Commit | Line | Data |
---|---|---|
75388acd LF |
1 | /* |
2 | ||
3 | Broadcom B43legacy wireless driver | |
4 | ||
5 | DMA ringbuffer and descriptor allocation/management | |
6 | ||
eb032b98 | 7 | Copyright (c) 2005, 2006 Michael Buesch <m@bues.ch> |
75388acd LF |
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> | |
5a0e3ad6 | 40 | #include <linux/slab.h> |
75388acd LF |
41 | #include <net/dst.h> |
42 | ||
43 | /* 32bit DMA ops. */ | |
44 | static | |
45 | struct b43legacy_dmadesc_generic *op32_idx2desc( | |
46 | struct b43legacy_dmaring *ring, | |
47 | int slot, | |
48 | struct b43legacy_dmadesc_meta **meta) | |
49 | { | |
50 | struct b43legacy_dmadesc32 *desc; | |
51 | ||
52 | *meta = &(ring->meta[slot]); | |
53 | desc = ring->descbase; | |
54 | desc = &(desc[slot]); | |
55 | ||
56 | return (struct b43legacy_dmadesc_generic *)desc; | |
57 | } | |
58 | ||
59 | static void op32_fill_descriptor(struct b43legacy_dmaring *ring, | |
60 | struct b43legacy_dmadesc_generic *desc, | |
61 | dma_addr_t dmaaddr, u16 bufsize, | |
62 | int start, int end, int irq) | |
63 | { | |
64 | struct b43legacy_dmadesc32 *descbase = ring->descbase; | |
65 | int slot; | |
66 | u32 ctl; | |
67 | u32 addr; | |
68 | u32 addrext; | |
69 | ||
70 | slot = (int)(&(desc->dma32) - descbase); | |
71 | B43legacy_WARN_ON(!(slot >= 0 && slot < ring->nr_slots)); | |
72 | ||
73 | addr = (u32)(dmaaddr & ~SSB_DMA_TRANSLATION_MASK); | |
74 | addrext = (u32)(dmaaddr & SSB_DMA_TRANSLATION_MASK) | |
75 | >> SSB_DMA_TRANSLATION_SHIFT; | |
76 | addr |= ssb_dma_translation(ring->dev->dev); | |
77 | ctl = (bufsize - ring->frameoffset) | |
78 | & B43legacy_DMA32_DCTL_BYTECNT; | |
79 | if (slot == ring->nr_slots - 1) | |
80 | ctl |= B43legacy_DMA32_DCTL_DTABLEEND; | |
81 | if (start) | |
82 | ctl |= B43legacy_DMA32_DCTL_FRAMESTART; | |
83 | if (end) | |
84 | ctl |= B43legacy_DMA32_DCTL_FRAMEEND; | |
85 | if (irq) | |
86 | ctl |= B43legacy_DMA32_DCTL_IRQ; | |
87 | ctl |= (addrext << B43legacy_DMA32_DCTL_ADDREXT_SHIFT) | |
88 | & B43legacy_DMA32_DCTL_ADDREXT_MASK; | |
89 | ||
90 | desc->dma32.control = cpu_to_le32(ctl); | |
91 | desc->dma32.address = cpu_to_le32(addr); | |
92 | } | |
93 | ||
94 | static void op32_poke_tx(struct b43legacy_dmaring *ring, int slot) | |
95 | { | |
96 | b43legacy_dma_write(ring, B43legacy_DMA32_TXINDEX, | |
97 | (u32)(slot * sizeof(struct b43legacy_dmadesc32))); | |
98 | } | |
99 | ||
100 | static void op32_tx_suspend(struct b43legacy_dmaring *ring) | |
101 | { | |
102 | b43legacy_dma_write(ring, B43legacy_DMA32_TXCTL, | |
103 | b43legacy_dma_read(ring, B43legacy_DMA32_TXCTL) | |
104 | | B43legacy_DMA32_TXSUSPEND); | |
105 | } | |
106 | ||
107 | static void op32_tx_resume(struct b43legacy_dmaring *ring) | |
108 | { | |
109 | b43legacy_dma_write(ring, B43legacy_DMA32_TXCTL, | |
110 | b43legacy_dma_read(ring, B43legacy_DMA32_TXCTL) | |
111 | & ~B43legacy_DMA32_TXSUSPEND); | |
112 | } | |
113 | ||
114 | static int op32_get_current_rxslot(struct b43legacy_dmaring *ring) | |
115 | { | |
116 | u32 val; | |
117 | ||
118 | val = b43legacy_dma_read(ring, B43legacy_DMA32_RXSTATUS); | |
119 | val &= B43legacy_DMA32_RXDPTR; | |
120 | ||
121 | return (val / sizeof(struct b43legacy_dmadesc32)); | |
122 | } | |
123 | ||
124 | static void op32_set_current_rxslot(struct b43legacy_dmaring *ring, | |
125 | int slot) | |
126 | { | |
127 | b43legacy_dma_write(ring, B43legacy_DMA32_RXINDEX, | |
128 | (u32)(slot * sizeof(struct b43legacy_dmadesc32))); | |
129 | } | |
130 | ||
131 | static const struct b43legacy_dma_ops dma32_ops = { | |
132 | .idx2desc = op32_idx2desc, | |
133 | .fill_descriptor = op32_fill_descriptor, | |
134 | .poke_tx = op32_poke_tx, | |
135 | .tx_suspend = op32_tx_suspend, | |
136 | .tx_resume = op32_tx_resume, | |
137 | .get_current_rxslot = op32_get_current_rxslot, | |
138 | .set_current_rxslot = op32_set_current_rxslot, | |
139 | }; | |
140 | ||
141 | /* 64bit DMA ops. */ | |
142 | static | |
143 | struct b43legacy_dmadesc_generic *op64_idx2desc( | |
144 | struct b43legacy_dmaring *ring, | |
145 | int slot, | |
146 | struct b43legacy_dmadesc_meta | |
147 | **meta) | |
148 | { | |
149 | struct b43legacy_dmadesc64 *desc; | |
150 | ||
151 | *meta = &(ring->meta[slot]); | |
152 | desc = ring->descbase; | |
153 | desc = &(desc[slot]); | |
154 | ||
155 | return (struct b43legacy_dmadesc_generic *)desc; | |
156 | } | |
157 | ||
158 | static void op64_fill_descriptor(struct b43legacy_dmaring *ring, | |
159 | struct b43legacy_dmadesc_generic *desc, | |
160 | dma_addr_t dmaaddr, u16 bufsize, | |
161 | int start, int end, int irq) | |
162 | { | |
163 | struct b43legacy_dmadesc64 *descbase = ring->descbase; | |
164 | int slot; | |
165 | u32 ctl0 = 0; | |
166 | u32 ctl1 = 0; | |
167 | u32 addrlo; | |
168 | u32 addrhi; | |
169 | u32 addrext; | |
170 | ||
171 | slot = (int)(&(desc->dma64) - descbase); | |
172 | B43legacy_WARN_ON(!(slot >= 0 && slot < ring->nr_slots)); | |
173 | ||
174 | addrlo = (u32)(dmaaddr & 0xFFFFFFFF); | |
175 | addrhi = (((u64)dmaaddr >> 32) & ~SSB_DMA_TRANSLATION_MASK); | |
176 | addrext = (((u64)dmaaddr >> 32) & SSB_DMA_TRANSLATION_MASK) | |
177 | >> SSB_DMA_TRANSLATION_SHIFT; | |
178 | addrhi |= ssb_dma_translation(ring->dev->dev); | |
179 | if (slot == ring->nr_slots - 1) | |
180 | ctl0 |= B43legacy_DMA64_DCTL0_DTABLEEND; | |
181 | if (start) | |
182 | ctl0 |= B43legacy_DMA64_DCTL0_FRAMESTART; | |
183 | if (end) | |
184 | ctl0 |= B43legacy_DMA64_DCTL0_FRAMEEND; | |
185 | if (irq) | |
186 | ctl0 |= B43legacy_DMA64_DCTL0_IRQ; | |
187 | ctl1 |= (bufsize - ring->frameoffset) | |
188 | & B43legacy_DMA64_DCTL1_BYTECNT; | |
189 | ctl1 |= (addrext << B43legacy_DMA64_DCTL1_ADDREXT_SHIFT) | |
190 | & B43legacy_DMA64_DCTL1_ADDREXT_MASK; | |
191 | ||
192 | desc->dma64.control0 = cpu_to_le32(ctl0); | |
193 | desc->dma64.control1 = cpu_to_le32(ctl1); | |
194 | desc->dma64.address_low = cpu_to_le32(addrlo); | |
195 | desc->dma64.address_high = cpu_to_le32(addrhi); | |
196 | } | |
197 | ||
198 | static void op64_poke_tx(struct b43legacy_dmaring *ring, int slot) | |
199 | { | |
200 | b43legacy_dma_write(ring, B43legacy_DMA64_TXINDEX, | |
201 | (u32)(slot * sizeof(struct b43legacy_dmadesc64))); | |
202 | } | |
203 | ||
204 | static void op64_tx_suspend(struct b43legacy_dmaring *ring) | |
205 | { | |
206 | b43legacy_dma_write(ring, B43legacy_DMA64_TXCTL, | |
207 | b43legacy_dma_read(ring, B43legacy_DMA64_TXCTL) | |
208 | | B43legacy_DMA64_TXSUSPEND); | |
209 | } | |
210 | ||
211 | static void op64_tx_resume(struct b43legacy_dmaring *ring) | |
212 | { | |
213 | b43legacy_dma_write(ring, B43legacy_DMA64_TXCTL, | |
214 | b43legacy_dma_read(ring, B43legacy_DMA64_TXCTL) | |
215 | & ~B43legacy_DMA64_TXSUSPEND); | |
216 | } | |
217 | ||
218 | static int op64_get_current_rxslot(struct b43legacy_dmaring *ring) | |
219 | { | |
220 | u32 val; | |
221 | ||
222 | val = b43legacy_dma_read(ring, B43legacy_DMA64_RXSTATUS); | |
223 | val &= B43legacy_DMA64_RXSTATDPTR; | |
224 | ||
225 | return (val / sizeof(struct b43legacy_dmadesc64)); | |
226 | } | |
227 | ||
228 | static void op64_set_current_rxslot(struct b43legacy_dmaring *ring, | |
229 | int slot) | |
230 | { | |
231 | b43legacy_dma_write(ring, B43legacy_DMA64_RXINDEX, | |
232 | (u32)(slot * sizeof(struct b43legacy_dmadesc64))); | |
233 | } | |
234 | ||
235 | static const struct b43legacy_dma_ops dma64_ops = { | |
236 | .idx2desc = op64_idx2desc, | |
237 | .fill_descriptor = op64_fill_descriptor, | |
