1 /* 2 * omap iommu: pagetable definitions 3 * 4 * Copyright (C) 2008-2010 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 /* 14 * "L2 table" address mask and size definitions. 15 */ 16 #define IOPGD_SHIFT 20 17 #define IOPGD_SIZE (1UL << IOPGD_SHIFT) 18 #define IOPGD_MASK (~(IOPGD_SIZE - 1)) 19 20 /* 21 * "section" address mask and size definitions. 22 */ 23 #define IOSECTION_SHIFT 20 24 #define IOSECTION_SIZE (1UL << IOSECTION_SHIFT) 25 #define IOSECTION_MASK (~(IOSECTION_SIZE - 1)) 26 27 /* 28 * "supersection" address mask and size definitions. 29 */ 30 #define IOSUPER_SHIFT 24 31 #define IOSUPER_SIZE (1UL << IOSUPER_SHIFT) 32 #define IOSUPER_MASK (~(IOSUPER_SIZE - 1)) 33 34 #define PTRS_PER_IOPGD (1UL << (32 - IOPGD_SHIFT)) 35 #define IOPGD_TABLE_SIZE (PTRS_PER_IOPGD * sizeof(u32)) 36 37 /* 38 * "small page" address mask and size definitions. 39 */ 40 #define IOPTE_SHIFT 12 41 #define IOPTE_SIZE (1UL << IOPTE_SHIFT) 42 #define IOPTE_MASK (~(IOPTE_SIZE - 1)) 43 44 /* 45 * "large page" address mask and size definitions. 46 */ 47 #define IOLARGE_SHIFT 16 48 #define IOLARGE_SIZE (1UL << IOLARGE_SHIFT) 49 #define IOLARGE_MASK (~(IOLARGE_SIZE - 1)) 50 51 #define PTRS_PER_IOPTE (1UL << (IOPGD_SHIFT - IOPTE_SHIFT)) 52 #define IOPTE_TABLE_SIZE (PTRS_PER_IOPTE * sizeof(u32)) 53 54 #define IOPAGE_MASK IOPTE_MASK 55 56 /** 57 * omap_iommu_translate() - va to pa translation 58 * @d: omap iommu descriptor 59 * @va: virtual address 60 * @mask: omap iommu descriptor mask 61 * 62 * va to pa translation 63 */ 64 static inline phys_addr_t omap_iommu_translate(u32 d, u32 va, u32 mask) 65 { 66 return (d & mask) | (va & (~mask)); 67 } 68 69 /* 70 * some descriptor attributes. 71 */ 72 #define IOPGD_TABLE (1 << 0) 73 #define IOPGD_SECTION (2 << 0) 74 #define IOPGD_SUPER (1 << 18 | 2 << 0) 75 76 #define iopgd_is_table(x) (((x) & 3) == IOPGD_TABLE) 77 #define iopgd_is_section(x) (((x) & (1 << 18 | 3)) == IOPGD_SECTION) 78 #define iopgd_is_super(x) (((x) & (1 << 18 | 3)) == IOPGD_SUPER) 79 80 #define IOPTE_SMALL (2 << 0) 81 #define IOPTE_LARGE (1 << 0) 82 83 #define iopte_is_small(x) (((x) & 2) == IOPTE_SMALL) 84 #define iopte_is_large(x) (((x) & 3) == IOPTE_LARGE) 85 86 /* to find an entry in a page-table-directory */ 87 #define iopgd_index(da) (((da) >> IOPGD_SHIFT) & (PTRS_PER_IOPGD - 1)) 88 #define iopgd_offset(obj, da) ((obj)->iopgd + iopgd_index(da)) 89 90 #define iopgd_page_paddr(iopgd) (*iopgd & ~((1 << 10) - 1)) 91 #define iopgd_page_vaddr(iopgd) ((u32 *)phys_to_virt(iopgd_page_paddr(iopgd))) 92 93 /* to find an entry in the second-level page table. */ 94 #define iopte_index(da) (((da) >> IOPTE_SHIFT) & (PTRS_PER_IOPTE - 1)) 95 #define iopte_offset(iopgd, da) (iopgd_page_vaddr(iopgd) + iopte_index(da)) 96 97 #define to_iommu(dev) \ 98 (struct omap_iommu *)platform_get_drvdata(to_platform_device(dev)) 99