V4L/DVB (6251): Replace video-buf to a more generic approach
[linux-2.6] / drivers / media / video / videobuf-dma-sg.c
1 /*
2  * helper functions for PCI DMA video4linux capture buffers
3  *
4  * The functions expect the hardware being able to scatter gatter
5  * (i.e. the buffers are not linear in physical memory, but fragmented
6  * into PAGE_SIZE chunks).  They also assume the driver does not need
7  * to touch the video data.
8  *
9  * (c) 2007 Mauro Carvalho Chehab, <mchehab@infradead.org>
10  *
11  * Highly based on video-buf written originally by:
12  * (c) 2001,02 Gerd Knorr <kraxel@bytesex.org>
13  * (c) 2006 Mauro Carvalho Chehab, <mchehab@infradead.org>
14  * (c) 2006 Ted Walther and John Sokol
15  *
16  * This program is free software; you can redistribute it and/or modify
17  * it under the terms of the GNU General Public License as published by
18  * the Free Software Foundation; either version 2
19  */
20
21 #include <linux/init.h>
22 #include <linux/module.h>
23 #include <linux/moduleparam.h>
24 #include <linux/slab.h>
25 #include <linux/interrupt.h>
26
27 #include <linux/pci.h>
28 #include <linux/vmalloc.h>
29 #include <linux/pagemap.h>
30 #include <asm/page.h>
31 #include <asm/pgtable.h>
32
33 #include <media/videobuf-dma-sg.h>
34
35 #define MAGIC_DMABUF 0x19721112
36 #define MAGIC_SG_MEM 0x17890714
37
38 #define MAGIC_CHECK(is,should)  if (unlikely((is) != (should))) \
39         { printk(KERN_ERR "magic mismatch: %x (expected %x)\n",is,should); BUG(); }
40
41 static int debug = 0;
42 module_param(debug, int, 0644);
43
44 MODULE_DESCRIPTION("helper module to manage video4linux pci dma sg buffers");
45 MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
46 MODULE_LICENSE("GPL");
47
48 #define dprintk(level, fmt, arg...)     if (debug >= level) \
49         printk(KERN_DEBUG "vbuf-sg: " fmt , ## arg)
50
51 /* --------------------------------------------------------------------- */
52
53 struct scatterlist*
54 videobuf_vmalloc_to_sg(unsigned char *virt, int nr_pages)
55 {
56         struct scatterlist *sglist;
57         struct page *pg;
58         int i;
59
60         sglist = kcalloc(nr_pages, sizeof(struct scatterlist), GFP_KERNEL);
61         if (NULL == sglist)
62                 return NULL;
63         for (i = 0; i < nr_pages; i++, virt += PAGE_SIZE) {
64                 pg = vmalloc_to_page(virt);
65                 if (NULL == pg)
66                         goto err;
67                 BUG_ON(PageHighMem(pg));
68                 sglist[i].page   = pg;
69                 sglist[i].length = PAGE_SIZE;
70         }
71         return sglist;
72
73  err:
74         kfree(sglist);
75         return NULL;
76 }
77
78 struct scatterlist*
79 videobuf_pages_to_sg(struct page **pages, int nr_pages, int offset)
80 {
81         struct scatterlist *sglist;
82         int i = 0;
83
84         if (NULL == pages[0])
85                 return NULL;
86         sglist = kcalloc(nr_pages, sizeof(*sglist), GFP_KERNEL);
87         if (NULL == sglist)
88                 return NULL;
89
90         if (NULL == pages[0])
91                 goto nopage;
92         if (PageHighMem(pages[0]))
93                 /* DMA to highmem pages might not work */
94                 goto highmem;
95         sglist[0].page   = pages[0];
96         sglist[0].offset = offset;
97         sglist[0].length = PAGE_SIZE - offset;
98         for (i = 1; i < nr_pages; i++) {
99                 if (NULL == pages[i])
100                         goto nopage;
101                 if (PageHighMem(pages[i]))
102                         goto highmem;
103                 sglist[i].page   = pages[i];
104                 sglist[i].length = PAGE_SIZE;
105         }
106         return sglist;
107
108  nopage:
109         dprintk(2,"sgl: oops - no page\n");
110         kfree(sglist);
