ieee1394: sbp2: more help in Kconfig
[linux-2.6] / drivers / ieee1394 / video1394.c
1 /*
2  * video1394.c - video driver for OHCI 1394 boards
3  * Copyright (C)1999,2000 Sebastien Rougeaux <sebastien.rougeaux@anu.edu.au>
4  *                        Peter Schlaile <udbz@rz.uni-karlsruhe.de>
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 2 of the License, or
9  * (at your option) any later version.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  * GNU General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License
17  * along with this program; if not, write to the Free Software Foundation,
18  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19  *
20  * NOTES:
21  *
22  * ioctl return codes:
23  * EFAULT is only for invalid address for the argp
24  * EINVAL for out of range values
25  * EBUSY when trying to use an already used resource
26  * ESRCH when trying to free/stop a not used resource
27  * EAGAIN for resource allocation failure that could perhaps succeed later
28  * ENOTTY for unsupported ioctl request
29  *
30  */
31 #include <linux/kernel.h>
32 #include <linux/list.h>
33 #include <linux/slab.h>
34 #include <linux/interrupt.h>
35 #include <linux/wait.h>
36 #include <linux/errno.h>
37 #include <linux/module.h>
38 #include <linux/init.h>
39 #include <linux/pci.h>
40 #include <linux/fs.h>
41 #include <linux/poll.h>
42 #include <linux/smp_lock.h>
43 #include <linux/delay.h>
44 #include <linux/bitops.h>
45 #include <linux/types.h>
46 #include <linux/vmalloc.h>
47 #include <linux/timex.h>
48 #include <linux/mm.h>
49 #include <linux/compat.h>
50 #include <linux/cdev.h>
51
52 #include "dma.h"
53 #include "highlevel.h"
54 #include "hosts.h"
55 #include "ieee1394.h"
56 #include "ieee1394_core.h"
57 #include "ieee1394_hotplug.h"
58 #include "ieee1394_types.h"
59 #include "nodemgr.h"
60 #include "ohci1394.h"
61 #include "video1394.h"
62
63 #define ISO_CHANNELS 64
64
65 struct it_dma_prg {
66         struct dma_cmd begin;
67         quadlet_t data[4];
68         struct dma_cmd end;
69         quadlet_t pad[4]; /* FIXME: quick hack for memory alignment */
70 };
71
72 struct dma_iso_ctx {
73         struct ti_ohci *ohci;
74         int type; /* OHCI_ISO_TRANSMIT or OHCI_ISO_RECEIVE */
75         struct ohci1394_iso_tasklet iso_tasklet;
76         int channel;
77         int ctx;
78         int last_buffer;
79         int * next_buffer;  /* For ISO Transmit of video packets
80                                to write the correct SYT field
81                                into the next block */
82         unsigned int num_desc;
83         unsigned int buf_size;
84         unsigned int frame_size;
85         unsigned int packet_size;
86         unsigned int left_size;
87         unsigned int nb_cmd;
88
89         struct dma_region dma;
90
91         struct dma_prog_region *prg_reg;
92
93         struct dma_cmd **ir_prg;
94         struct it_dma_prg **it_prg;
95
96         unsigned int *buffer_status;
97         unsigned int *buffer_prg_assignment;
98         struct timeval *buffer_time; /* time when the buffer was received */
99         unsigned int *last_used_cmd; /* For ISO Transmit with
100                                         variable sized packets only ! */
101         int ctrlClear;
102         int ctrlSet;
103         int cmdPtr;
104         int ctxMatch;
105         wait_queue_head_t waitq;
106         spinlock_t lock;
107         unsigned int syt_offset;
108         int flags;
109
110         struct list_head link;
111 };
112
113
114 struct file_ctx {
115         struct ti_ohci *ohci;
116         struct list_head context_list;
117         struct dma_iso_ctx *current_ctx;
118 };
119
120 #ifdef CONFIG_IEEE1394_VERBOSEDEBUG
121 #define VIDEO1394_DEBUG
122 #endif
123
124 #ifdef DBGMSG
125 #undef DBGMSG
126 #endif
127
128 #ifdef VIDEO1394_DEBUG
129 #define DBGMSG(card, fmt, args...) \
130 printk(KERN_INFO "video1394_%d: " fmt "\n" , card , ## args)
131 #else
132 #define DBGMSG(card, fmt, args...) do {} while (0)
133 #endif
134
135 /* print general (card independent) information */
136 #define PRINT_G(level, fmt, args...) \
137 printk(level "video1394: " fmt "\n" , ## args)
138
139 /* print card specific information */
140 #define PRINT(level, card, fmt, args...) \
141 printk(level "video1394_%d: " fmt "\n" , card , ## args)
142
143 static void wakeup_dma_ir_ctx(unsigned long l);
144 static void wakeup_dma_it_ctx(unsigned long l);
145
146 static struct hpsb_highlevel video1394_highlevel;
147
148 static int free_dma_iso_ctx(struct dma_iso_ctx *d)
149 {
150         int i;
151
152         DBGMSG(d->ohci->host->id, "Freeing dma_iso_ctx %d", d->ctx);
153
154         ohci1394_stop_context(d->ohci, d->ctrlClear, NULL);
155         if (d->iso_tasklet.link.next != NULL)
156                 ohci1394_unregister_iso_tasklet(d->ohci, &d->iso_tasklet);
157
158         dma_region_free(&d->dma);
159
160         if (d->prg_reg) {
161                 for (i = 0; i < d->num_desc; i++)
162                         dma_prog_region_free(&d->prg_reg[i]);
163                 kfree(d->prg_reg);
164         }
165
166         kfree(d->ir_prg);
167         kfree(d->it_prg);
168         kfree(d->buffer_status);
169         kfree(d->buffer_prg_assignment);
170         kfree(d->buffer_time);
171         kfree(d->last_used_cmd);
172         kfree(d->next_buffer);
173         list_del(&d->link);
174         kfree(d);
175
176         return 0;
177 }
178
179 static struct dma_iso_ctx *
180 alloc_dma_iso_ctx(struct ti_ohci *ohci, int type, int num_desc,
181                   int buf_size, int channel, unsigned int packet_size)
182 {
183         struct dma_iso_ctx *d;
184         int i;
185
186         d = kzalloc(sizeof(*d), GFP_KERNEL);
187         if (!d) {
188                 PRINT(KERN_ERR, ohci->host->id, "Failed to allocate dma_iso_ctx");
189                 return NULL;
190         }
191
192         d->ohci = ohci;
193         d->type = type;
194         d->channel = channel;
195         d->num_desc = num_desc;
196         d->frame_size = buf_size;
197         d->buf_size = PAGE_ALIGN(buf_size);
198         d->last_buffer = -1;
199         INIT_LIST_HEAD(&d->link);
200         init_waitqueue_head(&d->waitq);
201
202         /* Init the regions for easy cleanup */
203         dma_region_init(&d->dma);
204
205         if (dma_region_alloc(&d->dma, (d->num_desc - 1) * d->buf_size, ohci->dev,
206                              PCI_DMA_BIDIRECTIONAL)) {
207                 PRINT(KERN_ERR, ohci->host->id, "Failed to allocate dma buffer");
208                 free_dma_iso_ctx(d);
209                 return NULL;
210         }
211
212         if (type == OHCI_ISO_RECEIVE)
213                 ohci1394_init_iso_tasklet(&d->iso_tasklet, type,
214                                           wakeup_dma_ir_ctx,
215                                           (unsigned long) d);
216         else
217                 ohci1394_init_iso_tasklet(&d->iso_tasklet, type,
218                                           wakeup_dma_it_ctx,
219                                           (unsigned long) d);
220
221         if (ohci1394_register_iso_tasklet(ohci, &d->iso_tasklet) < 0) {
222                 PRINT(KERN_ERR, ohci->host->id, "no free iso %s contexts",
223                       type == OHCI_ISO_RECEIVE ? "receive" : "transmit");
224                 free_dma_iso_ctx(d);
225                 return NULL;
226         }
227         d->ctx = d->iso_tasklet.context;
228
229         d->prg_reg = kmalloc(d->num_desc * sizeof(*d->prg_reg), GFP_KERNEL);
230         if (!d->prg_reg) {
231                 PRINT(KERN_ERR, ohci->host->id, "Failed to allocate ir prg regs");
232                 free_dma_iso_ctx(d);
233                 return NULL;
234         }
235         /* Makes for easier cleanup */
236         for (i = 0; i < d->num_desc; i++)
237                 dma_prog_region_init(&d->prg_reg[i]);
238
239         if (type == OHCI_ISO_RECEIVE) {
240                 d->ctrlSet = OHCI1394_IsoRcvContextControlSet+32*d->ctx;
241                 d->ctrlClear = OHCI1394_IsoRcvContextControlClear+32*d->ctx;
242                 d->cmdPtr = OHCI1394_IsoRcvCommandPtr+32*d->ctx;
243                 d->ctxMatch = OHCI1394_IsoRcvContextMatch+32*d->ctx;
244
245                 d->ir_prg = kzalloc(d->num_desc * sizeof(*d->ir_prg),
246                                     GFP_KERNEL);
247
248                 if (!d->ir_prg) {
249                         PRINT(KERN_ERR, ohci->host->id, "Failed to allocate dma ir prg");
250                         free_dma_iso_ctx(d);
251                         return NULL;
252                 }
253
254                 d->nb_cmd = d->buf_size / PAGE_SIZE + 1;
255                 d->left_size = (d->frame_size % PAGE_SIZE) ?
