kmalloc/kzalloc changes:
[linux-2.6.git] / 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  * jds -- add private data to file to keep track of iso contexts associated
23  * with each open -- so release won't kill all iso transfers.
24  * 
25  * Damien Douxchamps: Fix failure when the number of DMA pages per frame is
26  * one.
27  * 
28  * ioctl return codes:
29  * EFAULT is only for invalid address for the argp
30  * EINVAL for out of range values
31  * EBUSY when trying to use an already used resource
32  * ESRCH when trying to free/stop a not used resource
33  * EAGAIN for resource allocation failure that could perhaps succeed later
34  * ENOTTY for unsupported ioctl request
35  *
36  */
37
38 /* Markus Tavenrath <speedygoo@speedygoo.de> :
39    - fixed checks for valid buffer-numbers in video1394_icotl
40    - changed the ways the dma prg's are used, now it's possible to use
41      even a single dma buffer
42 */
43 #include <linux/config.h>
44 #include <linux/kernel.h>
45 #include <linux/list.h>
46 #include <linux/slab.h>
47 #include <linux/interrupt.h>
48 #include <linux/wait.h>
49 #include <linux/errno.h>
50 #include <linux/module.h>
51 #include <linux/init.h>
52 #include <linux/pci.h>
53 #include <linux/fs.h>
54 #include <linux/poll.h>
55 #include <linux/smp_lock.h>
56 #include <linux/delay.h>
57 #include <linux/devfs_fs_kernel.h>
58 #include <linux/bitops.h>
59 #include <linux/types.h>
60 #include <linux/vmalloc.h>
61 #include <linux/timex.h>
62 #include <linux/mm.h>
63 #include <linux/ioctl32.h>
64 #include <linux/compat.h>
65 #include <linux/cdev.h>
66
67 #include "ieee1394.h"
68 #include "ieee1394_types.h"
69 #include "hosts.h"
70 #include "ieee1394_core.h"
71 #include "highlevel.h"
72 #include "video1394.h"
73 #include "nodemgr.h"
74 #include "dma.h"
75
76 #include "ohci1394.h"
77
78 #define ISO_CHANNELS 64
79
80 #ifndef virt_to_page
81 #define virt_to_page(x) MAP_NR(x)
82 #endif
83
84 #ifndef vmalloc_32
85 #define vmalloc_32(x) vmalloc(x)
86 #endif
87
88 struct it_dma_prg {
89         struct dma_cmd begin;
90         quadlet_t data[4];
91         struct dma_cmd end;
92         quadlet_t pad[4]; /* FIXME: quick hack for memory alignment */
93 };
94
95 struct dma_iso_ctx {
96         struct ti_ohci *ohci;
97         int type; /* OHCI_ISO_TRANSMIT or OHCI_ISO_RECEIVE */
98         struct ohci1394_iso_tasklet iso_tasklet;
99         int channel;
100         int ctx;
101         int last_buffer;
102         int * next_buffer;  /* For ISO Transmit of video packets
103                                to write the correct SYT field
104                                into the next block */
105         unsigned int num_desc;
106         unsigned int buf_size;
107         unsigned int frame_size;
108         unsigned int packet_size;
109         unsigned int left_size;
110         unsigned int nb_cmd;
111
112         struct dma_region dma;
113
114         struct dma_prog_region *prg_reg;
115
116         struct dma_cmd **ir_prg;
117         struct it_dma_prg **it_prg;
118
119         unsigned int *buffer_status;
120         unsigned int *buffer_prg_assignment;
121         struct timeval *buffer_time; /* time when the buffer was received */
122         unsigned int *last_used_cmd; /* For ISO Transmit with
123                                         variable sized packets only ! */
124         int ctrlClear;
125         int ctrlSet;
126         int cmdPtr;
127         int ctxMatch;
128         wait_queue_head_t waitq;
129         spinlock_t lock;
130         unsigned int syt_offset;
131         int flags;
132
133         struct list_head link;
134 };
135
136
137 struct file_ctx {
138         struct ti_ohci *ohci;
139         struct list_head context_list;
140         struct dma_iso_ctx *current_ctx;
141 };
142
143 #ifdef CONFIG_IEEE1394_VERBOSEDEBUG
144 #define VIDEO1394_DEBUG
145 #endif
146
147 #ifdef DBGMSG
148 #undef DBGMSG
149 #endif
150
151 #ifdef VIDEO1394_DEBUG
152 #define DBGMSG(card, fmt, args...) \
153 printk(KERN_INFO "video1394_%d: " fmt "\n" , card , ## args)
154 #else
155 #define DBGMSG(card, fmt, args...)
156 #endif
157
158 /* print general (card independent) information */
159 #define PRINT_G(level, fmt, args...) \
160 printk(level "video1394: " fmt "\n" , ## args)
161
162 /* print card specific information */
163 #define PRINT(level, card, fmt, args...) \
164 printk(level "video1394_%d: " fmt "\n" , card , ## args)
165
166 static void wakeup_dma_ir_ctx(unsigned long l);
167 static void wakeup_dma_it_ctx(unsigned long l);
168
169 static struct hpsb_highlevel video1394_highlevel;
170
171 static int free_dma_iso_ctx(struct dma_iso_ctx *d)
172 {
173         int i;
174
175         DBGMSG(d->ohci->host->id, "Freeing dma_iso_ctx %d", d->ctx);
176
177         ohci1394_stop_context(d->ohci, d->ctrlClear, NULL);
178         if (d->iso_tasklet.link.next != NULL)
179                 ohci1394_unregister_iso_tasklet(d->ohci, &d->iso_tasklet);
180
181         dma_region_free(&d->dma);
182
183         if (d->prg_reg) {
184                 for (i = 0; i < d->num_desc; i++)
185                         dma_prog_region_free(&d->prg_reg[i]);
186                 kfree(d->prg_reg);
187         }
188
189         kfree(d->ir_prg);
190         kfree(d->it_prg);
191         kfree(d->buffer_status);
192         kfree(d->buffer_prg_assignment);
193         kfree(d->buffer_time);
194         kfree(d->last_used_cmd);
195         kfree(d->next_buffer);
196         list_del(&d->link);
197         kfree(d);
198
199         return 0;
200 }
201
202 static struct dma_iso_ctx *
203 alloc_dma_iso_ctx(struct ti_ohci *ohci, int type, int num_desc,
204                   int buf_size, int channel, unsigned int packet_size)
205 {
206         struct dma_iso_ctx *d;
207         int i;
208
209         d = kzalloc(sizeof(*d), GFP_KERNEL);
210         if (!d) {
211                 PRINT(KERN_ERR, ohci->host->id, "Failed to allocate dma_iso_ctx");
212                 return NULL;
213         }
214
215         d->ohci = ohci;
216         d->type = type;
217         d->channel = channel;
218         d->num_desc = num_desc;
219         d->frame_size = buf_size;
220         d->buf_size = PAGE_ALIGN(buf_size);
221         d->last_buffer = -1;
222         INIT_LIST_HEAD(&d->link);
223         init_waitqueue_head(&d->waitq);
224
225         /* Init the regions for easy cleanup */
226         dma_region_init(&d->dma);
227
228         if (dma_region_alloc(&d->dma, (d->num_desc - 1) * d->buf_size, ohci->dev,
229                              PCI_DMA_BIDIRECTIONAL)) {
230                 PRINT(KERN_ERR, ohci->host->id, "Failed to allocate dma buffer");
231                 free_dma_iso_ctx(d);
232                 return NULL;
233         }
234
235         if (type == OHCI_ISO_RECEIVE)
236                 ohci1394_init_iso_tasklet(&d->iso_tasklet, type,
237                                           wakeup_dma_ir_ctx,
238                                           (unsigned long) d);
239         else
240                 ohci1394_init_iso_tasklet(&d->iso_tasklet, type,
241                                           wakeup_dma_it_ctx,
242                                           (unsigned long) d);
243
244         if (ohci1394_register_iso_tasklet(ohci, &d->iso_tasklet) < 0) {
245                 PRINT(KERN_ERR, ohci->host->id, "no free iso %s contexts",
246                       type == OHCI_ISO_RECEIVE ? "receive" : "transmit");
247                 free_dma_iso_ctx(d);
248                 return NULL;
249         }
250         d->ctx = d->iso_tasklet.context;
251
252         d->prg_reg = kmalloc(d->num_desc * sizeof(*d->prg_reg), GFP_KERNEL);
253         if (!d->prg_reg) {
254                 PRINT(KERN_ERR, ohci->host->id, "Failed to allocate ir prg regs");
255                 free_dma_iso_ctx(d);
256                 return NULL;
257         }
258         /* Makes for easier cleanup */
259         for (i = 0; i < d->num_desc; i++)
260                 dma_prog_region_init(&d->prg_reg[i]);
261
262         if (type == OHCI_ISO_RECEIVE) {
263                 d->ctrlSet = OHCI1394_IsoRcvContextControlSet+32*d->ctx;
264                 d->ctrlClear = OHCI1394_IsoRcvContextControlClear+32*d->ctx;
265                 d->cmdPtr = OHCI1394_IsoRcvCommandPtr+32*d->ctx;
266                 d->ctxMatch = OHCI1394_IsoRcvContextMatch+32*d->ctx;
267
268                 d->ir_prg = kzalloc(d->num_desc * sizeof(*d->ir_prg),
269                                     GFP_KERNEL);
270
271                 if (!d->ir_prg) {
272                         PRINT(KERN_ERR, ohci->host->id, "Failed to allocate dma ir prg");
273                         free_dma_iso_ctx(d);
274                         return NULL;
275                 }
276
277                 d->nb_cmd = d->buf_size / PAGE_SIZE + 1;
278                 d->left_size = (d->frame_size % PAGE_SIZE) ?
