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75388acd LF |
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 | u16 b43legacy_dmacontroller_base(int dma64bit, int controller_idx) | |
358 | { | |
359 | static const u16 map64[] = { | |
360 | B43legacy_MMIO_DMA64_BASE0, | |
361 | B43legacy_MMIO_DMA64_BASE1, | |
362 | B43legacy_MMIO_DMA64_BASE2, | |
363 | B43legacy_MMIO_DMA64_BASE3, | |
364 | B43legacy_MMIO_DMA64_BASE4, | |
365 | B43legacy_MMIO_DMA64_BASE5, | |
366 | }; | |
367 | static const u16 map32[] = { | |
368 | B43legacy_MMIO_DMA32_BASE0, | |
369 | B43legacy_MMIO_DMA32_BASE1, | |
370 | B43legacy_MMIO_DMA32_BASE2, | |
371 | B43legacy_MMIO_DMA32_BASE3, | |
372 | B43legacy_MMIO_DMA32_BASE4, | |
373 | B43legacy_MMIO_DMA32_BASE5, | |
374 | }; | |
375 | ||
376 | if (dma64bit) { | |
377 | B43legacy_WARN_ON(!(controller_idx >= 0 && | |
378 | controller_idx < ARRAY_SIZE(map64))); | |
379 | return map64[controller_idx]; | |
380 | } | |
381 | B43legacy_WARN_ON(!(controller_idx >= 0 && | |
382 | controller_idx < ARRAY_SIZE(map32))); | |
383 | return map32[controller_idx]; | |
384 | } | |
385 | ||
386 | static inline | |
387 | dma_addr_t map_descbuffer(struct b43legacy_dmaring *ring, | |
388 | unsigned char *buf, | |
389 | size_t len, | |
390 | int tx) | |
391 | { | |
392 | dma_addr_t dmaaddr; | |
393 | ||
394 | if (tx) | |
395 | dmaaddr = dma_map_single(ring->dev->dev->dev, | |
396 | buf, len, | |
397 | DMA_TO_DEVICE); | |
398 | else | |
399 | dmaaddr = dma_map_single(ring->dev->dev->dev, | |
400 | buf, len, | |
401 | DMA_FROM_DEVICE); | |
402 | ||
403 | return dmaaddr; | |
404 | } | |
405 | ||
406 | static inline | |
407 | void unmap_descbuffer(struct b43legacy_dmaring *ring, | |
408 | dma_addr_t addr, | |
409 | size_t len, | |
410 | int tx) | |
411 | { | |
412 | if (tx) | |
413 | dma_unmap_single(ring->dev->dev->dev, | |
414 | addr, len, | |
415 | DMA_TO_DEVICE); | |
416 | else | |
417 | dma_unmap_single(ring->dev->dev->dev, | |
418 | addr, len, | |
419 | DMA_FROM_DEVICE); | |
420 | } | |
421 | ||
422 | static inline | |
423 | void sync_descbuffer_for_cpu(struct b43legacy_dmaring *ring, | |
424 | dma_addr_t addr, | |
425 | size_t len) | |
426 | { | |
427 | B43legacy_WARN_ON(ring->tx); | |
428 | ||
429 | dma_sync_single_for_cpu(ring->dev->dev->dev, | |
430 | addr, len, DMA_FROM_DEVICE); | |
431 | } | |
432 | ||
433 | static inline | |
434 | void sync_descbuffer_for_device(struct b43legacy_dmaring *ring, | |
435 | dma_addr_t addr, | |
436 | size_t len) | |
437 | { | |
438 | B43legacy_WARN_ON(ring->tx); | |
439 | ||
440 | dma_sync_single_for_device(ring->dev->dev->dev, | |
441 | addr, len, DMA_FROM_DEVICE); | |
442 | } | |
443 | ||
444 | static inline | |
445 | void free_descriptor_buffer(struct b43legacy_dmaring *ring, | |
446 | struct b43legacy_dmadesc_meta *meta, | |
447 | int irq_context) | |
448 | { | |
449 | if (meta->skb) { | |
450 | if (irq_context) | |
451 | dev_kfree_skb_irq(meta->skb); | |
452 | else | |
453 | dev_kfree_skb(meta->skb); | |
454 | meta->skb = NULL; | |
455 | } | |
456 | } | |
457 | ||
458 | static int alloc_ringmemory(struct b43legacy_dmaring *ring) | |
459 | { | |
460 | struct device *dev = ring->dev->dev->dev; | |
461 | ||
462 | ring->descbase = dma_alloc_coherent(dev, B43legacy_DMA_RINGMEMSIZE, | |
463 | &(ring->dmabase), GFP_KERNEL); | |
464 | if (!ring->descbase) { | |
465 | b43legacyerr(ring->dev->wl, "DMA ringmemory allocation" | |
466 | " failed\n"); | |
467 | return -ENOMEM; | |
468 | } | |
469 | memset(ring->descbase, 0, B43legacy_DMA_RINGMEMSIZE); | |
470 | ||
471 | return 0; | |
472 | } | |
473 | ||
474 | static void free_ringmemory(struct b43legacy_dmaring *ring) | |
475 | { | |
476 | struct device *dev = ring->dev->dev->dev; | |
477 | ||
478 | dma_free_coherent(dev, B43legacy_DMA_RINGMEMSIZE, | |
479 | ring->descbase, ring->dmabase); | |
480 | } | |
481 | ||
482 | /* Reset the RX DMA channel */ | |
483 | int b43legacy_dmacontroller_rx_reset(struct b43legacy_wldev *dev, | |
484 | u16 mmio_base, int dma64) | |
485 | { | |
486 | int i; | |
487 | u32 value; | |
488 | u16 offset; | |
489 | ||
490 | might_sleep(); | |
491 | ||
492 | offset = dma64 ? B43legacy_DMA64_RXCTL : B43legacy_DMA32_RXCTL; | |
493 | b43legacy_write32(dev, mmio_base + offset, 0); | |
494 | for (i = 0; i < 10; i++) { | |
495 | offset = dma64 ? B43legacy_DMA64_RXSTATUS : | |
496 | B43legacy_DMA32_RXSTATUS; | |
497 | value = b43legacy_read32(dev, mmio_base + offset); | |
498 | if (dma64) { | |
499 | value &= B43legacy_DMA64_RXSTAT; | |
500 | if (value == B43legacy_DMA64_RXSTAT_DISABLED) { | |
501 | i = -1; | |
502 | break; | |
503 | } | |
504 | } else { | |
505 | value &= B43legacy_DMA32_RXSTATE; | |
506 | if (value == B43legacy_DMA32_RXSTAT_DISABLED) { | |
507 | i = -1; | |
508 | break; | |
509 | } | |
510 | } | |
511 | msleep(1); | |
512 | } | |
513 | if (i != -1) { | |
514 | b43legacyerr(dev->wl, "DMA RX reset timed out\n"); | |
515 | return -ENODEV; | |
516 | } | |
517 | ||
518 | return 0; | |
519 | } | |
520 | ||
521 | /* Reset the RX DMA channel */ | |
522 | int b43legacy_dmacontroller_tx_reset(struct b43legacy_wldev *dev, | |
523 | u16 mmio_base, int dma64) | |
524 | { | |
525 | int i; | |
526 | u32 value; | |
