/*
* AGPGART driver backend routines.
* Copyright (C) 2004 Silicon Graphics, Inc.
* Copyright (C) 2002-2003 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, DAVE JONES, 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/agpgart.h>
#include <linux/vmalloc.h>
#include <asm/io.h>
#include "agp.h"
/* Due to XFree86 brain-damage, we can't go to 1.0 until they
* fix some real stupidity. It's only by chance we can bump
* past 0.99 at all due to some boolean logic error. */
#define AGPGART_VERSION_MAJOR 0
#define AGPGART_VERSION_MINOR 101
static struct agp_version agp_current_version =
{
.major = AGPGART_VERSION_MAJOR,
.minor = AGPGART_VERSION_MINOR,
};
struct agp_bridge_data *(*agp_find_bridge)(struct pci_dev *) =
&agp_generic_find_bridge;
struct agp_bridge_data *agp_bridge;
LIST_HEAD(agp_bridges);
EXPORT_SYMBOL(agp_bridge);
EXPORT_SYMBOL(agp_bridges);
EXPORT_SYMBOL(agp_find_bridge);
/**
* agp_backend_acquire - attempt to acquire an agp backend.
*
*/
struct agp_bridge_data *agp_backend_acquire(struct pci_dev *pdev)
{
struct agp_bridge_data *bridge;
bridge = agp_find_bridge(pdev);
if (!bridge)
return NULL;
if (atomic_read(&bridge->agp_in_use))
return NULL;
atomic_inc(&bridge->agp_in_use);
return bridge;
}
EXPORT_SYMBOL(agp_backend_acquire);
/**
* agp_backend_release - release the lock on the agp backend.
*
* The caller must insure that the graphics aperture translation table
* is read for use by another entity.
*
* (Ensure that all memory it bound is unbound.)
*/
void agp_backend_release(struct agp_bridge_data *bridge)
{
if (bridge)
atomic_dec(&bridge->agp_in_use);
}
EXPORT_SYMBOL(agp_backend_release);
static struct { int mem, agp; } maxes_table[] = {
{0, 0},
{32, 4},
{64, 28},
{128, 96},
{256, 204},
{512, 440},
{1024, 942},
{2048, 1920},
{4096, 3932}
};
static int agp_find_max(void)
{
long memory, index, result;
#if PAGE_SHIFT < 20
memory = num_physpages >> (20 - PAGE_SHIFT);
#else
memory = num_physpages << (PAGE_SHIFT - 20);
#endif
index = 1;
while ((memory > maxes_table[index].mem) && (index < 8))
index++;
result = maxes_table[index - 1].agp +
( (memory - maxes_table[index - 1].mem) *
(maxes_table[index].agp - maxes_table[index - 1].agp)) /
(maxes_table[index].mem - maxes_table[index - 1].mem);
result = result << (20 - PAGE_SHIFT);
return result;
}
static int agp_backend_initialize(struct agp_bridge_data *bridge)
{
int size_value, rc, got_gatt=0, got_keylist=0;
bridge->max_memory_agp = agp_find_max();
bridge->version = &agp_current_version;
if (bridge->driver->needs_scratch_page) {
void *addr = bridge->driver->agp_alloc_page(bridge);
if (!addr) {
printk(KERN_ERR PFX "unable to get memory for scratch page.\n");
return -ENOMEM;
}
bridge->scratch_page_real = virt_to_phys(addr);
bridge->scratch_page =
bridge->driver->mask_memory(bridge, bridge->scratch_page_real, 0);
}
size_value = bridge->driver->fetch_size();
if (size_value == 0) {
printk(KERN_ERR PFX "unable to determine aperture size.\n");
rc = -EINVAL;
goto err_out;
}
if (bridge->driver->create_gatt_table(bridge)) {
printk(KERN_ERR PFX
"unable to get memory for graphics translation table.\n");
rc = -ENOMEM;
goto err_out;
}
got_gatt = 1;
bridge->key_list = vmalloc(PAGE_SIZE * 4);
if (bridge->key_list == NULL) {
printk(KERN_ERR PFX "error allocating memory for key lists.\n");
rc = -ENOMEM;
goto err_out;
}
got_keylist = 1;
/* FIXME vmalloc'd memory not guaranteed contiguous */
memset(bridge->key_list, 0, PAGE_SIZE * 4);
if (bridge->driver->configure()) {
