Commit | Line | Data |
---|---|---|
f222313a JL |
1 | /* |
2 | ||
3 | Broadcom BCM43xx wireless driver | |
4 | ||
5 | DMA ringbuffer and descriptor allocation/management | |
6 | ||
9218e02b | 7 | Copyright (c) 2005, 2006 Michael Buesch <mbuesch@freenet.de> |
f222313a JL |
8 | |
9 | Some code in this file is derived from the b44.c driver | |
10 | Copyright (C) 2002 David S. Miller | |
11 | Copyright (C) Pekka Pietikainen | |
12 | ||
13 | This program is free software; you can redistribute it and/or modify | |
14 | it under the terms of the GNU General Public License as published by | |
15 | the Free Software Foundation; either version 2 of the License, or | |
16 | (at your option) any later version. | |
17 | ||
18 | This program is distributed in the hope that it will be useful, | |
19 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
20 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
21 | GNU General Public License for more details. | |
22 | ||
23 | You should have received a copy of the GNU General Public License | |
24 | along with this program; see the file COPYING. If not, write to | |
25 | the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor, | |
26 | Boston, MA 02110-1301, USA. | |
27 | ||
28 | */ | |
29 | ||
30 | #include "bcm43xx.h" | |
31 | #include "bcm43xx_dma.h" | |
32 | #include "bcm43xx_main.h" | |
33 | #include "bcm43xx_debugfs.h" | |
34 | #include "bcm43xx_power.h" | |
f398f02d | 35 | #include "bcm43xx_xmit.h" |
f222313a | 36 | |
d1ca6c4f | 37 | #include <linux/dma-mapping.h> |
f222313a JL |
38 | #include <linux/pci.h> |
39 | #include <linux/delay.h> | |
40 | #include <linux/skbuff.h> | |
f222313a JL |
41 | |
42 | ||
43 | static inline int free_slots(struct bcm43xx_dmaring *ring) | |
44 | { | |
45 | return (ring->nr_slots - ring->used_slots); | |
46 | } | |
47 | ||
48 | static inline int next_slot(struct bcm43xx_dmaring *ring, int slot) | |
49 | { | |
50 | assert(slot >= -1 && slot <= ring->nr_slots - 1); | |
51 | if (slot == ring->nr_slots - 1) | |
52 | return 0; | |
53 | return slot + 1; | |
54 | } | |
55 | ||
56 | static inline int prev_slot(struct bcm43xx_dmaring *ring, int slot) | |
57 | { | |
58 | assert(slot >= 0 && slot <= ring->nr_slots - 1); | |
59 | if (slot == 0) | |
60 | return ring->nr_slots - 1; | |
61 | return slot - 1; | |
62 | } | |
63 | ||
64 | /* Request a slot for usage. */ | |
65 | static inline | |
66 | int request_slot(struct bcm43xx_dmaring *ring) | |
67 | { | |
68 | int slot; | |
69 | ||
70 | assert(ring->tx); | |
71 | assert(!ring->suspended); | |
72 | assert(free_slots(ring) != 0); | |
73 | ||
74 | slot = next_slot(ring, ring->current_slot); | |
75 | ring->current_slot = slot; | |
76 | ring->used_slots++; | |
77 | ||
78 | /* Check the number of available slots and suspend TX, | |
79 | * if we are running low on free slots. | |
80 | */ | |
81 | if (unlikely(free_slots(ring) < ring->suspend_mark)) { | |
82 | netif_stop_queue(ring->bcm->net_dev); | |
83 | ring->suspended = 1; | |
84 | } | |
85 | #ifdef CONFIG_BCM43XX_DEBUG | |
86 | if (ring->used_slots > ring->max_used_slots) | |
87 | ring->max_used_slots = ring->used_slots; | |
88 | #endif /* CONFIG_BCM43XX_DEBUG*/ | |
89 | ||
90 | return slot; | |
91 | } | |
92 | ||
93 | /* Return a slot to the free slots. */ | |
94 | static inline | |
95 | void return_slot(struct bcm43xx_dmaring *ring, int slot) | |
96 | { | |
97 | assert(ring->tx); | |
98 | ||
99 | ring->used_slots--; | |
100 | ||
101 | /* Check if TX is suspended and check if we have | |
102 | * enough free slots to resume it again. | |
103 | */ | |
104 | if (unlikely(ring->suspended)) { | |
105 | if (free_slots(ring) >= ring->resume_mark) { | |
106 | ring->suspended = 0; | |
107 | netif_wake_queue(ring->bcm->net_dev); | |
108 | } | |
109 | } | |
110 | } | |
111 | ||
9218e02b MB |
112 | u16 bcm43xx_dmacontroller_base(int dma64bit, int controller_idx) |
113 | { | |
114 | static const u16 map64[] = { | |
115 | BCM43xx_MMIO_DMA64_BASE0, | |
116 | BCM43xx_MMIO_DMA64_BASE1, | |
117 | BCM43xx_MMIO_DMA64_BASE2, | |
118 | BCM43xx_MMIO_DMA64_BASE3, | |
119 | BCM43xx_MMIO_DMA64_BASE4, | |
120 | BCM43xx_MMIO_DMA64_BASE5, | |
121 | }; | |
122 | static const u16 map32[] = { | |
123 | BCM43xx_MMIO_DMA32_BASE0, | |
124 | BCM43xx_MMIO_DMA32_BASE1, | |
125 | BCM43xx_MMIO_DMA32_BASE2, | |
126 | BCM43xx_MMIO_DMA32_BASE3, | |
127 | BCM43xx_MMIO_DMA32_BASE4, | |
128 | BCM43xx_MMIO_DMA32_BASE5, | |
129 | }; | |
130 | ||
131 | if (dma64bit) { | |
132 | assert(controller_idx >= 0 && | |
133 | controller_idx < ARRAY_SIZE(map64)); | |
134 | return map64[controller_idx]; | |
135 | } | |
136 | assert(controller_idx >= 0 && | |
137 | controller_idx < ARRAY_SIZE(map32)); | |
138 | return map32[controller_idx]; | |
139 | } | |
140 | ||
f222313a JL |
141 | static inline |
142 | dma_addr_t map_descbuffer(struct bcm43xx_dmaring *ring, | |
143 | unsigned char *buf, | |
144 | size_t len, | |
145 | int tx) | |
146 | { | |
147 | dma_addr_t dmaaddr; | |
47103039 | 148 | int direction = PCI_DMA_FROMDEVICE; |
f222313a | 149 | |
47103039 LF |
150 | if (tx) |
151 | direction = PCI_DMA_TODEVICE; | |
152 | ||
153 | dmaaddr = pci_map_single(ring->bcm->pci_dev, | |
f222313a | 154 | buf, len, |
47103039 | 155 | direction); |
f222313a JL |
156 | |
157 | return dmaaddr; | |
158 | } | |
159 | ||
160 | static inline | |
161 | void unmap_descbuffer(struct bcm43xx_dmaring *ring, | |
162 | dma_addr_t addr, | |
163 | size_t len, | |
164 | int tx) | |
165 | { | |
166 | if (tx) { | |
47103039 | 167 | pci_unmap_single(ring->bcm->pci_dev, |
f222313a | 168 | addr, len, |
47103039 | 169 | PCI_DMA_TODEVICE); |
f222313a | 170 | } else { |
47103039 | 171 | pci_unmap_single(ring->bcm->pci_dev, |
f222313a | 172 | addr, len, |
47103039 | 173 | PCI_DMA_FROMDEVICE); |
f222313a JL |
174 | } |
175 | } | |
176 | ||
177 | static inline | |
