drivers/char/agp/via-agp.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * VIA AGPGART routines.
  */

 #include <linux/types.h>
 #include <linux/module.h>
 #include <linux/pci.h>
 #include <linux/init.h>
 #include <linux/agp_backend.h>
 #include "agp.h"

 static const struct pci_device_id agp_via_pci_table[];

 #define VIA_GARTCTRL	0x80
 #define VIA_APSIZE	0x84
 #define VIA_ATTBASE	0x88

 #define VIA_AGP3_GARTCTRL	0x90
 #define VIA_AGP3_APSIZE		0x94
 #define VIA_AGP3_ATTBASE	0x98
 #define VIA_AGPSEL		0xfd

 static int via_fetch_size(void)
 {
 	int i;
 	u8 temp;
 	struct aper_size_info_8 *values;

 	values = A_SIZE_8(agp_bridge->driver->aperture_sizes);
 	pci_read_config_byte(agp_bridge->dev, VIA_APSIZE, &temp);
 	for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
 		if (temp == values[i].size_value) {
 			agp_bridge->previous_size =
 			    agp_bridge->current_size = (void *) (values + i);
 			agp_bridge->aperture_size_idx = i;
 			return values[i].size;
 		}
 	}
 	printk(KERN_ERR PFX "Unknown aperture size from AGP bridge (0x%x)\n", temp);
 	return 0;
 }


 static int via_configure(void)
 {
 	struct aper_size_info_8 *current_size;

 	current_size = A_SIZE_8(agp_bridge->current_size);
 	/* aperture size */
 	pci_write_config_byte(agp_bridge->dev, VIA_APSIZE,
 			      current_size->size_value);
 	/* address to map to */
 	agp_bridge->gart_bus_addr = pci_bus_address(agp_bridge->dev,
 						    AGP_APERTURE_BAR);

 	/* GART control register */
 	pci_write_config_dword(agp_bridge->dev, VIA_GARTCTRL, 0x0000000f);

 	/* attbase - aperture GATT base */
 	pci_write_config_dword(agp_bridge->dev, VIA_ATTBASE,
 			    (agp_bridge->gatt_bus_addr & 0xfffff000) | 3);
 	return 0;
 }


 static void via_cleanup(void)
 {
 	struct aper_size_info_8 *previous_size;

 	previous_size = A_SIZE_8(agp_bridge->previous_size);
 	pci_write_config_byte(agp_bridge->dev, VIA_APSIZE,
 			      previous_size->size_value);
 	/* Do not disable by writing 0 to VIA_ATTBASE, it screws things up
 	 * during reinitialization.
 	 */
 }


 static void via_tlbflush(struct agp_memory *mem)
 {
 	u32 temp;

 	pci_read_config_dword(agp_bridge->dev, VIA_GARTCTRL, &temp);
 	temp |= (1<<7);
 	pci_write_config_dword(agp_bridge->dev, VIA_GARTCTRL, temp);
 	temp &= ~(1<<7);
 	pci_write_config_dword(agp_bridge->dev, VIA_GARTCTRL, temp);
 }


 static const struct aper_size_info_8 via_generic_sizes[9] =
 {
 	{256, 65536, 6, 0},
 	{128, 32768, 5, 128},
 	{64, 16384, 4, 192},
 	{32, 8192, 3, 224},
 	{16, 4096, 2, 240},
 	{8, 2048, 1, 248},
 	{4, 1024, 0, 252},
 	{2, 512, 0, 254},
 	{1, 256, 0, 255}
 };


 static int via_fetch_size_agp3(void)
 {
 	int i;
 	u16 temp;
 	struct aper_size_info_16 *values;

 	values = A_SIZE_16(agp_bridge->driver->aperture_sizes);
 	pci_read_config_word(agp_bridge->dev, VIA_AGP3_APSIZE, &temp);
 	temp &= 0xfff;

 	for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
 		if (temp == values[i].size_value) {
 			agp_bridge->previous_size =
 				agp_bridge->current_size = (void *) (values + i);
 			agp_bridge->aperture_size_idx = i;
 			return values[i].size;
 		}
 	}
 	return 0;
 }


 static int via_configure_agp3(void)
 {
 	u32 temp;

 	/* address to map to */
 	agp_bridge->gart_bus_addr = pci_bus_address(agp_bridge->dev,
 						    AGP_APERTURE_BAR);

 	/* attbase - aperture GATT base */
 	pci_write_config_dword(agp_bridge->dev, VIA_AGP3_ATTBASE,
 		agp_bridge->gatt_bus_addr & 0xfffff000);

