git.oblomov.eu Git - linux-2.6/blob - drivers/net/wireless/libertas/if_sdio.c

   1 /*
   2  *  linux/drivers/net/wireless/libertas/if_sdio.c
   3  *
   4  *  Copyright 2007-2008 Pierre Ossman
   5  *
   6  * Inspired by if_cs.c, Copyright 2007 Holger Schurig
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or (at
  11  * your option) any later version.
  12  *
  13  * This hardware has more or less no CMD53 support, so all registers
  14  * must be accessed using sdio_readb()/sdio_writeb().
  15  *
  16  * Transfers must be in one transaction or the firmware goes bonkers.
  17  * This means that the transfer must either be small enough to do a
  18  * byte based transfer or it must be padded to a multiple of the
  19  * current block size.
  20  *
  21  * As SDIO is still new to the kernel, it is unfortunately common with
  22  * bugs in the host controllers related to that. One such bug is that
  23  * controllers cannot do transfers that aren't a multiple of 4 bytes.
  24  * If you don't have time to fix the host controller driver, you can
  25  * work around the problem by modifying if_sdio_host_to_card() and
  26  * if_sdio_card_to_host() to pad the data.
  27  */
  28
  29 #include <linux/kernel.h>
  30 #include <linux/moduleparam.h>
  31 #include <linux/firmware.h>
  32 #include <linux/netdevice.h>
  33 #include <linux/delay.h>
  34 #include <linux/mmc/card.h>
  35 #include <linux/mmc/sdio_func.h>
  36 #include <linux/mmc/sdio_ids.h>
  37
  38 #include "host.h"
  39 #include "decl.h"
  40 #include "defs.h"
  41 #include "dev.h"
  42 #include "cmd.h"
  43 #include "if_sdio.h"
  44
  45 /* The if_sdio_remove() callback function is called when
  46  * user removes this module from kernel space or ejects
  47  * the card from the slot. The driver handles these 2 cases
  48  * differently for SD8688 combo chip.
  49  * If the user is removing the module, the FUNC_SHUTDOWN
  50  * command for SD8688 is sent to the firmware.
  51  * If the card is removed, there is no need to send this command.
  52  *
  53  * The variable 'user_rmmod' is used to distinguish these two
  54  * scenarios. This flag is initialized as FALSE in case the card
  55  * is removed, and will be set to TRUE for module removal when
  56  * module_exit function is called.
  57  */
  58 static u8 user_rmmod;
  59
  60 static char *lbs_helper_name = NULL;
  61 module_param_named(helper_name, lbs_helper_name, charp, 0644);
  62
  63 static char *lbs_fw_name = NULL;
  64 module_param_named(fw_name, lbs_fw_name, charp, 0644);
  65
  66 static const struct sdio_device_id if_sdio_ids[] = {
  67         { SDIO_DEVICE(SDIO_VENDOR_ID_MARVELL,
  68                         SDIO_DEVICE_ID_MARVELL_LIBERTAS) },
  69         { SDIO_DEVICE(SDIO_VENDOR_ID_MARVELL,
  70                         SDIO_DEVICE_ID_MARVELL_8688WLAN) },
  71         { /* end: all zeroes */                         },
  72 };
  73
  74 MODULE_DEVICE_TABLE(sdio, if_sdio_ids);
  75
  76 struct if_sdio_model {
  77         int model;
  78         const char *helper;
  79         const char *firmware;
  80 };
  81
  82 static struct if_sdio_model if_sdio_models[] = {
  83         {
  84                 /* 8385 */
  85                 .model = IF_SDIO_MODEL_8385,
  86                 .helper = "sd8385_helper.bin",
  87                 .firmware = "sd8385.bin",
  88         },
  89         {
  90                 /* 8686 */
  91                 .model = IF_SDIO_MODEL_8686,
  92                 .helper = "sd8686_helper.bin",
  93                 .firmware = "sd8686.bin",
  94         },
  95         {
  96                 /* 8688 */
  97                 .model = IF_SDIO_MODEL_8688,
  98                 .helper = "sd8688_helper.bin",
  99                 .firmware = "sd8688.bin",
 100         },
 101 };
 102
 103 struct if_sdio_packet {
 104         struct if_sdio_packet   *next;
 105         u16                     nb;
 106         u8                      buffer[0] __attribute__((aligned(4)));
 107 };
 108
 109 struct if_sdio_card {
 110         struct sdio_func        *func;
 111         struct lbs_private      *priv;
 112
 113         int                     model;
 114         unsigned long           ioport;
 115         unsigned int            scratch_reg;
 116
 117         const char              *helper;
 118         const char              *firmware;
 119
 120         u8                      buffer[65536];
 121
 122         spinlock_t              lock;
 123         struct if_sdio_packet   *packets;
 124
 125         struct workqueue_struct *workqueue;
 126         struct work_struct      packet_worker;
 127
 128         u8                      rx_unit;
 129 };
 130
 131 /********************************************************************/
 132 /* I/O                                                              */
 133 /********************************************************************/
 134
 135 /*
 136  *  For SD8385/SD8686, this function reads firmware status after
 137  *  the image is downloaded, or reads RX packet length when
 138  *  interrupt (with IF_SDIO_H_INT_UPLD bit set) is received.
