diff --git a/include/asm-m68k/mac_via.h b/include/asm-m68k/mac_via.h
new file mode 100644
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+++ b/include/asm-m68k/mac_via.h
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+/*
+ *	6522 Versatile Interface Adapter (VIA)
+ *
+ *	There are two of these on the Mac II. Some IRQ's are vectored
+ *	via them as are assorted bits and bobs - eg rtc, adb. The picture
+ *	is a bit incomplete as the Mac documentation doesn't cover this well
+ */
+
+#ifndef _ASM_MAC_VIA_H_
+#define _ASM_MAC_VIA_H_
+
+/*
+ * Base addresses for the VIAs. There are two in every machine,
+ * although on some machines the second is an RBV or an OSS.
+ * The OSS is different enough that it's handled separately.
+ *
+ * Do not use these values directly; use the via1 and via2 variables
+ * instead (and don't forget to check rbv_present when using via2!)
+ */
+
+#define VIA1_BASE	(0x50F00000)
+#define VIA2_BASE	(0x50F02000)
+#define  RBV_BASE	(0x50F26000)
+
+/*
+ *	Not all of these are true post MacII I think.
+ *      CSA: probably the ones CHRP marks as 'unused' change purposes
+ *      when the IWM becomes the SWIM.
+ *      http://www.rs6000.ibm.com/resource/technology/chrpio/via5.mak.html
+ *      ftp://ftp.austin.ibm.com/pub/technology/spec/chrp/inwork/CHRP_IORef_1.0.pdf
+ *
+ * also, http://developer.apple.com/technotes/hw/hw_09.html claims the
+ * following changes for IIfx:
+ * VIA1A_vSccWrReq not available and that VIA1A_vSync has moved to an IOP.
+ * Also, "All of the functionality of VIA2 has been moved to other chips".
+ */
+
+#define VIA1A_vSccWrReq	0x80	/* SCC write. (input)
+				 * [CHRP] SCC WREQ: Reflects the state of the
+				 * Wait/Request pins from the SCC.
+				 * [Macintosh Family Hardware]
+				 * as CHRP on SE/30,II,IIx,IIcx,IIci.
+				 * on IIfx, "0 means an active request"
+				 */
+#define VIA1A_vRev8	0x40	/* Revision 8 board ???
+                                 * [CHRP] En WaitReqB: Lets the WaitReq_L
+				 * signal from port B of the SCC appear on
+				 * the PA7 input pin. Output.
+				 * [Macintosh Family] On the SE/30, this
+				 * is the bit to flip screen buffers.
+				 * 0=alternate, 1=main.
+				 * on II,IIx,IIcx,IIci,IIfx this is a bit
+				 * for Rev ID. 0=II,IIx, 1=IIcx,IIci,IIfx
+				 */
+#define VIA1A_vHeadSel	0x20	/* Head select for IWM.
+				 * [CHRP] unused.
+				 * [Macintosh Family] "Floppy disk
+				 * state-control line SEL" on all but IIfx
+				 */
+#define VIA1A_vOverlay	0x10    /* [Macintosh Family] On SE/30,II,IIx,IIcx
+				 * this bit enables the "Overlay" address
+				 * map in the address decoders as it is on
+				 * reset for mapping the ROM over the reset
+				 * vector. 1=use overlay map.
+				 * On the IIci,IIfx it is another bit of the
+				 * CPU ID: 0=normal IIci, 1=IIci with parity
+				 * feature or IIfx.
+				 * [CHRP] En WaitReqA: Lets the WaitReq_L
+				 * signal from port A of the SCC appear
+				 * on the PA7 input pin (CHRP). Output.
+				 * [MkLinux] "Drive Select"
+				 *  (with 0x20 being 'disk head select')
+				 */
+#define VIA1A_vSync	0x08    /* [CHRP] Sync Modem: modem clock select:
+                                 * 1: select the external serial clock to
+				 *    drive the SCC's /RTxCA pin.
+				 * 0: Select the 3.6864MHz clock to drive
+				 *    the SCC cell.
+				 * [Macintosh Family] Correct on all but IIfx
+				 */
+
+/* Macintosh Family Hardware sez: bits 0-2 of VIA1A are volume control
+ * on Macs which had the PWM sound hardware.  Reserved on newer models.
+ * On IIci,IIfx, bits 1-2 are the rest of the CPU ID:
+ * bit 2: 1=IIci, 0=IIfx
+ * bit 1: 1 on both IIci and IIfx.
+ * MkLinux sez bit 0 is 'burnin flag' in this case.
+ * CHRP sez: VIA1A bits 0-2 and 5 are 'unused': if programmed as
+ * inputs, these bits will read 0.
+ */
+#define VIA1A_vVolume	0x07	/* Audio volume mask for PWM */
+#define VIA1A_CPUID0	0x02	/* CPU id bit 0 on RBV, others */
+#define VIA1A_CPUID1	0x04	/* CPU id bit 0 on RBV, others */
+#define VIA1A_CPUID2	0x10	/* CPU id bit 0 on RBV, others */
+#define VIA1A_CPUID3	0x40	/* CPU id bit 0 on RBV, others */
+
+/* Info on VIA1B is from Macintosh Family Hardware & MkLinux.
