generic.c 35 KB
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/*
 * AGPGART driver.
 * Copyright (C) 2004 Silicon Graphics, Inc.
 * Copyright (C) 2002-2005 Dave Jones.
 * Copyright (C) 1999 Jeff Hartmann.
 * Copyright (C) 1999 Precision Insight, Inc.
 * Copyright (C) 1999 Xi Graphics, Inc.
 *
 * 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 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
 * JEFF HARTMANN, OR ANY OTHER CONTRIBUTORS 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.
 *
 * TODO:
 * - Allocate more than order 0 pages to avoid too much linear map splitting.
 */
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/pagemap.h>
#include <linux/miscdevice.h>
#include <linux/pm.h>
#include <linux/agp_backend.h>
#include <linux/vmalloc.h>
#include <linux/dma-mapping.h>
#include <linux/mm.h>
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#include <linux/sched.h>
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#include <asm/io.h>
#include <asm/cacheflush.h>
#include <asm/pgtable.h>
#include "agp.h"

__u32 *agp_gatt_table;
int agp_memory_reserved;

/*
 * Needed by the Nforce GART driver for the time being. Would be
 * nice to do this some other way instead of needing this export.
 */
EXPORT_SYMBOL_GPL(agp_memory_reserved);

/*
 * Generic routines for handling agp_memory structures -
 * They use the basic page allocation routines to do the brunt of the work.
 */

void agp_free_key(int key)
{
	if (key < 0)
		return;

	if (key < MAXKEY)
		clear_bit(key, agp_bridge->key_list);
}
EXPORT_SYMBOL(agp_free_key);


static int agp_get_key(void)
{
	int bit;

	bit = find_first_zero_bit(agp_bridge->key_list, MAXKEY);
	if (bit < MAXKEY) {
		set_bit(bit, agp_bridge->key_list);
		return bit;
	}
	return -1;
}

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void agp_flush_chipset(struct agp_bridge_data *bridge)
{
	if (bridge->driver->chipset_flush)
		bridge->driver->chipset_flush(bridge);
}
EXPORT_SYMBOL(agp_flush_chipset);

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/*
 * Use kmalloc if possible for the page list. Otherwise fall back to
 * vmalloc. This speeds things up and also saves memory for small AGP
 * regions.
 */

void agp_alloc_page_array(size_t size, struct agp_memory *mem)
{
	mem->memory = NULL;
	mem->vmalloc_flag = 0;

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	if (size <= 2*PAGE_SIZE)
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		mem->memory = kmalloc(size, GFP_KERNEL | __GFP_NORETRY);
	if (mem->memory == NULL) {
		mem->memory = vmalloc(size);
		mem->vmalloc_flag = 1;
	}
}
EXPORT_SYMBOL(agp_alloc_page_array);

void agp_free_page_array(struct agp_memory *mem)
{
	if (mem->vmalloc_flag) {
		vfree(mem->memory);
	} else {
		kfree(mem->memory);
	}
}
EXPORT_SYMBOL(agp_free_page_array);


static struct agp_memory *agp_create_user_memory(unsigned long num_agp_pages)
{
	struct agp_memory *new;
	unsigned long alloc_size = num_agp_pages*sizeof(struct page *);

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	new = kzalloc(sizeof(struct agp_memory), GFP_KERNEL);
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	if (new == NULL)
		return NULL;

	new->key = agp_get_key();

	if (new->key < 0) {
		kfree(new);
		return NULL;
	}

	agp_alloc_page_array(alloc_size, new);

	if (new->memory == NULL) {
		agp_free_key(new->key);
		kfree(new);
		return NULL;
	}
	new->num_scratch_pages = 0;
	return new;
}

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struct agp_memory *agp_create_memory(int scratch_pages)
{
	struct agp_memory *new;

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	new = kzalloc(sizeof(struct agp_memory), GFP_KERNEL);
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	if (new == NULL)
		return NULL;

	new->key = agp_get_key();

	if (new->key < 0) {
		kfree(new);
		return NULL;
	}
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	agp_alloc_page_array(PAGE_SIZE * scratch_pages, new);
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	if (new->memory == NULL) {
		agp_free_key(new->key);
		kfree(new);
		return NULL;
	}
	new->num_scratch_pages = scratch_pages;
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	new->type = AGP_NORMAL_MEMORY;
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	return new;
}
EXPORT_SYMBOL(agp_create_memory);

