core.h

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#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_bus_reset(struct fw_card *card, bool delayed, bool short_reset);
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;
}

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

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;
}

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

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);
}


/* -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

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];
}

#endif /* _FIREWIRE_CORE_H */