LXR linux/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 */
  66static 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 */
 101