[ARM] Add DMA mmap support for SA1100/PXA framebuffer drivers.

Since the framebuffers are allocated via dma_alloc_writecombine() we
should use the DMA mmap interface to map these buffers.
Signed-off-by: Russell King <rmk@arm.linux.org.uk>

drivers/video/pxafb.c

@@ -394,6 +394,20 @@ static int pxafb_blank(int blank, struct fb_info *info)
 	return 0;
 }
 
+static int pxafb_mmap(struct fb_info *info, struct file *file,
+		      struct vm_area_struct *vma)
+{
+	struct pxafb_info *fbi = (struct pxafb_info *)info;
+	unsigned long off = vma->vm_pgoff << PAGE_SHIFT;
+
+	if (off < info->fix.smem_len) {
+		vma->vm_pgoff += 1;
+		return dma_mmap_writecombine(fbi->dev, vma, fbi->map_cpu,
+					     fbi->map_dma, fbi->map_size);
+	}
+	return -EINVAL;
+}
+
 static struct fb_ops pxafb_ops = {
 	.owner		= THIS_MODULE,
 	.fb_check_var	= pxafb_check_var,
@@ -404,6 +418,7 @@ static struct fb_ops pxafb_ops = {
 	.fb_imageblit	= cfb_imageblit,
 	.fb_blank	= pxafb_blank,
 	.fb_cursor	= soft_cursor,
+	.fb_mmap	= pxafb_mmap,
 };
 
 /*

drivers/video/sa1100fb.c

@@ -814,6 +814,33 @@ static int sa1100fb_blank(int blank, struct fb_info *info)
 	return 0;
 }
 
+static int sa1100fb_mmap(struct fb_info *info, struct file *file,
+			 struct vm_area_struct *vma)
+{
+	struct sa1100fb_info *fbi = (struct sa1100fb_info *)info;
+	unsigned long start, len, off = vma->vm_pgoff << PAGE_SHIFT;
+
+	if (off < info->fix.smem_len) {
+		vma->vm_pgoff += 1; /* skip over the palette */
+		return dma_mmap_writecombine(fbi->dev, vma, fbi->map_cpu,
+					     fbi->map_dma, fbi->map_size);
+	}
+
+	start = info->fix.mmio_start;
+	len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
+
+	if ((vma->vm_end - vma->vm_start + off) > len)
+		return -EINVAL;
+
+	off += start & PAGE_MASK;
+	vma->vm_pgoff = off >> PAGE_SHIFT;
+	vma->vm_flags |= VM_IO;
+	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+	return io_remap_page_range(vma, vma->vm_start, off,
+				   vma->vm_end - vma->vm_start,
+				   vma->vm_page_prot);
+}
+
 static struct fb_ops sa1100fb_ops = {
 	.owner		= THIS_MODULE,
 	.fb_check_var	= sa1100fb_check_var,
@@ -825,6 +852,7 @@ static struct fb_ops sa1100fb_ops = {
 	.fb_imageblit	= cfb_imageblit,
 	.fb_blank	= sa1100fb_blank,
 	.fb_cursor	= soft_cursor,
+	.fb_mmap	= sa1100fb_mmap,
 };
 
 /*