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

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