Release 4.7 drivers/firewire/core.h

#ifndef _FIREWIRE_CORE_H

#define _FIREWIRE_CORE_H

#include <linux/compiler.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/fs.h>
#include <linux/list.h>
#include <linux/idr.h>
#include <linux/mm_types.h>
#include <linux/rwsem.h>
#include <linux/slab.h>
#include <linux/types.h>

#include <linux/atomic.h>

struct device;
struct fw_card;
struct fw_device;
struct fw_iso_buffer;
struct fw_iso_context;
struct fw_iso_packet;
struct fw_node;
struct fw_packet;


/* -card */

extern __printf(2, 3)
void fw_err(const struct fw_card *card, const char *fmt, ...);
extern __printf(2, 3)
void fw_notice(const struct fw_card *card, const char *fmt, ...);

/* bitfields within the PHY registers */

#define PHY_LINK_ACTIVE		0x80

#define PHY_CONTENDER		0x40

#define PHY_BUS_RESET		0x40

#define PHY_EXTENDED_REGISTERS	0xe0

#define PHY_BUS_SHORT_RESET	0x40

#define PHY_INT_STATUS_BITS	0x3c

#define PHY_ENABLE_ACCEL	0x02

#define PHY_ENABLE_MULTI	0x01

#define PHY_PAGE_SELECT		0xe0


#define BANDWIDTH_AVAILABLE_INITIAL	4915

#define BROADCAST_CHANNEL_INITIAL	(1 << 31 | 31)

#define BROADCAST_CHANNEL_VALID		(1 << 30)


#define CSR_STATE_BIT_CMSTR	(1 << 8)

#define CSR_STATE_BIT_ABDICATE	(1 << 10)


struct fw_card_driver {
	/*
         * Enable the given card with the given initial config rom.
         * This function is expected to activate the card, and either
         * enable the PHY or set the link_on bit and initiate a bus
         * reset.
         */
	
int (*enable)(struct fw_card *card,
		      const __be32 *config_rom, size_t length);

	
int (*read_phy_reg)(struct fw_card *card, int address);
	
int (*update_phy_reg)(struct fw_card *card, int address,
			      int clear_bits, int set_bits);

	/*
         * Update the config rom for an enabled card.  This function
         * should change the config rom that is presented on the bus
         * and initiate a bus reset.
         */
	
int (*set_config_rom)(struct fw_card *card,
			      const __be32 *config_rom, size_t length);

	
void (*send_request)(struct fw_card *card, struct fw_packet *packet);
	
void (*send_response)(struct fw_card *card, struct fw_packet *packet);
	/* Calling cancel is valid once a packet has been submitted. */
	
int (*cancel_packet)(struct fw_card *card, struct fw_packet *packet);

	/*
         * Allow the specified node ID to do direct DMA out and in of
         * host memory.  The card will disable this for all node when
         * a bus reset happens, so driver need to reenable this after
         * bus reset.  Returns 0 on success, -ENODEV if the card
         * doesn't support this, -ESTALE if the generation doesn't
         * match.
         */
	
int (*enable_phys_dma)(struct fw_card *card,
			       int node_id, int generation);

	
u32 (*read_csr)(struct fw_card *card, int csr_offset);
	
void (*write_csr)(struct fw_card *card, int csr_offset, u32 value);

	struct fw_iso_context *
	(
*allocate_iso_context)(struct fw_card *card,
				int type, int channel, size_t header_size);
	
void (*free_iso_context)(struct fw_iso_context *ctx);

	
int (*start_iso)(struct fw_iso_context *ctx,
			 s32 cycle, u32 sync, u32 tags);

	
int (*set_iso_channels)(struct fw_iso_context *ctx, u64 *channels);

	
int (*queue_iso)(struct fw_iso_context *ctx,
			 struct fw_iso_packet *packet,
			 struct fw_iso_buffer *buffer,
			 unsigned long payload);

	
void (*flush_queue_iso)(struct fw_iso_context *ctx);

	
int (*flush_iso_completions)(struct fw_iso_context *ctx);

	
int (*stop_iso)(struct fw_iso_context *ctx);
};

void fw_card_initialize(struct fw_card *card,
		const struct fw_card_driver *driver, struct device *device);
int fw_card_add(struct fw_card *card,
		u32 max_receive, u32 link_speed, u64 guid);
void fw_core_remove_card(struct fw_card *card);
int fw_compute_block_crc(__be32 *block);
void fw_schedule_bm_work(struct fw_card *card, unsigned long delay);

/* -cdev */

extern const struct file_operations fw_device_ops;

void fw_device_cdev_update(struct fw_device *device);
void fw_device_cdev_remove(struct fw_device *device);
void fw_cdev_handle_phy_packet(struct fw_card *card, struct fw_packet *p);


