Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 1243 insertions, 0 deletions

diff --git a/arch/sparc64/kernel/sbus.c b/arch/sparc64/kernel/sbus.c
new file mode 100644
index 000000000000..14d9c3a21b9a
--- /dev/null
+++ b/arch/sparc64/kernel/sbus.c
@@ -0,0 +1,1243 @@
+/* $Id: sbus.c,v 1.19 2002/01/23 11:27:32 davem Exp $
+ * sbus.c: UltraSparc SBUS controller support.
+ *
+ * Copyright (C) 1999 David S. Miller (davem@redhat.com)
+ */
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+
+#include <asm/page.h>
+#include <asm/sbus.h>
+#include <asm/io.h>
+#include <asm/upa.h>
+#include <asm/cache.h>
+#include <asm/dma.h>
+#include <asm/irq.h>
+#include <asm/starfire.h>
+
+#include "iommu_common.h"
+
+/* These should be allocated on an SMP_CACHE_BYTES
+ * aligned boundary for optimal performance.
+ *
+ * On SYSIO, using an 8K page size we have 1GB of SBUS
+ * DMA space mapped.  We divide this space into equally
+ * sized clusters. We allocate a DMA mapping from the
+ * cluster that matches the order of the allocation, or
+ * if the order is greater than the number of clusters,
+ * we try to allocate from the last cluster.
+ */
+
+#define NCLUSTERS	8UL
+#define ONE_GIG		(1UL * 1024UL * 1024UL * 1024UL)
+#define CLUSTER_SIZE	(ONE_GIG / NCLUSTERS)
+#define CLUSTER_MASK	(CLUSTER_SIZE - 1)
+#define CLUSTER_NPAGES	(CLUSTER_SIZE >> IO_PAGE_SHIFT)
+#define MAP_BASE	((u32)0xc0000000)
+
+struct sbus_iommu {
+/*0x00*/spinlock_t		lock;
+
+/*0x08*/iopte_t			*page_table;
+/*0x10*/unsigned long		strbuf_regs;
+/*0x18*/unsigned long		iommu_regs;
+/*0x20*/unsigned long		sbus_control_reg;
+
+/*0x28*/volatile unsigned long	strbuf_flushflag;
+
+	/* If NCLUSTERS is ever decresed to 4 or lower,
+	 * you must increase the size of the type of
+	 * these counters.  You have been duly warned. -DaveM
+	 */
+/*0x30*/struct {
+		u16	next;
+		u16	flush;
+	} alloc_info[NCLUSTERS];
+
+	/* The lowest used consistent mapping entry.  Since
+	 * we allocate consistent maps out of cluster 0 this
+	 * is relative to the beginning of closter 0.
+	 */
+/*0x50*/u32		lowest_consistent_map;
+};
+
+/* Offsets from iommu_regs */
+#define SYSIO_IOMMUREG_BASE	0x2400UL
+#define IOMMU_CONTROL	(0x2400UL - 0x2400UL)	/* IOMMU control register */
+#define IOMMU_TSBBASE	(0x2408UL - 0x2400UL)	/* TSB base address register */
+#define IOMMU_FLUSH	(0x2410UL - 0x2400UL)	/* IOMMU flush register */
+#define IOMMU_VADIAG	(0x4400UL - 0x2400UL)	/* SBUS virtual address diagnostic */
+#define IOMMU_TAGCMP	(0x4408UL - 0x2400UL)	/* TLB tag compare diagnostics */
+#define IOMMU_LRUDIAG	(0x4500UL - 0x2400UL)	/* IOMMU LRU queue diagnostics */
+#define IOMMU_TAGDIAG	(0x4580UL - 0x2400UL)	/* TLB tag diagnostics */
+#define IOMMU_DRAMDIAG	(0x4600UL - 0x2400UL)	/* TLB data RAM diagnostics */
+
+#define IOMMU_DRAM_VALID	(1UL << 30UL)
+
+static void __iommu_flushall(struct sbus_iommu *iommu)
+{
+	unsigned long tag = iommu->iommu_regs + IOMMU_TAGDIAG;
+	int entry;
+
+	for (entry = 0; entry < 16; entry++) {
+		upa_writeq(0, tag);
+		tag += 8UL;
+	}
+	upa_readq(iommu->sbus_control_reg);
+
+	for (entry = 0; entry < NCLUSTERS; entry++) {
+		iommu->alloc_info[entry].flush =
+			iommu->alloc_info[entry].next;
+	}
+}
+
+static void iommu_flush(struct sbus_iommu *iommu, u32 base, unsigned long npages)
+{
+	while (npages--)
+		upa_writeq(base + (npages << IO_PAGE_SHIFT),
+			   iommu->iommu_regs + IOMMU_FLUSH);
+	upa_readq(iommu->sbus_control_reg);
+}
+
+/* Offsets from strbuf_regs */
+#define SYSIO_STRBUFREG_BASE	0x2800UL
+#define STRBUF_CONTROL	(0x2800UL - 0x2800UL)	/* Control */
+#define STRBUF_PFLUSH	(0x2808UL - 0x2800UL)	/* Page flush/invalidate */
+#define STRBUF_FSYNC	(0x2810UL - 0x2800UL)	/* Flush synchronization */
+#define STRBUF_DRAMDIAG	(0x5000UL - 0x2800UL)	/* data RAM diagnostic */
+#define STRBUF_ERRDIAG	(0x5400UL - 0x2800UL)	/* error status diagnostics */
+#define STRBUF_PTAGDIAG	(0x5800UL - 0x2800UL)	/* Page tag diagnostics */
+#define STRBUF_LTAGDIAG	(0x5900UL - 0x2800UL)	/* Line tag diagnostics */
+
+#define STRBUF_TAG_VALID	0x02UL
+
+static void strbuf_flush(struct sbus_iommu *iommu, u32 base, unsigned long npages)
+{
+	iommu->strbuf_flushflag = 0UL;
+	while (npages--)
+		upa_writeq(base + (npages << IO_PAGE_SHIFT),
+			   iommu->strbuf_regs + STRBUF_PFLUSH);
+
+	/* Whoopee cushion! */
+	upa_writeq(__pa(&iommu->strbuf_flushflag),
+		   iommu->strbuf_regs + STRBUF_FSYNC);
+	upa_readq(iommu->sbus_control_reg);
+	while (iommu->strbuf_flushflag == 0UL)
+		membar("#LoadLoad");
+}
+
+static iopte_t *alloc_streaming_cluster(struct sbus_iommu *iommu, unsigned long npages)
+{
+	iopte_t *iopte, *limit, *first, *cluster;
+	unsigned long cnum, ent, nent, flush_point, found;
+
+	cnum = 0;
+	nent = 1;
+	while ((1UL << cnum) < npages)
+		cnum++;
+	if(cnum >= NCLUSTERS) {
+		nent = 1UL << (cnum - NCLUSTERS);
+		cnum = NCLUSTERS - 1;
+	}
+	iopte  = iommu->page_table + (cnum * CLUSTER_NPAGES);
+
+	if (cnum == 0)
+		limit = (iommu->page_table +
+			 iommu->lowest_consistent_map);
+	else
+		limit = (iopte + CLUSTER_NPAGES);
+
+	iopte += ((ent = iommu->alloc_info[cnum].next) << cnum);
+	flush_point = iommu->alloc_info[cnum].flush;
+
+	first = iopte;
+	cluster = NULL;
+	found = 0;
+	for (;;) {
+		if (iopte_val(*iopte) == 0UL) {
+			found++;
+			if (!cluster)
+				cluster = iopte;
+		} else {
+			/* Used cluster in the way */
+			cluster = NULL;
+			found = 0;
+		}
+
+		if (found == nent)
+			break;
+
+		iopte += (1 << cnum);
+		ent++;
+		if (iopte >= limit) {
+			iopte = (iommu->page_table + (cnum * CLUSTER_NPAGES));
+			ent = 0;
+
+			/* Multiple cluster allocations must not wrap */
+			cluster = NULL;
+			found = 0;
+		}
+		if (ent == flush_point)
+			__iommu_flushall(iommu);
+		if (iopte == first)
+			goto bad;
+	}
+
+	/* ent/iopte points to the last cluster entry we're going to use,
+	 * so save our place for the next allocation.
