drivers/net/wireless/libertas/if_spi.c

   1 /*
   2  *      linux/drivers/net/wireless/libertas/if_spi.c
   3  *
   4  *      Driver for Marvell SPI WLAN cards.
   5  *
   6  *      Copyright 2008 Analog Devices Inc.
   7  *
   8  *      Authors:
   9  *      Andrey Yurovsky <andrey@cozybit.com>
  10  *      Colin McCabe <colin@cozybit.com>
  11  *
  12  *      Inspired by if_sdio.c, Copyright 2007-2008 Pierre Ossman
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2 of the License, or
  17  * (at your option) any later version.
  18  */
  19
  20 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  21
  22 #include <linux/hardirq.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/module.h>
  25 #include <linux/firmware.h>
  26 #include <linux/jiffies.h>
  27 #include <linux/list.h>
  28 #include <linux/netdevice.h>
  29 #include <linux/slab.h>
  30 #include <linux/spi/libertas_spi.h>
  31 #include <linux/spi/spi.h>
  32
  33 #include "host.h"
  34 #include "decl.h"
  35 #include "defs.h"
  36 #include "dev.h"
  37 #include "if_spi.h"
  38
  39 struct if_spi_packet {
  40         struct list_head                list;
  41         u16                             blen;
  42         u8                              buffer[0] __attribute__((aligned(4)));
  43 };
  44
  45 struct if_spi_card {
  46         struct spi_device               *spi;
  47         struct lbs_private              *priv;
  48         struct libertas_spi_platform_data *pdata;
  49
  50         /* The card ID and card revision, as reported by the hardware. */
  51         u16                             card_id;
  52         u8                              card_rev;
  53
  54         /* The last time that we initiated an SPU operation */
  55         unsigned long                   prev_xfer_time;
  56
  57         int                             use_dummy_writes;
  58         unsigned long                   spu_port_delay;
  59         unsigned long                   spu_reg_delay;
  60
  61         /* Handles all SPI communication (except for FW load) */
  62         struct workqueue_struct         *workqueue;
  63         struct work_struct              packet_work;
  64         struct work_struct              resume_work;
  65
  66         u8                              cmd_buffer[IF_SPI_CMD_BUF_SIZE];
  67
  68         /* A buffer of incoming packets from libertas core.
  69          * Since we can't sleep in hw_host_to_card, we have to buffer
  70          * them. */
  71         struct list_head                cmd_packet_list;
  72         struct list_head                data_packet_list;
  73
  74         /* Protects cmd_packet_list and data_packet_list */
  75         spinlock_t                      buffer_lock;
  76
  77         /* True is card suspended */
  78         u8                              suspended;
  79 };
  80
  81 static void free_if_spi_card(struct if_spi_card *card)
  82 {
  83         struct list_head *cursor, *next;
  84         struct if_spi_packet *packet;
  85
  86         list_for_each_safe(cursor, next, &card->cmd_packet_list) {
  87                 packet = container_of(cursor, struct if_spi_packet, list);
  88                 list_del(&packet->list);
  89                 kfree(packet);
  90         }
  91         list_for_each_safe(cursor, next, &card->data_packet_list) {
  92                 packet = container_of(cursor, struct if_spi_packet, list);
  93                 list_del(&packet->list);
  94                 kfree(packet);
  95         }
  96         spi_set_drvdata(card->spi, NULL);
  97         kfree(card);
  98 }
  99
 100 #define MODEL_8385      0x04
 101 #define MODEL_8686      0x0b
 102 #define MODEL_8688      0x10
 103
 104 static const struct lbs_fw_table fw_table[] = {
 105         { MODEL_8385, "libertas/gspi8385_helper.bin", "libertas/gspi8385.bin" },
 106         { MODEL_8385, "libertas/gspi8385_hlp.bin", "libertas/gspi8385.bin" },
 107         { MODEL_8686, "libertas/gspi8686_v9_helper.bin", "libertas/gspi8686_v9.bin" },
 108         { MODEL_8686, "libertas/gspi8686_hlp.bin", "libertas/gspi8686.bin" },
 109         { MODEL_8688, "libertas/gspi8688_helper.bin", "libertas/gspi8688.bin" },
 110         { 0, NULL, NULL }
 111 };
 112 MODULE_FIRMWARE("libertas/gspi8385_helper.bin");
 113 MODULE_FIRMWARE("libertas/gspi8385_hlp.bin");
 114 MODULE_FIRMWARE("libertas/gspi8385.bin");
 115 MODULE_FIRMWARE("libertas/gspi8686_v9_helper.bin");
 116 MODULE_FIRMWARE("libertas/gspi8686_v9.bin");
 117 MODULE_FIRMWARE("libertas/gspi8686_hlp.bin");
 118 MODULE_FIRMWARE("libertas/gspi8686.bin");
 119 MODULE_FIRMWARE("libertas/gspi8688_helper.bin");
 120 MODULE_FIRMWARE("libertas/gspi8688.bin");
 121
 122
 123 /*
 124  * SPI Interface Unit Routines
 125  *
 126  * The SPU sits between the host and the WLAN module.
 127  * All communication with the firmware is through SPU transactions.
 128  *
 129  * First we have to put a SPU register name on the bus. Then we can
 130  * either read from or write to that register.
 131  *
 132  */
 133
 134 static void spu_transaction_init(struct if_spi_card *card)
 135 {
 136         if (!time_after(jiffies, card->prev_xfer_time + 1)) {
 137                 /* Unfortunately, the SPU requires a delay between successive
 138                  * transactions. If our last transaction was more than a jiffy
 139                  * ago, we have obviously already delayed enough.
 140                  * If not, we have to busy-wait to be on the safe side. */
 141                 ndelay(400);
 142         }
 143 }
 144
 145 static void spu_transaction_finish(struct if_spi_card *card)
 146 {
 147         card->prev_xfer_time = jiffies;
 148 }
 149
 150 /*
 151  * Write out a byte buffer to an SPI register,
 152  * using a series of 16-bit transfers.