238 | .poke_tx = op64_poke_tx, | |
239 | .tx_suspend = op64_tx_suspend, | |
240 | .tx_resume = op64_tx_resume, | |
241 | .get_current_rxslot = op64_get_current_rxslot, | |
242 | .set_current_rxslot = op64_set_current_rxslot, | |
243 | }; | |
244 | ||
245 | ||
246 | static inline int free_slots(struct b43legacy_dmaring *ring) | |
247 | { | |
248 | return (ring->nr_slots - ring->used_slots); | |
249 | } | |
250 | ||
251 | static inline int next_slot(struct b43legacy_dmaring *ring, int slot) | |
252 | { | |
253 | B43legacy_WARN_ON(!(slot >= -1 && slot <= ring->nr_slots - 1)); | |
254 | if (slot == ring->nr_slots - 1) | |
255 | return 0; | |
256 | return slot + 1; | |
257 | } | |
258 | ||
259 | static inline int prev_slot(struct b43legacy_dmaring *ring, int slot) | |
260 | { | |
261 | B43legacy_WARN_ON(!(slot >= 0 && slot <= ring->nr_slots - 1)); | |
262 | if (slot == 0) | |
263 | return ring->nr_slots - 1; | |
264 | return slot - 1; | |
265 | } | |
266 | ||
267 | #ifdef CONFIG_B43LEGACY_DEBUG | |
268 | static void update_max_used_slots(struct b43legacy_dmaring *ring, | |
269 | int current_used_slots) | |
270 | { | |
271 | if (current_used_slots <= ring->max_used_slots) | |
272 | return; | |
273 | ring->max_used_slots = current_used_slots; | |
274 | if (b43legacy_debug(ring->dev, B43legacy_DBG_DMAVERBOSE)) | |
275 | b43legacydbg(ring->dev->wl, | |
276 | "max_used_slots increased to %d on %s ring %d\n", | |
277 | ring->max_used_slots, | |
278 | ring->tx ? "TX" : "RX", | |
279 | ring->index); | |
280 | } | |
281 | #else | |
282 | static inline | |
283 | void update_max_used_slots(struct b43legacy_dmaring *ring, | |
284 | int current_used_slots) | |
285 | { } | |
286 | #endif /* DEBUG */ | |
287 | ||
288 | /* Request a slot for usage. */ | |
289 | static inline | |
290 | int request_slot(struct b43legacy_dmaring *ring) | |
291 | { | |
292 | int slot; | |
293 | ||
294 | B43legacy_WARN_ON(!ring->tx); | |
295 | B43legacy_WARN_ON(ring->stopped); | |
296 | B43legacy_WARN_ON(free_slots(ring) == 0); | |
297 | ||
298 | slot = next_slot(ring, ring->current_slot); | |
299 | ring->current_slot = slot; | |
300 | ring->used_slots++; | |
301 | ||
302 | update_max_used_slots(ring, ring->used_slots); | |
303 | ||
304 | return slot; | |
305 | } | |
306 | ||
307 | /* Mac80211-queue to b43legacy-ring mapping */ | |
308 | static struct b43legacy_dmaring *priority_to_txring( | |
309 | struct b43legacy_wldev *dev, | |
310 | int queue_priority) | |
311 | { | |
312 | struct b43legacy_dmaring *ring; | |
313 | ||
314 | /*FIXME: For now we always run on TX-ring-1 */ | |
315 | return dev->dma.tx_ring1; | |
316 | ||
317 | /* 0 = highest priority */ | |
318 | switch (queue_priority) { | |
319 | default: | |
320 | B43legacy_WARN_ON(1); | |
321 | /* fallthrough */ | |
322 | case 0: | |
323 | ring = dev->dma.tx_ring3; | |
324 | break; | |
325 | case 1: | |
326 | ring = dev->dma.tx_ring2; | |
327 | break; | |
328 | case 2: | |
329 | ring = dev->dma.tx_ring1; | |
330 | break; | |
331 | case 3: | |
332 | ring = dev->dma.tx_ring0; | |
333 | break; | |
334 | case 4: | |
335 | ring = dev->dma.tx_ring4; | |
336 | break; | |
337 | case 5: | |
338 | ring = dev->dma.tx_ring5; | |
339 | break; | |
340 | } | |
341 | ||
342 | return ring; | |
343 | } | |
344 | ||
345 | /* Bcm4301-ring to mac80211-queue mapping */ | |
346 | static inline int txring_to_priority(struct b43legacy_dmaring *ring) | |
347 | { | |
348 | static const u8 idx_to_prio[] = | |
349 | { 3, 2, 1, 0, 4, 5, }; | |
350 | ||
351 | /*FIXME: have only one queue, for now */ | |
352 | return 0; | |
353 | ||
354 | return idx_to_prio[ring->index]; | |
355 | } | |
356 | ||
357 | ||
8e118f0e SB |
358 | static u16 b43legacy_dmacontroller_base(enum b43legacy_dmatype type, |
359 | int controller_idx) | |
75388acd LF |
360 | { |
361 | static const u16 map64[] = { | |
362 | B43legacy_MMIO_DMA64_BASE0, | |
363 | B43legacy_MMIO_DMA64_BASE1, | |
364 | B43legacy_MMIO_DMA64_BASE2, | |
365 | B43legacy_MMIO_DMA64_BASE3, | |
366 | B43legacy_MMIO_DMA64_BASE4, | |
367 | B43legacy_MMIO_DMA64_BASE5, | |
368 | }; | |
369 | static const u16 map32[] = { | |
370 | B43legacy_MMIO_DMA32_BASE0, | |
371 | B43legacy_MMIO_DMA32_BASE1, | |
372 | B43legacy_MMIO_DMA32_BASE2, | |
373 | B43legacy_MMIO_DMA32_BASE3, | |
374 | B43legacy_MMIO_DMA32_BASE4, | |
375 | B43legacy_MMIO_DMA32_BASE5, | |
376 | }; | |
377 | ||
8e118f0e | 378 | if (type == B43legacy_DMA_64BIT) { |
75388acd LF |
379 | B43legacy_WARN_ON(!(controller_idx >= 0 && |
380 | controller_idx < ARRAY_SIZE(map64))); | |
381 | return map64[controller_idx]; | |
382 | } | |
383 | B43legacy_WARN_ON(!(controller_idx >= 0 && | |
384 | controller_idx < ARRAY_SIZE(map32))); | |
385 | return map32[controller_idx]; | |
386 | } | |
387 | ||
388 | static inline | |
389 | dma_addr_t map_descbuffer(struct b43legacy_dmaring *ring, | |
390 | unsigned char *buf, | |
391 | size_t len, | |
392 | int tx) | |
393 | { | |
394 | dma_addr_t dmaaddr; | |
395 | ||
396 | if (tx) | |
4e803132 | 397 | dmaaddr = dma_map_single(ring->dev->dev->dma_dev, |
f225763a MB |
398 | buf, len, |
399 | DMA_TO_DEVICE); | |
75388acd | 400 | else |
4e803132 | 401 | dmaaddr = dma_map_single(ring->dev->dev->dma_dev, |
f225763a MB |
402 | buf, len, |
403 | DMA_FROM_DEVICE); | |
75388acd LF |
404 | |
405 | return dmaaddr; | |
406 | } | |
407 | ||
408 | static inline | |
409 | void unmap_descbuffer(struct b43legacy_dmaring *ring, | |
410 | dma_addr_t addr, | |
411 | size_t len, | |
412 | int tx) | |
413 | { | |
414 | if (tx) | |
4e803132 | 415 | dma_unmap_single(ring->dev->dev->dma_dev, |
f225763a MB |
416 | addr, len, |
417 | DMA_TO_DEVICE); | |
75388acd | 418 | else |
4e803132 | 419 | dma_unmap_single(ring->dev->dev->dma_dev, |
f225763a MB |
420 | addr, len, |
421 | DMA_FROM_DEVICE); | |
75388acd LF |
422 | } |
423 | ||
424 | static inline | |
425 | void sync_descbuffer_for_cpu(struct b43legacy_dmaring *ring, | |
426 | dma_addr_t addr, | |
427 | size_t len) | |
428 | { | |
429 | B43legacy_WARN_ON(ring->tx); | |
430 | ||
4e803132 FT |
431 | dma_sync_single_for_cpu(ring->dev->dev->dma_dev, |
432 | addr, len, DMA_FROM_DEVICE); | |
75388acd LF |
433 | } |
434 | ||
435 | static inline | |
436 | void sync_descbuffer_for_device(struct b43legacy_dmaring *ring, | |
437 | dma_addr_t addr, | |
438 | size_t len) | |
439 | { | |
440 | B43legacy_WARN_ON(ring->tx); | |
441 | ||
4e803132 FT |
442 | dma_sync_single_for_device(ring->dev->dev->dma_dev, |
443 | addr, len, DMA_FROM_DEVICE); | |
75388acd LF |
444 | } |
445 | ||
446 | static inline | |
447 | void free_descriptor_buffer(struct b43legacy_dmaring *ring, | |
448 | struct b43legacy_dmadesc_meta *meta, | |
449 | int irq_context) | |
450 | { | |
451 | if (meta->skb) { | |
452 | if (irq_context) | |
453 | dev_kfree_skb_irq(meta->skb); | |
454 | else | |
455 | dev_kfree_skb(meta->skb); | |
456 | meta->skb = NULL; | |
457 | } | |
458 | } | |
459 | ||
460 | static int alloc_ringmemory(struct b43legacy_dmaring *ring) | |
461 | { | |
f225763a | 462 | /* GFP flags must match the flags in free_ringmemory()! */ |
4e803132 FT |
463 | ring->descbase = dma_alloc_coherent(ring->dev->dev->dma_dev, |
464 | B43legacy_DMA_RINGMEMSIZE, | |
465 | &(ring->dmabase), | |
466 | GFP_KERNEL); | |
75388acd LF |
467 | if (!ring->descbase) { |
468 | b43legacyerr(ring->dev->wl, "DMA ringmemory allocation" | |
469 | " failed\n"); | |
470 | return -ENOMEM; | |
471 | } | |
472 | memset(ring->descbase, 0, B43legacy_DMA_RINGMEMSIZE); | |