 139  *  For SD8688, this function reads firmware status only.
 140  */
 141 static u16 if_sdio_read_scratch(struct if_sdio_card *card, int *err)
 142 {
 143         int ret;
 144         u16 scratch;
 145
 146         scratch = sdio_readb(card->func, card->scratch_reg, &ret);
 147         if (!ret)
 148                 scratch |= sdio_readb(card->func, card->scratch_reg + 1,
 149                                         &ret) << 8;
 150
 151         if (err)
 152                 *err = ret;
 153
 154         if (ret)
 155                 return 0xffff;
 156
 157         return scratch;
 158 }
 159
 160 static u8 if_sdio_read_rx_unit(struct if_sdio_card *card)
 161 {
 162         int ret;
 163         u8 rx_unit;
 164
 165         rx_unit = sdio_readb(card->func, IF_SDIO_RX_UNIT, &ret);
 166
 167         if (ret)
 168                 rx_unit = 0;
 169
 170         return rx_unit;
 171 }
 172
 173 static u16 if_sdio_read_rx_len(struct if_sdio_card *card, int *err)
 174 {
 175         int ret;
 176         u16 rx_len;
 177
 178         switch (card->model) {
 179         case IF_SDIO_MODEL_8385:
 180         case IF_SDIO_MODEL_8686:
 181                 rx_len = if_sdio_read_scratch(card, &ret);
 182                 break;
 183         case IF_SDIO_MODEL_8688:
 184         default: /* for newer chipsets */
 185                 rx_len = sdio_readb(card->func, IF_SDIO_RX_LEN, &ret);
 186                 if (!ret)
 187                         rx_len <<= card->rx_unit;
 188                 else
 189                         rx_len = 0xffff;        /* invalid length */
 190
 191                 break;
 192         }
 193
 194         if (err)
 195                 *err = ret;
 196
 197         return rx_len;
 198 }
 199
 200 static int if_sdio_handle_cmd(struct if_sdio_card *card,
 201                 u8 *buffer, unsigned size)
 202 {
 203         struct lbs_private *priv = card->priv;
 204         int ret;
 205         unsigned long flags;
 206         u8 i;
 207
 208         lbs_deb_enter(LBS_DEB_SDIO);
 209
 210         if (size > LBS_CMD_BUFFER_SIZE) {
 211                 lbs_deb_sdio("response packet too large (%d bytes)\n",
 212                         (int)size);
 213                 ret = -E2BIG;
 214                 goto out;
 215         }
 216
 217         spin_lock_irqsave(&priv->driver_lock, flags);
 218
 219         i = (priv->resp_idx == 0) ? 1 : 0;
 220         BUG_ON(priv->resp_len[i]);
 221         priv->resp_len[i] = size;
 222         memcpy(priv->resp_buf[i], buffer, size);
 223         lbs_notify_command_response(priv, i);
 224
 225         spin_unlock_irqrestore(&card->priv->driver_lock, flags);
 226
 227         ret = 0;
 228
 229 out:
 230         lbs_deb_leave_args(LBS_DEB_SDIO, "ret %d", ret);
 231         return ret;
 232 }
 233
 234 static int if_sdio_handle_data(struct if_sdio_card *card,
 235                 u8 *buffer, unsigned size)
 236 {
 237         int ret;
 238         struct sk_buff *skb;
 239         char *data;
 240
 241         lbs_deb_enter(LBS_DEB_SDIO);
 242
 243         if (size > MRVDRV_ETH_RX_PACKET_BUFFER_SIZE) {
 244                 lbs_deb_sdio("response packet too large (%d bytes)\n",
 245                         (int)size);
 246                 ret = -E2BIG;
 247                 goto out;
 248         }
 249
 250         skb = dev_alloc_skb(MRVDRV_ETH_RX_PACKET_BUFFER_SIZE + NET_IP_ALIGN);
 251         if (!skb) {
 252                 ret = -ENOMEM;
 253                 goto out;
 254         }
 255
 256         skb_reserve(skb, NET_IP_ALIGN);
 257
 258         data = skb_put(skb, size);
 259
 260         memcpy(data, buffer, size);
 261
 262         lbs_process_rxed_packet(card->priv, skb);
 263
 264         ret = 0;
 265
 266 out:
 267         lbs_deb_leave_args(LBS_DEB_SDIO, "ret %d", ret);
 268
 269         return ret;
 270 }
 271
 272 static int if_sdio_handle_event(struct if_sdio_card *card,
 273                 u8 *buffer, unsigned size)
 274 {
 275         int ret;
 276         u32 event;
 277
 278         lbs_deb_enter(LBS_DEB_SDIO);
 279
 280         if (card->model == IF_SDIO_MODEL_8385) {
 281                 event = sdio_readb(card->func, IF_SDIO_EVENT, &ret);
 282                 if (ret)
 283                         goto out;
 284
 285                 /* right shift 3 bits to get the event id */
 286                 event >>= 3;
 287         } else {
 288                 if (size < 4) {
 289                         lbs_deb_sdio("event packet too small (%d bytes)\n",
 290                                 (int)size);
 291                         ret = -EINVAL;
 292                         goto out;
 293                 }
 294                 event = buffer[3] << 24;
 295                 event |= buffer[2] << 16;
 296                 event |= buffer[1] << 8;
 297                 event |= buffer[0] << 0;
 298         }
 299
 300         lbs_queue_event(card->priv, event & 0xFF);
 301         ret = 0;
 302
 303 out:
 304         lbs_deb_leave_args(LBS_DEB_SDIO, "ret %d", ret);
 305
 306         return ret;
 307 }
 308
 309 static int if_sdio_card_to_host(struct if_sdio_card *card)
 310 {
 311         int ret;
 312         u8 status;
 313         u16 size, type, chunk;
 314         unsigned long timeout;
