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 | __GFP_COMP,
  63                                    ATI_PCIGART_TABLE_ORDER);
  64         if (address == 0UL) {
  65                 return NULL;
  66         }
  67
  68         page = virt_to_page(address);
  69
  70         for (i = 0; i < ATI_PCIGART_TABLE_PAGES; i++, page++)
  71                 SetPageReserved(page);
  72
  73         DRM_DEBUG("%s: returning 0x%08lx\n", __FUNCTION__, address);
  74         return (void *)address;
  75 }
  76
  77 static void drm_ati_free_pcigart_table(void *address)
  78 {
  79         struct page *page;
  80         int i;
  81         DRM_DEBUG("%s\n", __FUNCTION__);
  82
  83         page = virt_to_page((unsigned long)address);
  84
  85         for (i = 0; i < ATI_PCIGART_TABLE_PAGES; i++, page++)
  86                 ClearPageReserved(page);
  87
  88         free_pages((unsigned long)address, ATI_PCIGART_TABLE_ORDER);
  89 }
  90
  91 int drm_ati_pcigart_cleanup(drm_device_t *dev, drm_ati_pcigart_info *gart_info)
  92 {
  93         drm_sg_mem_t *entry = dev->sg;
  94         unsigned long pages;
  95         int i;
  96
  97         /* we need to support large memory configurations */
  98         if (!entry) {
  99                 DRM_ERROR("no scatter/gather memory!\n");
 100                 return 0;
 101         }
 102
 103         if (gart_info->bus_addr) {
 104                 if (gart_info->gart_table_location == DRM_ATI_GART_MAIN) {
 105                         pci_unmap_single(dev->pdev, gart_info->bus_addr,
 106                                          ATI_PCIGART_TABLE_PAGES * PAGE_SIZE,
 107                                          PCI_DMA_TODEVICE);
 108                 }
 109
 110                 pages = (entry->pages <= ATI_MAX_PCIGART_PAGES)
 111                     ? entry->pages : ATI_MAX_PCIGART_PAGES;
 112
 113                 for (i = 0; i < pages; i++) {
 114                         if (!entry->busaddr[i])
 115                                 break;
 116                         pci_unmap_single(dev->pdev, entry->busaddr[i],
 117                                          PAGE_SIZE, PCI_DMA_TODEVICE);
 118                 }
 119
 120                 if (gart_info->gart_table_location == DRM_ATI_GART_MAIN)
 121                         gart_info->bus_addr = 0;
 122         }
 123
 124         if (gart_info->gart_table_location == DRM_ATI_GART_MAIN
 125             && gart_info->addr) {
 126                 drm_ati_free_pcigart_table(gart_info->addr);
 127                 gart_info->addr = NULL;
 128         }
 129
 130         return 1;
 131 }
 132
 133 EXPORT_SYMBOL(drm_ati_pcigart_cleanup);
 134
 135 int drm_ati_pcigart_init(drm_device_t *dev, drm_ati_pcigart_info *gart_info)
 136 {
 137         drm_sg_mem_t *entry = dev->sg;
 138         void *address = NULL;
 139         unsigned long pages;
 140         u32 *pci_gart, page_base, bus_address = 0;
 141         int i, j, ret = 0;
 142
 143         if (!entry) {
 144                 DRM_ERROR("no scatter/gather memory!\n");
 145                 goto done;
 146         }
 147
 148         if (gart_info->gart_table_location == DRM_ATI_GART_MAIN) {
 149                 DRM_DEBUG("PCI: no table in VRAM: using normal RAM\n");
 150
 151                 address = drm_ati_alloc_pcigart_table();
 152                 if (!address) {
 153                         DRM_ERROR("cannot allocate PCI GART page!\n");
 154                         goto done;
 155                 }
 156
 157                 if (!dev->pdev) {
 158                         DRM_ERROR("PCI device unknown!\n");
 159                         goto done;
 160                 }
 161
 162                 bus_address = pci_map_single(dev->pdev, address,
 163                                              ATI_PCIGART_TABLE_PAGES *
 164                                              PAGE_SIZE, PCI_DMA_TODEVICE);
 165                 if (bus_address == 0) {
 166                         DRM_ERROR("unable to map PCIGART pages!\n");
 167                         drm_ati_free_pcigart_table(address);
 168                         address = NULL;
 169                         goto done;
 170                 }
 171         } else {
 172                 address = gart_info->addr;
 173                 bus_address = gart_info->bus_addr;
 174                 DRM_DEBUG("PCI: Gart Table: VRAM %08X mapped at %08lX\n",
 175                           bus_address, (unsigned long)address);
 176         }
 177
 178         pci_gart = (u32 *) address;
 179
 180         pages = (entry->pages <= ATI_MAX_PCIGART_PAGES)
 181             ? entry->pages : ATI_MAX_PCIGART_PAGES;
 182
 183         memset(pci_gart, 0, ATI_MAX_PCIGART_PAGES * sizeof(u32));
 184
 185         for (i = 0; i < pages; i++) {
 186                 /* we need to support large memory configurations */
 187                 entry->busaddr[i] = pci_map_single(dev->pdev,
 188                                                    page_address(entry->
 189                                                                 pagelist[i]),
 190                                                    PAGE_SIZE, PCI_DMA_TODEVICE);
 191                 if (entry->busaddr[i] == 0) {
 192                         DRM_ERROR("unable to map PCIGART pages!\n");
 193                         drm_ati_pcigart_cleanup(dev, gart_info);
 194                         address = NULL;
 195                         bus_address = 0;
 196                         goto done;
 197                 }
 198                 page_base = (u32) entry->busaddr[i];
 199
 200                 for (j = 0; j < (PAGE_SIZE / ATI_PCIGART_PAGE_SIZE); j++) {
 201                         if (gart_info->is_pcie)
 202                                 *pci_gart = cpu_to_le32((page_base >> 8) | 0xc);
 203                         else
 204                                 *pci_gart = cpu_to_le32(page_base);
 205                         pci_gart++;
 206                         page_base += ATI_PCIGART_PAGE_SIZE;
 207                 }
 208         }
 209
 210         ret = 1;
 211
 212 #if defined(__i386__) || defined(__x86_64__)
 213         wbinvd();
 214 #else
 215         mb();
 216 #endif
 217
 218       done:
 219         gart_info->addr = address;
 220         gart_info->bus_addr = bus_address;
 221         return ret;
 222 }
 223
 224 EXPORT_SYMBOL(drm_ati_pcigart_init);