473 | ||
474 | return 0; | |
475 | } | |
476 | ||
477 | static void free_ringmemory(struct b43legacy_dmaring *ring) | |
478 | { | |
4e803132 FT |
479 | dma_free_coherent(ring->dev->dev->dma_dev, B43legacy_DMA_RINGMEMSIZE, |
480 | ring->descbase, ring->dmabase); | |
75388acd LF |
481 | } |
482 | ||
483 | /* Reset the RX DMA channel */ | |
8e118f0e SB |
484 | static int b43legacy_dmacontroller_rx_reset(struct b43legacy_wldev *dev, |
485 | u16 mmio_base, | |
486 | enum b43legacy_dmatype type) | |
75388acd LF |
487 | { |
488 | int i; | |
489 | u32 value; | |
490 | u16 offset; | |
491 | ||
492 | might_sleep(); | |
493 | ||
8e118f0e SB |
494 | offset = (type == B43legacy_DMA_64BIT) ? |
495 | B43legacy_DMA64_RXCTL : B43legacy_DMA32_RXCTL; | |
75388acd LF |
496 | b43legacy_write32(dev, mmio_base + offset, 0); |
497 | for (i = 0; i < 10; i++) { | |
8e118f0e SB |
498 | offset = (type == B43legacy_DMA_64BIT) ? |
499 | B43legacy_DMA64_RXSTATUS : B43legacy_DMA32_RXSTATUS; | |
75388acd | 500 | value = b43legacy_read32(dev, mmio_base + offset); |
8e118f0e | 501 | if (type == B43legacy_DMA_64BIT) { |
75388acd LF |
502 | value &= B43legacy_DMA64_RXSTAT; |
503 | if (value == B43legacy_DMA64_RXSTAT_DISABLED) { | |
504 | i = -1; | |
505 | break; | |
506 | } | |
507 | } else { | |
508 | value &= B43legacy_DMA32_RXSTATE; | |
509 | if (value == B43legacy_DMA32_RXSTAT_DISABLED) { | |
510 | i = -1; | |
511 | break; | |
512 | } | |
513 | } | |
514 | msleep(1); | |
515 | } | |
516 | if (i != -1) { | |
517 | b43legacyerr(dev->wl, "DMA RX reset timed out\n"); | |
518 | return -ENODEV; | |
519 | } | |
520 | ||
521 | return 0; | |
522 | } | |
523 | ||
524 | /* Reset the RX DMA channel */ | |
8e118f0e SB |
525 | static int b43legacy_dmacontroller_tx_reset(struct b43legacy_wldev *dev, |
526 | u16 mmio_base, | |
527 | enum b43legacy_dmatype type) | |
75388acd LF |
528 | { |
529 | int i; | |
530 | u32 value; | |
531 | u16 offset; | |
532 | ||
533 | might_sleep(); | |
534 | ||
535 | for (i = 0; i < 10; i++) { | |
8e118f0e SB |
536 | offset = (type == B43legacy_DMA_64BIT) ? |
537 | B43legacy_DMA64_TXSTATUS : B43legacy_DMA32_TXSTATUS; | |
75388acd | 538 | value = b43legacy_read32(dev, mmio_base + offset); |
8e118f0e | 539 | if (type == B43legacy_DMA_64BIT) { |
75388acd LF |
540 | value &= B43legacy_DMA64_TXSTAT; |
541 | if (value == B43legacy_DMA64_TXSTAT_DISABLED || | |
542 | value == B43legacy_DMA64_TXSTAT_IDLEWAIT || | |
543 | value == B43legacy_DMA64_TXSTAT_STOPPED) | |
544 | break; | |
545 | } else { | |
546 | value &= B43legacy_DMA32_TXSTATE; | |
547 | if (value == B43legacy_DMA32_TXSTAT_DISABLED || | |
548 | value == B43legacy_DMA32_TXSTAT_IDLEWAIT || | |
549 | value == B43legacy_DMA32_TXSTAT_STOPPED) | |
550 | break; | |
551 | } | |
552 | msleep(1); | |
553 | } | |
8e118f0e SB |
554 | offset = (type == B43legacy_DMA_64BIT) ? B43legacy_DMA64_TXCTL : |
555 | B43legacy_DMA32_TXCTL; | |
75388acd LF |
556 | b43legacy_write32(dev, mmio_base + offset, 0); |
557 | for (i = 0; i < 10; i++) { | |
8e118f0e SB |
558 | offset = (type == B43legacy_DMA_64BIT) ? |
559 | B43legacy_DMA64_TXSTATUS : B43legacy_DMA32_TXSTATUS; | |
75388acd | 560 | value = b43legacy_read32(dev, mmio_base + offset); |
8e118f0e | 561 | if (type == B43legacy_DMA_64BIT) { |
75388acd LF |
562 | value &= B43legacy_DMA64_TXSTAT; |
563 | if (value == B43legacy_DMA64_TXSTAT_DISABLED) { | |
564 | i = -1; | |
565 | break; | |
566 | } | |
567 | } else { | |
568 | value &= B43legacy_DMA32_TXSTATE; | |
569 | if (value == B43legacy_DMA32_TXSTAT_DISABLED) { | |
570 | i = -1; | |
571 | break; | |
572 | } | |
573 | } | |
574 | msleep(1); | |
575 | } | |
576 | if (i != -1) { | |
577 | b43legacyerr(dev->wl, "DMA TX reset timed out\n"); | |
578 | return -ENODEV; | |
579 | } | |
580 | /* ensure the reset is completed. */ | |
581 | msleep(1); | |
582 | ||
583 | return 0; | |
584 | } | |
585 | ||
8e118f0e SB |
586 | /* Check if a DMA mapping address is invalid. */ |
587 | static bool b43legacy_dma_mapping_error(struct b43legacy_dmaring *ring, | |
dc4ae1f4 SB |
588 | dma_addr_t addr, |
589 | size_t buffersize, | |
590 | bool dma_to_device) | |
8e118f0e | 591 | { |
4e803132 | 592 | if (unlikely(dma_mapping_error(ring->dev->dev->dma_dev, addr))) |
8e118f0e SB |
593 | return 1; |
594 | ||
595 | switch (ring->type) { | |
596 | case B43legacy_DMA_30BIT: | |
597 | if ((u64)addr + buffersize > (1ULL << 30)) | |
dc4ae1f4 | 598 | goto address_error; |
8e118f0e SB |
599 | break; |
600 | case B43legacy_DMA_32BIT: | |
601 | if ((u64)addr + buffersize > (1ULL << 32)) | |
dc4ae1f4 | 602 | goto address_error; |
8e118f0e SB |
603 | break; |
604 | case B43legacy_DMA_64BIT: | |
605 | /* Currently we can't have addresses beyond 64 bits in the kernel. */ | |
606 | break; | |
607 | } | |
608 | ||
609 | /* The address is OK. */ | |
610 | return 0; | |
dc4ae1f4 SB |
611 | |
612 | address_error: | |
613 | /* We can't support this address. Unmap it again. */ | |
614 | unmap_descbuffer(ring, addr, buffersize, dma_to_device); | |
615 | ||
616 | return 1; | |
8e118f0e SB |
617 | } |
618 | ||
75388acd LF |
619 | static int setup_rx_descbuffer(struct b43legacy_dmaring *ring, |
620 | struct b43legacy_dmadesc_generic *desc, | |
621 | struct b43legacy_dmadesc_meta *meta, | |
622 | gfp_t gfp_flags) | |
623 | { | |
624 | struct b43legacy_rxhdr_fw3 *rxhdr; | |
625 | struct b43legacy_hwtxstatus *txstat; | |
626 | dma_addr_t dmaaddr; | |
627 | struct sk_buff *skb; | |
628 | ||
629 | B43legacy_WARN_ON(ring->tx); | |
630 | ||
631 | skb = __dev_alloc_skb(ring->rx_buffersize, gfp_flags); | |
632 | if (unlikely(!skb)) | |
633 | return -ENOMEM; | |
634 | dmaaddr = map_descbuffer(ring, skb->data, | |
635 | ring->rx_buffersize, 0); | |
dc4ae1f4 | 636 | if (b43legacy_dma_mapping_error(ring, dmaaddr, ring->rx_buffersize, 0)) { |
75388acd LF |
637 | /* ugh. try to realloc in zone_dma */ |
638 | gfp_flags |= GFP_DMA; | |
639 | ||
640 | dev_kfree_skb_any(skb); | |
641 | ||
642 | skb = __dev_alloc_skb(ring->rx_buffersize, gfp_flags); | |
643 | if (unlikely(!skb)) | |
644 | return -ENOMEM; | |
645 | dmaaddr = map_descbuffer(ring, skb->data, | |
646 | ring->rx_buffersize, 0); | |
647 | } | |
648 | ||
dc4ae1f4 | 649 | if (b43legacy_dma_mapping_error(ring, dmaaddr, ring->rx_buffersize, 0)) { |
75388acd LF |
650 | dev_kfree_skb_any(skb); |
651 | return -EIO; | |
652 | } | |
653 | ||
654 | meta->skb = skb; | |
655 | meta->dmaaddr = dmaaddr; | |
656 | ring->ops->fill_descriptor(ring, desc, dmaaddr, | |
657 | ring->rx_buffersize, 0, 0, 0); | |
658 | ||
659 | rxhdr = (struct b43legacy_rxhdr_fw3 *)(skb->data); | |
660 | rxhdr->frame_len = 0; | |
661 | txstat = (struct b43legacy_hwtxstatus *)(skb->data); | |
662 | txstat->cookie = 0; | |
663 | ||
664 | return 0; | |
665 | } | |
666 | ||
667 | /* Allocate the initial descbuffers. | |
668 | * This is used for an RX ring only. | |
669 | */ | |
670 | static int alloc_initial_descbuffers(struct b43legacy_dmaring *ring) | |
671 | { | |
672 | int i; | |
673 | int err = -ENOMEM; | |
674 | struct b43legacy_dmadesc_generic *desc; | |
675 | struct b43legacy_dmadesc_meta *meta; | |
676 | ||
677 | for (i = 0; i < ring->nr_slots; i++) { | |
678 | desc = ring->ops->idx2desc(ring, i, &meta); | |
679 | ||
680 | err = setup_rx_descbuffer(ring, desc, meta, GFP_KERNEL); | |
681 | if (err) { | |
682 | b43legacyerr(ring->dev->wl, | |
683 | "Failed to allocate initial descbuffers\n"); | |
684 | goto err_unwind; | |
