drivers/iommu/omap-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 #if defined(CONFIG_ARCH_OMAP1)
  14 #error "iommu for this processor not implemented yet"
  15 #endif
  16
  17 struct iotlb_entry {
  18         u32 da;
  19         u32 pa;
  20         u32 pgsz, prsvd, valid;
  21         union {
  22                 u16 ap;
  23                 struct {
  24                         u32 endian, elsz, mixed;
  25                 };
  26         };
  27 };
  28
  29 struct omap_iommu {
  30         const char      *name;
  31         struct module   *owner;
  32         void __iomem    *regbase;
  33         struct device   *dev;
  34         void            *isr_priv;
  35         struct iommu_domain *domain;
  36
  37         unsigned int    refcount;
  38         spinlock_t      iommu_lock;     /* global for this whole object */
  39
  40         /*
  41          * We don't change iopgd for a situation like pgd for a task,
  42          * but share it globally for each iommu.
  43          */
  44         u32             *iopgd;
  45         spinlock_t      page_table_lock; /* protect iopgd */
  46
  47         int             nr_tlb_entries;
  48
  49         struct list_head        mmap;
  50         struct mutex            mmap_lock; /* protect mmap */
  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 /* architecture specific functions */
  75 struct iommu_functions {
  76         unsigned long   version;
  77
  78         int (*enable)(struct omap_iommu *obj);
  79         void (*disable)(struct omap_iommu *obj);
  80         void (*set_twl)(struct omap_iommu *obj, bool on);
  81         u32 (*fault_isr)(struct omap_iommu *obj, u32 *ra);
  82
  83         void (*tlb_read_cr)(struct omap_iommu *obj, struct cr_regs *cr);
  84         void (*tlb_load_cr)(struct omap_iommu *obj, struct cr_regs *cr);
  85
  86         struct cr_regs *(*alloc_cr)(struct omap_iommu *obj,
  87                                                         struct iotlb_entry *e);
  88         int (*cr_valid)(struct cr_regs *cr);
  89         u32 (*cr_to_virt)(struct cr_regs *cr);
  90         void (*cr_to_e)(struct cr_regs *cr, struct iotlb_entry *e);
  91         ssize_t (*dump_cr)(struct omap_iommu *obj, struct cr_regs *cr,
  92                                                         char *buf);
  93
  94         u32 (*get_pte_attr)(struct iotlb_entry *e);
  95
  96         void (*save_ctx)(struct omap_iommu *obj);
  97         void (*restore_ctx)(struct omap_iommu *obj);
  98         ssize_t (*dump_ctx)(struct omap_iommu *obj, char *buf, ssize_t len);
  99 };
 100
 101 #ifdef CONFIG_IOMMU_API
 102 /**
 103  * dev_to_omap_iommu() - retrieves an omap iommu object from a user device
 104  * @dev: iommu client device
 105  */
 106 static inline struct omap_iommu *dev_to_omap_iommu(struct device *dev)
 107 {
 108         struct omap_iommu_arch_data *arch_data = dev->archdata.iommu;
 109
 110         return arch_data->iommu_dev;
 111 }
 112 #endif
 113
 114 /*
 115  * MMU Register offsets
 116  */
 117 #define MMU_REVISION            0x00
 118 #define MMU_IRQSTATUS           0x18
 119 #define MMU_IRQENABLE           0x1c
 120 #define MMU_WALKING_ST          0x40
 121 #define MMU_CNTL                0x44
 122 #define MMU_FAULT_AD            0x48
 123 #define MMU_TTB                 0x4c
 124 #define MMU_LOCK                0x50
 125 #define MMU_LD_TLB              0x54
 126 #define MMU_CAM                 0x58
 127 #define MMU_RAM                 0x5c
 128 #define MMU_GFLUSH              0x60
 129 #define MMU_FLUSH_ENTRY         0x64
 130 #define MMU_READ_CAM            0x68
 131 #define MMU_READ_RAM            0x6c
