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#include <asm/scatterlist.h>
  19
  20/*
  21 * These give mapping size of each iommu pte/tlb.
  22 */
  23#define IO_PAGE_SHIFT                   13
  24#define IO_PAGE_SIZE                    (1UL << IO_PAGE_SHIFT)
  25#define IO_PAGE_MASK                    (~(IO_PAGE_SIZE-1))
  26#define IO_PAGE_ALIGN(addr)             ALIGN(addr, IO_PAGE_SIZE)
  27
  28#define IO_TSB_ENTRIES                  (128*1024)
  29#define IO_TSB_SIZE                     (IO_TSB_ENTRIES * 8)
  30
  31/*
  32 * This is the hardwired shift in the iotlb tag/data parts.
  33 */
  34#define IOMMU_PAGE_SHIFT                13
  35
  36#define SG_ENT_PHYS_ADDRESS(SG) (__pa(sg_virt((SG))))
  37
  38static inline int is_span_boundary(unsigned long entry,
  39                                   unsigned long shift,
  40                                   unsigned long boundary_size,
  41                                   struct scatterlist *outs,
  42                                   struct scatterlist *sg)
  43{
  44        unsigned long paddr = SG_ENT_PHYS_ADDRESS(outs);
  45        int nr = iommu_num_pages(paddr, outs->dma_length + sg->length,
  46                                 IO_PAGE_SIZE);
  47
  48        return iommu_is_span_boundary(entry, nr, shift, boundary_size);
  49}
  50
  51extern unsigned long iommu_range_alloc(struct device *dev,
  52                                       struct iommu *iommu,
  53                                       unsigned long npages,
  54                                       unsigned long *handle);
  55extern void iommu_range_free(struct iommu *iommu,
  56                             dma_addr_t dma_addr,
  57                             unsigned long npages);
  58
  59#endif /* _IOMMU_COMMON_H */
  60