178 | void sync_descbuffer_for_cpu(struct bcm43xx_dmaring *ring, | |
179 | dma_addr_t addr, | |
180 | size_t len) | |
181 | { | |
182 | assert(!ring->tx); | |
183 | ||
47103039 LF |
184 | pci_dma_sync_single_for_cpu(ring->bcm->pci_dev, |
185 | addr, len, PCI_DMA_FROMDEVICE); | |
f222313a JL |
186 | } |
187 | ||
188 | static inline | |
189 | void sync_descbuffer_for_device(struct bcm43xx_dmaring *ring, | |
190 | dma_addr_t addr, | |
191 | size_t len) | |
192 | { | |
193 | assert(!ring->tx); | |
194 | ||
47103039 LF |
195 | pci_dma_sync_single_for_cpu(ring->bcm->pci_dev, |
196 | addr, len, PCI_DMA_TODEVICE); | |
f222313a JL |
197 | } |
198 | ||
f222313a JL |
199 | /* Unmap and free a descriptor buffer. */ |
200 | static inline | |
201 | void free_descriptor_buffer(struct bcm43xx_dmaring *ring, | |
f222313a JL |
202 | struct bcm43xx_dmadesc_meta *meta, |
203 | int irq_context) | |
204 | { | |
205 | assert(meta->skb); | |
512a8091 PZ |
206 | if (irq_context) |
207 | dev_kfree_skb_irq(meta->skb); | |
208 | else | |
209 | dev_kfree_skb(meta->skb); | |
f222313a | 210 | meta->skb = NULL; |
f222313a JL |
211 | } |
212 | ||
213 | static int alloc_ringmemory(struct bcm43xx_dmaring *ring) | |
214 | { | |
47103039 LF |
215 | ring->descbase = pci_alloc_consistent(ring->bcm->pci_dev, BCM43xx_DMA_RINGMEMSIZE, |
216 | &(ring->dmabase)); | |
9218e02b | 217 | if (!ring->descbase) { |
47103039 LF |
218 | /* Allocation may have failed due to pci_alloc_consistent |
219 | insisting on use of GFP_DMA, which is more restrictive | |
220 | than necessary... */ | |
221 | struct dma_desc *rx_ring; | |
222 | dma_addr_t rx_ring_dma; | |
223 | ||
224 | rx_ring = kzalloc(BCM43xx_DMA_RINGMEMSIZE, GFP_KERNEL); | |
225 | if (!rx_ring) | |
226 | goto out_err; | |
227 | ||
228 | rx_ring_dma = pci_map_single(ring->bcm->pci_dev, rx_ring, | |
229 | BCM43xx_DMA_RINGMEMSIZE, | |
230 | PCI_DMA_BIDIRECTIONAL); | |
231 | ||
232 | if (pci_dma_mapping_error(rx_ring_dma) || | |
233 | rx_ring_dma + BCM43xx_DMA_RINGMEMSIZE > ring->bcm->dma_mask) { | |
234 | /* Sigh... */ | |
235 | if (!pci_dma_mapping_error(rx_ring_dma)) | |
236 | pci_unmap_single(ring->bcm->pci_dev, | |
237 | rx_ring_dma, BCM43xx_DMA_RINGMEMSIZE, | |
238 | PCI_DMA_BIDIRECTIONAL); | |
239 | rx_ring_dma = pci_map_single(ring->bcm->pci_dev, | |
240 | rx_ring, BCM43xx_DMA_RINGMEMSIZE, | |
241 | PCI_DMA_BIDIRECTIONAL); | |
242 | if (pci_dma_mapping_error(rx_ring_dma) || | |
243 | rx_ring_dma + BCM43xx_DMA_RINGMEMSIZE > ring->bcm->dma_mask) { | |
244 | assert(0); | |
245 | if (!pci_dma_mapping_error(rx_ring_dma)) | |
246 | pci_unmap_single(ring->bcm->pci_dev, | |
247 | rx_ring_dma, BCM43xx_DMA_RINGMEMSIZE, | |
248 | PCI_DMA_BIDIRECTIONAL); | |
249 | goto out_err; | |
250 | } | |
251 | } | |
252 | ||
253 | ring->descbase = rx_ring; | |
254 | ring->dmabase = rx_ring_dma; | |
f222313a | 255 | } |
9218e02b | 256 | memset(ring->descbase, 0, BCM43xx_DMA_RINGMEMSIZE); |
f222313a JL |
257 | |
258 | return 0; | |
47103039 LF |
259 | out_err: |
260 | printk(KERN_ERR PFX "DMA ringmemory allocation failed\n"); | |
261 | return -ENOMEM; | |
f222313a JL |
262 | } |
263 | ||
264 | static void free_ringmemory(struct bcm43xx_dmaring *ring) | |
265 | { | |
266 | struct device *dev = &(ring->bcm->pci_dev->dev); | |
267 | ||
268 | dma_free_coherent(dev, BCM43xx_DMA_RINGMEMSIZE, | |
9218e02b | 269 | ring->descbase, ring->dmabase); |
f222313a JL |
270 | } |
271 | ||
272 | /* Reset the RX DMA channel */ | |
273 | int bcm43xx_dmacontroller_rx_reset(struct bcm43xx_private *bcm, | |
9218e02b | 274 | u16 mmio_base, int dma64) |
f222313a JL |
275 | { |
276 | int i; | |
277 | u32 value; | |
9218e02b | 278 | u16 offset; |
f222313a | 279 | |
9218e02b MB |
280 | offset = dma64 ? BCM43xx_DMA64_RXCTL : BCM43xx_DMA32_RXCTL; |
281 | bcm43xx_write32(bcm, mmio_base + offset, 0); | |
f222313a | 282 | for (i = 0; i < 1000; i++) { |
9218e02b MB |
283 | offset = dma64 ? BCM43xx_DMA64_RXSTATUS : BCM43xx_DMA32_RXSTATUS; |
284 | value = bcm43xx_read32(bcm, mmio_base + offset); | |
285 | if (dma64) { | |
286 | value &= BCM43xx_DMA64_RXSTAT; | |
287 | if (value == BCM43xx_DMA64_RXSTAT_DISABLED) { | |
288 | i = -1; | |
289 | break; | |
290 | } | |
291 | } else { | |
292 | value &= BCM43xx_DMA32_RXSTATE; | |
293 | if (value == BCM43xx_DMA32_RXSTAT_DISABLED) { | |
294 | i = -1; | |
295 | break; | |
296 | } | |
f222313a JL |
297 | } |
298 | udelay(10); | |
299 | } | |
300 | if (i != -1) { | |
301 | printk(KERN_ERR PFX "Error: Wait on DMA RX status timed out.\n"); | |
302 | return -ENODEV; | |
303 | } | |
304 | ||
305 | return 0; | |
306 | } | |
307 | ||
f222313a JL |
308 | /* Reset the RX DMA channel */ |
309 | int bcm43xx_dmacontroller_tx_reset(struct bcm43xx_private *bcm, | |
9218e02b | 310 | u16 mmio_base, int dma64) |
f222313a JL |
311 | { |
312 | int i; | |
313 | u32 value; | |
9218e02b | 314 | u16 offset; |
f222313a JL |
315 | |
316 | for (i = 0; i < 1000; i++) { | |
9218e02b MB |
317 | offset = dma64 ? BCM43xx_DMA64_TXSTATUS : BCM43xx_DMA32_TXSTATUS; |
318 | value = bcm43xx_read32(bcm, mmio_base + offset); | |
319 | if (dma64) { | |
320 | value &= BCM43xx_DMA64_TXSTAT; | |
321 | if (value == BCM43xx_DMA64_TXSTAT_DISABLED || | |
322 | value == BCM43xx_DMA64_TXSTAT_IDLEWAIT || | |
323 | value == BCM43xx_DMA64_TXSTAT_STOPPED) | |
324 | break; | |
325 | } else { | |
326 | value &= BCM43xx_DMA32_TXSTATE; | |
327 | if (value == BCM43xx_DMA32_TXSTAT_DISABLED || | |
328 | value == BCM43xx_DMA32_TXSTAT_IDLEWAIT || | |
329 | value == BCM43xx_DMA32_TXSTAT_STOPPED) | |
330 | break; | |
331 | } | |
f222313a JL |
332 | udelay(10); |
333 | } | |
9218e02b MB |
334 | offset = dma64 ? BCM43xx_DMA64_TXCTL : BCM43xx_DMA32_TXCTL; |
335 | bcm43xx_write32(bcm, mmio_base + offset, 0); | |
f222313a | 336 | for (i = 0; i < 1000; i++) { |
9218e02b MB |
337 | offset = dma64 ? BCM43xx_DMA64_TXSTATUS : BCM43xx_DMA32_TXSTATUS; |
