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Diffstat (limited to 'Documentation/sound/alsa/soc/DAI.txt')
| -rw-r--r-- | Documentation/sound/alsa/soc/DAI.txt | 490 |
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diff --git a/Documentation/sound/alsa/soc/DAI.txt b/Documentation/sound/alsa/soc/DAI.txt index 251545a..58cbfd0 100644 --- a/Documentation/sound/alsa/soc/DAI.txt +++ b/Documentation/sound/alsa/soc/DAI.txt @@ -54,493 +54,3 @@ Common PCM operating modes:- o Mode A - MSB is transmitted on falling edge of first BCLK after FRAME/SYNC. o Mode B - MSB is transmitted on rising edge of FRAME/SYNC. - - -ASoC DAI Configuration -====================== - -Every CODEC DAI and SoC DAI must have their capabilities defined in order to -be configured together at runtime when the audio and clocking parameters are -known. This is achieved by creating an array of struct snd_soc_hw_mode in the -the CODEC and SoC interface drivers. Each element in the array describes a DAI -mode and each mode is usually based upon the DAI system clock to sample rate -ratio (FS). - -i.e. 48k sample rate @ 256 FS = sytem clock of 12.288 MHz - 48000 * 256 = 12288000 - -The CPU and Codec DAI modes are then ANDed together at runtime to determine the -rutime DAI configuration for both the Codec and CPU. - -When creating a new codec or SoC DAI it's probably best to start of with a few -sample rates first and then test your interface. - -struct snd_soc_dai_mode is defined (in soc.h) as:- - -/* SoC DAI mode */ -struct snd_soc_dai_mode { - u16 fmt; /* SND_SOC_DAIFMT_* */ - u16 tdm; /* SND_SOC_HWTDM_* */ - u64 pcmfmt; /* SNDRV_PCM_FMTBIT_* */ - u16 pcmrate; /* SND_SOC_HWRATE_* */ - u16 pcmdir:2; /* SND_SOC_HWDIR_* */ - u16 flags:8; /* hw flags */ - u16 fs; /* mclk to rate divider */ - u64 bfs; /* mclk to bclk dividers */ - unsigned long priv; /* private mode data */ -}; - -fmt: ----- -This field defines the DAI mode hardware format (e.g. I2S settings) and -supports the following settings:- - - 1) hardware DAI formats - -#define SND_SOC_DAIFMT_I2S (1 << 0) /* I2S mode */ -#define SND_SOC_DAIFMT_RIGHT_J (1 << 1) /* Right justified mode */ -#define SND_SOC_DAIFMT_LEFT_J (1 << 2) /* Left Justified mode */ -#define SND_SOC_DAIFMT_DSP_A (1 << 3) /* L data msb after FRM */ -#define SND_SOC_DAIFMT_DSP_B (1 << 4) /* L data msb during FRM */ -#define SND_SOC_DAIFMT_AC97 (1 << 5) /* AC97 */ - - 2) hw DAI signal inversions - -#define SND_SOC_DAIFMT_NB_NF (1 << 8) /* normal bit clock + frame */ -#define SND_SOC_DAIFMT_NB_IF (1 << 9) /* normal bclk + inv frm */ -#define SND_SOC_DAIFMT_IB_NF (1 << 10) /* invert bclk + nor frm */ -#define SND_SOC_DAIFMT_IB_IF (1 << 11) /* invert bclk + frm */ - - 3) hw clock masters - This is wrt the codec, the inverse is true for the interface - i.e. if the codec is clk and frm master then the interface is - clk and frame slave. - -#define SND_SOC_DAIFMT_CBM_CFM (1 << 12) /* codec clk & frm master */ -#define SND_SOC_DAIFMT_CBS_CFM (1 << 13) /* codec clk slave & frm master */ -#define SND_SOC_DAIFMT_CBM_CFS (1 << 14) /* codec clk master & frame slave */ -#define SND_SOC_DAIFMT_CBS_CFS (1 << 15) /* codec clk & frm slave */ - -At least one option from each section must be selected. Multiple selections are -also supported e.g. - - .fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_LEFT_J | SND_SOC_DAIFMT_RIGHT_J | \ - SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_NB_IF | SND_SOC_DAIFMT_IB_NF | \ - SND_SOC_DAIFMT_IB_IF - - -tdm: ------- -This field defines the Time Division Multiplexing left and right word -positions for the DAI mode if applicable. Set to SND_SOC_DAITDM_LRDW(0,0) for -no TDM. - - -pcmfmt: ---------- -The hardware PCM format. This describes the PCM formats supported by the DAI -mode e.g. - - .pcmfmt = SNDRV_PCM_FORMAT_S16_LE | SNDRV_PCM_FORMAT_S20_3LE | \ - SNDRV_PCM_FORMAT_S24_3LE - -pcmrate: ----------- -The PCM sample rates supported by the DAI mode. e.g. - - .pcmrate = SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \ - SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \ - SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000 - - -pcmdir: ---------- -The stream directions supported by this mode. e.g. playback and capture - - -flags: --------- -The DAI hardware flags supported by the mode. - -/* use bfs mclk divider mode (BCLK = MCLK / x) */ -#define SND_SOC_DAI_BFS_DIV 0x1 -/* use bfs rate mulitplier (BCLK = RATE * x)*/ -#define SND_SOC_DAI_BFS_RATE 0x2 -/* use bfs rcw multiplier (BCLK = RATE * CHN * WORD SIZE) */ -#define SND_SOC_DAI_BFS_RCW 0x4 -/* capture and playback can use different clocks */ -#define SND_SOC_DAI_ASYNC 0x8 - -NOTE: Bitclock division and mulitiplication modes can be safely matched by the -core logic. - - -fs: ------ -The FS supported by this DAI mode FS is the ratio between the system clock and -the sample rate. See above - -bfs: ------- -BFS is the ratio of BCLK to MCLK or the ratio of BCLK to sample rate (this -depends on the codec or CPU DAI). - -The BFS supported by the DAI mode. This can either be the ratio between the -bitclock (BCLK) and the sample rate OR the ratio between the system clock and -the sample rate. Depends on the flags above. - -priv: ------ -private codec mode data. - - - -Examples -======== - -Note that Codec DAI and CPU DAI examples are interchangeable in these examples -as long as the bus master is reversed. i.e. - - SND_SOC_DAIFMT_CBM_CFM would become SND_SOC_DAIFMT_CBS_CFS - and vice versa. - -This applies to all SND_SOC_DAIFMT_CB*_CF*. - -Example 1 ---------- - -Simple codec that only runs at 8k & 48k @ 256FS in master mode, can generate a -BCLK of either MCLK/2 or MCLK/4. - - /* codec master */ - { - .fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBM_CFM, - .pcmfmt = SNDRV_PCM_FORMAT_S16_LE, - .pcmrate = SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_48000, - .pcmdir = SND_SOC_DAIDIR_PLAYBACK | SND_SOC_DAIDIR_CAPTURE, - .flags = SND_SOC_DAI_BFS_DIV, - .fs = 256, - .bfs = SND_SOC_FSBD(2) | SND_SOC_FSBD(4), - } - - -Example 2 ---------- -Simple codec that only runs at 8k & 