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   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 #include <linux/moduleparam.h>
  21 #include <linux/firmware.h>
  22 #include <linux/jiffies.h>
  23 #include <linux/kthread.h>
  24 #include <linux/list.h>
  25 #include <linux/netdevice.h>
  26 #include <linux/spi/libertas_spi.h>
  27 #include <linux/spi/spi.h>
  28
  29 #include "host.h"
  30 #include "decl.h"
  31 #include "defs.h"
  32 #include "dev.h"
  33 #include "if_spi.h"
  34
  35 struct if_spi_packet {
  36         struct list_head                list;
  37         u16                             blen;
  38         u8                              buffer[0] __attribute__((aligned(4)));
  39 };
  40
  41 struct if_spi_card {
  42         struct spi_device               *spi;
  43         struct lbs_private              *priv;
  44         struct libertas_spi_platform_data *pdata;
  45
  46         char                            helper_fw_name[IF_SPI_FW_NAME_MAX];
  47         char                            main_fw_name[IF_SPI_FW_NAME_MAX];
  48
  49         /* The card ID and card revision, as reported by the hardware. */
  50         u16                             card_id;
  51         u8                              card_rev;
  52
  53         /* The last time that we initiated an SPU operation */
  54         unsigned long                   prev_xfer_time;
  55
  56         int                             use_dummy_writes;
  57         unsigned long                   spu_port_delay;
  58         unsigned long                   spu_reg_delay;
  59
  60         /* Handles all SPI communication (except for FW load) */
  61         struct task_struct              *spi_thread;
  62         int                             run_thread;
  63
  64         /* Used to wake up the spi_thread */
  65         struct semaphore                spi_ready;
  66         struct semaphore                spi_thread_terminated;
  67
  68         u8                              cmd_buffer[IF_SPI_CMD_BUF_SIZE];
  69
  70         /* A buffer of incoming packets from libertas core.
  71          * Since we can't sleep in hw_host_to_card, we have to buffer
  72          * them. */
  73         struct list_head                cmd_packet_list;
  74         struct list_head                data_packet_list;
  75
  76         /* Protects cmd_packet_list and data_packet_list */
  77         spinlock_t                      buffer_lock;
  78 };
  79
  80 static void free_if_spi_card(struct if_spi_card *card)
  81 {
  82         struct list_head *cursor, *next;
  83         struct if_spi_packet *packet;
  84
  85         BUG_ON(card->run_thread);
  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 static struct chip_ident chip_id_to_device_name[] = {
 101         { .chip_id = 0x04, .name = 8385 },
 102         { .chip_id = 0x0b, .name = 8686 },
 103 };
 104
 105 /*
 106  * SPI Interface Unit Routines
 107  *
 108  * The SPU sits between the host and the WLAN module.
 109  * All communication with the firmware is through SPU transactions.
 110  *
 111  * First we have to put a SPU register name on the bus. Then we can
 112  * either read from or write to that register.
 113  *
 114  */
 115
 116 static void spu_transaction_init(struct if_spi_card *card)
 117 {
 118         if (!time_after(jiffies, card->prev_xfer_time + 1)) {
 119                 /* Unfortunately, the SPU requires a delay between successive
 120                  * transactions. If our last transaction was more than a jiffy
 121                  * ago, we have obviously already delayed enough.
 122                  * If not, we have to busy-wait to be on the safe side. */
 123                 ndelay(400);
 124         }
 125 }
 126
 127 static void spu_transaction_finish(struct if_spi_card *card)
 128 {
 129         card->prev_xfer_time = jiffies;
 130 }
 131
 132 /* Write out a byte buffer to an SPI register,
 133  * using a series of 16-bit transfers. */
 134 static int spu_write(struct if_spi_card *card, u16 reg, const u8 *buf, int len)
 135 {
 136         int err = 0;
 137         u16 reg_out = cpu_to_le16(reg | IF_SPI_WRITE_OPERATION_MASK);
 138         struct spi_message m;
 139         struct spi_transfer reg_trans;
 140         struct spi_transfer data_trans;
 141
 142         spi_message_init(&m);
 143         memset(&reg_trans, 0, sizeof(reg_trans));
 144         memset(&data_trans, 0, sizeof(data_trans));
 145
 146         /* You must give an even number of bytes to the SPU, even if it
 147          * doesn't care about the last one.  */
 148         BUG_ON(len & 0x1);
 149
 150         spu_transaction_init(card);
 151
 152         /* write SPU register index */
 153         reg_trans.tx_buf = &reg_out;
 154         reg_trans.len = sizeof(reg_out);
 155
 156         data_trans.tx_buf = buf;
 157         data_trans.len = len;
 158
 159         spi_message_add_tail(&reg_trans, &m);
 160         spi_message_add_tail(&data_trans, &m);
 161
 162         err = spi_sync(card->spi, &m);
 163         spu_transaction_finish(card);
 164         return err;
 165 }
 166
 167 static inline int spu_write_u16(struct if_spi_card *card, u16 reg, u16 val)
 168 {
 169         u16 buff;
 170
 171         buff = cpu_to_le16(val);
 172         return spu_write(card, reg, (u8 *)&buff, sizeof(u16));
 173 }
 174
 175 static inline int spu_reg_is_port_reg(u16 reg)
 176 {
 177         switch (reg) {
 178         case IF_SPI_IO_RDWRPORT_REG:
 179         case IF_SPI_CMD_RDWRPORT_REG:
 180         case IF_SPI_DATA_RDWRPORT_REG:
 181                 return 1;
 182         default:
 183                 return 0;
 184         }
 185 }
 186
 187 static int spu_read(struct if_spi_card *card, u16 reg, u8 *buf, int len)
 188 {
 189         unsigned int delay;
 190         int err = 0;
 191         u16 reg_out = cpu_to_le16(reg | IF_SPI_READ_OPERATION_MASK);
 192         struct spi_message m;
 193         struct spi_transfer reg_trans;
 194         struct spi_transfer dummy_trans;
 195         struct spi_transfer data_trans;
 196
 197         /* You must take an even number of bytes from the SPU, even if you
 198          * don't care about the last one.  */
 199         BUG_ON(len & 0x1);
 200
 201         spu_transaction_init(card);
 202
