include/linux/firewire.h - third_party/kernel - Git at Google

 /* SPDX-License-Identifier: GPL-2.0 */
 #ifndef _LINUX_FIREWIRE_H
 #define _LINUX_FIREWIRE_H

 #include <linux/completion.h>
 #include <linux/device.h>
 #include <linux/dma-mapping.h>
 #include <linux/kernel.h>
 #include <linux/kref.h>
 #include <linux/list.h>
 #include <linux/mutex.h>
 #include <linux/spinlock.h>
 #include <linux/sysfs.h>
 #include <linux/timer.h>
 #include <linux/types.h>
 #include <linux/workqueue.h>

 #include <linux/atomic.h>
 #include <asm/byteorder.h>

 #define CSR_REGISTER_BASE		0xfffff0000000ULL

 /* register offsets are relative to CSR_REGISTER_BASE */
 #define CSR_STATE_CLEAR			0x0
 #define CSR_STATE_SET			0x4
 #define CSR_NODE_IDS			0x8
 #define CSR_RESET_START			0xc
 #define CSR_SPLIT_TIMEOUT_HI		0x18
 #define CSR_SPLIT_TIMEOUT_LO		0x1c
 #define CSR_CYCLE_TIME			0x200
 #define CSR_BUS_TIME			0x204
 #define CSR_BUSY_TIMEOUT		0x210
 #define CSR_PRIORITY_BUDGET		0x218
 #define CSR_BUS_MANAGER_ID		0x21c
 #define CSR_BANDWIDTH_AVAILABLE		0x220
 #define CSR_CHANNELS_AVAILABLE		0x224
 #define CSR_CHANNELS_AVAILABLE_HI	0x224
 #define CSR_CHANNELS_AVAILABLE_LO	0x228
 #define CSR_MAINT_UTILITY		0x230
 #define CSR_BROADCAST_CHANNEL		0x234
 #define CSR_CONFIG_ROM			0x400
 #define CSR_CONFIG_ROM_END		0x800
 #define CSR_OMPR			0x900
 #define CSR_OPCR(i)			(0x904 + (i) * 4)
 #define CSR_IMPR			0x980
 #define CSR_IPCR(i)			(0x984 + (i) * 4)
 #define CSR_FCP_COMMAND			0xB00
 #define CSR_FCP_RESPONSE		0xD00
 #define CSR_FCP_END			0xF00
 #define CSR_TOPOLOGY_MAP		0x1000
 #define CSR_TOPOLOGY_MAP_END		0x1400
 #define CSR_SPEED_MAP			0x2000
 #define CSR_SPEED_MAP_END		0x3000

 #define CSR_OFFSET		0x40
 #define CSR_LEAF		0x80
 #define CSR_DIRECTORY		0xc0

 #define CSR_DESCRIPTOR		0x01
 #define CSR_VENDOR		0x03
 #define CSR_HARDWARE_VERSION	0x04
 #define CSR_UNIT		0x11
 #define CSR_SPECIFIER_ID	0x12
 #define CSR_VERSION		0x13
 #define CSR_DEPENDENT_INFO	0x14
 #define CSR_MODEL		0x17
 #define CSR_DIRECTORY_ID	0x20

 struct fw_csr_iterator {
 	const u32 *p;
 	const u32 *end;
 };

 void fw_csr_iterator_init(struct fw_csr_iterator *ci, const u32 *p);
 int fw_csr_iterator_next(struct fw_csr_iterator *ci, int *key, int *value);
 int fw_csr_string(const u32 *directory, int key, char *buf, size_t size);

 extern struct bus_type fw_bus_type;

 struct fw_card_driver;
 struct fw_node;

 struct fw_card {
 	const struct fw_card_driver *driver;
 	struct device *device;
 	struct kref kref;
 	struct completion done;

 	int node_id;
 	int generation;
 	int current_tlabel;
 	u64 tlabel_mask;
 	struct list_head transaction_list;
 	u64 reset_jiffies;

 	u32 split_timeout_hi;
 	u32 split_timeout_lo;
 	unsigned int split_timeout_cycles;
 	unsigned int split_timeout_jiffies;