48k @ 256FS in master mode, can generate a -BCLK of either Rate * 32 or Rate * 64. - - /* codec master */ - { - .fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBM_CFM, - .pcmfmt = SNDRV_PCM_FORMAT_S16_LE, - .pcmrate = SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_48000, - .pcmdir = SND_SOC_DAIDIR_PLAYBACK | SND_SOC_DAIDIR_CAPTURE, - .flags = SND_SOC_DAI_BFS_RATE, - .fs = 256, - .bfs = 32, - }, - { - .fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBM_CFM, - .pcmfmt = SNDRV_PCM_FORMAT_S16_LE, - .pcmrate = SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_48000, - .pcmdir = SND_SOC_DAIDIR_PLAYBACK | SND_SOC_DAIDIR_CAPTURE, - .flags = SND_SOC_DAI_BFS_RATE, - .fs = 256, - .bfs = 64, - }, - - -Example 3 ---------- -Codec that runs at 8k & 48k @ 256FS in master mode, can generate a BCLK that -is a multiple of Rate * channels * word size. (RCW) i.e. - - BCLK = 8000 * 2 * 16 (8k, stereo, 16bit) - = 256kHz - -This codecs supports a RCW multiple of 1,2 - - { - .fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBM_CFM, - .pcmfmt = SNDRV_PCM_FORMAT_S16_LE, - .pcmrate = SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_48000, - .pcmdir = SND_SOC_DAIDIR_PLAYBACK | SND_SOC_DAIDIR_CAPTURE, - .flags = SND_SOC_DAI_BFS_RCW, - .fs = 256, - .bfs = SND_SOC_FSBW(1) | SND_SOC_FSBW(2), - } - - -Example 4 ---------- -Codec that only runs at 8k & 48k @ 256FS in master mode, can generate a -BCLK of either Rate * 32 or Rate * 64. Codec can also run in slave mode as long -as BCLK is rate * 32 or rate * 64. - - /* codec master */ - { - .fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBM_CFM, - .pcmfmt = SNDRV_PCM_FORMAT_S16_LE, - .pcmrate = SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_48000, - .pcmdir = SND_SOC_DAIDIR_PLAYBACK | SND_SOC_DAIDIR_CAPTURE, - .flags = SND_SOC_DAI_BFS_RATE, - .fs = 256, - .bfs = 32, - }, - { - .fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBM_CFM, - .pcmfmt = SNDRV_PCM_FORMAT_S16_LE, - .pcmrate = SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_48000, - .pcmdir = SND_SOC_DAIDIR_PLAYBACK | SND_SOC_DAIDIR_CAPTURE, - .flags = SND_SOC_DAI_BFS_RATE, - .fs = 256, - .bfs = 64, - }, - - /* codec slave */ - { - .fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBS_CFS, - .pcmfmt = SNDRV_PCM_FORMAT_S16_LE, - .pcmdir = SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_48000, - .pcmdir = SND_SOC_DAIDIR_PLAYBACK | SND_SOC_DAIDIR_CAPTURE, - .flags = SND_SOC_DAI_BFS_RATE, - .fs = SND_SOC_FS_ALL, - .bfs = 32, - }, - { - .fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBS_CFS, - .pcmfmt = SNDRV_PCM_FORMAT_S16_LE, - .pcmdir = SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_48000, - .pcmdir = SND_SOC_DAIDIR_PLAYBACK | SND_SOC_DAIDIR_CAPTURE, - .flags = SND_SOC_DAI_BFS_RATE, - .fs = SND_SOC_FS_ALL, - .bfs = 64, - }, - - -Example 5 ---------- -Codec that only runs at 8k, 16k, 32k, 48k, 96k @ 128FS, 192FS & 256FS in master -mode and can generate a BCLK of MCLK / (1,2,4,8,16). Codec can also run in slave -mode as and does not