sys/dev/drm/ati_pcigart.c

   1 /**
   2  * \file ati_pcigart.c
   3  * ATI PCI GART support
   4  *
   5  * \author Gareth Hughes <gareth@valinux.com>
   6  */
   7
   8 /*
   9  * Created: Wed Dec 13 21:52:19 2000 by gareth@valinux.com
  10  *
  11  * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
  12  * All Rights Reserved.
  13  *
  14  * Permission is hereby granted, free of charge, to any person obtaining a
  15  * copy of this software and associated documentation files (the "Software"),
  16  * to deal in the Software without restriction, including without limitation
  17  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  18  * and/or sell copies of the Software, and to permit persons to whom the
  19  * Software is furnished to do so, subject to the following conditions:
  20  *
  21  * The above copyright notice and this permission notice (including the next
  22  * paragraph) shall be included in all copies or substantial portions of the
  23  * Software.
  24  *
  25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  26  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  27  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  28  * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  29  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  30  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  31  * DEALINGS IN THE SOFTWARE.
  32  *
  33  * $FreeBSD: head/sys/dev/drm2/ati_pcigart.c 254885 2013-08-25 19:37:15Z dumbbell $
  34  */
  35
  36 #include <drm/drmP.h>
  37
  38 #include <drm/ati_pcigart.h>
  39
  40 #define ATI_PCIGART_PAGE_SIZE           4096    /**< PCI GART page size */
  41
  42 static int drm_ati_alloc_pcigart_table(struct drm_device *dev,
  43                                        struct drm_ati_pcigart_info *gart_info)
  44 {
  45         gart_info->table_handle = drm_pci_alloc(dev, gart_info->table_size,
  46                                                 PAGE_SIZE);
  47         if (gart_info->table_handle == NULL)
  48                 return -ENOMEM;
  49
  50         return 0;
  51 }
  52
  53 static void drm_ati_free_pcigart_table(struct drm_device *dev,
  54                                        struct drm_ati_pcigart_info *gart_info)
  55 {
  56         drm_pci_free(dev, gart_info->table_handle);
  57         gart_info->table_handle = NULL;
  58 }
  59
  60 int drm_ati_pcigart_cleanup(struct drm_device *dev, struct drm_ati_pcigart_info *gart_info)
  61 {
  62         struct drm_sg_mem *entry = dev->sg;
  63 #ifdef __linux__
  64         unsigned long pages;
  65         int i;
  66         int max_pages;
  67 #endif
  68
  69         /* we need to support large memory configurations */
  70         if (!entry) {
  71                 DRM_ERROR("no scatter/gather memory!\n");
  72                 return 0;
  73         }
  74
  75         if (gart_info->bus_addr) {
  76 #ifdef __linux__
  77
  78                 max_pages = (gart_info->table_size / sizeof(u32));
  79                 pages = (entry->pages <= max_pages)
  80                   ? entry->pages : max_pages;
  81
  82                 for (i = 0; i < pages; i++) {
  83                         if (!entry->busaddr[i])
  84                                 break;
  85                         pci_unmap_page(dev->pdev, entry->busaddr[i],
  86                                          PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
  87                 }
  88 #endif
  89
  90                 if (gart_info->gart_table_location == DRM_ATI_GART_MAIN)
  91                         gart_info->bus_addr = 0;
  92         }
  93
  94         if (gart_info->gart_table_location == DRM_ATI_GART_MAIN &&
  95             gart_info->table_handle) {
  96                 drm_ati_free_pcigart_table(dev, gart_info);
  97         }
  98
  99         return 1;
 100 }
 101
 102 int drm_ati_pcigart_init(struct drm_device *dev, struct drm_ati_pcigart_info *gart_info)
 103 {
 104         struct drm_local_map *map = &gart_info->mapping;
 105         struct drm_sg_mem *entry = dev->sg;
 106         void *address = NULL;
 107         unsigned long pages;
 108         u32 *pci_gart = NULL, page_base, gart_idx;
 109         dma_addr_t bus_address = 0;
 110         int i, j, ret = 0;
