1 files changed, 136 insertions, 107 deletions

diff --git a/arch/sparc64/kernel/sbus.c b/arch/sparc64/kernel/sbus.c
index 14f78fb5e890..3b05428cc909 100644
--- a/arch/sparc64/kernel/sbus.c
+++ b/arch/sparc64/kernel/sbus.c
@@ -26,23 +26,9 @@
 
 #define MAP_BASE        ((u32)0xc0000000)
 
-struct sbus_iommu_arena {
-        unsigned long   *map;
-        unsigned int    hint;
-        unsigned int    limit;
-};
-
-struct sbus_iommu {
-        spinlock_t              lock;
-
-        struct sbus_iommu_arena arena;
-
-        iopte_t                 *page_table;
-        unsigned long           strbuf_regs;
-        unsigned long           iommu_regs;
-        unsigned long           sbus_control_reg;
-
-        volatile unsigned long  strbuf_flushflag;
+struct sbus_info {
+        struct iommu    iommu;
+        struct strbuf   strbuf;
 };
 
 /* Offsets from iommu_regs */
@@ -58,16 +44,17 @@ struct sbus_iommu {
 
 #define IOMMU_DRAM_VALID        (1UL << 30UL)
 
-static void __iommu_flushall(struct sbus_iommu *iommu)
+static void __iommu_flushall(struct iommu *iommu)
 {
-        unsigned long tag = iommu->iommu_regs + IOMMU_TAGDIAG;
+        unsigned long tag;
         int entry;
 
+        tag = iommu->iommu_control + (IOMMU_TAGDIAG - IOMMU_CONTROL);
         for (entry = 0; entry < 16; entry++) {
                 upa_writeq(0, tag);
                 tag += 8UL;
         }
-        upa_readq(iommu->sbus_control_reg);
+        upa_readq(iommu->write_complete_reg);
 }
 
 /* Offsets from strbuf_regs */
@@ -82,15 +69,14 @@ static void __iommu_flushall(struct sbus_iommu *iommu)
 
 #define STRBUF_TAG_VALID        0x02UL
 
-static void sbus_strbuf_flush(struct sbus_iommu *iommu, u32 base, unsigned long npages, int direction)
+static void sbus_strbuf_flush(struct iommu *iommu, struct strbuf *strbuf, u32 base, unsigned long npages, int direction)
 {
         unsigned long n;
         int limit;
 
         n = npages;
         while (n--)
-                upa_writeq(base + (n << IO_PAGE_SHIFT),
-                           iommu->strbuf_regs + STRBUF_PFLUSH);
+                upa_writeq(base + (n << IO_PAGE_SHIFT), strbuf->strbuf_pflush);
 
         /* If the device could not have possibly put dirty data into
          * the streaming cache, no flush-flag synchronization needs
@@ -99,15 +85,14 @@ static void sbus_strbuf_flush(struct sbus_iommu *iommu, u32 base, unsigned long
         if (direction == SBUS_DMA_TODEVICE)
                 return;
 
-        iommu->strbuf_flushflag = 0UL;
+        *(strbuf->strbuf_flushflag) = 0UL;
 
         /* Whoopee cushion! */
-        upa_writeq(__pa(&iommu->strbuf_flushflag),
-                   iommu->strbuf_regs + STRBUF_FSYNC);
-        upa_readq(iommu->sbus_control_reg);
+        upa_writeq(strbuf->strbuf_flushflag_pa, strbuf->strbuf_fsync);
+        upa_readq(iommu->write_complete_reg);
 
         limit = 100000;
-        while (iommu->strbuf_flushflag == 0UL) {
+        while (*(strbuf->strbuf_flushflag) == 0UL) {
                 limit--;
                 if (!limit)
                         break;
@@ -121,9 +106,9 @@ static void sbus_strbuf_flush(struct sbus_iommu *iommu, u32 base, unsigned long
 }
 
 /* Based largely upon the ppc64 iommu allocator.  */
-static long sbus_arena_alloc(struct sbus_iommu *iommu, unsigned long npages)
+static long sbus_arena_alloc(struct iommu *iommu, unsigned long npages)
 {
-        struct sbus_iommu_arena *arena = &iommu->arena;
+        struct iommu_arena *arena = &iommu->arena;
         unsigned long n, i, start, end, limit;
         int pass;
 
