Commit | Line | Data |
---|---|---|
e4d6b795 MB |
1 | /* |
2 | ||
3 | Broadcom B43 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 "b43.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> | |
280d0e16 | 40 | #include <linux/etherdevice.h> |
57df40d2 | 41 | #include <asm/div64.h> |
280d0e16 | 42 | |
e4d6b795 | 43 | |
bdceeb2d MB |
44 | /* Required number of TX DMA slots per TX frame. |
45 | * This currently is 2, because we put the header and the ieee80211 frame | |
46 | * into separate slots. */ | |
47 | #define TX_SLOTS_PER_FRAME 2 | |
48 | ||
49 | ||
e4d6b795 MB |
50 | /* 32bit DMA ops. */ |
51 | static | |
52 | struct b43_dmadesc_generic *op32_idx2desc(struct b43_dmaring *ring, | |
53 | int slot, | |
54 | struct b43_dmadesc_meta **meta) | |
55 | { | |
56 | struct b43_dmadesc32 *desc; | |
57 | ||
58 | *meta = &(ring->meta[slot]); | |
59 | desc = ring->descbase; | |
60 | desc = &(desc[slot]); | |
61 | ||
62 | return (struct b43_dmadesc_generic *)desc; | |
63 | } | |
64 | ||
65 | static void op32_fill_descriptor(struct b43_dmaring *ring, | |
66 | struct b43_dmadesc_generic *desc, | |
67 | dma_addr_t dmaaddr, u16 bufsize, | |
68 | int start, int end, int irq) | |
69 | { | |
70 | struct b43_dmadesc32 *descbase = ring->descbase; | |
71 | int slot; | |
72 | u32 ctl; | |
73 | u32 addr; | |
74 | u32 addrext; | |
75 | ||
76 | slot = (int)(&(desc->dma32) - descbase); | |
77 | B43_WARN_ON(!(slot >= 0 && slot < ring->nr_slots)); | |
78 | ||
79 | addr = (u32) (dmaaddr & ~SSB_DMA_TRANSLATION_MASK); | |
80 | addrext = (u32) (dmaaddr & SSB_DMA_TRANSLATION_MASK) | |
81 | >> SSB_DMA_TRANSLATION_SHIFT; | |
82 | addr |= ssb_dma_translation(ring->dev->dev); | |
8eccb53f | 83 | ctl = bufsize & B43_DMA32_DCTL_BYTECNT; |
e4d6b795 MB |
84 | if (slot == ring->nr_slots - 1) |
85 | ctl |= B43_DMA32_DCTL_DTABLEEND; | |
86 | if (start) | |
87 | ctl |= B43_DMA32_DCTL_FRAMESTART; | |
88 | if (end) | |
89 | ctl |= B43_DMA32_DCTL_FRAMEEND; | |
90 | if (irq) | |
91 | ctl |= B43_DMA32_DCTL_IRQ; | |
92 | ctl |= (addrext << B43_DMA32_DCTL_ADDREXT_SHIFT) | |
93 | & B43_DMA32_DCTL_ADDREXT_MASK; | |
94 | ||
95 | desc->dma32.control = cpu_to_le32(ctl); | |
96 | desc->dma32.address = cpu_to_le32(addr); | |
97 | } | |
98 | ||
99 | static void op32_poke_tx(struct b43_dmaring *ring, int slot) | |
100 | { | |
101 | b43_dma_write(ring, B43_DMA32_TXINDEX, | |
102 | (u32) (slot * sizeof(struct b43_dmadesc32))); | |
103 | } | |
104 | ||
105 | static void op32_tx_suspend(struct b43_dmaring *ring) | |
106 | { | |
107 | b43_dma_write(ring, B43_DMA32_TXCTL, b43_dma_read(ring, B43_DMA32_TXCTL) | |
108 | | B43_DMA32_TXSUSPEND); | |
109 | } | |
110 | ||
111 | static void op32_tx_resume(struct b43_dmaring *ring) | |
112 | { | |
113 | b43_dma_write(ring, B43_DMA32_TXCTL, b43_dma_read(ring, B43_DMA32_TXCTL) | |
114 | & ~B43_DMA32_TXSUSPEND); | |
115 | } | |
116 | ||
117 | static int op32_get_current_rxslot(struct b43_dmaring *ring) | |
118 | { | |
119 | u32 val; | |
120 | ||
121 | val = b43_dma_read(ring, B43_DMA32_RXSTATUS); | |
122 | val &= B43_DMA32_RXDPTR; | |
123 | ||
124 | return (val / sizeof(struct b43_dmadesc32)); | |
125 | } | |
126 | ||
127 | static void op32_set_current_rxslot(struct b43_dmaring *ring, int slot) | |
128 | { | |
129 | b43_dma_write(ring, B43_DMA32_RXINDEX, | |
130 | (u32) (slot * sizeof(struct b43_dmadesc32))); | |
131 | } | |
132 | ||
133 | static const struct b43_dma_ops dma32_ops = { | |
134 | .idx2desc = op32_idx2desc, | |
135 | .fill_descriptor = op32_fill_descriptor, | |
136 | .poke_tx = op32_poke_tx, | |
137 | .tx_suspend = op32_tx_suspend, | |
138 | .tx_resume = op32_tx_resume, | |
139 | .get_current_rxslot = op32_get_current_rxslot, | |
140 | .set_current_rxslot = op32_set_current_rxslot, | |
141 | }; | |
142 | ||
143 | /* 64bit DMA ops. */ | |
144 | static | |
145 | struct b43_dmadesc_generic *op64_idx2desc(struct b43_dmaring *ring, | |
146 | int slot, | |
147 | struct b43_dmadesc_meta **meta) | |
148 | { | |
149 | struct b43_dmadesc64 *desc; | |
150 | ||
151 | *meta = &(ring->meta[slot]); | |
152 | desc = ring->descbase; | |
153 | desc = &(desc[slot]); | |
154 | ||
155 | return (struct b43_dmadesc_generic *)desc; | |
156 | } | |
157 | ||
158 | static void op64_fill_descriptor(struct b43_dmaring *ring, | |
159 | struct b43_dmadesc_generic *desc, | |
160 | dma_addr_t dmaaddr, u16 bufsize, | |
161 | int start, int end, int irq) | |
162 | { | |
163 | struct b43_dmadesc64 *descbase = ring->descbase; | |
164 | int slot; | |
165 | u32 ctl0 = 0, ctl1 = 0; | |
166 | u32 addrlo, addrhi; | |
167 | u32 addrext; | |
168 | ||
169 | slot = (int)(&(desc->dma64) - descbase); | |
170 | B43_WARN_ON(!(slot >= 0 && slot < ring->nr_slots)); | |
171 | ||
172 | addrlo = (u32) (dmaaddr & 0xFFFFFFFF); | |
173 | addrhi = (((u64) dmaaddr >> 32) & ~SSB_DMA_TRANSLATION_MASK); | |
174 | addrext = (((u64) dmaaddr >> 32) & SSB_DMA_TRANSLATION_MASK) | |
175 | >> SSB_DMA_TRANSLATION_SHIFT; | |
013978b6 | 176 | addrhi |= (ssb_dma_translation(ring->dev->dev) << 1); |
e4d6b795 MB |
177 | if (slot == ring->nr_slots - 1) |
178 | ctl0 |= B43_DMA64_DCTL0_DTABLEEND; | |
179 | if (start) | |
180 | ctl0 |= B43_DMA64_DCTL0_FRAMESTART; | |
181 | if (end) | |
182 | ctl0 |= B43_DMA64_DCTL0_FRAMEEND; | |
183 | if (irq) | |
184 | ctl0 |= B43_DMA64_DCTL0_IRQ; | |
8eccb53f | 185 | ctl1 |= bufsize & B43_DMA64_DCTL1_BYTECNT; |
e4d6b795 MB |
186 | ctl1 |= (addrext << B43_DMA64_DCTL1_ADDREXT_SHIFT) |
187 | & B43_DMA64_DCTL1_ADDREXT_MASK; | |
188 | ||
189 | desc->dma64.control0 = cpu_to_le32(ctl0); | |
190 | desc->dma64.control1 = cpu_to_le32(ctl1); | |
191 | desc->dma64.address_low = cpu_to_le32(addrlo); | |
192 | desc->dma64.address_high = cpu_to_le32(addrhi); | |
193 | } | |
194 | ||
195 | static void op64_poke_tx(struct b43_dmaring *ring, int slot) | |
196 | { | |
197 | b43_dma_write(ring, B43_DMA64_TXINDEX, | |
198 | (u32) (slot * sizeof(struct b43_dmadesc64))); | |
199 | } | |
200 | ||
201 | static void op64_tx_suspend(struct b43_dmaring *ring) | |
202 | { | |
203 | b43_dma_write(ring, B43_DMA64_TXCTL, b43_dma_read(ring, B43_DMA64_TXCTL) | |
204 | | B43_DMA64_TXSUSPEND); | |
205 | } | |
206 | ||
207 | static void op64_tx_resume(struct b43_dmaring *ring) | |
208 | { | |
209 | b43_dma_write(ring, B43_DMA64_TXCTL, b43_dma_read(ring, B43_DMA64_TXCTL) | |
210 | & ~B43_DMA64_TXSUSPEND); | |
211 | } | |
212 | ||
213 | static int op64_get_current_rxslot(struct b43_dmaring *ring) | |
214 | { | |
215 | u32 val; | |
216 | ||
217 | val = b43_dma_read(ring, B43_DMA64_RXSTATUS); | |
218 | val &= B43_DMA64_RXSTATDPTR; | |
219 | ||
220 | return (val / sizeof(struct b43_dmadesc64)); | |
221 | } | |
222 | ||
223 | static void op64_set_current_rxslot(struct b43_dmaring *ring, int slot) | |
224 | { | |
225 | b43_dma_write(ring, B43_DMA64_RXINDEX, | |
226 | (u32) (slot * sizeof(struct b43_dmadesc64))); | |
227 | } | |
228 | ||
229 | static const struct b43_dma_ops dma64_ops = { | |
230 | .idx2desc = op64_idx2desc, | |
231 | .fill_descriptor = op64_fill_descriptor, | |
232 | .poke_tx = op64_poke_tx, | |
233 | .tx_suspend = op64_tx_suspend, | |
234 | .tx_resume = op64_tx_resume, | |
235 | .get_current_rxslot = op64_get_current_rxslot, | |
236 | .set_current_rxslot = op64_set_current_rxslot, | |
237 | }; | |
238 | ||
239 | static inline int free_slots(struct b43_dmaring *ring) | |
240 | { | |
241 | return (ring->nr_slots - ring->used_slots); | |
242 | } | |
243 | ||
244 | static inline int next_slot(struct b43_dmaring *ring, int slot) | |
245 | { | |
246 | B43_WARN_ON(!(slot >= -1 && slot <= ring->nr_slots - 1)); | |
247 | if (slot == ring->nr_slots - 1) | |
248 | return 0; | |
249 | return slot + 1; | |
250 | } | |
251 | ||
