1 // SPDX-License-Identifier: ISC
2 /*
3 * Copyright (C) 2018 Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>
4 */
5
6 #include "mt76x02_usb.h"
7
mt76x02u_remove_dma_hdr(struct sk_buff * skb)8 static void mt76x02u_remove_dma_hdr(struct sk_buff *skb)
9 {
10 int hdr_len;
11
12 skb_pull(skb, sizeof(struct mt76x02_txwi) + MT_DMA_HDR_LEN);
13 hdr_len = ieee80211_get_hdrlen_from_skb(skb);
14 if (hdr_len % 4)
15 mt76x02_remove_hdr_pad(skb, 2);
16 }
17
mt76x02u_tx_complete_skb(struct mt76_dev * mdev,enum mt76_txq_id qid,struct mt76_queue_entry * e)18 void mt76x02u_tx_complete_skb(struct mt76_dev *mdev, enum mt76_txq_id qid,
19 struct mt76_queue_entry *e)
20 {
21 mt76x02u_remove_dma_hdr(e->skb);
22 mt76_tx_complete_skb(mdev, e->skb);
23 }
24 EXPORT_SYMBOL_GPL(mt76x02u_tx_complete_skb);
25
mt76x02u_skb_dma_info(struct sk_buff * skb,int port,u32 flags)26 int mt76x02u_skb_dma_info(struct sk_buff *skb, int port, u32 flags)
27 {
28 struct sk_buff *iter, *last = skb;
29 u32 info, pad;
30
31 /* Buffer layout:
32 * | 4B | xfer len | pad | 4B |
33 * | TXINFO | pkt/cmd | zero pad to 4B | zero |
34 *
35 * length field of TXINFO should be set to 'xfer len'.
36 */
37 info = FIELD_PREP(MT_TXD_INFO_LEN, round_up(skb->len, 4)) |
38 FIELD_PREP(MT_TXD_INFO_DPORT, port) | flags;
39 put_unaligned_le32(info, skb_push(skb, sizeof(info)));
40
41 /* Add zero pad of 4 - 7 bytes */
42 pad = round_up(skb->len, 4) + 4 - skb->len;
43
44 /* First packet of a A-MSDU burst keeps track of the whole burst
45 * length, need to update length of it and the last packet.
46 */
47 skb_walk_frags(skb, iter) {
48 last = iter;
49 if (!iter->next) {
50 skb->data_len += pad;
51 skb->len += pad;
52 break;
53 }
54 }
55
56 if (skb_pad(last, pad))
57 return -ENOMEM;
58 __skb_put(last, pad);
59
60 return 0;
61 }
62
mt76x02u_tx_prepare_skb(struct mt76_dev * mdev,void * data,enum mt76_txq_id qid,struct mt76_wcid * wcid,struct ieee80211_sta * sta,struct mt76_tx_info * tx_info)63 int mt76x02u_tx_prepare_skb(struct mt76_dev *mdev, void *data,
64 enum mt76_txq_id qid, struct mt76_wcid *wcid,
65 struct ieee80211_sta *sta,
66 struct mt76_tx_info *tx_info)
67 {
68 struct mt76x02_dev *dev = container_of(mdev, struct mt76x02_dev, mt76);
69 int pid, len = tx_info->skb->len, ep = q2ep(mdev->q_tx[qid].q->hw_idx);
70 struct mt76x02_txwi *txwi;
71 bool ampdu = IEEE80211_SKB_CB(tx_info->skb)->flags & IEEE80211_TX_CTL_AMPDU;
72 enum mt76_qsel qsel;
73 u32 flags;
74
75 mt76_insert_hdr_pad(tx_info->skb);
76
77 txwi = (struct mt76x02_txwi *)(tx_info->skb->data - sizeof(*txwi));
78 mt76x02_mac_write_txwi(dev, txwi, tx_info->skb, wcid, sta, len);
79 skb_push(tx_info->skb, sizeof(*txwi));
80
81 pid = mt76_tx_status_skb_add(mdev, wcid, tx_info->skb);
82
83 /* encode packet rate for no-skb packet id to fix up status reporting */
84 if (pid == MT_PACKET_ID_NO_SKB)
85 pid = MT_PACKET_ID_HAS_RATE |
86 (le16_to_cpu(txwi->rate) & MT_RXWI_RATE_INDEX);
87
88 txwi->pktid = pid;
89
90 if ((mt76_is_skb_pktid(pid) && ampdu) || ep == MT_EP_OUT_HCCA)
91 qsel = MT_QSEL_MGMT;
92 else
93 qsel = MT_QSEL_EDCA;
94
95 flags = FIELD_PREP(MT_TXD_INFO_QSEL, qsel) |
96 MT_TXD_INFO_80211;
97 if (!wcid || wcid->hw_key_idx == 0xff || wcid->sw_iv)
98 flags |= MT_TXD_INFO_WIV;
99
100 return mt76x02u_skb_dma_info(tx_info->skb, WLAN_PORT, flags);
101 }
102 EXPORT_SYMBOL_GPL(mt76x02u_tx_prepare_skb);
103
104 /* Trigger pre-TBTT event 8 ms before TBTT */
105 #define PRE_TBTT_USEC 8000
106
107 /* Beacon SRAM memory is limited to 8kB. We need to send PS buffered frames
108 * (which can be 1500 bytes big) via beacon memory. That make limit of number
109 * of slots to 5. TODO: dynamically calculate offsets in beacon SRAM.