+	 */
+	if ((iopte + (1 << cnum)) >= limit)
+		ent = 0;
+	else
+		ent = ent + 1;
+	iommu->alloc_info[cnum].next = ent;
+	if (ent == flush_point)
+		__iommu_flushall(iommu);
+
+	/* I've got your streaming cluster right here buddy boy... */
+	return cluster;
+
+bad:
+	printk(KERN_EMERG "sbus: alloc_streaming_cluster of npages(%ld) failed!\n",
+	       npages);
+	return NULL;
+}
+
+static void free_streaming_cluster(struct sbus_iommu *iommu, u32 base, unsigned long npages)
+{
+	unsigned long cnum, ent, nent;
+	iopte_t *iopte;
+
+	cnum = 0;
+	nent = 1;
+	while ((1UL << cnum) < npages)
+		cnum++;
+	if(cnum >= NCLUSTERS) {
+		nent = 1UL << (cnum - NCLUSTERS);
+		cnum = NCLUSTERS - 1;
+	}
+	ent = (base & CLUSTER_MASK) >> (IO_PAGE_SHIFT + cnum);
+	iopte = iommu->page_table + ((base - MAP_BASE) >> IO_PAGE_SHIFT);
+	do {
+		iopte_val(*iopte) = 0UL;
+		iopte += 1 << cnum;
+	} while(--nent);
+
+	/* If the global flush might not have caught this entry,
+	 * adjust the flush point such that we will flush before
+	 * ever trying to reuse it.
+	 */
+#define between(X,Y,Z)	(((Z) - (Y)) >= ((X) - (Y)))
+	if (between(ent, iommu->alloc_info[cnum].next, iommu->alloc_info[cnum].flush))
+		iommu->alloc_info[cnum].flush = ent;
+#undef between
+}
+
+/* We allocate consistent mappings from the end of cluster zero. */
+static iopte_t *alloc_consistent_cluster(struct sbus_iommu *iommu, unsigned long npages)
+{
+	iopte_t *iopte;
+
+	iopte = iommu->page_table + (1 * CLUSTER_NPAGES);
+	while (iopte > iommu->page_table) {
+		iopte--;
+		if (!(iopte_val(*iopte) & IOPTE_VALID)) {
+			unsigned long tmp = npages;
+
+			while (--tmp) {
+				iopte--;
+				if (iopte_val(*iopte) & IOPTE_VALID)
+					break;
+			}
+			if (tmp == 0) {
+				u32 entry = (iopte - iommu->page_table);
+
+				if (entry < iommu->lowest_consistent_map)
+					iommu->lowest_consistent_map = entry;
+				return iopte;
+			}
+		}
+	}
+	return NULL;
+}
+
+static void free_consistent_cluster(struct sbus_iommu *iommu, u32 base, unsigned long npages)
+{
+	iopte_t *iopte = iommu->page_table + ((base - MAP_BASE) >> IO_PAGE_SHIFT);
+
+	if ((iopte - iommu->page_table) == iommu->lowest_consistent_map) {
+		iopte_t *walk = iopte + npages;
+		iopte_t *limit;
+
+		limit = iommu->page_table + CLUSTER_NPAGES;
+		while (walk < limit) {
+			if (iopte_val(*walk) != 0UL)
+				break;
+			walk++;
+		}
+		iommu->lowest_consistent_map =
+			(walk - iommu->page_table);
+	}
+
+	while (npages--)
+		*iopte++ = __iopte(0UL);
+}
+
+void *sbus_alloc_consistent(struct sbus_dev *sdev, size_t size, dma_addr_t *dvma_addr)
+{
+	unsigned long order, first_page, flags;
+	struct sbus_iommu *iommu;
+	iopte_t *iopte;
+	void *ret;
+	int npages;
+
+	if (size <= 0 || sdev == NULL || dvma_addr == NULL)
+		return NULL;
+
+	size = IO_PAGE_ALIGN(size);
+	order = get_order(size);
+	if (order >= 10)
+		return NULL;
+	first_page = __get_free_pages(GFP_KERNEL, order);
+	if (first_page == 0UL)
+		return NULL;
+	memset((char *)first_page, 0, PAGE_SIZE << order);
+
+	iommu = sdev->bus->iommu;
+
+	spin_lock_irqsave(&iommu->lock, flags);
+	iopte = alloc_consistent_cluster(iommu, size >> IO_PAGE_SHIFT);
+	if (iopte == NULL) {
+		spin_unlock_irqrestore(&iommu->lock, flags);
+		free_pages(first_page, order);
+		return NULL;
+	}
+
+	/* Ok, we're committed at this point. */
+	*dvma_addr = MAP_BASE +	((iopte - iommu->page_table) << IO_PAGE_SHIFT);
+	ret = (void *) first_page;
+	npages = size >> IO_PAGE_SHIFT;
+	while (npages--) {
+		*iopte++ = __iopte(IOPTE_VALID | IOPTE_CACHE | IOPTE_WRITE |
+				   (__pa(first_page) & IOPTE_PAGE));
+		first_page += IO_PAGE_SIZE;
+	}
+	iommu_flush(iommu, *dvma_addr, size >> IO_PAGE_SHIFT);
+	spin_unlock_irqrestore(&iommu->lock, flags);
+
+	return ret;
+}
+
+void sbus_free_consistent(struct sbus_dev *sdev, size_t size, void *cpu, dma_addr_t dvma)
