Commit | Line | Data |
---|---|---|
e4d6b795 MB |
1 | /* |
2 | ||
3 | Broadcom B43 wireless driver | |
4 | ||
5 | DMA ringbuffer and descriptor allocation/management | |
6 | ||
eb032b98 | 7 | Copyright (c) 2005, 2006 Michael Buesch <m@bues.ch> |
e4d6b795 MB |
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> |
5a0e3ad6 | 41 | #include <linux/slab.h> |
57df40d2 | 42 | #include <asm/div64.h> |
280d0e16 | 43 | |
e4d6b795 | 44 | |
bdceeb2d MB |
45 | /* Required number of TX DMA slots per TX frame. |
46 | * This currently is 2, because we put the header and the ieee80211 frame | |
47 | * into separate slots. */ | |
48 | #define TX_SLOTS_PER_FRAME 2 | |
49 | ||
50 | ||
e4d6b795 MB |
51 | /* 32bit DMA ops. */ |
52 | static | |
53 | struct b43_dmadesc_generic *op32_idx2desc(struct b43_dmaring *ring, | |
54 | int slot, | |
55 | struct b43_dmadesc_meta **meta) | |
56 | { | |
57 | struct b43_dmadesc32 *desc; | |
58 | ||
59 | *meta = &(ring->meta[slot]); | |
60 | desc = ring->descbase; | |
61 | desc = &(desc[slot]); | |
62 | ||
63 | return (struct b43_dmadesc_generic *)desc; | |
64 | } | |
65 | ||
66 | static void op32_fill_descriptor(struct b43_dmaring *ring, | |
67 | struct b43_dmadesc_generic *desc, | |
68 | dma_addr_t dmaaddr, u16 bufsize, | |
69 | int start, int end, int irq) | |
70 | { | |
71 | struct b43_dmadesc32 *descbase = ring->descbase; | |
72 | int slot; | |
73 | u32 ctl; | |
74 | u32 addr; | |
75 | u32 addrext; | |
76 | ||
77 | slot = (int)(&(desc->dma32) - descbase); | |
78 | B43_WARN_ON(!(slot >= 0 && slot < ring->nr_slots)); | |
79 | ||
80 | addr = (u32) (dmaaddr & ~SSB_DMA_TRANSLATION_MASK); | |
81 | addrext = (u32) (dmaaddr & SSB_DMA_TRANSLATION_MASK) | |
82 | >> SSB_DMA_TRANSLATION_SHIFT; | |
05100a29 | 83 | addr |= ring->dev->dma.translation; |
8eccb53f | 84 | ctl = bufsize & B43_DMA32_DCTL_BYTECNT; |
e4d6b795 MB |
85 | if (slot == ring->nr_slots - 1) |
86 | ctl |= B43_DMA32_DCTL_DTABLEEND; | |
87 | if (start) | |
88 | ctl |= B43_DMA32_DCTL_FRAMESTART; | |
89 | if (end) | |
90 | ctl |= B43_DMA32_DCTL_FRAMEEND; | |
91 | if (irq) | |
92 | ctl |= B43_DMA32_DCTL_IRQ; | |
93 | ctl |= (addrext << B43_DMA32_DCTL_ADDREXT_SHIFT) | |
94 | & B43_DMA32_DCTL_ADDREXT_MASK; | |
95 | ||
96 | desc->dma32.control = cpu_to_le32(ctl); | |
97 | desc->dma32.address = cpu_to_le32(addr); | |
98 | } | |
99 | ||
100 | static void op32_poke_tx(struct b43_dmaring *ring, int slot) | |
101 | { | |
102 | b43_dma_write(ring, B43_DMA32_TXINDEX, | |
103 | (u32) (slot * sizeof(struct b43_dmadesc32))); | |
104 | } | |
105 | ||
106 | static void op32_tx_suspend(struct b43_dmaring *ring) | |
107 | { | |
108 | b43_dma_write(ring, B43_DMA32_TXCTL, b43_dma_read(ring, B43_DMA32_TXCTL) | |
109 | | B43_DMA32_TXSUSPEND); | |
110 | } | |
111 | ||
112 | static void op32_tx_resume(struct b43_dmaring *ring) | |
113 | { | |
114 | b43_dma_write(ring, B43_DMA32_TXCTL, b43_dma_read(ring, B43_DMA32_TXCTL) | |
115 | & ~B43_DMA32_TXSUSPEND); | |
116 | } | |
117 | ||
118 | static int op32_get_current_rxslot(struct b43_dmaring *ring) | |
119 | { | |
120 | u32 val; | |
121 | ||
122 | val = b43_dma_read(ring, B43_DMA32_RXSTATUS); | |
123 | val &= B43_DMA32_RXDPTR; | |
124 | ||
125 | return (val / sizeof(struct b43_dmadesc32)); | |
126 | } | |
127 | ||
128 | static void op32_set_current_rxslot(struct b43_dmaring *ring, int slot) | |
129 | { | |
130 | b43_dma_write(ring, B43_DMA32_RXINDEX, | |
131 | (u32) (slot * sizeof(struct b43_dmadesc32))); | |
132 | } | |
133 | ||
134 | static const struct b43_dma_ops dma32_ops = { | |
135 | .idx2desc = op32_idx2desc, | |
136 | .fill_descriptor = op32_fill_descriptor, | |
137 | .poke_tx = op32_poke_tx, | |
138 | .tx_suspend = op32_tx_suspend, | |
139 | .tx_resume = op32_tx_resume, | |
140 | .get_current_rxslot = op32_get_current_rxslot, | |
141 | .set_current_rxslot = op32_set_current_rxslot, | |
142 | }; | |
143 | ||
144 | /* 64bit DMA ops. */ | |
145 | static | |
146 | struct b43_dmadesc_generic *op64_idx2desc(struct b43_dmaring *ring, | |
147 | int slot, | |
148 | struct b43_dmadesc_meta **meta) | |
149 | { | |
150 | struct b43_dmadesc64 *desc; | |
151 | ||
152 | *meta = &(ring->meta[slot]); | |
153 | desc = ring->descbase; | |
154 | desc = &(desc[slot]); | |
155 | ||
156 | return (struct b43_dmadesc_generic *)desc; | |
157 | } | |
158 | ||
159 | static void op64_fill_descriptor(struct b43_dmaring *ring, | |
160 | struct b43_dmadesc_generic *desc, | |
161 | dma_addr_t dmaaddr, u16 bufsize, | |
162 | int start, int end, int irq) | |
163 | { | |
164 | struct b43_dmadesc64 *descbase = ring->descbase; | |
165 | int slot; | |
166 | u32 ctl0 = 0, ctl1 = 0; | |
167 | u32 addrlo, addrhi; | |
168 | u32 addrext; | |
169 | ||
170 | slot = (int)(&(desc->dma64) - descbase); | |
171 | B43_WARN_ON(!(slot >= 0 && slot < ring->nr_slots)); | |
172 | ||
173 | addrlo = (u32) (dmaaddr & 0xFFFFFFFF); | |
174 | addrhi = (((u64) dmaaddr >> 32) & ~SSB_DMA_TRANSLATION_MASK); | |
175 | addrext = (((u64) dmaaddr >> 32) & SSB_DMA_TRANSLATION_MASK) | |
176 | >> SSB_DMA_TRANSLATION_SHIFT; | |
a9770a81 | 177 | addrhi |= ring->dev->dma.translation; |
e4d6b795 MB |
178 | if (slot == ring->nr_slots - 1) |
179 | ctl0 |= B43_DMA64_DCTL0_DTABLEEND; | |
180 | if (start) | |
181 | ctl0 |= B43_DMA64_DCTL0_FRAMESTART; | |
182 | if (end) | |
183 | ctl0 |= B43_DMA64_DCTL0_FRAMEEND; | |
184 | if (irq) | |
185 | ctl0 |= B43_DMA64_DCTL0_IRQ; | |
8eccb53f | 186 | ctl1 |= bufsize & B43_DMA64_DCTL1_BYTECNT; |
e4d6b795 MB |
187 | ctl1 |= (addrext << B43_DMA64_DCTL1_ADDREXT_SHIFT) |
188 | & B43_DMA64_DCTL1_ADDREXT_MASK; | |
189 | ||
190 | desc->dma64.control0 = cpu_to_le32(ctl0); | |
191 | desc->dma64.control1 = cpu_to_le32(ctl1); | |
192 | desc->dma64.address_low = cpu_to_le32(addrlo); | |
193 | desc->dma64.address_high = cpu_to_le32(addrhi); | |
194 | } | |
195 | ||
196 | static void op64_poke_tx(struct b43_dmaring *ring, int slot) | |
197 | { | |
198 | b43_dma_write(ring, B43_DMA64_TXINDEX, | |
199 | (u32) (slot * sizeof(struct b43_dmadesc64))); | |
200 | } | |
201 | ||
202 | static void op64_tx_suspend(struct b43_dmaring *ring) | |
203 | { | |
204 | b43_dma_write(ring, B43_DMA64_TXCTL, b43_dma_read(ring, B43_DMA64_TXCTL) | |
205 | | B43_DMA64_TXSUSPEND); | |
206 | } | |
207 | ||
208 | static void op64_tx_resume(struct b43_dmaring *ring) | |
209 | { | |
210 | b43_dma_write(ring, B43_DMA64_TXCTL, b43_dma_read(ring, B43_DMA64_TXCTL) | |
211 | & ~B43_DMA64_TXSUSPEND); | |
212 | } | |
213 | ||
214 | static int op64_get_current_rxslot(struct b43_dmaring *ring) | |
215 | { | |
216 | u32 val; | |
217 | ||
218 | val = b43_dma_read(ring, B43_DMA64_RXSTATUS); | |
219 | val &= B43_DMA64_RXSTATDPTR; | |
220 | ||
221 | return (val / sizeof(struct b43_dmadesc64)); | |
222 | } | |
223 | ||
224 | static void op64_set_current_rxslot(struct b43_dmaring *ring, int slot) | |
225 | { | |
226 | b43_dma_write(ring, B43_DMA64_RXINDEX, | |
227 | (u32) (slot * sizeof(struct b43_dmadesc64))); | |
228 | } | |
229 | ||
230 | static const struct b43_dma_ops dma64_ops = { | |
231 | .idx2desc = op64_idx2desc, | |
232 | .fill_descriptor = op64_fill_descriptor, | |
233 | .poke_tx = op64_poke_tx, | |
234 | .tx_suspend = op64_tx_suspend, | |
235 | .tx_resume = op64_tx_resume, | |
236 | .get_current_rxslot = op64_get_current_rxslot, | |
237 | .set_current_rxslot = op64_set_current_rxslot, | |
238 | }; | |
239 | ||
240 | static inline int free_slots(struct b43_dmaring *ring) | |
241 | { | |
242 | return (ring->nr_slots - ring->used_slots); | |
243 | } | |
244 | ||
245 | static inline int next_slot(struct b43_dmaring *ring, int slot) | |
246 | { | |
247 | B43_WARN_ON(!(slot >= -1 && slot <= ring->nr_slots - 1)); | |
248 | if (slot == ring->nr_slots - 1) | |
249 | return 0; | |
250 | return slot + 1; | |
251 | } | |
252 | ||
