LXR linux/arch/arm/plat-omap/include/mach/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
  16struct 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
  78extern struct iovm_struct *find_iovm_area(struct iommu *obj, u32 da);
  79extern u32 iommu_vmap(struct iommu *obj, u32 da,
  80                        const struct sg_table *sgt, u32 flags);
  81extern struct sg_table *iommu_vunmap(struct iommu *obj, u32 da);
  82extern u32 iommu_vmalloc(struct iommu *obj, u32 da, size_t bytes,
  83                           u32 flags);
  84extern void iommu_vfree(struct iommu *obj, const u32 da);
  85extern u32 iommu_kmap(struct iommu *obj, u32 da, u32 pa, size_t bytes,
  86                        u32 flags);
  87extern void iommu_kunmap(struct iommu *obj, u32 da);
  88extern u32 iommu_kmalloc(struct iommu *obj, u32 da, size_t bytes,
  89                           u32 flags);
  90extern void iommu_kfree(struct iommu *obj, u32 da);
  91
  92extern void *da_to_va(struct iommu *obj, u32 da);
  93
  94#endif /* __IOMMU_MMAP_H */
  95