xref: /openbmc/linux/drivers/net/wireless/ath/ath9k/tx99.c (revision 8b804643)
1 /*
2  * Copyright (c) 2013 Qualcomm Atheros, 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 "ath9k.h"
18 
ath9k_tx99_stop(struct ath_softc * sc)19 static void ath9k_tx99_stop(struct ath_softc *sc)
20 {
21 	struct ath_hw *ah = sc->sc_ah;
22 	struct ath_common *common = ath9k_hw_common(ah);
23 
24 	ath_drain_all_txq(sc);
25 	ath_startrecv(sc);
26 
27 	ath9k_hw_set_interrupts(ah);
28 	ath9k_hw_enable_interrupts(ah);
29 
30 	ieee80211_wake_queues(sc->hw);
31 
32 	kfree_skb(sc->tx99_skb);
33 	sc->tx99_skb = NULL;
34 	sc->tx99_state = false;
35 
36 	ath9k_hw_tx99_stop(sc->sc_ah);
37 	ath_dbg(common, XMIT, "TX99 stopped\n");
38 }
39 
ath9k_build_tx99_skb(struct ath_softc * sc)40 static struct sk_buff *ath9k_build_tx99_skb(struct ath_softc *sc)
41 {
42 	static u8 PN9Data[] = {0xff, 0x87, 0xb8, 0x59, 0xb7, 0xa1, 0xcc, 0x24,
43 			       0x57, 0x5e, 0x4b, 0x9c, 0x0e, 0xe9, 0xea, 0x50,
44 			       0x2a, 0xbe, 0xb4, 0x1b, 0xb6, 0xb0, 0x5d, 0xf1,
45 			       0xe6, 0x9a, 0xe3, 0x45, 0xfd, 0x2c, 0x53, 0x18,
46 			       0x0c, 0xca, 0xc9, 0xfb, 0x49, 0x37, 0xe5, 0xa8,
47 			       0x51, 0x3b, 0x2f, 0x61, 0xaa, 0x72, 0x18, 0x84,
48 			       0x02, 0x23, 0x23, 0xab, 0x63, 0x89, 0x51, 0xb3,
49 			       0xe7, 0x8b, 0x72, 0x90, 0x4c, 0xe8, 0xfb, 0xc0};
50 	u32 len = 1200;
51 	struct ieee80211_tx_rate *rate;
52 	struct ieee80211_hw *hw = sc->hw;
53 	struct ath_hw *ah = sc->sc_ah;
54 	struct ieee80211_hdr *hdr;
55 	struct ieee80211_tx_info *tx_info;
56 	struct sk_buff *skb;
57 	struct ath_vif *avp;
58 
59 	skb = alloc_skb(len, GFP_KERNEL);
60 	if (!skb)
61 		return NULL;
62 
63 	skb_put(skb, len);
64 
65 	memset(skb->data, 0, len);
66 
67 	hdr = (struct ieee80211_hdr *)skb->data;
68 	hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA);
69 	hdr->duration_id = 0;
70 
71 	memcpy(hdr->addr1, hw->wiphy->perm_addr, ETH_ALEN);
72 	memcpy(hdr->addr2, hw->wiphy->perm_addr, ETH_ALEN);
73 	memcpy(hdr->addr3, hw->wiphy->perm_addr, ETH_ALEN);
74 
75 	if (sc->tx99_vif) {
76 		avp = (struct ath_vif *) sc->tx99_vif->drv_priv;
77 		hdr->seq_ctrl |= cpu_to_le16(avp->seq_no);
78 	}
79 
80 	tx_info = IEEE80211_SKB_CB(skb);
81 	memset(tx_info, 0, sizeof(*tx_info));
82 	rate = &tx_info->control.rates[0];
83 	tx_info->band = sc->cur_chan->chandef.chan->band;
84 	tx_info->flags = IEEE80211_TX_CTL_NO_ACK;
85 	tx_info->control.vif = sc->tx99_vif;
86 	rate->count = 1;
87 	if (ah->curchan && IS_CHAN_HT(ah->curchan)) {
88 		rate->flags |= IEEE80211_TX_RC_MCS;
89 		if (IS_CHAN_HT40(ah->curchan))
90 			rate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
91 	}
92 
93 	memcpy(skb->data + sizeof(*hdr), PN9Data, sizeof(PN9Data));
94 
95 	return skb;
96 }
97 
ath9k_tx99_deinit(struct ath_softc * sc)98 static void ath9k_tx99_deinit(struct ath_softc *sc)
99 {
100 	ath_reset(sc, NULL);
101 
102 	ath9k_ps_wakeup(sc);
103 	ath9k_tx99_stop(sc);
104 	ath9k_ps_restore(sc);
105 }
106 
ath9k_tx99_init(struct ath_softc * sc)107 static int ath9k_tx99_init(struct ath_softc *sc)
108 {
109 	struct ieee80211_hw *hw = sc->hw;
110 	struct ath_hw *ah = sc->sc_ah;
111 	struct ath_common *common = ath9k_hw_common(ah);
112 	struct ath_tx_control txctl;
113 	int r;
114 
115 	if (test_bit(ATH_OP_INVALID, &common->op_flags)) {
116 		ath_err(common,
117 			"driver is in invalid state unable to use TX99");
118 		return -EINVAL;
119 	}
120 
121 	sc->tx99_skb = ath9k_build_tx99_skb(sc);
122 	if (!sc->tx99_skb)
123 		return -ENOMEM;
124 
125 	memset(&txctl, 0, sizeof(txctl));
126 	txctl.txq = sc->tx.txq_map[IEEE80211_AC_VO];
127 
128 	ath_reset(sc, NULL);
129 
130 	ath9k_ps_wakeup(sc);
131 
132 	ath9k_hw_disable_interrupts(ah);
133 	ath_drain_all_txq(sc);
134 	ath_stoprecv(sc);
135 
136 	sc->tx99_state = true;
137 
138 	ieee80211_stop_queues(hw);
139 
140 	if (sc->tx99_power == MAX_RATE_POWER + 1)
141 		sc->tx99_power = MAX_RATE_POWER;
