[PATCH 16/16] alsa sound support for mips

[tiansm@lemote.com]

From: Fuxin Zhang <zhangfx@lemote.com>

Signed-off-by: Fuxin Zhang <zhangfx@lemote.com>
---
 sound/core/pcm_native.c |   10 ++++++++++
 sound/core/sgbuf.c      |    9 +++++++++
 2 files changed, 19 insertions(+), 0 deletions(-)

diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index 3e276fc..9005bac 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -3145,7 +3145,11 @@ static struct page *snd_pcm_mmap_data_nopage(struct 
vm_area_struct *area,
                        return NOPAGE_OOM; /* XXX: is this really due to OOM? */
        } else {
                vaddr = runtime->dma_area + offset;
+#if defined(__mips__) && defined(CONFIG_DMA_NONCOHERENT)
+               page = virt_to_page(CAC_ADDR(vaddr));
+#else
                page = virt_to_page(vaddr);
+#endif
        }
        get_page(page);
        if (type)
@@ -3261,6 +3265,12 @@ static int snd_pcm_mmap(struct file *file, struct 
vm_area_struct *area)
        substream = pcm_file->substream;
        snd_assert(substream != NULL, return -ENXIO);
 
+#if defined(__mips__) && defined(CONFIG_DMA_NONCOHERENT)
+       /* all mmap using uncached mode */
+       area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
+       area->vm_flags |= ( VM_RESERVED | VM_IO);
+#endif
+
        offset = area->vm_pgoff << PAGE_SHIFT;
        switch (offset) {
        case SNDRV_PCM_MMAP_OFFSET_STATUS:
diff --git a/sound/core/sgbuf.c b/sound/core/sgbuf.c
index cefd228..535f0bc 100644
--- a/sound/core/sgbuf.c
+++ b/sound/core/sgbuf.c
@@ -91,12 +91,21 @@ void *snd_malloc_sgbuf_pages(struct device *device,
                }
                sgbuf->table[i].buf = tmpb.area;
                sgbuf->table[i].addr = tmpb.addr;
+#if defined(__mips__) && defined(CONFIG_DMA_NONCOHERENT)
+               sgbuf->page_table[i] = virt_to_page(CAC_ADDR(tmpb.area));
+#else
                sgbuf->page_table[i] = virt_to_page(tmpb.area);
+#endif
                sgbuf->pages++;
        }
 
        sgbuf->size = size;
+#if defined(__mips__) && defined(CONFIG_DMA_NONCOHERENT)
+       /* maybe we should use uncached accelerated mode */
+       dmab->area = vmap(sgbuf->page_table, sgbuf->pages, VM_MAP | VM_IO, 
pgprot_noncached(PAGE_KERNEL));
+#else
        dmab->area = vmap(sgbuf->page_table, sgbuf->pages, VM_MAP, PAGE_KERNEL);
+#endif
        if (! dmab->area)
                goto _failed;
        return dmab->area;
-- 
1.4.4.1