diff --git a/drivers/dio/dio.c b/drivers/dio/dio.c
new file mode 100644
index 0000000..a620f7d
--- /dev/null
+++ b/drivers/dio/dio.c
@@ -0,0 +1,279 @@
+/* Code to support devices on the DIO and DIO-II bus
+ * Copyright (C) 05/1998 Peter Maydell <pmaydell@chiark.greenend.org.uk>
+ * Copyright (C) 2004 Jochen Friedrich <jochen@scram.de>
+ * 
+ * This code has basically these routines at the moment:
+ * int dio_find(u_int deviceid)
+ *    Search the list of DIO devices and return the select code
+ *    of the next unconfigured device found that matches the given device ID.
+ *    Note that the deviceid parameter should be the encoded ID.
+ *    This means that framebuffers should pass it as 
+ *    DIO_ENCODE_ID(DIO_ID_FBUFFER,DIO_ID2_TOPCAT)
+ *    (or whatever); everybody else just uses DIO_ID_FOOBAR.
+ * unsigned long dio_scodetophysaddr(int scode)
+ *    Return the physical address corresponding to the given select code.
+ * int dio_scodetoipl(int scode)
+ *    Every DIO card has a fixed interrupt priority level. This function 
+ *    returns it, whatever it is.
+ * const char *dio_scodetoname(int scode)
+ *    Return a character string describing this board [might be "" if 
+ *    not CONFIG_DIO_CONSTANTS]
+ * void dio_config_board(int scode)     mark board as configured in the list
+ * void dio_unconfig_board(int scode)   mark board as no longer configured
+ *
+ * This file is based on the way the Amiga port handles Zorro II cards, 
+ * although we aren't so complicated...
+ */
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/dio.h>
+#include <linux/slab.h>                         /* kmalloc() */
+#include <asm/uaccess.h>
+#include <asm/io.h>                             /* readb() */
+
+struct dio_bus dio_bus = {
+	.resources = {
+		/* DIO range */
+		{ .name = "DIO mem", .start = 0x00600000, .end = 0x007fffff },
+		/* DIO-II range */
+		{ .name = "DIO-II mem", .start = 0x01000000, .end = 0x1fffffff }
+	},
+	.name = "DIO bus"
+};
+
+/* not a real config option yet! */
+#define CONFIG_DIO_CONSTANTS
+
+#ifdef CONFIG_DIO_CONSTANTS
+/* We associate each numeric ID with an appropriate descriptive string
+ * using a constant array of these structs.
+ * FIXME: we should be able to arrange to throw away most of the strings
+ * using the initdata stuff. Then we wouldn't need to worry about 
+ * carrying them around...
+ * I think we do this by copying them into newly kmalloc()ed memory and 
+ * marking the names[] array as .initdata ?
+ */
+struct dioname
+{
+        int id;
+        const char *name;
+};
+
+/* useful macro */
+#define DIONAME(x) { DIO_ID_##x, DIO_DESC_##x }
+#define DIOFBNAME(x) { DIO_ENCODE_ID( DIO_ID_FBUFFER, DIO_ID2_##x), DIO_DESC2_##x }
+
+static struct dioname names[] = 
+{
+        DIONAME(DCA0), DIONAME(DCA0REM), DIONAME(DCA1), DIONAME(DCA1REM),
+        DIONAME(DCM), DIONAME(DCMREM),
+        DIONAME(LAN),
+        DIONAME(FHPIB), DIONAME(NHPIB),
+        DIONAME(SCSI0), DIONAME(SCSI1), DIONAME(SCSI2), DIONAME(SCSI3),
+        DIONAME(FBUFFER),
+        DIONAME(PARALLEL), DIONAME(VME), DIONAME(DCL), DIONAME(DCLREM),
+        DIONAME(MISC0), DIONAME(MISC1), DIONAME(MISC2), DIONAME(MISC3),
+        DIONAME(MISC4), DIONAME(MISC5), DIONAME(MISC6), DIONAME(MISC7),
+        DIONAME(MISC8), DIONAME(MISC9), DIONAME(MISC10), DIONAME(MISC11), 
+        DIONAME(MISC12), DIONAME(MISC13),
+        DIOFBNAME(GATORBOX), DIOFBNAME(TOPCAT), DIOFBNAME(RENAISSANCE),
+        DIOFBNAME(LRCATSEYE), DIOFBNAME(HRCCATSEYE), DIOFBNAME(HRMCATSEYE),
+        DIOFBNAME(DAVINCI), DIOFBNAME(XXXCATSEYE), DIOFBNAME(HYPERION),
+        DIOFBNAME(XGENESIS), DIOFBNAME(TIGER), DIOFBNAME(YGENESIS)   
+};
+
+#undef DIONAME
+#undef DIOFBNAME
+
+#define NUMNAMES (sizeof(names) / sizeof(struct dioname))
+
+static const char *unknowndioname 
+        = "unknown DIO board -- please email <linux-m68k@lists.linux-m68k.org>!";
+
+static const char *dio_getname(int id)
+{
+        /* return pointer to a constant string describing the board with given ID */
+	unsigned int i;
+        for (i = 0; i < NUMNAMES; i++)
+                if (names[i].id == id) 
+                        return names[i].name;
+
+        return unknowndioname;
+}
+
+#else
+
+static char dio_no_name[] = { 0 };
+#define dio_getname(_id)	(dio_no_name)
+
+#endif /* CONFIG_DIO_CONSTANTS */
+
+int __init dio_find(int deviceid)
+{
+	/* Called to find a DIO device before the full bus scan has run.
