1 files changed, 772 insertions, 0 deletions

diff --git a/drivers/media/video/videobuf-dma-sg.c b/drivers/media/video/videobuf-dma-sg.c
new file mode 100644
index 000000000000..3345877c47d4
--- /dev/null
+++ b/drivers/media/video/videobuf-dma-sg.c
@@ -0,0 +1,772 @@
+/*
+ * helper functions for PCI DMA video4linux capture buffers
+ *
+ * The functions expect the hardware being able to scatter gatter
+ * (i.e. the buffers are not linear in physical memory, but fragmented
+ * into PAGE_SIZE chunks).  They also assume the driver does not need
+ * to touch the video data.
+ *
+ * (c) 2007 Mauro Carvalho Chehab, <mchehab@infradead.org>
+ *
+ * Highly based on video-buf written originally by:
+ * (c) 2001,02 Gerd Knorr <kraxel@bytesex.org>
+ * (c) 2006 Mauro Carvalho Chehab, <mchehab@infradead.org>
+ * (c) 2006 Ted Walther and John Sokol
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+
+#include <linux/pci.h>
+#include <linux/vmalloc.h>
+#include <linux/pagemap.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+
+#include <media/videobuf-dma-sg.h>
+
+#define MAGIC_DMABUF 0x19721112
+#define MAGIC_SG_MEM 0x17890714
+
+#define MAGIC_CHECK(is,should)  if (unlikely((is) != (should))) \
+        { printk(KERN_ERR "magic mismatch: %x (expected %x)\n",is,should); BUG(); }
+
+static int debug = 0;
+module_param(debug, int, 0644);
+
+MODULE_DESCRIPTION("helper module to manage video4linux pci dma sg buffers");
+MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
+MODULE_LICENSE("GPL");
+
+#define dprintk(level, fmt, arg...)     if (debug >= level) \
+        printk(KERN_DEBUG "vbuf-sg: " fmt , ## arg)
+
+/* --------------------------------------------------------------------- */
+
+struct scatterlist*
+videobuf_vmalloc_to_sg(unsigned char *virt, int nr_pages)
+{
+        struct scatterlist *sglist;
+        struct page *pg;
+        int i;
+
+        sglist = kcalloc(nr_pages, sizeof(struct scatterlist), GFP_KERNEL);
+        if (NULL == sglist)
+                return NULL;
+        for (i = 0; i < nr_pages; i++, virt += PAGE_SIZE) {
+                pg = vmalloc_to_page(virt);
+                if (NULL == pg)
+                        goto err;
+                BUG_ON(PageHighMem(pg));
+                sglist[i].page   = pg;
+                sglist[i].length = PAGE_SIZE;
+        }
+        return sglist;
+
+ err:
+        kfree(sglist);
+        return NULL;
+}
+
+struct scatterlist*
+videobuf_pages_to_sg(struct page **pages, int nr_pages, int offset)
+{
+        struct scatterlist *sglist;
+        int i = 0;
+
+        if (NULL == pages[0])
+                return NULL;
+        sglist = kcalloc(nr_pages, sizeof(*sglist), GFP_KERNEL);
+        if (NULL == sglist)
+                return NULL;
+
+        if (NULL == pages[0])
+                goto nopage;
+        if (PageHighMem(pages[0]))
+                /* DMA to highmem pages might not work */
+                goto highmem;
+        sglist[0].page   = pages[0];
+        sglist[0].offset = offset;
+        sglist[0].length = PAGE_SIZE - offset;
+        for (i = 1; i < nr_pages; i++) {
+                if (NULL == pages[i])
+                        goto nopage;
+                if (PageHighMem(pages[i]))
+                        goto highmem;
+                sglist[i].page   = pages[i];
+                sglist[i].length = PAGE_SIZE;
+        }
+        return sglist;
+
+ nopage:
+        dprintk(2,"sgl: oops - no page\n");
+        kfree(sglist);
+        return NULL;
+
+ highmem:
