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mac80211: clean up get_tx_stats callback
[mirror_ubuntu-zesty-kernel.git] / drivers / net / wireless / b43legacy / dma.c
1 /*
2
3 Broadcom B43legacy wireless driver
4
5 DMA ringbuffer and descriptor allocation/management
6
7 Copyright (c) 2005, 2006 Michael Buesch <mb@bu3sch.de>
8
9 Some code in this file is derived from the b44.c driver
10 Copyright (C) 2002 David S. Miller
11 Copyright (C) Pekka Pietikainen
12
13 This program is free software; you can redistribute it and/or modify
14 it under the terms of the GNU General Public License as published by
15 the Free Software Foundation; either version 2 of the License, or
16 (at your option) any later version.
17
18 This program is distributed in the hope that it will be useful,
19 but WITHOUT ANY WARRANTY; without even the implied warranty of
20 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 GNU General Public License for more details.
22
23 You should have received a copy of the GNU General Public License
24 along with this program; see the file COPYING. If not, write to
25 the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor,
26 Boston, MA 02110-1301, USA.
27
28 */
29
30 #include "b43legacy.h"
31 #include "dma.h"
32 #include "main.h"
33 #include "debugfs.h"
34 #include "xmit.h"
35
36 #include <linux/dma-mapping.h>
37 #include <linux/pci.h>
38 #include <linux/delay.h>
39 #include <linux/skbuff.h>
40 #include <net/dst.h>
41
42 /* 32bit DMA ops. */
43 static
44 struct b43legacy_dmadesc_generic *op32_idx2desc(
45 struct b43legacy_dmaring *ring,
46 int slot,
47 struct b43legacy_dmadesc_meta **meta)
48 {
49 struct b43legacy_dmadesc32 *desc;
50
51 *meta = &(ring->meta[slot]);
52 desc = ring->descbase;
53 desc = &(desc[slot]);
54
55 return (struct b43legacy_dmadesc_generic *)desc;
56 }
57
58 static void op32_fill_descriptor(struct b43legacy_dmaring *ring,
59 struct b43legacy_dmadesc_generic *desc,
60 dma_addr_t dmaaddr, u16 bufsize,
61 int start, int end, int irq)
62 {
63 struct b43legacy_dmadesc32 *descbase = ring->descbase;
64 int slot;
65 u32 ctl;
66 u32 addr;
67 u32 addrext;
68
69 slot = (int)(&(desc->dma32) - descbase);
70 B43legacy_WARN_ON(!(slot >= 0 && slot < ring->nr_slots));
71
72 addr = (u32)(dmaaddr & ~SSB_DMA_TRANSLATION_MASK);
73 addrext = (u32)(dmaaddr & SSB_DMA_TRANSLATION_MASK)
74 >> SSB_DMA_TRANSLATION_SHIFT;
75 addr |= ssb_dma_translation(ring->dev->dev);
76 ctl = (bufsize - ring->frameoffset)
77 & B43legacy_DMA32_DCTL_BYTECNT;
78 if (slot == ring->nr_slots - 1)
79 ctl |= B43legacy_DMA32_DCTL_DTABLEEND;
80 if (start)
81 ctl |= B43legacy_DMA32_DCTL_FRAMESTART;
82 if (end)
83 ctl |= B43legacy_DMA32_DCTL_FRAMEEND;
84 if (irq)
85 ctl |= B43legacy_DMA32_DCTL_IRQ;
86 ctl |= (addrext << B43legacy_DMA32_DCTL_ADDREXT_SHIFT)
87 & B43legacy_DMA32_DCTL_ADDREXT_MASK;
88
89 desc->dma32.control = cpu_to_le32(ctl);
90 desc->dma32.address = cpu_to_le32(addr);
91 }
92
93 static void op32_poke_tx(struct b43legacy_dmaring *ring, int slot)
94 {
95 b43legacy_dma_write(ring, B43legacy_DMA32_TXINDEX,
96 (u32)(slot * sizeof(struct b43legacy_dmadesc32)));
97 }
98
99 static void op32_tx_suspend(struct b43legacy_dmaring *ring)
100 {
101 b43legacy_dma_write(ring, B43legacy_DMA32_TXCTL,
102 b43legacy_dma_read(ring, B43legacy_DMA32_TXCTL)
103 | B43legacy_DMA32_TXSUSPEND);
104 }
105
106 static void op32_tx_resume(struct b43legacy_dmaring *ring)
107 {
108 b43legacy_dma_write(ring, B43legacy_DMA32_TXCTL,
109 b43legacy_dma_read(ring, B43legacy_DMA32_TXCTL)
110 & ~B43legacy_DMA32_TXSUSPEND);
111 }
112
113 static int op32_get_current_rxslot(struct b43legacy_dmaring *ring)
114 {
115 u32 val;
116
117 val = b43legacy_dma_read(ring, B43legacy_DMA32_RXSTATUS);
118 val &= B43legacy_DMA32_RXDPTR;
119
120 return (val / sizeof(struct b43legacy_dmadesc32));
121 }
122
123 static void op32_set_current_rxslot(struct b43legacy_dmaring *ring,
124 int slot)
125 {
126 b43legacy_dma_write(ring, B43legacy_DMA32_RXINDEX,
127 (u32)(slot * sizeof(struct b43legacy_dmadesc32)));
128 }
129
130 static const struct b43legacy_dma_ops dma32_ops = {
131 .idx2desc = op32_idx2desc,
132 .fill_descriptor = op32_fill_descriptor,
133 .poke_tx = op32_poke_tx,
134 .tx_suspend = op32_tx_suspend,
135 .tx_resume = op32_tx_resume,
136 .get_current_rxslot = op32_get_current_rxslot,
137 .set_current_rxslot = op32_set_current_rxslot,
138 };
139
140 /* 64bit DMA ops. */
141 static
142 struct b43legacy_dmadesc_generic *op64_idx2desc(
143 struct b43legacy_dmaring *ring,
144 int slot,
145 struct b43legacy_dmadesc_meta
146 **meta)
147 {
148 struct b43legacy_dmadesc64 *desc;
149
150 *meta = &(ring->meta[slot]);
151 desc = ring->descbase;
152 desc = &(desc[slot]);
153
154 return (struct b43legacy_dmadesc_generic *)desc;
155 }
156
157 static void op64_fill_descriptor(struct b43legacy_dmaring *ring,
158 struct b43legacy_dmadesc_generic *desc,
159 dma_addr_t dmaaddr, u16 bufsize,
160 int start, int end, int irq)
161 {
162 struct b43legacy_dmadesc64 *descbase = ring->descbase;
163 int slot;
164 u32 ctl0 = 0;
165 u32 ctl1 = 0;
166 u32 addrlo;
167 u32 addrhi;
168 u32 addrext;
169
170 slot = (int)(&(desc->dma64) - descbase);
171 B43legacy_WARN_ON(!(slot >= 0 && slot < ring->nr_slots));
172
173 addrlo = (u32)(dmaaddr & 0xFFFFFFFF);
174 addrhi = (((u64)dmaaddr >> 32) & ~SSB_DMA_TRANSLATION_MASK);
175 addrext = (((u64)dmaaddr >> 32) & SSB_DMA_TRANSLATION_MASK)
176 >> SSB_DMA_TRANSLATION_SHIFT;
177 addrhi |= ssb_dma_translation(ring->dev->dev);
178 if (slot == ring->nr_slots - 1)
179 ctl0 |= B43legacy_DMA64_DCTL0_DTABLEEND;
180 if (start)
181 ctl0 |= B43legacy_DMA64_DCTL0_FRAMESTART;
182 if (end)
183 ctl0 |= B43legacy_DMA64_DCTL0_FRAMEEND;
184 if (irq)
185 ctl0 |= B43legacy_DMA64_DCTL0_IRQ;
186 ctl1 |= (bufsize - ring->frameoffset)
187 & B43legacy_DMA64_DCTL1_BYTECNT;
188 ctl1 |= (addrext << B43legacy_DMA64_DCTL1_ADDREXT_SHIFT)
189 & B43legacy_DMA64_DCTL1_ADDREXT_MASK;
190
191 desc->dma64.control0 = cpu_to_le32(ctl0);
192 desc->dma64.control1 = cpu_to_le32(ctl1);
193 desc->dma64.address_low = cpu_to_le32(addrlo);
194 desc->dma64.address_high = cpu_to_le32(addrhi);
195 }
196
