+/*
+ * mmap the DMA buffer on RAM
+ */
+static int snd_pcm_default_mmap(snd_pcm_substream_t *substream, struct vm_area_struct *area)
+{
+ area->vm_ops = &snd_pcm_vm_ops_data;
+ area->vm_private_data = substream;
+ area->vm_flags |= VM_RESERVED;
+ atomic_inc(&substream->runtime->mmap_count);
+ return 0;
+}
+
+/*
+ * mmap the DMA buffer on I/O memory area
+ */
+#if SNDRV_PCM_INFO_MMAP_IOMEM
+static struct vm_operations_struct snd_pcm_vm_ops_data_mmio =
+{
+ .open = snd_pcm_mmap_data_open,
+ .close = snd_pcm_mmap_data_close,
+};
+
+int snd_pcm_lib_mmap_iomem(snd_pcm_substream_t *substream, struct vm_area_struct *area)
+{
+ long size;
+ unsigned long offset;
+
+#ifdef pgprot_noncached
+ area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
+#endif
+ area->vm_ops = &snd_pcm_vm_ops_data_mmio;
+ area->vm_flags |= VM_IO;
+ size = area->vm_end - area->vm_start;
+ offset = area->vm_pgoff << PAGE_SHIFT;
+ if (io_remap_page_range(area, area->vm_start,
+ substream->runtime->dma_addr + offset,
+ size, area->vm_page_prot))
+ return -EAGAIN;
+ atomic_inc(&substream->runtime->mmap_count);
+ return 0;
+}
+#endif /* SNDRV_PCM_INFO_MMAP */
+
+/*
+ * mmap DMA buffer
+ */