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b40b15e1 LB |
1 | /* |
2 | * Copyright (C) 2018 Lorenzo Bianconi <lorenzo.bianconi83@gmail.com> | |
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 | ||
db6bb5c6 | 17 | #include <linux/module.h> |
b40b15e1 LB |
18 | #include "mt76.h" |
19 | #include "usb_trace.h" | |
20 | #include "dma.h" | |
21 | ||
22 | #define MT_VEND_REQ_MAX_RETRY 10 | |
23 | #define MT_VEND_REQ_TOUT_MS 300 | |
24 | ||
c2908a0d LB |
25 | static bool disable_usb_sg; |
26 | module_param_named(disable_usb_sg, disable_usb_sg, bool, 0644); | |
27 | MODULE_PARM_DESC(disable_usb_sg, "Disable usb scatter-gather support"); | |
28 | ||
b40b15e1 LB |
29 | /* should be called with usb_ctrl_mtx locked */ |
30 | static int __mt76u_vendor_request(struct mt76_dev *dev, u8 req, | |
31 | u8 req_type, u16 val, u16 offset, | |
32 | void *buf, size_t len) | |
33 | { | |
34 | struct usb_interface *intf = to_usb_interface(dev->dev); | |
35 | struct usb_device *udev = interface_to_usbdev(intf); | |
36 | unsigned int pipe; | |
37 | int i, ret; | |
38 | ||
39 | pipe = (req_type & USB_DIR_IN) ? usb_rcvctrlpipe(udev, 0) | |
40 | : usb_sndctrlpipe(udev, 0); | |
41 | for (i = 0; i < MT_VEND_REQ_MAX_RETRY; i++) { | |
42 | if (test_bit(MT76_REMOVED, &dev->state)) | |
43 | return -EIO; | |
44 | ||
45 | ret = usb_control_msg(udev, pipe, req, req_type, val, | |
46 | offset, buf, len, MT_VEND_REQ_TOUT_MS); | |
47 | if (ret == -ENODEV) | |
48 | set_bit(MT76_REMOVED, &dev->state); | |
49 | if (ret >= 0 || ret == -ENODEV) | |
50 | return ret; | |
51 | usleep_range(5000, 10000); | |
52 | } | |
53 | ||
54 | dev_err(dev->dev, "vendor request req:%02x off:%04x failed:%d\n", | |
55 | req, offset, ret); | |
56 | return ret; | |
57 | } | |
58 | ||
59 | int mt76u_vendor_request(struct mt76_dev *dev, u8 req, | |
60 | u8 req_type, u16 val, u16 offset, | |
61 | void *buf, size_t len) | |
62 | { | |
63 | int ret; | |
64 | ||
65 | mutex_lock(&dev->usb.usb_ctrl_mtx); | |
66 | ret = __mt76u_vendor_request(dev, req, req_type, | |
67 | val, offset, buf, len); | |
68 | trace_usb_reg_wr(dev, offset, val); | |
69 | mutex_unlock(&dev->usb.usb_ctrl_mtx); | |
70 | ||
71 | return ret; | |
72 | } | |
73 | EXPORT_SYMBOL_GPL(mt76u_vendor_request); | |
74 | ||
75 | /* should be called with usb_ctrl_mtx locked */ | |
76 | static u32 __mt76u_rr(struct mt76_dev *dev, u32 addr) | |
77 | { | |
78 | struct mt76_usb *usb = &dev->usb; | |
79 | u32 data = ~0; | |
80 | u16 offset; | |
81 | int ret; | |
82 | u8 req; | |
83 | ||
84 | switch (addr & MT_VEND_TYPE_MASK) { | |
85 | case MT_VEND_TYPE_EEPROM: | |
86 | req = MT_VEND_READ_EEPROM; | |
87 | break; | |
88 | case MT_VEND_TYPE_CFG: | |
89 | req = MT_VEND_READ_CFG; | |
90 | break; | |
91 | default: | |
92 | req = MT_VEND_MULTI_READ; | |
93 | break; | |
94 | } | |
95 | offset = addr & ~MT_VEND_TYPE_MASK; | |
96 | ||
97 | ret = __mt76u_vendor_request(dev, req, | |
98 | USB_DIR_IN | USB_TYPE_VENDOR, | |
99 | 0, offset, usb->data, sizeof(__le32)); | |
100 | if (ret == sizeof(__le32)) | |
101 | data = get_unaligned_le32(usb->data); | |
102 | trace_usb_reg_rr(dev, addr, data); | |
103 | ||
104 | return data; | |
105 | } | |
106 | ||
5567b373 | 107 | static u32 mt76u_rr(struct mt76_dev *dev, u32 addr) |
b40b15e1 LB |
108 | { |
109 | u32 ret; | |
110 | ||
111 | mutex_lock(&dev->usb.usb_ctrl_mtx); | |
112 | ret = __mt76u_rr(dev, addr); | |
113 | mutex_unlock(&dev->usb.usb_ctrl_mtx); | |
114 | ||
115 | return ret; | |
116 | } | |
117 | ||
118 | /* should be called with usb_ctrl_mtx locked */ | |
119 | static void __mt76u_wr(struct mt76_dev *dev, u32 addr, u32 val) | |
120 | { | |
121 | struct mt76_usb *usb = &dev->usb; | |
122 | u16 offset; | |
123 | u8 req; | |
124 | ||
125 | switch (addr & MT_VEND_TYPE_MASK) { | |
126 | case MT_VEND_TYPE_CFG: | |
127 | req = MT_VEND_WRITE_CFG; | |
