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         }
  89
  90         return "Bogus";
  91 }
  92
  93 struct wmi *ath9k_init_wmi(struct ath9k_htc_priv *priv)
  94 {
  95         struct wmi *wmi;
  96
  97         wmi = kzalloc(sizeof(struct wmi), GFP_KERNEL);
  98         if (!wmi)
  99                 return NULL;
 100
 101         wmi->drv_priv = priv;
 102         wmi->stopped = false;
 103         mutex_init(&wmi->op_mutex);
 104         mutex_init(&wmi->multi_write_mutex);
 105         init_completion(&wmi->cmd_wait);
 106
 107         return wmi;
 108 }
 109
 110 void ath9k_deinit_wmi(struct ath9k_htc_priv *priv)
 111 {
 112         struct wmi *wmi = priv->wmi;
 113
 114         mutex_lock(&wmi->op_mutex);
 115         wmi->stopped = true;
 116         mutex_unlock(&wmi->op_mutex);
 117
 118         kfree(priv->wmi);
 119 }
 120
 121 void ath9k_wmi_tasklet(unsigned long data)
 122 {
 123         struct ath9k_htc_priv *priv = (struct ath9k_htc_priv *)data;
 124         struct ath_common *common = ath9k_hw_common(priv->ah);
 125         struct wmi_cmd_hdr *hdr;
 126         struct wmi_swba *swba_hdr;
 127         enum wmi_event_id event;
 128         struct sk_buff *skb;
 129         void *wmi_event;
 130         unsigned long flags;
 131 #ifdef CONFIG_ATH9K_HTC_DEBUGFS
 132         __be32 txrate;
 133 #endif
 134
 135         spin_lock_irqsave(&priv->wmi->wmi_lock, flags);
 136         skb = priv->wmi->wmi_skb;
 137         spin_unlock_irqrestore(&priv->wmi->wmi_lock, flags);
 138
 139         hdr = (struct wmi_cmd_hdr *) skb->data;
 140         event = be16_to_cpu(hdr->command_id);
 141         wmi_event = skb_pull(skb, sizeof(struct wmi_cmd_hdr));
 142
 143         ath_print(common, ATH_DBG_WMI,
 144                   "WMI Event: 0x%x\n", event);
 145
 146         switch (event) {
 147         case WMI_TGT_RDY_EVENTID:
 148                 break;
 149         case WMI_SWBA_EVENTID:
 150                 swba_hdr = (struct wmi_swba *) wmi_event;
 151                 ath9k_htc_swba(priv, swba_hdr->beacon_pending);
 152                 break;
 153         case WMI_FATAL_EVENTID:
 154                 break;
 155         case WMI_TXTO_EVENTID:
 156                 break;
 157         case WMI_BMISS_EVENTID:
 158                 break;
 159         case WMI_WLAN_TXCOMP_EVENTID:
 160                 break;
 161         case WMI_DELBA_EVENTID:
 162                 break;
 163         case WMI_TXRATE_EVENTID:
 164 #ifdef CONFIG_ATH9K_HTC_DEBUGFS
 165                 txrate = ((struct wmi_event_txrate *)wmi_event)->txrate;
 166                 priv->debug.txrate = be32_to_cpu(txrate);
 167 #endif
 168                 break;
 169         default:
 170                 break;
 171         }
 172
 173         kfree_skb(skb);
 174 }
 175
 176 static void ath9k_wmi_rsp_callback(struct wmi *wmi, struct sk_buff *skb)
 177 {
 178         skb_pull(skb, sizeof(struct wmi_cmd_hdr));
 179
 180         if (wmi->cmd_rsp_buf != NULL && wmi->cmd_rsp_len != 0)
 181                 memcpy(wmi->cmd_rsp_buf, skb->data, wmi->cmd_rsp_len);
 182
 183         complete(&wmi->cmd_wait);
 184 }
 185
 186 static void ath9k_wmi_ctrl_rx(void *priv, struct sk_buff *skb,
 187                               enum htc_endpoint_id epid)
 188 {
 189         struct wmi *wmi = (struct wmi *) priv;
 190         struct wmi_cmd_hdr *hdr;
 191         u16 cmd_id;
 192
 193         if (unlikely(wmi->stopped))
 194                 goto free_skb;
 195
 196         hdr = (struct wmi_cmd_hdr *) skb->data;
 197         cmd_id = be16_to_cpu(hdr->command_id);
 198
 199         if (cmd_id & 0x1000) {
 200                 spin_lock(&wmi->wmi_lock);
 201                 wmi->wmi_skb = skb;
 202                 spin_unlock(&wmi->wmi_lock);
 203                 tasklet_schedule(&wmi->drv_priv->wmi_tasklet);
 204                 return;
 205         }
 206
 207         /* Check if there has been a timeout. */
 208         spin_lock(&wmi->wmi_lock);
 209         if (cmd_id != wmi->last_cmd_id) {
 210                 spin_unlock(&wmi->wmi_lock);