685 | } | |
686 | } | |
687 | mb(); /* all descbuffer setup before next line */ | |
688 | ring->used_slots = ring->nr_slots; | |
689 | err = 0; | |
690 | out: | |
691 | return err; | |
692 | ||
693 | err_unwind: | |
694 | for (i--; i >= 0; i--) { | |
695 | desc = ring->ops->idx2desc(ring, i, &meta); | |
696 | ||
697 | unmap_descbuffer(ring, meta->dmaaddr, ring->rx_buffersize, 0); | |
698 | dev_kfree_skb(meta->skb); | |
699 | } | |
700 | goto out; | |
701 | } | |
702 | ||
703 | /* Do initial setup of the DMA controller. | |
704 | * Reset the controller, write the ring busaddress | |
705 | * and switch the "enable" bit on. | |
706 | */ | |
707 | static int dmacontroller_setup(struct b43legacy_dmaring *ring) | |
708 | { | |
709 | int err = 0; | |
710 | u32 value; | |
711 | u32 addrext; | |
712 | u32 trans = ssb_dma_translation(ring->dev->dev); | |
713 | ||
714 | if (ring->tx) { | |
8e118f0e | 715 | if (ring->type == B43legacy_DMA_64BIT) { |
75388acd LF |
716 | u64 ringbase = (u64)(ring->dmabase); |
717 | ||
718 | addrext = ((ringbase >> 32) & SSB_DMA_TRANSLATION_MASK) | |
719 | >> SSB_DMA_TRANSLATION_SHIFT; | |
720 | value = B43legacy_DMA64_TXENABLE; | |
721 | value |= (addrext << B43legacy_DMA64_TXADDREXT_SHIFT) | |
722 | & B43legacy_DMA64_TXADDREXT_MASK; | |
723 | b43legacy_dma_write(ring, B43legacy_DMA64_TXCTL, | |
724 | value); | |
725 | b43legacy_dma_write(ring, B43legacy_DMA64_TXRINGLO, | |
726 | (ringbase & 0xFFFFFFFF)); | |
727 | b43legacy_dma_write(ring, B43legacy_DMA64_TXRINGHI, | |
728 | ((ringbase >> 32) | |
729 | & ~SSB_DMA_TRANSLATION_MASK) | |
730 | | trans); | |
731 | } else { | |
732 | u32 ringbase = (u32)(ring->dmabase); | |
733 | ||
734 | addrext = (ringbase & SSB_DMA_TRANSLATION_MASK) | |
735 | >> SSB_DMA_TRANSLATION_SHIFT; | |
736 | value = B43legacy_DMA32_TXENABLE; | |
737 | value |= (addrext << B43legacy_DMA32_TXADDREXT_SHIFT) | |
738 | & B43legacy_DMA32_TXADDREXT_MASK; | |
739 | b43legacy_dma_write(ring, B43legacy_DMA32_TXCTL, | |
740 | value); | |
741 | b43legacy_dma_write(ring, B43legacy_DMA32_TXRING, | |
742 | (ringbase & | |
743 | ~SSB_DMA_TRANSLATION_MASK) | |
744 | | trans); | |
745 | } | |
746 | } else { | |
747 | err = alloc_initial_descbuffers(ring); | |
748 | if (err) | |
749 | goto out; | |
8e118f0e | 750 | if (ring->type == B43legacy_DMA_64BIT) { |
75388acd LF |
751 | u64 ringbase = (u64)(ring->dmabase); |
752 | ||
753 | addrext = ((ringbase >> 32) & SSB_DMA_TRANSLATION_MASK) | |
754 | >> SSB_DMA_TRANSLATION_SHIFT; | |
755 | value = (ring->frameoffset << | |
756 | B43legacy_DMA64_RXFROFF_SHIFT); | |
757 | value |= B43legacy_DMA64_RXENABLE; | |
758 | value |= (addrext << B43legacy_DMA64_RXADDREXT_SHIFT) | |
759 | & B43legacy_DMA64_RXADDREXT_MASK; | |
760 | b43legacy_dma_write(ring, B43legacy_DMA64_RXCTL, | |
761 | value); | |
762 | b43legacy_dma_write(ring, B43legacy_DMA64_RXRINGLO, | |
763 | (ringbase & 0xFFFFFFFF)); | |
764 | b43legacy_dma_write(ring, B43legacy_DMA64_RXRINGHI, | |
765 | ((ringbase >> 32) & | |
766 | ~SSB_DMA_TRANSLATION_MASK) | | |
767 | trans); | |
768 | b43legacy_dma_write(ring, B43legacy_DMA64_RXINDEX, | |
769 | 200); | |
770 | } else { | |
771 | u32 ringbase = (u32)(ring->dmabase); | |
772 | ||
773 | addrext = (ringbase & SSB_DMA_TRANSLATION_MASK) | |
774 | >> SSB_DMA_TRANSLATION_SHIFT; | |
775 | value = (ring->frameoffset << | |
776 | B43legacy_DMA32_RXFROFF_SHIFT); | |
777 | value |= B43legacy_DMA32_RXENABLE; | |
778 | value |= (addrext << | |
779 | B43legacy_DMA32_RXADDREXT_SHIFT) | |
780 | & B43legacy_DMA32_RXADDREXT_MASK; | |
781 | b43legacy_dma_write(ring, B43legacy_DMA32_RXCTL, | |
782 | value); | |
783 | b43legacy_dma_write(ring, B43legacy_DMA32_RXRING, | |
784 | (ringbase & | |
785 | ~SSB_DMA_TRANSLATION_MASK) | |
786 | | trans); | |
787 | b43legacy_dma_write(ring, B43legacy_DMA32_RXINDEX, | |
788 | 200); | |
789 | } | |
790 | } | |
791 | ||
792 | out: | |
793 | return err; | |
794 | } | |
795 | ||
796 | /* Shutdown the DMA controller. */ | |
797 | static void dmacontroller_cleanup(struct b43legacy_dmaring *ring) | |
798 | { | |
799 | if (ring->tx) { | |
800 | b43legacy_dmacontroller_tx_reset(ring->dev, ring->mmio_base, | |
8e118f0e SB |
801 | ring->type); |
802 | if (ring->type == B43legacy_DMA_64BIT) { | |
75388acd LF |
803 | b43legacy_dma_write(ring, B43legacy_DMA64_TXRINGLO, 0); |
804 | b43legacy_dma_write(ring, B43legacy_DMA64_TXRINGHI, 0); | |
805 | } else | |
806 | b43legacy_dma_write(ring, B43legacy_DMA32_TXRING, 0); | |
807 | } else { | |
808 | b43legacy_dmacontroller_rx_reset(ring->dev, ring->mmio_base, | |
8e118f0e SB |
809 | ring->type); |
810 | if (ring->type == B43legacy_DMA_64BIT) { | |
75388acd LF |
811 | b43legacy_dma_write(ring, B43legacy_DMA64_RXRINGLO, 0); |
812 | b43legacy_dma_write(ring, B43legacy_DMA64_RXRINGHI, 0); | |
813 | } else | |
814 | b43legacy_dma_write(ring, B43legacy_DMA32_RXRING, 0); | |
815 | } | |
816 | } | |
817 | ||
818 | static void free_all_descbuffers(struct b43legacy_dmaring *ring) | |
819 | { | |
820 | struct b43legacy_dmadesc_generic *desc; | |
821 | struct b43legacy_dmadesc_meta *meta; | |
822 | int i; | |
823 | ||
824 | if (!ring->used_slots) | |
825 | return; | |
826 | for (i = 0; i < ring->nr_slots; i++) { | |
827 | desc = ring->ops->idx2desc(ring, i, &meta); | |
828 | ||
829 | if (!meta->skb) { | |
830 | B43legacy_WARN_ON(!ring->tx); | |
831 | continue; | |
832 | } | |
833 | if (ring->tx) | |
834 | unmap_descbuffer(ring, meta->dmaaddr, | |
835 | meta->skb->len, 1); | |
836 | else | |
837 | unmap_descbuffer(ring, meta->dmaaddr, | |
838 | ring->rx_buffersize, 0); | |
839 | free_descriptor_buffer(ring, meta, 0); | |
840 | } | |
841 | } | |
842 | ||
843 | static u64 supported_dma_mask(struct b43legacy_wldev *dev) | |
844 | { | |
845 | u32 tmp; | |
846 | u16 mmio_base; | |
847 | ||
848 | tmp = b43legacy_read32(dev, SSB_TMSHIGH); | |
849 | if (tmp & SSB_TMSHIGH_DMA64) | |
6a35528a | 850 | return DMA_BIT_MASK(64); |
75388acd LF |
851 | mmio_base = b43legacy_dmacontroller_base(0, 0); |
852 | b43legacy_write32(dev, | |
853 | mmio_base + B43legacy_DMA32_TXCTL, | |
854 | B43legacy_DMA32_TXADDREXT_MASK); | |
855 | tmp = b43legacy_read32(dev, mmio_base + | |
856 | B43legacy_DMA32_TXCTL); | |
857 | if (tmp & B43legacy_DMA32_TXADDREXT_MASK) | |
284901a9 | 858 | return DMA_BIT_MASK(32); |
75388acd | 859 | |
28b76796 | 860 | return DMA_BIT_MASK(30); |
75388acd LF |
861 | } |
862 | ||
70197ede LF |
863 | static enum b43legacy_dmatype dma_mask_to_engine_type(u64 dmamask) |
864 | { | |
28b76796 | 865 | if (dmamask == DMA_BIT_MASK(30)) |
70197ede | 866 | return B43legacy_DMA_30BIT; |
284901a9 | 867 | if (dmamask == DMA_BIT_MASK(32)) |
70197ede | 868 | return B43legacy_DMA_32BIT; |
6a35528a | 869 | if (dmamask == DMA_BIT_MASK(64)) |
70197ede LF |
870 | return B43legacy_DMA_64BIT; |
871 | B43legacy_WARN_ON(1); | |
872 | return B43legacy_DMA_30BIT; | |
873 | } | |
874 | ||
75388acd LF |
875 | /* Main initialization function. */ |
876 | static | |
8e118f0e SB |
877 | struct b43legacy_dmaring *b43legacy_setup_dmaring(struct b43legacy_wldev *dev, |
878 | int controller_index, | |
879 | int for_tx, | |
880 | enum b43legacy_dmatype type) | |
75388acd LF |
881 | { |
882 | struct b43legacy_dmaring *ring; | |
883 | int err; | |
884 | int nr_slots; | |
885 | dma_addr_t dma_test; | |
886 | ||
887 | ring = kzalloc(sizeof(*ring), GFP_KERNEL); | |
888 | if (!ring) | |
889 | goto out; | |
8e118f0e | 890 | ring->type = type; |