 315
 316         lbs_deb_enter(LBS_DEB_SDIO);
 317
 318         size = if_sdio_read_rx_len(card, &ret);
 319         if (ret)
 320                 goto out;
 321
 322         if (size < 4) {
 323                 lbs_deb_sdio("invalid packet size (%d bytes) from firmware\n",
 324                         (int)size);
 325                 ret = -EINVAL;
 326                 goto out;
 327         }
 328
 329         timeout = jiffies + HZ;
 330         while (1) {
 331                 status = sdio_readb(card->func, IF_SDIO_STATUS, &ret);
 332                 if (ret)
 333                         goto out;
 334                 if (status & IF_SDIO_IO_RDY)
 335                         break;
 336                 if (time_after(jiffies, timeout)) {
 337                         ret = -ETIMEDOUT;
 338                         goto out;
 339                 }
 340                 mdelay(1);
 341         }
 342
 343         /*
 344          * The transfer must be in one transaction or the firmware
 345          * goes suicidal. There's no way to guarantee that for all
 346          * controllers, but we can at least try.
 347          */
 348         chunk = sdio_align_size(card->func, size);
 349
 350         ret = sdio_readsb(card->func, card->buffer, card->ioport, chunk);
 351         if (ret)
 352                 goto out;
 353
 354         chunk = card->buffer[0] | (card->buffer[1] << 8);
 355         type = card->buffer[2] | (card->buffer[3] << 8);
 356
 357         lbs_deb_sdio("packet of type %d and size %d bytes\n",
 358                 (int)type, (int)chunk);
 359
 360         if (chunk > size) {
 361                 lbs_deb_sdio("packet fragment (%d > %d)\n",
 362                         (int)chunk, (int)size);
 363                 ret = -EINVAL;
 364                 goto out;
 365         }
 366
 367         if (chunk < size) {
 368                 lbs_deb_sdio("packet fragment (%d < %d)\n",
 369                         (int)chunk, (int)size);
 370         }
 371
 372         switch (type) {
 373         case MVMS_CMD:
 374                 ret = if_sdio_handle_cmd(card, card->buffer + 4, chunk - 4);
 375                 if (ret)
 376                         goto out;
 377                 break;
 378         case MVMS_DAT:
 379                 ret = if_sdio_handle_data(card, card->buffer + 4, chunk - 4);
 380                 if (ret)
 381                         goto out;
 382                 break;
 383         case MVMS_EVENT:
 384                 ret = if_sdio_handle_event(card, card->buffer + 4, chunk - 4);
 385                 if (ret)
 386                         goto out;
 387                 break;
 388         default:
 389                 lbs_deb_sdio("invalid type (%d) from firmware\n",
 390                                 (int)type);
 391                 ret = -EINVAL;
 392                 goto out;
 393         }
 394
 395 out:
 396         if (ret)
 397                 lbs_pr_err("problem fetching packet from firmware\n");
 398
 399         lbs_deb_leave_args(LBS_DEB_SDIO, "ret %d", ret);
 400
 401         return ret;
 402 }
 403
 404 static void if_sdio_host_to_card_worker(struct work_struct *work)
 405 {
 406         struct if_sdio_card *card;
 407         struct if_sdio_packet *packet;
 408         unsigned long timeout;
 409         u8 status;
 410         int ret;
 411         unsigned long flags;
 412
 413         lbs_deb_enter(LBS_DEB_SDIO);
 414
 415         card = container_of(work, struct if_sdio_card, packet_worker);
 416
 417         while (1) {
 418                 spin_lock_irqsave(&card->lock, flags);
 419                 packet = card->packets;
 420                 if (packet)
 421                         card->packets = packet->next;
 422                 spin_unlock_irqrestore(&card->lock, flags);
 423
 424                 if (!packet)
 425                         break;
 426
 427                 sdio_claim_host(card->func);
 428
 429                 timeout = jiffies + HZ;
 430                 while (1) {
 431                         status = sdio_readb(card->func, IF_SDIO_STATUS, &ret);
 432                         if (ret)
 433                                 goto release;
 434                         if (status & IF_SDIO_IO_RDY)
 435                                 break;
 436                         if (time_after(jiffies, timeout)) {
 437                                 ret = -ETIMEDOUT;
 438                                 goto release;
 439                         }
 440                         mdelay(1);
 441                 }
 442
 443                 ret = sdio_writesb(card->func, card->ioport,
 444                                 packet->buffer, packet->nb);
 445                 if (ret)
 446                         goto release;
 447 release:
 448                 sdio_release_host(card->func);
 449
 450                 kfree(packet);
 451         }
 452
 453         lbs_deb_leave(LBS_DEB_SDIO);
 454 }
 455
 456 /********************************************************************/
 457 /* Firmware                                                         */
 458 /********************************************************************/
 459
 460 static int if_sdio_prog_helper(struct if_sdio_card *card)
 461 {