 153  */
 154 static int spu_write(struct if_spi_card *card, u16 reg, const u8 *buf, int len)
 155 {
 156         int err = 0;
 157         __le16 reg_out = cpu_to_le16(reg | IF_SPI_WRITE_OPERATION_MASK);
 158         struct spi_message m;
 159         struct spi_transfer reg_trans;
 160         struct spi_transfer data_trans;
 161
 162         spi_message_init(&m);
 163         memset(&reg_trans, 0, sizeof(reg_trans));
 164         memset(&data_trans, 0, sizeof(data_trans));
 165
 166         /* You must give an even number of bytes to the SPU, even if it
 167          * doesn't care about the last one.  */
 168         BUG_ON(len & 0x1);
 169
 170         spu_transaction_init(card);
 171
 172         /* write SPU register index */
 173         reg_trans.tx_buf = &reg_out;
 174         reg_trans.len = sizeof(reg_out);
 175
 176         data_trans.tx_buf = buf;
 177         data_trans.len = len;
 178
 179         spi_message_add_tail(&reg_trans, &m);
 180         spi_message_add_tail(&data_trans, &m);
 181
 182         err = spi_sync(card->spi, &m);
 183         spu_transaction_finish(card);
 184         return err;
 185 }
 186
 187 static inline int spu_write_u16(struct if_spi_card *card, u16 reg, u16 val)
 188 {
 189         __le16 buff;
 190
 191         buff = cpu_to_le16(val);
 192         return spu_write(card, reg, (u8 *)&buff, sizeof(u16));
 193 }
 194
 195 static inline int spu_reg_is_port_reg(u16 reg)
 196 {
 197         switch (reg) {
 198         case IF_SPI_IO_RDWRPORT_REG:
 199         case IF_SPI_CMD_RDWRPORT_REG:
 200         case IF_SPI_DATA_RDWRPORT_REG:
 201                 return 1;
 202         default:
 203                 return 0;
 204         }
 205 }
 206
 207 static int spu_read(struct if_spi_card *card, u16 reg, u8 *buf, int len)
 208 {
 209         unsigned int delay;
 210         int err = 0;
 211         __le16 reg_out = cpu_to_le16(reg | IF_SPI_READ_OPERATION_MASK);
 212         struct spi_message m;
 213         struct spi_transfer reg_trans;
 214         struct spi_transfer dummy_trans;
 215         struct spi_transfer data_trans;
 216
 217         /*
 218          * You must take an even number of bytes from the SPU, even if you
 219          * don't care about the last one.
 220          */
 221         BUG_ON(len & 0x1);
 222
 223         spu_transaction_init(card);
 224
 225         spi_message_init(&m);
 226         memset(&reg_trans, 0, sizeof(reg_trans));
 227         memset(&dummy_trans, 0, sizeof(dummy_trans));
 228         memset(&data_trans, 0, sizeof(data_trans));
 229
 230         /* write SPU register index */
 231         reg_trans.tx_buf = &reg_out;
 232         reg_trans.len = sizeof(reg_out);
 233         spi_message_add_tail(&reg_trans, &m);
 234
 235         delay = spu_reg_is_port_reg(reg) ? card->spu_port_delay :
 236                                                 card->spu_reg_delay;
 237         if (card->use_dummy_writes) {
 238                 /* Clock in dummy cycles while the SPU fills the FIFO */
 239                 dummy_trans.len = delay / 8;
 240                 spi_message_add_tail(&dummy_trans, &m);
 241         } else {
 242                 /* Busy-wait while the SPU fills the FIFO */
 243                 reg_trans.delay_usecs =
 244                         DIV_ROUND_UP((100 + (delay * 10)), 1000);
 245         }
 246
 247         /* read in data */
 248         data_trans.rx_buf = buf;
 249         data_trans.len = len;
 250         spi_message_add_tail(&data_trans, &m);
 251
 252         err = spi_sync(card->spi, &m);
 253         spu_transaction_finish(card);
 254         return err;
 255 }
 256
 257 /* Read 16 bits from an SPI register */
 258 static inline int spu_read_u16(struct if_spi_card *card, u16 reg, u16 *val)
 259 {
 260         __le16 buf;
 261         int ret;
 262
 263         ret = spu_read(card, reg, (u8 *)&buf, sizeof(buf));
 264         if (ret == 0)
 265                 *val = le16_to_cpup(&buf);
 266         return ret;
 267 }
 268
 269 /*
 270  * Read 32 bits from an SPI register.
 271  * The low 16 bits are read first.
 272  */
 273 static int spu_read_u32(struct if_spi_card *card, u16 reg, u32 *val)
 274 {
 275         __le32 buf;
 276         int err;
 277
 278         err = spu_read(card, reg, (u8 *)&buf, sizeof(buf));
 279         if (!err)
 280                 *val = le32_to_cpup(&buf);
 281         return err;
 282 }
 283
 284 /*
 285  * Keep reading 16 bits from an SPI register until you get the correct result.
 286  *
 287  * If mask = 0, the correct result is any non-zero number.
 288  * If mask != 0, the correct result is any number where
 289  * number & target_mask == target
 290  *
 291  * Returns -ETIMEDOUT if a second passes without the correct result.
 292  */
 293 static int spu_wait_for_u16(struct if_spi_card *card, u16 reg,
 294                         u16 target_mask, u16 target)
 295 {
 296         int err;
 297         unsigned long timeout = jiffies + 5*HZ;
 298         while (1) {
 299                 u16 val;
 300                 err = spu_read_u16(card, reg, &val);
 301                 if (err)
 302                         return err;
 303                 if (target_mask) {
 304                         if ((val & target_mask) == target)
 305                                 return 0;
 306                 } else {
 307                         if (val)
 308                                 return 0;
 309                 }
 310                 udelay(100);
 311                 if (time_after(jiffies, timeout)) {
 312                         pr_err("%s: timeout with val=%02x, target_mask=%02x, target=%02x\n",
 313                                __func__, val, target_mask, target);
 314                         return -ETIMEDOUT;
 315                 }
 316         }
 317 }
 318
 319 /*
 320  * Read 16 bits from an SPI register until you receive a specific value.
 321  * Returns -ETIMEDOUT if a 4 tries pass without success.