+{
+	unsigned long order, npages;
+	struct sbus_iommu *iommu;
+
+	if (size <= 0 || sdev == NULL || cpu == NULL)
+		return;
+
+	npages = IO_PAGE_ALIGN(size) >> IO_PAGE_SHIFT;
+	iommu = sdev->bus->iommu;
+
+	spin_lock_irq(&iommu->lock);
+	free_consistent_cluster(iommu, dvma, npages);
+	iommu_flush(iommu, dvma, npages);
+	spin_unlock_irq(&iommu->lock);
+
+	order = get_order(size);
+	if (order < 10)
+		free_pages((unsigned long)cpu, order);
+}
+
+dma_addr_t sbus_map_single(struct sbus_dev *sdev, void *ptr, size_t size, int dir)
+{
+	struct sbus_iommu *iommu = sdev->bus->iommu;
+	unsigned long npages, pbase, flags;
+	iopte_t *iopte;
+	u32 dma_base, offset;
+	unsigned long iopte_bits;
+
+	if (dir == SBUS_DMA_NONE)
+		BUG();
+
+	pbase = (unsigned long) ptr;
+	offset = (u32) (pbase & ~IO_PAGE_MASK);
+	size = (IO_PAGE_ALIGN(pbase + size) - (pbase & IO_PAGE_MASK));
+	pbase = (unsigned long) __pa(pbase & IO_PAGE_MASK);
+
+	spin_lock_irqsave(&iommu->lock, flags);
+	npages = size >> IO_PAGE_SHIFT;
+	iopte = alloc_streaming_cluster(iommu, npages);
+	if (iopte == NULL)
+		goto bad;
+	dma_base = MAP_BASE + ((iopte - iommu->page_table) << IO_PAGE_SHIFT);
+	npages = size >> IO_PAGE_SHIFT;
+	iopte_bits = IOPTE_VALID | IOPTE_STBUF | IOPTE_CACHE;
+	if (dir != SBUS_DMA_TODEVICE)
+		iopte_bits |= IOPTE_WRITE;
+	while (npages--) {
+		*iopte++ = __iopte(iopte_bits | (pbase & IOPTE_PAGE));
+		pbase += IO_PAGE_SIZE;
+	}
+	npages = size >> IO_PAGE_SHIFT;
+	spin_unlock_irqrestore(&iommu->lock, flags);
+
+	return (dma_base | offset);
+
+bad:
+	spin_unlock_irqrestore(&iommu->lock, flags);
+	BUG();
+	return 0;
+}
+
+void sbus_unmap_single(struct sbus_dev *sdev, dma_addr_t dma_addr, size_t size, int direction)
+{
+	struct sbus_iommu *iommu = sdev->bus->iommu;
+	u32 dma_base = dma_addr & IO_PAGE_MASK;
+	unsigned long flags;
+
+	size = (IO_PAGE_ALIGN(dma_addr + size) - dma_base);
+
+	spin_lock_irqsave(&iommu->lock, flags);
+	free_streaming_cluster(iommu, dma_base, size >> IO_PAGE_SHIFT);
+	strbuf_flush(iommu, dma_base, size >> IO_PAGE_SHIFT);
+	spin_unlock_irqrestore(&iommu->lock, flags);
+}
+
+#define SG_ENT_PHYS_ADDRESS(SG)	\
+	(__pa(page_address((SG)->page)) + (SG)->offset)
+
+static inline void fill_sg(iopte_t *iopte, struct scatterlist *sg, int nused, int nelems, unsigned long iopte_bits)
+{
+	struct scatterlist *dma_sg = sg;
+	struct scatterlist *sg_end = sg + nelems;
+	int i;
+
+	for (i = 0; i < nused; i++) {
+		unsigned long pteval = ~0UL;
+		u32 dma_npages;
+
+		dma_npages = ((dma_sg->dma_address & (IO_PAGE_SIZE - 1UL)) +
+			      dma_sg->dma_length +
+			      ((IO_PAGE_SIZE - 1UL))) >> IO_PAGE_SHIFT;
+		do {
+			unsigned long offset;
+			signed int len;
+
+			/* If we are here, we know we have at least one
+			 * more page to map.  So walk forward until we
+			 * hit a page crossing, and begin creating new
+			 * mappings from that spot.
+			 */
+			for (;;) {
+				unsigned long tmp;
+
+				tmp = (unsigned long) SG_ENT_PHYS_ADDRESS(sg);
+				len = sg->length;
+				if (((tmp ^ pteval) >> IO_PAGE_SHIFT) != 0UL) {
+					pteval = tmp & IO_PAGE_MASK;
+					offset = tmp & (IO_PAGE_SIZE - 1UL);
+					break;
+				}
+				if (((tmp ^ (tmp + len - 1UL)) >> IO_PAGE_SHIFT) != 0UL) {
+					pteval = (tmp + IO_PAGE_SIZE) & IO_PAGE_MASK;
+					offset = 0UL;
+					len -= (IO_PAGE_SIZE - (tmp & (IO_PAGE_SIZE - 1UL)));
+					break;
+				}
+				sg++;
+			}
+
+			pteval = ((pteval & IOPTE_PAGE) | iopte_bits);
+			while (len > 0) {
+				*iopte++ = __iopte(pteval);
+				pteval += IO_PAGE_SIZE;
+				len -= (IO_PAGE_SIZE - offset);
+				offset = 0;
+				dma_npages--;
+			}
+
+			pteval = (pteval & IOPTE_PAGE) + len;
+			sg++;
+
+			/* Skip over any tail mappings we've fully mapped,
+			 * adjusting pteval along the way.  Stop when we
+			 * detect a page crossing event.