 	unsigned long long guid;
 	unsigned max_receive;
 	int link_speed;
 	int config_rom_generation;

 	spinlock_t lock; /* Take this lock when handling the lists in
 			  * this struct. */
 	struct fw_node *local_node;
 	struct fw_node *root_node;
 	struct fw_node *irm_node;
 	u8 color; /* must be u8 to match the definition in struct fw_node */
 	int gap_count;
 	bool beta_repeaters_present;

 	int index;
 	struct list_head link;

 	struct list_head phy_receiver_list;

 	struct delayed_work br_work; /* bus reset job */
 	bool br_short;

 	struct delayed_work bm_work; /* bus manager job */
 	int bm_retries;
 	int bm_generation;
 	int bm_node_id;
 	bool bm_abdicate;

 	bool priority_budget_implemented;	/* controller feature */
 	bool broadcast_channel_auto_allocated;	/* controller feature */

 	bool broadcast_channel_allocated;
 	u32 broadcast_channel;
 	__be32 topology_map[(CSR_TOPOLOGY_MAP_END - CSR_TOPOLOGY_MAP) / 4];

 	__be32 maint_utility_register;
 };

 static inline struct fw_card *fw_card_get(struct fw_card *card)
 {
 	kref_get(&card->kref);

 	return card;
 }

 void fw_card_release(struct kref *kref);

 static inline void fw_card_put(struct fw_card *card)
 {
 	kref_put(&card->kref, fw_card_release);
 }

 struct fw_attribute_group {
 	struct attribute_group *groups[2];
 	struct attribute_group group;
 	struct attribute *attrs[13];
 };

 enum fw_device_state {
 	FW_DEVICE_INITIALIZING,
 	FW_DEVICE_RUNNING,
 	FW_DEVICE_GONE,
 	FW_DEVICE_SHUTDOWN,
 };

 /*
  * Note, fw_device.generation always has to be read before fw_device.node_id.
  * Use SMP memory barriers to ensure this.  Otherwise requests will be sent
  * to an outdated node_id if the generation was updated in the meantime due
  * to a bus reset.
  *
  * Likewise, fw-core will take care to update .node_id before .generation so
  * that whenever fw_device.generation is current WRT the actual bus generation,
  * fw_device.node_id is guaranteed to be current too.
  *
  * The same applies to fw_device.card->node_id vs. fw_device.generation.
  *
  * fw_device.config_rom and fw_device.config_rom_length may be accessed during
  * the lifetime of any fw_unit belonging to the fw_device, before device_del()
  * was called on the last fw_unit.  Alternatively, they may be accessed while
  * holding fw_device_rwsem.
  */
 struct fw_device {
 	atomic_t state;
 	struct fw_node *node;
 	int node_id;
 	int generation;
 	unsigned max_speed;
 	struct fw_card *card;
 	struct device device;

 	struct mutex client_list_mutex;
 	struct list_head client_list;

 	const u32 *config_rom;
 	size_t config_rom_length;
 	int config_rom_retries;
 	unsigned is_local:1;
 	unsigned max_rec:4;
 	unsigned cmc:1;
 	unsigned irmc:1;
 	unsigned bc_implemented:2;

 	work_func_t workfn;
 	struct delayed_work work;
 	struct fw_attribute_group attribute_group;
 };

 static inline struct fw_device *fw_device(struct device *dev)
 {
 	return container_of(dev, struct fw_device, device);
 }

 static inline int fw_device_is_shutdown(struct fw_device *device)
 {
 	return atomic_read(&device->state) == FW_DEVICE_SHUTDOWN;
 }

 int fw_device_enable_phys_dma(struct fw_device *device);

