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drm_agp_netbsd.h revision 1.2.6.2 
      1 /*	$NetBSD: drm_agp_netbsd.h,v 1.2.6.2 2014/05/22 11:40:55 yamt 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/agpvar.h>
     45 
     46 #include <linux/kernel.h>
     47 #include <linux/pci.h>
     48 
     49 #define	__OS_HAS_AGP	1
     50 
     51 __CTASSERT(PAGE_SIZE == AGP_PAGE_SIZE);
     52 __CTASSERT(PAGE_SHIFT == AGP_PAGE_SHIFT);
     53 
     54 typedef struct agp_memory DRM_AGP_MEM;
     55 typedef struct agp_info DRM_AGP_KERN;
     56 
     57 struct agp_bridge_data {
     58 	struct agp_softc abd_sc; /* XXX Abstraction violation! */
     59 };
     60 
     61 /*
     62  * We already have a struct agp_memory, but fortunately it looks like
     63  * it may accidentally work out.
     64  */
     65 
     66 #if 0
     67 struct agp_memory {
     68 	void *am_cookie;
     69 };
     70 #endif
     71 
     72 static inline struct agp_bridge_data *
     73 agp_find_bridge(struct pci_dev *pdev __unused)
     74 {
     75 	/*
     76 	 * XXX How do we find the agp bridge attached to this
     77 	 * particular PCI device?
     78 	 */
     79 	return container_of((struct agp_softc *)agp_find_device(0),
     80 	    struct agp_bridge_data, abd_sc);
     81 }
     82 
     83 static inline struct agp_bridge_data *
     84 agp_backend_acquire(struct pci_dev *pdev)
     85 {
     86 	struct agp_bridge_data *const bridge = agp_find_bridge(pdev);
     87 
     88 	if (bridge == NULL)
     89 		return NULL;
     90 
     91 	/* XXX We lose the error code here.  */
     92 	if (agp_acquire(&bridge->abd_sc) != 0)
     93 		return NULL;
     94 
     95 	return bridge;
     96 }
     97 
     98 static inline void
     99 agp_backend_release(struct agp_bridge_data *bridge)
    100 {
    101 
    102 	/* XXX We lose the error code here.  */
    103 	(void)agp_release(&bridge->abd_sc);
    104 }
    105 
    106 /*
    107  * Happily, agp_enable will accidentally DTRT as is in NetBSD in spite
    108  * of the name collision, thanks to a curious `void *' argument in its
    109  * declaration...
    110  */
    111 
    112 #if 0
    113 static inline void
    114 agp_enable(struct agp_bridge_data *bridge)
    115 {
    116 	...
    117 }
    118 #endif
    119 
    120 static inline struct agp_memory *
    121 agp_allocate_memory(struct agp_bridge_data *bridge, size_t npages,
    122     uint32_t type)
    123 {
    124 	return agp_alloc_memory(&bridge->abd_sc, (npages << AGP_PAGE_SHIFT),
    125 	    type);
    126 }
    127 
    128 /*
    129  * Once again, a happy accident makes agp_free_memory work out.
    130  */
    131 
    132 #if 0
    133 static inline void
    134 agp_free_memory(struct agp_bridge_data *bridge, struct agp_memory *mem)
    135 {
    136 	...
    137 }
    138 #endif
    139 
    140 /*
    141  * Unfortunately, Linux's agp_bind_memory doesn't require the agp
    142  * device as an argument.  So we'll have to kludge that up as we go.
    143  */
    144 #if 0
    145 static inline void
    146 agp_bind_memory(struct agp_memory *mem, size_t npages)
    147 {
    148 	agp_bind_memory(???, mem, (npages << AGP_PAGE_SHIFT));
    149 }
    150 #endif
    151 
    152 static inline void
    153 agp_copy_info(struct agp_bridge_data *bridge, DRM_AGP_KERN *info)
    154 {
    155 	agp_get_info(bridge, info);
    156 }
    157 
    158 static inline int
    159 drm_bind_agp(struct agp_bridge_data *bridge, DRM_AGP_MEM *mem, size_t page)
    160 {
    161 	return agp_bind_memory(&bridge->abd_sc, mem, (page << AGP_PAGE_SHIFT));
    162 }
    163 
    164 static inline int
    165 drm_unbind_agp(struct agp_bridge_data *bridge, DRM_AGP_MEM *mem)
    166 {
    167 	return agp_unbind_memory(&bridge->abd_sc, mem);
    168 }
    169 
    170 static inline void
    171 drm_free_agp(struct agp_bridge_data *bridge, DRM_AGP_MEM *mem,
    172     size_t npages __unused)
    173 {
    174 	agp_free_memory(&bridge->abd_sc, mem);
    175 }
    176 
    177 #endif  /* _DRM_DRM_AGP_NETBSD_H_ */
    178