 203         spi_message_init(&m);
 204         memset(&reg_trans, 0, sizeof(reg_trans));
 205         memset(&dummy_trans, 0, sizeof(dummy_trans));
 206         memset(&data_trans, 0, sizeof(data_trans));
 207
 208         /* write SPU register index */
 209         reg_trans.tx_buf = &reg_out;
 210         reg_trans.len = sizeof(reg_out);
 211         spi_message_add_tail(&reg_trans, &m);
 212
 213         delay = spu_reg_is_port_reg(reg) ? card->spu_port_delay :
 214                                                 card->spu_reg_delay;
 215         if (card->use_dummy_writes) {
 216                 /* Clock in dummy cycles while the SPU fills the FIFO */
 217                 dummy_trans.len = delay / 8;
 218                 spi_message_add_tail(&dummy_trans, &m);
 219         } else {
 220                 /* Busy-wait while the SPU fills the FIFO */
 221                 reg_trans.delay_usecs =
 222                         DIV_ROUND_UP((100 + (delay * 10)), 1000);
 223         }
 224
 225         /* read in data */
 226         data_trans.rx_buf = buf;
 227         data_trans.len = len;
 228         spi_message_add_tail(&data_trans, &m);
 229
 230         err = spi_sync(card->spi, &m);
 231         spu_transaction_finish(card);
 232         return err;
 233 }
 234
 235 /* Read 16 bits from an SPI register */
 236 static inline int spu_read_u16(struct if_spi_card *card, u16 reg, u16 *val)
 237 {
 238         u16 buf;
 239         int ret;
 240
 241         ret = spu_read(card, reg, (u8 *)&buf, sizeof(buf));
 242         if (ret == 0)
 243                 *val = le16_to_cpup(&buf);
 244         return ret;
 245 }
 246
 247 /* Read 32 bits from an SPI register.
 248  * The low 16 bits are read first. */
 249 static int spu_read_u32(struct if_spi_card *card, u16 reg, u32 *val)
 250 {
 251         u32 buf;
 252         int err;
 253
 254         err = spu_read(card, reg, (u8 *)&buf, sizeof(buf));
 255         if (!err)
 256                 *val = le32_to_cpup(&buf);
 257         return err;
 258 }
 259
 260 /* Keep reading 16 bits from an SPI register until you get the correct result.
 261  *
 262  * If mask = 0, the correct result is any non-zero number.
 263  * If mask != 0, the correct result is any number where
 264  * number & target_mask == target
 265  *
 266  * Returns -ETIMEDOUT if a second passes without the correct result. */
 267 static int spu_wait_for_u16(struct if_spi_card *card, u16 reg,
 268                         u16 target_mask, u16 target)
 269 {
 270         int err;
 271         unsigned long timeout = jiffies + 5*HZ;
 272         while (1) {
 273                 u16 val;
 274                 err = spu_read_u16(card, reg, &val);
 275                 if (err)
 276                         return err;
 277                 if (target_mask) {
 278                         if ((val & target_mask) == target)
 279                                 return 0;
 280                 } else {
 281                         if (val)
 282                                 return 0;
 283                 }
 284                 udelay(100);
 285                 if (time_after(jiffies, timeout)) {
 286                         lbs_pr_err("%s: timeout with val=%02x, "
 287                                "target_mask=%02x, target=%02x\n",
 288                                __func__, val, target_mask, target);
 289                         return -ETIMEDOUT;
 290                 }
 291         }
 292 }
 293
 294 /* Read 16 bits from an SPI register until you receive a specific value.
 295  * Returns -ETIMEDOUT if a 4 tries pass without success. */
 296 static int spu_wait_for_u32(struct if_spi_card *card, u32 reg, u32 target)
 297 {
 298         int err, try;
 299         for (try = 0; try < 4; ++try) {
 300                 u32 val = 0;
 301                 err = spu_read_u32(card, reg, &val);
 302                 if (err)
 303                         return err;
 304                 if (val == target)
 305                         return 0;
 306                 mdelay(100);
 307         }
 308         return -ETIMEDOUT;
 309 }
 310
 311 static int spu_set_interrupt_mode(struct if_spi_card *card,
 312                            int suppress_host_int,
 313                            int auto_int)
 314 {
 315         int err = 0;
 316
 317         /* We can suppress a host interrupt by clearing the appropriate
 318          * bit in the "host interrupt status mask" register */
 319         if (suppress_host_int) {
 320                 err = spu_write_u16(card, IF_SPI_HOST_INT_STATUS_MASK_REG, 0);
 321                 if (err)
 322                         return err;
 323         } else {
 324                 err = spu_write_u16(card, IF_SPI_HOST_INT_STATUS_MASK_REG,
 325                               IF_SPI_HISM_TX_DOWNLOAD_RDY |
 326                               IF_SPI_HISM_RX_UPLOAD_RDY |
 327                               IF_SPI_HISM_CMD_DOWNLOAD_RDY |
 328                               IF_SPI_HISM_CARDEVENT |
 329                               IF_SPI_HISM_CMD_UPLOAD_RDY);
 330                 if (err)
 331                         return err;
 332         }
 333
 334         /* If auto-interrupts are on, the completion of certain transactions
 335          * will trigger an interrupt automatically. If auto-interrupts
 336          * are off, we need to set the "Card Interrupt Cause" register to
 337          * trigger a card interrupt. */
 338         if (auto_int) {
 339                 err = spu_write_u16(card, IF_SPI_HOST_INT_CTRL_REG,
 340                                 IF_SPI_HICT_TX_DOWNLOAD_OVER_AUTO |
 341                                 IF_SPI_HICT_RX_UPLOAD_OVER_AUTO |
 342                                 IF_SPI_HICT_CMD_DOWNLOAD_OVER_AUTO |
 343                                 IF_SPI_HICT_CMD_UPLOAD_OVER_AUTO);
 344                 if (err)
 345                         return err;
 346         } else {
 347                 err = spu_write_u16(card, IF_SPI_HOST_INT_STATUS_MASK_REG, 0);
 348                 if (err)
 349                         return err;
 350         }
 351         return err;
 352 }
 353
 354 static int spu_get_chip_revision(struct if_spi_card *card,
 355                                   u16 *card_id, u8 *card_rev)
 356 {
 357         int err = 0;
