drivers/net/wireless/b43legacy/pio.c

   1 /*
   2
   3   Broadcom B43legacy wireless driver
   4
   5   PIO Transmission
   6
   7   Copyright (c) 2005 Michael Buesch <mb@bu3sch.de>
   8
   9   This program is free software; you can redistribute it and/or modify
  10   it under the terms of the GNU General Public License as published by
  11   the Free Software Foundation; either version 2 of the License, or
  12   (at your option) any later version.
  13
  14   This program is distributed in the hope that it will be useful,
  15   but WITHOUT ANY WARRANTY; without even the implied warranty of
  16   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17   GNU General Public License for more details.
  18
  19   You should have received a copy of the GNU General Public License
  20   along with this program; see the file COPYING.  If not, write to
  21   the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor,
  22   Boston, MA 02110-1301, USA.
  23
  24 */
  25
  26 #include "b43legacy.h"
  27 #include "pio.h"
  28 #include "main.h"
  29 #include "xmit.h"
  30
  31 #include <linux/delay.h>
  32
  33
  34 static void tx_start(struct b43legacy_pioqueue *queue)
  35 {
  36         b43legacy_pio_write(queue, B43legacy_PIO_TXCTL,
  37                             B43legacy_PIO_TXCTL_INIT);
  38 }
  39
  40 static void tx_octet(struct b43legacy_pioqueue *queue,
  41                      u8 octet)
  42 {
  43         if (queue->need_workarounds) {
  44                 b43legacy_pio_write(queue, B43legacy_PIO_TXDATA, octet);
  45                 b43legacy_pio_write(queue, B43legacy_PIO_TXCTL,
  46                                     B43legacy_PIO_TXCTL_WRITELO);
  47         } else {
  48                 b43legacy_pio_write(queue, B43legacy_PIO_TXCTL,
  49                                     B43legacy_PIO_TXCTL_WRITELO);
  50                 b43legacy_pio_write(queue, B43legacy_PIO_TXDATA, octet);
  51         }
  52 }
  53
  54 static u16 tx_get_next_word(const u8 *txhdr,
  55                             const u8 *packet,
  56                             size_t txhdr_size,
  57                             unsigned int *pos)
  58 {
  59         const u8 *source;
  60         unsigned int i = *pos;
  61         u16 ret;
  62
  63         if (i < txhdr_size)
  64                 source = txhdr;
  65         else {
  66                 source = packet;
  67                 i -= txhdr_size;
  68         }
  69         ret = le16_to_cpu(*((__le16 *)(source + i)));
  70         *pos += 2;
  71
  72         return ret;
  73 }
  74
  75 static void tx_data(struct b43legacy_pioqueue *queue,
  76                     u8 *txhdr,
  77                     const u8 *packet,
  78                     unsigned int octets)
  79 {
  80         u16 data;
  81         unsigned int i = 0;
  82
  83         if (queue->need_workarounds) {
  84                 data = tx_get_next_word(txhdr, packet,
  85                                         sizeof(struct b43legacy_txhdr_fw3), &i);
  86                 b43legacy_pio_write(queue, B43legacy_PIO_TXDATA, data);
  87         }
  88         b43legacy_pio_write(queue, B43legacy_PIO_TXCTL,
  89                             B43legacy_PIO_TXCTL_WRITELO |
  90                             B43legacy_PIO_TXCTL_WRITEHI);
  91         while (i < octets - 1) {
  92                 data = tx_get_next_word(txhdr, packet,
  93                                         sizeof(struct b43legacy_txhdr_fw3), &i);
  94                 b43legacy_pio_write(queue, B43legacy_PIO_TXDATA, data);
  95         }
  96         if (octets % 2)
  97                 tx_octet(queue, packet[octets -
  98                          sizeof(struct b43legacy_txhdr_fw3) - 1]);
  99 }
 100
 101 static void tx_complete(struct b43legacy_pioqueue *queue,
 102                         struct sk_buff *skb)
 103 {
 104         if (queue->need_workarounds) {
 105                 b43legacy_pio_write(queue, B43legacy_PIO_TXDATA,
 106                                     skb->data[skb->len - 1]);
 107                 b43legacy_pio_write(queue, B43legacy_PIO_TXCTL,
 108                                     B43legacy_PIO_TXCTL_WRITELO |
 109                                     B43legacy_PIO_TXCTL_COMPLETE);
 110         } else
 111                 b43legacy_pio_write(queue, B43legacy_PIO_TXCTL,
 112                                     B43legacy_PIO_TXCTL_COMPLETE);
 113 }
 114
 115 static u16 generate_cookie(struct b43legacy_pioqueue *queue,
 116                            struct b43legacy_pio_txpacket *packet)
 117 {
 118         u16 cookie = 0x0000;
 119         int packetindex;
 120
 121         /* We use the upper 4 bits for the PIO
 122          * controller ID and the lower 12 bits
 123          * for the packet index (in the cache).