2f9ec47d | 891 | ring->dev = dev; |
75388acd LF |
892 | |
893 | nr_slots = B43legacy_RXRING_SLOTS; | |
894 | if (for_tx) | |
895 | nr_slots = B43legacy_TXRING_SLOTS; | |
896 | ||
897 | ring->meta = kcalloc(nr_slots, sizeof(struct b43legacy_dmadesc_meta), | |
898 | GFP_KERNEL); | |
899 | if (!ring->meta) | |
900 | goto err_kfree_ring; | |
901 | if (for_tx) { | |
902 | ring->txhdr_cache = kcalloc(nr_slots, | |
903 | sizeof(struct b43legacy_txhdr_fw3), | |
904 | GFP_KERNEL); | |
905 | if (!ring->txhdr_cache) | |
906 | goto err_kfree_meta; | |
907 | ||
908 | /* test for ability to dma to txhdr_cache */ | |
4e803132 | 909 | dma_test = dma_map_single(dev->dev->dma_dev, ring->txhdr_cache, |
f225763a MB |
910 | sizeof(struct b43legacy_txhdr_fw3), |
911 | DMA_TO_DEVICE); | |
75388acd | 912 | |
8e118f0e | 913 | if (b43legacy_dma_mapping_error(ring, dma_test, |
dc4ae1f4 | 914 | sizeof(struct b43legacy_txhdr_fw3), 1)) { |
75388acd LF |
915 | /* ugh realloc */ |
916 | kfree(ring->txhdr_cache); | |
917 | ring->txhdr_cache = kcalloc(nr_slots, | |
918 | sizeof(struct b43legacy_txhdr_fw3), | |
919 | GFP_KERNEL | GFP_DMA); | |
920 | if (!ring->txhdr_cache) | |
921 | goto err_kfree_meta; | |
922 | ||
4e803132 | 923 | dma_test = dma_map_single(dev->dev->dma_dev, |
75388acd LF |
924 | ring->txhdr_cache, |
925 | sizeof(struct b43legacy_txhdr_fw3), | |
926 | DMA_TO_DEVICE); | |
927 | ||
8e118f0e | 928 | if (b43legacy_dma_mapping_error(ring, dma_test, |
dc4ae1f4 | 929 | sizeof(struct b43legacy_txhdr_fw3), 1)) |
75388acd LF |
930 | goto err_kfree_txhdr_cache; |
931 | } | |
932 | ||
4e803132 FT |
933 | dma_unmap_single(dev->dev->dma_dev, dma_test, |
934 | sizeof(struct b43legacy_txhdr_fw3), | |
935 | DMA_TO_DEVICE); | |
75388acd LF |
936 | } |
937 | ||
75388acd | 938 | ring->nr_slots = nr_slots; |
8e118f0e | 939 | ring->mmio_base = b43legacy_dmacontroller_base(type, controller_index); |
75388acd | 940 | ring->index = controller_index; |
8e118f0e | 941 | if (type == B43legacy_DMA_64BIT) |
75388acd LF |
942 | ring->ops = &dma64_ops; |
943 | else | |
944 | ring->ops = &dma32_ops; | |
945 | if (for_tx) { | |
946 | ring->tx = 1; | |
947 | ring->current_slot = -1; | |
948 | } else { | |
949 | if (ring->index == 0) { | |
950 | ring->rx_buffersize = B43legacy_DMA0_RX_BUFFERSIZE; | |
951 | ring->frameoffset = B43legacy_DMA0_RX_FRAMEOFFSET; | |
952 | } else if (ring->index == 3) { | |
953 | ring->rx_buffersize = B43legacy_DMA3_RX_BUFFERSIZE; | |
954 | ring->frameoffset = B43legacy_DMA3_RX_FRAMEOFFSET; | |
955 | } else | |
956 | B43legacy_WARN_ON(1); | |
957 | } | |
958 | spin_lock_init(&ring->lock); | |
959 | #ifdef CONFIG_B43LEGACY_DEBUG | |
960 | ring->last_injected_overflow = jiffies; | |
961 | #endif | |
962 | ||
963 | err = alloc_ringmemory(ring); | |
964 | if (err) | |
965 | goto err_kfree_txhdr_cache; | |
966 | err = dmacontroller_setup(ring); | |
967 | if (err) | |
968 | goto err_free_ringmemory; | |
969 | ||
970 | out: | |
971 | return ring; | |
972 | ||
973 | err_free_ringmemory: | |
974 | free_ringmemory(ring); | |
975 | err_kfree_txhdr_cache: | |
976 | kfree(ring->txhdr_cache); | |
977 | err_kfree_meta: | |
978 | kfree(ring->meta); | |
979 | err_kfree_ring: | |
980 | kfree(ring); | |
981 | ring = NULL; | |
982 | goto out; | |
983 | } | |
984 | ||
985 | /* Main cleanup function. */ | |
986 | static void b43legacy_destroy_dmaring(struct b43legacy_dmaring *ring) | |
987 | { | |
988 | if (!ring) | |
989 | return; | |
990 | ||
8e118f0e SB |
991 | b43legacydbg(ring->dev->wl, "DMA-%u 0x%04X (%s) max used slots:" |
992 | " %d/%d\n", (unsigned int)(ring->type), ring->mmio_base, | |
993 | (ring->tx) ? "TX" : "RX", ring->max_used_slots, | |
994 | ring->nr_slots); | |
75388acd LF |
995 | /* Device IRQs are disabled prior entering this function, |
996 | * so no need to take care of concurrency with rx handler stuff. | |
997 | */ | |
998 | dmacontroller_cleanup(ring); | |
999 | free_all_descbuffers(ring); | |
1000 | free_ringmemory(ring); | |
1001 | ||
1002 | kfree(ring->txhdr_cache); | |
1003 | kfree(ring->meta); | |
1004 | kfree(ring); | |
1005 | } | |
1006 | ||
1007 | void b43legacy_dma_free(struct b43legacy_wldev *dev) | |
1008 | { | |
1009 | struct b43legacy_dma *dma; | |
1010 | ||
1011 | if (b43legacy_using_pio(dev)) | |
1012 | return; | |
1013 | dma = &dev->dma; | |
1014 | ||
1015 | b43legacy_destroy_dmaring(dma->rx_ring3); | |
1016 | dma->rx_ring3 = NULL; | |
1017 | b43legacy_destroy_dmaring(dma->rx_ring0); | |
1018 | dma->rx_ring0 = NULL; | |
1019 | ||
1020 | b43legacy_destroy_dmaring(dma->tx_ring5); | |
1021 | dma->tx_ring5 = NULL; | |
1022 | b43legacy_destroy_dmaring(dma->tx_ring4); | |
1023 | dma->tx_ring4 = NULL; | |
1024 | b43legacy_destroy_dmaring(dma->tx_ring3); | |
1025 | dma->tx_ring3 = NULL; | |
1026 | b43legacy_destroy_dmaring(dma->tx_ring2); | |
1027 | dma->tx_ring2 = NULL; | |
1028 | b43legacy_destroy_dmaring(dma->tx_ring1); | |
1029 | dma->tx_ring1 = NULL; | |
1030 | b43legacy_destroy_dmaring(dma->tx_ring0); | |
1031 | dma->tx_ring0 = NULL; | |
1032 | } | |
1033 | ||
70197ede LF |
1034 | static int b43legacy_dma_set_mask(struct b43legacy_wldev *dev, u64 mask) |
1035 | { | |
1036 | u64 orig_mask = mask; | |
1037 | bool fallback = 0; | |
1038 | int err; | |
1039 | ||
1040 | /* Try to set the DMA mask. If it fails, try falling back to a | |
1041 | * lower mask, as we can always also support a lower one. */ | |
1042 | while (1) { | |
4e803132 FT |
1043 | err = dma_set_mask(dev->dev->dma_dev, mask); |
1044 | if (!err) { | |
1045 | err = dma_set_coherent_mask(dev->dev->dma_dev, mask); | |
1046 | if (!err) | |
1047 | break; | |
1048 | } | |
6a35528a | 1049 | if (mask == DMA_BIT_MASK(64)) { |
284901a9 | 1050 | mask = DMA_BIT_MASK(32); |
70197ede LF |
1051 | fallback = 1; |
1052 | continue; | |
1053 | } | |
284901a9 | 1054 | if (mask == DMA_BIT_MASK(32)) { |
28b76796 | 1055 | mask = DMA_BIT_MASK(30); |
70197ede LF |
1056 | fallback = 1; |
1057 | continue; | |
1058 | } | |
1059 | b43legacyerr(dev->wl, "The machine/kernel does not support " | |
1060 | "the required %u-bit DMA mask\n", | |
1061 | (unsigned int)dma_mask_to_engine_type(orig_mask)); | |
1062 | return -EOPNOTSUPP; | |
1063 | } | |
1064 | if (fallback) { | |
1065 | b43legacyinfo(dev->wl, "DMA mask fallback from %u-bit to %u-" | |
1066 | "bit\n", | |
1067 | (unsigned int)dma_mask_to_engine_type(orig_mask), | |
1068 | (unsigned int)dma_mask_to_engine_type(mask)); | |
1069 | } | |
1070 | ||
1071 | return 0; | |
1072 | } | |
1073 | ||
75388acd LF |
1074 | int b43legacy_dma_init(struct b43legacy_wldev *dev) |
1075 | { | |
1076 | struct b43legacy_dma *dma = &dev->dma; | |
1077 | struct b43legacy_dmaring *ring; | |
1078 | int err; | |
1079 | u64 dmamask; | |
8e118f0e | 1080 | enum b43legacy_dmatype type; |
75388acd LF |
1081 | |
1082 | dmamask = supported_dma_mask(dev); | |
70197ede LF |
1083 | type = dma_mask_to_engine_type(dmamask); |
1084 | err = b43legacy_dma_set_mask(dev, dmamask); | |
75388acd | 1085 | if (err) { |
354807e0 | 1086 | #ifdef CONFIG_B43LEGACY_PIO |
75388acd LF |
1087 | b43legacywarn(dev->wl, "DMA for this device not supported. " |
1088 | "Falling back to PIO\n"); | |
1089 | dev->__using_pio = 1; | |
1090 | return -EAGAIN; | |
1091 | #else | |
1092 | b43legacyerr(dev->wl, "DMA for this device not supported and " | |
1093 | "no PIO support compiled in\n"); | |
1094 | return -EOPNOTSUPP; | |
1095 | #endif | |
1096 | } | |
1097 | ||
1098 | err = -ENOMEM; | |