 111         int max_ati_pages, max_real_pages;
 112
 113         if (!entry) {
 114                 DRM_ERROR("no scatter/gather memory!\n");
 115                 goto done;
 116         }
 117
 118         if (gart_info->gart_table_location == DRM_ATI_GART_MAIN) {
 119                 DRM_DEBUG("PCI: no table in VRAM: using normal RAM\n");
 120
 121 #ifdef __linux__
 122                 if (pci_set_dma_mask(dev->pdev, gart_info->table_mask)) {
 123                         DRM_ERROR("fail to set dma mask to 0x%Lx\n",
 124                                   (unsigned long long)gart_info->table_mask);
 125                         ret = 1;
 126                         goto done;
 127                 }
 128 #endif
 129
 130                 ret = drm_ati_alloc_pcigart_table(dev, gart_info);
 131                 if (ret) {
 132                         DRM_ERROR("cannot allocate PCI GART page!\n");
 133                         goto done;
 134                 }
 135
 136                 pci_gart = gart_info->table_handle->vaddr;
 137                 address = gart_info->table_handle->vaddr;
 138                 bus_address = gart_info->table_handle->busaddr;
 139         } else {
 140                 address = gart_info->addr;
 141                 bus_address = gart_info->bus_addr;
 142                 DRM_DEBUG("PCI: Gart Table: VRAM %08LX mapped at %08lX\n",
 143                           (unsigned long long)bus_address,
 144                           (unsigned long)address);
 145         }
 146
 147
 148         max_ati_pages = (gart_info->table_size / sizeof(u32));
 149         max_real_pages = max_ati_pages / (PAGE_SIZE / ATI_PCIGART_PAGE_SIZE);
 150         pages = (entry->pages <= max_real_pages)
 151             ? entry->pages : max_real_pages;
 152
 153         if (gart_info->gart_table_location == DRM_ATI_GART_MAIN) {
 154                 memset(pci_gart, 0, max_ati_pages * sizeof(u32));
 155         } else {
 156                 memset_io((void __iomem *)map->handle, 0, max_ati_pages * sizeof(u32));
 157         }
 158
 159         gart_idx = 0;
 160         for (i = 0; i < pages; i++) {
 161 #ifdef __linux__
 162                 /* we need to support large memory configurations */
 163                 entry->busaddr[i] = pci_map_page(dev->pdev, entry->pagelist[i],
 164                                                  0, PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
 165                 if (pci_dma_mapping_error(dev->pdev, entry->busaddr[i])) {
 166                         DRM_ERROR("unable to map PCIGART pages!\n");
 167                         drm_ati_pcigart_cleanup(dev, gart_info);
 168                         address = NULL;
 169                         bus_address = 0;
 170                         goto done;
 171                 }
 172 #endif
 173                 page_base = (u32) entry->busaddr[i];
 174
 175                 for (j = 0; j < (PAGE_SIZE / ATI_PCIGART_PAGE_SIZE); j++) {
 176                         u32 val;
 177
 178                         switch(gart_info->gart_reg_if) {
 179                         case DRM_ATI_GART_IGP:
 180                                 val = page_base | 0xc;
 181                                 break;
 182                         case DRM_ATI_GART_PCIE:
 183                                 val = (page_base >> 8) | 0xc;
 184                                 break;
 185                         default:
 186                         case DRM_ATI_GART_PCI:
 187                                 val = page_base;
 188                                 break;
 189                         }
 190                         if (gart_info->gart_table_location ==
 191                             DRM_ATI_GART_MAIN)
 192                                 pci_gart[gart_idx] = cpu_to_le32(val);
 193                         else
 194                                 DRM_WRITE32(map, gart_idx * sizeof(u32), val);
 195                         gart_idx++;
 196                         page_base += ATI_PCIGART_PAGE_SIZE;
 197                 }
 198         }
 199         ret = 1;
 200
 201         wbinvd();
 202
 203       done:
 204         gart_info->addr = address;
 205         gart_info->bus_addr = bus_address;
 206         return ret;
 207 }