/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2000 Doug Rabson
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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 _SYS_AGPIO_H_
#define _SYS_AGPIO_H_

/*
 * The AGP gatt uses 4k pages irrespective of the host page size.
 */
#define AGP_PAGE_SIZE		4096
#define AGP_PAGE_SHIFT		12

/*
 * Macros to manipulate AGP mode words.
 *
 * SBA = Sideband Address Port
 * FW  = Fast Writes
 */
#define AGP_MODE_GET_RQ(x)		(((x) & 0xff000000U) >> 24)
#define AGP_MODE_GET_ARQSZ(x)		(((x) & 0x0000e000U) >> 13)
#define AGP_MODE_GET_CAL(x)		(((x) & 0x00001c00U) >> 10)
#define AGP_MODE_GET_SBA(x)		(((x) & 0x00000200U) >> 9)
#define AGP_MODE_GET_AGP(x)		(((x) & 0x00000100U) >> 8)
#define AGP_MODE_GET_GART_64(x)		(((x) & 0x00000080U) >> 7)
#define AGP_MODE_GET_OVER_4G(x)		(((x) & 0x00000020U) >> 5)
#define AGP_MODE_GET_FW(x)		(((x) & 0x00000010U) >> 4)
#define AGP_MODE_GET_MODE_3(x)		(((x) & 0x00000008U) >> 3)
#define AGP_MODE_GET_RATE(x)		((x) & 0x00000007U)
#define AGP_MODE_SET_RQ(x,v)		(((x) & ~0xff000000U) | ((v) << 24))
#define AGP_MODE_SET_ARQSZ(x,v)		(((x) & ~0x0000e000U) | ((v) << 13))
#define AGP_MODE_SET_CAL(x,v)		(((x) & ~0x00001c00U) | ((v) << 10))
#define AGP_MODE_SET_SBA(x,v)		(((x) & ~0x00000200U) | ((v) << 9))
#define AGP_MODE_SET_AGP(x,v)		(((x) & ~0x00000100U) | ((v) << 8))
#define AGP_MODE_SET_GART_64(x,v)	(((x) & ~0x00000080U) | ((v) << 7))
#define AGP_MODE_SET_OVER_4G(x,v)	(((x) & ~0x00000020U) | ((v) << 5))
#define AGP_MODE_SET_FW(x,v)		(((x) & ~0x00000010U) | ((v) << 4))
#define AGP_MODE_SET_MODE_3(x,v)	(((x) & ~0x00000008U) | ((v) << 3))
#define AGP_MODE_SET_RATE(x,v)		(((x) & ~0x00000007U) | (v))
#define AGP_MODE_V2_RATE_1x		0x00000001
#define AGP_MODE_V2_RATE_2x		0x00000002
#define AGP_MODE_V2_RATE_4x		0x00000004
#define AGP_MODE_V3_RATE_4x		0x00000001
#define AGP_MODE_V3_RATE_8x		0x00000002
#define AGP_MODE_V3_RATE_RSVD		0x00000004

/* XXX: Compat */
#define AGP_MODE_GET_4G(x)		AGP_MODE_GET_OVER_4G(x)
#define AGP_MODE_SET_4G(x)		AGP_MODE_SET_OVER_4G(x)
#define AGP_MODE_RATE_1x		AGP_MODE_V2_RATE_1x
#define AGP_MODE_RATE_2x		AGP_MODE_V2_RATE_2x
#define AGP_MODE_RATE_4x		AGP_MODE_V2_RATE_4x

#define AGPIOC_BASE       'A'
#define AGPIOC_INFO       _IOR (AGPIOC_BASE, 0, agp_info)
#define AGPIOC_ACQUIRE    _IO  (AGPIOC_BASE, 1)
#define AGPIOC_RELEASE    _IO  (AGPIOC_BASE, 2)
#define AGPIOC_SETUP      _IOW (AGPIOC_BASE, 3, agp_setup)
#if 0
#define AGPIOC_RESERVE    _IOW (AGPIOC_BASE, 4, agp_region)
#define AGPIOC_PROTECT    _IOW (AGPIOC_BASE, 5, agp_region)
#endif
#define AGPIOC_ALLOCATE   _IOWR(AGPIOC_BASE, 6, agp_allocate)
#define AGPIOC_DEALLOCATE _IOW (AGPIOC_BASE, 7, int)
#define AGPIOC_BIND       _IOW (AGPIOC_BASE, 8, agp_bind)
#define AGPIOC_UNBIND     _IOW (AGPIOC_BASE, 9, agp_unbind)
#define AGPIOC_CHIPSET_FLUSH _IO (AGPIOC_BASE, 10)

typedef struct _agp_version {
	u_int16_t major;
	u_int16_t minor;
} agp_version;

typedef struct _agp_info {
	agp_version version;	/* version of the driver        */
	u_int32_t bridge_id;	/* bridge vendor/device         */
	u_int32_t agp_mode;	/* mode info of bridge          */
	off_t aper_base;	/* base of aperture             */
	size_t aper_size;	/* size of aperture             */
	size_t pg_total;	/* max pages (swap + system)    */
	size_t pg_system;	/* max pages (system)           */
	size_t pg_used;		/* current pages used           */
} agp_info;

typedef struct _agp_setup {
	u_int32_t agp_mode;		/* mode info of bridge          */
} agp_setup;

#if 0
/*
 * The "prot" down below needs still a "sleep" flag somehow ...
 */
typedef struct _agp_segment {
	off_t pg_start;		/* starting page to populate    */
	size_t pg_count;	/* number of pages              */
	int prot;		/* prot flags for mmap          */
} agp_segment;

typedef struct _agp_region {
	pid_t pid;		/* pid of process               */
	size_t seg_count;	/* number of segments           */
	struct _agp_segment *seg_list;
} agp_region;
#endif

typedef struct _agp_allocate {
	int key;		/* tag of allocation            */
	size_t pg_count;	/* number of pages              */
	u_int32_t type;		/* 0 == normal, other devspec   */
   	u_int32_t physical;     /* device specific (some devices  
				 * need a phys address of the     
				 * actual page behind the gatt    
				 * table)                        */
} agp_allocate;

typedef struct _agp_bind {
	int key;		/* tag of allocation            */
	off_t pg_start;		/* starting page to populate    */
} agp_bind;

typedef struct _agp_unbind {
	int key;		/* tag of allocation            */
	u_int32_t priority;	/* priority for paging out      */
} agp_unbind;

#endif /* !_SYS_AGPIO_H_ */