197 static void op64_poke_tx(struct b43legacy_dmaring *ring, int slot)
198 {
199 b43legacy_dma_write(ring, B43legacy_DMA64_TXINDEX,
200 (u32)(slot * sizeof(struct b43legacy_dmadesc64)));
201 }
202
203 static void op64_tx_suspend(struct b43legacy_dmaring *ring)
204 {
205 b43legacy_dma_write(ring, B43legacy_DMA64_TXCTL,
206 b43legacy_dma_read(ring, B43legacy_DMA64_TXCTL)
207 | B43legacy_DMA64_TXSUSPEND);
208 }
209
210 static void op64_tx_resume(struct b43legacy_dmaring *ring)
211 {
212 b43legacy_dma_write(ring, B43legacy_DMA64_TXCTL,
213 b43legacy_dma_read(ring, B43legacy_DMA64_TXCTL)
214 & ~B43legacy_DMA64_TXSUSPEND);
215 }
216
217 static int op64_get_current_rxslot(struct b43legacy_dmaring *ring)
218 {
219 u32 val;
220
221 val = b43legacy_dma_read(ring, B43legacy_DMA64_RXSTATUS);
222 val &= B43legacy_DMA64_RXSTATDPTR;
223
224 return (val / sizeof(struct b43legacy_dmadesc64));
225 }
226
227 static void op64_set_current_rxslot(struct b43legacy_dmaring *ring,
228 int slot)
229 {
230 b43legacy_dma_write(ring, B43legacy_DMA64_RXINDEX,
231 (u32)(slot * sizeof(struct b43legacy_dmadesc64)));
232 }
233
234 static const struct b43legacy_dma_ops dma64_ops = {
235 .idx2desc = op64_idx2desc,
236 .fill_descriptor = op64_fill_descriptor,
237 .poke_tx = op64_poke_tx,
238 .tx_suspend = op64_tx_suspend,
239 .tx_resume = op64_tx_resume,
240 .get_current_rxslot = op64_get_current_rxslot,
241 .set_current_rxslot = op64_set_current_rxslot,
242 };
243
244
245 static inline int free_slots(struct b43legacy_dmaring *ring)
246 {
247 return (ring->nr_slots - ring->used_slots);
248 }
249
250 static inline int next_slot(struct b43legacy_dmaring *ring, int slot)
251 {
252 B43legacy_WARN_ON(!(slot >= -1 && slot <= ring->nr_slots - 1));
253 if (slot == ring->nr_slots - 1)
254 return 0;
255 return slot + 1;
256 }
257
258 static inline int prev_slot(struct b43legacy_dmaring *ring, int slot)
259 {
260 B43legacy_WARN_ON(!(slot >= 0 && slot <= ring->nr_slots - 1));
261 if (slot == 0)
262 return ring->nr_slots - 1;
263 return slot - 1;
264 }
265
266 #ifdef CONFIG_B43LEGACY_DEBUG
267 static void update_max_used_slots(struct b43legacy_dmaring *ring,
268 int current_used_slots)
269 {
270 if (current_used_slots <= ring->max_used_slots)
271 return;
272 ring->max_used_slots = current_used_slots;
273 if (b43legacy_debug(ring->dev, B43legacy_DBG_DMAVERBOSE))
274 b43legacydbg(ring->dev->wl,
275 "max_used_slots increased to %d on %s ring %d\n",
276 ring->max_used_slots,
277 ring->tx ? "TX" : "RX",
278 ring->index);
279 }
280 #else
281 static inline
282 void update_max_used_slots(struct b43legacy_dmaring *ring,
283 int current_used_slots)
284 { }
285 #endif /* DEBUG */
286
287 /* Request a slot for usage. */
288 static inline
289 int request_slot(struct b43legacy_dmaring *ring)
290 {
291 int slot;
292
293 B43legacy_WARN_ON(!ring->tx);
294 B43legacy_WARN_ON(ring->stopped);
295 B43legacy_WARN_ON(free_slots(ring) == 0);
296
297 slot = next_slot(ring, ring->current_slot);
298 ring->current_slot = slot;
299 ring->used_slots++;
300
301 update_max_used_slots(ring, ring->used_slots);
302
303 return slot;
304 }
305
306 /* Mac80211-queue to b43legacy-ring mapping */
307 static struct b43legacy_dmaring *priority_to_txring(
308 struct b43legacy_wldev *dev,
309 int queue_priority)
310 {
311 struct b43legacy_dmaring *ring;
312
313 /*FIXME: For now we always run on TX-ring-1 */
314 return dev->dma.tx_ring1;
315
316 /* 0 = highest priority */
317 switch (queue_priority) {
318 default:
319 B43legacy_WARN_ON(1);
320 /* fallthrough */
321 case 0:
322 ring = dev->dma.tx_ring3;
323 break;
324 case 1:
325 ring = dev->dma.tx_ring2;
326 break;
327 case 2:
328 ring = dev->dma.tx_ring1;
329 break;
330 case 3:
331 ring = dev->dma.tx_ring0;
332 break;
333 case 4:
334 ring = dev->dma.tx_ring4;
335 break;
336 case 5:
337 ring = dev->dma.tx_ring5;
338 break;
339 }
340
341 return ring;
342 }
343
344 /* Bcm4301-ring to mac80211-queue mapping */
345 static inline int txring_to_priority(struct b43legacy_dmaring *ring)
346 {
347 static const u8 idx_to_prio[] =
348 { 3, 2, 1, 0, 4, 5, };
349
350 /*FIXME: have only one queue, for now */
351 return 0;
352
353 return idx_to_prio[ring->index];
354 }
355
356
357 static u16 b43legacy_dmacontroller_base(enum b43legacy_dmatype type,
358 int controller_idx)
359 {
360 static const u16 map64[] = {
361 B43legacy_MMIO_DMA64_BASE0,
362 B43legacy_MMIO_DMA64_BASE1,
363 B43legacy_MMIO_DMA64_BASE2,
364 B43legacy_MMIO_DMA64_BASE3,
365 B43legacy_MMIO_DMA64_BASE4,
366 B43legacy_MMIO_DMA64_BASE5,
367 };
368 static const u16 map32[] = {
369 B43legacy_MMIO_DMA32_BASE0,
370 B43legacy_MMIO_DMA32_BASE1,
371 B43legacy_MMIO_DMA32_BASE2,
372 B43legacy_MMIO_DMA32_BASE3,
373 B43legacy_MMIO_DMA32_BASE4,
374 B43legacy_MMIO_DMA32_BASE5,
375 };
376
377 if (type == B43legacy_DMA_64BIT) {
378 B43legacy_WARN_ON(!(controller_idx >= 0 &&
379 controller_idx < ARRAY_SIZE(map64)));
380 return map64[controller_idx];
381 }
382 B43legacy_WARN_ON(!(controller_idx >= 0 &&
383 controller_idx < ARRAY_SIZE(map32)));
384 return map32[controller_idx];
385 }
386
387 static inline
388 dma_addr_t map_descbuffer(struct b43legacy_dmaring *ring,
389 unsigned char *buf,
390 size_t len,
391 int tx)
392 {
393 dma_addr_t dmaaddr;
394
395 if (tx)
396 dmaaddr = dma_map_single(ring->dev->dev->dma_dev,
397 buf, len,
398 DMA_TO_DEVICE);
399 else
400 dmaaddr = dma_map_single(ring->dev->dev->dma_dev,
401 buf, len,
402 DMA_FROM_DEVICE);
403
404 return dmaaddr;
405 }
406
407 static inline
408 void unmap_descbuffer(struct b43legacy_dmaring *ring,
409 dma_addr_t addr,
410 size_t len,
411 int tx)
412 {
413 if (tx)
414 dma_unmap_single(ring->dev->dev->dma_dev,
415 addr, len,
416 DMA_TO_DEVICE);
417 else
418 dma_unmap_single(ring->dev->dev->dma_dev,
419 addr, len,
420 DMA_FROM_DEVICE);
421 }
422
423 static inline
424 void sync_descbuffer_for_cpu(struct b43legacy_dmaring *ring,
425 dma_addr_t addr,
426 size_t len)
427 {
428 B43legacy_WARN_ON(ring->tx);
429
430 dma_sync_single_for_cpu(ring->dev->dev->dma_dev,
431 addr, len, DMA_FROM_DEVICE);
432 }
433
434 static inline
435 void sync_descbuffer_for_device(struct b43legacy_dmaring *ring,
436 dma_addr_t addr,
