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1// SPDX-License-Identifier: ISC
2/*
3 * Copyright (C) 2018 Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>
4 */
5
6#include <linux/module.h>
7#include "mt76.h"
8#include "usb_trace.h"
9#include "dma.h"
10
11#define MT_VEND_REQ_MAX_RETRY 10
12#define MT_VEND_REQ_TOUT_MS 300
13
14static bool disable_usb_sg;
15module_param_named(disable_usb_sg, disable_usb_sg, bool, 0644);
16MODULE_PARM_DESC(disable_usb_sg, "Disable usb scatter-gather support");
17
18int __mt76u_vendor_request(struct mt76_dev *dev, u8 req, u8 req_type,
19 u16 val, u16 offset, void *buf, size_t len)
20{
21 struct usb_interface *uintf = to_usb_interface(dev->dev);
22 struct usb_device *udev = interface_to_usbdev(uintf);
23 unsigned int pipe;
24 int i, ret;
25
26 lockdep_assert_held(&dev->usb.usb_ctrl_mtx);
27
28 pipe = (req_type & USB_DIR_IN) ? usb_rcvctrlpipe(udev, 0)
29 : usb_sndctrlpipe(udev, 0);
30 for (i = 0; i < MT_VEND_REQ_MAX_RETRY; i++) {
31 if (test_bit(MT76_REMOVED, &dev->phy.state))
32 return -EIO;
33
34 ret = usb_control_msg(udev, pipe, req, req_type, val,
35 offset, buf, len, MT_VEND_REQ_TOUT_MS);
36 if (ret == -ENODEV)
37 set_bit(MT76_REMOVED, &dev->phy.state);
38 if (ret >= 0 || ret == -ENODEV)
39 return ret;
40 usleep_range(5000, 10000);
41 }
42
43 dev_err(dev->dev, "vendor request req:%02x off:%04x failed:%d\n",
44 req, offset, ret);
45 return ret;
46}
47EXPORT_SYMBOL_GPL(__mt76u_vendor_request);
48
49int mt76u_vendor_request(struct mt76_dev *dev, u8 req,
50 u8 req_type, u16 val, u16 offset,
51 void *buf, size_t len)
52{
53 int ret;
54
55 mutex_lock(&dev->usb.usb_ctrl_mtx);
56 ret = __mt76u_vendor_request(dev, req, req_type,
57 val, offset, buf, len);
58 trace_usb_reg_wr(dev, offset, val);
59 mutex_unlock(&dev->usb.usb_ctrl_mtx);
60
61 return ret;
62}
63EXPORT_SYMBOL_GPL(mt76u_vendor_request);
64
65u32 ___mt76u_rr(struct mt76_dev *dev, u8 req, u8 req_type, u32 addr)
66{
67 struct mt76_usb *usb = &dev->usb;
68 u32 data = ~0;
69 int ret;
70
71 ret = __mt76u_vendor_request(dev, req, req_type, addr >> 16,
72 addr, usb->data, sizeof(__le32));
73 if (ret == sizeof(__le32))
74 data = get_unaligned_le32(usb->data);
75 trace_usb_reg_rr(dev, addr, data);
76
77 return data;
78}
79EXPORT_SYMBOL_GPL(___mt76u_rr);
80
81static u32 __mt76u_rr(struct mt76_dev *dev, u32 addr)
82{
83 u8 req;
84
85 switch (addr & MT_VEND_TYPE_MASK) {
86 case MT_VEND_TYPE_EEPROM:
87 req = MT_VEND_READ_EEPROM;
88 break;
89 case MT_VEND_TYPE_CFG:
90 req = MT_VEND_READ_CFG;
91 break;
92 default:
93 req = MT_VEND_MULTI_READ;
94 break;
95 }
96
97 return ___mt76u_rr(dev, req, USB_DIR_IN | USB_TYPE_VENDOR,
98 addr & ~MT_VEND_TYPE_MASK);
99}
100
101static u32 mt76u_rr(struct mt76_dev *dev, u32 addr)
102{
103 u32 ret;
104
105 mutex_lock(&dev->usb.usb_ctrl_mtx);
106 ret = __mt76u_rr(dev, addr);
107 mutex_unlock(&dev->usb.usb_ctrl_mtx);
108
109 return ret;
110}
111
112void ___mt76u_wr(struct mt76_dev *dev, u8 req, u8 req_type,
113 u32 addr, u32 val)
114{
115 struct mt76_usb *usb = &dev->usb;
116
117 put_unaligned_le32(val, usb->data);
118 __mt76u_vendor_request(dev, req, req_type, addr >> 16,
119 addr, usb->data, sizeof(__le32));
120 trace_usb_reg_wr(dev, addr, val);
121}
122EXPORT_SYMBOL_GPL(___mt76u_wr);
123
124static void __mt76u_wr(struct mt76_dev *dev, u32 addr, u32 val)
125{
126 u8 req;
127
128 switch (addr & MT_VEND_TYPE_MASK) {
129 case MT_VEND_TYPE_CFG:
130 req = MT_VEND_WRITE_CFG;
131 break;
132 default:
133 req = MT_VEND_MULTI_WRITE;
134 break;
135 }
136 ___mt76u_wr(dev, req, USB_DIR_OUT | USB_TYPE_VENDOR,
137 addr & ~MT_VEND_TYPE_MASK, val);
138}
139
140static void mt76u_wr(struct mt76_dev *dev, u32 addr, u32 val)
141{
142 mutex_lock(&dev->usb.usb_ctrl_mtx);
143 __mt76u_wr(dev, addr, val);
144 mutex_unlock(&dev->usb.usb_ctrl_mtx);
145}
146
147static u32 mt76u_rmw(struct mt76_dev *dev, u32 addr,
148 u32 mask, u32 val)
149{
150 mutex_lock(&dev->usb.usb_ctrl_mtx);
151 val |= __mt76u_rr(dev, addr) & ~mask;
152 __mt76u_wr(dev, addr, val);
153 mutex_unlock(&dev->usb.usb_ctrl_mtx);
154
155 return val;
156}
157
158static void mt76u_copy(struct mt76_dev *dev, u32 offset,
159 const void *data, int len)
160{
161 struct mt76_usb *usb = &dev->usb;
162 const u8 *val = data;
163 int ret;
164 int current_batch_size;
165 int i = 0;
166
167 /* Assure that always a multiple of 4 bytes are copied,
168 * otherwise beacons can be corrupted.