 462         int ret;
 463         u8 status;
 464         const struct firmware *fw;
 465         unsigned long timeout;
 466         u8 *chunk_buffer;
 467         u32 chunk_size;
 468         const u8 *firmware;
 469         size_t size;
 470
 471         lbs_deb_enter(LBS_DEB_SDIO);
 472
 473         ret = request_firmware(&fw, card->helper, &card->func->dev);
 474         if (ret) {
 475                 lbs_pr_err("can't load helper firmware\n");
 476                 goto out;
 477         }
 478
 479         chunk_buffer = kzalloc(64, GFP_KERNEL);
 480         if (!chunk_buffer) {
 481                 ret = -ENOMEM;
 482                 goto release_fw;
 483         }
 484
 485         sdio_claim_host(card->func);
 486
 487         ret = sdio_set_block_size(card->func, 32);
 488         if (ret)
 489                 goto release;
 490
 491         firmware = fw->data;
 492         size = fw->size;
 493
 494         while (size) {
 495                 timeout = jiffies + HZ;
 496                 while (1) {
 497                         status = sdio_readb(card->func, IF_SDIO_STATUS, &ret);
 498                         if (ret)
 499                                 goto release;
 500                         if ((status & IF_SDIO_IO_RDY) &&
 501                                         (status & IF_SDIO_DL_RDY))
 502                                 break;
 503                         if (time_after(jiffies, timeout)) {
 504                                 ret = -ETIMEDOUT;
 505                                 goto release;
 506                         }
 507                         mdelay(1);
 508                 }
 509
 510                 chunk_size = min(size, (size_t)60);
 511
 512                 *((__le32*)chunk_buffer) = cpu_to_le32(chunk_size);
 513                 memcpy(chunk_buffer + 4, firmware, chunk_size);
 514 /*
 515                 lbs_deb_sdio("sending %d bytes chunk\n", chunk_size);
 516 */
 517                 ret = sdio_writesb(card->func, card->ioport,
 518                                 chunk_buffer, 64);
 519                 if (ret)
 520                         goto release;
 521
 522                 firmware += chunk_size;
 523                 size -= chunk_size;
 524         }
 525
 526         /* an empty block marks the end of the transfer */
 527         memset(chunk_buffer, 0, 4);
 528         ret = sdio_writesb(card->func, card->ioport, chunk_buffer, 64);
 529         if (ret)
 530                 goto release;
 531
 532         lbs_deb_sdio("waiting for helper to boot...\n");
 533
 534         /* wait for the helper to boot by looking at the size register */
 535         timeout = jiffies + HZ;
 536         while (1) {
 537                 u16 req_size;
 538
 539                 req_size = sdio_readb(card->func, IF_SDIO_RD_BASE, &ret);
 540                 if (ret)
 541                         goto release;
 542
 543                 req_size |= sdio_readb(card->func, IF_SDIO_RD_BASE + 1, &ret) << 8;
 544                 if (ret)
 545                         goto release;
 546
 547                 if (req_size != 0)
 548                         break;
 549
 550                 if (time_after(jiffies, timeout)) {
 551                         ret = -ETIMEDOUT;
 552                         goto release;
 553                 }
 554
 555                 msleep(10);
 556         }
 557
 558         ret = 0;
 559
 560 release:
 561         sdio_release_host(card->func);
 562         kfree(chunk_buffer);
 563 release_fw:
 564         release_firmware(fw);
 565
 566 out:
 567         if (ret)
 568                 lbs_pr_err("failed to load helper firmware\n");
 569
 570         lbs_deb_leave_args(LBS_DEB_SDIO, "ret %d", ret);
 571
 572         return ret;
 573 }
 574
 575 static int if_sdio_prog_real(struct if_sdio_card *card)
 576 {
 577         int ret;
 578         u8 status;
 579         const struct firmware *fw;
 580         unsigned long timeout;
 581         u8 *chunk_buffer;
 582         u32 chunk_size;
 583         const u8 *firmware;
 584         size_t size, req_size;
 585
 586         lbs_deb_enter(LBS_DEB_SDIO);
 587
 588         ret = request_firmware(&fw, card->firmware, &card->func->dev);
 589         if (ret) {
 590                 lbs_pr_err("can't load firmware\n");
 591                 goto out;
 592         }
 593
 594         chunk_buffer = kzalloc(512, GFP_KERNEL);
 595         if (!chunk_buffer) {
 596                 ret = -ENOMEM;
 597                 goto release_fw;
 598         }
 599
 600         sdio_claim_host(card->func);
 601
 602         ret = sdio_set_block_size(card->func, 32);
 603         if (ret)
 604                 goto release;
 605
 606         firmware = fw->data;
 607         size = fw->size;
 608
 609         while (size) {
 610                 timeout = jiffies + HZ;
 611                 while (1) {
 612                         status = sdio_readb(card->func, IF_SDIO_STATUS, &ret);
 613                         if (ret)
 614                                 goto release;
 615                         if ((status & IF_SDIO_IO_RDY) &&
 616                                         (status & IF_SDIO_DL_RDY))
 617                                 break;
 618                         if (time_after(jiffies, timeout)) {