+			 */
+			while (sg < sg_end &&
+			       (pteval << (64 - IO_PAGE_SHIFT)) != 0UL &&
+			       (pteval == SG_ENT_PHYS_ADDRESS(sg)) &&
+			       ((pteval ^
+				 (SG_ENT_PHYS_ADDRESS(sg) + sg->length - 1UL)) >> IO_PAGE_SHIFT) == 0UL) {
+				pteval += sg->length;
+				sg++;
+			}
+			if ((pteval << (64 - IO_PAGE_SHIFT)) == 0UL)
+				pteval = ~0UL;
+		} while (dma_npages != 0);
+		dma_sg++;
+	}
+}
+
+int sbus_map_sg(struct sbus_dev *sdev, struct scatterlist *sg, int nents, int dir)
+{
+	struct sbus_iommu *iommu = sdev->bus->iommu;
+	unsigned long flags, npages;
+	iopte_t *iopte;
+	u32 dma_base;
+	struct scatterlist *sgtmp;
+	int used;
+	unsigned long iopte_bits;
+
+	if (dir == SBUS_DMA_NONE)
+		BUG();
+
+	/* Fast path single entry scatterlists. */
+	if (nents == 1) {
+		sg->dma_address =
+			sbus_map_single(sdev,
+					(page_address(sg->page) + sg->offset),
+					sg->length, dir);
+		sg->dma_length = sg->length;
+		return 1;
+	}
+
+	npages = prepare_sg(sg, nents);
+
+	spin_lock_irqsave(&iommu->lock, flags);
+	iopte = alloc_streaming_cluster(iommu, npages);
+	if (iopte == NULL)
+		goto bad;
+	dma_base = MAP_BASE + ((iopte - iommu->page_table) << IO_PAGE_SHIFT);
+
+	/* Normalize DVMA addresses. */
+	sgtmp = sg;
+	used = nents;
+
+	while (used && sgtmp->dma_length) {
+		sgtmp->dma_address += dma_base;
+		sgtmp++;
+		used--;
+	}
+	used = nents - used;
+
+	iopte_bits = IOPTE_VALID | IOPTE_STBUF | IOPTE_CACHE;
+	if (dir != SBUS_DMA_TODEVICE)
+		iopte_bits |= IOPTE_WRITE;
+
+	fill_sg(iopte, sg, used, nents, iopte_bits);
+#ifdef VERIFY_SG
+	verify_sglist(sg, nents, iopte, npages);
+#endif
+	spin_unlock_irqrestore(&iommu->lock, flags);
+
+	return used;
+
+bad:
+	spin_unlock_irqrestore(&iommu->lock, flags);
+	BUG();
+	return 0;
+}
+
+void sbus_unmap_sg(struct sbus_dev *sdev, struct scatterlist *sg, int nents, int direction)
+{
+	unsigned long size, flags;
+	struct sbus_iommu *iommu;
+	u32 dvma_base;
+	int i;
+
+	/* Fast path single entry scatterlists. */
+	if (nents == 1) {
+		sbus_unmap_single(sdev, sg->dma_address, sg->dma_length, direction);
+		return;
+	}
+
+	dvma_base = sg[0].dma_address & IO_PAGE_MASK;
+	for (i = 0; i < nents; i++) {
+		if (sg[i].dma_length == 0)
+			break;
+	}
+	i--;
+	size = IO_PAGE_ALIGN(sg[i].dma_address + sg[i].dma_length) - dvma_base;
+
+	iommu = sdev->bus->iommu;
+	spin_lock_irqsave(&iommu->lock, flags);
+	free_streaming_cluster(iommu, dvma_base, size >> IO_PAGE_SHIFT);
+	strbuf_flush(iommu, dvma_base, size >> IO_PAGE_SHIFT);
+	spin_unlock_irqrestore(&iommu->lock, flags);
+}
+
+void sbus_dma_sync_single_for_cpu(struct sbus_dev *sdev, dma_addr_t base, size_t size, int direction)
+{
+	struct sbus_iommu *iommu = sdev->bus->iommu;
+	unsigned long flags;
+
+	size = (IO_PAGE_ALIGN(base + size) - (base & IO_PAGE_MASK));
+
+	spin_lock_irqsave(&iommu->lock, flags);
+	strbuf_flush(iommu, base & IO_PAGE_MASK, size >> IO_PAGE_SHIFT);
+	spin_unlock_irqrestore(&iommu->lock, flags);
+}
+
+void sbus_dma_sync_single_for_device(struct sbus_dev *sdev, dma_addr_t base, size_t size, int direction)
+{
+}
+
+void sbus_dma_sync_sg_for_cpu(struct sbus_dev *sdev, struct scatterlist *sg, int nents, int direction)
+{
+	struct sbus_iommu *iommu = sdev->bus->iommu;
+	unsigned long flags, size;
+	u32 base;
+	int i;
+
+	base = sg[0].dma_address & IO_PAGE_MASK;
+	for (i = 0; i < nents; i++) {
+		if (sg[i].dma_length == 0)
+			break;
+	}
+	i--;
+	size = IO_PAGE_ALIGN(sg[i].dma_address + sg[i].dma_length) - base;
+
+	spin_lock_irqsave(&iommu->lock, flags);
+	strbuf_flush(iommu, base, size >> IO_PAGE_SHIFT);
+	spin_unlock_irqrestore(&iommu->lock, flags);
+}
+
+void sbus_dma_sync_sg_for_device(struct sbus_dev *sdev, struct scatterlist *sg, int nents, int direction)
+{
+}
+
+/* Enable 64-bit DVMA mode for the given device. */
+void sbus_set_sbus64(struct sbus_dev *sdev, int bursts)
+{
+	struct sbus_iommu *iommu = sdev->bus->iommu;
+	int slot = sdev->slot;
+	unsigned long cfg_reg;
+	u64 val;
+
+	cfg_reg = iommu->sbus_control_reg;
+	switch (slot) {
+	case 0:
+		cfg_reg += 0x20UL;
+		break;
+	case 1:
+		cfg_reg += 0x28UL;
+		break;
+	case 2:
+		cfg_reg += 0x30UL;
+		break;
+	case 3:
+		cfg_reg += 0x38UL;
+		break;
+	case 13:
+		cfg_reg += 0x40UL;
+		break;
+	case 14:
+		cfg_reg += 0x48UL;
+		break;
+	case 15:
+		cfg_reg += 0x50UL;
+		break;
+
+	default:
+		return;
+	};
+
+	val = upa_readq(cfg_reg);
+	if (val & (1UL << 14UL)) {
+		/* Extended transfer mode already enabled. */
+		return;
+	}
+
+	val |= (1UL << 14UL);
+
+	if (bursts & DMA_BURST8)
+		val |= (1UL << 1UL);
+	if (bursts & DMA_BURST16)
+		val |= (1UL << 2UL);
+	if (bursts & DMA_BURST32)
+		val |= (1UL << 3UL);
+	if (bursts & DMA_BURST64)
+		val |= (1UL << 4UL);
+	upa_writeq(val, cfg_reg);
+}
+
+/* SBUS SYSIO INO number to Sparc PIL level. */
+static unsigned char sysio_ino_to_pil[] = {
+	0, 4, 4, 7, 5, 7, 8, 9,		/* SBUS slot 0 */
+	0, 4, 4, 7, 5, 7, 8, 9,		/* SBUS slot 1 */
+	0, 4, 4, 7, 5, 7, 8, 9,		/* SBUS slot 2 */
+	0, 4, 4, 7, 5, 7, 8, 9,		/* SBUS slot 3 */
+	4, /* Onboard SCSI */
+	5, /* Onboard Ethernet */
+/*XXX*/	8, /* Onboard BPP */
+	0, /* Bogon */
+       13, /* Audio */
+/*XXX*/15, /* PowerFail */
+	0, /* Bogon */
+	0, /* Bogon */
+       12, /* Zilog Serial Channels (incl. Keyboard/Mouse lines) */
+       11, /* Floppy */
+	0, /* Spare Hardware (bogon for now) */
+	0, /* Keyboard (bogon for now) */
+	0, /* Mouse (bogon for now) */
+	0, /* Serial (bogon for now) */
+     0, 0, /* Bogon, Bogon */
+       10, /* Timer 0 */
+       11, /* Timer 1 */
+     0, 0, /* Bogon, Bogon */
+       15, /* Uncorrectable SBUS Error */
+       15, /* Correctable SBUS Error */
+       15, /* SBUS Error */
+/*XXX*/ 0, /* Power Management (bogon for now) */
+};
+
+/* INO number to IMAP register offset for SYSIO external IRQ's.