169 * See: "mt76: round up length on mt76_wr_copy"
170 * Commit 850e8f6fbd5d0003b0
171 */
172 len = round_up(len, 4);
173
174 mutex_lock(&usb->usb_ctrl_mtx);
175 while (i < len) {
176 current_batch_size = min_t(int, usb->data_len, len - i);
177 memcpy(usb->data, val + i, current_batch_size);
178 ret = __mt76u_vendor_request(dev, MT_VEND_MULTI_WRITE,
179 USB_DIR_OUT | USB_TYPE_VENDOR,
180 0, offset + i, usb->data,
181 current_batch_size);
182 if (ret < 0)
183 break;
184
185 i += current_batch_size;
186 }
187 mutex_unlock(&usb->usb_ctrl_mtx);
188}
189
190void mt76u_read_copy(struct mt76_dev *dev, u32 offset,
191 void *data, int len)
192{
193 struct mt76_usb *usb = &dev->usb;
194 int i = 0, batch_len, ret;
195 u8 *val = data;
196
197 len = round_up(len, 4);
198 mutex_lock(&usb->usb_ctrl_mtx);
199 while (i < len) {
200 batch_len = min_t(int, usb->data_len, len - i);
201 ret = __mt76u_vendor_request(dev, MT_VEND_READ_EXT,
202 USB_DIR_IN | USB_TYPE_VENDOR,
203 (offset + i) >> 16, offset + i,
204 usb->data, batch_len);
205 if (ret < 0)
206 break;
207
208 memcpy(val + i, usb->data, batch_len);
209 i += batch_len;
210 }
211 mutex_unlock(&usb->usb_ctrl_mtx);
212}
213EXPORT_SYMBOL_GPL(mt76u_read_copy);
214
215void mt76u_single_wr(struct mt76_dev *dev, const u8 req,
216 const u16 offset, const u32 val)
217{
218 mutex_lock(&dev->usb.usb_ctrl_mtx);
219 __mt76u_vendor_request(dev, req,
220 USB_DIR_OUT | USB_TYPE_VENDOR,
221 val & 0xffff, offset, NULL, 0);
222 __mt76u_vendor_request(dev, req,
223 USB_DIR_OUT | USB_TYPE_VENDOR,
224 val >> 16, offset + 2, NULL, 0);
225 mutex_unlock(&dev->usb.usb_ctrl_mtx);
226}
227EXPORT_SYMBOL_GPL(mt76u_single_wr);
228
229static int
230mt76u_req_wr_rp(struct mt76_dev *dev, u32 base,
231 const struct mt76_reg_pair *data, int len)
232{
233 struct mt76_usb *usb = &dev->usb;
234
235 mutex_lock(&usb->usb_ctrl_mtx);
236 while (len > 0) {
237 __mt76u_wr(dev, base + data->reg, data->value);
238 len--;
239 data++;
240 }
241 mutex_unlock(&usb->usb_ctrl_mtx);
242
243 return 0;
244}
245
246static int
247mt76u_wr_rp(struct mt76_dev *dev, u32 base,
248 const struct mt76_reg_pair *data, int n)
249{
250 if (test_bit(MT76_STATE_MCU_RUNNING, &dev->phy.state))
251 return dev->mcu_ops->mcu_wr_rp(dev, base, data, n);
252 else
253 return mt76u_req_wr_rp(dev, base, data, n);
254}
255
256static int
257mt76u_req_rd_rp(struct mt76_dev *dev, u32 base, struct mt76_reg_pair *data,
258 int len)
259{
260 struct mt76_usb *usb = &dev->usb;
261
262 mutex_lock(&usb->usb_ctrl_mtx);
263 while (len > 0) {
264 data->value = __mt76u_rr(dev, base + data->reg);
265 len--;
266 data++;
267 }
268 mutex_unlock(&usb->usb_ctrl_mtx);
269
270 return 0;
271}
272
273static int
274mt76u_rd_rp(struct mt76_dev *dev, u32 base,
275 struct mt76_reg_pair *data, int n)
276{
277 if (test_bit(MT76_STATE_MCU_RUNNING, &dev->phy.state))
278 return dev->mcu_ops->mcu_rd_rp(dev, base, data, n);
279 else
280 return mt76u_req_rd_rp(dev, base, data, n);
281}
282
283static bool mt76u_check_sg(struct mt76_dev *dev)
284{
285 struct usb_interface *uintf = to_usb_interface(dev->dev);
286 struct usb_device *udev = interface_to_usbdev(uintf);
287
288 return (!disable_usb_sg && udev->bus->sg_tablesize > 0 &&
289 udev->bus->no_sg_constraint);
290}
291
292static int
293mt76u_set_endpoints(struct usb_interface *intf,
294 struct mt76_usb *usb)
295{
296 struct usb_host_interface *intf_desc = intf->cur_altsetting;
297 struct usb_endpoint_descriptor *ep_desc;
