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proc: use seq_puts()/seq_putc() where possible
[linux-2.6/next.git] / drivers / net / wireless / b43legacy / dma.c
blobe03e01d0bc355bd5a72d282b62dd39526f0cbdad
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 <linux/slab.h>
41 #include <net/dst.h>
42
43 /* 32bit DMA ops. */
44 static
45 struct b43legacy_dmadesc_generic *op32_idx2desc(
46 struct b43legacy_dmaring *ring,
47 int slot,
48 struct b43legacy_dmadesc_meta **meta)
49 {
50 struct b43legacy_dmadesc32 *desc;
51
52 *meta = &(ring->meta[slot]);
53 desc = ring->descbase;
54 desc = &(desc[slot]);
55
56 return (struct b43legacy_dmadesc_generic *)desc;
57 }
58
59 static void op32_fill_descriptor(struct b43legacy_dmaring *ring,
60 struct b43legacy_dmadesc_generic *desc,
61 dma_addr_t dmaaddr, u16 bufsize,
62 int start, int end, int irq)
63 {
64 struct b43legacy_dmadesc32 *descbase = ring->descbase;
65 int slot;
66 u32 ctl;
67 u32 addr;
68 u32 addrext;
69
70 slot = (int)(&(desc->dma32) - descbase);
71 B43legacy_WARN_ON(!(slot >= 0 && slot < ring->nr_slots));
72
73 addr = (u32)(dmaaddr & ~SSB_DMA_TRANSLATION_MASK);
74 addrext = (u32)(dmaaddr & SSB_DMA_TRANSLATION_MASK)
75 >> SSB_DMA_TRANSLATION_SHIFT;
76 addr |= ssb_dma_translation(ring->dev->dev);
77 ctl = (bufsize - ring->frameoffset)
78 & B43legacy_DMA32_DCTL_BYTECNT;
79 if (slot == ring->nr_slots - 1)
80 ctl |= B43legacy_DMA32_DCTL_DTABLEEND;
81 if (start)
82 ctl |= B43legacy_DMA32_DCTL_FRAMESTART;
83 if (end)
84 ctl |= B43legacy_DMA32_DCTL_FRAMEEND;
85 if (irq)
86 ctl |= B43legacy_DMA32_DCTL_IRQ;
87 ctl |= (addrext << B43legacy_DMA32_DCTL_ADDREXT_SHIFT)
88 & B43legacy_DMA32_DCTL_ADDREXT_MASK;
89
90 desc->dma32.control = cpu_to_le32(ctl);
91 desc->dma32.address = cpu_to_le32(addr);
92 }
93
94 static void op32_poke_tx(struct b43legacy_dmaring *ring, int slot)
95 {
96 b43legacy_dma_write(ring, B43legacy_DMA32_TXINDEX,
97 (u32)(slot * sizeof(struct b43legacy_dmadesc32)));
98 }
99
100 static void op32_tx_suspend(struct b43legacy_dmaring *ring)
101 {
102 b43legacy_dma_write(ring, B43legacy_DMA32_TXCTL,
103 b43legacy_dma_read(ring, B43legacy_DMA32_TXCTL)
104 | B43legacy_DMA32_TXSUSPEND);
105 }
106
107 static void op32_tx_resume(struct b43legacy_dmaring *ring)
108 {
109 b43legacy_dma_write(ring, B43legacy_DMA32_TXCTL,
110 b43legacy_dma_read(ring, B43legacy_DMA32_TXCTL)
111 & ~B43legacy_DMA32_TXSUSPEND);
112 }
113
114 static int op32_get_current_rxslot(struct b43legacy_dmaring *ring)
115 {
116 u32 val;
117
118 val = b43legacy_dma_read(ring, B43legacy_DMA32_RXSTATUS);
119 val &= B43legacy_DMA32_RXDPTR;
120
121 return (val / sizeof(struct b43legacy_dmadesc32));
122 }
123
124 static void op32_set_current_rxslot(struct b43legacy_dmaring *ring,
125 int slot)
126 {
127 b43legacy_dma_write(ring, B43legacy_DMA32_RXINDEX,
128 (u32)(slot * sizeof(struct b43legacy_dmadesc32)));
129 }
130
131 static const struct b43legacy_dma_ops dma32_ops = {
132 .idx2desc = op32_idx2desc,
133 .fill_descriptor = op32_fill_descriptor,
134 .poke_tx = op32_poke_tx,
135 .tx_suspend = op32_tx_suspend,
136 .tx_resume = op32_tx_resume,
137 .get_current_rxslot = op32_get_current_rxslot,
138 .set_current_rxslot = op32_set_current_rxslot,
139 };
140
141 /* 64bit DMA ops. */
142 static
143 struct b43legacy_dmadesc_generic *op64_idx2desc(
144 struct b43legacy_dmaring *ring,
145 int slot,
146 struct b43legacy_dmadesc_meta
147 **meta)
148 {
149 struct b43legacy_dmadesc64 *desc;
150
151 *meta = &(ring->meta[slot]);
152 desc = ring->descbase;
153 desc = &(desc[slot]);
154
155 return (struct b43legacy_dmadesc_generic *)desc;
156 }
157
158 static void op64_fill_descriptor(struct b43legacy_dmaring *ring,
159 struct b43legacy_dmadesc_generic *desc,
160 dma_addr_t dmaaddr, u16 bufsize,
161 int start, int end, int irq)
162 {
163 struct b43legacy_dmadesc64 *descbase = ring->descbase;
164 int slot;
165 u32 ctl0 = 0;
166 u32 ctl1 = 0;
167 u32 addrlo;
168 u32 addrhi;
169 u32 addrext;
170
171 slot = (int)(&(desc->dma64) - descbase);
172 B43legacy_WARN_ON(!(slot >= 0 && slot < ring->nr_slots));
173
174 addrlo = (u32)(dmaaddr & 0xFFFFFFFF);
175 addrhi = (((u64)dmaaddr >> 32) & ~SSB_DMA_TRANSLATION_MASK);
176 addrext = (((u64)dmaaddr >> 32) & SSB_DMA_TRANSLATION_MASK)
177 >> SSB_DMA_TRANSLATION_SHIFT;