527 | u16 offset; | |
528 | ||
529 | might_sleep(); | |
530 | ||
531 | for (i = 0; i < 10; i++) { | |
532 | offset = dma64 ? B43legacy_DMA64_TXSTATUS : | |
533 | B43legacy_DMA32_TXSTATUS; | |
534 | value = b43legacy_read32(dev, mmio_base + offset); | |
535 | if (dma64) { | |
536 | value &= B43legacy_DMA64_TXSTAT; | |
537 | if (value == B43legacy_DMA64_TXSTAT_DISABLED || | |
538 | value == B43legacy_DMA64_TXSTAT_IDLEWAIT || | |
539 | value == B43legacy_DMA64_TXSTAT_STOPPED) | |
540 | break; | |
541 | } else { | |
542 | value &= B43legacy_DMA32_TXSTATE; | |
543 | if (value == B43legacy_DMA32_TXSTAT_DISABLED || | |
544 | value == B43legacy_DMA32_TXSTAT_IDLEWAIT || | |
545 | value == B43legacy_DMA32_TXSTAT_STOPPED) | |
546 | break; | |
547 | } | |
548 | msleep(1); | |
549 | } | |
550 | offset = dma64 ? B43legacy_DMA64_TXCTL : B43legacy_DMA32_TXCTL; | |
551 | b43legacy_write32(dev, mmio_base + offset, 0); | |
552 | for (i = 0; i < 10; i++) { | |
553 | offset = dma64 ? B43legacy_DMA64_TXSTATUS : | |
554 | B43legacy_DMA32_TXSTATUS; | |
555 | value = b43legacy_read32(dev, mmio_base + offset); | |
556 | if (dma64) { | |
557 | value &= B43legacy_DMA64_TXSTAT; | |
558 | if (value == B43legacy_DMA64_TXSTAT_DISABLED) { | |
559 | i = -1; | |
560 | break; | |
561 | } | |
562 | } else { | |
563 | value &= B43legacy_DMA32_TXSTATE; | |
564 | if (value == B43legacy_DMA32_TXSTAT_DISABLED) { | |
565 | i = -1; | |
566 | break; | |
567 | } | |
568 | } | |
569 | msleep(1); | |
570 | } | |
571 | if (i != -1) { | |
572 | b43legacyerr(dev->wl, "DMA TX reset timed out\n"); | |
573 | return -ENODEV; | |
574 | } | |
575 | /* ensure the reset is completed. */ | |
576 | msleep(1); | |
577 | ||
578 | return 0; | |
579 | } | |
580 | ||
581 | static int setup_rx_descbuffer(struct b43legacy_dmaring *ring, | |
582 | struct b43legacy_dmadesc_generic *desc, | |
583 | struct b43legacy_dmadesc_meta *meta, | |
584 | gfp_t gfp_flags) | |
585 | { | |
586 | struct b43legacy_rxhdr_fw3 *rxhdr; | |
587 | struct b43legacy_hwtxstatus *txstat; | |
588 | dma_addr_t dmaaddr; | |
589 | struct sk_buff *skb; | |
590 | ||
591 | B43legacy_WARN_ON(ring->tx); | |
592 | ||
593 | skb = __dev_alloc_skb(ring->rx_buffersize, gfp_flags); | |
594 | if (unlikely(!skb)) | |
595 | return -ENOMEM; | |
596 | dmaaddr = map_descbuffer(ring, skb->data, | |
597 | ring->rx_buffersize, 0); | |
598 | if (dma_mapping_error(dmaaddr)) { | |
599 | /* ugh. try to realloc in zone_dma */ | |
600 | gfp_flags |= GFP_DMA; | |
601 | ||
602 | dev_kfree_skb_any(skb); | |
603 | ||
604 | skb = __dev_alloc_skb(ring->rx_buffersize, gfp_flags); | |
605 | if (unlikely(!skb)) | |
606 | return -ENOMEM; | |
607 | dmaaddr = map_descbuffer(ring, skb->data, | |
608 | ring->rx_buffersize, 0); | |
609 | } | |
610 | ||
611 | if (dma_mapping_error(dmaaddr)) { | |
612 | dev_kfree_skb_any(skb); | |
613 | return -EIO; | |
614 | } | |
615 | ||
616 | meta->skb = skb; | |
617 | meta->dmaaddr = dmaaddr; | |
618 | ring->ops->fill_descriptor(ring, desc, dmaaddr, | |
619 | ring->rx_buffersize, 0, 0, 0); | |
620 | ||
621 | rxhdr = (struct b43legacy_rxhdr_fw3 *)(skb->data); | |
622 | rxhdr->frame_len = 0; | |
623 | txstat = (struct b43legacy_hwtxstatus *)(skb->data); | |
624 | txstat->cookie = 0; | |
625 | ||
626 | return 0; | |
627 | } | |
628 | ||
629 | /* Allocate the initial descbuffers. | |
630 | * This is used for an RX ring only. | |
631 | */ | |
632 | static int alloc_initial_descbuffers(struct b43legacy_dmaring *ring) | |
633 | { | |
634 | int i; | |
635 | int err = -ENOMEM; | |
636 | struct b43legacy_dmadesc_generic *desc; | |
637 | struct b43legacy_dmadesc_meta *meta; | |
638 | ||
639 | for (i = 0; i < ring->nr_slots; i++) { | |
640 | desc = ring->ops->idx2desc(ring, i, &meta); | |
641 | ||
642 | err = setup_rx_descbuffer(ring, desc, meta, GFP_KERNEL); | |
643 | if (err) { | |
644 | b43legacyerr(ring->dev->wl, | |
645 | "Failed to allocate initial descbuffers\n"); | |
646 | goto err_unwind; | |
647 | } | |
648 | } | |
649 | mb(); /* all descbuffer setup before next line */ | |
650 | ring->used_slots = ring->nr_slots; | |
651 | err = 0; | |
652 | out: | |
653 | return err; | |
654 | ||
655 | err_unwind: | |
656 | for (i--; i >= 0; i--) { | |
657 | desc = ring->ops->idx2desc(ring, i, &meta); | |
658 | ||
659 | unmap_descbuffer(ring, meta->dmaaddr, ring->rx_buffersize, 0); | |
660 | dev_kfree_skb(meta->skb); | |
661 | } | |
662 | goto out; | |
663 | } | |
664 | ||
665 | /* Do initial setup of the DMA controller. | |
666 | * Reset the controller, write the ring busaddress | |
667 | * and switch the "enable" bit on. | |
668 | */ | |
669 | static int dmacontroller_setup(struct b43legacy_dmaring *ring) | |
670 | { | |
671 | int err = 0; | |
672 | u32 value; | |
673 | u32 addrext; | |
674 | u32 trans = ssb_dma_translation(ring->dev->dev); | |
675 | ||
676 | if (ring->tx) { | |
677 | if (ring->dma64) { | |
678 | u64 ringbase = (u64)(ring->dmabase); | |
679 | ||
680 | addrext = ((ringbase >> 32) & SSB_DMA_TRANSLATION_MASK) | |
681 | >> SSB_DMA_TRANSLATION_SHIFT; | |
682 | value = B43legacy_DMA64_TXENABLE; | |
683 | value |= (addrext << B43legacy_DMA64_TXADDREXT_SHIFT) | |
684 | & B43legacy_DMA64_TXADDREXT_MASK; | |
685 | b43legacy_dma_write(ring, B43legacy_DMA64_TXCTL, | |