/**
 *	agp_free_memory - free memory associated with an agp_memory pointer.
 *
 *	@curr:		agp_memory pointer to be freed.
 *
 *	It is the only function that can be called when the backend is not owned
 *	by the caller.  (So it can free memory on client death.)
 */
void agp_free_memory(struct agp_memory *curr)
{
	size_t i;

	if (curr == NULL)
		return;

	if (curr->is_bound == TRUE)
		agp_unbind_memory(curr);

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	if (curr->type >= AGP_USER_TYPES) {
		agp_generic_free_by_type(curr);
		return;
	}

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	if (curr->type != 0) {
		curr->bridge->driver->free_by_type(curr);
		return;
	}
	if (curr->page_count != 0) {
		for (i = 0; i < curr->page_count; i++) {
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			curr->memory[i] = (unsigned long)gart_to_virt(curr->memory[i]);
			curr->bridge->driver->agp_destroy_page((void *)curr->memory[i],
							       AGP_PAGE_DESTROY_UNMAP);
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		}
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		for (i = 0; i < curr->page_count; i++) {
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			curr->bridge->driver->agp_destroy_page((void *)curr->memory[i],
							       AGP_PAGE_DESTROY_FREE);
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		}
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	}
	agp_free_key(curr->key);
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	agp_free_page_array(curr);
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	kfree(curr);
}
EXPORT_SYMBOL(agp_free_memory);

#define ENTRIES_PER_PAGE		(PAGE_SIZE / sizeof(unsigned long))

/**
 *	agp_allocate_memory  -  allocate a group of pages of a certain type.
 *
 *	@page_count:	size_t argument of the number of pages
 *	@type:	u32 argument of the type of memory to be allocated.
 *
 *	Every agp bridge device will allow you to allocate AGP_NORMAL_MEMORY which
 *	maps to physical ram.  Any other type is device dependent.
 *
 *	It returns NULL whenever memory is unavailable.
 */
struct agp_memory *agp_allocate_memory(struct agp_bridge_data *bridge,
					size_t page_count, u32 type)
{
	int scratch_pages;
	struct agp_memory *new;
	size_t i;

	if (!bridge)
		return NULL;

	if ((atomic_read(&bridge->current_memory_agp) + page_count) > bridge->max_memory_agp)
		return NULL;

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	if (type >= AGP_USER_TYPES) {
		new = agp_generic_alloc_user(page_count, type);
		if (new)
			new->bridge = bridge;
		return new;
	}

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	if (type != 0) {
		new = bridge->driver->alloc_by_type(page_count, type);
		if (new)
			new->bridge = bridge;
		return new;
	}

	scratch_pages = (page_count + ENTRIES_PER_PAGE - 1) / ENTRIES_PER_PAGE;

	new = agp_create_memory(scratch_pages);

	if (new == NULL)
		return NULL;

	for (i = 0; i < page_count; i++) {
		void *addr = bridge->driver->agp_alloc_page(bridge);

		if (addr == NULL) {
			agp_free_memory(new);
			return NULL;
		}
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		new->memory[i] = virt_to_gart(addr);
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		new->page_count++;
	}
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	new->bridge = bridge;
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	return new;
}
EXPORT_SYMBOL(agp_allocate_memory);


/* End - Generic routines for handling agp_memory structures */


static int agp_return_size(void)
{
	int current_size;
	void *temp;

	temp = agp_bridge->current_size;

	switch (agp_bridge->driver->size_type) {
	case U8_APER_SIZE:
		current_size = A_SIZE_8(temp)->size;
		break;
	case U16_APER_SIZE:
		current_size = A_SIZE_16(temp)->size;
		break;
	case U32_APER_SIZE:
		current_size = A_SIZE_32(temp)->size;
		break;
	case LVL2_APER_SIZE:
		current_size = A_SIZE_LVL2(temp)->size;
		break;
	case FIXED_APER_SIZE:
		current_size = A_SIZE_FIX(temp)->size;
		break;
	default:
		current_size = 0;
		break;
	}