252 | static inline int prev_slot(struct b43_dmaring *ring, int slot) | |
253 | { | |
254 | B43_WARN_ON(!(slot >= 0 && slot <= ring->nr_slots - 1)); | |
255 | if (slot == 0) | |
256 | return ring->nr_slots - 1; | |
257 | return slot - 1; | |
258 | } | |
259 | ||
260 | #ifdef CONFIG_B43_DEBUG | |
261 | static void update_max_used_slots(struct b43_dmaring *ring, | |
262 | int current_used_slots) | |
263 | { | |
264 | if (current_used_slots <= ring->max_used_slots) | |
265 | return; | |
266 | ring->max_used_slots = current_used_slots; | |
267 | if (b43_debug(ring->dev, B43_DBG_DMAVERBOSE)) { | |
268 | b43dbg(ring->dev->wl, | |
269 | "max_used_slots increased to %d on %s ring %d\n", | |
270 | ring->max_used_slots, | |
271 | ring->tx ? "TX" : "RX", ring->index); | |
272 | } | |
273 | } | |
274 | #else | |
275 | static inline | |
276 | void update_max_used_slots(struct b43_dmaring *ring, int current_used_slots) | |
277 | { | |
278 | } | |
279 | #endif /* DEBUG */ | |
280 | ||
281 | /* Request a slot for usage. */ | |
282 | static inline int request_slot(struct b43_dmaring *ring) | |
283 | { | |
284 | int slot; | |
285 | ||
286 | B43_WARN_ON(!ring->tx); | |
287 | B43_WARN_ON(ring->stopped); | |
288 | B43_WARN_ON(free_slots(ring) == 0); | |
289 | ||
290 | slot = next_slot(ring, ring->current_slot); | |
291 | ring->current_slot = slot; | |
292 | ring->used_slots++; | |
293 | ||
294 | update_max_used_slots(ring, ring->used_slots); | |
295 | ||
296 | return slot; | |
297 | } | |
298 | ||
b79caa68 | 299 | static u16 b43_dmacontroller_base(enum b43_dmatype type, int controller_idx) |
e4d6b795 MB |
300 | { |
301 | static const u16 map64[] = { | |
302 | B43_MMIO_DMA64_BASE0, | |
303 | B43_MMIO_DMA64_BASE1, | |
304 | B43_MMIO_DMA64_BASE2, | |
305 | B43_MMIO_DMA64_BASE3, | |
306 | B43_MMIO_DMA64_BASE4, | |
307 | B43_MMIO_DMA64_BASE5, | |
308 | }; | |
309 | static const u16 map32[] = { | |
310 | B43_MMIO_DMA32_BASE0, | |
311 | B43_MMIO_DMA32_BASE1, | |
312 | B43_MMIO_DMA32_BASE2, | |
313 | B43_MMIO_DMA32_BASE3, | |
314 | B43_MMIO_DMA32_BASE4, | |
315 | B43_MMIO_DMA32_BASE5, | |
316 | }; | |
317 | ||
b79caa68 | 318 | if (type == B43_DMA_64BIT) { |
e4d6b795 MB |
319 | B43_WARN_ON(!(controller_idx >= 0 && |
320 | controller_idx < ARRAY_SIZE(map64))); | |
321 | return map64[controller_idx]; | |
322 | } | |
323 | B43_WARN_ON(!(controller_idx >= 0 && | |
324 | controller_idx < ARRAY_SIZE(map32))); | |
325 | return map32[controller_idx]; | |
326 | } | |
327 | ||
328 | static inline | |
329 | dma_addr_t map_descbuffer(struct b43_dmaring *ring, | |
330 | unsigned char *buf, size_t len, int tx) | |
331 | { | |
332 | dma_addr_t dmaaddr; | |
333 | ||
334 | if (tx) { | |
f225763a MB |
335 | dmaaddr = ssb_dma_map_single(ring->dev->dev, |
336 | buf, len, DMA_TO_DEVICE); | |
e4d6b795 | 337 | } else { |
f225763a MB |
338 | dmaaddr = ssb_dma_map_single(ring->dev->dev, |
339 | buf, len, DMA_FROM_DEVICE); | |
e4d6b795 MB |
340 | } |
341 | ||
342 | return dmaaddr; | |
343 | } | |
344 | ||
345 | static inline | |
346 | void unmap_descbuffer(struct b43_dmaring *ring, | |
347 | dma_addr_t addr, size_t len, int tx) | |
348 | { | |
349 | if (tx) { | |
f225763a MB |
350 | ssb_dma_unmap_single(ring->dev->dev, |
351 | addr, len, DMA_TO_DEVICE); | |
e4d6b795 | 352 | } else { |
f225763a MB |
353 | ssb_dma_unmap_single(ring->dev->dev, |
354 | addr, len, DMA_FROM_DEVICE); | |
e4d6b795 MB |
355 | } |
356 | } | |
357 | ||
358 | static inline | |
359 | void sync_descbuffer_for_cpu(struct b43_dmaring *ring, | |
360 | dma_addr_t addr, size_t len) | |
361 | { | |
362 | B43_WARN_ON(ring->tx); | |
f225763a MB |
363 | ssb_dma_sync_single_for_cpu(ring->dev->dev, |
364 | addr, len, DMA_FROM_DEVICE); | |
e4d6b795 MB |
365 | } |
366 | ||
367 | static inline | |
368 | void sync_descbuffer_for_device(struct b43_dmaring *ring, | |
369 | dma_addr_t addr, size_t len) | |
370 | { | |
371 | B43_WARN_ON(ring->tx); | |
f225763a MB |
372 | ssb_dma_sync_single_for_device(ring->dev->dev, |
373 | addr, len, DMA_FROM_DEVICE); | |
e4d6b795 MB |
374 | } |
375 | ||
376 | static inline | |
377 | void free_descriptor_buffer(struct b43_dmaring *ring, | |
378 | struct b43_dmadesc_meta *meta) | |
379 | { | |
380 | if (meta->skb) { | |
381 | dev_kfree_skb_any(meta->skb); | |
382 | meta->skb = NULL; | |
383 | } | |
384 | } | |
385 | ||
386 | static int alloc_ringmemory(struct b43_dmaring *ring) | |
387 | { | |
55afc80b JL |
388 | gfp_t flags = GFP_KERNEL; |
389 | ||
390 | /* The specs call for 4K buffers for 30- and 32-bit DMA with 4K | |
391 | * alignment and 8K buffers for 64-bit DMA with 8K alignment. Testing | |
392 | * has shown that 4K is sufficient for the latter as long as the buffer | |
393 | * does not cross an 8K boundary. | |
394 | * | |
395 | * For unknown reasons - possibly a hardware error - the BCM4311 rev | |
396 | * 02, which uses 64-bit DMA, needs the ring buffer in very low memory, | |
397 | * which accounts for the GFP_DMA flag below. | |
398 | * | |
399 | * The flags here must match the flags in free_ringmemory below! | |
013978b6 | 400 | */ |
b79caa68 | 401 | if (ring->type == B43_DMA_64BIT) |
55afc80b JL |
402 | flags |= GFP_DMA; |
403 | ring->descbase = ssb_dma_alloc_consistent(ring->dev->dev, | |
404 | B43_DMA_RINGMEMSIZE, | |
405 | &(ring->dmabase), flags); | |
406 | if (!ring->descbase) { | |
407 | b43err(ring->dev->wl, "DMA ringmemory allocation failed\n"); | |
9bd568a5 | 408 | return -ENOMEM; |
e4d6b795 | 409 | } |
55afc80b | 410 | memset(ring->descbase, 0, B43_DMA_RINGMEMSIZE); |
e4d6b795 MB |
411 | |
412 | return 0; | |
413 | } | |
414 | ||
415 | static void free_ringmemory(struct b43_dmaring *ring) | |
416 | { | |
55afc80b JL |
417 | gfp_t flags = GFP_KERNEL; |
418 | ||
419 | if (ring->type == B43_DMA_64BIT) | |
420 | flags |= GFP_DMA; | |
421 | ||
422 | ssb_dma_free_consistent(ring->dev->dev, B43_DMA_RINGMEMSIZE, | |
423 | ring->descbase, ring->dmabase, flags); | |
e4d6b795 MB |
424 | } |
425 | ||
426 | /* Reset the RX DMA channel */ | |
b79caa68 MB |
427 | static int b43_dmacontroller_rx_reset(struct b43_wldev *dev, u16 mmio_base, |
428 | enum b43_dmatype type) | |
e4d6b795 MB |
429 | { |
430 | int i; | |
431 | u32 value; | |
432 | u16 offset; | |
433 | ||
434 | might_sleep(); | |
435 | ||
b79caa68 | 436 | offset = (type == B43_DMA_64BIT) ? B43_DMA64_RXCTL : B43_DMA32_RXCTL; |
e4d6b795 MB |
437 | b43_write32(dev, mmio_base + offset, 0); |
438 | for (i = 0; i < 10; i++) { | |
b79caa68 MB |
439 | offset = (type == B43_DMA_64BIT) ? B43_DMA64_RXSTATUS : |
440 | B43_DMA32_RXSTATUS; | |
e4d6b795 | 441 | value = b43_read32(dev, mmio_base + offset); |
b79caa68 | 442 | if (type == B43_DMA_64BIT) { |
e4d6b795 MB |
443 | value &= B43_DMA64_RXSTAT; |
444 | if (value == B43_DMA64_RXSTAT_DISABLED) { | |
445 | i = -1; | |
446 | break; | |
447 | } | |
448 | } else { | |
449 | value &= B43_DMA32_RXSTATE; | |
450 | if (value == B43_DMA32_RXSTAT_DISABLED) { | |
451 | i = -1; | |
452 | break; | |
453 | } | |
454 | } | |
455 | msleep(1); | |
456 | } | |
457 | if (i != -1) { | |
458 | b43err(dev->wl, "DMA RX reset timed out\n"); | |
459 | return -ENODEV; | |
460 | } | |
461 | ||
462 | return 0; | |
463 | } | |
464 | ||
013978b6 | 465 | /* Reset the TX DMA channel */ |
b79caa68 MB |
466 | static int b43_dmacontroller_tx_reset(struct b43_wldev *dev, u16 mmio_base, |
467 | enum b43_dmatype type) | |
e4d6b795 MB |
468 | { |
469 | int i; | |
470 | u32 value; | |
471 | u16 offset; | |
472 | ||
473 | might_sleep(); | |
474 | ||
475 | for (i = 0; i < 10; i++) { | |
b79caa68 MB |
476 | offset = (type == B43_DMA_64BIT) ? B43_DMA64_TXSTATUS : |
477 | B43_DMA32_TXSTATUS; | |
e4d6b795 | 478 | value = b43_read32(dev, mmio_base + offset); |
b79caa68 | 479 | if (type == B43_DMA_64BIT) { |
