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2952b27e2e
Davinci McASP has support for I2S multichannel playback. For I2S playback/receive, each serializer is capable to play 2 channels (L/R) audio data.Serializer function (Playback-receive-none) is configured in DT, depending on hardware specification. It is possible to play less channels than configured in DT. For that purpose,only specific number of active serializers are enabled. McASP FIFO need to have DMA transfer Bcnt set to number of enabled serializers, otherwise no data are transfered to McASP and Alsa generates "DMA/IRQ playback write error (DMA or IRQ trouble?)" error. For TDM mode, McASP is capable to play or receive 32 channels for one serializer. McAsp has support for max 16 serializer, therefore max channels is 32 * 8. Signed-off-by: Michal Bachraty <michal.bachraty@streamunlimited.com> Tested-by: Daniel Mack <zonque@gmail.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
37 lines
1.2 KiB
C
37 lines
1.2 KiB
C
/*
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* ALSA PCM interface for the TI DAVINCI processor
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*
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* Author: Vladimir Barinov, <vbarinov@embeddedalley.com>
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* Copyright: (C) 2007 MontaVista Software, Inc., <source@mvista.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef _DAVINCI_PCM_H
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#define _DAVINCI_PCM_H
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#include <linux/genalloc.h>
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#include <linux/platform_data/davinci_asp.h>
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#include <mach/edma.h>
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struct davinci_pcm_dma_params {
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int channel; /* sync dma channel ID */
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unsigned short acnt;
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dma_addr_t dma_addr; /* device physical address for DMA */
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unsigned sram_size;
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struct gen_pool *sram_pool; /* SRAM gen_pool for ping pong */
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enum dma_event_q asp_chan_q; /* event queue number for ASP channel */
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enum dma_event_q ram_chan_q; /* event queue number for RAM channel */
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unsigned char data_type; /* xfer data type */
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unsigned char convert_mono_stereo;
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unsigned int fifo_level;
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unsigned char active_serializers; /* num. of active audio serializers */
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};
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int davinci_soc_platform_register(struct device *dev);
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void davinci_soc_platform_unregister(struct device *dev);
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#endif
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