111         return NULL;
112
113  highmem:
114         dprintk(2,"sgl: oops - highmem page\n");
115         kfree(sglist);
116         return NULL;
117 }
118
119 /* --------------------------------------------------------------------- */
120
121 struct videobuf_dmabuf *videobuf_to_dma (struct videobuf_buffer *buf)
122 {
123         struct videbuf_pci_sg_memory *mem=buf->priv;
124         BUG_ON (!mem);
125
126         MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
127
128         return &mem->dma;
129 }
130
131 void videobuf_dma_init(struct videobuf_dmabuf *dma)
132 {
133         memset(dma,0,sizeof(*dma));
134         dma->magic = MAGIC_DMABUF;
135 }
136
137 int videobuf_dma_init_user(struct videobuf_dmabuf *dma, int direction,
138                            unsigned long data, unsigned long size)
139 {
140         unsigned long first,last;
141         int err, rw = 0;
142
143         dma->direction = direction;
144         switch (dma->direction) {
145         case PCI_DMA_FROMDEVICE: rw = READ;  break;
146         case PCI_DMA_TODEVICE:   rw = WRITE; break;
147         default:                 BUG();
148         }
149
150         first = (data          & PAGE_MASK) >> PAGE_SHIFT;
151         last  = ((data+size-1) & PAGE_MASK) >> PAGE_SHIFT;
152         dma->offset   = data & ~PAGE_MASK;
153         dma->nr_pages = last-first+1;
154         dma->pages = kmalloc(dma->nr_pages * sizeof(struct page*),
155                              GFP_KERNEL);
156         if (NULL == dma->pages)
157                 return -ENOMEM;
158         dprintk(1,"init user [0x%lx+0x%lx => %d pages]\n",
159                 data,size,dma->nr_pages);
160
161         dma->varea = (void *) data;
162
163         down_read(&current->mm->mmap_sem);
164         err = get_user_pages(current,current->mm,
165                              data & PAGE_MASK, dma->nr_pages,
166                              rw == READ, 1, /* force */
167                              dma->pages, NULL);
168         up_read(&current->mm->mmap_sem);
169         if (err != dma->nr_pages) {
170                 dma->nr_pages = (err >= 0) ? err : 0;
171                 dprintk(1,"get_user_pages: err=%d [%d]\n",err,dma->nr_pages);
172                 return err < 0 ? err : -EINVAL;
173         }
174         return 0;
175 }
176
177 int videobuf_dma_init_kernel(struct videobuf_dmabuf *dma, int direction,
178                              int nr_pages)
179 {
180         dprintk(1,"init kernel [%d pages]\n",nr_pages);
181         dma->direction = direction;
182         dma->vmalloc = vmalloc_32(nr_pages << PAGE_SHIFT);
183         if (NULL == dma->vmalloc) {
184                 dprintk(1,"vmalloc_32(%d pages) failed\n",nr_pages);
185                 return -ENOMEM;
186         }
187         dprintk(1,"vmalloc is at addr 0x%08lx, size=%d\n",
188                                 (unsigned long)dma->vmalloc,
189                                 nr_pages << PAGE_SHIFT);
190         memset(dma->vmalloc,0,nr_pages << PAGE_SHIFT);
191         dma->nr_pages = nr_pages;
192         return 0;
193 }
194
195 int videobuf_dma_init_overlay(struct videobuf_dmabuf *dma, int direction,
196                               dma_addr_t addr, int nr_pages)
197 {
198         dprintk(1,"init overlay [%d pages @ bus 0x%lx]\n",
199                 nr_pages,(unsigned long)addr);
200         dma->direction = direction;
201         if (0 == addr)
202                 return -EINVAL;
203
204         dma->bus_addr = addr;
205         dma->nr_pages = nr_pages;
206         return 0;
207 }
208
209 int videobuf_dma_map(struct videobuf_queue* q,struct videobuf_dmabuf *dma)
210 {
211         void                   *dev=q->dev;
212         struct videobuf_dma_sg_ops *ops=q->priv_ops;
213
214         MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
