drivers/char/agp/ali-agp.c - kernel/bruno - Git at Google

 /*
  * ALi AGPGART routines.
  */

 #include <linux/types.h>
 #include <linux/module.h>
 #include <linux/pci.h>
 #include <linux/init.h>
 #include <linux/agp_backend.h>
 #include <asm/page.h>		/* PAGE_SIZE */
 #include "agp.h"

 #define ALI_AGPCTRL	0xb8
 #define ALI_ATTBASE	0xbc
 #define ALI_TLBCTRL	0xc0
 #define ALI_TAGCTRL	0xc4
 #define ALI_CACHE_FLUSH_CTRL	0xD0
 #define ALI_CACHE_FLUSH_ADDR_MASK	0xFFFFF000
 #define ALI_CACHE_FLUSH_EN	0x100

 static int ali_fetch_size(void)
 {
 	int i;
 	u32 temp;
 	struct aper_size_info_32 *values;

 	pci_read_config_dword(agp_bridge->dev, ALI_ATTBASE, &temp);
 	temp &= ~(0xfffffff0);
 	values = A_SIZE_32(agp_bridge->driver->aperture_sizes);

 	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 void ali_tlbflush(struct agp_memory *mem)
 {
 	u32 temp;

 	pci_read_config_dword(agp_bridge->dev, ALI_TLBCTRL, &temp);
 	temp &= 0xfffffff0;
 	temp |= (1<<0 | 1<<1);
 	pci_write_config_dword(agp_bridge->dev, ALI_TAGCTRL, temp);
 }

 static void ali_cleanup(void)
 {
 	struct aper_size_info_32 *previous_size;
 	u32 temp;

 	previous_size = A_SIZE_32(agp_bridge->previous_size);

 	pci_read_config_dword(agp_bridge->dev, ALI_TLBCTRL, &temp);
 // clear tag
 	pci_write_config_dword(agp_bridge->dev, ALI_TAGCTRL,
 			((temp & 0xffffff00) | 0x00000001|0x00000002));

 	pci_read_config_dword(agp_bridge->dev,  ALI_ATTBASE, &temp);
 	pci_write_config_dword(agp_bridge->dev, ALI_ATTBASE,
 			((temp & 0x00000ff0) | previous_size->size_value));
 }

 static int ali_configure(void)
 {
 	u32 temp;
 	struct aper_size_info_32 *current_size;

 	current_size = A_SIZE_32(agp_bridge->current_size);

 	/* aperture size and gatt addr */
 	pci_read_config_dword(agp_bridge->dev, ALI_ATTBASE, &temp);
 	temp = (((temp & 0x00000ff0) | (agp_bridge->gatt_bus_addr & 0xfffff000))
 			| (current_size->size_value & 0xf));
 	pci_write_config_dword(agp_bridge->dev, ALI_ATTBASE, temp);

 	/* tlb control */
 	pci_read_config_dword(agp_bridge->dev, ALI_TLBCTRL, &temp);
 	pci_write_config_dword(agp_bridge->dev, ALI_TLBCTRL, ((temp & 0xffffff00) | 0x00000010));

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

 #if 0
 	if (agp_bridge->type == ALI_M1541) {
 		u32 nlvm_addr = 0;

 		switch (current_size->size_value) {
 			case 0:  break;
 			case 1:  nlvm_addr = 0x100000;break;
 			case 2:  nlvm_addr = 0x200000;break;
 			case 3:  nlvm_addr = 0x400000;break;
 			case 4:  nlvm_addr = 0x800000;break;
 			case 6:  nlvm_addr = 0x1000000;break;
 			case 7:  nlvm_addr = 0x2000000;break;
 			case 8:  nlvm_addr = 0x4000000;break;
 			case 9:  nlvm_addr = 0x8000000;break;
 			case 10: nlvm_addr = 0x10000000;break;
 			default: break;
 		}
 		nlvm_addr--;
 		nlvm_addr&=0xfff00000;

 		nlvm_addr+= agp_bridge->gart_bus_addr;
 		nlvm_addr|=(agp_bridge->gart_bus_addr>>12);
 		dev_info(&agp_bridge->dev->dev, "nlvm top &base = %8x\n",
 			 nlvm_addr);
 	}
 #endif

