LXR linux/arch/sparc/kernel/iommu

   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
  37static 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#endif /* _IOMMU_COMMON_H */
  51