kernel/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 = (struct htc_frame_hdr *)
  30                 skb_push(skb, sizeof(struct htc_frame_hdr));
  31         hdr->endpoint_id = epid;
  32         hdr->flags = flags;
  33         hdr->payload_len = cpu_to_be16(len);
  34
  35         status = target->hif->send(target->hif_dev, endpoint->ul_pipeid, skb);
  36
  37         return status;
  38 }
  39
  40 static struct htc_endpoint *get_next_avail_ep(struct htc_endpoint *endpoint)
  41 {
  42         enum htc_endpoint_id avail_epid;
  43
  44         for (avail_epid = (ENDPOINT_MAX - 1); avail_epid > ENDPOINT0; avail_epid--)
  45                 if (endpoint[avail_epid].service_id == 0)
  46                         return &endpoint[avail_epid];
  47         return NULL;
  48 }
  49
  50 static u8 service_to_ulpipe(u16 service_id)
  51 {
  52         switch (service_id) {
  53         case WMI_CONTROL_SVC:
  54                 return 4;
  55         case WMI_BEACON_SVC:
  56         case WMI_CAB_SVC:
  57         case WMI_UAPSD_SVC:
  58         case WMI_MGMT_SVC:
  59         case WMI_DATA_VO_SVC:
  60         case WMI_DATA_VI_SVC:
  61         case WMI_DATA_BE_SVC:
  62         case WMI_DATA_BK_SVC:
  63                 return 1;
  64         default:
  65                 return 0;
  66         }
  67 }
  68
  69 static u8 service_to_dlpipe(u16 service_id)
  70 {
  71         switch (service_id) {
  72         case WMI_CONTROL_SVC:
  73                 return 3;
  74         case WMI_BEACON_SVC:
  75         case WMI_CAB_SVC:
  76         case WMI_UAPSD_SVC:
  77         case WMI_MGMT_SVC:
  78         case WMI_DATA_VO_SVC:
  79         case WMI_DATA_VI_SVC:
  80         case WMI_DATA_BE_SVC:
  81         case WMI_DATA_BK_SVC:
  82                 return 2;
  83         default:
  84                 return 0;
  85         }
  86 }
  87
  88 static void htc_process_target_rdy(struct htc_target *target,
  89                                    void *buf)
  90 {
  91         struct htc_endpoint *endpoint;
  92         struct htc_ready_msg *htc_ready_msg = (struct htc_ready_msg *) buf;
  93
  94         target->credit_size = be16_to_cpu(htc_ready_msg->credit_size);
  95
  96         endpoint = &target->endpoint[ENDPOINT0];
  97         endpoint->service_id = HTC_CTRL_RSVD_SVC;
  98         endpoint->max_msglen = HTC_MAX_CONTROL_MESSAGE_LENGTH;
  99         atomic_inc(&target->tgt_ready);
 100         complete(&target->target_wait);
 101 }
 102
 103 static void htc_process_conn_rsp(struct htc_target *target,
 104                                  struct htc_frame_hdr *htc_hdr)
 105 {
 106         struct htc_conn_svc_rspmsg *svc_rspmsg;
 107         struct htc_endpoint *endpoint, *tmp_endpoint = NULL;
 108         u16 service_id;
 109         u16 max_msglen;
 110         enum htc_endpoint_id epid, tepid;
 111
 112         svc_rspmsg = (struct htc_conn_svc_rspmsg *)
 113                 ((void *) htc_hdr + sizeof(struct htc_frame_hdr));
 114
 115         if (svc_rspmsg->status == HTC_SERVICE_SUCCESS) {
 116                 epid = svc_rspmsg->endpoint_id;
 117                 service_id = be16_to_cpu(svc_rspmsg->service_id);
 118                 max_msglen = be16_to_cpu(svc_rspmsg->max_msg_len);
 119                 endpoint = &target->endpoint[epid];
 120
 121                 for (tepid = (ENDPOINT_MAX - 1); tepid > ENDPOINT0; tepid--) {