e4d6b795 MB |
480 | value &= B43_DMA64_TXSTAT; |
481 | if (value == B43_DMA64_TXSTAT_DISABLED || | |
482 | value == B43_DMA64_TXSTAT_IDLEWAIT || | |
483 | value == B43_DMA64_TXSTAT_STOPPED) | |
484 | break; | |
485 | } else { | |
486 | value &= B43_DMA32_TXSTATE; | |
487 | if (value == B43_DMA32_TXSTAT_DISABLED || | |
488 | value == B43_DMA32_TXSTAT_IDLEWAIT || | |
489 | value == B43_DMA32_TXSTAT_STOPPED) | |
490 | break; | |
491 | } | |
492 | msleep(1); | |
493 | } | |
b79caa68 | 494 | offset = (type == B43_DMA_64BIT) ? B43_DMA64_TXCTL : B43_DMA32_TXCTL; |
e4d6b795 MB |
495 | b43_write32(dev, mmio_base + offset, 0); |
496 | for (i = 0; i < 10; i++) { | |
b79caa68 MB |
497 | offset = (type == B43_DMA_64BIT) ? B43_DMA64_TXSTATUS : |
498 | B43_DMA32_TXSTATUS; | |
e4d6b795 | 499 | value = b43_read32(dev, mmio_base + offset); |
b79caa68 | 500 | if (type == B43_DMA_64BIT) { |
e4d6b795 MB |
501 | value &= B43_DMA64_TXSTAT; |
502 | if (value == B43_DMA64_TXSTAT_DISABLED) { | |
503 | i = -1; | |
504 | break; | |
505 | } | |
506 | } else { | |
507 | value &= B43_DMA32_TXSTATE; | |
508 | if (value == B43_DMA32_TXSTAT_DISABLED) { | |
509 | i = -1; | |
510 | break; | |
511 | } | |
512 | } | |
513 | msleep(1); | |
514 | } | |
515 | if (i != -1) { | |
516 | b43err(dev->wl, "DMA TX reset timed out\n"); | |
517 | return -ENODEV; | |
518 | } | |
519 | /* ensure the reset is completed. */ | |
520 | msleep(1); | |
521 | ||
522 | return 0; | |
523 | } | |
524 | ||
b79caa68 MB |
525 | /* Check if a DMA mapping address is invalid. */ |
526 | static bool b43_dma_mapping_error(struct b43_dmaring *ring, | |
527 | dma_addr_t addr, | |
ffa9256a | 528 | size_t buffersize, bool dma_to_device) |
b79caa68 | 529 | { |
f225763a | 530 | if (unlikely(ssb_dma_mapping_error(ring->dev->dev, addr))) |
b79caa68 MB |
531 | return 1; |
532 | ||
55afc80b JL |
533 | switch (ring->type) { |
534 | case B43_DMA_30BIT: | |
535 | if ((u64)addr + buffersize > (1ULL << 30)) | |
536 | goto address_error; | |
537 | break; | |
538 | case B43_DMA_32BIT: | |
539 | if ((u64)addr + buffersize > (1ULL << 32)) | |
540 | goto address_error; | |
541 | break; | |
542 | case B43_DMA_64BIT: | |
543 | /* Currently we can't have addresses beyond | |
544 | * 64bit in the kernel. */ | |
545 | break; | |
b79caa68 MB |
546 | } |
547 | ||
548 | /* The address is OK. */ | |
549 | return 0; | |
55afc80b JL |
550 | |
551 | address_error: | |
552 | /* We can't support this address. Unmap it again. */ | |
553 | unmap_descbuffer(ring, addr, buffersize, dma_to_device); | |
554 | ||
555 | return 1; | |
b79caa68 MB |
556 | } |
557 | ||
ec9a1d8c MB |
558 | static bool b43_rx_buffer_is_poisoned(struct b43_dmaring *ring, struct sk_buff *skb) |
559 | { | |
560 | unsigned char *f = skb->data + ring->frameoffset; | |
561 | ||
562 | return ((f[0] & f[1] & f[2] & f[3] & f[4] & f[5] & f[6] & f[7]) == 0xFF); | |
563 | } | |
564 | ||
565 | static void b43_poison_rx_buffer(struct b43_dmaring *ring, struct sk_buff *skb) | |
566 | { | |
567 | struct b43_rxhdr_fw4 *rxhdr; | |
568 | unsigned char *frame; | |
569 | ||
570 | /* This poisons the RX buffer to detect DMA failures. */ | |
571 | ||
572 | rxhdr = (struct b43_rxhdr_fw4 *)(skb->data); | |
573 | rxhdr->frame_len = 0; | |
574 | ||
575 | B43_WARN_ON(ring->rx_buffersize < ring->frameoffset + sizeof(struct b43_plcp_hdr6) + 2); | |
576 | frame = skb->data + ring->frameoffset; | |
577 | memset(frame, 0xFF, sizeof(struct b43_plcp_hdr6) + 2 /* padding */); | |
578 | } | |
579 | ||
e4d6b795 MB |
580 | static int setup_rx_descbuffer(struct b43_dmaring *ring, |
581 | struct b43_dmadesc_generic *desc, | |
582 | struct b43_dmadesc_meta *meta, gfp_t gfp_flags) | |
583 | { | |
e4d6b795 MB |
584 | dma_addr_t dmaaddr; |
585 | struct sk_buff *skb; | |
586 | ||
587 | B43_WARN_ON(ring->tx); | |
588 | ||
589 | skb = __dev_alloc_skb(ring->rx_buffersize, gfp_flags); | |
590 | if (unlikely(!skb)) | |
591 | return -ENOMEM; | |
ec9a1d8c | 592 | b43_poison_rx_buffer(ring, skb); |
e4d6b795 | 593 | dmaaddr = map_descbuffer(ring, skb->data, ring->rx_buffersize, 0); |
ffa9256a | 594 | if (b43_dma_mapping_error(ring, dmaaddr, ring->rx_buffersize, 0)) { |
e4d6b795 MB |
595 | /* ugh. try to realloc in zone_dma */ |
596 | gfp_flags |= GFP_DMA; | |
597 | ||
598 | dev_kfree_skb_any(skb); | |
599 | ||
600 | skb = __dev_alloc_skb(ring->rx_buffersize, gfp_flags); | |
601 | if (unlikely(!skb)) | |
602 | return -ENOMEM; | |
ec9a1d8c | 603 | b43_poison_rx_buffer(ring, skb); |
e4d6b795 MB |
604 | dmaaddr = map_descbuffer(ring, skb->data, |
605 | ring->rx_buffersize, 0); | |
bdceeb2d MB |
606 | if (b43_dma_mapping_error(ring, dmaaddr, ring->rx_buffersize, 0)) { |
607 | b43err(ring->dev->wl, "RX DMA buffer allocation failed\n"); | |
608 | dev_kfree_skb_any(skb); | |
609 | return -EIO; | |
610 | } | |
e4d6b795 MB |
611 | } |
612 | ||
613 | meta->skb = skb; | |
614 | meta->dmaaddr = dmaaddr; | |
615 | ring->ops->fill_descriptor(ring, desc, dmaaddr, | |
616 | ring->rx_buffersize, 0, 0, 0); | |
617 | ||
e4d6b795 MB |
618 | return 0; |
619 | } | |
620 | ||
621 | /* Allocate the initial descbuffers. | |
622 | * This is used for an RX ring only. | |
623 | */ | |
624 | static int alloc_initial_descbuffers(struct b43_dmaring *ring) | |
625 | { | |
626 | int i, err = -ENOMEM; | |
627 | struct b43_dmadesc_generic *desc; | |
628 | struct b43_dmadesc_meta *meta; | |
629 | ||
630 | for (i = 0; i < ring->nr_slots; i++) { | |
631 | desc = ring->ops->idx2desc(ring, i, &meta); | |
632 | ||
633 | err = setup_rx_descbuffer(ring, desc, meta, GFP_KERNEL); | |
634 | if (err) { | |
635 | b43err(ring->dev->wl, | |
636 | "Failed to allocate initial descbuffers\n"); | |
637 | goto err_unwind; | |
638 | } | |
639 | } | |
640 | mb(); | |
641 | ring->used_slots = ring->nr_slots; | |
642 | err = 0; | |
643 | out: | |
644 | return err; | |
645 | ||
646 | err_unwind: | |
647 | for (i--; i >= 0; i--) { | |
648 | desc = ring->ops->idx2desc(ring, i, &meta); | |
649 | ||
650 | unmap_descbuffer(ring, meta->dmaaddr, ring->rx_buffersize, 0); | |
651 | dev_kfree_skb(meta->skb); | |
652 | } | |
653 | goto out; | |
654 | } | |
655 | ||
656 | /* Do initial setup of the DMA controller. | |
657 | * Reset the controller, write the ring busaddress | |
658 | * and switch the "enable" bit on. | |
659 | */ | |
660 | static int dmacontroller_setup(struct b43_dmaring *ring) | |
661 | { | |
662 | int err = 0; | |
663 | u32 value; | |
664 | u32 addrext; | |
665 | u32 trans = ssb_dma_translation(ring->dev->dev); | |
666 | ||
667 | if (ring->tx) { | |
b79caa68 | 668 | if (ring->type == B43_DMA_64BIT) { |
e4d6b795 MB |
669 | u64 ringbase = (u64) (ring->dmabase); |
670 | ||
671 | addrext = ((ringbase >> 32) & SSB_DMA_TRANSLATION_MASK) | |
672 | >> SSB_DMA_TRANSLATION_SHIFT; | |
673 | value = B43_DMA64_TXENABLE; | |
674 | value |= (addrext << B43_DMA64_TXADDREXT_SHIFT) | |
675 | & B43_DMA64_TXADDREXT_MASK; | |
676 | b43_dma_write(ring, B43_DMA64_TXCTL, value); | |
677 | b43_dma_write(ring, B43_DMA64_TXRINGLO, | |
678 | (ringbase & 0xFFFFFFFF)); | |
679 | b43_dma_write(ring, B43_DMA64_TXRINGHI, | |
680 | ((ringbase >> 32) & | |
681 | ~SSB_DMA_TRANSLATION_MASK) | |
013978b6 | 682 | | (trans << 1)); |
e4d6b795 MB |
683 | } else { |
684 | u32 ringbase = (u32) (ring->dmabase); | |
685 | ||
686 | addrext = (ringbase & SSB_DMA_TRANSLATION_MASK) | |
687 | >> SSB_DMA_TRANSLATION_SHIFT; | |
688 | value = B43_DMA32_TXENABLE; | |
689 | value |= (addrext << B43_DMA32_TXADDREXT_SHIFT) | |
690 | & B43_DMA32_TXADDREXT_MASK; | |
691 | b43_dma_write(ring, B43_DMA32_TXCTL, value); | |
692 | b43_dma_write(ring, B43_DMA32_TXRING, | |
693 | (ringbase & ~SSB_DMA_TRANSLATION_MASK) | |
694 | | trans); | |
695 | } | |
696 | } else { | |