338 | value = bcm43xx_read32(bcm, mmio_base + offset); | |
339 | if (dma64) { | |
340 | value &= BCM43xx_DMA64_TXSTAT; | |
341 | if (value == BCM43xx_DMA64_TXSTAT_DISABLED) { | |
342 | i = -1; | |
343 | break; | |
344 | } | |
345 | } else { | |
346 | value &= BCM43xx_DMA32_TXSTATE; | |
347 | if (value == BCM43xx_DMA32_TXSTAT_DISABLED) { | |
348 | i = -1; | |
349 | break; | |
350 | } | |
f222313a JL |
351 | } |
352 | udelay(10); | |
353 | } | |
354 | if (i != -1) { | |
355 | printk(KERN_ERR PFX "Error: Wait on DMA TX status timed out.\n"); | |
356 | return -ENODEV; | |
357 | } | |
358 | /* ensure the reset is completed. */ | |
359 | udelay(300); | |
360 | ||
361 | return 0; | |
362 | } | |
363 | ||
9218e02b MB |
364 | static void fill_descriptor(struct bcm43xx_dmaring *ring, |
365 | struct bcm43xx_dmadesc_generic *desc, | |
366 | dma_addr_t dmaaddr, | |
367 | u16 bufsize, | |
368 | int start, int end, int irq) | |
369 | { | |
370 | int slot; | |
371 | ||
372 | slot = bcm43xx_dma_desc2idx(ring, desc); | |
373 | assert(slot >= 0 && slot < ring->nr_slots); | |
374 | ||
375 | if (ring->dma64) { | |
376 | u32 ctl0 = 0, ctl1 = 0; | |
377 | u32 addrlo, addrhi; | |
378 | u32 addrext; | |
379 | ||
380 | addrlo = (u32)(dmaaddr & 0xFFFFFFFF); | |
381 | addrhi = (((u64)dmaaddr >> 32) & ~BCM43xx_DMA64_ROUTING); | |
382 | addrext = (((u64)dmaaddr >> 32) >> BCM43xx_DMA64_ROUTING_SHIFT); | |
383 | addrhi |= ring->routing; | |
384 | if (slot == ring->nr_slots - 1) | |
385 | ctl0 |= BCM43xx_DMA64_DCTL0_DTABLEEND; | |
386 | if (start) | |
387 | ctl0 |= BCM43xx_DMA64_DCTL0_FRAMESTART; | |
388 | if (end) | |
389 | ctl0 |= BCM43xx_DMA64_DCTL0_FRAMEEND; | |
390 | if (irq) | |
391 | ctl0 |= BCM43xx_DMA64_DCTL0_IRQ; | |
392 | ctl1 |= (bufsize - ring->frameoffset) | |
393 | & BCM43xx_DMA64_DCTL1_BYTECNT; | |
394 | ctl1 |= (addrext << BCM43xx_DMA64_DCTL1_ADDREXT_SHIFT) | |
395 | & BCM43xx_DMA64_DCTL1_ADDREXT_MASK; | |
396 | ||
397 | desc->dma64.control0 = cpu_to_le32(ctl0); | |
398 | desc->dma64.control1 = cpu_to_le32(ctl1); | |
399 | desc->dma64.address_low = cpu_to_le32(addrlo); | |
400 | desc->dma64.address_high = cpu_to_le32(addrhi); | |
401 | } else { | |
402 | u32 ctl; | |
403 | u32 addr; | |
404 | u32 addrext; | |
405 | ||
406 | addr = (u32)(dmaaddr & ~BCM43xx_DMA32_ROUTING); | |
407 | addrext = (u32)(dmaaddr & BCM43xx_DMA32_ROUTING) | |
408 | >> BCM43xx_DMA32_ROUTING_SHIFT; | |
409 | addr |= ring->routing; | |
410 | ctl = (bufsize - ring->frameoffset) | |
411 | & BCM43xx_DMA32_DCTL_BYTECNT; | |
412 | if (slot == ring->nr_slots - 1) | |
413 | ctl |= BCM43xx_DMA32_DCTL_DTABLEEND; | |
414 | if (start) | |
415 | ctl |= BCM43xx_DMA32_DCTL_FRAMESTART; | |
416 | if (end) | |
417 | ctl |= BCM43xx_DMA32_DCTL_FRAMEEND; | |
418 | if (irq) | |
419 | ctl |= BCM43xx_DMA32_DCTL_IRQ; | |
420 | ctl |= (addrext << BCM43xx_DMA32_DCTL_ADDREXT_SHIFT) | |
421 | & BCM43xx_DMA32_DCTL_ADDREXT_MASK; | |
422 | ||
423 | desc->dma32.control = cpu_to_le32(ctl); | |
424 | desc->dma32.address = cpu_to_le32(addr); | |
425 | } | |
426 | } | |
427 | ||
f222313a | 428 | static int setup_rx_descbuffer(struct bcm43xx_dmaring *ring, |
9218e02b | 429 | struct bcm43xx_dmadesc_generic *desc, |
f222313a JL |
430 | struct bcm43xx_dmadesc_meta *meta, |
431 | gfp_t gfp_flags) | |
432 | { | |
433 | struct bcm43xx_rxhdr *rxhdr; | |
9218e02b | 434 | struct bcm43xx_hwxmitstatus *xmitstat; |
f222313a | 435 | dma_addr_t dmaaddr; |
f222313a JL |
436 | struct sk_buff *skb; |
437 | ||
f222313a JL |
438 | assert(!ring->tx); |
439 | ||
440 | skb = __dev_alloc_skb(ring->rx_buffersize, gfp_flags); | |
441 | if (unlikely(!skb)) | |
442 | return -ENOMEM; | |
443 | dmaaddr = map_descbuffer(ring, skb->data, ring->rx_buffersize, 0); | |
47103039 LF |
444 | /* This hardware bug work-around adapted from the b44 driver. |
445 | The chip may be unable to do PCI DMA to/from anything above 1GB */ | |
446 | if (pci_dma_mapping_error(dmaaddr) || | |
447 | dmaaddr + ring->rx_buffersize > ring->bcm->dma_mask) { | |
448 | /* This one has 30-bit addressing... */ | |
449 | if (!pci_dma_mapping_error(dmaaddr)) | |
450 | pci_unmap_single(ring->bcm->pci_dev, | |
451 | dmaaddr, ring->rx_buffersize, | |
452 | PCI_DMA_FROMDEVICE); | |
453 | dev_kfree_skb_any(skb); | |
454 | skb = __dev_alloc_skb(ring->rx_buffersize,GFP_DMA); | |
455 | if (skb == NULL) | |
456 | return -ENOMEM; | |
457 | dmaaddr = pci_map_single(ring->bcm->pci_dev, | |
458 | skb->data, ring->rx_buffersize, | |
459 | PCI_DMA_FROMDEVICE); | |
460 | if (pci_dma_mapping_error(dmaaddr) || | |
461 | dmaaddr + ring->rx_buffersize > ring->bcm->dma_mask) { | |
462 | assert(0); | |
463 | dev_kfree_skb_any(skb); | |
464 | return -ENOMEM; | |
465 | } | |
466 | } | |
f222313a JL |
467 | meta->skb = skb; |
468 | meta->dmaaddr = dmaaddr; | |
469 | skb->dev = ring->bcm->net_dev; | |
9218e02b MB |
470 | |
471 | fill_descriptor(ring, desc, dmaaddr, | |
472 | ring->rx_buffersize, 0, 0, 0); | |
f222313a JL |
473 | |
474 | rxhdr = (struct bcm43xx_rxhdr *)(skb->data); | |
475 | rxhdr->frame_length = 0; | |
476 | rxhdr->flags1 = 0; | |
9218e02b MB |
477 | xmitstat = (struct bcm43xx_hwxmitstatus *)(skb->data); |
478 | xmitstat->cookie = 0; | |
f222313a JL |
479 | |
480 | return 0; | |
481 | } | |
482 | ||
483 | /* Allocate the initial descbuffers. | |
484 | * This is used for an RX ring only. | |
485 | */ | |
486 | static int alloc_initial_descbuffers(struct bcm43xx_dmaring *ring) | |
487 | { | |
488 | int i, err = -ENOMEM; | |
9218e02b | 489 | struct bcm43xx_dmadesc_generic *desc; |
f222313a JL |
490 | struct bcm43xx_dmadesc_meta *meta; |
491 | ||
492 | for (i = 0; i < ring->nr_slots; i++) { | |
9218e02b | 493 | desc = bcm43xx_dma_idx2desc(ring, i, &meta); |
f222313a JL |
494 | |
495 | err = setup_rx_descbuffer(ring, desc, meta, GFP_KERNEL); | |
496 | if (err) | |