128 | break; | |
129 | default: | |
130 | req = MT_VEND_MULTI_WRITE; | |
131 | break; | |
132 | } | |
133 | offset = addr & ~MT_VEND_TYPE_MASK; | |
134 | ||
135 | put_unaligned_le32(val, usb->data); | |
136 | __mt76u_vendor_request(dev, req, | |
137 | USB_DIR_OUT | USB_TYPE_VENDOR, 0, | |
138 | offset, usb->data, sizeof(__le32)); | |
139 | trace_usb_reg_wr(dev, addr, val); | |
140 | } | |
141 | ||
5567b373 | 142 | static void mt76u_wr(struct mt76_dev *dev, u32 addr, u32 val) |
b40b15e1 LB |
143 | { |
144 | mutex_lock(&dev->usb.usb_ctrl_mtx); | |
145 | __mt76u_wr(dev, addr, val); | |
146 | mutex_unlock(&dev->usb.usb_ctrl_mtx); | |
147 | } | |
148 | ||
149 | static u32 mt76u_rmw(struct mt76_dev *dev, u32 addr, | |
150 | u32 mask, u32 val) | |
151 | { | |
152 | mutex_lock(&dev->usb.usb_ctrl_mtx); | |
153 | val |= __mt76u_rr(dev, addr) & ~mask; | |
154 | __mt76u_wr(dev, addr, val); | |
155 | mutex_unlock(&dev->usb.usb_ctrl_mtx); | |
156 | ||
157 | return val; | |
158 | } | |
159 | ||
160 | static void mt76u_copy(struct mt76_dev *dev, u32 offset, | |
161 | const void *data, int len) | |
162 | { | |
163 | struct mt76_usb *usb = &dev->usb; | |
164 | const u32 *val = data; | |
165 | int i, ret; | |
166 | ||
167 | mutex_lock(&usb->usb_ctrl_mtx); | |
168 | for (i = 0; i < (len / 4); i++) { | |
169 | put_unaligned_le32(val[i], usb->data); | |
170 | ret = __mt76u_vendor_request(dev, MT_VEND_MULTI_WRITE, | |
171 | USB_DIR_OUT | USB_TYPE_VENDOR, | |
172 | 0, offset + i * 4, usb->data, | |
173 | sizeof(__le32)); | |
174 | if (ret < 0) | |
175 | break; | |
176 | } | |
177 | mutex_unlock(&usb->usb_ctrl_mtx); | |
178 | } | |
179 | ||
180 | void mt76u_single_wr(struct mt76_dev *dev, const u8 req, | |
181 | const u16 offset, const u32 val) | |
182 | { | |
183 | mutex_lock(&dev->usb.usb_ctrl_mtx); | |
184 | __mt76u_vendor_request(dev, req, | |
185 | USB_DIR_OUT | USB_TYPE_VENDOR, | |
186 | val & 0xffff, offset, NULL, 0); | |
187 | __mt76u_vendor_request(dev, req, | |
188 | USB_DIR_OUT | USB_TYPE_VENDOR, | |
189 | val >> 16, offset + 2, NULL, 0); | |
190 | mutex_unlock(&dev->usb.usb_ctrl_mtx); | |
191 | } | |
192 | EXPORT_SYMBOL_GPL(mt76u_single_wr); | |
193 | ||
f1638c7c SG |
194 | static int |
195 | mt76u_req_wr_rp(struct mt76_dev *dev, u32 base, | |
196 | const struct mt76_reg_pair *data, int len) | |
197 | { | |
198 | struct mt76_usb *usb = &dev->usb; | |
199 | ||
200 | mutex_lock(&usb->usb_ctrl_mtx); | |
201 | while (len > 0) { | |
202 | __mt76u_wr(dev, base + data->reg, data->value); | |
203 | len--; | |
204 | data++; | |
205 | } | |
206 | mutex_unlock(&usb->usb_ctrl_mtx); | |
207 | ||
208 | return 0; | |
209 | } | |
210 | ||
17507157 LB |
211 | static int |
212 | mt76u_wr_rp(struct mt76_dev *dev, u32 base, | |
213 | const struct mt76_reg_pair *data, int n) | |
f1638c7c SG |
214 | { |
215 | if (test_bit(MT76_STATE_MCU_RUNNING, &dev->state)) | |
17507157 | 216 | return dev->mcu_ops->mcu_wr_rp(dev, base, data, n); |
f1638c7c SG |
217 | else |
218 | return mt76u_req_wr_rp(dev, base, data, n); | |
219 | } | |
f1638c7c SG |
220 | |
221 | static int | |
222 | mt76u_req_rd_rp(struct mt76_dev *dev, u32 base, struct mt76_reg_pair *data, | |
223 | int len) | |
224 | { | |
225 | struct mt76_usb *usb = &dev->usb; | |
226 | ||
227 | mutex_lock(&usb->usb_ctrl_mtx); | |
228 | while (len > 0) { | |
229 | data->value = __mt76u_rr(dev, base + data->reg); | |
230 | len--; | |
231 | data++; | |
232 | } | |
233 | mutex_unlock(&usb->usb_ctrl_mtx); | |
234 | ||
235 | return 0; | |
236 | } | |
237 | ||
17507157 LB |
238 | static int |
239 | mt76u_rd_rp(struct mt76_dev *dev, u32 base, | |
240 | struct mt76_reg_pair *data, int n) | |
f1638c7c SG |
241 | { |
242 | if (test_bit(MT76_STATE_MCU_RUNNING, &dev->state)) | |
17507157 | 243 | return dev->mcu_ops->mcu_rd_rp(dev, base, data, n); |
f1638c7c SG |
244 | else |