 	/* 1. Enable GTLB in RX90<7>, all AGP aperture access needs to fetch
 	 *    translation table first.
 	 * 2. Enable AGP aperture in RX91<0>. This bit controls the enabling of the
 	 *    graphics AGP aperture for the AGP3.0 port.
 	 */
 	pci_read_config_dword(agp_bridge->dev, VIA_AGP3_GARTCTRL, &temp);
 	pci_write_config_dword(agp_bridge->dev, VIA_AGP3_GARTCTRL, temp | (3<<7));
 	return 0;
 }


 static void via_cleanup_agp3(void)
 {
 	struct aper_size_info_16 *previous_size;

 	previous_size = A_SIZE_16(agp_bridge->previous_size);
 	pci_write_config_byte(agp_bridge->dev, VIA_APSIZE, previous_size->size_value);
 }


 static void via_tlbflush_agp3(struct agp_memory *mem)
 {
 	u32 temp;

 	pci_read_config_dword(agp_bridge->dev, VIA_AGP3_GARTCTRL, &temp);
 	pci_write_config_dword(agp_bridge->dev, VIA_AGP3_GARTCTRL, temp & ~(1<<7));
 	pci_write_config_dword(agp_bridge->dev, VIA_AGP3_GARTCTRL, temp);
 }


 static const struct agp_bridge_driver via_agp3_driver = {
 	.owner			= THIS_MODULE,
 	.aperture_sizes		= agp3_generic_sizes,
 	.size_type		= U8_APER_SIZE,
 	.num_aperture_sizes	= 10,
 	.needs_scratch_page	= true,
 	.configure		= via_configure_agp3,
 	.fetch_size		= via_fetch_size_agp3,
 	.cleanup		= via_cleanup_agp3,
 	.tlb_flush		= via_tlbflush_agp3,
 	.mask_memory		= agp_generic_mask_memory,
 	.masks			= NULL,
 	.agp_enable		= agp_generic_enable,
 	.cache_flush		= global_cache_flush,
 	.create_gatt_table	= agp_generic_create_gatt_table,
 	.free_gatt_table	= agp_generic_free_gatt_table,
 	.insert_memory		= agp_generic_insert_memory,
 	.remove_memory		= agp_generic_remove_memory,
 	.alloc_by_type		= agp_generic_alloc_by_type,
 	.free_by_type		= agp_generic_free_by_type,
 	.agp_alloc_page		= agp_generic_alloc_page,
 	.agp_alloc_pages	= agp_generic_alloc_pages,
 	.agp_destroy_page	= agp_generic_destroy_page,
 	.agp_destroy_pages	= agp_generic_destroy_pages,
 	.agp_type_to_mask_type  = agp_generic_type_to_mask_type,
 };

 static const struct agp_bridge_driver via_driver = {
 	.owner			= THIS_MODULE,
 	.aperture_sizes		= via_generic_sizes,
 	.size_type		= U8_APER_SIZE,
 	.num_aperture_sizes	= 9,
 	.needs_scratch_page	= true,
 	.configure		= via_configure,
 	.fetch_size		= via_fetch_size,
 	.cleanup		= via_cleanup,
 	.tlb_flush		= via_tlbflush,
 	.mask_memory		= agp_generic_mask_memory,
 	.masks			= NULL,
 	.agp_enable		= agp_generic_enable,
 	.cache_flush		= global_cache_flush,
 	.create_gatt_table	= agp_generic_create_gatt_table,
 	.free_gatt_table	= agp_generic_free_gatt_table,
 	.insert_memory		= agp_generic_insert_memory,
 	.remove_memory		= agp_generic_remove_memory,
 	.alloc_by_type		= agp_generic_alloc_by_type,
 	.free_by_type		= agp_generic_free_by_type,
 	.agp_alloc_page		= agp_generic_alloc_page,
 	.agp_alloc_pages	= agp_generic_alloc_pages,
 	.agp_destroy_page	= agp_generic_destroy_page,
 	.agp_destroy_pages	= agp_generic_destroy_pages,
 	.agp_type_to_mask_type  = agp_generic_type_to_mask_type,
 };

 static struct agp_device_ids via_agp_device_ids[] =
 {
 	{
 		.device_id	= PCI_DEVICE_ID_VIA_82C597_0,
 		.chipset_name	= "Apollo VP3",
 	},

 	{
 		.device_id	= PCI_DEVICE_ID_VIA_82C598_0,
 		.chipset_name	= "Apollo MVP3",
 	},

 	{
 		.device_id	= PCI_DEVICE_ID_VIA_8501_0,
 		.chipset_name	= "Apollo MVP4",
 	},

 	/* VT8601 */
 	{
 		.device_id	= PCI_DEVICE_ID_VIA_8601_0,
 		.chipset_name	= "Apollo ProMedia/PLE133Ta",
 	},

 	/* VT82C693A / VT28C694T */
 	{
 		.device_id	= PCI_DEVICE_ID_VIA_82C691_0,
 		.chipset_name	= "Apollo Pro 133",
 	},

 	{
 		.device_id	= PCI_DEVICE_ID_VIA_8371_0,
 		.chipset_name	= "KX133",
 	},

 	/* VT8633 */
 	{
 		.device_id	= PCI_DEVICE_ID_VIA_8633_0,
 		.chipset_name	= "Pro 266",
 	},

 	{
 		.device_id	= PCI_DEVICE_ID_VIA_XN266,
 		.chipset_name	= "Apollo Pro266",
 	},

 	/* VT8361 */
 	{
 		.device_id	= PCI_DEVICE_ID_VIA_8361,
 		.chipset_name	= "KLE133",
 	},

 	/* VT8365 / VT8362 */
 	{
 		.device_id	= PCI_DEVICE_ID_VIA_8363_0,
 		.chipset_name	= "Twister-K/KT133x/KM133",
 	},