686 | value); | |
687 | b43legacy_dma_write(ring, B43legacy_DMA64_TXRINGLO, | |
688 | (ringbase & 0xFFFFFFFF)); | |
689 | b43legacy_dma_write(ring, B43legacy_DMA64_TXRINGHI, | |
690 | ((ringbase >> 32) | |
691 | & ~SSB_DMA_TRANSLATION_MASK) | |
692 | | trans); | |
693 | } else { | |
694 | u32 ringbase = (u32)(ring->dmabase); | |
695 | ||
696 | addrext = (ringbase & SSB_DMA_TRANSLATION_MASK) | |
697 | >> SSB_DMA_TRANSLATION_SHIFT; | |
698 | value = B43legacy_DMA32_TXENABLE; | |
699 | value |= (addrext << B43legacy_DMA32_TXADDREXT_SHIFT) | |
700 | & B43legacy_DMA32_TXADDREXT_MASK; | |
701 | b43legacy_dma_write(ring, B43legacy_DMA32_TXCTL, | |
702 | value); | |
703 | b43legacy_dma_write(ring, B43legacy_DMA32_TXRING, | |
704 | (ringbase & | |
705 | ~SSB_DMA_TRANSLATION_MASK) | |
706 | | trans); | |
707 | } | |
708 | } else { | |
709 | err = alloc_initial_descbuffers(ring); | |
710 | if (err) | |
711 | goto out; | |
712 | if (ring->dma64) { | |
713 | u64 ringbase = (u64)(ring->dmabase); | |
714 | ||
715 | addrext = ((ringbase >> 32) & SSB_DMA_TRANSLATION_MASK) | |
716 | >> SSB_DMA_TRANSLATION_SHIFT; | |
717 | value = (ring->frameoffset << | |
718 | B43legacy_DMA64_RXFROFF_SHIFT); | |
719 | value |= B43legacy_DMA64_RXENABLE; | |
720 | value |= (addrext << B43legacy_DMA64_RXADDREXT_SHIFT) | |
721 | & B43legacy_DMA64_RXADDREXT_MASK; | |
722 | b43legacy_dma_write(ring, B43legacy_DMA64_RXCTL, | |
723 | value); | |
724 | b43legacy_dma_write(ring, B43legacy_DMA64_RXRINGLO, | |
725 | (ringbase & 0xFFFFFFFF)); | |
726 | b43legacy_dma_write(ring, B43legacy_DMA64_RXRINGHI, | |
727 | ((ringbase >> 32) & | |
728 | ~SSB_DMA_TRANSLATION_MASK) | | |
729 | trans); | |
730 | b43legacy_dma_write(ring, B43legacy_DMA64_RXINDEX, | |
731 | 200); | |
732 | } else { | |
733 | u32 ringbase = (u32)(ring->dmabase); | |
734 | ||
735 | addrext = (ringbase & SSB_DMA_TRANSLATION_MASK) | |
736 | >> SSB_DMA_TRANSLATION_SHIFT; | |
737 | value = (ring->frameoffset << | |
738 | B43legacy_DMA32_RXFROFF_SHIFT); | |
739 | value |= B43legacy_DMA32_RXENABLE; | |
740 | value |= (addrext << | |
741 | B43legacy_DMA32_RXADDREXT_SHIFT) | |
742 | & B43legacy_DMA32_RXADDREXT_MASK; | |
743 | b43legacy_dma_write(ring, B43legacy_DMA32_RXCTL, | |
744 | value); | |
745 | b43legacy_dma_write(ring, B43legacy_DMA32_RXRING, | |
746 | (ringbase & | |
747 | ~SSB_DMA_TRANSLATION_MASK) | |
748 | | trans); | |
749 | b43legacy_dma_write(ring, B43legacy_DMA32_RXINDEX, | |
750 | 200); | |
751 | } | |
752 | } | |
753 | ||
754 | out: | |
755 | return err; | |
756 | } | |
757 | ||
758 | /* Shutdown the DMA controller. */ | |
759 | static void dmacontroller_cleanup(struct b43legacy_dmaring *ring) | |
760 | { | |
761 | if (ring->tx) { | |
762 | b43legacy_dmacontroller_tx_reset(ring->dev, ring->mmio_base, | |
763 | ring->dma64); | |
764 | if (ring->dma64) { | |
765 | b43legacy_dma_write(ring, B43legacy_DMA64_TXRINGLO, 0); | |
766 | b43legacy_dma_write(ring, B43legacy_DMA64_TXRINGHI, 0); | |
767 | } else | |
768 | b43legacy_dma_write(ring, B43legacy_DMA32_TXRING, 0); | |
769 | } else { | |
770 | b43legacy_dmacontroller_rx_reset(ring->dev, ring->mmio_base, | |
771 | ring->dma64); | |
772 | if (ring->dma64) { | |
773 | b43legacy_dma_write(ring, B43legacy_DMA64_RXRINGLO, 0); | |
774 | b43legacy_dma_write(ring, B43legacy_DMA64_RXRINGHI, 0); | |
775 | } else | |
776 | b43legacy_dma_write(ring, B43legacy_DMA32_RXRING, 0); | |
777 | } | |
778 | } | |
779 | ||
780 | static void free_all_descbuffers(struct b43legacy_dmaring *ring) | |
781 | { | |
782 | struct b43legacy_dmadesc_generic *desc; | |
783 | struct b43legacy_dmadesc_meta *meta; | |
784 | int i; | |
785 | ||
786 | if (!ring->used_slots) | |
787 | return; | |
788 | for (i = 0; i < ring->nr_slots; i++) { | |
789 | desc = ring->ops->idx2desc(ring, i, &meta); | |
790 | ||
791 | if (!meta->skb) { | |
792 | B43legacy_WARN_ON(!ring->tx); | |
793 | continue; | |
794 | } | |
795 | if (ring->tx) | |
796 | unmap_descbuffer(ring, meta->dmaaddr, | |
797 | meta->skb->len, 1); | |
798 | else | |
799 | unmap_descbuffer(ring, meta->dmaaddr, | |
800 | ring->rx_buffersize, 0); | |
801 | free_descriptor_buffer(ring, meta, 0); | |
802 | } | |
803 | } | |
804 | ||
805 | static u64 supported_dma_mask(struct b43legacy_wldev *dev) | |
806 | { | |
807 | u32 tmp; | |
808 | u16 mmio_base; | |
809 | ||
810 | tmp = b43legacy_read32(dev, SSB_TMSHIGH); | |
811 | if (tmp & SSB_TMSHIGH_DMA64) | |
812 | return DMA_64BIT_MASK; | |
813 | mmio_base = b43legacy_dmacontroller_base(0, 0); | |
814 | b43legacy_write32(dev, | |
815 | mmio_base + B43legacy_DMA32_TXCTL, | |
816 | B43legacy_DMA32_TXADDREXT_MASK); | |
817 | tmp = b43legacy_read32(dev, mmio_base + | |
818 | B43legacy_DMA32_TXCTL); | |
819 | if (tmp & B43legacy_DMA32_TXADDREXT_MASK) | |
820 | return DMA_32BIT_MASK; | |
821 | ||
822 | return DMA_30BIT_MASK; | |
823 | } | |
824 | ||
825 | /* Main initialization function. */ | |
826 | static | |
827 | struct b43legacy_dmaring *b43legacy_setup_dmaring( | |
828 | struct b43legacy_wldev *dev, | |
829 | int controller_index, | |
830 | int for_tx, | |
831 | int dma64) | |
832 | { | |
833 | struct b43legacy_dmaring *ring; | |
834 | int err; | |
835 | int nr_slots; | |
