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Update bcm43xx-mac80211 to latest git pull, mostly debugging improvements
[openwrt.git] / package / bcm43xx-mac80211 / src / bcm43xx / bcm43xx_dma.c
1 /*
2
3 Broadcom BCM43xx 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 "bcm43xx.h"
31 #include "bcm43xx_dma.h"
32 #include "bcm43xx_main.h"
33 #include "bcm43xx_debugfs.h"
34 #include "bcm43xx_power.h"
35 #include "bcm43xx_xmit.h"
36
37 #include <linux/dma-mapping.h>
38 #include <linux/pci.h>
39 #include <linux/delay.h>
40 #include <linux/skbuff.h>
41
42
43 /* 32bit DMA ops. */
44 static
45 struct bcm43xx_dmadesc_generic * op32_idx2desc(struct bcm43xx_dmaring *ring,
46 int slot,
47 struct bcm43xx_dmadesc_meta **meta)
48 {
49 struct bcm43xx_dmadesc32 *desc;
50
51 *meta = &(ring->meta[slot]);
52 desc = ring->descbase;
53 desc = &(desc[slot]);
54
55 return (struct bcm43xx_dmadesc_generic *)desc;
56 }
57
58 static void op32_fill_descriptor(struct bcm43xx_dmaring *ring,
59 struct bcm43xx_dmadesc_generic *desc,
60 dma_addr_t dmaaddr, u16 bufsize,
61 int start, int end, int irq)
62 {
63 struct bcm43xx_dmadesc32 *descbase = ring->descbase;
64 int slot;
65 u32 ctl;
66 u32 addr;
67 u32 addrext;
68
69 slot = (int)(&(desc->dma32) - descbase);
70 assert(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 & BCM43xx_DMA32_DCTL_BYTECNT;
78 if (slot == ring->nr_slots - 1)
79 ctl |= BCM43xx_DMA32_DCTL_DTABLEEND;
80 if (start)
81 ctl |= BCM43xx_DMA32_DCTL_FRAMESTART;
82 if (end)
83 ctl |= BCM43xx_DMA32_DCTL_FRAMEEND;
84 if (irq)
85 ctl |= BCM43xx_DMA32_DCTL_IRQ;
86 ctl |= (addrext << BCM43xx_DMA32_DCTL_ADDREXT_SHIFT)
87 & BCM43xx_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 bcm43xx_dmaring *ring, int slot)
94 {
95 bcm43xx_dma_write(ring, BCM43xx_DMA32_TXINDEX,
96 (u32)(slot * sizeof(struct bcm43xx_dmadesc32)));
97 }
98
99 static void op32_tx_suspend(struct bcm43xx_dmaring *ring)
100 {
101 bcm43xx_dma_write(ring, BCM43xx_DMA32_TXCTL,
102 bcm43xx_dma_read(ring, BCM43xx_DMA32_TXCTL)
103 | BCM43xx_DMA32_TXSUSPEND);
104 }
105
106 static void op32_tx_resume(struct bcm43xx_dmaring *ring)
107 {
108 bcm43xx_dma_write(ring, BCM43xx_DMA32_TXCTL,
109 bcm43xx_dma_read(ring, BCM43xx_DMA32_TXCTL)
110 & ~BCM43xx_DMA32_TXSUSPEND);
111 }
112
113 static int op32_get_current_rxslot(struct bcm43xx_dmaring *ring)
114 {
115 u32 val;
116
117 val = bcm43xx_dma_read(ring, BCM43xx_DMA32_RXSTATUS);
118 val &= BCM43xx_DMA32_RXDPTR;
119
120 return (val / sizeof(struct bcm43xx_dmadesc32));
121 }
122
123 static void op32_set_current_rxslot(struct bcm43xx_dmaring *ring,
124 int slot)
125 {
126 bcm43xx_dma_write(ring, BCM43xx_DMA32_RXINDEX,
127 (u32)(slot * sizeof(struct bcm43xx_dmadesc32)));
128 }
129
130 static const struct bcm43xx_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 bcm43xx_dmadesc_generic * op64_idx2desc(struct bcm43xx_dmaring *ring,
143 int slot,
144 struct bcm43xx_dmadesc_meta **meta)
145 {
146 struct bcm43xx_dmadesc64 *desc;
147
148 *meta = &(ring->meta[slot]);
149 desc = ring->descbase;
150 desc = &(desc[slot]);
151
152 return (struct bcm43xx_dmadesc_generic *)desc;
153 }
154
155 static void op64_fill_descriptor(struct bcm43xx_dmaring *ring,
156 struct bcm43xx_dmadesc_generic *desc,
157 dma_addr_t dmaaddr, u16 bufsize,
158 int start, int end, int irq)
159 {
160 struct bcm43xx_dmadesc64 *descbase = ring->descbase;
161 int slot;
162 u32 ctl0 = 0, ctl1 = 0;
163 u32 addrlo, addrhi;
164 u32 addrext;
165
166 slot = (int)(&(desc->dma64) - descbase);
167 assert(slot >= 0 && slot < ring->nr_slots);
168
169 addrlo = (u32)(dmaaddr & 0xFFFFFFFF);
170 addrhi = (((u64)dmaaddr >> 32) & ~SSB_DMA_TRANSLATION_MASK);
171 addrext = (((u64)dmaaddr >> 32) & SSB_DMA_TRANSLATION_MASK)
172 >> SSB_DMA_TRANSLATION_SHIFT;
173 addrhi |= ssb_dma_translation(ring->dev->dev);
174 if (slot == ring->nr_slots - 1)
175 ctl0 |= BCM43xx_DMA64_DCTL0_DTABLEEND;
176 if (start)
177 ctl0 |= BCM43xx_DMA64_DCTL0_FRAMESTART;
178 if (end)
179 ctl0 |= BCM43xx_DMA64_DCTL0_FRAMEEND;
180 if (irq)
181 ctl0 |= BCM43xx_DMA64_DCTL0_IRQ;
182 ctl1 |= (bufsize - ring->frameoffset)
183 & BCM43xx_DMA64_DCTL1_BYTECNT;
184 ctl1 |= (addrext << BCM43xx_DMA64_DCTL1_ADDREXT_SHIFT)
185 & BCM43xx_DMA64_DCTL1_ADDREXT_MASK;
186
187 desc->dma64.control0 = cpu_to_le32(ctl0);
188 desc->dma64.control1 = cpu_to_le32(ctl1);
189 desc->dma64.address_low = cpu_to_le32(addrlo);
190 desc->dma64.address_high = cpu_to_le32(addrhi);
191 }
192
193 static void op64_poke_tx(struct bcm43xx_dmaring *ring, int slot)
194 {
195 bcm43xx_dma_write(ring, BCM43xx_DMA64_TXINDEX,
196 (u32)(slot * sizeof(struct bcm43xx_dmadesc64)));
197 }
198
199 static void op64_tx_suspend(struct bcm43xx_dmaring *ring)
200 {
201 bcm43xx_dma_write(ring, BCM43xx_DMA64_TXCTL,
202 bcm43xx_dma_read(ring, BCM43xx_DMA64_TXCTL)
203 | BCM43xx_DMA64_TXSUSPEND);
204 }
205
206 static void op64_tx_resume(struct bcm43xx_dmaring *ring)
207 {
208 bcm43xx_dma_write(ring, BCM43xx_DMA64_TXCTL,
209 bcm43xx_dma_read(ring, BCM43xx_DMA64_TXCTL)
210 & ~BCM43xx_DMA64_TXSUSPEND);
211 }
212