 358         u32 dev_ctrl;
 359         err = spu_read_u32(card, IF_SPI_DEVICEID_CTRL_REG, &dev_ctrl);
 360         if (err)
 361                 return err;
 362         *card_id = IF_SPI_DEVICEID_CTRL_REG_TO_CARD_ID(dev_ctrl);
 363         *card_rev = IF_SPI_DEVICEID_CTRL_REG_TO_CARD_REV(dev_ctrl);
 364         return err;
 365 }
 366
 367 static int spu_set_bus_mode(struct if_spi_card *card, u16 mode)
 368 {
 369         int err = 0;
 370         u16 rval;
 371         /* set bus mode */
 372         err = spu_write_u16(card, IF_SPI_SPU_BUS_MODE_REG, mode);
 373         if (err)
 374                 return err;
 375         /* Check that we were able to read back what we just wrote. */
 376         err = spu_read_u16(card, IF_SPI_SPU_BUS_MODE_REG, &rval);
 377         if (err)
 378                 return err;
 379         if (rval != mode) {
 380                 lbs_pr_err("Can't read bus mode register.\n");
 381                 return -EIO;
 382         }
 383         return 0;
 384 }
 385
 386 static int spu_init(struct if_spi_card *card, int use_dummy_writes)
 387 {
 388         int err = 0;
 389         u32 delay;
 390
 391         /* We have to start up in timed delay mode so that we can safely
 392          * read the Delay Read Register. */
 393         card->use_dummy_writes = 0;
 394         err = spu_set_bus_mode(card,
 395                                 IF_SPI_BUS_MODE_SPI_CLOCK_PHASE_RISING |
 396                                 IF_SPI_BUS_MODE_DELAY_METHOD_TIMED |
 397                                 IF_SPI_BUS_MODE_16_BIT_ADDRESS_16_BIT_DATA);
 398         if (err)
 399                 return err;
 400         card->spu_port_delay = 1000;
 401         card->spu_reg_delay = 1000;
 402         err = spu_read_u32(card, IF_SPI_DELAY_READ_REG, &delay);
 403         if (err)
 404                 return err;
 405         card->spu_port_delay = delay & 0x0000ffff;
 406         card->spu_reg_delay = (delay & 0xffff0000) >> 16;
 407
 408         /* If dummy clock delay mode has been requested, switch to it now */
 409         if (use_dummy_writes) {
 410                 card->use_dummy_writes = 1;
 411                 err = spu_set_bus_mode(card,
 412                                 IF_SPI_BUS_MODE_SPI_CLOCK_PHASE_RISING |
 413                                 IF_SPI_BUS_MODE_DELAY_METHOD_DUMMY_CLOCK |
 414                                 IF_SPI_BUS_MODE_16_BIT_ADDRESS_16_BIT_DATA);
 415                 if (err)
 416                         return err;
 417         }
 418
 419         lbs_deb_spi("Initialized SPU unit. "
 420                     "spu_port_delay=0x%04lx, spu_reg_delay=0x%04lx\n",
 421                     card->spu_port_delay, card->spu_reg_delay);
 422         return err;
 423 }
 424
 425 /*
 426  * Firmware Loading
 427  */
 428
 429 static int if_spi_prog_helper_firmware(struct if_spi_card *card)
 430 {
 431         int err = 0;
 432         const struct firmware *firmware = NULL;
 433         int bytes_remaining;
 434         const u8 *fw;
 435         u8 temp[HELPER_FW_LOAD_CHUNK_SZ];
 436         struct spi_device *spi = card->spi;
 437
 438         lbs_deb_enter(LBS_DEB_SPI);
 439
 440         err = spu_set_interrupt_mode(card, 1, 0);
 441         if (err)
 442                 goto out;
 443         /* Get helper firmware image */
 444         err = request_firmware(&firmware, card->helper_fw_name, &spi->dev);
 445         if (err) {
 446                 lbs_pr_err("request_firmware failed with err = %d\n", err);
 447                 goto out;
 448         }
 449         bytes_remaining = firmware->size;
 450         fw = firmware->data;
 451
 452         /* Load helper firmware image */
 453         while (bytes_remaining > 0) {
 454                 /* Scratch pad 1 should contain the number of bytes we
 455                  * want to download to the firmware */
 456                 err = spu_write_u16(card, IF_SPI_SCRATCH_1_REG,
 457                                         HELPER_FW_LOAD_CHUNK_SZ);
 458                 if (err)
 459                         goto release_firmware;
 460
 461                 err = spu_wait_for_u16(card, IF_SPI_HOST_INT_STATUS_REG,
 462                                         IF_SPI_HIST_CMD_DOWNLOAD_RDY,
 463                                         IF_SPI_HIST_CMD_DOWNLOAD_RDY);
 464                 if (err)
 465                         goto release_firmware;
 466
 467                 /* Feed the data into the command read/write port reg
 468                  * in chunks of 64 bytes */
 469                 memset(temp, 0, sizeof(temp));
 470                 memcpy(temp, fw,
 471                        min(bytes_remaining, HELPER_FW_LOAD_CHUNK_SZ));
 472                 mdelay(10);
 473                 err = spu_write(card, IF_SPI_CMD_RDWRPORT_REG,
 474                                         temp, HELPER_FW_LOAD_CHUNK_SZ);
 475                 if (err)
 476                         goto release_firmware;
 477
 478                 /* Interrupt the boot code */
 479                 err = spu_write_u16(card, IF_SPI_HOST_INT_STATUS_REG, 0);
 480                 if (err)
 481                         goto release_firmware;
 482                 err = spu_write_u16(card, IF_SPI_CARD_INT_CAUSE_REG,
 483                                        IF_SPI_CIC_CMD_DOWNLOAD_OVER);
 484                 if (err)
 485                         goto release_firmware;
 486                 bytes_remaining -= HELPER_FW_LOAD_CHUNK_SZ;
 487                 fw += HELPER_FW_LOAD_CHUNK_SZ;
 488         }
 489
 490         /* Once the helper / single stage firmware download is complete,
 491          * write 0 to scratch pad 1 and interrupt the
 492          * bootloader. This completes the helper download. */
 493         err = spu_write_u16(card, IF_SPI_SCRATCH_1_REG, FIRMWARE_DNLD_OK);
 494         if (err)
 495                 goto release_firmware;
 496         err = spu_write_u16(card, IF_SPI_HOST_INT_STATUS_REG, 0);
 497         if (err)
 498                 goto release_firmware;
 499         err = spu_write_u16(card, IF_SPI_CARD_INT_CAUSE_REG,
 500                                 IF_SPI_CIC_CMD_DOWNLOAD_OVER);
 501                 goto release_firmware;
 502
 503         lbs_deb_spi("waiting for helper to boot...\n");
 504
