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/moduleparam.h>
  23 #include <linux/firmware.h>
  24 #include <linux/jiffies.h>
  25 #include <linux/list.h>
  26 #include <linux/netdevice.h>
  27 #include <linux/slab.h>
  28 #include <linux/spi/libertas_spi.h>
  29 #include <linux/spi/spi.h>
  30
  31 #include "host.h"
  32 #include "decl.h"
  33 #include "defs.h"
  34 #include "dev.h"
  35 #include "if_spi.h"
  36
  37 struct if_spi_packet {
  38         struct list_head                list;
  39         u16                             blen;
  40         u8                              buffer[0] __attribute__((aligned(4)));
  41 };
  42
  43 struct if_spi_card {
  44         struct spi_device               *spi;
  45         struct lbs_private              *priv;
  46         struct libertas_spi_platform_data *pdata;
  47
  48         /* The card ID and card revision, as reported by the hardware. */
  49         u16                             card_id;
  50         u8                              card_rev;
  51
  52         /* The last time that we initiated an SPU operation */
  53         unsigned long                   prev_xfer_time;
  54
  55         int                             use_dummy_writes;
  56         unsigned long                   spu_port_delay;
  57         unsigned long                   spu_reg_delay;
  58
  59         /* Handles all SPI communication (except for FW load) */
  60         struct workqueue_struct         *workqueue;
  61         struct work_struct              packet_work;
  62         struct work_struct              resume_work;
  63
  64         u8                              cmd_buffer[IF_SPI_CMD_BUF_SIZE];
  65
  66         /* A buffer of incoming packets from libertas core.
  67          * Since we can't sleep in hw_host_to_card, we have to buffer
  68          * them. */
  69         struct list_head                cmd_packet_list;
  70         struct list_head                data_packet_list;
  71
  72         /* Protects cmd_packet_list and data_packet_list */
  73         spinlock_t                      buffer_lock;
  74
  75         /* True is card suspended */
  76         u8                              suspended;
  77 };
  78
  79 static void free_if_spi_card(struct if_spi_card *card)
  80 {
  81         struct list_head *cursor, *next;
  82         struct if_spi_packet *packet;
  83
  84         list_for_each_safe(cursor, next, &card->cmd_packet_list) {
  85                 packet = container_of(cursor, struct if_spi_packet, list);
  86                 list_del(&packet->list);
  87                 kfree(packet);
  88         }
  89         list_for_each_safe(cursor, next, &card->data_packet_list) {
  90                 packet = container_of(cursor, struct if_spi_packet, list);
  91                 list_del(&packet->list);
  92                 kfree(packet);
  93         }
  94         spi_set_drvdata(card->spi, NULL);
  95         kfree(card);
  96 }
  97
  98 #define MODEL_8385      0x04
  99 #define MODEL_8686      0x0b
 100 #define MODEL_8688      0x10
 101
 102 static const struct lbs_fw_table fw_table[] = {
 103         { MODEL_8385, "libertas/gspi8385_helper.bin", "libertas/gspi8385.bin" },
 104         { MODEL_8385, "libertas/gspi8385_hlp.bin", "libertas/gspi8385.bin" },
 105         { MODEL_8686, "libertas/gspi8686_v9_helper.bin", "libertas/gspi8686_v9.bin" },
 106         { MODEL_8686, "libertas/gspi8686_hlp.bin", "libertas/gspi8686.bin" },
 107         { MODEL_8688, "libertas/gspi8688_helper.bin", "libertas/gspi8688.bin" },
 108         { 0, NULL, NULL }
 109 };
 110 MODULE_FIRMWARE("libertas/gspi8385_helper.bin");
 111 MODULE_FIRMWARE("libertas/gspi8385_hlp.bin");
 112 MODULE_FIRMWARE("libertas/gspi8385.bin");
 113 MODULE_FIRMWARE("libertas/gspi8686_v9_helper.bin");
 114 MODULE_FIRMWARE("libertas/gspi8686_v9.bin");
 115 MODULE_FIRMWARE("libertas/gspi8686_hlp.bin");
 116 MODULE_FIRMWARE("libertas/gspi8686.bin");
 117 MODULE_FIRMWARE("libertas/gspi8688_helper.bin");
 118 MODULE_FIRMWARE("libertas/gspi8688.bin");
 119
 120
 121 /*
 122  * SPI Interface Unit Routines
 123  *
 124  * The SPU sits between the host and the WLAN module.
 125  * All communication with the firmware is through SPU transactions.
 126  *
 127  * First we have to put a SPU register name on the bus. Then we can
 128  * either read from or write to that register.
 129  *
 130  */
 131
 132 static void spu_transaction_init(struct if_spi_card *card)
 133 {
 134         if (!time_after(jiffies, card->prev_xfer_time + 1)) {
 135                 /* Unfortunately, the SPU requires a delay between successive
 136                  * transactions. If our last transaction was more than a jiffy
 137                  * ago, we have obviously already delayed enough.
 138                  * If not, we have to busy-wait to be on the safe side. */
 139                 ndelay(400);
 140         }
 141 }
 142
 143 static void spu_transaction_finish(struct if_spi_card *card)
 144 {
 145         card->prev_xfer_time = jiffies;
 146 }
 147
 148 /*
 149  * Write out a byte buffer to an SPI register,
 150  * using a series of 16-bit transfers.
