xref: /openbmc/linux/drivers/net/wireless/ath/ath9k/tx99.c (revision a36954f5)
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 
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 
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 	if (!sc->tx99_vif)
60 		return NULL;
61 
62 	avp = (struct ath_vif *)sc->tx99_vif->drv_priv;
63 
64 	skb = alloc_skb(len, GFP_KERNEL);
65 	if (!skb)
66 		return NULL;
67 
68 	skb_put(skb, len);
69 
70 	memset(skb->data, 0, len);
71 
72 	hdr = (struct ieee80211_hdr *)skb->data;
73 	hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA);
74 	hdr->duration_id = 0;
75 
76 	memcpy(hdr->addr1, hw->wiphy->perm_addr, ETH_ALEN);
77 	memcpy(hdr->addr2, hw->wiphy->perm_addr, ETH_ALEN);
78 	memcpy(hdr->addr3, hw->wiphy->perm_addr, ETH_ALEN);
79 
80 	hdr->seq_ctrl |= cpu_to_le16(avp->seq_no);
81 
82 	tx_info = IEEE80211_SKB_CB(skb);
83 	memset(tx_info, 0, sizeof(*tx_info));
84 	rate = &tx_info->control.rates[0];
85 	tx_info->band = sc->cur_chan->chandef.chan->band;
86 	tx_info->flags = IEEE80211_TX_CTL_NO_ACK;
87 	tx_info->control.vif = sc->tx99_vif;
88 	rate->count = 1;
89 	if (ah->curchan && IS_CHAN_HT(ah->curchan)) {
90 		rate->flags |= IEEE80211_TX_RC_MCS;
91 		if (IS_CHAN_HT40(ah->curchan))
92 			rate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
93 	}
94 
95 	memcpy(skb->data + sizeof(*hdr), PN9Data, sizeof(PN9Data));
96 
97 	return skb;
98 }
99 
100 static void ath9k_tx99_deinit(struct ath_softc *sc)
101 {
102 	ath_reset(sc, NULL);
103 
104 	ath9k_ps_wakeup(sc);
105 	ath9k_tx99_stop(sc);
106 	ath9k_ps_restore(sc);
107 }
108 
109 static int ath9k_tx99_init(struct ath_softc *sc)
110 {
111 	struct ieee80211_hw *hw = sc->hw;
112 	struct ath_hw *ah = sc->sc_ah;
113 	struct ath_common *common = ath9k_hw_common(ah);
114 	struct ath_tx_control txctl;
115 	int r;
116 
117 	if (test_bit(ATH_OP_INVALID, &common->op_flags)) {
118 		ath_err(common,
119 			"driver is in invalid state unable to use TX99");
120 		return -EINVAL;
121 	}
122 
123 	sc->tx99_skb = ath9k_build_tx99_skb(sc);
124 	if (!sc->tx99_skb)
125 		return -ENOMEM;
126 
127 	memset(&txctl, 0, sizeof(txctl));
128 	txctl.txq = sc->tx.txq_map[IEEE80211_AC_VO];
129 
130 	ath_reset(sc, NULL);
131 
132 	ath9k_ps_wakeup(sc);
133 
134 	ath9k_hw_disable_interrupts(ah);
135 	ath_drain_all_txq(sc);
136 	ath_stoprecv(sc);
137 
138 	sc->tx99_state = true;
139 
140 	ieee80211_stop_queues(hw);
141 
142 	if (sc->tx99_power == MAX_RATE_POWER + 1)
143 		sc->tx99_power = MAX_RATE_POWER;
144 
145 	ath9k_hw_tx99_set_txpower(ah, sc->tx99_power);
146 	r = ath9k_tx99_send(sc, sc->tx99_skb, &txctl);
147 	if (r) {
148 		ath_dbg(common, XMIT, "Failed to xmit TX99 skb\n");
149 		return r;
150 	}
151 
152 	ath_dbg(common, XMIT, "TX99 xmit started using %d ( %ddBm)\n",
153 		sc->tx99_power,
154 		sc->tx99_power / 2);
155 
156 	/* We leave the harware awake as it will be chugging on */
157 
158 	return 0;
159 }
160 
161 static ssize_t read_file_tx99(struct file *file, char __user *user_buf,