253 | static inline int prev_slot(struct b43_dmaring *ring, int slot) | |
254 | { | |
255 | B43_WARN_ON(!(slot >= 0 && slot <= ring->nr_slots - 1)); | |
256 | if (slot == 0) | |
257 | return ring->nr_slots - 1; | |
258 | return slot - 1; | |
259 | } | |
260 | ||
261 | #ifdef CONFIG_B43_DEBUG | |
262 | static void update_max_used_slots(struct b43_dmaring *ring, | |
263 | int current_used_slots) | |
264 | { | |
265 | if (current_used_slots <= ring->max_used_slots) | |
266 | return; | |
267 | ring->max_used_slots = current_used_slots; | |
268 | if (b43_debug(ring->dev, B43_DBG_DMAVERBOSE)) { | |
269 | b43dbg(ring->dev->wl, | |
270 | "max_used_slots increased to %d on %s ring %d\n", | |
271 | ring->max_used_slots, | |
272 | ring->tx ? "TX" : "RX", ring->index); | |
273 | } | |
274 | } | |
275 | #else | |
276 | static inline | |
277 | void update_max_used_slots(struct b43_dmaring *ring, int current_used_slots) | |
278 | { | |
279 | } | |
280 | #endif /* DEBUG */ | |
281 | ||
282 | /* Request a slot for usage. */ | |
283 | static inline int request_slot(struct b43_dmaring *ring) | |
284 | { | |
285 | int slot; | |
286 | ||
287 | B43_WARN_ON(!ring->tx); | |
288 | B43_WARN_ON(ring->stopped); | |
289 | B43_WARN_ON(free_slots(ring) == 0); | |
290 | ||
291 | slot = next_slot(ring, ring->current_slot); | |
292 | ring->current_slot = slot; | |
293 | ring->used_slots++; | |
294 | ||
295 | update_max_used_slots(ring, ring->used_slots); | |
296 | ||
297 | return slot; | |
298 | } | |
299 | ||
b79caa68 | 300 | static u16 b43_dmacontroller_base(enum b43_dmatype type, int controller_idx) |
e4d6b795 MB |
301 | { |
302 | static const u16 map64[] = { | |
303 | B43_MMIO_DMA64_BASE0, | |
304 | B43_MMIO_DMA64_BASE1, | |
305 | B43_MMIO_DMA64_BASE2, | |
306 | B43_MMIO_DMA64_BASE3, | |
307 | B43_MMIO_DMA64_BASE4, | |
308 | B43_MMIO_DMA64_BASE5, | |
309 | }; | |
310 | static const u16 map32[] = { | |
311 | B43_MMIO_DMA32_BASE0, | |
312 | B43_MMIO_DMA32_BASE1, | |
313 | B43_MMIO_DMA32_BASE2, | |
314 | B43_MMIO_DMA32_BASE3, | |
315 | B43_MMIO_DMA32_BASE4, | |
316 | B43_MMIO_DMA32_BASE5, | |
317 | }; | |
318 | ||
b79caa68 | 319 | if (type == B43_DMA_64BIT) { |
e4d6b795 MB |
320 | B43_WARN_ON(!(controller_idx >= 0 && |
321 | controller_idx < ARRAY_SIZE(map64))); | |
322 | return map64[controller_idx]; | |
323 | } | |
324 | B43_WARN_ON(!(controller_idx >= 0 && | |
325 | controller_idx < ARRAY_SIZE(map32))); | |
326 | return map32[controller_idx]; | |
327 | } | |
328 | ||
329 | static inline | |
330 | dma_addr_t map_descbuffer(struct b43_dmaring *ring, | |
331 | unsigned char *buf, size_t len, int tx) | |
332 | { | |
333 | dma_addr_t dmaaddr; | |
334 | ||
335 | if (tx) { | |
a18c715e | 336 | dmaaddr = dma_map_single(ring->dev->dev->dma_dev, |
718e8898 | 337 | buf, len, DMA_TO_DEVICE); |
e4d6b795 | 338 | } else { |
a18c715e | 339 | dmaaddr = dma_map_single(ring->dev->dev->dma_dev, |
718e8898 | 340 | buf, len, DMA_FROM_DEVICE); |
e4d6b795 MB |
341 | } |
342 | ||
343 | return dmaaddr; | |
344 | } | |
345 | ||
346 | static inline | |
347 | void unmap_descbuffer(struct b43_dmaring *ring, | |
348 | dma_addr_t addr, size_t len, int tx) | |
349 | { | |
350 | if (tx) { | |
a18c715e | 351 | dma_unmap_single(ring->dev->dev->dma_dev, |
718e8898 | 352 | addr, len, DMA_TO_DEVICE); |
e4d6b795 | 353 | } else { |
a18c715e | 354 | dma_unmap_single(ring->dev->dev->dma_dev, |
718e8898 | 355 | addr, len, DMA_FROM_DEVICE); |
e4d6b795 MB |
356 | } |
357 | } | |
358 | ||
359 | static inline | |
360 | void sync_descbuffer_for_cpu(struct b43_dmaring *ring, | |
361 | dma_addr_t addr, size_t len) | |
362 | { | |
363 | B43_WARN_ON(ring->tx); | |
a18c715e | 364 | dma_sync_single_for_cpu(ring->dev->dev->dma_dev, |
f225763a | 365 | addr, len, DMA_FROM_DEVICE); |
e4d6b795 MB |
366 | } |
367 | ||
368 | static inline | |
369 | void sync_descbuffer_for_device(struct b43_dmaring *ring, | |
370 | dma_addr_t addr, size_t len) | |
371 | { | |
372 | B43_WARN_ON(ring->tx); | |
a18c715e | 373 | dma_sync_single_for_device(ring->dev->dev->dma_dev, |
718e8898 | 374 | addr, len, DMA_FROM_DEVICE); |
e4d6b795 MB |
375 | } |
376 | ||
377 | static inline | |
378 | void free_descriptor_buffer(struct b43_dmaring *ring, | |
379 | struct b43_dmadesc_meta *meta) | |
380 | { | |
381 | if (meta->skb) { | |
382 | dev_kfree_skb_any(meta->skb); | |
383 | meta->skb = NULL; | |
384 | } | |
385 | } | |
386 | ||
387 | static int alloc_ringmemory(struct b43_dmaring *ring) | |
388 | { | |
55afc80b JL |
389 | gfp_t flags = GFP_KERNEL; |
390 | ||
391 | /* The specs call for 4K buffers for 30- and 32-bit DMA with 4K | |
392 | * alignment and 8K buffers for 64-bit DMA with 8K alignment. Testing | |
393 | * has shown that 4K is sufficient for the latter as long as the buffer | |
394 | * does not cross an 8K boundary. | |
395 | * | |
396 | * For unknown reasons - possibly a hardware error - the BCM4311 rev | |
397 | * 02, which uses 64-bit DMA, needs the ring buffer in very low memory, | |
398 | * which accounts for the GFP_DMA flag below. | |
399 | * | |
400 | * The flags here must match the flags in free_ringmemory below! | |
013978b6 | 401 | */ |
b79caa68 | 402 | if (ring->type == B43_DMA_64BIT) |
55afc80b | 403 | flags |= GFP_DMA; |
a18c715e | 404 | ring->descbase = dma_alloc_coherent(ring->dev->dev->dma_dev, |
718e8898 FT |
405 | B43_DMA_RINGMEMSIZE, |
406 | &(ring->dmabase), flags); | |
55afc80b JL |
407 | if (!ring->descbase) { |
408 | b43err(ring->dev->wl, "DMA ringmemory allocation failed\n"); | |
9bd568a5 | 409 | return -ENOMEM; |
e4d6b795 | 410 | } |
55afc80b | 411 | memset(ring->descbase, 0, B43_DMA_RINGMEMSIZE); |
e4d6b795 MB |
412 | |
413 | return 0; | |
414 | } | |
415 | ||
416 | static void free_ringmemory(struct b43_dmaring *ring) | |
417 | { | |
a18c715e | 418 | dma_free_coherent(ring->dev->dev->dma_dev, B43_DMA_RINGMEMSIZE, |
718e8898 | 419 | ring->descbase, ring->dmabase); |
e4d6b795 MB |
420 | } |
421 | ||
422 | /* Reset the RX DMA channel */ | |
b79caa68 MB |
423 | static int b43_dmacontroller_rx_reset(struct b43_wldev *dev, u16 mmio_base, |
424 | enum b43_dmatype type) | |
e4d6b795 MB |
425 | { |
426 | int i; | |
427 | u32 value; | |
428 | u16 offset; | |
429 | ||
430 | might_sleep(); | |
431 | ||
b79caa68 | 432 | offset = (type == B43_DMA_64BIT) ? B43_DMA64_RXCTL : B43_DMA32_RXCTL; |
e4d6b795 MB |
433 | b43_write32(dev, mmio_base + offset, 0); |
434 | for (i = 0; i < 10; i++) { | |
b79caa68 MB |
435 | offset = (type == B43_DMA_64BIT) ? B43_DMA64_RXSTATUS : |
436 | B43_DMA32_RXSTATUS; | |
e4d6b795 | 437 | value = b43_read32(dev, mmio_base + offset); |
b79caa68 | 438 | if (type == B43_DMA_64BIT) { |
e4d6b795 MB |
439 | value &= B43_DMA64_RXSTAT; |
440 | if (value == B43_DMA64_RXSTAT_DISABLED) { | |
441 | i = -1; | |
442 | break; | |
443 | } | |
444 | } else { | |
445 | value &= B43_DMA32_RXSTATE; | |
446 | if (value == B43_DMA32_RXSTAT_DISABLED) { | |
447 | i = -1; | |
448 | break; | |
449 | } | |
450 | } | |
451 | msleep(1); | |
452 | } | |
453 | if (i != -1) { | |
454 | b43err(dev->wl, "DMA RX reset timed out\n"); | |
455 | return -ENODEV; | |
456 | } | |
457 | ||
458 | return 0; | |
459 | } | |
460 | ||
013978b6 | 461 | /* Reset the TX DMA channel */ |
b79caa68 MB |
462 | static int b43_dmacontroller_tx_reset(struct b43_wldev *dev, u16 mmio_base, |
463 | enum b43_dmatype type) | |
e4d6b795 MB |
464 | { |
465 | int i; | |
466 | u32 value; | |
467 | u16 offset; | |
468 | ||
469 | might_sleep(); | |
470 | ||
471 | for (i = 0; i < 10; i++) { | |
b79caa68 MB |
472 | offset = (type == B43_DMA_64BIT) ? B43_DMA64_TXSTATUS : |
473 | B43_DMA32_TXSTATUS; | |
e4d6b795 | 474 | value = b43_read32(dev, mmio_base + offset); |
b79caa68 | 475 | if (type == B43_DMA_64BIT) { |
e4d6b795 MB |
476 | value &= B43_DMA64_TXSTAT; |
477 | if (value == B43_DMA64_TXSTAT_DISABLED || | |