256                         d->frame_size % PAGE_SIZE : PAGE_SIZE;
257
258                 for (i = 0;i < d->num_desc; i++) {
259                         if (dma_prog_region_alloc(&d->prg_reg[i], d->nb_cmd *
260                                                   sizeof(struct dma_cmd), ohci->dev)) {
261                                 PRINT(KERN_ERR, ohci->host->id, "Failed to allocate dma ir prg");
262                                 free_dma_iso_ctx(d);
263                                 return NULL;
264                         }
265                         d->ir_prg[i] = (struct dma_cmd *)d->prg_reg[i].kvirt;
266                 }
267
268         } else {  /* OHCI_ISO_TRANSMIT */
269                 d->ctrlSet = OHCI1394_IsoXmitContextControlSet+16*d->ctx;
270                 d->ctrlClear = OHCI1394_IsoXmitContextControlClear+16*d->ctx;
271                 d->cmdPtr = OHCI1394_IsoXmitCommandPtr+16*d->ctx;
272
273                 d->it_prg = kzalloc(d->num_desc * sizeof(*d->it_prg),
274                                     GFP_KERNEL);
275
276                 if (!d->it_prg) {
277                         PRINT(KERN_ERR, ohci->host->id,
278                               "Failed to allocate dma it prg");
279                         free_dma_iso_ctx(d);
280                         return NULL;
281                 }
282
283                 d->packet_size = packet_size;
284
285                 if (PAGE_SIZE % packet_size || packet_size>4096) {
286                         PRINT(KERN_ERR, ohci->host->id,
287                               "Packet size %d (page_size: %ld) "
288                               "not yet supported\n",
289                               packet_size, PAGE_SIZE);
290                         free_dma_iso_ctx(d);
291                         return NULL;
292                 }
293
294                 d->nb_cmd = d->frame_size / d->packet_size;
295                 if (d->frame_size % d->packet_size) {
296                         d->nb_cmd++;
297                         d->left_size = d->frame_size % d->packet_size;
298                 } else
299                         d->left_size = d->packet_size;
300
301                 for (i = 0; i < d->num_desc; i++) {
302                         if (dma_prog_region_alloc(&d->prg_reg[i], d->nb_cmd *
303                                                 sizeof(struct it_dma_prg), ohci->dev)) {
304                                 PRINT(KERN_ERR, ohci->host->id, "Failed to allocate dma it prg");
305                                 free_dma_iso_ctx(d);
306                                 return NULL;
307                         }
308                         d->it_prg[i] = (struct it_dma_prg *)d->prg_reg[i].kvirt;
309                 }
310         }
311
312         d->buffer_status =
313             kzalloc(d->num_desc * sizeof(*d->buffer_status), GFP_KERNEL);
314         d->buffer_prg_assignment =
315             kzalloc(d->num_desc * sizeof(*d->buffer_prg_assignment), GFP_KERNEL);
316         d->buffer_time =
317             kzalloc(d->num_desc * sizeof(*d->buffer_time), GFP_KERNEL);
318         d->last_used_cmd =
319             kzalloc(d->num_desc * sizeof(*d->last_used_cmd), GFP_KERNEL);
320         d->next_buffer =
321             kzalloc(d->num_desc * sizeof(*d->next_buffer), GFP_KERNEL);
322
323         if (!d->buffer_status || !d->buffer_prg_assignment || !d->buffer_time ||
324             !d->last_used_cmd || !d->next_buffer) {
325                 PRINT(KERN_ERR, ohci->host->id,
326                       "Failed to allocate dma_iso_ctx member");
327                 free_dma_iso_ctx(d);
328                 return NULL;
329         }
330
331         spin_lock_init(&d->lock);
332
333         DBGMSG(ohci->host->id, "Iso %s DMA: %d buffers "
334               "of size %d allocated for a frame size %d, each with %d prgs",
335               (type == OHCI_ISO_RECEIVE) ? "receive" : "transmit",
336               d->num_desc - 1, d->buf_size, d->frame_size, d->nb_cmd);
337
338         return d;
339 }
340
341 static void reset_ir_status(struct dma_iso_ctx *d, int n)
342 {
343         int i;
344         d->ir_prg[n][0].status = cpu_to_le32(4);
345         d->ir_prg[n][1].status = cpu_to_le32(PAGE_SIZE-4);
346         for (i = 2; i < d->nb_cmd - 1; i++)
347                 d->ir_prg[n][i].status = cpu_to_le32(PAGE_SIZE);
348         d->ir_prg[n][i].status = cpu_to_le32(d->left_size);
349 }
350
351 static void reprogram_dma_ir_prg(struct dma_iso_ctx *d, int n, int buffer, int flags)
352 {
353         struct dma_cmd *ir_prg = d->ir_prg[n];
354         unsigned long buf = (unsigned long)d->dma.kvirt + buffer * d->buf_size;
355         int i;
356
357         d->buffer_prg_assignment[n] = buffer;
358
359         ir_prg[0].address = cpu_to_le32(dma_region_offset_to_bus(&d->dma, buf -
360                                 (unsigned long)d->dma.kvirt));
361         ir_prg[1].address = cpu_to_le32(dma_region_offset_to_bus(&d->dma,
362                                 (buf + 4) - (unsigned long)d->dma.kvirt));
363
364         for (i=2;i<d->nb_cmd-1;i++) {
365                 ir_prg[i].address = cpu_to_le32(dma_region_offset_to_bus(&d->dma,
366                                                 (buf+(i-1)*PAGE_SIZE) -
367                                                 (unsigned long)d->dma.kvirt));
368         }
369
370         ir_prg[i].control = cpu_to_le32(DMA_CTL_INPUT_MORE | DMA_CTL_UPDATE |
371                                   DMA_CTL_IRQ | DMA_CTL_BRANCH | d->left_size);
372         ir_prg[i].address = cpu_to_le32(dma_region_offset_to_bus(&d->dma,
373                                   (buf+(i-1)*PAGE_SIZE) - (unsigned long)d->dma.kvirt));
374 }
375
376 static void initialize_dma_ir_prg(struct dma_iso_ctx *d, int n, int flags)
377 {
378         struct dma_cmd *ir_prg = d->ir_prg[n];
379         struct dma_prog_region *ir_reg = &d->prg_reg[n];
380         unsigned long buf = (unsigned long)d->dma.kvirt;
381         int i;
382
383         /* the first descriptor will read only 4 bytes */
384         ir_prg[0].control = cpu_to_le32(DMA_CTL_INPUT_MORE | DMA_CTL_UPDATE |
385                 DMA_CTL_BRANCH | 4);
386
387         /* set the sync flag */
388         if (flags & VIDEO1394_SYNC_FRAMES)
389                 ir_prg[0].control |= cpu_to_le32(DMA_CTL_WAIT);
390
391         ir_prg[0].address = cpu_to_le32(dma_region_offset_to_bus(&d->dma, buf -
392                                 (unsigned long)d->dma.kvirt));
393         ir_prg[0].branchAddress = cpu_to_le32((dma_prog_region_offset_to_bus(ir_reg,
394                                         1 * sizeof(struct dma_cmd)) & 0xfffffff0) | 0x1);
395
396         /* If there is *not* only one DMA page per frame (hence, d->nb_cmd==2) */
397         if (d->nb_cmd > 2) {
398                 /* The second descriptor will read PAGE_SIZE-4 bytes */
399                 ir_prg[1].control = cpu_to_le32(DMA_CTL_INPUT_MORE | DMA_CTL_UPDATE |
400                                                 DMA_CTL_BRANCH | (PAGE_SIZE-4));
401                 ir_prg[1].address = cpu_to_le32(dma_region_offset_to_bus(&d->dma, (buf + 4) -
402                                                 (unsigned long)d->dma.kvirt));
403                 ir_prg[1].branchAddress = cpu_to_le32((dma_prog_region_offset_to_bus(ir_reg,
404                                                       2 * sizeof(struct dma_cmd)) & 0xfffffff0) | 0x1);
405
406                 for (i = 2; i < d->nb_cmd - 1; i++) {
407                         ir_prg[i].control = cpu_to_le32(DMA_CTL_INPUT_MORE | DMA_CTL_UPDATE |
408                                                         DMA_CTL_BRANCH | PAGE_SIZE);
409                         ir_prg[i].address = cpu_to_le32(dma_region_offset_to_bus(&d->dma,
410                                                         (buf+(i-1)*PAGE_SIZE) -
411                                                         (unsigned long)d->dma.kvirt));
412
