xref: /openbmc/linux/drivers/net/wireless/ath/ath9k/tx99.c (revision f7018c21)
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 
58 	skb = alloc_skb(len, GFP_KERNEL);
59 	if (!skb)
60 		return NULL;
61 
62 	skb_put(skb, len);
63 
64 	memset(skb->data, 0, len);
65 
66 	hdr = (struct ieee80211_hdr *)skb->data;
67 	hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA);
68 	hdr->duration_id = 0;
69 
70 	memcpy(hdr->addr1, hw->wiphy->perm_addr, ETH_ALEN);
71 	memcpy(hdr->addr2, hw->wiphy->perm_addr, ETH_ALEN);
72 	memcpy(hdr->addr3, hw->wiphy->perm_addr, ETH_ALEN);
73 
74 	hdr->seq_ctrl |= cpu_to_le16(sc->tx.seq_no);
75 
76 	tx_info = IEEE80211_SKB_CB(skb);
77 	memset(tx_info, 0, sizeof(*tx_info));
78 	rate = &tx_info->control.rates[0];
79 	tx_info->band = hw->conf.chandef.chan->band;
80 	tx_info->flags = IEEE80211_TX_CTL_NO_ACK;
81 	tx_info->control.vif = sc->tx99_vif;
82 	rate->count = 1;
83 	if (ah->curchan && IS_CHAN_HT(ah->curchan)) {
84 		rate->flags |= IEEE80211_TX_RC_MCS;
85 		if (IS_CHAN_HT40(ah->curchan))
86 			rate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
87 	}
88 
89 	memcpy(skb->data + sizeof(*hdr), PN9Data, sizeof(PN9Data));
90 
91 	return skb;
92 }
93 
94 static void ath9k_tx99_deinit(struct ath_softc *sc)
95 {
96 	ath_reset(sc);
97 
98 	ath9k_ps_wakeup(sc);
99 	ath9k_tx99_stop(sc);
100 	ath9k_ps_restore(sc);
101 }
102 
103 static int ath9k_tx99_init(struct ath_softc *sc)
104 {
105 	struct ieee80211_hw *hw = sc->hw;
106 	struct ath_hw *ah = sc->sc_ah;
107 	struct ath_common *common = ath9k_hw_common(ah);
108 	struct ath_tx_control txctl;
109 	int r;
110 
111 	if (test_bit(ATH_OP_INVALID, &common->op_flags)) {
112 		ath_err(common,
113 			"driver is in invalid state unable to use TX99");
114 		return -EINVAL;
115 	}
116 
117 	sc->tx99_skb = ath9k_build_tx99_skb(sc);
118 	if (!sc->tx99_skb)
119 		return -ENOMEM;
120 
121 	memset(&txctl, 0, sizeof(txctl));
122 	txctl.txq = sc->tx.txq_map[IEEE80211_AC_VO];
123 
124 	ath_reset(sc);
125 
126 	ath9k_ps_wakeup(sc);
127 
128 	ath9k_hw_disable_interrupts(ah);
129 	atomic_set(&ah->intr_ref_cnt, -1);
130 	ath_drain_all_txq(sc);
131 	ath_stoprecv(sc);
132 
133 	sc->tx99_state = true;
134 
135 	ieee80211_stop_queues(hw);
136 
137 	if (sc->tx99_power == MAX_RATE_POWER + 1)
138 		sc->tx99_power = MAX_RATE_POWER;
139 
140 	ath9k_hw_tx99_set_txpower(ah, sc->tx99_power);
141 	r = ath9k_tx99_send(sc, sc->tx99_skb, &txctl);
142 	if (r) {
143 		ath_dbg(common, XMIT, "Failed to xmit TX99 skb\n");
144 		return r;
145 	}
146 
147 	ath_dbg(common, XMIT, "TX99 xmit started using %d ( %ddBm)\n",
148 		sc->tx99_power,
149 		sc->tx99_power / 2);
150 
151 	/* We leave the harware awake as it will be chugging on */
152 
153 	return 0;
154 }
155 
156 static ssize_t read_file_tx99(struct file *file, char __user *user_buf,
157 			      size_t count, loff_t *ppos)
158 {