215         BUG_ON(0 == dma->nr_pages);
216
217         if (dma->pages) {
218                 dma->sglist = videobuf_pages_to_sg(dma->pages, dma->nr_pages,
219                                                    dma->offset);
220         }
221         if (dma->vmalloc) {
222                 dma->sglist = videobuf_vmalloc_to_sg
223                                                 (dma->vmalloc,dma->nr_pages);
224         }
225         if (dma->bus_addr) {
226                 dma->sglist = kmalloc(sizeof(struct scatterlist), GFP_KERNEL);
227                 if (NULL != dma->sglist) {
228                         dma->sglen  = 1;
229                         sg_dma_address(&dma->sglist[0]) = dma->bus_addr & PAGE_MASK;
230                         dma->sglist[0].offset           = dma->bus_addr & ~PAGE_MASK;
231                         sg_dma_len(&dma->sglist[0])     = dma->nr_pages * PAGE_SIZE;
232                 }
233         }
234         if (NULL == dma->sglist) {
235                 dprintk(1,"scatterlist is NULL\n");
236                 return -ENOMEM;
237         }
238         if (!dma->bus_addr) {
239                 if (ops && ops->vb_map_sg) {
240                         dma->sglen = ops->vb_map_sg(dev,dma->sglist,
241                                         dma->nr_pages, dma->direction);
242                 }
243                 if (0 == dma->sglen) {
244                         printk(KERN_WARNING
245                                "%s: videobuf_map_sg failed\n",__FUNCTION__);
246                         kfree(dma->sglist);
247                         dma->sglist = NULL;
248                         dma->sglen = 0;
249                         return -EIO;
250                 }
251         }
252         return 0;
253 }
254
255 int videobuf_dma_sync(struct videobuf_queue *q,struct videobuf_dmabuf *dma)
256 {
257         void                   *dev=q->dev;
258         struct videobuf_dma_sg_ops *ops=q->priv_ops;
259
260         MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
261         BUG_ON(!dma->sglen);
262
263         if (!dma->bus_addr && ops && ops->vb_dma_sync_sg)
264                 ops->vb_dma_sync_sg(dev,dma->sglist,dma->nr_pages,
265                                                         dma->direction);
266
267         return 0;
268 }
269
270 int videobuf_dma_unmap(struct videobuf_queue* q,struct videobuf_dmabuf *dma)
271 {
272         void                   *dev=q->dev;
273         struct videobuf_dma_sg_ops *ops=q->priv_ops;
274
275         MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
276         if (!dma->sglen)
277                 return 0;
278
279         if (!dma->bus_addr && ops && ops->vb_unmap_sg)
280                         ops->vb_unmap_sg(dev,dma->sglist,dma->nr_pages,
281                                                         dma->direction);
282         kfree(dma->sglist);
283         dma->sglist = NULL;
284         dma->sglen = 0;
285         return 0;
286 }
287
288 int videobuf_dma_free(struct videobuf_dmabuf *dma)
289 {
290         MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
291         BUG_ON(dma->sglen);
292
293         if (dma->pages) {
294                 int i;
295                 for (i=0; i < dma->nr_pages; i++)
296                         page_cache_release(dma->pages[i]);
297                 kfree(dma->pages);
298                 dma->pages = NULL;
299         }
300
301         vfree(dma->vmalloc);
302         dma->vmalloc = NULL;
303         dma->varea = NULL;
304
305         if (dma->bus_addr) {
306                 dma->bus_addr = 0;
307         }
308         dma->direction = PCI_DMA_NONE;
309         return 0;
310 }
311
312 /* --------------------------------------------------------------------- */
313
314 int videobuf_pci_dma_map(struct pci_dev *pci,struct videobuf_dmabuf *dma)
315 {