697 | err = alloc_initial_descbuffers(ring); | |
698 | if (err) | |
699 | goto out; | |
b79caa68 | 700 | if (ring->type == B43_DMA_64BIT) { |
e4d6b795 MB |
701 | u64 ringbase = (u64) (ring->dmabase); |
702 | ||
703 | addrext = ((ringbase >> 32) & SSB_DMA_TRANSLATION_MASK) | |
704 | >> SSB_DMA_TRANSLATION_SHIFT; | |
705 | value = (ring->frameoffset << B43_DMA64_RXFROFF_SHIFT); | |
706 | value |= B43_DMA64_RXENABLE; | |
707 | value |= (addrext << B43_DMA64_RXADDREXT_SHIFT) | |
708 | & B43_DMA64_RXADDREXT_MASK; | |
709 | b43_dma_write(ring, B43_DMA64_RXCTL, value); | |
710 | b43_dma_write(ring, B43_DMA64_RXRINGLO, | |
711 | (ringbase & 0xFFFFFFFF)); | |
712 | b43_dma_write(ring, B43_DMA64_RXRINGHI, | |
713 | ((ringbase >> 32) & | |
714 | ~SSB_DMA_TRANSLATION_MASK) | |
013978b6 LF |
715 | | (trans << 1)); |
716 | b43_dma_write(ring, B43_DMA64_RXINDEX, ring->nr_slots * | |
717 | sizeof(struct b43_dmadesc64)); | |
e4d6b795 MB |
718 | } else { |
719 | u32 ringbase = (u32) (ring->dmabase); | |
720 | ||
721 | addrext = (ringbase & SSB_DMA_TRANSLATION_MASK) | |
722 | >> SSB_DMA_TRANSLATION_SHIFT; | |
723 | value = (ring->frameoffset << B43_DMA32_RXFROFF_SHIFT); | |
724 | value |= B43_DMA32_RXENABLE; | |
725 | value |= (addrext << B43_DMA32_RXADDREXT_SHIFT) | |
726 | & B43_DMA32_RXADDREXT_MASK; | |
727 | b43_dma_write(ring, B43_DMA32_RXCTL, value); | |
728 | b43_dma_write(ring, B43_DMA32_RXRING, | |
729 | (ringbase & ~SSB_DMA_TRANSLATION_MASK) | |
730 | | trans); | |
013978b6 LF |
731 | b43_dma_write(ring, B43_DMA32_RXINDEX, ring->nr_slots * |
732 | sizeof(struct b43_dmadesc32)); | |
e4d6b795 MB |
733 | } |
734 | } | |
735 | ||
013978b6 | 736 | out: |
e4d6b795 MB |
737 | return err; |
738 | } | |
739 | ||
740 | /* Shutdown the DMA controller. */ | |
741 | static void dmacontroller_cleanup(struct b43_dmaring *ring) | |
742 | { | |
743 | if (ring->tx) { | |
744 | b43_dmacontroller_tx_reset(ring->dev, ring->mmio_base, | |
b79caa68 MB |
745 | ring->type); |
746 | if (ring->type == B43_DMA_64BIT) { | |
e4d6b795 MB |
747 | b43_dma_write(ring, B43_DMA64_TXRINGLO, 0); |
748 | b43_dma_write(ring, B43_DMA64_TXRINGHI, 0); | |
749 | } else | |
750 | b43_dma_write(ring, B43_DMA32_TXRING, 0); | |
751 | } else { | |
752 | b43_dmacontroller_rx_reset(ring->dev, ring->mmio_base, | |
b79caa68 MB |
753 | ring->type); |
754 | if (ring->type == B43_DMA_64BIT) { | |
e4d6b795 MB |
755 | b43_dma_write(ring, B43_DMA64_RXRINGLO, 0); |
756 | b43_dma_write(ring, B43_DMA64_RXRINGHI, 0); | |
757 | } else | |
758 | b43_dma_write(ring, B43_DMA32_RXRING, 0); | |
759 | } | |
760 | } | |
761 | ||
762 | static void free_all_descbuffers(struct b43_dmaring *ring) | |
763 | { | |
764 | struct b43_dmadesc_generic *desc; | |
765 | struct b43_dmadesc_meta *meta; | |
766 | int i; | |
767 | ||
768 | if (!ring->used_slots) | |
769 | return; | |
770 | for (i = 0; i < ring->nr_slots; i++) { | |
771 | desc = ring->ops->idx2desc(ring, i, &meta); | |
772 | ||
07681e21 | 773 | if (!meta->skb || b43_dma_ptr_is_poisoned(meta->skb)) { |
e4d6b795 MB |
774 | B43_WARN_ON(!ring->tx); |
775 | continue; | |
776 | } | |
777 | if (ring->tx) { | |
778 | unmap_descbuffer(ring, meta->dmaaddr, | |
779 | meta->skb->len, 1); | |
780 | } else { | |
781 | unmap_descbuffer(ring, meta->dmaaddr, | |
782 | ring->rx_buffersize, 0); | |
783 | } | |
784 | free_descriptor_buffer(ring, meta); | |
785 | } | |
786 | } | |
787 | ||
788 | static u64 supported_dma_mask(struct b43_wldev *dev) | |
789 | { | |
790 | u32 tmp; | |
791 | u16 mmio_base; | |
792 | ||
793 | tmp = b43_read32(dev, SSB_TMSHIGH); | |
794 | if (tmp & SSB_TMSHIGH_DMA64) | |
6a35528a | 795 | return DMA_BIT_MASK(64); |
e4d6b795 MB |
796 | mmio_base = b43_dmacontroller_base(0, 0); |
797 | b43_write32(dev, mmio_base + B43_DMA32_TXCTL, B43_DMA32_TXADDREXT_MASK); | |
798 | tmp = b43_read32(dev, mmio_base + B43_DMA32_TXCTL); | |
799 | if (tmp & B43_DMA32_TXADDREXT_MASK) | |
284901a9 | 800 | return DMA_BIT_MASK(32); |
e4d6b795 | 801 | |
28b76796 | 802 | return DMA_BIT_MASK(30); |
e4d6b795 MB |
803 | } |
804 | ||
5100d5ac MB |
805 | static enum b43_dmatype dma_mask_to_engine_type(u64 dmamask) |
806 | { | |
28b76796 | 807 | if (dmamask == DMA_BIT_MASK(30)) |
5100d5ac | 808 | return B43_DMA_30BIT; |
284901a9 | 809 | if (dmamask == DMA_BIT_MASK(32)) |
5100d5ac | 810 | return B43_DMA_32BIT; |
6a35528a | 811 | if (dmamask == DMA_BIT_MASK(64)) |
5100d5ac MB |
812 | return B43_DMA_64BIT; |
813 | B43_WARN_ON(1); | |
814 | return B43_DMA_30BIT; | |
815 | } | |
816 | ||
e4d6b795 MB |
817 | /* Main initialization function. */ |
818 | static | |
819 | struct b43_dmaring *b43_setup_dmaring(struct b43_wldev *dev, | |
820 | int controller_index, | |
b79caa68 MB |
821 | int for_tx, |
822 | enum b43_dmatype type) | |
e4d6b795 MB |
823 | { |
824 | struct b43_dmaring *ring; | |
07681e21 | 825 | int i, err; |
e4d6b795 MB |
826 | dma_addr_t dma_test; |
827 | ||
828 | ring = kzalloc(sizeof(*ring), GFP_KERNEL); | |
829 | if (!ring) | |
830 | goto out; | |
831 | ||
028118a5 | 832 | ring->nr_slots = B43_RXRING_SLOTS; |
e4d6b795 | 833 | if (for_tx) |
028118a5 | 834 | ring->nr_slots = B43_TXRING_SLOTS; |
e4d6b795 | 835 | |
028118a5 | 836 | ring->meta = kcalloc(ring->nr_slots, sizeof(struct b43_dmadesc_meta), |
e4d6b795 MB |
837 | GFP_KERNEL); |
838 | if (!ring->meta) | |
839 | goto err_kfree_ring; | |
07681e21 MB |
840 | for (i = 0; i < ring->nr_slots; i++) |
841 | ring->meta->skb = B43_DMA_PTR_POISON; | |
028118a5 MB |
842 | |
843 | ring->type = type; | |
844 | ring->dev = dev; | |
845 | ring->mmio_base = b43_dmacontroller_base(type, controller_index); | |
846 | ring->index = controller_index; | |
847 | if (type == B43_DMA_64BIT) | |
848 | ring->ops = &dma64_ops; | |
849 | else | |
850 | ring->ops = &dma32_ops; | |
e4d6b795 | 851 | if (for_tx) { |
028118a5 MB |
852 | ring->tx = 1; |
853 | ring->current_slot = -1; | |
854 | } else { | |
855 | if (ring->index == 0) { | |
856 | ring->rx_buffersize = B43_DMA0_RX_BUFFERSIZE; | |
857 | ring->frameoffset = B43_DMA0_RX_FRAMEOFFSET; | |
028118a5 MB |
858 | } else |
859 | B43_WARN_ON(1); | |
860 | } | |
028118a5 MB |
861 | #ifdef CONFIG_B43_DEBUG |
862 | ring->last_injected_overflow = jiffies; | |
863 | #endif | |
864 | ||
865 | if (for_tx) { | |
2d071ca5 MB |
866 | /* Assumption: B43_TXRING_SLOTS can be divided by TX_SLOTS_PER_FRAME */ |
867 | BUILD_BUG_ON(B43_TXRING_SLOTS % TX_SLOTS_PER_FRAME != 0); | |
868 | ||
bdceeb2d | 869 | ring->txhdr_cache = kcalloc(ring->nr_slots / TX_SLOTS_PER_FRAME, |
eb189d8b | 870 | b43_txhdr_size(dev), |
e4d6b795 MB |
871 | GFP_KERNEL); |
872 | if (!ring->txhdr_cache) | |
873 | goto err_kfree_meta; | |
874 | ||
875 | /* test for ability to dma to txhdr_cache */ | |
f225763a MB |
876 | dma_test = ssb_dma_map_single(dev->dev, |
877 | ring->txhdr_cache, | |
878 | b43_txhdr_size(dev), | |
879 | DMA_TO_DEVICE); | |
e4d6b795 | 880 | |
ffa9256a MB |
881 | if (b43_dma_mapping_error(ring, dma_test, |
882 | b43_txhdr_size(dev), 1)) { | |
e4d6b795 MB |
883 | /* ugh realloc */ |
884 | kfree(ring->txhdr_cache); | |
bdceeb2d | 885 | ring->txhdr_cache = kcalloc(ring->nr_slots / TX_SLOTS_PER_FRAME, |
eb189d8b | 886 | b43_txhdr_size(dev), |
e4d6b795 MB |
887 | GFP_KERNEL | GFP_DMA); |
888 | if (!ring->txhdr_cache) | |
889 | goto err_kfree_meta; | |
890 | ||
f225763a MB |
891 | dma_test = ssb_dma_map_single(dev->dev, |
892 | ring->txhdr_cache, | |
893 | b43_txhdr_size(dev), | |
894 | DMA_TO_DEVICE); | |
e4d6b795 | 895 | |
b79caa68 | 896 | if (b43_dma_mapping_error(ring, dma_test, |
539e6f8c MB |
897 | b43_txhdr_size(dev), 1)) { |
898 | ||
899 | b43err(dev->wl, | |
900 | "TXHDR DMA allocation failed\n"); | |
e4d6b795 | 901 | goto err_kfree_txhdr_cache; |
539e6f8c | 902 | } |