+ * This should conform to both Sunfire/Wildfire server and Fusion
+ * desktop designs.
+ */
+#define SYSIO_IMAP_SLOT0	0x2c04UL
+#define SYSIO_IMAP_SLOT1	0x2c0cUL
+#define SYSIO_IMAP_SLOT2	0x2c14UL
+#define SYSIO_IMAP_SLOT3	0x2c1cUL
+#define SYSIO_IMAP_SCSI		0x3004UL
+#define SYSIO_IMAP_ETH		0x300cUL
+#define SYSIO_IMAP_BPP		0x3014UL
+#define SYSIO_IMAP_AUDIO	0x301cUL
+#define SYSIO_IMAP_PFAIL	0x3024UL
+#define SYSIO_IMAP_KMS		0x302cUL
+#define SYSIO_IMAP_FLPY		0x3034UL
+#define SYSIO_IMAP_SHW		0x303cUL
+#define SYSIO_IMAP_KBD		0x3044UL
+#define SYSIO_IMAP_MS		0x304cUL
+#define SYSIO_IMAP_SER		0x3054UL
+#define SYSIO_IMAP_TIM0		0x3064UL
+#define SYSIO_IMAP_TIM1		0x306cUL
+#define SYSIO_IMAP_UE		0x3074UL
+#define SYSIO_IMAP_CE		0x307cUL
+#define SYSIO_IMAP_SBERR	0x3084UL
+#define SYSIO_IMAP_PMGMT	0x308cUL
+#define SYSIO_IMAP_GFX		0x3094UL
+#define SYSIO_IMAP_EUPA		0x309cUL
+
+#define bogon     ((unsigned long) -1)
+static unsigned long sysio_irq_offsets[] = {
+	/* SBUS Slot 0 --> 3, level 1 --> 7 */
+	SYSIO_IMAP_SLOT0, SYSIO_IMAP_SLOT0, SYSIO_IMAP_SLOT0, SYSIO_IMAP_SLOT0,
+	SYSIO_IMAP_SLOT0, SYSIO_IMAP_SLOT0, SYSIO_IMAP_SLOT0, SYSIO_IMAP_SLOT0,
+	SYSIO_IMAP_SLOT1, SYSIO_IMAP_SLOT1, SYSIO_IMAP_SLOT1, SYSIO_IMAP_SLOT1,
+	SYSIO_IMAP_SLOT1, SYSIO_IMAP_SLOT1, SYSIO_IMAP_SLOT1, SYSIO_IMAP_SLOT1,
+	SYSIO_IMAP_SLOT2, SYSIO_IMAP_SLOT2, SYSIO_IMAP_SLOT2, SYSIO_IMAP_SLOT2,
+	SYSIO_IMAP_SLOT2, SYSIO_IMAP_SLOT2, SYSIO_IMAP_SLOT2, SYSIO_IMAP_SLOT2,
+	SYSIO_IMAP_SLOT3, SYSIO_IMAP_SLOT3, SYSIO_IMAP_SLOT3, SYSIO_IMAP_SLOT3,
+	SYSIO_IMAP_SLOT3, SYSIO_IMAP_SLOT3, SYSIO_IMAP_SLOT3, SYSIO_IMAP_SLOT3,
+
+	/* Onboard devices (not relevant/used on SunFire). */
+	SYSIO_IMAP_SCSI,
+	SYSIO_IMAP_ETH,
+	SYSIO_IMAP_BPP,
+	bogon,
+	SYSIO_IMAP_AUDIO,
+	SYSIO_IMAP_PFAIL,
+	bogon,
+	bogon,
+	SYSIO_IMAP_KMS,
+	SYSIO_IMAP_FLPY,
+	SYSIO_IMAP_SHW,
+	SYSIO_IMAP_KBD,
+	SYSIO_IMAP_MS,
+	SYSIO_IMAP_SER,
+	bogon,
+	bogon,
+	SYSIO_IMAP_TIM0,
+	SYSIO_IMAP_TIM1,
+	bogon,
+	bogon,
+	SYSIO_IMAP_UE,
+	SYSIO_IMAP_CE,
+	SYSIO_IMAP_SBERR,
+	SYSIO_IMAP_PMGMT,
+};
+
+#undef bogon
+
+#define NUM_SYSIO_OFFSETS (sizeof(sysio_irq_offsets) / sizeof(sysio_irq_offsets[0]))
+
+/* Convert Interrupt Mapping register pointer to associated
+ * Interrupt Clear register pointer, SYSIO specific version.
+ */
+#define SYSIO_ICLR_UNUSED0	0x3400UL
+#define SYSIO_ICLR_SLOT0	0x340cUL
+#define SYSIO_ICLR_SLOT1	0x344cUL
+#define SYSIO_ICLR_SLOT2	0x348cUL
+#define SYSIO_ICLR_SLOT3	0x34ccUL
+static unsigned long sysio_imap_to_iclr(unsigned long imap)
+{
+	unsigned long diff = SYSIO_ICLR_UNUSED0 - SYSIO_IMAP_SLOT0;
+	return imap + diff;
+}
+
+unsigned int sbus_build_irq(void *buscookie, unsigned int ino)
+{
+	struct sbus_bus *sbus = (struct sbus_bus *)buscookie;
+	struct sbus_iommu *iommu = sbus->iommu;
+	unsigned long reg_base = iommu->sbus_control_reg - 0x2000UL;
+	unsigned long imap, iclr;
+	int pil, sbus_level = 0;
+
+	pil = sysio_ino_to_pil[ino];
+	if (!pil) {
+		printk("sbus_irq_build: Bad SYSIO INO[%x]\n", ino);
+		panic("Bad SYSIO IRQ translations...");
+	}
+
+	if (PIL_RESERVED(pil))
+		BUG();
+
+	imap = sysio_irq_offsets[ino];
+	if (imap == ((unsigned long)-1)) {
+		prom_printf("get_irq_translations: Bad SYSIO INO[%x] cpu[%d]\n",
+			    ino, pil);
+		prom_halt();
+	}
+	imap += reg_base;
+
+	/* SYSIO inconsistency.  For external SLOTS, we have to select
+	 * the right ICLR register based upon the lower SBUS irq level
+	 * bits.
