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_DISABLE_INTR_CMDID:
  27                 return "WMI_DISABLE_INTR_CMDID";
  28         case WMI_ENABLE_INTR_CMDID:
  29                 return "WMI_ENABLE_INTR_CMDID";
  30         case WMI_RX_LINK_CMDID:
  31                 return "WMI_RX_LINK_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_STOP_DMA_RECV_CMDID:
  39                 return "WMI_STOP_DMA_RECV_CMDID";
  40         case WMI_ABORT_TX_DMA_CMDID:
  41                 return "WMI_ABORT_TX_DMA_CMDID";
  42         case WMI_DRAIN_TXQ_CMDID:
  43                 return "WMI_DRAIN_TXQ_CMDID";
  44         case WMI_DRAIN_TXQ_ALL_CMDID:
  45                 return "WMI_DRAIN_TXQ_ALL_CMDID";
  46         case WMI_START_RECV_CMDID:
  47                 return "WMI_START_RECV_CMDID";
  48         case WMI_STOP_RECV_CMDID:
  49                 return "WMI_STOP_RECV_CMDID";
  50         case WMI_FLUSH_RECV_CMDID:
  51                 return "WMI_FLUSH_RECV_CMDID";
  52         case WMI_SET_MODE_CMDID:
  53                 return "WMI_SET_MODE_CMDID";
  54         case WMI_RESET_CMDID:
  55                 return "WMI_RESET_CMDID";
  56         case WMI_NODE_CREATE_CMDID:
  57                 return "WMI_NODE_CREATE_CMDID";
  58         case WMI_NODE_REMOVE_CMDID:
  59                 return "WMI_NODE_REMOVE_CMDID";
  60         case WMI_VAP_REMOVE_CMDID:
  61                 return "WMI_VAP_REMOVE_CMDID";
  62         case WMI_VAP_CREATE_CMDID:
  63                 return "WMI_VAP_CREATE_CMDID";
  64         case WMI_BEACON_UPDATE_CMDID:
  65                 return "WMI_BEACON_UPDATE_CMDID";
  66         case WMI_REG_READ_CMDID:
  67                 return "WMI_REG_READ_CMDID";
  68         case WMI_REG_WRITE_CMDID:
  69                 return "WMI_REG_WRITE_CMDID";
  70         case WMI_RC_STATE_CHANGE_CMDID:
  71                 return "WMI_RC_STATE_CHANGE_CMDID";
  72         case WMI_RC_RATE_UPDATE_CMDID:
  73                 return "WMI_RC_RATE_UPDATE_CMDID";
  74         case WMI_DEBUG_INFO_CMDID:
  75                 return "WMI_DEBUG_INFO_CMDID";
  76         case WMI_HOST_ATTACH:
  77                 return "WMI_HOST_ATTACH";
  78         case WMI_TARGET_IC_UPDATE_CMDID:
  79                 return "WMI_TARGET_IC_UPDATE_CMDID";
  80         case WMI_TGT_STATS_CMDID:
  81                 return "WMI_TGT_STATS_CMDID";
  82         case WMI_TX_AGGR_ENABLE_CMDID:
  83                 return "WMI_TX_AGGR_ENABLE_CMDID";
  84         case WMI_TGT_DETACH_CMDID:
  85                 return "WMI_TGT_DETACH_CMDID";
  86         case WMI_TGT_TXQ_ENABLE_CMDID:
  87                 return "WMI_TGT_TXQ_ENABLE_CMDID";
  88         case WMI_AGGR_LIMIT_CMD:
  89                 return "WMI_AGGR_LIMIT_CMD";
  90         }
  91
  92         return "Bogus";
  93 }
  94
  95 struct wmi *ath9k_init_wmi(struct ath9k_htc_priv *priv)
  96 {
  97         struct wmi *wmi;
  98
  99         wmi = kzalloc(sizeof(struct wmi), GFP_KERNEL);
 100         if (!wmi)
 101                 return NULL;
 102
 103         wmi->drv_priv = priv;
 104         wmi->stopped = false;
 105         mutex_init(&wmi->op_mutex);
 106         mutex_init(&wmi->multi_write_mutex);
 107         init_completion(&wmi->cmd_wait);
 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_swba_tasklet(unsigned long data)
 124 {
 125         struct ath9k_htc_priv *priv = (struct ath9k_htc_priv *)data;
