// SPDX-License-Identifier: GPL-2.0-only /* * ALSA SoC I2S (McBSP) Audio Layer for TI DAVINCI processor * * Author: Vladimir Barinov, <[email protected]> * Copyright: (C) 2007 MontaVista Software, Inc., <[email protected]> * * DT support (c) 2016 Petr Kulhavy, Barix AG <[email protected]> * based on davinci-mcasp.c DT support * * TODO: * on DA850 implement HW FIFOs instead of DMA into DXR and DRR registers */ #include <linux/init.h> #include <linux/module.h> #include <linux/device.h> #include <linux/slab.h> #include <linux/delay.h> #include <linux/io.h> #include <linux/clk.h> #include <sound/core.h> #include <sound/pcm.h> #include <sound/pcm_params.h> #include <sound/initval.h> #include <sound/soc.h> #include <sound/dmaengine_pcm.h> #include "edma-pcm.h" #include "davinci-i2s.h" #define DRV_NAME … /* * NOTE: terminology here is confusing. * * - This driver supports the "Audio Serial Port" (ASP), * found on dm6446, dm355, and other DaVinci chips. * * - But it labels it a "Multi-channel Buffered Serial Port" * (McBSP) as on older chips like the dm642 ... which was * backward-compatible, possibly explaining that confusion. * * - OMAP chips have a controller called McBSP, which is * incompatible with the DaVinci flavor of McBSP. * * - Newer DaVinci chips have a controller called McASP, * incompatible with ASP and with either McBSP. * * In short: this uses ASP to implement I2S, not McBSP. * And it won't be the only DaVinci implemention of I2S. */ #define DAVINCI_MCBSP_DRR_REG … #define DAVINCI_MCBSP_DXR_REG … #define DAVINCI_MCBSP_SPCR_REG … #define DAVINCI_MCBSP_RCR_REG … #define DAVINCI_MCBSP_XCR_REG … #define DAVINCI_MCBSP_SRGR_REG … #define DAVINCI_MCBSP_PCR_REG … #define DAVINCI_MCBSP_SPCR_RRST … #define DAVINCI_MCBSP_SPCR_RINTM(v) … #define DAVINCI_MCBSP_SPCR_RJUST(v) … #define DAVINCI_MCBSP_SPCR_RJUST_Z_LE … #define DAVINCI_MCBSP_SPCR_RJUST_S_LE … #define DAVINCI_MCBSP_SPCR_XRST … #define DAVINCI_MCBSP_SPCR_XINTM(v) … #define DAVINCI_MCBSP_SPCR_GRST … #define DAVINCI_MCBSP_SPCR_FRST … #define DAVINCI_MCBSP_SPCR_FREE … #define DAVINCI_MCBSP_RCR_RWDLEN1(v) … #define DAVINCI_MCBSP_RCR_RFRLEN1(v) … #define DAVINCI_MCBSP_RCR_RDATDLY(v) … #define DAVINCI_MCBSP_RCR_RFIG … #define DAVINCI_MCBSP_RCR_RWDLEN2(v) … #define DAVINCI_MCBSP_RCR_RFRLEN2(v) … #define DAVINCI_MCBSP_RCR_RPHASE … #define DAVINCI_MCBSP_XCR_XWDLEN1(v) … #define DAVINCI_MCBSP_XCR_XFRLEN1(v) … #define DAVINCI_MCBSP_XCR_XDATDLY(v) … #define DAVINCI_MCBSP_XCR_XFIG … #define DAVINCI_MCBSP_XCR_XWDLEN2(v) … #define DAVINCI_MCBSP_XCR_XFRLEN2(v) … #define DAVINCI_MCBSP_XCR_XPHASE … #define DAVINCI_MCBSP_SRGR_FWID(v) … #define DAVINCI_MCBSP_SRGR_FPER(v) … #define DAVINCI_MCBSP_SRGR_FSGM … #define DAVINCI_MCBSP_SRGR_CLKSM … #define DAVINCI_MCBSP_PCR_CLKRP … #define DAVINCI_MCBSP_PCR_CLKXP … #define DAVINCI_MCBSP_PCR_FSRP … #define DAVINCI_MCBSP_PCR_FSXP … #define DAVINCI_MCBSP_PCR_SCLKME … #define DAVINCI_MCBSP_PCR_CLKRM … #define DAVINCI_MCBSP_PCR_CLKXM … #define DAVINCI_MCBSP_PCR_FSRM … #define DAVINCI_MCBSP_PCR_FSXM … enum { … }; static const unsigned char asp_word_length[SNDRV_PCM_FORMAT_S32_LE + 1] = …; static const unsigned char double_fmt[SNDRV_PCM_FORMAT_S32_LE + 1] = …; struct davinci_mcbsp_dev { … }; static inline void davinci_mcbsp_write_reg(struct davinci_mcbsp_dev *dev, int reg, u32 val) { … } static inline u32 davinci_mcbsp_read_reg(struct davinci_mcbsp_dev *dev, int reg) { … } static void toggle_clock(struct davinci_mcbsp_dev *dev, int playback) { … } static void davinci_mcbsp_start(struct davinci_mcbsp_dev *dev, struct snd_pcm_substream *substream) { … } static void davinci_mcbsp_stop(struct davinci_mcbsp_dev *dev, int playback) { … } static int davinci_i2s_tdm_word_length(int tdm_slot_width) { … } static int davinci_i2s_set_tdm_slot(struct snd_soc_dai *cpu_dai, unsigned int tx_mask, unsigned int rx_mask, int slots, int slot_width) { … } #define DEFAULT_BITPERSAMPLE … static int davinci_i2s_set_dai_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt) { … } static int davinci_i2s_dai_set_clkdiv(struct snd_soc_dai *cpu_dai, int div_id, int div) { … } static int davinci_i2s_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params, struct snd_soc_dai *dai) { … } static int davinci_i2s_prepare(struct snd_pcm_substream *substream, struct snd_soc_dai *dai) { … } static int davinci_i2s_trigger(struct snd_pcm_substream *substream, int cmd, struct snd_soc_dai *dai) { … } static void davinci_i2s_shutdown(struct snd_pcm_substream *substream, struct snd_soc_dai *dai) { … } #define DAVINCI_I2S_RATES … #define DAVINCI_I2S_FORMATS … static int davinci_i2s_dai_probe(struct snd_soc_dai *dai) { … } static const struct snd_soc_dai_ops davinci_i2s_dai_ops = …; static struct snd_soc_dai_driver davinci_i2s_dai = …; static const struct snd_soc_component_driver davinci_i2s_component = …; static int davinci_i2s_probe(struct platform_device *pdev) { … } static void davinci_i2s_remove(struct platform_device *pdev) { … } static const struct of_device_id davinci_i2s_match[] __maybe_unused = …; MODULE_DEVICE_TABLE(of, davinci_i2s_match); static struct platform_driver davinci_mcbsp_driver = …; module_platform_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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