drivers/net/wireless/ath/ath9k/htc_hst.c

   1 /*
   2  * Copyright (c) 2010-2011 Atheros Communications Inc.
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16
  17 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  18
  19 #include "htc.h"
  20
  21 static int htc_issue_send(struct htc_target *target, struct sk_buff* skb,
  22                           u16 len, u8 flags, u8 epid)
  23
  24 {
  25         struct htc_frame_hdr *hdr;
  26         struct htc_endpoint *endpoint = &target->endpoint[epid];
  27         int status;
  28
  29         hdr = skb_push(skb, sizeof(struct htc_frame_hdr));
  30         hdr->endpoint_id = epid;
  31         hdr->flags = flags;
  32         hdr->payload_len = cpu_to_be16(len);
  33
  34         status = target->hif->send(target->hif_dev, endpoint->ul_pipeid, skb);
  35
  36         return status;
  37 }
  38
  39 static struct htc_endpoint *get_next_avail_ep(struct htc_endpoint *endpoint)
  40 {
  41         enum htc_endpoint_id avail_epid;
  42
  43         for (avail_epid = (ENDPOINT_MAX - 1); avail_epid > ENDPOINT0; avail_epid--)
  44                 if (endpoint[avail_epid].service_id == 0)
  45                         return &endpoint[avail_epid];
  46         return NULL;
  47 }
  48
  49 static u8 service_to_ulpipe(u16 service_id)
  50 {
  51         switch (service_id) {
  52         case WMI_CONTROL_SVC:
  53                 return 4;
  54         case WMI_BEACON_SVC:
  55         case WMI_CAB_SVC:
  56         case WMI_UAPSD_SVC:
  57         case WMI_MGMT_SVC:
  58         case WMI_DATA_VO_SVC:
  59         case WMI_DATA_VI_SVC:
  60         case WMI_DATA_BE_SVC:
  61         case WMI_DATA_BK_SVC:
  62                 return 1;
  63         default:
  64                 return 0;
  65         }
  66 }
  67
  68 static u8 service_to_dlpipe(u16 service_id)
  69 {
  70         switch (service_id) {
  71         case WMI_CONTROL_SVC:
  72                 return 3;
  73         case WMI_BEACON_SVC:
  74         case WMI_CAB_SVC:
  75         case WMI_UAPSD_SVC:
  76         case WMI_MGMT_SVC:
  77         case WMI_DATA_VO_SVC:
  78         case WMI_DATA_VI_SVC:
  79         case WMI_DATA_BE_SVC:
  80         case WMI_DATA_BK_SVC:
  81                 return 2;
  82         default:
  83                 return 0;
  84         }
  85 }
  86
  87 static void htc_process_target_rdy(struct htc_target *target,
  88                                    void *buf)
  89 {
  90         struct htc_endpoint *endpoint;
  91         struct htc_ready_msg *htc_ready_msg = (struct htc_ready_msg *) buf;
  92
  93         target->credit_size = be16_to_cpu(htc_ready_msg->credit_size);
  94
  95         endpoint = &target->endpoint[ENDPOINT0];
  96         endpoint->service_id = HTC_CTRL_RSVD_SVC;
  97         endpoint->max_msglen = HTC_MAX_CONTROL_MESSAGE_LENGTH;
  98         atomic_inc(&target->tgt_ready);
  99         complete(&target->target_wait);
 100 }
 101
 102 static void htc_process_conn_rsp(struct htc_target *target,
 103                                  struct htc_frame_hdr *htc_hdr)
 104 {
 105         struct htc_conn_svc_rspmsg *svc_rspmsg;
 106         struct htc_endpoint *endpoint, *tmp_endpoint = NULL;
 107         u16 service_id;
 108         u16 max_msglen;
 109         enum htc_endpoint_id epid, tepid;
 110
 111         svc_rspmsg = (struct htc_conn_svc_rspmsg *)
 112                 ((void *) htc_hdr + sizeof(struct htc_frame_hdr));
 113
 114         if (svc_rspmsg->status == HTC_SERVICE_SUCCESS) {