 126         struct ath_common *common = ath9k_hw_common(priv->ah);
 127
 128         ath_dbg(common, ATH_DBG_WMI, "SWBA Event received\n");
 129
 130         ath9k_htc_swba(priv, priv->wmi->beacon_pending);
 131
 132 }
 133
 134 void ath9k_fatal_work(struct work_struct *work)
 135 {
 136         struct ath9k_htc_priv *priv = container_of(work, struct ath9k_htc_priv,
 137                                                    fatal_work);
 138         struct ath_common *common = ath9k_hw_common(priv->ah);
 139
 140         ath_dbg(common, ATH_DBG_FATAL, "FATAL Event received, resetting device\n");
 141         ath9k_htc_reset(priv);
 142 }
 143
 144 static void ath9k_wmi_rsp_callback(struct wmi *wmi, struct sk_buff *skb)
 145 {
 146         skb_pull(skb, sizeof(struct wmi_cmd_hdr));
 147
 148         if (wmi->cmd_rsp_buf != NULL && wmi->cmd_rsp_len != 0)
 149                 memcpy(wmi->cmd_rsp_buf, skb->data, wmi->cmd_rsp_len);
 150
 151         complete(&wmi->cmd_wait);
 152 }
 153
 154 static void ath9k_wmi_ctrl_rx(void *priv, struct sk_buff *skb,
 155                               enum htc_endpoint_id epid)
 156 {
 157         struct wmi *wmi = (struct wmi *) priv;
 158         struct wmi_cmd_hdr *hdr;
 159         u16 cmd_id;
 160         void *wmi_event;
 161 #ifdef CONFIG_ATH9K_HTC_DEBUGFS
 162         __be32 txrate;
 163 #endif
 164
 165         if (unlikely(wmi->stopped))
 166                 goto free_skb;
 167
 168         hdr = (struct wmi_cmd_hdr *) skb->data;
 169         cmd_id = be16_to_cpu(hdr->command_id);
 170
 171         if (cmd_id & 0x1000) {
 172                 wmi_event = skb_pull(skb, sizeof(struct wmi_cmd_hdr));
 173                 switch (cmd_id) {
 174                 case WMI_SWBA_EVENTID:
 175                         wmi->beacon_pending = *(u8 *)wmi_event;
 176                         tasklet_schedule(&wmi->drv_priv->swba_tasklet);
 177                         break;
 178                 case WMI_FATAL_EVENTID:
 179                         ieee80211_queue_work(wmi->drv_priv->hw,
 180                                              &wmi->drv_priv->fatal_work);
 181                         break;
 182                 case WMI_TXRATE_EVENTID:
 183 #ifdef CONFIG_ATH9K_HTC_DEBUGFS
 184                         txrate = ((struct wmi_event_txrate *)wmi_event)->txrate;
 185                         wmi->drv_priv->debug.txrate = be32_to_cpu(txrate);
 186 #endif
 187                         break;
 188                 default:
 189                         break;
 190                 }
 191                 kfree_skb(skb);
 192                 return;
 193         }
 194
 195         /* Check if there has been a timeout. */
 196         spin_lock(&wmi->wmi_lock);
 197         if (cmd_id != wmi->last_cmd_id) {
 198                 spin_unlock(&wmi->wmi_lock);
 199                 goto free_skb;
 200         }
 201         spin_unlock(&wmi->wmi_lock);
 202
 203         /* WMI command response */
 204         ath9k_wmi_rsp_callback(wmi, skb);
 205
 206 free_skb:
 207         kfree_skb(skb);
 208 }
 209
 210 static void ath9k_wmi_ctrl_tx(void *priv, struct sk_buff *skb,
 211                               enum htc_endpoint_id epid, bool txok)
 212 {
 213         kfree_skb(skb);
 214 }
 215
 216 int ath9k_wmi_connect(struct htc_target *htc, struct wmi *wmi,
 217                       enum htc_endpoint_id *wmi_ctrl_epid)
 218 {
 219         struct htc_service_connreq connect;