 /*
  * fw_unit.directory must not be accessed after device_del(&fw_unit.device).
  */
 struct fw_unit {
 	struct device device;
 	const u32 *directory;
 	struct fw_attribute_group attribute_group;
 };

 static inline struct fw_unit *fw_unit(struct device *dev)
 {
 	return container_of(dev, struct fw_unit, device);
 }

 static inline struct fw_unit *fw_unit_get(struct fw_unit *unit)
 {
 	get_device(&unit->device);

 	return unit;
 }

 static inline void fw_unit_put(struct fw_unit *unit)
 {
 	put_device(&unit->device);
 }

 static inline struct fw_device *fw_parent_device(struct fw_unit *unit)
 {
 	return fw_device(unit->device.parent);
 }

 struct ieee1394_device_id;

 struct fw_driver {
 	struct device_driver driver;
 	int (*probe)(struct fw_unit *unit, const struct ieee1394_device_id *id);
 	/* Called when the parent device sits through a bus reset. */
 	void (*update)(struct fw_unit *unit);
 	void (*remove)(struct fw_unit *unit);
 	const struct ieee1394_device_id *id_table;
 };

 struct fw_packet;
 struct fw_request;

 typedef void (*fw_packet_callback_t)(struct fw_packet *packet,
 				     struct fw_card *card, int status);
 typedef void (*fw_transaction_callback_t)(struct fw_card *card, int rcode,
 					  void *data, size_t length,
 					  void *callback_data);
 /*
  * This callback handles an inbound request subaction.  It is called in
  * RCU read-side context, therefore must not sleep.
  *
  * The callback should not initiate outbound request subactions directly.
  * Otherwise there is a danger of recursion of inbound and outbound
  * transactions from and to the local node.
  *
  * The callback is responsible that either fw_send_response() or kfree()
  * is called on the @request, except for FCP registers for which the core
  * takes care of that.
  */
 typedef void (*fw_address_callback_t)(struct fw_card *card,
 				      struct fw_request *request,
 				      int tcode, int destination, int source,
 				      int generation,
 				      unsigned long long offset,
 				      void *data, size_t length,
 				      void *callback_data);

 struct fw_packet {
 	int speed;
 	int generation;
 	u32 header[4];
 	size_t header_length;
 	void *payload;
 	size_t payload_length;
 	dma_addr_t payload_bus;
 	bool payload_mapped;
 	u32 timestamp;

 	/*
 	 * This callback is called when the packet transmission has completed.
 	 * For successful transmission, the status code is the ack received
 	 * from the destination.  Otherwise it is one of the juju-specific
 	 * rcodes:  RCODE_SEND_ERROR, _CANCELLED, _BUSY, _GENERATION, _NO_ACK.
 	 * The callback can be called from tasklet context and thus
 	 * must never block.
 	 */
 	fw_packet_callback_t callback;
 	int ack;
 	struct list_head link;
 	void *driver_data;
 };

 struct fw_transaction {
 	int node_id; /* The generation is implied; it is always the current. */
 	int tlabel;
 	struct list_head link;
 	struct fw_card *card;
 	bool is_split_transaction;
 	struct timer_list split_timeout_timer;

 	struct fw_packet packet;

 	/*
 	 * The data passed to the callback is valid only during the
 	 * callback.
 	 */
 	fw_transaction_callback_t callback;
 	void *callback_data;
 };

 struct fw_address_handler {
 	u64 offset;
 	u64 length;
 	fw_address_callback_t address_callback;
 	void *callback_data;
 	struct list_head link;
 };

 struct fw_address_region {
 	u64 start;
 	u64 end;
 };

 extern const struct fw_address_region fw_high_memory_region;

 int fw_core_add_address_handler(struct fw_address_handler *handler,
 				const struct fw_address_region *region);
 void fw_core_remove_address_handler(struct fw_address_handler *handler);
 void fw_send_response(struct fw_card *card,
 		      struct fw_request *request, int rcode);
 int fw_get_request_speed(struct fw_request *request);
 void fw_send_request(struct fw_card *card, struct fw_transaction *t,
 		     int tcode, int destination_id, int generation, int speed,
 		     unsigned long long offset, void *payload, size_t length,
 		     fw_transaction_callback_t callback, void *callback_data);
 int fw_cancel_transaction(struct fw_card *card,
 			  struct fw_transaction *transaction);
 int fw_run_transaction(struct fw_card *card, int tcode, int destination_id,
 		       int generation, int speed, unsigned long long offset,
 		       void *payload, size_t length);
 const char *fw_rcode_string(int rcode);

 static inline int fw_stream_packet_destination_id(int tag, int channel, int sy)
 {
 	return tag << 14 | channel << 8 | sy;
 }

 void fw_schedule_bus_reset(struct fw_card *card, bool delayed,
 			   bool short_reset);

 struct fw_descriptor {
 	struct list_head link;
 	size_t length;
 	u32 immediate;
 	u32 key;
 	const u32 *data;
 };

 int fw_core_add_descriptor(struct fw_descriptor *desc);
 void fw_core_remove_descriptor(struct fw_descriptor *desc);