 151  */
 152 static int spu_write(struct if_spi_card *card, u16 reg, const u8 *buf, int len)
 153 {
 154         int err = 0;
 155         __le16 reg_out = cpu_to_le16(reg | IF_SPI_WRITE_OPERATION_MASK);
 156         struct spi_message m;
 157         struct spi_transfer reg_trans;
 158         struct spi_transfer data_trans;
 159
 160         spi_message_init(&m);
 161         memset(&reg_trans, 0, sizeof(reg_trans));
 162         memset(&data_trans, 0, sizeof(data_trans));
 163
 164         /* You must give an even number of bytes to the SPU, even if it
 165          * doesn't care about the last one.  */
 166         BUG_ON(len & 0x1);
 167
 168         spu_transaction_init(card);
 169
 170         /* write SPU register index */
 171         reg_trans.tx_buf = &reg_out;
 172         reg_trans.len = sizeof(reg_out);
 173
 174         data_trans.tx_buf = buf;
 175         data_trans.len = len;
 176
 177         spi_message_add_tail(&reg_trans, &m);
 178         spi_message_add_tail(&data_trans, &m);
 179
 180         err = spi_sync(card->spi, &m);
 181         spu_transaction_finish(card);
 182         return err;
 183 }
 184
 185 static inline int spu_write_u16(struct if_spi_card *card, u16 reg, u16 val)
 186 {
 187         __le16 buff;
 188
 189         buff = cpu_to_le16(val);
 190         return spu_write(card, reg, (u8 *)&buff, sizeof(u16));
 191 }
 192
 193 static inline int spu_reg_is_port_reg(u16 reg)
 194 {
 195         switch (reg) {
 196         case IF_SPI_IO_RDWRPORT_REG:
 197         case IF_SPI_CMD_RDWRPORT_REG:
 198         case IF_SPI_DATA_RDWRPORT_REG:
 199                 return 1;
 200         default:
 201                 return 0;
 202         }
 203 }
 204
 205 static int spu_read(struct if_spi_card *card, u16 reg, u8 *buf, int len)
 206 {
 207         unsigned int delay;
 208         int err = 0;
 209         __le16 reg_out = cpu_to_le16(reg | IF_SPI_READ_OPERATION_MASK);
 210         struct spi_message m;
 211         struct spi_transfer reg_trans;
 212         struct spi_transfer dummy_trans;
 213         struct spi_transfer data_trans;
 214
 215         /*
 216          * You must take an even number of bytes from the SPU, even if you
 217          * don't care about the last one.
 218          */
 219         BUG_ON(len & 0x1);
 220
 221         spu_transaction_init(card);
 222
 223         spi_message_init(&m);
 224         memset(&reg_trans, 0, sizeof(reg_trans));
 225         memset(&dummy_trans, 0, sizeof(dummy_trans));
 226         memset(&data_trans, 0, sizeof(data_trans));
 227
 228         /* write SPU register index */
 229         reg_trans.tx_buf = &reg_out;
 230         reg_trans.len = sizeof(reg_out);
 231         spi_message_add_tail(&reg_trans, &m);
 232
 233         delay = spu_reg_is_port_reg(reg) ? card->spu_port_delay :
 234                                                 card->spu_reg_delay;
 235         if (card->use_dummy_writes) {
 236                 /* Clock in dummy cycles while the SPU fills the FIFO */
 237                 dummy_trans.len = delay / 8;
 238                 spi_message_add_tail(&dummy_trans, &m);
 239         } else {
 240                 /* Busy-wait while the SPU fills the FIFO */
 241                 reg_trans.delay_usecs =
 242                         DIV_ROUND_UP((100 + (delay * 10)), 1000);
 243         }
 244
 245         /* read in data */
 246         data_trans.rx_buf = buf;
 247         data_trans.len = len;
 248         spi_message_add_tail(&data_trans, &m);
 249
 250         err = spi_sync(card->spi, &m);
 251         spu_transaction_finish(card);
 252         return err;
 253 }
 254
 255 /* Read 16 bits from an SPI register */
 256 static inline int spu_read_u16(struct if_spi_card *card, u16 reg, u16 *val)
 257 {
 258         __le16 buf;
 259         int ret;
 260
 261         ret = spu_read(card, reg, (u8 *)&buf, sizeof(buf));
 262         if (ret == 0)
 263                 *val = le16_to_cpup(&buf);
 264         return ret;
 265 }
 266
 267 /*
 268  * Read 32 bits from an SPI register.
 269  * The low 16 bits are read first.
 270  */
 271 static int spu_read_u32(struct if_spi_card *card, u16 reg, u32 *val)
 272 {
 273         __le32 buf;
 274         int err;
 275
 276         err = spu_read(card, reg, (u8 *)&buf, sizeof(buf));
 277         if (!err)
 278                 *val = le32_to_cpup(&buf);
 279         return err;
 280 }
 281
 282 /*
 283  * Keep reading 16 bits from an SPI register until you get the correct result.
 284  *
 285  * If mask = 0, the correct result is any non-zero number.
 286  * If mask != 0, the correct result is any number where
 287  * number & target_mask == target
 288  *
 289  * Returns -ETIMEDOUT if a second passes without the correct result.
 290  */
 291 static int spu_wait_for_u16(struct if_spi_card *card, u16 reg,
 292                         u16 target_mask, u16 target)
 293 {
 294         int err;
 295         unsigned long timeout = jiffies + 5*HZ;
 296         while (1) {
 297                 u16 val;
 298                 err = spu_read_u16(card, reg, &val);
 299                 if (err)
 300                         return err;
 301                 if (target_mask) {
 302                         if ((val & target_mask) == target)
 303                                 return 0;
 304                 } else {
 305                         if (val)
 306                                 return 0;
 307                 }
 308                 udelay(100);
 309                 if (time_after(jiffies, timeout)) {
 310                         pr_err("%s: timeout with val=%02x, target_mask=%02x, target=%02x\n",
 311                                __func__, val, target_mask, target);
 312                         return -ETIMEDOUT;
 313                 }
 314         }
 315 }
 316
 317 /*
 318  * Read 16 bits from an SPI register until you receive a specific value.
 319  * Returns -ETIMEDOUT if a 4 tries pass without success.
 320  */
 321 static int spu_wait_for_u32(struct if_spi_card *card, u32 reg, u32 target)
 322 {
 323         int err, try;
 324         for (try = 0; try < 4; ++try) {
 325                 u32 val = 0;
 326                 err = spu_read_u32(card, reg, &val);
 327                 if (err)
 328                         return err;
 329                 if (val == target)
 330                         return 0;
 331                 mdelay(100);
 332         }
 333         return -ETIMEDOUT;
 334 }
 335
 336 static int spu_set_interrupt_mode(struct if_spi_card *card,
 337                            int suppress_host_int,
 338                            int auto_int)
 339 {
 340         int err = 0;
 341
 342         /*
 343          * We can suppress a host interrupt by clearing the appropriate
 344          * bit in the "host interrupt status mask" register
 345          */
 346         if (suppress_host_int) {
 347                 err = spu_write_u16(card, IF_SPI_HOST_INT_STATUS_MASK_REG, 0);
 348                 if (err)
 349                         return err;
 350         } else {
 351                 err = spu_write_u16(card, IF_SPI_HOST_INT_STATUS_MASK_REG,
 352                               IF_SPI_HISM_TX_DOWNLOAD_RDY |
 353                               IF_SPI_HISM_RX_UPLOAD_RDY |
 354                               IF_SPI_HISM_CMD_DOWNLOAD_RDY |
 355                               IF_SPI_HISM_CARDEVENT |
 356                               IF_SPI_HISM_CMD_UPLOAD_RDY);
 357                 if (err)
 358                         return err;
 359         }
 360
 361         /*
 362          * If auto-interrupts are on, the completion of certain transactions
 363          * will trigger an interrupt automatically. If auto-interrupts
 364          * are off, we need to set the "Card Interrupt Cause" register to
 365          * trigger a card interrupt.