 322  */
 323 static int spu_wait_for_u32(struct if_spi_card *card, u32 reg, u32 target)
 324 {
 325         int err, try;
 326         for (try = 0; try < 4; ++try) {
 327                 u32 val = 0;
 328                 err = spu_read_u32(card, reg, &val);
 329                 if (err)
 330                         return err;
 331                 if (val == target)
 332                         return 0;
 333                 mdelay(100);
 334         }
 335         return -ETIMEDOUT;
 336 }
 337
 338 static int spu_set_interrupt_mode(struct if_spi_card *card,
 339                            int suppress_host_int,
 340                            int auto_int)
 341 {
 342         int err = 0;
 343
 344         /*
 345          * We can suppress a host interrupt by clearing the appropriate
 346          * bit in the "host interrupt status mask" register
 347          */
 348         if (suppress_host_int) {
 349                 err = spu_write_u16(card, IF_SPI_HOST_INT_STATUS_MASK_REG, 0);
 350                 if (err)
 351                         return err;
 352         } else {
 353                 err = spu_write_u16(card, IF_SPI_HOST_INT_STATUS_MASK_REG,
 354                               IF_SPI_HISM_TX_DOWNLOAD_RDY |
 355                               IF_SPI_HISM_RX_UPLOAD_RDY |
 356                               IF_SPI_HISM_CMD_DOWNLOAD_RDY |
 357                               IF_SPI_HISM_CARDEVENT |
 358                               IF_SPI_HISM_CMD_UPLOAD_RDY);
 359                 if (err)
 360                         return err;
 361         }
 362
 363         /*
 364          * If auto-interrupts are on, the completion of certain transactions
 365          * will trigger an interrupt automatically. If auto-interrupts
 366          * are off, we need to set the "Card Interrupt Cause" register to
 367          * trigger a card interrupt.
 368          */
 369         if (auto_int) {
 370                 err = spu_write_u16(card, IF_SPI_HOST_INT_CTRL_REG,
 371                                 IF_SPI_HICT_TX_DOWNLOAD_OVER_AUTO |
 372                                 IF_SPI_HICT_RX_UPLOAD_OVER_AUTO |
 373                                 IF_SPI_HICT_CMD_DOWNLOAD_OVER_AUTO |
 374                                 IF_SPI_HICT_CMD_UPLOAD_OVER_AUTO);
 375                 if (err)
 376                         return err;
 377         } else {
 378                 err = spu_write_u16(card, IF_SPI_HOST_INT_STATUS_MASK_REG, 0);
 379                 if (err)
 380                         return err;
 381         }
 382         return err;
 383 }
 384
 385 static int spu_get_chip_revision(struct if_spi_card *card,
 386                                   u16 *card_id, u8 *card_rev)
 387 {
 388         int err = 0;
 389         u32 dev_ctrl;
 390         err = spu_read_u32(card, IF_SPI_DEVICEID_CTRL_REG, &dev_ctrl);
 391         if (err)
 392                 return err;
 393         *card_id = IF_SPI_DEVICEID_CTRL_REG_TO_CARD_ID(dev_ctrl);
 394         *card_rev = IF_SPI_DEVICEID_CTRL_REG_TO_CARD_REV(dev_ctrl);
 395         return err;
 396 }
 397
 398 static int spu_set_bus_mode(struct if_spi_card *card, u16 mode)
 399 {
 400         int err = 0;
 401         u16 rval;
 402         /* set bus mode */
 403         err = spu_write_u16(card, IF_SPI_SPU_BUS_MODE_REG, mode);
 404         if (err)
 405                 return err;
 406         /* Check that we were able to read back what we just wrote. */
 407         err = spu_read_u16(card, IF_SPI_SPU_BUS_MODE_REG, &rval);
 408         if (err)
 409                 return err;
 410         if ((rval & 0xF) != mode) {
 411                 pr_err("Can't read bus mode register\n");
 412                 return -EIO;
 413         }
 414         return 0;
 415 }
 416
 417 static int spu_init(struct if_spi_card *card, int use_dummy_writes)
 418 {
 419         int err = 0;
 420         u32 delay;
 421
 422         /*
 423          * We have to start up in timed delay mode so that we can safely
 424          * read the Delay Read Register.
 425          */
 426         card->use_dummy_writes = 0;
 427         err = spu_set_bus_mode(card,
 428                                 IF_SPI_BUS_MODE_SPI_CLOCK_PHASE_RISING |
 429                                 IF_SPI_BUS_MODE_DELAY_METHOD_TIMED |
 430                                 IF_SPI_BUS_MODE_16_BIT_ADDRESS_16_BIT_DATA);
 431         if (err)
 432                 return err;
 433         card->spu_port_delay = 1000;
 434         card->spu_reg_delay = 1000;
 435         err = spu_read_u32(card, IF_SPI_DELAY_READ_REG, &delay);
 436         if (err)
 437                 return err;
 438         card->spu_port_delay = delay & 0x0000ffff;
 439         card->spu_reg_delay = (delay & 0xffff0000) >> 16;
 440
 441         /* If dummy clock delay mode has been requested, switch to it now */
 442         if (use_dummy_writes) {
 443                 card->use_dummy_writes = 1;
 444                 err = spu_set_bus_mode(card,
 445                                 IF_SPI_BUS_MODE_SPI_CLOCK_PHASE_RISING |
 446                                 IF_SPI_BUS_MODE_DELAY_METHOD_DUMMY_CLOCK |
 447                                 IF_SPI_BUS_MODE_16_BIT_ADDRESS_16_BIT_DATA);
 448                 if (err)
 449                         return err;
 450         }
 451
 452         lbs_deb_spi("Initialized SPU unit. "
 453                     "spu_port_delay=0x%04lx, spu_reg_delay=0x%04lx\n",
 454                     card->spu_port_delay, card->spu_reg_delay);
 455         return err;
 456 }
 457
 458 /*
 459  * Firmware Loading
 460  */
 461
 462 static int if_spi_prog_helper_firmware(struct if_spi_card *card,
 463                                         const struct firmware *firmware)
 464 {
 465         int err = 0;
 466         int bytes_remaining;
 467         const u8 *fw;
 468         u8 temp[HELPER_FW_LOAD_CHUNK_SZ];
 469
 470         lbs_deb_enter(LBS_DEB_SPI);
 471
 472         err = spu_set_interrupt_mode(card, 1, 0);
 473         if (err)
 474                 goto out;
 475
 476         bytes_remaining = firmware->size;
 477         fw = firmware->data;
 478
 479         /* Load helper firmware image */
 480         while (bytes_remaining > 0) {
 481                 /*
 482                  * Scratch pad 1 should contain the number of bytes we
 483                  * want to download to the firmware
 484                  */
 485                 err = spu_write_u16(card, IF_SPI_SCRATCH_1_REG,
 486                                         HELPER_FW_LOAD_CHUNK_SZ);
 487                 if (err)
 488                         goto out;
 489
 490                 err = spu_wait_for_u16(card, IF_SPI_HOST_INT_STATUS_REG,
 491                                         IF_SPI_HIST_CMD_DOWNLOAD_RDY,
 492                                         IF_SPI_HIST_CMD_DOWNLOAD_RDY);
 493                 if (err)
 494                         goto out;
 495
 496                 /*
 497                  * Feed the data into the command read/write port reg
 498                  * in chunks of 64 bytes
 499                  */
 500                 memset(temp, 0, sizeof(temp));
 501                 memcpy(temp, fw,
 502                        min(bytes_remaining, HELPER_FW_LOAD_CHUNK_SZ));
 503                 mdelay(10);
 504                 err = spu_write(card, IF_SPI_CMD_RDWRPORT_REG,
 505                                         temp, HELPER_FW_LOAD_CHUNK_SZ);
 506                 if (err)
 507                         goto out;
 508
 509                 /* Interrupt the boot code */
 510                 err = spu_write_u16(card, IF_SPI_HOST_INT_STATUS_REG, 0);
 511                 if (err)
 512                         goto out;
 513                 err = spu_write_u16(card, IF_SPI_CARD_INT_CAUSE_REG,
 514                                        IF_SPI_CIC_CMD_DOWNLOAD_OVER);
 515                 if (err)
 516                         goto out;
 517                 bytes_remaining -= HELPER_FW_LOAD_CHUNK_SZ;
 518                 fw += HELPER_FW_LOAD_CHUNK_SZ;
 519         }
 520
 521         /*
 522          * Once the helper / single stage firmware download is complete,
 523          * write 0 to scratch pad 1 and interrupt the
 524          * bootloader. This completes the helper download.