497 | goto err_unwind; | |
f222313a | 498 | } |
9218e02b | 499 | mb(); |
f222313a | 500 | ring->used_slots = ring->nr_slots; |
f222313a JL |
501 | err = 0; |
502 | out: | |
503 | return err; | |
504 | ||
505 | err_unwind: | |
ea72ab22 | 506 | for (i--; i >= 0; i--) { |
9218e02b | 507 | desc = bcm43xx_dma_idx2desc(ring, i, &meta); |
f222313a JL |
508 | |
509 | unmap_descbuffer(ring, meta->dmaaddr, ring->rx_buffersize, 0); | |
510 | dev_kfree_skb(meta->skb); | |
511 | } | |
f222313a JL |
512 | goto out; |
513 | } | |
514 | ||
515 | /* Do initial setup of the DMA controller. | |
516 | * Reset the controller, write the ring busaddress | |
517 | * and switch the "enable" bit on. | |
518 | */ | |
519 | static int dmacontroller_setup(struct bcm43xx_dmaring *ring) | |
520 | { | |
521 | int err = 0; | |
522 | u32 value; | |
9218e02b | 523 | u32 addrext; |
f222313a JL |
524 | |
525 | if (ring->tx) { | |
9218e02b MB |
526 | if (ring->dma64) { |
527 | u64 ringbase = (u64)(ring->dmabase); | |
528 | ||
529 | addrext = ((ringbase >> 32) >> BCM43xx_DMA64_ROUTING_SHIFT); | |
530 | value = BCM43xx_DMA64_TXENABLE; | |
531 | value |= (addrext << BCM43xx_DMA64_TXADDREXT_SHIFT) | |
532 | & BCM43xx_DMA64_TXADDREXT_MASK; | |
533 | bcm43xx_dma_write(ring, BCM43xx_DMA64_TXCTL, value); | |
534 | bcm43xx_dma_write(ring, BCM43xx_DMA64_TXRINGLO, | |
535 | (ringbase & 0xFFFFFFFF)); | |
536 | bcm43xx_dma_write(ring, BCM43xx_DMA64_TXRINGHI, | |
537 | ((ringbase >> 32) & ~BCM43xx_DMA64_ROUTING) | |
538 | | ring->routing); | |
539 | } else { | |
540 | u32 ringbase = (u32)(ring->dmabase); | |
541 | ||
542 | addrext = (ringbase >> BCM43xx_DMA32_ROUTING_SHIFT); | |
543 | value = BCM43xx_DMA32_TXENABLE; | |
544 | value |= (addrext << BCM43xx_DMA32_TXADDREXT_SHIFT) | |
545 | & BCM43xx_DMA32_TXADDREXT_MASK; | |
546 | bcm43xx_dma_write(ring, BCM43xx_DMA32_TXCTL, value); | |
547 | bcm43xx_dma_write(ring, BCM43xx_DMA32_TXRING, | |
548 | (ringbase & ~BCM43xx_DMA32_ROUTING) | |
549 | | ring->routing); | |
550 | } | |
f222313a JL |
551 | } else { |
552 | err = alloc_initial_descbuffers(ring); | |
553 | if (err) | |
554 | goto out; | |
9218e02b MB |
555 | if (ring->dma64) { |
556 | u64 ringbase = (u64)(ring->dmabase); | |
557 | ||
558 | addrext = ((ringbase >> 32) >> BCM43xx_DMA64_ROUTING_SHIFT); | |
559 | value = (ring->frameoffset << BCM43xx_DMA64_RXFROFF_SHIFT); | |
560 | value |= BCM43xx_DMA64_RXENABLE; | |
561 | value |= (addrext << BCM43xx_DMA64_RXADDREXT_SHIFT) | |
562 | & BCM43xx_DMA64_RXADDREXT_MASK; | |
563 | bcm43xx_dma_write(ring, BCM43xx_DMA64_RXCTL, value); | |
564 | bcm43xx_dma_write(ring, BCM43xx_DMA64_RXRINGLO, | |
565 | (ringbase & 0xFFFFFFFF)); | |
566 | bcm43xx_dma_write(ring, BCM43xx_DMA64_RXRINGHI, | |
567 | ((ringbase >> 32) & ~BCM43xx_DMA64_ROUTING) | |
568 | | ring->routing); | |
569 | bcm43xx_dma_write(ring, BCM43xx_DMA64_RXINDEX, 200); | |
570 | } else { | |
571 | u32 ringbase = (u32)(ring->dmabase); | |
572 | ||
573 | addrext = (ringbase >> BCM43xx_DMA32_ROUTING_SHIFT); | |
574 | value = (ring->frameoffset << BCM43xx_DMA32_RXFROFF_SHIFT); | |
575 | value |= BCM43xx_DMA32_RXENABLE; | |
576 | value |= (addrext << BCM43xx_DMA32_RXADDREXT_SHIFT) | |
577 | & BCM43xx_DMA32_RXADDREXT_MASK; | |
578 | bcm43xx_dma_write(ring, BCM43xx_DMA32_RXCTL, value); | |
579 | bcm43xx_dma_write(ring, BCM43xx_DMA32_RXRING, | |
580 | (ringbase & ~BCM43xx_DMA32_ROUTING) | |
581 | | ring->routing); | |
582 | bcm43xx_dma_write(ring, BCM43xx_DMA32_RXINDEX, 200); | |
583 | } | |
f222313a JL |
584 | } |
585 | ||
586 | out: | |
587 | return err; | |
588 | } | |
589 | ||
590 | /* Shutdown the DMA controller. */ | |
591 | static void dmacontroller_cleanup(struct bcm43xx_dmaring *ring) | |
592 | { | |
593 | if (ring->tx) { | |
9218e02b MB |
594 | bcm43xx_dmacontroller_tx_reset(ring->bcm, ring->mmio_base, ring->dma64); |
595 | if (ring->dma64) { | |
596 | bcm43xx_dma_write(ring, BCM43xx_DMA64_TXRINGLO, 0); | |
597 | bcm43xx_dma_write(ring, BCM43xx_DMA64_TXRINGHI, 0); | |
598 | } else | |
599 | bcm43xx_dma_write(ring, BCM43xx_DMA32_TXRING, 0); | |
f222313a | 600 | } else { |
9218e02b MB |
601 | bcm43xx_dmacontroller_rx_reset(ring->bcm, ring->mmio_base, ring->dma64); |
602 | if (ring->dma64) { | |
603 | bcm43xx_dma_write(ring, BCM43xx_DMA64_RXRINGLO, 0); | |
604 | bcm43xx_dma_write(ring, BCM43xx_DMA64_RXRINGHI, 0); | |
605 | } else | |
606 | bcm43xx_dma_write(ring, BCM43xx_DMA32_RXRING, 0); | |
f222313a JL |
607 | } |
608 | } | |
609 | ||
610 | static void free_all_descbuffers(struct bcm43xx_dmaring *ring) | |
611 | { | |
9218e02b | 612 | struct bcm43xx_dmadesc_generic *desc; |
f222313a JL |
613 | struct bcm43xx_dmadesc_meta *meta; |
614 | int i; | |
615 | ||
616 | if (!ring->used_slots) | |
617 | return; | |
618 | for (i = 0; i < ring->nr_slots; i++) { | |
9218e02b | 619 | desc = bcm43xx_dma_idx2desc(ring, i, &meta); |
f222313a JL |
620 | |
621 | if (!meta->skb) { | |
622 | assert(ring->tx); | |
f222313a JL |
623 | continue; |
624 | } | |
625 | if (ring->tx) { | |
626 | unmap_descbuffer(ring, meta->dmaaddr, | |
9218e02b | 627 | meta->skb->len, 1); |
f222313a JL |
628 | } else { |
629 | unmap_descbuffer(ring, meta->dmaaddr, | |
9218e02b | 630 | ring->rx_buffersize, 0); |
f222313a | 631 | } |
9218e02b | 632 | free_descriptor_buffer(ring, meta, 0); |
f222313a JL |
633 | } |
634 | } | |
635 | ||
636 | /* Main initialization function. */ | |
637 | static | |
638 | struct bcm43xx_dmaring * bcm43xx_setup_dmaring(struct bcm43xx_private *bcm, | |
9218e02b MB |
639 | int controller_index, |
640 | int for_tx, | |
641 | int dma64) | |
f222313a JL |
642 | { |
643 | struct bcm43xx_dmaring *ring; | |
644 | int err; | |
9218e02b | 645 | int nr_slots; |
f222313a JL |
646 | |
647 | ring = kzalloc(sizeof(*ring), GFP_KERNEL); | |
648 | if (!ring) | |
649 | goto out; | |
650 | ||
9218e02b MB |