	current_size -= (agp_memory_reserved / (1024*1024));
	if (current_size <0)
		current_size = 0;
	return current_size;
}


int agp_num_entries(void)
{
	int num_entries;
	void *temp;

	temp = agp_bridge->current_size;

	switch (agp_bridge->driver->size_type) {
	case U8_APER_SIZE:
		num_entries = A_SIZE_8(temp)->num_entries;
		break;
	case U16_APER_SIZE:
		num_entries = A_SIZE_16(temp)->num_entries;
		break;
	case U32_APER_SIZE:
		num_entries = A_SIZE_32(temp)->num_entries;
		break;
	case LVL2_APER_SIZE:
		num_entries = A_SIZE_LVL2(temp)->num_entries;
		break;
	case FIXED_APER_SIZE:
		num_entries = A_SIZE_FIX(temp)->num_entries;
		break;
	default:
		num_entries = 0;
		break;
	}

	num_entries -= agp_memory_reserved>>PAGE_SHIFT;
	if (num_entries<0)
		num_entries = 0;
	return num_entries;
}
EXPORT_SYMBOL_GPL(agp_num_entries);


/**
 *	agp_copy_info  -  copy bridge state information
 *
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 *	@info:		agp_kern_info pointer.  The caller should insure that this pointer is valid.
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 *
 *	This function copies information about the agp bridge device and the state of
 *	the agp backend into an agp_kern_info pointer.
 */
int agp_copy_info(struct agp_bridge_data *bridge, struct agp_kern_info *info)
{
	memset(info, 0, sizeof(struct agp_kern_info));
	if (!bridge) {
		info->chipset = NOT_SUPPORTED;
		return -EIO;
	}

	info->version.major = bridge->version->major;
	info->version.minor = bridge->version->minor;
	info->chipset = SUPPORTED;
	info->device = bridge->dev;
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	if (bridge->mode & AGPSTAT_MODE_3_0)
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		info->mode = bridge->mode & ~AGP3_RESERVED_MASK;
	else
		info->mode = bridge->mode & ~AGP2_RESERVED_MASK;
	info->aper_base = bridge->gart_bus_addr;
	info->aper_size = agp_return_size();
	info->max_memory = bridge->max_memory_agp;
	info->current_memory = atomic_read(&bridge->current_memory_agp);
	info->cant_use_aperture = bridge->driver->cant_use_aperture;
	info->vm_ops = bridge->vm_ops;
	info->page_mask = ~0UL;
	return 0;
}
EXPORT_SYMBOL(agp_copy_info);

/* End - Routine to copy over information structure */

/*
 * Routines for handling swapping of agp_memory into the GATT -
 * These routines take agp_memory and insert them into the GATT.
 * They call device specific routines to actually write to the GATT.
 */

/**
 *	agp_bind_memory  -  Bind an agp_memory structure into the GATT.
 *
 *	@curr:		agp_memory pointer
 *	@pg_start:	an offset into the graphics aperture translation table
 *
 *	It returns -EINVAL if the pointer == NULL.
 *	It returns -EBUSY if the area of the table requested is already in use.
 */
int agp_bind_memory(struct agp_memory *curr, off_t pg_start)
{
	int ret_val;

	if (curr == NULL)
		return -EINVAL;

	if (curr->is_bound == TRUE) {
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		printk(KERN_INFO PFX "memory %p is already bound!\n", curr);
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		return -EINVAL;
	}
	if (curr->is_flushed == FALSE) {
		curr->bridge->driver->cache_flush();
		curr->is_flushed = TRUE;
	}
	ret_val = curr->bridge->driver->insert_memory(curr, pg_start, curr->type);

	if (ret_val != 0)
		return ret_val;

	curr->is_bound = TRUE;
	curr->pg_start = pg_start;
	return 0;
}
EXPORT_SYMBOL(agp_bind_memory);