e4d6b795 MB |
903 | } |
904 | ||
f225763a MB |
905 | ssb_dma_unmap_single(dev->dev, |
906 | dma_test, b43_txhdr_size(dev), | |
907 | DMA_TO_DEVICE); | |
e4d6b795 MB |
908 | } |
909 | ||
e4d6b795 MB |
910 | err = alloc_ringmemory(ring); |
911 | if (err) | |
912 | goto err_kfree_txhdr_cache; | |
913 | err = dmacontroller_setup(ring); | |
914 | if (err) | |
915 | goto err_free_ringmemory; | |
916 | ||
917 | out: | |
918 | return ring; | |
919 | ||
920 | err_free_ringmemory: | |
921 | free_ringmemory(ring); | |
922 | err_kfree_txhdr_cache: | |
923 | kfree(ring->txhdr_cache); | |
924 | err_kfree_meta: | |
925 | kfree(ring->meta); | |
926 | err_kfree_ring: | |
927 | kfree(ring); | |
928 | ring = NULL; | |
929 | goto out; | |
930 | } | |
931 | ||
57df40d2 MB |
932 | #define divide(a, b) ({ \ |
933 | typeof(a) __a = a; \ | |
934 | do_div(__a, b); \ | |
935 | __a; \ | |
936 | }) | |
937 | ||
938 | #define modulo(a, b) ({ \ | |
939 | typeof(a) __a = a; \ | |
940 | do_div(__a, b); \ | |
941 | }) | |
942 | ||
e4d6b795 | 943 | /* Main cleanup function. */ |
b27faf8e MB |
944 | static void b43_destroy_dmaring(struct b43_dmaring *ring, |
945 | const char *ringname) | |
e4d6b795 MB |
946 | { |
947 | if (!ring) | |
948 | return; | |
949 | ||
57df40d2 MB |
950 | #ifdef CONFIG_B43_DEBUG |
951 | { | |
952 | /* Print some statistics. */ | |
953 | u64 failed_packets = ring->nr_failed_tx_packets; | |
954 | u64 succeed_packets = ring->nr_succeed_tx_packets; | |
955 | u64 nr_packets = failed_packets + succeed_packets; | |
956 | u64 permille_failed = 0, average_tries = 0; | |
957 | ||
958 | if (nr_packets) | |
959 | permille_failed = divide(failed_packets * 1000, nr_packets); | |
960 | if (nr_packets) | |
961 | average_tries = divide(ring->nr_total_packet_tries * 100, nr_packets); | |
962 | ||
963 | b43dbg(ring->dev->wl, "DMA-%u %s: " | |
964 | "Used slots %d/%d, Failed frames %llu/%llu = %llu.%01llu%%, " | |
965 | "Average tries %llu.%02llu\n", | |
966 | (unsigned int)(ring->type), ringname, | |
967 | ring->max_used_slots, | |
968 | ring->nr_slots, | |
969 | (unsigned long long)failed_packets, | |
87d96114 | 970 | (unsigned long long)nr_packets, |
57df40d2 MB |
971 | (unsigned long long)divide(permille_failed, 10), |
972 | (unsigned long long)modulo(permille_failed, 10), | |
973 | (unsigned long long)divide(average_tries, 100), | |
974 | (unsigned long long)modulo(average_tries, 100)); | |
975 | } | |
976 | #endif /* DEBUG */ | |
977 | ||
e4d6b795 MB |
978 | /* Device IRQs are disabled prior entering this function, |
979 | * so no need to take care of concurrency with rx handler stuff. | |
980 | */ | |
981 | dmacontroller_cleanup(ring); | |
982 | free_all_descbuffers(ring); | |
983 | free_ringmemory(ring); | |
984 | ||
985 | kfree(ring->txhdr_cache); | |
986 | kfree(ring->meta); | |
987 | kfree(ring); | |
988 | } | |
989 | ||
b27faf8e MB |
990 | #define destroy_ring(dma, ring) do { \ |
991 | b43_destroy_dmaring((dma)->ring, __stringify(ring)); \ | |
992 | (dma)->ring = NULL; \ | |
993 | } while (0) | |
994 | ||
e4d6b795 MB |
995 | void b43_dma_free(struct b43_wldev *dev) |
996 | { | |
5100d5ac MB |
997 | struct b43_dma *dma; |
998 | ||
999 | if (b43_using_pio_transfers(dev)) | |
1000 | return; | |
1001 | dma = &dev->dma; | |
e4d6b795 | 1002 | |
b27faf8e MB |
1003 | destroy_ring(dma, rx_ring); |
1004 | destroy_ring(dma, tx_ring_AC_BK); | |
1005 | destroy_ring(dma, tx_ring_AC_BE); | |
1006 | destroy_ring(dma, tx_ring_AC_VI); | |
1007 | destroy_ring(dma, tx_ring_AC_VO); | |
1008 | destroy_ring(dma, tx_ring_mcast); | |
e4d6b795 MB |
1009 | } |
1010 | ||
1033b3ea MB |
1011 | static int b43_dma_set_mask(struct b43_wldev *dev, u64 mask) |
1012 | { | |
1013 | u64 orig_mask = mask; | |
1014 | bool fallback = 0; | |
1015 | int err; | |
1016 | ||
1017 | /* Try to set the DMA mask. If it fails, try falling back to a | |
1018 | * lower mask, as we can always also support a lower one. */ | |
1019 | while (1) { | |
1020 | err = ssb_dma_set_mask(dev->dev, mask); | |
1021 | if (!err) | |
1022 | break; | |
6a35528a | 1023 | if (mask == DMA_BIT_MASK(64)) { |
284901a9 | 1024 | mask = DMA_BIT_MASK(32); |
1033b3ea MB |
1025 | fallback = 1; |
1026 | continue; | |
1027 | } | |
284901a9 | 1028 | if (mask == DMA_BIT_MASK(32)) { |
28b76796 | 1029 | mask = DMA_BIT_MASK(30); |
1033b3ea MB |
1030 | fallback = 1; |
1031 | continue; | |
1032 | } | |
1033 | b43err(dev->wl, "The machine/kernel does not support " | |
1034 | "the required %u-bit DMA mask\n", | |
1035 | (unsigned int)dma_mask_to_engine_type(orig_mask)); | |
1036 | return -EOPNOTSUPP; | |
1037 | } | |
1038 | if (fallback) { | |
1039 | b43info(dev->wl, "DMA mask fallback from %u-bit to %u-bit\n", | |
1040 | (unsigned int)dma_mask_to_engine_type(orig_mask), | |
1041 | (unsigned int)dma_mask_to_engine_type(mask)); | |
1042 | } | |
1043 | ||
1044 | return 0; | |
1045 | } | |
1046 | ||
e4d6b795 MB |
1047 | int b43_dma_init(struct b43_wldev *dev) |
1048 | { | |
1049 | struct b43_dma *dma = &dev->dma; | |
e4d6b795 MB |
1050 | int err; |
1051 | u64 dmamask; | |
b79caa68 | 1052 | enum b43_dmatype type; |
e4d6b795 MB |
1053 | |
1054 | dmamask = supported_dma_mask(dev); | |
5100d5ac | 1055 | type = dma_mask_to_engine_type(dmamask); |
1033b3ea MB |
1056 | err = b43_dma_set_mask(dev, dmamask); |
1057 | if (err) | |
1058 | return err; | |
e4d6b795 MB |
1059 | |
1060 | err = -ENOMEM; | |
1061 | /* setup TX DMA channels. */ | |
b27faf8e MB |
1062 | dma->tx_ring_AC_BK = b43_setup_dmaring(dev, 0, 1, type); |
1063 | if (!dma->tx_ring_AC_BK) | |
e4d6b795 | 1064 | goto out; |
e4d6b795 | 1065 | |
b27faf8e MB |
1066 | dma->tx_ring_AC_BE = b43_setup_dmaring(dev, 1, 1, type); |
1067 | if (!dma->tx_ring_AC_BE) | |
1068 | goto err_destroy_bk; | |
e4d6b795 | 1069 | |
b27faf8e MB |
1070 | dma->tx_ring_AC_VI = b43_setup_dmaring(dev, 2, 1, type); |
1071 | if (!dma->tx_ring_AC_VI) | |
1072 | goto err_destroy_be; | |
e4d6b795 | 1073 | |
b27faf8e MB |
1074 | dma->tx_ring_AC_VO = b43_setup_dmaring(dev, 3, 1, type); |
1075 | if (!dma->tx_ring_AC_VO) | |
1076 | goto err_destroy_vi; | |
e4d6b795 | 1077 | |
b27faf8e MB |
1078 | dma->tx_ring_mcast = b43_setup_dmaring(dev, 4, 1, type); |
1079 | if (!dma->tx_ring_mcast) | |
1080 | goto err_destroy_vo; | |
e4d6b795 | 1081 | |
b27faf8e MB |
1082 | /* setup RX DMA channel. */ |
1083 | dma->rx_ring = b43_setup_dmaring(dev, 0, 0, type); | |
1084 | if (!dma->rx_ring) | |
1085 | goto err_destroy_mcast; | |
e4d6b795 | 1086 | |
b27faf8e MB |
1087 | /* No support for the TX status DMA ring. */ |
1088 | B43_WARN_ON(dev->dev->id.revision < 5); | |
e4d6b795 | 1089 | |
b79caa68 MB |
1090 | b43dbg(dev->wl, "%u-bit DMA initialized\n", |
1091 | (unsigned int)type); | |
e4d6b795 | 1092 | err = 0; |
b27faf8e | 1093 | out: |
e4d6b795 MB |
1094 | return err; |
1095 | ||
b27faf8e MB |
1096 | err_destroy_mcast: |
1097 | destroy_ring(dma, tx_ring_mcast); | |
1098 | err_destroy_vo: | |
1099 | destroy_ring(dma, tx_ring_AC_VO); | |
1100 | err_destroy_vi: | |
1101 | destroy_ring(dma, tx_ring_AC_VI); | |
1102 | err_destroy_be: | |
1103 | destroy_ring(dma, tx_ring_AC_BE); | |
1104 | err_destroy_bk: | |
1105 | destroy_ring(dma, tx_ring_AC_BK); | |
1106 | return err; | |
e4d6b795 MB |
1107 | } |
1108 | ||
1109 | /* Generate a cookie for the TX header. */ | |
1110 | static u16 generate_cookie(struct b43_dmaring *ring, int slot) | |
1111 | { | |
b27faf8e | 1112 | u16 cookie; |
e4d6b795 MB |
1113 | |
1114 | /* Use the upper 4 bits of the cookie as | |
1115 | * DMA controller ID and store the slot number | |
1116 | * in the lower 12 bits. | |
1117 | * Note that the cookie must never be 0, as this | |
1118 | * is a special value used in RX path. | |
280d0e16 MB |
1119 | * It can also not be 0xFFFF because that is special |
