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
 127         ath9k_htc_swba(priv, priv->wmi->beacon_pending);
 128 }
 129
 130 void ath9k_fatal_work(struct work_struct *work)
 131 {
 132         struct ath9k_htc_priv *priv = container_of(work, struct ath9k_htc_priv,
 133                                                    fatal_work);
 134         struct ath_common *common = ath9k_hw_common(priv->ah);
 135
 136         ath_dbg(common, ATH_DBG_FATAL, "FATAL Event received, resetting device\n");
 137         ath9k_htc_reset(priv);
 138 }
 139
 140 static void ath9k_wmi_rsp_callback(struct wmi *wmi, struct sk_buff *skb)
 141 {
 142         skb_pull(skb, sizeof(struct wmi_cmd_hdr));
 143
 144         if (wmi->cmd_rsp_buf != NULL && wmi->cmd_rsp_len != 0)
 145                 memcpy(wmi->cmd_rsp_buf, skb->data, wmi->cmd_rsp_len);
 146
 147         complete(&wmi->cmd_wait);
 148 }
 149
 150 static void ath9k_wmi_ctrl_rx(void *priv, struct sk_buff *skb,
 151                               enum htc_endpoint_id epid)
 152 {
 153         struct wmi *wmi = (struct wmi *) priv;
 154         struct wmi_cmd_hdr *hdr;
 155         u16 cmd_id;
 156         void *wmi_event;
 157 #ifdef CONFIG_ATH9K_HTC_DEBUGFS
 158         __be32 txrate;
 159 #endif
 160
 161         if (unlikely(wmi->stopped))
 162                 goto free_skb;
 163
 164         hdr = (struct wmi_cmd_hdr *) skb->data;
 165         cmd_id = be16_to_cpu(hdr->command_id);
 166
 167         if (cmd_id & 0x1000) {
 168                 wmi_event = skb_pull(skb, sizeof(struct wmi_cmd_hdr));
 169                 switch (cmd_id) {
 170                 case WMI_SWBA_EVENTID:
 171                         wmi->beacon_pending = *(u8 *)wmi_event;
 172                         tasklet_schedule(&wmi->drv_priv->swba_tasklet);
 173                         break;
 174                 case WMI_FATAL_EVENTID:
 175                         ieee80211_queue_work(wmi->drv_priv->hw,
 176                                              &wmi->drv_priv->fatal_work);
 177                         break;
 178                 case WMI_TXRATE_EVENTID:
 179 #ifdef CONFIG_ATH9K_HTC_DEBUGFS
 180                         txrate = ((struct wmi_event_txrate *)wmi_event)->txrate;
 181                         wmi->drv_priv->debug.txrate = be32_to_cpu(txrate);
 182 #endif
 183                         break;
 184                 default:
 185                         break;
 186                 }
 187                 kfree_skb(skb);
 188                 return;
 189         }
 190
 191         /* Check if there has been a timeout. */
 192         spin_lock(&wmi->wmi_lock);
 193         if (cmd_id != wmi->last_cmd_id) {
 194                 spin_unlock(&wmi->wmi_lock);
 195                 goto free_skb;
 196         }
 197         spin_unlock(&wmi->wmi_lock);
 198
 199         /* WMI command response */
 200         ath9k_wmi_rsp_callback(wmi, skb);
 201
 202 free_skb:
 203         kfree_skb(skb);
 204 }
 205
 206 static void ath9k_wmi_ctrl_tx(void *priv, struct sk_buff *skb,
 207                               enum htc_endpoint_id epid, bool txok)
 208 {
 209         kfree_skb(skb);
 210 }
 211
 212 int ath9k_wmi_connect(struct htc_target *htc, struct wmi *wmi,
 213                       enum htc_endpoint_id *wmi_ctrl_epid)
 214 {
 215         struct htc_service_connreq connect;
 216         int ret;
 217
