arch/sparc/mm/io-unit.c - kernel/msm-4.9 - Gitiles

 /* $Id: io-unit.c,v 1.24 2001/12/17 07:05:09 davem Exp $
  * io-unit.c:  IO-UNIT specific routines for memory management.
  *
  * Copyright (C) 1997,1998 Jakub Jelinek    (jj@sunsite.mff.cuni.cz)
  */

 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/slab.h>
 #include <linux/spinlock.h>
 #include <linux/mm.h>
 #include <linux/highmem.h>	/* pte_offset_map => kmap_atomic */
 #include <linux/bitops.h>

 #include <asm/scatterlist.h>
 #include <asm/pgalloc.h>
 #include <asm/pgtable.h>
 #include <asm/sbus.h>
 #include <asm/io.h>
 #include <asm/io-unit.h>
 #include <asm/mxcc.h>
 #include <asm/cacheflush.h>
 #include <asm/tlbflush.h>
 #include <asm/dma.h>

 /* #define IOUNIT_DEBUG */
 #ifdef IOUNIT_DEBUG
 #define IOD(x) printk(x)
 #else
 #define IOD(x) do { } while (0)
 #endif

 #define IOPERM        (IOUPTE_CACHE | IOUPTE_WRITE | IOUPTE_VALID)
 #define MKIOPTE(phys) __iopte((((phys)>>4) & IOUPTE_PAGE) | IOPERM)

 void __init
 iounit_init(int sbi_node, int io_node, struct sbus_bus *sbus)
 {
 	iopte_t *xpt, *xptend;
 	struct iounit_struct *iounit;
 	struct linux_prom_registers iommu_promregs[PROMREG_MAX];
 	struct resource r;

 	iounit = kmalloc(sizeof(struct iounit_struct), GFP_ATOMIC);

 	memset(iounit, 0, sizeof(*iounit));
 	iounit->limit[0] = IOUNIT_BMAP1_START;
 	iounit->limit[1] = IOUNIT_BMAP2_START;
 	iounit->limit[2] = IOUNIT_BMAPM_START;
 	iounit->limit[3] = IOUNIT_BMAPM_END;
 	iounit->rotor[1] = IOUNIT_BMAP2_START;
 	iounit->rotor[2] = IOUNIT_BMAPM_START;

 	xpt = NULL;
 	if(prom_getproperty(sbi_node, "reg", (void *) iommu_promregs,
 			    sizeof(iommu_promregs)) != -1) {
 		prom_apply_generic_ranges(io_node, 0, iommu_promregs, 3);
 		memset(&r, 0, sizeof(r));
 		r.flags = iommu_promregs[2].which_io;
 		r.start = iommu_promregs[2].phys_addr;
 		xpt = (iopte_t *) sbus_ioremap(&r, 0, PAGE_SIZE * 16, "XPT");
 	}
 	if(!xpt) panic("Cannot map External Page Table.");

 	sbus->iommu = (struct iommu_struct *)iounit;
 	iounit->page_table = xpt;
 	spin_lock_init(&iounit->lock);

 	for (xptend = iounit->page_table + (16 * PAGE_SIZE) / sizeof(iopte_t);
 	     xpt < xptend;)
 	     	iopte_val(*xpt++) = 0;
 }

 /* One has to hold iounit->lock to call this */
 static unsigned long iounit_get_area(struct iounit_struct *iounit, unsigned long vaddr, int size)
 {
 	int i, j, k, npages;
 	unsigned long rotor, scan, limit;
 	iopte_t iopte;

         npages = ((vaddr & ~PAGE_MASK) + size + (PAGE_SIZE-1)) >> PAGE_SHIFT;

 	/* A tiny bit of magic ingredience :) */
 	switch (npages) {
 	case 1: i = 0x0231; break;
 	case 2: i = 0x0132; break;
 	default: i = 0x0213; break;
 	}