836 | dma_addr_t dma_test; | |
837 | ||
838 | ring = kzalloc(sizeof(*ring), GFP_KERNEL); | |
839 | if (!ring) | |
840 | goto out; | |
841 | ||
842 | nr_slots = B43legacy_RXRING_SLOTS; | |
843 | if (for_tx) | |
844 | nr_slots = B43legacy_TXRING_SLOTS; | |
845 | ||
846 | ring->meta = kcalloc(nr_slots, sizeof(struct b43legacy_dmadesc_meta), | |
847 | GFP_KERNEL); | |
848 | if (!ring->meta) | |
849 | goto err_kfree_ring; | |
850 | if (for_tx) { | |
851 | ring->txhdr_cache = kcalloc(nr_slots, | |
852 | sizeof(struct b43legacy_txhdr_fw3), | |
853 | GFP_KERNEL); | |
854 | if (!ring->txhdr_cache) | |
855 | goto err_kfree_meta; | |
856 | ||
857 | /* test for ability to dma to txhdr_cache */ | |
858 | dma_test = dma_map_single(dev->dev->dev, | |
859 | ring->txhdr_cache, | |
860 | sizeof(struct b43legacy_txhdr_fw3), | |
861 | DMA_TO_DEVICE); | |
862 | ||
863 | if (dma_mapping_error(dma_test)) { | |
864 | /* ugh realloc */ | |
865 | kfree(ring->txhdr_cache); | |
866 | ring->txhdr_cache = kcalloc(nr_slots, | |
867 | sizeof(struct b43legacy_txhdr_fw3), | |
868 | GFP_KERNEL | GFP_DMA); | |
869 | if (!ring->txhdr_cache) | |
870 | goto err_kfree_meta; | |
871 | ||
872 | dma_test = dma_map_single(dev->dev->dev, | |
873 | ring->txhdr_cache, | |
874 | sizeof(struct b43legacy_txhdr_fw3), | |
875 | DMA_TO_DEVICE); | |
876 | ||
877 | if (dma_mapping_error(dma_test)) | |
878 | goto err_kfree_txhdr_cache; | |
879 | } | |
880 | ||
881 | dma_unmap_single(dev->dev->dev, | |
882 | dma_test, sizeof(struct b43legacy_txhdr_fw3), | |
883 | DMA_TO_DEVICE); | |
884 | } | |
885 | ||
886 | ring->dev = dev; | |
887 | ring->nr_slots = nr_slots; | |
888 | ring->mmio_base = b43legacy_dmacontroller_base(dma64, | |
889 | controller_index); | |
890 | ring->index = controller_index; | |
891 | ring->dma64 = !!dma64; | |
892 | if (dma64) | |
893 | ring->ops = &dma64_ops; | |
894 | else | |
895 | ring->ops = &dma32_ops; | |
896 | if (for_tx) { | |
897 | ring->tx = 1; | |
898 | ring->current_slot = -1; | |
899 | } else { | |
900 | if (ring->index == 0) { | |
901 | ring->rx_buffersize = B43legacy_DMA0_RX_BUFFERSIZE; | |
902 | ring->frameoffset = B43legacy_DMA0_RX_FRAMEOFFSET; | |
903 | } else if (ring->index == 3) { | |
904 | ring->rx_buffersize = B43legacy_DMA3_RX_BUFFERSIZE; | |
905 | ring->frameoffset = B43legacy_DMA3_RX_FRAMEOFFSET; | |
906 | } else | |
907 | B43legacy_WARN_ON(1); | |
908 | } | |
909 | spin_lock_init(&ring->lock); | |
910 | #ifdef CONFIG_B43LEGACY_DEBUG | |
911 | ring->last_injected_overflow = jiffies; | |
912 | #endif | |
913 | ||
914 | err = alloc_ringmemory(ring); | |
915 | if (err) | |
916 | goto err_kfree_txhdr_cache; | |
917 | err = dmacontroller_setup(ring); | |
918 | if (err) | |
919 | goto err_free_ringmemory; | |
920 | ||
921 | out: | |
922 | return ring; | |
923 | ||
924 | err_free_ringmemory: | |
925 | free_ringmemory(ring); | |
926 | err_kfree_txhdr_cache: | |
927 | kfree(ring->txhdr_cache); | |
928 | err_kfree_meta: | |
929 | kfree(ring->meta); | |
930 | err_kfree_ring: | |
931 | kfree(ring); | |
932 | ring = NULL; | |
933 | goto out; | |
934 | } | |
935 | ||
936 | /* Main cleanup function. */ | |
937 | static void b43legacy_destroy_dmaring(struct b43legacy_dmaring *ring) | |
938 | { | |
939 | if (!ring) | |
940 | return; | |
941 | ||
942 | b43legacydbg(ring->dev->wl, "DMA-%s 0x%04X (%s) max used slots:" | |
943 | " %d/%d\n", (ring->dma64) ? "64" : "32", ring->mmio_base, | |
944 | (ring->tx) ? "TX" : "RX", | |
945 | ring->max_used_slots, ring->nr_slots); | |
946 | /* Device IRQs are disabled prior entering this function, | |
947 | * so no need to take care of concurrency with rx handler stuff. | |
948 | */ | |
949 | dmacontroller_cleanup(ring); | |
950 | free_all_descbuffers(ring); | |
951 | free_ringmemory(ring); | |
952 | ||
953 | kfree(ring->txhdr_cache); | |
954 | kfree(ring->meta); | |
955 | kfree(ring); | |
956 | } | |
957 | ||
958 | void b43legacy_dma_free(struct b43legacy_wldev *dev) | |
959 | { | |
960 | struct b43legacy_dma *dma; | |
961 | ||
962 | if (b43legacy_using_pio(dev)) | |
963 | return; | |
964 | dma = &dev->dma; | |
965 | ||
966 | b43legacy_destroy_dmaring(dma->rx_ring3); | |
967 | dma->rx_ring3 = NULL; | |
968 | b43legacy_destroy_dmaring(dma->rx_ring0); | |
969 | dma->rx_ring0 = NULL; | |
970 | ||
971 | b43legacy_destroy_dmaring(dma->tx_ring5); | |
972 | dma->tx_ring5 = NULL; | |
973 | b43legacy_destroy_dmaring(dma->tx_ring4); | |
974 | dma->tx_ring4 = NULL; | |
975 | b43legacy_destroy_dmaring(dma->tx_ring3); | |
976 | dma->tx_ring3 = NULL; | |
977 | b43legacy_destroy_dmaring(dma->tx_ring2); | |
978 | dma->tx_ring2 = NULL; | |
979 | b43legacy_destroy_dmaring(dma->tx_ring1); | |
980 | dma->tx_ring1 = NULL; | |
981 | b43legacy_destroy_dmaring(dma->tx_ring0); | |
982 | dma->tx_ring0 = NULL; | |
983 | } | |
984 | ||
985 | int b43legacy_dma_init(struct b43legacy_wldev *dev) | |
986 | { | |
987 | struct b43legacy_dma *dma = &dev->dma; | |
988 | struct b43legacy_dmaring *ring; | |
989 | int err; | |
990 | u64 dmamask; | |
991 | int dma64 = 0; | |
992 | ||
993 | dmamask = supported_dma_mask(dev); | |
994 | if (dmamask == DMA_64BIT_MASK) | |
995 | dma64 = 1; | |
996 | ||
997 | err = ssb_dma_set_mask(dev->dev, dmamask); | |
