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The bf5xx-i2s{,-pcm} and bf5xx-tdm{-pcm} drivers are nearly identical. Both are
for the same hardware each supporting a slight different subset of the hardware.
The bf5xx-i2s driver supports 2 channel I2S mode while the bf5xx-tdm driver
supports TDM mode and channel remapping. This patch adds support for TDM mode
and channel remapping to the bf5xx-i2s driver so that we'll eventually be able
to retire the bf5xx-tdm driver. Unfortunately the hardware is fixed to using 8
channels in TDM mode. The bf5xx-tdm driver jumps through a few hoops to make it
work well with other channel counts as well:
* Don't support mmap
* Translate between internal frame size (which is always 8 * sample_size)
and ALSA frame size (which depends on the channel count)
* Have special copy and silence callbacks which are aware of the mismatch
between internal and ALSA frame size
* Reduce the maximum buffer size to ensure that there is enough headroom for
dummy data.
The bf5xx-i2s driver is going to use the same mechanisms when being used int
TDM mode.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
18 lines
378 B
C
18 lines
378 B
C
/*
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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 _BF5XX_TDM_PCM_H
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#define _BF5XX_TDM_PCM_H
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#define BFIN_TDM_DAI_MAX_SLOTS 8
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struct bf5xx_i2s_pcm_data {
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unsigned int map[BFIN_TDM_DAI_MAX_SLOTS];
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bool tdm_mode;
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};
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#endif
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