 /*
  * The iso packet format allows for an immediate header/payload part
  * stored in 'header' immediately after the packet info plus an
  * indirect payload part that is pointer to by the 'payload' field.
  * Applications can use one or the other or both to implement simple
  * low-bandwidth streaming (e.g. audio) or more advanced
  * scatter-gather streaming (e.g. assembling video frame automatically).
  */
 struct fw_iso_packet {
 	u16 payload_length;	/* Length of indirect payload		*/
 	u32 interrupt:1;	/* Generate interrupt on this packet	*/
 	u32 skip:1;		/* tx: Set to not send packet at all	*/
 				/* rx: Sync bit, wait for matching sy	*/
 	u32 tag:2;		/* tx: Tag in packet header		*/
 	u32 sy:4;		/* tx: Sy in packet header		*/
 	u32 header_length:8;	/* Length of immediate header		*/
 	u32 header[0];		/* tx: Top of 1394 isoch. data_block	*/
 };

 #define FW_ISO_CONTEXT_TRANSMIT			0
 #define FW_ISO_CONTEXT_RECEIVE			1
 #define FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL	2

 #define FW_ISO_CONTEXT_MATCH_TAG0	 1
 #define FW_ISO_CONTEXT_MATCH_TAG1	 2
 #define FW_ISO_CONTEXT_MATCH_TAG2	 4
 #define FW_ISO_CONTEXT_MATCH_TAG3	 8
 #define FW_ISO_CONTEXT_MATCH_ALL_TAGS	15

 /*
  * An iso buffer is just a set of pages mapped for DMA in the
  * specified direction.  Since the pages are to be used for DMA, they
  * are not mapped into the kernel virtual address space.  We store the
  * DMA address in the page private. The helper function
  * fw_iso_buffer_map() will map the pages into a given vma.
  */
 struct fw_iso_buffer {
 	enum dma_data_direction direction;
 	struct page **pages;
 	int page_count;
 	int page_count_mapped;
 };

 int fw_iso_buffer_init(struct fw_iso_buffer *buffer, struct fw_card *card,
 		       int page_count, enum dma_data_direction direction);
 void fw_iso_buffer_destroy(struct fw_iso_buffer *buffer, struct fw_card *card);
 size_t fw_iso_buffer_lookup(struct fw_iso_buffer *buffer, dma_addr_t completed);

 struct fw_iso_context;
 typedef void (*fw_iso_callback_t)(struct fw_iso_context *context,
 				  u32 cycle, size_t header_length,
 				  void *header, void *data);
 typedef void (*fw_iso_mc_callback_t)(struct fw_iso_context *context,
 				     dma_addr_t completed, void *data);
 struct fw_iso_context {
 	struct fw_card *card;
 	int type;
 	int channel;
 	int speed;
 	bool drop_overflow_headers;
 	size_t header_size;
 	union {
 		fw_iso_callback_t sc;
 		fw_iso_mc_callback_t mc;
 	} callback;
 	void *callback_data;
 };

 struct fw_iso_context *fw_iso_context_create(struct fw_card *card,
 		int type, int channel, int speed, size_t header_size,
 		fw_iso_callback_t callback, void *callback_data);
 int fw_iso_context_set_channels(struct fw_iso_context *ctx, u64 *channels);
 int fw_iso_context_queue(struct fw_iso_context *ctx,
 			 struct fw_iso_packet *packet,
 			 struct fw_iso_buffer *buffer,
 			 unsigned long payload);
 void fw_iso_context_queue_flush(struct fw_iso_context *ctx);
 int fw_iso_context_flush_completions(struct fw_iso_context *ctx);
 int fw_iso_context_start(struct fw_iso_context *ctx,
 			 int cycle, int sync, int tags);
 int fw_iso_context_stop(struct fw_iso_context *ctx);
 void fw_iso_context_destroy(struct fw_iso_context *ctx);
 void fw_iso_resource_manage(struct fw_card *card, int generation,
 			    u64 channels_mask, int *channel, int *bandwidth,
 			    bool allocate);

 extern struct workqueue_struct *fw_workqueue;

