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diff --git a/include/asm-m68k/mac_iop.h b/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 *, struct pt_regs *);
+ /* 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 *, struct pt_regs *),
+ const char *);
+extern int iop_send_message(uint, uint, void *, uint, __u8 *,
+ void (*)(struct iop_msg *, struct pt_regs *));
+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__ */