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root/include/asm-m68k/mac_iop.h

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/*
 * I/O Processor (IOP) defines and structures, mostly snagged from A/UX
 * header files.
 *
 * The original header from which this was taken is copyrighted. I've done some
 * rewriting (in fact my changes make this a bit more readable, IMHO) but some
 * more should be done.
 */

/*
 * This is the base address of the IOPs. Use this as the address of
 * a "struct iop" (see below) to see where the actual registers fall.
 */

#define SCC_IOP_BASE_IIFX       (0x50F04000)
#define ISM_IOP_BASE_IIFX       (0x50F12000)

#define SCC_IOP_BASE_QUADRA     (0x50F0C000)
#define ISM_IOP_BASE_QUADRA     (0x50F1E000)

/* IOP status/control register bits: */

#define IOP_BYPASS      0x01    /* bypass-mode hardware access */
#define IOP_AUTOINC     0x02    /* allow autoincrement of ramhi/lo */
#define IOP_RUN         0x04    /* set to 0 to reset IOP chip */
#define IOP_IRQ         0x08    /* generate IRQ to IOP if 1 */
#define IOP_INT0        0x10    /* intr priority from IOP to host */
#define IOP_INT1        0x20    /* intr priority from IOP to host */
#define IOP_HWINT       0x40    /* IRQ from hardware; bypass mode only */
#define IOP_DMAINACTIVE 0x80    /* no DMA request active; bypass mode only */

#define NUM_IOPS        2
#define NUM_IOP_CHAN    7
#define NUM_IOP_MSGS    NUM_IOP_CHAN*8
#define IOP_MSG_LEN     32

/* IOP reference numbers, used by the globally-visible iop_xxx functions */

#define IOP_NUM_SCC     0
#define IOP_NUM_ISM     1

/* IOP channel states */

#define IOP_MSG_IDLE            0       /* idle                         */
#define IOP_MSG_NEW             1       /* new message sent             */
#define IOP_MSG_RCVD            2       /* message received; processing */
#define IOP_MSG_COMPLETE        3       /* message processing complete  */

/* IOP message status codes */

#define IOP_MSGSTATUS_UNUSED    0       /* Unusued message structure       */
#define IOP_MSGSTATUS_WAITING   1       /* waiting for channel             */
#define IOP_MSGSTATUS_SENT      2       /* message sent, awaiting reply    */
#define IOP_MSGSTATUS_COMPLETE  3       /* message complete and reply rcvd */
#define IOP_MSGSTATUS_UNSOL     6       /* message is unsolicited          */

/* IOP memory addresses of the members of the mac_iop_kernel structure. */

#define IOP_ADDR_MAX_SEND_CHAN  0x0200
#define IOP_ADDR_SEND_STATE     0x0201
#define IOP_ADDR_PATCH_CTRL     0x021F
#define IOP_ADDR_SEND_MSG       0x0220
#define IOP_ADDR_MAX_RECV_CHAN  0x0300
#define IOP_ADDR_RECV_STATE     0x0301
#define IOP_ADDR_ALIVE          0x031F
#define IOP_ADDR_RECV_MSG       0x0320

#ifndef __ASSEMBLY__

/*
 * IOP Control registers, staggered because in usual Apple style they were
 * too lazy to decode the A0 bit. This structure is assumed to begin at
 * one of the xxx_IOP_BASE addresses given above.
 */

struct mac_iop {
    __u8        ram_addr_hi;    /* shared RAM address hi byte */
    __u8        pad0;
    __u8        ram_addr_lo;    /* shared RAM address lo byte */
    __u8        pad1;
    __u8        status_ctrl;    /* status/control register */
    __u8        pad2[3];
    __u8        ram_data;       /* RAM data byte at ramhi/lo */

    __u8        pad3[23];

    /* Bypass-mode hardware access registers */

    union {
        struct {                /* SCC registers */
            __u8 sccb_cmd;      /* SCC B command reg */
            __u8 pad4;
            __u8 scca_cmd;      /* SCC A command reg */
            __u8 pad5;
            __u8 sccb_data;     /* SCC B data */
            __u8 pad6;
            __u8 scca_data;     /* SCC A data */
        } scc_regs;

        struct {                /* ISM registers */
            __u8 wdata;         /* write a data byte */
            __u8 pad7;
            __u8 wmark;         /* write a mark byte */
            __u8 pad8;
            __u8 wcrc;          /* write 2-byte crc to disk */
            __u8 pad9;
            __u8 wparams;       /* write the param regs */
            __u8 pad10;
            __u8 wphase;        /* write the phase states & dirs */
            __u8 pad11;
            __u8 wsetup;        /* write the setup register */
            __u8 pad12;
            __u8 wzeroes;       /* mode reg: 1's clr bits, 0's are x */
            __u8 pad13;
            __u8 wones;         /* mode reg: 1's set bits, 0's are x */
            __u8 pad14;
            __u8 rdata;         /* read a data byte */
            __u8 pad15;
            __u8 rmark;         /* read a mark byte */
            __u8 pad16;
            __u8 rerror;        /* read the error register */
            __u8 pad17;
            __u8 rparams;       /* read the param regs */
            __u8 pad18;
            __u8 rphase;        /* read the phase states & dirs */
            __u8 pad19;
            __u8 rsetup;        /* read the setup register */
            __u8 pad20;
            __u8 rmode;         /* read the mode register */
            __u8 pad21;
            __u8 rhandshake;    /* read the handshake register */
        } ism_regs;
    } b;
};

/* This structure is used to track IOP messages in the Linux kernel */

struct iop_msg {
        struct iop_msg  *next;          /* next message in queue or NULL     */
        uint    iop_num;                /* IOP number                        */
        uint    channel;                /* channel number                    */
        void    *caller_priv;           /* caller private data               */
        int     status;                 /* status of this message            */
        __u8    message[IOP_MSG_LEN];   /* the message being sent/received   */
        __u8    reply[IOP_MSG_LEN];     /* the reply to the message          */
        void    (*handler)(struct iop_msg *);
                                        /* function to call when reply recvd */
};

extern int iop_scc_present,iop_ism_present;

extern int iop_listen(uint, uint,
                        void (*handler)(struct iop_msg *),
                        const char *);
extern int iop_send_message(uint, uint, void *, uint, __u8 *,
                            void (*)(struct iop_msg *));
extern void iop_complete_message(struct iop_msg *);
extern void iop_upload_code(uint, __u8 *, uint, __u16);
extern void iop_download_code(uint, __u8 *, uint, __u16);
extern __u8 *iop_compare_code(uint, __u8 *, uint, __u16);

#endif /* __ASSEMBLY__ */

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