 	IOD(("iounit_get_area(%08lx,%d[%d])=", vaddr, size, npages));

 next:	j = (i & 15);
 	rotor = iounit->rotor[j - 1];
 	limit = iounit->limit[j];
 	scan = rotor;
 nexti:	scan = find_next_zero_bit(iounit->bmap, limit, scan);
 	if (scan + npages > limit) {
 		if (limit != rotor) {
 			limit = rotor;
 			scan = iounit->limit[j - 1];
 			goto nexti;
 		}
 		i >>= 4;
 		if (!(i & 15))
 			panic("iounit_get_area: Couldn't find free iopte slots for (%08lx,%d)\n", vaddr, size);
 		goto next;
 	}
 	for (k = 1, scan++; k < npages; k++)
 		if (test_bit(scan++, iounit->bmap))
 			goto nexti;
 	iounit->rotor[j - 1] = (scan < limit) ? scan : iounit->limit[j - 1];
 	scan -= npages;
 	iopte = MKIOPTE(__pa(vaddr & PAGE_MASK));
 	vaddr = IOUNIT_DMA_BASE + (scan << PAGE_SHIFT) + (vaddr & ~PAGE_MASK);
 	for (k = 0; k < npages; k++, iopte = __iopte(iopte_val(iopte) + 0x100), scan++) {
 		set_bit(scan, iounit->bmap);
 		iounit->page_table[scan] = iopte;
 	}
 	IOD(("%08lx\n", vaddr));
 	return vaddr;
 }

 static __u32 iounit_get_scsi_one(char *vaddr, unsigned long len, struct sbus_bus *sbus)
 {
 	unsigned long ret, flags;
 	struct iounit_struct *iounit = (struct iounit_struct *)sbus->iommu;

 	spin_lock_irqsave(&iounit->lock, flags);
 	ret = iounit_get_area(iounit, (unsigned long)vaddr, len);
 	spin_unlock_irqrestore(&iounit->lock, flags);
 	return ret;
 }

 static void iounit_get_scsi_sgl(struct scatterlist *sg, int sz, struct sbus_bus *sbus)
 {
 	unsigned long flags;
 	struct iounit_struct *iounit = (struct iounit_struct *)sbus->iommu;

 	/* FIXME: Cache some resolved pages - often several sg entries are to the same page */
 	spin_lock_irqsave(&iounit->lock, flags);
 	while (sz != 0) {
 		--sz;
 		sg[sz].dvma_address = iounit_get_area(iounit, (unsigned long)page_address(sg[sz].page) + sg[sz].offset, sg[sz].length);
 		sg[sz].dvma_length = sg[sz].length;
 	}
 	spin_unlock_irqrestore(&iounit->lock, flags);
 }

 static void iounit_release_scsi_one(__u32 vaddr, unsigned long len, struct sbus_bus *sbus)
 {
 	unsigned long flags;
 	struct iounit_struct *iounit = (struct iounit_struct *)sbus->iommu;

 	spin_lock_irqsave(&iounit->lock, flags);
 	len = ((vaddr & ~PAGE_MASK) + len + (PAGE_SIZE-1)) >> PAGE_SHIFT;
 	vaddr = (vaddr - IOUNIT_DMA_BASE) >> PAGE_SHIFT;
 	IOD(("iounit_release %08lx-%08lx\n", (long)vaddr, (long)len+vaddr));
 	for (len += vaddr; vaddr < len; vaddr++)
 		clear_bit(vaddr, iounit->bmap);
 	spin_unlock_irqrestore(&iounit->lock, flags);
 }

 static void iounit_release_scsi_sgl(struct scatterlist *sg, int sz, struct sbus_bus *sbus)
 {
 	unsigned long flags;
 	unsigned long vaddr, len;
 	struct iounit_struct *iounit = (struct iounit_struct *)sbus->iommu;

 	spin_lock_irqsave(&iounit->lock, flags);
 	while (sz != 0) {
 		--sz;
 		len = ((sg[sz].dvma_address & ~PAGE_MASK) + sg[sz].length + (PAGE_SIZE-1)) >> PAGE_SHIFT;
 		vaddr = (sg[sz].dvma_address - IOUNIT_DMA_BASE) >> PAGE_SHIFT;
 		IOD(("iounit_release %08lx-%08lx\n", (long)vaddr, (long)len+vaddr));
 		for (len += vaddr; vaddr < len; vaddr++)
 			clear_bit(vaddr, iounit->bmap);
 	}
 	spin_unlock_irqrestore(&iounit->lock, flags);
 }

