drivers/gpu/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
  34 #include "drmP.h"
  35
  36 # define ATI_PCIGART_PAGE_SIZE          4096    /**< PCI GART page size */
  37
  38 static int drm_ati_alloc_pcigart_table(struct drm_device *dev,
  39                                        struct drm_ati_pcigart_info *gart_info)
  40 {
  41         gart_info->table_handle = drm_pci_alloc(dev, gart_info->table_size,
  42                                                 PAGE_SIZE);
  43         if (gart_info->table_handle == NULL)
  44                 return -ENOMEM;
  45
  46         return 0;
  47 }
  48
  49 static void drm_ati_free_pcigart_table(struct drm_device *dev,
  50                                        struct drm_ati_pcigart_info *gart_info)
  51 {
  52         drm_pci_free(dev, gart_info->table_handle);
  53         gart_info->table_handle = NULL;
  54 }
  55
  56 int drm_ati_pcigart_cleanup(struct drm_device *dev, struct drm_ati_pcigart_info *gart_info)
  57 {
  58         struct drm_sg_mem *entry = dev->sg;
  59         unsigned long pages;
  60         int i;
  61         int max_pages;
  62
  63         /* we need to support large memory configurations */
  64         if (!entry) {
  65                 DRM_ERROR("no scatter/gather memory!\n");
  66                 return 0;
  67         }
  68
  69         if (gart_info->bus_addr) {
  70
  71                 max_pages = (gart_info->table_size / sizeof(u32));
  72                 pages = (entry->pages <= max_pages)
  73                   ? entry->pages : max_pages;
  74
  75                 for (i = 0; i < pages; i++) {
  76                         if (!entry->busaddr[i])
  77                                 break;
  78                         pci_unmap_page(dev->pdev, entry->busaddr[i],
  79                                          PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
  80                 }
  81
  82                 if (gart_info->gart_table_location == DRM_ATI_GART_MAIN)
  83                         gart_info->bus_addr = 0;
  84         }
  85
  86         if (gart_info->gart_table_location == DRM_ATI_GART_MAIN &&
  87             gart_info->table_handle) {
  88                 drm_ati_free_pcigart_table(dev, gart_info);
  89         }
  90
  91         return 1;
  92 }
  93 EXPORT_SYMBOL(drm_ati_pcigart_cleanup);
  94
  95 int drm_ati_pcigart_init(struct drm_device *dev, struct drm_ati_pcigart_info *gart_info)
  96 {
  97         struct drm_local_map *map = &gart_info->mapping;
  98         struct drm_sg_mem *entry = dev->sg;
  99         void *address = NULL;
 100         unsigned long pages;
 101         u32 *pci_gart = NULL, page_base, gart_idx;
 102         dma_addr_t bus_address = 0;
 103         int i, j, ret = 0;
 104         int max_ati_pages, max_real_pages;
 105
 106         if (!entry) {
 107                 DRM_ERROR("no scatter/gather memory!\n");
 108                 goto done;
 109         }
 110
 111         if (gart_info->gart_table_location == DRM_ATI_GART_MAIN) {
 112                 DRM_DEBUG("PCI: no table in VRAM: using normal RAM\n");
 113
 114                 if (pci_set_dma_mask(dev->pdev, gart_info->table_mask)) {
 115                         DRM_ERROR("fail to set dma mask to 0x%Lx\n",
 116                                   gart_info->table_mask);
 117                         ret = 1;
 118                         goto done;
 119                 }
 120
 121                 ret = drm_ati_alloc_pcigart_table(dev, gart_info);
 122                 if (ret) {
 123                         DRM_ERROR("cannot allocate PCI GART page!\n");
 124                         goto done;
 125                 }
 126
 127                 pci_gart = gart_info->table_handle->vaddr;
 128                 address = gart_info->table_handle->vaddr;
 129                 bus_address = gart_info->table_handle->busaddr;
 130         } else {
 131                 address = gart_info->addr;
 132                 bus_address = gart_info->bus_addr;
 133                 DRM_DEBUG("PCI: Gart Table: VRAM %08LX mapped at %08lX\n",
 134                           (unsigned long long)bus_address,
 135                           (unsigned long)address);
 136         }
 137
 138
 139         max_ati_pages = (gart_info->table_size / sizeof(u32));
 140         max_real_pages = max_ati_pages / (PAGE_SIZE / ATI_PCIGART_PAGE_SIZE);
 141         pages = (entry->pages <= max_real_pages)
 142             ? entry->pages : max_real_pages;
 143
 144         if (gart_info->gart_table_location == DRM_ATI_GART_MAIN) {
 145                 memset(pci_gart, 0, max_ati_pages * sizeof(u32));
 146         } else {
 147                 memset_io((void __iomem *)map->handle, 0, max_ati_pages * sizeof(u32));
 148         }
 149
 150         gart_idx = 0;
 151         for (i = 0; i < pages; i++) {
 152                 /* we need to support large memory configurations */
 153                 entry->busaddr[i] = pci_map_page(dev->pdev, entry->pagelist[i],
 154                                                  0, PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
 155                 if (entry->busaddr[i] == 0) {
 156                         DRM_ERROR("unable to map PCIGART pages!\n");
 157                         drm_ati_pcigart_cleanup(dev, gart_info);
 158                         address = NULL;
 159                         bus_address = 0;
 160                         goto done;
 161                 }
 162                 page_base = (u32) entry->busaddr[i];
 163
 164                 for (j = 0; j < (PAGE_SIZE / ATI_PCIGART_PAGE_SIZE); j++) {
 165                         u32 val;
 166
 167                         switch(gart_info->gart_reg_if) {
 168                         case DRM_ATI_GART_IGP:
 169                                 val = page_base | 0xc;
 170                                 break;
 171                         case DRM_ATI_GART_PCIE:
 172                                 val = (page_base >> 8) | 0xc;
 173                                 break;
 174                         default:
 175                         case DRM_ATI_GART_PCI:
 176                                 val = page_base;
 177                                 break;
 178                         }
 179                         if (gart_info->gart_table_location ==
 180                             DRM_ATI_GART_MAIN)
 181                                 pci_gart[gart_idx] = cpu_to_le32(val);
 182                         else
 183                                 DRM_WRITE32(map, gart_idx * sizeof(u32), val);
 184                         gart_idx++;
 185                         page_base += ATI_PCIGART_PAGE_SIZE;
 186                 }
 187         }
 188         ret = 1;
 189
 190 #if defined(__i386__) || defined(__x86_64__)
 191         wbinvd();
 192 #else
 193         mb();
 194 #endif
 195
 196       done:
 197         gart_info->addr = address;
 198         gart_info->bus_addr = bus_address;
 199         return ret;
 200 }
 201 EXPORT_SYMBOL(drm_ati_pcigart_init);