213 static int op64_get_current_rxslot(struct bcm43xx_dmaring *ring)
214 {
215 u32 val;
216
217 val = bcm43xx_dma_read(ring, BCM43xx_DMA64_RXSTATUS);
218 val &= BCM43xx_DMA64_RXSTATDPTR;
219
220 return (val / sizeof(struct bcm43xx_dmadesc64));
221 }
222
223 static void op64_set_current_rxslot(struct bcm43xx_dmaring *ring,
224 int slot)
225 {
226 bcm43xx_dma_write(ring, BCM43xx_DMA64_RXINDEX,
227 (u32)(slot * sizeof(struct bcm43xx_dmadesc64)));
228 }
229
230 static const struct bcm43xx_dma_ops dma64_ops = {
231 .idx2desc = op64_idx2desc,
232 .fill_descriptor = op64_fill_descriptor,
233 .poke_tx = op64_poke_tx,
234 .tx_suspend = op64_tx_suspend,
235 .tx_resume = op64_tx_resume,
236 .get_current_rxslot = op64_get_current_rxslot,
237 .set_current_rxslot = op64_set_current_rxslot,
238 };
239
240
241 static inline int free_slots(struct bcm43xx_dmaring *ring)
242 {
243 return (ring->nr_slots - ring->used_slots);
244 }
245
246 static inline int next_slot(struct bcm43xx_dmaring *ring, int slot)
247 {
248 assert(slot >= -1 && slot <= ring->nr_slots - 1);
249 if (slot == ring->nr_slots - 1)
250 return 0;
251 return slot + 1;
252 }
253
254 static inline int prev_slot(struct bcm43xx_dmaring *ring, int slot)
255 {
256 assert(slot >= 0 && slot <= ring->nr_slots - 1);
257 if (slot == 0)
258 return ring->nr_slots - 1;
259 return slot - 1;
260 }
261
262 #ifdef CONFIG_BCM43XX_MAC80211_DEBUG
263 static void update_max_used_slots(struct bcm43xx_dmaring *ring,
264 int current_used_slots)
265 {
266 if (current_used_slots <= ring->max_used_slots)
267 return;
268 ring->max_used_slots = current_used_slots;
269 if (bcm43xx_debug(ring->dev, BCM43xx_DBG_DMAVERBOSE)) {
270 dprintk(KERN_DEBUG PFX
271 "max_used_slots increased to %d on %s ring %d\n",
272 ring->max_used_slots,
273 ring->tx ? "TX" : "RX",
274 ring->index);
275 }
276 }
277 #else
278 static inline
279 void update_max_used_slots(struct bcm43xx_dmaring *ring,
280 int current_used_slots)
281 { }
282 #endif /* DEBUG */
283
284 /* Request a slot for usage. */
285 static inline
286 int request_slot(struct bcm43xx_dmaring *ring)
287 {
288 int slot;
289
290 assert(ring->tx);
291 assert(!ring->stopped);
292 assert(free_slots(ring) != 0);
293
294 slot = next_slot(ring, ring->current_slot);
295 ring->current_slot = slot;
296 ring->used_slots++;
297
298 update_max_used_slots(ring, ring->used_slots);
299
300 return slot;
301 }
302
303 /* Mac80211-queue to bcm43xx-ring mapping */
304 static struct bcm43xx_dmaring * priority_to_txring(struct bcm43xx_wldev *dev,
305 int queue_priority)
306 {
307 struct bcm43xx_dmaring *ring;
308
309 /*FIXME: For now we always run on TX-ring-1 */
310 return dev->dma.tx_ring1;
311
312 /* 0 = highest priority */
313 switch (queue_priority) {
314 default:
315 assert(0);
316 /* fallthrough */
317 case 0:
318 ring = dev->dma.tx_ring3;
319 break;
320 case 1:
321 ring = dev->dma.tx_ring2;
322 break;
323 case 2:
324 ring = dev->dma.tx_ring1;
325 break;
326 case 3:
327 ring = dev->dma.tx_ring0;
328 break;
329 case 4:
330 ring = dev->dma.tx_ring4;
331 break;
332 case 5:
333 ring = dev->dma.tx_ring5;
334 break;
335 }
336
337 return ring;
338 }
339
340 /* Bcm43xx-ring to mac80211-queue mapping */
341 static inline int txring_to_priority(struct bcm43xx_dmaring *ring)
342 {
343 static const u8 idx_to_prio[] =
344 { 3, 2, 1, 0, 4, 5, };
345
346 /*FIXME: have only one queue, for now */
347 return 0;
348
349 return idx_to_prio[ring->index];
350 }
351
352
353 u16 bcm43xx_dmacontroller_base(int dma64bit, int controller_idx)
354 {
355 static const u16 map64[] = {
356 BCM43xx_MMIO_DMA64_BASE0,
357 BCM43xx_MMIO_DMA64_BASE1,
358 BCM43xx_MMIO_DMA64_BASE2,
359 BCM43xx_MMIO_DMA64_BASE3,
360 BCM43xx_MMIO_DMA64_BASE4,
361 BCM43xx_MMIO_DMA64_BASE5,
362 };
363 static const u16 map32[] = {
364 BCM43xx_MMIO_DMA32_BASE0,
365 BCM43xx_MMIO_DMA32_BASE1,
366 BCM43xx_MMIO_DMA32_BASE2,
367 BCM43xx_MMIO_DMA32_BASE3,
368 BCM43xx_MMIO_DMA32_BASE4,
369 BCM43xx_MMIO_DMA32_BASE5,
370 };
371
372 if (dma64bit) {
373 assert(controller_idx >= 0 &&
374 controller_idx < ARRAY_SIZE(map64));
375 return map64[controller_idx];
376 }
377 assert(controller_idx >= 0 &&
378 controller_idx < ARRAY_SIZE(map32));
379 return map32[controller_idx];
380 }
381
382 static inline
383 dma_addr_t map_descbuffer(struct bcm43xx_dmaring *ring,
384 unsigned char *buf,
385 size_t len,
386 int tx)
387 {
388 dma_addr_t dmaaddr;
389
390 if (tx) {
391 dmaaddr = dma_map_single(ring->dev->dev->dev,
392 buf, len,
393 DMA_TO_DEVICE);
394 } else {
395 dmaaddr = dma_map_single(ring->dev->dev->dev,
396 buf, len,
397 DMA_FROM_DEVICE);
398 }
399
400 return dmaaddr;
401 }
402
403 static inline
404 void unmap_descbuffer(struct bcm43xx_dmaring *ring,
405 dma_addr_t addr,
406 size_t len,
407 int tx)
408 {
409 if (tx) {
410 dma_unmap_single(ring->dev->dev->dev,
411 addr, len,
412 DMA_TO_DEVICE);
413 } else {
414 dma_unmap_single(ring->dev->dev->dev,
415 addr, len,
416 DMA_FROM_DEVICE);
417 }
418 }
419
420 static inline
421 void sync_descbuffer_for_cpu(struct bcm43xx_dmaring *ring,
422 dma_addr_t addr,
423 size_t len)
424 {