437 size_t len)
438 {
439 B43legacy_WARN_ON(ring->tx);
440
441 dma_sync_single_for_device(ring->dev->dev->dma_dev,
442 addr, len, DMA_FROM_DEVICE);
443 }
444
445 static inline
446 void free_descriptor_buffer(struct b43legacy_dmaring *ring,
447 struct b43legacy_dmadesc_meta *meta,
448 int irq_context)
449 {
450 if (meta->skb) {
451 if (irq_context)
452 dev_kfree_skb_irq(meta->skb);
453 else
454 dev_kfree_skb(meta->skb);
455 meta->skb = NULL;
456 }
457 }
458
459 static int alloc_ringmemory(struct b43legacy_dmaring *ring)
460 {
461 struct device *dma_dev = ring->dev->dev->dma_dev;
462
463 ring->descbase = dma_alloc_coherent(dma_dev, B43legacy_DMA_RINGMEMSIZE,
464 &(ring->dmabase), GFP_KERNEL);
465 if (!ring->descbase) {
466 b43legacyerr(ring->dev->wl, "DMA ringmemory allocation"
467 " failed\n");
468 return -ENOMEM;
469 }
470 memset(ring->descbase, 0, B43legacy_DMA_RINGMEMSIZE);
471
472 return 0;
473 }
474
475 static void free_ringmemory(struct b43legacy_dmaring *ring)
476 {
477 struct device *dma_dev = ring->dev->dev->dma_dev;
478
479 dma_free_coherent(dma_dev, B43legacy_DMA_RINGMEMSIZE,
480 ring->descbase, ring->dmabase);
481 }
482
483 /* Reset the RX DMA channel */
484 static int b43legacy_dmacontroller_rx_reset(struct b43legacy_wldev *dev,
485 u16 mmio_base,
486 enum b43legacy_dmatype type)
487 {
488 int i;
489 u32 value;
490 u16 offset;
491
492 might_sleep();
493
494 offset = (type == B43legacy_DMA_64BIT) ?
495 B43legacy_DMA64_RXCTL : B43legacy_DMA32_RXCTL;
496 b43legacy_write32(dev, mmio_base + offset, 0);
497 for (i = 0; i < 10; i++) {
498 offset = (type == B43legacy_DMA_64BIT) ?
499 B43legacy_DMA64_RXSTATUS : B43legacy_DMA32_RXSTATUS;
500 value = b43legacy_read32(dev, mmio_base + offset);
501 if (type == B43legacy_DMA_64BIT) {
502 value &= B43legacy_DMA64_RXSTAT;
503 if (value == B43legacy_DMA64_RXSTAT_DISABLED) {
504 i = -1;
505 break;
506 }
507 } else {
508 value &= B43legacy_DMA32_RXSTATE;
509 if (value == B43legacy_DMA32_RXSTAT_DISABLED) {
510 i = -1;
511 break;
512 }
513 }
514 msleep(1);
515 }
516 if (i != -1) {
517 b43legacyerr(dev->wl, "DMA RX reset timed out\n");
518 return -ENODEV;
519 }
520
521 return 0;
522 }
523
524 /* Reset the RX DMA channel */
525 static int b43legacy_dmacontroller_tx_reset(struct b43legacy_wldev *dev,
526 u16 mmio_base,
527 enum b43legacy_dmatype type)
528 {
529 int i;
530 u32 value;
531 u16 offset;
532
533 might_sleep();
534
535 for (i = 0; i < 10; i++) {
536 offset = (type == B43legacy_DMA_64BIT) ?
537 B43legacy_DMA64_TXSTATUS : B43legacy_DMA32_TXSTATUS;
538 value = b43legacy_read32(dev, mmio_base + offset);
539 if (type == B43legacy_DMA_64BIT) {
540 value &= B43legacy_DMA64_TXSTAT;
541 if (value == B43legacy_DMA64_TXSTAT_DISABLED ||
542 value == B43legacy_DMA64_TXSTAT_IDLEWAIT ||
543 value == B43legacy_DMA64_TXSTAT_STOPPED)
544 break;
545 } else {
546 value &= B43legacy_DMA32_TXSTATE;
547 if (value == B43legacy_DMA32_TXSTAT_DISABLED ||
548 value == B43legacy_DMA32_TXSTAT_IDLEWAIT ||
549 value == B43legacy_DMA32_TXSTAT_STOPPED)
550 break;
551 }
552 msleep(1);
553 }
554 offset = (type == B43legacy_DMA_64BIT) ? B43legacy_DMA64_TXCTL :
555 B43legacy_DMA32_TXCTL;
556 b43legacy_write32(dev, mmio_base + offset, 0);
557 for (i = 0; i < 10; i++) {
558 offset = (type == B43legacy_DMA_64BIT) ?
559 B43legacy_DMA64_TXSTATUS : B43legacy_DMA32_TXSTATUS;
560 value = b43legacy_read32(dev, mmio_base + offset);
561 if (type == B43legacy_DMA_64BIT) {
562 value &= B43legacy_DMA64_TXSTAT;
563 if (value == B43legacy_DMA64_TXSTAT_DISABLED) {
564 i = -1;
565 break;
566 }
567 } else {
568 value &= B43legacy_DMA32_TXSTATE;
569 if (value == B43legacy_DMA32_TXSTAT_DISABLED) {
570 i = -1;
571 break;
572 }
573 }
574 msleep(1);
575 }
576 if (i != -1) {
577 b43legacyerr(dev->wl, "DMA TX reset timed out\n");
578 return -ENODEV;
579 }
580 /* ensure the reset is completed. */
581 msleep(1);
582
583 return 0;
584 }
585
586 /* Check if a DMA mapping address is invalid. */
587 static bool b43legacy_dma_mapping_error(struct b43legacy_dmaring *ring,
588 dma_addr_t addr,
589 size_t buffersize,
590 bool dma_to_device)
591 {
592 if (unlikely(dma_mapping_error(addr)))
593 return 1;
594
595 switch (ring->type) {
596 case B43legacy_DMA_30BIT:
597 if ((u64)addr + buffersize > (1ULL << 30))
598 goto address_error;
599 break;
600 case B43legacy_DMA_32BIT:
601 if ((u64)addr + buffersize > (1ULL << 32))
602 goto address_error;
603 break;
604 case B43legacy_DMA_64BIT:
605 /* Currently we can't have addresses beyond 64 bits in the kernel. */
606 break;
607 }
608
609 /* The address is OK. */
610 return 0;
611
612 address_error:
613 /* We can't support this address. Unmap it again. */
614 unmap_descbuffer(ring, addr, buffersize, dma_to_device);
615
616 return 1;
617 }
618
619 static int setup_rx_descbuffer(struct b43legacy_dmaring *ring,
620 struct b43legacy_dmadesc_generic *desc,
621 struct b43legacy_dmadesc_meta *meta,
622 gfp_t gfp_flags)
623 {
624 struct b43legacy_rxhdr_fw3 *rxhdr;
625 struct b43legacy_hwtxstatus *txstat;
626 dma_addr_t dmaaddr;
627 struct sk_buff *skb;
628
629 B43legacy_WARN_ON(ring->tx);
630
631 skb = __dev_alloc_skb(ring->rx_buffersize, gfp_flags);
632 if (unlikely(!skb))
633 return -ENOMEM;
634 dmaaddr = map_descbuffer(ring, skb->data,
635 ring->rx_buffersize, 0);
636 if (b43legacy_dma_mapping_error(ring, dmaaddr, ring->rx_buffersize, 0)) {
637 /* ugh. try to realloc in zone_dma */
638 gfp_flags |= GFP_DMA;
639
640 dev_kfree_skb_any(skb);
641
642 skb = __dev_alloc_skb(ring->rx_buffersize, gfp_flags);
643 if (unlikely(!skb))
644 return -ENOMEM;
645 dmaaddr = map_descbuffer(ring, skb->data,
646 ring->rx_buffersize, 0);
647 }
648
649 if (b43legacy_dma_mapping_error(ring, dmaaddr, ring->rx_buffersize, 0)) {
650 dev_kfree_skb_any(skb);
651 return -EIO;
652 }
653
654 meta->skb = skb;
655 meta->dmaaddr = dmaaddr;
656 ring->ops->fill_descriptor(ring, desc, dmaaddr,
657 ring->rx_buffersize, 0, 0, 0);
658
659 rxhdr = (struct b43legacy_rxhdr_fw3 *)(skb->data);
660 rxhdr->frame_len = 0;
661 txstat = (struct b43legacy_hwtxstatus *)(skb->data);
662 txstat->cookie = 0;
663
664 return 0;
665 }
666
667 /* Allocate the initial descbuffers.