/**
 *	agp_unbind_memory  -  Removes an agp_memory structure from the GATT
 *
 * @curr:	agp_memory pointer to be removed from the GATT.
 *
 * It returns -EINVAL if this piece of agp_memory is not currently bound to
 * the graphics aperture translation table or if the agp_memory pointer == NULL
 */
int agp_unbind_memory(struct agp_memory *curr)
{
	int ret_val;

	if (curr == NULL)
		return -EINVAL;

	if (curr->is_bound != TRUE) {
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		printk(KERN_INFO PFX "memory %p was not bound!\n", curr);
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		return -EINVAL;
	}

	ret_val = curr->bridge->driver->remove_memory(curr, curr->pg_start, curr->type);

	if (ret_val != 0)
		return ret_val;

	curr->is_bound = FALSE;
	curr->pg_start = 0;
	return 0;
}
EXPORT_SYMBOL(agp_unbind_memory);

/* End - Routines for handling swapping of agp_memory into the GATT */


/* Generic Agp routines - Start */
static void agp_v2_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
{
	u32 tmp;

	if (*requested_mode & AGP2_RESERVED_MASK) {
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		printk(KERN_INFO PFX "reserved bits set (%x) in mode 0x%x. Fixed.\n",
			*requested_mode & AGP2_RESERVED_MASK, *requested_mode);
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		*requested_mode &= ~AGP2_RESERVED_MASK;
	}

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	/*
	 * Some dumb bridges are programmed to disobey the AGP2 spec.
	 * This is likely a BIOS misprogramming rather than poweron default, or
	 * it would be a lot more common.
	 * https://bugs.freedesktop.org/show_bug.cgi?id=8816
	 * AGPv2 spec 6.1.9 states:
	 *   The RATE field indicates the data transfer rates supported by this
	 *   device. A.G.P. devices must report all that apply.
	 * Fix them up as best we can.
	 */
	switch (*bridge_agpstat & 7) {
	case 4:
		*bridge_agpstat |= (AGPSTAT2_2X | AGPSTAT2_1X);
		printk(KERN_INFO PFX "BIOS bug. AGP bridge claims to only support x4 rate"
			"Fixing up support for x2 & x1\n");
		break;
	case 2:
		*bridge_agpstat |= AGPSTAT2_1X;
		printk(KERN_INFO PFX "BIOS bug. AGP bridge claims to only support x2 rate"
			"Fixing up support for x1\n");
		break;
	default:
		break;
	}

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	/* Check the speed bits make sense. Only one should be set. */
	tmp = *requested_mode & 7;
	switch (tmp) {
		case 0:
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			printk(KERN_INFO PFX "%s tried to set rate=x0. Setting to x1 mode.\n", current->comm);
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			*requested_mode |= AGPSTAT2_1X;
			break;
		case 1:
		case 2:
			break;
		case 3:
			*requested_mode &= ~(AGPSTAT2_1X);	/* rate=2 */
			break;
		case 4:
			break;
		case 5:
		case 6:
		case 7:
			*requested_mode &= ~(AGPSTAT2_1X|AGPSTAT2_2X); /* rate=4*/
			break;
	}

	/* disable SBA if it's not supported */
	if (!((*bridge_agpstat & AGPSTAT_SBA) && (*vga_agpstat & AGPSTAT_SBA) && (*requested_mode & AGPSTAT_SBA)))
		*bridge_agpstat &= ~AGPSTAT_SBA;

	/* Set rate */
	if (!((*bridge_agpstat & AGPSTAT2_4X) && (*vga_agpstat & AGPSTAT2_4X) && (*requested_mode & AGPSTAT2_4X)))
		*bridge_agpstat &= ~AGPSTAT2_4X;

	if (!((*bridge_agpstat & AGPSTAT2_2X) && (*vga_agpstat & AGPSTAT2_2X) && (*requested_mode & AGPSTAT2_2X)))
		*bridge_agpstat &= ~AGPSTAT2_2X;

	if (!((*bridge_agpstat & AGPSTAT2_1X) && (*vga_agpstat & AGPSTAT2_1X) && (*requested_mode & AGPSTAT2_1X)))
		*bridge_agpstat &= ~AGPSTAT2_1X;

	/* Now we know what mode it should be, clear out the unwanted bits. */
	if (*bridge_agpstat & AGPSTAT2_4X)
		*bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_2X);	/* 4X */

	if (*bridge_agpstat & AGPSTAT2_2X)
		*bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_4X);	/* 2X */

	if (*bridge_agpstat & AGPSTAT2_1X)
		*bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);	/* 1X */