+ * CHRP offers no info. */
+#define VIA1B_vSound	0x80	/* Sound enable (for compatibility with
+				 * PWM hardware) 0=enabled.
+				 * Also, on IIci w/parity, shows parity error
+				 * 0=error, 1=OK. */
+#define VIA1B_vMystery	0x40    /* On IIci, parity enable. 0=enabled,1=disabled
+				 * On SE/30, vertical sync interrupt enable.
+				 * 0=enabled. This vSync interrupt shows up
+				 * as a slot $E interrupt. */
+#define VIA1B_vADBS2	0x20	/* ADB state input bit 1 (unused on IIfx) */
+#define VIA1B_vADBS1	0x10	/* ADB state input bit 0 (unused on IIfx) */
+#define VIA1B_vADBInt	0x08	/* ADB interrupt 0=interrupt (unused on IIfx)*/
+#define VIA1B_vRTCEnb	0x04	/* Enable Real time clock. 0=enabled. */
+#define VIA1B_vRTCClk	0x02    /* Real time clock serial-clock line. */
+#define VIA1B_vRTCData	0x01    /* Real time clock serial-data line. */
+
+/* MkLinux defines the following "VIA1 Register B contents where they
+ * differ from standard VIA1".  From the naming scheme, we assume they
+ * correspond to a VIA work-alike named 'EVR'. */
+#define	EVRB_XCVR	0x08	/* XCVR_SESSION* */
+#define	EVRB_FULL	0x10	/* VIA_FULL */
+#define	EVRB_SYSES	0x20	/* SYS_SESSION */
+#define	EVRB_AUXIE	0x00	/* Enable A/UX Interrupt Scheme */
+#define	EVRB_AUXID	0x40	/* Disable A/UX Interrupt Scheme */
+#define	EVRB_SFTWRIE	0x00	/* Software Interrupt ReQuest */
+#define	EVRB_SFTWRID	0x80	/* Software Interrupt ReQuest */
+
+/*
+ *	VIA2 A register is the interrupt lines raised off the nubus
+ *	slots.
+ *      The below info is from 'Macintosh Family Hardware.'
+ *      MkLinux calls the 'IIci internal video IRQ' below the 'RBV slot 0 irq.'
+ *      It also notes that the slot $9 IRQ is the 'Ethernet IRQ' and
+ *      defines the 'Video IRQ' as 0x40 for the 'EVR' VIA work-alike.
+ *      Perhaps OSS uses vRAM1 and vRAM2 for ADB.
+ */
+
+#define VIA2A_vRAM1	0x80	/* RAM size bit 1 (IIci: reserved) */
+#define VIA2A_vRAM0	0x40	/* RAM size bit 0 (IIci: internal video IRQ) */
+#define VIA2A_vIRQE	0x20	/* IRQ from slot $E */
+#define VIA2A_vIRQD	0x10	/* IRQ from slot $D */
+#define VIA2A_vIRQC	0x08	/* IRQ from slot $C */
+#define VIA2A_vIRQB	0x04	/* IRQ from slot $B */
+#define VIA2A_vIRQA	0x02	/* IRQ from slot $A */
+#define VIA2A_vIRQ9	0x01	/* IRQ from slot $9 */
+
+/* RAM size bits decoded as follows:
+ * bit1 bit0  size of ICs in bank A
+ *  0    0    256 kbit
+ *  0    1    1 Mbit
+ *  1    0    4 Mbit
+ *  1    1   16 Mbit
+ */
+
+/*
+ *	Register B has the fun stuff in it
+ */
+
+#define VIA2B_vVBL	0x80	/* VBL output to VIA1 (60.15Hz) driven by
+				 * timer T1.
+				 * on IIci, parity test: 0=test mode.
+				 * [MkLinux] RBV_PARODD: 1=odd,0=even. */
+#define VIA2B_vSndJck	0x40	/* External sound jack status.
+				 * 0=plug is inserted.  On SE/30, always 0 */
+#define VIA2B_vTfr0	0x20	/* Transfer mode bit 0 ack from NuBus */
+#define VIA2B_vTfr1	0x10	/* Transfer mode bit 1 ack from NuBus */
+#define VIA2B_vMode32	0x08	/* 24/32bit switch - doubles as cache flush
+				 * on II, AMU/PMMU control.
+				 *   if AMU, 0=24bit to 32bit translation
+				 *   if PMMU, 1=PMMU is accessing page table.
+				 * on SE/30 tied low.
+				 * on IIx,IIcx,IIfx, unused.
+				 * on IIci/RBV, cache control. 0=flush cache.
+				 */
+#define VIA2B_vPower	0x04	/* Power off, 0=shut off power.
+				 * on SE/30 this signal sent to PDS card. */
+#define VIA2B_vBusLk	0x02	/* Lock NuBus transactions, 0=locked.