110 */
111 #define N_BCN_SLOTS 5
112
mt76x02u_start_pre_tbtt_timer(struct mt76x02_dev * dev)113 static void mt76x02u_start_pre_tbtt_timer(struct mt76x02_dev *dev)
114 {
115 u64 time;
116 u32 tbtt;
117
118 /* Get remaining TBTT in usec */
119 tbtt = mt76_get_field(dev, MT_TBTT_TIMER, MT_TBTT_TIMER_VAL);
120 tbtt *= 32;
121
122 if (tbtt <= PRE_TBTT_USEC) {
123 queue_work(system_highpri_wq, &dev->pre_tbtt_work);
124 return;
125 }
126
127 time = (tbtt - PRE_TBTT_USEC) * 1000ull;
128 hrtimer_start(&dev->pre_tbtt_timer, time, HRTIMER_MODE_REL);
129 }
130
mt76x02u_restart_pre_tbtt_timer(struct mt76x02_dev * dev)131 static void mt76x02u_restart_pre_tbtt_timer(struct mt76x02_dev *dev)
132 {
133 u32 tbtt, dw0, dw1;
134 u64 tsf, time;
135
136 /* Get remaining TBTT in usec */
137 tbtt = mt76_get_field(dev, MT_TBTT_TIMER, MT_TBTT_TIMER_VAL);
138 tbtt *= 32;
139
140 dw0 = mt76_rr(dev, MT_TSF_TIMER_DW0);
141 dw1 = mt76_rr(dev, MT_TSF_TIMER_DW1);
142 tsf = (u64)dw0 << 32 | dw1;
143 dev_dbg(dev->mt76.dev, "TSF: %llu us TBTT %u us\n", tsf, tbtt);
144
145 /* Convert beacon interval in TU (1024 usec) to nsec */
146 time = ((1000000000ull * dev->mt76.beacon_int) >> 10);
147
148 /* Adjust time to trigger hrtimer 8ms before TBTT */
149 if (tbtt < PRE_TBTT_USEC)
150 time -= (PRE_TBTT_USEC - tbtt) * 1000ull;
151 else
152 time += (tbtt - PRE_TBTT_USEC) * 1000ull;
153
154 hrtimer_start(&dev->pre_tbtt_timer, time, HRTIMER_MODE_REL);
155 }
156
mt76x02u_stop_pre_tbtt_timer(struct mt76x02_dev * dev)157 static void mt76x02u_stop_pre_tbtt_timer(struct mt76x02_dev *dev)
158 {
159 do {
160 hrtimer_cancel(&dev->pre_tbtt_timer);
161 cancel_work_sync(&dev->pre_tbtt_work);
162 /* Timer can be rearmed by work. */
163 } while (hrtimer_active(&dev->pre_tbtt_timer));
164 }
165
mt76x02u_pre_tbtt_work(struct work_struct * work)166 static void mt76x02u_pre_tbtt_work(struct work_struct *work)
167 {
168 struct mt76x02_dev *dev =
169 container_of(work, struct mt76x02_dev, pre_tbtt_work);
170 struct beacon_bc_data data = {};
171 struct sk_buff *skb;
172 int i, nbeacons;
173
174 if (!dev->mt76.beacon_mask)
175 return;
176
177 if (mt76_hw(dev)->conf.flags & IEEE80211_CONF_OFFCHANNEL)
178 return;
179
180 mt76x02_resync_beacon_timer(dev);
181
182 ieee80211_iterate_active_interfaces(mt76_hw(dev),
183 IEEE80211_IFACE_ITER_RESUME_ALL,
184 mt76x02_update_beacon_iter, dev);
185
186 nbeacons = hweight8(dev->mt76.beacon_mask);
187 mt76x02_enqueue_buffered_bc(dev, &data, N_BCN_SLOTS - nbeacons);
