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 #include <linux/iommu.h>
  17
  18 struct iovm_struct {
  19         struct omap_iommu       *iommu; /* iommu object which this belongs to */
  20         u32                     da_start; /* area definition */
  21         u32                     da_end;
  22         u32                     flags; /* IOVMF_: see below */
  23         struct list_head        list; /* linked in ascending order */
  24         const struct sg_table   *sgt; /* keep 'page' <-> 'da' mapping */
  25         void                    *va; /* mpu side mapped address */
  26 };
  27
  28 /*
  29  * IOVMF_FLAGS: attribute for iommu virtual memory area(iovma)
  30  *
  31  * lower 16 bit is used for h/w and upper 16 bit is for s/w.
  32  */
  33 #define IOVMF_SW_SHIFT          16
  34
  35 /*
  36  * iovma: h/w flags derived from cam and ram attribute
  37  */
  38 #define IOVMF_CAM_MASK          (~((1 << 10) - 1))
  39 #define IOVMF_RAM_MASK          (~IOVMF_CAM_MASK)
  40
  41 #define IOVMF_PGSZ_MASK         (3 << 0)
  42 #define IOVMF_PGSZ_1M           MMU_CAM_PGSZ_1M
  43 #define IOVMF_PGSZ_64K          MMU_CAM_PGSZ_64K
  44 #define IOVMF_PGSZ_4K           MMU_CAM_PGSZ_4K
  45 #define IOVMF_PGSZ_16M          MMU_CAM_PGSZ_16M
  46
  47 #define IOVMF_ENDIAN_MASK       (1 << 9)
  48 #define IOVMF_ENDIAN_BIG        MMU_RAM_ENDIAN_BIG
  49 #define IOVMF_ENDIAN_LITTLE     MMU_RAM_ENDIAN_LITTLE
  50
  51 #define IOVMF_ELSZ_MASK         (3 << 7)
  52 #define IOVMF_ELSZ_8            MMU_RAM_ELSZ_8
  53 #define IOVMF_ELSZ_16           MMU_RAM_ELSZ_16
  54 #define IOVMF_ELSZ_32           MMU_RAM_ELSZ_32
  55 #define IOVMF_ELSZ_NONE         MMU_RAM_ELSZ_NONE
  56
  57 #define IOVMF_MIXED_MASK        (1 << 6)
  58 #define IOVMF_MIXED             MMU_RAM_MIXED
  59
  60 /*
  61  * iovma: s/w flags, used for mapping and umapping internally.
  62  */
  63 #define IOVMF_MMIO              (1 << IOVMF_SW_SHIFT)
  64 #define IOVMF_ALLOC             (2 << IOVMF_SW_SHIFT)
  65 #define IOVMF_ALLOC_MASK        (3 << IOVMF_SW_SHIFT)
  66
  67 /* "superpages" is supported just with physically linear pages */
  68 #define IOVMF_DISCONT           (1 << (2 + IOVMF_SW_SHIFT))
  69 #define IOVMF_LINEAR            (2 << (2 + IOVMF_SW_SHIFT))
  70 #define IOVMF_LINEAR_MASK       (3 << (2 + IOVMF_SW_SHIFT))
  71
  72 #define IOVMF_DA_FIXED          (1 << (4 + IOVMF_SW_SHIFT))
  73
  74
  75 extern struct iovm_struct *omap_find_iovm_area(struct device *dev, u32 da);
  76 extern u32
  77 omap_iommu_vmap(struct iommu_domain *domain, struct device *dev, u32 da,
  78                         const struct sg_table *sgt, u32 flags);
  79 extern struct sg_table *omap_iommu_vunmap(struct iommu_domain *domain,
  80                                 struct device *dev, u32 da);
  81 extern u32
  82 omap_iommu_vmalloc(struct iommu_domain *domain, struct device *dev,
  83                                 u32 da, size_t bytes, u32 flags);
  84 extern void
  85 omap_iommu_vfree(struct iommu_domain *domain, struct device *dev,
  86                                 const u32 da);
  87 extern void *omap_da_to_va(struct device *dev, u32 da);
  88
  89 #endif /* __IOMMU_MMAP_H */