413                         ir_prg[i].branchAddress =
414                                 cpu_to_le32((dma_prog_region_offset_to_bus(ir_reg,
415                                             (i + 1) * sizeof(struct dma_cmd)) & 0xfffffff0) | 0x1);
416                 }
417
418                 /* The last descriptor will generate an interrupt */
419                 ir_prg[i].control = cpu_to_le32(DMA_CTL_INPUT_MORE | DMA_CTL_UPDATE |
420                                                 DMA_CTL_IRQ | DMA_CTL_BRANCH | d->left_size);
421                 ir_prg[i].address = cpu_to_le32(dma_region_offset_to_bus(&d->dma,
422                                                 (buf+(i-1)*PAGE_SIZE) -
423                                                 (unsigned long)d->dma.kvirt));
424         } else {
425                 /* Only one DMA page is used. Read d->left_size immediately and */
426                 /* generate an interrupt as this is also the last page. */
427                 ir_prg[1].control = cpu_to_le32(DMA_CTL_INPUT_MORE | DMA_CTL_UPDATE |
428                                                 DMA_CTL_IRQ | DMA_CTL_BRANCH | (d->left_size-4));
429                 ir_prg[1].address = cpu_to_le32(dma_region_offset_to_bus(&d->dma,
430                                                 (buf + 4) - (unsigned long)d->dma.kvirt));
431         }
432 }
433
434 static void initialize_dma_ir_ctx(struct dma_iso_ctx *d, int tag, int flags)
435 {
436         struct ti_ohci *ohci = (struct ti_ohci *)d->ohci;
437         int i;
438
439         d->flags = flags;
440
441         ohci1394_stop_context(ohci, d->ctrlClear, NULL);
442
443         for (i=0;i<d->num_desc;i++) {
444                 initialize_dma_ir_prg(d, i, flags);
445                 reset_ir_status(d, i);
446         }
447
448         /* reset the ctrl register */
449         reg_write(ohci, d->ctrlClear, 0xf0000000);
450
451         /* Set bufferFill */
452         reg_write(ohci, d->ctrlSet, 0x80000000);
453
454         /* Set isoch header */
455         if (flags & VIDEO1394_INCLUDE_ISO_HEADERS)
456                 reg_write(ohci, d->ctrlSet, 0x40000000);
457
458         /* Set the context match register to match on all tags,
459            sync for sync tag, and listen to d->channel */
460         reg_write(ohci, d->ctxMatch, 0xf0000000|((tag&0xf)<<8)|d->channel);
461
462         /* Set up isoRecvIntMask to generate interrupts */
463         reg_write(ohci, OHCI1394_IsoRecvIntMaskSet, 1<<d->ctx);
464 }
465
466 /* find which context is listening to this channel */
467 static struct dma_iso_ctx *
468 find_ctx(struct list_head *list, int type, int channel)
469 {
470         struct dma_iso_ctx *ctx;
471
472         list_for_each_entry(ctx, list, link) {
473                 if (ctx->type == type && ctx->channel == channel)
474                         return ctx;
475         }
476
477         return NULL;
478 }
479
480 static void wakeup_dma_ir_ctx(unsigned long l)
481 {
482         struct dma_iso_ctx *d = (struct dma_iso_ctx *) l;
483         int i;
484
485         spin_lock(&d->lock);
486
487         for (i = 0; i < d->num_desc; i++) {
488                 if (d->ir_prg[i][d->nb_cmd-1].status & cpu_to_le32(0xFFFF0000)) {
489                         reset_ir_status(d, i);
490                         d->buffer_status[d->buffer_prg_assignment[i]] = VIDEO1394_BUFFER_READY;
491                         do_gettimeofday(&d->buffer_time[d->buffer_prg_assignment[i]]);
492                 }
493         }
494
495         spin_unlock(&d->lock);
496
497         if (waitqueue_active(&d->waitq))
498                 wake_up_interruptible(&d->waitq);
499 }
500
501 static inline void put_timestamp(struct ti_ohci *ohci, struct dma_iso_ctx * d,
502                                  int n)
503 {
504         unsigned char* buf = d->dma.kvirt + n * d->buf_size;
505         u32 cycleTimer;
506         u32 timeStamp;
507
508         if (n == -1) {
509           return;
510         }
511
512         cycleTimer = reg_read(ohci, OHCI1394_IsochronousCycleTimer);
513
514         timeStamp = ((cycleTimer & 0x0fff) + d->syt_offset); /* 11059 = 450 us */
515         timeStamp = (timeStamp % 3072 + ((timeStamp / 3072) << 12)
516                 + (cycleTimer & 0xf000)) & 0xffff;
517
518         buf[6] = timeStamp >> 8;
519         buf[7] = timeStamp & 0xff;
520
521     /* if first packet is empty packet, then put timestamp into the next full one too */
522     if ( (le32_to_cpu(d->it_prg[n][0].data[1]) >>16) == 0x008) {
523             buf += d->packet_size;
524         buf[6] = timeStamp >> 8;
525             buf[7] = timeStamp & 0xff;
526         }
527
528     /* do the next buffer frame too in case of irq latency */
529         n = d->next_buffer[n];
530         if (n == -1) {
531           return;
532         }
533         buf = d->dma.kvirt + n * d->buf_size;
534
535         timeStamp += (d->last_used_cmd[n] << 12) & 0xffff;
536
537         buf[6] = timeStamp >> 8;
538         buf[7] = timeStamp & 0xff;
539
540     /* if first packet is empty packet, then put timestamp into the next full one too */
541     if ( (le32_to_cpu(d->it_prg[n][0].data[1]) >>16) == 0x008) {
542             buf += d->packet_size;
543         buf[6] = timeStamp >> 8;
544             buf[7] = timeStamp & 0xff;
545         }
546
547 #if 0
548         printk("curr: %d, next: %d, cycleTimer: %08x timeStamp: %08x\n",
549                curr, n, cycleTimer, timeStamp);
550 #endif
551 }
552
553 static void wakeup_dma_it_ctx(unsigned long l)
554 {
555         struct dma_iso_ctx *d = (struct dma_iso_ctx *) l;
556         struct ti_ohci *ohci = d->ohci;
557         int i;
558
559         spin_lock(&d->lock);
560
561         for (i = 0; i < d->num_desc; i++) {
562                 if (d->it_prg[i][d->last_used_cmd[i]].end.status &
563                     cpu_to_le32(0xFFFF0000)) {
564                         int next = d->next_buffer[i];
565                         put_timestamp(ohci, d, next);
566                         d->it_prg[i][d->last_used_cmd[i]].end.status = 0;
567                         d->buffer_status[d->buffer_prg_assignment[i]] = VIDEO1394_BUFFER_READY;
568                 }
569         }
570
571         spin_unlock(&d->lock);
572
573         if (waitqueue_active(&d->waitq))
574                 wake_up_interruptible(&d->waitq);
575 }
576
577 static void reprogram_dma_it_prg(struct dma_iso_ctx  *d, int n, int buffer)
578 {
579         struct it_dma_prg *it_prg = d->it_prg[n];
580         unsigned long buf = (unsigned long)d->dma.kvirt + buffer * d->buf_size;
581         int i;
582
583         d->buffer_prg_assignment[n] = buffer;
584         for (i=0;i<d->nb_cmd;i++) {
585           it_prg[i].end.address =
586                 cpu_to_le32(dma_region_offset_to_bus(&d->dma,
587                         (buf+i*d->packet_size) - (unsigned long)d->dma.kvirt));
588         }
589 }
590
591 static void initialize_dma_it_prg(struct dma_iso_ctx *d, int n, int sync_tag)
592 {
593         struct it_dma_prg *it_prg = d->it_prg[n];
594         struct dma_prog_region *it_reg = &d->prg_reg[n];
595         unsigned long buf = (unsigned long)d->dma.kvirt;
596         int i;
597         d->last_used_cmd[n] = d->nb_cmd - 1;
598         for (i=0;i<d->nb_cmd;i++) {
599
600                 it_prg[i].begin.control = cpu_to_le32(DMA_CTL_OUTPUT_MORE |
601                         DMA_CTL_IMMEDIATE | 8) ;
602                 it_prg[i].begin.address = 0;
603
604                 it_prg[i].begin.status = 0;
605
606                 it_prg[i].data[0] = cpu_to_le32(
607                         (IEEE1394_SPEED_100 << 16)
608                         | (/* tag */ 1 << 14)
609                         | (d->channel << 8)
610                         | (TCODE_ISO_DATA << 4));
611                 if (i==0) it_prg[i].data[0] |= cpu_to_le32(sync_tag);
612                 it_prg[i].data[1] = cpu_to_le32(d->packet_size << 16);
613                 it_prg[i].data[2] = 0;