478 | value == B43_DMA64_TXSTAT_IDLEWAIT || | |
479 | value == B43_DMA64_TXSTAT_STOPPED) | |
480 | break; | |
481 | } else { | |
482 | value &= B43_DMA32_TXSTATE; | |
483 | if (value == B43_DMA32_TXSTAT_DISABLED || | |
484 | value == B43_DMA32_TXSTAT_IDLEWAIT || | |
485 | value == B43_DMA32_TXSTAT_STOPPED) | |
486 | break; | |
487 | } | |
488 | msleep(1); | |
489 | } | |
b79caa68 | 490 | offset = (type == B43_DMA_64BIT) ? B43_DMA64_TXCTL : B43_DMA32_TXCTL; |
e4d6b795 MB |
491 | b43_write32(dev, mmio_base + offset, 0); |
492 | for (i = 0; i < 10; i++) { | |
b79caa68 MB |
493 | offset = (type == B43_DMA_64BIT) ? B43_DMA64_TXSTATUS : |
494 | B43_DMA32_TXSTATUS; | |
e4d6b795 | 495 | value = b43_read32(dev, mmio_base + offset); |
b79caa68 | 496 | if (type == B43_DMA_64BIT) { |
e4d6b795 MB |
497 | value &= B43_DMA64_TXSTAT; |
498 | if (value == B43_DMA64_TXSTAT_DISABLED) { | |
499 | i = -1; | |
500 | break; | |
501 | } | |
502 | } else { | |
503 | value &= B43_DMA32_TXSTATE; | |
504 | if (value == B43_DMA32_TXSTAT_DISABLED) { | |
505 | i = -1; | |
506 | break; | |
507 | } | |
508 | } | |
509 | msleep(1); | |
510 | } | |
511 | if (i != -1) { | |
512 | b43err(dev->wl, "DMA TX reset timed out\n"); | |
513 | return -ENODEV; | |
514 | } | |
515 | /* ensure the reset is completed. */ | |
516 | msleep(1); | |
517 | ||
518 | return 0; | |
519 | } | |
520 | ||
b79caa68 MB |
521 | /* Check if a DMA mapping address is invalid. */ |
522 | static bool b43_dma_mapping_error(struct b43_dmaring *ring, | |
523 | dma_addr_t addr, | |
ffa9256a | 524 | size_t buffersize, bool dma_to_device) |
b79caa68 | 525 | { |
a18c715e | 526 | if (unlikely(dma_mapping_error(ring->dev->dev->dma_dev, addr))) |
b79caa68 MB |
527 | return 1; |
528 | ||
55afc80b JL |
529 | switch (ring->type) { |
530 | case B43_DMA_30BIT: | |
531 | if ((u64)addr + buffersize > (1ULL << 30)) | |
532 | goto address_error; | |
533 | break; | |
534 | case B43_DMA_32BIT: | |
535 | if ((u64)addr + buffersize > (1ULL << 32)) | |
536 | goto address_error; | |
537 | break; | |
538 | case B43_DMA_64BIT: | |
539 | /* Currently we can't have addresses beyond | |
540 | * 64bit in the kernel. */ | |
541 | break; | |
b79caa68 MB |
542 | } |
543 | ||
544 | /* The address is OK. */ | |
545 | return 0; | |
55afc80b JL |
546 | |
547 | address_error: | |
548 | /* We can't support this address. Unmap it again. */ | |
549 | unmap_descbuffer(ring, addr, buffersize, dma_to_device); | |
550 | ||
551 | return 1; | |
b79caa68 MB |
552 | } |
553 | ||
ec9a1d8c MB |
554 | static bool b43_rx_buffer_is_poisoned(struct b43_dmaring *ring, struct sk_buff *skb) |
555 | { | |
556 | unsigned char *f = skb->data + ring->frameoffset; | |
557 | ||
558 | return ((f[0] & f[1] & f[2] & f[3] & f[4] & f[5] & f[6] & f[7]) == 0xFF); | |
559 | } | |
560 | ||
561 | static void b43_poison_rx_buffer(struct b43_dmaring *ring, struct sk_buff *skb) | |
562 | { | |
563 | struct b43_rxhdr_fw4 *rxhdr; | |
564 | unsigned char *frame; | |
565 | ||
566 | /* This poisons the RX buffer to detect DMA failures. */ | |
567 | ||
568 | rxhdr = (struct b43_rxhdr_fw4 *)(skb->data); | |
569 | rxhdr->frame_len = 0; | |
570 | ||
571 | B43_WARN_ON(ring->rx_buffersize < ring->frameoffset + sizeof(struct b43_plcp_hdr6) + 2); | |
572 | frame = skb->data + ring->frameoffset; | |
573 | memset(frame, 0xFF, sizeof(struct b43_plcp_hdr6) + 2 /* padding */); | |
574 | } | |
575 | ||
e4d6b795 MB |
576 | static int setup_rx_descbuffer(struct b43_dmaring *ring, |
577 | struct b43_dmadesc_generic *desc, | |
578 | struct b43_dmadesc_meta *meta, gfp_t gfp_flags) | |
579 | { | |
e4d6b795 MB |
580 | dma_addr_t dmaaddr; |
581 | struct sk_buff *skb; | |
582 | ||
583 | B43_WARN_ON(ring->tx); | |
584 | ||
585 | skb = __dev_alloc_skb(ring->rx_buffersize, gfp_flags); | |
586 | if (unlikely(!skb)) | |
587 | return -ENOMEM; | |
ec9a1d8c | 588 | b43_poison_rx_buffer(ring, skb); |
e4d6b795 | 589 | dmaaddr = map_descbuffer(ring, skb->data, ring->rx_buffersize, 0); |
ffa9256a | 590 | if (b43_dma_mapping_error(ring, dmaaddr, ring->rx_buffersize, 0)) { |
e4d6b795 MB |
591 | /* ugh. try to realloc in zone_dma */ |
592 | gfp_flags |= GFP_DMA; | |
593 | ||
594 | dev_kfree_skb_any(skb); | |
595 | ||
596 | skb = __dev_alloc_skb(ring->rx_buffersize, gfp_flags); | |
597 | if (unlikely(!skb)) | |
598 | return -ENOMEM; | |
ec9a1d8c | 599 | b43_poison_rx_buffer(ring, skb); |
e4d6b795 MB |
600 | dmaaddr = map_descbuffer(ring, skb->data, |
601 | ring->rx_buffersize, 0); | |
bdceeb2d MB |
602 | if (b43_dma_mapping_error(ring, dmaaddr, ring->rx_buffersize, 0)) { |
603 | b43err(ring->dev->wl, "RX DMA buffer allocation failed\n"); | |
604 | dev_kfree_skb_any(skb); | |
605 | return -EIO; | |
606 | } | |
e4d6b795 MB |
607 | } |
608 | ||
609 | meta->skb = skb; | |
610 | meta->dmaaddr = dmaaddr; | |
611 | ring->ops->fill_descriptor(ring, desc, dmaaddr, | |
612 | ring->rx_buffersize, 0, 0, 0); | |
613 | ||
e4d6b795 MB |
614 | return 0; |
615 | } | |
616 | ||
617 | /* Allocate the initial descbuffers. | |
618 | * This is used for an RX ring only. | |
619 | */ | |
620 | static int alloc_initial_descbuffers(struct b43_dmaring *ring) | |
621 | { | |
622 | int i, err = -ENOMEM; | |
623 | struct b43_dmadesc_generic *desc; | |
624 | struct b43_dmadesc_meta *meta; | |
625 | ||
626 | for (i = 0; i < ring->nr_slots; i++) { | |
627 | desc = ring->ops->idx2desc(ring, i, &meta); | |
628 | ||
629 | err = setup_rx_descbuffer(ring, desc, meta, GFP_KERNEL); | |
630 | if (err) { | |
631 | b43err(ring->dev->wl, | |
632 | "Failed to allocate initial descbuffers\n"); | |
633 | goto err_unwind; | |
634 | } | |
635 | } | |
636 | mb(); | |
637 | ring->used_slots = ring->nr_slots; | |
638 | err = 0; | |
639 | out: | |
640 | return err; | |
641 | ||
642 | err_unwind: | |
643 | for (i--; i >= 0; i--) { | |
644 | desc = ring->ops->idx2desc(ring, i, &meta); | |
645 | ||
646 | unmap_descbuffer(ring, meta->dmaaddr, ring->rx_buffersize, 0); | |
647 | dev_kfree_skb(meta->skb); | |
648 | } | |
649 | goto out; | |
650 | } | |
651 | ||
652 | /* Do initial setup of the DMA controller. | |
653 | * Reset the controller, write the ring busaddress | |
654 | * and switch the "enable" bit on. | |
655 | */ | |
656 | static int dmacontroller_setup(struct b43_dmaring *ring) | |
657 | { | |
658 | int err = 0; | |
659 | u32 value; | |
660 | u32 addrext; | |
05100a29 | 661 | u32 trans = ring->dev->dma.translation; |
78c1ee7e | 662 | bool parity = ring->dev->dma.parity; |
e4d6b795 MB |
663 | |
664 | if (ring->tx) { | |
b79caa68 | 665 | if (ring->type == B43_DMA_64BIT) { |
e4d6b795 MB |
666 | u64 ringbase = (u64) (ring->dmabase); |
667 | ||
668 | addrext = ((ringbase >> 32) & SSB_DMA_TRANSLATION_MASK) | |
669 | >> SSB_DMA_TRANSLATION_SHIFT; | |
670 | value = B43_DMA64_TXENABLE; | |
671 | value |= (addrext << B43_DMA64_TXADDREXT_SHIFT) | |
672 | & B43_DMA64_TXADDREXT_MASK; | |
78c1ee7e RM |
673 | if (!parity) |
674 | value |= B43_DMA64_TXPARITYDISABLE; | |
e4d6b795 MB |
675 | b43_dma_write(ring, B43_DMA64_TXCTL, value); |
676 | b43_dma_write(ring, B43_DMA64_TXRINGLO, | |
677 | (ringbase & 0xFFFFFFFF)); | |
678 | b43_dma_write(ring, B43_DMA64_TXRINGHI, | |
679 | ((ringbase >> 32) & | |
680 | ~SSB_DMA_TRANSLATION_MASK) | |
a9770a81 | 681 | | trans); |
e4d6b795 MB |
682 | } else { |
683 | u32 ringbase = (u32) (ring->dmabase); | |
684 | ||
685 | addrext = (ringbase & SSB_DMA_TRANSLATION_MASK) | |
686 | >> SSB_DMA_TRANSLATION_SHIFT; | |
687 | value = B43_DMA32_TXENABLE; | |
688 | value |= (addrext << B43_DMA32_TXADDREXT_SHIFT) | |
689 | & B43_DMA32_TXADDREXT_MASK; | |
78c1ee7e RM |
690 | if (!parity) |
691 | value |= B43_DMA32_TXPARITYDISABLE; | |
e4d6b795 MB |
692 | b43_dma_write(ring, B43_DMA32_TXCTL, value); |
693 | b43_dma_write(ring, B43_DMA32_TXRING, | |
694 | (ringbase & ~SSB_DMA_TRANSLATION_MASK) | |
695 | | trans); | |