316         struct videobuf_queue q;
317         struct videobuf_dma_sg_ops qops;
318
319         q.dev=pci;
320         qops.vb_map_sg=(vb_map_sg_t *)pci_map_sg;
321         qops.vb_unmap_sg=(vb_map_sg_t *)pci_unmap_sg;
322         q.priv_ops = &qops;
323
324         return (videobuf_dma_map(&q,dma));
325 }
326
327 int videobuf_pci_dma_unmap(struct pci_dev *pci,struct videobuf_dmabuf *dma)
328 {
329         struct videobuf_queue q;
330         struct videobuf_dma_sg_ops qops;
331
332         q.dev=pci;
333         qops.vb_map_sg=(vb_map_sg_t *)pci_map_sg;
334         qops.vb_unmap_sg=(vb_map_sg_t *)pci_unmap_sg;
335         q.priv_ops = &qops;
336
337         return (videobuf_dma_unmap(&q,dma));
338 }
339
340 /* --------------------------------------------------------------------- */
341
342 static void
343 videobuf_vm_open(struct vm_area_struct *vma)
344 {
345         struct videobuf_mapping *map = vma->vm_private_data;
346
347         dprintk(2,"vm_open %p [count=%d,vma=%08lx-%08lx]\n",map,
348                 map->count,vma->vm_start,vma->vm_end);
349         map->count++;
350 }
351
352 static void
353 videobuf_vm_close(struct vm_area_struct *vma)
354 {
355         struct videobuf_mapping *map = vma->vm_private_data;
356         struct videobuf_queue *q = map->q;
357         struct videbuf_pci_sg_memory *mem;
358         int i;
359
360         dprintk(2,"vm_close %p [count=%d,vma=%08lx-%08lx]\n",map,
361                 map->count,vma->vm_start,vma->vm_end);
362
363         map->count--;
364         if (0 == map->count) {
365                 dprintk(1,"munmap %p q=%p\n",map,q);
366                 mutex_lock(&q->lock);
367                 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
368                         if (NULL == q->bufs[i])
369                                 continue;
370                         mem=q->bufs[i]->priv;
371
372                         if (!mem)
373                                 continue;
374
375                         MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
376
377                         if (mem->map != map)
378                                 continue;
379                         mem->map   = NULL;
380                         q->bufs[i]->baddr = 0;
381                         q->ops->buf_release(q,q->bufs[i]);
382                 }
383                 mutex_unlock(&q->lock);
384                 kfree(map);
385         }
386         return;
387 }
388
389 /*
390  * Get a anonymous page for the mapping.  Make sure we can DMA to that
391  * memory location with 32bit PCI devices (i.e. don't use highmem for
392  * now ...).  Bounce buffers don't work very well for the data rates
393  * video capture has.
394  */
395 static struct page*
396 videobuf_vm_nopage(struct vm_area_struct *vma, unsigned long vaddr,
397                    int *type)
398 {
399         struct page *page;
400
401         dprintk(3,"nopage: fault @ %08lx [vma %08lx-%08lx]\n",
402                 vaddr,vma->vm_start,vma->vm_end);
403         if (vaddr > vma->vm_end)
404                 return NOPAGE_SIGBUS;
405         page = alloc_page(GFP_USER | __GFP_DMA32);
406         if (!page)
407                 return NOPAGE_OOM;
408         clear_user_page(page_address(page), vaddr, page);
409         if (type)
410                 *type = VM_FAULT_MINOR;
411         return page;
412 }
413
414 static struct vm_operations_struct videobuf_vm_ops =
415 {
416         .open     = videobuf_vm_open,
417         .close    = videobuf_vm_close,
418         .nopage   = videobuf_vm_nopage,
419 };
420
421 /* ---------------------------------------------------------------------
422  * PCI handlers for the generic methods
423  */
424
425 /* Allocated area consists on 3 parts:
426         struct video_buffer
427         struct <driver>_buffer (cx88_buffer, saa7134_buf, ...)