 #ifdef CONFIG_SBUS
 static int iounit_map_dma_area(dma_addr_t *pba, unsigned long va, __u32 addr, int len)
 {
 	unsigned long page, end;
 	pgprot_t dvma_prot;
 	iopte_t *iopte;
 	struct sbus_bus *sbus;

 	*pba = addr;

 	dvma_prot = __pgprot(SRMMU_CACHE | SRMMU_ET_PTE | SRMMU_PRIV);
 	end = PAGE_ALIGN((addr + len));
 	while(addr < end) {
 		page = va;
 		{
 			pgd_t *pgdp;
 			pmd_t *pmdp;
 			pte_t *ptep;
 			long i;

 			pgdp = pgd_offset(&init_mm, addr);
 			pmdp = pmd_offset(pgdp, addr);
 			ptep = pte_offset_map(pmdp, addr);

 			set_pte(ptep, mk_pte(virt_to_page(page), dvma_prot));

 			i = ((addr - IOUNIT_DMA_BASE) >> PAGE_SHIFT);

 			for_each_sbus(sbus) {
 				struct iounit_struct *iounit = (struct iounit_struct *)sbus->iommu;

 				iopte = (iopte_t *)(iounit->page_table + i);
 				*iopte = MKIOPTE(__pa(page));
 			}
 		}
 		addr += PAGE_SIZE;
 		va += PAGE_SIZE;
 	}
 	flush_cache_all();
 	flush_tlb_all();

 	return 0;
 }

 static void iounit_unmap_dma_area(unsigned long addr, int len)
 {
 	/* XXX Somebody please fill this in */
 }

 /* XXX We do not pass sbus device here, bad. */
 static struct page *iounit_translate_dvma(unsigned long addr)
 {
 	struct sbus_bus *sbus = sbus_root;	/* They are all the same */
 	struct iounit_struct *iounit = (struct iounit_struct *)sbus->iommu;
 	int i;
 	iopte_t *iopte;

 	i = ((addr - IOUNIT_DMA_BASE) >> PAGE_SHIFT);
 	iopte = (iopte_t *)(iounit->page_table + i);
 	return pfn_to_page(iopte_val(*iopte) >> (PAGE_SHIFT-4)); /* XXX sun4d guru, help */
 }
 #endif

 static char *iounit_lockarea(char *vaddr, unsigned long len)
 {
 /* FIXME: Write this */
 	return vaddr;
 }

 static void iounit_unlockarea(char *vaddr, unsigned long len)
 {
 /* FIXME: Write this */
 }

 void __init ld_mmu_iounit(void)
 {
 	BTFIXUPSET_CALL(mmu_lockarea, iounit_lockarea, BTFIXUPCALL_RETO0);
 	BTFIXUPSET_CALL(mmu_unlockarea, iounit_unlockarea, BTFIXUPCALL_NOP);

 	BTFIXUPSET_CALL(mmu_get_scsi_one, iounit_get_scsi_one, BTFIXUPCALL_NORM);
 	BTFIXUPSET_CALL(mmu_get_scsi_sgl, iounit_get_scsi_sgl, BTFIXUPCALL_NORM);
 	BTFIXUPSET_CALL(mmu_release_scsi_one, iounit_release_scsi_one, BTFIXUPCALL_NORM);
 	BTFIXUPSET_CALL(mmu_release_scsi_sgl, iounit_release_scsi_sgl, BTFIXUPCALL_NORM);

 #ifdef CONFIG_SBUS
 	BTFIXUPSET_CALL(mmu_map_dma_area, iounit_map_dma_area, BTFIXUPCALL_NORM);
 	BTFIXUPSET_CALL(mmu_unmap_dma_area, iounit_unmap_dma_area, BTFIXUPCALL_NORM);
 	BTFIXUPSET_CALL(mmu_translate_dvma, iounit_translate_dvma, BTFIXUPCALL_NORM);
 #endif
 }