651 | nr_slots = BCM43xx_RXRING_SLOTS; |
652 | if (for_tx) | |
653 | nr_slots = BCM43xx_TXRING_SLOTS; | |
654 | ||
655 | ring->meta = kcalloc(nr_slots, sizeof(struct bcm43xx_dmadesc_meta), | |
f222313a JL |
656 | GFP_KERNEL); |
657 | if (!ring->meta) | |
658 | goto err_kfree_ring; | |
659 | ||
9218e02b MB |
660 | ring->routing = BCM43xx_DMA32_CLIENTTRANS; |
661 | if (dma64) | |
662 | ring->routing = BCM43xx_DMA64_CLIENTTRANS; | |
f222313a JL |
663 | #ifdef CONFIG_BCM947XX |
664 | if (bcm->pci_dev->bus->number == 0) | |
9218e02b | 665 | ring->routing = dma64 ? BCM43xx_DMA64_NOTRANS : BCM43xx_DMA32_NOTRANS; |
f222313a | 666 | #endif |
ea72ab22 | 667 | |
f222313a | 668 | ring->bcm = bcm; |
9218e02b | 669 | ring->nr_slots = nr_slots; |
f222313a JL |
670 | ring->suspend_mark = ring->nr_slots * BCM43xx_TXSUSPEND_PERCENT / 100; |
671 | ring->resume_mark = ring->nr_slots * BCM43xx_TXRESUME_PERCENT / 100; | |
672 | assert(ring->suspend_mark < ring->resume_mark); | |
9218e02b MB |
673 | ring->mmio_base = bcm43xx_dmacontroller_base(dma64, controller_index); |
674 | ring->index = controller_index; | |
675 | ring->dma64 = !!dma64; | |
676 | if (for_tx) { | |
f222313a JL |
677 | ring->tx = 1; |
678 | ring->current_slot = -1; | |
679 | } else { | |
9218e02b MB |
680 | if (ring->index == 0) { |
681 | ring->rx_buffersize = BCM43xx_DMA0_RX_BUFFERSIZE; | |
682 | ring->frameoffset = BCM43xx_DMA0_RX_FRAMEOFFSET; | |
683 | } else if (ring->index == 3) { | |
684 | ring->rx_buffersize = BCM43xx_DMA3_RX_BUFFERSIZE; | |
685 | ring->frameoffset = BCM43xx_DMA3_RX_FRAMEOFFSET; | |
686 | } else | |
f222313a | 687 | assert(0); |
f222313a JL |
688 | } |
689 | ||
690 | err = alloc_ringmemory(ring); | |
691 | if (err) | |
692 | goto err_kfree_meta; | |
693 | err = dmacontroller_setup(ring); | |
694 | if (err) | |
695 | goto err_free_ringmemory; | |
47103039 | 696 | return ring; |
f222313a JL |
697 | |
698 | out: | |
47103039 | 699 | printk(KERN_ERR PFX "Error in bcm43xx_setup_dmaring\n"); |
f222313a JL |
700 | return ring; |
701 | ||
702 | err_free_ringmemory: | |
703 | free_ringmemory(ring); | |
704 | err_kfree_meta: | |
705 | kfree(ring->meta); | |
706 | err_kfree_ring: | |
707 | kfree(ring); | |
708 | ring = NULL; | |
709 | goto out; | |
710 | } | |
711 | ||
712 | /* Main cleanup function. */ | |
713 | static void bcm43xx_destroy_dmaring(struct bcm43xx_dmaring *ring) | |
714 | { | |
715 | if (!ring) | |
716 | return; | |
717 | ||
9218e02b MB |
718 | dprintk(KERN_INFO PFX "DMA-%s 0x%04X (%s) max used slots: %d/%d\n", |
719 | (ring->dma64) ? "64" : "32", | |
f222313a JL |
720 | ring->mmio_base, |
721 | (ring->tx) ? "TX" : "RX", | |
722 | ring->max_used_slots, ring->nr_slots); | |
723 | /* Device IRQs are disabled prior entering this function, | |
724 | * so no need to take care of concurrency with rx handler stuff. | |
725 | */ | |
726 | dmacontroller_cleanup(ring); | |
727 | free_all_descbuffers(ring); | |
728 | free_ringmemory(ring); | |
729 | ||
730 | kfree(ring->meta); | |
731 | kfree(ring); | |
732 | } | |
733 | ||
734 | void bcm43xx_dma_free(struct bcm43xx_private *bcm) | |
735 | { | |
49f29efa MB |
736 | struct bcm43xx_dma *dma; |
737 | ||
738 | if (bcm43xx_using_pio(bcm)) | |
739 | return; | |
740 | dma = bcm43xx_current_dma(bcm); | |
ea72ab22 | 741 | |
9218e02b MB |
742 | bcm43xx_destroy_dmaring(dma->rx_ring3); |
743 | dma->rx_ring3 = NULL; | |
ea72ab22 MB |
744 | bcm43xx_destroy_dmaring(dma->rx_ring0); |
745 | dma->rx_ring0 = NULL; | |
9218e02b MB |
746 | |
747 | bcm43xx_destroy_dmaring(dma->tx_ring5); | |
748 | dma->tx_ring5 = NULL; | |
749 | bcm43xx_destroy_dmaring(dma->tx_ring4); | |
750 | dma->tx_ring4 = NULL; | |
ea72ab22 MB |
751 | bcm43xx_destroy_dmaring(dma->tx_ring3); |
752 | dma->tx_ring3 = NULL; | |
753 | bcm43xx_destroy_dmaring(dma->tx_ring2); | |
754 | dma->tx_ring2 = NULL; | |
755 | bcm43xx_destroy_dmaring(dma->tx_ring1); | |
756 | dma->tx_ring1 = NULL; | |
757 | bcm43xx_destroy_dmaring(dma->tx_ring0); | |
758 | dma->tx_ring0 = NULL; | |
f222313a JL |
759 | } |
760 | ||
761 | int bcm43xx_dma_init(struct bcm43xx_private *bcm) | |
762 | { | |
e9357c05 | 763 | struct bcm43xx_dma *dma = bcm43xx_current_dma(bcm); |
f222313a JL |
764 | struct bcm43xx_dmaring *ring; |
765 | int err = -ENOMEM; | |
9218e02b | 766 | int dma64 = 0; |
9218e02b | 767 | |
47103039 LF |
768 | bcm->dma_mask = bcm43xx_get_supported_dma_mask(bcm); |
769 | if (bcm->dma_mask == DMA_64BIT_MASK) | |
9218e02b | 770 | dma64 = 1; |
47103039 LF |
771 | err = pci_set_dma_mask(bcm->pci_dev, bcm->dma_mask); |
772 | if (err) | |
773 | goto no_dma; | |
774 | err = pci_set_consistent_dma_mask(bcm->pci_dev, bcm->dma_mask); | |
775 | if (err) | |
776 | goto no_dma; | |
f222313a JL |
777 | |
778 | /* setup TX DMA channels. */ | |
9218e02b | 779 | ring = bcm43xx_setup_dmaring(bcm, 0, 1, dma64); |
f222313a JL |
780 | if (!ring) |
781 | goto out; | |
ea72ab22 | 782 | dma->tx_ring0 = ring; |
f222313a | 783 | |
9218e02b | 784 | ring = bcm43xx_setup_dmaring(bcm, 1, 1, dma64); |
f222313a JL |
785 | if (!ring) |
786 | goto err_destroy_tx0; | |
ea72ab22 | 787 | dma->tx_ring1 = ring; |
f222313a | 788 | |
9218e02b | 789 | ring = bcm43xx_setup_dmaring(bcm, 2, 1, dma64); |
f222313a JL |
790 | if (!ring) |
791 | goto err_destroy_tx1; | |
ea72ab22 | 792 | dma->tx_ring2 = ring; |
f222313a | 793 | |
9218e02b | 794 | ring = bcm43xx_setup_dmaring(bcm, 3, 1, dma64); |
f222313a JL |
795 | if (!ring) |
796 | goto err_destroy_tx2; | |
ea72ab22 | 797 | dma->tx_ring3 = ring; |
f222313a | 798 | |
9218e02b | 799 | ring = bcm43xx_setup_dmaring(bcm, 4, 1, dma64); |
f222313a JL |
800 | if (!ring) |
801 | goto err_destroy_tx3; | |
9218e02b MB |
802 | dma->tx_ring4 = ring; |
803 | ||
804 | ring = bcm43xx_setup_dmaring(bcm, 5, 1, dma64); | |
805 | if (!ring) | |
806 | goto err_destroy_tx4; | |
807 | dma->tx_ring5 = ring; | |
808 | ||