 366          */
 367         if (auto_int) {
 368                 err = spu_write_u16(card, IF_SPI_HOST_INT_CTRL_REG,
 369                                 IF_SPI_HICT_TX_DOWNLOAD_OVER_AUTO |
 370                                 IF_SPI_HICT_RX_UPLOAD_OVER_AUTO |
 371                                 IF_SPI_HICT_CMD_DOWNLOAD_OVER_AUTO |
 372                                 IF_SPI_HICT_CMD_UPLOAD_OVER_AUTO);
 373                 if (err)
 374                         return err;
 375         } else {
 376                 err = spu_write_u16(card, IF_SPI_HOST_INT_STATUS_MASK_REG, 0);
 377                 if (err)
 378                         return err;
 379         }
 380         return err;
 381 }
 382
 383 static int spu_get_chip_revision(struct if_spi_card *card,
 384                                   u16 *card_id, u8 *card_rev)
 385 {
 386         int err = 0;
 387         u32 dev_ctrl;
 388         err = spu_read_u32(card, IF_SPI_DEVICEID_CTRL_REG, &dev_ctrl);
 389         if (err)
 390                 return err;
 391         *card_id = IF_SPI_DEVICEID_CTRL_REG_TO_CARD_ID(dev_ctrl);
 392         *card_rev = IF_SPI_DEVICEID_CTRL_REG_TO_CARD_REV(dev_ctrl);
 393         return err;
 394 }
 395
 396 static int spu_set_bus_mode(struct if_spi_card *card, u16 mode)
 397 {
 398         int err = 0;
 399         u16 rval;
 400         /* set bus mode */
 401         err = spu_write_u16(card, IF_SPI_SPU_BUS_MODE_REG, mode);
 402         if (err)
 403                 return err;
 404         /* Check that we were able to read back what we just wrote. */
 405         err = spu_read_u16(card, IF_SPI_SPU_BUS_MODE_REG, &rval);
 406         if (err)
 407                 return err;
 408         if ((rval & 0xF) != mode) {
 409                 pr_err("Can't read bus mode register\n");
 410                 return -EIO;
 411         }
 412         return 0;
 413 }
 414
 415 static int spu_init(struct if_spi_card *card, int use_dummy_writes)
 416 {
 417         int err = 0;
 418         u32 delay;
 419
 420         /*
 421          * We have to start up in timed delay mode so that we can safely
 422          * read the Delay Read Register.
 423          */
 424         card->use_dummy_writes = 0;
 425         err = spu_set_bus_mode(card,
 426                                 IF_SPI_BUS_MODE_SPI_CLOCK_PHASE_RISING |
 427                                 IF_SPI_BUS_MODE_DELAY_METHOD_TIMED |
 428                                 IF_SPI_BUS_MODE_16_BIT_ADDRESS_16_BIT_DATA);
 429         if (err)
 430                 return err;
 431         card->spu_port_delay = 1000;
 432         card->spu_reg_delay = 1000;
 433         err = spu_read_u32(card, IF_SPI_DELAY_READ_REG, &delay);
 434         if (err)
 435                 return err;
 436         card->spu_port_delay = delay & 0x0000ffff;
 437         card->spu_reg_delay = (delay & 0xffff0000) >> 16;
 438
 439         /* If dummy clock delay mode has been requested, switch to it now */
 440         if (use_dummy_writes) {
 441                 card->use_dummy_writes = 1;
 442                 err = spu_set_bus_mode(card,
 443                                 IF_SPI_BUS_MODE_SPI_CLOCK_PHASE_RISING |
 444                                 IF_SPI_BUS_MODE_DELAY_METHOD_DUMMY_CLOCK |
 445                                 IF_SPI_BUS_MODE_16_BIT_ADDRESS_16_BIT_DATA);
 446                 if (err)
 447                         return err;
 448         }
 449
 450         lbs_deb_spi("Initialized SPU unit. "
 451                     "spu_port_delay=0x%04lx, spu_reg_delay=0x%04lx\n",
 452                     card->spu_port_delay, card->spu_reg_delay);
 453         return err;
 454 }
 455
 456 /*
 457  * Firmware Loading
 458  */
 459
 460 static int if_spi_prog_helper_firmware(struct if_spi_card *card,
 461                                         const struct firmware *firmware)
 462 {
 463         int err = 0;
 464         int bytes_remaining;
 465         const u8 *fw;
 466         u8 temp[HELPER_FW_LOAD_CHUNK_SZ];
 467
 468         lbs_deb_enter(LBS_DEB_SPI);
 469
 470         err = spu_set_interrupt_mode(card, 1, 0);
 471         if (err)
 472                 goto out;
 473
 474         bytes_remaining = firmware->size;
 475         fw = firmware->data;
 476
 477         /* Load helper firmware image */
 478         while (bytes_remaining > 0) {
 479                 /*
 480                  * Scratch pad 1 should contain the number of bytes we
 481                  * want to download to the firmware
 482                  */
 483                 err = spu_write_u16(card, IF_SPI_SCRATCH_1_REG,
 484                                         HELPER_FW_LOAD_CHUNK_SZ);
 485                 if (err)
 486                         goto out;
 487
 488                 err = spu_wait_for_u16(card, IF_SPI_HOST_INT_STATUS_REG,
 489                                         IF_SPI_HIST_CMD_DOWNLOAD_RDY,
 490                                         IF_SPI_HIST_CMD_DOWNLOAD_RDY);
 491                 if (err)
 492                         goto out;
 493
 494                 /*
 495                  * Feed the data into the command read/write port reg
 496                  * in chunks of 64 bytes
 497                  */
 498                 memset(temp, 0, sizeof(temp));
 499                 memcpy(temp, fw,
 500                        min(bytes_remaining, HELPER_FW_LOAD_CHUNK_SZ));
 501                 mdelay(10);
 502                 err = spu_write(card, IF_SPI_CMD_RDWRPORT_REG,
 503                                         temp, HELPER_FW_LOAD_CHUNK_SZ);
 504                 if (err)
 505                         goto out;
 506
 507                 /* Interrupt the boot code */
 508                 err = spu_write_u16(card, IF_SPI_HOST_INT_STATUS_REG, 0);
 509                 if (err)
 510                         goto out;
 511                 err = spu_write_u16(card, IF_SPI_CARD_INT_CAUSE_REG,
 512                                        IF_SPI_CIC_CMD_DOWNLOAD_OVER);
 513                 if (err)
 514                         goto out;
 515                 bytes_remaining -= HELPER_FW_LOAD_CHUNK_SZ;
 516                 fw += HELPER_FW_LOAD_CHUNK_SZ;
 517         }
 518
 519         /*
 520          * Once the helper / single stage firmware download is complete,
 521          * write 0 to scratch pad 1 and interrupt the
 522          * bootloader. This completes the helper download.
