/* * AMD K7 AGPGART routines. */#include <linux/module.h>#include <linux/pci.h>#include <linux/init.h>#include <linux/agp_backend.h>#include <linux/gfp.h>#include <linux/page-flags.h>#include <linux/mm.h>#include "agp.h"#define AMD_MMBASE	0x14#define AMD_APSIZE	0xac#define AMD_MODECNTL	0xb0#define AMD_MODECNTL2	0xb2#define AMD_GARTENABLE	0x02	/* In mmio region (16-bit register) */#define AMD_ATTBASE	0x04	/* In mmio region (32-bit register) */#define AMD_TLBFLUSH	0x0c	/* In mmio region (32-bit register) */#define AMD_CACHEENTRY	0x10	/* In mmio region (32-bit register) */static struct pci_device_id agp_amdk7_pci_table[];struct amd_page_map {	unsigned long *real;	unsigned long __iomem *remapped;};static struct _amd_irongate_private {	volatile u8 __iomem *registers;	struct amd_page_map **gatt_pages;	int num_tables;} amd_irongate_private;static int amd_create_page_map(struct amd_page_map *page_map){	int i;	page_map->real = (unsigned long *) __get_free_page(GFP_KERNEL);	if (page_map->real == NULL)		return -ENOMEM;	SetPageReserved(virt_to_page(page_map->real));	global_cache_flush();	page_map->remapped = ioremap_nocache(virt_to_gart(page_map->real),					    PAGE_SIZE);	if (page_map->remapped == NULL) {		ClearPageReserved(virt_to_page(page_map->real));		free_page((unsigned long) page_map->real);		page_map->real = NULL;		return -ENOMEM;	}	global_cache_flush();	for (i = 0; i < PAGE_SIZE / sizeof(unsigned long); i++) {		writel(agp_bridge->scratch_page, page_map->remapped+i);		readl(page_map->remapped+i);	/* PCI Posting. */	}	return 0;}static void amd_free_page_map(struct amd_page_map *page_map){	iounmap(page_map->remapped);	ClearPageReserved(virt_to_page(page_map->real));	free_page((unsigned long) page_map->real);}static void amd_free_gatt_pages(void){	int i;	struct amd_page_map **tables;	struct amd_page_map *entry;	tables = amd_irongate_private.gatt_pages;	for (i = 0; i < amd_irongate_private.num_tables; i++) {		entry = tables[i];		if (entry != NULL) {			if (entry->real != NULL)				amd_free_page_map(entry);			kfree(entry);		}	}	kfree(tables);	amd_irongate_private.gatt_pages = NULL;}static int amd_create_gatt_pages(int nr_tables){	struct amd_page_map **tables;	struct amd_page_map *entry;	int retval = 0;	int i;	tables = kmalloc((nr_tables + 1) * sizeof(struct amd_page_map *),			 GFP_KERNEL);	if (tables == NULL)		return -ENOMEM;	memset (tables, 0, sizeof(struct amd_page_map *) * (nr_tables + 1));	for (i = 0; i < nr_tables; i++) {		entry = kmalloc(sizeof(struct amd_page_map), GFP_KERNEL);		if (entry == NULL) {			retval = -ENOMEM;			break;		}		memset (entry, 0, sizeof(struct amd_page_map));		tables[i] = entry;		retval = amd_create_page_map(entry);		if (retval != 0)			break;	}	amd_irongate_private.num_tables = nr_tables;	amd_irongate_private.gatt_pages = tables;	if (retval != 0)		amd_free_gatt_pages();	return retval;}/* Since we don't need contigious memory we just try * to get the gatt table once */#define GET_PAGE_DIR_OFF(addr) (addr >> 22)#define GET_PAGE_DIR_IDX(addr) (GET_PAGE_DIR_OFF(addr) - \	GET_PAGE_DIR_OFF(agp_bridge->gart_bus_addr))#define GET_GATT_OFF(addr) ((addr & 0x003ff000) >> 12)#define GET_GATT(addr) (amd_irongate_private.gatt_pages[\	GET_PAGE_DIR_IDX(addr)]->remapped)static int amd_create_gatt_table(struct agp_bridge_data *bridge){	struct aper_size_info_lvl2 *value;	struct amd_page_map page_dir;	unsigned long addr;	int retval;	u32 temp;	int i;	value = A_SIZE_LVL2(agp_bridge->current_size);	retval = amd_create_page_map(&page_dir);	if (retval != 0)		return retval;	retval = amd_create_gatt_pages(value->num_entries / 1024);	if (retval != 0) {		amd_free_page_map(&page_dir);		return retval;	}	agp_bridge->gatt_table_real = (u32 *)page_dir.real;	agp_bridge->gatt_table = (u32 __iomem *)page_dir.remapped;	agp_bridge->gatt_bus_addr = virt_to_gart(page_dir.real);	/* Get the address for the gart region.	 * This is a bus address even on the alpha, b/c its	 * used to program the agp master not the cpu	 */	pci_read_config_dword(agp_bridge->dev, AGP_APBASE, &temp);	addr = (temp & PCI_BASE_ADDRESS_MEM_MASK);	agp_bridge->gart_bus_addr = addr;	/* Calculate the agp offset */	for (i = 0; i < value->num_entries / 1024; i++, addr += 0x00400000) {		writel(virt_to_gart(amd_irongate_private.gatt_pages[i]->real) | 1,			page_dir.remapped+GET_PAGE_DIR_OFF(addr));		readl(page_dir.remapped+GET_PAGE_DIR_OFF(addr));	/* PCI Posting. */	}	return 0;}static int amd_free_gatt_table(struct agp_bridge_data *bridge){	struct amd_page_map page_dir;	page_dir.real = (unsigned long *)agp_bridge->gatt_table_real;	page_dir.remapped = (unsigned long __iomem *)agp_bridge->gatt_table;	amd_free_gatt_pages();	amd_free_page_map(&page_dir);	return 0;}static int amd_irongate_fetch_size(void){	int i;	u32 temp;	struct aper_size_info_lvl2 *values;	pci_read_config_dword(agp_bridge->dev, AMD_APSIZE, &temp);	temp = (temp & 0x0000000e);	values = A_SIZE_LVL2(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 int amd_irongate_configure(void){	struct aper_size_info_lvl2 *current_size;	u32 temp;	u16 enable_reg;	current_size = A_SIZE_LVL2(agp_bridge->current_size);	/* Get the memory mapped registers */	pci_read_config_dword(agp_bridge->dev, AMD_MMBASE, &temp);	temp = (temp & PCI_BASE_ADDRESS_MEM_MASK);	amd_irongate_private.registers = (volatile u8 __iomem *) ioremap(temp, 4096);	/* Write out the address of the gatt table */	writel(agp_bridge->gatt_bus_addr, amd_irongate_private.registers+AMD_ATTBASE);	readl(amd_irongate_private.registers+AMD_ATTBASE);	/* PCI Posting. */	/* Write the Sync register */	pci_write_config_byte(agp_bridge->dev, AMD_MODECNTL, 0x80);	/* Set indexing mode */	pci_write_config_byte(agp_bridge->dev, AMD_MODECNTL2, 0x00);	/* Write the enable register */	enable_reg = readw(amd_irongate_private.registers+AMD_GARTENABLE);	enable_reg = (enable_reg | 0x0004);	writew(enable_reg, amd_irongate_private.registers+AMD_GARTENABLE);	readw(amd_irongate_private.registers+AMD_GARTENABLE);	/* PCI Posting. */	/* Write out the size register */	pci_read_config_dword(agp_bridge->dev, AMD_APSIZE, &temp);	temp = (((temp & ~(0x0000000e)) | current_size->size_value) | 1);	pci_write_config_dword(agp_bridge->dev, AMD_APSIZE, temp);	/* Flush the tlb */	writel(1, amd_irongate_private.registers+AMD_TLBFLUSH);	readl(amd_irongate_private.registers+AMD_TLBFLUSH);	/* PCI Posting.*/	return 0;}static void amd_irongate_cleanup(void){	struct aper_size_info_lvl2 *previous_size;	u32 temp;	u16 enable_reg;	previous_size = A_SIZE_LVL2(agp_bridge->previous_size);	enable_reg = readw(amd_irongate_private.registers+AMD_GARTENABLE);	enable_reg = (enable_reg & ~(0x0004));	writew(enable_reg, amd_irongate_private.registers+AMD_GARTENABLE);	readw(amd_irongate_private.registers+AMD_GARTENABLE);	/* PCI Posting. */	/* Write back the previous size and disable gart translation */	pci_read_config_dword(agp_bridge->dev, AMD_APSIZE, &temp);	temp = ((temp & ~(0x0000000f)) | previous_size->size_value);	pci_write_config_dword(agp_bridge->dev, AMD_APSIZE, temp);	iounmap((void __iomem *) amd_irongate_private.registers);}/* * This routine could be implemented by taking the addresses * written to the GATT, and flushing them individually.  