 124          */
 125         switch (queue->mmio_base) {
 126         case B43legacy_MMIO_PIO1_BASE:
 127                 break;
 128         case B43legacy_MMIO_PIO2_BASE:
 129                 cookie = 0x1000;
 130                 break;
 131         case B43legacy_MMIO_PIO3_BASE:
 132                 cookie = 0x2000;
 133                 break;
 134         case B43legacy_MMIO_PIO4_BASE:
 135                 cookie = 0x3000;
 136                 break;
 137         default:
 138                 B43legacy_WARN_ON(1);
 139         }
 140         packetindex = pio_txpacket_getindex(packet);
 141         B43legacy_WARN_ON(!(((u16)packetindex & 0xF000) == 0x0000));
 142         cookie |= (u16)packetindex;
 143
 144         return cookie;
 145 }
 146
 147 static
 148 struct b43legacy_pioqueue *parse_cookie(struct b43legacy_wldev *dev,
 149                                         u16 cookie,
 150                                         struct b43legacy_pio_txpacket **packet)
 151 {
 152         struct b43legacy_pio *pio = &dev->pio;
 153         struct b43legacy_pioqueue *queue = NULL;
 154         int packetindex;
 155
 156         switch (cookie & 0xF000) {
 157         case 0x0000:
 158                 queue = pio->queue0;
 159                 break;
 160         case 0x1000:
 161                 queue = pio->queue1;
 162                 break;
 163         case 0x2000:
 164                 queue = pio->queue2;
 165                 break;
 166         case 0x3000:
 167                 queue = pio->queue3;
 168                 break;
 169         default:
 170                 B43legacy_WARN_ON(1);
 171         }
 172         packetindex = (cookie & 0x0FFF);
 173         B43legacy_WARN_ON(!(packetindex >= 0 && packetindex
 174                           < B43legacy_PIO_MAXTXPACKETS));
 175         *packet = &(queue->tx_packets_cache[packetindex]);
 176
 177         return queue;
 178 }
 179
 180 union txhdr_union {
 181         struct b43legacy_txhdr_fw3 txhdr_fw3;
 182 };
 183
 184 static int pio_tx_write_fragment(struct b43legacy_pioqueue *queue,
 185                                   struct sk_buff *skb,
 186                                   struct b43legacy_pio_txpacket *packet,
 187                                   size_t txhdr_size)
 188 {
 189         union txhdr_union txhdr_data;
 190         u8 *txhdr = NULL;
 191         unsigned int octets;
 192         int err;
 193
 194         txhdr = (u8 *)(&txhdr_data.txhdr_fw3);
 195
 196         B43legacy_WARN_ON(skb_shinfo(skb)->nr_frags != 0);
 197         err = b43legacy_generate_txhdr(queue->dev,
 198                                  txhdr, skb->data, skb->len,
 199                                  IEEE80211_SKB_CB(skb),
 200                                  generate_cookie(queue, packet));
 201         if (err)
 202                 return err;
 203
 204         tx_start(queue);
 205         octets = skb->len + txhdr_size;
 206         if (queue->need_workarounds)
 207                 octets--;
 208         tx_data(queue, txhdr, (u8 *)skb->data, octets);
 209         tx_complete(queue, skb);
 210
 211         return 0;
 212 }
 213
 214 static void free_txpacket(struct b43legacy_pio_txpacket *packet,
 215                           int irq_context)
 216 {
 217         struct b43legacy_pioqueue *queue = packet->queue;
 218
 219         if (packet->skb) {
 220                 if (irq_context)
 221                         dev_kfree_skb_irq(packet->skb);