425 assert(!ring->tx);
426
427 dma_sync_single_for_cpu(ring->dev->dev->dev,
428 addr, len, DMA_FROM_DEVICE);
429 }
430
431 static inline
432 void sync_descbuffer_for_device(struct bcm43xx_dmaring *ring,
433 dma_addr_t addr,
434 size_t len)
435 {
436 assert(!ring->tx);
437
438 dma_sync_single_for_device(ring->dev->dev->dev,
439 addr, len, DMA_FROM_DEVICE);
440 }
441
442 static inline
443 void free_descriptor_buffer(struct bcm43xx_dmaring *ring,
444 struct bcm43xx_dmadesc_meta *meta,
445 int irq_context)
446 {
447 if (meta->skb) {
448 if (irq_context)
449 dev_kfree_skb_irq(meta->skb);
450 else
451 dev_kfree_skb(meta->skb);
452 meta->skb = NULL;
453 }
454 }
455
456 static int alloc_ringmemory(struct bcm43xx_dmaring *ring)
457 {
458 struct device *dev = ring->dev->dev->dev;
459
460 ring->descbase = dma_alloc_coherent(dev, BCM43xx_DMA_RINGMEMSIZE,
461 &(ring->dmabase), GFP_KERNEL);
462 if (!ring->descbase) {
463 printk(KERN_ERR PFX "DMA ringmemory allocation failed\n");
464 return -ENOMEM;
465 }
466 memset(ring->descbase, 0, BCM43xx_DMA_RINGMEMSIZE);
467
468 return 0;
469 }
470
471 static void free_ringmemory(struct bcm43xx_dmaring *ring)
472 {
473 struct device *dev = ring->dev->dev->dev;
474
475 dma_free_coherent(dev, BCM43xx_DMA_RINGMEMSIZE,
476 ring->descbase, ring->dmabase);
477 }
478
479 /* Reset the RX DMA channel */
480 int bcm43xx_dmacontroller_rx_reset(struct bcm43xx_wldev *dev,
481 u16 mmio_base, int dma64)
482 {
483 int i;
484 u32 value;
485 u16 offset;
486
487 might_sleep();
488
489 offset = dma64 ? BCM43xx_DMA64_RXCTL : BCM43xx_DMA32_RXCTL;
490 bcm43xx_write32(dev, mmio_base + offset, 0);
491 for (i = 0; i < 10; i++) {
492 offset = dma64 ? BCM43xx_DMA64_RXSTATUS : BCM43xx_DMA32_RXSTATUS;
493 value = bcm43xx_read32(dev, mmio_base + offset);
494 if (dma64) {
495 value &= BCM43xx_DMA64_RXSTAT;
496 if (value == BCM43xx_DMA64_RXSTAT_DISABLED) {
497 i = -1;
498 break;
499 }
500 } else {
501 value &= BCM43xx_DMA32_RXSTATE;
502 if (value == BCM43xx_DMA32_RXSTAT_DISABLED) {
503 i = -1;
504 break;
505 }
506 }
507 msleep(1);
508 }
509 if (i != -1) {
510 printk(KERN_ERR PFX "ERROR: DMA RX reset timed out\n");
511 return -ENODEV;
512 }
513
514 return 0;
515 }
516
517 /* Reset the RX DMA channel */
518 int bcm43xx_dmacontroller_tx_reset(struct bcm43xx_wldev *dev,
519 u16 mmio_base, int dma64)
520 {
521 int i;
522 u32 value;
523 u16 offset;
524
525 might_sleep();
526
527 for (i = 0; i < 10; i++) {
528 offset = dma64 ? BCM43xx_DMA64_TXSTATUS : BCM43xx_DMA32_TXSTATUS;
529 value = bcm43xx_read32(dev, mmio_base + offset);
530 if (dma64) {
531 value &= BCM43xx_DMA64_TXSTAT;
532 if (value == BCM43xx_DMA64_TXSTAT_DISABLED ||
533 value == BCM43xx_DMA64_TXSTAT_IDLEWAIT ||
534 value == BCM43xx_DMA64_TXSTAT_STOPPED)
535 break;
536 } else {
537 value &= BCM43xx_DMA32_TXSTATE;
538 if (value == BCM43xx_DMA32_TXSTAT_DISABLED ||
539 value == BCM43xx_DMA32_TXSTAT_IDLEWAIT ||
540 value == BCM43xx_DMA32_TXSTAT_STOPPED)
541 break;
542 }
543 msleep(1);
544 }
545 offset = dma64 ? BCM43xx_DMA64_TXCTL : BCM43xx_DMA32_TXCTL;
546 bcm43xx_write32(dev, mmio_base + offset, 0);
547 for (i = 0; i < 10; i++) {
548 offset = dma64 ? BCM43xx_DMA64_TXSTATUS : BCM43xx_DMA32_TXSTATUS;
549 value = bcm43xx_read32(dev, mmio_base + offset);
550 if (dma64) {
551 value &= BCM43xx_DMA64_TXSTAT;
552 if (value == BCM43xx_DMA64_TXSTAT_DISABLED) {
553 i = -1;
554 break;
555 }
556 } else {
557 value &= BCM43xx_DMA32_TXSTATE;
558 if (value == BCM43xx_DMA32_TXSTAT_DISABLED) {
559 i = -1;
560 break;
561 }
562 }
563 msleep(1);
564 }
565 if (i != -1) {
566 printk(KERN_ERR PFX "ERROR: DMA TX reset timed out\n");
567 return -ENODEV;
568 }
569 /* ensure the reset is completed. */
570 msleep(1);
571
572 return 0;
573 }
574
575 static int setup_rx_descbuffer(struct bcm43xx_dmaring *ring,
576 struct bcm43xx_dmadesc_generic *desc,
577 struct bcm43xx_dmadesc_meta *meta,
578 gfp_t gfp_flags)
579 {
580 struct bcm43xx_rxhdr_fw4 *rxhdr;
581 struct bcm43xx_hwtxstatus *txstat;
582 dma_addr_t dmaaddr;
583 struct sk_buff *skb;
584
585 assert(!ring->tx);
586
587 skb = __dev_alloc_skb(ring->rx_buffersize, gfp_flags);
588 if (unlikely(!skb))
589 return -ENOMEM;
590 dmaaddr = map_descbuffer(ring, skb->data,
591 ring->rx_buffersize, 0);
592 if (dma_mapping_error(dmaaddr)) {
593 /* ugh. try to realloc in zone_dma */
594 gfp_flags |= GFP_DMA;
595
596 dev_kfree_skb_any(skb);
597
598 skb = __dev_alloc_skb(ring->rx_buffersize, gfp_flags);
599 if (unlikely(!skb))
600 return -ENOMEM;
601 dmaaddr = map_descbuffer(ring, skb->data,
602 ring->rx_buffersize, 0);
603 }
604
605 if (dma_mapping_error(dmaaddr)) {
606 dev_kfree_skb_any(skb);
607 return -EIO;
608 }
609
610 meta->skb = skb;
611 meta->dmaaddr = dmaaddr;
612 ring->ops->fill_descriptor(ring, desc, dmaaddr,
613 ring->rx_buffersize, 0, 0, 0);
614
615 rxhdr = (struct bcm43xx_rxhdr_fw4 *)(skb->data);
616 rxhdr->frame_len = 0;
617 txstat = (struct bcm43xx_hwtxstatus *)(skb->data);
618 txstat->cookie = 0;
619
620 return 0;
621 }
622
623 /* Allocate the initial descbuffers.
624 * This is used for an RX ring only.