 619                                 ret = -ETIMEDOUT;
 620                                 goto release;
 621                         }
 622                         mdelay(1);
 623                 }
 624
 625                 req_size = sdio_readb(card->func, IF_SDIO_RD_BASE, &ret);
 626                 if (ret)
 627                         goto release;
 628
 629                 req_size |= sdio_readb(card->func, IF_SDIO_RD_BASE + 1, &ret) << 8;
 630                 if (ret)
 631                         goto release;
 632 /*
 633                 lbs_deb_sdio("firmware wants %d bytes\n", (int)req_size);
 634 */
 635                 if (req_size == 0) {
 636                         lbs_deb_sdio("firmware helper gave up early\n");
 637                         ret = -EIO;
 638                         goto release;
 639                 }
 640
 641                 if (req_size & 0x01) {
 642                         lbs_deb_sdio("firmware helper signalled error\n");
 643                         ret = -EIO;
 644                         goto release;
 645                 }
 646
 647                 if (req_size > size)
 648                         req_size = size;
 649
 650                 while (req_size) {
 651                         chunk_size = min(req_size, (size_t)512);
 652
 653                         memcpy(chunk_buffer, firmware, chunk_size);
 654 /*
 655                         lbs_deb_sdio("sending %d bytes (%d bytes) chunk\n",
 656                                 chunk_size, (chunk_size + 31) / 32 * 32);
 657 */
 658                         ret = sdio_writesb(card->func, card->ioport,
 659                                 chunk_buffer, roundup(chunk_size, 32));
 660                         if (ret)
 661                                 goto release;
 662
 663                         firmware += chunk_size;
 664                         size -= chunk_size;
 665                         req_size -= chunk_size;
 666                 }
 667         }
 668
 669         ret = 0;
 670
 671         lbs_deb_sdio("waiting for firmware to boot...\n");
 672
 673         /* wait for the firmware to boot */
 674         timeout = jiffies + HZ;
 675         while (1) {
 676                 u16 scratch;
 677
 678                 scratch = if_sdio_read_scratch(card, &ret);
 679                 if (ret)
 680                         goto release;
 681
 682                 if (scratch == IF_SDIO_FIRMWARE_OK)
 683                         break;
 684
 685                 if (time_after(jiffies, timeout)) {
 686                         ret = -ETIMEDOUT;
 687                         goto release;
 688                 }
 689
 690                 msleep(10);
 691         }
 692
 693         ret = 0;
 694
 695 release:
 696         sdio_release_host(card->func);
 697         kfree(chunk_buffer);
 698 release_fw:
 699         release_firmware(fw);
 700
 701 out:
 702         if (ret)
 703                 lbs_pr_err("failed to load firmware\n");
 704
 705         lbs_deb_leave_args(LBS_DEB_SDIO, "ret %d", ret);
 706
 707         return ret;
 708 }
 709
 710 static int if_sdio_prog_firmware(struct if_sdio_card *card)
 711 {
 712         int ret;
 713         u16 scratch;
 714
 715         lbs_deb_enter(LBS_DEB_SDIO);
 716
 717         sdio_claim_host(card->func);
 718         scratch = if_sdio_read_scratch(card, &ret);
 719         sdio_release_host(card->func);
 720
 721         if (ret)
 722                 goto out;
 723
 724         lbs_deb_sdio("firmware status = %#x\n", scratch);
 725
 726         if (scratch == IF_SDIO_FIRMWARE_OK) {
 727                 lbs_deb_sdio("firmware already loaded\n");
 728                 goto success;
 729         }
 730
 731         ret = if_sdio_prog_helper(card);
 732         if (ret)
 733                 goto out;
 734
 735         ret = if_sdio_prog_real(card);
 736         if (ret)
 737                 goto out;
 738
 739 success:
 740         sdio_claim_host(card->func);
 741         sdio_set_block_size(card->func, IF_SDIO_BLOCK_SIZE);
 742         sdio_release_host(card->func);
 743         ret = 0;
 744
 745 out:
 746         lbs_deb_leave_args(LBS_DEB_SDIO, "ret %d", ret);
 747
 748         return ret;
 749 }
 750
 751 /*******************************************************************/
 752 /* Libertas callbacks                                              */
 753 /*******************************************************************/
 754
 755 static int if_sdio_host_to_card(struct lbs_private *priv,
 756                 u8 type, u8 *buf, u16 nb)
 757 {
 758         int ret;
 759         struct if_sdio_card *card;
 760         struct if_sdio_packet *packet, *cur;
 761         u16 size;
 762         unsigned long flags;
 763
 764         lbs_deb_enter_args(LBS_DEB_SDIO, "type %d, bytes %d", type, nb);
 765
 766         card = priv->card;
 767
 768         if (nb > (65536 - sizeof(struct if_sdio_packet) - 4)) {
 769                 ret = -EINVAL;
 770                 goto out;
 771         }
 772
 773         /*
 774          * The transfer must be in one transaction or the firmware
 775          * goes suicidal. There's no way to guarantee that for all
 776          * controllers, but we can at least try.