245 | return mt76u_req_rd_rp(dev, base, data, n); | |
246 | } | |
f1638c7c | 247 | |
63a7de5d LB |
248 | static bool mt76u_check_sg(struct mt76_dev *dev) |
249 | { | |
250 | struct usb_interface *intf = to_usb_interface(dev->dev); | |
251 | struct usb_device *udev = interface_to_usbdev(intf); | |
252 | ||
c2908a0d | 253 | return (!disable_usb_sg && udev->bus->sg_tablesize > 0 && |
63a7de5d LB |
254 | (udev->bus->no_sg_constraint || |
255 | udev->speed == USB_SPEED_WIRELESS)); | |
256 | } | |
257 | ||
b40b15e1 LB |
258 | static int |
259 | mt76u_set_endpoints(struct usb_interface *intf, | |
260 | struct mt76_usb *usb) | |
261 | { | |
262 | struct usb_host_interface *intf_desc = intf->cur_altsetting; | |
263 | struct usb_endpoint_descriptor *ep_desc; | |
264 | int i, in_ep = 0, out_ep = 0; | |
265 | ||
266 | for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) { | |
267 | ep_desc = &intf_desc->endpoint[i].desc; | |
268 | ||
269 | if (usb_endpoint_is_bulk_in(ep_desc) && | |
270 | in_ep < __MT_EP_IN_MAX) { | |
271 | usb->in_ep[in_ep] = usb_endpoint_num(ep_desc); | |
272 | usb->in_max_packet = usb_endpoint_maxp(ep_desc); | |
273 | in_ep++; | |
274 | } else if (usb_endpoint_is_bulk_out(ep_desc) && | |
275 | out_ep < __MT_EP_OUT_MAX) { | |
276 | usb->out_ep[out_ep] = usb_endpoint_num(ep_desc); | |
277 | usb->out_max_packet = usb_endpoint_maxp(ep_desc); | |
278 | out_ep++; | |
279 | } | |
280 | } | |
281 | ||
282 | if (in_ep != __MT_EP_IN_MAX || out_ep != __MT_EP_OUT_MAX) | |
283 | return -EINVAL; | |
284 | return 0; | |
285 | } | |
286 | ||
287 | static int | |
288 | mt76u_fill_rx_sg(struct mt76_dev *dev, struct mt76u_buf *buf, | |
289 | int nsgs, int len, int sglen) | |
290 | { | |
c12128ce | 291 | struct mt76_queue *q = &dev->q_rx[MT_RXQ_MAIN]; |
b40b15e1 LB |
292 | struct urb *urb = buf->urb; |
293 | int i; | |
294 | ||
481bb043 | 295 | spin_lock_bh(&q->rx_page_lock); |
b40b15e1 LB |
296 | for (i = 0; i < nsgs; i++) { |
297 | struct page *page; | |
298 | void *data; | |
299 | int offset; | |
300 | ||
c87dff8c | 301 | data = page_frag_alloc(&q->rx_page, len, GFP_ATOMIC); |
b40b15e1 LB |
302 | if (!data) |
303 | break; | |
304 | ||
305 | page = virt_to_head_page(data); | |
306 | offset = data - page_address(page); | |
307 | sg_set_page(&urb->sg[i], page, sglen, offset); | |
308 | } | |
481bb043 | 309 | spin_unlock_bh(&q->rx_page_lock); |
b40b15e1 LB |
310 | |
311 | if (i < nsgs) { | |
312 | int j; | |
313 | ||
314 | for (j = nsgs; j < urb->num_sgs; j++) | |
315 | skb_free_frag(sg_virt(&urb->sg[j])); | |
316 | urb->num_sgs = i; | |
317 | } | |
318 | ||
319 | urb->num_sgs = max_t(int, i, urb->num_sgs); | |
320 | buf->len = urb->num_sgs * sglen, | |
321 | sg_init_marker(urb->sg, urb->num_sgs); | |
322 | ||
323 | return i ? : -ENOMEM; | |
324 | } | |
325 | ||
d704d16f LB |
326 | static int |
327 | mt76u_buf_alloc_sg(struct mt76_dev *dev, struct mt76u_buf *buf, | |
328 | int nsgs, int len, int sglen, gfp_t gfp) | |
b40b15e1 LB |
329 | { |
330 | buf->urb = usb_alloc_urb(0, gfp); | |
331 | if (!buf->urb) | |
332 | return -ENOMEM; | |
333 | ||
329e0989 | 334 | buf->urb->sg = devm_kcalloc(dev->dev, nsgs, sizeof(*buf->urb->sg), |
b40b15e1 LB |
335 | gfp); |
336 | if (!buf->urb->sg) | |
337 | return -ENOMEM; | |
338 | ||
339 | sg_init_table(buf->urb->sg, nsgs); | |
340 | buf->dev = dev; | |
341 | ||
342 | return mt76u_fill_rx_sg(dev, buf, nsgs, len, sglen); | |
343 | } | |
b40b15e1 | 344 | |
d704d16f LB |
345 | int mt76u_buf_alloc(struct mt76_dev *dev, struct mt76u_buf *buf, |
346 | int len, int data_len, gfp_t gfp) | |
347 | { | |
348 | struct mt76_queue *q = &dev->q_rx[MT_RXQ_MAIN]; | |
349 | ||
350 | buf->urb = usb_alloc_urb(0, gfp); | |
351 | if (!buf->urb) | |
352 | return -ENOMEM; | |
353 | ||
354 | buf->buf = page_frag_alloc(&q->rx_page, len, gfp); | |
355 | if (!buf->buf) | |