279                         d->frame_size % PAGE_SIZE : PAGE_SIZE;
280
281                 for (i = 0;i < d->num_desc; i++) {
282                         if (dma_prog_region_alloc(&d->prg_reg[i], d->nb_cmd *
283                                                   sizeof(struct dma_cmd), ohci->dev)) {
284                                 PRINT(KERN_ERR, ohci->host->id, "Failed to allocate dma ir prg");
285                                 free_dma_iso_ctx(d);
286                                 return NULL;
287                         }
288                         d->ir_prg[i] = (struct dma_cmd *)d->prg_reg[i].kvirt;
289                 }
290
291         } else {  /* OHCI_ISO_TRANSMIT */
292                 d->ctrlSet = OHCI1394_IsoXmitContextControlSet+16*d->ctx;
293                 d->ctrlClear = OHCI1394_IsoXmitContextControlClear+16*d->ctx;
294                 d->cmdPtr = OHCI1394_IsoXmitCommandPtr+16*d->ctx;
295
296                 d->it_prg = kzalloc(d->num_desc * sizeof(*d->it_prg),
297                                     GFP_KERNEL);
298
299                 if (!d->it_prg) {
300                         PRINT(KERN_ERR, ohci->host->id,
301                               "Failed to allocate dma it prg");
302                         free_dma_iso_ctx(d);
303                         return NULL;
304                 }
305
306                 d->packet_size = packet_size;
307
308                 if (PAGE_SIZE % packet_size || packet_size>4096) {
309                         PRINT(KERN_ERR, ohci->host->id,
310                               "Packet size %d (page_size: %ld) "
311                               "not yet supported\n",
312                               packet_size, PAGE_SIZE);
313                         free_dma_iso_ctx(d);
314                         return NULL;
315                 }
316
317                 d->nb_cmd = d->frame_size / d->packet_size;
318                 if (d->frame_size % d->packet_size) {
319                         d->nb_cmd++;
320                         d->left_size = d->frame_size % d->packet_size;
321                 } else
322                         d->left_size = d->packet_size;
323
324                 for (i = 0; i < d->num_desc; i++) {
325                         if (dma_prog_region_alloc(&d->prg_reg[i], d->nb_cmd *
326                                                 sizeof(struct it_dma_prg), ohci->dev)) {
327                                 PRINT(KERN_ERR, ohci->host->id, "Failed to allocate dma it prg");
328                                 free_dma_iso_ctx(d);
329                                 return NULL;
330                         }
331                         d->it_prg[i] = (struct it_dma_prg *)d->prg_reg[i].kvirt;
332                 }
333         }
334
335         d->buffer_status =
336             kzalloc(d->num_desc * sizeof(*d->buffer_status), GFP_KERNEL);
337         d->buffer_prg_assignment =
338             kzalloc(d->num_desc * sizeof(*d->buffer_prg_assignment), GFP_KERNEL);
339         d->buffer_time =
340             kzalloc(d->num_desc * sizeof(*d->buffer_time), GFP_KERNEL);
341         d->last_used_cmd =
342             kzalloc(d->num_desc * sizeof(*d->last_used_cmd), GFP_KERNEL);
343         d->next_buffer =
344             kzalloc(d->num_desc * sizeof(*d->next_buffer), GFP_KERNEL);
345
346         if (!d->buffer_status || !d->buffer_prg_assignment || !d->buffer_time ||
347             !d->last_used_cmd || !d->next_buffer) {
348                 PRINT(KERN_ERR, ohci->host->id,
349                       "Failed to allocate dma_iso_ctx member");
350                 free_dma_iso_ctx(d);
351                 return NULL;
352         }
353
354         spin_lock_init(&d->lock);
355
356         PRINT(KERN_INFO, ohci->host->id, "Iso %s DMA: %d buffers "
357               "of size %d allocated for a frame size %d, each with %d prgs",
358               (type == OHCI_ISO_RECEIVE) ? "receive" : "transmit",
359               d->num_desc - 1, d->buf_size, d->frame_size, d->nb_cmd);
360
361         return d;
362 }
363
364 static void reset_ir_status(struct dma_iso_ctx *d, int n)
365 {
366         int i;
367         d->ir_prg[n][0].status = cpu_to_le32(4);
368         d->ir_prg[n][1].status = cpu_to_le32(PAGE_SIZE-4);
369         for (i = 2; i < d->nb_cmd - 1; i++)
370                 d->ir_prg[n][i].status = cpu_to_le32(PAGE_SIZE);
371         d->ir_prg[n][i].status = cpu_to_le32(d->left_size);
372 }
373
374 static void reprogram_dma_ir_prg(struct dma_iso_ctx *d, int n, int buffer, int flags)
375 {
376         struct dma_cmd *ir_prg = d->ir_prg[n];
377         unsigned long buf = (unsigned long)d->dma.kvirt + buffer * d->buf_size;
378         int i;
379
380         d->buffer_prg_assignment[n] = buffer;
381
382         ir_prg[0].address = cpu_to_le32(dma_region_offset_to_bus(&d->dma, buf -
383                                 (unsigned long)d->dma.kvirt));
384         ir_prg[1].address = cpu_to_le32(dma_region_offset_to_bus(&d->dma,
385                                 (buf + 4) - (unsigned long)d->dma.kvirt));
386
387         for (i=2;i<d->nb_cmd-1;i++) {
388                 ir_prg[i].address = cpu_to_le32(dma_region_offset_to_bus(&d->dma,
389                                                 (buf+(i-1)*PAGE_SIZE) -
390                                                 (unsigned long)d->dma.kvirt));
391         }
392
393         ir_prg[i].control = cpu_to_le32(DMA_CTL_INPUT_MORE | DMA_CTL_UPDATE |
394                                   DMA_CTL_IRQ | DMA_CTL_BRANCH | d->left_size);
395         ir_prg[i].address = cpu_to_le32(dma_region_offset_to_bus(&d->dma,
396                                   (buf+(i-1)*PAGE_SIZE) - (unsigned long)d->dma.kvirt));
397 }
398
399 static void initialize_dma_ir_prg(struct dma_iso_ctx *d, int n, int flags)
400 {
401         struct dma_cmd *ir_prg = d->ir_prg[n];
402         struct dma_prog_region *ir_reg = &d->prg_reg[n];
403         unsigned long buf = (unsigned long)d->dma.kvirt;
404         int i;
405
406         /* the first descriptor will read only 4 bytes */
407         ir_prg[0].control = cpu_to_le32(DMA_CTL_INPUT_MORE | DMA_CTL_UPDATE |
408                 DMA_CTL_BRANCH | 4);
409
410         /* set the sync flag */
411         if (flags & VIDEO1394_SYNC_FRAMES)
412                 ir_prg[0].control |= cpu_to_le32(DMA_CTL_WAIT);
413
414         ir_prg[0].address = cpu_to_le32(dma_region_offset_to_bus(&d->dma, buf -
415                                 (unsigned long)d->dma.kvirt));
416         ir_prg[0].branchAddress = cpu_to_le32((dma_prog_region_offset_to_bus(ir_reg,
417                                         1 * sizeof(struct dma_cmd)) & 0xfffffff0) | 0x1);
418
419         /* If there is *not* only one DMA page per frame (hence, d->nb_cmd==2) */
420         if (d->nb_cmd > 2) {
421                 /* The second descriptor will read PAGE_SIZE-4 bytes */
422                 ir_prg[1].control = cpu_to_le32(DMA_CTL_INPUT_MORE | DMA_CTL_UPDATE |
423                                                 DMA_CTL_BRANCH | (PAGE_SIZE-4));
424                 ir_prg[1].address = cpu_to_le32(dma_region_offset_to_bus(&d->dma, (buf + 4) -
425                                                 (unsigned long)d->dma.kvirt));
426                 ir_prg[1].branchAddress = cpu_to_le32((dma_prog_region_offset_to_bus(ir_reg,
427                                                       2 * sizeof(struct dma_cmd)) & 0xfffffff0) | 0x1);
428
429                 for (i = 2; i < d->nb_cmd - 1; i++) {
430                         ir_prg[i].control = cpu_to_le32(DMA_CTL_INPUT_MORE | DMA_CTL_UPDATE |
431                                                         DMA_CTL_BRANCH | PAGE_SIZE);
432                         ir_prg[i].address = cpu_to_le32(dma_region_offset_to_bus(&d->dma,
433                                                         (buf+(i-1)*PAGE_SIZE) -
434                                                         (unsigned long)d->dma.kvirt));
435