 777          */
 778         size = sdio_align_size(card->func, nb + 4);
 779
 780         packet = kzalloc(sizeof(struct if_sdio_packet) + size,
 781                         GFP_ATOMIC);
 782         if (!packet) {
 783                 ret = -ENOMEM;
 784                 goto out;
 785         }
 786
 787         packet->next = NULL;
 788         packet->nb = size;
 789
 790         /*
 791          * SDIO specific header.
 792          */
 793         packet->buffer[0] = (nb + 4) & 0xff;
 794         packet->buffer[1] = ((nb + 4) >> 8) & 0xff;
 795         packet->buffer[2] = type;
 796         packet->buffer[3] = 0;
 797
 798         memcpy(packet->buffer + 4, buf, nb);
 799
 800         spin_lock_irqsave(&card->lock, flags);
 801
 802         if (!card->packets)
 803                 card->packets = packet;
 804         else {
 805                 cur = card->packets;
 806                 while (cur->next)
 807                         cur = cur->next;
 808                 cur->next = packet;
 809         }
 810
 811         switch (type) {
 812         case MVMS_CMD:
 813                 priv->dnld_sent = DNLD_CMD_SENT;
 814                 break;
 815         case MVMS_DAT:
 816                 priv->dnld_sent = DNLD_DATA_SENT;
 817                 break;
 818         default:
 819                 lbs_deb_sdio("unknown packet type %d\n", (int)type);
 820         }
 821
 822         spin_unlock_irqrestore(&card->lock, flags);
 823
 824         queue_work(card->workqueue, &card->packet_worker);
 825
 826         ret = 0;
 827
 828 out:
 829         lbs_deb_leave_args(LBS_DEB_SDIO, "ret %d", ret);
 830
 831         return ret;
 832 }
 833
 834 /*******************************************************************/
 835 /* SDIO callbacks                                                  */
 836 /*******************************************************************/
 837
 838 static void if_sdio_interrupt(struct sdio_func *func)
 839 {
 840         int ret;
 841         struct if_sdio_card *card;
 842         u8 cause;
 843
 844         lbs_deb_enter(LBS_DEB_SDIO);
 845
 846         card = sdio_get_drvdata(func);
 847
 848         cause = sdio_readb(card->func, IF_SDIO_H_INT_STATUS, &ret);
 849         if (ret)
 850                 goto out;
 851
 852         lbs_deb_sdio("interrupt: 0x%X\n", (unsigned)cause);
 853
 854         sdio_writeb(card->func, ~cause, IF_SDIO_H_INT_STATUS, &ret);
 855         if (ret)
 856                 goto out;
 857
 858         /*
 859          * Ignore the define name, this really means the card has
 860          * successfully received the command.