178 addrhi |= ssb_dma_translation(ring->dev->dev);
179 if (slot == ring->nr_slots - 1)
180 ctl0 |= B43legacy_DMA64_DCTL0_DTABLEEND;
181 if (start)
182 ctl0 |= B43legacy_DMA64_DCTL0_FRAMESTART;
183 if (end)
184 ctl0 |= B43legacy_DMA64_DCTL0_FRAMEEND;
185 if (irq)
186 ctl0 |= B43legacy_DMA64_DCTL0_IRQ;
187 ctl1 |= (bufsize - ring->frameoffset)
188 & B43legacy_DMA64_DCTL1_BYTECNT;
189 ctl1 |= (addrext << B43legacy_DMA64_DCTL1_ADDREXT_SHIFT)
190 & B43legacy_DMA64_DCTL1_ADDREXT_MASK;
191
192 desc->dma64.control0 = cpu_to_le32(ctl0);
193 desc->dma64.control1 = cpu_to_le32(ctl1);
194 desc->dma64.address_low = cpu_to_le32(addrlo);
195 desc->dma64.address_high = cpu_to_le32(addrhi);
196 }
197
198 static void op64_poke_tx(struct b43legacy_dmaring *ring, int slot)
199 {
200 b43legacy_dma_write(ring, B43legacy_DMA64_TXINDEX,
201 (u32)(slot * sizeof(struct b43legacy_dmadesc64)));
202 }
203
204 static void op64_tx_suspend(struct b43legacy_dmaring *ring)
205 {
206 b43legacy_dma_write(ring, B43legacy_DMA64_TXCTL,
207 b43legacy_dma_read(ring, B43legacy_DMA64_TXCTL)
208 | B43legacy_DMA64_TXSUSPEND);
209 }
210
211 static void op64_tx_resume(struct b43legacy_dmaring *ring)
212 {
213 b43legacy_dma_write(ring, B43legacy_DMA64_TXCTL,
214 b43legacy_dma_read(ring, B43legacy_DMA64_TXCTL)
215 & ~B43legacy_DMA64_TXSUSPEND);
216 }
217
218 static int op64_get_current_rxslot(struct b43legacy_dmaring *ring)
219 {
220 u32 val;
221
222 val = b43legacy_dma_read(ring, B43legacy_DMA64_RXSTATUS);
223 val &= B43legacy_DMA64_RXSTATDPTR;
224
225 return (val / sizeof(struct b43legacy_dmadesc64));
226 }
227
228 static void op64_set_current_rxslot(struct b43legacy_dmaring *ring,
229 int slot)
230 {
231 b43legacy_dma_write(ring, B43legacy_DMA64_RXINDEX,
232 (u32)(slot * sizeof(struct b43legacy_dmadesc64)));
233 }
234
235 static const struct b43legacy_dma_ops dma64_ops = {
236 .idx2desc = op64_idx2desc,
237 .fill_descriptor = op64_fill_descriptor,
238 .poke_tx = op64_poke_tx,
239 .tx_suspend = op64_tx_suspend,
240 .tx_resume = op64_tx_resume,
241 .get_current_rxslot = op64_get_current_rxslot,
242 .set_current_rxslot = op64_set_current_rxslot,
243 };
244
245
246 static inline int free_slots(struct b43legacy_dmaring *ring)
247 {
248 return (ring->nr_slots - ring->used_slots);
249 }
250
251 static inline int next_slot(struct b43legacy_dmaring *ring, int slot)
252 {
253 B43legacy_WARN_ON(!(slot >= -1 && slot <= ring->nr_slots - 1));
254 if (slot == ring->nr_slots - 1)
255 return 0;
256 return slot + 1;
257 }
258
259 static inline int prev_slot(struct b43legacy_dmaring *ring, int slot)
260 {
261 B43legacy_WARN_ON(!(slot >= 0 && slot <= ring->nr_slots - 1));
262 if (slot == 0)
263 return ring->nr_slots - 1;
264 return slot - 1;
265 }
266
267 #ifdef CONFIG_B43LEGACY_DEBUG
268 static void update_max_used_slots(struct b43legacy_dmaring *ring,
269 int current_used_slots)
270 {
271 if (current_used_slots <= ring->max_used_slots)
272 return;
273 ring->max_used_slots = current_used_slots;
274 if (b43legacy_debug(ring->dev, B43legacy_DBG_DMAVERBOSE))
275 b43legacydbg(ring->dev->wl,
276 "max_used_slots increased to %d on %s ring %d\n",
277 ring->max_used_slots,
278 ring->tx ? "TX" : "RX",
279 ring->index);
280 }
281 #else
282 static inline
283 void update_max_used_slots(struct b43legacy_dmaring *ring,
284 int current_used_slots)
285 { }
286 #endif /* DEBUG */
287
288 /* Request a slot for usage. */
289 static inline
290 int request_slot(struct b43legacy_dmaring *ring)
291 {
292 int slot;
293
294 B43legacy_WARN_ON(!ring->tx);
295 B43legacy_WARN_ON(ring->stopped);
296 B43legacy_WARN_ON(free_slots(ring) == 0);
297
298 slot = next_slot(ring, ring->current_slot);
299 ring->current_slot = slot;
300 ring->used_slots++;
301
302 update_max_used_slots(ring, ring->used_slots);
303
304 return slot;
305 }
306
307 /* Mac80211-queue to b43legacy-ring mapping */
308 static struct b43legacy_dmaring *priority_to_txring(
309 struct b43legacy_wldev *dev,
310 int queue_priority)
311 {
312 struct b43legacy_dmaring *ring;
313
314 /*FIXME: For now we always run on TX-ring-1 */
315 return dev->dma.tx_ring1;
316
317 /* 0 = highest priority */
318 switch (queue_priority) {
319 default:
320 B43legacy_WARN_ON(1);
321 /* fallthrough */
322 case 0:
323 ring = dev->dma.tx_ring3;
324 break;
