drivers/net/wireless/ath/ath6kl/htc.h

   1 /*
   2  * Copyright (c) 2004-2011 Atheros Communications Inc.
   3  * Copyright (c) 2011 Qualcomm Atheros, Inc.
   4  *
   5  * Permission to use, copy, modify, and/or distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 #ifndef HTC_H
  19 #define HTC_H
  20
  21 #include "common.h"
  22
  23 /* frame header flags */
  24
  25 /* send direction */
  26 #define HTC_FLAGS_NEED_CREDIT_UPDATE (1 << 0)
  27 #define HTC_FLAGS_SEND_BUNDLE        (1 << 1)
  28 #define HTC_FLAGS_TX_FIXUP_NETBUF    (1 << 2)
  29
  30 /* receive direction */
  31 #define HTC_FLG_RX_UNUSED        (1 << 0)
  32 #define HTC_FLG_RX_TRAILER       (1 << 1)
  33 /* Bundle count maske and shift */
  34 #define HTC_FLG_RX_BNDL_CNT      (0xF0)
  35 #define HTC_FLG_RX_BNDL_CNT_S    4
  36
  37 #define HTC_HDR_LENGTH  (sizeof(struct htc_frame_hdr))
  38 #define HTC_MAX_PAYLOAD_LENGTH   (4096 - sizeof(struct htc_frame_hdr))
  39
  40 /* HTC control message IDs */
  41
  42 #define HTC_MSG_READY_ID                1
  43 #define HTC_MSG_CONN_SVC_ID             2
  44 #define HTC_MSG_CONN_SVC_RESP_ID        3
  45 #define HTC_MSG_SETUP_COMPLETE_ID       4
  46 #define HTC_MSG_SETUP_COMPLETE_EX_ID    5
  47
  48 #define HTC_MAX_CTRL_MSG_LEN  256
  49
  50 #define HTC_VERSION_2P0  0x00
  51 #define HTC_VERSION_2P1  0x01
  52
  53 #define HTC_SERVICE_META_DATA_MAX_LENGTH 128
  54
  55 #define HTC_CONN_FLGS_THRESH_LVL_QUAT           0x0
  56 #define HTC_CONN_FLGS_THRESH_LVL_HALF           0x1
  57 #define HTC_CONN_FLGS_THRESH_LVL_THREE_QUAT     0x2
  58 #define HTC_CONN_FLGS_REDUCE_CRED_DRIB          0x4
  59 #define HTC_CONN_FLGS_THRESH_MASK               0x3
  60 /* disable credit flow control on a specific service */
  61 #define HTC_CONN_FLGS_DISABLE_CRED_FLOW_CTRL          (1 << 3)
  62 #define HTC_CONN_FLGS_SET_RECV_ALLOC_SHIFT    8
  63 #define HTC_CONN_FLGS_SET_RECV_ALLOC_MASK     0xFF00U
  64
  65 /* connect response status codes */
  66 #define HTC_SERVICE_SUCCESS      0
  67 #define HTC_SERVICE_NOT_FOUND    1
  68 #define HTC_SERVICE_FAILED       2
  69
  70 /* no resources (i.e. no more endpoints) */
  71 #define HTC_SERVICE_NO_RESOURCES 3
  72
  73 /* specific service is not allowing any more endpoints */
  74 #define HTC_SERVICE_NO_MORE_EP   4
  75
  76 /* report record IDs */
  77 #define HTC_RECORD_NULL             0
  78 #define HTC_RECORD_CREDITS          1
  79 #define HTC_RECORD_LOOKAHEAD        2
  80 #define HTC_RECORD_LOOKAHEAD_BUNDLE 3
  81
  82 #define HTC_SETUP_COMP_FLG_RX_BNDL_EN     (1 << 0)
  83 #define HTC_SETUP_COMP_FLG_DISABLE_TX_CREDIT_FLOW (1 << 1)
  84
  85 #define MAKE_SERVICE_ID(group, index) \
  86         (int)(((int)group << 8) | (int)(index))
  87
  88 /* NOTE: service ID of 0x0000 is reserved and should never be used */
