diff options
Diffstat (limited to 'sound/core/memalloc.c')
| -rw-r--r-- | sound/core/memalloc.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/sound/core/memalloc.c b/sound/core/memalloc.c index ad68bcdf82cf..bdcb9230acf8 100644 --- a/sound/core/memalloc.c +++ b/sound/core/memalloc.c @@ -128,6 +128,23 @@ void snd_dma_free_pages(struct snd_dma_buffer *dmab) EXPORT_SYMBOL(snd_dma_free_pages); /** + * snd_dma_buffer_mmap - perform mmap of the given DMA buffer + * @dmab: buffer allocation information + * @area: VM area information + */ +int snd_dma_buffer_mmap(struct snd_dma_buffer *dmab, + struct vm_area_struct *area) +{ + const struct snd_malloc_ops *ops = snd_dma_get_ops(dmab); + + if (ops && ops->mmap) + return ops->mmap(dmab, area); + else + return -ENOENT; +} +EXPORT_SYMBOL(snd_dma_buffer_mmap); + +/** * snd_sgbuf_get_addr - return the physical address at the corresponding offset * @dmab: buffer allocation information * @offset: offset in the ring buffer @@ -283,9 +300,20 @@ static void snd_dma_iram_free(struct snd_dma_buffer *dmab) gen_pool_free(pool, (unsigned long)dmab->area, dmab->bytes); } +static int snd_dma_iram_mmap(struct snd_dma_buffer *dmab, + struct vm_area_struct *area) +{ + area->vm_page_prot = pgprot_writecombine(area->vm_page_prot); + return remap_pfn_range(area, area->vm_start, + dmab->addr >> PAGE_SHIFT, + area->vm_end - area->vm_start, + area->vm_page_prot); +} + static const struct snd_malloc_ops snd_dma_iram_ops = { .alloc = snd_dma_iram_alloc, .free = snd_dma_iram_free, + .mmap = snd_dma_iram_mmap, }; #endif /* CONFIG_GENERIC_ALLOCATOR */ @@ -320,9 +348,17 @@ static void snd_dma_dev_free(struct snd_dma_buffer *dmab) dma_free_coherent(dmab->dev.dev, dmab->bytes, dmab->area, dmab->addr); } +static int snd_dma_dev_mmap(struct snd_dma_buffer *dmab, + struct vm_area_struct *area) +{ + return dma_mmap_coherent(dmab->dev.dev, area, + dmab->area, dmab->addr, dmab->bytes); +} + static const struct snd_malloc_ops snd_dma_dev_ops = { .alloc = snd_dma_dev_alloc, .free = snd_dma_dev_free, + .mmap = snd_dma_dev_mmap, }; #endif /* CONFIG_HAS_DMA */ |