356 | return -ENOMEM; | |
357 | ||
358 | buf->len = data_len; | |
359 | buf->dev = dev; | |
360 | ||
361 | return 0; | |
362 | } | |
363 | ||
b40b15e1 LB |
364 | void mt76u_buf_free(struct mt76u_buf *buf) |
365 | { | |
366 | struct urb *urb = buf->urb; | |
cb83585e | 367 | struct scatterlist *sg; |
b40b15e1 LB |
368 | int i; |
369 | ||
cb83585e LB |
370 | for (i = 0; i < urb->num_sgs; i++) { |
371 | sg = &urb->sg[i]; | |
372 | if (!sg) | |
373 | continue; | |
374 | ||
375 | skb_free_frag(sg_virt(sg)); | |
376 | } | |
d704d16f LB |
377 | if (buf->buf) |
378 | skb_free_frag(buf->buf); | |
379 | ||
b40b15e1 LB |
380 | usb_free_urb(buf->urb); |
381 | } | |
382 | EXPORT_SYMBOL_GPL(mt76u_buf_free); | |
383 | ||
384 | int mt76u_submit_buf(struct mt76_dev *dev, int dir, int index, | |
385 | struct mt76u_buf *buf, gfp_t gfp, | |
386 | usb_complete_t complete_fn, void *context) | |
387 | { | |
388 | struct usb_interface *intf = to_usb_interface(dev->dev); | |
389 | struct usb_device *udev = interface_to_usbdev(intf); | |
d704d16f | 390 | u8 *data = buf->urb->num_sgs ? NULL : buf->buf; |
b40b15e1 LB |
391 | unsigned int pipe; |
392 | ||
393 | if (dir == USB_DIR_IN) | |
394 | pipe = usb_rcvbulkpipe(udev, dev->usb.in_ep[index]); | |
395 | else | |
396 | pipe = usb_sndbulkpipe(udev, dev->usb.out_ep[index]); | |
397 | ||
d704d16f | 398 | usb_fill_bulk_urb(buf->urb, udev, pipe, data, buf->len, |
b40b15e1 | 399 | complete_fn, context); |
e0168dc6 | 400 | trace_submit_urb(dev, buf->urb); |
b40b15e1 LB |
401 | |
402 | return usb_submit_urb(buf->urb, gfp); | |
403 | } | |
404 | EXPORT_SYMBOL_GPL(mt76u_submit_buf); | |
405 | ||
406 | static inline struct mt76u_buf | |
407 | *mt76u_get_next_rx_entry(struct mt76_queue *q) | |
408 | { | |
409 | struct mt76u_buf *buf = NULL; | |
410 | unsigned long flags; | |
411 | ||
412 | spin_lock_irqsave(&q->lock, flags); | |
413 | if (q->queued > 0) { | |
414 | buf = &q->entry[q->head].ubuf; | |
415 | q->head = (q->head + 1) % q->ndesc; | |
416 | q->queued--; | |
417 | } | |
418 | spin_unlock_irqrestore(&q->lock, flags); | |
419 | ||
420 | return buf; | |
421 | } | |
422 | ||
423 | static int mt76u_get_rx_entry_len(u8 *data, u32 data_len) | |
424 | { | |
425 | u16 dma_len, min_len; | |
426 | ||
427 | dma_len = get_unaligned_le16(data); | |
428 | min_len = MT_DMA_HDR_LEN + MT_RX_RXWI_LEN + | |
429 | MT_FCE_INFO_LEN; | |
430 | ||
09dbcd8b LB |
431 | if (data_len < min_len || !dma_len || |
432 | dma_len + MT_DMA_HDR_LEN > data_len || | |
433 | (dma_len & 0x3)) | |
b40b15e1 LB |
434 | return -EINVAL; |
435 | return dma_len; | |
436 | } | |
437 | ||
438 | static int | |
f7522949 | 439 | mt76u_process_rx_entry(struct mt76_dev *dev, struct mt76u_buf *buf) |
b40b15e1 LB |
440 | { |
441 | struct mt76_queue *q = &dev->q_rx[MT_RXQ_MAIN]; | |
f7522949 LB |
442 | struct urb *urb = buf->urb; |
443 | u8 *data = urb->num_sgs ? sg_virt(&urb->sg[0]) : buf->buf; | |
b40b15e1 LB |
444 | int data_len, len, nsgs = 1; |
445 | struct sk_buff *skb; | |
446 | ||
447 | if (!test_bit(MT76_STATE_INITIALIZED, &dev->state)) | |
448 | return 0; | |
449 | ||
450 | len = mt76u_get_rx_entry_len(data, urb->actual_length); | |
451 | if (len < 0) | |
452 | return 0; | |
453 | ||
f7522949 LB |
454 | data_len = urb->num_sgs ? urb->sg[0].length : buf->len; |
455 | data_len = min_t(int, len, data_len - MT_DMA_HDR_LEN); | |
0ecf94dc LB |
456 | if (MT_DMA_HDR_LEN + data_len > SKB_WITH_OVERHEAD(q->buf_size)) |
457 | return 0; | |
458 | ||
b40b15e1 LB |
459 | skb = build_skb(data, q->buf_size); |
460 | if (!skb) | |
461 | return 0; | |
462 | ||
b40b15e1 | 463 | skb_reserve(skb, MT_DMA_HDR_LEN); |
b40b15e1 LB |
464 | __skb_put(skb, data_len); |
465 | len -= data_len; | |
466 | ||
f7522949 | 467 | while (len > 0 && urb->num_sgs) { |
b40b15e1 LB |
468 | data_len = min_t(int, len, urb->sg[nsgs].length); |
