summaryrefslogtreecommitdiff
path: root/drivers/media/video/videobuf-dma-sg.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/media/video/videobuf-dma-sg.c')
-rw-r--r--drivers/media/video/videobuf-dma-sg.c772
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:
+ */
generated by cgit v1.2.3-58-ga151 (git 2.39.0) at 2024-12-23 02:48:54 +0000