696 | } | |
697 | } else { | |
698 | err = alloc_initial_descbuffers(ring); | |
699 | if (err) | |
700 | goto out; | |
b79caa68 | 701 | if (ring->type == B43_DMA_64BIT) { |
e4d6b795 MB |
702 | u64 ringbase = (u64) (ring->dmabase); |
703 | ||
704 | addrext = ((ringbase >> 32) & SSB_DMA_TRANSLATION_MASK) | |
705 | >> SSB_DMA_TRANSLATION_SHIFT; | |
706 | value = (ring->frameoffset << B43_DMA64_RXFROFF_SHIFT); | |
707 | value |= B43_DMA64_RXENABLE; | |
708 | value |= (addrext << B43_DMA64_RXADDREXT_SHIFT) | |
709 | & B43_DMA64_RXADDREXT_MASK; | |
78c1ee7e RM |
710 | if (!parity) |
711 | value |= B43_DMA64_RXPARITYDISABLE; | |
e4d6b795 MB |
712 | b43_dma_write(ring, B43_DMA64_RXCTL, value); |
713 | b43_dma_write(ring, B43_DMA64_RXRINGLO, | |
714 | (ringbase & 0xFFFFFFFF)); | |
715 | b43_dma_write(ring, B43_DMA64_RXRINGHI, | |
716 | ((ringbase >> 32) & | |
717 | ~SSB_DMA_TRANSLATION_MASK) | |
a9770a81 | 718 | | trans); |
013978b6 LF |
719 | b43_dma_write(ring, B43_DMA64_RXINDEX, ring->nr_slots * |
720 | sizeof(struct b43_dmadesc64)); | |
e4d6b795 MB |
721 | } else { |
722 | u32 ringbase = (u32) (ring->dmabase); | |
723 | ||
724 | addrext = (ringbase & SSB_DMA_TRANSLATION_MASK) | |
725 | >> SSB_DMA_TRANSLATION_SHIFT; | |
726 | value = (ring->frameoffset << B43_DMA32_RXFROFF_SHIFT); | |
727 | value |= B43_DMA32_RXENABLE; | |
728 | value |= (addrext << B43_DMA32_RXADDREXT_SHIFT) | |
729 | & B43_DMA32_RXADDREXT_MASK; | |
78c1ee7e RM |
730 | if (!parity) |
731 | value |= B43_DMA32_RXPARITYDISABLE; | |
e4d6b795 MB |
732 | b43_dma_write(ring, B43_DMA32_RXCTL, value); |
733 | b43_dma_write(ring, B43_DMA32_RXRING, | |
734 | (ringbase & ~SSB_DMA_TRANSLATION_MASK) | |
735 | | trans); | |
013978b6 LF |
736 | b43_dma_write(ring, B43_DMA32_RXINDEX, ring->nr_slots * |
737 | sizeof(struct b43_dmadesc32)); | |
e4d6b795 MB |
738 | } |
739 | } | |
740 | ||
013978b6 | 741 | out: |
e4d6b795 MB |
742 | return err; |
743 | } | |
744 | ||
745 | /* Shutdown the DMA controller. */ | |
746 | static void dmacontroller_cleanup(struct b43_dmaring *ring) | |
747 | { | |
748 | if (ring->tx) { | |
749 | b43_dmacontroller_tx_reset(ring->dev, ring->mmio_base, | |
b79caa68 MB |
750 | ring->type); |
751 | if (ring->type == B43_DMA_64BIT) { | |
e4d6b795 MB |
752 | b43_dma_write(ring, B43_DMA64_TXRINGLO, 0); |
753 | b43_dma_write(ring, B43_DMA64_TXRINGHI, 0); | |
754 | } else | |
755 | b43_dma_write(ring, B43_DMA32_TXRING, 0); | |
756 | } else { | |
757 | b43_dmacontroller_rx_reset(ring->dev, ring->mmio_base, | |
b79caa68 MB |
758 | ring->type); |
759 | if (ring->type == B43_DMA_64BIT) { | |
e4d6b795 MB |
760 | b43_dma_write(ring, B43_DMA64_RXRINGLO, 0); |
761 | b43_dma_write(ring, B43_DMA64_RXRINGHI, 0); | |
762 | } else | |
763 | b43_dma_write(ring, B43_DMA32_RXRING, 0); | |
764 | } | |
765 | } | |
766 | ||
767 | static void free_all_descbuffers(struct b43_dmaring *ring) | |
768 | { | |
e4d6b795 MB |
769 | struct b43_dmadesc_meta *meta; |
770 | int i; | |
771 | ||
772 | if (!ring->used_slots) | |
773 | return; | |
774 | for (i = 0; i < ring->nr_slots; i++) { | |
9c1cacd2 LF |
775 | /* get meta - ignore returned value */ |
776 | ring->ops->idx2desc(ring, i, &meta); | |
e4d6b795 | 777 | |
07681e21 | 778 | if (!meta->skb || b43_dma_ptr_is_poisoned(meta->skb)) { |
e4d6b795 MB |
779 | B43_WARN_ON(!ring->tx); |
780 | continue; | |
781 | } | |
782 | if (ring->tx) { | |
783 | unmap_descbuffer(ring, meta->dmaaddr, | |
784 | meta->skb->len, 1); | |
785 | } else { | |
786 | unmap_descbuffer(ring, meta->dmaaddr, | |
787 | ring->rx_buffersize, 0); | |
788 | } | |
789 | free_descriptor_buffer(ring, meta); | |
790 | } | |
791 | } | |
792 | ||
793 | static u64 supported_dma_mask(struct b43_wldev *dev) | |
794 | { | |
795 | u32 tmp; | |
796 | u16 mmio_base; | |
797 | ||
798 | tmp = b43_read32(dev, SSB_TMSHIGH); | |
799 | if (tmp & SSB_TMSHIGH_DMA64) | |
6a35528a | 800 | return DMA_BIT_MASK(64); |
e4d6b795 MB |
801 | mmio_base = b43_dmacontroller_base(0, 0); |
802 | b43_write32(dev, mmio_base + B43_DMA32_TXCTL, B43_DMA32_TXADDREXT_MASK); | |
803 | tmp = b43_read32(dev, mmio_base + B43_DMA32_TXCTL); | |
804 | if (tmp & B43_DMA32_TXADDREXT_MASK) | |
284901a9 | 805 | return DMA_BIT_MASK(32); |
e4d6b795 | 806 | |
28b76796 | 807 | return DMA_BIT_MASK(30); |
e4d6b795 MB |
808 | } |
809 | ||
5100d5ac MB |
810 | static enum b43_dmatype dma_mask_to_engine_type(u64 dmamask) |
811 | { | |
28b76796 | 812 | if (dmamask == DMA_BIT_MASK(30)) |
5100d5ac | 813 | return B43_DMA_30BIT; |
284901a9 | 814 | if (dmamask == DMA_BIT_MASK(32)) |
5100d5ac | 815 | return B43_DMA_32BIT; |
6a35528a | 816 | if (dmamask == DMA_BIT_MASK(64)) |
5100d5ac MB |
817 | return B43_DMA_64BIT; |
818 | B43_WARN_ON(1); | |
819 | return B43_DMA_30BIT; | |
820 | } | |
821 | ||
e4d6b795 MB |
822 | /* Main initialization function. */ |
823 | static | |
824 | struct b43_dmaring *b43_setup_dmaring(struct b43_wldev *dev, | |
825 | int controller_index, | |
b79caa68 MB |
826 | int for_tx, |
827 | enum b43_dmatype type) | |
e4d6b795 MB |
828 | { |
829 | struct b43_dmaring *ring; | |
07681e21 | 830 | int i, err; |
e4d6b795 MB |
831 | dma_addr_t dma_test; |
832 | ||
833 | ring = kzalloc(sizeof(*ring), GFP_KERNEL); | |
834 | if (!ring) | |
835 | goto out; | |
836 | ||
028118a5 | 837 | ring->nr_slots = B43_RXRING_SLOTS; |
e4d6b795 | 838 | if (for_tx) |
028118a5 | 839 | ring->nr_slots = B43_TXRING_SLOTS; |
e4d6b795 | 840 | |
028118a5 | 841 | ring->meta = kcalloc(ring->nr_slots, sizeof(struct b43_dmadesc_meta), |
e4d6b795 MB |
842 | GFP_KERNEL); |
843 | if (!ring->meta) | |
844 | goto err_kfree_ring; | |
07681e21 MB |
845 | for (i = 0; i < ring->nr_slots; i++) |
846 | ring->meta->skb = B43_DMA_PTR_POISON; | |
028118a5 MB |
847 | |
848 | ring->type = type; | |
849 | ring->dev = dev; | |
850 | ring->mmio_base = b43_dmacontroller_base(type, controller_index); | |
851 | ring->index = controller_index; | |
852 | if (type == B43_DMA_64BIT) | |
853 | ring->ops = &dma64_ops; | |
854 | else | |
855 | ring->ops = &dma32_ops; | |
e4d6b795 | 856 | if (for_tx) { |
028118a5 MB |
857 | ring->tx = 1; |
858 | ring->current_slot = -1; | |
859 | } else { | |
860 | if (ring->index == 0) { | |
861 | ring->rx_buffersize = B43_DMA0_RX_BUFFERSIZE; | |
862 | ring->frameoffset = B43_DMA0_RX_FRAMEOFFSET; | |
028118a5 MB |
863 | } else |
864 | B43_WARN_ON(1); | |
865 | } | |
028118a5 MB |
866 | #ifdef CONFIG_B43_DEBUG |
867 | ring->last_injected_overflow = jiffies; | |
868 | #endif | |
869 | ||
870 | if (for_tx) { | |
2d071ca5 MB |
871 | /* Assumption: B43_TXRING_SLOTS can be divided by TX_SLOTS_PER_FRAME */ |
872 | BUILD_BUG_ON(B43_TXRING_SLOTS % TX_SLOTS_PER_FRAME != 0); | |
873 | ||
bdceeb2d | 874 | ring->txhdr_cache = kcalloc(ring->nr_slots / TX_SLOTS_PER_FRAME, |
eb189d8b | 875 | b43_txhdr_size(dev), |
e4d6b795 MB |
876 | GFP_KERNEL); |
877 | if (!ring->txhdr_cache) | |
878 | goto err_kfree_meta; | |
879 | ||
880 | /* test for ability to dma to txhdr_cache */ | |
a18c715e | 881 | dma_test = dma_map_single(dev->dev->dma_dev, |
718e8898 FT |
882 | ring->txhdr_cache, |
883 | b43_txhdr_size(dev), | |
884 | DMA_TO_DEVICE); | |
e4d6b795 | 885 | |
ffa9256a MB |
886 | if (b43_dma_mapping_error(ring, dma_test, |
887 | b43_txhdr_size(dev), 1)) { | |
e4d6b795 MB |
888 | /* ugh realloc */ |
889 | kfree(ring->txhdr_cache); | |
bdceeb2d | 890 | ring->txhdr_cache = kcalloc(ring->nr_slots / TX_SLOTS_PER_FRAME, |
eb189d8b | 891 | b43_txhdr_size(dev), |
e4d6b795 MB |
892 | GFP_KERNEL | GFP_DMA); |
893 | if (!ring->txhdr_cache) | |
894 | goto err_kfree_meta; | |
895 | ||
a18c715e | 896 | dma_test = dma_map_single(dev->dev->dma_dev, |
718e8898 FT |
897 | ring->txhdr_cache, |
898 | b43_txhdr_size(dev), | |
899 | DMA_TO_DEVICE); | |
e4d6b795 | 900 | |
b79caa68 | 901 | if (b43_dma_mapping_error(ring, dma_test, |
539e6f8c MB |