325 case 1:
326 ring = dev->dma.tx_ring2;
327 break;
328 case 2:
329 ring = dev->dma.tx_ring1;
330 break;
331 case 3:
332 ring = dev->dma.tx_ring0;
333 break;
334 case 4:
335 ring = dev->dma.tx_ring4;
336 break;
337 case 5:
338 ring = dev->dma.tx_ring5;
339 break;
340 }
341
342 return ring;
343 }
344
345 /* Bcm4301-ring to mac80211-queue mapping */
346 static inline int txring_to_priority(struct b43legacy_dmaring *ring)
347 {
348 static const u8 idx_to_prio[] =
349 { 3, 2, 1, 0, 4, 5, };
350
351 /*FIXME: have only one queue, for now */
352 return 0;
353
354 return idx_to_prio[ring->index];
355 }
356
357
358 static u16 b43legacy_dmacontroller_base(enum b43legacy_dmatype type,
359 int controller_idx)
360 {
361 static const u16 map64[] = {
362 B43legacy_MMIO_DMA64_BASE0,
363 B43legacy_MMIO_DMA64_BASE1,
364 B43legacy_MMIO_DMA64_BASE2,
365 B43legacy_MMIO_DMA64_BASE3,
366 B43legacy_MMIO_DMA64_BASE4,
367 B43legacy_MMIO_DMA64_BASE5,
368 };
369 static const u16 map32[] = {
370 B43legacy_MMIO_DMA32_BASE0,
371 B43legacy_MMIO_DMA32_BASE1,
372 B43legacy_MMIO_DMA32_BASE2,
373 B43legacy_MMIO_DMA32_BASE3,
374 B43legacy_MMIO_DMA32_BASE4,
375 B43legacy_MMIO_DMA32_BASE5,
376 };
377
378 if (type == B43legacy_DMA_64BIT) {
379 B43legacy_WARN_ON(!(controller_idx >= 0 &&
380 controller_idx < ARRAY_SIZE(map64)));
381 return map64[controller_idx];
382 }
383 B43legacy_WARN_ON(!(controller_idx >= 0 &&
384 controller_idx < ARRAY_SIZE(map32)));
385 return map32[controller_idx];
386 }
387
388 static inline
389 dma_addr_t map_descbuffer(struct b43legacy_dmaring *ring,
390 unsigned char *buf,
391 size_t len,
392 int tx)
393 {
394 dma_addr_t dmaaddr;
395
396 if (tx)
397 dmaaddr = dma_map_single(ring->dev->dev->dma_dev,
398 buf, len,
399 DMA_TO_DEVICE);
400 else
401 dmaaddr = dma_map_single(ring->dev->dev->dma_dev,
402 buf, len,
403 DMA_FROM_DEVICE);
404
405 return dmaaddr;
406 }
407
408 static inline
409 void unmap_descbuffer(struct b43legacy_dmaring *ring,
410 dma_addr_t addr,
411 size_t len,
412 int tx)
413 {
414 if (tx)
415 dma_unmap_single(ring->dev->dev->dma_dev,
416 addr, len,
417 DMA_TO_DEVICE);
418 else
419 dma_unmap_single(ring->dev->dev->dma_dev,
420 addr, len,
421 DMA_FROM_DEVICE);
422 }
423
424 static inline
425 void sync_descbuffer_for_cpu(struct b43legacy_dmaring *ring,
426 dma_addr_t addr,
427 size_t len)
428 {
429 B43legacy_WARN_ON(ring->tx);
430
431 dma_sync_single_for_cpu(ring->dev->dev->dma_dev,
432 addr, len, DMA_FROM_DEVICE);
433 }
434
435 static inline
436 void sync_descbuffer_for_device(struct b43legacy_dmaring *ring,
437 dma_addr_t addr,
438 size_t len)
439 {
440 B43legacy_WARN_ON(ring->tx);
441
442 dma_sync_single_for_device(ring->dev->dev->dma_dev,
443 addr, len, DMA_FROM_DEVICE);
444 }
445
446 static inline
447 void free_descriptor_buffer(struct b43legacy_dmaring *ring,
448 struct b43legacy_dmadesc_meta *meta,
449 int irq_context)
450 {
451 if (meta->skb) {
452 if (irq_context)
453 dev_kfree_skb_irq(meta->skb);
454 else
455 dev_kfree_skb(meta->skb);
456 meta->skb = NULL;
457 }
458 }
459
460 static int alloc_ringmemory(struct b43legacy_dmaring *ring)
461 {
462 /* GFP flags must match the flags in free_ringmemory()! */
463 ring->descbase = dma_alloc_coherent(ring->dev->dev->dma_dev,
464 B43legacy_DMA_RINGMEMSIZE,
465 &(ring->dmabase),
466 GFP_KERNEL);
467 if (!ring->descbase) {
468 b43legacyerr(ring->dev->wl, "DMA ringmemory allocation"
469 " failed\n");
470 return -ENOMEM;
471 }
472 memset(ring->descbase, 0, B43legacy_DMA_RINGMEMSIZE);
473
474 return 0;
475 }
476
477 static void free_ringmemory(struct b43legacy_dmaring *ring)
478 {
479 dma_free_coherent(ring->dev->dev->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(ring->dev->dev->dma_dev, 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_BIT_MASK(64);
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_BIT_MASK(32);
859
860 return DMA_BIT_MASK(30);
861 }
862
863 static enum b43legacy_dmatype dma_mask_to_engine_type(u64 dmamask)
864 {
865 if (dmamask == DMA_BIT_MASK(30))
866 return B43legacy_DMA_30BIT;
867 if (dmamask == DMA_BIT_MASK(32))
868 return B43legacy_DMA_32BIT;
869 if (dmamask == DMA_BIT_MASK(64))
870 return B43legacy_DMA_64BIT;
871 B43legacy_WARN_ON(1);
872 return B43legacy_DMA_30BIT;
873 }
874
875 /* Main initialization function. */