428         struct videobuf_pci_sg_memory
429  */
430
431 static void *__videobuf_alloc(size_t size)
432 {
433         struct videbuf_pci_sg_memory *mem;
434         struct videobuf_buffer *vb;
435
436         vb = kzalloc(size+sizeof(*mem),GFP_KERNEL);
437
438         mem = vb->priv = ((char *)vb)+size;
439         mem->magic=MAGIC_SG_MEM;
440
441         videobuf_dma_init(&mem->dma);
442
443         dprintk(1,"%s: allocated at %p(%ld+%ld) & %p(%ld)\n",
444                 __FUNCTION__,vb,(long)sizeof(*vb),(long)size-sizeof(*vb),
445                 mem,(long)sizeof(*mem));
446
447         return vb;
448 }
449
450 static int __videobuf_iolock (struct videobuf_queue* q,
451                               struct videobuf_buffer *vb,
452                               struct v4l2_framebuffer *fbuf)
453 {
454         int err,pages;
455         dma_addr_t bus;
456         struct videbuf_pci_sg_memory *mem=vb->priv;
457         BUG_ON(!mem);
458
459         MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
460
461         switch (vb->memory) {
462         case V4L2_MEMORY_MMAP:
463         case V4L2_MEMORY_USERPTR:
464                 if (0 == vb->baddr) {
465                         /* no userspace addr -- kernel bounce buffer */
466                         pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT;
467                         err = videobuf_dma_init_kernel( &mem->dma,
468                                                         PCI_DMA_FROMDEVICE,
469                                                         pages );
470                         if (0 != err)
471                                 return err;
472                 } else {
473                         /* dma directly to userspace */
474                         err = videobuf_dma_init_user( &mem->dma,
475                                                       PCI_DMA_FROMDEVICE,
476                                                       vb->baddr,vb->bsize );
477                         if (0 != err)
478                                 return err;
479                 }
480                 break;
481         case V4L2_MEMORY_OVERLAY:
482                 if (NULL == fbuf)
483                         return -EINVAL;
484                 /* FIXME: need sanity checks for vb->boff */
485                 /*
486                  * Using a double cast to avoid compiler warnings when
487                  * building for PAE. Compiler doesn't like direct casting
488                  * of a 32 bit ptr to 64 bit integer.
489                  */
490                 bus   = (dma_addr_t)(unsigned long)fbuf->base + vb->boff;
491                 pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT;
492                 err = videobuf_dma_init_overlay(&mem->dma,PCI_DMA_FROMDEVICE,
493                                                 bus, pages);
494                 if (0 != err)
495                         return err;
496                 break;
497         default:
498                 BUG();
499         }
500         err = videobuf_dma_map(q,&mem->dma);
501         if (0 != err)
502                 return err;
503
504         return 0;
505 }
506
507 static int __videobuf_sync(struct videobuf_queue *q,
508                            struct videobuf_buffer *buf)
509 {
510         struct videbuf_pci_sg_memory *mem=buf->priv;
511         BUG_ON (!mem);
512         MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
513
514         return  videobuf_dma_sync(q,&mem->dma);
515 }
516
517 static int __videobuf_mmap_free(struct videobuf_queue *q)
518 {
519         int i;
520
521         for (i = 0; i < VIDEO_MAX_FRAME; i++) {
522                 if (q->bufs[i]) {
523                         struct videbuf_pci_sg_memory *mem=q->bufs[i]->priv;
524                         if (mem && mem->map)
525                                 return -EBUSY;
526                 }
527         }
528
529         return 0;
530 }
531
532 static int __videobuf_mmap_mapper(struct videobuf_queue *q,
533                          struct vm_area_struct *vma)
534 {
535         struct videbuf_pci_sg_memory *mem;
536         struct videobuf_mapping *map;
537         unsigned int first,last,size,i;
538         int retval;
539
540         retval = -EINVAL;
541         if (!(vma->vm_flags & VM_WRITE)) {
542                 dprintk(1,"mmap app bug: PROT_WRITE please\n");
543                 goto done;
544         }
545         if (!(vma->vm_flags & VM_SHARED)) {