+        dprintk(2,"sgl: oops - highmem page\n");
+        kfree(sglist);
+        return NULL;
+}
+
+/* --------------------------------------------------------------------- */
+
+struct videobuf_dmabuf *videobuf_to_dma (struct videobuf_buffer *buf)
+{
+        struct videbuf_pci_sg_memory *mem=buf->priv;
+        BUG_ON (!mem);
+
+        MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
+
+        return &mem->dma;
+}
+
+void videobuf_dma_init(struct videobuf_dmabuf *dma)
+{
+        memset(dma,0,sizeof(*dma));
+        dma->magic = MAGIC_DMABUF;
+}
+
+int videobuf_dma_init_user(struct videobuf_dmabuf *dma, int direction,
+                           unsigned long data, unsigned long size)
+{
+        unsigned long first,last;
+        int err, rw = 0;
+
+        dma->direction = direction;
+        switch (dma->direction) {
+        case PCI_DMA_FROMDEVICE: rw = READ;  break;
+        case PCI_DMA_TODEVICE:   rw = WRITE; break;
+        default:                 BUG();
+        }
+
+        first = (data          & PAGE_MASK) >> PAGE_SHIFT;
+        last  = ((data+size-1) & PAGE_MASK) >> PAGE_SHIFT;
+        dma->offset   = data & ~PAGE_MASK;
+        dma->nr_pages = last-first+1;
+        dma->pages = kmalloc(dma->nr_pages * sizeof(struct page*),
+                             GFP_KERNEL);
+        if (NULL == dma->pages)
+                return -ENOMEM;
+        dprintk(1,"init user [0x%lx+0x%lx => %d pages]\n",
+                data,size,dma->nr_pages);
+
+        dma->varea = (void *) data;
+
+        down_read(&current->mm->mmap_sem);
+        err = get_user_pages(current,current->mm,
+                             data & PAGE_MASK, dma->nr_pages,
+                             rw == READ, 1, /* force */
+                             dma->pages, NULL);
+        up_read(&current->mm->mmap_sem);
+        if (err != dma->nr_pages) {
+                dma->nr_pages = (err >= 0) ? err : 0;
+                dprintk(1,"get_user_pages: err=%d [%d]\n",err,dma->nr_pages);
+                return err < 0 ? err : -EINVAL;
+        }
+        return 0;
+}
+
+int videobuf_dma_init_kernel(struct videobuf_dmabuf *dma, int direction,
+                             int nr_pages)
+{
+        dprintk(1,"init kernel [%d pages]\n",nr_pages);
+        dma->direction = direction;
+        dma->vmalloc = vmalloc_32(nr_pages << PAGE_SHIFT);
+        if (NULL == dma->vmalloc) {
+                dprintk(1,"vmalloc_32(%d pages) failed\n",nr_pages);
+                return -ENOMEM;
+        }
+        dprintk(1,"vmalloc is at addr 0x%08lx, size=%d\n",
+                                (unsigned long)dma->vmalloc,
+                                nr_pages << PAGE_SHIFT);
+        memset(dma->vmalloc,0,nr_pages << PAGE_SHIFT);
+        dma->nr_pages = nr_pages;
+        return 0;
+}
+
+int videobuf_dma_init_overlay(struct videobuf_dmabuf *dma, int direction,
+                              dma_addr_t addr, int nr_pages)
+{
+        dprintk(1,"init overlay [%d pages @ bus 0x%lx]\n",
+                nr_pages,(unsigned long)addr);
+        dma->direction = direction;
+        if (0 == addr)
+                return -EINVAL;
+
+        dma->bus_addr = addr;
+        dma->nr_pages = nr_pages;
+        return 0;
+}
+
+int videobuf_dma_map(struct videobuf_queue* q,struct videobuf_dmabuf *dma)
+{
+        void                   *dev=q->dev;
+        struct videobuf_dma_sg_ops *ops=q->priv_ops;
+
+        MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
+        BUG_ON(0 == dma->nr_pages);