 	/* VT8753A */
 	{
 		.device_id	= PCI_DEVICE_ID_VIA_8753_0,
 		.chipset_name	= "P4X266",
 	},

 	/* VT8366 */
 	{
 		.device_id	= PCI_DEVICE_ID_VIA_8367_0,
 		.chipset_name	= "KT266/KY266x/KT333",
 	},

 	/* VT8633 (for CuMine/ Celeron) */
 	{
 		.device_id	= PCI_DEVICE_ID_VIA_8653_0,
 		.chipset_name	= "Pro266T",
 	},

 	/* KM266 / PM266 */
 	{
 		.device_id	= PCI_DEVICE_ID_VIA_XM266,
 		.chipset_name	= "PM266/KM266",
 	},

 	/* CLE266 */
 	{
 		.device_id	= PCI_DEVICE_ID_VIA_862X_0,
 		.chipset_name	= "CLE266",
 	},

 	{
 		.device_id	= PCI_DEVICE_ID_VIA_8377_0,
 		.chipset_name	= "KT400/KT400A/KT600",
 	},

 	/* VT8604 / VT8605 / VT8603
 	 * (Apollo Pro133A chipset with S3 Savage4) */
 	{
 		.device_id	= PCI_DEVICE_ID_VIA_8605_0,
 		.chipset_name	= "ProSavage PM133/PL133/PN133"
 	},

 	/* P4M266x/P4N266 */
 	{
 		.device_id	= PCI_DEVICE_ID_VIA_8703_51_0,
 		.chipset_name	= "P4M266x/P4N266",
 	},

 	/* VT8754 */
 	{
 		.device_id	= PCI_DEVICE_ID_VIA_8754C_0,
 		.chipset_name	= "PT800",
 	},

 	/* P4X600 */
 	{
 		.device_id	= PCI_DEVICE_ID_VIA_8763_0,
 		.chipset_name	= "P4X600"
 	},

 	/* KM400 */
 	{
 		.device_id	= PCI_DEVICE_ID_VIA_8378_0,
 		.chipset_name	= "KM400/KM400A",
 	},

 	/* PT880 */
 	{
 		.device_id	= PCI_DEVICE_ID_VIA_PT880,
 		.chipset_name	= "PT880",
 	},

 	/* PT880 Ultra */
 	{
 		.device_id	= PCI_DEVICE_ID_VIA_PT880ULTRA,
 		.chipset_name	= "PT880 Ultra",
 	},

 	/* PT890 */
 	{
 		.device_id	= PCI_DEVICE_ID_VIA_8783_0,
 		.chipset_name	= "PT890",
 	},

 	/* PM800/PN800/PM880/PN880 */
 	{
 		.device_id	= PCI_DEVICE_ID_VIA_PX8X0_0,
 		.chipset_name	= "PM800/PN800/PM880/PN880",
 	},
 	/* KT880 */
 	{
 		.device_id	= PCI_DEVICE_ID_VIA_3269_0,
 		.chipset_name	= "KT880",
 	},
 	/* KTxxx/Px8xx */
 	{
 		.device_id	= PCI_DEVICE_ID_VIA_83_87XX_1,
 		.chipset_name	= "VT83xx/VT87xx/KTxxx/Px8xx",
 	},
 	/* P4M800 */
 	{
 		.device_id	= PCI_DEVICE_ID_VIA_3296_0,
 		.chipset_name	= "P4M800",
 	},
 	/* P4M800CE */
 	{
 		.device_id	= PCI_DEVICE_ID_VIA_P4M800CE,
 		.chipset_name	= "VT3314",
 	},
 	/* VT3324 / CX700 */
 	{
 		.device_id  = PCI_DEVICE_ID_VIA_VT3324,
 		.chipset_name   = "CX700",
 	},
 	/* VT3336 - this is a chipset for AMD Athlon/K8 CPU. Due to K8's unique
 	 * architecture, the AGP resource and behavior are different from
 	 * the traditional AGP which resides only in chipset. AGP is used
 	 * by 3D driver which wasn't available for the VT3336 and VT3364
 	 * generation until now.  Unfortunately, by testing, VT3364 works
 	 * but VT3336 doesn't. - explanation from via, just leave this as
 	 * as a placeholder to avoid future patches adding it back in.
 	 */
 #if 0
 	{
 		.device_id  = PCI_DEVICE_ID_VIA_VT3336,
 		.chipset_name   = "VT3336",
 	},
 #endif
 	/* P4M890 */
 	{
 		.device_id  = PCI_DEVICE_ID_VIA_P4M890,
 		.chipset_name   = "P4M890",
 	},
 	/* P4M900 */
 	{
 		.device_id  = PCI_DEVICE_ID_VIA_VT3364,
 		.chipset_name   = "P4M900",
 	},
 	{ }, /* dummy final entry, always present */
 };