902 | b43_txhdr_size(dev), 1)) { |
903 | ||
904 | b43err(dev->wl, | |
905 | "TXHDR DMA allocation failed\n"); | |
e4d6b795 | 906 | goto err_kfree_txhdr_cache; |
539e6f8c | 907 | } |
e4d6b795 MB |
908 | } |
909 | ||
a18c715e | 910 | dma_unmap_single(dev->dev->dma_dev, |
718e8898 FT |
911 | dma_test, b43_txhdr_size(dev), |
912 | DMA_TO_DEVICE); | |
e4d6b795 MB |
913 | } |
914 | ||
e4d6b795 MB |
915 | err = alloc_ringmemory(ring); |
916 | if (err) | |
917 | goto err_kfree_txhdr_cache; | |
918 | err = dmacontroller_setup(ring); | |
919 | if (err) | |
920 | goto err_free_ringmemory; | |
921 | ||
922 | out: | |
923 | return ring; | |
924 | ||
925 | err_free_ringmemory: | |
926 | free_ringmemory(ring); | |
927 | err_kfree_txhdr_cache: | |
928 | kfree(ring->txhdr_cache); | |
929 | err_kfree_meta: | |
930 | kfree(ring->meta); | |
931 | err_kfree_ring: | |
932 | kfree(ring); | |
933 | ring = NULL; | |
934 | goto out; | |
935 | } | |
936 | ||
57df40d2 MB |
937 | #define divide(a, b) ({ \ |
938 | typeof(a) __a = a; \ | |
939 | do_div(__a, b); \ | |
940 | __a; \ | |
941 | }) | |
942 | ||
943 | #define modulo(a, b) ({ \ | |
944 | typeof(a) __a = a; \ | |
945 | do_div(__a, b); \ | |
946 | }) | |
947 | ||
e4d6b795 | 948 | /* Main cleanup function. */ |
b27faf8e MB |
949 | static void b43_destroy_dmaring(struct b43_dmaring *ring, |
950 | const char *ringname) | |
e4d6b795 MB |
951 | { |
952 | if (!ring) | |
953 | return; | |
954 | ||
57df40d2 MB |
955 | #ifdef CONFIG_B43_DEBUG |
956 | { | |
957 | /* Print some statistics. */ | |
958 | u64 failed_packets = ring->nr_failed_tx_packets; | |
959 | u64 succeed_packets = ring->nr_succeed_tx_packets; | |
960 | u64 nr_packets = failed_packets + succeed_packets; | |
961 | u64 permille_failed = 0, average_tries = 0; | |
962 | ||
963 | if (nr_packets) | |
964 | permille_failed = divide(failed_packets * 1000, nr_packets); | |
965 | if (nr_packets) | |
966 | average_tries = divide(ring->nr_total_packet_tries * 100, nr_packets); | |
967 | ||
968 | b43dbg(ring->dev->wl, "DMA-%u %s: " | |
969 | "Used slots %d/%d, Failed frames %llu/%llu = %llu.%01llu%%, " | |
970 | "Average tries %llu.%02llu\n", | |
971 | (unsigned int)(ring->type), ringname, | |
972 | ring->max_used_slots, | |
973 | ring->nr_slots, | |
974 | (unsigned long long)failed_packets, | |
87d96114 | 975 | (unsigned long long)nr_packets, |
57df40d2 MB |
976 | (unsigned long long)divide(permille_failed, 10), |
977 | (unsigned long long)modulo(permille_failed, 10), | |
978 | (unsigned long long)divide(average_tries, 100), | |
979 | (unsigned long long)modulo(average_tries, 100)); | |
980 | } | |
981 | #endif /* DEBUG */ | |
982 | ||
e4d6b795 MB |
983 | /* Device IRQs are disabled prior entering this function, |
984 | * so no need to take care of concurrency with rx handler stuff. | |
985 | */ | |
986 | dmacontroller_cleanup(ring); | |
987 | free_all_descbuffers(ring); | |
988 | free_ringmemory(ring); | |
989 | ||
990 | kfree(ring->txhdr_cache); | |
991 | kfree(ring->meta); | |
992 | kfree(ring); | |
993 | } | |
994 | ||
b27faf8e MB |
995 | #define destroy_ring(dma, ring) do { \ |
996 | b43_destroy_dmaring((dma)->ring, __stringify(ring)); \ | |
997 | (dma)->ring = NULL; \ | |
998 | } while (0) | |
999 | ||
e4d6b795 MB |
1000 | void b43_dma_free(struct b43_wldev *dev) |
1001 | { | |
5100d5ac MB |
1002 | struct b43_dma *dma; |
1003 | ||
1004 | if (b43_using_pio_transfers(dev)) | |
1005 | return; | |
1006 | dma = &dev->dma; | |
e4d6b795 | 1007 | |
b27faf8e MB |
1008 | destroy_ring(dma, rx_ring); |
1009 | destroy_ring(dma, tx_ring_AC_BK); | |
1010 | destroy_ring(dma, tx_ring_AC_BE); | |
1011 | destroy_ring(dma, tx_ring_AC_VI); | |
1012 | destroy_ring(dma, tx_ring_AC_VO); | |
1013 | destroy_ring(dma, tx_ring_mcast); | |
e4d6b795 MB |
1014 | } |
1015 | ||
1033b3ea MB |
1016 | static int b43_dma_set_mask(struct b43_wldev *dev, u64 mask) |
1017 | { | |
1018 | u64 orig_mask = mask; | |
1019 | bool fallback = 0; | |
1020 | int err; | |
1021 | ||
1022 | /* Try to set the DMA mask. If it fails, try falling back to a | |
1023 | * lower mask, as we can always also support a lower one. */ | |
1024 | while (1) { | |
a18c715e | 1025 | err = dma_set_mask(dev->dev->dma_dev, mask); |
718e8898 | 1026 | if (!err) { |
a18c715e | 1027 | err = dma_set_coherent_mask(dev->dev->dma_dev, mask); |
718e8898 FT |
1028 | if (!err) |
1029 | break; | |
1030 | } | |
6a35528a | 1031 | if (mask == DMA_BIT_MASK(64)) { |
284901a9 | 1032 | mask = DMA_BIT_MASK(32); |
1033b3ea MB |
1033 | fallback = 1; |
1034 | continue; | |
1035 | } | |
284901a9 | 1036 | if (mask == DMA_BIT_MASK(32)) { |
28b76796 | 1037 | mask = DMA_BIT_MASK(30); |
1033b3ea MB |
1038 | fallback = 1; |
1039 | continue; | |
1040 | } | |
1041 | b43err(dev->wl, "The machine/kernel does not support " | |
1042 | "the required %u-bit DMA mask\n", | |
1043 | (unsigned int)dma_mask_to_engine_type(orig_mask)); | |
1044 | return -EOPNOTSUPP; | |
1045 | } | |
1046 | if (fallback) { | |
1047 | b43info(dev->wl, "DMA mask fallback from %u-bit to %u-bit\n", | |
1048 | (unsigned int)dma_mask_to_engine_type(orig_mask), | |
1049 | (unsigned int)dma_mask_to_engine_type(mask)); | |
1050 | } | |
1051 | ||
1052 | return 0; | |
1053 | } | |
1054 | ||
e4d6b795 MB |
1055 | int b43_dma_init(struct b43_wldev *dev) |
1056 | { | |
1057 | struct b43_dma *dma = &dev->dma; | |
e4d6b795 MB |
1058 | int err; |
1059 | u64 dmamask; | |
b79caa68 | 1060 | enum b43_dmatype type; |
e4d6b795 MB |
1061 | |
1062 | dmamask = supported_dma_mask(dev); | |
5100d5ac | 1063 | type = dma_mask_to_engine_type(dmamask); |
1033b3ea MB |
1064 | err = b43_dma_set_mask(dev, dmamask); |
1065 | if (err) | |
1066 | return err; | |
6cbab0d9 RM |
1067 | |
1068 | switch (dev->dev->bus_type) { | |
eb90e9e8 RM |
1069 | #ifdef CONFIG_B43_BCMA |
1070 | case B43_BUS_BCMA: | |
1071 | dma->translation = bcma_core_dma_translation(dev->dev->bdev); | |
1072 | break; | |
1073 | #endif | |
6cbab0d9 RM |
1074 | #ifdef CONFIG_B43_SSB |
1075 | case B43_BUS_SSB: | |
1076 | dma->translation = ssb_dma_translation(dev->dev->sdev); | |
1077 | break; | |
1078 | #endif | |
1079 | } | |
e4d6b795 | 1080 | |
78c1ee7e RM |
1081 | dma->parity = true; |
1082 | #ifdef CONFIG_B43_BCMA | |
1083 | /* TODO: find out which SSB devices need disabling parity */ | |
1084 | if (dev->dev->bus_type == B43_BUS_BCMA) | |
1085 | dma->parity = false; | |
1086 | #endif | |
1087 | ||
e4d6b795 MB |
1088 | err = -ENOMEM; |
1089 | /* setup TX DMA channels. */ | |
b27faf8e MB |
1090 | dma->tx_ring_AC_BK = b43_setup_dmaring(dev, 0, 1, type); |
1091 | if (!dma->tx_ring_AC_BK) | |
e4d6b795 | 1092 | goto out; |
e4d6b795 | 1093 | |
b27faf8e MB |
1094 | dma->tx_ring_AC_BE = b43_setup_dmaring(dev, 1, 1, type); |
1095 | if (!dma->tx_ring_AC_BE) | |
1096 | goto err_destroy_bk; | |
e4d6b795 | 1097 | |
b27faf8e MB |
1098 | dma->tx_ring_AC_VI = b43_setup_dmaring(dev, 2, 1, type); |
1099 | if (!dma->tx_ring_AC_VI) | |
1100 | goto err_destroy_be; | |
e4d6b795 | 1101 | |
b27faf8e MB |
1102 | dma->tx_ring_AC_VO = b43_setup_dmaring(dev, 3, 1, type); |
1103 | if (!dma->tx_ring_AC_VO) | |
1104 | goto err_destroy_vi; | |
e4d6b795 | 1105 | |
b27faf8e MB |
1106 | dma->tx_ring_mcast = b43_setup_dmaring(dev, 4, 1, type); |
1107 | if (!dma->tx_ring_mcast) | |
1108 | goto err_destroy_vo; | |
e4d6b795 | 1109 | |
b27faf8e MB |
1110 | /* setup RX DMA channel. */ |
1111 | dma->rx_ring = b43_setup_dmaring(dev, 0, 0, type); | |
1112 | if (!dma->rx_ring) | |
1113 | goto err_destroy_mcast; | |
e4d6b795 | 1114 | |
b27faf8e | 1115 | /* No support for the TX status DMA ring. */ |
21d889d4 | 1116 | B43_WARN_ON(dev->dev->core_rev < 5); |
e4d6b795 | 1117 | |
b79caa68 MB |
1118 | b43dbg(dev->wl, "%u-bit DMA initialized\n", |
1119 | (unsigned int)type); | |
e4d6b795 | 1120 | err = 0; |
b27faf8e | 1121 | out: |
e4d6b795 MB |