+	 */
+	if (ino >= 0x20) {
+		iclr = sysio_imap_to_iclr(imap);
+	} else {
+		int sbus_slot = (ino & 0x18)>>3;
+		
+		sbus_level = ino & 0x7;
+
+		switch(sbus_slot) {
+		case 0:
+			iclr = reg_base + SYSIO_ICLR_SLOT0;
+			break;
+		case 1:
+			iclr = reg_base + SYSIO_ICLR_SLOT1;
+			break;
+		case 2:
+			iclr = reg_base + SYSIO_ICLR_SLOT2;
+			break;
+		default:
+		case 3:
+			iclr = reg_base + SYSIO_ICLR_SLOT3;
+			break;
+		};
+
+		iclr += ((unsigned long)sbus_level - 1UL) * 8UL;
+	}
+	return build_irq(pil, sbus_level, iclr, imap);
+}
+
+/* Error interrupt handling. */
+#define SYSIO_UE_AFSR	0x0030UL
+#define SYSIO_UE_AFAR	0x0038UL
+#define  SYSIO_UEAFSR_PPIO  0x8000000000000000UL /* Primary PIO cause         */
+#define  SYSIO_UEAFSR_PDRD  0x4000000000000000UL /* Primary DVMA read cause   */
+#define  SYSIO_UEAFSR_PDWR  0x2000000000000000UL /* Primary DVMA write cause  */
+#define  SYSIO_UEAFSR_SPIO  0x1000000000000000UL /* Secondary PIO is cause    */
+#define  SYSIO_UEAFSR_SDRD  0x0800000000000000UL /* Secondary DVMA read cause */
+#define  SYSIO_UEAFSR_SDWR  0x0400000000000000UL /* Secondary DVMA write cause*/
+#define  SYSIO_UEAFSR_RESV1 0x03ff000000000000UL /* Reserved                  */
+#define  SYSIO_UEAFSR_DOFF  0x0000e00000000000UL /* Doubleword Offset         */
+#define  SYSIO_UEAFSR_SIZE  0x00001c0000000000UL /* Bad transfer size 2^SIZE  */
+#define  SYSIO_UEAFSR_MID   0x000003e000000000UL /* UPA MID causing the fault */
+#define  SYSIO_UEAFSR_RESV2 0x0000001fffffffffUL /* Reserved                  */
+static irqreturn_t sysio_ue_handler(int irq, void *dev_id, struct pt_regs *regs)
+{
+	struct sbus_bus *sbus = dev_id;
+	struct sbus_iommu *iommu = sbus->iommu;
+	unsigned long reg_base = iommu->sbus_control_reg - 0x2000UL;
+	unsigned long afsr_reg, afar_reg;
+	unsigned long afsr, afar, error_bits;
+	int reported;
+
+	afsr_reg = reg_base + SYSIO_UE_AFSR;
+	afar_reg = reg_base + SYSIO_UE_AFAR;
+
+	/* Latch error status. */
+	afsr = upa_readq(afsr_reg);
+	afar = upa_readq(afar_reg);
+
+	/* Clear primary/secondary error status bits. */
+	error_bits = afsr &
+		(SYSIO_UEAFSR_PPIO | SYSIO_UEAFSR_PDRD | SYSIO_UEAFSR_PDWR |
+		 SYSIO_UEAFSR_SPIO | SYSIO_UEAFSR_SDRD | SYSIO_UEAFSR_SDWR);
+	upa_writeq(error_bits, afsr_reg);
+
+	/* Log the error. */
+	printk("SYSIO[%x]: Uncorrectable ECC Error, primary error type[%s]\n",
+	       sbus->portid,
+	       (((error_bits & SYSIO_UEAFSR_PPIO) ?
+		 "PIO" :
+		 ((error_bits & SYSIO_UEAFSR_PDRD) ?
+		  "DVMA Read" :
+		  ((error_bits & SYSIO_UEAFSR_PDWR) ?
+		   "DVMA Write" : "???")))));
+	printk("SYSIO[%x]: DOFF[%lx] SIZE[%lx] MID[%lx]\n",
+	       sbus->portid,
+	       (afsr & SYSIO_UEAFSR_DOFF) >> 45UL,
+	       (afsr & SYSIO_UEAFSR_SIZE) >> 42UL,
+	       (afsr & SYSIO_UEAFSR_MID) >> 37UL);
+	printk("SYSIO[%x]: AFAR[%016lx]\n", sbus->portid, afar);
+	printk("SYSIO[%x]: Secondary UE errors [", sbus->portid);
+	reported = 0;
+	if (afsr & SYSIO_UEAFSR_SPIO) {
+		reported++;
+		printk("(PIO)");
+	}
+	if (afsr & SYSIO_UEAFSR_SDRD) {
+		reported++;
+		printk("(DVMA Read)");
+	}
+	if (afsr & SYSIO_UEAFSR_SDWR) {
+		reported++;
+		printk("(DVMA Write)");
+	}
+	if (!reported)
+		printk("(none)");
+	printk("]\n");
+
+	return IRQ_HANDLED;
+}
+
+#define SYSIO_CE_AFSR	0x0040UL
+#define SYSIO_CE_AFAR	0x0048UL
+#define  SYSIO_CEAFSR_PPIO  0x8000000000000000UL /* Primary PIO cause         */
+#define  SYSIO_CEAFSR_PDRD  0x4000000000000000UL /* Primary DVMA read cause   */
+#define  SYSIO_CEAFSR_PDWR  0x2000000000000000UL /* Primary DVMA write cause  */
+#define  SYSIO_CEAFSR_SPIO  0x1000000000000000UL /* Secondary PIO cause       */
+#define  SYSIO_CEAFSR_SDRD  0x0800000000000000UL /* Secondary DVMA read cause */
+#define  SYSIO_CEAFSR_SDWR  0x0400000000000000UL /* Secondary DVMA write cause*/
+#define  SYSIO_CEAFSR_RESV1 0x0300000000000000UL /* Reserved                  */
+#define  SYSIO_CEAFSR_ESYND 0x00ff000000000000UL /* Syndrome Bits             */
+#define  SYSIO_CEAFSR_DOFF  0x0000e00000000000UL /* Double Offset             */
+#define  SYSIO_CEAFSR_SIZE  0x00001c0000000000UL /* Bad transfer size 2^SIZE  */
+#define  SYSIO_CEAFSR_MID   0x000003e000000000UL /* UPA MID causing the fault */
+#define  SYSIO_CEAFSR_RESV2 0x0000001fffffffffUL /* Reserved                  */
+static irqreturn_t sysio_ce_handler(int irq, void *dev_id, struct pt_regs *regs)
+{
+	struct sbus_bus *sbus = dev_id;
+	struct sbus_iommu *iommu = sbus->iommu;
+	unsigned long reg_base = iommu->sbus_control_reg - 0x2000UL;
+	unsigned long afsr_reg, afar_reg;
+	unsigned long afsr, afar, error_bits;
+	int reported;
+
+	afsr_reg = reg_base + SYSIO_CE_AFSR;
+	afar_reg = reg_base + SYSIO_CE_AFAR;
+
+	/* Latch error status. */
+	afsr = upa_readq(afsr_reg);
+	afar = upa_readq(afar_reg);
+
+	/* Clear primary/secondary error status bits. */
+	error_bits = afsr &
+		(SYSIO_CEAFSR_PPIO | SYSIO_CEAFSR_PDRD | SYSIO_CEAFSR_PDWR |
+		 SYSIO_CEAFSR_SPIO | SYSIO_CEAFSR_SDRD | SYSIO_CEAFSR_SDWR);
+	upa_writeq(error_bits, afsr_reg);
+
+	printk("SYSIO[%x]: Correctable ECC Error, primary error type[%s]\n",
+	       sbus->portid,
+	       (((error_bits & SYSIO_CEAFSR_PPIO) ?