printk(KERN_ERR PFX "error configuring host chipset.\n");
rc = -EINVAL;
goto err_out;
}
return 0;
err_out:
if (bridge->driver->needs_scratch_page)
bridge->driver->agp_destroy_page(
phys_to_virt(bridge->scratch_page_real));
if (got_gatt)
bridge->driver->free_gatt_table(bridge);
if (got_keylist) {
vfree(bridge->key_list);
bridge->key_list = NULL;
}
return rc;
}
/* cannot be __exit b/c as it could be called from __init code */
static void agp_backend_cleanup(struct agp_bridge_data *bridge)
{
if (bridge->driver->cleanup)
bridge->driver->cleanup();
if (bridge->driver->free_gatt_table)
bridge->driver->free_gatt_table(bridge);
if (bridge->key_list) {
vfree(bridge->key_list);
bridge->key_list = NULL;
}
if (bridge->driver->agp_destroy_page &&
bridge->driver->needs_scratch_page)
bridge->driver->agp_destroy_page(
phys_to_virt(bridge->scratch_page_real));
}
/* When we remove the global variable agp_bridge from all drivers
* then agp_alloc_bridge and agp_generic_find_bridge need to be updated
*/
struct agp_bridge_data *agp_alloc_bridge(void)
{
struct agp_bridge_data *bridge = kmalloc(sizeof(*bridge), GFP_KERNEL);
if (!bridge)
return NULL;
memset(bridge, 0, sizeof(*bridge));
atomic_set(&bridge->agp_in_use, 0);
atomic_set(&bridge->current_memory_agp, 0);
if (list_empty(&agp_bridges))
agp_bridge = bridge;
return bridge;
}
EXPORT_SYMBOL(agp_alloc_bridge);
void agp_put_bridge(struct agp_bridge_data *bridge)
{
kfree(bridge);
if (list_empty(&agp_bridges))
agp_bridge = NULL;
}
EXPORT_SYMBOL(agp_put_bridge);
int agp_add_bridge(struct agp_bridge_data *bridge)
{
int error;
if (agp_off)
return -ENODEV;
if (!bridge->dev) {
printk (KERN_DEBUG PFX "Erk, registering with no pci_dev!\n");
return -EINVAL;
}
/* Grab reference on the chipset driver. */
if (!try_module_get(bridge->driver->owner)) {
printk (KERN_INFO PFX "Couldn't lock chipset driver.\n");
return -EINVAL;
}
error = agp_backend_initialize(bridge);
if (error) {
printk (KERN_INFO PFX "agp_backend_initialize() failed.\n");
goto err_out;
}
if (list_empty(&agp_bridges)) {
error = agp_frontend_initialize();
if (error) {
printk (KERN_INFO PFX "agp_frontend_initialize() failed.\n");
goto frontend_err;
}
printk(KERN_INFO PFX "AGP aperture is %dM @ 0x%lx\n",
bridge->driver->fetch_size(), bridge->gart_bus_addr);
}
list_add(&bridge->list, &agp_bridges);
return 0;
frontend_err:
agp_backend_cleanup(bridge);
err_out:
module_put(bridge->driver->owner);
agp_put_bridge(bridge);
return error;
}
EXPORT_SYMBOL_GPL(agp_add_bridge);
void agp_remove_bridge(struct agp_bridge_data *bridge)
{
agp_backend_cleanup(bridge);
list_del(&bridge->list);
if (list_empty(&agp_bridges))
agp_frontend_cleanup();
module_put(bridge->driver->owner);
}
EXPORT_SYMBOL_GPL(agp_remove_bridge);
int agp_off;
int agp_try_unsupported_boot;
EXPORT_SYMBOL(agp_off);
EXPORT_SYMBOL(agp_try_unsupported_boot);
static int __init agp_init(void)
{
if (!agp_off)
printk(KERN_INFO "Linux agpgart interface v%d.%d (c) Dave Jones\n",
AGPGART_VERSION_MAJOR, AGPGART_VERSION_MINOR);
return 0;
}
static void __exit agp_exit(void)
{
}
#ifndef MODULE
static __init int agp_setup(char *s)
{
if (!strcmp(s,"off"))
agp_off = 1;
if (!strcmp(s,"try_unsupported"))
agp_try_unsupported_boot = 1;
return 1;
}
__setup("agp=", agp_setup);
#endif
MODULE_AUTHOR("Dave Jones <davej@codemonkey.org.uk>");
MODULE_DESCRIPTION("AGP GART driver");
MODULE_LICENSE("GPL and additional rights");
MODULE_ALIAS_MISCDEV(AGPGART_MINOR);
module_init(agp_init);
module_exit(agp_exit);
