// SPDX-License-Identifier: GPL-2.0-only /* * linux/sound/soc/ep93xx-i2s.c * EP93xx I2S driver * * Copyright (C) 2010 Ryan Mallon * * Based on the original driver by: * Copyright (C) 2007 Chase Douglas <chasedouglas@gmail> * Copyright (C) 2006 Lennert Buytenhek <[email protected]> */ #include <linux/module.h> #include <linux/init.h> #include <linux/slab.h> #include <linux/clk.h> #include <linux/io.h> #include <linux/of.h> #include <sound/core.h> #include <sound/dmaengine_pcm.h> #include <sound/pcm.h> #include <sound/pcm_params.h> #include <sound/initval.h> #include <sound/soc.h> #include <linux/platform_data/dma-ep93xx.h> #include <linux/soc/cirrus/ep93xx.h> #include "ep93xx-pcm.h" #define EP93XX_I2S_TXCLKCFG … #define EP93XX_I2S_RXCLKCFG … #define EP93XX_I2S_GLSTS … #define EP93XX_I2S_GLCTRL … #define EP93XX_I2S_I2STX0LFT … #define EP93XX_I2S_I2STX0RT … #define EP93XX_I2S_TXLINCTRLDATA … #define EP93XX_I2S_TXCTRL … #define EP93XX_I2S_TXWRDLEN … #define EP93XX_I2S_TX0EN … #define EP93XX_I2S_RXLINCTRLDATA … #define EP93XX_I2S_RXCTRL … #define EP93XX_I2S_RXWRDLEN … #define EP93XX_I2S_RX0EN … #define EP93XX_I2S_WRDLEN_16 … #define EP93XX_I2S_WRDLEN_24 … #define EP93XX_I2S_WRDLEN_32 … #define EP93XX_I2S_RXLINCTRLDATA_R_JUST … #define EP93XX_I2S_TXLINCTRLDATA_R_JUST … /* * Transmit empty interrupt level select: * 0 - Generate interrupt when FIFO is half empty * 1 - Generate interrupt when FIFO is empty */ #define EP93XX_I2S_TXCTRL_TXEMPTY_LVL … #define EP93XX_I2S_TXCTRL_TXUFIE … #define EP93XX_I2S_CLKCFG_LRS … #define EP93XX_I2S_CLKCFG_CKP … #define EP93XX_I2S_CLKCFG_REL … #define EP93XX_I2S_CLKCFG_MASTER … #define EP93XX_I2S_CLKCFG_NBCG … #define EP93XX_I2S_GLSTS_TX0_FIFO_FULL … struct ep93xx_i2s_info { … }; static struct ep93xx_dma_data ep93xx_i2s_dma_data[] = …; static inline void ep93xx_i2s_write_reg(struct ep93xx_i2s_info *info, unsigned reg, unsigned val) { … } static inline unsigned ep93xx_i2s_read_reg(struct ep93xx_i2s_info *info, unsigned reg) { … } static void ep93xx_i2s_enable(struct ep93xx_i2s_info *info, int stream) { … } static void ep93xx_i2s_disable(struct ep93xx_i2s_info *info, int stream) { … } /* * According to documentation I2S controller can handle underflow conditions * just fine, but in reality the state machine is sometimes confused so that * the whole stream is shifted by one byte. The watchdog below disables the TX * FIFO, fills the buffer with zeroes and re-enables the FIFO. State machine * is being reset and by filling the buffer we get some time before next * underflow happens. */ static irqreturn_t ep93xx_i2s_interrupt(int irq, void *dev_id) { … } static int ep93xx_i2s_dai_probe(struct snd_soc_dai *dai) { … } static int ep93xx_i2s_startup(struct snd_pcm_substream *substream, struct snd_soc_dai *dai) { … } static void ep93xx_i2s_shutdown(struct snd_pcm_substream *substream, struct snd_soc_dai *dai) { … } static int ep93xx_i2s_set_dai_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt) { … } static int ep93xx_i2s_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params, struct snd_soc_dai *dai) { … } static int ep93xx_i2s_set_sysclk(struct snd_soc_dai *cpu_dai, int clk_id, unsigned int freq, int dir) { … } #ifdef CONFIG_PM static int ep93xx_i2s_suspend(struct snd_soc_component *component) { … } static int ep93xx_i2s_resume(struct snd_soc_component *component) { … } #else #define ep93xx_i2s_suspend … #define ep93xx_i2s_resume … #endif static const struct snd_soc_dai_ops ep93xx_i2s_dai_ops = …; #define EP93XX_I2S_FORMATS … static struct snd_soc_dai_driver ep93xx_i2s_dai = …; static const struct snd_soc_component_driver ep93xx_i2s_component = …; static int ep93xx_i2s_probe(struct platform_device *pdev) { … } static void ep93xx_i2s_remove(struct platform_device *pdev) { … } static const struct of_device_id ep93xx_i2s_of_ids[] = …; MODULE_DEVICE_TABLE(of, ep93xx_i2s_of_ids); static struct platform_driver ep93xx_i2s_driver = …; module_platform_driver(…) …; MODULE_ALIAS(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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