+		 "PIO" :
+		 ((error_bits & SYSIO_CEAFSR_PDRD) ?
+		  "DVMA Read" :
+		  ((error_bits & SYSIO_CEAFSR_PDWR) ?
+		   "DVMA Write" : "???")))));
+
+	/* XXX Use syndrome and afar to print out module string just like
+	 * XXX UDB CE trap handler does... -DaveM
+	 */
+	printk("SYSIO[%x]: DOFF[%lx] ECC Syndrome[%lx] Size[%lx] MID[%lx]\n",
+	       sbus->portid,
+	       (afsr & SYSIO_CEAFSR_DOFF) >> 45UL,
+	       (afsr & SYSIO_CEAFSR_ESYND) >> 48UL,
+	       (afsr & SYSIO_CEAFSR_SIZE) >> 42UL,
+	       (afsr & SYSIO_CEAFSR_MID) >> 37UL);
+	printk("SYSIO[%x]: AFAR[%016lx]\n", sbus->portid, afar);
+
+	printk("SYSIO[%x]: Secondary CE errors [", sbus->portid);
+	reported = 0;
+	if (afsr & SYSIO_CEAFSR_SPIO) {
+		reported++;
+		printk("(PIO)");
+	}
+	if (afsr & SYSIO_CEAFSR_SDRD) {
+		reported++;
+		printk("(DVMA Read)");
+	}
+	if (afsr & SYSIO_CEAFSR_SDWR) {
+		reported++;
+		printk("(DVMA Write)");
+	}
+	if (!reported)
+		printk("(none)");
+	printk("]\n");
+
+	return IRQ_HANDLED;
+}
+
+#define SYSIO_SBUS_AFSR		0x2010UL
+#define SYSIO_SBUS_AFAR		0x2018UL
+#define  SYSIO_SBAFSR_PLE   0x8000000000000000UL /* Primary Late PIO Error    */
+#define  SYSIO_SBAFSR_PTO   0x4000000000000000UL /* Primary SBUS Timeout      */
+#define  SYSIO_SBAFSR_PBERR 0x2000000000000000UL /* Primary SBUS Error ACK    */
+#define  SYSIO_SBAFSR_SLE   0x1000000000000000UL /* Secondary Late PIO Error  */
+#define  SYSIO_SBAFSR_STO   0x0800000000000000UL /* Secondary SBUS Timeout    */
+#define  SYSIO_SBAFSR_SBERR 0x0400000000000000UL /* Secondary SBUS Error ACK  */
+#define  SYSIO_SBAFSR_RESV1 0x03ff000000000000UL /* Reserved                  */
+#define  SYSIO_SBAFSR_RD    0x0000800000000000UL /* Primary was late PIO read */
+#define  SYSIO_SBAFSR_RESV2 0x0000600000000000UL /* Reserved                  */
+#define  SYSIO_SBAFSR_SIZE  0x00001c0000000000UL /* Size of transfer          */
+#define  SYSIO_SBAFSR_MID   0x000003e000000000UL /* MID causing the error     */
+#define  SYSIO_SBAFSR_RESV3 0x0000001fffffffffUL /* Reserved                  */
+static irqreturn_t sysio_sbus_error_handler(int irq, void *dev_id, struct pt_regs *regs)
+{
+	struct sbus_bus *sbus = dev_id;
+	struct sbus_iommu *iommu = sbus->iommu;
+	unsigned long afsr_reg, afar_reg, reg_base;
+	unsigned long afsr, afar, error_bits;
+	int reported;
+
+	reg_base = iommu->sbus_control_reg - 0x2000UL;
+	afsr_reg = reg_base + SYSIO_SBUS_AFSR;
+	afar_reg = reg_base + SYSIO_SBUS_AFAR;
+
+	afsr = upa_readq(afsr_reg);
+	afar = upa_readq(afar_reg);
+
+	/* Clear primary/secondary error status bits. */
+	error_bits = afsr &
+		(SYSIO_SBAFSR_PLE | SYSIO_SBAFSR_PTO | SYSIO_SBAFSR_PBERR |
+		 SYSIO_SBAFSR_SLE | SYSIO_SBAFSR_STO | SYSIO_SBAFSR_SBERR);
+	upa_writeq(error_bits, afsr_reg);
+
+	/* Log the error. */
+	printk("SYSIO[%x]: SBUS Error, primary error type[%s] read(%d)\n",
+	       sbus->portid,
+	       (((error_bits & SYSIO_SBAFSR_PLE) ?
+		 "Late PIO Error" :
+		 ((error_bits & SYSIO_SBAFSR_PTO) ?
+		  "Time Out" :
+		  ((error_bits & SYSIO_SBAFSR_PBERR) ?
