drivers/soundwire/cadence_master.h

/* SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause) */
/* Copyright(c) 2015-17 Intel Corporation. */
#include <sound/soc.h>

#ifndef __SDW_CADENCE_H
#define __SDW_CADENCE_H

#define SDW_CADENCE_GSYNC_KHZ		4 /* 4 kHz */
#define SDW_CADENCE_GSYNC_HZ		(SDW_CADENCE_GSYNC_KHZ * 1000)

/*
 * The Cadence IP supports up to 32 entries in the FIFO, though implementations
 * can configure the IP to have a smaller FIFO.
 */
#define CDNS_MCP_IP_MAX_CMD_LEN		32

#define SDW_CADENCE_MCP_IP_OFFSET	0x4000

/**
 * struct sdw_cdns_pdi: PDI (Physical Data Interface) instance
 *
 * @num: pdi number
 * @intel_alh_id: link identifier
 * @l_ch_num: low channel for PDI
 * @h_ch_num: high channel for PDI
 * @ch_count: total channel count for PDI
 * @dir: data direction
 * @type: stream type, (only PCM supported)
 */
struct sdw_cdns_pdi {
	int num;
	int intel_alh_id;
	int l_ch_num;
	int h_ch_num;
	int ch_count;
	enum sdw_data_direction dir;
	enum sdw_stream_type type;
};

/**
 * struct sdw_cdns_streams: Cadence stream data structure
 *
 * @num_bd: number of bidirectional streams
 * @num_in: number of input streams
 * @num_out: number of output streams
 * @num_ch_bd: number of bidirectional stream channels
 * @num_ch_bd: number of input stream channels
 * @num_ch_bd: number of output stream channels
 * @num_pdi: total number of PDIs
 * @bd: bidirectional streams
 * @in: input streams
 * @out: output streams
 */
struct sdw_cdns_streams {
	unsigned int num_bd;
	unsigned int num_in;
	unsigned int num_out;
	unsigned int num_ch_bd;
	unsigned int num_ch_in;
	unsigned int num_ch_out;
	unsigned int num_pdi;
	struct sdw_cdns_pdi *bd;
	struct sdw_cdns_pdi *in;
	struct sdw_cdns_pdi *out;
};

/**
 * struct sdw_cdns_stream_config: stream configuration
 *
 * @pcm_bd: number of bidirectional PCM streams supported
 * @pcm_in: number of input PCM streams supported
 * @pcm_out: number of output PCM streams supported
 */
struct sdw_cdns_stream_config {
	unsigned int pcm_bd;
	unsigned int pcm_in;
	unsigned int pcm_out;
};

/**
 * struct sdw_cdns_dai_runtime: Cadence DAI runtime data
 *
 * @name: SoundWire stream name
 * @stream: stream runtime
 * @pdi: PDI used for this dai
 * @bus: Bus handle
 * @stream_type: Stream type
 * @link_id: Master link id
 * @suspended: status set when suspended, to be used in .prepare
 * @paused: status set in .trigger, to be used in suspend
 * @direction: stream direction
 */
struct sdw_cdns_dai_runtime {
	char *name;
	struct sdw_stream_runtime *stream;
	struct sdw_cdns_pdi *pdi;
	struct sdw_bus *bus;
	enum sdw_stream_type stream_type;
	int link_id;
	bool suspended;
	bool paused;
	int direction;
};

/**
 * struct sdw_cdns - Cadence driver context
 * @dev: Linux device
 * @bus: Bus handle
 * @instance: instance number
 * @ip_offset: version-dependent offset to access IP_MCP registers and fields
 * @response_buf: SoundWire response buffer
 * @tx_complete: Tx completion
 * @ports: Data ports
 * @num_ports: Total number of data ports
 * @pcm: PCM streams
 * @registers: Cadence registers
 * @link_up: Link status
 * @msg_count: Messages sent on bus
 * @dai_runtime_array: runtime context for each allocated DAI.
 * @status_update_lock: protect concurrency between interrupt-based and delayed work
 * status update
 */
struct sdw_cdns {
	struct device *dev;
	struct sdw_bus bus;
	unsigned int instance;

	u32 ip_offset;

	/*
	 * The datasheet says the RX FIFO AVAIL can be 2 entries more
	 * than the FIFO capacity, so allow for this.
	 */
	u32 response_buf[CDNS_MCP_IP_MAX_CMD_LEN + 2];

	struct completion tx_complete;

	struct sdw_cdns_port *ports;
	int num_ports;

	struct sdw_cdns_streams pcm;

	int pdi_loopback_source;
	int pdi_loopback_target;

	void __iomem *registers;

	bool link_up;
	unsigned int msg_count;
	bool interrupt_enabled;

	struct work_struct work;
	struct delayed_work attach_dwork;

	struct list_head list;

	struct sdw_cdns_dai_runtime **dai_runtime_array;

	struct mutex status_update_lock; /* add mutual exclusion to sdw_handle_slave_status() */
};

#define bus_to_cdns(_bus) container_of(_bus, struct sdw_cdns, bus)

/* Exported symbols */

int sdw_cdns_probe(struct sdw_cdns *cdns);

irqreturn_t sdw_cdns_irq(int irq, void *dev_id);
irqreturn_t sdw_cdns_thread(int irq, void *dev_id);

int sdw_cdns_init(struct sdw_cdns *cdns);
int sdw_cdns_pdi_init(struct sdw_cdns *cdns,
		      struct sdw_cdns_stream_config config);
int sdw_cdns_exit_reset(struct sdw_cdns *cdns);
int sdw_cdns_enable_interrupt(struct sdw_cdns *cdns, bool state);

bool sdw_cdns_is_clock_stop(struct sdw_cdns *cdns);
int sdw_cdns_clock_stop(struct sdw_cdns *cdns, bool block_wake);
int sdw_cdns_clock_restart(struct sdw_cdns *cdns, bool bus_reset);

#ifdef CONFIG_DEBUG_FS
void sdw_cdns_debugfs_init(struct sdw_cdns *cdns, struct dentry *root);
#endif

struct sdw_cdns_pdi *sdw_cdns_alloc_pdi(struct sdw_cdns *cdns,
					struct sdw_cdns_streams *stream,
					u32 ch, u32 dir, int dai_id);
void sdw_cdns_config_stream(struct sdw_cdns *cdns,
			    u32 ch, u32 dir, struct sdw_cdns_pdi *pdi);

enum sdw_command_response
cdns_xfer_msg(struct sdw_bus *bus, struct sdw_msg *msg);

enum sdw_command_response
cdns_xfer_msg_defer(struct sdw_bus *bus);

u32 cdns_read_ping_status(struct sdw_bus *bus);

int cdns_bus_conf(struct sdw_bus *bus, struct sdw_bus_params *params);

int cdns_set_sdw_stream(struct snd_soc_dai *dai,
			void *stream, int direction);

void sdw_cdns_check_self_clearing_bits(struct sdw_cdns *cdns, const char *string,
				       bool initial_delay, int reset_iterations);

void sdw_cdns_config_update(struct sdw_cdns *cdns);
int sdw_cdns_config_update_set_wait(struct sdw_cdns *cdns);

#endif /* __SDW_CADENCE_H */