809 | /* setup RX DMA channels. */ | |
810 | ring = bcm43xx_setup_dmaring(bcm, 0, 0, dma64); | |
811 | if (!ring) | |
812 | goto err_destroy_tx5; | |
ea72ab22 | 813 | dma->rx_ring0 = ring; |
f222313a JL |
814 | |
815 | if (bcm->current_core->rev < 5) { | |
9218e02b | 816 | ring = bcm43xx_setup_dmaring(bcm, 3, 0, dma64); |
f222313a JL |
817 | if (!ring) |
818 | goto err_destroy_rx0; | |
9218e02b | 819 | dma->rx_ring3 = ring; |
f222313a JL |
820 | } |
821 | ||
47103039 LF |
822 | dprintk(KERN_INFO PFX "%d-bit DMA initialized\n", |
823 | (bcm->dma_mask == DMA_64BIT_MASK) ? 64 : | |
824 | (bcm->dma_mask == DMA_32BIT_MASK) ? 32 : 30); | |
f222313a JL |
825 | err = 0; |
826 | out: | |
827 | return err; | |
828 | ||
829 | err_destroy_rx0: | |
ea72ab22 MB |
830 | bcm43xx_destroy_dmaring(dma->rx_ring0); |
831 | dma->rx_ring0 = NULL; | |
9218e02b MB |
832 | err_destroy_tx5: |
833 | bcm43xx_destroy_dmaring(dma->tx_ring5); | |
834 | dma->tx_ring5 = NULL; | |
835 | err_destroy_tx4: | |
836 | bcm43xx_destroy_dmaring(dma->tx_ring4); | |
837 | dma->tx_ring4 = NULL; | |
f222313a | 838 | err_destroy_tx3: |
ea72ab22 MB |
839 | bcm43xx_destroy_dmaring(dma->tx_ring3); |
840 | dma->tx_ring3 = NULL; | |
f222313a | 841 | err_destroy_tx2: |
ea72ab22 MB |
842 | bcm43xx_destroy_dmaring(dma->tx_ring2); |
843 | dma->tx_ring2 = NULL; | |
f222313a | 844 | err_destroy_tx1: |
ea72ab22 MB |
845 | bcm43xx_destroy_dmaring(dma->tx_ring1); |
846 | dma->tx_ring1 = NULL; | |
f222313a | 847 | err_destroy_tx0: |
ea72ab22 MB |
848 | bcm43xx_destroy_dmaring(dma->tx_ring0); |
849 | dma->tx_ring0 = NULL; | |
47103039 LF |
850 | no_dma: |
851 | #ifdef CONFIG_BCM43XX_PIO | |
852 | printk(KERN_WARNING PFX "DMA not supported on this device." | |
853 | " Falling back to PIO.\n"); | |
854 | bcm->__using_pio = 1; | |
855 | return -ENOSYS; | |
856 | #else | |
857 | printk(KERN_ERR PFX "FATAL: DMA not supported and PIO not configured. " | |
858 | "Please recompile the driver with PIO support.\n"); | |
859 | return -ENODEV; | |
860 | #endif /* CONFIG_BCM43XX_PIO */ | |
f222313a JL |
861 | } |
862 | ||
863 | /* Generate a cookie for the TX header. */ | |
ea72ab22 MB |
864 | static u16 generate_cookie(struct bcm43xx_dmaring *ring, |
865 | int slot) | |
f222313a | 866 | { |
9218e02b | 867 | u16 cookie = 0x1000; |
f222313a JL |
868 | |
869 | /* Use the upper 4 bits of the cookie as | |
870 | * DMA controller ID and store the slot number | |
ea9a7719 MB |
871 | * in the lower 12 bits. |
872 | * Note that the cookie must never be 0, as this | |
873 | * is a special value used in RX path. | |
f222313a | 874 | */ |
9218e02b MB |
875 | switch (ring->index) { |
876 | case 0: | |
ea9a7719 | 877 | cookie = 0xA000; |
f222313a | 878 | break; |
9218e02b | 879 | case 1: |
ea9a7719 | 880 | cookie = 0xB000; |
f222313a | 881 | break; |
9218e02b | 882 | case 2: |
ea9a7719 | 883 | cookie = 0xC000; |
f222313a | 884 | break; |
9218e02b | 885 | case 3: |
ea9a7719 | 886 | cookie = 0xD000; |
f222313a | 887 | break; |
9218e02b MB |
888 | case 4: |
889 | cookie = 0xE000; | |
890 | break; | |
891 | case 5: | |
892 | cookie = 0xF000; | |
893 | break; | |
f222313a JL |
894 | } |
895 | assert(((u16)slot & 0xF000) == 0x0000); | |
896 | cookie |= (u16)slot; | |
897 | ||
898 | return cookie; | |
899 | } | |
900 | ||
901 | /* Inspect a cookie and find out to which controller/slot it belongs. */ | |
ea72ab22 | 902 | static |
f222313a JL |
903 | struct bcm43xx_dmaring * parse_cookie(struct bcm43xx_private *bcm, |
904 | u16 cookie, int *slot) | |
905 | { | |
e9357c05 | 906 | struct bcm43xx_dma *dma = bcm43xx_current_dma(bcm); |
f222313a JL |
907 | struct bcm43xx_dmaring *ring = NULL; |
908 | ||
909 | switch (cookie & 0xF000) { | |
ea9a7719 | 910 | case 0xA000: |
ea72ab22 | 911 | ring = dma->tx_ring0; |
f222313a | 912 | break; |
ea9a7719 | 913 | case 0xB000: |
ea72ab22 | 914 | ring = dma->tx_ring1; |
f222313a | 915 | break; |
ea9a7719 | 916 | case 0xC000: |
ea72ab22 | 917 | ring = dma->tx_ring2; |
f222313a | 918 | break; |
ea9a7719 | 919 | case 0xD000: |
ea72ab22 | 920 | ring = dma->tx_ring3; |
f222313a | 921 | break; |
9218e02b MB |
922 | case 0xE000: |
923 | ring = dma->tx_ring4; | |
924 | break; | |
925 | case 0xF000: | |
926 | ring = dma->tx_ring5; | |
927 | break; | |
f222313a JL |
928 | default: |
929 | assert(0); | |
930 | } | |
931 | *slot = (cookie & 0x0FFF); | |
932 | assert(*slot >= 0 && *slot < ring->nr_slots); | |
933 | ||
934 | return ring; | |
935 | } | |
936 | ||
ea72ab22 MB |
937 | static void dmacontroller_poke_tx(struct bcm43xx_dmaring *ring, |
938 | int slot) | |
f222313a | 939 | { |
9218e02b MB |
940 | u16 offset; |
941 | int descsize; | |
942 | ||
f222313a JL |
943 | /* Everything is ready to start. Buffers are DMA mapped and |
944 | * associated with slots. | |
945 | * "slot" is the last slot of the new frame we want to transmit. | |
946 | * Close your seat belts now, please. | |
947 | */ | |
948 | wmb(); | |
949 | slot = next_slot(ring, slot); | |
9218e02b MB |
950 | offset = (ring->dma64) ? BCM43xx_DMA64_TXINDEX : BCM43xx_DMA32_TXINDEX; |
951 | descsize = (ring->dma64) ? sizeof(struct bcm43xx_dmadesc64) | |
952 | : sizeof(struct bcm43xx_dmadesc32); | |
953 | bcm43xx_dma_write(ring, offset, | |
954 | (u32)(slot * descsize)); | |
f222313a JL |
955 | } |
956 | ||
9218e02b MB |
957 | static void dma_tx_fragment(struct bcm43xx_dmaring *ring, |
958 | struct sk_buff *skb, | |
959 | u8 cur_frag) | |
f222313a JL |
960 | { |
961 | int slot; | |
9218e02b | 962 | struct bcm43xx_dmadesc_generic *desc; |
f222313a | 963 | struct bcm43xx_dmadesc_meta *meta; |
9218e02b | 964 | dma_addr_t dmaaddr; |
47103039 | 965 | struct sk_buff *bounce_skb; |
f222313a JL |
966 | |
967 | assert(skb_shinfo(skb)->nr_frags == 0); | |
968 | ||
969 | slot = request_slot(ring); | |
9218e02b | 970 | desc = bcm43xx_dma_idx2desc(ring, slot, &meta); |