 122                         tmp_endpoint = &target->endpoint[tepid];
 123                         if (tmp_endpoint->service_id == service_id) {
 124                                 tmp_endpoint->service_id = 0;
 125                                 break;
 126                         }
 127                 }
 128
 129                 if (tepid == ENDPOINT0)
 130                         return;
 131
 132                 endpoint->service_id = service_id;
 133                 endpoint->max_txqdepth = tmp_endpoint->max_txqdepth;
 134                 endpoint->ep_callbacks = tmp_endpoint->ep_callbacks;
 135                 endpoint->ul_pipeid = tmp_endpoint->ul_pipeid;
 136                 endpoint->dl_pipeid = tmp_endpoint->dl_pipeid;
 137                 endpoint->max_msglen = max_msglen;
 138                 target->conn_rsp_epid = epid;
 139                 complete(&target->cmd_wait);
 140         } else {
 141                 target->conn_rsp_epid = ENDPOINT_UNUSED;
 142         }
 143 }
 144
 145 static int htc_config_pipe_credits(struct htc_target *target)
 146 {
 147         struct sk_buff *skb;
 148         struct htc_config_pipe_msg *cp_msg;
 149         int ret;
 150         unsigned long time_left;
 151
 152         skb = alloc_skb(50 + sizeof(struct htc_frame_hdr), GFP_ATOMIC);
 153         if (!skb) {
 154                 dev_err(target->dev, "failed to allocate send buffer\n");
 155                 return -ENOMEM;
 156         }
 157         skb_reserve(skb, sizeof(struct htc_frame_hdr));
 158
 159         cp_msg = (struct htc_config_pipe_msg *)
 160                 skb_put(skb, sizeof(struct htc_config_pipe_msg));
 161
 162         cp_msg->message_id = cpu_to_be16(HTC_MSG_CONFIG_PIPE_ID);
 163         cp_msg->pipe_id = USB_WLAN_TX_PIPE;
 164         cp_msg->credits = target->credits;
 165
 166         target->htc_flags |= HTC_OP_CONFIG_PIPE_CREDITS;
 167
 168         ret = htc_issue_send(target, skb, skb->len, 0, ENDPOINT0);
 169         if (ret)
 170                 goto err;
 171
 172         time_left = wait_for_completion_timeout(&target->cmd_wait, HZ);
 173         if (!time_left) {
 174                 dev_err(target->dev, "HTC credit config timeout\n");
 175                 return -ETIMEDOUT;
 176         }
 177
 178         return 0;
 179 err:
 180         kfree_skb(skb);
 181         return -EINVAL;
 182 }
 183
 184 static int htc_setup_complete(struct htc_target *target)
 185 {
 186         struct sk_buff *skb;
 187         struct htc_comp_msg *comp_msg;
 188         int ret = 0;
 189         unsigned long time_left;
 190
 191         skb = alloc_skb(50 + sizeof(struct htc_frame_hdr), GFP_ATOMIC);
 192         if (!skb) {
 193                 dev_err(target->dev, "failed to allocate send buffer\n");
 194                 return -ENOMEM;
 195         }
 196         skb_reserve(skb, sizeof(struct htc_frame_hdr));
 197
 198         comp_msg = (struct htc_comp_msg *)
 199                 skb_put(skb, sizeof(struct htc_comp_msg));
 200         comp_msg->msg_id = cpu_to_be16(HTC_MSG_SETUP_COMPLETE_ID);
 201
 202         target->htc_flags |= HTC_OP_START_WAIT;
 203
 204         ret = htc_issue_send(target, skb, skb->len, 0, ENDPOINT0);
 205         if (ret)
 206                 goto err;
 207
 208         time_left = wait_for_completion_timeout(&target->cmd_wait, HZ);
 209         if (!time_left) {
 210                 dev_err(target->dev, "HTC start timeout\n");