 222                 else
 223                         dev_kfree_skb(packet->skb);
 224         }
 225         list_move(&packet->list, &queue->txfree);
 226         queue->nr_txfree++;
 227 }
 228
 229 static int pio_tx_packet(struct b43legacy_pio_txpacket *packet)
 230 {
 231         struct b43legacy_pioqueue *queue = packet->queue;
 232         struct sk_buff *skb = packet->skb;
 233         u16 octets;
 234         int err;
 235
 236         octets = (u16)skb->len + sizeof(struct b43legacy_txhdr_fw3);
 237         if (queue->tx_devq_size < octets) {
 238                 b43legacywarn(queue->dev->wl, "PIO queue too small. "
 239                         "Dropping packet.\n");
 240                 /* Drop it silently (return success) */
 241                 free_txpacket(packet, 1);
 242                 return 0;
 243         }
 244         B43legacy_WARN_ON(queue->tx_devq_packets >
 245                           B43legacy_PIO_MAXTXDEVQPACKETS);
 246         B43legacy_WARN_ON(queue->tx_devq_used > queue->tx_devq_size);
 247         /* Check if there is sufficient free space on the device
 248          * TX queue. If not, return and let the TX tasklet
 249          * retry later.
 250          */
 251         if (queue->tx_devq_packets == B43legacy_PIO_MAXTXDEVQPACKETS)
 252                 return -EBUSY;
 253         if (queue->tx_devq_used + octets > queue->tx_devq_size)
 254                 return -EBUSY;
 255         /* Now poke the device. */
 256         err = pio_tx_write_fragment(queue, skb, packet,
 257                               sizeof(struct b43legacy_txhdr_fw3));
 258         if (unlikely(err == -ENOKEY)) {
 259                 /* Drop this packet, as we don't have the encryption key
 260                  * anymore and must not transmit it unencrypted. */
 261                 free_txpacket(packet, 1);
 262                 return 0;
 263         }
 264
 265         /* Account for the packet size.
 266          * (We must not overflow the device TX queue)
 267          */
 268         queue->tx_devq_packets++;
 269         queue->tx_devq_used += octets;
 270
 271         /* Transmission started, everything ok, move the
 272          * packet to the txrunning list.
 273          */
 274         list_move_tail(&packet->list, &queue->txrunning);
 275
 276         return 0;
 277 }
 278
 279 static void tx_tasklet(unsigned long d)
 280 {
 281         struct b43legacy_pioqueue *queue = (struct b43legacy_pioqueue *)d;
 282         struct b43legacy_wldev *dev = queue->dev;
 283         unsigned long flags;
 284         struct b43legacy_pio_txpacket *packet, *tmp_packet;
 285         int err;
 286         u16 txctl;
 287
 288         spin_lock_irqsave(&dev->wl->irq_lock, flags);
 289         if (queue->tx_frozen)
 290                 goto out_unlock;
 291         txctl = b43legacy_pio_read(queue, B43legacy_PIO_TXCTL);
 292         if (txctl & B43legacy_PIO_TXCTL_SUSPEND)
 293                 goto out_unlock;
 294
 295         list_for_each_entry_safe(packet, tmp_packet, &queue->txqueue, list) {
 296                 /* Try to transmit the packet. This can fail, if
 297                  * the device queue is full. In case of failure, the
 298                  * packet is left in the txqueue.
 299                  * If transmission succeed, the packet is moved to txrunning.
 300                  * If it is impossible to transmit the packet, it
 301                  * is dropped.