 /*
  * VIA's AGP3 chipsets do magick to put the AGP bridge compliant
  * with the same standards version as the graphics card.
  */
 static void check_via_agp3 (struct agp_bridge_data *bridge)
 {
 	u8 reg;

 	pci_read_config_byte(bridge->dev, VIA_AGPSEL, &reg);
 	/* Check AGP 2.0 compatibility mode. */
 	if ((reg & (1<<1))==0)
 		bridge->driver = &via_agp3_driver;
 }


 static int agp_via_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 {
 	struct agp_device_ids *devs = via_agp_device_ids;
 	struct agp_bridge_data *bridge;
 	int j = 0;
 	u8 cap_ptr;

 	cap_ptr = pci_find_capability(pdev, PCI_CAP_ID_AGP);
 	if (!cap_ptr)
 		return -ENODEV;

 	j = ent - agp_via_pci_table;
 	printk (KERN_INFO PFX "Detected VIA %s chipset\n", devs[j].chipset_name);

 	bridge = agp_alloc_bridge();
 	if (!bridge)
 		return -ENOMEM;

 	bridge->dev = pdev;
 	bridge->capndx = cap_ptr;
 	bridge->driver = &via_driver;

 	/*
 	 * Garg, there are KT400s with KT266 IDs.
 	 */
 	if (pdev->device == PCI_DEVICE_ID_VIA_8367_0) {
 		/* Is there a KT400 subsystem ? */
 		if (pdev->subsystem_device == PCI_DEVICE_ID_VIA_8377_0) {
 			printk(KERN_INFO PFX "Found KT400 in disguise as a KT266.\n");
 			check_via_agp3(bridge);
 		}
 	}

 	/* If this is an AGP3 bridge, check which mode its in and adjust. */
 	get_agp_version(bridge);
 	if (bridge->major_version >= 3)
 		check_via_agp3(bridge);

 	/* Fill in the mode register */
 	pci_read_config_dword(pdev,
 			bridge->capndx+PCI_AGP_STATUS, &bridge->mode);

 	pci_set_drvdata(pdev, bridge);
 	return agp_add_bridge(bridge);
 }

 static void agp_via_remove(struct pci_dev *pdev)
 {
 	struct agp_bridge_data *bridge = pci_get_drvdata(pdev);

 	agp_remove_bridge(bridge);
 	agp_put_bridge(bridge);
 }

 static int agp_via_resume(struct device *dev)
 {
 	struct agp_bridge_data *bridge = dev_get_drvdata(dev);

 	if (bridge->driver == &via_agp3_driver)
 		return via_configure_agp3();
 	else if (bridge->driver == &via_driver)
 		return via_configure();

 	return 0;
 }

 /* must be the same order as name table above */
 static const struct pci_device_id agp_via_pci_table[] = {
 #define ID(x) \
 	{						\
 	.class		= (PCI_CLASS_BRIDGE_HOST << 8),	\
 	.class_mask	= ~0,				\
 	.vendor		= PCI_VENDOR_ID_VIA,		\
 	.device		= x,				\
 	.subvendor	= PCI_ANY_ID,			\
 	.subdevice	= PCI_ANY_ID,			\
 	}
 	ID(PCI_DEVICE_ID_VIA_82C597_0),
 	ID(PCI_DEVICE_ID_VIA_82C598_0),
 	ID(PCI_DEVICE_ID_VIA_8501_0),
 	ID(PCI_DEVICE_ID_VIA_8601_0),
 	ID(PCI_DEVICE_ID_VIA_82C691_0),
 	ID(PCI_DEVICE_ID_VIA_8371_0),
 	ID(PCI_DEVICE_ID_VIA_8633_0),
 	ID(PCI_DEVICE_ID_VIA_XN266),
 	ID(PCI_DEVICE_ID_VIA_8361),
 	ID(PCI_DEVICE_ID_VIA_8363_0),
 	ID(PCI_DEVICE_ID_VIA_8753_0),
 	ID(PCI_DEVICE_ID_VIA_8367_0),
 	ID(PCI_DEVICE_ID_VIA_8653_0),
 	ID(PCI_DEVICE_ID_VIA_XM266),
 	ID(PCI_DEVICE_ID_VIA_862X_0),
 	ID(PCI_DEVICE_ID_VIA_8377_0),
 	ID(PCI_DEVICE_ID_VIA_8605_0),
 	ID(PCI_DEVICE_ID_VIA_8703_51_0),
 	ID(PCI_DEVICE_ID_VIA_8754C_0),
 	ID(PCI_DEVICE_ID_VIA_8763_0),
 	ID(PCI_DEVICE_ID_VIA_8378_0),
 	ID(PCI_DEVICE_ID_VIA_PT880),
 	ID(PCI_DEVICE_ID_VIA_PT880ULTRA),
 	ID(PCI_DEVICE_ID_VIA_8783_0),
 	ID(PCI_DEVICE_ID_VIA_PX8X0_0),
 	ID(PCI_DEVICE_ID_VIA_3269_0),
 	ID(PCI_DEVICE_ID_VIA_83_87XX_1),
 	ID(PCI_DEVICE_ID_VIA_3296_0),
 	ID(PCI_DEVICE_ID_VIA_P4M800CE),
 	ID(PCI_DEVICE_ID_VIA_VT3324),
 	ID(PCI_DEVICE_ID_VIA_P4M890),
 	ID(PCI_DEVICE_ID_VIA_VT3364),
 	{ }
 };