 523          */
 524         err = spu_write_u16(card, IF_SPI_SCRATCH_1_REG, FIRMWARE_DNLD_OK);
 525         if (err)
 526                 goto out;
 527         err = spu_write_u16(card, IF_SPI_HOST_INT_STATUS_REG, 0);
 528         if (err)
 529                 goto out;
 530         err = spu_write_u16(card, IF_SPI_CARD_INT_CAUSE_REG,
 531                                 IF_SPI_CIC_CMD_DOWNLOAD_OVER);
 532                 goto out;
 533
 534         lbs_deb_spi("waiting for helper to boot...\n");
 535
 536 out:
 537         if (err)
 538                 pr_err("failed to load helper firmware (err=%d)\n", err);
 539         lbs_deb_leave_args(LBS_DEB_SPI, "err %d", err);
 540         return err;
 541 }
 542
 543 /*
 544  * Returns the length of the next packet the firmware expects us to send.
 545  * Sets crc_err if the previous transfer had a CRC error.
 546  */
 547 static int if_spi_prog_main_firmware_check_len(struct if_spi_card *card,
 548                                                 int *crc_err)
 549 {
 550         u16 len;
 551         int err = 0;
 552
 553         /*
 554          * wait until the host interrupt status register indicates
 555          * that we are ready to download
 556          */
 557         err = spu_wait_for_u16(card, IF_SPI_HOST_INT_STATUS_REG,
 558                                 IF_SPI_HIST_CMD_DOWNLOAD_RDY,
 559                                 IF_SPI_HIST_CMD_DOWNLOAD_RDY);
 560         if (err) {
 561                 pr_err("timed out waiting for host_int_status\n");
 562                 return err;
 563         }
 564
 565         /* Ask the device how many bytes of firmware it wants. */
 566         err = spu_read_u16(card, IF_SPI_SCRATCH_1_REG, &len);
 567         if (err)
 568                 return err;
 569
 570         if (len > IF_SPI_CMD_BUF_SIZE) {
 571                 pr_err("firmware load device requested a larger transfer than we are prepared to handle (len = %d)\n",
 572                        len);
 573                 return -EIO;
 574         }
 575         if (len & 0x1) {
 576                 lbs_deb_spi("%s: crc error\n", __func__);
 577                 len &= ~0x1;
 578                 *crc_err = 1;
 579         } else
 580                 *crc_err = 0;
 581
 582         return len;
 583 }
 584
 585 static int if_spi_prog_main_firmware(struct if_spi_card *card,
 586                                         const struct firmware *firmware)
 587 {
 588         struct lbs_private *priv = card->priv;
 589         int len, prev_len;
 590         int bytes, crc_err = 0, err = 0;
 591         const u8 *fw;
 592         u16 num_crc_errs;
 593
 594         lbs_deb_enter(LBS_DEB_SPI);
 595
 596         err = spu_set_interrupt_mode(card, 1, 0);
 597         if (err)
 598                 goto out;
 599
 600         err = spu_wait_for_u16(card, IF_SPI_SCRATCH_1_REG, 0, 0);
 601         if (err) {
 602                 netdev_err(priv->dev,
 603                            "%s: timed out waiting for initial scratch reg = 0\n",
 604                            __func__);
 605                 goto out;
 606         }
 607
 608         num_crc_errs = 0;
 609         prev_len = 0;
 610         bytes = firmware->size;
 611         fw = firmware->data;
 612         while ((len = if_spi_prog_main_firmware_check_len(card, &crc_err))) {
 613                 if (len < 0) {
 614                         err = len;
 615                         goto out;
 616                 }
 617                 if (bytes < 0) {
 618                         /*
 619                          * If there are no more bytes left, we would normally
 620                          * expect to have terminated with len = 0
 621                          */
 622                         netdev_err(priv->dev,
 623                                    "Firmware load wants more bytes than we have to offer.\n");
 624                         break;
 625                 }
 626                 if (crc_err) {
 627                         /* Previous transfer failed. */
 628                         if (++num_crc_errs > MAX_MAIN_FW_LOAD_CRC_ERR) {
 629                                 pr_err("Too many CRC errors encountered in firmware load.\n");
 630                                 err = -EIO;
 631                                 goto out;
 632                         }
 633                 } else {
 634                         /* Previous transfer succeeded. Advance counters. */
 635                         bytes -= prev_len;
 636                         fw += prev_len;
 637                 }
 638                 if (bytes < len) {
 639                         memset(card->cmd_buffer, 0, len);
 640                         memcpy(card->cmd_buffer, fw, bytes);
 641                 } else
 642                         memcpy(card->cmd_buffer, fw, len);
 643
 644                 err = spu_write_u16(card, IF_SPI_HOST_INT_STATUS_REG, 0);
 645                 if (err)
 646                         goto out;
 647                 err = spu_write(card, IF_SPI_CMD_RDWRPORT_REG,
 648                                 card->cmd_buffer, len);
 649                 if (err)
 650                         goto out;
 651                 err = spu_write_u16(card, IF_SPI_CARD_INT_CAUSE_REG ,
 652                                         IF_SPI_CIC_CMD_DOWNLOAD_OVER);
 653                 if (err)
 654                         goto out;
 655                 prev_len = len;
 656         }
 657         if (bytes > prev_len) {
 658                 pr_err("firmware load wants fewer bytes than we have to offer\n");
 659         }
 660
 661         /* Confirm firmware download */
 662         err = spu_wait_for_u32(card, IF_SPI_SCRATCH_4_REG,
 663                                         SUCCESSFUL_FW_DOWNLOAD_MAGIC);
 664         if (err) {
 665                 pr_err("failed to confirm the firmware download\n");
 666                 goto out;
 667         }
 668
 669 out:
 670         if (err)
 671                 pr_err("failed to load firmware (err=%d)\n", err);
 672         lbs_deb_leave_args(LBS_DEB_SPI, "err %d", err);
 673         return err;
 674 }
 675
 676 /*
 677  * SPI Transfer Thread
 678  *
 679  * The SPI worker handles all SPI transfers, so there is no need for a lock.
