arch/sparc/kernel/iommu_common.h

   1 /* iommu_common.h: UltraSparc SBUS/PCI common iommu declarations.
   2  *
   3  * Copyright (C) 1999, 2008 David S. Miller (davem@davemloft.net)
   4  */
   5
   6 #ifndef _IOMMU_COMMON_H
   7 #define _IOMMU_COMMON_H
   8
   9 #include <linux/kernel.h>
  10 #include <linux/types.h>
  11 #include <linux/sched.h>
  12 #include <linux/mm.h>
  13 #include <linux/scatterlist.h>
  14 #include <linux/device.h>
  15 #include <linux/iommu-helper.h>
  16
  17 #include <asm/iommu.h>
  18
  19 /*
  20  * These give mapping size of each iommu pte/tlb.
  21  */
  22 #define IO_PAGE_SHIFT                   13
  23 #define IO_PAGE_SIZE                    (1UL << IO_PAGE_SHIFT)
  24 #define IO_PAGE_MASK                    (~(IO_PAGE_SIZE-1))
  25 #define IO_PAGE_ALIGN(addr)             ALIGN(addr, IO_PAGE_SIZE)
  26
  27 #define IO_TSB_ENTRIES                  (128*1024)
  28 #define IO_TSB_SIZE                     (IO_TSB_ENTRIES * 8)
  29
  30 /*
  31  * This is the hardwired shift in the iotlb tag/data parts.
  32  */
  33 #define IOMMU_PAGE_SHIFT                13
  34
  35 #define SG_ENT_PHYS_ADDRESS(SG) (__pa(sg_virt((SG))))
  36
  37 static inline int is_span_boundary(unsigned long entry,
  38                                    unsigned long shift,
  39                                    unsigned long boundary_size,
  40                                    struct scatterlist *outs,
  41                                    struct scatterlist *sg)
  42 {
  43         unsigned long paddr = SG_ENT_PHYS_ADDRESS(outs);
  44         int nr = iommu_num_pages(paddr, outs->dma_length + sg->length,
  45                                  IO_PAGE_SIZE);
  46
  47         return iommu_is_span_boundary(entry, nr, shift, boundary_size);
  48 }
  49
  50 #define SPARC_MAPPING_ERROR     (~(dma_addr_t)0x0)
  51
  52 #endif /* _IOMMU_COMMON_H */