625 */
626 static int alloc_initial_descbuffers(struct bcm43xx_dmaring *ring)
627 {
628 int i, err = -ENOMEM;
629 struct bcm43xx_dmadesc_generic *desc;
630 struct bcm43xx_dmadesc_meta *meta;
631
632 for (i = 0; i < ring->nr_slots; i++) {
633 desc = ring->ops->idx2desc(ring, i, &meta);
634
635 err = setup_rx_descbuffer(ring, desc, meta, GFP_KERNEL);
636 if (err) {
637 printk(KERN_ERR PFX "Failed to allocate initial descbuffers\n");
638 goto err_unwind;
639 }
640 }
641 mb();
642 ring->used_slots = ring->nr_slots;
643 err = 0;
644 out:
645 return err;
646
647 err_unwind:
648 for (i--; i >= 0; i--) {
649 desc = ring->ops->idx2desc(ring, i, &meta);
650
651 unmap_descbuffer(ring, meta->dmaaddr, ring->rx_buffersize, 0);
652 dev_kfree_skb(meta->skb);
653 }
654 goto out;
655 }
656
657 /* Do initial setup of the DMA controller.
658 * Reset the controller, write the ring busaddress
659 * and switch the "enable" bit on.
660 */
661 static int dmacontroller_setup(struct bcm43xx_dmaring *ring)
662 {
663 int err = 0;
664 u32 value;
665 u32 addrext;
666 u32 trans = ssb_dma_translation(ring->dev->dev);
667
668 if (ring->tx) {
669 if (ring->dma64) {
670 u64 ringbase = (u64)(ring->dmabase);
671
672 addrext = ((ringbase >> 32) & SSB_DMA_TRANSLATION_MASK)
673 >> SSB_DMA_TRANSLATION_SHIFT;
674 value = BCM43xx_DMA64_TXENABLE;
675 value |= (addrext << BCM43xx_DMA64_TXADDREXT_SHIFT)
676 & BCM43xx_DMA64_TXADDREXT_MASK;
677 bcm43xx_dma_write(ring, BCM43xx_DMA64_TXCTL, value);
678 bcm43xx_dma_write(ring, BCM43xx_DMA64_TXRINGLO,
679 (ringbase & 0xFFFFFFFF));
680 bcm43xx_dma_write(ring, BCM43xx_DMA64_TXRINGHI,
681 ((ringbase >> 32) & ~SSB_DMA_TRANSLATION_MASK)
682 | trans);
683 } else {
684 u32 ringbase = (u32)(ring->dmabase);
685
686 addrext = (ringbase & SSB_DMA_TRANSLATION_MASK)
687 >> SSB_DMA_TRANSLATION_SHIFT;
688 value = BCM43xx_DMA32_TXENABLE;
689 value |= (addrext << BCM43xx_DMA32_TXADDREXT_SHIFT)
690 & BCM43xx_DMA32_TXADDREXT_MASK;
691 bcm43xx_dma_write(ring, BCM43xx_DMA32_TXCTL, value);
692 bcm43xx_dma_write(ring, BCM43xx_DMA32_TXRING,
693 (ringbase & ~SSB_DMA_TRANSLATION_MASK)
694 | trans);
695 }
696 } else {
697 err = alloc_initial_descbuffers(ring);
698 if (err)
699 goto out;
700 if (ring->dma64) {
701 u64 ringbase = (u64)(ring->dmabase);
702
703 addrext = ((ringbase >> 32) & SSB_DMA_TRANSLATION_MASK)
704 >> SSB_DMA_TRANSLATION_SHIFT;
705 value = (ring->frameoffset << BCM43xx_DMA64_RXFROFF_SHIFT);
706 value |= BCM43xx_DMA64_RXENABLE;
707 value |= (addrext << BCM43xx_DMA64_RXADDREXT_SHIFT)
708 & BCM43xx_DMA64_RXADDREXT_MASK;
709 bcm43xx_dma_write(ring, BCM43xx_DMA64_RXCTL, value);
710 bcm43xx_dma_write(ring, BCM43xx_DMA64_RXRINGLO,
711 (ringbase & 0xFFFFFFFF));
712 bcm43xx_dma_write(ring, BCM43xx_DMA64_RXRINGHI,
713 ((ringbase >> 32) & ~SSB_DMA_TRANSLATION_MASK)
714 | trans);
715 bcm43xx_dma_write(ring, BCM43xx_DMA64_RXINDEX, 200);
716 } else {
717 u32 ringbase = (u32)(ring->dmabase);
718
719 addrext = (ringbase & SSB_DMA_TRANSLATION_MASK)
720 >> SSB_DMA_TRANSLATION_SHIFT;
721 value = (ring->frameoffset << BCM43xx_DMA32_RXFROFF_SHIFT);
722 value |= BCM43xx_DMA32_RXENABLE;
723 value |= (addrext << BCM43xx_DMA32_RXADDREXT_SHIFT)
724 & BCM43xx_DMA32_RXADDREXT_MASK;
725 bcm43xx_dma_write(ring, BCM43xx_DMA32_RXCTL, value);
726 bcm43xx_dma_write(ring, BCM43xx_DMA32_RXRING,
727 (ringbase & ~SSB_DMA_TRANSLATION_MASK)
728 | trans);
729 bcm43xx_dma_write(ring, BCM43xx_DMA32_RXINDEX, 200);
730 }
731 }
732
733 out:
734 return err;
735 }
736
737 /* Shutdown the DMA controller. */
738 static void dmacontroller_cleanup(struct bcm43xx_dmaring *ring)
739 {
740 if (ring->tx) {
741 bcm43xx_dmacontroller_tx_reset(ring->dev, ring->mmio_base, ring->dma64);
742 if (ring->dma64) {
743 bcm43xx_dma_write(ring, BCM43xx_DMA64_TXRINGLO, 0);
744 bcm43xx_dma_write(ring, BCM43xx_DMA64_TXRINGHI, 0);
745 } else
746 bcm43xx_dma_write(ring, BCM43xx_DMA32_TXRING, 0);
747 } else {
748 bcm43xx_dmacontroller_rx_reset(ring->dev, ring->mmio_base, ring->dma64);
749 if (ring->dma64) {
750 bcm43xx_dma_write(ring, BCM43xx_DMA64_RXRINGLO, 0);
751 bcm43xx_dma_write(ring, BCM43xx_DMA64_RXRINGHI, 0);
752 } else
753 bcm43xx_dma_write(ring, BCM43xx_DMA32_RXRING, 0);
754 }
755 }
756
757 static void free_all_descbuffers(struct bcm43xx_dmaring *ring)
758 {
759 struct bcm43xx_dmadesc_generic *desc;
760 struct bcm43xx_dmadesc_meta *meta;
761 int i;
762
763 if (!ring->used_slots)
764 return;
765 for (i = 0; i < ring->nr_slots; i++) {
766 desc = ring->ops->idx2desc(ring, i, &meta);
767
768 if (!meta->skb) {
769 assert(ring->tx);
770 continue;
771 }
772 if (ring->tx) {
773 unmap_descbuffer(ring, meta->dmaaddr,
774 meta->skb->len, 1);
775 } else {
776 unmap_descbuffer(ring, meta->dmaaddr,
777 ring->rx_buffersize, 0);
778 }
779 free_descriptor_buffer(ring, meta, 0);
780 }
781 }
782
783 static u64 supported_dma_mask(struct bcm43xx_wldev *dev)
784 {
785 u32 tmp;
786 u16 mmio_base;
787