614                 it_prg[i].data[3] = 0;
615
616                 it_prg[i].end.control = cpu_to_le32(DMA_CTL_OUTPUT_LAST |
617                                              DMA_CTL_BRANCH);
618                 it_prg[i].end.address =
619                         cpu_to_le32(dma_region_offset_to_bus(&d->dma, (buf+i*d->packet_size) -
620                                                 (unsigned long)d->dma.kvirt));
621
622                 if (i<d->nb_cmd-1) {
623                         it_prg[i].end.control |= cpu_to_le32(d->packet_size);
624                         it_prg[i].begin.branchAddress =
625                                 cpu_to_le32((dma_prog_region_offset_to_bus(it_reg, (i + 1) *
626                                         sizeof(struct it_dma_prg)) & 0xfffffff0) | 0x3);
627                         it_prg[i].end.branchAddress =
628                                 cpu_to_le32((dma_prog_region_offset_to_bus(it_reg, (i + 1) *
629                                         sizeof(struct it_dma_prg)) & 0xfffffff0) | 0x3);
630                 } else {
631                         /* the last prg generates an interrupt */
632                         it_prg[i].end.control |= cpu_to_le32(DMA_CTL_UPDATE |
633                                 DMA_CTL_IRQ | d->left_size);
634                         /* the last prg doesn't branch */
635                         it_prg[i].begin.branchAddress = 0;
636                         it_prg[i].end.branchAddress = 0;
637                 }
638                 it_prg[i].end.status = 0;
639         }
640 }
641
642 static void initialize_dma_it_prg_var_packet_queue(
643         struct dma_iso_ctx *d, int n, unsigned int * packet_sizes,
644         struct ti_ohci *ohci)
645 {
646         struct it_dma_prg *it_prg = d->it_prg[n];
647         struct dma_prog_region *it_reg = &d->prg_reg[n];
648         int i;
649
650 #if 0
651         if (n != -1) {
652                 put_timestamp(ohci, d, n);
653         }
654 #endif
655         d->last_used_cmd[n] = d->nb_cmd - 1;
656
657         for (i = 0; i < d->nb_cmd; i++) {
658                 unsigned int size;
659                 if (packet_sizes[i] > d->packet_size) {
660                         size = d->packet_size;
661                 } else {
662                         size = packet_sizes[i];
663                 }
664                 it_prg[i].data[1] = cpu_to_le32(size << 16);
665                 it_prg[i].end.control = cpu_to_le32(DMA_CTL_OUTPUT_LAST | DMA_CTL_BRANCH);
666
667                 if (i < d->nb_cmd-1 && packet_sizes[i+1] != 0) {
668                         it_prg[i].end.control |= cpu_to_le32(size);
669                         it_prg[i].begin.branchAddress =
670                                 cpu_to_le32((dma_prog_region_offset_to_bus(it_reg, (i + 1) *
671                                         sizeof(struct it_dma_prg)) & 0xfffffff0) | 0x3);
672                         it_prg[i].end.branchAddress =
673                                 cpu_to_le32((dma_prog_region_offset_to_bus(it_reg, (i + 1) *
674                                         sizeof(struct it_dma_prg)) & 0xfffffff0) | 0x3);
675                 } else {
676                         /* the last prg generates an interrupt */
677                         it_prg[i].end.control |= cpu_to_le32(DMA_CTL_UPDATE |
678                                 DMA_CTL_IRQ | size);
679                         /* the last prg doesn't branch */
680                         it_prg[i].begin.branchAddress = 0;
681                         it_prg[i].end.branchAddress = 0;
682                         d->last_used_cmd[n] = i;
683                         break;
684                 }
685         }
686 }
687
688 static void initialize_dma_it_ctx(struct dma_iso_ctx *d, int sync_tag,
689                                   unsigned int syt_offset, int flags)
690 {
691         struct ti_ohci *ohci = (struct ti_ohci *)d->ohci;
692         int i;
693
694         d->flags = flags;
695         d->syt_offset = (syt_offset == 0 ? 11000 : syt_offset);
696
697         ohci1394_stop_context(ohci, d->ctrlClear, NULL);
698
699         for (i=0;i<d->num_desc;i++)
700                 initialize_dma_it_prg(d, i, sync_tag);
701
702         /* Set up isoRecvIntMask to generate interrupts */
703         reg_write(ohci, OHCI1394_IsoXmitIntMaskSet, 1<<d->ctx);
704 }
705
706 static inline unsigned video1394_buffer_state(struct dma_iso_ctx *d,
707                                               unsigned int buffer)
708 {
709         unsigned long flags;
710         unsigned int ret;
711         spin_lock_irqsave(&d->lock, flags);
712         ret = d->buffer_status[buffer];
713         spin_unlock_irqrestore(&d->lock, flags);
714         return ret;
715 }
716
717 static int __video1394_ioctl(struct file *file,
718                              unsigned int cmd, unsigned long arg)
719 {
720         struct file_ctx *ctx = (struct file_ctx *)file->private_data;
721         struct ti_ohci *ohci = ctx->ohci;
722         unsigned long flags;
723         void __user *argp = (void __user *)arg;
724
725         switch(cmd)
726         {
727         case VIDEO1394_IOC_LISTEN_CHANNEL:
728         case VIDEO1394_IOC_TALK_CHANNEL:
729         {
730                 struct video1394_mmap v;
731                 u64 mask;
732                 struct dma_iso_ctx *d;
733                 int i;
734
735                 if (copy_from_user(&v, argp, sizeof(v)))
736                         return -EFAULT;
737
738                 /* if channel < 0, find lowest available one */
739                 if (v.channel < 0) {
740                     mask = (u64)0x1;
741                     for (i=0; ; i++) {
742                         if (i == ISO_CHANNELS) {
743                             PRINT(KERN_ERR, ohci->host->id, 
744                                   "No free channel found");
745                             return -EAGAIN;
746                         }
747                         if (!(ohci->ISO_channel_usage & mask)) {
748                             v.channel = i;
749                             PRINT(KERN_INFO, ohci->host->id, "Found free channel %d", i);
750                             break;
751                         }
752                         mask = mask << 1;
753                     }
754                 } else if (v.channel >= ISO_CHANNELS) {
755                         PRINT(KERN_ERR, ohci->host->id,
756                               "Iso channel %d out of bounds", v.channel);
757                         return -EINVAL;
758                 } else {
759                         mask = (u64)0x1<<v.channel;
760                 }
761                 DBGMSG(ohci->host->id, "mask: %08X%08X usage: %08X%08X\n",
762                         (u32)(mask>>32),(u32)(mask&0xffffffff),
763                         (u32)(ohci->ISO_channel_usage>>32),
764                         (u32)(ohci->ISO_channel_usage&0xffffffff));
765                 if (ohci->ISO_channel_usage & mask) {
766                         PRINT(KERN_ERR, ohci->host->id,
767                               "Channel %d is already taken", v.channel);
768                         return -EBUSY;
769                 }
770
771                 if (v.buf_size == 0 || v.buf_size > VIDEO1394_MAX_SIZE) {
772                         PRINT(KERN_ERR, ohci->host->id,
773                               "Invalid %d length buffer requested",v.buf_size);
774                         return -EINVAL;
775                 }
776
777                 if (v.nb_buffers == 0 || v.nb_buffers > VIDEO1394_MAX_SIZE) {
778                         PRINT(KERN_ERR, ohci->host->id,
779                               "Invalid %d buffers requested",v.nb_buffers);
780                         return -EINVAL;
781                 }
782
783                 if (v.nb_buffers * v.buf_size > VIDEO1394_MAX_SIZE) {
784                         PRINT(KERN_ERR, ohci->host->id,