298 int i, in_ep = 0, out_ep = 0;
299
300 for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) {
301 ep_desc = &intf_desc->endpoint[i].desc;
302
303 if (usb_endpoint_is_bulk_in(ep_desc) &&
304 in_ep < __MT_EP_IN_MAX) {
305 usb->in_ep[in_ep] = usb_endpoint_num(ep_desc);
306 in_ep++;
307 } else if (usb_endpoint_is_bulk_out(ep_desc) &&
308 out_ep < __MT_EP_OUT_MAX) {
309 usb->out_ep[out_ep] = usb_endpoint_num(ep_desc);
310 out_ep++;
311 }
312 }
313
314 if (in_ep != __MT_EP_IN_MAX || out_ep != __MT_EP_OUT_MAX)
315 return -EINVAL;
316 return 0;
317}
318
319static int
320mt76u_fill_rx_sg(struct mt76_dev *dev, struct mt76_queue *q, struct urb *urb,
321 int nsgs)
322{
323 int i;
324
325 for (i = 0; i < nsgs; i++) {
326 void *data;
327 int offset;
328
329 data = mt76_get_page_pool_buf(q, &offset, q->buf_size);
330 if (!data)
331 break;
332
333 sg_set_page(&urb->sg[i], virt_to_head_page(data), q->buf_size,
334 offset);
335 }
336
337 if (i < nsgs) {
338 int j;
339
340 for (j = nsgs; j < urb->num_sgs; j++)
341 mt76_put_page_pool_buf(sg_virt(&urb->sg[j]), false);
342 urb->num_sgs = i;
343 }
344
345 urb->num_sgs = max_t(int, i, urb->num_sgs);
346 urb->transfer_buffer_length = urb->num_sgs * q->buf_size;
347 sg_init_marker(urb->sg, urb->num_sgs);
348
349 return i ? : -ENOMEM;
350}
351
352static int
353mt76u_refill_rx(struct mt76_dev *dev, struct mt76_queue *q,
354 struct urb *urb, int nsgs)
355{
356 enum mt76_rxq_id qid = q - &dev->q_rx[MT_RXQ_MAIN];
357 int offset;
358
359 if (qid == MT_RXQ_MAIN && dev->usb.sg_en)
360 return mt76u_fill_rx_sg(dev, q, urb, nsgs);
361
362 urb->transfer_buffer_length = q->buf_size;
363 urb->transfer_buffer = mt76_get_page_pool_buf(q, &offset, q->buf_size);
364
365 return urb->transfer_buffer ? 0 : -ENOMEM;
366}
367
368static int
369mt76u_urb_alloc(struct mt76_dev *dev, struct mt76_queue_entry *e,
370 int sg_max_size)
371{
372 unsigned int size = sizeof(struct urb);
373
374 if (dev->usb.sg_en)
375 size += sg_max_size * sizeof(struct scatterlist);
376
377 e->urb = kzalloc(size, GFP_KERNEL);
378 if (!e->urb)
379 return -ENOMEM;
380
381 usb_init_urb(e->urb);
382
383 if (dev->usb.sg_en && sg_max_size > 0)
384 e->urb->sg = (struct scatterlist *)(e->urb + 1);
385
386 return 0;
387}
388
389static int
390mt76u_rx_urb_alloc(struct mt76_dev *dev, struct mt76_queue *q,
391 struct mt76_queue_entry *e)
392{
393 enum mt76_rxq_id qid = q - &dev->q_rx[MT_RXQ_MAIN];
394 int err, sg_size;
395
396 sg_size = qid == MT_RXQ_MAIN ? MT_RX_SG_MAX_SIZE : 0;
397 err = mt76u_urb_alloc(dev, e, sg_size);
398 if (err)
399 return err;
400
401 return mt76u_refill_rx(dev, q, e->urb, sg_size);
402}
403
404static void mt76u_urb_free(struct urb *urb)
405{
406 int i;
407
408 for (i = 0; i < urb->num_sgs; i++)
409 mt76_put_page_pool_buf(sg_virt(&urb->sg[i]), false);
410
411 if (urb->transfer_buffer)
412 mt76_put_page_pool_buf(urb->transfer_buffer, false);
413
414 usb_free_urb(urb);
415}
416
417static void
418mt76u_fill_bulk_urb(struct mt76_dev *dev, int dir, int index,
419 struct urb *urb, usb_complete_t complete_fn,
420 void *context)
421{
422 struct usb_interface *uintf = to_usb_interface(dev->dev);
423 struct usb_device *udev = interface_to_usbdev(uintf);
424 unsigned int pipe;
425
426 if (dir == USB_DIR_IN)
427 pipe = usb_rcvbulkpipe(udev, dev->usb.in_ep[index]);
428 else
429 pipe = usb_sndbulkpipe(udev, dev->usb.out_ep[index]);
430
431 urb->dev = udev;
432 urb->pipe = pipe;
433 urb->complete = complete_fn;
434 urb->context = context;
