#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_arena {
+ unsigned long *map;
+ unsigned int hint;
+ unsigned int limit;
+};
+
struct sbus_iommu {
-/*0x00*/spinlock_t lock;
+ spinlock_t lock;
-/*0x08*/iopte_t *page_table;
-/*0x10*/unsigned long strbuf_regs;
-/*0x18*/unsigned long iommu_regs;
-/*0x20*/unsigned long sbus_control_reg;
+ struct sbus_iommu_arena arena;
-/*0x28*/volatile unsigned long strbuf_flushflag;
+ iopte_t *page_table;
+ unsigned long strbuf_regs;
+ unsigned long iommu_regs;
+ unsigned long sbus_control_reg;
- /* 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;
+ volatile unsigned long strbuf_flushflag;
};
/* Offsets from iommu_regs */
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 */
base, npages);
}
-static iopte_t *alloc_streaming_cluster(struct sbus_iommu *iommu, unsigned long npages)
+/* Based largely upon the ppc64 iommu allocator. */
+static long sbus_arena_alloc(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;
+ struct sbus_iommu_arena *arena = &iommu->arena;
+ unsigned long n, i, start, end, limit;
+ int pass;
+
+ limit = arena->limit;
+ start = arena->hint;
+ pass = 0;
+
+again:
+ n = find_next_zero_bit(arena->map, limit, start);
+ end = n + npages;
+ if (unlikely(end >= limit)) {
+ if (likely(pass < 1)) {
+ limit = start;
+ start = 0;
+ __iommu_flushall(iommu);
+ pass++;
+ goto again;
} else {
- /* Used cluster in the way */
- cluster = NULL;
- found = 0;
+ /* Scanned the whole thing, give up. */
+ return -1;
}
+ }
- 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;
+ for (i = n; i < end; i++) {
+ if (test_bit(i, arena->map)) {
+ start = i + 1;
+ goto again;
}
- 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;
+ for (i = n; i < end; i++)
+ __set_bit(i, arena->map);
+
+ arena->hint = end;
+
+ return n;
}
-static void free_streaming_cluster(struct sbus_iommu *iommu, u32 base, unsigned long npages)
+static void sbus_arena_free(struct sbus_iommu_arena *arena, unsigned long base, unsigned long npages)
{
- unsigned long cnum, ent, nent;
- iopte_t *iopte;
+ unsigned long i;
- 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
+ for (i = base; i < (base + npages); i++)
+ __clear_bit(i, arena->map);
}
-/* We allocate consistent mappings from the end of cluster zero. */
-static iopte_t *alloc_consistent_cluster(struct sbus_iommu *iommu, unsigned long npages)
+static void sbus_iommu_table_init(struct sbus_iommu *iommu, unsigned int tsbsize)
{
- iopte_t *iopte;
+ unsigned long tsbbase, order, sz, num_tsb_entries;
- iopte = iommu->page_table + (1 * CLUSTER_NPAGES);
- while (iopte > iommu->page_table) {
- iopte--;
- if (!(iopte_val(*iopte) & IOPTE_VALID)) {
- unsigned long tmp = npages;
+ num_tsb_entries = tsbsize / sizeof(iopte_t);
- while (--tmp) {
- iopte--;
- if (iopte_val(*iopte) & IOPTE_VALID)
- break;
- }
- if (tmp == 0) {
- u32 entry = (iopte - iommu->page_table);
+ /* Setup initial software IOMMU state. */
+ spin_lock_init(&iommu->lock);