 __u32 iounit_map_dma_init(struct sbus_bus *sbus, int size)
 {
 	int i, j, k, npages;
 	unsigned long rotor, scan, limit;
 	unsigned long flags;
 	__u32 ret;
 	struct iounit_struct *iounit = (struct iounit_struct *)sbus->iommu;

         npages = (size + (PAGE_SIZE-1)) >> PAGE_SHIFT;
 	i = 0x0213;
 	spin_lock_irqsave(&iounit->lock, flags);
 next:	j = (i & 15);
 	rotor = iounit->rotor[j - 1];
 	limit = iounit->limit[j];
 	scan = rotor;
 nexti:	scan = find_next_zero_bit(iounit->bmap, limit, scan);
 	if (scan + npages > limit) {
 		if (limit != rotor) {
 			limit = rotor;
 			scan = iounit->limit[j - 1];
 			goto nexti;
 		}
 		i >>= 4;
 		if (!(i & 15))
 			panic("iounit_map_dma_init: Couldn't find free iopte slots for %d bytes\n", size);
 		goto next;
 	}
 	for (k = 1, scan++; k < npages; k++)
 		if (test_bit(scan++, iounit->bmap))
 			goto nexti;
 	iounit->rotor[j - 1] = (scan < limit) ? scan : iounit->limit[j - 1];
 	scan -= npages;
 	ret = IOUNIT_DMA_BASE + (scan << PAGE_SHIFT);
 	for (k = 0; k < npages; k++, scan++)
 		set_bit(scan, iounit->bmap);
 	spin_unlock_irqrestore(&iounit->lock, flags);
 	return ret;
 }

 __u32 iounit_map_dma_page(__u32 vaddr, void *addr, struct sbus_bus *sbus)
 {
 	int scan = (vaddr - IOUNIT_DMA_BASE) >> PAGE_SHIFT;
 	struct iounit_struct *iounit = (struct iounit_struct *)sbus->iommu;

 	iounit->page_table[scan] = MKIOPTE(__pa(((unsigned long)addr) & PAGE_MASK));
 	return vaddr + (((unsigned long)addr) & ~PAGE_MASK);
 }
	/* $Id: io-unit.c,v 1.24 2001/12/17 07:05:09 davem Exp $
	* io-unit.c: IO-UNIT specific routines for memory management.
	*
	* Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
	*/

	#include <linux/kernel.h>
	#include <linux/init.h>
	#include <linux/slab.h>
	#include <linux/spinlock.h>
	#include <linux/mm.h>
	#include <linux/highmem.h> /* pte_offset_map => kmap_atomic */
	#include <linux/bitops.h>

	#include <asm/scatterlist.h>
	#include <asm/pgalloc.h>
	#include <asm/pgtable.h>
	#include <asm/sbus.h>
	#include <asm/io.h>
	#include <asm/io-unit.h>
	#include <asm/mxcc.h>
	#include <asm/cacheflush.h>
	#include <asm/tlbflush.h>
	#include <asm/dma.h>

	/* #define IOUNIT_DEBUG */
	#ifdef IOUNIT_DEBUG
	#define IOD(x) printk(x)
	#else
	#define IOD(x) do { } while (0)
	#endif

	#define IOPERM (IOUPTE_CACHE \| IOUPTE_WRITE \| IOUPTE_VALID)
	#define MKIOPTE(phys) __iopte((((phys)>>4) & IOUPTE_PAGE) \| IOPERM)

	void __init
	iounit_init(int sbi_node, int io_node, struct sbus_bus *sbus)
	{
	iopte_t xpt, xptend;
	struct iounit_struct *iounit;
	struct linux_prom_registers iommu_promregs[PROMREG_MAX];
	struct resource r;

	iounit = kmalloc(sizeof(struct iounit_struct), GFP_ATOMIC);