 MODULE_DEVICE_TABLE(pci, agp_via_pci_table);

 static DEFINE_SIMPLE_DEV_PM_OPS(agp_via_pm_ops, NULL, agp_via_resume);

 static struct pci_driver agp_via_pci_driver = {
 	.name		= "agpgart-via",
 	.id_table	= agp_via_pci_table,
 	.probe		= agp_via_probe,
 	.remove		= agp_via_remove,
 	.driver.pm      = &agp_via_pm_ops,
 };


 static int __init agp_via_init(void)
 {
 	if (agp_off)
 		return -EINVAL;
 	return pci_register_driver(&agp_via_pci_driver);
 }

 static void __exit agp_via_cleanup(void)
 {
 	pci_unregister_driver(&agp_via_pci_driver);
 }

 module_init(agp_via_init);
 module_exit(agp_via_cleanup);

 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Dave Jones");
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* VIA AGPGART routines.
	*/

	#include <linux/types.h>
	#include <linux/module.h>
	#include <linux/pci.h>
	#include <linux/init.h>
	#include <linux/agp_backend.h>
	#include "agp.h"

	static const struct pci_device_id agp_via_pci_table[];

	#define VIA_GARTCTRL 0x80
	#define VIA_APSIZE 0x84
	#define VIA_ATTBASE 0x88

	#define VIA_AGP3_GARTCTRL 0x90
	#define VIA_AGP3_APSIZE 0x94
	#define VIA_AGP3_ATTBASE 0x98
	#define VIA_AGPSEL 0xfd

	static int via_fetch_size(void)
	{
	int i;
	u8 temp;
	struct aper_size_info_8 *values;

	values = A_SIZE_8(agp_bridge->driver->aperture_sizes);
	pci_read_config_byte(agp_bridge->dev, VIA_APSIZE, &temp);
	for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
	if (temp == values[i].size_value) {
	agp_bridge->previous_size =
	agp_bridge->current_size = (void *) (values + i);
	agp_bridge->aperture_size_idx = i;
	return values[i].size;
	}
	}
	printk(KERN_ERR PFX "Unknown aperture size from AGP bridge (0x%x)\n", temp);
	return 0;
	}


	static int via_configure(void)
	{
	struct aper_size_info_8 *current_size;

	current_size = A_SIZE_8(agp_bridge->current_size);
	/* aperture size */
	pci_write_config_byte(agp_bridge->dev, VIA_APSIZE,
	current_size->size_value);
	/* address to map to */
	agp_bridge->gart_bus_addr = pci_bus_address(agp_bridge->dev,
	AGP_APERTURE_BAR);

	/* GART control register */
	pci_write_config_dword(agp_bridge->dev, VIA_GARTCTRL, 0x0000000f);

	/* attbase - aperture GATT base */
	pci_write_config_dword(agp_bridge->dev, VIA_ATTBASE,
	(agp_bridge->gatt_bus_addr & 0xfffff000) \| 3);
	return 0;
	}


	static void via_cleanup(void)
	{
	struct aper_size_info_8 *previous_size;

	previous_size = A_SIZE_8(agp_bridge->previous_size);
	pci_write_config_byte(agp_bridge->dev, VIA_APSIZE,
	previous_size->size_value);
	/* Do not disable by writing 0 to VIA_ATTBASE, it screws things up
	* during reinitialization.
	*/
	}


	static void via_tlbflush(struct agp_memory *mem)
	{
	u32 temp;

	pci_read_config_dword(agp_bridge->dev, VIA_GARTCTRL, &temp);
	temp \|= (1<<7);
	pci_write_config_dword(agp_bridge->dev, VIA_GARTCTRL, temp);
	temp &= ~(1<<7);
	pci_write_config_dword(agp_bridge->dev, VIA_GARTCTRL, temp);
	}


	static const struct aper_size_info_8 via_generic_sizes[9] =
	{
	{256, 65536, 6, 0},
	{128, 32768, 5, 128},
	{64, 16384, 4, 192},
	{32, 8192, 3, 224},
	{16, 4096, 2, 240},
	{8, 2048, 1, 248},
	{4, 1024, 0, 252},
	{2, 512, 0, 254},
	{1, 256, 0, 255}
	};


	static int via_fetch_size_agp3(void)
	{
	int i;
	u16 temp;
	struct aper_size_info_16 *values;

	values = A_SIZE_16(agp_bridge->driver->aperture_sizes);
	pci_read_config_word(agp_bridge->dev, VIA_AGP3_APSIZE, &temp);
	temp &= 0xfff;

	for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
	if (temp == values[i].size_value) {
	agp_bridge->previous_size =
	agp_bridge->current_size = (void *) (values + i);
	agp_bridge->aperture_size_idx = i;
	return values[i].size;
	}
	}
	return 0;
	}


	static int via_configure_agp3(void)
	{
	u32 temp;

	/* address to map to */
	agp_bridge->gart_bus_addr = pci_bus_address(agp_bridge->dev,
	AGP_APERTURE_BAR);

	/* attbase - aperture GATT base */
	pci_write_config_dword(agp_bridge->dev, VIA_AGP3_ATTBASE,
	agp_bridge->gatt_bus_addr & 0xfffff000);