998 | if (err) { | |
354807e0 | 999 | #ifdef CONFIG_B43LEGACY_PIO |
75388acd LF |
1000 | b43legacywarn(dev->wl, "DMA for this device not supported. " |
1001 | "Falling back to PIO\n"); | |
1002 | dev->__using_pio = 1; | |
1003 | return -EAGAIN; | |
1004 | #else | |
1005 | b43legacyerr(dev->wl, "DMA for this device not supported and " | |
1006 | "no PIO support compiled in\n"); | |
1007 | return -EOPNOTSUPP; | |
1008 | #endif | |
1009 | } | |
1010 | ||
1011 | err = -ENOMEM; | |
1012 | /* setup TX DMA channels. */ | |
1013 | ring = b43legacy_setup_dmaring(dev, 0, 1, dma64); | |
1014 | if (!ring) | |
1015 | goto out; | |
1016 | dma->tx_ring0 = ring; | |
1017 | ||
1018 | ring = b43legacy_setup_dmaring(dev, 1, 1, dma64); | |
1019 | if (!ring) | |
1020 | goto err_destroy_tx0; | |
1021 | dma->tx_ring1 = ring; | |
1022 | ||
1023 | ring = b43legacy_setup_dmaring(dev, 2, 1, dma64); | |
1024 | if (!ring) | |
1025 | goto err_destroy_tx1; | |
1026 | dma->tx_ring2 = ring; | |
1027 | ||
1028 | ring = b43legacy_setup_dmaring(dev, 3, 1, dma64); | |
1029 | if (!ring) | |
1030 | goto err_destroy_tx2; | |
1031 | dma->tx_ring3 = ring; | |
1032 | ||
1033 | ring = b43legacy_setup_dmaring(dev, 4, 1, dma64); | |
1034 | if (!ring) | |
1035 | goto err_destroy_tx3; | |
1036 | dma->tx_ring4 = ring; | |
1037 | ||
1038 | ring = b43legacy_setup_dmaring(dev, 5, 1, dma64); | |
1039 | if (!ring) | |
1040 | goto err_destroy_tx4; | |
1041 | dma->tx_ring5 = ring; | |
1042 | ||
1043 | /* setup RX DMA channels. */ | |
1044 | ring = b43legacy_setup_dmaring(dev, 0, 0, dma64); | |
1045 | if (!ring) | |
1046 | goto err_destroy_tx5; | |
1047 | dma->rx_ring0 = ring; | |
1048 | ||
1049 | if (dev->dev->id.revision < 5) { | |
1050 | ring = b43legacy_setup_dmaring(dev, 3, 0, dma64); | |
1051 | if (!ring) | |
1052 | goto err_destroy_rx0; | |
1053 | dma->rx_ring3 = ring; | |
1054 | } | |
1055 | ||
1056 | b43legacydbg(dev->wl, "%d-bit DMA initialized\n", | |
1057 | (dmamask == DMA_64BIT_MASK) ? 64 : | |
1058 | (dmamask == DMA_32BIT_MASK) ? 32 : 30); | |
1059 | err = 0; | |
1060 | out: | |
1061 | return err; | |
1062 | ||
1063 | err_destroy_rx0: | |
1064 | b43legacy_destroy_dmaring(dma->rx_ring0); | |
1065 | dma->rx_ring0 = NULL; | |
1066 | err_destroy_tx5: | |
1067 | b43legacy_destroy_dmaring(dma->tx_ring5); | |
1068 | dma->tx_ring5 = NULL; | |
1069 | err_destroy_tx4: | |
1070 | b43legacy_destroy_dmaring(dma->tx_ring4); | |
1071 | dma->tx_ring4 = NULL; | |
1072 | err_destroy_tx3: | |
1073 | b43legacy_destroy_dmaring(dma->tx_ring3); | |
1074 | dma->tx_ring3 = NULL; | |
1075 | err_destroy_tx2: | |
1076 | b43legacy_destroy_dmaring(dma->tx_ring2); | |
1077 | dma->tx_ring2 = NULL; | |
1078 | err_destroy_tx1: | |
1079 | b43legacy_destroy_dmaring(dma->tx_ring1); | |
1080 | dma->tx_ring1 = NULL; | |
1081 | err_destroy_tx0: | |
1082 | b43legacy_destroy_dmaring(dma->tx_ring0); | |
1083 | dma->tx_ring0 = NULL; | |
1084 | goto out; | |
1085 | } | |
1086 | ||
1087 | /* Generate a cookie for the TX header. */ | |
1088 | static u16 generate_cookie(struct b43legacy_dmaring *ring, | |
1089 | int slot) | |
1090 | { | |
1091 | u16 cookie = 0x1000; | |
1092 | ||
1093 | /* Use the upper 4 bits of the cookie as | |
1094 | * DMA controller ID and store the slot number | |
1095 | * in the lower 12 bits. | |
1096 | * Note that the cookie must never be 0, as this | |
1097 | * is a special value used in RX path. | |
1098 | */ | |
1099 | switch (ring->index) { | |
1100 | case 0: | |
1101 | cookie = 0xA000; | |
1102 | break; | |
1103 | case 1: | |
1104 | cookie = 0xB000; | |
1105 | break; | |
1106 | case 2: | |
1107 | cookie = 0xC000; | |
1108 | break; | |
1109 | case 3: | |
1110 | cookie = 0xD000; | |
1111 | break; | |
1112 | case 4: | |
1113 | cookie = 0xE000; | |
1114 | break; | |
1115 | case 5: | |
1116 | cookie = 0xF000; | |
1117 | break; | |
1118 | } | |
1119 | B43legacy_WARN_ON(!(((u16)slot & 0xF000) == 0x0000)); | |
1120 | cookie |= (u16)slot; | |
1121 | ||
1122 | return cookie; | |
1123 | } | |
1124 | ||
1125 | /* Inspect a cookie and find out to which controller/slot it belongs. */ | |
1126 | static | |
1127 | struct b43legacy_dmaring *parse_cookie(struct b43legacy_wldev *dev, | |
1128 | u16 cookie, int *slot) | |
1129 | { | |
1130 | struct b43legacy_dma *dma = &dev->dma; | |
1131 | struct b43legacy_dmaring *ring = NULL; | |
1132 | ||
1133 | switch (cookie & 0xF000) { | |
1134 | case 0xA000: | |
1135 | ring = dma->tx_ring0; | |
1136 | break; | |
1137 | case 0xB000: | |
1138 | ring = dma->tx_ring1; | |
1139 | break; | |
1140 | case 0xC000: | |
1141 | ring = dma->tx_ring2; | |
1142 | break; | |
1143 | case 0xD000: | |
1144 | ring = dma->tx_ring3; | |
1145 | break; | |
1146 | case 0xE000: | |
1147 | ring = dma->tx_ring4; | |
1148 | break; | |
1149 | case 0xF000: | |
1150 | ring = dma->tx_ring5; | |
1151 | break; | |
1152 | default: | |
1153 | B43legacy_WARN_ON(1); | |
1154 | } | |
1155 | *slot = (cookie & 0x0FFF); | |
1156 | B43legacy_WARN_ON(!(ring && *slot >= 0 && *slot < ring->nr_slots)); | |
1157 | ||
1158 | return ring; | |
1159 | } | |
1160 | ||
1161 | static int dma_tx_fragment(struct b43legacy_dmaring *ring, | |
1162 | struct sk_buff *skb, | |
1163 | struct ieee80211_tx_control *ctl) | |
1164 | { | |