+
+        if (dma->pages) {
+                dma->sglist = videobuf_pages_to_sg(dma->pages, dma->nr_pages,
+                                                   dma->offset);
+        }
+        if (dma->vmalloc) {
+                dma->sglist = videobuf_vmalloc_to_sg
+                                                (dma->vmalloc,dma->nr_pages);
+        }
+        if (dma->bus_addr) {
+                dma->sglist = kmalloc(sizeof(struct scatterlist), GFP_KERNEL);
+                if (NULL != dma->sglist) {
+                        dma->sglen  = 1;
+                        sg_dma_address(&dma->sglist[0]) = dma->bus_addr & PAGE_MASK;
+                        dma->sglist[0].offset           = dma->bus_addr & ~PAGE_MASK;
+                        sg_dma_len(&dma->sglist[0])     = dma->nr_pages * PAGE_SIZE;
+                }
+        }
+        if (NULL == dma->sglist) {
+                dprintk(1,"scatterlist is NULL\n");
+                return -ENOMEM;
+        }
+        if (!dma->bus_addr) {
+                if (ops && ops->vb_map_sg) {
+                        dma->sglen = ops->vb_map_sg(dev,dma->sglist,
+                                        dma->nr_pages, dma->direction);
+                }
+                if (0 == dma->sglen) {
+                        printk(KERN_WARNING
+                               "%s: videobuf_map_sg failed\n",__FUNCTION__);
+                        kfree(dma->sglist);
+                        dma->sglist = NULL;
+                        dma->sglen = 0;
+                        return -EIO;
+                }
+        }
+        return 0;
+}
+
+int videobuf_dma_sync(struct videobuf_queue *q,struct videobuf_dmabuf *dma)
+{
+        void                   *dev=q->dev;
+        struct videobuf_dma_sg_ops *ops=q->priv_ops;
+
+        MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
+        BUG_ON(!dma->sglen);
+
+        if (!dma->bus_addr && ops && ops->vb_dma_sync_sg)
+                ops->vb_dma_sync_sg(dev,dma->sglist,dma->nr_pages,
+                                                        dma->direction);
+
+        return 0;
+}
+
+int videobuf_dma_unmap(struct videobuf_queue* q,struct videobuf_dmabuf *dma)
+{
+        void                   *dev=q->dev;
+        struct videobuf_dma_sg_ops *ops=q->priv_ops;
+
+        MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
+        if (!dma->sglen)
+                return 0;
+
+        if (!dma->bus_addr && ops && ops->vb_unmap_sg)
+                        ops->vb_unmap_sg(dev,dma->sglist,dma->nr_pages,
+                                                        dma->direction);
+        kfree(dma->sglist);
+        dma->sglist = NULL;
+        dma->sglen = 0;
+        return 0;
+}
+
+int videobuf_dma_free(struct videobuf_dmabuf *dma)
+{
+        MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
+        BUG_ON(dma->sglen);
+
+        if (dma->pages) {
+                int i;
+                for (i=0; i < dma->nr_pages; i++)
+                        page_cache_release(dma->pages[i]);
+                kfree(dma->pages);
+                dma->pages = NULL;
+        }
+
+        vfree(dma->vmalloc);
+        dma->vmalloc = NULL;
+        dma->varea = NULL;
+
+        if (dma->bus_addr) {
+                dma->bus_addr = 0;
+        }
+        dma->direction = PCI_DMA_NONE;
+        return 0;
+}
+
+/* --------------------------------------------------------------------- */
+
+int videobuf_pci_dma_map(struct pci_dev *pci,struct videobuf_dmabuf *dma)
+{
