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1/*2 * Copyright (c) 2010-2011 Atheros Communications Inc.3 *4 * Permission to use, copy, modify, and/or distribute this software for any5 * purpose with or without fee is hereby granted, provided that the above6 * copyright notice and this permission notice appear in all copies.7 *8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.15 */16 17#include "htc.h"18 19static const char *wmi_cmd_to_name(enum wmi_cmd_id wmi_cmd)20{21 switch (wmi_cmd) {22 case WMI_ECHO_CMDID:23 return "WMI_ECHO_CMDID";24 case WMI_ACCESS_MEMORY_CMDID:25 return "WMI_ACCESS_MEMORY_CMDID";26 case WMI_GET_FW_VERSION:27 return "WMI_GET_FW_VERSION";28 case WMI_DISABLE_INTR_CMDID:29 return "WMI_DISABLE_INTR_CMDID";30 case WMI_ENABLE_INTR_CMDID:31 return "WMI_ENABLE_INTR_CMDID";32 case WMI_ATH_INIT_CMDID:33 return "WMI_ATH_INIT_CMDID";34 case WMI_ABORT_TXQ_CMDID:35 return "WMI_ABORT_TXQ_CMDID";36 case WMI_STOP_TX_DMA_CMDID:37 return "WMI_STOP_TX_DMA_CMDID";38 case WMI_ABORT_TX_DMA_CMDID:39 return "WMI_ABORT_TX_DMA_CMDID";40 case WMI_DRAIN_TXQ_CMDID:41 return "WMI_DRAIN_TXQ_CMDID";42 case WMI_DRAIN_TXQ_ALL_CMDID:43 return "WMI_DRAIN_TXQ_ALL_CMDID";44 case WMI_START_RECV_CMDID:45 return "WMI_START_RECV_CMDID";46 case WMI_STOP_RECV_CMDID:47 return "WMI_STOP_RECV_CMDID";48 case WMI_FLUSH_RECV_CMDID:49 return "WMI_FLUSH_RECV_CMDID";50 case WMI_SET_MODE_CMDID:51 return "WMI_SET_MODE_CMDID";52 case WMI_NODE_CREATE_CMDID:53 return "WMI_NODE_CREATE_CMDID";54 case WMI_NODE_REMOVE_CMDID:55 return "WMI_NODE_REMOVE_CMDID";56 case WMI_VAP_REMOVE_CMDID:57 return "WMI_VAP_REMOVE_CMDID";58 case WMI_VAP_CREATE_CMDID:59 return "WMI_VAP_CREATE_CMDID";60 case WMI_REG_READ_CMDID:61 return "WMI_REG_READ_CMDID";62 case WMI_REG_WRITE_CMDID:63 return "WMI_REG_WRITE_CMDID";64 case WMI_REG_RMW_CMDID:65 return "WMI_REG_RMW_CMDID";66 case WMI_RC_STATE_CHANGE_CMDID:67 return "WMI_RC_STATE_CHANGE_CMDID";68 case WMI_RC_RATE_UPDATE_CMDID:69 return "WMI_RC_RATE_UPDATE_CMDID";70 case WMI_TARGET_IC_UPDATE_CMDID:71 return "WMI_TARGET_IC_UPDATE_CMDID";72 case WMI_TX_AGGR_ENABLE_CMDID:73 return "WMI_TX_AGGR_ENABLE_CMDID";74 case WMI_TGT_DETACH_CMDID:75 return "WMI_TGT_DETACH_CMDID";76 case WMI_NODE_UPDATE_CMDID:77 return "WMI_NODE_UPDATE_CMDID";78 case WMI_INT_STATS_CMDID:79 return "WMI_INT_STATS_CMDID";80 case WMI_TX_STATS_CMDID:81 return "WMI_TX_STATS_CMDID";82 case WMI_RX_STATS_CMDID:83 return "WMI_RX_STATS_CMDID";84 case WMI_BITRATE_MASK_CMDID:85 return "WMI_BITRATE_MASK_CMDID";86 }87 88 return "Bogus";89}90 91struct wmi *ath9k_init_wmi(struct ath9k_htc_priv *priv)92{93 struct wmi *wmi;94 95 wmi = kzalloc(sizeof(struct wmi), GFP_KERNEL);96 if (!wmi)97 return NULL;98 99 wmi->drv_priv = priv;100 wmi->stopped = false;101 skb_queue_head_init(&wmi->wmi_event_queue);102 spin_lock_init(&wmi->wmi_lock);103 spin_lock_init(&wmi->event_lock);104 mutex_init(&wmi->op_mutex);105 mutex_init(&wmi->multi_write_mutex);106 mutex_init(&wmi->multi_rmw_mutex);107 init_completion(&wmi->cmd_wait);108 INIT_LIST_HEAD(&wmi->pending_tx_events);109 tasklet_setup(&wmi->wmi_event_tasklet, ath9k_wmi_event_tasklet);110 111 return wmi;112}113 114void ath9k_stop_wmi(struct ath9k_htc_priv *priv)115{116 