 #endif /* _LINUX_FIREWIRE_H */
	/* SPDX-License-Identifier: GPL-2.0 */
	#ifndef _LINUX_FIREWIRE_H
	#define _LINUX_FIREWIRE_H

	#include <linux/completion.h>
	#include <linux/device.h>
	#include <linux/dma-mapping.h>
	#include <linux/kernel.h>
	#include <linux/kref.h>
	#include <linux/list.h>
	#include <linux/mutex.h>
	#include <linux/spinlock.h>
	#include <linux/sysfs.h>
	#include <linux/timer.h>
	#include <linux/types.h>
	#include <linux/workqueue.h>

	#include <linux/atomic.h>
	#include <asm/byteorder.h>

	#define CSR_REGISTER_BASE 0xfffff0000000ULL

	/* register offsets are relative to CSR_REGISTER_BASE */
	#define CSR_STATE_CLEAR 0x0
	#define CSR_STATE_SET 0x4
	#define CSR_NODE_IDS 0x8
	#define CSR_RESET_START 0xc
	#define CSR_SPLIT_TIMEOUT_HI 0x18
	#define CSR_SPLIT_TIMEOUT_LO 0x1c
	#define CSR_CYCLE_TIME 0x200
	#define CSR_BUS_TIME 0x204
	#define CSR_BUSY_TIMEOUT 0x210
	#define CSR_PRIORITY_BUDGET 0x218
	#define CSR_BUS_MANAGER_ID 0x21c
	#define CSR_BANDWIDTH_AVAILABLE 0x220
	#define CSR_CHANNELS_AVAILABLE 0x224
	#define CSR_CHANNELS_AVAILABLE_HI 0x224
	#define CSR_CHANNELS_AVAILABLE_LO 0x228
	#define CSR_MAINT_UTILITY 0x230
	#define CSR_BROADCAST_CHANNEL 0x234
	#define CSR_CONFIG_ROM 0x400
	#define CSR_CONFIG_ROM_END 0x800
	#define CSR_OMPR 0x900
	#define CSR_OPCR(i) (0x904 + (i) * 4)
	#define CSR_IMPR 0x980
	#define CSR_IPCR(i) (0x984 + (i) * 4)
	#define CSR_FCP_COMMAND 0xB00
	#define CSR_FCP_RESPONSE 0xD00
	#define CSR_FCP_END 0xF00
	#define CSR_TOPOLOGY_MAP 0x1000
	#define CSR_TOPOLOGY_MAP_END 0x1400
	#define CSR_SPEED_MAP 0x2000
	#define CSR_SPEED_MAP_END 0x3000

	#define CSR_OFFSET 0x40
	#define CSR_LEAF 0x80
	#define CSR_DIRECTORY 0xc0

	#define CSR_DESCRIPTOR 0x01
	#define CSR_VENDOR 0x03
	#define CSR_HARDWARE_VERSION 0x04
	#define CSR_UNIT 0x11
	#define CSR_SPECIFIER_ID 0x12
	#define CSR_VERSION 0x13
	#define CSR_DEPENDENT_INFO 0x14
	#define CSR_MODEL 0x17
	#define CSR_DIRECTORY_ID 0x20

	struct fw_csr_iterator {
	const u32 *p;
	const u32 *end;
	};

	void fw_csr_iterator_init(struct fw_csr_iterator ci, const u32 p);
	int fw_csr_iterator_next(struct fw_csr_iterator ci, int key, int *value);
	int fw_csr_string(const u32 directory, int key, char buf, size_t size);

	extern struct bus_type fw_bus_type;

	struct fw_card_driver;
	struct fw_node;

	struct fw_card {
	const struct fw_card_driver *driver;
	struct device *device;
	struct kref kref;
	struct completion done;