 115                 epid = svc_rspmsg->endpoint_id;
 116                 service_id = be16_to_cpu(svc_rspmsg->service_id);
 117                 max_msglen = be16_to_cpu(svc_rspmsg->max_msg_len);
 118                 endpoint = &target->endpoint[epid];
 119
 120                 for (tepid = (ENDPOINT_MAX - 1); tepid > ENDPOINT0; tepid--) {
 121                         tmp_endpoint = &target->endpoint[tepid];
 122                         if (tmp_endpoint->service_id == service_id) {
 123                                 tmp_endpoint->service_id = 0;
 124                                 break;
 125                         }
 126                 }
 127
 128                 if (tepid == ENDPOINT0)
 129                         return;
 130
 131                 endpoint->service_id = service_id;
 132                 endpoint->max_txqdepth = tmp_endpoint->max_txqdepth;
 133                 endpoint->ep_callbacks = tmp_endpoint->ep_callbacks;
 134                 endpoint->ul_pipeid = tmp_endpoint->ul_pipeid;
 135                 endpoint->dl_pipeid = tmp_endpoint->dl_pipeid;
 136                 endpoint->max_msglen = max_msglen;
 137                 target->conn_rsp_epid = epid;
 138                 complete(&target->cmd_wait);
 139         } else {
 140                 target->conn_rsp_epid = ENDPOINT_UNUSED;
 141         }
 142 }
 143
 144 static int htc_config_pipe_credits(struct htc_target *target)
 145 {
 146         struct sk_buff *skb;
 147         struct htc_config_pipe_msg *cp_msg;
 148         int ret;
 149         unsigned long time_left;
 150
 151         skb = alloc_skb(50 + sizeof(struct htc_frame_hdr), GFP_ATOMIC);
 152         if (!skb) {
 153                 dev_err(target->dev, "failed to allocate send buffer\n");
 154                 return -ENOMEM;
 155         }
 156         skb_reserve(skb, sizeof(struct htc_frame_hdr));
 157
 158         cp_msg = skb_put(skb, sizeof(struct htc_config_pipe_msg));
 159
 160         cp_msg->message_id = cpu_to_be16(HTC_MSG_CONFIG_PIPE_ID);
 161         cp_msg->pipe_id = USB_WLAN_TX_PIPE;
 162         cp_msg->credits = target->credits;
 163
 164         target->htc_flags |= HTC_OP_CONFIG_PIPE_CREDITS;
 165
 166         ret = htc_issue_send(target, skb, skb->len, 0, ENDPOINT0);
 167         if (ret)
 168                 goto err;
 169
 170         time_left = wait_for_completion_timeout(&target->cmd_wait, HZ);
 171         if (!time_left) {
 172                 dev_err(target->dev, "HTC credit config timeout\n");
 173                 return -ETIMEDOUT;
 174         }
 175
 176         return 0;
 177 err:
 178         kfree_skb(skb);
 179         return -EINVAL;
 180 }
 181
 182 static int htc_setup_complete(struct htc_target *target)
 183 {
 184         struct sk_buff *skb;
 185         struct htc_comp_msg *comp_msg;
 186         int ret = 0;
 187         unsigned long time_left;
 188
 189         skb = alloc_skb(50 + sizeof(struct htc_frame_hdr), GFP_ATOMIC);
 190         if (!skb) {
 191                 dev_err(target->dev, "failed to allocate send buffer\n");
 192                 return -ENOMEM;
 193         }
 194         skb_reserve(skb, sizeof(struct htc_frame_hdr));
 195
 196         comp_msg = skb_put(skb, sizeof(struct htc_comp_msg));
 197         comp_msg->msg_id = cpu_to_be16(HTC_MSG_SETUP_COMPLETE_ID);
 198
 199         target->htc_flags |= HTC_OP_START_WAIT;
 200
 201         ret = htc_issue_send(target, skb, skb->len, 0, ENDPOINT0);
