Merge branches 'hammer2' and 'master' of ssh://crater.dragonflybsd.org/repository...
[dragonfly.git] / sys / dev / drm / ati_pcigart.c
1 /*-
2  * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
3  * All Rights Reserved.
4  *
5  * Permission is hereby granted, free of charge, to any person obtaining a
6  * copy of this software and associated documentation files (the "Software"),
7  * to deal in the Software without restriction, including without limitation
8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9  * and/or sell copies of the Software, and to permit persons to whom the
10  * Software is furnished to do so, subject to the following conditions:
11  *
12  * The above copyright notice and this permission notice (including the next
13  * paragraph) shall be included in all copies or substantial portions of the
14  * Software.
15  *
16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
19  * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
22  * DEALINGS IN THE SOFTWARE.
23  *
24  * Authors:
25  *   Gareth Hughes <gareth@valinux.com>
26  *
27  */
28
29 /** @file ati_pcigart.c
30  * Implementation of ATI's PCIGART, which provides an aperture in card virtual
31  * address space with addresses remapped to system memory.
32  */
33
34 #include "dev/drm/drmP.h"
35
36 #define ATI_PCIGART_PAGE_SIZE           4096    /* PCI GART page size */
37 #define ATI_PCIGART_PAGE_MASK           (~(ATI_PCIGART_PAGE_SIZE-1))
38
39 #define ATI_PCIE_WRITE 0x4
40 #define ATI_PCIE_READ 0x8
41
42 static void
43 drm_ati_alloc_pcigart_table_cb(void *arg, bus_dma_segment_t *segs,
44                                int nsegs, int error)
45 {
46         struct drm_dma_handle *dmah = arg;
47
48         if (error != 0)
49                 return;
50
51         KASSERT(nsegs == 1,
52             ("drm_ati_alloc_pcigart_table_cb: bad dma segment count"));
53
54         dmah->busaddr = segs[0].ds_addr;
55 }
56
57 static int
58 drm_ati_alloc_pcigart_table(struct drm_device *dev,
59                             struct drm_ati_pcigart_info *gart_info)
60 {
61         struct drm_dma_handle *dmah;
62         int flags, ret;
63
64         dmah = malloc(sizeof(struct drm_dma_handle), DRM_MEM_DMA,
65             M_ZERO | M_NOWAIT);
66         if (dmah == NULL)
67                 return ENOMEM;
68
69         DRM_UNLOCK();
70         ret = bus_dma_tag_create(NULL, PAGE_SIZE, 0, /* tag, align, boundary */
71             gart_info->table_mask, BUS_SPACE_MAXADDR, /* lowaddr, highaddr */
72             NULL, NULL, /* filtfunc, filtfuncargs */
73             gart_info->table_size, 1, /* maxsize, nsegs */
74             gart_info->table_size, /* maxsegsize */
75             0, /* flags */
76             &dmah->tag);
77         if (ret != 0) {
78                 free(dmah, DRM_MEM_DMA);
79                 return ENOMEM;
80         }
81
82         flags = BUS_DMA_WAITOK | BUS_DMA_ZERO;
83
84 #if 0
85         if (gart_info->gart_reg_if == DRM_ATI_GART_IGP)
86             flags |= BUS_DMA_NOCACHE;
87 #endif
88         
89         ret = bus_dmamem_alloc(dmah->tag, &dmah->vaddr, flags, &dmah->map);
90         if (ret != 0) {
91                 bus_dma_tag_destroy(dmah->tag);
92                 free(dmah, DRM_MEM_DMA);
93                 return ENOMEM;
94         }
95         DRM_LOCK();
96
97         ret = bus_dmamap_load(dmah->tag, dmah->map, dmah->vaddr,
98             gart_info->table_size, drm_ati_alloc_pcigart_table_cb, dmah,
99             BUS_DMA_NOWAIT);
100         if (ret != 0) {
101                 bus_dmamem_free(dmah->tag, dmah->vaddr, dmah->map);
102                 bus_dma_tag_destroy(dmah->tag);
103                 free(dmah, DRM_MEM_DMA);
104                 return ENOMEM;
105         }
106
107         gart_info->dmah = dmah;
108
109         return 0;
110 }
111
112 static void
113 drm_ati_free_pcigart_table(struct drm_device *dev,
114                            struct drm_ati_pcigart_info *gart_info)
115 {
116         struct drm_dma_handle *dmah = gart_info->dmah;
117
118         bus_dmamem_free(dmah->tag, dmah->vaddr, dmah->map);