  89 #define HTC_CTRL_RSVD_SVC MAKE_SERVICE_ID(RSVD_SERVICE_GROUP, 1)
  90 #define WMI_CONTROL_SVC   MAKE_SERVICE_ID(WMI_SERVICE_GROUP, 0)
  91 #define WMI_DATA_BE_SVC   MAKE_SERVICE_ID(WMI_SERVICE_GROUP, 1)
  92 #define WMI_DATA_BK_SVC   MAKE_SERVICE_ID(WMI_SERVICE_GROUP, 2)
  93 #define WMI_DATA_VI_SVC   MAKE_SERVICE_ID(WMI_SERVICE_GROUP, 3)
  94 #define WMI_DATA_VO_SVC   MAKE_SERVICE_ID(WMI_SERVICE_GROUP, 4)
  95 #define WMI_MAX_SERVICES  5
  96
  97 #define WMM_NUM_AC  4
  98
  99 /* reserved and used to flush ALL packets */
 100 #define HTC_TX_PACKET_TAG_ALL          0
 101 #define HTC_SERVICE_TX_PACKET_TAG      1
 102 #define HTC_TX_PACKET_TAG_USER_DEFINED (HTC_SERVICE_TX_PACKET_TAG + 9)
 103
 104 /* more packets on this endpoint are being fetched */
 105 #define HTC_RX_FLAGS_INDICATE_MORE_PKTS  (1 << 0)
 106
 107 /* TODO.. for BMI */
 108 #define ENDPOINT1 0
 109 /* TODO -remove me, but we have to fix BMI first */
 110 #define HTC_MAILBOX_NUM_MAX    4
 111
 112 /* enable send bundle padding for this endpoint */
 113 #define HTC_FLGS_TX_BNDL_PAD_EN  (1 << 0)
 114 #define HTC_EP_ACTIVE                            ((u32) (1u << 31))
 115
 116 /* HTC operational parameters */
 117 #define HTC_TARGET_RESPONSE_TIMEOUT        2000 /* in ms */
 118 #define HTC_TARGET_RESPONSE_POLL_WAIT      10
 119 #define HTC_TARGET_RESPONSE_POLL_COUNT     200
 120 #define HTC_TARGET_DEBUG_INTR_MASK         0x01
 121 #define HTC_TARGET_CREDIT_INTR_MASK        0xF0
 122
 123 #define HTC_HOST_MAX_MSG_PER_BUNDLE        8
 124 #define HTC_MIN_HTC_MSGS_TO_BUNDLE         2
 125
 126 /* packet flags */
 127
 128 #define HTC_RX_PKT_IGNORE_LOOKAHEAD      (1 << 0)
 129 #define HTC_RX_PKT_REFRESH_HDR           (1 << 1)
 130 #define HTC_RX_PKT_PART_OF_BUNDLE        (1 << 2)
 131 #define HTC_RX_PKT_NO_RECYCLE            (1 << 3)
 132
 133 #define NUM_CONTROL_BUFFERS     8
 134 #define NUM_CONTROL_TX_BUFFERS  2
 135 #define NUM_CONTROL_RX_BUFFERS  (NUM_CONTROL_BUFFERS - NUM_CONTROL_TX_BUFFERS)
 136
 137 #define HTC_RECV_WAIT_BUFFERS        (1 << 0)
 138 #define HTC_OP_STATE_STOPPING        (1 << 0)
 139 #define HTC_OP_STATE_SETUP_COMPLETE  (1 << 1)
 140
 141 /*
 142  * The frame header length and message formats defined herein were selected
 143  * to accommodate optimal alignment for target processing. This reduces
 144  * code size and improves performance. Any changes to the header length may
 145  * alter the alignment and cause exceptions on the target. When adding to
 146  * the messagestructures insure that fields are properly aligned.
 147  */
 148
 149 /* HTC frame header
 150  *
 151  * NOTE: do not remove or re-arrange the fields, these are minimally
 152  * required to take advantage of 4-byte lookaheads in some hardware
 153  * implementations.
