Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * IEEE 1394 for Linux | |
3 | * | |
4 | * kernel ISO transmission/reception | |
5 | * | |
6 | * Copyright (C) 2002 Maas Digital LLC | |
7 | * | |
8 | * This code is licensed under the GPL. See the file COPYING in the root | |
9 | * directory of the kernel sources for details. | |
10 | */ | |
11 | ||
12 | #include <linux/slab.h> | |
13 | #include <linux/sched.h> | |
14 | #include "iso.h" | |
15 | ||
16 | void hpsb_iso_stop(struct hpsb_iso *iso) | |
17 | { | |
18 | if (!(iso->flags & HPSB_ISO_DRIVER_STARTED)) | |
19 | return; | |
20 | ||
21 | iso->host->driver->isoctl(iso, iso->type == HPSB_ISO_XMIT ? | |
22 | XMIT_STOP : RECV_STOP, 0); | |
23 | iso->flags &= ~HPSB_ISO_DRIVER_STARTED; | |
24 | } | |
25 | ||
26 | void hpsb_iso_shutdown(struct hpsb_iso *iso) | |
27 | { | |
28 | if (iso->flags & HPSB_ISO_DRIVER_INIT) { | |
29 | hpsb_iso_stop(iso); | |
30 | iso->host->driver->isoctl(iso, iso->type == HPSB_ISO_XMIT ? | |
31 | XMIT_SHUTDOWN : RECV_SHUTDOWN, 0); | |
32 | iso->flags &= ~HPSB_ISO_DRIVER_INIT; | |
33 | } | |
34 | ||
35 | dma_region_free(&iso->data_buf); | |
36 | kfree(iso); | |
37 | } | |
38 | ||
066ef9c2 JMH |
39 | static struct hpsb_iso *hpsb_iso_common_init(struct hpsb_host *host, |
40 | enum hpsb_iso_type type, | |
1da177e4 LT |
41 | unsigned int data_buf_size, |
42 | unsigned int buf_packets, | |
066ef9c2 | 43 | int channel, int dma_mode, |
1da177e4 | 44 | int irq_interval, |
066ef9c2 JMH |
45 | void (*callback) (struct hpsb_iso |
46 | *)) | |
1da177e4 LT |
47 | { |
48 | struct hpsb_iso *iso; | |
49 | int dma_direction; | |
50 | ||
51 | /* make sure driver supports the ISO API */ | |
52 | if (!host->driver->isoctl) { | |
066ef9c2 JMH |
53 | printk(KERN_INFO |
54 | "ieee1394: host driver '%s' does not support the rawiso API\n", | |
1da177e4 LT |
55 | host->driver->name); |
56 | return NULL; | |
57 | } | |
58 | ||
59 | /* sanitize parameters */ | |
60 | ||
61 | if (buf_packets < 2) | |
62 | buf_packets = 2; | |
63 | ||
066ef9c2 JMH |
64 | if ((dma_mode < HPSB_ISO_DMA_DEFAULT) |
65 | || (dma_mode > HPSB_ISO_DMA_PACKET_PER_BUFFER)) | |
66 | dma_mode = HPSB_ISO_DMA_DEFAULT; | |
1da177e4 | 67 | |
1934b8b6 | 68 | if ((irq_interval < 0) || (irq_interval > buf_packets / 4)) |
066ef9c2 JMH |
69 | irq_interval = buf_packets / 4; |
70 | if (irq_interval == 0) /* really interrupt for each packet */ | |
1da177e4 | 71 | irq_interval = 1; |
1da177e4 LT |
72 | |
73 | if (channel < -1 || channel >= 64) | |
74 | return NULL; | |
75 | ||
76 | /* channel = -1 is OK for multi-channel recv but not for xmit */ | |
77 | if (type == HPSB_ISO_XMIT && channel < 0) | |
78 | return NULL; | |
79 | ||
80 | /* allocate and write the struct hpsb_iso */ | |
81 | ||
066ef9c2 JMH |
82 | iso = |
83 | kmalloc(sizeof(*iso) + | |
84 | buf_packets * sizeof(struct hpsb_iso_packet_info), | |
85 | GFP_KERNEL); | |
1da177e4 LT |
86 | if (!iso) |
87 | return NULL; | |
88 | ||
89 | iso->infos = (struct hpsb_iso_packet_info *)(iso + 1); | |
90 | ||
91 | iso->type = type; | |
92 | iso->host = host; | |
93 | iso->hostdata = NULL; | |
94 | iso->callback = callback; | |
95 | init_waitqueue_head(&iso->waitq); | |
96 | iso->channel = channel; | |