	memset(iounit, 0, sizeof(*iounit));
	iounit->limit[0] = IOUNIT_BMAP1_START;
	iounit->limit[1] = IOUNIT_BMAP2_START;
	iounit->limit[2] = IOUNIT_BMAPM_START;
	iounit->limit[3] = IOUNIT_BMAPM_END;
	iounit->rotor[1] = IOUNIT_BMAP2_START;
	iounit->rotor[2] = IOUNIT_BMAPM_START;

	xpt = NULL;
	if(prom_getproperty(sbi_node, "reg", (void *) iommu_promregs,
	sizeof(iommu_promregs)) != -1) {
	prom_apply_generic_ranges(io_node, 0, iommu_promregs, 3);
	memset(&r, 0, sizeof(r));
	r.flags = iommu_promregs[2].which_io;
	r.start = iommu_promregs[2].phys_addr;
	xpt = (iopte_t ) sbus_ioremap(&r, 0, PAGE_SIZE 16, "XPT");
	}
	if(!xpt) panic("Cannot map External Page Table.");

	sbus->iommu = (struct iommu_struct *)iounit;
	iounit->page_table = xpt;
	spin_lock_init(&iounit->lock);

	for (xptend = iounit->page_table + (16 * PAGE_SIZE) / sizeof(iopte_t);
	xpt < xptend;)
	iopte_val(*xpt++) = 0;
	}

	/* One has to hold iounit->lock to call this */
	static unsigned long iounit_get_area(struct iounit_struct *iounit, unsigned long vaddr, int size)
	{
	int i, j, k, npages;
	unsigned long rotor, scan, limit;
	iopte_t iopte;

	npages = ((vaddr & ~PAGE_MASK) + size + (PAGE_SIZE-1)) >> PAGE_SHIFT;

	/* A tiny bit of magic ingredience :) */
	switch (npages) {
	case 1: i = 0x0231; break;
	case 2: i = 0x0132; break;
	default: i = 0x0213; break;
	}

	IOD(("iounit_get_area(%08lx,%d[%d])=", vaddr, size, npages));

	next: j = (i & 15);
	rotor = iounit->rotor[j - 1];
	limit = iounit->limit[j];
	scan = rotor;
	nexti: scan = find_next_zero_bit(iounit->bmap, limit, scan);
	if (scan + npages > limit) {
	if (limit != rotor) {
	limit = rotor;
	scan = iounit->limit[j - 1];
	goto nexti;
	}
	i >>= 4;
	if (!(i & 15))
	panic("iounit_get_area: Couldn't find free iopte slots for (%08lx,%d)\n", vaddr, size);
	goto next;
	}
	for (k = 1, scan++; k < npages; k++)
	if (test_bit(scan++, iounit->bmap))
	goto nexti;
	iounit->rotor[j - 1] = (scan < limit) ? scan : iounit->limit[j - 1];
	scan -= npages;
	iopte = MKIOPTE(__pa(vaddr & PAGE_MASK));
	vaddr = IOUNIT_DMA_BASE + (scan << PAGE_SHIFT) + (vaddr & ~PAGE_MASK);
	for (k = 0; k < npages; k++, iopte = __iopte(iopte_val(iopte) + 0x100), scan++) {
	set_bit(scan, iounit->bmap);
	iounit->page_table[scan] = iopte;
	}
	IOD(("%08lx\n", vaddr));
	return vaddr;
	}

	static __u32 iounit_get_scsi_one(char vaddr, unsigned long len, struct sbus_bus sbus)
	{
	unsigned long ret, flags;
	struct iounit_struct iounit = (struct iounit_struct )sbus->iommu;

	spin_lock_irqsave(&iounit->lock, flags);
	ret = iounit_get_area(iounit, (unsigned long)vaddr, len);
	spin_unlock_irqrestore(&iounit->lock, flags);
	return ret;
	}

	static void iounit_get_scsi_sgl(struct scatterlist sg, int sz, struct sbus_bus sbus)
	{
	unsigned long flags;
	struct iounit_struct iounit = (struct iounit_struct )sbus->iommu;

