1// SPDX-License-Identifier: ISC
2/*
3 * Copyright (C) 2018 Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>
4 */
5
6#include "mt76x02_usb.h"
7
8static 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
18void mt76x02u_tx_complete_skb(struct mt76_dev *mdev, struct mt76_queue_entry *e)
19{
20	mt76x02u_remove_dma_hdr(e->skb);
21	mt76_tx_complete_skb(mdev, e->wcid, e->skb);
22}
23EXPORT_SYMBOL_GPL(mt76x02u_tx_complete_skb);
24
25int mt76x02u_mac_start(struct mt76x02_dev *dev)
26{
27	mt76x02_mac_reset_counters(dev);
28
29	mt76_wr(dev, MT_MAC_SYS_CTRL, MT_MAC_SYS_CTRL_ENABLE_TX);
30	if (!mt76x02_wait_for_wpdma(&dev->mt76, 200000))
31		return -ETIMEDOUT;
32
33	mt76_wr(dev, MT_RX_FILTR_CFG, dev->mt76.rxfilter);
34
35	mt76_wr(dev, MT_MAC_SYS_CTRL,
36		MT_MAC_SYS_CTRL_ENABLE_TX |
37		MT_MAC_SYS_CTRL_ENABLE_RX);
38
39	if (!mt76x02_wait_for_wpdma(&dev->mt76, 50))
40		return -ETIMEDOUT;
41
42	return 0;
43}
44EXPORT_SYMBOL_GPL(mt76x02u_mac_start);
45
46int mt76x02u_skb_dma_info(struct sk_buff *skb, int port, u32 flags)
47{
48	u32 info, pad;
49
50	/* Buffer layout:
51	 *	|   4B   | xfer len |      pad       |  4B  |
52	 *	| TXINFO | pkt/cmd  | zero pad to 4B | zero |
53	 *
54	 * length field of TXINFO should be set to 'xfer len'.
55	 */
56	info = FIELD_PREP(MT_TXD_INFO_LEN, round_up(skb->len, 4)) |
57	       FIELD_PREP(MT_TXD_INFO_DPORT, port) | flags;
58	put_unaligned_le32(info, skb_push(skb, sizeof(info)));
59
60	pad = round_up(skb->len, 4) + 4 - skb->len;
61	return mt76_skb_adjust_pad(skb, pad);
62}
63
64int mt76x02u_tx_prepare_skb(struct mt76_dev *mdev, void *data,
65			    enum mt76_txq_id qid, struct mt76_wcid *wcid,
66			    struct ieee80211_sta *sta,
67			    struct mt76_tx_info *tx_info)
68{
69	struct mt76x02_dev *dev = container_of(mdev, struct mt76x02_dev, mt76);
70	int pid, len = tx_info->skb->len, ep = q2ep(dev->mphy.q_tx[qid]->hw_idx);
71	struct mt76x02_txwi *txwi;
72	bool ampdu = IEEE80211_SKB_CB(tx_info->skb)->flags & IEEE80211_TX_CTL_AMPDU;
73	enum mt76_qsel qsel;
74	u32 flags;
75	int err;
76
77	mt76_insert_hdr_pad(tx_info->skb);
78
79	txwi = (struct mt76x02_txwi *)(tx_info->skb->data - sizeof(*txwi));
80	mt76x02_mac_write_txwi(dev, txwi, tx_info->skb, wcid, sta, len);
81	skb_push(tx_info->skb, sizeof(*txwi));
82
83	pid = mt76_tx_status_skb_add(mdev, wcid, tx_info->skb);
84
85	/* encode packet rate for no-skb packet id to fix up status reporting */
86	if (pid == MT_PACKET_ID_NO_SKB)
87		pid = MT_PACKET_ID_HAS_RATE |
88		      (le16_to_cpu(txwi->rate) & MT_PKTID_RATE) |
89		      FIELD_PREP(MT_PKTID_AC,
90				 skb_get_queue_mapping(tx_info->skb));
91
92	txwi->pktid = pid;
93
94	if ((mt76_is_skb_pktid(pid) && ampdu) || ep == MT_EP_OUT_HCCA)
95		qsel = MT_QSEL_MGMT;
96	else
97		qsel = MT_QSEL_EDCA;