 680  */
 681
 682 /* Move a command from the card to the host */
 683 static int if_spi_c2h_cmd(struct if_spi_card *card)
 684 {
 685         struct lbs_private *priv = card->priv;
 686         unsigned long flags;
 687         int err = 0;
 688         u16 len;
 689         u8 i;
 690
 691         /*
 692          * We need a buffer big enough to handle whatever people send to
 693          * hw_host_to_card
 694          */
 695         BUILD_BUG_ON(IF_SPI_CMD_BUF_SIZE < LBS_CMD_BUFFER_SIZE);
 696         BUILD_BUG_ON(IF_SPI_CMD_BUF_SIZE < LBS_UPLD_SIZE);
 697
 698         /*
 699          * It's just annoying if the buffer size isn't a multiple of 4, because
 700          * then we might have len < IF_SPI_CMD_BUF_SIZE but
 701          * ALIGN(len, 4) > IF_SPI_CMD_BUF_SIZE
 702          */
 703         BUILD_BUG_ON(IF_SPI_CMD_BUF_SIZE % 4 != 0);
 704
 705         lbs_deb_enter(LBS_DEB_SPI);
 706
 707         /* How many bytes are there to read? */
 708         err = spu_read_u16(card, IF_SPI_SCRATCH_2_REG, &len);
 709         if (err)
 710                 goto out;
 711         if (!len) {
 712                 netdev_err(priv->dev, "%s: error: card has no data for host\n",
 713                            __func__);
 714                 err = -EINVAL;
 715                 goto out;
 716         } else if (len > IF_SPI_CMD_BUF_SIZE) {
 717                 netdev_err(priv->dev,
 718                            "%s: error: response packet too large: %d bytes, but maximum is %d\n",
 719                            __func__, len, IF_SPI_CMD_BUF_SIZE);
 720                 err = -EINVAL;
 721                 goto out;
 722         }
 723
 724         /* Read the data from the WLAN module into our command buffer */
 725         err = spu_read(card, IF_SPI_CMD_RDWRPORT_REG,
 726                                 card->cmd_buffer, ALIGN(len, 4));
 727         if (err)
 728                 goto out;
 729
 730         spin_lock_irqsave(&priv->driver_lock, flags);
 731         i = (priv->resp_idx == 0) ? 1 : 0;
 732         BUG_ON(priv->resp_len[i]);
 733         priv->resp_len[i] = len;
 734         memcpy(priv->resp_buf[i], card->cmd_buffer, len);
 735         lbs_notify_command_response(priv, i);
 736         spin_unlock_irqrestore(&priv->driver_lock, flags);
 737
 738 out:
 739         if (err)
 740                 netdev_err(priv->dev, "%s: err=%d\n", __func__, err);
 741         lbs_deb_leave(LBS_DEB_SPI);
 742         return err;
 743 }
 744
 745 /* Move data from the card to the host */
 746 static int if_spi_c2h_data(struct if_spi_card *card)
 747 {
 748         struct lbs_private *priv = card->priv;
 749         struct sk_buff *skb;
 750         char *data;
 751         u16 len;
 752         int err = 0;
 753
 754         lbs_deb_enter(LBS_DEB_SPI);
 755
 756         /* How many bytes are there to read? */
 757         err = spu_read_u16(card, IF_SPI_SCRATCH_1_REG, &len);
 758         if (err)
 759                 goto out;
 760         if (!len) {
 761                 netdev_err(priv->dev, "%s: error: card has no data for host\n",
 762                            __func__);
 763                 err = -EINVAL;
 764                 goto out;
 765         } else if (len > MRVDRV_ETH_RX_PACKET_BUFFER_SIZE) {
 766                 netdev_err(priv->dev,
 767                            "%s: error: card has %d bytes of data, but our maximum skb size is %zu\n",
 768                            __func__, len, MRVDRV_ETH_RX_PACKET_BUFFER_SIZE);
 769                 err = -EINVAL;
 770                 goto out;
 771         }
 772
 773         /* TODO: should we allocate a smaller skb if we have less data? */
 774         skb = dev_alloc_skb(MRVDRV_ETH_RX_PACKET_BUFFER_SIZE);
 775         if (!skb) {
 776                 err = -ENOBUFS;
 777                 goto out;
 778         }
 779         skb_reserve(skb, IPFIELD_ALIGN_OFFSET);
 780         data = skb_put(skb, len);
 781
 782         /* Read the data from the WLAN module into our skb... */
 783         err = spu_read(card, IF_SPI_DATA_RDWRPORT_REG, data, ALIGN(len, 4));
 784         if (err)
 785                 goto free_skb;
 786
 787         /* pass the SKB to libertas */
 788         err = lbs_process_rxed_packet(card->priv, skb);
 789         if (err)
 790                 goto free_skb;
 791
 792         /* success */
 793         goto out;
 794
 795 free_skb:
 796         dev_kfree_skb(skb);
 797 out:
 798         if (err)
 799                 netdev_err(priv->dev, "%s: err=%d\n", __func__, err);
 800         lbs_deb_leave(LBS_DEB_SPI);
 801         return err;
 802 }
 803
 804 /* Move data or a command from the host to the card. */
 805 static void if_spi_h2c(struct if_spi_card *card,
 806                         struct if_spi_packet *packet, int type)
 807 {
 808         struct lbs_private *priv = card->priv;
 809         int err = 0;
 810         u16 int_type, port_reg;
 811
 812         switch (type) {
 813         case MVMS_DAT:
 814                 int_type = IF_SPI_CIC_TX_DOWNLOAD_OVER;
 815                 port_reg = IF_SPI_DATA_RDWRPORT_REG;
 816                 break;
 817         case MVMS_CMD:
 818                 int_type = IF_SPI_CIC_CMD_DOWNLOAD_OVER;
