// SPDX-License-Identifier: GPL-2.0-only // // Apple SoCs MCA driver // // Copyright (C) The Asahi Linux Contributors // // The MCA peripheral is made up of a number of identical units called clusters. // Each cluster has its separate clock parent, SYNC signal generator, carries // four SERDES units and has a dedicated I2S port on the SoC's periphery. // // The clusters can operate independently, or can be combined together in a // configurable manner. We mostly treat them as self-contained independent // units and don't configure any cross-cluster connections except for the I2S // ports. The I2S ports can be routed to any of the clusters (irrespective // of their native cluster). We map this onto ASoC's (DPCM) notion of backend // and frontend DAIs. The 'cluster guts' are frontends which are dynamically // routed to backend I2S ports. // // DAI references in devicetree are resolved to backends. The routing between // frontends and backends is determined by the machine driver in the DAPM paths // it supplies. #include <linux/bitfield.h> #include <linux/clk.h> #include <linux/dma-mapping.h> #include <linux/init.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/of.h> #include <linux/of_clk.h> #include <linux/of_dma.h> #include <linux/platform_device.h> #include <linux/pm_domain.h> #include <linux/regmap.h> #include <linux/reset.h> #include <linux/slab.h> #include <sound/core.h> #include <sound/pcm.h> #include <sound/pcm_params.h> #include <sound/soc.h> #include <sound/dmaengine_pcm.h> #define USE_RXB_FOR_CAPTURE /* Relative to cluster base */ #define REG_STATUS … #define STATUS_MCLK_EN … #define REG_MCLK_CONF … #define MCLK_CONF_DIV … #define REG_SYNCGEN_STATUS … #define SYNCGEN_STATUS_EN … #define REG_SYNCGEN_MCLK_SEL … #define SYNCGEN_MCLK_SEL … #define REG_SYNCGEN_HI_PERIOD … #define REG_SYNCGEN_LO_PERIOD … #define REG_PORT_ENABLES … #define PORT_ENABLES_CLOCKS … #define PORT_ENABLES_TX_DATA … #define REG_PORT_CLOCK_SEL … #define PORT_CLOCK_SEL … #define REG_PORT_DATA_SEL … #define PORT_DATA_SEL_TXA(cl) … #define PORT_DATA_SEL_TXB(cl) … #define REG_INTSTATE … #define REG_INTMASK … /* Bases of serdes units (relative to cluster) */ #define CLUSTER_RXA_OFF … #define CLUSTER_TXA_OFF … #define CLUSTER_RXB_OFF … #define CLUSTER_TXB_OFF … #define CLUSTER_TX_OFF … #ifndef USE_RXB_FOR_CAPTURE #define CLUSTER_RX_OFF … #else #define CLUSTER_RX_OFF … #endif /* Relative to serdes unit base */ #define REG_SERDES_STATUS … #define SERDES_STATUS_EN … #define SERDES_STATUS_RST … #define REG_TX_SERDES_CONF … #define REG_RX_SERDES_CONF … #define SERDES_CONF_NCHANS … #define SERDES_CONF_WIDTH_MASK … #define SERDES_CONF_WIDTH_16BIT … #define SERDES_CONF_WIDTH_20BIT … #define SERDES_CONF_WIDTH_24BIT … #define SERDES_CONF_WIDTH_32BIT … #define SERDES_CONF_BCLK_POL … #define SERDES_CONF_LSB_FIRST … #define SERDES_CONF_UNK1 … #define SERDES_CONF_UNK2 … #define SERDES_CONF_UNK3 … #define SERDES_CONF_NO_DATA_FEEDBACK … #define SERDES_CONF_SYNC_SEL … #define REG_TX_SERDES_BITSTART … #define REG_RX_SERDES_BITSTART … #define REG_TX_SERDES_SLOTMASK … #define REG_RX_SERDES_SLOTMASK … #define REG_RX_SERDES_PORT … /* Relative to switch base */ #define REG_DMA_ADAPTER_A(cl) … #define REG_DMA_ADAPTER_B(cl) … #define DMA_ADAPTER_TX_LSB_PAD … #define DMA_ADAPTER_TX_NCHANS … #define DMA_ADAPTER_RX_MSB_PAD … #define DMA_ADAPTER_RX_NCHANS … #define DMA_ADAPTER_NCHANS … #define SWITCH_STRIDE … #define CLUSTER_STRIDE … #define MAX_NCLUSTERS … #define APPLE_MCA_FMTBITS … struct mca_cluster { … }; struct mca_data { … }; static void mca_modify(struct mca_cluster *cl, int regoffset, u32 mask, u32 val) { … } /* * Get the cluster of FE or BE DAI */ static struct mca_cluster *mca_dai_to_cluster(struct snd_soc_dai *dai) { … } /* called before PCM trigger */ static void mca_fe_early_trigger(struct snd_pcm_substream *substream, int cmd, struct snd_soc_dai *dai) { … } static int mca_fe_trigger(struct snd_pcm_substream *substream, int cmd, struct snd_soc_dai *dai) { … } static int mca_fe_enable_clocks(struct mca_cluster *cl) { … } static void mca_fe_disable_clocks(struct mca_cluster *cl) { … } static bool mca_fe_clocks_in_use(struct mca_cluster *cl) { … } static int mca_be_prepare(struct snd_pcm_substream *substream, struct snd_soc_dai *dai) { … } static int mca_be_hw_free(struct snd_pcm_substream *substream, struct snd_soc_dai *dai) { … } static unsigned int mca_crop_mask(unsigned int mask, int nchans) { … } static int mca_configure_serdes(struct mca_cluster *cl, int serdes_unit, unsigned int mask, int slots, int nchans, int slot_width, bool is_tx, int port) { … } static int mca_fe_set_tdm_slot(struct snd_soc_dai *dai, unsigned int tx_mask, unsigned int rx_mask, int slots, int slot_width) { … } static int mca_fe_set_fmt(struct snd_soc_dai *dai, unsigned int fmt) { … } static int mca_set_bclk_ratio(struct snd_soc_dai *dai, unsigned int ratio) { … } static int mca_fe_get_port(struct snd_pcm_substream *substream) { … } static int mca_fe_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params, struct snd_soc_dai *dai) { … } static const struct snd_soc_dai_ops mca_fe_ops = …; static bool mca_be_started(struct mca_cluster *cl) { … } static int mca_be_startup(struct snd_pcm_substream *substream, struct snd_soc_dai *dai) { … } static void mca_be_shutdown(struct snd_pcm_substream *substream, struct snd_soc_dai *dai) { … } static const struct snd_soc_dai_ops mca_be_ops = …; static int mca_set_runtime_hwparams(struct snd_soc_component *component, struct snd_pcm_substream *substream, struct dma_chan *chan) { … } static int mca_pcm_open(struct snd_soc_component *component, struct snd_pcm_substream *substream) { … } static int mca_hw_params(struct snd_soc_component *component, struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params) { … } static int mca_close(struct snd_soc_component *component, struct snd_pcm_substream *substream) { … } static int mca_trigger(struct snd_soc_component *component, struct snd_pcm_substream *substream, int cmd) { … } static snd_pcm_uframes_t mca_pointer(struct snd_soc_component *component, struct snd_pcm_substream *substream) { … } static struct dma_chan *mca_request_dma_channel(struct mca_cluster *cl, unsigned int stream) { … } static void mca_pcm_free(struct snd_soc_component *component, struct snd_pcm *pcm) { … } static int mca_pcm_new(struct snd_soc_component *component, struct snd_soc_pcm_runtime *rtd) { … } static const struct snd_soc_component_driver mca_component = …; static void apple_mca_release(struct mca_data *mca) { … } static int apple_mca_probe(struct platform_device *pdev) { … } static void apple_mca_remove(struct platform_device *pdev) { … } static const struct of_device_id apple_mca_of_match[] = …; MODULE_DEVICE_TABLE(of, apple_mca_of_match); static struct platform_driver apple_mca_driver = …; module_platform_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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