text: /*	$OpenBSD: iommuvar.h,v 1.15 2009/05/04 16:48:37 oga Exp $	*/
  /*	$NetBSD: iommuvar.h,v 1.9 2001/10/07 20:30:41 eeh Exp $	*/
  
  /*
   * Copyright (c) 2003 Henric Jungheim
   * Copyright (c) 1999 Matthew R. Green
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. The name of the author may not be used to endorse or promote products
   *    derived from this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
   * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
   * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   */
  
  #ifndef _SPARC64_DEV_IOMMUVAR_H_
  #define _SPARC64_DEV_IOMMUVAR_H_
  
  #ifndef _SYS_TREE_H_
  #include <sys/tree.h>
  #endif
  
  #include <sys/mutex.h>
  
  /*
   * per-Streaming Buffer state
   */
  struct strbuf_ctl {
  	bus_space_tag_t		sb_bustag;	/* streaming buffer registers */
  	bus_space_handle_t	sb_sb;		/* Handle for our regs */
  	struct iommu_state	*sb_iommu;	/* Associated IOMMU */
  	/*
  	 * Since implementing the per-map IOMMU state, these per-STC
  	 * flush areas are not used other than as a boolean flag to indicate
  	 * the presence of a working and enabled STC.  For inconsistency's
  	 * sake, the "sb" pointers of iommu_state are sometimes used for the
  	 * same purpose.  This should be consolidated.  DEFINATELY, since
  	 * mutex operations must happen at this level.
  	 */
  	struct mutex		sb_mtx;		/* one flush at a time */
  
  	paddr_t			sb_flushpa;	/* to flush streaming buffers */
  	volatile int64_t	*sb_flush;
  };
  
  /*
   * per-map STC flush area
   */
  struct strbuf_flush {
  	char	sbf_area[0x80];		/* Holds 64-byte long/aligned buffer */
  	void	*sbf_flush;		/* Kernel virtual address of buffer */
  	paddr_t	sbf_flushpa;		/* Physical address of buffer area */
  };
  
  /* 
   * per-map DVMA page table
   */
  struct iommu_page_entry {
  	SPLAY_ENTRY(iommu_page_entry) ipe_node;
  	paddr_t		ipe_pa;
  	bus_addr_t	ipe_va;
  };
  struct iommu_page_map {
  	SPLAY_HEAD(iommu_page_tree, iommu_page_entry) ipm_tree;
  	int ipm_maxpage;	/* Size of allocated page map */
  	int ipm_pagecnt;	/* Number of entries in use */
  	struct iommu_page_entry	ipm_map[1];
  };
  
  /*
   * per-map IOMMU state
   *
   * This is what bus_dvmamap_t'c _dm_cookie should be pointing to.
   */
  struct iommu_map_state {
  	struct strbuf_flush ims_flush;	/* flush should be first (alignment) */
  	struct strbuf_ctl *ims_sb;	/* Link to parent */
  	struct iommu_state *ims_iommu;
  	int ims_flags;
  	struct iommu_page_map ims_map;	/* map must be last (array at end) */
  };
  #define IOMMU_MAP_STREAM	1
  
  /*
   * per-IOMMU state
   */
  struct iommu_state {
  	paddr_t			is_ptsb;	/* TSB physical address */
  	int64_t			*is_tsb;	/* TSB virtual address */
  	int			is_tsbsize;	/* 0 = 8K, ... */
  	u_int			is_dvmabase;
  	u_int			is_dvmaend;
  	int64_t			is_cr;		/* Control register value */
  	struct mutex		is_mtx;
  	struct extent		*is_dvmamap;	/* DVMA map for this instance */
  	int			is_flags;
  #define IOMMU_FLUSH_CACHE	0x00000001
  
  	struct strbuf_ctl	*is_sb[2];	/* Streaming buffers if any */
  
  	/* copies of our parents state, to allow us to be self contained */
  	bus_space_tag_t		is_bustag;	/* our bus tag */
  	bus_space_handle_t	is_iommu;	/* IOMMU registers */
  	uint64_t		is_devhandle;
  };
  
  /* interfaces for PCI/SBus code */
  void	iommu_init(char *, struct iommu_state *, int, u_int32_t);
  void	iommu_reset(struct iommu_state *);
  paddr_t iommu_extract(struct iommu_state *, bus_addr_t);
  int64_t iommu_lookup_tte(struct iommu_state *, bus_addr_t);
  int64_t iommu_fetch_tte(struct iommu_state *, paddr_t);
  /* bus_dma_tag_t implementation functions */
  int	iommu_dvmamap_create(bus_dma_tag_t, bus_dma_tag_t, struct strbuf_ctl *,
  	    bus_size_t, int, bus_size_t, bus_size_t, int, bus_dmamap_t *);
  void	iommu_dvmamap_destroy(bus_dma_tag_t, bus_dma_tag_t, bus_dmamap_t);
  int	iommu_dvmamap_load(bus_dma_tag_t, bus_dma_tag_t, bus_dmamap_t, void *,
  	    bus_size_t, struct proc *, int);
  void	iommu_dvmamap_unload(bus_dma_tag_t, bus_dma_tag_t, bus_dmamap_t);
  int	iommu_dvmamap_load_raw(bus_dma_tag_t, bus_dma_tag_t, bus_dmamap_t,
  	    bus_dma_segment_t *, int, bus_size_t, int);
  void	iommu_dvmamap_sync(bus_dma_tag_t, bus_dma_tag_t, bus_dmamap_t,
  	    bus_addr_t, bus_size_t, int);
  int	iommu_dvmamem_alloc(bus_dma_tag_t, bus_dma_tag_t, bus_size_t,
  	    bus_size_t, bus_size_t, bus_dma_segment_t *, int, int *, int);
  void	iommu_dvmamem_free(bus_dma_tag_t, bus_dma_tag_t, bus_dma_segment_t *,
  	    int);
  
  #define IOMMUREG_READ(is, reg)				\
  	bus_space_read_8((is)->is_bustag,		\
  		(is)->is_iommu,				\
  		IOMMUREG(reg))	
  
  #define IOMMUREG_WRITE(is, reg, v)			\
  	bus_space_write_8((is)->is_bustag,		\
  		(is)->is_iommu,				\
  		IOMMUREG(reg),				\
  		(v))
  
  #endif /* _SPARC64_DEV_IOMMUVAR_H_ */
  
  