@@ -162,7 +147,7 @@ again:
         return n;
 }
 
-static void sbus_arena_free(struct sbus_iommu_arena *arena, unsigned long base, unsigned long npages)
+static void sbus_arena_free(struct iommu_arena *arena, unsigned long base, unsigned long npages)
 {
         unsigned long i;
 
@@ -170,7 +155,7 @@ static void sbus_arena_free(struct sbus_iommu_arena *arena, unsigned long base,
                 __clear_bit(i, arena->map);
 }
 
-static void sbus_iommu_table_init(struct sbus_iommu *iommu, unsigned int tsbsize)
+static void sbus_iommu_table_init(struct iommu *iommu, unsigned int tsbsize)
 {
         unsigned long tsbbase, order, sz, num_tsb_entries;
 
@@ -178,13 +163,14 @@ static void sbus_iommu_table_init(struct sbus_iommu *iommu, unsigned int tsbsize
 
         /* Setup initial software IOMMU state. */
         spin_lock_init(&iommu->lock);
+        iommu->page_table_map_base = MAP_BASE;
 
         /* 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_printf("SBUS_IOMMU: Error, kmalloc(arena.map) failed.\n");
                 prom_halt();
         }
         iommu->arena.limit = num_tsb_entries;
@@ -200,7 +186,7 @@ static void sbus_iommu_table_init(struct sbus_iommu *iommu, unsigned int tsbsize
         memset(iommu->page_table, 0, tsbsize);
 }
 
-static inline iopte_t *alloc_npages(struct sbus_iommu *iommu, unsigned long npages)
+static inline iopte_t *alloc_npages(struct iommu *iommu, unsigned long npages)
 {
         long entry;
 
@@ -211,14 +197,15 @@ static inline iopte_t *alloc_npages(struct sbus_iommu *iommu, unsigned long npag
         return iommu->page_table + entry;
 }
 
-static inline void free_npages(struct sbus_iommu *iommu, dma_addr_t base, unsigned long npages)
+static inline void free_npages(struct 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)
 {
-        struct sbus_iommu *iommu;
+        struct sbus_info *info;
+        struct iommu *iommu;
         iopte_t *iopte;
         unsigned long flags, order, first_page;
         void *ret;
@@ -234,7 +221,8 @@ void *sbus_alloc_consistent(struct sbus_dev *sdev, size_t size, dma_addr_t *dvma
                 return NULL;
         memset((char *)first_page, 0, PAGE_SIZE << order);
 
-        iommu = sdev->bus->iommu;
+        info = sdev->bus->iommu;
+        iommu = &info->iommu;
 
         spin_lock_irqsave(&iommu->lock, flags);
         iopte = alloc_npages(iommu, size >> IO_PAGE_SHIFT);
@@ -245,7 +233,7 @@ void *sbus_alloc_consistent(struct sbus_dev *sdev, size_t size, dma_addr_t *dvma
                 return NULL;
         }
 
-        *dvma_addr = (MAP_BASE +
+        *dvma_addr = (iommu->page_table_map_base +
                       ((iopte - iommu->page_table) << IO_PAGE_SHIFT));
         ret = (void *) first_page;
         npages = size >> IO_PAGE_SHIFT;
@@ -263,18 +251,20 @@ void *sbus_alloc_consistent(struct sbus_dev *sdev, size_t size, dma_addr_t *dvma
 
 void sbus_free_consistent(struct sbus_dev *sdev, size_t size, void *cpu, dma_addr_t dvma)
 {
-        struct sbus_iommu *iommu;
+        struct sbus_info *info;
+        struct iommu *iommu;
         iopte_t *iopte;
         unsigned long flags, order, npages;
 
         npages = IO_PAGE_ALIGN(size) >> IO_PAGE_SHIFT;
-        iommu = sdev->bus->iommu;
+        info = sdev->bus->iommu;
+        iommu = &info->iommu;
         iopte = iommu->page_table +
-                ((dvma - MAP_BASE) >> IO_PAGE_SHIFT);
+                ((dvma - iommu->page_table_map_base) >> IO_PAGE_SHIFT);
 
         spin_lock_irqsave(&iommu->lock, flags);
 
-        free_npages(iommu, dvma - MAP_BASE, npages);
+        free_npages(iommu, dvma - iommu->page_table_map_base, npages);
 
         spin_unlock_irqrestore(&iommu->lock, flags);
 