 819                 port_reg = IF_SPI_CMD_RDWRPORT_REG;
 820                 break;
 821         default:
 822                 netdev_err(priv->dev, "can't transfer buffer of type %d\n",
 823                            type);
 824                 err = -EINVAL;
 825                 goto out;
 826         }
 827
 828         /* Write the data to the card */
 829         err = spu_write(card, port_reg, packet->buffer, packet->blen);
 830         if (err)
 831                 goto out;
 832
 833 out:
 834         kfree(packet);
 835
 836         if (err)
 837                 netdev_err(priv->dev, "%s: error %d\n", __func__, err);
 838 }
 839
 840 /* Inform the host about a card event */
 841 static void if_spi_e2h(struct if_spi_card *card)
 842 {
 843         int err = 0;
 844         u32 cause;
 845         struct lbs_private *priv = card->priv;
 846
 847         err = spu_read_u32(card, IF_SPI_SCRATCH_3_REG, &cause);
 848         if (err)
 849                 goto out;
 850
 851         /* re-enable the card event interrupt */
 852         spu_write_u16(card, IF_SPI_HOST_INT_STATUS_REG,
 853                         ~IF_SPI_HICU_CARD_EVENT);
 854
 855         /* generate a card interrupt */
 856         spu_write_u16(card, IF_SPI_CARD_INT_CAUSE_REG, IF_SPI_CIC_HOST_EVENT);
 857
 858         lbs_queue_event(priv, cause & 0xff);
 859 out:
 860         if (err)
 861                 netdev_err(priv->dev, "%s: error %d\n", __func__, err);
 862 }
 863
 864 static void if_spi_host_to_card_worker(struct work_struct *work)
 865 {
 866         int err;
 867         struct if_spi_card *card;
 868         u16 hiStatus;
 869         unsigned long flags;
 870         struct if_spi_packet *packet;
 871         struct lbs_private *priv;
 872
 873         card = container_of(work, struct if_spi_card, packet_work);
 874         priv = card->priv;
 875
 876         lbs_deb_enter(LBS_DEB_SPI);
 877
 878         /*
 879          * Read the host interrupt status register to see what we
 880          * can do.
 881          */
 882         err = spu_read_u16(card, IF_SPI_HOST_INT_STATUS_REG,
 883                                 &hiStatus);
 884         if (err) {
 885                 netdev_err(priv->dev, "I/O error\n");
 886                 goto err;
 887         }
 888
 889         if (hiStatus & IF_SPI_HIST_CMD_UPLOAD_RDY) {
 890                 err = if_spi_c2h_cmd(card);
 891                 if (err)
 892                         goto err;
 893         }
 894         if (hiStatus & IF_SPI_HIST_RX_UPLOAD_RDY) {
 895                 err = if_spi_c2h_data(card);
 896                 if (err)
 897                         goto err;
 898         }
 899
 900         /*
 901          * workaround: in PS mode, the card does not set the Command
 902          * Download Ready bit, but it sets TX Download Ready.
 903          */
 904         if (hiStatus & IF_SPI_HIST_CMD_DOWNLOAD_RDY ||
 905            (card->priv->psstate != PS_STATE_FULL_POWER &&
 906             (hiStatus & IF_SPI_HIST_TX_DOWNLOAD_RDY))) {
 907                 /*
 908                  * This means two things. First of all,
 909                  * if there was a previous command sent, the card has
 910                  * successfully received it.
 911                  * Secondly, it is now ready to download another
 912                  * command.
 913                  */
 914                 lbs_host_to_card_done(card->priv);
 915
 916                 /* Do we have any command packets from the host to send? */
 917                 packet = NULL;
 918                 spin_lock_irqsave(&card->buffer_lock, flags);
 919                 if (!list_empty(&card->cmd_packet_list)) {
 920                         packet = (struct if_spi_packet *)(card->
 921                                         cmd_packet_list.next);
 922                         list_del(&packet->list);
 923                 }
 924                 spin_unlock_irqrestore(&card->buffer_lock, flags);
 925
 926                 if (packet)
 927                         if_spi_h2c(card, packet, MVMS_CMD);
 928         }
 929         if (hiStatus & IF_SPI_HIST_TX_DOWNLOAD_RDY) {
 930                 /* Do we have any data packets from the host to send? */
 931                 packet = NULL;
 932                 spin_lock_irqsave(&card->buffer_lock, flags);
 933                 if (!list_empty(&card->data_packet_list)) {
 934                         packet = (struct if_spi_packet *)(card->
 935                                         data_packet_list.next);
 936                         list_del(&packet->list);
 937                 }
 938                 spin_unlock_irqrestore(&card->buffer_lock, flags);
 939
 940                 if (packet)
 941                         if_spi_h2c(card, packet, MVMS_DAT);
 942         }
 943         if (hiStatus & IF_SPI_HIST_CARD_EVENT)
 944                 if_spi_e2h(card);
 945
 946 err:
 947         if (err)
 948                 netdev_err(priv->dev, "%s: got error %d\n", __func__, err);
 949
 950         lbs_deb_leave(LBS_DEB_SPI);
 951 }
 952
 953 /*
 954  * Host to Card
 955  *
 956  * Called from Libertas to transfer some data to the WLAN device
 957  * We can't sleep here.