97 | iso->irq_interval = irq_interval; | |
98 | iso->dma_mode = dma_mode; | |
99 | dma_region_init(&iso->data_buf); | |
100 | iso->buf_size = PAGE_ALIGN(data_buf_size); | |
101 | iso->buf_packets = buf_packets; | |
102 | iso->pkt_dma = 0; | |
103 | iso->first_packet = 0; | |
104 | spin_lock_init(&iso->lock); | |
105 | ||
106 | if (iso->type == HPSB_ISO_XMIT) { | |
107 | iso->n_ready_packets = iso->buf_packets; | |
108 | dma_direction = PCI_DMA_TODEVICE; | |
109 | } else { | |
110 | iso->n_ready_packets = 0; | |
111 | dma_direction = PCI_DMA_FROMDEVICE; | |
112 | } | |
113 | ||
114 | atomic_set(&iso->overflows, 0); | |
1934b8b6 | 115 | iso->bytes_discarded = 0; |
1da177e4 LT |
116 | iso->flags = 0; |
117 | iso->prebuffer = 0; | |
118 | ||
119 | /* allocate the packet buffer */ | |
066ef9c2 JMH |
120 | if (dma_region_alloc |
121 | (&iso->data_buf, iso->buf_size, host->pdev, dma_direction)) | |
1da177e4 LT |
122 | goto err; |
123 | ||
124 | return iso; | |
125 | ||
066ef9c2 | 126 | err: |
1da177e4 LT |
127 | hpsb_iso_shutdown(iso); |
128 | return NULL; | |
129 | } | |
130 | ||
066ef9c2 | 131 | int hpsb_iso_n_ready(struct hpsb_iso *iso) |
1da177e4 LT |
132 | { |
133 | unsigned long flags; | |
134 | int val; | |
135 | ||
136 | spin_lock_irqsave(&iso->lock, flags); | |
137 | val = iso->n_ready_packets; | |
138 | spin_unlock_irqrestore(&iso->lock, flags); | |
139 | ||
140 | return val; | |
141 | } | |
142 | ||
066ef9c2 | 143 | struct hpsb_iso *hpsb_iso_xmit_init(struct hpsb_host *host, |
1da177e4 LT |
144 | unsigned int data_buf_size, |
145 | unsigned int buf_packets, | |
146 | int channel, | |
147 | int speed, | |
148 | int irq_interval, | |
066ef9c2 | 149 | void (*callback) (struct hpsb_iso *)) |
1da177e4 LT |
150 | { |
151 | struct hpsb_iso *iso = hpsb_iso_common_init(host, HPSB_ISO_XMIT, | |
152 | data_buf_size, buf_packets, | |
066ef9c2 JMH |
153 | channel, |
154 | HPSB_ISO_DMA_DEFAULT, | |
155 | irq_interval, callback); | |
1da177e4 LT |
156 | if (!iso) |
157 | return NULL; | |
158 | ||
159 | iso->speed = speed; | |
160 | ||
161 | /* tell the driver to start working */ | |
162 | if (host->driver->isoctl(iso, XMIT_INIT, 0)) | |
163 | goto err; | |
164 | ||
165 | iso->flags |= HPSB_ISO_DRIVER_INIT; | |
166 | return iso; | |
167 | ||
066ef9c2 | 168 | err: |
1da177e4 LT |
169 | hpsb_iso_shutdown(iso); |
170 | return NULL; | |
171 | } | |
172 | ||
066ef9c2 | 173 | struct hpsb_iso *hpsb_iso_recv_init(struct hpsb_host *host, |
1da177e4 LT |
174 | unsigned int data_buf_size, |
175 | unsigned int buf_packets, | |
176 | int channel, | |
177 | int dma_mode, | |
178 | int irq_interval, | |
066ef9c2 | 179 | void (*callback) (struct hpsb_iso *)) |
1da177e4 LT |
180 | { |
181 | struct hpsb_iso *iso = hpsb_iso_common_init(host, HPSB_ISO_RECV, | |
182 | data_buf_size, buf_packets, | |
066ef9c2 JMH |
183 | channel, dma_mode, |
184 | irq_interval, callback); | |
1da177e4 LT |
185 | if (!iso) |
186 | return NULL; | |
187 | ||
188 | /* tell the driver to start working */ | |
189 | if (host->driver->isoctl(iso, RECV_INIT, 0)) | |
190 | goto err; | |
191 | ||
192 | iso->flags |= HPSB_ISO_DRIVER_INIT; | |
193 | return iso; | |
194 | ||
066ef9c2 | 195 | err: |
1da177e4 LT |