 202         if (ret)
 203                 goto err;
 204
 205         time_left = wait_for_completion_timeout(&target->cmd_wait, HZ);
 206         if (!time_left) {
 207                 dev_err(target->dev, "HTC start timeout\n");
 208                 return -ETIMEDOUT;
 209         }
 210
 211         return 0;
 212
 213 err:
 214         kfree_skb(skb);
 215         return -EINVAL;
 216 }
 217
 218 /* HTC APIs */
 219
 220 int htc_init(struct htc_target *target)
 221 {
 222         int ret;
 223
 224         ret = htc_config_pipe_credits(target);
 225         if (ret)
 226                 return ret;
 227
 228         return htc_setup_complete(target);
 229 }
 230
 231 int htc_connect_service(struct htc_target *target,
 232                      struct htc_service_connreq *service_connreq,
 233                      enum htc_endpoint_id *conn_rsp_epid)
 234 {
 235         struct sk_buff *skb;
 236         struct htc_endpoint *endpoint;
 237         struct htc_conn_svc_msg *conn_msg;
 238         int ret;
 239         unsigned long time_left;
 240
 241         /* Find an available endpoint */
 242         endpoint = get_next_avail_ep(target->endpoint);
 243         if (!endpoint) {
 244                 dev_err(target->dev, "Endpoint is not available for service %d\n",
 245                         service_connreq->service_id);
 246                 return -EINVAL;
 247         }
 248
 249         endpoint->service_id = service_connreq->service_id;
 250         endpoint->max_txqdepth = service_connreq->max_send_qdepth;
 251         endpoint->ul_pipeid = service_to_ulpipe(service_connreq->service_id);
 252         endpoint->dl_pipeid = service_to_dlpipe(service_connreq->service_id);
 253         endpoint->ep_callbacks = service_connreq->ep_callbacks;
 254
 255         skb = alloc_skb(sizeof(struct htc_conn_svc_msg) +
 256                             sizeof(struct htc_frame_hdr), GFP_ATOMIC);
 257         if (!skb) {
 258                 dev_err(target->dev, "Failed to allocate buf to send"
 259                         "service connect req\n");
 260                 return -ENOMEM;
 261         }
 262
 263         skb_reserve(skb, sizeof(struct htc_frame_hdr));
 264
 265         conn_msg = skb_put(skb, sizeof(struct htc_conn_svc_msg));
 266         conn_msg->service_id = cpu_to_be16(service_connreq->service_id);
 267         conn_msg->msg_id = cpu_to_be16(HTC_MSG_CONNECT_SERVICE_ID);
 268         conn_msg->con_flags = cpu_to_be16(service_connreq->con_flags);
 269         conn_msg->dl_pipeid = endpoint->dl_pipeid;
 270         conn_msg->ul_pipeid = endpoint->ul_pipeid;
 271
 272         ret = htc_issue_send(target, skb, skb->len, 0, ENDPOINT0);
 273         if (ret)
 274                 goto err;
 275
 276         time_left = wait_for_completion_timeout(&target->cmd_wait, HZ);
 277         if (!time_left) {
 278                 dev_err(target->dev, "Service connection timeout for: %d\n",
 279                         service_connreq->service_id);
 280                 return -ETIMEDOUT;
 281         }
 282
 283         *conn_rsp_epid = target->conn_rsp_epid;
 284         return 0;
 285 err:
 286         kfree_skb(skb);
 287         return ret;
 288 }
 289
 290 int htc_send(struct htc_target *target, struct sk_buff *skb)
 291 {
 292         struct ath9k_htc_tx_ctl *tx_ctl;
 293
 294         tx_ctl = HTC_SKB_CB(skb);
 295         return htc_issue_send(target, skb, skb->len, 0, tx_ctl->epid);
 296 }
 297