 	pci_read_config_dword(agp_bridge->dev, ALI_TLBCTRL, &temp);
 	temp &= 0xffffff7f;		//enable TLB
 	pci_write_config_dword(agp_bridge->dev, ALI_TLBCTRL, temp);

 	return 0;
 }


 static void m1541_cache_flush(void)
 {
 	int i, page_count;
 	u32 temp;

 	global_cache_flush();

 	page_count = 1 << A_SIZE_32(agp_bridge->current_size)->page_order;
 	for (i = 0; i < PAGE_SIZE * page_count; i += PAGE_SIZE) {
 		pci_read_config_dword(agp_bridge->dev, ALI_CACHE_FLUSH_CTRL,
 				&temp);
 		pci_write_config_dword(agp_bridge->dev, ALI_CACHE_FLUSH_CTRL,
 				(((temp & ALI_CACHE_FLUSH_ADDR_MASK) |
 				  (agp_bridge->gatt_bus_addr + i)) |
 				 ALI_CACHE_FLUSH_EN));
 	}
 }

 static struct page *m1541_alloc_page(struct agp_bridge_data *bridge)
 {
 	struct page *page = agp_generic_alloc_page(agp_bridge);
 	u32 temp;

 	if (!page)
 		return NULL;

 	pci_read_config_dword(agp_bridge->dev, ALI_CACHE_FLUSH_CTRL, &temp);
 	pci_write_config_dword(agp_bridge->dev, ALI_CACHE_FLUSH_CTRL,
 			(((temp & ALI_CACHE_FLUSH_ADDR_MASK) |
 			  page_to_phys(page)) | ALI_CACHE_FLUSH_EN ));
 	return page;
 }

 static void ali_destroy_page(struct page *page, int flags)
 {
 	if (page) {
 		if (flags & AGP_PAGE_DESTROY_UNMAP) {
 			global_cache_flush();	/* is this really needed?  --hch */
 			agp_generic_destroy_page(page, flags);
 		} else
 			agp_generic_destroy_page(page, flags);
 	}
 }

 static void m1541_destroy_page(struct page *page, int flags)
 {
 	u32 temp;

 	if (page == NULL)
 		return;

 	if (flags & AGP_PAGE_DESTROY_UNMAP) {
 		global_cache_flush();

 		pci_read_config_dword(agp_bridge->dev, ALI_CACHE_FLUSH_CTRL, &temp);
 		pci_write_config_dword(agp_bridge->dev, ALI_CACHE_FLUSH_CTRL,
 				       (((temp & ALI_CACHE_FLUSH_ADDR_MASK) |
 					 page_to_phys(page)) | ALI_CACHE_FLUSH_EN));
 	}
 	agp_generic_destroy_page(page, flags);
 }


 /* Setup function */

 static const struct aper_size_info_32 ali_generic_sizes[7] =
 {
 	{256, 65536, 6, 10},
 	{128, 32768, 5, 9},
 	{64, 16384, 4, 8},
 	{32, 8192, 3, 7},
 	{16, 4096, 2, 6},
 	{8, 2048, 1, 4},
 	{4, 1024, 0, 3}
 };

 static const struct agp_bridge_driver ali_generic_bridge = {
 	.owner			= THIS_MODULE,
 	.aperture_sizes		= ali_generic_sizes,
 	.size_type		= U32_APER_SIZE,
 	.num_aperture_sizes	= 7,
 	.needs_scratch_page	= true,
 	.configure		= ali_configure,
 	.fetch_size		= ali_fetch_size,
 	.cleanup		= ali_cleanup,
 	.tlb_flush		= ali_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_destroy_page	= ali_destroy_page,
 	.agp_type_to_mask_type  = agp_generic_type_to_mask_type,
 };

 static const struct agp_bridge_driver ali_m1541_bridge = {
 	.owner			= THIS_MODULE,
 	.aperture_sizes		= ali_generic_sizes,
 	.size_type		= U32_APER_SIZE,
 	.num_aperture_sizes	= 7,
 	.configure		= ali_configure,
 	.fetch_size		= ali_fetch_size,
 	.cleanup		= ali_cleanup,
 	.tlb_flush		= ali_tlbflush,
 	.mask_memory		= agp_generic_mask_memory,
 	.masks			= NULL,
 	.agp_enable		= agp_generic_enable,
 	.cache_flush		= m1541_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		= m1541_alloc_page,
 	.agp_destroy_page	= m1541_destroy_page,
 	.agp_type_to_mask_type  = agp_generic_type_to_mask_type,
 };