788 tmp = bcm43xx_read32(dev, SSB_TMSHIGH);
789 if (tmp & SSB_TMSHIGH_DMA64)
790 return DMA_64BIT_MASK;
791 mmio_base = bcm43xx_dmacontroller_base(0, 0);
792 bcm43xx_write32(dev,
793 mmio_base + BCM43xx_DMA32_TXCTL,
794 BCM43xx_DMA32_TXADDREXT_MASK);
795 tmp = bcm43xx_read32(dev,
796 mmio_base + BCM43xx_DMA32_TXCTL);
797 if (tmp & BCM43xx_DMA32_TXADDREXT_MASK)
798 return DMA_32BIT_MASK;
799
800 return DMA_30BIT_MASK;
801 }
802
803 /* Main initialization function. */
804 static
805 struct bcm43xx_dmaring * bcm43xx_setup_dmaring(struct bcm43xx_wldev *dev,
806 int controller_index,
807 int for_tx,
808 int dma64)
809 {
810 struct bcm43xx_dmaring *ring;
811 int err;
812 int nr_slots;
813 dma_addr_t dma_test;
814
815 ring = kzalloc(sizeof(*ring), GFP_KERNEL);
816 if (!ring)
817 goto out;
818
819 nr_slots = BCM43xx_RXRING_SLOTS;
820 if (for_tx)
821 nr_slots = BCM43xx_TXRING_SLOTS;
822
823 ring->meta = kcalloc(nr_slots, sizeof(struct bcm43xx_dmadesc_meta),
824 GFP_KERNEL);
825 if (!ring->meta)
826 goto err_kfree_ring;
827 if (for_tx) {
828 ring->txhdr_cache = kcalloc(nr_slots,
829 sizeof(struct bcm43xx_txhdr_fw4),
830 GFP_KERNEL);
831 if (!ring->txhdr_cache)
832 goto err_kfree_meta;
833
834 /* test for ability to dma to txhdr_cache */
835 dma_test = dma_map_single(dev->dev->dev,
836 ring->txhdr_cache, sizeof(struct bcm43xx_txhdr_fw4),
837 DMA_TO_DEVICE);
838
839 if (dma_mapping_error(dma_test)) {
840 /* ugh realloc */
841 kfree(ring->txhdr_cache);
842 ring->txhdr_cache = kcalloc(nr_slots,
843 sizeof(struct bcm43xx_txhdr_fw4),
844 GFP_KERNEL | GFP_DMA);
845 if (!ring->txhdr_cache)
846 goto err_kfree_meta;
847
848 dma_test = dma_map_single(dev->dev->dev,
849 ring->txhdr_cache, sizeof(struct bcm43xx_txhdr_fw4),
850 DMA_TO_DEVICE);
851
852 if (dma_mapping_error(dma_test))
853 goto err_kfree_txhdr_cache;
854 }
855
856 dma_unmap_single(dev->dev->dev,
857 dma_test, sizeof(struct bcm43xx_txhdr_fw4),
858 DMA_TO_DEVICE);
859 }
860
861 ring->dev = dev;
862 ring->nr_slots = nr_slots;
863 ring->mmio_base = bcm43xx_dmacontroller_base(dma64, controller_index);
864 ring->index = controller_index;
865 ring->dma64 = !!dma64;
866 if (dma64)
867 ring->ops = &dma64_ops;
868 else
869 ring->ops = &dma32_ops;
870 if (for_tx) {
871 ring->tx = 1;
872 ring->current_slot = -1;
873 } else {
874 if (ring->index == 0) {
875 ring->rx_buffersize = BCM43xx_DMA0_RX_BUFFERSIZE;
876 ring->frameoffset = BCM43xx_DMA0_RX_FRAMEOFFSET;
877 } else if (ring->index == 3) {
878 ring->rx_buffersize = BCM43xx_DMA3_RX_BUFFERSIZE;
879 ring->frameoffset = BCM43xx_DMA3_RX_FRAMEOFFSET;
880 } else
881 assert(0);
882 }
883 spin_lock_init(&ring->lock);
884 #ifdef CONFIG_BCM43XX_MAC80211_DEBUG
885 ring->last_injected_overflow = jiffies;
886 #endif
887
888 err = alloc_ringmemory(ring);
889 if (err)
890 goto err_kfree_txhdr_cache;
891 err = dmacontroller_setup(ring);
892 if (err)
893 goto err_free_ringmemory;
894
895 out:
896 return ring;
897
898 err_free_ringmemory:
899 free_ringmemory(ring);
900 err_kfree_txhdr_cache:
901 kfree(ring->txhdr_cache);
902 err_kfree_meta:
903 kfree(ring->meta);
904 err_kfree_ring:
905 kfree(ring);
906 ring = NULL;
907 goto out;
908 }
909
910 /* Main cleanup function. */
911 static void bcm43xx_destroy_dmaring(struct bcm43xx_dmaring *ring)
912 {
913 if (!ring)
914 return;
915
916 dprintk(KERN_INFO PFX "DMA-%s 0x%04X (%s) max used slots: %d/%d\n",
917 (ring->dma64) ? "64" : "32",
918 ring->mmio_base,
919 (ring->tx) ? "TX" : "RX",
920 ring->max_used_slots, ring->nr_slots);
921 /* Device IRQs are disabled prior entering this function,
922 * so no need to take care of concurrency with rx handler stuff.
923 */
924 dmacontroller_cleanup(ring);
925 free_all_descbuffers(ring);
926 free_ringmemory(ring);
927
928 kfree(ring->txhdr_cache);
929 kfree(ring->meta);
930 kfree(ring);
931 }
932
933 void bcm43xx_dma_free(struct bcm43xx_wldev *dev)
934 {
935 struct bcm43xx_dma *dma;
936
937 if (bcm43xx_using_pio(dev))
938 return;
939 dma = &dev->dma;
940
941 bcm43xx_destroy_dmaring(dma->rx_ring3);
942 dma->rx_ring3 = NULL;
943 bcm43xx_destroy_dmaring(dma->rx_ring0);
944 dma->rx_ring0 = NULL;
945
946 bcm43xx_destroy_dmaring(dma->tx_ring5);
947 dma->tx_ring5 = NULL;
948 bcm43xx_destroy_dmaring(dma->tx_ring4);
949 dma->tx_ring4 = NULL;
950 bcm43xx_destroy_dmaring(dma->tx_ring3);
951 dma->tx_ring3 = NULL;
952 bcm43xx_destroy_dmaring(dma->tx_ring2);
953 dma->tx_ring2 = NULL;
954 bcm43xx_destroy_dmaring(dma->tx_ring1);
955 dma->tx_ring1 = NULL;
956 bcm43xx_destroy_dmaring(dma->tx_ring0);
957 dma->tx_ring0 = NULL;
958 }
959
960 int bcm43xx_dma_init(struct bcm43xx_wldev *dev)
961 {
962 struct bcm43xx_dma *dma = &dev->dma;
963 struct bcm43xx_dmaring *ring;
964 int err;
965 u64 dmamask;
966 int dma64 = 0;
967
968 dmamask = supported_dma_mask(dev);
969 if (dmamask == DMA_64BIT_MASK)
970 dma64 = 1;
971
972 err = ssb_dma_set_mask(dev->dev, dmamask);
973 if (err) {
974 #ifdef BCM43XX_MAC80211_PIO