436                         ir_prg[i].branchAddress =
437                                 cpu_to_le32((dma_prog_region_offset_to_bus(ir_reg,
438                                             (i + 1) * sizeof(struct dma_cmd)) & 0xfffffff0) | 0x1);
439                 }
440
441                 /* The last descriptor will generate an interrupt */
442                 ir_prg[i].control = cpu_to_le32(DMA_CTL_INPUT_MORE | DMA_CTL_UPDATE |
443                                                 DMA_CTL_IRQ | DMA_CTL_BRANCH | d->left_size);
444                 ir_prg[i].address = cpu_to_le32(dma_region_offset_to_bus(&d->dma,
445                                                 (buf+(i-1)*PAGE_SIZE) -
446                                                 (unsigned long)d->dma.kvirt));
447         } else {
448                 /* Only one DMA page is used. Read d->left_size immediately and */
449                 /* generate an interrupt as this is also the last page. */
450                 ir_prg[1].control = cpu_to_le32(DMA_CTL_INPUT_MORE | DMA_CTL_UPDATE |
451                                                 DMA_CTL_IRQ | DMA_CTL_BRANCH | (d->left_size-4));
452                 ir_prg[1].address = cpu_to_le32(dma_region_offset_to_bus(&d->dma,
453                                                 (buf + 4) - (unsigned long)d->dma.kvirt));
454         }
455 }
456
457 static void initialize_dma_ir_ctx(struct dma_iso_ctx *d, int tag, int flags)
458 {
459         struct ti_ohci *ohci = (struct ti_ohci *)d->ohci;
460         int i;
461
462         d->flags = flags;
463
464         ohci1394_stop_context(ohci, d->ctrlClear, NULL);
465
466         for (i=0;i<d->num_desc;i++) {
467                 initialize_dma_ir_prg(d, i, flags);
468                 reset_ir_status(d, i);
469         }
470
471         /* reset the ctrl register */
472         reg_write(ohci, d->ctrlClear, 0xf0000000);
473
474         /* Set bufferFill */
475         reg_write(ohci, d->ctrlSet, 0x80000000);
476
477         /* Set isoch header */
478         if (flags & VIDEO1394_INCLUDE_ISO_HEADERS)
479                 reg_write(ohci, d->ctrlSet, 0x40000000);
480
481         /* Set the context match register to match on all tags,
482            sync for sync tag, and listen to d->channel */
483         reg_write(ohci, d->ctxMatch, 0xf0000000|((tag&0xf)<<8)|d->channel);
484
485         /* Set up isoRecvIntMask to generate interrupts */
486         reg_write(ohci, OHCI1394_IsoRecvIntMaskSet, 1<<d->ctx);
487 }
488
489 /* find which context is listening to this channel */
490 static struct dma_iso_ctx *
491 find_ctx(struct list_head *list, int type, int channel)
492 {
493         struct dma_iso_ctx *ctx;
494
495         list_for_each_entry(ctx, list, link) {
496                 if (ctx->type == type && ctx->channel == channel)
497                         return ctx;
498         }
499
500         return NULL;
501 }
502
503 static void wakeup_dma_ir_ctx(unsigned long l)
504 {
505         struct dma_iso_ctx *d = (struct dma_iso_ctx *) l;
506         int i;
507
508         spin_lock(&d->lock);
509
510         for (i = 0; i < d->num_desc; i++) {
511                 if (d->ir_prg[i][d->nb_cmd-1].status & cpu_to_le32(0xFFFF0000)) {
512                         reset_ir_status(d, i);
513                         d->buffer_status[d->buffer_prg_assignment[i]] = VIDEO1394_BUFFER_READY;
514                         do_gettimeofday(&d->buffer_time[i]);
515                 }
516         }
517
518         spin_unlock(&d->lock);
519
520         if (waitqueue_active(&d->waitq))
521                 wake_up_interruptible(&d->waitq);
522 }
523
524 static inline void put_timestamp(struct ti_ohci *ohci, struct dma_iso_ctx * d,
525                                  int n)
526 {
527         unsigned char* buf = d->dma.kvirt + n * d->buf_size;
528         u32 cycleTimer;
529         u32 timeStamp;
530
531         if (n == -1) {
532           return;
533         }
534
535         cycleTimer = reg_read(ohci, OHCI1394_IsochronousCycleTimer);
536
537         timeStamp = ((cycleTimer & 0x0fff) + d->syt_offset); /* 11059 = 450 us */
538         timeStamp = (timeStamp % 3072 + ((timeStamp / 3072) << 12)
539                 + (cycleTimer & 0xf000)) & 0xffff;
540
541         buf[6] = timeStamp >> 8;
542         buf[7] = timeStamp & 0xff;
543
544     /* if first packet is empty packet, then put timestamp into the next full one too */
545     if ( (le32_to_cpu(d->it_prg[n][0].data[1]) >>16) == 0x008) {
546             buf += d->packet_size;
547         buf[6] = timeStamp >> 8;
548             buf[7] = timeStamp & 0xff;
549         }
550
551     /* do the next buffer frame too in case of irq latency */
552         n = d->next_buffer[n];
553         if (n == -1) {
554           return;
555         }
556         buf = d->dma.kvirt + n * d->buf_size;
557
558         timeStamp += (d->last_used_cmd[n] << 12) & 0xffff;
559
560         buf[6] = timeStamp >> 8;
561         buf[7] = timeStamp & 0xff;
562
563     /* if first packet is empty packet, then put timestamp into the next full one too */
564     if ( (le32_to_cpu(d->it_prg[n][0].data[1]) >>16) == 0x008) {
565             buf += d->packet_size;
566         buf[6] = timeStamp >> 8;
567             buf[7] = timeStamp & 0xff;
568         }
569
570 #if 0
571         printk("curr: %d, next: %d, cycleTimer: %08x timeStamp: %08x\n",
572                curr, n, cycleTimer, timeStamp);
573 #endif
574 }
575
576 static void wakeup_dma_it_ctx(unsigned long l)
577 {
578         struct dma_iso_ctx *d = (struct dma_iso_ctx *) l;
579         struct ti_ohci *ohci = d->ohci;
580         int i;
581
582         spin_lock(&d->lock);
583
584         for (i = 0; i < d->num_desc; i++) {
585                 if (d->it_prg[i][d->last_used_cmd[i]].end.status &
586                     cpu_to_le32(0xFFFF0000)) {
587                         int next = d->next_buffer[i];
588                         put_timestamp(ohci, d, next);
589                         d->it_prg[i][d->last_used_cmd[i]].end.status = 0;
590                         d->buffer_status[d->buffer_prg_assignment[i]] = VIDEO1394_BUFFER_READY;
591                 }
592         }
593
594         spin_unlock(&d->lock);
595
596         if (waitqueue_active(&d->waitq))
597                 wake_up_interruptible(&d->waitq);
598 }
599
600 static void reprogram_dma_it_prg(struct dma_iso_ctx  *d, int n, int buffer)
601 {
602         struct it_dma_prg *it_prg = d->it_prg[n];
603         unsigned long buf = (unsigned long)d->dma.kvirt + buffer * d->buf_size;
604         int i;
605
606         d->buffer_prg_assignment[n] = buffer;
607         for (i=0;i<d->nb_cmd;i++) {
608           it_prg[i].end.address =
609                 cpu_to_le32(dma_region_offset_to_bus(&d->dma,
610                         (buf+i*d->packet_size) - (unsigned long)d->dma.kvirt));
611         }
612 }
613
614 static void initialize_dma_it_prg(struct dma_iso_ctx *d, int n, int sync_tag)
615 {
616         struct it_dma_prg *it_prg = d->it_prg[n];
617         struct dma_prog_region *it_reg = &d->prg_reg[n];
618         unsigned long buf = (unsigned long)d->dma.kvirt;
619         int i;
620         d->last_used_cmd[n] = d->nb_cmd - 1;
621         for (i=0;i<d->nb_cmd;i++) {
622
623                 it_prg[i].begin.control = cpu_to_le32(DMA_CTL_OUTPUT_MORE |
624                         DMA_CTL_IMMEDIATE | 8) ;
625                 it_prg[i].begin.address = 0;
626
627                 it_prg[i].begin.status = 0;
628
629                 it_prg[i].data[0] = cpu_to_le32(
630                         (IEEE1394_SPEED_100 << 16)
631                         | (/* tag */ 1 << 14)
632                         | (d->channel << 8)
633                         | (TCODE_ISO_DATA << 4));
634                 if (i==0) it_prg[i].data[0] |= cpu_to_le32(sync_tag);
635                 it_prg[i].data[1] = cpu_to_le32(d->packet_size << 16);
636                 it_prg[i].data[2] = 0;
