drm/linux-core/ati_pcigart.c

/**
 * \file ati_pcigart.h
 * 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"

#if PAGE_SIZE == 65536
# define ATI_PCIGART_TABLE_ORDER	0
# define ATI_PCIGART_TABLE_PAGES	(1 << 0)
#elif PAGE_SIZE == 16384
# define ATI_PCIGART_TABLE_ORDER	1
# define ATI_PCIGART_TABLE_PAGES	(1 << 1)
#elif PAGE_SIZE == 8192
# define ATI_PCIGART_TABLE_ORDER 	2
# define ATI_PCIGART_TABLE_PAGES 	(1 << 2)
#elif PAGE_SIZE == 4096
# define ATI_PCIGART_TABLE_ORDER 	3
# define ATI_PCIGART_TABLE_PAGES 	(1 << 3)
#else
# error - PAGE_SIZE not 64K, 16K, 8K or 4K
#endif

# define ATI_MAX_PCIGART_PAGES		8192	/**< 32 MB aperture, 4K pages */
# define ATI_PCIGART_PAGE_SIZE		4096	/**< PCI GART page size */

static unsigned long drm_ati_alloc_pcigart_table(void)
{
	unsigned long address;
	struct page *page;
	int i;
	DRM_DEBUG("%s\n", __FUNCTION__);

	address = __get_free_pages(GFP_KERNEL, ATI_PCIGART_TABLE_ORDER);
	if (address == 0UL) {
		return 0;
	}

	page = virt_to_page(address);

	for (i = 0; i < ATI_PCIGART_TABLE_PAGES; i++, page++) {
		get_page(page);
		SetPageReserved(page);
	}

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

static void drm_ati_free_pcigart_table(unsigned long address)
{
	struct page *page;
	int i;
	DRM_DEBUG("%s\n", __FUNCTION__);

	page = virt_to_page(address);

	for (i = 0; i < ATI_PCIGART_TABLE_PAGES; i++, page++) {
		__put_page(page);
		ClearPageReserved(page);
	}

	free_pages(address, ATI_PCIGART_TABLE_ORDER);
}

int drm_ati_pcigart_init(drm_device_t * dev,
			 unsigned long *addr, dma_addr_t * bus_addr)
{
	drm_sg_mem_t *entry = dev->sg;
	unsigned long address = 0;
	unsigned long pages;
	u32 *pci_gart, page_base, bus_address = 0;
	int i, j, ret = 0;

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

	address = drm_ati_alloc_pcigart_table();
	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, (void *)address,
				     ATI_PCIGART_TABLE_PAGES * PAGE_SIZE,
				     PCI_DMA_TODEVICE);
	if (bus_address == 0) {
		DRM_ERROR("unable to map PCIGART pages!\n");
		drm_ati_free_pcigart_table(address);
		address = 0;
		goto done;
	}

	pci_gart = (u32 *) address;

	pages = (entry->pages <= ATI_MAX_PCIGART_PAGES)
	    ? entry->pages : ATI_MAX_PCIGART_PAGES;

	memset(pci_gart, 0, ATI_MAX_PCIGART_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, address, bus_address);
			address = 0;
			bus_address = 0;
			goto done;
		}
		page_base = (u32) entry->busaddr[i];

		for (j = 0; j < (PAGE_SIZE / ATI_PCIGART_PAGE_SIZE); j++) {
			*pci_gart++ = cpu_to_le32(page_base);
			page_base += ATI_PCIGART_PAGE_SIZE;
		}
	}

	ret = 1;

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

      done:
	*addr = address;
	*bus_addr = bus_address;
	return ret;
}
EXPORT_SYMBOL(drm_ati_pcigart_init);

int drm_ati_pcigart_cleanup(drm_device_t * dev,
			    unsigned long addr, dma_addr_t bus_addr)
{
	drm_sg_mem_t *entry = dev->sg;
	unsigned long pages;
	int i;

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

	if (bus_addr) {
		pci_unmap_single(dev->pdev, bus_addr,
				 ATI_PCIGART_TABLE_PAGES * PAGE_SIZE,
				 PCI_DMA_TODEVICE);

		pages = (entry->pages <= ATI_MAX_PCIGART_PAGES)
		    ? entry->pages : ATI_MAX_PCIGART_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 (addr) {
		drm_ati_free_pcigart_table(addr);
	}

	return 1;
}
EXPORT_SYMBOL(drm_ati_pcigart_cleanup);