469 | skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, | |
470 | sg_page(&urb->sg[nsgs]), | |
471 | urb->sg[nsgs].offset, | |
472 | data_len, q->buf_size); | |
473 | len -= data_len; | |
474 | nsgs++; | |
475 | } | |
476 | dev->drv->rx_skb(dev, MT_RXQ_MAIN, skb); | |
477 | ||
478 | return nsgs; | |
479 | } | |
480 | ||
481 | static void mt76u_complete_rx(struct urb *urb) | |
482 | { | |
483 | struct mt76_dev *dev = urb->context; | |
484 | struct mt76_queue *q = &dev->q_rx[MT_RXQ_MAIN]; | |
485 | unsigned long flags; | |
486 | ||
e0168dc6 LB |
487 | trace_rx_urb(dev, urb); |
488 | ||
b40b15e1 LB |
489 | switch (urb->status) { |
490 | case -ECONNRESET: | |
491 | case -ESHUTDOWN: | |
492 | case -ENOENT: | |
493 | return; | |
494 | default: | |
4bfff1ec LB |
495 | dev_err_ratelimited(dev->dev, "rx urb failed: %d\n", |
496 | urb->status); | |
b40b15e1 LB |
497 | /* fall through */ |
498 | case 0: | |
499 | break; | |
500 | } | |
501 | ||
502 | spin_lock_irqsave(&q->lock, flags); | |
503 | if (WARN_ONCE(q->entry[q->tail].ubuf.urb != urb, "rx urb mismatch")) | |
504 | goto out; | |
505 | ||
506 | q->tail = (q->tail + 1) % q->ndesc; | |
507 | q->queued++; | |
508 | tasklet_schedule(&dev->usb.rx_tasklet); | |
509 | out: | |
510 | spin_unlock_irqrestore(&q->lock, flags); | |
511 | } | |
512 | ||
f7522949 LB |
513 | static int |
514 | mt76u_refill_rx(struct mt76_dev *dev, struct mt76_queue *q, | |
515 | struct mt76u_buf *buf, int nsgs) | |
516 | { | |
517 | if (dev->usb.sg_en) { | |
518 | return mt76u_fill_rx_sg(dev, buf, nsgs, q->buf_size, | |
519 | SKB_WITH_OVERHEAD(q->buf_size)); | |
520 | } else { | |
521 | buf->buf = page_frag_alloc(&q->rx_page, q->buf_size, | |
522 | GFP_ATOMIC); | |
523 | return buf->buf ? 0 : -ENOMEM; | |
524 | } | |
525 | } | |
526 | ||
b40b15e1 LB |
527 | static void mt76u_rx_tasklet(unsigned long data) |
528 | { | |
529 | struct mt76_dev *dev = (struct mt76_dev *)data; | |
530 | struct mt76_queue *q = &dev->q_rx[MT_RXQ_MAIN]; | |
b40b15e1 | 531 | struct mt76u_buf *buf; |
f7522949 | 532 | int err, count; |
b40b15e1 LB |
533 | |
534 | rcu_read_lock(); | |
535 | ||
536 | while (true) { | |
537 | buf = mt76u_get_next_rx_entry(q); | |
538 | if (!buf) | |
539 | break; | |
540 | ||
f7522949 LB |
541 | count = mt76u_process_rx_entry(dev, buf); |
542 | if (count > 0) { | |
543 | err = mt76u_refill_rx(dev, q, buf, count); | |
b40b15e1 LB |
544 | if (err < 0) |
545 | break; | |
546 | } | |
547 | mt76u_submit_buf(dev, USB_DIR_IN, MT_EP_IN_PKT_RX, | |
548 | buf, GFP_ATOMIC, | |
549 | mt76u_complete_rx, dev); | |
550 | } | |
551 | mt76_rx_poll_complete(dev, MT_RXQ_MAIN, NULL); | |
552 | ||
553 | rcu_read_unlock(); | |
554 | } | |
555 | ||
556 | int mt76u_submit_rx_buffers(struct mt76_dev *dev) | |
557 | { | |
558 | struct mt76_queue *q = &dev->q_rx[MT_RXQ_MAIN]; | |
559 | unsigned long flags; | |
560 | int i, err = 0; | |
561 | ||
562 | spin_lock_irqsave(&q->lock, flags); | |
563 | for (i = 0; i < q->ndesc; i++) { | |
564 | err = mt76u_submit_buf(dev, USB_DIR_IN, MT_EP_IN_PKT_RX, | |
565 | &q->entry[i].ubuf, GFP_ATOMIC, | |
566 | mt76u_complete_rx, dev); | |
567 | if (err < 0) | |
568 | break; | |
569 | } | |
570 | q->head = q->tail = 0; | |
571 | q->queued = 0; | |
572 | spin_unlock_irqrestore(&q->lock, flags); | |
573 | ||
574 | return err; | |
575 | } | |
576 | EXPORT_SYMBOL_GPL(mt76u_submit_rx_buffers); | |
577 | ||
578 | static int mt76u_alloc_rx(struct mt76_dev *dev) | |
579 | { | |
580 | struct mt76_queue *q = &dev->q_rx[MT_RXQ_MAIN]; | |
f7522949 | 581 | int i, err; |
b40b15e1 | 582 | |
481bb043 | 583 | spin_lock_init(&q->rx_page_lock); |
b40b15e1 | 584 | spin_lock_init(&q->lock); |
329e0989 KC |
585 | q->entry = devm_kcalloc(dev->dev, |
586 | MT_NUM_RX_ENTRIES, sizeof(*q->entry), | |
b40b15e1 LB |
587 | GFP_KERNEL); |
588 | if (!q->entry) | |
589 | return -ENOMEM; | |
