1 files changed, 225 insertions, 0 deletions

diff --git a/drivers/iommu/omap-iommu.h b/drivers/iommu/omap-iommu.h
new file mode 100644
index 00000000000..12008420660
--- /dev/null
+++ b/drivers/iommu/omap-iommu.h
@@ -0,0 +1,225 @@
+/*
+ * omap iommu: main structures
+ *
+ * Copyright (C) 2008-2009 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.
+ */
+
+#if defined(CONFIG_ARCH_OMAP1)
+#error "iommu for this processor not implemented yet"
+#endif
+
+struct iotlb_entry {
+        u32 da;
+        u32 pa;
+        u32 pgsz, prsvd, valid;
+        union {
+                u16 ap;
+                struct {
+                        u32 endian, elsz, mixed;
+                };
+        };
+};
+
+struct omap_iommu {
+        const char      *name;
+        struct module   *owner;
+        void __iomem    *regbase;
+        struct device   *dev;
+        void            *isr_priv;
+        struct iommu_domain *domain;
+
+        unsigned int    refcount;
+        spinlock_t      iommu_lock;     /* global for this whole object */
+
+        /*
+         * We don't change iopgd for a situation like pgd for a task,
+         * but share it globally for each iommu.
+         */
+        u32             *iopgd;
+        spinlock_t      page_table_lock; /* protect iopgd */
+
+        int             nr_tlb_entries;
+
+        struct list_head        mmap;
+        struct mutex            mmap_lock; /* protect mmap */
+
+        void *ctx; /* iommu context: registres saved area */
+        u32 da_start;
+        u32 da_end;
+};
+
+struct cr_regs {
+        union {
+                struct {
+                        u16 cam_l;
+                        u16 cam_h;
+                };
+                u32 cam;
+        };
+        union {
+                struct {
+                        u16 ram_l;
+                        u16 ram_h;
+                };
+                u32 ram;
+        };
+};
+
+/* architecture specific functions */
+struct iommu_functions {
+        unsigned long   version;
+
+        int (*enable)(struct omap_iommu *obj);
+        void (*disable)(struct omap_iommu *obj);
+        void (*set_twl)(struct omap_iommu *obj, bool on);
+        u32 (*fault_isr)(struct omap_iommu *obj, u32 *ra);
+
+        void (*tlb_read_cr)(struct omap_iommu *obj, struct cr_regs *cr);
+        void (*tlb_load_cr)(struct omap_iommu *obj, struct cr_regs *cr);
+
+        struct cr_regs *(*alloc_cr)(struct omap_iommu *obj,
+                                                        struct iotlb_entry *e);
+        int (*cr_valid)(struct cr_regs *cr);
+        u32 (*cr_to_virt)(struct cr_regs *cr);
+        void (*cr_to_e)(struct cr_regs *cr, struct iotlb_entry *e);
+        ssize_t (*dump_cr)(struct omap_iommu *obj, struct cr_regs *cr,
+                                                        char *buf);
+
+        u32 (*get_pte_attr)(struct iotlb_entry *e);
+
+        void (*save_ctx)(struct omap_iommu *obj);
+        void (*restore_ctx)(struct omap_iommu *obj);
+        ssize_t (*dump_ctx)(struct omap_iommu *obj, char *buf, ssize_t len);
+};
+
+#ifdef CONFIG_IOMMU_API
+/**
+ * dev_to_omap_iommu() - retrieves an omap iommu object from a user device
+ * @dev: iommu client device
+ */
+static inline struct omap_iommu *dev_to_omap_iommu(struct device *dev)
+{
+        struct omap_iommu_arch_data *arch_data = dev->archdata.iommu;
+
+        return arch_data->iommu_dev;
+}
+#endif
+
+/*
+ * MMU Register offsets
+ */
+#define MMU_REVISION            0x00
+#define MMU_IRQSTATUS           0x18
+#define MMU_IRQENABLE           0x1c
+#define MMU_WALKING_ST          0x40
+#define MMU_CNTL                0x44