 525          */
 526         err = spu_write_u16(card, IF_SPI_SCRATCH_1_REG, FIRMWARE_DNLD_OK);
 527         if (err)
 528                 goto out;
 529         err = spu_write_u16(card, IF_SPI_HOST_INT_STATUS_REG, 0);
 530         if (err)
 531                 goto out;
 532         err = spu_write_u16(card, IF_SPI_CARD_INT_CAUSE_REG,
 533                                 IF_SPI_CIC_CMD_DOWNLOAD_OVER);
 534 out:
 535         if (err)
 536                 pr_err("failed to load helper firmware (err=%d)\n", err);
 537         lbs_deb_leave_args(LBS_DEB_SPI, "err %d", err);
 538         return err;
 539 }
 540
 541 /*
 542  * Returns the length of the next packet the firmware expects us to send.
 543  * Sets crc_err if the previous transfer had a CRC error.
 544  */
 545 static int if_spi_prog_main_firmware_check_len(struct if_spi_card *card,
 546                                                 int *crc_err)
 547 {
 548         u16 len;
 549         int err = 0;
 550
 551         /*
 552          * wait until the host interrupt status register indicates
 553          * that we are ready to download
 554          */
 555         err = spu_wait_for_u16(card, IF_SPI_HOST_INT_STATUS_REG,
 556                                 IF_SPI_HIST_CMD_DOWNLOAD_RDY,
 557                                 IF_SPI_HIST_CMD_DOWNLOAD_RDY);
 558         if (err) {
 559                 pr_err("timed out waiting for host_int_status\n");
 560                 return err;
 561         }
 562
 563         /* Ask the device how many bytes of firmware it wants. */
 564         err = spu_read_u16(card, IF_SPI_SCRATCH_1_REG, &len);
 565         if (err)
 566                 return err;
 567
 568         if (len > IF_SPI_CMD_BUF_SIZE) {
 569                 pr_err("firmware load device requested a larger transfer than we are prepared to handle (len = %d)\n",
 570                        len);
 571                 return -EIO;
 572         }
 573         if (len & 0x1) {
 574                 lbs_deb_spi("%s: crc error\n", __func__);
 575                 len &= ~0x1;
 576                 *crc_err = 1;
 577         } else
 578                 *crc_err = 0;
 579
 580         return len;
 581 }
 582
 583 static int if_spi_prog_main_firmware(struct if_spi_card *card,
 584                                         const struct firmware *firmware)
 585 {
 586         struct lbs_private *priv = card->priv;
 587         int len, prev_len;
 588         int bytes, crc_err = 0, err = 0;
 589         const u8 *fw;
 590         u16 num_crc_errs;
 591
 592         lbs_deb_enter(LBS_DEB_SPI);
 593
 594         err = spu_set_interrupt_mode(card, 1, 0);
 595         if (err)
 596                 goto out;
 597
 598         err = spu_wait_for_u16(card, IF_SPI_SCRATCH_1_REG, 0, 0);
 599         if (err) {
 600                 netdev_err(priv->dev,
 601                            "%s: timed out waiting for initial scratch reg = 0\n",
 602                            __func__);
 603                 goto out;
 604         }
 605
 606         num_crc_errs = 0;
 607         prev_len = 0;
 608         bytes = firmware->size;
 609         fw = firmware->data;
 610         while ((len = if_spi_prog_main_firmware_check_len(card, &crc_err))) {
 611                 if (len < 0) {
 612                         err = len;
 613                         goto out;
 614                 }
 615                 if (bytes < 0) {
 616                         /*
 617                          * If there are no more bytes left, we would normally
 618                          * expect to have terminated with len = 0
 619                          */
 620                         netdev_err(priv->dev,
 621                                    "Firmware load wants more bytes than we have to offer.\n");
 622                         break;
 623                 }
 624                 if (crc_err) {
 625                         /* Previous transfer failed. */
 626                         if (++num_crc_errs > MAX_MAIN_FW_LOAD_CRC_ERR) {
 627                                 pr_err("Too many CRC errors encountered in firmware load.\n");
 628                                 err = -EIO;
 629                                 goto out;
 630                         }
 631                 } else {
 632                         /* Previous transfer succeeded. Advance counters. */
 633                         bytes -= prev_len;
 634                         fw += prev_len;
 635                 }
 636                 if (bytes < len) {
 637                         memset(card->cmd_buffer, 0, len);
 638                         memcpy(card->cmd_buffer, fw, bytes);
 639                 } else
 640                         memcpy(card->cmd_buffer, fw, len);
 641
 642                 err = spu_write_u16(card, IF_SPI_HOST_INT_STATUS_REG, 0);
 643                 if (err)
 644                         goto out;
 645                 err = spu_write(card, IF_SPI_CMD_RDWRPORT_REG,
 646                                 card->cmd_buffer, len);
 647                 if (err)
 648                         goto out;
 649                 err = spu_write_u16(card, IF_SPI_CARD_INT_CAUSE_REG ,
 650                                         IF_SPI_CIC_CMD_DOWNLOAD_OVER);
 651                 if (err)
 652                         goto out;
 653                 prev_len = len;
 654         }
 655         if (bytes > prev_len) {
 656                 pr_err("firmware load wants fewer bytes than we have to offer\n");
 657         }
 658
 659         /* Confirm firmware download */
 660         err = spu_wait_for_u32(card, IF_SPI_SCRATCH_4_REG,
 661                                         SUCCESSFUL_FW_DOWNLOAD_MAGIC);
 662         if (err) {
 663                 pr_err("failed to confirm the firmware download\n");
 664                 goto out;
 665         }
 666
 667 out:
 668         if (err)
 669                 pr_err("failed to load firmware (err=%d)\n", err);
 670         lbs_deb_leave_args(LBS_DEB_SPI, "err %d", err);
 671         return err;
 672 }
 673
 674 /*
 675  * SPI Transfer Thread
 676  *
 677  * The SPI worker handles all SPI transfers, so there is no need for a lock.
