drivers/char/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 #if PAGE_SIZE == 65536
  37 # define ATI_PCIGART_TABLE_ORDER        0
  38 # define ATI_PCIGART_TABLE_PAGES        (1 << 0)
  39 #elif PAGE_SIZE == 16384
  40 # define ATI_PCIGART_TABLE_ORDER        1
  41 # define ATI_PCIGART_TABLE_PAGES        (1 << 1)
  42 #elif PAGE_SIZE == 8192
  43 # define ATI_PCIGART_TABLE_ORDER        2
  44 # define ATI_PCIGART_TABLE_PAGES        (1 << 2)
  45 #elif PAGE_SIZE == 4096
  46 # define ATI_PCIGART_TABLE_ORDER        3
  47 # define ATI_PCIGART_TABLE_PAGES        (1 << 3)
  48 #else
  49 # error - PAGE_SIZE not 64K, 16K, 8K or 4K
  50 #endif
  51
  52 # define ATI_MAX_PCIGART_PAGES          8192    /**< 32 MB aperture, 4K pages */
  53 # define ATI_PCIGART_PAGE_SIZE          4096    /**< PCI GART page size */
  54
  55 static void *drm_ati_alloc_pcigart_table(void)
  56 {
  57         unsigned long address;
  58         struct page *page;
  59         int i;
  60         DRM_DEBUG("%s\n", __FUNCTION__);
  61
  62         address = __get_free_pages(GFP_KERNEL, ATI_PCIGART_TABLE_ORDER);
  63         if (address == 0UL) {
  64                 return 0;
  65         }
  66
  67         page = virt_to_page(address);
  68
  69         for (i = 0; i < ATI_PCIGART_TABLE_PAGES; i++, page++) {
  70                 get_page(page);
  71                 SetPageReserved(page);
  72         }
  73
  74         DRM_DEBUG("%s: returning 0x%08lx\n", __FUNCTION__, address);
  75         return (void *)address;
  76 }
  77
  78 static void drm_ati_free_pcigart_table(void *address)
  79 {
  80         struct page *page;
  81         int i;
  82         DRM_DEBUG("%s\n", __FUNCTION__);
  83
  84         page = virt_to_page((unsigned long)address);
  85
  86         for (i = 0; i < ATI_PCIGART_TABLE_PAGES; i++, page++) {
  87                 __put_page(page);
  88                 ClearPageReserved(page);
  89         }
  90
  91         free_pages((unsigned long)address, ATI_PCIGART_TABLE_ORDER);
  92 }
  93
  94 int drm_ati_pcigart_cleanup(drm_device_t *dev, drm_ati_pcigart_info *gart_info)
  95 {
  96         drm_sg_mem_t *entry = dev->sg;
  97         unsigned long pages;
  98         int i;
  99
 100         /* we need to support large memory configurations */
 101         if (!entry) {
 102                 DRM_ERROR("no scatter/gather memory!\n");
 103                 return 0;
 104         }
 105
 106         if (gart_info->bus_addr) {
 107                 if (gart_info->gart_table_location == DRM_ATI_GART_MAIN) {
 108                         pci_unmap_single(dev->pdev, gart_info->bus_addr,
 109                                          ATI_PCIGART_TABLE_PAGES * PAGE_SIZE,
 110                                          PCI_DMA_TODEVICE);
 111                 }
 112
 113                 pages = (entry->pages <= ATI_MAX_PCIGART_PAGES)
 114                     ? entry->pages : ATI_MAX_PCIGART_PAGES;
 115
 116                 for (i = 0; i < pages; i++) {
 117                         if (!entry->busaddr[i])
 118                                 break;
 119                         pci_unmap_single(dev->pdev, entry->busaddr[i],
 120                                          PAGE_SIZE, PCI_DMA_TODEVICE);
 121                 }
 122
 123                 if (gart_info->gart_table_location == DRM_ATI_GART_MAIN)
 124                         gart_info->bus_addr = 0;
 125         }
 126
 127         if (gart_info->gart_table_location == DRM_ATI_GART_MAIN
 128             && gart_info->addr) {
 129                 drm_ati_free_pcigart_table(gart_info->addr);
 130                 gart_info->addr = 0;
 131         }
