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 <linux/export.h>
  35
  36 #include <drm/ati_pcigart.h>
  37 #include <drm/drm_device.h>
  38 #include <drm/drm_pci.h>
  39 #include <drm/drm_print.h>
  40
  41 # define ATI_PCIGART_PAGE_SIZE          4096    /**< PCI GART page size */
  42
  43 static int drm_ati_alloc_pcigart_table(struct drm_device *dev,
  44                                        struct drm_ati_pcigart_info *gart_info)
  45 {
  46         gart_info->table_handle = drm_pci_alloc(dev, gart_info->table_size,
  47                                                 PAGE_SIZE);
  48         if (gart_info->table_handle == NULL)
  49                 return -ENOMEM;
  50
  51         return 0;
  52 }
  53
  54 static void drm_ati_free_pcigart_table(struct drm_device *dev,
  55                                        struct drm_ati_pcigart_info *gart_info)
  56 {
  57         drm_pci_free(dev, gart_info->table_handle);
  58         gart_info->table_handle = NULL;
  59 }
  60
  61 int drm_ati_pcigart_cleanup(struct drm_device *dev, struct drm_ati_pcigart_info *gart_info)
  62 {
  63         struct drm_sg_mem *entry = dev->sg;
  64         unsigned long pages;
  65         int i;
  66         int max_pages;
  67
  68         /* we need to support large memory configurations */
  69         if (!entry) {
  70                 DRM_ERROR("no scatter/gather memory!\n");
  71                 return 0;
  72         }
  73
  74         if (gart_info->bus_addr) {
  75
  76                 max_pages = (gart_info->table_size / sizeof(u32));
  77                 pages = (entry->pages <= max_pages)
  78                   ? entry->pages : max_pages;
  79
  80                 for (i = 0; i < pages; i++) {
  81                         if (!entry->busaddr[i])
  82                                 break;
  83                         pci_unmap_page(dev->pdev, entry->busaddr[i],
  84                                          PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
  85                 }
  86
  87                 if (gart_info->gart_table_location == DRM_ATI_GART_MAIN)
  88                         gart_info->bus_addr = 0;
  89         }
  90
  91         if (gart_info->gart_table_location == DRM_ATI_GART_MAIN &&
  92             gart_info->table_handle) {
  93                 drm_ati_free_pcigart_table(dev, gart_info);
  94         }
  95
  96         return 1;
  97 }
  98 EXPORT_SYMBOL(drm_ati_pcigart_cleanup);
  99
 100 int drm_ati_pcigart_init(struct drm_device *dev, struct drm_ati_pcigart_info *gart_info)
 101 {
 102         struct drm_local_map *map = &gart_info->mapping;
 103         struct drm_sg_mem *entry = dev->sg;
 104         void *address = NULL;
 105         unsigned long pages;
 106         u32 *pci_gart = NULL, page_base, gart_idx;
 107         dma_addr_t bus_address = 0;
 108         int i, j, ret = -ENOMEM;
 109         int max_ati_pages, max_real_pages;
 110
 111         if (!entry) {
 112                 DRM_ERROR("no scatter/gather memory!\n");
 113                 goto done;
 114         }
 115
 116         if (gart_info->gart_table_location == DRM_ATI_GART_MAIN) {
 117                 DRM_DEBUG("PCI: no table in VRAM: using normal RAM\n");
 118
 119                 if (pci_set_dma_mask(dev->pdev, gart_info->table_mask)) {
 120                         DRM_ERROR("fail to set dma mask to 0x%Lx\n",
 121                                   (unsigned long long)gart_info->table_mask);
 122                         ret = -EFAULT;
 123                         goto done;
 124                 }
 125
 126                 ret = drm_ati_alloc_pcigart_table(dev, gart_info);
 127                 if (ret) {
 128                         DRM_ERROR("cannot allocate PCI GART page!\n");
 129                         goto done;
 130                 }
 131
 132                 pci_gart = gart_info->table_handle->vaddr;
 133                 address = gart_info->table_handle->vaddr;
 134                 bus_address = gart_info->table_handle->busaddr;
 135         } else {
 136                 address = gart_info->addr;
 137                 bus_address = gart_info->bus_addr;
 138                 DRM_DEBUG("PCI: Gart Table: VRAM %08LX mapped at %08lX\n",
 139                           (unsigned long long)bus_address,
 140                           (unsigned long)address);
 141         }
 142
 143
 144         max_ati_pages = (gart_info->table_size / sizeof(u32));
 145         max_real_pages = max_ati_pages / (PAGE_SIZE / ATI_PCIGART_PAGE_SIZE);
 146         pages = (entry->pages <= max_real_pages)
 147             ? entry->pages : max_real_pages;
 148
 149         if (gart_info->gart_table_location == DRM_ATI_GART_MAIN) {
 150                 memset(pci_gart, 0, max_ati_pages * sizeof(u32));
 151         } else {
 152                 memset_io((void __iomem *)map->handle, 0, max_ati_pages * sizeof(u32));
 153         }
 154
 155         gart_idx = 0;
 156         for (i = 0; i < pages; i++) {
 157                 /* we need to support large memory configurations */
 158                 entry->busaddr[i] = pci_map_page(dev->pdev, entry->pagelist[i],
 159                                                  0, PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
 160                 if (pci_dma_mapping_error(dev->pdev, entry->busaddr[i])) {
 161                         DRM_ERROR("unable to map PCIGART pages!\n");
 162                         drm_ati_pcigart_cleanup(dev, gart_info);
 163                         address = NULL;
 164                         bus_address = 0;
 165                         ret = -ENOMEM;
 166                         goto done;
 167                 }
 168                 page_base = (u32) entry->busaddr[i];
 169
 170                 for (j = 0; j < (PAGE_SIZE / ATI_PCIGART_PAGE_SIZE); j++) {
 171                         u32 offset;
 172                         u32 val;
 173
 174                         switch(gart_info->gart_reg_if) {
 175                         case DRM_ATI_GART_IGP:
 176                                 val = page_base | 0xc;
 177                                 break;
 178                         case DRM_ATI_GART_PCIE:
 179                                 val = (page_base >> 8) | 0xc;
 180                                 break;
 181                         default:
 182                         case DRM_ATI_GART_PCI:
 183                                 val = page_base;
 184                                 break;
 185                         }
 186                         if (gart_info->gart_table_location ==
 187                             DRM_ATI_GART_MAIN) {
 188                                 pci_gart[gart_idx] = cpu_to_le32(val);
 189                         } else {
 190                                 offset = gart_idx * sizeof(u32);
 191                                 writel(val, (void __iomem *)map->handle + offset);
 192                         }
 193                         gart_idx++;
 194                         page_base += ATI_PCIGART_PAGE_SIZE;
 195                 }
 196         }
 197         ret = 0;
 198
 199 #if defined(__i386__) || defined(__x86_64__)
 200         wbinvd();
 201 #else
 202         mb();
 203 #endif
 204
 205       done:
 206         gart_info->addr = address;
 207         gart_info->bus_addr = bus_address;
 208         return ret;
 209 }
 210 EXPORT_SYMBOL(drm_ati_pcigart_init);