text: /*
   * 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 __PLAT_OMAP_IOMMU_H
  #define __PLAT_OMAP_IOMMU_H
  
  /*
   * "L2 table" address mask and size definitions.
   */
  #define IOPGD_SHIFT		20
  #define IOPGD_SIZE		(1UL << IOPGD_SHIFT)
  #define IOPGD_MASK		(~(IOPGD_SIZE - 1))
  
  /*
   * "section" address mask and size definitions.
   */
  #define IOSECTION_SHIFT		20
  #define IOSECTION_SIZE		(1UL << IOSECTION_SHIFT)
  #define IOSECTION_MASK		(~(IOSECTION_SIZE - 1))
  
  /*
   * "supersection" address mask and size definitions.
   */
  #define IOSUPER_SHIFT		24
  #define IOSUPER_SIZE		(1UL << 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		(1UL << IOPTE_SHIFT)
  #define IOPTE_MASK		(~(IOPTE_SIZE - 1))
  
  /*
   * "large page" address mask and size definitions.
   */
  #define IOLARGE_SHIFT		16
  #define IOLARGE_SIZE		(1UL << 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 << 0)
  #define IOPGD_SECTION		(2 << 0)
  #define IOPGD_SUPER		(1 << 18 | 2 << 0)
  
  #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 << 0)
  #define IOPTE_LARGE		(1 << 0)
  
  #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))
  
  static inline u32 iotlb_init_entry(struct iotlb_entry *e, u32 da, u32 pa,
  				   u32 flags)
  {
  	memset(e, 0, sizeof(*e));
  
  	e->da		= da;
  	e->pa		= pa;
  	e->valid	= 1;
  	/* FIXME: add OMAP1 support */
  	e->pgsz		= flags & MMU_CAM_PGSZ_MASK;
  	e->endian	= flags & MMU_RAM_ENDIAN_MASK;
  	e->elsz		= flags & MMU_RAM_ELSZ_MASK;
  	e->mixed	= flags & MMU_RAM_MIXED_MASK;
  
  	return iopgsz_to_bytes(e->pgsz);
  }
  
  #define to_iommu(dev)							\
  	(struct omap_iommu *)platform_get_drvdata(to_platform_device(dev))
  
  #endif /* __PLAT_OMAP_IOMMU_H */
  