+				 * on SE/30 sent to PDS card. */
+#define VIA2B_vCDis	0x01	/* Cache control. On IIci, 1=disable cache card
+				 * on others, 0=disable processor's instruction
+				 * and data caches. */
+
+/* Apple sez: http://developer.apple.com/technotes/ov/ov_04.html
+ * Another example of a valid function that has no ROM support is the use
+ * of the alternate video page for page-flipping animation. Since there
+ * is no ROM call to flip pages, it is necessary to go play with the
+ * right bit in the VIA chip (6522 Versatile Interface Adapter).
+ * [CSA: don't know which one this is, but it's one of 'em!]
+ */
+
+/*
+ *	6522 registers - see databook.
+ * CSA: Assignments for VIA1 confirmed from CHRP spec.
+ */
+
+/* partial address decode.  0xYYXX : XX part for RBV, YY part for VIA */
+/* Note: 15 VIA regs, 8 RBV regs */
+
+#define vBufB	0x0000	/* [VIA/RBV]  Register B */
+#define vBufAH	0x0200  /* [VIA only] Buffer A, with handshake. DON'T USE! */
+#define vDirB	0x0400  /* [VIA only] Data Direction Register B. */
+#define vDirA	0x0600  /* [VIA only] Data Direction Register A. */
+#define vT1CL	0x0800  /* [VIA only] Timer one counter low. */
+#define vT1CH	0x0a00  /* [VIA only] Timer one counter high. */
+#define vT1LL	0x0c00  /* [VIA only] Timer one latches low. */
+#define vT1LH	0x0e00  /* [VIA only] Timer one latches high. */
+#define vT2CL	0x1000  /* [VIA only] Timer two counter low. */
+#define vT2CH	0x1200  /* [VIA only] Timer two counter high. */
+#define vSR	0x1400  /* [VIA only] Shift register. */
+#define vACR	0x1600  /* [VIA only] Auxilary control register. */
+#define vPCR	0x1800  /* [VIA only] Peripheral control register. */
+                        /*            CHRP sez never ever to *write* this.
+			 *            Mac family says never to *change* this.
+			 * In fact we need to initialize it once at start. */
+#define vIFR	0x1a00  /* [VIA/RBV]  Interrupt flag register. */
+#define vIER	0x1c00  /* [VIA/RBV]  Interrupt enable register. */
+#define vBufA	0x1e00  /* [VIA/RBV] register A (no handshake) */
+
+/* The RBV only decodes the bottom eight address lines; the VIA doesn't
+ * decode the bottom eight -- so vBufB | rBufB will always get you BufB */
+/* CSA: in fact, only bits 0,1, and 4 seem to be decoded.
+ * BUT note the values for rIER and rIFR, where the top 8 bits *do* seem
+ * to matter.  In fact *all* of the top 8 bits seem to matter;
+ * setting rIER=0x1813 and rIFR=0x1803 doesn't work, either.
+ * Perhaps some sort of 'compatibility mode' is built-in? [21-May-1999]
+ */
+
+#define rBufB   0x0000  /* [VIA/RBV]  Register B */
+#define rExp	0x0001	/* [RBV only] RBV future expansion (always 0) */
+#define rSIFR	0x0002  /* [RBV only] RBV slot interrupts register. */
+#define rIFR	0x1a03  /* [VIA/RBV]  RBV interrupt flag register. */
+#define rMonP   0x0010  /* [RBV only] RBV video monitor type. */
+#define rChpT   0x0011  /* [RBV only] RBV test mode register (reads as 0). */
+#define rSIER   0x0012  /* [RBV only] RBV slot interrupt enables. */
+#define rIER    0x1c13  /* [VIA/RBV]  RBV interrupt flag enable register. */
+#define rBufA	rSIFR   /* the 'slot interrupts register' is BufA on a VIA */
+
+/*
+ * Video monitor parameters, for rMonP:
+ */
+#define RBV_DEPTH  0x07	/* bits per pixel: 000=1,001=2,010=4,011=8 */
+#define RBV_MONID  0x38	/* monitor type, as below. */
+#define RBV_VIDOFF 0x40	/* 1 turns off onboard video */
+/* Supported monitor types: */
+#define MON_15BW   (1<<3) /* 15" BW portrait. */
+#define MON_IIGS   (2<<3) /* 12" color (modified IIGS monitor). */
+#define MON_15RGB  (5<<3) /* 15" RGB portrait. */
+#define MON_12OR13 (6<<3) /* 12" BW or 13" RGB. */
+#define MON_NONE   (7<<3) /* No monitor attached. */
+
+/* To clarify IER manipulations */
+#define IER_SET_BIT(b) (0x80 | (1<<(b)) )
+#define IER_CLR_BIT(b) (0x7F & (1<<(b)) )
+
+#ifndef __ASSEMBLY__
+
+extern volatile __u8 *via1,*via2;
+extern int rbv_present,via_alt_mapping;
+extern __u8 rbv_clear;
+
+static inline int rbv_set_video_bpp(int bpp)
+{
+	char val = (bpp==1)?0:(bpp==2)?1:(bpp==4)?2:(bpp==8)?3:-1;
+	if (!rbv_present || val<0) return -1;
+	via2[rMonP] = (via2[rMonP] & ~RBV_DEPTH) | val;
+	return 0;
+}
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* _ASM_MAC_VIA_H_ */