/* -device */

extern struct rw_semaphore fw_device_rwsem;
extern struct idr fw_device_idr;
extern int fw_cdev_major;



static inline struct fw_device *fw_device_get(struct fw_device *device)
{
	get_device(&device->device);

	return device;
}

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static inline void fw_device_put(struct fw_device *device)
{
	put_device(&device->device);
}

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struct fw_device *fw_device_get_by_devt(dev_t devt);
int fw_device_set_broadcast_channel(struct device *dev, void *gen);
void fw_node_event(struct fw_card *card, struct fw_node *node, int event);


/* -iso */

int fw_iso_buffer_alloc(struct fw_iso_buffer *buffer, int page_count);
int fw_iso_buffer_map_dma(struct fw_iso_buffer *buffer, struct fw_card *card,
			  enum dma_data_direction direction);
int fw_iso_buffer_map_vma(struct fw_iso_buffer *buffer,
			  struct vm_area_struct *vma);


/* -topology */

enum {
	
FW_NODE_CREATED,
	
FW_NODE_UPDATED,
	
FW_NODE_DESTROYED,
	
FW_NODE_LINK_ON,
	
FW_NODE_LINK_OFF,
	
FW_NODE_INITIATED_RESET,
};


struct fw_node {
	
u16 node_id;
	
u8 color;
	
u8 port_count;
	
u8 link_on:1;
	
u8 initiated_reset:1;
	
u8 b_path:1;
	
u8 phy_speed:2;	/* As in the self ID packet. */
	
u8 max_speed:2;	/* Minimum of all phy-speeds on the path from the
                         * local node to this node. */
	
u8 max_depth:4;	/* Maximum depth to any leaf node */
	
u8 max_hops:4;	/* Max hops in this sub tree */
	
atomic_t ref_count;

	/* For serializing node topology into a list. */
	
struct list_head link;

	/* Upper layer specific data. */
	
void *data;

	
struct fw_node *ports[0];
};



static inline struct fw_node *fw_node_get(struct fw_node *node)
{
	atomic_inc(&node->ref_count);

	return node;
}

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static inline void fw_node_put(struct fw_node *node)
{
	if (atomic_dec_and_test(&node->ref_count))
		kfree(node);
}

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void fw_core_handle_bus_reset(struct fw_card *card, int node_id,
	int generation, int self_id_count, u32 *self_ids, bool bm_abdicate);
void fw_destroy_nodes(struct fw_card *card);

/*
 * Check whether new_generation is the immediate successor of old_generation.
 * Take counter roll-over at 255 (as per OHCI) into account.
 */


static inline bool is_next_generation(int new_generation, int old_generation)
{
	return (new_generation & 0xff) == ((old_generation + 1) & 0xff);
}


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/* -transaction */


#define TCODE_LINK_INTERNAL		0xe


#define TCODE_IS_READ_REQUEST(tcode)	(((tcode) & ~1) == 4)

#define TCODE_IS_BLOCK_PACKET(tcode)	(((tcode) &  1) != 0)

#define TCODE_IS_LINK_INTERNAL(tcode)	((tcode) == TCODE_LINK_INTERNAL)

#define TCODE_IS_REQUEST(tcode)		(((tcode) &  2) == 0)

#define TCODE_IS_RESPONSE(tcode)	(((tcode) &  2) != 0)

#define TCODE_HAS_REQUEST_DATA(tcode)	(((tcode) & 12) != 4)

#define TCODE_HAS_RESPONSE_DATA(tcode)	(((tcode) & 12) != 0)


#define LOCAL_BUS 0xffc0

/* OHCI-1394's default upper bound for physical DMA: 4 GB */

#define FW_MAX_PHYSICAL_RANGE		(1ULL << 32)

void fw_core_handle_request(struct fw_card *card, struct fw_packet *request);
void fw_core_handle_response(struct fw_card *card, struct fw_packet *packet);
int fw_get_response_length(struct fw_request *request);
void fw_fill_response(struct fw_packet *response, u32 *request_header,
		      int rcode, void *payload, size_t length);


#define FW_PHY_CONFIG_NO_NODE_ID	-1

#define FW_PHY_CONFIG_CURRENT_GAP_COUNT	-1
void fw_send_phy_config(struct fw_card *card,
			int node_id, int generation, int gap_count);



static inline bool is_ping_packet(u32 *data)
{
	return (data[0] & 0xc0ffffff) == 0 && ~data[0] == data[1];
}

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#endif /* _FIREWIRE_CORE_H */
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Directory: drivers/firewire

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