drivers/net/wireless/ath/ath9k/wmi.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 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_TGT_STATS_CMDID:
  71                 return "WMI_TGT_STATS_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_AGGR_LIMIT_CMD:
  77                 return "WMI_AGGR_LIMIT_CMD";
  78         }
  79
  80         return "Bogus";
  81 }
  82
  83 struct wmi *ath9k_init_wmi(struct ath9k_htc_priv *priv)
  84 {
  85         struct wmi *wmi;
  86
  87         wmi = kzalloc(sizeof(struct wmi), GFP_KERNEL);
  88         if (!wmi)
  89                 return NULL;
  90
  91         wmi->drv_priv = priv;
  92         wmi->stopped = false;
  93         skb_queue_head_init(&wmi->wmi_event_queue);
  94         spin_lock_init(&wmi->wmi_lock);
  95         spin_lock_init(&wmi->event_lock);
  96         mutex_init(&wmi->op_mutex);
  97         mutex_init(&wmi->multi_write_mutex);
  98         init_completion(&wmi->cmd_wait);
  99         INIT_LIST_HEAD(&wmi->pending_tx_events);
 100         tasklet_init(&wmi->wmi_event_tasklet, ath9k_wmi_event_tasklet,
 101                      (unsigned long)wmi);
 102
 103         return wmi;
 104 }
 105
 106 void ath9k_deinit_wmi(struct ath9k_htc_priv *priv)
 107 {
 108         struct wmi *wmi = priv->wmi;
 109
 110         mutex_lock(&wmi->op_mutex);
 111         wmi->stopped = true;
 112         mutex_unlock(&wmi->op_mutex);
 113
 114         kfree(priv->wmi);
 115 }
 116
 117 void ath9k_wmi_event_drain(struct ath9k_htc_priv *priv)
 118 {
 119         unsigned long flags;
 120
 121         tasklet_kill(&priv->wmi->wmi_event_tasklet);
 122         spin_lock_irqsave(&priv->wmi->wmi_lock, flags);
 123         __skb_queue_purge(&priv->wmi->wmi_event_queue);
 124         spin_unlock_irqrestore(&priv->wmi->wmi_lock, flags);
 125 }
 126
 127 void ath9k_wmi_event_tasklet(unsigned long data)
 128 {
 129         struct wmi *wmi = (struct wmi *)data;
 130         struct ath9k_htc_priv *priv = wmi->drv_priv;
 131         struct wmi_cmd_hdr *hdr;
 132         void *wmi_event;
 133         struct wmi_event_swba *swba;
 134         struct sk_buff *skb = NULL;
 135         unsigned long flags;
 136         u16 cmd_id;
 137 #ifdef CONFIG_ATH9K_HTC_DEBUGFS
 138         __be32 txrate;
 139 #endif
 140
 141         do {
 142                 spin_lock_irqsave(&wmi->wmi_lock, flags);
 143                 skb = __skb_dequeue(&wmi->wmi_event_queue);
 144                 if (!skb) {
 145                         spin_unlock_irqrestore(&wmi->wmi_lock, flags);
 146                         return;
 147                 }
 148                 spin_unlock_irqrestore(&wmi->wmi_lock, flags);
 149
 150                 hdr = (struct wmi_cmd_hdr *) skb->data;
 151                 cmd_id = be16_to_cpu(hdr->command_id);
 152                 wmi_event = skb_pull(skb, sizeof(struct wmi_cmd_hdr));
 153
 154                 switch (cmd_id) {
 155                 case WMI_SWBA_EVENTID:
 156                         swba = (struct wmi_event_swba *) wmi_event;
 157                         ath9k_htc_swba(priv, swba);
 158                         break;
 159                 case WMI_FATAL_EVENTID:
 160                         ieee80211_queue_work(wmi->drv_priv->hw,
 161                                              &wmi->drv_priv->fatal_work);
 162                         break;