876 static
877 struct b43legacy_dmaring *b43legacy_setup_dmaring(struct b43legacy_wldev *dev,
878 int controller_index,
879 int for_tx,
880 enum b43legacy_dmatype type)
881 {
882 struct b43legacy_dmaring *ring;
883 int err;
884 int nr_slots;
885 dma_addr_t dma_test;
886
887 ring = kzalloc(sizeof(*ring), GFP_KERNEL);
888 if (!ring)
889 goto out;
890 ring->type = type;
891 ring->dev = dev;
892
893 nr_slots = B43legacy_RXRING_SLOTS;
894 if (for_tx)
895 nr_slots = B43legacy_TXRING_SLOTS;
896
897 ring->meta = kcalloc(nr_slots, sizeof(struct b43legacy_dmadesc_meta),
898 GFP_KERNEL);
899 if (!ring->meta)
900 goto err_kfree_ring;
901 if (for_tx) {
902 ring->txhdr_cache = kcalloc(nr_slots,
903 sizeof(struct b43legacy_txhdr_fw3),
904 GFP_KERNEL);
905 if (!ring->txhdr_cache)
906 goto err_kfree_meta;
907
908 /* test for ability to dma to txhdr_cache */
909 dma_test = dma_map_single(dev->dev->dma_dev, ring->txhdr_cache,
910 sizeof(struct b43legacy_txhdr_fw3),
911 DMA_TO_DEVICE);
912
913 if (b43legacy_dma_mapping_error(ring, dma_test,
914 sizeof(struct b43legacy_txhdr_fw3), 1)) {
915 /* ugh realloc */
916 kfree(ring->txhdr_cache);
917 ring->txhdr_cache = kcalloc(nr_slots,
918 sizeof(struct b43legacy_txhdr_fw3),
919 GFP_KERNEL | GFP_DMA);
920 if (!ring->txhdr_cache)
921 goto err_kfree_meta;
922
923 dma_test = dma_map_single(dev->dev->dma_dev,
924 ring->txhdr_cache,
925 sizeof(struct b43legacy_txhdr_fw3),
926 DMA_TO_DEVICE);
927
928 if (b43legacy_dma_mapping_error(ring, dma_test,
929 sizeof(struct b43legacy_txhdr_fw3), 1))
930 goto err_kfree_txhdr_cache;
931 }
932
933 dma_unmap_single(dev->dev->dma_dev, dma_test,
934 sizeof(struct b43legacy_txhdr_fw3),
935 DMA_TO_DEVICE);
936 }
937
938 ring->nr_slots = nr_slots;
939 ring->mmio_base = b43legacy_dmacontroller_base(type, controller_index);
940 ring->index = controller_index;
941 if (type == B43legacy_DMA_64BIT)
942 ring->ops = &dma64_ops;
943 else
944 ring->ops = &dma32_ops;
945 if (for_tx) {
946 ring->tx = 1;
947 ring->current_slot = -1;
948 } else {
949 if (ring->index == 0) {
950 ring->rx_buffersize = B43legacy_DMA0_RX_BUFFERSIZE;
951 ring->frameoffset = B43legacy_DMA0_RX_FRAMEOFFSET;
952 } else if (ring->index == 3) {
953 ring->rx_buffersize = B43legacy_DMA3_RX_BUFFERSIZE;
954 ring->frameoffset = B43legacy_DMA3_RX_FRAMEOFFSET;
955 } else
956 B43legacy_WARN_ON(1);
957 }
958 spin_lock_init(&ring->lock);
959 #ifdef CONFIG_B43LEGACY_DEBUG
960 ring->last_injected_overflow = jiffies;
961 #endif
962
963 err = alloc_ringmemory(ring);
964 if (err)
965 goto err_kfree_txhdr_cache;
966 err = dmacontroller_setup(ring);
967 if (err)
968 goto err_free_ringmemory;
969
970 out:
971 return ring;
972
973 err_free_ringmemory:
974 free_ringmemory(ring);
975 err_kfree_txhdr_cache:
976 kfree(ring->txhdr_cache);
977 err_kfree_meta:
978 kfree(ring->meta);
979 err_kfree_ring:
980 kfree(ring);
981 ring = NULL;
982 goto out;
983 }
984
985 /* Main cleanup function. */
986 static void b43legacy_destroy_dmaring(struct b43legacy_dmaring *ring)
987 {
988 if (!ring)
989 return;
990
991 b43legacydbg(ring->dev->wl, "DMA-%u 0x%04X (%s) max used slots:"
992 " %d/%d\n", (unsigned int)(ring->type), ring->mmio_base,
993 (ring->tx) ? "TX" : "RX", ring->max_used_slots,
994 ring->nr_slots);
995 /* Device IRQs are disabled prior entering this function,
996 * so no need to take care of concurrency with rx handler stuff.
997 */
998 dmacontroller_cleanup(ring);
999 free_all_descbuffers(ring);
1000 free_ringmemory(ring);
1001
1002 kfree(ring->txhdr_cache);
1003 kfree(ring->meta);
1004 kfree(ring);
1005 }
1006
1007 void b43legacy_dma_free(struct b43legacy_wldev *dev)
1008 {
1009 struct b43legacy_dma *dma;
1010
1011 if (b43legacy_using_pio(dev))
1012 return;
1013 dma = &dev->dma;
1014
1015 b43legacy_destroy_dmaring(dma->rx_ring3);
1016 dma->rx_ring3 = NULL;
1017 b43legacy_destroy_dmaring(dma->rx_ring0);
1018 dma->rx_ring0 = NULL;
1019
1020 b43legacy_destroy_dmaring(dma->tx_ring5);
1021 dma->tx_ring5 = NULL;
1022 b43legacy_destroy_dmaring(dma->tx_ring4);
1023 dma->tx_ring4 = NULL;
1024 b43legacy_destroy_dmaring(dma->tx_ring3);
1025 dma->tx_ring3 = NULL;
1026 b43legacy_destroy_dmaring(dma->tx_ring2);
1027 dma->tx_ring2 = NULL;
1028 b43legacy_destroy_dmaring(dma->tx_ring1);
1029 dma->tx_ring1 = NULL;