668 * This is used for an RX ring only.
669 */
670 static int alloc_initial_descbuffers(struct b43legacy_dmaring *ring)
671 {
672 int i;
673 int err = -ENOMEM;
674 struct b43legacy_dmadesc_generic *desc;
675 struct b43legacy_dmadesc_meta *meta;
676
677 for (i = 0; i < ring->nr_slots; i++) {
678 desc = ring->ops->idx2desc(ring, i, &meta);
679
680 err = setup_rx_descbuffer(ring, desc, meta, GFP_KERNEL);
681 if (err) {
682 b43legacyerr(ring->dev->wl,
683 "Failed to allocate initial descbuffers\n");
684 goto err_unwind;
685 }
686 }
687 mb(); /* all descbuffer setup before next line */
688 ring->used_slots = ring->nr_slots;
689 err = 0;
690 out:
691 return err;
692
693 err_unwind:
694 for (i--; i >= 0; i--) {
695 desc = ring->ops->idx2desc(ring, i, &meta);
696
697 unmap_descbuffer(ring, meta->dmaaddr, ring->rx_buffersize, 0);
698 dev_kfree_skb(meta->skb);
699 }
700 goto out;
701 }
702
703 /* Do initial setup of the DMA controller.
704 * Reset the controller, write the ring busaddress
705 * and switch the "enable" bit on.
706 */
707 static int dmacontroller_setup(struct b43legacy_dmaring *ring)
708 {
709 int err = 0;
710 u32 value;
711 u32 addrext;
712 u32 trans = ssb_dma_translation(ring->dev->dev);
713
714 if (ring->tx) {
715 if (ring->type == B43legacy_DMA_64BIT) {
716 u64 ringbase = (u64)(ring->dmabase);
717
718 addrext = ((ringbase >> 32) & SSB_DMA_TRANSLATION_MASK)
719 >> SSB_DMA_TRANSLATION_SHIFT;
720 value = B43legacy_DMA64_TXENABLE;
721 value |= (addrext << B43legacy_DMA64_TXADDREXT_SHIFT)
722 & B43legacy_DMA64_TXADDREXT_MASK;
723 b43legacy_dma_write(ring, B43legacy_DMA64_TXCTL,
724 value);
725 b43legacy_dma_write(ring, B43legacy_DMA64_TXRINGLO,
726 (ringbase & 0xFFFFFFFF));
727 b43legacy_dma_write(ring, B43legacy_DMA64_TXRINGHI,
728 ((ringbase >> 32)
729 & ~SSB_DMA_TRANSLATION_MASK)
730 | trans);
731 } else {
732 u32 ringbase = (u32)(ring->dmabase);
733
734 addrext = (ringbase & SSB_DMA_TRANSLATION_MASK)
735 >> SSB_DMA_TRANSLATION_SHIFT;
736 value = B43legacy_DMA32_TXENABLE;
737 value |= (addrext << B43legacy_DMA32_TXADDREXT_SHIFT)
738 & B43legacy_DMA32_TXADDREXT_MASK;
739 b43legacy_dma_write(ring, B43legacy_DMA32_TXCTL,
740 value);
741 b43legacy_dma_write(ring, B43legacy_DMA32_TXRING,
742 (ringbase &
743 ~SSB_DMA_TRANSLATION_MASK)
744 | trans);
745 }
746 } else {
747 err = alloc_initial_descbuffers(ring);
748 if (err)
749 goto out;
750 if (ring->type == B43legacy_DMA_64BIT) {
751 u64 ringbase = (u64)(ring->dmabase);
752
753 addrext = ((ringbase >> 32) & SSB_DMA_TRANSLATION_MASK)
754 >> SSB_DMA_TRANSLATION_SHIFT;
755 value = (ring->frameoffset <<
756 B43legacy_DMA64_RXFROFF_SHIFT);
757 value |= B43legacy_DMA64_RXENABLE;
758 value |= (addrext << B43legacy_DMA64_RXADDREXT_SHIFT)
759 & B43legacy_DMA64_RXADDREXT_MASK;
760 b43legacy_dma_write(ring, B43legacy_DMA64_RXCTL,
761 value);
762 b43legacy_dma_write(ring, B43legacy_DMA64_RXRINGLO,
763 (ringbase & 0xFFFFFFFF));
764 b43legacy_dma_write(ring, B43legacy_DMA64_RXRINGHI,
765 ((ringbase >> 32) &
766 ~SSB_DMA_TRANSLATION_MASK) |
767 trans);
768 b43legacy_dma_write(ring, B43legacy_DMA64_RXINDEX,
769 200);
770 } else {
771 u32 ringbase = (u32)(ring->dmabase);
772
773 addrext = (ringbase & SSB_DMA_TRANSLATION_MASK)
774 >> SSB_DMA_TRANSLATION_SHIFT;
775 value = (ring->frameoffset <<
776 B43legacy_DMA32_RXFROFF_SHIFT);
777 value |= B43legacy_DMA32_RXENABLE;
778 value |= (addrext <<
779 B43legacy_DMA32_RXADDREXT_SHIFT)
780 & B43legacy_DMA32_RXADDREXT_MASK;
781 b43legacy_dma_write(ring, B43legacy_DMA32_RXCTL,
782 value);
783 b43legacy_dma_write(ring, B43legacy_DMA32_RXRING,
784 (ringbase &
785 ~SSB_DMA_TRANSLATION_MASK)
786 | trans);
787 b43legacy_dma_write(ring, B43legacy_DMA32_RXINDEX,
788 200);
789 }
790 }
791
792 out:
793 return err;
794 }
795
796 /* Shutdown the DMA controller. */
797 static void dmacontroller_cleanup(struct b43legacy_dmaring *ring)
798 {
799 if (ring->tx) {
800 b43legacy_dmacontroller_tx_reset(ring->dev, ring->mmio_base,
801 ring->type);
802 if (ring->type == B43legacy_DMA_64BIT) {
803 b43legacy_dma_write(ring, B43legacy_DMA64_TXRINGLO, 0);
804 b43legacy_dma_write(ring, B43legacy_DMA64_TXRINGHI, 0);
805 } else
806 b43legacy_dma_write(ring, B43legacy_DMA32_TXRING, 0);
807 } else {
808 b43legacy_dmacontroller_rx_reset(ring->dev, ring->mmio_base,
809 ring->type);
810 if (ring->type == B43legacy_DMA_64BIT) {
811 b43legacy_dma_write(ring, B43legacy_DMA64_RXRINGLO, 0);
812 b43legacy_dma_write(ring, B43legacy_DMA64_RXRINGHI, 0);
813 } else
814 b43legacy_dma_write(ring, B43legacy_DMA32_RXRING, 0);
815 }
816 }
817