 154  */
 155 struct htc_frame_hdr {
 156         struct_group_tagged(htc_frame_look_ahead, header,
 157                 union {
 158                         struct {
 159                                 u8 eid;
 160                                 u8 flags;
 161
 162                                 /* length of data (including trailer) that follows the header */
 163                                 __le16 payld_len;
 164
 165                         };
 166                         u32 word;
 167                 };
 168         );
 169         /* end of 4-byte lookahead */
 170
 171         u8 ctrl[2];
 172 } __packed;
 173
 174 /* HTC ready message */
 175 struct htc_ready_msg {
 176         __le16 msg_id;
 177         __le16 cred_cnt;
 178         __le16 cred_sz;
 179         u8 max_ep;
 180         u8 pad;
 181 } __packed;
 182
 183 /* extended HTC ready message */
 184 struct htc_ready_ext_msg {
 185         struct htc_ready_msg ver2_0_info;
 186         u8 htc_ver;
 187         u8 msg_per_htc_bndl;
 188 } __packed;
 189
 190 /* connect service */
 191 struct htc_conn_service_msg {
 192         __le16 msg_id;
 193         __le16 svc_id;
 194         __le16 conn_flags;
 195         u8 svc_meta_len;
 196         u8 pad;
 197 } __packed;
 198
 199 /* connect response */
 200 struct htc_conn_service_resp {
 201         __le16 msg_id;
 202         __le16 svc_id;
 203         u8 status;
 204         u8 eid;
 205         __le16 max_msg_sz;
 206         u8 svc_meta_len;
 207         u8 pad;
 208 } __packed;
 209
 210 struct htc_setup_comp_msg {
 211         __le16 msg_id;
 212 } __packed;
 213
 214 /* extended setup completion message */
 215 struct htc_setup_comp_ext_msg {
 216         __le16 msg_id;
 217         __le32 flags;
 218         u8 msg_per_rxbndl;
 219         u8 Rsvd[3];
 220 } __packed;
 221
 222 struct htc_record_hdr {
 223         u8 rec_id;
 224         u8 len;
 225 } __packed;
 226
 227 struct htc_credit_report {
 228         u8 eid;
 229         u8 credits;
 230 } __packed;
 231
 232 /*
 233  * NOTE: The lk_ahd array is guarded by a pre_valid
 234  * and Post Valid guard bytes. The pre_valid bytes must
 235  * equal the inverse of the post_valid byte.
 236  */
 237 struct htc_lookahead_report {
 238         u8 pre_valid;
 239         u8 lk_ahd[4];
 240         u8 post_valid;
 241 } __packed;
 242
 243 struct htc_bundle_lkahd_rpt {
 244         u8 lk_ahd[4];
 245 } __packed;
 246
 247 /* Current service IDs */
 248
 249 enum htc_service_grp_ids {
 250         RSVD_SERVICE_GROUP = 0,
 251         WMI_SERVICE_GROUP = 1,
 252
 253         HTC_TEST_GROUP = 254,
 254         HTC_SERVICE_GROUP_LAST = 255
 255 };
 256
 257 /* ------ endpoint IDS ------ */
 258
 259 enum htc_endpoint_id {
 260         ENDPOINT_UNUSED = -1,
 261         ENDPOINT_0 = 0,
 262         ENDPOINT_1 = 1,
 263         ENDPOINT_2 = 2,
 264         ENDPOINT_3,
 265         ENDPOINT_4,
 266         ENDPOINT_5,
 267         ENDPOINT_6,
 268         ENDPOINT_7,
 269         ENDPOINT_8,
 270         ENDPOINT_MAX,
 271 };
 272
 273 struct htc_tx_packet_info {
 274         u16 tag;
 275         int cred_used;
 276         u8 flags;
 277         int seqno;
 278 };
 279
 280 struct htc_rx_packet_info {
 281         u32 exp_hdr;
 282         u32 rx_flags;
 283         u32 indicat_flags;
 284 };
 285
 286 struct htc_target;
 287
 288 /* wrapper around endpoint-specific packets */
 289 struct htc_packet {
 290         struct list_head list;
 291
 292         /* caller's per packet specific context */
 293         void *pkt_cntxt;
 294
 295         /*
 296          * the true buffer start , the caller can store the real
 297          * buffer start here.  In receive callbacks, the HTC layer
 298          * sets buf to the start of the payload past the header.
 299          * This field allows the caller to reset buf when it recycles
 300          * receive packets back to HTC.