 220         int ret;
 221
 222         wmi->htc = htc;
 223
 224         memset(&connect, 0, sizeof(connect));
 225
 226         connect.ep_callbacks.priv = wmi;
 227         connect.ep_callbacks.tx = ath9k_wmi_ctrl_tx;
 228         connect.ep_callbacks.rx = ath9k_wmi_ctrl_rx;
 229         connect.service_id = WMI_CONTROL_SVC;
 230
 231         ret = htc_connect_service(htc, &connect, &wmi->ctrl_epid);
 232         if (ret)
 233                 return ret;
 234
 235         *wmi_ctrl_epid = wmi->ctrl_epid;
 236
 237         return 0;
 238 }
 239
 240 static int ath9k_wmi_cmd_issue(struct wmi *wmi,
 241                                struct sk_buff *skb,
 242                                enum wmi_cmd_id cmd, u16 len)
 243 {
 244         struct wmi_cmd_hdr *hdr;
 245
 246         hdr = (struct wmi_cmd_hdr *) skb_push(skb, sizeof(struct wmi_cmd_hdr));
 247         hdr->command_id = cpu_to_be16(cmd);
 248         hdr->seq_no = cpu_to_be16(++wmi->tx_seq_id);
 249
 250         return htc_send(wmi->htc, skb, wmi->ctrl_epid, NULL);
 251 }
 252
 253 int ath9k_wmi_cmd(struct wmi *wmi, enum wmi_cmd_id cmd_id,
 254                   u8 *cmd_buf, u32 cmd_len,
 255                   u8 *rsp_buf, u32 rsp_len,
 256                   u32 timeout)
 257 {
 258         struct ath_hw *ah = wmi->drv_priv->ah;
 259         struct ath_common *common = ath9k_hw_common(ah);
 260         u16 headroom = sizeof(struct htc_frame_hdr) +
 261                        sizeof(struct wmi_cmd_hdr);
 262         struct sk_buff *skb;
 263         u8 *data;
 264         int time_left, ret = 0;
 265         unsigned long flags;
 266
 267         if (ah->ah_flags & AH_UNPLUGGED)
 268                 return 0;
 269
 270         skb = alloc_skb(headroom + cmd_len, GFP_ATOMIC);
 271         if (!skb)
 272                 return -ENOMEM;
 273
 274         skb_reserve(skb, headroom);
 275
 276         if (cmd_len != 0 && cmd_buf != NULL) {
 277                 data = (u8 *) skb_put(skb, cmd_len);
 278                 memcpy(data, cmd_buf, cmd_len);
 279         }
 280
 281         mutex_lock(&wmi->op_mutex);
 282
 283         /* check if wmi stopped flag is set */
 284         if (unlikely(wmi->stopped)) {
 285                 ret = -EPROTO;
 286                 goto out;
 287         }
 288
 289         /* record the rsp buffer and length */
 290         wmi->cmd_rsp_buf = rsp_buf;
 291         wmi->cmd_rsp_len = rsp_len;
 292
 293         spin_lock_irqsave(&wmi->wmi_lock, flags);
 294         wmi->last_cmd_id = cmd_id;
 295         spin_unlock_irqrestore(&wmi->wmi_lock, flags);
 296
 297         ret = ath9k_wmi_cmd_issue(wmi, skb, cmd_id, cmd_len);
 298         if (ret)
 299                 goto out;
 300
 301         time_left = wait_for_completion_timeout(&wmi->cmd_wait, timeout);
 302         if (!time_left) {
 303                 ath_dbg(common, ATH_DBG_WMI,
 304                         "Timeout waiting for WMI command: %s\n",
 305                         wmi_cmd_to_name(cmd_id));
 306                 mutex_unlock(&wmi->op_mutex);
 307                 return -ETIMEDOUT;
 308         }
 309
 310         mutex_unlock(&wmi->op_mutex);
 311
 312         return 0;
 313
 314 out:
 315         ath_dbg(common, ATH_DBG_WMI,
 316                 "WMI failure for: %s\n", wmi_cmd_to_name(cmd_id));
 317         mutex_unlock(&wmi->op_mutex);
 318         kfree_skb(skb);
 319
 320         return ret;
 321 }