818 static void free_all_descbuffers(struct b43legacy_dmaring *ring)
819 {
820 struct b43legacy_dmadesc_generic *desc;
821 struct b43legacy_dmadesc_meta *meta;
822 int i;
823
824 if (!ring->used_slots)
825 return;
826 for (i = 0; i < ring->nr_slots; i++) {
827 desc = ring->ops->idx2desc(ring, i, &meta);
828
829 if (!meta->skb) {
830 B43legacy_WARN_ON(!ring->tx);
831 continue;
832 }
833 if (ring->tx)
834 unmap_descbuffer(ring, meta->dmaaddr,
835 meta->skb->len, 1);
836 else
837 unmap_descbuffer(ring, meta->dmaaddr,
838 ring->rx_buffersize, 0);
839 free_descriptor_buffer(ring, meta, 0);
840 }
841 }
842
843 static u64 supported_dma_mask(struct b43legacy_wldev *dev)
844 {
845 u32 tmp;
846 u16 mmio_base;
847
848 tmp = b43legacy_read32(dev, SSB_TMSHIGH);
849 if (tmp & SSB_TMSHIGH_DMA64)
850 return DMA_64BIT_MASK;
851 mmio_base = b43legacy_dmacontroller_base(0, 0);
852 b43legacy_write32(dev,
853 mmio_base + B43legacy_DMA32_TXCTL,
854 B43legacy_DMA32_TXADDREXT_MASK);
855 tmp = b43legacy_read32(dev, mmio_base +
856 B43legacy_DMA32_TXCTL);
857 if (tmp & B43legacy_DMA32_TXADDREXT_MASK)
858 return DMA_32BIT_MASK;
859
860 return DMA_30BIT_MASK;
861 }
862
863 /* Main initialization function. */
864 static
865 struct b43legacy_dmaring *b43legacy_setup_dmaring(struct b43legacy_wldev *dev,
866 int controller_index,
867 int for_tx,
868 enum b43legacy_dmatype type)
869 {
870 struct b43legacy_dmaring *ring;
871 int err;
872 int nr_slots;
873 dma_addr_t dma_test;
874
875 ring = kzalloc(sizeof(*ring), GFP_KERNEL);
876 if (!ring)
877 goto out;
878 ring->type = type;
879
880 nr_slots = B43legacy_RXRING_SLOTS;
881 if (for_tx)
882 nr_slots = B43legacy_TXRING_SLOTS;
883
884 ring->meta = kcalloc(nr_slots, sizeof(struct b43legacy_dmadesc_meta),
885 GFP_KERNEL);
886 if (!ring->meta)
887 goto err_kfree_ring;
888 if (for_tx) {
889 ring->txhdr_cache = kcalloc(nr_slots,
890 sizeof(struct b43legacy_txhdr_fw3),
891 GFP_KERNEL);
892 if (!ring->txhdr_cache)
893 goto err_kfree_meta;
894
895 /* test for ability to dma to txhdr_cache */
896 dma_test = dma_map_single(dev->dev->dma_dev, ring->txhdr_cache,
897 sizeof(struct b43legacy_txhdr_fw3),
898 DMA_TO_DEVICE);
899
900 if (b43legacy_dma_mapping_error(ring, dma_test,
901 sizeof(struct b43legacy_txhdr_fw3), 1)) {
902 /* ugh realloc */
903 kfree(ring->txhdr_cache);
904 ring->txhdr_cache = kcalloc(nr_slots,
905 sizeof(struct b43legacy_txhdr_fw3),
906 GFP_KERNEL | GFP_DMA);
907 if (!ring->txhdr_cache)
908 goto err_kfree_meta;
909
910 dma_test = dma_map_single(dev->dev->dma_dev,
911 ring->txhdr_cache,
912 sizeof(struct b43legacy_txhdr_fw3),
913 DMA_TO_DEVICE);
914
915 if (b43legacy_dma_mapping_error(ring, dma_test,
916 sizeof(struct b43legacy_txhdr_fw3), 1))
917 goto err_kfree_txhdr_cache;
918 }
919
920 dma_unmap_single(dev->dev->dma_dev,
921 dma_test, sizeof(struct b43legacy_txhdr_fw3),
922 DMA_TO_DEVICE);
923 }
924
925 ring->dev = dev;
926 ring->nr_slots = nr_slots;
927 ring->mmio_base = b43legacy_dmacontroller_base(type, controller_index);
928 ring->index = controller_index;
929 if (type == B43legacy_DMA_64BIT)
930 ring->ops = &dma64_ops;
931 else
932 ring->ops = &dma32_ops;
933 if (for_tx) {
934 ring->tx = 1;
935 ring->current_slot = -1;
936 } else {
937 if (ring->index == 0) {
938 ring->rx_buffersize = B43legacy_DMA0_RX_BUFFERSIZE;
939 ring->frameoffset = B43legacy_DMA0_RX_FRAMEOFFSET;
940 } else if (ring->index == 3) {
941 ring->rx_buffersize = B43legacy_DMA3_RX_BUFFERSIZE;
942 ring->frameoffset = B43legacy_DMA3_RX_FRAMEOFFSET;
943 } else
944 B43legacy_WARN_ON(1);
945 }
946 spin_lock_init(&ring->lock);
947 #ifdef CONFIG_B43LEGACY_DEBUG
948 ring->last_injected_overflow = jiffies;
949 #endif
950
951 err = alloc_ringmemory(ring);
952 if (err)
953 goto err_kfree_txhdr_cache;
954 err = dmacontroller_setup(ring);
955 if (err)
956 goto err_free_ringmemory;
957
958 out:
959 return ring;
960
961 err_free_ringmemory:
962 free_ringmemory(ring);
963 err_kfree_txhdr_cache:
964 kfree(ring->txhdr_cache);
965 err_kfree_meta:
966 kfree(ring->meta);
967 err_kfree_ring:
968 kfree(ring);
969 ring = NULL;
970 goto out;
971 }
972
973 /* Main cleanup function. */
974 static void b43legacy_destroy_dmaring(struct b43legacy_dmaring *ring)
975 {
976 if (!ring)
977 return;
978
979 b43legacydbg(ring->dev->wl, "DMA-%u 0x%04X (%s) max used slots:"
980 " %d/%d\n", (unsigned int)(ring->type), ring->mmio_base,
981 (ring->tx) ? "TX" : "RX", ring->max_used_slots,
982 ring->nr_slots);
983 /* Device IRQs are disabled prior entering this function,
984 * so no need to take care of concurrency with rx handler stuff.