1099 | /* setup TX DMA channels. */ | |
8e118f0e | 1100 | ring = b43legacy_setup_dmaring(dev, 0, 1, type); |
75388acd LF |
1101 | if (!ring) |
1102 | goto out; | |
1103 | dma->tx_ring0 = ring; | |
1104 | ||
8e118f0e | 1105 | ring = b43legacy_setup_dmaring(dev, 1, 1, type); |
75388acd LF |
1106 | if (!ring) |
1107 | goto err_destroy_tx0; | |
1108 | dma->tx_ring1 = ring; | |
1109 | ||
8e118f0e | 1110 | ring = b43legacy_setup_dmaring(dev, 2, 1, type); |
75388acd LF |
1111 | if (!ring) |
1112 | goto err_destroy_tx1; | |
1113 | dma->tx_ring2 = ring; | |
1114 | ||
8e118f0e | 1115 | ring = b43legacy_setup_dmaring(dev, 3, 1, type); |
75388acd LF |
1116 | if (!ring) |
1117 | goto err_destroy_tx2; | |
1118 | dma->tx_ring3 = ring; | |
1119 | ||
8e118f0e | 1120 | ring = b43legacy_setup_dmaring(dev, 4, 1, type); |
75388acd LF |
1121 | if (!ring) |
1122 | goto err_destroy_tx3; | |
1123 | dma->tx_ring4 = ring; | |
1124 | ||
8e118f0e | 1125 | ring = b43legacy_setup_dmaring(dev, 5, 1, type); |
75388acd LF |
1126 | if (!ring) |
1127 | goto err_destroy_tx4; | |
1128 | dma->tx_ring5 = ring; | |
1129 | ||
1130 | /* setup RX DMA channels. */ | |
8e118f0e | 1131 | ring = b43legacy_setup_dmaring(dev, 0, 0, type); |
75388acd LF |
1132 | if (!ring) |
1133 | goto err_destroy_tx5; | |
1134 | dma->rx_ring0 = ring; | |
1135 | ||
1136 | if (dev->dev->id.revision < 5) { | |
8e118f0e | 1137 | ring = b43legacy_setup_dmaring(dev, 3, 0, type); |
75388acd LF |
1138 | if (!ring) |
1139 | goto err_destroy_rx0; | |
1140 | dma->rx_ring3 = ring; | |
1141 | } | |
1142 | ||
8e118f0e | 1143 | b43legacydbg(dev->wl, "%u-bit DMA initialized\n", (unsigned int)type); |
75388acd LF |
1144 | err = 0; |
1145 | out: | |
1146 | return err; | |
1147 | ||
1148 | err_destroy_rx0: | |
1149 | b43legacy_destroy_dmaring(dma->rx_ring0); | |
1150 | dma->rx_ring0 = NULL; | |
1151 | err_destroy_tx5: | |
1152 | b43legacy_destroy_dmaring(dma->tx_ring5); | |
1153 | dma->tx_ring5 = NULL; | |
1154 | err_destroy_tx4: | |
1155 | b43legacy_destroy_dmaring(dma->tx_ring4); | |
1156 | dma->tx_ring4 = NULL; | |
1157 | err_destroy_tx3: | |
1158 | b43legacy_destroy_dmaring(dma->tx_ring3); | |
1159 | dma->tx_ring3 = NULL; | |
1160 | err_destroy_tx2: | |
1161 | b43legacy_destroy_dmaring(dma->tx_ring2); | |
1162 | dma->tx_ring2 = NULL; | |
1163 | err_destroy_tx1: | |
1164 | b43legacy_destroy_dmaring(dma->tx_ring1); | |
1165 | dma->tx_ring1 = NULL; | |
1166 | err_destroy_tx0: | |
1167 | b43legacy_destroy_dmaring(dma->tx_ring0); | |
1168 | dma->tx_ring0 = NULL; | |
1169 | goto out; | |
1170 | } | |
1171 | ||
1172 | /* Generate a cookie for the TX header. */ | |
1173 | static u16 generate_cookie(struct b43legacy_dmaring *ring, | |
1174 | int slot) | |
1175 | { | |
1176 | u16 cookie = 0x1000; | |
1177 | ||
1178 | /* Use the upper 4 bits of the cookie as | |
1179 | * DMA controller ID and store the slot number | |
1180 | * in the lower 12 bits. | |
1181 | * Note that the cookie must never be 0, as this | |
1182 | * is a special value used in RX path. | |
1183 | */ | |
1184 | switch (ring->index) { | |
1185 | case 0: | |
1186 | cookie = 0xA000; | |
1187 | break; | |
1188 | case 1: | |
1189 | cookie = 0xB000; | |
1190 | break; | |
1191 | case 2: | |
1192 | cookie = 0xC000; | |
1193 | break; | |
1194 | case 3: | |
1195 | cookie = 0xD000; | |
1196 | break; | |
1197 | case 4: | |
1198 | cookie = 0xE000; | |
1199 | break; | |
1200 | case 5: | |
1201 | cookie = 0xF000; | |
1202 | break; | |
1203 | } | |
1204 | B43legacy_WARN_ON(!(((u16)slot & 0xF000) == 0x0000)); | |
1205 | cookie |= (u16)slot; | |
1206 | ||
1207 | return cookie; | |
1208 | } | |
1209 | ||
1210 | /* Inspect a cookie and find out to which controller/slot it belongs. */ | |
1211 | static | |
1212 | struct b43legacy_dmaring *parse_cookie(struct b43legacy_wldev *dev, | |
1213 | u16 cookie, int *slot) | |
1214 | { | |
1215 | struct b43legacy_dma *dma = &dev->dma; | |
1216 | struct b43legacy_dmaring *ring = NULL; | |
1217 | ||
1218 | switch (cookie & 0xF000) { | |
1219 | case 0xA000: | |
1220 | ring = dma->tx_ring0; | |
1221 | break; | |
1222 | case 0xB000: | |
1223 | ring = dma->tx_ring1; | |
1224 | break; | |
1225 | case 0xC000: | |
1226 | ring = dma->tx_ring2; | |
1227 | break; | |
1228 | case 0xD000: | |
1229 | ring = dma->tx_ring3; | |
1230 | break; | |
1231 | case 0xE000: | |
1232 | ring = dma->tx_ring4; | |
1233 | break; | |
1234 | case 0xF000: | |
1235 | ring = dma->tx_ring5; | |
1236 | break; | |
1237 | default: | |
1238 | B43legacy_WARN_ON(1); | |
1239 | } | |
1240 | *slot = (cookie & 0x0FFF); | |
1241 | B43legacy_WARN_ON(!(ring && *slot >= 0 && *slot < ring->nr_slots)); | |
1242 | ||
1243 | return ring; | |
1244 | } | |
1245 | ||
1246 | static int dma_tx_fragment(struct b43legacy_dmaring *ring, | |
d2d8cda7 | 1247 | struct sk_buff **in_skb) |
75388acd | 1248 | { |
d2d8cda7 | 1249 | struct sk_buff *skb = *in_skb; |
75388acd | 1250 | const struct b43legacy_dma_ops *ops = ring->ops; |
e039fa4a | 1251 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
75388acd | 1252 | u8 *header; |
8dd0100c | 1253 | int slot, old_top_slot, old_used_slots; |
75388acd LF |
1254 | int err; |
1255 | struct b43legacy_dmadesc_generic *desc; | |
1256 | struct b43legacy_dmadesc_meta *meta; | |
1257 | struct b43legacy_dmadesc_meta *meta_hdr; | |
1258 | struct sk_buff *bounce_skb; | |
1259 | ||
1260 | #define SLOTS_PER_PACKET 2 | |
1261 | B43legacy_WARN_ON(skb_shinfo(skb)->nr_frags != 0); | |
1262 | ||
8dd0100c SB |
1263 | old_top_slot = ring->current_slot; |
1264 | old_used_slots = ring->used_slots; | |
1265 | ||
75388acd LF |
1266 | /* Get a slot for the header. */ |
1267 | slot = request_slot(ring); | |
1268 | desc = ops->idx2desc(ring, slot, &meta_hdr); | |
1269 | memset(meta_hdr, 0, sizeof(*meta_hdr)); | |
1270 | ||
1271 | header = &(ring->txhdr_cache[slot * sizeof( | |
1272 | struct b43legacy_txhdr_fw3)]); | |
9eca9a8e | 1273 | err = b43legacy_generate_txhdr(ring->dev, header, |
e039fa4a | 1274 | skb->data, skb->len, info, |
75388acd | 1275 | generate_cookie(ring, slot)); |
8dd0100c SB |
1276 | if (unlikely(err)) { |
1277 | ring->current_slot = old_top_slot; | |
1278 | ring->used_slots = old_used_slots; | |
9eca9a8e | 1279 | return err; |
8dd0100c | 1280 | } |
75388acd LF |
1281 | |
1282 | meta_hdr->dmaaddr = map_descbuffer(ring, (unsigned char *)header, | |
8e118f0e SB |
1283 | sizeof(struct b43legacy_txhdr_fw3), 1); |
1284 | if (b43legacy_dma_mapping_error(ring, meta_hdr->dmaaddr, | |
dc4ae1f4 | 1285 | sizeof(struct b43legacy_txhdr_fw3), 1)) { |
8e118f0e SB |
1286 | ring->current_slot = old_top_slot; |
1287 | ring->used_slots = old_used_slots; | |
75388acd | 1288 | return -EIO; |
8e118f0e | 1289 | } |
75388acd LF |
1290 | ops->fill_descriptor(ring, desc, meta_hdr->dmaaddr, |
1291 | sizeof(struct b43legacy_txhdr_fw3), 1, 0, 0); | |
1292 | ||
1293 | /* Get a slot for the payload. */ | |
1294 | slot = request_slot(ring); | |
1295 | desc = ops->idx2desc(ring, slot, &meta); | |
1296 | memset(meta, 0, sizeof(*meta)); | |
1297 | ||
75388acd LF |
1298 | meta->skb = skb; |
1299 | meta->is_last_fragment = 1; | |
1300 | ||
1301 | meta->dmaaddr = map_descbuffer(ring, skb->data, skb->len, 1); | |
1302 | /* create a bounce buffer in zone_dma on mapping failure. */ | |
dc4ae1f4 | 1303 | if (b43legacy_dma_mapping_error(ring, meta->dmaaddr, skb->len, 1)) { |
75388acd LF |
1304 | bounce_skb = __dev_alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA); |