 505 release_firmware:
 506         release_firmware(firmware);
 507 out:
 508         if (err)
 509                 lbs_pr_err("failed to load helper firmware (err=%d)\n", err);
 510         lbs_deb_leave_args(LBS_DEB_SPI, "err %d", err);
 511         return err;
 512 }
 513
 514 /* Returns the length of the next packet the firmware expects us to send
 515  * Sets crc_err if the previous transfer had a CRC error. */
 516 static int if_spi_prog_main_firmware_check_len(struct if_spi_card *card,
 517                                                 int *crc_err)
 518 {
 519         u16 len;
 520         int err = 0;
 521
 522         /* wait until the host interrupt status register indicates
 523          * that we are ready to download */
 524         err = spu_wait_for_u16(card, IF_SPI_HOST_INT_STATUS_REG,
 525                                 IF_SPI_HIST_CMD_DOWNLOAD_RDY,
 526                                 IF_SPI_HIST_CMD_DOWNLOAD_RDY);
 527         if (err) {
 528                 lbs_pr_err("timed out waiting for host_int_status\n");
 529                 return err;
 530         }
 531
 532         /* Ask the device how many bytes of firmware it wants. */
 533         err = spu_read_u16(card, IF_SPI_SCRATCH_1_REG, &len);
 534         if (err)
 535                 return err;
 536
 537         if (len > IF_SPI_CMD_BUF_SIZE) {
 538                 lbs_pr_err("firmware load device requested a larger "
 539                            "tranfer than we are prepared to "
 540                            "handle. (len = %d)\n", len);
 541                 return -EIO;
 542         }
 543         if (len & 0x1) {
 544                 lbs_deb_spi("%s: crc error\n", __func__);
 545                 len &= ~0x1;
 546                 *crc_err = 1;
 547         } else
 548                 *crc_err = 0;
 549
 550         return len;
 551 }
 552
 553 static int if_spi_prog_main_firmware(struct if_spi_card *card)
 554 {
 555         int len, prev_len;
 556         int bytes, crc_err = 0, err = 0;
 557         const struct firmware *firmware = NULL;
 558         const u8 *fw;
 559         struct spi_device *spi = card->spi;
 560         u16 num_crc_errs;
 561
 562         lbs_deb_enter(LBS_DEB_SPI);
 563
 564         err = spu_set_interrupt_mode(card, 1, 0);
 565         if (err)
 566                 goto out;
 567
 568         /* Get firmware image */
 569         err = request_firmware(&firmware, card->main_fw_name, &spi->dev);
 570         if (err) {
 571                 lbs_pr_err("%s: can't get firmware '%s' from kernel. "
 572                         "err = %d\n", __func__, card->main_fw_name, err);
 573                 goto out;
 574         }
 575
 576         err = spu_wait_for_u16(card, IF_SPI_SCRATCH_1_REG, 0, 0);
 577         if (err) {
 578                 lbs_pr_err("%s: timed out waiting for initial "
 579                            "scratch reg = 0\n", __func__);
 580                 goto release_firmware;
 581         }
 582
 583         num_crc_errs = 0;
 584         prev_len = 0;
 585         bytes = firmware->size;
 586         fw = firmware->data;
 587         while ((len = if_spi_prog_main_firmware_check_len(card, &crc_err))) {
 588                 if (len < 0) {
 589                         err = len;
 590                         goto release_firmware;
 591                 }
 592                 if (bytes < 0) {
 593                         /* If there are no more bytes left, we would normally
 594                          * expect to have terminated with len = 0 */
 595                         lbs_pr_err("Firmware load wants more bytes "
 596                                    "than we have to offer.\n");
 597                         break;
 598                 }
 599                 if (crc_err) {
 600                         /* Previous transfer failed. */
 601                         if (++num_crc_errs > MAX_MAIN_FW_LOAD_CRC_ERR) {
 602                                 lbs_pr_err("Too many CRC errors encountered "
 603                                            "in firmware load.\n");
 604                                 err = -EIO;
 605                                 goto release_firmware;
 606                         }
 607                 } else {
 608                         /* Previous transfer succeeded. Advance counters. */
 609                         bytes -= prev_len;
 610                         fw += prev_len;
 611                 }
 612                 if (bytes < len) {
 613                         memset(card->cmd_buffer, 0, len);
 614                         memcpy(card->cmd_buffer, fw, bytes);
 615                 } else
 616                         memcpy(card->cmd_buffer, fw, len);
 617
 618                 err = spu_write_u16(card, IF_SPI_HOST_INT_STATUS_REG, 0);
 619                 if (err)
 620                         goto release_firmware;
 621                 err = spu_write(card, IF_SPI_CMD_RDWRPORT_REG,
 622                                 card->cmd_buffer, len);
 623                 if (err)
 624                         goto release_firmware;
 625                 err = spu_write_u16(card, IF_SPI_CARD_INT_CAUSE_REG ,
 626                                         IF_SPI_CIC_CMD_DOWNLOAD_OVER);
 627                 if (err)
 628                         goto release_firmware;
 629                 prev_len = len;
 630         }
 631         if (bytes > prev_len) {
 632                 lbs_pr_err("firmware load wants fewer bytes than "
 633                            "we have to offer.\n");
 634         }
 635
 636         /* Confirm firmware download */
 637         err = spu_wait_for_u32(card, IF_SPI_SCRATCH_4_REG,
 638                                         SUCCESSFUL_FW_DOWNLOAD_MAGIC);
 639         if (err) {
 640                 lbs_pr_err("failed to confirm the firmware download\n");
 641                 goto release_firmware;
 642         }
 643
 644 release_firmware:
 645         release_firmware(firmware);
 646
 647 out:
 648         if (err)
 649                 lbs_pr_err("failed to load firmware (err=%d)\n", err);
 650         lbs_deb_leave_args(LBS_DEB_SPI, "err %d", err);
 651         return err;
 652 }
 653
 654 /*
 655  * SPI Transfer Thread
 656  *
 657  * The SPI thread handles all SPI transfers, so there is no need for a lock.