637                 it_prg[i].data[3] = 0;
638
639                 it_prg[i].end.control = cpu_to_le32(DMA_CTL_OUTPUT_LAST |
640                                              DMA_CTL_BRANCH);
641                 it_prg[i].end.address =
642                         cpu_to_le32(dma_region_offset_to_bus(&d->dma, (buf+i*d->packet_size) -
643                                                 (unsigned long)d->dma.kvirt));
644
645                 if (i<d->nb_cmd-1) {
646                         it_prg[i].end.control |= cpu_to_le32(d->packet_size);
647                         it_prg[i].begin.branchAddress =
648                                 cpu_to_le32((dma_prog_region_offset_to_bus(it_reg, (i + 1) *
649                                         sizeof(struct it_dma_prg)) & 0xfffffff0) | 0x3);
650                         it_prg[i].end.branchAddress =
651                                 cpu_to_le32((dma_prog_region_offset_to_bus(it_reg, (i + 1) *
652                                         sizeof(struct it_dma_prg)) & 0xfffffff0) | 0x3);
653                 } else {
654                         /* the last prg generates an interrupt */
655                         it_prg[i].end.control |= cpu_to_le32(DMA_CTL_UPDATE |
656                                 DMA_CTL_IRQ | d->left_size);
657                         /* the last prg doesn't branch */
658                         it_prg[i].begin.branchAddress = 0;
659                         it_prg[i].end.branchAddress = 0;
660                 }
661                 it_prg[i].end.status = 0;
662         }
663 }
664
665 static void initialize_dma_it_prg_var_packet_queue(
666         struct dma_iso_ctx *d, int n, unsigned int * packet_sizes,
667         struct ti_ohci *ohci)
668 {
669         struct it_dma_prg *it_prg = d->it_prg[n];
670         struct dma_prog_region *it_reg = &d->prg_reg[n];
671         int i;
672
673 #if 0
674         if (n != -1) {
675                 put_timestamp(ohci, d, n);
676         }
677 #endif
678         d->last_used_cmd[n] = d->nb_cmd - 1;
679
680         for (i = 0; i < d->nb_cmd; i++) {
681                 unsigned int size;
682                 if (packet_sizes[i] > d->packet_size) {
683                         size = d->packet_size;
684                 } else {
685                         size = packet_sizes[i];
686                 }
687                 it_prg[i].data[1] = cpu_to_le32(size << 16);
688                 it_prg[i].end.control = cpu_to_le32(DMA_CTL_OUTPUT_LAST | DMA_CTL_BRANCH);
689
690                 if (i < d->nb_cmd-1 && packet_sizes[i+1] != 0) {
691                         it_prg[i].end.control |= cpu_to_le32(size);
692                         it_prg[i].begin.branchAddress =
693                                 cpu_to_le32((dma_prog_region_offset_to_bus(it_reg, (i + 1) *
694                                         sizeof(struct it_dma_prg)) & 0xfffffff0) | 0x3);
695                         it_prg[i].end.branchAddress =
696                                 cpu_to_le32((dma_prog_region_offset_to_bus(it_reg, (i + 1) *
697                                         sizeof(struct it_dma_prg)) & 0xfffffff0) | 0x3);
698                 } else {
699                         /* the last prg generates an interrupt */
700                         it_prg[i].end.control |= cpu_to_le32(DMA_CTL_UPDATE |
701                                 DMA_CTL_IRQ | size);
702                         /* the last prg doesn't branch */
703                         it_prg[i].begin.branchAddress = 0;
704                         it_prg[i].end.branchAddress = 0;
705                         d->last_used_cmd[n] = i;
706                         break;
707                 }
708         }
709 }
710
711 static void initialize_dma_it_ctx(struct dma_iso_ctx *d, int sync_tag,
712                                   unsigned int syt_offset, int flags)
713 {
714         struct ti_ohci *ohci = (struct ti_ohci *)d->ohci;
715         int i;
716
717         d->flags = flags;
718         d->syt_offset = (syt_offset == 0 ? 11000 : syt_offset);
719
720         ohci1394_stop_context(ohci, d->ctrlClear, NULL);
721
722         for (i=0;i<d->num_desc;i++)
723                 initialize_dma_it_prg(d, i, sync_tag);
724
725         /* Set up isoRecvIntMask to generate interrupts */
726         reg_write(ohci, OHCI1394_IsoXmitIntMaskSet, 1<<d->ctx);
727 }
728
729 static inline unsigned video1394_buffer_state(struct dma_iso_ctx *d,
730                                               unsigned int buffer)
731 {
732         unsigned long flags;
733         unsigned int ret;
734         spin_lock_irqsave(&d->lock, flags);
735         ret = d->buffer_status[buffer];
736         spin_unlock_irqrestore(&d->lock, flags);
737         return ret;
738 }
739
740 static int __video1394_ioctl(struct file *file,
741                              unsigned int cmd, unsigned long arg)
742 {
743         struct file_ctx *ctx = (struct file_ctx *)file->private_data;
744         struct ti_ohci *ohci = ctx->ohci;
745         unsigned long flags;
746         void __user *argp = (void __user *)arg;
747
748         switch(cmd)
749         {
750         case VIDEO1394_IOC_LISTEN_CHANNEL:
751         case VIDEO1394_IOC_TALK_CHANNEL:
752         {
753                 struct video1394_mmap v;
754                 u64 mask;
755                 struct dma_iso_ctx *d;
756                 int i;
757
758                 if (copy_from_user(&v, argp, sizeof(v)))
759                         return -EFAULT;
760
761                 /* if channel < 0, find lowest available one */
762                 if (v.channel < 0) {
763                     mask = (u64)0x1;
764                     for (i=0; ; i++) {
765                         if (i == ISO_CHANNELS) {
766                             PRINT(KERN_ERR, ohci->host->id, 
767                                   "No free channel found");
768                             return EAGAIN;
769                         }
770                         if (!(ohci->ISO_channel_usage & mask)) {
771                             v.channel = i;
772                             PRINT(KERN_INFO, ohci->host->id, "Found free channel %d", i);
773                             break;
774                         }
775                         mask = mask << 1;
776                     }
777                 } else if (v.channel >= ISO_CHANNELS) {
778                         PRINT(KERN_ERR, ohci->host->id,
779                               "Iso channel %d out of bounds", v.channel);
780                         return -EINVAL;
781                 } else {
782                         mask = (u64)0x1<<v.channel;
783                 }
784                 PRINT(KERN_INFO, ohci->host->id, "mask: %08X%08X usage: %08X%08X\n",
785                         (u32)(mask>>32),(u32)(mask&0xffffffff),
786                         (u32)(ohci->ISO_channel_usage>>32),
787                         (u32)(ohci->ISO_channel_usage&0xffffffff));
788                 if (ohci->ISO_channel_usage & mask) {
789                         PRINT(KERN_ERR, ohci->host->id,
790                               "Channel %d is already taken", v.channel);
791                         return -EBUSY;
792                 }
793
794                 if (v.buf_size == 0 || v.buf_size > VIDEO1394_MAX_SIZE) {
795                         PRINT(KERN_ERR, ohci->host->id,
796                               "Invalid %d length buffer requested",v.buf_size);
797                         return -EINVAL;
798                 }
799
800                 if (v.nb_buffers == 0 || v.nb_buffers > VIDEO1394_MAX_SIZE) {
801                         PRINT(KERN_ERR, ohci->host->id,
802                               "Invalid %d buffers requested",v.nb_buffers);
803                         return -EINVAL;
804                 }
805
806                 if (v.nb_buffers * v.buf_size > VIDEO1394_MAX_SIZE) {
807                         PRINT(KERN_ERR, ohci->host->id,
808                               "%d buffers of size %d bytes is too big",