435}
436
437static struct urb *
438mt76u_get_next_rx_entry(struct mt76_queue *q)
439{
440 struct urb *urb = NULL;
441 unsigned long flags;
442
443 spin_lock_irqsave(&q->lock, flags);
444 if (q->queued > 0) {
445 urb = q->entry[q->tail].urb;
446 q->tail = (q->tail + 1) % q->ndesc;
447 q->queued--;
448 }
449 spin_unlock_irqrestore(&q->lock, flags);
450
451 return urb;
452}
453
454static int
455mt76u_get_rx_entry_len(struct mt76_dev *dev, u8 *data,
456 u32 data_len)
457{
458 u16 dma_len, min_len;
459
460 dma_len = get_unaligned_le16(data);
461 if (dev->drv->drv_flags & MT_DRV_RX_DMA_HDR)
462 return dma_len;
463
464 min_len = MT_DMA_HDR_LEN + MT_RX_RXWI_LEN + MT_FCE_INFO_LEN;
465 if (data_len < min_len || !dma_len ||
466 dma_len + MT_DMA_HDR_LEN > data_len ||
467 (dma_len & 0x3))
468 return -EINVAL;
469 return dma_len;
470}
471
472static struct sk_buff *
473mt76u_build_rx_skb(struct mt76_dev *dev, void *data,
474 int len, int buf_size)
475{
476 int head_room, drv_flags = dev->drv->drv_flags;
477 struct sk_buff *skb;
478
479 head_room = drv_flags & MT_DRV_RX_DMA_HDR ? 0 : MT_DMA_HDR_LEN;
480 if (SKB_WITH_OVERHEAD(buf_size) < head_room + len) {
481 struct page *page;
482
483 /* slow path, not enough space for data and
484 * skb_shared_info
485 */
486 skb = alloc_skb(MT_SKB_HEAD_LEN, GFP_ATOMIC);
487 if (!skb)
488 return NULL;
489
490 skb_put_data(skb, data + head_room, MT_SKB_HEAD_LEN);
491 data += head_room + MT_SKB_HEAD_LEN;
492 page = virt_to_head_page(data);
493 skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,
494 page, data - page_address(page),
495 len - MT_SKB_HEAD_LEN, buf_size);
496
497 return skb;
498 }
499
500 /* fast path */
501 skb = build_skb(data, buf_size);
502 if (!skb)
503 return NULL;
504
505 skb_reserve(skb, head_room);
506 __skb_put(skb, len);
507
508 return skb;
509}
510
511static int
512mt76u_process_rx_entry(struct mt76_dev *dev, struct urb *urb,
513 int buf_size)
514{
515 u8 *data = urb->num_sgs ? sg_virt(&urb->sg[0]) : urb->transfer_buffer;
516 int data_len = urb->num_sgs ? urb->sg[0].length : urb->actual_length;
517 int len, nsgs = 1, head_room, drv_flags = dev->drv->drv_flags;
518 struct sk_buff *skb;
519
520 if (!test_bit(MT76_STATE_INITIALIZED, &dev->phy.state))
521 return 0;
522
523 len = mt76u_get_rx_entry_len(dev, data, urb->actual_length);
524 if (len < 0)
525 return 0;
526
527 head_room = drv_flags & MT_DRV_RX_DMA_HDR ? 0 : MT_DMA_HDR_LEN;
528 data_len = min_t(int, len, data_len - head_room);
529
530 if (len == data_len &&
531 dev->drv->rx_check && !dev->drv->rx_check(dev, data, data_len))
532 return 0;
533
534 skb = mt76u_build_rx_skb(dev, data, data_len, buf_size);
535 if (!skb)
536 return 0;
537
538 len -= data_len;
539 while (len > 0 && nsgs < urb->num_sgs) {
540 data_len = min_t(int, len, urb->sg[nsgs].length);
541 skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,
542 sg_page(&urb->sg[nsgs]),
543 urb->sg[nsgs].offset, data_len,
544 buf_size);
545 len -= data_len;
546 nsgs++;
547 }
548
549 skb_mark_for_recycle(skb);
550 dev->drv->rx_skb(dev, MT_RXQ_MAIN, skb, NULL);
551
552 return nsgs;
553}
554
555static void mt76u_complete_rx(struct urb *urb)
556{
557 struct mt76_dev *dev = dev_get_drvdata(&urb->dev->dev);
558 struct mt76_queue *q = urb->context;
559 unsigned long flags;
560
561 trace_rx_urb(dev, urb);
562
563 switch (urb->status) {
564 case -ECONNRESET:
565 case -ESHUTDOWN:
566 case -ENOENT:
567 case -EPROTO:
568 return;
569 default:
570 dev_err_ratelimited(dev->dev, "rx urb failed: %d\n",
571 urb->status);
572 fallthrough;
573 case 0:
574 break;
575 }
576
577 spin_lock_irqsave(&q->lock, flags);
578 if (WARN_ONCE(q->entry[q->head].urb != urb, "rx urb mismatch"))
579 goto out;
580
581 q->head = (q->head + 1) % q->ndesc;
582 q->queued++;
583 mt76_worker_schedule(&dev->usb.rx_worker);
584out:
585 spin_unlock_irqrestore(&q->lock, flags);
586}
587
588static int
589mt76u_submit_rx_buf(struct mt76_dev *dev, enum mt76_rxq_id qid,
590 struct urb *urb)
591{
592 int ep = qid == MT_RXQ_MAIN ? MT_EP_IN_PKT_RX : MT_EP_IN_CMD_RESP;
593
594 mt76u_fill_bulk_urb(dev, USB_DIR_IN, ep, urb,
595 mt76u_complete_rx, &dev->q_rx[qid]);
596 trace_submit_urb(dev, urb);
597
598 return usb_submit_urb(urb, GFP_ATOMIC);
599}
600
601static void
602mt76u_process_rx_queue(struct mt76_dev *dev, struct mt76_queue *q)
603{
604 int qid = q - &dev->q_rx[MT_RXQ_MAIN];
605 struct urb *urb;
606 int err, count;
607
608 while (true) {
609 urb = mt76u_get_next_rx_entry(q);
610 if (!urb)
611 break;
612
613 count = mt76u_process_rx_entry(dev, urb, q->buf_size);
614 if (count > 0) {
615 err = mt76u_refill_rx(dev, q, urb, count);
616 if (err < 0)
617 break;
618 }
619 mt76u_submit_rx_buf(dev, qid, urb);
620 }
621 if (qid == MT_RXQ_MAIN) {
622 local_bh_disable();
623 mt76_rx_poll_complete(dev, MT_RXQ_MAIN, NULL);
624 local_bh_enable();
625 }
626}
627
628static void mt76u_rx_worker(struct mt76_worker *w)
629{
630 struct mt76_usb *usb = container_of(w, struct mt76_usb, rx_worker);
631 struct mt76_dev *dev = container_of(usb, struct mt76_dev, usb);
632 int i;
633
634 rcu_read_lock();
635 mt76_for_each_q_rx(dev, i)
636 mt76u_process_rx_queue(dev, &dev->q_rx[i]);
637 rcu_read_unlock();
638}
639
640static int
641mt76u_submit_rx_buffers(struct mt76_dev *dev, enum mt76_rxq_id qid)
642{
643 struct mt76_queue *q = &dev->q_rx[qid];
644 unsigned long flags;
645 int i, err = 0;
646
647 spin_lock_irqsave(&q->lock, flags);
648 for (i = 0; i < q->ndesc; i++) {
649 err = mt76u_submit_rx_buf(dev, qid, q->entry[i].urb);
650 if (err < 0)
651 break;
652 }
653 q->head = q->tail = 0;
654 q->queued = 0;
655 spin_unlock_irqrestore(&q->lock, flags);
656
657 return err;
658}
659
660static int
661mt76u_alloc_rx_queue(struct mt76_dev *dev, enum mt76_rxq_id qid)
662{
663 struct mt76_queue *q = &dev->q_rx[qid];
664 int i, err;
665
666 err = mt76_create_page_pool(dev, q);
667 if (err)
668 return err;
669
670 spin_lock_init(&q->lock);
671 q->entry = devm_kcalloc(dev->dev,
672 MT_NUM_RX_ENTRIES, sizeof(*q->entry),
673 GFP_KERNEL);
674 if (!q->entry)
675 return -ENOMEM;
676
677 q->ndesc = MT_NUM_RX_ENTRIES;
678 q->buf_size = PAGE_SIZE;
679
680 for (i = 0; i < q->ndesc; i++) {
681 err = mt76u_rx_urb_alloc(dev, q, &q->entry[i]);
682 if (err < 0)
683 return err;
684 }
685
686 return mt76u_submit_rx_buffers(dev, qid);
687}
688
689int mt76u_alloc_mcu_queue(struct mt76_dev *dev)
690{
691 return mt76u_alloc_rx_queue(dev, MT_RXQ_MCU);
692}
693EXPORT_SYMBOL_GPL(mt76u_alloc_mcu_queue);
694
695static void
696mt76u_free_rx_queue(struct mt76_dev *dev, struct mt76_queue *q)
697{
698 int i;
699
700 for (i = 0; i < q->ndesc; i++) {
701 if (!q->entry[i].urb)
702 continue;
703
704 mt76u_urb_free(q->entry[i].urb);
705 q->entry[i].urb = NULL;
706 }
707 page_pool_destroy(q->page_pool);
708 q->page_pool = NULL;
709}
710
711static void mt76u_free_rx(struct mt76_dev *dev)
712{
713 int i;
714
715 mt76_worker_teardown(&dev->usb.rx_worker);