188
189 for (i = nbeacons; i < N_BCN_SLOTS; i++) {
190 skb = __skb_dequeue(&data.q);
191 mt76x02_mac_set_beacon(dev, i, skb);
192 }
193
194 mt76x02u_restart_pre_tbtt_timer(dev);
195 }
196
mt76x02u_pre_tbtt_interrupt(struct hrtimer * timer)197 static enum hrtimer_restart mt76x02u_pre_tbtt_interrupt(struct hrtimer *timer)
198 {
199 struct mt76x02_dev *dev =
200 container_of(timer, struct mt76x02_dev, pre_tbtt_timer);
201
202 queue_work(system_highpri_wq, &dev->pre_tbtt_work);
203
204 return HRTIMER_NORESTART;
205 }
206
mt76x02u_pre_tbtt_enable(struct mt76x02_dev * dev,bool en)207 static void mt76x02u_pre_tbtt_enable(struct mt76x02_dev *dev, bool en)
208 {
209 if (en && dev->mt76.beacon_mask &&
210 !hrtimer_active(&dev->pre_tbtt_timer))
211 mt76x02u_start_pre_tbtt_timer(dev);
212 if (!en)
213 mt76x02u_stop_pre_tbtt_timer(dev);
214 }
215
mt76x02u_beacon_enable(struct mt76x02_dev * dev,bool en)216 static void mt76x02u_beacon_enable(struct mt76x02_dev *dev, bool en)
217 {
218 int i;
219
220 if (WARN_ON_ONCE(!dev->mt76.beacon_int))
221 return;
222
223 if (en) {
224 mt76x02u_start_pre_tbtt_timer(dev);
225 } else {
226 /* Timer is already stopped, only clean up
227 * PS buffered frames if any.
228 */
229 for (i = 0; i < N_BCN_SLOTS; i++)
230 mt76x02_mac_set_beacon(dev, i, NULL);
231 }
232 }
233
mt76x02u_init_beacon_config(struct mt76x02_dev * dev)234 void mt76x02u_init_beacon_config(struct mt76x02_dev *dev)
235 {
236 static const struct mt76x02_beacon_ops beacon_ops = {
237 .nslots = N_BCN_SLOTS,
238 .slot_size = (8192 / N_BCN_SLOTS) & ~63,
239 .pre_tbtt_enable = mt76x02u_pre_tbtt_enable,
240 .beacon_enable = mt76x02u_beacon_enable,
241 };
242 dev->beacon_ops = &beacon_ops;
243
244 hrtimer_init(&dev->pre_tbtt_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
245 dev->pre_tbtt_timer.function = mt76x02u_pre_tbtt_interrupt;
246 INIT_WORK(&dev->pre_tbtt_work, mt76x02u_pre_tbtt_work);
247
248 mt76x02_init_beacon_config(dev);
249 }
250 EXPORT_SYMBOL_GPL(mt76x02u_init_beacon_config);
251
mt76x02u_exit_beacon_config(struct mt76x02_dev * dev)252 void mt76x02u_exit_beacon_config(struct mt76x02_dev *dev)
253 {
254 if (!test_bit(MT76_REMOVED, &dev->mt76.state))
255 mt76_clear(dev, MT_BEACON_TIME_CFG,
256 MT_BEACON_TIME_CFG_TIMER_EN |
257 MT_BEACON_TIME_CFG_SYNC_MODE |
258 MT_BEACON_TIME_CFG_TBTT_EN |
259 MT_BEACON_TIME_CFG_BEACON_TX);
260
261 mt76x02u_stop_pre_tbtt_timer(dev);
262 }
263 EXPORT_SYMBOL_GPL(mt76x02u_exit_beacon_config);
264