590 | ||
f7522949 | 591 | q->buf_size = dev->usb.sg_en ? MT_RX_BUF_SIZE : PAGE_SIZE; |
cb83585e LB |
592 | q->ndesc = MT_NUM_RX_ENTRIES; |
593 | for (i = 0; i < q->ndesc; i++) { | |
f7522949 LB |
594 | if (dev->usb.sg_en) |
595 | err = mt76u_buf_alloc_sg(dev, &q->entry[i].ubuf, | |
596 | MT_SG_MAX_SIZE, q->buf_size, | |
597 | SKB_WITH_OVERHEAD(q->buf_size), | |
598 | GFP_KERNEL); | |
599 | else | |
600 | err = mt76u_buf_alloc(dev, &q->entry[i].ubuf, | |
601 | q->buf_size, | |
602 | SKB_WITH_OVERHEAD(q->buf_size), | |
603 | GFP_KERNEL); | |
b40b15e1 LB |
604 | if (err < 0) |
605 | return err; | |
606 | } | |
b40b15e1 LB |
607 | |
608 | return mt76u_submit_rx_buffers(dev); | |
609 | } | |
610 | ||
611 | static void mt76u_free_rx(struct mt76_dev *dev) | |
612 | { | |
613 | struct mt76_queue *q = &dev->q_rx[MT_RXQ_MAIN]; | |
c12128ce | 614 | struct page *page; |
b40b15e1 LB |
615 | int i; |
616 | ||
617 | for (i = 0; i < q->ndesc; i++) | |
618 | mt76u_buf_free(&q->entry[i].ubuf); | |
c12128ce | 619 | |
481bb043 | 620 | spin_lock_bh(&q->rx_page_lock); |
c12128ce | 621 | if (!q->rx_page.va) |
481bb043 | 622 | goto out; |
c12128ce FF |
623 | |
624 | page = virt_to_page(q->rx_page.va); | |
625 | __page_frag_cache_drain(page, q->rx_page.pagecnt_bias); | |
626 | memset(&q->rx_page, 0, sizeof(q->rx_page)); | |
481bb043 LB |
627 | out: |
628 | spin_unlock_bh(&q->rx_page_lock); | |
b40b15e1 LB |
629 | } |
630 | ||
631 | static void mt76u_stop_rx(struct mt76_dev *dev) | |
632 | { | |
633 | struct mt76_queue *q = &dev->q_rx[MT_RXQ_MAIN]; | |
634 | int i; | |
635 | ||
636 | for (i = 0; i < q->ndesc; i++) | |
637 | usb_kill_urb(q->entry[i].ubuf.urb); | |
638 | } | |
639 | ||
b40b15e1 LB |
640 | static void mt76u_tx_tasklet(unsigned long data) |
641 | { | |
642 | struct mt76_dev *dev = (struct mt76_dev *)data; | |
e207afa0 | 643 | struct mt76_queue_entry entry; |
b40b15e1 LB |
644 | struct mt76u_buf *buf; |
645 | struct mt76_queue *q; | |
646 | bool wake; | |
647 | int i; | |
648 | ||
649 | for (i = 0; i < IEEE80211_NUM_ACS; i++) { | |
650 | q = &dev->q_tx[i]; | |
651 | ||
652 | spin_lock_bh(&q->lock); | |
653 | while (true) { | |
654 | buf = &q->entry[q->head].ubuf; | |
655 | if (!buf->done || !q->queued) | |
656 | break; | |
657 | ||
b40b15e1 LB |
658 | if (q->entry[q->head].schedule) { |
659 | q->entry[q->head].schedule = false; | |
660 | q->swq_queued--; | |
661 | } | |
662 | ||
e207afa0 | 663 | entry = q->entry[q->head]; |
b40b15e1 LB |
664 | q->head = (q->head + 1) % q->ndesc; |
665 | q->queued--; | |
e207afa0 LB |
666 | |
667 | spin_unlock_bh(&q->lock); | |
668 | dev->drv->tx_complete_skb(dev, q, &entry, false); | |
669 | spin_lock_bh(&q->lock); | |
b40b15e1 LB |
670 | } |
671 | mt76_txq_schedule(dev, q); | |
672 | wake = i < IEEE80211_NUM_ACS && q->queued < q->ndesc - 8; | |
673 | if (!q->queued) | |
674 | wake_up(&dev->tx_wait); | |
675 | ||
676 | spin_unlock_bh(&q->lock); | |
677 | ||
678 | if (!test_and_set_bit(MT76_READING_STATS, &dev->state)) | |
679 | ieee80211_queue_delayed_work(dev->hw, | |
680 | &dev->usb.stat_work, | |
681 | msecs_to_jiffies(10)); | |
682 | ||
683 | if (wake) | |
684 | ieee80211_wake_queue(dev->hw, i); | |
685 | } | |
686 | } | |
687 | ||
688 | static void mt76u_tx_status_data(struct work_struct *work) | |
689 | { | |
690 | struct mt76_usb *usb; | |
691 | struct mt76_dev *dev; | |
692 | u8 update = 1; | |
693 | u16 count = 0; | |
694 | ||
695 | usb = container_of(work, struct mt76_usb, stat_work.work); | |
696 | dev = container_of(usb, struct mt76_dev, usb); | |
697 | ||
698 | while (true) { | |
699 | if (test_bit(MT76_REMOVED, &dev->state)) | |
700 | break; | |
701 | ||
702 | if (!dev->drv->tx_status_data(dev, &update)) | |
703 | break; | |
704 | count++; | |
705 | } | |
706 | ||
707 | if (count && test_bit(MT76_STATE_RUNNING, &dev->state)) | |