 211                 return -ETIMEDOUT;
 212         }
 213
 214         return 0;
 215
 216 err:
 217         kfree_skb(skb);
 218         return -EINVAL;
 219 }
 220
 221 /* HTC APIs */
 222
 223 int htc_init(struct htc_target *target)
 224 {
 225         int ret;
 226
 227         ret = htc_config_pipe_credits(target);
 228         if (ret)
 229                 return ret;
 230
 231         return htc_setup_complete(target);
 232 }
 233
 234 int htc_connect_service(struct htc_target *target,
 235                      struct htc_service_connreq *service_connreq,
 236                      enum htc_endpoint_id *conn_rsp_epid)
 237 {
 238         struct sk_buff *skb;
 239         struct htc_endpoint *endpoint;
 240         struct htc_conn_svc_msg *conn_msg;
 241         int ret;
 242         unsigned long time_left;
 243
 244         /* Find an available endpoint */
 245         endpoint = get_next_avail_ep(target->endpoint);
 246         if (!endpoint) {
 247                 dev_err(target->dev, "Endpoint is not available for"
 248                         "service %d\n", service_connreq->service_id);
 249                 return -EINVAL;
 250         }
 251
 252         endpoint->service_id = service_connreq->service_id;
 253         endpoint->max_txqdepth = service_connreq->max_send_qdepth;
 254         endpoint->ul_pipeid = service_to_ulpipe(service_connreq->service_id);
 255         endpoint->dl_pipeid = service_to_dlpipe(service_connreq->service_id);
 256         endpoint->ep_callbacks = service_connreq->ep_callbacks;
 257
 258         skb = alloc_skb(sizeof(struct htc_conn_svc_msg) +
 259                             sizeof(struct htc_frame_hdr), GFP_ATOMIC);
 260         if (!skb) {
 261                 dev_err(target->dev, "Failed to allocate buf to send"
 262                         "service connect req\n");
 263                 return -ENOMEM;
 264         }
 265
 266         skb_reserve(skb, sizeof(struct htc_frame_hdr));
 267
 268         conn_msg = (struct htc_conn_svc_msg *)
 269                         skb_put(skb, sizeof(struct htc_conn_svc_msg));
 270         conn_msg->service_id = cpu_to_be16(service_connreq->service_id);
 271         conn_msg->msg_id = cpu_to_be16(HTC_MSG_CONNECT_SERVICE_ID);
 272         conn_msg->con_flags = cpu_to_be16(service_connreq->con_flags);
 273         conn_msg->dl_pipeid = endpoint->dl_pipeid;
 274         conn_msg->ul_pipeid = endpoint->ul_pipeid;
 275
 276         ret = htc_issue_send(target, skb, skb->len, 0, ENDPOINT0);
 277         if (ret)
 278                 goto err;
 279
 280         time_left = wait_for_completion_timeout(&target->cmd_wait, HZ);
 281         if (!time_left) {
 282                 dev_err(target->dev, "Service connection timeout for: %d\n",
 283                         service_connreq->service_id);
 284                 return -ETIMEDOUT;
 285         }
 286
 287         *conn_rsp_epid = target->conn_rsp_epid;
 288         return 0;
 289 err:
 290         kfree_skb(skb);
 291         return ret;
 292 }
 293
 294 int htc_send(struct htc_target *target, struct sk_buff *skb)
 295 {
 296         struct ath9k_htc_tx_ctl *tx_ctl;
 297
 298         tx_ctl = HTC_SKB_CB(skb);
 299         return htc_issue_send(target, skb, skb->len, 0, tx_ctl->epid);
 300 }
 301
 302 int htc_send_epid(struct htc_target *target, struct sk_buff *skb,
 303                   enum htc_endpoint_id epid)
