// SPDX-License-Identifier: GPL-2.0-only /* * Xtfpga I2S controller driver * * Copyright (c) 2014 Cadence Design Systems Inc. */ #include <linux/clk.h> #include <linux/io.h> #include <linux/module.h> #include <linux/of.h> #include <linux/platform_device.h> #include <linux/pm_runtime.h> #include <sound/pcm_params.h> #include <sound/soc.h> #define DRV_NAME … #define XTFPGA_I2S_VERSION … #define XTFPGA_I2S_CONFIG … #define XTFPGA_I2S_INT_MASK … #define XTFPGA_I2S_INT_STATUS … #define XTFPGA_I2S_CHAN0_DATA … #define XTFPGA_I2S_CHAN1_DATA … #define XTFPGA_I2S_CHAN2_DATA … #define XTFPGA_I2S_CHAN3_DATA … #define XTFPGA_I2S_CONFIG_TX_ENABLE … #define XTFPGA_I2S_CONFIG_INT_ENABLE … #define XTFPGA_I2S_CONFIG_LEFT … #define XTFPGA_I2S_CONFIG_RATIO_BASE … #define XTFPGA_I2S_CONFIG_RATIO_MASK … #define XTFPGA_I2S_CONFIG_RES_BASE … #define XTFPGA_I2S_CONFIG_RES_MASK … #define XTFPGA_I2S_CONFIG_LEVEL_BASE … #define XTFPGA_I2S_CONFIG_LEVEL_MASK … #define XTFPGA_I2S_CONFIG_CHANNEL_BASE … #define XTFPGA_I2S_INT_UNDERRUN … #define XTFPGA_I2S_INT_LEVEL … #define XTFPGA_I2S_INT_VALID … #define XTFPGA_I2S_FIFO_SIZE … /* * I2S controller operation: * * Enabling TX: output 1 period of zeros (starting with left channel) * and then queued data. * * Level status and interrupt: whenever FIFO level is below FIFO trigger, * level status is 1 and an IRQ is asserted (if enabled). * * Underrun status and interrupt: whenever FIFO is empty, underrun status * is 1 and an IRQ is asserted (if enabled). */ struct xtfpga_i2s { … }; static bool xtfpga_i2s_wr_reg(struct device *dev, unsigned int reg) { … } static bool xtfpga_i2s_rd_reg(struct device *dev, unsigned int reg) { … } static bool xtfpga_i2s_volatile_reg(struct device *dev, unsigned int reg) { … } static const struct regmap_config xtfpga_i2s_regmap_config = …; /* Generate functions that do PIO from TX DMA area to FIFO for all supported * stream formats. * Functions will be called xtfpga_pcm_tx_<channels>x<sample bits>, e.g. * xtfpga_pcm_tx_2x16 for 16-bit stereo. * * FIFO consists of 32-bit words, one word per channel, always 2 channels. * If I2S interface is configured with smaller sample resolution, only * the LSB of each word is used. */ #define xtfpga_pcm_tx_fn … xtfpga_pcm_tx_fn(1, 16) xtfpga_pcm_tx_fn(2, 16) xtfpga_pcm_tx_fn(1, 32) xtfpga_pcm_tx_fn(2, 32) #undef xtfpga_pcm_tx_fn static bool xtfpga_pcm_push_tx(struct xtfpga_i2s *i2s) { … } static void xtfpga_pcm_refill_fifo(struct xtfpga_i2s *i2s) { … } static irqreturn_t xtfpga_i2s_threaded_irq_handler(int irq, void *dev_id) { … } static int xtfpga_i2s_startup(struct snd_pcm_substream *substream, struct snd_soc_dai *dai) { … } static int xtfpga_i2s_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params, struct snd_soc_dai *dai) { … } static int xtfpga_i2s_set_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt) { … } /* PCM */ static const struct snd_pcm_hardware xtfpga_pcm_hardware = …; static int xtfpga_pcm_open(struct snd_soc_component *component, struct snd_pcm_substream *substream) { … } static int xtfpga_pcm_close(struct snd_soc_component *component, struct snd_pcm_substream *substream) { … } static int xtfpga_pcm_hw_params(struct snd_soc_component *component, struct snd_pcm_substream *substream, struct snd_pcm_hw_params *hw_params) { … } static int xtfpga_pcm_trigger(struct snd_soc_component *component, struct snd_pcm_substream *substream, int cmd) { … } static snd_pcm_uframes_t xtfpga_pcm_pointer(struct snd_soc_component *component, struct snd_pcm_substream *substream) { … } static int xtfpga_pcm_new(struct snd_soc_component *component, struct snd_soc_pcm_runtime *rtd) { … } static const struct snd_soc_component_driver xtfpga_i2s_component = …; static const struct snd_soc_dai_ops xtfpga_i2s_dai_ops = …; static struct snd_soc_dai_driver xtfpga_i2s_dai[] = …; static int xtfpga_i2s_runtime_suspend(struct device *dev) { … } static int xtfpga_i2s_runtime_resume(struct device *dev) { … } static int xtfpga_i2s_probe(struct platform_device *pdev) { … } static void xtfpga_i2s_remove(struct platform_device *pdev) { … } #ifdef CONFIG_OF static const struct of_device_id xtfpga_i2s_of_match[] = …; MODULE_DEVICE_TABLE(of, xtfpga_i2s_of_match); #endif static const struct dev_pm_ops xtfpga_i2s_pm_ops = …; static struct platform_driver xtfpga_i2s_driver = …; module_platform_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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