 658  */
 659
 660 /* Move a command from the card to the host */
 661 static int if_spi_c2h_cmd(struct if_spi_card *card)
 662 {
 663         struct lbs_private *priv = card->priv;
 664         unsigned long flags;
 665         int err = 0;
 666         u16 len;
 667         u8 i;
 668
 669         /* We need a buffer big enough to handle whatever people send to
 670          * hw_host_to_card */
 671         BUILD_BUG_ON(IF_SPI_CMD_BUF_SIZE < LBS_CMD_BUFFER_SIZE);
 672         BUILD_BUG_ON(IF_SPI_CMD_BUF_SIZE < LBS_UPLD_SIZE);
 673
 674         /* It's just annoying if the buffer size isn't a multiple of 4, because
 675          * then we might have len <  IF_SPI_CMD_BUF_SIZE but
 676          * ALIGN(len, 4) > IF_SPI_CMD_BUF_SIZE */
 677         BUILD_BUG_ON(IF_SPI_CMD_BUF_SIZE % 4 != 0);
 678
 679         lbs_deb_enter(LBS_DEB_SPI);
 680
 681         /* How many bytes are there to read? */
 682         err = spu_read_u16(card, IF_SPI_SCRATCH_2_REG, &len);
 683         if (err)
 684                 goto out;
 685         if (!len) {
 686                 lbs_pr_err("%s: error: card has no data for host\n",
 687                            __func__);
 688                 err = -EINVAL;
 689                 goto out;
 690         } else if (len > IF_SPI_CMD_BUF_SIZE) {
 691                 lbs_pr_err("%s: error: response packet too large: "
 692                            "%d bytes, but maximum is %d\n",
 693                            __func__, len, IF_SPI_CMD_BUF_SIZE);
 694                 err = -EINVAL;
 695                 goto out;
 696         }
 697
 698         /* Read the data from the WLAN module into our command buffer */
 699         err = spu_read(card, IF_SPI_CMD_RDWRPORT_REG,
 700                                 card->cmd_buffer, ALIGN(len, 4));
 701         if (err)
 702                 goto out;
 703
 704         spin_lock_irqsave(&priv->driver_lock, flags);
 705         i = (priv->resp_idx == 0) ? 1 : 0;
 706         BUG_ON(priv->resp_len[i]);
 707         priv->resp_len[i] = len;
 708         memcpy(priv->resp_buf[i], card->cmd_buffer, len);
 709         lbs_notify_command_response(priv, i);
 710         spin_unlock_irqrestore(&priv->driver_lock, flags);
 711
 712 out:
 713         if (err)
 714                 lbs_pr_err("%s: err=%d\n", __func__, err);
 715         lbs_deb_leave(LBS_DEB_SPI);
 716         return err;
 717 }
 718
 719 /* Move data from the card to the host */
 720 static int if_spi_c2h_data(struct if_spi_card *card)
 721 {
 722         struct sk_buff *skb;
 723         char *data;
 724         u16 len;
 725         int err = 0;
 726
 727         lbs_deb_enter(LBS_DEB_SPI);
 728
 729         /* How many bytes are there to read? */
 730         err = spu_read_u16(card, IF_SPI_SCRATCH_1_REG, &len);
 731         if (err)
 732                 goto out;
 733         if (!len) {
 734                 lbs_pr_err("%s: error: card has no data for host\n",
 735                            __func__);
 736                 err = -EINVAL;
 737                 goto out;
 738         } else if (len > MRVDRV_ETH_RX_PACKET_BUFFER_SIZE) {
 739                 lbs_pr_err("%s: error: card has %d bytes of data, but "
 740                            "our maximum skb size is %lu\n",
 741                            __func__, len, MRVDRV_ETH_RX_PACKET_BUFFER_SIZE);
 742                 err = -EINVAL;
 743                 goto out;
 744         }
 745
 746         /* TODO: should we allocate a smaller skb if we have less data? */
 747         skb = dev_alloc_skb(MRVDRV_ETH_RX_PACKET_BUFFER_SIZE);
 748         if (!skb) {
 749                 err = -ENOBUFS;
 750                 goto out;
 751         }
 752         skb_reserve(skb, IPFIELD_ALIGN_OFFSET);
 753         data = skb_put(skb, len);
 754
 755         /* Read the data from the WLAN module into our skb... */
 756         err = spu_read(card, IF_SPI_DATA_RDWRPORT_REG, data, ALIGN(len, 4));
 757         if (err)
 758                 goto free_skb;
 759
 760         /* pass the SKB to libertas */
 761         err = lbs_process_rxed_packet(card->priv, skb);
 762         if (err)
 763                 goto free_skb;
 764
 765         /* success */
 766         goto out;
 767
 768 free_skb:
 769         dev_kfree_skb(skb);
 770 out:
 771         if (err)
 772                 lbs_pr_err("%s: err=%d\n", __func__, err);
 773         lbs_deb_leave(LBS_DEB_SPI);
 774         return err;
 775 }
 776
 777 /* Move data or a command from the host to the card. */
 778 static void if_spi_h2c(struct if_spi_card *card,
 779                         struct if_spi_packet *packet, int type)
 780 {
 781         int err = 0;
 782         u16 int_type, port_reg;
 783
 784         switch (type) {
 785         case MVMS_DAT:
 786                 int_type = IF_SPI_CIC_TX_DOWNLOAD_OVER;
 787                 port_reg = IF_SPI_DATA_RDWRPORT_REG;
 788                 break;
 789         case MVMS_CMD:
 790                 int_type = IF_SPI_CIC_CMD_DOWNLOAD_OVER;
 791                 port_reg = IF_SPI_CMD_RDWRPORT_REG;
 792                 break;
 793         default:
 794                 lbs_pr_err("can't transfer buffer of type %d\n", type);
 795                 err = -EINVAL;
 796                 goto out;
 797         }
 798
 799         /* Write the data to the card */
 800         err = spu_write(card, port_reg, packet->buffer, packet->blen);
 801         if (err)
 802                 goto out;
 803
 804 out:
 805         kfree(packet);
 806
 807         if (err)
 808                 lbs_pr_err("%s: error %d\n", __func__, err);
 809 }
 810
 811 /* Inform the host about a card event */
 812 static void if_spi_e2h(struct if_spi_card *card)
 813 {
 814         int err = 0;
 815         unsigned long flags;
 816         u32 cause;
 817         struct lbs_private *priv = card->priv;
 818
 819         err = spu_read_u32(card, IF_SPI_SCRATCH_3_REG, &cause);
 820         if (err)
 821                 goto out;
 822
 823         /* re-enable the card event interrupt */
 824         spu_write_u16(card, IF_SPI_HOST_INT_STATUS_REG,
 825                         ~IF_SPI_HICU_CARD_EVENT);
 826
 827         /* generate a card interrupt */
 828         spu_write_u16(card, IF_SPI_CARD_INT_CAUSE_REG, IF_SPI_CIC_HOST_EVENT);
 829
 830         spin_lock_irqsave(&priv->driver_lock, flags);
 831         lbs_queue_event(priv, cause & 0xff);
 832         spin_unlock_irqrestore(&priv->driver_lock, flags);
 833
 834 out:
 835         if (err)
 836                 lbs_pr_err("%s: error %d\n", __func__, err);
 837 }
 838
 839 static int lbs_spi_thread(void *data)
 840 {
 841         int err;
 842         struct if_spi_card *card = data;
 843         u16 hiStatus;
 844         unsigned long flags;
 845         struct if_spi_packet *packet;
 846
 847         while (1) {
 848                 /* Wait to be woken up by one of two things.  First, our ISR
 849                  * could tell us that something happened on the WLAN.
 850                  * Secondly, libertas could call hw_host_to_card with more
 851                  * data, which we might be able to send.
 852                  */
 853                 do {
 854                         err = down_interruptible(&card->spi_ready);
 855                         if (!card->run_thread) {
 856                                 up(&card->spi_thread_terminated);
 857                                 do_exit(0);
 858                         }
 859                 } while (err == EINTR);
 860
 861                 /* Read the host interrupt status register to see what we
 862                  * can do. */
 863                 err = spu_read_u16(card, IF_SPI_HOST_INT_STATUS_REG,
 864                                         &hiStatus);
 865                 if (err) {
 866                         lbs_pr_err("I/O error\n");
 867                         goto err;
 868                 }
 869
 870                 if (hiStatus & IF_SPI_HIST_CMD_UPLOAD_RDY)
 871                         err = if_spi_c2h_cmd(card);
 872                         if (err)
 873                                 goto err;
 874                 if (hiStatus & IF_SPI_HIST_RX_UPLOAD_RDY)
 875                         err = if_spi_c2h_data(card);
 876                         if (err)
 877                                 goto err;
 878                 if (hiStatus & IF_SPI_HIST_CMD_DOWNLOAD_RDY) {
 879                         /* This means two things. First of all,
 880                          * if there was a previous command sent, the card has
 881                          * successfully received it.
 882                          * Secondly, it is now ready to download another
 883                          * command.
