drivers/iommu/omap-iopgtable.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * omap iommu: pagetable definitions
   4  *
   5  * Copyright (C) 2008-2010 Nokia Corporation
   6  *
   7  * Written by Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
   8  */
   9
  10 #ifndef _OMAP_IOPGTABLE_H
  11 #define _OMAP_IOPGTABLE_H
  12
  13 #include <linux/bitops.h>
  14
  15 /*
  16  * "L2 table" address mask and size definitions.
  17  */
  18 #define IOPGD_SHIFT             20
  19 #define IOPGD_SIZE              BIT(IOPGD_SHIFT)
  20 #define IOPGD_MASK              (~(IOPGD_SIZE - 1))
  21
  22 /*
  23  * "section" address mask and size definitions.
  24  */
  25 #define IOSECTION_SHIFT         20
  26 #define IOSECTION_SIZE          BIT(IOSECTION_SHIFT)
  27 #define IOSECTION_MASK          (~(IOSECTION_SIZE - 1))
  28
  29 /*
  30  * "supersection" address mask and size definitions.
  31  */
  32 #define IOSUPER_SHIFT           24
  33 #define IOSUPER_SIZE            BIT(IOSUPER_SHIFT)
  34 #define IOSUPER_MASK            (~(IOSUPER_SIZE - 1))
  35
  36 #define PTRS_PER_IOPGD          (1UL << (32 - IOPGD_SHIFT))
  37 #define IOPGD_TABLE_SIZE        (PTRS_PER_IOPGD * sizeof(u32))
  38
  39 /*
  40  * "small page" address mask and size definitions.
  41  */
  42 #define IOPTE_SHIFT             12
  43 #define IOPTE_SIZE              BIT(IOPTE_SHIFT)
  44 #define IOPTE_MASK              (~(IOPTE_SIZE - 1))
  45
  46 /*
  47  * "large page" address mask and size definitions.
  48  */
  49 #define IOLARGE_SHIFT           16
  50 #define IOLARGE_SIZE            BIT(IOLARGE_SHIFT)
  51 #define IOLARGE_MASK            (~(IOLARGE_SIZE - 1))
  52
  53 #define PTRS_PER_IOPTE          (1UL << (IOPGD_SHIFT - IOPTE_SHIFT))
  54 #define IOPTE_TABLE_SIZE        (PTRS_PER_IOPTE * sizeof(u32))
  55
  56 #define IOPAGE_MASK             IOPTE_MASK
  57
  58 /**
  59  * omap_iommu_translate() - va to pa translation
  60  * @d:          omap iommu descriptor
  61  * @va:         virtual address
  62  * @mask:       omap iommu descriptor mask
  63  *
  64  * va to pa translation
  65  */
  66 static inline phys_addr_t omap_iommu_translate(unsigned long d, dma_addr_t va,
  67                                                dma_addr_t mask)
  68 {
  69         return (d & mask) | (va & (~mask));
  70 }
  71
  72 /*
  73  * some descriptor attributes.
  74  */
  75 #define IOPGD_TABLE             (1)
  76 #define IOPGD_SECTION           (2)
  77 #define IOPGD_SUPER             (BIT(18) | IOPGD_SECTION)
  78
  79 #define iopgd_is_table(x)       (((x) & 3) == IOPGD_TABLE)
  80 #define iopgd_is_section(x)     (((x) & (1 << 18 | 3)) == IOPGD_SECTION)
  81 #define iopgd_is_super(x)       (((x) & (1 << 18 | 3)) == IOPGD_SUPER)
  82
  83 #define IOPTE_SMALL             (2)
  84 #define IOPTE_LARGE             (1)
  85
  86 #define iopte_is_small(x)       (((x) & 2) == IOPTE_SMALL)
  87 #define iopte_is_large(x)       (((x) & 3) == IOPTE_LARGE)
  88
  89 /* to find an entry in a page-table-directory */
  90 #define iopgd_index(da)         (((da) >> IOPGD_SHIFT) & (PTRS_PER_IOPGD - 1))
  91 #define iopgd_offset(obj, da)   ((obj)->iopgd + iopgd_index(da))
  92
  93 #define iopgd_page_paddr(iopgd) (*iopgd & ~((1 << 10) - 1))
  94 #define iopgd_page_vaddr(iopgd) ((u32 *)phys_to_virt(iopgd_page_paddr(iopgd)))
  95
  96 /* to find an entry in the second-level page table. */
  97 #define iopte_index(da)         (((da) >> IOPTE_SHIFT) & (PTRS_PER_IOPTE - 1))
  98 #define iopte_offset(iopgd, da) (iopgd_page_vaddr(iopgd) + iopte_index(da))
  99
 100 #endif /* _OMAP_IOPGTABLE_H */