@@ -285,14 +275,16 @@ void sbus_free_consistent(struct sbus_dev *sdev, size_t size, void *cpu, dma_add
 
 dma_addr_t sbus_map_single(struct sbus_dev *sdev, void *ptr, size_t sz, int direction)
 {
-        struct sbus_iommu *iommu;
+        struct sbus_info *info;
+        struct 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;
+        info = sdev->bus->iommu;
+        iommu = &info->iommu;
 
         if (unlikely(direction == SBUS_DMA_NONE))
                 BUG();
@@ -308,7 +300,7 @@ dma_addr_t sbus_map_single(struct sbus_dev *sdev, void *ptr, size_t sz, int dire
         if (unlikely(!base))
                 BUG();
 
-        bus_addr = (MAP_BASE +
+        bus_addr = (iommu->page_table_map_base +
                     ((base - iommu->page_table) << IO_PAGE_SHIFT));
         ret = bus_addr | (oaddr & ~IO_PAGE_MASK);
         base_paddr = __pa(oaddr & IO_PAGE_MASK);
@@ -325,7 +317,9 @@ dma_addr_t sbus_map_single(struct sbus_dev *sdev, void *ptr, size_t sz, int dire
 
 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;
+        struct sbus_info *info = sdev->bus->iommu;
+        struct iommu *iommu = &info->iommu;
+        struct strbuf *strbuf = &info->strbuf;
         iopte_t *base;
         unsigned long flags, npages, i;
 
@@ -335,15 +329,15 @@ void sbus_unmap_single(struct sbus_dev *sdev, dma_addr_t bus_addr, size_t sz, in
         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);
+                ((bus_addr - iommu->page_table_map_base) >> IO_PAGE_SHIFT);
 
         bus_addr &= IO_PAGE_MASK;
 
         spin_lock_irqsave(&iommu->lock, flags);
-        sbus_strbuf_flush(iommu, bus_addr, npages, direction);
+        sbus_strbuf_flush(iommu, strbuf, bus_addr, npages, direction);
         for (i = 0; i < npages; i++)
                 iopte_val(base[i]) = 0UL;
-        free_npages(iommu, bus_addr - MAP_BASE, npages);
+        free_npages(iommu, bus_addr - iommu->page_table_map_base, npages);
         spin_unlock_irqrestore(&iommu->lock, flags);
 }
 
@@ -425,7 +419,8 @@ static inline void fill_sg(iopte_t *iopte, struct scatterlist *sg,
 
 int sbus_map_sg(struct sbus_dev *sdev, struct scatterlist *sglist, int nelems, int direction)
 {
-        struct sbus_iommu *iommu;
+        struct sbus_info *info;
+        struct iommu *iommu;
         unsigned long flags, npages, iopte_protection;
         iopte_t *base;
         u32 dma_base;
@@ -442,7 +437,8 @@ int sbus_map_sg(struct sbus_dev *sdev, struct scatterlist *sglist, int nelems, i
                 return 1;
         }
 
-        iommu = sdev->bus->iommu;
+        info = sdev->bus->iommu;
+        iommu = &info->iommu;
 
         if (unlikely(direction == SBUS_DMA_NONE))
                 BUG();
@@ -456,7 +452,7 @@ int sbus_map_sg(struct sbus_dev *sdev, struct scatterlist *sglist, int nelems, i
         if (unlikely(base == NULL))
                 BUG();
 
-        dma_base = MAP_BASE +
+        dma_base = iommu->page_table_map_base +
                 ((base - iommu->page_table) << IO_PAGE_SHIFT);
 
         /* Normalize DVMA addresses. */
@@ -485,7 +481,9 @@ int sbus_map_sg(struct sbus_dev *sdev, struct scatterlist *sglist, int nelems, i
 
 void sbus_unmap_sg(struct sbus_dev *sdev, struct scatterlist *sglist, int nelems, int direction)
 {
-        struct sbus_iommu *iommu;
+        struct sbus_info *info;
+        struct iommu *iommu;
+        struct strbuf *strbuf;
         iopte_t *base;
         unsigned long flags, i, npages;
         u32 bus_addr;
@@ -493,7 +491,9 @@ void sbus_unmap_sg(struct sbus_dev *sdev, struct scatterlist *sglist, int nelems
         if (unlikely(direction == SBUS_DMA_NONE))
                 BUG();
 