1122 | return err; |
1123 | ||
b27faf8e MB |
1124 | err_destroy_mcast: |
1125 | destroy_ring(dma, tx_ring_mcast); | |
1126 | err_destroy_vo: | |
1127 | destroy_ring(dma, tx_ring_AC_VO); | |
1128 | err_destroy_vi: | |
1129 | destroy_ring(dma, tx_ring_AC_VI); | |
1130 | err_destroy_be: | |
1131 | destroy_ring(dma, tx_ring_AC_BE); | |
1132 | err_destroy_bk: | |
1133 | destroy_ring(dma, tx_ring_AC_BK); | |
1134 | return err; | |
e4d6b795 MB |
1135 | } |
1136 | ||
1137 | /* Generate a cookie for the TX header. */ | |
1138 | static u16 generate_cookie(struct b43_dmaring *ring, int slot) | |
1139 | { | |
b27faf8e | 1140 | u16 cookie; |
e4d6b795 MB |
1141 | |
1142 | /* Use the upper 4 bits of the cookie as | |
1143 | * DMA controller ID and store the slot number | |
1144 | * in the lower 12 bits. | |
1145 | * Note that the cookie must never be 0, as this | |
1146 | * is a special value used in RX path. | |
280d0e16 MB |
1147 | * It can also not be 0xFFFF because that is special |
1148 | * for multicast frames. | |
e4d6b795 | 1149 | */ |
b27faf8e | 1150 | cookie = (((u16)ring->index + 1) << 12); |
e4d6b795 | 1151 | B43_WARN_ON(slot & ~0x0FFF); |
b27faf8e | 1152 | cookie |= (u16)slot; |
e4d6b795 MB |
1153 | |
1154 | return cookie; | |
1155 | } | |
1156 | ||
1157 | /* Inspect a cookie and find out to which controller/slot it belongs. */ | |
1158 | static | |
1159 | struct b43_dmaring *parse_cookie(struct b43_wldev *dev, u16 cookie, int *slot) | |
1160 | { | |
1161 | struct b43_dma *dma = &dev->dma; | |
1162 | struct b43_dmaring *ring = NULL; | |
1163 | ||
1164 | switch (cookie & 0xF000) { | |
280d0e16 | 1165 | case 0x1000: |
b27faf8e | 1166 | ring = dma->tx_ring_AC_BK; |
e4d6b795 | 1167 | break; |
280d0e16 | 1168 | case 0x2000: |
b27faf8e | 1169 | ring = dma->tx_ring_AC_BE; |
e4d6b795 | 1170 | break; |
280d0e16 | 1171 | case 0x3000: |
b27faf8e | 1172 | ring = dma->tx_ring_AC_VI; |
e4d6b795 | 1173 | break; |
280d0e16 | 1174 | case 0x4000: |
b27faf8e | 1175 | ring = dma->tx_ring_AC_VO; |
e4d6b795 | 1176 | break; |
280d0e16 | 1177 | case 0x5000: |
b27faf8e | 1178 | ring = dma->tx_ring_mcast; |
e4d6b795 | 1179 | break; |
e4d6b795 MB |
1180 | } |
1181 | *slot = (cookie & 0x0FFF); | |
07681e21 MB |
1182 | if (unlikely(!ring || *slot < 0 || *slot >= ring->nr_slots)) { |
1183 | b43dbg(dev->wl, "TX-status contains " | |
1184 | "invalid cookie: 0x%04X\n", cookie); | |
1185 | return NULL; | |
1186 | } | |
e4d6b795 MB |
1187 | |
1188 | return ring; | |
1189 | } | |
1190 | ||
1191 | static int dma_tx_fragment(struct b43_dmaring *ring, | |
f54a5202 | 1192 | struct sk_buff *skb) |
e4d6b795 MB |
1193 | { |
1194 | const struct b43_dma_ops *ops = ring->ops; | |
e039fa4a | 1195 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
f54a5202 | 1196 | struct b43_private_tx_info *priv_info = b43_get_priv_tx_info(info); |
e4d6b795 | 1197 | u8 *header; |
09552ccd | 1198 | int slot, old_top_slot, old_used_slots; |
e4d6b795 MB |
1199 | int err; |
1200 | struct b43_dmadesc_generic *desc; | |
1201 | struct b43_dmadesc_meta *meta; | |
1202 | struct b43_dmadesc_meta *meta_hdr; | |
280d0e16 | 1203 | u16 cookie; |
eb189d8b | 1204 | size_t hdrsize = b43_txhdr_size(ring->dev); |
e4d6b795 | 1205 | |
bdceeb2d MB |
1206 | /* Important note: If the number of used DMA slots per TX frame |
1207 | * is changed here, the TX_SLOTS_PER_FRAME definition at the top of | |
1208 | * the file has to be updated, too! | |
1209 | */ | |
e4d6b795 | 1210 | |
09552ccd MB |
1211 | old_top_slot = ring->current_slot; |
1212 | old_used_slots = ring->used_slots; | |
1213 | ||
e4d6b795 MB |
1214 | /* Get a slot for the header. */ |
1215 | slot = request_slot(ring); | |
1216 | desc = ops->idx2desc(ring, slot, &meta_hdr); | |
1217 | memset(meta_hdr, 0, sizeof(*meta_hdr)); | |
1218 | ||
bdceeb2d | 1219 | header = &(ring->txhdr_cache[(slot / TX_SLOTS_PER_FRAME) * hdrsize]); |
280d0e16 | 1220 | cookie = generate_cookie(ring, slot); |
09552ccd | 1221 | err = b43_generate_txhdr(ring->dev, header, |
035d0243 | 1222 | skb, info, cookie); |
09552ccd MB |
1223 | if (unlikely(err)) { |
1224 | ring->current_slot = old_top_slot; | |
1225 | ring->used_slots = old_used_slots; | |
1226 | return err; | |
1227 | } | |
e4d6b795 MB |
1228 | |
1229 | meta_hdr->dmaaddr = map_descbuffer(ring, (unsigned char *)header, | |
eb189d8b | 1230 | hdrsize, 1); |
ffa9256a | 1231 | if (b43_dma_mapping_error(ring, meta_hdr->dmaaddr, hdrsize, 1)) { |
09552ccd MB |
1232 | ring->current_slot = old_top_slot; |
1233 | ring->used_slots = old_used_slots; | |
e4d6b795 | 1234 | return -EIO; |
09552ccd | 1235 | } |
e4d6b795 | 1236 | ops->fill_descriptor(ring, desc, meta_hdr->dmaaddr, |
eb189d8b | 1237 | hdrsize, 1, 0, 0); |
e4d6b795 MB |
1238 | |
1239 | /* Get a slot for the payload. */ | |
1240 | slot = request_slot(ring); | |
1241 | desc = ops->idx2desc(ring, slot, &meta); | |
1242 | memset(meta, 0, sizeof(*meta)); | |
1243 | ||
e4d6b795 MB |
1244 | meta->skb = skb; |
1245 | meta->is_last_fragment = 1; | |
f54a5202 | 1246 | priv_info->bouncebuffer = NULL; |
e4d6b795 MB |
1247 | |
1248 | meta->dmaaddr = map_descbuffer(ring, skb->data, skb->len, 1); | |
1249 | /* create a bounce buffer in zone_dma on mapping failure. */ | |
ffa9256a | 1250 | if (b43_dma_mapping_error(ring, meta->dmaaddr, skb->len, 1)) { |
a61aac7c JL |
1251 | priv_info->bouncebuffer = kmemdup(skb->data, skb->len, |
1252 | GFP_ATOMIC | GFP_DMA); | |
f54a5202 | 1253 | if (!priv_info->bouncebuffer) { |
09552ccd MB |
1254 | ring->current_slot = old_top_slot; |
1255 | ring->used_slots = old_used_slots; | |
e4d6b795 MB |
1256 | err = -ENOMEM; |
1257 | goto out_unmap_hdr; | |
1258 | } | |
1259 | ||
f54a5202 | 1260 | meta->dmaaddr = map_descbuffer(ring, priv_info->bouncebuffer, skb->len, 1); |
ffa9256a | 1261 | if (b43_dma_mapping_error(ring, meta->dmaaddr, skb->len, 1)) { |
f54a5202 MB |
1262 | kfree(priv_info->bouncebuffer); |
1263 | priv_info->bouncebuffer = NULL; | |
09552ccd MB |
1264 | ring->current_slot = old_top_slot; |
1265 | ring->used_slots = old_used_slots; | |
e4d6b795 | 1266 | err = -EIO; |
f54a5202 | 1267 | goto out_unmap_hdr; |
e4d6b795 MB |
1268 | } |
1269 | } | |
1270 | ||
1271 | ops->fill_descriptor(ring, desc, meta->dmaaddr, skb->len, 0, 1, 1); | |
1272 | ||
e039fa4a | 1273 | if (info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) { |
280d0e16 MB |
1274 | /* Tell the firmware about the cookie of the last |
1275 | * mcast frame, so it can clear the more-data bit in it. */ | |
1276 | b43_shm_write16(ring->dev, B43_SHM_SHARED, | |
1277 | B43_SHM_SH_MCASTCOOKIE, cookie); | |
1278 | } | |
e4d6b795 MB |
1279 | /* Now transfer the whole frame. */ |
1280 | wmb(); | |
1281 | ops->poke_tx(ring, next_slot(ring, slot)); | |
1282 | return 0; | |
1283 | ||
280d0e16 | 1284 | out_unmap_hdr: |
e4d6b795 | 1285 | unmap_descbuffer(ring, meta_hdr->dmaaddr, |
eb189d8b | 1286 | hdrsize, 1); |
e4d6b795 MB |
1287 | return err; |
1288 | } | |
1289 | ||
1290 | static inline int should_inject_overflow(struct b43_dmaring *ring) | |
1291 | { | |
1292 | #ifdef CONFIG_B43_DEBUG | |
1293 | if (unlikely(b43_debug(ring->dev, B43_DBG_DMAOVERFLOW))) { | |
1294 | /* Check if we should inject another ringbuffer overflow | |
1295 | * to test handling of this situation in the stack. */ | |
1296 | unsigned long next_overflow; | |
1297 | ||
1298 | next_overflow = ring->last_injected_overflow + HZ; | |
1299 | if (time_after(jiffies, next_overflow)) { | |
1300 | ring->last_injected_overflow = jiffies; | |
1301 | b43dbg(ring->dev->wl, | |
1302 | "Injecting TX ring overflow on " | |
1303 | "DMA controller %d\n", ring->index); | |
1304 | return 1; | |
1305 | } | |
1306 | } | |
1307 | #endif /* CONFIG_B43_DEBUG */ | |
1308 | return 0; | |
1309 | } | |
1310 | ||
e6f5b934 | 1311 | /* Static mapping of mac80211's queues (priorities) to b43 DMA rings. */ |