+	 * Only used by the console driver.
+	 */
+	int scode, id;
+	u_char prid, secid, i;
+	mm_segment_t fs;
+
+	for (scode = 0; scode < DIO_SCMAX; scode++) {
+		void *va;
+		unsigned long pa;
+
+                if (DIO_SCINHOLE(scode))
+                        continue;
+
+                pa = dio_scodetophysaddr(scode);
+
+		if (!pa)
+			continue;
+
+		if (scode < DIOII_SCBASE)
+			va = (void *)(pa + DIO_VIRADDRBASE);
+		else
+			va = ioremap(pa, PAGE_SIZE);
+
+		fs = get_fs();
+		set_fs(KERNEL_DS);
+
+                if (get_user(i, (unsigned char *)va + DIO_IDOFF)) {
+			set_fs(fs);
+			if (scode >= DIOII_SCBASE)
+				iounmap(va);
+                        continue;             /* no board present at that select code */
+		}
+
+		set_fs(fs);
+		prid = DIO_ID(va);
+
+                if (DIO_NEEDSSECID(prid)) {
+                        secid = DIO_SECID(va);
+                        id = DIO_ENCODE_ID(prid, secid);
+                } else
+			id = prid;
+
+		if (id == deviceid) {
+			if (scode >= DIOII_SCBASE)
+				iounmap(va);
+			return scode;
+		}
+	}
+
+	return -1;
+}
+
+/* This is the function that scans the DIO space and works out what
+ * hardware is actually present.
+ */
+static int __init dio_init(void)
+{
+	int scode;
+	mm_segment_t fs;
+	int i;
+	struct dio_dev *dev;
+
+	if (!MACH_IS_HP300)
+		return 0;
+
+        printk(KERN_INFO "Scanning for DIO devices...\n");
+
+	/* Initialize the DIO bus */ 
+	INIT_LIST_HEAD(&dio_bus.devices);
+	strcpy(dio_bus.dev.bus_id, "dio");
+	device_register(&dio_bus.dev);
+
+	/* Request all resources */
+	dio_bus.num_resources = (hp300_model == HP_320 ? 1 : 2);
+	for (i = 0; i < dio_bus.num_resources; i++)
+		request_resource(&iomem_resource, &dio_bus.resources[i]);
+
+	/* Register all devices */
+        for (scode = 0; scode < DIO_SCMAX; ++scode)
+        {
+                u_char prid, secid = 0;        /* primary, secondary ID bytes */
+                u_char *va;
+		unsigned long pa;
+                
+                if (DIO_SCINHOLE(scode))
+                        continue;
+
+		pa = dio_scodetophysaddr(scode);
+
+		if (!pa)
+			continue;
+
+		if (scode < DIOII_SCBASE)
+			va = (void *)(pa + DIO_VIRADDRBASE);
+		else
+			va = ioremap(pa, PAGE_SIZE);
+
+		fs = get_fs();
+		set_fs(KERNEL_DS);
+
+                if (get_user(i, (unsigned char *)va + DIO_IDOFF)) {
+			set_fs(fs);
+			if (scode >= DIOII_SCBASE)
+				iounmap(va);
+                        continue;              /* no board present at that select code */
+		}
+
+		set_fs(fs);
+
+                /* Found a board, allocate it an entry in the list */
+		dev = kmalloc(sizeof(struct dio_dev), GFP_KERNEL);
+		if (!dev)
+			return 0;
+
+		memset(dev, 0, sizeof(struct dio_dev));
+		dev->bus = &dio_bus;
+		dev->dev.parent = &dio_bus.dev;
+		dev->dev.bus = &dio_bus_type;
+		dev->scode = scode;
+		dev->resource.start = pa;
+		dev->resource.end = pa + DIO_SIZE(scode, va);
+		sprintf(dev->dev.bus_id,"%02x", scode);
+
+                /* read the ID byte(s) and encode if necessary. */
+		prid = DIO_ID(va);
+
+                if (DIO_NEEDSSECID(prid)) {
+                        secid = DIO_SECID(va);
+                        dev->id = DIO_ENCODE_ID(prid, secid);
+                } else
+                        dev->id = prid;
+
+                dev->ipl = DIO_IPL(va);
+                strcpy(dev->name,dio_getname(dev->id));
+                printk(KERN_INFO "select code %3d: ipl %d: ID %02X", dev->scode, dev->ipl, prid);
+                if (DIO_NEEDSSECID(prid))
+                        printk(":%02X", secid);
+                printk(": %s\n", dev->name);
+
+		if (scode >= DIOII_SCBASE)
+			iounmap(va);
+		device_register(&dev->dev);
+		dio_create_sysfs_dev_files(dev);
+        }
+	return 0;
+}
+
+subsys_initcall(dio_init);
+
+/* Bear in mind that this is called in the very early stages of initialisation
+ * in order to get the address of the serial port for the console...
+ */
+unsigned long dio_scodetophysaddr(int scode)
+{
+        if (scode >= DIOII_SCBASE) {
+                return (DIOII_BASE + (scode - 132) * DIOII_DEVSIZE);
+        } else if (scode > DIO_SCMAX || scode < 0)
+                return 0;
+        else if (DIO_SCINHOLE(scode))
+                return 0;
+
+        return (DIO_BASE + scode * DIO_DEVSIZE);
+}