546                 dprintk(1,"mmap app bug: MAP_SHARED please\n");
547                 goto done;
548         }
549
550         /* look for first buffer to map */
551         for (first = 0; first < VIDEO_MAX_FRAME; first++) {
552                 if (NULL == q->bufs[first])
553                         continue;
554                 mem=q->bufs[first]->priv;
555                 BUG_ON (!mem);
556                 MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
557
558                 if (V4L2_MEMORY_MMAP != q->bufs[first]->memory)
559                         continue;
560                 if (q->bufs[first]->boff == (vma->vm_pgoff << PAGE_SHIFT))
561                         break;
562         }
563         if (VIDEO_MAX_FRAME == first) {
564                 dprintk(1,"mmap app bug: offset invalid [offset=0x%lx]\n",
565                         (vma->vm_pgoff << PAGE_SHIFT));
566                 goto done;
567         }
568
569         /* look for last buffer to map */
570         for (size = 0, last = first; last < VIDEO_MAX_FRAME; last++) {
571                 if (NULL == q->bufs[last])
572                         continue;
573                 if (V4L2_MEMORY_MMAP != q->bufs[last]->memory)
574                         continue;
575                 mem=q->bufs[last]->priv;
576                 if (mem->map) {
577                         retval = -EBUSY;
578                         goto done;
579                 }
580                 size += q->bufs[last]->bsize;
581                 if (size == (vma->vm_end - vma->vm_start))
582                         break;
583         }
584         if (VIDEO_MAX_FRAME == last) {
585                 dprintk(1,"mmap app bug: size invalid [size=0x%lx]\n",
586                         (vma->vm_end - vma->vm_start));
587                 goto done;
588         }
589
590         /* create mapping + update buffer list */
591         retval = -ENOMEM;
592         map = kmalloc(sizeof(struct videobuf_mapping),GFP_KERNEL);
593         if (NULL == map)
594                 goto done;
595         for (size = 0, i = first; i <= last; size += q->bufs[i++]->bsize) {
596                 mem=q->bufs[i]->priv;
597                 mem->map   = map;
598                 q->bufs[i]->baddr = vma->vm_start + size;
599         }
600         map->count    = 1;
601         map->start    = vma->vm_start;
602         map->end      = vma->vm_end;
603         map->q        = q;
604         vma->vm_ops   = &videobuf_vm_ops;
605         vma->vm_flags |= VM_DONTEXPAND | VM_RESERVED;
606         vma->vm_flags &= ~VM_IO; /* using shared anonymous pages */
607         vma->vm_private_data = map;
608         dprintk(1,"mmap %p: q=%p %08lx-%08lx pgoff %08lx bufs %d-%d\n",
609                 map,q,vma->vm_start,vma->vm_end,vma->vm_pgoff,first,last);
610         retval = 0;
611
612  done:
613         return retval;
614 }
615
616 static int __videobuf_is_mmapped (struct videobuf_buffer *buf)
617 {
618         struct videbuf_pci_sg_memory *mem=buf->priv;
619
620         BUG_ON (!mem);
621         MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
622
623         return (mem->map)?1:0;
624 }
625
626 static int __videobuf_copy_to_user ( struct videobuf_queue *q,
627                                 char __user *data, size_t count,
628                                 int nonblocking )
629 {
630         struct videbuf_pci_sg_memory *mem=q->read_buf->priv;
631         BUG_ON (!mem);
632         MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
633
634         /* copy to userspace */
635         if (count > q->read_buf->size - q->read_off)
636                 count = q->read_buf->size - q->read_off;
637
638         if (copy_to_user(data, mem->dma.vmalloc+q->read_off, count))
639                 return -EFAULT;
640
641         return count;
642 }
643
644 static int __videobuf_copy_stream ( struct videobuf_queue *q,
645                                 char __user *data, size_t count, size_t pos,
646                                 int vbihack, int nonblocking )
647 {
648         unsigned int  *fc;
649         struct videbuf_pci_sg_memory *mem=q->read_buf->priv;
650         BUG_ON (!mem);
651         MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
652
653         if (vbihack) {
654                 /* dirty, undocumented hack -- pass the frame counter
655                         * within the last four bytes of each vbi data block.