 302                  */
 303                 err = pio_tx_packet(packet);
 304                 if (err)
 305                         break;
 306         }
 307 out_unlock:
 308         spin_unlock_irqrestore(&dev->wl->irq_lock, flags);
 309 }
 310
 311 static void setup_txqueues(struct b43legacy_pioqueue *queue)
 312 {
 313         struct b43legacy_pio_txpacket *packet;
 314         int i;
 315
 316         queue->nr_txfree = B43legacy_PIO_MAXTXPACKETS;
 317         for (i = 0; i < B43legacy_PIO_MAXTXPACKETS; i++) {
 318                 packet = &(queue->tx_packets_cache[i]);
 319
 320                 packet->queue = queue;
 321                 INIT_LIST_HEAD(&packet->list);
 322
 323                 list_add(&packet->list, &queue->txfree);
 324         }
 325 }
 326
 327 static
 328 struct b43legacy_pioqueue *b43legacy_setup_pioqueue(struct b43legacy_wldev *dev,
 329                                                     u16 pio_mmio_base)
 330 {
 331         struct b43legacy_pioqueue *queue;
 332         u32 value;
 333         u16 qsize;
 334
 335         queue = kzalloc(sizeof(*queue), GFP_KERNEL);
 336         if (!queue)
 337                 goto out;
 338
 339         queue->dev = dev;
 340         queue->mmio_base = pio_mmio_base;
 341         queue->need_workarounds = (dev->dev->id.revision < 3);
 342
 343         INIT_LIST_HEAD(&queue->txfree);
 344         INIT_LIST_HEAD(&queue->txqueue);
 345         INIT_LIST_HEAD(&queue->txrunning);
 346         tasklet_init(&queue->txtask, tx_tasklet,
 347                      (unsigned long)queue);
 348
 349         value = b43legacy_read32(dev, B43legacy_MMIO_MACCTL);
 350         value &= ~B43legacy_MACCTL_BE;
 351         b43legacy_write32(dev, B43legacy_MMIO_MACCTL, value);
 352
 353         qsize = b43legacy_read16(dev, queue->mmio_base
 354                                  + B43legacy_PIO_TXQBUFSIZE);
 355         if (qsize == 0) {
 356                 b43legacyerr(dev->wl, "This card does not support PIO "
 357                        "operation mode. Please use DMA mode "
 358                        "(module parameter pio=0).\n");
 359                 goto err_freequeue;
 360         }
 361         if (qsize <= B43legacy_PIO_TXQADJUST) {
 362                 b43legacyerr(dev->wl, "PIO tx device-queue too small (%u)\n",
 363                        qsize);
 364                 goto err_freequeue;
 365         }
 366         qsize -= B43legacy_PIO_TXQADJUST;
 367         queue->tx_devq_size = qsize;
 368
 369         setup_txqueues(queue);
 370
 371 out:
 372         return queue;
 373
 374 err_freequeue:
 375         kfree(queue);
 376         queue = NULL;
 377         goto out;
 378 }
 379
 380 static void cancel_transfers(struct b43legacy_pioqueue *queue)
 381 {
 382         struct b43legacy_pio_txpacket *packet, *tmp_packet;
 383
 384         tasklet_disable(&queue->txtask);
 385
 386         list_for_each_entry_safe(packet, tmp_packet, &queue->txrunning, list)
 387                 free_txpacket(packet, 0);
 388         list_for_each_entry_safe(packet, tmp_packet, &queue->txqueue, list)
 389                 free_txpacket(packet, 0);
 390 }
 391
 392 static void b43legacy_destroy_pioqueue(struct b43legacy_pioqueue *queue)
 393 {
 394         if (!queue)
 395                 return;
 396
 397         cancel_transfers(queue);
 398         kfree(queue);
 399 }
 400
 401 void b43legacy_pio_free(struct b43legacy_wldev *dev)
 402 {
 403         struct b43legacy_pio *pio;
 404
 405         if (!b43legacy_using_pio(dev))
 406                 return;
 407         pio = &dev->pio;
 408
 409         b43legacy_destroy_pioqueue(pio->queue3);
 410         pio->queue3 = NULL;
 411         b43legacy_destroy_pioqueue(pio->queue2);
 412         pio->queue2 = NULL;
 413         b43legacy_destroy_pioqueue(pio->queue1);
 414         pio->queue1 = NULL;
 415         b43legacy_destroy_pioqueue(pio->queue0);
