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