	int node_id;
	int generation;
	int current_tlabel;
	u64 tlabel_mask;
	struct list_head transaction_list;
	u64 reset_jiffies;

	u32 split_timeout_hi;
	u32 split_timeout_lo;
	unsigned int split_timeout_cycles;
	unsigned int split_timeout_jiffies;

	unsigned long long guid;
	unsigned max_receive;
	int link_speed;
	int config_rom_generation;

	spinlock_t lock; /* Take this lock when handling the lists in
	* this struct. */
	struct fw_node *local_node;
	struct fw_node *root_node;
	struct fw_node *irm_node;
	u8 color; /* must be u8 to match the definition in struct fw_node */
	int gap_count;
	bool beta_repeaters_present;

	int index;
	struct list_head link;

	struct list_head phy_receiver_list;

	struct delayed_work br_work; /* bus reset job */
	bool br_short;

	struct delayed_work bm_work; /* bus manager job */
	int bm_retries;
	int bm_generation;
	int bm_node_id;
	bool bm_abdicate;

	bool priority_budget_implemented; /* controller feature */
	bool broadcast_channel_auto_allocated; /* controller feature */

	bool broadcast_channel_allocated;
	u32 broadcast_channel;
	__be32 topology_map[(CSR_TOPOLOGY_MAP_END - CSR_TOPOLOGY_MAP) / 4];

	__be32 maint_utility_register;
	};

	static inline struct fw_card fw_card_get(struct fw_card card)
	{
	kref_get(&card->kref);

	return card;
	}

	void fw_card_release(struct kref *kref);

	static inline void fw_card_put(struct fw_card *card)
	{
	kref_put(&card->kref, fw_card_release);
	}

	struct fw_attribute_group {
	struct attribute_group *groups[2];
	struct attribute_group group;
	struct attribute *attrs[13];
	};

	enum fw_device_state {
	FW_DEVICE_INITIALIZING,
	FW_DEVICE_RUNNING,
	FW_DEVICE_GONE,
	FW_DEVICE_SHUTDOWN,
	};

	/*
	* Note, fw_device.generation always has to be read before fw_device.node_id.
	* Use SMP memory barriers to ensure this. Otherwise requests will be sent
	* to an outdated node_id if the generation was updated in the meantime due
	* to a bus reset.
	*
	* Likewise, fw-core will take care to update .node_id before .generation so
	* that whenever fw_device.generation is current WRT the actual bus generation,
	* fw_device.node_id is guaranteed to be current too.
	*
	* The same applies to fw_device.card->node_id vs. fw_device.generation.
	*
	* fw_device.config_rom and fw_device.config_rom_length may be accessed during
	* the lifetime of any fw_unit belonging to the fw_device, before device_del()
	* was called on the last fw_unit. Alternatively, they may be accessed while
	* holding fw_device_rwsem.
	*/
	struct fw_device {
	atomic_t state;
	struct fw_node *node;
	int node_id;
	int generation;
	unsigned max_speed;
	struct fw_card *card;
	struct device device;

	struct mutex client_list_mutex;
	struct list_head client_list;

	const u32 *config_rom;
	size_t config_rom_length;
	int config_rom_retries;
	unsigned is_local:1;
	unsigned max_rec:4;
	unsigned cmc:1;
	unsigned irmc:1;
	unsigned bc_implemented:2;

	work_func_t workfn;
	struct delayed_work work;
	struct fw_attribute_group attribute_group;
	};

	static inline struct fw_device fw_device(struct device dev)
	{
	return container_of(dev, struct fw_device, device);
	}

	static inline int fw_device_is_shutdown(struct fw_device *device)
	{
	return atomic_read(&device->state) == FW_DEVICE_SHUTDOWN;
	}

	int fw_device_enable_phys_dma(struct fw_device *device);

