release/src-rt-6.x.4708/linux/linux-2.6.36/arch/arm/plat-omap/include/plat/iovmm.h

   1 /*
   2  * omap iommu: simple virtual address space management
   3  *
   4  * Copyright (C) 2008-2009 Nokia Corporation
   5  *
   6  * Written by Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #ifndef __IOMMU_MMAP_H
  14 #define __IOMMU_MMAP_H
  15
  16 struct iovm_struct {
  17         struct iommu            *iommu; /* iommu object which this belongs to */
  18         u32                     da_start; /* area definition */
  19         u32                     da_end;
  20         u32                     flags; /* IOVMF_: see below */
  21         struct list_head        list; /* linked in ascending order */
  22         const struct sg_table   *sgt; /* keep 'page' <-> 'da' mapping */
  23         void                    *va; /* mpu side mapped address */
  24 };
  25
  26 /*
  27  * IOVMF_FLAGS: attribute for iommu virtual memory area(iovma)
  28  *
  29  * lower 16 bit is used for h/w and upper 16 bit is for s/w.
  30  */
  31 #define IOVMF_SW_SHIFT          16
  32 #define IOVMF_HW_SIZE           (1 << IOVMF_SW_SHIFT)
  33 #define IOVMF_HW_MASK           (IOVMF_HW_SIZE - 1)
  34 #define IOVMF_SW_MASK           (~IOVMF_HW_MASK)UL
  35
  36 /*
  37  * iovma: h/w flags derived from cam and ram attribute
  38  */
  39 #define IOVMF_CAM_MASK          (~((1 << 10) - 1))
  40 #define IOVMF_RAM_MASK          (~IOVMF_CAM_MASK)
  41
  42 #define IOVMF_PGSZ_MASK         (3 << 0)
  43 #define IOVMF_PGSZ_1M           MMU_CAM_PGSZ_1M
  44 #define IOVMF_PGSZ_64K          MMU_CAM_PGSZ_64K
  45 #define IOVMF_PGSZ_4K           MMU_CAM_PGSZ_4K
  46 #define IOVMF_PGSZ_16M          MMU_CAM_PGSZ_16M
  47
  48 #define IOVMF_ENDIAN_MASK       (1 << 9)
  49 #define IOVMF_ENDIAN_BIG        MMU_RAM_ENDIAN_BIG
  50 #define IOVMF_ENDIAN_LITTLE     MMU_RAM_ENDIAN_LITTLE
  51
  52 #define IOVMF_ELSZ_MASK         (3 << 7)
  53 #define IOVMF_ELSZ_8            MMU_RAM_ELSZ_8
  54 #define IOVMF_ELSZ_16           MMU_RAM_ELSZ_16
  55 #define IOVMF_ELSZ_32           MMU_RAM_ELSZ_32
  56 #define IOVMF_ELSZ_NONE         MMU_RAM_ELSZ_NONE
  57
  58 #define IOVMF_MIXED_MASK        (1 << 6)
  59 #define IOVMF_MIXED             MMU_RAM_MIXED
  60
  61 /*
  62  * iovma: s/w flags, used for mapping and umapping internally.
  63  */
  64 #define IOVMF_MMIO              (1 << IOVMF_SW_SHIFT)
  65 #define IOVMF_ALLOC             (2 << IOVMF_SW_SHIFT)
  66 #define IOVMF_ALLOC_MASK        (3 << IOVMF_SW_SHIFT)
  67
  68 /* "superpages" is supported just with physically linear pages */
  69 #define IOVMF_DISCONT           (1 << (2 + IOVMF_SW_SHIFT))
  70 #define IOVMF_LINEAR            (2 << (2 + IOVMF_SW_SHIFT))
  71 #define IOVMF_LINEAR_MASK       (3 << (2 + IOVMF_SW_SHIFT))
  72
  73 #define IOVMF_DA_FIXED          (1 << (4 + IOVMF_SW_SHIFT))
  74 #define IOVMF_DA_ANON           (2 << (4 + IOVMF_SW_SHIFT))
  75 #define IOVMF_DA_MASK           (3 << (4 + IOVMF_SW_SHIFT))
  76
  77
  78 extern struct iovm_struct *find_iovm_area(struct iommu *obj, u32 da);
  79 extern u32 iommu_vmap(struct iommu *obj, u32 da,
  80                         const struct sg_table *sgt, u32 flags);
  81 extern struct sg_table *iommu_vunmap(struct iommu *obj, u32 da);
  82 extern u32 iommu_vmalloc(struct iommu *obj, u32 da, size_t bytes,
  83                            u32 flags);
  84 extern void iommu_vfree(struct iommu *obj, const u32 da);
  85 extern u32 iommu_kmap(struct iommu *obj, u32 da, u32 pa, size_t bytes,
  86                         u32 flags);
  87 extern void iommu_kunmap(struct iommu *obj, u32 da);
  88 extern u32 iommu_kmalloc(struct iommu *obj, u32 da, size_t bytes,
  89                            u32 flags);
  90 extern void iommu_kfree(struct iommu *obj, u32 da);
  91
  92 extern void *da_to_va(struct iommu *obj, u32 da);
  93
  94 #endif /* __IOMMU_MMAP_H */