__, status);
 593         rsi_dbg(DATA_TX_ZONE, "%s: Successfully written onto card\n", __func__);
 594         return status;
 595 }
 596
 597 /**
 598  * rsi_sdio_host_intf_read_pkt() - This function reads the packet
 599                                    from the device.
 600  * @adapter: Pointer to the adapter data structure.
 601  * @pkt: Pointer to the packet data to be read from the the device.
 602  * @length: Length of the data to be read from the device.
 603  *
 604  * Return: 0 on success, -1 on failure.
 605  */
 606 int rsi_sdio_host_intf_read_pkt(struct rsi_hw *adapter,
 607                                 u8 *pkt,
 608                                 u32 length)
 609 {
 610         int status = -EINVAL;
 611
 612         if (!length) {
 613                 rsi_dbg(ERR_ZONE, "%s: Pkt size is zero\n", __func__);
 614                 return status;
 615         }
 616
 617         status = rsi_sdio_read_register_multiple(adapter,
 618                                                  length,
 619                                                  length, /*num of bytes*/
 620                                                  (u8 *)pkt);
 621
 622         if (status)
 623                 rsi_dbg(ERR_ZONE, "%s: Failed to read frame: %d\n", __func__,
 624                         status);
 625         return status;
 626 }
 627
 628 /**
 629  * rsi_init_sdio_interface() - This function does init specific to SDIO.
 630  *
 631  * @adapter: Pointer to the adapter data structure.
 632  * @pkt: Pointer to the packet data to be read from the the device.
 633  *
 634  * Return: 0 on success, -1 on failure.
 635  */
 636
 637 static int rsi_init_sdio_interface(struct rsi_hw *adapter,
 638                                    struct sdio_func *pfunction)
 639 {
 640         struct rsi_91x_sdiodev *rsi_91x_dev;
 641         int status = -ENOMEM;
 642
 643         rsi_91x_dev = kzalloc(sizeof(*rsi_91x_dev), GFP_KERNEL);
 644         if (!rsi_91x_dev)
 645                 return status;
 646
 647         adapter->rsi_dev = rsi_91x_dev;
 648
 649         sdio_claim_host(pfunction);
 650
 651         pfunction->enable_timeout = 100;
 652         status = sdio_enable_func(pfunction);
 653         if (status) {
 654                 rsi_dbg(ERR_ZONE, "%s: Failed to enable interface\n", __func__);
 655                 sdio_release_host(pfunction);
 656                 return status;
 657         }
 658
 659         rsi_dbg(INIT_ZONE, "%s: Enabled the interface\n", __func__);
 660
 661         rsi_91x_dev->pfunction = pfunction;
 662         adapter->device = &pfunction->dev;
 663
 664         sdio_set_drvdata(pfunction, adapter);
 665
 666         status = rsi_setupcard(adapter);
 667         if (status) {
 668                 rsi_dbg(ERR_ZONE, "%s: Failed to setup card\n", __func__);
 669                 goto fail;
 670         }
 671
 672         rsi_dbg(INIT_ZONE, "%s: Setup card succesfully\n", __func__);
 673
 674         status = rsi_init_sdio_slave_regs(adapter);
 675         if (status) {
 676                 rsi_dbg(ERR_ZONE, "%s: Failed to init slave regs\n", __func__);
 677                 goto fail;
 678         }
 679         sdio_release_host(pfunction);
 680
 681         adapter->host_intf_write_pkt = rsi_sdio_host_intf_write_pkt;
 682         adapter->host_intf_read_pkt = rsi_sdio_host_intf_read_pkt;
 683         adapter->determine_event_timeout = rsi_sdio_determine_event_timeout;
 684         adapter->check_hw_queue_status = rsi_sdio_read_buffer_status_register;
 685
 686 #ifdef CONFIG_RSI_DEBUGFS
 687         adapter->num_debugfs_entries = MAX_DEBUGFS_ENTRIES;
 688 #endif
 689         return status;
 690 fail:
 691         sdio_disable_func(pfunction);
 692         sdio_release_host(pfunction);
 693         return status;
 694 }
 695
 696 /**
 697  * rsi_probe() - This function is called by kernel when the driver provided
 698  *               Vendor and device IDs are matched. All the initialization
 699  *               work is done here.
 700  * @pfunction: Pointer to the sdio_func structure.
 701  * @id: Pointer to sdio_device_id structure.
 702  *
 703  * Return: 0 on success, 1 on failure.