+        struct videobuf_queue q;
+        struct videobuf_dma_sg_ops qops;
+
+        q.dev=pci;
+        qops.vb_map_sg=(vb_map_sg_t *)pci_map_sg;
+        qops.vb_unmap_sg=(vb_map_sg_t *)pci_unmap_sg;
+        q.priv_ops = &qops;
+
+        return (videobuf_dma_map(&q,dma));
+}
+
+int videobuf_pci_dma_unmap(struct pci_dev *pci,struct videobuf_dmabuf *dma)
+{
+        struct videobuf_queue q;
+        struct videobuf_dma_sg_ops qops;
+
+        q.dev=pci;
+        qops.vb_map_sg=(vb_map_sg_t *)pci_map_sg;
+        qops.vb_unmap_sg=(vb_map_sg_t *)pci_unmap_sg;
+        q.priv_ops = &qops;
+
+        return (videobuf_dma_unmap(&q,dma));
+}
+
+/* --------------------------------------------------------------------- */
+
+static void
+videobuf_vm_open(struct vm_area_struct *vma)
+{
+        struct videobuf_mapping *map = vma->vm_private_data;
+
+        dprintk(2,"vm_open %p [count=%d,vma=%08lx-%08lx]\n",map,
+                map->count,vma->vm_start,vma->vm_end);
+        map->count++;
+}
+
+static void
+videobuf_vm_close(struct vm_area_struct *vma)
+{
+        struct videobuf_mapping *map = vma->vm_private_data;
+        struct videobuf_queue *q = map->q;
+        struct videbuf_pci_sg_memory *mem;
+        int i;
+
+        dprintk(2,"vm_close %p [count=%d,vma=%08lx-%08lx]\n",map,
+                map->count,vma->vm_start,vma->vm_end);
+
+        map->count--;
+        if (0 == map->count) {
+                dprintk(1,"munmap %p q=%p\n",map,q);
+                mutex_lock(&q->lock);
+                for (i = 0; i < VIDEO_MAX_FRAME; i++) {
+                        if (NULL == q->bufs[i])
+                                continue;
+                        mem=q->bufs[i]->priv;
+
+                        if (!mem)
+                                continue;
+
+                        MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
+
+                        if (mem->map != map)
+                                continue;
+                        mem->map   = NULL;
+                        q->bufs[i]->baddr = 0;
+                        q->ops->buf_release(q,q->bufs[i]);
+                }
+                mutex_unlock(&q->lock);
+                kfree(map);
+        }
+        return;
+}
+
+/*
+ * Get a anonymous page for the mapping.  Make sure we can DMA to that
+ * memory location with 32bit PCI devices (i.e. don't use highmem for
+ * now ...).  Bounce buffers don't work very well for the data rates
+ * video capture has.
+ */
+static struct page*
+videobuf_vm_nopage(struct vm_area_struct *vma, unsigned long vaddr,
+                   int *type)
+{
+        struct page *page;
+
+        dprintk(3,"nopage: fault @ %08lx [vma %08lx-%08lx]\n",
+                vaddr,vma->vm_start,vma->vm_end);
+        if (vaddr > vma->vm_end)
+                return NOPAGE_SIGBUS;
+        page = alloc_page(GFP_USER | __GFP_DMA32);
+        if (!page)
+                return NOPAGE_OOM;
+        clear_user_page(page_address(page), vaddr, page);
+        if (type)
+                *type = VM_FAULT_MINOR;
+        return page;
+}
+
+static struct vm_operations_struct videobuf_vm_ops =
+{
+        .open     = videobuf_vm_open,
+        .close    = videobuf_vm_close,
+        .nopage   = videobuf_vm_nopage,
+};
+
+/* ---------------------------------------------------------------------
+ * PCI handlers for the generic methods
+ */
+
+/* Allocated area consists on 3 parts:
+        struct video_buffer
+        struct <driver>_buffer (cx88_buffer, saa7134_buf, ...)