 884                          */
 885                         lbs_host_to_card_done(card->priv);
 886
 887                         /* Do we have any command packets from the host to
 888                          * send? */
 889                         packet = NULL;
 890                         spin_lock_irqsave(&card->buffer_lock, flags);
 891                         if (!list_empty(&card->cmd_packet_list)) {
 892                                 packet = (struct if_spi_packet *)(card->
 893                                                 cmd_packet_list.next);
 894                                 list_del(&packet->list);
 895                         }
 896                         spin_unlock_irqrestore(&card->buffer_lock, flags);
 897
 898                         if (packet)
 899                                 if_spi_h2c(card, packet, MVMS_CMD);
 900                 }
 901                 if (hiStatus & IF_SPI_HIST_TX_DOWNLOAD_RDY) {
 902                         /* Do we have any data packets from the host to
 903                          * send? */
 904                         packet = NULL;
 905                         spin_lock_irqsave(&card->buffer_lock, flags);
 906                         if (!list_empty(&card->data_packet_list)) {
 907                                 packet = (struct if_spi_packet *)(card->
 908                                                 data_packet_list.next);
 909                                 list_del(&packet->list);
 910                         }
 911                         spin_unlock_irqrestore(&card->buffer_lock, flags);
 912
 913                         if (packet)
 914                                 if_spi_h2c(card, packet, MVMS_DAT);
 915                 }
 916                 if (hiStatus & IF_SPI_HIST_CARD_EVENT)
 917                         if_spi_e2h(card);
 918
 919 err:
 920                 if (err)
 921                         lbs_pr_err("%s: got error %d\n", __func__, err);
 922         }
 923 }
 924
 925 /* Block until lbs_spi_thread thread has terminated */
 926 static void if_spi_terminate_spi_thread(struct if_spi_card *card)
 927 {
 928         /* It would be nice to use kthread_stop here, but that function
 929          * can't wake threads waiting for a semaphore. */
 930         card->run_thread = 0;
 931         up(&card->spi_ready);
 932         down(&card->spi_thread_terminated);
 933 }
 934
 935 /*
 936  * Host to Card
 937  *
 938  * Called from Libertas to transfer some data to the WLAN device
 939  * We can't sleep here. */
 940 static int if_spi_host_to_card(struct lbs_private *priv,
 941                                 u8 type, u8 *buf, u16 nb)
 942 {
 943         int err = 0;
 944         unsigned long flags;
 945         struct if_spi_card *card = priv->card;
 946         struct if_spi_packet *packet;
 947         u16 blen;
 948
 949         lbs_deb_enter_args(LBS_DEB_SPI, "type %d, bytes %d", type, nb);
 950
 951         if (nb == 0) {
 952                 lbs_pr_err("%s: invalid size requested: %d\n", __func__, nb);
 953                 err = -EINVAL;
 954                 goto out;
 955         }
 956         blen = ALIGN(nb, 4);
 957         packet = kzalloc(sizeof(struct if_spi_packet) + blen, GFP_ATOMIC);
 958         if (!packet) {
 959                 err = -ENOMEM;
 960                 goto out;
 961         }
 962         packet->blen = blen;
 963         memcpy(packet->buffer, buf, nb);
 964         memset(packet->buffer + nb, 0, blen - nb);
 965
 966         switch (type) {
 967         case MVMS_CMD:
 968                 priv->dnld_sent = DNLD_CMD_SENT;
 969                 spin_lock_irqsave(&card->buffer_lock, flags);
 970                 list_add_tail(&packet->list, &card->cmd_packet_list);
 971                 spin_unlock_irqrestore(&card->buffer_lock, flags);
 972                 break;
 973         case MVMS_DAT:
 974                 priv->dnld_sent = DNLD_DATA_SENT;
 975                 spin_lock_irqsave(&card->buffer_lock, flags);
 976                 list_add_tail(&packet->list, &card->data_packet_list);
 977                 spin_unlock_irqrestore(&card->buffer_lock, flags);
 978                 break;
 979         default:
 980                 lbs_pr_err("can't transfer buffer of type %d", type);
 981                 err = -EINVAL;
 982                 break;
 983         }
 984
 985         /* Wake up the spi thread */
 986         up(&card->spi_ready);
 987 out:
 988         lbs_deb_leave_args(LBS_DEB_SPI, "err=%d", err);
 989         return err;
 990 }
 991
 992 /*
 993  * Host Interrupts
 994  *