care about FS or BCLK (as long as there is enough bandwidth). - - #define CODEC_FSB \ - (SND_SOC_FSBD(1) | SND_SOC_FSBD(2) | SND_SOC_FSBD(4) | \ - SND_SOC_FSBD(8) | SND_SOC_FSBD(16)) - - #define CODEC_RATES \ - (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_32000 |\ - SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000) - - /* codec master @ 128, 192 & 256 FS */ - { - .fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBM_CFM, - .pcmfmt = SNDRV_PCM_FORMAT_S16_LE, - .pcmrate = CODEC_RATES, - .pcmdir = SND_SOC_DAIDIR_PLAYBACK | SND_SOC_DAIDIR_CAPTURE, - .flags = SND_SOC_DAI_BFS_DIV, - .fs = 128, - .bfs = CODEC_FSB, - }, - - { - .fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBM_CFM, - .pcmfmt = SNDRV_PCM_FORMAT_S16_LE, - .pcmrate = CODEC_RATES, - .pcmdir = SND_SOC_DAIDIR_PLAYBACK | SND_SOC_DAIDIR_CAPTURE, - .flags = SND_SOC_DAI_BFS_DIV, - .fs = 192, - .bfs = CODEC_FSB - }, - - { - .fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBM_CFM, - .pcmfmt = SNDRV_PCM_FORMAT_S16_LE, - .pcmrate = CODEC_RATES, - .pcmdir = SND_SOC_DAIDIR_PLAYBACK | SND_SOC_DAIDIR_CAPTURE, - .flags = SND_SOC_DAI_BFS_DIV, - .fs = 256, - .bfs = CODEC_FSB, - }, - - /* codec slave */ - { - .fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBS_CFS, - .pcmfmt = SNDRV_PCM_FORMAT_S16_LE, - .pcmrate = CODEC_RATES, - .pcmdir = SND_SOC_DAIDIR_PLAYBACK | SND_SOC_DAIDIR_CAPTURE, - .fs = SND_SOC_FS_ALL, - .bfs = SND_SOC_FSB_ALL, - }, - - -Example 6 ---------- -Codec that only runs at 8k, 44.1k, 48k @ different FS in master mode (for use -with a fixed MCLK) and can generate a BCLK of MCLK / (1,2,4,8,16). -Codec can also run in slave mode as and does not care about FS or BCLK (as long -as there is enough bandwidth). Codec can support 16, 24 and 32 bit PCM sample -sizes. - - #define CODEC_FSB \ - (SND_SOC_FSBD(1) | SND_SOC_FSBD(2) | SND_SOC_FSBD(4) | \ - SND_SOC_FSBD(8) | SND_SOC_FSBD(16)) - - #define CODEC_PCM_FORMATS \ - (SNDRV_PCM_FORMAT_S16_LE | SNDRV_PCM_FORMAT_S20_3LE | \ - SNDRV_PCM_FORMAT_S24_3LE | SNDRV_PCM_FORMAT_S24_LE | SNDRV_PCM_FORMAT_S32_LE) - - /* codec master */ - { - .fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBM_CFM, - .pcmfmt = SNDRV_PCM_FORMAT_S16_LE, - .pcmrate = SNDRV_PCM_RATE_8000, - .pcmdir = SND_SOC_DAIDIR_PLAYBACK | SND_SOC_DAIDIR_CAPTURE, - .flags = SND_SOC_DAI_BFS_DIV, - .fs = 1536, - .bfs = CODEC_FSB, - }, - - { - .fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBM_CFM, - .pcmfmt = SNDRV_PCM_FORMAT_S16_LE, - .pcmrate = SNDRV_PCM_RATE_44100, - .pcmdir = SND_SOC_DAIDIR_PLAYBACK | SND_SOC_DAIDIR_CAPTURE, - .flags = SND_SOC_DAI_BFS_DIV, - .fs = 272, - .bfs = CODEC_FSB, - }, - - { - .fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBM_CFM, - .pcmfmt = SNDRV_PCM_FORMAT_S16_LE, - .pcmrate = SNDRV_PCM_RATE_48000, - .pcmdir = SND_SOC_DAIDIR_PLAYBACK | SND_SOC_DAIDIR_CAPTURE, - .flags = SND_SOC_DAI_BFS_DIV, - .fs = 256, - .bfs = CODEC_FSB, - }, - - /* codec slave */ - { - .fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBS_CFS, - .pcmfmt = SNDRV_PCM_FORMAT_S16_LE, - .pcmrate = CODEC_RATES, - .pcmdir = SND_SOC_DAIDIR_PLAYBACK | SND_SOC_DAIDIR_CAPTURE, - .fs = SND_SOC_FS_ALL, - .bfs = SND_SOC_FSB_ALL, - }, - - -Example 7 ---------- -AC97 Codec that does not support VRA (i.e only runs at 48k). - - #define AC97_DIR \ - (SND_SOC_DAIDIR_PLAYBACK | SND_SOC_DAIDIR_CAPTURE) - - #define AC97_PCM_FORMATS \ - (SNDRV_PCM_FORMAT_S16_LE | SNDRV_PCM_FORMAT_S18_3LE | \ - SNDRV_PCM_FORMAT_S20_3LE) - - /* AC97 with no VRA */ - { - .pcmfmt = AC97_PCM_FORMATS, - .pcmrate = SNDRV_PCM_RATE_48000, - } - - -Example 8 ---------- - -CPU DAI that supports 8k - 48k @ 256FS and BCLK = MCLK / 4 in master mode. -Slave mode (CPU DAI is FRAME master) supports 8k - 96k at any FS as long as -BCLK = 64 * rate. (Intel XScale I2S controller). - - #define PXA_I2S_DAIFMT \ - (SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_LEFT_J | SND_SOC_DAIFMT_NB_NF) - - #define PXA_I2S_DIR \ - (SND_SOC_DAIDIR_PLAYBACK | SND_SOC_DAIDIR_CAPTURE) - - #define PXA_I2S_RATES \ - (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \ - SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \ - SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000) - - /* priv is divider */ - static struct snd_soc_dai_mode pxa2xx_i2s_modes[] = { - /* pxa2xx I2S frame and clock master modes */ - { - .fmt = PXA_I2S_DAIFMT | SND_SOC_DAIFMT_CBS_CFS, - .pcmfmt = SNDRV_PCM_FMTBIT_S16_LE, - .pcmrate = SNDRV_PCM_RATE_8000, - .pcmdir = PXA_I2S_DIR, - .flags = SND_SOC_DAI_BFS_DIV, - .fs = 256, - .bfs = SND_SOC_FSBD(4), - .priv = 0x48, - }, - { - .fmt = PXA_I2S_DAIFMT | SND_SOC_DAIFMT_CBS_CFS, - .pcmfmt = SNDRV_PCM_FMTBIT_S16_LE, - .pcmrate = SNDRV_PCM_RATE_11025, - .pcmdir = PXA_I2S_DIR, - .flags = SND_SOC_DAI_BFS_DIV, - .fs = 256, - .bfs = SND_SOC_FSBD(4), - .priv = 0x34, - }, - { - .fmt = PXA_I2S_DAIFMT | SND_SOC_DAIFMT_CBS_CFS, - .pcmfmt = SNDRV_PCM_FMTBIT_S16_LE, - .pcmrate = SNDRV_PCM_RATE_16000, - .pcmdir = PXA_I2S_DIR, - .flags = SND_SOC_DAI_BFS_DIV, - .fs = 256, - .bfs = SND_SOC_FSBD(4), - .priv = 0x24, - }, - { - .fmt = PXA_I2S_DAIFMT | SND_SOC_DAIFMT_CBS_CFS, - .pcmfmt = SNDRV_PCM_FMTBIT_S16_LE, - .pcmrate = SNDRV_PCM_RATE_22050, - .pcmdir = PXA_I2S_DIR, - .flags = SND_SOC_DAI_BFS_DIV, - .fs = 256, - .bfs = SND_SOC_FSBD(4), - .priv = 0x1a, - }, - { - .fmt = PXA_I2S_DAIFMT | SND_SOC_DAIFMT_CBS_CFS, - .pcmfmt = SNDRV_PCM_FMTBIT_S16_LE, - .pcmrate = SNDRV_PCM_RATE_44100, - .pcmdir = PXA_I2S_DIR, - .flags = SND_SOC_DAI_BFS_DIV, - .fs = 256, - .bfs = SND_SOC_FSBD(4), - .priv = 0xd, - }, - { - .fmt = PXA_I2S_DAIFMT | SND_SOC_DAIFMT_CBS_CFS, - .pcmfmt = SNDRV_PCM_FMTBIT_S16_LE, - .pcmrate = SNDRV_PCM_RATE_48000, - .pcmdir = PXA_I2S_DIR, - .flags = SND_SOC_DAI_BFS_DIV, - .fs = 256, - .bfs = SND_SOC_FSBD(4), - .priv = 0xc, - }, - - /* pxa2xx I2S frame master and clock slave mode */ - { - .fmt = PXA_I2S_DAIFMT | SND_SOC_DAIFMT_CBM_CFS, - .pcmfmt = SNDRV_PCM_FMTBIT_S16_LE, - .pcmrate = PXA_I2S_RATES, - .pcmdir = PXA_I2S_DIR, - .fs = SND_SOC_FS_ALL, - .flags = SND_SOC_DAI_BFS_RATE, - .bfs = 64, - .priv = 0x48, - }, -}; |