- if (entry < iommu->lowest_consistent_map)
- iommu->lowest_consistent_map = entry;
- return iopte;
- }
- }
+ /* Allocate and initialize the free area map. */
+ sz = num_tsb_entries / 8;
+ sz = (sz + 7UL) & ~7UL;
+ iommu->arena.map = kzalloc(sz, GFP_KERNEL);
+ if (!iommu->arena.map) {
+ prom_printf("PCI_IOMMU: Error, kmalloc(arena.map) failed.\n");
+ prom_halt();
+ }
+ iommu->arena.limit = num_tsb_entries;
+
+ /* Now allocate and setup the IOMMU page table itself. */
+ order = get_order(tsbsize);
+ tsbbase = __get_free_pages(GFP_KERNEL, order);
+ if (!tsbbase) {
+ prom_printf("IOMMU: Error, gfp(tsb) failed.\n");
+ prom_halt();
}
- return NULL;
+ iommu->page_table = (iopte_t *)tsbbase;
+ memset(iommu->page_table, 0, tsbsize);
}
-static void free_consistent_cluster(struct sbus_iommu *iommu, u32 base, unsigned long npages)
+static inline iopte_t *alloc_npages(struct sbus_iommu *iommu, unsigned long npages)
{
- iopte_t *iopte = iommu->page_table + ((base - MAP_BASE) >> IO_PAGE_SHIFT);
+ long entry;
- if ((iopte - iommu->page_table) == iommu->lowest_consistent_map) {
- iopte_t *walk = iopte + npages;
- iopte_t *limit;
+ entry = sbus_arena_alloc(iommu, npages);
+ if (unlikely(entry < 0))
+ return NULL;
- limit = iommu->page_table + CLUSTER_NPAGES;
- while (walk < limit) {
- if (iopte_val(*walk) != 0UL)
- break;
- walk++;
- }
- iommu->lowest_consistent_map =
- (walk - iommu->page_table);
- }
+ return iommu->page_table + entry;
+}
- while (npages--)
- *iopte++ = __iopte(0UL);
+static inline void free_npages(struct sbus_iommu *iommu, dma_addr_t base, unsigned long npages)
+{
+ sbus_arena_free(&iommu->arena, base >> IO_PAGE_SHIFT, npages);
}
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;
+ unsigned long flags, order, first_page;
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|__GFP_COMP, order);
if (first_page == 0UL)
return NULL;
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);
+ iopte = alloc_npages(iommu, size >> IO_PAGE_SHIFT);
+ spin_unlock_irqrestore(&iommu->lock, flags);
+
+ if (unlikely(iopte == NULL)) {
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);
+ *dvma_addr = (MAP_BASE +
+ ((iopte - iommu->page_table) << IO_PAGE_SHIFT));
ret = (void *) first_page;
npages = size >> IO_PAGE_SHIFT;
+ first_page = __pa(first_page);
while (npages--) {
- *iopte++ = __iopte(IOPTE_VALID | IOPTE_CACHE | IOPTE_WRITE |
- (__pa(first_page) & IOPTE_PAGE));
+ iopte_val(*iopte) = (IOPTE_VALID | IOPTE_CACHE |
+ IOPTE_WRITE |
+ (first_page & IOPTE_PAGE));
+ iopte++;
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;
+ iopte_t *iopte;
+ unsigned long flags, order, npages;
npages = IO_PAGE_ALIGN(size) >> IO_PAGE_SHIFT;
iommu = sdev->bus->iommu;
+ iopte = iommu->page_table +
+ ((dvma - MAP_BASE) >> IO_PAGE_SHIFT);
+
+ spin_lock_irqsave(&iommu->lock, flags);
+
+ free_npages(iommu, dvma - MAP_BASE, npages);
- spin_lock_irq(&iommu->lock);
- free_consistent_cluster(iommu, dvma, npages);
- iommu_flush(iommu, dvma, npages);