785                               "%d buffers of size %d bytes is too big",
786                               v.nb_buffers, v.buf_size);
787                         return -EINVAL;
788                 }
789
790                 if (cmd == VIDEO1394_IOC_LISTEN_CHANNEL) {
791                         d = alloc_dma_iso_ctx(ohci, OHCI_ISO_RECEIVE,
792                                               v.nb_buffers + 1, v.buf_size,
793                                               v.channel, 0);
794
795                         if (d == NULL) {
796                                 PRINT(KERN_ERR, ohci->host->id,
797                                       "Couldn't allocate ir context");
798                                 return -EAGAIN;
799                         }
800                         initialize_dma_ir_ctx(d, v.sync_tag, v.flags);
801
802                         ctx->current_ctx = d;
803
804                         v.buf_size = d->buf_size;
805                         list_add_tail(&d->link, &ctx->context_list);
806
807                         DBGMSG(ohci->host->id,
808                               "iso context %d listen on channel %d",
809                               d->ctx, v.channel);
810                 }
811                 else {
812                         d = alloc_dma_iso_ctx(ohci, OHCI_ISO_TRANSMIT,
813                                               v.nb_buffers + 1, v.buf_size,
814                                               v.channel, v.packet_size);
815
816                         if (d == NULL) {
817                                 PRINT(KERN_ERR, ohci->host->id,
818                                       "Couldn't allocate it context");
819                                 return -EAGAIN;
820                         }
821                         initialize_dma_it_ctx(d, v.sync_tag,
822                                               v.syt_offset, v.flags);
823
824                         ctx->current_ctx = d;
825
826                         v.buf_size = d->buf_size;
827
828                         list_add_tail(&d->link, &ctx->context_list);
829
830                         DBGMSG(ohci->host->id,
831                               "Iso context %d talk on channel %d", d->ctx,
832                               v.channel);
833                 }
834
835                 if (copy_to_user(argp, &v, sizeof(v))) {
836                         /* FIXME : free allocated dma resources */
837                         return -EFAULT;
838                 }
839                 
840                 ohci->ISO_channel_usage |= mask;
841
842                 return 0;
843         }
844         case VIDEO1394_IOC_UNLISTEN_CHANNEL:
845         case VIDEO1394_IOC_UNTALK_CHANNEL:
846         {
847                 int channel;
848                 u64 mask;
849                 struct dma_iso_ctx *d;
850
851                 if (copy_from_user(&channel, argp, sizeof(int)))
852                         return -EFAULT;
853
854                 if (channel < 0 || channel >= ISO_CHANNELS) {
855                         PRINT(KERN_ERR, ohci->host->id,
856                               "Iso channel %d out of bound", channel);
857                         return -EINVAL;
858                 }
859                 mask = (u64)0x1<<channel;
860                 if (!(ohci->ISO_channel_usage & mask)) {
861                         PRINT(KERN_ERR, ohci->host->id,
862                               "Channel %d is not being used", channel);
863                         return -ESRCH;
864                 }
865
866                 /* Mark this channel as unused */
867                 ohci->ISO_channel_usage &= ~mask;
868
869                 if (cmd == VIDEO1394_IOC_UNLISTEN_CHANNEL)
870                         d = find_ctx(&ctx->context_list, OHCI_ISO_RECEIVE, channel);
871                 else
872                         d = find_ctx(&ctx->context_list, OHCI_ISO_TRANSMIT, channel);
873
874                 if (d == NULL) return -ESRCH;
875                 DBGMSG(ohci->host->id, "Iso context %d "
876                       "stop talking on channel %d", d->ctx, channel);
877                 free_dma_iso_ctx(d);
878
879                 return 0;
880         }
881         case VIDEO1394_IOC_LISTEN_QUEUE_BUFFER:
882         {
883                 struct video1394_wait v;
884                 struct dma_iso_ctx *d;
885                 int next_prg;
886
887                 if (copy_from_user(&v, argp, sizeof(v)))
888                         return -EFAULT;
889
890                 d = find_ctx(&ctx->context_list, OHCI_ISO_RECEIVE, v.channel);
891                 if (d == NULL) return -EFAULT;
892
893                 if ((v.buffer<0) || (v.buffer>=d->num_desc - 1)) {
894                         PRINT(KERN_ERR, ohci->host->id,
895                               "Buffer %d out of range",v.buffer);
896                         return -EINVAL;
897                 }
898
899                 spin_lock_irqsave(&d->lock,flags);
900
901                 if (d->buffer_status[v.buffer]==VIDEO1394_BUFFER_QUEUED) {
902                         PRINT(KERN_ERR, ohci->host->id,
903                               "Buffer %d is already used",v.buffer);
904                         spin_unlock_irqrestore(&d->lock,flags);
905                         return -EBUSY;
906                 }
907
908                 d->buffer_status[v.buffer]=VIDEO1394_BUFFER_QUEUED;
909
910                 next_prg = (d->last_buffer + 1) % d->num_desc;
911                 if (d->last_buffer>=0)
912                         d->ir_prg[d->last_buffer][d->nb_cmd-1].branchAddress =
913                                 cpu_to_le32((dma_prog_region_offset_to_bus(&d->prg_reg[next_prg], 0)
914                                         & 0xfffffff0) | 0x1);
915
916                 d->last_buffer = next_prg;
917                 reprogram_dma_ir_prg(d, d->last_buffer, v.buffer, d->flags);
918
919                 d->ir_prg[d->last_buffer][d->nb_cmd-1].branchAddress = 0;
920
921                 spin_unlock_irqrestore(&d->lock,flags);
922
923                 if (!(reg_read(ohci, d->ctrlSet) & 0x8000))
924                 {
925                         DBGMSG(ohci->host->id, "Starting iso DMA ctx=%d",d->ctx);
926
927                         /* Tell the controller where the first program is */
928                         reg_write(ohci, d->cmdPtr,
929                                   dma_prog_region_offset_to_bus(&d->prg_reg[d->last_buffer], 0) | 0x1);
930
931                         /* Run IR context */
932                         reg_write(ohci, d->ctrlSet, 0x8000);
933                 }
934                 else {
935                         /* Wake up dma context if necessary */
936                         if (!(reg_read(ohci, d->ctrlSet) & 0x400)) {
937                                 DBGMSG(ohci->host->id,
938                                       "Waking up iso dma ctx=%d", d->ctx);
939                                 reg_write(ohci, d->ctrlSet, 0x1000);
940                         }
941                 }
942                 return 0;
943
944         }
945         case VIDEO1394_IOC_LISTEN_WAIT_BUFFER:
946         case VIDEO1394_IOC_LISTEN_POLL_BUFFER:
947         {
948                 struct video1394_wait v;
949                 struct dma_iso_ctx *d;
950                 int i = 0;
951
952                 if (copy_from_user(&v, argp, sizeof(v)))
953                         return -EFAULT;
954
955                 d = find_ctx(&ctx->context_list, OHCI_ISO_RECEIVE, v.channel);
956                 if (d == NULL) return -EFAULT;
957
958                 if ((v.buffer<0) || (v.buffer>d->num_desc - 1)) {
959                         PRINT(KERN_ERR, ohci->host->id,
960                               "Buffer %d out of range",v.buffer);
961                         return -EINVAL;
962                 }
963
964                 /*
965                  * I change the way it works so that it returns
966                  * the last received frame.