985 */
986 dmacontroller_cleanup(ring);
987 free_all_descbuffers(ring);
988 free_ringmemory(ring);
989
990 kfree(ring->txhdr_cache);
991 kfree(ring->meta);
992 kfree(ring);
993 }
994
995 void b43legacy_dma_free(struct b43legacy_wldev *dev)
996 {
997 struct b43legacy_dma *dma;
998
999 if (b43legacy_using_pio(dev))
1000 return;
1001 dma = &dev->dma;
1002
1003 b43legacy_destroy_dmaring(dma->rx_ring3);
1004 dma->rx_ring3 = NULL;
1005 b43legacy_destroy_dmaring(dma->rx_ring0);
1006 dma->rx_ring0 = NULL;
1007
1008 b43legacy_destroy_dmaring(dma->tx_ring5);
1009 dma->tx_ring5 = NULL;
1010 b43legacy_destroy_dmaring(dma->tx_ring4);
1011 dma->tx_ring4 = NULL;
1012 b43legacy_destroy_dmaring(dma->tx_ring3);
1013 dma->tx_ring3 = NULL;
1014 b43legacy_destroy_dmaring(dma->tx_ring2);
1015 dma->tx_ring2 = NULL;
1016 b43legacy_destroy_dmaring(dma->tx_ring1);
1017 dma->tx_ring1 = NULL;
1018 b43legacy_destroy_dmaring(dma->tx_ring0);
1019 dma->tx_ring0 = NULL;
1020 }
1021
1022 int b43legacy_dma_init(struct b43legacy_wldev *dev)
1023 {
1024 struct b43legacy_dma *dma = &dev->dma;
1025 struct b43legacy_dmaring *ring;
1026 int err;
1027 u64 dmamask;
1028 enum b43legacy_dmatype type;
1029
1030 dmamask = supported_dma_mask(dev);
1031 switch (dmamask) {
1032 default:
1033 B43legacy_WARN_ON(1);
1034 case DMA_30BIT_MASK:
1035 type = B43legacy_DMA_30BIT;
1036 break;
1037 case DMA_32BIT_MASK:
1038 type = B43legacy_DMA_32BIT;
1039 break;
1040 case DMA_64BIT_MASK:
1041 type = B43legacy_DMA_64BIT;
1042 break;
1043 }
1044
1045 err = ssb_dma_set_mask(dev->dev, dmamask);
1046 if (err) {
1047 #ifdef CONFIG_B43LEGACY_PIO
1048 b43legacywarn(dev->wl, "DMA for this device not supported. "
1049 "Falling back to PIO\n");
1050 dev->__using_pio = 1;
1051 return -EAGAIN;
1052 #else
1053 b43legacyerr(dev->wl, "DMA for this device not supported and "
1054 "no PIO support compiled in\n");
1055 return -EOPNOTSUPP;
1056 #endif
1057 }
1058
1059 err = -ENOMEM;
1060 /* setup TX DMA channels. */
1061 ring = b43legacy_setup_dmaring(dev, 0, 1, type);
1062 if (!ring)
1063 goto out;
1064 dma->tx_ring0 = ring;
1065
1066 ring = b43legacy_setup_dmaring(dev, 1, 1, type);
1067 if (!ring)
1068 goto err_destroy_tx0;
1069 dma->tx_ring1 = ring;
1070
1071 ring = b43legacy_setup_dmaring(dev, 2, 1, type);
1072 if (!ring)
1073 goto err_destroy_tx1;
1074 dma->tx_ring2 = ring;
1075
1076 ring = b43legacy_setup_dmaring(dev, 3, 1, type);
1077 if (!ring)
1078 goto err_destroy_tx2;
1079 dma->tx_ring3 = ring;
1080
1081 ring = b43legacy_setup_dmaring(dev, 4, 1, type);
1082 if (!ring)
1083 goto err_destroy_tx3;
1084 dma->tx_ring4 = ring;
1085
1086 ring = b43legacy_setup_dmaring(dev, 5, 1, type);
1087 if (!ring)
1088 goto err_destroy_tx4;
1089 dma->tx_ring5 = ring;
1090
1091 /* setup RX DMA channels. */
1092 ring = b43legacy_setup_dmaring(dev, 0, 0, type);
1093 if (!ring)
1094 goto err_destroy_tx5;
1095 dma->rx_ring0 = ring;
1096
1097 if (dev->dev->id.revision < 5) {
1098 ring = b43legacy_setup_dmaring(dev, 3, 0, type);
1099 if (!ring)
1100 goto err_destroy_rx0;
1101 dma->rx_ring3 = ring;
1102 }
1103
1104 b43legacydbg(dev->wl, "%u-bit DMA initialized\n", (unsigned int)type);
1105 err = 0;
1106 out:
1107 return err;
1108
1109 err_destroy_rx0:
1110 b43legacy_destroy_dmaring(dma->rx_ring0);
1111 dma->rx_ring0 = NULL;
1112 err_destroy_tx5:
1113 b43legacy_destroy_dmaring(dma->tx_ring5);
1114 dma->tx_ring5 = NULL;
1115 err_destroy_tx4:
1116 b43legacy_destroy_dmaring(dma->tx_ring4);
1117 dma->tx_ring4 = NULL;
1118 err_destroy_tx3:
1119 b43legacy_destroy_dmaring(dma->tx_ring3);
1120 dma->tx_ring3 = NULL;
1121 err_destroy_tx2:
1122 b43legacy_destroy_dmaring(dma->tx_ring2);
1123 dma->tx_ring2 = NULL;
1124 err_destroy_tx1:
1125 b43legacy_destroy_dmaring(dma->tx_ring1);
1126 dma->tx_ring1 = NULL;
1127 err_destroy_tx0:
1128 b43legacy_destroy_dmaring(dma->tx_ring0);
1129 dma->tx_ring0 = NULL;
1130 goto out;
1131 }
1132
1133 /* Generate a cookie for the TX header. */
1134 static u16 generate_cookie(struct b43legacy_dmaring *ring,
1135 int slot)
1136 {
1137 u16 cookie = 0x1000;
1138
1139 /* Use the upper 4 bits of the cookie as
1140 * DMA controller ID and store the slot number
1141 * in the lower 12 bits.
1142 * Note that the cookie must never be 0, as this
1143 * is a special value used in RX path.
1144 */
1145 switch (ring->index) {
1146 case 0:
1147 cookie = 0xA000;
1148 break;
1149 case 1:
1150 cookie = 0xB000;
1151 break;
1152 case 2:
1153 cookie = 0xC000;
1154 break;
1155 case 3:
1156 cookie = 0xD000;
1157 break;
1158 case 4:
1159 cookie = 0xE000;
1160 break;
1161 case 5:
1162 cookie = 0xF000;
1163 break;
1164 }
1165 B43legacy_WARN_ON(!(((u16)slot & 0xF000) == 0x0000));
1166 cookie |= (u16)slot;
1167
1168 return cookie;
1169 }
1170
1171 /* Inspect a cookie and find out to which controller/slot it belongs. */
1172 static
1173 struct b43legacy_dmaring *parse_cookie(struct b43legacy_wldev *dev,
1174 u16 cookie, int *slot)
1175 {
1176 struct b43legacy_dma *dma = &dev->dma;
1177 struct b43legacy_dmaring *ring = NULL;
1178
1179 switch (cookie & 0xF000) {
1180 case 0xA000:
1181 ring = dma->tx_ring0;
1182 break;
1183 case 0xB000:
1184 ring = dma->tx_ring1;
1185 break;
1186 case 0xC000:
1187 ring = dma->tx_ring2;
1188 break;
1189 case 0xD000:
1190 ring = dma->tx_ring3;
1191 break;
1192 case 0xE000:
1193 ring = dma->tx_ring4;
1194 break;
1195 case 0xF000:
1196 ring = dma->tx_ring5;
1197 break;
1198 default:
1199 B43legacy_WARN_ON(1);
1200 }
1201 *slot = (cookie & 0x0FFF);
1202 B43legacy_WARN_ON(!(ring && *slot >= 0 && *slot < ring->nr_slots));
1203
1204 return ring;
1205 }
1206
1207 static int dma_tx_fragment(struct b43legacy_dmaring *ring,
1208 struct sk_buff *skb,
1209 struct ieee80211_tx_control *ctl)
1210 {
1211 const struct b43legacy_dma_ops *ops = ring->ops;
1212 u8 *header;
1213 int slot, old_top_slot, old_used_slots;
1214 int err;
1215 struct b43legacy_dmadesc_generic *desc;
1216 struct b43legacy_dmadesc_meta *meta;
1217 struct b43legacy_dmadesc_meta *meta_hdr;
1218 struct sk_buff *bounce_skb;
1219
1220 #define SLOTS_PER_PACKET 2
1221 B43legacy_WARN_ON(skb_shinfo(skb)->nr_frags != 0);
1222
1223 old_top_slot = ring->current_slot;
1224 old_used_slots = ring->used_slots;
1225
1226 /* Get a slot for the header. */
1227 slot = request_slot(ring);
1228 desc = ops->idx2desc(ring, slot, &meta_hdr);
1229 memset(meta_hdr, 0, sizeof(*meta_hdr));
1230
