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      1 /*	$NetBSD: drm_agp_netbsd.h,v 1.8 2018/08/28 03:41:39 riastradh Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2013 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Taylor R. Campbell.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #ifndef _DRM_DRM_AGP_NETBSD_H_
     33 #define _DRM_DRM_AGP_NETBSD_H_
     34 
     35 /*
     36  * XXX XXX XXX BEWARE!  This file is full of abstraction violations
     37  * that are ruthlessly exploited for their value as happy accidents!
     38  * You have been warned!
     39  */
     40 
     41 #include <sys/agpio.h>
     42 
     43 #include <dev/pci/pcivar.h>	/* XXX include order botch */
     44 #include <dev/pci/agpreg.h>
     45 #include <dev/pci/agpvar.h>
     46 
     47 #include <linux/kernel.h>
     48 #include <linux/pci.h>
     49 
     50 #define	PCI_AGP_COMMAND_FW	AGPCMD_FWEN
     51 
     52 #define	CONFIG_AGP	1
     53 
     54 struct agp_kern_info {
     55 	struct agp_info aki_info;
     56 };
     57 
     58 struct agp_bridge_data {
     59 	struct agp_softc abd_sc; /* XXX Abstraction violation! */
     60 };
     61 
     62 /*
     63  * We already have a struct agp_memory, but fortunately it looks like
     64  * it may accidentally work out.
     65  */
     66 
     67 #if 0
     68 struct agp_memory {
     69 	void *am_cookie;
     70 };
     71 #endif
     72 
     73 static inline struct agp_bridge_data *
     74 agp_find_bridge(struct pci_dev *pdev __unused)
     75 {
     76 	/*
     77 	 * XXX How do we find the agp bridge attached to this
     78 	 * particular PCI device?
     79 	 */
     80 	return container_of((struct agp_softc *)agp_find_device(0),
     81 	    struct agp_bridge_data, abd_sc);
     82 }
     83 
     84 static inline struct agp_bridge_data *
     85 agp_backend_acquire(struct pci_dev *pdev)
     86 {
     87 	struct agp_bridge_data *const bridge = agp_find_bridge(pdev);
     88 
     89 	if (bridge == NULL)
     90 		return NULL;
     91 
     92 	/* XXX We lose the error code here.  */
     93 	if (agp_acquire(&bridge->abd_sc) != 0)
     94 		return NULL;
     95 
     96 	return bridge;
     97 }
     98 
     99 static inline void
    100 agp_backend_release(struct agp_bridge_data *bridge)
    101 {
    102 
    103 	/* XXX We lose the error code here.  */
    104 	(void)agp_release(&bridge->abd_sc);
    105 }
    106 
    107 /*
    108  * Happily, agp_enable will accidentally DTRT as is in NetBSD in spite
    109  * of the name collision, thanks to a curious `void *' argument in its
    110  * declaration...
    111  */
    112 
    113 #if 0
    114 static inline void
    115 agp_enable(struct agp_bridge_data *bridge)
    116 {
    117 	...
    118 }
    119 #endif
    120 
    121 static inline struct agp_memory *
    122 agp_allocate_memory(struct agp_bridge_data *bridge, size_t npages,
    123     uint32_t type)
    124 {
    125 	return agp_alloc_memory(&bridge->abd_sc, (npages << AGP_PAGE_SHIFT),
    126 	    type);
    127 }
    128 
    129 /*
    130  * Once again, a happy accident makes agp_free_memory work out.
    131  */
    132 
    133 #if 0
    134 static inline void
    135 agp_free_memory(struct agp_bridge_data *bridge, struct agp_memory *mem)
    136 {
    137 	...
    138 }
    139 #endif
    140 
    141 /*
    142  * Unfortunately, Linux's agp_bind_memory doesn't require the agp
    143  * device as an argument.  So we'll have to kludge that up as we go.
    144  */
    145 #if 0
    146 static inline void
    147 agp_bind_memory(struct agp_memory *mem, size_t npages)
    148 {
    149 	agp_bind_memory(???, mem, (npages << AGP_PAGE_SHIFT));
    150 }
    151 #endif
    152 
    153 static inline void
    154 agp_copy_info(struct agp_bridge_data *bridge, struct agp_kern_info *info)
    155 {
    156 	agp_get_info(bridge, &info->aki_info);
    157 }
    158 
    159 static inline int
    160 drm_bind_agp(struct agp_bridge_data *bridge, struct agp_memory *mem,
    161     unsigned npages)
    162 {
    163 	return agp_bind_memory(&bridge->abd_sc, mem,
    164 	    ((size_t)npages << AGP_PAGE_SHIFT));
    165 }
    166 
    167 static inline int
    168 drm_unbind_agp(struct agp_bridge_data *bridge, struct agp_memory *mem)
    169 {
    170 	return agp_unbind_memory(&bridge->abd_sc, mem);
    171 }
    172 
    173 static inline void
    174 drm_free_agp(struct agp_bridge_data *bridge, struct agp_memory *mem,
    175     int npages __unused)
    176 {
    177 	agp_free_memory(&bridge->abd_sc, mem);
    178 }
    179 
    180 #endif  /* _DRM_DRM_AGP_NETBSD_H_ */
    181