 304 {
 305         return htc_issue_send(target, skb, skb->len, 0, epid);
 306 }
 307
 308 void htc_stop(struct htc_target *target)
 309 {
 310         target->hif->stop(target->hif_dev);
 311 }
 312
 313 void htc_start(struct htc_target *target)
 314 {
 315         target->hif->start(target->hif_dev);
 316 }
 317
 318 void htc_sta_drain(struct htc_target *target, u8 idx)
 319 {
 320         target->hif->sta_drain(target->hif_dev, idx);
 321 }
 322
 323 void ath9k_htc_txcompletion_cb(struct htc_target *htc_handle,
 324                                struct sk_buff *skb, bool txok)
 325 {
 326         struct htc_endpoint *endpoint;
 327         struct htc_frame_hdr *htc_hdr = NULL;
 328
 329         if (htc_handle->htc_flags & HTC_OP_CONFIG_PIPE_CREDITS) {
 330                 complete(&htc_handle->cmd_wait);
 331                 htc_handle->htc_flags &= ~HTC_OP_CONFIG_PIPE_CREDITS;
 332                 goto ret;
 333         }
 334
 335         if (htc_handle->htc_flags & HTC_OP_START_WAIT) {
 336                 complete(&htc_handle->cmd_wait);
 337                 htc_handle->htc_flags &= ~HTC_OP_START_WAIT;
 338                 goto ret;
 339         }
 340
 341         if (skb) {
 342                 htc_hdr = (struct htc_frame_hdr *) skb->data;
 343                 endpoint = &htc_handle->endpoint[htc_hdr->endpoint_id];
 344                 skb_pull(skb, sizeof(struct htc_frame_hdr));
 345
 346                 if (endpoint->ep_callbacks.tx) {
 347                         endpoint->ep_callbacks.tx(endpoint->ep_callbacks.priv,
 348                                                   skb, htc_hdr->endpoint_id,
 349                                                   txok);
 350                 } else {
 351                         kfree_skb(skb);
 352                 }
 353         }
 354
 355         return;
 356 ret:
 357         kfree_skb(skb);
 358 }
 359
 360 static void ath9k_htc_fw_panic_report(struct htc_target *htc_handle,
 361                                       struct sk_buff *skb)
 362 {
 363         uint32_t *pattern = (uint32_t *)skb->data;
 364
 365         switch (*pattern) {
 366         case 0x33221199:
 367                 {
 368                 struct htc_panic_bad_vaddr *htc_panic;
 369                 htc_panic = (struct htc_panic_bad_vaddr *) skb->data;
 370                 dev_err(htc_handle->dev, "ath: firmware panic! "
 371                         "exccause: 0x%08x; pc: 0x%08x; badvaddr: 0x%08x.\n",
 372                         htc_panic->exccause, htc_panic->pc,
 373                         htc_panic->badvaddr);
 374                 break;
 375                 }
 376         case 0x33221299:
 377                 {
 378                 struct htc_panic_bad_epid *htc_panic;
 379                 htc_panic = (struct htc_panic_bad_epid *) skb->data;
 380                 dev_err(htc_handle->dev, "ath: firmware panic! "
 381                         "bad epid: 0x%08x\n", htc_panic->epid);
 382                 break;
 383                 }
 384         default:
 385                 dev_err(htc_handle->dev, "ath: uknown panic pattern!\n");
 386                 break;
 387         }
 388 }
 389
 390 /*
 391  * HTC Messages are handled directly here and the obtained SKB
 392  * is freed.
 393  *
 394  * Service messages (Data, WMI) passed to the corresponding
 395  * endpoint RX handlers, which have to free the SKB.