 678  */
 679
 680 /* Move a command from the card to the host */
 681 static int if_spi_c2h_cmd(struct if_spi_card *card)
 682 {
 683         struct lbs_private *priv = card->priv;
 684         unsigned long flags;
 685         int err = 0;
 686         u16 len;
 687         u8 i;
 688
 689         /*
 690          * We need a buffer big enough to handle whatever people send to
 691          * hw_host_to_card
 692          */
 693         BUILD_BUG_ON(IF_SPI_CMD_BUF_SIZE < LBS_CMD_BUFFER_SIZE);
 694         BUILD_BUG_ON(IF_SPI_CMD_BUF_SIZE < LBS_UPLD_SIZE);
 695
 696         /*
 697          * It's just annoying if the buffer size isn't a multiple of 4, because
 698          * then we might have len < IF_SPI_CMD_BUF_SIZE but
 699          * ALIGN(len, 4) > IF_SPI_CMD_BUF_SIZE
 700          */
 701         BUILD_BUG_ON(IF_SPI_CMD_BUF_SIZE % 4 != 0);
 702
 703         lbs_deb_enter(LBS_DEB_SPI);
 704
 705         /* How many bytes are there to read? */
 706         err = spu_read_u16(card, IF_SPI_SCRATCH_2_REG, &len);
 707         if (err)
 708                 goto out;
 709         if (!len) {
 710                 netdev_err(priv->dev, "%s: error: card has no data for host\n",
 711                            __func__);
 712                 err = -EINVAL;
 713                 goto out;
 714         } else if (len > IF_SPI_CMD_BUF_SIZE) {
 715                 netdev_err(priv->dev,
 716                            "%s: error: response packet too large: %d bytes, but maximum is %d\n",
 717                            __func__, len, IF_SPI_CMD_BUF_SIZE);
 718                 err = -EINVAL;
 719                 goto out;
 720         }
 721
 722         /* Read the data from the WLAN module into our command buffer */
 723         err = spu_read(card, IF_SPI_CMD_RDWRPORT_REG,
 724                                 card->cmd_buffer, ALIGN(len, 4));
 725         if (err)
 726                 goto out;
 727
 728         spin_lock_irqsave(&priv->driver_lock, flags);
 729         i = (priv->resp_idx == 0) ? 1 : 0;
 730         BUG_ON(priv->resp_len[i]);
 731         priv->resp_len[i] = len;
 732         memcpy(priv->resp_buf[i], card->cmd_buffer, len);
 733         lbs_notify_command_response(priv, i);
 734         spin_unlock_irqrestore(&priv->driver_lock, flags);
 735
 736 out:
 737         if (err)
 738                 netdev_err(priv->dev, "%s: err=%d\n", __func__, err);
 739         lbs_deb_leave(LBS_DEB_SPI);
 740         return err;
 741 }
 742
 743 /* Move data from the card to the host */
 744 static int if_spi_c2h_data(struct if_spi_card *card)
 745 {
 746         struct lbs_private *priv = card->priv;
 747         struct sk_buff *skb;
 748         char *data;
 749         u16 len;
 750         int err = 0;
 751
 752         lbs_deb_enter(LBS_DEB_SPI);
 753
 754         /* How many bytes are there to read? */
 755         err = spu_read_u16(card, IF_SPI_SCRATCH_1_REG, &len);
 756         if (err)
 757                 goto out;
 758         if (!len) {
 759                 netdev_err(priv->dev, "%s: error: card has no data for host\n",
 760                            __func__);
 761                 err = -EINVAL;
 762                 goto out;
 763         } else if (len > MRVDRV_ETH_RX_PACKET_BUFFER_SIZE) {
 764                 netdev_err(priv->dev,
 765                            "%s: error: card has %d bytes of data, but our maximum skb size is %zu\n",
 766                            __func__, len, MRVDRV_ETH_RX_PACKET_BUFFER_SIZE);
 767                 err = -EINVAL;
 768                 goto out;
 769         }
 770
 771         /* TODO: should we allocate a smaller skb if we have less data? */
 772         skb = dev_alloc_skb(MRVDRV_ETH_RX_PACKET_BUFFER_SIZE);
 773         if (!skb) {
 774                 err = -ENOBUFS;
 775                 goto out;
 776         }
 777         skb_reserve(skb, IPFIELD_ALIGN_OFFSET);
 778         data = skb_put(skb, len);
 779
 780         /* Read the data from the WLAN module into our skb... */
 781         err = spu_read(card, IF_SPI_DATA_RDWRPORT_REG, data, ALIGN(len, 4));
 782         if (err)
 783                 goto free_skb;
 784
 785         /* pass the SKB to libertas */
 786         err = lbs_process_rxed_packet(card->priv, skb);
 787         if (err)
 788                 goto free_skb;
 789
 790         /* success */
 791         goto out;
 792
 793 free_skb:
 794         dev_kfree_skb(skb);
 795 out:
 796         if (err)
 797                 netdev_err(priv->dev, "%s: err=%d\n", __func__, err);
 798         lbs_deb_leave(LBS_DEB_SPI);
 799         return err;
 800 }
 801
 802 /* Move data or a command from the host to the card. */
 803 static void if_spi_h2c(struct if_spi_card *card,
 804                         struct if_spi_packet *packet, int type)
 805 {
 806         struct lbs_private *priv = card->priv;
 807         int err = 0;
 808         u16 int_type, port_reg;
 809
 810         switch (type) {
 811         case MVMS_DAT:
 812                 int_type = IF_SPI_CIC_TX_DOWNLOAD_OVER;
 813                 port_reg = IF_SPI_DATA_RDWRPORT_REG;
 814                 break;
 815         case MVMS_CMD:
 816                 int_type = IF_SPI_CIC_CMD_DOWNLOAD_OVER;