	/* Apply any errata. */
	if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
		*bridge_agpstat &= ~AGPSTAT_FW;

	if (agp_bridge->flags & AGP_ERRATA_SBA)
		*bridge_agpstat &= ~AGPSTAT_SBA;

	if (agp_bridge->flags & AGP_ERRATA_1X) {
		*bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
		*bridge_agpstat |= AGPSTAT2_1X;
	}

	/* If we've dropped down to 1X, disable fast writes. */
	if (*bridge_agpstat & AGPSTAT2_1X)
		*bridge_agpstat &= ~AGPSTAT_FW;
}

/*
 * requested_mode = Mode requested by (typically) X.
 * bridge_agpstat = PCI_AGP_STATUS from agp bridge.
 * vga_agpstat = PCI_AGP_STATUS from graphic card.
 */
static void agp_v3_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
{
	u32 origbridge=*bridge_agpstat, origvga=*vga_agpstat;
	u32 tmp;

	if (*requested_mode & AGP3_RESERVED_MASK) {
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		printk(KERN_INFO PFX "reserved bits set (%x) in mode 0x%x. Fixed.\n",
			*requested_mode & AGP3_RESERVED_MASK, *requested_mode);
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		*requested_mode &= ~AGP3_RESERVED_MASK;
	}

	/* Check the speed bits make sense. */
	tmp = *requested_mode & 7;
	if (tmp == 0) {
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		printk(KERN_INFO PFX "%s tried to set rate=x0. Setting to AGP3 x4 mode.\n", current->comm);
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		*requested_mode |= AGPSTAT3_4X;
	}
	if (tmp >= 3) {
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		printk(KERN_INFO PFX "%s tried to set rate=x%d. Setting to AGP3 x8 mode.\n", current->comm, tmp * 4);
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		*requested_mode = (*requested_mode & ~7) | AGPSTAT3_8X;
	}

	/* ARQSZ - Set the value to the maximum one.
	 * Don't allow the mode register to override values. */
	*bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_ARQSZ) |
		max_t(u32,(*bridge_agpstat & AGPSTAT_ARQSZ),(*vga_agpstat & AGPSTAT_ARQSZ)));

	/* Calibration cycle.
	 * Don't allow the mode register to override values. */
	*bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_CAL_MASK) |
		min_t(u32,(*bridge_agpstat & AGPSTAT_CAL_MASK),(*vga_agpstat & AGPSTAT_CAL_MASK)));

	/* SBA *must* be supported for AGP v3 */
	*bridge_agpstat |= AGPSTAT_SBA;

	/*
	 * Set speed.
	 * Check for invalid speeds. This can happen when applications
	 * written before the AGP 3.0 standard pass AGP2.x modes to AGP3 hardware
	 */
	if (*requested_mode & AGPSTAT_MODE_3_0) {
		/*
		 * Caller hasn't a clue what it is doing. Bridge is in 3.0 mode,
		 * have been passed a 3.0 mode, but with 2.x speed bits set.
		 * AGP2.x 4x -> AGP3.0 4x.
		 */
		if (*requested_mode & AGPSTAT2_4X) {
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			printk(KERN_INFO PFX "%s passes broken AGP3 flags (%x). Fixed.\n",
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						current->comm, *requested_mode);
			*requested_mode &= ~AGPSTAT2_4X;
			*requested_mode |= AGPSTAT3_4X;
		}
	} else {
		/*
		 * The caller doesn't know what they are doing. We are in 3.0 mode,
		 * but have been passed an AGP 2.x mode.
		 * Convert AGP 1x,2x,4x -> AGP 3.0 4x.
		 */
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		printk(KERN_INFO PFX "%s passes broken AGP2 flags (%x) in AGP3 mode. Fixed.\n",
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					current->comm, *requested_mode);
		*requested_mode &= ~(AGPSTAT2_4X | AGPSTAT2_2X | AGPSTAT2_1X);
		*requested_mode |= AGPSTAT3_4X;
	}