1030 b43legacy_destroy_dmaring(dma->tx_ring0);
1031 dma->tx_ring0 = NULL;
1032 }
1033
1034 static int b43legacy_dma_set_mask(struct b43legacy_wldev *dev, u64 mask)
1035 {
1036 u64 orig_mask = mask;
1037 bool fallback = 0;
1038 int err;
1039
1040 /* Try to set the DMA mask. If it fails, try falling back to a
1041 * lower mask, as we can always also support a lower one. */
1042 while (1) {
1043 err = dma_set_mask(dev->dev->dma_dev, mask);
1044 if (!err) {
1045 err = dma_set_coherent_mask(dev->dev->dma_dev, mask);
1046 if (!err)
1047 break;
1048 }
1049 if (mask == DMA_BIT_MASK(64)) {
1050 mask = DMA_BIT_MASK(32);
1051 fallback = 1;
1052 continue;
1053 }
1054 if (mask == DMA_BIT_MASK(32)) {
1055 mask = DMA_BIT_MASK(30);
1056 fallback = 1;
1057 continue;
1058 }
1059 b43legacyerr(dev->wl, "The machine/kernel does not support "
1060 "the required %u-bit DMA mask\n",
1061 (unsigned int)dma_mask_to_engine_type(orig_mask));
1062 return -EOPNOTSUPP;
1063 }
1064 if (fallback) {
1065 b43legacyinfo(dev->wl, "DMA mask fallback from %u-bit to %u-"
1066 "bit\n",
1067 (unsigned int)dma_mask_to_engine_type(orig_mask),
1068 (unsigned int)dma_mask_to_engine_type(mask));
1069 }
1070
1071 return 0;
1072 }
1073
1074 int b43legacy_dma_init(struct b43legacy_wldev *dev)
1075 {
1076 struct b43legacy_dma *dma = &dev->dma;
1077 struct b43legacy_dmaring *ring;
1078 int err;
1079 u64 dmamask;
1080 enum b43legacy_dmatype type;
1081
1082 dmamask = supported_dma_mask(dev);
1083 type = dma_mask_to_engine_type(dmamask);
1084 err = b43legacy_dma_set_mask(dev, dmamask);
1085 if (err) {
1086 #ifdef CONFIG_B43LEGACY_PIO
1087 b43legacywarn(dev->wl, "DMA for this device not supported. "
1088 "Falling back to PIO\n");
1089 dev->__using_pio = 1;
1090 return -EAGAIN;
1091 #else
1092 b43legacyerr(dev->wl, "DMA for this device not supported and "
1093 "no PIO support compiled in\n");
1094 return -EOPNOTSUPP;
1095 #endif
1096 }
1097
1098 err = -ENOMEM;
1099 /* setup TX DMA channels. */
1100 ring = b43legacy_setup_dmaring(dev, 0, 1, type);
1101 if (!ring)
1102 goto out;
1103 dma->tx_ring0 = ring;
1104
1105 ring = b43legacy_setup_dmaring(dev, 1, 1, type);
1106 if (!ring)
1107 goto err_destroy_tx0;
1108 dma->tx_ring1 = ring;
1109
1110 ring = b43legacy_setup_dmaring(dev, 2, 1, type);
1111 if (!ring)
1112 goto err_destroy_tx1;
1113 dma->tx_ring2 = ring;
1114
1115 ring = b43legacy_setup_dmaring(dev, 3, 1, type);
1116 if (!ring)
1117 goto err_destroy_tx2;
1118 dma->tx_ring3 = ring;
1119
1120 ring = b43legacy_setup_dmaring(dev, 4, 1, type);
1121 if (!ring)
1122 goto err_destroy_tx3;
1123 dma->tx_ring4 = ring;
1124
1125 ring = b43legacy_setup_dmaring(dev, 5, 1, type);
1126 if (!ring)
1127 goto err_destroy_tx4;
1128 dma->tx_ring5 = ring;
1129
1130 /* setup RX DMA channels. */
1131 ring = b43legacy_setup_dmaring(dev, 0, 0, type);
1132 if (!ring)
1133 goto err_destroy_tx5;
1134 dma->rx_ring0 = ring;
1135
1136 if (dev->dev->id.revision < 5) {
1137 ring = b43legacy_setup_dmaring(dev, 3, 0, type);
1138 if (!ring)
1139 goto err_destroy_rx0;
1140 dma->rx_ring3 = ring;
1141 }
1142
1143 b43legacydbg(dev->wl, "%u-bit DMA initialized\n", (unsigned int)type);
1144 err = 0;
1145 out:
1146 return err;
1147
1148 err_destroy_rx0:
1149 b43legacy_destroy_dmaring(dma->rx_ring0);
1150 dma->rx_ring0 = NULL;
1151 err_destroy_tx5:
1152 b43legacy_destroy_dmaring(dma->tx_ring5);
1153 dma->tx_ring5 = NULL;
1154 err_destroy_tx4:
1155 b43legacy_destroy_dmaring(dma->tx_ring4);
1156 dma->tx_ring4 = NULL;
1157 err_destroy_tx3:
1158 b43legacy_destroy_dmaring(dma->tx_ring3);
1159 dma->tx_ring3 = NULL;
1160 err_destroy_tx2:
1161 b43legacy_destroy_dmaring(dma->tx_ring2);
1162 dma->tx_ring2 = NULL;
1163 err_destroy_tx1:
1164 b43legacy_destroy_dmaring(dma->tx_ring1);
1165 dma->tx_ring1 = NULL;
1166 err_destroy_tx0:
1167 b43legacy_destroy_dmaring(dma->tx_ring0);
1168 dma->tx_ring0 = NULL;
1169 goto out;
1170 }
1171
1172 /* Generate a cookie for the TX header. */
1173 static u16 generate_cookie(struct b43legacy_dmaring *ring,
1174 int slot)
1175 {
1176 u16 cookie = 0x1000;
1177
1178 /* Use the upper 4 bits of the cookie as
1179 * DMA controller ID and store the slot number
1180 * in the lower 12 bits.
1181 * Note that the cookie must never be 0, as this
1182 * is a special value used in RX path.