975 printk(KERN_WARNING PFX "DMA for this device not supported. "
976 "Falling back to PIO\n");
977 dev->__using_pio = 1;
978 return -EAGAIN;
979 #else
980 printk(KERN_ERR PFX "DMA for this device not supported and "
981 "no PIO support compiled in\n");
982 return -EOPNOTSUPP;
983 #endif
984 }
985
986 err = -ENOMEM;
987 /* setup TX DMA channels. */
988 ring = bcm43xx_setup_dmaring(dev, 0, 1, dma64);
989 if (!ring)
990 goto out;
991 dma->tx_ring0 = ring;
992
993 ring = bcm43xx_setup_dmaring(dev, 1, 1, dma64);
994 if (!ring)
995 goto err_destroy_tx0;
996 dma->tx_ring1 = ring;
997
998 ring = bcm43xx_setup_dmaring(dev, 2, 1, dma64);
999 if (!ring)
1000 goto err_destroy_tx1;
1001 dma->tx_ring2 = ring;
1002
1003 ring = bcm43xx_setup_dmaring(dev, 3, 1, dma64);
1004 if (!ring)
1005 goto err_destroy_tx2;
1006 dma->tx_ring3 = ring;
1007
1008 ring = bcm43xx_setup_dmaring(dev, 4, 1, dma64);
1009 if (!ring)
1010 goto err_destroy_tx3;
1011 dma->tx_ring4 = ring;
1012
1013 ring = bcm43xx_setup_dmaring(dev, 5, 1, dma64);
1014 if (!ring)
1015 goto err_destroy_tx4;
1016 dma->tx_ring5 = ring;
1017
1018 /* setup RX DMA channels. */
1019 ring = bcm43xx_setup_dmaring(dev, 0, 0, dma64);
1020 if (!ring)
1021 goto err_destroy_tx5;
1022 dma->rx_ring0 = ring;
1023
1024 if (dev->dev->id.revision < 5) {
1025 ring = bcm43xx_setup_dmaring(dev, 3, 0, dma64);
1026 if (!ring)
1027 goto err_destroy_rx0;
1028 dma->rx_ring3 = ring;
1029 }
1030
1031 dprintk(KERN_INFO PFX "%d-bit DMA initialized\n",
1032 (dmamask == DMA_64BIT_MASK) ? 64 :
1033 (dmamask == DMA_32BIT_MASK) ? 32 : 30);
1034 err = 0;
1035 out:
1036 return err;
1037
1038 err_destroy_rx0:
1039 bcm43xx_destroy_dmaring(dma->rx_ring0);
1040 dma->rx_ring0 = NULL;
1041 err_destroy_tx5:
1042 bcm43xx_destroy_dmaring(dma->tx_ring5);
1043 dma->tx_ring5 = NULL;
1044 err_destroy_tx4:
1045 bcm43xx_destroy_dmaring(dma->tx_ring4);
1046 dma->tx_ring4 = NULL;
1047 err_destroy_tx3:
1048 bcm43xx_destroy_dmaring(dma->tx_ring3);
1049 dma->tx_ring3 = NULL;
1050 err_destroy_tx2:
1051 bcm43xx_destroy_dmaring(dma->tx_ring2);
1052 dma->tx_ring2 = NULL;
1053 err_destroy_tx1:
1054 bcm43xx_destroy_dmaring(dma->tx_ring1);
1055 dma->tx_ring1 = NULL;
1056 err_destroy_tx0:
1057 bcm43xx_destroy_dmaring(dma->tx_ring0);
1058 dma->tx_ring0 = NULL;
1059 goto out;
1060 }
1061
1062 /* Generate a cookie for the TX header. */
1063 static u16 generate_cookie(struct bcm43xx_dmaring *ring,
1064 int slot)
1065 {
1066 u16 cookie = 0x1000;
1067
1068 /* Use the upper 4 bits of the cookie as
1069 * DMA controller ID and store the slot number
1070 * in the lower 12 bits.
1071 * Note that the cookie must never be 0, as this
1072 * is a special value used in RX path.
1073 */
1074 switch (ring->index) {
1075 case 0:
1076 cookie = 0xA000;
1077 break;
1078 case 1:
1079 cookie = 0xB000;
1080 break;
1081 case 2:
1082 cookie = 0xC000;
1083 break;
1084 case 3:
1085 cookie = 0xD000;
1086 break;
1087 case 4:
1088 cookie = 0xE000;
1089 break;
1090 case 5:
1091 cookie = 0xF000;
1092 break;
1093 }
1094 assert(((u16)slot & 0xF000) == 0x0000);
1095 cookie |= (u16)slot;
1096
1097 return cookie;
1098 }
1099
1100 /* Inspect a cookie and find out to which controller/slot it belongs. */
1101 static
1102 struct bcm43xx_dmaring * parse_cookie(struct bcm43xx_wldev *dev,
1103 u16 cookie, int *slot)
1104 {
1105 struct bcm43xx_dma *dma = &dev->dma;
1106 struct bcm43xx_dmaring *ring = NULL;
1107
1108 switch (cookie & 0xF000) {
1109 case 0xA000:
1110 ring = dma->tx_ring0;
1111 break;
1112 case 0xB000:
1113 ring = dma->tx_ring1;
1114 break;
1115 case 0xC000:
1116 ring = dma->tx_ring2;
1117 break;
1118 case 0xD000:
1119 ring = dma->tx_ring3;
1120 break;
1121 case 0xE000:
1122 ring = dma->tx_ring4;
1123 break;
1124 case 0xF000:
1125 ring = dma->tx_ring5;
1126 break;
1127 default:
1128 assert(0);
1129 }
1130 *slot = (cookie & 0x0FFF);
1131 assert(ring && *slot >= 0 && *slot < ring->nr_slots);
1132
1133 return ring;
1134 }
1135
1136 static int dma_tx_fragment(struct bcm43xx_dmaring *ring,
1137 struct sk_buff *skb,
1138 struct ieee80211_tx_control *ctl)
1139 {
1140 const struct bcm43xx_dma_ops *ops = ring->ops;
1141 u8 *header;
1142 int slot;
1143 int err;
1144 struct bcm43xx_dmadesc_generic *desc;
1145 struct bcm43xx_dmadesc_meta *meta;
1146 struct bcm43xx_dmadesc_meta *meta_hdr;
1147 struct sk_buff *bounce_skb;
1148
1149 #define SLOTS_PER_PACKET 2
1150 assert(skb_shinfo(skb)->nr_frags == 0);
1151
1152 /* Get a slot for the header. */
1153 slot = request_slot(ring);
1154 desc = ops->idx2desc(ring, slot, &meta_hdr);
1155 memset(meta_hdr, 0, sizeof(*meta_hdr));
1156
1157 header = &(ring->txhdr_cache[slot * sizeof(struct bcm43xx_txhdr_fw4)]);
1158 bcm43xx_generate_txhdr(ring->dev, header,
1159 skb->data, skb->len, ctl,
1160 generate_cookie(ring, slot));
1161
1162 meta_hdr->dmaaddr = map_descbuffer(ring, (unsigned char *)header,
1163 sizeof(struct bcm43xx_txhdr_fw4), 1);
