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iommu.h

/*
 * 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.
 */

#ifndef __MACH_IOMMU_H
#define __MACH_IOMMU_H

00016 struct iotlb_entry {
      u32 da;
      u32 pa;
      u32 pgsz, prsvd, valid;
      union {
            u16 ap;
            struct {
                  u32 endian, elsz, mixed;
            };
      };
};

00028 struct iommu {
      const char  *name;
      struct module     *owner;
      struct clk  *clk;
      void __iomem      *regbase;
      struct device     *dev;

      unsigned int      refcount;
      struct mutex      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 */

      int (*isr)(struct iommu *obj);

      void *ctx; /* iommu context: registres saved area */
      u32 da_start;
      u32 da_end;
};

00057 struct cr_regs {
      union {
            struct {
                  u16 cam_l;
                  u16 cam_h;
            };
            u32 cam;
      };
      union {
            struct {
                  u16 ram_l;
                  u16 ram_h;
            };
            u32 ram;
      };
};

00074 struct iotlb_lock {
      short base;
      short vict;
};

/* architecture specific functions */
00080 struct iommu_functions {
      unsigned long     version;

      int (*enable)(struct iommu *obj);
      void (*disable)(struct iommu *obj);
      void (*set_twl)(struct iommu *obj, bool on);
      u32 (*fault_isr)(struct iommu *obj, u32 *ra);

      void (*tlb_read_cr)(struct iommu *obj, struct cr_regs *cr);
      void (*tlb_load_cr)(struct iommu *obj, struct cr_regs *cr);

      struct cr_regs *(*alloc_cr)(struct 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 iommu *obj, struct cr_regs *cr, char *buf);

      u32 (*get_pte_attr)(struct iotlb_entry *e);

      void (*save_ctx)(struct iommu *obj);
      void (*restore_ctx)(struct iommu *obj);
      ssize_t (*dump_ctx)(struct iommu *obj, char *buf, ssize_t len);
};

00104 struct iommu_platform_data {
      const char *name;
      const char *clk_name;
      const int nr_tlb_entries;
      u32 da_start;
      u32 da_end;
};

#if defined(CONFIG_ARCH_OMAP1)
#error "iommu for this processor not implemented yet"
#else
#include <plat/iommu2.h>
#endif

/*
 * 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 iommu_arch_version(void);

extern void iotlb_cr_to_e(struct cr_regs *cr, struct iotlb_entry *e);
extern u32 iotlb_cr_to_virt(struct cr_regs *cr);

extern int load_iotlb_entry(struct iommu *obj, struct iotlb_entry *e);
extern void iommu_set_twl(struct iommu *obj, bool on);
extern void flush_iotlb_page(struct iommu *obj, u32 da);
extern void flush_iotlb_range(struct iommu *obj, u32 start, u32 end);
extern void flush_iotlb_all(struct iommu *obj);

extern int iopgtable_store_entry(struct iommu *obj, struct iotlb_entry *e);
extern size_t iopgtable_clear_entry(struct iommu *obj, u32 iova);

extern int iommu_set_da_range(struct iommu *obj, u32 start, u32 end);
extern struct iommu *iommu_get(const char *name);
extern void iommu_put(struct iommu *obj);

extern void iommu_save_ctx(struct iommu *obj);
extern void iommu_restore_ctx(struct iommu *obj);

extern int install_iommu_arch(const struct iommu_functions *ops);
extern void uninstall_iommu_arch(const struct iommu_functions *ops);

extern int foreach_iommu_device(void *data,
                        int (*fn)(struct device *, void *));

extern ssize_t iommu_dump_ctx(struct iommu *obj, char *buf, ssize_t len);
extern size_t dump_tlb_entries(struct iommu *obj, char *buf, ssize_t len);

#endif /* __MACH_IOMMU_H */

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