967                  */
968                 spin_lock_irqsave(&d->lock, flags);
969                 switch(d->buffer_status[v.buffer]) {
970                 case VIDEO1394_BUFFER_READY:
971                         d->buffer_status[v.buffer]=VIDEO1394_BUFFER_FREE;
972                         break;
973                 case VIDEO1394_BUFFER_QUEUED:
974                         if (cmd == VIDEO1394_IOC_LISTEN_POLL_BUFFER) {
975                             /* for polling, return error code EINTR */
976                             spin_unlock_irqrestore(&d->lock, flags);
977                             return -EINTR;
978                         }
979
980                         spin_unlock_irqrestore(&d->lock, flags);
981                         wait_event_interruptible(d->waitq,
982                                         video1394_buffer_state(d, v.buffer) ==
983                                          VIDEO1394_BUFFER_READY);
984                         if (signal_pending(current))
985                                 return -EINTR;
986                         spin_lock_irqsave(&d->lock, flags);
987                         d->buffer_status[v.buffer]=VIDEO1394_BUFFER_FREE;
988                         break;
989                 default:
990                         PRINT(KERN_ERR, ohci->host->id,
991                               "Buffer %d is not queued",v.buffer);
992                         spin_unlock_irqrestore(&d->lock, flags);
993                         return -ESRCH;
994                 }
995
996                 /* set time of buffer */
997                 v.filltime = d->buffer_time[v.buffer];
998
999                 /*
1000                  * Look ahead to see how many more buffers have been received
1001                  */
1002                 i=0;
1003                 while (d->buffer_status[(v.buffer+1)%(d->num_desc - 1)]==
1004                        VIDEO1394_BUFFER_READY) {
1005                         v.buffer=(v.buffer+1)%(d->num_desc - 1);
1006                         i++;
1007                 }
1008                 spin_unlock_irqrestore(&d->lock, flags);
1009
1010                 v.buffer=i;
1011                 if (copy_to_user(argp, &v, sizeof(v)))
1012                         return -EFAULT;
1013
1014                 return 0;
1015         }
1016         case VIDEO1394_IOC_TALK_QUEUE_BUFFER:
1017         {
1018                 struct video1394_wait v;
1019                 unsigned int *psizes = NULL;
1020                 struct dma_iso_ctx *d;
1021                 int next_prg;
1022
1023                 if (copy_from_user(&v, argp, sizeof(v)))
1024                         return -EFAULT;
1025
1026                 d = find_ctx(&ctx->context_list, OHCI_ISO_TRANSMIT, v.channel);
1027                 if (d == NULL) return -EFAULT;
1028
1029                 if ((v.buffer<0) || (v.buffer>=d->num_desc - 1)) {
1030                         PRINT(KERN_ERR, ohci->host->id,
1031                               "Buffer %d out of range",v.buffer);
1032                         return -EINVAL;
1033                 }
1034
1035                 if (d->flags & VIDEO1394_VARIABLE_PACKET_SIZE) {
1036                         int buf_size = d->nb_cmd * sizeof(*psizes);
1037                         struct video1394_queue_variable __user *p = argp;
1038                         unsigned int __user *qv;
1039
1040                         if (get_user(qv, &p->packet_sizes))
1041                                 return -EFAULT;
1042
1043                         psizes = kmalloc(buf_size, GFP_KERNEL);
1044                         if (!psizes)
1045                                 return -ENOMEM;
1046
1047                         if (copy_from_user(psizes, qv, buf_size)) {
1048                                 kfree(psizes);
1049                                 return -EFAULT;
1050                         }
1051                 }
1052
1053                 spin_lock_irqsave(&d->lock,flags);
1054
1055                 /* last_buffer is last_prg */
1056                 next_prg = (d->last_buffer + 1) % d->num_desc;
1057                 if (d->buffer_status[v.buffer]!=VIDEO1394_BUFFER_FREE) {
1058                         PRINT(KERN_ERR, ohci->host->id,
1059                               "Buffer %d is already used",v.buffer);
1060                         spin_unlock_irqrestore(&d->lock,flags);
1061                         kfree(psizes);
1062                         return -EBUSY;
1063                 }
1064
1065                 if (d->flags & VIDEO1394_VARIABLE_PACKET_SIZE) {
1066                         initialize_dma_it_prg_var_packet_queue(
1067                                 d, next_prg, psizes, ohci);
1068                 }
1069
1070                 d->buffer_status[v.buffer]=VIDEO1394_BUFFER_QUEUED;
1071
1072                 if (d->last_buffer >= 0) {
1073                         d->it_prg[d->last_buffer]
1074                                 [ d->last_used_cmd[d->last_buffer] ].end.branchAddress =
1075                                         cpu_to_le32((dma_prog_region_offset_to_bus(&d->prg_reg[next_prg],
1076                                                 0) & 0xfffffff0) | 0x3);
1077
1078                         d->it_prg[d->last_buffer]
1079                                 [ d->last_used_cmd[d->last_buffer] ].begin.branchAddress =
1080                                         cpu_to_le32((dma_prog_region_offset_to_bus(&d->prg_reg[next_prg],
1081                                                 0) & 0xfffffff0) | 0x3);
1082                         d->next_buffer[d->last_buffer] = (v.buffer + 1) % (d->num_desc - 1);
1083                 }
1084                 d->last_buffer = next_prg;
1085                 reprogram_dma_it_prg(d, d->last_buffer, v.buffer);
1086                 d->next_buffer[d->last_buffer] = -1;
1087
1088                 d->it_prg[d->last_buffer][d->last_used_cmd[d->last_buffer]].end.branchAddress = 0;
1089
1090                 spin_unlock_irqrestore(&d->lock,flags);
1091
1092                 if (!(reg_read(ohci, d->ctrlSet) & 0x8000))
1093                 {
1094                         DBGMSG(ohci->host->id, "Starting iso transmit DMA ctx=%d",
1095                                d->ctx);
1096                         put_timestamp(ohci, d, d->last_buffer);
1097
1098                         /* Tell the controller where the first program is */
1099                         reg_write(ohci, d->cmdPtr,
1100                                 dma_prog_region_offset_to_bus(&d->prg_reg[next_prg], 0) | 0x3);
1101
1102                         /* Run IT context */
1103                         reg_write(ohci, d->ctrlSet, 0x8000);
1104                 }
1105                 else {
1106                         /* Wake up dma context if necessary */
1107                         if (!(reg_read(ohci, d->ctrlSet) & 0x400)) {
1108                                 DBGMSG(ohci->host->id,
1109                                       "Waking up iso transmit dma ctx=%d",
1110                                       d->ctx);
1111                                 put_timestamp(ohci, d, d->last_buffer);
1112                                 reg_write(ohci, d->ctrlSet, 0x1000);
1113                         }
1114                 }
1115
1116                 kfree(psizes);
1117                 return 0;
1118
1119         }
1120         case VIDEO1394_IOC_TALK_WAIT_BUFFER:
1121         {
1122                 struct video1394_wait v;
1123                 struct dma_iso_ctx *d;
1124
1125                 if (copy_from_user(&v, argp, sizeof(v)))
1126                         return -EFAULT;
1127
1128                 d = find_ctx(&ctx->context_list, OHCI_ISO_TRANSMIT, v.channel);
1129                 if (d == NULL) return -EFAULT;
1130
1131                 if ((v.buffer<0) || (v.buffer>=d->num_desc-1)) {
1132                         PRINT(KERN_ERR, ohci->host->id,
1133                               "Buffer %d out of range",v.buffer);
1134                         return -EINVAL;
1135                 }
1136
1137                 switch(d->buffer_status[v.buffer]) {
1138                 case VIDEO1394_BUFFER_READY:
1139                         d->buffer_status[v.buffer]=VIDEO1394_BUFFER_FREE;
1140                         return 0;
1141                 case VIDEO1394_BUFFER_QUEUED:
1142                         wait_event_interruptible(d->waitq,
1143                                         (d->buffer_status[v.buffer] == VIDEO1394_BUFFER_READY));
1144                         if (signal_pending(current))
1145                                 return -EINTR;
1146                         d->buffer_status[v.buffer]=VIDEO1394_BUFFER_FREE;
1147                         return 0;
1148                 default:
1149                         PRINT(KERN_ERR, ohci->host->id,
1150                               "Buffer %d is not queued",v.buffer);
1151                         return -ESRCH;
1152                 }
1153         }
1154         default:
1155                 return -ENOTTY;
1156         }
1157 }
1158
1159 static long video1394_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1160 {
1161         int err;
1162         lock_kernel();
1163         err = __video1394_ioctl(file, cmd, arg);
1164         unlock_kernel();
1165         return err;
1166 }
1167
1168 /*
1169  *      This maps the vmalloced and reserved buffer to user space.