	if (*requested_mode & AGPSTAT3_8X) {
		if (!(*bridge_agpstat & AGPSTAT3_8X)) {
			*bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
			*bridge_agpstat |= AGPSTAT3_4X;
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			printk(KERN_INFO PFX "%s requested AGPx8 but bridge not capable.\n", current->comm);
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			return;
		}
		if (!(*vga_agpstat & AGPSTAT3_8X)) {
			*bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
			*bridge_agpstat |= AGPSTAT3_4X;
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			printk(KERN_INFO PFX "%s requested AGPx8 but graphic card not capable.\n", current->comm);
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			return;
		}
		/* All set, bridge & device can do AGP x8*/
		*bridge_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
		goto done;

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	} else if (*requested_mode & AGPSTAT3_4X) {
		*bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
		*bridge_agpstat |= AGPSTAT3_4X;
		goto done;

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	} else {

		/*
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		 * If we didn't specify an AGP mode, we see if both
		 * the graphics card, and the bridge can do x8, and use if so.
		 * If not, we fall back to x4 mode.
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		 */
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		if ((*bridge_agpstat & AGPSTAT3_8X) && (*vga_agpstat & AGPSTAT3_8X)) {
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			printk(KERN_INFO PFX "No AGP mode specified. Setting to highest mode "
				"supported by bridge & card (x8).\n");
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			*bridge_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
			*vga_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
		} else {
			printk(KERN_INFO PFX "Fell back to AGPx4 mode because");
			if (!(*bridge_agpstat & AGPSTAT3_8X)) {
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				printk(KERN_INFO PFX "bridge couldn't do x8. bridge_agpstat:%x (orig=%x)\n",
					*bridge_agpstat, origbridge);
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				*bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
				*bridge_agpstat |= AGPSTAT3_4X;
			}
			if (!(*vga_agpstat & AGPSTAT3_8X)) {
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				printk(KERN_INFO PFX "graphics card couldn't do x8. vga_agpstat:%x (orig=%x)\n",
					*vga_agpstat, origvga);
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				*vga_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
				*vga_agpstat |= AGPSTAT3_4X;
			}
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		}
	}

done:
	/* Apply any errata. */
	if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
		*bridge_agpstat &= ~AGPSTAT_FW;

	if (agp_bridge->flags & AGP_ERRATA_SBA)
		*bridge_agpstat &= ~AGPSTAT_SBA;

	if (agp_bridge->flags & AGP_ERRATA_1X) {
		*bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
		*bridge_agpstat |= AGPSTAT2_1X;
	}
}


/**
 * agp_collect_device_status - determine correct agp_cmd from various agp_stat's
 * @bridge: an agp_bridge_data struct allocated for the AGP host bridge.
 * @requested_mode: requested agp_stat from userspace (Typically from X)
 * @bridge_agpstat: current agp_stat from AGP bridge.
 *
 * This function will hunt for an AGP graphics card, and try to match
 * the requested mode to the capabilities of both the bridge and the card.
 */
u32 agp_collect_device_status(struct agp_bridge_data *bridge, u32 requested_mode, u32 bridge_agpstat)
{
	struct pci_dev *device = NULL;
	u32 vga_agpstat;
	u8 cap_ptr;

	for (;;) {
		device = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, device);
		if (!device) {
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			printk(KERN_INFO PFX "Couldn't find an AGP VGA controller.\n");
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			return 0;
		}
		cap_ptr = pci_find_capability(device, PCI_CAP_ID_AGP);
		if (cap_ptr)
			break;
	}

	/*
	 * Ok, here we have a AGP device. Disable impossible
	 * settings, and adjust the readqueue to the minimum.
	 */
	pci_read_config_dword(device, cap_ptr+PCI_AGP_STATUS, &vga_agpstat);

	/* adjust RQ depth */
	bridge_agpstat = ((bridge_agpstat & ~AGPSTAT_RQ_DEPTH) |
	     min_t(u32, (requested_mode & AGPSTAT_RQ_DEPTH),
		 min_t(u32, (bridge_agpstat & AGPSTAT_RQ_DEPTH), (vga_agpstat & AGPSTAT_RQ_DEPTH))));