 861          */
 862         if (cause & IF_SDIO_H_INT_DNLD)
 863                 lbs_host_to_card_done(card->priv);
 864
 865
 866         if (cause & IF_SDIO_H_INT_UPLD) {
 867                 ret = if_sdio_card_to_host(card);
 868                 if (ret)
 869                         goto out;
 870         }
 871
 872         ret = 0;
 873
 874 out:
 875         lbs_deb_leave_args(LBS_DEB_SDIO, "ret %d", ret);
 876 }
 877
 878 static int if_sdio_probe(struct sdio_func *func,
 879                 const struct sdio_device_id *id)
 880 {
 881         struct if_sdio_card *card;
 882         struct lbs_private *priv;
 883         int ret, i;
 884         unsigned int model;
 885         struct if_sdio_packet *packet;
 886
 887         lbs_deb_enter(LBS_DEB_SDIO);
 888
 889         for (i = 0;i < func->card->num_info;i++) {
 890                 if (sscanf(func->card->info[i],
 891                                 "802.11 SDIO ID: %x", &model) == 1)
 892                         break;
 893                 if (sscanf(func->card->info[i],
 894                                 "ID: %x", &model) == 1)
 895                         break;
 896                 if (!strcmp(func->card->info[i], "IBIS Wireless SDIO Card")) {
 897                         model = IF_SDIO_MODEL_8385;
 898                         break;
 899                 }
 900         }
 901
 902         if (i == func->card->num_info) {
 903                 lbs_pr_err("unable to identify card model\n");
 904                 return -ENODEV;
 905         }
 906
 907         card = kzalloc(sizeof(struct if_sdio_card), GFP_KERNEL);
 908         if (!card)
 909                 return -ENOMEM;
 910
 911         card->func = func;
 912         card->model = model;
 913
 914         switch (card->model) {
 915         case IF_SDIO_MODEL_8385:
 916                 card->scratch_reg = IF_SDIO_SCRATCH_OLD;
 917                 break;
 918         case IF_SDIO_MODEL_8686:
 919                 card->scratch_reg = IF_SDIO_SCRATCH;
 920                 break;
 921         case IF_SDIO_MODEL_8688:
 922         default: /* for newer chipsets */
 923                 card->scratch_reg = IF_SDIO_FW_STATUS;
 924                 break;
 925         }
 926
 927         spin_lock_init(&card->lock);
 928         card->workqueue = create_workqueue("libertas_sdio");
 929         INIT_WORK(&card->packet_worker, if_sdio_host_to_card_worker);
 930
 931         for (i = 0;i < ARRAY_SIZE(if_sdio_models);i++) {
 932                 if (card->model == if_sdio_models[i].model)
 933                         break;
 934         }
 935
 936         if (i == ARRAY_SIZE(if_sdio_models)) {
 937                 lbs_pr_err("unkown card model 0x%x\n", card->model);
 938                 ret = -ENODEV;
 939                 goto free;
 940         }
 941
 942         card->helper = if_sdio_models[i].helper;
 943         card->firmware = if_sdio_models[i].firmware;
 944
 945         if (lbs_helper_name) {
 946                 lbs_deb_sdio("overriding helper firmware: %s\n",
 947                         lbs_helper_name);
 948                 card->helper = lbs_helper_name;
 949         }
 950
 951         if (lbs_fw_name) {
 952                 lbs_deb_sdio("overriding firmware: %s\n", lbs_fw_name);
 953                 card->firmware = lbs_fw_name;
 954         }
 955
 956         sdio_claim_host(func);
 957
 958         ret = sdio_enable_func(func);
 959         if (ret)
 960                 goto release;
 961
 962         ret = sdio_claim_irq(func, if_sdio_interrupt);
 963         if (ret)
 964                 goto disable;
 965
 966         card->ioport = sdio_readb(func, IF_SDIO_IOPORT, &ret);
 967         if (ret)
 968                 goto release_int;
 969
 970         card->ioport |= sdio_readb(func, IF_SDIO_IOPORT + 1, &ret) << 8;
 971         if (ret)
 972                 goto release_int;
 973
 974         card->ioport |= sdio_readb(func, IF_SDIO_IOPORT + 2, &ret) << 16;
 975         if (ret)
 976                 goto release_int;
 977
 978         sdio_release_host(func);
 979
 980         sdio_set_drvdata(func, card);
 981
 982         lbs_deb_sdio("class = 0x%X, vendor = 0x%X, "
 983                         "device = 0x%X, model = 0x%X, ioport = 0x%X\n",
 984                         func->class, func->vendor, func->device,
 985                         model, (unsigned)card->ioport);
 986
 987         ret = if_sdio_prog_firmware(card);
 988         if (ret)
 989                 goto reclaim;
 990
 991         priv = lbs_add_card(card, &func->dev);
 992         if (!priv) {
 993                 ret = -ENOMEM;
 994                 goto reclaim;
 995         }
 996
 997         card->priv = priv;
 998
 999         priv->card = card;
1000         priv->hw_host_to_card = if_sdio_host_to_card;
1001
1002         priv->fw_ready = 1;
1003
1004         sdio_claim_host(func);
1005
1006         /*
1007          * Get rx_unit if the chip is SD8688 or newer.
1008          * SD8385 & SD8686 do not have rx_unit.