99da185a JD |
1312 | static struct b43_dmaring *select_ring_by_priority(struct b43_wldev *dev, |
1313 | u8 queue_prio) | |
e6f5b934 MB |
1314 | { |
1315 | struct b43_dmaring *ring; | |
1316 | ||
403a3a13 | 1317 | if (dev->qos_enabled) { |
e6f5b934 MB |
1318 | /* 0 = highest priority */ |
1319 | switch (queue_prio) { | |
1320 | default: | |
1321 | B43_WARN_ON(1); | |
1322 | /* fallthrough */ | |
1323 | case 0: | |
b27faf8e | 1324 | ring = dev->dma.tx_ring_AC_VO; |
e6f5b934 MB |
1325 | break; |
1326 | case 1: | |
b27faf8e | 1327 | ring = dev->dma.tx_ring_AC_VI; |
e6f5b934 MB |
1328 | break; |
1329 | case 2: | |
b27faf8e | 1330 | ring = dev->dma.tx_ring_AC_BE; |
e6f5b934 MB |
1331 | break; |
1332 | case 3: | |
b27faf8e | 1333 | ring = dev->dma.tx_ring_AC_BK; |
e6f5b934 MB |
1334 | break; |
1335 | } | |
1336 | } else | |
b27faf8e | 1337 | ring = dev->dma.tx_ring_AC_BE; |
e6f5b934 MB |
1338 | |
1339 | return ring; | |
1340 | } | |
1341 | ||
e039fa4a | 1342 | int b43_dma_tx(struct b43_wldev *dev, struct sk_buff *skb) |
e4d6b795 MB |
1343 | { |
1344 | struct b43_dmaring *ring; | |
280d0e16 | 1345 | struct ieee80211_hdr *hdr; |
e4d6b795 | 1346 | int err = 0; |
e039fa4a | 1347 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
e4d6b795 | 1348 | |
280d0e16 | 1349 | hdr = (struct ieee80211_hdr *)skb->data; |
e039fa4a | 1350 | if (info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) { |
280d0e16 | 1351 | /* The multicast ring will be sent after the DTIM */ |
b27faf8e | 1352 | ring = dev->dma.tx_ring_mcast; |
280d0e16 MB |
1353 | /* Set the more-data bit. Ucode will clear it on |
1354 | * the last frame for us. */ | |
1355 | hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA); | |
1356 | } else { | |
1357 | /* Decide by priority where to put this frame. */ | |
e2530083 JB |
1358 | ring = select_ring_by_priority( |
1359 | dev, skb_get_queue_mapping(skb)); | |
280d0e16 MB |
1360 | } |
1361 | ||
e4d6b795 | 1362 | B43_WARN_ON(!ring->tx); |
ca2d559e | 1363 | |
18c69510 LF |
1364 | if (unlikely(ring->stopped)) { |
1365 | /* We get here only because of a bug in mac80211. | |
1366 | * Because of a race, one packet may be queued after | |
1367 | * the queue is stopped, thus we got called when we shouldn't. | |
1368 | * For now, just refuse the transmit. */ | |
1369 | if (b43_debug(dev, B43_DBG_DMAVERBOSE)) | |
1370 | b43err(dev->wl, "Packet after queue stopped\n"); | |
1371 | err = -ENOSPC; | |
637dae3f | 1372 | goto out; |
18c69510 LF |
1373 | } |
1374 | ||
1375 | if (unlikely(WARN_ON(free_slots(ring) < TX_SLOTS_PER_FRAME))) { | |
1376 | /* If we get here, we have a real error with the queue | |
1377 | * full, but queues not stopped. */ | |
1378 | b43err(dev->wl, "DMA queue overflow\n"); | |
e4d6b795 | 1379 | err = -ENOSPC; |
637dae3f | 1380 | goto out; |
e4d6b795 | 1381 | } |
e4d6b795 | 1382 | |
e6f5b934 MB |
1383 | /* Assign the queue number to the ring (if not already done before) |
1384 | * so TX status handling can use it. The queue to ring mapping is | |
1385 | * static, so we don't need to store it per frame. */ | |
e2530083 | 1386 | ring->queue_prio = skb_get_queue_mapping(skb); |
e6f5b934 | 1387 | |
f54a5202 | 1388 | err = dma_tx_fragment(ring, skb); |
09552ccd MB |
1389 | if (unlikely(err == -ENOKEY)) { |
1390 | /* Drop this packet, as we don't have the encryption key | |
1391 | * anymore and must not transmit it unencrypted. */ | |
1392 | dev_kfree_skb_any(skb); | |
1393 | err = 0; | |
637dae3f | 1394 | goto out; |
09552ccd | 1395 | } |
e4d6b795 MB |
1396 | if (unlikely(err)) { |
1397 | b43err(dev->wl, "DMA tx mapping failure\n"); | |
637dae3f | 1398 | goto out; |
e4d6b795 | 1399 | } |
bdceeb2d | 1400 | if ((free_slots(ring) < TX_SLOTS_PER_FRAME) || |
e4d6b795 MB |
1401 | should_inject_overflow(ring)) { |
1402 | /* This TX ring is full. */ | |
e2530083 | 1403 | ieee80211_stop_queue(dev->wl->hw, skb_get_queue_mapping(skb)); |
e4d6b795 MB |
1404 | ring->stopped = 1; |
1405 | if (b43_debug(dev, B43_DBG_DMAVERBOSE)) { | |
1406 | b43dbg(dev->wl, "Stopped TX ring %d\n", ring->index); | |
1407 | } | |
1408 | } | |
637dae3f | 1409 | out: |
e4d6b795 MB |
1410 | |
1411 | return err; | |
1412 | } | |
1413 | ||
1414 | void b43_dma_handle_txstatus(struct b43_wldev *dev, | |
1415 | const struct b43_txstatus *status) | |
1416 | { | |
1417 | const struct b43_dma_ops *ops; | |
1418 | struct b43_dmaring *ring; | |
e4d6b795 | 1419 | struct b43_dmadesc_meta *meta; |
07681e21 | 1420 | int slot, firstused; |
5100d5ac | 1421 | bool frame_succeed; |
e4d6b795 MB |
1422 | |
1423 | ring = parse_cookie(dev, status->cookie, &slot); | |
1424 | if (unlikely(!ring)) | |
1425 | return; | |
e4d6b795 | 1426 | B43_WARN_ON(!ring->tx); |
07681e21 MB |
1427 | |
1428 | /* Sanity check: TX packets are processed in-order on one ring. | |
1429 | * Check if the slot deduced from the cookie really is the first | |
1430 | * used slot. */ | |
1431 | firstused = ring->current_slot - ring->used_slots + 1; | |
1432 | if (firstused < 0) | |
1433 | firstused = ring->nr_slots + firstused; | |
1434 | if (unlikely(slot != firstused)) { | |
1435 | /* This possibly is a firmware bug and will result in | |
1436 | * malfunction, memory leaks and/or stall of DMA functionality. */ | |
1437 | b43dbg(dev->wl, "Out of order TX status report on DMA ring %d. " | |
1438 | "Expected %d, but got %d\n", | |
1439 | ring->index, firstused, slot); | |
1440 | return; | |
1441 | } | |
1442 | ||
e4d6b795 MB |
1443 | ops = ring->ops; |
1444 | while (1) { | |
07681e21 | 1445 | B43_WARN_ON(slot < 0 || slot >= ring->nr_slots); |
9c1cacd2 LF |
1446 | /* get meta - ignore returned value */ |
1447 | ops->idx2desc(ring, slot, &meta); | |
e4d6b795 | 1448 | |
07681e21 MB |
1449 | if (b43_dma_ptr_is_poisoned(meta->skb)) { |
1450 | b43dbg(dev->wl, "Poisoned TX slot %d (first=%d) " | |
1451 | "on ring %d\n", | |
1452 | slot, firstused, ring->index); | |
1453 | break; | |
1454 | } | |
f54a5202 MB |
1455 | if (meta->skb) { |
1456 | struct b43_private_tx_info *priv_info = | |
1457 | b43_get_priv_tx_info(IEEE80211_SKB_CB(meta->skb)); | |
1458 | ||
1459 | unmap_descbuffer(ring, meta->dmaaddr, meta->skb->len, 1); | |
1460 | kfree(priv_info->bouncebuffer); | |
1461 | priv_info->bouncebuffer = NULL; | |
1462 | } else { | |
e4d6b795 | 1463 | unmap_descbuffer(ring, meta->dmaaddr, |
eb189d8b | 1464 | b43_txhdr_size(dev), 1); |
f54a5202 | 1465 | } |
e4d6b795 MB |
1466 | |
1467 | if (meta->is_last_fragment) { | |
e039fa4a JB |
1468 | struct ieee80211_tx_info *info; |
1469 | ||
07681e21 MB |
1470 | if (unlikely(!meta->skb)) { |
1471 | /* This is a scatter-gather fragment of a frame, so | |
1472 | * the skb pointer must not be NULL. */ | |
1473 | b43dbg(dev->wl, "TX status unexpected NULL skb " | |
1474 | "at slot %d (first=%d) on ring %d\n", | |
1475 | slot, firstused, ring->index); | |
1476 | break; | |
1477 | } | |
e039fa4a JB |
1478 | |
1479 | info = IEEE80211_SKB_CB(meta->skb); | |
1480 | ||
e039fa4a JB |
1481 | /* |
1482 | * Call back to inform the ieee80211 subsystem about | |
1483 | * the status of the transmission. | |
e4d6b795 | 1484 | */ |
e6a9854b | 1485 | frame_succeed = b43_fill_txstatus_report(dev, info, status); |
5100d5ac MB |
1486 | #ifdef CONFIG_B43_DEBUG |
1487 | if (frame_succeed) | |
1488 | ring->nr_succeed_tx_packets++; | |
1489 | else | |
1490 | ring->nr_failed_tx_packets++; | |
1491 | ring->nr_total_packet_tries += status->frame_count; | |
1492 | #endif /* DEBUG */ | |
ce6c4a13 | 1493 | ieee80211_tx_status(dev->wl->hw, meta->skb); |
e039fa4a | 1494 | |
07681e21 MB |
1495 | /* skb will be freed by ieee80211_tx_status(). |
1496 | * Poison our pointer. */ | |
1497 | meta->skb = B43_DMA_PTR_POISON; | |
e4d6b795 MB |
1498 | } else { |
1499 | /* No need to call free_descriptor_buffer here, as | |
1500 | * this is only the txhdr, which is not allocated. | |