708 | ieee80211_queue_delayed_work(dev->hw, &usb->stat_work, | |
709 | msecs_to_jiffies(10)); | |
710 | else | |
711 | clear_bit(MT76_READING_STATS, &dev->state); | |
712 | } | |
713 | ||
714 | static void mt76u_complete_tx(struct urb *urb) | |
715 | { | |
716 | struct mt76u_buf *buf = urb->context; | |
717 | struct mt76_dev *dev = buf->dev; | |
718 | ||
719 | if (mt76u_urb_error(urb)) | |
720 | dev_err(dev->dev, "tx urb failed: %d\n", urb->status); | |
721 | buf->done = true; | |
722 | ||
723 | tasklet_schedule(&dev->usb.tx_tasklet); | |
724 | } | |
725 | ||
726 | static int | |
727 | mt76u_tx_build_sg(struct sk_buff *skb, struct urb *urb) | |
728 | { | |
729 | int nsgs = 1 + skb_shinfo(skb)->nr_frags; | |
730 | struct sk_buff *iter; | |
731 | ||
732 | skb_walk_frags(skb, iter) | |
733 | nsgs += 1 + skb_shinfo(iter)->nr_frags; | |
734 | ||
735 | memset(urb->sg, 0, sizeof(*urb->sg) * MT_SG_MAX_SIZE); | |
736 | ||
737 | nsgs = min_t(int, MT_SG_MAX_SIZE, nsgs); | |
738 | sg_init_marker(urb->sg, nsgs); | |
739 | urb->num_sgs = nsgs; | |
740 | ||
741 | return skb_to_sgvec_nomark(skb, urb->sg, 0, skb->len); | |
742 | } | |
743 | ||
744 | static int | |
745 | mt76u_tx_queue_skb(struct mt76_dev *dev, struct mt76_queue *q, | |
746 | struct sk_buff *skb, struct mt76_wcid *wcid, | |
747 | struct ieee80211_sta *sta) | |
748 | { | |
749 | struct usb_interface *intf = to_usb_interface(dev->dev); | |
750 | struct usb_device *udev = interface_to_usbdev(intf); | |
f7522949 | 751 | u8 *data = NULL, ep = q2ep(q->hw_idx); |
b40b15e1 LB |
752 | struct mt76u_buf *buf; |
753 | u16 idx = q->tail; | |
754 | unsigned int pipe; | |
755 | int err; | |
756 | ||
757 | if (q->queued == q->ndesc) | |
758 | return -ENOSPC; | |
759 | ||
88046b2c | 760 | skb->prev = skb->next = NULL; |
b40b15e1 LB |
761 | err = dev->drv->tx_prepare_skb(dev, NULL, skb, q, wcid, sta, NULL); |
762 | if (err < 0) | |
763 | return err; | |
764 | ||
765 | buf = &q->entry[idx].ubuf; | |
766 | buf->done = false; | |
767 | ||
f7522949 LB |
768 | if (dev->usb.sg_en) { |
769 | err = mt76u_tx_build_sg(skb, buf->urb); | |
770 | if (err < 0) | |
771 | return err; | |
772 | } else { | |
773 | data = skb->data; | |
774 | } | |
b40b15e1 LB |
775 | |
776 | pipe = usb_sndbulkpipe(udev, dev->usb.out_ep[ep]); | |
f7522949 | 777 | usb_fill_bulk_urb(buf->urb, udev, pipe, data, skb->len, |
b40b15e1 LB |
778 | mt76u_complete_tx, buf); |
779 | ||
780 | q->tail = (q->tail + 1) % q->ndesc; | |
781 | q->entry[idx].skb = skb; | |
782 | q->queued++; | |
783 | ||
784 | return idx; | |
785 | } | |
786 | ||
787 | static void mt76u_tx_kick(struct mt76_dev *dev, struct mt76_queue *q) | |
788 | { | |
789 | struct mt76u_buf *buf; | |
790 | int err; | |
791 | ||
792 | while (q->first != q->tail) { | |
793 | buf = &q->entry[q->first].ubuf; | |
e0168dc6 LB |
794 | |
795 | trace_submit_urb(dev, buf->urb); | |
b40b15e1 LB |
796 | err = usb_submit_urb(buf->urb, GFP_ATOMIC); |
797 | if (err < 0) { | |
798 | if (err == -ENODEV) | |
799 | set_bit(MT76_REMOVED, &dev->state); | |
800 | else | |
801 | dev_err(dev->dev, "tx urb submit failed:%d\n", | |
802 | err); | |
803 | break; | |
804 | } | |
805 | q->first = (q->first + 1) % q->ndesc; | |
806 | } | |
807 | } | |
808 | ||
809 | static int mt76u_alloc_tx(struct mt76_dev *dev) | |
810 | { | |
811 | struct mt76u_buf *buf; | |
812 | struct mt76_queue *q; | |
b40b15e1 LB |
813 | int i, j; |
814 | ||
b40b15e1 LB |
815 | for (i = 0; i < IEEE80211_NUM_ACS; i++) { |
816 | q = &dev->q_tx[i]; | |
817 | spin_lock_init(&q->lock); | |
818 | INIT_LIST_HEAD(&q->swq); | |
1d0496c6 | 819 | q->hw_idx = mt76_ac_to_hwq(i); |
b40b15e1 | 820 | |
329e0989 KC |
821 | q->entry = devm_kcalloc(dev->dev, |
822 | MT_NUM_TX_ENTRIES, sizeof(*q->entry), | |
b40b15e1 LB |
823 | GFP_KERNEL); |
824 | if (!q->entry) | |
825 | return -ENOMEM; | |
826 | ||