1231 header = &(ring->txhdr_cache[slot * sizeof(
1232 struct b43legacy_txhdr_fw3)]);
1233 err = b43legacy_generate_txhdr(ring->dev, header,
1234 skb->data, skb->len, ctl,
1235 generate_cookie(ring, slot));
1236 if (unlikely(err)) {
1237 ring->current_slot = old_top_slot;
1238 ring->used_slots = old_used_slots;
1239 return err;
1240 }
1241
1242 meta_hdr->dmaaddr = map_descbuffer(ring, (unsigned char *)header,
1243 sizeof(struct b43legacy_txhdr_fw3), 1);
1244 if (b43legacy_dma_mapping_error(ring, meta_hdr->dmaaddr,
1245 sizeof(struct b43legacy_txhdr_fw3), 1)) {
1246 ring->current_slot = old_top_slot;
1247 ring->used_slots = old_used_slots;
1248 return -EIO;
1249 }
1250 ops->fill_descriptor(ring, desc, meta_hdr->dmaaddr,
1251 sizeof(struct b43legacy_txhdr_fw3), 1, 0, 0);
1252
1253 /* Get a slot for the payload. */
1254 slot = request_slot(ring);
1255 desc = ops->idx2desc(ring, slot, &meta);
1256 memset(meta, 0, sizeof(*meta));
1257
1258 memcpy(&meta->txstat.control, ctl, sizeof(*ctl));
1259 meta->skb = skb;
1260 meta->is_last_fragment = 1;
1261
1262 meta->dmaaddr = map_descbuffer(ring, skb->data, skb->len, 1);
1263 /* create a bounce buffer in zone_dma on mapping failure. */
1264 if (b43legacy_dma_mapping_error(ring, meta->dmaaddr, skb->len, 1)) {
1265 bounce_skb = __dev_alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA);
1266 if (!bounce_skb) {
1267 ring->current_slot = old_top_slot;
1268 ring->used_slots = old_used_slots;
1269 err = -ENOMEM;
1270 goto out_unmap_hdr;
1271 }
1272
1273 memcpy(skb_put(bounce_skb, skb->len), skb->data, skb->len);
1274 dev_kfree_skb_any(skb);
1275 skb = bounce_skb;
1276 meta->skb = skb;
1277 meta->dmaaddr = map_descbuffer(ring, skb->data, skb->len, 1);
1278 if (b43legacy_dma_mapping_error(ring, meta->dmaaddr, skb->len, 1)) {
1279 ring->current_slot = old_top_slot;
1280 ring->used_slots = old_used_slots;
1281 err = -EIO;
1282 goto out_free_bounce;
1283 }
1284 }
1285
1286 ops->fill_descriptor(ring, desc, meta->dmaaddr,
1287 skb->len, 0, 1, 1);
1288
1289 wmb(); /* previous stuff MUST be done */
1290 /* Now transfer the whole frame. */
1291 ops->poke_tx(ring, next_slot(ring, slot));
1292 return 0;
1293
1294 out_free_bounce:
1295 dev_kfree_skb_any(skb);
1296 out_unmap_hdr:
1297 unmap_descbuffer(ring, meta_hdr->dmaaddr,
1298 sizeof(struct b43legacy_txhdr_fw3), 1);
1299 return err;
1300 }
1301
1302 static inline
1303 int should_inject_overflow(struct b43legacy_dmaring *ring)
1304 {
1305 #ifdef CONFIG_B43LEGACY_DEBUG
1306 if (unlikely(b43legacy_debug(ring->dev,
1307 B43legacy_DBG_DMAOVERFLOW))) {
1308 /* Check if we should inject another ringbuffer overflow
1309 * to test handling of this situation in the stack. */
1310 unsigned long next_overflow;
1311
1312 next_overflow = ring->last_injected_overflow + HZ;
1313 if (time_after(jiffies, next_overflow)) {
1314 ring->last_injected_overflow = jiffies;
1315 b43legacydbg(ring->dev->wl,
1316 "Injecting TX ring overflow on "
1317 "DMA controller %d\n", ring->index);
1318 return 1;
1319 }
1320 }
1321 #endif /* CONFIG_B43LEGACY_DEBUG */
1322 return 0;
1323 }
1324
1325 int b43legacy_dma_tx(struct b43legacy_wldev *dev,
1326 struct sk_buff *skb,
1327 struct ieee80211_tx_control *ctl)
1328 {
1329 struct b43legacy_dmaring *ring;
1330 int err = 0;
1331 unsigned long flags;
1332
1333 ring = priority_to_txring(dev, ctl->queue);
1334 spin_lock_irqsave(&ring->lock, flags);
1335 B43legacy_WARN_ON(!ring->tx);
1336 if (unlikely(free_slots(ring) < SLOTS_PER_PACKET)) {
1337 b43legacywarn(dev->wl, "DMA queue overflow\n");
1338 err = -ENOSPC;
1339 goto out_unlock;
1340 }
1341 /* Check if the queue was stopped in mac80211,
1342 * but we got called nevertheless.
1343 * That would be a mac80211 bug. */
1344 B43legacy_BUG_ON(ring->stopped);
1345
1346 err = dma_tx_fragment(ring, skb, ctl);
1347 if (unlikely(err == -ENOKEY)) {
1348 /* Drop this packet, as we don't have the encryption key
1349 * anymore and must not transmit it unencrypted. */
1350 dev_kfree_skb_any(skb);
1351 err = 0;
1352 goto out_unlock;
1353 }
1354 if (unlikely(err)) {
1355 b43legacyerr(dev->wl, "DMA tx mapping failure\n");
1356 goto out_unlock;
1357 }
1358 ring->nr_tx_packets++;
1359 if ((free_slots(ring) < SLOTS_PER_PACKET) ||
1360 should_inject_overflow(ring)) {
1361 /* This TX ring is full. */
1362 ieee80211_stop_queue(dev->wl->hw, txring_to_priority(ring));
1363 ring->stopped = 1;
1364 if (b43legacy_debug(dev, B43legacy_DBG_DMAVERBOSE))
1365 b43legacydbg(dev->wl, "Stopped TX ring %d\n",
1366 ring->index);
1367 }
1368 out_unlock:
1369 spin_unlock_irqrestore(&ring->lock, flags);
1370
1371 return err;
1372 }
1373
1374 void b43legacy_dma_handle_txstatus(struct b43legacy_wldev *dev,
1375 const struct b43legacy_txstatus *status)
1376 {
1377 const struct b43legacy_dma_ops *ops;
1378 struct b43legacy_dmaring *ring;
1379 struct b43legacy_dmadesc_generic *desc;
1380 struct b43legacy_dmadesc_meta *meta;
1381 int slot;
1382
1383 ring = parse_cookie(dev, status->cookie, &slot);
1384 if (unlikely(!ring))
1385 return;
1386 B43legacy_WARN_ON(!irqs_disabled());
1387 spin_lock(&ring->lock);
1388
1389 B43legacy_WARN_ON(!ring->tx);
1390 ops = ring->ops;
1391 while (1) {
1392 B43legacy_WARN_ON(!(slot >= 0 && slot < ring->nr_slots));
1393 desc = ops->idx2desc(ring, slot, &meta);
1394
1395 if (meta->skb)
1396 unmap_descbuffer(ring, meta->dmaaddr,
1397 meta->skb->len, 1);
1398 else
1399 unmap_descbuffer(ring, meta->dmaaddr,
1400 sizeof(struct b43legacy_txhdr_fw3),
1401 1);
1402
1403 if (meta->is_last_fragment) {
1404 B43legacy_WARN_ON(!meta->skb);
1405 /* Call back to inform the ieee80211 subsystem about the
1406 * status of the transmission.
1407 * Some fields of txstat are already filled in dma_tx().
1408 */
1409 if (status->acked) {
1410 meta->txstat.flags |= IEEE80211_TX_STATUS_ACK;
1411 } else {
1412 if (!(meta->txstat.control.flags
1413 & IEEE80211_TXCTL_NO_ACK))
1414 meta->txstat.excessive_retries = 1;
1415 }
1416 if (status->frame_count == 0) {
1417 /* The frame was not transmitted at all. */
1418 meta->txstat.retry_count = 0;
1419 } else
1420 meta->txstat.retry_count = status->frame_count
1421 - 1;
1422 ieee80211_tx_status_irqsafe(dev->wl->hw, meta->skb,
1423 &(meta->txstat));
1424 /* skb is freed by ieee80211_tx_status_irqsafe() */
1425 meta->skb = NULL;
1426 } else {
1427 /* No need to call free_descriptor_buffer here, as
1428 * this is only the txhdr, which is not allocated.