 301          */
 302         u8 *buf_start;
 303
 304         /*
 305          * Pointer to the start of the buffer. In the transmit
 306          * direction this points to the start of the payload. In the
 307          * receive direction, however, the buffer when queued up
 308          * points to the start of the HTC header but when returned
 309          * to the caller points to the start of the payload
 310          */
 311         u8 *buf;
 312         u32 buf_len;
 313
 314         /* actual length of payload */
 315         u32 act_len;
 316
 317         /* endpoint that this packet was sent/recv'd from */
 318         enum htc_endpoint_id endpoint;
 319
 320         /* completion status */
 321
 322         int status;
 323         union {
 324                 struct htc_tx_packet_info tx;
 325                 struct htc_rx_packet_info rx;
 326         } info;
 327
 328         void (*completion) (struct htc_target *, struct htc_packet *);
 329         struct htc_target *context;
 330
 331         /*
 332          * optimization for network-oriented data, the HTC packet
 333          * can pass the network buffer corresponding to the HTC packet
 334          * lower layers may optimized the transfer knowing this is
 335          * a network buffer
 336          */
 337         struct sk_buff *skb;
 338 };
 339
 340 enum htc_send_full_action {
 341         HTC_SEND_FULL_KEEP = 0,
 342         HTC_SEND_FULL_DROP = 1,
 343 };
 344
 345 struct htc_ep_callbacks {
 346         void (*tx_complete) (struct htc_target *, struct htc_packet *);
 347         void (*rx) (struct htc_target *, struct htc_packet *);
 348         void (*rx_refill) (struct htc_target *, enum htc_endpoint_id endpoint);
 349         enum htc_send_full_action (*tx_full) (struct htc_target *,
 350                                               struct htc_packet *);
 351         struct htc_packet *(*rx_allocthresh) (struct htc_target *,
 352                                               enum htc_endpoint_id, int);
 353         void (*tx_comp_multi) (struct htc_target *, struct list_head *);
 354         int rx_alloc_thresh;
 355         int rx_refill_thresh;
 356 };
 357
 358 /* service connection information */
 359 struct htc_service_connect_req {
 360         u16 svc_id;
 361         u16 conn_flags;
 362         struct htc_ep_callbacks ep_cb;
 363         int max_txq_depth;
 364         u32 flags;
 365         unsigned int max_rxmsg_sz;
 366 };
 367
 368 /* service connection response information */
 369 struct htc_service_connect_resp {
 370         u8 buf_len;
 371         u8 act_len;
 372         enum htc_endpoint_id endpoint;
 373         unsigned int len_max;
 374         u8 resp_code;
 375 };
 376
 377 /* endpoint distributionstructure */
 378 struct htc_endpoint_credit_dist {
 379         struct list_head list;
 380
 381         /* Service ID (set by HTC) */
 382         u16 svc_id;
 383
 384         /* endpoint for this distributionstruct (set by HTC) */
 385         enum htc_endpoint_id endpoint;
 386
 387         u32 dist_flags;
 388
 389         /*
 390          * credits for normal operation, anything above this
 391          * indicates the endpoint is over-subscribed.
 392          */
 393         int cred_norm;
 394
 395         /* floor for credit distribution */
 396         int cred_min;
 397
 398         int cred_assngd;
 399
 400         /* current credits available */
 401         int credits;
 402
 403         /*
 404          * pending credits to distribute on this endpoint, this
 405          * is set by HTC when credit reports arrive.  The credit
 406          * distribution functions sets this to zero when it distributes
 407          * the credits.
 408          */
 409         int cred_to_dist;
 410
 411         /*
 412          * the number of credits that the current pending TX packet needs
 413          * to transmit. This is set by HTC when endpoint needs credits in
 414          * order to transmit.
 415          */
 416         int seek_cred;
 417
 418         /* size in bytes of each credit */
 419         int cred_sz;
 420
 421         /* credits required for a maximum sized messages */
 422         int cred_per_msg;
 423
 424         /* reserved for HTC use */
 425         struct htc_endpoint *htc_ep;
 426
 427         /*
 428          * current depth of TX queue , i.e. messages waiting for credits
 429          * This field is valid only when HTC_CREDIT_DIST_ACTIVITY_CHANGE
 430          * or HTC_CREDIT_DIST_SEND_COMPLETE is indicated on an endpoint
 431          * that has non-zero credits to recover.
