xref: /linux/drivers/net/wireless/ath/ath9k/wmi.c (revision 79790b6818e96c58fe2bffee1b418c16e64e7b80)
1 /*
2  * Copyright (c) 2010-2011 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 
wmi_cmd_to_name(enum wmi_cmd_id wmi_cmd)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_REG_RMW_CMDID:
65 		return "WMI_REG_RMW_CMDID";
66 	case WMI_RC_STATE_CHANGE_CMDID:
67 		return "WMI_RC_STATE_CHANGE_CMDID";
68 	case WMI_RC_RATE_UPDATE_CMDID:
69 		return "WMI_RC_RATE_UPDATE_CMDID";
70 	case WMI_TARGET_IC_UPDATE_CMDID:
71 		return "WMI_TARGET_IC_UPDATE_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_NODE_UPDATE_CMDID:
77 		return "WMI_NODE_UPDATE_CMDID";
78 	case WMI_INT_STATS_CMDID:
79 		return "WMI_INT_STATS_CMDID";
80 	case WMI_TX_STATS_CMDID:
81 		return "WMI_TX_STATS_CMDID";
82 	case WMI_RX_STATS_CMDID:
83 		return "WMI_RX_STATS_CMDID";
84 	case WMI_BITRATE_MASK_CMDID:
85 		return "WMI_BITRATE_MASK_CMDID";
86 	}
87 
88 	return "Bogus";
89 }
90 
ath9k_init_wmi(struct ath9k_htc_priv * priv)91 struct wmi *ath9k_init_wmi(struct ath9k_htc_priv *priv)
92 {
93 	struct wmi *wmi;
94 
95 	wmi = kzalloc(sizeof(struct wmi), GFP_KERNEL);
96 	if (!wmi)
97 		return NULL;
98 
99 	wmi->drv_priv = priv;
100 	wmi->stopped = false;
101 	skb_queue_head_init(&wmi->wmi_event_queue);
102 	spin_lock_init(&wmi->wmi_lock);
103 	spin_lock_init(&wmi->event_lock);
104 	mutex_init(&wmi->op_mutex);
105 	mutex_init(&wmi->multi_write_mutex);
106 	mutex_init(&wmi->multi_rmw_mutex);
107 	init_completion(&wmi->cmd_wait);
108 	INIT_LIST_HEAD(&wmi->pending_tx_events);
109 	tasklet_setup(&wmi->wmi_event_tasklet, ath9k_wmi_event_tasklet);
110 
111 	return wmi;
112 }
113 
ath9k_stop_wmi(struct ath9k_htc_priv * priv)114 void ath9k_stop_wmi(struct ath9k_htc_priv *priv)
115 {
116 	struct wmi *wmi = priv->wmi;
117 
118 	mutex_lock(&wmi->op_mutex);
119 	wmi->stopped = true;
120 	mutex_unlock(&wmi->op_mutex);
121 }
122 
ath9k_destroy_wmi(struct ath9k_htc_priv * priv)123 void ath9k_destroy_wmi(struct ath9k_htc_priv *priv)
124 {
125 	kfree(priv->wmi);
126 }
127 
ath9k_wmi_event_drain(struct ath9k_htc_priv * priv)128 void ath9k_wmi_event_drain(struct ath9k_htc_priv *priv)
129 {
130 	unsigned long flags;
131 
132 	tasklet_kill(&priv->wmi->wmi_event_tasklet);
133 	spin_lock_irqsave(&priv->wmi->wmi_lock, flags);
134 	__skb_queue_purge(&priv->wmi->wmi_event_queue);
135 	spin_unlock_irqrestore(&priv->wmi->wmi_lock, flags);
136 }
137 
ath9k_wmi_event_tasklet(struct tasklet_struct * t)138 void ath9k_wmi_event_tasklet(struct tasklet_struct *t)
139 {
140 	struct wmi *wmi = from_tasklet(wmi, t, wmi_event_tasklet);
141 	struct ath9k_htc_priv *priv = wmi->drv_priv;
142 	struct wmi_cmd_hdr *hdr;
143 	void *wmi_event;
144 	struct wmi_event_swba *swba;
145 	struct sk_buff *skb = NULL;
146 	unsigned long flags;
147 	u16 cmd_id;
148 
149 	do {
150 		spin_lock_irqsave(&wmi->wmi_lock, flags);
151 		skb = __skb_dequeue(&wmi->wmi_event_queue);
152 		if (!skb) {
153 			spin_unlock_irqrestore(&wmi->wmi_lock, flags);
154 			return;
155 		}
156 		spin_unlock_irqrestore(&wmi->wmi_lock, flags);
157 
158 		/* Check if ath9k_htc_probe_device() completed. */
159 		if (!data_race(priv->initialized)) {