 817                 port_reg = IF_SPI_CMD_RDWRPORT_REG;
 818                 break;
 819         default:
 820                 netdev_err(priv->dev, "can't transfer buffer of type %d\n",
 821                            type);
 822                 err = -EINVAL;
 823                 goto out;
 824         }
 825
 826         /* Write the data to the card */
 827         err = spu_write(card, port_reg, packet->buffer, packet->blen);
 828         if (err)
 829                 goto out;
 830
 831 out:
 832         kfree(packet);
 833
 834         if (err)
 835                 netdev_err(priv->dev, "%s: error %d\n", __func__, err);
 836 }
 837
 838 /* Inform the host about a card event */
 839 static void if_spi_e2h(struct if_spi_card *card)
 840 {
 841         int err = 0;
 842         u32 cause;
 843         struct lbs_private *priv = card->priv;
 844
 845         err = spu_read_u32(card, IF_SPI_SCRATCH_3_REG, &cause);
 846         if (err)
 847                 goto out;
 848
 849         /* re-enable the card event interrupt */
 850         spu_write_u16(card, IF_SPI_HOST_INT_STATUS_REG,
 851                         ~IF_SPI_HICU_CARD_EVENT);
 852
 853         /* generate a card interrupt */
 854         spu_write_u16(card, IF_SPI_CARD_INT_CAUSE_REG, IF_SPI_CIC_HOST_EVENT);
 855
 856         lbs_queue_event(priv, cause & 0xff);
 857 out:
 858         if (err)
 859                 netdev_err(priv->dev, "%s: error %d\n", __func__, err);
 860 }
 861
 862 static void if_spi_host_to_card_worker(struct work_struct *work)
 863 {
 864         int err;
 865         struct if_spi_card *card;
 866         u16 hiStatus;
 867         unsigned long flags;
 868         struct if_spi_packet *packet;
 869         struct lbs_private *priv;
 870
 871         card = container_of(work, struct if_spi_card, packet_work);
 872         priv = card->priv;
 873
 874         lbs_deb_enter(LBS_DEB_SPI);
 875
 876         /*
 877          * Read the host interrupt status register to see what we
 878          * can do.
 879          */
 880         err = spu_read_u16(card, IF_SPI_HOST_INT_STATUS_REG,
 881                                 &hiStatus);
 882         if (err) {
 883                 netdev_err(priv->dev, "I/O error\n");
 884                 goto err;
 885         }
 886
 887         if (hiStatus & IF_SPI_HIST_CMD_UPLOAD_RDY) {
 888                 err = if_spi_c2h_cmd(card);
 889                 if (err)
 890                         goto err;
 891         }
 892         if (hiStatus & IF_SPI_HIST_RX_UPLOAD_RDY) {
 893                 err = if_spi_c2h_data(card);
 894                 if (err)
 895                         goto err;
 896         }
 897
 898         /*
 899          * workaround: in PS mode, the card does not set the Command
 900          * Download Ready bit, but it sets TX Download Ready.
 901          */
 902         if (hiStatus & IF_SPI_HIST_CMD_DOWNLOAD_RDY ||
 903            (card->priv->psstate != PS_STATE_FULL_POWER &&
 904             (hiStatus & IF_SPI_HIST_TX_DOWNLOAD_RDY))) {
 905                 /*
 906                  * This means two things. First of all,
 907                  * if there was a previous command sent, the card has
 908                  * successfully received it.
 909                  * Secondly, it is now ready to download another
 910                  * command.
 911                  */
 912                 lbs_host_to_card_done(card->priv);
 913
 914                 /* Do we have any command packets from the host to send? */
 915                 packet = NULL;
 916                 spin_lock_irqsave(&card->buffer_lock, flags);
 917                 if (!list_empty(&card->cmd_packet_list)) {
 918                         packet = (struct if_spi_packet *)(card->
 919                                         cmd_packet_list.next);
 920                         list_del(&packet->list);
 921                 }
 922                 spin_unlock_irqrestore(&card->buffer_lock, flags);
 923
 924                 if (packet)
 925                         if_spi_h2c(card, packet, MVMS_CMD);
 926         }
 927         if (hiStatus & IF_SPI_HIST_TX_DOWNLOAD_RDY) {
 928                 /* Do we have any data packets from the host to send? */
 929                 packet = NULL;
 930                 spin_lock_irqsave(&card->buffer_lock, flags);
 931                 if (!list_empty(&card->data_packet_list)) {
 932                         packet = (struct if_spi_packet *)(card->
 933                                         data_packet_list.next);
 934                         list_del(&packet->list);
 935                 }
 936                 spin_unlock_irqrestore(&card->buffer_lock, flags);
 937
 938                 if (packet)
 939                         if_spi_h2c(card, packet, MVMS_DAT);
 940         }
 941         if (hiStatus & IF_SPI_HIST_CARD_EVENT)
 942                 if_spi_e2h(card);
 943
 944 err:
 945         if (err)
 946                 netdev_err(priv->dev, "%s: got error %d\n", __func__, err);
 947
 948         lbs_deb_leave(LBS_DEB_SPI);
 949 }
 950
 951 /*
 952  * Host to Card
 953  *
 954  * Called from Libertas to transfer some data to the WLAN device
 955  * We can't sleep here.
