drivers/net/wireless/bcm43xx/bcm43xx_pio.c

   1 /*
   2
   3   Broadcom BCM43xx wireless driver
   4
   5   PIO Transmission
   6
   7   Copyright (c) 2005 Michael Buesch <mbuesch@freenet.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 "bcm43xx.h"
  27 #include "bcm43xx_pio.h"
  28 #include "bcm43xx_main.h"
  29 #include "bcm43xx_xmit.h"
  30 #include "bcm43xx_power.h"
  31
  32 #include <linux/delay.h>
  33
  34
  35 static void tx_start(struct bcm43xx_pioqueue *queue)
  36 {
  37         bcm43xx_pio_write(queue, BCM43xx_PIO_TXCTL,
  38                           BCM43xx_PIO_TXCTL_INIT);
  39 }
  40
  41 static void tx_octet(struct bcm43xx_pioqueue *queue,
  42                      u8 octet)
  43 {
  44         if (queue->need_workarounds) {
  45                 bcm43xx_pio_write(queue, BCM43xx_PIO_TXDATA,
  46                                   octet);
  47                 bcm43xx_pio_write(queue, BCM43xx_PIO_TXCTL,
  48                                   BCM43xx_PIO_TXCTL_WRITELO);
  49         } else {
  50                 bcm43xx_pio_write(queue, BCM43xx_PIO_TXCTL,
  51                                   BCM43xx_PIO_TXCTL_WRITELO);
  52                 bcm43xx_pio_write(queue, BCM43xx_PIO_TXDATA,
  53                                   octet);
  54         }
  55 }
  56
  57 static u16 tx_get_next_word(struct bcm43xx_txhdr *txhdr,
  58                             const u8 *packet,
  59                             unsigned int *pos)
  60 {
  61         const u8 *source;
  62         unsigned int i = *pos;
  63         u16 ret;
  64
  65         if (i < sizeof(*txhdr)) {
  66                 source = (const u8 *)txhdr;
  67         } else {
  68                 source = packet;
  69                 i -= sizeof(*txhdr);
  70         }
  71         ret = le16_to_cpu( *((u16 *)(source + i)) );
  72         *pos += 2;
  73
  74         return ret;
  75 }
  76
  77 static void tx_data(struct bcm43xx_pioqueue *queue,
  78                     struct bcm43xx_txhdr *txhdr,
  79                     const u8 *packet,
  80                     unsigned int octets)
  81 {
  82         u16 data;
  83         unsigned int i = 0;
  84
  85         if (queue->need_workarounds) {
  86                 data = tx_get_next_word(txhdr, packet, &i);
  87                 bcm43xx_pio_write(queue, BCM43xx_PIO_TXDATA, data);
  88         }
  89         bcm43xx_pio_write(queue, BCM43xx_PIO_TXCTL,
  90                           BCM43xx_PIO_TXCTL_WRITELO |
  91                           BCM43xx_PIO_TXCTL_WRITEHI);
  92         while (i < octets - 1) {
  93                 data = tx_get_next_word(txhdr, packet, &i);
  94                 bcm43xx_pio_write(queue, BCM43xx_PIO_TXDATA, data);
  95         }
  96         if (octets % 2)
  97                 tx_octet(queue, packet[octets - sizeof(*txhdr) - 1]);
  98 }
  99
 100 static void tx_complete(struct bcm43xx_pioqueue *queue,
 101                         struct sk_buff *skb)
 102 {
 103         if (queue->need_workarounds) {
 104                 bcm43xx_pio_write(queue, BCM43xx_PIO_TXDATA,
 105                                   skb->data[skb->len - 1]);
 106                 bcm43xx_pio_write(queue, BCM43xx_PIO_TXCTL,
 107                                   BCM43xx_PIO_TXCTL_WRITELO |
 108                                   BCM43xx_PIO_TXCTL_COMPLETE);
 109         } else {
 110                 bcm43xx_pio_write(queue, BCM43xx_PIO_TXCTL,
 111                                   BCM43xx_PIO_TXCTL_COMPLETE);
 112         }
 113 }
 114
 115 static u16 generate_cookie(struct bcm43xx_pioqueue *queue,
 116                            struct bcm43xx_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 BCM43xx_MMIO_PIO1_BASE:
 127                 break;
 128         case BCM43xx_MMIO_PIO2_BASE:
 129                 cookie = 0x1000;
 130                 break;
 131         case BCM43xx_MMIO_PIO3_BASE:
 132                 cookie = 0x2000;
 133                 break;
 134         case BCM43xx_MMIO_PIO4_BASE:
 135                 cookie = 0x3000;
 136                 break;
 137         default:
 138                 assert(0);
 139         }
 140         packetindex = pio_txpacket_getindex(packet);
 141         assert(((u16)packetindex & 0xF000) == 0x0000);
 142         cookie |= (u16)packetindex;
 143
 144         return cookie;
 145 }
 146
 147 static
 148 struct bcm43xx_pioqueue * parse_cookie(struct bcm43xx_private *bcm,
 149                                        u16 cookie,
 150                                        struct bcm43xx_pio_txpacket **packet)
 151 {
 152         struct bcm43xx_pio *pio = bcm43xx_current_pio(bcm);
 153         struct bcm43xx_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                 assert(0);
 171         }
 172         packetindex = (cookie & 0x0FFF);
 173         assert(packetindex >= 0 && packetindex < BCM43xx_PIO_MAXTXPACKETS);
 174         *packet = &(queue->tx_packets_cache[packetindex]);
 175
 176         return queue;
 177 }
 178
 179 static void pio_tx_write_fragment(struct bcm43xx_pioqueue *queue,
 180                                   struct sk_buff *skb,
 181                                   struct bcm43xx_pio_txpacket *packet)
 182 {
 183         struct bcm43xx_txhdr txhdr;
 184         unsigned int octets;
 185
 186         assert(skb_shinfo(skb)->nr_frags == 0);
 187         bcm43xx_generate_txhdr(queue->bcm,
 188                                &txhdr, skb->data, skb->len,
 189                                (packet->xmitted_frags == 0),
 190                                generate_cookie(queue, packet));
 191
 192         tx_start(queue);
 193         octets = skb->len + sizeof(txhdr);
 194         if (queue->need_workarounds)
 195                 octets--;
 196         tx_data(queue, &txhdr, (u8 *)skb->data, octets);
 197         tx_complete(queue, skb);
 198 }
 199
 200 static void free_txpacket(struct bcm43xx_pio_txpacket *packet,
 201                           int irq_context)
 202 {
 203         struct bcm43xx_pioqueue *queue = packet->queue;
 204
 205         ieee80211_txb_free(packet->txb);
 206         list_move(&packet->list, &queue->txfree);
 207         queue->nr_txfree++;
 208
 209         assert(queue->tx_devq_used >= packet->xmitted_octets);
 210         assert(queue->tx_devq_packets >= packet->xmitted_frags);
 211         queue->tx_devq_used -= packet->xmitted_octets;
 212         queue->tx_devq_packets -= packet->xmitted_frags;
 213 }
 214
 215 static int pio_tx_packet(struct bcm43xx_pio_txpacket *packet)
 216 {
 217         struct bcm43xx_pioqueue *queue = packet->queue;
 218         struct ieee80211_txb *txb = packet->txb;
 219         struct sk_buff *skb;
 220         u16 octets;
 221         int i;
 222
 223         for (i = packet->xmitted_frags; i < txb->nr_frags; i++) {
 224                 skb = txb->fragments[i];
 225
 226                 octets = (u16)skb->len + sizeof(struct bcm43xx_txhdr);
 227                 assert(queue->tx_devq_size >= octets);
 228                 assert(queue->tx_devq_packets <= BCM43xx_PIO_MAXTXDEVQPACKETS);
 229                 assert(queue->tx_devq_used <= queue->tx_devq_size);
 230                 /* Check if there is sufficient free space on the device
 231                  * TX queue. If not, return and let the TX tasklet
 232                  * retry later.
 233                  */
 234                 if (queue->tx_devq_packets == BCM43xx_PIO_MAXTXDEVQPACKETS)
 235                         return -EBUSY;
 236                 if (queue->tx_devq_used + octets > queue->tx_devq_size)
 237                         return -EBUSY;
 238                 /* Now poke the device. */
 239                 pio_tx_write_fragment(queue, skb, packet);
 240
 241                 /* Account for the packet size.