 995  * Service incoming interrupts from the WLAN device. We can't sleep here, so
 996  * don't try to talk on the SPI bus, just wake up the SPI thread.
 997  */
 998 static irqreturn_t if_spi_host_interrupt(int irq, void *dev_id)
 999 {
1000         struct if_spi_card *card = dev_id;
1001
1002         up(&card->spi_ready);
1003         return IRQ_HANDLED;
1004 }
1005
1006 /*
1007  * SPI callbacks
1008  */
1009
1010 static int if_spi_calculate_fw_names(u16 card_id,
1011                               char *helper_fw, char *main_fw)
1012 {
1013         int i;
1014         for (i = 0; i < ARRAY_SIZE(chip_id_to_device_name); ++i) {
1015                 if (card_id == chip_id_to_device_name[i].chip_id)
1016                         break;
1017         }
1018         if (i == ARRAY_SIZE(chip_id_to_device_name)) {
1019                 lbs_pr_err("Unsupported chip_id: 0x%02x\n", card_id);
1020                 return -EAFNOSUPPORT;
1021         }
1022         snprintf(helper_fw, IF_SPI_FW_NAME_MAX, "libertas/gspi%d_hlp.bin",
1023                  chip_id_to_device_name[i].name);
1024         snprintf(main_fw, IF_SPI_FW_NAME_MAX, "libertas/gspi%d.bin",
1025                  chip_id_to_device_name[i].name);
1026         return 0;
1027 }
1028
1029 static int __devinit if_spi_probe(struct spi_device *spi)
1030 {
1031         struct if_spi_card *card;
1032         struct lbs_private *priv = NULL;
1033         struct libertas_spi_platform_data *pdata = spi->dev.platform_data;
1034         int err = 0;
1035         u32 scratch;
1036         struct sched_param param = { .sched_priority = 1 };
1037
1038         lbs_deb_enter(LBS_DEB_SPI);
1039
1040         if (!pdata) {
1041                 err = -EINVAL;
1042                 goto out;
1043         }
1044
1045         if (pdata->setup) {
1046                 err = pdata->setup(spi);
1047                 if (err)
1048                         goto out;
1049         }
1050
1051         /* Allocate card structure to represent this specific device */
1052         card = kzalloc(sizeof(struct if_spi_card), GFP_KERNEL);
1053         if (!card) {
1054                 err = -ENOMEM;
1055                 goto out;
1056         }
1057         spi_set_drvdata(spi, card);
1058         card->pdata = pdata;
1059         card->spi = spi;
1060         card->prev_xfer_time = jiffies;
1061
1062         sema_init(&card->spi_ready, 0);
1063         sema_init(&card->spi_thread_terminated, 0);
1064         INIT_LIST_HEAD(&card->cmd_packet_list);
1065         INIT_LIST_HEAD(&card->data_packet_list);
1066         spin_lock_init(&card->buffer_lock);
1067
1068         /* Initialize the SPI Interface Unit */
1069         err = spu_init(card, pdata->use_dummy_writes);
1070         if (err)
1071                 goto free_card;
1072         err = spu_get_chip_revision(card, &card->card_id, &card->card_rev);
1073         if (err)
1074                 goto free_card;
1075
1076         /* Firmware load */
1077         err = spu_read_u32(card, IF_SPI_SCRATCH_4_REG, &scratch);
1078         if (err)
1079                 goto free_card;
1080         if (scratch == SUCCESSFUL_FW_DOWNLOAD_MAGIC)
1081                 lbs_deb_spi("Firmware is already loaded for "
1082                             "Marvell WLAN 802.11 adapter\n");
1083         else {
1084                 err = if_spi_calculate_fw_names(card->card_id,
1085                                 card->helper_fw_name, card->main_fw_name);
1086                 if (err)
1087                         goto free_card;
1088
1089                 lbs_deb_spi("Initializing FW for Marvell WLAN 802.11 adapter "
1090                                 "(chip_id = 0x%04x, chip_rev = 0x%02x) "
1091                                 "attached to SPI bus_num %d, chip_select %d. "
1092                                 "spi->max_speed_hz=%d\n",
1093                                 card->card_id, card->card_rev,
1094                                 spi->master->bus_num, spi->chip_select,
1095                                 spi->max_speed_hz);
1096                 err = if_spi_prog_helper_firmware(card);
1097                 if (err)
1098                         goto free_card;
1099                 err = if_spi_prog_main_firmware(card);
1100                 if (err)
1101                         goto free_card;
1102                 lbs_deb_spi("loaded FW for Marvell WLAN 802.11 adapter\n");
1103         }
1104
1105         err = spu_set_interrupt_mode(card, 0, 1);
1106         if (err)
1107                 goto free_card;
1108
1109         /* Register our card with libertas.