	/* disable FW if it's not supported */
	if (!((bridge_agpstat & AGPSTAT_FW) &&
		 (vga_agpstat & AGPSTAT_FW) &&
		 (requested_mode & AGPSTAT_FW)))
		bridge_agpstat &= ~AGPSTAT_FW;

	/* Check to see if we are operating in 3.0 mode */
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	if (agp_bridge->mode & AGPSTAT_MODE_3_0)
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		agp_v3_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
	else
		agp_v2_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);

	pci_dev_put(device);
	return bridge_agpstat;
}
EXPORT_SYMBOL(agp_collect_device_status);


void agp_device_command(u32 bridge_agpstat, int agp_v3)
{
	struct pci_dev *device = NULL;
	int mode;

	mode = bridge_agpstat & 0x7;
	if (agp_v3)
		mode *= 4;

	for_each_pci_dev(device) {
		u8 agp = pci_find_capability(device, PCI_CAP_ID_AGP);
		if (!agp)
			continue;

		printk(KERN_INFO PFX "Putting AGP V%d device at %s into %dx mode\n",
				agp_v3 ? 3 : 2, pci_name(device), mode);
		pci_write_config_dword(device, agp + PCI_AGP_COMMAND, bridge_agpstat);
	}
}
EXPORT_SYMBOL(agp_device_command);


void get_agp_version(struct agp_bridge_data *bridge)
{
	u32 ncapid;

	/* Exit early if already set by errata workarounds. */
	if (bridge->major_version != 0)
		return;

	pci_read_config_dword(bridge->dev, bridge->capndx, &ncapid);
	bridge->major_version = (ncapid >> AGP_MAJOR_VERSION_SHIFT) & 0xf;
	bridge->minor_version = (ncapid >> AGP_MINOR_VERSION_SHIFT) & 0xf;
}
EXPORT_SYMBOL(get_agp_version);


void agp_generic_enable(struct agp_bridge_data *bridge, u32 requested_mode)
{
	u32 bridge_agpstat, temp;

	get_agp_version(agp_bridge);

	printk(KERN_INFO PFX "Found an AGP %d.%d compliant device at %s.\n",
				agp_bridge->major_version,
				agp_bridge->minor_version,
				pci_name(agp_bridge->dev));

	pci_read_config_dword(agp_bridge->dev,
		      agp_bridge->capndx + PCI_AGP_STATUS, &bridge_agpstat);

	bridge_agpstat = agp_collect_device_status(agp_bridge, requested_mode, bridge_agpstat);
	if (bridge_agpstat == 0)
		/* Something bad happened. FIXME: Return error code? */
		return;

	bridge_agpstat |= AGPSTAT_AGP_ENABLE;

	/* Do AGP version specific frobbing. */
	if (bridge->major_version >= 3) {
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		if (bridge->mode & AGPSTAT_MODE_3_0) {
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			/* If we have 3.5, we can do the isoch stuff. */
			if (bridge->minor_version >= 5)
				agp_3_5_enable(bridge);
			agp_device_command(bridge_agpstat, TRUE);
			return;
		} else {
		    /* Disable calibration cycle in RX91<1> when not in AGP3.0 mode of operation.*/
		    bridge_agpstat &= ~(7<<10) ;
		    pci_read_config_dword(bridge->dev,
					bridge->capndx+AGPCTRL, &temp);
		    temp |= (1<<9);
		    pci_write_config_dword(bridge->dev,
					bridge->capndx+AGPCTRL, temp);

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		    printk(KERN_INFO PFX "Device is in legacy mode,"
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				" falling back to 2.x\n");
		}
	}

	/* AGP v<3 */
	agp_device_command(bridge_agpstat, FALSE);
}
EXPORT_SYMBOL(agp_generic_enable);


int agp_generic_create_gatt_table(struct agp_bridge_data *bridge)
{
	char *table;
	char *table_end;
	int size;
	int page_order;
	int num_entries;
	int i;
	void *temp;
	struct page *page;