+#define MMU_FAULT_AD            0x48
+#define MMU_TTB                 0x4c
+#define MMU_LOCK                0x50
+#define MMU_LD_TLB              0x54
+#define MMU_CAM                 0x58
+#define MMU_RAM                 0x5c
+#define MMU_GFLUSH              0x60
+#define MMU_FLUSH_ENTRY         0x64
+#define MMU_READ_CAM            0x68
+#define MMU_READ_RAM            0x6c
+#define MMU_EMU_FAULT_AD        0x70
+
+#define MMU_REG_SIZE            256
+
+/*
+ * MMU Register bit definitions
+ */
+#define MMU_CAM_VATAG_SHIFT     12
+#define MMU_CAM_VATAG_MASK \
+        ((~0UL >> MMU_CAM_VATAG_SHIFT) << MMU_CAM_VATAG_SHIFT)
+#define MMU_CAM_P               (1 << 3)
+#define MMU_CAM_V               (1 << 2)
+#define MMU_CAM_PGSZ_MASK       3
+#define MMU_CAM_PGSZ_1M         (0 << 0)
+#define MMU_CAM_PGSZ_64K        (1 << 0)
+#define MMU_CAM_PGSZ_4K         (2 << 0)
+#define MMU_CAM_PGSZ_16M        (3 << 0)
+
+#define MMU_RAM_PADDR_SHIFT     12
+#define MMU_RAM_PADDR_MASK \
+        ((~0UL >> MMU_RAM_PADDR_SHIFT) << MMU_RAM_PADDR_SHIFT)
+
+#define MMU_RAM_ENDIAN_MASK     (1 << MMU_RAM_ENDIAN_SHIFT)
+#define MMU_RAM_ENDIAN_BIG      (1 << MMU_RAM_ENDIAN_SHIFT)
+
+#define MMU_RAM_ELSZ_MASK       (3 << MMU_RAM_ELSZ_SHIFT)
+#define MMU_RAM_ELSZ_8          (0 << MMU_RAM_ELSZ_SHIFT)
+#define MMU_RAM_ELSZ_16         (1 << MMU_RAM_ELSZ_SHIFT)
+#define MMU_RAM_ELSZ_32         (2 << MMU_RAM_ELSZ_SHIFT)
+#define MMU_RAM_ELSZ_NONE       (3 << MMU_RAM_ELSZ_SHIFT)
+#define MMU_RAM_MIXED_SHIFT     6
+#define MMU_RAM_MIXED_MASK      (1 << MMU_RAM_MIXED_SHIFT)
+#define MMU_RAM_MIXED           MMU_RAM_MIXED_MASK
+
+/*
+ * utilities for super page(16MB, 1MB, 64KB and 4KB)
+ */
+
+#define iopgsz_max(bytes)                       \
+        (((bytes) >= SZ_16M) ? SZ_16M :         \
+         ((bytes) >= SZ_1M)  ? SZ_1M  :         \
+         ((bytes) >= SZ_64K) ? SZ_64K :         \
+         ((bytes) >= SZ_4K)  ? SZ_4K  : 0)
+
+#define bytes_to_iopgsz(bytes)                          \
+        (((bytes) == SZ_16M) ? MMU_CAM_PGSZ_16M :       \
+         ((bytes) == SZ_1M)  ? MMU_CAM_PGSZ_1M  :       \
+         ((bytes) == SZ_64K) ? MMU_CAM_PGSZ_64K :       \
+         ((bytes) == SZ_4K)  ? MMU_CAM_PGSZ_4K  : -1)
+
+#define iopgsz_to_bytes(iopgsz)                         \
+        (((iopgsz) == MMU_CAM_PGSZ_16M) ? SZ_16M :      \
+         ((iopgsz) == MMU_CAM_PGSZ_1M)  ? SZ_1M  :      \
+         ((iopgsz) == MMU_CAM_PGSZ_64K) ? SZ_64K :      \
+         ((iopgsz) == MMU_CAM_PGSZ_4K)  ? SZ_4K  : 0)
+
+#define iopgsz_ok(bytes) (bytes_to_iopgsz(bytes) >= 0)
+
+/*
+ * global functions
+ */
+extern u32 omap_iommu_arch_version(void);
+
+extern void omap_iotlb_cr_to_e(struct cr_regs *cr, struct iotlb_entry *e);
+
+extern int
+omap_iopgtable_store_entry(struct omap_iommu *obj, struct iotlb_entry *e);
+
+extern void omap_iommu_save_ctx(struct device *dev);
+extern void omap_iommu_restore_ctx(struct device *dev);
+
+extern int omap_foreach_iommu_device(void *data,
+                                int (*fn)(struct device *, void *));
+
+extern int omap_install_iommu_arch(const struct iommu_functions *ops);
+extern void omap_uninstall_iommu_arch(const struct iommu_functions *ops);
+
+extern ssize_t
+omap_iommu_dump_ctx(struct omap_iommu *obj, char *buf, ssize_t len);
+extern size_t
+omap_dump_tlb_entries(struct omap_iommu *obj, char *buf, ssize_t len);
+
+/*
+ * register accessors
+ */
+static inline u32 iommu_read_reg(struct omap_iommu *obj, size_t offs)
+{
+        return __raw_readl(obj->regbase + offs);
+}
+
+static inline void iommu_write_reg(struct omap_iommu *obj, u32 val, size_t offs)
+{
+        __raw_writel(val, obj->regbase + offs);
+}