	/* 1. Enable GTLB in RX90<7>, all AGP aperture access needs to fetch
	* translation table first.
	* 2. Enable AGP aperture in RX91<0>. This bit controls the enabling of the
	* graphics AGP aperture for the AGP3.0 port.
	*/
	pci_read_config_dword(agp_bridge->dev, VIA_AGP3_GARTCTRL, &temp);
	pci_write_config_dword(agp_bridge->dev, VIA_AGP3_GARTCTRL, temp \| (3<<7));
	return 0;
	}


	static void via_cleanup_agp3(void)
	{
	struct aper_size_info_16 *previous_size;

	previous_size = A_SIZE_16(agp_bridge->previous_size);
	pci_write_config_byte(agp_bridge->dev, VIA_APSIZE, previous_size->size_value);
	}


	static void via_tlbflush_agp3(struct agp_memory *mem)
	{
	u32 temp;

	pci_read_config_dword(agp_bridge->dev, VIA_AGP3_GARTCTRL, &temp);
	pci_write_config_dword(agp_bridge->dev, VIA_AGP3_GARTCTRL, temp & ~(1<<7));
	pci_write_config_dword(agp_bridge->dev, VIA_AGP3_GARTCTRL, temp);
	}


	static const struct agp_bridge_driver via_agp3_driver = {
	.owner = THIS_MODULE,
	.aperture_sizes = agp3_generic_sizes,
	.size_type = U8_APER_SIZE,
	.num_aperture_sizes = 10,
	.needs_scratch_page = true,
	.configure = via_configure_agp3,
	.fetch_size = via_fetch_size_agp3,
	.cleanup = via_cleanup_agp3,
	.tlb_flush = via_tlbflush_agp3,
	.mask_memory = agp_generic_mask_memory,
	.masks = NULL,
	.agp_enable = agp_generic_enable,
	.cache_flush = global_cache_flush,
	.create_gatt_table = agp_generic_create_gatt_table,
	.free_gatt_table = agp_generic_free_gatt_table,
	.insert_memory = agp_generic_insert_memory,
	.remove_memory = agp_generic_remove_memory,
	.alloc_by_type = agp_generic_alloc_by_type,
	.free_by_type = agp_generic_free_by_type,
	.agp_alloc_page = agp_generic_alloc_page,
	.agp_alloc_pages = agp_generic_alloc_pages,
	.agp_destroy_page = agp_generic_destroy_page,
	.agp_destroy_pages = agp_generic_destroy_pages,
	.agp_type_to_mask_type = agp_generic_type_to_mask_type,
	};

	static const struct agp_bridge_driver via_driver = {
	.owner = THIS_MODULE,
	.aperture_sizes = via_generic_sizes,
	.size_type = U8_APER_SIZE,
	.num_aperture_sizes = 9,
	.needs_scratch_page = true,
	.configure = via_configure,
	.fetch_size = via_fetch_size,
	.cleanup = via_cleanup,
	.tlb_flush = via_tlbflush,
	.mask_memory = agp_generic_mask_memory,
	.masks = NULL,
	.agp_enable = agp_generic_enable,
	.cache_flush = global_cache_flush,
	.create_gatt_table = agp_generic_create_gatt_table,
	.free_gatt_table = agp_generic_free_gatt_table,
	.insert_memory = agp_generic_insert_memory,
	.remove_memory = agp_generic_remove_memory,
	.alloc_by_type = agp_generic_alloc_by_type,
	.free_by_type = agp_generic_free_by_type,
	.agp_alloc_page = agp_generic_alloc_page,
	.agp_alloc_pages = agp_generic_alloc_pages,
	.agp_destroy_page = agp_generic_destroy_page,
	.agp_destroy_pages = agp_generic_destroy_pages,
	.agp_type_to_mask_type = agp_generic_type_to_mask_type,
	};

	static struct agp_device_ids via_agp_device_ids[] =
	{
	{
	.device_id = PCI_DEVICE_ID_VIA_82C597_0,
	.chipset_name = "Apollo VP3",
	},

	{
	.device_id = PCI_DEVICE_ID_VIA_82C598_0,
	.chipset_name = "Apollo MVP3",
	},

	{
	.device_id = PCI_DEVICE_ID_VIA_8501_0,
	.chipset_name = "Apollo MVP4",
	},

	/* VT8601 */
	{
	.device_id = PCI_DEVICE_ID_VIA_8601_0,
	.chipset_name = "Apollo ProMedia/PLE133Ta",
	},

	/* VT82C693A / VT28C694T */
	{
	.device_id = PCI_DEVICE_ID_VIA_82C691_0,
	.chipset_name = "Apollo Pro 133",
	},

	{
	.device_id = PCI_DEVICE_ID_VIA_8371_0,
	.chipset_name = "KX133",
	},

	/* VT8633 */
	{
	.device_id = PCI_DEVICE_ID_VIA_8633_0,
	.chipset_name = "Pro 266",
	},

	{
	.device_id = PCI_DEVICE_ID_VIA_XN266,
	.chipset_name = "Apollo Pro266",
	},

	/* VT8361 */
	{
	.device_id = PCI_DEVICE_ID_VIA_8361,
	.chipset_name = "KLE133",
	},

	/* VT8365 / VT8362 */
	{
	.device_id = PCI_DEVICE_ID_VIA_8363_0,
	.chipset_name = "Twister-K/KT133x/KM133",
	},

	/* VT8753A */
	{
	.device_id = PCI_DEVICE_ID_VIA_8753_0,
	.chipset_name = "P4X266",
	},

