// SPDX-License-Identifier: GPL-2.0-or-later /* * Copyright 2011 Freescale Semiconductor, Inc. */ #include <linux/module.h> #include <linux/init.h> #include <linux/of.h> #include <linux/platform_device.h> #include <linux/slab.h> #include <linux/dma-mapping.h> #include <linux/clk.h> #include <linux/clk-provider.h> #include <linux/delay.h> #include <linux/io.h> #include <linux/time.h> #include <sound/core.h> #include <sound/pcm.h> #include <sound/pcm_params.h> #include <sound/soc.h> #include "mxs-saif.h" #define MXS_SET_ADDR … #define MXS_CLR_ADDR … static struct mxs_saif *mxs_saif[2]; /* * SAIF is a little different with other normal SOC DAIs on clock using. * * For MXS, two SAIF modules are instantiated on-chip. * Each SAIF has a set of clock pins and can be operating in master * mode simultaneously if they are connected to different off-chip codecs. * Also, one of the two SAIFs can master or drive the clock pins while the * other SAIF, in slave mode, receives clocking from the master SAIF. * This also means that both SAIFs must operate at the same sample rate. * * We abstract this as each saif has a master, the master could be * itself or other saifs. In the generic saif driver, saif does not need * to know the different clkmux. Saif only needs to know who is its master * and operating its master to generate the proper clock rate for it. * The master id is provided in mach-specific layer according to different * clkmux setting. */ static int mxs_saif_set_dai_sysclk(struct snd_soc_dai *cpu_dai, int clk_id, unsigned int freq, int dir) { … } /* * Since SAIF may work on EXTMASTER mode, IOW, it's working BITCLK&LRCLK * is provided by other SAIF, we provide a interface here to get its master * from its master_id. * Note that the master could be itself. */ static inline struct mxs_saif *mxs_saif_get_master(struct mxs_saif * saif) { … } /* * Set SAIF clock and MCLK */ static int mxs_saif_set_clk(struct mxs_saif *saif, unsigned int mclk, unsigned int rate) { … } /* * Put and disable MCLK. */ int mxs_saif_put_mclk(unsigned int saif_id) { … } EXPORT_SYMBOL_GPL(…); /* * Get MCLK and set clock rate, then enable it * * This interface is used for codecs who are using MCLK provided * by saif. */ int mxs_saif_get_mclk(unsigned int saif_id, unsigned int mclk, unsigned int rate) { … } EXPORT_SYMBOL_GPL(…); /* * SAIF DAI format configuration. * Should only be called when port is inactive. */ static int mxs_saif_set_dai_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt) { … } static int mxs_saif_startup(struct snd_pcm_substream *substream, struct snd_soc_dai *cpu_dai) { … } static void mxs_saif_shutdown(struct snd_pcm_substream *substream, struct snd_soc_dai *cpu_dai) { … } /* * Should only be called when port is inactive. * although can be called multiple times by upper layers. */ static int mxs_saif_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params, struct snd_soc_dai *cpu_dai) { … } static int mxs_saif_prepare(struct snd_pcm_substream *substream, struct snd_soc_dai *cpu_dai) { … } static int mxs_saif_trigger(struct snd_pcm_substream *substream, int cmd, struct snd_soc_dai *cpu_dai) { … } #define MXS_SAIF_RATES … #define MXS_SAIF_FORMATS … static const struct snd_soc_dai_ops mxs_saif_dai_ops = …; static struct snd_soc_dai_driver mxs_saif_dai = …; static const struct snd_soc_component_driver mxs_saif_component = …; static irqreturn_t mxs_saif_irq(int irq, void *dev_id) { … } static int mxs_saif_mclk_init(struct platform_device *pdev) { … } static int mxs_saif_probe(struct platform_device *pdev) { … } static const struct of_device_id mxs_saif_dt_ids[] = …; MODULE_DEVICE_TABLE(of, mxs_saif_dt_ids); static struct platform_driver mxs_saif_driver = …; module_platform_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …; MODULE_ALIAS(…) …;
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