// SPDX-License-Identifier: GPL-2.0-only /* * ALSA SoC I2S Audio Layer for Broadcom BCM2835 SoC * * Author: Florian Meier <[email protected]> * Copyright 2013 * * Based on * Raspberry Pi PCM I2S ALSA Driver * Copyright (c) by Phil Poole 2013 * * ALSA SoC I2S (McBSP) Audio Layer for TI DAVINCI processor * Vladimir Barinov, <[email protected]> * Copyright (C) 2007 MontaVista Software, Inc., <[email protected]> * * OMAP ALSA SoC DAI driver using McBSP port * Copyright (C) 2008 Nokia Corporation * Contact: Jarkko Nikula <[email protected]> * Peter Ujfalusi <[email protected]> * * Freescale SSI ALSA SoC Digital Audio Interface (DAI) driver * Author: Timur Tabi <[email protected]> * Copyright 2007-2010 Freescale Semiconductor, Inc. */ #include <linux/bitops.h> #include <linux/clk.h> #include <linux/delay.h> #include <linux/device.h> #include <linux/init.h> #include <linux/io.h> #include <linux/module.h> #include <linux/of_address.h> #include <linux/slab.h> #include <sound/core.h> #include <sound/dmaengine_pcm.h> #include <sound/initval.h> #include <sound/pcm.h> #include <sound/pcm_params.h> #include <sound/soc.h> /* I2S registers */ #define BCM2835_I2S_CS_A_REG … #define BCM2835_I2S_FIFO_A_REG … #define BCM2835_I2S_MODE_A_REG … #define BCM2835_I2S_RXC_A_REG … #define BCM2835_I2S_TXC_A_REG … #define BCM2835_I2S_DREQ_A_REG … #define BCM2835_I2S_INTEN_A_REG … #define BCM2835_I2S_INTSTC_A_REG … #define BCM2835_I2S_GRAY_REG … /* I2S register settings */ #define BCM2835_I2S_STBY … #define BCM2835_I2S_SYNC … #define BCM2835_I2S_RXSEX … #define BCM2835_I2S_RXF … #define BCM2835_I2S_TXE … #define BCM2835_I2S_RXD … #define BCM2835_I2S_TXD … #define BCM2835_I2S_RXR … #define BCM2835_I2S_TXW … #define BCM2835_I2S_CS_RXERR … #define BCM2835_I2S_CS_TXERR … #define BCM2835_I2S_RXSYNC … #define BCM2835_I2S_TXSYNC … #define BCM2835_I2S_DMAEN … #define BCM2835_I2S_RXTHR(v) … #define BCM2835_I2S_TXTHR(v) … #define BCM2835_I2S_RXCLR … #define BCM2835_I2S_TXCLR … #define BCM2835_I2S_TXON … #define BCM2835_I2S_RXON … #define BCM2835_I2S_EN … #define BCM2835_I2S_CLKDIS … #define BCM2835_I2S_PDMN … #define BCM2835_I2S_PDME … #define BCM2835_I2S_FRXP … #define BCM2835_I2S_FTXP … #define BCM2835_I2S_CLKM … #define BCM2835_I2S_CLKI … #define BCM2835_I2S_FSM … #define BCM2835_I2S_FSI … #define BCM2835_I2S_FLEN(v) … #define BCM2835_I2S_FSLEN(v) … #define BCM2835_I2S_CHWEX … #define BCM2835_I2S_CHEN … #define BCM2835_I2S_CHPOS(v) … #define BCM2835_I2S_CHWID(v) … #define BCM2835_I2S_CH1(v) … #define BCM2835_I2S_CH2(v) … #define BCM2835_I2S_CH1_POS(v) … #define BCM2835_I2S_CH2_POS(v) … #define BCM2835_I2S_TX_PANIC(v) … #define BCM2835_I2S_RX_PANIC(v) … #define BCM2835_I2S_TX(v) … #define BCM2835_I2S_RX(v) … #define BCM2835_I2S_INT_RXERR … #define BCM2835_I2S_INT_TXERR … #define BCM2835_I2S_INT_RXR … #define BCM2835_I2S_INT_TXW … /* Frame length register is 10 bit, maximum length 1024 */ #define BCM2835_I2S_MAX_FRAME_LENGTH … /* General device struct */ struct bcm2835_i2s_dev { … }; static void bcm2835_i2s_start_clock(struct bcm2835_i2s_dev *dev) { … } static void