 static struct agp_device_ids ali_agp_device_ids[] =
 {
 	{
 		.device_id	= PCI_DEVICE_ID_AL_M1541,
 		.chipset_name	= "M1541",
 	},
 	{
 		.device_id	= PCI_DEVICE_ID_AL_M1621,
 		.chipset_name	= "M1621",
 	},
 	{
 		.device_id	= PCI_DEVICE_ID_AL_M1631,
 		.chipset_name	= "M1631",
 	},
 	{
 		.device_id	= PCI_DEVICE_ID_AL_M1632,
 		.chipset_name	= "M1632",
 	},
 	{
 		.device_id	= PCI_DEVICE_ID_AL_M1641,
 		.chipset_name	= "M1641",
 	},
 	{
 		.device_id	= PCI_DEVICE_ID_AL_M1644,
 		.chipset_name	= "M1644",
 	},
 	{
 		.device_id	= PCI_DEVICE_ID_AL_M1647,
 		.chipset_name	= "M1647",
 	},
 	{
 		.device_id	= PCI_DEVICE_ID_AL_M1651,
 		.chipset_name	= "M1651",
 	},
 	{
 		.device_id	= PCI_DEVICE_ID_AL_M1671,
 		.chipset_name	= "M1671",
 	},
 	{
 		.device_id	= PCI_DEVICE_ID_AL_M1681,
 		.chipset_name	= "M1681",
 	},
 	{
 		.device_id	= PCI_DEVICE_ID_AL_M1683,
 		.chipset_name	= "M1683",
 	},

 	{ }, /* dummy final entry, always present */
 };

 static int agp_ali_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 {
 	struct agp_device_ids *devs = ali_agp_device_ids;
 	struct agp_bridge_data *bridge;
 	u8 hidden_1621_id, cap_ptr;
 	int j;

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

 	/* probe for known chipsets */
 	for (j = 0; devs[j].chipset_name; j++) {
 		if (pdev->device == devs[j].device_id)
 			goto found;
 	}

 	dev_err(&pdev->dev, "unsupported ALi chipset [%04x/%04x])\n",
 		pdev->vendor, pdev->device);
 	return -ENODEV;


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

 	bridge->dev = pdev;
 	bridge->capndx = cap_ptr;

 	switch (pdev->device) {
 	case PCI_DEVICE_ID_AL_M1541:
 		bridge->driver = &ali_m1541_bridge;
 		break;
 	case PCI_DEVICE_ID_AL_M1621:
 		pci_read_config_byte(pdev, 0xFB, &hidden_1621_id);
 		switch (hidden_1621_id) {
 		case 0x31:
 			devs[j].chipset_name = "M1631";
 			break;
 		case 0x32:
 			devs[j].chipset_name = "M1632";
 			break;
 		case 0x41:
 			devs[j].chipset_name = "M1641";
 			break;
 		case 0x43:
 			devs[j].chipset_name = "M1621";
 			break;
 		case 0x47:
 			devs[j].chipset_name = "M1647";
 			break;
 		case 0x51:
 			devs[j].chipset_name = "M1651";
 			break;
 		default:
 			break;
 		}
 		/*FALLTHROUGH*/
 	default:
 		bridge->driver = &ali_generic_bridge;
 	}

 	dev_info(&pdev->dev, "ALi %s chipset\n", devs[j].chipset_name);

 	/* 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_ali_remove(struct pci_dev *pdev)
 {
 	struct agp_bridge_data *bridge = pci_get_drvdata(pdev);

 	agp_remove_bridge(bridge);
 	agp_put_bridge(bridge);
 }

 static struct pci_device_id agp_ali_pci_table[] = {
 	{
 	.class		= (PCI_CLASS_BRIDGE_HOST << 8),
 	.class_mask	= ~0,
 	.vendor		= PCI_VENDOR_ID_AL,
 	.device		= PCI_ANY_ID,
 	.subvendor	= PCI_ANY_ID,
 	.subdevice	= PCI_ANY_ID,
 	},
 	{ }
 };

 MODULE_DEVICE_TABLE(pci, agp_ali_pci_table);

 static struct pci_driver agp_ali_pci_driver = {
 	.name		= "agpgart-ali",
 	.id_table	= agp_ali_pci_table,
 	.probe		= agp_ali_probe,
 	.remove		= agp_ali_remove,
 };