 956  */
 957 static int if_spi_host_to_card(struct lbs_private *priv,
 958                                 u8 type, u8 *buf, u16 nb)
 959 {
 960         int err = 0;
 961         unsigned long flags;
 962         struct if_spi_card *card = priv->card;
 963         struct if_spi_packet *packet;
 964         u16 blen;
 965
 966         lbs_deb_enter_args(LBS_DEB_SPI, "type %d, bytes %d", type, nb);
 967
 968         if (nb == 0) {
 969                 netdev_err(priv->dev, "%s: invalid size requested: %d\n",
 970                            __func__, nb);
 971                 err = -EINVAL;
 972                 goto out;
 973         }
 974         blen = ALIGN(nb, 4);
 975         packet = kzalloc(sizeof(struct if_spi_packet) + blen, GFP_ATOMIC);
 976         if (!packet) {
 977                 err = -ENOMEM;
 978                 goto out;
 979         }
 980         packet->blen = blen;
 981         memcpy(packet->buffer, buf, nb);
 982         memset(packet->buffer + nb, 0, blen - nb);
 983
 984         switch (type) {
 985         case MVMS_CMD:
 986                 priv->dnld_sent = DNLD_CMD_SENT;
 987                 spin_lock_irqsave(&card->buffer_lock, flags);
 988                 list_add_tail(&packet->list, &card->cmd_packet_list);
 989                 spin_unlock_irqrestore(&card->buffer_lock, flags);
 990                 break;
 991         case MVMS_DAT:
 992                 priv->dnld_sent = DNLD_DATA_SENT;
 993                 spin_lock_irqsave(&card->buffer_lock, flags);
 994                 list_add_tail(&packet->list, &card->data_packet_list);
 995                 spin_unlock_irqrestore(&card->buffer_lock, flags);
 996                 break;
 997         default:
 998                 kfree(packet);
 999                 netdev_err(priv->dev, "can't transfer buffer of type %d\n",
1000                            type);
1001                 err = -EINVAL;
1002                 break;
1003         }
1004
1005         /* Queue spi xfer work */
1006         queue_work(card->workqueue, &card->packet_work);
1007 out:
1008         lbs_deb_leave_args(LBS_DEB_SPI, "err=%d", err);
1009         return err;
1010 }
1011
1012 /*
1013  * Host Interrupts
1014  *
1015  * Service incoming interrupts from the WLAN device. We can't sleep here, so
1016  * don't try to talk on the SPI bus, just queue the SPI xfer work.
1017  */
1018 static irqreturn_t if_spi_host_interrupt(int irq, void *dev_id)
1019 {
1020         struct if_spi_card *card = dev_id;
1021
1022         queue_work(card->workqueue, &card->packet_work);
1023
1024         return IRQ_HANDLED;
1025 }
1026
1027 /*
1028  * SPI callbacks
1029  */
1030
1031 static int if_spi_init_card(struct if_spi_card *card)
1032 {
1033         struct lbs_private *priv = card->priv;
1034         int err, i;
1035         u32 scratch;
1036         const struct firmware *helper = NULL;
1037         const struct firmware *mainfw = NULL;
1038
1039         lbs_deb_enter(LBS_DEB_SPI);
1040
1041         err = spu_init(card, card->pdata->use_dummy_writes);
1042         if (err)
1043                 goto out;
1044         err = spu_get_chip_revision(card, &card->card_id, &card->card_rev);
1045         if (err)
1046                 goto out;
1047
1048         err = spu_read_u32(card, IF_SPI_SCRATCH_4_REG, &scratch);
1049         if (err)
1050                 goto out;
1051         if (scratch == SUCCESSFUL_FW_DOWNLOAD_MAGIC)
1052                 lbs_deb_spi("Firmware is already loaded for "
1053                             "Marvell WLAN 802.11 adapter\n");
1054         else {
1055                 /* Check if we support this card */
1056                 for (i = 0; i < ARRAY_SIZE(fw_table); i++) {
1057                         if (card->card_id == fw_table[i].model)
1058                                 break;
1059                 }
1060                 if (i == ARRAY_SIZE(fw_table)) {
1061                         netdev_err(priv->dev, "Unsupported chip_id: 0x%02x\n",
1062                                    card->card_id);
1063                         err = -ENODEV;
1064                         goto out;
1065                 }
1066
1067                 err = lbs_get_firmware(&card->spi->dev, NULL, NULL,
1068                                         card->card_id, &fw_table[0], &helper,
1069                                         &mainfw);
1070                 if (err) {
1071                         netdev_err(priv->dev, "failed to find firmware (%d)\n",
1072                                    err);
1073                         goto out;
1074                 }
1075
1076                 lbs_deb_spi("Initializing FW for Marvell WLAN 802.11 adapter "
1077                                 "(chip_id = 0x%04x, chip_rev = 0x%02x) "
1078                                 "attached to SPI bus_num %d, chip_select %d. "
1079                                 "spi->max_speed_hz=%d\n",
1080                                 card->card_id, card->card_rev,
1081                                 card->spi->master->bus_num,
1082                                 card->spi->chip_select,
1083                                 card->spi->max_speed_hz);
1084                 err = if_spi_prog_helper_firmware(card, helper);
1085                 if (err)
1086                         goto out;
1087                 err = if_spi_prog_main_firmware(card, mainfw);
1088                 if (err)
1089                         goto out;
1090                 lbs_deb_spi("loaded FW for Marvell WLAN 802.11 adapter\n");
1091         }
1092
1093         err = spu_set_interrupt_mode(card, 0, 1);
1094         if (err)
1095                 goto out;
1096
1097 out:
1098         if (helper)
1099                 release_firmware(helper);
1100         if (mainfw)
1101                 release_firmware(mainfw);
1102
1103         lbs_deb_leave_args(LBS_DEB_SPI, "err %d\n", err);
1104
1105         return err;
1106 }
1107
1108 static void if_spi_resume_worker(struct work_struct *work)
1109 {
1110         struct if_spi_card *card;
1111
1112         card = container_of(work, struct if_spi_card, resume_work);
1113
1114         if (card->suspended) {
1115                 if (card->pdata->setup)
1116                         card->pdata->setup(card->spi);
1117
1118                 /* Init card ... */
1119                 if_spi_init_card(card);
1120
1121                 enable_irq(card->spi->irq);
1122
1123                 /* And resume it ... */
1124                 lbs_resume(card->priv);
1125
1126                 card->suspended = 0;
1127         }
1128 }
1129
1130 static int __devinit if_spi_probe(struct spi_device *spi)
1131 {
1132         struct if_spi_card *card;
1133         struct lbs_private *priv = NULL;
1134         struct libertas_spi_platform_data *pdata = spi->dev.platform_data;
1135         int err = 0;
1136
1137         lbs_deb_enter(LBS_DEB_SPI);
1138
1139         if (!pdata) {
1140                 err = -EINVAL;
1141                 goto out;
1142         }
1143
1144         if (pdata->setup) {
1145                 err = pdata->setup(spi);
1146                 if (err)
1147                         goto out;
1148         }
1149
1150         /* Allocate card structure to represent this specific device */
1151         card = kzalloc(sizeof(struct if_spi_card), GFP_KERNEL);
1152         if (!card) {
1153                 err = -ENOMEM;
1154                 goto teardown;
1155         }
1156         spi_set_drvdata(spi, card);
1157         card->pdata = pdata;
1158         card->spi = spi;
1159         card->prev_xfer_time = jiffies;
1160
1161         INIT_LIST_HEAD(&card->cmd_packet_list);
1162         INIT_LIST_HEAD(&card->data_packet_list);
1163         spin_lock_init(&card->buffer_lock);
1164
1165         /* Initialize the SPI Interface Unit */
1166
1167         /* Firmware load */
1168         err = if_spi_init_card(card);
1169         if (err)
1170                 goto free_card;
1171
1172         /*
1173          * Register our card with libertas.