1110          * This will call alloc_etherdev */
1111         priv = lbs_add_card(card, &spi->dev);
1112         if (!priv) {
1113                 err = -ENOMEM;
1114                 goto free_card;
1115         }
1116         card->priv = priv;
1117         priv->card = card;
1118         priv->hw_host_to_card = if_spi_host_to_card;
1119         priv->fw_ready = 1;
1120         priv->ps_supported = 1;
1121
1122         /* Initialize interrupt handling stuff. */
1123         card->run_thread = 1;
1124         card->spi_thread = kthread_run(lbs_spi_thread, card, "lbs_spi_thread");
1125         if (IS_ERR(card->spi_thread)) {
1126                 card->run_thread = 0;
1127                 err = PTR_ERR(card->spi_thread);
1128                 lbs_pr_err("error creating SPI thread: err=%d\n", err);
1129                 goto remove_card;
1130         }
1131         if (sched_setscheduler(card->spi_thread, SCHED_FIFO, &param))
1132                 lbs_pr_err("Error setting scheduler, using default.\n");
1133
1134         err = request_irq(spi->irq, if_spi_host_interrupt,
1135                         IRQF_TRIGGER_FALLING, "libertas_spi", card);
1136         if (err) {
1137                 lbs_pr_err("can't get host irq line-- request_irq failed\n");
1138                 goto terminate_thread;
1139         }
1140
1141         /* Start the card.
1142          * This will call register_netdev, and we'll start
1143          * getting interrupts... */
1144         err = lbs_start_card(priv);
1145         if (err)
1146                 goto release_irq;
1147
1148         lbs_deb_spi("Finished initializing WLAN module.\n");
1149
1150         /* successful exit */
1151         goto out;
1152
1153 release_irq:
1154         free_irq(spi->irq, card);
1155 terminate_thread:
1156         if_spi_terminate_spi_thread(card);
1157 remove_card:
1158         lbs_remove_card(priv); /* will call free_netdev */
1159 free_card:
1160         free_if_spi_card(card);
1161 out:
1162         lbs_deb_leave_args(LBS_DEB_SPI, "err %d\n", err);
1163         return err;
1164 }
1165
1166 static int __devexit libertas_spi_remove(struct spi_device *spi)
1167 {
1168         struct if_spi_card *card = spi_get_drvdata(spi);
1169         struct lbs_private *priv = card->priv;
1170
1171         lbs_deb_spi("libertas_spi_remove\n");
1172         lbs_deb_enter(LBS_DEB_SPI);
1173         priv->surpriseremoved = 1;
1174
1175         lbs_stop_card(priv);
1176         free_irq(spi->irq, card);
1177         if_spi_terminate_spi_thread(card);
1178         lbs_remove_card(priv); /* will call free_netdev */
1179         if (card->pdata->teardown)
1180                 card->pdata->teardown(spi);
1181         free_if_spi_card(card);
1182         lbs_deb_leave(LBS_DEB_SPI);
1183         return 0;
1184 }
1185
1186 static struct spi_driver libertas_spi_driver = {
1187         .probe  = if_spi_probe,
1188         .remove = __devexit_p(libertas_spi_remove),
1189         .driver = {
1190                 .name   = "libertas_spi",
1191                 .bus    = &spi_bus_type,
1192                 .owner  = THIS_MODULE,
1193         },
1194 };
1195
1196 /*
1197  * Module functions
1198  */
1199
1200 static int __init if_spi_init_module(void)
1201 {
1202         int ret = 0;
1203         lbs_deb_enter(LBS_DEB_SPI);
1204         printk(KERN_INFO "libertas_spi: Libertas SPI driver\n");
1205         ret = spi_register_driver(&libertas_spi_driver);
1206         lbs_deb_leave(LBS_DEB_SPI);
1207         return ret;
1208 }
1209
1210 static void __exit if_spi_exit_module(void)
1211 {
1212         lbs_deb_enter(LBS_DEB_SPI);
1213         spi_unregister_driver(&libertas_spi_driver);
1214         lbs_deb_leave(LBS_DEB_SPI);
1215 }
1216
1217 module_init(if_spi_init_module);
1218 module_exit(if_spi_exit_module);
1219
1220 MODULE_DESCRIPTION("Libertas SPI WLAN Driver");
1221 MODULE_AUTHOR("Andrey Yurovsky <andrey@cozybit.com>, "
1222               "Colin McCabe <colin@cozybit.com>");
1223 MODULE_LICENSE("GPL");