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

 static void __exit agp_ali_cleanup(void)
 {
 	pci_unregister_driver(&agp_ali_pci_driver);
 }

 module_init(agp_ali_init);
 module_exit(agp_ali_cleanup);

 MODULE_AUTHOR("Dave Jones");
 MODULE_LICENSE("GPL and additional rights");
	/*
	* ALi AGPGART routines.
	*/

	#include <linux/types.h>
	#include <linux/module.h>
	#include <linux/pci.h>
	#include <linux/init.h>
	#include <linux/agp_backend.h>
	#include <asm/page.h> /* PAGE_SIZE */
	#include "agp.h"

	#define ALI_AGPCTRL 0xb8
	#define ALI_ATTBASE 0xbc
	#define ALI_TLBCTRL 0xc0
	#define ALI_TAGCTRL 0xc4
	#define ALI_CACHE_FLUSH_CTRL 0xD0
	#define ALI_CACHE_FLUSH_ADDR_MASK 0xFFFFF000
	#define ALI_CACHE_FLUSH_EN 0x100

	static int ali_fetch_size(void)
	{
	int i;
	u32 temp;
	struct aper_size_info_32 *values;

	pci_read_config_dword(agp_bridge->dev, ALI_ATTBASE, &temp);
	temp &= ~(0xfffffff0);
	values = A_SIZE_32(agp_bridge->driver->aperture_sizes);

	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 void ali_tlbflush(struct agp_memory *mem)
	{
	u32 temp;

	pci_read_config_dword(agp_bridge->dev, ALI_TLBCTRL, &temp);
	temp &= 0xfffffff0;
	temp \|= (1<<0 \| 1<<1);
	pci_write_config_dword(agp_bridge->dev, ALI_TAGCTRL, temp);
	}

	static void ali_cleanup(void)
	{
	struct aper_size_info_32 *previous_size;
	u32 temp;

	previous_size = A_SIZE_32(agp_bridge->previous_size);

	pci_read_config_dword(agp_bridge->dev, ALI_TLBCTRL, &temp);
	// clear tag
	pci_write_config_dword(agp_bridge->dev, ALI_TAGCTRL,
	((temp & 0xffffff00) \| 0x00000001\|0x00000002));

	pci_read_config_dword(agp_bridge->dev, ALI_ATTBASE, &temp);
	pci_write_config_dword(agp_bridge->dev, ALI_ATTBASE,
	((temp & 0x00000ff0) \| previous_size->size_value));
	}

	static int ali_configure(void)
	{
	u32 temp;
	struct aper_size_info_32 *current_size;

	current_size = A_SIZE_32(agp_bridge->current_size);

	/* aperture size and gatt addr */
	pci_read_config_dword(agp_bridge->dev, ALI_ATTBASE, &temp);
	temp = (((temp & 0x00000ff0) \| (agp_bridge->gatt_bus_addr & 0xfffff000))
	\| (current_size->size_value & 0xf));
	pci_write_config_dword(agp_bridge->dev, ALI_ATTBASE, temp);

	/* tlb control */
	pci_read_config_dword(agp_bridge->dev, ALI_TLBCTRL, &temp);
	pci_write_config_dword(agp_bridge->dev, ALI_TLBCTRL, ((temp & 0xffffff00) \| 0x00000010));

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

	#if 0
	if (agp_bridge->type == ALI_M1541) {
	u32 nlvm_addr = 0;

	switch (current_size->size_value) {
	case 0: break;
	case 1: nlvm_addr = 0x100000;break;
	case 2: nlvm_addr = 0x200000;break;
	case 3: nlvm_addr = 0x400000;break;
	case 4: nlvm_addr = 0x800000;break;
	case 6: nlvm_addr = 0x1000000;break;
	case 7: nlvm_addr = 0x2000000;break;
	case 8: nlvm_addr = 0x4000000;break;
	case 9: nlvm_addr = 0x8000000;break;
	case 10: nlvm_addr = 0x10000000;break;
	default: break;
	}
	nlvm_addr--;
	nlvm_addr&=0xfff00000;

	nlvm_addr+= agp_bridge->gart_bus_addr;
	nlvm_addr\|=(agp_bridge->gart_bus_addr>>12);
	dev_info(&agp_bridge->dev->dev, "nlvm top &base = %8x\n",
	nlvm_addr);
	}
	#endif