 958  */
 959 static int if_spi_host_to_card(struct lbs_private *priv,
 960                                 u8 type, u8 *buf, u16 nb)
 961 {
 962         int err = 0;
 963         unsigned long flags;
 964         struct if_spi_card *card = priv->card;
 965         struct if_spi_packet *packet;
 966         u16 blen;
 967
 968         lbs_deb_enter_args(LBS_DEB_SPI, "type %d, bytes %d", type, nb);
 969
 970         if (nb == 0) {
 971                 netdev_err(priv->dev, "%s: invalid size requested: %d\n",
 972                            __func__, nb);
 973                 err = -EINVAL;
 974                 goto out;
 975         }
 976         blen = ALIGN(nb, 4);
 977         packet = kzalloc(sizeof(struct if_spi_packet) + blen, GFP_ATOMIC);
 978         if (!packet) {
 979                 err = -ENOMEM;
 980                 goto out;
 981         }
 982         packet->blen = blen;
 983         memcpy(packet->buffer, buf, nb);
 984         memset(packet->buffer + nb, 0, blen - nb);
 985
 986         switch (type) {
 987         case MVMS_CMD:
 988                 priv->dnld_sent = DNLD_CMD_SENT;
 989                 spin_lock_irqsave(&card->buffer_lock, flags);
 990                 list_add_tail(&packet->list, &card->cmd_packet_list);
 991                 spin_unlock_irqrestore(&card->buffer_lock, flags);
 992                 break;
 993         case MVMS_DAT:
 994                 priv->dnld_sent = DNLD_DATA_SENT;
 995                 spin_lock_irqsave(&card->buffer_lock, flags);
 996                 list_add_tail(&packet->list, &card->data_packet_list);
 997                 spin_unlock_irqrestore(&card->buffer_lock, flags);
 998                 break;
 999         default:
1000                 netdev_err(priv->dev, "can't transfer buffer of type %d\n",
1001                            type);
1002                 err = -EINVAL;
1003                 break;
1004         }
1005
1006         /* Queue spi xfer work */
1007         queue_work(card->workqueue, &card->packet_work);
1008 out:
1009         lbs_deb_leave_args(LBS_DEB_SPI, "err=%d", err);
1010         return err;
1011 }
1012
1013 /*
1014  * Host Interrupts
1015  *
1016  * Service incoming interrupts from the WLAN device. We can't sleep here, so
1017  * don't try to talk on the SPI bus, just queue the SPI xfer work.
1018  */
1019 static irqreturn_t if_spi_host_interrupt(int irq, void *dev_id)
1020 {
1021         struct if_spi_card *card = dev_id;
1022
1023         queue_work(card->workqueue, &card->packet_work);
1024
1025         return IRQ_HANDLED;
1026 }
1027
1028 /*
1029  * SPI callbacks
1030  */
1031
1032 static int if_spi_init_card(struct if_spi_card *card)
1033 {
1034         struct lbs_private *priv = card->priv;
1035         struct spi_device *spi = card->spi;
1036         int err, i;
1037         u32 scratch;
1038         const struct firmware *helper = NULL;
1039         const struct firmware *mainfw = NULL;
1040
1041         lbs_deb_enter(LBS_DEB_SPI);
1042
1043         err = spu_init(card, card->pdata->use_dummy_writes);
1044         if (err)
1045                 goto out;
1046         err = spu_get_chip_revision(card, &card->card_id, &card->card_rev);
1047         if (err)
1048                 goto out;
1049
1050         err = spu_read_u32(card, IF_SPI_SCRATCH_4_REG, &scratch);
1051         if (err)
1052                 goto out;
1053         if (scratch == SUCCESSFUL_FW_DOWNLOAD_MAGIC)
1054                 lbs_deb_spi("Firmware is already loaded for "
1055                             "Marvell WLAN 802.11 adapter\n");
1056         else {
1057                 /* Check if we support this card */
1058                 for (i = 0; i < ARRAY_SIZE(fw_table); i++) {
1059                         if (card->card_id == fw_table[i].model)
1060                                 break;
1061                 }
1062                 if (i == ARRAY_SIZE(fw_table)) {
1063                         netdev_err(priv->dev, "Unsupported chip_id: 0x%02x\n",
1064                                    card->card_id);
1065                         err = -ENODEV;
1066                         goto out;
1067                 }
1068
1069                 err = lbs_get_firmware(&card->spi->dev, NULL, NULL,
1070                                         card->card_id, &fw_table[0], &helper,
1071                                         &mainfw);
1072                 if (err) {
1073                         netdev_err(priv->dev, "failed to find firmware (%d)\n",
1074                                    err);
1075                         goto out;
1076                 }
1077
1078                 lbs_deb_spi("Initializing FW for Marvell WLAN 802.11 adapter "
1079                                 "(chip_id = 0x%04x, chip_rev = 0x%02x) "
1080                                 "attached to SPI bus_num %d, chip_select %d. "
1081                                 "spi->max_speed_hz=%d\n",
1082                                 card->card_id, card->card_rev,
1083                                 spi->master->bus_num, spi->chip_select,
1084                                 spi->max_speed_hz);
1085                 err = if_spi_prog_helper_firmware(card, helper);
1086                 if (err)
1087                         goto out;
1088                 err = if_spi_prog_main_firmware(card, mainfw);
1089                 if (err)
1090                         goto out;
1091                 lbs_deb_spi("loaded FW for Marvell WLAN 802.11 adapter\n");
1092         }
1093
1094         err = spu_set_interrupt_mode(card, 0, 1);
1095         if (err)
1096                 goto out;
1097
1098 out:
1099         if (helper)
1100                 release_firmware(helper);
1101         if (mainfw)
1102                 release_firmware(mainfw);
1103
1104         lbs_deb_leave_args(LBS_DEB_SPI, "err %d\n", err);
1105
1106         return err;
1107 }
1108
1109 static void if_spi_resume_worker(struct work_struct *work)
1110 {
1111         struct if_spi_card *card;
1112
1113         card = container_of(work, struct if_spi_card, resume_work);
1114
1115         if (card->suspended) {
1116                 if (card->pdata->setup)
1117                         card->pdata->setup(card->spi);
1118
1119                 /* Init card ... */
1120                 if_spi_init_card(card);
1121
1122                 enable_irq(card->spi->irq);
1123
1124                 /* And resume it ... */
1125                 lbs_resume(card->priv);
1126
1127                 card->suspended = 0;
1128         }
1129 }
1130
1131 static int __devinit if_spi_probe(struct spi_device *spi)
1132 {
1133         struct if_spi_card *card;
1134         struct lbs_private *priv = NULL;
1135         struct libertas_spi_platform_data *pdata = spi->dev.platform_data;
1136         int err = 0;
1137
1138         lbs_deb_enter(LBS_DEB_SPI);
1139
1140         if (!pdata) {
1141                 err = -EINVAL;
1142                 goto out;
1143         }
1144
1145         if (pdata->setup) {
1146                 err = pdata->setup(spi);
1147                 if (err)
1148                         goto out;
1149         }
1150
1151         /* Allocate card structure to represent this specific device */
1152         card = kzalloc(sizeof(struct if_spi_card), GFP_KERNEL);
1153         if (!card) {
1154                 err = -ENOMEM;
1155                 goto teardown;
1156         }
1157         spi_set_drvdata(spi, card);
1158         card->pdata = pdata;
1159         card->spi = spi;
1160         card->prev_xfer_time = jiffies;
1161
1162         INIT_LIST_HEAD(&card->cmd_packet_list);
1163         INIT_LIST_HEAD(&card->data_packet_list);
1164         spin_lock_init(&card->buffer_lock);
1165
1166         /* Initialize the SPI Interface Unit */
1167
1168         /* Firmware load */
1169         err = if_spi_init_card(card);
1170         if (err)
1171                 goto free_card;
1172
1173         /*
1174          * Register our card with libertas.