1183 */
1184 switch (ring->index) {
1185 case 0:
1186 cookie = 0xA000;
1187 break;
1188 case 1:
1189 cookie = 0xB000;
1190 break;
1191 case 2:
1192 cookie = 0xC000;
1193 break;
1194 case 3:
1195 cookie = 0xD000;
1196 break;
1197 case 4:
1198 cookie = 0xE000;
1199 break;
1200 case 5:
1201 cookie = 0xF000;
1202 break;
1203 }
1204 B43legacy_WARN_ON(!(((u16)slot & 0xF000) == 0x0000));
1205 cookie |= (u16)slot;
1206
1207 return cookie;
1208 }
1209
1210 /* Inspect a cookie and find out to which controller/slot it belongs. */
1211 static
1212 struct b43legacy_dmaring *parse_cookie(struct b43legacy_wldev *dev,
1213 u16 cookie, int *slot)
1214 {
1215 struct b43legacy_dma *dma = &dev->dma;
1216 struct b43legacy_dmaring *ring = NULL;
1217
1218 switch (cookie & 0xF000) {
1219 case 0xA000:
1220 ring = dma->tx_ring0;
1221 break;
1222 case 0xB000:
1223 ring = dma->tx_ring1;
1224 break;
1225 case 0xC000:
1226 ring = dma->tx_ring2;
1227 break;
1228 case 0xD000:
1229 ring = dma->tx_ring3;
1230 break;
1231 case 0xE000:
1232 ring = dma->tx_ring4;
1233 break;
1234 case 0xF000:
1235 ring = dma->tx_ring5;
1236 break;
1237 default:
1238 B43legacy_WARN_ON(1);
1239 }
1240 *slot = (cookie & 0x0FFF);
1241 B43legacy_WARN_ON(!(ring && *slot >= 0 && *slot < ring->nr_slots));
1242
1243 return ring;
1244 }
1245
1246 static int dma_tx_fragment(struct b43legacy_dmaring *ring,
1247 struct sk_buff **in_skb)
1248 {
1249 struct sk_buff *skb = *in_skb;
1250 const struct b43legacy_dma_ops *ops = ring->ops;
1251 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1252 u8 *header;
1253 int slot, old_top_slot, old_used_slots;
1254 int err;
1255 struct b43legacy_dmadesc_generic *desc;
1256 struct b43legacy_dmadesc_meta *meta;
1257 struct b43legacy_dmadesc_meta *meta_hdr;
1258 struct sk_buff *bounce_skb;
1259
1260 #define SLOTS_PER_PACKET 2
1261 B43legacy_WARN_ON(skb_shinfo(skb)->nr_frags != 0);
1262
1263 old_top_slot = ring->current_slot;
1264 old_used_slots = ring->used_slots;
1265
1266 /* Get a slot for the header. */
1267 slot = request_slot(ring);
1268 desc = ops->idx2desc(ring, slot, &meta_hdr);
1269 memset(meta_hdr, 0, sizeof(*meta_hdr));
1270
1271 header = &(ring->txhdr_cache[slot * sizeof(
1272 struct b43legacy_txhdr_fw3)]);
1273 err = b43legacy_generate_txhdr(ring->dev, header,
1274 skb->data, skb->len, info,
1275 generate_cookie(ring, slot));
1276 if (unlikely(err)) {
1277 ring->current_slot = old_top_slot;
1278 ring->used_slots = old_used_slots;
1279 return err;
1280 }
1281
1282 meta_hdr->dmaaddr = map_descbuffer(ring, (unsigned char *)header,
1283 sizeof(struct b43legacy_txhdr_fw3), 1);
1284 if (b43legacy_dma_mapping_error(ring, meta_hdr->dmaaddr,
1285 sizeof(struct b43legacy_txhdr_fw3), 1)) {
1286 ring->current_slot = old_top_slot;
1287 ring->used_slots = old_used_slots;
1288 return -EIO;
1289 }
1290 ops->fill_descriptor(ring, desc, meta_hdr->dmaaddr,
1291 sizeof(struct b43legacy_txhdr_fw3), 1, 0, 0);
1292
1293 /* Get a slot for the payload. */
1294 slot = request_slot(ring);
1295 desc = ops->idx2desc(ring, slot, &meta);
1296 memset(meta, 0, sizeof(*meta));
1297
1298 meta->skb = skb;
1299 meta->is_last_fragment = 1;
1300
1301 meta->dmaaddr = map_descbuffer(ring, skb->data, skb->len, 1);
1302 /* create a bounce buffer in zone_dma on mapping failure. */
1303 if (b43legacy_dma_mapping_error(ring, meta->dmaaddr, skb->len, 1)) {
1304 bounce_skb = __dev_alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA);
1305 if (!bounce_skb) {
1306 ring->current_slot = old_top_slot;
1307 ring->used_slots = old_used_slots;
1308 err = -ENOMEM;
1309 goto out_unmap_hdr;
1310 }
1311
1312 memcpy(skb_put(bounce_skb, skb->len), skb->data, skb->len);
1313 memcpy(bounce_skb->cb, skb->cb, sizeof(skb->cb));
1314 bounce_skb->dev = skb->dev;
1315 skb_set_queue_mapping(bounce_skb, skb_get_queue_mapping(skb));
1316 info = IEEE80211_SKB_CB(bounce_skb);
1317
1318 dev_kfree_skb_any(skb);
1319 skb = bounce_skb;
1320 *in_skb = bounce_skb;
1321 meta->skb = skb;
1322 meta->dmaaddr = map_descbuffer(ring, skb->data, skb->len, 1);
1323 if (b43legacy_dma_mapping_error(ring, meta->dmaaddr, skb->len, 1)) {
1324 ring->current_slot = old_top_slot;
1325 ring->used_slots = old_used_slots;
1326 err = -EIO;
1327 goto out_free_bounce;
1328 }
1329 }
1330
1331 ops->fill_descriptor(ring, desc, meta->dmaaddr,
1332 skb->len, 0, 1, 1);
1333
1334 wmb(); /* previous stuff MUST be done */
1335 /* Now transfer the whole frame. */
1336 ops->poke_tx(ring, next_slot(ring, slot));
1337 return 0;
1338
1339 out_free_bounce:
1340 dev_kfree_skb_any(skb);
1341 out_unmap_hdr:
1342 unmap_descbuffer(ring, meta_hdr->dmaaddr,
1343 sizeof(struct b43legacy_txhdr_fw3), 1);
1344 return err;
1345 }
1346
1347 static inline
1348 int should_inject_overflow(struct b43legacy_dmaring *ring)
1349 {
1350 #ifdef CONFIG_B43LEGACY_DEBUG
1351 if (unlikely(b43legacy_debug(ring->dev,
1352 B43legacy_DBG_DMAOVERFLOW))) {
1353 /* Check if we should inject another ringbuffer overflow
1354 * to test handling of this situation in the stack. */
1355 unsigned long next_overflow;
1356
1357 next_overflow = ring->last_injected_overflow + HZ;
1358 if (time_after(jiffies, next_overflow)) {
1359 ring->last_injected_overflow = jiffies;
1360 b43legacydbg(ring->dev->wl,
1361 "Injecting TX ring overflow on "
1362 "DMA controller %d\n", ring->index);
1363 return 1;
1364 }
1365 }
1366 #endif /* CONFIG_B43LEGACY_DEBUG */
1367 return 0;
1368 }
1369
1370 int b43legacy_dma_tx(struct b43legacy_wldev *dev,
1371 struct sk_buff *skb)
1372 {
1373 struct b43legacy_dmaring *ring;
1374 struct ieee80211_hdr *hdr;
1375 int err = 0;
1376 unsigned long flags;
1377 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1378
1379 ring = priority_to_txring(dev, skb_get_queue_mapping(skb));
1380 spin_lock_irqsave(&ring->lock, flags);
1381 B43legacy_WARN_ON(!ring->tx);
1382
1383 if (unlikely(ring->stopped)) {
1384 /* We get here only because of a bug in mac80211.
1385 * Because of a race, one packet may be queued after
1386 * the queue is stopped, thus we got called when we shouldn't.
