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diff --git a/include/asm-sparc/io-unit.h b/include/asm-sparc/io-unit.h
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+/* io-unit.h: Definitions for the sun4d IO-UNIT.
+ *
+ * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
+ */
+#ifndef _SPARC_IO_UNIT_H
+#define _SPARC_IO_UNIT_H
+
+#include <linux/spinlock.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+
+/* The io-unit handles all virtual to physical address translations
+ * that occur between the SBUS and physical memory. Access by
+ * the cpu to IO registers and similar go over the xdbus so are
+ * translated by the on chip SRMMU. The io-unit and the srmmu do
+ * not need to have the same translations at all, in fact most
+ * of the time the translations they handle are a disjunct set.
+ * Basically the io-unit handles all dvma sbus activity.
+ */
+
+/* AIEEE, unlike the nice sun4m, these monsters have
+ fixed DMA range 64M */
+
+#define IOUNIT_DMA_BASE 0xfc000000 /* TOP - 64M */
+#define IOUNIT_DMA_SIZE 0x04000000 /* 64M */
+/* We use last 1M for sparc_dvma_malloc */
+#define IOUNIT_DVMA_SIZE 0x00100000 /* 1M */
+
+/* The format of an iopte in the external page tables */
+#define IOUPTE_PAGE 0xffffff00 /* Physical page number (PA[35:12]) */
+#define IOUPTE_CACHE 0x00000080 /* Cached (in Viking/MXCC) */
+/* XXX Jakub, find out how to program SBUS streaming cache on XDBUS/sun4d.
+ * XXX Actually, all you should need to do is find out where the registers
+ * XXX are and copy over the sparc64 implementation I wrote. There may be
+ * XXX some horrible hwbugs though, so be careful. -DaveM
+ */
+#define IOUPTE_STREAM 0x00000040 /* Translation can use streaming cache */
+#define IOUPTE_INTRA 0x00000008 /* SBUS direct slot->slot transfer */
+#define IOUPTE_WRITE 0x00000004 /* Writeable */
+#define IOUPTE_VALID 0x00000002 /* IOPTE is valid */
+#define IOUPTE_PARITY 0x00000001 /* Parity is checked during DVMA */
+
+struct iounit_struct {
+ unsigned long bmap[(IOUNIT_DMA_SIZE >> (PAGE_SHIFT + 3)) / sizeof(unsigned long)];
+ spinlock_t lock;
+ iopte_t *page_table;
+ unsigned long rotor[3];
+ unsigned long limit[4];
+};
+
+#define IOUNIT_BMAP1_START 0x00000000
+#define IOUNIT_BMAP1_END (IOUNIT_DMA_SIZE >> (PAGE_SHIFT + 1))
+#define IOUNIT_BMAP2_START IOUNIT_BMAP1_END
+#define IOUNIT_BMAP2_END IOUNIT_BMAP2_START + (IOUNIT_DMA_SIZE >> (PAGE_SHIFT + 2))
+#define IOUNIT_BMAPM_START IOUNIT_BMAP2_END
+#define IOUNIT_BMAPM_END ((IOUNIT_DMA_SIZE - IOUNIT_DVMA_SIZE) >> PAGE_SHIFT)
+
+extern __u32 iounit_map_dma_init(struct sbus_bus *, int);
+#define iounit_map_dma_finish(sbus, addr, len) mmu_release_scsi_one(addr, len, sbus)
+extern __u32 iounit_map_dma_page(__u32, void *, struct sbus_bus *);
+
+#endif /* !(_SPARC_IO_UNIT_H) */