[deliverable/linux.git] / arch / sparc / mm / io-unit.c

/* $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);
}
Commit	Line	Data
1da177e4 LT	1	/* $Id: io-unit.c,v 1.24 2001/12/17 07:05:09 davem Exp $
	2	* io-unit.c: IO-UNIT specific routines for memory management.
	3	*
	4	* Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
	5	*/
	6
1da177e4 LT	7	#include <linux/kernel.h>
	8	#include <linux/init.h>
	9	#include <linux/slab.h>
	10	#include <linux/spinlock.h>
	11	#include <linux/mm.h>
	12	#include <linux/highmem.h> /* pte_offset_map => kmap_atomic */
	13	#include <linux/bitops.h>
	14
	15	#include <asm/scatterlist.h>
	16	#include <asm/pgalloc.h>
	17	#include <asm/pgtable.h>
	18	#include <asm/sbus.h>
	19	#include <asm/io.h>
	20	#include <asm/io-unit.h>
	21	#include <asm/mxcc.h>
	22	#include <asm/cacheflush.h>
	23	#include <asm/tlbflush.h>
	24	#include <asm/dma.h>
	25
	26	/* #define IOUNIT_DEBUG */
	27	#ifdef IOUNIT_DEBUG
	28	#define IOD(x) printk(x)
	29	#else
	30	#define IOD(x) do { } while (0)
	31	#endif
	32
	33	#define IOPERM (IOUPTE_CACHE \| IOUPTE_WRITE \| IOUPTE_VALID)
	34	#define MKIOPTE(phys) __iopte((((phys)>>4) & IOUPTE_PAGE) \| IOPERM)
	35
	36	void __init
	37	iounit_init(int sbi_node, int io_node, struct sbus_bus *sbus)
	38	{
	39	iopte_t xpt, xptend;
	40	struct iounit_struct *iounit;
	41	struct linux_prom_registers iommu_promregs[PROMREG_MAX];
	42	struct resource r;
	43
	44	iounit = kmalloc(sizeof(struct iounit_struct), GFP_ATOMIC);
	45
	46	memset(iounit, 0, sizeof(*iounit));
	47	iounit->limit[0] = IOUNIT_BMAP1_START;
	48	iounit->limit[1] = IOUNIT_BMAP2_START;
	49	iounit->limit[2] = IOUNIT_BMAPM_START;
	50	iounit->limit[3] = IOUNIT_BMAPM_END;
	51	iounit->rotor[1] = IOUNIT_BMAP2_START;
	52	iounit->rotor[2] = IOUNIT_BMAPM_START;
	53
	54	xpt = NULL;
	55	if(prom_getproperty(sbi_node, "reg", (void *) iommu_promregs,
	56	sizeof(iommu_promregs)) != -1) {
	57	prom_apply_generic_ranges(io_node, 0, iommu_promregs, 3);
	58	memset(&r, 0, sizeof(r));
	59	r.flags = iommu_promregs[2].which_io;
	60	r.start = iommu_promregs[2].phys_addr;
	61	xpt = (iopte_t ) sbus_ioremap(&r, 0, PAGE_SIZE 16, "XPT");
	62	}
	63	if(!xpt) panic("Cannot map External Page Table.");
	64
	65	sbus->iommu = (struct iommu_struct *)iounit;
	66	iounit->page_table = xpt;
2f72ba43	67	spin_lock_init(&iounit->lock);
1da177e4 LT	68
	69	for (xptend = iounit->page_table + (16 * PAGE_SIZE) / sizeof(iopte_t);
	70	xpt < xptend;)
	71	iopte_val(*xpt++) = 0;
	72	}
	73
	74	/* One has to hold iounit->lock to call this */
	75	static unsigned long iounit_get_area(struct iounit_struct *iounit, unsigned long vaddr, int size)
	76	{
	77	int i, j, k, npages;
	78	unsigned long rotor, scan, limit;
	79	iopte_t iopte;
	80
	81	npages = ((vaddr & ~PAGE_MASK) + size + (PAGE_SIZE-1)) >> PAGE_SHIFT;
	82
	83	/* A tiny bit of magic ingredience :) */
	84	switch (npages) {
	85	case 1: i = 0x0231; break;
	86	case 2: i = 0x0132; break;
	87	default: i = 0x0213; break;
	88	}
	89
	90	IOD(("iounit_get_area(%08lx,%d[%d])=", vaddr, size, npages));
	91
	92	next: j = (i & 15);
	93	rotor = iounit->rotor[j - 1];
	94	limit = iounit->limit[j];
	95	scan = rotor;
	96	nexti: scan = find_next_zero_bit(iounit->bmap, limit, scan);
	97	if (scan + npages > limit) {
	98	if (limit != rotor) {
	99	limit = rotor;
	100	scan = iounit->limit[j - 1];
	101	goto nexti;
	102	}
	103	i >>= 4;
	104	if (!(i & 15))
	105	panic("iounit_get_area: Couldn't find free iopte slots for (%08lx,%d)\n", vaddr, size);
	106	goto next;
	107	}