656                         * We need that one to maintain backward compatibility
657                         * to all vbi decoding software out there ... */
658                 fc  = (unsigned int*)mem->dma.vmalloc;
659                 fc += (q->read_buf->size>>2) -1;
660                 *fc = q->read_buf->field_count >> 1;
661                 dprintk(1,"vbihack: %d\n",*fc);
662         }
663
664         /* copy stuff using the common method */
665         count = __videobuf_copy_to_user (q,data,count,nonblocking);
666
667         if ( (count==-EFAULT) && (0 == pos) )
668                 return -EFAULT;
669
670         return count;
671 }
672
673 static struct videobuf_qtype_ops pci_ops = {
674         .magic        = MAGIC_QTYPE_OPS,
675
676         .alloc        = __videobuf_alloc,
677         .iolock       = __videobuf_iolock,
678         .sync         = __videobuf_sync,
679         .mmap_free    = __videobuf_mmap_free,
680         .mmap_mapper  = __videobuf_mmap_mapper,
681         .is_mmapped   = __videobuf_is_mmapped,
682         .copy_to_user = __videobuf_copy_to_user,
683         .copy_stream  = __videobuf_copy_stream,
684 };
685
686 void *videobuf_pci_alloc (size_t size)
687 {
688         struct videobuf_queue q;
689
690         /* Required to make generic handler to call __videobuf_alloc */
691         q.int_ops=&pci_ops;
692
693         q.msize=size;
694
695         return videobuf_alloc (&q);
696 }
697
698 void videobuf_queue_pci_init(struct videobuf_queue* q,
699                          struct videobuf_queue_ops *ops,
700                          void *dev,
701                          spinlock_t *irqlock,
702                          enum v4l2_buf_type type,
703                          enum v4l2_field field,
704                          unsigned int msize,
705                          void *priv)
706 {
707         struct videobuf_dma_sg_ops *priv_ops;
708
709         videobuf_queue_init(q, ops, dev, irqlock, type, field, msize, priv);
710         q->int_ops=&pci_ops;
711
712         /* FIXME: the code bellow should be removed after having a proper
713          * memory allocation method for vivi and tm6000
714          */
715         q->priv_ops= kzalloc(sizeof(struct videobuf_dma_sg_ops), GFP_KERNEL);
716         BUG_ON (!q->priv_ops);
717
718         priv_ops=q->priv_ops;
719
720         /* Sets default methods for handling Scatter Gather mapping */
721         priv_ops->vb_map_sg=(vb_map_sg_t *)pci_map_sg;
722         priv_ops->vb_unmap_sg=(vb_map_sg_t *)pci_unmap_sg;
723         priv_ops->vb_dma_sync_sg=(vb_map_sg_t *)pci_dma_sync_sg_for_cpu;
724 }
725
726 void videobuf_set_pci_ops (struct videobuf_queue* q,
727                                 struct videobuf_dma_sg_ops *ops)
728 {
729         kfree (q->priv_ops);
730
731         q->priv_ops=ops;
732
733         if (!ops)
734                 return;
735
736         /* If not specified, defaults to PCI map sg */
737         if (!ops->vb_map_sg)
738                 ops->vb_map_sg=(vb_map_sg_t *)pci_map_sg;
739
740         if (!ops->vb_dma_sync_sg)
741                 ops->vb_dma_sync_sg=(vb_map_sg_t *)pci_dma_sync_sg_for_cpu;
742         if (!ops->vb_unmap_sg)
743                 ops->vb_unmap_sg=(vb_map_sg_t *)pci_unmap_sg;
744 }
745
746
747 /* --------------------------------------------------------------------- */
748
749 EXPORT_SYMBOL_GPL(videobuf_vmalloc_to_sg);
750
751 EXPORT_SYMBOL_GPL(videobuf_to_dma);
752 EXPORT_SYMBOL_GPL(videobuf_dma_init);
753 EXPORT_SYMBOL_GPL(videobuf_dma_init_user);
754 EXPORT_SYMBOL_GPL(videobuf_dma_init_kernel);
755 EXPORT_SYMBOL_GPL(videobuf_dma_init_overlay);
756 EXPORT_SYMBOL_GPL(videobuf_dma_map);
757 EXPORT_SYMBOL_GPL(videobuf_dma_sync);
758 EXPORT_SYMBOL_GPL(videobuf_dma_unmap);
759 EXPORT_SYMBOL_GPL(videobuf_dma_free);
760
761 EXPORT_SYMBOL_GPL(videobuf_pci_dma_map);
762 EXPORT_SYMBOL_GPL(videobuf_pci_dma_unmap);
763 EXPORT_SYMBOL_GPL(videobuf_pci_alloc);
764
765 EXPORT_SYMBOL_GPL(videobuf_queue_pci_init);
766 EXPORT_SYMBOL_GPL(videobuf_set_pci_ops);
767
768 /*
769  * Local variables:
770  * c-basic-offset: 8
771  * End:
772  */