 132
 133         return 1;
 134 }
 135
 136 EXPORT_SYMBOL(drm_ati_pcigart_cleanup);
 137
 138 int drm_ati_pcigart_init(drm_device_t *dev, drm_ati_pcigart_info *gart_info)
 139 {
 140         drm_sg_mem_t *entry = dev->sg;
 141         void *address = NULL;
 142         unsigned long pages;
 143         u32 *pci_gart, page_base, bus_address = 0;
 144         int i, j, ret = 0;
 145
 146         if (!entry) {
 147                 DRM_ERROR("no scatter/gather memory!\n");
 148                 goto done;
 149         }
 150
 151         if (gart_info->gart_table_location == DRM_ATI_GART_MAIN) {
 152                 DRM_DEBUG("PCI: no table in VRAM: using normal RAM\n");
 153
 154                 address = drm_ati_alloc_pcigart_table();
 155                 if (!address) {
 156                         DRM_ERROR("cannot allocate PCI GART page!\n");
 157                         goto done;
 158                 }
 159
 160                 if (!dev->pdev) {
 161                         DRM_ERROR("PCI device unknown!\n");
 162                         goto done;
 163                 }
 164
 165                 bus_address = pci_map_single(dev->pdev, address,
 166                                              ATI_PCIGART_TABLE_PAGES *
 167                                              PAGE_SIZE, PCI_DMA_TODEVICE);
 168                 if (bus_address == 0) {
 169                         DRM_ERROR("unable to map PCIGART pages!\n");
 170                         drm_ati_free_pcigart_table(address);
 171                         address = 0;
 172                         goto done;
 173                 }
 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                           bus_address, (unsigned long)address);
 179         }
 180
 181         pci_gart = (u32 *) address;
 182
 183         pages = (entry->pages <= ATI_MAX_PCIGART_PAGES)
 184             ? entry->pages : ATI_MAX_PCIGART_PAGES;
 185
 186         memset(pci_gart, 0, ATI_MAX_PCIGART_PAGES * sizeof(u32));
 187
 188         for (i = 0; i < pages; i++) {
 189                 /* we need to support large memory configurations */
 190                 entry->busaddr[i] = pci_map_single(dev->pdev,
 191                                                    page_address(entry->
 192                                                                 pagelist[i]),
 193                                                    PAGE_SIZE, PCI_DMA_TODEVICE);
 194                 if (entry->busaddr[i] == 0) {
 195                         DRM_ERROR("unable to map PCIGART pages!\n");
 196                         drm_ati_pcigart_cleanup(dev, gart_info);
 197                         address = NULL;
 198                         bus_address = 0;
 199                         goto done;
 200                 }
 201                 page_base = (u32) entry->busaddr[i];
 202
 203                 for (j = 0; j < (PAGE_SIZE / ATI_PCIGART_PAGE_SIZE); j++) {
 204                         if (gart_info->is_pcie)
 205                                 *pci_gart = cpu_to_le32((page_base >> 8) | 0xc);
 206                         else
 207                                 *pci_gart = cpu_to_le32(page_base);
 208                         pci_gart++;
 209                         page_base += ATI_PCIGART_PAGE_SIZE;
 210                 }
 211         }
 212
 213         ret = 1;
 214
 215 #if defined(__i386__) || defined(__x86_64__)
 216         wbinvd();
 217 #else
 218         mb();
 219 #endif
 220
 221       done:
 222         gart_info->addr = address;
 223         gart_info->bus_addr = bus_address;
 224         return ret;
 225 }
 226
 227 EXPORT_SYMBOL(drm_ati_pcigart_init);