1305 | if (!bounce_skb) { | |
8dd0100c SB |
1306 | ring->current_slot = old_top_slot; |
1307 | ring->used_slots = old_used_slots; | |
75388acd LF |
1308 | err = -ENOMEM; |
1309 | goto out_unmap_hdr; | |
1310 | } | |
1311 | ||
1312 | memcpy(skb_put(bounce_skb, skb->len), skb->data, skb->len); | |
d2d8cda7 LF |
1313 | memcpy(bounce_skb->cb, skb->cb, sizeof(skb->cb)); |
1314 | bounce_skb->dev = skb->dev; | |
1315 | skb_set_queue_mapping(bounce_skb, skb_get_queue_mapping(skb)); | |
1316 | info = IEEE80211_SKB_CB(bounce_skb); | |
1317 | ||
75388acd LF |
1318 | dev_kfree_skb_any(skb); |
1319 | skb = bounce_skb; | |
d2d8cda7 | 1320 | *in_skb = bounce_skb; |
75388acd LF |
1321 | meta->skb = skb; |
1322 | meta->dmaaddr = map_descbuffer(ring, skb->data, skb->len, 1); | |
dc4ae1f4 | 1323 | if (b43legacy_dma_mapping_error(ring, meta->dmaaddr, skb->len, 1)) { |
8dd0100c SB |
1324 | ring->current_slot = old_top_slot; |
1325 | ring->used_slots = old_used_slots; | |
75388acd LF |
1326 | err = -EIO; |
1327 | goto out_free_bounce; | |
1328 | } | |
1329 | } | |
1330 | ||
1331 | ops->fill_descriptor(ring, desc, meta->dmaaddr, | |
1332 | skb->len, 0, 1, 1); | |
1333 | ||
1334 | wmb(); /* previous stuff MUST be done */ | |
1335 | /* Now transfer the whole frame. */ | |
1336 | ops->poke_tx(ring, next_slot(ring, slot)); | |
1337 | return 0; | |
1338 | ||
1339 | out_free_bounce: | |
1340 | dev_kfree_skb_any(skb); | |
1341 | out_unmap_hdr: | |
1342 | unmap_descbuffer(ring, meta_hdr->dmaaddr, | |
1343 | sizeof(struct b43legacy_txhdr_fw3), 1); | |
1344 | return err; | |
1345 | } | |
1346 | ||
1347 | static inline | |
1348 | int should_inject_overflow(struct b43legacy_dmaring *ring) | |
1349 | { | |
1350 | #ifdef CONFIG_B43LEGACY_DEBUG | |
1351 | if (unlikely(b43legacy_debug(ring->dev, | |
1352 | B43legacy_DBG_DMAOVERFLOW))) { | |
1353 | /* Check if we should inject another ringbuffer overflow | |
1354 | * to test handling of this situation in the stack. */ | |
1355 | unsigned long next_overflow; | |
1356 | ||
1357 | next_overflow = ring->last_injected_overflow + HZ; | |
1358 | if (time_after(jiffies, next_overflow)) { | |
1359 | ring->last_injected_overflow = jiffies; | |
1360 | b43legacydbg(ring->dev->wl, | |
1361 | "Injecting TX ring overflow on " | |
1362 | "DMA controller %d\n", ring->index); | |
1363 | return 1; | |
1364 | } | |
1365 | } | |
1366 | #endif /* CONFIG_B43LEGACY_DEBUG */ | |
1367 | return 0; | |
1368 | } | |
1369 | ||
1370 | int b43legacy_dma_tx(struct b43legacy_wldev *dev, | |
e039fa4a | 1371 | struct sk_buff *skb) |
75388acd LF |
1372 | { |
1373 | struct b43legacy_dmaring *ring; | |
d2d8cda7 | 1374 | struct ieee80211_hdr *hdr; |
75388acd LF |
1375 | int err = 0; |
1376 | unsigned long flags; | |
d2d8cda7 | 1377 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
75388acd | 1378 | |
e2530083 | 1379 | ring = priority_to_txring(dev, skb_get_queue_mapping(skb)); |
75388acd LF |
1380 | spin_lock_irqsave(&ring->lock, flags); |
1381 | B43legacy_WARN_ON(!ring->tx); | |
c1be5152 LF |
1382 | |
1383 | if (unlikely(ring->stopped)) { | |
1384 | /* We get here only because of a bug in mac80211. | |
1385 | * Because of a race, one packet may be queued after | |
1386 | * the queue is stopped, thus we got called when we shouldn't. | |
1387 | * For now, just refuse the transmit. */ | |
1388 | if (b43legacy_debug(dev, B43legacy_DBG_DMAVERBOSE)) | |
1389 | b43legacyerr(dev->wl, "Packet after queue stopped\n"); | |
1390 | err = -ENOSPC; | |
1391 | goto out_unlock; | |
1392 | } | |
1393 | ||
1394 | if (unlikely(WARN_ON(free_slots(ring) < SLOTS_PER_PACKET))) { | |
1395 | /* If we get here, we have a real error with the queue | |
1396 | * full, but queues not stopped. */ | |
1397 | b43legacyerr(dev->wl, "DMA queue overflow\n"); | |
75388acd LF |
1398 | err = -ENOSPC; |
1399 | goto out_unlock; | |
1400 | } | |
75388acd | 1401 | |
d2d8cda7 LF |
1402 | /* dma_tx_fragment might reallocate the skb, so invalidate pointers pointing |
1403 | * into the skb data or cb now. */ | |
1404 | hdr = NULL; | |
1405 | info = NULL; | |
1406 | err = dma_tx_fragment(ring, &skb); | |
9eca9a8e SB |
1407 | if (unlikely(err == -ENOKEY)) { |
1408 | /* Drop this packet, as we don't have the encryption key | |
1409 | * anymore and must not transmit it unencrypted. */ | |
1410 | dev_kfree_skb_any(skb); | |
1411 | err = 0; | |
1412 | goto out_unlock; | |
1413 | } | |
75388acd LF |
1414 | if (unlikely(err)) { |
1415 | b43legacyerr(dev->wl, "DMA tx mapping failure\n"); | |
1416 | goto out_unlock; | |
1417 | } | |
75388acd LF |
1418 | if ((free_slots(ring) < SLOTS_PER_PACKET) || |
1419 | should_inject_overflow(ring)) { | |
1420 | /* This TX ring is full. */ | |
1421 | ieee80211_stop_queue(dev->wl->hw, txring_to_priority(ring)); | |
1422 | ring->stopped = 1; | |
1423 | if (b43legacy_debug(dev, B43legacy_DBG_DMAVERBOSE)) | |
1424 | b43legacydbg(dev->wl, "Stopped TX ring %d\n", | |
1425 | ring->index); | |
1426 | } | |
1427 | out_unlock: | |
1428 | spin_unlock_irqrestore(&ring->lock, flags); | |
1429 | ||
1430 | return err; | |
1431 | } | |
1432 | ||
1433 | void b43legacy_dma_handle_txstatus(struct b43legacy_wldev *dev, | |
1434 | const struct b43legacy_txstatus *status) | |
1435 | { | |
1436 | const struct b43legacy_dma_ops *ops; | |
1437 | struct b43legacy_dmaring *ring; | |
1438 | struct b43legacy_dmadesc_generic *desc; | |
1439 | struct b43legacy_dmadesc_meta *meta; | |
e6a9854b | 1440 | int retry_limit; |
75388acd LF |
1441 | int slot; |
1442 | ||
1443 | ring = parse_cookie(dev, status->cookie, &slot); | |
1444 | if (unlikely(!ring)) | |
1445 | return; | |
1446 | B43legacy_WARN_ON(!irqs_disabled()); | |
1447 | spin_lock(&ring->lock); | |
1448 | ||
1449 | B43legacy_WARN_ON(!ring->tx); | |
1450 | ops = ring->ops; | |
1451 | while (1) { | |
1452 | B43legacy_WARN_ON(!(slot >= 0 && slot < ring->nr_slots)); | |
1453 | desc = ops->idx2desc(ring, slot, &meta); | |
1454 | ||
1455 | if (meta->skb) | |
1456 | unmap_descbuffer(ring, meta->dmaaddr, | |
1457 | meta->skb->len, 1); | |
1458 | else | |
1459 | unmap_descbuffer(ring, meta->dmaaddr, | |
1460 | sizeof(struct b43legacy_txhdr_fw3), | |
1461 | 1); | |
1462 | ||
1463 | if (meta->is_last_fragment) { | |
e039fa4a JB |
1464 | struct ieee80211_tx_info *info; |
1465 | BUG_ON(!meta->skb); | |
1466 | info = IEEE80211_SKB_CB(meta->skb); | |
e039fa4a | 1467 | |
e6a9854b JB |
1468 | /* preserve the confiured retry limit before clearing the status |
1469 | * The xmit function has overwritten the rc's value with the actual | |
1470 | * retry limit done by the hardware */ | |
1471 | retry_limit = info->status.rates[0].count; | |
1472 | ieee80211_tx_info_clear_status(info); | |
e039fa4a | 1473 | |
e6a9854b | 1474 | if (status->acked) |
e039fa4a | 1475 | info->flags |= IEEE80211_TX_STAT_ACK; |
e6a9854b JB |
1476 | |
1477 | if (status->rts_count > dev->wl->hw->conf.short_frame_max_tx_count) { | |
1478 | /* | |
1479 | * If the short retries (RTS, not data frame) have exceeded | |
1480 | * the limit, the hw will not have tried the selected rate, | |
1481 | * but will have used the fallback rate instead. | |
1482 | * Don't let the rate control count attempts for the selected | |
1483 | * rate in this case, otherwise the statistics will be off. | |
1484 | */ | |
1485 | info->status.rates[0].count = 0; | |
1486 | info->status.rates[1].count = status->frame_count; | |
75388acd | 1487 | } else { |
e6a9854b JB |
1488 | if (status->frame_count > retry_limit) { |