809                               v.nb_buffers, v.buf_size);
810                         return -EINVAL;
811                 }
812
813                 if (cmd == VIDEO1394_IOC_LISTEN_CHANNEL) {
814                         d = alloc_dma_iso_ctx(ohci, OHCI_ISO_RECEIVE,
815                                               v.nb_buffers + 1, v.buf_size,
816                                               v.channel, 0);
817
818                         if (d == NULL) {
819                                 PRINT(KERN_ERR, ohci->host->id,
820                                       "Couldn't allocate ir context");
821                                 return -EAGAIN;
822                         }
823                         initialize_dma_ir_ctx(d, v.sync_tag, v.flags);
824
825                         ctx->current_ctx = d;
826
827                         v.buf_size = d->buf_size;
828                         list_add_tail(&d->link, &ctx->context_list);
829
830                         PRINT(KERN_INFO, ohci->host->id,
831                               "iso context %d listen on channel %d",
832                               d->ctx, v.channel);
833                 }
834                 else {
835                         d = alloc_dma_iso_ctx(ohci, OHCI_ISO_TRANSMIT,
836                                               v.nb_buffers + 1, v.buf_size,
837                                               v.channel, v.packet_size);
838
839                         if (d == NULL) {
840                                 PRINT(KERN_ERR, ohci->host->id,
841                                       "Couldn't allocate it context");
842                                 return -EAGAIN;
843                         }
844                         initialize_dma_it_ctx(d, v.sync_tag,
845                                               v.syt_offset, v.flags);
846
847                         ctx->current_ctx = d;
848
849                         v.buf_size = d->buf_size;
850
851                         list_add_tail(&d->link, &ctx->context_list);
852
853                         PRINT(KERN_INFO, ohci->host->id,
854                               "Iso context %d talk on channel %d", d->ctx,
855                               v.channel);
856                 }
857
858                 if (copy_to_user(argp, &v, sizeof(v))) {
859                         /* FIXME : free allocated dma resources */
860                         return -EFAULT;
861                 }
862                 
863                 ohci->ISO_channel_usage |= mask;
864
865                 return 0;
866         }
867         case VIDEO1394_IOC_UNLISTEN_CHANNEL:
868         case VIDEO1394_IOC_UNTALK_CHANNEL:
869         {
870                 int channel;
871                 u64 mask;
872                 struct dma_iso_ctx *d;
873
874                 if (copy_from_user(&channel, argp, sizeof(int)))
875                         return -EFAULT;
876
877                 if (channel < 0 || channel >= ISO_CHANNELS) {
878                         PRINT(KERN_ERR, ohci->host->id,
879                               "Iso channel %d out of bound", channel);
880                         return -EINVAL;
881                 }
882                 mask = (u64)0x1<<channel;
883                 if (!(ohci->ISO_channel_usage & mask)) {
884                         PRINT(KERN_ERR, ohci->host->id,
885                               "Channel %d is not being used", channel);
886                         return -ESRCH;
887                 }
888
889                 /* Mark this channel as unused */
890                 ohci->ISO_channel_usage &= ~mask;
891
892                 if (cmd == VIDEO1394_IOC_UNLISTEN_CHANNEL)
893                         d = find_ctx(&ctx->context_list, OHCI_ISO_RECEIVE, channel);
894                 else
895                         d = find_ctx(&ctx->context_list, OHCI_ISO_TRANSMIT, channel);
896
897                 if (d == NULL) return -ESRCH;
898                 PRINT(KERN_INFO, ohci->host->id, "Iso context %d "
899                       "stop talking on channel %d", d->ctx, channel);
900                 free_dma_iso_ctx(d);
901
902                 return 0;
903         }
904         case VIDEO1394_IOC_LISTEN_QUEUE_BUFFER:
905         {
906                 struct video1394_wait v;
907                 struct dma_iso_ctx *d;
908                 int next_prg;
909
910                 if (copy_from_user(&v, argp, sizeof(v)))
911                         return -EFAULT;
912
913                 d = find_ctx(&ctx->context_list, OHCI_ISO_RECEIVE, v.channel);
914                 if (d == NULL) return -EFAULT;
915
916                 if ((v.buffer<0) || (v.buffer>=d->num_desc - 1)) {
917                         PRINT(KERN_ERR, ohci->host->id,
918                               "Buffer %d out of range",v.buffer);
919                         return -EINVAL;
920                 }
921
922                 spin_lock_irqsave(&d->lock,flags);
923
924                 if (d->buffer_status[v.buffer]==VIDEO1394_BUFFER_QUEUED) {
925                         PRINT(KERN_ERR, ohci->host->id,
926                               "Buffer %d is already used",v.buffer);
927                         spin_unlock_irqrestore(&d->lock,flags);
928                         return -EBUSY;
929                 }
930
931                 d->buffer_status[v.buffer]=VIDEO1394_BUFFER_QUEUED;
932
933                 next_prg = (d->last_buffer + 1) % d->num_desc;
934                 if (d->last_buffer>=0)
935                         d->ir_prg[d->last_buffer][d->nb_cmd-1].branchAddress =
936                                 cpu_to_le32((dma_prog_region_offset_to_bus(&d->prg_reg[next_prg], 0)
937                                         & 0xfffffff0) | 0x1);
938
939                 d->last_buffer = next_prg;
940                 reprogram_dma_ir_prg(d, d->last_buffer, v.buffer, d->flags);
941
942                 d->ir_prg[d->last_buffer][d->nb_cmd-1].branchAddress = 0;
943
944                 spin_unlock_irqrestore(&d->lock,flags);
945
946                 if (!(reg_read(ohci, d->ctrlSet) & 0x8000))
947                 {
948                         DBGMSG(ohci->host->id, "Starting iso DMA ctx=%d",d->ctx);
949
950                         /* Tell the controller where the first program is */
951                         reg_write(ohci, d->cmdPtr,
952                                   dma_prog_region_offset_to_bus(&d->prg_reg[d->last_buffer], 0) | 0x1);
953
954                         /* Run IR context */
955                         reg_write(ohci, d->ctrlSet, 0x8000);
956                 }
957                 else {
958                         /* Wake up dma context if necessary */
959                         if (!(reg_read(ohci, d->ctrlSet) & 0x400)) {
960                                 PRINT(KERN_INFO, ohci->host->id,
961                                       "Waking up iso dma ctx=%d", d->ctx);
962                                 reg_write(ohci, d->ctrlSet, 0x1000);
963                         }
964                 }
965                 return 0;
966
967         }
968         case VIDEO1394_IOC_LISTEN_WAIT_BUFFER:
969         case VIDEO1394_IOC_LISTEN_POLL_BUFFER:
970         {
971                 struct video1394_wait v;
972                 struct dma_iso_ctx *d;
973                 int i = 0;
974
975                 if (copy_from_user(&v, argp, sizeof(v)))
976                         return -EFAULT;
977
978                 d = find_ctx(&ctx->context_list, OHCI_ISO_RECEIVE, v.channel);
979                 if (d == NULL) return -EFAULT;
980
981                 if ((v.buffer<0) || (v.buffer>d->num_desc - 1)) {
982                         PRINT(KERN_ERR, ohci->host->id,
983                               "Buffer %d out of range",v.buffer);
984                         return -EINVAL;
985                 }
986
987                 /*
988                  * I change the way it works so that it returns
989                  * the last received frame.