	108	for (k = 1, scan++; k < npages; k++)
	109	if (test_bit(scan++, iounit->bmap))
	110	goto nexti;
	111	iounit->rotor[j - 1] = (scan < limit) ? scan : iounit->limit[j - 1];
	112	scan -= npages;
	113	iopte = MKIOPTE(__pa(vaddr & PAGE_MASK));
	114	vaddr = IOUNIT_DMA_BASE + (scan << PAGE_SHIFT) + (vaddr & ~PAGE_MASK);
	115	for (k = 0; k < npages; k++, iopte = __iopte(iopte_val(iopte) + 0x100), scan++) {
	116	set_bit(scan, iounit->bmap);
	117	iounit->page_table[scan] = iopte;
	118	}
	119	IOD(("%08lx\n", vaddr));
	120	return vaddr;
	121	}
	122
	123	static __u32 iounit_get_scsi_one(char vaddr, unsigned long len, struct sbus_bus sbus)
	124	{
	125	unsigned long ret, flags;
	126	struct iounit_struct iounit = (struct iounit_struct )sbus->iommu;
	127
	128	spin_lock_irqsave(&iounit->lock, flags);
	129	ret = iounit_get_area(iounit, (unsigned long)vaddr, len);
	130	spin_unlock_irqrestore(&iounit->lock, flags);
	131	return ret;
132	}
133
134	static void iounit_get_scsi_sgl(struct scatterlist sg, int sz, struct sbus_bus sbus)
135	{
136	unsigned long flags;
137	struct iounit_struct iounit = (struct iounit_struct )sbus->iommu;
138
139	/* FIXME: Cache some resolved pages - often several sg entries are to the same page */
140	spin_lock_irqsave(&iounit->lock, flags);
141	while (sz != 0) {
142	--sz;
143	sg[sz].dvma_address = iounit_get_area(iounit, (unsigned long)page_address(sg[sz].page) + sg[sz].offset, sg[sz].length);
144	sg[sz].dvma_length = sg[sz].length;
145	}
146	spin_unlock_irqrestore(&iounit->lock, flags);
147	}
148
149	static void iounit_release_scsi_one(__u32 vaddr, unsigned long len, struct sbus_bus *sbus)
150	{
151	unsigned long flags;
152	struct iounit_struct iounit = (struct iounit_struct )sbus->iommu;
153
154	spin_lock_irqsave(&iounit->lock, flags);
155	len = ((vaddr & ~PAGE_MASK) + len + (PAGE_SIZE-1)) >> PAGE_SHIFT;
156	vaddr = (vaddr - IOUNIT_DMA_BASE) >> PAGE_SHIFT;
157	IOD(("iounit_release %08lx-%08lx\n", (long)vaddr, (long)len+vaddr));
158	for (len += vaddr; vaddr < len; vaddr++)
159	clear_bit(vaddr, iounit->bmap);
160	spin_unlock_irqrestore(&iounit->lock, flags);
161	}
162
163	static void iounit_release_scsi_sgl(struct scatterlist sg, int sz, struct sbus_bus sbus)
164	{
165	unsigned long flags;
166	unsigned long vaddr, len;
167	struct iounit_struct iounit = (struct iounit_struct )sbus->iommu;
168
169	spin_lock_irqsave(&iounit->lock, flags);
170	while (sz != 0) {
171	--sz;
172	len = ((sg[sz].dvma_address & ~PAGE_MASK) + sg[sz].length + (PAGE_SIZE-1)) >> PAGE_SHIFT;
173	vaddr = (sg[sz].dvma_address - IOUNIT_DMA_BASE) >> PAGE_SHIFT;
174	IOD(("iounit_release %08lx-%08lx\n", (long)vaddr, (long)len+vaddr));
175	for (len += vaddr; vaddr < len; vaddr++)
176	clear_bit(vaddr, iounit->bmap);
177	}
178	spin_unlock_irqrestore(&iounit->lock, flags);
179	}
180
181	#ifdef CONFIG_SBUS
182	static int iounit_map_dma_area(dma_addr_t *pba, unsigned long va, __u32 addr, int len)
183	{
184	unsigned long page, end;
185	pgprot_t dvma_prot;
186	iopte_t *iopte;
187	struct sbus_bus *sbus;
188
189	*pba = addr;
190
191	dvma_prot = __pgprot(SRMMU_CACHE \| SRMMU_ET_PTE \| SRMMU_PRIV);
192	end = PAGE_ALIGN((addr + len));
193	while(addr < end) {
194	page = va;
195	{
196	pgd_t *pgdp;
197	pmd_t *pmdp;
198	pte_t *ptep;
199	long i;
200
201	pgdp = pgd_offset(&init_mm, addr);
202	pmdp = pmd_offset(pgdp, addr);
203	ptep = pte_offset_map(pmdp, addr);
204
205	set_pte(ptep, mk_pte(virt_to_page(page), dvma_prot));
206
207	i = ((addr - IOUNIT_DMA_BASE) >> PAGE_SHIFT);
208
209	for_each_sbus(sbus) {
