arch/sparc64/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
  16 #include <asm/iommu.h>
  17 #include <asm/scatterlist.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)             (((addr)+IO_PAGE_SIZE-1)&IO_PAGE_MASK)
  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 unsigned long iommu_num_pages(unsigned long vaddr,
  38                                             unsigned long slen)
  39 {
  40         unsigned long npages;
  41
  42         npages = IO_PAGE_ALIGN(vaddr + slen) - (vaddr & IO_PAGE_MASK);
  43         npages >>= IO_PAGE_SHIFT;
  44
  45         return npages;
  46 }
  47
  48 static inline unsigned long calc_npages(struct scatterlist *sglist, int nelems)
  49 {
  50         unsigned long i, npages = 0;
  51         struct scatterlist *sg;
  52
  53         for_each_sg(sglist, sg, nelems, i) {
  54                 unsigned long paddr = SG_ENT_PHYS_ADDRESS(sg);
  55                 npages += iommu_num_pages(paddr, sg->length);
  56         }
  57
  58         return npages;
  59 }
  60
  61 extern unsigned long iommu_range_alloc(struct device *dev,
  62                                        struct iommu *iommu,
  63                                        unsigned long npages,
  64                                        unsigned long *handle);
  65 extern void iommu_range_free(struct iommu *iommu,
  66                              dma_addr_t dma_addr,
  67                              unsigned long npages);
  68
  69 #endif /* _IOMMU_COMMON_H */