990                  */
991                 spin_lock_irqsave(&d->lock, flags);
992                 switch(d->buffer_status[v.buffer]) {
993                 case VIDEO1394_BUFFER_READY:
994                         d->buffer_status[v.buffer]=VIDEO1394_BUFFER_FREE;
995                         break;
996                 case VIDEO1394_BUFFER_QUEUED:
997                         if (cmd == VIDEO1394_IOC_LISTEN_POLL_BUFFER) {
998                             /* for polling, return error code EINTR */
999                             spin_unlock_irqrestore(&d->lock, flags);
1000                             return -EINTR;
1001                         }
1002
1003                         spin_unlock_irqrestore(&d->lock, flags);
1004                         wait_event_interruptible(d->waitq,
1005                                         video1394_buffer_state(d, v.buffer) ==
1006                                          VIDEO1394_BUFFER_READY);
1007                         if (signal_pending(current))
1008                                 return -EINTR;
1009                         spin_lock_irqsave(&d->lock, flags);
1010                         d->buffer_status[v.buffer]=VIDEO1394_BUFFER_FREE;
1011                         break;
1012                 default:
1013                         PRINT(KERN_ERR, ohci->host->id,
1014                               "Buffer %d is not queued",v.buffer);
1015                         spin_unlock_irqrestore(&d->lock, flags);
1016                         return -ESRCH;
1017                 }
1018
1019                 /* set time of buffer */
1020                 v.filltime = d->buffer_time[v.buffer];
1021 //              printk("Buffer %d time %d\n", v.buffer, (d->buffer_time[v.buffer]).tv_usec);
1022
1023                 /*
1024                  * Look ahead to see how many more buffers have been received
1025                  */
1026                 i=0;
1027                 while (d->buffer_status[(v.buffer+1)%(d->num_desc - 1)]==
1028                        VIDEO1394_BUFFER_READY) {
1029                         v.buffer=(v.buffer+1)%(d->num_desc - 1);
1030                         i++;
1031                 }
1032                 spin_unlock_irqrestore(&d->lock, flags);
1033
1034                 v.buffer=i;
1035                 if (copy_to_user(argp, &v, sizeof(v)))
1036                         return -EFAULT;
1037
1038                 return 0;
1039         }
1040         case VIDEO1394_IOC_TALK_QUEUE_BUFFER:
1041         {
1042                 struct video1394_wait v;
1043                 unsigned int *psizes = NULL;
1044                 struct dma_iso_ctx *d;
1045                 int next_prg;
1046
1047                 if (copy_from_user(&v, argp, sizeof(v)))
1048                         return -EFAULT;
1049
1050                 d = find_ctx(&ctx->context_list, OHCI_ISO_TRANSMIT, v.channel);
1051                 if (d == NULL) return -EFAULT;
1052
1053                 if ((v.buffer<0) || (v.buffer>=d->num_desc - 1)) {
1054                         PRINT(KERN_ERR, ohci->host->id,
1055                               "Buffer %d out of range",v.buffer);
1056                         return -EINVAL;
1057                 }
1058
1059                 if (d->flags & VIDEO1394_VARIABLE_PACKET_SIZE) {
1060                         int buf_size = d->nb_cmd * sizeof(*psizes);
1061                         struct video1394_queue_variable __user *p = argp;
1062                         unsigned int __user *qv;
1063
1064                         if (get_user(qv, &p->packet_sizes))
1065                                 return -EFAULT;
1066
1067                         psizes = kmalloc(buf_size, GFP_KERNEL);
1068                         if (!psizes)
1069                                 return -ENOMEM;
1070
1071                         if (copy_from_user(psizes, qv, buf_size)) {
1072                                 kfree(psizes);
1073                                 return -EFAULT;
1074                         }
1075                 }
1076
1077                 spin_lock_irqsave(&d->lock,flags);
1078
1079                 // last_buffer is last_prg
1080                 next_prg = (d->last_buffer + 1) % d->num_desc;
1081                 if (d->buffer_status[v.buffer]!=VIDEO1394_BUFFER_FREE) {
1082                         PRINT(KERN_ERR, ohci->host->id,
1083                               "Buffer %d is already used",v.buffer);
1084                         spin_unlock_irqrestore(&d->lock,flags);
1085                         kfree(psizes);
1086                         return -EBUSY;
1087                 }
1088
1089                 if (d->flags & VIDEO1394_VARIABLE_PACKET_SIZE) {
1090                         initialize_dma_it_prg_var_packet_queue(
1091                                 d, next_prg, psizes, ohci);
1092                 }
1093
1094                 d->buffer_status[v.buffer]=VIDEO1394_BUFFER_QUEUED;
1095
1096                 if (d->last_buffer >= 0) {
1097                         d->it_prg[d->last_buffer]
1098                                 [ d->last_used_cmd[d->last_buffer] ].end.branchAddress =
1099                                         cpu_to_le32((dma_prog_region_offset_to_bus(&d->prg_reg[next_prg],
1100                                                 0) & 0xfffffff0) | 0x3);
1101
1102                         d->it_prg[d->last_buffer]
1103                                 [ d->last_used_cmd[d->last_buffer] ].begin.branchAddress =
1104                                         cpu_to_le32((dma_prog_region_offset_to_bus(&d->prg_reg[next_prg],
1105                                                 0) & 0xfffffff0) | 0x3);
1106                         d->next_buffer[d->last_buffer] = (v.buffer + 1) % (d->num_desc - 1);
1107                 }
1108                 d->last_buffer = next_prg;
1109                 reprogram_dma_it_prg(d, d->last_buffer, v.buffer);
1110                 d->next_buffer[d->last_buffer] = -1;
1111
1112                 d->it_prg[d->last_buffer][d->last_used_cmd[d->last_buffer]].end.branchAddress = 0;
1113
1114                 spin_unlock_irqrestore(&d->lock,flags);
1115
1116                 if (!(reg_read(ohci, d->ctrlSet) & 0x8000))
1117                 {
1118                         DBGMSG(ohci->host->id, "Starting iso transmit DMA ctx=%d",
1119                                d->ctx);
1120                         put_timestamp(ohci, d, d->last_buffer);
1121
1122                         /* Tell the controller where the first program is */
1123                         reg_write(ohci, d->cmdPtr,
1124                                 dma_prog_region_offset_to_bus(&d->prg_reg[next_prg], 0) | 0x3);
1125
1126                         /* Run IT context */
1127                         reg_write(ohci, d->ctrlSet, 0x8000);
1128                 }
1129                 else {
1130                         /* Wake up dma context if necessary */
1131                         if (!(reg_read(ohci, d->ctrlSet) & 0x400)) {
1132                                 PRINT(KERN_INFO, ohci->host->id,
1133                                       "Waking up iso transmit dma ctx=%d",
1134                                       d->ctx);
1135                                 put_timestamp(ohci, d, d->last_buffer);
1136                                 reg_write(ohci, d->ctrlSet, 0x1000);
1137                         }
1138                 }
1139
1140                 kfree(psizes);
1141                 return 0;
1142
1143         }
1144         case VIDEO1394_IOC_TALK_WAIT_BUFFER:
1145         {
1146                 struct video1394_wait v;
1147                 struct dma_iso_ctx *d;
1148
1149                 if (copy_from_user(&v, argp, sizeof(v)))
1150                         return -EFAULT;
1151
1152                 d = find_ctx(&ctx->context_list, OHCI_ISO_TRANSMIT, v.channel);
1153                 if (d == NULL) return -EFAULT;
1154
1155                 if ((v.buffer<0) || (v.buffer>=d->num_desc-1)) {
1156                         PRINT(KERN_ERR, ohci->host->id,
1157                               "Buffer %d out of range",v.buffer);
1158                         return -EINVAL;
1159                 }
1160
1161                 switch(d->buffer_status[v.buffer]) {
1162                 case VIDEO1394_BUFFER_READY:
1163                         d->buffer_status[v.buffer]=VIDEO1394_BUFFER_FREE;
1164                         return 0;
1165                 case VIDEO1394_BUFFER_QUEUED:
1166                         wait_event_interruptible(d->waitq,
1167                                         (d->buffer_status[v.buffer] == VIDEO1394_BUFFER_READY));
1168                         if (signal_pending(current))
1169                                 return -EINTR;
1170                         d->buffer_status[v.buffer]=VIDEO1394_BUFFER_FREE;
1171                         return 0;
1172                 default:
1173                         PRINT(KERN_ERR, ohci->host->id,
1174                               "Buffer %d is not queued",v.buffer);
1175                         return -ESRCH;
1176                 }
1177         }
1178         default:
1179                 return -ENOTTY;
1180         }
1181 }
1182
1183 static long video1394_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1184 {
1185         int err;
1186         lock_kernel();
1187         err = __video1394_ioctl(file, cmd, arg);
1188         unlock_kernel();
1189         return err;
1190 }
1191
1192 /*
1193  *      This maps the vmalloced and reserved buffer to user space.