+        struct videobuf_pci_sg_memory
+ */
+
+static void *__videobuf_alloc(size_t size)
+{
+        struct videbuf_pci_sg_memory *mem;
+        struct videobuf_buffer *vb;
+
+        vb = kzalloc(size+sizeof(*mem),GFP_KERNEL);
+
+        mem = vb->priv = ((char *)vb)+size;
+        mem->magic=MAGIC_SG_MEM;
+
+        videobuf_dma_init(&mem->dma);
+
+        dprintk(1,"%s: allocated at %p(%ld+%ld) & %p(%ld)\n",
+                __FUNCTION__,vb,(long)sizeof(*vb),(long)size-sizeof(*vb),
+                mem,(long)sizeof(*mem));
+
+        return vb;
+}
+
+static int __videobuf_iolock (struct videobuf_queue* q,
+                              struct videobuf_buffer *vb,
+                              struct v4l2_framebuffer *fbuf)
+{
+        int err,pages;
+        dma_addr_t bus;
+        struct videbuf_pci_sg_memory *mem=vb->priv;
+        BUG_ON(!mem);
+
+        MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
+
+        switch (vb->memory) {
+        case V4L2_MEMORY_MMAP:
+        case V4L2_MEMORY_USERPTR:
+                if (0 == vb->baddr) {
+                        /* no userspace addr -- kernel bounce buffer */
+                        pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT;
+                        err = videobuf_dma_init_kernel( &mem->dma,
+                                                        PCI_DMA_FROMDEVICE,
+                                                        pages );
+                        if (0 != err)
+                                return err;
+                } else {
+                        /* dma directly to userspace */
+                        err = videobuf_dma_init_user( &mem->dma,
+                                                      PCI_DMA_FROMDEVICE,
+                                                      vb->baddr,vb->bsize );
+                        if (0 != err)
+                                return err;
+                }
+                break;
+        case V4L2_MEMORY_OVERLAY:
+                if (NULL == fbuf)
+                        return -EINVAL;
+                /* FIXME: need sanity checks for vb->boff */
+                /*
+                 * Using a double cast to avoid compiler warnings when
+                 * building for PAE. Compiler doesn't like direct casting
+                 * of a 32 bit ptr to 64 bit integer.
+                 */
+                bus   = (dma_addr_t)(unsigned long)fbuf->base + vb->boff;
+                pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT;
+                err = videobuf_dma_init_overlay(&mem->dma,PCI_DMA_FROMDEVICE,
+                                                bus, pages);
+                if (0 != err)
+                        return err;
+                break;
+        default:
+                BUG();
+        }
+        err = videobuf_dma_map(q,&mem->dma);
+        if (0 != err)
+                return err;
+
+        return 0;
+}
+
+static int __videobuf_sync(struct videobuf_queue *q,
+                           struct videobuf_buffer *buf)
+{
+        struct videbuf_pci_sg_memory *mem=buf->priv;
+        BUG_ON (!mem);
+        MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
+
+        return  videobuf_dma_sync(q,&mem->dma);
+}
+
+static int __videobuf_mmap_free(struct videobuf_queue *q)
+{
+        int i;
+
+        for (i = 0; i < VIDEO_MAX_FRAME; i++) {
+                if (q->bufs[i]) {
+                        struct videbuf_pci_sg_memory *mem=q->bufs[i]->priv;
+                        if (mem && mem->map)
+                                return -EBUSY;
+                }
+        }
+
+        return 0;
+}
+
+static int __videobuf_mmap_mapper(struct videobuf_queue *q,
+                         struct vm_area_struct *vma)
+{
+        struct videbuf_pci_sg_memory *mem;
+        struct videobuf_mapping *map;
+        unsigned int first,last,size,i;
+        int retval;
+
+        retval = -EINVAL;
+        if (!(vma->vm_flags & VM_WRITE)) {
+                dprintk(1,"mmap app bug: PROT_WRITE please\n");
+                goto done;
+        }
+        if (!(vma->vm_flags & VM_SHARED)) {