716
717 mt76_for_each_q_rx(dev, i)
718 mt76u_free_rx_queue(dev, &dev->q_rx[i]);
719}
720
721void mt76u_stop_rx(struct mt76_dev *dev)
722{
723 int i;
724
725 mt76_worker_disable(&dev->usb.rx_worker);
726
727 mt76_for_each_q_rx(dev, i) {
728 struct mt76_queue *q = &dev->q_rx[i];
729 int j;
730
731 for (j = 0; j < q->ndesc; j++)
732 usb_poison_urb(q->entry[j].urb);
733 }
734}
735EXPORT_SYMBOL_GPL(mt76u_stop_rx);
736
737int mt76u_resume_rx(struct mt76_dev *dev)
738{
739 int i;
740
741 mt76_for_each_q_rx(dev, i) {
742 struct mt76_queue *q = &dev->q_rx[i];
743 int err, j;
744
745 for (j = 0; j < q->ndesc; j++)
746 usb_unpoison_urb(q->entry[j].urb);
747
748 err = mt76u_submit_rx_buffers(dev, i);
749 if (err < 0)
750 return err;
751 }
752
753 mt76_worker_enable(&dev->usb.rx_worker);
754
755 return 0;
756}
757EXPORT_SYMBOL_GPL(mt76u_resume_rx);
758
759static void mt76u_status_worker(struct mt76_worker *w)
760{
761 struct mt76_usb *usb = container_of(w, struct mt76_usb, status_worker);
762 struct mt76_dev *dev = container_of(usb, struct mt76_dev, usb);
763 struct mt76_queue_entry entry;
764 struct mt76_queue *q;
765 int i;
766
767 if (!test_bit(MT76_STATE_RUNNING, &dev->phy.state))
768 return;
769
770 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
771 q = dev->phy.q_tx[i];
772 if (!q)
773 continue;
774
775 while (q->queued > 0) {
776 if (!q->entry[q->tail].done)
777 break;
778
779 entry = q->entry[q->tail];
780 q->entry[q->tail].done = false;
781
782 mt76_queue_tx_complete(dev, q, &entry);
783 }
784
785 if (!q->queued)
786 wake_up(&dev->tx_wait);
787
788 mt76_worker_schedule(&dev->tx_worker);
789 }
790
791 if (dev->drv->tx_status_data &&
792 !test_and_set_bit(MT76_READING_STATS, &dev->phy.state))
793 queue_work(dev->wq, &dev->usb.stat_work);
794}
795
796static void mt76u_tx_status_data(struct work_struct *work)
797{
798 struct mt76_usb *usb;
799 struct mt76_dev *dev;
800 u8 update = 1;
801 u16 count = 0;
802
803 usb = container_of(work, struct mt76_usb, stat_work);
804 dev = container_of(usb, struct mt76_dev, usb);
805
806 while (true) {
807 if (test_bit(MT76_REMOVED, &dev->phy.state))
808 break;
809
810 if (!dev->drv->tx_status_data(dev, &update))
811 break;
812 count++;
813 }
814
815 if (count && test_bit(MT76_STATE_RUNNING, &dev->phy.state))
816 queue_work(dev->wq, &usb->stat_work);
817 else
818 clear_bit(MT76_READING_STATS, &dev->phy.state);
819}
820
821static void mt76u_complete_tx(struct urb *urb)
822{
823 struct mt76_dev *dev = dev_get_drvdata(&urb->dev->dev);
824 struct mt76_queue_entry *e = urb->context;
825
826 if (mt76u_urb_error(urb))
827 dev_err(dev->dev, "tx urb failed: %d\n", urb->status);
828 e->done = true;
829
830 mt76_worker_schedule(&dev->usb.status_worker);
831}
832
833static int
834mt76u_tx_setup_buffers(struct mt76_dev *dev, struct sk_buff *skb,
835 struct urb *urb)
836{
837 urb->transfer_buffer_length = skb->len;
838
839 if (!dev->usb.sg_en) {
840 urb->transfer_buffer = skb->data;
841 return 0;
842 }
843
844 sg_init_table(urb->sg, MT_TX_SG_MAX_SIZE);
845 urb->num_sgs = skb_to_sgvec(skb, urb->sg, 0, skb->len);
846 if (!urb->num_sgs)
847 return -ENOMEM;
848
849 return urb->num_sgs;
850}
851
852static int
853mt76u_tx_queue_skb(struct mt76_dev *dev, struct mt76_queue *q,
854 enum mt76_txq_id qid, struct sk_buff *skb,
855 struct mt76_wcid *wcid, struct ieee80211_sta *sta)
856{
857 struct mt76_tx_info tx_info = {
858 .skb = skb,
859 };
860 u16 idx = q->head;
861 int err;
862