1165 | const struct b43legacy_dma_ops *ops = ring->ops; | |
1166 | u8 *header; | |
8dd0100c | 1167 | int slot, old_top_slot, old_used_slots; |
75388acd LF |
1168 | int err; |
1169 | struct b43legacy_dmadesc_generic *desc; | |
1170 | struct b43legacy_dmadesc_meta *meta; | |
1171 | struct b43legacy_dmadesc_meta *meta_hdr; | |
1172 | struct sk_buff *bounce_skb; | |
1173 | ||
1174 | #define SLOTS_PER_PACKET 2 | |
1175 | B43legacy_WARN_ON(skb_shinfo(skb)->nr_frags != 0); | |
1176 | ||
8dd0100c SB |
1177 | old_top_slot = ring->current_slot; |
1178 | old_used_slots = ring->used_slots; | |
1179 | ||
75388acd LF |
1180 | /* Get a slot for the header. */ |
1181 | slot = request_slot(ring); | |
1182 | desc = ops->idx2desc(ring, slot, &meta_hdr); | |
1183 | memset(meta_hdr, 0, sizeof(*meta_hdr)); | |
1184 | ||
1185 | header = &(ring->txhdr_cache[slot * sizeof( | |
1186 | struct b43legacy_txhdr_fw3)]); | |
9eca9a8e | 1187 | err = b43legacy_generate_txhdr(ring->dev, header, |
75388acd LF |
1188 | skb->data, skb->len, ctl, |
1189 | generate_cookie(ring, slot)); | |
8dd0100c SB |
1190 | if (unlikely(err)) { |
1191 | ring->current_slot = old_top_slot; | |
1192 | ring->used_slots = old_used_slots; | |
9eca9a8e | 1193 | return err; |
8dd0100c | 1194 | } |
75388acd LF |
1195 | |
1196 | meta_hdr->dmaaddr = map_descbuffer(ring, (unsigned char *)header, | |
1197 | sizeof(struct b43legacy_txhdr_fw3), 1); | |
1198 | if (dma_mapping_error(meta_hdr->dmaaddr)) | |
1199 | return -EIO; | |
1200 | ops->fill_descriptor(ring, desc, meta_hdr->dmaaddr, | |
1201 | sizeof(struct b43legacy_txhdr_fw3), 1, 0, 0); | |
1202 | ||
1203 | /* Get a slot for the payload. */ | |
1204 | slot = request_slot(ring); | |
1205 | desc = ops->idx2desc(ring, slot, &meta); | |
1206 | memset(meta, 0, sizeof(*meta)); | |
1207 | ||
1208 | memcpy(&meta->txstat.control, ctl, sizeof(*ctl)); | |
1209 | meta->skb = skb; | |
1210 | meta->is_last_fragment = 1; | |
1211 | ||
1212 | meta->dmaaddr = map_descbuffer(ring, skb->data, skb->len, 1); | |
1213 | /* create a bounce buffer in zone_dma on mapping failure. */ | |
1214 | if (dma_mapping_error(meta->dmaaddr)) { | |
1215 | bounce_skb = __dev_alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA); | |
1216 | if (!bounce_skb) { | |
8dd0100c SB |
1217 | ring->current_slot = old_top_slot; |
1218 | ring->used_slots = old_used_slots; | |
75388acd LF |
1219 | err = -ENOMEM; |
1220 | goto out_unmap_hdr; | |
1221 | } | |
1222 | ||
1223 | memcpy(skb_put(bounce_skb, skb->len), skb->data, skb->len); | |
1224 | dev_kfree_skb_any(skb); | |
1225 | skb = bounce_skb; | |
1226 | meta->skb = skb; | |
1227 | meta->dmaaddr = map_descbuffer(ring, skb->data, skb->len, 1); | |
1228 | if (dma_mapping_error(meta->dmaaddr)) { | |
8dd0100c SB |
1229 | ring->current_slot = old_top_slot; |
1230 | ring->used_slots = old_used_slots; | |
75388acd LF |
1231 | err = -EIO; |
1232 | goto out_free_bounce; | |
1233 | } | |
1234 | } | |
1235 | ||
1236 | ops->fill_descriptor(ring, desc, meta->dmaaddr, | |
1237 | skb->len, 0, 1, 1); | |
1238 | ||
1239 | wmb(); /* previous stuff MUST be done */ | |
1240 | /* Now transfer the whole frame. */ | |
1241 | ops->poke_tx(ring, next_slot(ring, slot)); | |
1242 | return 0; | |
1243 | ||
1244 | out_free_bounce: | |
1245 | dev_kfree_skb_any(skb); | |
1246 | out_unmap_hdr: | |
1247 | unmap_descbuffer(ring, meta_hdr->dmaaddr, | |
1248 | sizeof(struct b43legacy_txhdr_fw3), 1); | |
1249 | return err; | |
1250 | } | |
1251 | ||
1252 | static inline | |
1253 | int should_inject_overflow(struct b43legacy_dmaring *ring) | |
1254 | { | |
1255 | #ifdef CONFIG_B43LEGACY_DEBUG | |
1256 | if (unlikely(b43legacy_debug(ring->dev, | |
1257 | B43legacy_DBG_DMAOVERFLOW))) { | |
1258 | /* Check if we should inject another ringbuffer overflow | |
1259 | * to test handling of this situation in the stack. */ | |
1260 | unsigned long next_overflow; | |
1261 | ||
1262 | next_overflow = ring->last_injected_overflow + HZ; | |
1263 | if (time_after(jiffies, next_overflow)) { | |
1264 | ring->last_injected_overflow = jiffies; | |
1265 | b43legacydbg(ring->dev->wl, | |
1266 | "Injecting TX ring overflow on " | |
1267 | "DMA controller %d\n", ring->index); | |
1268 | return 1; | |
1269 | } | |
1270 | } | |
1271 | #endif /* CONFIG_B43LEGACY_DEBUG */ | |
1272 | return 0; | |
1273 | } | |
1274 | ||
1275 | int b43legacy_dma_tx(struct b43legacy_wldev *dev, | |
1276 | struct sk_buff *skb, | |
1277 | struct ieee80211_tx_control *ctl) | |
1278 | { | |
1279 | struct b43legacy_dmaring *ring; | |
1280 | int err = 0; | |
1281 | unsigned long flags; | |
1282 | ||
1283 | ring = priority_to_txring(dev, ctl->queue); | |
1284 | spin_lock_irqsave(&ring->lock, flags); | |
1285 | B43legacy_WARN_ON(!ring->tx); | |
1286 | if (unlikely(free_slots(ring) < SLOTS_PER_PACKET)) { | |
1287 | b43legacywarn(dev->wl, "DMA queue overflow\n"); | |
1288 | err = -ENOSPC; | |
1289 | goto out_unlock; | |
1290 | } | |
1291 | /* Check if the queue was stopped in mac80211, | |
1292 | * but we got called nevertheless. | |
1293 | * That would be a mac80211 bug. */ | |
1294 | B43legacy_BUG_ON(ring->stopped); | |
1295 | ||
1296 | err = dma_tx_fragment(ring, skb, ctl); | |
9eca9a8e SB |
1297 | if (unlikely(err == -ENOKEY)) { |