1429 */
1430 B43legacy_WARN_ON(meta->skb != NULL);
1431 }
1432
1433 /* Everything unmapped and free'd. So it's not used anymore. */
1434 ring->used_slots--;
1435
1436 if (meta->is_last_fragment)
1437 break;
1438 slot = next_slot(ring, slot);
1439 }
1440 dev->stats.last_tx = jiffies;
1441 if (ring->stopped) {
1442 B43legacy_WARN_ON(free_slots(ring) < SLOTS_PER_PACKET);
1443 ieee80211_wake_queue(dev->wl->hw, txring_to_priority(ring));
1444 ring->stopped = 0;
1445 if (b43legacy_debug(dev, B43legacy_DBG_DMAVERBOSE))
1446 b43legacydbg(dev->wl, "Woke up TX ring %d\n",
1447 ring->index);
1448 }
1449
1450 spin_unlock(&ring->lock);
1451 }
1452
1453 void b43legacy_dma_get_tx_stats(struct b43legacy_wldev *dev,
1454 struct ieee80211_tx_queue_stats *stats)
1455 {
1456 const int nr_queues = dev->wl->hw->queues;
1457 struct b43legacy_dmaring *ring;
1458 unsigned long flags;
1459 int i;
1460
1461 for (i = 0; i < nr_queues; i++) {
1462 ring = priority_to_txring(dev, i);
1463
1464 spin_lock_irqsave(&ring->lock, flags);
1465 stats[i].len = ring->used_slots / SLOTS_PER_PACKET;
1466 stats[i].limit = ring->nr_slots / SLOTS_PER_PACKET;
1467 stats[i].count = ring->nr_tx_packets;
1468 spin_unlock_irqrestore(&ring->lock, flags);
1469 }
1470 }
1471
1472 static void dma_rx(struct b43legacy_dmaring *ring,
1473 int *slot)
1474 {
1475 const struct b43legacy_dma_ops *ops = ring->ops;
1476 struct b43legacy_dmadesc_generic *desc;
1477 struct b43legacy_dmadesc_meta *meta;
1478 struct b43legacy_rxhdr_fw3 *rxhdr;
1479 struct sk_buff *skb;
1480 u16 len;
1481 int err;
1482 dma_addr_t dmaaddr;
1483
1484 desc = ops->idx2desc(ring, *slot, &meta);
1485
1486 sync_descbuffer_for_cpu(ring, meta->dmaaddr, ring->rx_buffersize);
1487 skb = meta->skb;
1488
1489 if (ring->index == 3) {
1490 /* We received an xmit status. */
1491 struct b43legacy_hwtxstatus *hw =
1492 (struct b43legacy_hwtxstatus *)skb->data;
1493 int i = 0;
1494
1495 while (hw->cookie == 0) {
1496 if (i > 100)
1497 break;
1498 i++;
1499 udelay(2);
1500 barrier();
1501 }
1502 b43legacy_handle_hwtxstatus(ring->dev, hw);
1503 /* recycle the descriptor buffer. */
1504 sync_descbuffer_for_device(ring, meta->dmaaddr,
1505 ring->rx_buffersize);
1506
1507 return;
1508 }
1509 rxhdr = (struct b43legacy_rxhdr_fw3 *)skb->data;
1510 len = le16_to_cpu(rxhdr->frame_len);
1511 if (len == 0) {
1512 int i = 0;
1513
1514 do {
1515 udelay(2);
1516 barrier();
1517 len = le16_to_cpu(rxhdr->frame_len);
1518 } while (len == 0 && i++ < 5);
1519 if (unlikely(len == 0)) {
1520 /* recycle the descriptor buffer. */
1521 sync_descbuffer_for_device(ring, meta->dmaaddr,
1522 ring->rx_buffersize);
1523 goto drop;
1524 }
1525 }
1526 if (unlikely(len > ring->rx_buffersize)) {
1527 /* The data did not fit into one descriptor buffer
1528 * and is split over multiple buffers.
1529 * This should never happen, as we try to allocate buffers
1530 * big enough. So simply ignore this packet.
1531 */
1532 int cnt = 0;
1533 s32 tmp = len;
1534
1535 while (1) {
1536 desc = ops->idx2desc(ring, *slot, &meta);
1537 /* recycle the descriptor buffer. */
1538 sync_descbuffer_for_device(ring, meta->dmaaddr,
1539 ring->rx_buffersize);
1540 *slot = next_slot(ring, *slot);
1541 cnt++;
1542 tmp -= ring->rx_buffersize;
1543 if (tmp <= 0)
1544 break;
1545 }
1546 b43legacyerr(ring->dev->wl, "DMA RX buffer too small "
1547 "(len: %u, buffer: %u, nr-dropped: %d)\n",
1548 len, ring->rx_buffersize, cnt);
1549 goto drop;
1550 }
1551
1552 dmaaddr = meta->dmaaddr;
1553 err = setup_rx_descbuffer(ring, desc, meta, GFP_ATOMIC);
1554 if (unlikely(err)) {
1555 b43legacydbg(ring->dev->wl, "DMA RX: setup_rx_descbuffer()"
1556 " failed\n");
1557 sync_descbuffer_for_device(ring, dmaaddr,
1558 ring->rx_buffersize);
1559 goto drop;
1560 }
1561
1562 unmap_descbuffer(ring, dmaaddr, ring->rx_buffersize, 0);
1563 skb_put(skb, len + ring->frameoffset);
1564 skb_pull(skb, ring->frameoffset);
1565
1566 b43legacy_rx(ring->dev, skb, rxhdr);
1567 drop:
1568 return;
1569 }
1570
1571 void b43legacy_dma_rx(struct b43legacy_dmaring *ring)
1572 {
1573 const struct b43legacy_dma_ops *ops = ring->ops;
1574 int slot;
1575 int current_slot;
1576 int used_slots = 0;
1577
1578 B43legacy_WARN_ON(ring->tx);
1579 current_slot = ops->get_current_rxslot(ring);
1580 B43legacy_WARN_ON(!(current_slot >= 0 && current_slot <
1581 ring->nr_slots));
1582
1583 slot = ring->current_slot;
1584 for (; slot != current_slot; slot = next_slot(ring, slot)) {
1585 dma_rx(ring, &slot);
1586 update_max_used_slots(ring, ++used_slots);
1587 }
1588 ops->set_current_rxslot(ring, slot);
1589 ring->current_slot = slot;
1590 }
1591
1592 static void b43legacy_dma_tx_suspend_ring(struct b43legacy_dmaring *ring)
1593 {
1594 unsigned long flags;
1595
1596 spin_lock_irqsave(&ring->lock, flags);
1597 B43legacy_WARN_ON(!ring->tx);
1598 ring->ops->tx_suspend(ring);
1599 spin_unlock_irqrestore(&ring->lock, flags);
1600 }
1601
1602 static void b43legacy_dma_tx_resume_ring(struct b43legacy_dmaring *ring)
1603 {
1604 unsigned long flags;
1605
1606 spin_lock_irqsave(&ring->lock, flags);
1607 B43legacy_WARN_ON(!ring->tx);
1608 ring->ops->tx_resume(ring);
1609 spin_unlock_irqrestore(&ring->lock, flags);
1610 }
1611
1612 void b43legacy_dma_tx_suspend(struct b43legacy_wldev *dev)
1613 {
1614 b43legacy_power_saving_ctl_bits(dev, -1, 1);
1615 b43legacy_dma_tx_suspend_ring(dev->dma.tx_ring0);
1616 b43legacy_dma_tx_suspend_ring(dev->dma.tx_ring1);
1617 b43legacy_dma_tx_suspend_ring(dev->dma.tx_ring2);
1618 b43legacy_dma_tx_suspend_ring(dev->dma.tx_ring3);
1619 b43legacy_dma_tx_suspend_ring(dev->dma.tx_ring4);
1620 b43legacy_dma_tx_suspend_ring(dev->dma.tx_ring5);
1621 }
1622
1623 void b43legacy_dma_tx_resume(struct b43legacy_wldev *dev)
1624 {
1625 b43legacy_dma_tx_resume_ring(dev->dma.tx_ring5);
1626 b43legacy_dma_tx_resume_ring(dev->dma.tx_ring4);
1627 b43legacy_dma_tx_resume_ring(dev->dma.tx_ring3);
1628 b43legacy_dma_tx_resume_ring(dev->dma.tx_ring2);
1629 b43legacy_dma_tx_resume_ring(dev->dma.tx_ring1);
1630 b43legacy_dma_tx_resume_ring(dev->dma.tx_ring0);
1631 b43legacy_power_saving_ctl_bits(dev, -1, -1);
1632 }
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