863 if (q->queued == q->ndesc)
864 return -ENOSPC;
865
866 skb->prev = skb->next = NULL;
867 err = dev->drv->tx_prepare_skb(dev, NULL, qid, wcid, sta, &tx_info);
868 if (err < 0)
869 return err;
870
871 err = mt76u_tx_setup_buffers(dev, tx_info.skb, q->entry[idx].urb);
872 if (err < 0)
873 return err;
874
875 mt76u_fill_bulk_urb(dev, USB_DIR_OUT, q2ep(q->hw_idx),
876 q->entry[idx].urb, mt76u_complete_tx,
877 &q->entry[idx]);
878
879 q->head = (q->head + 1) % q->ndesc;
880 q->entry[idx].skb = tx_info.skb;
881 q->entry[idx].wcid = 0xffff;
882 q->queued++;
883
884 return idx;
885}
886
887static void mt76u_tx_kick(struct mt76_dev *dev, struct mt76_queue *q)
888{
889 struct urb *urb;
890 int err;
891
892 while (q->first != q->head) {
893 urb = q->entry[q->first].urb;
894
895 trace_submit_urb(dev, urb);
896 err = usb_submit_urb(urb, GFP_ATOMIC);
897 if (err < 0) {
898 if (err == -ENODEV)
899 set_bit(MT76_REMOVED, &dev->phy.state);
900 else
901 dev_err(dev->dev, "tx urb submit failed:%d\n",
902 err);
903 break;
904 }
905 q->first = (q->first + 1) % q->ndesc;
906 }
907}
908
909static u8 mt76u_ac_to_hwq(struct mt76_dev *dev, u8 ac)
910{
911 if (mt76_chip(dev) == 0x7663) {
912 static const u8 lmac_queue_map[] = {
913 /* ac to lmac mapping */
914 [IEEE80211_AC_BK] = 0,
915 [IEEE80211_AC_BE] = 1,
916 [IEEE80211_AC_VI] = 2,
917 [IEEE80211_AC_VO] = 4,
918 };
919
920 if (WARN_ON(ac >= ARRAY_SIZE(lmac_queue_map)))
921 return 1; /* BE */
922
923 return lmac_queue_map[ac];
924 }
925
926 return mt76_ac_to_hwq(ac);
927}
928
929static int mt76u_alloc_tx(struct mt76_dev *dev)
930{
931 struct mt76_queue *q;
932 int i, j, err;
933
934 for (i = 0; i <= MT_TXQ_PSD; i++) {
935 if (i >= IEEE80211_NUM_ACS) {
936 dev->phy.q_tx[i] = dev->phy.q_tx[0];
937 continue;
938 }
939
940 q = devm_kzalloc(dev->dev, sizeof(*q), GFP_KERNEL);
941 if (!q)
942 return -ENOMEM;
943
944 spin_lock_init(&q->lock);
945 q->hw_idx = mt76u_ac_to_hwq(dev, i);
946
947 dev->phy.q_tx[i] = q;
948
949 q->entry = devm_kcalloc(dev->dev,
950 MT_NUM_TX_ENTRIES, sizeof(*q->entry),
951 GFP_KERNEL);
952 if (!q->entry)
953 return -ENOMEM;
954
955 q->ndesc = MT_NUM_TX_ENTRIES;
956 for (j = 0; j < q->ndesc; j++) {
957 err = mt76u_urb_alloc(dev, &q->entry[j],
958 MT_TX_SG_MAX_SIZE);
959 if (err < 0)
960 return err;
961 }
962 }
963 return 0;
964}
965
966static void mt76u_free_tx(struct mt76_dev *dev)
967{
968 int i;
969
970 mt76_worker_teardown(&dev->usb.status_worker);
971
972 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
973 struct mt76_queue *q;
974 int j;
975
976 q = dev->phy.q_tx[i];
977 if (!q)
978 continue;
979
980 for (j = 0; j < q->ndesc; j++) {
981 usb_free_urb(q->entry[j].urb);
982 q->entry[j].urb = NULL;
983 }
984 }
985}
986
987void mt76u_stop_tx(struct mt76_dev *dev)
988{
989 int ret;
990
991 mt76_worker_disable(&dev->usb.status_worker);
992
993 ret = wait_event_timeout(dev->tx_wait, !mt76_has_tx_pending(&dev->phy),
994 HZ / 5);
995 if (!ret) {
996 struct mt76_queue_entry entry;
997 struct mt76_queue *q;
998 int i, j;
999
1000 dev_err(dev->dev, "timed out waiting for pending tx\n");
1001
1002 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
1003 q = dev->phy.q_tx[i];
1004 if (!q)
1005 continue;
1006
1007 for (j = 0; j < q->ndesc; j++)
1008 usb_kill_urb(q->entry[j].urb);
1009 }
1010
1011 mt76_worker_disable(&dev->tx_worker);
1012
1013 /* On device removal we maight queue skb's, but mt76u_tx_kick()
1014 * will fail to submit urb, cleanup those skb's manually.