	/* The generic routines can't handle 2 level gatt's */
	if (bridge->driver->size_type == LVL2_APER_SIZE)
		return -EINVAL;

	table = NULL;
	i = bridge->aperture_size_idx;
	temp = bridge->current_size;
	size = page_order = num_entries = 0;

	if (bridge->driver->size_type != FIXED_APER_SIZE) {
		do {
			switch (bridge->driver->size_type) {
			case U8_APER_SIZE:
				size = A_SIZE_8(temp)->size;
				page_order =
				    A_SIZE_8(temp)->page_order;
				num_entries =
				    A_SIZE_8(temp)->num_entries;
				break;
			case U16_APER_SIZE:
				size = A_SIZE_16(temp)->size;
				page_order = A_SIZE_16(temp)->page_order;
				num_entries = A_SIZE_16(temp)->num_entries;
				break;
			case U32_APER_SIZE:
				size = A_SIZE_32(temp)->size;
				page_order = A_SIZE_32(temp)->page_order;
				num_entries = A_SIZE_32(temp)->num_entries;
				break;
				/* This case will never really happen. */
			case FIXED_APER_SIZE:
			case LVL2_APER_SIZE:
			default:
				size = page_order = num_entries = 0;
				break;
			}

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			table = alloc_gatt_pages(page_order);
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			if (table == NULL) {
				i++;
				switch (bridge->driver->size_type) {
				case U8_APER_SIZE:
					bridge->current_size = A_IDX8(bridge);
					break;
				case U16_APER_SIZE:
					bridge->current_size = A_IDX16(bridge);
					break;
				case U32_APER_SIZE:
					bridge->current_size = A_IDX32(bridge);
					break;
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				/* These cases will never really happen. */
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				case FIXED_APER_SIZE:
				case LVL2_APER_SIZE:
				default:
					break;
				}
				temp = bridge->current_size;
			} else {
				bridge->aperture_size_idx = i;
			}
		} while (!table && (i < bridge->driver->num_aperture_sizes));
	} else {
		size = ((struct aper_size_info_fixed *) temp)->size;
		page_order = ((struct aper_size_info_fixed *) temp)->page_order;
		num_entries = ((struct aper_size_info_fixed *) temp)->num_entries;
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		table = alloc_gatt_pages(page_order);
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	}

	if (table == NULL)
		return -ENOMEM;

	table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);

	for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
		SetPageReserved(page);

	bridge->gatt_table_real = (u32 *) table;
	agp_gatt_table = (void *)table;

	bridge->driver->cache_flush();
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#ifdef CONFIG_X86
	set_memory_uc((unsigned long)table, 1 << page_order);
	bridge->gatt_table = (void *)table;
#else
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	bridge->gatt_table = ioremap_nocache(virt_to_gart(table),
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					(PAGE_SIZE * (1 << page_order)));
	bridge->driver->cache_flush();
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#endif
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	if (bridge->gatt_table == NULL) {
		for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
			ClearPageReserved(page);

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		free_gatt_pages(table, page_order);
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		return -ENOMEM;
	}
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	bridge->gatt_bus_addr = virt_to_gart(bridge->gatt_table_real);
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	/* AK: bogus, should encode addresses > 4GB */
	for (i = 0; i < num_entries; i++) {
		writel(bridge->scratch_page, bridge->gatt_table+i);
		readl(bridge->gatt_table+i);	/* PCI Posting. */
	}

	return 0;
}
EXPORT_SYMBOL(agp_generic_create_gatt_table);

int agp_generic_free_gatt_table(struct agp_bridge_data *bridge)
{
	int page_order;
	char *table, *table_end;
	void *temp;
	struct page *page;

	temp = bridge->current_size;

	switch (bridge->driver->size_type) {
	case U8_APER_SIZE:
		page_order = A_SIZE_8(temp)->page_order;
		break;
	case U16_APER_SIZE:
		page_order = A_SIZE_16(temp)->page_order;
		break;
	case U32_APER_SIZE:
		page_order = A_SIZE_32(temp)->page_order;
		break;
	case FIXED_APER_SIZE:
		page_order = A_SIZE_FIX(temp)->page_order;
		break;
	case LVL2_APER_SIZE:
		/* The generic routines can't deal with 2 level gatt's */
		return -EINVAL;
		break;
	default:
		page_order = 0;
		break;
	}

	/* Do not worry about freeing memory, because if this is
	 * called, then all agp memory is deallocated and removed
	 * from the table. */
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