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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 <linux/export.h>
#include <linux/pci.h>
#include <drm/drm_device.h>
#include <drm/drm_legacy.h>
#include <drm/drm_print.h>
#include "ati_pcigart.h"
# define ATI_PCIGART_PAGE_SIZE 4096 /**< PCI GART page size */
static int drm_ati_alloc_pcigart_table(struct drm_device *dev,
struct drm_ati_pcigart_info *gart_info)
{
drm_dma_handle_t *dmah = kmalloc(sizeof(drm_dma_handle_t), GFP_KERNEL);
if (!dmah)
return -ENOMEM;
dmah->size = gart_info->table_size;
dmah->vaddr = dma_alloc_coherent(dev->dev,
dmah->size,
&dmah->busaddr,
GFP_KERNEL);
if (!dmah->vaddr) {
kfree(dmah);
return -ENOMEM;
}
gart_info->table_handle = dmah;
return 0;
}
static void drm_ati_free_pcigart_table(struct drm_device *dev,
struct drm_ati_pcigart_info *gart_info)
{
drm_dma_handle_t *dmah = gart_info->table_handle;
dma_free_coherent(dev->dev, dmah->size, dmah->vaddr, dmah->busaddr);
kfree(dmah);
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;
struct pci_dev *pdev = to_pci_dev(dev->dev);
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(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;
}
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;
struct pci_dev *pdev = to_pci_dev(dev->dev);
void *address = NULL;
unsigned long pages;
u32 *pci_gart = NULL, page_base, gart_idx;
dma_addr_t bus_address = 0;
int i, j, ret = -ENOMEM;
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(pdev, gart_info->table_mask)) {
DRM_ERROR("fail to set dma mask to 0x%Lx\n",
(unsigned long long)gart_info->table_mask);
ret = -EFAULT;
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(pdev, entry->pagelist[i],
0, PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
if (pci_dma_mapping_error(pdev, entry->busaddr[i])) {
DRM_ERROR("unable to map PCIGART pages!\n");
drm_ati_pcigart_cleanup(dev, gart_info);
address = NULL;
bus_address = 0;
ret = -ENOMEM;
goto done;
}
page_base = (u32) entry->busaddr[i];
for (j = 0; j < (PAGE_SIZE / ATI_PCIGART_PAGE_SIZE); j++) {
u32 offset;
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 {
offset = gart_idx * sizeof(u32);
writel(val, (void __iomem *)map->handle + offset);
}
gart_idx++;
page_base += ATI_PCIGART_PAGE_SIZE;
}
}
ret = 0;
#if defined(__i386__) || defined(__x86_64__)
wbinvd();
#else
mb();
#endif
done:
gart_info->addr = address;
gart_info->bus_addr = bus_address;
return ret;
}
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