drivers/net/wireless/ath/ath9k/wmi.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 #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_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
  91 struct 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
 114 void 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
 123 void ath9k_destroy_wmi(struct ath9k_htc_priv *priv)
 124 {
 125         kfree(priv->wmi);
 126 }
 127
 128 void 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
 138 void 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
 195 void 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
 205 static 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
 215 static 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
 252 free_skb:
 253         kfree_skb(skb);
 254 }
 255
 256 static 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
 262 int 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
 286 static 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
 310 int 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
 363 out:
 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 }