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, 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 = (struct htc_config_pipe_msg *)
 159                 skb_put(skb, sizeof(struct htc_config_pipe_msg));
 160
 161         cp_msg->message_id = cpu_to_be16(HTC_MSG_CONFIG_PIPE_ID);
 162         cp_msg->pipe_id = USB_WLAN_TX_PIPE;
 163         cp_msg->credits = target->credits;
 164
 165         target->htc_flags |= HTC_OP_CONFIG_PIPE_CREDITS;
 166
 167         ret = htc_issue_send(target, skb, skb->len, 0, ENDPOINT0);
 168         if (ret)
 169                 goto err;
 170
 171         time_left = wait_for_completion_timeout(&target->cmd_wait, HZ);
 172         if (!time_left) {
 173                 dev_err(target->dev, "HTC credit config timeout\n");
 174                 return -ETIMEDOUT;
 175         }
 176
 177         return 0;
 178 err:
 179         kfree_skb(skb);
 180         return -EINVAL;
 181 }
 182
 183 static int htc_setup_complete(struct htc_target *target)
 184 {
 185         struct sk_buff *skb;
 186         struct htc_comp_msg *comp_msg;
 187         int ret = 0, 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 = (struct htc_comp_msg *)
 197                 skb_put(skb, sizeof(struct htc_comp_msg));
 198         comp_msg->msg_id = cpu_to_be16(HTC_MSG_SETUP_COMPLETE_ID);
 199
 200         target->htc_flags |= HTC_OP_START_WAIT;
 201
 202         ret = htc_issue_send(target, skb, skb->len, 0, ENDPOINT0);
 203         if (ret)
 204                 goto err;
 205
 206         time_left = wait_for_completion_timeout(&target->cmd_wait, HZ);
 207         if (!time_left) {
 208                 dev_err(target->dev, "HTC start timeout\n");
 209                 return -ETIMEDOUT;
 210         }
 211
 212         return 0;
 213
 214 err:
 215         kfree_skb(skb);
 216         return -EINVAL;
 217 }
 218
 219 /* HTC APIs */
 220
 221 int htc_init(struct htc_target *target)
 222 {
 223         int ret;
 224
 225         ret = htc_config_pipe_credits(target);
 226         if (ret)
 227                 return ret;
 228
 229         return htc_setup_complete(target);
 230 }
 231
 232 int htc_connect_service(struct htc_target *target,
 233                      struct htc_service_connreq *service_connreq,
 234                      enum htc_endpoint_id *conn_rsp_epid)
 235 {
 236         struct sk_buff *skb;
 237         struct htc_endpoint *endpoint;
 238         struct htc_conn_svc_msg *conn_msg;
 239         int ret, 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"
 245                         "service %d\n", 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 = (struct htc_conn_svc_msg *)
 266                         skb_put(skb, sizeof(struct htc_conn_svc_msg));
 267         conn_msg->service_id = cpu_to_be16(service_connreq->service_id);
 268         conn_msg->msg_id = cpu_to_be16(HTC_MSG_CONNECT_SERVICE_ID);
 269         conn_msg->con_flags = cpu_to_be16(service_connreq->con_flags);
 270         conn_msg->dl_pipeid = endpoint->dl_pipeid;
 271         conn_msg->ul_pipeid = endpoint->ul_pipeid;
 272
 273         ret = htc_issue_send(target, skb, skb->len, 0, ENDPOINT0);
 274         if (ret)
 275                 goto err;
 276
 277         time_left = wait_for_completion_timeout(&target->cmd_wait, HZ);
 278         if (!time_left) {
 279                 dev_err(target->dev, "Service connection timeout for: %d\n",
 280                         service_connreq->service_id);
 281                 return -ETIMEDOUT;
 282         }
 283
 284         *conn_rsp_epid = target->conn_rsp_epid;
 285         return 0;
 286 err:
 287         kfree_skb(skb);
 288         return ret;
 289 }
 290
 291 int htc_send(struct htc_target *target, struct sk_buff *skb)
 292 {
 293         struct ath9k_htc_tx_ctl *tx_ctl;
 294
 295         tx_ctl = HTC_SKB_CB(skb);
 296         return htc_issue_send(target, skb, skb->len, 0, tx_ctl->epid);
 297 }
 298
 299 int htc_send_epid(struct htc_target *target, struct sk_buff *skb,
 300                   enum htc_endpoint_id epid)
 301 {
 302         return htc_issue_send(target, skb, skb->len, 0, epid);
 303 }
 304
 305 void htc_stop(struct htc_target *target)
 306 {
 307         target->hif->stop(target->hif_dev);
 308 }
 309
 310 void htc_start(struct htc_target *target)
 311 {
 312         target->hif->start(target->hif_dev);
 313 }
 314
 315 void htc_sta_drain(struct htc_target *target, u8 idx)
 316 {
 317         target->hif->sta_drain(target->hif_dev, idx);
 318 }
 319
 320 void ath9k_htc_txcompletion_cb(struct htc_target *htc_handle,
 321                                struct sk_buff *skb, bool txok)
 322 {
 323         struct htc_endpoint *endpoint;
 324         struct htc_frame_hdr *htc_hdr = NULL;
 325
 326         if (htc_handle->htc_flags & HTC_OP_CONFIG_PIPE_CREDITS) {
 327                 complete(&htc_handle->cmd_wait);
 328                 htc_handle->htc_flags &= ~HTC_OP_CONFIG_PIPE_CREDITS;
 329                 goto ret;
 330         }
 331
 332         if (htc_handle->htc_flags & HTC_OP_START_WAIT) {
 333                 complete(&htc_handle->cmd_wait);
 334                 htc_handle->htc_flags &= ~HTC_OP_START_WAIT;
 335                 goto ret;
 336         }
 337
 338         if (skb) {
 339                 htc_hdr = (struct htc_frame_hdr *) skb->data;
 340                 endpoint = &htc_handle->endpoint[htc_hdr->endpoint_id];
 341                 skb_pull(skb, sizeof(struct htc_frame_hdr));
 342
 343                 if (endpoint->ep_callbacks.tx) {
 344                         endpoint->ep_callbacks.tx(endpoint->ep_callbacks.priv,
 345                                                   skb, htc_hdr->endpoint_id,
 346                                                   txok);
 347                 }
 348         }
 349
 350         return;
 351 ret:
 352         /* HTC-generated packets are freed here. */
 353         if (htc_hdr && htc_hdr->endpoint_id != ENDPOINT0)
 354                 dev_kfree_skb_any(skb);
 355         else
 356                 kfree_skb(skb);
 357 }
 358
 359 /*
 360  * HTC Messages are handled directly here and the obtained SKB
 361  * is freed.