+                dprintk(1,"mmap app bug: MAP_SHARED please\n");
+                goto done;
+        }
+
+        /* look for first buffer to map */
+        for (first = 0; first < VIDEO_MAX_FRAME; first++) {
+                if (NULL == q->bufs[first])
+                        continue;
+                mem=q->bufs[first]->priv;
+                BUG_ON (!mem);
+                MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
+
+                if (V4L2_MEMORY_MMAP != q->bufs[first]->memory)
+                        continue;
+                if (q->bufs[first]->boff == (vma->vm_pgoff << PAGE_SHIFT))
+                        break;
+        }
+        if (VIDEO_MAX_FRAME == first) {
+                dprintk(1,"mmap app bug: offset invalid [offset=0x%lx]\n",
+                        (vma->vm_pgoff << PAGE_SHIFT));
+                goto done;
+        }
+
+        /* look for last buffer to map */
+        for (size = 0, last = first; last < VIDEO_MAX_FRAME; last++) {
+                if (NULL == q->bufs[last])
+                        continue;
+                if (V4L2_MEMORY_MMAP != q->bufs[last]->memory)
+                        continue;
+                mem=q->bufs[last]->priv;
+                if (mem->map) {
+                        retval = -EBUSY;
+                        goto done;
+                }
+                size += q->bufs[last]->bsize;
+                if (size == (vma->vm_end - vma->vm_start))
+                        break;
+        }
+        if (VIDEO_MAX_FRAME == last) {
+                dprintk(1,"mmap app bug: size invalid [size=0x%lx]\n",
+                        (vma->vm_end - vma->vm_start));
+                goto done;
+        }
+
+        /* create mapping + update buffer list */
+        retval = -ENOMEM;
+        map = kmalloc(sizeof(struct videobuf_mapping),GFP_KERNEL);
+        if (NULL == map)
+                goto done;
+        for (size = 0, i = first; i <= last; size += q->bufs[i++]->bsize) {
+                mem=q->bufs[i]->priv;
+                mem->map   = map;
+                q->bufs[i]->baddr = vma->vm_start + size;
+        }
+        map->count    = 1;
+        map->start    = vma->vm_start;
+        map->end      = vma->vm_end;
+        map->q        = q;
+        vma->vm_ops   = &videobuf_vm_ops;
+        vma->vm_flags |= VM_DONTEXPAND | VM_RESERVED;
+        vma->vm_flags &= ~VM_IO; /* using shared anonymous pages */
+        vma->vm_private_data = map;
+        dprintk(1,"mmap %p: q=%p %08lx-%08lx pgoff %08lx bufs %d-%d\n",
+                map,q,vma->vm_start,vma->vm_end,vma->vm_pgoff,first,last);
+        retval = 0;
+
+ done:
+        return retval;
+}
+
+static int __videobuf_is_mmapped (struct videobuf_buffer *buf)
+{
+        struct videbuf_pci_sg_memory *mem=buf->priv;
+
+        BUG_ON (!mem);
+        MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
+
+        return (mem->map)?1:0;
+}
+
+static int __videobuf_copy_to_user ( struct videobuf_queue *q,
+                                char __user *data, size_t count,
+                                int nonblocking )
+{
+        struct videbuf_pci_sg_memory *mem=q->read_buf->priv;
+        BUG_ON (!mem);
+        MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
+
+        /* copy to userspace */
+        if (count > q->read_buf->size - q->read_off)
+                count = q->read_buf->size - q->read_off;
+
+        if (copy_to_user(data, mem->dma.vmalloc+q->read_off, count))
+                return -EFAULT;
+
+        return count;
+}
+
+static int __videobuf_copy_stream ( struct videobuf_queue *q,
+                                char __user *data, size_t count, size_t pos,
+                                int vbihack, int nonblocking )
+{
+        unsigned int  *fc;
+        struct videbuf_pci_sg_memory *mem=q->read_buf->priv;
+        BUG_ON (!mem);
+        MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
+
+        if (vbihack) {
+                /* dirty, undocumented hack -- pass the frame counter
+                        * within the last four bytes of each vbi data block.