1194  *
1195  *  FIXME:
1196  *  - PAGE_READONLY should suffice!?
1197  *  - remap_pfn_range is kind of inefficient for page by page remapping.
1198  *    But e.g. pte_alloc() does not work in modules ... :-(
1199  */
1200
1201 static int video1394_mmap(struct file *file, struct vm_area_struct *vma)
1202 {
1203         struct file_ctx *ctx = (struct file_ctx *)file->private_data;
1204         int res = -EINVAL;
1205
1206         lock_kernel();
1207         if (ctx->current_ctx == NULL) {
1208                 PRINT(KERN_ERR, ctx->ohci->host->id, "Current iso context not set");
1209         } else
1210                 res = dma_region_mmap(&ctx->current_ctx->dma, file, vma);
1211         unlock_kernel();
1212
1213         return res;
1214 }
1215
1216 static int video1394_open(struct inode *inode, struct file *file)
1217 {
1218         int i = ieee1394_file_to_instance(file);
1219         struct ti_ohci *ohci;
1220         struct file_ctx *ctx;
1221
1222         ohci = hpsb_get_hostinfo_bykey(&video1394_highlevel, i);
1223         if (ohci == NULL)
1224                 return -EIO;
1225
1226         ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
1227         if (!ctx)  {
1228                 PRINT(KERN_ERR, ohci->host->id, "Cannot malloc file_ctx");
1229                 return -ENOMEM;
1230         }
1231
1232         ctx->ohci = ohci;
1233         INIT_LIST_HEAD(&ctx->context_list);
1234         ctx->current_ctx = NULL;
1235         file->private_data = ctx;
1236
1237         return 0;
1238 }
1239
1240 static int video1394_release(struct inode *inode, struct file *file)
1241 {
1242         struct file_ctx *ctx = (struct file_ctx *)file->private_data;
1243         struct ti_ohci *ohci = ctx->ohci;
1244         struct list_head *lh, *next;
1245         u64 mask;
1246
1247         lock_kernel();
1248         list_for_each_safe(lh, next, &ctx->context_list) {
1249                 struct dma_iso_ctx *d;
1250                 d = list_entry(lh, struct dma_iso_ctx, link);
1251                 mask = (u64) 1 << d->channel;
1252
1253                 if (!(ohci->ISO_channel_usage & mask))
1254                         PRINT(KERN_ERR, ohci->host->id, "On release: Channel %d "
1255                               "is not being used", d->channel);
1256                 else
1257                         ohci->ISO_channel_usage &= ~mask;
1258                 PRINT(KERN_INFO, ohci->host->id, "On release: Iso %s context "
1259                       "%d stop listening on channel %d",
1260                       d->type == OHCI_ISO_RECEIVE ? "receive" : "transmit",
1261                       d->ctx, d->channel);
1262                 free_dma_iso_ctx(d);
1263         }
1264
1265         kfree(ctx);
1266         file->private_data = NULL;
1267
1268         unlock_kernel();
1269         return 0;
1270 }
1271
1272 #ifdef CONFIG_COMPAT
1273 static long video1394_compat_ioctl(struct file *f, unsigned cmd, unsigned long arg);
1274 #endif
1275
1276 static struct cdev video1394_cdev;
1277 static struct file_operations video1394_fops=
1278 {
1279         .owner =        THIS_MODULE,
1280         .unlocked_ioctl = video1394_ioctl,
1281 #ifdef CONFIG_COMPAT
1282         .compat_ioctl = video1394_compat_ioctl,
1283 #endif
1284         .mmap =         video1394_mmap,
1285         .open =         video1394_open,
1286         .release =      video1394_release
1287 };
1288
1289 /*** HOTPLUG STUFF **********************************************************/
1290 /*
1291  * Export information about protocols/devices supported by this driver.
1292  */
1293 static struct ieee1394_device_id video1394_id_table[] = {
1294         {
1295                 .match_flags    = IEEE1394_MATCH_SPECIFIER_ID | IEEE1394_MATCH_VERSION,
1296                 .specifier_id   = CAMERA_UNIT_SPEC_ID_ENTRY & 0xffffff,
1297                 .version        = CAMERA_SW_VERSION_ENTRY & 0xffffff
1298         },
1299         {
1300                 .match_flags    = IEEE1394_MATCH_SPECIFIER_ID | IEEE1394_MATCH_VERSION,
1301                 .specifier_id   = CAMERA_UNIT_SPEC_ID_ENTRY & 0xffffff,
1302                 .version        = (CAMERA_SW_VERSION_ENTRY + 1) & 0xffffff
1303         },
1304         {
1305                 .match_flags    = IEEE1394_MATCH_SPECIFIER_ID | IEEE1394_MATCH_VERSION,
1306                 .specifier_id   = CAMERA_UNIT_SPEC_ID_ENTRY & 0xffffff,
1307                 .version        = (CAMERA_SW_VERSION_ENTRY + 2) & 0xffffff
1308         },
1309         { }
1310 };
1311
1312 MODULE_DEVICE_TABLE(ieee1394, video1394_id_table);
1313
1314 static struct hpsb_protocol_driver video1394_driver = {
1315         .name           = "1394 Digital Camera Driver",
1316         .id_table       = video1394_id_table,
1317         .driver         = {
1318                 .name   = VIDEO1394_DRIVER_NAME,
1319                 .bus    = &ieee1394_bus_type,
1320         },
1321 };
1322
1323
1324 static void video1394_add_host (struct hpsb_host *host)
1325 {
1326         struct ti_ohci *ohci;
1327         int minor;
1328
1329         /* We only work with the OHCI-1394 driver */
1330         if (strcmp(host->driver->name, OHCI1394_DRIVER_NAME))
1331                 return;
1332
1333         ohci = (struct ti_ohci *)host->hostdata;
1334
1335         if (!hpsb_create_hostinfo(&video1394_highlevel, host, 0)) {
1336                 PRINT(KERN_ERR, ohci->host->id, "Cannot allocate hostinfo");
1337                 return;
1338         }
1339
1340         hpsb_set_hostinfo(&video1394_highlevel, host, ohci);
1341         hpsb_set_hostinfo_key(&video1394_highlevel, host, ohci->host->id);
1342
1343         minor = IEEE1394_MINOR_BLOCK_VIDEO1394 * 16 + ohci->host->id;
1344         class_device_create(hpsb_protocol_class, NULL, MKDEV(
1345                 IEEE1394_MAJOR, minor), 
1346                 NULL, "%s-%d", VIDEO1394_DRIVER_NAME, ohci->host->id);
1347         devfs_mk_cdev(MKDEV(IEEE1394_MAJOR, minor),
1348                        S_IFCHR | S_IRUSR | S_IWUSR,
1349                        "%s/%d", VIDEO1394_DRIVER_NAME, ohci->host->id);
1350 }
1351
1352
1353 static void video1394_remove_host (struct hpsb_host *host)
1354 {
1355         struct ti_ohci *ohci = hpsb_get_hostinfo(&video1394_highlevel, host);
1356
1357         if (ohci) {
1358                 class_device_destroy(hpsb_protocol_class, MKDEV(IEEE1394_MAJOR,
1359                         IEEE1394_MINOR_BLOCK_VIDEO1394 * 16 + ohci->host->id));
1360                 devfs_remove("%s/%d", VIDEO1394_DRIVER_NAME, ohci->host->id);
1361         }
1362         
1363         return;
1364 }
1365
1366
1367 static struct hpsb_highlevel video1394_highlevel = {
