#ifndef IEEE1394_HIGHLEVEL_H
#define IEEE1394_HIGHLEVEL_H


struct hpsb_highlevel {
        struct list_head hl_list;

        /* List of hpsb_address_serve. */
        struct list_head addr_list;

        const char *name;
        struct hpsb_highlevel_ops *op;
};


struct hpsb_address_serve {
        struct list_head as_list; /* global list */
        
        struct list_head addr_list; /* hpsb_highlevel list */

        struct hpsb_address_ops *op;

        /* first address handled and first address behind, quadlet aligned */
        u64 start, end;
};


/*
 * The above structs are internal to highlevel driver handling.  Only the
 * following structures are of interest to actual highlevel drivers.  
 */

struct hpsb_highlevel_ops {
        /* Any of the following pointers can legally be NULL, except for
         * iso_receive which can only be NULL when you don't request
         * channels. */

        /* New host initialized.  Will also be called during
         * hpsb_register_highlevel for all hosts already installed. */
        void (*add_host) (struct hpsb_host *host);

        /* Host about to be removed.  Will also be called during
         * hpsb_unregister_highlevel once for each host. */
        void (*remove_host) (struct hpsb_host *host);

        /* Host experienced bus reset with possible configuration changes.  Note
         * that this one may occur during interrupt/bottom half handling.  You
         * can not expect to be able to do stock hpsb_reads. */
        void (*host_reset) (struct hpsb_host *host);

        /* An isochronous packet was received.  Channel contains the channel
         * number for your convenience, it is also contained in the included
         * packet header (first quadlet, CRCs are missing).  You may get called
         * for channel/host combinations you did not request. */
        void (*iso_receive) (struct hpsb_host *host, int channel,
                             quadlet_t *data, unsigned int length);

        /* A write request was received on either the FCP_COMMAND (direction =
         * 0) or the FCP_RESPONSE (direction = 1) register.  The cts arg
         * contains the cts field (first byte of data).
         */
        void (*fcp_request) (struct hpsb_host *host, int nodeid, int direction,
                             int cts, u8 *data, unsigned int length);
};

struct hpsb_address_ops {
        /*
         * Null function pointers will make the respective operation complete 
         * with RCODE_TYPE_ERROR.  Makes for easy to implement read-only 
         * registers (just leave everything but read NULL).
         *
         * All functions shall return appropriate IEEE 1394 rcodes.
         */

        /* These functions have to implement block reads for themselves. */
        /* These functions either return a response code
           or a negative number. In the first case a response will be generated; in the 
           later case, no response will be sent and the driver, that handled the request
           will send the response itself
        */
        int (*read) (struct hpsb_host *host, int nodeid, quadlet_t *buffer,
                     u64 addr, unsigned int length, u16 flags);
        int (*write) (struct hpsb_host *host, int nodeid, int destid,
		      quadlet_t *data, u64 addr, unsigned int length, u16 flags);

        /* Lock transactions: write results of ext_tcode operation into
         * *store. */
        int (*lock) (struct hpsb_host *host, int nodeid, quadlet_t *store,
                     u64 addr, quadlet_t data, quadlet_t arg, int ext_tcode, u16 flags);
        int (*lock64) (struct hpsb_host *host, int nodeid, octlet_t *store,
                       u64 addr, octlet_t data, octlet_t arg, int ext_tcode, u16 flags);
};


void init_hpsb_highlevel(void);

void highlevel_add_host(struct hpsb_host *host);
void highlevel_remove_host(struct hpsb_host *host);
void highlevel_host_reset(struct hpsb_host *host);


/* these functions are called to handle transactions. They are called, when
   a packet arrives. The flags argument contains the second word of the first header
   quadlet of the incoming packet (containing transaction label, retry code,
   transaction code and priority). These functions either return a response code
   or a negative number. In the first case a response will be generated; in the 
   later case, no response will be sent and the driver, that handled the request
   will send the response itself.
*/
int highlevel_read(struct hpsb_host *host, int nodeid, quadlet_t *buffer,
                   u64 addr, unsigned int length, u16 flags);
int highlevel_write(struct hpsb_host *host, int nodeid, int destid,
		    quadlet_t *data, u64 addr, unsigned int length, u16 flags);
int highlevel_lock(struct hpsb_host *host, int nodeid, quadlet_t *store,
                   u64 addr, quadlet_t data, quadlet_t arg, int ext_tcode, u16 flags);
int highlevel_lock64(struct hpsb_host *host, int nodeid, octlet_t *store,
                     u64 addr, octlet_t data, octlet_t arg, int ext_tcode, u16 flags);

void highlevel_iso_receive(struct hpsb_host *host, quadlet_t *data,
                           unsigned int length);
void highlevel_fcp_request(struct hpsb_host *host, int nodeid, int direction,
                           u8 *data, unsigned int length);


/*
 * Register highlevel driver.  The name pointer has to stay valid at all times
 * because the string is not copied.
 */
struct hpsb_highlevel *hpsb_register_highlevel(const char *name,
                                               struct hpsb_highlevel_ops *ops);
void hpsb_unregister_highlevel(struct hpsb_highlevel *hl);

/*
 * Register handlers for host address spaces.  Start and end are 48 bit pointers
 * and have to be quadlet aligned (end points to the first address behind the
 * handled addresses.  This function can be called multiple times for a single
 * hpsb_highlevel to implement sparse register sets.  The requested region must
 * not overlap any previously allocated region, otherwise registering will fail.
 *
 * It returns true for successful allocation.  There is no unregister function,
 * all address spaces are deallocated together with the hpsb_highlevel.
 */
int hpsb_register_addrspace(struct hpsb_highlevel *hl,
                            struct hpsb_address_ops *ops, u64 start, u64 end);

int hpsb_unregister_addrspace(struct hpsb_highlevel *hl, u64 start);

/*
 * Enable or disable receving a certain isochronous channel through the
 * iso_receive op.
 */
void hpsb_listen_channel(struct hpsb_highlevel *hl, struct hpsb_host *host, 
                         unsigned int channel);
void hpsb_unlisten_channel(struct hpsb_highlevel *hl, struct hpsb_host *host,
                           unsigned int channel);

#endif /* IEEE1394_HIGHLEVEL_H */