196 | hpsb_iso_shutdown(iso); |
197 | return NULL; | |
198 | } | |
199 | ||
200 | int hpsb_iso_recv_listen_channel(struct hpsb_iso *iso, unsigned char channel) | |
201 | { | |
202 | if (iso->type != HPSB_ISO_RECV || iso->channel != -1 || channel >= 64) | |
203 | return -EINVAL; | |
204 | return iso->host->driver->isoctl(iso, RECV_LISTEN_CHANNEL, channel); | |
205 | } | |
206 | ||
207 | int hpsb_iso_recv_unlisten_channel(struct hpsb_iso *iso, unsigned char channel) | |
208 | { | |
066ef9c2 JMH |
209 | if (iso->type != HPSB_ISO_RECV || iso->channel != -1 || channel >= 64) |
210 | return -EINVAL; | |
211 | return iso->host->driver->isoctl(iso, RECV_UNLISTEN_CHANNEL, channel); | |
1da177e4 LT |
212 | } |
213 | ||
214 | int hpsb_iso_recv_set_channel_mask(struct hpsb_iso *iso, u64 mask) | |
215 | { | |
216 | if (iso->type != HPSB_ISO_RECV || iso->channel != -1) | |
217 | return -EINVAL; | |
066ef9c2 JMH |
218 | return iso->host->driver->isoctl(iso, RECV_SET_CHANNEL_MASK, |
219 | (unsigned long)&mask); | |
1da177e4 LT |
220 | } |
221 | ||
222 | int hpsb_iso_recv_flush(struct hpsb_iso *iso) | |
223 | { | |
224 | if (iso->type != HPSB_ISO_RECV) | |
225 | return -EINVAL; | |
226 | return iso->host->driver->isoctl(iso, RECV_FLUSH, 0); | |
227 | } | |
228 | ||
229 | static int do_iso_xmit_start(struct hpsb_iso *iso, int cycle) | |
230 | { | |
231 | int retval = iso->host->driver->isoctl(iso, XMIT_START, cycle); | |
232 | if (retval) | |
233 | return retval; | |
234 | ||
235 | iso->flags |= HPSB_ISO_DRIVER_STARTED; | |
236 | return retval; | |
237 | } | |
238 | ||
239 | int hpsb_iso_xmit_start(struct hpsb_iso *iso, int cycle, int prebuffer) | |
240 | { | |
241 | if (iso->type != HPSB_ISO_XMIT) | |
242 | return -1; | |
243 | ||
244 | if (iso->flags & HPSB_ISO_DRIVER_STARTED) | |
245 | return 0; | |
246 | ||
247 | if (cycle < -1) | |
248 | cycle = -1; | |
249 | else if (cycle >= 8000) | |
250 | cycle %= 8000; | |
251 | ||
252 | iso->xmit_cycle = cycle; | |
253 | ||
254 | if (prebuffer < 0) | |
1934b8b6 | 255 | prebuffer = iso->buf_packets - 1; |
1da177e4 LT |
256 | else if (prebuffer == 0) |
257 | prebuffer = 1; | |
258 | ||
1934b8b6 BC |
259 | if (prebuffer >= iso->buf_packets) |
260 | prebuffer = iso->buf_packets - 1; | |
1da177e4 LT |
261 | |
262 | iso->prebuffer = prebuffer; | |
263 | ||
264 | /* remember the starting cycle; DMA will commence from xmit_queue_packets() | |
265 | once enough packets have been buffered */ | |
266 | iso->start_cycle = cycle; | |
267 | ||
268 | return 0; | |
269 | } | |
270 | ||
271 | int hpsb_iso_recv_start(struct hpsb_iso *iso, int cycle, int tag_mask, int sync) | |
272 | { | |
273 | int retval = 0; | |
274 | int isoctl_args[3]; | |
275 | ||
276 | if (iso->type != HPSB_ISO_RECV) | |
277 | return -1; | |
278 | ||
279 | if (iso->flags & HPSB_ISO_DRIVER_STARTED) | |
280 | return 0; | |
281 | ||
282 | if (cycle < -1) | |
283 | cycle = -1; | |
284 | else if (cycle >= 8000) | |
285 | cycle %= 8000; | |
286 | ||
287 | isoctl_args[0] = cycle; | |
288 | ||
289 | if (tag_mask < 0) | |
290 | /* match all tags */ | |
291 | tag_mask = 0xF; | |
292 | isoctl_args[1] = tag_mask; | |
293 | ||
294 | isoctl_args[2] = sync; | |
295 | ||
066ef9c2 JMH |
296 | retval = |
