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 #define ATI_PCIGART_PAGE_SIZE           4096    /**< PCI GART page size */
  39
  40 static int drm_ati_alloc_pcigart_table(struct drm_device *dev,
  41                                        struct drm_ati_pcigart_info *gart_info)
  42 {
  43         gart_info->table_handle = drm_pci_alloc(dev, gart_info->table_size,
  44                                                 PAGE_SIZE, 0xFFFFFFFFUL);
  45         if (gart_info->table_handle == NULL)
  46                 return -ENOMEM;
  47
  48         return 0;
  49 }
  50
  51 static void drm_ati_free_pcigart_table(struct drm_device *dev,
  52                                        struct drm_ati_pcigart_info *gart_info)
  53 {
  54         drm_pci_free(dev, gart_info->table_handle);
  55         gart_info->table_handle = NULL;
  56 }
  57
  58 int drm_ati_pcigart_cleanup(struct drm_device *dev, struct drm_ati_pcigart_info *gart_info)
  59 {
  60         struct drm_sg_mem *entry = dev->sg;
  61 #ifdef __linux__
  62         unsigned long pages;
  63         int i;
  64         int max_pages;
  65 #endif
  66
  67         /* we need to support large memory configurations */
  68         if (!entry) {
  69                 DRM_ERROR("no scatter/gather memory!\n");
  70                 return 0;
  71         }
  72
  73         if (gart_info->bus_addr) {
  74 #ifdef __linux__
  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 #endif
  87
  88                 if (gart_info->gart_table_location == DRM_ATI_GART_MAIN)
  89                         gart_info->bus_addr = 0;
  90         }
  91
  92         if (gart_info->gart_table_location == DRM_ATI_GART_MAIN &&
  93             gart_info->table_handle) {
  94                 drm_ati_free_pcigart_table(dev, gart_info);
  95         }
  96
  97         return 1;
  98 }
  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 = 0;
 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 #ifdef __linux__
 120                 if (pci_set_dma_mask(dev->pdev, gart_info->table_mask)) {
 121                         DRM_ERROR("fail to set dma mask to 0x%Lx\n",
 122                                   (unsigned long long)gart_info->table_mask);
 123                         ret = 1;
 124                         goto done;
 125                 }
 126 #endif
 127
 128                 ret = drm_ati_alloc_pcigart_table(dev, gart_info);
 129                 if (ret) {
 130                         DRM_ERROR("cannot allocate PCI GART page!\n");
 131                         goto done;
 132                 }
 133
 134                 pci_gart = gart_info->table_handle->vaddr;
 135                 address = gart_info->table_handle->vaddr;
 136                 bus_address = gart_info->table_handle->busaddr;
 137         } else {
 138                 address = gart_info->addr;
 139                 bus_address = gart_info->bus_addr;
 140                 DRM_DEBUG("PCI: Gart Table: VRAM %08LX mapped at %08lX\n",
 141                           (unsigned long long)bus_address,
 142                           (unsigned long)address);
 143         }
 144
 145
 146         max_ati_pages = (gart_info->table_size / sizeof(u32));
 147         max_real_pages = max_ati_pages / (PAGE_SIZE / ATI_PCIGART_PAGE_SIZE);
 148         pages = (entry->pages <= max_real_pages)
 149             ? entry->pages : max_real_pages;
 150
 151         if (gart_info->gart_table_location == DRM_ATI_GART_MAIN) {
 152                 memset(pci_gart, 0, max_ati_pages * sizeof(u32));
 153         } else {
 154                 memset_io((void __iomem *)map->handle, 0, max_ati_pages * sizeof(u32));
 155         }
 156
 157         gart_idx = 0;
 158         for (i = 0; i < pages; i++) {
 159 #ifdef __linux__
 160                 /* we need to support large memory configurations */
 161                 entry->busaddr[i] = pci_map_page(dev->pdev, entry->pagelist[i],
 162                                                  0, PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
 163                 if (pci_dma_mapping_error(dev->pdev, entry->busaddr[i])) {
 164                         DRM_ERROR("unable to map PCIGART pages!\n");
 165                         drm_ati_pcigart_cleanup(dev, gart_info);
 166                         address = NULL;
 167                         bus_address = 0;
 168                         goto done;
 169                 }
 170 #endif
 171                 page_base = (u32) entry->busaddr[i];
 172
 173                 for (j = 0; j < (PAGE_SIZE / ATI_PCIGART_PAGE_SIZE); j++) {
 174                         u32 val;
 175
 176                         switch(gart_info->gart_reg_if) {
 177                         case DRM_ATI_GART_IGP:
 178                                 val = page_base | 0xc;
 179                                 break;
 180                         case DRM_ATI_GART_PCIE:
 181                                 val = (page_base >> 8) | 0xc;
 182                                 break;
 183                         default:
 184                         case DRM_ATI_GART_PCI:
 185                                 val = page_base;
 186                                 break;
 187                         }
 188                         if (gart_info->gart_table_location ==
 189                             DRM_ATI_GART_MAIN)
 190                                 pci_gart[gart_idx] = cpu_to_le32(val);
 191                         else
 192                                 DRM_WRITE32(map, gart_idx * sizeof(u32), val);
 193                         gart_idx++;
 194                         page_base += ATI_PCIGART_PAGE_SIZE;
 195                 }
 196         }
 197         ret = 1;
 198
 199         wbinvd();
 200
 201       done:
 202         gart_info->addr = address;
 203         gart_info->bus_addr = bus_address;
 204         return ret;
 205 }