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ati_pcigart.c

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/**
 * \file ati_pcigart.c
 * ATI PCI GART support
 *
 * \author Gareth Hughes <gareth@valinux.com>
 */

/*
 * Created: Wed Dec 13 21:52:19 2000 by gareth@valinux.com
 *
 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */

#include "drmP.h"

00036 # define ATI_PCIGART_PAGE_SIZE            4096  /**< PCI GART page size */

static void *drm_ati_alloc_pcigart_table(int order)
{
      unsigned long address;
      struct page *page;
      int i;

      DRM_DEBUG("%s: alloc %d order\n", __FUNCTION__, order);

      address = __get_free_pages(GFP_KERNEL | __GFP_COMP,
                           order);
      if (address == 0UL) {
            return NULL;
      }

      page = virt_to_page(address);

      for (i = 0; i < order; i++, page++)
            SetPageReserved(page);

      DRM_DEBUG("%s: returning 0x%08lx\n", __FUNCTION__, address);
      return (void *)address;
}

static void drm_ati_free_pcigart_table(void *address, int order)
{
      struct page *page;
      int i;
      int num_pages = 1 << order;
      DRM_DEBUG("%s\n", __FUNCTION__);

      page = virt_to_page((unsigned long)address);

      for (i = 0; i < num_pages; i++, page++)
            ClearPageReserved(page);

      free_pages((unsigned long)address, order);
}

int drm_ati_pcigart_cleanup(struct drm_device *dev, struct drm_ati_pcigart_info *gart_info)
{
      struct drm_sg_mem *entry = dev->sg;
      unsigned long pages;
      int i;
      int order;
      int num_pages, max_pages;

      /* we need to support large memory configurations */
      if (!entry) {
            DRM_ERROR("no scatter/gather memory!\n");
            return 0;
      }

      order = drm_order((gart_info->table_size + (PAGE_SIZE-1)) / PAGE_SIZE);
      num_pages = 1 << order;

      if (gart_info->bus_addr) {
            if (gart_info->gart_table_location == DRM_ATI_GART_MAIN) {
                  pci_unmap_single(dev->pdev, gart_info->bus_addr,
                               num_pages * PAGE_SIZE,
                               PCI_DMA_TODEVICE);
            }

            max_pages = (gart_info->table_size / sizeof(u32));
            pages = (entry->pages <= max_pages)
              ? entry->pages : max_pages;

            for (i = 0; i < pages; i++) {
                  if (!entry->busaddr[i])
                        break;
                  pci_unmap_single(dev->pdev, entry->busaddr[i],
                               PAGE_SIZE, PCI_DMA_TODEVICE);
            }

            if (gart_info->gart_table_location == DRM_ATI_GART_MAIN)
                  gart_info->bus_addr = 0;
      }

      if (gart_info->gart_table_location == DRM_ATI_GART_MAIN
          && gart_info->addr) {
            drm_ati_free_pcigart_table(gart_info->addr, order);
            gart_info->addr = NULL;
      }

      return 1;
}
EXPORT_SYMBOL(drm_ati_pcigart_cleanup);

int drm_ati_pcigart_init(struct drm_device *dev, struct drm_ati_pcigart_info *gart_info)
{
      struct drm_sg_mem *entry = dev->sg;
      void *address = NULL;
      unsigned long pages;
      u32 *pci_gart, page_base, bus_address = 0;
      int i, j, ret = 0;
      int order;
      int max_pages;
      int num_pages;

      if (!entry) {
            DRM_ERROR("no scatter/gather memory!\n");
            goto done;
      }

      if (gart_info->gart_table_location == DRM_ATI_GART_MAIN) {
            DRM_DEBUG("PCI: no table in VRAM: using normal RAM\n");

            order = drm_order((gart_info->table_size +
                           (PAGE_SIZE-1)) / PAGE_SIZE);
            num_pages = 1 << order;
            address = drm_ati_alloc_pcigart_table(order);
            if (!address) {
                  DRM_ERROR("cannot allocate PCI GART page!\n");
                  goto done;
            }

            if (!dev->pdev) {
                  DRM_ERROR("PCI device unknown!\n");
                  goto done;
            }

            bus_address = pci_map_single(dev->pdev, address,
                                   num_pages * PAGE_SIZE,
                                   PCI_DMA_TODEVICE);
            if (bus_address == 0) {
                  DRM_ERROR("unable to map PCIGART pages!\n");
                  order = drm_order((gart_info->table_size +
                                 (PAGE_SIZE-1)) / PAGE_SIZE);
                  drm_ati_free_pcigart_table(address, order);
                  address = NULL;
                  goto done;
            }
      } else {
            address = gart_info->addr;
            bus_address = gart_info->bus_addr;
            DRM_DEBUG("PCI: Gart Table: VRAM %08X mapped at %08lX\n",
                    bus_address, (unsigned long)address);
      }

      pci_gart = (u32 *) address;

      max_pages = (gart_info->table_size / sizeof(u32));
      pages = (entry->pages <= max_pages)
          ? entry->pages : max_pages;

      memset(pci_gart, 0, max_pages * sizeof(u32));

      for (i = 0; i < pages; i++) {
            /* we need to support large memory configurations */
            entry->busaddr[i] = pci_map_single(dev->pdev,
                                       page_address(entry->
                                                pagelist[i]),
                                       PAGE_SIZE, PCI_DMA_TODEVICE);
            if (entry->busaddr[i] == 0) {
                  DRM_ERROR("unable to map PCIGART pages!\n");
                  drm_ati_pcigart_cleanup(dev, gart_info);
                  address = NULL;
                  bus_address = 0;
                  goto done;
            }
            page_base = (u32) entry->busaddr[i];

            for (j = 0; j < (PAGE_SIZE / ATI_PCIGART_PAGE_SIZE); j++) {
                  switch(gart_info->gart_reg_if) {
                  case DRM_ATI_GART_IGP:
                        *pci_gart = cpu_to_le32((page_base) | 0xc);
                        break;
                  case DRM_ATI_GART_PCIE:
                        *pci_gart = cpu_to_le32((page_base >> 8) | 0xc);
                        break;
                  default:
                  case DRM_ATI_GART_PCI:
                        *pci_gart = cpu_to_le32(page_base);
                        break;
                  }
                  pci_gart++;
                  page_base += ATI_PCIGART_PAGE_SIZE;
            }
      }

      ret = 1;

#if defined(__i386__) || defined(__x86_64__)
      wbinvd();
#else
      mb();
#endif

      done:
      gart_info->addr = address;
      gart_info->bus_addr = bus_address;
      return ret;
}
EXPORT_SYMBOL(drm_ati_pcigart_init);

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