	pci_read_config_dword(agp_bridge->dev, ALI_TLBCTRL, &temp);
	temp &= 0xffffff7f; //enable TLB
	pci_write_config_dword(agp_bridge->dev, ALI_TLBCTRL, temp);

	return 0;
	}


	static void m1541_cache_flush(void)
	{
	int i, page_count;
	u32 temp;

	global_cache_flush();

	page_count = 1 << A_SIZE_32(agp_bridge->current_size)->page_order;
	for (i = 0; i < PAGE_SIZE * page_count; i += PAGE_SIZE) {
	pci_read_config_dword(agp_bridge->dev, ALI_CACHE_FLUSH_CTRL,
	&temp);
	pci_write_config_dword(agp_bridge->dev, ALI_CACHE_FLUSH_CTRL,
	(((temp & ALI_CACHE_FLUSH_ADDR_MASK) \|
	(agp_bridge->gatt_bus_addr + i)) \|
	ALI_CACHE_FLUSH_EN));
	}
	}

	static struct page m1541_alloc_page(struct agp_bridge_data bridge)
	{
	struct page *page = agp_generic_alloc_page(agp_bridge);
	u32 temp;

	if (!page)
	return NULL;

	pci_read_config_dword(agp_bridge->dev, ALI_CACHE_FLUSH_CTRL, &temp);
	pci_write_config_dword(agp_bridge->dev, ALI_CACHE_FLUSH_CTRL,
	(((temp & ALI_CACHE_FLUSH_ADDR_MASK) \|
	page_to_phys(page)) \| ALI_CACHE_FLUSH_EN ));
	return page;
	}

	static void ali_destroy_page(struct page *page, int flags)
	{
	if (page) {
	if (flags & AGP_PAGE_DESTROY_UNMAP) {
	global_cache_flush(); /* is this really needed? --hch */
	agp_generic_destroy_page(page, flags);
	} else
	agp_generic_destroy_page(page, flags);
	}
	}

	static void m1541_destroy_page(struct page *page, int flags)
	{
	u32 temp;

	if (page == NULL)
	return;

	if (flags & AGP_PAGE_DESTROY_UNMAP) {
	global_cache_flush();

	pci_read_config_dword(agp_bridge->dev, ALI_CACHE_FLUSH_CTRL, &temp);
	pci_write_config_dword(agp_bridge->dev, ALI_CACHE_FLUSH_CTRL,
	(((temp & ALI_CACHE_FLUSH_ADDR_MASK) \|
	page_to_phys(page)) \| ALI_CACHE_FLUSH_EN));
	}
	agp_generic_destroy_page(page, flags);
	}


	/* Setup function */

	static const struct aper_size_info_32 ali_generic_sizes[7] =
	{
	{256, 65536, 6, 10},
	{128, 32768, 5, 9},
	{64, 16384, 4, 8},
	{32, 8192, 3, 7},
	{16, 4096, 2, 6},
	{8, 2048, 1, 4},
	{4, 1024, 0, 3}
	};

	static const struct agp_bridge_driver ali_generic_bridge = {
	.owner = THIS_MODULE,
	.aperture_sizes = ali_generic_sizes,
	.size_type = U32_APER_SIZE,
	.num_aperture_sizes = 7,
	.needs_scratch_page = true,
	.configure = ali_configure,
	.fetch_size = ali_fetch_size,
	.cleanup = ali_cleanup,
	.tlb_flush = ali_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_destroy_page = ali_destroy_page,
	.agp_type_to_mask_type = agp_generic_type_to_mask_type,
	};

	static const struct agp_bridge_driver ali_m1541_bridge = {
	.owner = THIS_MODULE,
	.aperture_sizes = ali_generic_sizes,
	.size_type = U32_APER_SIZE,
	.num_aperture_sizes = 7,
	.configure = ali_configure,
	.fetch_size = ali_fetch_size,
	.cleanup = ali_cleanup,
	.tlb_flush = ali_tlbflush,
	.mask_memory = agp_generic_mask_memory,
	.masks = NULL,
	.agp_enable = agp_generic_enable,
	.cache_flush = m1541_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 = m1541_alloc_page,
	.agp_destroy_page = m1541_destroy_page,
	.agp_type_to_mask_type = agp_generic_type_to_mask_type,
	};


