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 #ifndef _OMAP_IOPGTABLE_H 14 #define _OMAP_IOPGTABLE_H 15 16 #include <linux/bitops.h> 17 18 /* 19 * "L2 table" address mask and size definitions. 20 */ 21 #define IOPGD_SHIFT 20 22 #define IOPGD_SIZE BIT(IOPGD_SHIFT) 23 #define IOPGD_MASK (~(IOPGD_SIZE - 1)) 24 25 /* 26 * "section" address mask and size definitions. 27 */ 28 #define IOSECTION_SHIFT 20 29 #define IOSECTION_SIZE BIT(IOSECTION_SHIFT) 30 #define IOSECTION_MASK (~(IOSECTION_SIZE - 1)) 31 32 /* 33 * "supersection" address mask and size definitions. 34 */ 35 #define IOSUPER_SHIFT 24 36 #define IOSUPER_SIZE BIT(IOSUPER_SHIFT) 37 #define IOSUPER_MASK (~(IOSUPER_SIZE - 1)) 38 39 #define PTRS_PER_IOPGD (1UL << (32 - IOPGD_SHIFT)) 40 #define IOPGD_TABLE_SIZE (PTRS_PER_IOPGD * sizeof(u32)) 41 42 /* 43 * "small page" address mask and size definitions. 44 */ 45 #define IOPTE_SHIFT 12 46 #define IOPTE_SIZE BIT(IOPTE_SHIFT) 47 #define IOPTE_MASK (~(IOPTE_SIZE - 1)) 48 49 /* 50 * "large page" address mask and size definitions. 51 */ 52 #define IOLARGE_SHIFT 16 53 #define IOLARGE_SIZE BIT(IOLARGE_SHIFT) 54 #define IOLARGE_MASK (~(IOLARGE_SIZE - 1)) 55 56 #define PTRS_PER_IOPTE (1UL << (IOPGD_SHIFT - IOPTE_SHIFT)) 57 #define IOPTE_TABLE_SIZE (PTRS_PER_IOPTE * sizeof(u32)) 58 59 #define IOPAGE_MASK IOPTE_MASK 60 61 /** 62 * omap_iommu_translate() - va to pa translation 63 * @d: omap iommu descriptor 64 * @va: virtual address 65 * @mask: omap iommu descriptor mask 66 * 67 * va to pa translation 68 */ 69 static inline phys_addr_t omap_iommu_translate(u32 d, u32 va, u32 mask) 70 { 71 return (d & mask) | (va & (~mask)); 72 } 73 74 /* 75 * some descriptor attributes. 76 */ 77 #define IOPGD_TABLE (1) 78 #define IOPGD_SECTION (2) 79 #define IOPGD_SUPER (BIT(18) | IOPGD_SECTION) 80 81 #define iopgd_is_table(x) (((x) & 3) == IOPGD_TABLE) 82 #define iopgd_is_section(x) (((x) & (1 << 18 | 3)) == IOPGD_SECTION) 83 #define iopgd_is_super(x) (((x) & (1 << 18 | 3)) == IOPGD_SUPER) 84 85 #define IOPTE_SMALL (2) 86 #define IOPTE_LARGE (1) 87 88 #define iopte_is_small(x) (((x) & 2) == IOPTE_SMALL) 89 #define iopte_is_large(x) (((x) & 3) == IOPTE_LARGE) 90 91 /* to find an entry in a page-table-directory */ 92 #define iopgd_index(da) (((da) >> IOPGD_SHIFT) & (PTRS_PER_IOPGD - 1)) 93 #define iopgd_offset(obj, da) ((obj)->iopgd + iopgd_index(da)) 94 95 #define iopgd_page_paddr(iopgd) (*iopgd & ~((1 << 10) - 1)) 96 #define iopgd_page_vaddr(iopgd) ((u32 *)phys_to_virt(iopgd_page_paddr(iopgd))) 97 98 /* to find an entry in the second-level page table. */ 99 #define iopte_index(da) (((da) >> IOPTE_SHIFT) & (PTRS_PER_IOPTE - 1)) 100 #define iopte_offset(iopgd, da) (iopgd_page_vaddr(iopgd) + iopte_index(da)) 101 102 #endif /* _OMAP_IOPGTABLE_H */ 103