1015 */
1016 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
1017 q = dev->phy.q_tx[i];
1018 if (!q)
1019 continue;
1020
1021 while (q->queued > 0) {
1022 entry = q->entry[q->tail];
1023 q->entry[q->tail].done = false;
1024 mt76_queue_tx_complete(dev, q, &entry);
1025 }
1026 }
1027
1028 mt76_worker_enable(&dev->tx_worker);
1029 }
1030
1031 cancel_work_sync(&dev->usb.stat_work);
1032 clear_bit(MT76_READING_STATS, &dev->phy.state);
1033
1034 mt76_worker_enable(&dev->usb.status_worker);
1035
1036 mt76_tx_status_check(dev, true);
1037}
1038EXPORT_SYMBOL_GPL(mt76u_stop_tx);
1039
1040void mt76u_queues_deinit(struct mt76_dev *dev)
1041{
1042 mt76u_stop_rx(dev);
1043 mt76u_stop_tx(dev);
1044
1045 mt76u_free_rx(dev);
1046 mt76u_free_tx(dev);
1047}
1048EXPORT_SYMBOL_GPL(mt76u_queues_deinit);
1049
1050int mt76u_alloc_queues(struct mt76_dev *dev)
1051{
1052 int err;
1053
1054 err = mt76u_alloc_rx_queue(dev, MT_RXQ_MAIN);
1055 if (err < 0)
1056 return err;
1057
1058 return mt76u_alloc_tx(dev);
1059}
1060EXPORT_SYMBOL_GPL(mt76u_alloc_queues);
1061
1062static const struct mt76_queue_ops usb_queue_ops = {
1063 .tx_queue_skb = mt76u_tx_queue_skb,
1064 .kick = mt76u_tx_kick,
1065};
1066
1067int __mt76u_init(struct mt76_dev *dev, struct usb_interface *intf,
1068 struct mt76_bus_ops *ops)
1069{
1070 struct usb_device *udev = interface_to_usbdev(intf);
1071 struct mt76_usb *usb = &dev->usb;
1072 int err;
1073
1074 INIT_WORK(&usb->stat_work, mt76u_tx_status_data);
1075
1076 usb->data_len = usb_maxpacket(udev, usb_sndctrlpipe(udev, 0));
1077 if (usb->data_len < 32)
1078 usb->data_len = 32;
1079
1080 usb->data = devm_kmalloc(dev->dev, usb->data_len, GFP_KERNEL);
1081 if (!usb->data)
1082 return -ENOMEM;
1083
1084 mutex_init(&usb->usb_ctrl_mtx);
1085 dev->bus = ops;
1086 dev->queue_ops = &usb_queue_ops;
1087
1088 dev_set_drvdata(&udev->dev, dev);
1089
1090 usb->sg_en = mt76u_check_sg(dev);
1091
1092 err = mt76u_set_endpoints(intf, usb);
1093 if (err < 0)
1094 return err;
1095
1096 err = mt76_worker_setup(dev->hw, &usb->rx_worker, mt76u_rx_worker,
1097 "usb-rx");
1098 if (err)
1099 return err;
1100
1101 err = mt76_worker_setup(dev->hw, &usb->status_worker,
1102 mt76u_status_worker, "usb-status");
1103 if (err)
1104 return err;
1105
1106 sched_set_fifo_low(usb->rx_worker.task);
1107 sched_set_fifo_low(usb->status_worker.task);
1108
1109 return 0;
1110}
1111EXPORT_SYMBOL_GPL(__mt76u_init);
1112
1113int mt76u_init(struct mt76_dev *dev, struct usb_interface *intf)
1114{
1115 static struct mt76_bus_ops bus_ops = {
1116 .rr = mt76u_rr,
1117 .wr = mt76u_wr,
1118 .rmw = mt76u_rmw,
1119 .read_copy = mt76u_read_copy,
1120 .write_copy = mt76u_copy,
1121 .wr_rp = mt76u_wr_rp,
1122 .rd_rp = mt76u_rd_rp,
1123 .type = MT76_BUS_USB,
1124 };
1125
1126 return __mt76u_init(dev, intf, &bus_ops);
1127}
1128EXPORT_SYMBOL_GPL(mt76u_init);
1129
1130MODULE_AUTHOR("Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>");
1131MODULE_DESCRIPTION("MediaTek MT76x USB helpers");
1132MODULE_LICENSE("Dual BSD/GPL");