ati_pcigart.c

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/*
 * Created: Wed Dec 13 21:52:19 2000 by [email protected]
 *
 * 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 <linux/export.h>
#include <drm/drmP.h>

# define ATI_PCIGART_PAGE_SIZE      4096    
static int drm_ati_alloc_pcigart_table(struct drm_device *dev,
                       struct drm_ati_pcigart_info *gart_info)
{
    gart_info->table_handle = drm_pci_alloc(dev, gart_info->table_size,
                        PAGE_SIZE);
    if (gart_info->table_handle == NULL)
        return -ENOMEM;

    return 0;
}

static void drm_ati_free_pcigart_table(struct drm_device *dev,
                       struct drm_ati_pcigart_info *gart_info)
{
    drm_pci_free(dev, gart_info->table_handle);
    gart_info->table_handle = NULL;
}

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 max_pages;

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

    if (gart_info->bus_addr) {

        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_page(dev->pdev, entry->busaddr[i],
                     PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
        }

        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->table_handle) {
        drm_ati_free_pcigart_table(dev, gart_info);
    }

    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_local_map *map = &gart_info->mapping;
    struct drm_sg_mem *entry = dev->sg;
    void *address = NULL;
    unsigned long pages;
    u32 *pci_gart = NULL, page_base, gart_idx;
    dma_addr_t bus_address = 0;
    int i, j, ret = 0;
    int max_ati_pages, max_real_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");

        if (pci_set_dma_mask(dev->pdev, gart_info->table_mask)) {
            DRM_ERROR("fail to set dma mask to 0x%Lx\n",
                  (unsigned long long)gart_info->table_mask);
            ret = 1;
            goto done;
        }

        ret = drm_ati_alloc_pcigart_table(dev, gart_info);
        if (ret) {
            DRM_ERROR("cannot allocate PCI GART page!\n");
            goto done;
        }

        pci_gart = gart_info->table_handle->vaddr;
        address = gart_info->table_handle->vaddr;
        bus_address = gart_info->table_handle->busaddr;
    } else {
        address = gart_info->addr;
        bus_address = gart_info->bus_addr;
        DRM_DEBUG("PCI: Gart Table: VRAM %08LX mapped at %08lX\n",
              (unsigned long long)bus_address,
              (unsigned long)address);
    }


    max_ati_pages = (gart_info->table_size / sizeof(u32));
    max_real_pages = max_ati_pages / (PAGE_SIZE / ATI_PCIGART_PAGE_SIZE);
    pages = (entry->pages <= max_real_pages)
        ? entry->pages : max_real_pages;

    if (gart_info->gart_table_location == DRM_ATI_GART_MAIN) {
        memset(pci_gart, 0, max_ati_pages * sizeof(u32));
    } else {
        memset_io((void __iomem *)map->handle, 0, max_ati_pages * sizeof(u32));
    }

    gart_idx = 0;
    for (i = 0; i < pages; i++) {
        /* we need to support large memory configurations */
        entry->busaddr[i] = pci_map_page(dev->pdev, entry->pagelist[i],
                         0, PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
        if (pci_dma_mapping_error(dev->pdev, entry->busaddr[i])) {
            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++) {
            u32 val;

            switch(gart_info->gart_reg_if) {
            case DRM_ATI_GART_IGP:
                val = page_base | 0xc;
                break;
            case DRM_ATI_GART_PCIE:
                val = (page_base >> 8) | 0xc;
                break;
            default:
            case DRM_ATI_GART_PCI:
                val = page_base;
                break;
            }
            if (gart_info->gart_table_location ==
                DRM_ATI_GART_MAIN)
                pci_gart[gart_idx] = cpu_to_le32(val);
            else
                DRM_WRITE32(map, gart_idx * sizeof(u32), val);
            gart_idx++;
            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);