However * currently it just flushes the whole table.  Which is probably * more efficent, since agp_memory blocks can be a large number of * entries. */static void amd_irongate_tlbflush(struct agp_memory *temp){	writel(1, amd_irongate_private.registers+AMD_TLBFLUSH);	readl(amd_irongate_private.registers+AMD_TLBFLUSH);	/* PCI Posting. */}static int amd_insert_memory(struct agp_memory *mem, off_t pg_start, int type){	int i, j, num_entries;	unsigned long __iomem *cur_gatt;	unsigned long addr;	num_entries = A_SIZE_LVL2(agp_bridge->current_size)->num_entries;	if (type != 0 || mem->type != 0)		return -EINVAL;	if ((pg_start + mem->page_count) > num_entries)		return -EINVAL;	j = pg_start;	while (j < (pg_start + mem->page_count)) {		addr = (j * PAGE_SIZE) + agp_bridge->gart_bus_addr;		cur_gatt = GET_GATT(addr);		if (!PGE_EMPTY(agp_bridge, readl(cur_gatt+GET_GATT_OFF(addr))))			return -EBUSY;		j++;	}	if (mem->is_flushed == FALSE) {		global_cache_flush();		mem->is_flushed = TRUE;	}	for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {		addr = (j * PAGE_SIZE) + agp_bridge->gart_bus_addr;		cur_gatt = GET_GATT(addr);		writel(agp_generic_mask_memory(agp_bridge,			mem->memory[i], mem->type), cur_gatt+GET_GATT_OFF(addr));		readl(cur_gatt+GET_GATT_OFF(addr));	/* PCI Posting. */	}	amd_irongate_tlbflush(mem);	return 0;}static int amd_remove_memory(struct agp_memory *mem, off_t pg_start, int type){	int i;	unsigned long __iomem *cur_gatt;	unsigned long addr;	if (type != 0 || mem->type != 0)		return -EINVAL;	for (i = pg_start; i < (mem->page_count + pg_start); i++) {		addr = (i * PAGE_SIZE) + agp_bridge->gart_bus_addr;		cur_gatt = GET_GATT(addr);		writel(agp_bridge->scratch_page, cur_gatt+GET_GATT_OFF(addr));		readl(cur_gatt+GET_GATT_OFF(addr));	/* PCI Posting. */	}	amd_irongate_tlbflush(mem);	return 0;}static struct aper_size_info_lvl2 amd_irongate_sizes[7] ={	{2048, 524288, 0x0000000c},	{1024, 262144, 0x0000000a},	{512, 131072, 0x00000008},	{256, 65536, 0x00000006},	{128, 32768, 0x00000004},	{64, 16384, 0x00000002},	{32, 8192, 0x00000000}};static struct gatt_mask amd_irongate_masks[] ={	{.mask = 1, .type = 0}};static struct agp_bridge_driver amd_irongate_driver = {	.owner			= THIS_MODULE,	.aperture_sizes		= amd_irongate_sizes,	.size_type		= LVL2_APER_SIZE,	.num_aperture_sizes	= 7,	.configure		= amd_irongate_configure,	.fetch_size		= amd_irongate_fetch_size,	.cleanup		= amd_irongate_cleanup,	.tlb_flush		= amd_irongate_tlbflush,	.mask_memory		= agp_generic_mask_memory,	.masks			= amd_irongate_masks,	.agp_enable		= agp_generic_enable,	.cache_flush		= global_cache_flush,	.create_gatt_table	= amd_create_gatt_table,	.free_gatt_table	= amd_free_gatt_table,	.insert_memory		= amd_insert_memory,	.remove_memory		= amd_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	= agp_generic_destroy_page,};static struct agp_device_ids amd_agp_device_ids[] __devinitdata ={	{		.device_id	= PCI_DEVICE_ID_AMD_FE_GATE_7006,		.chipset_name	= "Irongate",	},	{		.device_id	= PCI_DEVICE_ID_AMD_FE_GATE_700E,		.chipset_name	= "761",	},	{		.device_id	= PCI_DEVICE_ID_AMD_FE_GATE_700C,		.chipset_name	= "760MP",	},	{ }, /* dummy final entry, always present */};static int __devinit agp_amdk7_probe(struct pci_dev *pdev,				     const struct pci_device_id *ent){	struct agp_bridge_data *bridge;	u8 cap_ptr;	int j;	cap_ptr = pci_find_capability(pdev, PCI_CAP_ID_AGP);	if (!cap_ptr)		return -ENODEV;	j = ent - agp_amdk7_pci_table;	printk(KERN_INFO PFX "Detected AMD %s chipset\n",	       amd_agp_device_ids[j].chipset_name);	bridge = agp_alloc_bridge();	if (!bridge)		return -ENOMEM;	bridge->driver = &amd_irongate_driver;	bridge->dev_private_data = &amd_irongate_private,	bridge->dev = pdev;	bridge->capndx = cap_ptr;	/* 751 Errata (22564_B-1.PDF)	   erratum 20: strobe glitch with Nvidia NV10 GeForce cards.	   