162 			      size_t count, loff_t *ppos)
163 {
164 	struct ath_softc *sc = file->private_data;
165 	char buf[3];
166 	unsigned int len;
167 
168 	len = sprintf(buf, "%d\n", sc->tx99_state);
169 	return simple_read_from_buffer(user_buf, count, ppos, buf, len);
170 }
171 
172 static ssize_t write_file_tx99(struct file *file, const char __user *user_buf,
173 			       size_t count, loff_t *ppos)
174 {
175 	struct ath_softc *sc = file->private_data;
176 	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
177 	char buf[32];
178 	bool start;
179 	ssize_t len;
180 	int r;
181 
182 	if (sc->cur_chan->nvifs > 1)
183 		return -EOPNOTSUPP;
184 
185 	len = min(count, sizeof(buf) - 1);
186 	if (copy_from_user(buf, user_buf, len))
187 		return -EFAULT;
188 
189 	if (strtobool(buf, &start))
190 		return -EINVAL;
191 
192 	if (start == sc->tx99_state) {
193 		if (!start)
194 			return count;
195 		ath_dbg(common, XMIT, "Resetting TX99\n");
196 		ath9k_tx99_deinit(sc);
197 	}
198 
199 	if (!start) {
200 		ath9k_tx99_deinit(sc);
201 		return count;
202 	}
203 
204 	r = ath9k_tx99_init(sc);
205 	if (r)
206 		return r;
207 
208 	return count;
209 }
210 
211 static const struct file_operations fops_tx99 = {
212 	.read = read_file_tx99,
213 	.write = write_file_tx99,
214 	.open = simple_open,
215 	.owner = THIS_MODULE,
216 	.llseek = default_llseek,
217 };
218 
219 static ssize_t read_file_tx99_power(struct file *file,
220 				    char __user *user_buf,
221 				    size_t count, loff_t *ppos)
222 {
223 	struct ath_softc *sc = file->private_data;
224 	char buf[32];
225 	unsigned int len;
226 
227 	len = sprintf(buf, "%d (%d dBm)\n",
228 		      sc->tx99_power,
229 		      sc->tx99_power / 2);
230 
231 	return simple_read_from_buffer(user_buf, count, ppos, buf, len);
232 }
233 
234 static ssize_t write_file_tx99_power(struct file *file,
235 				     const char __user *user_buf,
236 				     size_t count, loff_t *ppos)
237 {
238 	struct ath_softc *sc = file->private_data;
239 	int r;
240 	u8 tx_power;
241 
242 	r = kstrtou8_from_user(user_buf, count, 0, &tx_power);
243 	if (r)
244 		return r;
245 
246 	if (tx_power > MAX_RATE_POWER)
247 		return -EINVAL;
248 
249 	sc->tx99_power = tx_power;
250 
251 	ath9k_ps_wakeup(sc);
252 	ath9k_hw_tx99_set_txpower(sc->sc_ah, sc->tx99_power);
253 	ath9k_ps_restore(sc);
254 
255 	return count;
256 }
257 
258 static const struct file_operations fops_tx99_power = {
259 	.read = read_file_tx99_power,
260 	.write = write_file_tx99_power,
261 	.open = simple_open,
262 	.owner = THIS_MODULE,
263 	.llseek = default_llseek,
264 };
265 
266 void ath9k_tx99_init_debug(struct ath_softc *sc)
267 {
268 	if (!AR_SREV_9280_20_OR_LATER(sc->sc_ah))
269 		return;
270 
271 	debugfs_create_file("tx99", S_IRUSR | S_IWUSR,
272 			    sc->debug.debugfs_phy, sc,
273 			    &fops_tx99);
274 	debugfs_create_file("tx99_power", S_IRUSR | S_IWUSR,
275 			    sc->debug.debugfs_phy, sc,
276 			    &fops_tx99_power);
277 }
278