 132 #define MMU_EMU_FAULT_AD        0x70
 133
 134 #define MMU_REG_SIZE            256
 135
 136 /*
 137  * MMU Register bit definitions
 138  */
 139 #define MMU_CAM_VATAG_SHIFT     12
 140 #define MMU_CAM_VATAG_MASK \
 141         ((~0UL >> MMU_CAM_VATAG_SHIFT) << MMU_CAM_VATAG_SHIFT)
 142 #define MMU_CAM_P               (1 << 3)
 143 #define MMU_CAM_V               (1 << 2)
 144 #define MMU_CAM_PGSZ_MASK       3
 145 #define MMU_CAM_PGSZ_1M         (0 << 0)
 146 #define MMU_CAM_PGSZ_64K        (1 << 0)
 147 #define MMU_CAM_PGSZ_4K         (2 << 0)
 148 #define MMU_CAM_PGSZ_16M        (3 << 0)
 149
 150 #define MMU_RAM_PADDR_SHIFT     12
 151 #define MMU_RAM_PADDR_MASK \
 152         ((~0UL >> MMU_RAM_PADDR_SHIFT) << MMU_RAM_PADDR_SHIFT)
 153
 154 #define MMU_RAM_ENDIAN_MASK     (1 << MMU_RAM_ENDIAN_SHIFT)
 155 #define MMU_RAM_ENDIAN_BIG      (1 << MMU_RAM_ENDIAN_SHIFT)
 156
 157 #define MMU_RAM_ELSZ_MASK       (3 << MMU_RAM_ELSZ_SHIFT)
 158 #define MMU_RAM_ELSZ_8          (0 << MMU_RAM_ELSZ_SHIFT)
 159 #define MMU_RAM_ELSZ_16         (1 << MMU_RAM_ELSZ_SHIFT)
 160 #define MMU_RAM_ELSZ_32         (2 << MMU_RAM_ELSZ_SHIFT)
 161 #define MMU_RAM_ELSZ_NONE       (3 << MMU_RAM_ELSZ_SHIFT)
 162 #define MMU_RAM_MIXED_SHIFT     6
 163 #define MMU_RAM_MIXED_MASK      (1 << MMU_RAM_MIXED_SHIFT)
 164 #define MMU_RAM_MIXED           MMU_RAM_MIXED_MASK
 165
 166 /*
 167  * utilities for super page(16MB, 1MB, 64KB and 4KB)
 168  */
 169
 170 #define iopgsz_max(bytes)                       \
 171         (((bytes) >= SZ_16M) ? SZ_16M :         \
 172          ((bytes) >= SZ_1M)  ? SZ_1M  :         \
 173          ((bytes) >= SZ_64K) ? SZ_64K :         \
 174          ((bytes) >= SZ_4K)  ? SZ_4K  : 0)
 175
 176 #define bytes_to_iopgsz(bytes)                          \
 177         (((bytes) == SZ_16M) ? MMU_CAM_PGSZ_16M :       \
 178          ((bytes) == SZ_1M)  ? MMU_CAM_PGSZ_1M  :       \
 179          ((bytes) == SZ_64K) ? MMU_CAM_PGSZ_64K :       \
 180          ((bytes) == SZ_4K)  ? MMU_CAM_PGSZ_4K  : -1)
 181
 182 #define iopgsz_to_bytes(iopgsz)                         \
 183         (((iopgsz) == MMU_CAM_PGSZ_16M) ? SZ_16M :      \
 184          ((iopgsz) == MMU_CAM_PGSZ_1M)  ? SZ_1M  :      \
 185          ((iopgsz) == MMU_CAM_PGSZ_64K) ? SZ_64K :      \
 186          ((iopgsz) == MMU_CAM_PGSZ_4K)  ? SZ_4K  : 0)
 187
 188 #define iopgsz_ok(bytes) (bytes_to_iopgsz(bytes) >= 0)
 189
 190 /*
 191  * global functions
 192  */
 193 extern u32 omap_iommu_arch_version(void);
 194
 195 extern void omap_iotlb_cr_to_e(struct cr_regs *cr, struct iotlb_entry *e);
 196
 197 extern int
 198 omap_iopgtable_store_entry(struct omap_iommu *obj, struct iotlb_entry *e);
 199
 200 extern void omap_iommu_save_ctx(struct device *dev);
 201 extern void omap_iommu_restore_ctx(struct device *dev);
 202
 203 extern int omap_foreach_iommu_device(void *data,
 204                                 int (*fn)(struct device *, void *));
 205
 206 extern int omap_install_iommu_arch(const struct iommu_functions *ops);
 207 extern void omap_uninstall_iommu_arch(const struct iommu_functions *ops);
 208
 209 extern ssize_t
 210 omap_iommu_dump_ctx(struct omap_iommu *obj, char *buf, ssize_t len);
 211 extern size_t
 212 omap_dump_tlb_entries(struct omap_iommu *obj, char *buf, ssize_t len);
 213
 214 /*
 215  * register accessors
 216  */
 217 static inline u32 iommu_read_reg(struct omap_iommu *obj, size_t offs)
 218 {
 219         return __raw_readl(obj->regbase + offs);
 220 }
 221
 222 static inline void iommu_write_reg(struct omap_iommu *obj, u32 val, size_t offs)
 223 {
 224         __raw_writel(val, obj->regbase + offs);
 225 }