1174          * This will call alloc_etherdev.
1175          */
1176         priv = lbs_add_card(card, &spi->dev);
1177         if (!priv) {
1178                 err = -ENOMEM;
1179                 goto free_card;
1180         }
1181         card->priv = priv;
1182         priv->setup_fw_on_resume = 1;
1183         priv->card = card;
1184         priv->hw_host_to_card = if_spi_host_to_card;
1185         priv->enter_deep_sleep = NULL;
1186         priv->exit_deep_sleep = NULL;
1187         priv->reset_deep_sleep_wakeup = NULL;
1188         priv->fw_ready = 1;
1189
1190         /* Initialize interrupt handling stuff. */
1191         card->workqueue = create_workqueue("libertas_spi");
1192         INIT_WORK(&card->packet_work, if_spi_host_to_card_worker);
1193         INIT_WORK(&card->resume_work, if_spi_resume_worker);
1194
1195         err = request_irq(spi->irq, if_spi_host_interrupt,
1196                         IRQF_TRIGGER_FALLING, "libertas_spi", card);
1197         if (err) {
1198                 pr_err("can't get host irq line-- request_irq failed\n");
1199                 goto terminate_workqueue;
1200         }
1201
1202         /*
1203          * Start the card.
1204          * This will call register_netdev, and we'll start
1205          * getting interrupts...
1206          */
1207         err = lbs_start_card(priv);
1208         if (err)
1209                 goto release_irq;
1210
1211         lbs_deb_spi("Finished initializing WLAN module.\n");
1212
1213         /* successful exit */
1214         goto out;
1215
1216 release_irq:
1217         free_irq(spi->irq, card);
1218 terminate_workqueue:
1219         flush_workqueue(card->workqueue);
1220         destroy_workqueue(card->workqueue);
1221         lbs_remove_card(priv); /* will call free_netdev */
1222 free_card:
1223         free_if_spi_card(card);
1224 teardown:
1225         if (pdata->teardown)
1226                 pdata->teardown(spi);
1227 out:
1228         lbs_deb_leave_args(LBS_DEB_SPI, "err %d\n", err);
1229         return err;
1230 }
1231
1232 static int __devexit libertas_spi_remove(struct spi_device *spi)
1233 {
1234         struct if_spi_card *card = spi_get_drvdata(spi);
1235         struct lbs_private *priv = card->priv;
1236
1237         lbs_deb_spi("libertas_spi_remove\n");
1238         lbs_deb_enter(LBS_DEB_SPI);
1239
1240         cancel_work_sync(&card->resume_work);
1241
1242         lbs_stop_card(priv);
1243         lbs_remove_card(priv); /* will call free_netdev */
1244
1245         free_irq(spi->irq, card);
1246         flush_workqueue(card->workqueue);
1247         destroy_workqueue(card->workqueue);
1248         if (card->pdata->teardown)
1249                 card->pdata->teardown(spi);
1250         free_if_spi_card(card);
1251         lbs_deb_leave(LBS_DEB_SPI);
1252         return 0;
1253 }
1254
1255 static int if_spi_suspend(struct device *dev)
1256 {
1257         struct spi_device *spi = to_spi_device(dev);
1258         struct if_spi_card *card = spi_get_drvdata(spi);
1259
1260         if (!card->suspended) {
1261                 lbs_suspend(card->priv);
1262                 flush_workqueue(card->workqueue);
1263                 disable_irq(spi->irq);
1264
1265                 if (card->pdata->teardown)
1266                         card->pdata->teardown(spi);
1267                 card->suspended = 1;
1268         }
1269
1270         return 0;
1271 }
1272
1273 static int if_spi_resume(struct device *dev)
1274 {
1275         struct spi_device *spi = to_spi_device(dev);
1276         struct if_spi_card *card = spi_get_drvdata(spi);
1277
1278         /* Schedule delayed work */
1279         schedule_work(&card->resume_work);
1280
1281         return 0;
1282 }
1283
1284 static const struct dev_pm_ops if_spi_pm_ops = {
1285         .suspend        = if_spi_suspend,
1286         .resume         = if_spi_resume,
1287 };
1288
1289 static struct spi_driver libertas_spi_driver = {
1290         .probe  = if_spi_probe,
1291         .remove = __devexit_p(libertas_spi_remove),
1292         .driver = {
1293                 .name   = "libertas_spi",
1294                 .bus    = &spi_bus_type,
1295                 .owner  = THIS_MODULE,
1296                 .pm     = &if_spi_pm_ops,
1297         },
1298 };
1299
1300 /*
1301  * Module functions
1302  */
1303
1304 static int __init if_spi_init_module(void)
1305 {
1306         int ret = 0;
1307         lbs_deb_enter(LBS_DEB_SPI);
1308         printk(KERN_INFO "libertas_spi: Libertas SPI driver\n");
1309         ret = spi_register_driver(&libertas_spi_driver);
1310         lbs_deb_leave(LBS_DEB_SPI);
1311         return ret;
1312 }
1313
1314 static void __exit if_spi_exit_module(void)
1315 {
1316         lbs_deb_enter(LBS_DEB_SPI);
1317         spi_unregister_driver(&libertas_spi_driver);
1318         lbs_deb_leave(LBS_DEB_SPI);
1319 }
1320
1321 module_init(if_spi_init_module);
1322 module_exit(if_spi_exit_module);
1323
1324 MODULE_DESCRIPTION("Libertas SPI WLAN Driver");
1325 MODULE_AUTHOR("Andrey Yurovsky <andrey@cozybit.com>, "
1326               "Colin McCabe <colin@cozybit.com>");
1327 MODULE_LICENSE("GPL");
1328 MODULE_ALIAS("spi:libertas_spi");