/*
 * 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.
 *
 *	from: NetBSD: iommuvar.h,v 1.9 2001/07/20 00:07:13 eeh Exp
 *
 * $FreeBSD$
 */

#ifndef _MACHINE_IOMMUVAR_H_
#define _MACHINE_IOMMUVAR_H_

#define	IO_PAGE_SIZE		PAGE_SIZE_8K
#define	IO_PAGE_MASK		PAGE_MASK_8K
#define	IO_PAGE_SHIFT		PAGE_SHIFT_8K
#define	round_io_page(x)	round_page(x)
#define	trunc_io_page(x)	trunc_page(x)

/*
 * per-IOMMU state
 */
struct iommu_state {
	int			is_tsbsize;	/* 0 = 8K, ... */
	u_int64_t		is_dvmabase;
	int64_t			is_cr;		/* IOMMU control register value */

	vm_paddr_t		is_flushpa[2];
	volatile int64_t	*is_flushva[2];
	/*
	 * When a flush is completed, 64 bytes will be stored at the given
	 * location, the first double word being 1, to indicate completion.
	 * The lower 6 address bits are ignored, so the addresses need to be
	 * suitably aligned; over-allocate a large enough margin to be able
	 * to adjust it.
	 * Two such buffers are needed.
	 * Needs to be volatile or egcs optimizes away loads.
	 */
	volatile char		is_flush[STRBUF_FLUSHSYNC_NBYTES * 3 - 1];

	/* 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_bushandle;
	bus_addr_t		is_iommu;	/* IOMMU registers */
	bus_addr_t		is_sb[2];	/* streaming buffer */
	bus_addr_t		is_dtag;	/* tag diagnostics access */
	bus_addr_t		is_ddram;	/* data ram diag. access */
	bus_addr_t		is_dqueue;	/* LRU queue diag. access */
	bus_addr_t		is_dva;		/* VA diag. register */
	bus_addr_t		is_dtcmp;	/* tag compare diag. access */

	STAILQ_ENTRY(iommu_state)	is_link;
};

/* interfaces for PCI/SBUS code */
void iommu_init(char *, struct iommu_state *, int, u_int32_t, int);
void iommu_reset(struct iommu_state *);
void iommu_enter(struct iommu_state *, vm_offset_t, vm_paddr_t, int);
void iommu_remove(struct iommu_state *, vm_offset_t, size_t);
void iommu_decode_fault(struct iommu_state *, vm_offset_t);

extern struct bus_dma_methods iommu_dma_methods;

#endif /* !_MACHINE_IOMMUVAR_H_ */