-        iommu = sdev->bus->iommu;
+        info = sdev->bus->iommu;
+        iommu = &info->iommu;
+        strbuf = &info->strbuf;
 
         bus_addr = sglist->dma_address & IO_PAGE_MASK;
 
@@ -505,29 +505,33 @@ void sbus_unmap_sg(struct sbus_dev *sdev, struct scatterlist *sglist, int nelems
                   bus_addr) >> IO_PAGE_SHIFT;
 
         base = iommu->page_table +
-                ((bus_addr - MAP_BASE) >> IO_PAGE_SHIFT);
+                ((bus_addr - iommu->page_table_map_base) >> IO_PAGE_SHIFT);
 
         spin_lock_irqsave(&iommu->lock, flags);
-        sbus_strbuf_flush(iommu, bus_addr, npages, direction);
+        sbus_strbuf_flush(iommu, strbuf, bus_addr, npages, direction);
         for (i = 0; i < npages; i++)
                 iopte_val(base[i]) = 0UL;
-        free_npages(iommu, bus_addr - MAP_BASE, npages);
+        free_npages(iommu, bus_addr - iommu->page_table_map_base, npages);
         spin_unlock_irqrestore(&iommu->lock, flags);
 }
 
 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;
+        struct sbus_info *info;
+        struct iommu *iommu;
+        struct strbuf *strbuf;
         unsigned long flags, npages;
 
-        iommu = sdev->bus->iommu;
+        info = sdev->bus->iommu;
+        iommu = &info->iommu;
+        strbuf = &info->strbuf;
 
         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, bus_addr, npages, direction);
+        sbus_strbuf_flush(iommu, strbuf, bus_addr, npages, direction);
         spin_unlock_irqrestore(&iommu->lock, flags);
 }
 
@@ -537,11 +541,15 @@ void sbus_dma_sync_single_for_device(struct sbus_dev *sdev, dma_addr_t base, siz
 
 void sbus_dma_sync_sg_for_cpu(struct sbus_dev *sdev, struct scatterlist *sglist, int nelems, int direction)
 {
-        struct sbus_iommu *iommu;
+        struct sbus_info *info;
+        struct iommu *iommu;
+        struct strbuf *strbuf;
         unsigned long flags, npages, i;
         u32 bus_addr;
 
-        iommu = sdev->bus->iommu;
+        info = sdev->bus->iommu;
+        iommu = &info->iommu;
+        strbuf = &info->strbuf;
 
         bus_addr = sglist[0].dma_address & IO_PAGE_MASK;
         for (i = 0; i < nelems; i++) {
@@ -553,7 +561,7 @@ void sbus_dma_sync_sg_for_cpu(struct sbus_dev *sdev, struct scatterlist *sglist,
                   - bus_addr) >> IO_PAGE_SHIFT;
 
         spin_lock_irqsave(&iommu->lock, flags);
-        sbus_strbuf_flush(iommu, bus_addr, npages, direction);
+        sbus_strbuf_flush(iommu, strbuf, bus_addr, npages, direction);
         spin_unlock_irqrestore(&iommu->lock, flags);
 }
 
@@ -564,12 +572,13 @@ void sbus_dma_sync_sg_for_device(struct sbus_dev *sdev, struct scatterlist *sg,
 /* 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;
+        struct sbus_info *info = sdev->bus->iommu;
+        struct iommu *iommu = &info->iommu;
         int slot = sdev->slot;
         unsigned long cfg_reg;
         u64 val;
 
-        cfg_reg = iommu->sbus_control_reg;
+        cfg_reg = iommu->write_complete_reg;
         switch (slot) {
         case 0:
                 cfg_reg += 0x20UL;
@@ -704,8 +713,9 @@ static unsigned long sysio_imap_to_iclr(unsigned long imap)
 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;
+        struct sbus_info *info = sbus->iommu;
+        struct iommu *iommu = &info->iommu;
+        unsigned long reg_base = iommu->write_complete_reg - 0x2000UL;
         unsigned long imap, iclr;
         int sbus_level = 0;
 