827 | q->ndesc = MT_NUM_TX_ENTRIES; | |
828 | for (j = 0; j < q->ndesc; j++) { | |
829 | buf = &q->entry[j].ubuf; | |
830 | buf->dev = dev; | |
831 | ||
832 | buf->urb = usb_alloc_urb(0, GFP_KERNEL); | |
833 | if (!buf->urb) | |
834 | return -ENOMEM; | |
835 | ||
f7522949 LB |
836 | if (dev->usb.sg_en) { |
837 | size_t size = MT_SG_MAX_SIZE * | |
838 | sizeof(struct scatterlist); | |
839 | ||
840 | buf->urb->sg = devm_kzalloc(dev->dev, size, | |
841 | GFP_KERNEL); | |
842 | if (!buf->urb->sg) | |
843 | return -ENOMEM; | |
844 | } | |
b40b15e1 LB |
845 | } |
846 | } | |
847 | return 0; | |
848 | } | |
849 | ||
850 | static void mt76u_free_tx(struct mt76_dev *dev) | |
851 | { | |
852 | struct mt76_queue *q; | |
853 | int i, j; | |
854 | ||
855 | for (i = 0; i < IEEE80211_NUM_ACS; i++) { | |
856 | q = &dev->q_tx[i]; | |
857 | for (j = 0; j < q->ndesc; j++) | |
858 | usb_free_urb(q->entry[j].ubuf.urb); | |
859 | } | |
860 | } | |
861 | ||
862 | static void mt76u_stop_tx(struct mt76_dev *dev) | |
863 | { | |
864 | struct mt76_queue *q; | |
865 | int i, j; | |
866 | ||
867 | for (i = 0; i < IEEE80211_NUM_ACS; i++) { | |
868 | q = &dev->q_tx[i]; | |
869 | for (j = 0; j < q->ndesc; j++) | |
870 | usb_kill_urb(q->entry[j].ubuf.urb); | |
871 | } | |
872 | } | |
873 | ||
874 | void mt76u_stop_queues(struct mt76_dev *dev) | |
875 | { | |
876 | tasklet_disable(&dev->usb.rx_tasklet); | |
877 | tasklet_disable(&dev->usb.tx_tasklet); | |
878 | ||
879 | mt76u_stop_rx(dev); | |
880 | mt76u_stop_tx(dev); | |
881 | } | |
882 | EXPORT_SYMBOL_GPL(mt76u_stop_queues); | |
883 | ||
884 | void mt76u_stop_stat_wk(struct mt76_dev *dev) | |
885 | { | |
886 | cancel_delayed_work_sync(&dev->usb.stat_work); | |
887 | clear_bit(MT76_READING_STATS, &dev->state); | |
888 | } | |
889 | EXPORT_SYMBOL_GPL(mt76u_stop_stat_wk); | |
890 | ||
891 | void mt76u_queues_deinit(struct mt76_dev *dev) | |
892 | { | |
893 | mt76u_stop_queues(dev); | |
894 | ||
895 | mt76u_free_rx(dev); | |
896 | mt76u_free_tx(dev); | |
897 | } | |
898 | EXPORT_SYMBOL_GPL(mt76u_queues_deinit); | |
899 | ||
900 | int mt76u_alloc_queues(struct mt76_dev *dev) | |
901 | { | |
902 | int err; | |
903 | ||
904 | err = mt76u_alloc_rx(dev); | |
905 | if (err < 0) | |
b3098121 | 906 | return err; |
b40b15e1 | 907 | |
b3098121 | 908 | return mt76u_alloc_tx(dev); |
b40b15e1 LB |
909 | } |
910 | EXPORT_SYMBOL_GPL(mt76u_alloc_queues); | |
911 | ||
912 | static const struct mt76_queue_ops usb_queue_ops = { | |
913 | .tx_queue_skb = mt76u_tx_queue_skb, | |
914 | .kick = mt76u_tx_kick, | |
915 | }; | |
916 | ||
917 | int mt76u_init(struct mt76_dev *dev, | |
918 | struct usb_interface *intf) | |
919 | { | |
920 | static const struct mt76_bus_ops mt76u_ops = { | |
921 | .rr = mt76u_rr, | |
922 | .wr = mt76u_wr, | |
923 | .rmw = mt76u_rmw, | |
924 | .copy = mt76u_copy, | |
6da5a291 SG |
925 | .wr_rp = mt76u_wr_rp, |
926 | .rd_rp = mt76u_rd_rp, | |
c50479fa | 927 | .type = MT76_BUS_USB, |
b40b15e1 LB |
928 | }; |
929 | struct mt76_usb *usb = &dev->usb; | |
930 | ||
931 | tasklet_init(&usb->rx_tasklet, mt76u_rx_tasklet, (unsigned long)dev); | |
932 | tasklet_init(&usb->tx_tasklet, mt76u_tx_tasklet, (unsigned long)dev); | |
933 | INIT_DELAYED_WORK(&usb->stat_work, mt76u_tx_status_data); | |
934 | skb_queue_head_init(&dev->rx_skb[MT_RXQ_MAIN]); | |
935 | ||
936 | init_completion(&usb->mcu.cmpl); | |
937 | mutex_init(&usb->mcu.mutex); | |
938 | ||
939 | mutex_init(&usb->usb_ctrl_mtx); | |
940 | dev->bus = &mt76u_ops; | |
941 | dev->queue_ops = &usb_queue_ops; | |
942 | ||
63a7de5d LB |
943 | usb->sg_en = mt76u_check_sg(dev); |
944 | ||
b40b15e1 LB |
945 | return mt76u_set_endpoints(intf, usb); |
946 | } | |
947 | EXPORT_SYMBOL_GPL(mt76u_init); | |
948 | ||
949 | MODULE_AUTHOR("Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>"); | |
950 | MODULE_LICENSE("Dual BSD/GPL"); |