 704  */
 705 static int rsi_probe(struct sdio_func *pfunction,
 706                      const struct sdio_device_id *id)
 707 {
 708         struct rsi_hw *adapter;
 709
 710         rsi_dbg(INIT_ZONE, "%s: Init function called\n", __func__);
 711
 712         adapter = rsi_91x_init();
 713         if (!adapter) {
 714                 rsi_dbg(ERR_ZONE, "%s: Failed to init os intf ops\n",
 715                         __func__);
 716                 return 1;
 717         }
 718
 719         if (rsi_init_sdio_interface(adapter, pfunction)) {
 720                 rsi_dbg(ERR_ZONE, "%s: Failed to init sdio interface\n",
 721                         __func__);
 722                 goto fail;
 723         }
 724
 725         if (rsi_sdio_device_init(adapter->priv)) {
 726                 rsi_dbg(ERR_ZONE, "%s: Failed in device init\n", __func__);
 727                 sdio_claim_host(pfunction);
 728                 sdio_disable_func(pfunction);
 729                 sdio_release_host(pfunction);
 730                 goto fail;
 731         }
 732
 733         sdio_claim_host(pfunction);
 734         if (sdio_claim_irq(pfunction, rsi_handle_interrupt)) {
 735                 rsi_dbg(ERR_ZONE, "%s: Failed to request IRQ\n", __func__);
 736                 sdio_release_host(pfunction);
 737                 goto fail;
 738         }
 739
 740         sdio_release_host(pfunction);
 741         rsi_dbg(INIT_ZONE, "%s: Registered Interrupt handler\n", __func__);
 742
 743         return 0;
 744 fail:
 745         rsi_91x_deinit(adapter);
 746         rsi_dbg(ERR_ZONE, "%s: Failed in probe...Exiting\n", __func__);
 747         return 1;
 748 }
 749
 750 /**
 751  * rsi_disconnect() - This function performs the reverse of the probe function.
 752  * @pfunction: Pointer to the sdio_func structure.
 753  *
 754  * Return: void.
 755  */
 756 static void rsi_disconnect(struct sdio_func *pfunction)
 757 {
 758         struct rsi_hw *adapter = sdio_get_drvdata(pfunction);
 759         struct rsi_91x_sdiodev *dev =
 760                 (struct rsi_91x_sdiodev *)adapter->rsi_dev;
 761
 762         if (!adapter)
 763                 return;
 764
 765         dev->write_fail = 2;
 766         rsi_mac80211_detach(adapter);
 767
 768         sdio_claim_host(pfunction);
 769         sdio_release_irq(pfunction);
 770         sdio_disable_func(pfunction);
 771         rsi_91x_deinit(adapter);
 772         /* Resetting to take care of the case, where-in driver is re-loaded */
 773         rsi_reset_card(pfunction);
 774         sdio_release_host(pfunction);
 775 }
 776
 777 #ifdef CONFIG_PM
 778 static int rsi_suspend(struct device *dev)
 779 {
 780         /* Not yet implemented */
 781         return -ENOSYS;
 782 }
 783
 784 static int rsi_resume(struct device *dev)
 785 {
 786         /* Not yet implemented */
 787         return -ENOSYS;
 788 }
 789
 790 static const struct dev_pm_ops rsi_pm_ops = {
 791         .suspend = rsi_suspend,
 792         .resume = rsi_resume,
 793 };
 794 #endif
 795
 796 static const struct sdio_device_id rsi_dev_table[] =  {
 797         { SDIO_DEVICE(0x303, 0x100) },
 798         { SDIO_DEVICE(0x041B, 0x0301) },
 799         { SDIO_DEVICE(0x041B, 0x0201) },
 800         { SDIO_DEVICE(0x041B, 0x9330) },
 801         { /* Blank */},
 802 };
 803
 804 static struct sdio_driver rsi_driver = {
 805         .name       = "RSI-SDIO WLAN",
 806         .probe      = rsi_probe,
 807         .remove     = rsi_disconnect,
 808         .id_table   = rsi_dev_table,
 809 #ifdef CONFIG_PM
 810         .drv = {
 811                 .pm = &rsi_pm_ops,
 812         }
 813 #endif
 814 };
 815
 816 /**
 817  * rsi_module_init() - This function registers the sdio module.
 818  * @void: Void.
 819  *
 820  * Return: 0 on success.
 821  */
 822 static int rsi_module_init(void)
 823 {
 824         sdio_register_driver(&rsi_driver);
 825         rsi_dbg(INIT_ZONE, "%s: Registering driver\n", __func__);
 826         return 0;
 827 }
 828
 829 /**
 830  * rsi_module_exit() - This function unregisters the sdio module.
 831  * @void: Void.
 832  *
 833  * Return: None.
 834  */
 835 static void rsi_module_exit(void)
 836 {
 837         sdio_unregister_driver(&rsi_driver);
 838         rsi_dbg(INFO_ZONE, "%s: Unregistering driver\n", __func__);
 839 }
 840
 841 module_init(rsi_module_init);
 842 module_exit(rsi_module_exit);
 843
 844 MODULE_AUTHOR("Redpine Signals Inc");
 845 MODULE_DESCRIPTION("Common SDIO layer for RSI drivers");
 846 MODULE_SUPPORTED_DEVICE("RSI-91x");
 847 MODULE_DEVICE_TABLE(sdio, rsi_dev_table);
 848 MODULE_FIRMWARE(FIRMWARE_RSI9113);
 849 MODULE_VERSION("0.1");
 850 MODULE_LICENSE("Dual BSD/GPL");