 163                 case WMI_TXRATE_EVENTID:
 164 #ifdef CONFIG_ATH9K_HTC_DEBUGFS
 165                         txrate = ((struct wmi_event_txrate *)wmi_event)->txrate;
 166                         wmi->drv_priv->debug.txrate = be32_to_cpu(txrate);
 167 #endif
 168                         break;
 169                 case WMI_TXSTATUS_EVENTID:
 170                         spin_lock_bh(&priv->tx.tx_lock);
 171                         if (priv->tx.flags & ATH9K_HTC_OP_TX_DRAIN) {
 172                                 spin_unlock_bh(&priv->tx.tx_lock);
 173                                 break;
 174                         }
 175                         spin_unlock_bh(&priv->tx.tx_lock);
 176
 177                         ath9k_htc_txstatus(priv, wmi_event);
 178                         break;
 179                 default:
 180                         break;
 181                 }
 182
 183                 kfree_skb(skb);
 184         } while (1);
 185 }
 186
 187 void ath9k_fatal_work(struct work_struct *work)
 188 {
 189         struct ath9k_htc_priv *priv = container_of(work, struct ath9k_htc_priv,
 190                                                    fatal_work);
 191         struct ath_common *common = ath9k_hw_common(priv->ah);
 192
 193         ath_dbg(common, ATH_DBG_FATAL, "FATAL Event received, resetting device\n");
 194         ath9k_htc_reset(priv);
 195 }
 196
 197 static void ath9k_wmi_rsp_callback(struct wmi *wmi, struct sk_buff *skb)
 198 {
 199         skb_pull(skb, sizeof(struct wmi_cmd_hdr));
 200
 201         if (wmi->cmd_rsp_buf != NULL && wmi->cmd_rsp_len != 0)
 202                 memcpy(wmi->cmd_rsp_buf, skb->data, wmi->cmd_rsp_len);
 203
 204         complete(&wmi->cmd_wait);
 205 }
 206
 207 static void ath9k_wmi_ctrl_rx(void *priv, struct sk_buff *skb,
 208                               enum htc_endpoint_id epid)
 209 {
 210         struct wmi *wmi = (struct wmi *) priv;
 211         struct wmi_cmd_hdr *hdr;
 212         u16 cmd_id;
 213
 214         if (unlikely(wmi->stopped))
 215                 goto free_skb;
 216
 217         hdr = (struct wmi_cmd_hdr *) skb->data;
 218         cmd_id = be16_to_cpu(hdr->command_id);
 219
 220         if (cmd_id & 0x1000) {
 221                 spin_lock(&wmi->wmi_lock);
 222                 __skb_queue_tail(&wmi->wmi_event_queue, skb);
 223                 spin_unlock(&wmi->wmi_lock);
 224                 tasklet_schedule(&wmi->wmi_event_tasklet);
 225                 return;
 226         }
 227
 228         /* Check if there has been a timeout. */
 229         spin_lock(&wmi->wmi_lock);
 230         if (cmd_id != wmi->last_cmd_id) {
 231                 spin_unlock(&wmi->wmi_lock);
 232                 goto free_skb;
 233         }
 234         spin_unlock(&wmi->wmi_lock);
 235
 236         /* WMI command response */
 237         ath9k_wmi_rsp_callback(wmi, skb);
 238
 239 free_skb:
 240         kfree_skb(skb);
 241 }
 242
 243 static void ath9k_wmi_ctrl_tx(void *priv, struct sk_buff *skb,
 244                               enum htc_endpoint_id epid, bool txok)
 245 {
 246         kfree_skb(skb);
 247 }
 248
 249 int ath9k_wmi_connect(struct htc_target *htc, struct wmi *wmi,
 250                       enum htc_endpoint_id *wmi_ctrl_epid)
 251 {
 252         struct htc_service_connreq connect;
 253         int ret;
 254
 255         wmi->htc = htc;