 242                  * (We must not overflow the device TX queue)
 243                  */
 244                 queue->tx_devq_packets++;
 245                 queue->tx_devq_used += octets;
 246
 247                 assert(packet->xmitted_frags < packet->txb->nr_frags);
 248                 packet->xmitted_frags++;
 249                 packet->xmitted_octets += octets;
 250         }
 251         list_move_tail(&packet->list, &queue->txrunning);
 252
 253         return 0;
 254 }
 255
 256 static void tx_tasklet(unsigned long d)
 257 {
 258         struct bcm43xx_pioqueue *queue = (struct bcm43xx_pioqueue *)d;
 259         struct bcm43xx_private *bcm = queue->bcm;
 260         unsigned long flags;
 261         struct bcm43xx_pio_txpacket *packet, *tmp_packet;
 262         int err;
 263         u16 txctl;
 264
 265         bcm43xx_lock_mmio(bcm, flags);
 266
 267         txctl = bcm43xx_pio_read(queue, BCM43xx_PIO_TXCTL);
 268         if (txctl & BCM43xx_PIO_TXCTL_SUSPEND)
 269                 goto out_unlock;
 270
 271         list_for_each_entry_safe(packet, tmp_packet, &queue->txqueue, list) {
 272                 assert(packet->xmitted_frags < packet->txb->nr_frags);
 273                 if (packet->xmitted_frags == 0) {
 274                         int i;
 275                         struct sk_buff *skb;
 276
 277                         /* Check if the device queue is big
 278                          * enough for every fragment. If not, drop the
 279                          * whole packet.
 280                          */
 281                         for (i = 0; i < packet->txb->nr_frags; i++) {
 282                                 skb = packet->txb->fragments[i];
 283                                 if (unlikely(skb->len > queue->tx_devq_size)) {
 284                                         dprintkl(KERN_ERR PFX "PIO TX device queue too small. "
 285                                                               "Dropping packet.\n");
 286                                         free_txpacket(packet, 1);
 287                                         goto next_packet;
 288                                 }
 289                         }
 290                 }
 291                 /* Try to transmit the packet.
 292                  * This may not completely succeed.
 293                  */
 294                 err = pio_tx_packet(packet);
 295                 if (err)
 296                         break;
 297         next_packet:
 298                 continue;
 299         }
 300 out_unlock:
 301         bcm43xx_unlock_mmio(bcm, flags);
 302 }
 303
 304 static void setup_txqueues(struct bcm43xx_pioqueue *queue)
 305 {
 306         struct bcm43xx_pio_txpacket *packet;
 307         int i;
 308
 309         queue->nr_txfree = BCM43xx_PIO_MAXTXPACKETS;
 310         for (i = 0; i < BCM43xx_PIO_MAXTXPACKETS; i++) {
 311                 packet = &(queue->tx_packets_cache[i]);
 312
 313                 packet->queue = queue;
 314                 INIT_LIST_HEAD(&packet->list);
 315
 316                 list_add(&packet->list, &queue->txfree);
 317         }
 318 }
 319
 320 static
 321 struct bcm43xx_pioqueue * bcm43xx_setup_pioqueue(struct bcm43xx_private *bcm,
 322                                                  u16 pio_mmio_base)
 323 {
 324         struct bcm43xx_pioqueue *queue;
 325         u32 value;
 326         u16 qsize;
 327
 328         queue = kzalloc(sizeof(*queue), GFP_KERNEL);
 329         if (!queue)
 330                 goto out;
 331
 332         queue->bcm = bcm;
 333         queue->mmio_base = pio_mmio_base;
 334         queue->need_workarounds = (bcm->current_core->rev < 3);
 335
 336         INIT_LIST_HEAD(&queue->txfree);
 337         INIT_LIST_HEAD(&queue->txqueue);
 338         INIT_LIST_HEAD(&queue->txrunning);