142 
143 	ath9k_hw_tx99_set_txpower(ah, sc->tx99_power);
144 	r = ath9k_tx99_send(sc, sc->tx99_skb, &txctl);
145 	if (r) {
146 		ath_dbg(common, XMIT, "Failed to xmit TX99 skb\n");
147 		return r;
148 	}
149 
150 	ath_dbg(common, XMIT, "TX99 xmit started using %d ( %ddBm)\n",
151 		sc->tx99_power,
152 		sc->tx99_power / 2);
153 
154 	/* We leave the hardware awake as it will be chugging on */
155 
156 	return 0;
157 }
158 
read_file_tx99(struct file * file,char __user * user_buf,size_t count,loff_t * ppos)159 static ssize_t read_file_tx99(struct file *file, char __user *user_buf,
160 			      size_t count, loff_t *ppos)
161 {
162 	struct ath_softc *sc = file->private_data;
163 	char buf[3];
164 	unsigned int len;
165 
166 	len = sprintf(buf, "%d\n", sc->tx99_state);
167 	return simple_read_from_buffer(user_buf, count, ppos, buf, len);
168 }
169 
write_file_tx99(struct file * file,const char __user * user_buf,size_t count,loff_t * ppos)170 static ssize_t write_file_tx99(struct file *file, const char __user *user_buf,
171 			       size_t count, loff_t *ppos)
172 {
173 	struct ath_softc *sc = file->private_data;
174 	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
175 	bool start;
176 	ssize_t ret;
177 	int r;
178 
179 	if (count < 1)
180 		return -EINVAL;
181 
182 	if (sc->cur_chan->nvifs > 1)
183 		return -EOPNOTSUPP;
184 
185 	ret = kstrtobool_from_user(user_buf, count, &start);
186 	if (ret)
187 		return ret;
188 
189 	mutex_lock(&sc->mutex);
190 
191 	if (start == sc->tx99_state) {
192 		if (!start)
193 			goto out;
194 		ath_dbg(common, XMIT, "Resetting TX99\n");
195 		ath9k_tx99_deinit(sc);
196 	}
197 
198 	if (!start) {
199 		ath9k_tx99_deinit(sc);
200 		goto out;
201 	}
202 
203 	r = ath9k_tx99_init(sc);
204 	if (r) {
205 		mutex_unlock(&sc->mutex);
206 		return r;
207 	}
208 out:
209 	mutex_unlock(&sc->mutex);
210 	return count;
211 }
212 
213 static const struct file_operations fops_tx99 = {
214 	.read = read_file_tx99,
215 	.write = write_file_tx99,
216 	.open = simple_open,
217 	.owner = THIS_MODULE,
218 	.llseek = default_llseek,
219 };
220 
read_file_tx99_power(struct file * file,char __user * user_buf,size_t count,loff_t * ppos)221 static ssize_t read_file_tx99_power(struct file *file,
222 				    char __user *user_buf,
223 				    size_t count, loff_t *ppos)
224 {
225 	struct ath_softc *sc = file->private_data;
226 	char buf[32];
227 	unsigned int len;
228 
229 	len = sprintf(buf, "%d (%d dBm)\n",
230 		      sc->tx99_power,
231 		      sc->tx99_power / 2);
232 
233 	return simple_read_from_buffer(user_buf, count, ppos, buf, len);
234 }
235 
write_file_tx99_power(struct file * file,const char __user * user_buf,size_t count,loff_t * ppos)236 static ssize_t write_file_tx99_power(struct file *file,
237 				     const char __user *user_buf,
238 				     size_t count, loff_t *ppos)
239 {
240 	struct ath_softc *sc = file->private_data;
241 	int r;
242 	u8 tx_power;
243 
244 	r = kstrtou8_from_user(user_buf, count, 0, &tx_power);
245 	if (r)
246 		return r;
247 
248 	if (tx_power > MAX_RATE_POWER)
249 		return -EINVAL;
250 
251 	sc->tx99_power = tx_power;
252 
253 	ath9k_ps_wakeup(sc);
254 	ath9k_hw_tx99_set_txpower(sc->sc_ah, sc->tx99_power);
255 	ath9k_ps_restore(sc);
256 
257 	return count;
258 }
259 
260 static const struct file_operations fops_tx99_power = {
261 	.read = read_file_tx99_power,
262 	.write = write_file_tx99_power,
263 	.open = simple_open,
264 	.owner = THIS_MODULE,
265 	.llseek = default_llseek,
266 };
267 
ath9k_tx99_init_debug(struct ath_softc * sc)268 void ath9k_tx99_init_debug(struct ath_softc *sc)
269 {
270 	if (!AR_SREV_9280_20_OR_LATER(sc->sc_ah))
271 		return;
272 
273 	debugfs_create_file("tx99", 0600,
274 			    sc->debug.debugfs_phy, sc,
275 			    &fops_tx99);
276 	debugfs_create_file("tx99_power", 0600,
277 			    sc->debug.debugfs_phy, sc,
278 			    &fops_tx99_power);
279 }
280