1489 | info->status.rates[0].count = retry_limit; | |
1490 | info->status.rates[1].count = status->frame_count - | |
1491 | retry_limit; | |
1492 | ||
1493 | } else { | |
1494 | info->status.rates[0].count = status->frame_count; | |
1495 | info->status.rates[1].idx = -1; | |
1496 | } | |
75388acd | 1497 | } |
e6a9854b JB |
1498 | |
1499 | /* Call back to inform the ieee80211 subsystem about the | |
1500 | * status of the transmission. | |
1501 | * Some fields of txstat are already filled in dma_tx(). | |
1502 | */ | |
e039fa4a | 1503 | ieee80211_tx_status_irqsafe(dev->wl->hw, meta->skb); |
75388acd LF |
1504 | /* skb is freed by ieee80211_tx_status_irqsafe() */ |
1505 | meta->skb = NULL; | |
1506 | } else { | |
1507 | /* No need to call free_descriptor_buffer here, as | |
1508 | * this is only the txhdr, which is not allocated. | |
1509 | */ | |
1510 | B43legacy_WARN_ON(meta->skb != NULL); | |
1511 | } | |
1512 | ||
1513 | /* Everything unmapped and free'd. So it's not used anymore. */ | |
1514 | ring->used_slots--; | |
1515 | ||
1516 | if (meta->is_last_fragment) | |
1517 | break; | |
1518 | slot = next_slot(ring, slot); | |
1519 | } | |
1520 | dev->stats.last_tx = jiffies; | |
1521 | if (ring->stopped) { | |
1522 | B43legacy_WARN_ON(free_slots(ring) < SLOTS_PER_PACKET); | |
1523 | ieee80211_wake_queue(dev->wl->hw, txring_to_priority(ring)); | |
1524 | ring->stopped = 0; | |
1525 | if (b43legacy_debug(dev, B43legacy_DBG_DMAVERBOSE)) | |
1526 | b43legacydbg(dev->wl, "Woke up TX ring %d\n", | |
1527 | ring->index); | |
1528 | } | |
1529 | ||
1530 | spin_unlock(&ring->lock); | |
1531 | } | |
1532 | ||
75388acd LF |
1533 | static void dma_rx(struct b43legacy_dmaring *ring, |
1534 | int *slot) | |
1535 | { | |
1536 | const struct b43legacy_dma_ops *ops = ring->ops; | |
1537 | struct b43legacy_dmadesc_generic *desc; | |
1538 | struct b43legacy_dmadesc_meta *meta; | |
1539 | struct b43legacy_rxhdr_fw3 *rxhdr; | |
1540 | struct sk_buff *skb; | |
1541 | u16 len; | |
1542 | int err; | |
1543 | dma_addr_t dmaaddr; | |
1544 | ||
1545 | desc = ops->idx2desc(ring, *slot, &meta); | |
1546 | ||
1547 | sync_descbuffer_for_cpu(ring, meta->dmaaddr, ring->rx_buffersize); | |
1548 | skb = meta->skb; | |
1549 | ||
1550 | if (ring->index == 3) { | |
1551 | /* We received an xmit status. */ | |
1552 | struct b43legacy_hwtxstatus *hw = | |
1553 | (struct b43legacy_hwtxstatus *)skb->data; | |
1554 | int i = 0; | |
1555 | ||
1556 | while (hw->cookie == 0) { | |
1557 | if (i > 100) | |
1558 | break; | |
1559 | i++; | |
1560 | udelay(2); | |
1561 | barrier(); | |
1562 | } | |
1563 | b43legacy_handle_hwtxstatus(ring->dev, hw); | |
1564 | /* recycle the descriptor buffer. */ | |
1565 | sync_descbuffer_for_device(ring, meta->dmaaddr, | |
1566 | ring->rx_buffersize); | |
1567 | ||
1568 | return; | |
1569 | } | |
1570 | rxhdr = (struct b43legacy_rxhdr_fw3 *)skb->data; | |
1571 | len = le16_to_cpu(rxhdr->frame_len); | |
1572 | if (len == 0) { | |
1573 | int i = 0; | |
1574 | ||
1575 | do { | |
1576 | udelay(2); | |
1577 | barrier(); | |
1578 | len = le16_to_cpu(rxhdr->frame_len); | |
1579 | } while (len == 0 && i++ < 5); | |
1580 | if (unlikely(len == 0)) { | |
1581 | /* recycle the descriptor buffer. */ | |
1582 | sync_descbuffer_for_device(ring, meta->dmaaddr, | |
1583 | ring->rx_buffersize); | |
1584 | goto drop; | |
1585 | } | |
1586 | } | |
1587 | if (unlikely(len > ring->rx_buffersize)) { | |
1588 | /* The data did not fit into one descriptor buffer | |
1589 | * and is split over multiple buffers. | |
1590 | * This should never happen, as we try to allocate buffers | |
1591 | * big enough. So simply ignore this packet. | |
1592 | */ | |
1593 | int cnt = 0; | |
1594 | s32 tmp = len; | |
1595 | ||
1596 | while (1) { | |
1597 | desc = ops->idx2desc(ring, *slot, &meta); | |
1598 | /* recycle the descriptor buffer. */ | |
1599 | sync_descbuffer_for_device(ring, meta->dmaaddr, | |
1600 | ring->rx_buffersize); | |
1601 | *slot = next_slot(ring, *slot); | |
1602 | cnt++; | |
1603 | tmp -= ring->rx_buffersize; | |
1604 | if (tmp <= 0) | |
1605 | break; | |
1606 | } | |
1607 | b43legacyerr(ring->dev->wl, "DMA RX buffer too small " | |
1608 | "(len: %u, buffer: %u, nr-dropped: %d)\n", | |
1609 | len, ring->rx_buffersize, cnt); | |
1610 | goto drop; | |
1611 | } | |
1612 | ||
1613 | dmaaddr = meta->dmaaddr; | |
1614 | err = setup_rx_descbuffer(ring, desc, meta, GFP_ATOMIC); | |
1615 | if (unlikely(err)) { | |
1616 | b43legacydbg(ring->dev->wl, "DMA RX: setup_rx_descbuffer()" | |
1617 | " failed\n"); | |
1618 | sync_descbuffer_for_device(ring, dmaaddr, | |
1619 | ring->rx_buffersize); | |
1620 | goto drop; | |
1621 | } | |
1622 | ||
1623 | unmap_descbuffer(ring, dmaaddr, ring->rx_buffersize, 0); | |
1624 | skb_put(skb, len + ring->frameoffset); | |
1625 | skb_pull(skb, ring->frameoffset); | |
1626 | ||
1627 | b43legacy_rx(ring->dev, skb, rxhdr); | |
1628 | drop: | |
1629 | return; | |
1630 | } | |
1631 | ||
1632 | void b43legacy_dma_rx(struct b43legacy_dmaring *ring) | |
1633 | { | |
1634 | const struct b43legacy_dma_ops *ops = ring->ops; | |
1635 | int slot; | |
1636 | int current_slot; | |
1637 | int used_slots = 0; | |
1638 | ||
1639 | B43legacy_WARN_ON(ring->tx); | |
1640 | current_slot = ops->get_current_rxslot(ring); | |
1641 | B43legacy_WARN_ON(!(current_slot >= 0 && current_slot < | |
1642 | ring->nr_slots)); | |
1643 | ||
1644 | slot = ring->current_slot; | |
1645 | for (; slot != current_slot; slot = next_slot(ring, slot)) { | |
1646 | dma_rx(ring, &slot); | |
1647 | update_max_used_slots(ring, ++used_slots); | |
1648 | } | |
1649 | ops->set_current_rxslot(ring, slot); | |
1650 | ring->current_slot = slot; | |
1651 | } | |
1652 | ||
1653 | static void b43legacy_dma_tx_suspend_ring(struct b43legacy_dmaring *ring) | |
1654 | { | |
1655 | unsigned long flags; | |
1656 | ||
1657 | spin_lock_irqsave(&ring->lock, flags); | |
1658 | B43legacy_WARN_ON(!ring->tx); | |
1659 | ring->ops->tx_suspend(ring); | |
1660 | spin_unlock_irqrestore(&ring->lock, flags); | |
1661 | } | |
1662 | ||
1663 | static void b43legacy_dma_tx_resume_ring(struct b43legacy_dmaring *ring) | |
1664 | { | |
1665 | unsigned long flags; | |
1666 | ||
1667 | spin_lock_irqsave(&ring->lock, flags); | |
1668 | B43legacy_WARN_ON(!ring->tx); | |
1669 | ring->ops->tx_resume(ring); | |
1670 | spin_unlock_irqrestore(&ring->lock, flags); | |
1671 | } | |
1672 | ||
1673 | void b43legacy_dma_tx_suspend(struct b43legacy_wldev *dev) | |
1674 | { | |
1675 | b43legacy_power_saving_ctl_bits(dev, -1, 1); | |
1676 | b43legacy_dma_tx_suspend_ring(dev->dma.tx_ring0); | |
1677 | b43legacy_dma_tx_suspend_ring(dev->dma.tx_ring1); | |
1678 | b43legacy_dma_tx_suspend_ring(dev->dma.tx_ring2); | |
1679 | b43legacy_dma_tx_suspend_ring(dev->dma.tx_ring3); | |
1680 | b43legacy_dma_tx_suspend_ring(dev->dma.tx_ring4); | |
1681 | b43legacy_dma_tx_suspend_ring(dev->dma.tx_ring5); | |
1682 | } | |
1683 | ||
1684 | void b43legacy_dma_tx_resume(struct b43legacy_wldev *dev) | |
1685 | { | |
1686 | b43legacy_dma_tx_resume_ring(dev->dma.tx_ring5); | |
1687 | b43legacy_dma_tx_resume_ring(dev->dma.tx_ring4); | |
1688 | b43legacy_dma_tx_resume_ring(dev->dma.tx_ring3); | |
1689 | b43legacy_dma_tx_resume_ring(dev->dma.tx_ring2); | |
1690 | b43legacy_dma_tx_resume_ring(dev->dma.tx_ring1); | |
1691 | b43legacy_dma_tx_resume_ring(dev->dma.tx_ring0); | |
1692 | b43legacy_power_saving_ctl_bits(dev, -1, -1); | |
1693 | } |