 432          */
 433         int txq_depth;
 434 };
 435
 436 /*
 437  * credit distribution code that is passed into the distribution function,
 438  * there are mandatory and optional codes that must be handled
 439  */
 440 enum htc_credit_dist_reason {
 441         HTC_CREDIT_DIST_SEND_COMPLETE = 0,
 442         HTC_CREDIT_DIST_ACTIVITY_CHANGE = 1,
 443         HTC_CREDIT_DIST_SEEK_CREDITS,
 444 };
 445
 446 struct ath6kl_htc_credit_info {
 447         int total_avail_credits;
 448         int cur_free_credits;
 449
 450         /* list of lowest priority endpoints */
 451         struct list_head lowestpri_ep_dist;
 452 };
 453
 454 /* endpoint statistics */
 455 struct htc_endpoint_stats {
 456         /*
 457          * number of times the host set the credit-low flag in a send
 458          * message on this endpoint
 459          */
 460         u32 cred_low_indicate;
 461
 462         u32 tx_issued;
 463         u32 tx_pkt_bundled;
 464         u32 tx_bundles;
 465         u32 tx_dropped;
 466
 467         /* running count of total credit reports received for this endpoint */
 468         u32 tx_cred_rpt;
 469
 470         /* credit reports received from this endpoint's RX packets */
 471         u32 cred_rpt_from_rx;
 472
 473         /* credit reports received from RX packets of other endpoints */
 474         u32 cred_rpt_from_other;
 475
 476         /* credit reports received from endpoint 0 RX packets */
 477         u32 cred_rpt_ep0;
 478
 479         /* count of credits received via Rx packets on this endpoint */
 480         u32 cred_from_rx;
 481
 482         /* count of credits received via another endpoint */
 483         u32 cred_from_other;
 484
 485         /* count of credits received via another endpoint */
 486         u32 cred_from_ep0;
 487
 488         /* count of consummed credits */
 489         u32 cred_cosumd;
 490
 491         /* count of credits returned */
 492         u32 cred_retnd;
 493
 494         u32 rx_pkts;
 495
 496         /* count of lookahead records found in Rx msg */
 497         u32 rx_lkahds;
 498
 499         /* count of recv packets received in a bundle */
 500         u32 rx_bundl;
 501
 502         /* count of number of bundled lookaheads */
 503         u32 rx_bundle_lkahd;
 504
 505         /* count of the number of bundle indications from the HTC header */
 506         u32 rx_bundle_from_hdr;
 507
 508         /* the number of times the recv allocation threshold was hit */
 509         u32 rx_alloc_thresh_hit;
 510
 511         /* total number of bytes */
 512         u32 rxalloc_thresh_byte;
 513 };
 514
 515 struct htc_endpoint {
 516         enum htc_endpoint_id eid;
 517         u16 svc_id;
 518         struct list_head txq;
 519         struct list_head rx_bufq;
 520         struct htc_endpoint_credit_dist cred_dist;
 521         struct htc_ep_callbacks ep_cb;
 522         int max_txq_depth;
 523         int len_max;
 524         int tx_proc_cnt;
 525         int rx_proc_cnt;
 526         struct htc_target *target;
 527         u8 seqno;
 528         u32 conn_flags;
 529         struct htc_endpoint_stats ep_st;
 530         u16 tx_drop_packet_threshold;
 531
 532         struct {
 533                 u8 pipeid_ul;
 534                 u8 pipeid_dl;
 535                 struct list_head tx_lookup_queue;
 536                 bool tx_credit_flow_enabled;
 537         } pipe;
 538 };
 539
 540 struct htc_control_buffer {
 541         struct htc_packet packet;
 542         u8 *buf;
 543 };
 544
 545 struct htc_pipe_txcredit_alloc {
 546         u16 service_id;
 547         u8 credit_alloc;
 548 };
 549
 550 enum htc_send_queue_result {
 551         HTC_SEND_QUEUE_OK = 0,  /* packet was queued */
 552         HTC_SEND_QUEUE_DROP = 1,        /* this packet should be dropped */
 553 };
 554
 555 struct ath6kl_htc_ops {
 556         void* (*create)(struct ath6kl *ar);
 557         int (*wait_target)(struct htc_target *target);
 558         int (*start)(struct htc_target *target);
 559         int (*conn_service)(struct htc_target *target,
 560                             struct htc_service_connect_req *req,
 561                             struct htc_service_connect_resp *resp);
 562         int  (*tx)(struct htc_target *target, struct htc_packet *packet);
 563         void (*stop)(struct htc_target *target);
 564         void (*cleanup)(struct htc_target *target);