1170  *
1171  *  FIXME:
1172  *  - PAGE_READONLY should suffice!?
1173  *  - remap_pfn_range is kind of inefficient for page by page remapping.
1174  *    But e.g. pte_alloc() does not work in modules ... :-(
1175  */
1176
1177 static int video1394_mmap(struct file *file, struct vm_area_struct *vma)
1178 {
1179         struct file_ctx *ctx = (struct file_ctx *)file->private_data;
1180         int res = -EINVAL;
1181
1182         lock_kernel();
1183         if (ctx->current_ctx == NULL) {
1184                 PRINT(KERN_ERR, ctx->ohci->host->id,
1185                                 "Current iso context not set");
1186         } else
1187                 res = dma_region_mmap(&ctx->current_ctx->dma, file, vma);
1188         unlock_kernel();
1189
1190         return res;
1191 }
1192
1193 static unsigned int video1394_poll(struct file *file, poll_table *pt)
1194 {
1195         struct file_ctx *ctx;
1196         unsigned int mask = 0;
1197         unsigned long flags;
1198         struct dma_iso_ctx *d;
1199         int i;
1200
1201         lock_kernel();
1202         ctx = file->private_data;
1203         d = ctx->current_ctx;
1204         if (d == NULL) {
1205                 PRINT(KERN_ERR, ctx->ohci->host->id,
1206                                 "Current iso context not set");
1207                 mask = POLLERR;
1208                 goto done;
1209         }
1210
1211         poll_wait(file, &d->waitq, pt);
1212
1213         spin_lock_irqsave(&d->lock, flags);
1214         for (i = 0; i < d->num_desc; i++) {
1215                 if (d->buffer_status[i] == VIDEO1394_BUFFER_READY) {
1216                         mask |= POLLIN | POLLRDNORM;
1217                         break;
1218                 }
1219         }
1220         spin_unlock_irqrestore(&d->lock, flags);
1221 done:
1222         unlock_kernel();
1223
1224         return mask;
1225 }
1226
1227 static int video1394_open(struct inode *inode, struct file *file)
1228 {
1229         int i = ieee1394_file_to_instance(file);
1230         struct ti_ohci *ohci;
1231         struct file_ctx *ctx;
1232
1233         ohci = hpsb_get_hostinfo_bykey(&video1394_highlevel, i);
1234         if (ohci == NULL)
1235                 return -EIO;
1236
1237         ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
1238         if (!ctx)  {
1239                 PRINT(KERN_ERR, ohci->host->id, "Cannot malloc file_ctx");
1240                 return -ENOMEM;
1241         }
1242
1243         ctx->ohci = ohci;
1244         INIT_LIST_HEAD(&ctx->context_list);
1245         ctx->current_ctx = NULL;
1246         file->private_data = ctx;
1247
1248         return 0;
1249 }
1250
1251 static int video1394_release(struct inode *inode, struct file *file)
1252 {
1253         struct file_ctx *ctx = (struct file_ctx *)file->private_data;
1254         struct ti_ohci *ohci = ctx->ohci;
1255         struct list_head *lh, *next;
1256         u64 mask;
1257
1258         lock_kernel();
1259         list_for_each_safe(lh, next, &ctx->context_list) {
1260                 struct dma_iso_ctx *d;
1261                 d = list_entry(lh, struct dma_iso_ctx, link);
1262                 mask = (u64) 1 << d->channel;
1263
1264                 if (!(ohci->ISO_channel_usage & mask))
1265                         PRINT(KERN_ERR, ohci->host->id, "On release: Channel %d "
1266                               "is not being used", d->channel);
1267                 else
1268                         ohci->ISO_channel_usage &= ~mask;
1269                 DBGMSG(ohci->host->id, "On release: Iso %s context "
1270                       "%d stop listening on channel %d",
1271                       d->type == OHCI_ISO_RECEIVE ? "receive" : "transmit",
1272                       d->ctx, d->channel);
1273                 free_dma_iso_ctx(d);
1274         }
1275
1276         kfree(ctx);
1277         file->private_data = NULL;
1278
1279         unlock_kernel();
1280         return 0;
1281 }
1282
1283 #ifdef CONFIG_COMPAT
1284 static long video1394_compat_ioctl(struct file *f, unsigned cmd, unsigned long arg);
1285 #endif
1286
1287 static struct cdev video1394_cdev;
1288 static struct file_operations video1394_fops=
1289 {
1290         .owner =        THIS_MODULE,
1291         .unlocked_ioctl = video1394_ioctl,
1292 #ifdef CONFIG_COMPAT
1293         .compat_ioctl = video1394_compat_ioctl,
1294 #endif
1295         .poll =         video1394_poll,
1296         .mmap =         video1394_mmap,
1297         .open =         video1394_open,
1298         .release =      video1394_release
1299 };
1300
1301 /*** HOTPLUG STUFF **********************************************************/
1302 /*
1303  * Export information about protocols/devices supported by this driver.
1304  */
1305 static struct ieee1394_device_id video1394_id_table[] = {
1306         {
1307                 .match_flags    = IEEE1394_MATCH_SPECIFIER_ID | IEEE1394_MATCH_VERSION,
1308                 .specifier_id   = CAMERA_UNIT_SPEC_ID_ENTRY & 0xffffff,
1309                 .version        = CAMERA_SW_VERSION_ENTRY & 0xffffff
1310         },
1311         {
1312                 .match_flags    = IEEE1394_MATCH_SPECIFIER_ID | IEEE1394_MATCH_VERSION,
1313                 .specifier_id   = CAMERA_UNIT_SPEC_ID_ENTRY & 0xffffff,
1314                 .version        = (CAMERA_SW_VERSION_ENTRY + 1) & 0xffffff
1315         },
1316         {
1317                 .match_flags    = IEEE1394_MATCH_SPECIFIER_ID | IEEE1394_MATCH_VERSION,
1318                 .specifier_id   = CAMERA_UNIT_SPEC_ID_ENTRY & 0xffffff,
1319                 .version        = (CAMERA_SW_VERSION_ENTRY + 2) & 0xffffff
1320         },
1321         { }
1322 };
1323
1324 MODULE_DEVICE_TABLE(ieee1394, video1394_id_table);
1325
1326 static struct hpsb_protocol_driver video1394_driver = {
1327         .name           = "1394 Digital Camera Driver",
1328         .id_table       = video1394_id_table,
1329         .driver         = {
1330                 .name   = VIDEO1394_DRIVER_NAME,
1331                 .bus    = &ieee1394_bus_type,
1332         },
1333 };
1334
1335
1336 static void video1394_add_host (struct hpsb_host *host)
1337 {
1338         struct ti_ohci *ohci;
1339         int minor;
1340
1341         /* We only work with the OHCI-1394 driver */
1342         if (strcmp(host->driver->name, OHCI1394_DRIVER_NAME))
1343                 return;
1344
1345         ohci = (struct ti_ohci *)host->hostdata;
1346
1347         if (!hpsb_create_hostinfo(&video1394_highlevel, host, 0)) {
1348                 PRINT(KERN_ERR, ohci->host->id, "Cannot allocate hostinfo");
1349                 return;
1350         }
1351
1352         hpsb_set_hostinfo(&video1394_highlevel, host, ohci);
1353         hpsb_set_hostinfo_key(&video1394_highlevel, host, ohci->host->id);
1354
1355         minor = IEEE1394_MINOR_BLOCK_VIDEO1394 * 16 + ohci->host->id;
1356         class_device_create(hpsb_protocol_class, NULL, MKDEV(
1357                 IEEE1394_MAJOR, minor), 
1358                 NULL, "%s-%d", VIDEO1394_DRIVER_NAME, ohci->host->id);
1359 }
1360
1361
1362 static void video1394_remove_host (struct hpsb_host *host)