 416         pio->queue0 = NULL;
 417 }
 418
 419 int b43legacy_pio_init(struct b43legacy_wldev *dev)
 420 {
 421         struct b43legacy_pio *pio = &dev->pio;
 422         struct b43legacy_pioqueue *queue;
 423         int err = -ENOMEM;
 424
 425         queue = b43legacy_setup_pioqueue(dev, B43legacy_MMIO_PIO1_BASE);
 426         if (!queue)
 427                 goto out;
 428         pio->queue0 = queue;
 429
 430         queue = b43legacy_setup_pioqueue(dev, B43legacy_MMIO_PIO2_BASE);
 431         if (!queue)
 432                 goto err_destroy0;
 433         pio->queue1 = queue;
 434
 435         queue = b43legacy_setup_pioqueue(dev, B43legacy_MMIO_PIO3_BASE);
 436         if (!queue)
 437                 goto err_destroy1;
 438         pio->queue2 = queue;
 439
 440         queue = b43legacy_setup_pioqueue(dev, B43legacy_MMIO_PIO4_BASE);
 441         if (!queue)
 442                 goto err_destroy2;
 443         pio->queue3 = queue;
 444
 445         if (dev->dev->id.revision < 3)
 446                 dev->irq_mask |= B43legacy_IRQ_PIO_WORKAROUND;
 447
 448         b43legacydbg(dev->wl, "PIO initialized\n");
 449         err = 0;
 450 out:
 451         return err;
 452
 453 err_destroy2:
 454         b43legacy_destroy_pioqueue(pio->queue2);
 455         pio->queue2 = NULL;
 456 err_destroy1:
 457         b43legacy_destroy_pioqueue(pio->queue1);
 458         pio->queue1 = NULL;
 459 err_destroy0:
 460         b43legacy_destroy_pioqueue(pio->queue0);
 461         pio->queue0 = NULL;
 462         goto out;
 463 }
 464
 465 int b43legacy_pio_tx(struct b43legacy_wldev *dev,
 466                      struct sk_buff *skb)
 467 {
 468         struct b43legacy_pioqueue *queue = dev->pio.queue1;
 469         struct b43legacy_pio_txpacket *packet;
 470
 471         B43legacy_WARN_ON(queue->tx_suspended);
 472         B43legacy_WARN_ON(list_empty(&queue->txfree));
 473
 474         packet = list_entry(queue->txfree.next, struct b43legacy_pio_txpacket,
 475                             list);
 476         packet->skb = skb;
 477
 478         list_move_tail(&packet->list, &queue->txqueue);
 479         queue->nr_txfree--;
 480         queue->nr_tx_packets++;
 481         B43legacy_WARN_ON(queue->nr_txfree >= B43legacy_PIO_MAXTXPACKETS);
 482
 483         tasklet_schedule(&queue->txtask);
 484
 485         return 0;
 486 }
 487
 488 void b43legacy_pio_handle_txstatus(struct b43legacy_wldev *dev,
 489                                    const struct b43legacy_txstatus *status)
 490 {
 491         struct b43legacy_pioqueue *queue;
 492         struct b43legacy_pio_txpacket *packet;
 493         struct ieee80211_tx_info *info;
 494         int retry_limit;
 495
 496         queue = parse_cookie(dev, status->cookie, &packet);
 497         B43legacy_WARN_ON(!queue);
 498
 499         if (!packet->skb)
 500                 return;
 501
 502         queue->tx_devq_packets--;
 503         queue->tx_devq_used -= (packet->skb->len +
 504                                 sizeof(struct b43legacy_txhdr_fw3));
 505
 506         info = IEEE80211_SKB_CB(packet->skb);
 507
 508         /* preserve the confiured retry limit before clearing the status
 509          * The xmit function has overwritten the rc's value with the actual
 510          * retry limit done by the hardware */
 511         retry_limit = info->status.rates[0].count;
 512         ieee80211_tx_info_clear_status(info);
 513
 514         if (status->acked)
 515                 info->flags |= IEEE80211_TX_STAT_ACK;
 516
 517         if (status->rts_count > dev->wl->hw->conf.short_frame_max_tx_count) {
 518                 /*
 519                  * If the short retries (RTS, not data frame) have exceeded
 520                  * the limit, the hw will not have tried the selected rate,
 521                  * but will have used the fallback rate instead.