f222313a | 971 | |
f222313a JL |
972 | /* Add a device specific TX header. */ |
973 | assert(skb_headroom(skb) >= sizeof(struct bcm43xx_txhdr)); | |
974 | /* Reserve enough headroom for the device tx header. */ | |
975 | __skb_push(skb, sizeof(struct bcm43xx_txhdr)); | |
976 | /* Now calculate and add the tx header. | |
977 | * The tx header includes the PLCP header. | |
978 | */ | |
979 | bcm43xx_generate_txhdr(ring->bcm, | |
980 | (struct bcm43xx_txhdr *)skb->data, | |
981 | skb->data + sizeof(struct bcm43xx_txhdr), | |
982 | skb->len - sizeof(struct bcm43xx_txhdr), | |
983 | (cur_frag == 0), | |
984 | generate_cookie(ring, slot)); | |
47103039 LF |
985 | dmaaddr = map_descbuffer(ring, skb->data, skb->len, 1); |
986 | if (dma_mapping_error(dmaaddr) || dmaaddr + skb->len > ring->bcm->dma_mask) { | |
987 | /* chip cannot handle DMA to/from > 1GB, use bounce buffer (copied from b44 driver) */ | |
988 | if (!dma_mapping_error(dmaaddr)) | |
989 | unmap_descbuffer(ring, dmaaddr, skb->len, 1); | |
990 | bounce_skb = __dev_alloc_skb(skb->len, GFP_ATOMIC|GFP_DMA); | |
991 | if (!bounce_skb) | |
992 | return; | |
993 | dmaaddr = map_descbuffer(ring, bounce_skb->data, bounce_skb->len, 1); | |
994 | if (dma_mapping_error(dmaaddr) || dmaaddr + skb->len > ring->bcm->dma_mask) { | |
995 | if (!dma_mapping_error(dmaaddr)) | |
996 | unmap_descbuffer(ring, dmaaddr, skb->len, 1); | |
997 | dev_kfree_skb_any(bounce_skb); | |
998 | assert(0); | |
999 | return; | |
1000 | } | |
d626f62b ACM |
1001 | skb_copy_from_linear_data(skb, skb_put(bounce_skb, skb->len), |
1002 | skb->len); | |
47103039 LF |
1003 | dev_kfree_skb_any(skb); |
1004 | skb = bounce_skb; | |
1005 | } | |
f222313a JL |
1006 | |
1007 | meta->skb = skb; | |
9218e02b | 1008 | meta->dmaaddr = dmaaddr; |
f222313a | 1009 | |
9218e02b MB |
1010 | fill_descriptor(ring, desc, dmaaddr, |
1011 | skb->len, 1, 1, 1); | |
f222313a | 1012 | |
f222313a JL |
1013 | /* Now transfer the whole frame. */ |
1014 | dmacontroller_poke_tx(ring, slot); | |
f222313a JL |
1015 | } |
1016 | ||
ea72ab22 MB |
1017 | int bcm43xx_dma_tx(struct bcm43xx_private *bcm, |
1018 | struct ieee80211_txb *txb) | |
f222313a JL |
1019 | { |
1020 | /* We just received a packet from the kernel network subsystem. | |
1021 | * Add headers and DMA map the memory. Poke | |
1022 | * the device to send the stuff. | |
1023 | * Note that this is called from atomic context. | |
1024 | */ | |
e9357c05 | 1025 | struct bcm43xx_dmaring *ring = bcm43xx_current_dma(bcm)->tx_ring1; |
f222313a JL |
1026 | u8 i; |
1027 | struct sk_buff *skb; | |
1028 | ||
1029 | assert(ring->tx); | |
1030 | if (unlikely(free_slots(ring) < txb->nr_frags)) { | |
1031 | /* The queue should be stopped, | |
1032 | * if we are low on free slots. | |
1033 | * If this ever triggers, we have to lower the suspend_mark. | |
1034 | */ | |
1035 | dprintkl(KERN_ERR PFX "Out of DMA descriptor slots!\n"); | |
1036 | return -ENOMEM; | |
1037 | } | |
1038 | ||
f222313a JL |
1039 | for (i = 0; i < txb->nr_frags; i++) { |
1040 | skb = txb->fragments[i]; | |
512a8091 PZ |
1041 | /* Take skb from ieee80211_txb_free */ |
1042 | txb->fragments[i] = NULL; | |
1043 | dma_tx_fragment(ring, skb, i); | |
f222313a | 1044 | } |
512a8091 | 1045 | ieee80211_txb_free(txb); |
f222313a JL |
1046 | |
1047 | return 0; | |
1048 | } | |
1049 | ||
ea72ab22 MB |
1050 | void bcm43xx_dma_handle_xmitstatus(struct bcm43xx_private *bcm, |
1051 | struct bcm43xx_xmitstatus *status) | |
f222313a JL |
1052 | { |
1053 | struct bcm43xx_dmaring *ring; | |
9218e02b | 1054 | struct bcm43xx_dmadesc_generic *desc; |
f222313a JL |
1055 | struct bcm43xx_dmadesc_meta *meta; |
1056 | int is_last_fragment; | |
1057 | int slot; | |
9218e02b | 1058 | u32 tmp; |
f222313a JL |
1059 | |
1060 | ring = parse_cookie(bcm, status->cookie, &slot); | |
1061 | assert(ring); | |
1062 | assert(ring->tx); | |
f222313a JL |
1063 | while (1) { |
1064 | assert(slot >= 0 && slot < ring->nr_slots); | |
9218e02b | 1065 | desc = bcm43xx_dma_idx2desc(ring, slot, &meta); |
f222313a | 1066 | |
9218e02b MB |
1067 | if (ring->dma64) { |
1068 | tmp = le32_to_cpu(desc->dma64.control0); | |
1069 | is_last_fragment = !!(tmp & BCM43xx_DMA64_DCTL0_FRAMEEND); | |
1070 | } else { | |
1071 | tmp = le32_to_cpu(desc->dma32.control); | |
1072 | is_last_fragment = !!(tmp & BCM43xx_DMA32_DCTL_FRAMEEND); | |
1073 | } | |
f222313a | 1074 | unmap_descbuffer(ring, meta->dmaaddr, meta->skb->len, 1); |
9218e02b | 1075 | free_descriptor_buffer(ring, meta, 1); |
f222313a JL |
1076 | /* Everything belonging to the slot is unmapped |
1077 | * and freed, so we can return it. | |
1078 | */ | |
1079 | return_slot(ring, slot); | |
1080 | ||
1081 | if (is_last_fragment) | |
1082 | break; | |
1083 | slot = next_slot(ring, slot); | |
1084 | } | |
1085 | bcm->stats.last_tx = jiffies; | |
f222313a JL |
1086 | } |
1087 | ||
ea72ab22 MB |
1088 | static void dma_rx(struct bcm43xx_dmaring *ring, |
1089 | int *slot) | |
f222313a | 1090 | { |
9218e02b | 1091 | struct bcm43xx_dmadesc_generic *desc; |
f222313a JL |
1092 | struct bcm43xx_dmadesc_meta *meta; |
1093 | struct bcm43xx_rxhdr *rxhdr; | |
1094 | struct sk_buff *skb; | |
1095 | u16 len; | |
1096 | int err; | |
1097 | dma_addr_t dmaaddr; | |
1098 | ||
9218e02b | 1099 | desc = bcm43xx_dma_idx2desc(ring, *slot, &meta); |
f222313a JL |
1100 | |
1101 | sync_descbuffer_for_cpu(ring, meta->dmaaddr, ring->rx_buffersize); | |
1102 | skb = meta->skb; | |
1103 | ||
9218e02b | 1104 | if (ring->index == 3) { |
f222313a JL |
1105 | /* We received an xmit status. */ |
1106 | struct bcm43xx_hwxmitstatus *hw = (struct bcm43xx_hwxmitstatus *)skb->data; | |
1107 | struct bcm43xx_xmitstatus stat; | |
ea9a7719 | 1108 | int i = 0; |
f222313a JL |
1109 | |
1110 | stat.cookie = le16_to_cpu(hw->cookie); | |
ea9a7719 MB |
1111 | while (stat.cookie == 0) { |