@@ -766,8 +776,9 @@ unsigned int sbus_build_irq(void *buscookie, unsigned int ino)
 static irqreturn_t sysio_ue_handler(int irq, void *dev_id)
 {
         struct sbus_bus *sbus = dev_id;
-        struct sbus_iommu *iommu = sbus->iommu;
-        unsigned long reg_base = iommu->sbus_control_reg - 0x2000UL;
+        struct sbus_info *info = sbus->iommu;
+        struct iommu *iommu = &info->iommu;
+        unsigned long reg_base = iommu->write_complete_reg - 0x2000UL;
         unsigned long afsr_reg, afar_reg;
         unsigned long afsr, afar, error_bits;
         int reported;
@@ -838,8 +849,9 @@ static irqreturn_t sysio_ue_handler(int irq, void *dev_id)
 static irqreturn_t sysio_ce_handler(int irq, void *dev_id)
 {
         struct sbus_bus *sbus = dev_id;
-        struct sbus_iommu *iommu = sbus->iommu;
-        unsigned long reg_base = iommu->sbus_control_reg - 0x2000UL;
+        struct sbus_info *info = sbus->iommu;
+        struct iommu *iommu = &info->iommu;
+        unsigned long reg_base = iommu->write_complete_reg - 0x2000UL;
         unsigned long afsr_reg, afar_reg;
         unsigned long afsr, afar, error_bits;
         int reported;
@@ -915,12 +927,13 @@ static irqreturn_t sysio_ce_handler(int irq, void *dev_id)
 static irqreturn_t sysio_sbus_error_handler(int irq, void *dev_id)
 {
         struct sbus_bus *sbus = dev_id;
-        struct sbus_iommu *iommu = sbus->iommu;
+        struct sbus_info *info = sbus->iommu;
+        struct iommu *iommu = &info->iommu;
         unsigned long afsr_reg, afar_reg, reg_base;
         unsigned long afsr, afar, error_bits;
         int reported;
 
-        reg_base = iommu->sbus_control_reg - 0x2000UL;
+        reg_base = iommu->write_complete_reg - 0x2000UL;
         afsr_reg = reg_base + SYSIO_SBUS_AFSR;
         afar_reg = reg_base + SYSIO_SBUS_AFAR;
 
@@ -982,8 +995,9 @@ static irqreturn_t sysio_sbus_error_handler(int irq, void *dev_id)
 
 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;
+        struct sbus_info *info = sbus->iommu;
+        struct iommu *iommu = &info->iommu;
+        unsigned long reg_base = iommu->write_complete_reg - 0x2000UL;
         unsigned int irq;
         u64 control;
 
@@ -1017,18 +1031,20 @@ static void __init sysio_register_error_handlers(struct sbus_bus *sbus)
                     SYSIO_ECNTRL_CEEN),
                    reg_base + ECC_CONTROL);
 
-        control = upa_readq(iommu->sbus_control_reg);
+        control = upa_readq(iommu->write_complete_reg);
         control |= 0x100UL; /* SBUS Error Interrupt Enable */
-        upa_writeq(control, iommu->sbus_control_reg);
+        upa_writeq(control, iommu->write_complete_reg);
 }
 
 /* Boot time initialization. */
 static void __init sbus_iommu_init(int __node, struct sbus_bus *sbus)
 {
-        struct linux_prom64_registers *pr;
+        const struct linux_prom64_registers *pr;
         struct device_node *dp;
-        struct sbus_iommu *iommu;
-        unsigned long regs;
+        struct sbus_info *info;
+        struct iommu *iommu;
+        struct strbuf *strbuf;
+        unsigned long regs, reg_base;
         u64 control;
         int i;
 
@@ -1043,33 +1059,42 @@ static void __init sbus_iommu_init(int __node, struct sbus_bus *sbus)
         }
         regs = pr->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");
+        info = kzalloc(sizeof(*info), GFP_ATOMIC);
+        if (info == NULL) {
+                prom_printf("sbus_iommu_init: Fatal error, "
+                            "kmalloc(info) failed\n");
                 prom_halt();
         }
 
-        /* Align on E$ line boundary. */
-        iommu = (struct sbus_iommu *)
-                (((unsigned long)iommu + (SMP_CACHE_BYTES - 1UL)) &
-                 ~(SMP_CACHE_BYTES - 1UL));
+        iommu = &info->iommu;
+        strbuf = &info->strbuf;
 
-        memset(iommu, 0, sizeof(*iommu));
+        reg_base = regs + SYSIO_IOMMUREG_BASE;
+        iommu->iommu_control = reg_base + IOMMU_CONTROL;
+        iommu->iommu_tsbbase = reg_base + IOMMU_TSBBASE;
+        iommu->iommu_flush = reg_base + IOMMU_FLUSH;
 
