At Thu, 24 Jun 2010 12:52:47 +0530, Adish Kuvelker wrote: > > Hello, > > If I use "SNDRV_DMA_TYPE_CONTINUOUS" as a parameter to pre-allocate > function to get contiguous locations of memory and use the function > snd_dma_continuous_data() would that be correct setting for my case? I guess no. As mentioned, it's no DMA memory, i.e. simple pages allocated via __get_free_pages() and co. > Where are the parameters of dma_addr and dma_area written to the > runtime structure? These are available only for pages properly allocated for DMA. Takashi > > Regards; > Aadish > > On Thu, Jun 24, 2010 at 12:45 PM, Takashi Iwai <tiwai@xxxxxxx> wrote: > > At Thu, 24 Jun 2010 12:38:35 +0530, > > Adish Kuvelker wrote: > >> > >> Hello Takashi, > >> > >> I am developing a DMA Controller driver to service the PCM out data to > >> the Audio controller on the arm-based ATLASIII procesor. In case you > >> need any more information on the architecture I can pass. > >> > >> Since the DMA isn't on PCI bus I am pre-allocation continuous memero > >> using the "snd_pcm_lib_preallocate_pages_for_all" passing > >> SNDDRV_DMA_TYPE_DEV and "snd_dma_continuous_data" as appropriate > >> parameters. > > > > snd_dma_continuous_data() is only for SNDRV_DMA_TYPE_CONTINUOUS. > > In this case, the pages aren't for DMA. > > > > For SNDRV_DMA_TYPE_DEV, simply pass the device pointer you use. > > > > > > Takashi > > > _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