98
99	flags = FIELD_PREP(MT_TXD_INFO_QSEL, qsel) |
100		MT_TXD_INFO_80211;
101	if (!wcid || wcid->hw_key_idx == 0xff || wcid->sw_iv)
102		flags |= MT_TXD_INFO_WIV;
103
104	if (sta) {
105		struct mt76x02_sta *msta = (struct mt76x02_sta *)sta->drv_priv;
106
107		ewma_pktlen_add(&msta->pktlen, tx_info->skb->len);
108	}
109
110	err = mt76x02u_skb_dma_info(tx_info->skb, WLAN_PORT, flags);
111	if (err && wcid)
112		/* Release pktid in case of error. */
113		idr_remove(&wcid->pktid, pid);
114
115	return err;
116}
117EXPORT_SYMBOL_GPL(mt76x02u_tx_prepare_skb);
118
119/* Trigger pre-TBTT event 8 ms before TBTT */
120#define PRE_TBTT_USEC 8000
121
122/* Beacon SRAM memory is limited to 8kB. We need to send PS buffered frames
123 * (which can be 1500 bytes big) via beacon memory. That make limit of number
124 * of slots to 5. TODO: dynamically calculate offsets in beacon SRAM.
125 */
126#define N_BCN_SLOTS 5
127
128static void mt76x02u_start_pre_tbtt_timer(struct mt76x02_dev *dev)
129{
130	u64 time;
131	u32 tbtt;
132
133	/* Get remaining TBTT in usec */
134	tbtt = mt76_get_field(dev, MT_TBTT_TIMER, MT_TBTT_TIMER_VAL);
135	tbtt *= 32;
136
137	if (tbtt <= PRE_TBTT_USEC) {
138		queue_work(system_highpri_wq, &dev->pre_tbtt_work);
139		return;
140	}
141
142	time = (tbtt - PRE_TBTT_USEC) * 1000ull;
143	hrtimer_start(&dev->pre_tbtt_timer, time, HRTIMER_MODE_REL);
144}
145
146static void mt76x02u_restart_pre_tbtt_timer(struct mt76x02_dev *dev)
147{
148	u32 tbtt, dw0, dw1;
149	u64 tsf, time;
150
151	/* Get remaining TBTT in usec */
152	tbtt = mt76_get_field(dev, MT_TBTT_TIMER, MT_TBTT_TIMER_VAL);
153	tbtt *= 32;
154
155	dw0 = mt76_rr(dev, MT_TSF_TIMER_DW0);
156	dw1 = mt76_rr(dev, MT_TSF_TIMER_DW1);
157	tsf = (u64)dw0 << 32 | dw1;
158	dev_dbg(dev->mt76.dev, "TSF: %llu us TBTT %u us\n", tsf, tbtt);
159
160	/* Convert beacon interval in TU (1024 usec) to nsec */
161	time = ((1000000000ull * dev->mt76.beacon_int) >> 10);
162
163	/* Adjust time to trigger hrtimer 8ms before TBTT */
164	if (tbtt < PRE_TBTT_USEC)
165		time -= (PRE_TBTT_USEC - tbtt) * 1000ull;
166	else
167		time += (tbtt - PRE_TBTT_USEC) * 1000ull;
168
169	hrtimer_start(&dev->pre_tbtt_timer, time, HRTIMER_MODE_REL);
170}
171
172static void mt76x02u_stop_pre_tbtt_timer(struct mt76x02_dev *dev)
173{
174	do {
175		hrtimer_cancel(&dev->pre_tbtt_timer);
176		cancel_work_sync(&dev->pre_tbtt_work);
177		/* Timer can be rearmed by work. */
178	} while (hrtimer_active(&dev->pre_tbtt_timer));
179}
180
181static void mt76x02u_pre_tbtt_work(struct work_struct *work)
182{
183	struct mt76x02_dev *dev =
184		container_of(work, struct mt76x02_dev, pre_tbtt_work);
185	struct beacon_bc_data data = {};
186	struct sk_buff *skb;
187	int nbeacons;
188