1298 | /* Drop this packet, as we don't have the encryption key | |
1299 | * anymore and must not transmit it unencrypted. */ | |
1300 | dev_kfree_skb_any(skb); | |
1301 | err = 0; | |
1302 | goto out_unlock; | |
1303 | } | |
75388acd LF |
1304 | if (unlikely(err)) { |
1305 | b43legacyerr(dev->wl, "DMA tx mapping failure\n"); | |
1306 | goto out_unlock; | |
1307 | } | |
1308 | ring->nr_tx_packets++; | |
1309 | if ((free_slots(ring) < SLOTS_PER_PACKET) || | |
1310 | should_inject_overflow(ring)) { | |
1311 | /* This TX ring is full. */ | |
1312 | ieee80211_stop_queue(dev->wl->hw, txring_to_priority(ring)); | |
1313 | ring->stopped = 1; | |
1314 | if (b43legacy_debug(dev, B43legacy_DBG_DMAVERBOSE)) | |
1315 | b43legacydbg(dev->wl, "Stopped TX ring %d\n", | |
1316 | ring->index); | |
1317 | } | |
1318 | out_unlock: | |
1319 | spin_unlock_irqrestore(&ring->lock, flags); | |
1320 | ||
1321 | return err; | |
1322 | } | |
1323 | ||
1324 | void b43legacy_dma_handle_txstatus(struct b43legacy_wldev *dev, | |
1325 | const struct b43legacy_txstatus *status) | |
1326 | { | |
1327 | const struct b43legacy_dma_ops *ops; | |
1328 | struct b43legacy_dmaring *ring; | |
1329 | struct b43legacy_dmadesc_generic *desc; | |
1330 | struct b43legacy_dmadesc_meta *meta; | |
1331 | int slot; | |
1332 | ||
1333 | ring = parse_cookie(dev, status->cookie, &slot); | |
1334 | if (unlikely(!ring)) | |
1335 | return; | |
1336 | B43legacy_WARN_ON(!irqs_disabled()); | |
1337 | spin_lock(&ring->lock); | |
1338 | ||
1339 | B43legacy_WARN_ON(!ring->tx); | |
1340 | ops = ring->ops; | |
1341 | while (1) { | |
1342 | B43legacy_WARN_ON(!(slot >= 0 && slot < ring->nr_slots)); | |
1343 | desc = ops->idx2desc(ring, slot, &meta); | |
1344 | ||
1345 | if (meta->skb) | |
1346 | unmap_descbuffer(ring, meta->dmaaddr, | |
1347 | meta->skb->len, 1); | |
1348 | else | |
1349 | unmap_descbuffer(ring, meta->dmaaddr, | |
1350 | sizeof(struct b43legacy_txhdr_fw3), | |
1351 | 1); | |
1352 | ||
1353 | if (meta->is_last_fragment) { | |
1354 | B43legacy_WARN_ON(!meta->skb); | |
1355 | /* Call back to inform the ieee80211 subsystem about the | |
1356 | * status of the transmission. | |
1357 | * Some fields of txstat are already filled in dma_tx(). | |
1358 | */ | |
1359 | if (status->acked) { | |
1360 | meta->txstat.flags |= IEEE80211_TX_STATUS_ACK; | |
1361 | } else { | |
1362 | if (!(meta->txstat.control.flags | |
1363 | & IEEE80211_TXCTL_NO_ACK)) | |
1364 | meta->txstat.excessive_retries = 1; | |
1365 | } | |
1366 | if (status->frame_count == 0) { | |
1367 | /* The frame was not transmitted at all. */ | |
1368 | meta->txstat.retry_count = 0; | |
1369 | } else | |
1370 | meta->txstat.retry_count = status->frame_count | |
1371 | - 1; | |
1372 | ieee80211_tx_status_irqsafe(dev->wl->hw, meta->skb, | |
1373 | &(meta->txstat)); | |
1374 | /* skb is freed by ieee80211_tx_status_irqsafe() */ | |
1375 | meta->skb = NULL; | |
1376 | } else { | |
1377 | /* No need to call free_descriptor_buffer here, as | |
1378 | * this is only the txhdr, which is not allocated. | |
1379 | */ | |
1380 | B43legacy_WARN_ON(meta->skb != NULL); | |
1381 | } | |
1382 | ||
1383 | /* Everything unmapped and free'd. So it's not used anymore. */ | |
1384 | ring->used_slots--; | |
1385 | ||
1386 | if (meta->is_last_fragment) | |
1387 | break; | |
1388 | slot = next_slot(ring, slot); | |
1389 | } | |
1390 | dev->stats.last_tx = jiffies; | |
1391 | if (ring->stopped) { | |
1392 | B43legacy_WARN_ON(free_slots(ring) < SLOTS_PER_PACKET); | |
1393 | ieee80211_wake_queue(dev->wl->hw, txring_to_priority(ring)); | |
1394 | ring->stopped = 0; | |
1395 | if (b43legacy_debug(dev, B43legacy_DBG_DMAVERBOSE)) | |
1396 | b43legacydbg(dev->wl, "Woke up TX ring %d\n", | |
1397 | ring->index); | |
1398 | } | |
1399 | ||
1400 | spin_unlock(&ring->lock); | |
1401 | } | |
1402 | ||
1403 | void b43legacy_dma_get_tx_stats(struct b43legacy_wldev *dev, | |
1404 | struct ieee80211_tx_queue_stats *stats) | |
1405 | { | |
1406 | const int nr_queues = dev->wl->hw->queues; | |
1407 | struct b43legacy_dmaring *ring; | |
1408 | struct ieee80211_tx_queue_stats_data *data; | |
1409 | unsigned long flags; | |
1410 | int i; | |
1411 | ||
1412 | for (i = 0; i < nr_queues; i++) { | |
1413 | data = &(stats->data[i]); | |
1414 | ring = priority_to_txring(dev, i); | |
1415 | ||
1416 | spin_lock_irqsave(&ring->lock, flags); | |
1417 | data->len = ring->used_slots / SLOTS_PER_PACKET; | |
1418 | data->limit = ring->nr_slots / SLOTS_PER_PACKET; | |
1419 | data->count = ring->nr_tx_packets; | |
1420 | spin_unlock_irqrestore(&ring->lock, flags); | |
1421 | } | |
1422 | } | |
1423 | ||
1424 | static void dma_rx(struct b43legacy_dmaring *ring, | |
1425 | int *slot) | |
1426 | { | |
1427 | const struct b43legacy_dma_ops *ops = ring->ops; | |
1428 | struct b43legacy_dmadesc_generic *desc; | |
1429 | struct b43legacy_dmadesc_meta *meta; | |
1430 | struct b43legacy_rxhdr_fw3 *rxhdr; | |
1431 | struct sk_buff *skb; | |
1432 | u16 len; | |
1433 | int err; | |
1434 | dma_addr_t dmaaddr; | |
1435 | ||
1436 | desc = ops->idx2desc(ring, *slot, &meta); | |
1437 | ||
1438 | sync_descbuffer_for_cpu(ring, meta->dmaaddr, ring->rx_buffersize); | |
1439 | skb = meta->skb; | |