 339         tasklet_init(&queue->txtask, tx_tasklet,
 340                      (unsigned long)queue);
 341
 342         value = bcm43xx_read32(bcm, BCM43xx_MMIO_STATUS_BITFIELD);
 343         value &= ~BCM43xx_SBF_XFER_REG_BYTESWAP;
 344         bcm43xx_write32(bcm, BCM43xx_MMIO_STATUS_BITFIELD, value);
 345
 346         qsize = bcm43xx_read16(bcm, queue->mmio_base + BCM43xx_PIO_TXQBUFSIZE);
 347         if (qsize == 0) {
 348                 printk(KERN_ERR PFX "ERROR: This card does not support PIO "
 349                                     "operation mode. Please use DMA mode "
 350                                     "(module parameter pio=0).\n");
 351                 goto err_freequeue;
 352         }
 353         if (qsize <= BCM43xx_PIO_TXQADJUST) {
 354                 printk(KERN_ERR PFX "PIO tx device-queue too small (%u)\n",
 355                        qsize);
 356                 goto err_freequeue;
 357         }
 358         qsize -= BCM43xx_PIO_TXQADJUST;
 359         queue->tx_devq_size = qsize;
 360
 361         setup_txqueues(queue);
 362
 363 out:
 364         return queue;
 365
 366 err_freequeue:
 367         kfree(queue);
 368         queue = NULL;
 369         goto out;
 370 }
 371
 372 static void cancel_transfers(struct bcm43xx_pioqueue *queue)
 373 {
 374         struct bcm43xx_pio_txpacket *packet, *tmp_packet;
 375
 376         netif_tx_disable(queue->bcm->net_dev);
 377         assert(queue->bcm->shutting_down);
 378         tasklet_disable(&queue->txtask);
 379
 380         list_for_each_entry_safe(packet, tmp_packet, &queue->txrunning, list)
 381                 free_txpacket(packet, 0);
 382         list_for_each_entry_safe(packet, tmp_packet, &queue->txqueue, list)
 383                 free_txpacket(packet, 0);
 384 }
 385
 386 static void bcm43xx_destroy_pioqueue(struct bcm43xx_pioqueue *queue)
 387 {
 388         if (!queue)
 389                 return;
 390
 391         cancel_transfers(queue);
 392         kfree(queue);
 393 }
 394
 395 void bcm43xx_pio_free(struct bcm43xx_private *bcm)
 396 {
 397         struct bcm43xx_pio *pio;
 398
 399         if (!bcm43xx_using_pio(bcm))
 400                 return;
 401         pio = bcm43xx_current_pio(bcm);
 402
 403         bcm43xx_destroy_pioqueue(pio->queue3);
 404         pio->queue3 = NULL;
 405         bcm43xx_destroy_pioqueue(pio->queue2);
 406         pio->queue2 = NULL;
 407         bcm43xx_destroy_pioqueue(pio->queue1);
 408         pio->queue1 = NULL;
 409         bcm43xx_destroy_pioqueue(pio->queue0);
 410         pio->queue0 = NULL;
 411 }
 412
 413 int bcm43xx_pio_init(struct bcm43xx_private *bcm)
 414 {
 415         struct bcm43xx_pio *pio = bcm43xx_current_pio(bcm);
 416         struct bcm43xx_pioqueue *queue;
 417         int err = -ENOMEM;
 418
 419         queue = bcm43xx_setup_pioqueue(bcm, BCM43xx_MMIO_PIO1_BASE);
 420         if (!queue)
 421                 goto out;
 422         pio->queue0 = queue;
 423
 424         queue = bcm43xx_setup_pioqueue(bcm, BCM43xx_MMIO_PIO2_BASE);
 425         if (!queue)
 426                 goto err_destroy0;
 427         pio->queue1 = queue;
 428
 429         queue = bcm43xx_setup_pioqueue(bcm, BCM43xx_MMIO_PIO3_BASE);
 430         if (!queue)
 431                 goto err_destroy1;
 432         pio->queue2 = queue;
 433
 434         queue = bcm43xx_setup_pioqueue(bcm, BCM43xx_MMIO_PIO4_BASE);
 435         if (!queue)
 436                 goto err_destroy2;
 437         pio->queue3 = queue;
 438
 439         if (bcm->current_core->rev < 3)
 440                 bcm->irq_savedstate |= BCM43xx_IRQ_PIO_WORKAROUND;
 441
 442         dprintk(KERN_INFO PFX "PIO initialized\n");
 443         err = 0;
 444 out:
 445         return err;
 446
 447 err_destroy2:
 448         bcm43xx_destroy_pioqueue(pio->queue2);