 396  */
 397 void ath9k_htc_rx_msg(struct htc_target *htc_handle,
 398                       struct sk_buff *skb, u32 len, u8 pipe_id)
 399 {
 400         struct htc_frame_hdr *htc_hdr;
 401         enum htc_endpoint_id epid;
 402         struct htc_endpoint *endpoint;
 403         __be16 *msg_id;
 404
 405         if (!htc_handle || !skb)
 406                 return;
 407
 408         htc_hdr = (struct htc_frame_hdr *) skb->data;
 409         epid = htc_hdr->endpoint_id;
 410
 411         if (epid == 0x99) {
 412                 ath9k_htc_fw_panic_report(htc_handle, skb);
 413                 kfree_skb(skb);
 414                 return;
 415         }
 416
 417         if (epid >= ENDPOINT_MAX) {
 418                 if (pipe_id != USB_REG_IN_PIPE)
 419                         dev_kfree_skb_any(skb);
 420                 else
 421                         kfree_skb(skb);
 422                 return;
 423         }
 424
 425         if (epid == ENDPOINT0) {
 426
 427                 /* Handle trailer */
 428                 if (htc_hdr->flags & HTC_FLAGS_RECV_TRAILER) {
 429                         if (be32_to_cpu(*(__be32 *) skb->data) == 0x00C60000)
 430                                 /* Move past the Watchdog pattern */
 431                                 htc_hdr = (struct htc_frame_hdr *)(skb->data + 4);
 432                 }
 433
 434                 /* Get the message ID */
 435                 msg_id = (__be16 *) ((void *) htc_hdr +
 436                                      sizeof(struct htc_frame_hdr));
 437
 438                 /* Now process HTC messages */
 439                 switch (be16_to_cpu(*msg_id)) {
 440                 case HTC_MSG_READY_ID:
 441                         htc_process_target_rdy(htc_handle, htc_hdr);
 442                         break;
 443                 case HTC_MSG_CONNECT_SERVICE_RESPONSE_ID:
 444                         htc_process_conn_rsp(htc_handle, htc_hdr);
 445                         break;
 446                 default:
 447                         break;
 448                 }
 449
 450                 kfree_skb(skb);
 451
 452         } else {
 453                 if (htc_hdr->flags & HTC_FLAGS_RECV_TRAILER)
 454                         skb_trim(skb, len - htc_hdr->control[0]);
 455
 456                 skb_pull(skb, sizeof(struct htc_frame_hdr));
 457
 458                 endpoint = &htc_handle->endpoint[epid];
 459                 if (endpoint->ep_callbacks.rx)
 460                         endpoint->ep_callbacks.rx(endpoint->ep_callbacks.priv,
 461                                                   skb, epid);
 462         }
 463 }
 464
 465 struct htc_target *ath9k_htc_hw_alloc(void *hif_handle,
 466                                       struct ath9k_htc_hif *hif,
 467                                       struct device *dev)
 468 {
 469         struct htc_endpoint *endpoint;
 470         struct htc_target *target;
 471
 472         target = kzalloc(sizeof(struct htc_target), GFP_KERNEL);
 473         if (!target)
 474                 return NULL;
 475
 476         init_completion(&target->target_wait);
 477         init_completion(&target->cmd_wait);
 478
 479         target->hif = hif;
 480         target->hif_dev = hif_handle;
 481         target->dev = dev;
 482
 483         /* Assign control endpoint pipe IDs */
 484         endpoint = &target->endpoint[ENDPOINT0];
 485         endpoint->ul_pipeid = hif->control_ul_pipe;
 486         endpoint->dl_pipeid = hif->control_dl_pipe;
 487
 488         atomic_set(&target->tgt_ready, 0);
 489
 490         return target;
 491 }
 492
 493 void ath9k_htc_hw_free(struct htc_target *htc)
 494 {
 495         kfree(htc);
 496 }
 497
 498 int ath9k_htc_hw_init(struct htc_target *target,
 499                       struct device *dev, u16 devid,
 500                       char *product, u32 drv_info)
 501 {
 502         if (ath9k_htc_probe_device(target, dev, devid, product, drv_info)) {
 503                 pr_err("Failed to initialize the device\n");
 504                 return -ENODEV;
 505         }
 506
 507         return 0;
 508 }
 509
 510 void ath9k_htc_hw_deinit(struct htc_target *target, bool hot_unplug)
 511 {
 512         if (target)
 513                 ath9k_htc_disconnect_device(target, hot_unplug);
 514 }