1120 | * for multicast frames. | |
e4d6b795 | 1121 | */ |
b27faf8e | 1122 | cookie = (((u16)ring->index + 1) << 12); |
e4d6b795 | 1123 | B43_WARN_ON(slot & ~0x0FFF); |
b27faf8e | 1124 | cookie |= (u16)slot; |
e4d6b795 MB |
1125 | |
1126 | return cookie; | |
1127 | } | |
1128 | ||
1129 | /* Inspect a cookie and find out to which controller/slot it belongs. */ | |
1130 | static | |
1131 | struct b43_dmaring *parse_cookie(struct b43_wldev *dev, u16 cookie, int *slot) | |
1132 | { | |
1133 | struct b43_dma *dma = &dev->dma; | |
1134 | struct b43_dmaring *ring = NULL; | |
1135 | ||
1136 | switch (cookie & 0xF000) { | |
280d0e16 | 1137 | case 0x1000: |
b27faf8e | 1138 | ring = dma->tx_ring_AC_BK; |
e4d6b795 | 1139 | break; |
280d0e16 | 1140 | case 0x2000: |
b27faf8e | 1141 | ring = dma->tx_ring_AC_BE; |
e4d6b795 | 1142 | break; |
280d0e16 | 1143 | case 0x3000: |
b27faf8e | 1144 | ring = dma->tx_ring_AC_VI; |
e4d6b795 | 1145 | break; |
280d0e16 | 1146 | case 0x4000: |
b27faf8e | 1147 | ring = dma->tx_ring_AC_VO; |
e4d6b795 | 1148 | break; |
280d0e16 | 1149 | case 0x5000: |
b27faf8e | 1150 | ring = dma->tx_ring_mcast; |
e4d6b795 | 1151 | break; |
e4d6b795 MB |
1152 | } |
1153 | *slot = (cookie & 0x0FFF); | |
07681e21 MB |
1154 | if (unlikely(!ring || *slot < 0 || *slot >= ring->nr_slots)) { |
1155 | b43dbg(dev->wl, "TX-status contains " | |
1156 | "invalid cookie: 0x%04X\n", cookie); | |
1157 | return NULL; | |
1158 | } | |
e4d6b795 MB |
1159 | |
1160 | return ring; | |
1161 | } | |
1162 | ||
1163 | static int dma_tx_fragment(struct b43_dmaring *ring, | |
f54a5202 | 1164 | struct sk_buff *skb) |
e4d6b795 MB |
1165 | { |
1166 | const struct b43_dma_ops *ops = ring->ops; | |
e039fa4a | 1167 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
f54a5202 | 1168 | struct b43_private_tx_info *priv_info = b43_get_priv_tx_info(info); |
e4d6b795 | 1169 | u8 *header; |
09552ccd | 1170 | int slot, old_top_slot, old_used_slots; |
e4d6b795 MB |
1171 | int err; |
1172 | struct b43_dmadesc_generic *desc; | |
1173 | struct b43_dmadesc_meta *meta; | |
1174 | struct b43_dmadesc_meta *meta_hdr; | |
280d0e16 | 1175 | u16 cookie; |
eb189d8b | 1176 | size_t hdrsize = b43_txhdr_size(ring->dev); |
e4d6b795 | 1177 | |
bdceeb2d MB |
1178 | /* Important note: If the number of used DMA slots per TX frame |
1179 | * is changed here, the TX_SLOTS_PER_FRAME definition at the top of | |
1180 | * the file has to be updated, too! | |
1181 | */ | |
e4d6b795 | 1182 | |
09552ccd MB |
1183 | old_top_slot = ring->current_slot; |
1184 | old_used_slots = ring->used_slots; | |
1185 | ||
e4d6b795 MB |
1186 | /* Get a slot for the header. */ |
1187 | slot = request_slot(ring); | |
1188 | desc = ops->idx2desc(ring, slot, &meta_hdr); | |
1189 | memset(meta_hdr, 0, sizeof(*meta_hdr)); | |
1190 | ||
bdceeb2d | 1191 | header = &(ring->txhdr_cache[(slot / TX_SLOTS_PER_FRAME) * hdrsize]); |
280d0e16 | 1192 | cookie = generate_cookie(ring, slot); |
09552ccd | 1193 | err = b43_generate_txhdr(ring->dev, header, |
035d0243 | 1194 | skb, info, cookie); |
09552ccd MB |
1195 | if (unlikely(err)) { |
1196 | ring->current_slot = old_top_slot; | |
1197 | ring->used_slots = old_used_slots; | |
1198 | return err; | |
1199 | } | |
e4d6b795 MB |
1200 | |
1201 | meta_hdr->dmaaddr = map_descbuffer(ring, (unsigned char *)header, | |
eb189d8b | 1202 | hdrsize, 1); |
ffa9256a | 1203 | if (b43_dma_mapping_error(ring, meta_hdr->dmaaddr, hdrsize, 1)) { |
09552ccd MB |
1204 | ring->current_slot = old_top_slot; |
1205 | ring->used_slots = old_used_slots; | |
e4d6b795 | 1206 | return -EIO; |
09552ccd | 1207 | } |
e4d6b795 | 1208 | ops->fill_descriptor(ring, desc, meta_hdr->dmaaddr, |
eb189d8b | 1209 | hdrsize, 1, 0, 0); |
e4d6b795 MB |
1210 | |
1211 | /* Get a slot for the payload. */ | |
1212 | slot = request_slot(ring); | |
1213 | desc = ops->idx2desc(ring, slot, &meta); | |
1214 | memset(meta, 0, sizeof(*meta)); | |
1215 | ||
e4d6b795 MB |
1216 | meta->skb = skb; |
1217 | meta->is_last_fragment = 1; | |
f54a5202 | 1218 | priv_info->bouncebuffer = NULL; |
e4d6b795 MB |
1219 | |
1220 | meta->dmaaddr = map_descbuffer(ring, skb->data, skb->len, 1); | |
1221 | /* create a bounce buffer in zone_dma on mapping failure. */ | |
ffa9256a | 1222 | if (b43_dma_mapping_error(ring, meta->dmaaddr, skb->len, 1)) { |
f54a5202 MB |
1223 | priv_info->bouncebuffer = kmalloc(skb->len, GFP_ATOMIC | GFP_DMA); |
1224 | if (!priv_info->bouncebuffer) { | |
09552ccd MB |
1225 | ring->current_slot = old_top_slot; |
1226 | ring->used_slots = old_used_slots; | |
e4d6b795 MB |
1227 | err = -ENOMEM; |
1228 | goto out_unmap_hdr; | |
1229 | } | |
f54a5202 | 1230 | memcpy(priv_info->bouncebuffer, skb->data, skb->len); |
e4d6b795 | 1231 | |
f54a5202 | 1232 | meta->dmaaddr = map_descbuffer(ring, priv_info->bouncebuffer, skb->len, 1); |
ffa9256a | 1233 | if (b43_dma_mapping_error(ring, meta->dmaaddr, skb->len, 1)) { |
f54a5202 MB |
1234 | kfree(priv_info->bouncebuffer); |
1235 | priv_info->bouncebuffer = NULL; | |
09552ccd MB |
1236 | ring->current_slot = old_top_slot; |
1237 | ring->used_slots = old_used_slots; | |
e4d6b795 | 1238 | err = -EIO; |
f54a5202 | 1239 | goto out_unmap_hdr; |
e4d6b795 MB |
1240 | } |
1241 | } | |
1242 | ||
1243 | ops->fill_descriptor(ring, desc, meta->dmaaddr, skb->len, 0, 1, 1); | |
1244 | ||
e039fa4a | 1245 | if (info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) { |
280d0e16 MB |
1246 | /* Tell the firmware about the cookie of the last |
1247 | * mcast frame, so it can clear the more-data bit in it. */ | |
1248 | b43_shm_write16(ring->dev, B43_SHM_SHARED, | |
1249 | B43_SHM_SH_MCASTCOOKIE, cookie); | |
1250 | } | |
e4d6b795 MB |
1251 | /* Now transfer the whole frame. */ |
1252 | wmb(); | |
1253 | ops->poke_tx(ring, next_slot(ring, slot)); | |
1254 | return 0; | |
1255 | ||
280d0e16 | 1256 | out_unmap_hdr: |
e4d6b795 | 1257 | unmap_descbuffer(ring, meta_hdr->dmaaddr, |
eb189d8b | 1258 | hdrsize, 1); |
e4d6b795 MB |
1259 | return err; |
1260 | } | |
1261 | ||
1262 | static inline int should_inject_overflow(struct b43_dmaring *ring) | |
1263 | { | |
1264 | #ifdef CONFIG_B43_DEBUG | |
1265 | if (unlikely(b43_debug(ring->dev, B43_DBG_DMAOVERFLOW))) { | |
1266 | /* Check if we should inject another ringbuffer overflow | |
1267 | * to test handling of this situation in the stack. */ | |
1268 | unsigned long next_overflow; | |
1269 | ||
1270 | next_overflow = ring->last_injected_overflow + HZ; | |
1271 | if (time_after(jiffies, next_overflow)) { | |
1272 | ring->last_injected_overflow = jiffies; | |
1273 | b43dbg(ring->dev->wl, | |
1274 | "Injecting TX ring overflow on " | |
1275 | "DMA controller %d\n", ring->index); | |
1276 | return 1; | |
1277 | } | |
1278 | } | |
1279 | #endif /* CONFIG_B43_DEBUG */ | |
1280 | return 0; | |
1281 | } | |
1282 | ||
e6f5b934 | 1283 | /* Static mapping of mac80211's queues (priorities) to b43 DMA rings. */ |
99da185a JD |
1284 | static struct b43_dmaring *select_ring_by_priority(struct b43_wldev *dev, |
1285 | u8 queue_prio) | |
e6f5b934 MB |
1286 | { |
1287 | struct b43_dmaring *ring; | |
1288 | ||
403a3a13 | 1289 | if (dev->qos_enabled) { |
e6f5b934 MB |
1290 | /* 0 = highest priority */ |
1291 | switch (queue_prio) { | |
1292 | default: | |
1293 | B43_WARN_ON(1); | |
1294 | /* fallthrough */ | |
1295 | case 0: | |
b27faf8e | 1296 | ring = dev->dma.tx_ring_AC_VO; |
e6f5b934 MB |
1297 | break; |
1298 | case 1: | |
b27faf8e | 1299 | ring = dev->dma.tx_ring_AC_VI; |
e6f5b934 MB |
1300 | break; |
1301 | case 2: | |
b27faf8e | 1302 | ring = dev->dma.tx_ring_AC_BE; |
e6f5b934 MB |
1303 | break; |
1304 | case 3: | |
b27faf8e | 1305 | ring = dev->dma.tx_ring_AC_BK; |
e6f5b934 MB |
1306 | break; |
1307 | } | |