- spin_unlock_irq(&iommu->lock);
+ spin_unlock_irqrestore(&iommu->lock, flags);
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)
+dma_addr_t sbus_map_single(struct sbus_dev *sdev, void *ptr, size_t sz, int direction)
{
- struct sbus_iommu *iommu = sdev->bus->iommu;
- unsigned long npages, pbase, flags;
- iopte_t *iopte;
- u32 dma_base, offset;
- unsigned long iopte_bits;
+ struct sbus_iommu *iommu;
+ iopte_t *base;
+ unsigned long flags, npages, oaddr;
+ unsigned long i, base_paddr;
+ u32 bus_addr, ret;
+ unsigned long iopte_protection;
+
+ iommu = sdev->bus->iommu;
- if (dir == SBUS_DMA_NONE)
+ if (unlikely(direction == 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);
+ oaddr = (unsigned long)ptr;
+ npages = IO_PAGE_ALIGN(oaddr + sz) - (oaddr & IO_PAGE_MASK);
+ npages >>= IO_PAGE_SHIFT;
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;
+ base = alloc_npages(iommu, npages);
spin_unlock_irqrestore(&iommu->lock, flags);
- return (dma_base | offset);
+ if (unlikely(!base))
+ BUG();
-bad:
- spin_unlock_irqrestore(&iommu->lock, flags);
- BUG();
- return 0;
+ bus_addr = (MAP_BASE +
+ ((base - iommu->page_table) << IO_PAGE_SHIFT));
+ ret = bus_addr | (oaddr & ~IO_PAGE_MASK);
+ base_paddr = __pa(oaddr & IO_PAGE_MASK);
+
+ iopte_protection = IOPTE_VALID | IOPTE_STBUF | IOPTE_CACHE;
+ if (direction != SBUS_DMA_TODEVICE)
+ iopte_protection |= IOPTE_WRITE;
+
+ for (i = 0; i < npages; i++, base++, base_paddr += IO_PAGE_SIZE)
+ iopte_val(*base) = iopte_protection | base_paddr;
+
+ return ret;
}
-void sbus_unmap_single(struct sbus_dev *sdev, dma_addr_t dma_addr, size_t size, int direction)
+void sbus_unmap_single(struct sbus_dev *sdev, dma_addr_t bus_addr, size_t sz, int direction)
{
struct sbus_iommu *iommu = sdev->bus->iommu;
- u32 dma_base = dma_addr & IO_PAGE_MASK;
- unsigned long flags;
+ iopte_t *base;
+ unsigned long flags, npages, i;
+
+ if (unlikely(direction == SBUS_DMA_NONE))
+ BUG();
+
+ npages = IO_PAGE_ALIGN(bus_addr + sz) - (bus_addr & IO_PAGE_MASK);
+ npages >>= IO_PAGE_SHIFT;
+ base = iommu->page_table +
+ ((bus_addr - MAP_BASE) >> IO_PAGE_SHIFT);
- size = (IO_PAGE_ALIGN(dma_addr + size) - dma_base);
+ bus_addr &= IO_PAGE_MASK;
spin_lock_irqsave(&iommu->lock, flags);
- free_streaming_cluster(iommu, dma_base, size >> IO_PAGE_SHIFT);
- sbus_strbuf_flush(iommu, dma_base, size >> IO_PAGE_SHIFT, direction);
+ sbus_strbuf_flush(iommu, bus_addr, npages, direction);
+ for (i = 0; i < npages; i++)
+ iopte_val(base[i]) = 0UL;
+ free_npages(iommu, bus_addr - MAP_BASE, npages);
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)
+static inline void fill_sg(iopte_t *iopte, struct scatterlist *sg,
+ int nused, int nelems, unsigned long iopte_protection)
{
struct scatterlist *dma_sg = sg;
struct scatterlist *sg_end = sg + nelems;
for (;;) {
unsigned long tmp;
- tmp = (unsigned long) SG_ENT_PHYS_ADDRESS(sg);
+ tmp = SG_ENT_PHYS_ADDRESS(sg);
len = sg->length;
if (((tmp ^ pteval) >> IO_PAGE_SHIFT) != 0UL) {