160 			kfree_skb(skb);
161 			continue;
162 		}
163 
164 		hdr = (struct wmi_cmd_hdr *) skb->data;
165 		cmd_id = be16_to_cpu(hdr->command_id);
166 		wmi_event = skb_pull(skb, sizeof(struct wmi_cmd_hdr));
167 
168 		switch (cmd_id) {
169 		case WMI_SWBA_EVENTID:
170 			swba = wmi_event;
171 			ath9k_htc_swba(priv, swba);
172 			break;
173 		case WMI_FATAL_EVENTID:
174 			ieee80211_queue_work(wmi->drv_priv->hw,
175 					     &wmi->drv_priv->fatal_work);
176 			break;
177 		case WMI_TXSTATUS_EVENTID:
178 			spin_lock_bh(&priv->tx.tx_lock);
179 			if (priv->tx.flags & ATH9K_HTC_OP_TX_DRAIN) {
180 				spin_unlock_bh(&priv->tx.tx_lock);
181 				break;
182 			}
183 			spin_unlock_bh(&priv->tx.tx_lock);
184 
185 			ath9k_htc_txstatus(priv, wmi_event);
186 			break;
187 		default:
188 			break;
189 		}
190 
191 		kfree_skb(skb);
192 	} while (1);
193 }
194 
ath9k_fatal_work(struct work_struct * work)195 void ath9k_fatal_work(struct work_struct *work)
196 {
197 	struct ath9k_htc_priv *priv = container_of(work, struct ath9k_htc_priv,
198 						   fatal_work);
199 	struct ath_common *common = ath9k_hw_common(priv->ah);
200 
201 	ath_dbg(common, FATAL, "FATAL Event received, resetting device\n");
202 	ath9k_htc_reset(priv);
203 }
204 
ath9k_wmi_rsp_callback(struct wmi * wmi,struct sk_buff * skb)205 static void ath9k_wmi_rsp_callback(struct wmi *wmi, struct sk_buff *skb)
206 {
207 	skb_pull(skb, sizeof(struct wmi_cmd_hdr));
208 
209 	if (wmi->cmd_rsp_buf != NULL && wmi->cmd_rsp_len != 0)
210 		memcpy(wmi->cmd_rsp_buf, skb->data, wmi->cmd_rsp_len);
211 
212 	complete(&wmi->cmd_wait);
213 }
214 
ath9k_wmi_ctrl_rx(void * priv,struct sk_buff * skb,enum htc_endpoint_id epid)215 static void ath9k_wmi_ctrl_rx(void *priv, struct sk_buff *skb,
216 			      enum htc_endpoint_id epid)
217 {
218 	struct wmi *wmi = priv;
219 	struct wmi_cmd_hdr *hdr;
220 	unsigned long flags;
221 	u16 cmd_id;
222 
223 	if (unlikely(wmi->stopped))
224 		goto free_skb;
225 
226 	/* Validate the obtained SKB. */
227 	if (unlikely(skb->len < sizeof(struct wmi_cmd_hdr)))
228 		goto free_skb;
229 
230 	hdr = (struct wmi_cmd_hdr *) skb->data;
231 	cmd_id = be16_to_cpu(hdr->command_id);
232 
233 	if (cmd_id & 0x1000) {
234 		spin_lock_irqsave(&wmi->wmi_lock, flags);
235 		__skb_queue_tail(&wmi->wmi_event_queue, skb);
236 		spin_unlock_irqrestore(&wmi->wmi_lock, flags);
237 		tasklet_schedule(&wmi->wmi_event_tasklet);
238 		return;
239 	}
240 
241 	/* Check if there has been a timeout. */
242 	spin_lock_irqsave(&wmi->wmi_lock, flags);
243 	if (be16_to_cpu(hdr->seq_no) != wmi->last_seq_id) {
244 		spin_unlock_irqrestore(&wmi->wmi_lock, flags);
245 		goto free_skb;
246 	}
247 
248 	/* WMI command response */
249 	ath9k_wmi_rsp_callback(wmi, skb);
250 	spin_unlock_irqrestore(&wmi->wmi_lock, flags);
251 
252 free_skb:
253 	kfree_skb(skb);
254 }
255 
ath9k_wmi_ctrl_tx(void * priv,struct sk_buff * skb,enum htc_endpoint_id epid,bool txok)256 static void ath9k_wmi_ctrl_tx(void *priv, struct sk_buff *skb,
257 			      enum htc_endpoint_id epid, bool txok)
258 {
259 	kfree_skb(skb);
260 }
261 
ath9k_wmi_connect(struct htc_target * htc,struct wmi * wmi,enum htc_endpoint_id * wmi_ctrl_epid)262 int ath9k_wmi_connect(struct htc_target *htc, struct wmi *wmi,