 256
 257         memset(&connect, 0, sizeof(connect));
 258
 259         connect.ep_callbacks.priv = wmi;
 260         connect.ep_callbacks.tx = ath9k_wmi_ctrl_tx;
 261         connect.ep_callbacks.rx = ath9k_wmi_ctrl_rx;
 262         connect.service_id = WMI_CONTROL_SVC;
 263
 264         ret = htc_connect_service(htc, &connect, &wmi->ctrl_epid);
 265         if (ret)
 266                 return ret;
 267
 268         *wmi_ctrl_epid = wmi->ctrl_epid;
 269
 270         return 0;
 271 }
 272
 273 static int ath9k_wmi_cmd_issue(struct wmi *wmi,
 274                                struct sk_buff *skb,
 275                                enum wmi_cmd_id cmd, u16 len)
 276 {
 277         struct wmi_cmd_hdr *hdr;
 278
 279         hdr = (struct wmi_cmd_hdr *) skb_push(skb, sizeof(struct wmi_cmd_hdr));
 280         hdr->command_id = cpu_to_be16(cmd);
 281         hdr->seq_no = cpu_to_be16(++wmi->tx_seq_id);
 282
 283         return htc_send_epid(wmi->htc, skb, wmi->ctrl_epid);
 284 }
 285
 286 int ath9k_wmi_cmd(struct wmi *wmi, enum wmi_cmd_id cmd_id,
 287                   u8 *cmd_buf, u32 cmd_len,
 288                   u8 *rsp_buf, u32 rsp_len,
 289                   u32 timeout)
 290 {
 291         struct ath_hw *ah = wmi->drv_priv->ah;
 292         struct ath_common *common = ath9k_hw_common(ah);
 293         u16 headroom = sizeof(struct htc_frame_hdr) +
 294                        sizeof(struct wmi_cmd_hdr);
 295         struct sk_buff *skb;
 296         u8 *data;
 297         int time_left, ret = 0;
 298         unsigned long flags;
 299
 300         if (ah->ah_flags & AH_UNPLUGGED)
 301                 return 0;
 302
 303         skb = alloc_skb(headroom + cmd_len, GFP_ATOMIC);
 304         if (!skb)
 305                 return -ENOMEM;
 306
 307         skb_reserve(skb, headroom);
 308
 309         if (cmd_len != 0 && cmd_buf != NULL) {
 310                 data = (u8 *) skb_put(skb, cmd_len);
 311                 memcpy(data, cmd_buf, cmd_len);
 312         }
 313
 314         mutex_lock(&wmi->op_mutex);
 315
 316         /* check if wmi stopped flag is set */
 317         if (unlikely(wmi->stopped)) {
 318                 ret = -EPROTO;
 319                 goto out;
 320         }
 321
 322         /* record the rsp buffer and length */
 323         wmi->cmd_rsp_buf = rsp_buf;
 324         wmi->cmd_rsp_len = rsp_len;
 325
 326         spin_lock_irqsave(&wmi->wmi_lock, flags);
 327         wmi->last_cmd_id = cmd_id;
 328         spin_unlock_irqrestore(&wmi->wmi_lock, flags);
 329
 330         ret = ath9k_wmi_cmd_issue(wmi, skb, cmd_id, cmd_len);
 331         if (ret)
 332                 goto out;
 333
 334         time_left = wait_for_completion_timeout(&wmi->cmd_wait, timeout);
 335         if (!time_left) {
 336                 ath_dbg(common, ATH_DBG_WMI,
 337                         "Timeout waiting for WMI command: %s\n",
 338                         wmi_cmd_to_name(cmd_id));
 339                 mutex_unlock(&wmi->op_mutex);
 340                 return -ETIMEDOUT;
 341         }
 342
 343         mutex_unlock(&wmi->op_mutex);
 344
 345         return 0;
 346
 347 out:
 348         ath_dbg(common, ATH_DBG_WMI,
 349                 "WMI failure for: %s\n", wmi_cmd_to_name(cmd_id));
 350         mutex_unlock(&wmi->op_mutex);
 351         kfree_skb(skb);
 352
 353         return ret;
 354 }