 211                 goto free_skb;
 212         }
 213         spin_unlock(&wmi->wmi_lock);
 214
 215         /* WMI command response */
 216         ath9k_wmi_rsp_callback(wmi, skb);
 217
 218 free_skb:
 219         kfree_skb(skb);
 220 }
 221
 222 static void ath9k_wmi_ctrl_tx(void *priv, struct sk_buff *skb,
 223                               enum htc_endpoint_id epid, bool txok)
 224 {
 225         kfree_skb(skb);
 226 }
 227
 228 int ath9k_wmi_connect(struct htc_target *htc, struct wmi *wmi,
 229                       enum htc_endpoint_id *wmi_ctrl_epid)
 230 {
 231         struct htc_service_connreq connect;
 232         int ret;
 233
 234         wmi->htc = htc;
 235
 236         memset(&connect, 0, sizeof(connect));
 237
 238         connect.ep_callbacks.priv = wmi;
 239         connect.ep_callbacks.tx = ath9k_wmi_ctrl_tx;
 240         connect.ep_callbacks.rx = ath9k_wmi_ctrl_rx;
 241         connect.service_id = WMI_CONTROL_SVC;
 242
 243         ret = htc_connect_service(htc, &connect, &wmi->ctrl_epid);
 244         if (ret)
 245                 return ret;
 246
 247         *wmi_ctrl_epid = wmi->ctrl_epid;
 248
 249         return 0;
 250 }
 251
 252 static int ath9k_wmi_cmd_issue(struct wmi *wmi,
 253                                struct sk_buff *skb,
 254                                enum wmi_cmd_id cmd, u16 len)
 255 {
 256         struct wmi_cmd_hdr *hdr;
 257
 258         hdr = (struct wmi_cmd_hdr *) skb_push(skb, sizeof(struct wmi_cmd_hdr));
 259         hdr->command_id = cpu_to_be16(cmd);
 260         hdr->seq_no = cpu_to_be16(++wmi->tx_seq_id);
 261
 262         return htc_send(wmi->htc, skb, wmi->ctrl_epid, NULL);
 263 }
 264
 265 int ath9k_wmi_cmd(struct wmi *wmi, enum wmi_cmd_id cmd_id,
 266                   u8 *cmd_buf, u32 cmd_len,
 267                   u8 *rsp_buf, u32 rsp_len,
 268                   u32 timeout)
 269 {
 270         struct ath_hw *ah = wmi->drv_priv->ah;
 271         struct ath_common *common = ath9k_hw_common(ah);
 272         u16 headroom = sizeof(struct htc_frame_hdr) +
 273                        sizeof(struct wmi_cmd_hdr);
 274         struct sk_buff *skb;
 275         u8 *data;
 276         int time_left, ret = 0;
 277         unsigned long flags;
 278
 279         if (wmi->drv_priv->op_flags & OP_UNPLUGGED)
 280                 return 0;
 281
 282         skb = alloc_skb(headroom + cmd_len, GFP_ATOMIC);
 283         if (!skb)
 284                 return -ENOMEM;
 285
 286         skb_reserve(skb, headroom);
 287
 288         if (cmd_len != 0 && cmd_buf != NULL) {
 289                 data = (u8 *) skb_put(skb, cmd_len);
 290                 memcpy(data, cmd_buf, cmd_len);
 291         }
 292
 293         mutex_lock(&wmi->op_mutex);
 294
 295         /* check if wmi stopped flag is set */
 296         if (unlikely(wmi->stopped)) {
 297                 ret = -EPROTO;
 298                 goto out;
 299         }
 300
 301         /* record the rsp buffer and length */
 302         wmi->cmd_rsp_buf = rsp_buf;
 303         wmi->cmd_rsp_len = rsp_len;
 304
 305         spin_lock_irqsave(&wmi->wmi_lock, flags);
 306         wmi->last_cmd_id = cmd_id;
 307         spin_unlock_irqrestore(&wmi->wmi_lock, flags);
 308
 309         ret = ath9k_wmi_cmd_issue(wmi, skb, cmd_id, cmd_len);
 310         if (ret)
 311                 goto out;
 312
 313         time_left = wait_for_completion_timeout(&wmi->cmd_wait, timeout);
 314         if (!time_left) {
 315                 ath_print(common, ATH_DBG_WMI,
 316                           "Timeout waiting for WMI command: %s\n",
 317                           wmi_cmd_to_name(cmd_id));
 318                 mutex_unlock(&wmi->op_mutex);
 319                 return -ETIMEDOUT;
 320         }
 321
 322         mutex_unlock(&wmi->op_mutex);
 323
 324         return 0;
 325
 326 out:
 327         ath_print(common, ATH_DBG_WMI,
 328                   "WMI failure for: %s\n", wmi_cmd_to_name(cmd_id));
 329         mutex_unlock(&wmi->op_mutex);
 330         kfree_skb(skb);
 331
 332         return ret;
 333 }