	/* VT8366 */
	{
	.device_id = PCI_DEVICE_ID_VIA_8367_0,
	.chipset_name = "KT266/KY266x/KT333",
	},

	/* VT8633 (for CuMine/ Celeron) */
	{
	.device_id = PCI_DEVICE_ID_VIA_8653_0,
	.chipset_name = "Pro266T",
	},

	/* KM266 / PM266 */
	{
	.device_id = PCI_DEVICE_ID_VIA_XM266,
	.chipset_name = "PM266/KM266",
	},

	/* CLE266 */
	{
	.device_id = PCI_DEVICE_ID_VIA_862X_0,
	.chipset_name = "CLE266",
	},

	{
	.device_id = PCI_DEVICE_ID_VIA_8377_0,
	.chipset_name = "KT400/KT400A/KT600",
	},

	/* VT8604 / VT8605 / VT8603
	* (Apollo Pro133A chipset with S3 Savage4) */
	{
	.device_id = PCI_DEVICE_ID_VIA_8605_0,
	.chipset_name = "ProSavage PM133/PL133/PN133"
	},

	/* P4M266x/P4N266 */
	{
	.device_id = PCI_DEVICE_ID_VIA_8703_51_0,
	.chipset_name = "P4M266x/P4N266",
	},

	/* VT8754 */
	{
	.device_id = PCI_DEVICE_ID_VIA_8754C_0,
	.chipset_name = "PT800",
	},

	/* P4X600 */
	{
	.device_id = PCI_DEVICE_ID_VIA_8763_0,
	.chipset_name = "P4X600"
	},

	/* KM400 */
	{
	.device_id = PCI_DEVICE_ID_VIA_8378_0,
	.chipset_name = "KM400/KM400A",
	},

	/* PT880 */
	{
	.device_id = PCI_DEVICE_ID_VIA_PT880,
	.chipset_name = "PT880",
	},

	/* PT880 Ultra */
	{
	.device_id = PCI_DEVICE_ID_VIA_PT880ULTRA,
	.chipset_name = "PT880 Ultra",
	},

	/* PT890 */
	{
	.device_id = PCI_DEVICE_ID_VIA_8783_0,
	.chipset_name = "PT890",
	},

	/* PM800/PN800/PM880/PN880 */
	{
	.device_id = PCI_DEVICE_ID_VIA_PX8X0_0,
	.chipset_name = "PM800/PN800/PM880/PN880",
	},
	/* KT880 */
	{
	.device_id = PCI_DEVICE_ID_VIA_3269_0,
	.chipset_name = "KT880",
	},
	/* KTxxx/Px8xx */
	{
	.device_id = PCI_DEVICE_ID_VIA_83_87XX_1,
	.chipset_name = "VT83xx/VT87xx/KTxxx/Px8xx",
	},
	/* P4M800 */
	{
	.device_id = PCI_DEVICE_ID_VIA_3296_0,
	.chipset_name = "P4M800",
	},
	/* P4M800CE */
	{
	.device_id = PCI_DEVICE_ID_VIA_P4M800CE,
	.chipset_name = "VT3314",
	},
	/* VT3324 / CX700 */
	{
	.device_id = PCI_DEVICE_ID_VIA_VT3324,
	.chipset_name = "CX700",
	},
	/* VT3336 - this is a chipset for AMD Athlon/K8 CPU. Due to K8's unique
	* architecture, the AGP resource and behavior are different from
	* the traditional AGP which resides only in chipset. AGP is used
	* by 3D driver which wasn't available for the VT3336 and VT3364
	* generation until now. Unfortunately, by testing, VT3364 works
	* but VT3336 doesn't. - explanation from via, just leave this as
	* as a placeholder to avoid future patches adding it back in.
	*/
	#if 0
	{
	.device_id = PCI_DEVICE_ID_VIA_VT3336,
	.chipset_name = "VT3336",
	},
	#endif
	/* P4M890 */
	{
	.device_id = PCI_DEVICE_ID_VIA_P4M890,
	.chipset_name = "P4M890",
	},
	/* P4M900 */
	{
	.device_id = PCI_DEVICE_ID_VIA_VT3364,
	.chipset_name = "P4M900",
	},
	{ }, /* dummy final entry, always present */
	};


	/*
	* VIA's AGP3 chipsets do magick to put the AGP bridge compliant
	* with the same standards version as the graphics card.
	*/
	static void check_via_agp3 (struct agp_bridge_data *bridge)
	{
	u8 reg;

	pci_read_config_byte(bridge->dev, VIA_AGPSEL, &reg);
	/* Check AGP 2.0 compatibility mode. */
	if ((reg & (1<<1))==0)
	bridge->driver = &via_agp3_driver;
	}


	static int agp_via_probe(struct pci_dev pdev, const struct pci_device_id ent)
	{
	struct agp_device_ids *devs = via_agp_device_ids;
	struct agp_bridge_data *bridge;
	int j = 0;
	u8 cap_ptr;

	cap_ptr = pci_find_capability(pdev, PCI_CAP_ID_AGP);
	if (!cap_ptr)
	return -ENODEV;

	j = ent - agp_via_pci_table;
	printk (KERN_INFO PFX "Detected VIA %s chipset\n", devs[j].chipset_name);

	bridge = agp_alloc_bridge();
	if (!bridge)
	return -ENOMEM;

	bridge->dev = pdev;
	bridge->capndx = cap_ptr;
	bridge->driver = &via_driver;