 298 int htc_send_epid(struct htc_target *target, struct sk_buff *skb,
 299                   enum htc_endpoint_id epid)
 300 {
 301         return htc_issue_send(target, skb, skb->len, 0, epid);
 302 }
 303
 304 void htc_stop(struct htc_target *target)
 305 {
 306         target->hif->stop(target->hif_dev);
 307 }
 308
 309 void htc_start(struct htc_target *target)
 310 {
 311         target->hif->start(target->hif_dev);
 312 }
 313
 314 void htc_sta_drain(struct htc_target *target, u8 idx)
 315 {
 316         target->hif->sta_drain(target->hif_dev, idx);
 317 }
 318
 319 void ath9k_htc_txcompletion_cb(struct htc_target *htc_handle,
 320                                struct sk_buff *skb, bool txok)
 321 {
 322         struct htc_endpoint *endpoint;
 323         struct htc_frame_hdr *htc_hdr = NULL;
 324
 325         if (htc_handle->htc_flags & HTC_OP_CONFIG_PIPE_CREDITS) {
 326                 complete(&htc_handle->cmd_wait);
 327                 htc_handle->htc_flags &= ~HTC_OP_CONFIG_PIPE_CREDITS;
 328                 goto ret;
 329         }
 330
 331         if (htc_handle->htc_flags & HTC_OP_START_WAIT) {
 332                 complete(&htc_handle->cmd_wait);
 333                 htc_handle->htc_flags &= ~HTC_OP_START_WAIT;
 334                 goto ret;
 335         }
 336
 337         if (skb) {
 338                 htc_hdr = (struct htc_frame_hdr *) skb->data;
 339                 endpoint = &htc_handle->endpoint[htc_hdr->endpoint_id];
 340                 skb_pull(skb, sizeof(struct htc_frame_hdr));
 341
 342                 if (endpoint->ep_callbacks.tx) {
 343                         endpoint->ep_callbacks.tx(endpoint->ep_callbacks.priv,
 344                                                   skb, htc_hdr->endpoint_id,
 345                                                   txok);
 346                 } else {
 347                         kfree_skb(skb);
 348                 }
 349         }
 350
 351         return;
 352 ret:
 353         kfree_skb(skb);
 354 }
 355
 356 static void ath9k_htc_fw_panic_report(struct htc_target *htc_handle,
 357                                       struct sk_buff *skb)
 358 {
 359         uint32_t *pattern = (uint32_t *)skb->data;
 360
 361         switch (*pattern) {
 362         case 0x33221199:
 363                 {
 364                 struct htc_panic_bad_vaddr *htc_panic;
 365                 htc_panic = (struct htc_panic_bad_vaddr *) skb->data;
 366                 dev_err(htc_handle->dev, "ath: firmware panic! "
 367                         "exccause: 0x%08x; pc: 0x%08x; badvaddr: 0x%08x.\n",
 368                         htc_panic->exccause, htc_panic->pc,
 369                         htc_panic->badvaddr);
 370                 break;
 371                 }
 372         case 0x33221299:
 373                 {
 374                 struct htc_panic_bad_epid *htc_panic;
 375                 htc_panic = (struct htc_panic_bad_epid *) skb->data;
 376                 dev_err(htc_handle->dev, "ath: firmware panic! "
 377                         "bad epid: 0x%08x\n", htc_panic->epid);
 378                 break;
 379                 }
 380         default:
 381                 dev_err(htc_handle->dev, "ath: unknown panic pattern!\n");
 382                 break;
 383         }
 384 }
 385
 386 /*
 387  * HTC Messages are handled directly here and the obtained SKB
 388  * is freed.
 389  *
 390  * Service messages (Data, WMI) passed to the corresponding
 391  * endpoint RX handlers, which have to free the SKB.