 522                  * Don't let the rate control count attempts for the selected
 523                  * rate in this case, otherwise the statistics will be off.
 524                  */
 525                 info->status.rates[0].count = 0;
 526                 info->status.rates[1].count = status->frame_count;
 527         } else {
 528                 if (status->frame_count > retry_limit) {
 529                         info->status.rates[0].count = retry_limit;
 530                         info->status.rates[1].count = status->frame_count -
 531                                         retry_limit;
 532
 533                 } else {
 534                         info->status.rates[0].count = status->frame_count;
 535                         info->status.rates[1].idx = -1;
 536                 }
 537         }
 538         ieee80211_tx_status_irqsafe(dev->wl->hw, packet->skb);
 539         packet->skb = NULL;
 540
 541         free_txpacket(packet, 1);
 542         /* If there are packets on the txqueue, poke the tasklet
 543          * to transmit them.
 544          */
 545         if (!list_empty(&queue->txqueue))
 546                 tasklet_schedule(&queue->txtask);
 547 }
 548
 549 void b43legacy_pio_get_tx_stats(struct b43legacy_wldev *dev,
 550                                 struct ieee80211_tx_queue_stats *stats)
 551 {
 552         struct b43legacy_pio *pio = &dev->pio;
 553         struct b43legacy_pioqueue *queue;
 554
 555         queue = pio->queue1;
 556         stats[0].len = B43legacy_PIO_MAXTXPACKETS - queue->nr_txfree;
 557         stats[0].limit = B43legacy_PIO_MAXTXPACKETS;
 558         stats[0].count = queue->nr_tx_packets;
 559 }
 560
 561 static void pio_rx_error(struct b43legacy_pioqueue *queue,
 562                          int clear_buffers,
 563                          const char *error)
 564 {
 565         int i;
 566
 567         b43legacyerr(queue->dev->wl, "PIO RX error: %s\n", error);
 568         b43legacy_pio_write(queue, B43legacy_PIO_RXCTL,
 569                             B43legacy_PIO_RXCTL_READY);
 570         if (clear_buffers) {
 571                 B43legacy_WARN_ON(queue->mmio_base != B43legacy_MMIO_PIO1_BASE);
 572                 for (i = 0; i < 15; i++) {
 573                         /* Dummy read. */
 574                         b43legacy_pio_read(queue, B43legacy_PIO_RXDATA);
 575                 }
 576         }
 577 }
 578
 579 void b43legacy_pio_rx(struct b43legacy_pioqueue *queue)
 580 {
 581         __le16 preamble[21] = { 0 };
 582         struct b43legacy_rxhdr_fw3 *rxhdr;
 583         u16 tmp;
 584         u16 len;
 585         u16 macstat;
 586         int i;
 587         int preamble_readwords;
 588         struct sk_buff *skb;
 589
 590         tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXCTL);
 591         if (!(tmp & B43legacy_PIO_RXCTL_DATAAVAILABLE))
 592                 return;
 593         b43legacy_pio_write(queue, B43legacy_PIO_RXCTL,
 594                             B43legacy_PIO_RXCTL_DATAAVAILABLE);
 595
 596         for (i = 0; i < 10; i++) {
 597                 tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXCTL);
 598                 if (tmp & B43legacy_PIO_RXCTL_READY)
 599                         goto data_ready;
 600                 udelay(10);
 601         }
 602         b43legacydbg(queue->dev->wl, "PIO RX timed out\n");
 603         return;
 604 data_ready:
 605
 606         len = b43legacy_pio_read(queue, B43legacy_PIO_RXDATA);
 607         if (unlikely(len > 0x700)) {
 608                 pio_rx_error(queue, 0, "len > 0x700");
 609                 return;
 610         }
 611         if (unlikely(len == 0 && queue->mmio_base !=
 612                      B43legacy_MMIO_PIO4_BASE)) {
 613                 pio_rx_error(queue, 0, "len == 0");
 614                 return;
 615         }
