drm/radeon/kms/atom: AdjustPixelClock fixes for DP bridges
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / gpu / drm / drm_memory.c
blobc9b805000a11e827c1677c0d81ccb33c5be1442c
1 /**
2 * \file drm_memory.c
3 * Memory management wrappers for DRM
5 * \author Rickard E. (Rik) Faith <faith@valinux.com>
6 * \author Gareth Hughes <gareth@valinux.com>
7 */
9 /*
10 * Created: Thu Feb 4 14:00:34 1999 by faith@valinux.com
12 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
13 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
14 * All Rights Reserved.
16 * Permission is hereby granted, free of charge, to any person obtaining a
17 * copy of this software and associated documentation files (the "Software"),
18 * to deal in the Software without restriction, including without limitation
19 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
20 * and/or sell copies of the Software, and to permit persons to whom the
21 * Software is furnished to do so, subject to the following conditions:
23 * The above copyright notice and this permission notice (including the next
24 * paragraph) shall be included in all copies or substantial portions of the
25 * Software.
27 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
28 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
29 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
30 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
31 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
32 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
33 * OTHER DEALINGS IN THE SOFTWARE.
36 #include <linux/highmem.h>
37 #include "drmP.h"
39 /**
40 * Called when "/proc/dri/%dev%/mem" is read.
42 * \param buf output buffer.
43 * \param start start of output data.
44 * \param offset requested start offset.
45 * \param len requested number of bytes.
46 * \param eof whether there is no more data to return.
47 * \param data private data.
48 * \return number of written bytes.
50 * No-op.
52 int drm_mem_info(char *buf, char **start, off_t offset,
53 int len, int *eof, void *data)
55 return 0;
58 #if __OS_HAS_AGP
59 static void *agp_remap(unsigned long offset, unsigned long size,
60 struct drm_device * dev)
62 unsigned long i, num_pages =
63 PAGE_ALIGN(size) / PAGE_SIZE;
64 struct drm_agp_mem *agpmem;
65 struct page **page_map;
66 struct page **phys_page_map;
67 void *addr;
69 size = PAGE_ALIGN(size);
71 #ifdef __alpha__
72 offset -= dev->hose->mem_space->start;
73 #endif
75 list_for_each_entry(agpmem, &dev->agp->memory, head)
76 if (agpmem->bound <= offset
77 && (agpmem->bound + (agpmem->pages << PAGE_SHIFT)) >=
78 (offset + size))
79 break;
80 if (&agpmem->head == &dev->agp->memory)
81 return NULL;
84 * OK, we're mapping AGP space on a chipset/platform on which memory accesses by
85 * the CPU do not get remapped by the GART. We fix this by using the kernel's
86 * page-table instead (that's probably faster anyhow...).
88 /* note: use vmalloc() because num_pages could be large... */
89 page_map = vmalloc(num_pages * sizeof(struct page *));
90 if (!page_map)
91 return NULL;
93 phys_page_map = (agpmem->memory->pages + (offset - agpmem->bound) / PAGE_SIZE);
94 for (i = 0; i < num_pages; ++i)
95 page_map[i] = phys_page_map[i];
96 addr = vmap(page_map, num_pages, VM_IOREMAP, PAGE_AGP);
97 vfree(page_map);
99 return addr;
102 /** Wrapper around agp_free_memory() */
103 void drm_free_agp(DRM_AGP_MEM * handle, int pages)
105 agp_free_memory(handle);
107 EXPORT_SYMBOL(drm_free_agp);
109 /** Wrapper around agp_bind_memory() */
110 int drm_bind_agp(DRM_AGP_MEM * handle, unsigned int start)
112 return agp_bind_memory(handle, start);
115 /** Wrapper around agp_unbind_memory() */
116 int drm_unbind_agp(DRM_AGP_MEM * handle)
118 return agp_unbind_memory(handle);
120 EXPORT_SYMBOL(drm_unbind_agp);
122 #else /* __OS_HAS_AGP */
123 static inline void *agp_remap(unsigned long offset, unsigned long size,
124 struct drm_device * dev)
126 return NULL;
129 #endif /* agp */
131 void drm_core_ioremap(struct drm_local_map *map, struct drm_device *dev)
133 if (drm_core_has_AGP(dev) &&
134 dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP)
135 map->handle = agp_remap(map->offset, map->size, dev);
136 else
137 map->handle = ioremap(map->offset, map->size);
139 EXPORT_SYMBOL(drm_core_ioremap);
141 void drm_core_ioremap_wc(struct drm_local_map *map, struct drm_device *dev)
143 if (drm_core_has_AGP(dev) &&
144 dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP)
145 map->handle = agp_remap(map->offset, map->size, dev);
146 else
147 map->handle = ioremap_wc(map->offset, map->size);
149 EXPORT_SYMBOL(drm_core_ioremap_wc);
151 void drm_core_ioremapfree(struct drm_local_map *map, struct drm_device *dev)
153 if (!map->handle || !map->size)
154 return;
156 if (drm_core_has_AGP(dev) &&
157 dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP)
158 vunmap(map->handle);
159 else
160 iounmap(map->handle);
162 EXPORT_SYMBOL(drm_core_ioremapfree);