263 		      enum htc_endpoint_id *wmi_ctrl_epid)
264 {
265 	struct htc_service_connreq connect;
266 	int ret;
267 
268 	wmi->htc = htc;
269 
270 	memset(&connect, 0, sizeof(connect));
271 
272 	connect.ep_callbacks.priv = wmi;
273 	connect.ep_callbacks.tx = ath9k_wmi_ctrl_tx;
274 	connect.ep_callbacks.rx = ath9k_wmi_ctrl_rx;
275 	connect.service_id = WMI_CONTROL_SVC;
276 
277 	ret = htc_connect_service(htc, &connect, &wmi->ctrl_epid);
278 	if (ret)
279 		return ret;
280 
281 	*wmi_ctrl_epid = wmi->ctrl_epid;
282 
283 	return 0;
284 }
285 
ath9k_wmi_cmd_issue(struct wmi * wmi,struct sk_buff * skb,enum wmi_cmd_id cmd,u16 len,u8 * rsp_buf,u32 rsp_len)286 static int ath9k_wmi_cmd_issue(struct wmi *wmi,
287 			       struct sk_buff *skb,
288 			       enum wmi_cmd_id cmd, u16 len,
289 			       u8 *rsp_buf, u32 rsp_len)
290 {
291 	struct wmi_cmd_hdr *hdr;
292 	unsigned long flags;
293 
294 	hdr = skb_push(skb, sizeof(struct wmi_cmd_hdr));
295 	hdr->command_id = cpu_to_be16(cmd);
296 	hdr->seq_no = cpu_to_be16(++wmi->tx_seq_id);
297 
298 	spin_lock_irqsave(&wmi->wmi_lock, flags);
299 
300 	/* record the rsp buffer and length */
301 	wmi->cmd_rsp_buf = rsp_buf;
302 	wmi->cmd_rsp_len = rsp_len;
303 
304 	wmi->last_seq_id = wmi->tx_seq_id;
305 	spin_unlock_irqrestore(&wmi->wmi_lock, flags);
306 
307 	return htc_send_epid(wmi->htc, skb, wmi->ctrl_epid);
308 }
309 
ath9k_wmi_cmd(struct wmi * wmi,enum wmi_cmd_id cmd_id,u8 * cmd_buf,u32 cmd_len,u8 * rsp_buf,u32 rsp_len,u32 timeout)310 int ath9k_wmi_cmd(struct wmi *wmi, enum wmi_cmd_id cmd_id,
311 		  u8 *cmd_buf, u32 cmd_len,
312 		  u8 *rsp_buf, u32 rsp_len,
313 		  u32 timeout)
314 {
315 	struct ath_hw *ah = wmi->drv_priv->ah;
316 	struct ath_common *common = ath9k_hw_common(ah);
317 	u16 headroom = sizeof(struct htc_frame_hdr) +
318 		       sizeof(struct wmi_cmd_hdr);
319 	unsigned long time_left, flags;
320 	struct sk_buff *skb;
321 	int ret = 0;
322 
323 	if (ah->ah_flags & AH_UNPLUGGED)
324 		return 0;
325 
326 	skb = alloc_skb(headroom + cmd_len, GFP_ATOMIC);
327 	if (!skb)
328 		return -ENOMEM;
329 
330 	skb_reserve(skb, headroom);
331 
332 	if (cmd_len != 0 && cmd_buf != NULL) {
333 		skb_put_data(skb, cmd_buf, cmd_len);
334 	}
335 
336 	mutex_lock(&wmi->op_mutex);
337 
338 	/* check if wmi stopped flag is set */
339 	if (unlikely(wmi->stopped)) {
340 		ret = -EPROTO;
341 		goto out;
342 	}
343 
344 	ret = ath9k_wmi_cmd_issue(wmi, skb, cmd_id, cmd_len, rsp_buf, rsp_len);
345 	if (ret)
346 		goto out;
347 
348 	time_left = wait_for_completion_timeout(&wmi->cmd_wait, timeout);
349 	if (!time_left) {
350 		ath_dbg(common, WMI, "Timeout waiting for WMI command: %s\n",
351 			wmi_cmd_to_name(cmd_id));
352 		spin_lock_irqsave(&wmi->wmi_lock, flags);
353 		wmi->last_seq_id = 0;
354 		spin_unlock_irqrestore(&wmi->wmi_lock, flags);
355 		mutex_unlock(&wmi->op_mutex);
356 		return -ETIMEDOUT;
357 	}
358 
359 	mutex_unlock(&wmi->op_mutex);
360 
361 	return 0;
362 
363 out:
364 	ath_dbg(common, WMI, "WMI failure for: %s\n", wmi_cmd_to_name(cmd_id));
365 	mutex_unlock(&wmi->op_mutex);
366 	kfree_skb(skb);
367 
368 	return ret;
369 }
370