1112 | if (unlikely(++i >= 10000)) { | |
1113 | assert(0); | |
1114 | break; | |
1115 | } | |
1116 | udelay(2); | |
1117 | barrier(); | |
1118 | stat.cookie = le16_to_cpu(hw->cookie); | |
1119 | } | |
f222313a JL |
1120 | stat.flags = hw->flags; |
1121 | stat.cnt1 = hw->cnt1; | |
1122 | stat.cnt2 = hw->cnt2; | |
1123 | stat.seq = le16_to_cpu(hw->seq); | |
1124 | stat.unknown = le16_to_cpu(hw->unknown); | |
1125 | ||
1126 | bcm43xx_debugfs_log_txstat(ring->bcm, &stat); | |
1127 | bcm43xx_dma_handle_xmitstatus(ring->bcm, &stat); | |
1128 | /* recycle the descriptor buffer. */ | |
1129 | sync_descbuffer_for_device(ring, meta->dmaaddr, ring->rx_buffersize); | |
1130 | ||
1131 | return; | |
1132 | } | |
1133 | rxhdr = (struct bcm43xx_rxhdr *)skb->data; | |
1134 | len = le16_to_cpu(rxhdr->frame_length); | |
1135 | if (len == 0) { | |
1136 | int i = 0; | |
1137 | ||
1138 | do { | |
1139 | udelay(2); | |
1140 | barrier(); | |
1141 | len = le16_to_cpu(rxhdr->frame_length); | |
1142 | } while (len == 0 && i++ < 5); | |
ea72ab22 MB |
1143 | if (unlikely(len == 0)) { |
1144 | /* recycle the descriptor buffer. */ | |
1145 | sync_descbuffer_for_device(ring, meta->dmaaddr, | |
1146 | ring->rx_buffersize); | |
f222313a | 1147 | goto drop; |
ea72ab22 | 1148 | } |
f222313a JL |
1149 | } |
1150 | if (unlikely(len > ring->rx_buffersize)) { | |
1151 | /* The data did not fit into one descriptor buffer | |
1152 | * and is split over multiple buffers. | |
1153 | * This should never happen, as we try to allocate buffers | |
1154 | * big enough. So simply ignore this packet. | |
1155 | */ | |
ea72ab22 MB |
1156 | int cnt = 0; |
1157 | s32 tmp = len; | |
1158 | ||
1159 | while (1) { | |
9218e02b | 1160 | desc = bcm43xx_dma_idx2desc(ring, *slot, &meta); |
ea72ab22 MB |
1161 | /* recycle the descriptor buffer. */ |
1162 | sync_descbuffer_for_device(ring, meta->dmaaddr, | |
1163 | ring->rx_buffersize); | |
f222313a JL |
1164 | *slot = next_slot(ring, *slot); |
1165 | cnt++; | |
ea72ab22 MB |
1166 | tmp -= ring->rx_buffersize; |
1167 | if (tmp <= 0) | |
1168 | break; | |
f222313a | 1169 | } |
ea72ab22 | 1170 | printkl(KERN_ERR PFX "DMA RX buffer too small " |
9218e02b MB |
1171 | "(len: %u, buffer: %u, nr-dropped: %d)\n", |
1172 | len, ring->rx_buffersize, cnt); | |
f222313a JL |
1173 | goto drop; |
1174 | } | |
1175 | len -= IEEE80211_FCS_LEN; | |
1176 | ||
1177 | dmaaddr = meta->dmaaddr; | |
1178 | err = setup_rx_descbuffer(ring, desc, meta, GFP_ATOMIC); | |
1179 | if (unlikely(err)) { | |
1180 | dprintkl(KERN_ERR PFX "DMA RX: setup_rx_descbuffer() failed\n"); | |
ea72ab22 MB |
1181 | sync_descbuffer_for_device(ring, dmaaddr, |
1182 | ring->rx_buffersize); | |
f222313a JL |
1183 | goto drop; |
1184 | } | |
1185 | ||
1186 | unmap_descbuffer(ring, dmaaddr, ring->rx_buffersize, 0); | |
1187 | skb_put(skb, len + ring->frameoffset); | |
1188 | skb_pull(skb, ring->frameoffset); | |
1189 | ||
1190 | err = bcm43xx_rx(ring->bcm, skb, rxhdr); | |
1191 | if (err) { | |
1192 | dev_kfree_skb_irq(skb); | |
1193 | goto drop; | |
1194 | } | |
1195 | ||
1196 | drop: | |
1197 | return; | |
1198 | } | |
1199 | ||
ea72ab22 | 1200 | void bcm43xx_dma_rx(struct bcm43xx_dmaring *ring) |
f222313a JL |
1201 | { |
1202 | u32 status; | |
1203 | u16 descptr; | |
1204 | int slot, current_slot; | |
1205 | #ifdef CONFIG_BCM43XX_DEBUG | |
1206 | int used_slots = 0; | |
1207 | #endif | |
1208 | ||
1209 | assert(!ring->tx); | |
9218e02b MB |
1210 | if (ring->dma64) { |
1211 | status = bcm43xx_dma_read(ring, BCM43xx_DMA64_RXSTATUS); | |
1212 | descptr = (status & BCM43xx_DMA64_RXSTATDPTR); | |
1213 | current_slot = descptr / sizeof(struct bcm43xx_dmadesc64); | |
1214 | } else { | |
1215 | status = bcm43xx_dma_read(ring, BCM43xx_DMA32_RXSTATUS); | |
1216 | descptr = (status & BCM43xx_DMA32_RXDPTR); | |
1217 | current_slot = descptr / sizeof(struct bcm43xx_dmadesc32); | |
1218 | } | |
f222313a JL |
1219 | assert(current_slot >= 0 && current_slot < ring->nr_slots); |
1220 | ||
1221 | slot = ring->current_slot; | |
1222 | for ( ; slot != current_slot; slot = next_slot(ring, slot)) { | |
1223 | dma_rx(ring, &slot); | |
1224 | #ifdef CONFIG_BCM43XX_DEBUG | |
1225 | if (++used_slots > ring->max_used_slots) | |
1226 | ring->max_used_slots = used_slots; | |
1227 | #endif | |
1228 | } | |
9218e02b MB |
1229 | if (ring->dma64) { |
1230 | bcm43xx_dma_write(ring, BCM43xx_DMA64_RXINDEX, | |
1231 | (u32)(slot * sizeof(struct bcm43xx_dmadesc64))); | |
1232 | } else { | |
1233 | bcm43xx_dma_write(ring, BCM43xx_DMA32_RXINDEX, | |
1234 | (u32)(slot * sizeof(struct bcm43xx_dmadesc32))); | |
1235 | } | |
f222313a | 1236 | ring->current_slot = slot; |
f222313a JL |
1237 | } |
1238 | ||
aae37781 MB |
1239 | void bcm43xx_dma_tx_suspend(struct bcm43xx_dmaring *ring) |
1240 | { | |
1241 | assert(ring->tx); | |
1242 | bcm43xx_power_saving_ctl_bits(ring->bcm, -1, 1); | |
9218e02b MB |
1243 | if (ring->dma64) { |
1244 | bcm43xx_dma_write(ring, BCM43xx_DMA64_TXCTL, | |
1245 | bcm43xx_dma_read(ring, BCM43xx_DMA64_TXCTL) | |
1246 | | BCM43xx_DMA64_TXSUSPEND); | |
1247 | } else { | |
1248 | bcm43xx_dma_write(ring, BCM43xx_DMA32_TXCTL, | |
1249 | bcm43xx_dma_read(ring, BCM43xx_DMA32_TXCTL) | |
1250 | | BCM43xx_DMA32_TXSUSPEND); | |
1251 | } | |
aae37781 MB |
1252 | } |
1253 | ||
1254 | void bcm43xx_dma_tx_resume(struct bcm43xx_dmaring *ring) | |
1255 | { | |
1256 | assert(ring->tx); | |
9218e02b MB |
1257 | if (ring->dma64) { |
1258 | bcm43xx_dma_write(ring, BCM43xx_DMA64_TXCTL, | |
1259 | bcm43xx_dma_read(ring, BCM43xx_DMA64_TXCTL) | |
1260 | & ~BCM43xx_DMA64_TXSUSPEND); | |
1261 | } else { | |
1262 | bcm43xx_dma_write(ring, BCM43xx_DMA32_TXCTL, | |
1263 | bcm43xx_dma_read(ring, BCM43xx_DMA32_TXCTL) | |
1264 | & ~BCM43xx_DMA32_TXSUSPEND); | |
1265 | } | |
aae37781 MB |
1266 | bcm43xx_power_saving_ctl_bits(ring->bcm, -1, -1); |
1267 | } |