	/* FIXME: Cache some resolved pages - often several sg entries are to the same page */
	spin_lock_irqsave(&iounit->lock, flags);
	while (sz != 0) {
	--sz;
	sg[sz].dvma_address = iounit_get_area(iounit, (unsigned long)page_address(sg[sz].page) + sg[sz].offset, sg[sz].length);
	sg[sz].dvma_length = sg[sz].length;
	}
	spin_unlock_irqrestore(&iounit->lock, flags);
	}

	static void iounit_release_scsi_one(__u32 vaddr, unsigned long len, struct sbus_bus *sbus)
	{
	unsigned long flags;
	struct iounit_struct iounit = (struct iounit_struct )sbus->iommu;

	spin_lock_irqsave(&iounit->lock, flags);
	len = ((vaddr & ~PAGE_MASK) + len + (PAGE_SIZE-1)) >> PAGE_SHIFT;
	vaddr = (vaddr - IOUNIT_DMA_BASE) >> PAGE_SHIFT;
	IOD(("iounit_release %08lx-%08lx\n", (long)vaddr, (long)len+vaddr));
	for (len += vaddr; vaddr < len; vaddr++)
	clear_bit(vaddr, iounit->bmap);
	spin_unlock_irqrestore(&iounit->lock, flags);
	}

	static void iounit_release_scsi_sgl(struct scatterlist sg, int sz, struct sbus_bus sbus)
	{
	unsigned long flags;
	unsigned long vaddr, len;
	struct iounit_struct iounit = (struct iounit_struct )sbus->iommu;

	spin_lock_irqsave(&iounit->lock, flags);
	while (sz != 0) {
	--sz;
	len = ((sg[sz].dvma_address & ~PAGE_MASK) + sg[sz].length + (PAGE_SIZE-1)) >> PAGE_SHIFT;
	vaddr = (sg[sz].dvma_address - IOUNIT_DMA_BASE) >> PAGE_SHIFT;
	IOD(("iounit_release %08lx-%08lx\n", (long)vaddr, (long)len+vaddr));
	for (len += vaddr; vaddr < len; vaddr++)
	clear_bit(vaddr, iounit->bmap);
	}
	spin_unlock_irqrestore(&iounit->lock, flags);
	}

	#ifdef CONFIG_SBUS
	static int iounit_map_dma_area(dma_addr_t *pba, unsigned long va, __u32 addr, int len)
	{
	unsigned long page, end;
	pgprot_t dvma_prot;
	iopte_t *iopte;
	struct sbus_bus *sbus;

	*pba = addr;

	dvma_prot = __pgprot(SRMMU_CACHE \| SRMMU_ET_PTE \| SRMMU_PRIV);
	end = PAGE_ALIGN((addr + len));
	while(addr < end) {
	page = va;
	{
	pgd_t *pgdp;
	pmd_t *pmdp;
	pte_t *ptep;
	long i;

	pgdp = pgd_offset(&init_mm, addr);
	pmdp = pmd_offset(pgdp, addr);
	ptep = pte_offset_map(pmdp, addr);

	set_pte(ptep, mk_pte(virt_to_page(page), dvma_prot));

	i = ((addr - IOUNIT_DMA_BASE) >> PAGE_SHIFT);

	for_each_sbus(sbus) {
	struct iounit_struct iounit = (struct iounit_struct )sbus->iommu;

	iopte = (iopte_t *)(iounit->page_table + i);
	*iopte = MKIOPTE(__pa(page));
	}
	}
	addr += PAGE_SIZE;
	va += PAGE_SIZE;
	}
	flush_cache_all();
	flush_tlb_all();

	return 0;
	}

	static void iounit_unmap_dma_area(unsigned long addr, int len)
	{
	/* XXX Somebody please fill this in */
	}