1363 {
1364         struct ti_ohci *ohci = hpsb_get_hostinfo(&video1394_highlevel, host);
1365
1366         if (ohci)
1367                 class_device_destroy(hpsb_protocol_class, MKDEV(IEEE1394_MAJOR,
1368                         IEEE1394_MINOR_BLOCK_VIDEO1394 * 16 + ohci->host->id));
1369         return;
1370 }
1371
1372
1373 static struct hpsb_highlevel video1394_highlevel = {
1374         .name =         VIDEO1394_DRIVER_NAME,
1375         .add_host =     video1394_add_host,
1376         .remove_host =  video1394_remove_host,
1377 };
1378
1379 MODULE_AUTHOR("Sebastien Rougeaux <sebastien.rougeaux@anu.edu.au>");
1380 MODULE_DESCRIPTION("driver for digital video on OHCI board");
1381 MODULE_SUPPORTED_DEVICE(VIDEO1394_DRIVER_NAME);
1382 MODULE_LICENSE("GPL");
1383
1384 #ifdef CONFIG_COMPAT
1385
1386 #define VIDEO1394_IOC32_LISTEN_QUEUE_BUFFER     \
1387         _IOW ('#', 0x12, struct video1394_wait32)
1388 #define VIDEO1394_IOC32_LISTEN_WAIT_BUFFER      \
1389         _IOWR('#', 0x13, struct video1394_wait32)
1390 #define VIDEO1394_IOC32_TALK_WAIT_BUFFER        \
1391         _IOW ('#', 0x17, struct video1394_wait32)
1392 #define VIDEO1394_IOC32_LISTEN_POLL_BUFFER      \
1393         _IOWR('#', 0x18, struct video1394_wait32)
1394
1395 struct video1394_wait32 {
1396         u32 channel;
1397         u32 buffer;
1398         struct compat_timeval filltime;
1399 };
1400
1401 static int video1394_wr_wait32(struct file *file, unsigned int cmd, unsigned long arg)
1402 {
1403         struct video1394_wait32 __user *argp = (void __user *)arg;
1404         struct video1394_wait32 wait32;
1405         struct video1394_wait wait;
1406         mm_segment_t old_fs;
1407         int ret;
1408
1409         if (copy_from_user(&wait32, argp, sizeof(wait32)))
1410                 return -EFAULT;
1411
1412         wait.channel = wait32.channel;
1413         wait.buffer = wait32.buffer;
1414         wait.filltime.tv_sec = (time_t)wait32.filltime.tv_sec;
1415         wait.filltime.tv_usec = (suseconds_t)wait32.filltime.tv_usec;
1416
1417         old_fs = get_fs();
1418         set_fs(KERNEL_DS);
1419         if (cmd == VIDEO1394_IOC32_LISTEN_WAIT_BUFFER)
1420                 ret = video1394_ioctl(file,
1421                                       VIDEO1394_IOC_LISTEN_WAIT_BUFFER,
1422                                       (unsigned long) &wait);
1423         else
1424                 ret = video1394_ioctl(file,
1425                                       VIDEO1394_IOC_LISTEN_POLL_BUFFER,
1426                                       (unsigned long) &wait);
1427         set_fs(old_fs);
1428
1429         if (!ret) {
1430                 wait32.channel = wait.channel;
1431                 wait32.buffer = wait.buffer;
1432                 wait32.filltime.tv_sec = (int)wait.filltime.tv_sec;
1433                 wait32.filltime.tv_usec = (int)wait.filltime.tv_usec;
1434
1435                 if (copy_to_user(argp, &wait32, sizeof(wait32)))
1436                         ret = -EFAULT;
1437         }
1438
1439         return ret;
1440 }
1441
1442 static int video1394_w_wait32(struct file *file, unsigned int cmd, unsigned long arg)
1443 {
1444         struct video1394_wait32 wait32;
1445         struct video1394_wait wait;
1446         mm_segment_t old_fs;
1447         int ret;
1448
1449         if (copy_from_user(&wait32, (void __user *)arg, sizeof(wait32)))
1450                 return -EFAULT;
1451
1452         wait.channel = wait32.channel;
1453         wait.buffer = wait32.buffer;
1454         wait.filltime.tv_sec = (time_t)wait32.filltime.tv_sec;
1455         wait.filltime.tv_usec = (suseconds_t)wait32.filltime.tv_usec;
1456
1457         old_fs = get_fs();
1458         set_fs(KERNEL_DS);
1459         if (cmd == VIDEO1394_IOC32_LISTEN_QUEUE_BUFFER)
1460                 ret = video1394_ioctl(file,
1461                                       VIDEO1394_IOC_LISTEN_QUEUE_BUFFER,
1462                                       (unsigned long) &wait);
1463         else
1464                 ret = video1394_ioctl(file,
1465                                       VIDEO1394_IOC_TALK_WAIT_BUFFER,
1466                                       (unsigned long) &wait);
1467         set_fs(old_fs);
1468
1469         return ret;
1470 }
1471
1472 static int video1394_queue_buf32(struct file *file, unsigned int cmd, unsigned long arg)
1473 {
1474         return -EFAULT;   /* ??? was there before. */
1475
1476         return video1394_ioctl(file,
1477                                 VIDEO1394_IOC_TALK_QUEUE_BUFFER, arg);
1478 }
1479
1480 static long video1394_compat_ioctl(struct file *f, unsigned cmd, unsigned long arg)
1481 {
1482         switch (cmd) {
1483         case VIDEO1394_IOC_LISTEN_CHANNEL:
1484         case VIDEO1394_IOC_UNLISTEN_CHANNEL:
1485         case VIDEO1394_IOC_TALK_CHANNEL:
1486         case VIDEO1394_IOC_UNTALK_CHANNEL:
1487                 return video1394_ioctl(f, cmd, arg);
1488
1489         case VIDEO1394_IOC32_LISTEN_QUEUE_BUFFER:
1490                 return video1394_w_wait32(f, cmd, arg);
1491         case VIDEO1394_IOC32_LISTEN_WAIT_BUFFER:
1492                 return video1394_wr_wait32(f, cmd, arg);
1493         case VIDEO1394_IOC_TALK_QUEUE_BUFFER:
1494                 return video1394_queue_buf32(f, cmd, arg);
1495         case VIDEO1394_IOC32_TALK_WAIT_BUFFER:
1496                 return video1394_w_wait32(f, cmd, arg);
1497         case VIDEO1394_IOC32_LISTEN_POLL_BUFFER:
1498                 return video1394_wr_wait32(f, cmd, arg);
1499         default:
1500                 return -ENOIOCTLCMD;
1501         }
1502 }
1503
1504 #endif /* CONFIG_COMPAT */
1505
1506 static void __exit video1394_exit_module (void)
1507 {
1508         hpsb_unregister_protocol(&video1394_driver);
1509         hpsb_unregister_highlevel(&video1394_highlevel);
1510         cdev_del(&video1394_cdev);
1511         PRINT_G(KERN_INFO, "Removed " VIDEO1394_DRIVER_NAME " module");
1512 }
1513
1514 static int __init video1394_init_module (void)
1515 {
1516         int ret;
1517
1518         cdev_init(&video1394_cdev, &video1394_fops);
1519         video1394_cdev.owner = THIS_MODULE;
1520         kobject_set_name(&video1394_cdev.kobj, VIDEO1394_DRIVER_NAME);
1521         ret = cdev_add(&video1394_cdev, IEEE1394_VIDEO1394_DEV, 16);
1522         if (ret) {
1523                 PRINT_G(KERN_ERR, "video1394: unable to get minor device block");
1524                 return ret;
1525         }
1526
1527         hpsb_register_highlevel(&video1394_highlevel);
1528
1529         ret = hpsb_register_protocol(&video1394_driver);
1530         if (ret) {
1531                 PRINT_G(KERN_ERR, "video1394: failed to register protocol");
1532                 hpsb_unregister_highlevel(&video1394_highlevel);
1533                 cdev_del(&video1394_cdev);
1534                 return ret;
1535         }
1536
1537         PRINT_G(KERN_INFO, "Installed " VIDEO1394_DRIVER_NAME " module");
1538         return 0;
1539 }
1540
1541
1542 module_init(video1394_init_module);
1543 module_exit(video1394_exit_module);