119         bus_dma_tag_destroy(dmah->tag);
120         free(dmah, DRM_MEM_DMA);
121         gart_info->dmah = NULL;
122 }
123
124 int
125 drm_ati_pcigart_cleanup(struct drm_device *dev,
126                         struct drm_ati_pcigart_info *gart_info)
127 {
128         /* we need to support large memory configurations */
129         if (dev->sg == NULL) {
130                 DRM_ERROR("no scatter/gather memory!\n");
131                 return 0;
132         }
133
134         if (gart_info->bus_addr) {
135                 if (gart_info->gart_table_location == DRM_ATI_GART_MAIN) {
136                         gart_info->bus_addr = 0;
137                         if (gart_info->dmah)
138                                 drm_ati_free_pcigart_table(dev, gart_info);
139                 }
140         }
141
142         return 1;
143 }
144
145 int
146 drm_ati_pcigart_init(struct drm_device *dev,
147                      struct drm_ati_pcigart_info *gart_info)
148 {
149         void *address = NULL;
150         unsigned long pages;
151         u32 *pci_gart, page_base;
152         dma_addr_t bus_address = 0;
153         dma_addr_t entry_addr;
154         int i, j, ret = 0;
155         int max_pages;
156
157         /* we need to support large memory configurations */
158         if (dev->sg == NULL) {
159                 DRM_ERROR("no scatter/gather memory!\n");
160                 goto done;
161         }
162
163         if (gart_info->gart_table_location == DRM_ATI_GART_MAIN) {
164                 DRM_DEBUG("PCI: no table in VRAM: using normal RAM\n");
165
166                 ret = drm_ati_alloc_pcigart_table(dev, gart_info);
167                 if (ret) {
168                         DRM_ERROR("cannot allocate PCI GART page!\n");
169                         goto done;
170                 }
171
172                 address = (void *)gart_info->dmah->vaddr;
173                 bus_address = gart_info->dmah->busaddr;
174         } else {
175                 address = gart_info->addr;
176                 bus_address = gart_info->bus_addr;
177                 DRM_DEBUG("PCI: Gart Table: VRAM %08X mapped at %08lX\n",
178                           (unsigned int)bus_address, (unsigned long)address);
179         }
180
181         pci_gart = (u32 *) address;
182
183         max_pages = (gart_info->table_size / sizeof(u32));
184         pages = (dev->sg->pages <= max_pages)
185             ? dev->sg->pages : max_pages;
186
187         memset(pci_gart, 0, max_pages * sizeof(u32));
188
189         KASSERT(PAGE_SIZE >= ATI_PCIGART_PAGE_SIZE, ("page size too small"));
190
191         for (i = 0; i < pages; i++) {
192                 entry_addr = dev->sg->busaddr[i];
193                 for (j = 0; j < (PAGE_SIZE / ATI_PCIGART_PAGE_SIZE); j++) {
194                         page_base = (u32) entry_addr & ATI_PCIGART_PAGE_MASK;
195                         switch(gart_info->gart_reg_if) {
196                         case DRM_ATI_GART_IGP:
197                                 page_base |=
198                                     (upper_32_bits(entry_addr) & 0xff) << 4;
199                                 page_base |= 0xc;
200                                 break;
201                         case DRM_ATI_GART_PCIE:
202                                 page_base >>= 8;
203                                 page_base |=
204                                     (upper_32_bits(entry_addr) & 0xff) << 24;
205                                 page_base |= ATI_PCIE_READ | ATI_PCIE_WRITE;
206                                 break;
207                         default:
208                         case DRM_ATI_GART_PCI:
209                                 break;
210                         }
211                         *pci_gart = cpu_to_le32(page_base);
212                         pci_gart++;
213                         entry_addr += ATI_PCIGART_PAGE_SIZE;
214                 }
215         }
216
217         ret = 1;
218
219     done:
220         gart_info->addr = address;
221         gart_info->bus_addr = bus_address;
222         return ret;
223 }