system controller may experience noise due to strong drive strengths	 */	if (agp_bridge->dev->device == PCI_DEVICE_ID_AMD_FE_GATE_7006) {		u8 cap_ptr=0;		struct pci_dev *gfxcard=NULL;		while (!cap_ptr) {			gfxcard = pci_get_class(PCI_CLASS_DISPLAY_VGA<<8, gfxcard);			if (!gfxcard) {				printk (KERN_INFO PFX "Couldn't find an AGP VGA controller.\n");				return -ENODEV;			}			cap_ptr = pci_find_capability(gfxcard, PCI_CAP_ID_AGP);			if (!cap_ptr) {				pci_dev_put(gfxcard);				continue;			}		}		/* With so many variants of NVidia cards, it's simpler just		   to blacklist them all, and then whitelist them as needed		   (if necessary at all). */		if (gfxcard->vendor == PCI_VENDOR_ID_NVIDIA) {			agp_bridge->flags |= AGP_ERRATA_1X;			printk (KERN_INFO PFX "AMD 751 chipset with NVidia GeForce detected. Forcing to 1X due to errata.\n");		}		pci_dev_put(gfxcard);	}	/* 761 Errata (23613_F.pdf)	 * Revisions B0/B1 were a disaster.	 * erratum 44: SYSCLK/AGPCLK skew causes 2X failures -- Force mode to 1X	 * erratum 45: Timing problem prevents fast writes -- Disable fast write.	 * erratum 46: Setup violation on AGP SBA pins - Disable side band addressing.	 * With this lot disabled, we should prevent lockups. */	if (agp_bridge->dev->device == PCI_DEVICE_ID_AMD_FE_GATE_700E) {		u8 revision=0;		pci_read_config_byte(pdev, PCI_REVISION_ID, &revision);		if (revision == 0x10 || revision == 0x11) {			agp_bridge->flags = AGP_ERRATA_FASTWRITES;			agp_bridge->flags |= AGP_ERRATA_SBA;			agp_bridge->flags |= AGP_ERRATA_1X;			printk (KERN_INFO PFX "AMD 761 chipset with errata detected - disabling AGP fast writes & SBA and forcing to 1X.\n");		}	}	/* 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 __devexit agp_amdk7_remove(struct pci_dev *pdev){	struct agp_bridge_data *bridge = pci_get_drvdata(pdev);	agp_remove_bridge(bridge);	agp_put_bridge(bridge);}/* must be the same order as name table above */static struct pci_device_id agp_amdk7_pci_table[] = {	{	.class		= (PCI_CLASS_BRIDGE_HOST << 8),	.class_mask	= ~0,	.vendor		= PCI_VENDOR_ID_AMD,	.device		= PCI_DEVICE_ID_AMD_FE_GATE_7006,	.subvendor	= PCI_ANY_ID,	.subdevice	= PCI_ANY_ID,	},	{	.class		= (PCI_CLASS_BRIDGE_HOST << 8),	.class_mask	= ~0,	.vendor		= PCI_VENDOR_ID_AMD,	.device		= PCI_DEVICE_ID_AMD_FE_GATE_700E,	.subvendor	= PCI_ANY_ID,	.subdevice	= PCI_ANY_ID,	},	{	.class		= (PCI_CLASS_BRIDGE_HOST << 8),	.class_mask	= ~0,	.vendor		= PCI_VENDOR_ID_AMD,	.device		= PCI_DEVICE_ID_AMD_FE_GATE_700C,	.subvendor	= PCI_ANY_ID,	.subdevice	= PCI_ANY_ID,	},	{ }};MODULE_DEVICE_TABLE(pci, agp_amdk7_pci_table);static struct pci_driver agp_amdk7_pci_driver = {	.name		= "agpgart-amdk7",	.id_table	= agp_amdk7_pci_table,	.probe		= agp_amdk7_probe,	.remove		= agp_amdk7_remove,};static int __init agp_amdk7_init(void){	if (agp_off)		return -EINVAL;	return pci_register_driver(&agp_amdk7_pci_driver);}static void __exit agp_amdk7_cleanup(void){	pci_unregister_driver(&agp_amdk7_pci_driver);}module_init(agp_amdk7_init);module_exit(agp_amdk7_cleanup);MODULE_LICENSE("GPL and additional rights");