297 | iso->host->driver->isoctl(iso, RECV_START, | |
298 | (unsigned long)&isoctl_args[0]); | |
1da177e4 LT |
299 | if (retval) |
300 | return retval; | |
301 | ||
302 | iso->flags |= HPSB_ISO_DRIVER_STARTED; | |
303 | return retval; | |
304 | } | |
305 | ||
306 | /* check to make sure the user has not supplied bogus values of offset/len | |
307 | that would cause the kernel to access memory outside the buffer */ | |
308 | ||
309 | static int hpsb_iso_check_offset_len(struct hpsb_iso *iso, | |
310 | unsigned int offset, unsigned short len, | |
066ef9c2 JMH |
311 | unsigned int *out_offset, |
312 | unsigned short *out_len) | |
1da177e4 LT |
313 | { |
314 | if (offset >= iso->buf_size) | |
315 | return -EFAULT; | |
316 | ||
317 | /* make sure the packet does not go beyond the end of the buffer */ | |
318 | if (offset + len > iso->buf_size) | |
319 | return -EFAULT; | |
320 | ||
321 | /* check for wrap-around */ | |
322 | if (offset + len < offset) | |
323 | return -EFAULT; | |
324 | ||
325 | /* now we can trust 'offset' and 'length' */ | |
326 | *out_offset = offset; | |
327 | *out_len = len; | |
328 | ||
329 | return 0; | |
330 | } | |
331 | ||
066ef9c2 JMH |
332 | int hpsb_iso_xmit_queue_packet(struct hpsb_iso *iso, u32 offset, u16 len, |
333 | u8 tag, u8 sy) | |
1da177e4 LT |
334 | { |
335 | struct hpsb_iso_packet_info *info; | |
336 | unsigned long flags; | |
337 | int rv; | |
338 | ||
339 | if (iso->type != HPSB_ISO_XMIT) | |
340 | return -EINVAL; | |
341 | ||
342 | /* is there space in the buffer? */ | |
343 | if (iso->n_ready_packets <= 0) { | |
344 | return -EBUSY; | |
345 | } | |
346 | ||
347 | info = &iso->infos[iso->first_packet]; | |
348 | ||
349 | /* check for bogus offset/length */ | |
066ef9c2 JMH |
350 | if (hpsb_iso_check_offset_len |
351 | (iso, offset, len, &info->offset, &info->len)) | |
1da177e4 LT |
352 | return -EFAULT; |
353 | ||
354 | info->tag = tag; | |
355 | info->sy = sy; | |
356 | ||
357 | spin_lock_irqsave(&iso->lock, flags); | |
358 | ||
066ef9c2 | 359 | rv = iso->host->driver->isoctl(iso, XMIT_QUEUE, (unsigned long)info); |
1da177e4 LT |
360 | if (rv) |
361 | goto out; | |
362 | ||
363 | /* increment cursors */ | |
066ef9c2 JMH |
364 | iso->first_packet = (iso->first_packet + 1) % iso->buf_packets; |
365 | iso->xmit_cycle = (iso->xmit_cycle + 1) % 8000; | |
1da177e4 LT |
366 | iso->n_ready_packets--; |
367 | ||
368 | if (iso->prebuffer != 0) { | |
369 | iso->prebuffer--; | |
370 | if (iso->prebuffer <= 0) { | |
371 | iso->prebuffer = 0; | |
372 | rv = do_iso_xmit_start(iso, iso->start_cycle); | |
373 | } | |
374 | } | |
375 | ||
066ef9c2 | 376 | out: |
1da177e4 LT |
377 | spin_unlock_irqrestore(&iso->lock, flags); |
378 | return rv; | |
379 | } | |
380 | ||
381 | int hpsb_iso_xmit_sync(struct hpsb_iso *iso) | |
382 | { | |
383 | if (iso->type != HPSB_ISO_XMIT) | |
384 | return -EINVAL; | |
385 | ||
066ef9c2 JMH |
386 | return wait_event_interruptible(iso->waitq, |
387 | hpsb_iso_n_ready(iso) == | |
388 | iso->buf_packets); | |
1da177e4 LT |
389 | } |
390 | ||
391 | void hpsb_iso_packet_sent(struct hpsb_iso *iso, int cycle, int error) | |
392 | { | |
393 | unsigned long flags; | |
394 | spin_lock_irqsave(&iso->lock, flags); | |