1308 | } else | |
b27faf8e | 1309 | ring = dev->dma.tx_ring_AC_BE; |
e6f5b934 MB |
1310 | |
1311 | return ring; | |
1312 | } | |
1313 | ||
e039fa4a | 1314 | int b43_dma_tx(struct b43_wldev *dev, struct sk_buff *skb) |
e4d6b795 MB |
1315 | { |
1316 | struct b43_dmaring *ring; | |
280d0e16 | 1317 | struct ieee80211_hdr *hdr; |
e4d6b795 | 1318 | int err = 0; |
e039fa4a | 1319 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
e4d6b795 | 1320 | |
280d0e16 | 1321 | hdr = (struct ieee80211_hdr *)skb->data; |
e039fa4a | 1322 | if (info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) { |
280d0e16 | 1323 | /* The multicast ring will be sent after the DTIM */ |
b27faf8e | 1324 | ring = dev->dma.tx_ring_mcast; |
280d0e16 MB |
1325 | /* Set the more-data bit. Ucode will clear it on |
1326 | * the last frame for us. */ | |
1327 | hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA); | |
1328 | } else { | |
1329 | /* Decide by priority where to put this frame. */ | |
e2530083 JB |
1330 | ring = select_ring_by_priority( |
1331 | dev, skb_get_queue_mapping(skb)); | |
280d0e16 MB |
1332 | } |
1333 | ||
e4d6b795 | 1334 | B43_WARN_ON(!ring->tx); |
ca2d559e | 1335 | |
18c69510 LF |
1336 | if (unlikely(ring->stopped)) { |
1337 | /* We get here only because of a bug in mac80211. | |
1338 | * Because of a race, one packet may be queued after | |
1339 | * the queue is stopped, thus we got called when we shouldn't. | |
1340 | * For now, just refuse the transmit. */ | |
1341 | if (b43_debug(dev, B43_DBG_DMAVERBOSE)) | |
1342 | b43err(dev->wl, "Packet after queue stopped\n"); | |
1343 | err = -ENOSPC; | |
637dae3f | 1344 | goto out; |
18c69510 LF |
1345 | } |
1346 | ||
1347 | if (unlikely(WARN_ON(free_slots(ring) < TX_SLOTS_PER_FRAME))) { | |
1348 | /* If we get here, we have a real error with the queue | |
1349 | * full, but queues not stopped. */ | |
1350 | b43err(dev->wl, "DMA queue overflow\n"); | |
e4d6b795 | 1351 | err = -ENOSPC; |
637dae3f | 1352 | goto out; |
e4d6b795 | 1353 | } |
e4d6b795 | 1354 | |
e6f5b934 MB |
1355 | /* Assign the queue number to the ring (if not already done before) |
1356 | * so TX status handling can use it. The queue to ring mapping is | |
1357 | * static, so we don't need to store it per frame. */ | |
e2530083 | 1358 | ring->queue_prio = skb_get_queue_mapping(skb); |
e6f5b934 | 1359 | |
f54a5202 | 1360 | err = dma_tx_fragment(ring, skb); |
09552ccd MB |
1361 | if (unlikely(err == -ENOKEY)) { |
1362 | /* Drop this packet, as we don't have the encryption key | |
1363 | * anymore and must not transmit it unencrypted. */ | |
1364 | dev_kfree_skb_any(skb); | |
1365 | err = 0; | |
637dae3f | 1366 | goto out; |
09552ccd | 1367 | } |
e4d6b795 MB |
1368 | if (unlikely(err)) { |
1369 | b43err(dev->wl, "DMA tx mapping failure\n"); | |
637dae3f | 1370 | goto out; |
e4d6b795 MB |
1371 | } |
1372 | ring->nr_tx_packets++; | |
bdceeb2d | 1373 | if ((free_slots(ring) < TX_SLOTS_PER_FRAME) || |
e4d6b795 MB |
1374 | should_inject_overflow(ring)) { |
1375 | /* This TX ring is full. */ | |
e2530083 | 1376 | ieee80211_stop_queue(dev->wl->hw, skb_get_queue_mapping(skb)); |
e4d6b795 MB |
1377 | ring->stopped = 1; |
1378 | if (b43_debug(dev, B43_DBG_DMAVERBOSE)) { | |
1379 | b43dbg(dev->wl, "Stopped TX ring %d\n", ring->index); | |
1380 | } | |
1381 | } | |
637dae3f | 1382 | out: |
e4d6b795 MB |
1383 | |
1384 | return err; | |
1385 | } | |
1386 | ||
1387 | void b43_dma_handle_txstatus(struct b43_wldev *dev, | |
1388 | const struct b43_txstatus *status) | |
1389 | { | |
1390 | const struct b43_dma_ops *ops; | |
1391 | struct b43_dmaring *ring; | |
1392 | struct b43_dmadesc_generic *desc; | |
1393 | struct b43_dmadesc_meta *meta; | |
07681e21 | 1394 | int slot, firstused; |
5100d5ac | 1395 | bool frame_succeed; |
e4d6b795 MB |
1396 | |
1397 | ring = parse_cookie(dev, status->cookie, &slot); | |
1398 | if (unlikely(!ring)) | |
1399 | return; | |
e4d6b795 | 1400 | B43_WARN_ON(!ring->tx); |
07681e21 MB |
1401 | |
1402 | /* Sanity check: TX packets are processed in-order on one ring. | |
1403 | * Check if the slot deduced from the cookie really is the first | |
1404 | * used slot. */ | |
1405 | firstused = ring->current_slot - ring->used_slots + 1; | |
1406 | if (firstused < 0) | |
1407 | firstused = ring->nr_slots + firstused; | |
1408 | if (unlikely(slot != firstused)) { | |
1409 | /* This possibly is a firmware bug and will result in | |
1410 | * malfunction, memory leaks and/or stall of DMA functionality. */ | |
1411 | b43dbg(dev->wl, "Out of order TX status report on DMA ring %d. " | |
1412 | "Expected %d, but got %d\n", | |
1413 | ring->index, firstused, slot); | |
1414 | return; | |
1415 | } | |
1416 | ||
e4d6b795 MB |
1417 | ops = ring->ops; |
1418 | while (1) { | |
07681e21 | 1419 | B43_WARN_ON(slot < 0 || slot >= ring->nr_slots); |
e4d6b795 MB |
1420 | desc = ops->idx2desc(ring, slot, &meta); |
1421 | ||
07681e21 MB |
1422 | if (b43_dma_ptr_is_poisoned(meta->skb)) { |
1423 | b43dbg(dev->wl, "Poisoned TX slot %d (first=%d) " | |
1424 | "on ring %d\n", | |
1425 | slot, firstused, ring->index); | |
1426 | break; | |
1427 | } | |
f54a5202 MB |
1428 | if (meta->skb) { |
1429 | struct b43_private_tx_info *priv_info = | |
1430 | b43_get_priv_tx_info(IEEE80211_SKB_CB(meta->skb)); | |
1431 | ||
1432 | unmap_descbuffer(ring, meta->dmaaddr, meta->skb->len, 1); | |
1433 | kfree(priv_info->bouncebuffer); | |
1434 | priv_info->bouncebuffer = NULL; | |
1435 | } else { | |
e4d6b795 | 1436 | unmap_descbuffer(ring, meta->dmaaddr, |
eb189d8b | 1437 | b43_txhdr_size(dev), 1); |
f54a5202 | 1438 | } |
e4d6b795 MB |
1439 | |
1440 | if (meta->is_last_fragment) { | |
e039fa4a JB |
1441 | struct ieee80211_tx_info *info; |
1442 | ||
07681e21 MB |
1443 | if (unlikely(!meta->skb)) { |
1444 | /* This is a scatter-gather fragment of a frame, so | |
1445 | * the skb pointer must not be NULL. */ | |
1446 | b43dbg(dev->wl, "TX status unexpected NULL skb " | |
1447 | "at slot %d (first=%d) on ring %d\n", | |
1448 | slot, firstused, ring->index); | |
1449 | break; | |
1450 | } | |
e039fa4a JB |
1451 | |
1452 | info = IEEE80211_SKB_CB(meta->skb); | |
1453 | ||
e039fa4a JB |
1454 | /* |
1455 | * Call back to inform the ieee80211 subsystem about | |
1456 | * the status of the transmission. | |
e4d6b795 | 1457 | */ |
e6a9854b | 1458 | frame_succeed = b43_fill_txstatus_report(dev, info, status); |
5100d5ac MB |
1459 | #ifdef CONFIG_B43_DEBUG |
1460 | if (frame_succeed) | |
1461 | ring->nr_succeed_tx_packets++; | |
1462 | else | |
1463 | ring->nr_failed_tx_packets++; | |
1464 | ring->nr_total_packet_tries += status->frame_count; | |
1465 | #endif /* DEBUG */ | |
ce6c4a13 | 1466 | ieee80211_tx_status(dev->wl->hw, meta->skb); |
e039fa4a | 1467 | |
07681e21 MB |
1468 | /* skb will be freed by ieee80211_tx_status(). |
1469 | * Poison our pointer. */ | |
1470 | meta->skb = B43_DMA_PTR_POISON; | |
e4d6b795 MB |
1471 | } else { |
1472 | /* No need to call free_descriptor_buffer here, as | |
1473 | * this is only the txhdr, which is not allocated. | |
1474 | */ | |
07681e21 MB |
1475 | if (unlikely(meta->skb)) { |
1476 | b43dbg(dev->wl, "TX status unexpected non-NULL skb " | |
1477 | "at slot %d (first=%d) on ring %d\n", | |
1478 | slot, firstused, ring->index); | |
1479 | break; | |
1480 | } | |
e4d6b795 MB |
1481 | } |
1482 | ||
1483 | /* Everything unmapped and free'd. So it's not used anymore. */ | |
1484 | ring->used_slots--; | |
1485 | ||
07681e21 MB |
1486 | if (meta->is_last_fragment) { |
1487 | /* This is the last scatter-gather | |
1488 | * fragment of the frame. We are done. */ | |
e4d6b795 | 1489 | break; |
07681e21 | 1490 | } |
e4d6b795 MB |
1491 | slot = next_slot(ring, slot); |
1492 | } | |
