arch/arm/plat-omap/include/plat/iommu.h

   1 /*
   2  * omap iommu: main structures
   3  *
   4  * Copyright (C) 2008-2009 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 __MACH_IOMMU_H
  14 #define __MACH_IOMMU_H
  15
  16 struct iotlb_entry {
  17         u32 da;
  18         u32 pa;
  19         u32 pgsz, prsvd, valid;
  20         union {
  21                 u16 ap;
  22                 struct {
  23                         u32 endian, elsz, mixed;
  24                 };
  25         };
  26 };
  27
  28 struct iommu {
  29         const char      *name;
  30         struct module   *owner;
  31         struct clk      *clk;
  32         void __iomem    *regbase;
  33         struct device   *dev;
  34
  35         unsigned int    refcount;
  36         struct mutex    iommu_lock;     /* global for this whole object */
  37
  38         /*
  39          * We don't change iopgd for a situation like pgd for a task,
  40          * but share it globally for each iommu.
  41          */
  42         u32             *iopgd;
  43         spinlock_t      page_table_lock; /* protect iopgd */
  44
  45         int             nr_tlb_entries;
  46
  47         struct list_head        mmap;
  48         struct mutex            mmap_lock; /* protect mmap */
  49
  50         int (*isr)(struct iommu *obj);
  51
  52         void *ctx; /* iommu context: registres saved area */
  53         u32 da_start;
  54         u32 da_end;
  55 };
  56
  57 struct cr_regs {
  58         union {
  59                 struct {
  60                         u16 cam_l;
  61                         u16 cam_h;
  62                 };
  63                 u32 cam;
  64         };
  65         union {
  66                 struct {
  67                         u16 ram_l;
  68                         u16 ram_h;
  69                 };
  70                 u32 ram;
  71         };
  72 };
  73
  74 struct iotlb_lock {
  75         short base;
  76         short vict;
  77 };
  78
  79 /* architecture specific functions */
  80 struct iommu_functions {
  81         unsigned long   version;
  82
  83         int (*enable)(struct iommu *obj);
  84         void (*disable)(struct iommu *obj);
  85         void (*set_twl)(struct iommu *obj, bool on);
  86         u32 (*fault_isr)(struct iommu *obj, u32 *ra);
  87
  88         void (*tlb_read_cr)(struct iommu *obj, struct cr_regs *cr);
  89         void (*tlb_load_cr)(struct iommu *obj, struct cr_regs *cr);
  90
  91         struct cr_regs *(*alloc_cr)(struct iommu *obj, struct iotlb_entry *e);
  92         int (*cr_valid)(struct cr_regs *cr);
  93         u32 (*cr_to_virt)(struct cr_regs *cr);
  94         void (*cr_to_e)(struct cr_regs *cr, struct iotlb_entry *e);
  95         ssize_t (*dump_cr)(struct iommu *obj, struct cr_regs *cr, char *buf);
  96
  97         u32 (*get_pte_attr)(struct iotlb_entry *e);
  98
  99         void (*save_ctx)(struct iommu *obj);
 100         void (*restore_ctx)(struct iommu *obj);
 101         ssize_t (*dump_ctx)(struct iommu *obj, char *buf, ssize_t len);
 102 };
 103
 104 struct iommu_platform_data {
 105         const char *name;
 106         const char *clk_name;
 107         const int nr_tlb_entries;
 108         u32 da_start;
 109         u32 da_end;
 110 };
 111
 112 #if defined(CONFIG_ARCH_OMAP1)
 113 #error "iommu for this processor not implemented yet"
 114 #else
 115 #include <plat/iommu2.h>
 116 #endif
 117
 118 /*
 119  * utilities for super page(16MB, 1MB, 64KB and 4KB)
 120  */
 121
 122 #define iopgsz_max(bytes)                       \
 123         (((bytes) >= SZ_16M) ? SZ_16M :         \
 124          ((bytes) >= SZ_1M)  ? SZ_1M  :         \
 125          ((bytes) >= SZ_64K) ? SZ_64K :         \
 126          ((bytes) >= SZ_4K)  ? SZ_4K  : 0)
 127
 128 #define bytes_to_iopgsz(bytes)                          \
 129         (((bytes) == SZ_16M) ? MMU_CAM_PGSZ_16M :       \
 130          ((bytes) == SZ_1M)  ? MMU_CAM_PGSZ_1M  :       \
 131          ((bytes) == SZ_64K) ? MMU_CAM_PGSZ_64K :       \
 132          ((bytes) == SZ_4K)  ? MMU_CAM_PGSZ_4K  : -1)
 133
 134 #define iopgsz_to_bytes(iopgsz)                         \
 135         (((iopgsz) == MMU_CAM_PGSZ_16M) ? SZ_16M :      \
 136          ((iopgsz) == MMU_CAM_PGSZ_1M)  ? SZ_1M  :      \
 137          ((iopgsz) == MMU_CAM_PGSZ_64K) ? SZ_64K :      \
 138          ((iopgsz) == MMU_CAM_PGSZ_4K)  ? SZ_4K  : 0)
 139
 140 #define iopgsz_ok(bytes) (bytes_to_iopgsz(bytes) >= 0)
 141
 142 /*
 143  * global functions
 144  */
 145 extern u32 iommu_arch_version(void);
 146
 147 extern void iotlb_cr_to_e(struct cr_regs *cr, struct iotlb_entry *e);
 148 extern u32 iotlb_cr_to_virt(struct cr_regs *cr);
 149
 150 extern int load_iotlb_entry(struct iommu *obj, struct iotlb_entry *e);
 151 extern void iommu_set_twl(struct iommu *obj, bool on);
 152 extern void flush_iotlb_page(struct iommu *obj, u32 da);
 153 extern void flush_iotlb_range(struct iommu *obj, u32 start, u32 end);
 154 extern void flush_iotlb_all(struct iommu *obj);
 155
 156 extern int iopgtable_store_entry(struct iommu *obj, struct iotlb_entry *e);
 157 extern size_t iopgtable_clear_entry(struct iommu *obj, u32 iova);
 158
 159 extern int iommu_set_da_range(struct iommu *obj, u32 start, u32 end);
 160 extern struct iommu *iommu_get(const char *name);
 161 extern void iommu_put(struct iommu *obj);
 162
 163 extern void iommu_save_ctx(struct iommu *obj);
 164 extern void iommu_restore_ctx(struct iommu *obj);
 165
 166 extern int install_iommu_arch(const struct iommu_functions *ops);
 167 extern void uninstall_iommu_arch(const struct iommu_functions *ops);
 168
 169 extern int foreach_iommu_device(void *data,
 170                                 int (*fn)(struct device *, void *));
 171
 172 extern ssize_t iommu_dump_ctx(struct iommu *obj, char *buf, ssize_t len);
 173 extern size_t dump_tlb_entries(struct iommu *obj, char *buf, ssize_t len);
 174
 175 #endif /* __MACH_IOMMU_H */