+		   "Error Ack" : "???")))),
+	       (afsr & SYSIO_SBAFSR_RD) ? 1 : 0);
+	printk("SYSIO[%x]: size[%lx] MID[%lx]\n",
+	       sbus->portid,
+	       (afsr & SYSIO_SBAFSR_SIZE) >> 42UL,
+	       (afsr & SYSIO_SBAFSR_MID) >> 37UL);
+	printk("SYSIO[%x]: AFAR[%016lx]\n", sbus->portid, afar);
+	printk("SYSIO[%x]: Secondary SBUS errors [", sbus->portid);
+	reported = 0;
+	if (afsr & SYSIO_SBAFSR_SLE) {
+		reported++;
+		printk("(Late PIO Error)");
+	}
+	if (afsr & SYSIO_SBAFSR_STO) {
+		reported++;
+		printk("(Time Out)");
+	}
+	if (afsr & SYSIO_SBAFSR_SBERR) {
+		reported++;
+		printk("(Error Ack)");
+	}
+	if (!reported)
+		printk("(none)");
+	printk("]\n");
+
+	/* XXX check iommu/strbuf for further error status XXX */
+
+	return IRQ_HANDLED;
+}
+
+#define ECC_CONTROL	0x0020UL
+#define  SYSIO_ECNTRL_ECCEN	0x8000000000000000UL /* Enable ECC Checking   */
+#define  SYSIO_ECNTRL_UEEN	0x4000000000000000UL /* Enable UE Interrupts  */
+#define  SYSIO_ECNTRL_CEEN	0x2000000000000000UL /* Enable CE Interrupts  */
+
+#define SYSIO_UE_INO		0x34
+#define SYSIO_CE_INO		0x35
+#define SYSIO_SBUSERR_INO	0x36
+
+static void __init sysio_register_error_handlers(struct sbus_bus *sbus)
+{
+	struct sbus_iommu *iommu = sbus->iommu;
+	unsigned long reg_base = iommu->sbus_control_reg - 0x2000UL;
+	unsigned int irq;
+	u64 control;
+
+	irq = sbus_build_irq(sbus, SYSIO_UE_INO);
+	if (request_irq(irq, sysio_ue_handler,
+			SA_SHIRQ, "SYSIO UE", sbus) < 0) {
+		prom_printf("SYSIO[%x]: Cannot register UE interrupt.\n",
+			    sbus->portid);
+		prom_halt();
+	}
+
+	irq = sbus_build_irq(sbus, SYSIO_CE_INO);
+	if (request_irq(irq, sysio_ce_handler,
+			SA_SHIRQ, "SYSIO CE", sbus) < 0) {
+		prom_printf("SYSIO[%x]: Cannot register CE interrupt.\n",
+			    sbus->portid);
+		prom_halt();
+	}
+
+	irq = sbus_build_irq(sbus, SYSIO_SBUSERR_INO);
+	if (request_irq(irq, sysio_sbus_error_handler,
+			SA_SHIRQ, "SYSIO SBUS Error", sbus) < 0) {
+		prom_printf("SYSIO[%x]: Cannot register SBUS Error interrupt.\n",
+			    sbus->portid);
+		prom_halt();
+	}
+
+	/* Now turn the error interrupts on and also enable ECC checking. */
+	upa_writeq((SYSIO_ECNTRL_ECCEN |
+		    SYSIO_ECNTRL_UEEN  |
+		    SYSIO_ECNTRL_CEEN),
+		   reg_base + ECC_CONTROL);
+
+	control = upa_readq(iommu->sbus_control_reg);
+	control |= 0x100UL; /* SBUS Error Interrupt Enable */
+	upa_writeq(control, iommu->sbus_control_reg);
+}
+
+/* Boot time initialization. */
+void __init sbus_iommu_init(int prom_node, struct sbus_bus *sbus)
+{
+	struct linux_prom64_registers rprop;
+	struct sbus_iommu *iommu;
+	unsigned long regs, tsb_base;
+	u64 control;
+	int err, i;
+
+	sbus->portid = prom_getintdefault(sbus->prom_node,
+					  "upa-portid", -1);
+
+	err = prom_getproperty(prom_node, "reg",
+			       (char *)&rprop, sizeof(rprop));
+	if (err < 0) {
+		prom_printf("sbus_iommu_init: Cannot map SYSIO control registers.\n");
+		prom_halt();
+	}
+	regs = rprop.phys_addr;
+
+	iommu = kmalloc(sizeof(*iommu) + SMP_CACHE_BYTES, GFP_ATOMIC);
+	if (iommu == NULL) {
+		prom_printf("sbus_iommu_init: Fatal error, kmalloc(iommu) failed\n");
+		prom_halt();
+	}
+
+	/* Align on E$ line boundary. */
+	iommu = (struct sbus_iommu *)
+		(((unsigned long)iommu + (SMP_CACHE_BYTES - 1UL)) &
+		 ~(SMP_CACHE_BYTES - 1UL));
+
+	memset(iommu, 0, sizeof(*iommu));
+
+	/* We start with no consistent mappings. */
+	iommu->lowest_consistent_map = CLUSTER_NPAGES;
+
+	for (i = 0; i < NCLUSTERS; i++) {
+		iommu->alloc_info[i].flush = 0;
+		iommu->alloc_info[i].next = 0;
+	}
+
+	/* Setup spinlock. */
+	spin_lock_init(&iommu->lock);
+
+	/* Init register offsets. */
+	iommu->iommu_regs = regs + SYSIO_IOMMUREG_BASE;
+	iommu->strbuf_regs = regs + SYSIO_STRBUFREG_BASE;
+
+	/* The SYSIO SBUS control register is used for dummy reads
+	 * in order to ensure write completion.
+	 */
+	iommu->sbus_control_reg = regs + 0x2000UL;
+
+	/* Link into SYSIO software state. */
+	sbus->iommu = iommu;
+
+	printk("SYSIO: UPA portID %x, at %016lx\n",
+	       sbus->portid, regs);
+
+	/* Setup for TSB_SIZE=7, TBW_SIZE=0, MMU_DE=1, MMU_EN=1 */
+	control = upa_readq(iommu->iommu_regs + IOMMU_CONTROL);
+	control = ((7UL << 16UL)	|
+		   (0UL << 2UL)		|
+		   (1UL << 1UL)		|
+		   (1UL << 0UL));
+
+	/* Using the above configuration we need 1MB iommu page
+	 * table (128K ioptes * 8 bytes per iopte).  This is
+	 * page order 7 on UltraSparc.
+	 */
+	tsb_base = __get_free_pages(GFP_ATOMIC, get_order(IO_TSB_SIZE));
+	if (tsb_base == 0UL) {
+		prom_printf("sbus_iommu_init: Fatal error, cannot alloc TSB table.\n");
+		prom_halt();
+	}
+
+	iommu->page_table = (iopte_t *) tsb_base;
+	memset(iommu->page_table, 0, IO_TSB_SIZE);
+
+	upa_writeq(control, iommu->iommu_regs + IOMMU_CONTROL);
+
+	/* Clean out any cruft in the IOMMU using
+	 * diagnostic accesses.
+	 */
+	for (i = 0; i < 16; i++) {
+		unsigned long dram = iommu->iommu_regs + IOMMU_DRAMDIAG;
+		unsigned long tag = iommu->iommu_regs + IOMMU_TAGDIAG;
+
+		dram += (unsigned long)i * 8UL;
+		tag += (unsigned long)i * 8UL;
+		upa_writeq(0, dram);
+		upa_writeq(0, tag);
+	}
+	upa_readq(iommu->sbus_control_reg);
+
+	/* Give the TSB to SYSIO. */
+	upa_writeq(__pa(tsb_base), iommu->iommu_regs + IOMMU_TSBBASE);
+
+	/* Setup streaming buffer, DE=1 SB_EN=1 */
+	control = (1UL << 1UL) | (1UL << 0UL);
+	upa_writeq(control, iommu->strbuf_regs + STRBUF_CONTROL);
+
+	/* Clear out the tags using diagnostics. */
+	for (i = 0; i < 16; i++) {
+		unsigned long ptag, ltag;
+
+		ptag = iommu->strbuf_regs + STRBUF_PTAGDIAG;
+		ltag = iommu->strbuf_regs + STRBUF_LTAGDIAG;
+		ptag += (unsigned long)i * 8UL;
+		ltag += (unsigned long)i * 8UL;
+
+		upa_writeq(0UL, ptag);
+		upa_writeq(0UL, ltag);
+	}
+
+	/* Enable DVMA arbitration for all devices/slots. */
+	control = upa_readq(iommu->sbus_control_reg);
+	control |= 0x3fUL;
+	upa_writeq(control, iommu->sbus_control_reg);
+
+	/* Now some Xfire specific grot... */
+	if (this_is_starfire)
+		sbus->starfire_cookie = starfire_hookup(sbus->portid);
+	else
+		sbus->starfire_cookie = NULL;
+
+	sysio_register_error_handlers(sbus);
+}