 362  *
 363  * Service messages (Data, WMI) passed to the corresponding
 364  * endpoint RX handlers, which have to free the SKB.
 365  */
 366 void ath9k_htc_rx_msg(struct htc_target *htc_handle,
 367                       struct sk_buff *skb, u32 len, u8 pipe_id)
 368 {
 369         struct htc_frame_hdr *htc_hdr;
 370         enum htc_endpoint_id epid;
 371         struct htc_endpoint *endpoint;
 372         __be16 *msg_id;
 373
 374         if (!htc_handle || !skb)
 375                 return;
 376
 377         htc_hdr = (struct htc_frame_hdr *) skb->data;
 378         epid = htc_hdr->endpoint_id;
 379
 380         if (epid >= ENDPOINT_MAX) {
 381                 if (pipe_id != USB_REG_IN_PIPE)
 382                         dev_kfree_skb_any(skb);
 383                 else
 384                         kfree_skb(skb);
 385                 return;
 386         }
 387
 388         if (epid == ENDPOINT0) {
 389
 390                 /* Handle trailer */
 391                 if (htc_hdr->flags & HTC_FLAGS_RECV_TRAILER) {
 392                         if (be32_to_cpu(*(__be32 *) skb->data) == 0x00C60000)
 393                                 /* Move past the Watchdog pattern */
 394                                 htc_hdr = (struct htc_frame_hdr *)(skb->data + 4);
 395                 }
 396
 397                 /* Get the message ID */
 398                 msg_id = (__be16 *) ((void *) htc_hdr +
 399                                      sizeof(struct htc_frame_hdr));
 400
 401                 /* Now process HTC messages */
 402                 switch (be16_to_cpu(*msg_id)) {
 403                 case HTC_MSG_READY_ID:
 404                         htc_process_target_rdy(htc_handle, htc_hdr);
 405                         break;
 406                 case HTC_MSG_CONNECT_SERVICE_RESPONSE_ID:
 407                         htc_process_conn_rsp(htc_handle, htc_hdr);
 408                         break;
 409                 default:
 410                         break;
 411                 }
 412
 413                 kfree_skb(skb);
 414
 415         } else {
 416                 if (htc_hdr->flags & HTC_FLAGS_RECV_TRAILER)
 417                         skb_trim(skb, len - htc_hdr->control[0]);
 418
 419                 skb_pull(skb, sizeof(struct htc_frame_hdr));
 420
 421                 endpoint = &htc_handle->endpoint[epid];
 422                 if (endpoint->ep_callbacks.rx)
 423                         endpoint->ep_callbacks.rx(endpoint->ep_callbacks.priv,
 424                                                   skb, epid);
 425         }
 426 }
 427
 428 struct htc_target *ath9k_htc_hw_alloc(void *hif_handle,
 429                                       struct ath9k_htc_hif *hif,
 430                                       struct device *dev)
 431 {
 432         struct htc_endpoint *endpoint;
 433         struct htc_target *target;
 434
 435         target = kzalloc(sizeof(struct htc_target), GFP_KERNEL);
 436         if (!target)
 437                 return NULL;
 438
 439         init_completion(&target->target_wait);
 440         init_completion(&target->cmd_wait);
 441
 442         target->hif = hif;
 443         target->hif_dev = hif_handle;
 444         target->dev = dev;
 445
 446         /* Assign control endpoint pipe IDs */
 447         endpoint = &target->endpoint[ENDPOINT0];
 448         endpoint->ul_pipeid = hif->control_ul_pipe;
 449         endpoint->dl_pipeid = hif->control_dl_pipe;
 450
 451         atomic_set(&target->tgt_ready, 0);
 452
 453         return target;
 454 }
 455
 456 void ath9k_htc_hw_free(struct htc_target *htc)
 457 {
 458         kfree(htc);
 459 }
 460
 461 int ath9k_htc_hw_init(struct htc_target *target,
 462                       struct device *dev, u16 devid,
 463                       char *product, u32 drv_info)
 464 {
 465         if (ath9k_htc_probe_device(target, dev, devid, product, drv_info)) {
 466                 pr_err("Failed to initialize the device\n");
 467                 return -ENODEV;
 468         }
 469
 470         return 0;
 471 }
 472
 473 void ath9k_htc_hw_deinit(struct htc_target *target, bool hot_unplug)
 474 {
 475         if (target)
 476                 ath9k_htc_disconnect_device(target, hot_unplug);
 477 }