e4d6b795 | 1493 | if (ring->stopped) { |
bdceeb2d | 1494 | B43_WARN_ON(free_slots(ring) < TX_SLOTS_PER_FRAME); |
e6f5b934 | 1495 | ieee80211_wake_queue(dev->wl->hw, ring->queue_prio); |
e4d6b795 MB |
1496 | ring->stopped = 0; |
1497 | if (b43_debug(dev, B43_DBG_DMAVERBOSE)) { | |
1498 | b43dbg(dev->wl, "Woke up TX ring %d\n", ring->index); | |
1499 | } | |
1500 | } | |
e4d6b795 MB |
1501 | } |
1502 | ||
1503 | void b43_dma_get_tx_stats(struct b43_wldev *dev, | |
1504 | struct ieee80211_tx_queue_stats *stats) | |
1505 | { | |
1506 | const int nr_queues = dev->wl->hw->queues; | |
1507 | struct b43_dmaring *ring; | |
e4d6b795 MB |
1508 | int i; |
1509 | ||
1510 | for (i = 0; i < nr_queues; i++) { | |
e6f5b934 | 1511 | ring = select_ring_by_priority(dev, i); |
e4d6b795 | 1512 | |
bdceeb2d MB |
1513 | stats[i].len = ring->used_slots / TX_SLOTS_PER_FRAME; |
1514 | stats[i].limit = ring->nr_slots / TX_SLOTS_PER_FRAME; | |
57ffc589 | 1515 | stats[i].count = ring->nr_tx_packets; |
e4d6b795 MB |
1516 | } |
1517 | } | |
1518 | ||
1519 | static void dma_rx(struct b43_dmaring *ring, int *slot) | |
1520 | { | |
1521 | const struct b43_dma_ops *ops = ring->ops; | |
1522 | struct b43_dmadesc_generic *desc; | |
1523 | struct b43_dmadesc_meta *meta; | |
1524 | struct b43_rxhdr_fw4 *rxhdr; | |
1525 | struct sk_buff *skb; | |
1526 | u16 len; | |
1527 | int err; | |
1528 | dma_addr_t dmaaddr; | |
1529 | ||
1530 | desc = ops->idx2desc(ring, *slot, &meta); | |
1531 | ||
1532 | sync_descbuffer_for_cpu(ring, meta->dmaaddr, ring->rx_buffersize); | |
1533 | skb = meta->skb; | |
1534 | ||
e4d6b795 MB |
1535 | rxhdr = (struct b43_rxhdr_fw4 *)skb->data; |
1536 | len = le16_to_cpu(rxhdr->frame_len); | |
1537 | if (len == 0) { | |
1538 | int i = 0; | |
1539 | ||
1540 | do { | |
1541 | udelay(2); | |
1542 | barrier(); | |
1543 | len = le16_to_cpu(rxhdr->frame_len); | |
1544 | } while (len == 0 && i++ < 5); | |
1545 | if (unlikely(len == 0)) { | |
cf68636a MB |
1546 | dmaaddr = meta->dmaaddr; |
1547 | goto drop_recycle_buffer; | |
e4d6b795 MB |
1548 | } |
1549 | } | |
ec9a1d8c MB |
1550 | if (unlikely(b43_rx_buffer_is_poisoned(ring, skb))) { |
1551 | /* Something went wrong with the DMA. | |
1552 | * The device did not touch the buffer and did not overwrite the poison. */ | |
1553 | b43dbg(ring->dev->wl, "DMA RX: Dropping poisoned buffer.\n"); | |
cf68636a MB |
1554 | dmaaddr = meta->dmaaddr; |
1555 | goto drop_recycle_buffer; | |
ec9a1d8c | 1556 | } |
e4d6b795 MB |
1557 | if (unlikely(len > ring->rx_buffersize)) { |
1558 | /* The data did not fit into one descriptor buffer | |
1559 | * and is split over multiple buffers. | |
1560 | * This should never happen, as we try to allocate buffers | |
1561 | * big enough. So simply ignore this packet. | |
1562 | */ | |
1563 | int cnt = 0; | |
1564 | s32 tmp = len; | |
1565 | ||
1566 | while (1) { | |
1567 | desc = ops->idx2desc(ring, *slot, &meta); | |
1568 | /* recycle the descriptor buffer. */ | |
cf68636a | 1569 | b43_poison_rx_buffer(ring, meta->skb); |
e4d6b795 MB |
1570 | sync_descbuffer_for_device(ring, meta->dmaaddr, |
1571 | ring->rx_buffersize); | |
1572 | *slot = next_slot(ring, *slot); | |
1573 | cnt++; | |
1574 | tmp -= ring->rx_buffersize; | |
1575 | if (tmp <= 0) | |
1576 | break; | |
1577 | } | |
1578 | b43err(ring->dev->wl, "DMA RX buffer too small " | |
1579 | "(len: %u, buffer: %u, nr-dropped: %d)\n", | |
1580 | len, ring->rx_buffersize, cnt); | |
1581 | goto drop; | |
1582 | } | |
1583 | ||
1584 | dmaaddr = meta->dmaaddr; | |
1585 | err = setup_rx_descbuffer(ring, desc, meta, GFP_ATOMIC); | |
1586 | if (unlikely(err)) { | |
1587 | b43dbg(ring->dev->wl, "DMA RX: setup_rx_descbuffer() failed\n"); | |
cf68636a | 1588 | goto drop_recycle_buffer; |
e4d6b795 MB |
1589 | } |
1590 | ||
1591 | unmap_descbuffer(ring, dmaaddr, ring->rx_buffersize, 0); | |
1592 | skb_put(skb, len + ring->frameoffset); | |
1593 | skb_pull(skb, ring->frameoffset); | |
1594 | ||
1595 | b43_rx(ring->dev, skb, rxhdr); | |
b27faf8e | 1596 | drop: |
e4d6b795 | 1597 | return; |
cf68636a MB |
1598 | |
1599 | drop_recycle_buffer: | |
1600 | /* Poison and recycle the RX buffer. */ | |
1601 | b43_poison_rx_buffer(ring, skb); | |
1602 | sync_descbuffer_for_device(ring, dmaaddr, ring->rx_buffersize); | |
e4d6b795 MB |
1603 | } |
1604 | ||
1605 | void b43_dma_rx(struct b43_dmaring *ring) | |
1606 | { | |
1607 | const struct b43_dma_ops *ops = ring->ops; | |
1608 | int slot, current_slot; | |
1609 | int used_slots = 0; | |
1610 | ||
1611 | B43_WARN_ON(ring->tx); | |
1612 | current_slot = ops->get_current_rxslot(ring); | |
1613 | B43_WARN_ON(!(current_slot >= 0 && current_slot < ring->nr_slots)); | |
1614 | ||
1615 | slot = ring->current_slot; | |
1616 | for (; slot != current_slot; slot = next_slot(ring, slot)) { | |
1617 | dma_rx(ring, &slot); | |
1618 | update_max_used_slots(ring, ++used_slots); | |
1619 | } | |
1620 | ops->set_current_rxslot(ring, slot); | |
1621 | ring->current_slot = slot; | |
1622 | } | |
1623 | ||
1624 | static void b43_dma_tx_suspend_ring(struct b43_dmaring *ring) | |
1625 | { | |
e4d6b795 MB |
1626 | B43_WARN_ON(!ring->tx); |
1627 | ring->ops->tx_suspend(ring); | |
e4d6b795 MB |
1628 | } |
1629 | ||
1630 | static void b43_dma_tx_resume_ring(struct b43_dmaring *ring) | |
1631 | { | |
e4d6b795 MB |
1632 | B43_WARN_ON(!ring->tx); |
1633 | ring->ops->tx_resume(ring); | |
e4d6b795 MB |
1634 | } |
1635 | ||
1636 | void b43_dma_tx_suspend(struct b43_wldev *dev) | |
1637 | { | |
1638 | b43_power_saving_ctl_bits(dev, B43_PS_AWAKE); | |
b27faf8e MB |
1639 | b43_dma_tx_suspend_ring(dev->dma.tx_ring_AC_BK); |
1640 | b43_dma_tx_suspend_ring(dev->dma.tx_ring_AC_BE); | |
1641 | b43_dma_tx_suspend_ring(dev->dma.tx_ring_AC_VI); | |
1642 | b43_dma_tx_suspend_ring(dev->dma.tx_ring_AC_VO); | |
1643 | b43_dma_tx_suspend_ring(dev->dma.tx_ring_mcast); | |
e4d6b795 MB |
1644 | } |
1645 | ||
1646 | void b43_dma_tx_resume(struct b43_wldev *dev) | |
1647 | { | |
b27faf8e MB |
1648 | b43_dma_tx_resume_ring(dev->dma.tx_ring_mcast); |
1649 | b43_dma_tx_resume_ring(dev->dma.tx_ring_AC_VO); | |
1650 | b43_dma_tx_resume_ring(dev->dma.tx_ring_AC_VI); | |
1651 | b43_dma_tx_resume_ring(dev->dma.tx_ring_AC_BE); | |
1652 | b43_dma_tx_resume_ring(dev->dma.tx_ring_AC_BK); | |
e4d6b795 MB |
1653 | b43_power_saving_ctl_bits(dev, 0); |
1654 | } | |
5100d5ac MB |
1655 | |
1656 | #ifdef CONFIG_B43_PIO | |
1657 | static void direct_fifo_rx(struct b43_wldev *dev, enum b43_dmatype type, | |
1658 | u16 mmio_base, bool enable) | |
1659 | { | |
1660 | u32 ctl; | |
1661 | ||
1662 | if (type == B43_DMA_64BIT) { | |
1663 | ctl = b43_read32(dev, mmio_base + B43_DMA64_RXCTL); | |
1664 | ctl &= ~B43_DMA64_RXDIRECTFIFO; | |
1665 | if (enable) | |
1666 | ctl |= B43_DMA64_RXDIRECTFIFO; | |
1667 | b43_write32(dev, mmio_base + B43_DMA64_RXCTL, ctl); | |
1668 | } else { | |
1669 | ctl = b43_read32(dev, mmio_base + B43_DMA32_RXCTL); | |
1670 | ctl &= ~B43_DMA32_RXDIRECTFIFO; | |
1671 | if (enable) | |
1672 | ctl |= B43_DMA32_RXDIRECTFIFO; | |
1673 | b43_write32(dev, mmio_base + B43_DMA32_RXCTL, ctl); | |
1674 | } | |
1675 | } | |
1676 | ||
1677 | /* Enable/Disable Direct FIFO Receive Mode (PIO) on a RX engine. | |
1678 | * This is called from PIO code, so DMA structures are not available. */ | |
1679 | void b43_dma_direct_fifo_rx(struct b43_wldev *dev, | |
1680 | unsigned int engine_index, bool enable) | |
1681 | { | |
1682 | enum b43_dmatype type; | |
1683 | u16 mmio_base; | |
1684 | ||
1685 | type = dma_mask_to_engine_type(supported_dma_mask(dev)); | |
1686 | ||
1687 | mmio_base = b43_dmacontroller_base(type, engine_index); | |
1688 | direct_fifo_rx(dev, type, mmio_base, enable); | |
1689 | } | |
1690 | #endif /* CONFIG_B43_PIO */ |