210	struct iounit_struct iounit = (struct iounit_struct )sbus->iommu;
211
212	iopte = (iopte_t *)(iounit->page_table + i);
213	*iopte = MKIOPTE(__pa(page));
214	}
215	}
216	addr += PAGE_SIZE;
217	va += PAGE_SIZE;
218	}
219	flush_cache_all();
220	flush_tlb_all();
221
222	return 0;
223	}
224
225	static void iounit_unmap_dma_area(unsigned long addr, int len)
226	{
227	/* XXX Somebody please fill this in */
228	}
229
230	/* XXX We do not pass sbus device here, bad. */
231	static struct page *iounit_translate_dvma(unsigned long addr)
232	{
233	struct sbus_bus sbus = sbus_root; / They are all the same */
234	struct iounit_struct iounit = (struct iounit_struct )sbus->iommu;
235	int i;
236	iopte_t *iopte;
237
238	i = ((addr - IOUNIT_DMA_BASE) >> PAGE_SHIFT);
239	iopte = (iopte_t *)(iounit->page_table + i);
240	return pfn_to_page(iopte_val(iopte) >> (PAGE_SHIFT-4)); / XXX sun4d guru, help */
241	}
242	#endif
243
244	static char iounit_lockarea(char vaddr, unsigned long len)
245	{
246	/* FIXME: Write this */
247	return vaddr;
248	}
249
250	static void iounit_unlockarea(char *vaddr, unsigned long len)
251	{
252	/* FIXME: Write this */
253	}
254
255	void __init ld_mmu_iounit(void)
256	{
257	BTFIXUPSET_CALL(mmu_lockarea, iounit_lockarea, BTFIXUPCALL_RETO0);
258	BTFIXUPSET_CALL(mmu_unlockarea, iounit_unlockarea, BTFIXUPCALL_NOP);
259
260	BTFIXUPSET_CALL(mmu_get_scsi_one, iounit_get_scsi_one, BTFIXUPCALL_NORM);
261	BTFIXUPSET_CALL(mmu_get_scsi_sgl, iounit_get_scsi_sgl, BTFIXUPCALL_NORM);
262	BTFIXUPSET_CALL(mmu_release_scsi_one, iounit_release_scsi_one, BTFIXUPCALL_NORM);
263	BTFIXUPSET_CALL(mmu_release_scsi_sgl, iounit_release_scsi_sgl, BTFIXUPCALL_NORM);
264
265	#ifdef CONFIG_SBUS
266	BTFIXUPSET_CALL(mmu_map_dma_area, iounit_map_dma_area, BTFIXUPCALL_NORM);
267	BTFIXUPSET_CALL(mmu_unmap_dma_area, iounit_unmap_dma_area, BTFIXUPCALL_NORM);
268	BTFIXUPSET_CALL(mmu_translate_dvma, iounit_translate_dvma, BTFIXUPCALL_NORM);
269	#endif
270	}
271
272	__u32 iounit_map_dma_init(struct sbus_bus *sbus, int size)
273	{
274	int i, j, k, npages;
275	unsigned long rotor, scan, limit;
276	unsigned long flags;
277	__u32 ret;
278	struct iounit_struct iounit = (struct iounit_struct )sbus->iommu;
279
280	npages = (size + (PAGE_SIZE-1)) >> PAGE_SHIFT;
281	i = 0x0213;
282	spin_lock_irqsave(&iounit->lock, flags);
283	next: j = (i & 15);
284	rotor = iounit->rotor[j - 1];
285	limit = iounit->limit[j];
286	scan = rotor;
287	nexti: scan = find_next_zero_bit(iounit->bmap, limit, scan);
288	if (scan + npages > limit) {
289	if (limit != rotor) {
290	limit = rotor;
291	scan = iounit->limit[j - 1];
292	goto nexti;
293	}
294	i >>= 4;
295	if (!(i & 15))
296	panic("iounit_map_dma_init: Couldn't find free iopte slots for %d bytes\n", size);
297	goto next;
298	}
299	for (k = 1, scan++; k < npages; k++)
300	if (test_bit(scan++, iounit->bmap))
301	goto nexti;
302	iounit->rotor[j - 1] = (scan < limit) ? scan : iounit->limit[j - 1];
303	scan -= npages;
304	ret = IOUNIT_DMA_BASE + (scan << PAGE_SHIFT);
305	for (k = 0; k < npages; k++, scan++)
306	set_bit(scan, iounit->bmap);
307	spin_unlock_irqrestore(&iounit->lock, flags);
308	return ret;
309	}
310
311	__u32 iounit_map_dma_page(__u32 vaddr, void addr, struct sbus_bus sbus)
312	{
313	int scan = (vaddr - IOUNIT_DMA_BASE) >> PAGE_SHIFT;
314	struct iounit_struct iounit = (struct iounit_struct )sbus->iommu;
315
316	iounit->page_table[scan] = MKIOPTE(__pa(((unsigned long)addr) & PAGE_MASK));
317	return vaddr + (((unsigned long)addr) & ~PAGE_MASK);
318	}