189	if (!dev->mt76.beacon_mask)
190		return;
191
192	if (mt76_hw(dev)->conf.flags & IEEE80211_CONF_OFFCHANNEL)
193		return;
194
195	mt76x02_resync_beacon_timer(dev);
196
197	/* Prevent corrupt transmissions during update */
198	mt76_set(dev, MT_BCN_BYPASS_MASK, 0xffff);
199	dev->beacon_data_count = 0;
200
201	ieee80211_iterate_active_interfaces(mt76_hw(dev),
202		IEEE80211_IFACE_ITER_RESUME_ALL,
203		mt76x02_update_beacon_iter, dev);
204
205	mt76_csa_check(&dev->mt76);
206
207	if (dev->mt76.csa_complete) {
208		mt76_csa_finish(&dev->mt76);
209		goto out;
210	}
211
212	nbeacons = hweight8(dev->mt76.beacon_mask);
213	mt76x02_enqueue_buffered_bc(dev, &data, N_BCN_SLOTS - nbeacons);
214
215	while ((skb = __skb_dequeue(&data.q)) != NULL)
216		mt76x02_mac_set_beacon(dev, skb);
217
218out:
219	mt76_wr(dev, MT_BCN_BYPASS_MASK,
220		0xff00 | ~(0xff00 >> dev->beacon_data_count));
221
222	mt76x02u_restart_pre_tbtt_timer(dev);
223}
224
225static enum hrtimer_restart mt76x02u_pre_tbtt_interrupt(struct hrtimer *timer)
226{
227	struct mt76x02_dev *dev =
228	    container_of(timer, struct mt76x02_dev, pre_tbtt_timer);
229
230	queue_work(system_highpri_wq, &dev->pre_tbtt_work);
231
232	return HRTIMER_NORESTART;
233}
234
235static void mt76x02u_pre_tbtt_enable(struct mt76x02_dev *dev, bool en)
236{
237	if (en && dev->mt76.beacon_mask &&
238	    !hrtimer_active(&dev->pre_tbtt_timer))
239		mt76x02u_start_pre_tbtt_timer(dev);
240	if (!en)
241		mt76x02u_stop_pre_tbtt_timer(dev);
242}
243
244static void mt76x02u_beacon_enable(struct mt76x02_dev *dev, bool en)
245{
246	if (WARN_ON_ONCE(!dev->mt76.beacon_int))
247		return;
248
249	if (en)
250		mt76x02u_start_pre_tbtt_timer(dev);
251}
252
253void mt76x02u_init_beacon_config(struct mt76x02_dev *dev)
254{
255	static const struct mt76x02_beacon_ops beacon_ops = {
256		.nslots = N_BCN_SLOTS,
257		.slot_size = (8192 / N_BCN_SLOTS) & ~63,
258		.pre_tbtt_enable = mt76x02u_pre_tbtt_enable,
259		.beacon_enable = mt76x02u_beacon_enable,
260	};
261	dev->beacon_ops = &beacon_ops;
262
263	hrtimer_init(&dev->pre_tbtt_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
264	dev->pre_tbtt_timer.function = mt76x02u_pre_tbtt_interrupt;
265	INIT_WORK(&dev->pre_tbtt_work, mt76x02u_pre_tbtt_work);
266
267	mt76x02_init_beacon_config(dev);
268}
269EXPORT_SYMBOL_GPL(mt76x02u_init_beacon_config);
270
271void mt76x02u_exit_beacon_config(struct mt76x02_dev *dev)
272{
273	if (!test_bit(MT76_REMOVED, &dev->mphy.state))
274		mt76_clear(dev, MT_BEACON_TIME_CFG,
275			   MT_BEACON_TIME_CFG_TIMER_EN |
276			   MT_BEACON_TIME_CFG_SYNC_MODE |
277			   MT_BEACON_TIME_CFG_TBTT_EN |
278			   MT_BEACON_TIME_CFG_BEACON_TX);
279
280	mt76x02u_stop_pre_tbtt_timer(dev);
281}
282EXPORT_SYMBOL_GPL(mt76x02u_exit_beacon_config);
283