struct wmi *wmi = priv->wmi;117 118 mutex_lock(&wmi->op_mutex);119 wmi->stopped = true;120 mutex_unlock(&wmi->op_mutex);121}122 123void ath9k_destroy_wmi(struct ath9k_htc_priv *priv)124{125 kfree(priv->wmi);126}127 128void ath9k_wmi_event_drain(struct ath9k_htc_priv *priv)129{130 unsigned long flags;131 132 tasklet_kill(&priv->wmi->wmi_event_tasklet);133 spin_lock_irqsave(&priv->wmi->wmi_lock, flags);134 __skb_queue_purge(&priv->wmi->wmi_event_queue);135 spin_unlock_irqrestore(&priv->wmi->wmi_lock, flags);136}137 138void ath9k_wmi_event_tasklet(struct tasklet_struct *t)139{140 struct wmi *wmi = from_tasklet(wmi, t, wmi_event_tasklet);141 struct ath9k_htc_priv *priv = wmi->drv_priv;142 struct wmi_cmd_hdr *hdr;143 void *wmi_event;144 struct wmi_event_swba *swba;145 struct sk_buff *skb = NULL;146 unsigned long flags;147 u16 cmd_id;148 149 do {150 spin_lock_irqsave(&wmi->wmi_lock, flags);151 skb = __skb_dequeue(&wmi->wmi_event_queue);152 if (!skb) {153 spin_unlock_irqrestore(&wmi->wmi_lock, flags);154 return;155 }156 spin_unlock_irqrestore(&wmi->wmi_lock, flags);157 158 /* Check if ath9k_htc_probe_device() completed. */159 if (!data_race(priv->initialized)) {160 kfree_skb(skb);161 continue;162 }163 164 hdr = (struct wmi_cmd_hdr *) skb->data;165 cmd_id = be16_to_cpu(hdr->command_id);166 wmi_event = skb_pull(skb, sizeof(struct wmi_cmd_hdr));167 168 switch (cmd_id) {169 case WMI_SWBA_EVENTID:170 swba = wmi_event;171 ath9k_htc_swba(priv, swba);172 break;173 case WMI_FATAL_EVENTID:174 ieee80211_queue_work(wmi->drv_priv->hw,175 &wmi->drv_priv->fatal_work);176 break;177 case WMI_TXSTATUS_EVENTID:178 spin_lock_bh(&priv->tx.tx_lock);179 if (priv->tx.flags & ATH9K_HTC_OP_TX_DRAIN) {180 spin_unlock_bh(&priv->tx.tx_lock);181 break;182 }183 spin_unlock_bh(&priv->tx.tx_lock);184 185 ath9k_htc_txstatus(priv, wmi_event);186 break;187 default:188 break;189 }190 191 kfree_skb(skb);192 } while (1);193}194 195void ath9k_fatal_work(struct work_struct *work)196{197 struct ath9k_htc_priv *priv = container_of(work, struct ath9k_htc_priv,198 fatal_work);199 struct ath_common *common = ath9k_hw_common(priv->ah);200 201 ath_dbg(common, FATAL, "FATAL Event received, resetting device\n");202 ath9k_htc_reset(priv);203}204 205static void ath9k_wmi_rsp_callback(struct wmi *wmi, struct sk_buff *skb)206{207 skb_pull(skb, sizeof(struct wmi_cmd_hdr));208 209 if (wmi->cmd_rsp_buf != NULL && wmi->cmd_rsp_len != 0)210 memcpy(wmi->cmd_rsp_buf, skb->data, wmi->cmd_rsp_len);211 212 complete(&wmi->cmd_wait);213}214 215static void ath9k_wmi_ctrl_rx(void *priv, struct sk_buff *skb,216 enum htc_endpoint_id epid)217{218 struct wmi *wmi = priv;219 struct wmi_cmd_hdr *hdr;220 unsigned long flags;221 u16 cmd_id;222 223 if (unlikely(wmi->stopped))224 goto free_skb;225 226 /* Validate the obtained SKB. */227 if (unlikely(skb->len < sizeof(struct wmi_cmd_hdr)))228 goto free_skb;229 230 hdr = (struct wmi_cmd_hdr *) skb->data;231 cmd_id = be16_to_cpu(hdr->command_id);232 233 if (cmd_id & 0x1000) {234 spin_lock_irqsave(&wmi->wmi_lock, flags);235 __skb_queue_tail(&wmi->wmi_event_queue, skb);236 spin_unlock_irqrestore(&wmi->wmi_lock, flags);237 tasklet_schedule(&wmi->wmi_event_tasklet);238 return;239 }240 241 /* Check