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 } else { 348 kfree_skb(skb); 349 } 350 } 351 352 return; 353 ret: 354 /* HTC-generated packets are freed here. */ 355 if (htc_hdr && htc_hdr->endpoint_id != ENDPOINT0) 356 dev_kfree_skb_any(skb); 357 else 358 kfree_skb(skb); 359 } 360 361 /* 362 * HTC Messages are handled directly here and the obtained SKB 363 * is freed. 364 * 365 * Service messages (Data, WMI) passed to the corresponding 366 * endpoint RX handlers, which have to free the SKB. 367 */ 368 void ath9k_htc_rx_msg(struct htc_target *htc_handle, 369 struct sk_buff *skb, u32 len, u8 pipe_id) 370 { 371 struct htc_frame_hdr *htc_hdr; 372 enum htc_endpoint_id epid; 373 struct htc_endpoint *endpoint; 374 __be16 *msg_id; 375 376 if (!htc_handle || !skb) 377 return; 378 379 htc_hdr = (struct htc_frame_hdr *) skb->data; 380 epid = htc_hdr->endpoint_id; 381 382 if (epid >= ENDPOINT_MAX) { 383 if (pipe_id != USB_REG_IN_PIPE) 384 dev_kfree_skb_any(skb); 385 else 386 kfree_skb(skb); 387 return; 388 } 389 390 if (epid == ENDPOINT0) { 391 392 /* Handle trailer */ 393 if (htc_hdr->flags & HTC_FLAGS_RECV_TRAILER) { 394 if (be32_to_cpu(*(__be32 *) skb->data) == 0x00C60000) 395 /* Move past the Watchdog pattern */ 396 htc_hdr = (struct htc_frame_hdr *)(skb->data + 4); 397 } 398 399 /* Get the message ID */ 400 msg_id = (__be16 *) ((void *) htc_hdr + 401 sizeof(struct htc_frame_hdr)); 402 403 /* Now process HTC messages */ 404 switch (be16_to_cpu(*msg_id)) { 405 case HTC_MSG_READY_ID: 406 htc_process_target_rdy(htc_handle, htc_hdr); 407 break; 408 case HTC_MSG_CONNECT_SERVICE_RESPONSE_ID: 409 htc_process_conn_rsp(htc_handle, htc_hdr); 410 break; 411 default: 412 break; 413 } 414 415 kfree_skb(skb); 416 417 } else { 418 if (htc_hdr->flags & HTC_FLAGS_RECV_TRAILER) 419 skb_trim(skb, len - htc_hdr->control[0]); 420 421 skb_pull(skb, sizeof(struct htc_frame_hdr)); 422 423 endpoint = &htc_handle->endpoint[epid]; 424 if (endpoint->ep_callbacks.rx) 425 endpoint->ep_callbacks.rx(endpoint->ep_callbacks.priv, 426 skb, epid); 427 } 428 } 429 430 struct htc_target *ath9k_htc_hw_alloc(void *hif_handle, 431 struct ath9k_htc_hif *hif, 432 struct device *dev) 433 { 434 struct htc_endpoint *endpoint; 435 struct htc_target *target; 436 437 target = kzalloc(sizeof(struct htc_target), GFP_KERNEL); 438 if (!target) 439 return NULL; 440 441 init_completion(&target->target_wait); 442 init_completion(&target->cmd_wait); 443 444 target->hif = hif; 445 target->hif_dev = hif_handle; 446 target->dev = dev; 447 448 /* Assign control endpoint pipe IDs */ 449 endpoint = &target->endpoint[ENDPOINT0]; 450 endpoint->ul_pipeid = hif->control_ul_pipe; 451 endpoint->dl_pipeid = hif->control_dl_pipe; 452 453 atomic_set(&target->tgt_ready, 0); 454 455 return target; 456 } 457 458 void ath9k_htc_hw_free(struct htc_target *htc) 459 { 460 kfree(htc); 461 } 462 463 int ath9k_htc_hw_init(struct htc_target *target, 464 struct device *dev, u16 devid, 465 char *product, u32 drv_info) 466 { 467 if (ath9k_htc_probe_device(target, dev, devid, product, drv_info)) { 468 pr_err("Failed to initialize the device\n"); 469 return -ENODEV; 470 } 471 472 return 0; 473 } 474 475 void ath9k_htc_hw_deinit(struct htc_target *target, bool hot_unplug) 476 { 477 if (target) 478 ath9k_htc_disconnect_device(target, hot_unplug); 479 } 480