Release 4.7 drivers/char/agp/amd-k7-agp.c

/*
 * AMD K7 AGPGART routines.
 */

#include <linux/module.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/agp_backend.h>
#include <linux/page-flags.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include "agp.h"


#define AMD_MMBASE_BAR	1

#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;

	set_memory_uc((unsigned long)page_map->real, 1);
	page_map->remapped = page_map->real;

	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;
}

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arjan van de ven
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static void amd_free_page_map(struct amd_page_map *page_map)
{
	set_memory_wb((unsigned long)page_map->real, 1);
	free_page((unsigned long) page_map->real);
}

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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;
}

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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 = kzalloc((nr_tables + 1) * sizeof(struct amd_page_map *),GFP_KERNEL);
	if (tables == NULL)
		return -ENOMEM;

	for (i = 0; i < nr_tables; i++) {
		entry = kzalloc(sizeof(struct amd_page_map), GFP_KERNEL);
		tables[i] = entry;
		if (entry == NULL) {
			retval = -ENOMEM;
			break;
		}
		retval = amd_create_page_map(entry);
		if (retval != 0)
			break;
	}
	amd_irongate_private.num_tables = i;
	amd_irongate_private.gatt_pages = tables;

	if (retval != 0)
		amd_free_gatt_pages();

	return retval;
}

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/* Since we don't need contiguous 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 __iomem *cur_gatt;
	unsigned long addr;
	int retval;
	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_phys(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
         */

	addr = pci_bus_address(agp_bridge->dev, AGP_APERTURE_BAR);
	agp_bridge->gart_bus_addr = addr;

	/* Calculate the agp offset */
	for (i = 0; i < value->num_entries / 1024; i++, addr += 0x00400000) {
		writel(virt_to_phys(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. */
	}

	for (i = 0; i < value->num_entries; 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. */
	}

	return 0;
}

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bjorn helgaas
bjorn helgaas
4
1.48%
1
10.00%
david woodhouse
david woodhouse
2
0.74%
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muli ben-yehuda
muli ben-yehuda
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0.74%
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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;
}

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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;
}

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static int amd_irongate_configure(void)
{
	struct aper_size_info_lvl2 *current_size;
	phys_addr_t reg;
	u32 temp;
	u16 enable_reg;

	current_size = A_SIZE_LVL2(agp_bridge->current_size);

	if (!amd_irongate_private.registers) {
		/* Get the memory mapped registers */
		reg = pci_resource_start(agp_bridge->dev, AMD_MMBASE_BAR);
		amd_irongate_private.registers = (volatile u8 __iomem *) ioremap(reg, 4096);
		if (!amd_irongate_private.registers)
			return -ENOMEM;
	}

	/* 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;
}

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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);
}

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/*
 * 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 efficient, 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. */
}

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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 != mem->type ||
	    agp_bridge->driver->agp_type_to_mask_type(agp_bridge, type))
		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) {
		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,
					       page_to_phys(mem->pages[i]),
					       mem->type),
		       cur_gatt+GET_GATT_OFF(addr));
		readl(cur_gatt+GET_GATT_OFF(addr));	/* PCI Posting. */
	}
	amd_irongate_tlbflush(mem);
	return 0;
}

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bjorn helgaas
bjorn helgaas
6
2.35%
1
7.14%
david woodhouse
david woodhouse
3
1.18%
1
7.14%
joe perches
joe perches
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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 != mem->type ||
	    agp_bridge->driver->agp_type_to_mask_type(agp_bridge, type))
		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;
}

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static const 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 const struct gatt_mask amd_irongate_masks[] =
{
	{.mask = 1, .type = 0}
};


static const struct agp_bridge_driver amd_irongate_driver = {
	.owner			= THIS_MODULE,
	.aperture_sizes		= amd_irongate_sizes,
	.size_type		= LVL2_APER_SIZE,
	.num_aperture_sizes	= 7,
	.needs_scratch_page	= true,
	.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_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 amd_agp_device_ids[] =
{
	{
		.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 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;
	dev_info(&pdev->dev, "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) {
		struct pci_dev *gfxcard=NULL;

		cap_ptr = 0;
		while (!cap_ptr) {
			gfxcard = pci_get_class(PCI_CLASS_DISPLAY_VGA<<8, gfxcard);
			if (!gfxcard) {
				dev_info(&pdev->dev, "no AGP VGA controller\n");
				return -ENODEV;
			}
			cap_ptr = pci_find_capability(gfxcard, PCI_CAP_ID_AGP);
		}

		/* 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;
			dev_info(&pdev->dev, "AMD 751 chipset with NVidia GeForce; forcing 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) {
		if (pdev->revision == 0x10 || pdev->revision == 0x11) {
			agp_bridge->flags = AGP_ERRATA_FASTWRITES;
			agp_bridge->flags |= AGP_ERRATA_SBA;
			agp_bridge->flags |= AGP_ERRATA_1X;
			dev_info(&pdev->dev, "AMD 761 chipset with errata; 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);
}

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static void agp_amdk7_remove(struct pci_dev *pdev)
{
	struct agp_bridge_data *bridge = pci_get_drvdata(pdev);

	agp_remove_bridge(bridge);
	agp_put_bridge(bridge);
}

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#ifdef CONFIG_PM



static int agp_amdk7_suspend(struct pci_dev *pdev, pm_message_t state)
{
	pci_save_state(pdev);
	pci_set_power_state(pdev, pci_choose_state(pdev, state));

	return 0;
}

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static int agp_amdk7_resume(struct pci_dev *pdev)
{
	pci_set_power_state(pdev, PCI_D0);
	pci_restore_state(pdev);

	return amd_irongate_driver.configure();
}

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#endif /* CONFIG_PM */

/* 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,
#ifdef CONFIG_PM
	.suspend	= agp_amdk7_suspend,
	.resume		= agp_amdk7_resume,
#endif
};



static int __init agp_amdk7_init(void)
{
	if (agp_off)
		return -EINVAL;
	return pci_register_driver(&agp_amdk7_pci_driver);
}

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static void __exit agp_amdk7_cleanup(void)
{
	pci_unregister_driver(&agp_amdk7_pci_driver);
}

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module_init(agp_amdk7_init);

module_exit(agp_amdk7_cleanup);

MODULE_LICENSE("GPL and additional rights");
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Directory: drivers/char/agp

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