pteval = tmp & IO_PAGE_MASK;
sg++;
}
- pteval = ((pteval & IOPTE_PAGE) | iopte_bits);
+ pteval = iopte_protection | (pteval & IOPTE_PAGE);
while (len > 0) {
*iopte++ = __iopte(pteval);
pteval += IO_PAGE_SIZE;
}
}
-int sbus_map_sg(struct sbus_dev *sdev, struct scatterlist *sg, int nents, int dir)
+int sbus_map_sg(struct sbus_dev *sdev, struct scatterlist *sglist, int nelems, int direction)
{
- struct sbus_iommu *iommu = sdev->bus->iommu;
- unsigned long flags, npages;
- iopte_t *iopte;
+ struct sbus_iommu *iommu;
+ unsigned long flags, npages, iopte_protection;
+ iopte_t *base;
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 =
+ if (nelems == 1) {
+ sglist->dma_address =
sbus_map_single(sdev,
- (page_address(sg->page) + sg->offset),
- sg->length, dir);
- sg->dma_length = sg->length;
+ (page_address(sglist->page) + sglist->offset),
+ sglist->length, direction);
+ sglist->dma_length = sglist->length;
return 1;
}
- npages = prepare_sg(sg, nents);
+ iommu = sdev->bus->iommu;
+
+ if (unlikely(direction == SBUS_DMA_NONE))
+ BUG();
+
+ npages = prepare_sg(sglist, nelems);
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);
+ base = alloc_npages(iommu, npages);
+ spin_unlock_irqrestore(&iommu->lock, flags);
+
+ if (unlikely(base == NULL))
+ BUG();
+
+ dma_base = MAP_BASE +
+ ((base - iommu->page_table) << IO_PAGE_SHIFT);
/* Normalize DVMA addresses. */
- sgtmp = sg;
- used = nents;
+ used = nelems;
+ sgtmp = sglist;
while (used && sgtmp->dma_length) {
sgtmp->dma_address += dma_base;
sgtmp++;
used--;
}
- used = nents - used;
+ used = nelems - used;
- iopte_bits = IOPTE_VALID | IOPTE_STBUF | IOPTE_CACHE;
- if (dir != SBUS_DMA_TODEVICE)
- iopte_bits |= IOPTE_WRITE;
+ iopte_protection = IOPTE_VALID | IOPTE_STBUF | IOPTE_CACHE;
+ if (direction != SBUS_DMA_TODEVICE)
+ iopte_protection |= IOPTE_WRITE;
+
+ fill_sg(base, sglist, used, nelems, iopte_protection);
- fill_sg(iopte, sg, used, nents, iopte_bits);
#ifdef VERIFY_SG
- verify_sglist(sg, nents, iopte, npages);
+ verify_sglist(sglist, nelems, base, 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)
+void sbus_unmap_sg(struct sbus_dev *sdev, struct scatterlist *sglist, int nelems, int direction)
{
- unsigned long size, flags;
struct sbus_iommu *iommu;
- u32 dvma_base;
- int i;
+ iopte_t *base;
+ unsigned long flags, i, npages;
+ u32 bus_addr;
- /* Fast path single entry scatterlists. */
- if (nents == 1) {
- sbus_unmap_single(sdev, sg->dma_address, sg->dma_length, direction);
- return;
- }
+ if (unlikely(direction == SBUS_DMA_NONE))
+ BUG();
+
+ iommu = sdev->bus->iommu;
+
+ bus_addr = sglist->dma_address & IO_PAGE_MASK;
- dvma_base = sg[0].dma_address & IO_PAGE_MASK;
- for (i = 0; i < nents; i++) {
- if (sg[i].dma_length == 0)
+ for (i = 1; i < nelems; i++)
+ if (sglist[i].dma_length == 0)
break;
- }
i--;
- size = IO_PAGE_ALIGN(sg[i].dma_address + sg[i].dma_length) - dvma_base;
+ npages = (IO_PAGE_ALIGN(sglist[i].dma_address + sglist[i].dma_length) -
+ bus_addr) >> IO_PAGE_SHIFT;