	/* XXX We do not pass sbus device here, bad. */
	static struct page *iounit_translate_dvma(unsigned long addr)
	{
	struct sbus_bus sbus = sbus_root; / They are all the same */
	struct iounit_struct iounit = (struct iounit_struct )sbus->iommu;
	int i;
	iopte_t *iopte;

	i = ((addr - IOUNIT_DMA_BASE) >> PAGE_SHIFT);
	iopte = (iopte_t *)(iounit->page_table + i);
	return pfn_to_page(iopte_val(iopte) >> (PAGE_SHIFT-4)); / XXX sun4d guru, help */
	}
	#endif

	static char iounit_lockarea(char vaddr, unsigned long len)
	{
	/* FIXME: Write this */
	return vaddr;
	}

	static void iounit_unlockarea(char *vaddr, unsigned long len)
	{
	/* FIXME: Write this */
	}

	void __init ld_mmu_iounit(void)
	{
	BTFIXUPSET_CALL(mmu_lockarea, iounit_lockarea, BTFIXUPCALL_RETO0);
	BTFIXUPSET_CALL(mmu_unlockarea, iounit_unlockarea, BTFIXUPCALL_NOP);

	BTFIXUPSET_CALL(mmu_get_scsi_one, iounit_get_scsi_one, BTFIXUPCALL_NORM);
	BTFIXUPSET_CALL(mmu_get_scsi_sgl, iounit_get_scsi_sgl, BTFIXUPCALL_NORM);
	BTFIXUPSET_CALL(mmu_release_scsi_one, iounit_release_scsi_one, BTFIXUPCALL_NORM);
	BTFIXUPSET_CALL(mmu_release_scsi_sgl, iounit_release_scsi_sgl, BTFIXUPCALL_NORM);

	#ifdef CONFIG_SBUS
	BTFIXUPSET_CALL(mmu_map_dma_area, iounit_map_dma_area, BTFIXUPCALL_NORM);
	BTFIXUPSET_CALL(mmu_unmap_dma_area, iounit_unmap_dma_area, BTFIXUPCALL_NORM);
	BTFIXUPSET_CALL(mmu_translate_dvma, iounit_translate_dvma, BTFIXUPCALL_NORM);
	#endif
	}

	__u32 iounit_map_dma_init(struct sbus_bus *sbus, int size)
	{
	int i, j, k, npages;
	unsigned long rotor, scan, limit;
	unsigned long flags;
	__u32 ret;
	struct iounit_struct iounit = (struct iounit_struct )sbus->iommu;

	npages = (size + (PAGE_SIZE-1)) >> PAGE_SHIFT;
	i = 0x0213;
	spin_lock_irqsave(&iounit->lock, flags);
	next: j = (i & 15);
	rotor = iounit->rotor[j - 1];
	limit = iounit->limit[j];
	scan = rotor;
	nexti: scan = find_next_zero_bit(iounit->bmap, limit, scan);
	if (scan + npages > limit) {
	if (limit != rotor) {
	limit = rotor;
	scan = iounit->limit[j - 1];
	goto nexti;
	}
	i >>= 4;
	if (!(i & 15))
	panic("iounit_map_dma_init: Couldn't find free iopte slots for %d bytes\n", size);
	goto next;
	}
	for (k = 1, scan++; k < npages; k++)
	if (test_bit(scan++, iounit->bmap))
	goto nexti;
	iounit->rotor[j - 1] = (scan < limit) ? scan : iounit->limit[j - 1];
	scan -= npages;
	ret = IOUNIT_DMA_BASE + (scan << PAGE_SHIFT);
	for (k = 0; k < npages; k++, scan++)
	set_bit(scan, iounit->bmap);
	spin_unlock_irqrestore(&iounit->lock, flags);
	return ret;
	}

	__u32 iounit_map_dma_page(__u32 vaddr, void addr, struct sbus_bus sbus)
	{
	int scan = (vaddr - IOUNIT_DMA_BASE) >> PAGE_SHIFT;
	struct iounit_struct iounit = (struct iounit_struct )sbus->iommu;

	iounit->page_table[scan] = MKIOPTE(__pa(((unsigned long)addr) & PAGE_MASK));
	return vaddr + (((unsigned long)addr) & ~PAGE_MASK);
	}