1 files changed, 59 insertions, 24 deletions

diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index ab73edf..29ab46a1 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -26,6 +26,7 @@
 #include <linux/time.h>
 #include <linux/pm_qos_params.h>
 #include <linux/uio.h>
+#include <linux/dma-mapping.h>
 #include <sound/core.h>
 #include <sound/control.h>
 #include <sound/info.h>
@@ -3061,6 +3062,27 @@ static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file
 }
 #endif /* coherent mmap */
 
+static inline struct page *
+snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
+{
+	void *vaddr = substream->runtime->dma_area + ofs;
+#if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
+	if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
+		return virt_to_page(CAC_ADDR(vaddr));
+#endif
+#if defined(CONFIG_PPC32) && defined(CONFIG_NOT_COHERENT_CACHE)
+	if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) {
+		dma_addr_t addr = substream->runtime->dma_addr + ofs;
+		addr -= get_dma_offset(substream->dma_buffer.dev.dev);
+		/* assume dma_handle set via pfn_to_phys() in
+		 * mm/dma-noncoherent.c
+		 */
+		return pfn_to_page(addr >> PAGE_SHIFT);
+	}
+#endif
+	return virt_to_page(vaddr);
+}
+
 /*
  * fault callback for mmapping a RAM page
  */
@@ -3071,7 +3093,6 @@ static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
 	struct snd_pcm_runtime *runtime;
 	unsigned long offset;
 	struct page * page;
-	void *vaddr;
 	size_t dma_bytes;
 	
 	if (substream == NULL)
@@ -3081,36 +3102,53 @@ static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
 	dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
 	if (offset > dma_bytes - PAGE_SIZE)
 		return VM_FAULT_SIGBUS;
-	if (substream->ops->page) {
+	if (substream->ops->page)
 		page = substream->ops->page(substream, offset);
-		if (!page)
-			return VM_FAULT_SIGBUS;
-	} else {
-		vaddr = runtime->dma_area + offset;
-		page = virt_to_page(vaddr);
-	}
+	else
+		page = snd_pcm_default_page_ops(substream, offset);
+	if (!page)
+		return VM_FAULT_SIGBUS;
 	get_page(page);
 	vmf->page = page;
 	return 0;
 }
 
-static const struct vm_operations_struct snd_pcm_vm_ops_data =
-{
+static const struct vm_operations_struct snd_pcm_vm_ops_data = {
+	.open =		snd_pcm_mmap_data_open,
+	.close =	snd_pcm_mmap_data_close,
+};
+
+static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
 	.open =		snd_pcm_mmap_data_open,
 	.close =	snd_pcm_mmap_data_close,
 	.fault =	snd_pcm_mmap_data_fault,
 };
 
+#ifndef ARCH_HAS_DMA_MMAP_COHERENT
+/* This should be defined / handled globally! */
+#ifdef CONFIG_ARM
+#define ARCH_HAS_DMA_MMAP_COHERENT
+#endif
+#endif
+
 /*
  * mmap the DMA buffer on RAM
  */
 static int snd_pcm_default_mmap(struct snd_pcm_substream *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->mmap_count);
+#ifdef ARCH_HAS_DMA_MMAP_COHERENT
+	if (!substream->ops->page &&
+	    substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
+		return dma_mmap_coherent(substream->dma_buffer.dev.dev,
+					 area,
+					 substream->runtime->dma_area,
+					 substream->runtime->dma_addr,
+					 area->vm_end - area->vm_start);
+#endif /* ARCH_HAS_DMA_MMAP_COHERENT */
+	/* mmap with fault handler */
+	area->vm_ops = &snd_pcm_vm_ops_data_fault;
 	return 0;
 }
 
@@ -3118,12 +3156,6 @@ static int snd_pcm_default_mmap(struct snd_pcm_substream *substream,
  * mmap the DMA buffer on I/O memory area
  */
 #if SNDRV_PCM_INFO_MMAP_IOMEM
-static const 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(struct snd_pcm_substream *substream,
 			   struct vm_area_struct *area)
 {
@@ -3133,8 +3165,6 @@ int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
 #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_private_data = substream;
 	area->vm_flags |= VM_IO;
 	size = area->vm_end - area->vm_start;
 	offset = area->vm_pgoff << PAGE_SHIFT;
@@ -3142,7 +3172,6 @@ int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
 				(substream->runtime->dma_addr + offset) >> PAGE_SHIFT,
 				size, area->vm_page_prot))
 		return -EAGAIN;
-	atomic_inc(&substream->mmap_count);
 	return 0;
 }
 
@@ -3159,6 +3188,7 @@ int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
 	long size;
 	unsigned long offset;
 	size_t dma_bytes;
+	int err;
 
 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 		if (!(area->vm_flags & (VM_WRITE|VM_READ)))
@@ -3183,10 +3213,15 @@ int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
 	if (offset > dma_bytes - size)
 		return -EINVAL;
 
+	area->vm_ops = &snd_pcm_vm_ops_data;
+	area->vm_private_data = substream;
 	if (substream->ops->mmap)
-		return substream->ops->mmap(substream, area);
+		err = substream->ops->mmap(substream, area);
 	else
-		return snd_pcm_default_mmap(substream, area);
+		err = snd_pcm_default_mmap(substream, area);
+	if (!err)
+		atomic_inc(&substream->mmap_count);
+	return err;
 }
 
 EXPORT_SYMBOL(snd_pcm_mmap_data);