text: #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;
  };
  
  struct fw_attribute_group {
  	struct attribute_group *groups[2];
  	struct attribute_group group;
  	struct attribute *attrs[12];
  };
  
  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;
  
  	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;
  	/* Called when the parent device sits through a bus reset. */
  	void (*update)(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);
  /*
   * Important note:  Except for the FCP registers, the callback must guarantee
   * that either fw_send_response() or kfree() is called on the @request.
   */
  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;
  	size_t 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);
  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);
  
  static inline int fw_stream_packet_destination_id(int tag, int channel, int sy)
  {
  	return tag << 14 | channel << 8 | sy;
  }
  
  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 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;
  	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 */
  