	/*
	* fw_unit.directory must not be accessed after device_del(&fw_unit.device).
	*/
	struct fw_unit {
	struct device device;
	const u32 *directory;
	struct fw_attribute_group attribute_group;
	};

	static inline struct fw_unit fw_unit(struct device dev)
	{
	return container_of(dev, struct fw_unit, device);
	}

	static inline struct fw_unit fw_unit_get(struct fw_unit unit)
	{
	get_device(&unit->device);

	return unit;
	}

	static inline void fw_unit_put(struct fw_unit *unit)
	{
	put_device(&unit->device);
	}

	static inline struct fw_device fw_parent_device(struct fw_unit unit)
	{
	return fw_device(unit->device.parent);
	}

	struct ieee1394_device_id;

	struct fw_driver {
	struct device_driver driver;
	int (probe)(struct fw_unit unit, const struct ieee1394_device_id *id);
	/* Called when the parent device sits through a bus reset. */
	void (update)(struct fw_unit unit);
	void (remove)(struct fw_unit unit);
	const struct ieee1394_device_id *id_table;
	};

	struct fw_packet;
	struct fw_request;

	typedef void (fw_packet_callback_t)(struct fw_packet packet,
	struct fw_card *card, int status);
	typedef void (fw_transaction_callback_t)(struct fw_card card, int rcode,
	void *data, size_t length,
	void *callback_data);
	/*
	* This callback handles an inbound request subaction. It is called in
	* RCU read-side context, therefore must not sleep.
	*
	* The callback should not initiate outbound request subactions directly.
	* Otherwise there is a danger of recursion of inbound and outbound
	* transactions from and to the local node.
	*
	* The callback is responsible that either fw_send_response() or kfree()
	* is called on the @request, except for FCP registers for which the core
	* takes care of that.
	*/
	typedef void (fw_address_callback_t)(struct fw_card card,
	struct fw_request *request,
	int tcode, int destination, int source,
	int generation,
	unsigned long long offset,
	void *data, size_t length,
	void *callback_data);

	struct fw_packet {
	int speed;
	int generation;
	u32 header[4];
	size_t header_length;
	void *payload;
	size_t payload_length;
	dma_addr_t payload_bus;
	bool payload_mapped;
	u32 timestamp;

	/*
	* This callback is called when the packet transmission has completed.
	* For successful transmission, the status code is the ack received
	* from the destination. Otherwise it is one of the juju-specific
	* rcodes: RCODE_SEND_ERROR, _CANCELLED, _BUSY, _GENERATION, _NO_ACK.
	* The callback can be called from tasklet context and thus
	* must never block.
	*/
	fw_packet_callback_t callback;
	int ack;
	struct list_head link;
	void *driver_data;
	};

	struct fw_transaction {
	int node_id; /* The generation is implied; it is always the current. */
	int tlabel;
	struct list_head link;
	struct fw_card *card;
	bool is_split_transaction;
	struct timer_list split_timeout_timer;

	struct fw_packet packet;

	/*
	* The data passed to the callback is valid only during the
	* callback.
	*/
	fw_transaction_callback_t callback;
	void *callback_data;
	};

	struct fw_address_handler {
	u64 offset;
	u64 length;
	fw_address_callback_t address_callback;
	void *callback_data;
	struct list_head link;
	};

	struct fw_address_region {
	u64 start;
	u64 end;
	};

	extern const struct fw_address_region fw_high_memory_region;

	int fw_core_add_address_handler(struct fw_address_handler *handler,
	const struct fw_address_region *region);
	void fw_core_remove_address_handler(struct fw_address_handler *handler);
	void fw_send_response(struct fw_card *card,
	struct fw_request *request, int rcode);
	int fw_get_request_speed(struct fw_request *request);
	void fw_send_request(struct fw_card card, struct fw_transaction t,
	int tcode, int destination_id, int generation, int speed,
	unsigned long long offset, void *payload, size_t length,
	fw_transaction_callback_t callback, void *callback_data);
	int fw_cancel_transaction(struct fw_card *card,
	struct fw_transaction *transaction);
	int fw_run_transaction(struct fw_card *card, int tcode, int destination_id,
	int generation, int speed, unsigned long long offset,
	void *payload, size_t length);
	const char *fw_rcode_string(int rcode);

	static inline int fw_stream_packet_destination_id(int tag, int channel, int sy)
	{
	return tag << 14 \| channel << 8 \| sy;
	}

	void fw_schedule_bus_reset(struct fw_card *card, bool delayed,
	bool short_reset);

	struct fw_descriptor {
	struct list_head link;
	size_t length;
	u32 immediate;
	u32 key;
	const u32 *data;
	};

	int fw_core_add_descriptor(struct fw_descriptor *desc);
	void fw_core_remove_descriptor(struct fw_descriptor *desc);