1440 | ||
1441 | if (ring->index == 3) { | |
1442 | /* We received an xmit status. */ | |
1443 | struct b43legacy_hwtxstatus *hw = | |
1444 | (struct b43legacy_hwtxstatus *)skb->data; | |
1445 | int i = 0; | |
1446 | ||
1447 | while (hw->cookie == 0) { | |
1448 | if (i > 100) | |
1449 | break; | |
1450 | i++; | |
1451 | udelay(2); | |
1452 | barrier(); | |
1453 | } | |
1454 | b43legacy_handle_hwtxstatus(ring->dev, hw); | |
1455 | /* recycle the descriptor buffer. */ | |
1456 | sync_descbuffer_for_device(ring, meta->dmaaddr, | |
1457 | ring->rx_buffersize); | |
1458 | ||
1459 | return; | |
1460 | } | |
1461 | rxhdr = (struct b43legacy_rxhdr_fw3 *)skb->data; | |
1462 | len = le16_to_cpu(rxhdr->frame_len); | |
1463 | if (len == 0) { | |
1464 | int i = 0; | |
1465 | ||
1466 | do { | |
1467 | udelay(2); | |
1468 | barrier(); | |
1469 | len = le16_to_cpu(rxhdr->frame_len); | |
1470 | } while (len == 0 && i++ < 5); | |
1471 | if (unlikely(len == 0)) { | |
1472 | /* recycle the descriptor buffer. */ | |
1473 | sync_descbuffer_for_device(ring, meta->dmaaddr, | |
1474 | ring->rx_buffersize); | |
1475 | goto drop; | |
1476 | } | |
1477 | } | |
1478 | if (unlikely(len > ring->rx_buffersize)) { | |
1479 | /* The data did not fit into one descriptor buffer | |
1480 | * and is split over multiple buffers. | |
1481 | * This should never happen, as we try to allocate buffers | |
1482 | * big enough. So simply ignore this packet. | |
1483 | */ | |
1484 | int cnt = 0; | |
1485 | s32 tmp = len; | |
1486 | ||
1487 | while (1) { | |
1488 | desc = ops->idx2desc(ring, *slot, &meta); | |
1489 | /* recycle the descriptor buffer. */ | |
1490 | sync_descbuffer_for_device(ring, meta->dmaaddr, | |
1491 | ring->rx_buffersize); | |
1492 | *slot = next_slot(ring, *slot); | |
1493 | cnt++; | |
1494 | tmp -= ring->rx_buffersize; | |
1495 | if (tmp <= 0) | |
1496 | break; | |
1497 | } | |
1498 | b43legacyerr(ring->dev->wl, "DMA RX buffer too small " | |
1499 | "(len: %u, buffer: %u, nr-dropped: %d)\n", | |
1500 | len, ring->rx_buffersize, cnt); | |
1501 | goto drop; | |
1502 | } | |
1503 | ||
1504 | dmaaddr = meta->dmaaddr; | |
1505 | err = setup_rx_descbuffer(ring, desc, meta, GFP_ATOMIC); | |
1506 | if (unlikely(err)) { | |
1507 | b43legacydbg(ring->dev->wl, "DMA RX: setup_rx_descbuffer()" | |
1508 | " failed\n"); | |
1509 | sync_descbuffer_for_device(ring, dmaaddr, | |
1510 | ring->rx_buffersize); | |
1511 | goto drop; | |
1512 | } | |
1513 | ||
1514 | unmap_descbuffer(ring, dmaaddr, ring->rx_buffersize, 0); | |
1515 | skb_put(skb, len + ring->frameoffset); | |
1516 | skb_pull(skb, ring->frameoffset); | |
1517 | ||
1518 | b43legacy_rx(ring->dev, skb, rxhdr); | |
1519 | drop: | |
1520 | return; | |
1521 | } | |
1522 | ||
1523 | void b43legacy_dma_rx(struct b43legacy_dmaring *ring) | |
1524 | { | |
1525 | const struct b43legacy_dma_ops *ops = ring->ops; | |
1526 | int slot; | |
1527 | int current_slot; | |
1528 | int used_slots = 0; | |
1529 | ||
1530 | B43legacy_WARN_ON(ring->tx); | |
1531 | current_slot = ops->get_current_rxslot(ring); | |
1532 | B43legacy_WARN_ON(!(current_slot >= 0 && current_slot < | |
1533 | ring->nr_slots)); | |
1534 | ||
1535 | slot = ring->current_slot; | |
1536 | for (; slot != current_slot; slot = next_slot(ring, slot)) { | |
1537 | dma_rx(ring, &slot); | |
1538 | update_max_used_slots(ring, ++used_slots); | |
1539 | } | |
1540 | ops->set_current_rxslot(ring, slot); | |
1541 | ring->current_slot = slot; | |
1542 | } | |
1543 | ||
1544 | static void b43legacy_dma_tx_suspend_ring(struct b43legacy_dmaring *ring) | |
1545 | { | |
1546 | unsigned long flags; | |
1547 | ||
1548 | spin_lock_irqsave(&ring->lock, flags); | |
1549 | B43legacy_WARN_ON(!ring->tx); | |
1550 | ring->ops->tx_suspend(ring); | |
1551 | spin_unlock_irqrestore(&ring->lock, flags); | |
1552 | } | |
1553 | ||
1554 | static void b43legacy_dma_tx_resume_ring(struct b43legacy_dmaring *ring) | |
1555 | { | |
1556 | unsigned long flags; | |
1557 | ||
1558 | spin_lock_irqsave(&ring->lock, flags); | |
1559 | B43legacy_WARN_ON(!ring->tx); | |
1560 | ring->ops->tx_resume(ring); | |
1561 | spin_unlock_irqrestore(&ring->lock, flags); | |
1562 | } | |
1563 | ||
1564 | void b43legacy_dma_tx_suspend(struct b43legacy_wldev *dev) | |
1565 | { | |
1566 | b43legacy_power_saving_ctl_bits(dev, -1, 1); | |
1567 | b43legacy_dma_tx_suspend_ring(dev->dma.tx_ring0); | |
1568 | b43legacy_dma_tx_suspend_ring(dev->dma.tx_ring1); | |
1569 | b43legacy_dma_tx_suspend_ring(dev->dma.tx_ring2); | |
1570 | b43legacy_dma_tx_suspend_ring(dev->dma.tx_ring3); | |
1571 | b43legacy_dma_tx_suspend_ring(dev->dma.tx_ring4); | |
1572 | b43legacy_dma_tx_suspend_ring(dev->dma.tx_ring5); | |
1573 | } | |
1574 | ||
1575 | void b43legacy_dma_tx_resume(struct b43legacy_wldev *dev) | |
1576 | { | |
1577 | b43legacy_dma_tx_resume_ring(dev->dma.tx_ring5); | |
1578 | b43legacy_dma_tx_resume_ring(dev->dma.tx_ring4); | |
1579 | b43legacy_dma_tx_resume_ring(dev->dma.tx_ring3); | |
1580 | b43legacy_dma_tx_resume_ring(dev->dma.tx_ring2); | |
1581 | b43legacy_dma_tx_resume_ring(dev->dma.tx_ring1); | |
1582 | b43legacy_dma_tx_resume_ring(dev->dma.tx_ring0); | |
1583 | b43legacy_power_saving_ctl_bits(dev, -1, -1); | |
1584 | } |