+                        * We need that one to maintain backward compatibility
+                        * to all vbi decoding software out there ... */
+                fc  = (unsigned int*)mem->dma.vmalloc;
+                fc += (q->read_buf->size>>2) -1;
+                *fc = q->read_buf->field_count >> 1;
+                dprintk(1,"vbihack: %d\n",*fc);
+        }
+
+        /* copy stuff using the common method */
+        count = __videobuf_copy_to_user (q,data,count,nonblocking);
+
+        if ( (count==-EFAULT) && (0 == pos) )
+                return -EFAULT;
+
+        return count;
+}
+
+static struct videobuf_qtype_ops pci_ops = {
+        .magic        = MAGIC_QTYPE_OPS,
+
+        .alloc        = __videobuf_alloc,
+        .iolock       = __videobuf_iolock,
+        .sync         = __videobuf_sync,
+        .mmap_free    = __videobuf_mmap_free,
+        .mmap_mapper  = __videobuf_mmap_mapper,
+        .is_mmapped   = __videobuf_is_mmapped,
+        .copy_to_user = __videobuf_copy_to_user,
+        .copy_stream  = __videobuf_copy_stream,
+};
+
+void *videobuf_pci_alloc (size_t size)
+{
+        struct videobuf_queue q;
+
+        /* Required to make generic handler to call __videobuf_alloc */
+        q.int_ops=&pci_ops;
+
+        q.msize=size;
+
+        return videobuf_alloc (&q);
+}
+
+void videobuf_queue_pci_init(struct videobuf_queue* q,
+                         struct videobuf_queue_ops *ops,
+                         void *dev,
+                         spinlock_t *irqlock,
+                         enum v4l2_buf_type type,
+                         enum v4l2_field field,
+                         unsigned int msize,
+                         void *priv)
+{
+        struct videobuf_dma_sg_ops *priv_ops;
+
+        videobuf_queue_init(q, ops, dev, irqlock, type, field, msize, priv);
+        q->int_ops=&pci_ops;
+
+        /* FIXME: the code bellow should be removed after having a proper
+         * memory allocation method for vivi and tm6000
+         */
+        q->priv_ops= kzalloc(sizeof(struct videobuf_dma_sg_ops), GFP_KERNEL);
+        BUG_ON (!q->priv_ops);
+
+        priv_ops=q->priv_ops;
+
+        /* Sets default methods for handling Scatter Gather mapping */
+        priv_ops->vb_map_sg=(vb_map_sg_t *)pci_map_sg;
+        priv_ops->vb_unmap_sg=(vb_map_sg_t *)pci_unmap_sg;
+        priv_ops->vb_dma_sync_sg=(vb_map_sg_t *)pci_dma_sync_sg_for_cpu;
+}
+
+void videobuf_set_pci_ops (struct videobuf_queue* q,
+                                struct videobuf_dma_sg_ops *ops)
+{
+        kfree (q->priv_ops);
+
+        q->priv_ops=ops;
+
+        if (!ops)
+                return;
+
+        /* If not specified, defaults to PCI map sg */
+        if (!ops->vb_map_sg)
+                ops->vb_map_sg=(vb_map_sg_t *)pci_map_sg;
+
+        if (!ops->vb_dma_sync_sg)
+                ops->vb_dma_sync_sg=(vb_map_sg_t *)pci_dma_sync_sg_for_cpu;
+        if (!ops->vb_unmap_sg)
+                ops->vb_unmap_sg=(vb_map_sg_t *)pci_unmap_sg;
+}
+
+
+/* --------------------------------------------------------------------- */
+
+EXPORT_SYMBOL_GPL(videobuf_vmalloc_to_sg);
+
+EXPORT_SYMBOL_GPL(videobuf_to_dma);
+EXPORT_SYMBOL_GPL(videobuf_dma_init);
+EXPORT_SYMBOL_GPL(videobuf_dma_init_user);
+EXPORT_SYMBOL_GPL(videobuf_dma_init_kernel);
+EXPORT_SYMBOL_GPL(videobuf_dma_init_overlay);
+EXPORT_SYMBOL_GPL(videobuf_dma_map);
+EXPORT_SYMBOL_GPL(videobuf_dma_sync);
+EXPORT_SYMBOL_GPL(videobuf_dma_unmap);
+EXPORT_SYMBOL_GPL(videobuf_dma_free);
+
+EXPORT_SYMBOL_GPL(videobuf_pci_dma_map);
+EXPORT_SYMBOL_GPL(videobuf_pci_dma_unmap);
+EXPORT_SYMBOL_GPL(videobuf_pci_alloc);
+
+EXPORT_SYMBOL_GPL(videobuf_queue_pci_init);
+EXPORT_SYMBOL_GPL(videobuf_set_pci_ops);
+
+/*
+ * Local variables:
+ * c-basic-offset: 8
+ * End:
+ */