1175          * This will call alloc_etherdev.
1176          */
1177         priv = lbs_add_card(card, &spi->dev);
1178         if (!priv) {
1179                 err = -ENOMEM;
1180                 goto free_card;
1181         }
1182         card->priv = priv;
1183         priv->setup_fw_on_resume = 1;
1184         priv->card = card;
1185         priv->hw_host_to_card = if_spi_host_to_card;
1186         priv->enter_deep_sleep = NULL;
1187         priv->exit_deep_sleep = NULL;
1188         priv->reset_deep_sleep_wakeup = NULL;
1189         priv->fw_ready = 1;
1190
1191         /* Initialize interrupt handling stuff. */
1192         card->workqueue = create_workqueue("libertas_spi");
1193         INIT_WORK(&card->packet_work, if_spi_host_to_card_worker);
1194         INIT_WORK(&card->resume_work, if_spi_resume_worker);
1195
1196         err = request_irq(spi->irq, if_spi_host_interrupt,
1197                         IRQF_TRIGGER_FALLING, "libertas_spi", card);
1198         if (err) {
1199                 pr_err("can't get host irq line-- request_irq failed\n");
1200                 goto terminate_workqueue;
1201         }
1202
1203         /*
1204          * Start the card.
1205          * This will call register_netdev, and we'll start
1206          * getting interrupts...
1207          */
1208         err = lbs_start_card(priv);
1209         if (err)
1210                 goto release_irq;
1211
1212         lbs_deb_spi("Finished initializing WLAN module.\n");
1213
1214         /* successful exit */
1215         goto out;
1216
1217 release_irq:
1218         free_irq(spi->irq, card);
1219 terminate_workqueue:
1220         flush_workqueue(card->workqueue);
1221         destroy_workqueue(card->workqueue);
1222         lbs_remove_card(priv); /* will call free_netdev */
1223 free_card:
1224         free_if_spi_card(card);
1225 teardown:
1226         if (pdata->teardown)
1227                 pdata->teardown(spi);
1228 out:
1229         lbs_deb_leave_args(LBS_DEB_SPI, "err %d\n", err);
1230         return err;
1231 }
1232
1233 static int __devexit libertas_spi_remove(struct spi_device *spi)
1234 {
1235         struct if_spi_card *card = spi_get_drvdata(spi);
1236         struct lbs_private *priv = card->priv;
1237
1238         lbs_deb_spi("libertas_spi_remove\n");
1239         lbs_deb_enter(LBS_DEB_SPI);
1240
1241         cancel_work_sync(&card->resume_work);
1242
1243         lbs_stop_card(priv);
1244         lbs_remove_card(priv); /* will call free_netdev */
1245
1246         free_irq(spi->irq, card);
1247         flush_workqueue(card->workqueue);
1248         destroy_workqueue(card->workqueue);
1249         if (card->pdata->teardown)
1250                 card->pdata->teardown(spi);
1251         free_if_spi_card(card);
1252         lbs_deb_leave(LBS_DEB_SPI);
1253         return 0;
1254 }
1255
1256 static int if_spi_suspend(struct device *dev)
1257 {
1258         struct spi_device *spi = to_spi_device(dev);
1259         struct if_spi_card *card = spi_get_drvdata(spi);
1260
1261         if (!card->suspended) {
1262                 lbs_suspend(card->priv);
1263                 flush_workqueue(card->workqueue);
1264                 disable_irq(spi->irq);
1265
1266                 if (card->pdata->teardown)
1267                         card->pdata->teardown(spi);
1268                 card->suspended = 1;
1269         }
1270
1271         return 0;
1272 }
1273
1274 static int if_spi_resume(struct device *dev)
1275 {
1276         struct spi_device *spi = to_spi_device(dev);
1277         struct if_spi_card *card = spi_get_drvdata(spi);
1278
1279         /* Schedule delayed work */
1280         schedule_work(&card->resume_work);
1281
1282         return 0;
1283 }
1284
1285 static const struct dev_pm_ops if_spi_pm_ops = {
1286         .suspend        = if_spi_suspend,
1287         .resume         = if_spi_resume,
1288 };
1289
1290 static struct spi_driver libertas_spi_driver = {
1291         .probe  = if_spi_probe,
1292         .remove = __devexit_p(libertas_spi_remove),
1293         .driver = {
1294                 .name   = "libertas_spi",
1295                 .bus    = &spi_bus_type,
1296                 .owner  = THIS_MODULE,
1297                 .pm     = &if_spi_pm_ops,
1298         },
1299 };
1300
1301 /*
1302  * Module functions
1303  */
1304
1305 static int __init if_spi_init_module(void)
1306 {
1307         int ret = 0;
1308         lbs_deb_enter(LBS_DEB_SPI);
1309         printk(KERN_INFO "libertas_spi: Libertas SPI driver\n");
1310         ret = spi_register_driver(&libertas_spi_driver);
1311         lbs_deb_leave(LBS_DEB_SPI);
1312         return ret;
1313 }
1314
1315 static void __exit if_spi_exit_module(void)
1316 {
1317         lbs_deb_enter(LBS_DEB_SPI);
1318         spi_unregister_driver(&libertas_spi_driver);
1319         lbs_deb_leave(LBS_DEB_SPI);
1320 }
1321
1322 module_init(if_spi_init_module);
1323 module_exit(if_spi_exit_module);
1324
1325 MODULE_DESCRIPTION("Libertas SPI WLAN Driver");
1326 MODULE_AUTHOR("Andrey Yurovsky <andrey@cozybit.com>, "
1327               "Colin McCabe <colin@cozybit.com>");
1328 MODULE_LICENSE("GPL");
1329 MODULE_ALIAS("spi:libertas_spi");