 616         preamble[0] = cpu_to_le16(len);
 617         if (queue->mmio_base == B43legacy_MMIO_PIO4_BASE)
 618                 preamble_readwords = 14 / sizeof(u16);
 619         else
 620                 preamble_readwords = 18 / sizeof(u16);
 621         for (i = 0; i < preamble_readwords; i++) {
 622                 tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXDATA);
 623                 preamble[i + 1] = cpu_to_le16(tmp);
 624         }
 625         rxhdr = (struct b43legacy_rxhdr_fw3 *)preamble;
 626         macstat = le16_to_cpu(rxhdr->mac_status);
 627         if (macstat & B43legacy_RX_MAC_FCSERR) {
 628                 pio_rx_error(queue,
 629                              (queue->mmio_base == B43legacy_MMIO_PIO1_BASE),
 630                              "Frame FCS error");
 631                 return;
 632         }
 633         if (queue->mmio_base == B43legacy_MMIO_PIO4_BASE) {
 634                 /* We received an xmit status. */
 635                 struct b43legacy_hwtxstatus *hw;
 636
 637                 hw = (struct b43legacy_hwtxstatus *)(preamble + 1);
 638                 b43legacy_handle_hwtxstatus(queue->dev, hw);
 639
 640                 return;
 641         }
 642
 643         skb = dev_alloc_skb(len);
 644         if (unlikely(!skb)) {
 645                 pio_rx_error(queue, 1, "OOM");
 646                 return;
 647         }
 648         skb_put(skb, len);
 649         for (i = 0; i < len - 1; i += 2) {
 650                 tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXDATA);
 651                 *((__le16 *)(skb->data + i)) = cpu_to_le16(tmp);
 652         }
 653         if (len % 2) {
 654                 tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXDATA);
 655                 skb->data[len - 1] = (tmp & 0x00FF);
 656         }
 657         b43legacy_rx(queue->dev, skb, rxhdr);
 658 }
 659
 660 void b43legacy_pio_tx_suspend(struct b43legacy_pioqueue *queue)
 661 {
 662         b43legacy_power_saving_ctl_bits(queue->dev, -1, 1);
 663         b43legacy_pio_write(queue, B43legacy_PIO_TXCTL,
 664                             b43legacy_pio_read(queue, B43legacy_PIO_TXCTL)
 665                             | B43legacy_PIO_TXCTL_SUSPEND);
 666 }
 667
 668 void b43legacy_pio_tx_resume(struct b43legacy_pioqueue *queue)
 669 {
 670         b43legacy_pio_write(queue, B43legacy_PIO_TXCTL,
 671                             b43legacy_pio_read(queue, B43legacy_PIO_TXCTL)
 672                             & ~B43legacy_PIO_TXCTL_SUSPEND);
 673         b43legacy_power_saving_ctl_bits(queue->dev, -1, -1);
 674         tasklet_schedule(&queue->txtask);
 675 }
 676
 677 void b43legacy_pio_freeze_txqueues(struct b43legacy_wldev *dev)
 678 {
 679         struct b43legacy_pio *pio;
 680
 681         B43legacy_WARN_ON(!b43legacy_using_pio(dev));
 682         pio = &dev->pio;
 683         pio->queue0->tx_frozen = 1;
 684         pio->queue1->tx_frozen = 1;
 685         pio->queue2->tx_frozen = 1;
 686         pio->queue3->tx_frozen = 1;
 687 }
 688
 689 void b43legacy_pio_thaw_txqueues(struct b43legacy_wldev *dev)
 690 {
 691         struct b43legacy_pio *pio;
 692
 693         B43legacy_WARN_ON(!b43legacy_using_pio(dev));
 694         pio = &dev->pio;
 695         pio->queue0->tx_frozen = 0;
 696         pio->queue1->tx_frozen = 0;
 697         pio->queue2->tx_frozen = 0;
 698         pio->queue3->tx_frozen = 0;
 699         if (!list_empty(&pio->queue0->txqueue))
 700                 tasklet_schedule(&pio->queue0->txtask);
 701         if (!list_empty(&pio->queue1->txqueue))
 702                 tasklet_schedule(&pio->queue1->txtask);
 703         if (!list_empty(&pio->queue2->txqueue))
 704                 tasklet_schedule(&pio->queue2->txtask);
 705         if (!list_empty(&pio->queue3->txqueue))
 706                 tasklet_schedule(&pio->queue3->txtask);
 707 }