1009          */
1010         if ((card->model != IF_SDIO_MODEL_8385)
1011                         && (card->model != IF_SDIO_MODEL_8686))
1012                 card->rx_unit = if_sdio_read_rx_unit(card);
1013         else
1014                 card->rx_unit = 0;
1015
1016         /*
1017          * Enable interrupts now that everything is set up
1018          */
1019         sdio_writeb(func, 0x0f, IF_SDIO_H_INT_MASK, &ret);
1020         sdio_release_host(func);
1021         if (ret)
1022                 goto reclaim;
1023
1024         /*
1025          * FUNC_INIT is required for SD8688 WLAN/BT multiple functions
1026          */
1027         if (card->model == IF_SDIO_MODEL_8688) {
1028                 struct cmd_header cmd;
1029
1030                 memset(&cmd, 0, sizeof(cmd));
1031
1032                 lbs_deb_sdio("send function INIT command\n");
1033                 if (__lbs_cmd(priv, CMD_FUNC_INIT, &cmd, sizeof(cmd),
1034                                 lbs_cmd_copyback, (unsigned long) &cmd))
1035                         lbs_pr_alert("CMD_FUNC_INIT cmd failed\n");
1036         }
1037
1038         ret = lbs_start_card(priv);
1039         if (ret)
1040                 goto err_activate_card;
1041
1042         if (priv->fwcapinfo & FW_CAPINFO_PS)
1043                 priv->ps_supported = 1;
1044
1045 out:
1046         lbs_deb_leave_args(LBS_DEB_SDIO, "ret %d", ret);
1047
1048         return ret;
1049
1050 err_activate_card:
1051         flush_workqueue(card->workqueue);
1052         lbs_remove_card(priv);
1053 reclaim:
1054         sdio_claim_host(func);
1055 release_int:
1056         sdio_release_irq(func);
1057 disable:
1058         sdio_disable_func(func);
1059 release:
1060         sdio_release_host(func);
1061 free:
1062         destroy_workqueue(card->workqueue);
1063         while (card->packets) {
1064                 packet = card->packets;
1065                 card->packets = card->packets->next;
1066                 kfree(packet);
1067         }
1068
1069         kfree(card);
1070
1071         goto out;
1072 }
1073
1074 static void if_sdio_remove(struct sdio_func *func)
1075 {
1076         struct if_sdio_card *card;
1077         struct if_sdio_packet *packet;
1078
1079         lbs_deb_enter(LBS_DEB_SDIO);
1080
1081         card = sdio_get_drvdata(func);
1082
1083         if (user_rmmod && (card->model == IF_SDIO_MODEL_8688)) {
1084                 /*
1085                  * FUNC_SHUTDOWN is required for SD8688 WLAN/BT
1086                  * multiple functions
1087                  */
1088                 struct cmd_header cmd;
1089
1090                 memset(&cmd, 0, sizeof(cmd));
1091
1092                 lbs_deb_sdio("send function SHUTDOWN command\n");
1093                 if (__lbs_cmd(card->priv, CMD_FUNC_SHUTDOWN,
1094                                 &cmd, sizeof(cmd), lbs_cmd_copyback,
1095                                 (unsigned long) &cmd))
1096                         lbs_pr_alert("CMD_FUNC_SHUTDOWN cmd failed\n");
1097         }
1098
1099         card->priv->surpriseremoved = 1;
1100
1101         lbs_deb_sdio("call remove card\n");
1102         lbs_stop_card(card->priv);
1103         lbs_remove_card(card->priv);
1104
1105         flush_workqueue(card->workqueue);
1106         destroy_workqueue(card->workqueue);
1107
1108         sdio_claim_host(func);
1109         sdio_release_irq(func);
1110         sdio_disable_func(func);
1111         sdio_release_host(func);
1112
1113         while (card->packets) {
1114                 packet = card->packets;
1115                 card->packets = card->packets->next;
1116                 kfree(packet);
1117         }
1118
1119         kfree(card);
1120
1121         lbs_deb_leave(LBS_DEB_SDIO);
1122 }
1123
1124 static struct sdio_driver if_sdio_driver = {
1125         .name           = "libertas_sdio",
1126         .id_table       = if_sdio_ids,
1127         .probe          = if_sdio_probe,
1128         .remove         = if_sdio_remove,
1129 };
1130
1131 /*******************************************************************/
1132 /* Module functions                                                */
1133 /*******************************************************************/
1134
1135 static int __init if_sdio_init_module(void)
1136 {
1137         int ret = 0;
1138
1139         lbs_deb_enter(LBS_DEB_SDIO);
1140
1141         printk(KERN_INFO "libertas_sdio: Libertas SDIO driver\n");
1142         printk(KERN_INFO "libertas_sdio: Copyright Pierre Ossman\n");
1143
1144         ret = sdio_register_driver(&if_sdio_driver);
1145
1146         /* Clear the flag in case user removes the card. */
1147         user_rmmod = 0;
1148
1149         lbs_deb_leave_args(LBS_DEB_SDIO, "ret %d", ret);
1150
1151         return ret;
1152 }
1153
1154 static void __exit if_sdio_exit_module(void)
1155 {
1156         lbs_deb_enter(LBS_DEB_SDIO);
1157
1158         /* Set the flag as user is removing this module. */
1159         user_rmmod = 1;
1160
1161         sdio_unregister_driver(&if_sdio_driver);
1162
1163         lbs_deb_leave(LBS_DEB_SDIO);
1164 }
1165
1166 module_init(if_sdio_init_module);
1167 module_exit(if_sdio_exit_module);
1168
1169 MODULE_DESCRIPTION("Libertas SDIO WLAN Driver");
1170 MODULE_AUTHOR("Pierre Ossman");
1171 MODULE_LICENSE("GPL");