1501 | */ | |
07681e21 MB |
1502 | if (unlikely(meta->skb)) { |
1503 | b43dbg(dev->wl, "TX status unexpected non-NULL skb " | |
1504 | "at slot %d (first=%d) on ring %d\n", | |
1505 | slot, firstused, ring->index); | |
1506 | break; | |
1507 | } | |
e4d6b795 MB |
1508 | } |
1509 | ||
1510 | /* Everything unmapped and free'd. So it's not used anymore. */ | |
1511 | ring->used_slots--; | |
1512 | ||
07681e21 MB |
1513 | if (meta->is_last_fragment) { |
1514 | /* This is the last scatter-gather | |
1515 | * fragment of the frame. We are done. */ | |
e4d6b795 | 1516 | break; |
07681e21 | 1517 | } |
e4d6b795 MB |
1518 | slot = next_slot(ring, slot); |
1519 | } | |
e4d6b795 | 1520 | if (ring->stopped) { |
bdceeb2d | 1521 | B43_WARN_ON(free_slots(ring) < TX_SLOTS_PER_FRAME); |
e6f5b934 | 1522 | ieee80211_wake_queue(dev->wl->hw, ring->queue_prio); |
e4d6b795 MB |
1523 | ring->stopped = 0; |
1524 | if (b43_debug(dev, B43_DBG_DMAVERBOSE)) { | |
1525 | b43dbg(dev->wl, "Woke up TX ring %d\n", ring->index); | |
1526 | } | |
1527 | } | |
e4d6b795 MB |
1528 | } |
1529 | ||
e4d6b795 MB |
1530 | static void dma_rx(struct b43_dmaring *ring, int *slot) |
1531 | { | |
1532 | const struct b43_dma_ops *ops = ring->ops; | |
1533 | struct b43_dmadesc_generic *desc; | |
1534 | struct b43_dmadesc_meta *meta; | |
1535 | struct b43_rxhdr_fw4 *rxhdr; | |
1536 | struct sk_buff *skb; | |
1537 | u16 len; | |
1538 | int err; | |
1539 | dma_addr_t dmaaddr; | |
1540 | ||
1541 | desc = ops->idx2desc(ring, *slot, &meta); | |
1542 | ||
1543 | sync_descbuffer_for_cpu(ring, meta->dmaaddr, ring->rx_buffersize); | |
1544 | skb = meta->skb; | |
1545 | ||
e4d6b795 MB |
1546 | rxhdr = (struct b43_rxhdr_fw4 *)skb->data; |
1547 | len = le16_to_cpu(rxhdr->frame_len); | |
1548 | if (len == 0) { | |
1549 | int i = 0; | |
1550 | ||
1551 | do { | |
1552 | udelay(2); | |
1553 | barrier(); | |
1554 | len = le16_to_cpu(rxhdr->frame_len); | |
1555 | } while (len == 0 && i++ < 5); | |
1556 | if (unlikely(len == 0)) { | |
cf68636a MB |
1557 | dmaaddr = meta->dmaaddr; |
1558 | goto drop_recycle_buffer; | |
e4d6b795 MB |
1559 | } |
1560 | } | |
ec9a1d8c MB |
1561 | if (unlikely(b43_rx_buffer_is_poisoned(ring, skb))) { |
1562 | /* Something went wrong with the DMA. | |
1563 | * The device did not touch the buffer and did not overwrite the poison. */ | |
1564 | b43dbg(ring->dev->wl, "DMA RX: Dropping poisoned buffer.\n"); | |
cf68636a MB |
1565 | dmaaddr = meta->dmaaddr; |
1566 | goto drop_recycle_buffer; | |
ec9a1d8c | 1567 | } |
c85ce65e | 1568 | if (unlikely(len + ring->frameoffset > ring->rx_buffersize)) { |
e4d6b795 MB |
1569 | /* The data did not fit into one descriptor buffer |
1570 | * and is split over multiple buffers. | |
1571 | * This should never happen, as we try to allocate buffers | |
1572 | * big enough. So simply ignore this packet. | |
1573 | */ | |
1574 | int cnt = 0; | |
1575 | s32 tmp = len; | |
1576 | ||
1577 | while (1) { | |
1578 | desc = ops->idx2desc(ring, *slot, &meta); | |
1579 | /* recycle the descriptor buffer. */ | |
cf68636a | 1580 | b43_poison_rx_buffer(ring, meta->skb); |
e4d6b795 MB |
1581 | sync_descbuffer_for_device(ring, meta->dmaaddr, |
1582 | ring->rx_buffersize); | |
1583 | *slot = next_slot(ring, *slot); | |
1584 | cnt++; | |
1585 | tmp -= ring->rx_buffersize; | |
1586 | if (tmp <= 0) | |
1587 | break; | |
1588 | } | |
1589 | b43err(ring->dev->wl, "DMA RX buffer too small " | |
1590 | "(len: %u, buffer: %u, nr-dropped: %d)\n", | |
1591 | len, ring->rx_buffersize, cnt); | |
1592 | goto drop; | |
1593 | } | |
1594 | ||
1595 | dmaaddr = meta->dmaaddr; | |
1596 | err = setup_rx_descbuffer(ring, desc, meta, GFP_ATOMIC); | |
1597 | if (unlikely(err)) { | |
1598 | b43dbg(ring->dev->wl, "DMA RX: setup_rx_descbuffer() failed\n"); | |
cf68636a | 1599 | goto drop_recycle_buffer; |
e4d6b795 MB |
1600 | } |
1601 | ||
1602 | unmap_descbuffer(ring, dmaaddr, ring->rx_buffersize, 0); | |
1603 | skb_put(skb, len + ring->frameoffset); | |
1604 | skb_pull(skb, ring->frameoffset); | |
1605 | ||
1606 | b43_rx(ring->dev, skb, rxhdr); | |
b27faf8e | 1607 | drop: |
e4d6b795 | 1608 | return; |
cf68636a MB |
1609 | |
1610 | drop_recycle_buffer: | |
1611 | /* Poison and recycle the RX buffer. */ | |
1612 | b43_poison_rx_buffer(ring, skb); | |
1613 | sync_descbuffer_for_device(ring, dmaaddr, ring->rx_buffersize); | |
e4d6b795 MB |
1614 | } |
1615 | ||
1616 | void b43_dma_rx(struct b43_dmaring *ring) | |
1617 | { | |
1618 | const struct b43_dma_ops *ops = ring->ops; | |
1619 | int slot, current_slot; | |
1620 | int used_slots = 0; | |
1621 | ||
1622 | B43_WARN_ON(ring->tx); | |
1623 | current_slot = ops->get_current_rxslot(ring); | |
1624 | B43_WARN_ON(!(current_slot >= 0 && current_slot < ring->nr_slots)); | |
1625 | ||
1626 | slot = ring->current_slot; | |
1627 | for (; slot != current_slot; slot = next_slot(ring, slot)) { | |
1628 | dma_rx(ring, &slot); | |
1629 | update_max_used_slots(ring, ++used_slots); | |
1630 | } | |
73e6cdcf | 1631 | wmb(); |
e4d6b795 MB |
1632 | ops->set_current_rxslot(ring, slot); |
1633 | ring->current_slot = slot; | |
1634 | } | |
1635 | ||
1636 | static void b43_dma_tx_suspend_ring(struct b43_dmaring *ring) | |
1637 | { | |
e4d6b795 MB |
1638 | B43_WARN_ON(!ring->tx); |
1639 | ring->ops->tx_suspend(ring); | |
e4d6b795 MB |
1640 | } |
1641 | ||
1642 | static void b43_dma_tx_resume_ring(struct b43_dmaring *ring) | |
1643 | { | |
e4d6b795 MB |
1644 | B43_WARN_ON(!ring->tx); |
1645 | ring->ops->tx_resume(ring); | |
e4d6b795 MB |
1646 | } |
1647 | ||
1648 | void b43_dma_tx_suspend(struct b43_wldev *dev) | |
1649 | { | |
1650 | b43_power_saving_ctl_bits(dev, B43_PS_AWAKE); | |
b27faf8e MB |
1651 | b43_dma_tx_suspend_ring(dev->dma.tx_ring_AC_BK); |
1652 | b43_dma_tx_suspend_ring(dev->dma.tx_ring_AC_BE); | |
1653 | b43_dma_tx_suspend_ring(dev->dma.tx_ring_AC_VI); | |
1654 | b43_dma_tx_suspend_ring(dev->dma.tx_ring_AC_VO); | |
1655 | b43_dma_tx_suspend_ring(dev->dma.tx_ring_mcast); | |
e4d6b795 MB |
1656 | } |
1657 | ||
1658 | void b43_dma_tx_resume(struct b43_wldev *dev) | |
1659 | { | |
b27faf8e MB |
1660 | b43_dma_tx_resume_ring(dev->dma.tx_ring_mcast); |
1661 | b43_dma_tx_resume_ring(dev->dma.tx_ring_AC_VO); | |
1662 | b43_dma_tx_resume_ring(dev->dma.tx_ring_AC_VI); | |
1663 | b43_dma_tx_resume_ring(dev->dma.tx_ring_AC_BE); | |
1664 | b43_dma_tx_resume_ring(dev->dma.tx_ring_AC_BK); | |
e4d6b795 MB |
1665 | b43_power_saving_ctl_bits(dev, 0); |
1666 | } | |
5100d5ac | 1667 | |
5100d5ac MB |
1668 | static void direct_fifo_rx(struct b43_wldev *dev, enum b43_dmatype type, |
1669 | u16 mmio_base, bool enable) | |
1670 | { | |
1671 | u32 ctl; | |
1672 | ||
1673 | if (type == B43_DMA_64BIT) { | |
1674 | ctl = b43_read32(dev, mmio_base + B43_DMA64_RXCTL); | |
1675 | ctl &= ~B43_DMA64_RXDIRECTFIFO; | |
1676 | if (enable) | |
1677 | ctl |= B43_DMA64_RXDIRECTFIFO; | |
1678 | b43_write32(dev, mmio_base + B43_DMA64_RXCTL, ctl); | |
1679 | } else { | |
1680 | ctl = b43_read32(dev, mmio_base + B43_DMA32_RXCTL); | |
1681 | ctl &= ~B43_DMA32_RXDIRECTFIFO; | |
1682 | if (enable) | |
1683 | ctl |= B43_DMA32_RXDIRECTFIFO; | |
1684 | b43_write32(dev, mmio_base + B43_DMA32_RXCTL, ctl); | |
1685 | } | |
1686 | } | |
1687 | ||
1688 | /* Enable/Disable Direct FIFO Receive Mode (PIO) on a RX engine. | |
1689 | * This is called from PIO code, so DMA structures are not available. */ | |
1690 | void b43_dma_direct_fifo_rx(struct b43_wldev *dev, | |
1691 | unsigned int engine_index, bool enable) | |
1692 | { | |
1693 | enum b43_dmatype type; | |
1694 | u16 mmio_base; | |
1695 | ||
1696 | type = dma_mask_to_engine_type(supported_dma_mask(dev)); | |
1697 | ||
1698 | mmio_base = b43_dmacontroller_base(type, engine_index); | |
1699 | direct_fifo_rx(dev, type, mmio_base, enable); | |
1700 | } |