1387 * For now, just refuse the transmit. */
1388 if (b43legacy_debug(dev, B43legacy_DBG_DMAVERBOSE))
1389 b43legacyerr(dev->wl, "Packet after queue stopped\n");
1390 err = -ENOSPC;
1391 goto out_unlock;
1392 }
1393
1394 if (unlikely(WARN_ON(free_slots(ring) < SLOTS_PER_PACKET))) {
1395 /* If we get here, we have a real error with the queue
1396 * full, but queues not stopped. */
1397 b43legacyerr(dev->wl, "DMA queue overflow\n");
1398 err = -ENOSPC;
1399 goto out_unlock;
1400 }
1401
1402 /* dma_tx_fragment might reallocate the skb, so invalidate pointers pointing
1403 * into the skb data or cb now. */
1404 hdr = NULL;
1405 info = NULL;
1406 err = dma_tx_fragment(ring, &skb);
1407 if (unlikely(err == -ENOKEY)) {
1408 /* Drop this packet, as we don't have the encryption key
1409 * anymore and must not transmit it unencrypted. */
1410 dev_kfree_skb_any(skb);
1411 err = 0;
1412 goto out_unlock;
1413 }
1414 if (unlikely(err)) {
1415 b43legacyerr(dev->wl, "DMA tx mapping failure\n");
1416 goto out_unlock;
1417 }
1418 if ((free_slots(ring) < SLOTS_PER_PACKET) ||
1419 should_inject_overflow(ring)) {
1420 /* This TX ring is full. */
1421 ieee80211_stop_queue(dev->wl->hw, txring_to_priority(ring));
1422 ring->stopped = 1;
1423 if (b43legacy_debug(dev, B43legacy_DBG_DMAVERBOSE))
1424 b43legacydbg(dev->wl, "Stopped TX ring %d\n",
1425 ring->index);
1426 }
1427 out_unlock:
1428 spin_unlock_irqrestore(&ring->lock, flags);
1429
1430 return err;
1431 }
1432
1433 void b43legacy_dma_handle_txstatus(struct b43legacy_wldev *dev,
1434 const struct b43legacy_txstatus *status)
1435 {
1436 const struct b43legacy_dma_ops *ops;
1437 struct b43legacy_dmaring *ring;
1438 struct b43legacy_dmadesc_generic *desc;
1439 struct b43legacy_dmadesc_meta *meta;
1440 int retry_limit;
1441 int slot;
1442
1443 ring = parse_cookie(dev, status->cookie, &slot);
1444 if (unlikely(!ring))
1445 return;
1446 B43legacy_WARN_ON(!irqs_disabled());
1447 spin_lock(&ring->lock);
1448
1449 B43legacy_WARN_ON(!ring->tx);
1450 ops = ring->ops;
1451 while (1) {
1452 B43legacy_WARN_ON(!(slot >= 0 && slot < ring->nr_slots));
1453 desc = ops->idx2desc(ring, slot, &meta);
1454
1455 if (meta->skb)
1456 unmap_descbuffer(ring, meta->dmaaddr,
1457 meta->skb->len, 1);
1458 else
1459 unmap_descbuffer(ring, meta->dmaaddr,
1460 sizeof(struct b43legacy_txhdr_fw3),
1461 1);
1462
1463 if (meta->is_last_fragment) {
1464 struct ieee80211_tx_info *info;
1465 BUG_ON(!meta->skb);
1466 info = IEEE80211_SKB_CB(meta->skb);
1467
1468 /* preserve the confiured retry limit before clearing the status
1469 * The xmit function has overwritten the rc's value with the actual
1470 * retry limit done by the hardware */
1471 retry_limit = info->status.rates[0].count;
1472 ieee80211_tx_info_clear_status(info);
1473
1474 if (status->acked)
1475 info->flags |= IEEE80211_TX_STAT_ACK;
1476
1477 if (status->rts_count > dev->wl->hw->conf.short_frame_max_tx_count) {
1478 /*
1479 * If the short retries (RTS, not data frame) have exceeded
1480 * the limit, the hw will not have tried the selected rate,
1481 * but will have used the fallback rate instead.
1482 * Don't let the rate control count attempts for the selected
1483 * rate in this case, otherwise the statistics will be off.
1484 */
1485 info->status.rates[0].count = 0;
1486 info->status.rates[1].count = status->frame_count;
1487 } else {
1488 if (status->frame_count > retry_limit) {
1489 info->status.rates[0].count = retry_limit;
1490 info->status.rates[1].count = status->frame_count -
1491 retry_limit;
1492
1493 } else {
1494 info->status.rates[0].count = status->frame_count;
1495 info->status.rates[1].idx = -1;
1496 }
1497 }
1498
1499 /* Call back to inform the ieee80211 subsystem about the
1500 * status of the transmission.
1501 * Some fields of txstat are already filled in dma_tx().
1502 */
1503 ieee80211_tx_status_irqsafe(dev->wl->hw, meta->skb);
1504 /* skb is freed by ieee80211_tx_status_irqsafe() */
1505 meta->skb = NULL;
1506 } else {
1507 /* No need to call free_descriptor_buffer here, as
1508 * this is only the txhdr, which is not allocated.
