// SPDX-License-Identifier: GPL-2.0 // // Freescale ESAI ALSA SoC Digital Audio Interface (DAI) driver // // Copyright (C) 2014 Freescale Semiconductor, Inc. #include <linux/clk.h> #include <linux/dmaengine.h> #include <linux/module.h> #include <linux/of_irq.h> #include <linux/of_platform.h> #include <linux/pm_runtime.h> #include <sound/dmaengine_pcm.h> #include <sound/pcm_params.h> #include "fsl_esai.h" #include "imx-pcm.h" #define FSL_ESAI_FORMATS … /** * struct fsl_esai_soc_data - soc specific data * @reset_at_xrun: flags for enable reset operaton */ struct fsl_esai_soc_data { … }; /** * struct fsl_esai - ESAI private data * @dma_params_rx: DMA parameters for receive channel * @dma_params_tx: DMA parameters for transmit channel * @pdev: platform device pointer * @regmap: regmap handler * @coreclk: clock source to access register * @extalclk: esai clock source to derive HCK, SCK and FS * @fsysclk: system clock source to derive HCK, SCK and FS * @spbaclk: SPBA clock (optional, depending on SoC design) * @work: work to handle the reset operation * @soc: soc specific data * @lock: spin lock between hw_reset() and trigger() * @fifo_depth: depth of tx/rx FIFO * @slot_width: width of each DAI slot * @slots: number of slots * @tx_mask: slot mask for TX * @rx_mask: slot mask for RX * @channels: channel num for tx or rx * @hck_rate: clock rate of desired HCKx clock * @sck_rate: clock rate of desired SCKx clock * @hck_dir: the direction of HCKx pads * @sck_div: if using PSR/PM dividers for SCKx clock * @consumer_mode: if fully using DAI clock consumer mode * @synchronous: if using tx/rx synchronous mode * @name: driver name */ struct fsl_esai { … }; static struct fsl_esai_soc_data fsl_esai_vf610 = …; static struct fsl_esai_soc_data fsl_esai_imx35 = …; static struct fsl_esai_soc_data fsl_esai_imx6ull = …; static irqreturn_t esai_isr(int irq, void *devid) { … } /** * fsl_esai_divisor_cal - This function is used to calculate the * divisors of psr, pm, fp and it is supposed to be called in * set_dai_sysclk() and set_bclk(). * * @dai: pointer to DAI * @tx: current setting is for playback or capture * @ratio: desired overall ratio for the paticipating dividers * @usefp: for HCK setting, there is no need to set fp divider * @fp: bypass other dividers by setting fp directly if fp != 0 */ static int fsl_esai_divisor_cal(struct snd_soc_dai *dai, bool tx, u32 ratio, bool usefp, u32 fp) { … } /** * fsl_esai_set_dai_sysclk - configure the clock frequency of MCLK (HCKT/HCKR) * @dai: pointer to DAI * @clk_id: The clock source of HCKT/HCKR * (Input from outside; output from inside, FSYS or EXTAL) * @freq: The required clock rate of HCKT/HCKR * @dir: The clock direction of HCKT/HCKR * * Note: If the direction is input, we do not care about clk_id. */ static int fsl_esai_set_dai_sysclk(struct snd_soc_dai *dai, int clk_id, unsigned int freq, int dir) { … } /** * fsl_esai_set_bclk - configure the related dividers according to the bclk rate * @dai: pointer to DAI * @tx: direction boolean * @freq: bclk freq */ static int fsl_esai_set_bclk(struct snd_soc_dai *dai, bool tx, u32 freq) { … } static int fsl_esai_set_dai_tdm_slot(struct snd_soc_dai *dai, u32 tx_mask, u32 rx_mask, int slots, int slot_width) { … } static int fsl_esai_set_dai_fmt(struct snd_soc_dai *dai, unsigned int fmt) { … } static int fsl_esai_startup(struct snd_pcm_substream *substream, struct snd_soc_dai *dai) { … } static int fsl_esai_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params, struct snd_soc_dai *dai) { … } static int fsl_esai_hw_init(struct fsl_esai *esai_priv) { … } static int fsl_esai_register_restore(struct fsl_esai *esai_priv) { … } static void fsl_esai_trigger_start(struct fsl_esai *esai_priv, bool tx) { … } static void fsl_esai_trigger_stop(struct fsl_esai *esai_priv, bool tx) { … } static void fsl_esai_hw_reset(struct work_struct *work) { … } static int fsl_esai_trigger(struct snd_pcm_substream *substream, int cmd, struct snd_soc_dai *dai) { … } static int fsl_esai_dai_probe(struct snd_soc_dai *dai) { … } static const struct snd_soc_dai_ops fsl_esai_dai_ops = …; static struct snd_soc_dai_driver fsl_esai_dai = …; static const struct snd_soc_component_driver fsl_esai_component = …; static const struct reg_default fsl_esai_reg_defaults[] = …; static bool fsl_esai_readable_reg(struct device *dev, unsigned int reg) { … } static bool fsl_esai_volatile_reg(struct device *dev, unsigned int reg) { … } static bool fsl_esai_writeable_reg(struct device *dev, unsigned int reg) { … } static const struct regmap_config fsl_esai_regmap_config = …; static int fsl_esai_runtime_resume(struct device *dev); static int fsl_esai_runtime_suspend(struct device *dev); static int fsl_esai_probe(struct platform_device *pdev) { … } static void fsl_esai_remove(struct platform_device *pdev) { … } static const struct of_device_id fsl_esai_dt_ids[] = …; MODULE_DEVICE_TABLE(of, fsl_esai_dt_ids); static int fsl_esai_runtime_resume(struct device *dev) { … } static int fsl_esai_runtime_suspend(struct device *dev) { … } static const struct dev_pm_ops fsl_esai_pm_ops = …; static struct platform_driver fsl_esai_driver = …; module_platform_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …; MODULE_ALIAS(…) …;
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