1164 if (dma_mapping_error(meta_hdr->dmaaddr))
1165 return -EIO;
1166 ops->fill_descriptor(ring, desc, meta_hdr->dmaaddr,
1167 sizeof(struct bcm43xx_txhdr_fw4), 1, 0, 0);
1168
1169 /* Get a slot for the payload. */
1170 slot = request_slot(ring);
1171 desc = ops->idx2desc(ring, slot, &meta);
1172 memset(meta, 0, sizeof(*meta));
1173
1174 memcpy(&meta->txstat.control, ctl, sizeof(*ctl));
1175 meta->skb = skb;
1176 meta->is_last_fragment = 1;
1177
1178 meta->dmaaddr = map_descbuffer(ring, skb->data, skb->len, 1);
1179 /* create a bounce buffer in zone_dma on mapping failure. */
1180 if (dma_mapping_error(meta->dmaaddr)) {
1181 bounce_skb = __dev_alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA);
1182 if (!bounce_skb) {
1183 err = -ENOMEM;
1184 goto out_unmap_hdr;
1185 }
1186
1187 memcpy(skb_put(bounce_skb, skb->len), skb->data, skb->len);
1188 dev_kfree_skb_any(skb);
1189 skb = bounce_skb;
1190 meta->skb = skb;
1191 meta->dmaaddr = map_descbuffer(ring, skb->data, skb->len, 1);
1192 if (dma_mapping_error(meta->dmaaddr)) {
1193 err = -EIO;
1194 goto out_free_bounce;
1195 }
1196 }
1197
1198 ops->fill_descriptor(ring, desc, meta->dmaaddr,
1199 skb->len, 0, 1, 1);
1200
1201 /* Now transfer the whole frame. */
1202 wmb();
1203 ops->poke_tx(ring, next_slot(ring, slot));
1204 return 0;
1205
1206 out_free_bounce:
1207 dev_kfree_skb_any(skb);
1208 out_unmap_hdr:
1209 unmap_descbuffer(ring, meta_hdr->dmaaddr,
1210 sizeof(struct bcm43xx_txhdr_fw4), 1);
1211 return err;
1212 }
1213
1214 static inline
1215 int should_inject_overflow(struct bcm43xx_dmaring *ring)
1216 {
1217 #ifdef CONFIG_BCM43XX_MAC80211_DEBUG
1218 if (unlikely(bcm43xx_debug(ring->dev, BCM43xx_DBG_DMAOVERFLOW))) {
1219 /* Check if we should inject another ringbuffer overflow
1220 * to test handling of this situation in the stack. */
1221 unsigned long next_overflow;
1222
1223 next_overflow = ring->last_injected_overflow + HZ;
1224 if (time_after(jiffies, next_overflow)) {
1225 ring->last_injected_overflow = jiffies;
1226 dprintk(KERN_DEBUG PFX "Injecting TX ring overflow on "
1227 "DMA controller %d\n", ring->index);
1228 return 1;
1229 }
1230 }
1231 #endif /* CONFIG_BCM43XX_MAC80211_DEBUG */
1232 return 0;
1233 }
1234
1235 int bcm43xx_dma_tx(struct bcm43xx_wldev *dev,
1236 struct sk_buff *skb,
1237 struct ieee80211_tx_control *ctl)
1238 {
1239 struct bcm43xx_dmaring *ring;
1240 int err = 0;
1241 unsigned long flags;
1242
1243 ring = priority_to_txring(dev, ctl->queue);
1244 spin_lock_irqsave(&ring->lock, flags);
1245 assert(ring->tx);
1246 if (unlikely(free_slots(ring) < SLOTS_PER_PACKET)) {
1247 printkl(KERN_ERR PFX "DMA queue overflow\n");
1248 err = -ENOSPC;
1249 goto out_unlock;
1250 }
1251 /* Check if the queue was stopped in mac80211,
1252 * but we got called nevertheless.
1253 * That would be a mac80211 bug. */
1254 assert(!ring->stopped);
1255
1256 err = dma_tx_fragment(ring, skb, ctl);
1257 if (unlikely(err)) {
1258 printkl(KERN_ERR PFX "DMA tx mapping failure\n");
1259 goto out_unlock;
1260 }
1261 ring->nr_tx_packets++;
1262 if ((free_slots(ring) < SLOTS_PER_PACKET) ||
1263 should_inject_overflow(ring)) {
1264 /* This TX ring is full. */
1265 ieee80211_stop_queue(dev->wl->hw, txring_to_priority(ring));
1266 ring->stopped = 1;
1267 if (bcm43xx_debug(dev, BCM43xx_DBG_DMAVERBOSE)) {
1268 dprintk(KERN_DEBUG PFX "Stopped TX ring %d\n",
1269 ring->index);
1270 }
1271 }
1272 out_unlock:
1273 spin_unlock_irqrestore(&ring->lock, flags);
1274
1275 return err;
1276 }
1277
1278 void bcm43xx_dma_handle_txstatus(struct bcm43xx_wldev *dev,
1279 const struct bcm43xx_txstatus *status)
1280 {
1281 const struct bcm43xx_dma_ops *ops;
1282 struct bcm43xx_dmaring *ring;
1283 struct bcm43xx_dmadesc_generic *desc;
1284 struct bcm43xx_dmadesc_meta *meta;
1285 int slot;
1286
1287 ring = parse_cookie(dev, status->cookie, &slot);
1288 if (unlikely(!ring))
1289 return;
1290 assert(irqs_disabled());
1291 spin_lock(&ring->lock);
1292
1293 assert(ring->tx);
1294 ops = ring->ops;
1295 while (1) {
1296 assert(slot >= 0 && slot < ring->nr_slots);
1297 desc = ops->idx2desc(ring, slot, &meta);
1298
1299 if (meta->skb)
1300 unmap_descbuffer(ring, meta->dmaaddr, meta->skb->len, 1);
1301 else
1302 unmap_descbuffer(ring, meta->dmaaddr, sizeof(struct bcm43xx_txhdr_fw4), 1);
1303
1304 if (meta->is_last_fragment) {
1305 assert(meta->skb);
1306 /* Call back to inform the ieee80211 subsystem about the
1307 * status of the transmission.
1308 * Some fields of txstat are already filled in dma_tx().
1309 */
1310 if (status->acked)
1311 meta->txstat.flags |= IEEE80211_TX_STATUS_ACK;
1312 meta->txstat.retry_count = status->frame_count - 1;
1313 ieee80211_tx_status_irqsafe(dev->wl->hw, meta->skb, &(meta->txstat));
1314 /* skb is freed by ieee80211_tx_status_irqsafe() */
1315 meta->skb = NULL;
1316 } else {
1317 /* No need to call free_descriptor_buffer here, as
1318 * this is only the txhdr, which is not allocated.
