diff options
| author | Manjula Gupta <magupta@nvidia.com> | 2010-03-19 15:17:53 +0530 |
|---|---|---|
| committer | Gary King <gking@nvidia.com> | 2010-03-22 22:06:12 -0800 |
| commit | 80a7ccc42463585796202053e0d591d137094045 (patch) | |
| tree | 82682c65623fb303a6653c72d55a74d87d262055 /sound | |
| parent | bc1bb1e9d70a46b9c81835653e1495dce62ea099 (diff) | |
[ALSA]: Add mmap support in kernel driver.
Add mmap callback in alsa to support mmap mode.
For Bug:66326 [LDK/Whistler/ALSA] Add the mmap
support in ALSA.
Change-Id: Iecc128374ff365ef4fb92034d6256c6378bd1f20
Reviewed-on: http://git-master/r/909
Reviewed-by: Gary King <gking@nvidia.com>
Tested-by: Manjula Gupta <magupta@nvidia.com>
Diffstat (limited to 'sound')
| -rw-r--r-- | sound/soc/tegra/tegra_pcm_rpc.c | 35 |
1 files changed, 33 insertions, 2 deletions
diff --git a/sound/soc/tegra/tegra_pcm_rpc.c b/sound/soc/tegra/tegra_pcm_rpc.c index 4dc8d7376980..3e5058da7554 100644 --- a/sound/soc/tegra/tegra_pcm_rpc.c +++ b/sound/soc/tegra/tegra_pcm_rpc.c @@ -26,7 +26,8 @@ static struct tegra_audio_data* tegra_snd_cx = NULL; static const struct snd_pcm_hardware tegra_pcm_hardware = { .info = SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_PAUSE |\ - SNDRV_PCM_INFO_RESUME, + SNDRV_PCM_INFO_RESUME | SNDRV_PCM_INFO_MMAP |\ + SNDRV_PCM_INFO_MMAP_VALID, .rates = TEGRA_SAMPLE_RATES, .formats = TEGRA_SAMPLE_FORMATS, .channels_min = 1, @@ -638,6 +639,35 @@ static int tegra_pcm_close(struct snd_pcm_substream *substream) return 0; } +static int tegra_pcm_mmap(struct snd_pcm_substream *substream, + struct vm_area_struct *vma) +{ + int err = 0; + int size = 0; + char *vmalloc_area_ptr = NULL; + unsigned long start = 0; + unsigned long pfn = 0; + + start = vma->vm_start; + vmalloc_area_ptr = substream->dma_buffer.area; + size = vma->vm_end - vma->vm_start; + vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); + + while (size > 0) { + pfn = vmalloc_to_pfn(vmalloc_area_ptr); + err = io_remap_pfn_range(vma, start, pfn, + PAGE_SIZE, vma->vm_page_prot); + if (err < 0) { + snd_printk(KERN_ERR "io_remap_pfn_range failed \n"); + return err; + } + start += PAGE_SIZE; + vmalloc_area_ptr += PAGE_SIZE; + size -= PAGE_SIZE; + } + return err; +} + static struct snd_pcm_ops tegra_pcm_ops = { .open = tegra_pcm_open, .close = tegra_pcm_close, @@ -647,6 +677,7 @@ static struct snd_pcm_ops tegra_pcm_ops = { .prepare = tegra_pcm_prepare, .trigger = tegra_pcm_trigger, .pointer = tegra_pcm_pointer, + .mmap = tegra_pcm_mmap, }; static int tegra_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream) @@ -666,7 +697,7 @@ static int tegra_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream) e = NvRmMemAlloc(tegra_snd_cx->mem_handle[stream], NULL, 0, - 0x4, + PAGE_SIZE, NvOsMemAttribute_Uncached); } |