if there has been a timeout. */242 spin_lock_irqsave(&wmi->wmi_lock, flags);243 if (be16_to_cpu(hdr->seq_no) != wmi->last_seq_id) {244 spin_unlock_irqrestore(&wmi->wmi_lock, flags);245 goto free_skb;246 }247 248 /* WMI command response */249 ath9k_wmi_rsp_callback(wmi, skb);250 spin_unlock_irqrestore(&wmi->wmi_lock, flags);251 252free_skb:253 kfree_skb(skb);254}255 256static void ath9k_wmi_ctrl_tx(void *priv, struct sk_buff *skb,257 enum htc_endpoint_id epid, bool txok)258{259 kfree_skb(skb);260}261 262int ath9k_wmi_connect(struct htc_target *htc, struct wmi *wmi,263 enum htc_endpoint_id *wmi_ctrl_epid)264{265 struct htc_service_connreq connect;266 int ret;267 268 wmi->htc = htc;269 270 memset(&connect, 0, sizeof(connect));271 272 connect.ep_callbacks.priv = wmi;273 connect.ep_callbacks.tx = ath9k_wmi_ctrl_tx;274 connect.ep_callbacks.rx = ath9k_wmi_ctrl_rx;275 connect.service_id = WMI_CONTROL_SVC;276 277 ret = htc_connect_service(htc, &connect, &wmi->ctrl_epid);278 if (ret)279 return ret;280 281 *wmi_ctrl_epid = wmi->ctrl_epid;282 283 return 0;284}285 286static int ath9k_wmi_cmd_issue(struct wmi *wmi,287 struct sk_buff *skb,288 enum wmi_cmd_id cmd, u16 len,289 u8 *rsp_buf, u32 rsp_len)290{291 struct wmi_cmd_hdr *hdr;292 unsigned long flags;293 294 hdr = skb_push(skb, sizeof(struct wmi_cmd_hdr));295 hdr->command_id = cpu_to_be16(cmd);296 hdr->seq_no = cpu_to_be16(++wmi->tx_seq_id);297 298 spin_lock_irqsave(&wmi->wmi_lock, flags);299 300 /* record the rsp buffer and length */301 wmi->cmd_rsp_buf = rsp_buf;302 wmi->cmd_rsp_len = rsp_len;303 304 wmi->last_seq_id = wmi->tx_seq_id;305 spin_unlock_irqrestore(&wmi->wmi_lock, flags);306 307 return htc_send_epid(wmi->htc, skb, wmi->ctrl_epid);308}309 310int ath9k_wmi_cmd(struct wmi *wmi, enum wmi_cmd_id cmd_id,311 u8 *cmd_buf, u32 cmd_len,312 u8 *rsp_buf, u32 rsp_len,313 u32 timeout)314{315 struct ath_hw *ah = wmi->drv_priv->ah;316 struct ath_common *common = ath9k_hw_common(ah);317 u16 headroom = sizeof(struct htc_frame_hdr) +318 sizeof(struct wmi_cmd_hdr);319 unsigned long time_left, flags;320 struct sk_buff *skb;321 int ret = 0;322 323 if (ah->ah_flags & AH_UNPLUGGED)324 return 0;325 326 skb = alloc_skb(headroom + cmd_len, GFP_ATOMIC);327 if (!skb)328 return -ENOMEM;329 330 skb_reserve(skb, headroom);331 332 if (cmd_len != 0 && cmd_buf != NULL) {333 skb_put_data(skb, cmd_buf, cmd_len);334 }335 336 mutex_lock(&wmi->op_mutex);337 338 /* check if wmi stopped flag is set */339 if (unlikely(wmi->stopped)) {340 ret = -EPROTO;341 goto out;342 }343 344 ret = ath9k_wmi_cmd_issue(wmi, skb, cmd_id, cmd_len, rsp_buf, rsp_len);345 if (ret)346 goto out;347 348 time_left = wait_for_completion_timeout(&wmi->cmd_wait, timeout);349 if (!time_left) {350 ath_dbg(common, WMI, "Timeout waiting for WMI command: %s\n",351 wmi_cmd_to_name(cmd_id));352 spin_lock_irqsave(&wmi->wmi_lock, flags);353 wmi->last_seq_id = 0;354 spin_unlock_irqrestore(&wmi->wmi_lock, flags);355 mutex_unlock(&wmi->op_mutex);356 return -ETIMEDOUT;357 }358 359 mutex_unlock(&wmi->op_mutex);360 361 return 0;362 363out:364 ath_dbg(common, WMI, "WMI failure for: %s\n", wmi_cmd_to_name(cmd_id));365 mutex_unlock(&wmi->op_mutex);366 kfree_skb(skb);367 368 return ret;369}370