-        /* Setup spinlock. */
-        spin_lock_init(&iommu->lock);
+        reg_base = regs + SYSIO_STRBUFREG_BASE;
+        strbuf->strbuf_control = reg_base + STRBUF_CONTROL;
+        strbuf->strbuf_pflush = reg_base + STRBUF_PFLUSH;
+        strbuf->strbuf_fsync = reg_base + STRBUF_FSYNC;
 
-        /* Init register offsets. */
-        iommu->iommu_regs = regs + SYSIO_IOMMUREG_BASE;
-        iommu->strbuf_regs = regs + SYSIO_STRBUFREG_BASE;
+        strbuf->strbuf_enabled = 1;
+
+        strbuf->strbuf_flushflag = (volatile unsigned long *)
+                ((((unsigned long)&strbuf->__flushflag_buf[0])
+                  + 63UL)
+                 & ~63UL);
+        strbuf->strbuf_flushflag_pa = (unsigned long)
+                __pa(strbuf->strbuf_flushflag);
 
         /* The SYSIO SBUS control register is used for dummy reads
          * in order to ensure write completion.
          */
-        iommu->sbus_control_reg = regs + 0x2000UL;
+        iommu->write_complete_reg = regs + 0x2000UL;
 
         /* Link into SYSIO software state. */
-        sbus->iommu = iommu;
+        sbus->iommu = info;
 
         printk("SYSIO: UPA portID %x, at %016lx\n",
                sbus->portid, regs);
@@ -1077,40 +1102,44 @@ static void __init sbus_iommu_init(int __node, struct sbus_bus *sbus)
         /* 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 = upa_readq(iommu->iommu_control);
         control = ((7UL << 16UL)        |
                    (0UL << 2UL)         |
                    (1UL << 1UL)         |
                    (1UL << 0UL));
-        upa_writeq(control, iommu->iommu_regs + IOMMU_CONTROL);
+        upa_writeq(control, iommu->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;
+                unsigned long dram, tag;
+
+                dram = iommu->iommu_control + (IOMMU_DRAMDIAG - IOMMU_CONTROL);
+                tag = iommu->iommu_control + (IOMMU_TAGDIAG - IOMMU_CONTROL);
 
                 dram += (unsigned long)i * 8UL;
                 tag += (unsigned long)i * 8UL;
                 upa_writeq(0, dram);
                 upa_writeq(0, tag);
         }
-        upa_readq(iommu->sbus_control_reg);
+        upa_readq(iommu->write_complete_reg);
 
         /* Give the TSB to SYSIO. */
-        upa_writeq(__pa(iommu->page_table), iommu->iommu_regs + IOMMU_TSBBASE);
+        upa_writeq(__pa(iommu->page_table), iommu->iommu_tsbbase);
 
         /* Setup streaming buffer, DE=1 SB_EN=1 */
         control = (1UL << 1UL) | (1UL << 0UL);
-        upa_writeq(control, iommu->strbuf_regs + STRBUF_CONTROL);
+        upa_writeq(control, strbuf->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 = strbuf->strbuf_control +
+                        (STRBUF_PTAGDIAG - STRBUF_CONTROL);
+                ltag = strbuf->strbuf_control +
+                        (STRBUF_LTAGDIAG - STRBUF_CONTROL);
                 ptag += (unsigned long)i * 8UL;
                 ltag += (unsigned long)i * 8UL;
 
@@ -1119,9 +1148,9 @@ static void __init sbus_iommu_init(int __node, struct sbus_bus *sbus)
         }
 
         /* Enable DVMA arbitration for all devices/slots. */
-        control = upa_readq(iommu->sbus_control_reg);
+        control = upa_readq(iommu->write_complete_reg);
         control |= 0x3fUL;
-        upa_writeq(control, iommu->sbus_control_reg);
+        upa_writeq(control, iommu->write_complete_reg);
 
         /* Now some Xfire specific grot... */
         if (this_is_starfire)
@@ -1133,7 +1162,7 @@ static void __init sbus_iommu_init(int __node, struct sbus_bus *sbus)
 void sbus_fill_device_irq(struct sbus_dev *sdev)
 {
         struct device_node *dp = of_find_node_by_phandle(sdev->prom_node);
-        struct linux_prom_irqs *irqs;
+        const struct linux_prom_irqs *irqs;
 
         irqs = of_get_property(dp, "interrupts", NULL);
         if (!irqs) {