 449         pio->queue2 = NULL;
 450 err_destroy1:
 451         bcm43xx_destroy_pioqueue(pio->queue1);
 452         pio->queue1 = NULL;
 453 err_destroy0:
 454         bcm43xx_destroy_pioqueue(pio->queue0);
 455         pio->queue0 = NULL;
 456         goto out;
 457 }
 458
 459 int bcm43xx_pio_tx(struct bcm43xx_private *bcm,
 460                    struct ieee80211_txb *txb)
 461 {
 462         struct bcm43xx_pioqueue *queue = bcm43xx_current_pio(bcm)->queue1;
 463         struct bcm43xx_pio_txpacket *packet;
 464
 465         assert(!queue->tx_suspended);
 466         assert(!list_empty(&queue->txfree));
 467
 468         packet = list_entry(queue->txfree.next, struct bcm43xx_pio_txpacket, list);
 469         packet->txb = txb;
 470         packet->xmitted_frags = 0;
 471         packet->xmitted_octets = 0;
 472         list_move_tail(&packet->list, &queue->txqueue);
 473         queue->nr_txfree--;
 474         assert(queue->nr_txfree < BCM43xx_PIO_MAXTXPACKETS);
 475
 476         /* Suspend TX, if we are out of packets in the "free" queue. */
 477         if (list_empty(&queue->txfree)) {
 478                 netif_stop_queue(queue->bcm->net_dev);
 479                 queue->tx_suspended = 1;
 480         }
 481
 482         tasklet_schedule(&queue->txtask);
 483
 484         return 0;
 485 }
 486
 487 void bcm43xx_pio_handle_xmitstatus(struct bcm43xx_private *bcm,
 488                                    struct bcm43xx_xmitstatus *status)
 489 {
 490         struct bcm43xx_pioqueue *queue;
 491         struct bcm43xx_pio_txpacket *packet;
 492
 493         queue = parse_cookie(bcm, status->cookie, &packet);
 494         assert(queue);
 495
 496         free_txpacket(packet, 1);
 497         if (queue->tx_suspended) {
 498                 queue->tx_suspended = 0;
 499                 netif_wake_queue(queue->bcm->net_dev);
 500         }
 501         /* If there are packets on the txqueue, poke the tasklet
 502          * to transmit them.
 503          */
 504         if (!list_empty(&queue->txqueue))
 505                 tasklet_schedule(&queue->txtask);
 506 }
 507
 508 static void pio_rx_error(struct bcm43xx_pioqueue *queue,
 509                          int clear_buffers,
 510                          const char *error)
 511 {
 512         int i;
 513
 514         printkl("PIO RX error: %s\n", error);
 515         bcm43xx_pio_write(queue, BCM43xx_PIO_RXCTL,
 516                           BCM43xx_PIO_RXCTL_READY);
 517         if (clear_buffers) {
 518                 assert(queue->mmio_base == BCM43xx_MMIO_PIO1_BASE);
 519                 for (i = 0; i < 15; i++) {
 520                         /* Dummy read. */
 521                         bcm43xx_pio_read(queue, BCM43xx_PIO_RXDATA);
 522                 }
 523         }
 524 }
 525
 526 void bcm43xx_pio_rx(struct bcm43xx_pioqueue *queue)
 527 {
 528         u16 preamble[21] = { 0 };
 529         struct bcm43xx_rxhdr *rxhdr;
 530         u16 tmp, len, rxflags2;
 531         int i, preamble_readwords;
 532         struct sk_buff *skb;
 533
 534         tmp = bcm43xx_pio_read(queue, BCM43xx_PIO_RXCTL);
 535         if (!(tmp & BCM43xx_PIO_RXCTL_DATAAVAILABLE))
 536                 return;
 537         bcm43xx_pio_write(queue, BCM43xx_PIO_RXCTL,
 538                           BCM43xx_PIO_RXCTL_DATAAVAILABLE);
 539
 540         for (i = 0; i < 10; i++) {
 541                 tmp = bcm43xx_pio_read(queue, BCM43xx_PIO_RXCTL);
 542                 if (tmp & BCM43xx_PIO_RXCTL_READY)
 543                         goto data_ready;
 544                 udelay(10);
 545         }
 546         dprintkl(KERN_ERR PFX "PIO RX timed out\n");
 547         return;
 548 data_ready:
 549
 550         len = bcm43xx_pio_read(queue, BCM43xx_PIO_RXDATA);
 551         if (unlikely(len > 0x700)) {