+
+ base = iommu->page_table +
+ ((bus_addr - MAP_BASE) >> IO_PAGE_SHIFT);
- iommu = sdev->bus->iommu;
spin_lock_irqsave(&iommu->lock, flags);
- free_streaming_cluster(iommu, dvma_base, size >> IO_PAGE_SHIFT);
- sbus_strbuf_flush(iommu, dvma_base, size >> IO_PAGE_SHIFT, direction);
+ sbus_strbuf_flush(iommu, bus_addr, npages, direction);
+ for (i = 0; i < npages; i++)
+ iopte_val(base[i]) = 0UL;
+ free_npages(iommu, bus_addr - MAP_BASE, npages);
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)
+void sbus_dma_sync_single_for_cpu(struct sbus_dev *sdev, dma_addr_t bus_addr, size_t sz, int direction)
{
- struct sbus_iommu *iommu = sdev->bus->iommu;
- unsigned long flags;
+ struct sbus_iommu *iommu;
+ unsigned long flags, npages;
+
+ iommu = sdev->bus->iommu;
- size = (IO_PAGE_ALIGN(base + size) - (base & IO_PAGE_MASK));
+ npages = IO_PAGE_ALIGN(bus_addr + sz) - (bus_addr & IO_PAGE_MASK);
+ npages >>= IO_PAGE_SHIFT;
+ bus_addr &= IO_PAGE_MASK;
spin_lock_irqsave(&iommu->lock, flags);
- sbus_strbuf_flush(iommu, base & IO_PAGE_MASK, size >> IO_PAGE_SHIFT, direction);
+ sbus_strbuf_flush(iommu, bus_addr, npages, direction);
spin_unlock_irqrestore(&iommu->lock, flags);
}
{
}
-void sbus_dma_sync_sg_for_cpu(struct sbus_dev *sdev, struct scatterlist *sg, int nents, int direction)
+void sbus_dma_sync_sg_for_cpu(struct sbus_dev *sdev, struct scatterlist *sglist, int nelems, int direction)
{
- struct sbus_iommu *iommu = sdev->bus->iommu;
- unsigned long flags, size;
- u32 base;
- int i;
+ struct sbus_iommu *iommu;
+ unsigned long flags, npages, i;
+ u32 bus_addr;
+
+ iommu = sdev->bus->iommu;
- base = sg[0].dma_address & IO_PAGE_MASK;
- for (i = 0; i < nents; i++) {
- if (sg[i].dma_length == 0)
+ bus_addr = sglist[0].dma_address & IO_PAGE_MASK;
+ for (i = 0; i < nelems; i++) {
+ if (!sglist[i].dma_length)
break;
}
i--;
- size = IO_PAGE_ALIGN(sg[i].dma_address + sg[i].dma_length) - base;
+ npages = (IO_PAGE_ALIGN(sglist[i].dma_address + sglist[i].dma_length)
+ - bus_addr) >> IO_PAGE_SHIFT;
spin_lock_irqsave(&iommu->lock, flags);
- sbus_strbuf_flush(iommu, base, size >> IO_PAGE_SHIFT, direction);
+ sbus_strbuf_flush(iommu, bus_addr, npages, direction);
spin_unlock_irqrestore(&iommu->lock, flags);
}
struct linux_prom64_registers *pr;
struct device_node *dp;
struct sbus_iommu *iommu;
- unsigned long regs, tsb_base;
+ unsigned long regs;
u64 control;
int i;
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);
sbus->portid, regs);
/* Setup for TSB_SIZE=7, TBW_SIZE=0, MMU_DE=1, MMU_EN=1 */
+ sbus_iommu_table_init(iommu, IO_TSB_SIZE);
+
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
upa_readq(iommu->sbus_control_reg);
/* Give the TSB to SYSIO. */
- upa_writeq(__pa(tsb_base), iommu->iommu_regs + IOMMU_TSBBASE);
+ upa_writeq(__pa(iommu->page_table), iommu->iommu_regs + IOMMU_TSBBASE);
/* Setup streaming buffer, DE=1 SB_EN=1 */
control = (1UL << 1UL) | (1UL << 0UL);
git.openpandora.org / pandora-kernel.git / commitdiff