	static struct agp_device_ids ali_agp_device_ids[] =
	{
	{
	.device_id = PCI_DEVICE_ID_AL_M1541,
	.chipset_name = "M1541",
	},
	{
	.device_id = PCI_DEVICE_ID_AL_M1621,
	.chipset_name = "M1621",
	},
	{
	.device_id = PCI_DEVICE_ID_AL_M1631,
	.chipset_name = "M1631",
	},
	{
	.device_id = PCI_DEVICE_ID_AL_M1632,
	.chipset_name = "M1632",
	},
	{
	.device_id = PCI_DEVICE_ID_AL_M1641,
	.chipset_name = "M1641",
	},
	{
	.device_id = PCI_DEVICE_ID_AL_M1644,
	.chipset_name = "M1644",
	},
	{
	.device_id = PCI_DEVICE_ID_AL_M1647,
	.chipset_name = "M1647",
	},
	{
	.device_id = PCI_DEVICE_ID_AL_M1651,
	.chipset_name = "M1651",
	},
	{
	.device_id = PCI_DEVICE_ID_AL_M1671,
	.chipset_name = "M1671",
	},
	{
	.device_id = PCI_DEVICE_ID_AL_M1681,
	.chipset_name = "M1681",
	},
	{
	.device_id = PCI_DEVICE_ID_AL_M1683,
	.chipset_name = "M1683",
	},

	{ }, /* dummy final entry, always present */
	};

	static int agp_ali_probe(struct pci_dev pdev, const struct pci_device_id ent)
	{
	struct agp_device_ids *devs = ali_agp_device_ids;
	struct agp_bridge_data *bridge;
	u8 hidden_1621_id, cap_ptr;
	int j;

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

	/* probe for known chipsets */
	for (j = 0; devs[j].chipset_name; j++) {
	if (pdev->device == devs[j].device_id)
	goto found;
	}

	dev_err(&pdev->dev, "unsupported ALi chipset [%04x/%04x])\n",
	pdev->vendor, pdev->device);
	return -ENODEV;


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

	bridge->dev = pdev;
	bridge->capndx = cap_ptr;

	switch (pdev->device) {
	case PCI_DEVICE_ID_AL_M1541:
	bridge->driver = &ali_m1541_bridge;
	break;
	case PCI_DEVICE_ID_AL_M1621:
	pci_read_config_byte(pdev, 0xFB, &hidden_1621_id);
	switch (hidden_1621_id) {
	case 0x31:
	devs[j].chipset_name = "M1631";
	break;
	case 0x32:
	devs[j].chipset_name = "M1632";
	break;
	case 0x41:
	devs[j].chipset_name = "M1641";
	break;
	case 0x43:
	devs[j].chipset_name = "M1621";
	break;
	case 0x47:
	devs[j].chipset_name = "M1647";
	break;
	case 0x51:
	devs[j].chipset_name = "M1651";
	break;
	default:
	break;
	}
	/FALLTHROUGH/
	default:
	bridge->driver = &ali_generic_bridge;
	}

	dev_info(&pdev->dev, "ALi %s chipset\n", devs[j].chipset_name);

	/* 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_ali_remove(struct pci_dev *pdev)
	{
	struct agp_bridge_data *bridge = pci_get_drvdata(pdev);

	agp_remove_bridge(bridge);
	agp_put_bridge(bridge);
	}

	static struct pci_device_id agp_ali_pci_table[] = {
	{
	.class = (PCI_CLASS_BRIDGE_HOST << 8),
	.class_mask = ~0,
	.vendor = PCI_VENDOR_ID_AL,
	.device = PCI_ANY_ID,
	.subvendor = PCI_ANY_ID,
	.subdevice = PCI_ANY_ID,
	},
	{ }
	};

	MODULE_DEVICE_TABLE(pci, agp_ali_pci_table);

	static struct pci_driver agp_ali_pci_driver = {
	.name = "agpgart-ali",
	.id_table = agp_ali_pci_table,
	.probe = agp_ali_probe,
	.remove = agp_ali_remove,
	};

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

	static void __exit agp_ali_cleanup(void)
	{
	pci_unregister_driver(&agp_ali_pci_driver);
	}

	module_init(agp_ali_init);
	module_exit(agp_ali_cleanup);

	MODULE_AUTHOR("Dave Jones");
	MODULE_LICENSE("GPL and additional rights");