 392  */
 393 void ath9k_htc_rx_msg(struct htc_target *htc_handle,
 394                       struct sk_buff *skb, u32 len, u8 pipe_id)
 395 {
 396         struct htc_frame_hdr *htc_hdr;
 397         enum htc_endpoint_id epid;
 398         struct htc_endpoint *endpoint;
 399         __be16 *msg_id;
 400
 401         if (!htc_handle || !skb)
 402                 return;
 403
 404         htc_hdr = (struct htc_frame_hdr *) skb->data;
 405         epid = htc_hdr->endpoint_id;
 406
 407         if (epid == 0x99) {
 408                 ath9k_htc_fw_panic_report(htc_handle, skb);
 409                 kfree_skb(skb);
 410                 return;
 411         }
 412
 413         if (epid < 0 || epid >= ENDPOINT_MAX) {
 414                 if (pipe_id != USB_REG_IN_PIPE)
 415                         dev_kfree_skb_any(skb);
 416                 else
 417                         kfree_skb(skb);
 418                 return;
 419         }
 420
 421         if (epid == ENDPOINT0) {
 422
 423                 /* Handle trailer */
 424                 if (htc_hdr->flags & HTC_FLAGS_RECV_TRAILER) {
 425                         if (be32_to_cpu(*(__be32 *) skb->data) == 0x00C60000)
 426                                 /* Move past the Watchdog pattern */
 427                                 htc_hdr = (struct htc_frame_hdr *)(skb->data + 4);
 428                 }
 429
 430                 /* Get the message ID */
 431                 msg_id = (__be16 *) ((void *) htc_hdr +
 432                                      sizeof(struct htc_frame_hdr));
 433
 434                 /* Now process HTC messages */
 435                 switch (be16_to_cpu(*msg_id)) {
 436                 case HTC_MSG_READY_ID:
 437                         htc_process_target_rdy(htc_handle, htc_hdr);
 438                         break;
 439                 case HTC_MSG_CONNECT_SERVICE_RESPONSE_ID:
 440                         htc_process_conn_rsp(htc_handle, htc_hdr);
 441                         break;
 442                 default:
 443                         break;
 444                 }
 445
 446                 kfree_skb(skb);
 447
 448         } else {
 449                 if (htc_hdr->flags & HTC_FLAGS_RECV_TRAILER)
 450                         skb_trim(skb, len - htc_hdr->control[0]);
 451
 452                 skb_pull(skb, sizeof(struct htc_frame_hdr));
 453
 454                 endpoint = &htc_handle->endpoint[epid];
 455                 if (endpoint->ep_callbacks.rx)
 456                         endpoint->ep_callbacks.rx(endpoint->ep_callbacks.priv,
 457                                                   skb, epid);
 458         }
 459 }
 460
 461 struct htc_target *ath9k_htc_hw_alloc(void *hif_handle,
 462                                       struct ath9k_htc_hif *hif,
 463                                       struct device *dev)
 464 {
 465         struct htc_endpoint *endpoint;
 466         struct htc_target *target;
 467
 468         target = kzalloc(sizeof(struct htc_target), GFP_KERNEL);
 469         if (!target)
 470                 return NULL;
 471
 472         init_completion(&target->target_wait);
 473         init_completion(&target->cmd_wait);
 474
 475         target->hif = hif;
 476         target->hif_dev = hif_handle;
 477         target->dev = dev;
 478
 479         /* Assign control endpoint pipe IDs */
 480         endpoint = &target->endpoint[ENDPOINT0];
 481         endpoint->ul_pipeid = hif->control_ul_pipe;
 482         endpoint->dl_pipeid = hif->control_dl_pipe;
 483
 484         atomic_set(&target->tgt_ready, 0);
 485
 486         return target;
 487 }
 488
 489 void ath9k_htc_hw_free(struct htc_target *htc)
 490 {
 491         kfree(htc);
 492 }
 493
 494 int ath9k_htc_hw_init(struct htc_target *target,
 495                       struct device *dev, u16 devid,
 496                       char *product, u32 drv_info)
 497 {
 498         if (ath9k_htc_probe_device(target, dev, devid, product, drv_info)) {
 499                 pr_err("Failed to initialize the device\n");
 500                 return -ENODEV;
 501         }
 502
 503         return 0;
 504 }
 505
 506 void ath9k_htc_hw_deinit(struct htc_target *target, bool hot_unplug)
 507 {
 508         if (target)
 509                 ath9k_htc_disconnect_device(target, hot_unplug);
 510 }