395 | ||
396 | /* predict the cycle of the next packet to be queued */ | |
397 | ||
398 | /* jump ahead by the number of packets that are already buffered */ | |
399 | cycle += iso->buf_packets - iso->n_ready_packets; | |
400 | cycle %= 8000; | |
401 | ||
402 | iso->xmit_cycle = cycle; | |
403 | iso->n_ready_packets++; | |
404 | iso->pkt_dma = (iso->pkt_dma + 1) % iso->buf_packets; | |
405 | ||
406 | if (iso->n_ready_packets == iso->buf_packets || error != 0) { | |
407 | /* the buffer has run empty! */ | |
408 | atomic_inc(&iso->overflows); | |
409 | } | |
410 | ||
411 | spin_unlock_irqrestore(&iso->lock, flags); | |
412 | } | |
413 | ||
414 | void hpsb_iso_packet_received(struct hpsb_iso *iso, u32 offset, u16 len, | |
066ef9c2 JMH |
415 | u16 total_len, u16 cycle, u8 channel, u8 tag, |
416 | u8 sy) | |
1da177e4 LT |
417 | { |
418 | unsigned long flags; | |
419 | spin_lock_irqsave(&iso->lock, flags); | |
420 | ||
421 | if (iso->n_ready_packets == iso->buf_packets) { | |
422 | /* overflow! */ | |
423 | atomic_inc(&iso->overflows); | |
1934b8b6 BC |
424 | /* Record size of this discarded packet */ |
425 | iso->bytes_discarded += total_len; | |
1da177e4 LT |
426 | } else { |
427 | struct hpsb_iso_packet_info *info = &iso->infos[iso->pkt_dma]; | |
428 | info->offset = offset; | |
429 | info->len = len; | |
1934b8b6 | 430 | info->total_len = total_len; |
1da177e4 LT |
431 | info->cycle = cycle; |
432 | info->channel = channel; | |
433 | info->tag = tag; | |
434 | info->sy = sy; | |
435 | ||
066ef9c2 | 436 | iso->pkt_dma = (iso->pkt_dma + 1) % iso->buf_packets; |
1da177e4 LT |
437 | iso->n_ready_packets++; |
438 | } | |
439 | ||
440 | spin_unlock_irqrestore(&iso->lock, flags); | |
441 | } | |
442 | ||
443 | int hpsb_iso_recv_release_packets(struct hpsb_iso *iso, unsigned int n_packets) | |
444 | { | |
445 | unsigned long flags; | |
446 | unsigned int i; | |
447 | int rv = 0; | |
448 | ||
449 | if (iso->type != HPSB_ISO_RECV) | |
450 | return -1; | |
451 | ||
452 | spin_lock_irqsave(&iso->lock, flags); | |
453 | for (i = 0; i < n_packets; i++) { | |
454 | rv = iso->host->driver->isoctl(iso, RECV_RELEASE, | |
066ef9c2 JMH |
455 | (unsigned long)&iso->infos[iso-> |
456 | first_packet]); | |
1da177e4 LT |
457 | if (rv) |
458 | break; | |
459 | ||
066ef9c2 | 460 | iso->first_packet = (iso->first_packet + 1) % iso->buf_packets; |
1da177e4 | 461 | iso->n_ready_packets--; |
1934b8b6 BC |
462 | |
463 | /* release memory from packets discarded when queue was full */ | |
066ef9c2 | 464 | if (iso->n_ready_packets == 0) { /* Release only after all prior packets handled */ |
1934b8b6 BC |
465 | if (iso->bytes_discarded != 0) { |
466 | struct hpsb_iso_packet_info inf; | |
467 | inf.total_len = iso->bytes_discarded; | |
468 | iso->host->driver->isoctl(iso, RECV_RELEASE, | |
066ef9c2 | 469 | (unsigned long)&inf); |
1934b8b6 BC |
470 | iso->bytes_discarded = 0; |
471 | } | |
472 | } | |
1da177e4 LT |
473 | } |
474 | spin_unlock_irqrestore(&iso->lock, flags); | |
475 | return rv; | |
476 | } | |
477 | ||
478 | void hpsb_iso_wake(struct hpsb_iso *iso) | |
479 | { | |
480 | wake_up_interruptible(&iso->waitq); | |
481 | ||
482 | if (iso->callback) | |
483 | iso->callback(iso); | |
484 | } |