bcm2835_i2s_stop_clock(struct bcm2835_i2s_dev *dev) { … } static void bcm2835_i2s_clear_fifos(struct bcm2835_i2s_dev *dev, bool tx, bool rx) { … } static int bcm2835_i2s_set_dai_fmt(struct snd_soc_dai *dai, unsigned int fmt) { … } static int bcm2835_i2s_set_dai_bclk_ratio(struct snd_soc_dai *dai, unsigned int ratio) { … } static int bcm2835_i2s_set_dai_tdm_slot(struct snd_soc_dai *dai, unsigned int tx_mask, unsigned int rx_mask, int slots, int width) { … } /* * Convert logical slot number into physical slot number. * * If odd_offset is 0 sequential number is identical to logical number. * This is used for DSP modes with slot numbering 0 1 2 3 ... * * Otherwise odd_offset defines the physical offset for odd numbered * slots. This is used for I2S and left/right justified modes to * translate from logical slot numbers 0 1 2 3 ... into physical slot * numbers 0 2 ... 3 4 ... */ static int bcm2835_i2s_convert_slot(unsigned int slot, unsigned int odd_offset) { … } /* * Calculate channel position from mask and slot width. * * Mask must contain exactly 2 set bits. * Lowest set bit is channel 1 position, highest set bit channel 2. * The constant offset is added to both channel positions. * * If odd_offset is > 0 slot positions are translated to * I2S-style TDM slot numbering ( 0 2 ... 3 4 ...) with odd * logical slot numbers starting at physical slot odd_offset. */ static void bcm2835_i2s_calc_channel_pos( unsigned int *ch1_pos, unsigned int *ch2_pos, unsigned int mask, unsigned int width, unsigned int bit_offset, unsigned int odd_offset) { … } static int bcm2835_i2s_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params, struct snd_soc_dai *dai) { … } static int bcm2835_i2s_prepare(struct snd_pcm_substream *substream, struct snd_soc_dai *dai) { … } static void bcm2835_i2s_stop(struct bcm2835_i2s_dev *dev, struct snd_pcm_substream *substream, struct snd_soc_dai *dai) { … } static int bcm2835_i2s_trigger(struct snd_pcm_substream *substream, int cmd, struct snd_soc_dai *dai) { … } static int bcm2835_i2s_startup(struct snd_pcm_substream *substream, struct snd_soc_dai *dai) { … } static void bcm2835_i2s_shutdown(struct snd_pcm_substream *substream, struct snd_soc_dai *dai) { … } static int bcm2835_i2s_dai_probe(struct snd_soc_dai *dai) { … } static const struct snd_soc_dai_ops bcm2835_i2s_dai_ops = …; static struct snd_soc_dai_driver bcm2835_i2s_dai = …; static bool bcm2835_i2s_volatile_reg(struct device *dev, unsigned int reg) { … } static bool bcm2835_i2s_precious_reg(struct device *dev, unsigned int reg) { … } static const struct regmap_config bcm2835_regmap_config = …; static const struct snd_soc_component_driver bcm2835_i2s_component = …; static int bcm2835_i2s_probe(struct platform_device *pdev) { … } static const struct of_device_id bcm2835_i2s_of_match[] = …; MODULE_DEVICE_TABLE(of, bcm2835_i2s_of_match); static struct platform_driver bcm2835_i2s_driver = …; module_platform_driver(…) …; MODULE_ALIAS(…) …; MODULE_DESCRIPTION(…) …; MODULE_AUTHOR(…) …; MODULE_LICENSE(…) …;
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