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omap-iopgtable.h
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omap-iopgtable.h
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/*
* omap iommu: pagetable definitions
*
* Copyright (C) 2008-2010 Nokia Corporation
*
* Written by Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef _OMAP_IOPGTABLE_H
#define _OMAP_IOPGTABLE_H
#include <linux/bitops.h>
/*
* "L2 table" address mask and size definitions.
*/
#define IOPGD_SHIFT 20
#define IOPGD_SIZE BIT(IOPGD_SHIFT)
#define IOPGD_MASK (~(IOPGD_SIZE - 1))
/*
* "section" address mask and size definitions.
*/
#define IOSECTION_SHIFT 20
#define IOSECTION_SIZE BIT(IOSECTION_SHIFT)
#define IOSECTION_MASK (~(IOSECTION_SIZE - 1))
/*
* "supersection" address mask and size definitions.
*/
#define IOSUPER_SHIFT 24
#define IOSUPER_SIZE BIT(IOSUPER_SHIFT)
#define IOSUPER_MASK (~(IOSUPER_SIZE - 1))
#define PTRS_PER_IOPGD (1UL << (32 - IOPGD_SHIFT))
#define IOPGD_TABLE_SIZE (PTRS_PER_IOPGD * sizeof(u32))
/*
* "small page" address mask and size definitions.
*/
#define IOPTE_SHIFT 12
#define IOPTE_SIZE BIT(IOPTE_SHIFT)
#define IOPTE_MASK (~(IOPTE_SIZE - 1))
/*
* "large page" address mask and size definitions.
*/
#define IOLARGE_SHIFT 16
#define IOLARGE_SIZE BIT(IOLARGE_SHIFT)
#define IOLARGE_MASK (~(IOLARGE_SIZE - 1))
#define PTRS_PER_IOPTE (1UL << (IOPGD_SHIFT - IOPTE_SHIFT))
#define IOPTE_TABLE_SIZE (PTRS_PER_IOPTE * sizeof(u32))
#define IOPAGE_MASK IOPTE_MASK
/**
* omap_iommu_translate() - va to pa translation
* @d: omap iommu descriptor
* @va: virtual address
* @mask: omap iommu descriptor mask
*
* va to pa translation
*/
static inline phys_addr_t omap_iommu_translate(u32 d, u32 va, u32 mask)
{
return (d & mask) | (va & (~mask));
}
/*
* some descriptor attributes.
*/
#define IOPGD_TABLE (1)
#define IOPGD_SECTION (2)
#define IOPGD_SUPER (BIT(18) | IOPGD_SECTION)
#define iopgd_is_table(x) (((x) & 3) == IOPGD_TABLE)
#define iopgd_is_section(x) (((x) & (1 << 18 | 3)) == IOPGD_SECTION)
#define iopgd_is_super(x) (((x) & (1 << 18 | 3)) == IOPGD_SUPER)
#define IOPTE_SMALL (2)
#define IOPTE_LARGE (1)
#define iopte_is_small(x) (((x) & 2) == IOPTE_SMALL)
#define iopte_is_large(x) (((x) & 3) == IOPTE_LARGE)
/* to find an entry in a page-table-directory */
#define iopgd_index(da) (((da) >> IOPGD_SHIFT) & (PTRS_PER_IOPGD - 1))
#define iopgd_offset(obj, da) ((obj)->iopgd + iopgd_index(da))
#define iopgd_page_paddr(iopgd) (*iopgd & ~((1 << 10) - 1))
#define iopgd_page_vaddr(iopgd) ((u32 *)phys_to_virt(iopgd_page_paddr(iopgd)))
/* to find an entry in the second-level page table. */
#define iopte_index(da) (((da) >> IOPTE_SHIFT) & (PTRS_PER_IOPTE - 1))
#define iopte_offset(iopgd, da) (iopgd_page_vaddr(iopgd) + iopte_index(da))
#endif /* _OMAP_IOPGTABLE_H */