159 	struct ath_softc *sc = file->private_data;
160 	char buf[3];
161 	unsigned int len;
162 
163 	len = sprintf(buf, "%d\n", sc->tx99_state);
164 	return simple_read_from_buffer(user_buf, count, ppos, buf, len);
165 }
166 
167 static ssize_t write_file_tx99(struct file *file, const char __user *user_buf,
168 			       size_t count, loff_t *ppos)
169 {
170 	struct ath_softc *sc = file->private_data;
171 	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
172 	char buf[32];
173 	bool start;
174 	ssize_t len;
175 	int r;
176 
177 	if (sc->nvifs > 1)
178 		return -EOPNOTSUPP;
179 
180 	len = min(count, sizeof(buf) - 1);
181 	if (copy_from_user(buf, user_buf, len))
182 		return -EFAULT;
183 
184 	if (strtobool(buf, &start))
185 		return -EINVAL;
186 
187 	if (start == sc->tx99_state) {
188 		if (!start)
189 			return count;
190 		ath_dbg(common, XMIT, "Resetting TX99\n");
191 		ath9k_tx99_deinit(sc);
192 	}
193 
194 	if (!start) {
195 		ath9k_tx99_deinit(sc);
196 		return count;
197 	}
198 
199 	r = ath9k_tx99_init(sc);
200 	if (r)
201 		return r;
202 
203 	return count;
204 }
205 
206 static const struct file_operations fops_tx99 = {
207 	.read = read_file_tx99,
208 	.write = write_file_tx99,
209 	.open = simple_open,
210 	.owner = THIS_MODULE,
211 	.llseek = default_llseek,
212 };
213 
214 static ssize_t read_file_tx99_power(struct file *file,
215 				    char __user *user_buf,
216 				    size_t count, loff_t *ppos)
217 {
218 	struct ath_softc *sc = file->private_data;
219 	char buf[32];
220 	unsigned int len;
221 
222 	len = sprintf(buf, "%d (%d dBm)\n",
223 		      sc->tx99_power,
224 		      sc->tx99_power / 2);
225 
226 	return simple_read_from_buffer(user_buf, count, ppos, buf, len);
227 }
228 
229 static ssize_t write_file_tx99_power(struct file *file,
230 				     const char __user *user_buf,
231 				     size_t count, loff_t *ppos)
232 {
233 	struct ath_softc *sc = file->private_data;
234 	int r;
235 	u8 tx_power;
236 
237 	r = kstrtou8_from_user(user_buf, count, 0, &tx_power);
238 	if (r)
239 		return r;
240 
241 	if (tx_power > MAX_RATE_POWER)
242 		return -EINVAL;
243 
244 	sc->tx99_power = tx_power;
245 
246 	ath9k_ps_wakeup(sc);
247 	ath9k_hw_tx99_set_txpower(sc->sc_ah, sc->tx99_power);
248 	ath9k_ps_restore(sc);
249 
250 	return count;
251 }
252 
253 static const struct file_operations fops_tx99_power = {
254 	.read = read_file_tx99_power,
255 	.write = write_file_tx99_power,
256 	.open = simple_open,
257 	.owner = THIS_MODULE,
258 	.llseek = default_llseek,
259 };
260 
261 void ath9k_tx99_init_debug(struct ath_softc *sc)
262 {
263 	if (!AR_SREV_9300_20_OR_LATER(sc->sc_ah))
264 		return;
265 
266 	debugfs_create_file("tx99", S_IRUSR | S_IWUSR,
267 			    sc->debug.debugfs_phy, sc,
268 			    &fops_tx99);
269 	debugfs_create_file("tx99_power", S_IRUSR | S_IWUSR,
270 			    sc->debug.debugfs_phy, sc,
271 			    &fops_tx99_power);
272 }
273