	/*
	* Garg, there are KT400s with KT266 IDs.
	*/
	if (pdev->device == PCI_DEVICE_ID_VIA_8367_0) {
	/* Is there a KT400 subsystem ? */
	if (pdev->subsystem_device == PCI_DEVICE_ID_VIA_8377_0) {
	printk(KERN_INFO PFX "Found KT400 in disguise as a KT266.\n");
	check_via_agp3(bridge);
	}
	}

	/* If this is an AGP3 bridge, check which mode its in and adjust. */
	get_agp_version(bridge);
	if (bridge->major_version >= 3)
	check_via_agp3(bridge);

	/* Fill in the mode register */
	pci_read_config_dword(pdev,
	bridge->capndx+PCI_AGP_STATUS, &bridge->mode);

	pci_set_drvdata(pdev, bridge);
	return agp_add_bridge(bridge);
	}

	static void agp_via_remove(struct pci_dev *pdev)
	{
	struct agp_bridge_data *bridge = pci_get_drvdata(pdev);

	agp_remove_bridge(bridge);
	agp_put_bridge(bridge);
	}

	static int agp_via_resume(struct device *dev)
	{
	struct agp_bridge_data *bridge = dev_get_drvdata(dev);

	if (bridge->driver == &via_agp3_driver)
	return via_configure_agp3();
	else if (bridge->driver == &via_driver)
	return via_configure();

	return 0;
	}

	/* must be the same order as name table above */
	static const struct pci_device_id agp_via_pci_table[] = {
	#define ID(x) \
	{ \
	.class = (PCI_CLASS_BRIDGE_HOST << 8), \
	.class_mask = ~0, \
	.vendor = PCI_VENDOR_ID_VIA, \
	.device = x, \
	.subvendor = PCI_ANY_ID, \
	.subdevice = PCI_ANY_ID, \
	}
	ID(PCI_DEVICE_ID_VIA_82C597_0),
	ID(PCI_DEVICE_ID_VIA_82C598_0),
	ID(PCI_DEVICE_ID_VIA_8501_0),
	ID(PCI_DEVICE_ID_VIA_8601_0),
	ID(PCI_DEVICE_ID_VIA_82C691_0),
	ID(PCI_DEVICE_ID_VIA_8371_0),
	ID(PCI_DEVICE_ID_VIA_8633_0),
	ID(PCI_DEVICE_ID_VIA_XN266),
	ID(PCI_DEVICE_ID_VIA_8361),
	ID(PCI_DEVICE_ID_VIA_8363_0),
	ID(PCI_DEVICE_ID_VIA_8753_0),
	ID(PCI_DEVICE_ID_VIA_8367_0),
	ID(PCI_DEVICE_ID_VIA_8653_0),
	ID(PCI_DEVICE_ID_VIA_XM266),
	ID(PCI_DEVICE_ID_VIA_862X_0),
	ID(PCI_DEVICE_ID_VIA_8377_0),
	ID(PCI_DEVICE_ID_VIA_8605_0),
	ID(PCI_DEVICE_ID_VIA_8703_51_0),
	ID(PCI_DEVICE_ID_VIA_8754C_0),
	ID(PCI_DEVICE_ID_VIA_8763_0),
	ID(PCI_DEVICE_ID_VIA_8378_0),
	ID(PCI_DEVICE_ID_VIA_PT880),
	ID(PCI_DEVICE_ID_VIA_PT880ULTRA),
	ID(PCI_DEVICE_ID_VIA_8783_0),
	ID(PCI_DEVICE_ID_VIA_PX8X0_0),
	ID(PCI_DEVICE_ID_VIA_3269_0),
	ID(PCI_DEVICE_ID_VIA_83_87XX_1),
	ID(PCI_DEVICE_ID_VIA_3296_0),
	ID(PCI_DEVICE_ID_VIA_P4M800CE),
	ID(PCI_DEVICE_ID_VIA_VT3324),
	ID(PCI_DEVICE_ID_VIA_P4M890),
	ID(PCI_DEVICE_ID_VIA_VT3364),
	{ }
	};

	MODULE_DEVICE_TABLE(pci, agp_via_pci_table);

	static DEFINE_SIMPLE_DEV_PM_OPS(agp_via_pm_ops, NULL, agp_via_resume);

	static struct pci_driver agp_via_pci_driver = {
	.name = "agpgart-via",
	.id_table = agp_via_pci_table,
	.probe = agp_via_probe,
	.remove = agp_via_remove,
	.driver.pm = &agp_via_pm_ops,
	};


	static int __init agp_via_init(void)
	{
	if (agp_off)
	return -EINVAL;
	return pci_register_driver(&agp_via_pci_driver);
	}

	static void __exit agp_via_cleanup(void)
	{
	pci_unregister_driver(&agp_via_pci_driver);
	}

	module_init(agp_via_init);
	module_exit(agp_via_cleanup);

	MODULE_LICENSE("GPL");
	MODULE_AUTHOR("Dave Jones");