1368         .name =         VIDEO1394_DRIVER_NAME,
1369         .add_host =     video1394_add_host,
1370         .remove_host =  video1394_remove_host,
1371 };
1372
1373 MODULE_AUTHOR("Sebastien Rougeaux <sebastien.rougeaux@anu.edu.au>");
1374 MODULE_DESCRIPTION("driver for digital video on OHCI board");
1375 MODULE_SUPPORTED_DEVICE(VIDEO1394_DRIVER_NAME);
1376 MODULE_LICENSE("GPL");
1377
1378 #ifdef CONFIG_COMPAT
1379
1380 #define VIDEO1394_IOC32_LISTEN_QUEUE_BUFFER     \
1381         _IOW ('#', 0x12, struct video1394_wait32)
1382 #define VIDEO1394_IOC32_LISTEN_WAIT_BUFFER      \
1383         _IOWR('#', 0x13, struct video1394_wait32)
1384 #define VIDEO1394_IOC32_TALK_WAIT_BUFFER        \
1385         _IOW ('#', 0x17, struct video1394_wait32)
1386 #define VIDEO1394_IOC32_LISTEN_POLL_BUFFER      \
1387         _IOWR('#', 0x18, struct video1394_wait32)
1388
1389 struct video1394_wait32 {
1390         u32 channel;
1391         u32 buffer;
1392         struct compat_timeval filltime;
1393 };
1394
1395 static int video1394_wr_wait32(struct file *file, unsigned int cmd, unsigned long arg)
1396 {
1397         struct video1394_wait32 __user *argp = (void __user *)arg;
1398         struct video1394_wait32 wait32;
1399         struct video1394_wait wait;
1400         mm_segment_t old_fs;
1401         int ret;
1402
1403         if (copy_from_user(&wait32, argp, sizeof(wait32)))
1404                 return -EFAULT;
1405
1406         wait.channel = wait32.channel;
1407         wait.buffer = wait32.buffer;
1408         wait.filltime.tv_sec = (time_t)wait32.filltime.tv_sec;
1409         wait.filltime.tv_usec = (suseconds_t)wait32.filltime.tv_usec;
1410
1411         old_fs = get_fs();
1412         set_fs(KERNEL_DS);
1413         if (cmd == VIDEO1394_IOC32_LISTEN_WAIT_BUFFER)
1414                 ret = video1394_ioctl(file,
1415                                       VIDEO1394_IOC_LISTEN_WAIT_BUFFER,
1416                                       (unsigned long) &wait);
1417         else
1418                 ret = video1394_ioctl(file,
1419                                       VIDEO1394_IOC_LISTEN_POLL_BUFFER,
1420                                       (unsigned long) &wait);
1421         set_fs(old_fs);
1422
1423         if (!ret) {
1424                 wait32.channel = wait.channel;
1425                 wait32.buffer = wait.buffer;
1426                 wait32.filltime.tv_sec = (int)wait.filltime.tv_sec;
1427                 wait32.filltime.tv_usec = (int)wait.filltime.tv_usec;
1428
1429                 if (copy_to_user(argp, &wait32, sizeof(wait32)))
1430                         ret = -EFAULT;
1431         }
1432
1433         return ret;
1434 }
1435
1436 static int video1394_w_wait32(struct file *file, unsigned int cmd, unsigned long arg)
1437 {
1438         struct video1394_wait32 wait32;
1439         struct video1394_wait wait;
1440         mm_segment_t old_fs;
1441         int ret;
1442
1443         if (copy_from_user(&wait32, (void __user *)arg, sizeof(wait32)))
1444                 return -EFAULT;
1445
1446         wait.channel = wait32.channel;
1447         wait.buffer = wait32.buffer;
1448         wait.filltime.tv_sec = (time_t)wait32.filltime.tv_sec;
1449         wait.filltime.tv_usec = (suseconds_t)wait32.filltime.tv_usec;
1450
1451         old_fs = get_fs();
1452         set_fs(KERNEL_DS);
1453         if (cmd == VIDEO1394_IOC32_LISTEN_QUEUE_BUFFER)
1454                 ret = video1394_ioctl(file,
1455                                       VIDEO1394_IOC_LISTEN_QUEUE_BUFFER,
1456                                       (unsigned long) &wait);
1457         else
1458                 ret = video1394_ioctl(file,
1459                                       VIDEO1394_IOC_TALK_WAIT_BUFFER,
1460                                       (unsigned long) &wait);
1461         set_fs(old_fs);
1462
1463         return ret;
1464 }
1465
1466 static int video1394_queue_buf32(struct file *file, unsigned int cmd, unsigned long arg)
1467 {
1468         return -EFAULT;   /* ??? was there before. */
1469
1470         return video1394_ioctl(file,
1471                                 VIDEO1394_IOC_TALK_QUEUE_BUFFER, arg);
1472 }
1473
1474 static long video1394_compat_ioctl(struct file *f, unsigned cmd, unsigned long arg)
1475 {
1476         switch (cmd) {
1477         case VIDEO1394_IOC_LISTEN_CHANNEL:
1478         case VIDEO1394_IOC_UNLISTEN_CHANNEL:
1479         case VIDEO1394_IOC_TALK_CHANNEL:
1480         case VIDEO1394_IOC_UNTALK_CHANNEL:
1481                 return video1394_ioctl(f, cmd, arg);
1482
1483         case VIDEO1394_IOC32_LISTEN_QUEUE_BUFFER:
1484                 return video1394_w_wait32(f, cmd, arg);
1485         case VIDEO1394_IOC32_LISTEN_WAIT_BUFFER:
1486                 return video1394_wr_wait32(f, cmd, arg);
1487         case VIDEO1394_IOC_TALK_QUEUE_BUFFER:
1488                 return video1394_queue_buf32(f, cmd, arg);
1489         case VIDEO1394_IOC32_TALK_WAIT_BUFFER:
1490                 return video1394_w_wait32(f, cmd, arg);
1491         case VIDEO1394_IOC32_LISTEN_POLL_BUFFER:
1492                 return video1394_wr_wait32(f, cmd, arg);
1493         default:
1494                 return -ENOIOCTLCMD;
1495         }
1496 }
1497
1498 #endif /* CONFIG_COMPAT */
1499
1500 static void __exit video1394_exit_module (void)
1501 {
1502         hpsb_unregister_protocol(&video1394_driver);
1503
1504         hpsb_unregister_highlevel(&video1394_highlevel);
1505
1506         devfs_remove(VIDEO1394_DRIVER_NAME);
1507         cdev_del(&video1394_cdev);
1508
1509         PRINT_G(KERN_INFO, "Removed " VIDEO1394_DRIVER_NAME " module");
1510 }
1511
1512 static int __init video1394_init_module (void)
1513 {
1514         int ret;
1515
1516         cdev_init(&video1394_cdev, &video1394_fops);
1517         video1394_cdev.owner = THIS_MODULE;
1518         kobject_set_name(&video1394_cdev.kobj, VIDEO1394_DRIVER_NAME);
1519         ret = cdev_add(&video1394_cdev, IEEE1394_VIDEO1394_DEV, 16);
1520         if (ret) {
1521                 PRINT_G(KERN_ERR, "video1394: unable to get minor device block");
1522                 return ret;
1523         }
1524
1525         devfs_mk_dir(VIDEO1394_DRIVER_NAME);
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                 devfs_remove(VIDEO1394_DRIVER_NAME);
1534                 cdev_del(&video1394_cdev);
1535                 return ret;
1536         }
1537
1538         PRINT_G(KERN_INFO, "Installed " VIDEO1394_DRIVER_NAME " module");
1539         return 0;
1540 }
1541
1542
1543 module_init(video1394_init_module);
1544 module_exit(video1394_exit_module);