 565         void (*flush_txep)(struct htc_target *target,
 566                            enum htc_endpoint_id endpoint, u16 tag);
 567         void (*flush_rx_buf)(struct htc_target *target);
 568         void (*activity_changed)(struct htc_target *target,
 569                                  enum htc_endpoint_id endpoint,
 570                                  bool active);
 571         int (*get_rxbuf_num)(struct htc_target *target,
 572                              enum htc_endpoint_id endpoint);
 573         int (*add_rxbuf_multiple)(struct htc_target *target,
 574                                   struct list_head *pktq);
 575         int (*credit_setup)(struct htc_target *target,
 576                             struct ath6kl_htc_credit_info *cred_info);
 577         int (*tx_complete)(struct ath6kl *ar, struct sk_buff *skb);
 578         int (*rx_complete)(struct ath6kl *ar, struct sk_buff *skb, u8 pipe);
 579 };
 580
 581 struct ath6kl_device;
 582
 583 /* our HTC target state */
 584 struct htc_target {
 585         struct htc_endpoint endpoint[ENDPOINT_MAX];
 586
 587         /* contains struct htc_endpoint_credit_dist */
 588         struct list_head cred_dist_list;
 589
 590         struct list_head free_ctrl_txbuf;
 591         struct list_head free_ctrl_rxbuf;
 592         struct ath6kl_htc_credit_info *credit_info;
 593         int tgt_creds;
 594         unsigned int tgt_cred_sz;
 595
 596         /* protects free_ctrl_txbuf and free_ctrl_rxbuf */
 597         spinlock_t htc_lock;
 598
 599         /* FIXME: does this protext rx_bufq and endpoint structures or what? */
 600         spinlock_t rx_lock;
 601
 602         /* protects endpoint->txq */
 603         spinlock_t tx_lock;
 604
 605         struct ath6kl_device *dev;
 606         u32 htc_flags;
 607         u32 rx_st_flags;
 608         enum htc_endpoint_id ep_waiting;
 609         u8 htc_tgt_ver;
 610
 611         /* max messages per bundle for HTC */
 612         int msg_per_bndl_max;
 613
 614         u32 tx_bndl_mask;
 615         int rx_bndl_enable;
 616         int max_rx_bndl_sz;
 617         int max_tx_bndl_sz;
 618
 619         u32 block_sz;
 620         u32 block_mask;
 621
 622         int max_scat_entries;
 623         int max_xfer_szper_scatreq;
 624
 625         int chk_irq_status_cnt;
 626
 627         /* counts the number of Tx without bundling continously per AC */
 628         u32 ac_tx_count[WMM_NUM_AC];
 629
 630         struct {
 631                 struct htc_packet *htc_packet_pool;
 632                 u8 ctrl_response_buf[HTC_MAX_CTRL_MSG_LEN];
 633                 int ctrl_response_len;
 634                 bool ctrl_response_valid;
 635                 struct htc_pipe_txcredit_alloc txcredit_alloc[ENDPOINT_MAX];
 636         } pipe;
 637 };
 638
 639 int ath6kl_htc_rxmsg_pending_handler(struct htc_target *target,
 640                                      u32 msg_look_ahead, int *n_pkts);
 641
 642 static inline void set_htc_pkt_info(struct htc_packet *packet, void *context,
 643                                     u8 *buf, unsigned int len,
 644                                     enum htc_endpoint_id eid, u16 tag)
 645 {
 646         packet->pkt_cntxt = context;
 647         packet->buf = buf;
 648         packet->act_len = len;
 649         packet->endpoint = eid;
 650         packet->info.tx.tag = tag;
 651 }
 652
 653 static inline void htc_rxpkt_reset(struct htc_packet *packet)
 654 {
 655         packet->buf = packet->buf_start;
 656         packet->act_len = 0;
 657 }
 658
 659 static inline void set_htc_rxpkt_info(struct htc_packet *packet, void *context,
 660                                       u8 *buf, unsigned long len,
 661                                       enum htc_endpoint_id eid)
 662 {
 663         packet->pkt_cntxt = context;
 664         packet->buf = buf;
 665         packet->buf_start = buf;
 666         packet->buf_len = len;
 667         packet->endpoint = eid;
 668 }
 669
 670 static inline int get_queue_depth(struct list_head *queue)
 671 {
 672         struct list_head *tmp_list;
 673         int depth = 0;
 674
 675         list_for_each(tmp_list, queue)
 676             depth++;
 677
 678         return depth;
 679 }
 680
 681 void ath6kl_htc_pipe_attach(struct ath6kl *ar);
 682 void ath6kl_htc_mbox_attach(struct ath6kl *ar);
 683
 684 #endif