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 #include "htc.h" 18 19 static 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_RC_STATE_CHANGE_CMDID: 65 return "WMI_RC_STATE_CHANGE_CMDID"; 66 case WMI_RC_RATE_UPDATE_CMDID: 67 return "WMI_RC_RATE_UPDATE_CMDID"; 68 case WMI_TARGET_IC_UPDATE_CMDID: 69 return "WMI_TARGET_IC_UPDATE_CMDID"; 70 case WMI_TX_AGGR_ENABLE_CMDID: 71 return "WMI_TX_AGGR_ENABLE_CMDID"; 72 case WMI_TGT_DETACH_CMDID: 73 return "WMI_TGT_DETACH_CMDID"; 74 case WMI_NODE_UPDATE_CMDID: 75 return "WMI_NODE_UPDATE_CMDID"; 76 case WMI_INT_STATS_CMDID: 77 return "WMI_INT_STATS_CMDID"; 78 case WMI_TX_STATS_CMDID: 79 return "WMI_TX_STATS_CMDID"; 80 case WMI_RX_STATS_CMDID: 81 return "WMI_RX_STATS_CMDID"; 82 case WMI_BITRATE_MASK_CMDID: 83 return "WMI_BITRATE_MASK_CMDID"; 84 } 85 86 return "Bogus"; 87 } 88 89 struct wmi *ath9k_init_wmi(struct ath9k_htc_priv *priv) 90 { 91 struct wmi *wmi; 92 93 wmi = kzalloc(sizeof(struct wmi), GFP_KERNEL); 94 if (!wmi) 95 return NULL; 96 97 wmi->drv_priv = priv; 98 wmi->stopped = false; 99 skb_queue_head_init(&wmi->wmi_event_queue); 100 spin_lock_init(&wmi->wmi_lock); 101 spin_lock_init(&wmi->event_lock); 102 mutex_init(&wmi->op_mutex); 103 mutex_init(&wmi->multi_write_mutex); 104 init_completion(&wmi->cmd_wait); 105 INIT_LIST_HEAD(&wmi->pending_tx_events); 106 tasklet_init(&wmi->wmi_event_tasklet, ath9k_wmi_event_tasklet, 107 (unsigned long)wmi); 108 109 return wmi; 110 } 111 112 void ath9k_deinit_wmi(struct ath9k_htc_priv *priv) 113 { 114 struct wmi *wmi = priv->wmi; 115 116 mutex_lock(&wmi->op_mutex); 117 wmi->stopped = true; 118 mutex_unlock(&wmi->op_mutex); 119 120 kfree(priv->wmi); 121 } 122 123 void ath9k_wmi_event_drain(struct ath9k_htc_priv *priv) 124 { 125 unsigned long flags; 126 127 tasklet_kill(&priv->wmi->wmi_event_tasklet); 128 spin_lock_irqsave(&priv->wmi->wmi_lock, flags); 129 __skb_queue_purge(&priv->wmi->wmi_event_queue); 130 spin_unlock_irqrestore(&priv->wmi->wmi_lock, flags); 131 } 132 133 void ath9k_wmi_event_tasklet(unsigned long data) 134 { 135 struct wmi *wmi = (struct wmi *)data; 136 struct ath9k_htc_priv *priv = wmi->drv_priv; 137 struct wmi_cmd_hdr *hdr; 138 void *wmi_event; 139 struct wmi_event_swba *swba; 140 struct sk_buff *skb = NULL; 141 unsigned long flags; 142 u16 cmd_id; 143 144 do { 145 spin_lock_irqsave(&wmi->wmi_lock, flags); 146 skb = __skb_dequeue(&wmi->wmi_event_queue); 147 if (!skb) { 148 spin_unlock_irqrestore(&wmi->wmi_lock, flags); 149 return; 150 } 151 spin_unlock_irqrestore(&wmi->wmi_lock, flags); 152 153 hdr = (struct wmi_cmd_hdr *) skb->data; 154 cmd_id = be16_to_cpu(hdr->command_id); 155 wmi_event = skb_pull(skb, sizeof(struct wmi_cmd_hdr)); 156 157 switch (cmd_id) { 158 case WMI_SWBA_EVENTID: 159 swba = (struct wmi_event_swba *) wmi_event; 160 ath9k_htc_swba(priv, swba); 161 break; 162 case WMI_FATAL_EVENTID: 163 ieee80211_queue_work(wmi->drv_priv->hw, 164 &wmi->drv_priv->fatal_work); 165 break; 166 case WMI_TXSTATUS_EVENTID: 167 spin_lock_bh(&priv->tx.tx_lock); 168 if (priv->tx.flags & ATH9K_HTC_OP_TX_DRAIN) { 169 spin_unlock_bh(&priv->tx.tx_lock); 170 break; 171 } 172 spin_unlock_bh(&priv->tx.tx_lock); 173 174 ath9k_htc_txstatus(priv, wmi_event); 175 break; 176 default: 177 break; 178 } 179 180 kfree_skb(skb); 181 } while (1); 182 } 183 184 void ath9k_fatal_work(struct work_struct *work) 185 { 186 struct ath9k_htc_priv *priv = container_of(work, struct ath9k_htc_priv, 187 fatal_work); 188 struct ath_common *common = ath9k_hw_common(priv->ah); 189 190 ath_dbg(common, FATAL, "FATAL Event received, resetting device\n"); 191 ath9k_htc_reset(priv); 192 } 193 194 static void ath9k_wmi_rsp_callback(struct wmi *wmi, struct sk_buff *skb) 195 { 196 skb_pull(skb, sizeof(struct wmi_cmd_hdr)); 197 198 if (wmi->cmd_rsp_buf != NULL && wmi->cmd_rsp_len != 0) 199 memcpy(wmi->cmd_rsp_buf, skb->data, wmi->cmd_rsp_len); 200 201 complete(&wmi->cmd_wait); 202 } 203 204 static void ath9k_wmi_ctrl_rx(void *priv, struct sk_buff *skb, 205 enum htc_endpoint_id epid) 206 { 207 struct wmi *wmi = (struct wmi *) priv; 208 struct wmi_cmd_hdr *hdr; 209 u16 cmd_id; 210 211 if (unlikely(wmi->stopped)) 212 goto free_skb; 213 214 hdr = (struct wmi_cmd_hdr *) skb->data; 215 cmd_id = be16_to_cpu(hdr->command_id); 216 217 if (cmd_id & 0x1000) { 218 spin_lock(&wmi->wmi_lock); 219 __skb_queue_tail(&wmi->wmi_event_queue, skb); 220 spin_unlock(&wmi->wmi_lock); 221 tasklet_schedule(&wmi->wmi_event_tasklet); 222 return; 223 } 224 225 /* Check if there has been a timeout. */ 226 spin_lock(&wmi->wmi_lock); 227 if (cmd_id != wmi->last_cmd_id) { 228 spin_unlock(&wmi->wmi_lock); 229 goto free_skb; 230 } 231 spin_unlock(&wmi->wmi_lock); 232 233 /* WMI command response */ 234 ath9k_wmi_rsp_callback(wmi, skb); 235 236 free_skb: 237 kfree_skb(skb); 238 } 239 240 static void ath9k_wmi_ctrl_tx(void *priv, struct sk_buff *skb, 241 enum htc_endpoint_id epid, bool txok) 242 { 243 kfree_skb(skb); 244 } 245 246 int ath9k_wmi_connect(struct htc_target *htc, struct wmi *wmi, 247 enum htc_endpoint_id *wmi_ctrl_epid) 248 { 249 struct htc_service_connreq connect; 250 int ret; 251 252 wmi->htc = htc; 253 254 memset(&connect, 0, sizeof(connect)); 255 256 connect.ep_callbacks.priv = wmi; 257 connect.ep_callbacks.tx = ath9k_wmi_ctrl_tx; 258 connect.ep_callbacks.rx = ath9k_wmi_ctrl_rx; 259 connect.service_id = WMI_CONTROL_SVC; 260 261 ret = htc_connect_service(htc, &connect, &wmi->ctrl_epid); 262 if (ret) 263 return ret; 264 265 *wmi_ctrl_epid = wmi->ctrl_epid; 266 267 return 0; 268 } 269 270 static int ath9k_wmi_cmd_issue(struct wmi *wmi, 271 struct sk_buff *skb, 272 enum wmi_cmd_id cmd, u16 len) 273 { 274 struct wmi_cmd_hdr *hdr; 275 276 hdr = (struct wmi_cmd_hdr *) skb_push(skb, sizeof(struct wmi_cmd_hdr)); 277 hdr->command_id = cpu_to_be16(cmd); 278 hdr->seq_no = cpu_to_be16(++wmi->tx_seq_id); 279 280 return htc_send_epid(wmi->htc, skb, wmi->ctrl_epid); 281 } 282 283 int ath9k_wmi_cmd(struct wmi *wmi, enum wmi_cmd_id cmd_id, 284 u8 *cmd_buf, u32 cmd_len, 285 u8 *rsp_buf, u32 rsp_len, 286 u32 timeout) 287 { 288 struct ath_hw *ah = wmi->drv_priv->ah; 289 struct ath_common *common = ath9k_hw_common(ah); 290 u16 headroom = sizeof(struct htc_frame_hdr) + 291 sizeof(struct wmi_cmd_hdr); 292 struct sk_buff *skb; 293 u8 *data; 294 int time_left, ret = 0; 295 unsigned long flags; 296 297 if (ah->ah_flags & AH_UNPLUGGED) 298 return 0; 299 300 skb = alloc_skb(headroom + cmd_len, GFP_ATOMIC); 301 if (!skb) 302 return -ENOMEM; 303 304 skb_reserve(skb, headroom); 305 306 if (cmd_len != 0 && cmd_buf != NULL) { 307 data = (u8 *) skb_put(skb, cmd_len); 308 memcpy(data, cmd_buf, cmd_len); 309 } 310 311 mutex_lock(&wmi->op_mutex); 312 313 /* check if wmi stopped flag is set */ 314 if (unlikely(wmi->stopped)) { 315 ret = -EPROTO; 316 goto out; 317 } 318 319 /* record the rsp buffer and length */ 320 wmi->cmd_rsp_buf = rsp_buf; 321 wmi->cmd_rsp_len = rsp_len; 322 323 spin_lock_irqsave(&wmi->wmi_lock, flags); 324 wmi->last_cmd_id = cmd_id; 325 spin_unlock_irqrestore(&wmi->wmi_lock, flags); 326 327 ret = ath9k_wmi_cmd_issue(wmi, skb, cmd_id, cmd_len); 328 if (ret) 329 goto out; 330 331 time_left = wait_for_completion_timeout(&wmi->cmd_wait, timeout); 332 if (!time_left) { 333 ath_dbg(common, WMI, "Timeout waiting for WMI command: %s\n", 334 wmi_cmd_to_name(cmd_id)); 335 mutex_unlock(&wmi->op_mutex); 336 return -ETIMEDOUT; 337 } 338 339 mutex_unlock(&wmi->op_mutex); 340 341 return 0; 342 343 out: 344 ath_dbg(common, WMI, "WMI failure for: %s\n", wmi_cmd_to_name(cmd_id)); 345 mutex_unlock(&wmi->op_mutex); 346 kfree_skb(skb); 347 348 return ret; 349 } 350