	/*
	* The iso packet format allows for an immediate header/payload part
	* stored in 'header' immediately after the packet info plus an
	* indirect payload part that is pointer to by the 'payload' field.
	* Applications can use one or the other or both to implement simple
	* low-bandwidth streaming (e.g. audio) or more advanced
	* scatter-gather streaming (e.g. assembling video frame automatically).
	*/
	struct fw_iso_packet {
	u16 payload_length; /* Length of indirect payload */
	u32 interrupt:1; /* Generate interrupt on this packet */
	u32 skip:1; /* tx: Set to not send packet at all */
	/* rx: Sync bit, wait for matching sy */
	u32 tag:2; /* tx: Tag in packet header */
	u32 sy:4; /* tx: Sy in packet header */
	u32 header_length:8; /* Length of immediate header */
	u32 header[0]; /* tx: Top of 1394 isoch. data_block */
	};

	#define FW_ISO_CONTEXT_TRANSMIT 0
	#define FW_ISO_CONTEXT_RECEIVE 1
	#define FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL 2

	#define FW_ISO_CONTEXT_MATCH_TAG0 1
	#define FW_ISO_CONTEXT_MATCH_TAG1 2
	#define FW_ISO_CONTEXT_MATCH_TAG2 4
	#define FW_ISO_CONTEXT_MATCH_TAG3 8
	#define FW_ISO_CONTEXT_MATCH_ALL_TAGS 15

	/*
	* An iso buffer is just a set of pages mapped for DMA in the
	* specified direction. Since the pages are to be used for DMA, they
	* are not mapped into the kernel virtual address space. We store the
	* DMA address in the page private. The helper function
	* fw_iso_buffer_map() will map the pages into a given vma.
	*/
	struct fw_iso_buffer {
	enum dma_data_direction direction;
	struct page **pages;
	int page_count;
	int page_count_mapped;
	};

	int fw_iso_buffer_init(struct fw_iso_buffer buffer, struct fw_card card,
	int page_count, enum dma_data_direction direction);
	void fw_iso_buffer_destroy(struct fw_iso_buffer buffer, struct fw_card card);
	size_t fw_iso_buffer_lookup(struct fw_iso_buffer *buffer, dma_addr_t completed);

	struct fw_iso_context;
	typedef void (fw_iso_callback_t)(struct fw_iso_context context,
	u32 cycle, size_t header_length,
	void header, void data);
	typedef void (fw_iso_mc_callback_t)(struct fw_iso_context context,
	dma_addr_t completed, void *data);
	struct fw_iso_context {
	struct fw_card *card;
	int type;
	int channel;
	int speed;
	bool drop_overflow_headers;
	size_t header_size;
	union {
	fw_iso_callback_t sc;
	fw_iso_mc_callback_t mc;
	} callback;
	void *callback_data;
	};

	struct fw_iso_context fw_iso_context_create(struct fw_card card,
	int type, int channel, int speed, size_t header_size,
	fw_iso_callback_t callback, void *callback_data);
	int fw_iso_context_set_channels(struct fw_iso_context ctx, u64 channels);
	int fw_iso_context_queue(struct fw_iso_context *ctx,
	struct fw_iso_packet *packet,
	struct fw_iso_buffer *buffer,
	unsigned long payload);
	void fw_iso_context_queue_flush(struct fw_iso_context *ctx);
	int fw_iso_context_flush_completions(struct fw_iso_context *ctx);
	int fw_iso_context_start(struct fw_iso_context *ctx,
	int cycle, int sync, int tags);
	int fw_iso_context_stop(struct fw_iso_context *ctx);
	void fw_iso_context_destroy(struct fw_iso_context *ctx);
	void fw_iso_resource_manage(struct fw_card *card, int generation,
	u64 channels_mask, int channel, int bandwidth,
	bool allocate);

	extern struct workqueue_struct *fw_workqueue;

	#endif /* _LINUX_FIREWIRE_H */