 552                 pio_rx_error(queue, 0, "len > 0x700");
 553                 return;
 554         }
 555         if (unlikely(len == 0 && queue->mmio_base != BCM43xx_MMIO_PIO4_BASE)) {
 556                 pio_rx_error(queue, 0, "len == 0");
 557                 return;
 558         }
 559         preamble[0] = cpu_to_le16(len);
 560         if (queue->mmio_base == BCM43xx_MMIO_PIO4_BASE)
 561                 preamble_readwords = 14 / sizeof(u16);
 562         else
 563                 preamble_readwords = 18 / sizeof(u16);
 564         for (i = 0; i < preamble_readwords; i++) {
 565                 tmp = bcm43xx_pio_read(queue, BCM43xx_PIO_RXDATA);
 566                 preamble[i + 1] = cpu_to_le16(tmp);
 567         }
 568         rxhdr = (struct bcm43xx_rxhdr *)preamble;
 569         rxflags2 = le16_to_cpu(rxhdr->flags2);
 570         if (unlikely(rxflags2 & BCM43xx_RXHDR_FLAGS2_INVALIDFRAME)) {
 571                 pio_rx_error(queue,
 572                              (queue->mmio_base == BCM43xx_MMIO_PIO1_BASE),
 573                              "invalid frame");
 574                 return;
 575         }
 576         if (queue->mmio_base == BCM43xx_MMIO_PIO4_BASE) {
 577                 /* We received an xmit status. */
 578                 struct bcm43xx_hwxmitstatus *hw;
 579                 struct bcm43xx_xmitstatus stat;
 580
 581                 hw = (struct bcm43xx_hwxmitstatus *)(preamble + 1);
 582                 stat.cookie = le16_to_cpu(hw->cookie);
 583                 stat.flags = hw->flags;
 584                 stat.cnt1 = hw->cnt1;
 585                 stat.cnt2 = hw->cnt2;
 586                 stat.seq = le16_to_cpu(hw->seq);
 587                 stat.unknown = le16_to_cpu(hw->unknown);
 588
 589                 bcm43xx_debugfs_log_txstat(queue->bcm, &stat);
 590                 bcm43xx_pio_handle_xmitstatus(queue->bcm, &stat);
 591
 592                 return;
 593         }
 594
 595         skb = dev_alloc_skb(len);
 596         if (unlikely(!skb)) {
 597                 pio_rx_error(queue, 1, "OOM");
 598                 return;
 599         }
 600         skb_put(skb, len);
 601         for (i = 0; i < len - 1; i += 2) {
 602                 tmp = bcm43xx_pio_read(queue, BCM43xx_PIO_RXDATA);
 603                 *((u16 *)(skb->data + i)) = cpu_to_le16(tmp);
 604         }
 605         if (len % 2) {
 606                 tmp = bcm43xx_pio_read(queue, BCM43xx_PIO_RXDATA);
 607                 skb->data[len - 1] = (tmp & 0x00FF);
 608 /* The specs say the following is required, but
 609  * it is wrong and corrupts the PLCP. If we don't do
 610  * this, the PLCP seems to be correct. So ifdef it out for now.
 611  */
 612 #if 0
 613                 if (rxflags2 & BCM43xx_RXHDR_FLAGS2_TYPE2FRAME)
 614                         skb->data[2] = (tmp & 0xFF00) >> 8;
 615                 else
 616                         skb->data[0] = (tmp & 0xFF00) >> 8;
 617 #endif
 618         }
 619         skb_trim(skb, len - IEEE80211_FCS_LEN);
 620         bcm43xx_rx(queue->bcm, skb, rxhdr);
 621 }
 622
 623 void bcm43xx_pio_tx_suspend(struct bcm43xx_pioqueue *queue)
 624 {
 625         bcm43xx_power_saving_ctl_bits(queue->bcm, -1, 1);
 626         bcm43xx_pio_write(queue, BCM43xx_PIO_TXCTL,
 627                           bcm43xx_pio_read(queue, BCM43xx_PIO_TXCTL)
 628                           | BCM43xx_PIO_TXCTL_SUSPEND);
 629 }
 630
 631 void bcm43xx_pio_tx_resume(struct bcm43xx_pioqueue *queue)
 632 {
 633         bcm43xx_pio_write(queue, BCM43xx_PIO_TXCTL,
 634                           bcm43xx_pio_read(queue, BCM43xx_PIO_TXCTL)
 635                           & ~BCM43xx_PIO_TXCTL_SUSPEND);
 636         bcm43xx_power_saving_ctl_bits(queue->bcm, -1, -1);
 637         tasklet_schedule(&queue->txtask);
 638 }