1319 */
1320 assert(meta->skb == NULL);
1321 }
1322
1323 /* Everything unmapped and free'd. So it's not used anymore. */
1324 ring->used_slots--;
1325
1326 if (meta->is_last_fragment)
1327 break;
1328 slot = next_slot(ring, slot);
1329 }
1330 dev->stats.last_tx = jiffies;
1331 if (ring->stopped) {
1332 assert(free_slots(ring) >= SLOTS_PER_PACKET);
1333 ieee80211_wake_queue(dev->wl->hw, txring_to_priority(ring));
1334 ring->stopped = 0;
1335 if (bcm43xx_debug(dev, BCM43xx_DBG_DMAVERBOSE)) {
1336 dprintk(KERN_DEBUG PFX "Woke up TX ring %d\n",
1337 ring->index);
1338 }
1339 }
1340
1341 spin_unlock(&ring->lock);
1342 }
1343
1344 void bcm43xx_dma_get_tx_stats(struct bcm43xx_wldev *dev,
1345 struct ieee80211_tx_queue_stats *stats)
1346 {
1347 const int nr_queues = dev->wl->hw->queues;
1348 struct bcm43xx_dmaring *ring;
1349 struct ieee80211_tx_queue_stats_data *data;
1350 unsigned long flags;
1351 int i;
1352
1353 for (i = 0; i < nr_queues; i++) {
1354 data = &(stats->data[i]);
1355 ring = priority_to_txring(dev, i);
1356
1357 spin_lock_irqsave(&ring->lock, flags);
1358 data->len = ring->used_slots / SLOTS_PER_PACKET;
1359 data->limit = ring->nr_slots / SLOTS_PER_PACKET;
1360 data->count = ring->nr_tx_packets;
1361 spin_unlock_irqrestore(&ring->lock, flags);
1362 }
1363 }
1364
1365 static void dma_rx(struct bcm43xx_dmaring *ring,
1366 int *slot)
1367 {
1368 const struct bcm43xx_dma_ops *ops = ring->ops;
1369 struct bcm43xx_dmadesc_generic *desc;
1370 struct bcm43xx_dmadesc_meta *meta;
1371 struct bcm43xx_rxhdr_fw4 *rxhdr;
1372 struct sk_buff *skb;
1373 u16 len;
1374 int err;
1375 dma_addr_t dmaaddr;
1376
1377 desc = ops->idx2desc(ring, *slot, &meta);
1378
1379 sync_descbuffer_for_cpu(ring, meta->dmaaddr, ring->rx_buffersize);
1380 skb = meta->skb;
1381
1382 if (ring->index == 3) {
1383 /* We received an xmit status. */
1384 struct bcm43xx_hwtxstatus *hw = (struct bcm43xx_hwtxstatus *)skb->data;
1385 int i = 0;
1386
1387 while (hw->cookie == 0) {
1388 if (i > 100)
1389 break;
1390 i++;
1391 udelay(2);
1392 barrier();
1393 }
1394 bcm43xx_handle_hwtxstatus(ring->dev, hw);
1395 /* recycle the descriptor buffer. */
1396 sync_descbuffer_for_device(ring, meta->dmaaddr, ring->rx_buffersize);
1397
1398 return;
1399 }
1400 rxhdr = (struct bcm43xx_rxhdr_fw4 *)skb->data;
1401 len = le16_to_cpu(rxhdr->frame_len);
1402 if (len == 0) {
1403 int i = 0;
1404
1405 do {
1406 udelay(2);
1407 barrier();
1408 len = le16_to_cpu(rxhdr->frame_len);
1409 } while (len == 0 && i++ < 5);
1410 if (unlikely(len == 0)) {
1411 /* recycle the descriptor buffer. */
1412 sync_descbuffer_for_device(ring, meta->dmaaddr,
1413 ring->rx_buffersize);
1414 goto drop;
1415 }
1416 }
1417 if (unlikely(len > ring->rx_buffersize)) {
1418 /* The data did not fit into one descriptor buffer
1419 * and is split over multiple buffers.
1420 * This should never happen, as we try to allocate buffers
1421 * big enough. So simply ignore this packet.
1422 */
1423 int cnt = 0;
1424 s32 tmp = len;
1425
1426 while (1) {
1427 desc = ops->idx2desc(ring, *slot, &meta);
1428 /* recycle the descriptor buffer. */
1429 sync_descbuffer_for_device(ring, meta->dmaaddr,
1430 ring->rx_buffersize);
1431 *slot = next_slot(ring, *slot);
1432 cnt++;
1433 tmp -= ring->rx_buffersize;
1434 if (tmp <= 0)
1435 break;
1436 }
1437 printkl(KERN_ERR PFX "DMA RX buffer too small "
1438 "(len: %u, buffer: %u, nr-dropped: %d)\n",
1439 len, ring->rx_buffersize, cnt);
1440 goto drop;
1441 }
1442
1443 dmaaddr = meta->dmaaddr;
1444 err = setup_rx_descbuffer(ring, desc, meta, GFP_ATOMIC);
1445 if (unlikely(err)) {
1446 dprintkl(KERN_ERR PFX "DMA RX: setup_rx_descbuffer() failed\n");
1447 sync_descbuffer_for_device(ring, dmaaddr,
1448 ring->rx_buffersize);
1449 goto drop;
1450 }
1451
1452 unmap_descbuffer(ring, dmaaddr, ring->rx_buffersize, 0);
1453 skb_put(skb, len + ring->frameoffset);
1454 skb_pull(skb, ring->frameoffset);
1455
1456 bcm43xx_rx(ring->dev, skb, rxhdr);
1457 drop:
1458 return;
1459 }
1460
1461 void bcm43xx_dma_rx(struct bcm43xx_dmaring *ring)
1462 {
1463 const struct bcm43xx_dma_ops *ops = ring->ops;
1464 int slot, current_slot;
1465 int used_slots = 0;
1466
1467 assert(!ring->tx);
1468 current_slot = ops->get_current_rxslot(ring);
1469 assert(current_slot >= 0 && current_slot < ring->nr_slots);
1470
1471 slot = ring->current_slot;
1472 for ( ; slot != current_slot; slot = next_slot(ring, slot)) {
1473 dma_rx(ring, &slot);
1474 update_max_used_slots(ring, ++used_slots);
1475 }
1476 ops->set_current_rxslot(ring, slot);
1477 ring->current_slot = slot;
1478 }
1479
1480 static void bcm43xx_dma_tx_suspend_ring(struct bcm43xx_dmaring *ring)
1481 {
1482 unsigned long flags;
1483
1484 spin_lock_irqsave(&ring->lock, flags);
1485 assert(ring->tx);
1486 ring->ops->tx_suspend(ring);
1487 spin_unlock_irqrestore(&ring->lock, flags);
1488 }
1489
1490 static void bcm43xx_dma_tx_resume_ring(struct bcm43xx_dmaring *ring)
1491 {
1492 unsigned long flags;
1493
1494 spin_lock_irqsave(&ring->lock, flags);
1495 assert(ring->tx);
1496 ring->ops->tx_resume(ring);
1497 spin_unlock_irqrestore(&ring->lock, flags);
1498 }
1499
1500 void bcm43xx_dma_tx_suspend(struct bcm43xx_wldev *dev)
1501 {
1502 bcm43xx_power_saving_ctl_bits(dev, -1, 1);
1503 bcm43xx_dma_tx_suspend_ring(dev->dma.tx_ring0);
1504 bcm43xx_dma_tx_suspend_ring(dev->dma.tx_ring1);
1505 bcm43xx_dma_tx_suspend_ring(dev->dma.tx_ring2);
1506 bcm43xx_dma_tx_suspend_ring(dev->dma.tx_ring3);
1507 bcm43xx_dma_tx_suspend_ring(dev->dma.tx_ring4);
1508 bcm43xx_dma_tx_suspend_ring(dev->dma.tx_ring5);
1509 }
1510
1511 void bcm43xx_dma_tx_resume(struct bcm43xx_wldev *dev)
1512 {
1513 bcm43xx_dma_tx_resume_ring(dev->dma.tx_ring5);
1514 bcm43xx_dma_tx_resume_ring(dev->dma.tx_ring4);
1515 bcm43xx_dma_tx_resume_ring(dev->dma.tx_ring3);
1516 bcm43xx_dma_tx_resume_ring(dev->dma.tx_ring2);
1517 bcm43xx_dma_tx_resume_ring(dev->dma.tx_ring1);
1518 bcm43xx_dma_tx_resume_ring(dev->dma.tx_ring0);
1519 bcm43xx_power_saving_ctl_bits(dev, -1, -1);
1520 }
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