 218         wmi->htc = htc;
 219
 220         memset(&connect, 0, sizeof(connect));
 221
 222         connect.ep_callbacks.priv = wmi;
 223         connect.ep_callbacks.tx = ath9k_wmi_ctrl_tx;
 224         connect.ep_callbacks.rx = ath9k_wmi_ctrl_rx;
 225         connect.service_id = WMI_CONTROL_SVC;
 226
 227         ret = htc_connect_service(htc, &connect, &wmi->ctrl_epid);
 228         if (ret)
 229                 return ret;
 230
 231         *wmi_ctrl_epid = wmi->ctrl_epid;
 232
 233         return 0;
 234 }
 235
 236 static int ath9k_wmi_cmd_issue(struct wmi *wmi,
 237                                struct sk_buff *skb,
 238                                enum wmi_cmd_id cmd, u16 len)
 239 {
 240         struct wmi_cmd_hdr *hdr;
 241
 242         hdr = (struct wmi_cmd_hdr *) skb_push(skb, sizeof(struct wmi_cmd_hdr));
 243         hdr->command_id = cpu_to_be16(cmd);
 244         hdr->seq_no = cpu_to_be16(++wmi->tx_seq_id);
 245
 246         return htc_send(wmi->htc, skb, wmi->ctrl_epid, NULL);
 247 }
 248
 249 int ath9k_wmi_cmd(struct wmi *wmi, enum wmi_cmd_id cmd_id,
 250                   u8 *cmd_buf, u32 cmd_len,
 251                   u8 *rsp_buf, u32 rsp_len,
 252                   u32 timeout)
 253 {
 254         struct ath_hw *ah = wmi->drv_priv->ah;
 255         struct ath_common *common = ath9k_hw_common(ah);
 256         u16 headroom = sizeof(struct htc_frame_hdr) +
 257                        sizeof(struct wmi_cmd_hdr);
 258         struct sk_buff *skb;
 259         u8 *data;
 260         int time_left, ret = 0;
 261         unsigned long flags;
 262
 263         if (ah->ah_flags & AH_UNPLUGGED)
 264                 return 0;
 265
 266         skb = alloc_skb(headroom + cmd_len, GFP_ATOMIC);
 267         if (!skb)
 268                 return -ENOMEM;
 269
 270         skb_reserve(skb, headroom);
 271
 272         if (cmd_len != 0 && cmd_buf != NULL) {
 273                 data = (u8 *) skb_put(skb, cmd_len);
 274                 memcpy(data, cmd_buf, cmd_len);
 275         }
 276
 277         mutex_lock(&wmi->op_mutex);
 278
 279         /* check if wmi stopped flag is set */
 280         if (unlikely(wmi->stopped)) {
 281                 ret = -EPROTO;
 282                 goto out;
 283         }
 284
 285         /* record the rsp buffer and length */
 286         wmi->cmd_rsp_buf = rsp_buf;
 287         wmi->cmd_rsp_len = rsp_len;
 288
 289         spin_lock_irqsave(&wmi->wmi_lock, flags);
 290         wmi->last_cmd_id = cmd_id;
 291         spin_unlock_irqrestore(&wmi->wmi_lock, flags);
 292
 293         ret = ath9k_wmi_cmd_issue(wmi, skb, cmd_id, cmd_len);
 294         if (ret)
 295                 goto out;
 296
 297         time_left = wait_for_completion_timeout(&wmi->cmd_wait, timeout);
 298         if (!time_left) {
 299                 ath_dbg(common, ATH_DBG_WMI,
 300                         "Timeout waiting for WMI command: %s\n",
 301                         wmi_cmd_to_name(cmd_id));
 302                 mutex_unlock(&wmi->op_mutex);
 303                 return -ETIMEDOUT;
 304         }
 305
 306         mutex_unlock(&wmi->op_mutex);
 307
 308         return 0;
 309
 310 out:
 311         ath_dbg(common, ATH_DBG_WMI,
 312                 "WMI failure for: %s\n", wmi_cmd_to_name(cmd_id));
 313         mutex_unlock(&wmi->op_mutex);
 314         kfree_skb(skb);
 315
 316         return ret;
 317 }