1509 */
1510 B43legacy_WARN_ON(meta->skb != NULL);
1511 }
1512
1513 /* Everything unmapped and free'd. So it's not used anymore. */
1514 ring->used_slots--;
1515
1516 if (meta->is_last_fragment)
1517 break;
1518 slot = next_slot(ring, slot);
1519 }
1520 dev->stats.last_tx = jiffies;
1521 if (ring->stopped) {
1522 B43legacy_WARN_ON(free_slots(ring) < SLOTS_PER_PACKET);
1523 ieee80211_wake_queue(dev->wl->hw, txring_to_priority(ring));
1524 ring->stopped = 0;
1525 if (b43legacy_debug(dev, B43legacy_DBG_DMAVERBOSE))
1526 b43legacydbg(dev->wl, "Woke up TX ring %d\n",
1527 ring->index);
1528 }
1529
1530 spin_unlock(&ring->lock);
1531 }
1532
1533 static void dma_rx(struct b43legacy_dmaring *ring,
1534 int *slot)
1535 {
1536 const struct b43legacy_dma_ops *ops = ring->ops;
1537 struct b43legacy_dmadesc_generic *desc;
1538 struct b43legacy_dmadesc_meta *meta;
1539 struct b43legacy_rxhdr_fw3 *rxhdr;
1540 struct sk_buff *skb;
1541 u16 len;
1542 int err;
1543 dma_addr_t dmaaddr;
1544
1545 desc = ops->idx2desc(ring, *slot, &meta);
1546
1547 sync_descbuffer_for_cpu(ring, meta->dmaaddr, ring->rx_buffersize);
1548 skb = meta->skb;
1549
1550 if (ring->index == 3) {
1551 /* We received an xmit status. */
1552 struct b43legacy_hwtxstatus *hw =
1553 (struct b43legacy_hwtxstatus *)skb->data;
1554 int i = 0;
1555
1556 while (hw->cookie == 0) {
1557 if (i > 100)
1558 break;
1559 i++;
1560 udelay(2);
1561 barrier();
1562 }
1563 b43legacy_handle_hwtxstatus(ring->dev, hw);
1564 /* recycle the descriptor buffer. */
1565 sync_descbuffer_for_device(ring, meta->dmaaddr,
1566 ring->rx_buffersize);
1567
1568 return;
1569 }
1570 rxhdr = (struct b43legacy_rxhdr_fw3 *)skb->data;
1571 len = le16_to_cpu(rxhdr->frame_len);
1572 if (len == 0) {
1573 int i = 0;
1574
1575 do {
1576 udelay(2);
1577 barrier();
1578 len = le16_to_cpu(rxhdr->frame_len);
1579 } while (len == 0 && i++ < 5);
1580 if (unlikely(len == 0)) {
1581 /* recycle the descriptor buffer. */
1582 sync_descbuffer_for_device(ring, meta->dmaaddr,
1583 ring->rx_buffersize);
1584 goto drop;
1585 }
1586 }
1587 if (unlikely(len > ring->rx_buffersize)) {
1588 /* The data did not fit into one descriptor buffer
1589 * and is split over multiple buffers.
1590 * This should never happen, as we try to allocate buffers
1591 * big enough. So simply ignore this packet.
1592 */
1593 int cnt = 0;
1594 s32 tmp = len;
1595
1596 while (1) {
1597 desc = ops->idx2desc(ring, *slot, &meta);
1598 /* recycle the descriptor buffer. */
1599 sync_descbuffer_for_device(ring, meta->dmaaddr,
1600 ring->rx_buffersize);
1601 *slot = next_slot(ring, *slot);
1602 cnt++;
1603 tmp -= ring->rx_buffersize;
1604 if (tmp <= 0)
1605 break;
1606 }
1607 b43legacyerr(ring->dev->wl, "DMA RX buffer too small "
1608 "(len: %u, buffer: %u, nr-dropped: %d)\n",
1609 len, ring->rx_buffersize, cnt);
1610 goto drop;
1611 }
1612
1613 dmaaddr = meta->dmaaddr;
1614 err = setup_rx_descbuffer(ring, desc, meta, GFP_ATOMIC);
1615 if (unlikely(err)) {
1616 b43legacydbg(ring->dev->wl, "DMA RX: setup_rx_descbuffer()"
1617 " failed\n");
1618 sync_descbuffer_for_device(ring, dmaaddr,
1619 ring->rx_buffersize);
1620 goto drop;
1621 }
1622
1623 unmap_descbuffer(ring, dmaaddr, ring->rx_buffersize, 0);
1624 skb_put(skb, len + ring->frameoffset);
1625 skb_pull(skb, ring->frameoffset);
1626
1627 b43legacy_rx(ring->dev, skb, rxhdr);
1628 drop:
1629 return;
1630 }
1631
1632 void b43legacy_dma_rx(struct b43legacy_dmaring *ring)
1633 {
1634 const struct b43legacy_dma_ops *ops = ring->ops;
1635 int slot;
1636 int current_slot;
1637 int used_slots = 0;
1638
1639 B43legacy_WARN_ON(ring->tx);
1640 current_slot = ops->get_current_rxslot(ring);
1641 B43legacy_WARN_ON(!(current_slot >= 0 && current_slot <
1642 ring->nr_slots));
1643
1644 slot = ring->current_slot;
1645 for (; slot != current_slot; slot = next_slot(ring, slot)) {
1646 dma_rx(ring, &slot);
1647 update_max_used_slots(ring, ++used_slots);
1648 }
1649 ops->set_current_rxslot(ring, slot);
1650 ring->current_slot = slot;
1651 }
1652
1653 static void b43legacy_dma_tx_suspend_ring(struct b43legacy_dmaring *ring)
1654 {
1655 unsigned long flags;
1656
1657 spin_lock_irqsave(&ring->lock, flags);
1658 B43legacy_WARN_ON(!ring->tx);
1659 ring->ops->tx_suspend(ring);
1660 spin_unlock_irqrestore(&ring->lock, flags);
1661 }
1662
1663 static void b43legacy_dma_tx_resume_ring(struct b43legacy_dmaring *ring)
1664 {
1665 unsigned long flags;
1666
1667 spin_lock_irqsave(&ring->lock, flags);
1668 B43legacy_WARN_ON(!ring->tx);
1669 ring->ops->tx_resume(ring);
1670 spin_unlock_irqrestore(&ring->lock, flags);
1671 }
1672
1673 void b43legacy_dma_tx_suspend(struct b43legacy_wldev *dev)
1674 {
1675 b43legacy_power_saving_ctl_bits(dev, -1, 1);
1676 b43legacy_dma_tx_suspend_ring(dev->dma.tx_ring0);
1677 b43legacy_dma_tx_suspend_ring(dev->dma.tx_ring1);
1678 b43legacy_dma_tx_suspend_ring(dev->dma.tx_ring2);
1679 b43legacy_dma_tx_suspend_ring(dev->dma.tx_ring3);
1680 b43legacy_dma_tx_suspend_ring(dev->dma.tx_ring4);
1681 b43legacy_dma_tx_suspend_ring(dev->dma.tx_ring5);
1682 }
1683
1684 void b43legacy_dma_tx_resume(struct b43legacy_wldev *dev)
1685 {
1686 b43legacy_dma_tx_resume_ring(dev->dma.tx_ring5);
1687 b43legacy_dma_tx_resume_ring(dev->dma.tx_ring4);
1688 b43legacy_dma_tx_resume_ring(dev->dma.tx_ring3);
1689 b43legacy_dma_tx_resume_ring(dev->dma.tx_ring2);
1690 b43legacy_dma_tx_resume_ring(dev->dma.tx_ring1);
1691 b43legacy_dma_tx_resume_ring(dev->dma.tx_ring0);
1692 b43legacy_power_saving_ctl_bits(dev, -1, -1);
1693 }
linux-next